| Tillage machines of paddy fields in agricultural machinery market at present aresimple in structure, single in function, low in efficiency, and often with damage andother problems. Therefore, development of multi-function tracked self-propelledtillage machine is vital important to change the backward situation of paddy soilpreparation and rice field transportation, to improve the level of agriculturalmechanization, and to increase the efficiency agricultural production.In the current field of agricultural machinery design, products are designed byCAD modeling software, and then put directly into production, so the productsdesigned lack corresponding assess of intensity, rigidity and reliability. Thus, potentialquality problems often exist in them. Therefore, analysis of intensity, rigidity andreliability in the design stage is very necessary.The thesis, based on the project---a new type of practical multi-function trackedself-propelled tillage machine---in Changchun Great agricultural equipmenttechnology Co., LTD., completes the research on the following aspects respectively:(1) The thesis generalizes domestic development status of self-propelled tillagemachines, summarizes the development status of tracked vehicle and the applicationof walking crawler structure in agricultural machinery and introduces the applicationof Finite Element Method in the field of agricultural machinery.(2) The thesis confirms the structural designing scheme of the multi-functiontracked self-propelled tillage machine, conducts lectotype design of the engine of theself-propelled tillage machine and the transmission and axle, accomplishes the designof transmission system, the frame of the loop wheel machine, caterpillar track,hydraulic cylinder and other key parts, carries out the project design and reliabilityanalysis of belt pulleys, chainwheels, and chains at different levels in the transmissionsystem and the input shaft and the output shaft of the operation device gearbox usingInventor software. Meanwhile, the thesis conducts lectotype design of other relevantstructures, and fulfills dynamic property analysis of the multi-function trackedself-propelled tillage machine.(3) The thesis establishes finite-element model of the frame of the multi-functiontracked self-propelled tillage machine using HyperMesh software, confirms the threetypical operating conditions of multi-function tracked self-propelled tillage machine:rotary tillage&transportation, passing the fields and ravines, and makes a linearfinite-element analysis of the frame of the machine using ANSYS software.(4) The thesis conducts an electrometric stress test on the multi-function trackedself-propelled tillage machine, and makes a comparative analysis of the result of theelectric experiment and the calculation of finite-element model, the result of whichshows that the result of the electric experiment is in good agreement with the calculation of finite-element model, and thus, testifies the relatively good accuracyand validity of finite-element computational model.(5) The thesis makes a modal analysis of the carrier of multi-function trackedself-propelled tillage machine only on rotary tillage working condition acquires thenatural frequency in restrained state of the frame of the machine, and the first10vibration characteristic of which is also analyzed.(6) Based on the fact that the multi-function tracked self-propelled tillagemachine in initial design scheme is over-weighted, the thesis carries out a light-weightdesign using APDL parametric optimization technique of ANSYS on the framestructure of the machine, the weight of the machine in the weight-lightening designscheme is reduced by21%compared to that in initial design scheme.Analysis and research of the multi-function tracked self-propelled tillage machinein the thesis provide reference for future improvement of structure design andperformance of the complete machine. The thesis is also of practical significance tomanufacture prototype more economically, shorten the development cycle, andenhance its market competitiveness. |
