Coupling disassembly

The reverse of the ball screw disassembly and assembly, the purpose of the two is different. The assembly process is assembled according to assembly requirements. What about the coupling? Demolition is generally due to the failure of the equipment or its own maintenance needs to disassemble the coupling into components. The degree of demolition is generally based on the inspection requirements, and some only require the two shafts of the joint to be disengaged, and some must not only decompose the coupling but also remove the hub from the shaft. There are many kinds of couplings, their structures are different, and the disassembly process of couplings is also different. Here we mainly introduce some issues that need attention in the disassembly work of couplings.

Because the coupling itself needs to be disassembled, the coupling must first be carefully checked (especially for couplings that are already damaged) and the cause of the failure should be identified.

Before the coupling is disassembled, some marks should be made for the positions of the coupling components to be used as a reference for reassembly. Couplings for high-speed machines, whose coupling bolts have been weighed, must be clearly marked and cannot be mistaken.

When removing the coupling, the coupling bolts are generally removed. Because the surface of the thread deposits a layer of grease, corrosion products and other deposits, the bolt is not easy to remove, especially for bolts with serious corrosion, it is very difficult to disassemble. The removal of the coupling bolts must be done by selecting the right tool, since the external hexagonal or hexagonal sockets of the bolts have been damaged by slippage and the disassembly will be more difficult. For bolts that have been rusted or have more grease, often use a solvent (such as loose rust) to spray bolts and nut joints, allowing the solvent to penetrate into the threads, which will be easy to disassemble. If you can not remove the bolt, you can use heating method, heating temperature is generally controlled below 200 °C. By heating, the clearance between the nut and the bolt is increased, and the rusted material is also easily dropped, making it easier to disassemble the bolt. If the above method is not available, only the bolt is broken, the bolt is cut or drilled, and the new bolt is replaced at the time of assembly. The new bolts must be the same as the ones used in the original bolts. They must be weighed so that the new bolts are the same weight as the bolts on the same set of flanges.

During the disassembly of the coupling, the most difficult task is to remove the hub from the shaft. For the hub with a key connection, a tripod puller or a four-legged puller is generally used for disassembly. The selected puller should match the overall dimensions of the hub, and the right-angle hook of each leg of the puller should be properly combined with the rear side of the hub. It will not be slippery when forced. This method is only used for the disassembly of the hub with relatively small interference. For the hub with relatively large interference, the heating method is often used or the hydraulic jack is disassembled simultaneously.

Cleaning, cleaning and quality assessment of all parts of the coupling are an extremely important task after the coupling is dismantled. The assessment of parts and components refers to the comparison of the current conditions of the dimensions, shapes and material properties of each component with the quality standards determined by the design of the components after the operation of each component, and to determine which components can continue to be used and which components should be used. Used after repair, which parts are parts that should be retired