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How to disassemble the coupling

2019-12-16 14: 55: 23 Views


      The process of disassembly and assembly is the opposite, and the purpose of the two is different.The assembly process is to assemble the coupling according to the assembly requirements, so that the coupling can safely and reliably transmit torque.Disassembly is generally due to equipment failure or the coupling itself needs to be repaired, and the coupling is disassembled into parts.The degree of disassembly is generally determined according to the maintenance requirements. Some only require the two shafts to be disconnected, and some require not only the disassembly of the coupling, but also the removal of the hub from the shaft.There are many types of couplings, their structures are different, and the disassembly process of the coupling is also different. This section mainly introduces some problems that need to be paid attention to in the disassembly of the coupling.
      Because the coupling itself needs to be disassembled due to the failure of the coupling, the entire coupling must be carefully and carefully inspected (especially for the damaged coupling), and the cause of the failure should be found out.
      Before disassembling the coupling, it is necessary to make some marks for the coordinated positions of the various parts of the coupling for reference when reassembling.For couplings used in high-speed machines, the connecting bolts must be weighed, and the markings must be clear and cannot be mistaken.
      When disassembling the coupling, generally disassemble the connecting bolt first.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.The disassembly of connecting bolts must be done with suitable 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 with a lot of grease stains, solvents (such as rust loosening agents) are often used to spray the joints between the bolts and the nuts, so that the solvent can penetrate into the threads, so that it 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 must be consistent with the original bolt specifications. The newly replaced bolts used for high-speed equipment couplings must also be weighed so that the new bolts have the same weight as the connecting bolts on the same set of flanges.
      In the process of coupling disassembly, the most 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 foot of the puller should be properly combined with the rear side of the hub, so that no slippage will occur when you apply 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 at the same time with hydraulic jacks for disassembly.
      Cleaning, cleaning and quality assessment of all parts of the coupling is an extremely 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.

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