CN220003429U - Dust removal pretreatment mechanism for sintering machine and flue gas bag type dust removal system - Google Patents
Dust removal pretreatment mechanism for sintering machine and flue gas bag type dust removal system Download PDFInfo
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- CN220003429U CN220003429U CN202320516841.2U CN202320516841U CN220003429U CN 220003429 U CN220003429 U CN 220003429U CN 202320516841 U CN202320516841 U CN 202320516841U CN 220003429 U CN220003429 U CN 220003429U
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- dust removal
- dust removing
- dust
- sintering machine
- rotary
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- 239000000428 dust Substances 0.000 title claims abstract description 157
- 230000007246 mechanism Effects 0.000 title claims abstract description 51
- 238000005245 sintering Methods 0.000 title claims abstract description 45
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000003546 flue gas Substances 0.000 title claims abstract description 26
- 238000007599 discharging Methods 0.000 claims 1
- 239000000779 smoke Substances 0.000 abstract description 20
- 239000004744 fabric Substances 0.000 abstract description 6
- 238000000746 purification Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 230000009471 action Effects 0.000 description 7
- 239000003517 fume Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 6
- 230000003116 impacting effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 210000005056 cell body Anatomy 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Abstract
The utility model discloses a dust removal pretreatment mechanism for a sintering machine and a flue gas bag type dust removal system, which comprise an air inlet pipeline, an air outlet pipeline, a rotary cone, a rotary driving mechanism, a dust removal filter cover, a dust collection groove body and a dust removal frame body with a hollow cavity, wherein a mounting frame is arranged at the bottom opening position of the dust removal frame body, the rotary cone and the dust removal filter cover are both arranged in the hollow cavity, the dust removal filter cover is arranged outside the rotary cone body, a discharge gap is reserved between the dust removal filter cover and the inner wall surface of the dust removal frame body, the fixed end of the rotary driving mechanism is arranged on the mounting frame, the driving end of the rotary driving mechanism is connected with the rotary cone body, the rotary cone body is vertically arranged, the large diameter end of the rotary cone body faces the rotary driving mechanism, and a spiral diversion trench is concavely arranged on the circumferential outer wall surface of the rotary cone body. The dust removing pretreatment mechanism for the sintering machine solves the problem that a cloth bag is easy to burn through by sparks in smoke when the existing sintering machine head uses a bag type dust remover for purification.
Description
Technical Field
The utility model relates to the technical field of sintering machines, in particular to a dust removal pretreatment mechanism for a sintering machine and a flue gas bag type dust removal system for the sintering machine.
Background
Sintering is a fundamental link of the iron and steel industry, and provides a high-quality raw material for iron making. The sintering process is to distribute the iron-containing raw materials to a sintering trolley after batching, mixing and granulating, and finally roasting the materials at a high temperature (less than or equal to 1400 ℃) after the air draft function in the constant-speed operation process of a sintering machine, so that the materials undergo a series of physical and chemical changes, and the materials are crushed to form porous blocky sintered finished ore with certain strength.
In the prior art, a bag type dust collector is used for dedusting and purifying the flue gas of a sintering machine head, but the problem that a cloth bag is easy to burn through by sparks in the flue gas exists when the sintering machine head is purified by the bag type dust collector.
Disclosure of Invention
The dust removal pretreatment mechanism for the sintering machine and the flue gas bag type dust removal system provided by the utility model solve the problem that a cloth bag is easy to burn through by sparks in flue gas when the existing sintering machine head uses a bag type dust remover for purification.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a dust removal pretreatment mechanism for sintering machine, including air intake duct, exhaust duct, rotatory cone, rotary driving mechanism, the dust removal filter mantle, dust collection cell body and the dust removal framework that has the cavity, the bottom open position department of dust removal framework is equipped with the mounting bracket, rotatory cone and dust removal filter mantle are all located in the cavity, the dust removal filter mantle is located outside the rotatory cone, leave the discharge clearance between the internal face of dust removal filter mantle and dust removal framework, rotary driving mechanism's stiff end is located on the mounting bracket, rotary driving mechanism's drive end is connected with rotatory cone, rotatory cone is along vertical setting and rotatory cone's big footpath end towards rotary driving mechanism layout, rotatory cone's circumference outer wall face indent is equipped with spiral guiding gutter, dust collection cell body locates the bottom of dust removal framework, air intake duct passes the lateral wall face of dust removal framework and dust removal filter mantle and towards rotary cone setting, exhaust duct locates on the dust removal framework and with cavity intercommunication setting, exhaust duct locates air intake duct's top.
Further, the circumferential outer wall surface of the rotary cone is convexly provided with protruding blocks, and the protruding blocks and the spiral diversion trenches are distributed in a staggered mode.
Further, the exhaust pipeline comprises a first exhaust pipeline and a second exhaust pipeline, the first exhaust pipeline is arranged on the top surface of the dust removal frame body and is communicated with the hollow cavity, the second exhaust pipeline is arranged on the side wall surface of the dust removal frame body and is communicated with the hollow cavity, and the second exhaust pipeline is arranged above the air inlet pipeline.
Further, the device also comprises an initial temperature monitor, wherein the temperature monitor is arranged on the air inlet pipeline.
Further, the filter diameter of the filter hole of the dust removing filter cover is not more than 1 millimeter.
Further, the dust removing device also comprises a hot air guide pipe, wherein the hot air guide pipe is arranged close to the bottom of the dust removing frame body.
Further, the air conditioner also comprises a cold air guide pipe, wherein the cold air guide pipe is arranged on the air inlet pipeline and is positioned at the downstream of the temperature monitor.
Further, the system also comprises an initial spark detector, wherein the initial spark detector is arranged on the air inlet pipeline and is positioned at the downstream of the temperature monitor.
Further, the dust removing frame body is a cylindrical barrel body, and the exhaust pipeline, the rotary cone, the dust removing filter cover and the dust removing frame body are coaxially arranged.
The utility model also provides a flue gas bag type dust removal system which comprises the bag type dust remover and the dust removal pretreatment mechanism for the sintering machine, wherein the bag type dust remover is positioned at the downstream of the dust removal pretreatment mechanism for the sintering machine.
The utility model also provides a device.
The utility model has the following beneficial effects:
the utility model relates to a dust removing pretreatment mechanism for a sintering machine, which comprises an air inlet pipeline, an air outlet pipeline, a rotary cone, a rotary driving mechanism, a dust removing filter cover, an ash collecting groove body and a dust removing frame body, wherein the dust removing filter cover is arranged outside the rotary cone; introducing the machine head smoke into the hollow cavity from the bottom of the dust removing frame body through an air inlet pipeline, and driving a rotary cone to rotate in the hollow cavity through a mounting frame of a rotary driving mechanism, wherein when the machine head smoke is impacted on the rotary cone under the guiding action of the air inlet pipeline, large particle dust (mainly iron ore powder and return ore) in the machine head smoke directly falls into an ash collecting groove body after impacting on the surface of the rotary cone, and meanwhile, unburned sparks can be extinguished rapidly after impacting on the rotary cone; the rotary driving mechanism drives the rotary cone to rotate, and upward rotational flow vortex force is generated in the hollow cavity under the action of the spiral diversion trench, so that the machine head smoke forms rotational flow, small particle dust in the machine head smoke passes through the dust removal filter cover under the action of centrifugal force and then falls into the dust collection tank body, and the primary purification treatment of the machine head smoke is realized.
In addition to the objects, features and advantages described above, the present utility model has other objects, features and advantages. The present utility model will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
FIG. 1 is a schematic view showing the structure of a dust removing pretreatment mechanism for a sintering machine in one embodiment of the present utility model;
fig. 2 is a schematic structural view of the rotary cone of fig. 1.
Reference numerals illustrate:
20. a dust removal pretreatment mechanism for a sintering machine; 201. a discharge gap; 21. an air intake duct; 22. an exhaust duct; 221. a first discharge conduit; 222. a second discharge conduit; 23. a rotating cone; 231. spiral diversion trenches; 232. a bump; 24. a rotary driving mechanism; 25. a dust removal filter cover; 26. an ash collecting groove body; 27. a dust removal frame; 271. a hollow cavity; 28. a hot air guide pipe; 291. an initial temperature monitor; 292. a cold air guide pipe is included; 293. an initial spark detector.
Detailed Description
It should be understood that the detailed description and specific examples, while indicating the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model.
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
The existing sintering machine head flue gas bag type dust removing system is characterized in that flue gas in an air box of a sintering machine is collected into a large flue under the action of an exhaust fan, and then is sequentially subjected to dust removal by a bag type dust remover, desulfurization by a flue gas desulfurization device and discharge by a chimney after passing through the flue gas device.
The research shows that the existing sintering machine head flue gas bag type dust removal system mainly has the following technical problems: 1. when the existing sintering flue gas is dedusted by a belt type deduster, the cloth bag is easy to burn through by sparks in the flue gas; 2. the low-temperature corrosion of the cloth bag is easily caused by the condensation of the sintering flue gas; 3. the temperature fluctuation of sintering flue gas is large, the dust removal efficiency of the bag type dust collector is affected, and the problem that a cloth bag catches fire easily occurs when the temperature of the sintering flue gas is too high; 4. the existing sintering flue gas bag type dust removal system has the problems of large flue gas treatment capacity, high energy consumption and insufficient utilization of waste heat in flue gas.
As shown in fig. 1 and 2, the utility model provides a dust removal pretreatment mechanism 20 for a sintering machine, which comprises an air inlet pipeline 21, an air outlet pipeline 22, a rotary cone 23, a rotary driving mechanism 24, a dust removal filter cover 25, a dust collection groove 26 and a dust collection frame 27 with a hollow cavity 271, wherein a mounting frame is arranged at the bottom opening position of the dust collection frame 27, the rotary cone 23 and the dust removal filter cover 25 are both arranged in the hollow cavity 271, the dust removal filter cover 25 is covered outside the rotary cone 23, a discharge gap 201 is reserved between the dust removal filter cover 25 and the inner wall surface of the dust collection frame 27, the fixed end of the rotary driving mechanism 24 is arranged on the mounting frame, the driving end of the rotary driving mechanism 24 is connected with the rotary cone 23, the rotary cone 23 is arranged vertically, the large diameter end of the rotary cone 23 faces the rotary driving mechanism 24, a spiral guide groove 231 is concavely arranged on the circumferential outer wall surface of the rotary cone 23, the dust collection groove 26 is arranged at the bottom of the dust collection frame 27, the air inlet pipeline 21 passes through the side wall surface of the dust collection frame 27 and the side wall surface of the dust collection filter cover 25 and is arranged towards the rotary cone 23, the air outlet pipeline 22 is arranged on the dust collection frame 27 and is communicated with the hollow cavity 21, and the air inlet pipeline 21 is arranged above the air inlet pipeline 21.
The utility model provides a dust removal pretreatment mechanism 20 for a sintering machine, which comprises an air inlet pipeline 21, an air outlet pipeline 22, a rotary cone 23, a rotary driving mechanism 24, a dust removal filter cover 25, an ash collection groove 26 and a dust removal frame 27, wherein the dust removal filter cover 25 is covered outside the rotary cone 23, the dust removal frame 27 is covered outside the dust removal filter cover 25, and a discharge gap 201 is reserved between the dust removal filter cover 25 and the inner wall surface of the dust removal frame 27; introducing the nose smoke into the hollow cavity 271 from the bottom of the dust removing frame 27 through the air inlet pipeline 21, driving the rotary cone 23 to rotate in the hollow cavity 271 through the rotary driving mechanism 24 arranged on the mounting frame, and when the nose smoke is impacted on the rotary cone 23 under the guiding action of the air inlet pipeline 21, large particle dust (mainly iron ore powder and return ore) in the nose smoke directly falls into the dust collecting groove 26 after impacting on the surface of the rotary cone 23, and meanwhile, the spark which is not burnt out can be quickly extinguished after impacting on the rotary cone 23; the rotary driving mechanism 24 drives the rotary cone 23 to rotate, and the upward rotational flow vortex force is generated in the hollow cavity 271 under the action of the spiral diversion trench 231, so that the machine head smoke forms rotational flow, and small particle dust in the machine head smoke falls into the dust collection groove 26 after passing through the dust removal filter cover 25 under the action of centrifugal force, so that the primary purification treatment of the machine head smoke is realized.
It will be appreciated that the rotary drive mechanism 24 may be a rotary drive motor and the ash collection trough 26 may be an ash collection hopper with an ash discharge valve at the bottom. In the utility model, the ash collecting groove 26 is used for sealing the bottom opening, and then the ash falling from the hollow cavity 271 is received by the ash collecting groove 26; large particle dust slides into the dust collection groove 26 from the side direction of the rotary cone 23, and small particle dust falls into the dust collection groove 26 from the side direction of the dust removal filter cover 25. Optionally, the mounting frame is provided at the bottom opening position of the dust removing frame 27, and the rotary cone 23 is provided on the mounting frame.
It will be appreciated that the dust filter cover 25 has filter holes, the pore diameters of which are set according to the actual situation. Specifically, the dust-removing filter cover 25 includes a truncated cone section and a cylindrical section that are connected to each other, and the cylindrical section is covered outside the rotary cone 23. Optionally, the spiral diversion trench 231 is an upward-spinning spiral trench.
Further, the circumferential outer wall surface of the rotary cone 23 is convexly provided with a bump 232, and the bump 232 and the spiral diversion trench 231 are distributed in a dislocation manner. In a specific operation, large particle dust (mainly iron ore powder and return ore) in the machine head flue gas is impacted on the lug 232 and then falls into the dust collecting tank 26; the rotary cone 23 rotates to form a rotational flow on the nose smoke. Alternatively, the shape of the bump 232 may be rectangular, triangular or other polygonal shape.
Further, the exhaust duct 22 includes a first exhaust duct 221 and a second exhaust duct 222, the first exhaust duct 221 is provided on the top surface of the dust removal frame 27 and communicates with the hollow cavity 271, the second exhaust duct 222 is provided on the side wall surface of the dust removal frame 27 and communicates with the hollow cavity 271, and the second exhaust duct 222 is provided above the intake duct 21. Specifically, the first discharge duct 221 is provided on the top surface of the dust removing frame 27, and the second discharge duct 222 is provided near the top of the dust removing frame 27. It will be appreciated that in the present utility model, the handpiece fume can be exhausted through either the first exhaust conduit 221 or the second exhaust conduit 222 depending on the spark condition and the fume temperature condition of the handpiece fume within the hollow cavity 271. Specifically, a dust collector body is provided downstream of the first discharge pipe, and a spark extinguishing device is provided downstream of the second discharge pipe 222. Optionally, control valves are provided on the first discharge pipe 221 and the second discharge pipe 222, respectively.
Further, an initial temperature monitor 291 is included, which is provided on the intake duct 21. By providing a temperature detector, it is convenient to monitor the temperature of the flue gas entering the hollow cavity 271.
Further, the dust removing device also comprises a hot air guide pipe 28, wherein the hot air guide pipe 28 is arranged close to the bottom of the dust removing frame 27. By arranging the hot air guide pipe 28, high-temperature smoke is introduced when the temperature of the machine head smoke entering the hollow cavity 271 is too low, so that the temperature of the smoke in the hollow cavity 271 is conveniently increased. Alternatively, in the present utility model, the hot air guide duct 28 is provided near the bottom of the dust removing frame 27, and the hot air guide duct 28 is provided opposite to the air intake duct 21.
Further, the filter diameter of the filter holes of the dust removing filter cover 25 is not more than 1 mm.
Further, a cold air guide pipe 292 is further included, and the cold air guide pipe is disposed on the air inlet pipe 21 and is downstream of the temperature monitor. By arranging the cold air guide pipe, low-temperature smoke is introduced when the temperature of the smoke entering the machine head in the hollow cavity 271 is too high, so that the temperature of the smoke in the hollow cavity 271 is conveniently reduced.
Further, an initial spark detector 293 is included, the initial spark detector 293 being provided on the intake duct 21 downstream of the temperature monitor. As can be appreciated, in the present utility model, when the fume spark satisfies the preset condition, the fume in the hollow cavity 271 is discharged through the first discharge duct, and when the fume spark does not satisfy the preset condition, the fume in the hollow cavity 271 is discharged through the second discharge duct.
Further, in order to secure dust removal efficiency, the dust removal frame 27 is a cylindrical cylinder, and the exhaust duct 22, the rotary cone 23, the dust removal filter cover 25, and the dust removal frame 27 are coaxially arranged.
The utility model also provides a flue gas bag type dust removal system, which comprises a bag type dust remover and the dust removal pretreatment mechanism 20 for the sintering machine, wherein the bag type dust remover is positioned at the downstream of the dust removal pretreatment mechanism 20 for the sintering machine.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. A dust removal pretreatment mechanism for a sintering machine is characterized in that,
comprises an air inlet pipeline, an air outlet pipeline, a rotary cone, a rotary driving mechanism, a dust removing filter cover, an ash collecting groove body and a dust removing frame body with a hollow cavity, wherein a mounting rack is arranged at the bottom opening position of the dust removing frame body, the rotary cone and the dust removing filter cover are both arranged in the hollow cavity, the dust removing filter cover is arranged outside the rotary cone, a discharging gap is reserved between the dust removing filter cover and the inner wall surface of the dust removing frame body,
the fixed end of the rotary driving mechanism is arranged on the mounting frame, the driving end of the rotary driving mechanism is connected with the rotary cone, the rotary cone is vertically arranged, the large diameter end of the rotary cone is arranged towards the rotary driving mechanism, the circumferential outer wall surface of the rotary cone is concavely provided with a spiral diversion trench,
the dust collecting groove body is arranged at the bottom of the dust removing frame body, the air inlet pipeline penetrates through the side wall surface of the dust removing frame body and the side wall surface of the dust removing filter cover and faces the rotary cone, the air outlet pipeline is arranged on the dust removing frame body and communicated with the hollow cavity, and the air outlet pipeline is arranged above the air inlet pipeline.
2. The dust removing pretreatment mechanism for sintering machine according to claim 1, wherein,
the circumference outer wall surface of the rotary cone is convexly provided with protruding blocks, and the protruding blocks and the spiral diversion trenches are distributed in a staggered mode.
3. The dust removing pretreatment mechanism for sintering machine according to claim 1, wherein,
the exhaust pipeline comprises a first exhaust pipeline and a second exhaust pipeline, the first exhaust pipeline is arranged on the top surface of the dust removing frame body and is communicated with the hollow cavity, the second exhaust pipeline is arranged on the side wall surface of the dust removing frame body and is communicated with the hollow cavity, and the second exhaust pipeline is arranged above the air inlet pipeline.
4. The dust removing pretreatment mechanism for sintering machine according to claim 1, wherein,
the device also comprises an initial temperature monitor, wherein the temperature monitor is arranged on the air inlet pipeline.
5. The dust removing pretreatment mechanism for sintering machine according to claim 1, wherein,
the filter diameter of the filter hole of the dust removing filter cover is not more than 1 millimeter.
6. The dust removing pretreatment mechanism for a sintering machine according to any of the claim 1 to 5, wherein,
the dust removal device also comprises a hot air guide pipe, wherein the hot air guide pipe is arranged close to the bottom of the dust removal frame body.
7. The dust removing pretreatment mechanism for sintering machine according to claim 6, wherein,
still include cold wind guide duct, cold wind guide duct locates on the admission line and is in the low reaches of temperature monitor.
8. The dust removing pretreatment mechanism for sintering machine according to claim 6, wherein,
the system also comprises an initial spark detector, wherein the initial spark detector is arranged on the air inlet pipeline and is positioned at the downstream of the temperature monitor.
9. The dust removing pretreatment mechanism for a sintering machine according to any of the claim 1 to 5, wherein,
the dust removal frame body is a cylindrical barrel body, and the exhaust pipeline, the rotary cone, the dust removal filter cover and the dust removal frame body are coaxially arranged.
10. A flue gas bag type dust removal system is characterized in that,
comprising a bag house and the dust removal pretreatment mechanism for a sintering machine according to any one of claims 1 to 9, the bag house being downstream of the dust removal pretreatment mechanism for a sintering machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320516841.2U CN220003429U (en) | 2023-03-16 | 2023-03-16 | Dust removal pretreatment mechanism for sintering machine and flue gas bag type dust removal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320516841.2U CN220003429U (en) | 2023-03-16 | 2023-03-16 | Dust removal pretreatment mechanism for sintering machine and flue gas bag type dust removal system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220003429U true CN220003429U (en) | 2023-11-14 |
Family
ID=88692297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320516841.2U Active CN220003429U (en) | 2023-03-16 | 2023-03-16 | Dust removal pretreatment mechanism for sintering machine and flue gas bag type dust removal system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220003429U (en) |
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2023
- 2023-03-16 CN CN202320516841.2U patent/CN220003429U/en active Active
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