Socket wrench special for split type crank pins

The utility model relates to a stroke adjustment device for oil pumping units in oil fields, in particular to a special sleeve spanner for detachable hooked bar pins, which has the technical proposal that the stroke adjustment device is composed of a stress application bar, a guiding head and a sleeve, wherein, the stress application bar is connected with the sleeve via the guiding head, the outer end of the sleeve is a hexagonal concave hole, the inner end is a quadrangular through hole, and the sleeve is connected with the guiding head via the quadrangular through hole. The stroke adjustment device has the beneficial effects of conversion without disassembly, convenient operation, time conservation and labor conservation of stroke adjustment; the well stopping time is reduced, the loss of base oil is decreased and the economic efficiency is improved.