Horizontal bearing unit installation and scraping tile to tile temperature effect

Horizontal bearing unit installation and scraping tile to tile the influence of temperature - 2018 11 - 04 Han Kun peng ( Hexigten hydropower development company) Bearing installation and scraping tile to tile temperature influence is fundamental, it is an experience of high technical, but in general, the following technical requirements will play a crucial role. 1, the influence of the pendulum degrees generally we require swing of generating units are controlled within 5 wire. Degree of horizontal pendulum of the unit are so, generally in the connection flywheel would produce the generator shaft and the turbine shaft concentricity error, namely two axis is not in the same line, connection in all directions when the nut looseness, the connecting flange surface cleanliness and other factors will affect the degree of size. Between all the guide bearing, the greater the pendulum will have a huge additional force of pendulum, the bearing radial oscillator is intensified, which seriously affect the temperature. Installation can adopt the method of flange surface extraction and copper foil gasket adjust the spindle. When pendulum degrees data available dial indicator monitoring, monitoring should be on one side of the main shaft in the free state ( No bearing support) , monitoring location elected in shaft neck surface bright and clean. 2, thrust mirror plate and spindle vertical degree while the parameters after the factory equipment factory has already set ( Generally within two or three wire, as small as possible) , but still suggested that measure the first installation bearing, bearing was provided in our branch in case of the verticality deviation is more the result of thrust tile temperature on the high side and rework many times. 3, large bearing load bearing bearing surface area, high safety factor, due to the small force per unit area, friction force is small, of course, the friction heat is less, the oil film is easy to produce, because of the tension of oil. Of course for the unit has been designed, these things are unable to change, but we can compare the stress distribution in light of the actual situation, must consider the bearing at the same time, of course. The stand or fall of bearing static stress, the quality requirements are different. Some good units bearing stress distribution, large spindle horizontal double protection unit, it to scrape the accuracy requirement of the tile is much lower. 4, bearing load distribution and spindle levelness early horizontal unit is commonly three pivot structure, to make the three pivot scheduled according to the proportion of stress is not easy to adjust, if adjustment is not good, makes dangling individual bearing or bearing particularly big, will seriously affect the bearing bushing temperature and normal operation of the unit. Each point on the spindle levelness of data comparison can be used as a three pivot stress distribution on the basis of adjustment. Here want to consider the length of main shaft in every small and the comparison of the actual weight of the each weight concentrated positions, produce torque. These comparative data is generally a few silk/m level difference, generally no more than a dozen silk/m. To adjust to the stress of the ideal, the experience is more important. And late turbine with double protection more big spindle structure, its stress distribution, the unit is simple to install, scraping tile technical requirements are slightly lower. Five parameters of bearing, bearing installation and installation process is complicated, at the start of the loft, looking for work, constantly adjust, though numerous these basic work is very important, because it can directly affect the size and installation quality fine adjustment after the workload, which affect the bearing operating temperature. Installation parameters is very important in the bearing clearance, horizontal guide bearing on tile gap is generally the size of the main shaft of 0. About 2%. Unit, for example, the main shaft is 200 mm, the guide bearing on tile gap we usually choose less than 40 wire is greater than 25 wire. The gap is too large, will make the bearing radial free space is too large, also can destroy the oil film, the gap is too small, of course, makes the bottom of the oil film are susceptible to squeeze, is unfavorable to the bearing operation. 6, tile horizontal scraper guide bearing bearing, scraping the last line of have to lace, lace exquisite oil, namely in the direction of the edition ( From the feed side pick to the oil side, then pick out the feed side deep wide, shallow pointed out oil side type of melon seeds, thus is advantageous to the oil in and out, the storage) 。