 |
Jiangsu qianfeng Fasteners CO.,LTD ADD:66,xinning road,jiang an economic developmentarea,rugao nantong,jiangsu,china Tel :0513-87956999 8795768 Fax:0513- 87957089 Mobile:13901429661（qiangkun,he） E-mail：postmaster@jsqianfeng.com maomao@jsqianfeng.com Http://www.jsqianfeng.com
|
|
|
| Home-
News
|
Economic structure of wind power fastener industry in China |
| Update:
2013-3-28 |
| From the value point of view, although the proportion of the size of the order of the same, but the specific value is changed obviously, the main business income of private enterprises as an example, the proportion dropped to 44.94%, while the proportion of foreign-invested enterprises increased significantly, up to 32.61% shares, and limited the proportion also increased but, do not increase, accounting for 18.69%; while the proportion of foreign investment enterprises total profit is far more than the private enterprises reached 44.48%, private enterprises accounted for 36.13%, which reflects the industry enterprises in China, a large number of fasteners smaller, the overall strength is not strong features, technical advantages, fasteners enterprise products the advantages and market advantages mainly concentrated in foreign invested enterprises. Wind power fasteners are two or more than two parts (or components) of the fastener connection as a whole when used in a class of mechanical parts. The market is also known as the standard parts. The bolt is composed of a head and a screw (a cylinder with an outer screw thread), and a type of fastener which is composed of two parts, which is matched with a nut, and is used for fastening and connecting two parts with through holes. This type of connection is called bolt connection. If the nut is screwed down from the bolt, the two parts can be separated so that the bolt connection is detachable and connected. No stud head, a fastener only at both ends with outer thread. One end of the connecting piece must be screwed into a part with inner screw holes, and the other end passes through the part with through holes, and then the nut is screwed, and the two parts are connected to form a whole. This type of connection is called stud connection, which is also a detachable connection. The high strength fasteners used in the wind power field are in poor condition because of the long field service, poor maintenance condition, so the stability of the wind turbine is strong. Under normal working conditions, the wind power fasteners must be guaranteed for more than 15 years of service life. Wind power high strength bolts most of the choice of 10.9, a small amount of 8.8. High strength bolts of grade 10.9, 32 ~ 39HRC, the hardness, tensile strength Rm elongation is larger than 1040MPa, A = 9%, Z = 48% section shrinkage, low temperature impact strength (-45 C) KV2 = 27J. |
|
|
