Screening device for a plurality of single grade size of rock material and screening method thereof

Abstract

The invention relates to a screening device which comprises an upper screening machine, a lower screening machine, a frame and auxiliary accessories. The screen machines are both provided with closed screening bins, screens with different screen meshes are installed in the bins, can be horizontally installed, also can be obliquely installed, wherein the inclination is changed within 0 degree-45 degrees. Mixed rock materials with different grain sizes are vibrated by a vibration shaft after entering the screening bins, and rock material with large grain size is left on the first-stage screen, and then is transmitted to a specific stocking point by a first-stage discharging pipeline and a discharging belt conveyer. Rock materials are screened in five stages according to the grain size, the qualified rock material of single grade size is ready to apply, and waste material is ready to abandon. The screening device has simple structure, the screening method is feasible and practical, the operations are easy, safe and convenient, not only the production efficiency is high, but also the quality of rock material in each single grade size can be guaranteed to reach standards, and the qualities and the use performances of an asphalt concrete surface layer and a cement crushed stone base layer can be guaranteed. Therefore, the screening device has wide development prospect.

Description

technical field [0001] The present invention relates to a device and a method for screening solid materials, in particular to a method for screening mixed stones of different particle sizes into single-grained stones of various gradations required by high-grade highways. Screening device and screening method. Background technique [0002] The asphalt pavements of high-grade highways and urban arterial roads are all asphalt concrete surface courses, and most of the semi-rigid bases below are cement-bonded gravel. The latest research results prove that in order to make the performance of asphalt concrete and the strength of the cement-bound macadam layer meet the design requirements, and there will be no obvious variability in the construction process, it is necessary to ensure that the cold material gradation used in asphalt concrete is fully in line with the design requirements. The mineral material gradation; the crushed stone coarse and fine aggregates used for cement-bou...

AI Technical Summary

Problems solved by technology

[0003] The present invention has made a groundbreaking research and development for the above-mentioned problems, transforms the existing screening equipment into a screening device capable of producing a variety of single-grained stones that meet the requirements, and proposes a screening method at the same time. If there is a screening equipment to screen the coarse aggregate into stones with a single particle size, it must be screened multiple times, the workload is heavy, and there are defects that the quality of the particle size is difficult to guarantee

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