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Anatomy: the reason for the oscillation of the oscillating screen rolling bearing
Source: Bearing network time: 2013-03-24
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The oscillating screen is mainly used in the production of stone materials; metallurgy; refractory data; coal, etc. The oscillating screen is mainly composed of a sieve box, a vibration exciter, a suspension (or support) device and a motor, etc. The motor is passed through a V-belt; Reverse; because of the centrifugal inertial force effect of the unbalanced weight on the exciter; the sieve box is oscillated; the finished material is sieved.
The following analysis of the factors affecting the oscillation of the oscillating screen rolling bearing.
1. Oscillation oscillation <br> Vibration exciter for oscillation screening; mostly for the painful shaft exciter and box exciter. The box type vibration exciter uses a fan-shaped partial pain block with adjustable relative orientation; the adjustment of the excitation force can be completed; then the amplitude adjustable intention is reached.
The centrifugal force of the excitatory mass during the operation of the exciter makes the deviation axis meander; it causes the relative deflection of the ferrule in the bearing table; because the partial pain will cause the oscillation caused by the frequency conversion and its various harmonics; The inertial force and inertial force couple will incur the dynamic reaction force and oscillation of the bearing; damage the smooth operation of the bearing and other parts; attack high-frequency oscillation. Discussion and analysis of the analysis; when the vibration frequency of the exciter bearing and the elastic oscillation of the screen box The first order natural frequency is combined; it will incur the intense oscillation of the screen box elastomer.
An oscillating system consisting of a bearing and a painful system; can be regarded as a single degree of freedom system. The bearing active shaft and the driven shaft system both have a certain value of the resonant frequency; if a certain excitation frequency is close to the resonant frequency; then the resonance occurs. Other; because the partial pain has centrifugal inertial force; so there will be a tortuous oscillation; if the rotational speed is close to the critical value; then the tortuosity resonance.
2. The bearing has a few precisions <br> The oscillating screen has a large excitation force; the bearing receives a large radial force; then the violent oscillation occurs. The higher the bearing precision; the smaller the oscillation. The raceway, especially the undulation of the external surface of the wrinkle on the bearing The oscillation has the greatest influence; the gap between the roll body and the cage and the roll surface of the watch ring and its relative motion will cause the bearing to oscillate; this is because the spin frequency of the roll body is high; the work appearance is touched with the surface raceway; The oscillating size of the body, the ferrule and the cage is roughly 4:3:1. Therefore, the downward bearing oscillation should be the first to improve the precision of the surface of the tumbling body.
3. Radial clearance of bearing <br> If the radial clearance is too large or too small, the bearing system will have a large oscillation. The radial clearance is too small to cause high-frequency oscillation; if it is too large, it will cause low-frequency oscillation. After the oscillation of the oscillating screen bearing The experimental results indicate that the radial clearance is too large; the radial natural frequency of the elastic system of the descending bearing; the simple attack resonance; the large low-frequency oscillation occurs. This is because the impact point at the roll and the ferrule will have a large acceleration. At the beginning of the impact; the high-frequency squeezing wave that has nothing to do with the mechanical quality and the shape of the object; and the inside of the metal, but in the later stage of the impact; a mechanical oscillation that is lower than the frequency of the impact squeezing wave is caused by the mechanical force. Make the bearing increase the oscillation on the passband.
4. Cooperation <br> The
cooperation between the outer ring and the support hole will affect the transmission of the oscillation; the tight cooperation will force the deformation of the raceway; increase the shape error; induce the oscillation to add. The looser cooperation can make the oil film in the gap have a damping effect. The material properties of the (bearing) bearing hole are quite different; in particular, a rubber damping ring is placed between them;
5. Conflict and smoothness <br> Bearings are the primary source of oscillation for oscillating screens; because oscillating screens rely on great encouragement to keep the work; A large amount of exciting force will cause elastic oscillation of the bearing system. If it is smooth, it will cause a large conflict to make the bearing temperature rise too high; the thermal expansion is too large; the radial clearance is obviously reduced.晃 晃 晃 晃 徊 徊 徊.
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