Actuator control circuit
AssigneeSMC Corporation
InventorsQinghai Yang, Masayuki Hosono
Life of this patent
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Abstract
Disclosed is an actuator control circuit which adopts a meter-in control system to control the displacement speed of a piston of a pneumatic cylinder and which is provided with a first pressure control valve to be in a free flow state when compressed air is supplied to the pneumatic cylinder and a second pressure control valve for retaining discharge pressure of compressed air discharged from the pneumatic cylinder to be a previously set predetermined pressure.
Claims14
An actuator control circuit based on the use of a meter-in circuit for controlling displacement speed of an actuator, said control circuit comprising:
- a minimum pressure-retaining mechanism for making control such that a free flow state is given when a pressure fluid is supplied to said actuator, while pressure of said pressure fluid discharged from said actuator is retained to be a preset predetermined pressure, said minimum pressure-retaining mechanism including a first pressure control valve provided on a side of a first passage for said actuator and a second pressure control valve having identical constitutive components as said first pressure control valve and provided on a side of a second passage for said actuator, said first and second pressure control valve each including a valve body provided with a first port and a second port, a check valve for discharging said pressure fluid supplied from said first port from said second port in said free flow state and prohibiting flow of said pressure fluid from said second port to said first port, and a relief valve having a minimum pressure-retaining function for retaining said pressure of said pressure fluid discharged from said actuator to be at said preset predetermined pressure.
An actuator control circuit based on the use of a meter-in circuit for controlling displacement speed of an actuator, said control circuit comprising:
- a pneumatic cylinder provided with a pair of ports for introducing and discharging compressed air and a piston for making displacement along cylinder chambers in accordance with an action of said compressed air supplied from said respective ports;
- a switching mechanism for supplying said compressed air discharged from a compressed air supply source while making changeover between said first and second port of said pneumatic cylinder;
- a first speed control valve and a second speed control valve provided between said pneumatic cylinder and said switching mechanism, for controlling flow rate of said compressed air to be supplied to said cylinder chamber;
- and
- a first pressure control valve and a second pressure control valve provided between said switching mechanism and said first speed control valve and said second speed control valve, for making control such that a free flow state is given when said compressed air is supplied to said pneumatic cylinder, while discharge pressure of said compressed air discharged from said cylinder chamber is retained to be a previously set predetermined pressure.
An actuator control circuit based on the use of a meter-in circuit for controlling displacement speed of an actuator, said control circuit comprising:
- a pneumatic cylinder provided with a pair of ports for introducing and discharging compressed air and a piston for making displacement along cylinder chambers in accordance with an action of said compressed air supplied from said respective ports;
- a switching mechanism for supplying said compressed air discharged from a compressed air supply source while making changeover between said first and second ports of said pneumatic cylinder;
- and
- a relief mechanism-equipped pressure control valve provided between said compressed air supply source and said switching mechanism, for retaining discharge pressure of said compressed air discharged from said cylinder chamber to be a previously set predetermined pressure.
Dependencies are inferred from the claim text.