| 摘要 |
<p>The invention relates to an apparatus for automatically weighing a bulk product of particle-like material such as grain for example with a set weight, provided with a weighing bunker, automatic supply and discharge means for feeding the particle-like material to and from the bunker respectively, weighing means for the weighing bunker provided with a number of electromechanical load cells on a number of suspension points for detecting the weight of the weighing bunker and for giving an electrical signal which is proportional to the force exercised on the load cell and which signal is used for controlling the supply and discharge means, and in which weight-checking means are present for checking the correctness of the measured values given by the load cells (17) for the final determination of the total weight of the weighing bunker. A particular characteristic of the invention is that the check-weighing means are secondary electromechanical load cells (19) the electric signal from which is compared by a comparator (30) with that from the primary electromechanical load cells (17) and the resulting signl is used for controlling (32) the supply and the discharge means. Preferably, a series of combined units (1) of primary and secondary electromechanical load cells (17, 19) are mechanically and serially mounted at a suspension point in such a manner that the secondary detector (19) of a unit (1) is subjected to the same weight-loading P as the concerned primary load cell (17) and checks the signal therefrom. Suitable for their purpose, the combined units (1) comprise a vertical frame of U-form (15) which the primary load cell (17) is affixed to the upper leg (16) and the secondary load cell (19) to the lower leg (18) of the frame (15) of U-form whilst the outer side of the frame (15) of U-form is closed by a dismountable vertical connecting rod (20).</p> |
