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Automatic quantitative feeder control

In automatic quantitative feeding machine controlled chemical fiber production, it is often required to input solid powder raw materials into the process equipment in a constant basin. If the feeding is carried out intermittently (such as the dissolution of PVA in the production of vinylon, the dissolution of nylon basin in the production of nylon, etc.), the quantitative feeding is carried out automatically or manually using a weighing scale. If the feeding is continuous (such as the feeding of PVA to the dissolving machine in the water washing section of vinylon production), in order to feed the feeding machine evenly, the feeding amount per unit time should be kept constant, and automatic control of the feeding amount is necessary. Here, the full control system for feeding PVA to the dissolution machine is used as a specific example of automatic constant t feeder control.
1、 Fundamentals
The weight per unit length of PVA planted on the conveyor belt from the middle of PVA is Q (kg/m). Obviously, the weight t of this unit length is related to the material level in PVA. When the material level is high, there will be more material falling, and when the material layer is thicker, Q will be larger. On the contrary, Q will be smaller. The speed of the feeding device in the middle slot is synchronized with the metering conveyor belt. When the conveyor belt speed is two (2/min), the feeding device speed is also fast and there is more material falling. Therefore, it can be considered that the thickness of the feeding layer on the conveyor belt, i.e. the weight Q per unit length, is not affected by the speed of the conveyor belt.
2、 Measurement of feeding tw
In order to form a closed-loop regulation system, it is necessary to first measure the controlled variable W and use it as a feedback signal to send it to the regulator. The output signal of the regulator is then bent and dragged by the speed controller to change the speed of the conveyor belt motor, so as to keep the controlled variable (feeding egg) W constant.