CN213064441U - Hydraulic buffer - Google Patents
Hydraulic buffer Download PDFInfo
- Publication number
- CN213064441U CN213064441U CN202021156170.6U CN202021156170U CN213064441U CN 213064441 U CN213064441 U CN 213064441U CN 202021156170 U CN202021156170 U CN 202021156170U CN 213064441 U CN213064441 U CN 213064441U
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- Prior art keywords
- piston rod
- piston
- pressure cylinder
- movable groove
- surface wall
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- 238000007789 sealing Methods 0.000 claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 6
- 239000006096 absorbing agent Substances 0.000 description 6
- 230000003139 buffering effect Effects 0.000 description 6
- 230000035939 shock Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a hydraulic buffer, belonging to the field of elevator accessories, comprising a pressure cylinder, a piston rod, a piston, a seal ring throttling mechanism and a buffer spring; one end of the pressure cylinder is provided with an opening, the piston is slidably arranged in the pressure cylinder, a cavity is arranged in the piston rod, one end of the piston rod is inserted into the pressure cylinder along the opening and is fixedly connected with the piston, and one end of the piston rod, which is close to the piston, is provided with a through hole for liquid to flow in and out; the sealing ring is fixedly arranged on the inner surface wall of one end of the pressure cylinder with an opening and is used for sealing the piston rod with the pressure cylinder; the throttling mechanism is positioned on the piston and used for controlling the fluid in the pressure cylinder to flow up and down; the buffer spring is sleeved on the pressure cylinder and the piston rod, and two ends of the buffer spring are respectively fixedly connected with the pressure cylinder and the piston rod; the center of the piston is provided with a movable groove, and the throttling mechanism is positioned in the movable groove. The hydraulic buffer is easy to process and produce, convenient to install and safe to use.
Description
Technical Field
The utility model belongs to the technical field of the elevator accessory, concretely relates to hydraulic buffer.
Background
The hydraulic buffer is used for buffering and decelerating objects acting on the hydraulic buffer to stop by means of hydraulic damping, so that a certain degree of protection effect is achieved; the safety buffer device is suitable for mechanical equipment such as hoisting transportation, elevators, metallurgy, harbor machinery, railway vehicles and the like, and is used for preventing hard collision in the working process.
As shown in fig. 1, the conventional hydraulic shock absorber includes a pressure cylinder 1 'having an opening at an end thereof, a piston 3' slidably mounted inside the pressure cylinder 1 ', a piston rod 2' inserted into the pressure cylinder 1 'through the opening and connected to the piston 3', a seal ring 4 fixedly mounted on an inner wall of the opening end of the pressure cylinder 1 'for sealing the piston rod 2' with the pressure cylinder 1 ', a cover 5 fixedly mounted on the piston rod, a cushion pad 9' bonded to the cover 5 ', and a cushion spring' fitted over the piston rod 2 'and the pressure cylinder 1'; an overflow hole 7 'is formed in the piston 3', and a throttle rod 6 'is fixedly arranged at the center of the interior of the pressure cylinder 1'; the throttle rod 6 'and the overflow hole 7' are both in a circular truncated cone shape, and the piston rod 2 'can move downwards through the overflow hole 7';
when the buffer is pressed down by force to buffer, the piston rod 2 'moves downwards to push the piston 3' to move downwards, liquid on the lower layer of the piston 2 'is extruded, the liquid overflows upwards through a gap between the overflow hole 7' and the throttle rod 6 'to enter the interior of the piston rod 2', and flows to the upper layer of the piston 3 'through the through hole 10', so that the buffer stop purpose is achieved, and the safety of the elevator is ensured.
However, although the traditional hydraulic buffer can achieve the purpose of buffering, the traditional hydraulic buffer has higher installation precision on the throttle lever, is inconvenient to produce and process, and increases the manufacturing cost of the hydraulic buffer; meanwhile, when the specification of the hydraulic buffer is large and the length of the throttle lever is long, the throttle lever is deformed and damaged in the using process.
Therefore, the hydraulic buffer which is convenient to produce and process and safe to use is provided to make up for the defects of the traditional hydraulic buffer.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a hydraulic buffer convenient to production and processing, safe in utilization to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a hydraulic buffer comprises a pressure cylinder, a piston rod, a piston, a seal ring throttling mechanism and a buffer spring; one end of the pressure cylinder is provided with an opening, the piston is slidably mounted in the pressure cylinder, a cavity is formed in the piston rod, one end of the piston rod is inserted into the pressure cylinder along the opening and is fixedly connected with the piston, and one end of the piston rod, which is close to the piston, is provided with a through hole for liquid to flow in and out; the seal ring is fixedly arranged on the inner surface wall of one end, provided with an opening, of the pressure cylinder and used for sealing the piston rod with the pressure cylinder; the throttling mechanism is positioned on the piston and used for controlling the fluid in the pressure cylinder to flow up and down; the buffer spring is sleeved on the pressure cylinder and the piston rod, and two ends of the buffer spring are respectively fixedly connected with the pressure cylinder and the piston rod; a movable groove is formed in the center of the piston, and the throttling mechanism is located in the movable groove;
the throttling mechanism comprises a valve core movably arranged in the movable groove, a supporting disc is arranged on the outer surface wall of the valve core, and the diameter of one end, close to the piston rod, of the movable groove is at least smaller than that of one end, far away from the piston rod, of the movable groove; a first limiting ring used for limiting the supporting plate to move downwards is fixedly arranged on the inner surface wall of one end, far away from the piston rod, of the movable groove;
a bolt is fixedly installed at one end, close to the piston rod, of the valve core, a pressure plate used for pressing the valve core is arranged at one end, close to the piston rod, of the movable groove, and the pressure plate is connected with the bolt in a sliding mode;
an elastic body is arranged between the pressure plate and the bolt, and two ends of the elastic body are respectively contacted with a nut of the bolt and the pressure plate;
the outer side of the valve core corresponding to the bolt is provided with an outflow hole for liquid to flow into the piston rod; and a backflow hole for liquid backflow is formed in the outer side of the supporting plate corresponding to the valve core.
Preferably, the outflow hole and the return hole are both provided with a plurality of holes, and the outflow holes and the return holes are distributed on the valve core and the support plate respectively in an annular array.
Preferably, the piston rod is in a cylindrical shape with openings at two ends, and a sealing cover for sealing the piston rod is fixedly installed at one end of the piston rod far away from the piston.
Preferably, a buffer pad is connected and fixed to one end, far away from the piston rod, of the sealing cover.
Preferably, a second limiting ring for limiting the upward movement of the piston is fixedly mounted on the inner surface wall of the pressure cylinder at a position corresponding to the upper part of the piston.
Preferably, the outer wall of the piston is sleeved with a first sealing ring for sealing the piston and the pressure cylinder.
Preferably, the inner surface wall of the opening end of the pressure cylinder is fixedly provided with a third limiting ring for limiting the seal ring.
Preferably, the inner surface wall and the outer surface wall of the seal ring are both provided with a second seal ring.
Preferably, the inner surface wall of the seal ring is fixedly provided with a dustproof ring above the second seal ring.
The hydraulic buffer adopts the valve core, the bolt, the pressure plate, the elastic piece and the movable groove to replace the design of a throttling rod and an overflow hole of the traditional hydraulic buffer, is easy to process, produce and convenient to install, and is safe to use.
Drawings
FIG. 1 is a schematic cross-sectional view of a conventional hydraulic shock absorber;
FIG. 2 is a schematic sectional view of the present invention;
FIG. 3 is a schematic structural view of the buffer status under pressure of the present invention;
fig. 4 is a schematic structural view of the oil return releasing state of the present invention;
FIG. 5 is an enlarged schematic view of the structure at A in FIG. 2;
fig. 6 is a schematic top view of the valve core of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. The condition in the embodiment can be further adjusted according to concrete condition the utility model discloses a it is right under the design prerequisite the utility model discloses a simple improvement of method all belongs to the utility model discloses the scope of claiming.
As shown in fig. 2 to 6, the present invention provides a hydraulic buffer, which comprises a pressure cylinder 1, a piston rod 2, a piston 3, a seal ring 4 throttling mechanism and a buffer spring 8; one end of the pressure cylinder 1 is provided with an opening, the piston 3 is slidably arranged in the pressure cylinder 1, a cavity is arranged in the piston rod 2, one end of the piston rod 2 is inserted into the pressure cylinder 1 along the opening and is fixedly connected with the piston 3, and one end of the piston rod 2 close to the piston 3 is provided with a through hole 10 for liquid to flow in and out; the seal ring 4 is fixedly arranged on the inner surface wall of one end of the pressure cylinder 1 with an opening and is used for sealing the piston rod 2 and the pressure cylinder 1; the throttling mechanism is positioned on the piston 3 and used for controlling the fluid in the pressure cylinder 1 to flow up and down; buffer spring 8 suit is on pressure cylinder 1 and piston rod 2, and buffer spring 8's both ends respectively with pressure cylinder 1 and piston rod 2 fixed connection.
In order to solve the problems of inconvenient installation and safety risk of the throttle lever in the traditional hydraulic buffer, the utility model is provided with a movable groove 7 at the central position of the piston 3, and a throttle mechanism is arranged in the movable groove 7; the throttling mechanism comprises a valve core 6 movably arranged in a movable groove 7, a supporting disc 12 is arranged on the outer surface wall of the valve core 6, and the diameter of one end, close to the piston rod 2, of the movable groove 7 is at least smaller than that of one end, far away from the piston rod 2, of the movable groove 7; a first limiting ring 11 used for limiting the support disc 12 to move downwards is fixedly arranged on the inner surface wall of one end, far away from the piston rod 2, of the movable groove 7;
a bolt 13 is fixedly installed at one end, close to the piston rod 2, of the valve core 6, a pressure plate 14 used for pressing the valve core 6 is arranged at one end, close to the piston rod 2, of the movable groove 7, and the pressure plate 14 is connected with the bolt 13 in a sliding mode;
an elastic body 15 is arranged between the pressure plate 14 and the bolt 13, and two ends of the elastic body 15 are respectively contacted with the nut of the bolt 13 and the pressure plate 14;
the outer side of the valve core 6 corresponding to the bolt 13 is provided with an outflow hole 16 for liquid to flow into the piston rod 2; the support plate 12 is provided with a return hole 17 corresponding to the outer side of the valve core 6 for liquid return.
As shown in fig. 2 and fig. 3, during stress buffering, the buffer spring 8 is compressed by a force, the piston rod 2 moves into the pressure cylinder 1, the piston 3 is pushed to move towards the bottom of the pressure cylinder 1, so that liquid in the space below the piston 3 is pressurized by the force, the pressure in the space below the piston 3 in the pressure cylinder 1 is increased, under the liquid pressure, the valve core 6 moves upwards, the support plate 12 is driven to move upwards to seal the return hole 17, meanwhile, under the liquid pressure, the liquid presses the pressure plate 14, the pressure plate 14 overcomes the elastic force of the elastic piece 13 to move upwards, so that the liquid enters the piston rod 2 through the outflow hole 16 and then enters the space above the pressure cylinder 1 corresponding to the piston 3 through the perforation 10, and therefore, the piston rod 2 overcomes the gravity to perform slow descent stopping, and the purpose of stopping buffering is achieved.
As shown in fig. 2 and 4, when the buffering is stopped, the impact force is released, under the action of the elastic force of the buffer spring 8, the piston rod 2 is driven to extend out of the pressure cylinder 1, the piston rod 2 drives the piston 3 to be far away from the bottom of the pressure cylinder 1, so that the pressure in the lower space of the pressure cylinder 1 is reduced, the pressure plate 14 is restored under the action of the elastic force of the elastic piece 15, the outflow hole 16 is blocked, and simultaneously the valve core 6 is driven to move downwards, so that the backflow hole 17 is opened, the liquid in the upper space of the piston 3 enters the piston rod 2 through the perforation 10, flows onto the supporting plate 12 through the gap between the valve core 6 and the movable groove 7, and enters the lower space of the.
Here, the elastic member 15 may be a spring, and its elastic limit and elastic coefficient may be selected as needed.
As shown in fig. 6, in order to ensure smooth liquid overflow, a plurality of outflow holes 16 and return holes 17 are provided, and the plurality of outflow holes 16 and the plurality of return holes 17 are respectively distributed on the valve core 6 and the support plate 12 in an annular array.
As shown in fig. 2, in order to ensure the sealing performance of the hydraulic shock absorber structure, the piston rod 2 is a cylinder with openings at both ends, and a sealing cap 5 for sealing the piston rod 2 is fixedly mounted at one end of the piston rod 2 away from the piston 3.
Furthermore, the end opening of the piston rod 2 is sealed by the sealing cover 5, so that pressure interaction is formed between the pressure in the piston rod 2 and the pressure in the upper space of the piston 3 in the pressure cylinder 1, pressure balance is kept, pressure loss is avoided, and the operation stability of the hydraulic buffer is ensured.
As shown in fig. 2, a cushion pad 9 is connected and fixed to an end of the cap 5 remote from the piston rod 2 in order to improve the safety of the hydraulic shock absorber in use.
Further, when the object moves fast, the rigid contact with the sealing cover 5 may cause the damage of the sealing cover 5 and the piston rod 2 due to the overlarge impact force, and by arranging the buffer pad 9, when the object contacts with the buffer pad 9, the impact force caused by the fast movement of the object is buffered under the elastic action of the buffer pad 9, so that the damage of the hydraulic buffer caused by the rigid contact of the object and the hydraulic buffer is effectively avoided.
As shown in fig. 2, 3 and 4, in order to improve the structural stability of the hydraulic shock absorber, a second stopper ring 18 for restricting the upward movement of the piston 3 is fixedly installed on the inner surface wall of the cylinder 1 at a position above the piston 3.
Further, the second limit ring 18 is provided at a position on the inner surface wall of the pressure cylinder 1 corresponding to the position above the piston 3 and below the seal ring 4, so that the piston 3 is limited by the second limit ring 18, and the buffer spring 8 is further limited.
As shown in fig. 2, 3 and 4, in order to ensure the sealing performance between the piston 3 and the pressure cylinder 1, the outer wall of the piston 3 is fitted with a first sealing ring 19 for sealing the piston 3 and the pressure cylinder 1.
Furthermore, the first sealing ring 19 is arranged on the outer wall of the piston 3, the outer wall of the first sealing ring 19 is tightly attached to the inner wall of the pressure cylinder 1, and the gap between the piston 3 and the pressure cylinder 1 is sealed, so that the liquid in the lower space and the liquid in the upper space of the piston 3 are prevented from flowing alternately, and the stability of the structure of the hydraulic buffer is ensured.
As shown in fig. 2 and 5, a third stopper ring 20 for restricting the seal ring 4 is fixedly mounted on the inner surface wall of the open end of the cylinder 1 in order to effectively restrict the seal ring 4.
As shown in fig. 2 and 5, in order to ensure the sealing performance between the seal ring 4 and the pressure cylinder 1 and the piston rod 2, both the inner and outer surface walls of the seal ring 4 are provided with second seal rings 21.
Further, the second sealing rings 21 are respectively arranged on the inner surface wall and the outer surface wall of the sealing ring 4, and the sealing ring 4 is sealed with the gap between the pressure cylinder 1 and the piston rod 2, so that the sealing performance between the sealing ring 4 and the pressure cylinder 1 and the piston rod 2 is ensured.
As shown in fig. 2 and 5, a dust-proof ring 22 is fixedly attached to the inner surface wall of the seal ring 4 above the second seal ring 21 in order to improve the safety of the hydraulic shock absorber in use.
Furthermore, a dustproof ring 22 is arranged on the inner surface wall of the seal ring 4 corresponding to the upper part of the second seal ring 21, so that external dust is prevented from entering a gap between the seal ring 4 and the piston rod 2 through the gap between the seal ring 4 and the piston rod 2 to influence the movement of the piston rod 2; and between the seal ring 4 and the pressure cylinder 1, a third limit ring 20 can be used as a dustproof structure, so that dust is effectively prevented from passing through a gap between the seal ring 4 and the pressure cylinder 1.
Here, the first seal ring 19 and the second seal ring 21 are both made of an elastic sealing material such as rubber or silicone, and can be closely attached to the contact surface by the elastic force thereof, thereby achieving a sealing function.
The hydraulic buffer adopts the valve core 6, the movable groove 7, the bolt 13, the pressure plate 14, the elastic piece 15, the outflow hole 16 and the backflow hole 17 to replace the traditional throttling rod and overflow hole for pressure conversion, achieves the purpose of buffering and decelerating, and is simple in production and processing, convenient and safe to use.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A hydraulic buffer comprises a pressure cylinder (1), a piston rod (2), a piston (3), a seal ring (4), a throttling mechanism and a buffer spring (8); one end of the pressure cylinder (1) is provided with an opening, the piston (3) is slidably mounted in the pressure cylinder (1), a cavity is formed in the piston rod (2), one end of the piston rod (2) is inserted into the pressure cylinder (1) along the opening and is fixedly connected with the piston (3), and one end, close to the piston (3), of the piston rod (2) is provided with a through hole (10) for liquid to flow in and out; the seal ring (4) is fixedly arranged on the inner surface wall of one end, provided with an opening, of the pressure cylinder (1) and used for sealing the piston rod (2) with the pressure cylinder (1); the throttling mechanism is positioned on the piston (3) and is used for controlling the fluid in the pressure cylinder (1) to flow up and down; the buffer spring (8) is sleeved on the pressure cylinder (1) and the piston rod (2), and two ends of the buffer spring (8) are respectively fixedly connected with the pressure cylinder (1) and the piston rod (2); the method is characterized in that: a movable groove (7) is formed in the center of the piston (3), and the throttling mechanism is located in the movable groove (7);
the throttling mechanism comprises a valve core (6) movably arranged in the movable groove (7), a supporting disc (12) is arranged on the outer surface wall of the valve core (6), and the diameter of one end, close to the piston rod (2), of the movable groove (7) is at least smaller than that of one end, far away from the piston rod (2), of the movable groove (7); a first limiting ring (11) used for limiting the support plate (12) to move downwards is fixedly mounted on the inner surface wall of one end, away from the piston rod (2), of the movable groove (7);
a bolt (13) is fixedly installed at one end, close to the piston rod (2), of the valve core (6), a pressure plate (14) used for pressing the valve core (6) is arranged at one end, close to the piston rod (2), of the movable groove (7), and the pressure plate (14) is connected with the bolt (13) in a sliding mode;
an elastic body (15) is arranged between the pressure plate (14) and the bolt (13), and two ends of the elastic body (15) are respectively contacted with a nut of the bolt (13) and the pressure plate (14);
an outflow hole (16) for liquid to flow into the piston rod (2) is formed in the outer side of the valve core (6) corresponding to the bolt (13); and a backflow hole (17) for liquid backflow is formed in the outer side of the supporting plate (12) corresponding to the valve core (6).
2. A hydraulic damper according to claim 1, wherein: the outflow hole (16) and the backflow hole (17) are both provided with a plurality of holes, and the outflow hole (16) and the backflow hole (17) are distributed on the valve core (6) and the support plate (12) in an annular array respectively.
3. A hydraulic damper according to claim 1, wherein: the piston rod (2) is in a cylindrical shape with openings at two ends, and one end of the piston rod (2) far away from the piston (3) is fixedly provided with a sealing cover (5) for sealing the piston rod (2).
4. A hydraulic damper according to claim 3, wherein: and a buffer pad (9) is fixedly connected to one end, far away from the piston rod (2), of the sealing cover (5).
5. A hydraulic damper according to claim 1, wherein: and a second limiting ring (18) for limiting the upward movement of the piston (3) is fixedly arranged at the position, corresponding to the upper part of the piston (3), of the inner surface wall of the pressure cylinder (1).
6. The hydraulic damper according to claim 5, wherein: the outer wall of the piston (3) is sleeved with a first sealing ring (19) used for sealing the piston (3) and the pressure cylinder (1).
7. A hydraulic damper according to claim 1, wherein: and a third limiting ring (20) for limiting the seal ring (4) is fixedly arranged on the inner surface wall of the opening end of the pressure cylinder (1).
8. The hydraulic damper as recited in claim 7, wherein: and the inner surface wall and the outer surface wall of the seal ring (4) are both provided with second seal rings (21).
9. A hydraulic damper according to claim 8, wherein: and a dustproof ring (22) is fixedly arranged above the inner surface wall of the seal ring (4) corresponding to the second seal ring (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021156170.6U CN213064441U (en) | 2020-06-22 | 2020-06-22 | Hydraulic buffer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021156170.6U CN213064441U (en) | 2020-06-22 | 2020-06-22 | Hydraulic buffer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213064441U true CN213064441U (en) | 2021-04-27 |
Family
ID=75567689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021156170.6U Withdrawn - After Issue CN213064441U (en) | 2020-06-22 | 2020-06-22 | Hydraulic buffer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213064441U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594565A (en) * | 2020-06-22 | 2020-08-28 | 乐天电梯部件(浙江)有限公司 | Hydraulic buffer |
-
2020
- 2020-06-22 CN CN202021156170.6U patent/CN213064441U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594565A (en) * | 2020-06-22 | 2020-08-28 | 乐天电梯部件(浙江)有限公司 | Hydraulic buffer |
| CN111594565B (en) * | 2020-06-22 | 2024-03-26 | 上海乐天电梯部件有限公司 | Hydraulic buffer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230407 Address after: Building 21, No. 19 Haiwan Avenue, Xitangqiao Street, Haiyan County, Jiaxing City, Zhejiang Province, 314000 Patentee after: Lotte elevator parts (Zhejiang) Co.,Ltd. Address before: Building 8, 5333 Beiqing Road, Qingpu District, Shanghai Patentee before: SHANGHAI LIFTECH ELEVATOR ACCESSORIES Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20210427 Effective date of abandoning: 20240326 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20210427 Effective date of abandoning: 20240326 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |