The working principle of weightlessness scale
The weightlessness scale is a weighing and feeding device on the production line. The weightlessness scale is often used in the dynamic continuous weighing process, which can weigh and quantitatively control the materials that need continuous feeding, and also display the instantaneous flow and cumulative flow of materials. In principle, the weightlessness scale is a static weighing device, which uses the weighing technology of the static weightlessness scale and weighs the silo with a load cell. However, in the controller of the weightlessness scale, the weight loss of the weightlessness scale per unit time is calculated to obtain the instantaneous flow rate of the material. Schematic diagram of the working principle of the weightless scale. When the weighing chamber is empty, the filling valve can be opened. When the maximum level is reached, close the inflation valve and replace the weighing box with a weighing scale. stand by. In order to make the weighing accurate, the upper and lower parts of the weighing bin are connected by flexible inlets or outlets, so that the weight of the front and rear equipment and the materials therein will not be added to the weighing bin. The right side of is a schematic diagram of the continuous feeding process, and the continuous feeding process has multiple cycles (three cycles are shown in the figure). Each cycle includes 2 cycles: when the weighing chamber is empty, the inflation valve is opened, and the weight of the weighing chamber increases continuously. When the maximum level is reached at time t1, the inflation valve is closed. The screw conveyor begins to unload, and the weight reduction scale starts to work; after a period of time, when the weight of the weighing silo material continuously decreases and reaches the minimum level at time t2, the inflation valve reopens, and the time t1~t2 is gravity Feeding cycle; after a period of time, when the weight of the weighing silo continuously increases and reaches the highest level again at time t3, the inflation valve is closed, and the period from t2 to t3 is a reloading cycle, so it repeats. In the gravity feed cycle, the speed of the screw conveyor is controlled according to the instantaneous flow rate to achieve stable feeding; during the refill cycle, the screw conveyor speed is maintained at the same speed as before the start of the cycle, and is controlled in a constant volume flow control mode Feed. . Because the weightlessness scale combines dynamic weighing and static weighing, it combines intermittent feeding and continuous discharging, and the structure is easy to seal. It is suitable for weighing and batching control of fine materials such as cement, lime powder, coal powder, food and medicine. Can achieve high weighing accuracy and control accuracy. Guangdong kenweigh produces quantitative weightlessness scales and checkweighers. The company has a mature technical team and perfect after-sales service. To buy a quantitative feeder, choose Guangdong kenweigh, focus on quality and win the future together.
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