Search

Aiming at the current computer jacquard knitting circular weft machine, there is a problem that the pattern data transmission is slow and the accuracy is low. When there is repeated call of the same pattern data, there will be a problem that the fabric structure is different. And the system cannot be woven continuously after power-off. A pattern data research scheme of the computer jacquard knitting circular weft machine is proposed. The solution adopts dual-port RAM technology, FSMC technology and GPMC technology to realize high-speed and accurate transmission of pattern data. In this paper, the power-off technology of the circular weft machine is discussed in depth, and the key hardware circuits and software algorithms are designed. The article deeply studies the knitting process and pattern data information, and customizes the special pattern. The results show that the pattern data processing technology realizes the fast and accurate data transmission, and when the system is powered off, the current knitting information is not lost. This technology improves the stability of the computer jacquard knitting circular weft control system

Aiming at actuality, seamless underwear machine has number of solenoid valves control points. Solenoid valve control point has a higher short circuit probability because of the quality problem of Solenoid valve. Through summarizing the performance characteristics and working requirements of each solenoid valve, the paper puts forward a kind of valve group control technology solution based on CAN bus. According to the position distribution of the valve group on the seamless underwear machine, the overall implementation method of the control technology is constructed. The key hardware design and software design are elaborated, and the CAN bus communication protocol is established. In order to avoid the occurrence of situation that valve control circuit is damaged due to short circuit of solenoid valve, a solenoid valve overcurrent protection method is proposed. The article improves the real-time and accuracy of the technology by deeply studying the working characteristics of the solenoid valve control points and combining the test data. The results indicate that this technology achieves the accuracy of the valve control action. At the same time, the safety of the underwear machine control system is improved to meet the seamless underwear machine control requirements for the valve group

The method of orthogonal projection is introduced according to the problem of feed forward parameter optimization in linear servo system with high frequency response. At first, orthogonalized basis functions are constructed and the control system is projected onto the axes of the basis functions. Then system parameters are identified along the axes of basis functions by iterative learning and high speed response are compensated by feed forward. The method extends the iterative learning from time domain to the space of orthogonalized basis functions. The simulations and experiments show this method can significantly improve the tracking and high-response performance of linear servo system and meet the high speed and high precision requirements.