Automatic detection device for distance between cab and boarding position of crane

The utility model discloses an automatic detection device for the distance between a cab and a boarding position of a crane, and belongs to the field of crane equipment, the automatic detection device comprises the cab, a trolley, main beams and the boarding position, the cab is fixed on the trolley, the trolley runs on a track between the main beams, and distance measurement forging iron is fixed on the main beams; the upper surface of the distance measuring iron is an inclined surface, and the head end and the tail end of the distance measuring iron are different in height; the trolley is provided with a laser distance measuring sensor matched with the distance measuring casting iron, and a probe of the laser distance measuring sensor faces the distance measuring casting iron; the laser distance measuring sensor is electrically connected with the PLC, and the PLC is electrically connected with a driving system of the trolley. The projection length of the upper surface of the distance measuring forging iron