Anti-retreating locking structure for centrifugal pump shaft

The anti-back locking structure comprises a main shaft and a balance shaft sleeve arranged on the main shaft in a sleeved mode, a first ring groove, a second ring groove and a third ring groove are formed in the main shaft at intervals, a clamping ring sleeve is arranged at the position, located at the third ring groove, of the main shaft in a sleeved mode, and a step hole is formed in the end, facing a second split clamping ring, of the clamping ring sleeve. The clamping ring sleeve is further provided with a T-shaped groove and a threaded hole, a longitudinal groove of the T-shaped groove is parallel to the axis of the main shaft and provided with an opening facing the second split clamping ring, a transverse groove of the T-shaped groove is located in the middle of the clamping ring sleeve, the main shaft is provided with a cylindrical pin in the radial direction, and the cylindrical pin is matched with the transverse groove of the T-shaped groove. A locking bolt is arranged in the threaded hole in a screw