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The speed of universal joint of rolling mill is inconsistent.
What you want to ask is the reason why the speed of universal joint of rolling mill is inconsistent? The reason for this is the following:

1. Transmission system failure: the looseness and wear of the drive belt and transmission shaft make the universal joint speed of the rolling mill inconsistent.

2. Hydraulic system problem: the oil supply, pressure and flow of the hydraulic system are unbalanced, which affects the running speed of the hydraulic cylinders on both sides of the universal joint.