APPARATUS FOR THE WEIGHTED DOSING OF GRANULAR OR PULVERULENT PRODUCTS

Apparatus for the weighted dosing in line and continuously of a granular or pulverulent product. It comprises continuous separated bands for the extraction and the dosing, wherein all of the dosing band is weighted and the rate of the extraction apparatus is servo-controlled to the instant measurement value of the charge of the product distributed on the dosing band, and comprises: a) a storage hopper (2) for the product to be dosed (1) under which there is arranged a continuous extraction band (3) of which one of the support drums (5A, 5B) is susceptible of being driven at variable speed by a motor reducing assembly (4), b) a dosing unit (8) arranged under and in line with the extraction band to receive the extracted product, and comprised of a tee-shaped fixed support frame (9) provided at its extremities with posts (10A - 10B - 10C) supporting three strain gauge flexion balances (11A - 11B - 11C) to which is entirely suspended by means of flexible cables (12A - 12B - 12C), an extra light tubular structure (13) and of an endless belt (15) of which the rollers (14A - 14B) are supported by the structure and of which one of the rollers (14A) is acceptable of being driven at variable speed by a motor reducing unit (16). The dosing apparatus also comprises an electronic regulation chain F1-F2 between the motor reducing unit driving the belt of the doser and the motor reducing unit of the extraction apparatus which is such that the drive speed of the extraction belt is servo-controlled to the instant load of the doser belt. Application to the industry of fertilizers. Appareil de dosage pondéral en ligne et en continu d'un produit granulé ou pulvérulent. Il comporte des bandes continues séparées pour l'extraction et le dosage dans lequel on pèse l'intégralité de la bande de dosage et on asservit la vitesse de l'appareil d'extraction à la mesure instantanée de la charge de produit réparti sur la bande de doseur, et comprend: a) une trémie de stockage (2) du produit à doser (1) en-dessous de laquelle est agencée une bande continue d'extraction (3) dont l'un des tambours de soutien (5A, 5B) est susceptible d'être entraîné à vitesse variable par un ensemble motoréducteur (4); b) un ensemble doseur (8), disposé en-dessous et en ligne avec la bande d'extraction pour recevoir le produit extrait, constitué: d'un bâti support fixe en forme de té (9) muni à ses extrémités de piliers (10A - 10B - 10C) supportant trois pesons de flexion à jauges de contrainte (11A - 11B -