Application Research And Development Of Briquetting Machine For Understory Forage Plants In The South

With the rapid development of China’s national economy and social progress, the economics of understory industry in the south of China has been flourishing. Based on the state forestry public welfare industrial research project of "the research on key technology of understory plants in the south (No.201204160)", the forage briquetting machine was designed in this paper for the understory forage plants in the south of China in order to meet the market needs of forest-grass industry and cooperate with some large molding equipments production, also reduce the cost of forage plant long-distance transportation and collection. This briquetting machine has the advantages of lower cost, lower energy consumption and operate easily, and it is also suitable for the ordinary rural households. The main works and innovations in this paper are as follows:Firstly, the briquetting machine’s structure was calculated in detail and then the basic dimensions of some important parts were determined, the strength of the main parts were also checked. According to the expected compression ratio and productivity, the basic parameters of briquetting machine were determined. The compression chamber and other parts of the three-dimensional solid model were designed. Based on the model, the overall design scheme of the machine was ultimately determined and the first generation prototype was developed. The device has the features such as heating, temperature control, pressure alarm and so on. The initial press test showed that the briquetting machine had high productivity, low energy consumption, low noise, and many other advantages.Secondly, drawing on the domestic and foreign research results of the physical and mechanical and properties, rheological stress relaxation phenomenon, the elastic deformation in loose stage is ignored and the generalized Maxwell model is used to analyze the stage of transitional compression and packing of forage plants, then the rheological constitutive equation is obtained.Thirdly, taking sweet potato stem and teosinte of different growing periods as typical understory plants in the south of China, the initial press tests showed that: when the moisture content of forage plants were in the rate of25%and the temperature was90℃, it helps to save power and the compressed block has a more ideal effect, it could effectively reduce the energy consumption of each briquetting block required, and could prolong the service life of wearing parts briquetting machine. The molding cycle was about1min, the process of holding pressure should be controlled at about40s, which could effectively alleviate the deformation of forming block caused by the stress relaxation.Finally, the nutrient composition of the above compressed forage plants had been measured and analyzed, the results showed that:the nutrient composition of sweet potato stem were higher than teosinte, the tender young teosinte was better than the old one, the nutrient composition of understory plants and the ones planted by traditional methods were almost the same.The works in this paper have carried on the beneficial exploration for ecological civilization construction such as large area popularization of understory forage plants, the development of the other understory economical resources and soil and water conservation. Obviously, they have evident social and economic benefits and broad development and application prospect.