采用高速串行总线的圆纬机选针驱动器设计

Needle drive design of circular weft knitting machine based on high speed serial bus

目前针织机械用压电陶瓷选针器都采用并行总线结构组网控制,提出了一种基于RS-485高速串行总线的选针驱动器设计方法。在一条波特率为4 M的RS-485总线上,并联多个基于RS-485总线的数字选针器。设计一主多从的多节点总线架构和总线仲裁机制,实现主机和从机间的相互通信。测试结果表明,这种控制方法能解决目前长线传输效应较易产生的信号间相互串扰,抗电磁干扰性能差,提花编织控制时容易出现错花等不稳定现象,满足选针实时性要求,可提高数字选针器的稳定性。

Currently the knitting machine of piezoelectric ceramic actuators are connected with a parallel bus network. This paper puts forward a needle selector control method of RS-485 based on high speed serial bus. At a baud rate of 4 M on the RS-485 bus, multiple digital needle selectors based on RS-485 bus are parallel. In order to achieve the communication between host and slaves, multi-node bus structure and bus arbitration is designed. The test results indicate that this method can solve the phenomenon of the parallel bus transmission disturbance when the speed is higher and the distance is longer. Also the phenomenon of some instabilities of needle selectors can be solved. This method meets the real-time requirements and improves the stability of digital needle selector.