In industrial settings where flammable gases, vapors, or dust particles pose constant explosion risks—such as petrochemical plants, oil refineries, coal mines, pharmaceutical facilities, and chemical processing plants—safety and reliability are non-negotiable. The Double Girder Crane with Explosion-proof Hoist is engineered to meet these extreme challenges, combining the robust load-bearing capacity of a double girder structure with the precision safety of an explosion-proof hoist system. This specialized lifting solution delivers unparalleled performance, durability, and peace of mind for operations where even the smallest safety lapse can lead to catastrophic consequences.
Core Design & Construction: Built for Hazardous Excellence
At its core, this crane system is a fusion of two heavy-duty, explosion-proof-engineered components: a double girder overhead crane and a custom explosion-proof electric hoist, designed to adhere to the strictest international safety standards (including ATEX, IECEx, and NFPA 499). Every part of the system is constructed to prevent ignition of flammable atmospheres, making it ideal for Class I, Division 1/2 and Class II, Division 1/2 hazardous locations as defined by the U.S. OSHA and global regulatory bodies.
1. Double Girder Crane Main Structure
The double girder framework forms the stable backbone of the crane, offering significant advantages over single-girder models in terms of load capacity, span range, and operational stability:
- ◆ High-Strength Steel Girders: Fabricated from premium-grade low-alloy structural steel, the main girders are precision welded and stress-relieved to ensure maximum rigidity and load-bearing strength. They support heavy loads without deflection, even at maximum span lengths (up to 31.5 meters), making the crane suitable for large industrial facilities.
- ◆ End Carriages & Travel Mechanism: The crane travels on a runway beam via heavy-duty end carriages equipped with explosion-proof drive motors and wheels. The travel mechanism is engineered for smooth, vibration-free movement, with anti-derailment devices and limit switches to prevent over-travel. Gearboxes are sealed and lubricated for long-term reliability in dusty, corrosive hazardous environments.
- ◆ Bridge Frame & Lifting Mechanism: The bridge frame connects the girders and end carriages, with a trolley traversing the length of the girders to position the hoist horizontally. The trolley’s movement is driven by an explosion-proof motor and worm gear reducer, ensuring precise positioning even under full load.
2. Explosion-proof Hoist: The Heart of Safety
The explosion-proof hoist is the critical component that differentiates this crane from standard lifting equipment. It is fully certified for explosive atmospheres, with every design element eliminating potential ignition sources:
- ◆ Explosion-Proof Motors & Controls: The hoist’s lifting and traversing motors, along with all electrical controls (contactors, relays, limit switches), are housed in explosion-proof enclosures. These enclosures contain any internal sparks or arcs and prevent them from igniting flammable gases/vapors in the surrounding environment. The insulation class of the motors is upgraded to F/H for enhanced heat resistance and safety.
- ◆ Overload & Safety Protection: Equipped with dual overload protection (mechanical and electrical), the hoist automatically stops lifting when the load exceeds the rated capacity to prevent structural failure. Additional safety features include upper/lower limit switches, anti-sway technology to minimize load swing, and emergency stop buttons for instant shutdown in emergencies.
- ◆ High-Strength Lifting Components: The hoist uses a heavy-duty steel wire rope (or chain, for chain hoist models) with a safety factor of 5:1, meeting or exceeding industry standards. The drum is precision machined to ensure uniform rope winding, preventing rope entanglement and wear. For extreme environments, the rope can be galvanized or stainless steel to resist corrosion.
Double Girder Crane with Explosion-proof Hoist Key Technical Parameters
| Parameter |
Specification Range |
|---|
| Rated Load Capacity |
1t – 32t (customizable for specialized loads) |
| Span Length |
7.5m – 31.5m (adaptable to diverse workshop layouts) |
| Lifting Height |
6m – 18m (flexible for varied overhead lifting requirements) |
| Working Class |
A3, A4, A5 (suited for different operational frequency and intensity needs) |
| Lifting Speed |
0.8 – 8 m/min (variable frequency adjustable) |
| Traveling Speed (Crane/Trolley) |
20 – 60 m/min (variable frequency adjustable) |
| Hazardous Location Rating |
Class I, Div 1/2; Class II, Div 1/2; ATEX II 2G / II 2D |
| Power Supply |
3-phase AC 380V/50Hz (customizable for 440V/60Hz) |
Unmatched Advantages for Hazardous Operations
- 1. Ultimate Safety Compliance: Fully meets global explosion-proof and safety standards, ensuring full compliance with regulatory requirements for hazardous industrial environments and eliminating the risk of explosion-related accidents.
- 2. Superior Load Performance: The double girder structure, paired with a 1-32 ton load capacity range, delivers stable and efficient handling of both medium and heavy loads. Its robust design outperforms single-girder cranes in longevity and load-bearing stability, supporting frequent lifting operations across different weight tiers.
- 3. Precision & Efficiency: Variable frequency drive (VFD) technology enables smooth speed control and precise positioning of the load, reducing material damage and improving operational efficiency—critical for industries with high-value or fragile cargo. The 7.5-31.5m span and 6-18m lifting height further expand operational flexibility, covering large-scale facility layouts and diverse lifting height demands.
- 4. Durability & Low Maintenance: All components are constructed with corrosion-resistant materials and explosion-proof seals to withstand harsh conditions (dust, moisture, corrosive gases). The system’s modular design simplifies maintenance and reduces downtime, while the A3-A5 working class ratings ensure adaptability to varying operational frequencies, from light to moderate intensity use.
- 5. Customization Flexibility: Tailored to meet specific site requirements, including custom span adjustments, lifting height optimization, hoist types (wire rope/chain), and explosion-proof ratings. Optional features include radio remote control, explosion-proof lighting, and collision avoidance systems.
Application Scenarios: Trusted by Industries Worldwide
The Double Girder Crane with Explosion-proof Hoist is the go-to lifting solution for a wide range of high-risk industries:
- ◆ Petrochemical & Oil & Gas: Lifting and moving pipes, valves, chemical equipment, and crude oil storage tank components in refineries and offshore platforms.
- ◆ Mining & Quarrying: Handling explosives, coal, and mineral ores in underground mines and open-pit mining operations (Class II, Division 1/2 environments).
- ◆ Pharmaceutical & Chemical Processing: Lifting raw materials, finished products, and equipment in facilities handling flammable solvents, powders, or gases.
- ◆ Power Generation: Nuclear and thermal power plants (for fuel handling and equipment maintenance in hazardous gas/dust zones).
- ◆ Paint & Coatings & Explosives Manufacturing: Safe lifting of flammable liquids, coatings, and explosive materials during production and storage.
Why Choose Our Double Girder Explosion-proof Crane?
At Weihua, we specialize in designing, manufacturing, and installing custom lifting solutions for hazardous environments. Our Double Girder Crane with Explosion-proof Hoist is built with decades of engineering expertise and field-tested in the most demanding industrial settings. We offer end-to-end services—from initial site assessment and custom design to manufacturing, installation, commissioning, and after-sales support—ensuring that your operation has a lifting solution that is safe, reliable, and cost-effective.
Safety is the foundation of every lift. Invest in a crane that is engineered to protect your personnel, assets, and operations. Contact our technical team today to discuss your specific requirements and get a customized solution quote.
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