The development and error problem of plum-shaped elastic coupling

　　Plum-shaped elastic couplings are widely used in metallurgy, petroleum, chemical industry, and cranes due to their small radial size, small moment of inertia, no gap, vibration reduction, good effect, strong axial, radial and angular compensation capabilities, etc. And other industries, and are widely used in metallurgy, petroleum, chemical, lifting and other industries.Especially with frequent starting, positive and negative high-speed operating conditions. Although the elasticity of the plum blossom has good compensation capabilities, it still produces additional forces and torques on the rotor and bearing systems, and these additional forces often bring serious consequences.

　　With the progress of science and technology, the rotor system is gradually developing in the direction of high speed and heavy load.People have realized the seriousness of coupling misalignment.Many scholars have carried out related theoretical and experimental research, but mainly focused on the drum teeth.The misalignment of couplings and diaphragm couplings and plum blossom elastic couplings is rarely seen in various documents.

　　The radial position difference and the angular error are two aspects of the coaxiality of the two connecting shafts.In the process of coupling assembly, the control of radial position difference and angular error is a very difficult point.This is also an important aspect that affects mechanical operation.For the quincunx elastic coupling, the allowable range of radial position difference and angular error is related to the aperture size of the coupling.The standard CB/T 5272 has detailed regulations on it.The assembly accuracy of the coupling is an effective way to improve the flatness accuracy of the assembly surface of the motor and reducer connected with the coupling.In addition, the center of the output shaft of the motor and the input shaft of the reducer can be determined by measurement, which can greatly improve the assembly efficiency.

　　Radial deviation and angular error will directly affect the stability of the transmission. The radial deviation and angular error exceed the standard, and the rotation coupling will have obvious abnormal reactions. First, the coupled rotation can be found with the naked eye. Second, the sound of mechanical rotation can be Hear a significant increase. , Use a vibrometer to measure the fixed part of the output end of the motor or the input end of the reducer, you can measure the vibration speed and vibration displacement, and find that it is much larger than normal operation.

　　The influence of large radial position difference and angular error is not only reflected in the frequent damage of the elastic parts of the plum blossom elastic coupling, but more importantly, it seriously affects the service life of the motor and the reducer.In this case, the motor bearings are susceptible to heat and wear, which seriously affects the service life of the motor and the reducer.Even the input seal ring of the harm motor from the coil reducer is easily damaged, causing oil leakage at the shaft end. Of course, excessive vibration can also cause varying degrees of damage to the bearings and gears.

　　There are three types of coupling: parallel coupling, angular coupling and composite coupling.This article theoretically discusses the parallelism of plum blossom elastic coupling.

　　The quincunx elastic coupling transmits torque mainly through the engagement of the convex teeth of the two half couplings and the quincunx-shaped elastic body.There is no gap between the convex teeth and the elastic body.When the axes of the two rotors are relatively offset, the elastic element deforms accordingly and plays a role of automatic compensation.

　　The protective device of the plum blossom flexible coupling is usually provided by the buyer.Therefore, this part of the content is not a requirement for coupling.The buyer or contractor shall specify the type of protection device required.Each coupling should be equipped with a protection device to seal the coupling and the shaft to prevent people or objects from entering the hazardous area when the unit is running.The protection device should be easy to disassemble, so that the coupling will not affect the connected machine during inspection and maintenance.The structure of the protective device must have sufficient rigidity, and when bearing a static load of 900N, its deflection shall not exceed 0.0005 times the unsupported length of the protective device.The protection device of the coupling to be lubricated should be sealed.When necessary, the protection device should be equipped with anti-moving baffle to reduce the influence of gas or oil.Cylindrical shell protection device with flange connection is usually used for medium and high speed gear couplings and diaphragm couplings.The structural cylinder of the protection device is planed along the axial direction, and the protection device is connected with the corresponding equipment in the device through the flanges at both ends.There should be an expansion joint at one end of the protection device, and an O-ring should be installed at the expansion joint.If the coupling is working under corrosive conditions and needs protection, the protection device should be installed with pipe joints to allow access to dry air or inert gas.A protection device for continuous lubrication of the controller.Each nozzle should be fastened to the protection device in the proper direction to spray oil in the direction of rotation.If the unit runs forwards and backwards, oil is injected along the axial direction.The nozzle or oil pipe is not allowed to rub against the coupling.

　　The content of the coupling is described above. After reading it, do you understand? Please pay attention to our website.You can get more information about the associated shafts.