First, the product description total of flange plate system is internationally ventilation pipe flange connections make one of the two systems, it has a low cost, good sealing performance, simple and easy installation features, particularly suitable for small cross-sectional area of ??the ventilation pipe production . Flange forming large-scale industrial systems can be used in factory production, is a high efficiency of the new design duct flange system. Flange forming machine and reel bone machine, Cutaway, beading machines and plasma cutting machine synthesis of fully automated production lines, also grouping the equipment shipped to the construction site is very suitable for the current needs of the domestic construction companies. Second, product characteristics 1. Mechanical molding enables high-quality galvanized sheet from harm, ensure the pipe wall is smooth, easy to clean. 2. Since forming flange angle flange replaced to ensure unified pipe material, pipe weight reduction, increased pipeline beauty. Stiffener can improve the strength of the wall, saving material thickness. 3. Scientific seams, seams methods, to ensure smooth gas pipeline, without affecting the circulation pipe diameter. 4. Advanced process control computer program cutting, making, precise dimensions of the components of the pipeline to ensure simple installation and construction, and improve economic efficiency. 5. ensure the installation is simple, improve work efficiency, shorten working hours, reducing installation costs. Third, the technical requirements 1. Material: high-quality galvanized sheet steel thickness 2, stainless steel plate: 0.5mm-1.2mm minimum diameter: 120 * 120mm 3. The maximum diameter: 3000 * 1200mm net length of each section: 1165mm