China wind power bearing in a stage in a long rely on foreign imports, the price is expensive, increasing the cost per kilowatt of wind power equipment, and restricted the decline in the cost of wind power.
Domestic enterprises to explore the progress.
Currently, the domestic wind power bearing gradually formed a large-scale, serial production, the main enterprises ZWZ, glue gun Los shaft, Research Technology, radius support, Shanghai United, and other related enterprises.
China Bearing Industry Association, according to staff revealed that wind bearings, yaw bearings and pitch bearing relatively low technical threshold, while the growth rate of the spindle bearings and high-tech devices bearings, generator bearings essentially mature technology generic products. Currently, the domestic wind power bearing capacity of enterprises focused on changes in the yaw bearing and bearing on the pulp, and to 3 megawatts of wind power equipment for the main bearings for the spindle bearings and bearing accelerator, glue stick the basic dependent on imports, only the individual Initial involvement of domestic enterprises.
It is understood that the bearing industry in China wind power bearing on the design, manufacturing and testing techniques are far from fully digested, such as the spindle bearing is what kind of bearings as well, which pitch is a structure bearing slewing ring as well, slewing bearing raceway hardened teeth and how to prevent cracks, how to ensure that the surface hardness and hardened layer depth is still at an exploratory research into difficulty.
Recently, ZWZ learned from Dalian, but also supporting a number of major equipment for the country's high-end bearing products successfully produced here, to fill the gap: 5 MW wind turbine pitch bearing sent to the user installed; completion of the main shield bearings and bearings and other R & D hob and start vibrating screen installed test; large portfolio backing, precision, sealed bearings successfully developed, through the user's acceptance of ... ...
At the same time, a total investment of 500 million yuan Shanghai Electric's wind power bearing large clean and efficient production line technological transformation project completion and operation of the first units of 3.6 MW offshore wind power bearing off the assembly line. Shanghai Electric from the introduction of technology to the joint design, and then to independent development, out of the bearing on the development of a new road. At present, China's technological development capability and technical personnel, process control have reached the international level, the cost of imported bearings only about 2 / 3, after mass production is expected to drop to import bearings 1 / 2.
While filling the gaps in a day, but domestic companies focused their attention on the global trend, the progressive realization of high-end products bearing the efforts of industrial upgrading, will change many of our key focus areas of technology and equipment on high-precision, high reliability, high speed bearing long-term dependence import condition.
Bearings are of the soft underbelly of wind power equipment manufacturing.
In recent years, the rapid development of China's equipment manufacturing industry, but for major equipment, but most of the bearings supporting the high dependence on imports, bearings and other core components of major equipment has become a bottleneck in the development countries. "Rapid development of domestic high-speed railway, but the bearing has become a serious bottleneck. United States and Europe can meet the current high iron bearing 350-400 kilometers per hour demand, and our current high-speed bearings 150-180 km can only meet the EMU . "industry, for example. In addition, large wind turbine bearings, turntable bearings deep drilling rig, offshore drilling platforms and other energy equipment series bearings are high-end bearings are also the weakness of domestic enterprises.
It is understood that an important use of precision large bearing for wind generator. Wind turbine bearings including: yaw bearings, spindle bearings, transmission bearings, generator bearings.
Kyushu Electric is responsible for a wind power source told the author, as a fan of the important supporting equipment of a broken machine manufacturers, wind power bearing the force and vibration of the complex, under heavy shock load, and yaw, pitch bearings higher installation costs, and need to achieve with the same host at least 20 years of life. Because wind power equipment, harsh working conditions and long life and high reliability requirements, making wind power bearing with high technical complexity, is recognized as the most difficult the localization of two parts (bearings and control system) is one.