Research On The Weaving Process And Control Realization Of Jacquard Stockings Machine

Jacquard stocking machine is a kind of seamless forming knitting equipment,which is used for knitting high-end stockings products.Domestic clothing manufacturers have a strong demand for medium and high-end stockings machines.The jacquard stockings machine has the characteristics of high running speed,special structure,complicated process,and difficult electrical control.There is no thorough research on the knitting process and control technology of this type of high-end models in China.Most of the domestic jacquard stocking machine equipment comes from the digestion and absorption of foreign technology.The stability,automation level and knitting efficiency of its electronic control system are far from the advanced foreign equipment.With the expansion of the stockings market and the requirements of industrial upgrading,research on the knitting technology and control technology of the jacquard stockings machine has important theoretical value and engineering guidance significance.Based on investigating the development status and technical status of advanced jacquard stocking machines at home and abroad,this paper summarizes the structural principles and process characteristics of key knitting mechanisms of jacquard stocking machines,and analyzes the relationship between the knitting process and each knitted component.For various types of typical actuators such as servo motors,needle selectors,stepper motors,and solenoid valves for jacquard stocking machine equipment,their working principles and control methods are analyzed,and their working characteristics and process requirements for control need to be met.Based on this,a real-time control system scheme for jacquard stocking machine is proposed.This scheme uses a three-level hierarchical structure to divide the entire control system into three levels:interactive level,control level,and execution level.The serial bus performs data interaction and instruction transmission,and has significant advantages in real-time,scalability,and reliability.Among them,the interaction level is based on RT1052,the domestic RT-Thread operating system is transplanted to implement multi-tasking,and the emWin graphics library is used for human-computer interaction interface design.In view of the large number of calculation and processing tasks at the control level,a high-performance ARM microcontroller with Cortex-M4 core is used to implement the core tasks of weaving control.The method of adjusting the knitting speed and the algorithm of needle position calibration based on zero compensation are described in detail.The control level main controller adopts a distributed bus structure to connect with each drive module of the execution level,which enhances the scalability of the system and facilitates the modular design of various drive actuators.According to the working principle and characteristics of various types of actuators,the corresponding drivers were developed and the control scheme was optimized.The solenoid valve drive control adopts the PWM hold mode and implements fault detection;the needle selector uses the magnetically-maintained needle selector based instant magnetization scheme,and realizes the working state detection;the stepper motor uses a half-current working mode and S-type acceleration and deceleration algorithmExperimental tests and practical application results show that the jacquard stocking machine control system studied in this paper has strong real-time performance and good integration,and various drive modules have excellent working performance,which can fully meet the control requirements and process requirements of high-speed operation of the jacquard stocking machine Engineering application value.