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Introduction of Shipbuilding Gantry Crane
Engineered for the demanding environment of shipyard docks, the Double Parallel Trolley Shipbuilding Gantry Crane (DPT) is a high-capacity lifting solution for handling massive hull sections. YUNTIAN designs and builds these robust cranes with capacities ranging from 50t+50t to 900t+900t. A key operational advantage is the independent or synchronized control of the twin trolleys. The hook spacing between them is easily adjustable during operation, enabling versatile and highly efficient load positioning for complex assembly tasks.
Features of Shipbuilding Gantry Crane
Core Components & Engineering:
a. Heavy-Duty Gantry Frame
The crane's foundation is a resilient gantry structure built with dual box-type main girders, an 'A'-frame flexible leg, and a rigid leg in either an 'A' or 'I' configuration. These primary girders are fabricated from high-strength, low-alloy Q345 steel (yield strength 345 MPa, per GB/T1591-2006), selected for its optimal balance of structural integrity and cost-effectiveness. A critical feature is the spring bearing joint linking the main girder to the flexible leg. This joint, featuring a neoprene bearing pad, allows the girder to expand and contract freely, a design that effectively prevents rail gnawing and ensures smooth, long-term operation.
b. Precision Trolley System
Each trolley is a self-contained unit comprising a welded frame (using Q235 or Q345 steel), a hoisting mechanism, a travel system, and integrated safety devices. To ensure operational boundaries are respected, the trolley is equipped with travel limit switches. Robust buffers are installed at both ends to absorb impact energy and prevent damage in the event of an over-travel collision.
c. Reliable Hoisting Mechanism
Lifting power is delivered by a system engineered for smooth control and safety. It incorporates a frequency-conversion motor, brake, reducer, steel drum, and wire rope assembly. We utilize premium components, including hardened gear reducers and motors from reputable manufacturers. The wire rope, with an 18x7 construction and a 1670 MPa tensile strength, works with pulleys that have a diameter ratio exceeding 20:1 to minimize wear. Critical safety is ensured with built-in overload limiters and overspeed protection switches.
d. Trolley Travel & Drive System
Mobility for each trolley is provided by a system featuring a motor, brake, hollow-shaft reducer, and bogies. The wheel assemblies employ either robust right-angle bearing boxes or modern split-type boxes, the latter designed for easier assembly and maintenance. Wheels are cast from ZG50SiMn steel and feature double rims, a design that provides exceptional strength and resists derailment caused by travel deviation.
e. Gantry Travel & Safety Mechanisms
The entire crane's movement along the dock is managed by a network of bogies and triad reducers. Comprehensive safety is paramount: the system includes rail clamps or anti-wind shoes that interlock with an anemometer to secure the crane during high winds. A rail clearer on the end bogie removes obstructions from the track, while a rectifying wheel corrects any crabbing motion. A lightning arrestor shoe safely directs any electrical strikes to the ground.
Technical Parameters of Shipbuilding Gantry Crane
Packaging & Shipment
Critical components like electrical systems and hoists are secured in reinforced plywood cases for weatherproof transit.
Major structural parts, including the main girder and end beams, are wrapped in protective plastic sheathing to guard against corrosion during sea shipment.
Applications of Shipbuilding Gantry Crane
Our Double Parallel Trolley (DPT) Gantry Crane is engineered to meet the rigorous demands of contemporary shipyards, serving as the backbone for efficient and safe maritime construction. Its unique design, featuring independently operable trolleys, unlocks new levels of precision and workflow optimization.
1. Precision Hull Block Assembly
This crane is fundamental for constructing large vessel segments. It expertly lifts and positions massive prefabricated sections—such as hull blocks, deck modules, and superstructure elements—with exceptional control. The ability to use its twin trolleys separately or in sync allows for the balanced handling of asymmetrical components, streamlining the step-by-step assembly of the ship's main body and drastically cutting down production timelines.
2. Dry Dock Vessel Handling & Maintenance
In dry dock scenarios, the DPT crane is indispensable for critical launch, docking, and repair operations. Its high load capacity is essential for the controlled placement and removal of ships onto dry berths. This provides crews with full, unimpeded access to the vessel's underside for thorough inspection, maintenance, and repair work, all while ensuring the highest standards of safety.
3. Streamlined Material Logistics
Beyond major components, the crane revolutionizes daily material flow. It efficiently manages the loading, unloading, and precise placement of heavy supplies like steel plates, engine parts, and large-bore piping. This capability minimizes reliance on multiple, less efficient equipment, reduces manual labor, and accelerates the entire supply chain within the shipyard.
4. Support for Facility & Crane Upkeep
The crane's utility extends to the maintenance of the shipyard itself. It is capable of lifting and moving other heavy machinery or its own components for servicing and repair. This self-sufficient functionality is crucial for performing scheduled maintenance and urgent fixes, helping to avoid costly operational delays and extend the service life of key assets.
5. Custom Project & Retrofit Flexibility
For custom shipbuilding, conversion, or modernization projects, the crane's adaptable trolley system is a significant advantage. The adjustable hook distance allows it to accommodate non-standard, oversized, or irregularly shaped modules, providing shipbuilders with the flexibility needed to bring innovative and complex vessel designs to life.
