Safety detection device for elevator speed governor

The safety detection device comprises a box body, an electric switch, a rope wheel and a gravity hammer, one side of the box body is provided with a through hole, the outer side of the box body is fixedly connected with the electric switch, the outer side of a fixed shaft is rotatably connected with the gravity hammer, the bottom end of the gravity hammer is rotatably connected with a connecting rod, and the connecting rod is fixedly connected with the rope wheel. The tachometer comprises a tachometer wheel, a fixing plate, a controller and a controller, the tachometer wheel is fixedly connected with the tachometer wheel, the bottom end of the fixing plate is fixedly connected with a weighting block, the bottom end of the outer side of the weighting block is fixedly connected with contactors, every two contactors form a group, the outer side of an electric appliance switch is fixedly connected with an expansion piece, and one end of the expansion piece is fixedly connected with a pull rod. An engineer can rec