DYW300-750 Series Explosion Protected Electro-hydraulic Drum Brakes

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.

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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)

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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).

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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.

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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.

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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.

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Common Faults & Fixes

Fault	Possible Cause	Repair
Weak braking	Worn liners, broken return spring, loose thruster	Replace liners/springs; retighten thruster
Drag/overheating	Clearance imbalance, stuck shoes, thruster leakage	Check auto-balancer; clean/lubricate shoes; repair seals
Unstable torque	Spring fatigue, incorrect compression	Replace spring; readjust compression
Thruster failure	Motor reversal, clogged filter, impeller damage	Correct phase; replace filter/impeller

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Safety & Compliance

Certified by China Mining Products Safety Approval and Certification Center (CMA).

Strictly follow GB3836.1/2-2010 for flameproof maintenance; never use non-approved spare parts.

Use only explosion-proof cables and ensure proper grounding to prevent static ignition.

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