CN220059338U - Polymer alloy corner connector and corner assembling structure comprising same - Google Patents
Polymer alloy corner connector and corner assembling structure comprising same Download PDFInfo
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- CN220059338U CN220059338U CN202321660649.7U CN202321660649U CN220059338U CN 220059338 U CN220059338 U CN 220059338U CN 202321660649 U CN202321660649 U CN 202321660649U CN 220059338 U CN220059338 U CN 220059338U
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- 239000000956 alloy Substances 0.000 title claims abstract description 111
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 110
- 229920000642 polymer Polymers 0.000 title claims abstract description 51
- 229920002521 macromolecule Polymers 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 12
- 238000005187 foaming Methods 0.000 claims abstract description 4
- 239000003292 glue Substances 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 11
- 229920001187 thermosetting polymer Polymers 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 229920005992 thermoplastic resin Polymers 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 238000009434 installation Methods 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 230000035882 stress Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000004643 cyanate ester Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229920003192 poly(bis maleimide) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920006380 polyphenylene oxide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
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- Joining Of Corner Units Of Frames Or Wings (AREA)
Abstract
The utility model discloses a macromolecule alloy corner connector and a corner combination structure comprising the macromolecule alloy corner connector, wherein the macromolecule alloy corner connector comprises: an alloy profile provided with an outer corner portion and an inner corner portion, the alloy profile having a plurality of inner cavities; and the high molecular polymer is filled in the inner cavity and is a non-foaming solid body. Because the alloy section is provided with the outer corner part and the inner corner part, the alloy section can be used as the corner bracket, and the high-strength high-molecular polymer is filled in the inner cavity of the corner bracket, and is molded and solidified in the inner cavity, so that strong support is provided for the inner cavity of the corner bracket, deformation of the corner bracket due to stress is avoided, and compared with the solid corner bracket, the support strength of the corner bracket can be greatly enhanced under the premise of controllable cost, and the risk of cracking of doors and windows during installation and transportation is further reduced.
Description
Technical Field
The utility model relates to the technical field of door and window hardware, in particular to a high polymer alloy corner bracket and a corner combining structure comprising the same.
Background
As a few non-exposed fittings in doors and windows, the function of the corner connector in the doors and windows is important, the key fittings for realizing the corner installation of two profile groups are adopted, and the strength of the doors and windows is also closely related to the strength of the corner connector.
The existing corner brace is generally made of aluminum alloy, and a cavity is formed in the corner brace for saving cost. When the door and window are transported or installed, the corner connector and the section bar are not reinforced by glue injection, so that the stress point of the door and window is mainly concentrated at the joint of the section bar and the corner connector when the door and window is stressed. Particularly for large-size fan bodies, the supporting strength of the corner connector is limited due to the existence of the cavity, so that the corner connector is easy to deform due to overlarge stress, and the corner connector is cracked.
Although the solid corner connector can solve the technical problems, the solid corner connector is difficult to popularize due to the excessively high manufacturing cost. For this reason, there is a need to develop a new corner connector, which can solve the above technical problems, and has low cost advantage.
Disclosure of Invention
The utility model aims to provide a macromolecule alloy corner brace to solve the technical problem of insufficient supporting strength of the existing corner brace.
According to a first aspect of the present utility model, a polymer alloy corner joint according to an embodiment includes:
an alloy profile provided with an outer corner portion and an inner corner portion, the alloy profile having a plurality of inner cavities;
and the high molecular polymer is filled in the inner cavity and is a non-foaming solid body.
The macromolecule alloy corner connector provided by the embodiment of the utility model has at least the following beneficial effects: because the alloy section is provided with the outer corner part and the inner corner part, the alloy section can be used as the corner bracket, and the high-strength high-molecular polymer is filled in the inner cavity of the corner bracket, and is molded and solidified in the inner cavity, so that strong support is provided for the inner cavity of the corner bracket, deformation of the corner bracket due to stress is avoided, and compared with the solid corner bracket, the support strength of the corner bracket can be greatly enhanced under the premise of controllable cost, and the risk of cracking of doors and windows during installation and transportation is further reduced.
According to some embodiments of the utility model, the alloy profile comprises an alloy outer wall and an alloy inner wall dividing the alloy outer wall into at least two cavities containing the inner cavity, i.e. not necessarily all cavities need to be filled with a high molecular polymer.
According to some embodiments of the utility model, at least one of the alloy inner walls extends from the outer corner to the inner corner to maintain a distance between the outer corner and the inner corner by the alloy inner wall.
According to some embodiments of the utility model, one of the alloy inner walls extends from the inflection point of the outer corner to the inflection point of the inner corner, and the alloy profile is provided with a first glue guide groove along the top and/or bottom surface of the alloy inner wall. The first glue guide groove is used for guiding the two-component structural glue to the inner side of the corner connector from the outer side of the corner connector, so that glue injection fixation of the corner connector is realized.
According to some embodiments of the utility model, the top surface and/or the bottom surface of the high molecular polymer are/is provided with a second glue guiding groove, and the second glue guiding groove extends from the inflection point of the outer corner part to the inflection point of the inner corner part. Because the second glue guiding groove is arranged on the surface of the high polymer, the arrangement of an alloy inner wall can be saved, and in the filling process, the high polymer can be filled in the inner cavity at one time, so that the cost is effectively reduced, and finally, the mobility of the two-component structural glue in the second glue guiding groove is better than the mobility of the two-component structural glue in the first glue guiding groove.
According to some embodiments of the utility model, the alloy section is provided with a glue guiding port communicated with the second glue guiding groove. The second glue guiding groove and the glue guiding opening are jointly used for guiding the two-component structural glue to the inner side of the corner connector from the outer side of the corner connector, so that glue injection fixation of the corner connector is realized.
According to some embodiments of the utility model, the outer corner portion is provided with a screw hole for mechanical connection of the corner bracket to the bevel profile. In some embodiments, the screw holes are directly connected to a portion of the cavity to reserve a connection space for the bolts.
According to some embodiments of the utility model, the alloy profile comprises an aluminum alloy member, since aluminum alloy is a common material in the field of doors and windows.
According to some embodiments of the present utility model, since both the thermosetting resin and the thermoplastic resin can be processed into a solid body of high strength, the high molecular polymer includes a thermosetting resin member or a thermoplastic resin member.
According to a second aspect of the utility model, the corner combining structure comprises two inclined notch sections and the polymer alloy corner connector, wherein the two inclined notch sections are respectively provided with a containing cavity capable of containing the polymer alloy corner connector, and the two inclined notch sections are assembled into a right-angle component through the polymer alloy corner connector.
The corner combining structure provided by the embodiment of the utility model has at least the following beneficial effects: because the macromolecule alloy corner brace has the supporting strength similar to that of the solid corner brace, the corner brace structure cannot easily crack due to insufficient supporting strength of the corner brace, and has good market prospect.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic perspective view of a polymer alloy corner connector according to an embodiment of the present utility model;
FIG. 2 is a top view of the polymer alloy corner piece shown in FIG. 1;
FIG. 3 is an exploded perspective view of the polymer alloy corner bracket shown in FIG. 1;
FIG. 4 is a schematic perspective view of a polymer alloy corner connector according to a second embodiment of the present utility model;
FIG. 5 is a top view of the polymer alloy corner piece shown in FIG. 4;
fig. 6 is an exploded perspective view of the polymer alloy corner bracket shown in fig. 4.
In the accompanying drawings: 100-alloy section bar, 200-alloy outer wall, 110-inner cavity, 300-alloy inner wall, 210-outer corner part, 220-inner corner part, 211-screw hole, 120-cavity, 310-first glue guiding groove, 400-high polymer, 130-rib, 410-second glue guiding groove and 140-glue guiding opening.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
As shown in fig. 1 to 3, the polymer alloy corner connector according to the first embodiment of the present utility model includes an alloy section 100, where the alloy section 100 may be an alloy aluminum member or an alloy steel member, and since the alloy section is a general material in the door and window field, the alloy section 100 is preferably made of an alloy aluminum material, so as to achieve the effects of light weight, corrosion resistance, and excellent tensile properties. The alloy section 100 is generally formed by slitting a long section, and the long section is formed by processing a round bar blank through an extrusion process, and the length of the processed long section can generally reach three meters to six meters.
Generally, the overall shape of the alloy section 100 for the corner connector is rectangular, and is surrounded by an alloy outer wall 200, and an inner cavity 110 is provided therein, and the number of the inner cavities 110 is determined by the number of the alloy inner walls 300. The alloy inner wall 300 is mainly used for connecting the outer corner 210 and the inner corner 220 of the alloy outer wall 200 to strengthen the supporting strength of the alloy section 100, and the alloy inner wall 300 partitions the alloy outer wall 200 into at least two inner cavities 110. In order to facilitate the connection of the corner bracket to the diagonal cut profile, the outer corner 210 is provided with screw holes 211 on both sides of the right angle, respectively. During installation, the corner connector is firstly embedded in the two inclined notch profiles, and then is connected to the screw hole 211 from outside to inside by adopting bolts, so that the corner connector and the inclined notch profiles are mechanically connected.
Further, in order to reserve a connection space for the bolt, a portion of the alloy inner wall 300 does not extend from the outer corner portion 210 to the inner corner portion 220, but surrounds the cavity-avoiding portion 120 communicated with the screw hole 211 with the alloy outer wall 200, and after the bolt is screwed with the screw hole 211, the threaded portion of the bolt is located in the cavity-avoiding portion 120, and at this time, the cavity-avoiding portion 120 and the cavity-avoiding portion 110 together form a cavity of the alloy section 100, that is, the cavity-avoiding portion 120 includes the cavity-avoiding portion 110 and the cavity-avoiding portion 120.
Because the strength of the mechanical connection is insufficient to support the stress condition of the door and window, the corner connector and the oblique incision section bar are also required to be chemically connected through the two-component structural adhesive so as to finally form an integrated corner combining structure. For this purpose, the alloy section 100 is provided with a first glue guiding groove 310 along the top surface and/or the bottom surface of one of the alloy inner walls 300, and the first glue guiding groove 310 is used for guiding the two-component structural glue from the outer side of the corner connector to the inner side of the corner connector, thereby realizing the glue injection fixation of the corner combining structure. Since the prior art corner pieces all have the alloy inner wall 300 extending from the inflection point of the outer corner portion 210 to the inflection point of the inner corner portion 220, the first glue groove 310 is generally provided on the surface of the alloy inner wall 300.
The conventional corner connector is easy to deform due to overlarge stress during transportation or installation of doors and windows, and further the corner connector is cracked, so that the structure of the corner connector needs to be improved. For this purpose, after the long profile is extruded, the inner cavity 110 of the long profile is gradually filled with the high molecular polymer 400 by a casting machine, and the high molecular polymer 400 is a non-foaming solid body, and is optionally a thermosetting resin member or a thermoplastic resin member. The thermosetting resin is a high molecular material, molecular chains are chemically crosslinked together to form a rigid three-dimensional network structure, and the crosslinked structure can not be repeatedly processed and formed in the polymerization process, so that the thermosetting resin has the comprehensive properties of high strength, good heat resistance, excellent electrical performance, corrosion resistance, aging resistance, good dimensional stability and the like. The thermoplastic resin is a high molecular weight solid at normal temperature, is a linear or polymer with a small amount of branched chains, has no crosslinking among molecules, is softened and flows by heating under pressure in the molding process, does not generate chemical crosslinking, can be shaped in a mold, is cooled and shaped to obtain a product with a required shape, and basically does not change the molecular structure in the repeated heating process, but can be degraded or decomposed when the temperature is too high and the time is too long.
If the high molecular polymer 400 is a thermosetting resin member, it specifically includes epoxy resin, polyester resin, vinyl ester, bismaleimide, thermosetting polyimide, cyanate ester, and the like. If the high molecular polymer 400 is a thermoplastic resin member, it specifically includes polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamide, polyoxymethylene, polycarbonate, polyphenylene oxide, polysulfone, rubber, and the like.
Next, the long section filled with the high polymer 400 is cut into a plurality of high polymer alloy corner pieces under the cutting of the cutting machine, and the high polymer 400 is molded and solidified in the inner cavity 110 to bear force, so that strong support is provided for the inner cavity 110 of the corner piece, deformation of the corner piece due to the force is avoided, and compared with the solid corner piece, the support strength of the corner piece can be greatly enhanced on the premise of controllable cost, and further the risk of cracking of doors and windows during installation and transportation is reduced.
It should be further noted that if the alloy section 100 has the cavity 120, the polymer 400 does not need to be filled into the alloy section, i.e., not all the cavities need to be filled with the polymer 400, so as to ensure the normal connection between the bolt and the screw hole 211.
In some embodiments of the present utility model, in order to enhance the connection strength between the high molecular polymer 400 and the alloy profile 100, the alloy profile 100 is provided with a convex rib 130 in the inner cavity 110, and the rib 130 and the high molecular polymer 400 form a structure of mutually clamping.
As shown in fig. 4 to 6, this is a polymer alloy corner connector according to the second embodiment of the present utility model, which is different from the first embodiment in that:
1. the alloy inner wall 300 forming the inner cavity 110 is omitted, and the number of the inner cavities 110 of the alloy section 100 is one;
2. the glue guiding groove is formed on the top surface and/or the bottom surface of the high polymer 400, and is defined as a second glue guiding groove 410, the second glue guiding groove 410 extends from the inflection point of the outer corner 210 to the inflection point of the inner corner 220, and the alloy profile 100 is provided with a glue guiding opening 140 communicated with the second glue guiding groove 410.
For the first difference, since the number of the inner cavities 110 of the alloy section 100 is one, the casting machine can fill the inner cavities 110 of the long section with the high polymer 400 at one time, so as to simplify the casting process. In addition, since the inner cavity 110 of the alloy section 100 is supported by the polymer 400, the use effect of the polymer alloy corner connector is not greatly changed even if the support of the alloy inner wall 300 is removed, and the manufacturing cost is further saved, but the embodiment cannot be used along the existing mold, and the mold needs to be redesigned.
For the second difference point, since the high polymer 400 is easier to be machined than the alloy material, the processing cost and the processing efficiency of the second glue guiding groove 410 are better, and since the two-component structural glue and the high polymer 400 are made of the same high polymer material, the fluidity of the two-component structural glue in the second glue guiding groove 410 is better than that of the first glue guiding groove 310, and the glue injection operation is more facilitated.
The corner fitting structure according to the second aspect of the present utility model comprises the polymer alloy corner fitting according to the first aspect of the present utility model, and further comprises two diagonal cut profiles (not shown in the drawings), wherein both of the diagonal cut profiles have a receiving cavity capable of receiving the polymer alloy corner fitting. When the angle combining of the two oblique incision sectional materials is needed to be realized, firstly, the macromolecule alloy angle brackets are respectively embedded into the accommodating cavities of the two oblique incision sectional materials, then the macromolecule alloy angle brackets are respectively connected with the two oblique incision sectional materials through bolts, finally, the two-component structural adhesive is injected into the adhesive injection port of the oblique incision sectional materials, and the two-component structural adhesive is guided to the inner side of the macromolecule alloy angle brackets from the outer side of the macromolecule alloy angle brackets under the action of the adhesive guiding groove, so that the adhesive injection fixing of the angle combining structure is realized, and finally, the two oblique incision sectional materials are assembled into a right-angle assembly through the macromolecule alloy angle brackets.
The corner assembling structure adopts all the technical schemes of all the embodiments, so that the corner assembling structure has at least all the beneficial effects brought by the technical schemes of the embodiments, and is not described in detail herein.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (10)
1. The polymer alloy angle sign indicating number, its characterized in that includes:
an alloy profile (100) provided with an outer corner portion (210) and an inner corner portion (220), the alloy profile (100) having a number of inner cavities (110);
and a high molecular polymer (400) filled in the inner cavity (110), wherein the high molecular polymer (400) is a non-foaming solid body.
2. The polymeric alloy angle code of claim 1, wherein: the alloy profile (100) comprises an alloy outer wall (200) and an alloy inner wall (300), the alloy inner wall (300) dividing the alloy outer wall (200) into at least two cavities, the cavities comprising the inner cavity (110).
3. The polymeric alloy angle code of claim 2, wherein: at least one of the alloy inner walls (300) extends from the outer corner (210) to the inner corner (220).
4. A polymeric alloy angle according to claim 3, wherein: one of the alloy inner walls (300) extends from the inflection point of the outer corner part (210) to the inflection point of the inner corner part (220), and the alloy section (100) is provided with a first glue guide groove (310) along the top surface and/or the bottom surface of the alloy inner wall (300).
5. The polymeric alloy corner brace of claim 1 or 2, wherein: a second glue guiding groove (410) is formed in the top surface and/or the bottom surface of the high-molecular polymer (400), and the second glue guiding groove (410) extends from the inflection point of the outer corner part (210) to the inflection point of the inner corner part (220).
6. The polymeric alloy angle code of claim 5, wherein: the alloy section bar (100) is provided with a glue guiding port (140) communicated with the second glue guiding groove (410).
7. The polymeric alloy corner brace of claim 1 or 2, wherein: the outer corner (210) is provided with a screw hole (211).
8. The polymeric alloy angle code of claim 1, wherein: the alloy profile (100) comprises an aluminium alloy member.
9. The polymeric alloy angle code of claim 1, wherein: the high molecular polymer (400) includes a thermosetting resin member or a thermoplastic resin member.
10. A corner fitting structure comprising the polymer alloy corner fitting according to any one of claims 1 to 9, further comprising: the two oblique incision sectional materials are respectively provided with a containing cavity capable of containing the macromolecule alloy corner connector, and the two oblique incision sectional materials are spliced into a right-angle assembly through the macromolecule alloy corner connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321660649.7U CN220059338U (en) | 2023-06-27 | 2023-06-27 | Polymer alloy corner connector and corner assembling structure comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321660649.7U CN220059338U (en) | 2023-06-27 | 2023-06-27 | Polymer alloy corner connector and corner assembling structure comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220059338U true CN220059338U (en) | 2023-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321660649.7U Active CN220059338U (en) | 2023-06-27 | 2023-06-27 | Polymer alloy corner connector and corner assembling structure comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220059338U (en) |
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2023
- 2023-06-27 CN CN202321660649.7U patent/CN220059338U/en active Active
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