Rack rail is a key functional element of armored face conveyors, is for the rack rail manufacturing process changed from body welding, forge welding and integral casting design to the whole forging process. Rack rail is installed in a rack rail conveyor chutes, as a mining machine supporting and guiding track, and relying on the pin tooth achieve shearer traction walking motion.

Rack rail wheel bear torque transmission, drive of shearer walking the important task is to ensure the normal work of the coal mining machine is an important part of. The pin gear service life is directly related to the work efficiency of the coal mining machine. The service life of the domestic large power shearer is not long, generally in the 1 to 3 months, research and improve the pin rail wheel strength has very important significance. Below from two aspects to consider improved pin wheel rail, to achieve the purpose of enhancing the pin rail wheel contact strength of tooth surface and tooth root bending strength. First, we of coal shearer and walking part were stress analysis, through the stress analysis to determine the pin rail wheel in working process by load and find pin rail wheel susceptible to partial load. Secondly, the tooth profile of the pin gear forming principle were analyzed. Besides, the forming principle of cycloid cycloid involute forming principle and the forming principle of basic theory.