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    The composition of the diaphragm coupling and the cause of damage

    Release Date: 2021-06-08 Publisher: admin

    The structure and working principle of the diaphragm coupling:

    Diaphragm coupling is mainly composed of stainless steel sheet metal (steel sheet), half coupling, intermediate sleeve, compression element, bolt, lock nut, limit washer, etc.The torque is input from the half coupling of the driving end, and the torque is transmitted to the front flexible steel plate group through the bolts arranged at intervals along the circumference, and then the flexible steel plate group is transmitted to the middle sleeve through the bolts, and is also deflected by the other rear end. The output of the flexible steel sheet group, bolts and driven half coupling.The steel sheet assembly is the key component of the flexible diaphragm coupling. It is composed of a corresponding number of thin elastic stainless steel laminated, through which torque and offset from multiple directions are transmitted.The thickness of the steel sheet is generally selected according to the size of the torque and the different working conditions, generally 0.35 ~ 1.20mm, and its shapes include ring type, connecting rod type, waist type and so on.

    The diaphragm is fastened to the shaft sleeve with a pin and generally does not loosen or cause backlash between the diaphragm and the shaft sleeve.Some manufacturers provide two diaphragms, and some provide three diaphragms, with one or two rigid elements in the middle, and the two sides are connected to the shaft sleeve.The difference between the single diaphragm coupling and the double diaphragm coupling is the ability to handle various deviations. In view of the complex bending of the diaphragm, the single diaphragm coupling is not suitable for eccentricity.The double diaphragm coupling can bend in different directions at the same time to compensate for eccentricity.

    Generally, there are several reasons for the damage of the diaphragm coupling:

    XNUMX. Human error: Including improper model selection, substandard machining accuracy, poor installation alignment, and poor maintenance.

    XNUMX. Damage caused by environmental factors: for example, discharge corrosion caused by electric induction of drum-shaped gear coupling, corrosion caused by acid and alkali gases, corrosion caused by deterioration of lubricating oil, etc.The discharge energy of this capacitive discharge is much larger than that of corona discharge, and it develops into spark discharge in severe cases.The spark discharge temperature can be as high as several hundred degrees Celsius.Similarly, the ozone generated by the ionization of the air, the nitrogen in the air, and the moisture produce a chemical effect, which corrodes the surface of the wire rod and the iron core.If the electric corrosion is mild, the anti-corona layer of the wire rod and the main insulation surface will become white and have different degrees of cannibalization; in the serious case, the anti-corona layer will be damaged, and the main insulation will be exposed or pitted, which will cause the anti-corona layer and even the main insulation of the wire rod. Burning of the mat.This kind of damage to the anti-corona layer of the wire rod, the main insulation, the gasket, etc. is collectively referred to as electric corrosion.

    The diaphragm coupling is especially suitable for medium and high power transmission.The diaphragm coupling is simple in structure, light in weight, small in size and easy to assemble and disassemble.It can be assembled and disassembled without moving the machine (refer to the type with intermediate shaft), and no lubrication is required.

    The diaphragm coupling is adapted to work in high temperature (-80+300) and harsh environments, and can operate under shock and vibration conditions.The diaphragm coupling can compensate for the axial, radial and angular deviations between the active machine and the driven machine due to manufacturing errors, installation errors, load-bearing deformations, and the effects of temperature rise changes.The diaphragm coupling is a flexible coupling with a metal elastic element. It relies on a metal coupling diaphragm to connect the main and driven machines to transmit torque. It has the advantages of elastic vibration reduction, no noise, and no need for lubrication. It is a substitute for drums today. Ideal product for profile gear couplings and general couplings.The diaphragm coupling has obvious shock absorption, no noise and no wear.

    The characteristic of the diaphragm coupling is a bit like a bellows coupling, in fact the way the coupling transmits torque is similar.The diaphragm itself is very thin, so it is easy to bend when the relative displacement load is generated, so it can withstand up to 1.5 degrees of deviation, while generating a lower bearing load in the servo system.Diaphragm couplings are often used in servo systems. Diaphragms have good torque rigidity, but are slightly inferior to bellows couplings.On the other hand, the diaphragm coupling is delicate and easily damaged if it is misused during use or not installed correctly.Therefore, the deviation is within the tolerance range of the normal operation of the coupling.Choosing the right coupling is a key step to make good use of the coupling. In the design stage, you have to consider what type of coupling to choose.

    The diaphragm coupling has a high power-to-mass ratio, which is particularly suitable for connecting high-power power devices.It can be assembled and disassembled without interfering with the master-slave device. The coupling can be replaced within 2 hours, which improves equipment utilization.Withstand misalignment, the ability to reduce vibration and noise can meet the misalignment requirements of most power transmission devices in operation.Applying predictable low additional load to the connected device Compared with similar flexible transmission elements, the diaphragm coupling exerts a predictable small force and bending moment on the connected device.Non-linear changes in stiffness between shafts restrict the drift of the motor magnetic center.Diaphragm coupling can accurately transmit speed without slip, and can be used for mechanical transmission.

    Is there a standard value for the diaphragm thickness of the diaphragm coupling?

    In fact, there is no standard for the thickness of the diaphragm of the diaphragm coupling in the national standard. The thickness of the diaphragm is calculated by calculation, but the force of the diaphragm is more complicated, which can generally be obtained by finite element analysis.In China, the thickness of the diaphragm is rarely calculated by calculation, and it is obtained by surveying and mapping products. After the introduction of products before, there is no uniform standard gradually, and the calculation is based on the selected material.