CN114932268B - Beveling machine device with profiling processing capability - Google Patents
Beveling machine device with profiling processing capability Download PDFInfo
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- CN114932268B CN114932268B CN202210619237.2A CN202210619237A CN114932268B CN 114932268 B CN114932268 B CN 114932268B CN 202210619237 A CN202210619237 A CN 202210619237A CN 114932268 B CN114932268 B CN 114932268B
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- 230000005540 biological transmission Effects 0.000 claims description 57
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 37
- 239000010959 steel Substances 0.000 abstract description 37
- 238000000034 method Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 238000003754 machining Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D79/00—Methods, machines, or devices not covered elsewhere, for working metal by removal of material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
- Machine Tool Units (AREA)
Abstract
The invention provides a beveling machine device with profiling processing capability, which comprises: the main tool rest seat is longitudinally arranged, and a side driving wheel, an end surface profiling wheel and a bevel tool are arranged at the lower part of the main tool rest seat side by side; the clamping arm is transversely arranged, and the fixed end of the clamping arm is arranged at the upper part of the main tool rest seat; the guide auxiliary frame is arranged at the free end of the clamping arm, the lower end of the guide auxiliary frame is provided with a guide wheel through an elastic part, and the guide wheel and the side driving wheel are arranged in parallel in opposite directions; an auxiliary plate longitudinally arranged and configured as a track for the guide wheel to travel. The structure of the invention enables the side driving wheel to cling to the side of the vertical steel plate under the elastic action of the elastic part, thereby achieving the function of side profiling; the guide wheel is downwards deflected by 5-10 degrees, a downward component force is generated in the advancing process, so that the end surface profiling wheel is tightly attached to the end surface of the vertical steel plate, and the end surface profiling effect is achieved.
Description
Technical Field
The invention belongs to the technical field of machining equipment, and particularly relates to a beveling machine device with profiling processing capability.
Background
The beveling machine is mainly used for machining corners of plates, and in the prior art, most of beveling machines for beveling horizontally placed steel plates in a machining workshop are lack of beveling machines for beveling vertically placed steel plates, and particularly for beveling vertically placed steel plates on site. The operation working condition is different from that of the flat steel plate, and the groove processing of the vertical steel plate has higher operation difficulty.
In the groove processing process of the vertical steel plate, the fluctuation of the local position of the end surface of the vertical steel plate is also a problem to be considered, and in the groove operation with high requirements, the fluctuation section should have the same groove degree as the flat section, and should not have multiple slopes or fewer slopes.
Disclosure of Invention
Aiming at the problems existing in the background technology, the invention provides a beveling machine device with profiling processing capability, which can well process grooves on a vertical steel plate.
In order to solve the technical problems, the invention adopts the following technical scheme:
a beveling machine apparatus having profiling capability, comprising:
the main tool rest seat is longitudinally arranged, a profiling groove structure is arranged at the lower part of the main tool rest seat, and the profiling groove structure comprises a side driving wheel, an end surface profiling wheel and a groove cutter which are arranged side by side;
the clamping arm is transversely arranged, and the fixed end of the clamping arm is arranged at the upper part of the side surface of the main tool rest seat;
the guide auxiliary frame is arranged at the free end of the clamping arm, the lower end of the guide auxiliary frame is provided with a guide wheel through an elastic part, and the guide wheel and the side driving wheel are arranged in parallel in opposite directions;
an auxiliary plate longitudinally arranged and configured as a track for the guide wheel to travel.
Further, the elastic component is a spring telescopic rod, one end of the spring telescopic rod is fixedly arranged at the lower end of the guide auxiliary frame, and the other end of the spring telescopic rod is provided with the guide wheel.
Further, the elastic component is a spring telescopic rod and the spring telescopic rod adopts a rectangular spring.
Further, the rotation direction of the guide wheel is downwards deviated by 5-10 degrees relative to the advancing direction of the guide wheel.
The device further comprises a threaded transmission structure, wherein the threaded transmission structure comprises a transmission screw, a transmission through hole and a transmission threaded hole, the transmission screw is transversely arranged, and the transmission screw is rotatably inserted into the transmission through hole and axially and relatively fixed with the transmission through hole, and is in threaded transmission connection with the transmission threaded hole; the transmission through hole and the transmission threaded hole are arranged on the clamping arm, and the other transmission through hole and the transmission threaded hole are arranged on the guide auxiliary frame.
Still further, the drive screw with the transmission through-hole passes through needle bearing and connects, needle bearing's lateral wall with the transmission through-hole is fixed mutually, needle bearing's inside wall with the drive screw is fixed mutually.
Still further, the number of the thread transmission structures is more than 2.
Still further, the guide auxiliary frame transversely slides and sets up at the centre gripping arm free end, the centre gripping arm free end is provided with horizontal slide hole, be provided with the axle that slides on the guide auxiliary frame, the axle sliding connection that slides is in the horizontal slide hole.
Further, the number of the profiling groove structure, the clamping arms and the guide auxiliary frames is 2.
Still further, 2 guide auxiliary frames are connected through the tie beam.
Further, a counterweight is arranged at the free end of the clamping arm.
Compared with the prior art, the invention has the following beneficial effects:
1. the side surface and the end surface of the vertical steel plate are square through the side surface driving wheel and the end surface profiling wheel.
2. The side driving wheel is tightly attached to the side surface of the vertical steel plate under the elastic action of the elastic part, so that the side surface profiling effect is achieved; the guide wheel is downwards deflected by 5-10 degrees, a downward component force is generated in the advancing process, so that the end surface profiling wheel is tightly attached to the end surface of the vertical steel plate, and the end surface profiling effect is achieved.
3. The spring telescopic rod adopts a rectangular spring, so that high elasticity can be generated, and the whole beveling machine device is stably clamped on the whole vertical steel plate and the auxiliary flat plate.
Drawings
FIG. 1 is a schematic diagram of a beveling machine apparatus with profiling capability;
FIG. 2 is a front view of the device of FIG. 1;
FIG. 3 is a left side schematic view of the clamp arm and guide subframe;
FIG. 4 is a cross-sectional view of the structure of FIG. 3 taken along line B-B;
fig. 5 is a schematic diagram of the beveling of an arc using the present beveling machine apparatus in the field.
Wherein, 10-the main tool holder seat; 11-side drive wheels; 12-end surface profiling wheels; 13-a groove cutter; 20-clamping arms; 21-a transverse slide hole; 30-guiding auxiliary frames; 31-an elastic member; 32-guiding wheels; 33-a slip shaft; 41-a drive screw; 42-transmission through holes; 43-a drive screw hole; 44-needle bearings; 50-auxiliary plate.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
As shown in fig. 1, a beveling machine device with profiling capability, comprising:
a main tool rest base 10 longitudinally arranged, wherein a profiling groove structure is arranged at the lower part of the main tool rest base 10, and comprises a side driving wheel 11, an end surface profiling wheel 12 and a groove cutter 13 which are arranged side by side;
a clamping arm 20 transversely arranged, wherein a fixed end of the clamping arm 20 is arranged at the upper part of the side surface of the main tool rest seat 10;
a guide auxiliary frame 30 provided at a free end of the grip arm 20, wherein a guide wheel 32 is provided at a lower end of the guide auxiliary frame 30 via an elastic member 31, and the guide wheel 32 is provided side by side opposite to the side driving wheel 11;
an auxiliary plate 50 longitudinally disposed and serving as a track for the guide wheel 32 to travel.
When a certain corner of the vertical steel plate A is required to be beveled at the right upper side edge angle in the figure 2, the main cutter frame seat 10 is placed on the vertical steel plate A, the end surface profiling wheel 12 is placed on the upper end surface of the vertical steel plate A, the side surface driving wheel 11 is propped against the left side surface of the vertical steel plate A, the auxiliary flat plate 50 is parallel or approximately parallel to the vertical steel plate A and is fixed, the guide wheel 32 is placed on the auxiliary flat plate 50, the elastic part 31 applies pressure to the guide wheel 32, the guide wheel 32 and the side surface driving wheel 11 integrally clamp the vertical steel plate A and the auxiliary flat plate 50 together, the beveling machine device is started, the beveling cutter 13 is used for beveling, meanwhile, the side surface driving wheel 11 rotates to drive the whole device to move along the upper end surface of the vertical steel plate A, the whole corner is gradually machined, in the advancing process, the side surface driving wheel 11 is always attached to the side surface of the vertical steel plate A due to the pressure given by the elastic part 31, the gravity applied by the whole beveling machine device ensures that the end surface profiling wheel 12 is always attached to the upper end surface of the vertical steel plate A, and even if the end surface of the side surface profiling wheel 13 is attached to the upper end surface of the vertical steel plate A along with the bevel cutter 13, and the bevel cutter 13 is also the same as the position of the bevel profiling section is ensured.
The side driving wheel 11 and the bevel blade 13 are driven by motors, and the driving is realized by adopting the conventional prior art, for example, a traveling motor and a bevel motor are arranged on the main tool rest seat 10, the output shafts of the traveling motor and the bevel motor are respectively in transmission connection with the side driving wheel 11 and the bevel blade 13, the traveling motor drives the side driving wheel 11 to rotate so as to drive the whole device to travel, the bevel motor drives the bevel blade 13 to process a bevel, and the bevel blade 13 can adopt a milling cutter.
Further, the elastic member 31 is a spring telescopic rod, one end of which is fixedly disposed at the lower end of the auxiliary guide frame 30, and the other end of which is provided with the guide wheel 32. As shown in fig. 1 to 5, the elastic member 31 is embodied as a spring expansion rod, and the guide wheel 32 is pressed by compression of the spring expansion rod.
Still further, the elastic member 31 is a spring expansion link and the spring expansion link adopts a rectangular spring. As shown in fig. 1 to 5, the spring telescopic rod adopts a rectangular spring as a compression spring to realize the telescopic movement of the spring telescopic rod, the clamping force generated by the elastic force of the elastic component 31 is used for stably clamping the whole beveling machine device on the whole of the vertical steel plate a and the auxiliary flat plate 50, a quite large clamping force is needed, the rectangular spring has a higher elastic coefficient, and the rectangular spring, such as an ultrahigh-load rectangular spring, can generate quite large elastic force, so that the whole beveling machine device is stably clamped on the whole of the vertical steel plate a and the auxiliary flat plate 50.
Further, the rotation direction of the guide wheel 32 is downward biased by 5 ° to 10 ° with respect to the traveling direction thereof. Or the plane in which the guide wheel 32 rotates is deviated 5-10 degrees downwards relative to the travelling direction of the guide wheel, as shown in fig. 3, the arrow beside the letter V indicates the travelling direction of the guide wheel 32, the guide wheel 32 slightly deflects downwards, a downward force is generated in the travelling process of the guide wheel, the end surface profiling wheel 12 is kept to be always pressed on the vertical steel plate a, and machining deviation caused by jolt jump is prevented. When the vertical steel plate A presents a certain radian, the effect of the downward deflection of the rotation direction of the guide wheel 32 by 5-10 degrees relative to the advancing direction of the vertical steel plate A is particularly remarkable, for example, when the vertical steel plate A is an arc plate with an angle of 90 degrees, the advancing square of the whole beveling machine device is gradually changed into the vertical direction from the horizontal direction, the deflection of the guide wheel 32 causes the guide wheel 32 to pull the end surface profiling wheel 12 to generate a component force perpendicular to the arc end surface of the vertical steel plate A when rotating, and the end surface profiling wheel 12 is kept to be pressed on the vertical steel plate A all the time.
Fig. 5 is a schematic diagram illustrating the on-site beveling of a section of 90 ° arc using the beveling machine, the arc being of a large size relative to the beveling machine, and only a portion of the arc being cut for clarity. The beveling machine device carries out beveling on a vertical steel plate A (an arc-shaped plate, the processing end surface of which is arc-shaped), a rib plate is supported between the vertical steel plate A and an auxiliary flat plate 50, and the auxiliary flat plate 50 is placed on the rib plate.
Further, the device also comprises a threaded transmission structure, wherein the threaded transmission structure comprises a transmission screw 41, a transmission through hole 42 and a transmission threaded hole 43, the transmission screw 41 is transversely arranged, the transmission screw 41 is rotatably inserted into the transmission through hole 42 and is axially and relatively fixed with the transmission through hole 42, and the transmission screw 41 is in threaded transmission connection with the transmission threaded hole 43; the transmission through hole 42 and the transmission threaded hole 43 are provided one on the clamp arm 20 and the other on the guide sub-frame 30. As shown in fig. 4, the connection between the auxiliary guide frame 30 and the clamping arm 20 is realized through a threaded transmission structure, so that the auxiliary guide frame 30 is arranged at the free end of the clamping arm 20, the transmission screw 41 points to the main tool rest seat 10, the transmission screw 41 is rotated to drive the auxiliary guide frame 30 to move transversely, the guide wheel 320 is close to or far away from the side driving wheel 11, and the arrangement can play a role of both, on one hand, the installation position of the auxiliary flat plate 50 and the vertical steel plate a have different distances, so that the position of the guide wheel 320 needs to be adjusted accordingly, on the other hand, the compression degree of the elastic component 31 can be adjusted by screwing the transmission screw 41, enough elastic force is generated, so that the vertical steel plate a and the auxiliary flat plate 50 are clamped well, and the whole beveling machine device is stably clamped on the whole vertical steel plate a and the auxiliary flat plate 50. In the embodiment shown in fig. 4, the transmission through hole 42 is provided on the clamp arm 20, and the transmission screw hole 43 is provided on the guide sub-frame 30, and it should be noted that the positions where the transmission through hole 42 and the transmission screw hole 43 are provided may be interchanged.
Still further, the drive screw 41 and the drive through hole 42 are connected by a needle bearing 44, an outer side wall of the needle bearing 44 is fixed to the drive through hole 42, and an inner side wall of the needle bearing 44 is fixed to the drive screw 41. As shown in fig. 4, the drive screw 41 is rotatably connected to the drive through hole 42 and is axially fixed relative to the drive through hole 42 by a needle bearing 44.
Still further, the number of the thread transmission structures is more than 2. More than 2 screw driving structures, together, allow the guide auxiliary frame 30 to be more firmly arranged on the clamping arm 20.
Still further, the auxiliary guide frame 30 is disposed at the free end of the clamping arm 20 in a sliding manner, the free end of the clamping arm 20 is provided with a sliding hole 21, the auxiliary guide frame 30 is provided with a sliding shaft 33, and the sliding shaft 33 is slidably connected in the sliding hole 21. As shown in fig. 4, the sliding connection of the sliding shaft 33 and the lateral sliding hole 21 plays a guiding role, and at the same time, when only one set of screw driving structure is provided, the cooperation of the sliding shaft 33 and the lateral sliding hole 21 can stabilize the guiding auxiliary frame 30 against swinging about the driving screw 41.
Further, the number of the profiling groove structure, the clamping arms 20 and the guiding auxiliary frames 30 is 2. As shown in fig. 1, the number of the clamping arms 20, the guide auxiliary frames 30 and the guide wheels 32 is 2, that is, the number of the structures shown in fig. 3 is 2, so that the device is more stable in the walking process.
Still further, the 2 guide auxiliary frames 30 are connected by a connection beam 34. As shown in fig. 1, the guide auxiliary frames 30 are connected together by the connection beams 34, so that the structure is more secure.
Further, a weight 22 is provided at the free end of the clamping arm 20. The weight of the free end of the clamping arm 20 is increased by the balancing weight 22 to balance the weight of the main tool rest base 10 side, so that the center of the whole device is as close to the longitudinal direction of the end surface profiling wheel 12 as possible, and the whole device is more stable.
It should be understood that parts of the specification not specifically set forth herein are all prior art.
It should be understood that the foregoing description of the preferred embodiments is not intended to limit the scope of the present patent, but that the person skilled in the art can make substitutions or modifications without departing from the scope of the patent claims, and the scope of the patent claims shall be based on the appended claims.
Claims (8)
1. A beveling machine apparatus having profiling capability, comprising:
the main tool rest seat (10) is longitudinally arranged, a profiling groove structure is arranged at the lower part of the main tool rest seat (10), and comprises side driving wheels (11), end surface profiling wheels (12) and a groove cutter (13) which are arranged side by side;
a clamping arm (20) which is transversely arranged, wherein the fixed end of the clamping arm (20) is arranged at the upper part of the side surface of the main tool rest seat (10);
the guide auxiliary frame (30) is arranged at the free end of the clamping arm (20), a guide wheel (32) is arranged at the lower end of the guide auxiliary frame (30) through an elastic part (31), the guide wheel (32) and the side driving wheel (11) are arranged in opposite side by side, the elastic part (31) is a spring telescopic rod, one end of the elastic part is fixedly arranged at the lower end of the guide auxiliary frame (30), and the other end of the elastic part is provided with the guide wheel (32);
an auxiliary flat plate (50) longitudinally arranged and serving as a track for the guide wheel (32) to travel;
the screw thread transmission structure comprises a transmission screw (41), a transmission through hole (42) and a transmission threaded hole (43), wherein the transmission screw (41) is transversely arranged, the transmission screw (41) is rotatably inserted into the transmission through hole (42) and is axially and relatively fixed with the transmission through hole (42), and the transmission screw (41) is in screw thread transmission connection with the transmission threaded hole (43); the transmission through hole (42) and the transmission threaded hole (43), one of which is arranged on the clamping arm (20) and the other of which is arranged on the guide auxiliary frame (30);
the transmission screw (41) points to the main tool rest seat (10), and the transmission screw (41) drives the guide auxiliary frame (30) to transversely move when rotating so as to adjust the compression degree of the elastic component (31), thereby adjusting the acting force of the guide wheel (32) on the auxiliary flat plate (50).
2. The beveling machine device with profiling capability according to claim 1, characterized in that the elastic element (31) is a spring telescopic rod and that the spring telescopic rod adopts a rectangular spring.
3. The beveling machine device with profiling capability according to claim 1, characterized in that the direction of rotation of the guiding wheel (32) is offset downwards by 5 ° to 10 ° with respect to its direction of travel.
4. The beveling machine device with profiling capability according to claim 1, characterized in that the drive screw (41) and the drive through hole (42) are connected by a needle bearing (44), the outer side wall of the needle bearing (44) is fixed with the drive through hole (42), and the inner side wall of the needle bearing (44) is fixed with the drive screw (41).
5. The profiling enabled beveling machine device of claim 1 wherein the number of threaded drive structures is greater than 2.
6. The beveling machine device with profiling capability according to claim 1, characterized in that the guiding auxiliary frame (30) is arranged at the free end of the clamping arm (20) in a transversely sliding way, the free end of the clamping arm (20) is provided with a transverse sliding hole (21), the guiding auxiliary frame (30) is provided with a sliding shaft (33), and the sliding shaft (33) is connected in the transverse sliding hole (21) in a sliding way.
7. The beveling machine with profiling capability as defined in any one of claims 1-6, wherein the number of profiling groove structures, clamping arms (20) and guiding auxiliary frames (30) is 2.
8. The profiling machine device according to claim 7, characterized in that the 2 guiding auxiliary frames (30) are connected by means of a connecting beam (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210619237.2A CN114932268B (en) | 2022-06-01 | 2022-06-01 | Beveling machine device with profiling processing capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210619237.2A CN114932268B (en) | 2022-06-01 | 2022-06-01 | Beveling machine device with profiling processing capability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114932268A CN114932268A (en) | 2022-08-23 |
| CN114932268B true CN114932268B (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210619237.2A Active CN114932268B (en) | 2022-06-01 | 2022-06-01 | Beveling machine device with profiling processing capability |
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| CN (1) | CN114932268B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201058398Y (en) * | 2007-07-24 | 2008-05-14 | 中煤张家口煤矿机械有限责任公司 | Median plate sloping hatch roll-over cutter |
| CN101502891A (en) * | 2009-03-05 | 2009-08-12 | 苗建春 | Tracking profiling bevel milling machine |
| JP2013103316A (en) * | 2011-11-16 | 2013-05-30 | Nippon Eiki Kk | Method and device for chamfering or beveling of metal disk workpiece |
| CN103406636A (en) * | 2013-05-17 | 2013-11-27 | 中煤张家口煤矿机械有限责任公司 | Middle plate bi-directional gas cutting chamfering equipment |
| CN108296532A (en) * | 2018-03-30 | 2018-07-20 | 油特机械工具（大连）有限公司 | Numerical control block port profiling bevel cuts milling apparatus |
| CN109605480A (en) * | 2018-11-19 | 2019-04-12 | 淮安市欣易佳塑业科技有限公司 | A kind of full-automatic wall patch profiling bead cutter |
| CN211438256U (en) * | 2019-12-17 | 2020-09-08 | 河南卫华重型机械股份有限公司 | Stainless steel plate part groove milling device |
-
2022
- 2022-06-01 CN CN202210619237.2A patent/CN114932268B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201058398Y (en) * | 2007-07-24 | 2008-05-14 | 中煤张家口煤矿机械有限责任公司 | Median plate sloping hatch roll-over cutter |
| CN101502891A (en) * | 2009-03-05 | 2009-08-12 | 苗建春 | Tracking profiling bevel milling machine |
| JP2013103316A (en) * | 2011-11-16 | 2013-05-30 | Nippon Eiki Kk | Method and device for chamfering or beveling of metal disk workpiece |
| CN103406636A (en) * | 2013-05-17 | 2013-11-27 | 中煤张家口煤矿机械有限责任公司 | Middle plate bi-directional gas cutting chamfering equipment |
| CN108296532A (en) * | 2018-03-30 | 2018-07-20 | 油特机械工具（大连）有限公司 | Numerical control block port profiling bevel cuts milling apparatus |
| CN109605480A (en) * | 2018-11-19 | 2019-04-12 | 淮安市欣易佳塑业科技有限公司 | A kind of full-automatic wall patch profiling bead cutter |
| CN211438256U (en) * | 2019-12-17 | 2020-09-08 | 河南卫华重型机械股份有限公司 | Stainless steel plate part groove milling device |
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| CN114932268A (en) | 2022-08-23 |
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