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The Metering Principle of Auger Type Powder Filling Machine
II. Simulation Results
2.1 Velocity and Pressure Fields in The Auger Groove
Through the velocity pattern of the individual material powders, the direction of the velocity of the material during the rotation of the auger can be clearly seen, which is not consistent with the velocity map of the material powders previously obtained through a purely mathematical model, which indicates that the material particles are in the process of rotation.This shows the complexity of the movement process of the materials during the rotation process. There are limitations only through mathematical analysis. Experience is also indispensable for the control of materials.
2.2 The Effect of Auger Rotating Speed on The Filling Amount
It is generally understood that the higher the auger rotating speed with the greater the filling amount. When the auger rotates at high speed, the density between the materials decreases with the increase of the shear rate. The metering accurate of the material is difficult to control, so the filling amount and the auger rotating speed are not absolutely linear.
2.3 Optimization of Auger Parameters
In actual production, the main parameters of the design auger are auger thread distance, auger thread angle, and auger thread depth (auger diameter).The auger thread distance will be pre-set according to the actual fill amount, and the main parameter affecting the auger measurement efficiency is the auger thread angle. Because the material moves downward under the forced action of the auger thread surface, the larger auger angle of the auger thread, the material fill speed larger, and the filling efficiency of the auger is correspondingly increased, but the auger thread angle cannot be increased without limit. By simulation, when the auger thread distance and the g thread depth (auger diameter) are constant, the auger thread with different angles get a better angle range of 16-25 degrees.
However, in the specific practical application, according to the different characteristics of the powders, the three parameters should be adjusted accordingly. First, one or two parameters are determined, and the other parameters are optimized to achieve the best measurement effect.
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