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1、Computer Aided Design of Oval Gear of Separatingplanting Mechanism with Planetary Gears of Non-eccentricityAbstract： SeparatingPlanting Mechanism with Planetary Gears of Non-Eccentricity is a newtype mechanism The mechanism is constituted by three parts they are oval gear transmission division，plane
2、tary gear transmission division and plant the armBasic thought of designing is adopting oval gear transmission，choice the fit construction parameter to ensure Asymmetry transmission ratio and screw the angle relation of the request of transplant rice seedlingThe thesis will expatiate how to computer
3、 geometric pare meter of oval gear， analysis transmission character of oval gear，and ensure transmission ratio and Angle of pressure in the period of Engagement of oval gear.Key words： agricultural engineering；separating-planting mechanism with planetary gears of non-eccentricity；design；oval gear；co
4、mputer aided design1. Transplanting Mechanism with Planetary Gears worksAs shown in Figure 1, the diagram of The Planetary Gears rice transplanter transplanting mechanism make up with four congruent the Zhengyuan gear and 3 congruent oval gear. 3 rotation center of the oval gear are in the focus of
5、the oval ear, They have same initial phase. The center oval gear (3) (also called sun wheel) fixed . Gearbox (equivalent carrier) is drived by the central axis, the equivalent of a prime mover pieces rotate around the rotation center 0 of the sun wheel. Since the two oval gears (3) and (4) engages t
6、hat caused the change of the transmission ratio, so the two planets circle gear that symmetrical arrangement are swinging back and forth, seedling claw move at the required posture (Angular displacement and trajectory). The basic idea of the design is use the non-uniform drive of oval gear pair and
7、select the appropriate structural parameters to find the work trajectory, the take seedlings angle and the planting angle that meet planting requirements. 1. Planetary circular gear 2. Intermediate circular gear 3 Central oval gear 4. Intermediate oval gear 5. Seedling needleFigure 1 a schematic dia
8、gram of planetary gears Transplanting Mechanism2.Oval gear rotation relationshipFigures 2 and 3 as a pair of congruent oval gear meshing relationship diagram Figure 2 is the initial position of the elliptical gear drive capstan do uniform motion, when the one pair of congruent oval gear, the rotatio
9、nal speed of the wheel from moving periodically changes. Thus, the geometric characteristics of the oval gear only with eccentricity and fixed axis rotation relationship of the gear train and a pair of larger eccentricity the oval gear Vice corner relations are quite. Therefore, appropriately changi
10、ng the eccentricity of the elliptical gears can meet the requirements of transplanting angular relationship. Elliptical gear drive transmission nature has laid a theoretical foundation for this article Transplanting Mechanism oval gear design of planetary gears.Figure 2 starting positionFigure 3 rot
11、ated position3. Oval gear design3.1 Oval gear pitch curve arc length calculationThe origin of the polar coordinate is taken at the oval lower focus 0, to the geometric center of the ellipse O, as the coordinate origin for a Cartesian coordinate system Oxy axis in the minor axis direction, Y axis in
12、the long axis. That O center, the major axis of the ellipse radius for two circles radius a and minor radius b. Figure 4 shows the to diameter O i and the x-axis is y, it is the intersection of these two circles, respectively by i, i and j for the line parallel to the x axis, as a line parallel to t
13、he y axis by j the two lines intersect at M (x, y) based on the elliptical nature of the point M is a point on the ellipse. Terms of y angle variation of parameters, the parametric equation of the ellipse.Figure 4 oval gear pitch curve arc lengthKinematics modeling and analysis of transplanting mech
14、anism with planetary elliptic gears for pot seedling transplanterAbstract：To analyze the working performance of the transplanting mechanism with planetary elliptic gears for pot seedling trans planter which was proposed in this paper，the kinematic model of this mechanism was established， and the equ
15、ations of(angular)displacement，(angular)velocity and(angular)acceleration for transplanting tip were deducedOn this basis，the kinematic simulation and optimization software of the mechanism was compiled by Visual Basic 6.0Besides，the influence of several main parameters on the working performance of
16、 the mechanism was analyzed by this softwareThese main parameters included the semimajor axis of elliptic gear，the ratio between minor axis and major axis，the initial installation angle of the planet carrier and row spacingAnd working perform ances included hole size，trajectory attitude of transplanting tip and its verticality，and operational stability of the mechanismAccording to the analysis results，a group of preferable mech
