Device and method for preparing recycled coarse aggregate

Abstract

The invention relates to a device and a method for preparing recycled coarse aggregate. The device comprises a motor unit, a feed hopper and a smashing device, wherein the smashing device is a jaw-type smashing device, and is used for extruding and smashing by jaw plates; the jaw plates comprise a movable jaw plate and a fixed jaw plate; an adjusting support I is used for adjusting the movable jaw plate and controlling the distance between the jaw plates; a grinding device is arranged below the smashing device; a discharging hole of the smashing device is taken as a feeding hole of the grinding device; the grinding device comprises a protection plate, an adjusting support II and two rows of rollers; the distance between the two rows of rollers is adjusted through the adjusting support II; a discharging hole is formed below the grinding device. By adopting the device and the method, a smashing function and a grinding function are combined, intermediate processes are reduced, the efficiency is increased, and the cost is lowered; the prepared concrete recycled coarse aggregate has the advantages of high grain size class and less adhesion of used mortar; moreover, projecting edges and corners on the recycled coarse aggregate can be removed by milling, and meanwhile smashing and reshaping of the recycled coarse aggregate are realized.

Description

technical field [0001] The invention relates to a device and method for preparing recycled coarse aggregate. Background technique [0002] Concrete is currently the most widely used building material, with a huge annual consumption. At the same time, the amount of waste concrete generated during the preparation, construction and demolition of buildings is also huge, which is difficult to handle and easily causes environmental pollution. How to rationally utilize recycled coarse and fine aggregates made of waste concrete to replace natural coarse and fine aggregates to prepare recycled concrete with properties that meet engineering application requirements is one of the important directions of current concrete material research. However, the crushed recycled concrete aggregates, especially the recycled coarse aggregates, have old mortar and cement stones attached to the surface, which leads to the failure of the performance indicators of the final prepared recycled concrete t...

AI Technical Summary

Problems solved by technology

The chemical strengthening method mainly uses materials of different properties (such as polymers, silicone waterproofing agents, pure cement slurry, fly ash, etc.) to soak and rinse recycled aggregates, then dry and sieve them to achieve the purpose of strengthening aggregates. , but the chemical strengthening method has no obvious effect on improving the performance of recycled concrete, and the treatment cost is high, so it is difficult to popularize and apply; the physical strengthening method uses mechanical equipment to make recycled aggregates collide and rub against each other, and to a certain extent remove the attached mortar on the surface of recycled aggregates , edges and corners, ultimately improving the quality of recycled aggregate and the performance of recycled concrete

However, in order to obtain high-quality recycled coarse aggregate, in addition to the jaw crusher, it is also required to purchase an additional grinder for further grinding. There are more processes for transferring recycled aggregate, re-feeding and screening, and the cost increases, which is not conducive to popularization. application

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