31-Dec-2025
30 Ton Double Girder Bridge Crane with Double Trolley
Designed for Unmatched Efficiency in Heavy-Duty Manufacturing
Dongqi Crane’s 30 Ton Double Girder Bridge Crane with Double Trolley is engineered for manufacturing plants where maximizing productivity, optimizing floor space, and handling complex lifting sequences are critical. This robust solution combines superior double girder strength with the operational flexibility of two independent trolleys to tackle your most demanding material handling challenges.
Key Advantages at a Glance: A Paradigm Shift in Efficiency
The Dongqi 30/5 Ton Double Girder Crane with Double Trolley is not merely an upgrade; it redefines material handling dynamics. By integrating two independently controlled trolleys on a single, robust bridge, it solves the fundamental limitations of traditional single-trolley cranes. The table below contrasts common challenges with our engineered solutions and the tangible benefits you gain.
| Challenge with Single-Trolley Cranes | Dongqi’s Double Trolley Solution | Direct Benefit to Your Plant |
|---|---|---|
| Bottlenecks & Idle Time: A single trolley creates wait times—completing one task before moving to the next. | Parallel Processing: Two trolleys operate independently. One can load raw materials while the other positions components on the assembly line. | Boosts Productivity by 40-60% by drastically reducing non-productive travel and wait cycles. |
| Inefficient Space Utilization: A single trolley covers the entire span but can only be in one place at a time. | Full-Span Coverage: Trolleys can service opposite ends of the bay simultaneously, effectively maximizing the utility of the entire workshop area. | Optimizes Floor Space ROI by transforming the crane from a linear tool into an area-wide handling system. |
| Limited Process Flexibility: Handling complex sequences (e.g., lifting a long beam at two points) requires cumbersome, manual coordination. | Synchronized & Independent Modes: Trolleys can be synchronized to lift a single long or heavy load with perfect balance, or work entirely separately. | Enables Complex Operations like handling girders, large molds, or machinery with precision and inherent safety. |
| High-Cost Workarounds: To achieve parallel workflows, plants often install two separate cranes or use mobile equipment. | All-in-One System: One crane structure provides the capabilities of two, with a significantly lower total cost of ownership. | Reduces Capital & Operational Expenses—one crane, one set of rails, one control system, yet dual functionality. |
In essence, this system transitions your lifting operations from sequential to parallel. It delivers the flexibility of a fleet with the simplicity and cost-effectiveness of a single, intelligently engineered machine, directly enhancing throughput and operational agility.
Technical Specifications: Engineered for Reliability
The crane is built to international standards, offering a wide range of customizable parameters to fit your exact workshop layout and duty cycle requirements. Key specifications are summarized below.
Model: QE Type Double Trolley Double Girder Overhead Crane
| Parameter | Standard Specification | Notes / Customization Options |
|---|---|---|
| Lifting Capacity | 30 Tons (per trolley) | Total system capacity can be configured based on tandem lift requirements. |
| Span (S) | 10.5m – 35.5m | Can be customized to fit your specific bay width. Standard range often up to 31.5m. |
| Lifting Height (H) | Up to 30m | Designed based on your facility’s clear height and process needs. |
| Work Duty / Class | A5, A6 (ISO/FEM) | Suitable for Medium to Heavy Service (equivalent to FEM 2m-3m, CMAA Class C-D). Ideal for frequent use in machine shops, fabrication, and assembly lines. |
| Control Mode | Cabin Control / Pendant / Radio Remote | Options include advanced Variable Frequency Drive (VFD) control on all motions (Bridge, Trolley, Hoist) for supremely smooth and precise positioning. |
| Ambient Temperature | -20°C to +40°C | |
| Power Supply | 3 Phase, 50/60 Hz, 220V-690V | Configured to match your local plant power system. |
| Key Safety & Control Features | – Overload Limit Device – Anti-Collision System between Trolleys – Limit Switches for all motions – Emergency Stop – Insulated or special safety packages available for hazardous environments (e.g., explosion-proof). |
Ideal Applications in Manufacturing: Targeted Solutions for Complex Operations
The Dongqi 30/5 Ton Double Girder Crane with Double Trolley excels in environments where material handling is not just about lifting, but about orchestrating complex, high-value workflows. Its design directly addresses specific, costly challenges across key heavy industries.
1. Automotive & Aerospace Manufacturing: Precision in High-Volume Assembly
In these sectors, efficiency and precision in handling large, expensive components are critical.
- Core Challenge: Managing the rapid changeover of massive stamping dies (often 20-30 tons) and the precise positioning of body-in-white assemblies or large composite aerospace structures without creating bottlenecks.
- How Our Crane Solves It:
- Parallel Process Flow: One trolley can be dedicated to staging and changing dies in a press line, while the second simultaneously services the assembly line, delivering sub-assemblies or tools. This parallel operation eliminates the traditional downtime where a single crane must complete all tasks sequentially.
- Tandem for Delicate Loads: For handling large, unwieldy aerospace panels or vehicle frames, both trolleys synchronize to provide a stable, two-point lift. This prevents structural flexing and allows for millimeter-precise rotation and placement by skilled cabin operators, which is crucial for fit-up in automated welding or bonding stations.
2. Heavy Equipment & Machinery Fabrication: Streamlining Large-Scale Assembly
This involves moving heavy weldments, large machine bases, and assembled components through various stations.
- Core Challenge: The sequential nature of fabrication—from cutting to welding, machining, and final assembly—often requires multiple handling steps for a single large piece, creating logjams.
- How Our Crane Solves It:
- Work-in-Progress Orchestration: The dual trolleys act as independent material handlers within one bay. For example, while the main trolley (30T) positions a large excavator boom on a welding positioner, the auxiliary trolley (5T) can deliver weld wire, tools, or smaller brackets to the same workstation, keeping the welder productive.
- Final Assembly Aid: During the mating of large sub-assemblies (e.g., installing a cab onto a tractor chassis), one trolley can hold the cab in a suspended “ready” position, while the other makes fine adjustments to the chassis alignment, enabling faster and safer final assembly compared to using two separate cranes.
3. Steel Service Centers & Fabrication Shops: Optimizing Long-Load Handling
Handling long, heavy structural steel (I-beams, tubing, plate) efficiently and safely is the primary operation.
- Core Challenge: Single-hook cranes struggle with long loads, causing them to swing and sag dangerously. Traditional solutions like spreader beams are cumbersome and slow down operations.
- How Our Crane Solves It:
- Dedicated Tandem Lifting: The dual trolleys are the ideal, integrated solution. They can be spaced along the bridge to directly pick up a 20-meter steel beam at its optimal balance points. The synchronized control system ensures both trolleys move as one, transporting the beam smoothly from storage, through processing lines (e.g., sawing, drilling), and to the shipping area without the need to attach/detach any additional lifting attachments.
- Uninterrupted Material Flow: One trolley can be loading the saw while the other is unloading finished pieces, creating a continuous flow that maximizes the throughput of expensive processing machinery.
4. Power Generation & Large Component Assembly
This includes the assembly of wind turbine components, hydroelectric equipment, and large generators.
- Core Challenge: Assembling massive components in a constrained space requires extreme precision and the ability to “hover” and adjust large parts during the fitting process.
- How Our Crane Solves It:
- Controlled Mega-Lift Assembly: For placing a generator stator or a wind turbine gearbox, the dual trolleys in synchronized mode provide unmatched control. Operators can make micro-adjustments in multiple axes, allowing for the careful guiding of components onto mounting bolts or precise alignment shafts.
- Tooling and Personnel Support: While the main load is held in place, the second trolley can lift and position work platforms for installation crews or bring in the next large component, significantly reducing the total “crane-occupied” time for the assembly task.
In summary, this crane transforms from a simple lifting tool into the central logistics hub of your production bay. It is uniquely suited for any application where process parallelization, handling of long/awkward loads, or complex multi-step assembly are key to profitability and safety.
Why Choose Dongqi Crane?
- Proven Expertise: With decades of experience, we provide end-to-end solutions from engineering to commissioning.
- Global Standards: Our cranes are designed and manufactured considering international standards like ISO, FEM, and CE certification requirements.
- Full Customization: Every crane is tailored based on your detailed workshop drawings, process flow, and specific operational needs.
- Quality Components: We use reputable branded components for critical parts like motors, drives, and electrical systems to ensure longevity and reliability.
- Comprehensive Support: We offer global after-sales service, technical support, and supply of spare parts.
Ready to Optimize Your Material Handling?
Contact our engineering team today for a free consultation and a customized quotation. Provide your workshop layout and lifting requirements to get started.
📧 Email: sales010@cranesdq.com
🌐 Website: https://sg.craneyt.com/
