Design And Analysis Of A Sorting And Packing Device For Cassava Seed Stem

Cassava is a plant of the euphorbia,whose stem is nearly cylindrical in outline and whose root is conical,cylindrical or spindle shaped.And its meat is rich in starch.Meanwhile,it is mainly used for food,feeding and industrial development and utilization.Cassava can be planted by cutting and pre-cutting.In the pre-cut type of sowing method,firstly,the stem of cassava should be cut;secondly,the stem of the cut cassava should be sorted,collected and bundled manually;finally,the stem of the bundled cassava should be seeded.The stem of the cut cassava after finishing and strapping requires a lot of manpower,and it is low efficiency,high cost,high labor intensity and long time.At present,the research about tapioca stalk arrangement,collection and baling device is almost in the blank stage,and the existing arrangement and baling machine cannot meet the demand of tapioca stalk arrangement and binding.Therefore,it is of great significance for tapioca stalk finishing and baling to design a device.In order to solve the above problems,combined with the characteristics of cassava seed stalk,this paper designed a device of finishing and baling tapioca stalk after cutting.Based on the analysis of the domestic and foreign development of sorting and bundling machinery,drawing lessons from the design of other similar crops sorting and bundling equipment,this paper analyzes the key points of different machinery and the application methods of relevant simulation technology,and carrying out the following main research contents:(1)The characteristics of cassava stem were analyzed.The agronomic characteristics of cassava stem were analyzed.100 stems were randomly selected from the cut cassava stem of No.205 in South China for the determination of physical parameters.The diameter of 91% of seed stems was between [15,34.9] mm.92% of the seed stem nodes were distributed between [9,20].The net redistribution of 92% of thestems was between [50,129.9] g.The compression mechanical characteristics of cassava seed stem were analyzed,and the minimum radial compression force of cassava seed stem was 273 N,the maximum radial compression force was 412 N,and the average compression force was 335.4 N.It provides a theoretical basis for the design of tapioca seed stalk finishing and baling device.(2)Overall design of tapioca stalk finishing and baling device.According to the design requirements of cassava stem sorting,bundling,and connecting with the working condition of the device,determines the cassava stem sorting,tying device overall design scheme of mechanical structure and control system design scheme,and introduced the cassava stem working principle of sorting,tying device,the device was established by applying the SolidWorks software 3D model.(3)Design of each functional unit of cassava seed stalk finishing and baling device.Through the determination of overall scheme of conveyer,sorting device,collecting device,tying device design,and the key parts of each device design and parameters,by using the SolidWorks modeling software,3 d model of conveyer,sorting device,collecting device,strapping device modeling.(4)Finite element analysis of key parts of the finishing device.The 3D part model was imported into ANSYS Workbench statics analysis module for its strength and deformation checking,and its key parts met the requirements.By modal analysis of the finishing device,the frequencies and corresponding modes of vibration under the first six modes are obtained respectively.The output frequency of the selected motor is less than all frequency ranges of the sixth mode of the device,so the whole finishing device will not produce resonance phenomenon when driven by the motor.(5)Topology optimization of key parts of the finishing device.In the connecting rod and push board under the premise of strength and stiffness meet the use requirement,respectively for the topology optimization design,through contrasting to the maximum total deformation before after optimization and the comparison of the maximum equivalent stress value,get the optimized the maximum total deformation value of the connecting rod and push plate and the maximum equivalent stress values are within the allowable deformation and allowable stress of material,so the topology optimization results meet the design requirements.After optimization,the mass of theconnecting rod and the push plate is also significantly reduced,and some redundant materials are removed,meanwhile,the optimization goal is achieved.