Optimization Of A Combined Machine For Subsoiling And Land Preparation

Subsoiling can break the hard plow sole of the soil, and build deficiency-and-excess soilstructure. It can make the water, air and heat in the soil more changeable, speed of plants’growth, improve the soil physically and avoid the environmental impacts like sand-dustweather. The combined machine will press the soil as few as possible and improve productiveefficiency. It is the progressive direction of plowing. Recently agricultural machinery field islacking in combined operation machines, so the paper designed a new type of combinedmachine whose aim is subsoiling and land preparation. The performance and reliability of thenew machine can be improved by means of finite element analysis and structure optimization.A parametric system for subsoiler is designed whose aim is to quicken the design ofsubsoilers. The main tasks and conclusions of the paper are listed as follows:(1) By comparing several programs, the complete application and parts programs of thecombined machine for subsoiling and land preparation are fixed. The arrangement form of thesubsoiler is3in row one and2in row two. The cambered share shaft and replaceable shareare employed for the subsoiler. And rake knife roller is employed for the land preparationmachine. The paper made three-dimension model of every part and also to assemble modelwith CATIA.(2) The subsoiler is analyzed of stress in the ideal condition. And the result is that thestress of share shaft is2048N and of share is3305N. The paper analyzed finite element staticforce of the share shaft、the share and the stander based on the result of the stress analysis. Itworked out that the maximal displacement of share is3.898mm and of double-wing share is0.04694mm and of the stander is2.278mm.And their maximal Von Mises stress are274MPa,272MPa,226MPa.These numbers are all less than the allowed stress, but they still need to beoptimized.(3) The paper put forward a final optimized program of the share shaft and the standerwhich is based on the result of finite element analysis: lessening the fixed bolt hole of theshare shaft to protect it from overloading; increasing strength of the inclined straining beam todecrease the maximal stress of rack and decreasing the thickness of rack ripe wall to decreasethe weight of the stander. A new fixed equipment of subsoiler is designed aimed to change theweakness and unadjustable penetrating angle of share. It can provide an overload protection of share shaft and a changeable penetrating angle with a safety bolt a regulate screw.(4) Based on the CAA Automation, the paper developed a subsoiler parametric designsystem by means of secondary development of CATIA. Users can choose the type ofsubsoiling shaft and share, and change parameters through man-machine interaction interface.The system can build automatic assembly and generate the engineering drawing of subsoilershare on basis of three-dimensional model.This paper whose target is a combined machine for subsoiling and land preparationfinished the systematized design of complete machine and parts model selection,3Dmodeling and assemblage, stress analysis, finite element analysis, structure optimization andparametric design, combined with experience design and modern design methods. The paperprovides the combined machine for subsoiling and land preparation with theoreticalfoundation and puts forward solution to existing problems of subsoilers at present. Theparametric design system quickens the design and decreases the cost of subsoiler design.