Double girder overhead cranes equipped with dual trolleys are designed for industrial settings that demand high-capacity lifting, precision, and multitasking capabilities. These cranes incorporate two parallel girders to support two independently operated trolleys, enabling simultaneous handling of multiple loads or complex material positioning. Common in industries such as steel production, automotive manufacturing, and logistics, this configuration enhances operational efficiency by minimizing downtime and maximizing workspace utilization.

The dual trolley system allows one trolley to handle primary lifting tasks while the second manages auxiliary operations, such as rotating loads or placing components with millimeter-level accuracy. This flexibility is critical in environments like foundries, where molten metal must be transported swiftly, or assembly lines requiring synchronized part placement.

Key Features and Technical Specifications

Structural Design and Load Capacity

  • Girder Construction: Fabricated from high-grade steel (Q235B or Q345B), the girders undergo finite element analysis (FEA) to ensure optimal strength-to-weight ratios. The double girder design provides superior rigidity compared to single girder systems, reducing deflection under heavy loads.

  • Load Capacity: Standard models range from 5 to 550 tons, with custom builds available for specialized applications, such as nuclear component handling or shipbuilding.

  • Span and Lifting Height: Adjustable spans of 10–35 meters cater to facility layouts, while lifting heights up to 30 meters accommodate multi-level workshops or high-bay storage.

Dual Trolley System

  • Primary Trolley: Engineered for heavy lifting, with hoisting speeds adjustable between 0.5–15 m/min. Equipped with drum or disc brakes to ensure controlled load handling.

  • Auxiliary Trolley: Operates at slower speeds (0.1–5 m/min) for precision tasks, such as aligning machinery components or placing fragile materials.

  • Synchronization: Both trolleys can be operated in tandem for handling oversized loads, such as wind turbine blades or industrial boilers.

Control and Power Systems

  • Control Options: Choose from pendant controls, radio remote systems, or ergonomic operator cabins with touchscreen interfaces. Variable frequency drives (VFDs) ensure smooth acceleration and deceleration, reducing mechanical stress on components.

  • Power Supply: Insulated conductor bars or festoon systems deliver uninterrupted power, compliant with IEC 60204-32 safety standards.

double-trolley-bridge-crane

Industrial Applications of Double Trolley Cranes

Steel and Metal Processing

  • Foundries: Transport molten metal in ladles with heat-resistant trolley systems.

  • Rolling Mills: Handle steel coils weighing up to 300 tons using reinforced hooks and anti-sway technology.

  • Fabrication Shops: Position large structural beams during welding or machining processes.

Power Generation and Heavy Machinery

  • Turbine Installation: Lift and align gas or steam turbines weighing 200+ tons in power plants.

  • Generator Maintenance: Use auxiliary trolleys to remove rotor components for servicing.

Logistics and Warehousing

  • Container Handling: Load/unload shipping containers in ports or intermodal yards.

  • High-Bay Storage: Organize palletized goods in warehouses with heights exceeding 25 meters.

Automotive and Aerospace Manufacturing

  • Assembly Lines: Install engines or fuselage sections using precision-guided trolleys.

  • Stamping Presses: Transfer stamped metal sheets between presses without manual intervention.

Advantages of a Double Trolley Configuration

Operational Efficiency

  • Parallel Task Execution: Perform lifting and positioning simultaneously, reducing cycle times by up to 40% in repetitive workflows.

  • Reduced Downtime: Eliminate the need to reconfigure trolleys between tasks, ensuring continuous operation.

Space and Cost Savings

  • Single Crane Solution: Replace multiple single-trolley cranes with one dual-trolley system, optimizing floor space.

  • Lower Energy Consumption: Efficient motor designs and regenerative braking systems cut power usage by 15–20% compared to traditional models.

Versatility in Load Handling

  • Mixed Load Sizes: Manage diverse loads, from small machinery parts to heavy industrial equipment, in a single workflow.

  • Tandem Lifting: Distribute weight across both trolleys for oversized items, minimizing strain on individual components.

Safety Mechanisms and Compliance

Structural Safety

  • Design Standards: Compliance with ISO 8686-1 for load calculations and FEM 1.001 for structural integrity.

  • Material Testing: All steel components undergo ultrasonic testing to detect internal flaws, ensuring a minimum safety factor of 1.5:1.

Operational Safety

  • Redundant Braking Systems: Dual mechanical and electromagnetic brakes prevent accidental load drops.

  • Collision Avoidance: Laser sensors and RFID tags detect obstacles, automatically halting trolley movement.

  • Overload Protection: Load cells and limit switches disable operations if weight exceeds rated capacity.

Certifications

  • Global Compliance: CE marking for EU markets, and GB/T for China.

  • Electrical Safety: IEC 61496 certification for machinery safety and IP55-rated components for dust/water resistance.

Customization for Specific Environments

Environmental Adaptations

  • High-Temperature Resistance: Ceramic-coated wires and heat shields protect components in foundries (up to 180°C).

  • Corrosion Protection: Epoxy-painted surfaces or stainless steel trolleys for coastal or chemical plants.

Specialized Components

  • Explosion-Proof Motors: ATEX/IECEx-certified motors for hazardous environments like oil refineries.

  • Anti-Sway Technology: AI-based algorithms stabilize loads during high-speed transfers.

Automation Integration

  • PLC Compatibility: Sync with programmable logic controllers for automated workflows.

  • IoT Connectivity: Monitor crane performance in real-time via cloud-based platforms.

Maintenance and Support Services

Preventive Maintenance

  • Inspection Intervals: Quarterly checks for wire rope wear, gearbox lubrication, and electrical connections.

  • Lubrication Plans: Automated greasing systems for trolley wheels and bearings to extend component life.

Spare Parts and Repairs

  • Global Inventory: Stocked components include brake linings, motor windings, and control panels.

  • Emergency Services: On-site technicians available within 48 hours for critical repairs.

Training Programs

  • Operator Certification: Hands-on training for load balancing, emergency protocols, and control systems.

  • Maintenance Workshops: Annual sessions for in-house teams to conduct routine inspections.

Why Partner With Yuantaicrane?

Technical Expertise

  • 18 Years of Experience: 1,200+ installations in industries ranging from automotive to energy.

  • R&D Investment: Continuous innovation in automation and energy-efficient designs.

Quality Assurance

  • ISO 9001 Certification: Rigorous quality checks at every production stage.

  • 3-Year Warranty: Coverage for mechanical components, including gears and motors.

Customer Support

  • Turnkey Solutions: Site surveys, installation, and commissioning handled by certified engineers.

  • 24/7 Assistance: Remote diagnostics via IoT sensors to preemptively address issues.

Frequently Asked Questions

Q: How does the dual trolley system improve productivity?
A: By allowing simultaneous lifting and positioning, operators reduce idle time between tasks. For example, in steel mills, one trolley can transport molten metal while the other positions molds.

Q: Are these cranes suitable for outdoor use?
A: Yes. Weatherproof components, such as galvanized trolleys and sealed electrical systems, ensure reliable performance in outdoor yards or semi-open facilities.

Q: What is the lifespan of a Yuantaicrane double girder crane?
A: With proper maintenance, the crane operates efficiently for 25–30 years. Regular inspections and lubrication are critical to longevity.

Get your Customized Price!

Double girder overhead cranes with double trolleys are indispensable for industries requiring robust, high-precision material handling. Yuantaicrane combines technical expertise, compliance with global standards, and customizable solutions to meet diverse operational needs. For detailed specifications or a tailored quote, visit yuantaicrane.com or contact us.

Why Choose Yuantai Crane?

Give you multiple returns

Yuantai's crane products have currently served more than 150 countries around the world, and have created wealth for customers that is several times the price of the crane machine, and it is still going on.

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Professional and customized crane solutions can better match customers' working conditions. High-quality crane products make customers more assured and worry-free when use.

Product life cycle service

Our services run through all aspects of product design, production, installation and spare parts support. Taking customers as the center and taking high-quality products as the core carrier, realize the service concept of customers buying with confidence and using them with confidence.

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