How To Choose A Gantry Crane To Buy?

Knowing what types of cranes there are can help you make the right choice and bring you certain convenience during use, but you should also know where to buy it. Since there are many purchasing channels now, if you are unable to find some appropriate purchasing channels, it may also easily cause you a lot of trouble. At present, we recommend that you find out whether you should choose to find the appropriate purchasing channels. Some professional manufacturers come to provide purchasing services for themselves. This is a better method. The machines provided by these professional manufacturers can have a relatively good quality. There is no need to worry about them during use. There may be certain problems, which will not only bring you It provides a good user experience, and it can also provide you with post-service services, so choosing to find the manufacturer to purchase is a relatively recommended method. You can learn more about which manufacturers are more worthy of your choice. It is generally recommended to find some manufacturers that have received a lot of recognition.

 

 

Buying a crane has become more and more common now. Choosing to use this kind of machine can also bring a lot of help during the construction process. It can generally lift some items very well. If you need to choose Using this kind of machine, I suggest that you learn more about it, which can be of great help to you. For example, which brand of crane should you choose? How many types are there (taking gantry cranes as an example)?

 

1. Demag
Demag Hoisting Machinery Co., Ltd. is known as the "hoisting machinery expert". The history of Demag Hoisting Machinery began in 1819 in the machinery factory in the Weittrull district. In 1840, it began to produce bridge cranes, focusing on Specializing in the production of cranes and crane components, DEMAG has been at the forefront of the world's top crane brands since the day it launched the world's first steam crane at the Vienna Exposition in 1873. But correspondingly, its price is also very expensive.

2. ZOOMLION

Zoomlion Heavy Industry Co., Ltd. was founded in 1992 and is mainly engaged in the R&D and manufacturing of high-tech equipment such as engineering machinery, environmental industry, and agricultural machinery. Zoomlion has been listed in Shenzhen and Hong Kong, becoming the first A+H-share listed company in the industry. It ranks first in the country in terms of construction machinery and sanitation machinery, and ranks among the top three in agricultural machinery. However, Zoomlion's performance in excavators is poor, with average performance in various indicators, and after-sales service also needs to be improved.

 

3. Henan Dejun Co., Ltd.

Henan Dejun Industrial Co., Ltd., is mainly based on the two major business sectors of lifting machinery and steel structure. Large-scale enterprises supplemented by related services such as lifting equipment transportation and installation, leading the production of single and double girder bridge gantry cranes, electric hoists, etc. And to undertake steel structure projects, and supporting services for machinery, metallurgy, electric power, railway, mining, petroleum, chemical, and other industries.

 

 

Gantry crane classification

 

According to the structure form of crane door frame

 

According to the appearance and structure of the door frame, it can be divided into gantry crane and cantilever gantry crane.

 

 

Gantry cranes are further divided into:

 

1. Full gantry crane: the main beam has no overhang, and the trolley moves within the main span.

2. Semi-gantry crane: The outriggers have height differences, which can be determined according to the civil engineering requirements of the site.

 

 

Cantilever gantry cranes are further divided into:

 

1. Double cantilever gantry crane: The most common structural form, the stress of the structure and the effective use of the site area are both reasonable.

2. Single cantilever gantry crane: This structural form is often selected due to site restrictions.

 

Classification according to the appearance style of the main beam of gantry crane:

 

1. Complete classification of single main girder gantry cranes

The single main girder gantry crane has a simple structure, is easy to manufacture and install, and has a small mass. Most of the main girder is a deflection box frame structure. Compared with double main girder gantry crane, the overall stiffness is weaker. Therefore, this form can be used when the lifting capacity Q≤50t and the span S≤35m. Single girder gantry crane door legs are available in L-type and C-type. The L-type is easy to manufacture and install, has good stress resistance, and has a small mass. However, the space for lifting goods to pass through the legs is relatively small. The legs of the C-type are made in an inclined or curved shape in order to have a larger lateral space so that the goods can pass through the legs smoothly.

2. Complete classification of double main girder gantry cranes

Double main girder gantry cranes have strong load-bearing capacity, large spans, good overall stability, and many varieties. However, compared with single main girder gantry cranes with the same lifting capacity, their own mass is larger and the cost is higher. According to the different main beam structures, it can be divided into two forms: box beam and truss. At present, box-shaped structures are generally used.

 

Classification according to the main beam structure of gantry crane:

 

1. Truss beam

The structural form welded by angle steel or I-beam has the advantages of low cost, light weight and good wind resistance. However, due to the large number of welding points and the defects of the truss itself, the truss beam also has shortcomings such as large deflection, low stiffness, relatively low reliability, and the need for frequent detection of welding points. It is suitable for sites with lower safety requirements and smaller lifting capacity.

 

2. Box beam

Steel plates are welded into a box structure, which has the characteristics of high safety and high stiffness. Generally used for large-tonnage and ultra-large-tonnage gantry cranes. As shown in the picture on the right, MGhz1200 has a lifting capacity of 1,200 tons. It is the largest gantry crane in China. The main beam adopts a box girder structure. Box beams also have the disadvantages of high cost, heavy weight, and poor wind resistance.

 

3. Honeycomb beam

Generally referred to as "isosceles triangle honeycomb beam", the end face of the main beam is triangular, there are honeycomb holes on the oblique webs on both sides, and there are chords on the upper and lower parts. Honeycomb beams absorb the characteristics of truss beams and box beams. Compared with truss beams, they have greater stiffness, smaller deflection, and higher reliability. However, due to the use of steel plate welding, the self-weight and cost are slightly higher than that of truss beams. It is suitable for sites or beam sites with frequent use or heavy lifting capacity. Since this beam type is a patented product, there are fewer manufacturers.