Optimization Of Key Mechanism And Fluid Analysis Of The Small Chinese Medicine Decocting And Pelletizing Machine

With the increasing demand of Chinese medicine pills,mechanical pills has become the main way to make the pills of traditional Chinese medicine.The existing pill making machine can only realize the function of pellet making,but can not realize the decocting of Chinese medicine and the mixing of powder.Aiming at the problem of single function and low efficiency of the existing pellet making machinery,a multifunctional automatic small Chinese medicine decocting and pelletizing machine was designed,and the structure was optimized to improve the preparation efficiency of the traditional Chinese medicine pill.The main reaserch content of this paper is as follows:The whole small traditional Chinese medicine decocting and pelletizing machine was optimized.First,the whole machine system and three-dimensional model were established.The key components that were prone to fail were detected by experiment,and a reasonable improvement plan for extrusion mechanism and guide bar mechanism was put forward.Based on the theory of human engineering,the structure of the whole machine was adjusted.On this basis,a multi degree of freedom transport device was set up to improve the automation of the pellet making machine.The heat dissipation process of high temperature decocting liquid was simulated and analyzed.First,a mathematical model was set up based on the theory of convection heat transfer.Four Simulation schemes were proposed to solve the problem of long cycle of pellet making by slow heat dissipation of the decocting liquid of traditional Chinese medicine.On the basis of the theoretical model,two fluid finite element models of the decocting room were set up respectively,and the convection heat dissipation process of the high temperature decocting liquid was simulated.The optimization scheme was obtained by analyzing the variation of the flow field and temperature field in different heat dissipation modes and the temperature drop of the monitoring point in the decocting liquid.The process of material extrusion was simulated and analyzed.First,through the analysis of the force of the material in the extruder,the motion law of the material in the extruder was obtained.Based on the basic theory of rheology,simulation of the internal fluid finite element model of different scheme extrusion mechanism was carried out.The influence of different die models on the rheological parameters of the material during the stable pressing process was studied.The main factors affecting the volume flow rate of the extruder were obtained and the optimization scheme was determined.The working performance of extrusion mechanism and rubbing ball mechanism was tested through experiments,and the extrusion speed and output of different viscosity materials were measured,and the simulation results of extrusion process were verified.The theoretical matching speed of rubbing roller and different material extrusion speed was calculated,and pellet quality was verified under the speed.The optimal design of small Chinese medicine decocting and pelletizing machine was finally completed.This paper had completed the overall design and optimization analysis of The Small Chinese medicine decocting and pelletizing machine,providing a theoretical reference for the research and development of integrated technology and intellectualization of Chinese medicine making machine,and had practical application value.