Step-by-Step Working Process

(1) Air Supply and Compression

Compressed Air Source:

A compressor supplies compressed air (typically 0.5–0.7 MPa) through a hose to the winch.

Air Filtering:

The air passes through a filter to remove moisture, oil, and debris, ensuring clean operation.

(2) Pneumatic Motor Activation

Airflow Control:

The operator adjusts the control valve to direct compressed air into the pneumatic motor.

Motor Rotation:

The air drives pistons or a vane mechanism inside the motor, converting air pressure into rotational motion.

Torque Generation:

The motor’s crankshaft or rotor rotates, generating torque to drive the gearbox.

(3) Speed Reduction and Torque Amplification (Gearbox)

Gear Ratio Adjustment:

The gearbox reduces the high-speed rotation of the motor to a slower, more powerful output suitable for lifting.

Torque Transfer:

The amplified torque is transmitted to the winch drum via a shaft or chain.

(4) Winch Drum Operation

Cable Winding/Unwinding:

The rotating drum winds or unwinds the cable/rope, lifting or lowering the load.

Direction Control:

The operator reverses the airflow direction via the control valve to change the winch’s movement (up or down).

(5) Braking and Safety

Brake Engagement:

When the control valve returns to the neutral position, the brake system engages automatically, locking the drum and preventing uncontrolled descent.

Emergency Stop:

The emergency stop button cuts off the air supply instantly, halting the winch.

(6) Overload Protection

Load Monitoring:

If the load exceeds the winch’s rated capacity, the overload protection device triggers, stopping the winch to prevent damage or accidents.

Key Mechanisms Explained

(1) Pneumatic Motor Mechanism

Vane Motor Example:

Compressed air pushes vanes outward against the motor housing, causing rotation.

Piston Motor Example:

Air drives pistons back and forth, converting reciprocating motion into rotational motion via a crankshaft.

(2) Brake System Mechanism

Spring-Applied Brake:

When air pressure is released, a spring forces brake pads against the drum, stopping rotation.

Air-Released Brake:

Compressed air holds the brake open; loss of pressure engages the brake.

(3) Control Valve Mechanism

Directional Control:

A spool valve or poppet valve redirects airflow to control the motor’s rotation direction.

Speed Regulation:

Adjusting the valve opening size varies airflow, controlling the winch’s speed.

Advantages of the Pneumatic Winch Design

Explosion-Proof:

No electric sparks, making it safe for hazardous environments.

High Load Capacity:

Can handle heavy loads (2–10 tons) with continuous operation.

Compact and Lightweight:

Simpler structure than hydraulic or electric winches, ideal for tight spaces.

Low Maintenance:

Fewer moving parts reduce wear and maintenance needs.

Summary of Working Principle

Compressed air powers the pneumatic motor.

The motor’s rotation is transferred to the gearbox for torque amplification.

The gearbox drives the winch drum to lift or lower the load.

The brake system ensures safety by locking the drum when needed.

The control valve regulates speed and direction, while overload protection prevents damage.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment