See an interesting mystery: the good old man in the surveillance industry - playing a security product. After much deliberation, the answer is none other than explosion-proof cameras. In the security industry, only explosion-proof cameras can coexist peacefully with more than 100 "flamy" flammable gases. In recent years, the state and production units have paid more and more attention to "safety production". How to meet the monitoring and avoiding the danger has become a key issue. Explosion-proof cameras play an important role in monitoring and controlling the production and storage of flammable and explosive dangerous goods.
The initial demand for explosion-proof cameras came from underground coal mines, especially in the past decade. With the industrialization of the country, the demand for explosion-proof requirements has expanded to various fields—petroleum, chemicals, navigation, aerospace, metallurgy, scientific research, and military industries. Very different requirements and more targeted, especially the rapid development of China's petrochemical industry, accelerated the development of explosion-proof industrial monitoring, explosion-proof industrial amplifying intercom products. Explosion-proof cameras also began to be widely used in various fields.
First, the special place of explosion-proof camera
1, the difference between explosion-proof cameras and ordinary cameras
Explosion-proof cameras are essentially indistinguishable from ordinary industrial cameras in their optoelectronic structures. Its most important feature is the use of one or more explosion-proof forms to process industrial cameras, allowing them to be monitored in an inflammable and explosive field environment.
2, the difference between explosion-proof cameras and riot cameras
The concept is different - Explosion-proof camera is an explosion-proof monitoring product. It is the cross product of the explosion-proof industry and the monitoring industry. Because the conventional camera products cannot be used in high-risk flammable and explosive sites, it needs to have explosion-proof function and is related to the authority issued by the national authority. The product of the certificate can be called an explosion-proof camera.
Riot cameras are also known as high-security cameras, anti-impact cameras, anti-strike cameras, and vandal-proof cameras. As the name implies, a riot camera is a camera that can still ensure the normal operation of components under the attack of external violence. Its characteristic is that its outer shell has a strong impact resistance.
Different application areas - Explosion-proof cameras in many companies or research departments such as petroleum, chemical, coal and scientific research, military, etc., may often leak and spill out various kinds of processes during experiments, production, processing, transportation and storage. Flammable and explosive gases, liquids, and dusts and fibers of various types, which, when mixed with air, will become a mixture that is prone to explosion hazards. Places near it are also places of varying explosion hazards, and The explosive mixture concentration may increase continuously. When the concentration of explosives reaches the critical point of explosion, serious accidents such as explosions and fires will occur once the spark source, electric arc and high temperature of the ignition source are raised, causing casualties and property losses. In order to achieve the application of monitoring in the flammable and explosive field environment, explosion-proof cameras came into being.
The application of riot cameras is mainly focused on finance, prisons, commerce, subways, mining, and relatively hostile environments. It can not only be used to deal with man-made vandalism, but also can deal with harsh natural and production environments and reduce them. The damage to the camera.
The production process is different—the current international mainstream method of explosion-proof cameras is explosion-proof, and explosion-proof explosion-proof cameras are “explosion-proof protective covers†and ordinary cameras and lenses. Vandal-proof cameras are mostly hemispherical or spherical, so the camera’s The manufacturing process of the transparent protective cover and the upper shell will become a key factor that directly affects the ability of the camera to prevent riot.In order to meet the requirements of anti-violence, more and more transparent protective covers are used in polycarbonate (PC) engineering. Made of plastic, there are also some manufacturers of products using polymethyl methacrylate (PMMA) engineering plastic (Acrylic, Acrylic) dome cover.
Second, the type of explosion-proof camera
At present, there are three types of explosion-proof cameras on the market: intrinsically safe, positive pressure, and flameproof.
"Intrinsically safe" starts from limiting the energy in the circuit. Inside the camera, the potential spark energy is reduced to the ignitable prescribed gas mixture energy through reliable control circuit parameters, and the wire and component surface heating temperature is limited to the specified gas mixture. The lighting temperature. All circuits inside the camera are intrinsically safe circuits that cannot ignite a prescribed explosive gas environment by any spark or any thermal effect that is generated under standard conditions (including normal operation and specified fault conditions). "Cameras" are relatively expensive and are rarely seen on the market.
The "positive pressure type" explosion-proof type is to maintain continuous air or inert gas in the camera to restrict the flammable mixture from entering the camera through the housing.
The most common type of explosion-proof camera on the market today is a “flameproof type†explosion-proof type, which completely encloses the parts of the camera that may ignite the explosive gas mixture in a single enclosure whose outer shell can withstand any joint or structural gap through the enclosure. The flammable mixture that penetrates into the interior of the enclosure explodes internally without damage and does not cause ignition of an external explosive atmosphere formed by one or more gases or vapours. Place parts of the camera that may generate sparks, arcs, and dangerous temperatures into a flameproof enclosure that isolates the interior of the camera from the surrounding environment.
There is a gap in the flameproof enclosure. Due to the respiration of the electrical equipment and the gas permeation, an explosive gas mixture may exist inside. When the explosion occurs, the enclosure can withstand the explosion pressure generated without damage, and at the same time, the gap of the shell structure can cool the flame and lower the flame. The speed of flame propagation or the acceleration of the chain is such that flame or dangerous flame products cannot ignite the external explosive atmosphere through the flameproof gap, thereby achieving the purpose of flameproof.
III. Installation of explosion-proof cameras in special occasions
Natural Gas Station Installation Explosion-proof Camera Precautions
1. The inlet of the explosion-proof camera must be sealed with rubber seals. It is forbidden to use other methods such as filled sealant and asbestos rope. It is forbidden to fill any substance in the cavity. Explosion-proof performance is forbidden; For the convenience of connection, the sealing ring at the inlet and its matching pressing nut are forbidden to be discarded; multiple single-stranded wires are forbidden to merge and enter the inlet port through the single-hole elastic sealing ring. The oil on the rubber seal should be scrubbed to avoid aging deterioration.
2. It is forbidden to modify the structure of the explosion-proof camera, parts and components and the internal wiring of the equipment. The fastening bolts shall not be interchanged or missing, and the elastic gaskets and metal gaskets of the extra inlet and outlet ports must be kept sealed at the factory, and the compression nut should be tightened to seal the inlet.
3. It is forbidden to carry live electrical equipment and lines in explosion hazardous locations, and it is forbidden to send electricity or power outages. And a warning sign “Someone working, no closing†should be hung on the offsite. During inspection and maintenance, if the explosion-proof camera is disassembled into a safe area, the equipment power cable end of the site shall be properly handled and shall not be powered on.
4. During the daily operation and maintenance inspection, the explosion-proof camera housing should be avoided as far as possible, and the power must be cut off when it must be opened. If the explosion-proof enclosure is opened, the explosion-proof surface shall be properly protected and shall not be damaged. During the inspection, the explosion-proof surface shall be placed upwards, and shall not directly touch the ground. After the scene is cleaned, it shall be coated with a phosphatizing paste or 204 anti-rust oil.
5, all explosion-proof cameras should establish equipment files, from the equipment installation, commissioning, operation, maintenance, until the equipment explosion-proof degrade, scrapped. Various technical data of different periods should be collected, archived, and numbered one by one on the equipment.
Precautions for selection and installation of explosion-proof cameras at gas stations
For gas stations, gates, oil storage tanks and other key safety precautions in gas stations, the selection of front-end cameras generally uses explosion-proof shield cameras and considers nighttime auxiliary lighting devices in addition to the general requirements of explosion-proof guard cameras. In addition, explosion-proof hoods and explosion-proof camera PTZ explosion-proof levels have corresponding requirements, but also requires a combustible gas detection system, when the detection reaches a certain concentration, the camera will be the corresponding monitoring, the trigger sound Light alarm.
Gas stations have strict requirements on the installation of front-end equipment (explosion-proof cameras). They also require the products to be stable and reliable during the use process, and do not require frequent maintenance. Because the gas station is a flammable and explosive environment, special attention must be paid when installing peripheral environmental monitoring equipment to the inability to use flammable tools and flammable installation methods, and to avoid live installation. Explosion-proof electrical equipment that is higher than or equal to the level or group of oil vapor in the corresponding area must be used in the explosion hazard area of ​​the gas station. The connection and laying of wires must meet the explosion-proof requirements. The connecting wires are usually protected with explosion-proof hoses or galvanized tubes.
From the experience of monitoring engineering, it is found that there must be a stable and stable monitoring system. A stable power supply must be available. Because of the unstable electricity voltage, the outskirts may even experience blackouts. The gas station, as a 24-hour business unit, is not allowed. There are monitoring blind spots. Therefore, an on-line UPS power supply should be designed at each gas station to meet the monitoring needs.
In addition, gas stations installed with security systems are more or less vulnerable to lightning hazards. As a result, gas stations should be equipped with lightning receptors, deflectors and grounding devices. Prohibited lightning rods should be installed at gas stations that are open and surrounded by buildings. There are no less than two ground points in the tank, and tanks, pipes, and other metal accessories are electrically connected and grounded. When the thunderstorm occurs, the unloading operation should be stopped, and the tanker parked at the gas station should be grounded.
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