Design And Test Of Transplanter Powered Drilling Mechanism

The traditional way of punching holes in Xinjiang is passive stamping which rely on the quality of the cower or crank drive mechanism driven duckbill cone structure to the ground stamping.After puncturing the soil,the soil will be squeezed into holes.Because of soil strength and moisture content,the depth uniformity is poor.The multi-rod active mechanism was designed in this paper in order to solve the problem of polygon rolling effect on hole stability which caused by passive punching mechanism,which indicates that the mechanism operates stably and keeps the cave shape in good consistence.Through the data collection of the experimental sites of Sanping Farm and Wuyi Farm,the physical properties such as compaction,temperature and humidity of the soil under the suitable planting season in spring were obtained.By discussing the influence of compaction and temperature and humidity on the hole shape,the relationship between soil temperature and humidity and compaction is found,which provides data support for the piercer design and how to maintain the hole shape stability.Drill bit is the key working part of the hole mechanism.Stress analysis of the working process of bit cutting and soil sending,force analysis of soil,establishment of mechanical model,and the factors that affect the drilling effect of bit are obtained.Produced a drill model,designed a set of experiments,obtained by the test of cutting angle,radius and speed combination,the hole stability of the highest.The test found that soil moisture,working hours have an impact on the stability.A multi-bar mechanism is designed to make the locus of the hole-forming device approach to the trochoidal line basically,the polygon effect can be avoided,the hole-inserting device can be more stable,and the hole shape can be maintained by drilling and borrowing the earth.In this paper,we designed a multi-rod active mechanism,using Matlab to get the parameters of multi-rod mechanism.Using the kinematic analysis of Solidworks Motion,we got the conclusion that when the forward speed of the mechanism is 800 mm / s and the rotational speed of the crank is 65 r / min,the labyrinthine trajectory can be formed and remain relatively still.The dynamic analysis of the mechanism was carried out,and the law of the change of the driving torque of the mechanism was obtained,laying a theoretical foundation for the prototype production.After the pre-theoretical analysis and simulation as the basis,this paper designed and produced a multi-rod drilling mechanism.The movement locus and movement of drill hole device were analyzed,and the mechanism parameters were obtained.After field test,the pass rate,hole depth and hole pass rate and coefficient of variation as the evaluation index of the device.The results show that when the drilling mechanism advances at a constant speed and punches holes,the compliance rate of hole spacing is 95%,the compliance rate of hole depth is 95.12%,the hole diameter compliance rate is 90.26%,the coefficient of variation of hole spacing is 3.2%,the hole depth coefficient of variation is 5.1% and the coefficient of variation of hole diameter is 5.2%,which indicates that the mechanism operates stably and keeps the cave shape in good consistence.