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Disassembly and assembly of the coupling

by:JNSN     2021-12-20
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 transmit torque safely and reliably. 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 couplings is also different. This article mainly introduces some problems that need to be paid attention to in the work of coupling disassembly. Because the coupling gear and the vibrating shaft are tightly connected (interference fit), and the space in the flange is small, it is difficult to disassemble the coupling gear. For this reason, we have designed a special disassembly tool, which is simple, convenient and practical. If the coupling itself fails and needs to be disassembled, the entire coupling must be inspected carefully (especially for the damaged coupling), and the cause of the failure should be found out. Before disassembling the 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 are weighed, and the markings must be clear and cannot be mistaken. When removing the coupling, the connecting bolt is usually removed 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, solvents (such as rust loosening agents) 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. 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 leg 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 the 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 job after the coupling is disassembled. The evaluation of components refers to comparing the current status of each component's size, shape and material properties with the quality standards determined by the component design after operation, and determining 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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