The exciter vibration causes the material motion on the screen, the screen surface material goes through multi-layer screening, the material of different sizes goes through the sieve into each outlet, and the vibrating screen in the working process is frequently affected by the bearing, which causes the screen machine to vibrate vigorously.
The horizontal screen deck vibrates in a back-and-forth pattern, while the incline vibrating screen oscillates in a circle. The actual vibration might be produced in several ways. The horizontal screen has a double counterbalance mechanism. Depending on when the weights are in opposition in each revolution, the counterbalance weight will either encourage or dampen the direction of vibration.
The inclined vibrating screen employs an eccentric shaft for motion. Compared to the unbalanced flywheel method, this approach to vibration creation is preferable. An uneven flywheel will produce jarring vibrations. Because of this, mechanical breakdown and structural damage ensue.
The following factors primarily cause this:
The Friction of The Bearings and Their Lubrication
Because the bearing is the primary source of difficult-to-control vibration in a vibrating screen, and because the vibrating screen needs to rely on a significant amount of exciting force to keep the work going, the bearing will be subjected to a significant amount of radial force. When the vibrating screen is working, the enormous excitation force will cause the elastic vibration of the bearing system. If the lubrication is poor, then there will be a tremendous amount of friction, which will cause the bearing temperature to rise too quickly and too high, the thermal expansion to be too significant, the radial clearance to be significantly reduced, and then the temperature of the friction to increase even more.
Bearing Correctness in Terms of Geometry
If the vibrating screen’s excitation force is too great, this will cause the bearing to experience a significant amount of radial force, ultimately resulting in a powerful shock. The precision of the bearing has a direct correlation to how much vibration there is.
Vibration Through Eccentric Oscillation of The Exciter
Since this is the cause of the vibration exciter, the eccentric weight has been raised, and the amplitude has been adjusted. In the case of motor vibration, for example, the amplitude of the eccentric block angle on the ends of the shaft may be adjusted to modify the magnitude of the exciting force. A minor angle results in a more significant increase in the vibration amplitude. On the contrary, the angle becomes big, exciting force’s small amplitude becomes smaller. To raise or reduce the amplitude of the vibrating screen machine, the eccentric vibrator shaft is increased, increasing the flywheel and the counterweight belt wheel.
The Supporting Hole Is an Outer Ring
The vibration transmission will be affected by how the supporting hole and the outer ring are matched. If the fit is too snug, the raceway will be pushed to flex, the shape error will be increased, and the shock will be increased. A loose fit might cause the oil film in the gap to become less effective.
Clearance At the Bearing’s Radial Surfaces
The bearing tests performed on the vibrating screen demonstrate that if the radial clearance is too little or too big, the bearings will generate a substantial vibration in the system. Vibrations of a higher frequency can be caused when the radial clearance is too narrow, whereas vibrations of a lower frequency will be caused when the radial clearance is too excellent.
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