TL elastic sleeve pin coupling transmission and core technology

　　TL elastic sleeve pin coupling transmission stress analysis The determination of large torque should consider the addition or subtraction torque and overload torque required for machine braking.However, when the design data is insufficient, the analysis is difficult, and the large torque is difficult to determine, it can be selected according to the calculated torque.That is, the calculated torque does not exceed the allowable torque value.Calculate the torque Tc with the following formula
　　Tc=KTT=9550*Pw/nT=7020*Ph/n
　　Where T-theoretical torque (Nm)
　　K-Select the coefficient related to the coupling.Refer to JB/T7511-94 "Calculation of Mechanical Coupling Selection"
　　PW-driving power (KW) PH-driving power (horsepower)
　　n-speed (rpm) TL elastic sleeve pin coupling has a relatively simple structure, easy to manufacture, no lubrication, no need to bond with metal vulcanization, easy to change the elastic sleeve, no need to move the half coupling, with compensation for the relative deviation of the two shafts Shift and damping buffer performance.The work of the elastic sleeve is compressed and deformed. Because the thickness of the elastic sleeve is thin, the volume is small, and the elastic deformation is limited, the elastic sleeve pin coupling can compensate the axis displacement and elasticity, but the allowable compensation amount for the axis displacement is less. The elasticity is weak.The elastic sleeve pin coupling relies on the locking force of the pin group to generate the frictional moment on the contact surface, and compress the rubber elastic sleeve to transmit the torque.It is suitable for small and medium-power shafting transmissions with good rigidity of the installation base, high centering accuracy, low impact load, and low vibration reduction requirements.
　　Basic type, the brake wheel and half coupling are made into an integral structure.The brake wheel half coupling is made of cast steel ZG45Ⅱ or forged steel, and its outer surface is quenched.
　　The core guide of the elastic sleeve pin coupling technology also needs to work for a long time under high temperature (400～565℃) and high pressure (90Pa) steam medium.Therefore, in addition to mechanical properties at room temperature, rotor steel also requires good high-temperature properties.At present, the chemical composition of steel used in rotors of large generators.Basically, nickel-chromium-molybdenum-vanadium series are used.When the nickel content of the steel is higher than 3.0%, the core of the rotor with a diameter of more than 1m also has good hardenability, and a lower bainite structure with good strength and toughness can be obtained.Since the rubber block in the coupling will be elastically deformed when the torque is transmitted, it can automatically adjust the coaxiality between the motor shaft and the worm shaft within the range, so it allows a large concentricity during installation (tolerance 0.1 mm), which is convenient for installation and maintenance. At the same time, the elastic sleeve pin coupling has the effect of slowing down the vibration in the transmission.Currently, the commonly used method is to use the highest possible carbon equivalent under the premise of achieving higher strength.The increase in carbon equivalent can greatly improve the casting performance of gray cast iron, reduce shrinkage cavities and porosity, and reduce the rate of casting rejects.The LJ465Q crankcase produced by our factory is a typical thin-walled part, the wall thickness is 315-4mm, and the carbon equivalent is controlled at 410%-411%.At the same time, in view of the core role of carbon in chemical composition, referring to the previously produced 276Q and 376Q crankcases, the carbon content is 313% to 314%, and the silicon content is 210% to 211%. control.So far, 13 castings have been produced. The tensile strength of the castings can reach more than 250MPa, and the hardness can reach 190～240HBS, which meets the technical requirements of the product.