the device comprises six gasket, which are respectively a first gasket, a second gasket, a third gasket, a fourth gasket, a fifth gasket and a sixth gasket; and further comprises a guide rail sealing cover, wherein a spring is arranged in the guide rail sealing cover;

a right side of the first gasket at a bottom portion is provided with a projection structure, a bottom side of the second gasket on a right side is provided with a groove, the projection structure on the right side of the first gasket at the bottom portion is matched with the groove on the bottom side of the second gasket on the right side, and the first gasket is tightly embedded with the second gasket;

the third gasket on a rear side is provided with a projection structure, a rear side of the first gasket at the bottom portion is provided with an antifriction guide rail, and the projection structure slides in the antifriction guide rail;

a bottom side of the fourth gasket on a front side is provided with a projection structure, a front side of the first gasket at the bottom portion is provided with an antifriction guide rail, and the projection structure on the bottom side of the fourth gasket on the front side is embedded in the antifriction guide rail on the front side of the first gasket at the bottom portion; and the guide rail sealing cover matched with the antifriction guide rail on the front side of the first gasket is further comprised, wherein a central axis of the spring of the guide rail sealing cover is arranged along a Y direction;

the fifth gasket at a top portion is provided with a front-side projection structure and a right side projection structure, the fourth gasket on the front side is provided with a top-side antifriction guide rail, and the second gasket on the right side is provided with a top-side antifriction guide rail; and the fourth gasket on the front side is further provided with a guide rail sealing cover matched with the top-side antifriction guide rail of the fourth gasket, and the second gasket on the right side is further provided with a guide rail sealing cover matched with the top-side antifriction guide rail of the second gasket;

a length of the first gasket and a length of the third gasket in an X direction are both smaller than a length of a test sample in the X direction; and

left and right sides of the sixth gasket are respectively provided with a thin filling block and a long filling block which are capable of being compressed and deformed; a size difference between the guide rail sealing cover and the antifriction guide rail is 0.05 mm; and a size of the test sample is L mm+1 mm, the length of the first gasket and the length of the third gasket in the X direction are both L mm, and L is a value set according to test needs.