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有些机器制造者通过继续改进机器的正常运行时间来实现自动化升级,以摆脱近期碰到的困惑。处于高竞争性的软饮料产业中的OEM商们意识到:正常运行时间不仅对成功起着至关重要的作用,而且是必不可少的。一小时的停工时间可能导致数万美元的损失。
一般来说,应用于高速瓶装产业的堆垛机是液压驱动的。由于任何基于液压驱动的控制都存在着旧机器泄漏的危险,在这种情况下,增加了饮料被污染的潜伏可能性。
葫芦/吊轮在堆垛过程中举起大货物,它被以为是堆垛机中最重要和最危险的部分。很多电动和液压的堆垛机有个题目,即设计无法保持连续和精确地控制葫芦。结果,这些葫芦有可能失往控制而使整个货物掉落下来。除了安全题目外,这些事件还可能导致丢失产品,较长的停工清洁时间,甚至更长的机械维修时间。
一些瓶装商正经历一天好几次掉落货物的现象,-一些则一个月才出现这种现象。他们与T-TEK、Montgomery、Ala.堆垛机制造商联系并寻求帮助。不论这种现象是零星发生,还是惯常的,这些瓶装商们寻找一种可靠的起重控制系统,以消除缺点、失误和停工期。
T-Tek公司副总裁Brian Traff,以为这是一个机会,可以在堆垛机上用一种电气系统代替现存的液压系统,他说,很多机器生产者都犹豫做改变,由于以前在灌装产业中,电气系统被以为不可靠。Traff说:“T-Tek的控制设计中有一个关键要求:它决不答应货盘从吊轮上落下来。”
在评估一系列用于起重机控制的交流驱动器后,Traff选择了Rockwell Automation,该公司的1336再生驱动器答应由堆垛机产生的过剩再生性能量循环转化为能有助提供灌注生产线动力。这些驱动器也有助于消除来自动力制动器电阻的剧烈热源。“由于驱动器更友好、合乎环境要求,并且节约了可测得到的能量本钱,T-Tek电动堆垛机成了终端用户的最满足的解决方案。”Traff说。
这种驱动器适合T-Tek的需要,使它的堆垛机有了一个编码器和一个闭环系统。编码器答应驱动器为电动机提供150%的扭矩,并使葫芦即使没有制动也可保持零速—甚至在满载货物时。这就造就了一个完全真实的电动堆垛机系统。
“所有堆垛机上的电气控制系统被证实对顾客是一个彻底的成功,”Traff说,“我们的电动堆垛机很少有停机报道的例子。和液压系统比较,产品箱子堆叠得更干净,而且全电气堆垛机的减速过程运行得更平稳。”
Traff以为,新驱动器技术的升级非常值得,但是他也知道:“我们的客户不总是控制技术的早期适应者,但我正尽力推进一点。”
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