*JT safety technology development and contribution coal mine safety instrument measurement and control communication technology research and contribution measurement and control technology company (Coal Science Research Institute Fushun Branch, Liaoning Fushun 113001) obtained scientific research, technical achievements, and has been promoted in the national coal industry and Application, received a good result.
1 Overview Fushun Branch started from the gas analysis room in 1953, and carried out a large number of gas detection sensors and monitoring instruments, mine ventilation detection instruments, mine fire monitoring sensors and monitoring devices, coal mine environmental monitoring systems, mine disaster communication and other aspects. the study. From constant gas analysis to trace gas analysis, the instrument and verification tube were developed, and the gas analysis technology was further developed into field application, fire prediction and continuous monitoring, which guided the prevention and control of various harmful gases in the mine.
In addition to the quality standard procedures issued by the Ministry, the standard sampling method for coal mine gas was also established and a standard gas distribution station was established. In 1985, the project of the automatic fire prevention system for coal mine belt conveyors was completed, and the development project of automatic fire extinguishing and dry powder series fire extinguishing bombs for diverticulum fire monitoring was determined. In the gas calibration instrument, the research focused on the development of wind power gas blocking devices. A small gas detector has been developed, and an ion breeze meter with a radioactive isotope é•…241 as a radiation source (which can measure a micro-wind speed of 0.2 m/s or less). In 1985, according to the contract of the State Planning Commission, the wind power gas lockout (also known as the local fan gas bioelectricity lock) device was used to avoid biogas and coal dust explosion accidents caused by electrical sparks. In 1987, the wind power gas lock special device was completed according to the specifications. In 1977, the AY-1 oxygen detector was completed, which filled the gap between the direct and continuous oxygen measuring instruments on the ground and underground in China. In 1982, a DCOY type carbon monoxide analyzer was developed using the principle of constant potential three-electrode electrochemistry. The instrument provides a new type of electrochemical carbon monoxide measuring element and formula, which lays a foundation for the development of digital and electronic continuous monitoring sensors for portable CO measuring instruments in China.
Methane (concentration determination) sensitive components have been developed into low-power type, telemetry type, anti-hydrogen sulfide poisoning type and other JD series products and LX-3, KD type products, mainly carrier-catalyzed oxidation type methane sensitive components. The carrier thermal conductivity components are JD-R and LX-R series products. The wire thermal conductivity components have been used in thermal conductivity high concentration and low concentration methane oxime analyzers. The semiconductor gas varistor sensitive components provide primary components for methane alarms. . Solid heat conduction elements have been successfully applied to the determination of methane and other combustible gases. The series products are CH4, C4H1 (), H2, CO and so on. The carbon monoxide (concentration measurement) sensitive component was measured by the selenium test paper method in the early stage. After the "sixth five-year", "seven-five" and "eight-five" national research, the COY1 type electrode electrochemical CO sensor was successfully developed. Electrochemical oxidation sensitive components have been successfully applied to oxygen analyzers and oxygen sensors, and have been produced in batches. Electrochemical carbon dioxide and ethylene sensitive components have been applied in natural fire monitoring after the “Eighth Five-Year†national scientific and technological research.
The research on coal mine gas sensor has been successfully developed on the “sixth five-year†and “seventh five-year†wind power methane blocking devices, and KG307 (range: 0~40% CFU) has been developed. KG3021 (range: 0~500P), KGA2 (Range: 0~300P) Electrochemical carbon monoxide sensor and KG3002 chemical carbon dioxide sensor have been applied to natural fire monitoring. KGQ2 type (025%z) electrochemical oxygen sensor, KGQ1 type (range 10-6) electrochemical ethylene sensor, used for natural fire monitoring.
KRD-1 type thermal conductivity concentration methane analyzer and LRD-2 type were developed in coal mine gas analyzer. In the 1970s, the methane alarm device for the principle of semiconductor gas-sensing resistor was developed. In the 1980s, the W821 high-low concentration methane detector (high-concentration part carrier thermal conductivity element) and JJ-1 pocket methane detection were developed using 'carrier catalytic elements. Alarm, KSW-8 type lamp gas alarm, FJ-1 type methane detector, JCB-55 type methane detection alarm, DCOY series carbon monoxide detector, AY-1 oxygen analyzer, developed into pocket type in the 1990s Electrochemical MYJ type CO detector.
The system was developed and the gas drainage monitoring system in the goaf was completed. It adopts 0~100% CH4 range methane sensor, 0~10kPa pressure range differential pressure sensor and 0100xi (T6CO measurement range electrochemical carbon monoxide sensor) and three kinds of sensors and controls the gas pipeline by starting the solenoid valve.
Developed WCP85 type gas multi-parameter monitoring system, the methane concentration measurement range is: 0~100%, the flow measurement range is 0100mVmin, the temperature measurement range is 0~100t:; the electric valve is used to continuously control the pumping quantity. The coal mine gas explosive tester was developed BP8-1 type. In the 1990s, the BMK-1 type tester was successfully developed. The explosion hazard was judged by measuring the concentration of methane, oxygen and carbon dioxide, and an alarm signal was issued when there was a danger of explosion.
Developed a natural fire detection system for coal mines with infrared fire source detectors. Minimum identification temperature. 51: Mine fire early warning beam tube continuous monitoring system, ASZ-n mine fire forecast monitoring system. The system is equipped with a ground analysis station: carbon monoxide measurement range is 01xiO-6, 0~5 0~15%; 2 is 1%2%, and the analysis results are processed by computer, showing the tendency of spontaneous combustion. The “Eighth Five-Year Plan†completed the six-parameter real-time forecasting system of the goaf, the system monitors the CHOXCOCy and the temperature (KJF coal mine safety monitoring system), and the data is completed by the microcomputer ground processing system.
Due to the research of fire monitoring system, the DFH mine belt conveyor automatic fire prevention system and DMH type coal mine belt conveyor automatic fire extinguishing system were successfully developed by the "Sixth Five-Year Plan", "Seventh Five-Year Plan" and "Eighth Five-Year Plan". Received the second prize of provincial scientific and technological progress, the title of national new product... 38 In the 1990s, the MZS-1 coal mine automatic sprinkler system was successfully developed. The fusible alloy fixed temperature fire detector is used for fire monitoring, and when there is fire, an alarm is issued and automatic sprinkler is performed.
/VV five "and" nine five" during the research, development and production of ASZ-n mine fire beam monitoring system, KJF fire monitoring system, KJS5000 belt fire monitoring system, BZJC gas pump station monitoring system and FDZB- 1A type wind power gas lock system, as well as a variety of mining sensors, etc. At present, a KJF2000 coal mine safety monitoring system that integrates the above systems in line with the actual needs of China's coal mine safety production has been developed.
In order to meet the needs of mine rescue operations, the KJT95 mine disaster relief communication system was successfully developed in the “Ninth Five-Year Plan†period. The key achievements and achievements are now briefly described below.
2 Key scientific research results 2.1 Research on methane detection components The Fushun Branch began to develop methane components, ie thermal catalytic components, from the mid-1960s. It matured in the mid-1980s and was at the leading level in China at that time.
Methane detection components are used underground in coal mines. Generally, the following problems exist: First, the service life varies, some components can reach i2 years, and some can only be used for half a year; the second activity decreases too fast, and the stability is poor. Sensitivity is calibrated in one week, and it brings a lot of work when it is used in the market. Third, when the component is working in low concentration methane (concentration <1% CFU), if it encounters high concentration of methane (concentration > At 10% CH4), the component will be activated, at which point its sensitivity will increase and it will not recover easily in a short period of time, thus causing a bias error in the test results.
We conduct in-depth research on the above problems of domestic components, improve and improve the characteristics of components, so that domestic components approach or meet the technical level of foreign components.
2.2WCP8501 gas pipeline combined sensor WCP8501 gas pipeline combined sensor centrally detects the concentration, temperature and pressure of gas, and its structure is divided into upper circuit.
The central sensor package and the lower sampler.
Sampler. The humidity inside the gas pipeline is very large, it is easy to accumulate water, and the dust is also very large and it is easy to deposit on the gas pipeline protrusion. Therefore, the sampler must be able to prevent deposits from clogging the sampler after a long period of work.
The sampler is inserted into the gas pipe and has an air inlet hole in the direction of the airflow, and an air outlet hole is opened in the direction of the airflow, and a baffle plate is fixed in the middle of the sampler to cause a pressure difference between the air inlet hole and the air outlet hole. , the airflow in the sampler has a part of the airflow flowing upwards through the sensitive component package assembly. Generally, when the gas drainage pipe is designed, the drainage flow rate is designed within a certain range, so the internal resistance of the adjustment sampler is also within a certain range. Considering the need of calibrating the sensor and cleaning the sampler, an external hole is provided on the sampler. When the calibration and cleaning are required, the external hole is opened, standard gas or air is connected, and the negative pressure air intake pumped in the gas pipe is used. The role of calibration and cleaning. The entire sampler is finally finished with a precision treatment to meet the rust prevention requirements.
Sensitive component package assembly. All the sensitive components of the WCP8501 gas pipe combination sensor are packaged in the middle part of the sensor package. The lower part of the sensor package is connected to the gas in the gas pipeline, and the upper part is led to the circuit of the sensor. The upper and lower parts are blocked by the sealing material, and the gas take-off part is blocked by powder metallurgy. The whole structure has explosion-proof performance and prevents the gas in the gas pipe from leaking outward.
Sensor selection of sensitive components. The gas concentration detecting sensitive component adopts the LX-R1 type carrier thermal conductive component produced by the Fushun Branch of the Coal Science General Administration. Its performance: bridge voltage 3.5V, bridge current 170mA, minimum sensitivity (<30%) lmV / l% CH4, linearity using carrier thermal conductivity components to detect gas concentration, this method has been used for many years, reliable. However, in the humid environment of the gas pipeline, the detection of ~100% CH4 wide range range, the appropriate working mode and the best processing circuit must be selected. The gas concentration measuring bridge is powered by a constant current mode, and its supply current is 175 mA, which is about 30X: about the surface temperature of the gas concentration detecting element is higher than the originally recommended working current. Thus, the gas concentration detecting element can more effectively exclude the influence of the humidity in the gas pipe on the detection result.
The linear range of the LX-R1 type carrier thermal conductivity element is very narrow, only 0~30% CH4 is linear, and 30%~100% (the gas concentration measurement curve in the range is nonlinear. When more than 30% CH4, the carrier heat The sensitivity of the guiding element will decrease, and the higher the gas concentration, the more the sensitivity will decrease. For this reason, we use the polygonal line nonlinear transformation circuit for linear correction. According to the actual measurement curve, we can select two calibration points to meet the measurement. Error requirement: The first calibration point is selected at 33% CH4 concentration, and the second calibration point is selected at 66% CFU concentration. After two-stage nonlinear correction, the gas concentration measurement is guaranteed to exceed the allowable range within the entire measurement range. .
The temperature measurement sensor in the WCP8501 gas pipeline combination sensor is an AD590 series integrated temperature sensor manufactured by Analog Devices, Inc.
The pressure sensitive components of the WCP8501 gas pipeline combination sensor are selected from the pressure sensitive components of ICsensors.
The WCP8501 gas pipeline combination sensor adopts the TO-8 package structure 13A absolute pressure sensitive component introduced by ICsensors, which has temperature compensation function and is equipped with a gain setting resistor.
The three sensitive components of the WCP8501 gas pipeline combination sensor are packaged in one component. The whole sensor is small in size, only need to open a sampling port on the gas pipeline, which reduces the installation work on site, and the maintenance is simple, avoiding the previous gas pipeline measurement. The sensor arrangement is scattered and is not easy to manage.
2.3 High-precision micro-pressure sensor With the uniform pressure ventilation and fire-fighting technology, and the uniform pressure sealing technology of goaf in the safe production of coal mine, the resolution and accuracy of high-precision micro-pressure sensor play a key role. The development of GY-1 high-precision micro pressure sensor provides a new monitoring method for coal mine safety production.
Relative Humidity: <98 The key sensitive component of the GY-1 high-precision micro-pressure sensor is the SMI55 series piezoresistive sensor manufactured by Silicon Microstructures Inc.
Piezoresistive sensors use integrated circuit fabrication techniques to directly generate diffusion resistors on semiconductor substrates and form bridges. Since semiconductor materials are silicon materials, piezoresistive sensors are often referred to as diffused silicon pressure sensors.
Because the air pressure in the coal mine is sometimes under the influence of factors such as shooting, switching dampers, etc., sudden changes will occur. Therefore, the sensitive components of the pressure sensor are required to resist pressure during a certain period of time. 39 hit ability. Generally, the pressure sensitive component itself has an overload resistance of 10 times the full scale.
The selected pressure sensitive component has a full-scale of 1 kPa, its maximum overload capacity is 3 kPaD, and the GY-1 high-precision micro-pressure sensor buffer device is designed to withstand overload of 10 times the full-scale pressure in 5 s. In order to ensure that the device can work under the coal mine for a long time, a filter is installed at the air inlet to avoid the entry of underground dust and block the orifice.
Temperature compensation of the output signal of the pressure sensitive component: When the temperature of the pressure sensitive component increases, the following characteristics are exhibited: 1 the pressure sensitivity decreases; 2 the resistance value of each piezoresistive increases. The GY-1 high-precision micro-pressure sensor has been deeply studied in the selection of sensitive components, electronic circuit design and digital processing, ensuring that the sensor can achieve the predetermined technical specifications.
In the laboratory, the sensor was tested for zero drift test, constant pressure load test, low temperature zero test, and high temperature zero test. After industrial trials, the “Nine-Five-Year†National Key Science and Technology Research Project “Research on High-Precision Micro-Pressure Sensors†was completed. GY-1 high-precision micro-pressure sensor fills the blank of high-precision pressure measurement in mines and reaches the domestic leading level. The sensor has been proved by laboratory and industrial tests, suitable for various needs of coal mine underground. The place to monitor. The sensor's sensitive components are highly reliable and resistant to pressure and impact. It is suitable for the harsh environment of coal mines. The secondary amplifier circuit uses high-precision instrumentation amplifiers. The signal processing uses single-chip digital technology. The whole machine has the advantages of high measurement accuracy and high display resolution. The sensor has passed the inspection of the National Coal Mine Explosion-proof Safety Product Quality Supervision and Inspection Center.
2.4KJT95 mine rescue and disaster relief communication K.IT95 mine rescue and disaster relief communication system is an ideal means of communication for mine rescue teams. This system is the national "Ninth Five-Year Plan" project, which is aimed at existing communication systems. Combining the scientific research results of mine communication technology with the national "seventh five-year" and "eight-five", and drawing on advanced technology at home and abroad, it has been developed. The system has simple structure, stable performance, convenient networking and high reliability.
The system can improve the rapid response capability and coordinated combat capability of mine disaster rescue, and achieve a new level of mine rescue work. In the mine disaster response command operation, in order to quickly understand the disaster situation, timely develop and implement disaster relief plans and reduce accident losses. And the protection of personal injury and death.
The system includes KJT9501 communication host (referred to as host), KJT9502 communication auxiliary machine (referred to as auxiliary machine), KJT9503 communication mobile phone (referred to as mobile phone), KJT9504 communication line package (referred to as line package), KJT9505 wrapped line car (referred to as line car) and other equipment. The main unit is used by the underground command; the auxiliary machine and mobile phone are used by the rescuers in the disaster area. The ambulance team uses the mobile phone (via the auxiliary machine) to speak to the host, and the players can directly contact using the mobile phone. The downhole command can directly access the Inoue Headquarters through an off-the-shelf telephone line, and the Inoue Command can intervene in the disaster relief communications command when necessary. The ambulance crew carries the ready-made tangled wire package with them, and automatically releases the line while traveling during the disaster relief operation, and keeps in touch with the underground command and the Inoue Headquarters. The communication wire doubles as the ambulance's adventure rope. The line car does not go down in actual combat. Its function is to use it to wrap the unleashed wire package into a bag for normal use.
Some mine rescue teams in the provinces of Jiangsu, Anhui, and Yunnan have been equipped and used, reflecting good results.
The KJF2000 monitoring system is equipped with environmental monitoring, tape fire prediction, natural firing prediction in goaf and production monitoring. Environmental monitoring - mainly monitoring various toxic and harmful gases and working conditions of coal mines, such as methane, carbon monoxide, oxygen concentration, wind speed, air temperature, rock coal temperature, roof pressure, air pressure, smoke and dust concentration, etc.; Monitoring - monitoring various production parameters of the main production links in the well and underground, and operating parameters of the wide equipment, such as coal bunker coal level, pump status and drainage test, hoist, local fan, pressure blower, belt conveyor, coal mining Operating conditions and parameters of machines, switches, magnetic starters, power supplies, etc.
KJF2000 system consists of ground center station, multimedia remote data terminal, modem, various underground substations, underground explosion-proof and intrinsically safe multi-channel power supply, remote power breaker, various mining sensors and mining electromechanical control equipment and KJF2000 safety production. Monitoring software is completed. The simple block diagram of the whole system is shown in the underground substation and the sensor is installed in the environment with coal dust, biogas, carbon monoxide and other dangerous gases in the underground. The various safety and production parameters of the coal mine are monitored and processed in real time, and the safety production will be carried out. The parameters are transmitted to the ground central station in time. Various data are processed by the substation and the central station, and the sound, light alarm and power-off control signals can be directly issued as required. The ground center station communicates with the downhole substation via a KJFS modem (MODEM) using a dedicated communication cable. Through the KJF2000 system, the underground safety situation and production situation can be accurately and completely understood, and early prediction and prediction of disaster accidents can be realized, and can be automatically processed in time. Production dispatchers can master the operation of underground equipment and accurately direct production.
At present, KJF2000 monitoring system has formed a series of products in the ground center station host, remote data terminal, ground computer peripheral equipment configuration, underground substation, intrinsically safe power supply, mining sensor and breaker, etc., and has long-term promotion with Fushun Branch. The ability of ASZ-type mine fire beam tube monitoring system, KJF fire monitoring system, BZJC gas station monitoring system and FDZB-1A electric gas lock system. The system can be flexibly configured according to the needs of the user.
3 The industrialization of scientific and technological achievements of scientific and technological achievements, the transformation of scientific research results into commodities, and the realization of its own value, the only purpose is to make it produce good social and economic benefits. The industrialization of scientific research results must not only go through the process of industrialization of results, but also through the process of commercialization of products. As the main transformation base of scientific research achievements, the goal is to make those high-tech, high value-added national-level new products and industry key promotion products, the latest research products to the market to maximize the market, accelerate the marketization of scientific and technological achievements, industry The speed of the process must not only meet the needs of the domestic market, but also strive to hit the international market and form a first-class scale benefit.
Therefore, in the next few years, a large amount of funds will be invested, and the market development and promotion of existing products will be carried out in a planned, step-by-step, deeper manner, and the market share of products will be continuously expanded to increase the market share of products to ensure the technological advantages of the products. Become an economic and social advantage.
3.1 Industrialization of disaster gas sensitive components and sensors Since the late 1950s, Fushun Branch has been the first to develop carrier catalytic components for methane detection. In the late 1970s, electrochemical carbon monoxide components and electrochemical oxygen sensing components were developed. Ethylene sensor, carbon dioxide sensor, developed a colloidal electrolyte carbon monoxide sensor in the 1990s. The safety monitoring system was applied earlier in China's coal mines. In the 1970s, five manufacturers produced gas detection and power-off devices. In the 1980s, the introduction of foreign advanced technology began to equip the coal mine environmental monitoring system. Since the late 1980s, through the digestion of foreign technology, Absorb and summarize the characteristics of China's coal mines to develop and develop environmental safety monitoring and control systems. There are more than 20 kinds of detection and monitoring systems available, and they are widely used in various coal mines.
According to statistics, there are 649 pairs of state-owned key coal mines in China, including 129 pairs of gas outburst mines, 136 pairs of high gas mines, accounting for more than half of the total number of mines, 61% of natural fire mines, casualties caused by gas explosions and mine fire accidents and state property. Losses have always ranked first in the world. Although China has successively borrowed foreign technology to develop and develop sensors with various parameters. However, due to the low level of domestic sensor, especially the production process of gas sensitive components, the production equipment is backward, the performance of the product has not been substantially improved. At present, the key reason for the safety monitoring system is more than half, the sensor has short life and poor stability, and the system cannot operate normally. Some mines have to purchase a large number of foreign similar products for many years; secondly, the existing monitoring systems have no uniform standards, are not compatible with each other, and there is no standard for the field-level bus, which makes the system mating equipment unable to achieve open interoperability.
The Fushun Branch of the Coal Science Research Institute is the first professional research and development unit in the country to develop, develop and produce carrier catalytic components, methane sensor colloidal electrolyte carbon monoxide components, ethylene sensors, carbon dioxide sensors, ultrasonic vortex wind speed sensors and micro pressure sensors. The production scale of the above products has expanded year by year. Therefore, it was adopted on the basis of the original research and development capabilities and technology. 41. Equipment manufacturing, expansion and introduction of foreign advanced equipment production lines and other process manufacturing technologies, reaching the world's advanced level in the short term, meeting the needs of mines, petrochemicals and other industries for disaster gas monitoring, is undoubtedly a small investment innovation fund, quick results, A significant shortcut to economic and social benefits.
3.2 Industrial gas control of coal mine gas detection equipment series products is the problem solved by the world's major coal mining countries. Gas prediction and monitoring, as the main means of gas disaster prevention and control, have been greatly developed in recent years. As a professional research institute for coal mine safety, the Fushun Branch of the Coal Science General Hospital has been at the domestic leading level in research, design and production in this field. Now it has formed a series of products, including coal seam gas multi-parameter tester, portable methane verifier, high and low. Concentration A sensor, methane power off device, wind power gas lock device, etc. 'The coal seam gas multi-parameter measuring instrument is the scientific research achievement of the national "seventh five-year", "eight five", "nine-five" scientific and technological projects, which is a domestic leading level. It has won national and ministerial level awards, and is the actual experience and experiment of coal mine underground. The product of laboratory experiments combined with computer technology. The important parameters of coal seam gas can be determined quickly, accurately and directly in a simple and convenient way. The product has obtained the explosion-proof certificate and the coal mine safety instrument certificate.
The portable methane detector belongs to the portable methane detection instrument. It has the characteristics of small size, convenient carrying, intuitive detection and low cost. It is worn by the coal mine gas and management personnel or suspended on the working surface as a gas detection alarm. It is an amount. A wide range of products. This product has obtained the explosion-proof certificate, coal mine safety instrument certificate and measurement certificate in 1997.
The wind power gas lockout device is frequently developed for the gas disasters in China's coal mine face. As early as the 1980 edition of the Coal Mine Safety Regulations, the wind power lockout device has been proposed, and the 1986 edition of the Coal Mine Safety Regulations proposed the “three specialtiesâ€. Blocking facilities. The current 1992 edition clearly states that all lockout faces in gas spilling areas, high gas mines, coal (rock) and gas (carbon dioxide) outburst mines should be equipped with two lockouts (wind power lockout, gas lock). When the local ventilator stops running or the gas concentration in the roadway exceeds the limit, all the power in the local ventilator's power supply lane can be automatically cut off immediately. The local ventilator should be powered by three special (special transformer, special switch, dedicated line) (Article 134). This is the "three special two locks" facility. Therefore, in brief, the wind power gas lock device is a safety monitoring device that realizes two locks.
Fushun Branch successfully developed China's first wind power gas lockout device in 1987, and won the third prize of Science and Technology Progress Award of the Ministry of Coal in 1989. On the basis of continuously summing up the production practice for many years and the opinions and suggestions of the feedback from various coal mines and tracking the latest electronic technology level in the modern era, after several revisions, the current production was formed in 1997.
It has the advantages of small size, simple and reliable system, and is a necessary safety equipment for coal mining face.
The methane power-off instrument is a device for realizing methane detection display and over-limit alarm for coal mining face and mobile equipment, and performing breakpoint blocking and unlocking control on the controlled electrical equipment. According to the number of control devices, it is divided into single-point, two-point and three-point power-off instruments, and has become an indispensable safety monitoring device in coal mine production.
The gas detection equipment of our hospital includes: coal-bed gas multi-parameter measuring instrument portable methane detector; wind power gas blocking device; single-point, two-point and three-point methane power-off instrument; airborne methane power-off instrument; vehicle methane power-off instrument; Dedicated monitoring equipment (derived products designed according to user requirements). In the future, we must increase investment in monitoring equipment. The necessity of investment is mainly considered from the following points: This series of products B has been identified by the coal industry as a conventional device for underground safety monitoring. The Ministry of Coal has been promoted and used in an administrative subsidy. Most of the products used by early investors did not meet the new industry standards and had reached the end of life.
The space used by local coal mines in the country is extremely large. Because this series of products has low investment, convenient use, easy maintenance, and can be easily expanded into a small safety monitoring system, it is also very suitable for local coal mines.
Due to historical reasons, state-owned large and medium-sized coal mines use products from the 1970s and 1980s in gas detection, and these products have shortcomings such as difficulty in maintenance and complicated operation, and most of them have been upgraded. This series of products has been designed with full compatibility with the old system, so it is an ideal replacement product.
Industrialization of 3.3KJF2000 Monitoring System As mentioned above, the system has a variety of monitoring functions. Since 2001, it has been used in coal mines and has been well received by the site. So far, more than 100 sets have been promoted and applied in coal mine systems.
Fushun Branch has set up personnel in the measurement and control center and software center to accelerate the industrialization process of the KJF2000 monitoring system. At present, an industrialized operation mechanism has been formed.
In short, with the deepening of the transformation of research institutes, Fushun Branch has made great efforts in the industrialization of results, which has opened up a broad future for the survival and development of the branch.
Multifunctional Knife Sharpener
General specifications
Base speed: ON/OFF Non-slip feet: 4pcs
Sharpening wheels: 2
Technical specifications
Power: 60W Frequency: 50/60 Hz
Voltage: 220-240V Cord length: 1 m
Design specifications
Material body: HIPS
Surface finishing: injected color
Cord storage: Yes
Approvals
GS/CE/CB/LVD/EMC/ROHS/REACH/ERP
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