The world's leading products such as 3000-ton crawler cranes, 101-meter carbon fiber long-boom concrete pump trucks, and large-scale full-section tunnel boring machines have been born. Piling machinery and other products have ranked first in the domestic market for many years. Sany Group and Zoomlion's excavating machinery, piling machinery, crawler cranes, mobile port machinery, road machinery, and coal boring machinery are the first brands in China, and the market share of concrete machinery, tower cranes and other products is stable. The world's first.

Multiple "firsts" have made the Changsha construction machinery industry a thunderous.

To conquer core key technologies, leading companies spare no effort. However, due to the lack of effective cooperation between the host companies, the core competitiveness of the supporting industries of the Hunan construction machinery industry cluster is not strong, such as engines, chassis, gearboxes, oil pumps, main bearings, motors, batteries and other core components in the province. The matching rate is almost zero. .

What is exciting is that in recent years, Changsha's construction machinery supporting enterprises have been working hard to practice unique secrets and have gained a firm foothold in the fierce battles.

Chip sensor independently developed by Qitai.

Thousands of hard work, reveal a "China Sensing Core" business card

The long-term dependence on imports of key components such as hydraulic sensors has always been a pain in the domestic construction machinery industry.

A construction machine has a huge body, but it is inseparable from the precise transmission of a small hydraulic sensor. The sensor chip is only the size of a button, but the base is densely covered with network cables. Its core technology has long been mastered by developed countries in Europe and the United States.

After years of research and exploration, Hunan Qitai Sensing Technology Co., Ltd. (hereinafter referred to as Qitai Sensing) has built my country’s first mass-produced metal-based thin film pressure-sensitive chip production line and sensor packaging line with completely independent intellectual property rights, filling The blank of the large-scale production line of our factory.

The metal-based pressure sensor is packaged with a metal-based pressure-sensitive chip independently developed and produced by Qitai. It can meet the comprehensive accuracy of 0.1 level or more in the pressure range of 0.5MPa to 500MPa, and has long-term fatigue resistance, wide temperature range, and high overload resistance. , Good stability, high reliability, etc. The company has an annual mass production of 6 million chips and 2 million pressure sensors, which can completely solve the long-term dependence on imports of high-end equipment hydraulic system pressure sensors in my country's military, aerospace, and construction machinery.

In the small batch application test results of Sunward, Hengtian 9th Five-Year Plan, Sany Heavy Industry, Zoomlion, etc., the Qitai chip sensor has reached the international quality level of similar products. Qitai Sensing has an existing sensor production line with an annual production capacity of 2 million sensors. Three production lines are planned for the second phase of the project, with an annual output value of 5 billion yuan.

“The annual demand for hydraulic sensors in Hunan construction machinery is 600,000. After the assembly line equipment that the company is commissioning reaches production, the annual production capacity is 2 million, which can completely realize local matching.” Qitai Sensing chairman Wang Guoqiu said that the company is expected to win this year. The "Made in Changsha" sensors will be used in world star products such as concrete pump trucks and excavators for batch orders from host companies such as Sany and Zoomlion.

Reducer series products developed by Wanxin Precision.

"Reducer" helps, and key components replace "accelerated running"

A small precision instrument—reducer is indispensable in large-scale machinery assembly such as cranes and excavators. It is equivalent to a car gearbox, which can increase the output torque while reducing the speed and reduce the inertia of the equipment load.

Located in Ningxiang High-tech Zone, Wanxin Precision (Hunan) Co., Ltd. (hereinafter referred to as "Wanxin Precision") is the only reducer manufacturer in Hunan and the most core supplier of Changsha construction machinery. It will be the Sany Heavy Industry Tower in 2020. The reducer was developed and formulated by the machine, and it was supplied in batches in the fourth quarter of last year. It is estimated that the supply for Sany Crane will be around 50 million yuan this year. At present, we are working with Sany Heavy Industry to develop a permanent magnet motor. This customized reducer can save 20% energy for related products and equipment, and reduce maintenance costs in use.

In the field of reducer products, the technology of developed countries such as the United States, Japan, and Switzerland is still at the leading level. In addition to the harmonic reducer, other reducer products have been independently developed and produced in Wanxin Precision. In 2020, the company's production capacity will be 700,000 units, and this year it is expected to be close to 1 million units. Some simple products can be delivered within 7 days, and complex ones will not exceed 30 days. The performance of the product is comparable to that of Japanese and American products, but the price is generally only half or even one-third of imported products.

"Hunan reducer products only account for 3% of the national share. The sales of products in the province only account for about 10% of the total sales of the enterprise. The future construction machinery market in the province has great potential." said Ou Lang, assistant general manager of Wanxin Precision. In the future, the company will accelerate the pace of extensive cooperation with local host companies such as Zoomlion, Xingbang Heavy Industry, and Sunward Intelligent.

Changsha held a matchmaking event for construction machinery masters.

Give full play to the synergy of the main distribution and focus on "make up for the shortcomings"

It is undeniable that only by breaking through some key core technologies and improving the level of construction machinery production technology can the core competitiveness of the construction machinery industry be enhanced.

The host company has become a "veteran", and the glory is still there. As a supporting enterprise of the "young and strong faction", it is flourishing.

In 2020, the Changsha Construction Machinery Industry Association (hereinafter referred to as the "promotion agency") actively promoted the docking between the supporting enterprises of Changsha construction machinery and the main engine enterprises. Qitai's hydraulic sensors and main engines have successfully adapted, and have taken steps to solve the problem of "sensing in the construction machinery industry". The first step in the pain of “core”.

Under the overall coordination of the promotion agency, Changsha Construction Machinery Cluster has developed 102 new products and 120 new technologies, of which 5 products are domestic and even global firsts, breaking through a number of "stuck neck" bottlenecks. The promotion agency also makes full use of the influence of leading enterprises to attract the participation of superior supporting enterprises and some universities and R&D institutions. It is preparing to establish a "national construction machinery manufacturing innovation center" to better serve the construction of industrial clusters.

"Focusing on high-end host products such as mid-to-high-end construction machinery, underground engineering equipment, and other special construction machinery, as well as core components, software and hardware, and key basic materials, we and the company have researched and planned a number of technologies and products that will lead the development of the construction machinery industry." Wu Jingsheng, vice president and secretary-general of Changsha Construction Machinery Association, said that in the future, Changsha construction machinery clusters will focus on intelligent, personalized, energy-saving and environmental protection, economy, high reliability, and comfort. And hybrid products, intelligent hydraulic cylinders, pumping systems, IoT platforms and other key areas, to achieve independent breakthroughs in core technologies and leading beyond.

Original link：https://cs.rednet.cn/content/2021/04/10/9173457.html