Research On The Key Technology Of UHP Continuous Sterilization Equipment

Compared with traditional thermal processed food,Ultra-High Pressure processed food not only retains the color and flavor of the food,but also maximizes the original nutrition of the food in the processing.At present,the commonly used Ultra-High Pressure food processing machine is generally intermittent and semi-continuous equipment,which has many defects such as low efficiency,low output,and large energy consumption.In order to improve the processing efficiency and reduce energy consumption of UHP processing equipment,a new UHP continuous sterilization equipment was designed according to the specific requirements of UHP processing and its key parts were studied in depth in the dissertation.The main research contents of this thesis are as follows:Firstly,to control the problems existing in the technological process of the existing UHP sterilization equipment,the technological process of the UHP continuous sterilization equipment was worked out.The technical process drawing of the continuous sterilization process was mapped out.The energy consumption of UHP continuous sterilization equipment was analyzed.Secondly,the structure design of the whole machine of UHP continuous sterilization equipment was completed.Theoretical calculation was carried out on the silo entry-exit mechanism,silo locking mechanism and pressure loading frame.Theoretical calculation was carried out on the working section of the pre-stressing steel wire wound cylinder and the split cylinder in the UHP sterilization cylinder to meet the working requirements.Thirdly,the maximum stress and maximum deformation of the key parts of the silo entry-exit mechanism are studied,and the significance of the influence of the change of the parameters on the stress and deformation is obtained based on the orthogonal experiment.On this basis of above studies,the lightweight of the silo roof is completed.The influence of material size on the maximum stress and deformation of the shear surface of the clasp of the key parts in the silo lock mechanism was studied based on the orthogonal experiment,and the significance of the change of the parameter level on the stress and deformation was obtained.The optimization of the clasp was also completed based on above studies.Fourthly,according to the theoretical calculation formula above,the calculation results of radial stress and circumferential stress at different positions of the split cylinder in the pre-stressed and working state are obtained respectively.And the results are mostly consistent with the finite element simulation results.At last,the similarity relationship between the original model and the similar model of the silo locking mechanism was completed based on the similarity theory.The simulation of the original model and the similar model was carried out by using the finite element software.And the maximum stress,strain and deformation cloud maps of the two models were obtained.The results verified the accuracy of the similarity relationship.The specimens of silo locking mechanism were processed and loaded according to the similarity relationship to verify the stability of silo locking mechanism under working conditions.