The basic elements of the general flask, the flask sales, should also have the following characteristics: 1) sand wall boxes with higher rigidity and strength to withstand the pressure higher than the pressure of the molding machine, and keep the sand box size and accuracy . 2) sand wall boxes with a certain precision slide, positioning holes, stopper, dowels, etc., sand box model, in order to complete the sand box shape, mechanized transport, positioning, flip-fitting, casting, off the sand, and other functions. 3) does not have a box with sand box, easy to automate modeling and shakeout. 4) the inside walls of sand boxes made more concave certain specifications to ensure the sandbox sand does not fall off during shipping, flips the process, does not shift. 5) The positioning accuracy of the flask should ensure the dimensional accuracy of the casting. 1) hand molding and semi-mechanized molding sand box structure: This sand box, mostly single-walled structure with handles for flipping and handling or transfer shaft, a considerable number of tank wall vents, Qingzhou sand box, use of whole-cast, steel or other material is also useful welded together. According to process requirements, sand box shape can be made rectangular, square, circular or other shapes. Pneumatic microseismic, injection pressure, high pressure, air impact, high specific pressure molding machine as the host of automated flow molding line with the flask to the work process: (2) with high host automated molding lines flask with specific pressure molding machine for the withstand high pressure, sand box sales, Dragon Industrial (certified), Qingzhou sand box provided by the Industrial Development Co., Ltd. Shandong dragon. Shandong dragon Development Co., Ltd. (www.julongshiye.com/) Shandong Weifang, machining leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Industry leaders at the dragon with the staff warmly welcome all inquiries negotiations to create a better future dragon Industry.