QP Series Fail-Safe Air Loss Lock Pneumatic Disc Brake

QP Series Fail-Safe Air Loss Lock Pneumatic Disc Brake

QP series pneumatic disc brake is a spring-applied fail-safe caliper brake specially designed for outdoor port machinery and inclined belt conveyors. Different from CQP normally-open air brakes, QP relies on compressed air to open the brake pads; once air pressure drops, pipeline fails or air supply shuts down, powerful built-in springs immediately clamp the brake disc tightly. It delivers strong static holding torque to lock equipment steadily, solving the hidden danger of trolley sliding caused by strong coastal winds for RTG and outdoor conveyors. The open disc structure brings superior heat dissipation compared with traditional drum brakes, suitable for long-term continuous heavy-duty operation.

Core Competitive Advantages

• Air-loss automatic locking & excellent windproof performance (Core Selling Point)
• High-strength pre-compression springs provide large static braking torque. When air supply is interrupted unexpectedly, the brake instantly clamps the brake disc without delay. Firmly lock the wheel sets of rubber-tyred gantry cranes and stop the reverse sliding of inclined belt conveyors, effectively resisting strong crosswinds in open-air port yards. Avoid equipment collision, cargo tipping and material backflow during unattended parking.
• Outstanding heat dissipation, no thermal fading under frequent braking
• Open exposed disc design quickly dissipates heat generated during repeated deceleration and long-hour operation. Braking torque will not decline due to overheating, perfectly matching high-duty-cycle loading/unloading work of port RTG and continuous running of mining conveyors. Stable clamping force greatly extends brake pad service life.
• Oil-free pneumatic drive, zero hydraulic leakage faults
• Cylinder-driven structure without hydraulic oil, completely get rid of common problems of electro-hydraulic brakes such as oil leakage, seal aging and oil deterioration. No regular oil replacement or sealing maintenance, greatly reduce long-term operation and maintenance costs for port and mining workshops.
• Automatic pad wear compensation structure
• Built-in compensation mechanism automatically adjusts clearance as friction pads wear down. No frequent manual gap calibration required, always maintain consistent braking distance and stable holding force, lower daily maintenance workload of equipment teams.
• Low-maintenance modular design
• All swing hinge points adopt maintenance-free self-lubricating bearings, regular greasing is not needed;
• Snap-in quick-replace brake pads, can be replaced without disassembling the entire brake body, saving more than 60% maintenance time;
• Torque adjustable via spring preload, adapt different container loads, wind resistance and conveyor material weight demands.
• Customized matching options
• Standard working air pressure: 0.5–0.7 MPa, compatible with standard factory compressed air systems. Explosion-proof versions available for chemical plants and underground coal mine hazardous zones. Optional accessories include manual emergency release lever, travel limit switches for PLC safety interlock, IP65 dust & rain protective covers and anti-corrosion coating for coastal salt fog environments. Multiple installation brackets support vertical and horizontal assembly for RTG and conveyor layout.

Main Application Scenarios

Port rubber-tyred gantry cranes (RTG), rail-mounted outdoor gantry cranes, port yard travel trolleys, large inclined mining belt conveyors, metallurgical heavy transport machinery and all outdoor equipment requiring windproof parking and air-source fail-safe braking.

Working Condition Parameters

Ambient temperature: -20℃ ~ +50℃, applicable to coastal high-wind, high-humidity open-air environments

Standard operating air pressure: 0.5–0.7 MPa

Compliant with JB/T 10917 industrial pneumatic brake standard

Optional explosion-proof grades: Ex d I (coal mine), Ex d IIB T4 (chemical plant)

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