Safety Operation Regulations for High Frequency Dewatering Vibrating Screen

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The safety operating procedures of the high-frequency dewatering vibrating screen should be familiar with the process flow and equipment control of the system to ensure the standard operation and regular maintenance. The vibrating screen should be overhauled once a year, and the overall parts should be carefully inspected, and the necessary parts should be checked carefully. Achieve timely replacement. Some safety operating procedures given by the vibrating screen manufacturer, I hope it will be helpful to everyone.

Instructions for safe operation of high-frequency dewatering vibrating screen

1. Must be familiar with the use range and technical performance parameters of the equipment.

2. It is necessary to have sufficient understanding and mastery of the structure, principle and common sense of maintenance of the equipment.

3. Familiar with the process flow and equipment control of this system.

The inspection before the start-up of the high-frequency dehydration vibrating screen

1. Check the area around the equipment to ensure that no people are stranded to avoid personal injury when starting up.

2. Follow the sequence of the process system to ensure that the empty screen is started and all safety equipment is in a safe and operable state.

3. Check whether the feeding and discharging chute and the chute under the screen are unblocked.

4. Check whether the sieve plate and bead bolts are loose, and the wear of the sieve plate.

5. Check whether the V-belt and flexible sheet are intact, whether the tightness is appropriate, whether there is any damage, if any, replace it in time.

6. Check the connection of the universal joint and the connecting bolt of the transition pressure plate, and whether the rubber spring is damaged.

7. The vibrating screen must be started under no load, and the material can be fed only after the amplitude is stable.

High frequency dehydration vibrating screen

Matters needing attention in the operation of high-frequency dehydration vibrating screen

1. Pay attention to check the distribution of materials on the screen and make appropriate adjustments if necessary to ensure uniform distribution of materials on the screen.

2. Observe whether the vibration frequency and amplitude of the vibrating screen are abnormal; whether the operation is stable.

3. Check the temperature of the motor, vibration exciter, and transmission bearing seat.

4. Check the vibration damping of the rubber spring.

5. Check whether there is any abnormal noise such as collision or knocking during the operation of the vibrating screen. If it is found, it must be stopped in time.

The high-frequency dehydration vibrating screen stop precautions

1. In any case, as long as a major personal and equipment accident occurs, the equipment should be stopped before contacting the centralized control room and related positions.

2. Under normal circumstances, the sequence of the process system should be followed. The vibrating screen should be stopped under no load, and it must not be stopped with materials.

3. Pay attention to the large-amplitude swing when parking to ensure the safety of the equipment, and remember to follow the safe operation regulations of the high-frequency vibrating screen.

Safe use

1. During the installation and maintenance of the exciter, there must be no hard knocks or other phenomena, to ensure that the original supporting use of the bearing is not interchangeable; the thickness and quantity of the eccentric block or counterweight plate attached to the eccentric block must be the same, and the radial direction of the bearing The clearance should be C3 level.

2. The connection of the universal joint and the exciters on both sides must be concentric, the eccentric blocks on both sides are in the free plumb position, the universal joint connecting bolts can pass through smoothly; if there is deviation during installation, check the universal joint Whether the joints at both ends are concentric, do not swing the angle of the eccentric block for installation.

3. The vibrating screen should be installed with springs with the same stiffness. The spring stiffness on both sides of the feeding end and the discharging end should be as consistent as possible, and the allowable height difference should not exceed 3mm.

4. Both sides of the support seat of the rubber spring of the vibrating screen should be in the same horizontal plane with an error between 2-4mm to ensure that the material on the screen advances evenly.

5. The safety operation regulations of high-frequency vibrating screen emphasize that after replacing the transmission belt, it is necessary to recheck whether the outer end surfaces of the two pulleys are in the same horizontal plane.

6. When using electric welding to install or disassemble parts, the ground wire must be directly fixed to the welded workpiece, and as close as possible to the welding point, and the welding current must not pass through any bearings or joints.

7. In principle, the safety operating procedures of high-frequency vibrating screens are not allowed to be welded on the side plates. If the components need to be connected according to the current environment, they should be connected with bolts after drilling holes on the side plates.

8. After the overhaul is completed or the electrical components are replaced, the steering must be checked to ensure the safe use and operation of the vibrating screen.

9. After the equipment is overhauled, the exciter must be turned by hand, and the main shaft should rotate flexibly without friction and jamming.

10. Under normal operating conditions, the bearing temperature should not exceed 45 degrees.

11. The over-resonance amplitude of the vibrating screen when it is started and stopped is 5 times the normal, and should not exceed 8 times no matter how large it is.

12. The universal coupling must be concentric, and a protective device must be installed to prevent breakage and injury.

Daily maintenance

1. Regularly check the connection parts of each bolt. It must be firm and reliable, and all bolts must not be loose.

2. Regularly check the wear and tear of the sieve plate.

3. Check the side plates and beams of the vibrating screen once a month.

4. Regularly check rubber springs, V-belts, flexible connecting pieces and universal couplings.

5. Lubricate each lubrication point and replace lubricating oil according to equipment requirements.

6. The vibrator is overhauled once a year, all the vibrators are removed for cleaning and oil change, the bearings are carefully checked individually, and can be replaced if necessary, and the safe operating procedures of the high-frequency vibrating screen are memorized to avoid unnecessary economic losses. .

How to improve the screening efficiency of the vibrating screen?

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Vibrating screens are used in the production process of mining, chemical, metallurgical and other industries. It is a sorting and grading equipment. The screening efficiency of a vibrating screen refers to the ratio of the product under the screen to the total amount of selected materials. The factors that affect the screening efficiency of the vibrating screen include material characteristics, structural parameters of the vibrating screen, and motion parameters. After understanding these influencing factors, you can learn from these On the aspect of how to improve the screening efficiency of the vibrating screen, this issue is analyzed.

1. Reasonable choice of vibrating screen

In order to improve the screening efficiency of the vibrating screen, the vibrating screen should be selected reasonably according to the needs of the site. Different types of vibrating screens have different adaptability to the materials entering the screen, and the forms of screening movement of materials on different types of vibrating screens are also different. The material is vibrated on the vibrating screen surface in a direction approximately parallel to the screen surface, and the screening effect increases as the vibration frequency of the vibrating screen increases. Therefore, when selecting a vibrating screen, a comprehensive analysis of various factors such as on-site material characteristics and target products should be carried out, and a reasonable vibrating screen should be selected to maximize the screening effect.

At the same time, on the premise of meeting the product particle size requirements, try to choose a non-metallic sieve surface with a large sieve size and a high opening rate, and choose an appropriate sieve to improve the screening effect of the material. At the same time, when selecting the screen surface, it is necessary to satisfy that the screen surface has a reasonable aspect ratio, which can improve the efficiency of the vibrating screen without affecting the screening capacity.

2. Adjust the feeding mode

If the feed is insufficient during the screening process, the ore will be unevenly distributed on the screen; if the feed is too much, the screen will be too thick, resulting in large production, blocking the screen and reducing output. For the problem of uneven feeding, a distributor can be installed at the feeding port to evenly distribute the material on the surface of the screen to meet the requirements of improving output. Distributors can be installed to ensure uniform feeding. If the distributor is added unconditionally, care should be taken when manual feeding is required to ensure uniform feeding. Feeding must be carried out along the entire width of the screen to make full use of the screen surface.

3. Reasonably select the vibration motor and adjust the excitation force

Arc vibrating screen

(1) Reasonable choice of vibration motor

As the vibration source of the vibrating screen, the motor is closely related to the working performance, movement mode and screening effect of the vibrating screen. When choosing a vibrating screen motor, choose a motor with a relatively simple structure, high vibration excitation efficiency, and easy maintenance. Increasing the excitation force of the motor can increase the amplitude of the screen surface, accelerate the movement of the material, and reduce the blocking rate of the screen hole.

(2) Adjust the exciting force

Exciting force and material penetration rate and crushing rate show wavy changes to a certain extent, so the exciting force can be adjusted appropriately within a certain range, but the setting value of the exciting force must be within the range of the motor’s synthetic exciting force , Otherwise it is easy to cause material bounce and motor damage. Various measures should be taken when adjusting the excitation force.

4. Improve the movement of the screen surface

The movement mode of the screen surface has a great influence on the working efficiency of the vibrating screen. The ideal way of sieve surface movement is:

(1) The vertical amplitude at the feed end of the screen surface should be greater than the vertical amplitude at the discharge end. This is because the large vertical amplitude at the feed end can effectively stratify the thicker materials at this end, and at the same time, with the help of the inclination angle, the excess material at this end is quickly spread to the middle of the screen surface, so that the fine-grained materials are relatively thinner. The material layer is stratified through the screen, thereby improving the actual use efficiency of the screen surface; when the material reaches the discharge end, the material has been separated into layers, then only a small vertical amplitude is required to ensure the fine-grained material There are good penetrating conditions, but too large vertical amplitude disturbs the penetrating environment of fine-grained materials.

(2) Along the length of the screen surface, starting from the feeding end, the moving speed of the material should be in a decreasing state. This is because the moving speed of the material is decreasing, so that the material layer can maintain a certain thickness on the entire screen surface, so that the fine-grained material can be layered through the screen on a relatively longer range of screen surface, increasing the actual use area of ​​the screen, and at the same time, The amount of penetration of the screen surface along the length of the screen tends to be uniform, giving full play to the screen surface’s penetration potential.

High frequency dehydration vibrating screen

5. Reasonable design of vibration parameters

According to the different materials, the vibration parameters of the vibrating screen are reasonably designed to appropriately improve the throwing degree of the vibrating screen. For materials with larger particles, high-amplitude, low-frequency vibrating screens can be used, and for fine-grained materials, small-amplitude, high-frequency vibrating screens can be used. Under the premise of meeting the screening effect, the vibration direction angle of the vibrating screen can be reduced accordingly. , Appropriately increase the inclination angle of the vibrating screen surface, which is beneficial to improve the efficiency of material screening.

6. The use of non-metallic material screen

The use of a thin elastic screen as the screen base is very beneficial to improve the working efficiency of the vibrating screen. This kind of screen is generally made of rubber or polyurethane material. It can reduce the adhesion between the screen surface and the material being screened, cause the material to produce secondary high-frequency vibration, avoid the blockage of the screen hole, and enhance the permeability of the material. It can alleviate the mechanical effect of the material to be screened on the screen surface, and can withstand greater amplitude vibration than a steel wire screen.

The above is the answer to how to improve the screening efficiency of the vibrating screen, which can be improved by reasonable selection of the vibrating screen, adjustment of the feed mode, reasonable selection of the vibrating motor and adjustment of the exciting force. Improving the screening efficiency of the vibrating screen is conducive to improving the overall production yield, and also has an important impact on subsequent operations.

Five processes of vibrating screen in coal preparation operations

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In recent years, with the improvement of the level of science and technology, people’s demand for goods has become more and more refined, and the quality has become higher and higher. The technology of vibrating screens also has higher requirements in the manufacturing industry. At the same time, with the development of the national economy, the screen Sub-technology and equipment are becoming more and more widely used in various industries.

Five processes of vibrating screen in coal preparation operations

In coal preparation operations, most of the vibrating screens are used to classify or dehydrate items. At the same time, in order to improve the accuracy of items, vibrating screens are often used to classify their items. In the coal industry, the role of vibrating screens is not only to classify, most of the vibrating screens are also used for dewatering or de-intermediation of coal, and even for desilting. In the coal preparation plant’s screening operations, raw coal preparation and product processing, it is mainly divided into five categories.

1. Prepare for sieving

Also called pre-screening. In the coal preparation plant, according to the requirements of the crushing operation and the sorting operation, the raw coal is screened into different particle sizes to prepare for the further work of the coal.

Arc vibrating screen

2. Dewatering and screening

Screening for the purpose of dehydration is used in the coal preparation plant for the dehydration of the processed products. The sieve used for the dehydration operation is called a dehydration sieve.

3. Desliming and screening

Screening for the purpose of removing slime. Desliming and screening is the operation of coal preparation plant in order to reduce the pollution of high ash fine sludge to clean coal. In the process of dewatering on the sieve, water jet washing is strengthened to remove part of the fine sludge. Desliming and screening are mostly used in heavy-medium coal preparation plants. In order to reduce the pollution of coal slime to the media system, desliming and screening should be used before coal enters the heavy-medium separator.

4. Screening for the purpose of removing heavy media

It is also called de-intermediate screening. It is a de-intermediate operation in which the product of heavy-medium coal preparation is sprayed with strong clean water on the sieve to separate the product from the heavier mass.

5. Slime recovery

It is screened for the purpose of recovering coal slime and used for dewatering of coal slime and tailings in coal preparation plants.

What is the reason for the incomplete dehydration of the high-frequency dehydration vibrating screen?

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As the name implies, the high-frequency dehydration vibrating screen can reduce the moisture in the material. Generally, it is widely used in the mining sand and gravel industry. The cleaned sand is then sent to the dewatering screen for secondary dehydration, which can reduce the mud content in the sand to the specified level. Degree. At present, it has good applicability for the screening and dehydration of fine sand, and it also plays an indispensable role. But if the high-frequency dewatering vibrating screen is not completely dehydrated, it must be reworked and will increase the screening workload. So what is the reason for the incomplete dewatering of the high-frequency dewatering vibrating screen? The following experienced vibrating screen manufacturers will answer this question for everyone.

Reasons for incomplete dehydration of high-frequency dehydration vibrating screen

High frequency dehydration vibrating screen

1. The reason for the screen

The dewatering screen is not tightened, and the transmission belt is too loose. The above two conditions are likely to cause incomplete dewatering, which is not conducive to the normal progress of the screening operation, and then affects the dewatering quality. In addition, the blockage of the sieve on the screen causes excessive load. More, it will also cause incomplete dehydration.

Solution: The screen should be tightened, and the transmission belt should be tightened; the screen surface should be cleaned in time.

2. The material layer on the screen is too thick

The over-thick material layer on the screen surface may be due to too much feed, or the above-mentioned sieve hole is blocked, which will cause the feed layer to be too thick, and then the dewatering screen will not work, so this is also the reason for the incomplete dewatering One. Greatly reduce the working efficiency of the screen machine.

Solution: Reduce the feed of the dewatering screen.

3. Reasons for material size

The vibrating dewatering screen material with a particle size smaller than 3/4 of the mesh size is easy to steal through the sieve, and is called easy sieve; the particle is larger than 3/4 of the sieve, and it is difficult to pass through the sieve. It is used for the special slurry dehydration of coal water slurry. The effect of the sieve is called particles that are difficult to sizing; particles with a particle size of 1-1.5 times the mesh size are called particles.

Solution: Screening contains a large number of finer materials of finer grades, and auxiliary screening methods can be added. The auxiliary sieve with a larger mesh size is used to pre-screen the grade of the product on the sieve. When used for the screening, dewatering and de-intermediation of finer materials, the equipment length of the screening machine is generally 5.6-7m, and the length ratio is about 3.

4. Uneven feeding of the sieve machine

Uneven feed will not only cause material accumulation and breakage, but too little feed will greatly reduce production efficiency, and too much accumulation will easily cause poor screening quality, and even cause equipment operation failure if it is serious.

Solution: The feeding of the screen machine should be adjusted to ensure uniform feeding.

5. Other reasons

(1) The horizontal level of the dewatering screen box is correct. Solution: adjust the height of the support; change the inclination angle of the screen box to increase the inclination angle;

(2) The steel support spring of the dewatering screen is too large or damaged. Solution: Adjust or replace the dewatering screen spring.

Precautions for the use of high-frequency dehydration vibrating screen

Arc vibrating screen

1. Pay attention to the smoothness of the bearing during the operation of the vibration motor of the dewatering screen. Under normal operating conditions, the accumulated operation time is about 1600 hours, the bearing grease should be replaced and the bearing, bearing chamber, and bearing gland should be cleaned.

2. After the dewatering screen is suspended or stored for more than half a year, the motor should be disassembled for maintenance and replaced with lubricating grease.

3. After the accumulated operation time of the dewatering screen exceeds 5000 hours, the motor bearing should be checked. If it is damaged, a new bearing should be replaced.

4. After the dewatering screen has been parked for half a year or for a long period of time, the insulation resistance of the motor stator coil to the ground should be measured before use. When measuring with a 500V megohmmeter, the insulation resistance should be no less than 20 megohms.

The above answers the question of what is the reason for the incomplete dehydration of the high-frequency dehydration vibrating screen. I hope it can be helpful to everyone. If there is a problem of incomplete dehydration during actual use, you can follow the reasons and solutions mentioned above. For inspection, if you really don’t know, you can contact the vibrating screen manufacturer purchased at that time for after-sales service.

What are the materials of the vibrating screen? Which material is better?

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As an important screening component of the vibrating screen, the screen is in direct contact with the material during the screening process, so the screen is the main vulnerable part in the vibrating screen system. Once the material is selected incorrectly, it is very easy to cause the screen to be worn and damaged, which affects normal production and increases the production cost. Therefore, if you want to choose the right vibrating screen, you must first understand the materials of the commonly used vibrating screens.

The material of the vibrating screen

1. Stainless steel screen

Stainless steel screen materials are mainly 201, 201, 302, 304, 304L, 316, etc., which have good acid resistance, alkali resistance, and rust resistance; high strength, tensile strength, toughness and wear resistance, durability, and high temperature oxidation resistance. , 304 stainless steel screen with a nominal temperature of 800 ℃, 310S stainless steel screen with a nominal temperature of 1150 ℃; normal temperature processing, that is, easy plastic processing, making the use of stainless steel screen diversified; high finish, no surface It is convenient and simple to handle and maintain. Stainless steel screens are often used for screening and filtering under acid and alkali environmental conditions, as well as mud screens in the petroleum industry, and screens in the chemical and chemical fiber industries.

2. High manganese steel screen

Among many materials, the quality of high manganese steel screen is relatively reliable. It is a kind of screen product woven by manganese steel mesh wire with a diameter of 1.6mm-12mm. It adopts embedded weaving method. The overlapping point of warp and weft is not prominent. The screen surface is flat and the force is even. Plasticity and toughness can achieve better results, while the service life is more guaranteed. High manganese steel has high strength, rigidity and bearing capacity. When subjected to strong impact and friction, the surface will produce strong work hardening due to plastic deformation, and the surface hardness can be increased to above HRC60, thereby obtaining high wear resistance. , While the interior still maintains high plasticity and toughness. In addition, when the old surface is worn out, the new surface will form a wear-resistant layer, so the service life can reach 4-8 times that of ordinary screens. It is mostly used in large-scale mining industries. It can also be used as a protective screen for mechanical vibrating screens, Drum screen machine, electromagnetic high frequency screen machine and asphalt mixing machine, etc.

3. Punching screen

Punching screen refers to the screen that uses a punch to punch out the target pattern in the plate to be processed. Generally, it is made of stainless steel, aluminum plate, cold and hot steel plate, copper plate, PVC film and other materials. The hole type is more selective and has long Holes, square holes, round holes, hexagonal holes, scale holes, stretched shaped holes, etc. Perforated screens have the characteristics of light weight, non-slip, beautiful appearance, and good filtering performance. They are often used in environmental protection noise control barriers in traffic and municipal facilities, and mine screens, mine screens, I-shaped screens, etc.

4. Polyurethane screen

Polyurethane screens are also easier to use and have better abrasion resistance. Polyurethane itself has very high elastic modulus, high strength and impact absorption, high wear resistance, and high tensile strength, so its bearing capacity is relatively high. It is more than 2.5 times that of rubber sieve plates, and its service life is 8-10 times longer than that of ordinary metal sieve plates, 3 times that of stainless steel screens, and 3.9 times that of natural rubber. It is the current screen material with better wear resistance. . The production material of the polyurethane screen is a polymer organic elastomer, which has excellent abrasion resistance, flexibility resistance, and large load-bearing capacity. It has been specially treated to ensure that it will never delaminate under long-term alternating loads.

5. Carbon steel screen

Vibrating screens made of carbon steel are rare. Although they are low in cost and have a certain degree of corrosion resistance, they have poor wear resistance and are not more stable than stainless steel and non-metallic materials. The amount of nickel is low, the material is hard, and it is easy to break, causing the screen of the vibrating screen to be damaged too quickly, so the application is relatively small.

The choice of vibrating screen

Arc vibrating screen

1. Choose according to materials

First of all, you must clarify what material you are sieving, and when you buy a vibrating screen. Then, according to the size of the sieved material particles, we can choose the sieve that can meet my needs for sieving. Describe the technical parameters of the screen mesh, wire diameter, aperture, diameter, material, effective screen surface, etc. The length unit is usually millimeters as the standard.

2. Choose according to the material

The material of several vibrating screens is introduced above, and the characteristics of each material are also explained in detail. Among the metal materials, the high-manganese steel screen is the better quality, but the cost is relatively high. Among non-metallic materials, polyurethane screens are the one that is easier to use.

3. Choose according to wear resistance

After clarifying the materials to be screened, look at the wear resistance of the screen. Because the materials screened by the mine vibrating screen often have higher strength, or in some chemical industries, the screened materials are corrosive, so the screen of the vibrating screen is required to have a certain degree of wear resistance, otherwise the screen Prone to breakage and high wear rate.

4. Choose according to the opening rate

The opening rate refers to the ratio of the area occupied by the screen holes to the area occupied by the screen surface. The larger the effective screening area, the greater the productivity per unit area of ​​the screen surface and the higher the screening efficiency; the opening rate of the screen surface It is an important parameter to measure the quality of the screen surface; it should be considered not to reduce the strength of the screen surface and significantly shorten the service life of the screen surface; the screen surface of the vibrating screen is evenly distributed with holes of a certain size and shape, which are commonly called sieve holes. ; When sieving materials on the screen surface, the materials passing through the sieve holes are called under-screen products, and the materials remaining on the screen surface are called over-screen products.

The installation steps of the vibrating screen

High frequency dehydration vibrating screen

1. Screen selection: Select the screen with the same mesh number. This is important. If the mesh number of the screen does not match, it will directly affect the accuracy and output of the screened materials;

2. Laying the screen: When installing the screen, the screen should be laid flat on the pallet, and the screen should be flattened as much as possible (but not too strong, otherwise it will affect the life and accuracy of the screen), and then use the fastening device to The screen is fixed on the net frame. Here to explain: Generally, the three-dimensional rotary vibrating screen frame is a letter grid frame. The screen mesh can be pressed on the mother mesh frame by a fastening device. The ultrasonic vibrating screen mesh is directly glued to the mesh frame, and only needs to be tightened and pasted during installation;

3. Fastening: After the screen is fastened to the mother frame, check whether the surrounding screens are all compressed on the mother frame. If slack is found, it should be adjusted reasonably;

4. Debugging: After the linear vibrating screen is installed, a little material should be used to test the cloth and screening of the screen. If the material is transported uniformly, and the classification is accurate, there is no mixing phenomenon, then it can be put into use; On the contrary, if there is unevenness such as deviation or accumulation, the flatness and uniformity of the screen surface of the screen should be adjusted; if there is a mixing phenomenon, the sealing of the linear vibrating screen and whether it is compressed should be checked.

The installation precautions of the vibrating screen

1. Note that you must choose a screen with a thicker wire diameter, because the installation of a linear screen is relatively cumbersome.

2. When cutting, the screen width should be the same as the net frame, and the length must be 50~70mm longer than the net frame.

3. When installing, the screen must be tensioned, because the tension of the screen is an important factor affecting the screening efficiency.

4. When installing the clear net pinball, you must pay attention to the difficulty of screening the material and the number of meshes, and it cannot be installed blindly.

5. If the specific gravity of the material is large or the mesh number of the screen is high, a suitable support mesh should be added under the screen. The purpose is to play a supporting role, reduce the pressure of the material on the screen, and prolong its service life. .

6. After the mesh frame is assembled to the screen box as required, remember to extend the grown screen into the corresponding outlet to avoid mixing.

7. When installing the pressure plate, be sure to pay attention to its flatness, and line it with a more flexible sponge sealing tape to evenly lock it, because this is the key to preventing mixing and an important factor that affects the service life of the screen.

The above is the introduction to the material of the vibrating screen. The material of the vibrating screen is a point that many users focus on when choosing a vibrating screen. When choosing a screen, it must be based on the characteristics of the material. The screen is wear-resistant. The combination of performance and opening rate is selected, so that the vibrating screen can also have a higher screening efficiency.

What are the process parameters of the vibrating screen? How to calculate?

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The vibrating screen generally has a harsh working environment, such as high temperature and high dust. In order to maintain the normal operation of the vibrating screen under this condition, it puts forward higher requirements on the process parameters of the vibrating screen. The process parameters of the vibrating screen are What? How to choose and calculate these parameters? All we need to understand. Reasonable process parameters can also ensure the normal operation of the vibrating screen, and in some respects also extend the service life of the screen.

Process parameters of vibrating screen

1. The inclination angle of the vibrating screen

The inclination angle of the screen surface refers to the angle between the screen surface of the vibrating screen and the horizontal line. The size of the inclination angle will affect the moving speed of the material on the drying surface. When the inclination angle of the screen surface is too large, the moving speed of the material will also increase. Although it can increase the production volume, it will reduce the screening efficiency. On the contrary, if the inclination angle is too small, the screening efficiency will be increased, but the production capacity will be reduced. Linear screens are generally installed horizontally with a zero inclination angle. Horizontal linear screens are generally only suitable for the screening of materials with a particle size of 40mm or less, or for the dehydration, desliming and removal of coal. If it is used for screening materials with a particle size of 50mm or more, the linear screen should have an angle, and the inclination angle is about 5º~10º.

2. Vibrating screen amplitude and frequency

Vibrating screen amplitude refers to the range and intensity of the box vibration, and frequency refers to the number of vibrations per minute of the screen box. When the amplitude is larger, the frequency of screening is higher, and the movement speed and acceleration of the screen box are also greater. When sieving coarse particles, it is recommended to adopt a larger amplitude and a lower frequency; conversely, when sieving fine particles, a smaller amplitude and a higher frequency should be maintained.

3. The length and width of the vibrating screen

When the other conditions of screening are the same, the productivity mainly depends on the width of the screen surface, and the screening efficiency is mainly determined by the length of the screen surface. But it does not mean that the width of the screen surface is as wide as possible, because when the screen surface is too wide, the feeding will be uneven and the rigidity will be poor. The screen surface is too long and can not increase the efficiency of screening, so the screen surface of the appropriate length and width should be selected. Therefore, the aspect ratio is generally 2:3. For the screening of coarse materials, the screen surface length is 3.5~4m. For the screening of medium and fine-grained materials, the screen surface length is 5~6m; the pre-screened screen surface can be shorter than the final screen surface It should be longer.

4. Throwing angle of vibrating screen

The throw angle of the vibrating screen refers to the angle formed between the direction of the box body and the screen surface when the box is moving, that is, the direction angle that the material on the screen surface is thrown by force. The larger the throwing angle, the slower the material movement speed, which will be adequately screened, which is suitable for difficult-to-screen materials. The smaller the projection angle, the faster the material movement speed, which is suitable for easy-to-screen materials.

Selection and calculation of vibrating screen parameters

1. Throwing index

According to experience, depending on the nature of the material to be processed, the theory and production practice for sieving have proved that the particle size is less than 3/4 of the mesh size, called “easy sieve”; the particle size is larger than the mesh size 3/ 4, called “difficult to sieve granules”; the closer the diameter of the granules is to the sieve size, the more difficult it is to penetrate the sieve. Most use medium-speed throwing index 1.75-3.3.

2. Installation inclination

The installation inclination angle is related to the processing capacity and screening efficiency of the vibrating screen.

(1) Material classification and separation, etc.: Installation angle=0°;

(2) Linear vibrating screen: dewatering: installation angle = 0°, negative if necessary; when the material is above 50 mm, the installation angle = 5~10°; when the material is below 40 mm: installation angle = 0°; For mud, de-intermediation, and dehydration: Installation angle = -5°~0°.

High frequency dehydration vibrating screen

3. Installation vibration direction angle

The value of linear vibrating screen is 30~60°, for linear vibrating screen, generally β=45°. The reason is that it has good adaptability, high movement speed and high productivity.

4. The length and width of the screen surface

Calculate the required area according to the actual production use of the sieve, productivity, and the particle size of the material to be screened. If it is a multi-layer screen, it should be calculated layer by layer, and the calculated peak value should be taken, and it should be rounded according to the standard.

(1) The length of the screen surface: below 3.6mm, the interval of each stage is 0.6m; above 3.6mm, the interval of each stage is 0.9m;

(2) Screen width: below 3.0mm, the interval of each step is 0.3m; above 3.0mm, the interval of each step is 0.6m.

5. Vibration tilt angle

The vibration tilt angle is usually 45°, and the tilt angle can be as high as 60° for some difficult-to-screen materials such as crushed stone, coke, and sinter.

6. The moving speed of the screen surface and the thickness of the material layer

The moving speed of the material along the screen surface is usually 0.12~0.4m/s, not more than 1.2m/s. For a circular vibrating screen, the moving speed of the material along the screen surface is related to the inclination angle of the screen surface. The relationship between the thickness δ of the material layer and the sieve size a is shown on the right: δ≤(3~4)a; the relationship between the thickness and the average particle size d0 of the material on the screen is shown on the right: δ≈(2~2.5)d0.

7. Vibrating screen amplitude and spindle speed

The amplitude is generally between 2~8mm. When the sieve is small or used for dehydration, take the small value. When the sieve hole is larger, choose a larger value. For the spindle speed, it can be calculated as follows:

Vibrating screen amplitude and spindle speed

A is the amplitude (mm); n is the spindle speed (n/min)

The above content summarizes what the process parameters of the vibrating screen are, such as the inclination of the screen surface, the amplitude and frequency, the length and width of the screen surface, etc. The vibrating screen obtains the ideal use effect.

Introduction to the working principle and structure of the linear vibrating screen

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Vibrating screen is a screening equipment used in the production of coal mines, building materials and other industries. According to different trajectories, vibrating screens can be divided into linear vibrating screens, circular vibrating screens, etc. Among them, the linear vibrating screen uses a vibrating motor as the vibration source, so that the material is thrown up on the screen and moves forward in a straight line. The feeder evenly enters the feed port of the sieving machine, and the oversieve and undersieve of several specifications are produced through the multi-layer screen and discharged from their respective outlets.

1. The working principle of linear vibrating screen

The working principle of the linear vibrating screen is that the shafts of the two vibrating machines have an inclination angle relative to the screen surface. Under the combined force of the exciting force and the material’s self-gravity, the material is thrown up and jumping forward on the screen surface to move forward in a straight line, so as to achieve the material Purpose of screening and grading.

The linear vibrating screen is driven by dual vibrating motors. When the two vibrating motors rotate synchronously and in opposite directions, the exciting force generated by the eccentric blocks cancels each other in the direction parallel to the motor axis, and stacks in the direction perpendicular to the motor axis. As a result, the trajectory of the screen is a straight line.

Screening process: After a large number of broken materials with different particle sizes and mixed coarse and fine particles enter the screen surface, only a part of the particles contact the screen surface. Due to the vibration of the screen box, the material layer on the screen is loosened, so that the gaps that exist in the large particles are removed. Further expansion, small particles take the opportunity to pass through the gap, transfer to the lower layer or conveyor. Because the gap between small particles is small and large particles cannot pass through, the original disorderly arrangement of particles separates, that is, they are stratified according to particle size, forming an arrangement rule with small particles on the bottom and coarse particles on the top.

Arc vibrating screen

2. Structural composition of linear vibrating screen

Linear vibrating screen is generally composed of vibrator, screen box, support or suspension device, transmission device and other parts.

1. Vibrating screen vibrator: single-shaft vibrating screen and double-shaft vibrating screen vibrators are distinguished by eccentric reconfiguration, and there are generally two types. The block eccentric type is better for the configuration of the eccentric weight.

2. Vibrating screen box: The screen box is composed of a screen frame, a screen surface and its pressing device. The screen frame is composed of side plates and beams. The screen frame must be sufficiently rigid. Mainly used to keep the screen flat and achieve normal screening. The screen box is the main part of the vibrating screen.

3. Vibrating screen supporting device: The supporting device of the vibrating screen has two types: hanging type and seat type. The seat type installation is relatively simple, and the installation height is low. In general, the seat type should be preferred. The supporting device of the vibrating screen is mainly composed of elastic elements. Commonly used are coil springs, plate springs and rubber springs.

4. Linear sieve damping spring: prevents vibration from being transmitted to the ground, while supporting the full weight of the screen box. When installed, the spring is perpendicular to the ground.

5. Vibrating screen transmission device: Vibrating screen usually adopts a V-belt transmission device. The structure of the vibrating screen is simple. The number of revolutions of the vibrator can be selected arbitrarily. However, the belt is easy to slip during operation. It may cause the sieve to be blocked. Vibrating screens are also directly driven by couplings. The coupling can maintain a stable number of revolutions of the vibrator. And it has a long service life. However, it is difficult to adjust the number of revolutions of the vibrator.

3. The characteristics of linear vibrating screen

（1）Using block eccentricity as excitation force, strong excitation force;

（2）The screen beam and the screen box adopt high-strength bolts, with simple structure and convenient and quick maintenance;

（3）Using tire coupling, flexible connection, stable operation;

（4）The structure of small amplitude, high frequency and large inclination angle makes the machine high in screening efficiency, long life, low power consumption and low noise;

（5）The design of the screen part can quickly change the screen and tension quickly. In addition, this design allows the use of various screens, such as nylon, special dragons, PP nets, etc.;

（6）The material has a long stroke on the screen surface, high screening accuracy and large processing capacity;

（7）At the same time of sorting, long-distance transportation of materials;

（8）The spacing and inclination of the screen surface can be changed according to the material size, the probability of penetrating the screen, and the productivity;

（9）Different shapes and structures can be designed according to the production site.

The above is an introduction to the working principle and structural composition of the linear vibrating screen. It can be seen that the motion track of the linear vibrating screen is a straight line, so the material is thrown up on the screen surface and moves forward in a straight line. Under the “cooperation” of gravity, materials can be screened and classified.

Linear vibrating screen is generally composed of vibrator, screen box, support or suspension device, transmission device and other parts. The vibrating screen produced by Hiside Heavy Industries has high strength, no welds, and built-in reinforcing ribs, which reduces the weight of the whole machine, while improving the rigidity of the screen machine, which is highly efficient and energy-saving.

For more information about the linear vibrating screen, please click to visit:

What are the sieve methods of linear vibrating screen?

Instructions for use of linear vibrating screen

 

Installation steps, debugging and precautions of vibrating screen exciter

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A vibration exciter must be installed on the mine vibrating screen equipment to realize the screening of materials. The vibrating screen exciter is a device used to generate the exciting force, which can make the object to be excited obtain a certain form and magnitude of vibration, thereby vibrating the object. In addition to providing exciting force, the exciter also determines the vibration frequency and amplitude of the vibrating screen. Therefore, the correct installation of the vibration exciter is very important. Below, the editor of Hiside will talk about the installation steps and debugging of the vibrating screen exciter.

Installation steps of vibrating screen exciter

DVE4.1

1. Before installing the vibrating screen exciter, first refer to the packing list to check whether the parts are complete and damaged.

2. Refer to the installation drawing for installation. The supporting frame must be installed horizontally on the foundation. The foundation should have sufficient rigidity and strength to support all the dynamic and static loads of the vibrating screen.

3. The screen box trunnion can be used to lift the sieve machine, and the whole sieve cannot be directly hung on the exciter. Lift the exciter to the installation position, and use the bolts to locate at four points symmetrically. Install the exciter anchor bolts, and Preload.

4. When installing the vibration exciter, ensure that there is a 75mm gap between the screen box and non-moving parts such as hoppers and troughs.

5. Remove the spreader before tightening the anchor bolts, tighten the exciter anchor bolts diagonally with a torque wrench, and tighten the anchor bolts to a fixed torque.

6. Install the coupling and the protective cover, keep the eccentric block installed in a natural state, and install the vibration exciter and the coupling protective cover in turn. The installation must be firm and reliable.

7. Fill the exciter with lubricating oil, and the grease and oil level meet the requirements.

8. Clean up the scene. Count tools, materials, accessories, and debris on site. The site should be tidy and clean. Then began the debugging work of the vibrating screen exciter.

Debugging steps of vibrating screen exciter

JR608

1. The exciter must be rotated by hand (or other methods) before the test run. The machine can be started only when the rotation is flexible and there is no jamming phenomenon.

2. When debugging, adjust the excitation force, first remove the wind shield. Loosen the counterweight fastening bolts, adjust the eccentric block and counterweight of the exciter at the same phase and angle, or increase or decrease the number of counterweights, tighten the bolts, and reinstall the air hood. Adjust the size of the exciting force to meet the needs of different materials or processing capacity of various vibration equipment.

3. The exciter has no abnormal noise, no leakage, and the bearing temperature rise does not exceed 75 degrees Celsius.

4. The trajectory of the vibrating screen is a straight line, the amplitude difference of the four points is less than 2 mm, and the angle difference of the four points is less than 2 degrees.

Precautions for installation and debugging of vibrating screen exciter

DF401S

1. When hoisting the vibrating screen exciter, don’t bump it when transferring or installing it.

2. Do not disassemble parts and components at will during installation. When installing, check whether the anchor bolt holes are consistent with the bottom plate bolt holes.

3. After the seat type vibration exciter is installed, it should be horizontal horizontally and symmetrical to the center line of the screen body.

4. Turn on the machine for a short time and check whether the working direction of the exciter meets the requirements (the two shafts of the exciter should rotate in opposite directions).

5. The anchor bolts should use strength bolts and take anti-loosening measures to prevent damage to the exciter.

6. The thin oil lubrication exciter needs to open the cooler to supply oil first, check whether the oil circuit is dredged, whether there is oil leakage, and start the test run when the oil return pipe starts to return oil.

7. Do not disassemble parts at will during installation. After installation, the exciter should be horizontal.

8. The bolts connecting the exciter and the screen box are high-strength bolts, which are not allowed to be replaced by ordinary bolts. The tightness must be checked regularly and once a month. The loosening of any one of the bolts will also cause other bolts to be cut, causing damage to the screen machine.

In summary, the installation procedure of the vibrating screen exciter is to first check whether the parts are complete, then lift the exciter to the installation position, install and pre-tighten the anchor bolts, and tighten the anchor bolts to a fixed specified torque. Add lubricating oil. Because of the exciting force of the vibrator, the vibrating screen can run smoothly without swinging and twisting, and produce low noise.

What happens to the uneven feeding of the vibrating screen? Affect screening efficiency

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When using a vibrating screen to screen materials, we have repeatedly warned users and friends that the feeding should be uniform. Many users and friends may disagree, thinking that no matter what feeding method, the material will enter the equipment anyway, so we ignore the feeding problem. The idea is actually wrong. The uniformity of feeding has a great influence on the screening work of the vibrating screen. What happens to the uneven feeding of the vibrating screen? Next, the editor of Hiside will talk to everyone about the impact of uneven feeding.

The impact of uneven feeding of vibrating screen

Banana screen

1. Affect the service life of the screen

If the vibrating screen is fed unevenly, the screen will be damaged quickly and reduce the service life of the screen. Because if the feeding is uneven, there may be too much material at one time, which will exceed the working pressure that the screen can withstand, and the screen will also be weighed because of the weight of too much material, which will cause The screen surface is damaged faster.

2. Affect the output and accuracy

The uneven feeding of the vibrating screen will also affect the output and screening accuracy, which is also caused by the previous effect. Because the screen is damaged, the screen must be replaced, which in turn affects the output and screening accuracy. If this is the case for a long time, it will not only affect normal production but also increase equipment maintenance costs.

Another aspect that affects output and accuracy is reflected in the fact that when the feeding is uneven, there will be a phenomenon that there is material on one side of the screen surface and the other side is not. This will reduce the utilization rate of the overall screen surface and cause the output to fail to meet the requirements. . On the other hand, due to uneven feeding, it will be a problem of excessive accumulation of materials on one side. Once the accumulation of materials is too thick, it will affect the screening accuracy and output.

3. Affect the service life of the motor

When the vibrating screen is used, the uneven feeding or excessive feeding at one time in the production process will increase the load of the screen and the load of the motor, which will damage the vibrating motor and reduce the service life of the motor. Users are required to continuously maintain or replace the motors to increase equipment maintenance costs.

4. Affect the efficiency of screening

When using the vibrating screen, the uneven feeding will also affect the screening efficiency. If too much material is fed at a time, the screening load that the vibrating screen can bear will be exceeded, causing the material to be discharged from the discharge port before it has time to be screened, resulting in overfeeding. Too much fine material is discharged from the coarse material port, which will greatly reduce the screening efficiency.

The method of uniform feeding of vibrating screen

Arc vibrating screen

1. First, choose a reliable screen when choosing a vibrating screen.

2. Frequently check the tension of the screen surface and check whether the screen is compacted.

3. When there is strong impact force, a hopper or buffer can be added to the vibrating screen.

4. If there is material accumulation, find out the reason as soon as possible, such as adjusting the eccentric block of the vibration motor.

5. Carefully read the instruction manual of the ultrasonic vibrating screen, and feed the material strictly according to the processing capacity of the screen. If you need to increase the production capacity, you can find the vibrating screen manufacturer to further modify the screen machine.

6. The use of an automatic feeding system, that is, spiral feeding or bucket lifting, belts and other lifting and conveying devices for automatic feeding, not only solves the consequences of uneven feeding, but also improves the cost of the workshop.

The precautions of vibrating screen feeding

High frequency dehydration vibrating screen

1. Avoid too much feeding at one time

When feeding the vibrating screen, care should be taken to avoid excessive feeding at one time. A large amount of one-time feeding that exceeds the carrying capacity of the screen will cause the screen to become fatigued and loose, and severely damage the screen and affect the screening effect. When the vibrating screen is shipped from the factory, the vibrating motor and screen are matched according to user requirements. For example, one-time feeding will increase the load of the vibrating motor and reduce the life of the vibrating motor. The screening efficiency of the screen will also be greatly reduced.

2. Avoid large impact when feeding

Avoid large impact when feeding. This is also what the vibrating screen should pay attention to when feeding. The impact force of the one-time feeding will seriously affect the tension of the screen, and the loosening of the screen will affect the screening efficiency. Relatively, it will seriously affect the life of the screen plate. It is recommended to communicate clearly with the vibrating screen manufacturer when ordering a vibrating screen. A buffer hopper can be installed if the impact force of the feed is large.

The above is the answer about the uneven feeding of the vibrating screen. It can be seen that the uneven feeding will affect the service life of the vibrating screen, causing rapid damage to the screen, which in turn reduces the output and screening accuracy, and affects the service life of the motor. Affect the screening efficiency. These effects will increase the maintenance cost of the equipment, which is not conducive to stable production. Therefore, uniform feeding is very important. When feeding, it is necessary to avoid excessive investment or high impact at one time. If you need high-quality vibrating screen equipment such as banana vibrating screen and linear vibrating screen, please contact Hiside for detailed inquiry~

 

How to extend the service life of the vibrating screen?

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In the mining industry, the work task of the vibrating screen is still very important. It is necessary to screen the materials on the entire production line, and its processing capacity is large, and the screening effect is good. It is also indispensable screening equipment in many other industries. When we use vibrating screen equipment, of course we hope that the equipment can be used for a long time. This is also inseparable from the service life of the equipment, so how to extend the service life of the vibrating screen? Below, the vibrating screen manufacturer gave us the following specific introduction on how to extend the service life of the vibrating screen.

1. Install the vibrating screen correctly

The correct installation of the vibrating screen will help to extend the service life of the equipment. Before, we also specifically talked about how to install and debug the vibrating screen. One of the more important is the installation of the vibration motor. Heavier eccentric blocks are installed at both ends of the vibrating motor. During operation, we can control the excitation force by adjusting the number of eccentric blocks of the vibrating screen. However, due to the heavier eccentric blocks, such as vertical or inclined installation, The bearing has to bear the weight of the eccentric block in the axial direction, which will greatly affect the service life of the bearing. Therefore, when we do not require it, we generally recommend to choose a vertical vibration motor and try to avoid vertical or inclined installation.

2. Keep the vibrating screen stable

Maintain the stability of the vibrating screen equipment during use. Because the proportion of materials handled by the vibrating screen equipment is relatively large, and the work intensity is relatively high, various failure problems may occur during operation. If a failure problem occurs, it must be consuming the life of the vibrating screen. Therefore, the stability of the equipment must be maintained, which is also conducive to prolonging the service life.

Linear Vibrating Screen

3. Maintain the symmetrical balance of the eccentric block

When adjusting the eccentric blocks on both sides of the vibration motor, pay attention to the symmetry as much as possible, that is, the eccentric blocks at both ends should correspond to each other, or the connecting line of the eccentric blocks at both ends should be parallel to the axis of rotation and cannot be different planes. Otherwise, it is easy to make the vibrating screen unstable during operation, which may cause damage or burnout of the vibrating motor.

4. Dust the vibrating screen

Since the working environment of the vibrating screen is mostly harsh and dusty, if the vibrating screen equipment is operated in an open-air environment or in an environment where the protective cover is not tightly sealed, it is easy to get dust and cause the eccentric block to run by friction, thereby burning the motor. Therefore, in places where the working environment is harsh, firstly, increase the sealing of the protective cover, and secondly, frequently clean the dust inside the protective cover. This can also extend the service life of the vibrating screen.

5. Heat dissipation of the vibration motor

The bearing or main parts of the vibration motor are easily burned or burned when the temperature is too high under operation or abnormal operation. We can often vibrate the surface of the motor by vibrating the dust on the motor surface to make it work in good conditions. When working in a large environment, consider subtracting the heat dissipation ribs on the surface of the case. In addition, the equipment can be shut down to dissipate heat after operation.

Arc vibrating screen

6. The vibrating screen feeds uniformly

The vibrating screen is a continuous operation equipment, so the vibrating screen equipment needs continuous feeding. If you use too much during feeding, materials will accumulate on the vibrating screen, which will cause the vibrating screen to loosen and reduce fatigue. Due to the high screening efficiency, the equipment itself also increases the work load and damages the vibrating motor, so it is uniform Ground conveying vibrating screen is very important.

7. The material on the sieve surface is sieved cleanly

When the equipment stops production, the material on the screen surface should be sieved clean. After the production is completed, the screen surface materials should be completely screened before the shutdown is performed. This is because the residual materials in the screen surface and the screen body will corrode the linear screen frame and the screen and affect the service life.

8. Regular maintenance of the vibrating screen

Regular maintenance and maintenance of the vibrating screen is also very conducive to prolonging the service life of the vibrating screen. General maintenance is divided into weekly inspection, monthly inspection and annual inspection. The annual inspection is to overhaul the vibrating screen and disassemble the vibrating screen for cleaning. Maintenance also includes regular maintenance and daily maintenance. Regularly check whether the coarse mesh, fine mesh and spring are fatigued and damaged, and whether various parts of the fuselage are damaged due to vibration, and the parts that need to be lubricated must be lubricated.

High frequency dehydration vibrating screen

9. Choose high-quality vibrating screen

The quality of the vibrating screen directly determines the service life of the screen. Many people buy poor quality vibrating screens at increasingly cheaper prices. This is not conducive to production. It is also possible that some unconscionable manufacturers will install bad parts on other vibrating screen equipment and sell them at a low price. This will not only have a low equipment life, but also affect production and safety. There are great negative effects.

10. Handover work must be in place

The production of some enterprises is assembly line operation, and the screening machine works 24 hours a day. This requires the operator to make a record of the shift during the shift, record the output of the screening machine during use, the problems encountered during use and the solutions Wait. This can provide a good review for the next shift and targeted maintenance and observation.

The above is the answer to how to extend the service life of the vibrating screen. In general, there are correct installation of the vibrating screen, maintaining the stability of the vibrating screen, maintaining the symmetrical balance of the eccentric mass, and removing dust from the vibrating screen. The ten measures introduced can effectively extend the service life of the vibrating screen.