| 摘要 |
In a pneumatic-hydraulic system for driving a hydraulic actuator, a single pneumatic-hydraulic converter includes a cylinder casing with inlet and outlet ports and a plunger reciprocably disposed within the casing to form a hydraulic chamber in open communication with the inlet and outlet ports and a pneumatic chamber for connection to a pneumatic pressure source, the hydraulic chamber having a displacement capacity filled with a predetermined amount of hydraulic fluid necessary for producing at least one reciprocating motion of the actuator. The system also includes supply and return passages respectively connected with the outlet and inlet ports, a change-over valve for switching over hydraulic connection of the passages to the actuator, a hydraulic fluid reservoir within the return passage to store the hydraulic fluid discharged from the actuator, the capacity of the reservoir being larger than that of the hydraulic chamber, and a check valve between the inlet port and the reservoir for permitting the flow of fluid from the reservoir into the hydraulic chamber.
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