Asphalt mixture three-stage crushing system and method

Abstract

The three-stage crushing system comprises a conveying mechanism, a feeding machine, a screening device, a first finished product bin, a second finished product bin, a third finished product bin and a fourth finished product bin. The screening device comprises a first-stage screen body, a second-stage screen body and a third-stage screen body which are of a double-layer screen structure, the first-stage screen body is used for separating the asphalt mixture into first-stage large-particle-size particles, first-stage medium-particle-size particles and first-stage small-particle-size particles, and the second-stage screen body is used for separating the first-stage small-particle-size particles into second-stage large-particle-size particles and second-stage small-particle-size particles; the third-stage screen body is used for separating the second-stage small-particle-size particles into third-stage large-particle-size particles and third-stage small-particle-size particles. The invention further discloses an asphalt mixture three-stage crushing method based on the asphalt mixture three-stage crushing system. According to the invention, the asphalt mixture can be subdivided into four grades, the particle size range of the single-grade finished product material is small, the mixing rate is low, the adulterability in the standard synthesis grading range is high, and the grading control is more stable.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a three-stage crushing system for asphalt mixture and a three-stage crushing method for asphalt mixture based on the three-stage crushing system for asphalt mixture. Background technique [0002] During the repair, maintenance, reconstruction, expansion and reconstruction of asphalt pavement, the original asphalt pavement will be milled, excavated, broken and other treatment measures. The old asphalt mixture obtained in this process is called RAP (recycle asphaltpavement) for short. RAP is composed of mineral aggregate and asphalt. The mineral aggregate is composed of a certain proportion of coarse aggregate, fine aggregate, and filler. The surface of the mineral aggregate is covered with asphalt, which has high utilization value. After the RAP is crushed and screened, the proportion of RAP particle sizes at all levels is fixed after classification, and at the same time,...

AI Technical Summary

Problems solved by technology

As mentioned above, the current level in China is that the number of bins is small and the mixing rate is high. It is difficult to increase the amount of RAP finished materials within the scope of the specification requirements, and the synthetic gradation is unstable. It is difficult to guarantee the performance of the recycled asphalt mixture produced. Therefore, the content of RAP in the domestic plant-mixed hot recycled asphalt mixture is generally about 30%, which is far less than the level of foreign developed countries.

In addition, after being divided into two levels, the screening pressure on the single-layer screen is too large, the contact time between the particles and the screen is long, and the problem of serious heating of the particles leads to the softening of the asphalt and the phenomenon of blocking the screen is not uncommon.

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