Study On Key Technology Of Mussel High-pressure Water Jet Cleaning

Mussels are one of the main economically cultivated shellfish in China.There are a lot of calcium deposits,sludge,barnacles,and foot silk plates on the surface of mature mussels,which need to be cleaned and removed before being sold on the market.A clean source of mussels is the premise to ensure the safety of mussel food,and it is also a difficult problem to be solved in the development of refined processing of mussels.At present,the cleaning of mussel surface shell dirt mainly includes vibration cleaning,roller scrubbing,manual brushing and other methods.These methods generally have problems such as high shell crushing rate,poor cleaning effect,and large water consumption.Based on the problems existing in the current cleaning method of mussels,according to the structural characteristics of bivalve shells and the technical advantages of high-pressure water jet cleaning,this thesis proposes to use high-pressure water jet technology to clean mussels surface shells.A high-pressure water jet cleaning equipment for mussels has been designed,which can be used in combination with existing mussel dispersal equipment or as a standalone device.The equipment can be used in combination with the existing mussel dispersal equipment or as a single machine.The research content of the thesis mainly includes the following parts:(1)Theoretical analysis of high-pressure water jet decontamination.Firstly,the three-dimensional model of the shell is obtained by reverse scanning modeling,and the static force analysis of the obtained model is carried out;Then the pressure test of mussel shell was carried out and the crack extension coordinates were calculated;Finally,through pressure bearing tests and simulation results,the pressure bearing capacity,crack distribution pattern,and optimal stress attitude of the shell are determined.Analyzing the mechanism of high-pressure water jet cleaning for mussels and the influence of basic parameters such as jet pressure,target distance,and incidence angle on jet cleaning effectiveness can provide reference for subsequent jet simulation,cleaning experiments,and equipment structural design.Finally,through the crack extension coordinates and the simulation results,the pressure bearing capacity,crack distribution law and the best stress attitude of the shell are determined.(2)Numerical simulation of fan nozzle jet.Taking the nozzle injection angle,nozzle equivalent diameter,jet pressure,target distance,incidence angle and nozzle layout spacing as simulation variables,30 sets of simulation examples are designed.The fluid domain models of each simulation example are modeled by Solidworks software.The simulation is performed by Fluent software after meshing and parameter setting.The simulation results,theoretical calculation results and actual measurement results are verified and compared,Finally,the optimum nozzle structure parameters and jet cleaning parameters for mussel jet cleaning are determined.(3)High-pressure water jet cleaning test.Set up a high-pressure water jet cleaning experimental platform,and verify the nozzle structure parameters and jet cleaning parameters obtained by simulation.First of all,carry out single factor test verification to determine the factors and level range of multi-factor test;Then carry out multi-factor test,and design the test scheme according to the Box-Behnken test design principle;The results are modeled mathematically,and the influence of single factor on jet impact force and jet impact pressure is analyzed;Finally,Box-Behnken response surface method was used to further optimize the cleaning parameters,and the optimal parameters of mussel jet cleaning were obtained.(4)Design and simulation of high-pressure water jet cleaning equipment.According to the characteristics of crack extension of mussel shell and the technical requirements of jet cleaning parameters adjustment,the structure of mussel highpressure water jet cleaning equipment is designed and modeled using Solidworks software.Carry out finite element static and dynamic simulation analysis on the jet parameter adjustment device and frame of the equipment to verify the possibility of its stable operation.