The full name of the flat arc tooth ring is the flat link for mining ring chain, which is a new type of arc tooth link. The top circle and root circle of the chain link adopt the same circle and non concentric structure. When the chain is subject to the torsional moment, it has the self-locking function. The arc tooth has a large transition fillet, so that the tooth will not be broken due to stress concentration.

1、 Forced failure in case of sudden overload.

This kind of situation will not appear under normal working condition. Only when the chain is impacted suddenly, the link may be damaged due to sudden overload. When the coal mining machinery is working in the underground, this kind of situation occurs from time to time (for example, the coal plough suddenly gets stuck in operation, etc.). If the safety element on the equipment fails, this situation will be more serious.

2、 Fatigue failure caused by random load.

The damage of the link is far below the breaking load, which is the main situation of the link damage at present. Under the action of fatigue load, some stress sensitive parts of the link crack and gradually expand, resulting in brittle fracture. Therefore, the effect of fatigue load is the main reason that the breaking strength of the link is greatly reduced. Therefore, the main purpose of this paper is to improve the breaking strength and fatigue life of the link.