Study On The Design Of Lifting Device And Transmission System In The Picking Device Of Safflower Harvester

Xinjiang is a major province of safflower cultivation.The harvesting of red safflower mainly relies on manual harvesting.Due to its high labor intensity,low production efficiency,shortage of labor force during harvest time,and high labor costs,mechanized harvesting has become the development of the safflower industry.The inevitable trend.In view of the current labor-intensive and low-efficiency problems of the backpack-type small harvester,the group proposed a comb-type harvester scheme that is suitable for large area red-stem mechanical harvesting.Based on this scheme,a reliable hydraulic lifting device and hydraulic transmission system are designed in this paper to achieve a large working area of the harvesting mechanism,increase the smoothness and flexibility of the movement,and ensure the reliable performance of the safflower harvester.This article designs and optimizes the lifting device and hydraulic transmission system.The main contents are as follows:(1)Through reviewing the literature,the situation of the existing safflower harvesters at home and abroad was analyzed.Based on the current problem of artificial backpack harvesting,based on a self-propelled comb-clamping harvesting scheme proposed in this issue,a design was Harvester lifting device.In order to achieve the adaptability of the harvesting device according to the growth characteristics of safflower.(2)The data processing method was used to obtain the relationship between the height of safflower plants and the spatial distribution of safflower fruit balls.The maximum range of vertical distribution was determined to be L1max=59.3cm and the maximum range of horizontal distribution was L2max=133.8cm.By establishing kinematics equations,the working ranges of the main hydraulic cylinder,sub-hydraulic cylinder,and auxiliary hydraulic cylinder are determined to be 600mm~1050mm,600mm~1050mm,and 400mm~500mm,respectively,and the equations for the displacement speed of the lifting mechanism and the cylinder extension speed are established,and the Admas is passed.Motion simulation and SolidWorks finite element analysis verify design rationality.(3)In this chapter,through the working requirements of the lifting mechanism,using the deformation design method to design the hydraulic system to determine the control system is open,the system pressure is 10 Mpa,the main valve is the main valve of the piece type,and the working principle diagram of the system is proposed and revised.According to the preparation of the hydraulic schematic diagram,the hydraulic components required by the system are selected for parameter calculation and determined for each part model.(4)In this chapter,the principle of PLC for PID closed-loop control is adopted to design the hydraulic control system.According to the work requirements of the safflower harvester,the PLC design principle of the system was proposed as the PID closed-loop control in the open control system,and the transfer function of the PID control of the hydraulic cylinder in Matlab was deduced.According to the design principle,the hydraulic system PLC hardware design,select the specific hardware models,draw the control system wiring diagram.The human-computer interaction interface design is completed in Mitsubishi touch screen programming software GX Works2.(5)Select each component model and set the parameters of each component in the AMSEim software according to the actual situation,establish the hydraulic system model according to the hydraulic schematic diagram,analyze the rationality of the component flow rate and pressure change verification design through analysis of the solenoid valve component alone,and analyze The flow rate of components is changed,and the positive and negative control time parameter t=1s is optimized.Through independent simulation of the electromagnetic proportional valve element,it is determined that the displacement of the valve core is not affected by the pressure or has little influence.The control parameter range is determined through valve simulation of the PID control system.After the software comes with the module optimized control parameters k_p=550,k_i=0.65,k_d=0.83.Through the simulation of the whole system,it is determined that when the hydraulic cylinder suddenly starts,the pressure of the hydraulic system under different control parameters is analyzed to determine the hydraulic pump’s time control to be advanced by 1s when the hydraulic cylinder is started.Through three groups of PID control simulation verification,the rationality of the system parameters of the three groups of hydraulic cylinders is verified.(6)According to the working condition of the hydraulic system,analyze the assembling process of the hydraulic system and determine the assembly process.