Displacement testing device for liquid expansion type diaphragm capsule

The utility model discloses a displacement testing device for a liquid expansion type diaphragm capsule, which relates to the technical field of diaphragm capsule detection and comprises a mounting seat, two clamping blocks are horizontally and slidably connected to the inner side of the mounting seat, abutting blocks are arranged on the adjacent sides of the two clamping blocks, two air cylinders are symmetrically and fixedly connected to the two sides of the mounting seat, and the two air cylinders are symmetrically and fixedly connected to the inner side of the mounting seat. A piston rod of the air cylinder penetrates through the clamping block and is fixedly connected with the abutting block. The outer side of the piston rod of the air cylinder is sleeved with a buffer spring. A movable block is arranged between the two clamping blocks, second inclined planes are arranged on the two sides of the movable block, first inclined planes parallel to the second inclined planes are arranged on the inner side of