Coal conveying belt tearing detection device based on multi-path laser ranging

The utility model relates to a coal conveying belt tearing detection device based on multi-path laser ranging. A coal conveying belt tearing detection device based on multi-path laser ranging comprises a belt. The device further comprises a plurality of laser range finders located under the belt. The laser range finders are located on the ground, and each laser range finder emits a laser beam to the belt vertically and upwards at an interval of 10 cm; the system also comprises an alarm system which comprises a PLC and an alarm. An analog quantity input module of the PLC is electrically connected with the laser range finders, and a digital quantity output module of the PLC is connected with the alarm. According to the utility model, the laser range finders are spaced by 10cm and verticallyemit laser beams to the belt upwards, so that laser points on the bottom surface of the belt transversely cover the whole bottom surface of the belt. Each laser range finder outputs measured data at 4-20 mA and accesses an an