Dry-method aggregate pre-separation system and building type sand making process system

Abstract

The invention provides a dry-process aggregate pre-sorting system, which provides parabolic self-settling feeding, an area adjusting flap valve is arranged between a coarse sand sorting area and a medium and fine sand sorting area of an unpowered powder concentrator, the coarse sand sorting area is communicated with a coarse sand discharge port, the medium and fine sand sorting area is communicated with a medium and fine sand discharge port, and the medium and fine sand sorting area is communicated with a fine sand discharge port. And the stone powder dispersing area is communicated with a pressure variable frequency fan and a powder storage tank through a negative pressure suction pipeline. The invention further provides a building type sand making process system, the building type sand making process system is characterized in that a dry-method aggregate pre-sorting system, a screening system, a buffer stock bin, a wet mixing machine and a crushing system are sequentially arranged on a main building body from top to bottom, coarse sand pre-sorted by the dry-method aggregate pre-sorting system enters the screening system to be screened and classified, and medium sand and fine sand enter the wet mixing machine; coarse-fraction stones on a screen of the screening system are subjected to material returning closed circulation on the crushing system through a buffer stock bin, medium and fine sand under the screen enters a wet mixing machine to be graded, aggregate is pre-sorted, power equipment is reduced, the screening load is reduced, and the cyclic crushing load is reduced.

Description

technical field [0001] The invention relates to the field of machine-made sand process systems, in particular to a dry-process aggregate pre-sorting system and a building-type sand-making process system. Background technique [0002] With the popularization of the use of machine-made sand, many manufacturers have introduced dry sand making systems. The traditional process of dry sand making is: the crushed materials are directly sent to the screening equipment for screening, and the materials with a particle size greater than 2.5mm are returned to the crusher. Cycle broken. The disadvantages of this process are: the sieved raw materials contain a wide range of aggregate particle size and contain more stone powder, so the sieving machine should use a larger model, and the amount of returned materials is larger than the actual required ones. Hard-to-break materials pass through The repeated impact of the crusher increases the powder content of the machine-made sand, resulting...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a dry-process aggregate pre-sorting system, the purpose of which is to solve the problem of using a dynamic sieve for dynamic screening during the primary sorting stage where coarse, medium, fine sand and stone powder are seriously mixed on the traditional machine-made sand process line. The coarse sand cannot be effectively selected, the amount of crushing invalid return material is large, and the problem of over-crushing is serious

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