Research Of Optimization For Mixing Proportional Pump Of Non-Solvent Laminate

Non-solvent laminate technology is widely used in flexible packaging industry because of its unique advantages such as economy,safety and environmental protection.The non-solvent laminate glue mixer is the key equipment in the non-solvent laminating process.Its function is to mix the two components of A and B in two component glue in a certain proportion for uniform mixing.The non-solvent laminate mixing proportional pump is usually made up of gear pump.The basic requirement of the mixing process is to ensure the precise mixing control.Due to the working principle of gear pump,a certain flow pulsation will be produced at the outlet of gear pump.In the process of mixing,the flow pulsation of gear pump will directly lead to the incorrect mixture ratio,which leads to the quality problems of compound products.In order to reduce the flow pulsation in the working process of the mixing proportional pump,to ensure the accuracy of mixture ratio and to improve the performance of the mixer,the main work is done as follows:(1)Based on the theory of gear engagement,the forming way of involute is analyzed,and the involute tooth profile equation is obtained.On the basis of "scavenging area method",the mathematical model of instantaneous flow calculation of involute gear pump is reestablished,and the calculation formula of instantaneous flow rate at the outlet of involute gear pump is derived,which provides theoretical support for analyzing the flow pulsation of involute gear pump.(2)The forming mode of "linear circular rack conjugate tooth profile" of double circular are gear pump is studied and analyzed.The tooth profile equation is derived through the conjugate principle of gear rack,and the mathematical model of the circular arc gear pump is established.The calculation formula of the instantaneous flow rate at the outlet of the circular arc gear pump is deduced,and the factors that produce and influence the flow pulsation of circular arc gear pump are analyzed to provide objective function for gear profile optimization.(3)An optimization model based on objective function of gear pump flow pulsation coefficient is constructed.The range of the number of teeth Z in the design variables is given according to the design specification of the circular arc gear pump.The constraint boundary of the modulus m in the design variable is calculated by the bending strength criterion of the tooth root of the double circular arc gear,and the pressure angle a of the circular cylinder in the design variables is determined with the requirement of the meshing efficiency of the double circular arc gears,and then use geometric figure to explain the optimization problem of nonlinear programming,and get the optimal solution for the objective functionδQ(X).Finally,the basic parameters of the gear are given under the optimal solution.(4)The experimental platform of the circular arc gear pump flow is built,the instantaneous flow collected in the experiment is drawn into a flow curve,which is contrasted with the flow curve calculated from the theoretical model.Obtaining the relative precision of the theoretical model to verify the correctness of the theoretical model;And which is contrasted with the instantaneous flow monitoring curve under Fluent digital simulation to checkout the flow performance of the gear pump after optimization.(5)Taking a certain type of circular arc gear pump produced by Rui Qun company as a case,the kinematic and dynamic simulation analysis of two kinds of gear teeth gear of this type of gear pump is made respectively.The tooth profile of the circular arc gear is modified and improved in the condition that the basic dimension parameters of the gear are constant,and improved the force situation of gear meshing.