Switch pendulum impact testing machine

The utility model discloses a switch pendulum bob impact testing machine, which comprises a base, a mounting block arranged at the center of the upper end of the base, a rack arranged at the upper end of the mounting block, a connecting rod arranged at the right side of the upper part of the rack, a pendulum rod rotatably arranged at one end of the connecting rod far away from the rack, and a pendulum bob arranged at the bottom of the pendulum rod. An up-down moving block is arranged on the rack in a sliding manner; a nut is arranged at the left end of the up-down moving block, and a supporting plate is arranged at the right end; a screw rod is in threaded connection in the nut, and the bottom end of the screw rod is arranged on the base and located on the left side of the mounting block; the upper end of the screw rod is connected with a reduction gearbox which is connected with a positive and negative rotation motor; a left-right moving block is arranged on the supporting plate in a sliding manner; the bott