CN220480838U - Electrolytic water film electrode assembling and positioning device - Google Patents
Electrolytic water film electrode assembling and positioning device Download PDFInfo
- Publication number
- CN220480838U CN220480838U CN202322053738.1U CN202322053738U CN220480838U CN 220480838 U CN220480838 U CN 220480838U CN 202322053738 U CN202322053738 U CN 202322053738U CN 220480838 U CN220480838 U CN 220480838U
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- positioning
- membrane electrode
- frame
- assembly
- electrolytic water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 239000012528 membrane Substances 0.000 claims abstract description 72
- 238000007789 sealing Methods 0.000 claims abstract description 50
- 238000001179 sorption measurement Methods 0.000 claims abstract description 42
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000000306 component Substances 0.000 description 18
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Landscapes
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The utility model discloses an electrolytic water film electrode assembling and positioning device, which comprises: the vacuum adsorption assembly is provided with a first positioning hole which is communicated with the vacuum adsorption assembly; the supporting plate is positioned below the vacuum adsorption assembly, and the top end of the supporting plate is provided with a positioning pin; the positioning frame is provided with a second positioning hole, the three-in-one membrane electrode is configured in the second positioning hole so as to position the three-in-one membrane electrode by the second positioning hole, and the positioning pin is also used for sequentially penetrating through the first positioning hole, the first sealing frame, the positioning frame and the second sealing frame so as to position and align the first sealing frame, the three-in-one membrane electrode and the second sealing frame; the driving component is arranged at the bottom end of the supporting plate. The alignment precision of the three-in-one membrane electrode and the sealing frame can be improved, so that the performance and durability of the 5CCM formed by assembly are improved. In addition, the structure of this application is simple, and the equipment is simple, easy and simple to handle, low cost.
Description
Technical Field
The utility model relates to the technical field of fuel cells, in particular to an electrolytic water film electrode assembling and positioning device.
Background
The membrane electrode is a core component of a PEM (proton exchange membrane) electrolytic cell and is a place where electrochemical reaction occurs in the PEM electrolytic cell, and the three-in-one membrane electrode (3 CCM) consists of a proton exchange membrane and cathode and anode catalysts coated on the front side and the back side of the proton exchange membrane. Since the back pressure of PEM electrolysers is as high as a few mpa when operated, the three-in-one membrane electrode must have a certain mechanical strength and tightness. Meanwhile, the proton exchange membrane of the three-in-one membrane electrode is easily wrinkled and deformed under the influence of temperature and humidity, so that the performance of the PEM electrolytic tank is reduced. Therefore, the three-in-one membrane electrode is required to be packaged in the sealing frame, so that the three-in-one membrane electrode is fixed and sealed, and the five-in-one membrane electrode (5 CCM) is formed, thereby being beneficial to improving the flatness and mechanical strength of the three-in-one membrane electrode. Therefore, in the 5CCM assembly process, the method is particularly important for the smooth and accurate positioning of the three-in-one membrane electrode and the sealing frame. However, when the existing 5CCM is positioned and assembled, the alignment of the three-in-one membrane electrode and the sealing frame is usually realized manually, so that the alignment precision cannot be ensured, the three-in-one membrane electrode cannot be accurately placed in the sealing frame, and the area of an active area is affected, so that the performance and durability of the 5CCM are reduced.
Disclosure of Invention
Accordingly, it is necessary to provide an electrolytic water membrane electrode assembly positioning device capable of improving the alignment accuracy of the three-in-one membrane electrode and the seal frame.
An electrolytic water membrane electrode assembly positioning device, comprising:
the vacuum adsorption assembly is provided with a first positioning hole which is communicated with the vacuum adsorption assembly, and the vacuum adsorption assembly is used for sequentially adsorbing the first sealing frame, the three-in-one membrane electrode and the second sealing frame;
the supporting plate is positioned below the vacuum adsorption assembly, and a positioning pin is arranged at the top end of the supporting plate;
the positioning frame is provided with a second positioning hole, the three-in-one membrane electrode is arranged in the second positioning hole so as to position the three-in-one membrane electrode by the second positioning hole, and the positioning pin is also used for sequentially penetrating through the first positioning hole, the first sealing frame, the positioning frame and the second sealing frame so as to position and align the first sealing frame, the three-in-one membrane electrode and the second sealing frame; and
the driving assembly is arranged at the bottom end of the supporting plate and used for driving the supporting plate to be close to or far away from the vacuum adsorption assembly so as to realize the insertion or separation of the positioning pin relative to the first positioning hole.
Optionally, the number of the first positioning holes and the positioning pins is multiple, the first positioning holes encircle the circumference of the vacuum adsorption assembly, the positioning pins encircle the circumference of the supporting plate, and the first positioning holes and the positioning pins are in one-to-one correspondence.
Optionally, the positioning frame is further provided with a third positioning hole, and the positioning pin is used for sequentially penetrating through the first positioning hole, the first sealing frame, the third positioning hole and the second sealing frame.
Optionally, the number of the third positioning holes is multiple, the multiple third positioning holes are arranged around the circumference of the positioning frame, and the multiple third positioning holes and the multiple positioning pins are in one-to-one correspondence.
Optionally, the electrolytic water film electrode assembling and positioning device further comprises a linear sliding bearing, the linear sliding bearing is arranged in the first positioning hole, and the positioning pin is used for being inserted into the linear sliding bearing.
Optionally, the number of the linear sliding bearings is multiple, and the multiple linear sliding bearings are arranged in the multiple first positioning holes in a one-to-one correspondence manner.
Optionally, the shape and the size of the second positioning hole are consistent with those of the three-in-one membrane electrode.
Optionally, the electrolytic water film electrode assembling and positioning device further comprises a support frame, the support frame is hollow, the vacuum adsorption component is arranged at the top end of the support frame, and the driving component and the supporting plate are both arranged in the support frame.
Optionally, the support frame includes bottom plate and a plurality of support column, a plurality of the bottom of support column is encircled the circumference setting of bottom plate, a plurality of the top of support column is encircleed vacuum adsorption subassembly's bottom circumference setting, drive assembly's one end set up in on the bottom plate, drive assembly's the other end with the layer board is connected.
Optionally, the driving component can stretch out and draw back relative to the driving component so as to drive the supporting plate to reciprocate along the vertical direction.
The application provides an electrolytic water membrane electrode equipment positioner through being provided with the locating frame to set up the second locating hole in the locating frame, the second locating hole can carry out the accurate positioning to trinity membrane electrode, then the locating pin passes first locating hole, first sealed frame, locating frame and the sealed frame of second in proper order, can guarantee the accurate positioning of first sealed frame, trinity membrane electrode and the sealed frame of second on vacuum adsorption subassembly, and realize the accurate counterpoint between first sealed frame, trinity membrane electrode and the sealed frame of second. Therefore, the three-in-one membrane electrode can be accurately packaged in the sealing frame formed by surrounding the first sealing frame and the second sealing frame, and the alignment precision of the three-in-one membrane electrode and the sealing frame is improved, so that the performance and durability of the 5CCM formed by assembling are improved. In addition, the structure of this application is simple, and the equipment is simple, easy and simple to handle, low cost.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an assembly positioning device for an electrolytic water membrane electrode in an embodiment;
FIG. 2 is a top view of a vacuum chuck assembly according to one embodiment;
FIG. 3 is a schematic view of a pallet according to an embodiment;
FIG. 4 is a top view of a positioning frame according to an embodiment;
FIG. 5 is a schematic diagram of a split structure of a 5CCM assembly according to an embodiment;
FIG. 6 is a schematic diagram of the overall structure of a 5CCM in an embodiment.
1. A vacuum adsorption assembly; 11. a first positioning hole; 2. a supporting plate; 21. a positioning pin; 3. a positioning frame; 31. a second positioning hole; 32. a third positioning hole; 4. a drive assembly; 5. a first sealing frame; 6. three-in-one membrane electrode; 7. a second sealing frame; 8. a linear sliding bearing; 9. a support frame; 91. a bottom plate; 92. and (5) supporting the column.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
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, "and/or" throughout this document includes three schemes, taking a and/or B as an example, including a technical scheme, a technical scheme B, and a technical scheme that both a and B satisfy; 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.
Referring to fig. 1 to 5, the application provides an electrolytic water film electrode assembling and positioning device, which comprises a vacuum adsorption component 1, a supporting plate 2, a positioning frame 3 and a driving component 4, wherein the vacuum adsorption component 1 is provided with a first positioning hole 11 which is arranged in a penetrating way, and the vacuum adsorption component 1 is used for sequentially adsorbing a first sealing frame 5, a three-in-one membrane electrode 6 and a second sealing frame 7; the supporting plate 2 is positioned below the vacuum adsorption assembly 1, and the top end of the supporting plate 2 is provided with a positioning pin 21; the positioning frame 3 is provided with a second positioning hole 31 which is vertically and vertically communicated, the three-in-one membrane electrode 6 is arranged in the second positioning hole 31 to position the three-in-one membrane electrode 6 by the second positioning hole 31, and the positioning pin 21 is also used for sequentially penetrating through the first positioning hole 11, the first sealing frame 5, the positioning frame 3 and the second sealing frame 7 to position and align the first sealing frame 5, the three-in-one membrane electrode 6 and the second sealing frame 7; the driving component 4 is disposed at the bottom end of the supporting plate 2, and the driving component 4 is used for driving the supporting plate 2 to approach or depart from the vacuum adsorption component 1, so as to realize the plugging or separating of the positioning pin 21 relative to the first positioning hole 11.
The application provides an electrolytic water membrane electrode equipment positioner through being provided with locating frame 3 to second locating hole 31 has been seted up in locating frame 3, and second locating hole 31 can carry out the accurate positioning to trinity membrane electrode 6, then locating pin 21 passes first locating hole 11, first sealed frame 5, locating frame 3 and second sealed frame 7 in proper order, can guarantee the accurate positioning of first sealed frame 5, trinity membrane electrode 6 and second sealed frame 7 on vacuum adsorption subassembly 1, and realizes the accurate counterpoint between first sealed frame 5, trinity membrane electrode 6 and the sealed frame 7 of second. Therefore, this application can make trinity membrane electrode 6 accurate encapsulation in the sealed frame that first sealed frame 5 and second sealed frame 7 surround and constitute, improves trinity membrane electrode 6 and sealed frame's alignment precision to improve the performance and the durability of the 5CCM that the equipment formed. In addition, the structure of this application is simple, and the equipment is simple, easy and simple to handle, low cost.
Specifically, the vacuum adsorption component 1 is internally provided with a cavity, the adsorption surface of the vacuum adsorption component 1 is provided with a plurality of adsorption holes, the cavity is in a negative pressure state, the negative pressure state can be obtained by vacuumizing the cavity, so that pressure difference is generated between the inside and the outside of the vacuum adsorption component 1, adsorption force is generated by the plurality of adsorption holes, and the adsorption to the first sealing frame 5, the three-in-one membrane electrode 6 and the second sealing frame 7 is realized.
In this embodiment, the vacuum adsorption assembly 1 and the support plate 2 are both rectangular in shape to fit each assembly of the rectangular five-in-one membrane electrode.
Specifically, the dimensions of the first positioning hole 11 and the positioning pin 21 are adapted to achieve accurate positioning of the vacuum suction assembly 1 and the pallet 2.
Referring to fig. 4 and 5, the shape and size of the second positioning hole 31 are consistent with those of the three-in-one membrane electrode 6, and in this embodiment, the shapes of the second positioning hole 31 and the three-in-one membrane electrode 6 are rectangular, and the second positioning hole 31 is located in the middle of the positioning frame 3.
Further, the height of the positioning pins 21 is greater than the thickness of the vacuum suction assembly 1.
Specifically, positioning holes corresponding to the positions are formed in the periphery of the first sealing frame 5 and the periphery of the second sealing frame 7, and the number of the positioning holes is the same as that of the positioning pins 21 and corresponds to one of the positioning holes one by one.
Further, the positioning holes are matched with the positioning pins 21, so that accurate alignment between the first sealing frame 5 and the second sealing frame 7 is realized.
Further, the middle parts of the first sealing frame 5 and the second sealing frame 7 are respectively provided with a containing hole for exposing the active area of the three-in-one membrane electrode 6.
Referring to fig. 2 and 3, the number of the first positioning holes 11 and the positioning pins 21 is plural, the plurality of first positioning holes 11 are disposed around the circumference of the vacuum suction assembly 1, the plurality of positioning pins 21 are disposed around the circumference of the pallet 2, and the plurality of positioning holes and the plurality of positioning pins 21 are in one-to-one correspondence.
Specifically, the positioning pin 21 is provided on the pallet 2 by screw fastening.
Referring to fig. 4, the positioning frame 3 is further provided with a third positioning hole 32, and the positioning pin 21 is used for sequentially passing through the first positioning hole 11, the first sealing frame 5, the third positioning hole 32 and the second sealing frame 7.
Specifically, the third positioning hole 32 and the positioning pin 21 are adapted to realize accurate positioning of the positioning frame 3 and the vacuum adsorption assembly 1.
Referring to fig. 4, the number of the third positioning holes 32 is plural, the plurality of third positioning holes 32 are disposed around the circumference of the positioning frame 3, and the plurality of third positioning holes 32 and the plurality of positioning pins 21 are in one-to-one correspondence.
Further, a plurality of third positioning holes 32 are provided along the outer periphery of the second positioning hole 31.
Referring to fig. 2, the electrolytic water membrane electrode assembly positioning device further includes a linear sliding bearing 8, the linear sliding bearing 8 is disposed in the first positioning hole 11, and the positioning pin 21 is used for being inserted into the linear sliding bearing 8. Because the bearing ball of the linear sliding bearing 8 is in point contact with the bearing jacket, the steel ball rolls with minimum friction resistance, so the linear sliding bearing 8 has the characteristics of small friction and high stability, and can ensure that the positioning pin 21 can obtain stable linear motion with high sensitivity and high precision, thereby ensuring the stable positioning precision of the positioning pin 21 and being difficult to wear.
Referring to fig. 2, the number of the linear sliding bearings 8 is plural, and the plurality of linear sliding bearings 8 are disposed in the plurality of first positioning holes 11 in one-to-one correspondence.
In the present embodiment, the number of the first positioning holes 11, the linear slide bearing 8, the positioning pins 21, and the third positioning holes 32 is eight.
Referring to fig. 1, the electrolytic water membrane electrode assembly positioning device further comprises a support frame 9, the interior of the support frame 9 is hollow, the vacuum adsorption component 1 is arranged at the top end of the support frame 9, and the driving component 4 and the supporting plate 2 are both arranged in the support frame 9.
Referring to fig. 1, the supporting frame 9 includes a bottom plate 91 and a plurality of supporting columns 92, bottom ends of the plurality of supporting columns 92 are disposed around a circumference of the bottom plate 91, top ends of the plurality of supporting columns 92 are disposed around a circumference of a bottom end of the vacuum adsorption assembly 1, one end of the driving assembly 4 is disposed on the bottom plate 91, and the other end of the driving assembly 4 is connected with the supporting plate 2.
Specifically, the bottom plate 91 is a rectangular parallelepiped plate-like structure, the number of support columns 92 is four, and the four support columns 92 are respectively disposed at four corners of the bottom plate 91 to constitute the support frame 9.
Referring to fig. 1, the driving assembly 4 can telescope with respect to itself to drive the pallet 2 to reciprocate in a vertical direction.
Specifically, the driving component 4 is an electric cylinder with a guide rod, and the use of the electric cylinder also accelerates the production efficiency.
The working principle of the application is as follows:
referring to fig. 5 and 6, the driving assembly 4 pushes the supporting plate 2 upwards, thereby the positioning pin 21 ascends to the vacuum adsorption panel through the linear sliding bearing 8, the first sealing frame 5 is flatly paved on the vacuum adsorption assembly 1 through the positioning pin 21, the positioning frame 3 is put into the first sealing frame 5 through the positioning pin 21, the three-in-one membrane electrode 6 is accurately inlaid in the three-in-one membrane electrode 6 positioning frame 3, meanwhile, the three-in-one membrane electrode 6 is flatly adsorbed on the vacuum adsorption assembly 1, the positioning frame 3 is removed, the second sealing frame 7 is flatly paved on the three-in-one membrane electrode 6 through the positioning pin 21, thus the accurate alignment assembly of 5CCM is realized, and finally, the five-in-one membrane electrode is formed by hot pressing.
The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).
Claims (10)
1. An electrolytic water membrane electrode assembly positioning device, characterized by comprising:
the vacuum adsorption assembly is provided with a first positioning hole which is communicated with the vacuum adsorption assembly, and the vacuum adsorption assembly is used for sequentially adsorbing the first sealing frame, the three-in-one membrane electrode and the second sealing frame;
the supporting plate is positioned below the vacuum adsorption assembly, and a positioning pin is arranged at the top end of the supporting plate;
the positioning frame is provided with a second positioning hole, the three-in-one membrane electrode is arranged in the second positioning hole so as to position the three-in-one membrane electrode by the second positioning hole, and the positioning pin is also used for sequentially penetrating through the first positioning hole, the first sealing frame, the positioning frame and the second sealing frame so as to position and align the first sealing frame, the three-in-one membrane electrode and the second sealing frame; and
the driving assembly is arranged at the bottom end of the supporting plate and used for driving the supporting plate to be close to or far away from the vacuum adsorption assembly so as to realize the insertion or separation of the positioning pin relative to the first positioning hole.
2. The electrolytic water membrane electrode assembly positioning device according to claim 1, wherein the number of the first positioning holes and the number of the positioning pins are multiple, the first positioning holes are arranged around the circumference of the vacuum adsorption assembly, the positioning pins are arranged around the circumference of the supporting plate, and the first positioning holes and the positioning pins are in one-to-one correspondence.
3. The electrolytic water membrane electrode assembly positioning device according to claim 2, wherein the positioning frame is further provided with a third positioning hole, and the positioning pin is used for sequentially penetrating through the first positioning hole, the first sealing frame, the third positioning hole and the second sealing frame.
4. The electrolytic water membrane electrode assembly positioning device according to claim 3, wherein the number of the third positioning holes is plural, the plurality of the third positioning holes are arranged around the circumference of the positioning frame, and the plurality of the third positioning holes and the plurality of the positioning pins are in one-to-one correspondence.
5. The electrolytic water membrane electrode assembly positioning device according to claim 1, further comprising a linear slide bearing disposed in the first positioning hole, the positioning pin being configured to be inserted into the linear slide bearing.
6. The electrolytic water membrane electrode assembly positioning device according to claim 5, wherein the number of the linear sliding bearings is plural, and the plurality of linear sliding bearings are arranged in the plurality of first positioning holes in one-to-one correspondence.
7. The electrolytic water membrane electrode assembly positioning device according to claim 1, wherein the shape and size of the second positioning hole are consistent with the shape and size of the three-in-one membrane electrode.
8. The electrolytic water membrane electrode assembly positioning device according to claim 1, further comprising a support frame, wherein the interior of the support frame is hollow, the vacuum adsorption assembly is arranged at the top end of the support frame, and the driving assembly and the supporting plate are both arranged in the interior of the support frame.
9. The electrolytic water membrane electrode assembly positioning device according to claim 8, wherein the support frame comprises a bottom plate and a plurality of support columns, the bottom ends of the support columns are circumferentially arranged around the bottom plate, the top ends of the support columns are circumferentially arranged around the bottom end of the vacuum adsorption assembly, one end of the driving assembly is arranged on the bottom plate, and the other end of the driving assembly is connected with the supporting plate.
10. The electrolytic water membrane electrode assembly positioning device according to claim 1, wherein the driving component can stretch and retract relative to the driving component so as to drive the supporting plate to reciprocate along the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322053738.1U CN220480838U (en) | 2023-08-01 | 2023-08-01 | Electrolytic water film electrode assembling and positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322053738.1U CN220480838U (en) | 2023-08-01 | 2023-08-01 | Electrolytic water film electrode assembling and positioning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220480838U true CN220480838U (en) | 2024-02-13 |
Family
ID=89842560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322053738.1U Active CN220480838U (en) | 2023-08-01 | 2023-08-01 | Electrolytic water film electrode assembling and positioning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220480838U (en) |
-
2023
- 2023-08-01 CN CN202322053738.1U patent/CN220480838U/en active Active
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