Attention to the use of elastic coupling

Published: 2020-11-03

Flexible couplings are relatively used nowadays. Rigid couplings have no elastic components and do not have the function of damping and buffering. Flexible couplings are suitable for connecting two coaxial transmission shafts and can compensate for the relative deviation of the two shafts. Shock absorption, wear resistance and cushioning performance, the elastic coupling has a large structure, simple and reasonable, easy to maintain, symmetrical and interchangeable on both sides, long life, allowing large axial movement, with cushioning, shock absorption, and wear resistance And other performance.In addition to corrosion resistance, the elastic coupling also increases the torque bearing capacity and rigidity, and can even reach twice that of similar products made of aluminum alloy.However, this increased torque and rigidity will be offset to some extent by the increased mass and inertia.Sometimes the negative impact will outweigh its advantages, so users have to look for other forms of couplings.

When selecting, please note that the rated torque must be greater than the system load torque. The rated torque has taken into account the variable load factors during operation, so there is no need to adjust the rated torque value when selecting. The commonly used elastic couplings now have their own standard models.Elastic couplings are commonly used couplings in equipment. Common types of elastic couplings are divided into plum elastic couplings, elastic diaphragm couplings, star-shaped elastic couplings, and aluminum alloy elastic couplings.The elastic coupling is made of several non-metallic elastic material pins, which are placed in the flange holes of the two halves of the coupling, and the two halves of the coupling are connected by the pins. The coupling has a simple structure and is easy to manufacture. It is more convenient to assemble, disassemble and replace the elastic element without moving the two couplings.

CouplingIt is a mechanical part used to connect two shafts in different mechanisms so that they can rotate together to transmit torque. They are respectively connected with the driving shaft and the driven shaft.The manufacturing and installation errors of the coupling manufacturer, the deformation after load and the influence of temperature changes, etc., will cause the relative position of the two shafts to change, and it is often impossible to guarantee strict alignment.But there is a certain degree of relative displacement. In high-speed and heavy-duty power transmission, some couplings also have the function of buffering, damping and improving the dynamic performance of the shafting.

The performance of the coupling to adapt to a certain range of relative displacement. These displacements should be avoided during assembly, or flexible couplings should be used to compensate for these displacements. Generally, the power machine is mostly connected to the working machine by means of a coupling.The output speed of the electric motor is stable, while the output speed of the internal combustion engine fluctuates greatly.If the load of the working machine has impacts, vibrations, large changes, frequent start-ups, and reversing, flexible couplings with buffering and vibration-absorbing capabilities should be selected.Generally, if the alignment of two shafts is high and the rigidity of the shaft is high, sleeve coupling or flange coupling can be selected; if the alignment of the two shafts is difficult or the rigidity of the shaft is small, the offset of the shaft should be selected Shift the flexible coupling with compensating ability.

The coupling model is selected from the coupling standard according to the transmitted torque, shaft diameter and speed.When the two shafts have relative displacements, additional loads will be caused in the structure.Simple structure, easy manufacturing, no maintenance, low cost, etc., but it does not have compensation performance.The coupling has the ability to compensate various relative displacements between the two shafts to be connected, and is further divided into non-elastic element flexibility, which can compensate the relative displacement of the two shafts, but because there is no elastic element, it cannot buffer and reduce vibration. .The elastic element is flexible. Because of the elastic element, it can not only compensate the relative displacement between the two shafts, but also has the ability to buffer and reduce vibration.

The more energy the elastic element can store, the stronger the vibration damping ability.There are many varieties of this kind and they are widely used.It is divided into inelastic elements and elastic elements. The former has the ability to compensate the displacement of the two axial pairs. The latter has the function of buffering and damping in addition to the compensation performance. However, the ability to transmit torque is affected by elasticity. The component strength limit is generally not as good as inelastic components.In high-speed and heavy-duty power transmission, some have the function of buffering, damping and improving the dynamic performance of shafting.It consists of two halves, which are respectively connected with the driving shaft and the driven shaft.The general power machine is mostly connected with the working machine by means of a coupling.