The mechanical equipment transmission part installs the protective device to be able to play the safety protection function, prevents the person to be twisted into the rotating part, today small make up to talk about in which situation needs to install. 1. Install protective devices for all shaft ends. The protective cover of rotating machinery includes the protective cover of all exposed rotating parts of rotating machinery, including coupling, transmission belt, mechanical seal and other rotating parts (or packing) of rotating machinery; 2. Install protective devices for all levers, cams, transmissions or shafts that rotate or oscillate; 3. Install protective bars (especially below the conveyor belt) and closing devices of the head and tail rollers for all conveyor belts; 4. Install protective devices for all belt drives and chain drives; 5. Install protective devices or seals for all moving parts that can be reached under normal conditions.