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# Analysis on vibration factors of aligning ball Bearing during operation

2021-10-15

Bearing is the main vibration source of the vibrating screen is difficult to control, because the vibrating screen is a great excitation force to maintain the limit speed and friction coefficient of the working bearing, so the radial force of the bearing is very large, the vibrating screen in the process of working, the great excitation force will cause the elastic vibration of the bearing system.If the lubrication is poor, there will be greater friction so that the bearing temperature rise is too high, the thermal expansion is too large, so that the radial clearance is significantly reduced, so that the friction is intensified, and the temperature rise is further improved.

The locking methods of bearings are generally divided into two kinds:

1. Bearing attached to the screw

The bearing seat can be fixed by locking the tight screw on the extension part of the inner ring, and it can be locked by staring at the screw with a hex wrench.Please choose a suitable size hex wrench.

2. Bearing with fair locking sleeve

The fair locking sleeve has a concave to aligning the vibration and temperature of the ball bearing, the concave is fair to its inner hole, and the inner ring of the bearing seat also has a local fair.First, the fair sleeve is positioned on the inner ring, in the direction of rotation of the shaft, and the fair bearing sleeve is quickly turned until it is clamped, and the screw is tightly locked with a hexagonal wrench.

The vibration system composed of bearings and eccentric system can be regarded as a single degree of freedom system.Both the driving shaft and the driven shaft system of the bearing have a certain numerical resonance frequency. If a certain excitation frequency is close to the resonance frequency, resonance will occur.In addition, due to the existence of eccentric centrifugal force, bending vibration will affect the bearing life of material factors, if the speed is close to the critical value, bending resonance occurs.From peeling, indentation, rust, crack and wear will be reflected in the bearing vibration measurement, bearing vibration damage of bearing is very sensitive, so, through the use of special bearing self-aligning ball bearing vibration measuring device (such as frequency analyzer) can measure the size of the vibration, through frequency points cannot deduce the abnormal situation.Because the measured values are different due to the use conditions of bearings or sensor installation positions, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment criteria.Because the bearing even if there is slight peel damage, will also emit abnormal sound and irregular sound, so the sound detector can be distinguished, the sound detector is used to check the size and sound quality of the rolling sound of the bearing in operation, and play the role of prevention in advance.

If the oil hole can directly measure the bearing outer ring temperature, it is more appropriate.Bearing temperature, generally based on the bearing outdoor temperature can be inferred.If lubrication and installation are not appropriate, the temperature of the self-aligning ball bearing will rise sharply and abnormal high temperature will occur. At this time, it is necessary to stop running and take necessary preventive measures.Usually, the temperature of the bearing begins to rise slowly with the operation and reaches a stable state 1-2 hours later.The normal temperature of bearings varies with the heat capacity, heat loss, speed and load of the machine.When necessary, the use of heat sensor can monitor the working temperature of bearings at any time, and realize automatic alarm or stop when the temperature exceeds the specified value to prevent shaft burning accidents.

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