Stabilized soil mixer Drum cutters cut the soil from bottom to top. Since the soil cutting thickness is gradually increased from thinner, it does not cause impact on the soil in the initial stage of cutting. The rotating tool is very easy to mill through an arc length in the initial section of the soil chip, and at the same time, the soil chips that pass through are broken. When the thickness of the chip reaches a certain level, the tool begins to be subjected to a significant impact and enters the impact penetration phase.
So how to determine how the tool began to be impacted and how the angle of the beginning is the key to the problem. The difficulty of this problem is: on the one hand, the impact is a process, a process of rapid accumulation of force due to soil deformation in a very short time, so no matter how short the process is, the force is small. Large, it is difficult to accurately determine when the impact starts from the tool into the soil; on the other hand, this angle also varies for different depths of cut, different cutting speeds and soil conditions. It is gratifying to note that after a lot of experiments and comparisons, the basic trend between the cutting speed and the corner of the tool has helped to solve this problem.
A more accurate initial angle of impact is determined by computer simulation of each curve.
(1) The impact starting angle of the bending knife is fitted to the test data to obtain a regression equation with correlation coefficient r=90%: H=29.92-1.13Vp. From the above formula, the impact starting angle H and the cutting speed Vp are linear. relationship.
(2) The impact starting angle of the blade can be fitted to obtain a linear regression equation with correlation coefficient r=96%: H=30.58-1.48Vp3, the maximum cutting force PSmax of the impact cutting section can be seen from the large amount of experimental data. The maximum cutting force during the working process occurs in the range where the cutting speed Vp is about 5 m/s. When the tool cuts a certain thickness of soil in this speed range, its mechanism of action is significantly different from other cutting speed segments. Because the maximum cutting force determines the total energy consumption of the machine during the cutting work, the selection and control of it constitute an important factor affecting the performance index of the machine.
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