Selective crushing sand making process after mixed aggregate pre-screening

Abstract

The invention discloses a selective crushing sand making process after mixed aggregate pre-screening. The process comprises a raw material discharging step, a raw material conveying step, a vibrationfeeding step, a screening step and a crushing step; a first crusher and a second crusher are arranged in the crushing step, and the first crusher and the second crusher are vertical shaft impact crushers; raw materials is output through the raw material discharging step and then sequentially passes through the raw material conveying step, the vibration feeding step, the screening step and the crushing step, and the crushed coarse materials and raw materials in the raw material discharging step are output through the raw material conveying step for circle operation; and the coarse materials screened out by an uppermost screen in the screening step fall into a waterfall feeding port in the first crusher in the crushing step. Compared with the prior art, the process has the beneficial effectsthat the raw materials are crushed after being screened, and then are screened and crushed after being crushed to form a closed-loop system, so that the crushing energy consumption is reduced, the crushing effect is good, the selection between low-rotating-speed crushing and high-rotating-speed crushing is realized according to the raw materials with different particle sizes, and the crushing efficiency is greatly improved.

Description

technical field [0001] The invention relates to a sand-making process, in particular to a selective crushing sand-making process after mixed aggregates are pre-screened. Background technique [0002] As we all know, the construction aggregates on the market such as stones and dry sand, among which the stones also have different particle sizes in different use occasions, such as the particle size of the stones used for asphalt concrete or high-performance concrete and for non- The particle sizes of the stones used for asphalt paving are all different in size distribution. The existing sand making process uses raw materials directly into the vertical shaft crusher to make sand directly by a single machine, and then screens after crushing, and then transports the fine materials to In the finished product warehouse, the coarse material is transported to the crusher for crushing, and then screened after crushing, so the cycle operation. However, when the raw materials belong to ...

AI Technical Summary

Problems solved by technology

However, when the raw materials belong to non-single-stage ingredients, due to the large particle size coverage of the raw materials, transitional crushing (high-speed crushing) or low-speed crushing (low-speed crushing) will occur directly when entering the crushing process, so the ideal crushing and sand making effect cannot be achieved. and produce ineffective energy consumption

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