CN115573969B - Marine oil cylinder piston rod dirt cleaning structure and dirt cleaning method - Google Patents
Marine oil cylinder piston rod dirt cleaning structure and dirt cleaning method Download PDFInfo
- Publication number
- CN115573969B CN115573969B CN202211178448.3A CN202211178448A CN115573969B CN 115573969 B CN115573969 B CN 115573969B CN 202211178448 A CN202211178448 A CN 202211178448A CN 115573969 B CN115573969 B CN 115573969B
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- Prior art keywords
- piston rod
- ring
- block
- cleaning
- elastic
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- 238000004140 cleaning Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005299 abrasion Methods 0.000 claims abstract description 6
- 238000005202 decontamination Methods 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000003588 decontaminative effect Effects 0.000 claims description 5
- 230000004323 axial length Effects 0.000 claims description 4
- 230000005489 elastic deformation Effects 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 3
- 238000007790 scraping Methods 0.000 abstract description 7
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 239000000428 dust Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 4
- 239000004809 Teflon Substances 0.000 description 3
- 229920006362 Teflon® Polymers 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- 241000237502 Ostreidae Species 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 235000020636 oyster Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/20—Cleaning of moving articles, e.g. of moving webs or of objects on a conveyor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
The invention relates to a marine oil cylinder piston rod dirt cleaning structure, which is sleeved on a piston rod of an oil cylinder and moves relative to the piston rod; including the guide pin bushing, inlay and establish the spacing subassembly of elasticity at the guide pin bushing oral area, by the clean ring of spacing subassembly centre gripping of elasticity, spacing subassembly of elasticity includes: the elastic block is fixedly arranged at one side opening part of the guide sleeve, which is away from the cylinder body of the oil cylinder, the clamping gap is obliquely arranged on the elastic block, the oblique direction points to the piston rod, the cleaning ring is arranged in the clamping gap and comprises at least two ring bodies which are mutually attached, and the adjacent two ring bodies can be opened and closed. In the invention, marine organisms attached to the piston rod are scraped off in the reciprocating motion process of the piston rod. The cleaning ring has the function of slight elastic displacement in the scraping process; the elastic block timely compensates the abrasion loss of the dust-proof ring; the probability of part damage in the erasing process is reduced, and meanwhile, the tightness of the oil cylinder is not influenced.
Description
Technical Field
The invention relates to the technical field of marine oil cylinder accessories, in particular to a marine oil cylinder piston rod dirt cleaning structure and a dirt cleaning method.
Background
In the field of ship manufacturing, in particular to a ship using an external oil cylinder, a piston rod of the oil cylinder is exposed to seawater for a long time, marine organisms such as oyster, green-mouth shellfish and the like are easily adsorbed and grown on the piston rod, and the marine organisms are firmly attached to the piston rod; when the piston rod reciprocates and stretches, the organisms such as oyster can cause the conditions that the oil cylinder is blocked in operation, marine organisms enter the oil cylinder to damage sealing and the like.
Disclosure of Invention
The applicant provides a reasonable marine oil cylinder piston rod dirt cleaning structure and a dirt cleaning method aiming at the defects in the prior art, wherein the piston rod is sleeved with the dirt cleaning structure which is provided with a ring body capable of scraping marine organisms and has certain elasticity, and the seal structure can bear slight deformation in the scraping process, so that the seal structure of the oil cylinder is protected, and the reliability and the service life of the oil cylinder are improved.
The technical scheme adopted by the invention is as follows:
the marine oil cylinder piston rod dirt cleaning structure is sleeved on the oil cylinder piston rod and moves relative to the oil cylinder piston rod; comprises a guide sleeve, an elastic limiting component embedded at the opening of the guide sleeve, a cleaning ring clamped by the elastic limiting component,
the elastic limiting assembly comprises:
the elastic block is fixedly arranged at the opening part of one side of the guide sleeve, which is away from the cylinder body of the oil cylinder,
the clamping gap is obliquely arranged on the elastic block, the oblique direction points to the piston rod,
the cleaning ring is arranged in the clamping gap and comprises at least two ring bodies which are mutually attached, and the adjacent two ring bodies can be opened and closed.
As a further improvement of the above technical scheme:
the elastic blocks are at least two and are respectively pressed on two sides of the cleaning ring; elastic gaps are reserved between the elastic blocks positioned on one side of the cleaning ring surface, facing the piston rod, and the cleaning ring.
The elastic gap is as follows: the cleaning ring is inclined, and the side wall of the spring block and the wall surface of the piston rod enclose an area.
The bullet piece includes:
a first block body which is positioned on one side of the cleaning ring, which is away from the piston rod,
a second block body positioned on one side of the cleaning ring surface facing the piston rod,
the axial length of the first block is greater than that of the second block, and the end faces of the first block and the second block embedded into the shaft sleeve are flush.
The opening of the shaft sleeve is inwards concave to form an installation area, the first block body and the second block body are embedded into the installation area, and the opening of the shaft sleeve is folded towards the first block body to form a flanging pressed on the first block body.
The cleaning ring comprises a first ring body and a second ring body, the first ring body and the second ring body are mutually attached when in an initial state, and the end parts of the first ring body and the second ring body fall on the piston rod.
The end parts of the first ring body and the second ring body are wedge-shaped, and the inclined planes face to one side deviating from the piston rod.
The wedge-shaped surfaces of the first ring body and the second ring body are arranged at an included angle with the piston rod.
And a dustproof ring is connected between the guide sleeve and the piston rod, and the dustproof ring is lined below the elastic block.
A method for cleaning dirt by utilizing a marine oil cylinder piston rod dirt cleaning structure comprises the following steps:
conventional purge phase:
when the piston rod is retracted into the cylinder body, the end part of the cleaning ring falls on the outer wall of the piston rod and moves relative to the piston rod, and marine organisms attached to the piston rod are scraped by the cleaning ring;
high resistance removal stage:
when the connection strength between the marine organism and the piston rod is high, the cleaning ring is abutted against the marine organism in the retraction process of the piston rod, the cleaning ring transmits the reaction force to the first block body and the second block body, the first block body and the second block body deform, the first ring body and the second ring body are stressed and are separated, and the marine organism is scraped by the first ring body and the second ring body on the premise that the piston rod continuously applies force;
friction compensation phase:
when the thickness of the dustproof ring is thinned in the friction process, the elastic deformation of the elastic block compensates the abrasion thickness of the dustproof ring, and the cleaning ring is kept in a state of falling on the piston rod.
The beneficial effects of the invention are as follows:
the invention has compact and reasonable structure and convenient operation, and the marine organism attached to the piston rod is scraped in the reciprocating motion process of the piston rod by sleeving the dirt cleaning structure on the piston rod.
In the invention, marine organisms on the surface of the piston rod are scraped through the combination of the cleaning ring made of metal and the dust ring made of Teflon, wherein the cleaning ring made of metal is a main scraping part and has certain hardness; the dustproof ring made of the Teflon material has the characteristics of low friction, high wear resistance and high strength, and can reduce the influence caused by the friction force of the part in the reciprocating scraping process, besides the functions of playing a role in preventing impurities from being embedded into gaps.
According to the invention, the metal ring is used in a seawater environment, has the characteristics of seawater corrosion resistance, wear resistance and the like, and is matched with the elastic block for clamping the cleaning ring, so that the cleaning ring has a slight elastic displacement function in the scraping process.
The bullet piece adopts two blocks to cooperate and uses, and first block is spacing by the turn-ups, and the hypotenuse of first block compresses tightly clean ring, clean ring compresses tightly the inclined plane of below second block, and the second block compresses tightly the dust ring, realizes a turn-ups and compresses tightly the purpose of a plurality of parts.
In the use, during initial state, the elastic block slightly compresses, presses the dust ring on the piston rod to realize auxiliary sealing, and the compression amount of the elastic block can be close to the thickness of the dust ring so as to timely compensate the abrasion loss of the dust ring.
When the end of the cleaning ring is abutted against the marine organism, if the cleaning ring receives a larger reaction force, the cleaning ring arranged along the inclination is transmitted to the elastic block, and the deformation of the elastic block allows the displacement of the cleaning ring, so that the rigid damage caused by the immovable cleaning ring is prevented.
The elastic gap in the invention is used for allowing the deformation of the second block body, and a sufficient deformation space is reserved.
In the using process, the invention can erase marine organisms with various adhesive forces, the power comes from the piston rod, the probability of part damage in the erasing process is reduced by allowing displacement, and the tightness of the oil cylinder is not influenced.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a view of the embodiment of fig. 1, with the cleaning ring structure hidden.
Fig. 3 is a schematic structural view of another embodiment of the present invention.
Fig. 4 is a front view of a cleaning ring in accordance with the present invention.
Fig. 5 is a side view of a cleaning ring in accordance with the present invention.
Wherein: 1. guide sleeve; 2. an elastic limit component; 3. a cleaning ring; 4. a dust-proof ring; 5. an elastic gap;
101. flanging;
201. a clamping gap; 202. a first block; 203. a second block;
301. a first ring body; 302. and a second ring body.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
As shown in fig. 1-5, the marine oil cylinder piston rod dirt cleaning structure of the embodiment is sleeved on a piston rod of an oil cylinder and moves relative to the piston rod; comprises a guide sleeve 1, an elastic limiting component 2 embedded at the opening part of the guide sleeve 1, and a cleaning ring 3 clamped by the elastic limiting component 2,
the elastic limit assembly 2 includes:
the elastic block is fixedly arranged at the opening part of one side of the guide sleeve 1, which is away from the cylinder body of the oil cylinder,
the clamping gap 201 is obliquely arranged on the elastic block, the oblique direction points to the piston rod,
the cleaning ring 3 is disposed in the clamping gap 201, and the cleaning ring 3 includes at least two rings that are mutually attached, and two adjacent rings can be opened and closed.
The elastic blocks are at least provided with two elastic blocks, and are respectively pressed on two sides of the cleaning ring 3; elastic gaps 4 are reserved between the elastic blocks positioned on one side of the cleaning ring 3 facing the piston rod and the cleaning ring 3.
The elastic gap 4 is: the inclined cleaning ring 3, the side wall of the spring block and the wall surface of the piston rod.
The bullet piece includes:
a first block 202, located on the side of the cleaning ring 3 facing away from the piston rod,
a second block 203, located on the side of the cleaning ring 3 facing the piston rod,
the axial length of the first block 202 is larger than that of the second block 203, and the first block 202 and the second block 203 are flush with the end face of the embedded guide sleeve 1.
The opening of the guide sleeve 1 is concavely formed into an installation area, the first block 202 and the second block 203 are embedded into the installation area, and the opening of the guide sleeve 1 is turned over to the first block 202 to form a turnup 101 pressed on the first block 202.
The cleaning ring 3 comprises a first ring body 301 and a second ring body 302, the first ring body 301 and the second ring body 302 are mutually attached when in an initial state, and the ends of the first ring body 301 and the second ring body 302 fall on the piston rod.
The ends of the first ring body 301 and the second ring body 302 are wedge-shaped, and the inclined planes face to one side away from the piston rod.
The wedge surfaces of the first ring body 301 and the second ring body 302 are arranged at an included angle with the piston rod.
A dustproof ring 4 is connected between the guide sleeve 1 and the piston rod, and the dustproof ring 4 is lined below the elastic block.
The method for cleaning the marine oil cylinder piston rod dirt cleaning structure comprises the following steps:
conventional purge phase:
when the piston rod is retracted into the cylinder body, the end part of the cleaning ring 3 falls on the outer wall of the piston rod and moves relative to the piston rod, and marine organisms attached to the piston rod are scraped by the cleaning ring 3;
high resistance removal stage:
when the connection strength between the marine organism and the piston rod is high, the cleaning ring 3 is abutted against the marine organism in the retraction process of the piston rod, the cleaning ring 3 transmits the reaction force to the first block 202 and the second block 203, the first block 202 and the second block 203 deform, the first ring 301 and the second ring 302 are stressed and are separated, and the marine organism is scraped by the first ring 301 and the second ring 302 on the premise of continuously applying force to the piston rod;
friction compensation phase:
when the thickness of the dustproof ring 4 is thinned in the friction process, the elastic deformation of the elastic block compensates the abrasion thickness of the dustproof ring 4, and the cleaning ring 3 is kept in a state of falling on the piston rod.
The specific structure and working process of this embodiment are as follows:
as shown in fig. 1-3, the guide sleeve 1 is sleeved on the piston rod, the relative position of the guide sleeve 1 is fixed, and the piston rod moves relative to the guide sleeve 1. As the marine organisms are attached to the piston rod, the cleaning ring 3 is arranged on the guide sleeve 1 to scrape the marine organisms.
The specific structure of the cleaning ring 3 arranged on the guide sleeve 1 is as follows:
a groove is arranged at the opening part of the guide sleeve 1, a flange 101 is arranged at the outer diameter of the opening part of the groove, so that the opening part of the guide sleeve 1 forms an inward concave installation space, and a first block 202 and a second block 203 are installed in the installation space to fill the installation space. The opposite faces between the first block 202 and the second block 203 are inclined faces, that is, the first block 202 and the second block 203 which are annular parts each have a tapered face. Referring to the cross-sectional views in fig. 1 and 2, a first ring 301 and a second ring 302 are clamped between the first block 202 and the second block 203. The ends of the first ring 301 and the second ring 302 are propped against the piston rod.
In the invention, with reference to fig. 4 and 5, the first ring 301 and the second ring 302 both adopt structures with openings, the cambered surface positions of the first ring 301 and the second ring 302, which are contacted with the piston rod, are the positions with the openings, and the openings extend to the middle positions of the axial lengths of the first ring 301 and the second ring 302, so that the compression deformation of rubber can be matched, the tensioning force can be better provided, the decontamination effect is optimized, and meanwhile, the structures such as the piston rod and the like are not easy to damage.
In the process of erasing the marine organisms by the first ring body 301 and the second ring body 302, if the marine organisms with strong adhesive force are encountered, the first ring body 301 and the second ring body 302 can be relatively displaced through the elastic deformation of the first block body 202 and the second block body 203, so that the damage probability in the cleaning process is reduced.
In order to always maintain the tightness of the whole structure, the dustproof ring 4 is made of special polymer Teflon with low friction, high wear resistance and high strength in the embodiment. The cross section of the dustproof ring 4 is rectangular, as shown in fig. 3, and meanwhile, the rubber sealing ring is arranged on the dustproof ring 4, so that the sealing function of automatic compensation after abrasion is realized, the embedding of impurities is prevented, the dust scraping effect is improved, and the surface of the dustproof ring 4 is not damaged.
The above description is intended to illustrate the invention and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the invention.
Claims (5)
1. A method for cleaning the dirt by using the dirt cleaning structure of the piston rod of the marine oil cylinder is characterized in that: the marine oil cylinder piston rod dirt cleaning structure is sleeved on the oil cylinder piston rod and moves relative to the oil cylinder piston rod; comprises a guide sleeve (1), an elastic limiting component (2) embedded at the opening part of the guide sleeve (1) and a cleaning ring (3) clamped by the elastic limiting component (2),
the elastic limiting assembly (2) comprises:
the elastic block is fixedly arranged at the opening part of one side of the guide sleeve (1) which is away from the cylinder body of the oil cylinder,
a clamping gap (201) which is obliquely arranged on the elastic block, the oblique direction points to the piston rod,
the cleaning ring (3) is arranged in the clamping gap (201), the cleaning ring (3) comprises at least two mutually attached ring bodies, the adjacent two ring bodies can be opened and closed,
the elastic blocks are at least two, and are respectively pressed on two sides of the cleaning ring (3); an elastic gap (5) is reserved between the elastic block positioned on one side of the cleaning ring (3) facing the piston rod and the cleaning ring (3),
the bullet piece includes:
a first block (202) on the side of the cleaning ring (3) facing away from the piston rod,
a second block (203) located on the side of the cleaning ring (3) facing the piston rod,
the axial length of the first block body (202) is larger than that of the second block body (203), the end surfaces of the first block body (202) and the second block body (203) embedded into the guide sleeve (1) are flush,
the cleaning ring (3) comprises a first ring body (301) and a second ring body (302), the first ring body (301) and the second ring body (302) are mutually attached when in an initial state, the end parts of the first ring body (301) and the second ring body (302) fall on the piston rod,
a dustproof ring (4) is connected between the guide sleeve (1) and the piston rod, the dustproof ring (4) is lined below the elastic block,
the method for cleaning the marine oil cylinder piston rod dirt cleaning structure comprises the following steps:
conventional purge phase:
when the piston rod is retracted into the cylinder body, the end part of the cleaning ring (3) falls on the outer wall of the piston rod, and relative movement occurs between the cleaning ring and the piston rod, and marine organisms attached to the piston rod are scraped off by the cleaning ring (3);
high resistance removal stage:
when the connection strength between the marine organism and the piston rod is high, the cleaning ring (3) is abutted against the marine organism in the retraction process of the piston rod, the cleaning ring (3) receives the reaction force from the marine organism, the reaction force is transmitted to the first block (202) and the second block (203), the first block (202) and the second block (203) deform, the first ring body (301) and the second ring body (302) are stressed and distracted, and the marine organism is scraped by the first ring body (301) and the second ring body (302) on the premise that the piston rod continuously applies force;
friction compensation phase:
when the thickness of the dustproof ring (4) is thinned in the friction process, the elastic deformation of the elastic block compensates the abrasion thickness of the dustproof ring (4) and keeps the state that the cleaning ring (3) falls on the piston rod.
2. The decontamination method using the marine cylinder piston rod decontamination structure according to claim 1, wherein: the elastic gap (5) is: the cleaning ring (3) is inclined, and the side wall of the spring block and the wall surface of the piston rod enclose an area.
3. The decontamination method using the marine cylinder piston rod decontamination structure according to claim 1, wherein: the opening of the guide sleeve (1) is concavely formed into an installation area, the first block (202) and the second block (203) are embedded into the installation area, and the opening of the guide sleeve (1) is folded towards the first block (202) to form a flanging (101) pressed on the first block (202).
4. The decontamination method using the marine cylinder piston rod decontamination structure according to claim 1, wherein: the ends of the first ring body (301) and the second ring body (302) are wedge-shaped, and the inclined planes face to one side deviating from the piston rod.
5. The decontamination method using the marine cylinder piston rod decontamination structure according to claim 4, wherein: the wedge-shaped surfaces of the first ring body (301) and the second ring body (302) are arranged at an included angle with the piston rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211178448.3A CN115573969B (en) | 2022-09-26 | 2022-09-26 | Marine oil cylinder piston rod dirt cleaning structure and dirt cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211178448.3A CN115573969B (en) | 2022-09-26 | 2022-09-26 | Marine oil cylinder piston rod dirt cleaning structure and dirt cleaning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115573969A CN115573969A (en) | 2023-01-06 |
| CN115573969B true CN115573969B (en) | 2023-06-06 |
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ID=84583455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211178448.3A Active CN115573969B (en) | 2022-09-26 | 2022-09-26 | Marine oil cylinder piston rod dirt cleaning structure and dirt cleaning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115573969B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8510866U1 (en) * | 1985-04-13 | 1985-06-13 | Festo KG, 7300 Esslingen | Pneumatic piston-cylinder arrangement |
| CN2577003Y (en) * | 2002-09-29 | 2003-10-01 | 山东华鲁恒升化工股份有限公司 | Scraper ring assembly |
| AT508782B1 (en) * | 2010-02-15 | 2011-04-15 | Hoerbiger Kompressortech Hold | CIRCUIT ARRANGEMENT AND COMPRESSOR WITH SUCH A CUT-OFF ARRANGEMENT |
| DE102019112614B3 (en) * | 2019-05-14 | 2020-06-25 | Federal-Mogul Burscheid Gmbh | Oil scraper ring with rails arranged on one side |
| CN112855653B (en) * | 2021-01-06 | 2023-01-31 | 安徽鼎图液压设备有限公司 | Sealed double-acting single-piston-rod hydraulic cylinder |
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2022
- 2022-09-26 CN CN202211178448.3A patent/CN115573969B/en active Active
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| CN115573969A (en) | 2023-01-06 |
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