Extruded asphalt pavement milling material crushing and screening device

Abstract

The invention discloses an extruded asphalt pavement milling material crushing and screening device which comprises a heating and conveying system and a crushing and screening system, wherein the heating and conveying system comprises a drum; a milling material is rotationally conveyed from a feed chute in the rear end of the drum to a discharge chute in the front end of the drum by virtue of the drum, and a heating device for heating the milling material is arranged on the drum; the crushing and screening system is arranged below the discharge chute and is obliquely arranged; the crushing and screening system comprises a crushing operation group consisting of multiple rotatable crushing units; and the milling material dropping onto the crushing operation group is extruded by the rotating crushing units and is collected by a screen. According to the device disclosed by the invention, a single and extensive RAP treatment mode in pavement hot regeneration in the conventional highway reconstruction and expansion can be effectively improved, further, the mix proportion design of hot recycled asphalt mixtures is further conveniently realized, and the pavement performance of the regenerated asphalt mixture is improved.

Description

technical field [0001] The invention relates to an asphalt pavement milling material pretreatment device, in particular to an extrusion type asphalt pavement milling material crushing and screening device for an asphalt mixing station. Background technique [0002] Asphalt pavement regeneration technology is to dig, recycle, crush and screen the old asphalt pavement that needs to be renovated or discarded, and then mix it with new aggregate and new asphalt materials to form recycled asphalt with certain road performance. Mixture, a complete set of technology for paving the surface layer or base layer of the pavement. Among them, the factory-mixed heat regeneration method is to transport the old asphalt pavement back to the mixing plant after milling, digging, and then crush it in a centralized way. The proportion of new asphalt materials, new aggregates and other materials is then stirred in a mixer to form a new mixture, which is used to pave the construction method of asp...

AI Technical Summary

Problems solved by technology

If a large number of recycled asphalt mixtures are produced, the manual crushing method is backward, not only takes a long time, but also the particle size of the old pavement material after crushing is uneven, and the crushing quality is difficult to guarantee. Generally, manual crushing is usually used to repair small-area pits and grooves; Large thermal recycled mixture mixing plants often use mechanical crushing. At the same time, there are certain requirements for the crusher. The old asphalt material cannot be crushed too finely, and the productivity of the crusher is also required to match the parameters of the productivity of the mixer.

In actual engineering, due to the lack of RAP pretreatment equipment and technology, the pretreatment of milling materials is at a simple and extensive technical level, which has an extremely adverse impact on the development of asphalt mixture regeneration technology for highway engineering in my country

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