Let's take a closer look at the mine accidents that have occurred in China since this year. On March 29 and April 1, 2013, the Babao Coal Mine of Tonghua Mining (Group) Co., Ltd. in Jiangyuan District, Baishan City, Jilin Province had two consecutive occurrences. The gas accident caused a total of 35 deaths, 16 injuries and 11 losses; at 22:00 on April 5, 2013, a large water permeability accident occurred in Yunda Coal Mine Co., Ltd. of Weng'an County, Qian'an Buyi and Miao Autonomous Prefecture, 6 people were killed and the direct economic loss was 10,302,800 yuan. At 14:15 on May 11, a gas explosion occurred in Taozigou Coal Mine, Lu County, Luzhou City. Since 2010, China has successively experienced Shenhua Luotuoshan Coal Mine Permeability Accident, Shanxi Wangjialing Coal Mine Permeability Accident, Henan Yichuan Coal Mine Gas Explosion Incident and many other major coal mine safety accidents. Fresh life is far away from us, can't we do something to make people's production and property more secure? First of all, as far as the monitoring system of coal mines is concerned, there are many problems at present, if the related electrical equipment systems can Doing a good job can also prevent similar things from happening at the source. Coal mine managers' indifference to life, negligence of safety personnel, illegal operation of operators, violation of safety regulations by underground personnel, etc., can directly or indirectly cause coal mine safety accidents, but most of China's coal mine safety monitoring and control systems and equipment have problems Not to be ignored. We dare not say that how good and how informatization can be done can avoid the occurrence of mining disasters. After all, the reasons for the formation of the mine disaster are too complicated, special industries, management failures, profit-making small coal kilns. But if the informatization is done better, according to professional explosion-proof electrical equipment, explosion-proof cameras, etc., at least when the accident occurs, workers can run earlier, or rescue workers can find them faster. At present, there are four major problems in coal mine movement monitoring system: 1. Most coal mine safety monitoring and monitoring equipment is backward and aging. The large-scale installation of coal mine safety monitoring and control system in China was in the 1980s and 1990s, and the product was the first or second generation of coal mine monitoring equipment independently developed by China. Although some state-owned large and medium-sized coal mines have upgraded these equipments and installed a new generation of digital monitoring systems, most coal mines are still using old-fashioned equipment and machines. Therefore, there will be hidden dangers of safe production. Regular and on-time equipment inspection and maintenance can easily cause safety accidents. 2. The monitoring system reformed by information and the new generation digital monitoring system can not adapt well to the underground environment. The informationization and automation transformation of many coal mine monitoring and control systems in China have not taken into account the actual situation of the underground. Although they have achieved a large number of functions such as data collection, real-time transmission, processing and display, their equipment also has strict requirements for the underground environment . For example, the coal mine face is the core of coal mine production, and is also the place where the environment is the worst, people and equipment move most frequently, and accidents occur frequently. However, the transformation of coal mine informatization uses wired industrial Ethernet as the core, that is, the transmission of monitoring and monitoring signals on the working face is wired, but because the working face is a constantly moving working environment, the wired transmission method is difficult to adapt to this continuous In the moving and changing work site, various factors cause the transmission cable to be damaged and torn off from time to time. In addition, the monitoring of the mined-out area of ​​the coal mine working face is more unlikely to be carried out by wired transmission. 3. The coal mine safety monitoring and control system is independent and has not formed a joint force. The first batch of KJ series monitoring systems in China were developed by many scientific research units. The new generation of digital monitoring systems developed in China in the late 1990s were also independently produced by different enterprises and institutions. These products have no unified standards and no unified interface, which makes the system unable to be used in a unified manner, causing problems such as missing data in the monitoring project and normal communication between the systems, resulting in the emergence of hidden security risks. 4. The new sensor technology has not been fully applied to downhole detection. Taking gas detection as an example, most existing coal mine gas monitoring devices mostly use electrochemical methods, which have very high requirements on chemical components. The service life of general electrochemical components is only tens of hours, and it needs to be replaced frequently to ensure the accuracy of the monitoring information. Once the gas inspectors are not replaced regularly, it is easy to cause safety hazards. The problem of coal mine monitoring system has existed for a long time, so what advances have been made in safety precautions? Let ’s not talk about small coal kilns. As far as we know, most large and medium-sized state-owned coal mines do not have wireless digital sensors. Related people said in an interview with this reporter that the state-owned large and medium-sized coal mines "can do informatization, as required." So, we can only think that the "requirements" need to be improved. "No way, some of the standards were set more than ten years ago, and the latest is also around 2006. Last year, the country's work on the revision of the coal industry standards has begun." Zhao Duan said. PradeepK.Mohanty and MoiseNdoh first proposed the use of WSN in coal mine underground lanes to realize the tracking and positioning of coal miners and underground environment monitoring. In China, China University of Mining and Technology has received funding from the 2007 National Natural Science Foundation of China “Key Technology Research on Wireless Sensor Networking in Coal Mine Faces†and the 2009 National Natural Science Foundation of China Project “Long-distance WMSN Mine Multimedia Disaster Relief Communication Systemâ€. Wireless sensor networks are used in underground monitoring and disaster relief in coal mines; the University of Science and Technology of China has funded a project under the State Development and Reform Commission to study "a linkage system for underground mine positioning and emergency response based on CNGI and WSN", which is carried out for each miner through a wireless sensor network Real-time positioning is expected to achieve linkage with various disaster warning systems. On March 15th, China University of Mining and Technology signed an agreement with the Xuzhou Municipal Government of Jiangsu Province to jointly build the "Perception Mine" Engineering Research Center, gathering the scientific research strength of the school, researching and developing the Internet of Things industry, with a view to applying the Internet of Things technology to coal mines in. Let's take a look at the situation of foreign coal mines. I feel that the British zero-mortality gas detection alarm system is also available in our country, but it is very expensive and will not be equipped by everyone. Generally, it is brought by gas inspectors and goes to inspect regularly. , There is a problem to notify the evacuation through the dispatch phone. Zhao Duan, a doctoral student at China University of Mining and Technology, said that the United States, as the world ’s second largest coal mining country, had 29 deaths from coal mine accidents in 2008, while countries such as the United Kingdom and Australia even achieved zero death rates for coal mining for many years. In the United States, most of the dangerous extraction work does not require workers to climb down the well, but instead uses machines instead. German mining workers carry a "gas detection alarm" when working underground, and once the gas concentration is too high, they will automatically alarm. Aside from the monitoring system, other complete sets of equipment for coal mine underground equipment, in addition to gas detection alarms, there are many information equipment that can be used, such as digital sensors. We know that the underground working environment needs to monitor a lot of environmental data, such as gas concentration, belt speed, rotation speed, ventilation volume, liquid level, etc. Take the belt alone, it involves speed, deviation, emergency stop device, temperature, CO concentration, etc. The use of analog sensors can only be transmitted in one way, while the use of digital sensors can transmit multiple signals at the same time, and the transmission speed is not the same day. And language. Another example is wireless sensors. Wired sensors can be easily destroyed in complex underground environments. For example, a piece of coal may smash the sensor on the belt. Wireless sensors can largely avoid the problem of sensor failure and improve the accuracy of monitoring. Of course, some of the informatization we are looking forward to can't be done now. For example, each worker carries an electronic tag to achieve precise positioning. Although many manufacturers are so sloppy, in fact the current technology and products can only achieve a very rough positioning, which is equivalent to punching in a general company and can only achieve management functions. At present, the use of Internet of Things to achieve precise positioning must first overcome the problem of underground wireless signal attenuation. Using wireless sensor networks and positioning algorithms to achieve precise positioning of personnel is also the research direction of some manufacturers and scientific research institutions. As an important means to support business and management, informatization has achieved an astonishing degree in many industries in improving business response speed and management level. We have reason to believe that informatization helps us protect the lives of miners is not an illusion.
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