**The Key Factors for the Normal Operation of Oscillating Screen Rolling Bearings**
Home > Bearing Knowledge > The Primary Factor for the Normal Operation of the Oscillating Screen Rolling Bearing
Source: China Bearing Network | Time: March 29, 2014
Oscillating screens are widely used in industries such as stone production, metallurgy, refractory materials, and coal. These screens consist of a sieve box, vibration exciter, suspension or support equipment, and an electric motor. The vibration exciter's spindle rotates eccentrically, creating centrifugal inertial forces from the unbalanced weights. This causes the sieve box to oscillate, allowing the material to be sieved effectively.
There are two main types of vibration exciters: the shaft-type and the box-type. Shaft-type exciters are easier to adjust but more expensive. Box-type exciters use a fan-shaped partial weight block that can be adjusted to change the excitation force and achieve variable amplitude control.
During operation, the centrifugal force from the exciter mass causes the axis to wobble, leading to relative deflection in the bearing raceway. This results in inertial forces and couples that cause dynamic reactions and vibrations in the bearing. If the vibration frequency of the bearing matches the natural frequency of the screen box, resonance can occur, leading to intense vibrations and potential damage.
An oscillating system involving the bearing and the exciter can be considered a single-degree-of-freedom system. Both the driving and driven shafts have their own resonant frequencies. If the excitation frequency is close to the resonant frequency, resonance occurs, which may lead to excessive oscillation.
High-precision bearings with minimal oscillation are essential. A larger excitation force leads to greater radial loads on the bearing, increasing the intensity of the oscillation. Higher precision reduces the oscillation. The waviness of the rolling surface has the most significant impact on bearing oscillation. The clearance between the rolling elements and the cage, as well as the motion between the raceway and the cage, contributes to oscillation. The oscillation sizes of the rolling elements, inner ring, and cage are approximately 4:3:1. Therefore, improving the surface precision of the rolling elements is crucial for reducing oscillation.
If the radial clearance of the bearing is too large or too small, it can cause significant oscillations. A small clearance may result in high-frequency oscillation, while a large clearance may lead to low-frequency oscillation. Experimental data show that excessive radial clearance can cause resonance in the elastic system, resulting in large low-frequency oscillations. This is due to high acceleration at the contact point between the rolling elements and the raceway, generating high-frequency shock waves that propagate through the metal. Later, mechanical vibrations at lower frequencies may occur. Thus, improper radial clearance can worsen the oscillation within the passband.
The fit between the outer ring and the housing also affects the transmission of oscillation. A tight fit may deform the raceway and increase shape errors, causing additional oscillation. A looser fit allows the oil film in the gap to provide damping. If there is a rubber damping ring between the outer ring and the housing, it can further reduce vibration.
Friction and smooth operation are primary sources of oscillation in oscillating screens. Due to the large forces involved, the bearings experience significant radial loads. The excitation force can cause elastic oscillation in the bearing system. If the friction is too high, it may lead to excessive heat, thermal expansion, and reduced radial clearance.
These five factors were summarized by Zhengzhou Xinhai Machinery based on accumulated experience and user feedback. Xinhai emphasizes the importance of regular maintenance to ensure stable equipment operation. Their products include jaw crushers, impact crushers, cone crushers, ball mills, oscillating screens, conveyors, and more. Visitors are welcome to tour their production base.
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Rod Seals
1. Components of piston rod seal:
Polyurethane, polyformaldehyde, rubber
2. Purpose and function of piston rod seal:
The rod seal belongs to the dynamic seal. It is the seal that moves with the piston rod. It is one of the important components on the hydraulic support.
3. Use position of piston rod seal:
Guide sleeve, piston
4. Working principle of piston rod seal:
It is used at the contact part between the guide sleeve and the outer cylinder to seal the emulsion in the outer cylinder.
5. What effects will be caused by improper use or operation of piston rod seal:
1. Improper selection of cavity support material will wear the cavity and piston rod.
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3. Improper thread guide angle of cylinder barrel and piston end wear the sealing ring.
4. The seal ring is worn due to improper installation guide angle of the seal.
5. The surface of cavity and piston rod is rough, with scratches and worn seals.
6. The outer cylinder leaks and the jack does not maintain pressure.
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