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Performance characteristics and design methods of diaphragm coupling

Publication time: November 2016, 11【L Small

  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. They are widely used in shaft transmissions 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 power machinery transmissions High-speed, high-power mechanical transmission systems of systems, tracked vehicles, and generator sets have been commonly applied to high-speed transmission shafts after being dynamically balanced.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.

  1Select standard diaphragm coupling.When choosing a diaphragm coupling, designers should first choose among the standard, mechanical industry standards, and patented diaphragm couplings. Only the existing standard diaphragm couplings and patented diaphragm couplings It is necessary to design the diaphragm coupling by yourself when the design needs cannot be met.

  2. Torque calculation of single diaphragm coupling

  The power of the power machine in the transmission system should be greater than the power required by the work machine.According to the power and speed of the power machine, the theoretical short moment T of the high-speed end connected to the power machine can be calculated; according to the working condition coefficient K and other related coefficients, the calculated torque Tc of the diaphragm coupling can be calculated.The diaphragm coupling T is inversely proportional to n, so the low-speed end T is greater than the high-speed end T.

  3. Select the type of diaphragm coupling and the type of coupling

  Understand the comprehensive functions of diaphragm couplings (especially flexible diaphragm couplings) in the transmission system. From the overall design of the transmission system, select the varieties and types of diaphragm couplings.The type of diaphragm coupling is selected according to comprehensive factors such as prime mover category and working load category, working speed, transmission accuracy, two-axis offset, temperature, humidity, and working environment.Select the structure of the diaphragm coupling according to the needs of the supporting host. When the diaphragm coupling is used in conjunction with the brake, the diaphragm coupling with brake wheel or brake disc should be selected; when overload protection is required, Diaphragm coupling should be selected; flange type should be selected when connecting with flange; for long-distance transmission, when the axial size of the connection is large, it is appropriate to choose the intermediate shaft type or the intermediate sleeve type.

  4. Primary selection of single diaphragm coupling model

  According to the calculated torque Tc, an approximate nominal torque Tn can be selected from the standard series, which should be satisfied when selecting the model.The model (specification) of the diaphragm coupling is preliminarily selected, and the allowable speed of the diaphragm coupling [n] and the large radial dimension D and the axial dimension L0 can be found from the standard to meet the requirements of the diaphragm coupling speed .

  5. Adjust the model according to the shaft diameter

  The preliminarily selected coupling dimensions of the diaphragm coupling, namely the shaft hole diameter d and the shaft hole length L, should meet the requirements of the shaft diameter of the driving and driven ends, otherwise the specifications of the diaphragm coupling should be adjusted according to the shaft diameter d .It is a common phenomenon that the shaft diameters of the main and driven ends are different. When the torque and speed are the same, and the shaft diameters of the main and driven ends are different, the diaphragm coupling model should be selected according to the large shaft diameter.In the newly designed transmission system, the seven shaft hole types in accordance with GB/T3852 should be selected, and the J1 shaft hole type is recommended to improve versatility and interchangeability. The length of the shaft hole is in accordance with the product standard of the diaphragm coupling. Provisions.

  6. Choose the connection type

  The choice of the connection type of the diaphragm coupling depends on the connection type of the main and driven ends to the shaft. Generally, a key connection is adopted, which is a unified key connection type and code. There are seven keyway types specified in GB/T3852, four without For couplings, A-type keys are more commonly used.

  7. Select the type, type and specification (model) of the diaphragm coupling

  According to comprehensive factors such as power machine and diaphragm coupling load category, speed, working environment, etc., select the type of diaphragm coupling; select the type of diaphragm coupling according to factors such as the matching and connection of the diaphragm coupling; The specification (model) is selected according to the nominal torque, shaft hole diameter and shaft hole length.In order to ensure the strength of the shaft and the key, after selecting the diaphragm coupling model (specification), the strength of the shaft and the key should be checked, and then the diaphragm coupling model should be determined.

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