The main characteristics of diaphragm coupling

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 very delicate and can be easily damaged if it is misused in use or not installed correctly.Therefore, it is very necessary to ensure that 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. You have to consider what type of coupling to choose in the design stage.Compared with the gear coupling, the diaphragm coupling has no relative sliding, no lubrication, sealing, no noise, basically no maintenance, easy to manufacture, and can partially replace the gear coupling.

 

The most important characteristics of diaphragm couplings;

 

1. The ability to compensate for the misalignment of the two axes is strong. Compared with the gear coupling, the angular displacement can be doubled, the reaction force is small during radial displacement, the flexibility is large, and certain axial, radial and angular directions are allowed Displacement.

 

2. It has obvious shock absorption, no noise and no wear.

 

3. It is suitable for working in high temperature and harsh environment, and can operate safely under shock and vibration conditions.

 

4. High transmission efficiency, up to 99.86%.Especially suitable for medium, high speed and high power transmission.

 

5. Simple structure, light weight, small size, convenient assembly and disassembly. Fans, compressors, hydraulic machinery, petroleum machinery, printing machinery, textile machinery, chemical machinery, mining machinery, metallurgical machinery, aviation (helicopter), high-speed power of ships Transmission systems, steam turbines, piston-type power mechanical transmission systems, tracked vehicles, and high-speed and high-power mechanical transmission systems of generator sets are commonly used in high-speed transmission shafts after dynamic balance. The diaphragm coupling consists of at least one diaphragm. It consists of a piece and two bushings.

 

1. The diaphragm is fastened to the shaft sleeve with a pin and generally will not loosen or cause backlash between the diaphragm and the shaft sleeve.Some manufacturers provide two diaphragms, and others provide three diaphragms, with one or two rigid elements in the middle, and the two sides are connected to the shaft sleeve.

 

2. The characteristic of 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 a deviation of up to 1 degrees, and at the same time produce a lower bearing load in the servo system.

 

3. Diaphragm couplings are often used in servo systems. Diaphragms have good torque rigidity, but are slightly inferior to rigid couplings. 

 

4. On the other hand, the diaphragm coupling is very delicate, and it can be easily damaged if it is misused or not installed correctly during use.Therefore, it is very necessary to ensure that the deviation is within the tolerance range of the normal operation of the coupling.

 

5. Adjust the model according to the shaft diameter: the initially selected coupling size of the bearing coupling, that is, the shaft hole diameter d and the shaft hole length L, should meet the requirements of the main and driven end shaft diameters, otherwise they must be adjusted according to the shaft diameter d The specifications of the coupling.

 

It is a common phenomenon that the shaft diameters of the driving and driven ends are different. When the torque and speed are the same, and the shaft diameters of the driving and driven ends are different, the coupling model should be selected according to the larger shaft diameter.In the newly designed transmission system, seven shaft hole types that meet the requirements should be selected, and J1 shaft hole type is recommended to improve versatility and interchangeability. The shaft hole length is in accordance with the i-bearing coupling product standard.Widely used in shaft transmission of various mechanical devices, such as water pumps (especially high-power, chemical pumps), fans, compressors, hydraulic machinery, petroleum machinery, printing machinery, textile machinery, chemical machinery, mining machinery, metallurgical machinery, Aviation (helicopters), naval high-speed power transmission systems, steam turbines, piston-type power mechanical transmission systems, crawler vehicles, and high-speed, high-power mechanical transmission systems of generator sets are commonly used in high-speed transmission shaft systems after dynamic balance .

 

Coupling is a mechanical part used to connect two shafts (driving shaft and driven shaft) in different mechanisms so that they can rotate together to transmit torque.In high-speed and heavy-duty power transmission, some sandwich couplings also have the function of buffering, damping and improving the dynamic performance of the shafting.The coupling is composed 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; today, I will talk about the maintenance of the diaphragm coupling.

 

The peripheral speed of the diaphragm coupling is about 30m/s. It is lubricated with grease. The amount is to fill the coupling. The grease change cycle is 1000 hours, and the sealing requirements are not strict.

 

The peripheral speed of the diaphragm coupling is about 30m/s. It is lubricated with grease. The open area of ​​the middle sliding block is filled with grease. The grease change cycle is 1000 hours. Ball bearing grease is suitable for use.The peripheral speed is about 30m/s, and it is lubricated with N220 gear oil. The open area of ​​the middle sliding block is filled with oil. The oil change cycle is 1000 hours, and sometimes a felt pad filled with oil is used.

 

The peripheral speed of the diaphragm coupling is about 150m/s. It is lubricated with N150 and N220 gear oils. It requires sufficient flow to pass through the coupling continuously in the axial direction without sealing.

 

The peripheral speed of the diaphragm coupling is about 60m/s. It is lubricated with No. 2 or No. 3 grease. The amount is to fill the coupling. The grease change cycle is 12 months. The sealing requirements are not strict; the peripheral speed is about 150m/s. Lubrication with N150, N220 gear oil requires sufficient flow to continuously pass through the coupling in the axial direction.