Heavy-type cover plate lifting device

The invention provides a cover plate lifting device which is strong in safety, high in efficiency and easy and convenient to operate. The cover plate lifting device comprises a door-shaped frame. The door-shaped frame comprises a beam at the top and two vertical rods. A base plate is arranged at the bottoms of the vertical rods. Universal pulleys are arranged at the two ends of the base plate. Reinforcing rods are arranged between the two ends of the base plate and the vertical rods. The beam is an H-shaped steel rail. A monorail trolley is arranged on the beam. A lever block is connected to the lower portion of the monorail trolley. A cover plate lifting mechanism is hooked below a lifting hook of the lever block. According to the cover plate lifting device, the mechanical lifting device is adopted to replace a traditional manually-operated operating mode, workloads are reduced, and meanwhile safety is improved. The lifting device is of a door-shaped framework, the monorail trolley is utilized for being conn