| 摘要 |
<p>PROBLEM TO BE SOLVED: To save time and material costs for the preparation of concrete by providing a processor means which closes a valve means when a weighing means measures that a desired quantity of an admixture to be supplied had been charged into a concrete mixer. SOLUTION: The operation of a pump 44 is controlled by a processor 40. In a pump 44, flow meters 48, 50 of a pair for measuring the flow of an admixture 26 passing through a piping system for the admixture are connected in series. The flow meter 50 is connected with an electric valve 52, which is operated and controlled by the processor 40. The valve 52 is operated by the processor 40 corresponding to the quantity of the admixture 26 to be distributed to a mixing tank 14 according to the results of measurement obtained by the flow meters 48, 50.</p> |
