Working principle of piezoelectric driven striker injection valve:
At the initial moment, the colloid fills the valve body channel, the upper part of the striker is pressed against the bottom of the nozzle and seals the nozzle outlet, the piezoelectric actuator is applied with high frequency, the piezoelectric actuator is extended laterally, and the striker is lifted up. When the nozzle is opened, the external air pressure drives the glue to fill the gap of the valve body formed by the upward movement of the striker, and a certain amount of glue flows out of the nozzle. The piezoelectric brake is applied with low electric frequency. Under the action of the spring restoring force, the firing pin hits the nozzle cavity at high speed downwards and seals the nozzle. The cavity squeezed in the nozzle is ejected under the action of inertial force to form glue droplets, which are driven by alternating high and low electrical frequencies. , The firing pin vibrates up and down continuously to achieve high-speed spray dispensing. The amplitude and frequency of the firing pin can be adjusted by changing the driving voltage amplitude, frequency, duty cycle, etc., so as to realize the control of the droplet ejection performance.
At the initial moment, the colloid fills the valve body channel, the upper part of the striker is pressed against the bottom of the nozzle and seals the nozzle outlet, the piezoelectric actuator is applied with high frequency, the piezoelectric actuator is extended laterally, and the striker is lifted up. When the nozzle is opened, the external air pressure drives the glue to fill the gap of the valve body formed by the upward movement of the striker, and a certain amount of glue flows out of the nozzle. The piezoelectric brake is applied with low electric frequency. Under the action of the spring restoring force, the firing pin hits the nozzle cavity at high speed downwards and seals the nozzle. The cavity squeezed in the nozzle is ejected under the action of inertial force to form glue droplets, which are driven by alternating high and low electrical frequencies. , The firing pin vibrates up and down continuously to achieve high-speed spray dispensing. The amplitude and frequency of the firing pin can be adjusted by changing the driving voltage amplitude, frequency, duty cycle, etc., so as to realize the control of the droplet ejection performance.
