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Detailed explanation of the practical application of the multihead weigher principle

2022/09/29

Author: Smartweigh–Multihead Weighter

The multihead weigher is a weighing system that is continuously produced by the last rest. The operation process in weightless state is carried out in the raw material silo, which enables high linearity and makes the structure easy to seal. Therefore, in the operation process of granular raw materials, it has a very large improvement compared with the spiral scale.

It can be used as a manipulative condiment for fine raw materials such as concrete, quicklime powder, and pulverized coal. At this stage, the key to accurate measurement of rotating mixing machinery in China is volumetric method, electronic belt scale and spiral scale. The measurement accuracy of electronic belt scales used in the ground field in my country is generally only about 5%, which is different from the precise measurement, and the long-term authenticity is poor.

Differential signaling reduces the basic premise of drug (weightless) mean error. Taking the weighing silo and feeding organization as all scales, according to the electronic symmetrical weight data signal template and the host computer software, the conversion rate of net weight per unit time is accurately measured as the total flow of the instantaneous speed. According to the technical solutions of various hardware and software, it is very important to obtain the specific total flow that can be used as the target of the operation process, and it is the basis for the multihead weigher to be appropriate and accurate for metrological verification.

Figure 1 shows a typical approach. FC based on the PID feedback ant colony algorithm to carry out the operation measurement close to the overall target total flow, and output the adjustment data signal to control the feeder control panel such as the soft starter. Differential signal signal reduction average error combined with practical application.

It can be seen from the basic elements that the scale body and mechanical equipment of the supplying organization are not damaged, and only the reason (difference) of the net weight error is accurately measured. Compared with the traditional dynamic accurate measurement and verification method, the advantages are obvious. The target of the operation process is the total flow (th, kgmin). When the raw materials have excellent transportability and the precision of accurate measurement and inspection is high, the weightless state method can be selected to carry out accurate measurement and inspection.

The production process of the multihead weigher. Refer to Figure 2. The design of the multihead weigher must pay attention to the precision factor.

The net multihead weigher takes into account the characteristics of data type scales and dynamic scales, so when designing the system software, it is stipulated that the transport rate range is moderate, generally 60%~70% of the rated voltage transport is the best in actual work. When selecting communication and speed change, the frequency of resolution should be 35~40Hz. Which ensures that there is a very large adjustment range, because the realism of the system software is poor when the delivery rate is too low.

Whether the sensor test range is suitable is based on the calculation method. In other words, the sensor also selects 60%~70% of its inspection range, and the data signal conversion range is wide, which is very beneficial to improve the precision. The design of the mechanical system must ensure excellent flow of raw materials.

In addition, the canning time is short, and the canned raw materials are not suitable for too much. Generally, it takes 5 to 10 minutes to spread the raw materials once. The transmission device of auxiliary machinery and equipment should operate stably and have good linear shape.

application prospects. With the rapid development trend of fully automatic automatic control system of electronic equipment, the precise measurement and inspection precision of multihead weigher has increased from 0.3%~0.5% to 0.1%~0.2%, even beyond the data type scale. The key to this new technology is the use of data-information weight sensors.

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