CQPL15-A Series Pneumatic Disc Brake

The CQPL15-A series pneumatic disc brake is a normally-open, air-actuated clamping-type braking device designed for low-to-medium torque industrial drive systems. It fully complies with the JB/T10917-2008 standard for caliper disc brakes and is optimized for parking, deceleration, and tension control scenarios. With a compact structure, fast response, and easy maintenance, it is widely used in non-explosive environments such as paper, printing, metallurgy, and wire & cable industries-especially for tension control of winding/unwinding mechanisms like paper webs, steel strips, and cable reels.

Core Technical Specifications

Parameter	Standard Value	Notes
Brake Type	Pneumatic clamp-on disc brake (normally-open, air-applied, spring-released)	Opposite to QPL series; relies on air pressure for braking, spring for release
Applicable Disc Diameter	180–280 mm	Matches small-to-medium industrial equipment disc specifications
Rated Braking Torque	150–300 N·m	Adjustable via air pressure (0.4–0.6 MPa); meets low-to-medium load demands
Operating Air Pressure	0.4–0.6 MPa	Compatible with standard industrial air supply systems (air station connection available)
Matching Air Cylinder	Integrated mini-cylinder	Ensures fast response: braking time ≤0.3 s, release time ≤0.2 s
Friction Lining Material	Non-asbestos high-wear composite	Friction coefficient ≥0.36 (stable for tension control); low heat fading (≤12% at 200℃); service life ≥2500 working hours
Protection Class	IP54	Dustproof and water-resistant; adaptable to workshop humidity (≤90%)
Working Conditions	- Ambient Temperature: -20℃～+50℃- Duty Cycle: S3-60% (intermittent operation)- Altitude: ≤1000m	No flammable, explosive, or corrosive gases
Key Structural Dimensions (mm)	Caliper width: 160; Mounting hole spacing: 100; Overall height: 200	Compact design for narrow installation spaces (e.g., near winding reels)
Weight (w/o Disc)	~15 kg	Lightweight for easy mounting on precision equipment

Key Structural & Functional Features

Normally-Open Air-Actuated Design (Core Differentiator)Unlike the normally-closed QPL series (spring braking, air release), the CQPL15-A adopts "air-applied braking + spring release" (Summaries 1, 3, 4). When compressed air is supplied (0.4–0.6 MPa), it drives the integrated cylinder to clamp the disc for braking/tension control; when air is cut off, the reset spring instantly separates the linings from the disc-avoiding unintended braking during power/air supply failure, which is critical for continuous production lines (e.g., paper printing).

Tension Control OptimizationExcels at winding/unwinding tension control (Summaries 1, 3). By adjusting air pressure to regulate clamping force on the disc, it maintains constant tension for materials like paper webs, steel strips, and cables-preventing stretching, wrinkling, or breakage. The stable friction coefficient (≥0.36) ensures consistent tension output even under frequent start-stop cycles.

Quick-Change Spring-Loaded LiningsFriction linings use a spring-loaded card-mounted structure (Summaries 1, 4). Replacement only requires unlocking the lining clamp (no tools needed for disassembly), removing the old lining, and snapping in a new one-total time ≤5 minutes. This is 60% faster than traditional bolted linings, minimizing downtime for production lines.

Compact & Low-Maintenance Integration

The caliper and air cylinder are integrated into one unit, reducing overall volume by ~35% compared to split-type brakes-ideal for equipment with limited space (e.g., small wire winding machines).

Self-lubricating bushings in caliper hinges eliminate the need for regular grease filling; the non-asbestos linings are oil/dust-resistant, lowering maintenance workload (average maintenance interval ≥3 months).

Compatibility with Existing Air SystemsNo need for independent power sources-can be connected to on-site air stations (Summaries 1, 3). This reduces installation costs and avoids the need for additional air compressors, making it easy to retrofit into existing production lines (e.g., upgrading old paper machine tension brakes).

Working Principle (Air Braking + Spring Release)

The CQPL15-A operates based on pneumatic force transmission and spring reset, aligned with the basic logic of pneumatic disc brakes (Summaries 5, 6):

Brake Application (Braking/Tension Control)When the control system supplies compressed air (0.4–0.6 MPa) to the integrated cylinder, the cylinder's piston rod extends to push the caliper's moving jaw. This overcomes the reset spring force, driving the friction linings to clamp the disc. For tension control (e.g., paper unwinding), adjusting air pressure changes the clamping force-higher pressure for greater tension, lower pressure for softer tension-ensuring stable material feeding.

Brake Release (Equipment Operation)When the equipment needs to run or tension control is no longer required, the air supply is cut off. The reset spring rebounds instantly, pulling the caliper jaws apart and separating the linings from the disc. The disc can rotate freely, allowing the equipment to operate normally. In case of air supply failure, the spring automatically releases the brake-preventing production line shutdown due to unintended clamping.

Heat Dissipation Collaboration (for High-Frequency Use)For scenarios with frequent braking (e.g., steel strip unwinding), it can be paired with an optional coolant circulation system (Summary 2). The friction-generated heat is transferred to the disc, then dissipated via coolant flowing through built-in channels-avoiding lining hardening or torque loss caused by overheating.

Typical Applications (Aligned with CQPL Series Scenarios)

Based on Summaries 1, 3, 4, the CQPL15-A is widely used in precision tension control and low-to-medium torque braking scenarios:

Paper & Printing Industry

Paper web tension control: Installed on paper machine rewinding units to maintain constant tension during paper rolling, preventing paper breakage or uneven reel tightness.

News printing tension control: Ensures stable tension of news paper rolls during printing, avoiding misalignment or ink smudges caused by tension fluctuations.

Metallurgy & Sheet Metal Processing

Steel strip/copper strip unwind control: Used on cold rolling mill unwinding mechanisms to keep steel strips taut without stretching, ensuring consistent feeding into processing equipment.

Aluminum foil tension braking: Prevents wrinkles during aluminum foil winding, maintaining the flatness of finished products.

Wire & Cable Industry

Cable reel unwind tension control: Maintains stable tension during cable extrusion, avoiding uneven wire diameter caused by excessive tension.

Wire drawing tension control: Ensures uniform tension for metal wires during drawing, reducing breakage rates.

General Industrial Machinery

Small conveyors (e.g., electronic component assembly lines): Provides parking braking with fast release, adapting to high-frequency start-stop cycles.

Miniature winches for light loads (≤3 tons): Compact design fits into narrow installation spaces, ensuring safe stopping and smooth operation.

Installation 

Installation Key Points

Disc Alignment: Ensure the disc is coaxial with the caliper (radial runout ≤0.1 mm); misalignment will cause uneven lining wear and unstable tension. The disc thickness should be 6–10 mm (compatible with caliper clamping range).

Cylinder Mounting: Install the brake horizontally (per manufacturer marks), with the air inlet facing upward to prevent moisture accumulation in the cylinder. The mounting surface must be flat (flatness error ≤0.3 mm/m) to avoid caliper jamming.

Air Circuit Configuration: Connect the air supply via a filter-regulator-lubricator (FRL) unit (Summary 2, 5) to remove moisture/impurities and lubricate the cylinder. Install a pressure gauge to monitor real-time pressure (maintain 0.4–0.6 MPa); add a quick-exhaust valve near the cylinder to speed up release.

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