Air Drive Hydraulic Power Unit
A air drive hydraulic power unit is a device that uses compressed air to generate high-pressure hydraulic oil. By driving a hydraulic piston with a pneumatic cylinder, it converts low-pressure air energy into high-pressure hydraulic energy. Through the principle of hydraulic intensification (pressure ratio), it can generate hydraulic pressure many times higher than the input air pressure, without the need for a large hydraulic pump. Typical input air pressure: 5–8 bar; output hydraulic pressure: 50 bar to 350 bar or even higher.

Main Components
1. Pneumatic Drive Module – driven by compressed air.
2. Hydraulic Intensifier Cylinder – converts pneumatic force into hydraulic pressure.
3. Oil Reservoir – stores hydraulic oil.
4. Control Valve Set – includes directional control valve, check valve, and relief valve.
5. Pressure Switch / Sensor (optional) – monitors output hydraulic pressure.

Features
• High Pressure Output: Small pneumatic input produces high hydraulic output.
• Compact and Simple Structure: Eliminates the need for a traditional hydraulic pump and motor.
• Safe Operation: Operates only with compressed air, reducing electrical hazards.
• Easy Maintenance: Modular design of pneumatic and hydraulic components.
• High Energy Efficiency: Consumes air only during operation.

Applications
1. Clamping Fixtures / Jigs: Used with hydraulic cylinders in CNC machining or automated fixtures. Example: workpiece positioning → high-pressure hydraulic clamping.
2. Press-Fitting / Assembly Processes: Provides high pressure for press-fitting, riveting, and assembly operations.
3. Mold Operation: In plastic, die-casting, or stamping molds, drives small hydraulic cylinders for ejection, release, or locking.
4. Testing Equipment: Supplies high-pressure oil for pressure resistance and leakage testing.
5. Handling / Gripper Mechanisms: Provides stable thrust through hydraulic cylinders for automated handling.

Typical Example
In an automated fixture system: The compressed air system provides 6 bar air pressure → supplied to the pneumatic-hydraulic power unit. The unit converts this into 150 bar hydraulic pressure → delivered to the hydraulic cylinder. The hydraulic cylinder then performs clamping, pressing, or ejecting operations.

Advantages Compared
Compared with pure pneumatic systems: Can deliver higher thrust and more stable operation.
Compared with pure hydraulic systems: No motor or large oil tank required → simpler system and lower cost.