At present, pc plastic LED guardrail pipe waterproof as long as it is sealed and waterproof, so manufacturers have come up with strange tricks, so the sealing method emerges endlessly, the factory is through the flood test, but the process will still enter the water, or even cracked pipe, then why? Let Xiaobian come to answer this question for everyone.
Because the LED guardrail tube is affected by temperature changes after installation, the air pressure in the tube will constantly change with temperature. When the tube is expanded at high temperature, the tube shell will be squeezed at low temperature, and the sealant of the wire inlet and end cap will occur. Physical deformation, small cracks will appear after a long time, and when the temperature rises, it will leak, and when it cools, it will inhale, then the moisture attached to the tube will slowly enter the tube.
Generally speaking, the process of water inflow is divided into: temperature change, gas pressure generation, extrusion of the outer tube, sealing failure, and negative pressure water absorption. In addition to temperature changes, in addition to temperature changes, there is also solar radiation heating, greenhouse effect heating, tube circuit work heat, when the guardrail tube seal waterproof enough to do well, the tube does not leak, then the crack will increase.
In addition to temperature changes, there are also solar radiation heating, warming of the greenhouse effect, and heating of the internal circuit of the pipe. When the guardrail is sealed and waterproof, it is good enough. If the pipe does not leak, the cracked pipe will increase accordingly; The low temperature, summer sun exposure and greenhouse effect of the guardrail tube has more than 60 degrees of high temperature, the conventional sealed structure of the guardrail tube will change from atmospheric temperature of -25 degrees to +65 degrees, 0.3 atmospheres, the tube can only be leaked without cracking, Influent water is a matter of time, the traditional practice of strengthening the seal against water, from the above analysis can not cure the fundamental. LED guardrail tube manufacturers still have to grasp the innovation and produce high-quality, high-strength LED guardrail tube products for market use.
At present, the sealing principle of the plug used in the led guardrail tube is:
1. Traditional rubbering, but this method pollutes the environment, costs time and labor, and can't stand the wind and rain, and the cold weather causes the gel to age and crack and water damage.
2. It is the principle of sealing the waterproof rubber ring to make the led guardrail tube double waterproof, which can withstand 1 atmosphere, which is equivalent to the water pressure of 10 meters deep but at the same time more serious problems arise. The first is due to the height of the guardrail tube. The heat inside the seal accelerates the aging of the light source and the electronic circuit. Second, the pressure of the positive and negative pressure on the guardrail tube is often repeated, which accelerates the fatigue of the waterproof plug and eventually leads to failure of water.
It can be seen that if you want to be really waterproof and improve reliability, it is not enough to rely on waterproof plugs. If you want to waterproof, you need to breathe.
led guardrail because of its energy-saving, environmental protection, long life, etc., had become the new darling of today's technology, as outdoor lighting led guardrail light due to its colorful, ever changing in popularity, it has already started in water features lighting, Bridges, landscape projects, architectural decoration and other occasions have succeeded in becoming the mainstream products for outdoor landscape lighting. The led guardrail tube currently has dozens of varieties of o, d-type and special-shaped three series. It is said that there are nearly a thousand of led guardrail lamps in the country. Only Zhongshan has several kilometers of guardrail tube lights every day, due to the Olympic Games. And the demonstration role of the World Expo, coupled with the product and municipal engineering and government image performance, the application of its extensive development is extremely unprecedented and unprecedented, will certainly drive the led fence tube landscape lighting market from the first-tier cities to the secondary and tertiary cities, gradually Form an emerging sunrise industry.
However, since the birth of the LED barrier, it has encountered various quality problems. First of all, because it is mostly municipal image engineering, it is a government group procurement. In addition to the government and other owners' low-price bidding strategies for the project, it also lacks a strict supervision system for construction and acceptance, resulting in “installation is good. The short-term behavior of "on the line". From the manufacturer, because of its low technical content, low barriers to entry, many of them are family-run enterprises in the rough rotten, not paying attention to product quality, just a low-cost competition leading to the market The quality is generally inferior, seriously ruining the reputation of the led guardrail tube. How to solve the waterproof problem of led guardrail tube lamp is a problem that the manufacturer of the guardrail pipe factory, the lighting engineering company and the owner urgently need to solve, to reverse the bad impression on the led guardrail tube and reshape its original brilliance.
Led guardrail tube lights are mostly used for outdoor lighting. Due to the variation of temperature difference between four seasons and day and night, huge pressure changes are generated in the lumen of the guardrail. Some analysis shows that a d50*50mm, length 1 meter led guardrail tube, the inner surface area of ​​the tube is about 0.17 square. Meter, when the temperature is raised from 25 ° C to 45 ° C, the pressure on the inner wall of the pipe is 6.8 kpa × 0.17 square meters = 1156 Newtons, about 118 kg positive pressure. When the temperature drops to 17 degrees at night, the gas pressure in the tube is 98.6 kPa, the negative pressure generated at atmospheric pressure is 2.725 kPa, and the reverse pressure is 463.25 Newtons, about 47 kg negative pressure. Therefore, the LED guardrail tube lamp is subjected to a strong positive and negative pressure alternate test every day. The actual LED lighting night scene project sometimes uses a larger diameter, and the actual ambient temperature changes are more severe. There is a low temperature of -30 °C in northern China. In the southern outdoor sun, there is a high temperature above 60 °C. The temperature difference of 90 °C will cause a pressure of about 0.3 atm inside and outside the guardrail tube. It is not difficult to understand that the conventional guardrail plug will open soon. It is very common to fall off the water and cause the circuit to burn out. The water in the plug is in the water, the water in the outlet is in the water, and the water in the cracked pipe has long been a lingering shadow of the whole LED lighting industry. Once the LED guardrail tube light enters the water, it is equivalent to the end of the life of the LED lamp. The longevity advantage is turned into a bubble. Because these lamps are generally installed in outdoor high-altitude, the operation is extremely inconvenient, the cost of repair and replacement is expensive, and even the project acceptance cannot be passed many times. Some projects just took the inspection and close. The waterproofing of the above various kinds of guardrail tubes has become a major technical problem in the industry.
The led guardrail tube lamp has two inlets; one is the plug on both sides, and the other is the inlet port. Because the wall of the guardrail is thin and soft, the plastic tube is easily deformed under pressure, and the plug and the inlet are difficult to The force is generally glued. Because the adhesive and plastic tube have poor affinity, in the outdoor sun exposure, wind and rain environment, the glue will leak quickly; sealing with glue is not only time-consuming, laborious, and polluting. The environment is even less forceful, and the replacement of the pipe is almost impossible to repair. So people take a variety of measures: such as pc board full potting, installation of internal and external plugs, active waterproof technology, ultrasonic welding technology. The above technology plays a certain role to some extent, but the waterproofing and tensile durability design of the system cannot fundamentally solve the waterproof problem of the inlet and the plug, because these two parts are not only required to be strict but also require a certain strength and Pulling force, theory and practice require that the plugging force should be more than 30 kg, and the pulling force of the outlet should be more than 10 kg (considering the construction delay).
Ultraviolet light is the main reason for the yellowing or cracking of led guardrail tubes. Products with good quality will use materials that have increased UV resistance, such as ge, Bayer and other materials, with inferior or mixed nozzle materials, not to be resistant to UV rays, but also consider The internal stress of general PC or nozzle material is selected, which will lead to natural cracking and interlocking fission reaction of the guardrail tube. Experienced companies will choose thermostatic protection during injection molding to minimize internal stress.
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