The focus of the comprehensive inspection instrument to check the gears

When the two gears are meshed, if the involute curve of one gear tooth tip portion is in contact with the tooth root transition curve of the other gear, a latching phenomenon transition curve interference occurs. As shown in Fig. 1, if the lowest point of the involute of the gear 2 is KD, the radius of curvature is below the PD point, which is the transition curve. The above is the involute, which is the linear tooth profile of the rack-shaped tool during machining. vertex. When the gear 2 meshes with the gear 1, the lowest point at which the tooth top of the gear 1 and the root of the gear 2 actually mesh is K, and the radius of curvature is p. Obviously, when the K point is low, transition curve interference occurs. If the two gears are forcibly engaged, the drive will not be smooth.
Figure 1 gear meshing diagram according to the 5 machine design manual; 6 Chapter 4 / involute cylindrical gear transmission; formula given in: change the pump performance curve to adjust the working conditions; change the working speed of the pump centrifugal pump lift, The flow rate is related to the rotational speed. When n is increased, the flow head is correspondingly changed by the proportional relationship between the first and second squares, that is, the curve moves to the upper right; when n decreases, the curve moves to the lower left, such as As shown in Fig. 3, when the pipeline is not changed, different working points can be obtained to change the flow rate. Figure 3 shows that it is economical to change the speed adjustment for speed regulation because it has no additional energy loss due to throttling. However, this adjustment requires the use of a prime mover that can change the speed, such as a centrifugal pump with a constant speed adjustment of the DC motor.
In the past, when I selected the pump, there was a general selection of excessive lift and excessive flow, and some pumps 1 because of the process modification, the actual required lift and flow rate were lower than the pump rating, causing the pump not to operate in the high efficiency zone. By cutting the impeller of the pump to match the head and flow of the pump with the actual requirements, we have achieved good economic benefits; through a series of improvements, the centrifugal pump of our unit can basically operate in the high efficiency zone, saving The energy has ensured the normal production.

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