Which parts of the vibrating screen should be lubricated? Bearing and vibration exciter

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Vibrating screen equipment is composed of various parts, such as screen box, screen, eccentric shaft, vibration exciter, etc. The maintenance of the vibrating screen is the maintenance of each component. Among them, lubrication is compared in maintenance For important items, any mechanical equipment needs lubrication to operate normally. So which parts of the vibrating screen should be lubricated?

1. Eccentric shaft of vibrating screen

High frequency dehydration vibrating screen

The mine vibrating screen is mainly rotated by the eccentric shaft in the machine, and the machine is forced to reciprocate in the direction by the connecting rod to realize the mechanical equipment of the material screening operation. During the use of the vibrating screen, it is necessary to frequently maintain and repair the machine, especially the maintenance of the eccentric shaft, so it is necessary to lubricate the eccentric shaft of the vibrating screen.

(1) The amount of grease added to the eccentric shaft of the vibrating screen should be filled with one-half to one-third of the internal space of the eccentric shaft. It should be reduced to one-third when the eccentric shaft is running at high speed, otherwise Too much grease will cause the temperature of the eccentric shaft to rise and damage the equipment.

(2) When the vibrating screen is in high-speed and high-temperature conditions, the grease can no longer adapt to the eccentric shaft lubrication of the machine, and oil lubrication is required. Commonly used lubricating oils include mechanical oil, cylinder oil, high-speed mechanical oil, compressor oil, and transformer Oil, turbine oil, etc.

(3) Through oil lubrication, a large amount of heat energy produced by the equipment can be taken away, and the vibration and noise of the machine can be reduced.

(4) When choosing the lubricant for the eccentric shaft of the vibrating screen, the viscosity is its important characteristic, and the viscosity of the lubricant should be controlled at 12cst-15cst. Note that the higher the speed of the eccentric shaft, the lower the viscosity of the lubricating oil, and the higher the viscosity of the lubricating oil when the load is heavy.

2. Vibrating screen exciter

Linear vibrating screen

For the lubrication of the vibrating screen exciter, gear oil should be selected, and the type of gear oil is different at different temperatures.

(1) When the ambient temperature is less than 5°C, use No. 70 industrial gear oil. When the ambient temperature is greater than 5°C, use No. 90 industrial gear oil.

(2) Grease is injected into the groove between the sealing plate of the vibrating screen exciter and the isolation ring to seal, and the oil cup is used to fully inject grease once a week.

(3) The amount of oil injection depends on the size of the vibrating screen exciter. A small amount of oil drops continuously dripping out, indicating that the oil amount is just right. If a large amount of lubricating oil overflows, the oil level is too high, otherwise the oil amount is too low.

(4) The eccentric block of the vibrating screen exciter runs relatively under the action of external force; the bearing of the vibrating screen exciter should be refilled with grease regularly, usually once every 3-5 months;

(5) The vibrating screen exciter runs for 5-6 months, minor repair once, and major repair once a year. The minor repair removes the dust and dirt of the machine. In addition to the necessary minor repairs and maintenance, the wear rate of the bearing must be checked, if necessary Immediate replacement and maintenance.

3. Various bearings of vibrating screen

Arc vibrating screen

Lubrication has an important impact on the fatigue life and friction, wear, temperature rise, vibration, etc. of the rolling bearing of the vibrating screen. Without normal lubrication, the bearing cannot work. Analysis of the reasons for the damage of the vibrating screen bearing shows that about 40% of the damage of the vibrating screen bearing is related to poor lubrication. The lubrication methods of vibrating screen bearings are mainly divided into grease lubrication and oil lubrication.

If lubrication is used, thin oil lubrication is required, and the oil is changed after 40 hours of initial operation, and the normal service cycle thereafter is about 800 hours; if grease lubrication is used, it needs to be considered in terms of the speed, load, temperature, etc. of the bearing during operation .

The above is the answer to which parts of the vibrating screen need to be lubricated, mainly the eccentric shaft, exciter and various bearing components of the vibrating screen need to be lubricated. One-third to one-third is suitable. Lubrication is the maintenance of the vibrating screen equipment, so it is necessary to do a good job of lubricating the vibrating screen.

How does the vibrating screen screen multiple materials? Change the vibrating screen amplitude

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When purchasing a vibrating screen, users will pay more attention to the cost performance, such as the screening effect, function, etc., whether the price is reasonable or not, they are more concerned about. Generally, vibrating screens are sometimes dedicated and can only screen one type of material. However, for current production, how to screen multiple materials with vibrating screens has become a trend, which means that one vibrating screen equipment can screen different forms Materials such as particle size and characteristics are screened.

How to screen a variety of materials with a vibrating screen

High frequency dehydration vibrating screen

1. Change the vibrating screen amplitude

To realize the screening of a variety of materials by the vibrating screen, the amplitude of the vibrating screen can be changed according to the characteristics of the material. To make the vibrating screen achieve better screening results for materials with different properties, the amplitude of the vibrating screen needs to be adjusted accordingly , Because different materials have different shapes due to molecular structure, the requirements for amplitude are also different. For example, materials with relatively heavy specific gravity and good fluidity are suitable for screening with low amplitude, while materials with poor fluidity generally require high amplitude to achieve better screening results.

2. Replace the vibrating screen

The particle size of the material varies greatly according to the shape and type. Therefore, to realize the screening of a variety of materials by the vibrating screen, it is necessary to realize the variability of the mesh number of the screen. The simpler method is to purchase multiple screens of different meshes from the vibrating screen manufacturer or a nearby manufacturer, and manually replace the screens according to the needs to achieve screening of multiple materials.

It is worth noting that the screen is the part of the vibrating screen equipment directly in contact with the material, and it is an important guarantee for determining the accuracy of material screening and the output value. However, many users often find that the screen is broken. It is recommended that users should pay attention to the equipment operation: the oscillation force should not be too large, and should be within the equipment range, and the feeding amount should not be too large to prevent the screen from breaking. . In addition, the quality of the screen is affected by the choice of material, the thickness of the warp, and the placement of the warp and weft during weaving. Therefore, a good supplier should be selected when selecting related accessories.

Linear vibrating screen

3. Adjust the vibrating force of the vibrating screen

To screen a variety of materials, the other is to adjust the vibrating force of the vibrating screen according to the output requirements and the difficulty of the material through the screen. The adjustment of the vibrating force of the vibrating screen is mainly achieved by changing the angle of the upper and lower weights of the vibrating motor. The reason for changing the vibrating force is that the stickiness, water content, and specific gravity of the material are closely related to the sieving rate, and the output of two different materials on the same equipment is also quite different.

Therefore, when sieving materials that are difficult to pass through, it is necessary to increase the vibrating force to ensure a certain production efficiency, and when sieving materials with a higher sieving rate, the vibrating force can be reduced to reduce unnecessary energy. Waste. The size of the vibrating sieve force is not only related to the type of material, but also closely related to and proportional to the number of screen meshes.

The above is the answer and analysis of how the vibrating screen sieving a variety of materials. It is mainly possible to change the vibrating screen amplitude according to the characteristics of the material, replace the screen, and adjust the vibrating screen force according to the difficulty of sieving the material. It can be seen from these several methods that if you want to screen a variety of materials, the key lies in the diversified adjustment of the vibrating screen’s amplitude, screen, and excitation force to achieve the variability of these three parameters.

How to deal with the loosening of the vibrating screen frame?

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The vibrating screen is mainly composed of a vibration exciter, a screen, a screen frame, a suspension device, and a transmission device. As large as the transmission device, as small as the screen frame, any problems in these parts will affect the use of the vibrating screen. The loosening of the screen frame is a common problem. If it is loose, it will affect the material screening efficiency of the vibrating screen and cause a certain noise. At the same time, it may be accompanied by serious phenomena such as frame fracture. So what should I do if the screen frame of the vibrating screen is loose?

Reasons for the loosening of the vibrating screen frame

1. Rubber strip wear

The rubber strip between the screen and the screen frame is worn, and the screen frame cannot be closely connected with the screen, which causes the vibration screen frame to become loose.

2. The screen is not tightened correctly

The screen of the vibrating screen is not tightened, so the screen frame will loosen. After understanding the reasons, we will introduce the treatment measures for the loosening of the screen frame.

Linear vibrating screen

Treatment measures for the loosening of vibrating screen frame

1. If abnormal noise is found due to the loosening of the screen frame, first check and judge the condition of the beam ring around the vibrating screen frame. If the beam ring is damaged or the beam ring wire is loose, it must be replaced and tightened immediately;

2. When tightening the ring or replacing the installation, remember to knock the ring with a rubber hammer for a week after installation to ensure that the ring and the frame are tightly connected, otherwise there may continue to be loose in the subsequent screening work ；

3. When replacing or tightening the ring of the circular vibrating screen, remember to use the wrench lock to tighten the ring wire to prevent the bolts that are not fully tightened from loosening or breaking during the screening work;

Arc vibrating screen

4. If the small tie ring is not faulty, the tie ring and screen frame should be disassembled to check whether the internal sealing strip is displaced, loose, aging, or broken. If so, replace the sealing rubber ring in time;

5. After completing the above inspection, basically all the problems that may cause the screen frame to be loose have been eliminated, but for the sake of safety, let the equipment idle for a few minutes before starting the equipment after adjustment, and make sure that there is no abnormal noise or shaking. Before it can be put into production.

The above is the answer to how to deal with the loosening of the screen frame of the vibrating screen. Generally speaking, the vibrating screen will go through a test machine after the manufacture is completed to ensure that there are no problems before giving it to the customer. There will be no loosening of the screen frame, but with frequent use , The replacement of screens, seals and other accessories, etc., can not be sufficiently fastened when re-assembled, or the maintenance of the vibrating screen is neglected in daily use, various problems may occur.

How to deal with the dust from the vibrating screen? Causes and treatment measures

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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

Arc 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

Linear 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

High frequency dehydration 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.

What are the reasons for the mixing of the linear vibrating screen? Causes and solutions

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The linear vibrating screen can achieve multi-layer screening. Its function is to screen and classify the materials that need to be screened. However, if there is a mixing problem, if the problem is found early, it can be dealt with in time. If the problem is found late , Then the role of vibrating screen screening will be meaningless, and a lot of useless work has been done, so knowing the reasons for the mixing of linear vibrating screens is the key to solving the problem.

Reasons for mixing of linear vibrating screen

Linear vibrating screen

1. Reasons for the sealing strip

(1) Deformation of the sealing strip

Deformation or rupture of the sealing strip can easily cause mixing of the linear vibrating screen. The screen frame and the screen body of the vibrating screen are equipped with sealing strips for sealing. The commonly used sealing strips are natural rubber and silica gel. After the vibrating screen is used for a period of time, the sealing strips will be deformed or broken, which is prone to mixing.

(2) The sealing strip is not tightly sealed

There are three possibilities for the sealing of the sealing strip: the sealing strip is not matched with the linear vibrating screen; the quality of the sealing strip is not good; it is not carefully installed during installation, which causes the sealing strip to appear during use and the sealing is not good.

2. Material accumulation on the screen surface

The screen surface has long-term accumulation of materials and even mesh blockage. The screen surface of a linear vibrating screen is generally composed of a woven wire mesh with a fixed aperture that undertakes the screening work. If there is a long-term accumulation of materials on the screen surface or the phenomenon of screen blockage, the weight of the accumulated material plus the vibration screening The downward force combined with the exciting force of the machine will press the material particles that do not meet the sieving specification to squeeze the sieve holes, deform the sieve holes and loosen the sieve, and then the phenomenon of material mixing will occur.

3. Broken screen

The screen of the vibrating screen is a vulnerable part, and different screening materials have different abrasion on the screen. The continuous operation of the screen while the load on the screen is quite large, which will cause the screen to be damaged and easy to appear. Mixing condition: The screen is broken due to long-term use, resulting in mixing.

4. The material running track is wrong

The running track of the material on the screen surface is wrong, causing the small particle material and the large particle material to be unable to be completely classified, and the large particle material and the small particle material are mixed together, which results in the phenomenon of mixing.

5. The motor’s excitation force is too small

The magnitude of the motor’s exciting vibration force directly affects the screening of materials. If there is a mixture of materials, it is possible that the exciting force is too small, and the materials are not completely separated. This situation is mostly caused by the longer use time of the vibrating screen motor. Long time or the time to replace the motor.

6. The feed inlet is close to the edge of the screen frame

The linear vibrating screen relies on the screen fixed by the mesh frame in the screen box to screen the material. Users who are familiar with the structure of the linear vibrating screen and the fixing method of the mesh frame can find that the screen mesh frame and the edge of the screen box There are gaps. If the edge of the feed port frame at the rear end of the feed port is close, and the feed volume is too large, it is easy to cause a small amount of powdery particles to jump to the gap between the rear baffle of the vibrating screen and the screen frame, resulting in Mixing of upper and lower materials.

7. The screen frame is not stretched forward

Since linear vibrating screens often need to meet the screening needs of users for large-volume production, the size of the fuselage is often large and medium-sized equipment of 2m or more. The size of the screen frame of the vibrating screen is also increased according to the size of the body. At the same time, in order to ensure the convenience of screen replacement and facilitate the installation and removal of the screen frame, the linear vibrating screen is designed with a free space of 2cm at the front end. Therefore, if the bead on both sides of the screen frame is not stretched forward after the screen is changed, the material is likely to jump along the bead angle in the screen box and enter the discharge without being screened by the vibrating screen. Feeding mouth, produce mixing phenomenon.

The solution to the mixing of linear vibrating screen

High frequency dehydration vibrating screen

1. Check the sealing degree of the vibrating screen frame and the screen body, the screen frame and the screen frame. If the seal is not tight, it is recommended to use a sealing strip to seal or replace the screen frame. When using the vibrating screen, the user should regularly check the use of the sealing strip, and replace it in time if it is damaged.

2. For the problem of changing the angle of the vibrating motor, the angle of the motor can be adjusted according to the screening situation of the material to change the running track of the material on the screen surface and improve the screening accuracy. Generally, the motor angle of the vibrating screen is adjusted to 65 degrees when it leaves the factory.

3. Properly adjust the excitation force of the motor or replace with a new motor.

4. In the production process, check whether the screen is damaged. If it is found to be damaged, it should be replaced in time. To ensure the quality of the screened materials.

5. Choose a good quality screen, check the use and wear of the screen regularly, so as to avoid the damage of the screen as much as possible.

The above introduces the reasons for the mixing of the linear vibrating screen. The main reasons are the deformation of the sealing strip or the lack of sealing, the accumulation of materials on the screen for a long time, the damage of the screen or the long-term use, and the motor’s excitation force is too small. Etc., these are all causes of mixing.

If you want to solve the mixing, you need to start with the reasons, such as checking the sealing degree of the vibrating screen from time to time. Hiside focuses on the production of mining vibrating screens, with high screening efficiency and high strength, and they have been tested and run before leaving the factory to ensure product quality.

How to clean the vibrating screen?

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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

Arc vibrating screen
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

High frequency dehydration vibrating screen

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.

Linear vibrating screen

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.

Installation method of vibrating motor of linear vibrating screen

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The reason why the linear vibrating screen has a high screening efficiency is because of the exciting force generated by the vibrating motor. The vibration motor is equipped with a set of adjustable eccentric blocks at both ends of the rotor shaft, and the excitation force is obtained by the centrifugal force generated by the high-speed rotation of the shaft and the eccentric block.

The installation steps of the vibrating motor are very simple, as long as the bolts and the screen frame are used for fixing, but the key to installation is to choose the appropriate installation method, so what are the installation methods of the linear vibrating screen vibrating motor? Below, the editor of Hiside will introduce four installation methods.

Installation method of vibrating motor of linear vibrating screen

High frequency dehydration vibrating screen

1. Front-end installation

It is not very common to install the vibrating motor at the front end of the feed inlet of the linear vibrating screen, and many vibrating screen manufacturers will not mention this installation method because it is suitable for small linear vibrating screens. Unless the user has such special requirements, please consult the staff for details.

2. Bottom installation

Install the vibrating motor at the bottom of the linear vibrating screen. This is a relatively common installation method. For example, the width of the customer’s site is limited. In addition to the linear screening machine, there should be a certain width on both sides of the linear screen to facilitate feeding, maintenance and other operations. If the overall equipment is too wide , There will be a problem of being unable to put it down or reluctantly putting it down, but it is inconvenient to use in the future.

Of course, this problem can also be solved by reducing the overall width of the screen frame of the linear screen, but this will reduce the effective screening area of ​​the equipment, resulting in a smaller processing capacity, affecting screening efficiency and production progress, so you can choose to use the vibration motor It is installed at the bottom of the equipment to reduce the overall width of the linear screen, which ensures the effective screening area of ​​the equipment, does not affect the processing capacity and screening efficiency, and greatly reduces the overall width of the linear screen equipment.

3. Top installation

Install the vibrating motor on the top of the linear vibrating screen. This installation method is quite special. For companies that have requirements for the height and width of the discharge port of the linear screen equipment, if the height and width of the customer’s linear screen equipment outlet are restricted, the vibration motor will be installed at the bottom or on both sides. Will not be able to meet the requirements. At this time, the vibration motor can be installed in the middle of the top of the unit, so that it will not increase the width of the unit or the discharge height of the unit. This installation method is very common in heavy linear vibrating screens, such as mine screens and dewatering screens.

4. Install on both sides

This installation method is also a common method for the vibration motor of linear vibrating screen equipment. It is usually used when the customer has restrictions on the overall height of the equipment, but there is no restriction on the width of the equipment. The vibrating screen with this installation structure is again called a side-vibration linear screen. For example, due to the special requirements of some materials, the discharge port of the equipment cannot be too high from the ground. In this case, if the vibrating motor is still installed at the bottom of the linear screen, the overall height of the equipment is difficult to control.

The height of the screen box of the linear screen is usually fixed, so the height of the screen box cannot be adjusted, then the vibration motor can be installed on both sides of the linear screen instead of the bottom of the equipment, which can greatly reduce the equipment. The overall height meets the customer’s restriction requirements on the overall height of the linear screen without affecting the working efficiency of the equipment.

Arc vibrating screen

The characteristics of different installation methods of vibration motor

1. The characteristics of the vibration motor installed at the bottom of the equipment: the overall width of the linear screen is reduced, thereby ensuring the effective shielding area of ​​the equipment without affecting the output and shielding efficiency, reducing the width of the sieve machine, and saving A certain amount of space. That is safe and reliable, but also save space. However, this method will reduce the effective screening area of ​​the linear screen, reduce the processing capacity, and affect the screening efficiency and production schedule.

2. The characteristics of the vibration motor installed on the top of the equipment: a good way to effectively solve the customer’s restrictions on the height and width of the linear screen. This installation method is feasible under the condition of a certain work site.

3. The characteristics of the vibration motor installed on both sides of the equipment: the height of the linear screen is reduced. This installation method can be adopted when the material processing requires a certain restriction on the discharge opening from the ground, but the height of the linear screen is fixed.

In summary, four installation methods of linear vibrating screen vibration motors are introduced. Among them, the common installation methods are the bottom and two sides installation, while the top and front installation are special and not very common. When we choose the installation method, we can choose according to the actual situation, such as site requirements, material requirements, vibrating screen model, etc. If we cannot make a choice, we can consult the manufacturer.

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.