發(fā)布時間：2018-06-05 01:14

  本文選題：大豆耕播機 + 耕作部件��； 參考：《吉林大學》2017年碩士論文

【摘要】：耕播聯(lián)合作業(yè)機組一次下地能完成耕整地和播種等多項作業(yè),能高效地完成農(nóng)作物的種植,因此,大豆耕播機是實現(xiàn)大豆種植機械化最重要的機具之一。大豆耕播機機組完成耕地、整地和播種等作業(yè)機械的任務,需要連續(xù)地與田間土壤接觸進行作業(yè),這對大豆耕播機觸土部件的工作性能具有很高的要求。本文對大豆耕播機觸土部件中的耕作和鎮(zhèn)壓關鍵部件做了相關研究,主要研究了大豆耕播機耕作部件減阻耐磨耦合仿生表面結構的制備方法及其作業(yè)阻力參數(shù)的測試,以及大豆耕播機鎮(zhèn)壓裝置鎮(zhèn)壓力參數(shù)的測試。針對耕作部件既要提高耐磨性又要保證強度存在矛盾、以及耕作阻力大的問題,本文提出了一種通過構建仿生表面結構和控制工藝(設置冷鐵)來設計結構/材料二元耦合仿生表面結構的方法。運用此方法采用球墨鑄鐵材料進行砂型鑄造制備試樣,并進行了相關試驗。微觀組織分析表明:單純通過構建仿生表面結構或局部設置小型冷鐵的方法,試樣表面結構局部均未能形成白口鐵組織,而上述兩種方法的結合運用,可耦合實現(xiàn)球墨鑄鐵試樣仿生表面結構的白口化。顯微硬度和劃痕試驗表明:耦合仿生表面結構具有較高的局部硬度,相比于芯部基體,其顯微硬度值平均提高了35.71%,而形成相同寬度的劃痕時,其所需載荷是芯部基體的1.16倍。磨料磨損試驗結果表明:構建仿生表面結構和設置冷鐵試樣的磨損量均小于無結構無冷鐵試樣,構建仿生表面結構且設置冷鐵試樣的磨損量最小。各試驗結果說明耦合仿生表面結構具備了內(nèi)部球墨鑄鐵韌性好、外部表面白口組織硬度高的特點,從而兼顧部件的耐磨性和機械性能。水潤濕性試驗結果表明:耦合仿生表面結構處水接觸角高于芯部組織的水接觸角,其接觸角增大了14.91%,更大的接觸角有利于降低土壤粘附,表面水接觸角的梯度分布有利于實現(xiàn)粘附土壤脫附。磨料磨損試驗中受力分析表明:仿生表面結構對樣品的切向力有較大的影響,構建仿生表面結構的試樣切向受力最小。各試驗結果說明耦合仿生表面結構具有一定的減阻效果。運用結構和材料二元耦合仿生設計的方法,加工制備了具有仿生表面結構的耦合仿生雙翼型深松鏟尖。針對耕作部件(如深松鏟、起壟鏟等)田間作業(yè)時阻力采集困難和相關阻力測試裝置結構復雜、維護使用成本高、缺乏過載保護等問題,設計了一種耕作部件作業(yè)阻力測試裝置(TRTD),并以雙翼型深松鏟為例,建立了包含修正系數(shù)k與扭簧轉角θ、耕深H、耕速V、土壤容積密度ρ、深松鏟結構參數(shù)等換算關系的耕作阻力測試方法,與傳統(tǒng)三點式作業(yè)阻力測試系統(tǒng)(TTD)在6組耕作條件下進行了土槽對比試驗。精度分析結果表明TRTD相比于TTD的最大相對誤差為1.34%,波動性分析結果表明TRTD與TTD的波動幅值比較接近,兩者最大相對偏差不超過5%。采用本文設計的阻力測試裝置對比分析了本文設計的仿生雙翼型深松鏟尖和傳統(tǒng)雙翼型深松鏟尖的水平耕作阻力,試驗結果表明,仿生雙翼型深松鏟尖一定程度上減小了深松鏟的耕作阻力。本文提出了一種基于仿形彈性鎮(zhèn)壓輥的鎮(zhèn)壓力測試方法,采用等效土壤堅實度的方法,建立了適應于播種表土層(0-100 mm)的鎮(zhèn)壓輥偏心量-等效土壤堅實度-鎮(zhèn)壓力的數(shù)學關系模型。土槽驗證試驗結果表明,采用鎮(zhèn)壓輥鎮(zhèn)壓力測試方法測量得的土壤堅實度與人工實地測量的土壤堅實度比較貼合,且在3種不同的含水量條件下都比較適用�；诶碚摲治龊屯敛墼囼�,進行了田間綜合試驗:1)利用耕作阻力測試裝置對深松鏟尖進行耕作阻力田間試驗,對兩種類型的深松鏟尖進行了阻力對比分析。2)進行鎮(zhèn)壓力田間試驗,考察基于彈性鎮(zhèn)壓輥的鎮(zhèn)壓力測試方法的田間工作效果。
[Abstract]:The ploughing and sowing unit can complete the ploughing and sowing and so on at one time, and can efficiently complete the planting of the crops. Therefore, the soybean ploughing and seeding machine is one of the most important machines to realize the mechanization of soybean planting. In this paper, the key parts of the tillage and repression in the soil parts of the soybean ploughing and sowing machine are studied in this paper. The preparation methods and the resistance parameters of the coupling bionic surface structure of the resistance and wear resistance of the tillage parts of the soybean ploughing sowing machine are mainly studied in this paper. The test, as well as the test of the pressure parameters of the town pressing device of the soybean ploughing machine. In view of the problems of improving the wearability and the strength of the tillage, and the large resistance to the tillage, a bionic structure / material two element coupling surface structure is designed by the construction of a bionic surface structure and a control process (setting cold iron). Using this method, the spheroidal graphite cast iron material was used to make sand mold preparation samples and the related tests were carried out. The microstructure analysis showed that the surface structure of the sample was not formed by the method of constructing the bionic surface structure or the local setting of the small cold iron, and the combination of the above two methods could be used. The microhardness and scratch test show that the coupling bionic surface structure has high local hardness, and the microhardness value of the coupled bionic surface structure is higher than that of the core substrate by 35.71%, while the load required for the same width is 1.16 times that of the core matrix. The results show that the wear amount of the bionic surface structure and the set of cold iron specimen is less than that of the non structure non cold iron specimen. The structure of the bionic surface structure and the wear quantity of the cold iron specimen are the smallest. The results show that the coupling bionic surface structure has the characteristics of good toughness of the inner ductile iron and the high hardness of the white surface on the external surface. The water wettability test results show that the water contact angle of the coupled biomimetic surface structure is higher than the water contact angle of the core, and the contact angle increases by 14.91%. The larger contact angle is beneficial to the reduction of soil adhesion, and the gradient distribution of the surface water contact angle is beneficial to the desorption of soil adhesion. The stress analysis in the loss test shows that the bionic surface structure has a great influence on the tangential force of the sample, and the specimen with the bionic surface structure has the smallest shear stress. The results show that the coupling bionic surface structure has a certain drag reduction effect. The bionic table is prepared by the method of two element coupling bionic design of the structure and material. In the field of farming parts (such as deep loosening shovel, ridging shovel, etc.), the resistance acquisition difficulty and the related resistance testing device are complex, the maintenance cost is high, and the overload protection is short of overload protection. A kind of TRTD is designed, and the double wing type deep loosening shovel is designed. For example, the method of resistance testing is established, which includes the correction coefficient K and the torsion spring angle theta, the ploughing depth H, the tillage speed V, the soil volume density p, the deep loosing shovel structure parameters and so on, and the traditional three point resistance test system (TTD) has carried out the soil grooves comparison test under the 6 groups of tillage conditions. The accuracy analysis results show that the TRTD is the largest compared to the TTD. The relative error is 1.34%. The fluctuation analysis shows that the fluctuation amplitude of TRTD and TTD is close, and the maximum relative deviation is not more than 5%.. The resistance testing device designed in this paper is used to compare and analyze the horizontal tillage resistance of the bionic double wing spade tip and the traditional double wing type deep loosening shovel. A deep loosening shovel tip reduces the tillage resistance of the deep loosening shovel to a certain extent. In this paper, a new method of pressure testing based on an imitation elastic repression roll is proposed. By using the method of equivalent soil firmness, a mathematical relationship model of the eccentricity of the repression roll, which is suitable for the sowing surface layer (0-100 mm), is established. The test results show that the soil firmness measured by the repression roll town pressure test method is close to the soil firmness measured by artificial field, and is more suitable under 3 different water content conditions. Based on the theoretical analysis and soil trough test, the field fully mechanized test is carried out: 1) the use of tillage resistance testing device for deep loosening is made. The field experiment on the resistance of the shovel was carried out, and the resistance contrast analysis of two types of deep slack shovel pointed.2) was carried out in the field test of pressure in the town. The effect of the field work on the pressure test method based on the elastic pressing roll was investigated.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：S223.24

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本文編號：1979733