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Author: Smartweigh–Multihead Weigher
What is the measurement method of electronic multihead weigher? How is the multihead weigher measured? The multihead weigher takes the weighing hopper and the feeding mechanism as the whole scale body, continuously samples the weight signal of the scale body through the instrument or the upper computer, calculates the change ratio of the weight in unit time as the instantaneous flow rate, and then passes various software and hardware Filtering technology processing, it can be obtained 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. The figure introduces a classic method: multihead weigher measurement method, and then FC performs control calculations to approach the target flow rate through the PID feedback algorithm, and outputs adjustment signals to control feeder controllers such as frequency converters.
Matters that must be paid attention to in the design of multihead weigher, factors that affect the accuracy: multihead weigher has the characteristics of static scale and multihead weigher, therefore, when designing the system, requirements: 1. The correct conveying rate range, generally the actual working range is 60%~70% of the rated conveying capacity is the best. If AC speed regulation is used, the best strain frequency is 35-40Hz. This ensures a wide adjustment range.
Also due to poor system stability when the delivery rate is too low. 2. The range of the sensor is properly selected. According to the formula, that is to say, the sensor also uses 60%~70% of its range, and the signal range is wide, which is extremely beneficial to improve the accuracy. 3. The design of the mechanical structure should ensure that the material has good fluidity, and at the same time ensure that the feeding time is short, and the feeding should not be too frequent. Generally, it is required to refill once every 5-10 minutes.
The supporting transmission system must ensure smooth operation and good linearity.
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