The main problems in China coated sand detection is (1) detection means most companies are not perfect. Basic preliminary stage detection temperature strength, melting point, particle size and volume of hair; (2) domestic coated sand testing equipment accuracy and stability is not high, the same kind of equipment of different manufacturers use in field conditions coated sand, the coated sand detected relatively large differences in performance sometimes, for example, room temperature tensile strength can be a difference of 10 kg or more, a difference of 5 ml or more gas evolution. Currently more advanced testing equipment including high temperature coated sand performance tester, send gas meter, hot strength tester Which coated sand, centrifugal casting the thermal process is in rough shape of the metal type (iron type) within conventional centrifugal casting process, mainly for the production of Tube rotator casting, first in the iron mold cavity surface coated layer of paint in order to facilitate hanging modulo. In recent years, has developed a suitable alternative coating production centrifugal casting coated sand. Because of its exhaust is less effective, it requires a thin wall (about 3mm), and often using double sand, and casting the contact surface with sand (70/140 mesh), the outer layer of coarse sand (50/100 mesh) of in the 1950s began to study the application of coated sand and shell (core) processes, until the mid-1980s, only a few plants using homemade shell core for the production of coated sand. Since then, the coated sand began as a commodity on the market. With the continuous improvement of raw materials, manufacturing equipment and manufacturing processes, coated sand quality is improving, declining production costs, since the 1990s, the application of coated sand has been more rapid development of coated sand suppliers, increasing product range and have been formed. At present, China's annual production of coated sand casting has reached 50 million tons, a total of hundreds of professional manufacturers. With the rapid development of China's automobile industry and mechanical products export needs strong Which coated sand, and the development of the international market, casting, casting increasingly demanding high-quality, coated sand will be applied rapidly in the short term Growth coated sand coated sand production equipment _ _ provided by Qingdao Qingdao Heng Heng Machinery Co. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) strong, credible, Shandong Qingdao Cleaning equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Qingdao Heng and you hand into the brilliant, for a better future!