| Fertilization is a must horticultural work procedures that can increases yield and quality. At present, it is still in manual completion in china, strength, low efficiency, and along with rising labor costs and the shortage of young labor, the demand for mechanization of fruit trees is growing more and more intense. As the reasons for orchard planting pattern, spacing of small, low branches, but more with our trencher and medium-sized tractor, this directly led to the ditching machine entrance difficulties. Development of a remote control with micro-mechanical package of ditching machine has important practical significance.A small chain trencher was been designed against the horticultural requirements for orchard fertilization, the paper's main work is as follows:1) Under the gardening requirements of fertilization, the trencher's design parameters have been ascertained. Then the operating principle of the trencher has been described. Through the Kinematics analysis of the trencher, determined its forward speed, ditching inclination; and through dynamic analysis to determine the course of the blade by cutting the soil resistance, and thus determines the total power consumption.2)Structure design of key components has been done. Drawn the Pro / e maps of the main parts, carried out assembling on every part to complete its assembly drawing3) Established a Pro/e and Ansys seamless interface, then make use of the Ansys software to have carried out static analysis, modal analysis on the working arm with the basic idea of the finite element method. Through the static analysis can be drawn: place maximal stress in the weld seam, 70.676Mpa, less than the allowable stress. The maximal node displacement is located in the arm top, 0.326 mm, less than the allowable flexibility. Therefore, the working arm design structural rigidity to meet the requirements; through modal analysis and the modal expanding of the first 6 order can reach: the operating frequency should be designed in less than 130.76HZ, or 141.36HZ ~ 770.51HZ between.4)Static analysis carried out on the blade can be drawn: the maximum stress was in the point of a knife place, while the entire cutting edge place, blade bolt hole and the minor bit end of the blade is where the stress concentration. Blade can withstand five times the normal load impact.5) Analyzed the relationship of the cutting thicknessδbetween as, vy, and vc. The conclusion were thatδobtained extreme value when the as is 45°; increased vc or reduced vy can reduceδ; cutting power enhanced with the increase ofδ; by choosing increase vc, or lower vy or decrease as depending on differentδ, the power consumption of soil cut can be reduced effectively.6) Established the power's mathematical model of the trencher. The power consumption is optimized to reduce power by 30%. When the advance speed vy = 100m / h, chain cutting speed vc=1.35m/s, ditching machine angle as=45°the trencher power consumption was minimum.
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