Enhance the stability and accuracy of the weightlessness scale from many aspects
As a high-precision quantitative analysis seasoning equipment, the electronic belt scale weightlessness scale is widely used in the batching system with a small total flow. It is generally used in the batching system below 500kg/h. The appearance of the weightless scale has gradually replaced the electronic In contrast to the measurement verification methods such as belt scales and spiral scales, weightlessness scales have high linearity, sealed design schemes, simple and clear calibration, and good reliability. However, to make the weightlessness scale stronger for the production and manufacturing service projects, it is necessary to improve on the key points, that is, how the weightlessness scale can improve the credibility of the measurement verification and the accuracy of the operation. The key to improving the credibility of the measurement verification and the accuracy of the operation of the weightless scale is to start from the following multiple levels: 1. The electronic belt scale appropriately adopts the measuring range of the weighing sensor. In some conditions, the ash supply of the weightless scale is not large, such as 50kg/h. At this time, the sensor must have a higher sensitivity. If the measuring range of the sensor is too large, the change of the sensor to the net weight will not be compared. Sensitive, it is difficult to avoid the deviation of the measurement verification and even the display information of the total flow is zero. 2. Eliminate areas with vibration sources as much as possible. The harm of heavy vibration symmetry is obvious, and it is very irregular vibration source. Therefore, if there are standards, the weightlessness scale should be installed in areas that eliminate vibration sources. 3. For the situation where the ash feeding amount must be adjusted in the whole process of the feeder and the adjustment is relatively large, dual PID control should be adopted, one PID is used for coarse adjustment, so that the ash feeding amount can quickly reach the preset value, and then the other PID Carry out fine adjustment to make the amount of ash to be stable around the preset value.