Design,Simulation And Experimental Research Of Three-point Hitch Linkage For The Separated Till-planter

Accompany with the economic development in our country, agricultural mechanizationdevelopment has come to a new period. The aim is not only raising labor productivity, butalso energy conservation and cost reduction, moisture conservation, soil protection,increasing production and incomes. Jilin province is one of the most important grainproduction areas. However, Jilin black soil is decreasing seriously. It has a significant impactof drought on food production. And traditional tillage methods damage the soil structureseverely. Non-tillage with stubble can increase the organic matter content of soil and reducethe destruction of soil struction. Both till-planter and no-till planter can meet the operationalrequirements of non-tillage with stubble lands. However, not only is till-planter less, but alsono-till planter is more expensive in the current market. Therefore, it is necessary to design anew and practical linkage making the existing rotary tiller, stubble crushing machine andplanter work together. The linkage can reduce the purchase cost effectively. The mainfunctions are to ensure joint use and stand-alone operation of the two independent machine,to meet the operational requirments of till-planter on the land surface with roughness degree,to ensure the machine with three functions.The main contents of this paper are to design three-point hitch linkage, to analyzeworking principle, to simulate working process, to test in farmland and verify the operationaleffectiveness of moisture conservation.Rotary tiller module of the separated till-planter choose1GFZ-4tillage machine, sowingmodule choose2BJ-4planter. The three-point hitch linkage need to ensure the moderatedistance between the two stand–alone machines, need to have copying function, need to havesimple structure, need to ensure the effective contact between land wheel and ground and thestable depth of fertilizer opening. Dimension design of the linkage is related to the structureof the stand-alone machines. The maximum effective distance is determined by the unitlongitudinal stability reserve coefficient and climbing stability coefficient. The maximumeffective distance is40cm. The minimum effective distance is determined by the distance ofsoil throwing when rotary tillaging or stubble breaking. The minimum effective distance is19cm. It can be concluded that the lingkage ensure the stability of depth of the fertilizer opener and the effective contact between land wheel and ground by analyzing the profilingtheory of the three-point hitch linkage. The upper profiling liminted angle is4.02°. Thelower profiling limited angle is6.42°. The total profiling amount is73.4mm.Establish the ground model with different changes in slope angle after investigating thesloping land of the Northeast, which are±4°and±8°,±12°and±16°separately. Gain threestandards about evaluating the linkage by analyzing the movements of land wheel andfertilizer opener. Firstly, difference between land wheel center trajectory path in the verticaldirection and the ground undulating. Secondly, the trajectory path in the forward direction ofa point at the edge of land wheel round. Thirdly, the positional relationship betweentrajectory of the cutting-edge of fertilizer opener and upper and lower limits of fertilization.We get some conclusions by simulating with Pro/E and ADAMS. The rigid mechanism canonly ensure the separated till-planter work stably on the ground model with±4°changes inslope angle. The three-point hitch linkage can ensure the separated till-planter work stably onthe ground model with±12°changes in slope angle.According to industry standards and technical specifications of the planter, theexperiments verified the consistency of the planter fertilization and seeding depth andseeding uniformity. According to the test, the slide rate of land wheel, the depth offertilization and seeding, the qualified rate, the reseeding rate and leakage seeding ratereached industry standards.Compared with traditional cultivation, combined operation can reduce the soil moistureevaporation effectively, be favor of the conduction of water in the soil and be of great help toimprove soil moisture, water storage capacity and soil temperature. The combined operationcan provide more favorable conditions for seed germination.