Mine vibrating screens are generally large-scale screening equipment with a certain weight. And during operation, due to the mutual collision and friction of materials, such as ore, a large amount of dust is easily generated, and then there is a problem of flying dust.

Generally, the dust from the vibrating screen is distributed densely, not only on the screen surface, but also a certain amount of dust will be scattered at the screen surface gap and the feed inlet, which is very unfriendly to the working environment of the operator and has certain hazards. , Then how to deal with the dust from the vibrating screen?

Causes of dust from vibrating screen

1. A large amount of material accumulation

Because a large amount of materials are accumulated in the feed inlet of the vibrating screen, more dust is generated. Especially for the vibrating screen with a large output, such as the mining vibrating screen of about 1,000 tons, the dust problem is very much.

2. The interface is not well sealed

(1) The interface is the discharge port of the vibrating screen and the sealed interface of the receiving equipment. This place is not well sealed and connected, which will cause the vibrating screen to fly in dust. If necessary, a sealed soft connection should be made at the discharge port, and computer intelligent control is adopted to realize automatic discharge without manual, which can greatly reduce dust escape during the discharge process.

(2) The sealing cover (dust cover) of the vibrating screen and the box body are usually fixed by bolts, and it is inevitable that there will be fine gaps between the sealing dust cover and the box body.

3. The vibrating screen vibrates strongly

During the operation of the vibrating screen, due to strong vibration, a large amount of dust will also be generated. On the one hand, the outside of the equipment must be sealed, and on the other hand, the dust removal equipment on the equipment is also very necessary.

Measures to deal with dust from vibrating screen

1. It is possible to add a closed silo and the feed inlet to the top of the equipment for a sealed connection to reduce the probability of external exposure of the raw materials. The belt conveyor belt inside the silo can also speed up the material transmission.

2. The tilt angle of the vibrating screen, the vibrator is placed at an angle of 45°. In this way, the material can be pushed forward, and horizontal ribs can be added to the pipe if necessary, so that even an upward slope will not hinder the feeding of the material and will not generate more dust.

3. The gap between the dust cover and the box body should be minimized as much as possible, so in the daily work process, it should be tightened continuously to avoid the escape of dust due to loose parts.

4. In daily production, remember to check the fasteners of the vibrating screen regularly to avoid additional vibration due to the loosening of individual components. Do regular maintenance and repair of the vibrating screen equipment daily to ensure the operating status of the screening equipment The key to health.

Misunderstandings in handling the dust of vibrating screen

To deal with the dust problem of the vibrating screen, some users will choose to add negative pressure to solve this problem. This is actually a misunderstanding, because the dust problem of the screening operation is generated by the vibrating screen itself, and the dust generated by the vibration of the vibrating equipment itself is actually very limited. Yes, only adding negative pressure to the vibrating screening equipment cannot solve the dust problem in the screening workshop. It needs to be analyzed and controlled from the aspects of feeding, receiving, and transportation.

The source of the dust problem of vibrating screen

From the above analysis of the cause of the dust problem, the main source of the problem comes from the following two aspects:

1. Feeding dust: it has a direct impact on the feeding tools on site, the dust generated by manual feeding, the dust generated by the equipment feeding equipment connection without a sealed soft link, and the dust generated directly.

2. Material splicing and dust: The same is caused by manual splicing without protection, and the splicing equipment is not well sealed and connected.

The above is the answer to how to deal with the dust from the vibrating screen. Only by doing a variety of treatment and protective measures can the dust hazards of the vibrating screen be reduced.

The use environment of mine vibrating screens is generally harsh, and they are basically used outdoors, unavoidable from wind, sun and rain. In the mining industry, many materials also contain a certain amount of dust. When vibrating screens are used for screening , These dust and other dust will enter the vibrating screen, so it is necessary to clean the vibrating screen to ensure that the vibrating screen can be screened better, so how to clean the vibrating screen? The editor of Heside is here to explain it to you.

Vibrating screen cleaning steps

1. Equipment cleaning

The operator turns off the power switch from the switchboard. Unload the vibrating screen hopper (upper cover), screening mesh, and fine powder hopper in turn, and clean the inner and outer surfaces of the vibrating screen hopper (upper cover), screening mesh, and fine powder hopper. Transfer the hopper (upper cover), screen mesh, and fine powder hopper of the vibrating screen to the container cleaning room, put it in the cleaning tank, soak in purified water for 10 minutes, rinse the remaining materials with purified water until there is no visible foreign matter on the surface, and dry it , Assemble the equipment after drying. Use a cleaning cloth dipped in purified water to wipe off the dust, stains, and materials on each surface of the body. Visually observe that the surface of the equipment is bright and clean without visible stains.

2. Equipment disinfection

Before using the equipment, unload the hopper (upper cover), screen mesh, and fine powder hopper of the vibrating screen, and wipe the inner surface of the vibrating screen hopper (upper cover), screen mesh, and fine powder hopper with a mercerized towel dipped in 75% ethanol solution . Assemble the sterilized equipment in the order of fine powder hopper, screen mesh, and hopper (upper cover) from bottom to top.

Precautions for vibrating screen cleaning

1. When the vibrating screen is cleaned, the temperature should be between 30°C and 50°C. If the temperature is lower or higher than this temperature, the cleaning effect will not be ideal;

2. Cleaning liquid is needed to clean the vibrating screen. The higher the viscosity of the cleaning liquid and the higher the gas content, the better the cleaning effect;

3. When cleaning the vibrating screen, pay attention to the location of the object to be cleaned and the depth of the cleaning liquid. When the location of the cleaning object is relatively hidden, the depth of the cleaning liquid should be adjusted appropriately to ensure that it can be cleaned to the target position.

4. Check the upper and lower screen surfaces of the vibrating screen to remove impurities on the screen surface.

5. Check the bottom of the vibrating screen and clean the impurities to ensure that the bottom is unobstructed.

6. Check the fixing nut of the screen frame at the feed end of the vibrating screen to ensure that the screen frame has been compressed.

7. Start the cleaning equipment, pay attention to observe the vibration of the screen body, if there is abnormal jumping, shaking or abnormal noise, stop it immediately, check and eliminate the fault.

8. The impurities on the upper sieve surface should be cleaned at least once every 1 hour, and the lower miscellaneous bags should be replaced in time when they are full.

9. If the equipment is not running for a long time, the upper and lower sieve surfaces should be removed according to the “Maintenance Manual” to completely remove impurities, and check whether the sieve surface is damaged.

10. Frequently clean the sanitation around the machine to ensure the requirements of civilized production.

The frequency of vibrating screen cleaning

1. After each use of the vibrating screen, perform simple cleaning.

2. Disinfect the vibrating screen after cleaning and before use

3. After the vibrating screen is cleaned, it needs to be disinfected if it is used again within 48 hours. If it has not been used for 48 hours, it should be cleaned and disinfected again before using it again.

4. After the vibrating screen is used, the cleaning work should be completed within 4 hours.

The above is the answer on how to clean the vibrating screen. Generally, the scope of vibrating screen cleaning includes the hopper, screen, inner and outer surfaces of the vibrating screen, and the outer surface of the main body. Remember to turn off the power when cleaning. Effective cleaning is helpful to improve the working environment and screening effect of the vibrating screen.

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.

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. .

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.

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.

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

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

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.