Splices are used for splicing or repairing conductor and ground wire of overhead transmission lines. The splices may be compression type, bolt type performed armour rods in accordance with the construction and mounting way. The compressive splices have hydraulic, explosive and notched type.
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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Analysis of the development status of fan bearing skills Analysis of the development status of fan bearing skills
At present; domestic wind power projects are vigorously developed; the domestically developed fan bearings are primarily transmission bearings and motor bearings; but the function and lifespan are still not up to demand. Therefore; about 90% of transmission bearings and motor bearings still rely on imports. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
At present; domestic vigorous development of wind power projects; domestically developed fan bearings are primarily transmission bearings and motor bearings; but the function and lifespan are still not up to demand. Therefore; about 90% of transmission bearings and motor bearings still rely on imports. Yaw bearings The assembly of the assembly and the blade spindle bearing is still under development; there are a few large-scale state-owned enterprises such as Luo axis and tile axis in China; there are few manufacturers producing it; it is a domestic blank.
The development and development of fan bearings; the main technical difficulties are the sealing layout and smooth grease required for longevity, the unique raceway processing method and heat treatment skills, the unique cage depiction and processing methods, etc. The current domestic skill level and There are relatively large distances in foreign advanced countries; however, in recent years, some research units in China have achieved some breakthrough research results in these aspects; it is necessary to accelerate the process of localization of fan bearings.
Key analysis of fan bearing skills
1.1 yaw bearing assembly (660PME047)
The yaw bearing assembly is a guarantee for the wind turbine to track the wind direction change in time. When the fan starts to deflect, the yaw acceleration ε will generate the impact torque M=Iε (I is the cabin inertia). The higher the yaw speed Ω; the acceleration ε It is also larger. Because I is very large; this makes the original large impact force multiplied. Others; if the fan deflects during the movement; the yaw gear will accept a considerable gyro moment; simply form the yaw bearing Fatigue failure.
According to the force characteristics of the fan bearing; the yaw bearing adopts the four-point contact ball bearing depicted by “zero clearanceâ€; the channel is uniquely depicted and processed; it can accept large axial load and moment load. The yaw gear should be selected appropriately. Data, modulus, tooth surface summing and hardness; to ensure the match between the life and the automatic gear. Together; to adopt a targeted heat treatment; improve the tooth surface strength; make the bearing have excellent wear resistance and resistance Impact.
The fan is exposed in the field; therefore, there is a severe demand for the sealing function of the bearing; it is necessary to optimize the depiction of the sealing method of the bearing; to simulate the sealing function of the bearing; to ensure that the bearing life is the same as the life of the fan. Installed at an altitude of 40m; the cost of assembly and disassembly is expensive; therefore, it is necessary to have very high reliability; usually 20 years of life is required; plus the bearing layout is messy; therefore, computer simulation experiments are necessary before the installation experiment; Bearing drawing parameters are correct.
1.2 Wind blade spindle bearing (24044CC)
The main shaft of the blade is supported by two spherical roller bearings. Because the main shaft of the blade receives a very large load; and the shaft is long; simple deformation; therefore; the bearing needs to have an excellent centering function.
Determine the internal layout parameters of the bearing and the layout of the cage; make the bearing have outstanding functions and longevity.
1.3 There are many kinds of bearings in the transmission bearing transmission; the first is to make the gear oil in the gearbox smooth. There are more metal particles in the smooth oil; the bearing life is greatly shortened; therefore, a unique heat treatment process is required; There are compressive stress; the degree of sensitivity of the falling raceway to the particulate impurities; the number of bearing life is improved. According to the working condition of the bearing; the bearing layout is re-optimized and depicted; the bearing processing method is improved; and the bearing index is further improved.
1.4 Generator bearing generator bearings use cylindrical roller bearings and deep groove ball bearings. After the layout of these two bearings, the improvement of processing methods, the cleanliness of the production process and the associated components to reduce the bearing oscillation Noise; makes the bearing have outstanding low noise function.
1.5 Bearing installation experimental skills The practical function after the bearing device is not only related to the function of the bearing itself; but also closely related to the detailed application conditions of the bearing; thus; the cooperation mode of the bearing device and the centering of the device Conduct research; make the bearing can get better working function in practice.
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Source: Bearing network time: 2017-10-29