Design And Research On Variable Frequency And Variable Amplitude Vibrating Subsoiling Vibration Test Bench

Mechanical subsoiling serves multiple functions including breaking the plow pans,improving the water storage capacity of soil,adjusting the three-phase ratio of soil,reducing rainfall runoff as well as water erosion.Therefore,mechanical subsoiling is an effective measure to improve agricultural comprehensive production capacity and to facilitate the agricultural sustainable development.The dry farmland covers an area of more than 1.1 billion mu in C hina,0.575 billion mu of which are suitable for the application of mechanical subsoiling.With the strong support of government,a rapid development has been made in the researches on subsoiling technology and subsoiling machine in recent years.However,the subsoiling machines also have some shortcomings such as low operating efficiency,high power consumption and poor adaptability.The research on the improvement of adaptability of subsoiling machine and reduc tion of traction resistance is one of the focuses of agricultural mechanical engineering researches in recent years.In order to improve the efficiency of subsoiling machines,to reduce energy consumption and enhance their adaptability,on the basis of researches on the mechanism of vibration subsoiling and existing vibration structures,field experiments were conducted to collect data and the hydraulic servo test bench equipped with adjustable frequency and amplitude vibration subsoiling was developed.In order to study the dra g reduction mechanism of vibration subsoiling,data on soil physical properties were collected through experiments and the field experiment of vibration subsoiling was carried out.In the experiment,s ingle factor test was applied to collect the data including slip rate of unit operation,distribution of traction resistance and three dimension acceleration characteristics of the vibration of a deep shovel in the cases of vibration and non-vibration of subsoiling machine respectively.The traction resistance reduced obviously,which was reduced by 19.15% with vibration compared to the case without vibration of subsoiling machine.In terms of average slip rates of unit operation,they were 32.33% and 23.08% respectively on the condition with vibration of subso iling machines and without vibration,which was reduced by 9.25%.The data collected is for the following design of test bench.In order to realize the functions of test bench including stepless adjustment of real time vibration frequency and amplitude and the free combination between the vibration frequency and amplitude.The test bench adopted servo hydraulic cylinder as the vibration exciter.The test bench consisted of three-point suspension,frame,gear box,double gear pump,fuel tank assembly,energy storage device,servo hydraulic cylinder assembly,scraper,static pressure module and the main valve block.With the help of computer control,the PLC plus servo feedback could be applied to control the servo cylinder to produce vibration.According to the requirements of the test bench,the hydraulic system of the test bench was designed and the introduction of the working process of the system was made.The important components of the system such as hydraulic cylinder,servo valve,relief valve and accumulators were calculated in detail and selected carefully.Starting with the trajectory and motion characteristics of the vibrating test bench,the vibration motion model of the deep shovel was established.The Solid Works three-dimensional modeling and motion simulation analysis of test bench have been finished.The trajectory of the deep vibrating shovel met the requirements of requirements of the drag resistance mechanism of the deep vibration,which belongs to two-dimensional cutting.Processing and manufacturing of the test bench equipped with adjustable frequency and amplitude vibration subsoiling has been finished.The performance test of s ervo hydraulic cylinder and the test bench were also completed,whose results showed that the design goal was achieved.