The main function of the security door is anti-theft, followed by decorative beautification. When purchasing, you should focus on the performance and quality of anti-theft. As far as the production of security doors is concerned, the production in the south is more focused on the appearance of the style, the fashion is good-looking, while the northern ones use some material, but the process is relatively thick, and it is often difficult to meet the aesthetic needs of people. When purchasing, you should take into account the appearance and substance, it is best to buy brand-name products. A qualified security door, the materials and technologies used are all prescribed, and if the sales price is very low, it will certainly not meet the anti-theft requirements. This point should be paid attention to in the rural market. Otherwise, it takes a few hundred dollars to buy a door. The loss of the door due to the quality problems of the door is often more than a few hundred dollars. The appearance and composition of a qualified security door - 1. Door size and opening direction: Household standard doors generally have four specifications, which are represented by four digits consisting of the width and height of the building opening. For example, when the width of the door hole is 1 meter and the height is 2.1 meters, the specification is called 1021, and the commonly used specifications are 0920, 0921, 1020, 1021, and the like. The opening direction of the door is divided into an inner opening door and an outer opening door. The inner opening door and the outer opening door are further divided into a left opening and a right opening, and the user can select the opening direction of the door according to the direction of opening the door. 2, the surface quality and safety of the door: the materials used in the qualified anti-theft security door are in line with the national standards. The thickness of the steel frame for the door frame of the steel security door should not be less than 2 mm. The thickness of the steel plate used in the front and rear panels of the door leaf is Between 0.8 and 1 mm, the inside of the door leaf is provided with a skeleton and a reinforcing plate. The well is filled with a filler such as a foaming agent, asbestos, honeycomb paperboard, etc., so that the front and rear panels of the door body are organically connected together to enhance the overall strength of the door body. When the object is knocked on the door, a "beep" sound is emitted, and the lock used on the door body is an anti-theft lock. In addition, the surface of the door panel should be treated with anti-corrosion treatment, generally for painting and spray coating. The surface of the paint layer should be free of air bubbles and uniform in color. The weight of the door is generally above 40 kg. Most doors are also embedded with rubber sealing strips on the door frame. The door does not emit a harsh metal collision. 3, the safety of hardware: First, the security lock. The anti-theft lock is the most important part for the door. The performance of the anti-theft lock is directly related to the safety of the door. The anti-theft door generally uses a mechanical lock and an electronic lock. When the anti-theft lock is selected, it must be noted that the product must be certified by the national designated authority. The anti-theft lock should have the functions of anti-drilling, anti-saw, anti-smashing, anti-pull, anti-shock and anti-technical opening. The locks used on the security door are divided into a single point lock and a multi-point lock. The so-called single point lock means that the lock locks the door through the lock point of the lock itself. Multi-point lock means that in addition to itself, the auxiliary lock is driven at the same time to form a plurality of lock points and distributed around the door frame to enhance the anti-smashing performance. The anti-theft lock bolt used by the anti-theft door has a protruding length. The extension length of the A-class anti-theft door should be no less than 14 mm, and the B-class should be no less than 20 mm. The outer casing of the anti-theft lock is generally made of steel plate of not less than 2 mm thick or made of a material with a certain strength, and the folded edge and the opening should be welded or integrally stamped. In the key parts corresponding to the main locking tongue (plug) transmission device and the lock body, there should be protection measures such as anti-drilling steel plate or anti-drilling sleeve. The area of ​​the anti-drill steel plate shall be not less than 15 cm in diameter (from the locking point to the edge of the steel plate). Hinge. The hinge is a component that connects the door and the door frame to each other, and mainly serves to support the door body, and at the same time has a certain anti-theft function. At present, the hinges used in security doors generally use built-in and external hinges. The built-in hinges are suitable for externally opening doors, the external hinges are suitable for internal opening, and the internal hinges are external hinges. The hinge shaft diameter is generally larger than 12 mm. Rolled steel plate, the closed edge must be welded. Factors to consider when purchasing a security door - 1. When ordering or purchasing a security door, you should purchase qualified products from the manufacturer who has obtained the “Production License Registration Certificate†issued by the public security situation. 2. Check whether the manufacturer or the merchant has the qualified inspection report of the recent inspection by the authoritative inspection agency. In particular, it is necessary to pay attention to whether the production batch number and model specifications on the inspection report are the same as those on the physical object. 3, the security door must have product tag code, the content includes: First, the security door sign: FAM; Second, the security level: A, B, C three levels, of which C-class anti-theft performance is the highest, B-level second, A-level lowest, The A grade is more suitable for general household use. (Use general hand tools to break and open the security door. The allowable time is: A level is not less than 15 minutes, B level is not less than 30 minutes, and C level is not less than 45 minutes). 4. See if the material is thick. The steel plate frame is made of steel plate, the surface of the steel plate has high surface finish, no rough and blistering, and the thick steel plate is squeaky and squeaky, and its weight is roughly determined, and the door leaf is roughly determined to be solid. 5. The structure should be reasonable. At the same time, the workmanship is fine and the solder joints are even and dense. 6. When the door is opened and locked, whether the lock is opened is flexible. When opening or closing the door, the door leaf is easy, there should be no stuck or touching the door frame and making a sound. 7. Whether the gap between the door leaf and the door frame is too large or too small, the normal gap should be: the left side, the right side and the upper side gap are not more than 3 mm, and the lower side is 5 mm. 8. The door leaf and the door frame need to be equipped with anti-theft chain. The installation of the anti-theft chain is firm and the handle is flexible and firm. 9. The name, specification, quantity, price and amount of the plastic-steel window must be indicated on the invoice and contract. 10. Understand the name, address, contact person and telephone number of the sales unit and manufacturer, so that the quality problem can be solved in time. 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The structure of the security door and the factors that should be paid attention to when purchasing