Asphalt mixture screening device

Abstract

The asphalt mixture screening device comprises at least three screen bodies and at least three excitation motor sets used for driving the screen bodies, the screen bodies correspond to the excitation motor sets in a one-to-one mode, and each screen body is of a double-layer screen structure; the screen surfaces of the screen bodies are perpendicular to the excitation force directions of the corresponding excitation motor sets, so that the excitation force directions of the excitation motor sets and the gravity centers of the corresponding screen bodies are located on the same straight line, and the screen surfaces of the screen bodies do linear motion in the corresponding excitation force directions. According to the invention, the asphalt mixture can be subdivided into multiple grades, and small particle size range, low mixing rate, high adulterability in a standard synthesis grading range and more stable grading control of a single-grade finished product material are ensured.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to an asphalt mixture screening device. 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, the proportion of particle size particles at all levels of the new material is also fixed. Therefore, a certain proportion of gr...

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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