YWZ5-200/B30 (Explosion-proof) Electro-hydraulic Drum Brakes

YWZ5-200/B30 (Explosion-proof) Electro-hydraulic drum brakes

The YWZ5-200/B30 is a heavy-duty, Explosion-Protected (Flameproof) electro-hydraulic drum brake. It is designed for braking and holding mechanisms in hazardous environments where explosive gases or coal dust are present. The "B" in the model designation typically indicates the integration of a Explosion-Proof (Flameproof) drive unit.

The model number breakdown is as follows:

YWZ5: The series designation for Explosion-Protected Electro-Hydraulic Drum Brakes (distinct from the standard YWZ series).

200: The Brake Wheel Diameter of 200 mm.

B30: Indicates the specific Explosion-Proof Thruster variant (likely corresponding to a 300N thrust class or specific stroke configuration compatible with the 200mm wheel).

💡 Key Features & Characteristics

Explosion-Proof Certification:
The unit is fully certified for hazardous locations, typically holding the MA (Coal Mine Safety Mark) and ExdI / ExdII certifications. This ensures that neither the electrical components (thruster motor) nor the mechanical friction sparks can ignite the surrounding atmosphere.

Fail-Safe Operation:

Braking (Closed): The brake is spring-applied. When power is cut, strong compression springs force the brake shoes against the drum to stop or hold the load.

Release (Open): When the integrated explosion-proof thruster is energized, it generates hydraulic pressure to overcome the spring force, retracting the brake shoes and allowing the machinery to move.

Maintenance-Free Linkage:

Self-Lubricating Bearings: The main pivot points are equipped with self-lubricating bearings, eliminating the need for manual greasing and ensuring smooth operation in dusty environments.

Equalizing Linkage: Features an interlocking equalizing mechanism that ensures both brake shoes retract and apply evenly, preventing "drag" on one side.

Visual Torque Adjustment:
The main spring is housed in a square tube with a graduated scale, allowing maintenance personnel to visually check and adjust the braking torque without complex calculations.

Easy Pad Replacement:
The brake pads (shoes) use a card-mounted (snap-in) structure, allowing for quick and easy replacement without disassembling the entire brake arm.

🏭 Typical Applications

The YWZ5-200/B30 is strictly used in hazardous industrial environments:

Coal Mining: Underground belt conveyors, winches, and hoists (ExdI rated).

Petrochemical: Refineries and chemical plants where flammable vapors exist (ExdII rated).

Ports & Terminals: Handling explosive bulk materials (grain dust, coal dust).

Metallurgy: Coke oven plants and gas production facilities.

📋 General Technical Specifications

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Note: The YWZ5 series is distinct because it is specifically engineered for explosive atmospheres. Unlike standard industrial brakes, the electrical junction boxes are sealed with rubber grommets, and the motor housing is reinforced. When replacing a unit, ensure the voltage (380V vs 660V) matches your supply and that the brake wheel diameter (200mm) matches your existing drum.

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