PELLETISERINGSKONTROLL.

摘要

A method and apparatus are provided for controlling the amount of dry particulate matter and liquid added to a rotary pelletizer. A transducer placed within the pelletizer senses a characteristic of the mixed material in the pelletizer. This characteristic may be, for example, the level of the batch or the size of the pellets. The transducer signal is then conditioned to provide a signal level corresponding to a desired characteristic level and which varies about that level corresponding for example to the variations of pellet size about a desired size. That signal is added to a second signal representing the actual liquid flow into the pelletizer or added to a second signal representing actual dry particulate flow into the pelletizer and modulates that respective flow to maintain the input of either the dry or the liquid material into the pelletizer as necessary. Additionally, a set point signal can be provided as a constant signal representing desired dry particulate in flow or liquid in flow. The dry or the liquid signal also can be derived from the respective actual liquid or dry signal by taking a proper proportion of the other signal. Additionally, a method and apparatus is shown for controlling the liquid input to the pelletizer in response to the actual dry material flow into the pelletizer so that the correct proportion of liquid to dry particulate is always maintained regardless of the actual flow.