一些经验教训的艰难方式可能会帮助刚刚收到自动化或调整包装线的任务的人，并且还没有经验。
首先，我建议自动化工程师学习线上机器的“个性”。某些机器可以很好地循环，而其他机器可以比停止和启动更优雅地处理速度变化。一些机器，例如一定量的背压（在输液输送机上排队的容器），以提高侵蚀可靠性。在开发行控制逻辑方案时，可能还会考虑任何给定的机器的其他怪癖。
Speed adjustments can have a unique set of challenges to deal with. For example, if glue is being applied to some raw material such as a winder, then how should the glue be managed? It might seem obvious that the glue rate should be simply slowed down in a linear fashion to match the percentage reduction in the speed of the line. Well, I can tell you that what seems obvious isn’t always the case. If the material is paper, that can absorb the glue, and then the glue rate has to actually increase rather than decrease. If the material is something that doesn’t absorb the glue, then I suspect the linear reduction in rate to coincide with the line speed would be a good place to start. If there is some sort of registration marker on the material to facilitate pattern matching on the finished container, and then the line is slowed down, there probably needs to be some adjustment to the timing between when the registration marker is detected and another event such as a cutoff is triggered. In some cases, that timing resolution needs to be more accurate than the timing of a programmable logic controller (PLC) scan can accommodate. In one case, I recall that we had to actually mount the sensor to a mechanism driven by a stepper motor so that we could adjust our timing resolution by simply repositioning the sensor (much like shooting skeet).
包装线是否涉及任何形式的积累？从输送机到垂直蓄能器的积累设备有多种形式。速度可能是累加器管理的问题，也可能不是一个问题。如果您要进出来管理累积输送机中的队列水平，那么一个问题是您是否有足够的传感器时间让PLC捕获每个容器。可能需要高速计数器以确保可以保持准确的计数。在垂直蓄能器的情况下，您在容器之间有多少间隙，垂直蓄能器插入停止然后提高包装集合的反应时间是多少？
What about package degradation? How long can you allow the conveyor to run under a stationary batch of containers without damaging the appearance of the package? Is that something that you need to manage? Do you need to synchronize the management of that conveyor with the infeed of the adjacent machine?
There are some filling lines that have multiple stations (coarse, medium, fine) in order to actually get all the material into the container. In powders that are aerated, a vibratory transfer between coarse to medium and then medium to fine allows the material to be settled sufficiently such that the target weight can be obtained within the volume provided by the conveyor. In such an arrangement, I suggest using a one-shot to ensure that a container fill cycle gets started at the proper time so as to ensure a complete filling cycle. If the container isn’t in place at the proper point in the cycle, then you will most likely have a partially filled container and a reject at the check-weigh scale. If you don’t start with a “late” container, then all you have to deal with is an empty container instead of a container partially full of product.
希望这些提示中的一些将证明是有帮助的。
雷·单身汉是董事会主席Bachelor Controls Inc.，一名认证成员控制系统集成商协会（CSIA）。有关单身汉控件的更多信息，请访问其个人资料工业自动化交换.
