A construction concrete preparation sand and gravel screening machine

Abstract

The invention relates to the technical field of building concrete, in particular to a screening machine for preparing sand and gravel from building concrete, which includes a base, an auxiliary separation device and a crushing and filtering device. In the separation device; the present invention improves the discharge rate of fine sand and gravel by first crushing the cohesive group of sand and gravel and then grinding and pulverizing the oversized sand and gravel, thereby solving the problem that the direct screening method cannot completely remove the sand and gravel. The problem of separation and low output of high-performance concrete; the invention adopts the method of winnowing and discharging, so that the materials that do not meet the size of the screening particles will not be stuck by the mesh due to extrusion, and the materials will be screened again by raising dust again Separate the material, so as to solve the problem of low efficiency of winnowing and screening.

Description

technical field [0001] The invention relates to the technical field of building concrete, in particular to a screening machine for preparing sand and gravel from building concrete. Background technique [0002] Architectural concrete is one of the most important building materials in the world today; although the use of this material has a long history, in recent decades, there have been great changes in both material properties and construction techniques. Big leap, first mix cement, sand and water together, then air-dry and set the concrete after pouring, it is a widely used material in construction engineering. [0003] In the process of producing concrete, the performance of concrete is slightly different due to the sand and gravel materials with different particle gradations. Therefore, it is necessary to screen the sand and gravel before making concrete. The following problems often exist in the process of screening the sand and gravel : 1. Due to the long-term placem...

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Problems solved by technology

[0003] In the process of producing concrete, the performance of concrete is slightly different due to the sand and gravel materials with different particle gradations. Therefore, it is necessary to screen the sand and gravel before making concrete. The following problems often exist in the process of screening the sand and gravel : 1. Due to the long-term placement of sand and gravel materials, some sand and gravel will be bonded into blocks, so that the direct screening method cannot completely separate the sand and gravel. Secondly, because the sand and gravel with different gradations make the concrete more dense, the obtained concrete The performance is better, but the proportion of fine materials in natural sand and gravel is not high, which indirectly leads to the low output of high-performance concrete; 2. When the sand and gravel are screened through the screen, the mesh will often be blocked by the sand and gravel, thus As a result, the screening efficiency of sand and gravel is gradually reduced.

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