Comparison of imported bridge crane and China domestic overhead crane | Overhead Crane
Overview
This article mainly analyzes the differences between trolley overhead crane and hoist double girder overhead crane in formal structure, and also examining the weaknesses and lack of imported brands of cranes, development prospect of China domestic crane industry.
Foreword
There are a large of overhead cranes used in industrial plants. According to the classification of crane manufacturers, the crane can be divided into import crane and domestic crane. Such as Germany demag, Finland kone company belongs to import brand cranes; while the DQCRANES, Yuantai Crane belongs to China domestic brand cranes.
As you know, the import brand cranes price is higher, especially the price of the hoist even catch up with the price of domestic whole crane. Five years ago, import brand crane with material superior performance, compact structure design, high reliability, good appearance, more and more manufacturers use this crane. But today, you can see that the Chinese domestic have changed the situation through the crane technical and structure innovation. The Imported crane’s best-selling brought challenges to Chinese brand crane manufacturing industry, also promoted the development of the domestic crane industry.
The classification and features of Overhead Crane
At present, overhead crane mainly include trolley overhead crane and hoist double girder overhead crane. Difference of the two types overhead crane is hoisting mechanism, trolley overhead crane hoisting mechanism, such as drum, brakes, motors, running mechanism and motor brakes are installed separately, and then assembled into a trolley, the overall volume is larger; but the hoisting Machine of hoist double beam overhead crane is directly use hoist as lifting mechanism, no drum, so the volume is relatively small.
Hoist lifting mechansim
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 under 100 t gradually with alternative products, that is big tonnage hoist double girder crane. Such as Demag has already producing 100t hoist double girder overhead crane, Kone 80t crane is also use hoist as lifting mechanism, China domestic brand DQCRANES also use hoist as 80 t crane hoisting mechanism.
Trolley lifting mechansim
Advantages of imported overhead crane
Imported overhead crane, especially under 100 t crane, have been implemented with electric hoist as lifting mechanism, the hoist drived by frequency conversion motor, realize the dual-speed running, can achieve the A5 working level. Imported brand cranes have advanced design idea, 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, no matter the wheel pressure, self-height, structure or energy consumption. China domestic crane took a big step to be 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.
- 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 equipments, instead of auxiliary lifting transport equipments.
- Maximum lifting capacity is limited, working level is not high
At present, imported brand of crane main girder and end beam production both in the domestic cooperation manufacturer, only the 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.
- 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.
