Large-flow pneumatic piezoelectric valve based on bridge type amplifying mechanism

The high-flow pneumatic piezoelectric valve based on the bridge type amplifying mechanism comprises a piezoelectric valve structure and a piezoelectric actuator, and the piezoelectric valve structure comprises a main valve body, a conical valve element, a fixing support, an expansion sleeve, an optical shaft and an elastic return plate; the elastic return plate and the fixing support are fixedly installed on the end faces of the two sides of the main valve body respectively, the optical shaft is fixedly arranged in the fixing support, and the outer side of the optical shaft is sleeved with an expansion sleeve; one end of the conical valve core is connected with the piezoelectric actuator, and the other end is fixedly connected to the center of the elastic recovery plate; the piezoelectric actuator comprises a bridge type displacement amplifying mechanism and a piezoelectric stack, one end of the displacement amplifying mechanism is fixedly connected with the conical valve element, and the other end of the dis