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.
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 |
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.
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.
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.
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.
