The main factors that affect the vibration sieve Rolling vibration

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1. Eccentric

Most of the vibrating sieve shaker, eccentric shaft vibration exciter and box-type vibration exciter. Adjust the eccentric shaft vibration exciter is installed, but the cost is higher, and the eccentricity can not be adjusted; box-type vibration exciter eccentric block relative position adjustable fan adjust exciting force size, so as to achieve adjustable amplitude purposes.

Exciter working the centrifugal force generated by the eccentric mass of the eccentric shaft to bend, causing the relative deflection of the bearing inner and outer rings, since the eccentric will produce the vibrations caused to the rotation frequency of each order harmonic frequency, generated in operation of the inertial force and the inertia couple will cause bearing reaction forces and vibration, and destroy the smooth working condition of the bearings and other parts to produce a high-frequency vibration. Study The analysis showed that, will cause the same when the first natural frequency of the the exciter bearing vibration frequency and the sieve box elastic vibration of a strong vibration of the elastic body of the sieve box.

Bearing with eccentric system vibra tion system can be regarded as a single-degree-of-freedom system. Bearing the drive shaft and the driven shaft system there are the resonance frequency of a certain value, if a excitation frequency with the resonance frequency close to the resonance occurs. Further, since the eccentric presence of centrifugal force, it will produce bending vibration, if the rotational speed close to the threshold, then the bending resonance occurs.china ball bearing

2. Bearing geometric accuracy

Vibration sieve exciting force, radial bearings to withstand great forc e, resulting in strong vibration. The higher the precision bearings, vibration is smaller. This is because the higher the spin frequency of the rolling body raceway especially rolling surface waviness on the greatest impact, the vibration of the bearing rolling body and to maintain the gap of the rolling surface of the frame and the inner and outer rings and the relative movement will cause the vibration of the bearing , the working surface at the same time the inner and outer raceway contacts, rolling body, the ferrule holder the size of the vibration generated by a substantially 4:3:1 relationship. Lower bearing vibration should first improve the rolling body surface machining accuracy.

3. Bearing radial clearance

Radial clearance is too large too small will cause the bearing system to produce large vibration. Radial clearance is too small to cause high-frequency vibration is caused by low-frequency vibration is too large. Vibrating screen bearing the test results show, the radial clearance is too large, the lower bearing radial natural frequency of the elastic system, easy to produce resonance, resulting in a large low-frequency vibration. This is because in the rolling body and the point of impact of the ferrule will have a greater acceleration. Early in the impact, generating mechanical quality and shape of the object independent of high-frequency compression wave and descendant metal inside; rather late in the impact, a shock compression wave of low frequency mechanical vibrations generated by the mechanical force. Therefore larger cause bearing radial clearance increased vibration in the passband.ball bearing company

4 with the

The mating of the outer ring and the supporting hole will affect the transmission of vibration, a tight fit will be forced to raceway deformation, increase the shape error, cause vibration to increase. Than the loose fitting gap can film damping effect. The nature of the material of the outer ring and the supporting hole (bearing seat) larger difference, especially a rubber damping ring placed therebetween, can inhibit the transmission of vibration.

5 Friction and Lubrication

The bearing is a main source of vibration of the vibrating screen is more difficult to control, since the vibration sieve is maintained by large excitation force to work, so the bearing suffered great radial force is large, the vibrating screen in the work process, the excitation The force will cause the elastic vibration of the bearing system . If the poor lubrication, will produce a greater friction bearing temperature is too high, too large thermal expansion, so that the radial clearance is significantly reduced, which in turn exacerbate friction and to further improve the temperature rise.ball bearing supplier