The measurement and distribution of weightlessness scale, what should be paid attention to when making a weightlessness scale
What is the measurement method of the electronic weightlessness scale? How is the weightlessness scale measured? The weightlessness scale uses the weighing hopper and the feeding mechanism as the entire scale body, and continuously samples the weight signal of the scale body through the instrument or the upper computer, and calculates the weight change ratio per unit time as the instantaneous flow rate, and then passes various software and hardware The filtering technology is processed to obtain the actual flow that can be used as the control object. The acquisition of this flow is very important and is the basis for the accuracy of the weightlessness scale. The figure introduced is a classic method: weightlessness scale measurement method. Then FC uses PID feedback algorithm to perform control calculations that approach the target flow, and output adjustment signals to control feeder controllers such as frequency converters. Matters needing attention in the design of weightlessness scale and factors affecting accuracy: weightlessness scale has both static and dynamic scale characteristics. Therefore, when designing the system, the following requirements are required: 1. The correct delivery rate range, generally the actual working range is 60%~70% of the rated delivery rate. If AC speed regulation is adopted, the corresponding frequency conversion rate of 35-40Hz is the best. This ensures a wide adjustment range. It is also due to poor system stability when the delivery rate is too low. 2. The sensor range is selected appropriately. According to the formula, that is, the sensor also uses 60%~70% of its range. The signal has a wide range of changes, which is extremely beneficial to improve accuracy. 3. The mechanical structure design should ensure that the material has good fluidity, while ensuring that the replenishment time is short, and the replenishment should not be too frequent. Generally, it is required to replenish the material every 5-10 minutes. The supporting transmission system must ensure stable operation and good linearity.