Gravel grading system

Abstract

The invention discloses a gravel grading system comprising a powder selecting device, a centrifugal fan and a winnowing chamber. The powder selecting device comprises a static powder selecting deviceand a dynamic powder selecting device, an air inlet and an air outlet are formed in the static powder selecting device and the dynamic powder selecting device correspondingly, the centrifugal fan is connected with the air inlet through a first pipeline, and the winnowing chamber is connected with the air outlet through a second pipeline; an air return opening is further formed in the upper end ofthe winnowing chamber and connected with the centrifugal fan or the first pipeline through a third pipeline; and a feeding opening and a first discharging opening are formed in the upper end and the lower end of the static powder selecting device correspondingly, a second discharging opening is further formed in a conveying channel, and a third discharging opening is formed in the winnowing chamber. The air outlet of the device is connected with the air inlet of the fan, so that the closed cycle of a powder selecting system is realized, pollution to the environment can be reduced, meanwhile the power of the fan can be reduced, the effects of saving energy and reducing consumption are achieved, and the winnowing effect is improved; and a dynamic powder selecting machine can adjust the content of powder in a finished sand product to meet the requirement of controlling the component content of machine-made sand.

Description

technical field [0001] The invention relates to the technical field of sand and gravel aggregate production, in particular to a sand and gravel grading system. Background technique [0002] At present, large-scale domestic infrastructure construction consumes a large amount of natural resources, and high-quality river sand resources are becoming less and less. Excessive and disorderly excavation has caused serious damage to the river ecology. The road to use river sand is getting narrower and narrower. Therefore, sand making is rapidly becoming the main sand source for construction sand. Sand making is to sort sand by winnowing. The existing winnowing depowder machine can only achieve three separations, that is, into coarse sand, fine sand and powder. The powder separator cannot control the powder content, resulting in the The gradation of the artificial sand cannot be adjusted. To make the artificial sand have a good gradation, it is necessary to rely on the pulverizer to ...

AI Technical Summary

Problems solved by technology

Sand making is to sort sand by winnowing. The existing winnowing depowder machine can only achieve three separations, that is, into coarse sand, fine sand and powder. The powder separator cannot control the powder content, resulting in the The gradation of the artificial sand cannot be adjusted. To make the artificial sand have a good gradation, it is necessary to rely on the pulverizer to adjust the gradation of the artificial sand. This not only increases the investment in equipment, but also increases the production cost.

[0003] In addition, in the process of sand making, most powder selection systems use an open circuit for powder selection, which requires a large fan power. Therefore, the resource consumption caused by powder selection is high. On the one hand, it increases production costs. A certain amount of waste is carried out, and the open-circuit production mode exposes the screening of sand and gravel to the air, which will also cause environmental pollution

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