CN112944934A - Sealed energy-saving observation door with sight glass - Google Patents
Sealed energy-saving observation door with sight glass Download PDFInfo
- Publication number
- CN112944934A CN112944934A CN202110316761.8A CN202110316761A CN112944934A CN 112944934 A CN112944934 A CN 112944934A CN 202110316761 A CN202110316761 A CN 202110316761A CN 112944934 A CN112944934 A CN 112944934A
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- door
- door frame
- sight glass
- heat insulation
- assembly
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- 239000011521 glass Substances 0.000 title claims abstract description 58
- 238000009413 insulation Methods 0.000 claims abstract description 55
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 239000011449 brick Substances 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 238000007666 vacuum forming Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 2
- 230000007123 defense Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 206010053615 Thermal burn Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/02—Observation or illuminating devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Special Wing (AREA)
Abstract
The invention relates to a sealed energy-saving observation door with a sight glass, which comprises an observation brick, a door frame and a door cover, wherein the door cover is clamped with the door frame, a door cover heat insulation assembly is arranged on the inner side of the door cover, a door frame heat insulation module is arranged on the inner side of the door frame, a crank assembly is hinged to the door cover up and down, the crank assembly is hinged to a connecting rod assembly, the connecting rod assembly is hinged to a second sleeve, the second sleeve is fixed on the door frame, the sight glass assembly is further arranged in the door frame, and the sight glass assembly is fixed in the door frame through. The invention reduces heat loss by arranging a plurality of heat insulation defense lines, wherein the sight glass component is used as one of the heat insulation defense lines and can be applied to a positive pressure or negative pressure heating furnace; the door closure is drawn out the door frame perpendicularly earlier, then opens completely through the upset of three activity pin joint, and this mode need not be to door closure inside lining local section cut thin, can not produce local high temperature phenomenon.
Description
Technical Field
The invention relates to the technical field of industrial heating furnace equipment, in particular to a sealed energy-saving observation door with a sight glass, which is suitable for various industrial high-temperature heating furnaces, especially ethylene cracking furnaces.
Background
The operation condition in the heating furnace needs to be observed and detected from time to time in the process of operation, detection and maintenance of the heating furnace, and the observation through the observation door is a simpler and more intuitive means except a remote transmission instrument, so the observation door becomes an indispensable component on the heating furnace.
Traditional observation door is when using, and operating personnel rotates earlier and opens observation door closure, then through observation hole direct observation stove interior condition, and open observation hole has directly communicated furnace and external environment, because heating furnace pressure is dynamic change, so scald when operating personnel is observed to the stove in by stove high temperature flue gas and arouse bodily injury easily. In addition, the open type observation hole of the traditional observation door also becomes a conduction channel of heat in the furnace, because the temperature of the installation position of the observation door is usually very high, although the observation door is covered by refractory castable serving as a heat insulation layer, the observation door is limited in structure, the heat insulation layer needs to be cut to be thin so as to avoid the opening rotation angle of the observation door, the observation door can be opened smoothly, the heat insulation layer is thicker, the door cover needs to be cut to be thinner and thinner, so that the local serious overtemperature of the outer surface of the observation door is caused, the heat loss of the heating furnace is increased, the heat efficiency of the heating furnace is reduced, and the energy.
In addition, if the door cover and the door frame are not completely sealed, high-temperature smoke can escape from gaps between the door cover and the door frame, and operators are injured.
Disclosure of Invention
The invention aims to overcome the defects and provides a sealed energy-saving observation door with a sight glass, wherein a door cover and a door frame adopt a hidden switch self-locking design, and the observation door cover and the door frame are tightly and firmly closed through a built-in column head plunger, so that the sealing effect is ensured; the heat loss is reduced by arranging the fire-viewing brick, the door frame heat insulation module, the door cover heat insulation module and the sight glass assembly with a plurality of heat insulation defensive lines; the door cover is firstly vertically pulled out of the door frame and then is completely opened by overturning through three movable hinge points, and the method does not need to locally thin the lining of the door cover and cannot generate local high temperature; the sight glass component enables the observation door to be used for a positive pressure heating furnace and a negative pressure heating furnace; meanwhile, the sight glass assembly serves as one of the heat insulation defense lines, and high-temperature smoke in the hearth can be prevented from accidentally injuring operators when the fire door is opened.
The purpose of the invention is realized as follows:
a sealed energy-saving observation door with a sight glass comprises an observation brick, a door frame and a door cover, wherein the observation brick is arranged on the inner side of the furnace wall of a heating furnace, the door frame is arranged on the outer side of the furnace wall of the heating furnace, the door cover is clamped with the door frame, a door cover heat insulation assembly is arranged on the inner side of the door cover, a door frame heat insulation module is arranged on the inner side of the door frame, and the door frame heat insulation module are fixed with the furnace wall of the heating furnace; the door cover is hinged with a crank assembly up and down, the crank assembly is hinged with a connecting rod assembly, the connecting rod assembly is hinged with a second sleeve, and the second sleeve is fixed on the door frame; and a sight glass component is also arranged in the door frame and is fixed in the door frame through screws.
Preferably, the sight glass component comprises a sight glass support, a base, a sight glass and a cover plate, the sight glass support is fixed with the door frame through screws, the sight glass support extends into the fire brick, the base is connected to the inner side of the sight glass support, and the sight glass is limited between the base and the cover plate.
Preferably, the door cover is hinged with the crank assembly through a first sleeve, a column head plunger is arranged in the first sleeve, a column head of the column head plunger extends into the door cover, a limiting groove is formed in the position, corresponding to the column head of the column head plunger, of the door frame, and the column head plunger is limited in the first sleeve through a plug screw.
Preferably, the crank assembly is connected with the connecting rod assembly through a first rotating shaft, the connecting rod assembly is connected with the second sleeves through a second rotating shaft, and the second rotating shaft is limited between the two second sleeves.
Preferably, the door cover heat insulation assembly comprises a door cover heat insulation module, and the screw penetrates out of the inner side of the door cover heat insulation module and then sequentially sleeves the fixing plate, the small heat insulation pad, the large heat insulation pad and the door cover, and the screw is fixed through the screw cap.
Preferably, the large insulating mat contacts the outer end face of the door frame in the closed state of the fire door.
Preferably, the second rotating shaft is connected with a limiting round steel, and the limiting round steel is perpendicular to the door frame when the door cover is in the fully closed position.
Preferably, the crank assembly comprises a crank, a joint and a connecting pipe, the joint is sleeved outside the first sleeve, the connecting pipe is sleeved on the first rotating shaft, the crank and the connecting pipe are welded when the door cover is in a closed state, and the connecting rod assembly and the door frame form an angle of 90 degrees.
Preferably, the fire-viewing brick, the door frame heat insulation module and the door cover heat insulation module are all formed by VF-14 type ceramic fiber vacuum forming modules.
The invention has the beneficial effects that:
1. the door cover and the door frame adopt a hidden switch self-locking design, and the fire observation door cover and the door frame are tightly and firmly closed through a built-in column head plunger, so that the sealing effect is ensured;
2. the fire brick, the door frame heat insulation module and the door cover heat insulation module are all formed by VF-14 type ceramic fiber vacuum forming blocks, so that the weight is lighter, the temperature resistance is higher, and the heat insulation effect is better, thereby reducing the heat loss;
3. the opening mode of the fire door is as follows: the door cover is firstly vertically pulled out of the door frame and then is turned over through the three movable hinge points to be completely opened, so that the method does not need to locally thin the lining of the door cover, and the phenomenon of local high temperature is avoided;
4. the detachable sight glass component is arranged, so that the application range of the heating furnace is improved, and the heating furnace can be used for a positive pressure heating furnace and a negative pressure heating furnace; meanwhile, the sight glass component can be used as a first heat insulation defense line, and high-temperature smoke in the hearth can be prevented from accidentally injuring operators when the fire door is opened.
Drawings
Fig. 1 is a front view of the sealed energy-saving observation door with the sight glass.
Fig. 2 is a left side view of fig. 1.
Fig. 3 is a partial enlarged view I of fig. 2.
Fig. 4 is a sectional view a-a of fig. 1.
Fig. 5 is an opening trace diagram of the door cover.
Fig. 6 is a view from the direction B of fig. 1 (the door is in a fully closed state).
FIG. 7 is a schematic view of a door insulating assembly.
Fig. 8 is a schematic view of the structure of the mirror assembly.
Wherein: 1, viewing a fire brick; a door frame 2; a limiting groove 2.1; a door cover 3; a first sleeve 3.1; a furnace wall 4 of the heating furnace; a door panel insulation assembly 5; a door cover heat insulation module 5.1; 5.2 parts of a screw rod; a fixed plate 5.3; a small thermal insulation pad 5.4; 5.5 of a large heat insulation pad; 5.6 of a screw cap; a door frame heat insulation module 6; a crank assembly 7; a crank 7.1; a joint 7.2; 7.3, connecting pipes; a connecting rod assembly 8; a connecting plate 8.1; a third sleeve 8.2; a fourth sleeve 8.3; a second sleeve 9; a column head plunger 10; a plug screw 11; a first rotating shaft 12; a second rotating shaft 13; limiting round steel 14; a mirror assembly 15; a mirror support 15.1; a base 15.2; 15.3 of a sight glass; a cover plate 15.4; a cushion 16; door frame insulating spacer 17.
Detailed Description
Referring to the figures 1-8, the invention relates to a sealed energy-saving observation door with a sight glass, which comprises an observation brick 1, a door frame 2 and a door cover 3, wherein the observation brick 1 is arranged on the inner side of a furnace wall 4 of a heating furnace, the door frame 2 is arranged on the outer side of the furnace wall 4 of the heating furnace, the door cover 3 is clamped with the door frame 2, a door cover heat insulation component 5 is arranged on the inner side of the door cover 3, a door frame heat insulation module 6 is arranged on the inner side of the door frame 2, and the door frame 2 and the door frame heat insulation module 6 are fixed with the furnace wall.
The door is characterized in that a first sleeve 3.1 is arranged above and below the door cover 3, the first sleeve 3.1 is hinged to a crank assembly 7, the crank assembly 7 is hinged to a connecting rod assembly 8, the connecting rod assembly 8 is hinged to a second sleeve 9, and the second sleeve 9 is fixed on the door frame 2. The crank assembly 7 is connected with the connecting rod assembly 8 through a first rotating shaft 12, the connecting rod assembly 8 is connected with the second sleeves 9 through a second rotating shaft 13, and the second rotating shaft 13 is limited between the two second sleeves 9. Realize the flexibility of door closure through three movable pin joints and open, ensure that the door closure can open completely, do not block the viewing aperture.
A column head plunger 10 is arranged in the first sleeve 3.1, a column head of the column head plunger 10 extends into the door cover 3, a limiting groove 2.1 is arranged on the door frame 2 corresponding to the column head of the column head plunger 10, and the column head plunger 10 is limited in the first sleeve 3.1 by a screw plug 11.
The door cover heat insulation assembly 5 comprises a door cover heat insulation module 5.1, a screw rod 5.2 penetrates out of the inner side of the door cover heat insulation module 5.1 to the outer side and then is sequentially sleeved with a fixing plate 5.3, a small heat insulation pad 5.4, a large heat insulation pad 5.5 and a door cover 3, the fixing is realized through a nut 5.6, the large heat insulation pad 5.5 is in contact with the outer end face of the door frame 2 in the closing state of the observation door, and a zero gap between the door cover and the door frame is ensured.
A sight glass assembly 15 is further arranged in the door frame 2, and the sight glass assembly 15 is fixed in the door frame 2 through screws. The design of the sight glass assembly 15 can play two roles, one is that the heat insulation is carried out, 30-40% of heat radiation is isolated, and the heat loss is reduced; and the device is suitable for various occasions, not only suitable for a positive pressure heating furnace, but also suitable for a negative heating furnace.
The sight glass subassembly 15 includes sight glass support 15.1, base 15.2, sight glass 15.3 and apron 15.4, sight glass support 15.1 is fixed with door frame 2 through the screw, sight glass support 15.1 stretches into in the fire brick 1, base 15.2 is connected to sight glass support 15.1 inboard, sight glass 15.3 can dismantle, and the sight glass adopts the quartz glass more than high temperature resistant 1000 ℃, and sight glass 15.3 is spacing between base 15.2 and apron 15.4, and base 15.2 passes through bolted connection with apron 15.4, be equipped with the protection pad between base 15.2 and the apron 15.4, and the material of protection pad is ceramic fiber paper. When the sight glass 15.3 is stained with smoke dust, the sight glass can be detached for cleaning.
A buffer cushion 16 is arranged between the outer end face of the sight glass support 15.1 and the door cover heat insulation module 5.1, the buffer cushion 16 is adhered to the door cover heat insulation module 5.1 through high-temperature adhesive during installation, and the buffer cushion 16 is made of ceramic fiber felt.
When the door frame heat insulation module 6 is installed in the door frame 2, a high-temperature adhesive is coated on the contact surface of the inner side of the door frame 2 and then construction is performed.
The crank component 7 comprises a crank 7.1, a connector 7.2 and a connecting pipe 7.3, the connector 7.2 is sleeved outside the first sleeve 3.1, and the connecting pipe 7.3 is sleeved on the first rotating shaft 12.
The welding of the crank 7.1 to the connecting pipe 7.3 needs to be carried out when the door cover 3 is in the closed state, i.e. the connecting rod assembly 7 is at 90 ° to the door frame 2.
The connecting rod assembly 8 comprises a connecting plate 8.1, a third sleeve 8.2 and a fourth sleeve 8.3, the third sleeve 8.2 and the fourth sleeve 8.3 are arranged on two sides of the connecting plate 8.1, the third sleeve 8.3 is sleeved with the first rotating shaft 12, the fourth sleeve 8.3 is sleeved with the second rotating shaft 13, and the connecting plate 8.1 is welded with the second rotating shaft 13.
The fire-viewing brick 1, the door frame heat insulation module 6 and the door cover heat insulation module 5.1 are all formed by VF-14 type ceramic fiber vacuum forming modules.
And a door frame heat insulation gasket 17 is also arranged between the furnace wall 4 of the heating furnace and the door frame, and when the door frame heat insulation gasket 17 is arranged outside the door frame heat insulation module, a high-temperature adhesive is coated on the contact surface of the door frame heat insulation module and the door frame.
The working principle is as follows: the door cover is pulled outwards along the direction vertical to the furnace wall, the column head of the column head plunger is separated from the limiting groove to remove self-locking, at the moment, the crank assembly rotates around the first rotating shaft, and after the door cover is vertically pulled out of the door frame, the crank assembly and the connecting rod assembly integrally rotate around the second rotating shaft until the fire observation door is completely opened.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a take energy-saving observation door of sight glass sealed which characterized in that: the fireproof door comprises fireproof bricks (1), a door frame (2) and a door cover (3), wherein the fireproof bricks (1) are arranged on the inner side of a heating furnace wall (4), the door frame (2) is arranged on the outer side of the heating furnace wall (4), the door cover (3) is clamped with the door frame (2), a door cover heat insulation component (5) is arranged on the inner side of the door cover (3), a door frame heat insulation module (6) is arranged on the inner side of the door frame (2), and the door frame (2) and the door frame heat insulation module (6) are fixed with the heating furnace wall (4) through bolts; the door cover (3) is hinged with a crank assembly (7) up and down, the crank assembly (7) is hinged with a connecting rod assembly (8), the connecting rod assembly (8) is hinged with a second sleeve (9), and the second sleeve (9) is fixed on the door frame (2); a sight glass component (15) is further arranged in the door frame (2), and the sight glass component (15) is fixed in the door frame (2) through screws.
2. The sealed energy-saving observation door with sight glass according to claim 1, wherein: the sight glass subassembly (15) includes sight glass support (15.1), base (15.2), sight glass (15.3) and apron (15.4), sight glass support (15.1) is fixed through screw and door frame (2), sight glass support (15.1) stretches into in seeing firebrick (1), base (15.2) are connected to sight glass support (15.1) inboard, and sight glass (15.3) are spacing between base (15.2) and apron (15.4).
3. The sealed energy-saving observation door with sight glass according to claim 1, wherein: the door closure (3) is hinged with the crank assembly (7) through the first sleeve (3.1), a column head plunger (10) is arranged in the first sleeve (3.1), a column head of the column head plunger (10) extends into the door closure (3), a limiting groove (2.1) is formed in the position, corresponding to the column head plunger (10), of the door frame (2), and the column head plunger (10) is limited in the first sleeve (3.1) through the screw plug (11).
4. The sealed energy-saving observation door with sight glass according to claim 1, wherein: the crank assembly (7) is connected with the connecting rod assembly (8) through a first rotating shaft (12), the connecting rod assembly (8) is connected with the second sleeve (9) through a second rotating shaft (13), and the second rotating shaft (13) is limited between the two second sleeves (9).
5. The sealed energy-saving observation door with sight glass according to claim 1, wherein: door closure heat insulating assembly (5) including door closure heat insulating module (5.1), fixed plate (5.3), little heat insulating mattress (5.4), big heat insulating mattress (5.5) and door closure (3) are cup jointed in proper order after screw rod (5.2) are worn out to the outside from door closure heat insulating module (5.1) inboard, are fixed through nut (5.6).
6. The sealed energy-saving observation door with sight glass according to claim 5, wherein: when the observation door is closed, the large heat insulation pad (5.5) is contacted with the outer end surface of the door frame (2).
7. The sealed energy-saving observation door with sight glass according to claim 4, wherein: the second rotating shaft (13) is connected with limiting round steel (14), and the limiting round steel (14) is perpendicular to the door frame (2) when the door cover is in the fully closed position.
8. The sealed energy-saving observation door with sight glass according to claim 1, wherein: crank subassembly (7) include crank (7.1), connect (7.2) and take over (7.3), connect (7.2) cover to establish outside first sleeve (3.1), take over (7.3) cover to establish on first pivot (12), crank (7.1) and the welding of taking over (7.3) need be in the closed condition in door closure (3), and link assembly (7) and door frame (2) carry out when becoming 90.
9. The sealed energy-saving observation door with sight glass according to claim 1, wherein: the fire observation brick (1), the door frame heat insulation module (6) and the door cover heat insulation module (5.1) are all formed by VF-14 type ceramic fiber vacuum forming blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110316761.8A CN112944934B (en) | 2021-03-25 | 2021-03-25 | Sealed energy-saving viewing door with viewing mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110316761.8A CN112944934B (en) | 2021-03-25 | 2021-03-25 | Sealed energy-saving viewing door with viewing mirror |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112944934A true CN112944934A (en) | 2021-06-11 |
| CN112944934B CN112944934B (en) | 2024-08-27 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110316761.8A Active CN112944934B (en) | 2021-03-25 | 2021-03-25 | Sealed energy-saving viewing door with viewing mirror |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204705195U (en) * | 2015-06-02 | 2015-10-14 | 江苏焱鑫科技股份有限公司 | Energy-saving lens type observation door |
| US20160033202A1 (en) * | 2014-07-30 | 2016-02-04 | Vareck Walla | Door Assembly for Use with a Furnace |
| CN206112987U (en) * | 2016-09-23 | 2017-04-19 | 新疆大学 | Convection heating surface who broadens one's vision and can seal observes hole |
| CN206160188U (en) * | 2016-09-23 | 2017-05-10 | 新疆大学 | Hole device is observed to furnace flame that does not leak out |
| CN212133305U (en) * | 2020-04-01 | 2020-12-11 | 天津固特节能环保科技有限公司 | Thickened type observation door |
| CN212133303U (en) * | 2020-04-01 | 2020-12-11 | 天津固特节能环保科技有限公司 | Energy-saving observation door structure of kiln |
| CN214470156U (en) * | 2021-03-25 | 2021-10-22 | 江苏焱鑫科技股份有限公司 | Sealed energy-saving observation door with sight glass |
-
2021
- 2021-03-25 CN CN202110316761.8A patent/CN112944934B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160033202A1 (en) * | 2014-07-30 | 2016-02-04 | Vareck Walla | Door Assembly for Use with a Furnace |
| CN204705195U (en) * | 2015-06-02 | 2015-10-14 | 江苏焱鑫科技股份有限公司 | Energy-saving lens type observation door |
| CN206112987U (en) * | 2016-09-23 | 2017-04-19 | 新疆大学 | Convection heating surface who broadens one's vision and can seal observes hole |
| CN206160188U (en) * | 2016-09-23 | 2017-05-10 | 新疆大学 | Hole device is observed to furnace flame that does not leak out |
| CN212133305U (en) * | 2020-04-01 | 2020-12-11 | 天津固特节能环保科技有限公司 | Thickened type observation door |
| CN212133303U (en) * | 2020-04-01 | 2020-12-11 | 天津固特节能环保科技有限公司 | Energy-saving observation door structure of kiln |
| CN214470156U (en) * | 2021-03-25 | 2021-10-22 | 江苏焱鑫科技股份有限公司 | Sealed energy-saving observation door with sight glass |
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| Publication number | Publication date |
|---|---|
| CN112944934B (en) | 2024-08-27 |
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