River sand screening device for concrete mixing on construction site

Abstract

The invention discloses a river sand screening device for concrete mixing on a construction site. A supporting frame is arranged at the bottom of a machine box. A feeding port is formed at the top ofthe machine box. A rectangular through groove is formed in the interior, below the feeding port, of the machine box. Vertical through grooves are formed on the two sides of the rectangular through groove. A fan-shaped box body is arranged in each vertical through groove. A second-level screening device is arranged in the interior, located below a rough filter screen, of the machine box. A fine sand outlet is formed at the bottom of the machine box. A drying conveying device is arranged at the top, located above the feeding port, of the machine box. According to the river sand screening devicefor concrete mixing on the construction site, river sands can be dried (wind-blowing and heating) before screening is conducted; thus the screen is prevented from being blocked by the river sands in the screening process; and screening can be conducted smoothly. By means of the river sand screening device, rough screening is conducted on the river sands first, and big pebbles and impurities in theriver sands are filtered out; then screening is conducted again on the river sands by means of an inclined fine filter screen, and river sands of small size are filtered out; and thus river sands ofmedium particle size and excellent property are acquired.

Description

technical field [0001] The invention relates to the technical field of river sand screening devices, in particular to a river sand screening device used for mixing concrete at construction sites. Background technique [0002] River sand is a non-metallic ore with complex components, smooth surface and high impurity content, which is produced by natural stones in the natural state, repeatedly collided and rubbed by the force of water for a long time. On the construction site, local materials are often used for economic benefits. Therefore, the sand used for mixing concrete is not the bagged standard sand transported from other places, but the river sand has undergone a series of treatments to meet the particle size requirements. It is directly used for concrete mixing, but it still has the following disadvantages in the actual use process: [0003] 1. There are many large particles of impurities in natural river sand. If these impurities are not removed, they will act as coa...

AI Technical Summary

Problems solved by technology

[0003] 1. There are many large particles of impurities in natural river sand. If these impurities are not removed, they will act as coarse aggregates, thereby affecting the proportion of concrete. After a long period of water erosion and weathering, river sand will There are a lot of fine powder and fine sand in it, and these fine powder and fine sand have a large specific surface area, which will increase the amount of cement used in concrete, thereby reducing economic benefits;

[0004] 2. Most of the natural river sand is relatively humid, and it is easy to block the screen during the screening process, making the screening impossible to continue

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