| 摘要 |
<p>The vessel (2) has a valve working downward for the material delivery, and a closing element with several selectable stages corresponding to different flow velocities. A control device regulates the position of the valve, so that a required weight of the material is delivered to the vessel in accordance with a specified program; it has one or several load cells which deliver an electric signal corresponding to the weight of the vessel with its content, and a comparator comparing signals from load cells with a specified required by the program weight; an error signal indicates the instantaneous additional weight required; a control device responds to the error signal and gradually sets the valve to lower flow velocities.</p> |
