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Author: Smartweigh–Multihead Weigher
The multihead weigher is a weighing device for intermittent feeding and continuous discharging. Because the loss control is carried out in the hopper, it can achieve high control accuracy, and the structure is easy to seal. Therefore, it is better to use a screw scale for powder control. It is a big improvement compared to. It is suitable for controlling the batching of fine materials such as cement, lime powder, and coal powder. Taking the weighing hopper and the feeding mechanism as the whole scale body, the weight signal of the scale body is continuously sampled through the multihead weigher meter or the upper computer, and the change ratio of the weight in unit time is calculated as the instantaneous flow rate, and then through various hardware and software Filtering technology processing, can be used as the control object“actual traffic”.
The acquisition of this flow is very important, and it is the basis for the accurate measurement of the multihead weigher. FC uses PID feedback algorithm to perform control calculations approaching the target flow rate, and output adjustment signals to control frequency converters and other feeder controllers. It can be seen from the principle that it is not affected by the mechanical changes of the scale body and the feeding mechanism, but only calculates the weight difference (differential weight). Compared with the traditional dynamic measurement method, the advantages are self-evident.
When the control object is flow, and the material has good transportability and high measurement accuracy, the weight loss method can be used as an ideal solution. When the multihead weigher design is necessary, we must pay attention to it, so as not to affect the accuracy. First, we must determine the correct delivery rate range. Generally, the actual working range is 60%~70% of the rated delivery volume. If AC speed regulation is adopted, the corresponding strain frequency is 35~40Hz.
This ensures a wide adjustment range, since the system stability is poor when the delivery rate is too low. The range of the sensor is properly selected, and the sensor also uses 60%~70% of its range. The signal range is wide, which is beneficial to improve the accuracy; the mechanical structure design should ensure that the material has good fluidity, and at the same time ensure that the feeding time is short. If it is too frequent, it is generally required to refill once every 5 to 10 minutes. The supporting transmission system must ensure smooth operation and good linearity.
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