Explosion Proof Mining Winch For Coal Mines
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Explosion Proof Mining Winch For Coal Mines
Underground: High‑gas and coal dust explosion hazard areas in coal mines. Requires Exd I Mb / Exib explosion‑proof rating. Works in -20°C to 40°C, 95% humidity.
Surface: Used for hauling and dispatching in open‑pit coal mines. Needs dustproof, rainproof, and corrosion‑resistant design.
Application Scenarios & Working Conditions
Designed specifically for coal mines with high gas and high dust – a key safety device for underground work.
Operating environment
Underground: High‑gas and coal dust explosion hazard areas in coal mines. Requires Exd I Mb / Exib explosion‑proof rating. Works in -20°C to 40°C, 95% humidity.
Surface: Used for hauling and dispatching in open‑pit coal mines. Needs dustproof, rainproof, and corrosion‑resistant design.
Mine types
Coal mines: Built for underground / open‑pit coal mining – meets safety requirements in gas explosion hazardous areas.
Metal mines: Can be used in high‑dust, humid metal mines. Wear‑resistant and corrosion‑proof parts can be added depending on the mine's specific conditions.
Typical jobs
Hauling: Towing equipment and materials in underground tunnels, pulling props at the working face, moving heavy machinery at surface mines.
Hoisting: Lifting coal, rock, personnel, and roof supports in vertical or inclined shafts.
Transport: Long‑distance material transfer with rail systems – e.g., cross‑entry transport underground, horizontal hauling at surface mines.
Mounting spots
Underground: Usually installed at the pit bottom, tunnel entrances, winch chambers, or near the working face – must be away from gas accumulation points.
Surface: Placed near the shaft top, crusher stations, or material transfer yards – fixed on concrete foundations.
Structure & Key Components
Modular flameproof design – all key parts have explosion‑proof certification.
Component Description
- Flameproof drum unit Wraps and stores wire rope; carries and transmits lifting load. High‑strength steel structure, hard‑faced with wear‑resistant alloy.
- Explosion‑proof drive system Flameproof motor + planetary reducer – provides power with VFD speed control.
- Flameproof brake system Flameproof hydraulic disc brake – emergency braking, parking, and deceleration control.
- Explosion‑proof control system Flameproof PLC cabinet – integrates overload protection, travel monitoring, fault warning.
- Flameproof auxiliary devices Flameproof depth indicator, overwind protection, lubrication system, rope guide.
How It Works & Operating Logic
Motor drive
Uses flameproof asynchronous motor or VFD motor – meets coal mine gas explosion hazard requirements.
Motor connects to reducer via flameproof coupling for power transmission.
Reduction & braking
Reduction: Planetary gearbox lowers speed, increases torque – transmission efficiency ≥90%.
Braking: Hydraulic brake for normal stops. In an emergency, a two‑stage brake activates – deceleration ≤5 m/s² – stops safely.
Load control
Real‑time monitoring of rope tension and load. PLC automatically adjusts motor power.
Works with flameproof depth indicator for precise travel control – prevents overwind and overrun.
Key Technical Specs
|
Parameter |
Typical Range |
Notes |
|
Rated Load |
5–500 kN (0.5–50 t) |
Classified by mining explosion-proof grade; heavy-duty models exceed 100 t |
|
Rope Speed |
0.5–10 m/s |
Variable Frequency Drive (VFD) enables stepless adjustment from 0.1–12 m/s |
|
Drum Capacity |
50–1000 m of rope |
Customized according to shaft depth; supports single-layer or multi-layer winding |
|
Motor Power |
5.5–500 kW |
Configured according to load and speed; flameproof motors require Exd I Mb certification |
|
Power Supply |
380V / 660V / 1140V |
Underground coal mines commonly use 660V or 1140V flameproof power supply |
|
Working Slope |
0° (horizontal) to 45° (inclined shaft) |
Anti-slip protection devices are required for steep-slope applications |
Safety & Mining Compliance
Flameproof mining winches must strictly follow coal mine safety standards.
Explosion‑proof design:
Meets GB 3836.1‑2010 Explosive atmospheres – Part 1: Equipment – General requirements. Has Exd I Mb (flameproof) or Exib (intrinsically safe) certification.
01
Emergency braking:
Two‑stage brake – automatically activates on power loss. Braking distance ≤0.5 m.
02
Overload protection:
Built‑in load sensor – stops and alarms when load exceeds 110% of rated.
03
Applicable standards:
MT/T 771‑2011 Technical conditions for mine hoisting winches, GB/T 20961‑2007 Single‑rope winding mine hoists, and other industry standards.
04
Materials, Durability & IP Rating
High‑strength steel structure: Drum forged from Q345B or 45# steel. Frame welded from thick steel plates – tensile strength ≥600 MPa.
Wear parts: Drum surface hard‑faced with wear‑resistant alloy. Wire rope galvanized or plastic‑coated. Brake shoes use high‑friction wear‑resistant material.
Industrial rating: IP54 – works in -20°C to 40°C, 95% humidity underground. Certified with national mining safety label (MA).
Installation, Operation & Maintenance
Installation requirements
Must be bolted to a concrete foundation with adequate strength – levelness error ≤0.1‰.
Underground installation must leave room for ventilation and maintenance, interface with gas monitoring, and be located away from gas accumulation points.
Operation features
Flameproof visual control panel with start/stop, speed control, and emergency brake buttons – supports local / remote control.
HMI shows lifting height, load, speed, etc. Automatic fault diagnosis with alerts.
Routine maintenance
Daily: Check brake shoe wear, rope tension, and lubrication.
Weekly: Measure temperature and vibration of reducer and motor.
Monthly: Calibrate depth indicator and overload protection. Full disassembly and inspection every six months.
Customization & Selection Support
Load rating:
Custom from 5 kN to 500 kN (0.5–50 t) as needed.
Rope length:
From 50 m to 1000 m – adapts to different shaft depths.
Control options:
Standard PLC, VFD speed control, remote monitoring system, etc.
Voltage options:
380V, 660V, 1140V – fits different power supplies.
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