YWZ9-500/E80A Electro-hydraulic Drum Brakes

The YWZ9-500/E80A is a heavy - duty electro - hydraulic drum brake (500 mm drum diameter, paired with ED80/6 thruster), ideal for working and parking braking of large cranes, hoists, and heavy - duty conveyors. It has a rated braking torque of 1250 N·m (adjustable 800-1600 N·m) and features automatic clearance equalization and fail - safe performance.

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Core Specifications

Parameter	Value
Drum diameter	500 mm
Rated braking torque	1250 N·m (adjustable: 800-1600 N·m)
Matched thruster	ED80/6 (800 N thrust, 60 mm stroke)
Brake clearance	0.8-1.2 mm (auto - equalized by interlocking mechanism)
Friction lining	Non - asbestos, thickness 18 mm (replace when ≤5 mm)
Operating system	Normally closed (spring - applied, electro - hydraulic released)
Ambient temp	-20 °C to +50 °C
Relative humidity	≤90%
Weight	~118 kg
Installation center height	365 mm
Insulation class	B (thruster motor)
Action frequency	Up to 1200 times/hour
Standards	GB6333-86, JB/T6406-2006, DIN15430

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Structure & Working Principle

Structure: Reinforced brake frame + left/right brake shoes + high - stiffness return spring + interlocking clearance equalization mechanism + ED80/6 electro - hydraulic thruster + fixed base. Self - lubricating bearings at main hinges ensure high transmission efficiency and no need for lubrication. A torque scale on the spring tube enables intuitive adjustment.

Fail - Safe Operation:

Power - on (release): Thruster motor starts, hydraulic pressure pushes the pushrod upward. The lever mechanism retracts the brake shoes, compresses the return spring, and the brake releases.

Power - off (braking): Thruster loses power, the pushrod retracts under spring force and gravity. The return spring rebounds, driving the shoes to clamp the drum for stable braking.

Clearance Equalization: The interlocking mechanism keeps the clearance on both sides of the shoes equal, preventing uneven wear and brake drag.

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Key Advantages

Reliable safety: Normally closed design ensures immediate braking on power failure, preventing equipment sliding.

Low - maintenance: Self - lubricating hinges and interlocking clearance equalization reduce manual intervention; plug - in liners allow quick replacement without disassembling the frame.

Stable performance: Non - asbestos liners with a friction coefficient of μ≈0.35-0.4 and good high - temperature resistance.

Intuitive adjustment: The torque scale on the spring tube makes braking torque adjustment easy and direct.

High action frequency: Suitable for frequent start - stop working conditions in heavy - duty applications.

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Applications

Primary: Working and parking braking for large bridge cranes, gantry cranes, large electric hoists, and heavy - duty belt conveyors in factories, ports, and mining areas.

Secondary: Braking for main and auxiliary mechanisms (slewing, luffing, etc.) of lifting and material handling equipment in metallurgy, coal, and chemical industries.

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Installation & Maintenance

Installation:

Install on a rigid base to avoid vibration. Ensure drum concentricity (runout ≤0.15 mm) and thruster pushrod alignment (no lateral force).

Connect the thruster to a 380 V three - phase power supply and fill it with ISO VG 32/46 hydraulic oil to the specified level.

Verify the operation of the clearance equalization mechanism and test the flexibility of braking and release before commissioning.

Maintenance:| Cycle | Maintenance Items || ---- | ---- || Daily | Check thruster oil level, pipeline leaks, and abnormal noise; clean oil stains and debris on the drum surface. || 3 months | Inspect liner wear and thruster seal integrity; tighten loose fasteners (lever and base bolts). || 6 months | Replace thruster hydraulic oil; check return spring elasticity (replace if fatigued). || 12 months | Overhaul the thruster (clean the pump and piston); replace liners if thickness <5 mm; resurface the drum if worn or deeply scratched. || 2 years | Replace thruster seals and filter; inspect the brake frame for deformation; calibrate braking torque. |

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Common Faults & Fixes

Fault	Possible Cause	Repair
Weak braking	Worn liners, spring fatigue, or equalization mechanism jam	Replace liners; adjust/replace the spring; clean/lubricate the equalization mechanism.
Brake drag/overheating	Equalization mechanism jam, stuck pushrod, or oil on the drum	Clean equalization parts; lubricate the pushrod; clean the drum surface.
Thruster fails to extend	Motor phase reversal, clogged filter, or low oil level	Correct motor phase; replace the filter; refill hydraulic oil.
Unstable braking torque	Uneven shoe wear or drum deformation	Replace unevenly worn liners; grind the drum surface.
Abnormal noise during braking	Loose shoes or damaged liners	Tighten shoe fasteners; replace cracked liners.

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