Study On Design And Experiment Of Walnut Grading And Shell-Breaking Machine

Our country is one of the largest producer of walnuts, and the annual yield ranks the second of the world. However, the development of domestic walnut shell-breaking machine is relatively backward, which reduces the commodity value of walnuts.therefore, China is in urgent need of a broken shell device, which needs high efficiency and good effect of broken walnut shell.This machine is designed on the analysis of existing walnut shell devices, the main contents include:(1) The research study (Taigu cotton and cardboard walnut, Fenyang cotton walnut) an analysis of the object physical characteristics, which includes 3D size measurement, thickness of walnut, and walnut shell breaking force, which obtained by Quasi static compression experiments, Thus laid the foundation for the design of walnut grading and shell-breaking machine.(2) Using mechanism design theory, the machine includes four parts, feeding device, transmission device, the grading device and shell breaking device, firstly, the feeding device with vibration can feed uniformly, then the transmission device can transfer the walnut to grading device levelly, and the grading device automatically grades the samples, finally they are broken in the grading and shell-breaking device.(3) Using 3D modeling software Solid Works to establish the model of walnut grading and shell-breaking device, which aims to test and verify the relevant design and assembly.(4) To establish the 3D model of the walnut grading and shell-breaking device, the frame finite element analysis was carried out by using ANSYS Workbench software, including static analysis and modal analysis, then optimization design the frame structure.(5) For breaking test of the walnut grading and shell-breaking device, the test factors include the rotate speed of classification auger, the speed of moving knife, the up and down of the pitch difference with the broken shell device and the classification device. A broken shell rate and high kernel rate are test indicators, in the test I use a method of response surface design to test analysis, in the end, I get the optimized parameters of walnut shell breaking device.The walnut grading and shell-breaking machine includes both grading device and shell breaking device, the mechanism is simple, the operation is convenient, and it provides a reference for the further development of this kind of products.