As a commonly used screening equipment in the mining industry, the vibrating screen is in a long-term working state and the operation is also a fine operation, so there will be more or less problems. If the feeding is too slow, it will affect the screening efficiency of the vibrating screen. The reasons for the slow feeding of the vibrating screen and the adjustment methods have been introduced in detail below. Let’s take a look.

The reason why the vibrating screen feeds slowly

1. Vibration motor problem

(1) The motor power cannot reach or the motor power is normal but the speed is slow, and the 1500 rpm that cannot be used will also cause the feeding to be slow.

(2) The steering problem of the vibration motor: the steering of the motor is divided into two types: forward rotation and reverse rotation. Under normal circumstances, the steering of the two motors is in the opposite direction, but if the user connects the positive and negative poles incorrectly when the power is connected, it will cause When the motor rotates in the same direction, there will be a problem of slow or no material feeding on the screen surface.

(3) The problem of the installation position of the motor: There are three installation positions of the vibrating motor of the linear screen, which are the bottom, the two sides, and the upper part. If the vibration motor is installed close to the feeding port, the screen surface material will run for a certain distance and then the speed will decrease and stay on the screen surface.

2. The amount of screen cloth is too large

The excessive amount of cloth on the screen surface is also the reason for the slow feeding of the vibrating screen. When the screen is added, the load of the motor is also added accordingly, and there will be a problem of slow feeding.

3. The discharge port is higher than the screen surface

If the discharge port is higher than the screen surface, the material cannot be discharged from the discharge port in time, which will cause the material in the screen machine to stagnate on the screen surface and not discharge, thus causing the problem of slow feeding of the linear vibrating screen.

4. Screen box problem

(1) The screen box of the vibrating screen should be installed horizontally on the same horizontal plane. If the horizontal level of the screen box is not balanced, the screen surface will be offset to a certain extent, and the material cannot flow in a straight line;

(2) When the rigidity of the support spring of the screen box is too large, it is easy for the material to be subjected to excessive excitation force, resulting in violent vibration. If the support spring is damaged, it will also cause uneven force on the material and abnormal flow.

5. Other reasons

Voltage instability will reduce the efficiency of the motor and cause the problem of slow feeding; when the vibrating screen feeds unevenly, the material cannot be subjected to a uniform exciting force, so it will also lead to the phenomenon of slow material flow on the screen surface of the linear vibrating screen; vibration After the screen of the screen is damaged for a long time, the material will not flow normally on the screen surface.

The above are the reasons for the slow feeding of the vibrating screen. The specific reasons are the problem of the vibrating motor, the large amount of cloth on the screen surface, the discharge port is higher than the height of the screen surface, etc. The slow feeding can be adjusted by adjusting the motor and changing the angle of the heavy hammer.

When we find that the vibrating screen equipment has the problem of slow feeding, we must find out the reason in time to better solve the problem. It is also necessary to maintain the equipment on a daily basis, so as to prevent the equipment from malfunctioning.

In daily production, during the use of the vibrating screen, a relatively obvious material conveying is suddenly not smooth, followed by the problem that the discharge is biased in a certain direction. To solve this problem, we must first find out the reason for the deviation of the material, and then find out how to solve the problem of the deviation of the vibrating screen. In response to the above problems, the vibrating screen manufacturer gave us a detailed introduction.

The reason for the deviation of the vibrating screen

1. The vibrating screen has a long working time

The vibrating screen has a large workload and a long working life. For a large linear vibrating screen, due to its heavy weight, if coupled with repeated vibration and strong inertia for many years, some parts of the body will be loose, which will lead to vibration. The angle of the motor changes, so the phenomenon of discharge deviation occurs.

2. Uneven feeding

If the vibrating screen is feeding more or less, it is easy to cause unstable screening accuracy, and because of the more or less material, the force deviation of the material is large, and there is a problem that the discharge is biased to one side.

3. Exciter installation problem

The transportation and screening of materials by the vibrating screen is pushed by the vibration exciter to the material with a fixed magnitude of excitation force in a designed fixed direction. Therefore, if the material conveying is not good, it can basically be judged as a vibration exciter. There is a problem with the installation angle. Under normal circumstances, the manufacturer will perform precise installation, testing, and adjustment before the equipment leaves the factory to avoid the deviation of the excitation force direction, so this problem is generally not the cause of the new machine.

4. The weight error of the screen body itself is large

The weight error of the vibrating screen body itself is large, and the position of the center of gravity is not accurate. Usually, this kind of problem does not exist in regular manufacturers, but now the market is chaotic, some manufacturers sell inferior imitation vibrating screens at abnormal market prices, although the appearance is the same, but in fact there is no technical content.

5. Inconsistent damping spring stiffness

The stiffness of the damping spring is inconsistent, and if damaged, it will also cause the vibrating screen to discharge. The importance of the damping spring to the vibrating screen is no less than that of the vibrating motor. If the quality of the shock-absorbing spring does not meet the market requirements, it will inevitably cause a series of production problems.

6. Changes in the position of the spring support

The change of the installation base plane and the position of the spring support will cause the discharge of the vibrating screen to be biased. In addition to the vibration exciter providing the main screening source power to the vibrating screen, the vibration damping spring, bouncing ball, sealing rubber ring, etc., which exist due to shock absorption, also affect the vibrating screen force and the vibrating screen more or less. The level of the body is stable. If a certain part has problems such as aging, it will be caused by the uneven screen surface and the instability of the screen machine, which will cause the problem of deviation of the discharge direction. The problem is greatly reduced, so regular inspection and maintenance are particularly important.

7. Screen box deformation

The screen box refers to the screen above the exciter and below the feeding port, which is composed of the screen frame and the screen surface fixed around it. When the vibrating screen is working normally, especially the large-scale and high-frequency equipment, the screen frame needs both the gravity of the bulk screening material and the strong excitation force of the vibrating motor. If the strength is not enough, it is easy to cause deformation and damage. , The large-scale mining vibrating screen needs to pay special attention to this problem.

The solution to the deviation of the vibrating screen

1. If the working time of the vibrating screen equipment is too long, the equipment must be maintained regularly.

2. The feeding should be uniform and continuous.

3. Reinstall the exciter and adjust the position of the exciter correctly.

4. Users should shop around and choose carefully.

5. The strength of the screen box requires not only high-quality consumables, but also a unique welding process and additional stable design.

The above is about the reasons for the deviation of the vibrating screen and the corresponding solutions. In fact, it can be seen from the reasons that to solve the problem of the deviation of the discharge, the main thing is the regular maintenance of the vibrating screen equipment, uniform feeding, etc., and at the same time when choosing When selecting equipment, choose high-quality vibrating screen equipment produced by regular manufacturers.

In mining operations, vibrating screen is one of the screening equipment that is often used. Nowadays, most of the vibrating screens on the market are linear vibrating screens and circular vibrating screens. These two types of vibrating screens can also be divided into various types according to the screening materials, usage scenarios and output. The output corresponding to the model is basically different. Therefore, the understanding of the vibrating screen model can be directly started from the circular vibrating screen and the linear vibrating screen.

1. Circular vibrating screen

The circular vibrating screen, as the name implies, has a circular running track. Therefore, when the material is screened on the circular vibrating screen, it performs circular motion, which is a new type of multi-layer vibrating screen. Circular vibrating screen is often used in quarries to screen sand and gravel materials due to its fast screening speed, high work efficiency, simple structure, reliable operation and low noise, and of course it can also be used in coal preparation, mineral processing and other industries.

YK series is the most commonly used circular vibrating screen at present. The circular vibrating screen of this series is named according to the number of screen layers and screen size, such as 2YK1548. The motion trajectory is similar to a circle, 15 represents the width of the screen, and 48 represents the length of the screen. Therefore, the meaning of this model refers to a two-layer circular vibrating screen with a screen width of 1500mm and a length of 4800mm. Generally, several layers of sieves can produce several kinds of finished products, and the top layer is the return material.

The processing capacity of YK series circular vibrating screen is between 12-720m/h. The larger the model number, the wider the screen width and the longer the length, and the higher the vibrating screen output. The mesh size of the screen can be determined according to the feeding size of the screening material.

Commonly used circular vibrating screen models:

2YK1230, 2-layer screen, the screen area is 7.2㎡, and the processing capacity is 12-78m/h;

3YK1230, 3-layer screen, the screen area is 10.8㎡, and the processing capacity is 13-80m/h;

2YK1237, 2-layer screen, the screen area is 8.88㎡, and the processing capacity is 15-86m/h;

3YK1237, 3-layer screen, the screen area is 13.32㎡, and the processing capacity is 16-90m/h;

2YK1548, 2-layer screen, the screen area is 14.4㎡, and the processing capacity is 22.5-162m/h;

3YK1548, 3-layer screen, the screen area is 21.6㎡, and the processing capacity is 22.5-162m/h;

4YK1548, 4-layer screen, the screen area is 28.8㎡, and the processing capacity is 22.5-162m/h.

2. Linear vibrating screen

The characteristics of the linear vibrating screen are high efficiency, simple structure, convenient maintenance, low power consumption, and no dust spillage during operation. It has good screening effect in dry and wet classification and dehydration of medium and fine materials. Therefore, this type of vibrating screen is widely used in light industry, metallurgy, coal and other industries.

When the linear vibrating screen is working, its power source is the vibration of the vibration motor. Under the combined action of the material’s own gravity and the exciting force, the material is thrown up on the screen surface and moves forward in a straight line, and then is screened out through the screen. Various specifications of materials, different specifications of materials, corresponding to different specifications of the discharge port.

The processing capacity of the linear vibrating screen is generally between 10-600t/h, the feeding particle size is not more than 300mm, the screening particle size is relatively fine, and the maximum screening mesh number is 400 mesh, which can screen out 7 kinds of materials with different particle sizes.

Commonly used linear vibrating screen models:

ZSG1237, 1-layer screen surface, the processing capacity is 10-100t/h, and the total weight is 2250kg;

2ZSG1237, 2-layer screen surface, the processing capacity is 10-100t/h, and the total weight is 3345kg;

ZSG1443, 1-layer screen surface, the processing capacity is 10-150t/h, and the total weight is 4100kg;

2ZSG1443, 2-layer screen surface, the processing capacity is 10-150t/h, and the total weight is 4900kg;

3ZSG1443, 3-layer screen surface, the processing capacity is 10-150t/h, and the total weight is 5870kg;

2ZSG1548, 2-layer screen surface, the processing capacity is 15-200t/h, and the total weight is 5836kg;

3ZSG1548, 3-layer screen surface, the processing capacity is 15-200t/h, and the total weight is 6900kg.

The linear vibrating screen is generated by the double motor to generate the exciting force, so that the material is thrown up on the screen and moves forward in a straight line. It is mostly used for small mining or the screening of finer materials. The circular vibrating screen uses an eccentric block as the exciting force (its exciting force is relatively strong), and then performs circular motion, which is suitable for large-scale mining or screening of large materials. Generally, it is used to process materials of about 5mm. Compared with the linear vibrating screen, the efficiency will be higher.

The above content is the relevant introduction of the vibrating screen model. I hope it can be helpful to you. If you need to know more about the vibrating screen, or intend to purchase vibrating screen products, you are welcome to log in to our official website to browse and consult, and look forward to cooperating with you !

In the mine production site, vibrating screen is a common equipment, which needs to screen and dehydrate materials. Since it is a large-scale equipment and the workload of the equipment is large, the maintenance work of the vibrating screen should be done well at ordinary times, and the lubrication and maintenance can ensure the normal production and operation of the vibrating screen. So what kind of lubrication is used for the vibrating screen? Generally, there are two types of lubrication, oil lubrication and grease lubrication. The following editors from Hiside will give you a detailed introduction.

1. Lubrication method of vibrating screen

Oil lubrication of vibrating screen

Lubricating oil has strong fluidity and dispersibility, so the oil-lubricated seal needs to be safe and reliable. The sealing device is more complicated than grease lubrication, and it is more difficult to disassemble and maintain. Oil lubrication is generally suitable for bearings operating at high speeds or in environments with high bearing temperatures. Commonly used oil lubrication methods include oil bath lubrication, circulating oil lubrication, drip oil lubrication, oil injection lubrication, and oil and gas lubrication.

Grease lubrication of vibrating screen

Grease has the characteristics of strong adhesion, not easy to run off, and good pressure resistance. Due to the weak fluidity of the grease, the grease lubricated sealing device is relatively simple, the disassembly and maintenance are more convenient, and a special oil supply system is not required. Grease lubrication is generally suitable for work in low and medium speed and moderate temperature environments. Commonly used greases are calcium-based grease, sodium-based grease, aluminum-based grease, general-purpose lithium-based grease, extreme-pressure lithium-based grease and molybdenum disulfide extreme-pressure lithium-based grease.

2. Characteristics of vibrating screen lubrication method

Characteristics of oil lubrication of vibrating screen

Name	Features and uses
Oil bath lubrication	The rotation of the bearing itself is used to drive the lubricating oil to lubricate the bearing, and the lubricated lubricating oil flows back to the oil tank: but this lubrication needs to control the oil amount. In general, the upper height of the lubricating oil is slightly lower than the center line of the bearing: too much oil , The increase of bearing resistance causes the bearing to heat up, the oil amount is too small, and the lubrication effect is not achieved, thereby reducing the bearing service life: it is mainly used in bearings with low and medium speeds, and has a wide range of applications.
Circulating oil lubrication	The oil inlet and outlet are provided on the seat. When the bearing is running, the oil pump is used to pump the lubricating oil from the oil inlet to the bearing, and the oil flowing out of the oil outlet is filtered and cooled. This method not only lubricates the bearing It also plays a role in cooling and cooling; it is generally used in bearings with high speed.
Drip lubrication	The lubricating oil is dripped onto the friction pair by its own weight, generally 3-8 seconds a drop is appropriate, because too much oil will cause the bearing temperature to increase; this lubrication is mostly used for gears, racks and other frictions that are small in number and easy to approach On the pair and bearing parts that require a quantitative supply of lubricating oil.
Oil injection lubrication	The high-pressure injection method is used to spray lubricating oil from one end of the bearing into the bearing to lubricate it, and the lubricated oil flows into the oil tank from the other end; this method can effectively lubricate the bearing, but the position of the high-pressure nozzle and the injection speed have certain It is required that the high-pressure nozzle is located between the inner ring and the cage, the injection speed is greater than 15 meters per second, and the lubricating oil is directly injected into the bearing; this lubrication is suitable for high-speed running bearings with medium and low loads.
Oil-air lubrication	The compressed air is mixed with a little lubricating oil to form oil mist and sprayed into the bearing in the working state; this method also plays a role in cooling and cooling while lubricating the bearing. Compared with other lubrication methods, it can make it run at a lower temperature and allow the bearing speed to reach up. This lubrication is suitable for bearings under high speed, high temperature and heavy load work.

Characteristics of grease lubrication of vibrating screen

Name	Features and uses
Calcium based grease	Good water resistance, poor heat resistance. The operating temperature is less than 60 degrees, and the shear resistance is poor under high-speed conditions. It is suitable for low temperature, medium and low load, medium and low speed humid environment or lubricating places in contact with water, and the price is low.
Sodium Grease	Poor water resistance, average heat resistance and rust resistance, suitable for lubricating low-speed, medium-load mechanical equipment in the temperature range of -10 to 100 degrees, not suitable for lubricating parts in contact with water, and the price is low.
Aluminum base grease	It has high water resistance and poor heat resistance, and the operating temperature is less than 50 degrees. It is suitable for corrosion protection of metal surfaces and friction parts of shipping machines under medium and high loads and low speeds. The price is low.
General Purpose Lithium Grease	It has good water resistance, heat resistance, mechanical stability, corrosion resistance and oxidation stability. It is suitable for the lubrication of rolling bearings and sliding bearings and other friction parts of various mechanical equipment within the working temperature range of -20 to 120 degrees. It is mostly used under medium and high load and medium and low speed. fair price.
Lithium grease	It has good heat resistance, water resistance, rust resistance, and extreme pressure performance. It is suitable for high-load, medium-speed mechanical equipment bearings and gear lubrication at a working temperature of -20 to 120 degrees. It can also be used in centralized lubrication systems. Moderate.
Lithium Molybdenum Disulfide Grease	It is suitable for the lubrication of heavy-duty gears and bearings such as internal rolling steel machinery, mining machinery, and heavy lifting machinery with a working temperature of -10 to 120 degrees.

3. Comparison of vibrating screen lubrication methods

Compare items	oil lubrication	Grease lubrication
Sealing means	More complicated, need to pay attention to maintenance	Simple
Lubrication performance	very good	good
Rotating speed	Also available for high speed	low speed medium speed
torque	smaller	bigger
Lubricant replacement	Simple	more troublesome
Lubricant life	long	shorter
cooling effect	Good (requires loop)	none
Filtration of impurities	easy	difficulty
leakage of lubricant	Not suitable for places where oil leakage is not allowed	Less oil spill pollution

4. Precautions for vibrating screen lubrication

(1) After the vibrating screen is delivered to the site, it should be refueled every four hours after starting up. The vibration exciter bearing is lubricated, and the bearing is made of lubricating grease, which should not be mixed with other varieties. When replacing new grease, the original grease should be cleaned.​​

(2) After starting production, add oil every 24 hours, 60-80g oil each time; also add grease according to the actual situation to ensure that the screen bearing works under the condition of sufficient grease.​​

(3) The initial oil filling of the bearing is 1/3-2/3 of the bearing space, and it should not be too much to prevent the bearing from heating. Use a high-pressure oil gun or oil pump to inject oil through the pipe joint.​​

(4) Remove the bearing and clean it every six months.​​

(5) All lubrication points and oil seals must not have oil leakage.

The above is the answer to what kind of lubrication is used for the vibrating screen. In order to make the bearing function fully, it is necessary to adopt appropriate lubrication methods and lubricants according to the influencing factors of the use environment, in order to achieve good lubrication protection effect. Lubrication affects the working state of the vibrating screen equipment to a large extent, so it is very important to do the lubrication and maintenance work for each part of the vibrating screen.

Linear vibrating screen structure and functional description of each part, linear vibrating screen is mainly composed of screen box, screen frame, screen mesh, vibrating motor, motor base, vibration damping spring, bracket, etc. The following vibrating screen manufacturers will introduce each linear vibrating screen in detail Parts composition, installation, use and maintenance work.

Structural composition of linear vibrating screen

1. Screen box: It is welded by several steel plates of different thicknesses. It has certain strength and rigidity and is the main part of the screening machine.

2. Screen frame: made of pine or wood with small deformation, it is mainly used to keep the screen flat and achieve normal screening.

3. Screen: There are several kinds of screens such as low carbon steel, brass, bronze, stainless steel wire.

4. Vibration motor (please refer to the vibration motor operation manual for operation and maintenance methods).

5. Motor base: install the vibration motor. Before use, the connecting screw must be tightened, especially three days before the trial of the new mesh screen machine, it must be tightened repeatedly to avoid accidents caused by loosening.

6. Damping spring: prevent vibration from being transmitted to the ground and support the overall weight of the screen box. When installed, the spring must be perpendicular to the ground.

7. Support: It consists of four columns and two channel steels to support the screen box. When installing, the columns must be perpendicular to the ground, and the channels under the two columns should be parallel to each other.

Preparations for installing linear vibrating screen

1. Check whether the motor logo meets the requirements.

2. Measure the insulation resistance with a 500-volt megger, and dry the stator winding at a temperature not exceeding 120.

3. Check the motor fasteners and beware of loosening.

4. Check whether the motor surface is damaged or deformed.

5. Check whether the rotation is flexible. If there is any abnormality, it should be excluded.

6. Check whether the power supply is out of phase, and run for 5 minutes with no load.

Installation and adjustment of linear vibrating screen

1. The motor should be fastened on the installation surface, and the installation surface must be smooth and flat.

2. The motor can be installed horizontally.

3. The motor lead adopts four-core rubber cable YZ-500V. When connecting the power supply, the lead wire is not allowed to bend sharply, and it must be securely fixed with the vibrating body.

4. The motor should have reliable grounding, the motor should have a grounding device, the lead terminals should be marked, and grounded with anchor bolts.

5. Adjustment of exciting force.

The use and maintenance of linear vibrating screen

1. This machine should be equipped with electrical protection devices.

2. During the initial operation of the machine, check the anchor bolts at least once a day to prevent loosening.

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

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

5. After the machine has been running for 1500 hours, check the bearing and replace it immediately if it is seriously damaged.

6. When the machine is stopped for a long time and used again, the insulation resistance should be measured. For the measurement of a 500-volt megger, the insulation resistance should be greater than 0.5 megohm.

Daily maintenance of linear vibrating screen

1. Before starting: (1) Check whether the coarse net and fine net are damaged; (2) Check whether the transport bracket is removed.

2. When starting: (1) Pay attention to whether there is abnormal noise (2) Whether the current is stable (3) Whether the vibration is abnormal.

3. After use: Clean up after each use. Regular maintenance. Check whether the coarse mesh, fine mesh and spring are damaged by fatigue, and whether various parts of the fuselage are damaged by vibration. Parts that need to be lubricated must be lubricated with oil.

Installation, commissioning and trial operation of linear vibrating screen

1. Installation: Before installing the machine, first check whether the parts are complete and damaged according to the packing list; the equipment should be installed according to the installation drawing, and the foundation should have sufficient rigidity and strength to support all dynamic and static loads.

2. Adjustment and trial operation: the spring must be in a vertical state, and the contact surface between the upper spring bracket and the spring must be in a horizontal state. After adjustment, fix the upper spring bracket on the trunnion of the screen box with bolts, and then weld into one; the no-load test run time shall not be less than 2 hours. After the no-load trial operation is qualified, it can be put into the load trial operation, and the load trial operation can be carried out according to the technical trial operation requirements.

The above is a detailed introduction to the installation and debugging of the vibrating screen. The linear vibrating screen has high screening accuracy, large processing capacity, simple structure, low energy consumption, low noise, long service life of the screen, good sealing, very little dust spillage, Features such as convenient maintenance are widely used in automated operations in assembly line production. If you have any questions during use, look forward to your letter of consultation.