The Key Factors for the Normal Operation of Oscillating Screen Rolling Bearings
Source: China Bearing Network | Date: March 29, 2014
Oscillating screens are widely used in industries such as stone production, metallurgy, refractory materials, and coal processing. These machines consist of a sieve box, vibration exciter, suspension or support system, and an electric motor. The exciter's spindle rotates in reverse, creating centrifugal inertial force from unbalanced weights, which causes the sieve box to oscillate and separate the material.
1. **Vibration Exciters and Adjustment**
Vibration exciters come in two main types: pain shaft and box-type. Pain shaft exciters are easier to adjust but more expensive, while box-type exciters use fan-shaped eccentric blocks that allow for adjustable orientation and excitation force. This adjustment helps control the amplitude of the screen’s movement. However, during operation, the centrifugal force can cause misalignment of the bearing raceway, leading to dynamic reactions and potential damage to the bearing and other components.
2. **Bearing Precision and Oscillation**
Bearings with high precision tend to have less oscillation, as the surface waviness of the rolling elements significantly affects performance. The clearance between the rolling elements, cage, and raceway also plays a role. The oscillation pattern is typically 4:3:1 for the rolling element, inner ring, and cage. Improving the surface quality of the rolling elements is crucial for reducing oscillation.
3. **Radial Clearance and Oscillation**
Radial clearance is critical. If it's too small, it can lead to high-frequency oscillations, while too much clearance may result in low-frequency oscillations. Experiments show that excessive radial clearance can trigger resonance, causing large low-frequency vibrations due to impact forces between the rolling elements and raceway.
4. **Outer Ring Fit and Damping Effects**
The fit between the outer ring and the housing affects vibration transmission. A tight fit may distort the raceway and increase shape errors, while a looser fit allows for damping via oil films. Using rubber damping rings between the outer ring and housing can further reduce vibration.
5. **Friction and Smooth Operation**
Friction between the bearing and its components is a major source of oscillation. High radial forces from the vibrating screen can cause excessive friction, leading to overheating and reduced radial clearance. Maintaining smooth operation is essential for the longevity of the bearing and overall system stability.
These insights are based on experience and user feedback gathered by Zhengzhou Xinhai Machinery. The company emphasizes the importance of regular maintenance and proper care for oscillating screens and other equipment. Their product range includes jaw crushers, impact crushers, cone crushers, ball mills, rotary dryers, and oscillating screens, among others. Visitors are welcome to tour their production facilities.
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This article is linked from http://www.chinabearing.net
Please reference the China Bearing Network at http://www.chinabearing.net
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