High-temperature steam turbine tightening bolts fa -

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High-temperature steam turbine Tighten bolts fastening, demolition and replacement

Nut. Loosen the nut after the oil pressure dropped to zero, check whether the loose nuts, if not release, repeat the above to be 24 * Chemical Construction No. 3 of 1995 operations. Loosen the nut behind the bolt to be removed from the hydraulic stretching device. Third, replacement of bolts fastening bolts fastening the long-term work in high temperature conditions, each time downtime also bear the temperature of thermal expansion and contraction stress, such as fastening bolts run time, the growth and gradual asked by the elastic deformation into plastic deformation, each bolt to allow the plastic deformation there is a certain value. Some manufacturers provided that when that bolt deformation greater than the length of a bolt or screw that defects in the work surface galling or thread,[link widoczny dla zalogowanych], or bolt hardness greater than 30HRC, they should replace the bolts. The process of replacing the bolt threads are often encountered in the demolition is not killed off. Replacement of the method is difficult to remove bolts to commonly used acetylene gas cutting and mechanical cutting two ways. 1. First start with acetylene gas cutting operations with skilled welders gas acetylene gas flame cut off the bolt. Notch higher than the surface of the body together 20 ~ 30ram, and then drill bolt holes in the remaining pore size should be smaller than the bolt diameter as 4 ~ Smm, acetylene gas flame and then the second step bolt in the hole cut in the remaining victims! = 1 to 2 out of the vertical slot, but must prevent damage to the case when gas cutting screw threads. Then tick with the flat shovel,[link widoczny dla zalogowanych], so that the remaining part of the chassis stripped out. Finally, tap the screw holes Zaigong standard system again. Acetylene cutting method with a higher risk of closure, when the cutting longitudinal groove, the control case not very easy to damage the screw thread. 2. Cut now to a mechanical fastening bolts Mgo �� 3, for example, briefly replacing spiral Gui steps: (1) cut off the Lo Kwai-use with 250 �� 2 grinding wheel and a protective cover of the electric angle grinder, posted on with the surface of the body, horizontally cut off the bolt as shown in Figure 7. - (2) mounting bracket to the three brackets (see Figure Super

, were installed in the adjacent fastening bolts at the top. Connected with the angle between the stent and fixed bracket snap together into a triangle. After alignment with the line of hammers, the underside of the beam in the upper center of the bolt at the Punch corresponding foreign red eyes, as the drilling machine positioning, cutting and feeding purposes. Home - ��. A /] dang [L_! J Figure 8 bracket (3) drilling using the pneumatic pressure is 0.7MPa drilling machine, drilling machine for variable speed, speed range 5O ~ 200 r / min. First with a tapered cobalt-65 drill hole nest in order to locate the time of drilling, and then the bolt center, cobalt 65 holes, and its depth of screw who screw shell screw hole Gui Gen degrees. 4) plane milling and reaming tool: white with a 20X20 �� 20 steel knife Arbor: Figure 9 Figure 9 reaming Arbor-r �� L �� 1995 No. 3 25 * Drilling Chemical Construction and the expansion of L, drill speed control 20 to 30 rev / min range,[link widoczny dla zalogowanych], arbor rotating the plane of longitudinal cutting feed rate is 0.3 ~ 0.5mm, reaming diameter 86.5ram. (5) Remove the remaining part of the bolt hole has been extended to the inner thread root diameter smaller than 0.1 ~ 0.2ram, then L in the wall after reaming can already see the line marks a thread in the hole top of the little one pound, can be pulled out with pliers to wire similar to a residue. (6), tapping, finishing the final standard screw thread tap system to attack a snail L. Remove the thread surface of the burr. Success rate using mechanical cutting method, but also easy to operate,[link widoczny dla zalogowanych], but should note the following three requirements; (1) expansion of the center of L must be the center of L and Lo are not eccentric (2) to extend L to control the pore size, pore size L screw too bruised over the threads when the pore size is too small residual part of the difficult to remove the bolts. (3) drilling machine must be perpendicular to the body,[link widoczny dla zalogowanych], to ensure that the hole drilled Kwai Lo is not drilled at an incline. Above the level of the construction method is also applicable to centrifugal compressors Split tightening bolts, removal and replacement. (Continued from page 19) as follows: first row of panels in the tank wall angle of the map in liters (l on the map to the wall angle) draw a family of slash, as shown in Figure 11. Then ranked according to the lines drawn on a board map in the steel plate. When the tank after tank wall memorial assembly on the formation of a set of spirals. l IV curve of the meaning of 11 in this group are: the installation of each zone plate and the other without meticulous consideration of the relative position with the board. Choose a combination of the tank after forming as a benchmark to the best lines. Discussed above, the spiral curve for the real space, which is different from some of the information in the space plane spiral similar to the arc line to handle, while extremely simple method, to avoid some cumbersome and difficult to understand graphics and computing. Is feasible in practice. -

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