Rolling loosening device and method for spherical hinge structure on plunger pump

The invention provides a rolling loosening device for a spherical hinge structure on a plunger pump. The spherical hinge structure comprises a spherical seat and a spherical rod hinged in the spherical seat; the rolling loosening device comprises a wheel handle and a rotating piece; the rotating piece is driven by the spherical seat to rotate after making contact with the spherical seat and drivesthe spherical rod to rotate in the spherical seat; and the rotating piece is rotationally connected onto the wheel handle. The rotating piece is driven by the rotating force of the spherical seat torotate, the gap is produced between the spherical seat and the spherical rod through contact and rolling loosening of the rotating piece and the spherical seat, the gap in the connection position of the spherical seat and the spherical rod is changed, flexible rotation of the spherical hinge structure is guaranteed, thus the use performance of a plunger component is improved, the flexible degree of spherical hinge connecti