Design A Topographic Device For Weeding Between Grape’s Plants

This article focuses on solving the obstacle avoidance problems encountered in the weeding operation between grape plants in Ningxia,such as early obstacle avoidance time,delay in obstacle avoidance,slow operation speed,and high cost,in order to solve these problems that limit the difficulty of existing weeding machinery in weeding.Based on the investigation of the agronomic parameters of wine grape planting in Ningxia,combined with computer aided design and kinematics simulation,a cross plant weeder with the function of terrain simulation and double cylinder obstacle avoidance was designed and verified by field experiments.The specific research content is as follows:(1)Through field investigation,the planting patterns and soil type of main wine grape producing areas in Ningxia were analyzed.On the basis of on-site measurement and statistical analysis,the most representative grape planting mode of Xinniu Winery’s wine grape planting base was selected as the experimental paradigm,laying the foundation for the structural design of the prototype and subsequent research on the integration of agricultural machinery and agronomy.(2)Design the overall structure of the terrain like weeding machine between grape plants,and analyze and calculate its key parameters.Based on the agronomic parameters of grape cultivation in Ningxia,a passive contour copying,double oil cylinder rotating around the vertical axis to avoid obstacles,terrain like weeding machine between grape plants was designed.Combining motion analysis and force analysis,the main factors affecting the weed removal rate and plant damage rate of the prototype are determined to be the floating range of the simulated terrain device,the swing angle of the wheel hub,the angle of the weed removal tool entering the soil,the number of mowing tools in the cutting device,the stiffness coefficient of the return spring in the contact device,and the selection of obstacle avoidance cylinders in the hydraulic system.This provides a basis for determining the factors and indicators for optimizing the simulation of the prototype parameters.Based on design calculations,conduct trial production of the prototype.(3)Based on the determination of the overall structure of the terrain like weeder among grape plants,the prototype was analyzed by kinematics,statics and hydraulic system simulation.The three-dimensional model of the prototype was established using SolidWorks software,and the kinematics simulation of the model was carried out with ADAMS software.With the coverage rate of weeding operation as the experimental index,combined with the single factor experiment and the secondary center combination experiment method,the optimal combination parameters of the prototype were obtained:the operating speed v was 600 mm/s,and the touch bar angle threshold α 25°,rotating arm rotation angle β 25°,blade rotation angle γ30°.Through the statics analysis of the weeding shovel by AN SYS software,its reliability was verified.The AMEsim software was used to simulate and analyze the obstacle avoidance cylinder subsystem of the hydraulic system.The rationality of the obstacle avoidance cylinder subsystem design in the hydraulic system was verified by comparing and analyzing the response speed and response time of the cylinder with field test results.(4)Field performance tests were conducted on the prototype.Referring to the herbicide standards for field performance testing of relevant agricultural machinery,the weeding rate,plant injury rate,and pure hourly working rate are selected as the performance evaluation indicators of the prototype.Field experiments were conducted to compare the terrain like weeding machine between grape plants with existing models.The results showed that the various performance indicators of the terrain like weeding machine between grape plants met the requirements of relevant standard indicators,and the comprehensive performance of the terrain like weeding machine between grape plants was better than the existing models,verifying the rationality of the design.