Automatic tracking of lifting distance of mine hoist

The invention discloses an automatic tracking of lifting distance of a mine hoist, comprising a hardware part and a software part, the hardware part comprises two pieces of magnetic steel, sensors, a PLC and a peripheral display device; a base is provided with a bracket, and the upper part of the bracket is provided with a moving baffle plate, and an end of the moving baffle plate is provided with the sensor of a second detecting unit, and is contacted with the magnetic steel of the second detecting unit; the magnetic steel of the second detecting unit is installed at a guide groove of a rotating disk, and the guide groove is located at the edge of a speed-limiting circular disk, and the rotating disk is fixedly connected with the output shaft of a roller through a transmission mechanism, the magnetic steel of a first detecting unit is installed at the output shaft of a main electric motor, and is fixedly connected with the output shaft of the main electric motor, and the sensor of the first detecting unit is