the material of the large/small sprocket is ZG310-570, and the hardness of the heat-treated working tooth piece is HRC54-60. the hopper is 16Mn. the plate is stamped and welded, and the wear edge is welded with 65Mn wear-resistant strips to prolong the service life of the hopper. the chain and the hopper are connected by high-strength bolts. the chain is a sleeve roller chain with a small pitch, which meshes smoothly with the gear teeth and prolongs the service life. the material of the chain plate is 40Cr, which is precision stamped and formed, and the heat treatment hardness is HRC50~55; the material of the pin, roller and sleeve is 40Cr, and it is quenched. the safety factor of the tensile strength of the chain is not less than 20, which is suitable for starting with full load.