Experimental Study On The Performance Of Double-coupling Bionic Drag-reducing Subsoiler

As one of core components of subsoiling,the subsoilers play a critical role in the aspect of quality and efficiency of work.However,the problems of resistance,surface adhesion,wear property and power consumption have been perplexing the development of subsoiler.In this study,based on the principles coupling bionic,discrete element,metal surface alloying,the subsoilers were implemented on structure optimize design for the defects mentioned above.In this research,reverse engineering software was used as establish three-dimensional models of double-coupling bionic subsoiler by means of observing and analyzing the surface structure characteristics of badger claw toe and pangolin scales.The resistance and anti-sticking properties were tested through discrete element simulation technique and field trials.Subsoiler drag reducing resistance,anti-sticking properties.Surface alloying is one of methods to improve the surface wear resistance.In this study,Ni60 coating and Ni60+Ce2O3+nano-SiO2 coating were sprayed on the surface of shovel body by plasma spraying technology,and then the wear properties were tested through field trials in order to compare the two subsoilers with coating.The main contents and conclusions of this study are as follows:1)The physical and mechanical properties of soils,including soil moisture content,density,compactness,cohesion and internal friction angle,were studied in the experimental fields of Gongzhuling in Jilin Province and Gaocheng in Hebei Province;2)The characteristic parameters of badger claw toes were extracted and fitting by Matlab software,and eventually the curve equations were established.Based on the surface structure of pangolin,the relevant characteristic parameters were obtained.The six new designed subsoilers possessed one of depth of the groove bionic structure,the size of the rounded edges of the groove bionic structure and the thickness of the shovel handle.The parameters named soil pressure ratio and specific resistance were applied to stress analysis of subsoiler tip.The mechanical calculation method of subsoiler working resistance was presented in this research.3)As a case study of soil particle model in Jilin Province,discrete element simulation was applied to analyze the resistance and soil disturbance of double-coupling subsoiler.The results showed that the subsoiler named J5,F5-40 and F5 possessed lower drag resistance compered the others.The type of F5J5 showed the minimum of soil disturbance.The size of the rounded edge of the groove structure and the depth affected the drag resistance and disturbance,the deeper the groove depth,the better the effect of drag reduction,the smaller soil disturbance.4)The double-coupling bionic subsoilers were tested through field trials in Hebei province and Jilin Province,respectively.The results showed that the average drag reduction of the type of F3 subsoilers were 15.14% and 10.54% under the work condition of tillage depth 30 cm and three types of working speed in Hebei province and Jilin province,respectively.Simultaneously,the type of F5 subsoilers were 14.54% and 14.97% under the work condition of tillage depth 35 cm and three types of working speed,respectively.Compared the work effect of whole subsoilers,the F5-40 possessed the best drag reduction,and the average drag reduction were 17.42% and 27.24%,respectively.5)The composite powder coating which was mixed Ni60+Ce2O3+ SiO2 mixture had better reduction and adhesion reduction than Ni60 coating in field trials.The composite coating of subsoiler possessed better wear resistance than the normal.