| 摘要 |
A hydropneumatic actuator applicable to linear actuations, comprising arrangements the purpose of which is to create internally and regeneratively a hydraulic pressure from the movement of the movable parts. These arrangements make it possible to slow the movement by finely adjusting its speed when this is required for the usage. The actuator comprises an annular pneumatic piston (Pp) provided with a movable tube (21) crimped in the internal bore of the piston, the pneumatic piston (Pp) being able to be moved in an external cylinder (Cy) under the effect of a pressure differential applied to the exterior by pneumatic connections (X1, X2). The actuator is further provided with a coaxial hydraulic piston (Ph) provided with a rod (10) sliding in a fixed coaxial lining (19, 20) separating the two pistons which remain attached to each other by a mechanical connection (1 1) between the end of the rod (10) of the hydraulic piston and the end of the movable tube (21). The actuator further includes electrical or pneumatic control valves, adjustable chokes, non-return valves, and an oil reservoir (15) kept under pressure by a spring (16) adjustable by a screw (1). The reservoir can be connected through valves, adjustable chokes and non-return valves to both sides of the hydraulic piston (Ph). |
