Research On The Structure And Performance Of Super-Wide Width Electromagnetic Weft Insertion Mechanism Based On Multi-Field Coupling

Super-wide width industrial fabrics can be used in aerospace,water conservancy and coastal defense,construction environmental protection projects and other fields that require large-area industrial fabrics due to their integral molding.How to insert weft in a high-speed,stable and reliable way is an urgent problem to be solved for super-wide width high-speed weaving equipment for industrial textiles.The existing weft insertion methods for looms are difficult to meet the force and speed requirements for weft insertion of super-wide width and high-speed looms due to limitations in principle,and new weft insertion methods need to be explored.With the rapid development of electromagnetic emission technology and pulse power control technology of electromagnetic emission system,electromagnetic launch weft insertion was proposed.Based on this,our research group proposed a segmented combined electromagnetic launch weft insertion scheme,which further improves the electromagnetic force and stability of the weft insertion device,which is conducive to improving the quality of fabric weaving.On the basis of this research,this paper conducts an in-depth study on the dynamic control mechanism of segmented combined electromagnetic launch weft insertion.The specific work is described as follows:(1)The principle and structure design of super-wide width electromagnetic weft insertion.The composition,working process and working principle of super-wide width electromagnetic weft insertion are introduced.According to the Biot-Savart law,the virtual displacement method is used to establish the theoretical model of the electromagnetic force of the weft inserter and the optimization model of the DC excitation single-stage coil structure.The effects of wire arrangement in different directions,wire gauge,magnetization characteristics of ferromagnetic materials,and coil aspect ratio on gradient magnetic field and electromagnetic force are analyzed.The feasibility of the coil structure optimization method targeting the average electromagnetic force and the gradient magnetic field is verified.(2)The establishment of the dynamic prediction model DPMSCEI of the multi-stage coil combined electromagnetic launch weft insertion.According to the dynamic electromagnetic force distribution characteristics of the weft inserter when it moves inside the transmitting coil and the technological requirements of the super-wide width weft insertion acceleration process.Combined with the control logic of segmented combined electromagnetic launch weft insertion,the electromagnetic force model of the weft inserter under the segmented combined control mode is established.Considering the weft yarn dynamic tension,air resistance,pipe wall friction and gravity during the movement of the weft inserter,the electromagnetic force,flight speed and coil temperature rise of the weft inserter at different positions are predicted.The relative error between DPMSCEI prediction results and finite element simulation results is within 4%,and the running speed is increased by 8000%,which is beneficial to the dynamic feedback control of high-speed looms.The built-in temperature rise algorithm can calculate the heat generated by the device,which provides convenience for subsequent device heat dissipation and reliability analysis.(3)Structural design of super-wide width electromagnetic launch weft insertion brake and energy recovery device.The energy recovery device of spring plus solenoid valve and spring plus suction cup is designed,and the law of mutual conversion between kinetic energy and potential energy is analyzed according to the law of energy conservation.The energy conversion model of weft inserter,slide block and spring is established according to the centering positive collision theory.A simulation model was established to verify the possibility of the system in terms of energy recovery and weft yarn transfer.(4)Segmented combined electromagnetic launch weft insertion experiment.Using STM32F103ZET6 as the controller,optocoupler isolation control circuit and drive circuit,combined with the characteristics of IGBT positive voltage on and negative voltage off,design the acceleration coil drive circuit array,and build a 9-level electromagnetic launch weft insertion platform symmetrical on both sides.The status of the infrared sensor module introduced is FLAG,which is used to judge the winding energization mode,and realize the electromagnetic loop launch weft insertion under laboratory conditions.According to the principle of mechanical balance and the principle of infrared sensor trigger capture,the electromagnetic force measurement and speed measurement platforms of the weft inserter are respectively built.The results of the experimental platform have confirmed the advantages of the segmented combined electromagnetic launching weft insertion and the feasibility of using DPMSCEI for power control of the weft inserter.