CN220971035U - Get rid of many balls and put - Google Patents
Get rid of many balls and put Download PDFInfo
- Publication number
- CN220971035U CN220971035U CN202322822742.XU CN202322822742U CN220971035U CN 220971035 U CN220971035 U CN 220971035U CN 202322822742 U CN202322822742 U CN 202322822742U CN 220971035 U CN220971035 U CN 220971035U
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- ball
- suction head
- vacuum suction
- frame
- vacuum
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- 230000007246 mechanism Effects 0.000 claims abstract description 65
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 47
- 239000010959 steel Substances 0.000 claims abstract description 47
- 229910000679 solder Inorganic materials 0.000 claims description 26
- 238000011084 recovery Methods 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 21
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 238000001179 sorption measurement Methods 0.000 abstract description 7
- 238000002513 implantation Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000003828 vacuum filtration Methods 0.000 description 1
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- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
The utility model discloses a device for removing multiple balls, which comprises a fixed frame, a movable frame and a ball planting mechanism, wherein the movable frame and the ball planting mechanism are transversely arranged and are assembled on the fixed frame in a sliding manner, and a steel mesh is paved on the fixed frame; the movable frame is provided with a vacuum suction head in a lifting manner, and the vacuum suction head, the movable frame and the ball planting mechanism are all positioned above the steel mesh; the vacuum suction head is in a strip structure and extends along the width direction of the steel mesh, a feed inlet of the vacuum suction head is arranged downwards, and a discharge outlet of the vacuum suction head is arranged at the middle upper part of the vacuum suction head and is connected with the feed inlet of the vacuum generating mechanism. According to the utility model, the manual ball removing step is replaced by vacuum adsorption, so that the working efficiency is improved; the vacuum suction head effectively adsorbs redundant tin balls on the steel mesh in a vacuum manner and does not contact with normal tin balls, so that other good products are prevented from being damaged, the process quality is improved, and the overall ball planting yield is improved; different ball removing heights are adjusted through lifting the vacuum suction head, and the vacuum adsorption force is adjusted through the vacuum generating mechanism, so that tin balls with different sizes are adapted.
Description
Technical Field
The utility model relates to the technical field of tin ball planting, in particular to a multi-ball removing device.
Background
The wafer type mini-ball mounting process comprises the following steps: aligning the position of the wafer supplied from the loading port with the printing stencil and then printing the flux after image recognition; after printing the soldering flux, positioning through a wafer and a ball mounting template, and then mounting a tin ball; after completion, the mounting template is released and the wafer is stored in the load port mold. When the solder balls are planted, the steel mesh is attached to the corresponding wafer; under the action of the brush or other carriers, the solder balls leak from the meshes of the ball-planting steel net and are adhered to the wafer.
Because of the setting of the meshes of the steel mesh and the requirements of the process, each mesh can just fall into one tin ball. In order to ensure that the meshes on the steel mesh are all occupied by tin balls, the number of tin balls placed on the steel mesh is far greater than the number of corresponding steel mesh meshes. Therefore, after the solder ball implantation is finished, more solder balls remain on the screen plate. If the redundant solder balls on the steel mesh cannot be thoroughly removed, the solder balls can fall on the wafer along with the steel mesh during demolding, so that the yield of ball implantation of the wafer is reduced.
In the prior art, the mode of removing the redundant tin balls on the steel mesh is manual removal of the tin balls, namely manual removal of the tin balls. However, in the face of solder balls with too small specification, especially solder balls which are difficult to observe by naked eyes, excessive solder balls are difficult to be removed effectively and thoroughly by hand, a steel net is polluted, and the ball removing efficiency is too low; in the manual ball removal process, normal solder balls arranged in meshes of the steel mesh can be contacted, and further other good products are damaged.
Disclosure of utility model
The utility model aims to provide a device for removing multiple balls, which can realize automatic ball removal without contacting with normal solder balls, improve the yield of integral ball implantation, improve the ball removal efficiency and is suitable for solder balls with different sizes.
The aim of the utility model can be achieved by the following technical scheme:
The utility model provides a get rid of many balls device, includes mount, movable frame and planting ball mechanism, the movable frame with planting ball mechanism transversely sets up and respectively through corresponding slide rail along the length direction sliding assembly of mount is on the mount, the steel mesh has been laid on the mount, the movable frame with planting ball mechanism all is located the top of steel mesh;
The front side or the rear side of the movable frame is provided with a vacuum suction head in a lifting manner; the vacuum suction head is in a strip-shaped structure and extends along the width direction of the steel mesh, the vacuum suction head is positioned above the steel mesh, a feed inlet of the vacuum suction head is arranged downwards, and a discharge outlet of the vacuum suction head is arranged at the middle upper part of the vacuum suction head and is connected with the feed inlet of the vacuum generating mechanism.
As a further scheme of the utility model: the distance between the bottom of the vacuum suction head and the surface of the steel mesh is 2 mm-4 mm.
As a further scheme of the utility model: the vacuum suction head is lifted by a lifting mechanism; the lifting mechanism is fixed on the movable frame and distributed at the left end and the right end of the vacuum suction head, and the vacuum suction head is connected with the lifting mechanism through the connecting frame.
As a further scheme of the utility model: the lifting mechanism comprises an auxiliary guide rail and a lifting motor, wherein the auxiliary guide rail and the lifting motor are matched with the connecting frame, the auxiliary guide rail is vertically fixed on the movable frame and distributed at the left end and the right end of the vacuum suction head, and the connecting frame is driven by the lifting motor to lift on the auxiliary guide rail.
As a further scheme of the utility model: the connecting frame is L-shaped, a vertical side plate of the connecting frame is assembled on the lifting mechanism, and a horizontal bottom plate of the connecting frame is provided with a U-shaped clamping groove; the top of the vacuum suction head is detachably connected with the U-shaped clamping groove through a T-shaped screw; and the vacuum suction head and the horizontal bottom plate are limited through a locating pin.
As a further scheme of the utility model: the movable frame is also provided with an air channel block, the side wall of the air channel block is provided with a plurality of inlets, the top of the air channel block is provided with an outlet, and the outlet of the air channel block is connected with a feed inlet of the vacuum generating mechanism through a pipeline;
The middle upper part of the vacuum suction head is provided with a plurality of pipeline joints at intervals, and a feed inlet of each pipeline joint is communicated with an inner cavity of the vacuum suction head; and a discharge hole of the pipeline joint is communicated with an inlet corresponding to the air passage block through a connecting pipe.
As a further scheme of the utility model: and a discharge hole of the vacuum generating mechanism is provided with a solder ball recovery device for recovering solder balls.
As a further scheme of the utility model: the ball planting mechanism comprises a mounting frame, a supporting seat, a ball supply bin and a brush;
The mounting frame is transversely arranged and is assembled on the fixing frame in a sliding manner along the length direction of the fixing frame through corresponding sliding rails;
the supporting seat is assembled on the mounting frame in a sliding manner along the length direction of the mounting frame;
The ball supply bin is fixed at the middle upper part of the supporting seat, a ball inlet of the ball supply bin is arranged at the top end of the ball supply bin, and a ball outlet of the ball supply bin is arranged at the bottom end of the ball supply bin;
the hairbrush is assembled at the bottom of the ball supply bin, and is annularly arranged outside the ball outlet of the ball supply bin.
As a further scheme of the utility model: the moving speed of the movable frame sliding along the length direction of the fixed frame is 40 mm/s-130 mm/s.
As a further scheme of the utility model: the advancing speed of the ball planting mechanism sliding along the length direction of the fixing frame is 10 mm/s-160 mm/s.
The utility model has the beneficial effects that the vacuum adsorption replaces the manual ball removing step, so that the working efficiency is improved; the redundant tin balls on the steel mesh are effectively adsorbed by the vacuum suction head in a vacuum way and are not contacted with normal tin balls, so that other good products are prevented from being damaged, the process quality is improved, and the overall ball planting yield is improved; the vacuum adsorption force is adjusted through the vacuum generating mechanism, and different ball removing heights are adjusted through lifting the vacuum suction head, so that the solder balls with different sizes are adapted.
Drawings
The utility model is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic view of a partial structure of the present utility model;
FIG. 2 is a schematic diagram of the structure of the present utility model;
FIG. 3 is a partial schematic view (II) of the present utility model;
FIG. 4 is a schematic view of a partial structure of the present utility model;
FIG. 5 is a schematic view of a vacuum cleaner head of the present utility model;
FIG. 6 is a schematic view of the vacuum cleaner head and the connector of the present utility model.
Wherein the reference numerals are as follows:
1. A fixing frame; 2. a movable frame; 3. a vacuum suction head; 31. a T-shaped screw; 32. a positioning pin; 4. a connecting frame; 41. a U-shaped clamping groove; 5. a lifting mechanism; 51. an auxiliary guide rail; 52. a lifting motor; 6. the air path block; 7. a pipe joint; 8. a steel mesh; 9. a ball planting mechanism; 91. a mounting frame; 92. a support base; 93. a ball supply bin; 94. a brush.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
Referring to fig. 1-2, a device for removing multiple balls according to an exemplary embodiment of the present utility model includes a fixed frame 1, a movable frame 2, and a ball planting mechanism 9. Wherein, the movable frame 2 and the ball planting mechanism 9 are transversely arranged and are respectively assembled on the fixed frame 1 in a sliding way along the length direction of the fixed frame 1 through corresponding sliding rails. The steel mesh 8 is paved on the fixed frame 1, and the movable frame 2 and the ball planting mechanism 9 are both positioned above the steel mesh 8.
Specifically, the sliding movement is along the length direction of the fixing frame 1, i.e. the sliding movement is forward and backward along the fixing frame 1. The movable frame 2 is a portal frame, a first sliding rail matched with the movable frame 2 is arranged at the top of the fixed frame 1, and the first sliding rails are distributed on two sides of the outer part of the steel mesh 8. The first sliding rail is provided with a first motor, and the first motor drives the movable frame 2 to move back and forth along the fixed frame 1 on the first sliding rail through the screw rod. The moving speed of the movable frame 2 sliding along the length direction of the fixed frame 1 is 40 mm/s-130 mm/s. Preferably, the traveling speed of the movable frame 2 sliding along the length direction of the fixed frame 1 is 50mm/s to 120mm/s.
In addition, the top of mount 1 still is equipped with the second slide rail that matches with planting ball mechanism 9, and the second slide rail distributes in the outside both sides of steel mesh 8 and is located the inboard or the outside of first slide rail. The second sliding rail is provided with a second motor, and the second motor drives the ball planting mechanism 9 to move back and forth along the fixing frame 1 on the second sliding rail through a screw rod. The traveling speed of the ball planting mechanism 9 sliding along the length direction of the fixing frame 1 is 10 mm/s-160 mm/s.
Referring to fig. 1 and 3, the movable frame 2 is provided with a vacuum cleaner head 3 on a front or rear side thereof in a liftable manner. The vacuum suction head 3 is in a strip structure and extends along the width direction of the steel mesh 8, the vacuum suction head 3 is positioned above the steel mesh 8, a feed inlet of the vacuum suction head is downwards arranged, and a discharge outlet of the vacuum suction head 3 is arranged at the middle upper part of the vacuum suction head and is connected with the feed inlet of the vacuum generating mechanism. The vacuum generating mechanism is arranged outside the fixed frame 1 and the movable frame 2 and beside the fixed frame 1. The vacuum generating mechanism is communicated with the vacuum suction head 3 through an air pipe. Specifically, the length of the discharge hole of the vacuum suction head 3 is greater than or equal to the width of the steel mesh 8, and then when the movable frame 2 moves back and forth along the fixed frame 1, the discharge hole of the vacuum suction head 3 effectively covers the steel mesh 8, so that the situation that local redundant tin balls on the steel mesh 8 are not adsorbed by vacuum is avoided. When the vacuum suction head 3 performs vacuum suction, the distance between the vacuum suction head 3 and the surface of the steel mesh 8 is 2 mm-4 mm. Preferably, the distance between the vacuum nozzle 3 and the top of the steel mesh 8 is 2mm.
Referring to fig. 4, the vacuum suction head 3 is lifted by a lifting mechanism 5; the lifting mechanism 5 is fixed on the movable frame 2 and distributed at the left end and the right end of the vacuum suction head 3, and the vacuum suction head 3 is connected with the lifting mechanism 5 through the connecting frame 4. Specifically, the lifting mechanism 5 includes an auxiliary rail 51 and a lifting motor 52 that match the link 4. The auxiliary guide rail 51 is vertically fixed to the movable frame 2 and is distributed at both left and right ends of the vacuum suction head 3, and the link 4 is lifted and lowered on the auxiliary guide rail 51 by driving of the lifting motor 52.
Further, referring to fig. 5 and 6, the connecting frame 4 is L-shaped, the vertical side plate is assembled on the lifting mechanism 5, and the horizontal bottom plate is provided with a U-shaped slot 41. The top of the vacuum suction head 3 is detachably connected with the U-shaped clamping groove 41 through a T-shaped screw 31; the vacuum suction head 3 and the horizontal bottom plate are limited by a locating pin 32. Wherein, the number of the connecting frames 4 is two, and the connecting frames are arranged opposite to the auxiliary guide rails 51 in the lifting mechanism 5. The connecting frame 4 is fixed on the vacuum suction head 3 through the T-shaped screw 31, namely, the rod part of the T-shaped screw 31 passes through the U-shaped clamping groove 41 and is in threaded connection with the top of the vacuum suction head 3. A lifting motor 52 in the lifting mechanism 5 drives the vertical side plate of the link 4 to lift on the auxiliary rail 51.
Referring to fig. 1, an air channel block 6 is further installed on the movable frame 2, a plurality of inlets are formed in the side wall of the air channel block 6, an outlet is formed in the top of the air channel block 6, and the outlet of the air channel block 6 is connected with a feed inlet of the vacuum generating mechanism through a pipeline. The middle upper part of the vacuum suction head 3 is provided with a plurality of pipeline joints 7 at intervals, and a feed inlet of each pipeline joint 7 is communicated with the inner cavity of the vacuum suction head 3; the discharge port of the pipeline joint 7 is communicated with the corresponding inlet of the air passage block 6 through a connecting pipe.
In order to obtain the redundant solder balls on the steel mesh 8, a discharge hole of the vacuum generating mechanism is provided with a solder ball recovery device for recovering the solder balls. Wherein the vacuum generating mechanism includes, but is not limited to, a blower; tin ball recovery devices include, but are not limited to, vacuum filtration cartridges. The redundant tin balls on the steel mesh 8 flow through the air path block 6 through the vacuum adsorption of the vacuum suction head 3 and finally flow to the vacuum generating mechanism. The solder balls are discharged to the solder ball recovery device through a discharge hole of the vacuum generating mechanism.
Before the multi-ball removing device works, the movable frame 2 is arranged at the rear end of the fixed frame 1, and the ball planting mechanism 9 is arranged at the front end of the fixed frame 1. Placing the wafer under the steel mesh 8; the ball planting mechanism 9 moves from front to back along the fixing frame 1, and simultaneously, tin balls are scattered on the steel mesh 8 and are adhered to corresponding adhesive points of the wafer through holes in the steel mesh 8; the ball planting mechanism 9 moves from back to front along the fixing frame 1 to reset. The vacuum suction head 3 is lowered to a proper height; the vacuum generating mechanism operates, the movable frame 2 drives the vacuum suction head 3 to move forwards from back to back at a constant speed, and meanwhile, the vacuum suction head 3 vacuum-adsorbs redundant tin balls which are not adhered to the wafer on the steel mesh 8; after the ball is removed, the movable frame 2 stops moving, the vacuum generating mechanism stops running, then the vacuum suction head 3 rises and resets, and the movable frame 2 moves from front to back and resets.
The ball implanting mode of the ball implanting mechanism 9 includes, but is not limited to, brush ball implanting, manual ball implanting, manipulator ball implanting, etc.
According to the utility model, the manual ball removing step is replaced by vacuum adsorption, so that the working efficiency is improved; the vacuum suction head 3 effectively adsorbs redundant tin balls on the steel mesh 8 in a vacuum manner and does not contact with normal tin balls, so that other good products are prevented from being damaged, the process quality is improved, and the overall ball planting yield is improved; the height of the adaptive ball is adjusted by lifting the vacuum suction head 3, and the vacuum adsorption force is adjusted by the vacuum generating mechanism, so that tin balls with different sizes are adapted.
Example 2
This embodiment is a modified embodiment of embodiment 1.
Referring to fig. 2, the ball-implanting mode of the ball-implanting mechanism 9 is brush ball-implanting. The ball planting mechanism 9 comprises a mounting frame 91, a supporting seat 92, a ball supply bin 93 and a brush 94. The mounting frame 91 is transversely arranged and is slidably assembled on the fixing frame 1 along the length direction of the fixing frame 1 through corresponding sliding rails, namely, the mounting frame 91 slides back and forth along the fixing frame 1. The support base 92 is slidably mounted on the mounting frame 91 along the length direction of the mounting frame 91, that is, the support base 92 slides left and right along the mounting frame 91. The ball supply bin 93 is fixed at the middle upper part of the supporting seat 92, the ball inlet is arranged at the top end of the ball supply bin 93, and the ball outlet is arranged at the bottom end of the ball supply bin 93. The brush 94 is assembled at the bottom of the ball supply bin 93, and is annularly arranged outside the ball outlet of the ball supply bin 93.
When the ball planting mechanism 9 works, the mounting frame 91 drives the hairbrush 94 and the ball supply bin 93 to move back and forth, and the supporting seat 92 drives the hairbrush 94 and the ball supply bin 93 to move left and right; during the process, the solder balls are discharged to the center of the brush 94 from the ball outlet by the ball supply bin 93, and the brush 94 sweeps the solder balls so that the solder balls are adhered to corresponding adhesive points of the wafer through the through holes in the steel mesh 8. After the ball implantation is finished, the vacuum suction head 3 carries out vacuum suction on the redundant solder balls on the steel mesh 8.
The utility model uses the brush 94 to implant balls, thereby effectively improving the working efficiency.
The foregoing describes one embodiment of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to be covered by the present utility model.
Claims (10)
1. Get rid of many ball devices, including mount (1), movable frame (2) and plant ball mechanism (9), movable frame (2) with plant ball mechanism (9) transversely set up and follow through the slide rail that corresponds respectively the length direction sliding assembly of mount (1) is in on mount (1), steel mesh (8) have been laid on mount (1), movable frame (2) with plant ball mechanism (9) all are located the top of steel mesh (8), its characterized in that:
The front side or the rear side of the movable frame (2) is provided with a vacuum suction head (3) in a lifting manner; the vacuum suction head (3) is of a strip-shaped structure and extends along the width direction of the steel mesh (8), the vacuum suction head (3) is positioned above the steel mesh (8), a feed inlet of the vacuum suction head is arranged downwards, and a discharge outlet of the vacuum suction head is arranged at the middle upper part of the vacuum suction head (3) and is connected with the feed inlet of the vacuum generating mechanism.
2. The device for removing multiple balls according to claim 1, characterized in that the distance between the bottom of the vacuum suction head (3) and the surface of the steel mesh (8) is 2-4 mm.
3. The multi-ball removal device according to claim 1, wherein the vacuum cleaner head (3) is lifted by a lifting mechanism (5); the lifting mechanism (5) is fixed on the movable frame (2) and distributed at the left end and the right end of the vacuum suction head (3), and the vacuum suction head (3) is connected with the lifting mechanism (5) through the connecting frame (4).
4. A multi-ball removing device according to claim 3, wherein the lifting mechanism (5) comprises an auxiliary guide rail (51) matched with the connecting frame (4) and a lifting motor (52), the auxiliary guide rail (51) is vertically fixed on the movable frame (2) and distributed at the left end and the right end of the vacuum suction head (3), and the connecting frame (4) is lifted on the auxiliary guide rail (51) through the driving of the lifting motor (52).
5. A device for removing multiple balls according to claim 3, wherein the connecting frame (4) is L-shaped, the vertical side plate of the connecting frame is assembled on the lifting mechanism (5), and the horizontal bottom plate of the connecting frame is provided with a U-shaped clamping groove (41); the top of the vacuum suction head (3) is detachably connected with the U-shaped clamping groove (41) through a T-shaped screw (31); the vacuum suction head (3) and the horizontal bottom plate are limited through a locating pin (32).
6. The multi-ball removing device according to claim 1, wherein the movable frame (2) is further provided with an air passage block (6), the side wall of the air passage block (6) is provided with a plurality of inlets, the top of the air passage block (6) is provided with an outlet, and the outlet of the air passage block (6) is connected with a feed inlet of a vacuum generating mechanism through a pipeline;
The middle upper part of the vacuum suction head (3) is provided with a plurality of pipeline joints (7) at intervals, and a feed inlet of each pipeline joint (7) is communicated with an inner cavity of the vacuum suction head (3); and a discharge hole of the pipeline joint (7) is communicated with an inlet corresponding to the air passage block (6) through a connecting pipe.
7. The multi-ball removing device according to claim 1, wherein the discharge port of the vacuum generating mechanism is provided with a solder ball recovery device for recovering solder balls.
8. The multi-ball removing device according to claim 1, wherein the ball planting mechanism (9) comprises a mounting frame (91), a supporting seat (92), a ball supply bin (93) and a brush (94);
the mounting frame (91) is transversely arranged and is assembled on the fixing frame (1) in a sliding manner along the length direction of the fixing frame (1) through corresponding sliding rails;
The supporting seat (92) is assembled on the mounting frame (91) in a sliding manner along the length direction of the mounting frame (91);
The ball feeding bin (93) is fixed at the middle upper part of the supporting seat (92), a ball inlet of the ball feeding bin is arranged at the top end of the ball feeding bin (93), and a ball outlet of the ball feeding bin is arranged at the bottom end of the ball feeding bin (93);
The hairbrush (94) is assembled at the bottom of the ball supply bin (93), and is annularly arranged outside the ball outlet of the ball supply bin (93).
9. The multi-ball removing device according to claim 1, wherein the traveling speed of the movable frame (2) sliding along the length direction of the fixed frame (1) is 40mm/s to 130mm/s.
10. The multi-ball removing device according to claim 1, wherein the traveling speed of the ball planting mechanism (9) sliding along the length direction of the fixing frame (1) is 10 mm/s-160 mm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322822742.XU CN220971035U (en) | 2023-10-20 | 2023-10-20 | Get rid of many balls and put |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322822742.XU CN220971035U (en) | 2023-10-20 | 2023-10-20 | Get rid of many balls and put |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220971035U true CN220971035U (en) | 2024-05-17 |
Family
ID=91060631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322822742.XU Active CN220971035U (en) | 2023-10-20 | 2023-10-20 | Get rid of many balls and put |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220971035U (en) |
-
2023
- 2023-10-20 CN CN202322822742.XU patent/CN220971035U/en active Active
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