The linear vibrating screen has been widely used in coal screening in the coal mine industry,and the material from the feeder is evenly sent to the entrance of the screening machine.Through multi-layer screens,several screens and screens are produced.The objects are then discharged from their respective outlets.The linear vibrating screen uses vibration motor excitation as the vibration source,so that the material is thrown onto the screen and moves forward in a straight line.From the feeder,the material enters the feed inlet of the linear screening machine evenly through multiple layers.So how do we install the linear vibrating screen correctly?

Installation steps of linear vibrating screen

1.Place the machine on a flat and firm level floor(concrete or steel structure floor),then insert the anchor bolts(the base bolts are provided by the user)and fix it.
2.The spring is placed on the upper and lower seat ring(place the screen),the spring should fully enter the spring seat to ensure that it is vertical and not twisted.
3.The vibration part of the screening machine must not be rigidly connected or contacted with other objects outside the machine.
4.The motor can be installed horizontally and should be fixed on the installation surface to ensure that the installation surface is smooth and flat.
5.The motor lead adopts four-core rubber cable YZ-500V.When the power supply is connected,the lead cable is not allowed to have sharp folds and be securely fixed with the vibrating body.
6.The motor should have reliable grounding.There is a grounding device in the motor.There is a mark on the front end.It can also be fixed with a strong anchor.
7.Adjust the exciting force.The linear vibrating screen will vibrate greatly when it is opened or stopped through its vibrating area.In order to improve this situation,you can connect an electric brake device.

Installation of linear vibrating screen

1.Note that you must choose a screen with a larger 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 tightened,because the tightness of the screen is an important factor that affects the screening.
4.When installing a clear net pinball,you must pay attention to the difficulty of screening the material and the number of meshes,and you cannot install it blindly.
5.If the specific gravity of the material is large or the mesh number of the screen is high,a suitable supporting 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.

Installation of other parts of linear vibrating screen

1.Since the tension of the vibrating screen will directly affect the screening,the screen must be tightened and then installed.
2.When clearing the net bouncing ball,consider the number of meshes of the material and the difficulty of screening,and add the bouncing ball appropriately,not blindly.
3.If the mesh number of the screen is relatively high or the proportion of the material to be screened is relatively large,a layer of trawl with a suitable mesh size needs to be added under the screen to play a supporting role,thereby reducing the material to the screen.Pressure can also extend the service life of the screen.
4.The net frame is installed in the screen hammer breaker box as required,and the end of the screen should be extended into the corresponding outlet to avoid mixing.
5.After installation,you should use a little material to test the cloth and screening of the screen.If the material is transported forward uniformly,and the classification is accurate,there is no mixing phenomenon,then it can be put into use;on the contrary,if there is deviation or deviation For unevenness such as 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 screen and whether it is compressed should be checked.

The service life of the vibrating screen

The life cycle of a vibrating screen depends on the equipment production process and the actual use environment. The production process of a piece of equipment is equivalent to the foundation. If you want to have a long service life, you must lay a solid foundation! Regular vibrating screen manufacturers have a strict production process for the screening equipment at the sales office. Namely: detailed communication→design on demand→plate selection→actual production→assembly finished product→logistics delivery→installation and commissioning. The four links of communication, design, plate and assembly are directly related to the life of the vibrating screen.

Factors affecting the service life of vibrating screen

1. The influence of vibrating screen design
Whether the communication is detailed or not affects whether the finished product meets the actual production requirements of the user. Whether the design is qualified or not is an important link related to the user’s actual production output and equipment service life. Therefore, only detailed communication in the early stage can design and produce screening equipment that meets the user’s production requirements.

2. The impact of using plates

Different thicknesses of the same plate and different element content will also affect the service life of the vibrating screen. Common materials for vibrating screens are Q235 carbon steel and 304 stainless steel. Take the round screen as an example: Q235 carbon steel plate thickness is 3mm for the screen frame and 5mm for the bottom barrel. , 304 stainless steel sheet thickness is 2mm for the screen frame and 5mm for the bottom barrel. Simply put, the thickness of the same material is different, and the different element content will directly affect the service life of the equipment.

3. The impact of vibrating screen production and operation

In the process of using the vibrating screen, the nature of the material, the production environment, and the feeding method will also affect the service life of the equipment. In the actual production process, the production staff must strictly follow the design drawings and requirements to produce so as to ensure that it will not be affected! In addition, the vibrating screen The operating environment is also one of the key factors affecting the service life, such as environmental problems such as humidity and corrosion.

The linear vibrating screen is mainly composed of a screen box, a mesh frame, a screen mesh, a vibration motor, a motor base, a damping spring, and a bracket. Using the vibrating screen exciter as the vibration source, the material is thrown up on the screen while moving forward in a straight line. The material enters the inlet of the screening machine evenly from the feeder and produces several specifications through the multi-layer screen. The oversize and undersize items are respectively discharged from their respective outlets. It has low energy consumption, high output, simple structure, easy maintenance, fully enclosed structure, no dust spillage, automatic discharge, and is more suitable for assembly line operations.

Features of linear vibrating screen

(1) The design of the screen machine is exquisite and easy to assemble. One person can operate the screen machine.

(2) Compared with other related vibrating screens, it has a larger screening area and effective processing capacity.

(3) The unique structure design of the screen makes it easy and quick to replace the screen (only 3 to 5 minutes). In addition, this design allows the use of various material screens.

(4) The mother net completely supports the fine mesh, so the fine mesh can have a longer lifespan, and the use of fine mesh consumables is reduced, which can reduce many costs for the long-term production process.

(5) The linear vibrating screen has the characteristics of high screening accuracy, simple structure, convenient maintenance, low energy consumption, low noise, good sealing, reduced dust pollution, long screen life, and can be used for automated operations in assembly line production.

Working principle of linear vibrating screen

The linear vibrating screen is driven by dual vibrating motors. When the two vibrating motors are running synchronously and in opposite directions, the exciting force generated by the eccentric blocks cancels each other out in the direction parallel to the motor axis, and stacks in the direction perpendicular to the motor axis to form a resultant force, so the material is in the linear vibrating screen The motion trajectory on the machine is a straight forward parabolic motion. The two motor shafts have an inclination angle relative to the screen surface. Under the combined force of the exciting force and the material’s self-gravity, the materials are thrown up and jump forward on the screen surface for linear motion, so as to achieve the purpose of screening and grading the materials.

Linear vibrating screen installation

1. Screen box: It is welded from several steel plates with different thicknesses, with certain strength and rigidity, and is the main part of the screen machine.

2. Mesh frame: It is made of wood with less deformation, which is used to keep the screen flat and tight to achieve normal screening. If the specific gravity is large or the output is large, the metal screen frame can be used.

3. Screen: Use a composite national standard stainless steel screen.

4. The use and maintenance method of vibrating screen exciter can refer to its instruction manual.

5. Motor pedestal: The motor pedestal of the standard type (the motor is installed under the screen box) is movable. The connecting screws must be tightened before use, especially the new sieve must be tightened repeatedly three days before the trial to avoid loosening. accident.

6. Vibration damping spring: prevents vibration from being transmitted to the ground and supports the full weight of the screen box. When installing, the spring must be perpendicular to the ground.

7. Bracket: It is composed of channel steel and supports the main body of the vibrating screen. The pillars must be perpendicular to the ground during installation, and the channel steels under the two pillars should be parallel to each other. Rubber springs have been tested for static stiffness before they leave the factory. Springs with the same (or similar) stiffness should be selected and placed on different supporting positions of the same vibrating screen.

When installing, place the rubber spring on the lower support seat, make the boss on the support seat enter the inner hole of the spring, and then hoist the main body. Make sure that the inner hole of the rubber spring is centered on the boss of the support plate. The box is dropped vertically and placed on the rubber spring. At this time, the height of the rubber spring at each support point should be the same, and the error should not be greater than 2mm. The connection of each part of the sieve machine must be firm and reliable, all bolts must not be loose, and there must be no abnormal sound at each part. The small gap between the vibration-absorbing part on the main body and the surrounding fixed objects is 30-50mm.

Regular inspection and maintenance of linear vibrating screen

1. The linear vibrating screen should be equipped with electrical protection devices.

2. In the early stage of operation, check the anchor bolts at least once a day to prevent loosening.

3. When the motor rotation direction does not meet the requirements, adjust the power phase sequence.

4. The motor should be well lubricated. Replenish lithium grease (ZL-3) every two weeks or so. When refueling, add an appropriate amount of lithium grease through the oil cup. When using sealed bearings, the motor is not equipped with an oil cup.

5. After the equipment has been running for 1500 hours, the bearings should be checked and replaced immediately if there is serious damage.

6. When the linear vibrating screen is used again after being parked for a long time, the insulation resistance should be measured. It should be greater than 0.5 megohm for 500V megohmmeter measurement.

Before starting the linear vibrating screen, check whether there are obstacles that hinder the operation of the screen machine and whether the connecting bolts are fastened everywhere, especially the fixing bolts of the exciter, support seat, and screen plate should be tightened again. Check whether the rotation directions of the two vibration motors or exciters are opposite. If the rotation directions are the same, change the power connection of one motor so that the rotation directions of the two motors are opposite. After 4 hours of continuous operation, measure the bearing temperature. The bearing temperature should not exceed 75°C. Before the screen machine is stopped, the feeding should be stopped first, and then stop after the screen surface material is finished. After the pause, clean up the materials and debris on the screen surface in time. The vibrating motor or vibrating screen exciter should be refueled once after 3 months of use, minor repairs every six months, and major repairs every year.

As we all know, the operation of the vibrating screen is inseparable from the vibrating motor. The vibrating screen is driven by a vibrating motor. The frequency of vibration depends on the speed of the vibration motor. The speed of the vibrating screen is reduced, or the reduction ratio of the transmission system is increased. Large, can reduce the vibration frequency of the vibrating screen. Similarly, by increasing the rotational speed of the vibrating motor or increasing the acceleration ratio of the transmission system, the vibration frequency of the linear vibrating screen can be increased.

Specific operation steps: Open the end cover at one end of the vibrating motor on the vibrating screen. There is a cam inside and a scale on the top. The frequency can be achieved by adjusting the number of cams.

There are many different classification methods for vibrating screens. For example, according to the movement trajectory, there are linear screens, circular screens and high frequency screens. So no matter what kind of vibrating screen, you have to buy it back. If we encounter the problem of slow discharge, how can we solve it?

The vibrating screen is a machine that uses a vibration exciter or a vibrating motor to drive the screen surface to perform high-frequency vibration, so as to screen materials and have the characteristics of high precision and high efficiency.

The vibrating screen discharges slowly or does not discharge, I believe most users have encountered it, so many users first feel that this is a problem with the machine, it must be designed by the manufacturer without designing, and in fact, this phenomenon is very common, and There are very easy to solve problems, because the root cause of these problems is the vibration source of the vibrating screen.

It is not difficult to find the root cause, and then solve the problem of slower discharge of the vibrating screen, that is, adjust the weight of the upper and lower ends of the vibrating motor. You can start from two aspects:

1. Increase the weight of two weights: increasing the weight of the eccentric mass can increase the excitation force of the entire machine. Users can increase the weight according to the number of layers of the vibrating screen and the specific gravity of the material, so the vibrating screen and the material can achieve the desired ideal effect.

2. Change the angle between the upper and lower weights: the angle of the weight changes, the movement trajectory and residence time of the material on the screen will change. The larger the angle, the smaller the eccentric force generated, and the longer the material is on the screen. The finer the screen, the slower the discharge speed. Conversely, the smaller the angle, the greater the eccentricity, and the shorter the residence time of the material. Accordingly, the discharge speed will increase. This type of adjustment is more suitable for coarse drying and screening of larger particles. Therefore, the user should adjust the angle between the two weights according to the nature of the material to be screened, so that the distribution of the material, the processing capacity and the super-netting speed can reach the ideal screening state.

When producing and designing the same type of vibrating screen, the setting is determined. Different materials require different adjustment methods. Users can adjust the angle of the hammer according to their needs. The vibrating screen is in ideal working condition.

Since the operation of the vibrating screen is closely related to the vibration exciter, we have to talk about the relevant content of the vibrating screen exciter.

Working principle of vibrating screen exciter

The vibrator is composed of two single unbalanced weight vibrators, and a pair of inertia gears mounted on the ends of the two vibrating shafts make them forced to contact (it can also be driven by dual motors). When the driving shaft rotates, the driven shaft rotates synchronously in different directions. In each instantaneous position, the component forces of the centrifugal inertial force generated by them always cancel each other out, and the component forces in the direction always overlap each other, thus forming A single exciting force along the direction drives the movement of the screen surface.

The function of vibrating screen exciter

• The exciting force passes through the center of mass of the screen body;
• The stiffness of the damping springs at the four-corner supports are exactly the same, and the distance to the center of mass should be similar. These two conditions are completely determined by the design and manufacturing accuracy. Under normal circumstances, the vibrating screen is forced to vibrate under forced alternating deformation, and the vibration intensity is large, and the signal that contains the dynamic characteristics is substantially annihilated. Therefore, it is difficult to realize the vibration screen in the case of braking failure based on the above-mentioned traditional model A complete reflection of dynamic characteristics. This model actually simplifies the vibrating screen body into a four-corner elastic support rigid body structure.

vibrating screen exciter Technical characteristics

• The self-synchronization principle is used to make the vibrating machine produce linear vibration.
• When working, fix the exciter on the excited part, and the excited part will obtain the required vibration.
• Lubrication methods: grease lubrication and thin oil lubrication, customized according to customer requirements.
• The motor is installed on the fixed base on the side (left or right) of the vibrating machine. The motor does not participate in vibration, and the motor is connected to the vibrator with a universal joint shaft.
• The eccentric block is easy to adjust and disassemble.
• The design life of the bearing is more than 10,000 hours.
• Both contact and axial labyrinth seals are used for good sealing performance.
• An oil injection hole is set above the casing to ensure good lubrication of the bearing.
• It has the advantages of light weight, small size, simple structure, convenient installation and maintenance, and long service life.
• It has the characteristics of stable and reliable operation, flexible adjustment and small maintenance.
• The service life is 1-3 years.

Linear vibrating screens are usually used for de-intermediation and dewatering operations in coal preparation plants. They are mainly used for de-intermediation and dewatering operations in coal preparation plants.

There are many types of structure and transmission methods for linear vibrating screens, such as flexible connection, universal joint shaft connection, etc. The excitation methods include eccentric sliders, box-type vibration exciters, etc. The vibrating screen manufacturer mainly introduces the following detailed introduction for the routine operation and maintenance of the linear vibrating screen in the form of the current compact box-type vibration exciter.

Main components of linear vibrating screen

1. Screen body: usually adopt ring-groove rivets to clean and seal assembly to avoid the corrosion of the bolt joint surface by wet objects. At the same time, the side panels are assembled without welding seams and rivets hydraulically to ensure that the overall structure has no residual stress.

2. Vibration beam: usually a box-shaped design, the main welds are fully penetrated, first-level UT inspection and magnetic particle inspection, and heat treatment to eliminate welding stress to ensure high strength. Before assembling, the mating surface of the excitation beam is precisely processed by CNC machine tools, which effectively guarantees the overall assembly quality of the screen.

3. Crossbeam: Usually circular special pipe design is adopted, and the main welds are all penetrated. First-level UT inspection and magnetic particle inspection are carried out, and heat treatment is carried out to eliminate welding stress and ensure strength. The surface can be treated with polyurethane spraying process to improve erosion and corrosion resistance.

4. Vibration exciter: It is composed of special vibration bearing, eccentric pendulum block, magnetic oil plug and other components, and uses splash lubrication to excite. The exciter can work normally under the temperature of -30℃~+80℃, usually with special respirator.

5. Intermediate shaft: Use an intermediate shaft to connect between the two exciters to ensure the synchronous rotation of the left and right exciters. Both ends of the intermediate shaft are connected with the pendulum block of the vibration exciter by a unique elastic rubber disc coupling. The intermediate shaft is a rigid shaft, maintenance-free and without lubrication.

6. ​​Main drive shaft: The main drive shaft is a universal joint shaft that connects the statically fixed installation drive mechanism and the dynamic vibrating screen body.

7. Drive mechanism: The drive mechanism is composed of a motor, a belt drive and a countershaft assembly. The main motor has a large starting torque and fast acceleration, so that the screen machine quickly passes through the resonance zone. The motor is installed on the rail seat to facilitate belt tensioning. The transmission mechanism adopts belt drive to adjust speed and reduce speed, transmit power, and adjust the belt tension with guide rail seat screw tension motor. The countershaft assembly is composed of a countershaft, a bearing, an adapter sleeve, a labyrinth seal and an open bearing seat.

8. Cushioning spring: steel coil spring is used for vibration isolation and cushioning between the vibrating screen body and the installation base. The spring stiffness is small, which reduces the dynamic load on the base. Rubber pads are added at both ends of the spring to reduce the friction and friction noise between the spring and the steel spring seat plate.

9. Screen surface: According to the purpose and user needs, the screen surface adopts different types of sieve plates. The main types are: continuous sieve slotted polyurethane sieve plate, polyurethane frame stainless steel slotted sieve plate, polyurethane frame stainless steel woven sieve plate, polyurethane frame stainless steel punch Hole sieve plate.

The operating procedures of the linear dewatering screen

1. Before driving, check carefully whether the sieve plate is damaged, loose, whether the eccentric shaft bolt is loose, whether there is any debris on the screen surface, whether the chute is unblocked, the water spray device is intact, and no one is working on the equipment.

2. The screen surface should be flat, free from damage or looseness, and the joints should be tight. The sieve holes and sieve slits of the deintermediation sieve should not be too large, small, or excessively worn.

3. The exciter, vibration motor and other lubrication parts should be well lubricated; the support spring should be free from damage, lack and aging failure; all safety facilities should be complete and intact, and comply with relevant regulations.

4. Try to drive without load; the sieve that needs to be sprayed with water should not be blocked, otherwise it should be cleaned immediately.

Three, the start and stop sequence of the linear dewatering screen:

Start sequence:

1. The inspection before the start of the separation screen is completed, and the shift leader or production dispatcher has been given a driving instruction to confirm that the equipment in the next process has been started and operating normally before starting the screen.

2. After the sieve is started, first turn on the water spray and confirm that it is normal before allowing the material to be fed to the screen surface. Adjust the water spray size in time according to the material on the screen surface.

After the start-up is completed, perform a comprehensive inspection and make a record of the shift.

1. You must get a parking instruction before you can stop.

2. It must be known that the equipment in the previous process has indeed been stopped.

3. Before stopping, all materials on the screen must be unloaded, and then shut down after turning off the water spray.

Operation and maintenance

1. Check the incoming materials, discharge and spray pipes regularly during operation, and report them if they are blocked.

2. Frequently monitor the eccentric shaft, whether the sound is normal, whether the sieve plate is loose, whether there is water running on the sieve surface, report and deal with it in time.

3. During operation, pay attention to check the temperature of each bearing, the temperature of the motor, the sound, the working state of the coupling and the amplitude of the screen under different loads, and report the problem in time.

4. The screen box should vibrate smoothly during operation, and there should be no abnormal swings. If the screen box shakes, check the working conditions of the four support springs and the running direction of the motor.

5. Pay attention to the working conditions of the exciter and the vibration motor during operation. The spindle should rotate flexibly and the bearing should be well lubricated; pay close attention to the bearing temperature.

6. ​​The vibrating screen should regularly check the concentration and particle size composition of the water under the screen to determine the wear of the screen. If the wear is serious, it should be replaced in time.

7. The de-intermediation vibrating screen should adjust the pressure and water volume of the water spray to ensure that the heavy medium of the product on the screen is flushed; often check (see, touch by hand) the de-intermediation effect and moisture of the product on the screen, and adjust according to the inspection result The amount of water sprayed can improve its cleaning effect; closely contact the density control driver to jointly adjust and ensure the deintermediation effect and dehydration effect of the deintermediation screen.

8. The technical indicators of de-intermediation and dewatering include: unit consumption of water spray, concentration of under-sieve and super-grain content, product on-screen and moisture. The driver should strive to complete the above-mentioned indicators stipulated by the factory.

The main measures to complete the index of removal of referral and dehydration

1. In order to strengthen the maintenance of the equipment, keep the vibrating screen in a good working condition; clean the nozzles frequently to ensure uniform spraying; strengthen the management of the screen surface and observe the dynamics during operation. After parking, check frequently, clean up frequently, fill loopholes frequently, and clear blockage frequently to ensure the effective separation (water) area of ​​the screen surface.

2. It is strictly forbidden to put the scattered coal into the funnel under the sieve; it is strictly forbidden to run without water.

3. Regularly check, adjust and replace the coupling and support spring; clean the screen surface and chute; check the tightness of the screen surface, and deal with it if it is loose.

4. Use the parking time to perform equipment maintenance, and deal with problems that occur during operation and check after parking.

5. Do a good job in equipment and environmental sanitation, fill out the work log as required, and do a good job of shifting shifts.