Multistage screening mechanism

Abstract

The invention relates to the technical field of material crushing, in particular to a multistage screening mechanism. The multistage screening mechanism comprises a first-stage primary crushing unit and a fine crushing unit arranged on the downstream part of the primary crushing unit, wherein the primary crushing unit and the fine crushing unit each comprise a screening structure which is used for screening out materials with a preset grain diameter so as to avoid over crushing of the materials in the units. According to the multistage screening mechanism, the materials with the preset grain diameter can be screened out of the current crushing units timely in the crushing process and can be prevented from being crushed continuously, and therefore over crushing is avoided, and the machining workload is reduced.

Description

technical field [0001] The invention relates to the technical field of material crushing, in particular to a multi-stage screening mechanism. Background technique [0002] Most of the existing material crushing processes are relatively rough, mainly through crushing and screening steps to crush the materials and then concentrate them for loading. Because the crushing process is too rough, many building materials are unqualified in size, and the built buildings are weak in compression resistance. In order to solve the above technical problems, the Chinese patent document CN104923374A discloses a multi-stage fine crushing production process of fine sand for construction, including: the massive sandstone passes through the coarse crushing part, the medium crushing part and the fine crushing part of the primary screening workshop in sequence ;The fine sand output from the fine crushing place is screened, and the sand with a diameter of less than 40mm is transported to the secon...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the material in the prior art cannot be discharged in time after being crushed to a predetermined particle size, resulting in over-crushing and increasing unnecessary processing, thereby providing a crushing to a predetermined particle size. The material with the largest diameter can be screened out in time and the current crushing unit will not continue to be crushed, so as to avoid the phenomenon of over-crushing and reduce the processing capacity of the multi-stage screening mechanism.

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