Chain fastening device

The utility model discloses a chain fastening device, and relates to the field of chains. The device comprises a fixing frame and a supporting part, the supporting part is located in the fixing frame, the front side of the fixing frame is movably connected with the supporting part, and the rear side of the fixing frame is detachably and fixedly connected with the supporting part. The supporting part comprises a roller, a supporting frame, a pin joint shaft and a threaded rod, the roller is movably connected into the supporting frame through the pin joint shaft, and the threaded rod is fixedly connected with the supporting frame. The chain tensioning device has the advantages that the supporting part can move along the sliding groove through the pin joint shaft, a loosened chain can be flexibly adjusted to a proper degree, and meanwhile the idler wheels can rotate along with the chain to reduce friction force. According to the utility model, the replacement and maintenance of the chain can be reduced, not only