Pneumatic dual-effect three-jaw linkage device

The invention relates to a pneumatic dual-effect three-jaw linkage device which comprises an installation bottom plate, air cylinders, linear guide rails, sliding base cushion blocks, a rotating discand clamping jaws. The two sides of the installation bottom plate are each provided with one air cylinder, the multiple linear guide rails are arranged on the installation bottom plate, and one ends of the multiple linear guide rails are converged to a clamping center point; each linear guide rail is provided with one sliding base cushion block, and the sliding base cushion blocks are in sliding connection with the linear guide rails; each sliding base cushion block is provided with one clamping jaw, and the multiple sliding base cushion blocks are connected with the rotating disc through connection rods; and the two air cylinders are jointly connected with one sliding base cushion block and apply acting force in the same direction to the corresponding sliding base cushion block. Clampingforce of the clamping jaws