Study on Calculation of Critical Speed of Spindle System of Rice Mill

Rice is a basic food crop, and its production and processing have always been valued by China. Rice mills, as processing equipment for rice, play an important role in improving food utilization. In the spindle system of the rice milling machine, there are many asymmetric parts in the structure of the shaft, and there are many curved grooves on the roller, which leads to the existence of eccentric mass, which will cause severe vibration when the rotation speed increases, resulting in the broken rice rate. Increased, bearing life is reduced.
In order to solve the problem of broken rice rate, the static analysis and modal analysis of the vertical rice mill by the finite element method, the researchers got some inspiring conclusions. However, in the modal analysis, this article only considers a single spindle, and does not take into account the components on the spindle at the same time. In fact, when the roller, pulley, and roller are mounted on the spindle, the frequency has changed.

The above problems belong to the field of rotor dynamics in mechanics. However, in rotor dynamics, in order to solve such problems, the structure is often simplified, and then the corresponding formula is derived. These formulas have a directional effect until they are used, but for a complex rotor system such as a rice mill, the theory is difficult to use. At this time, the numerical analysis method, such as the finite element method, is an effective way to perform the dynamic analysis of the rotor system. According to the rotor dynamics theory, when the operating speed of the rotor system changes, its critical speed will also change. Due to the complex structure of the spindle system, the finite element method is used to analyze it, and the critical speed of the rice milling machine spindle at different speeds is investigated to provide a method for its calculation to provide a reference for the calculation of the critical speed of the rotor system.

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