CN111766348A - Online calibration method and device for coal mine underground gas sensor - Google Patents
Online calibration method and device for coal mine underground gas sensor Download PDFInfo
- Publication number
- CN111766348A CN111766348A CN202010739724.3A CN202010739724A CN111766348A CN 111766348 A CN111766348 A CN 111766348A CN 202010739724 A CN202010739724 A CN 202010739724A CN 111766348 A CN111766348 A CN 111766348A
- Authority
- CN
- China
- Prior art keywords
- gas
- gas sensor
- air
- standard
- ventilation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
- G01N33/0072—Arrangements to check the analyser by generating a test gas
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an online calibration method and device for a coal mine underground gas sensor, belonging to the technical field of gas concentration sensing and comprising the following steps: providing standard gas for calibrating the gas sensor, a ventilation device connected with a gas nozzle of the gas sensor and a gas pipe for conveying the standard gas to the ventilation device; setting the gas sensor in a precision calibration state, and connecting the ventilation device with standard gas through a gas pipe; opening standard gas to replace the air in the air exchanging pipe and the air breather; butting the ventilation device with an air tap of the gas sensor to ensure that the display numerical value of the gas sensor is stable and reaches the standard gas concentration; and taking away the ventilation device, closing the standard gas, and then taking the gas sensor out of the precision calibration state. The device comprises a ventilation device, an air pipe, a telescopic rod, a rotor flowmeter, a flow pressure regulating valve and standard air. The invention can solve the difficult problems of time and labor waste in the process of adjusting the periodic precision of the gas sensor in actual use in a coal mine.
Description
Technical Field
The invention belongs to the technical field of gas concentration sensing and adjustment, and particularly relates to an online calibration method and device for a gas sensor in a coal mine.
Background
According to relevant regulations in coal mine safety regulations, the installation and setting requirements of various sensors in a coal mine well, the sensors are required to be arranged in a plurality of underground areas, and the maintenance workload is large. Except that the mining carbon dioxide sensor is not installed at the roof position, other various gases basically need to be hung at the roof position. Taking a methane sensor as an example, the methane (gas) sensor should be vertically suspended, not more than 300mm from a top plate (top beam), not less than 200mm from the roadway wall, and convenient to install and maintain without affecting pedestrians and traveling cranes. 1. And a methane sensor is arranged at a position of 10-15 m on the air supply side of the electrical equipment temporarily constructed in the mining area return air lane, the one-wing return air lane and the main return air lane. 2. The mining explosion-proof special storage battery electric locomotive is provided with a vehicle-mounted methane power-off instrument or a portable methane detection alarm instrument; the mining explosion-proof diesel locomotive must be provided with a portable methane detection alarm instrument. 3. A methane sensor must be arranged in a shaft which is also used as a return air shaft and is provided with a belt conveyor. 4. And a methane sensor is arranged at a position of 10-15 m on the air supply side of the electrical equipment temporarily constructed in the mining area return air lane, the one-wing return air lane and the main return air lane. 5. Methane sensors are arranged above the underground coal bunker and the coal bunker of the ground coal preparation plant. 6. A methane sensor is arranged above the closed ground coal preparation plant machine room. 7. A methane sensor is preferably located above the closed belt conveyor above the ground corridor. 8. A methane sensor is required to be arranged indoors in the ground gas drainage pump station. 9. A methane sensor must be arranged outside the grid at the downwind side of the underground temporary gas drainage pump station. 10. A methane sensor is arranged in an input pipeline of the pumping pump. When gas is used, a methane sensor is arranged in the output pipeline; when gas is not used and dry type gas pumping and discharging equipment is adopted, a methane sensor is also arranged in the output pipeline.
At present, the zero point and the test precision of the sensor need to be adjusted regularly. Taking various methane sensors as an example, a catalytic combustion type principle is adopted, and a calibration period 15d is specified according to an AQ6202-2006 carrier catalytic element for coal mine methane detection; the thermal conductivity principle detector AQ 6204-; an infrared spectrum absorption type sensor 'AQ 6211-2008 non-dispersive infrared methane sensor' for a coal mine stipulates a calibration period of 60 d; the standard gas regulation calibration of the conventional gas sensor mostly adopts several methods of regular well lifting (taking down from the underground of a coal mine to the ground and then bringing the well to the ground), calibration by standard gas on the ground, calibration by standard gas in underground concentration or in-situ online calibration. The gas sensor online calibration device for the underground coal mine is high in installation position of the underground gas sensor, inconvenient in-situ online calibration is carried out under the condition of not using a support or a man ladder, threaded connection, buckling connection and elastic rubber plug buckling are adopted for most of the ventilation seat and the gas chamber of the sensor, high-altitude operation is not easy to realize, the actual field calibration work difficulty is high, the gas sensor online calibration is a future development trend in order to adapt to convenient and efficient standard gas calibration of mass underground gas sensors in the future, and the device for the online calibration of the underground coal mine gas sensor has great significance.
Disclosure of Invention
In view of the above, the invention aims to provide an online calibration method for a coal mine underground gas sensor, which solves the problem that the coal mine actually uses the gas sensor, and the time and labor are wasted in the regular precision calibration process.
The invention is realized by the following technical scheme:
the invention provides an online calibration method for a coal mine underground gas sensor, which comprises the following steps: providing standard gas for calibrating the gas sensor, a ventilation device connected with a gas nozzle of the gas sensor and a gas pipe for conveying the standard gas to the ventilation device; setting the gas sensor in a precision calibration state, and connecting the ventilation device with standard gas through a gas pipe; opening standard gas to replace the air in the air exchanging pipe and the air breather; butting the ventilation device with an air tap of the gas sensor to ensure that the display numerical value of the gas sensor is stable and reaches the standard gas concentration; and taking away the ventilation device, closing the standard gas, and then taking the gas sensor out of the precision calibration state.
Preferably, the setting or exiting of the precision calibration state of the gas sensor is controlled by a remote controller or communication.
Preferably, the flow rate of the standard gas is adjusted by a flow rate adjusting valve provided in the gas pipe, and the flow rate of the standard gas is observed by a rotameter.
Preferably, after the standard gas is started, the air in the air exchange pipe and the air breather is juxtaposed for 2-3min when the standard gas flow reaches a set value.
Preferably, the air vent is delivered to the air tap of the air sensor by means of a telescopic rod.
Preferably, the magnetic attraction of the ventilating device is utilized to be quickly and hermetically connected with the air tap of the gas sensor.
The invention also provides an online calibration device for the coal mine underground gas sensor, which is used for realizing the online calibration method for the gas sensor and comprises the following steps: the device comprises a ventilating device, an air pipe, a telescopic rod, a rotor flowmeter, a flow pressure regulating valve and standard air, wherein the ventilating device is quickly and hermetically connected with an air tap of a gas sensor and is connected with the standard air through the air pipe; the telescopic rod sends the ventilation device to an air tap of the gas sensor, and the air pipe is arranged in the air tap in a penetrating way; the air pipe is provided with a rotor flowmeter and a flow pressure regulating valve.
Furthermore, the ventilation device consists of a ventilation cover, magnetic steel, a guide cylinder and a ventilation air passage, wherein the guide cylinder which is butted with the air tap of the gas sensor, the magnetic steel which is magnetically connected with the air tap and the ventilation air passage which is connected with the air pipe are arranged in the ventilation cover, the guide cylinder is matched with the circumference of the air tap, and a guide inclined plane is arranged in the guide cylinder and communicated with the ventilation air passage.
Furthermore, the ventilation cover is embedded with the magnetic steel at the bottom close to the guide cylinder, and the magnetic steel is permanent magnetic steel.
Furthermore, the magnetic steel and the ventilation cover are molded together by injection, and the ventilation cover is made of engineering plastics or plastic materials. .
The invention has the beneficial effects that: according to the invention, the top end of the ventilation cover is closely matched with the air nozzle magnet, so that the butt joint within 0.5s is realized, the quick butt joint ventilation of the gas sensor is further realized, and the ventilation efficiency is effectively improved; by embedded magnet steel and the integrative injection moulding of cover of ventilating, the shaping is efficient, easily realizes automatic batch manufacturing, and with low costs, the reliability is high.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an online calibration device of the present invention.
Fig. 2 is a sectional view showing the internal structure of the gas sensor of the present invention.
Reference numerals: the device comprises an air tap 1, a ventilation device 2, an air pipe 3, a telescopic rod 4, a handle 5, a rotor flowmeter 6, a flow pressure regulating valve 7, standard air 8, a gas sensor 9, a roadway roof 10, a keel 11, a detection cavity 12, a gas sensitive element 13, a dust filter 14, a hole check ring 15, a signal processing assembly 16 and a connector 17; 2-1 parts of ventilation hood, 2-2 parts of magnetic steel, 2-3 parts of guide cylinder and 2-4 parts of ventilation air passage.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in figure 1, the invention discloses an online calibration device for a coal mine underground gas sensor, which comprises an air tap 1 of a gas sensor 9, a ventilation device 2, an expansion link 4, a rotor flow meter 6, a flow pressure regulating valve 7 and standard gas 8. The ventilation device is arranged at the top end of the telescopic rod 4 through a flexible air pipe 3; the air breather 2 and the air tap 1 of the gas sensor 9 are tightly matched with the air tap of the body sensor by the guide cylinder 2-3 at the top end of the air breather cover 2-1 under the action of the magnetic steel 2-2 arranged in the air breather and the air tap 1, so that quick butt joint and ventilation are realized; the telescopic rod 4 is multi-section telescopic and can be freely stretched and retracted; the telescopic rod 4 is of a middle hole structure, the flexible air pipe 3 penetrates through the bottom end of the middle hole to be connected with the air outlet end of the rotor flow meter 6, and the air inlet end of the rotor flow meter 6 is connected with the standard air 8 through the flow pressure regulating valve 7. By adopting the scheme, the online calibration device can realize in-situ, efficient, convenient and online calibration of the gas sensor, and the technical achievement can be applied to online calibration of various sensors such as underground methane, carbon monoxide, oxygen, hydrogen and the like. The technical design of the invention has the following advantages: the in-situ online calibration is realized without disassembling the sensor; the top end of the ventilation cover is closely matched with the air nozzle magnet, so that the butt joint ventilation in 0.5s is realized, and the ventilation efficiency is effectively improved.
Taking the gas sensor 9 installed on the roadway roof 10 as an example, the following specific flow is described:
1) the gas sensor is in a precision calibration state by methods such as remote controller or communication control;
2) the magnetic suction type ventilation device, the telescopic rod, the rotor flowmeter, the flow pressure regulating valve and the standard gas are connected in sequence through the gas pipe;
3) adjusting a flow pressure regulating valve, observing the rotameter to enable the flow of the standard gas to meet the specification requirement, waiting for 2-3min, and replacing the non-standard gas in the gas pipe and the parts connected with the gas pipe by the standard gas;
4) a handle 5 of the telescopic rod is held by hand, the air tap of the gas sensor is ensured to be in butt joint with the magnetic suction type ventilation device, and after the numerical value of the gas sensor is stable, the display value is adjusted to be consistent with the standard gas concentration according to the specification requirements of various sensors;
5) and after calibration is finished, the gas sensor precision calibration state is quitted.
The ventilating device 2 in this embodiment is a magnetic attraction structure, and is composed of a ventilating cover 2-1 and magnetic steel 2-2, the ventilating cover is made of engineering plastics or plastic materials, a guide cylinder 2-3 arranged on the ventilating cover is circumferentially matched with an air tap 1 of the gas sensor 9, permanent magnetic steel is embedded in the lower part of the guide cylinder, the ventilating cover and the magnetic steel are integrally formed by injection molding, and a ventilating air passage 2-4 arranged in the ventilating cover is communicated with the guide cylinder and can be connected with the air tap of the gas sensor through the guide cylinder, so that the ventilating air passage is communicated with the air tap. Meanwhile, as shown in fig. 2, the gas sensor 5 is further provided with a keel 11, a detection cavity 12, a gas sensitive element 13, a dust filter 14, a hole check ring 15, a signal processing assembly 16 and a connector 17, the gas nozzle 6 is made of a magnetically attractable material, preferably a martensite and ferrite magnetically attractable stainless material, and a ventilation inner hole is processed in the gas nozzle; the air nozzle and the dust filter are integrated through injection molding of a keel, the keel is preferably made of flame-retardant and antistatic treatment engineering plastic materials (ABS or PC, carbon powder or aluminum powder antistatic agent is matched), the dust filter is made of a stainless steel woven filter screen, and the dust filtering granularity is not more than phi 0.05 mm; the air tap is matched and assembled in a matched mounting hole of the shell of the gas sensor through a retainer ring for the hole; the magnetic suction type gas sensor is internally provided with a signal processing assembly of a gas sensing element, and outputs digital communication signals through a connector to be connected with other matched equipment, and the digital communication signals are preferably communicated in a TTL level or RS485 mode. When the ventilating device is in butt joint with the gas sensor, the magnetic steel in the ventilating device is rapidly matched with the end face of the gas nozzle; in the ventilation process, standard gas with standard flow (usually 300ml/min) enters the detection cavity through the ventilation air passage and the inner hole of the air tap of the gas sensor and is fully contacted with the gas sensitive element for detection; the gas in the gas sensor is discharged out of the detection cavity through the dust filter under the condition of standard gas ventilation positive pressure; the detection signal passes through the signal processing assembly and then is output as a digital communication signal by the connector, and is connected with other matched equipment for communication, so that the gas rapid detection is realized. Like this, gas sensor carries out standard gas calibration in-process, will ventilate the gas cock that the cover top is close to gas sensor, ventilates cover top and gas cock closely cooperate with gas sensor under the magnet steel effect, realizes quick butt joint and ventilates.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An online calibration method for a coal mine underground gas sensor is characterized by comprising the following steps:
providing standard gas (8) for calibrating a gas sensor (9), a ventilation device (2) connected with a gas nozzle (1) of the gas sensor, and a gas pipe (3) for conveying the standard gas to the ventilation device;
setting the gas sensor in a precision calibration state, and connecting the ventilation device with standard gas through a gas pipe;
opening standard gas to replace the air in the air exchanging pipe and the air breather;
butting the ventilation device with an air tap of the gas sensor to ensure that the display numerical value of the gas sensor is stable and reaches the standard gas concentration;
and taking away the ventilation device, closing the standard gas, and then taking the gas sensor out of the precision calibration state.
2. The online calibration method for the gas sensor under the coal mine according to claim 1, characterized in that the setting or exiting of the precision calibration state of the gas sensor is controlled by a remote controller or communication.
3. The online calibration method for the coal mine underground gas sensor according to claim 1, characterized in that a flow pressure regulating valve arranged on a gas pipe is used for regulating the flow rate of standard gas and a rotor flowmeter is used for observing the flow of the standard gas.
4. The on-line calibration method for the coal mine underground gas sensor according to claim 1, characterized in that after the standard gas is started, the air in the air exchange pipe and the air breather is juxtaposed for 2-3min when the standard gas flow reaches a set value.
5. The coal mine underground gas sensor online calibration method according to claim 1, characterized in that the ventilation device is sent to the gas nozzle of the gas sensor by using a telescopic rod (4).
6. The coal mine underground gas sensor online calibration method according to claim 1, characterized in that the magnetic attraction of the ventilation device is utilized to be in quick and closed connection with an air tap of the gas sensor.
7. An online calibration device for a coal mine underground gas sensor, which is used for realizing the online calibration method for the gas sensor according to any one of claims 1 to 6, and comprises the following steps: the device comprises a ventilating device (2), an air pipe (3), an expansion link (4), a rotor flow meter (6), a flow pressure regulating valve (7) and standard air (8), wherein the ventilating device is quickly and hermetically connected with an air tap (1) of a gas sensor (9) and is connected with the standard air through the air pipe; the telescopic rod sends the ventilation device to an air tap of the gas sensor, and the air pipe is arranged in the telescopic rod in a penetrating way; and the air pipe is provided with a rotor flowmeter and a flow pressure regulating valve.
8. The on-line calibration device for the coal mine underground gas sensor according to claim 7, characterized in that the ventilation device comprises a ventilation cover (2-1), magnetic steel (2-2), a guide cylinder (2-3) and a ventilation air passage (2-4), wherein the ventilation cover is internally provided with the guide cylinder butted with the air tap of the gas sensor, the magnetic steel magnetically connected with the air tap and the ventilation air passage connected with an air pipe, the guide cylinder is matched with the circumference of the air tap, and a guide inclined plane is arranged in the guide cylinder and communicated with the ventilation air passage.
9. The on-line calibration device for the coal mine underground gas sensor as recited in claim 7, wherein the magnetic steel is embedded in the bottom of the ventilation hood close to the guide cylinder, and the magnetic steel is permanent magnetic steel.
10. The on-line calibration device for the coal mine underground gas sensor according to any one of claims 7 to 9, wherein the magnetic steel and the ventilation cover are injection molded together, and the ventilation cover is made of engineering plastics or plastic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010739724.3A CN111766348A (en) | 2020-07-28 | 2020-07-28 | Online calibration method and device for coal mine underground gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010739724.3A CN111766348A (en) | 2020-07-28 | 2020-07-28 | Online calibration method and device for coal mine underground gas sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111766348A true CN111766348A (en) | 2020-10-13 |
Family
ID=72727683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010739724.3A Pending CN111766348A (en) | 2020-07-28 | 2020-07-28 | Online calibration method and device for coal mine underground gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111766348A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114167027A (en) * | 2021-11-15 | 2022-03-11 | 天地（常州）自动化股份有限公司 | Automatic adjustment device and method for mining gas sensor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201382922Y (en) * | 2009-03-13 | 2010-01-13 | 郑州创威煤安科技有限公司 | Gas determination device |
| TWM497727U (en) * | 2014-12-04 | 2015-03-21 | Manz Taiwan Ltd | Rotary joints and process equipment |
| US20160020557A1 (en) * | 2014-07-21 | 2016-01-21 | Daniel J. Daoura | Quick connect interface |
| CN207798823U (en) * | 2018-02-09 | 2018-08-31 | 王慧芳 | Methane transducer calibration apparatus ventilation nozzle |
| CN207937008U (en) * | 2018-03-26 | 2018-10-02 | 韩磊 | Mine safety mining detector |
| CN208506011U (en) * | 2018-07-23 | 2019-02-15 | 北京零微科技有限公司 | A kind of magnetic-type detection module |
| CN210687420U (en) * | 2019-10-24 | 2020-06-05 | 浙江澳川液压器材股份有限公司 | Magnetic attraction positioning right-angle combined joint |
-
2020
- 2020-07-28 CN CN202010739724.3A patent/CN111766348A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201382922Y (en) * | 2009-03-13 | 2010-01-13 | 郑州创威煤安科技有限公司 | Gas determination device |
| US20160020557A1 (en) * | 2014-07-21 | 2016-01-21 | Daniel J. Daoura | Quick connect interface |
| TWM497727U (en) * | 2014-12-04 | 2015-03-21 | Manz Taiwan Ltd | Rotary joints and process equipment |
| CN207798823U (en) * | 2018-02-09 | 2018-08-31 | 王慧芳 | Methane transducer calibration apparatus ventilation nozzle |
| CN207937008U (en) * | 2018-03-26 | 2018-10-02 | 韩磊 | Mine safety mining detector |
| CN208506011U (en) * | 2018-07-23 | 2019-02-15 | 北京零微科技有限公司 | A kind of magnetic-type detection module |
| CN210687420U (en) * | 2019-10-24 | 2020-06-05 | 浙江澳川液压器材股份有限公司 | Magnetic attraction positioning right-angle combined joint |
Non-Patent Citations (1)
| Title |
|---|
| 张俊卿: "一种矿用甲烷传感器井下自动标校装置", 《煤炭与化工》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114167027A (en) * | 2021-11-15 | 2022-03-11 | 天地（常州）自动化股份有限公司 | Automatic adjustment device and method for mining gas sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210322992U (en) | Intelligent sewage sampling and detecting device | |
| KR101165618B1 (en) | Monitoring system for inside of the manhole | |
| CN107012823A (en) | A kind of green construction dust pelletizing system of intelligent-induction | |
| CN210507755U (en) | Prefabricated pump station of sewage promotion | |
| CN111766348A (en) | Online calibration method and device for coal mine underground gas sensor | |
| CN204556597U (en) | A kind of gas sensor high/low temperature real-time test device | |
| CN208486357U (en) | A kind of automatic detection pernicious gas and the prefabricated pumping plant of exhaust | |
| CN209100704U (en) | A kind of automatic blowdown valve | |
| CN209468813U (en) | A kind of integrated form integration pump house | |
| CN207164016U (en) | A kind of gas leakage on-line monitoring prior-warning device buried for carbon dioxide drive | |
| CN217403722U (en) | Automatic inspection device for process area of natural gas station | |
| CN110146340A (en) | A kind of deep well underground water continuous sampling system | |
| CN209708289U (en) | People's air defense area gas monitoring system | |
| CN105804160A (en) | Intelligent integrated pump station | |
| CN205917836U (en) | Intelligent monitoring glass steel integration lifting pump station | |
| CN214847064U (en) | Intelligent module box of natural gas valve group | |
| CN108916646A (en) | A kind of dispenser | |
| CN207925925U (en) | A kind of power switch cabinet convenient for control | |
| CN209264679U (en) | A kind of multistation gas detecting instrument verification machine | |
| CN208309776U (en) | A kind of prefabricated Boosting pumping station | |
| CN207623083U (en) | A kind of environment-friendly automatic measuring device for monitoring rate pair | |
| CN111796062A (en) | Magnetic-type gas sensor ventilating device and preparation method | |
| CN208455722U (en) | A kind of fire cistern system with sweeper | |
| CN212866276U (en) | Prefabricated pump station with temperature control function | |
| CN212742857U (en) | Prefabricated pump station of integration with environmental detection function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201013 |
|
| RJ01 | Rejection of invention patent application after publication |