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
