Looking forward to the future development trend of the tower crane industry


发布时间:

2019-03-28 10:18

From 2017 to 2018, my country's tower crane manufacturing industry experienced the fastest growth. In recent years, the number of tower crane manufacturing enterprises has soared from more than 280 to nearly 600. This is mainly due to the 4.8 trillion investment effect. By 2018, as the investment effect of 4.8 trillion yuan subsided, the growth of the entire industry of tower crane manufacturing declined. It has become an indisputable fact that China's economic growth will continue to slow down in the next five years. This is a rare good opportunity for the country to "adjust the industrial structure and change the development mode". Similarly, the tower crane manufacturing industry is also facing adjustments. The adjustment of the tower crane manufacturing industry will present three trends: First, the industry will speed up the reshuffle, eliminating the inferior and reserving the superior; second, the modernization level of the industry's production and manufacturing will be improved, thereby improving production efficiency and product quality; third, the concentration of the industry It will continue to improve, that is, some large-scale manufacturing enterprises will emerge.

 

The industry will accelerate the reshuffle. From 2017 to 2018, tower crane manufacturing companies have soared from more than 280 to nearly 600. This is the effect of economic stimulus on the one hand, and the threshold for tower crane manufacturing is low on the other hand. As the country's economic growth slows, market demand will shrink significantly compared to 2012-2013. At the same time, users' awareness of tower crane product quality continues to improve, and some small-scale enterprises with poor product quality and performance will continue to be eliminated.

 

The modernization level of production and manufacturing in the industry will continue to improve. Tower crane is a kind of non-compact equipment, and structural parts account for a large proportion of products, but the processing accuracy requirements of these structural parts are equivalent to those of machined parts. Therefore, the rationality of the manufacturing process and the modernization level of the production process equipment have a great relationship with the production efficiency, product quality and production cost.

 

The rationality of the manufacturing process flow refers to the rationality of the whole process from raw material processing, welding, machining to painting, which has a direct impact on production efficiency. The second is the modernization of process equipment, which has a direct impact on product quality. At the same time, the improvement of the modernization level of process equipment can minimize the dependence on labor, thereby reducing labor costs. However, the modernization of the manufacturing process of tower crane manufacturers is not just to add a few welding robots, but to systematically modernize the entire process. This first requires a correct understanding of the concept. At present, there are only a few construction elevator manufacturing enterprises in China, which have basically realized the modern production and manufacturing of technological processes and technological equipment. This is also the direction that the tower crane manufacturing industry needs to work on, as well as the future development trend.

 

The concentration of the industry will continue to increase. In 2018, relevant agencies made a statistics on the concentration of the tower crane manufacturing industry. The concentration of the industry was 28%, far lower than 99.5% for truck cranes, 99% for crawler cranes, and 99% for loaders. %, and the industry concentration level of other construction machinery such as concrete delivery pumps. The level of industry concentration reflects the degree of standardization of an industry and the "transparency of price-performance ratio" of products. Although the concentration of tower crane manufacturing industry has improved in recent years, the development of the entire industry is still very unbalanced, especially the level of industry concentration and product cost performance transparency level is still relatively low. It is mainly reflected in the large gap in product configuration, performance, quality, etc., but the price gap is not large.

 

In the next five years or so, through the accelerated reshuffle of the industry, the elimination of the inferior and the preservation of the superior, and the continuous improvement of the modernization level of production and manufacturing, the industry concentration will continue to increase.

 

The future development trend of tower crane products It has been almost 30 years since the introduction of foreign tower crane technology in the 1980s. In the past 30 years, China's tower crane manufacturing has made great progress, but the technical level of tower cranes has not improved much. With the development of science and the progress of the times, tower crane products will continue to improve.

 

There are three trends in the future changes of tower crane products: one is the trend of flat head of medium-sized tower cranes (63t.m~500t.m) and the boom of large tower cranes (above 600t.m); the second is the three major mechanism technologies of tower cranes The performance will continue to improve, especially the performance of the hoisting mechanism will continue to improve; third, the application of digital technology in the tower crane control system will continue to popularize.

 

Trend of flat head of medium tower crane and boom of large tower crane (1) Advantages of flat head of medium tower crane. The advantages of the flat head of the medium tower crane are reflected in the two aspects of manufacture and use. a. Manufacturing advantages. The manufacturing of flat-top tower cranes can achieve modular production to a greater extent, which can promote enterprises to improve the modernization of process equipment and production methods, and the modernization of process equipment and production methods can improve production efficiency, improve manufacturing accuracy, and reduce production costs.

 

b. Use Advantages. One is the modular structure of the flat-top tower crane, which can minimize the tonnage of the lifting equipment during installation and removal. Compared with the hammer-head tower crane, the installation and removal are safer. Second, in the future, the scale and volume of engineering projects will become larger and larger, and the density of group tower operations will become larger and larger. The mutual interference of flat-top tower cranes is better than hammer-head tower cranes.

 

In addition to the above advantages, the force directions of the upper and lower chords of the boom are the same when the flat-top tower crane is in different working radii, while the boom of the hammer-type tower crane is a statically indeterminate structure. When the machine is in different working radius, the force of the upper and lower chords of the boom is changed. This is also a major advantage of flat-top tower cranes. It should be said that the flat head of medium-sized tower cranes is an inevitable trend of technological progress and the progress of the times.

 

(2) Large tower cranes take the advantage of boom. The technical performance of the three major mechanisms of the tower crane will continue to improve. But at present, there is a big gap between the technical level and performance of the tower crane hoisting mechanism in my country. In terms of technology and use, the hoisting mechanism of medium-sized and medium-sized (150t.m~500t.m) tower cranes should adopt orthogonal cylindrical gear reducers, L-shaped layout, and variable frequency speed regulation. This will become the changing trend in the future. At present, several reducer factories in China can basically meet the needs of the hoisting mechanism configuration of medium-sized tower cranes.

 

The application of digital technology in tower crane control system will continue to popularize. At present, digital technology is widely used in various fields and industries, but the application in tower crane products has not been fully reflected, especially the limitations of various parts of tower cranes. Bit devices are almost always mechanical. In the past two years, some manufacturers have also produced some electronic products, but these products have many functions. In addition to meeting the basic control and anti-collision of tower cranes, they also have GPS positioning and powerful data management functions. More importantly, the product prices are too high. So it can't be popularized.

 

Digital technology is used in tower crane control system, mainly to realize digital monitoring of torque limit, lifting weight limit, lifting limit, rotation limit, amplitude limit and so on. The principle is to use sensors and proximity switches to collect information, process the data through amplifiers and analog and digital conversion (A/D conversion), and single-chip computer, and perform switching input and output conversion (I/O conversion). agency controls. According to the above control principles, the cost of a digital control system for a medium-sized tower crane should be within 5,000 yuan, which is easier to be accepted by users and easy to promote and popularize. However, the performance of the tower crane will be substantially improved.

 

The application of digital technology to the tower crane control system has the following advantages: First, the control accuracy of each limit of the tower crane is greatly improved. Second, the operator can monitor the tower crane operation in real time. The third is to have "fault tolerance" and "interlock" functions, such as tower cranes can avoid misoperation when jacking up. 4. It has anti-collision function for group tower operation. In a word, the application of digital technology to the tower crane control system can make a qualitative improvement in the intelligent level of the tower crane, and the safety of the tower crane will also be greatly improved.

 

The tower machine is a non -compact device, and its own technical nature is not very high. In the future, there will be improvements and breakthroughs in technology. First, the frequency conversion hoisting mechanism with a motor power of more than 55KW should realize the secondary inversion of the current, that is, the hoisting mechanism is lowered, and the motor is in the power generation condition. Feedback to the power grid current to save energy. But this is largely due to changes in the concept of production and use. Then there is the improvement of the intelligent level of tower cranes, and the improvement of the intelligent level will increase the application of digital technology. Then there is the improvement of the intelligent level of tower cranes, and the improvement of the intelligent level will increase the application of digital technology.

 

In the next 20 years, it will still be the golden development period of the tower manufacturing industry. However, market competition and industry competition will become more intense. Enterprises with a certain scale and strength should improve their innovative thinking and innovation capabilities, especially to continuously improve the modernization level of production and manufacturing, enhance the competitiveness of enterprises in the industry, and lead the development of the industry.

 

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