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.
