Determining the reducer and the frame from the angle of force
The forces and moments described in the previous articles are usually borne by the bearings of the two output shafts in the reducer. For agitation with a lower rotational speed and a shorter cantilever length, the diameter of the shaft can be determined based only on the torque. If the length of the cantilever is long, the bending moment will be relatively large, and the diameter of the output shaft of the reducer and the bearing in the reducer will increase accordingly. The price of the reducer with the reinforced bearing will increase more.
May also be provided external moment that the bearing shaft is not transmitted to the gear unit, this practice is the single pivot frame, as shown in FIG. A radial bearing is installed in the frame to support the radial load of the shaft, which greatly reduces the reaction force on the reducer bearing and the bending moment acting on the output shaft of the reducer, so that it can be based only on the torque and the shaft. Determine the reducer by the thrust.
After the single-point frame is set, the distance between the frame bearing and the reducer bearing is large. It can be known from the bearing reaction formula that the large spacing can reduce the bearing load . However, the deflection between the shaft and the cantilever shaft between the bearings will increase, and the increased deflection will result in poor gear meshing, increased wear and excessive deflection of the seal leading to premature seal wear.
The bigger problem with a single-point frame is that there are three bearings on a rigid shaft. The alignment of the multi-point system is difficult. If the installation is not good, it will cause eccentricity, which will aggravate the wear and vibration of the bearing. Therefore, be careful when using a single fulcrum rack.
A more feasible way is to add a thrust bearing to become a double fulcrum frame. The axial and radial forces of the shaft are borne by the bearings on the frame, and the gearbox can be selected according to the torque. If the agitator shaft is long, the bending moment is large, or the fluid reverse thrust force is large and the pressure inside the vessel is high, if the bearing of the reducer is used to withstand the force and torque, a large-size model reducer is required. A double fulcrum rack allows for a smaller gearbox.
Another advantage of the double fulcrum frame is that the shaft of the reducer and the frame are connected by a flexible coupling, which solves the problem of poor alignment of the single fulcrum frame. However, due to the increase in the height of the frame, attention should be paid to the rigidity of the frame and the influence of the swing of the frame on the body.
Therefore, it is necessary to carefully calculate the economic comparison between the reducer and the frame, and perform detailed accounting on the bearings of the reducer. In special cases, the use of the frame is more economical. From the perspective of the adoption of foreign reducers and racks, gear reducers are used in Europe and the United States, and bearings are not installed in the racks; Japan uses gears or cycloidal reducers, and double-supported racks; Line reducer plus single fulcrum frame. In terms of rationality, the design of European and American countries is reasonable.
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