Research On Lifting And Folding Double-sided Disc Orchard Ditching Machine

In the past 30 years,China's citrus industry production has gradually shifted from quantitative to qualitative.The problem of low mechanization of productivity in the development of fruit industry is particularly evident in the gully orchard trenching and fertilization.In order to realize the digging of the citrus orchard on both sides,the lifting and folding double-sided disc trenching scheme was proposed.The software was designed and optimized by ANSYS and ADAMS.The experimental research was carried out.The main research contents and conclusions are as follows:1)Having researched status and development of the trenching method and principle of the orchard trencher globally,referring to the characteristics of various trenching methods,combining the agronomic and soil characteristics of citrus orchards,innovatively proposed a double-sided disc-shaped orchard.Compared with a variety of ditching blades,the ditching blades of the double-rotating blade type are comprehensively selected,and the theoretical calculation and the speed test are used to verify the parameters such as the rotating diameter₀D,the tool width profile distance B',and the number of mounting blades z.Data structure and theoretical support are provided for the frame structure design and the whole machine transmission scheme.2)Completed the overall design of the trencher to have three functions:rotary ditch,fuselage folding and walking lift.Introduce the operation mode of the rotary ditching system,the fuselage folding system and the supporting walking and lifting system of the trencher,and the gear-gearing gearbox,folding device,locking device,lifting device,hydraulic control,etc.Structural design selection and theoretical analysis of key components and mechanisms.3)Using the ANSYS software to carry out finite element modal analysis and structural performance analysis of the frame,and improve and optimize the structure,and verify the modal test.The finite element simulation results show that the fixed stage frame before the improvement,the first order natural frequency is 34.983 Hz,falls in the range of 0 to35 Hz excitation frequency,and the maximum stress is 72.3896 MPa.The improved fixed section frame is inherently fixed.The frequency is 52.884 Hz,which is 17.901 Hz higher than that before the improvement.The excitation frequency range is avoided,the overall stress distribution is very uniform,and the maximum stress is 6.301 MPa.The modal test verification results show that the relative error with the simulation results is only-0.103%,the maximum error percentage is 0.857%,and the vibration modes are basically the same,which provides a reference for practical applications.4)Combined with the technical requirements of the folding system,the design uses the WSP-D70-D50-L650-800 retractable cross universal coupling.Using the ADAMS software to build a virtual prototype model of the retractable cross universal coupling,analyze its motion law,analyze the constrained projection angle change and the binding force/torque change,and obtain the telescopic cross universal joint in the rack folding system.Under the action of the device can meet the design requirements of the 75°limit position and 70°safe position.The stability of the angular and linear velocity analysis of the retractable cross universal joint is discussed,which lays a theoretical foundation for the research of the fuselage folding system and provides a solution for the determination of the subsequent folding hydraulic cylinder.5)By analyzing the range of rotation angle of the gearbox?=18.78°⁸2.35°,the stroke change of the grooved hydraulic cylinder is y=410.923mm⁴83.061mm,and the maximum tensile force_?F=3534.941N is calculated.The HSGL01E50/25-300 hydraulic cylinder is determined as Ditch hydraulic cylinder,HOB50X350CA hydraulic cylinder as a folding hydraulic cylinder.Furthermore,a simple operation,time-saving and labor-saving hydraulic drive control system is realized to realize individual control of each hydraulic cylinder,and simultaneous control of four hydraulic cylinders can also be realized.6)The prototype of the trencher was prototyped.ChooseL₉3?⁴?land that is close to the field for outdoor testing.The power consumption is analyzed by orthogonal experiment.The effects of trench depth H,forward velocity v and cutter speed n on the power consumption of the trench depth are studied.It is concluded that the depth of the trench has the greatest influence on the power consumption.The second speed,the impact of the forward speed is small.Therefore,under the condition of insufficient power,it is preferred to sacrifice a certain ditch depth?not less than 14cm?to ensure the working efficiency.The quality inspection test of the trenching operation found that the five indicators of the trenching depth,the depth of the trenching depth,the width of the rectangular trench surface,the thickness of the floating soil at the bottom of the trench,and the rate of soil breaking were all met during the operation.The NY/T 740-2003 field trencher operation quality standard stipulates that it meets the horticultural requirements for fertilization in citrus orchards.