CN115229634B - Double-station direct grinding machine - Google Patents
Double-station direct grinding machine Download PDFInfo
- Publication number
- CN115229634B CN115229634B CN202210861294.1A CN202210861294A CN115229634B CN 115229634 B CN115229634 B CN 115229634B CN 202210861294 A CN202210861294 A CN 202210861294A CN 115229634 B CN115229634 B CN 115229634B
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- station
- clamping
- speed reducing
- machine
- grinding tool
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- 230000009467 reduction Effects 0.000 claims abstract description 26
- 230000002093 peripheral effect Effects 0.000 claims description 21
- 230000007246 mechanism Effects 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 abstract description 7
- 230000009471 action Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000007792 addition Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000817 safety factor Toxicity 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
- B24B27/00—Other grinding machines or devices
- B24B27/0023—Other grinding machines or devices grinding machines with a plurality of working posts
-
- 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
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
-
- 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
- B24B45/00—Means for securing grinding wheels on rotary arbors
-
- 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
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
The invention relates to a double-station direct grinding machine, which is provided with two stations for installing grinding tools of different types, and comprises a machine body part and a machine head part, wherein the forefront end of the machine head part is provided with a handle clamping head, the middle section of the machine head part is provided with a central hole clamping station coaxially arranged with the handle clamping head, a power shaft in the machine body part is in power connection with the machine head part, the handle clamping head is provided with the handle grinding tools, and the central hole clamping station is provided with a center Kong Moju. The invention is additionally provided with a station for clamping the grinding tool in a mode of installing the central hole at the rear part of the original clamping station, the station has two working modes, namely, the station is fixedly rotated in situ, and the station is additionally slipped in the outer axial direction of the rotation, so that a user can select different grinding tools according to the needs, different working modes are provided, the slipping function can enable the user to reduce the hand motion and reduce the fatigue feeling, thereby realizing multiple purposes of one machine, and the planetary gear speed reduction assembly is adopted to reduce and increase the moment.
Description
Technical Field
The invention belongs to the technical field of direct grinding machines, and particularly relates to a direct grinding machine with double stations.
Background
The straight grinder is designed to be used in a place with narrow space or a workpiece with special shapes or dense calandria, the handle clamping head can only clamp the handle grinder, in view of safety factors, the handle grinder is designed to be much smaller than the grinder in a central hole mounting mode, the handle grinder cannot be excessively large or the handle is easily separated from the grinder to be broken in a force application mode, the central hole mounting mode clamps the grinder from two end faces, the stability of the straight grinder is far higher than that of the handle grinder only in a single point during rotation operation, the size of the grinder is relatively large, a certain force can be applied to enable the grinding amount to be improved, the center Kong Moju is suitable when the grinding amount is large or rough machining is achieved, and therefore, the workpiece often needs to be ground with various grinding tools.
Disclosure of Invention
Aiming at the defects existing in the prior art, the technical problem to be solved by the invention is to add a clamping station with a central hole installation mode in the straight grinding machine, and the clamping station and the original clamping station can be used simultaneously.
The invention aims at realizing the following technical scheme: the utility model provides a duplex position straight mill, has two stations of installing different grade type grinding apparatus, includes fuselage part and aircraft nose part, and the forefront of aircraft nose part is the handle clamping head, and the interlude of aircraft nose part is the centre bore clamping station that sets up with the handle clamping head is coaxial, and power shaft in the fuselage part is connected with the aircraft nose part power, installs at the handle clamping head for handle type grinding apparatus, installs at centre Kong Moju of centre bore clamping station.
Preferably, the central hole clamping station comprises a speed reducing mechanism for providing power, a slipping clamping assembly connected with the speed reducing mechanism, and a speed reducing box shell for installing the speed reducing mechanism, wherein one end of the speed reducing box shell is fixedly connected with the machine body part, and the other end of the speed reducing box shell is a free end. The center hole clamping station is provided with a speed reduction and distance increase function, and the center hole clamping station and the original handle rod clamping head have different rotating speeds so as to provide different polishing effects.
Preferably, the speed reducing mechanism comprises a planetary speed reducing assembly, a central shaft of the planetary speed reducing assembly is rotatably sleeved on the outer peripheral surface of the power shaft, an inner gear ring of the planetary speed reducing assembly is fixed in a speed reducing box shell, the speed reducing mechanism further comprises a mounting shaft, one end of the mounting shaft is fixedly connected with a planet carrier of the mounting shaft, the other end of the mounting shaft is close to the power shaft, and the input end of the planetary speed reducing assembly is connected with the mounting shaft through a connecting sleeve sleeved on the outer peripheral surface of the power shaft. The planetary speed reduction mode is small in structure, parts are matched stably, and the planetary speed reduction mode is convenient to set up in a grading manner.
Preferably, the slidable clamping assembly comprises a spline shaft sleeve coaxially and fixedly arranged on the outer peripheral surface of the mounting shaft, a grinding tool clamping seat matched with the spline on the outer peripheral surface of the spline shaft sleeve, the grinding tool clamping seat can slide tightly, threads are arranged on the whole outer peripheral surface of the grinding tool clamping seat, a fastening nut used for fastening the grinding tool is matched with the threads of the grinding tool clamping seat, a backstop nut arranged on the spline shaft sleeve is fixed, a jacking spring is arranged between the backstop nut and the grinding tool clamping seat, and the jacking spring is connected with the outer peripheral threads of the grinding tool clamping seat and is used for fastening a cylindrical cam of the grinding tool together with the fastening nut. The spline shaft sleeve and the grinding tool clamping seat are matched, so that power transmission is realized, and the function of relative sliding is also realized.
Preferably, the diameter of the outer peripheral surface of one end, close to the handle rod clamping head, of the retaining nut is the same as that of the grinding tool clamping seat, and the retaining nut and the grinding tool clamping seat can be connected through the cylindrical cam in reversing connection, so that the pressing spring is disabled.
Preferably, the reduction gearbox housing has one end provided with a mounting surface for connection to the fuselage section and the other end provided with a cam contact roller for cooperation with a cam of the cylindrical cam. The roller is contacted and matched with the cylindrical cam surface to increase the smoothness of operation.
Preferably, the middle section of the reduction gearbox shell is a reduction installation area; the inner gear ring is fixedly connected in the speed reduction installation area, and the planet carrier can rotate to transmit speed reduction power. Planetary reduction has many advantages and is very low cost in an axial design.
In summary, compared with the prior art, the invention has the following advantages:
the invention is additionally provided with a station for clamping the grinding tool in a mode of installing a central hole at the rear part of the original clamping station, the station has two working modes, namely, the station is fixedly rotated in situ, and the station is additionally slipped in the outer axial direction of the rotation, so that a user can select different grinding tools according to the needs, different working modes are adopted, the slipping function can enable the user to reduce the hand action and reduce the fatigue feeling, thereby realizing multiple purposes of one machine, and the power aspect of the machine refers to the power of the direct grinding machine as the power of the additional function of the machine, and the planetary gear speed reducing assembly is adopted for speed reduction and moment increase.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the holder of the grinding tool;
FIG. 3 is a schematic diagram of a nose portion of a central bore clamping station that is reciprocally slidable and rotatable within a range of axial directions;
FIG. 4 is a schematic diagram of a portion of a head with a center hole clamping station fixed for in-situ rotation;
FIG. 5 is a schematic view of the structure of a cylindrical cam;
FIG. 6 is a schematic structural view of a spline shaft sleeve;
fig. 7 is a schematic view of a combination of a mounting shaft and a power shaft.
The marks in the figure:
the machine comprises a machine body part 01, a machine head part 02, a power shaft 03, a handle clamping head 100, a central hole clamping station 200, a speed reducing mechanism 210, a planetary speed reducing assembly 211, a mounting shaft 212, a connecting sleeve 213, a slidable clamping assembly 240, a spline shaft 241, a grinding tool clamping seat 242, a fastening nut 243, a retaining nut 244, a pressing spring 245, a cylindrical cam 246, a reduction gearbox housing 220, a handle grinding tool m1, a center Kong Moju m2, a mounting surface 221, a cam contact roller 222 and a speed reducing mounting area 223.
Detailed Description
The invention is further described below with reference to embodiments shown in the drawings in which:
example 1
As shown in fig. 1, the double-station direct grinding machine is provided with two stations for installing grinding tools of different types, one is a clamping handle type grinding tool, the other is a grinding tool clamping station for clamping a central hole, the two stations can be synchronously used or independently used, and the station for clamping the central hole can also slide back and forth along the axial direction when rotating, so that the back and forth movement of hands is reduced, and the fatigue of the hands is relieved; the device comprises a machine body part 01 and a machine head part 02, wherein a power shaft 03 in the machine body part 01 is in power connection with the machine head part 02, the forefront end of the machine head part 02 is provided with a handle clamping head 100, and the middle section of the machine head part 02 is provided with a central hole clamping station 200 which is coaxially arranged with the handle clamping head 100; in fig. 1, the handle grip 100 is a handle grinder m1, the handle grip 100 is mounted at the center Kong Moju m2 of the center hole grip station 200, the center hole grip 100 outputs the rotation speed of the original straight grinder, and the center hole grip station 200 outputs the rotation speed after deceleration, and the rotation speeds are different, so that the rotation speeds are selected according to the product characteristics when in use.
As shown in fig. 3-4, the center hole clamping station 200 operates in two modes: the device is fixed in-situ rotation, and can slide back and forth and rotate in a certain axial range, and the second action mode is provided with the combination of synchronous actions in two directions of back and forth sliding and rotation, so that the polishing or polishing area can be increased, and the surface of a workpiece to be acted on can obtain more uniform treatment effect, and the device specifically comprises a speed reducing mechanism 210 for providing power, a slipping clamping assembly 240 connected with the speed reducing mechanism 210, and a speed reducing box shell 220 for installing the speed reducing mechanism 210, wherein one end of the speed reducing box shell is fixedly connected with a machine body part 01, and the other end of the speed reducing box shell is a free end;
the speed reducing mechanism 210 comprises a planetary speed reducing assembly 211, a central shaft of the planetary speed reducing assembly 211 is rotatably sleeved on the outer peripheral surface of the power shaft 03, an inner gear ring of the planetary speed reducing assembly 211 is fixed in a speed reducing box shell 220, the speed reducing mechanism further comprises a mounting shaft 212, one end of the mounting shaft is fixedly connected with a planet carrier of the mounting shaft, the other end of the mounting shaft is close to the handle rod clamping head 100, and an input end of the planetary speed reducing assembly 211 is connected through a connecting sleeve 213 sleeved on the outer peripheral surface of the power shaft 03; in use, the power shaft 03 transmits power to the planet wheels through the connecting sleeve 213, so that speed reduction is achieved, and the planet carrier transmits the power to the mounting shaft 212, so that a speed reduction and moment increase effect is achieved.
The slidable clamping assembly 240 comprises a spline shaft sleeve 241 coaxially and fixedly arranged on the outer peripheral surface of the mounting shaft 212, a grinding tool clamping seat 242 which is matched with the spline of the outer peripheral surface of the spline shaft sleeve 241 and can slide tightly, threads are arranged on the whole outer peripheral surface of the grinding tool clamping seat 242, a fastening nut 243 matched with the threads of the grinding tool clamping seat 242 and used for fastening a grinding tool, a non-return nut 244 which is fixedly arranged on the spline shaft sleeve 241 and is close to one end of the handle rod clamping head 100, the outer peripheral surface of the non-return nut 244 is provided with the same diameter and the same thread type as those of the grinding tool clamping seat 242, a pressing spring 245 arranged between the non-return nut 244 and the grinding tool clamping seat 242, and a cylindrical cam 246 which is in threaded connection with the outer peripheral surface of the grinding tool clamping seat 242 and is jointly used for fastening the grinding tool with the fastening nut 243; the cylindrical cam 246 has the same protruding or concave size at the same diameter position so as to enable the cylindrical cam 246 to be in contact with the symmetrical cam contact roller up and down simultaneously during rotation and increase the sliding stability during rotation, wherein the cylindrical cam 246 plays two roles, namely, the cylindrical cam 246 and the fastening nut 243 are matched together to clamp the fixed center Kong Moju m2 to play a role in fastening, and the cylindrical cam plays a role in converting rotation around the axial direction into linear movement along the axial direction; here, the outer diameter of the pressing spring 245 needs to be smaller than the diameter of the retaining nut 244 so as to be covered by the cylindrical cam 246.
As shown in fig. 5, one end of the reduction gearbox housing 220 is a mounting surface 221 connected to the body part 01, the other end is a cam contact roller 222 matched with a cam of a cylindrical cam 246, and the middle section of the reduction gearbox housing 220 is divided into a reduction mounting area 223; the inner gear ring is fixedly connected in the speed reduction mounting area 223, and the planet carrier can rotate to transmit speed reduction power;
as shown in fig. 1-7, in operation, the reduction gearbox housing 220 is fixed on the machine body part 01, the cylindrical cam 246 rotates and is in contact fit with the cam contact roller 222 all the time under the action of the pressing spring 245, so that the cylindrical cam 246 slides axially, and the grinding tool clamping seat 242 is pushed to slide axially and reciprocally along the spline shaft sleeve 241, namely, the center Kong Moju m2 mounted on the grinding tool clamping seat 242 also has reciprocating sliding action while rotating.
When the center hole clamping station 200 clamps, the cam end of the cylindrical cam 246 is screwed into the machine body along the peripheral thread of the grinding tool clamping seat 242, the position is adjusted, the grinding tool is locked, the outer shaft of the grinding tool clamping seat 242 is sleeved on the grinding tool along the same path, the grinding tool is abutted against the plane end of the cylindrical cam 246, the fastening nut 243 is screwed into place along the same path along the outer Zhou Luomu of the grinding tool clamping seat 242, and then the grinding tool is tightly clamped and fixed. As described above, the center hole clamping station 200 can provide two modes of action, namely a mode of reciprocating sliding rotation in a certain axial range, if the assembly positions of the cylindrical cam 246 and the fastening nut 243 are rotationally translated by 180 degrees, the assembly sequence is exchanged, and as shown in FIG. 4, the assembly sequence is a mode of fixing in-situ rotation, the principle is that the cylindrical cam 246 is used for threaded connection of the grinding tool clamping seat 242 and the retaining nut 244 together, and the intermediate pressing spring 245 fails after connection, so as to obtain the fixed in-situ rotation.
When in use, the utility model is characterized in that: if the operation is performed in a mode of 'reciprocating sliding rotation in a certain axial range', an operator firstly screws the cylindrical cam 246 in place, the cam end faces inwards, then sleeves the cylindrical cam into the center Kong Moju m2, screws the fastening nut 243 for locking, prepares for working, toggles the start switch of the direct grinding machine, at the moment, the power shaft 003 rotates, power is transmitted to the planetary gears through the connecting sleeve 213 and the sun gear on the planetary reduction assembly 211 on the connecting sleeve, so that speed reduction is formed and the power is transmitted to the mounting shaft 212 through the planetary carrier, and on one hand, the mounting shaft 212 transmits the power to the grinding tool clamping seat 242 through the spline shaft sleeve 241 to drive the grinding tool to rotate for doing work; at the same time, the cam end surface of the rotating cylindrical cam 246 is engaged with the fixed cam contact roller 222 and the reciprocating sliding of the grinder is realized under the combined action of the pressing spring 245.
If the mode of 'fixed in situ rotation' is selected for operation, the order of the grinding tools is changed, the fastening nuts 243 are screwed in place, the grinding tools are sleeved, the cylindrical cam 246 is screwed in again for locking, and the cam end faces outwards.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (4)
1. The double-station straight grinding machine is provided with two stations for installing grinding tools of different types, and comprises a machine body part (01) and a machine head part (02), and is characterized in that the forefront end of the machine head part (02) is a handle clamping head (100), the middle section of the machine head part (02) is a central hole clamping station (200) coaxially arranged with the handle clamping head (100), a power shaft (03) in the machine body part (01) is in power connection with the machine head part (02), the handle grinding tool (m 1) is installed on the handle clamping head (100), and the center Kong Moju (m 2) is installed on the central hole clamping station (200);
the center hole clamping station (200) comprises a speed reducing mechanism (210) for providing power, a slidable clamping assembly (240) connected with the speed reducing mechanism (210) and a speed reducing box shell (220) for installing the speed reducing mechanism (210) and with one end fixedly connected with the machine body part (01) and the other end being a free end;
the speed reducing mechanism (210) comprises a planetary speed reducing assembly (211), a central shaft of the planetary speed reducing assembly (211) is rotatably sleeved on the outer peripheral surface of the power shaft (03), an inner gear ring of the planetary speed reducing assembly is fixed in a speed reducing box shell (220), the speed reducing mechanism also comprises a mounting shaft (212) with one end fixedly connected with a planet carrier and the other end close to the power shaft (03), and an input end of the planetary speed reducing assembly (211) is connected through a connecting sleeve (213) sleeved on the outer peripheral surface of the power shaft (03); the slidable clamping assembly (240) comprises a spline shaft sleeve (241) coaxially and fixedly arranged on the outer peripheral surface of the mounting shaft (212), a grinding tool clamping seat (242) which can be matched with the spline on the outer peripheral surface of the spline shaft sleeve (241) and is provided with threads on the whole outer peripheral surface, a fastening nut (243) matched with the threads of the grinding tool clamping seat (242) and used for fastening a grinding tool, a retaining nut (244) fixedly arranged on the spline shaft sleeve (241), and a jacking spring (245) arranged between the retaining nut (244) and the grinding tool clamping seat (242), and a cylindrical cam (246) in threaded connection with the outer periphery of the grinding tool clamping seat (242) and jointly used for fastening the grinding tool with the fastening nut (243).
2. The double-station straight grinder according to claim 1, wherein the diameter of the outer peripheral surface of one end of the stop nut (244) close to the handle rod clamping head (100) is the same as that of the grinding tool clamping seat (242).
3. The twin-station direct mill according to claim 1, characterized in that the reduction gearbox housing (220) has a mounting surface (221) connected to the fuselage section (01) at one end and a cam contact roller (222) cooperating with a cam of a cylindrical cam (246) at the other end.
4. A double station direct grinding machine according to claim 3, characterized in that the intermediate section of the gearbox housing (220) is a reduction mounting zone (223); the inner gear ring is fixedly connected in a speed reduction installation area (223), and the planet carrier can rotate to transmit speed reduction power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210861294.1A CN115229634B (en) | 2022-07-20 | 2022-07-20 | Double-station direct grinding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210861294.1A CN115229634B (en) | 2022-07-20 | 2022-07-20 | Double-station direct grinding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115229634A CN115229634A (en) | 2022-10-25 |
| CN115229634B true CN115229634B (en) | 2023-11-24 |
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ID=83674624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210861294.1A Active CN115229634B (en) | 2022-07-20 | 2022-07-20 | Double-station direct grinding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115229634B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103121189A (en) * | 2011-11-21 | 2013-05-29 | 徐州市恒基伟业建材发展有限公司 | Handheld pneumatic composite motion hole grinding head |
| CN207289746U (en) * | 2017-09-29 | 2018-05-01 | 新昌县南明街道碧明园林苗木场 | A kind of auto parts and components polishing machine |
| CN111922809A (en) * | 2020-08-26 | 2020-11-13 | 浙江大学台州研究院 | Automatic fixture equipment for eccentric shaft grinding of cylindrical grinding machine |
| CN213381372U (en) * | 2020-10-09 | 2021-06-08 | 徐春初 | Dual-purpose angle grinder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111645036B (en) * | 2019-03-04 | 2023-09-29 | 株式会社牧田 | Work tool |
-
2022
- 2022-07-20 CN CN202210861294.1A patent/CN115229634B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103121189A (en) * | 2011-11-21 | 2013-05-29 | 徐州市恒基伟业建材发展有限公司 | Handheld pneumatic composite motion hole grinding head |
| CN207289746U (en) * | 2017-09-29 | 2018-05-01 | 新昌县南明街道碧明园林苗木场 | A kind of auto parts and components polishing machine |
| CN111922809A (en) * | 2020-08-26 | 2020-11-13 | 浙江大学台州研究院 | Automatic fixture equipment for eccentric shaft grinding of cylindrical grinding machine |
| CN213381372U (en) * | 2020-10-09 | 2021-06-08 | 徐春初 | Dual-purpose angle grinder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115229634A (en) | 2022-10-25 |
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