Automatic sorting device and sorting method of elongated and flaky particles of coarse aggregate for road surface

Abstract

The invention discloses an automatic sorting device and sorting method of elongated and flaky particles of coarse aggregate for a road surface. The device consists of a feeding hole, a transverse rolling screen strip, a longitudinal fixed screen strip with screen thorns, an air blower, an air guiding pipe, a vibration motor, a force transferring rod, an impurity discharging hole, a discharge holeand a rack, wherein the longitudinal fixed screen strip and the transverse rolling screen strip are assembled to form a rectangular step type screen plate with a length-width ratio of 3 to 1 and formincluded angles of 5-6 degrees with a horizontal plane; the transverse rolling screen strip is used for reducing blockage of critical aggregate, the screen thorns on the longitudinal fixed screen strip are connected with four end points of a rectangular screen hole so as to form a groove which is conducive to embedding qualified aggregate; after passing through the air guiding pipe, the wind generated by the air blower provides uniformly distributed airflow acting force from bottom to top. The automatic sorting device can constantly jump and turn back under the action of vibration and the airflow acting force, the qualified aggregate is sifted under the structural action of the step type screen plate, and the unqualified aggregate climbs up along the step type screen plate until being sifted, so that the purpose of automatic sorting is achieved.

Description

technical field [0001] The invention relates to the field of aggregate processing for road engineering, in particular to an automatic sorting device and a sorting method for needle flake particles of coarse aggregate for road surface. Background technique [0002] Needle-shaped particles refer to particles whose size ratio between the minimum thickness (or diameter) direction and the maximum length (or width) direction of coarse aggregate particles measured by a vernier caliper is less than 1:3, and the content of needle-shaped particles is less than 1:3. % of aggregate mass. In engineering applications, because the needle-like particles are too slender or flat, the porosity of the concrete will increase and the strength of the concrete will decrease. At the same time, the needle-like aggregate increases the friction of the freshly mixed concrete during the flow process, making the workability and cohesion of the concrete worse, and tends to be arranged in one direction, wh...

AI Technical Summary

Problems solved by technology

The existing particle shaping equipment can reduce the content of needle flake particles in the aggregate to a certain extent by means of gyration and grinding, but the needle flake particles still exist

The current aggregate processing equipment has sorting equipment for light debris and soil content. The light debris can be sorted by the force of the airflow, and the soil content can be sorted by cleaning. Professional equipment for sorting particles

[0004] When the needle-like particle content exceeds 20%, the high-temperature stability of the asphalt mixture is significantly reduced. At present, there is no special device for effectively sorting the needle-like aggregate, which also affects the use of needle-like aggregate in high-level road construction. Efficient sorting raises urgent need

At the same time, as people's demands for high-quality pavement and intelligent pavement increase, construction technicians have higher and higher requirements for road construction raw materials. Traditional needle-like aggregates with a large content are difficult to meet modern construction Road demand, it is imminent to develop professional sorting equipment for needle flake particles in sortable aggregates

Images