Lifting Capacity of STS Gantry Crane

1. Structural factors

Girder and gantry: The girder and gantry of the STS Gantry Crane are the main load-bearing structures. The material of the girder (such as the strength grade of the steel) and the structural dimensions determine the bending moment it can withstand. Longer and thinner girders are prone to deformation when lifting heavy objects, and the lifting capacity will be limited. The structural form and size of the gantry affect the stability and load-bearing capacity. The A-type gantry can better distribute the weight through a reasonable tilt angle, and the thick gantry structure can withstand greater pressure, which helps to improve the lifting capacity.

Hoisting mechanism: The size of the drum in the hoisting mechanism is very important. The diameter of the drum affects the bending stress of the wire rope. A large diameter drum can reduce the bending stress and make the lifting safer. The material and manufacturing process of the drum determine the torque it can withstand. At the same time, the strength of the wire rope, including its breaking tension and specifications, limits the lifting weight. The pulling force during lifting should be within the range of the breaking tension of the wire rope divided by the safety factor, which is usually between 4 and 6.

2. Motivational factors

Motor and reducer: The motor power of the hoisting mechanism is the key. The greater the power, the greater the lifting torque that can be provided in theory. However, the power increase must match the crane structure. The transmission ratio and efficiency of the reducer are also important. The appropriate transmission ratio can increase the drum torque output, and the efficient reducer can reduce power loss, which helps to improve the lifting capacity.

3. Environmental and working conditions

Working environment: Working environment such as salt spray at the seaside and corrosive gases in chemical zones will corrode crane components. Corrosion will reduce the strength of beams, door legs, etc., thus affecting the lifting capacity. In this environment, anti-corrosion measures should be strengthened, and the strength reduction caused by corrosion should be considered when calculating the lifting capacity.

Working class: The working class (A1 - A8) of the crane determines the number of working cycles and load spectrum coefficient. Cranes with high working classes have frequent working cycles and a wide range of load variations. This requires a higher lifting capacity reserve, and the impact of frequent lifting and different load combinations on the fatigue life of structures and components must be considered in the calculation. For example, an A8-class crane in a busy port lifts hundreds of times a day, and the lifting capacity calculation must consider the durability and safety under such high-intensity work.

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