Differential expansion device for electric hoist

The utility model discloses a differentiable expansion device for electric hoist, including shell, wire rope, threaded rod and connecting block, the middle of shell upper end face is fixed with the connecting shell, the both ends of shell interior are fixed with the baffle, and the rolling shaft is rotatingly installed between the two baffle, the number of the threaded rod is two, and the connecting block is fixed with the connecting shell. The two threaded rods are rotationally installed on the two sides of the winding shaft correspondingly, the winding shaft is sleeved with a positioning sleeve, an operation opening is formed in the middle of the lower end face of the shell, the connecting block is located on the lower side of the operation opening, sleeve shells are fixed to the two ends of the connecting block correspondingly, and hooks are fixed to the lower end face of the connecting block. One end of the steel cable is fixed to one side of the operation opening, the end, away from the operation opening