Device for drying sand of premixed concrete

Abstract

The invention relates to a device for drying sand of premixed concrete. The device comprises a first drying box and a second drying box. The sand sequentially passes through the first drying box and aspiral conveyor through a conveying belt and is fed into the second drying box. Multiple hot air inlets are formed in the top and the side wall of the first drying box. A stirring device is further arranged on the top of the first drying box and driven by a stirring motor. A first vibrating motor is arranged in the first drying box and located below the conveying belt and located behind the stirring device in the running direction of the conveying belt. The interior of the second drying box is a sealed cavity. The bottom of the second drying box is connected with a base through multiple air springs. A second vibrating motor is arranged at the bottom of the second drying box. An air inlet pipe is vertically arranged inside the second drying box, the bottom of the air inlet pipe and the bottom surface of the interior of the second drying box are connected in a sealing mode, and multiple exhaust holes are formed in the lower end of the air inlet pipe. The sand is thoroughly dried, and the moisture content is strictly controlled to be 1.0% or below.

Description

technical field [0001] The invention belongs to the technical field of construction and relates to a sand drying device for ready-mixed concrete. Background technique [0002] There are problems such as inaccurate measurement of raw materials, poor concrete quality, and high dust concentration in the manual on-site mixing construction of shotcrete in mine shafts. In response to this situation, the technology of ready-mixed dry material and ready-mixed concrete was proposed. Ready-mixed dry material refers to the bulk mixture in which concrete raw materials such as cement, sand and gravel are mixed evenly according to the design mix ratio and stored dry. Ready-mixed concrete is a kind of concrete formed after adding water and admixtures to ready-mixed dry materials and hardening. Ready-mix concrete has many advantages such as accurate mix ratio, good concrete quality, and low dust concentration. However, the very small amount of water contained in the sand in the ready-mix...

AI Technical Summary

Problems solved by technology

When the sand moisture content of the ready-mixed dry material is below 1.0%, the hydration products and microstructure of the ready-mixed dry material have little change, and the degree of material performance deterioration is low. The microstructure of the ready-mixed concrete is dense, and the strength of the ready-mixed concrete The loss rate does not exceed 8.64%, and the compressive strength reaches 42.3MPa, which meets the requirements; when the moisture content of the sand in the pre-mixed dry material is above 1.5%, the amount of cement that fails in the pre-mixed dry material increases and the material performance deteriorates.

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