In modern industrial logistics and heavy‑duty manufacturing, the double girder box‑type semi gantry crane, with its box‑type double‑girder structure and single‑leg semi‑gantry layout, serves as an ideal piece of equipment balancing heavy‑load lifting and space utilization. It is widely applied in mechanical processing, warehousing & logistics, metallurgy & building materials, port handling and other sectors.
I. Core Structure of Double Girder Box‑type Semi Gantry Crane: Robust and Flexible for Versatile Adaptation
The equipment adopts closed box‑type double girders welded from high‑strength low‑alloy steel plates, delivering outstanding torsional and bending resistance to effectively prevent deformation under heavy loads. The parallel‑arranged double girders ensure even load distribution, enabling precise positioning with minimal sway when lifting large‑tonnage materials.
Its semi‑gantry frame is supported by existing workshop rails at one end and ground legs at the other, eliminating the need for ground supports on both sides. This not only cuts civil engineering and foundation renovation costs, but also perfectly suits indoor‑outdoor integrated operations, allowing one unit to cover multiple working scenarios.
II. Core Advantages of Double Girder Box‑type Semi Gantry Crane: Heavy‑duty, Efficient, Economical and Safe
Heavy‑duty & Efficient: Rated lifting capacity ranges from 5 t to 50 t with a span of 8‑30 m. Equipped with a variable‑frequency speed‑regulation system, it delivers smooth hoisting and travelling without impact, realizing both fast material handling and precise alignment, and boosting working efficiency by over 30%.
Economical & Flexible: Installation leverages existing workshop structures to greatly shorten construction periods. The single‑side ground rail occupies no extra space and does not hinder vehicle movement inside workshops, bringing lower energy consumption and maintenance costs over long‑term operation.
Safe & Reliable: Standard safety configurations include overload limiters, travel limit switches and emergency power‑off devices. Optional accessories such as wind anchoring and anti‑collision warning systems are available. Box‑type main girders undergo strict flaw detection, and support legs feature excellent wind and seismic resistance for complex indoor and outdoor environments.
Convenient Operation: Three control modes are available: operator cabin, wired pendant and wireless remote control. PLC programmable control and variable‑frequency drive guarantee smooth startup and accurate speed adjustment, reducing material swinging and potential safety risks.
III. Application Scenarios of Double Girder Box‑type Semi Gantry Crane: Multi‑industry Coverage to Solve Lifting Challenges
Machinery Manufacturing: High‑precision lifting and handling for machine tool beds, heavy components and complete‑machine assembly.
Warehousing & Logistics: Connect indoor warehouses and outdoor yards for efficient transfer of large‑size goods and containers.
Metallurgy & Building Materials: Dust‑resistant and high‑temperature‑tolerant performance for lifting heavy‑load materials such as steel billets and stone blocks.
Ports & Railways: Compact handling equipment for short‑distance lifting operations in open‑air sites.
Automobile & Wind‑power Industries: Transfer of large‑size components and heavy‑duty equipment to ensure smooth production workflows.
IV. Selection and Maintenance Guidelines for Double Girder Box‑type Semi Gantry Crane
Selection Key Points
Reserve a 10%‑20% safety margin for the rated lifting capacity. Determine span and lifting height according to site conditions and workshop structures. Select A5‑A6 working class for conventional heavy‑duty applications; upgrade configurations for high‑frequency operations. Add wind‑proof and anti‑corrosion treatments for outdoor deployment.
Maintenance Recommendations
Regularly inspect main girder welds and support‑leg bolts to guard against structural fatigue. Clean rails and lubricate transmission components on a monthly basis. Replace steel wire ropes and hooks once they reach wear‑out criteria. Keep electrical control cabinets clean and dry to avoid circuit faults.
Featuring stable heavy‑load performance, flexible space adaptability and high cost‑efficiency, the double girder box‑type semi gantry crane fully empowers enterprises in material handling operations. Specialized in R&D and manufacturing of lifting equipment, our company provides one‑stop solutions including customized design, production, installation and maintenance based on customers’ site conditions, working conditions and load requirements. Professional technologies safeguard your production.
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