Pneumatic hoist is a lifting equipment that uses compressed air as a power source, and its working principle combines pneumatic technology with mechanical transmission mechanism. The following is a detailed analysis of its core operating principle:

1、 Power source and core structure

Compressed air drive

Pneumatic hoists use compressed air provided by an air compressor as a power source, and the compressed air pressure is usually between 0.4-0.7 MPa. Compared to electric or hydraulic equipment, compressed air has the advantages of explosion prevention, cleanliness, and low cost, especially suitable for flammable and explosive environments such as petroleum and chemical industries.

Key components

Pneumatic motor: the core component that converts the pressure energy of compressed air into mechanical energy. Common structures include blade or piston structures, where compressed air drives the blades or pistons to rotate and drives chains or cables to lift and lower.

Control valve: By adjusting the airflow path to control the forward and reverse rotation of the motor, the load can be raised, lowered, or suspended.

Braking device: Air brakes are usually used, which automatically hold the brakes when the air supply is stopped to prevent the load from accidentally falling.

2、 Working principle and process

Enhancement process

Airflow path: Compressed air enters the upper chamber of the pneumatic motor through a control valve, pushing the blades or pistons to rotate.

Mechanical transmission: The motor output shaft drives the chain or cable to wrap and lift the load.

Speed control: achieve continuously variable transmission by adjusting the intake volume or air pressure.

The descent process

Reverse airflow: The control valve switches the airflow direction, compressed air enters the lower chamber of the motor, and the upper chamber exhausts.

Load self weight assistance: The load gravity accelerates the descent, and the motor controls the descent speed through exhaust throttling.

Hovering and Braking

Balance state: The control valve closes the intake passage, the pressure inside and outside the motor is balanced, and the load is stationary.

Emergency braking: The air brake should be immediately applied in case of power failure or malfunction to ensure safety.

3、 Technical advantages

Explosion proof safety

No sparks, no high temperatures, compliant with ATEX and other explosion-proof standards, suitable for hazardous environments such as oil drilling platforms and coal mines.

Flexible speed regulation

Accurate control of light load speed (such as 33 m/min) and heavy load slow speed can be achieved through air pressure regulation.

compact

Lightweight design for easy installation, some models can be operated handheld, suitable for small spaces.

Low maintenance cost

No complex oil or electrical circuits, low failure rate, and a lifespan of several decades.

4、 Application scenarios

Petroleum/Chemical: Drilling platform column lifting and equipment maintenance.

Manufacturing industry: mold lifting, production line material handling.

Ship/Building: Offshore operations, steel structure installation.

Special environment: Replace electric hoists in humid, high-temperature, or explosion-proof areas.

5、 Operational safety regulations

Load limit: Overloading is strictly prohibited, and the rated load (such as 0.5-50 tons) needs to be regularly verified.

Environmental adaptation: Avoid using on strong winds or unstable surfaces.

Maintenance inspection: Daily check for air pressure, chain wear, and brake flexibility.

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