CN222596114U - An underground tunnel air monitoring system - Google Patents
An underground tunnel air monitoring system Download PDFInfo
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- CN222596114U CN222596114U CN202421530321.8U CN202421530321U CN222596114U CN 222596114 U CN222596114 U CN 222596114U CN 202421530321 U CN202421530321 U CN 202421530321U CN 222596114 U CN222596114 U CN 222596114U
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Abstract
The application relates to the technical field of underground mine roadway monitoring, in particular to an underground roadway air monitoring system which comprises an air compression system, an air monitoring system and a control system, wherein the air compression system comprises an instrument unit and a ventilation unit, air outlets of the instrument unit are all communicated with an instrument main pipe, the instrument main pipe is connected with instrument equipment, air outlets of the ventilation unit are all communicated with the ventilation main pipe, the ventilation main pipe is connected with ventilation equipment, the air supplementing system comprises an air supplementing pipe and a valve component used for controlling on-off of the air supplementing pipe, two ends of the air supplementing pipe are respectively communicated with the instrument main pipe and the ventilation main pipe, and the air monitoring system is simultaneously connected with the valve component and the ventilation equipment in a signal mode and is used for detecting air circulation conditions of an underground roadway and controlling the air supplementing system and the ventilation equipment according to detected results. The application has the effect of maintaining normal underground work when the ventilation air compressor is abnormal.
Description
Technical Field
The application relates to the technical field of underground mine roadway monitoring, in particular to an underground roadway air monitoring system.
Background
According to the standard requirements, the information of the safety production of the metal-nonmetal underground mine is constructed and perfected from four aspects of environment monitoring, personnel monitoring, video monitoring and safety management. The environment monitoring is required to meet the monitoring function of parameters such as wind pressure, wind speed and the like. The environment monitoring in the related art only has the monitoring function, and can basically meet the requirement of underground work when the equipment is normal, but the air compressor has to stop working when the air compressor is abnormal or the equipment needs to be overhauled, so that the production efficiency is low.
Disclosure of utility model
In order to maintain normal downhole operation when an abnormality occurs in a ventilation air compressor, the application provides a downhole roadway air monitoring system.
The application provides an underground roadway air monitoring system which adopts the following technical scheme:
The underground roadway air monitoring system comprises an air compression system, an air supplementing system and an air monitoring system, wherein the air compression system comprises an instrument unit and a ventilation unit, the instrument unit comprises a plurality of instrument air compressors, air outlets of the instrument air compressors are all communicated with an instrument main pipe, the instrument main pipe is connected with instrument equipment, the ventilation unit comprises a plurality of ventilation air compressors, air outlets of the ventilation air compressors are all communicated with the ventilation main pipe, the ventilation main pipe is connected with ventilation equipment, the air supplementing system comprises an air supplementing pipe and a valve assembly used for controlling on-off of the air supplementing pipe, two ends of the air supplementing pipe are respectively communicated with the instrument main pipe and the ventilation main pipe, and the air monitoring system is simultaneously connected with the valve assembly and the ventilation equipment through signals and is used for detecting air circulation conditions of underground roadways and controlling the air supplementing system and the ventilation equipment according to detected results.
Through adopting above-mentioned technical scheme, when the air compressor that takes a breath in the well goes wrong, can be through opening valve assembly, make the female pipe that takes a breath be linked together with the female pipe for the appearance to it is required to call the air compressor for the appearance to satisfy normal underground work.
Optionally, the air monitoring system comprises a controller and a pressure probe, wherein the controller is simultaneously connected with the pressure probe and the valve component in a signal manner, and the pressure probe is arranged on the ventilation main pipe.
By adopting the technical scheme, the pressure probe can be used for monitoring the pressure change of the ventilation main pipe in real time, so that the working state of the ventilation air compressor is reflected in time, and accurate data support is provided for intelligent control of the air supplementing system.
Optionally, the ventilation equipment includes main fan, secondary fan and auxiliary fan, main fan pass through the main branch pipe with the main pipe of taking a breath links to each other, secondary fan pass through secondary branch pipe with the main pipe of taking a breath links to each other, auxiliary fan pass through auxiliary branch pipe with the main pipe of taking a breath links to each other, be equipped with first solenoid valve on the main branch pipe, be equipped with the second solenoid valve on the secondary branch pipe, be equipped with the third solenoid valve on the auxiliary branch pipe.
Through adopting above-mentioned technical scheme, realized the careful control to the ventilation equipment, can adjust the operating condition of each fan in a flexible way according to actual conditions, ensure the circulation of air in underground tunnel.
Optionally, the air monitoring system further comprises a main wind speed probe, a secondary wind speed probe and an auxiliary wind speed probe, wherein the main wind speed probe is arranged at the main fan, the secondary wind speed probe is arranged at the secondary fan, the auxiliary wind speed probe is arranged at the auxiliary fan, the main wind speed probe is in signal connection with the first electromagnetic valve, the secondary wind speed probe is in signal connection with the second electromagnetic valve, the auxiliary wind speed probe is in signal connection with the third electromagnetic valve, and the main wind speed probe, the secondary wind speed probe and the auxiliary wind speed probe are in signal connection with the controller.
By adopting the technical scheme, the wind speed at each fan can be monitored in real time by using the wind speed probe, accurate data support is provided for intelligent control of the fans, and ventilation of underground roadways is further ensured.
Optionally, the air monitoring system further comprises an alarm assembly, wherein the alarm assembly is in signal connection with the controller, and the alarm assembly comprises an emitter and an audible-visual alarm.
Through adopting above-mentioned technical scheme, the transmitter can send the signal to command center when air monitoring system detects the unusual condition, reminds the command center in time to send the maintainer to overhaul, and audible and visual alarm can in time send the police dispatch newspaper when air monitoring system detects the unusual condition, reminds on-the-spot staff to take measures, has improved the security of working in the pit.
Optionally, the air supplementing pipe is used for conveying compressed air in the main pipe for the instrument to the main pipe for ventilation, the valve assembly comprises a one-way valve and a secondary electromagnetic stop valve, the one-way valve and the secondary electromagnetic stop valve are sequentially arranged on the air supplementing pipe along the flowing direction of gas, and the secondary electromagnetic stop valve is in signal connection with the controller.
Through adopting above-mentioned technical scheme, the break-make of moisturizing pipe can be controlled to the secondary electromagnetic stop valve, can open rapidly when the air compressor is unusual to in supplementary compressed air to the main pipe of taking a breath, ensure the circulation of air in tunnel in the pit, the check valve then only allows compressed air to flow from main pipe department for the appearance to the main pipe of taking a breath, can avoid the compressed air backward flow in the main pipe of taking a breath after the secondary stop valve opens by mistake or fails, leads to the unable circulation of air in the well.
Optionally, the valve assembly further includes a primary electromagnetic stop valve, where the primary electromagnetic stop valve is disposed on the air supplementing pipe, and the primary electromagnetic stop valve is disposed on the upstream of the one-way valve along the flow direction of the gas, and the primary electromagnetic stop valve is in signal connection with the controller.
Through adopting above-mentioned technical scheme, the primary electromagnetic stop valve can replace the secondary stop valve after the failure of secondary stop valve, plays the effect of control moisturizing pipe break-make.
Optionally, a purifying component is arranged between the air outlet of the air compressor for the instrument and the main pipe for the instrument, and/or a purifying component is arranged between the air outlet of the air compressor for ventilation and the main pipe for ventilation.
Through adopting above-mentioned technical scheme, can ensure the quality of the compressed air who carries to the female pipe for appearance and take a breath female pipe, on the one hand improved the life-span of equipment for appearance, on the other hand improved underground working personnel's comfort level.
Optionally, the purification assembly comprises at least one of a water separator, a filter and a dryer.
Through adopting above-mentioned technical scheme, the purification module can get rid of substances such as moisture, impurity in the compressed air effectively, ensures the quality of the compressed air through purification module.
In summary, the present application includes at least one of the following beneficial technical effects:
1. The application adopts the air monitoring system to monitor the air circulation condition of the underground roadway in real time and intelligently controls the air supplementing system and the air exchanging equipment according to the monitoring result, so that the working states of the air supplementing system and the air exchanging equipment can be quickly adjusted when the air exchanging air compressor is abnormal, the air circulation of the underground working environment is ensured, the normal underground working is maintained, and the production efficiency is improved;
2. The application adopts the alarm component to give an alarm in time when the air monitoring system detects abnormal conditions, so as to remind workers to take measures, thereby further guaranteeing the safety of underground work.
Drawings
Fig. 1 is a schematic structural diagram of an underground roadway air monitoring system according to an embodiment of the present application.
The reference numerals indicate a 1-meter air compressor, a 2-meter main pipe, a 3-meter device, a 4-ventilation air compressor, a 5-ventilation main pipe, a 601-main fan, a 602-main branch pipe, a 603-first electromagnetic valve, a 604-main wind speed probe, a 701-secondary fan, a 702-secondary branch pipe, a 703-second electromagnetic valve, a 704-secondary wind speed probe, a 801-secondary fan, a 802-secondary branch pipe, a 803-third electromagnetic valve, a 804-secondary wind speed probe, a 9-pressure probe, a 10-ventilation pipe, a 11-primary electromagnetic stop valve, a 12-one-way valve, a 13-secondary electromagnetic stop valve and a 14-purification component.
Detailed Description
The present application will be described in further detail with reference to fig. 1.
In the normal working environment of the underground tunnel, the air compression system plays an important role in the power supply and air circulation of the underground instrument device 3, the air compression system of the underground tunnel is generally provided with instrument units and ventilation units at present, each set of units is provided with a plurality of air compressors which are commonly used and standby, when the commonly used air compressors are in a problem, the standby air compressors are started, and when the standby air compressors are in a problem, the standby air compressors can only be stopped for maintenance, and workers except maintenance workers withdraw from the underground tunnel, so that work is stopped.
In view of the above, the embodiment of the application discloses an underground roadway air monitoring system.
As shown in fig. 1, the downhole roadway air monitoring system includes an air compression system, an air make-up system, and an air monitoring system.
The air compression system comprises an instrument unit and a ventilator unit. The instrument unit comprises a plurality of instrument air compressors 1, air outlets of the instrument air compressors 1 are communicated with an instrument main pipe 2, the instrument main pipe 2 is connected with instrument equipment 3, and the instrument main pipe 2 is connected with the instrument equipment 3. Similarly, the ventilator unit also comprises a plurality of ventilation air compressors 4, wherein the air outlets of the ventilation air compressors 4 are connected to a ventilation main pipe 5, and the ventilation main pipe 5 is connected with ventilation equipment. The air supplementing system comprises an air supplementing pipe 10 and a valve component, wherein two ends of the air supplementing pipe 10 are respectively connected to the main pipe 2 for the instrument and the main pipe 5 for ventilation, and the valve component is used for controlling the on-off of the air supplementing pipe 10. The air monitoring system is connected with the valve component and the ventilation equipment through signals, and the main function of the air monitoring system is to detect the air circulation condition of the underground roadway and control the air supplementing system and the ventilation equipment according to the detection result. For example, when the air monitoring system detects that the air circulation condition of the underground roadway is problematic due to the occurrence of all of the plurality of ventilation air compressors 4 in the ventilator group, the compressed air in the main pipe 2 for instrument may be supplemented into the main ventilation pipe 5 through the air supplementing pipe 10.
As shown in fig. 1, specifically, the air monitoring system includes a controller and a pressure probe 9, where the controller is connected with the pressure probe 9 and the valve assembly by signals, and the pressure probe 9 is disposed on the ventilation main pipe 5, and the controller may be a PLC controller or a single chip microcomputer. The pressure probe 9 can monitor the pressure change of the ventilation main pipe 5 in real time and send the data to the controller, the air pressure stability in the ventilation main pipe 5 is poor, whether fluctuation occurs is required to be observed from time to time, and the pressure value in the pipe is also the basis of whether the air supplementing pipe 10 is opened. The controller can judge the working state of the ventilation air compressor 4 according to the received pressure data, and judges whether the pressure fluctuation in the ventilation main pipe 5 or the working state of the ventilation air compressor 4 are bad according to the analysis data, if the pressure in unit time is always below a preset threshold value, the controller judges that the working state of the ventilation air compressor 4 is bad at the moment, and the controller sends a signal to the valve assembly to enable the valve assembly to be opened, so that the compressed air in the main pipe 2 for the instrument is supplemented into the ventilation main pipe 5 through the air supplementing pipe 10.
Meanwhile, the air monitoring system can also adjust the working state of the ventilation equipment. As shown in fig. 1, the ventilation device comprises a main fan 601, a secondary fan 701 and an auxiliary fan 801, wherein the main fan 601 is connected with a ventilation main pipe 5 through a main branch pipe 602, the secondary fan 701 is connected with the ventilation main pipe 5 through a secondary branch pipe 702, the auxiliary fan 801 is connected with the ventilation main pipe 5 through an auxiliary branch pipe 802, a first electromagnetic valve 603 is arranged on the main branch pipe 602, a second electromagnetic valve 703 is arranged on the secondary branch pipe 702, and a third electromagnetic valve 803 is arranged on the auxiliary branch pipe 802. The air monitoring system further comprises a main wind speed probe 604, a secondary wind speed probe 704 and an auxiliary wind speed probe 804, wherein the main wind speed probe 604 is arranged at the main fan 601, the secondary wind speed probe 704 is arranged at the auxiliary fan 701, the auxiliary wind speed probe 804 is arranged at the auxiliary fan 801, the main wind speed probe 604 is in signal connection with the first electromagnetic valve 603, the secondary wind speed probe 704 is in signal connection with the second electromagnetic valve 703, the auxiliary wind speed probe 804 is in signal connection with the third electromagnetic valve 803, and the main fan 601, the secondary fan 701, the auxiliary fan 801, the main wind speed probe 604, the secondary wind speed probe 704 and the auxiliary wind speed probe 804 are all in signal connection with the controller.
In the working process of a normal underground roadway, a main fan 601 and a secondary fan 701 are used for ventilation, a secondary fan 801 is standby, when a main wind speed probe 604 in an air monitoring system detects that the wind speed at the position of the main fan 601 is reduced below a threshold value or a secondary wind speed probe 704 detects that the wind speed at the position of the secondary fan 701 is reduced below the threshold value, the pressure in a ventilation main pipe 5 is normal, at the moment, a controller judges that the main fan 601 or the secondary fan 701 has a fault, an electromagnetic valve corresponding to the fault fan is closed, a third electromagnetic valve 803 is opened, and meanwhile, the secondary fan 801 starts to work.
In order to warn the staff in time when abnormal conditions occur, the air monitoring system further comprises an alarm assembly which is connected with the controller through signals, and the alarm assembly comprises an emitter and an audible-visual alarm. The transmitter can send a signal to the command center when the air monitoring system detects abnormal conditions, reminds the command center to send out maintenance personnel in time for maintenance, and the audible and visual alarm can send out an alarm in time when the air monitoring system detects abnormal conditions, so that on-site workers are reminded of taking measures, and the safety of underground work is improved. Among the abnormal conditions include, but are not limited to, the pressure probe 9 still detecting that the pressure in the ventilation manifold 5 is below a threshold value after the valve assembly is opened, or the wind speed at the auxiliary fan 801 decreases below a threshold value after the auxiliary fan 801 is opened.
As shown in fig. 1, the valve assembly of the air supplementing system comprises a one-way valve 12 and a secondary electromagnetic stop valve 13, wherein the one-way valve 12 and the secondary electromagnetic stop valve 13 are sequentially arranged on the air supplementing pipe 10 along the flowing direction of air, and the secondary electromagnetic stop valve 13 is in signal connection with a controller.
The check valve 12 only allows compressed air to flow from the main pipe 2 for the instrument to the main ventilation pipe 5, so that the compressed air in the main ventilation pipe 5 can be prevented from flowing backward to the main pipe 2 for the instrument after the secondary stop valve is opened by mistake or fails. The secondary shut-off valve is normally closed and is opened when compressed air in the main tube 2 for the instrument needs to be fed into the main tube 5 for ventilation by using the air supply tube 10. When the compressed air needs to be supplemented, the controller sends a signal to the secondary electromagnetic stop valve 13 to enable the secondary electromagnetic stop valve 13 to be opened, so that the compressed air in the main pipe 2 for the instrument is supplemented into the ventilation main pipe 5 through the one-way valve 12 and the secondary electromagnetic stop valve 13.
In order to prevent the compressed air in the instrument line from flowing into the ventilation line after the failure of the secondary shut-off valve, the gas supply pipe 10 is provided with a primary shut-off valve upstream of the check valve 12 in the flow direction of the gas. The primary stop valve is kept normally open no matter the secondary stop valve is in a standby state or a normal working state, and the primary stop valve can be temporarily closed to replace the secondary stop valve to work only when the secondary stop valve fails.
As shown in fig. 1, various instruments, pneumatic valves and underground workers have certain requirements on the cleanliness of the required compressed air in the actual use process, in order to improve the cleanliness of the compressed air, a purification assembly 14 is arranged between the air outlet of the air compressor 1 for the instrument and the main pipe 2 for the instrument, and/or a purification assembly 14 is arranged between the air outlet of the ventilation air compressor 4 and the main pipe 5 for the ventilation. Wherein the purification assembly 14 comprises at least one of a water separator, a filter and a dryer.
Most underground roadways adopt centrifugal air compressors, the centrifugal air compressors continuously suck external air to form continuous uninterrupted air, and a plurality of impellers are connected in series to gradually raise the wind pressure, so that the air is compressed when the air reaches a certain pressure. The source of such compressed air is usually an ambient air at the surface of the mine, and the ambient air may contain water vapor or dust, etc., and the large amount of compressed air may cause the compressed air to contain a large amount of water vapor or impurities, which may adversely affect the instruments or valves and the underground workers, and the purification assembly 14 may be provided to alleviate such adverse effects to some extent. The purification assembly 14 may include a water separator that can effectively separate moisture from air when the air is at a high humidity, the purification assembly 14 may also include a filter that can filter out impurities such as dust from the air, and the purification assembly 14 may also include a dryer that can absorb the residual moisture from the air when the air is at a normal humidity to dry the compressed air.
The implementation principle of the underground roadway air monitoring system provided by the embodiment of the application is as follows:
when the air compression system is in normal operation, the ventilator unit and the instrument unit are in decentralized operation and are independently controlled.
In one application scenario, the ventilator unit includes two ventilation air compressors 4, one for use and one for standby, and when the pressure probe 9 detects that the pressure in the ventilation main pipe 5 is continuously lower than the set threshold value, the ventilator unit can start the standby ventilation air compressors 4, and compressed air is provided by the standby ventilation air compressors 4.
When the pressure probe 9 still detects that the pressure in the ventilation main pipe 5 is continuously lower than the set threshold value after the standby ventilation air compressor 4 is started, the controller sends out a signal to control the secondary stop valve to be opened, and at the moment, the ventilation main pipe 5 is communicated with the main pipe 2 for the instrument. Taking the example that the instrument set comprises three instrument air compressors 1, two of the instrument air compressors are commonly used, one instrument set is standby, and the instrument set can provide partial compressed air which cannot be provided by the ventilator set by starting the standby instrument air compressors 1.
When the standby air compressor 1 for the instrument is started, the pressure probe 9 still detects that the pressure in the main pipe 2 for the instrument is continuously lower than the set threshold value, the controller sends a signal, the alarm assembly starts to work, the sender sends a signal to the command center to remind the command center to timely send out maintenance personnel for maintenance, and the audible and visual alarm gives an alarm to remind on-site workers to take measures.
In an application scenario, the ventilation device includes a main fan 601, a secondary fan 701 and an auxiliary fan 801, where the main fan 601 and the secondary fan 701 are commonly used, and the auxiliary fan 801 is standby. When the main wind speed probe 604 detects that the wind speed at the main fan 601 is reduced below the threshold value or the secondary wind speed probe 704 detects that the wind speed at the secondary fan 701 is reduced below the threshold value, the pressure in the ventilation main pipe 5 is normal, at the moment, the controller judges that the main fan 601 or the secondary fan 701 is in fault, the electromagnetic valve corresponding to the fault fan is closed, the third electromagnetic valve 803 is opened, and the auxiliary fan 801 starts to work. After the auxiliary fan 801 is started to work, the auxiliary wind speed probe 804 detects that the wind speed at the auxiliary fan 801 is reduced below a threshold value, and meanwhile, when the pressure in the ventilation main pipe 5 is normal, the controller sends a signal, the alarm assembly starts to work, the sender sends a signal to the command center to remind the command center to timely send out maintenance personnel for maintenance, and the audible and visual alarm gives an alarm to remind on-site workers to take measures.
The above embodiments are not intended to limit the scope of the application, so that the equivalent changes of the structure, shape and principle of the application are covered by the scope of the application.
Claims (9)
1. An underground roadway air monitoring system, comprising:
The air compression system comprises an instrument unit and a ventilator unit, wherein the instrument unit comprises a plurality of instrument air compressors (1), air outlets of the instrument air compressors (1) are all communicated with an instrument main pipe (2), the instrument main pipe (2) is connected with instrument equipment (3), the ventilator unit comprises a plurality of ventilation air compressors (4), air outlets of the ventilation air compressors (4) are all communicated with a ventilation main pipe (5), and the ventilation main pipe (5) is connected with ventilation equipment;
The air supplementing system comprises an air supplementing pipe (10) and a valve assembly for controlling the on-off of the air supplementing pipe (10), and two ends of the air supplementing pipe (10) are respectively communicated with the main pipe (2) for the instrument and the main ventilation pipe (5);
The air monitoring system is simultaneously connected with the valve assembly and the ventilation equipment in a signal mode, and is used for detecting the air circulation condition of the underground roadway and controlling the air supplementing system and the ventilation equipment according to the detected result.
2. The downhole roadway air monitoring system of claim 1, wherein the air monitoring system comprises a controller and a pressure probe (9), the controller being in signal connection with both the pressure probe (9) and the valve assembly, the pressure probe (9) being provided in the ventilation parent tube (5).
3. The underground roadway air monitoring system according to claim 2, wherein the ventilation device comprises a main fan (601), a secondary fan (701) and an auxiliary fan (801), the main fan (601) is connected with the ventilation main pipe (5) through a main branch pipe (602), the secondary fan (701) is connected with the ventilation main pipe (5) through a secondary branch pipe (702), the auxiliary fan (801) is connected with the ventilation main pipe (5) through an auxiliary branch pipe (802), a first electromagnetic valve (603) is arranged on the main branch pipe (602), a second electromagnetic valve (703) is arranged on the secondary branch pipe (702), and a third electromagnetic valve (803) is arranged on the auxiliary branch pipe (802).
4. A downhole roadway air monitoring system according to claim 3, further comprising a main wind speed probe (604), a secondary wind speed probe (704) and an auxiliary wind speed probe (804), wherein the main wind speed probe (604) is arranged at the main fan (601), the secondary wind speed probe (704) is arranged at the secondary fan (701), the auxiliary wind speed probe (804) is arranged at the auxiliary fan (801), the main wind speed probe (604) is in signal connection with the first electromagnetic valve (603), the secondary wind speed probe (704) is in signal connection with the second electromagnetic valve (703), the auxiliary wind speed probe (804) is in signal connection with the third electromagnetic valve (803), and the main wind speed probe (604), the secondary wind speed probe (704) and the auxiliary wind speed probe (804) are in signal connection with the controller.
5. The downhole roadway air monitoring system of claim 4, further comprising an alarm assembly in signal communication with the controller, the alarm assembly comprising an annunciator and an audible-visual annunciator.
6. The underground roadway air monitoring system according to claim 2, wherein the air supplementing pipe (10) is used for conveying compressed air in the main pipe (2) for instruments into the main ventilation pipe (5), the valve assembly comprises a one-way valve (12) and a secondary electromagnetic stop valve (13), the one-way valve (12) and the secondary electromagnetic stop valve (13) are sequentially arranged on the air supplementing pipe (10) along the flowing direction of gas, and the secondary electromagnetic stop valve (13) is in signal connection with the controller.
7. The downhole roadway air monitoring system of claim 6, wherein the valve assembly further comprises a primary electromagnetic shut-off valve (11), the primary electromagnetic shut-off valve (11) is disposed in the make-up tube (10), and the primary electromagnetic shut-off valve (11) is disposed upstream of the one-way valve (12) in a gas flow direction, the primary electromagnetic shut-off valve (11) being in signal connection with the controller.
8. A downhole roadway air monitoring system according to claim 1, wherein a purification assembly (14) is arranged between the air outlet of the instrument air compressor (1) and the instrument main (2), and/or wherein a purification assembly (14) is arranged between the air outlet of the ventilation air compressor (4) and the ventilation main (5).
9. The downhole roadway air monitoring system of claim 8, wherein the purification assembly (14) comprises at least one of a water separator, a filter, and a dryer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421530321.8U CN222596114U (en) | 2024-06-28 | 2024-06-28 | An underground tunnel air monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421530321.8U CN222596114U (en) | 2024-06-28 | 2024-06-28 | An underground tunnel air monitoring system |
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| Publication Number | Publication Date |
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| CN222596114U true CN222596114U (en) | 2025-03-11 |
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| CN202421530321.8U Active CN222596114U (en) | 2024-06-28 | 2024-06-28 | An underground tunnel air monitoring system |
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| CN (1) | CN222596114U (en) |
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