Longitudinal plugging device of cylinder leakage testing machine

A longitudinal plugging device of a cylinder leakage testing machine comprises a lifting plugging mechanism and a top plugging mechanism, the top plugging mechanism is arranged above the lifting plugging mechanism, and a plugging area is arranged between the lifting plugging mechanism and the top plugging mechanism; the lifting plugging mechanism comprises a lifting cylinder, the lower plugging plate arranged at the end part of an output shaft of the lifting cylinder and a plurality of guide rods connected with the lower plugging plate, the lifting cylinder is fixedly arranged on a base of the cylinder body leakage testing machine, the output shaft of the lifting cylinder extends upwards, a guide sleeve is fixedly arranged on the base, and the guide rod is connected with the guide sleeve. The top of the guide rod is fixedly connected with the lower plugging plate, the bottom end of the guide rod penetrates through the guide sleeve, and a first limiting mechanism for limiting the lifting air cylinder is arrang