Quick clamp for tensile test of PET (polyethylene glycol terephthalate) cotton packing belt

The invention discloses a quick clamp for a tensile test of a PET (polyethylene glycol terephthalate) cotton packing belt. A right-lower roller wheel of a roller wheel mechanism is a fixed roller wheel; a left-lower roller wheel and an upper roller wheel are rotating roller wheels; a hold-down mechanism is a symmetrical mechanism consisting of crank sliding block mechanisms which respectively belong to the left side surface and the right side wall of a shell, and a handle for connecting the crank sliding block mechanisms; middle sections on the left side surface and the right side surface of the shell are respectively provided with a long sliding chute; an upper roller wheel shaft penetrates through the upper roller wheel and the sliding chutes, further, two ends of the upper roller wheelshaft are symmetrically connected with the lower ends of connecting rods positioned at the outer sides of the left side surface and the right side surfaces of the shell; the upper ends of the connecting rods are movably conne