Quality coated sand core in addition to the geometry, dimensional accuracy, surface quality and shell thickness of the sand core, the sand core but also by observing the color of cured core sand test case. The normal situation is that the appearance of the sand core should be uniformly brown, center yellow, when burnt brown and even black exterior rendering, lack of hardened exterior yellow coated sand regeneration, the center is white with Sand cast iron main Process parameters: iron-type wall thickness 25mm, covered sand thickness 5-8mm (for small bore ductile iron crankshaft); iron-type quality in general is about five times the mass of castings; iron ore ratio (casting quality and the consumption of coated sand volume ratio) of 6-7. Iron-type cladding sand molding methods (ie sand overlying obtained) has shot molding and compression molding sand two, the former is currently used more, for ordinary coated sand coated sand coated sand regeneration, particularly suited for high-volume production; the latter applies to single-mass (iron type size up to several meters in length) of the crankshaft, covering a variety of fluidized sand Sand. The former sand shot selection pressures related to the thickness of the coated sand, sand shot when the pressure is 0.2-0.6MPa coated sand regeneration equipment, film thickness of 4-5mm sand, its densest type iron-coated sand process of the process in metal type (iron type) cladding a thin layer of coated sand lumen crude shaped (3-8mm) to form a mold, shown in Figure 1. It does this by various means, such as technology test, computer simulation, experience charts, reasonable set of iron-type wall thickness and the thickness of coated sand, sand casting system and coating materials to achieve so cast in a more favorable conditions Under the complete filling and solidification cooling, improve its internal quality and surface quality purposes coated sand recycling equipment, Qingdao Heng (certified), coated sand regeneration provided by Heng Machinery Co., Ltd. Qingdao. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) is Qingdao, cleaning, cleaning equipment leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Qingdao Heng led the staff warmly welcome all inquiries negotiations to create a better future Qingdao Heng.