CN210167528U - Circuit board connecting assembly, circuit board assembly and electronic product - Google Patents
Circuit board connecting assembly, circuit board assembly and electronic product Download PDFInfo
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- CN210167528U CN210167528U CN201920679085.9U CN201920679085U CN210167528U CN 210167528 U CN210167528 U CN 210167528U CN 201920679085 U CN201920679085 U CN 201920679085U CN 210167528 U CN210167528 U CN 210167528U
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Abstract
The utility model discloses a circuit board coupling assembling, circuit board assembly and electronic product, circuit board coupling assembling includes: the first connecting part comprises a first fixing part and an inserting part, the first fixing part is of a block-shaped structure and comprises a first fixing surface, a first limiting column is arranged on the first fixing surface, and the first limiting column is inserted into a limiting hole in the circuit board; the second connecting part comprises a second fixing part and an inserting groove, the second fixing part is blocky and comprises a second fixing surface, a second limiting column is arranged on the second fixing surface, and the second limiting column is inserted into a limiting hole in the circuit board. The utility model discloses a be provided with first spacing post and the spacing post of second on first connecting portion and second connecting portion, can carry on spacingly when making first connecting portion and second connecting portion be connected with the circuit board, at circuit board coupling assembling plug in-process, spacing post bearing stress to improve the reliability that first connecting portion and second connecting portion are connected with the circuit board.
Description
Technical Field
The utility model relates to a circuit board correlation technique field, especially a circuit board coupling assembling, circuit board assembly and electronic product.
Background
At present, in some occasions, a plurality of circuit boards are required to be butted for use, for example, in an interactive screen, an infrared touch circuit board is formed by butting a plurality of circuit boards. The currently common plate-to-plate connections are generally two methods: one is to adopt the row needle to dock with the row female connector; and the second mode is to adopt FPC wires for butt joint. Both of these connection methods have certain drawbacks: the pin header and the female header connector are not foolproof, the risk of butt joint dislocation exists, and in addition, the connector has no stress supporting point, so that the PCB welding point is easily damaged; and the FFC wire connection is used, so that the assembly operation is complicated and the production is not facilitated.
SUMMERY OF THE UTILITY MODEL
Based on the above-mentioned current situation, the utility model discloses a main aim at provides circuit board coupling assembling, circuit board components and electronic product easy to assemble, that the reliability is high.
In order to achieve the above object, the utility model adopts the following technical scheme:
in a first aspect, the utility model provides a circuit board connecting assembly, include: the first connecting part and the second connecting part are respectively used for being arranged on two circuit boards to be connected;
the first connecting part comprises a first fixing part and an inserting part, the first fixing part is of a block-shaped structure and comprises a first fixing surface and a first end surface, a first limiting column is arranged on the first fixing surface, the first fixing surface is attached to the circuit board, the first limiting column is inserted into a limiting hole on the circuit board,
the inserting part is of a sheet structure and is arranged on the first end face in a manner of being vertical to the first end face;
the second connecting part comprises a second fixing part and an inserting groove, the second fixing part is in a block shape and comprises a second fixing surface and a second end surface, a second limiting column is arranged on the second fixing surface, the second fixing surface is attached to the circuit board, the second limiting column is inserted into a limiting hole on the circuit board,
the inserting groove is an inward concave structure formed by forming an opening on the second end face and extending towards the inside of the second fixing part along the direction vertical to the second end face;
the plug part and the plug groove are respectively provided with an electric connection structure, the plug part is inserted into the plug groove, and the electric connection structure on the plug part is electrically connected with the electric connection structure in the plug groove.
Preferably, the electric connection structure on the inserting part comprises inserting pieces, the inserting pieces are attached to the inserting part and extend in the direction vertical to the first end face, the number of the inserting pieces is multiple, and the inserting pieces are distributed on the upper side face and the lower side face of the inserting part.
Preferably, the inserting part is provided with a fixture block which is a convex structure formed on the inserting part,
a clamping groove is arranged in the inserting groove, the clamping groove is a groove formed on the inner wall of the inserting groove,
when the inserting part is inserted into the inserting groove, the clamping block is positioned in the clamping groove.
Preferably, the electrical connection structure in the insertion groove comprises a plurality of abutting pieces, the abutting pieces abut against the corresponding insertion pieces when the insertion part is inserted into the insertion groove, and the plurality of abutting pieces are distributed on the upper and lower side walls of the insertion groove.
Preferably, a chamfer for guiding the insertion of the insertion part is formed at an opening of the insertion groove.
Preferably, the first fixing part is provided with a first fixing foot, and the first fixing foot is arranged on the first fixing surface and is flush with the first fixing surface;
the first fixing part is provided with a first avoidance part, the first avoidance part is formed by inwards sinking the first fixing part, and the first fixing foot is exposed from the first avoidance part.
Preferably, a second fixing leg is arranged on the second fixing part, and the second fixing leg is arranged on the second fixing surface and is flush with the second fixing surface;
the second fixing part is provided with a second avoiding part, the second avoiding part is formed by inwards concave parts on the second fixing part, and the second fixing foot is exposed from the second avoiding part.
Preferably, the first fixing pin or the second fixing pin is configured as a metal sheet structure and is fixed on the circuit board by welding.
In a second aspect, the present invention provides a circuit board assembly, including two at least circuit boards, adjacent two, connected together the circuit boards are connected through the above circuit board connection assembly.
Preferably, the circuit board assembly is a circuit board assembly within an interactive display device.
Preferably, the circuit board assembly is an infrared touch circuit board assembly disposed in an infrared touch screen.
In a third aspect, an electronic product is provided, which includes the circuit board assembly.
Preferably, the electronic product is an infrared touch screen, and the circuit board assembly comprises an infrared touch circuit board assembly.
The utility model provides a circuit board coupling assembling can carry on spacingly when making first connecting portion and second connecting portion be connected with the circuit board through being provided with first spacing post and the spacing post of second on first connecting portion and second connecting portion, at circuit board coupling assembling plug in-process, by first spacing post and the spacing post bearing stress of second to improve the reliability that first connecting portion and second connecting portion are connected with the circuit board.
Drawings
Preferred embodiments of a circuit board connection assembly according to the present invention will be described below with reference to the accompanying drawings. In the figure:
fig. 1 is a schematic view illustrating an assembled state of a circuit board connecting assembly according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural view of a first connection portion of a circuit board connection assembly according to the present invention;
fig. 3 is a schematic structural diagram of a second connecting portion of the circuit board connecting assembly according to the present invention.
Detailed Description
To solve the problem of inconvenient installation and operation in the prior art, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, fig. 2 and fig. 3, the utility model provides a circuit board connection assembly includes first connecting portion 100 and second connecting portion 200, first connecting portion 100 and second connecting portion 200 are connected to two circuit boards respectively on, be provided with grafting portion 120 on the first connecting portion 100, be provided with inserting groove 220 on the second connecting portion 200, on the grafting portion 120 with all be provided with electrical connection structure in inserting groove 220, first connecting portion 100 and second connecting portion 200 are connected through the mode of pegging graft, on the grafting portion 120 with electrical connection structure in inserting groove 220 realizes the electricity and connects to realize the electricity of two circuit boards.
As shown in fig. 2, the first connecting portion 100 includes a first fixing portion 110 and a plugging portion 120, the plugging portion 120 is disposed on the first fixing portion 110 and is used for being plugged with the second connecting portion 200, and the first fixing portion 110 is used for being fixedly connected with a first circuit board.
The first fixing portion 110 is preferably configured as a block structure, for example, a block structure in the present embodiment, and includes a first fixing surface 111 contacting the first circuit board, a first end surface 112 provided with a plugging portion 120, and a first side surface 113, where the first fixing surface 111 is perpendicular to the first end surface 112, the first side surface 113 is perpendicular to both the first fixing surface 111 and the first end surface 112, and two first side surfaces 113 are arranged in parallel to each other. A first solder leg 114 electrically connected to the first circuit board is disposed on the first fixing portion 110, and the first solder leg 114 extends from the inside of the first fixing portion 110, is connected to the first circuit board by soldering, and is electrically connected to the first circuit board. The first solder feet 114 are provided in a plurality, preferably, a plurality of the first solder feet 114 are arranged side by side, and a certain distance, preferably 0.4-0.6mm, for example 0.5mm, is arranged between two adjacent first solder feet 114, and the distance between two adjacent first solder feet 114 is smaller so that the width of the first fixing portion 110 can be reduced. Be provided with first spacing post 115 on the first fixed part 110, first spacing post 115 forms on the first fixed surface 111, and along with first fixed surface 111 vertically direction extends, be provided with spacing hole on the first circuit board, first fixed part 110 is installed when on the first circuit board, first fixed surface 111 is laminated on the first circuit board, first spacing post 115 inserts in the spacing hole on the first circuit board, in order with make in the direction that the first circuit board is parallel first fixed part 110 can not with relative movement takes place for the first circuit board. Preferably, the first stopper column 115 is configured as a cylindrical structure, and one or two or more first stopper columns 115 are provided.
The first fixing portion 110 may be fixed to the first circuit board by means of adhesion, that is, the first fixing surface 111 is adhered to the first circuit board, so as to realize the fixed connection between the first fixing portion 110 and the first circuit board. Or, in this embodiment, preferably, the first fixing portion 110 is further provided with a first fixing pin 116, and the first fixing pin 116 is used for being fixedly connected with the first circuit board to fix the first fixing portion 110 to the first circuit board. Preferably, the first fixing leg 116 is a metal sheet structure, a part of the first fixing leg 116 is embedded inside the first fixing portion 110 and fixed inside the first fixing portion 110, another part of the first fixing leg 116 is exposed outside the first fixing portion 110, and the part exposed outside the first fixing portion 110 is fixed to the first circuit board by soldering. Preferably, the first fixing leg 116 extends from the first side surface 113, or the first fixing leg 116 extends from the first fixing surface 111 and is flush with the first fixing surface 111 of the first fixing portion 110, and when the first fixing surface 111 is attached to the first circuit board, the first fixing leg 116 is attached to the first circuit board. In order to facilitate the soldering of the first fixing leg 116, the first fixing leg 116 extends toward the edge of the first fixing surface 111, a first avoiding portion 117 is formed at a position where the first fixing surface 111 and the first side surface 113 intersect, the first avoiding portion 117 is formed on the first fixing portion 110 in a concave manner, and notches are formed on both the first fixing surface 111 and the first side surface 113, so that the first fixing leg 116 can be exposed through the first avoiding portion 117 when the first fixing surface 111 is attached to the first circuit board, and the first fixing leg 116 is soldered to the first circuit board by operating at the notch formed on the first side surface 113. Preferably, two first fixing legs 116 are provided, two first fixing legs 116 are formed at positions close to the two first side surfaces 113, and the first escape portion 117 is formed at a position close to the first fixing legs 116.
The insertion part 120 is disposed on the first end surface 112 of the first fixing part 110, and the insertion part 120 is configured as a sheet structure disposed perpendicular to the first end surface. The electrical connection structure on the plug part 120 includes a tab 121, and the tab 121 is electrically connected to the first solder leg 114, so that the tab 121 can be electrically connected to the first circuit board through the first solder leg 114, and preferably, the tab 121 is electrically connected to the first solder leg 114 inside the first fixing part 110.
The insert piece 121 is attached to the inserting part 120 and extends along a direction perpendicular to the first end surface 112, preferably to an end of the inserting part 120 away from the first fixing part 110. The inserting pieces 121 are provided with a plurality of inserting pieces 121, the inserting pieces 121 are in one-to-one correspondence with the first welding feet 114, and the inserting pieces 121 are arranged in parallel at a certain interval. Preferably, the insertion pieces 121 are arranged on the upper surface and the lower surface of the insertion part 120 parallel to the first fixing surface, so that the area for arranging the insertion pieces 121 is increased, the distance between two adjacent insertion pieces 121 can be larger, preferably, the distance between two insertion pieces 121 is 0.8-1.2mm, for example, 1.0mm, and the larger distance between the insertion pieces 121 can avoid or reduce the situation of dislocation and short circuit during insertion.
Preferably, the side surface of the insertion part 120 is provided with two latch blocks 122, the latch blocks 122 are configured as a protruding structure formed on the side surface of the insertion part 120, the positions of the two latch blocks 122 corresponding to each other on the two opposite side surfaces of the insertion part 120 are provided with two latch blocks, and the latch blocks 122 are used for being latched with the second connection part 200, so that the insertion part 120 can be pulled out only under the action of a certain external force when being inserted into the second connection part 200.
As shown in fig. 3, the second connecting portion 200 includes a second fixing portion 210, the second fixing portion 210 is configured as a block structure having the same structure as the first fixing portion 110, and includes a second fixing surface 211, a second end surface 212, and a second side surface 213, the second fixing surface 211 is perpendicular to the second end surface 212, the second side surface 213 is perpendicular to both the second fixing surface 211 and the second end surface 212, and two second side surfaces 213 are disposed parallel to each other. A second solder leg 214 electrically connected to the second circuit board is disposed on the second fixing portion 210, and the second solder leg 214 extends from the inside of the second fixing portion 210, is connected to the second circuit board by soldering, and is electrically connected to the second circuit board. The second solder tail 214 is provided in plural, and the number of the second solder tails 214 is the same as that of the first solder tails 114. Preferably, a plurality of the second solder tails 214 are arranged side by side, and a certain distance is spaced between two adjacent second solder tails 214, preferably 0.4-0.6mm, for example 0.5mm, and the spacing between two adjacent second solder tails 214 is smaller so that the width of the second fixing portion 110 can be reduced.
Be provided with spacing post 215 of second on the second fixed part 210, spacing post 215 of second forms on the second fixed part 211, and along with the second fixed part 211 vertically direction extends, be provided with spacing hole on the second circuit board, second fixed part 210 is installed when on the second circuit board, the second fixed part 211 laminates on the second circuit board, spacing post 215 of second inserts in the spacing hole on the second circuit board, in order with make in the direction that the second circuit board is parallel the second fixed part 210 can not with relative movement takes place for the second circuit board. Preferably, the second restraining post 215 is configured as a cylindrical structure, and one or two or more second restraining posts 215 are provided.
The second fixing portion 210 may be fixed to the second circuit board by means of adhesion, that is, the second fixing surface 211 is adhered to the second circuit board, so as to realize the fixed connection between the second fixing portion 210 and the second circuit board. Or, in this embodiment, preferably, a second fixing pin 216 is further disposed on the second fixing portion 210, and the second fixing pin 216 is used for being fixedly connected with the second circuit board to fix the second fixing portion 210 to the second circuit board. Preferably, the second fixing leg 216 is a metal sheet structure, a part of the second fixing leg 216 is embedded in the second fixing portion 210 and fixed in the second fixing portion 210, another part of the second fixing leg 216 is exposed to the outside of the second fixing portion 210, and the part exposed to the outside of the second fixing portion 210 is fixed to the second circuit board by soldering. Preferably, the second fixing leg 216 extends from the second side surface 213, or the second fixing leg 216 extends from the second fixing surface 211 and is flush with the second fixing surface 211 of the second fixing portion 210, and when the second fixing surface 211 is attached to the second circuit board, the second fixing leg 216 is attached to the second circuit board. In order to facilitate the welding of the second fixing leg 216, the second fixing leg 216 extends toward the edge of the second fixing surface 211, a second avoiding portion 217 is formed at a position where the second fixing surface 211 and the second side surface 213 intersect, the second avoiding portion 217 is formed in the second fixing portion 210 in an inward concave manner, and notches are formed in both the second fixing surface 211 and the second side surface 213, so that the second fixing leg 216 can be exposed through the second avoiding portion 217 when the second fixing surface 211 is attached to the second circuit board, and the second fixing leg 216 is welded to the second circuit board by performing an operation at the notch formed in the second side surface 213. Preferably, two second fixing legs 216 are provided, two second fixing legs 216 are formed at positions close to the two second side surfaces 213, and the second escape portion 217 is formed at a position close to the second fixing legs 216.
The second fixing portion 210 is provided with an insertion groove 220, the insertion groove 220 is an inward concave structure formed by forming an opening on the second end surface 212 and extending towards the inside of the second fixing portion 210 along a direction perpendicular to the second end surface 212, and the insertion portion 120 can be inserted into the insertion groove 220. The electrical connection structure in the insertion slot 220 includes abutting pieces 221, the number and the positions of the abutting pieces 221 correspond to those of the insertion pieces 121, that is, each insertion piece 121 contacts with one abutting piece 221 and realizes electrical connection. Preferably, the abutting piece 221 has elasticity, and when the inserting part 120 is inserted into the inserting groove 220, the abutting piece 221 abuts on the inserting piece 121 and is elastically deformed by a certain amount under the pressing action of the inserting piece 121, so that the abutting piece is more reliably contacted with the inserting piece 121. Preferably, the abutting pieces 221 are disposed on upper and lower sidewalls of the insertion groove 220 parallel to the second fixing surface 221.
A chamfer is formed at the opening of the insertion groove 220 along the edge of the opening to enlarge the opening of the insertion groove 220 and guide the insertion of the insertion part 120. A clamping groove (not shown) is formed in an inner wall of the insertion groove 220, and when the insertion part 120 is inserted into the insertion groove 220, a clamping block 222 on the insertion part 220 is clamped into the clamping groove, so that the insertion part 120 can be held in the insertion groove 220. When the inserting part 120 is completely inserted into the inserting groove 220, the first end surface 111 and the second end surface 211 are attached.
The utility model also provides a circuit board assembly, including two at least circuit boards that link together, two adjacent circuit boards pass through circuit board coupling assembling connects, is provided with first connecting portion 100 and second connecting portion 200 on two adjacent circuit boards respectively promptly, and grafting through first connecting portion 100 and second connecting portion 200 realizes the connection of two circuit boards. Preferably, when the circuit board is provided with more than two, the two circuit boards at two ends are respectively provided with the first connecting portion 100 and the second connecting portion 200, and the two connecting portions of the circuit board at the middle part are respectively provided with the first connecting portion 100 and the second connecting portion 200, that is, the circuit board at the middle part is simultaneously provided with the first connecting portion 100 and the second connecting portion 200.
Preferably, after the first connecting portion 100 and the second connecting portion 200 are plugged, the first end surface 112 and the second end surface 212 are attached to each other, so that the size of the circuit board assembly after connection can be determined, and when the size of the circuit board assembly after connection is larger than the set size, it indicates that at least one circuit board connection assembly is not connected in place, that is, the plugging portion 120 of the first connecting portion 100 is not completely inserted into the plugging groove 220 of the second connecting portion 200, and at this time, it is necessary to check in time to avoid occurrence of poor contact. Therefore, the circuit board connecting assembly also has the function of avoiding the situation that the connection is not in place or the connection is loosened.
The circuit board assembly is preferably a circuit board assembly in an interactive display device, the interactive display device comprises a touch screen, and the circuit board assembly is the circuit board assembly in the touch screen. Preferably, the interactive display device is an interactive screen, or other display devices including a touch screen, such as a touch all-in-one machine, an electronic interactive blackboard, an electronic interactive whiteboard, a multimedia large screen, a touch flat-panel television, an intelligent interactive flat panel, and the like.
Further, the circuit board assembly is preferably an infrared touch circuit board assembly, and the infrared touch circuit board assembly is used for an infrared touch screen.
The utility model also provides an electronic product, be provided with above-mentioned circuit board assembly in the electronic product, electronic product is preferred including infrared touch screen, infrared touch screen includes above-mentioned circuit board assembly, circuit board assembly is infrared touch circuit board assembly. Preferably, the electronic product is a touch all-in-one machine, an electronic interactive blackboard, an electronic interactive whiteboard, a multimedia large screen, a touch panel television, an intelligent interactive panel or an interactive display screen.
It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
It will be understood that the above-described embodiments are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions may be made in the details described herein by those skilled in the art without departing from the basic principles of the invention.
Claims (14)
1. A circuit board connection assembly, comprising: the first connecting part and the second connecting part are respectively used for being arranged on two circuit boards to be connected;
the first connecting part comprises a first fixing part and an inserting part, the first fixing part is of a block-shaped structure and comprises a first fixing surface and a first end surface, a first limiting column is arranged on the first fixing surface, the first fixing surface is attached to the circuit board, the first limiting column is inserted into a limiting hole on the circuit board,
the inserting part is of a sheet structure and is arranged on the first end face in a manner of being vertical to the first end face;
the second connecting part comprises a second fixing part and an inserting groove, the second fixing part is in a block shape and comprises a second fixing surface and a second end surface, a second limiting column is arranged on the second fixing surface, the second fixing surface is attached to the circuit board, the second limiting column is inserted into a limiting hole on the circuit board,
the inserting groove is an inward concave structure formed by forming an opening on the second end face and extending towards the inside of the second fixing part along the direction vertical to the second end face;
the plug part and the plug groove are respectively provided with an electric connection structure, the plug part is inserted into the plug groove, and the electric connection structure on the plug part is electrically connected with the electric connection structure in the plug groove.
2. The circuit board connection assembly of claim 1, wherein the electrical connection structure on the insertion part comprises a plurality of insertion pieces, the insertion pieces are attached to the insertion part and extend in a direction perpendicular to the first end face, and the plurality of insertion pieces are distributed on the upper side face and the lower side face of the insertion part.
3. The circuit board connecting assembly according to claim 2, wherein the insertion part is provided with a locking piece, the locking piece is a protruding structure formed on the insertion part,
a clamping groove is arranged in the inserting groove, the clamping groove is a groove formed on the inner wall of the inserting groove,
when the inserting part is inserted into the inserting groove, the clamping block is positioned in the clamping groove.
4. The circuit board connecting assembly according to claim 2, wherein the electrical connection structure in the insertion groove includes a plurality of abutting pieces, the abutting pieces abut against the corresponding insertion pieces when the insertion part is inserted into the insertion groove, and the plurality of abutting pieces are distributed on the upper and lower side walls of the insertion groove.
5. The circuit board connection module according to claim 1, wherein a chamfer for guiding insertion of the insertion portion is formed at an opening of the insertion groove.
6. The circuit board connection assembly according to claim 1, wherein the first fixing portion is provided with a first fixing pin, and the first fixing pin is provided on the first fixing surface and flush with the first fixing surface;
the first fixing part is provided with a first avoidance part, the first avoidance part is formed by inwards sinking the first fixing part, and the first fixing foot is exposed from the first avoidance part.
7. The circuit board connection assembly according to claim 1, wherein a second fixing pin is provided on the second fixing portion, and the second fixing pin is provided on the second fixing surface and flush with the second fixing surface;
the second fixing part is provided with a second avoiding part, the second avoiding part is formed by inwards concave parts on the second fixing part, and the second fixing foot is exposed from the second avoiding part.
8. The circuit board connection assembly of claim 6, wherein the first securing leg is configured as a metal sheet structure secured to the circuit board by soldering.
9. The circuit board connection assembly of claim 7, wherein the second securing leg is configured as a metal sheet structure secured to the circuit board by soldering.
10. A circuit board assembly comprising at least two circuit boards connected together, wherein adjacent two of said circuit boards are connected by a circuit board connection assembly as claimed in any one of claims 1 to 9.
11. The circuit board assembly of claim 10, wherein the circuit board assembly is a circuit board assembly within an interactive display device.
12. The circuit board assembly of claim 10, wherein the circuit board assembly is an infrared touch circuit board assembly disposed within an infrared touch screen.
13. An electronic product comprising the circuit board assembly of claim 10.
14. The electronic product of claim 13, wherein the electronic product comprises an infrared touch screen, and the circuit board assembly is an infrared touch circuit board assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920679085.9U CN210167528U (en) | 2019-05-13 | 2019-05-13 | Circuit board connecting assembly, circuit board assembly and electronic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920679085.9U CN210167528U (en) | 2019-05-13 | 2019-05-13 | Circuit board connecting assembly, circuit board assembly and electronic product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210167528U true CN210167528U (en) | 2020-03-20 |
Family
ID=69790742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920679085.9U Active CN210167528U (en) | 2019-05-13 | 2019-05-13 | Circuit board connecting assembly, circuit board assembly and electronic product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210167528U (en) |
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2019
- 2019-05-13 CN CN201920679085.9U patent/CN210167528U/en active Active
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