Flexible coupling classification and serpentine spring coupling structure composition

XNUMX. There are two categories of flexible couplings:

(1) Spiral groove type: Spiral groove type elastic coupling has a continuous multi-turn long slot. This type of coupling has particularly excellent elasticity and small bearing load.It can withstand various deviations and is more suitable for correcting deflection angle and axial deviation, but its ability to deal with eccentricity is relatively poor. Because the spiral groove needs to be bent in two different directions at the same time, a large internal pressure will be generated, thus Lead to premature damage to the coupling.Although the long spiral groove coupling can easily bend under various deviations, it has the same effect on the rigidity of the coupling under the torsional load.Excessive swing clearance under torsional load will affect the accuracy of the coupling and weaken its overall performance.The spiral groove type elastic coupling is a more economical choice, suitable for low torque applications, especially in the connection of encoders and other lighter instruments.

(2) Parallel groove type: Parallel groove type elastic coupling usually has 3-5 grooves to cope with the problem of low torque rigidity.Parallel grooves take into account that the cut grooves can be shortened without reducing the ability to withstand deviations. The short cut grooves can increase the torque rigidity of the coupling and overlap, so that it can withstand considerable torque.This performance makes it suitable for light load applications.For example, the connection of a servo motor and a ball screw.However, this kind of performance will increase the bearing load as the slot size increases, but in most cases, it can adequately protect the bearing.Increasing size means increasing the ability to withstand eccentricity.

XNUMX. Briefly describe the alignment method of the elastic coupling:

(1) Fix the inner feet of the coupling and move the outer feet to make the eccentricity of the two center lines zero.

(2) Fix the outer foot on the side of the motor of the lifting accessories coupling, and move the inner foot until the eccentric line between the motor and the pump center is zero.In order to ensure that the motor does not move arbitrarily, after fixing the feet of one side of the motor, the other side should be supported by the top wire.

(3) After the above two methods are repeated several times, the coupling can be in a good centering state.

In addition to the stainless steel elastic coupling, it 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 by increased mass and inertia to a corresponding extent.Sometimes the backside influence will outweigh its advantages, so users have to look for other types of couplings.After the elastic diaphragm of the diaphragm coupling of the main reducer of the central transmission tube mill is broken, it is necessary to observe and analyze the scene in detail to find out the failure situation and keep the required inspection records.Jaeger contacted the manufacturer, signed an ordering contract for parts, analyzed the cause of the failure carefully and carefully, and worked out a practical and feasible solution based on the actual situation.The main points of the measures to deal with the fracture of the elastic diaphragm are: record in detail the installation position and sequence of the connecting bolts and other accessories; after the diaphragm coupling is disassembled, use the bracket to support the transmission shaft, keep it in a horizontal state, and prevent the elastic diaphragm and the connecting ring from being damaged. Force deformation; take reasonable measures to connect the wind deflector and the transmission pipe, remove the gaps, and prevent the wind carrying a large amount of dust and water vapor from entering the cavity between the wind deflector and the elastic diaphragm and corroding the elastic diaphragm; measurement and calibration For the center line of the tube mill and the main reducer, when the tube mill is running normally, try to make the transmission connection center of the tube mill and the output shaft of the reducer lie on the same straight line, and make the end face of the transmission connection flange on the vertical plane; Hinge the connecting bolt holes and bolts of the elastic diaphragm and the drive shaft; correct the concentricity of the elastic diaphragm with the transmission tube of the tube mill and the output shaft of the reducer; adjust the thickness of the adjustment gasket reasonably to avoid the elastic diaphragm from bearing the axial force .In short, after the elastic diaphragm is broken, the cause of the failure must be found at first. Taking into account the reasons of equipment, tools, experience and technology, try to ask the manufacturer to send or come to guide the maintenance to determine the quality, save time, and reduce loss.

The serpentine spring coupling is mainly made of cast special steel.There are many kinds of alloy cast steels refined to meet special needs, usually containing one or more high amount of alloying elements to obtain certain special properties.For example, high manganese steel with XNUMX% manganese is resistant to impact and wear, and is mostly used for parts of mining machinery and construction machinery; various stainless steels with chromium or chromium-nickel as the main alloying elements are used in corrosion or XNUMX Parts that work under high temperature conditions of about ten degrees Celsius, such as chemical valve bodies, pumps, containers, or steam turbine shells for large-capacity power stations.The balance level of any coupling component is determined according to the root-sum-square value of the larger possible value of the eccentricity of the center of gravity between the main axis of inertia of the coupling and the axis of rotation.Its imbalance is expressed in microns.The potential unbalance factors of the coupling components have been introduced above, and the various steps of determining the balance level of various types of coupling components and calculating the balance are shown in the calculation examples.

XNUMX. Whether the unbalance of the coupling can meet the needs of any type of rotating system depends on the performance of various special connected machines, and is better determined by the manufacturer of the connected machines.

XNUMX. The coupling chooser should choose the appropriate balance level of the coupling, the rigidity of the bearing, bearing seat, and base: For rotating parts, the mechanical transmission system has a flexible base or bracket, which is more important for the unbalanced state of the coupling. sensitive.

The serpentine spring coupling is a relatively new shaft coupling transmission component in today's mechanical field, and it is also a particularly versatile shaft coupling transmission component.The main structure of the serpentine spring coupling is composed of two half couplings, two half outer covers, two sealing rings and a serpentine spring sheet.It transfers torque by embedding the serpentine spring into the tooth grooves of the two coupling halves, and the coupling uses serpentine springs to be embedded in the tooth grooves of the two coupling halves to realize the link between the driving shaft and the driven shaft.During operation, the driven end is driven by the axial force of the active end tooth facing the snake spring to transmit torque, which largely avoids the resonance phenomenon, and the elastic variable generated by the reed when the torque is transmitted , So that the mechanical system can obtain a good damping effect.