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Factors affecting the oscillation of the oscillating screen rolling bearing
Source: China Bearing Network Time: 2012-12-30
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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. The oscillation spectrum of the oscillation sieve is marked; when the oscillation frequency of the vibration absorber and the elastic oscillation of the screen box The natural frequency of a certain order 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.
1.2 bearing a few precision oscillation screen excitation force; inviting the bearing to accept a large radial force; then the attack is intense oscillation. The higher the bearing accuracy; the smaller the oscillation. The raceway especially the tumble of the external surface of 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 first improve the surface machining accuracy of the tumbling body. Because the undulation is between the roughness and the roundness. The shape is wrong; it is the rolling body that occurs during the grinding process; it is more difficult to control the attack; for this reason, other methods should be sought to manipulate the oscillation of the rolling body.
1.3 Bearing radial clearance The radial clearance is too large or too small to cause a large oscillation of the bearing system. The radial clearance is too small to cause high-frequency oscillation; if it is too large, it will cause low-frequency oscillation. For the large-size bearing 3E3626 The experimental results indicate that the radial clearance is too large; the radial natural frequency of the elastic system of the bearing is reduced; the simple attack resonance; the large low-frequency oscillation occurs. This is because the impact point of the rolling body and the ferrule will be larger. Acceleration. At the beginning of the impact; high-frequency squeezing waves that are unrelated to mechanical quality and shape of the object; and transmitted inside the metal, but in the later stage of the impact; mechanical vibrations that occur at a lower frequency than the impact tightening wave. Larger gaps will cause the bearing to oscillate in the passband.
The test analysis shows that the bearing radial clearance is too large, so that the bearing system has a large impact oscillation; the radial clearance is too much. The frame will also have a large radial runout as the radial gap increases;
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;
1.5 conflicts and smooth bearings are the primary source of oscillation for the oscillating screen; the oscillating screen is maintained by a large amount of encouragement; therefore, the bearing is subjected to large radial forces; the oscillating screen is in operation 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. For this reason, many oscillating screens usually use large clearance bearings such as 3E3626 and 3G36240 but because the radial clearance is too large; the radial natural frequency of the bearing system is reduced; together, the rolling body is also increased. The possibility of radial runout after the disturbance and the energy of the impact ring in the beating; then increase the oscillation value of the high frequency; the intense high frequency oscillation.
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