YWZ5-160/B30 Series(Explosion-proof) Electro-hydraulic Drum Brakes

The YWZ5-160/B30 Series (Explosion-proof)​ is a modular, spring-applied, hydraulically released external drum brake system engineered for operation in hazardous areas. It represents a standardized, widely adopted design that combines a powerful brake caliper with a remotely mounted, explosion-protected hydraulic power unit to provide safe, adjustable, and reliable braking for industrial machinery in explosive atmospheres.

Core Design Philosophy: A Modular Safety System

This is not a single integrated unit, but a system comprised of two main, separable components:

1. YWZ5-160 Brake Caliper Assembly:​ A mechanical brake shoe assembly designed to act on the external surface of a brake drum.
2. B30 Series (Explosion-proof) Electro-hydraulic Thrustor:​ A separate, certified power unit that supplies hydraulic pressure to release the brake.

This modular approach allows for flexible installation, easier maintenance, and the use of a single, centrally located thruster to power multiple brake calipers if needed.

Working Principle (Fail-Safe, Spring-Applied, Hydraulically Released)

The system operates on the fundamental SAHR (Spring-Applied, Hydraulically Released) principle, which is ideal for safety in hazardous locations:

• Brake Application (Default/Safe State):​ A powerful internal spring (or springs) within the YWZ5-160 caliper​ forces the brake shoes against the drum, creating the braking torque. The brake is normally engaged.
• Brake Release (Powered State):​ When energized, the explosion-proof B30 thruster​ activates. Its electric motor drives a pump to generate hydraulic pressure. This pressure is transmitted via a hydraulic hose to a hydraulic cylinder (often an integral part of the caliper or a separate unit). The cylinder compresses the main brake spring, retracting the shoes and releasing the brake.
• Automatic Emergency Braking:​ Upon any failure (power loss, hydraulic leak, manual emergency stop), the pressure from the thruster is released. The compressed brake spring immediately reasserts its force, applying the brake automatically and without delay.

Key Features & Specifications

• Explosion-Proof Power Source:​ The B30 Thruster​ is the certified component. It is typically rated to standards such as Ex d IIC T4 Gb​ (flameproof for gases) and Ex tD A21 IP66 T135°C Db​ (dust ignition protected). Its motor, pump, and electrical connections are housed within a flameproof/explosion-proof enclosure.
• Brake Caliper Specifications:
• YWZ5-160:​ The "160" typically denotes the brake drum diameter in millimeters​ (160mm). The "5" refers to the design series/model.
• Adjustable Braking Torque:​ The caliper features an adjustment mechanism (e.g., a handwheel or adjusting bolts) to set the position of the brake shoes, compensating for wear and setting the initial clearance (air gap).
• High Braking Force:​ Designed for substantial braking torque, suitable for stopping and holding medium to heavy loads.
• Modularity & Flexibility:​ The separation of the thruster and caliper allows the thruster to be mounted in a protected, accessible location, while the caliper is mounted directly at the point of action on the machinery. They are connected by standard hydraulic hoses.
• Manual Release Provision:​ The B30 thruster or the hydraulic circuit includes a manual release screw/valve. This allows maintenance personnel to mechanically release hydraulic pressure and thus the brake for servicing, positioning, or in case of power unit failure.

Typical Technical Data

• Brake Drum Diameter:​ 160 mm.
• Braking Torque:​ Ranging from approximately 50 Nm to 200 Nm, depending on the specific spring configuration and adjustment.
• B30 Thruster Motor:​ Ex d certified, typically 0.18 kW - 0.37 kW, 380V/415V 3-phase, 50Hz.
• Thruster Thrust:​ B30 series typically provides thrust in the range of 300N - 500N.
• Release Time:​ Adjustable, usually between 0.3 to 1.5 seconds.
• System Protection:​ IP55 or IP65 for the caliper, IP66 for the thruster.

Primary Applications

This series is designed for safety-critical braking in hazardous locations (ATEX/IECEx Zones 1, 2, 21, 22)​ on:

• Small to Medium Overhead Cranes & Hoists​ in chemical processing areas, spray booths, and solvent handling facilities.
• Conveyors, Mixers, and Agitators​ in pharmaceutical, food (dust hazards), and cosmetic plants.
• Winding Drums and Capstans​ in marine and offshore environments.
• Machine Tools and Processing Equipment​ located in classified zones.

Advantages

• Certified Safety:​ The use of a certified B30 explosion-proof thruster makes the entire braking system compliant for hazardous area use.
• Proven Modular Design:​ The YWZ brake caliper is an industry-standard design, known for its reliability and ease of adjustment.
• Inherent Fail-Safe Operation:​ The SAHR principle guarantees automatic braking in any failure mode.
• Ease of Maintenance & Service:​ Components can be serviced or replaced independently. Brake shoe wear is easily adjustable.

Summary

The YWZ5-160/B30 Series (Explosion-proof) Electro-hydraulic Drum Brake​ is a versatile and highly reliable modular braking system for hazardous environments. It pairs the standard, mechanically robust YWZ5-160 drum brake caliper with a certified B30 explosion-proof hydraulic thruster. This combination delivers certified safety, flexible installation, and guaranteed fail-safe braking for equipment where reliable stopping is essential for personnel safety and asset protection in the presence of explosive gases or dusts.

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