Study On The Scaled Model Of Compression Chamber And Its Electro-hydraulic Control System Of Large Rectangular Baler

At present,the comprehensive utilization of crop straw in China is relatively low,so it is urgent to use baling machine to reduce the storage space of straw and cut back the transportation cost for better application of straw.However,compared with Europe,America,Japan and other agricultural developed countries,the development of baling machine in China is still in a backward state,there are problems such as less compression density,low degree of automation.In this paper,the electro-hydraulic control system of the compression chamber is studied based on the tractor-type generous baling and baling machine of YuanHang Company.Based on the resemblance theory,this paper designs a scaled model of the compression chamber of the large rectangular baler,which can solve the problems of large volume and difficult production of the original baling machine,reduce the production and test costs,and shorten the design and optimization cycle.The scale scale is selected as 1:4,and the relevant parameters of the scale model are calculated and judged according to the derived resemblance theory,so as to ensure the accuracy of the parameters in the scale model.According to the parameters of the scaled model,CATIA 3d drawing software is used to draw the scaled model of the compression chamber.Then the CATIA 3d drawing software is used to draw the scale model of the compression chamber.ANSYS finite element analysis software was used to conduct static analysis of the compression plunger and the compression chamber in the scaled model respectively.Combined with the total deformation figure of the compression plunger and the compression chamber and the effect force diagram,the maximum deformation figure of the compression plunger was 0.27777 mm,the deformation area was concentrated in the lower half of the plunger plate,and the maximum equivalent stress was 10.292 MPa.The maximum deformation of the compression chamber is 0.022727 mm,the deformation area is concentrated at the end of the compression chamber,and the maximum equivalent stress is 3.2914 MPa.The simulation results show that the structural design of the compression plunger and the compression chamber meet the requirements.The matching hydraulic system is designed based on the scale model.Before designing the hydraulic system,it is necessary to calculate the relevant parameters of compression force,compression frequency and shrinkage test and select the type of hydraulic components.The designed hydraulic system was simulated by using the Amesim hydraulic simulation software.The simulation results showed that the working speed of the hydraulic cylinder was 0.27 m/s and the no-load running speed was 0.38 m/s.The maximum output pressure of the hydraulic cylinder is 40 bar.In summary,the design of the hydraulic system meets the requirements.The control system is designed for the hydraulic components in the compression process,also based on the scaling model.Select PLC control mode and select the corresponding sensor according to the working process.TIA Portal V15 was used to simulate the programming control system.After that,the control system is combined with the hydraulic system to build the electro-hydraulic control system of the scaled model and debug the PLC control program.The results show that the control system can control the actuator.