UA81726C2 - Method of backfilling of form blocks by sand in the container - Google Patents

Abstract

Invention relates to the branch of metallurgy, namely to the method of backfilling of form blocks by sand in the container. The method of backfilling of form blocks by sand in the container, according to which in the container is established a form block, which is covered with mobile screen and said block is filled by sand from the bunker through the distributor with openings. The screen made in the form of framework is located inside the container, it covers the form block, and the screen is displaced upward in proportion to the backfilling of sand, and the sand is filled along perimeter of the screen between its walls and walls of container. Also inside the framework of screen, at the height, which exceeds the height of model block, may be filled up facing molding sand, and the upward motion of the framework of screen can be carried out at the end of filling of container by sand. Furthermore, inside the framework of container can be placed the facing molding sand, and outside the screen can be filled noncooled reused sand. The screen may be made from thermal insulation material protected by sheet metal jacket, and equipped with attached bottom. The displacement of the framework of screen is carried out at a speed, which does not exceed the speed of swirling the small particles of sand in air. Invention provides for improvement in the quality of castings and it prevents raising dust into air during filling of sand into container.