Design And Simulation Analysis Of Key Parts Of Cassava Stalk Harvesting And Crushing Machine

Cassava is native to the Americas and is now widely cultivated throughout the world.According to the China Tropical Agriculture Information Network reported that in 2015 China's southern cassava planting area of about 830 thousand hectares, the total value of its underground tuber harvest close to 10.36 tons. According to the data, the ratio of the total weight of the cassava tuber and the ground stem to two is close to 0.8. That is to say,before harvesting the tubers, one must first dispose of the stalks on the ground. The total amount of ground stem is not a small number, its annual output of about 8.74 tons. But China's cassava production mechanization level is only 1.9%, development is very slow;and the growth of cassava geographical conditions and agronomic higher popularity is not the limiting factor, which makes the research of mechanized harvesting technology cassava stalk is basically in the blank stage.In recent years, with the development and utilization of the multiple development trend of continuous adjustment of China's tropical agricultural production structure and green plant stalk, stalk resources in the development and production of processing, more and more attention; at the same time, for the mushroom cultivation technology of biomass energy, the research is also in progress. This makes the research and development of cassava stalk shredder, became a top priority.In order to realize the cassava stalk at harvest can knead hammer crushing and collecting stem storage, design principle and practical experience we can learn from the corn stalk harvester, sugarcane harvester, cotton stalk harvester, grass silage harvesting machine, grinder and other mature high thick stalk machine, the design concept of a combined type pulverizer of cassava stalk harvest in theory, make improvement and reasonable design of stalk harvesting and crushing, extrusion parts system and its key segments, so as to achieve the integration of technology and innovative ideas.According to the green ecological agriculture production concept, with scientific and reasonable multivariate innovation, depth development of new biomass energy research objectives, in accordance with the requirements of agricultural machinery and equipment research and development technology, realize the transformation of cassava stalk medium science ideas and energy into macro fungi biomass economy strategy, combined with the physiological characteristics of cassava and agronomic requirements, design scheme of combined type cassava stalk harvesting and crushing machine. The key system and function structure of the machine include: the harvester, the central processing, the conveying system, the smashing system and so on. When cassava plants entered the cutter cut in Taichung grain pressing roller under the help of the grain pressing roller below the disc cutting cutter will be cut off at the root of the plant; the harvested stem from the feeding roller to eat into the central processing and conveying system, after extrusion rolling will stem tissue rupture, reduce its toughness and hardness. The cutter is used to cut the stalks according to a certain length, and then the stems are stirred up to be assembled into the crushing device under the action of the elevator. The cassava stalk harvester can be used to complete the process of harvesting, extruding, cutting, crushing, collecting and so on.In the design of the cutting table,the technical parameters of the disc cutter are determined.The central processing and conveying system is mainly composed of the extrusion roller, the hob, the dragon and the conveying chain plate. In order to squeeze roller cassava stem tissue crushed, reduce its strength and hardness, ensure the hob work easy degree.The cutter cuts the broken stalk to further reduce the flexibility, so that the dragon is easy to collect and assemble the stem, so as to achieve the purpose of conveying.Based on the analysis of the physical properties of cassava stalks and the research and development of the stalk crushing machine, the paper puts forward a new scheme of technology integration and function fitting. The new grinding unit can be achieved on short stalks again fine cut, and installed the rubbing hammer piece and the ejection leaves in the crushing system. The hammer hit again fritters to stalk crushing section, crushing particle size requirements; at the same time,the radial case is processed on the inner wall of a series of rules twill. The twill can be finely ground to the debris to further reduce the particle size.Finally, after the completion of the mechanical design of the unit and the key parts of the main system, according to the requirements of material mechanics and mechanical design of the service life of the parts, by means of mechanical design and simulation software to make mechanical analysis of disc cutter, rubbing hammer piece two key components. Its design concept greatly reduced the later optimization work, reduced the research cost.From the design concept, the combined type of cassava stalk harvester can be completed at one time on the stem of the harvest, extrusion section pretreatment,transportation, crushing, collection and many other processes. The research scheme theoretically improve the level of mechanization harvest cassava industry, to further reduce operating costs, improve the level of comprehensive utilization of straw, and pave the way for subsequent mechanized harvesting of cassava underground tubers; the harvest cassava production throughout the lower end of operation into the full mechanical process, improve production efficiency, and has the research significance very important.