CN107354867B - A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management - Google Patents
A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management Download PDFInfo
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- CN107354867B CN107354867B CN201710695650.6A CN201710695650A CN107354867B CN 107354867 B CN107354867 B CN 107354867B CN 201710695650 A CN201710695650 A CN 201710695650A CN 107354867 B CN107354867 B CN 107354867B
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- mass block
- spring
- copper sheet
- magneto
- damping unit
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
Abstract
The invention discloses a kind of magneto tuning quality damping units for bridge expanssion joint Disease management, including mass block, the permanent magnet, inside and outside copper sheet and several springs that are distributed on the outside of in mass block and are covered with graphite ene coatings.Inside and outside copper sheet position is fixed, and mass block hangs on the upper mounted plate of the device by spring, and when box beam horizontal vibration causes mass block to swing, the magnetic induction line that permanent magnet generates on the inside of interior copper sheet cut quality block；Cause mass block vertical motion, the magnetic induction line of outer copper sheet cutting outside permanent magnet when box beam vertical motion, vibrational energy is dissipated by the resistance fuel factor of copper sheet.Present apparatus simple structure, it is easy for installation, overcome the shortcomings that traditional Effects of Viscous Fluid Damper oil leak, substantially prolong the service life of damper, improve the damping effect of device；In addition, the damping unit can control beam-ends horizontal direction and vertical displacement simultaneously, the probability for causing expansion joint distortion to destroy because of beam-ends corner is greatly reduced, controls the generation and development of expansion joint disease.
Description
Technical field
Present invention relates particularly to a kind of magneto tuning quality damping units for bridge expanssion joint Disease management.It is related to
Civil engineering vibration control technology field.
Background technique
Expansion joint is the important component of bridge structure, and effect is that bridge is enable to make in temperature change, driving and wind etc.
With lower free extension without generating restraining force.Due to directly bearing Vehicle Load repeatedly, and it is chronically exposed in atmosphere,
Thus use environment is severe, so that expansion joint becomes the most weak part of bridge structure, service life is far smaller than design value, directly
Connecing leads to largely maintenance and renewal cost.
It is shown according to U.S.'s statistical data, the average life span of bridge expanssion joint is 10~15 years, far below setting for bridge itself
Count the service life；Between 8 years that Japanese east name highway is open to traffic, the average repairing number at expansion joint is 1.6 times/seam.As China is handed over
Logical transport undertaking flourishes, and bridge construction quantity and scale and the volume of traffic are continuously increased, so that the damage feelings at expansion joint
Condition is more prominent.It is shown according to the survey data of nineteen ninety, 13 cities such as Beijing's highway department, Tianjin bridge management institute
The bridge management department in city has investigated 556, administrative bridge, wherein the bridge number of expansion gap device destroyed be 271, account for by
Investigate the 48.7% of bridge sum.Bridge expanssion joint not only directly influences traffic safety and road-ability once damaging, and
And influence whether the stress of superstructure, reduce the service life of bridge.
Expansion joint Slope protection is probed into, the destruction to early prevention and discovery expansion joint extends expansion joint service life tool
It is of great significance.Studies have shown that the accumulation displacement of box beam is the main reason for expansion joint is destroyed, temperature deformation only accounts for whole
The fraction that position moves, and wind and vehicular load cause box beam slightly quickly to vibrate the fatigue rupture for leading to supporting beam.Therefore,
It must take measures to reduce box beam vibration, viscous damper and tuning quality damping are mainly installed in existing measure inside box beam
Device (TMD) reduces the reaction of structure under vibration.Viscous damper reduces vibration by consumption vibrational energy, due in damper
Hydraulically full, interior rigidity is almost nil, therefore will not change original structure vibration frequency, and power is ellipse with displacement lagging curve
Circle is advantageous to controlled structure, but there are problems that oil leak and be not easy to conserve, to influence effectiveness in vibration suppression.TMD by mass block,
Spring and damping system composition, drive system to vibrate together, system motion when main structure generates vibration under outer incentive action
The inertia force of generation reacts on main structure tuning inertia force again, it is contrary with exciting force to make it, to reduce main structure
Every response value achievees the purpose that control main structure vibration.Existing small-sized TMD damping element is generally rubber material, large-scale TMD
Using oil damper, but there is ageing of rubber and oil leak and fatigue in two kinds of dampers.
Graphene have excellent electricity, calorifics and mechanical performance, almost can be applied to every field and by people
Concern.The preparation method of graphene was constantly modified in recent years, to produce the graphene of large area, low cost, high quality.
Excellent performance based on graphene will likely become the core material of high speed transistor, high sensor and composite material
Material.Graphene has very strong chemical inertness and stability, and long service life, stability are good.Graphene is prepared on copper surface
Film can be improved the corrosion resistance of copper, and increase conductive and thermal conductivity.
In the magnetic field that non-magnetic conductor is in time-varying or when the cutting magnetic line movement in magnetic field, magnetic flux is caused to be sent out
Changing will generate induced electromotive force according to Faraday's electromagnetic induction law in conductor, to form the electricity of similar whirlpool
Stream, i.e. current vortex.According to eddy current principle, a series of eddy current dampers for field of civil engineering are had developed, such as
CN201010022003 permanent-magnet type eddy current tuned mass damper, the damping of CN201310080464 pendulum-type eddy current tuned mass
Device device etc..
For the vulnerability at expansion joint, although generalling use viscous damper vibration damping at present, to reduction expansion joint cross-bridges
To ineffective with vertical motion, and the problem of oil leak, ageing of rubber, is still inevitable.Utilize the vibration absorber of eddy current principle
It is not in the outstanding advantages of leakage with no friction, but at present still without specifically for mitigation expansion joint all directions vibration
Damping unit, therefore how to efficiently use eddy current principle mitigate expansion joint vibration be the class for getting a good eye value
Topic.
Summary of the invention
Technical problem: to solve expansion joint caused by wind and vehicular load, slightly quickly vibration causes expansion joint to be sent out too early
Raw to destroy, the present invention provides a kind of magneto tuning quality damping unit for bridge expanssion joint Disease management, overcomes existing
The shortcomings that viscous damper, in the cleavable magnetic induction line of different directions, thus effectively mitigate the vibration of bridge expanssion joint all directions,
It is greatly reduced and expansion joint is caused to distort failure probability because of beam-ends corner.
Technical solution: a kind of magneto tuning quality damping unit for bridge expanssion joint Disease management of the invention
Upper mounted plate is connected with the top plate of box beam end, and bottom plate is connect with box beam bottom plate；Between upper mounted plate and bottom plate
Equipped with mass block, permanent magnet is installed in mass block medial and lateral and mass block constitutes entirety, is articulated with upper mounted plate by spring II；
Interior copper sheet in mass block is connected by the spring III in steel sleeve with upper mounted plate, steel sleeve top and upper mounted plate
Bolt；Outer copper sheet and magnetizer are located at the outside of mass block, the upper and lower ends of outer copper sheet and magnetizer respectively with upper mounted plate and
Bottom plate consolidation；Arc panel is located at the lower section of mass block, and spring I is fixed on one end bottom plate, and the other end and arc panel are solid
Knot.
When the mass block horizontal direction moves, change horizontal vibration frequency, horizontal vibration by adjusting the pendulum length of spring II
Frequency calculation formula are as follows:
In formula: g indicates acceleration of gravity；
The pendulum length of l expression spring II.
When the mass block vertical motion, the stiffness elements of magneto tuning quality damping unit are by spring II and spring I
It provides, by adjusting the stiffness change vertical motion frequency of spring II and spring I, vertical motion frequency calculation formula are as follows:
In formula: the equivalent stiffness of k expression spring II and spring I；
The quality of m expression mass block.
Graphite ene coatings are covered with outside the interior copper sheet and outer copper sheet.
Epoxy resin is coated with outside the steel sleeve.
The permanent magnet is NdFeB material.
The ferromagnetic grade of permanent magnetism of face is N, S grades opposite to the permanent magnet up and down on the inside of mass block, and with row's adjacent permanent magnet
Ferromagnetic grade is opposite.
Increase permanent magnet outside the mass block top plate, while in the lower part added copper sheet and be fixed on upper mounted plate.
The steel sleeve flushes place's aperture with mass block top plate lower edge, and is welded in quality in a tapping short slab of limiting
Block top plate, the both ends spring III are connected with limit short slab and interior copper sheet respectively.
The utility model has the advantages that the present invention constitutes permanent magnet and mass block whole by the outside arrangement permanent magnet in mass block,
And copper sheet is installed inside and outside mass block.When Horizontal Vibration occurs for box beam, mass block is caused to swing, interior side copper plate cut quality
The magnetic induction line that block interior permanent magnet generates；When box beam vertical motion, vertical displacement, outside copper sheet cut quality occur for mass block
The magnetic induction line that permanent magnet generates on the outside of block, by eddy current principle it is found that vibrational energy is dissipated by the resistance fuel factor of copper sheet.Separately
Outside, permanent magnet tuning quality damping unit simple installation of the invention is flexible, can by direction across bridge and along bridge to being respectively arranged, thus
Direction across bridge is controlled simultaneously and along displacement of the bridge to beam-ends, is greatly reduced and is caused the general of expansion joint distortion destruction because of beam-ends corner
Rate controls the generation and development of expansion joint disease.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of apparatus of the present invention；
Fig. 2 is the lateral sectional view of apparatus of the present invention；
Fig. 3 is the mass block top view of apparatus of the present invention；
Fig. 4 is I-I sectional view in Fig. 3 of the present invention；
Fig. 5 is the steel bushing bar side view of apparatus of the present invention；
Fig. 6 is II-II sectional view in Fig. 5 of the present invention；
Fig. 7 is the outer copper sheet lateral arrangement figure of apparatus of the present invention；
Have in figure: 1, mass block；2, spring I；3, outer copper sheet；4, interior copper sheet；5, permanent magnet；6, spring II；7, spring
III；8, steel sleeve；9, upper mounted plate；10, box beam top plate；11, bottom plate；12, box beam bottom plate；13, arc panel；14, limit
Short slab；15, magnetizer.
Specific embodiment
The upper mounted plate 9 of the damping unit is connected with the box beam top plate 10 of box beam end, bottom plate 11 and box beam bottom plate
12 connections；Mass block 1 is equipped between upper mounted plate 9 and bottom plate 11, permanent magnet 5 and quality are installed in 1 medial and lateral of mass block
Block 1 constitutes entirety, is articulated with upper mounted plate 9 by spring II6；Interior copper sheet 4 in mass block 1 passes through in steel sleeve 8
Spring III7 is connected with upper mounted plate 9, and 8 top of steel sleeve is bolted with upper mounted plate 9；Outer copper sheet 3 and magnetizer 15 are located at quality
The upper and lower ends of the outside of block 1, outer copper sheet 3 and magnetizer 15 are consolidated with upper mounted plate 9 and bottom plate 11 respectively；Arc panel 13
Positioned at the lower section of mass block 1, spring I2 is fixed on one end bottom plate 11, and the other end and arc panel 13 consolidate.
When to prevent mass block vertical motion, interior copper sheet is vertically being in contact with permanent magnet, in steel sleeve and mass block top
Plate lower edge flushes place's aperture, and tapping sets Horizontal limiting short slab and is connected with spring.When downward displacement occurs for mass block, quality
Block drives the limit short slab of lower edge to move downwardly together, so that spring be made to extend, interior copper sheet occurs to bottom offset.Mass block is vertical
When vibration, the stiffness elements of magneto tuning quality damping unit are provided by spring II and spring I, by adjusting spring II and bullet
The stiffness change vertical motion frequency of spring I, vertical motion frequency calculation formula are as follows:
In formula: k --- the equivalent stiffness of spring II and spring I；
M --- indicate the quality of mass block.
The frequency formula of pendulum-type TMD:
In formula: g --- acceleration of gravity；
L --- indicate the pendulum length of spring II.
By formula (2) it is found that the frequency of pendulum-type TMD is determined by pendulum length, therefore TMD frequency can be made by adjusting the length of spring
Rate reaches design value, and damper performance reaches best.
Graphite ene coatings are covered with outside copper sheet, with make full use of the good electric conductivity of grapheme material and thermal conductivity and
Corrosion resistance, being coated with epoxy resin outside steel sleeve prevents from corroding, and permanent magnet is NdFeB material, the material be current magnetic energy product most
Big material.
The permanent magnet is in arrangement, the top plate and base plate interior permanent magnet arranged opposite of mass block, and magnetic grade is N, S grades of phases
It is right, and it is opposite with row's ferromagnetic grade of adjacent permanent magnet when, magnetic induction intensity reaches maximum value on copper sheet, and scheme is optimal.
It, can outside the mass block top plate in concrete engineering in application, more to increase magnetic flux and cutting efficiency
Increase permanent magnet, while adding copper sheet on mass block top and being fixed on upper mounted plate.
When the loads such as wind and vehicle cause expansion joint to generate slightly quickly vibration, the mass block in box beam will be put
It moves, the magnetic induction line that the permanent magnet inside interior copper sheet cut quality block generates, the permanent magnet on the outside of outer copper sheet cut quality block generates
Magnetic induction line, corresponding induced electromotive force is generated in inside and outside copper sheet, to form current vortex.When conductor is v uniform with speed
It is moved in the B of magnetic field, flows through the current density of conductor are as follows:
J=σ (v × B) (3)
Wherein, the conductivity of σ --- conductor；B --- magnetic induction intensity；J --- electric eddy current density.
The electromagnetic force that conductor current is subject in magnetic field are as follows:
Wherein, the volume of Γ --- conductor.
It is found that damping force is related with the volume of magnetic field and conductor cutting magnetic induction line from formula (3) and (4).
Since conductor directional velocity is vertical with magnetic induction intensity, then the size of F are as follows:
F=- σ δ SB2v (5)
Wherein, the thickness of δ --- conductor；S --- conductive surface product.
In formula (5), negative sign indicates electromagnetic force and cutting magnetic induction line directional velocity on the contrary, according to Lenz's law, and current vortex produces
The raw magnetic field opposite with magnetic field.When copper sheet cutting magnetic induction line, it will form the damping force for preventing the two relative motion, lead
Enable amount is consumed by the resistance fuel factor of copper sheet, final to reduce expansion joint vibration.
As shown in Figure 1, when mass block 1 is swung, the vertical paper direction of swaying direction；As shown in Fig. 2, mass block 1 is sent out
When raw horizontal direction is swung, swaying direction is to swing in face, and sufficiently large sky is arranged in interior 4 swaying direction of copper sheet in mass block 1
Between, prevent interior copper sheet 4 from colliding with 1 inner wall of mass block.The swing week of mass block 1 is controlled by the length of adjustment spring II6
Phase, TMD frequency is made to reach design value, damper performance reaches best.
Be covered with graphite ene coatings outside interior copper sheet 4 and outer copper sheet 3, make full use of the good electric conductivity of grapheme material and
Thermal conductivity and corrosion resistance, being coated with epoxy resin outside steel sleeve 8 prevents from corroding, and permanent magnet 5 is NdFeB material, which is
The maximum material of magnetic energy product at present.11 one end upper spring I2 of bottom plate and bottom plate 11 consolidate, and the other end is consolidated in arc
Plate 13,1 bottom of mass block and the vertical distance of arc panel 13 when static are set as 3~5mm.
As shown in figs. 34,5 arranged opposite of the top plate of mass block 1 and base plate interior permanent magnet, the magnetic of inside face magnet
Grade is opposite for N, S grade, and with row's 5 magnetic grade of adjacent permanent magnets on the contrary, the magnetic induction generated on interior copper sheet 4 and outer copper sheet 3 at this time is strong
Degree is maximum, so that more energy be made to consume by the resistance fuel factor of copper sheet.Arrange quantity according to specific feelings with row's permanent magnet 5
Condition is arranged, but no less than two, can increase permanent magnet 5 outside 1 top plate of mass block, while adding copper on 1 top of mass block
Plate is fixed on upper mounted plate 9.
As shown in Fig. 5~7, when to prevent 1 vertical motion of mass block, interior copper sheet 4 is vertically being in contact with permanent magnet 5,
Steel sleeve 8 flushes place's aperture with 1 top plate lower edge of mass block, and tapping is limited a short slab 14 and spring III7 phase in the horizontal direction
Even.When downward displacement occurs for mass block 1, mass block 1 drives the limit short slab 14 of lower edge to move downwardly together, to make bullet
Spring III7 elongation, interior copper sheet 4 occur to bottom offset.When mass block vertical motion, the rigidity of magneto tuning quality damping unit
Element is provided by spring II and spring I, by the stiffness equivalent vertical motion frequency for changing spring II and spring I.
The foregoing is merely preferred embodiments of the invention, and according to the revealed content of specification, those skilled in the art can
Embodiment is suitably changed and is improved.The invention is not limited to above-mentioned specific embodiment, changes and improve
It should be included in scope of the claims, and term used herein is only for convenience of description, does not cause any restrictions to the present invention.
Claims (9)
1. a kind of magneto tuning quality damping unit for bridge expanssion joint Disease management, which is characterized in that damping dress
The upper mounted plate (9) set is connected with the box beam top plate (10) of box beam end, and bottom plate (11) is connect with box beam bottom plate (12)；?
It is equipped with mass block (1) between upper mounted plate (9) and bottom plate (11), permanent magnet (5) and matter are installed in mass block (1) medial and lateral
Gauge block (1) constitutes entirety, is articulated with upper mounted plate (9) by spring II (6)；Interior copper sheet (4) in mass block (1) passes through
Spring III (7) in steel sleeve (8) is connected with upper mounted plate (9), bolts at the top of steel sleeve (8) with upper mounted plate (9)；Outer copper
Plate (3) and magnetizer (15) are located at the outside of mass block (1), the upper and lower ends of outer copper sheet (3) and magnetizer (15) respectively with it is upper
Fixed plate (9) and bottom plate (11) consolidation；Arc panel (13) is located at the lower section of mass block (1), and spring I (2) one end is fixed on
Bottom plate (11), the other end and arc panel (13) consolidate.
2. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, special
Sign is, when mass block (1) horizontal direction moves, changes horizontal vibration frequency by adjusting the pendulum length of spring II (6), horizontal
Vibration frequency calculates formula are as follows:
In formula: g indicates acceleration of gravity；
The pendulum length of l expression spring II.
3. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, special
Sign is, when mass block (1) vertical motion, the stiffness elements of magneto tuning quality damping unit by spring II (6) and
Spring I (2) is provided, by adjusting the stiffness change vertical motion frequency of spring II (6) and spring I (2), vertical motion frequency meter
Calculate formula are as follows:
In formula: the equivalent stiffness of k expression spring II (6) and spring I (2)；
M indicates the quality of mass block (1).
4. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, special
Sign is, is covered with graphite ene coatings outside the interior copper sheet (4) and outer copper sheet (3).
5. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, special
Sign is, is coated with epoxy resin outside the steel sleeve (8).
6. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, special
Sign is that the permanent magnet (5) is NdFeB material.
7. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, special
Sign is that permanent magnet (5) the magnetic grade of face is N, S grades opposite to the permanent magnet (5) up and down on the inside of mass block (1), and with row
Adjacent permanent magnets (5) magnetic grade is opposite.
8. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, special
Sign is, increases permanent magnet (5) outside mass block (1) top plate, while adding copper sheet on mass block (1) top and being fixed on
Fixed plate (9).
9. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, special
Sign is that the steel sleeve (8) flushes place's aperture with mass block (1) top plate lower edge, and limits a short slab (14) in the tapping
It is welded in mass block top plate, spring III (7) both ends are connected with limit short slab (14) and interior copper sheet (4) respectively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710695650.6A CN107354867B (en) | 2017-08-15 | 2017-08-15 | A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management |
| PCT/CN2018/084943 WO2019033789A1 (en) | 2017-08-15 | 2018-04-27 | Permanent magnet-based tuned mass damper device for deterioration control of bridge expansion joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710695650.6A CN107354867B (en) | 2017-08-15 | 2017-08-15 | A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management |
Publications (2)
| Publication Number | Publication Date |
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| CN107354867A CN107354867A (en) | 2017-11-17 |
| CN107354867B true CN107354867B (en) | 2019-04-30 |
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| CN201710695650.6A Active CN107354867B (en) | 2017-08-15 | 2017-08-15 | A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management |
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| CN (1) | CN107354867B (en) |
| WO (1) | WO2019033789A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107354867B (en) * | 2017-08-15 | 2019-04-30 | 东南大学 | A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management |
| CN107964837A (en) * | 2017-12-06 | 2018-04-27 | 中建空列（北京）工程设计研究院有限公司 | Track joint connecting equipment and the track for including the track joint connecting equipment |
| CN108425986B (en) * | 2018-04-17 | 2023-06-02 | 中铁大桥科学研究院有限公司 | Cylindrical eddy current damping device, damping adjustment method and bridge vibration reduction structure |
| CN110589816B (en) * | 2019-10-12 | 2022-08-30 | 陕西拓讯建筑工程有限公司 | Magnetic suspension filter device of graphene based ultrasonic stripping method |
| CN112283285B (en) * | 2020-10-30 | 2021-07-20 | 湖南大学 | Horizontal tuning cantilever type eddy current damper |
| CN112524196B (en) * | 2020-11-18 | 2021-09-28 | 东南大学 | Eddy current energy dissipation and vibration reduction type bridge expansion joint device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001262512A (en) * | 2000-03-14 | 2001-09-26 | Sumitomo Rubber Ind Ltd | Cable damping device |
| JP2004190776A (en) * | 2002-12-11 | 2004-07-08 | Hitachi Zosen Corp | Bearing device using magnetic viscous fluid |
| CN101761146B (en) * | 2010-01-04 | 2011-08-10 | 湖南大学 | Permanent-magnet type eddy current tuned mass damper |
| CN102031751B (en) * | 2010-12-23 | 2012-06-27 | 湖南大学 | Big-tonnage cantilever type horizontal tuned mass damper for regulating eddy-current damping |
| US8402702B1 (en) * | 2011-04-01 | 2013-03-26 | Roberto Villaverde | Aseismic sliding isolation system using hydromagnetic bearings |
| CN103132628B (en) * | 2013-03-13 | 2015-04-08 | 上海材料研究所 | Pendulum eddy current tuning mass damper device |
| CN103758029B (en) * | 2014-01-10 | 2015-10-07 | 东南大学 | A kind of magneto mass tuning damping unit controlled for suspension cable vibration damping |
| CN104264854B (en) * | 2014-08-28 | 2015-10-28 | 华北水利水电大学 | A kind of electromagnetic levitation type horizontal tuned mass damper |
| CN105804263B (en) * | 2016-04-26 | 2018-02-27 | 同济大学 | A kind of sliding isolated bearing |
| CN107354867B (en) * | 2017-08-15 | 2019-04-30 | 东南大学 | A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management |
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2017
- 2017-08-15 CN CN201710695650.6A patent/CN107354867B/en active Active
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2018
- 2018-04-27 WO PCT/CN2018/084943 patent/WO2019033789A1/en active Application Filing
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| WO2019033789A1 (en) | 2019-02-21 |
| CN107354867A (en) | 2017-11-17 |
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