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The use of cranes and energy-saving applications

July 14, 2021

(1) Single and double girder overhead crane


Under normal circumstances, the lifting weight is less than 50t, the span is less than 35m, and there is no special use requirement, the single main beam type should be selected. If the door leg width is large, the working speed is high, or heavy and long pieces are frequently lifted, the double-beam gantry crane should be selected.


(2) Span


The span of the gantry crane is an important factor affecting the quality of the crane itself. In the selection, the span should be minimized on the premise that the equipment use conditions and the span series standards are met.


(3) Wheelbase determination


(a) It can meet the stability requirements of the mast along the crane track

(b) The external dimensions of the cargo should be able to pass smoothly through the flat steel frame of the outrigger

(c) Pay attention to make the track B and the span S have a certain proportional relationship, generally take the track B=(1/4-1/6)S.


(4) Spacing size


During work, there should be a certain amount of space between the external dimensions of the gantry crane and the goods and transportation vehicle channels in the yard to facilitate loading and unloading operations. Generally, when loading and unloading in the span, transportation vehicles should keep a distance of more than 0.7m from the door legs. The spreader should have a distance of more than 0.5m from the transport vehicle when it is not working, and should have a distance of more than 0.5m when the goods pass through the door legs.


(5) Electrical equipment


It should comply with the relevant regulations of general gantry crane GB/T14406-1993.

Folding energy-saving applications

Bridge crane is a kind of hoisting machinery widely used in industrial and mining enterprises. A locomotive depot is now equipped with multiple bridge cranes, which are frequently used every day and the workload is heavy. Whether the bridge crane can work normally has a direct impact on the completion of locomotive maintenance tasks and the safety of personnel and equipment. The previously used bridge crane driving system adopts a winding AC asynchronous motor, and multiple external resistors are connected in series in the rotor circuit for speed regulation. The cam controller and relay-contactor control are adopted. The main disadvantages of this control system are:

Motor rotor series resistance speed regulation is energy-consuming slip speed regulation, with large energy consumption, soft mechanical characteristics, small speed regulation range, and poor smoothness;


The mechanical shock is large, which affects the service life;


Therefore, only by completely changing the original speed regulation method can the problem of high failure rate of bridge cranes be fundamentally solved. With the rapid development of electronic technology, the performance and reliability of the frequency converter have been greatly improved, which provides favorable conditions for the application in the transmission system of the bridge crane. First of all, we carried out frequency conversion transformation on the large and small car drag system and hook lifting system of the 32-ton bridge crane, which is responsible for the important work of locomotive diesel engine assembly, to improve its operating performance and reduce the failure rate.


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