Design Situation and A New Design Idea of Potato Digging Shovel
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To design a new digging shovel of tomato harvester with high performance, this paper summarizes the types of potato digging shovel at home and abroad, analyzes the structure and characteristics of various digging shovels, outlines some of the basic design methods and related theory, and discusses the existing problems of them.On this basis, this paper proposes a new bi onic design plan and a new parameter design theory, and gives specific ideas so as to provide direction for following digging shovel design, which is of great significance in improving the design of the potato digging shovel and in optimizing the tuber crops harvest soil dynamics analysis method.Keywords:
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Through comparing and analyzing the existing digging shovel of cassava machinery, and based on the physical characteristics of soil, cassava tuber and the standard factors of the traction power, a triangular convex shovel was designed. Shovel blade angle is 106°, blade width is 100cm, shovel face tilt angle is 25°, the terminal height of shove is 20cm, shovel length is 30cm and of finger-like extension of the parameters (length is 250cm, diameter is 12mm, intervals is 10mm). By calculating the digging force of triangular shovel shows that the digging force does not exceed 6500N.
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We design a zheergen cropper with walking tractor in the requirement of harvesting zheergen.The most important design is vibration digging shovel and vibrating screen.At present,the general digging shovel in agricultural machinery is stationary one.But along with the advance of agricultural machinery,there appears the vibration digging shovel.Compared with stationary digging shovel,the vibration digging shovel has its advantages:reduction of power consumption and increase of ground breaking.In most cases,agricultural machinery,in simple and compact structure,can be used to harvest crops in soil,combined with vibration digging shovel and vibrating screen.
Digging
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Tractor
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Introduced concrete parameter that fit for shovel of tuber digger in different area and different working condition, discussed the influence that different parameter produced on potato digger, established main technical parameter of digging shovel.
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By comparing analysis, the framework of digging parts of peanut combine harvester has been decided. Based on the condition that digging shovel is competent for producing requirements, formulas for the principal parameters of digging shovel have been driven out theoretically. The test results show the digging shovel is credible with satisfactory performance.
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In order to reduce the high resistance problem during peanut digging shovel operation and improve the soil loosening effect, a bionic peanut digging shovel was designed according to the streamlined profile of the head of the golden cicada, and the range of values of the digging operation parameters was analyzed. A discrete element model was developed to verify that the operational resistance of the bionic excavation shovel is lower than that of the flat shovel. The reliability of the simulation test was confirmed by conducting a resistance test on the excavation shovel through a soil trench test. A three-factor, three-water orthogonal combination test was designed to determine the optimal operating parameters of the excavation shovel: the bevel angle of the shovel blade was 55°, the digging depth was 130 mm, and the width of the shovel face was 309 mm. The paper can provide a reference for designing and optimizing peanut-digging shovels.
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A three-dimensional solid model of long rhizomatic Chinese medicinal plants digging shovel was built by Pro/E,and the ANSYS11.0 software was used to do the static analysis and modal analysis.Strain scatter gram and vibration mode were obtained,which provided a reference for the optimal design of digging shovel.
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Vibration digging shovel is a key component of agricultural implement using to harvesting the deep-root Chinese medicine. In order to provide the effective structural size parameters for the design of vibration digging shovel of agricultural implement, the whole structure of vibration shovel digging is analyzed in depth, and the movement relations between amplitude adjustment mechanism and digging shovel and its models are established. In ADAMS, adopting the design method of parameterized design point, the kinematics simulation model of vibration digging shovel is created, and the main parameters affecting the performance of harvester are respectively analyzed by simulation model, such as eccentricity, angle of entering soil and forward speed of harvester. These works has provided technical support for the design and development of vibration digging machinery.
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In order to improve the working performance of cassava harvester, structural bionic design for its digging shovel was conducted. Taking the oriental mole cricket's paws as bionic prototype, a new structural bionic design method for digging shovel was established, which considers the morphology-configuration-function coupling bionic. A comprehensive performance comparison method was proposed, which is used to select the bionic design schemes. The proposed bionic design method was used to improve digging shovel structure of a digging-pulling style cassava harvester, and nine bionic-type digging shovels were obtained with considering the impact of soil mechanics. After conducting mechanical properties comparative analysis for bionic-type digging shovels, the bionic design rules were summed up, and the optimal design scheme of digging shovel was obtained through combining the proposed comprehensive performance comparison method with Analytic Hierarchy Process (AHP). Studies have shown that bionic design method not only can improve the overall mechanical properties of digging shovel, but also can help to improve the harvesting effect of cassava harvester, which provides a new idea for crops harvesting machinery's structural optimization design.
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Bionics
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In order to improve the working performance of cassava harvester, structural bionic design for its digging shovel was conducted. Taking the oriental mole cricket's paws as bionic prototype, a new structural bionic design method for digging shovel was established, which considers the morphology-configuration-function coupling bionic. A comprehensive performance comparison method was proposed, which is used to select the bionic design schemes. The proposed bionic design method was used to improve digging shovel structure of a digging-pulling style cassava harvester, and nine bionic-type digging shovels were obtained with considering the impact of soil mechanics. After conducting mechanical properties comparative analysis for bionic-type digging shovels, the bionic design rules were summed up, and the optimal design scheme of digging shovel was obtained through combining the proposed comprehensive performance comparison method with Analytic Hierarchy Process (AHP). Studies have shown that bionic design method not only can improve the overall mechanical properties of digging shovel, but also can help to improve the harvesting effect of cassava harvester, which provides a new idea for crops harvesting machinery's structural optimization design.
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