| 摘要 |
<p>1,125,698. Electric correspondence control systems. CENTRE DE RECHERCHES DE PONT -A. MOUSSON. April 13, 1967 [April 22, 1966], No. 16963/67. Heading G1N. [Also in Divisions F1 and G3] Pouring of a liquid L (Fig. 1) from a container A1 is controlled by regulating the gas pressure in the space above the liquid in the main part of the container via a valve 11 and entry aperture 7, the pressure being initially increased so that the liquid in the spout 1 is at the level N of the lip, adding a step increase in pressure to obtain a desired rate of pour, then increasing the pressure in inverse relationship to the weight of the assembly as measured at 13 to maintain the rate of flow. The weight signal at 13 is inverted at 14 and fed to a comparator 17, together with a signal from a pressure transducer 12, the combination producing an output signal which adjusts valve 11 so that the liquid in the spout 1 is at level N. Pouring is initiated by closing a switch 19a, e.g. a photoelectric switch operated by the presence of a mould, which adds a step voltage from control device 16 to comparator 17, whereupon the internal pressure is increased, and the liquid 2 overflows from spout 1. The rate of pouring, determined by the magnitude of the step voltage from 16, is maintained constant by varying the applied pressure in an inverse relationship to the change in weight sensed at 13. Pouring ceases when switch 19a is reopened. The container A1 may be refilled at any time during the operation, because of the automatic link between weight and pressure. In a modification Fig. 4 (not shown), the outflowing liquid passes through a detached length of conduit which is continuously weighed to determine the rate of flow, and this measurement is used to control the signal from control device 16 to obtain a desired rate of flow.</p> |
