Several factors influencing designers to choose the correct coupling (XNUMX)
Time: 2018-04-15 Browse:
The two shafts connected by the coupling produce relative displacement due to many factors such as manufacturing error, assembly error, installation error, shaft load and deformation, base deformation, bearing wear, temperature change, and relative movement between components.Under normal circumstances, the relative displacement of the two shafts is unavoidable, but the direction of the equilibrium displacement generated by the shafting transmission under different working conditions, that is, the axial, radial angular direction and the magnitude of the displacement are different.Only the flexible coupling has the performance of compensating the relative displacement of the two shafts. Therefore, a large number of flexible couplings are selected in practical applications.Rigid couplings are not compensatory and the application range is limited, so the amount is very small.Universal couplings should be used for shafting transmissions with large angular displacement; for shafting transmissions with axial movement and need to control axial displacement, diaphragm couplings should be used; only those with high alignment accuracy Rigid coupling is selected only below.
(XNUMX) Transmission accuracy of the coupling
The small torque and the transmission of the main shaft system require the coupling to have high transmission accuracy, and the flexible coupling with metal elastic elements should be used.The shafting transmission with large torque and power transmission also has requirements for transmission accuracy. At high speeds, avoid the use of flexible couplings with non-metallic elastic components and gaps between the flexible couplings and movable components. It is better to choose Diaphragm coupling with high transmission accuracy.
(XNUMX) Coupling size, installation and maintenance
The outer dimensions of the coupling, that is, the maximum radial and axial dimensions, must be within the installation space allowed by the machine and equipment.Choose a coupling that is convenient for assembly and disassembly, does not require maintenance, has a long maintenance period or is convenient for maintenance, replaces wearing parts without moving the two shafts, and is easy to adjust the coupling.
It is difficult for large machinery and equipment to adjust the alignment of the two shafts, so you should choose a coupling that is durable and easy to replace the wearing parts.Flexible couplings with metal elastic elements generally have a longer service life than flexible couplings with non-metal elastic elements.The need for sealing and lubrication and the use of non-durable couplings will inevitably increase the maintenance workload.For occasions with long-term continuous operation and high economic benefits, such as the high-increasing end of the rolling mill transmission system of my country's metallurgical enterprises, the currently commonly used upper gear couplings, although the theoretical transmission torque is large, the gear coupling must Durable work can only be done under the conditions of good lubrication and sealing, and the sealing condition needs to be checked frequently, lubricating oil, maintenance workload is large, auxiliary working hours are increased, effective working time is reduced, and production efficiency is affected.
(XNUMX) Working environment
The coupling functions as a complete set of various host products, and the surrounding working environment is more complicated.For the working environment with high temperature, low temperature, oil, acid and alkali medium, it is not suitable to choose flexible couplings with general rubber as the elastic element material, but should choose flexible couplings with metal elastic elements.The elastic pin gear coupling has high noise due to the movement of the pin during operation. It should not be used in occasions with strict requirements for noise.
(XNUMX) Manufacturing, installation, maintenance and cost of couplings
Under the premise of meeting the convenience of use, couplings that are convenient for assembly and disassembly, simple for maintenance, and low cost should be selected.For example, the rigid coupling is not only simple in structure, but also easy to assemble and disassemble, and can be used for low-speed, high-rigidity drive shafts.General non-metallic elastic element couplings (such as elastic sleeve pin couplings, elastic pin couplings, plum-shaped elastic couplings, etc.), due to their good comprehensive capabilities, are widely used in general small and medium-sized Power transmission.
