What should be done if the output particle size of a sand making machine gradually increases

Sand making machines come in various types, and different models feature distinct internal structures, resulting in varying output particle sizes. During actual production, many users report that the particle size of manufactured sand gradually increases over time. So, what causes this increase in particle size?

The fineness of the sand-making machine's output particle size is directly related to the moisture content of the material being processed. Sand-making machines on the market require the moisture content of the sand-making material to be less than 20%, which is crucial. Additionally, low moisture content can increase the operating speed of the sand-making machine, improving production efficiency and capacity. The typical workflow of a sand making machine is as follows: Material is fed through a feeder, crushed by a jaw crusher, processed into sand by the sand making machine, screened by a vibrating screen, and finally washed by a sand washer. The finished product particle size yield from the sand-making machine also relates to the brittleness of the ore and the size of the feed particles. Easily crushed ores (highly brittle ores) yield a higher qualified product rate when fed into the sand-making machine at smaller particle sizes, and vice versa. Therefore, controlling the moisture content and brittleness of the ore during operation is crucial.

Why is strict adherence to the sand-making machine's feed specifications crucial? Material enters the machine through the feed hopper and is divided by the distributor into two streams. One stream enters the high-speed rotating impeller, where it rapidly accelerates to several times the gravitational acceleration. It is ejected at 60-80 meters per second through three evenly spaced channels in the impeller. First, it crushes the portion of material distributed around the distributor, then impacts the material lining within the vortex tube cavity. This lining rebounds and collides diagonally upward toward the top of the vortex chamber, altering its direction of motion downward. Material ejected from the impeller channels forms a continuous stream.

We can apply the above working principle of the sand-making machine for crushing. After raw materials enter the machine, the impeller distributes them into the flow channels. Since the impeller's ejection force is constant, oversized materials receive insufficient impact energy. When colliding with freely falling materials around the distributor, the impact force proves inadequate to crush them to the required size. Conversely, if the material is too small, the ejection force becomes excessive. It fails to collide with the freely falling material around the distributor, let alone break it down to the required size. Therefore, strict adherence to feed specifications is essential during sand-making machine production.

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