The grate machine is a special crawler heat transfer device for the production process of the grate-rotary kiln pellets. It is a new product designed to adapt to the development of pellets in recent years. The function is to uniformly distribute the raw material ball on the slow-running chain shovel plate, drive the main shaft of the discharge end by the transmission device, and drive the chain device through the chain to move slowly, forming a closed slewing system up and down. The sprocket, the chain and the raft are load-bearing components, and are mounted on the upper support shaft for supporting the upper boring machine, and the upper support axle is welded and tempered. The sprocket, the chain and the sprocket are unloaded and then rotated to the lower part, and are supported by the lower support axle to the lower boring machine for continuous rotation.

     The plurality of idlers of the utility model independently use a short shaft, which solves the problem that the axial length of the plurality of idlers caused by sharing a long axis is easy to be flexed and deformed, and the rotation is easily caused. The overall smoothing of the return chain under the chain smashing machine has no deflection phenomenon and the rotation is free and flexible.