在截煤机单链板式截链中，通常都是采用固定销以联接齿座与链板。固定销为一段小圆柱，一端做成一个与齿座圆孔内凸起部相应的弓形缺口，以免销在孔内转动。另一端做出一个与齿座圆孔内凹槽相应的环形凹槽，在此槽内放入一个弹簧圈，以免固定销由齿座内跑出。（图１ａ） 弹簧圈 In the cutters single-chain plate chain cut-off, usually are fixed pin to connect the seat and the chain plate. The fixing pin is a small cylinder, one end of which is made into an arc-shaped notch corresponding to the protrusion in the circular hole of the gear seat so as to prevent the pin from rotating in the hole. At the other end, an annular groove corresponding to the groove in the circular hole of the tooth seat is made, and a spring ring is put in the groove to prevent the fixing pin from running out of the tooth seat. (Figure 1a) coil