How to choose gantry crane and main beam structure
Gantry cranes can be classified according to the structure of the door frame, the form of the main beam, the structure of the main beam, and the form of use.
Full gantry crane: The main beam has no overhang, and the trolley runs within the main span
Semi-gantry crane: The outrigger has a height difference, which can be determined according to the civil construction requirements of the site.
Double cantilever gantry crane: a common structural form, the force of the structure and the effective use of the site area are reasonable.
Single cantilever gantry crane: This structure is often selected due to site constraints.
How to choose gantry crane
The selection of gantry 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.
Span and cantilever length
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.
Three, the principle of determining the wheelbase
It can meet the stability requirements of the mast along the crane track.
The external dimensions of the cargo should be able to smoothly pass through the flat steel frame of the outrigger.
During the work of the gantry crane, there should be a certain amount of space between the external dimensions and the cargo and transportation vehicle channels of 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.
Lifting machinery mainly includes bridge erecting machines, gantry cranes, gantry cranes and other performance types, and there are more large-scale equipment in these lifting machinery, so the relationship between various components also increases. We must ensure that the contact state between the various parts of the crane is very good, that is, no oil-free phenomenon can occur. Doing a good job in the lubrication management of hoisting machinery and equipment can greatly increase the production efficiency of cranes and improve the product quality of hoisting machinery.