Vibrating screen is mainly used in stone production, metallurgy, refractory material, coal fields. Vibrating screen is mainly composed of a screen box, a vibration exciter, suspension (or supporting) deviceselectric motors etc.. Motor through a triangle belt driven spindle rotation, vibration exciter, due to vibration exciter unbalanced centrifugal inertia force of heavy objects, so that was vibrating screen box, complete the material screening. In this paper, introduces the influencing factors of rolling bearing vibration shaker Zhengzhou Xinhai machinery analysis.



1 eccentric vibration

Vibrator sieve through vibration, mostly for the eccentric shaft vibration exciter and box type vibrator. The eccentric shaft vibration exciter has convenient installation and adjustment, but the cost is high, and the eccentric distance could not be adjusted; box vibrator with adjustable to the relative position of the fan-shaped eccentric block, can realize the vibrating force adjustment, so as to achieve the purpose of adjustable amplitude.

Centrifugal force vibration exciter eccentric mass produced during the work of the eccentric shaft bending, leading to the relative deflection of bearing inner and outer rings, due to the eccentric vibration will occur in the rotation frequency and its first harmonic caused by, so the running of the inertia force and inertia will cause the bearing dynamic reaction force and vibration, stable working state damage to bearings and other components, to generate high-frequency vibration. The study shows that the analysis, when the vibration exciter and a screen box bearing vibration frequency of elastic vibration of a first-order natural frequency is same, will cause the strong vibration sieve box elastomer.

The composition of the vibration system of the bearing and the eccentric system, can be regarded as a single degree of freedom system. Bearing drive shaft and the driven shaft system exists a certain value of the resonance frequency, if a certain vibration frequencies close to resonance frequency, resonance occurs. In addition, due to the bias in the centrifugal force of inertia, so will produce bending vibration, if speed is close to the critical value, then bending resonance.

2 bearing geometric accuracy

Vibrating screen vibrating force, cause bearing bear large radial force, resulting in strong vibration. Bearing precision is high, the smaller the vibration. Raceway especially vibration waviness on bearing rolling body surface maximum, vibration of rolling body and the cage and the outer ring surface of rolling gap and the relative motion will cause the bearing, which is due to high frequency of the rolling body spin, the work surface with both the inner and outer raceway contact ring, rolling body, and keep the the magnitude of the vibration rack generated approximately 4:3:1 relationship. So reducing the bearing vibration should first improve the machining precision of the rolling body surface.

3 bearing radial clearance

Radial clearance is too large will cause the bearing system to generate larger vibration. The radial clearance is too small to cause high frequency vibration is too large is caused by low frequency vibration. Through the test of bearing vibration sieve results show that the radial clearance is too large, reduce the bearing radial elastic system natural frequency, easy to produce resonance, the larger low-frequency vibration. This is because at the point of impact rolling body and the ring will produce greater acceleration. In the impact of early, produce high frequency has nothing to do with the mechanical quality and shape compression wave, and sent into the inner metal; and in shock period, will be produced by mechanical force of a wave and low frequency mechanical vibration shock compression. The radial clearance of the bearings in the pass band on vibration.



4 matching

With the outer ring and the bearing hole will affect the vibration transmission, with a tight will force the rolling deformation, increase the shape error, lead to increase the vibration. A loose fit can make the oil film clearance is generated in the damping effect. The outer ring and (bearing supporting hole) material properties vary greatly, especially in the meantime placed rubber damping ring, can restrain the vibration of the transmission.



5 the friction and lubrication

Bearing is the main vibration source is difficult to control the vibration sieve, the vibrating screen is to maintain a great incentive, so the radial bearing large, vibration sieve in the work process, large vibration force caused by the elastic vibration of the bearing system. If the lubrication is bad, will have a larger friction bearing temperature rise too high, thermal expansion is too large, so that the radial clearance is significantly reduced, thereby exacerbating friction, further improve the temperature rise.

The above five points are Zhengzhou Xinhai machinery and according to the experience accumulated and vibrating screen information summary of user feedback and daily maintenance of Xinhai machinery suggested vibration sieve device users should pay attention to equipment, to ensure the stable operation of the equipment, to avoid damage to the enterprise. Zhengzhou Xinhai machinery products mainly include: PE jaw crusher, PF crusher, impact crusher, cone crusher, efficient fine crusher, ball mill, ball mill, cement lime rotary dryer, rotary kiln, vibrating screens, conveyors and other equipment. Welcome new and old customers to inspect the Xinhai production base.