玉米秸稈皮瓤分離裝置的設(shè)計(jì)及其試驗(yàn)研究
[Abstract]:As an important biomass energy, corn straw is abandoned or burned without effective utilization, which not only pollutes the environment, but also wastes resources. How to make full use of corn straw resource and improve its utilization value is an urgent problem to be solved. The skin of corn straw contains more lignin and cellulose, which can be used as raw material for papermaking board, and its flesh is rich in crude protein and fat, so it can be used as raw material for high quality animal feed and wine making. In order to realize the efficient utilization of corn straw resources, it must be separated reasonably and effectively. Based on the analysis of the material characteristics of corn straw and the previous studies, a device for separating corn straw skin and pulp was designed, and the feasibility of the device was studied. The main contents and conclusions of this paper are as follows: (1) the overall design and working principle of corn straw rind and pulp separation device. The skin pulp separating device is mainly composed of feeding device and cutting device. Feeding device mainly produced compression and cutting effect on straw. Due to the difference of material characteristics of corn straw pulp during the compression process, plastic deformation of straw pulp resulted in partial separation of skin and flesh bond. In the process of cutting, when the tooth blade enters and leaves the straw, it not only destroys the binding state of the corn straw skin, but also drives the surrounding straw skin, and destroys the combination state of the straw flesh skin around the tooth blade. The separation degree of skin and flesh was further expanded. The main function of the shear device is to separate the partially separated straw evenly under the extrusion and cutting action of the fixed knife and the cutter. (2) the structural design of the feeding device and the shear device and the finite element analysis of the key parts. The structural design of feeding device mainly includes adjusting mechanism, feeding roller, tooth blade and other parts design; the structural design of shear device mainly includes blade, tool holder, cutter shaft and other parts design. Three dimensional modeling software was used to model the key parts and the strength of the key parts of feeding and shearing device was checked by ANSYS finite element analysis software. The stress distribution and deformation characteristics of the components under the ultimate load are obtained. The results show that the strength and deformation of the key parts are within a reasonable range under typical working conditions, which provides a certain theoretical basis for the manufacture of feeding and shearing devices. (3) the experiment of corn straw husk pulp separation device. Through pre-test and theoretical analysis, it can be seen that the factors such as feeding roll speed, upper and lower feeding roller tooth clearance, cutting tool speed and so on have great influence on the separation effect of corn straw pulp. The above three factors were selected as experimental factors, the separation rate and evenness were selected as the evaluation indexes, and the experimental study was carried out on the self-designed pulp and skin separator. The results show that the speed of feeding roller, tooth clearance and cutter speed have significant effects on the two evaluation indexes, among which the interaction between tooth clearance and cutter speed has a significant effect on the separation rate. The interaction of feed roll speed and cutter speed not only has a significant effect on the separation rate, but also has a significant effect on the uniformity. After optimization, the optimum parameters of the separation device were obtained as follows: when the feed roll speed was 393r / min, the tooth gap was 5.86mm, and the cutter speed was 925r/min, the separation rate was 85.71 and the uniformity was 85.31.
【學(xué)位授予單位】:沈陽農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:S226
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