Research On Deep Processing Equipment And Drying Technology For Jujube

At present,the processing technology of jujube is comparatively backward in our country,and the traditional manual or semi-automatic jujube pitting,slicing technology can’t satisfy people’s needs.In addition,the study found that the quality of dry product of jujube by hot air drying is lower generally.With the improvement of living standards and development of production technology,people put forward more requirements towards the deep processing equipments and the quality of dry product of jujube.Therefore,the research of deep processing equipments and drying technology of jujube have important practical value.Aiming at the main problems existed in deep processing equipments of jujube in our country,with analysing the relevant information,the exploration and development of feeding,pitting,slicing technology,cryogenic vacuum drying technology and process of jujube have been carried out,which are based on studying the processing principle and integration technology of jujube.Some researches in regard to many aspects of the deep processing equipments and drying process of jujube have been done in the thesis,which includes the schematic design of pitting and slicing integration equipment for jujube,control system design of equipment,design calculation and motion simulation of the key components,the adjustments and tests of equipment,study on cryogenic vacuum drying processes of jujube slices.The main research contents include:(1)In response to the demands of jujube processing enterprises on pitting,slicing equipments performance and technology,the overall schematic design of the pitting and slicing integration equipment for jujube is put forward,which are based on analysing the existing equipments,and the mian mechanisms are designed detailedly.Then,the 2D graphic drawing and 3D modeling assembly of the whole machine and other major components are completed,with using the UG,AutoCAD and other softwares.(2)According to the process principle of this equipment,the motion chart of each mechanism is calculated and drawn,and the whole working circulation chart of the equipment is further determined.With this combination,the research on control objectives and tasks are made clear.By using the CPAC and other electrical devices,the design of man-machine interface and preparation of related programs are completed in programmable software OtoStudio meanwhile,so the control system of the pitting and slicing integration equipment for jujube is developed and designed finally.(3)The dynamic parameters of drive systems in major mechanisms of the equipment,such as pitting and slicing mechanism,are calculated.Then the key components of the equipment are made static analysis and fatigue analysis by using the ANSYS Workbench software.After that,the motion simulation and coordination analysis of the pitting mechanism of this equipment have been completed by using the ADAMS software.Besides,the motion simulation of other major mechanisms and whole machine also have been finished separately.Thus all of that can prove the rationality for the design of whole machine.(4)The relationship between motor speed and each of them which are accuracy of feeding,pitting breakage rate,slicing breakage rate,is researched by testing the prototype.In addition,by debugging control system,with using the travel switch,the pitting plate can rotate more accurately.Synthesizing above all testing outcomes,the best working conditions of the major components of the integration equipment are determined.Besides,the reliability of whole machine is verified through test experiments with whole machine.(5)Using the pitting and slicing integration equipment for jujube as processing equipment,the effects of vacuum degree,material thickness and drying temperature on drying characteristics of jujube slices are explored through single factor experiment.Based on that,choosing drying time,rehydration ratio and Vitamin C content as quotas,the influences of cryogenic vacuum drying parameters on quality of jujube slices have been studied through orthogonal experiment,therefore the optimum process parameters are obtained.