What Causes Damage to Diaphragm Couplings?

Transmission of Diaphragm Coupling

Diaphragm coupling is especially suitable for medium and high power transmission. The diaphragm coupling has the advantages of simple structure, light weight, small volume and convenient assembly and disassembly. It can be assembled and disassembled without moving the machine (referring to the type with intermediate shaft), and no lubrication is required.

The diaphragm coupling is suitable for working 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 offsets between the main motor and the driven motor due to manufacturing errors, installation errors, load-bearing deformation and the influence of temperature rise changes. Diaphragm coupling is a flexible coupling of metal elastic element. It relies on metal coupling diaphragm to connect the main and slave motors to transmit torque. It has the advantages of elastic vibration reduction, no noise and no lubrication. Ideal for gear couplings and general couplings. The diaphragm coupling has obvious shock absorption, no noise and no wear.

Diaphragm couplings are a bit like bellows couplings in that they actually transmit torque in the same way. The diaphragm itself is thin, so it flexes easily when relative displacement loads are created, so it can tolerate up to 1.5 degrees of deflection while producing low bearing loads in the servo.

Diaphragm couplings are often used in servo systems. Diaphragms have good torque rigidity, but are slightly inferior to bellows couplings. Diaphragm couplings, on the other hand, are delicate and can be easily damaged if misused in use or not installed properly. Therefore, the deviation is within the bearing range of the normal operation of the coupling. Selecting a suitable coupling is a key step in using the coupling well. In the design stage, it is necessary to consider what type of coupling to choose.

Diaphragm couplings have a high power-to-mass ratio and are especially suitable for connecting high-power power plants. It can be assembled and disassembled without disturbing the main-slave device, and the replacement of the coupling can be completed within 2 hours, which improves the utilization rate of the equipment. It can withstand misalignment, and has the ability to reduce vibration and noise. The misalignment ability can meet the misalignment requirements of most power transmission devices in operation. Predictably low additional load on connected devices compared to comparable flexible transmission elements, diaphragm couplings impose predictably small forces and bending moments on connected devices. The non-linear change of stiffness between shafts restricts the drift of the magnetic center of the motor. Diaphragm coupling can accurately transmit the speed, without slip, and can be used for mechanical transmission.

The diaphragm is pinned to the bushing generally without loosening or causing backlash between the diaphragm and bushing. Some manufacturers offer two diaphragms, while others offer three diaphragms, with one or two rigid elements in the middle, and the two sides are attached to the bushing. The difference between a single-diaphragm coupling and a double-diaphragm coupling is the ability to handle various deviations. Since it requires complex bending of the diaphragm, the single-diaphragm coupling is not suitable for eccentricity. The double-diaphragm coupling can be bent in different directions at the same time to compensate for eccentricity.

Causes of Damage to Diaphragm Couplings

1. Human error: including improper selection, substandard machining accuracy, poor installation alignment, poor maintenance, etc.
2. Damage caused by environmental factors: for example, discharge corrosion caused by induction electricity of drum gear coupling, corrosion caused by acid and alkali gas, 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. Spark discharge temperature can be as high as hundreds of thousands of degrees Celsius. Similarly, the ozone generated by the ionization of the air has a chemical effect with the nitrogen and moisture in the air, which corrodes the surface of the wire rod and the iron core. If the electrical corrosion is mild, the anti-corona layer and the main insulation surface of the wire rod will turn white and have different degrees of erosion; if the anti-corona layer is damaged in severe cases, the main insulation will be exposed or pitted, causing the anti-corona layer on the surface of the wire rod and even the main insulation. Burnout of the gasket. This kind of damage to the anti-corona layer of the wire rod, the main insulation, the gasket, etc. is collectively referred to as electro-corrosion.

Couplings and clutches are devices used to connect two shafts to rotate together and transmit torque. The main difference between them is that the two shafts connected by a coupling can be separated only by disassembling them after the machine stops running; while the two shafts connected by a clutch can be used at any time during the operation of the machine.

In practical applications, the diaphragm coupling is a transmission device that uses metal flexible elements to transmit torque without lubrication. It is widely used in ships, aviation, petrochemicals, machinery manufacturing and other areas. The flexible element is a diaphragm group formed by stacking a number of thin metal diaphragms of 0.2mm to 0.6mm. When working, the torque is input from the active flange, and the torque is transmitted to the metal diaphragm through the active torque transmission bolts arranged at intervals along the circumference, and then the diaphragm is transmitted to the driven flange through the driven bolt for output. It realizes the flexible transmission of the coupling through the elastic deformation of the alloy diaphragm group, and uses the flexibility of the diaphragm to absorb the relative displacement between the input and output shafts, thereby compensating for the residual medium caused by various factors in each connecting part of the transmission shaft system.

The main function of the diaphragm coupling is to connect two shafts (sometimes also connect the shaft and other rotating parts), so that the two shafts rotate together to transmit motion and torque, realize the connection and separation between the shaft and the shaft, so as to realize the power pass and interrupt. The diaphragm coupling also has the ability to compensate the offset of the two shafts, so as to reduce the additional load caused by the relative offset of the connected two shafts, change the transmission performance, and prolong the life of the machine. In order to reduce the vibration of the mechanical transmission system and reduce the impact peak load, the diaphragm coupling should also have good buffering and shock absorption performance.

The coupling is a component that connects the two shafts axially and transmits torque and motion, and has the ability to compensate for the offset of the two shafts. In order to reduce the vibration of the mechanical transmission system and reduce the high impact peak load, the coupling should also be used. It has excellent cushioning and shock absorption performance. Couplings sometimes also have overload protection. ATO offers single diaphragm coupling or double diaphragm coupling, and the bore size can be 4mm to 8mm, 5mm to 10mm, or 10mm to 20mm.