生产设备安全卫生设计总则 (GB5083-1999) 6.1.6

以操作人员的操作位置所在平面为基准，凡高度在2m之内的所有传动带、转轴、传动链、联轴节、带轮、齿轮、飞轮、链轮、电锯等外露危险零部件及危险部位，都必须设置安全防护装置。

General Rules forDesigning the Production Facilities (GB5083-1999), Article 6.1.6

With the surface where work point located as reference, iftransmission strap, rotor

shaft ,transmission chain ,coupling Member ,belt wheel, gearwheel ,fly wheel ,chain wheel and electric saw expose to danger, set the safetydevice as a must.