Before construction, the technicians must be familiar with the drawings and relevant data carefully, and understand the technological process, working medium, pressure, temperature and other technical parameters as well as the materials, models and specifications of the materials and accessories used. The construction personnel must be fully familiar with the construction procedures, construction methods, quality standards, operating procedures and safety technical requirements, and strictly implement them during construction. Main materials used for making galvanized air duct, Wuhan Cord hose It shall comply with the current national product standards and the enterprise standards of the manufacturer, and shall have the factory certificate and other relevant material certificates. All material accessories must be rechecked with the design and current national product standards, and shall have the factory certificate, material quality assurance and other relevant material certificates. Combined flange air duct is also called thin-walled steel plate flange air duct. It is an air duct connected by non profile steel and made of galvanized steel plate. Its connection form can be directly pressed by strips or steel plates or the air duct and flange can be integrally formed. This kind of air duct has advanced manufacturing technology, accurate blanking, low material consumption, stable product quality, many varieties, smooth contour lines, and air leakage rate far lower than the national standard, which is conducive to the production of ventilation ducts to be industrialized, large-scale, standardized and automated. It is a scientific and technological achievement project that has been vigorously promoted in China in recent years as one of the non blue air duct processes. The National Grand Theater project is to use this new process air duct. Common plate flange air duct 1 Fabrication of composite flange air duct Common mechanical equipment for fabrication of composite flange air duct include: rectangular air duct full-automatic production line, plasma automatic cutting machine, flange strip forming machine, hook code forming machine, conjoined flange forming machine, etc. The combined flange air duct is based on the air duct size given in the drawing, Cord hose Where can I find it? Fully automatic production line is used to produce coiled material with a common width of 1250mm, and the plate thickness is 0.5~1.2mm. When the large side of the air duct is less than or equal to 2m, the air duct is formed into TDC1 flange, and the standard pipe length is 1170mm; When the large side of the fabricated air duct is less than or equal to 2.5m, the air duct is formed into TDC2 flange, and the standard pipe length is 1250mm; When the large side of the fabricated air duct is more than 2.5m, the air duct is formed into an angle steel flange, and the standard pipe length is 1230mm

production Cord hose The manufacturing of is highly automated and the production speed is very fast. The general air duct can produce 20~40 meters per minute. Due to the low price of its raw material galvanized strip steel compared with the whole galvanized steel sheet, and its factory production and specification standardization, the cost of spiral air duct is lower than that of rectangular air duct; In addition, the total cost of spiral air duct is low due to the less demand for supports and hangers and the less installation work. Since the four corners of rectangular air ducts are prone to turbulence, reducing the effective flow area, the spiral air ducts have good air fluidity and large effective flow area, so the secondary noise of spiral air ducts is low. Because the spiral air ducts are strong, the low-frequency noise caused by air duct vibration is smaller, the air flow performance is good, the system pressure drop is small, and the daily operation system consumes less power. Spiral air ducts in the market are generally divided into three categories according to their materials: galvanized spiral air ducts, stainless steel spiral air ducts and composite spiral air ducts. Among them, spiral air duct has the best quality and strong applicability, but its price is high. At present, the most widely circulated spiral air duct on the market is galvanized sheet. The galvanized sheet spiral air duct is basically the characteristic of stainless steel spiral air duct, but its price is only two thirds or even lower than that of spiral air duct. Wuhan Cord hose It is generally used in places where the external environment is relatively common and the requirements for air ducts are not too high. As the iron sheet is prone to chemical reaction in various environments, corrosion and rust will occur. However, zinc hardly changes in dry air. In humid air, dense basic zinc carbonate film will be formed on the surface of zinc. The spiral air duct is mainly coated with zinc on the iron sheet of the air duct to protect the iron sheet. The protective and decorative properties of zinc coating can be significantly improved after passivation treatment, dyeing or coating with light protecting agent.

Wuhan Cord hose Compared with rectangular duct, it is widely used in the ventilation industry. Why? Let's start with its advantages to solve this problem and make it clear. At the same time, through the following introduction, I hope you can know more about the spiral duct and make yourself more professional in this regard. Now let's understand the function of air duct: function 1: air supply and ventilation. It is used to transport fresh air and waste gas, exhaust harmful gas, and deliver outdoor fresh air to the room. Generally speaking, spiral air duct is good. If the environment is humid or corrosive, stainless steel shall be used to avoid rust and corrosion of air duct. Function 2: provide cold air. It is mainly used for central air conditioning, but thermal insulation materials need to be added on the air duct. Function 3: Exhaust lampblack: It is mainly used to exhaust kitchen lampblack in restaurants, hotels and other places. Generally, circular air ducts are used. Function 4: dedusting and bulk material conveying: in the factory workshop, the air duct is used for dedusting, and the spiral air duct can be used for conveying particles, such as foam plastic particles, because Cord hose Where can I find it? The proportion of products is small. 1) Under the same plate thickness and pipe diameter, the strength of spiral air duct is higher. (2) Under the same section, the structural tension of spiral air duct is more reasonable, the stiffness is better, and the noise and vibration can be greatly reduced. (3) At the same length, the number of flange connections of spiral air duct is less, which can greatly improve the ventilation quality of the system.

Prof. Weina, University of New South Wales, Australia? Sahajwara has developed a new method of using waste rubber and plastic for steel production - polymer injection process. Wuhan Cord hose It can not only greatly reduce the environmental pollution caused by waste rubber and waste plastics, but also effectively reduce the cost of steel production. Waste rubber and plastic contain a lot of carbon. Waste rubber and plastic are put into the electric arc furnace as substitutes for carbon element. The carbon originally locked in the waste plastic hose will react at ultra-high temperature and burn with coal to become clean fuel, thus reducing greenhouse gas emissions, At the same time, it also alleviates the environmental pollution caused by using them as landfill. The advantage of polymer injection process is that by injecting polymer and coke or anthracite rubber tube mixture, the volume of slag can be increased and the foaming degree can be increased, which can extend the arc length, increase the heat transfer from the arc to steel, reduce the heat loss through the slag and side walls, and thus improve the power efficiency. This reduces power consumption by about 3%. For every 1 ton of steel, about 24% of the cost comes from the cost of electricity. After polymer injection technology is adopted, each furnace of steel is, Cord hose Where can I find it? The average total amount of carbon injected can be reduced by 10%~20%. In addition, the potential price of polymer is lower than that of coke, and the total cost of carbon injection can be saved by 15%~35%.

production Cord hose The inner and outer walls are smooth, the resistance of the air duct is small, the secondary noise is not generated during air supply and exhaust, the energy consumption is reduced, and the operation cost is saved. The product can be made on site, cut, drilled, and opened, the installation is simple, and the labor and time are saved. The user's investment cost is reduced, the construction period is shortened, the performance price ratio is high, and it is cheaper than other materials. After the installation is completed, no maintenance is required, and the maintenance cost is reduced. The key points of whether galvanized sheet air duct material galvanized sheet is corroded are mainly reflected in the following three aspects: ① The first corrosion of galvanized sheet in the entire service life cycle is the oxidation of the galvanized layer on the surface, resulting in white rust. After a little longer time, the white rust on the surface further reacts with carbon dioxide and other impurities in the humid air to form black spots. When the galvanized sheet is used for a long time and the galvanized layer is severely corroded, the steel base loses the sacrificial anti-corrosion effect of zinc, and begins to oxidize to generate red rust. Once the steel base begins to oxidize, the corrosion rate becomes very fast, and the life of galvanized sheet ends. ② In addition, there are two special corrosion conditions of galvanized sheet, namely, black stain. One is that after being used for a period of time, due to the influence of lead and other elements in the zinc coating, the galvanized sheet will become black in the matte part of the zinc flake. The blackened zinc coating still has a protective effect on the steel base, but has a certain impact on the service life. ③ Cord hose Where can I find it? It has excellent corrosion resistance in dry or pollution-free environment. However, in the polluted environment, the service life will be greatly shortened, so it is necessary to pre coat the film into color plates before use.