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Gantry cranes are bridge-type cranes that are supported on the ground track by the outriggers on both sides. Structurally by the gantry, trolley running mechanism, lifting trolley and electrical parts and other components. Some gantry cranes only have outriggers on one side, the other side of the support in the plant or trestle running, called semi-gantry cranes. Gantry crane gantry upper bridge (including the main beam and end beams), outriggers, lower beams and other parts of the composition. In order to expand the crane operating range, the main beam can be extended to one side or both sides beyond the outriggers, forming a cantilever. Lifting trolley with jib can also be used to expand the crane operating range through the pitch and rotation of the jib.
Form classification
Gantry cranes can be categorized according to the form of gantry frame structure, according to the form of main beam, according to the structure of main beam, and according to the form of use.
Gantry structure
Gantry cranes and cantilever gantry cranes
*Gantry crane
1. Full gantry crane: the main beam has no overhang, and the trolley is carried out in the main span;.
2.Semi-portal crane: the outriggers have height difference, which can be determined according to the civil construction requirements of the use site.
*Cantilever gantry crane
1.Double cantilever gantry crane:The most common form of a structure, the force of its structure and the effective use of site area are reasonable.
2. Single cantilever gantry crane: this structural form is often chosen due to site constraints.
*Main girder form
1. Single main girder
Single girder gantry crane structure is simple, easy to manufacture and install, its own quality is small, the main beam is mostly for the off-track box frame structure. Compared with double girder gantry cranes, the overall stiffness is weaker. Therefore, when the lifting capacity Q ≤ 50t, span S ≤ 35m, this form can be used. Single girder portal crane portal leg has two forms: L-type and C-type, L-type is easy to manufacture and install, good stress condition, small mass, but the space for lifting goods through the legs is relatively small, and the C-type legs are made into inclined or curved shapes, which aims to have a larger transverse space so that the goods can pass through the legs smoothly.
2. Double Main Girder
Double girder gantry cranes have strong load carrying capacity, large span, good overall stability, many varieties, but their own quality and the same lifting capacity of the single girder gantry cranes compared to larger, more expensive. According to the different structure of the main girder, it can be divided into two forms: box girder and truss. Generally, box structure is used.
Main girder structure
1. Joist beam
The structural form welded with angle steel or I-beam has the advantages of low cost, light weight and good wind resistance. However, due to the many welding points and the defects of truss itself, truss girder also has the disadvantages of large deflection, small stiffness, relatively low reliability and frequent testing of welding points. It is suitable for sites with lower safety requirements and smaller lifting capacity.
2. Box Beam
Using steel plate welded into a box structure, with high safety, high stiffness and other characteristics. Generally used for large tonnage and large tonnage gantry cranes. Such as the right figure MGhz1200, lifting capacity of 1200 tons, the largest gantry crane in China, the main girder uses a box girder structure. Box girder also has the disadvantages of high cost, self-importance and poor wind resistance.
3. Honeycomb girder
Generally referred to as "isosceles triangular honeycomb girder", the main girder end face is triangular, both sides of the sloping belly of the honeycomb holes, the upper and lower strings. Honeycomb girder absorbs the features of truss girder and box girder, and has larger stiffness, smaller deflection and higher reliability than truss girder. However, due to the use of welded steel plates, the deadweight and cost are slightly higher than that of the truss beam. It is suitable for sites or girder yards with frequent use or large lifting capacity. Since this type of girder is a patented product, there are fewer manufacturers.
1. According to the shape,the grab can be classified into clamshape grab and orange peel grab, the former consists of two complete buckets, and the latter is made up of three or more than three jaws.
2. It ia mainly designed for handing of power and fine bulk materials such aschemicals,fertilizer,grain,coal,coke,iron ore,sand,particle consreuction materials and amashed rocks etc.
3. It has been widely used in ports,steel plants,power stations,ships and garbage treatment,plants,and is used together with tower cranes,ship cranes,ship unloaders,traveling cranes and other type of cranes.Under running cranes or bridge crane are distinguished by the fact that they are supported from a ceiling structure and run on the bottom flange of structural members
| lifting weight/t | 5 | 10 | 16/3.2 | 20/5 | 32/5 | 50/10 | ||
| working class | A5~A8 | |||||||
| span/m | 18~35 | |||||||
| lifting height/m | main hook | 10~11 | 10~12 | |||||
| aux hook | 10.446~12.918 | |||||||
| speed(m/min) | lift | main hook | 11.3 | 8.5 | 7.9 | 7.2 | 7.5 | 5.9 |
| aux hook | 14.6 | 15.4 | 15.4 | 10.4 | ||||
| trolley travel | 37.3 | 35.6 | 36.6 | 36.6 | 37 | 36 | ||
| cart travel | 37.3~39.7 | 39.7~40.1 | 37.3~39.7 | 39.7 | 39.4 | 38.5 | ||
| steel track | 43kg/m | 43kg/m or QU70 | ||||||
| power supply | 3-Ph A.C.50Hz 380V | |||||||
| We can design and manufacture all kinds of non-standard product according to your requirement. | ||||||||
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