Calculation method and selection criteria for torque of rigid flange coupling

　　The power of the power machine in the rigid flange coupling coupling transmission system should be greater than the power required by the component machine.

　　The selection of the coupling depends on the main form of the coupling, that is, the end shaft coupling.The key connection is generally used, which is the same key connection type and code name.In gb/, seven types and four keyless connections are defined. Type A keys are more commonly used.

　　Selected varieties, models, specifications (models)

　　According to comprehensive factors such as power machinery and coupling load type, speed, working environment, etc., choose the type of coupling; choose the type of coupling according to the matching and connection conditions of the coupling; choose according to the rated torque and the diameter of S Specification (model).The length of the shaft hole and the shaft hole.In order to ensure the strength of the shaft and the key, after selecting the type (specification) of the coupling, the strength of the shaft and the key should be checked to finally determine the type of the coupling.

　　Torque calculation

　　In the coupled drive system, the power of the power device should be greater than the power required by the workpiece device.According to the power and speed of the power machine, the high-speed real short moment t connected to the power machine can be calculated.According to the working coefficient k and other correlation coefficients, the coupled torque tc is calculated.The coupling t is inversely proportional to n, so the low-speed end t is greater than the high-speed end t.

　　Primary model

　　According to the calculated torque Tc, the nominal torque TN that can be selected from the standard series should satisfy TN≥Tc.The type (specification) of the coupling is initially selected, and the allowable speed [n], radial dimension D and axial dimension L_0 of the coupling are found from the standard, which meets the requirements of the coupling speed n≤[n] .

　　Adjust model

　　The connection size of the coupling, that is, the length of the shaft hole diameter d and the length of the shaft hole L, should meet the requirements of the shaft diameter of the main shaft and the drive end.In addition, the specifications of the coupling should be adjusted according to the shaft diameter d. The main and drive end shaft diameters are common phenomena. When the torque and speed are the same, and the main shaft and drive end shaft diameters are different, the coupling type should be selected according to the large shaft diameter. .In the newly designed transmission system, 7 kinds of shaft holes that meet the requirements of the national standard should be selected, and the J1 type wellbore is recommended to improve and improve the transmission efficiency.The length of the shaft hole should meet the coupling product standard.

　　Rigid flange coupling is a simple coupling.It is mainly composed of two half couplings and connecting bolts.The main processing procedures of rigid flange couplings include: drilling the coupling sleeve hole before assembly, cutting and repairing the keyway, processing the end face of the coupling and other surfaces, etc. The half coupling sleeve hole has a taper Hole and cylindrical hole.There are more tapered holes than cylindrical holes.Process characteristics have many advantages.The tapered sleeve hole is easy to obtain the concentricity between the matching parts.The coupling is in contact with the mating surface of the shaft to achieve a better fit and easier inspection.Therefore, the use of conical holes is more common.Semi-couplings are usually made of forgings, leaving a margin of 2-3 mm on each side during rough machining, and the residual stress can only be eliminated by heat treatment.Due to the high degree of machining of the coupling sleeve hole, it is usually bored on a lathe, so it is usually finished by grinding.The finish machining of the outer surface of the coupling is carried out in the same fixture for drilling.The size of the machined hole and the contact between the hole and the shaft mating surface need to be checked.For mass-produced couplings, generally tapered sample columns can be used to ensure the interchangeability of parts.The coupling produced by a single unit can be installed on the shaft end for inspection.If the fit between the shaft and the hole does not meet the requirements, the coupling hole can be trimmed.

　　After passing the test, the coupled key channel can be processed.The processing is carried out on the insertion machine.A residue of 0.1 mm should be left on both sides of the joint for post-clamp correction.This mainly ensures that the processed key groove wall can be parallel to the center line of the hole.For mass production of connectors, special templates are usually used as the standard, and special templates are used for testing.The single-piece coupler can be used for side assembly and side scraping to achieve accurate dimensions.

　　The end face of the coupling is usually processed on the shaft, so that the tenon on the end face of the coupling is precisely concentric with the center line of the shaft.During this processing, special care should be taken that the end face of the coupling is perpendicular to the rotor shaft, and attention should be paid to whether the mating of the tenon meets the requirements.For flange couplings without tenon, the two half couplings should be sleeved together for reaming after drilling.

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