In the production of chemical fiber, it is often required to put solid powdered raw materials into the process equipment with a constant basin. If the feeding is intermittent (e.g. PVA dissolution in vinylon production, nylon pot dissolution in nylon production, etc.), then the quantitative feeding is automatically or manually carried out by means of a weighing scale, if the feeding is continuous (e.g. PVA is delivered to the dissolving machine in the washing section of vinylon production), in o