

制袋机通常具有两种封切方法:空白袋定长封切和寻标封切,当挑选空白袋定长封切时色标光电眼不起作用,PLC程序依据切袋长度、机械传动比、伺服驱动器的电子齿轮比、伺服电机编码器的线数以及送料辊的周长,计算出伺服体系定位所需求的脉冲数,然后由驱动器驱动伺服电机股动送料辊滚动送出必定长度的胶袋,从而完结白袋定长封切;当挑选寻标封切时,其进程如下,伺服发动信号导通,伺服电机按照PLC程序预先设定的运动曲线进行加速运动、恒速运动、减速运动、低速追色,如图3所示,PLC接收到追色信号时,经过中止方法立即停止伺服电机。通常追色长度为10mm,而且请求追色信号只能在追色范围内起作用,其它范围内需屏蔽掉其搅扰信号。追色封切调试时,在人机界面上设定好伺服电机的恒速速度,先将加速时刻、减速时刻设长,再调低速追色速度,尽也许进步低速追色速度,以追色平稳、精确为准。调整好追色速度后,再调加速时刻、减速时刻,尽也许调短加减速时刻,以胶袋与出料辊不发生相对滑动及追色平稳为准。PLC程序在追色封切时,对追色信号记数,接连三次检查不届时,PLC停止各电机作业,并驱动报警器报警。一起PLC程序对批量记数,当批量到达预警值时,PLC驱动报警器报警提示。

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