Research On Hydraulic And Control System Of Panax Notoginseng Harvester In Greenhouse

Panax Notoginseng is a famous Chinese medicinal material unique to the southern region of my country.Its annual production value exceeds 100 billion yuan It has high medicinal and economic value and is the main component of "Yunnan Baiyao".At present,the harvesting method of greenhouse Panax Notoginseng is mainly based on manual harvesting,and it has not been equipped with complete and reliable harvesting equipment.Manual harvesting has the disadvantages of low efficiency,high labor intensity,and high cost.It has caused unnecessary economic losses to farmers and severely hindered the sustainable development of Panax Notoginseng industry.Therefore,the research on the mechanized harvest of Panax Notoginseng has become an urgent scientific research task.This paper mainly focuses on the agronomic requirements of Panax Notoginseng in the greenhouse.From the perspective of ensuring the depth of excavation,improving the efficiency of the whole machine and the level of automation,the design and related research on the hydraulic and control systems of the harvester are carried outThis paper relies on the sub-project "Overcoming the Panax Notoginseng Continuous Cropping Obstacles Engineering Facilities and Mechanical Equipment Research and Development" in Yunnan Province’s major science and technology special plan "Overcoming the Panax Notoginseng Continuous Cropping System Construction and Application" project.The specific research contents of this article are as follows:(1)Investigate the Panax Notoginseng planting base in the greenhouse,and measure the length and width of Panax Notoginseng planting trough,the planting depth of Panax Notoginseng and the physical characteristics of soil.Aiming at the agronomic requirements of greenhouse planting Panax Notoginseng and the design scheme of the mechanical components of the whole machine,a complete set of full hydraulic drive scheme was given;by comparing the open and closed hydraulic system schemes,it was determined to choose the open hydraulic system scheme;through the comparison section flow and volume speed control scheme,determine the choice of throttling speed control system scheme;use FluidSIM software to design the whole machine hydraulic transmission system,includes the design of the principle diagram of walking hydraulic system,rotating hydraulic system and lifting hydraulic system(2)Perform dynamic analysis on the whole machine of Panax Notoginseng harvester to determine the minimum traction force required when the harvester was working in 4868N.According to the structural parameters and dynamic analysis results of the harvester,the components of the hydraulic system of the whole machine were designed and selected,and the main performance parameters of the hydraulic system were checked.The verification results showed that the dynamic analysis of the harvester was reasonable,and the drive motor power,system pressure,hydraulic pump speed,motor speed,and overall machine speed met the requirements(3)For the hydraulic system of the whole machine,the design of the control system of the harvester was completed.The specific control methods were local operation and remote control.Using the electric control module in FluidSIM software to design the electric control schematic diagramof local operation;combined with hydraulic schematic and electric control chart for joint simulation.Design the remote control with PLC controller as the central processor,The ladder diagram language and GX Developer software were used to design the system software;and use PLC simulation software to simulate the design of PLC input/output ports.the simulation results show:The electric control chart of local operation and the software design of remote control meet the control requirements,and the design of PLC input/output ports was reasonable.According to the local operation electric control chart and the software design of remote control,the hardware model and parameters of the control system were determined(4)Use AMESIM software to simulate and analyze the hydraulic system.The simulation results showed that:under three different pressure differences,the control accuracy of the synchronous valve was between 1%and 3%,which met the design requirements;the design of the two-way hydraulic lock met the control requirements;the stable value of the traveling motor speed was 320r/min,the balance state of the systemwas reached after 2s of starting;the torque stability value of the walking motor was 170N.m,and the pressure difference of the motor was 5.8MPa,and the system need 1.8s to reach balance;The forward speed of the lifting hydraulic cylinder was 0.18m/s,and the retracting speed was 0.19m/s,which was basically consistent with the theoretical analysis results(5)Completed the assembly and debugging of the hydraulic and control system,combined the hydraulic and control system with the mechanical components,manufactured and tested a solid prototype,and conducted key performance tests on the prototype as a whole.The test results showed that under the dual control mode,the harvester could successfully complete the functions of straight travel,turning,excavation device lifting and lifting chain rotation and so on,and had sufficient power.The design met the requirements of minimal travel offset,and hydraulic and control system of the whole machine.