Causes and solutions of vibration of vertical roller mill machine

News Date:2020-07-02 13:42:33

Vertical mill machine is a large-scale grinding equipment commonly used in industry, whether it is grinding ore or non-metallic ore, it can achieve the effect of milling. High-efficiency and high-efficiency vertical mills have always been the pursuit of major companies. Therefore, after purchasing equipment, the operator must have a better understanding of the vertical mill than himself. For example, if the vibration problem occurs in the vertical mill, it is necessary to consider the following points:

Reasons and solutions for vibration of vertical mill machine:

vertical roller mill

The center of the combination of the grinding roller and the center bracket is offset from the center of the grinding table, which causes the vibration of the vertical mill.

Due to long-term wear and vibration, the gap of each connecting part becomes larger, the torsion bar cushion mat ages and hardens to lose the cushioning effect, and the thickness of the impact becomes thinner (each block is 125mm thick, and only 120mm is detected after a period of operation), making the grinding roller The amount of movement becomes larger, resulting in a shift in the center of the grinding roller position (if the center of the bracket is shifted larger, it can be seen from the gap of the air seal of the vertical mill grinding roller, the air seal gap on both sides is not the same). At the same time, due to vibration and wear, the position of the torsion bar and the tension bar is shifted. Not only does the torsion bar lose its protective effect, but it also has a torsion effect on the tension bar, which generates torque on the tension bar, causing increased vibration of the mill. The chassis foundation causes destructive damage, and the tension rods and tension rod bolts are easily broken.

Therefore, when the center of the combination of the grinding roller and the center bracket deviates from the center of the vetical mill grinding table, the position of the grinding roller should be adjusted so that the center of the combination of the grinding roller and the center bracket is located at the center of the grinding table.

The specific inspection and adjustment method is: put the grinding roller on the grinding table without applying any grinding pressure, the reducer pump station is in normal working state, at this time, it can be rotated by manually rotating the coupling between the reducer and the motor grinding table. After turning the grinding disc manually for one week, measure the distance between the end block of the grinding roller lining plate and the edge of the grinding disc retaining ring, the difference is within ±5mm, it can be considered that the grinding roller is in the correct position, otherwise it needs to be adjusted until it is adjusted to the correct position until.

Mill vibration caused by damage to the nitrogen bladder of the accumulator.

Due to the damage of the nitrogen bladder, the accumulator will not play a role in buffering and damping, and cannot absorb the impact of the thickness change of the grinder material layer on the hydraulic system, and the pressure oil in the hydraulic cylinder loses the buffer, resulting in continuous shock vibration At the same time, it also accelerates the damage of hydraulic cylinder seals and high-pressure hoses.In order to avoid the above-mentioned failure, the pressure in the accumulator should be regularly checked, and the capsule should be checked or replaced in time when the pressure of the nitrogen bladder is zero.

Mill vibration caused by abrasion of lining plate of grinding roller.

With the wear of the grinding roller lining plate, the thickness of the material layer on the grinding disk will also change accordingly. When this wear reaches a certain level, the thickness of the material layer will increase, the grinding capacity will decrease, the vibration value will increase, and the operation of the mill will be difficult. . Therefore, the height of the retaining ring is not a fixed value. When the feeding amount and grinding pressure are fixed, the thickness of the material layer is mainly adjusted by the height of the retaining ring.

Different material characteristics and product fineness have different heights of the retaining ring, so in the specific operation and adjustment, the height of the retaining ring and the grinding pressure must be taken into consideration. As the wear of the roller lining plate is reduced, the retaining material must be reduced in time. circle height.

Back to Top