Pneumatic clamping device

The utility model relates to a machine tooling field, concretely relates to pneumatic clamping device, a pneumatic clamping device, including plummer, cylinder, slurcam, support, link joint, clamp plate, plummer upper portion is fixed with the support, and the lower part is fixed with the cylinder, the slurcam lower extreme with piston rod in the cylinder links firmly, slurcam upper end with the one end of clamp plate is connected, the clamp plate with be connected with between the support the link joint, the link joint have two, connect respectively in narrow portion and clamp plate both sides, all through a round pin axle rotation connection between slurcam and the clamp plate, between clamp plate and the link joint, between link joint and the support, the clamp plate front end is provided with the sheet rubber with work piece contact department, the utility model discloses the packing force that well simple structure, cylinder provided is accurate, firm, can not become flexible during the processing work p