Steel Fire Doors Are Easy To Sag Or Twist

Their size, scale, location, quantity, material shape and combination mode are very important factors to determine the visual effect of buildings. Therefore, doors and windows should meet the requirements of daylighting, ventilation and sealing performance of steel fire doors, thermal performance, use and visual effect of buildings. Doors and windows are classified according to materials, and doors and windows are classified according to manufacturing materials, It is divided into wooden doors and windows, steel doors and windows, aluminum alloy doors and windows, plastic doors and windows, plastic steel doors and windows and other wooden doors and windows, which are easy to process and manufacture, low price, good thermal performance and sensory effect, but the wood consumption is large, the fire prevention capacity is poor, and it is easy to warp and deform in case of water, so it is generally used indoors with good effect. Steel doors and windows have high strength, less light blocking and good fire prevention. There are two forms of solid web steel doors and windows and open web steel doors and windows. Solid web steel doors and windows are no longer popularized because of their poor energy-saving effect and overall stiffness. The profile steel wall of open web steel doors and windows is thin and light. Compared with solid web steel doors and windows, it has the advantages of light weight, large drama, easy processing, convenient transportation and installation, and can save about 10% of steel, In recent years, aluminum alloy doors and windows are widely used. They are made of aluminum alloy profiles with different section models, supporting parts and seals.

Exquisite, small self weight and considerable stiffness. The airtightness of steel fireproof doors is better than that of steel doors and windows, and the deformation in use is small. Moreover, the frame materials are treated by oxidation and coloring, so there is no need to paint and carry out surface maintenance. At present, the processing and use of aluminum alloy doors and windows in China has become more popular. A series of standard products are available in aluminum alloy door and window processing plants all over the country, Special makers generally only need to provide elevation drawings and use requirements, and can be commissioned for processing. Plastic steel doors and windows are assembled from various hollow special-shaped section profiles by extrusion mechanism with polyvinyl chloride modified polyvinyl chloride or other resins as the main raw materials, light calcium carbonate as the filler, adding an appropriate amount of auxiliary agents and modifiers. They are a new variety developed in recent ten years, The thermal insulation effect is similar to that of wooden doors and windows. The form is similar to that of aluminum alloy doors and windows. It is beautiful and exquisite, has good corrosion resistance, has long service life, and does not need painting, color viewing and maintenance. However, the bending deformation resistance of ordinary plastic doors and windows is poor. Plastic steel doors and windows are made of profile steel stiffeners lined in the cavity after the plastic door and window frame profile is cut, which is made by hot-melt welding. Compared with all plastic doors and windows, It has better rigidity and lighter weight. It is a widely used door and window. Doors are classified as swing doors according to the opening mode. The swing door is connected with the door frame with a hinge on one side of the door leaf, which can be made into a single leaf, double leaves or multiple leaves. The opening direction has internal opening and external opening.

The utility model has the characteristics of simple structure, flexible opening, convenient manufacture, installation and maintenance, good tightness when closing, so it is widely used. However, the stress state of the door leaf is poor, and the steel fire door is easy to sag or twist, so the door opening should not be larger than. See the figure for the opening mode. The form of spring door is the same as that of swing door. The difference is that the spring hinge is used to replace the ordinary hinge on the side, or the ground spring is used to drive below, which can be opened in one direction or two directions and closed automatically. Considering the of use, glass is generally installed on the two-way spring door leaf for people to observe each other to avoid collision. However, spring doors shall not be used in kindergartens, primary and secondary schools and other buildings to ensure their use. The spring door is suitable for rooms with large flow of people or need to be concealed, such as the door of conference room, shopping mall and toilet. See the figure for the opening mode. Sliding door is a left-right sliding door. Guide rails and pulleys are set above the door opening, or guide grooves or guide rails are set on the ground.