How to choose raw materials for ventilation duct production and manufacturing machinery and equipment

Ventilation duct is an important part of the ventilation system, and it is also the main part of the construction drawing calculation of ventilation equipment. It is still one of the fundamentals of commercial buildings today. The materials used before the ventilation duct manufacturing equipment must conform to the current national standard rules. Nowadays, ventilation ducts are divided into thin steel ducts, fabric duct board ducts, aluminum ducts, composite steel ducts and plastic ducts according to the materials used. Among so many ventilation materials, how to choose a reasonable and suitable material? First of all, we must know the requirements for the selection of ventilation ducts: 1. All kinds of plates and pipes should have quality certification documents (including factory certificate, quality certificate and test report, etc.) and product list. 2. The wind control products are not allowed to have defects such as deformation, distortion, cracking, holes, flange drop, open welding, missing riveting, and missing bolt holes. 3. The valve body muffler, cover body, tuyere and other components of the equipment should check whether the dispatching equipment is active, and whether the muffler sheet and paint layer are damaged. 4. Materials used in the equipment: bolts, nuts, washers, gaskets, sealing strips, self-tapping screws, rivets, welding rods, various canvases, non-woven fabrics, shooting nails, expansion bolts, etc. should meet the requirements of product quality . Secondly, different materials should be selected for ventilation ducts for different purposes: 1. Air ducts for special applications: mining tape-coated air ducts, mining plastic ventilation ducts; 2. Air ducts for industrial ventilation systems: steel plate, galvanized Zinc plate; (plastic, glass fiber reinforced plastic, composite material can be used) 3. Air duct for environmental control system: galvanized sheet, fabric air duct; (plastic, glass fiber reinforced plastic, composite material can be used) 4. Air duct for central air-conditioning system: galvanized Zinc plate, color steel insulation board; (glass fiber reinforced plastic and composite materials can be used) (Note: fiberglass reinforced plastic air ducts can be divided into organic and inorganic types, and organic materials are prohibited for fire protection requirements according to the program standards;) 5. Air ducts for purification of air conditioning systems : Galvanized sheet, fabric air duct; (FRP and composite materials that can cause dust pollution in use are prohibited) Finally, the comparison of several common materials: (1) Thin steel plate air duct. It can be divided into galvanized steel plate and usually thin steel plate air duct. It is the most commonly used material. The connection between air ducts usually adopts angle steel or flat steel flange. (2) Fabric duct board duct. For transporting corrosive gases, its pipes and components must be made of fabric air duct plates. The connection of this air duct valve is flanged, and its connection can also be made of fabric air ducts. Rectangular flanges can be directly welded; round The flange should be processed by cold bending. (3) Aluminum duct. Made of aluminum and aluminum alloy plates. Because aluminum has better resistance to chemical corrosion, it is often used to transport corrosive gases. (4) Plastic sheet air duct. It is made of hard polyvinyl chloride plastic plate, which has good chemical stability and is often used to transport corrosive gases. According to the connection method, it can be divided into two types: bite and welding. Ducts are usually manufactured at a processing plant or construction site. Usually, when the amount of work is not large or the construction site allows, the individual tubes can be processed on site, using manual operation and the use of some small processing machinery.

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