CN109541679A - A kind of novel artificial focus - Google Patents
A kind of novel artificial focus Download PDFInfo
- Publication number
- CN109541679A CN109541679A CN201910034673.1A CN201910034673A CN109541679A CN 109541679 A CN109541679 A CN 109541679A CN 201910034673 A CN201910034673 A CN 201910034673A CN 109541679 A CN109541679 A CN 109541679A
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- China
- Prior art keywords
- bay section
- oxygen
- fuel gas
- outer tube
- novel artificial
- 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
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000001301 oxygen Substances 0.000 claims abstract description 73
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 73
- 239000002737 fuel gas Substances 0.000 claims abstract description 49
- 239000007789 gas Substances 0.000 claims abstract description 35
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000004880 explosion Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 5
- 239000000565 sealant Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005474 detonation Methods 0.000 abstract description 2
- 239000002360 explosive Substances 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 230000005284 excitation Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- SPSSULHKWOKEEL-UHFFFAOYSA-N 2,4,6-trinitrotoluene Chemical compound CC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O SPSSULHKWOKEEL-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000015 trinitrotoluene Substances 0.000 description 2
- -1 TNT explosive Chemical compound 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 208000021760 high fever Diseases 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/02—Generating seismic energy
- G01V1/133—Generating seismic energy using fluidic driving means, e.g. highly pressurised fluids; using implosion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V2210/00—Details of seismic processing or analysis
- G01V2210/10—Aspects of acoustic signal generation or detection
- G01V2210/12—Signal generation
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a kind of novel artificial focus, including outer tube, it is coaxially arranged with the inner tube that subregion from left to right is set as fuel gas bay section and oxygen bay section in outer tube, is connected to or turns off by ball valve between fuel gas bay section and oxygen bay section；The end that the fuel gas bay section corresponds to outer tube is provided with gas nozzle；It is provided through the gap of oxygen hose between the oxygen bay section and outer tube wall, puts the igniter used after being provided with methane gas and oxygen mix on the oxygen bay section inner tubal wall in the corresponding gap；Oxygen bay section end is provided with before explosion and seals oxygen bay section, opens in explosion to form the diaphragm of airflow channel；The controller of control ball valve and igniter movement is additionally provided in gap between the fuel gas bay section and outer tube.The present invention uses fuel gas, is designed by the volume ratio of fuel gas bay section and oxygen bay section, it is ensured that the full combustion of fuel gas and oxygen, fuel gas carries out reacting release amount of heat with pure oxygen and gas achievees the effect that detonation.
Description
Technical field
The present invention relates to mineral exploration technique field, especially a kind of man-made explosion.
Background technique
In seismology, focus is the initial position that earthquake occurs, and tomography starts the place of rupture, and focus is upwards in the earth
Upright projection on surface is known as earthquake centre.Focus is the place of seismic energy accumulation and release, has a certain size region, also known as
Focal area or focal body.Earthquake is divided into earthquake and artificial earthquake two major classes, and wherein artificial earthquake is caused by human activity
Earthquake, the focus of earthquake caused by human factor claims man-made explosion, and man-made explosion is typically used in seismic prospecting, that is, is utilized
The feature of Underground geologic body is gone in the earthquake that human factor causes.
Man-made explosion is divided into two classes: one kind is dynamite source, and another kind of is non-explosive source.And in seismic survey work
In, for many years focus, wherein effect preferably trinitrotoluene, i.e. TNT explosive, its tool are used as using various explosives always
There are powerful explosions, has a safety feature；Certainly nitrolite can also be used, security performance is more preferable, but other performance ratio
The former is poor.Dynamite source has wide frequency spectrum, is suitable for high frequency (being greater than 80 cycle per seconds), intermediate frequency (15-80 cycle per second), low frequency (6-
15 cycle per seconds) seismic prospecting.The energy of explosive can not largely disappear all on the significant wave required for seismic prospecting
It consumes in keeping surrounding medium broken or formation permanent deformation, part is then as seismic interference.It is especially quick-fried in dry loose rock
When fried, effective energy is lower；The explosion time only in water or aqueous plasticity medium, can just obtain good earthquake effect.
In recent years the non-explosive source occurred just step by step replace dynamite source, the representative of non-explosive source have hammering focus,
Electromagnetic seismic source and spark source.
Hammering focus environmental pollution is small, excitation is controllable, strong interference immunity, can be used according to different detection targets different
Hammer focus.If the non-destructive testing of bridge, workpiece needs dedicated hand hammer, guarantee that the frequency of excitation is sufficiently high, resolution ratio is sufficiently large；
When detection target is the dead zone of several meters to tens meters of underground, unconsolidated formation, need using sledgehammer；When investigation depth reaches hundred meter levels,
When detection target is reservoir, distribution of strata, then need using large-scale pound seismic sources.Although it is wider to hammer focus application range,
It is that it is appropriate only for the occasion not high to resolution requirement, and energy consumption is big, is not particularly suitable in Mountainous Regions as focus
It uses.
Electromagnetic seismic source is generally made of control cabinet and jump bit two parts, is a kind of pulse shock focus, be can be used for 100 meters
Within shallow seismic exploration, especially hard surfacing.The wave frequency rate of electromagnetic seismic source excitation is abundant, not damaged road surface, does not have to beat
Hole, for hammering focus, cost is slightly higher, and transport it is convenient not as good as sledgehammer, be relatively suitable for urban pavement empty detection,
The fields such as pipeline detection, Air-raid Shelter Exploration, Metro Line Selection.
Spark source is one kind of electric energy focus, is to be added to the electric energy stored using capacitor to be pre-placed in water
In electrode on, in extremely short moment (Microsecond grade) release high-voltage electricity (discharging), up to ten thousand degrees Celsius of electric arc is formed, by steam
Change, generates percussive pressure Reeb；But spark source can only use in water.
Above-mentioned non-explosive source all has some limitations, and is unable to satisfy the requirement of seismic survey.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of novel artificial focus, are surveyed with meeting the earthquake of different occasions
It surveys and requires.
In order to solve the above technical problems, the technical solution used in the present invention is as follows.
A kind of novel artificial focus, including cylindrical outer tube, being coaxially arranged with that subregion from left to right is set as in outer tube can
The inner tube of combustion gas body bay section and oxygen bay section, the ball between fuel gas bay section and oxygen bay section by being fixed on outer tube wall
Valve connection or shutdown；The end that the fuel gas bay section corresponds to outer tube is provided with the transporting combustible gases into fuel gas bay section
Gas nozzle；Oxygen hose is provided through between the oxygen bay section and outer tube wall between the conveying oxygen into oxygen bay section
Gap corresponds to and puts the igniter used after being provided with fuel gas and oxygen mix on the oxygen bay section inner tubal wall in the gap；It is described
Oxygen bay section end is provided with before explosion and seals oxygen bay section, opens in explosion to form the diaphragm of airflow channel；It is described
The controller of control ball valve and igniter movement is additionally provided in gap between fuel gas bay section and outer tube.
A kind of above-mentioned novel artificial focus, the interior fuel gas filled of the fuel gas bay section is methane, fuel gas
The diameter of inner pipe of bay section is equal with the diameter of inner pipe of oxygen bay section, length ratio 1:2.
A kind of above-mentioned novel artificial focus is fixedly installed connection ring, the combustible gas in the inner wall at end of the outer tube
The end of body bay section is fixedly connected by flange with connection ring；Sealing cover is provided between flange and connection ring, the gas nozzle is worn
It is located at the center of sealing cover, gas nozzle is pressed on sealing cover outer end face by nut.
A kind of above-mentioned novel artificial focus, being embedded between the sealing cover and gas nozzle outer wall prevents fuel gas from leaking
O-ring seal.
A kind of above-mentioned novel artificial focus, offers the via hole for passing through oxygen hose in the connection ring, oxygen hose according to
Secondary pass through extend into oxygen bay section behind gap between gap, ball valve seat and oxygen bay section and outer tube between fuel gas bay section and outer tube
Inner cavity.
A kind of above-mentioned novel artificial focus, the front end of the outer tube, which is bolted to be provided with center band air-flow and spray, to be led to
The end cover in road, the diaphragm are fixed by diaphragm deck of the clamping between oxygen bay section inner tube flange and end cover.
A kind of above-mentioned novel artificial focus, the end cover are pyramidal structure.
A kind of above-mentioned novel artificial focus, the diaphragm deck are flexible material.
A kind of above-mentioned novel artificial focus, the igniter are mounted on oxygen bay section by filling sealant in through-holes
On tube wall.
Due to using above technical scheme, the invention technological progress is as follows.
The present invention uses fuel gas, is designed by the volume ratio of fuel gas bay section and oxygen bay section, it is ensured that
The full combustion of fuel gas and oxygen, fuel gas carries out reacting release amount of heat with pure oxygen and gas reaches the effect of detonation
Fruit.The present invention does not mix in injection process in fuel gas with oxygen, after the completion of gas to be implanted, then starts to mix, mixing
It lights a fire again after a certain period of time, ensure that the safe and reliable of operating process；By controlling to oxygen bay section and fuel gas cabin
The gas pressure of section conveying, can control the frequency of focus, to meet the seismic survey requirement of different occasions.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Wherein: 1, connection ring, 2, sealing cover, 3, oxygen hose, 4, oxygen bay section, 5, outer tube, 6, O-ring seal, 7, gas nozzle,
8, nut, 9, fuel gas bay section, 10, ball valve, 11, igniter, 12, end cover, 13, diaphragm deck, 14, diaphragm, 15, control
Device processed, 16, sealant.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be described in further detail.
A kind of novel artificial focus, structure are coaxially arranged with two in outer tube as shown in Figure 1, including cylindrical outer tube 5
Inner tube, is provided with gap between inner tube and outer tube, between two inner tubes by the connection of ball valve 10 that is fixed on outer tube wall or
Shutdown；The inner tube of corresponding outer pipe end is fuel gas bay section 9, and the inner tube of corresponding outer tube front end is oxygen bay section 4, fuel gas
The diameter of inner pipe of bay section is equal with the diameter of inner pipe of oxygen bay section.In the present invention, fuel gas uses methane, therefore fuel gas
The inner tube of bay section and the inner tube length ratio setting of oxygen bay section are 1:2.
Connection ring 1 is fixedly installed in the inner wall at end of outer tube 5, the end of fuel gas bay section passes through flange and connection ring
1 is fixedly connected；Sealing cover 2 is provided between flange and connection ring 1, the center of sealing cover 2 is equipped with gas nozzle 7, and gas nozzle passes through spiral shell
Mother 8 is pressed on sealing cover outer end face, and gas nozzle is connected to after methane gas source the transport methane gas into fuel gas bay section by tracheae
Body.To prevent methane gas from leaking, the present invention has been embedded in O-ring seal 6 between sealing cover and gas nozzle outer wall.
Via hole is offered in connection ring 1, and oxygen hose 3, oxygen are provided in the gap between oxygen bay section 4 and outer tube wall
One end of pipe 3 is connected to source of oxygen after passing through via hole by tracheae, the other end of oxygen hose sequentially pass through fuel gas bay section and
It extend into oxygen bay section inner cavity between outer tube between gap, ball valve seat and oxygen bay section and outer tube behind gap, is used for oxygen bay section
Interior conveying oxygen.
The front end of outer tube, which is bolted, is provided with the end cover 12 that center band air-flow sprays channel, and diaphragm 14 passes through
Diaphragm deck 13 of the clamping between oxygen bay section inner tube flange and end cover 12 is fixed；Wherein diaphragm 14 is sealed before explosion
Oxygen bay section opens airflow channel in explosion.In the present invention, end cover is pyramidal structure, and diaphragm deck is flexible material
Production discharges high pressure, high thermal current to guarantee that diaphragm can smoothly fall off under airflow function in explosion moment.
Igniter 11 is provided on oxygen bay section tube wall of the present invention, igniter 11 passes through filling sealant 16 in through-holes
It is mounted on oxygen bay section tube wall, for lighting mixed methane gas and oxygen.Between fuel gas bay section and outer tube
Gap in be additionally provided with controller 15, for control ball valve 10 movement and igniter 11 light a fire.
Then the present invention presses in use, respectively by tracheae connection oxygen hose and source of oxygen and gas nozzle and methane gas source
Methane gas is injected into fuel gas bay section simultaneously according to uniform pressure, injects oxygen into oxygen bay section, and pressure is controlled 25
Under atmospheric pressure, gas controls ball valve by controller after injecting and opens, and two kinds of gases are sufficiently mixed, after 3 hours to be mixed,
Igniter fire is controlled by controller, puts mixed gas full combustion then, generates high fever, high air blast breaks through diaphragm and leads to
Airflow channel release is crossed, to achieve the effect that man-made explosion.
Certainly, the pressure of gas can be set according to focus frequency requirement in inner tube of the present invention, be accomplished effectively controllably, full
The requirement of sufficient different earthquake exploration.Meanwhile fuel gas can also use other fuel gas, should change simultaneously combustible gas at this time
The volume ratio of body bay section and oxygen bay section, to guarantee the full combustion of fuel gas and oxygen.
Claims (9)
1. a kind of novel artificial focus, it is characterised in that: including cylindrical outer tube (5), be coaxially arranged with from left to right in outer tube
Subregion is set as the inner tube of fuel gas bay section (9) and oxygen bay section (4), between fuel gas bay section (9) and oxygen bay section (4)
Pass through ball valve (10) connection or shutdown being fixed on outer tube wall；The end of the corresponding outer tube of the fuel gas bay section (9) is set
It is equipped with the gas nozzle (7) of the transporting combustible gases into fuel gas bay section；It is provided between the oxygen bay section (4) and outer tube wall
The gap of oxygen is conveyed into oxygen bay section across oxygen hose (3), is provided on the oxygen bay section inner tubal wall in the corresponding gap
The igniter (11) used is put after fuel gas and oxygen mix；Oxygen bay section end, which is provided with before explosion, seals oxygen
Bay section is opened in explosion to form the diaphragm (14) of airflow channel；In gap between the fuel gas bay section and outer tube
It is additionally provided with the controller (15) of control ball valve (10) and igniter (11) movement.
2. a kind of novel artificial focus according to claim 1, it is characterised in that: filled in the fuel gas bay section
Fuel gas is methane, and the diameter of inner pipe of fuel gas bay section is equal with the diameter of inner pipe of oxygen bay section, length ratio 1:2.
3. a kind of novel artificial focus according to claim 1, it is characterised in that: fixed in the inner wall at end of the outer tube
It is provided with connection ring (1), the end of the fuel gas bay section is fixedly connected by flange with connection ring；Flange and connection ring
(1) it is provided between sealing cover (2), the gas nozzle (7) is threaded through the center of sealing cover (2), and gas nozzle is pressed on by nut (8)
On sealing cover outer end face.
4. a kind of novel artificial focus according to claim 3, it is characterised in that: between the sealing cover and gas nozzle outer wall
Embedded with the O-ring seal (6) for preventing fuel gas from leaking.
5. a kind of novel artificial focus according to claim 3, it is characterised in that: opened up on the connection ring (1) useful
In the via hole for passing through oxygen hose (3), oxygen hose (3) sequentially passes through gap, ball valve seat and oxygen between fuel gas bay section and outer tube
Oxygen bay section inner cavity is extend between gas bay section and outer tube behind gap.
6. a kind of novel artificial focus according to claim 1, it is characterised in that: the front end of the outer tube is solid by bolt
Surely it is provided with the end cover (12) that center band air-flow sprays channel, the diaphragm (14) is by clamping in oxygen bay section inner tube method
Diaphragm deck (13) between blue and end cover (12) is fixed.
7. a kind of novel artificial focus according to claim 6, it is characterised in that: the end cover is pyramidal structure.
8. a kind of novel artificial focus according to claim 6, it is characterised in that: the diaphragm deck is flexible material.
9. a kind of novel artificial focus according to claim 1, it is characterised in that: the igniter (11) by it is filling
Sealant (16) in through-hole is mounted on oxygen bay section tube wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910034673.1A CN109541679B (en) | 2019-01-15 | 2019-01-15 | Novel artificial seismic source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910034673.1A CN109541679B (en) | 2019-01-15 | 2019-01-15 | Novel artificial seismic source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109541679A true CN109541679A (en) | 2019-03-29 |
| CN109541679B CN109541679B (en) | 2024-03-15 |
Family
ID=65835125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910034673.1A Active CN109541679B (en) | 2019-01-15 | 2019-01-15 | Novel artificial seismic source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109541679B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646836A (en) * | 2019-10-15 | 2020-01-03 | 四川伟博震源科技有限公司 | Gas explosion transverse wave seismic source excitation device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3314497A (en) * | 1963-10-07 | 1967-04-18 | Sinclair Research Inc | Gas exploder seismic energy source |
| US4193472A (en) * | 1978-07-21 | 1980-03-18 | Exxon Production Research Company | Open-ended seismic source |
| US4667766A (en) * | 1984-10-24 | 1987-05-26 | British Gas Corporation | Seismic pulse generator |
| CN2383840Y (en) * | 1999-07-19 | 2000-06-21 | 中国地质大学（武汉） | Gas phase priming device |
| GB201310908D0 (en) * | 2013-06-19 | 2013-07-31 | Macrocom 1010 Ltd | Pulse detonation seismic energy source |
| CN204515153U (en) * | 2015-01-29 | 2015-07-29 | 湘潭无线电有限责任公司 | The power valve of high-power program control focus |
| CN105353404A (en) * | 2015-12-02 | 2016-02-24 | 西南石油大学 | Gas drilling shaft bottom near-bit continuous impact focus nipple |
| CN106556543A (en) * | 2016-11-10 | 2017-04-05 | 北京理工大学 | For the fuel gas detonation driven generator of High speed load |
| CN107167836A (en) * | 2017-05-25 | 2017-09-15 | 黄河水利委员会黄河水利科学研究院 | A kind of intelligent controlled source of big energy |
| CN209387892U (en) * | 2019-01-15 | 2019-09-13 | 康会峰 | A kind of novel artificial focus |
-
2019
- 2019-01-15 CN CN201910034673.1A patent/CN109541679B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3314497A (en) * | 1963-10-07 | 1967-04-18 | Sinclair Research Inc | Gas exploder seismic energy source |
| US4193472A (en) * | 1978-07-21 | 1980-03-18 | Exxon Production Research Company | Open-ended seismic source |
| US4667766A (en) * | 1984-10-24 | 1987-05-26 | British Gas Corporation | Seismic pulse generator |
| CN2383840Y (en) * | 1999-07-19 | 2000-06-21 | 中国地质大学（武汉） | Gas phase priming device |
| GB201310908D0 (en) * | 2013-06-19 | 2013-07-31 | Macrocom 1010 Ltd | Pulse detonation seismic energy source |
| CN204515153U (en) * | 2015-01-29 | 2015-07-29 | 湘潭无线电有限责任公司 | The power valve of high-power program control focus |
| CN105353404A (en) * | 2015-12-02 | 2016-02-24 | 西南石油大学 | Gas drilling shaft bottom near-bit continuous impact focus nipple |
| CN106556543A (en) * | 2016-11-10 | 2017-04-05 | 北京理工大学 | For the fuel gas detonation driven generator of High speed load |
| CN107167836A (en) * | 2017-05-25 | 2017-09-15 | 黄河水利委员会黄河水利科学研究院 | A kind of intelligent controlled source of big energy |
| CN209387892U (en) * | 2019-01-15 | 2019-09-13 | 康会峰 | A kind of novel artificial focus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646836A (en) * | 2019-10-15 | 2020-01-03 | 四川伟博震源科技有限公司 | Gas explosion transverse wave seismic source excitation device and method |
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| Publication number | Publication date |
|---|---|
| CN109541679B (en) | 2024-03-15 |
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