Improvement Design And Experiment Study On Performance Of High-speed Transplanter For Rice Seedling-growing Tray Made Of Paddy-straw

In this paper, high-speed planting technology in fixed point of bowl growing tray made of paddy-straw (key technology for rice cultivation techniques of seedling-growing tray made of paddy-straw) was researched based on major improvement high-speed transplanter (VP6) produced in Yanmar Cooperation. In the case of unchanging the whole generic functions, through improved design for critical components, functions of transplanter of bowl growing tray made of paddy-straw in fixed point can be realized for ordinary transplanter. That is, change the disorderly planting function to the Pendulum-like planting orderly for bowl growing tray made of paddy-straw in fixed point,The main contents were included as follows:1. Improved design and analysis of longitudinal transverse feed mechanism and key mechanism. The cutter and components of pushing seedlings were redesigned according to the structure size and planting agriculture requirements. Kinematics of planting mechanism of eccentric gear planetary system was analyzed, especially focusing on change rule of velocity, acceleration and movement locus of the cutter’s end point. The cutter and materials were determined through simulation analysis on stress of cutter with different structure and materials in fetching seedling process. Kinematic analysis was carried on rod of pushing seedling. Change rule of load in pushing seedlings process was researched using the finite element analysis method. The dangerous failure section was determined to ensure the pushing seedling quality.2. In order to lay the foundation for finite element analysis of spiral shaft-slider joints, kinetics model of spiral shaft-slider joints was built. Reliability of spiral shaft was analyzed, including reliability of the wear resistance, the stiffness and the stability. Mathematical model of relevant reliability was built providing theoretical basis for life time calculation of spiral shaft. Kinematic parameters of were optimized. The base cylinder radius of spiral shaft was determined and expression of meet the conditions for base cylinder radius of spiral shaft was get. Velocity and accelerated velocity of trigonometric, parabola and arc transition curve were compared. Spiral shaft quick-return transition curve type was determined after optimization analysis. Factors resulting to fatigue rupture of spiral shaft-slider joints were studied using finite element method. Stress-strain change rule curve with load and the rotate speed was get. The lubricating condition of spiral shaft was analyzed From the Mechanism and experiment point of view respectively3.Reliability of longitudinal feed mechanism and cutter were tested through single factor repeated experiments and analysis of variance based on the high-speed transplanter improved. Performance indexes were also tested using high speed photography and image processing techniques. The theoretical motion curve, kinematic velocity and the inclination changes of improved cutter’s front point were analyzed. Transplant mechanism fit theoretical design and work requirements through comparison between experimental and theoretical results. Three-dimensional dynamic detection was carried on seedling posture using high speed photography in planting experiment. Test results show that transplant mechanism can finish the whole transplanting process completely. Taking seedling angle and transplanting seedling angle are consistent with the theoretical value. Seedlings were divided successfully and seedling did not shedding in the carrying seeding process. At the moment of push seedlings, seedlings kept vertical with ground basically to meet requirements of orthostatic planting. Finally, through production test validation, it’s satisfied that the transplanting results of improved transplanter for seedling-growing tray made of paddy-straw in fixed point. The performance is reliable.