Cement flow bearing device

A cement bearing device belongs to the field of oil and gas well cementing equipment and structurally comprises an upper connector, an outer cylinder, a lower connector and a barrel rod, the outer cylinder is fixedly and hermetically connected between the upper connector and the lower connector, a cementing channel is arranged on the side wall of the outer cylinder, a piston is arranged on the inner side of the outer cylinder, and two ends of the piston can be hermetically matched with the upper connector and the lower connector respectively. The lower portion of the piston is connected with a connecting pipe, a long hole penetrating through the side wall of the connecting pipe is formed in the middle of the connecting pipe in the circumferential direction, the length direction of the long hole is consistent with the axial direction of the connecting pipe, a protrusion A is arranged on the outer wall of the connecting pipe in the middle of the long hole section, a groove for containing the protrusion A is for