YWZ5-710/B201 Explosion‑Protected Electro‑Hydraulic Drum Brake

YLZ series hydraulic wheel brakes

The YWZ5-710/B201 is a massive, heavy-duty electro-hydraulic drum brake specifically engineered for critical safety and operational braking in highly hazardous environments. It combines the robust mechanical structure of the YWZ5 series brake frame with a powerful, flameproof electro-hydraulic thruster to provide reliable, fail-safe braking for large-scale industrial machinery where flammable gases or explosive dust are present.

The model number breakdown is as follows:

• YWZ5: The series designation for a standard electro-hydraulic drum brake (compliant with GB 6333-86 installation dimensions and JB/T 6406-2006 technical standards).
• 710: Indicates the Brake Wheel Diameter of 710 mm, making it suitable for heavy-load applications.
• B: Indicates that the matched electro-hydraulic thruster is an explosion-proof (flameproof) type (e.g., a BEd series thruster).
• 201: Indicates the matched thruster provides a Rated Thrust Force of 20,100 N (approximately 2 tons).

💡 Key Features & Characteristics

• Explosion-Proof & Safety Certified:
  • Flameproof Thruster: The core driving component is a fully enclosed, explosion-proof electro-hydraulic thruster. It is engineered to contain any internal explosion and prevent it from igniting the surrounding hazardous atmosphere.
  • Hazardous Area Compliance: Designed for environments with flammable or explosive gases and dust. It carries strict safety certifications (such as the MA mark for mining applications or Exd standards for industrial gas atmospheres).
• High-Performance Specifications (YWZ5-710/B201):
  • Brake Wheel Diameter: Designed for a massive 710 mm brake wheel.
  • Driving Thrust: Powered by a B201 explosion-proof thruster delivering 20,100 N of linear force.
  • Power Supply: Operates on standard industrial 3-phase AC power, typically 380V at 50Hz (custom voltages like 660V or 1140V are often available for specific hazardous zones).
  • Duty Cycle: Capable of continuous operation (S1) or frequent intermittent duty (S3-60%, with an operating frequency of up to 1200 cycles/hour), making it highly suitable for demanding, repetitive braking cycles.
• Advanced Mechanical Design:
  • Fail-Safe Operation: Operates on a "power-to-release, spring-to-brake" principle. When powered, the thruster pushes the brake shoes open. Upon power loss, heavy-duty springs instantly clamp the shoes onto the wheel for emergency stopping.
  • Equal Clearance Mechanism: Features an interlocking linkage system that automatically keeps the clearance between the brake shoes and the wheel perfectly even on both sides. This prevents uneven wear or one brake lining from dragging against the wheel.
  • Self-Lubricating Bearings: The main pivot points are equipped with self-lubricating bearings, ensuring high transmission efficiency and a long, maintenance-free service life.
  • Quick-Change Linings: The brake pads (linings) use a secure, clip-on insert structure. They are available in various materials (including non-asbestos semi-metallic options) and can be replaced quickly and safely.
  • Visible Torque Adjustment: The main brake spring is housed in a square tube with a clear external scale, allowing maintenance personnel to easily read and precisely adjust the braking torque without complex calculations.
• Environmental Adaptability:
  • Designed to operate reliably in ambient temperatures ranging from -20°C to +50°C and in environments with relative humidity up to 90%.

🏭 Typical Applications

• Mining & Coal Processing: Used as the primary service and safety brake for underground belt conveyors, mine hoists, and winding engines where methane gas (firedamp) and coal dust are present.
• Oil & Gas / Petrochemical: Ideal for operating braking mechanisms on large cranes, winches, and emergency shutdown systems in refineries, chemical plants, and offshore platforms containing flammable vapors.
• Metallurgy & Heavy Industry: Applied in steel mills, ports, and foundries where industrial gases or combustible dust create explosive working environments requiring massive, reliable braking torque.

📋 General Technical Specifications

Note: The YWZ5-710/B201 is a vital life-saving device in hazardous areas. Before installation, it is crucial to verify the exact voltage configuration and specific explosion-proof certification against the manufacturer's nameplate to ensure it matches your site's hazardous area classification. Regular visual inspections of the flameproof enclosure, brake lining thickness, and the external torque scale are essential to maintain its safety integrity and optimal performance.

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