The Study On Interface Technology Of Polyurethane Foaming Machine

Module division and interface design are the key parts of modular design.However,there are few researches on the method of module division and interface design of polyurethane foaming machine now.Therefore,this paper proposes a method of module division,which can be used in foaming equipment.In addition,based on the results of module partition,the method of designing interface is studied,and the general steps of interface design is defined.Using this interface design method,the interface between the metering pump module and the rack module as well as the pipeline interface of the flow meter module are designed and studied,which verifies the feasibility and the rationality of the method of designing interface and perfects modular design of polyurethane foaming equipment.(1)According to the formula of analytic hierarchy process and total contact strength,the design structure matrix of the parts of the metering unit of the foaming machine was calculated and constructed.The design structure matrix was imported into DBSCAN algorithm for calculation,and the module division of the metering unit of the foaming machine was realized.By calculating the module degree of each module division scheme,the optimal module division scheme is obtained.The metering unit of foaming machine is divided into six modules:metering pump module,pressure sensor module,flow meter module,pump safety valve module,rack module and flange cover module.(2)This paper expounds the interface design method of foaming machine in detail,makes the general steps of interface design clearly,strictly follows the interface design method that proposed in the paper,completes the design of the interface between the metering pump module and the rack module and the pipeline interface of the flow meter module,and verifies the feasibility of the interface design method of foaming machine.(3)Finish the last step of interface design method of foaming machine-interface performance research.Through the finite element simulation of the two interfaces,it is proved that the interface can satisfy the normal work of the foaming machine,and the rationality of the design method of the foaming machine is also verified.(4)By means of orthogonal experimental design,the interface between the metering pump module and the rack module is optimized.It is concluded that the greatest influence on σmax is the width of the left reinforcing bar,while the greatest influence on the quality is the thickness of the bottom plate and the thickness of the middle plate.Finally,the final optimization scheme of the interface is determined to be A1B2C4D4 combination.Comparing with results after the optimization,on the premise of meeting the working requirements of the interface,the optimized interface σmax only increased by 0.6908MPa compared with the previous,and the quality decreased by 16.24%compared with the previous.(5)Through eight groups of experiments,the flow rate of the foaming machine at the time of 2 seconds and 4 seconds were tested respectively,and the measurement accuracy of the measuring unit was calculated according to the relevant formula.The experimental results show that the measurement precision can meet the accuracy standard when the measuring unit works with the interface designed in the paper,and the feasibility and rationality of the interface design method of the foaming machine are also verified.The research shows that:(1)The module division method that combines DSM and DBSCAN algorithm can be applied to the modular design and research of polyurethane foaming equipment.(2)The interface design method of foaming machine that proposed in this paper can be divided into 7 steps,including module division,interface characteristics analysis,interface base type determination,interface parameters serialization,interface coding,interface performance research,which can be applied to the interface design link of foaming machine modular design.(3)The interface between the metering pump module and the rack module meets the strength requirements and does not produce resonance to affect the normal operation of the module;The pipe interface structure of the flow meter module meets the strength requirement and has good sealing performance.