Summary: Summary: in our mines, coal mines and other mostly underground mining. In the mining process, disaster gas such as methane is inevitably generated, so that the entire working environment is in an explosive gas environment. It is impossible to prevent coal and rock bodies from releasing gas such as gas in underground coal mines. Only forced air can be used to dilute gas and gas to reduce the amount of gas flowing out into the working environment and to strengthen passive measures such as measurement and management of disaster gas. Key words: gas accident; mine safety; challenge 1. Particularity of mine operation environment and seriousness of mine safety accident According to statistics, all coal mines in China are gas mines, among 657 state-owned key coal mines, high gas mines and coal and gas There are 310 prominent mines, accounting for 47% of the total number of mines; 93% of state-owned coal mine dust has an explosion hazard. In 2001, there were 667 gas explosion accidents and 2,446 deaths, accounting for 5.8% and 19.5% of the accidents of industrial and mining enterprises respectively. The casualties caused by gas accidents in large and medium-sized coal mines accounted for more than 40% of the total death toll; 10 deaths per person. Most of the above major accidents are dominated by gas accidents. The world's largest gas coal dust explosion accident occurred in Benxi Coal Mine of China in 1942, when 1,549 people died and 246 people were disabled. In addition, the rock dust and coal dust generated in the mine production process will cause the miners to suffer from pneumoconiosis, namely coal lung, silicosis and coal sputum lung disease, and with the improvement of mechanization, pneumoconiosis is on the rise. According to incomplete statistics, by 1998, China's coal mine workers had a cumulative incidence of pneumoconiosis of 195,000, accounting for 46.5% of the total number of pneumoconiosis in the country, and growing at a scale of 40005,000 people per year. The above figures do not include township coal mines and local coal mines where hazards and accidents are more serious. The number of miners who die from silicosis every year is about 2,000-3,000. Second, the characteristics of mine safety measurement Because mines and other mines mining operations environment is in an explosive gas environment, effective control of its concentration outside the explosion concentration range, in order to control the occurrence of explosion accidents, therefore, monitoring and control of disaster concentrations and Taking corresponding management and technical measures at different concentrations is the main measure for disaster prevention. According to the requirements of the "Measuring Law", the "Safety Regulations for Coal Mines" provides detailed and quantitative regulations on the "safety monitoring of ventilation, gas, coal dust and ventilation" in mines, that is, the air volume of production mines should be based on coal mining, excavation and copper chambers. And the sum of the actual required air volume at other locations is measured. The actual required air volume at each location shall be such that the concentration, wind speed and temperature of gas, carbon dioxide, hydrogen and other harmful gases in the wind current at the site shall be in accordance with this regulation. Relevant regulations; when the concentration of biogas in the wind surface of the mining face exceeds 1%, the work must be stopped, the personnel must be evacuated, the power supply must be cut off, and the treatment should be carried out. When the gas concentration in the wind flow reaches 1% within 20m near the blasting site, it is strictly prohibited to blast the gas. The electrical equipment whose concentration exceeds the power supply to be cut off must be energized when the gas concentration drops below 1%; the dust concentration in the air of the underground working place is different according to the free SIO2 content in the dust, and the maximum allowable concentration is different, and the total dust concentration is the same. Do not exceed 2mg/m3 to l0m g/m3, and the concentration of respiratory dust should not exceed 0.3mg/m3 to 3.5mg/m3; use in coal mines To implement these mandatory regulations, it is necessary to monitor the concentration of methane, air supply and dust concentration in the mine and the gas stream by means of working measuring instruments that meet the requirements of the metrological verification regulations. If the measurement results of these measuring instruments are inaccurate, the corresponding management and technical measures can not keep up, and it is prone to serious accidents, and it is difficult to ensure the safety and health of safe production and underground workers. The purpose of mine safety measurement is to ensure the accuracy, effectiveness and uniformity of measuring instruments such as methane concentration, air supply volume and dust concentration. Therefore, the distinguishing feature of mine safety measurement is that it is closely related to safety. Only by strengthening mine safety measurement work can we play a basic guarantee role for mine safety production and miners' life and health. Third, the status quo and problems of mine safety measurement work Due to the particularity of the mine operating environment and the characteristics of mine safety measurement, the country has always attached more importance. In July 1992, the former State Bureau of Technical Supervision approved the establishment of the National Mine Safety Metering Station (hereinafter referred to as the mine station) by the “Technical Supervision Bureau†issued “1992†No. 337. In this way, the mine station became authorized to undertake mines across the country. The national legal metrological verification institution for the verification and testing of mine measuring instruments with safe operation. Since the establishment of the mine station, under the leadership of the competent department of the industry, the highest measurement standards for the three major categories of methane, dust and wind speed saved by the mine station have been applied. Work carried out, and successively established one mine safety measurement substation, 25 local stations, more than 20 enterprise maximum measurement standards, and 89 national coal mine safety supervision work measurement standards, and conducted periodic verification of measurement standards, and hosted 17 The training of mine safety metrology inspectors of more than 1,000 people, organized and participated in the formulation of 12 national or industry metrological verification procedures, and initially established the quantitative value transmission system and supervision and management system covering the main coal producing areas and corresponding production enterprises in China. Mine safety production and monitoring provide measurement technology support. Up to now, through the past ten years Efforts, although the establishment of the mine safety measurement supervision and management system and the value transmission and traceability system, but there are still many problems, mainly reflected in: (1) mine safety measurement supervision is weakened, the mandatory verification rate of measuring instruments is very low. Mines and other mines have a wide distribution area, a large number of vehicles, inconvenient transportation, low management level, low quality of personnel, indifferent legal measurement concepts, and low enthusiasm for safe measuring instruments. In this case, with the country The institutional reform, the former Ministry of Coal and the former National Coal Industry Bureau were successively revoked. At present, there is no clear business department for mine safety measurement, which makes it difficult to measure the administrative supervision and management and the mine safety measurement system. The mandatory verification rate of mine safety measurement instruments is very high. Low, far below the 95% requirement set by the state, the accuracy of the value of safety measuring instruments such as methane analyzers used in coal mines and other mine production cannot be guaranteed, and there are hidden dangers of accidents, which seriously affect the safe production of mines. 2) There is a lack of professional and technical review for some verification institutions and measurement standards. The personnel with poor professional quality and the verification agencies that are not in place are engaged in the verification work, and it is difficult to provide accurate and reliable measurement data for mine safety. The Measures for the Supervision and Administration of Legal Measurement and Verification Organizations and the Measures for the Administration of Professional Measurement Stations formulated by the State Administration of Quality Supervision. There are strict regulations on professional stations and professional standards assessment. In fact, some local professional measurement stations and professional measurement standards have neglected professional assessments, and even directly established measurement stations without professional technical assessment, which has affected the measurement supervision and management of the industry. The measurement and verification institutions have not carried out professional assessments, the mine safety measurement expertise is not enough, the verification procedures are misunderstood, and some even use the expired verification procedures, the verification items are incomplete, and the verification results are seriously inconsistent with the actual situation. For the unqualified measuring instruments, the certificate of conformity is still issued, which leaves serious hidden dangers for mine safety. For example, if a metrological verification institution in Southwest China has not been professionally assessed, the local technical supervision department directly evaluates the authorization. The recent inspection found that the institution's measurement standard equipment is incomplete, the rules and regulations are not implemented strictly, and the verification personnel are not skilled in operation. 4. Suggestions for mine safety measurement work (1) Strengthen mine safety measurement supervision and improve the mandatory verification rate of safety measurement instruments. The State Administration of Work Safety is an administrative body that comprehensively manages national safety production work, performs national safety production supervision and management, and coal mine safety supervision functions. The establishment of the State Administration of Work Safety is to meet the needs of China's socialist market economic system and safe production work, and further strengthen the state's supervision and management of safety production and coal mine safety supervision to prevent and reduce various types of casualties. In recent times, in order to ensure the accuracy and effectiveness of mine safety measuring instruments, and have legal effect, improve the mine safety supervision and supervision technical support system, it is recommended that the State Administration of Work Safety (National Coal Mine Safety Supervision Bureau) The human safety production technology guarantee system, and strengthen the business guidance for mine safety measurement, and play its technical support role. With the State Administration of Work Safety further increasing the monitoring of calibration and calibration of measuring instruments, the monitoring of measuring instruments is included in the daily safety supervision work, and the mandatory verification rate of safety measuring instruments such as methane detectors will be greatly improved. (2) Strengthen the construction of mine safety measurement system, improve the professional quality of personnel, and ensure the quality of mine safety measurement. In view of the particularity of the mining operation environment and the characteristics of mine safety measurement, the current situation of the management of the verification organization is chaotic, and the professional quality of the personnel is poor. In order to ensure the accurate and uniform value of the mine safety measurement instruments, the mine operation safety is ensured, and the mine workers are guaranteed. Safety and health, the General Administration of Quality Supervision, Inspection and Quarantine and the State Administration of Work Safety (National Coal Mine Safety Supervision Bureau) are required to draft and publish mine safety measurement management specifications. Clarify the role and status of the competent departments of mine safety measurement industry in mine safety measurement work, further standardize the work quality of mine safety measurement, and improve the mine safety measurement system. (3) Further increase investment in technology and economy, timely develop new measurement standards, formulate and revise metrological verification procedures, and provide technical basis for mine safety measurement. PVC Fast Roll Up Door, AGV high speed roll up door, AGV high speed rolling door, roll fast doors SHENZHEN HONGFA AUTOMATIC DOOR CO., LTD , https://www.hongfafrud.com