pneumatiskhydraulisk

Pneumatiskhydraulisk, or pneumatic-hydraulic systems, refers to engineering arrangements that combine pneumatic and hydraulic power to perform actuation tasks. In these systems, compressed air provides fast, simple motion or control, while hydraulic fluid delivers high force, precise positioning, and smooth motion. The goal is to exploit the strengths of both technologies: the speed and ease of pneumatics with the load capacity and controllability of hydraulics.

Common configurations include hybrid actuators where a pneumatic cylinder advances a position quickly and then a hydraulic circuit engages to provide high clamping force or fine control at the end of stroke. Another pattern is an air-driven hydraulic pump, or an air-over-oil arrangement, where compressed air drives a hydraulic pump that pressurizes oil in a circuit. These setups enable rapid actuation at light loads and strong, controlled motion for heavy loads, without relying on a single technology for all requirements.

Typical components cover both domains: air compressors, air preparation units and valves, pneumatic cylinders, hydraulic pumps, accumulators, reservoirs, hydraulic cylinders, seals, hoses, and control electronics.

Advantages of pneumatic-hydraulic systems include the ability to deliver high force with compact hardware, rapid initial movement, and versatile control over speed and position. They also offer redundancy of functions and can be tailored to meet specific cycle requirements. Limitations include increased system complexity, potential energy losses during power conversion, oil leaks, maintenance needs, and the requirement for careful integration of two fluid-power subsystems.

Applications are found in machine tools, presses, clamping operations, robotics, and other industrial areas where a combination of speed and high force is beneficial.