The utility model provides a lightweight crane hoisting mechanism, which relates to the technical field of crane hoisting, and comprises a mounting plate, a fixing plate, a winding drum, a
brake, a circular ring support shell, a driving roller, a driving
assembly, an
electromagnetic clutch, a detection
assembly and a controller, after the steel
wire rope is jammed, the device can quickly detect that the rotating speed of the winding drum is reduced through the detection
assembly, and if the rotating speed of the winding drum cannot be recovered within a specified
time range, the controller controls the
electromagnetic clutch to be powered off, so that the driving roller and the winding drum are instantaneously disconnected; meanwhile, the
brake immediately brakes to prevent the heavy object from falling, and the maintenance and replacement process of the steel
wire rope and the winding drum can be carried out after the heavy object is transferred away through standby hoisting equipment, so that the service life of the driving assembly is prolonged, and the potential safety
hazard of breakage of the steel
wire rope is reduced to the minimum; according to the design, the hoisting mechanism of the crane can be automatically protected, so that the operation process of the hoisting mechanism of the crane is better.