The vibration of bearings in vibrating screen is a problem that many customers want to solve. After analyzing the factors affect the bearing vibration and research about the bearings, we find out some solutions to reduce the bearings vibration. Here, we mainly introduce some control methods for bearing vibration in vibrating screen.
Properly Choose Bearings
Antifriction bearings are bought-in components for most of the vibrating screen manufacturers and customers. So in the design process of vibrating screen, how to properly choose type and physical dimension of bearings is a very important factor to reduce the vibration of bearings in vibrating screen. In order to reduce the vibration of bearings, generally we should adopt bearings with good rigidity and high vibration resistance. And as we know, the radial rigidity of needle bearing is much higher than ball bearing. But the geometric accuracy and assembly quality of needle bearing and its components are very sensitive. On the contrary, the deep groove ball bearing has poor rigidity and it is not sensitive to the assembly quality. So from the aspect of reducing the vibration of bearings, deep groove ball bearing is more proper. But for fulcrum bearing with high requirements about the rigidity, such as large scaled vibrating screen, we should adopt tapered roller bearing. For vibrating screen with large load, serious impact and oscillating load, we can adopt spherical roller bearing.
Good lubrication also means a lot for the reduction of bearing vibration in vibrating screen. Good lubrication of bearings can improve the frictional behavior of rolling elements, raceway and retainer. But we should control the adding volume of lubricating grease or lubricating oil and adopt proper lubricating method. Too much lubricating oil will cause the agitation of lubricating oil in bearings when the bearings rotate with high speed, inducing contact resonance.
Determine The Coordination Between Bearings And Related Spare Parts Properly
The coordination of outer ring in the bearing hole directly affects the vibration of bearings in vibrating screen. If the coordination is too tight, it not only directly improves the transmission of vibration but also will force the raceway deforms and affects the form error of raceway. In this case, the radial internal clearance will decrease, causing the vibration increase. So the coordination of outer ring and bearing hole should properly loosen.
Proper coordination can make the oil film at contact of bearing and bearing hole produce damping to the vibration of outer ring. But too loose outer ring coordination will also cause the vibration of bearing. The harshness and allowable error of bearing journal that coordinates with the inner ring bearing should strictly meet the accuracy requirement. If we do not follow the rules and install antifriction bearing on the journal too tight, then even the bearings have high accuracy, the deviation of journal will inevitably transmit to the inner ring. And in this process, it will also cause strong vibration of bearings. So to reduce this kind of vibration, besides controlling the manufacturing accuracy of bearings, we should also pay attention to the process of journal and the control of magnitude while assemble.
Adopt damping process between the inner and outer ring of bearing. The rolling element of bearing can be made into hollow rolling element or add damping material inside the rolling element can also reduce the vibration of bearings.
Improve The Rigidity Of Bearing Seat
The rigidity of bearing seat has great influence on the vibration of bearings in vibrating screen, so improve the rigidity of bearing seat can reduce the vibration f bearings. When the rotation speed is fixed, the vibration peak value of bearing reduces along with the increasing of thickness of wall. So by changing the axial thickness and its shape and increasing the rigidity of bearing seat, we can reduce the vibration of bearing.