YWZ4-500/B201 Explosion-proof Electro-hydraulic Drum Brakes

 

 

1. Product Overview

The YWZ4-500/B201 explosion-proof electro-hydraulic drum brake is a fail-safe heavy-duty shoe drum brake specially matched with the ED201/12 explosion-proof electro-hydraulic thruster. It serves as core safety braking equipment for winches, overhead cranes, gantry cranes and hoisting machinery operating in flammable and explosive hazardous areas. This brake adopts a split flameproof actuation system and double brake shoe clamping structure, fully compliant with national explosion-proof standards to eliminate ignition risks in gas and dust hazardous zones.

2. Main Model Parameter Explanation

YWZ4: Series code of electro-hydraulic block drum brake

500: Nominal diameter of matched brake drum: 500 mm

B201: Supporting explosion-proof electro-hydraulic thruster model ED201/12

Key Technical Specifications

Rated braking torque: Customizable maximum torque matching 500mm brake drum

Supporting thruster: ED201/12 explosion-proof electro-hydraulic thruster

Thruster rated thrust: 2000 N, rated stroke: 120 mm

Explosion-proof grade: Ex d IIB T4 Gb (gas hazardous zones Zone 1, Zone 2) / Ex tD A21 IP65 (combustible dust zones Zone 21, Zone 22)

Protection rating of overall brake unit: IP65

Applicable power supply: AC 380V/400V, 50/60Hz

Working ambient temperature: -30°C ~ +60°C

Allowable operation cycle: Max 2000 cycles per hour

Friction lining material: Asbestos-free high temperature resistant composite friction material

Fail-safe design: Spring force braking when power cuts off

3. Structural Composition

Explosion-proof ED201 electro-hydraulic thruster: Flameproof sealed motor and hydraulic assembly, provides power to release the brake; internal reset spring ensures automatic braking after power failure.

Brake base frame: Integral cast steel frame with high rigidity, resistant to vibration and deformation under heavy load frequent braking.

Double brake shoe assembly: Two symmetric brake shoes connected with hinge pins, equipped with wear-resistant friction linings. The linings can be replaced independently for easy maintenance.

Braking spring group: High-strength compression springs installed on both sides, the core power source for clamping brake shoes onto the drum.

Clearance adjustment mechanism: Hand-adjustable screw structure, convenient to calibrate the gap between friction lining and brake drum without disassembly.

Auxiliary optional parts: Manual release lever, lining wear detection switch, limit travel sensor for intelligent monitoring.

4. Working Principle

This drum brake follows a normally closed fail-safe working logic:

Power-off braking state (static standby): The explosion-proof thruster loses power, its internal hydraulic pressure disappears, and the built-in spring retracts the push rod. At the same time, the main braking springs push the two brake shoes to tightly clamp the outer surface of the 500mm brake drum. The friction torque locks the drum and prevents the hoisting drum from rotating, avoiding heavy load sliding accidents.

Power-on release state (equipment running): When the crane or winch starts to work, the control circuit energizes the ED201 explosion-proof thruster. The internal motor drives the hydraulic pump to build pressure, pushing the thruster rod to extend outward. The push rod drives the brake shoe linkage mechanism to overcome the spring preload, separating the two brake shoes from the brake drum. No friction resistance exists, and the brake drum can rotate freely with the hoisting mechanism.

Emergency braking state: Once power supply fails suddenly, hydraulic leakage or control system fault occurs, the thruster immediately loses pressure, the main springs rapidly drive the brake shoes to clamp the drum and realize emergency locking, effectively protecting personnel and heavy cargo safety.

5. Core Product Advantages

Complete explosion-proof certificationThe matched ED201 thruster has official flameproof certification. The fully sealed explosion-proof motor enclosure isolates internal electric sparks, which will not ignite surrounding flammable gas, steam or combustible dust. It can be safely used in chemical plants, coal mines, oil depots, grain processing plants and other explosive hazardous sites.

Reliable fail-safe safety designAll braking force comes from mechanical springs, completely independent of electricity and hydraulic pressure. It can achieve instant locking under any power failure condition, meeting the mandatory safety standards for lifting machinery.

Stable braking performanceMatched with 500mm large-diameter brake drum, the contact area of friction linings is sufficient. The output braking torque is stable, with low braking impact and no obvious load shaking during stopping. The high-temperature resistant friction pads are not easy to fade after long-time frequent braking.

Easy installation and maintenanceIndependent replaceable friction linings, external clearance adjustment screws, no need to disassemble the whole brake frame for daily gap calibration. The explosion-proof thruster adopts standard connection size, convenient for quick disassembly and replacement.

Strong environmental adaptabilityIP65 whole machine protection prevents dust accumulation and high-pressure water splashing invasion. The cast steel frame resists corrosion and vibration, adapting to dusty, humid, low-temperature industrial working conditions.

6. Typical Application Scenarios

Explosion-proof overhead cranes, gantry cranes and portal cranes in chemical, petroleum and coal industries

Mine explosion-proof hoists and underground transport winches

Grain, flour and feed processing plant lifting equipment (combustible dust environment)

Paint workshops, gas storage stations and other flammable gas production workshops

All kinds of heavy-duty hoisting machinery requiring explosion-proof safety certification

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