Double-piston pneumatic actuator

The double-piston pneumatic actuator comprises an air cylinder, a push rod, a feedback rod and a two-position five-way electromagnetic valve, a partition plate is arranged in the air cylinder, a first piston is arranged at the position, located at the front end of the partition plate, in the air cylinder, and a second piston is arranged at the position, located at the rear end of the partition plate, in the air cylinder. The first piston, the partition plate and the second piston sequentially divide the interior of the air cylinder into a first cavity, a second cavity, a third cavity and a fourth cavity from top to bottom. The push rod penetrates through the first piston and the second piston, the first piston is fixedly connected with the push rod, and a push plate is arranged on the second piston and extends into the second cavity to be in contact with the first piston; feedback rods are arranged at the front ends of the push rods. According to the double-piston pneumatic actuator, the problem that the outp