CN113864656A - Safety prevention and control system for blast furnace gas power generation - Google Patents
Safety prevention and control system for blast furnace gas power generation Download PDFInfo
- Publication number
- CN113864656A CN113864656A CN202111348579.7A CN202111348579A CN113864656A CN 113864656 A CN113864656 A CN 113864656A CN 202111348579 A CN202111348579 A CN 202111348579A CN 113864656 A CN113864656 A CN 113864656A
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- China
- Prior art keywords
- contact
- fixedly connected
- blast furnace
- furnace gas
- connecting pipe
- 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.)
- Granted
Links
- 238000010248 power generation Methods 0.000 title claims abstract description 17
- 230000002265 prevention Effects 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000003825 pressing Methods 0.000 claims abstract description 16
- 230000006835 compression Effects 0.000 claims abstract description 11
- 238000007906 compression Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims abstract description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 239000007789 gas Substances 0.000 description 20
- 239000000428 dust Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
- F16K31/042—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves with electric means, e.g. for controlling the motor or a clutch between the valve and the motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a safety prevention and control system for blast furnace gas power generation, which relates to the technical field of gas power generation and comprises a connecting pipe, a pressure detection device, a control device and an adjusting device, wherein the pressure detection device, the control device and the adjusting device are arranged on the connecting pipe, two ends of the connecting pipe are fixedly connected with flanges, the control device comprises a detection pipe and a lifting column arranged in the detection pipe, the bottom of the lifting column is fixedly connected with a pressing plate, the bottom end of the lifting column is fixedly connected with the pressing plate, the pressing plate is in sliding fit with the inner cavity of the detection pipe, the bottom surface of the pressing plate is fixedly connected with a sealing gasket, and a compression spring sleeved outside the lifting column is arranged between the top surface of the pressing plate and the bottom surface of the inner wall of the detection pipe. This blast furnace gas is safety prevention and control system for electricity generation sets up through the cooperation of travel switch and first stroke contact piece and second stroke contact piece, at the in-process of using device, when the gas pressure in the connecting tube is too big, both can send the early warning and can close the device automatically again, has reduced the danger in the use, guarantees staff's safety.
Description
Technical Field
The invention relates to the technical field of gas power generation, in particular to a safety prevention and control system for blast furnace gas power generation.
Background
Blast furnace gas is a byproduct combustible gas in the blast furnace ironmaking production process. Its approximate components are carbon dioxide, carbon monoxide, hydrogen, nitrogen, hydrocarbons and a small amount of sulfur dioxide, its dust concentration is 10-50 g/cubic meter (standard condition), and its dust production quantity is averagely 50kg/t (pig iron) -75kg/t (pig iron). The particle size of the dust is below 500 mu m, the dust is mainly iron, ferrous oxide, alumina, silicon oxide, magnesium oxide and coke powder, the gas containing combustible carbon monoxide is a gas fuel with low calorific value, can be used as self-use gas of metallurgical enterprises, such as hot-rolled steel ingots, preheated ladles and the like, blast furnace gas can be used as a heating fuel for steel plants and can also be used for other purposes such as power generation and the like, and the utilization of the part of byproduct energy can not only reduce the energy consumption of the enterprises, but also improve the pollution of the steel enterprises to the surrounding environment. When the pressure of the connecting pipe changes in the process of transporting the blast furnace gas by using the connecting pipe, the valve of the connecting pipe cannot be closed in time, so that the danger in the process of using the blast furnace gas is increased, and the safety of workers is threatened.
Therefore, it is necessary to provide a safety control system for blast furnace gas power generation to solve the above problems.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a safety prevention and control system for blast furnace gas power generation, which aims to solve the problems that in the process of using a connecting pipe for conveying blast furnace gas, when the pressure of the connecting pipe changes, the connecting pipe valve cannot be closed in time, the danger is increased in the process of using the blast furnace gas, and the safety of workers is threatened.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a safety prevention and control system for blast furnace gas power generation comprises a connecting pipe, a pressure detection device, a control device and an adjusting device, wherein the pressure detection device, the control device and the adjusting device are arranged on the connecting pipe, flanges are fixedly connected to two ends of the connecting pipe, the control device comprises a detection pipe and a lifting column arranged in the detection pipe, the bottom of the lifting column is fixedly connected with a pressing plate which is in sliding fit with an inner cavity of the detection pipe, a sealing gasket is fixedly connected to the bottom surface of the pressing plate, a compression spring sleeved outside the lifting column is arranged between the top surface of the pressing plate and the bottom surface of the inner wall of the detection pipe, a rack is fixedly connected to one end, protruding out of the top surface of the detection pipe, of the lifting column, the control device comprises a shell and a travel switch arranged at the position of the shell, a support is fixedly connected to the outer circular surface of the connecting pipe, and the shell is fixedly connected to the top end of the support, the gear rack is characterized in that a rotating shaft is rotatably connected to the two side plates in the shell, a gear meshed with the gear rack is rotatably connected to the center of the rotating shaft, first stroke contact blocks and second stroke contact blocks are symmetrically distributed at two ends of the rotating shaft, and first contacts and second contacts are respectively arranged on the outer circular surfaces of the first stroke contact blocks and the second stroke contact blocks.
Preferably, the control device comprises an installation frame and a motor which are fixedly connected to the outer circular surface of the connecting pipe, and an output shaft of the motor is fixedly connected with a ball valve which is located in the connecting pipe.
Preferably, the first stroke contact block and the second stroke contact block are circular and have the same diameter, and the first contact and the second contact are both arc-shaped.
Preferably, the first contact and the second contact are on the same plane, and the length of the first contact is greater than that of the second contact.
Preferably, the distance between the top end of the rack and the top of the inner wall of the shell is larger than the distance between the top of the inner wall of the detection tube and the top of the pressure plate.
Preferably, the arc length between the abutting position of the travel switch roller and the first travel contact block and the first contact point is smaller than the distance between the top of the inner wall of the detection tube and the top of the pressing plate in a compression state of the compression spring.
(III) advantageous effects
Compared with the prior art, the invention provides a safety prevention and control system for blast furnace gas power generation, which has the following beneficial effects:
this blast furnace gas is safety prevention and control system for electricity generation sets up through the cooperation of travel switch and first stroke contact piece and second stroke contact piece, at the in-process of using device, when the gas pressure in the connecting tube is too big, both can send the early warning and can close the device automatically again, has reduced the danger in the use, guarantees staff's safety.
Drawings
FIG. 1 is an axial schematic view of the structure of the present invention;
FIG. 2 is a schematic side sectional view of a partial structure of the present invention;
FIG. 3 is a schematic side sectional view of the housing structure of the present invention;
FIG. 4 is a schematic side sectional view of a detection tube structure according to the present invention.
In the figure: 1. a connecting pipe; 2. a travel switch; 3. a motor; 4. a mounting frame; 5. a housing; 6. a support; 7. a flange; 9. a ball valve; 10. a detection tube; 11. a rotating shaft; 12. a rack; 13. a second stroke contact block; 14. a second contact; 15. a gear; 16. a first contact; 17. a first stroke contact block; 18. pressing a plate; 19. a gasket; 20. a compression spring; 21. and (4) lifting the column.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, a safety control system for blast furnace gas power generation comprises a connecting pipe 1, a pressure detecting device, a control device and an adjusting device, wherein the pressure detecting device, the control device and the adjusting device are arranged on the connecting pipe 1, flanges 7 are fixedly connected to both ends of the connecting pipe 1, the control device comprises a detecting pipe 10 and a lifting column 21 arranged in the detecting pipe 10, a pressing plate 18 which is in sliding fit with an inner cavity of the detecting pipe 10 is fixedly connected to the bottom of the lifting column 21, a sealing gasket 19 is fixedly connected to the bottom of the pressing plate 18, a compression spring 20 sleeved outside the lifting column 21 is arranged between the top of the pressing plate 18 and the bottom of the inner wall of the detecting pipe 10, a rack 12 is fixedly connected to one end of the lifting column 21, which protrudes out of the top of the detecting pipe 10, the control device comprises a housing 5 and a travel switch 2 arranged at one side plate of the housing 5, a support 6 is fixedly connected to the outer circumferential surface of the connecting pipe 1, which is positioned outside the detecting pipe 10, the top of shell 5 fixed connection and support 6, the inside of rack 12 position and shell 5, it is connected with pivot 11 to rotate on the both sides board in the shell 5, the center department of pivot 11 rotates and is connected with the gear 15 with rack 12 meshing, the both ends symmetric distribution of pivot 11 has first stroke contact block 17 and second stroke contact block 13, be equipped with first contact 16 and second contact 14 on the outer disc of first stroke contact block 17 and second stroke contact block 13 respectively.
The control device comprises a mounting frame 4 and a motor 3 which are fixedly connected to the outer circular surface of the connecting pipe 1, and an output shaft of the motor 3 is fixedly connected with a ball valve 9 located in the connecting pipe 1.
The first stroke contact block 17 and the second stroke contact block 13 are circular and have the same diameter, and the first contact 16 and the second contact 14 are both arc-shaped, so that the roller is conveniently lifted up and prevented from being clamped.
The first contact 16 and the second contact 14 are on the same plane, and the length of the first contact 16 is longer than that of the second contact 14, so that the first contact 16 and the second contact 14 are in contact with the two travel switches 2 for different time periods, and different actions can be realized.
The distance between the top end of the rack 12 and the top of the inner wall of the housing 5 is larger than the distance between the top of the inner wall of the detection tube 10 and the top of the pressure plate 18.
The arc length between the contact position of the roller of the travel switch 2 and the first travel contact block 17 and the first contact point is smaller than the distance between the top of the inner wall of the detection tube 10 and the top of the pressure plate 18 in the compressed state of the compression spring 20, and the connecting tube 1 can be closed before the compression spring 20 is compressed to the limit.
The working principle is as follows: when the device is used, after the pressure in the pipeline is increased, the pressure in the pipeline pushes a sealing gasket 19 in a detection pipe 10 to move upwards to push a lifting rod to move upwards, in the process of lifting the lifting rod, a gear 15 is driven to rotate a rotating shaft 11, under the action of the rotating shaft 11, a first stroke contact block 17 and a second stroke contact block 13 at two ends of the rotating shaft 11 rotate to drive a first contact 16 and a second contact 14 to deflect, when the first contact 16 contacts a stroke switch 2, an alarm is sent to a control terminal to start a motor 3, the ball valve 9 in the rotating device closes a connecting pipe 1, and when the first contact 16 contacts the stroke switch 2, if the control terminal does not act, the second contact 14 contacts another stroke switch 2, the second travel switch 2 can directly control the motor 3 to rotate, so as to close the connecting pipe 1.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a blast furnace gas safety prevention and control system for electricity generation which characterized in that: the device comprises a connecting pipe (1), a pressure detection device, a control device and an adjusting device which are arranged on the connecting pipe (1), wherein flanges (7) are fixedly connected to two ends of the connecting pipe (1), the control device comprises a detection pipe (10) and a lifting column (21) arranged in the detection pipe (10), the bottom of the lifting column (21) is fixedly connected with a pressing plate (18) which is in sliding fit with an inner cavity of the detection pipe (10), the bottom surface of the pressing plate (18) is fixedly connected with a sealing gasket (19), a compression spring (20) sleeved outside the lifting column (21) is arranged between the top surface of the pressing plate (18) and the bottom surface of the inner wall of the detection pipe (10), one end of the lifting column (21) protruding out of the top surface of the detection pipe (10) is fixedly connected with a rack (12), the control device comprises a shell (5) and a travel switch (2) arranged at one side plate of the shell (5), the outer disc of connecting pipe (1) is located detecting tube (10) outside fixedly connected with support (6), the top of shell (5) fixed connection and support (6), rack (12) position and the inside of shell (5), it is connected with pivot (11) to rotate on the both sides board in shell (5), the center department of pivot (11) rotates and is connected with gear (15) with rack (12) meshing, the both ends symmetric distribution of pivot (11) has first stroke to contact piece (17) and second stroke to contact piece (13), be equipped with first contact (16) and second contact (14) on the outer disc of first stroke contact piece (17) and second stroke contact piece (13) respectively.
2. The safety prevention and control system for blast furnace gas power generation according to claim 1, characterized in that: the control device comprises a mounting frame (4) and a motor (3) which are fixedly connected to the outer circular surface of the connecting pipe (1), and an output shaft of the motor (3) is fixedly connected with a ball valve (9) located in the connecting pipe (1).
3. The safety prevention and control system for blast furnace gas power generation according to claim 1, characterized in that: the first stroke contact block (17) and the second stroke contact block (13) are circular and have the same diameter, and the first contact (16) and the second contact (14) are both arc-shaped.
4. The safety prevention and control system for blast furnace gas power generation according to claim 1, characterized in that: the first contact (16) and the second contact (14) are on the same plane, and the length of the first contact (16) is larger than that of the second contact (14).
5. The safety prevention and control system for blast furnace gas power generation according to claim 1, characterized in that: the distance between the top end of the rack (12) and the top of the inner wall of the shell (5) is larger than the distance between the top of the inner wall of the detection tube (10) and the top of the pressure plate (18).
6. The safety prevention and control system for blast furnace gas power generation according to claim 1, characterized in that: the arc length between the abutting position of the roller of the travel switch (2) and the first travel contact block (17) and the first contact point is smaller than the distance between the top of the inner wall of the detection tube (10) and the top of the pressure plate (18) under the compression state of the compression spring (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111348579.7A CN113864656B (en) | 2021-11-15 | 2021-11-15 | Safety prevention and control system for blast furnace gas power generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111348579.7A CN113864656B (en) | 2021-11-15 | 2021-11-15 | Safety prevention and control system for blast furnace gas power generation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113864656A true CN113864656A (en) | 2021-12-31 |
| CN113864656B CN113864656B (en) | 2024-07-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111348579.7A Active CN113864656B (en) | 2021-11-15 | 2021-11-15 | Safety prevention and control system for blast furnace gas power generation |
Country Status (1)
| Country | Link |
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| CN (1) | CN113864656B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1129179A (en) * | 1966-09-23 | 1968-10-02 | Dunedin Instrumentation Ltd | Pressure-responsive switch or transducer |
| CN2268855Y (en) * | 1996-08-15 | 1997-11-26 | 黎勇生 | Mechanical drive of gas protection valve |
| KR19980057023U (en) * | 1997-01-24 | 1998-10-15 | 차인호 | Gas shutoff |
| CN103821992A (en) * | 2012-11-16 | 2014-05-28 | 大连奕格科技开发有限公司 | Automatic gas-leakage valve closing device |
| RU192341U1 (en) * | 2019-05-16 | 2019-09-13 | Российская Федерация, От Имени Которой Выступает Министерство Промышленности И Торговли Российской Федерации | Trip switch control unit |
| CN110440139A (en) * | 2019-08-30 | 2019-11-12 | 深圳市超为龙科技有限公司 | A kind of device of sectional control gas |
| CN210014210U (en) * | 2019-03-04 | 2020-02-04 | 南通职业大学 | Automatic pressure control device for gas supply |
-
2021
- 2021-11-15 CN CN202111348579.7A patent/CN113864656B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1129179A (en) * | 1966-09-23 | 1968-10-02 | Dunedin Instrumentation Ltd | Pressure-responsive switch or transducer |
| CN2268855Y (en) * | 1996-08-15 | 1997-11-26 | 黎勇生 | Mechanical drive of gas protection valve |
| KR19980057023U (en) * | 1997-01-24 | 1998-10-15 | 차인호 | Gas shutoff |
| CN103821992A (en) * | 2012-11-16 | 2014-05-28 | 大连奕格科技开发有限公司 | Automatic gas-leakage valve closing device |
| CN210014210U (en) * | 2019-03-04 | 2020-02-04 | 南通职业大学 | Automatic pressure control device for gas supply |
| RU192341U1 (en) * | 2019-05-16 | 2019-09-13 | Российская Федерация, От Имени Которой Выступает Министерство Промышленности И Торговли Российской Федерации | Trip switch control unit |
| CN110440139A (en) * | 2019-08-30 | 2019-11-12 | 深圳市超为龙科技有限公司 | A kind of device of sectional control gas |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113864656B (en) | 2024-07-05 |
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