| 摘要 |
<p>The invention discloses a net weight weighing device for bagging machines wherein the container (2) connected to the weighing device (10) is loaded with a quantity of material higher than that of a preset weight and the material is discharged in the bagging machine (1) through a valve (3) controlled in such a way as to have three positions: a fully open position, a reduced flow position and a fully closed one, the discharge operation being controlled during its entire cycle by a microprocessor which, after having stored the value of the weight of the material existing in the container (2) of the weighing device, when a bag is present on the loading nozzle (9) of the bagging machine (1), causes full opening of the discharge valve (3) of the device container (2), and controlling the weight reduction of the material in the container, when the desired weight of the material in the bag is nearly reached, causes first the partial closure and then total closure of the valve (3) when the weight is reached, said closure steps taking place when to the total net weight are missing quantities, which were predetermined in advance through tests made as a function of the type of material to be bagged and were stored in the microprocessor.</p> |
