YWZ4-400/B50 Mine Flameproof Crane Drum Brake

YWZ4-400/B50 (Explosion-proof) Electro-hydraulic Drum Brake Full Product Details

 

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1. Product Model Definition & Code Explanation

Full Model No.: YWZ4-400/B50 (Explosion-proof) Electro-hydraulic Drum Brake

YWZ4-400/B50 explosion-proof electro-hydraulic drum brake belongs to YWZ4 upgraded series normally closed flameproof braking equipment, driven by B50 explosion-protected electro-hydraulic thruster. It adopts spring-applied, power-off braking fail-safe principle. With optimized four-generation hinge structure, stable braking torque and reliable flameproof performance, it is widely used for overhead cranes, gantry cranes, belt conveyors and hoisting machinery in underground coal mines, chemical plants and other explosive hazardous locations. It can replace BYWZ explosion-proof drum brake for renovation projects.

Model Code Interpretation:

• YWZ4: 4th generation electro-hydraulic drum brake series
• 400: Brake drum diameter: 400 mm
• B50: Matched B50 explosion-proof electro-hydraulic thruster

2. Product Overview

YWZ4-400/B50 flameproof drum brake is assembled with B50 flameproof electro-hydraulic thruster as driving unit. When energized, the B50 thruster extends to overcome spring preload, driving the lever mechanism to separate brake shoes from brake drum and release the brake for equipment normal operation. Once power supply is cut off, the compression spring instantly pushes brake shoes to clamp the drum tightly for emergency braking.

The brake frame is cast with high rigidity, adopting self-lubricating hinge pins for flexible movement and low wear. Friction lining uses high-performance asbestos-free wear-resistant material. All electrical components of the supporting thruster adopt flameproof enclosure, which prevents internal electric sparks and arcs from igniting surrounding flammable gas mixtures. Optional explosion-proof limit switches can feedback brake opening/closing signals to realize electrical interlock with main machine control system. It adapts to long-cycle operation under dusty, humid underground mine conditions.

3. Core Features & Product Advantages

• Certified Flameproof Explosion-Proof Design Supporting B50 thruster with flameproof housing, explosion mark Ex d I Mb, Ex d IIB T4, safe for methane coal mine and chemical explosive hazardous zones.
• Upgraded YWZ4 Structure with Self-Lubricating Hinges Four-generation optimized brake arm structure, self-lubricating hinge points, flexible action, small friction loss, suitable for frequent start-stop cyclic working conditions.
• Fail-Safe Normally Closed Spring Braking Spring-applied braking, power-off instant emergency stop. Effectively prevents runaway accidents of cranes, hoists and belt conveyors during power failure.
• High Wear-Resistant Non-Asbestos Brake Lining Stable friction coefficient, low noise, heat resistance, long service life and convenient disassembly & replacement.
• Interchangeable with BYWZ Explosion-Proof Brake Standard installation dimension, convenient for direct replacement and technical upgrade of old BYWZ braking systems.
• Optional Signal Feedback & Interlock Protection Can be equipped with explosion-proof limit switches to transmit brake released / closed status signals, realizing interlock control with host equipment.
• Strong Adaptability to Harsh Working Environment Anti-corrosion coating and reliable sealing, good resistance to coal dust, water mist and high humidity in underground mines.
• Complete Explosion-Proof Documents & Factory Inspection Able to provide full set explosion-proof certificates, factory test reports for customer site acceptance and audit.

4. Wide Application Scope

YWZ4-400/B50 (Explosion-proof) electro-hydraulic drum brake is designed for safety braking of heavy machinery in explosive hazardous areas:

• Underground coal mine belt conveyors, scraper conveyors and hoisting winches
• Flameproof overhead cranes, gantry cranes and rail travelling lifting equipment
• Chemical workshops and production sites with flammable gas and explosive dust
• Mine transfer carts and other explosion-proof industrial transmission machinery
• Retrofit projects replacing old BYWZ series explosion-proof drum brakes

5. Detailed Technical Parameters

6. Working Principle

Energized Release State (Normal Operation)

When the crane, conveyor or hoist is ready to run, the matched B50 explosion-proof thruster is energized. The flameproof motor drives the internal hydraulic pump to build pressure, pushing the piston rod to extend. Through the lever transmission mechanism, the brake spring is compressed and the brake shoes separate from the brake drum. The brake is released and the equipment can operate normally. The flameproof enclosure isolates internal electric sparks continuously.

Power-off Braking State (Emergency & Standby)

When the equipment stops or power supply fails, the B50 thruster loses hydraulic pressure rapidly. Driven by preloaded brake spring, the brake shoes clamp tightly on the brake drum to generate stable friction braking torque and stop equipment rotation. This fail-safe design avoids sliding and runaway risks in gas and dust explosive hazardous zones.

7. Product Customization & After-Sales Service

We supply fully assembled and tested YWZ4-400/B50 explosion-proof electro-hydraulic drum brakes with complete explosion-proof certificates. Custom options include special working voltage, high-temperature resistant friction linings, explosion-proof limit switches, manual release device and heavy anti-corrosion paint. OEM and ODM services are supported.

We can provide 2D/3D drawings, wiring diagrams and English operation manuals for customer approval. Factory direct sales with strict quality inspection. We provide professional technical consultation, installation and commissioning guidance, spare parts supply and long-term global after-sales service for mining, chemical and crane customers.

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