How to choose an explosion proof camera
The explosion-proof camera is a special kind of camera developed to realize the application of industrial television in a flammable and explosive environment. Although the explosion-proof camera has now been more widely used, but also more and more engineering friends to understand and accept the explosion-proof camera; but the selection and installation of explosion-proof cameras still have a lot of details need attention and clarification.
Explosion-proof camera development
Oil, chemical, coal and scientific research, military and other countries, many industrial enterprises or research departments in the experimental, production, processing, transportation and storage of the process, often possible to leak and overflow a variety of flammable, explosive Gas, liquid and a variety of dust and fiber, such substances mixed with air, will become prone to explosive hazard mixture, it has become a place around the different places of explosion hazard. Due to factors such as site conditions, the concentration of explosive mixtures may continue to rise. When the concentration of explosive materials to reach the critical point of explosion, once the detonation source - spark, arc and high temperature will produce explosions, fires and other serious accidents, resulting in casualties and property damage.
3,In order to achieve in the flammable and explosive environment of the application of industrial television monitoring, explosion-proof camera came into being. The initial demand came from coal mines. Especially in the past decade, with the national industrialization process, the demand for explosion-proof requirements to expand to various fields - oil, chemicals, navigation, aerospace, metallurgy, scientific research and military industry and other needs even more, different, more targeted, In particular, the rapid development of China's petrochemical industry, accelerating the explosion-proof industrial monitoring, explosion-proof industrial loudspeakers talk about product development. Explosion-proof cameras also began to be widely used in various fields. It is noteworthy that, with the general situation of the electronics industry is different from the development of China's explosion-proof cameras in terms of time in the international industry is quite early, in terms of technical level, is always no less than foreign similar products.
On the field of explosion-proof, explosion-proof research in China has always been in the forefront of the world, the state developed a series of explosion-proof standards. Explosion-proof grade has been the world's major countries corresponding to the explosion-proof grade standards, and many parameters higher than Europe and the United States; China's explosion-proof equipment management, is also very strict. Such as explosion-proof product design review issued after the "explosion-proof certificate", explosion-proof product production must hold the "production license" and so on.
Most of the field of explosion-proof monitoring facing the environment is poor, located in remote, harsh conditions of installation, monitoring a wide range of issues. Traditional split-type explosion-proof camera due to the huge volume, installation and debugging complex, simple function, slow speed and other aspects of the restrictions, the explosion-proof degree of protection and stability of the technical performance are subject to the corresponding restrictions, and set of head, Decoder is equal to one, standard heater, fan, sun shield, wipers and other all-weather accessories explosion-proof integrated camera can solve many of the above problems. Most of the manufacturers interviewed said that the combination of PTZ, camera, decoder, infrared light explosion-proof integrated camera is very popular with users.
Explosion-proof ball machine function more robust
As the early explosion-proof camera there is a slow speed PTZ, preset accuracy is not high, there are dead spots and other aspects of monitoring, new models such as explosion-proof high-speed ball / hemisphere camera also began to get involved in the field of explosion. Explosion-proof high-speed ball / hemisphere, in addition to preset position, automatic cruise, PTZ infinite continuous rotation and other characteristics of the gradual increase in the field of explosion-proof monitoring can also achieve to the mobile detection, automatic tracking, alarm linkage and other intelligent direction.
On the motion detection, automatic tracking function. The strength of the manufacturers to launch the explosion-proof camera on the motion detection function will pay attention, and may join the vibration alarm and other functional modules. Motion detection refers to the tracking target in the movement of the detection, when the screen changes, such as someone walked through a certain set, the system will automatically make the appropriate treatment, that is, the alarm signal. Explosion-proof camera tracking function is actually the image analysis function, depending on the PTZ speed, positioning accurate, if the explosion-proof camera PTZ speed is slow, positioning is not allowed, it can not automatically track an object. This function is usually through the software accessories to set, background operation control to achieve. Changzhou Sheng and the new explosion-proof high-speed ball camera and Lidas Systems Co., Ltd. thermal imaging robot with optional mobile detection and automatic tracking function.
On the alarm function, explosion-proof camera self-test alarm is very important. Such as PTZ self-test process was blocked or self-test is not in place, then the product will be difficult to play its practical role. Such as explosion-proof cameras for environmental extreme oil fields, mines, the winter may be minus 30C. PTZ shaft, etc. may be frozen, explosion-proof camera if there is no self-test, it may stop working. So, self-test alarm is the explosion-proof camera mechanical stability and smooth operation of an important guarantee. Some explosion-proof cameras also have alarm ports, alarm interface and other alarm devices connected, encounter abnormal circumstances, you can achieve alarm linkage function. If the explosion-proof camera lens is artificially occluded, it will alarm to ensure that monitoring can proceed smoothly.
In addition to the above three aspects, in order to enhance the environmental adaptability of explosion-proof cameras, usually need to increase the sun shield, heaters, filters, wipers, fans / semiconductor refrigeration devices and other value-added accessories to ensure the stability of the equipment and monitor the clarity of the screen The In the strong sunshine, such as the desert mine mining site, the use of sun shield can effectively reduce the temperature of explosion-proof cameras, the average can be above 6 ° C. In the cold winter or ultra-low temperature conditions, the built-in heater can be automatically heated to ensure that the explosion-proof camera to work properly, such as the world of technology products is -10 ° C start automatic heating, explosion-proof group of many products is less than 1 ° C Start heating around left and right. Dust can usually be cleaned by a wiper, so as to achieve enhanced camera life, reduce the failure rate, and thus ensure that the screen clear function. Due to the sealing of the explosion-proof camera itself, the fan / semiconductor refrigeration device can be used to a certain extent, heat dissipation. Of course, these value-added accessories can be selected according to customer needs and the actual environment.
In addition, a flameproof intelligent vision sensor consisting of flameproof camera housings, built-in lenses, camcorders and intelligent vision servers has also become an effective assistant in the field of coal mine monitoring. The intelligent vision server has a complete intrusion detection analysis module embedded in VTD ™ intelligent vision analysis technology that automatically detects a variety of individual intruders or vehicles. Once the zone is set up, only the intrusion that meets the specified characteristics will cause the alarm, and other non-conforming invasions will be ignored. At present, due to the emergence of explosion-proof zero-light black night vision camera, assembled into an explosion-proof intelligent vision sensor in the coal mine as much.
Principle and Selection of Explosion - proof Camera
As far as the explosion-proof camera itself is concerned, there is no essential difference between the photoelectric structure and the conventional industrial camera. Characterized in that the industrial camera is treated with one or more explosion-proof types so that it can be applied in a flammable and explosive field environment.
The early explosion-proof cameras were dominated by intrinsically safe and positive pressure. The intrinsically safe explosion-proof camera is characterized by intrinsically safe handling of the circuit of the camera, and the electrical line output or input is designed to control the energy below the energy that causes the hydrogen to ignite and cause it to cause no electricity in normal operation Sparks, arcs and high temperatures, so as to avoid detonating explosives. This type of explosion-proof camera structure unit cost is too high is the biggest drawback, in addition to the future is not conducive to the upgrade. Positive pressure type is the early US Department of explosion-proof camera products commonly used structure, the use of maintenance is very inconvenient, such as not careful maintenance, detonating the risk is quite large. This structure is currently seen in addition to a small number of Taiwan manufacturers are still manufacturing, the basic explosion-proof camera industry has been completely eliminated.
Explosion-proof electrical explosion-proof type, although more, but not all suitable for explosion-proof camera. Such as oil-filled, sand-filled, etc., in the explosion-proof camera is simply can not be used.
At present, the international mainstream of explosion-proof cameras is flameproof. Characterized in that a conventional conventional camera is placed in a specially made housing which has the effect of isolating the spark and arc generated from the electrical components in the shell from the explosive mixture outside the shell and capable of withstanding the explosive mixture entering the shell Electrical equipment sparks, arc detonated when the explosion pressure, and the shell is not destroyed; at the same time to prevent the shell of explosive products to the shell outside the explosive mixture of explosives, will not cause the explosive mixture outside the shell combustion and explosion. This is a flameproof shell of the camera is "explosion-proof explosion-proof camera." And this special shell called "explosion-proof shell", we usually call it "explosion-proof camera cover."
In other words, the explosion-proof explosion-proof camera is equal to "explosion-proof camera cover" + ordinary camera, lens. In this case, as long as the size is appropriate, engineers can freely choose the built-in camera, lens, while the cost is also reduced. For future maintenance, but also a lot of convenience, turn off the power can open the cover to remove the camera, lens.
This "explosion-proof camera cover" is usually made of high-strength stainless steel with anti-explosion pressure and impact, extremely strong. Good quality products in the wall thickness of more than 5MM, than the level of the anti-riot camera has gone beyond.
In many cases, stainless steel housings are superior to aluminum housings, such as corrosion resistance. Especially in the case of fire survivability is much better.
Give these two examples, mainly to illustrate the excellent quality of the explosion-proof camera's good viability, is not recommended to try this extreme environment. For the explosion-resistant environment, our usual practice is to thicken; corresponding to high temperature combustion environment also has a dedicated model.
In addition, the market there are so-called airtight explosion-proof protective cover, but in accordance with the requirements of this airtight shell is not free to remove, to ensure permanent air tightness. Such as disassembly, the seal must be re-airtight experiments. Taking into account the construction site is not airtight experimental conditions, this "thin skin stuffing" way of security is very questionable. Even if the factory is installed when the camera and do airtight experiments, after the maintenance is to open the shell, the permanent air tightness can not guarantee, very dangerous.
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Add: Qinjiang Road, Xinbei Industrial Zone, Changzhou,JiangSu,China