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Author: Smartweigh–Multihead Weighter
Multihead weigher is a weighing system that interrupts feeding and continues feeding. Because the weight loss control is carried out in the silo, it can achieve high linearity, and the structure is convenient for sealing. Spiral scales are a big improvement for comparison. It is suitable for the manipulation and seasoning of small raw materials such as concrete, quicklime powder and pulverized coal. At this stage, in our country, rotary mixers are all measured by volume method or electronic belt scales and spiral scales.
In our country, the measurement accuracy of the electronic belt scale used in the road field is generally only about 5%, which is no different from the capacity measurement verification, and the long-term reliability is weak. The bucket and the feeding mechanism are used as the whole scale body. According to the weighing display or the host computer software, the scale body is continuously sampled for the net weight data signal, and the change ratio of the net weight per unit time is calculated as the instantaneous total flow, and then according to various The technical solution of the filter of hardware and software is to obtain a filter that can be used as a manipulation target.“specific total flow”. The acquisition of this total flow is very critical and is the basis for the accurate measurement and verification of the multihead weigher. A classic approach is detailed in Figure 1.
According to the PID feedback optimization algorithm, the FC carries out the control calculation of the total flow close to the overall target, and outputs the adjustment data signal to control the control panel of the vibrating feeder such as the soft starter. The application of the differential signal multihead weigher in the specific application can be seen from the basic principle that it will not be affected by the mechanical equipment changes of the scale body and the feeding structure, and only measures the net weight error (differential weight), which is different from the traditional dynamic Compared with the measurement methods of sex measurement, the advantages are obvious. When the control target is the total flow (th, kgmin), and the raw materials are transportable and the precision of the metrological verification is high, the weightless state method of metrological verification can be used as a best plan.
The multihead weigher production process multihead weigher design scheme must pay attention to the factors that affect the accuracy. The multihead weigher has both static data scale and dynamic scale characteristics. Therefore, when designing the program system software, it is stipulated that: the appropriate transport rate range, generally specific The working range is 60%~70% of the rated transport capacity. If the communication speed is selected, it is best to respond to the stress frequency of 35~40Hz. This ensures a wide range of adjustments, as the system software is less reliable when transport rates are too low.
The measurement range of the sensor is moderate. In other words, the sensor also uses 60%~70% of its measurement range according to the formula. The data signal has a wide range of transformation, which is extremely beneficial to improve the precision. The mechanical system design plan should ensure that the raw materials have good circulation, and also ensure that the feeding time is short, and the feeding should not be excessively frequent. Generally, it is stipulated that the feeding should be done every 5 to 10 minutes. The transmission device of the supporting facilities should ensure stable operation and good linear shape.
The application prospect is accompanied by the rapid development of the electronic device control system. According to the new technology selected, the multihead weigher has improved the metrological verification accuracy from 0.3%~0.5% to 0.1%~0.2%, and even exceeded the static data scale. The key to the new technology is the use of digital display weight sensors.
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