Rice is a basic food crop, and its production and processing have always been valued by our country. The rice mill, as a processing equipment for rice, plays an important role in improving the utilization rate of grain. In the main shaft system of the rice mill, 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 speed increases, making the rate of rice broken Increased, bearing life reduced.
In order to solve the problem of broken rice rate, the finite element method was used for static analysis and modal analysis of the vertical rice mill. The researchers obtained some enlightening 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 pick roller are installed on the main shaft, the frequency has changed.
The above problems belong to the field of rotor dynamics in mechanics. But in rotor dynamics, in order to solve this kind of problem, the structure is often simplified, and then the corresponding formula is derived. These formulas have a directional effect, but for a complex rotor system such as a rice mill, its theory is difficult to use. At this time, the use of numerical calculation methods, such as the finite element method for rotor system dynamic analysis has become an effective way. According to the rotor dynamics theory, when the working speed of the rotor system changes, its critical speed will also change accordingly. Due to the complicated structure of the main shaft system, the finite element method was used to analyze it, and the critical speed of the main shaft of the rice mill under different speeds was investigated, so as to provide a method for its calculation, so as to provide a reference for the calculation of the critical speed of similar rotor systems.
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