CN214035965U - Vertical column floating type fan foundation and wind generating set - Google Patents

Vertical column floating type fan foundation and wind generating set Download PDF

Info

Publication number
CN214035965U
CN214035965U CN202023309196.2U CN202023309196U CN214035965U CN 214035965 U CN214035965 U CN 214035965U CN 202023309196 U CN202023309196 U CN 202023309196U CN 214035965 U CN214035965 U CN 214035965U
Authority
CN
China
Prior art keywords
foundation
sub
section
upright post
rolling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202023309196.2U
Other languages
Chinese (zh)
Inventor
周昳鸣
郭小江
闫姝
穆延非
郑枫
李华
周国栋
索中举
刁新忠
陆界屹
陈晓路
姚中原
王瑞
季笑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huaneng Yancheng Dafeng New Energy Power Generation Co ltd
Jiangsu Cleaning Energy Branch Of Huaneng Power Intl Inc
Huaneng Clean Energy Research Institute
Huaneng Offshore Wind Power Science and Technology Research Co Ltd
Original Assignee
Huaneng Yancheng Dafeng New Energy Power Generation Co ltd
Jiangsu Cleaning Energy Branch Of Huaneng Power Intl Inc
Huaneng Clean Energy Research Institute
Huaneng Offshore Wind Power Science and Technology Research Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huaneng Yancheng Dafeng New Energy Power Generation Co ltd, Jiangsu Cleaning Energy Branch Of Huaneng Power Intl Inc, Huaneng Clean Energy Research Institute, Huaneng Offshore Wind Power Science and Technology Research Co Ltd filed Critical Huaneng Yancheng Dafeng New Energy Power Generation Co ltd
Priority to CN202023309196.2U priority Critical patent/CN214035965U/en
Application granted granted Critical
Publication of CN214035965U publication Critical patent/CN214035965U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/727—Offshore wind turbines
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/728—Onshore wind turbines

Landscapes

  • Wind Motors (AREA)

Abstract

The utility model discloses a floating fan foundation of upright post and wind generating set, the floating fan foundation of upright post includes mooring system, foundation structure and sets up the anchor foundation in the seabed, mooring system fixes foundation structure on the anchor foundation in the seabed, foundation structure includes equal cross-section upright post and variable cross-section upright post, equal cross-section upright post lower extreme connects variable cross-section upright post upper end, the cross-section of variable cross-section upright post is crescent from the top down, the lower part of variable cross-section upright post sets up the anti-rolling water tank; the anti-rolling water tank is divided into a plurality of sub-tanks along the circumferential direction, and the tops and the bottoms of the sub-tanks are respectively communicated through pipelines; the upper structure of the foundation structure is smaller, and the lower structure is thicker, so that the gravity center of the whole structure is reduced, the draft depth is reduced, the whole gravity center of the structure is moved downwards, the damping coefficient is increased, the natural frequency is reduced, and the stability of a foundation platform is improved; and the draught depth is reduced, so that the application range of the foundation platform structure is expanded.

Description

Vertical column floating type fan foundation and wind generating set
Technical Field
The utility model belongs to the technical field of wind power generation floats formula foundation design, concretely relates to formula fan foundation and wind generating set are floated to upright post.
Background
With the continuous expansion of the development of wind energy resources, especially the development in deep sea, the research on the floating wind turbine is paid more attention. The common floating foundations include upright column foundations, tension leg foundations, semi-submersible foundations and the like. Coastal water depth is shallow, the water depth applicability of the platform and the manufacturing cost of a mooring structure are considered, and the vertical column fan foundation is widely concerned due to the advantages of simple structure, good stability and the like.
As shown in fig. 1, the conventional vertical column floating wind turbine is suitable for deep sea with water depth of 80m, and mainly comprises four parts, namely a wind turbine (1), a tower (2), a foundation structure (3) and a mooring system (4). However, the vertical column floating type wind turbine foundation needs to consider wind load, wave load, hydrodynamic load and mooring load at the same time, so that the requirement on stability is higher, and the required draft is larger. Because the offshore distance in China is within 100km in the sea area, the requirement of the vertical column floating type wind turbine foundation on the water depth (generally, the water depth is more than 80m) can not be met, and the offshore distance in China is not researched by extensive scholars in China. The conventional upright column floating type fan foundation has high requirement on the applicable water depth, and is not wide in the applicability in the current China coastal sea area.
In addition, for the vertical column floating type wind turbine foundation structure, since the dynamic characteristics thereof are similar to those of a ship, it can be considered to use the anti-rolling tanks to increase the stability of the foundation structure.
Disadvantages of the anti-roll tank include: only when the anti-rolling water tank reaches a certain volume, the anti-rolling water tank can generate enough rolling restoring moment, and the anti-rolling water tank can play a certain effect; in addition, the self-oscillation frequency of the anti-rolling tank must be higher than that of the floating foundation platform to realize rolling and anti-rolling, otherwise, the anti-rolling tank can even generate an effect of increasing rolling.
In summary, in order to solve the applicable water depth range of the vertical column floating type wind turbine foundation structure and increase the stability of the vertical column floating type foundation, the structure of the conventional vertical column floating type wind turbine foundation needs to be optimized.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides a vertical column floats formula fan foundation and wind generating set sets up the anti-rolling tank design, reduces the center of structure, reduces the draft to make vertical column float formula fan foundation can be applicable to the sea area that the depth of water is only greater than more than 50 m.
In order to realize the purpose, the utility model discloses a technical scheme is: the foundation structure comprises a uniform-section upright column and a variable-section upright column, the lower end of the uniform-section upright column is connected with the upper end of the variable-section upright column, the section of the variable-section upright column is gradually increased from top to bottom, and a sway reduction cabin is arranged at the lower part of the variable-section upright column; the anti-rolling water tank is divided into a plurality of sub-tanks along the circumferential direction, the tops and the bottoms of the sub-tanks are respectively communicated through pipelines, and at least one layer of anti-rolling water tank is arranged.
The anti-rolling water tank comprises an inner cylinder and an outer cylinder, an annular space is formed by the inner cylinder and the outer cylinder, a partition plate is arranged in the annular space to divide the annular space into a plurality of sub-tanks in equal parts, and the sub-tanks which are symmetrical about the longitudinal central plane of the anti-rolling water tank are communicated through pipelines.
The pipeline is provided with a sensor for monitoring flow, and the anti-rolling water tank is internally provided with a water level monitoring sensor.
The anti-rolling tank is provided with three layers, and each layer of anti-rolling tank is independent.
The number of the sub-compartments is even, the upper parts of two opposite sub-compartments in the sub-compartments are communicated through an upper communicating pipe, and the lower parts of two opposite sub-compartments in the sub-compartments are communicated through a lower communicating pipe.
The anti-rolling tank is provided with at least four sub-tanks.
The foundation structure is formed by welding and splicing steel cylinder segments along the axial direction, and the steel cylinder segments are rolled by steel plates.
The connection part of the upright post with the uniform cross section and the upright post with the variable cross section is in smooth transition.
The surfaces of the mooring system and the foundation structure are provided with corrosion resistant coatings.
A vertical column floating type wind generating set comprises a fan, a tower frame and a foundation, wherein the fan is arranged at the top end of the tower frame, the tower frame is arranged on the foundation, and the foundation adopts the vertical column floating type fan foundation of the utility model; the top end face of the foundation structure is not smaller than the diameter of the bottom end face of the tower.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
the upper structure of the foundation structure is smaller, and the lower structure is thicker, so that the gravity center of the whole structure is reduced, the draft depth is reduced, the whole gravity center of the structure is moved downwards, the damping coefficient is increased, the natural frequency is reduced, and the stability of a foundation platform is improved; the foundation platform structure has good anti-rolling effect in the harmonic frequency range, and reduces the draught depth, thereby expanding the application range of the foundation platform structure.
Drawings
The above and other features and advantages of the present invention will become more apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic view of a conventional upright column floating fan system.
Fig. 2 is a schematic view of an implementable upright floating fan system.
Fig. 3 is a schematic diagram of a foundation structure of a floating type fan vertical column using a rolling reduction tank.
Fig. 4 is a schematic view of a practical anti-rolling tank structure.
Fig. 5 is a schematic front view of a practical anti-rolling tank of the present invention.
In the attached drawings, 1-a fan, 2-a tower, 3-a foundation structure, 4-a mooring system, 5-a rolling reduction water tank, 6-a communication pipe, 31-an equal-section upright column, 32-a variable-section upright column, 61-a first upper communication pipe, 62-a second upper communication pipe, 63-a first lower communication pipe and 64-a second lower communication pipe.
Detailed Description
The invention will be described in detail with reference to the drawings, in which exemplary embodiments of the invention are shown.
The utility model provides a floating fan foundation structure of upright post, including mooring system 4, foundation structure 3 and the anchor basis of setting in the seabed, mooring system 4 fixes foundation structure 3 on the anchor basis of seabed, and foundation structure 3 includes uniform section upright post 31 and variable cross section upright post 32, and the variable cross section upright post 32 upper end is connected to uniform section upright post 31 lower extreme, and the cross-section of variable cross section upright post 32 is from the top down crescent, and the lower part of variable cross section upright post 32 sets up the stabilization water tank 5; the anti-rolling tank 5 is divided into a plurality of sub-tanks along the circumferential direction, and the tops and the bottoms of the sub-tanks are respectively communicated through pipelines.
The anti-rolling tank 5 comprises an inner cylinder and an outer cylinder, an annular space is formed by the inner cylinder and the outer cylinder, a partition plate is arranged in the annular space to divide the annular space into a plurality of sub-tanks, and the sub-tanks which are symmetrical about the longitudinal central plane of the anti-rolling tank 5 are communicated through pipelines.
The anti-rolling tank 5 is provided with at least one layer, and when the anti-rolling tank 5 is provided with a plurality of layers, the anti-rolling tanks 5 on each layer are mutually independent.
The anti-rolling tank 5 is provided with three layers.
The number of the sub-compartments is even, the upper parts of two opposite sub-compartments in the sub-compartments are communicated through an upper communicating pipe, and the lower parts of two opposite sub-compartments in the sub-compartments are communicated through a lower communicating pipe.
The anti-rolling tank 5 is provided with at least four sub-tanks.
The foundation structure 3 is formed by welding and splicing steel cylinder segments along the axial direction, and the steel cylinder segments are rolled by steel plates.
The junction of the uniform-section upright post 31 and the variable-section upright post 32 is in smooth transition.
The surfaces of the mooring system 4 and the foundation structure 3 are provided with a corrosion resistant coating.
As an embodiment of the present invention, an upright column floating wind turbine generator system includes a fan 1, a tower 2 and a foundation, wherein the fan 1 is disposed on the top of the tower 2, the tower 2 is disposed on the foundation, and the foundation adopts the upright column floating wind turbine foundation of the present invention; the top end face of the foundation structure 3 is not smaller than the diameter of the bottom end face of the tower 2.
The utility model provides an adopt floating formula fan foundation of upright post in U type anti-rolling tank, float formula foundation structure with upright post and be used for the depth of water in the sea area that is only greater than 50m, as shown in fig. 2, have such characteristic, include: a wind turbine 1 and a tower 2 are arranged in a deep sea area, and a foundation structure 3 is fixed on a pile foundation on the sea bottom through a mooring system 4. The utility model discloses divide into two parts with the upright post structure of traditional uniform cross section, equal cross section upright post 31 and variable cross section upright post 32.
Referring to fig. 2, the utility model provides an adopt upright post of U type anti-rolling tank to float foundation structure 3 of formula fan basis, equal cross-section upright post 31's upper cross-section AA' and lower cross-section BB 'all equal, and variable cross-section upright post 32's upper cross-section BB 'equals with equal cross-section upright post 31's lower cross-section, and lower cross-section CC 'will obviously be greater than upper cross-section BB', wholly is the loudspeaker form that the opening is decurrent.
With reference to fig. 3, the bottom of the foundation structure 3 is provided with several partsAnti-rolling water tank 5 in cabin, set up the inner tube in anti-rolling water tank 5, form annular space between inner tube and the outer tube, set up the baffle in the annular space with its equant divide into the quartering, link to each other through communicating pipe 6 between the subdivision, it is concrete, wherein relative subdivision upper portion is respectively through communicating pipe 61 and second on communicating pipe 62, the subdivision upper portion of 5 vertical central planes of anti-rolling water tank symmetry is respectively through communicating pipe 63 and second under communicating pipe 64 intercommunication, it can both be effective to realize anti-rolling water tank when not equidirectional rocking. The heights of the first upper communication pipe 61, the second upper communication pipe 62, the first lower communication pipe 63, and the second lower communication pipe 64 are h, respectively1,h2,h3,h4After the geometric dimension of the anti-rolling water tank is determined, the anti-rolling effect mainly depends on the arrangement of the vertical position, the selection of parameters such as the side tank liquid level height and the damping coefficient; h is1,h2,h3,h4And the water surface height is designed according to site environmental conditions, fan model size, basic platform size, ballast weight and basic platform stability index requirements of specific projects.
The utility model provides an adopt floating formula fan basis of upright post in U type anti-rolling tank, foundation structure 3's superstructure is more tiny, and the substructure is coarser for reduce overall structure focus, reduce the draft. The floating type fan foundation structure is not limited to a horn shape with a downward opening, but also comprises other structural forms of small top and big bottom; the anti-rolling tank is not limited to the structure form that the upper communicating pipe and the lower communicating pipe are connected, but also comprises the structure form that the upper communicating pipe and the lower communicating pipe are connected through a tank type.
Through the vertical column floating type fan foundation adopting the U-shaped anti-rolling water tank, the center of gravity of the whole structure can be moved downwards, the damping coefficient is increased, the natural frequency is reduced, and the stability of a foundation platform is increased; and the draught depth is reduced, so that the application range of the foundation platform structure is expanded.
Fig. 2 is the utility model provides a novel upright post floats formula fan system, including fan 1 and pylon 2, fan 1 sets up on the top of pylon 2, and pylon 2 sets up on foundation structure 3 to fix foundation structure 3 on the pile foundation in the seabed through mooring system 4.
Fig. 3 is a vertical column floating type fan foundation adopting a U-shaped anti-rolling tank, which divides a conventional equal-section vertical column structure into two parts, wherein an equal-section vertical column 31 and a variable-section vertical column 32 are provided, an upper section AA ' and a lower section BB ' of the equal-section vertical column 31 are equal, an upper section BB ' of the variable-section vertical column 32 is equal to a lower section of the equal-section vertical column 31, and the lower section CC ' is significantly larger than the upper section BB ', and the whole is in a horn shape with a downward opening.
Fig. 4 and 5 show a structure view and a front view of a U-shaped anti-roll tank, respectively, and the size of the foundation structure 3 is as follows: OO ═ 50m, OO '═ 20m, O' O ═ D ═ 30m, D ═ 6m, BC and B 'C' are connected through straight line, AB is connected with BC, A 'B' is connected with B 'C' and chamfered, chamfer radius is 5m, AA '═ BB ═ 7m, CC' ═ 50m, height h ═ 4m of the tank, 3 layers of tanks are set, h is set1＝2.5m，h2＝2.4m，h3＝0.5m，h4＝0.4m。
The foundation structure 3 is rolled into a cylinder by a steel plate with the height of 2.0m-3.0m, and is connected into a vertical column floating foundation by girth welding.
The upper section AA ' of foundation structure 3 is the same or slightly larger diameter than the bottom of tower 2, and the lower section CC ' of foundation structure 3 has a significantly larger diameter than the upper sections AA ', A, B and C, with increasing diameters.
The foundation structure 3 is connected to the seabed anchoring foundation by means of a mooring structure 4, preventing its movement.
The above embodiments and parameters are selected as preferred examples of the present invention, and are not intended to limit the scope of the present invention.

Claims (10)

1. The vertical column floating type fan foundation is characterized by comprising a mooring system (4), a foundation structure (3) and an anchoring foundation arranged on the sea bottom, wherein the mooring system (4) fixes the foundation structure (3) on the anchoring foundation on the sea bottom, the foundation structure (3) comprises a uniform-section vertical column (31) and a variable-section vertical column (32), the lower end of the uniform-section vertical column (31) is connected with the upper end of the variable-section vertical column (32), the section of the variable-section vertical column (32) is gradually increased from top to bottom, and a sway reduction cabin (5) is arranged at the lower part of the variable-section vertical column (32); the anti-rolling water tank (5) is divided into a plurality of sub-tanks along the circumferential direction, and the tops and the bottoms of the sub-tanks are respectively communicated through pipelines; the anti-rolling tank (5) is provided with at least one layer.
2. The vertical column floating type fan foundation according to claim 1, wherein the anti-rolling tank (5) comprises an inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder form an annular space, a partition plate is arranged in the annular space to divide the annular space into a plurality of sub-tanks in equal parts, and the sub-tanks symmetrical about the longitudinal central plane of the anti-rolling tank (5) are communicated through pipelines.
3. The upright column floating wind turbine foundation according to claim 1, wherein a sensor for monitoring flow rate is arranged on the pipeline, and a water level monitoring sensor is arranged in the anti-rolling tank (5).
4. The upright post floating wind turbine foundation according to claim 1, wherein the anti-rolling tanks (5) are provided in three layers, each layer of anti-rolling tanks (5) being independent of each other.
5. The upright column floating type fan foundation according to claim 1, wherein the number of the sub-cabins is even, the upper parts of two opposite sub-cabins in the sub-cabins are communicated through an upper communicating pipe, and the lower parts of two opposite sub-cabins in the sub-cabins are communicated through a lower communicating pipe.
6. An upright post floating wind turbine foundation according to claim 1, wherein the anti-roll tank (5) is provided with at least four sub-tanks.
7. The upright post floating wind turbine foundation of claim 1, wherein the foundation structure (3) is assembled by axially welding steel cylinder segments, and the steel cylinder segments are rolled by steel plates.
8. The upright floating wind turbine foundation according to claim 1, wherein the junction of the equal section upright (31) and the variable section upright (32) is smoothly transitioned.
9. The upright column floating wind turbine foundation according to claim 1, wherein the surfaces of the mooring system (4) and the foundation structure (3) are provided with a corrosion resistant coating.
10. An upright column floating type wind generating set is characterized by comprising a fan (1), a tower frame (2) and a foundation, wherein the fan (1) is arranged at the top end of the tower frame (2), the tower frame (2) is arranged on the foundation, and the foundation adopts the upright column floating type fan foundation as claimed in claim 1; the top end face of the foundation structure (3) is not smaller than the diameter of the bottom end face of the tower (2).
CN202023309196.2U 2020-12-30 2020-12-30 Vertical column floating type fan foundation and wind generating set Active CN214035965U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202023309196.2U CN214035965U (en) 2020-12-30 2020-12-30 Vertical column floating type fan foundation and wind generating set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202023309196.2U CN214035965U (en) 2020-12-30 2020-12-30 Vertical column floating type fan foundation and wind generating set

Publications (1)

Publication Number Publication Date
CN214035965U true CN214035965U (en) 2021-08-24

Family

ID=77344844

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202023309196.2U Active CN214035965U (en) 2020-12-30 2020-12-30 Vertical column floating type fan foundation and wind generating set

Country Status (1)

Country Link
CN (1) CN214035965U (en)

Similar Documents

Publication Publication Date Title
CN109026551B (en) Novel floating type wind turbine foundation platform based on tuned liquid column oscillation damper
WO2018095304A1 (en) Movable ballast leveling control device for use in floating wind turbine
CN112523969B (en) Truss inhaul cable type floating offshore wind turbine structure
CN212243737U (en) Marine floating type fan foundation and fan
CN110001877B (en) Variable cross-section type three-floating offshore wind power foundation
CN112628087A (en) Semi-submersible offshore wind turbine unit, foundation and heave plate
CN114228929B (en) Tension leg ocean platform for offshore photovoltaic power generation
CN113086115A (en) Shallow sea wind power semi-submersible platform provided with anti-heaving stand column
CN112319717A (en) Full-submersible offshore wind turbine floating platform with inclined side columns
CN214304175U (en) Deep sea floating type fan foundation in gridding arrangement
CN214035965U (en) Vertical column floating type fan foundation and wind generating set
CN112610426A (en) Marine semi-submerged formula fan foundation and wind generating set
CN219220634U (en) Marine floating type fan foundation
CN112339924A (en) Platform foundation structure of semi-submersible offshore wind generating set
CN218816768U (en) Floating type fan foundation and floating type fan
CN108442399B (en) Light anti-seismic jacket foundation adopting complete joint pipe nodes
CN214145768U (en) Floating type fan foundation adopting groove type anti-rolling water tank and wind generating set
CN112594139A (en) Vertical column floating type fan foundation and wind generating set
CN115539312A (en) Floating offshore wind turbine generator with stay cables
CN215245406U (en) Split type showy fan base and showy fan
CN216044184U (en) Barge type offshore wind power floating foundation
CN209938890U (en) Variable-cross-section three-floating-body offshore wind power foundation
CN210766857U (en) Floating foundation of offshore wind turbine with combined jacket and floating barrel
CN111997841B (en) Floating type fan generator set
CN112594140A (en) Floating type fan foundation adopting groove type anti-rolling water tank and wind generating set

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant