随着造型技术的发展,出现了许多高生产率的造型自动线,广泛地用于大批量的铸造生产中,相应对型砂的制备也提出了新的要求。型砂应当是单一砂,湿压强度高,具有一定的湿拉强度,而且每小时的需要砂量很大。因而世界各国在间歇混砂机的基础上逐步地发展了 With the development of molding technology, many high-productivity automatic molding lines have emerged, which are widely used in large-volume casting production. Correspondingly, new requirements for the preparation of molding sand are also put forward. Sand should be a single sand, high wet compressive strength, with a certain degree of wet tensile strength, sand required and hourly volume is large. Therefore, all countries in the world have gradually developed on the basis of intermittent sand mixer