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Tips for disassembling plum coupling

Publication time: November 2016, 03【L Small

  It is recommended to remove the connecting bolts first when disassembling the plum blossom coupling.Because a layer of grease, corrosion products and other deposits are deposited on the surface of the thread, the bolt is not easy to disassemble, especially for the heavily corroded bolt, it is very difficult to disassemble.For the removal of connecting bolts, choose appropriate tools, because the bearing surface of the bolt's outer hexagon or inner hexagon has been slipped and damaged, and the disassembly will be more difficult.For bolts that have been rusted or have a lot of grease, solvents (such as rust loosening agent) are often used to spray the joints of the bolts and nuts to allow the solvent to penetrate into the threads, which will be easy to disassemble.If the bolts cannot be removed, the heating method can be used, and the heating temperature is generally controlled below 200°C.By heating, the gap between the nut and the bolt is enlarged, the rust is also easy to fall off, and the bolt disassembly becomes easier.If none of the above methods work, only damage the bolts, cut or drill the bolts, and replace them with new bolts when assembling.The new bolts have the same specifications as the original bolts. The new bolts used for high-speed equipment couplings are also weighed so that the new bolts have the same weight as the connecting bolts on the same set of flanges.Due to the failure of the plum blossom coupling itself, it needs to be disassembled. First, the entire coupling must be carefully inspected (especially for the damaged coupling), and the cause of the failure should be found out.

  Before disassembling the plum blossom coupling, make some marks on the coordinated positions of the various parts of the coupling for reference when reassembling.For couplings used in high-speed machines, the connecting bolts have been weighed and marked clearly and cannot be mistaken.

  Cleaning, cleaning and quality assessment of all parts of the plum blossom coupling is an important task after the coupling is disassembled.The evaluation of components refers to comparing the existing conditions of the size, shape, and material properties of each component with the quality standards determined by the component design to determine which components can continue to be used and which components should be used. After repairing, which parts belong to the parts that should be scrapped and updated.

  In the process of disassembly of the plum coupling, the difficult task is to remove the hub from the shaft.For the hub of the coupling, a three-legged puller or a four-legged puller is generally used for disassembly.The selected puller should match the outer dimensions of the hub, and the right-angle hooks of each leg of the puller should be properly combined with the rear side of the hub, so that the imagination of slippage will not occur when exerting force.This method is only used for disassembly of hubs with relatively small interference. For hubs with relatively large interference, heating methods are often used or combined with hydraulic jacks for disassembly.

Keywords of this article:Plum coupling | Plum coupling manufacturers |