QWZ5-800/100 Series Pneumatic Drum Brake

QWZ5-800/100 series are normally‑closed, pneumatically released pneumatic drum brakes, mainly used for braking, stopping and safety holding in cranes, hoists, metallurgical machinery, mining equipment and other industrial transmission systems using air pressure control.

Basic Identification

Model: QWZ5-800/100 series

Type: Pneumatic drum brake

Brake drum diameter: 800 mm

Actuation mode: Pneumatic cylinder, spring applied, pneumatically released

Structure: Normally closed, fail‑safe

Working Principle

Brake state (no air pressure):Built-in heavy-duty springs press the brake shoes against the drum to provide braking torque.

Release state (air pressure on):Pneumatic cylinder pushes the brake arm to overcome spring force and release the brake.

Automatic safety braking when air pressure is lost.

Key Features

Pneumatic control, safe and reliable

Normally closed fail‑safe design

Stable braking torque, strong holding force

Asbestos‑free friction linings, long service life

Adjustable brake shoe clearance

Simple structure, easy installation and maintenance

Suitable for industrial sites with compressed air supply

Typical Applications

Bridge cranes, gantry cranes, hoists and winches

Metallurgical, mining and conveying machinery

Systems using pneumatic control and braking

Outdoor and heavy‑duty industrial equipment

Short version 

QWZ5-800/100 series pneumatic drum brakes are normally‑closed, spring‑applied, pneumatically released brakes with 800 mm drum diameter, used for braking and safety holding in pneumatic control industrial machinery.

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