Chain anti-disengagement device and application

The invention provides a chain anti-disengagement device. The chain anti-disengagement device is mounted on a chain transmission mechanism. The chain anti-disengagement device comprises a holding frame and two chain wheel assemblies symmetrically arranged. The holding frame is rotationally connected with a gear of the chain transmission mechanism. Each chain wheel assembly comprises a chain wheelshaft and a chain wheel. The chain wheel shafts are rotationally connected with the holding frame. The chain wheels are fixed to the two chain wheel shafts. The two chain wheels are located on one side of the holding frame. The chain anti-disengagement device has the beneficial effects that it is guaranteed that the joint number of a chain winding-in device and the joint number of a chain winding-out device are the same all the time, a chain is tightly attached to a transmission gear all the time, even an upper chain is completely loosened, the chain cannot be disengaged from the device, and safe and reliable transmis