Crane with overhead pulley

The invention discloses a crane with an overhead pulley. The crane comprises a support, a crane body is arranged on the top of the support, the crane body comprises a pulley box, a fixed pulley, a pressing device and a lubricating device are arranged in the pulley box, the pressing device comprises a pressing wheel, a rotating frame and a rotating shaft, the rotating shaft is arranged on the upper portion of the middle of the fixed pulley, a torsional spring is connected with one end of the rotating frame, the other end of the rotating frame is connected with the pressing wheel, the edges of the two sides of the pressing wheel are connected with the edges of the two sides of the fixed pulley in a rolling mode, and the middle of the pressing wheel is arranged in a pulley groove of the fixed pulley; and the lubricating device comprises an oil tank and oil cylinders, a plurality of ball holes are formed in the inner ring wall of the oil tank in a penetrating mode, a plurality of sets of oil cylinders are arrange