The working principle of weightlessness scale1
Above we have introduced the structure of the weightlessness scale and the functions of each component. Today we will share the working principle of the weightlessness scale. To understand the working principle of the weightless scale, we must first understand the structure of the weightless scale (you can click to read) and the working process of the weightless scale. The process of weightlessness scale Let's first look at the process of weightlessness scale: the weight of the material in the weighing hopper is converted into an electric signal by the weighing sensor and sent to the weighing instrument. The weighing instrument will calculate the weight of the material with the preset weight. The lower limit value is compared and judged, and the feed gate is controlled by PLC, and the material is fed into the weighing hopper intermittently. At the same time, the weighing instrument compares the calculated actual feeding rate (discharge flow rate) with the preset feeding rate, and uses PID adjustment to control the discharging device so that the actual feeding rate accurately tracks the set value. . When the feed gate is opened to feed the weighing hopper, the control signal locks the feed rate and performs volumetric discharge. The weighing instrument displays the actual feed rate and the cumulative weight of the discharged material. Working principle of weightlessness scale Understanding the structure of weightlessness scale and the working process of weightlessness scale, we can understand that weightlessness scale realizes measurement through the principle of controlling weight loss during work. Firstly, the discharging device and weighing hopper are weighed. According to the weight loss per unit time, the actual feeding rate is compared with the set feeding rate, so as to control the discharging device so that the actual feeding rate always accurately conforms to the setting. Fixed value, in the short-time feeding process, the discharging device uses gravity to make the control signal stored during the working period work according to the volumetric principle. In many weighing equipment, the temperature of the load cell changes due to the adhesion of the materials, which causes the tare weight to change, which causes the accuracy of the system to decrease. But the weightlessness scale overcomes this drawback, it will not reduce the weighing accuracy due to temperature changes. The feed rate measurement of the weightlessness scale is based on the weight difference rather than the weight, so the weightlessness scale has a very broad application prospect in the bulk material conveying system.