BEd80/6 Series Explosion-Protected Electro-Hydraulic

The BEd80/6 is an Exd I explosion-protected electro-hydraulic thruster with 800 N rated thrust and 60 mm stroke, designed for underground coal mines to actuate drum/disc brakes on conveyors, hoists, and other mining equipment in 瓦斯 /coal dust explosive atmospheres.

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Core Specifications

Parameter	Typical Value
Rated thrust	800 N (80 kgf)
Rated stroke	60 mm
Motor power	290–330 W (three-phase, 380 V/660 V/1140 V, 50 Hz)
Action time	Rise: ~0.5 s; Decline: ~0.49 s
Max cycles	1500 cycles/hour
Explosion-proof mark	Exd I (complies with GB3836.1/2-2010)
Insulation/Protection	F class / IP55–IP65
Operating temp	-20 °C to +40 °C (≤2000 m altitude)
Weight	~18–20 kg

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Structure & Working Principle

Integrated design: Explosion-proof motor + centrifugal pump + cylinder + pushrod; flameproof housing with sealed joints and certified cable glands.

Operation:

Power-on: Motor drives the impeller to generate pressure, lifting the piston/pushrod to compress the brake spring (release brake).

Power-off: Impeller stops; piston descends under spring/gravity, oil returns, and the brake engages.

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Key Advantages

Flameproof safety: Exd I certification for coal mine use; flameproof joints and sealed housing prevent ignition sources.

Compact & efficient: Self-contained oil tank eliminates external piping; low power consumption and fast response.

Durable: F-class insulation, corrosion-resistant shafts, and double seals for long service life.

Dual-duty: Suitable for S1 continuous or S3 intermittent (≤60% duty cycle) operation.

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Applications

Primary: Actuate YWZ/BYWZ series block brakes and drum/disc brakes for mine belt conveyors, hoists, and underground transport vehicles.

Secondary: Operate valves, ratchets, and levers in coal mines (install in dedicated chambers).

Industries: Mining, metallurgy, and heavy material handling with explosive risks.

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Installation & Maintenance

Installation:

Mount on a rigid base; align pushrod with the brake lever to avoid lateral loads.

Use certified explosion-proof cables and proper grounding; keep flameproof surfaces clean and undamaged.

Fill with clean ISO VG 32/46 hydraulic oil to the level mark; bleed air before commissioning.

Maintenance:

Daily: Check oil level, leaks, and abnormal noise; clean the surface and air breather.

6 months: Inspect oil quality; replace if degraded/contaminated.

12 months: Overhaul seals, check motor insulation (≥2 MΩ), and verify flameproof joint gaps.

Never modify flameproof components or use non-approved parts.

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Common Faults & Fixes

Fault	Possible Cause	Repair
No thrust	Motor reversal, clogged filter, or impeller damage	Correct motor phase; replace filter/impeller
Slow action	Low oil level, air in system, or worn seals	Refill oil; bleed air; replace seals
Unstable pressure	Leaking joints or stuck relief valve	Tighten joints; clean/replace valve core
Motor overheating	Overload, voltage imbalance, or bearing wear	Reduce duty cycle; correct voltage; replac

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