The semi gantry crane, with its unique advantages of relying on the factory structure on one side, having single-side ground support, saving space, and strong adaptability, has become the preferred equipment for various lifting scenarios. Unlike the traditional full gantry crane, the selection of the semi gantry crane is more dependent on the workshop layout, on-site structure, and specific working conditions. Many users only select based on tonnage, which often leads to problems such as insufficient coverage, structural mismatch, installation restrictions, and low cost performance.
SEVENCRANE, as a professional crane manufacturer with rich export experience, has many overseas cases available for customers to refer to. Our engineering team can provide customized lifting solutions for customers to ensure that the purchased semi gantry crane fully meets customer expectations. The design of the semi gantry crane is special, and we provide installation guidance, allowing the customer’s workshop to be put into use quickly.
1.Determine the rated lifting capacity
The first step in selection, accurately determining the rated lifting capacity required by the equipment, is the foundation for ensuring the safe and stable operation of the equipment. When selecting, one cannot simply rely on the average daily lifting weight for judgment; it is necessary to comprehensively review the details of the on-site working conditions.
During communication with customers, we need to focus on confirming the following three issues:
① The maximum weight of the goods to be lifted in a single operation in the workshop
② Whether the maximum load occurs occasionally or is frequently full-load daily
③ Whether the production line upgrade in the future will increase the lifting load and whether a load reserve is needed.
Commonly seen lifting materials in the workshop include steel, machinery equipment, injection molds, engines, heavy workpieces, and work accessories, and the weights of different materials vary greatly.
The principle is that the rated load of the semi gantry crane must match the maximum actual lifting load on site, rather than the average daily lifting load. If selected based on conventional light loads, there will be an overload risk in heavy lifting scenarios. Reserving a reasonable safety margin can adapt to long-term stable production.
2.Verify the effective lifting height
The lifting height directly determines whether the equipment can complete the lifting and lowering of goods, and is also a key parameter that is prone to selection errors. The effective lifting height of the equipment refers to the maximum vertical lifting distance that the hook can achieve, rather than simply determining based on the ceiling height of the workshop.
① Overall net height of the workshop
② The height of the goods to be lifted
③ The height of the production line, equipment, and workbench surfaces that need to be crossed during operation
④ The lowest limit height of the hook and the structural occupation height of the electric hoist itself
The required lifting height should be determined by the actual clearance needed for load handling, not simply by the workshop ceiling height. The lifting height needs to be customized based on the actual requirements of cargo hoisting and crossing obstacles to avoid problems such as inability to complete high-altitude operations after equipment entry and insufficient hoisting space.
3.Reasonable selection of equipment span
The span is the core parameter of the semi-gantry crane, referring to the effective coverage width between the single side leg and the factory wall/track, directly determining the lateral operation coverage range of the equipment.
How to judge when selecting the equipment:
① The overall width of the workshop operation area,
② The arrangement method of production equipment,
③ The conventional placement position of goods,
④ Whether the entire production line operation needs to be fully covered.
Precise span design can perfectly cover the hoisting position and eliminate operation blind areas.
A larger span is not necessarily better. Blindly increasing the equipment span will increase the difficulty of equipment structure design, increase the overall weight and production cost, and also occupy extra workshop space, affecting workshop passage and equipment placement. A reasonable span design can control the equipment size and cost, achieving the maximum cost-effectiveness.
4.Selecting based on workshop layout
Compared with the general semi-gantry crane selection guide, the adaptability to workshop layout is the key point for semi-gantry crane selection. It can be adapted to most small and medium-sized workshops. Adopting a special structure of “single side relying on the original factory steel structure/wall track, single side landing leg support”, it perfectly adapts to restricted workshop conditions.
Traditional full-gantry cranes require double-sided landing support, occupying a large space and having high requirements for the site, and are not suitable for compact workshops. While the semi-gantry crane design can fully utilize the existing factory structure of the workshop, no large-scale site renovation is required. This structural design reduces installation costs, saves space, and is the optimal choice for optimizing and upgrading the workshop.
5.Planning operation travel and overall operation range
After determining the basic parameters of the equipment, it is necessary to plan the overall operation travel and coverage area of the crane to ensure that the equipment can adapt to full-position operations. Our engineers need to focus on confirming: the effective operation distance of the crane, the length of the track laying, and the range of the core operation area.
For single fixed positions and small-scale hoisting operations, short tracks can be used to meet the requirements of fixed-point lifting; for multi-position dispersed operations, cross-area material transfer and crossing equipment obstacles operations, the length of the track can be increased to expand the equipment operation range and achieve full-position coverage hoisting.
6.Selecting appropriate hoists and control methods
The hoist and control method directly determine the operation experience of the equipment, hoisting accuracy and operation efficiency. They need to be selected based on specific requirements.
In hoist selection, for the conventional light and medium-sized hoisting scenarios in the workshop, electric chain hoists are preferred, as they are small in body, stable in operation, and have high cost-effectiveness; for heavy and high-precision hoisting conditions, electric wire rope hoists can be selected, with stronger load-bearing performance and more stable operation.
In control methods, for ordinary workshop hoisting operations, the mainstream combination is hand-held wired control and wireless remote control, suitable for the majority of hoisting projects. The core basis for selection is the equipment load capacity, daily usage frequency, hoisting accuracy requirements, operation distance and on-site working environment, so that the configuration of the working conditions can be adapted to efficiency and safety.
7.Considering usage frequency and operation environment
Usage frequency and operation environment are the key factors determining the service life and stability performance of the equipment, directly affecting the selection of the working level of the semi-gantry crane.
According to usage frequency, it can be divided into three types of working conditions:
① Light-duty conditions are occasional hoisting and intermittent operations, mostly used for equipment irregular maintenance;
② Medium-duty conditions are daily several hours of regular hoisting, suitable for regular production line operations;
③ Heavy-duty conditions are 24-hour high-frequency continuous operations, suitable for high-intensity production requirements of the assembly line.
We can match the corresponding equipment working level according to the operation frequency to avoid equipment failure caused by frequent use of low-quality equipment.
At the same time, the operation environment needs to be thoroughly checked: distinguish between indoor and outdoor conditions, take into account the on-site temperature, dust, humidity, as well as whether there are special conditions such as corrosion, flammability, and explosiveness. For workshops with large amounts of dust, high humidity, and corrosiveness, special renovations for anti-corrosion, dust-proof, and waterproof measures can be carried out to ensure the long-term stable operation of the equipment.
8.Verification of Installation Conditions and Safety Standards
After all parameter selections are completed, the final step is to comprehensively check the on-site installation conditions and safety standards to ensure that the equipment can be installed smoothly and used in compliance.
Particular attention should be paid to the special installation points of semi-gantry cranes. When the equipment runs on one side relying on the original structure of the factory building, before the selection, precise detection of the bearing capacity of the factory building’s steel beams and wall tracks must be carried out to ensure that the original structure can withstand the dynamic loads during the equipment operation. On the premise of meeting all installation conditions and safety standards, the customized semi-gantry crane can truly be adapted to the workshop.
Need help selecting the right semi gantry crane? Send us your lifting capacity, span, lifting height and working conditions.
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