LED display application fire protection technology analysis
With the rapid development of modern science and technology, China's LED display industry continues to grow at a high speed, the scale of the industry continues to expand, and technology continues to evolve. The market share has continued to grow at an average annual growth rate of 40% since 1993. However, 2012 The sudden fire incident at the Yijunyi Hotel in Hong Kong on April 21 gave the whole LED industry an alarm: while the industry is developing at a high speed, the LED display security application technology field is still short-lived, and the standardization of LED products is Standardization was once again on the agenda. In particular, the LED display fire safety application technology is the focus, so today Xiaobian leads everyone to see what factors will affect the security and fire protection of the display.
The quality of the display fire prevention technology is mainly related to the display fireproof raw materials and the box process.
The fireproof raw materials mainly include the wire, power supply, external protective structure fireproof material and plastic kit inside the display screen:
First point: In most display applications, the larger the unit area display of the display, the higher the power consumption, and the higher the stability of the wire. Among the many wire products, the wire can meet the requirements of the national standard to ensure its safety and stability. There are three requirements: the wire core is a copper wire conductive carrier, the wire core cross-sectional area tolerance is within the standard range value, and the rubber core of the wrapped wire core is insulated. And the flame retardancy reaches the standard. Compared with the general copper clad aluminum wire core, the wire core cross-sectional area is small, and the insulation rubber grade is not enough, the electric current performance is more stable, and the short circuit condition is not easy to occur;
Second point: UL-certified power supply products are also the best choice when selecting similar products. The effective conversion rate can ensure the safety and stability of the power supply load, and it can work normally even under the hot external environment.
The third point: in the material of the outer protective structure of the display screen, the display products with higher fireproof rating on the market mostly use fire-resistant aluminum-plastic composite board, which has excellent fire resistance, fire retardant and strong flame retardant. Aging performance is also very strong, melting point temperature 135 ° C, decomposition temperature ≥ 300 ° C, environmental performance, low smoke and halogen-free, in line with SGS, flame retardant B-S1, d0, t0, reference standard UL94, GB/8624-2006. The aluminum-plastic panel of the general outdoor display product aging rapidly with high temperature and rain and cold heat shock, so that the rain dew easily penetrates into the screen body during a relatively humid climate season, causing a short circuit of the electronic component to cause a fire;
The fourth point: the display fireproof raw material also has an important part, that is, the plastic kit, the plastic kit is mainly used for the unit module mask bottom shell, the main raw material is the PC+ glass fiber material with flame retardant function, which not only has resistance The burning function can not be deformed at high and low temperatures and long-term use, and will not become brittle and cracked. At the same time, it can be combined with the glue with good sealing performance, which can effectively block the rainwater from the external environment from penetrating into the interior and causing short-circuit fire. .
In addition to the internal raw materials will affect the fire prevention effect, the external configuration and design is also very important, but the external configuration mainly involves the heat dissipation in the fire prevention problem. At the same time, the exhaust fan and the air conditioner are configured to cool and cool the inside of the screen body. It is recommended that every 8-10 square meters of 1P air conditioner ensure that the temperature inside the screen is kept at a normal temperature. If the air conditioner or exhaust fan is not in place, the heat treatment will be uneven, which may cause safety hazards in the screen due to temperature increase. At the same time, many LED companies simply test the spray waterproof test in the external environment when testing the protection level of the cabinet. The durability and strength of the waterproof effect are yet to be verified, so that after the display product has been used for some time, Water seepage occurs, which is an important reason why outdoor displays are prone to fire or have a short service life. In response to thunderstorms, the screen device arrester is also an indispensable tool to avoid lightning strikes and burn out the internal components of the screen. It can directly direct lightning into the ground without affecting the screen.
All of the above are internal reasons for the display. Of course, we can't ignore the human factors caused by the later maintenance process. For example, in the subsequent maintenance work, the operators did not follow the strict process flow (the module screws are not tightened, the wire is not If the polarity is reversed, and conductive objects are left behind after the operation, it is easy to cause a fire.
The exact cause of the fire in the Hong Kong hotel display remains to be investigated, but it is not possible to adopt a negative attitude towards the application of LED display products in Hong Kong. Although the entire industry standard has not yet been established, the industry has done a good job. There are still many LED companies. For example, the display products of Shenzhen Zhouming Technology have obtained the flame retardant fire test of building materials of British Test Center BS476. The products of Zhouming Technology (SMD outdoor module, outdoor light bar module) have passed the UK. Exova Warringtonfire Test Center tested and passed the British standard BS476, SMD outdoor module product fire rating is 2 (certificate number: 309548), outdoor light bar module product fire rating is 1 (certificate number: 317177). These meet international certification standards Display products are the leader in the LED industry. We should look to these leading model companies, demand themselves with high quality and strict specifications, and guide the healthy development of the industry, thereby enhancing the international competitiveness of the entire industry and becoming international. .
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