Kge17 type belt deviation switch is selected for belt deviation detection and protection of conveyor, which is used in pairs. It is the switch value signal; when the belt deviates, the belt side drives the sensor rod to tilt, and when the first level deviates, the control box starts to alarm; when the second level deviates, the internal switch acts, the relay fails to act, and the alarm and the belt conveyor stops immediately. After the deviation lever is reset (the tape returns to normal), the shutdown and alarm functions will stop at the same time. The deviation sensor is used to protect the upper and lower adhesive tapes, which can be protected at the same time and can be reset automatically.