Linear vibrating screens are generally used in the mining industry. In mines, the production environment is usually harsh. Therefore, we usually pay great attention to the operation and maintenance of the vibrating screen. If there is bad operation and maintenance, it will have a greater impact on the vibrating screen. , Which in turn affects the overall production efficiency. Especially for the operation and maintenance of several main components of the linear vibrating screen.

Operation and maintenance of linear vibrating screen exciter

The vibrating screen exciter is the main component of the linear vibrating screen, and its operation and maintenance are mainly the adjustment of the eccentric block.

1. The magnitude of the exciting force is closely related to the movement of the sieve machine. There are 8 adjustment holes between the main block and the counterweight of the eccentric block, which are equally divided by 15°, so they can be adjusted according to 8 positions at different angles. After adjusting to a different position, the centrifugal force changes, which in turn changes the amplitude of the screen.

2. When adjusting, each vibrating screen exciter needs to be adjusted synchronously. If the adjustment position is different, the exciting force generated will be different, and the material on the screen surface will jump irregularly. Therefore, correct adjustment must be made. Especially when replacing the exciter, the positions of the adjustment holes must be consistent.

3. Perform inspection after adjustment. The two symmetrical amplitudes and directions on both sides of the screen are required to be consistent. If the amplitude of the two sides of the screen is slightly different, no more than 0.5mm is allowed, because the movement trajectory of the material is related to the uniformity of the material on the screen, and it is necessary to adjust the feed distribution in time.

4. Due to the high-speed rotation of the vibrator of the screen machine, the axial deviation and torsion effect are generated during the operation, so the lubrication of the vibrator is particularly important for the maintenance of the screen machine. According to the operating time, the oil is generally injected once a week, and the amount of grease added is generally 300-600mL. Grease uses 2# lithium-based grease in winter and 3# lithium-based grease in summer.

Operation and maintenance of linear vibrating screen coupling

The exciters on both sides of the linear vibrating screen are connected by universal couplings. When replacing, pay attention to the flatness of the joint surface of the universal coupling. The universal coupling has been dynamically balanced before it leaves the factory, and the straightness of the coupling is directly related to the amplitude of the screen.

When replacing, the eccentric block of the vibration exciter is used to sag naturally, and then the universal coupling is connected and fixed with the coupling of the vibration exciter. The difference in the position of the screw hole is adjusted by adjusting the position of the spline. One thing to note is that the length of the coupling and the length of the spline should be selected reasonably to avoid insufficient coupling length or spline jamming.

For the coupling, because it is a spline connection, the vibration exciter generates a shaft string during operation, and the spline part needs to be well lubricated. Generally, oil is injected every 1200 hours of operation.

Operation and maintenance of spring of linear vibrating screen

Each rubber buffer spring of the linear vibrating screen can be used for about 15-20 months, and the size varies with the model of the screen machine. The temperature of the equipment should not exceed 45°C during operation. When replacing the rubber spring, pay attention to the coefficient of elasticity, that is, the height of the rubber spring at the entrance of the screen is similar, and the height of the outlet is similar, so that the buffer rubber spring can be used reasonably and it is not easy to damage. Also, when replacing the rubber springs, you should pay attention to the rubber springs on the front and rear parallel lines to be replaced at the same time to avoid changes in amplitude due to the inconsistent degree of aging of the rubber springs.

Operation and maintenance of the support screen frame of the linear vibrating screen

When cracks are found in the support screen frame of the linear vibrating screen, it cannot be simply repaired by welding. Instead, a layer of steel plate should be drilled and fixed with screws. The main reason is that the stress and material of the screen surface change due to local heating during welding. Make it more fragile.

Operation and maintenance of bolts of linear vibrating screen

The operation and maintenance of the linear vibrating screen bolt is mainly to tighten it. The connecting bolts of various parts are prone to loose due to long-term vibration. They must be inspected after shutdown. The bolts used should be high-strength bolts and high-strength locknuts, coated with anti-loosening fluid, and anti-loosing disc springs should be used for reinforcement. The effect is better. In order to prevent the wear of the screen bolts, polyurethane rubber sleeves can be used to cover the easily worn parts of the bolts to avoid contact and wear with the material.

Operation and maintenance of support beam of linear vibrating screen

The support beam of the linear vibrating screen adopts seamless steel pipe as the beam, on which the dovetail slide of the fixed screen plate is welded, and the welded round flanges at both ends are connected to the screen by high-strength bolts. The beam needs to be annealed in the later stage of processing to eliminate internal stress. Improve the strength of the beam and the service life of the screen. The beam of the screen machine must be inspected after each shutdown, focusing on checking whether the support beam of the screen machine is seriously worn and aged, whether there are cracks and other damages.

Operation and maintenance of the linear vibrating screen sieve

The screen surface of the screen used in some concentrator screens is made of stainless steel. Although the investment cost is high, the use effect is better, especially in terms of abrasion resistance. The blind sieve plate bonded by stainless steel and polyurethane is used at the entrance of the sieve machine, which has higher strength. The wavy and striped screens are used in the classification of raw materials. The penetration rate of the wavy screens is better and not easy to be blocked, but the disadvantage is that the screen bars are easily broken by large pieces of raw coal, allowing large particles to enter the next-level system. It must be repaired or replaced in time after each shutdown.

Operation and maintenance of additional components of linear vibrating screen

1. The screening effect of the screen machine is related to the thickness of the material on the screen surface and the distribution on the screen surface. Therefore, a dividing plate with adjustable angle can be installed at the inlet of the screen machine, according to the particle size and feeding of the raw coal. The volume adjustment angle is used to adjust the uniformity of the screen surface material.

2. Install several water spray pipes above the screen surface of the sieve machine, and use the water pressure to increase the penetration rate and grading effect of the classification, and remove the impurities attached to the coal. The use of pressurized water on the deintermediation screen can improve the deintermediation effect and significantly reduce the media consumption.

The above is an introduction to the operation and maintenance of the main components of the linear vibrating screen, such as the adjustment of the eccentric block of the vibrating screen exciter. In addition, when lubricating the exciter, you must pay attention to distinguishing the grease. The exciter cannot use calcium-based grease. , Otherwise the exciter will heat up and lock up and cause an accident during operation. Generally, the exciter is used for about three months, and its interior is cleaned with an oil pump, and lubricating grease is refilled after cleaning.

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

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.

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.