Plate spring strain limiting load amplification overload protector of single-machine multi-well pumping unit

The plate spring strain limiting load amplification overload protector comprises a rotating shaft, a rotating hook, a shell, a plate spring set, a pre-tightening screw and a pressing screw, the rotating hook is fixed to the shell through the rotating shaft, a rope groove in the rotating hook is connected with an oil well end flexible rope, a rope hole is formed in the shell, and the rope hole is connected with a main machine end flexible rope; the swivel hook is rotationally connected with the shell with the rotating shaft as the axis, a swivel hook head rope groove is connected with an oil well end flexible rope, and the tail of the swivel hook is pressed on a plate spring set in the shell. The pre-tightening screw is arranged on the upper side of the middle of the shell, and the pressing screw is arranged on the upper side of the right of the shell. The plate spring strain limiting load amplification overload protector solves the problem that normal work of a single-machine multi-well oil pumping unit syste