The application belongs to the technical field of
plunger pumps, and particularly discloses a
plunger pump with automatic rotation and centering of
plunger, which comprises a liquid end and a power end, the power end comprises an intermediate rod and a transmission
assembly for driving the intermediate rod to move, the liquid end is connected with a plunger piece, the intermediate rod is fixed with a connecting frame, a
universal structure is arranged at the fixed end of the intermediate rod and the connecting frame, the part of the
universal structure away from the intermediate rod is connected with the plunger piece, and the
universal structure comprises a thrust aligning bearing outer ring fixed on the intermediate rod. The plunger piece and the intermediate rod in the
plunger pump are connected through the universal structure, so that not only the huge thrust required for pressurization can be transmitted, but also the plunger piece cannot be stuck in the liquid end, the plunger piece can rotate easily during use, the same part of the plunger piece can be avoided from being repeatedly scraped by hard particles, the plunger piece can be deflected through the magnetic force adjusting
assembly, and the plunger piece and the connecting structure can be automatically centered and adjusted.