1. Model Code Explanation
QWZ5: Series code, Q=Pneumatic, W=Drum brake, Z=Spring closed fail-safe structure, 5=improved new generation pneumatic drum brake series
500: Matching brake drum nominal diameter: Φ500 mm
63: Equipped with QG-63 single-acting pneumatic cylinder (cylinder specification 63#)
2. Working Principle (Normally Closed Fail-Safe, Spring Brake / Air Release)
Air cut-off / Braking state (parking & emergency stop):No compressed air input; main compression springs pull brake arms tightly, press two brake shoes against Φ500 brake drum to generate fixed braking torque; auto locking under air source failure for equipment anti-slip safety.
Air feed / Brake release (equipment running):Compressed air (0.5~0.7MPa) enters QG63 air cylinder, cylinder piston extends to overcome spring preload, push brake arms to open brake shoes away from brake drum; brake drum rotates freely without friction drag.
3. Main Technical Parameters
表格
| Item | Technical Data |
|---|---|
| Matched brake drum | Φ500mm |
| Supporting cylinder | QG63 standard pneumatic cylinder, working air pressure: 0.5~0.7 MPa |
| Rated adjustable braking torque | 3200~5000 N·m (adjust via spring preload with scale indicator) |
| Ambient working temp | -20℃ ~ +50℃, ambient humidity ≤90% |
| Duty cycle | Standard S3 intermittent 60%, max switching frequency ≤900 cycles/h |
| Friction lining | Snap-in non-asbestos semi-metallic lining (hard/soft optional) |
| Executive standard | Mounting dimension: GB6333-86; Technical requirement: JB/T6406-2006 |
4. Core Structural Advantages
Interlocking automatic equal clearance device: Real-time balance gap of two-side brake shoes, no frequent manual clearance adjustment, avoid unilateral lining dragging & abnormal wear.
All hinge pivots fitted with self-lubricating bushing: No regular grease maintenance, high transmission efficiency & long service life.
Closed protective spring housing with torque scale: Directly read spring preload value to adjust braking torque conveniently.
Snap-in quick-replace brake lining: Replace friction pads without disassembling whole brake frame, shorten maintenance downtime greatly.
Compact QG63 cylinder: Quick response, stable air driving performance, anti-leakage design.
5. Optional Accessories
K1: Brake release travel limit switch; K2: Closed brake position switch; K3: Lining wear monitoring switch
M: Automatic lining wear compensation device
S: Manual emergency release lever for onsite maintenance
6. Application Scope
For machinery with stable compressed air supply system:
Belt conveyor head/tail wheel safety parking & service braking (mine, bulk port conveying)
Medium & heavy gantry/portal crane trolley, luffing mechanism brake
Metallurgical rolling auxiliary equipment, bulk loading machinery deceleration lock
