Test Studies And Design On Cutting Mechanism Of Grafting Machine

At present, with the development of Chinese economic and rural reform, many large and middle scale plants invested much are set up step by step, as well as a lot of small plants with plastic shed or greenhouse. At the same time, after the China' s access to WTO, our traditional grafting technology is facing tremendous inevitable challenges because of the internal and international agricultural competition, the way applying auto-mechanism to graft which appears recently as a hi-tech in the world integrate machine, auto-control technology with horticultural technology. This way makes the cutting parts of scion and rootstock together in extreme short time, sharply increasing the grafting speed and the survival rate, productivity as well as decreasing labor intensity, which is called revolutionary in grafting domain. So, the successful study of auto- grafting mechanism has great influence on Chinese economic and becomes very important to scholar study. The cutting mechanism, the key of auto grafting mechanism, is the beginning study of the machine. The designing of the cutting mechanism has immediate influence on efficiency, the survival rate and the quality of auto grafting mechanism. This study is also vital.Now, the author take young peach plants as objects of grafting test, creating the new field of fruit tree grafting with auto-grafting mechanism. On the base of tests, this paper discusses theoretically and analyses practically including the following parts by test: Choosing the project of auto grafting; studying and designing crushing resistance device and test, designing and theoretical analysis of the cutting mechanism, setting up mathematics model to optimize the parameters of the half-rotation cutting mechanism with MATLAB6.5 language; studying on secant and smooth cutting, single-sustained cutting and double-sustained cutting, finding the relation between cutting and fiber orientation of young plants. Creating analog cutting device to test and performing orthogonal test analysis, the author figures out best combination of the cutting force and the rate of the successful cutting with SPSS and checks the conclusion with regression equation. Finally, the author calculates the impetus of the half-rotation cutting device.Basing on the careful study, this paper draws many conclusions: grafting with auto-mechanismadopts sticking grafting, the mathematic model: f( ,R,B,D) = R2+B2(i-cos( /2)) and the optimizedparameters is x = [0.9983 3001.510]. this mechanism adopts smooth cutting and the maximal of crushing resistance force-F is equal tol.OkgF; adopting new type grasping device .The regression equation about cutting force and the rate of the successful cutting are y=-0. 305-0. 016x1+0. 965x2-0. 03x3 ; Y=81. 986+0. 544x1-11. 176x2+0. 589x3 respectively, x1,x2,x3 is the rotate speed, the diameter of the young tree, the angle of cutting respectively, which are remarkable by the signature . At last, comprehensively design the half-rotation cutting structure, choice the dynamic machine and cam.