CN219244291U - Ignition holding furnace and gangue sintering machine comprising same - Google Patents
Ignition holding furnace and gangue sintering machine comprising same Download PDFInfo
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- CN219244291U CN219244291U CN202223220831.9U CN202223220831U CN219244291U CN 219244291 U CN219244291 U CN 219244291U CN 202223220831 U CN202223220831 U CN 202223220831U CN 219244291 U CN219244291 U CN 219244291U
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Abstract
According to the trend of materials, the ignition heat preservation furnace comprises an ignition section and a heat preservation section, and a furnace shell is covered above the ignition section and the heat preservation section. An ignition burner is arranged on the furnace shell positioned at the ignition section. And a heat-preserving burner is arranged on the furnace shell positioned at the heat-preserving section. The stove outer covering is the open-ended "" font structure in below, and the outside of stove outer covering is provided with the first fuel pipeline that is connected with the ignition nozzle and the second fuel pipeline that is connected with the heat preservation nozzle. The burner is added at the top or at the side of the heat preservation section of the ignition heat preservation furnace, the temperature of the heat preservation section is improved, the heat preservation effect is ensured, and the measures of introducing high-temperature smoke into the heat preservation section or the heat preservation extension section, adding the heat preservation extension section and the like are adopted by the hot blast stove, so that the heat preservation time of coal gangue materials is prolonged, and the heat preservation effect is ensured.
Description
Technical Field
The utility model relates to an ignition heat preservation furnace and an ignition heat preservation furnace comprising the same, in particular to an ignition heat preservation furnace for a coal gangue sintering machine, and belongs to the field of coal gangue sintering.
Background
The coal gangue is solid waste in the coal production process, the piled solid waste coal gangue in China exceeds 46 hundred million tons at the present stage, and the coal gangue is increased at the speed of about 1.6 hundred million tons/year, and is industrial solid waste with the largest discharge amount in China. The gangue not only occupies a large amount of land, pollutes water source, but also releases a large amount of harmful gas during spontaneous combustion, thereby causing the damage of ecological environment and atmospheric pollution. Therefore, the treatment and comprehensive utilization of the gangue are imperative, and the roasting decarburization is a traditional and effective treatment mode. The sintering process in ferrous metallurgy is a novel process technology and an effective method for the decarbonizing treatment of coal gangue after technical transplantation and transformation.
The ignition heat preservation furnace is throat equipment of an exhaust roasting process of a sintering machine, a high-temperature field area is established in a hearth through high-temperature flue gas generated by gas combustion, initial energy is provided for normal production of the sintering machine, solid fuel matched in a sintering mixture is ignited, and the roasting process of the mixture is started.
The ferrous metallurgy sintering ignition heat preservation furnace is divided into four main parts of a furnace front pipeline, a burner, a furnace shell steel structure and a fireproof lining according to the structure; according to the function division, the ignition heat preservation furnace is divided into an ignition furnace and a heat preservation furnace by taking the middle partition wall as a boundary. An ignition burner is arranged on the ignition furnace, fuel gas is sprayed into a hearth for combustion, a temperature field of about 1150 ℃ is formed, and the mixture is ignited; the heat preservation furnace shields cold air outside the furnace, ensures the temperature in the furnace to be about 500-600 ℃, and prevents the rapid cooling cracking of the ignited mixture.
The existing main stream sintering machine for ferrous metallurgy generally has the machine speed of 1.4-2m/min, the general total length of the ignition heat preservation furnace is 5-7m, the length of the ignition furnace is 3.5-4m (comprising a front end partition wall and a middle partition wall), and the length of the heat preservation furnace is about 2m (comprising a rear end partition wall). The furnace type is generally provided with 2-3 rows of ignition burners only at the top of an ignition furnace section, the heat preservation furnace section is not provided with burners, and the heat preservation temperature of 500-600 ℃ is mainly maintained by the combustion heat release of fixed carbon in the mixture and the radiant heat of the material surface. In addition, the height of the rear end partition wall of the ignition heat preservation furnace from the material surface is set to be 150-250mm, and the material layer in the heat preservation furnace is prevented from being lack of oxygen while cold air is controlled to enter, so that the downward movement of the calcining zone is prevented.
After the ferrous metallurgy sintering machine is transformed into the gangue sintering machine, the general running speed of the gangue sintering machine is 0.5-0.6m/min, the existing sintering ignition furnace can provide enough ignition time and ignition temperature, but the heat preservation time of the heat preservation furnace is only about 3min, the heat preservation temperature is only 500-600 ℃, the heat preservation effect is poor, and the condition that the heat preservation time is 5min at 900 ℃ required by the gangue cannot be achieved. The ignition performance of the gangue is poor, the heat preservation effect is poor, and the burning abnormality is easy to be caused, so that the calcining effect is influenced, and even the calcining process is interrupted.
Disclosure of Invention
After the ferrous metallurgy sintering machine is transformed into the gangue sintering machine, the problems that the heat preservation effect is poor, combustion is abnormal, the calcination effect is affected and even the calcination process is interrupted exist, and the ignition heat preservation furnace for the gangue sintering machine is provided.
According to a first embodiment of the present utility model, an ignition holding furnace is provided.
According to the trend of materials, the ignition heat preservation furnace comprises an ignition section and a heat preservation section, and a furnace shell is covered above the ignition section and the heat preservation section. An ignition burner is arranged on the furnace shell positioned at the ignition section. And a heat-preserving burner is arranged on the furnace shell positioned at the heat-preserving section. The stove outer covering is the open-ended "" font structure in below, and the outside of stove outer covering is provided with the first fuel pipeline that is connected with the ignition nozzle and the second fuel pipeline that is connected with the heat preservation nozzle.
Preferably, the ignition holding furnace further comprises a hot blast stove. The furnace shell of the heat preservation section is provided with a hot air port. The hot blast stove is arranged outside the stove shell, and an air outlet of the hot blast stove is connected with the hot blast opening through a hot blast conveying pipeline.
Preferably, the downstream of the heat preservation section is also provided with a heat preservation extension section, the heat preservation extension section is closely connected with the heat preservation section, and a furnace shell is also covered above the heat preservation extension section. The furnace shell of the heat preservation extension section is provided with a heat preservation burner and/or a hot air port.
Preferably, a hot blast stove burner is arranged in the hot blast stove, and the hot blast stove burner is connected with a third fuel pipeline.
Preferably, a temperature detection unit is further arranged inside the furnace shell of the heat preservation section and/or the heat preservation extension section.
Preferably, the first fuel pipeline, the second fuel pipeline and the third fuel pipeline are all provided with fuel valves.
Preferably, the hot air conveying pipeline is provided with a gas valve.
According to a second embodiment of the present utility model, there is provided a gangue sintering machine.
According to the trend of materials, the coal gangue sintering machine comprises a heating section, a roasting section, a cooling section and the ignition heat preservation furnace. The ignition holding furnace is arranged above the front section of the heating section.
Preferably, the ignition holding furnace further comprises a front end wallboard and a rear end wallboard. The front end wallboard is arranged at the forefront of the ignition holding furnace. The rear end wallboard is arranged at the rearmost part of the ignition heat preservation furnace and is connected with the top and two side walls of the furnace shell. A sintering material layer is paved on the sintering machine, the bottom edge of the rear end wallboard is positioned above the sintering material layer,
preferably, the distance between the rear end wall plate and the sintering material layer is 50-150 mm, preferably 80-120 mm.
Preferably, a partition wall is further arranged between the ignition section and the heat preservation section and between the heat preservation section and the heat preservation extension section.
Preferably, the rear end wallboard is divided into an upper section structure and a lower section structure, the upper wallboard is connected with the furnace shell, the upper wallboard is provided with a pulley, the top of the lower wallboard is provided with a hanging device, and the lower wallboard is movably connected with the upper wallboard through the pulley and the hanging device.
Preferably, the ignition holding furnace further comprises a refractory holding liner. The fireproof heat-insulating lining is arranged below the top of the furnace shell.
Preferably, the ignition burner and the thermal insulation burner are arranged on the top and the side wall of the furnace shell, and combustion flames of the ignition burner and the thermal insulation burner are positioned between the fireproof thermal insulation lining and the upper surface of the sintering material layer.
According to the utility model, on the basis of the existing ignition heat preservation furnace, a heat preservation burner is arranged in the furnace shell of the heat preservation section of the ignition heat preservation furnace and is connected with a second fuel pipeline, the temperature of the heat preservation section is increased through fuel combustion, meanwhile, a hot blast stove can be arranged outside the ignition heat preservation furnace, and high-temperature flue gas is selectively introduced into the ignition heat preservation furnace through a hot blast opening on the furnace shell of the heat preservation section.
In the utility model, a heat preservation extension section is arranged at the downstream of the heat preservation section, and a hot air port and/or a heat preservation burner nozzle are arranged on a furnace shell of the heat preservation extension section. The heat preservation extension section is arranged, the temperature of the heat preservation extension section is maintained, the heat preservation time can be improved under the condition that the running speed of the gangue sintering machine is unchanged, and the heat preservation effect is ensured.
In the utility model, a temperature detection unit is arranged in the furnace shell of the heat preservation section and/or the heat preservation extension section, a fuel valve is arranged on the second fuel pipeline, and a gas valve is arranged on the hot air conveying pipeline. And adjusting the opening of the fuel valve and the gas valve according to the temperature in the heat preservation section and/or the heat preservation extension section furnace shell measured by the temperature detection unit, and maintaining the temperature of the heat preservation section and/or the heat preservation extension section within a reasonable range. In addition, a fuel valve is arranged on the third fuel pipeline to control the temperature inside the hot blast stove, and further control the temperature of the heat preservation section and/or the heat preservation extension section.
In the utility model, the fire-resistant heat-insulating lining is arranged in the ignition heat-insulating furnace to maintain the temperature in the ignition heat-insulating furnace, the fire-resistant heat-insulating lining is arranged at the top and the side part of the furnace shell to provide combustion space for the flame of the ignition burner and the heat-insulating burner, so that the flame is prevented from directly flushing the fire-resistant heat-insulating lining to ensure the service life of the fire-resistant heat-insulating lining, and in addition, the flame of the heat-insulating burner is kept at a certain distance from the sintering material surface to avoid excessive sintering of the material caused by directly burning the material surface.
In the utility model, the height of the bottom edge of the rear end wallboard from the material surface is set to be 50-150 mm, and the material layer in the heat preservation furnace is prevented from being lack of oxygen while cold air is controlled to enter, so that the downward movement of the calcining zone is prevented. Preferably, the height of the bottom edge of the rear end wallboard from the material surface can be adjusted in real time according to the working conditions of the material layer thickness, the temperature in the heat preservation section and the heat preservation extension section, the oxygen concentration in the ignition heat preservation furnace and the like, so that the temperature in the heat preservation section and the heat preservation extension section after the opening of the fuel valve and the gas valve are adjusted is ensured to be in a reasonable range, the heat preservation effect is ensured, and the overflow of smoke generated after the combustion of the burner is avoided, and the adverse effect on the environment is avoided.
In the present utility model, not all of the first fuel line, the second fuel line, the third fuel line, the hot blast stove burner, and the hot blast delivery line are shown in the drawings.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the ignition heat preservation furnace for the gangue sintering machine, provided by the utility model, the burner is added in the heat preservation section, the temperature of the heat preservation section is increased, the heat preservation effect is ensured, and the measures of introducing high-temperature smoke into the heat preservation section, adding the heat preservation extension section and the like are adopted, so that the heat preservation time of gangue materials is prolonged, and the heat preservation effect is ensured.
2. The ignition heat preservation furnace for the coal gangue sintering machine can control the fuel valve and the gas valve according to the temperature in the heat preservation section and the heat preservation extension section, change the height of the bottom edge of the rear end wallboard from the material surface, enable the temperature in the heat preservation section and the heat preservation extension section to be in a reasonable range, and avoid the overflow of flue gas generated after burning of the burner, thereby causing adverse effect on the environment.
Drawings
Fig. 1 is a schematic structural view of an ignition holding furnace for a gangue sintering machine.
Fig. 2 is a sectional view of an ignition holding furnace for a gangue sintering machine.
FIG. 3 is a diagram of the connection relationship of a hot air furnace in the gangue sintering machine.
Fig. 4 is a schematic structural view of a rear end wallboard used in a gangue sintering machine.
Reference numerals: 1: an ignition section; 2: a heat preservation section; 3: a furnace shell; 301: a hot air port; 4: igniting a burner; 5: heat preservation burner; 6: hot blast stove; 7: a heat preservation extension section; 8: a fuel valve; 9: a gas valve; 10: a front end wall plate; 11: a rear end wall panel; 1101: a wall board is arranged; 1102: a lower wallboard; 12: partition walls; 13: a refractory insulation lining; 14: a hot blast stove burner; l1: a first fuel conduit; l2: a second fuel conduit; a third fuel line; g1: a hot air delivery duct; a: a sintering machine; a1: a heating section; a2: a roasting section; a3: and (5) a cooling section.
Detailed Description
The following examples illustrate the technical aspects of the utility model, and the scope of the utility model claimed includes but is not limited to the following examples.
According to a first embodiment of the present utility model, an ignition holding furnace is provided.
According to the trend of materials, the ignition heat preservation furnace comprises an ignition section 1 and a heat preservation section 2, and a furnace shell 3 is covered above the ignition section 1 and the heat preservation section 2. An ignition burner 4 is arranged on the furnace shell 3 of the ignition section 1. A heat preservation burner 5 is arranged on the furnace shell 3 positioned on the heat preservation section 2. The furnace shell 3 is of a -shaped structure with an opening at the lower part, and a first fuel pipeline L1 connected with the ignition burner 4 and a second fuel pipeline L2 connected with the heat preservation burner 5 are arranged outside the furnace shell 3.
Preferably, the ignition holding furnace further comprises a hot blast stove 6. A hot air port 301 is arranged on the furnace shell 3 of the heat preservation section 2. The hot blast stove 6 is arranged outside the stove shell 3, and an air outlet of the hot blast stove 6 is connected with the hot blast opening 301 through a hot blast conveying pipeline G1.
Preferably, the downstream of the heat preservation section 2 is also provided with a heat preservation extension section 7, the heat preservation extension section 7 is tightly connected with the heat preservation section 2, and a furnace shell 3 is also covered above the heat preservation extension section 7. The furnace shell 3 of the heat preservation extension section 7 is provided with a heat preservation burner 5 and/or a hot air port 301.
Preferably, a hot blast stove burner 14 is arranged in the hot blast stove 6, and the hot blast stove burner 14 is connected with the third fuel pipeline L3.
Preferably, a temperature detection unit is further arranged inside the furnace shell 3 of the heat preservation section 2 and/or the heat preservation extension section 7.
Preferably, the first fuel pipeline L1, the second fuel pipeline L2, and the third fuel pipeline L3 are each provided with a fuel valve 8.
Preferably, the hot air delivery pipe G1 is provided with a gas valve 9.
According to a second embodiment of the present utility model, there is provided a gangue sintering machine.
According to the trend of materials, the sintering machine A comprises a heating section A1, a roasting section A2, a cooling section A3 and the ignition heat preservation furnace. The ignition holding furnace is arranged above the front section of the heating section A1.
Preferably, the ignition holding furnace further comprises a front end wall plate 10 and a rear end wall plate 11. The front end wall plate 10 is disposed at the forefront of the ignition holding furnace. The rear end wall plate 11 is arranged at the rearmost part of the ignition holding furnace and is connected with the top and two side walls of the furnace shell 3. A sintering material layer is paved on the sintering machine A, the bottom edge of the rear end wallboard 11 is positioned above the sintering material layer,
preferably, the distance between the rear end wall plate 11 and the sinter bed is 50-150 mm, preferably 80-120 mm.
Preferably, a partition wall 12 is also arranged between the ignition section 1 and the heat preservation section 2 and between the heat preservation section 2 and the heat preservation extension section 7.
Preferably, the rear end wall plate 11 is divided into an upper section and a lower section, the upper wall plate 1101 is connected with the furnace shell 3, a pulley is arranged on the upper wall plate 1101, a hanging device is arranged at the top of the lower wall plate 1102, and the lower wall plate 1102 is movably connected with the upper wall plate 1101 through the pulley and the hanging device.
Preferably, the ignition holding furnace further comprises a refractory holding liner 13. A refractory insulating lining 13 is provided below the top of the furnace shell 3.
Preferably, the ignition burner 4 and the thermal insulation burner 5 are arranged on the top and the side wall of the furnace shell 3, and the combustion flame is positioned between the fireproof thermal insulation lining 13 and the upper surface of the sintering material layer.
Example 1
According to the trend of materials, the ignition heat preservation furnace comprises an ignition section 1 and a heat preservation section 2, and a furnace shell 3 is covered above the ignition section 1 and the heat preservation section 2. An ignition burner 4 is arranged on the furnace shell 3 of the ignition section 1. A heat preservation burner 5 is arranged on the furnace shell 3 positioned on the heat preservation section 2. The furnace shell 3 is of a -shaped structure with an opening at the lower part, and a first fuel pipeline L1 connected with the ignition burner 4 and a second fuel pipeline L2 connected with the heat preservation burner 5 are arranged outside the furnace shell 3.
Example 2
Example 1 is repeated except that the ignition holding furnace further comprises a hot blast stove 6. A hot air port 301 is arranged on the furnace shell 3 of the heat preservation section 2. The hot blast stove 6 is arranged outside the stove shell 3, and an air outlet of the hot blast stove 6 is connected with the hot blast opening 301 through a hot blast conveying pipeline G1.
Example 3
The embodiment 2 is repeated, except that a heat preservation extension section 7 is further arranged at the downstream of the heat preservation section 2, the heat preservation extension section 7 is tightly connected with the heat preservation section 2, and a furnace shell 3 is also covered above the heat preservation extension section 7. The furnace shell 3 of the heat preservation extension section 7 is provided with a heat preservation burner 5 and a hot air port 301.
Example 4
Example 3 is repeated except that a stove burner 14 is arranged inside the stove 6, the stove burner 14 being connected to the third fuel line L3.
Example 5
Example 4 was repeated except that the inside of the furnace shell 3 of the heat-insulating section 2 and the heat-insulating extension section 7 was also provided with a temperature detection unit.
Example 6
Example 5 is repeated except that the first fuel line L1, the second fuel line L2, and the third fuel line L3 are each provided with a fuel valve 8.
The hot air conveying pipeline G1 is provided with a gas valve 9.
Example 7
According to the trend of materials, the sintering machine A comprises a heating section A1, a roasting section A2, a cooling section A3 and the ignition heat preservation furnace described in the embodiment 6. The ignition holding furnace is arranged above the front section of the heating section A1.
Example 8
Example 7 was repeated except that the ignition holding furnace further included a front end wall plate 10 and a rear end wall plate 11. The front end wall plate 10 is disposed at the forefront of the ignition holding furnace. The rear end wall plate 11 is arranged at the rearmost part of the ignition holding furnace and is connected with the top and two side walls of the furnace shell 3. A sintering material layer is paved on the sintering machine A, the bottom edge of the rear end wallboard 11 is positioned above the sintering material layer,
example 9
Example 8 was repeated except that the rear end wall panel 11 was spaced 100mm from the frit layer.
Example 10
Example 9 was repeated except that a partition wall 12 was further provided between the ignition section 1 and the heat-insulating section 2, and between the heat-insulating section 2 and the heat-insulating extension section 7.
Example 11
Example 12
Example 11 is repeated except that the ignition holding furnace further includes a refractory holding liner 13. A refractory insulating lining 13 is provided below the top of the furnace shell 3.
Example 13
Example 12 was repeated except that the ignition burner 4 and the holding burner 5 were provided on the top and side walls of the furnace shell 3 with the combustion flame between the refractory holding liner 13 and the upper surface of the sinter bed.
Claims (14)
1. An ignition holding furnace, characterized in that: according to the trend of the materials, the ignition heat preservation furnace comprises an ignition section (1) and a heat preservation section (2), and a furnace shell (3) is covered above the ignition section (1) and the heat preservation section (2); an ignition burner (4) is arranged on the furnace shell (3) of the ignition section (1); a heat-preserving burner (5) is arranged on the furnace shell (3) of the heat-preserving section (2); the furnace shell (3) is of a -shaped structure with an opening at the lower part, and a first fuel pipeline (L1) connected with the ignition burner (4) and a second fuel pipeline (L2) connected with the heat preservation burner (5) are arranged outside the furnace shell (3).
2. The ignition hold furnace of claim 1, wherein: the ignition heat preservation furnace also comprises a hot blast stove (6); a hot air port (301) is arranged on the furnace shell (3) of the heat preservation section (2); the hot blast stove (6) is arranged outside the stove shell (3), and an air outlet of the hot blast stove (6) is connected with the hot blast opening (301) through a hot blast conveying pipeline (G1).
3. The ignition hold furnace of claim 2, wherein: the downstream of the heat preservation section (2) is also provided with a heat preservation extension section (7), the heat preservation extension section (7) is tightly connected with the heat preservation section (2), and a furnace shell (3) is also covered above the heat preservation extension section (7); the furnace shell (3) of the heat preservation extension section (7) is provided with a heat preservation burner (5) and/or a hot air port (301).
4. A fire holding furnace according to claim 3, characterized in that: a hot blast stove burner (14) is arranged in the hot blast stove (6), and the hot blast stove burner (14) is connected with a third fuel pipeline (L3).
5. The ignition hold furnace of claim 4, wherein: the inside of the furnace shell (3) of the heat preservation section (2) and/or the heat preservation extension section (7) is also provided with a temperature detection unit.
6. The ignition hold furnace of claim 5, wherein: the first fuel pipeline (L1), the second fuel pipeline (L2) and the third fuel pipeline (L3) are respectively provided with a fuel valve (8); and/or
The hot air conveying pipeline (G1) is provided with a gas valve (9).
7. The utility model provides a gangue sintering machine which characterized in that: according to the trend of the materials, the sintering machine (A) comprises a heating section (A1), a roasting section (A2), a cooling section (A3) and an ignition heat preservation furnace as set forth in any one of claims 1-6; the ignition holding furnace is arranged above the front section of the heating section (A1).
8. The gangue sintering machine as claimed in claim 7, wherein: the ignition heat preservation furnace further comprises a front end wallboard (10) and a rear end wallboard (11); the front end wallboard (10) is arranged at the forefront of the ignition heat preservation furnace; the rear end wallboard (11) is arranged at the rearmost part of the ignition heat preservation furnace and is connected with the top and two side walls of the furnace shell (3); the sintering machine (A) is paved with a sintering material layer, and the bottom edge of the rear end wallboard (11) is positioned above the sintering material layer.
9. The gangue sintering machine as claimed in claim 8, wherein: the distance between the rear end wallboard (11) and the sintering material layer is 50-150 mm.
10. The gangue sintering machine as claimed in claim 9, wherein: the distance between the rear end wallboard (11) and the sintering material layer is 80-120 mm.
11. The gangue sintering machine as claimed in claim 8, wherein: a partition wall (12) is also arranged between the ignition section (1) and the heat preservation section (2) and between the heat preservation section (2) and the heat preservation extension section (7).
12. The gangue sintering machine as claimed in claim 11, wherein: the rear end wallboard (11) is divided into an upper section structure and a lower section structure, an upper wallboard (1101) is connected with the furnace shell (3), a pulley is arranged on the upper wallboard (1101), a hanging device is arranged at the top of a lower wallboard (1102), and the lower wallboard (1102) is movably connected with the upper wallboard (1101) through the pulley and the hanging device.
13. The gangue sintering machine as claimed in claim 12 wherein: the ignition holding furnace also comprises a fireproof holding liner (13); the fireproof heat-insulating lining (13) is arranged below the top of the furnace shell (3).
14. The gangue sintering machine as claimed in claim 13 wherein: the ignition burner (4) and the heat preservation burner (5) are arranged on the top and the side wall of the furnace shell (3), and combustion flame is positioned between the fireproof heat preservation lining (13) and the upper surface of the sintering material layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223220831.9U CN219244291U (en) | 2022-12-01 | 2022-12-01 | Ignition holding furnace and gangue sintering machine comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223220831.9U CN219244291U (en) | 2022-12-01 | 2022-12-01 | Ignition holding furnace and gangue sintering machine comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219244291U true CN219244291U (en) | 2023-06-23 |
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ID=86849523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223220831.9U Active CN219244291U (en) | 2022-12-01 | 2022-12-01 | Ignition holding furnace and gangue sintering machine comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219244291U (en) |
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2022
- 2022-12-01 CN CN202223220831.9U patent/CN219244291U/en active Active
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