QW710-100 Series Pneumatic Drum Brake

The QW710-100 (also written as QW710/100) Series is a heavy-duty, spring-applied, pneumatically released industrial drum brake, mainly produced by Chinese manufacturers (e.g., Zhongyuan Brake, Jiaozuo Jingu) and widely used in large material-handling equipment.

Model Nomenclature

QW: Standard QW-series pneumatic drum brake;

710: Brake drum diameter = 710 mm;

100: Matched QG100-120 air cylinder (100 mm bore, 120 mm stroke).

Core Specifications

Braking Torque: 4000–8000 N·m, weight approx. 408 kg;

Operating Pressure: Typically 0.5–0.7 MPa (pneumatic release);

Ambient Temperature: -20°C to +50°C (can be customized for -25°C);

Standards Compliance: JB/T 6406-2006, DIN 15435;

Fail-safe Design: Normally closed (spring braking when air pressure is lost, pneumatic pressure releases the brake), critical for safety.

Key Structural & Performance Features

Interlocking automatic clearance equalization to prevent uneven pad wear and one-side drag;

Main pivot points use self-lubricating bearings, high transmission efficiency, no need for in-service lubrication;

Cartridge-type brake pads (asbestos-free semi-metallic hard/soft options) for quick replacement;

Spring force marked with a scale for easy torque reading without complex calculation/measurement.

Typical Applications

Ideal for heavy machinery with a reliable air supply, including:

Cranes (bridge, gantry, port container cranes);

Belt conveyors in mines/quarries;

Port loading/unloading equipment;

Metallurgical rolling mill auxiliary drives.

Installation & Maintenance Notes

Ensure drum diameter is strictly 710 mm, surface finish and runout meet DIN15435;

Pneumatic lines must have filters, regulators, lubricators (FRL) to prevent cylinder damage;

Regularly check pad thickness, automatic clearance adjustment function, and air leakage;

When replacing pads, reset the clearance mechanism according to the manufacturer's manual.

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