Shelling Characteristics Research And Sheller Optimization For Scallops

In recent years,the production of scallops cultured in marine ranches has grown rapidly.Consumer market demand for scallop products is increasing year by year.The processing for scallops mainly includes:cleaning,shelling,quick-frozen packaging and other processes.Shelling is a necessary process for the production of scallop products.It is also the most important factor affecting the taste for shellfish.At present,there are many problems in scallop shelling process and equipment.For example,high labor intensity,poor shellfish quality and low shelling rate.It seriously hinders the further development of scallop industry.In order to assist the conversion of old and new kinetic energy in Shandong Province and promote the technological breakthrough for modern marine industry equipment,this thesis carried out the shelling characteristics for scallops and designs the shelling equipment based on the in-depth study of the shelling technology and equipment for double-shell shellfish at home and abroad.This thesis takes bay scallop as the research object.Build the measurement platform for binding force.Taking the binding force as the goal,the single factor and response surface experiment were designed to construct the multiple quadratic regression equation of temperature,bath time and scallop quality.According to the ANOVA,the regression equation has a high degree of fitting and can reflect the real experimental value.Further,it can be used to analyze and predict binding force.The optimum process parameters of scallop shelling were obtained by response surface optimization,which provided reference for reasonable selection of process parameters in actual production.Aimed at the needs of scallop shelling,a simple and efficient scallop sheller was designed by analyzing the advantages and disadvantages for existing shelling equipment at home and abroad.According to the overall structure of scallop sheller to establish three-dimensional model.Combined with the constraints and loads under actual working conditions,the static analysis was carried out to obtain the total deformation and equivalent stress distribution nephogram for sheller.The analysis results show that the maximum displacement and stress are far less than the allowable safety value for the whole structure.It is the stiffness and strength meet the design requirements.The buckling eigenvalue and buckling mode shape are obtained by buckling analysis,and the deformation and buckling position are determined when the instability occurs for the sheller.The results show that the sheller can meet the stability requirements.Based on the design requirements of stiffness,strength and stability for the sheller,the dynamic analysis is carried out.The first eight natural frequencies and modal shapes are obtained by modal analysis.Compared with the external excitation frequency,the results show that the sheller can avoid resonance.The harmonic response analysis under the excitation for vibration motor is carried out to obtain the frequency response curve for the sheller.According to the mutation point on the response curve,it is further concluded that the excitation frequency will not lead to resonance for the sheller.The transient analysis for vibration motor under impact load is carried out.Through the displacement and stress-time response curves in 0-1 s period,it is determined that the equivalent displacement and stress at the maximum time can meet the normal working condition requirements for the sheller.The finite element analysis results show that there is a certain optimization space in the design for the sheller.Through the lightweight design,the optimization results show that the mass is reduced by 4.16%compared with the original sheller.The strength,stiffness and stability for the optimized sheller were verified.The results showed that the overall mechanical properties are better than the original design structure.The optimization design realized the goal of reducing mass and optimizing performance.The application results of the trial-manufactured sheller in the production field show that 20～25 tons are processed per hour for scallops.The unshelled rate of scallops is controlled below 5‰,which can meet the requirements of mass production and quality for the enterprise.