| 摘要 |
11. An arrangement for providing sensitive and reliable detection of blockage in airflow distribution outlets in which the distribution head includes a main conduit with the secondary conduit radiating from this, the arrangement being such that normally grain and superphosphate will be directly diverted without impacting a target face into the secondary conduits but with any blockage occurring in any of the secondary conduits this uniform flow is upset with resultant increased impact against the target face. There are detector means such as a microphone located behind the target face to provide a detection signal upon increased impact occurring. |
