QWZ5-710/80 Series Pneumatic Drum Brake

The QWZ5-710/80 Series pneumatic drum brake is a heavy-duty, spring-applied industrial braking system that uses compressed air as the release mechanism. Here is a description of its main features and operation:

Core Operating Principle:

This brake series operates on a fail-safe, spring-applied, and pneumatically released​ principle. It is a normally-closed​ brake, where the braking force is provided by strong internal springs, and a pneumatic cylinder (actuator) is used to overcome this spring force to release the brake.

Normal State (Brake Applied):​ Without compressed air supplied, the powerful internal brake springs force the brake shoes outward against the inner surface of the brake drum, applying the full braking torque and holding the shaft stationary.

Release (Air Applied):​ When compressed air (typically at a specified pressure, e.g., 0.5-0.8 MPa) is supplied to the pneumatic cylinder, the cylinder's piston or diaphragm pushes against a lever mechanism. This action compresses the brake springs, retracting the brake shoes from the drum and releasing the brake.

Apply (Fail-Safe, Air Exhausted):​ When the air supply is cut off or lost, the pressure in the cylinder drops. The stored energy in the compressed brake springs immediately forces the cylinder piston back and re-clamps the brake shoes onto the drum, automatically and safely engaging the brake.

Key Features:

Model Designation:

QWZ5:​ Indicates the brake series and frame design.

710:​ Typically denotes the rated static braking torque (e.g., 710 Nm).

/80:​ Likely specifies the size or stroke of the integrated pneumatic cylinder (e.g., 80mm diameter).

Pneumatic Actuation:​ Air is used as the power source for release. This makes the brake compatible with standard factory air supplies, fast-acting, and suitable for explosive or hazardous environments where electric sparks are a concern. The release action is generally quick and powerful.

Spring-Applied, Fail-Safe:​ The primary safety feature. Brake engagement is automatic upon loss of air pressure, ensuring the machinery is held securely in a power-off or air-loss situation.

High Torque:​ The 710 Nm rating provides substantial braking force for stopping and holding heavy loads and high-inertia drives.

Automatic Wear Compensation:​ Usually incorporates an automatic adjustment device to maintain the correct clearance between the brake shoes and the drum as the friction linings wear, ensuring consistent brake performance.

Durable Drum Brake Construction:​ Built with robust materials for heavy-duty service, featuring cast iron shoes, levers, and a sturdy base frame suitable for industrial environments like mining, steel plants, and ports.

Optional Accessories:​ May include items like manual release levers, air pressure gauges, quick-release valves, and solenoid control valves for remote operation.

Typical Applications:

These brakes are widely used in industries with readily available compressed air, such as:

Travel and trolley drives on overhead cranes and gantry cranes.

Mining machinery, conveyor belts, and winches.

Dusty, wet, or explosive atmospheres​ where electrical components are undesirable.

Heavy material handling and processing equipment.

Summary:

The QWZ5-710/80 Series is a heavy-duty, fail-safe pneumatic drum brake. Its operation is simple and reliable: air on to release, air off to brake. It combines the safety of automatic spring-applied braking with the speed and industrial compatibility of pneumatic power, making it a robust and widely used solution for safety-critical holding and stopping in demanding industrial applications with a compressed air supply.

Hot Tags: qwz5-710/80 series pneumatic drum brake, China, manufacturers, supplier, factory, customized