Removal of couplings

The process of disassembly and assembly is different for both purposes. The assembly process is to assemble the coupling according to assembly requirements so that the coupling can deliver torque safely and reliably. The disassembly is generally due to the malfunction of the equipment or the joint shaft itself needs to be repaired, and the coupling is disassembled into parts. Degree of disassembly...

Key words: disassembly of couplings

The process of disassembly and assembly is different for both purposes. The assembly process is to assemble the coupling according to assembly requirements so that the coupling can deliver torque safely and reliably. The disassembly is generally due to the malfunction of the equipment or the joint shaft itself needs to be repaired, and the coupling is disassembled into parts. The degree of disassembly is generally determined according to the requirements of maintenance, some only require the two axes of the connection to be removed, some not only to decompose the shaft, but also to remove the wheel hub from the shaft. There are many kinds of couplings, the structure is different, and the disassembly process of the coupling is different, which mainly introduces some problems that need to be paid attention to in the disassembly of the couplings.

Due to the failure of the coupling itself, it is necessary to disassemble the couplings, and to make a careful and careful examination of the coupler as a whole (especially for the coupling that has been damaged), the cause of the failure should be found.

Before the coupling is disassembled, some marks should be made for the coordination of each component of the coupling to be used as a reference for reloading. For the coupling of the high speed machine, the coupling bolt is weighed, and the mark must be clear and must not be mistaken.

Remove the coupling bolt when disassembling the coupling. Because of a layer of oil, corrosion and other sediments deposited on the thread surface, it is not easy to disassemble the bolts, especially for the corroded serious bolts, which is difficult to disassemble. The disassembly of the connecting bolt must be selected for the appropriate tool, because the force surface of the outer hexagon or inner hexagon of the bolt has been skidded and damaged, and the disassembly will be more difficult. For bolts that have been corroded or have more oil, they are often used as a solvent (such as a loose rust agent) to the joint of the bolt and nut, allowing the solvent to penetrate into the thread so that it can be easily disassembled. If you still can't put the bolt is removed, can use heating method, general control heating temperature below 200 ℃. By heating the gap between the nut and the bolt, the rust is easy to fall off, making it easier to remove the bolts. If none of the above methods can be used, only the bolt is broken, the bolts are cut off or drilled out, and the new bolts are replaced during assembly. New bolts must be in accordance with the original use of bolt specification, new replacement of coupling bolts used in high speed equipment, must also be weighed and make the new bolt and the connecting bolt at the flange on the same set of weights.

In the process of disassembly, the most difficult work is to remove the hub from the shaft. For the hub of the key connection, the general use of the three - foot rama or the four-legged rama to disassemble. The chosen rama should match the shape of the hub, the right Angle of the rama legs should be combined with the rear side of the hub, and it will not produce slippage in the force. This method is used only for the removal of the smaller wheel hub, and for the larger wheel hub, the heating method is often used, or the hydraulic jack can be disassembled at the same time.

Cleaning, cleaning and quality evaluation of all parts of the coupling is a very important work of the coupling. Parts of the assessment is to point to each parts after the operation, its size, shape, and material properties of the existing status and parts design and quality standards, to determine which parts can continue to use, which some parts should be used after repair, which belongs to spare parts should be scrapped.