CN214555438U - Circuit board overhauls production line - Google Patents
Circuit board overhauls production line Download PDFInfo
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- CN214555438U CN214555438U CN202120158124.8U CN202120158124U CN214555438U CN 214555438 U CN214555438 U CN 214555438U CN 202120158124 U CN202120158124 U CN 202120158124U CN 214555438 U CN214555438 U CN 214555438U
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Abstract
The utility model is suitable for a circuit board field of making provides a circuit board overhauls production line, include: the automatic optical inspection device is used for inspecting the circuit board to obtain inspection information and obtaining the class information of the circuit board according to the inspection information and a preset defect classification standard; the overhauling device comprises a qualified product transmission line, a first repairing transmission line and an automatic repairing machine, wherein the automatic repairing machine is arranged on one side of the first repairing transmission line and is used for repairing defects on the circuit board; the first automatic board separator is used for identifying the category information of the circuit board and transmitting the circuit board to the maintenance device according to the category information. Above-mentioned circuit board overhauls production line has promoted maintenance efficiency and has reduced the maintenance cost, has avoided the product to wipe the risk of spending simultaneously.
Description
Technical Field
The utility model relates to a circuit board field of making especially relates to a circuit board overhauls production line.
Background
In the manufacturing process of the circuit board, Automatic Optical Inspection (AOI) is required to be performed on the circuit board after the circuit flow is completed, and the detected defects are required to be confirmed and repaired after the Inspection is completed.
The traditional defect confirming and repairing modes are in a single machine mode, and each circuit board needs to be manually transported, manually loaded and unloaded, manually confirm the defects and manually repair the defects needing to be repaired; for circuit boards which cannot be repaired manually, the circuit boards also need to be manually transported to an automatic repairing machine for repairing. Therefore, the existing circuit board maintenance process needs multiple manual operations, is complex in process and low in efficiency, and has the risk of wiping the product.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a circuit board overhauls production line to the maintenance flow that solves circuit board among the prior art is loaded down with trivial details, inefficiency and has the problem that the product wiped the colored risk.
The utility model provides a circuit board overhauls production line, include:
the automatic optical inspection device is used for inspecting the circuit board to obtain inspection information and obtaining the class information of the circuit board according to the inspection information and a preset defect classification standard;
the overhauling device comprises a qualified product transmission line, a first repairing transmission line and an automatic repairing machine, wherein the automatic repairing machine is arranged on one side of the first repairing transmission line and is used for repairing defects on the circuit board;
the first automatic board separator is used for identifying the category information of the circuit board and transmitting the circuit board to the maintenance device according to the category information.
In an embodiment, the maintenance device further comprises a second repairing transmission line, and one side of the second repairing transmission line is provided with a manual repairing station.
In an embodiment, the circuit board overhaul production line further comprises a board collecting machine, and the qualified product transmission line, the first repairing transmission line and the second repairing transmission line are all connected with the board collecting machine.
In one embodiment, the category information of the line board includes:
the method comprises the following steps that a first defect repaired by a standby device exists on a first type of circuit board;
a second type, wherein a second defect to be repaired manually exists on the circuit board of the second type;
a third type, wherein no defect point is present on the circuit board of the third type;
the first repairing transmission line is used for transmitting a first type of circuit board, the second repairing transmission line is used for transmitting a second type of circuit board, and the qualified product transmission line is used for transmitting a third type of circuit board.
In one embodiment, the first defect is a protruding copper defect spot with a size less than 40 × 40um, or a notched defect spot with a size less than or equal to 50 × 50 um;
the second defects are protruding copper defect points having a size greater than or equal to 40 x 40 um.
In an embodiment, the category information of the circuit board further includes:
a fourth type, wherein the first defect and the second defect are present on the circuit board of the fourth type at the same time;
the second repairing transmission line is used for transmitting the second type and the fourth type of circuit boards, the circuit board overhauling production line further comprises a second automatic board separator, the second automatic board separator is arranged on one side, away from the first automatic board separator, of the manual repairing station, and the second automatic board separator is used for identifying the type information of the circuit boards passing through the manual repairing station and transmitting the fourth type of circuit boards to the first repairing transmission line.
In an embodiment, the circuit board overhaul production line further comprises a transfer line, and the transfer line is connected between the second automatic board separator and the first repair line;
along the transmission direction of the first repairing transmission line, the automatic repairing machine is arranged on one side, far away from the manual repairing station, of the transfer transmission line.
In an embodiment, the category information of the circuit board further includes:
fifthly, each circuit board on the production board has the defect that the circuit board cannot be repaired;
the circuit board overhauling production line further comprises a scrapped board temporary storage table, wherein the scrapped board temporary storage table is adjacent to the first automatic board separator and is used for bearing the circuit board of the fifth type.
In one embodiment, the manual repair station is configured with a defect confirmation machine for acquiring and displaying the detection information.
In one embodiment, an identification code is arranged on the circuit board, and the identification code is used for recording product identification information, the detection information and the category information of the circuit board;
the first automatic board separator comprises a code reader and a manipulator which are connected, the code reader is used for reading the identification code on the circuit board and acquiring the category information, and the manipulator is used for grabbing the circuit board according to the category information and placing the circuit board into the maintenance device.
Therefore, the circuit board overhauling production line can detect the defects of the circuit board through the automatic optical inspection device and classify the circuit board according to the detection information, and the first automatic board separating machine can convey the circuit board to the overhauling device according to the type of the circuit board, so that the defects on the circuit board can be repaired through the automatic repairing machine, and the defect-free circuit board can be directly conveyed through the qualified product transmission line. Above-mentioned circuit board overhauls production line will automatic optical inspection device, first automatic board separator, overhaul the device line, and degree of automation is higher, has promoted maintenance efficiency and has reduced the cost of overhaul.
Meanwhile, the circuit board overhauling production line classifies the circuit boards through the automatic optical inspection device and realizes classified transmission through the first automatic board separator, the defects of products do not need to be confirmed manually, classified products do not need to be selected manually, the flow is simple, and the risk of wiping the patterns of the products is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
FIG. 1 is a schematic structural view of a circuit board maintenance production line provided by an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of the automatic optical inspection apparatus in the board inspection line shown in FIG. 1;
fig. 3 is a schematic structural diagram of a first automatic board separator in the circuit board inspection line shown in fig. 1.
The designations in the figures mean:
100. a circuit board overhaul production line;
10. an automatic optical inspection device; 11. an AOI detection unit; 12. a processing unit;
20. a first automatic board separator; 21. a code reader; 22. a manipulator;
30. overhauling the device; 31. qualified product conveying lines; 32. a first repair transmission line; 33. an automatic repairing machine; 34. a second repair transmission line; 35. a manual repair station; 36. a transfer line; 37. a scrap plate temporary storage table;
40. a board collecting machine;
50. and the second automatic board separator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention will be further described in detail with reference to the accompanying drawings, which are examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, are not to be construed as limiting the patent. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
To explain the technical solution of the present invention, the following description is made with reference to the specific drawings and examples.
The utility model provides a circuit board overhauls production line 100 for detect and repair the circuit board automatically. The circuit board may be a substrate-like PCB (SLP), but is not limited thereto, and the circuit board may also be another type of circuit board.
Referring to fig. 1, a circuit board inspection line 100 includes an automatic optical inspection apparatus 10, a first automatic board separator 20, and an inspection apparatus 30.
The automatic optical inspection device 10 is used for inspecting the circuit board to obtain inspection information, and obtaining the classification information of the circuit board according to the inspection information and the preset defect classification standard.
The detection information of the circuit board can include the number and the positions of the defect points on the circuit board, and the category information of the circuit board is used for indicating the category to which the circuit board belongs after detection, for example, the circuit board is a qualified product or the circuit board is an unqualified product to be repaired; or the circuit board needs manual maintenance, machine maintenance, maintenance-free and the like, and the category information of the circuit board and the preset defect classification standard can be set according to the requirements.
The first automatic board separator 20 is used for identifying the type information of the circuit board and transmitting the circuit board to the maintenance device according to the type information.
The repairing device 30 comprises a qualified product transmission line 31, a first repairing transmission line 32 and an automatic repairing machine 33, wherein the automatic repairing machine 33 is arranged on one side of the first repairing transmission line 32 and is used for repairing defects on the circuit board. It is understood that when the types of the circuit boards are more than two, the service device 30 may include more than two transmission lines.
In production, first, the automatic optical inspection apparatus 10 may detect defects on the circuit board to obtain detection information, and obtain category information of the circuit board according to the detection information and preset defect classification criteria, that is, perform detection and pre-screening classification on the circuit board. Therefore, the defects of the circuit board do not need to be confirmed and classified manually according to the detection information, and the detection and screening efficiency is improved.
Next, the first automatic board separator 20 identifies the type information of the circuit board, and transfers the circuit board to the inspection device 30 according to the type information, for example, transfers the circuit board to the first repair transmission line 32 or the non-defective transmission line 31 in the inspection device 30.
Then, the first repairing transmission line 32 transmits the circuit board to the automatic repairing machine 33, the automatic repairing machine 33 automatically repairs the defects on the circuit board, and the first repairing transmission line 32 transmits the repaired circuit board to a board collecting station; the qualified product transmission line 31 transmits the circuit board to a board receiving station for receiving. It is understood that the robot for transferring the circuit board may be provided at the automatic repairing machine 33.
Therefore, the above-mentioned board inspection line 100 can detect the defects of the boards by the automatic optical inspection apparatus 10 and classify the boards according to the detection information, and the first automatic board separator 20 can transfer the boards to the inspection apparatus 30 according to the classification of the boards, thereby repairing the defects on the boards by the automatic repairing machine 33 and directly transporting the non-defective boards by the non-defective product transporting line 31. Above-mentioned circuit board overhauls production line 100 with automatic optical inspection device 10, first automatic board separator 20, overhaul device 30 line, degree of automation is higher, has promoted maintenance efficiency and has reduced the cost of overhaul.
Meanwhile, the circuit board overhauling production line 100 classifies the circuit boards through the automatic optical inspection device 10 and realizes classified transmission through the first automatic board separator 20, so that the defects of the products do not need to be confirmed manually, the classified products do not need to be selected manually, the flow is simple, and the risk of scratching the products is avoided.
Optionally, the number of the automatic optical inspection device 10 and the number of the first automatic board separator may be multiple, so as to form multiple automatic lines.
Optionally, referring to fig. 2, the automatic optical inspection apparatus 10 includes an AOI detection unit 11 and a processing unit 12, which are communicatively connected, where the AOI detection unit 11 is configured to detect defects on the circuit board, and the processing unit 12 is configured to process detection signals of the AOI detection machine and obtain detection information; further, the processing unit 12 is further configured to obtain category information of the circuit board according to the detection information and a preset defect classification standard.
In one embodiment, the AOI detection unit 11 scans the circuit board to obtain a scanned image, and compares the scanned image with a standard image to detect a defect point on the circuit board and obtain detection information; the processing unit 12 rechecks the defective point according to the scanned image to determine whether the defective point is a false point; and the processing unit 12 matches the size of the defect point with a preset defect classification standard to determine the category of the circuit board. It will be appreciated that the processing unit 12 may identify and classify defects by building a model or other method, but is not limited thereto.
In one embodiment, the service device 30 further comprises a second repair line 34, and a manual repair station 35 is disposed at one side of the second repair line 34. The manual repair station 35 can arrange manual repair of the circuit board defects. The number of the manual repair stations 35 may be plural, and the plural manual repair stations 35 are sequentially arranged along the transmission direction of the first repair transmission line 32.
In one embodiment, the manual repair station 35 is configured with a defect verification machine (not shown) for acquiring and displaying inspection information. The defect confirming machine comprises a code reader and a display unit, wherein the code reader is used for identifying an identification code on the circuit board so as to acquire detection information of the circuit board; the display unit is used for displaying the detection information, so that the position of the defect can be conveniently and manually checked.
In an embodiment, the board inspection line 100 further includes a board collecting machine 40, and the non-defective transmission line 31, the first repairing transmission line 32 and the second repairing transmission line 34 are connected to the board collecting machine 40. The board collecting machine 40 is used for collecting the repaired circuit board and qualified products.
In one embodiment, the circuit board is provided with an identification code, and the identification code is used for recording a product identification code, detection information and category information of the circuit board. The identification code can be a two-dimensional code, namely the identification code is a two-dimensional code pattern formed by etching copper and a base material. It is understood that the identification code may be a bar code or other identification code.
Referring to fig. 3, in an embodiment, the first board automatic splitter 20 includes a code reader 21 and a manipulator 22 connected to the code reader 21, where the code reader 21 is configured to read identification information on a circuit board and obtain category information, and the manipulator 22 is configured to grasp the circuit board according to the category information and place the circuit board into the inspection device 30, for example, into the qualified product transmission line 31, the first repair transmission line 32, or the second repair transmission line 34.
In one embodiment, the category information of the circuit board includes:
the first type, a first defect exists on the first type of circuit board, and the first defect is a defect repaired by a standby device;
a second defect exists on the circuit board of the second type, and the second defect is a defect to be repaired manually;
and in the third category, no defect point exists on the circuit board in the third category.
When the automatic optical inspection device 10 classifies the circuit boards, it may determine whether the defect points detected by the AOI detection unit 11 are false points, and if the defect points are false points, the processing unit 12 classifies the circuit boards into a third class. In addition, for the wiring boards for which the defective points are not detected by the AOI detection unit 11, the same is classified into the third category.
The first repairing transmission line 32 is used for transmitting a first type of circuit board, the second repairing transmission line 34 is used for transmitting a second type of circuit board, and the qualified product transmission line 31 is used for transmitting a third type of circuit board.
In one embodiment, the first defect is a copper bump defect point with a size less than 40 × 40um, or a copper defect point with a size less than or equal to 50 × 50um, and at this time, the defect point with a smaller size or the defect point with copper is repaired accurately by an automatic repairing machine; the second defect is a convex copper defect point with the size larger than or equal to 40 × 40um, and the size of the convex copper defect point is larger, so that manual repair is facilitated.
When the circuit board has the copper bump, the copper bump may have a short circuit. Specifically, when the bump copper size is greater than or equal to the line gap, a short circuit exists at the bump copper defect point; when the size of the convex copper is smaller than the line clearance, the risk of short circuit may exist in the subsequent production or assembly; when the circuit board has a notch defect point, an open circuit may exist at the notch defect point, specifically, when the size of the notch is greater than or equal to the size of the circuit, the circuit has an open circuit; when the gap size is smaller than the line size, the lines are still connected, but there is a risk of an open circuit. Therefore, the above defects need to be repaired.
It is to be understood that the criteria for the first defect and the second defect may be set according to requirements, not limited thereto.
In one embodiment, the classes of wiring boards further include: and in the fourth type, the first defect and the second defect exist on the circuit board at the same time.
The second repairing transmission line is used for transmitting second and fourth types of circuit boards, the circuit board repairing production line 100 further includes a second automatic board separator 50, the second automatic board separator 50 is disposed on one side of the manual repairing station 35 far away from the first automatic board separator 20, and the second automatic board separator 50 is used for identifying the type information of the circuit boards passing through the manual repairing station 35 and transmitting the fourth type of circuit boards to the first repairing transmission line 32.
Optionally, the second automatic board separator 50 has the same structure as the first automatic board separator 20, and includes a code reader and a manipulator connected to the code reader, wherein the code reader is used for reading the identification information on the circuit board and obtaining the category information, and the manipulator is used for grabbing the circuit board according to the category information and placing the circuit board into the first repairing transmission line 32 or the second repairing transmission line 34.
Optionally, the board inspection line 100 further includes a transfer line 36, wherein the transfer line 36 is connected between the second automatic board separator 50 and the first repairing line 32; the automatic repair machine 33 is disposed on a side of the transfer line 36 away from the manual repair station 35 along the transfer direction of the first repair line 32. At this time, the robot in the second automatic board separator 50 is used to put the circuit board into the first repairing transmission line 32 or the transit transmission line 36 according to the type information of the circuit board, and then the circuit board is transferred to the first repairing transmission line 32 by the transit transmission line 36.
Alternatively, when the second repairing transmission line 34 is closer to the first repairing transmission line 32, the second board separator 50 can directly transfer the circuit board.
In one embodiment, the classes of wiring boards further include: fifthly, each circuit board on the production board has the defect that the circuit board cannot be repaired; the circuit board overhauling production line 100 further comprises a temporary scrapped board storage table 37, wherein the temporary scrapped board storage table 37 is arranged adjacent to the first automatic board separator 20 and is used for bearing a fifth type of circuit board. The fifth specific standard may be a scrap standard or an internal control standard in the industry, and may be set according to requirements.
It should be noted that the circuit board overhaul production line 100 is used for overhauling circuit boards, two or more circuit boards are located in one production board, and when each circuit board on the production board has a defect which cannot be repaired, the production board is directly scrapped; when a plurality of circuit boards on the production board have the defect that the circuit boards can not be repaired, and simultaneously when the circuit boards need to be repaired, the whole production board does not need to be scrapped, and the circuit boards needing to be repaired can be classified respectively.
In addition, for the production board, if each circuit board in the production board is of the first type, the first automatic board separator 20 grabs the production board to the first repairing transmission line 32; if all the circuit boards in the production board are of the second type, the first automatic board separator 20 grabs the production board to the second repairing transmission line 34; if the circuit boards in the production board are of the first type and the circuit boards in the second type, or the circuit boards in the production board are of the fourth type, the first automatic board separator 20 grabs the production board to the second repair transmission line 34.
In another embodiment, the circuit board inspection line 100 may be additionally provided with a scrapped board transmission line for transmitting scrapped boards to a designated scrapped area.
The operation process of the circuit board overhauling production line 100 of the embodiment of the application is as follows:
first, the automatic optical inspection apparatus 10 may detect defects on the circuit board to obtain inspection information, and obtain category information of the circuit board according to the inspection information and a preset defect classification standard, where the category information includes a first category, a second category, a third category, a fourth category, and a fifth category.
Then, the first automatic board separator 20 identifies the type information of the circuit boards, and transfers the circuit boards to the maintenance device 30 according to the type information, for example, the first type of circuit boards are picked up to the first repairing transmission line 32, the second type and the fourth type of circuit boards are picked up to the second repairing transmission line 34, the third type of circuit boards are picked up to the qualified product transmission line 31, and the fifth type of circuit boards are picked up to the scrapped board temporary storage table 37.
Then, the automatic repairing machine 33 automatically repairs the circuit board on the first repairing transmission line 32, and the manual repairing station 35 manually repairs the circuit board on the second repairing transmission line 34.
When the circuit board is transmitted to the second automatic board separator 50, the second automatic board separator 50 identifies the category information of the circuit board, captures the fourth type of circuit board to the first repairing transmission line 32 for continuous transmission, and then the automatic repairing machine 33 repairs the first defect on the circuit board; the second type of circuit board continues along the second patch transmission line 34.
The first repairing transmission line 32, the second repairing transmission line 34 and the qualified product transmission line 31 all transmit the circuit board to the board collecting machine 40, and thus the automatic repairing process of the circuit board is completed.
The operation flow of the circuit board overhauling production line 100 comprises automatic optical inspection, defect classification, shunt transportation, repairing and board collection, so that automatic detection and circuit board repairing are realized, manual operation is reduced, and production efficiency is improved.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A circuit board overhauls production line which characterized in that includes:
the automatic optical inspection device is used for inspecting the circuit board to obtain inspection information and obtaining the class information of the circuit board according to the inspection information and a preset defect classification standard;
the overhauling device comprises a qualified product transmission line, a first repairing transmission line and an automatic repairing machine, wherein the automatic repairing machine is arranged on one side of the first repairing transmission line and is used for repairing defects on the circuit board;
the first automatic board separator is used for identifying the category information of the circuit board and transmitting the circuit board to the maintenance device according to the category information.
2. The circuit board inspection production line of claim 1, wherein the inspection device further comprises a second repair transmission line, and a manual repair station is provided on one side of the second repair transmission line.
3. The board inspection line of claim 2, further comprising a board collector, the non-defective transmission line, the first repair transmission line, and the second repair transmission line being connected to the board collector.
4. The board servicing production line of claim 2, wherein the category information of the boards comprises:
the method comprises the following steps that a first defect repaired by a standby device exists on a first type of circuit board;
a second type, wherein a second defect to be repaired manually exists on the circuit board of the second type;
a third type, wherein no defect point is present on the circuit board of the third type;
the first repairing transmission line is used for transmitting a first type of circuit board, the second repairing transmission line is used for transmitting a second type of circuit board, and the qualified product transmission line is used for transmitting a third type of circuit board.
5. A board servicing line according to claim 4,
the first defects are protruding copper defect points with the size less than 40 × 40um or notch defect points with the size less than or equal to 50 × 50 um;
the second defects are protruding copper defect points having a size greater than or equal to 40 x 40 um.
6. The board servicing production line of claim 4, wherein the category information of the boards further comprises:
a fourth type, wherein the first defect and the second defect are present on the circuit board of the fourth type at the same time;
the second repairing transmission line is used for transmitting the second type and the fourth type of circuit boards, the circuit board overhauling production line further comprises a second automatic board separator, the second automatic board separator is arranged on one side, away from the first automatic board separator, of the manual repairing station, and the second automatic board separator is used for identifying the type information of the circuit boards passing through the manual repairing station and transmitting the fourth type of circuit boards to the first repairing transmission line.
7. The board servicing line of claim 6, further comprising a transfer line, the transfer line being connected between the second automated board separator and the first repair line;
along the transmission direction of the first repairing transmission line, the automatic repairing machine is arranged on one side, far away from the manual repairing station, of the transfer transmission line.
8. The board servicing production line of claim 4, wherein the category information of the boards further comprises:
fifthly, each circuit board on the production board has the defect that the circuit board cannot be repaired;
the circuit board overhauling production line further comprises a scrapped board temporary storage table, wherein the scrapped board temporary storage table is adjacent to the first automatic board separator and is used for bearing the circuit board of the fifth type.
9. The board inspection line of claim 2, wherein the manual repair station is configured with a defect verification machine for obtaining and displaying the inspection information.
10. The circuit board inspection production line of claim 1, wherein an identification code is provided on the circuit board, the identification code being used to record product identification information, the detection information and the category information of the circuit board;
the first automatic board separator comprises a code reader and a manipulator which are connected, the code reader is used for reading the identification code on the circuit board and acquiring the category information, and the manipulator is used for grabbing the circuit board according to the category information and placing the circuit board into the maintenance device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120158124.8U CN214555438U (en) | 2021-01-20 | 2021-01-20 | Circuit board overhauls production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120158124.8U CN214555438U (en) | 2021-01-20 | 2021-01-20 | Circuit board overhauls production line |
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| Publication Number | Publication Date |
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| CN214555438U true CN214555438U (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120158124.8U Active CN214555438U (en) | 2021-01-20 | 2021-01-20 | Circuit board overhauls production line |
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- 2021-01-20 CN CN202120158124.8U patent/CN214555438U/en active Active
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