Cause of bending and mechanical vibration of gear pump shaft

21. What are the types of mechanical rotor unbalances?

Answer: static unbalance, dynamic unbalance and mixed unbalance.

 

22. How to measure the pump shaft bending?

A:

The bending axis, can cause the unbalance of the rotor and the movement part of wear, small bearings on the v-shaped iron, large bearing on the wheel bracket, v-shaped iron or support to put a solid, again dial gauge get on table dry point to axis, and then slowly plate of oil transfer pump shaft, such as bending, a maximum and minimum per round micrometer reading,

The difference between the two readings indicates the maximum radial runout of the shaft bending, also known as wobble.

The bending of the shaft is one half of the rocking degree. The radial runout of the general shaft is not more than 0.05mm in the middle, and more than 0.02mm at both ends.

 

23. What are the three types of causes of mechanical vibration of gear oil pumps?

A: 1) Structure: caused by defects in manufacturing design;

2) Installation: mainly caused by improper assembly and maintenance;

3) Operation: due to improper operation, mechanical damage or excessive wear.

 

24. Why is the misalignment of the rotor an important reason for abnormal vibration of the rotor and early damage of the bearing?

A:

Due to installation error between the rotor and rotor, bearing after deformation, the influence of such factors as environment temperature changes, is likely to cause of the poor, the shaft of the rotor on the bad, due to the coupling of stress change, change the rotor journal and bearing the actual work position, not only changed the working state of the bearing, also reduces the rotor shafting natural frequency,

Therefore, the misalignment of the rotor is an important reason for the abnormal vibration of the rotor and early bearing damage.

 

25. What is the standard for measuring and reviewing journal ovality and taper?

Answer: the ellipticity and taper of the shaft diameter of the sliding bearing should meet the technical requirements. The heavy oil pump should not be greater than 1/1000 of the diameter.

The ellipticity and taper of the shaft diameter of the rolling bearing is not greater than 0.05mm.