Double-limiting structure of valve positioner switch

The valve positioner switch double-limiting structure comprises an outer frame and a limiting rod, an air pump is installed at one end of the surface of the top of the outer frame, an air bag is installed on the surface of a vertical plate, the output end of a motor is connected with a rotating disc in a key joint mode, and the other end of a sliding rod is connected with an inclined supporting rod. One end of the inclined supporting rod is connected with a sliding block, clamping pads adhere to one side face of the clamping plate, and a valve positioner is arranged between the clamping pads. According to the valve positioner switch double-limiting structure, a sliding structure composed of the sliding block and the transverse rod is arranged, so that the clamping rods on the upper surface of the sliding block can clamp and limit the two sides of a valve positioner under the transmission action of the motor, and the valve positioner is prevented from moving left and right; meanwhile, a limiting rod on the upp