Crankshaft pin anti-droping device of beam-pumping unit

The utility model relates to an anti-dropping device for crank pins of oil pumping devices, which is composed of a connecting rod, a clamping hoop, a supporting tube, a guard tube, a positioning body, a regulating tube, a back cap, and a positioning screw nail. After installed on an oil pumping machine, the utility model make the lower end of the connecting rod can not move outwards along the radial direction to ensure that a crank pin connected with the lower part of the connecting rod can be prevent from disengagement, so that various losses caused by that the oil pumping machine overturns because of the disengagement of the crank pin can be avoided. When the problem that the crank pin can not be folded out occurs, the regulating tube can be regulated to make the lower end of the connecting rod generate outward force to push the crank pin out, so that the purposes of replacing the crank pin and regulating the stroke of the oil pumping machine can be achieved.