CN114833652A - Processing device for developing needle tube - Google Patents
Processing device for developing needle tube Download PDFInfo
- Publication number
- CN114833652A CN114833652A CN202210380403.8A CN202210380403A CN114833652A CN 114833652 A CN114833652 A CN 114833652A CN 202210380403 A CN202210380403 A CN 202210380403A CN 114833652 A CN114833652 A CN 114833652A
- Authority
- CN
- China
- Prior art keywords
- clamping
- needle tube
- seat
- central column
- base
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000017525 heat dissipation Effects 0.000 claims abstract description 24
- 238000005498 polishing Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
- B24B5/16—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding peculiarly surfaces, e.g. bulged
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/02—Frames; Beds; Carriages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/02—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables
- B24B47/06—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables by liquid or gas pressure only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
Abstract
The invention discloses a processing device of a developing needle tube, and belongs to the technical field of processing of developing needle tubes. The device comprises a base, a central column is fixedly arranged at the upper end of the base, the device further comprises a plurality of clamping seats, the clamping seats are uniformly arranged on the periphery side of the central column, the clamping seats are rotatably arranged at the upper end of the base, a clamping assembly used for clamping a developing needle tube is arranged at the upper end of the clamping seats, a supporting plate fixed at the upper end of the base is arranged on one side, away from the central column, of each clamping seat, a plurality of positioning plates are uniformly arranged on one side, close to the central column, of the supporting plate, a plurality of moving seats are arranged on the outer side wall of the central column in a telescopic mode, a mounting groove is formed in one side of each moving seat, a rotating shaft is arranged in the mounting groove in a rotating mode, the rotating direction of the rotating shaft is opposite to that of the clamping seats, a plurality of polishing wheels are arranged in the rotating shaft, and a heat dissipation assembly is arranged in each moving seat.
Description
Technical Field
The invention relates to the technical field of processing of developing needle tubes, in particular to a processing device of a developing needle tube.
Background
At present, after a puncture needle enters a human body, the puncture needle is mainly positioned and developed by means of instruments and equipment such as ultrasonic waves and the like; however, the surface of the conventional puncture needle is mostly a smooth cambered surface, so that signals such as ultrasound and the like can be reflected back again, the reflecting surface received by the instrument is small, the feedback signal is weak, the developing effect is poor, and the operation effect is influenced.
Therefore, the development puncture needle with the groove on the surface of the needle tube appears, but the equipment structure used by the existing puncture needle for processing the groove is complex and cannot be processed in large batch.
Disclosure of Invention
The present invention is directed to a processing apparatus for a developing needle tube, which solves the above problems.
In order to achieve the purpose, the invention provides the following technical scheme:
a processing device of a developing needle tube comprises a base, wherein a central column is fixedly arranged at the upper end of the base, and the processing device also comprises a plurality of clamping seats, the clamping seats are uniformly arranged at the periphery of the central column, the clamping seats are rotatably arranged at the upper end of the base, a clamping component for clamping the developing needle tube is arranged at the upper end of the clamping seats, a first motor for driving the clamping seats to rotate is arranged in the base, a supporting plate fixed at the upper end of the base is arranged at one side of the clamping seats away from the central column, a plurality of positioning plates are uniformly arranged at one side of the supporting plate close to the central column, the developing needle tube penetrates through the positioning plates and is rotatably arranged with the positioning plates, a plurality of movable seats corresponding to the clamping seats are telescopically arranged on the outer side wall of the central column, a mounting groove is formed at one side of the movable seats away from the central column, a rotating shaft is rotatably arranged in the mounting groove, and a second motor for driving the rotating shaft to rotate is arranged on the movable seats, the rotating direction of the rotating shaft is opposite to the rotating direction of the clamping seat, a plurality of polishing wheels used for polishing the developing needle tubes are uniformly and fixedly arranged on the rotating shaft, and a heat dissipation assembly used for dissipating heat for the polishing wheels is arranged in the moving seat.
As a further scheme of the invention: the clamping assembly comprises a clamping cylinder and a clamping block, a clamping groove used for placing the lower end of the developing needle tube is formed in the upper end of the clamping seat, a plurality of clamping cylinders which are arranged in an annular mode are fixedly arranged on the side wall of the clamping seat, the output end of each clamping cylinder penetrates through the side wall of the clamping seat and can move in the clamping groove, and the clamping block is fixedly arranged at the output end of each clamping cylinder.
As a still further scheme of the invention: the heat dissipation assembly comprises a water channel and a plurality of water diversion channels which are arranged in the movable seat, the water channel is connected with an external water pipe, a plurality of heat dissipation grooves which are communicated with the mounting groove and correspond to the polishing wheel are formed in the movable seat, one end of the polishing wheel passes through the heat dissipation grooves and can rotate in the heat dissipation grooves, and the water channel is communicated with the upper ends of the heat dissipation grooves through the water diversion channels.
As a still further scheme of the invention: the side wall of the central column is fixedly provided with a plurality of groups of pushing cylinders which are arranged in an annular mode, and the output ends of the pushing cylinders are connected with the moving seat.
Compared with the prior art, the invention has the beneficial effects that:
1. the developing needle tube penetrates through the positioning plate and is inserted into the clamping groove of the clamping seat, the developing needle tube can be clamped and fixed through the clamping cylinder in the clamping seat, the developing needle tube is driven to rotate through the rotation of the clamping seat, the stability of the developing needle tube during polishing is ensured by the positioning plate, and the problem that the developing needle tube is bent due to uneven stress during polishing is avoided;
2. through the cooperation of the pushing cylinder, the moving seat, the second motor, the rotating shaft and the plurality of grinding wheels, when the developing needle tube needs to be ground, the pushing cylinder pushes the moving seat to be close to the developing needle tube, the second motor drives the rotating shaft to rotate, the grinding wheels are contacted with the developing needle tube, then grooves at the grinding positions on the developing needle tube can be ground, the plurality of grinding wheels rotate together, the plurality of grooves are simultaneously machined, the machining efficiency is high, meanwhile, through controlling the pushing cylinder, the displacement of the grinding wheels can be controlled, the grinding depth of the grooves of the developing needle tube is further controlled, and the flexibility is high;
3. the heat dissipation of the polishing wheel is realized by arranging the heat dissipation groove, the water channel and the water diversion channel, supplying water into the water channel through an external water pipe, spraying water into the heat dissipation groove through the water diversion channel, and dropping the water onto the polishing wheel in the heat dissipation groove;
4. the grinding efficiency is improved by enabling the rotation direction of the developing needle tube to be opposite to the rotation direction of the grinding wheel;
5. through setting up multiunit grip slipper and the removal seat that corresponds, can realize a plurality of development needle tubes simultaneous processing, machining efficiency is high.
In conclusion, the invention has simple structure, can realize the simultaneous processing of a plurality of developing needle tubes and has high processing efficiency.
Drawings
FIG. 1 is a structural view of a processing apparatus for a developing needle tube;
FIG. 2 is a top view of a developer needle cartridge processing apparatus;
fig. 3 is an enlarged view of the holder shown in fig. 1.
In the figure: 1. a base; 2. a first motor; 3. a clamping seat; 4. a developing needle tube; 5. a groove; 6. positioning a plate; 7. a support plate; 8. a rotating shaft; 9. a second motor; 10. mounting grooves; 11. a movable seat; 12. grinding the wheel; 13. a heat sink; 14. a water channel; 15. a water diversion channel; 16. a push cylinder; 17. a clamping cylinder; 18. a clamping block; 19. a clamping groove; 20. a central column.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-3, the embodiment provides a processing apparatus for a developing needle tube, which includes a base 1, a central column 20 fixedly disposed at an upper end of the base 1, and a plurality of holders 3, wherein the holders 3 are uniformly arranged around the central column 20, and in combination with fig. 2, 6 holders 3 are disposed in the present embodiment, the holders 3 are rotatably disposed at an upper end of the base 1, a clamping assembly for clamping the developing needle tube 4 is disposed at an upper end of the holders 3, a first motor 2 for driving the holders 3 to rotate is disposed in the base 1, a supporting plate 7 fixed at an upper end of the base 1 is disposed at a side of the holders 3 away from the central column 20, a plurality of positioning plates 6 are uniformly disposed at a side of the supporting plate 7 close to the central column 20, the developing needle tube 4 penetrates through the positioning plates 6 and is rotatably disposed with the positioning plates 6, specifically, positioning holes for the developing needle tube 4 to pass through are disposed on the positioning plates 6, the developing needle tube 4 can rotate in the positioning hole, the outer side wall of the central column 20 is telescopically provided with a plurality of moving seats 11 corresponding to the clamping seats 3, one side of the moving seat 11, which is far away from the central column 20, is provided with a mounting groove 10, a rotating shaft 8 is rotatably arranged in the mounting groove 10, the moving seat 11 is provided with a second motor 9 for driving the rotating shaft 8 to rotate, the rotating direction of the rotating shaft 8 is opposite to that of the clamping seats 3, the rotating shaft 8 is uniformly and fixedly provided with a plurality of grinding wheels 12 for grinding the developing needle tube 4, the moving seat 11 is internally provided with a heat dissipation assembly for dissipating heat of the grinding wheels 12, the number of the positioning plates 6 on the supporting plate 7 and the number of the grinding wheels 12 on the rotating shaft 8 can be determined according to the number of the grooves 5 to be formed on the developing needle tube 4, in the embodiment, four grooves 5 need to be formed on the developing needle tube 4, three positioning plates 6 are correspondingly arranged, two grooves 5 are processed between two adjacent positioning plates 6, and four grinding wheels 12 are correspondingly arranged on the rotating shaft 8.
Further, the centre gripping subassembly includes die clamping cylinder 17 and clamp splice 18, the double-layered groove 19 that is used for placing the lower extreme of developing needle tubing 4 is seted up to grip slipper 3 upper end, and the fixed die clamping cylinder 17 that is provided with a plurality of annular arrangements on the grip slipper 3 lateral wall, die clamping cylinder 17's output runs through grip slipper 3 lateral wall and can move about in clamp groove 19, clamp splice 18 is fixed to be set up at die clamping cylinder 17's output.
Still further, the heat dissipation assembly comprises a water channel 14 and a plurality of water diversion channels 15 which are arranged in the movable seat 11, the water channel 14 is connected with an external water pipe, a plurality of heat dissipation grooves 13 which are communicated with the mounting groove 10 and correspond to the grinding wheels 12 are formed in the movable seat 11, one end of each grinding wheel 12 passes through the heat dissipation groove 13 and can rotate in the heat dissipation groove 13, and the water channel 14 is communicated with the upper ends of the heat dissipation grooves 13 through the water diversion channels 15.
Still further, with reference to fig. 1 and 2, a plurality of groups of pushing cylinders 16 arranged in an annular manner are fixedly disposed on the side wall of the central column 20, the output end of each pushing cylinder 16 is connected to the moving base 11, and in this embodiment, one group of three pushing cylinders 16 is used to push one moving base 11 to move, so as to ensure the stability of the moving base 11.
When the developing device is used, the developing needle tube 4 penetrates through the positioning plate 6 and is inserted into the clamping seat 3, the lower end of the developing needle tube 4 is clamped through the clamping cylinder 17, the clamping seat 3 drives the developing needle tube 4 to rotate under the action of the first motor 2, the second motor 9 drives the rotating shaft 8 and the grinding wheel 12 to rotate, the pushing cylinder 16 pushes the moving seat 11 to move, the grinding wheel 12 is made to be close to the developing needle tube 4 and to be ground, the water pipe supplies water into the water channel 14, the water in the water channel 14 enters the heat dissipation groove 13 through the water diversion channel 15 and falls onto the grinding wheel 12, heat dissipation of the grinding wheel 12 is achieved, the pushing cylinder 16 resets after grinding, and the developing needle tube 4 is drawn out.
It should be noted that the above embodiments are only specific and clear descriptions of technical solutions and technical features of the present application. However, to those skilled in the art, aspects or features that are part of the prior art or common general knowledge are not described in detail in the above embodiments.
In addition, the technical solutions of the present application are not limited to the above-described embodiments, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined, so that other embodiments that can be understood by those skilled in the art may be formed.
Claims (4)
1. A processing device of a developing needle tube comprises a base (1), wherein a central column (20) is fixedly arranged at the upper end of the base (1), and the processing device is characterized by further comprising a plurality of clamping seats (3), the clamping seats (3) are uniformly arranged on the periphery of the central column (20), the clamping seats (3) are rotatably arranged at the upper end of the base (1), a clamping component for clamping the developing needle tube (4) is arranged at the upper end of the clamping seats (3), a first motor (2) for driving the clamping seats (3) to rotate is arranged in the base (1), a supporting plate (7) fixed at the upper end of the base (1) is arranged on one side, away from the central column (20), of the supporting plate (7), close to the central column (20), is uniformly provided with a plurality of positioning plates (6), and the developing needle tube (4) penetrates through the positioning plates (6) and is rotatably arranged with the positioning plates (6), the utility model discloses a developing needle tube (4) that is used for polishing, including center post (20), center post (20) lateral wall, telescopic removal seat (11) that are provided with a plurality of and grip slipper (3) correspond on the center post (20) lateral wall, remove one side that center post (20) were kept away from in seat (11) and seted up mounting groove (10), mounting groove (10) internal rotation is provided with pivot (8), removes and is provided with on seat (11) and is used for driving pivot (8) pivoted second motor (9), and pivot (8) rotation direction is opposite with grip slipper (3) rotation direction, evenly fixed being provided with a plurality of polishing wheels (12) that are used for polishing developing needle tube (4) on pivot (8), it is used for polishing the radiating radiator unit of wheel (12) to be provided with in removal seat (11).
2. The processing device of the developing needle tube as claimed in claim 1, wherein the clamping assembly comprises a clamping cylinder (17) and a clamping block (18), a clamping groove (19) for placing the lower end of the developing needle tube (4) is formed in the upper end of the clamping seat (3), a plurality of clamping cylinders (17) which are annularly arranged are fixedly arranged on the side wall of the clamping seat (3), the output end of each clamping cylinder (17) penetrates through the side wall of the clamping seat (3) and can move in the clamping groove (19), and the clamping block (18) is fixedly arranged at the output end of each clamping cylinder (17).
3. The processing device of a developing needle tube according to claim 2, wherein the heat dissipation assembly comprises a water channel (14) and a plurality of water diversion channels (15) which are arranged in the movable seat (11), the water channel (14) is connected with an external water pipe, a plurality of heat dissipation grooves (13) which are communicated with the mounting groove (10) and correspond to the polishing wheels (12) are arranged in the movable seat (11), one end of each polishing wheel (12) passes through the heat dissipation groove (13) and can rotate in the heat dissipation groove (13), and the water channel (14) is communicated with the upper ends of the plurality of heat dissipation grooves (13) through the water diversion channels (15).
4. The processing device of the developing needle tube as claimed in claim 1, wherein a plurality of groups of pushing cylinders (16) arranged in a ring shape are fixedly arranged on the side wall of the central column (20), and the output ends of the pushing cylinders (16) are connected with the movable base (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210380403.8A CN114833652B (en) | 2022-04-12 | 2022-04-12 | Processing device of developing needle tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210380403.8A CN114833652B (en) | 2022-04-12 | 2022-04-12 | Processing device of developing needle tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114833652A true CN114833652A (en) | 2022-08-02 |
| CN114833652B CN114833652B (en) | 2023-12-26 |
Family
ID=82564443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210380403.8A Active CN114833652B (en) | 2022-04-12 | 2022-04-12 | Processing device of developing needle tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114833652B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB715292A (en) * | 1952-04-16 | 1954-09-08 | Engis Ltd | Improvements in or relating to rotary abrasive heads |
| JP2005066811A (en) * | 2003-08-28 | 2005-03-17 | Nitto Kogyo Co Ltd | Outer diameter polishing method of developing roller |
| WO2011033478A1 (en) * | 2009-09-18 | 2011-03-24 | Poly Medicure Limited | Method and apparatus for making a hole, slot and/or depression in a needle proximal to its tip |
| KR20170138277A (en) * | 2016-06-07 | 2017-12-15 | (주)넥셈 | Compound Roller Automatic Apparatus |
| CN110281113A (en) * | 2019-07-03 | 2019-09-27 | 温州市贝特利电池科技有限公司 | A kind of automatic needle grinding machine |
| CN110774066A (en) * | 2019-11-05 | 2020-02-11 | 丽水市翔隆自动化设备制造有限公司 | Metal dysmorphism piece location presss from both sides tight equipment of polishing |
| CN210307306U (en) * | 2019-06-06 | 2020-04-14 | 常州德天医疗器械有限公司 | Needle grinding tool clamp |
| CN210414033U (en) * | 2019-05-24 | 2020-04-28 | 昆山艾斯博精密金属科技有限公司 | Burnishing device is used in production of metal needle tubing |
| WO2021184583A1 (en) * | 2020-03-16 | 2021-09-23 | 严东芳 | Cutting and polishing integrated apparatus for crystal processing |
| CN214559549U (en) * | 2020-12-24 | 2021-11-02 | 长沙永昌车辆零部件有限公司 | Rubber tube outer surface polishing device |
-
2022
- 2022-04-12 CN CN202210380403.8A patent/CN114833652B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB715292A (en) * | 1952-04-16 | 1954-09-08 | Engis Ltd | Improvements in or relating to rotary abrasive heads |
| JP2005066811A (en) * | 2003-08-28 | 2005-03-17 | Nitto Kogyo Co Ltd | Outer diameter polishing method of developing roller |
| WO2011033478A1 (en) * | 2009-09-18 | 2011-03-24 | Poly Medicure Limited | Method and apparatus for making a hole, slot and/or depression in a needle proximal to its tip |
| KR20170138277A (en) * | 2016-06-07 | 2017-12-15 | (주)넥셈 | Compound Roller Automatic Apparatus |
| CN210414033U (en) * | 2019-05-24 | 2020-04-28 | 昆山艾斯博精密金属科技有限公司 | Burnishing device is used in production of metal needle tubing |
| CN210307306U (en) * | 2019-06-06 | 2020-04-14 | 常州德天医疗器械有限公司 | Needle grinding tool clamp |
| CN110281113A (en) * | 2019-07-03 | 2019-09-27 | 温州市贝特利电池科技有限公司 | A kind of automatic needle grinding machine |
| CN110774066A (en) * | 2019-11-05 | 2020-02-11 | 丽水市翔隆自动化设备制造有限公司 | Metal dysmorphism piece location presss from both sides tight equipment of polishing |
| WO2021184583A1 (en) * | 2020-03-16 | 2021-09-23 | 严东芳 | Cutting and polishing integrated apparatus for crystal processing |
| CN214559549U (en) * | 2020-12-24 | 2021-11-02 | 长沙永昌车辆零部件有限公司 | Rubber tube outer surface polishing device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114833652B (en) | 2023-12-26 |
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