CN115288316A - Ball and friction pendulum shock insulation support - Google Patents
Ball and friction pendulum shock insulation support Download PDFInfo
- Publication number
- CN115288316A CN115288316A CN202211032942.9A CN202211032942A CN115288316A CN 115288316 A CN115288316 A CN 115288316A CN 202211032942 A CN202211032942 A CN 202211032942A CN 115288316 A CN115288316 A CN 115288316A
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- ball
- sliding block
- friction
- support plate
- sliding
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- 238000009413 insulation Methods 0.000 title abstract description 17
- 230000035939 shock Effects 0.000 title abstract description 17
- 238000002955 isolation Methods 0.000 claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 229910000851 Alloy steel Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000013016 damping Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/023—Bearing, supporting or connecting constructions specially adapted for such buildings and comprising rolling elements, e.g. balls, pins
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a ball and friction pendulum seismic isolation support which comprises an upper support plate, a plurality of balls, a lower support plate and a sliding block, wherein the upper support plate is provided with a plurality of sliding blocks; the bottom of the sliding block is connected with the lower support plate in a sliding manner; the top of the sliding block is embedded in the upper support plate and can horizontally move in the upper support plate; a plurality of balls laminate each other and set up between upper bracket board and slider top, can roll between last bedplate and the slider. According to the scheme, the rolling friction coefficient is usually far smaller than the sliding friction coefficient by utilizing the characteristics of rolling and sliding friction, so that the friction coefficient of the support can be converted under the temperature and earthquake action, namely the rolling friction of the balls is utilized to release the temperature deformation of the structure under the temperature action, the sliding friction of the friction pendulum sliding block is utilized to reduce the influence of the earthquake on the structure under the earthquake action, and the reliability of the shock insulation support is greatly improved.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a ball and a friction pendulum seismic isolation support.
Background
Since the 2008 Wenchuan earthquake, the seismic isolation technology is rapidly developed in China, and seismic isolation supports are widely applied to civil engineering structures, but some problems still exist at present and need to be solved. In the construction period and the initial operation stage of a large-span concrete building or a bridge structure, the environmental temperature and the concrete shrinkage can cause larger stress in the structure, and although the stress can be released through the shock insulation support, the shock insulation support can also be caused to generate larger initial displacement which can not be recovered any more, so that the displacement capability of the support is reduced in the strong earthquake. Therefore, it is desirable to develop a vibration-isolating mount that can release temperature deformation.
The existing vibration isolation supports capable of releasing temperature deformation have the following problems in practical engineering application:
(1) The cost is high: some shock insulation supports are respectively connected with a piston rod and a piston cylinder of a viscous damper by adopting a lower support plate and a bottom plate, and then the characteristic that the damping force in the viscous damper is positively correlated with the deformation speed is utilized, namely, when the deformation speed is low (temperature deformation), the piston with small damping force can freely move, and the whole shock insulation support can slide on the bottom plate; when the deformation speed is high (earthquake deformation), the movement of the large piston with damping force is locked, the whole shock insulation support cannot slide on the bottom plate, and the support generates displacement deformation and plays a shock insulation function. However, releasing the temperature distortion by mounting a viscous damper on the mount increases the mount cost.
(2) Only one horizontal direction of temperature deformation can be released: this is not applicable to concrete structures having large longitudinal and transverse spans, and therefore temperature deformation of such structures may occur in two horizontal directions, and it is necessary to release the temperature deformation in two horizontal directions in the seismic isolation mount.
(3) No self-resetting capability: some seismic isolation bearings, although capable of releasing temperature deformation, do not have self-resetting capability after an earthquake.
The three-point vibration isolation support capable of releasing temperature deformation has the advantage that the reliability of the conventional vibration isolation support capable of releasing temperature deformation is greatly reduced due to the problems in practical engineering application.
Therefore, how to improve the reliability of the vibration isolation support is a problem to be solved in the field.
Disclosure of Invention
Aiming at the technical problem of low reliability of the existing shock insulation support, the invention aims to provide a ball and a friction pendulum shock insulation support which can convert friction coefficients under the action of temperature and earthquake, a viscous damper is not required to be arranged on the support to release temperature deformation, and the reliability of the shock insulation support is greatly improved.
In order to achieve the purpose, the invention provides a ball and friction pendulum seismic isolation support which comprises an upper support plate, a plurality of balls, a lower support plate and a sliding block, wherein the upper support plate is provided with a plurality of sliding holes; the bottom of the sliding block is connected with the lower support plate in a sliding manner; the top of the sliding block is embedded in the upper support plate and can horizontally move in the upper support plate; a plurality of balls laminate each other and set up between upper bracket board and slider top, can roll between last bedplate and the slider.
Furthermore, the middle of the lower support plate is a spherical groove, and a spherical sliding plate is attached to the surface of the groove and can be connected with the sliding block in a matched mode to serve as a sliding surface of the sliding block.
Furthermore, the periphery of the upper portion of the lower support plate is provided with a limiting plate used for limiting the sliding block.
Furthermore, the whole sliding block is cylindrical, the top of the sliding block protrudes outwards, and the cross section of the sliding block is of a T-shaped structure.
Furthermore, the bottom of the sliding block is attached with a friction pad with a low friction coefficient and is connected with the spherical sliding plate in a matching manner.
Furthermore, a rolling surface is attached to the surface of the top end of the whole sliding block.
Furthermore, the upper support plate is of a hollow cuboid structure, and the central area of the top surface of the upper support plate is a sunken cuboid ball groove; the height of the ball groove is smaller than the diameter of the ball.
Furthermore, the inner central area and the bottom central area of the upper support plate are both rectangular cavities, namely a first rectangular cavity and a second rectangular cavity; the top bulge of slider is embedded in first cuboid cavity, slider bottom cylinder part embedded in the second cuboid cavity, and the slider can carry out horizontal displacement in first cuboid cavity and second cuboid cavity.
Furthermore, first cuboid cavity and second cuboid cavity both sides are equipped with the curb plate, the curb plate can be regarded as and carried out spacing subassembly to the slider.
Further, the diameter of the lower support plate is larger than that of the upper support plate.
The ball and friction pendulum isolation bearing that this scheme provided, it is through having utilized roll and sliding friction's characteristics for the support can conversion coefficient of friction under temperature and seismic action, utilize the rolling friction of ball to release the temperature deformation of structure under the temperature effect promptly, utilize the sliding friction of friction pendulum slider to reduce the earthquake under the seismic action to the influence of structure, improved isolation bearing's reliability from this greatly.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
FIG. 1 is a cross-sectional view of the ball and friction pendulum seismic isolation bearing.
FIG. 2 is a top view of the lower support plate in the ball and friction pendulum seismic isolation bearing.
FIG. 3 is a top view of the sliding block in the ball and friction pendulum seismic isolation bearing.
FIG. 4 is a top view of the support plate in the ball and friction pendulum seismic isolation bearing.
FIG. 5 is a bottom view of the upper support plate of the ball and friction pendulum seismic isolation bearing.
The following are references describing the components in the drawings:
1. the bearing plate comprises an upper bearing plate 2, a sliding block 3, a lower bearing plate 4, balls 5, a ball groove 6, a limiting groove 7, a rolling surface 8, a limiting plate 9, a spherical sliding plate 10, a friction pad 11, a first cuboid cavity 12 and a second cuboid cavity.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Aiming at the technical problem that the existing shock insulation support is low in reliability, based on the technical problem, the invention provides the ball and the friction pendulum shock insulation support, the rolling and sliding friction characteristics are utilized, so that the friction coefficient of the support can be converted under the temperature and earthquake action, namely, the rolling friction of the ball is utilized to release the temperature deformation of the structure under the temperature action, and the sliding friction of the friction pendulum sliding block is utilized to reduce the influence of the earthquake on the structure under the earthquake action, so that the reliability of the shock insulation support is greatly improved.
Referring to fig. 1, the ball friction pendulum isolation bearing that this scheme provided, it includes upper bracket board 1, slider 2, undersetting board 3 and a plurality of ball 4.
Further, the lower support plate 3 is used for being matched and connected with the sliding block 2, and the influence of an earthquake on the structure can be reduced by utilizing the sliding friction of the friction pendulum sliding block.
Referring to fig. 2, the middle of the lower support plate 3 is a spherical groove, and a spherical sliding plate 9 is arranged on the groove surface and attached to the spherical groove, and can be connected with the sliding block 2 in a matching way to serve as a sliding surface of the sliding block 2.
The spherical sliding plate 9 is preferably used as a sliding surface, and compared with a plane sliding plate, the sliding block has better self-resetting capability after an earthquake
Meanwhile, the periphery of the upper portion of the lower support plate 3 is provided with the protruding limiting plate 8, the sliding block 2 can be limited, the sliding block 2 can be prevented from being punched out of the spherical sliding plate 9 in the sliding process, and the reliability of the sliding block 2 in working is guaranteed.
Referring to fig. 3, the slider 2 is generally cylindrical and has a top portion protruding outward, and is T-shaped when viewed from the side.
The bottom of the sliding block 2 is provided with a friction pad 10 for sliding the sliding block 2.
The friction pad 10 is made of a material with a low friction coefficient, and the friction pad 10 with a low friction coefficient can reduce the influence of an earthquake on the structure by utilizing the sliding friction of the friction pendulum sliding block.
The material with the low friction coefficient preferably adopts polytetrafluoroethylene which is the lowest friction coefficient in solid materials, and the effect of reducing the influence of an earthquake on the structure through the friction of the low-friction pad in the scheme can be met.
However, the material with a low friction coefficient in the present embodiment is not limited to polytetrafluoroethylene, and may be specifically determined according to the actual situation.
The whole top surface of slider 2 is laminated and is equipped with stainless steel rolling surface 7 for be connected with ball 4 cooperation, make ball 4 roll on rolling surface 7, release the temperature deformation of structure through ball 4's rolling friction.
Here, the overall slider 2 is preferably T-shaped, and is more stable and can slide on the spherical sliding plate 9 more stably.
Simultaneously, the top of slider 2 is outside outstanding, and the later stage of being convenient for can carry out more reliable cooperation with upper bracket board 1 and be connected.
In addition, the sliding block 2 is preferably made of high-strength alloy steel, and the high-strength alloy steel has high strength and friction resistance, so that the reliability of the sliding block 2 during sliding friction under the action of an earthquake can be improved, and the stability of the sliding block 2 is ensured; however, the high-strength alloy steel is not limited to the use, and the selection of the specific material can be determined according to actual conditions.
See 1, upper bracket board 1 is hollow cuboid structure, and its inside top surface central zone is a sunken cuboid ball groove 5, and ball groove 5 highly is less than ball 4's diameter to avoid ball groove 5 and rolling surface 7 to take place the friction, influence the effect that release structure temperature warp.
The inside central zone and the bottom central zone of upper bracket board 1 are the cuboid cavity, are first cuboid cavity 11 and second cuboid cavity 12 respectively, and 11 volumes in first cuboid cavity are greater than 12 volumes in second cuboid cavity.
The top bulge of slider 2 is embedded in first cuboid cavity 11, and 2 bottom cylinder portions of slider are embedded in second cuboid cavity 12, and the length of first cuboid cavity 11 and second cuboid cavity 12 is greater than the length of the top bulge of slider 2 and bottom cylinder respectively, consequently, slider 2 can carry out the horizontal displacement of certain stroke respectively in first cuboid cavity 11 and second cuboid cavity 12.
Simultaneously, the curb plate of first cuboid cavity 11 and second cuboid cavity 12 both sides can form spacing groove 6, and is spacing to slider 2 horizontal displacement in the cuboid cavity, separates with slider 2 when preventing that upper bracket board 1 rolls at ball 4.
Referring to fig. 4-5, the balls 4 are closely arranged and arranged vertically and horizontally to fill the whole ball groove 5, and when the balls 4 roll on the rolling surface 7 at the top of the slider 2, all the balls 4 are always kept in the ball groove 5.
The ball 4 is preferably made of high-strength alloy steel, the high-strength alloy steel has the characteristics of high temperature resistance and friction resistance, the vertical bearing capacity is strong, the reliability of the ball 4 during rolling friction can be improved, and the stability of the ball 4 is ensured; however, the high-strength alloy steel is not limited to the use, and the selection of the specific material can be determined according to actual conditions.
At the same time, the use of a plurality of balls 4 avoids the problem of stress concentration at the contact point of a single ball and the rolling surface 7.
In addition, the diameter of the lower support plate 3 is larger than that of the upper support plate 1, so that the lower support plate 3 can form a very stable base, and the stability of the whole shock insulation support is improved.
In conclusion, when earthquake load acts, the action of earthquake on the upper structure of the support is reduced mainly through the sliding 2 displacement of the sliding block, meanwhile, the sliding friction can consume earthquake energy, and the gravity of the upper structure can drive the sliding block to return to the original position on the spherical sliding plate 9 after the earthquake is finished; when temperature load acts, the rolling displacement of the ball can release the temperature deformation generated in the structure.
In addition, the rolling friction coefficient is generally far smaller than the sliding friction coefficient, so that the rolling of the ball 4 is prior to the sliding of the sliding block 2 in the invention, which effectively avoids the initial displacement of the support on the sliding surface thereof during temperature deformation, thereby limiting the displacement requirement during earthquake.
According to the ball friction pendulum seismic isolation support formed by the scheme, firstly, the rolling and sliding friction characteristics (the rolling friction coefficient is usually far smaller than the sliding friction coefficient) are utilized, so that the friction coefficient of the support can be converted under the temperature and earthquake action, namely, the rolling friction of the balls is utilized to release the temperature deformation of the structure under the temperature action, and the sliding friction of the friction pendulum sliding block is utilized to reduce the influence of the earthquake on the structure under the earthquake action.
Secondly, the invention gives full play to the characteristic that the ball can roll in any horizontal direction, so that the support can release temperature deformation in any horizontal direction without influencing the shock insulation performance.
Meanwhile, the main structure of the vibration isolation support is the friction pendulum, and the vibration isolation support has good vibration isolation performance and self-resetting capability.
In addition, the invention has simple structure, low cost, small required space, good durability and convenient manufacture, installation, maintenance and replacement.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A ball and friction pendulum seismic isolation support is characterized by comprising an upper support plate, a plurality of balls, a lower support plate and a sliding block; the bottom of the sliding block is connected with the lower support plate in a sliding manner; the top of the sliding block is embedded in the upper support plate and can horizontally move in the upper support plate; a plurality of balls are mutually attached and arranged between the upper support plate and the top of the sliding block, and can roll between the upper support plate and the sliding block.
2. The ball and friction pendulum seismic isolation bearing of claim 1, wherein the lower bearing plate is a spherical groove in the middle, and a spherical sliding plate is attached to the surface of the groove and can be in fit connection with the sliding block to serve as a sliding surface of the sliding block.
3. The ball and friction pendulum seismic isolation bearing according to claim 1, wherein a limiting plate for limiting the sliding block is arranged on the periphery of the upper portion of the lower bearing plate.
4. The ball and friction pendulum seismic isolation bearing according to claim 1, wherein said slider is generally cylindrical and has an outwardly protruding top and a T-shaped cross-section.
5. The ball and friction pendulum seismic isolation bearing of claim 2, wherein the bottom of the sliding block is attached with a friction pad with a low friction coefficient and is connected with the spherical sliding plate in a matching way.
6. The ball and friction pendulum seismic isolation bearing according to claim 1, wherein a rolling surface is attached to a top surface of the slider.
7. The ball and friction pendulum seismic isolation bearing according to claim 1, wherein said upper bearing plate is a hollow cuboid structure, and the central area of the inner top surface of said upper bearing plate is a recessed cuboid ball groove; the height of the ball groove is smaller than the diameter of the ball.
8. The ball and friction pendulum seismic isolation bearing according to claim 4, wherein the inner central region and the bottom central region of the upper bearing plate are both rectangular parallelepiped cavities, namely a first rectangular parallelepiped cavity and a second rectangular parallelepiped cavity; the top bulge of slider is embedded in first cuboid cavity, slider bottom cylinder portion is embedded in the second cuboid cavity, and the slider can carry out horizontal displacement in first cuboid cavity and second cuboid cavity.
9. The ball and friction pendulum seismic isolation bearing of claim 8, wherein side plates are disposed on two sides of the first cuboid cavity and the second cuboid cavity, and the side plates can serve as limiting components for limiting the sliding block.
10. The ball and friction pendulum seismic isolation bearing of claim 1, wherein the lower bearing plate diameter is greater than the upper bearing plate diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211032942.9A CN115288316B (en) | 2022-08-26 | 2022-08-26 | Ball and friction pendulum shock insulation support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211032942.9A CN115288316B (en) | 2022-08-26 | 2022-08-26 | Ball and friction pendulum shock insulation support |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115288316A true CN115288316A (en) | 2022-11-04 |
| CN115288316B CN115288316B (en) | 2024-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211032942.9A Active CN115288316B (en) | 2022-08-26 | 2022-08-26 | Ball and friction pendulum shock insulation support |
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| Country | Link |
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| CN (1) | CN115288316B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115928901A (en) * | 2022-12-02 | 2023-04-07 | 清华大学 | Filled type friction pendulum shock insulation support |
| JP7496960B1 (en) | 2023-06-23 | 2024-06-10 | 株式会社エムティーコーポレーション | Seismic isolation devices for single-family homes |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10219842A (en) * | 1997-01-31 | 1998-08-18 | Fujikura Ltd | Base isolation device for structure |
| TW200823387A (en) * | 2006-11-28 | 2008-06-01 | Chung-Shing Tsai | Shock isolator |
| CN102425235A (en) * | 2011-10-12 | 2012-04-25 | 北京工业大学 | Anti-pulling universal rolling supporting base |
| CN205000238U (en) * | 2015-09-13 | 2016-01-27 | 宁波大学 | Benzvalene form sliding friction - roller bearing rolling friction makes up isolation bearing |
| CN206529895U (en) * | 2017-01-19 | 2017-09-29 | 青岛理工大学 | Rolling type anti-overturning support |
| CN109898411A (en) * | 2019-04-04 | 2019-06-18 | 北京建筑大学 | A kind of spin support |
-
2022
- 2022-08-26 CN CN202211032942.9A patent/CN115288316B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10219842A (en) * | 1997-01-31 | 1998-08-18 | Fujikura Ltd | Base isolation device for structure |
| TW200823387A (en) * | 2006-11-28 | 2008-06-01 | Chung-Shing Tsai | Shock isolator |
| CN102425235A (en) * | 2011-10-12 | 2012-04-25 | 北京工业大学 | Anti-pulling universal rolling supporting base |
| CN205000238U (en) * | 2015-09-13 | 2016-01-27 | 宁波大学 | Benzvalene form sliding friction - roller bearing rolling friction makes up isolation bearing |
| CN206529895U (en) * | 2017-01-19 | 2017-09-29 | 青岛理工大学 | Rolling type anti-overturning support |
| CN109898411A (en) * | 2019-04-04 | 2019-06-18 | 北京建筑大学 | A kind of spin support |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115928901A (en) * | 2022-12-02 | 2023-04-07 | 清华大学 | Filled type friction pendulum shock insulation support |
| JP7496960B1 (en) | 2023-06-23 | 2024-06-10 | 株式会社エムティーコーポレーション | Seismic isolation devices for single-family homes |
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| Publication number | Publication date |
|---|---|
| CN115288316B (en) | 2024-06-14 |
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