Design And Experiment Of Cultivator Ridging Mechanism And Resistance Test Mount Device

Corn is an important global food crop and has strong multifunctional properties.The global demand for corn continues to increase,and the arable land area of China continues to decrease.Each year,China’s crop yields are reduced by billions of kilograms due to lodging and grass damage.Reducing corn lodging and grass damage is an important way to increase corn production and guarantee Corn production can solve the increasingly acute contradiction between supply and demand.Cultivated soil cultivation is an important part of China’s agricultural intensive cultivation and an important way to ensure crop yield and quality.It can loosen soil,increase surface temperature,prevent floods and soil erosion,promote crop root development,eliminate weeds,and reduce the occurrence of pests and diseases.At present,there are not many types of cultivating soil machinery in China.There are mainly disc,rotary cultivator,rotary plough,and hoe types.Most of them have many problems such as poor general adaptability and easy clogging.This article aims at the middle-tillage operation after no-till sowing in the conservation tillage mode of Northeast China.According to the technical requirements of cultivating soil and combining the working surface of a dozer blade,a curved wing adjustable soil cultivating mechanism matching the cultivating machine was designed,including a drag test attachment connected to the field cultivator,while monitoring the tillage depth.The designed resistance test hook device also has the contouring function.According to the designed overall scheme of the resistance test coupling device,design each component of the tension and pressure sensor coupling assembly,each component of the angle sensor coupling assembly,and the coupling frame of the coupling device and the cultivator.In the last,determining the structural parameters and connection methods of each component.The curved-wing soil-cultivating mechanism designed in this article performs soilcultivating operation under the traction of a field cultivator.The soil shovel wing IV consists of two parts,the plane and the curved surface.During operation,the soil particles fall along the direction of the curved surface and the soil is more densely packed,and has a higher height and a wider width than conventional soil shovel.The rear attachment method of the soil shovel handle has effectively improved the problem of weed entanglement and blockage of the implement.The main working parts of the curved-wing soil-raising mechanism are the soil-growing bottom plate,the soilreceiving plate,and the soil-raising shovel blade.By analyzing the soil reaction force that each working part receives during operation,the working resistance of the entire mechanism during operation can be obtained.The soil-cultivating effect and working resistance of the mechanism are related to the angle γ of the blade,the working speed v,the depth of penetration h and other factors.Through EDEM discrete element simulation analysis,the control variable method was used to obtain the soil height,soil width,and soil fragmentation rate of the soilcultivation mechanism after combining different factors.The simulation results show that with the increase of the three factors,the soil fragmentation rate increased;when the working speed and the depth of the soil increased,the soil width increased;when the included angle of the blade increased,the soil width decreased and the soil height increased,the increase of the working speed and the included angle of the shovel wing first increases and then decreases;when the depth of soil penetration increases,the soil cultivation height increases.Using Matlab to process the operation effect screenshot after the simulation process,we can intuitively obtain the best results of soil cultivation at different parameter levels.The maximum width of soil cultivation is 128.025 mm,the maximum soil cultivation altitude is 71.21 mm,and the maximum soil fragmentation rate is 80.059%.The comparison simulation results show that the soil cultivating mechanism designed in this article is better than traditional soil shovel.The reliability and accuracy of the resistance test hook device designed in this article were verified by indoor soil groove test.The results show that the maximum relative error of the RTMD test device relative to the TFMD test device is 8.807%,and the minimum relative error is 6.979%.The test value obtained from the field ploughing depth monitoring test is compared with the measured value after the field test.It is found that the monitored value is basically close to the measured value.The relative error of each data point is not more than 3% compared with the same level data.In the same test conditions.The lower relative deviation range is basically similar.Field comparison test with the traditional double shovel flat soil shovel at the same parameter level,we can obtain that the curved wing soil cultivating mechanism designed in this article has a relatively high pass rate and soil fragmentation rate after operation.Using Box-Behnken Design in Design-Expert software to design an orthogonal combination test.Conducting field trials and optimizing analysis of test data,It is concluded that the optimal parameter combination for field soil cultivation of curved wing soil cultivation mechanism is:working speed is 7.57 km/h,the included angle of the shovel is 61 ° and the penetration depth is 152 mm.At this time,the Cultivation altitude is 62.13 mm,and the soil fragmentation rate is 86.78%.