Special crane for laying flue plate in tunnel

A special crane for laying flue plates in a tunnel comprises a crane supporting frame, a cart traveling mechanism is arranged at the bottom end of the crane supporting frame, a supporting arm is arranged above the crane supporting frame, the left end of the supporting arm is rotatably hinged to the left side of the top end of the crane supporting frame, and an obliquely-arranged oil cylinder is arranged between the crane supporting frame and the supporting arm. The bottom end of the oil cylinder is hinged to the crane supporting frame, and the top end of the oil cylinder is hinged to the bottom end of the middle of the supporting arm. A lifting mechanism is arranged at the left end of the supporting arm, a horizontally-arranged telescopic supporting beam is fixed to the right end of the supporting arm, the telescopic supporting beam is perpendicular to the supporting arm, fixed pulley blocks are assembled at the two ends of the telescopic supporting beam, and a rotary lifting tool used for lifting a flue plat