🛠️ Product Overview: YWZ4-800/B301 Explosion-Protected Drum Brake
The YWZ4 series is a widely used standard for industrial brakes. When combined with the "B" (Explosion-proof) thruster, it becomes a critical safety component for heavy machinery operating in areas with explosive gases or dust.
Model Number: YWZ4-800/B301
Type: Explosion-Protected / Electric Hydraulic Drum Brake
Action: Normally Closed (Fail-Safe)
Braking: Spring-applied (Engages when power is cut).
Release: Hydraulic pressure (from the BEd301 thruster) opens the brake.
Key Feature: Modular Design. The brake frame (YWZ4-800) is a standard component, while the "/B301" denotes the specific explosion-proof actuator driving it.
📋 Key Technical Specifications
表格
| Parameter | Specification for YWZ4-800/B301 |
|---|---|
| Brake Frame Size | 800 mm (Diameter of the brake drum/wheel) |
| Actuator (Thruster) | BEd301 (Explosion-Protected) |
| Thrust Force | ~3000 N (Determined by the BEd301) |
| Stroke | 120 mm (Typical for BEd301 models) |
| Maximum Torque | Up to 12,500 Nm (Estimated for this size class) |
| Explosion Protection | Exd I / Exd IIB T4 (Flameproof) |
| Power Supply | AC 380V / 660V (3-Phase, 50Hz) |
✨ Key Features
Fail-Safe Safety: Operates on a "Normally Closed" principle. If there is a power failure or hydraulic leak, the spring force automatically engages the brake, preventing uncontrolled movement.
Explosion-Proof Integrity: The BEd301 thruster is housed in a robust flameproof casing (typically steel or cast iron) that can withstand an internal explosion and prevent it from igniting the external environment (e.g., Methane gas or coal dust).
Long Service Life: Features chrome-plated piston rods and high-quality seals to resist wear and corrosion, even in harsh conditions.
Low Noise: Operates with lower noise levels compared to traditional electromagnetic brakes.
Maintenance Friendly: The brake features a manual release mechanism for easy adjustment and maintenance, and the lining can be quickly replaced.
🏭 Typical Applications
The YWZ4-800/B301 is used in heavy industries where both high torque and safety in hazardous environments are required:
Coal Mines: For belt conveyors and hoists in underground shafts.
Chemical Plants: For cranes and machinery handling flammable materials.
Port Machinery: For handling bulk materials that generate combustible dust.
Metallurgy: In areas with high dust levels or flammable gases.
💡 Operational & Maintenance Tips
Cable Glands: Ensure the cable entry points on the thruster are properly sealed to maintain the explosion-proof integrity. Never modify the housing.
Oil Level: Regularly check the hydraulic oil level in the BEd301 thruster. Use specified oils like DB-25 or YH-10 suitable for the operating temperature.
Lining Wear: Monitor the wear of the brake linings. Excessive wear can reduce the braking torque below the safety threshold.
Heating Option: In sub-zero environments, ensure the heating element (if installed) is functioning to prevent oil from gelling.
