Scraper conveyor is a kind of continuous transportation equipment which transports bulk materials by means of moving scraper chain. The scraper conveyor is mainly used for the transportation of the medium and low thick coal seam economic general mining face. The product has the characteristics of compact structure, simple, stable transmission, convenient installation and maintenance, reliable work, flexible process layout, etc.; it can not only transport horizontally, but also transport obliquely; it can be used by a single machine or multiple sets in combination. Sprocket is one of the important parts of the scraper conveyor. Its characteristics have a direct impact on the service life of the scraper conveyor. In the analysis of crocket wear, the transmission of crocket is a common traction crocket, which has a relatively large sliding motion at the meshing position. The working conditions are bad, and it will produce serious wear.

The service life of sprocket is short, which can not meet the requirements of production practice. According to the use status, processing status and manufacturing technology of sprocket, some improvement measures are put forward

(1) The original sprocket design material is 40Cr, the overall tempering hardness is hb220 ~ 250, and the tooth quenching hrc48 ~ 52. This method can not improve the wear resistance of sprocket because of the limited hardness of tooth quenching. It is suggested that the sprocket material be changed to 20CrMnTi, carburized and quenched. The hardness of the chain socket can reach over HRC60, and its wear resistance is more than 2.5 times that of 40Cr material. In this way, the service life of the sprocket can be greatly improved, the frequency of machine repair can be reduced, the productivity can be increased, and the production cost can be reduced;

(2) The shape of the original sprocket chain socket is forged directly, so the size error is large, the surface is rough, and the wear resistance is reduced. With the wide application of CNC machine tools and the reduction of processing cost, it is suggested to leave a little allowance after forging and finish machining by numerical milling to improve the dimensional accuracy and surface roughness, so as to achieve the purpose of improving wear resistance.