Device for measuring internal diameter deformation in pipe ring stiffness detection

The utility model discloses a device for measuring internal diameter deformation in pipe ring stiffness detection. The device comprises a main slide way, a heavy hammer, an upper deformation conducting rod, an upper deformation measuring head, an upper slide block, a lower deformation conducting rod, a lower deformation measuring head and a lower slide block, wherein the upper slide block and the lower slide block are both arranged on the main slide way; the upper deformation conducting rod is fixed on the upper slide block; the lower deformation conducting rod is fixed on the lower slide block; the same sides of the upper deformation conducting rod and the lower deformation conducting rod are respectively connected with an upper test rod and a lower test rod of a large deformation device of an external electronic universal material testing machine, and the other sides of the upper deformation conducting rod and the lower deformation conducting rod are respectively provided with the upper deformation measurin