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Oscillating screen rolling bearings affect several reasons for oscillation
Source: China Bearing Network Time: 2013-03-14
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Factors affecting the oscillation of the oscillating screen rolling bearing.
5. Exciter for conflict and smooth oscillation screening; mostly for the painful shaft exciter and box exciter. The painful shaft exciter device is easy to adjust; but the cost is higher; and the pain is not adjusted, the box type The 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.
2. The bearing precision of the outer ring and the support hole will affect the transmission of the oscillation; tighter cooperation will force the raceway deformation; increase the shape error; cause the oscillation to add. The outer ring and the (bearing seat) support hole have a large difference in the nature of the data. In particular, a rubber damping ring is placed between them; it can be transmitted by oscillating oscillation. The looser cooperation can make the oil film in the gap have a damping effect.
1. It hurts to oscillate 3 . The bearing radial clearance oscillation screen has a large excitation force; the bearing receives a large radial force; then the intense oscillation occurs. The waviness of the raceway, especially the tumble surface, has the greatest influence on the oscillation of the bearing; the rolling body and the cage and The gaps in the surface of the ring and the relative movement of the ring will cause the bearing to oscillate; this is because the spin frequency of the roll body is higher; the work appearance is touched with the raceway; the roll, the ring, the cage are attacked. The oscillating size is roughly 4:3:1. Therefore, the downward bearing oscillation should first improve the external machining accuracy of the tumbling body. The higher the bearing precision; the smaller the oscillation.
The bearing is the primary source of oscillation for the oscillating screen; it is operated by a large amount of encouragement; therefore, the bearing is subjected to large radial forces; the oscillating screen is in operation; large excitation The force will incur the 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. The tactical swimming 缌 four 晃 晃 晃 徊 徊Hey.
If the radial clearance is too large or too small, the bearing system will have a large oscillation. Therefore, the radial clearance will cause the bearing to oscillate in the passband. The experimental results of the oscillating screen bearing are indicated; the radial clearance is too large. The radial natural frequency of the elastic system of the descending bearing; simple episode resonance; the occurrence of large low-frequency oscillations; at the initial stage of the impact; the high-frequency squeezing waves that are unrelated to the mechanical mass and the shape of the object; and the inside of the metal, but in the later stage of the impact; A mechanical oscillation is caused by mechanical force that is lower than the frequency of the impact tightening wave. This is because a large acceleration occurs at the impact point of the rolling element and the ferrule. The radial clearance is too small to cause high-frequency oscillation; if it is too large, it causes low-frequency oscillation. .
4. The oscillating system consisting of a cooperative bearing and a migraine system can be regarded as a single degree of freedom system. Others; because of the centrifugal inertia force due to the partial pain; therefore, the tortuosity oscillation occurs; if the rotational speed is close to the critical value; then the tortuosity resonance occurs. There is a certain value of the resonant frequency with the driven axis system; if a certain excitation frequency is close to the resonant frequency; then the resonance occurs.
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.
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