Partial wear of the crank pin bush: The connecting rod transmits the thrust acting on the piston to the crankshaft, and converts the rotation movement of the crankshaft into the reciprocating motion of the piston. A compressor of our company frequently appears a first-stage crank pin bush for a period of time The accident of eccentric wear that damages the black gold falling off, and the direction of the eccentric wear has not changed. The analysis and treatment are mainly carried out from the following aspects. 1. Carefully inspected the clearance of the crank pin bearing, the clearance between the crosshead pin and the crosshead, the large and small head bushes of the connecting rod, the six-point clearance between the crosshead and the slide, and the ovality of the crankpin shaft, and replaced it with a new one. The cross-head pin ensures the clearance of all parts. 2. The parallelism of the big and small holes of the connecting rod was tested with special tools, and the parallelism of the cross-head pin holes with the first-stage crank pin was also tested with special tools.The parallelism does not exceed 0.02—0.03mm, which is within the allowable range. 3. The beating of the piston rod, the design value does not exceed 0.07mm/full stroke, and after the above three points are confirmed within the design range, after only 3 days of driving after repairing the unit, the crank pin still has eccentric wear, and finally found Due to the problem of the alignment of the crankshaft coupling, the deflection of the farthest end of the crankshaft is the most obvious, which causes the eccentric wear of the crankshaft pin. By realigning the coaxiality of the crankshaft and the motor and adjusting the main bearing The gap, completely solves the problem of crankshaft pin eccentric wear.