| 摘要 |
The system controls the weights of individual charges of product or material accumulated by feeding material, preferably at a high "bulk" flow rate and then at a relatively low "dribble" flow rate, into one or more buckets or hoppers. As material is accumulated within each bucket, the system compensates against the effects of vibrational forces and flow rate and, upon termination of material accumulation, it corrects dribble time and final weight by respectively adjusting the bulk and dribble weights for the next charge, all with respect to an electronically established set weight corresponding to the desired weight of each charge. A linear voltage differential transformer (LVDT) senses the position of each bucket and provides electrical signals which are utilized by interface and control circuitry to control charge weight and provide an internal reference. The control system is particularly suited for use in combination with packaging systems.
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