The DYW300-750 is an Exd I explosion-protected electro-hydraulic drum brake (rated drum diameter 300 mm, braking torque 750 N·m), designed for underground coal mines and explosive atmospheres to provide fail-safe deceleration/parking braking for conveyors, hoists, and mining equipment, certified to GB3836.1/2-2010 and MT912-2008.
Core Specifications
| Parameter | Value |
|---|---|
| Drum diameter | 300 mm |
| Rated braking torque | 750 N·m |
| Matched thruster | BEd80/6 (800 N thrust, 60 mm stroke) |
| Explosion-proof mark | Exd I |
| Brake clearance | 0.8–1.2 mm (auto-balanced) |
| Friction lining | Non-asbestos, clamped integral type |
| Max cycles | 1500 cycles/hour |
| Ambient temp | -20 °C to +40 °C |
| Weight | ~45–50 kg |
| Installation | Horizontal; interchangeable with BYWZ5 (same center height) |
Structure & Working Principle
Structure: Explosion-proof thruster + brake frame + left/right brake shoes + return springs + auto-clearance balancing device + sealed spring tube + self-lubricating hinges.
Fail-Safe Operation:
Power-on: Thruster lifts pushrod, compresses brake spring, retracts shoes (brake released).
Power-off: Thruster loses pressure; return springs push shoes against drum (brake engaged).
Key Advantages
Flameproof safety: Exd I certification for coal mines; sealed flameproof joints prevent ignition sources.
Auto-balanced clearance: Interlocking device maintains even shoe clearance, avoiding one-sided sticking.
Low maintenance: Self-lubricating hinges (no lubrication needed); quick-clamp liners for fast replacement.
Stable torque: Closed spring tube protects springs; torque adjustable via spring compression.
High reliability: Complies with GB6333-86, JB/T6406-2006, and MT912-2008; mining safety mark certified.
Applications
Primary: Deceleration and parking braking for coal mine belt conveyors, hoists, and underground transport vehicles.
Secondary: Suitable for metallurgy, ports, and heavy material handling with explosive risks; replaces BYWZ5 brakes in same-mount setups.
Installation & Maintenance
Installation:
Mount on a rigid base; ensure drum concentricity (runout ≤0.15 mm) and thruster pushrod alignment.
Use certified explosion-proof cables and proper grounding; keep flameproof surfaces clean/undamaged.
Fill thruster with ISO VG 32/46 hydraulic oil to level mark; bleed air before commissioning.
Maintenance:
Daily: Check thruster oil level, leaks, and abnormal noise; clean surface and air breather.
6 months: Inspect oil quality; replace if degraded.
12 months: Overhaul thruster seals; check motor insulation (≥2 MΩ); verify flameproof joint gaps.
Replace liners when thickness <5 mm; never modify flameproof components.
