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christopher2021
Angemeldet seit:
01.07.2021
Beiträge: 5802
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Overview
This article mainly analyzes the differences between trolley ***** and hoist double girder overhead crane in structure, and also examining the weaknesses and lack of imported brands cranes, and the development prospect of China domestic crane industry.
overhead crane products
Crane designes from Chinese *****, Dongqi Hoist and Crane
Foreword
There are a large amount of overhead cranes used in industrial plants. According to the ***** of crane manufacturers, the industrial cranes can be divided into import crane and domestic crane. The well-known imported crane bands are like Demag Crane from Germany, Kone Crane from Finland, Spanco Crane and Gorbel Crane from America, etc. As for the Chinese domestic brand, there are Sany, XuGong, Weihua, and Dongqi Crane, etc. Yuantai Crane belongs to China domestic brand cranes.
Top crane manufacturers
Top Crane Companies
As you know, the price of the import cranes is higher, especially the price of the electric hoist, the price of which even catches up with the price of the whole set of overhead crane from Chinese domestic crane companies. Five years ago, the import cranes is superior in material , crane performance, compact structure design, high reliability, good appearance, thus they are the choices of many manufacturers. But today, you can see that the Chinese domestic crane machines have changed the situation through the crane technical and structure innovation. The best-selling imported cranes have brought challenges to Chinese crane manufacturing industry, and also promoted the development of the domestic crane industry.
The classification and features of Overhead Crane
At present, overhead cranes mainly include trolley overhead crane and hoist double girder overhead crane. The main differences of the two types overhead cranes is the hoisting mechanisms.
The hoisting mechanism of the trolley overhead crane is consisted the components such as drum, brakes, motors, etc. The running mechanism and motor brakes are installed separately, which are assembled into a trolley, and the overall volume of the trolley overhead crane is larger;
The hoisting mechanism of hoist double beam overhead crane is the electric hoist, with no drum, so the volume of the hoist crane is relatively small.
Trolley overhead crane can carry heavy duty working level, could be used in more complex, harsh working conditions, but trolley overhead cranes have complex structure, long manufacturing cycle, heavy weight, big wheel pressure and high plant cost.
In recent years, the trolley overhead crane with lifting capacity under 100 ton gradually has alternative products, the big tonnage hoist double girder crane. Demag Crane has already been producing 100 t hoist double girder overhead crane, and Kone’s 80 ton crane also uses electric hoist as lifting mechanism, in Chinese domestic crane market, there are also 80 ton overhead crane with electric hoist as hoisting mechanism, which is from the top brand crane company, Dongqi Hoist and Crane.
Advantages of imported overhead crane
Imported overhead crane, especially under 100 t crane, have been implemented with electric hoist as lifting mechanism, has the following features:
the hoist drived by frequency conversion motor,
realize the dual-speed running,
can achieve the A5 working level.
Imported brand cranes have advantages such as, advanced design, material performance is superior, compact dimension, low headroom, light weight, small wheel pressure, low energy consumption. These features to some extent, can reduce the plant height, reduce the cost of plant and operational cost savings.
Years ago, all these advantages are an objective reality. But at present, China domestic overhead crane also have this hoist overhead crane, and the lifting capacity have already up to 80 ton, some advantages of imported overhead crane have disappeared. The performance of domestic hoist overhead crane just like the imported brand crane, in terms of the wheel pressure, self-height, structure or energy consumption. China domestic crane took a big step to be the world brand.
Disadvantage of imported overhead crane
Combined with China's national conditions, the import brand cranes have many inherent disadvantages, which cause them can't be widely used in the domestic market.
1. High price of whole machine and spare parts
Same tonnage cranes, the price of imported brand is usually about 30% higher than domestic brands, some even are twice as many domestic prices. Import crane spare parts price is higher, some need to deliver goods from abroad, maintenance cost of the manufacturer at later period is higher. Most industrial and mining enterprises in China started late, capital strength is weak. Under normal circumstances, these enterprises are would rather spend more money on production equipment, instead of auxiliary lifting transport equipment.
2. Maximum lifting capacity is limited, working level is not high
At present, imported brand cranes have the main girder and end beam produced both by the domestic cooperation manufacturer, only the electric hoist is imported. Domestic application of imported brand overhead crane is generally no more than 80t, more than 100 t crane need corporation authorized to produce or to be imported from abroad. And, these imported cranes working level are intermediate duty, for some of the heavy intensity work (A6 and above) are not suitable.
3. Hoist lifting speed is slow
With 50t overhead crane as an example, the import brand crane use hoist as lifting mechanism, the fastest speed generally is 4 m/min, but domestic 50t overhead crane used are trolley, the fastest speed can reach 8 m/min, deputy lifting speed can reach 13 m/min. Therefore, for those enterprise who require higher lifting speed, the imported overhead crane does not have the advantage.
Conclusion
The threshold of the overhead crane is lower, China now has more than 1000 registered company crane. Especially in Henan Xinxiang development faster in recent years, which is known by “hometown of China crane".
The gap between China domestic overhead crane and imported overhead crane is more and more small, and the advantage of the imported crane is less and less obvious, domestic crane does not exist high cost disadvantage. Through continuous structure and technological innovation, China domestic crane industry gradually enters benign development stage, believe in the future domestic crane industry will produce more and more high quality and low price of crane products.
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