CN219119708U - Shock-absorbing structure of electric power protection secondary equipment and electric power protection secondary equipment - Google Patents
Shock-absorbing structure of electric power protection secondary equipment and electric power protection secondary equipment Download PDFInfo
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- CN219119708U CN219119708U CN202223032493.6U CN202223032493U CN219119708U CN 219119708 U CN219119708 U CN 219119708U CN 202223032493 U CN202223032493 U CN 202223032493U CN 219119708 U CN219119708 U CN 219119708U
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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
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model belongs to the technical field of power protection substations, and particularly relates to a damping structure of power protection secondary equipment and the power protection secondary equipment. The damping structure comprises an elastic buffer piece and a fastening piece, wherein the elastic buffer piece comprises a first elastic backing ring, a second elastic backing ring and an elastic sleeve, the first elastic backing ring and the second elastic backing ring are respectively arranged on two sides of a printed circuit board, the elastic sleeve is used for penetrating through a fixed connection hole of the printed circuit board, the fastening piece penetrates through the first elastic backing ring, the second elastic backing ring and the elastic sleeve to clamp the printed circuit board between the first elastic backing ring and the second elastic backing ring, the printed circuit board is separated from the fastening piece through the elastic sleeve, the printed circuit board is prevented from being damaged due to collision between the printed circuit board and the fastening piece with higher hardness, and the service life of the printed circuit board is guaranteed.
Description
Technical Field
The utility model belongs to the technical field of power protection substations, and particularly relates to a damping structure of power protection secondary equipment and the power protection secondary equipment.
Background
The electric power protection secondary equipment needs to be close to primary equipment and installed in an unprotected mode outdoors, the electric power protection secondary equipment needs to bear wind and sun in an actual environment, the service environment is harsh, meanwhile, the electric power protection secondary equipment is required to have a very high protection effect on internal products, the waterproof grade of IP67 and the service environment of 70 degrees are required to be met, and high vibration generated under the service conditions such as switching action of a switching mechanism can be required to be tolerated.
In the prior art, electric power protection secondary equipment includes equipment base, casing and arranges the printed circuit board in the casing, because inside printed circuit board is destroyed when receiving shakes easily, generally need design shock-absorbing structure protect it, in the prior art generally with shock-absorbing structure setting outside the casing, reduce the vibrations that inside printed circuit board received through carrying out the absorbing mode to equipment casing and the whole base, but can lead to shock-absorbing structure overall dimension great like this, shock-absorbing rubber's volume also can be great, on the other hand sets up shock-absorbing structure outside the casing, long-time use leads to shock-absorbing rubber life to shorten easily, and then influence electric power protection secondary equipment's life.
The utility model provides an electric power protection secondary equipment buffer structure among the prior art has "local protection device shock-absorbing structure and damping method" as disclosed in the chinese patent application of application publication No. CN109149506a, this local protection device shock-absorbing structure (i.e. electric power protection secondary equipment buffer structure) is including setting up the shock attenuation screw between casing and device casing, the shock attenuation screw passes through the double-screw bolt to be fixed on the support double-screw bolt of frame casing, the top surface of shock attenuation screw constitutes the plane that supplies printed circuit board to fix, printed circuit board passes through the screw to be fixed at the top surface of shock attenuation screw, and then form flexible shock attenuation installation environment through the screw, directly for printed circuit board in axial and radial all shock attenuation, and then solve above-mentioned technical problem.
However, the printed circuit board of the shock-absorbing structure is directly fixed on the top surface of the shock-absorbing screw through the screw, and no matter the printed circuit board is subjected to radial shock or axial shock in actual shock, the printed circuit board can be directly contacted with the screw with higher hardness, the printed circuit board is easy to damage after long-time use, and the service life of the printed circuit board is low.
Disclosure of Invention
The utility model aims to provide a damping structure of power protection secondary equipment, so as to solve the technical problem that the service life of a printed circuit board is low because the damping structure in the prior art cannot well protect the printed circuit board.
In order to achieve the above purpose, the technical scheme of the damping structure of the electric power protection secondary equipment of the utility model is as follows:
the utility model provides an electric power protection secondary equipment shock-absorbing structure, including elastic buffer and fastener, elastic buffer includes first elasticity backing ring, second elasticity backing ring and elastic sleeve, and wherein first elasticity backing ring, second elasticity backing ring are used for setting up in the both sides of printed circuit board respectively, and the elastic sleeve is used for passing the fixed connection hole of printed circuit board, and the fastener passes first elasticity backing ring, second elasticity backing ring and elastic sleeve in order to press from both sides printed circuit board tight between first elasticity backing ring and second elasticity backing ring, and separates printed circuit board and fastener through the elastic sleeve.
The beneficial effects are that: according to the electric power protection secondary equipment damping structure, the elastic buffer piece is designed to be the first elastic backing ring, the second elastic backing ring and the elastic sleeve penetrating through the fixed connection holes of the printed circuit board respectively arranged on two sides of the printed circuit board, so that the printed circuit board can be clamped between the first elastic backing ring and the second elastic backing ring by using the fastening pieces, the fastening pieces with higher hardness can be isolated from the printed circuit board by using the first elastic backing ring, the second elastic backing ring and the elastic sleeve, the circuit board is protected while the axial vibration and the radial vibration are absorbed by the damping structure, the service life of the circuit board is prolonged, and the technical problem that the service life of the printed circuit board is low due to the fact that the damping structure in the prior art cannot well protect the printed circuit board is solved.
Further, the second elastic backing ring and the elastic sleeve are integrally formed.
The beneficial effects are that: by the design, the number of parts can be reduced.
Further, the inner hole of the first elastic backing ring is matched with the outer peripheral surface of the elastic sleeve, and one end of the elastic sleeve, which is opposite to the second elastic backing ring, extends into the inner hole of the first elastic backing ring.
The beneficial effects are that: through the design, the first elastic backing ring, the second elastic backing ring and the elastic sleeve which are integrally formed are matched in an anastomotic mode, the axial direction and the radial direction of the printed circuit board are limited, the printed circuit board is elastically connected to the equipment shell, and the connection between the printed circuit board and the equipment shell is kept stable and reliable.
Further, a rubber gasket is arranged at one end of the first elastic backing ring, which is away from the second elastic backing ring, and/or one end of the second elastic backing ring, which is away from the first elastic backing ring, and the hardness of the rubber gasket is higher than that of the elastic buffer piece.
The beneficial effects are that: through the design, the clamping force generated by the fastener can be transmitted to the periphery of the elastic buffer piece by utilizing the elastic gasket with higher hardness, so that the clamping effect is improved.
Further, a metal washer is arranged at one end of the rubber gasket, which is away from the elastic buffer.
The beneficial effects are that: through the design, the clamping force generated by the fastener can be fully transmitted to the rubber gasket through the metal gasket, and then transmitted to the elastic buffer piece through the rubber gasket, so that the clamping area of the printed circuit board is increased, and meanwhile, the metal gasket is utilized to prevent loosening.
The technical scheme of the electric power protection secondary equipment is as follows:
the utility model provides an electric power protection secondary equipment, includes casing, printed circuit board and electric power protection secondary equipment shock-absorbing structure, electric power protection secondary equipment shock-absorbing structure includes elastic buffer spare and fastener, elastic buffer spare includes first elasticity backing ring, second elasticity backing ring and elastic sleeve, wherein first elasticity backing ring, second elasticity backing ring are used for setting up in the both sides of printed circuit board respectively, the elastic sleeve is used for passing the fixed connection hole of printed circuit board, the fastener passes first elasticity backing ring, second elasticity backing ring and elastic sleeve in order to press from both sides the printed circuit board between first elasticity backing ring and second elasticity backing ring, and separate printed circuit board and fastener through the elastic sleeve.
The beneficial effects are that: according to the electric power protection secondary equipment, the elastic buffer piece of the damping structure of the electric power protection secondary equipment is improved, the elastic buffer piece is designed to be the first elastic backing ring and the second elastic backing ring which are respectively arranged at two sides of the printed circuit board, and the elastic sleeve which penetrates through the fixed connection holes of the printed circuit board, so that the printed circuit board can be clamped between the first elastic backing ring and the second elastic backing ring by using the fastening piece, the fastening piece with higher hardness can be isolated from the printed circuit board by using the first elastic backing ring, the second elastic backing ring and the elastic sleeve, the damping structure can absorb axial vibration and radial vibration, the circuit board is protected, the service life of the circuit board is prolonged, and the electric power protection secondary equipment solves the technical problem that the damping structure in the electric power protection secondary equipment in the prior art cannot well protect the printed circuit board, and the service life of the printed circuit board is low.
Further, the second elastic backing ring and the elastic sleeve are integrally formed.
The beneficial effects are that: by the design, the number of parts can be reduced.
Further, the inner hole of the first elastic backing ring is matched with the outer peripheral surface of the elastic sleeve, and one end of the elastic sleeve, which is opposite to the second elastic backing ring, extends into the inner hole of the first elastic backing ring.
The beneficial effects are that: through the design, the first elastic backing ring, the second elastic backing ring and the elastic sleeve which are integrally formed are matched in an anastomotic mode, the axial direction and the radial direction of the printed circuit board are limited, the printed circuit board is elastically connected to the equipment shell, and the connection between the printed circuit board and the equipment shell is kept stable and reliable.
Further, a rubber gasket is arranged at one end of the first elastic backing ring, which is away from the second elastic backing ring, and/or one end of the second elastic backing ring, which is away from the first elastic backing ring, and the hardness of the rubber gasket is higher than that of the elastic buffer piece.
The beneficial effects are that: through the design, the clamping force generated by the fastener can be transmitted to the periphery of the elastic buffer piece by utilizing the elastic gasket with higher hardness, so that the clamping effect is improved.
Further, a metal washer is arranged at one end of the rubber gasket, which is away from the elastic buffer.
The beneficial effects are that: through the design, the clamping force generated by the fastener can be fully transmitted to the rubber gasket through the metal gasket, and then transmitted to the elastic buffer piece through the rubber gasket, so that the clamping area of the printed circuit board is increased, and meanwhile, the metal gasket is utilized to prevent loosening.
Drawings
FIG. 1 is a schematic diagram showing the assembly of a shock absorbing structure and a printed circuit board in an embodiment 1 of a secondary power protection device according to the present utility model;
FIG. 2 is a schematic view showing the internal structure of the shock absorbing structure in the direction A-A in FIG. 1.
Reference numerals illustrate:
1. a rubber gasket; 2. an elastic buffer member; 21. a first elastic backing ring; 22. a second elastic backing ring; 23. an elastic sleeve; 24. an elastic column; 3. a hexagon socket head cap screw; 4. a printed circuit board; 5. a metal gasket.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The terms "upper," "lower," "front," "rear," "left," "right," and the like refer to an orientation or positional relationship as if it were assumed, merely to facilitate description of the utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.
The features and capabilities of the present utility model are described in further detail below in connection with the examples.
according to the electric power protection secondary equipment, the fastening piece with high hardness can be isolated from the printed circuit board by using the first elastic backing ring, the second elastic backing ring and the elastic sleeve, so that the printed circuit board is protected while the damping structure absorbs axial vibration and radial vibration, and the service life of the printed circuit board is ensured.
As shown in fig. 1 and 2, the power protection secondary device (hereinafter referred to as secondary device) of the present utility model includes a housing (not shown), a printed circuit board 4 disposed inside the housing, and a power protection secondary device shock-absorbing structure (hereinafter referred to as shock-absorbing structure) disposed between the housing and the printed circuit board 4.
As shown in fig. 2, the printed circuit board 4 is provided with mounting through holes, and the shock absorbing structure is disposed at a corresponding position of the mounting through holes. The shock absorbing structure includes an elastic buffer 2 and a fastener, which in this embodiment is a hexagon socket head cap screw 3, and in other embodiments may be a bolt or the like.
The elastic buffer 2 comprises a first elastic backing ring 21, a second elastic backing ring 22 and an elastic sleeve 23, wherein the first elastic backing ring 21 and the second elastic backing ring 22 are respectively arranged on the upper side and the lower side of a mounting through hole of the printed circuit board 4, and the elastic sleeve 23 passes through the mounting through hole and is arranged between the first elastic backing ring 21 and the second elastic backing ring 22.
In this embodiment, the second elastic cushion ring 22 and the elastic sleeve 23 are of an integrally formed step structure, and the upper end of the elastic sleeve 23 extends out of the upper side surface of the printed circuit board 4, and a through hole adapted to the outer peripheral surface of the elastic sleeve 23 is formed in the first elastic cushion ring 21, so that the first elastic cushion ring 21 and the integrally formed second elastic cushion ring 22 and the elastic sleeve 23 are in fit engagement, and limit the axial direction and the radial direction of the printed circuit board 4, and further the printed circuit board 4 is elastically connected to the equipment casing, and the connection between the printed circuit board 4 and the equipment casing is kept stable and reliable.
Preferably, in the present embodiment, the elastic sleeve 23 and the second elastic backing ring 22 are internally provided with the elastic column 24, the elastic column 24 is provided with a through hole for the passing of the hexagon socket head cap screw 3 along the axial direction, the lower end of the elastic column 24 is propped against the rubber gasket 1 at the lower end, the upper end of the elastic column 24 is not higher than the compressed height of the elastic sleeve 23, and the hardness of the elastic column 24 is higher than that of the first elastic backing ring 21, the second elastic backing ring 22 and the elastic sleeve 23, so that the softer first elastic backing ring 21, the second elastic backing ring 22 and the elastic sleeve 23 can be used for contacting the printed circuit board 4, the harder elastic column 24 is used for contacting the hexagon socket head cap screw 3, different buffer layers are formed through hardness design, the buffer effect is improved, the reliability of the shock absorbing structure is improved, and meanwhile, the harder elastic column 24 can also facilitate the passing of the hexagon socket head cap screw 3, the installation and the cooperation with the hexagon socket head cap screw 3. In other embodiments, when the cushioning performance requirement is low, the elastic post 24 may not be provided, and the inner hole size of the elastic sleeve 23 and the through hole size of the second elastic backing ring 22 are adapted to the hexagon socket head cap screw 3.
In this embodiment, a rubber gasket 1 having a hardness higher than that of the elastic buffer member 2 is mounted on each of the upper end surface of the first elastic backing ring 21 and the lower end surface of the second elastic backing ring 22, and a metal gasket 5 is respectively provided on the upper end of the rubber gasket 1 at the upper end and the lower end of the rubber gasket 1 at the lower end.
The hexagon socket head cap screw 3 passes through the upper end metal washer 5, the upper end rubber washer 1, the first elastic washer 21, the inner hole of the elastic sleeve 23, the elastic column 24, the second elastic washer 22, the lower end rubber washer 1 and the lower end metal washer 5 in sequence from top to bottom, and the lower end of the hexagon socket head cap screw 3 extends out of the lower end metal washer 5 and is screwed on the fixed column on the bottom surface of the inner cavity of the shell. In this way, the printed circuit board 4 is clamped between the first elastic backing ring 21 and the second elastic backing ring 22 by the hexagon socket head cap screw 3 and each part of the shock absorbing structure is prevented from moving in the radial direction, and simultaneously the rubber gasket 1 and the metal gasket 5 can uniformly transfer the clamping force generated by the hexagon socket head cap screw 3 to the elastic buffer 2 and can increase the clamping area of the printed circuit board 4 and prevent loosening by the metal gasket 5.
Preferably, in the present embodiment, the metal washer 5 has the same size as the rubber washer 1, so that the clamping force applied by the hexagon socket head cap screw 3 can be more uniformly applied to the elastic buffer 2, and the clamping effect on the printed circuit board 4 can be improved.
As shown in fig. 1, in this embodiment, 6 mounting through holes adapted to the shock absorbing structure are provided on the printed circuit board 4, corresponding fixing columns are provided at corresponding positions on the bottom surface of the inner cavity of the housing, and a shock absorbing structure is provided between each fixing column and the printed circuit board 4, so as to construct a flexible shock absorbing installation environment for the printed circuit board 4, when an external shock acceleration is generated, after the shock is transmitted to the shock absorbing structure through the housing of the protection device, a part of energy can be absorbed through the shock absorbing structure, and the force generated by the rest energy can uniformly act on the 6 fixing columns, thereby realizing better shock absorption for the printed circuit board 4.
Meanwhile, the printed circuit board 4 can be clamped between the first elastic backing ring 21 and the second elastic backing ring 22 by using the fasteners, axial vibration can be absorbed, radial vibration can be absorbed by using the elastic sleeve 23, the printed circuit board 4 and the hexagon socket head cap screw 3 can be isolated in the axial direction by using the first elastic backing ring 21 and the second elastic backing ring 22, the printed circuit board 4 and the hexagon socket head cap screw 3 can be isolated in the radial direction by using the elastic sleeve 23, the vibration-absorbing structure can protect the circuit board while realizing the vibration absorption and buffering in the axial direction and the radial direction, the damage to the printed circuit board 4 caused by the collision of the printed circuit board 4 and the hexagon socket head cap screw 3 with higher hardness due to vibration is avoided, and the service life of the printed circuit board 4 is ensured.
In this embodiment, the mounting holes on the printed circuit board 4 are arranged along the vertical direction, and in other embodiments, the shock absorbing structure of the present utility model may also be applied to printed circuit boards 4 with different mounting positions, such as the mounting holes of the printed circuit board 4 are arranged along the horizontal direction, and the arrangement mode of the shock absorbing structure is adaptively adjusted according to the mounting position of the printed circuit board 4, and the specific adjustment mode is a conventional technical means in the art, which is not described herein.
In summary, the electric power protection secondary equipment of the utility model solves the technical problem that the shock absorption structure of the electric power protection secondary equipment in the prior art can not well protect the printed circuit board 4, resulting in the low service life of the printed circuit board 4.
The specific embodiment of the damping structure of the electric power protection secondary equipment comprises the following components: the embodiment of the damping structure of the power protection secondary device is the same as that of the power protection secondary device in the above embodiment, and will not be described herein.
The above description is only a preferred embodiment of the present utility model, and the patent protection scope of the present utility model is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The utility model provides an electric power protection secondary equipment shock-absorbing structure, a serial communication port, including elastic buffer (2) and fastener, elastic buffer (2) include first elasticity backing ring (21), second elasticity backing ring (22) and elastic sleeve (23), wherein first elasticity backing ring (21), second elasticity backing ring (22) are used for setting up in the both sides of printed circuit board (4) respectively, elastic sleeve (23) are used for passing the fixed connection hole of printed circuit board (4), the fastener passes first elasticity backing ring (21), second elasticity backing ring (22) and elastic sleeve (23) in order to press from both sides printed circuit board (4) tight between first elasticity backing ring (21) and second elasticity backing ring (22), and separate printed circuit board (4) and fastener through elastic sleeve (23).
2. The shock absorbing structure of a power protection secondary device according to claim 1, wherein the second elastic grommet (22) is integrally formed with the elastic sleeve (23).
3. The shock absorbing structure of the secondary power protection apparatus according to claim 2, wherein the inner hole of the first elastic backing ring (21) is matched with the outer circumferential surface of the elastic sleeve (23), and one end of the elastic sleeve (23) facing away from the second elastic backing ring (22) extends into the inner hole of the first elastic backing ring (21).
4. A shock absorbing structure for a secondary device for electric power protection as claimed in any one of claims 1 to 3, wherein a rubber gasket (1) is provided at one end of the first elastic grommet (21) facing away from the second elastic grommet (22) and/or one end of the second elastic grommet (22) facing away from the first elastic grommet (21), and the rubber gasket (1) has a higher hardness than the elastic cushion (2).
5. The shock absorbing structure of the power protection secondary equipment according to claim 4, wherein a metal gasket (5) is arranged at one end of the rubber gasket (1) facing away from the elastic buffer member (2).
6. The utility model provides an electric power protection secondary equipment, includes casing, printed circuit board (4) and electric power protection secondary equipment shock-absorbing structure, its characterized in that, electric power protection secondary equipment shock-absorbing structure includes elastic buffer (2) and fastener, elastic buffer (2) include first elastic backing ring (21), second elastic backing ring (22) and elastic sleeve (23), wherein first elastic backing ring (21), second elastic backing ring (22) are used for setting up in the both sides of printed circuit board (4) respectively, elastic sleeve (23) are used for passing the fixed connection hole of printed circuit board (4), fastener passes first elastic backing ring (21), second elastic backing ring (22) and elastic sleeve (23) in order to press from both sides printed circuit board (4) between first elastic backing ring (21) and second elastic backing ring (22), and separate printed circuit board (4) and fastener through elastic sleeve (23).
7. The secondary power protection apparatus as claimed in claim 6, wherein the second elastic grommet (22) is integrally formed with the elastic sleeve (23).
8. The secondary power protection apparatus as claimed in claim 7, wherein the inner hole of the first elastic grommet (21) is fitted with the outer peripheral surface of the elastic sleeve (23), and an end of the elastic sleeve (23) facing away from the second elastic grommet (22) extends into the inner hole of the first elastic grommet (21).
9. A secondary power protection apparatus according to any one of claims 6-8, characterized in that a rubber gasket (1) is provided at the end of the first elastic grommet (21) facing away from the second elastic grommet (22) and/or at the end of the second elastic grommet (22) facing away from the first elastic grommet (21), and in that the rubber gasket (1) has a higher hardness than the elastic buffer (2).
10. The secondary power protection apparatus as claimed in claim 9, wherein a metal washer (5) is provided at an end of the rubber gasket (1) facing away from the elastic buffer (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223032493.6U CN219119708U (en) | 2022-11-15 | 2022-11-15 | Shock-absorbing structure of electric power protection secondary equipment and electric power protection secondary equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223032493.6U CN219119708U (en) | 2022-11-15 | 2022-11-15 | Shock-absorbing structure of electric power protection secondary equipment and electric power protection secondary equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219119708U true CN219119708U (en) | 2023-06-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223032493.6U Active CN219119708U (en) | 2022-11-15 | 2022-11-15 | Shock-absorbing structure of electric power protection secondary equipment and electric power protection secondary equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219119708U (en) |
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2022
- 2022-11-15 CN CN202223032493.6U patent/CN219119708U/en active Active
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