1. It is applicable to scraper conveyor, coal plough, drum shearer and other mechanical traction chains.

2. Ring chain conformity and failure analysis

A. The qualified conditions of the ring chain are: (1) tension; (2) fatigue caused by fluctuating load; (3) friction and wear between the link and the link, between the link and the sprocket, between the link and the middle plate and the groove side; (4) corrosion caused by the action of coal powder, rock powder and humid air.

B. The failure analysis of the ring chain can be divided into: (1) the load of the chain exceeds its own static breaking load, resulting in premature fracture, which mostly occurs in the defective parts of the shoulder or straight arm of the chain link, such as the crack welding heat affected zone and individual bar cracks; (2) after a period of operation, the chain has not reached the breaking load, resulting in the fracture caused by fatigue Most of the fractures occurred at the joint of straight arm and circular arc of chain link.