Flange issue related to the extreme deviation of the mixer shaft
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I would like to ask the experts: For the mixer of the DJ900, it has a flange connection in the middle, is equipped with four blades in a single layer, uses inclined-blade design, is made of 304 material, and its motor power is 7.5 kW. 1. The shaft hole is specified to have the H8 precision grade; what should be the precision grade for the shaft itself? Can I choose f7 or g7? 2. Do both the flange edge and the shaft edge need to be chamfered? Will it cause an imbalance? 3. If the shaft material is 45# steel, what materials should be used for the shaft sleeves, flanges, and blades? 4. How is the keyway length determined? Are there any specific requirements regarding the length-to-width ratio?
How can chamfering cause imbalance?
Update: It should be considered that the flange and shaft must maintain coaxiality; both the fit tolerance between the flange and shaft and the fit tolerance between the sleeve and shaft are H8/f7. I’m not sure if it’s possible
Is my question too simple? Is there anyone expert who can take a look? Thank you
The material for the flange is Q345R; flange connections are generally welded to the shaft. The material for the impeller can also be Q345R. The upper bearing housing is made of cast steel, while the sleeve at the bottom of the shaft that is welded to the support frame is made of Q235A. Polytetrafluoroethylene is used as the material between the sleeve and the shaft. An accuracy grade of 8 is sufficient for the shaft
Of course, the material selection depends on the medium; for some stainless steel mixing tanks, all internal components including the shaft must be made of stainless steel
Thank you for your help; the other two mixers are all made of stainless steel.
The container used with this mixer is made of Q235B; for the mixer shaft, I am considering using 45# steel, but I haven’t found any standards specifying requirements for 45# steel, such as what treatment is necessary if the thickness exceeds a certain level. Do you mean that the flange can be made of steel plate instead of forgings? For example, can 20II be used? The sleeve dimensions are 140x140x140 mm, which is quite thick; what material would be suitable for use? Are any special treatments required? Could you please take a look at it for me? Thank you so much