Measures to prevent noise from bearing cage of coal mining machine
Release time:
2021-08-20
The sound source of the raceway is caused by the natural vibration of the ring after being loaded. Because of the elastic contact between the ring and the rolling element, a nonlinear vibration system is formed. When the lubrication or machining accuracy is not high, the natural vibration related to this elastic characteristic will be excited, and it will become noise when it is transmitted to the air. As we all know, even if the bearing parts are processed with modern super manufacturing technology, there will always be small geometric errors of varying degrees on the working surface, so that small fluctuations between the raceway and the rolling elements will excite the natural vibration of the vibration system. Although it is unavoidable, high-precision machining of the working surface of the parts can be used, the correct selection of bearings and the precise use of bearings to reduce noise and vibration.
The squeal of the special bearing for coal mining is a very violent squeal caused by the sliding friction between metals. Although the temperature rise of the bearing at this time is not high, it has little effect on the life of the bearing and the life of the grease, and does not affect the rotation, but it is unpleasant. The noise is disturbing, especially large short cylindrical roller bearings bearing radial load often have this noise, which is characterized by: a. It is easy to produce when the bearing radial clearance is large. b. It usually appears in grease lubrication, but oil lubrication is rare. c. Decrease as the size of the bearing increases, and it often appears in a certain speed range. d. It often appears in winter. e. Its appearance is irregular and unpredictable, and it is related to the amount and performance of grease filling and installation and operation conditions. This noise can be prevented by reducing the radial clearance of the bearing and adopting a shallow outer ring raceway structure.
The free vibration of the cage during the bearing rotation and its collision with rolling elements or ferrules will cause this noise. It may appear in all kinds of bearings, but its sound pressure level is not too high and low frequency. Its characteristics are: a. Both stamping cages and plastic cages can be produced. b. Either thin oil or grease lubrication will appear. c. It is easy to happen when the outer ring bears the bending moment. d. It is easy to appear when the radial clearance is large.
Since the cage pocket gap and cage and ring gap are inevitable in the bearing product, it is very difficult to completely eliminate the cage sound, but it can be improved by reducing the assembly error and optimizing the reasonable clearance and cage movement. .
Another kind of special noise of the cage is the noise caused by the self-excited vibration of the cage caused by the friction between the cage and the guide surface of other bearing parts. The stamped cage of deep groove ball bearings is thinner, the bending stiffness in the radial and axial planes is low, and the overall stability is poor. When the bearing rotates at high speed, it will produce self-excited vibration due to bending deformation, causing "buzzing" .
When the bearing is under radial load and the grease performance is poor, the noise of "click, click" will be heard at the beginning of operation. This is mainly due to the sudden acceleration of the rolling elements and the phase of the cage after the rolling elements leave the load zone. The noise from the collision is inevitable but will disappear after a period of operation.
The measures to prevent cage noise are as follows:
a. In order to make the cage revolving movement stable, the ring guide method should be adopted as far as possible and the guide surface should be fully lubricated. The structure of the tapered roller bearing under high-speed working conditions should be improved, and the roller-guided L-shaped cage should be changed. Z-type cage guided by the collar ribs.
B. When the bearing rotates at high speed, the vibration amplitude of the cage of a bearing with a large pocket gap is much greater than that of a cage with a small pocket gap, so the value of the pocket gap is particularly important.
C. Pay attention to minimize the radial clearance.
D. Try to improve the manufacturing precision of the holding price and improve the surface quality of the cage, which is beneficial to reduce the noise caused by the collision or friction between the rolling elements and the cage.
E. Actively adopt advanced cleaning technology to effectively and thoroughly clean the spare parts and the products after fitting to improve the cleanliness of the bearing.
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