In the coated sand production areas should be strengthened following two aspects: (1) hair coated sand pollution, mainly from the following aspects: ① to reduce the amount of resin and curing temperature; ② coated sand to improve the overall performance of coated sand regeneration companies, especially high temperature performance; study pollution phenolic resin substitutes ③ strengthened;. (2) increase the regenerative capacity of coated sand coated sand coated sand production equipment package recycling has been a subject of concern to the majority of experts in renewable coated sand production line offer, now coated sand regeneration equipment is expensive and inefficient regeneration film sand reclamation, production efficiency of 5 tons / hour of thermal regeneration equipment prices in the 1200-1600 yuan, coated sand regeneration cost 65-90 yuan / ton, so the cost can not be covered for domestic foundry enterprises In addition to the quality of the sand core 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, pale yellow center regeneration coated sand production line factory, when presented burnt brown and even black appearance, lack of hardened look yellow, white iron center with Sand Casting The main technical parameters: type iron wall thickness 25mm, coated sand thickness 5-8mm (for small bore ductile iron crankshaft); iron-type quality in general is about five times the quality of castings; iron ore ratio (casting quality and the consumption of cover The ratio of the amount of sand membrane) 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, particularly suitable for mass production; the latter suitable for single-mass (iron type size up to several meters in length) of the crankshaft, etc., 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 thickness of 4-5mm, its density maximum regeneration coated sand production line _ Qingdao Heng (certified) _ Shanghai 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.