Precoated sand self-cleaning three-dimensional mixing method and sand mixing machine for precoated sand

Abstract

The invention discloses a precoated sand self-cleaning three-dimensional mixing method and a sand mixing machine for precoated sand. The sand mixing machine comprises a machine basin, a parabola-shaped three-dimensional scrapper blade, a bowl-shaped sleeve, a center rotary vertical column, a synchronous rotor frame, a layered material pressing plate and a material returning pressing plate, wherein the bowl-shaped sleeve is arranged in the machine basin and is sequentially provided with the parabola-shaped three-dimensional scrapper blade and the center rotary vertical column from top to bottom; the synchronous rotor frame is arranged on the center rotary vertical column; the layered material pressing plate is arranged on the inner wall of the machine basin; and the material returning pressing plate is arranged on the layered material pressing plate in the machine basin. The sand mixing method comprises the following steps of: throwing upwards regenerated precoated sand and new precoated sand in the machine basin of the sand mixing machine by centrifugal force of materials under the action of the parabola-shaped three-dimensional scrapper blade, pressing the materials by the layered material pressing plate to generate convection exchange, stirring the materials under the common action of a rotor blade and a rotor stick, and accelerating the upward throwing movement to enable the materials continuously upwards move along the circle and return to the machine basin for the next mixing and rolling cycle. The precoated sand self-cleaning three-dimensional mixing method and the sand mixing machine for the precoated sand have the outstanding advantages of high sand mixing quality, high efficiency and low energy consumption.

Description

technical field [0001] The invention belongs to the field of foundry machinery, and in particular relates to a self-cleaning three-dimensional sand mixing method for coated sand and a sand mixing machine thereof. Background technique [0002] In the coated sand casting process, regenerated hot sand or hot sand and cold sand need to be mixed and coated. [0003] The existing sand mixing method is to use a sand mixer to mix hot and cold sand. [0004] The mixing part of the existing sand mixer is generally composed of a machine basin, a mixing and stirring device, a scraper and the like. The mixing is only carried out around the mixing and stirring device, the mixing efficiency is low and the quality is poor. The mixing and stirring device is divided into roller type and rotor type, which are responsible for stirring the material, and the scraper is responsible for tumbling, cleaning the chassis and the surrounding sticky material. The scraper device rotates at a low speed ...

AI Technical Summary

Problems solved by technology

The scraper device rotates at a low speed to scrape and turn over the remaining materials outside the mixing device. Because the flow speed of the materials is relatively low, especially the effect of the bottom scraper on the upward churning is too small, it is difficult to quickly remove the materials in the upper and lower layers and the inner and outer layers. Convective exchange is also one of the reasons for the low mixing efficiency

[0005] In the existing sand mixer, the materials bonded to the enclosure and the chassis are turned up under the action of the scraper, and the gap between the scraper and the enclosure causes a part of the material to stick to the enclosure and the chassis, resulting in the failure of the scraper. Fast wear and tear, and a lot of waste of power consumption

[0006] The existing sand mixer is especially applied to the mixing and rolling of materials by the thermal coating method, because the contact area between the surface layer of the material and the machine body is relatively small, the total cooling surface of the water layer is not large, and the material cannot be cooled rapidly. As a result, the mixed rolling time is prolonged, the coated resin mold is damaged and falls off, and the finished sand has low strength and poor quality

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