| 摘要 |
<p>The present invention relates to a metering process of a number of granular materials comprising the steps of:
a) initial calibration of a multiple metering device (DM) including the steps of:
- loading a number of granular materials to be metered into respective hoppers or silos (T 1 , T 2 , ..., T n ), each equipped with a respective extractor device (DE 1 , DE 2 , ..., DE n ) making up part of the multiple metering device (DM);
- separately driving each of the extractor devices (DE 1 , DE 2 , ..., DE n ), each associated with a respective hopper (T 1 , T 2 , ..., T n ), whereby carrying out a pre-established number of opening-closing steps in the time unit thereby obtaining a corresponding amount of extracted granular material;
- weighing the amount of granular material extracted by each extractor device (DE 1 , DE 2 , ..., DE n );
- inserting weight data for each granular material to be metered into a program control unit (CPU) for the calculation of the opening-closing period (P 1 , P 2 , ..., P n ) of each extractor device (DE 1 , DE 2 , ..., DE n ) based on desired percentages of each granular material to be metered, for the obtainment of a final mixture with desired composition; and subsequently
b) cyclic execution of the following sequential steps:
- sending control signals processed by the program control unit (CPU) as a function of said periods of extractor opening-closing (DE 1 , DE 2 , ..., DE n ) for the extraction of an metered amount of the respective granular material to be treated by at least two extractor devices (DE 1 , DE 2 , ..., DE n );
- collecting, in a holding container (CP), the metered amounts of each granular material thus extracted; and
- detecting, by means of sensor means (MS), a pre-established filling threshold of the holding container (CP) thereby stopping the at least two extractor devices (DE 1 , DE 2 , ..., DE n ) upon attainment of the pre-established filling threshold.</p> |
