QP12.7-A Pneumatic Disc Brake

 

💡 Key Features & Characteristics

Fail-Safe "Normally Closed" Operation:

Spring-Applied, Air-Released: The braking force is generated by a set of powerful springs (typically 8 springs for the standard A-type). To release the brake (open the caliper), compressed air is supplied to the pneumatic cylinder to overcome the spring force. In the event of a power outage or air supply failure, the springs automatically engage the brake to secure the equipment.

Safety First: This fail-safe design makes it ideal for applications where holding a load safely during a power loss is critical.

High-Performance Specifications (QP12.7-A):

Rated Braking Force: Delivers a standard rated braking force of 6400 N (with 8 springs).

Working Air Pressure: Operates on a standard air pressure range of 5 to 7 bar.

Braking Torque: The actual braking torque is calculated as: Rated Braking Force × Effective Radius of the Brake Disc (Effective Radius = Brake Disc Radius - 0.03m).

Air Consumption: Requires a working air volume of 273 cm³ and a total air volume of 553 cm³ per actuation.

Robust & Maintenance-Friendly Design:

Eco-Friendly Pads: Uses non-asbestos brake pads (linings) with a spring-loaded clip-on structure, making them environmentally friendly, easy to replace, and quick to adjust.

Automatic Compensation (Optional): Certain variants (like the QP12.7-C) feature an automatic compensation mechanism that adjusts for pad wear, eliminating the need for manual gap adjustments.

Flexible Installation: Can be installed on both horizontal and vertical shafts. When installed on a horizontal shaft, it can be mounted at any angle around the brake disc. Multiple brakes can be installed on a single disc for increased torque (symmetrical installation is recommended).

Infinite Adjustment: No separate power source is needed; it can be connected directly to an existing air compressor station. By adding a speed control valve to the air supply line, the braking time can be adjusted infinitely for smooth deceleration.

Environmental Adaptability:

Designed to operate reliably in ambient temperatures ranging from -20°C to +40°C (some variants are rated for -40°C to +60°C). The compressed air supply must be dry, clean, and free of oil, water, and corrosive gases.

🏭 Typical Applications

The QP12.7-A is essential for a wide range of medium and small-sized industrial drives:

Lifting & Transport: Cranes, hoists, and general transport machinery.

Metallurgy & Mining: Steel rolling mills, mining equipment, and port machinery.

Tension Control Systems: Highly effective for tension braking in winding mechanisms, such as paper mills (paper roll tension), newsprint printing, steel coil unwinding, and cable/wire payout systems.

General Industry: Construction machinery and various automated production lines requiring precise stopping or holding.

📋 General Technical Specifications

表格

Parameter	Description
Type	Pneumatic Caliper Disc Brake
Model Series	QP Series
Model Variant	QP12.7-A
Brake Disc Thickness	12.7 mm
Rated Braking Force	6400 N (with 8 springs)
Working Air Pressure	5 - 7 bar
Braking Principle	Spring-Applied, Pneumatically Released (Normally Closed)
Ambient Temperature	-20°C to +40°C (Standard)
Key Features	Non-asbestos pads, fail-safe design, infinite braking time adjustment

Note: The QP12.7-A is a highly standardized and reliable braking component. When installing, ensure the compressed air supply is clean and dry to prevent cylinder damage. Because the braking torque depends heavily on the radius of the brake disc you choose (minimum recommended disc diameter is typically ≥200 mm), always verify that your selected disc size and the 6400 N clamping force meet the specific torque and safety requirements of your machinery.

Hot Tags: qp12.7-a pneumatic disc brake, China, manufacturers, supplier, factory, customized