Design And Test Of Combined Vibration Subsoiler With Pre-ripping-soil

The deep loosening operation can break the hard bottom layer of the plow under the long-term rotary tillage operation,which is conducive to improving the original soil physical and chemical structure and biological properties produced by long-term cultivation.In addition,the deep loosening operation can also enhance the soil’s ability to retain water and fertilizer Promote the growth of crop roots,increase crop yield and quality of agricultural products.However,subsoiling operations have large tillage resistance and high energy consumption.How to improve the adaptability of subsoiling equipment to subsoiling operations after different tillages and reduce the traction resistance during tillage as much as possible.It is one of the key points of agricultural machinery engineering research and deep pine technology promotion in recent years.Subsoil shovel,as a part that directly contacts with soil,directly cuts and breaks the soil,which has an impact on subsoil resistance and future crop yield.Therefore,the research design of subsoil shovel has important significance.In this paper,the southern clay soil is taken as the research object,and the structural design of the deep shovel shovel is taken as the research goal.The method of combining variable frequency amplitude vibration and pre-breaking soil is used to promote the mechanical deep pine drag reduction effect.Crack development effect,developed a deep shovel with a circular arc breaker,using a combination of three-dimensional modeling,numerical simulation and field test research,to study the deep soil components under the frequency conversion and amplitude vibration of the broken soil mechanism and Drag reduction efficiency,as well as the effect of pre-breaking soil on deep vibration loosening,reveal the relationship between the structural parameters and vibration working parameters of the variable frequency amplitude vibration and pre-breaking soil deep vibration loosening system,soil mechanical performance parameters and deep loosening resistance,and verify.The main research contents and conclusions are as follows:(1)Determination of soil structure and mechanical parametersUsing soil mechanics test methods to test the physical and mechanical properties and structural parameters of soil density,moisture content,shear modulus,Poisson’s ratio,accumulation angle,soil firmness,etc.,to prepare for further numerical simulation.(2)Calibration test of the test systemIn order to simplify the traditional method of determining the deep traction force,two tractors are connected in series,and a single tractor can complete the deep pine test.This paper has specially developed a data transmission record test system by improving the installation method of the tension and pressure sensor,and carried out Calibration test to obtain the following functional relationship:Y=8×10~5~2-0.0926+2794.5,where y is the load(N)and x is the electrical signal collected by the sensor(V)(3)Design of pre-breaking soil combined vibration deep loosening shovelCombined with the research status of deep loose tools at home and abroad,through the experimental study of soil failure criteria and cutting crack prediction,a circular arc-shaped adjustable breaker with adjustable installation position was developed to change the installation coordination of the breaker on the shovel arm The position can adjust the installation height and inclination angle of the breaker,and conduct a simulation test.Finally,according to the simulation results,the best structure of the pre-breaking soil combined vibration deep shovel under the conditions of southern clay is obtained.(4)Simulation test of pre-breaking soil combined vibration deep shovelThrough the three-dimensional drawing software Solid Works,the subsoil shovel model,the vibration subsoil test bed model and the tractor model were established and assembled.The particle bed of the soil simulation model was established by using the granular discrete element EDEM simulation software,and the multi-body dynamics simulation software Recur Dyn was used to add driving force and EDEM coupling to carry out the deep loosening simulation test.The results show that the new design of the breaker has an inner arc radius of 150mm,and the installation position is in group(3).The type of deep loose blade is the best.(5)Field test of pre-breaking soil combined vibration subsoil shovelThe test results show that at the same amplitude of vibration frequency,the forward speed is consistent,the new shovel vibration is effectively reduced by 10.15%than the non-vibration,the new shovel vibration is effectively reduced by 12.10%than the old shovel,and the new shovel vibration is effectively reduced than the old shovel without vibration 21.72%,the new shovel does not vibrate 2.17%more effectively than the old shovel,the new shovel does not vibrate 12.88%less than the old shovel,and the old shovel vibrates 10.94%less than the old shovel.The water content increased significantly compared with that before the deep pine,and the firmness was effectively reduced.The test results for the installation position of the pre-breaker show that the effect of deep loosening at position(3)under the same inner arc radius is better.