CN110566616A - passive variable-rigidity non-smooth vibration absorber - Google Patents
passive variable-rigidity non-smooth vibration absorber Download PDFInfo
- Publication number
- CN110566616A CN110566616A CN201910874839.0A CN201910874839A CN110566616A CN 110566616 A CN110566616 A CN 110566616A CN 201910874839 A CN201910874839 A CN 201910874839A CN 110566616 A CN110566616 A CN 110566616A
- Authority
- CN
- China
- Prior art keywords
- outer frame
- permanent magnet
- vibration absorber
- guide rail
- mass block
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F6/00—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid
- F16F6/005—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid using permanent magnets only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/104—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/06—Magnetic or electromagnetic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/06—Stiffness
- F16F2228/066—Variable stiffness
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention provides a passive variable-stiffness non-smooth vibration absorber, which relates to the technical field of vibration absorption and vibration reduction and comprises the following components: the device comprises an outer frame, a permanent magnet, a spring, a mass block and a guide rail; the top and the bottom of the outer frame are respectively provided with two permanent magnets; the mass block is provided with a groove, the groove faces the top of the outer frame, and one side of the permanent magnet at the bottom of the outer frame is provided with a permanent magnet, and the groove and the permanent magnet are fixedly connected and/or detachably connected; two hanging lugs are respectively arranged on the left side and the right side of the outer frame, each hanging lug is connected with one end of a spring, and the other end of each spring is connected with the mass block; the center of the mass block is provided with a through hole, one end of the guide rail is connected with the top of the outer frame, the other end of the guide rail is connected with the bottom of the outer frame, and the guide rail penetrates through the through hole. The vibration absorber provided by the invention can solve the problem of failure of a pure nonlinear vibration absorber caused by large change of external load in the prior art, and the effective excitation amplitude range of the vibration absorber is expanded.
Description
Technical Field
the invention relates to the technical field of vibration absorption and shock absorption, in particular to a passive variable-stiffness non-smooth vibration absorber.
Background
the passive pure nonlinear vibration absorber has the characteristic of broadband vibration absorption and shows remarkable advantages under the excitation condition with complex frequency components. However, when the excitation amplitude is greatly changed, the pure nonlinear vibration absorber can only have the vibration absorbing effect within a certain excitation range, and beyond the excitation range, the pure nonlinear vibration absorber can fail and even generate side effects. The passive variable-stiffness non-smooth vibration absorber has the advantage of broadband vibration absorption of a pure non-linear vibration absorber, and due to the introduction of the magnetic device, the variable-stiffness non-smooth vibration absorber has a larger effective excitation range than the pure non-linear vibration absorber.
in summary, the pure nonlinear vibration absorber in the prior art has the problem that the vibration absorber fails due to the large load change, so that the effective excitation amplitude range of the vibration absorber can be widened by using the variable stiffness vibration absorber structure.
Disclosure of Invention
In view of the above, the present invention provides a passive variable stiffness non-smooth vibration absorber, which can widen the effective excitation range of the vibration absorber with a variable stiffness vibration absorber structure
In a first aspect, an embodiment of the present invention provides a passive variable-stiffness non-smooth vibration absorber, including: the device comprises an outer frame, a permanent magnet, a spring, a mass block and a guide rail;
the top and the bottom of the outer frame are respectively provided with two permanent magnets;
The mass block is provided with a groove, the permanent magnet is arranged on the groove facing the top of the outer frame and one side of the permanent magnet at the bottom of the outer frame, and the groove and the permanent magnet are fixedly connected and/or detachably connected;
Two hanging lugs are respectively arranged on the left side and the right side of the outer frame, each hanging lug is connected with one end of each spring, and the other end of each spring is connected with the mass block; all springs are in a freely extended state.
the center of the mass block is provided with a through hole, one end of the guide rail is connected with the top of the outer frame, the other end of the guide rail is connected with the bottom of the outer frame, and the guide rail penetrates through the through hole.
preferably, the damping coefficient of the side of the guide rail close to the top and the bottom of the outer frame is greater than the damping coefficient of the middle of the guide rail.
Preferably, the permanent magnet arranged on the groove and facing the top of the outer frame is attracted with the permanent magnet arranged on the top of the outer frame;
The permanent magnet arranged on the groove and facing the bottom of the outer frame is attracted with the permanent magnet arranged on the bottom of the outer frame.
The embodiment of the invention has the following beneficial effects: the invention provides a passive variable-stiffness non-smooth vibration absorber, which comprises: the device comprises an outer frame, a permanent magnet, a spring, a mass block and a guide rail; the top and the bottom of the outer frame are respectively provided with two permanent magnets; the mass block is provided with a groove, the groove faces the top of the outer frame, and one side of the permanent magnet at the bottom of the outer frame is provided with a permanent magnet, and the groove and the permanent magnet are fixedly connected and/or detachably connected; two hanging lugs are respectively arranged on the left side and the right side of the outer frame, each hanging lug is connected with one end of a spring, and the other end of each spring is connected with the mass block; the center of the mass block is provided with a through hole, one end of the guide rail is connected with the top of the outer frame, the other end of the guide rail is connected with the bottom of the outer frame, and the guide rail penetrates through the through hole. The vibration absorber provided by the invention can solve the problem of failure of a pure nonlinear vibration absorber caused by large change of external load in the prior art, and the effective excitation range of the vibration absorber is expanded.
additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
in order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a three-dimensional view of a passive variable stiffness non-smooth vibration absorber according to an embodiment of the present invention;
fig. 2 is a front view of a passive variable stiffness non-smooth vibration absorber according to an embodiment of the present invention;
Fig. 3 is a three-view diagram of a passive variable stiffness non-smooth vibration absorber mass according to an embodiment of the present invention.
Icon: 1-a frame; 2-permanent magnets; 3-a mass block; 4-extension spring; 5, a guide rail.
Detailed Description
to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, the problem that a vibration absorber fails due to the fact that load of a pure nonlinear vibration absorber in the prior art is greatly changed exists, and therefore the passive variable-stiffness non-smooth vibration absorber provided by the embodiment of the invention can expand the effective excitation range of the vibration absorber by utilizing the variable-stiffness vibration absorber structure.
For the understanding of the present embodiment, a passive variable stiffness non-smooth vibration absorber disclosed in the embodiments of the present invention will be described in detail first.
The embodiment of the invention provides a passive variable-stiffness non-smooth vibration absorber, which comprises: the device comprises an outer frame, a permanent magnet, a spring, a mass block and a guide rail;
the top and the bottom of the outer frame are respectively provided with two permanent magnets;
The mass block is provided with a groove, the permanent magnet is arranged on the groove facing the top of the outer frame and one side of the permanent magnet at the bottom of the outer frame, and the groove and the permanent magnet are fixedly connected and/or detachably connected;
Two hanging lugs are respectively arranged on the left side and the right side of the outer frame, each hanging lug is connected with one end of each spring, and the other end of each spring is connected with the mass block;
further, all the springs are in a free extension state;
The center of the mass block is provided with a through hole, one end of the guide rail is connected with the top of the outer frame, the other end of the guide rail is connected with the bottom of the outer frame, and the guide rail penetrates through the through hole.
specifically, the permanent magnet arranged on the groove and facing the top of the outer frame is attracted with the permanent magnet arranged on the top of the outer frame;
The permanent magnet arranged on the groove and facing the bottom of the outer frame is attracted with the permanent magnet arranged on the bottom of the outer frame;
The frame (1) is made of light alloy with high strength, such as titanium alloy or aluminum alloy, and can be fixed on the system to be damped in a bolt connection mode;
In some embodiments, the permanent magnet is detachably connected with the frame (1) and the mass block, so that a through hole is formed in the permanent magnet (2), threaded holes are formed in corresponding positions of the frame (1) and the mass block (3), the permanent magnet (2) is connected with the frame (1) and the mass block (3) through bolts, four pairs of permanent magnets are formed, and the two permanent magnets in each pair attract each other; the mass block (3) and the extension spring (4) are made of stainless steel materials which cannot be attracted by the permanent magnet; the frame (1) and the mass block (3) are both provided with hangers for connecting the extension spring (4); one end of each extension spring (4) is arranged on the frame (1), the other end of each extension spring is arranged on the mass block (3) and is perpendicular to the guide rail, and the four extension springs are arranged in the same way; the guide rail (5) is fixed at the center of the frame (1), a friction pair is formed between the guide rail and the inner surface of the mass block (3) after the surface of the guide rail is coated, the coating can be made of polytetrafluoroethylene, the coating is divided into three sections, the length and the damping coefficient of the upper section and the lower section are the same, and the damping coefficient of the upper section and the lower section is larger than that of the middle section.
when the vibration energy of the system to be damped is transmitted to the vibration absorber, the mass block (3) performs frictional sliding along the guide rail (5), and friction by-products formed by the mass block and the guide rail generate frictional dissipation energy; the four extension springs (4) can generate pure cubic nonlinear stiffness, and the pure cubic nonlinear stiffness enables the vibration absorber to have broadband vibration absorption capacity; a certain distance is kept between each pair of permanent magnets, and when the amplitude of the mass block is small, the magnetic force between the permanent magnets is extremely small and can be ignored; when the amplitude of the mass block is increased to a certain degree, the attraction force between the permanent magnets can play a role in reducing the rigidity of the whole vibration absorber, so that the occurrence of sudden failure is restrained.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A passive variable stiffness non-smooth vibration absorber comprising: the device comprises an outer frame, a permanent magnet, a spring, a mass block and a guide rail;
The top and the bottom of the outer frame are respectively provided with two permanent magnets;
The mass block is provided with a groove, the permanent magnet is arranged on the groove facing the top of the outer frame and one side of the permanent magnet at the bottom of the outer frame, and the groove and the permanent magnet are fixedly connected and/or detachably connected;
Two hanging lugs are respectively arranged on the left side and the right side of the outer frame, each hanging lug is connected with one end of each spring, and the other end of each spring is connected with the mass block;
The center of the mass block is provided with a through hole, one end of the guide rail is connected with the top of the outer frame, the other end of the guide rail is connected with the bottom of the outer frame, and the guide rail penetrates through the through hole.
2. The passive variable stiffness non-smooth vibration absorber according to claim 1 wherein the damping coefficient of the side of the guide rail near the top and bottom of the housing is greater than the damping coefficient of the middle of the guide rail.
3. The passive variable stiffness non-smooth vibration absorber according to claim 1, wherein the permanent magnet installed in the groove toward the top of the outer frame is attracted to the permanent magnet installed in the top of the outer frame;
The permanent magnet arranged on the groove and facing the bottom of the outer frame is attracted with the permanent magnet arranged on the bottom of the outer frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910874839.0A CN110566616A (en) | 2019-09-17 | 2019-09-17 | passive variable-rigidity non-smooth vibration absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910874839.0A CN110566616A (en) | 2019-09-17 | 2019-09-17 | passive variable-rigidity non-smooth vibration absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110566616A true CN110566616A (en) | 2019-12-13 |
Family
ID=68780434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910874839.0A Pending CN110566616A (en) | 2019-09-17 | 2019-09-17 | passive variable-rigidity non-smooth vibration absorber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110566616A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111140616A (en) * | 2020-01-14 | 2020-05-12 | 天津理工大学 | Negative stiffness enhanced nonlinear vibration absorber |
| CN112555320A (en) * | 2020-12-08 | 2021-03-26 | 中国民航大学 | Segmented smooth bistable negative-stiffness vibration absorber based on permanent magnet and compression spring assembly |
| CN114087308A (en) * | 2021-11-22 | 2022-02-25 | 天津理工大学 | Electromagnetic type non-smooth vibration absorber |
| CN114483877A (en) * | 2022-03-24 | 2022-05-13 | 中南大学 | Gravity compensation nonlinear energy trap vibration damper |
| CN114810895A (en) * | 2022-04-26 | 2022-07-29 | 天津理工大学 | Sectional type bumps bullet intensive type non-smooth bump leveller |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120068119A (en) * | 2010-12-17 | 2012-06-27 | 현대중공업 주식회사 | High damping horizontal dynamic absorber |
| CN205134603U (en) * | 2015-11-12 | 2016-04-06 | 同济大学 | Two degree of freedom bump levellers based on nonlinearity energy trap |
| CN206128341U (en) * | 2016-09-07 | 2017-04-26 | 同济大学 | A damping device for large -span structure |
| CN206128342U (en) * | 2016-09-07 | 2017-04-26 | 同济大学 | A vertical tuned mass damper for model test |
| WO2017074175A1 (en) * | 2015-10-29 | 2017-05-04 | Universiti Putra Malaysia | A nonlinear spring bracing device |
| CN106639022A (en) * | 2016-10-11 | 2017-05-10 | 东北林业大学 | Novel nonlinear earthquake reduction device |
| CN107965543A (en) * | 2017-11-28 | 2018-04-27 | 天津理工大学 | A kind of more string formula nonsmooth nonlinearities bump levellers |
| CN108716521A (en) * | 2018-06-01 | 2018-10-30 | 中国人民解放军海军工程大学 | A kind of energy gathering apparatus based on nonlinear energy trap |
| CN109780130A (en) * | 2019-02-28 | 2019-05-21 | 西安理工大学 | A kind of nonlinear energy trap shock-absorbing means for whole star vibration suppression |
| CN209324914U (en) * | 2018-12-29 | 2019-08-30 | 北京金风科创风电设备有限公司 | Damper and wind power generating set |
-
2019
- 2019-09-17 CN CN201910874839.0A patent/CN110566616A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120068119A (en) * | 2010-12-17 | 2012-06-27 | 현대중공업 주식회사 | High damping horizontal dynamic absorber |
| WO2017074175A1 (en) * | 2015-10-29 | 2017-05-04 | Universiti Putra Malaysia | A nonlinear spring bracing device |
| CN205134603U (en) * | 2015-11-12 | 2016-04-06 | 同济大学 | Two degree of freedom bump levellers based on nonlinearity energy trap |
| CN206128341U (en) * | 2016-09-07 | 2017-04-26 | 同济大学 | A damping device for large -span structure |
| CN206128342U (en) * | 2016-09-07 | 2017-04-26 | 同济大学 | A vertical tuned mass damper for model test |
| CN106639022A (en) * | 2016-10-11 | 2017-05-10 | 东北林业大学 | Novel nonlinear earthquake reduction device |
| CN107965543A (en) * | 2017-11-28 | 2018-04-27 | 天津理工大学 | A kind of more string formula nonsmooth nonlinearities bump levellers |
| CN108716521A (en) * | 2018-06-01 | 2018-10-30 | 中国人民解放军海军工程大学 | A kind of energy gathering apparatus based on nonlinear energy trap |
| CN209324914U (en) * | 2018-12-29 | 2019-08-30 | 北京金风科创风电设备有限公司 | Damper and wind power generating set |
| CN109780130A (en) * | 2019-02-28 | 2019-05-21 | 西安理工大学 | A kind of nonlinear energy trap shock-absorbing means for whole star vibration suppression |
Non-Patent Citations (1)
| Title |
|---|
| MOHAMMAD A.AL-SHUDEIFAT: "Asymmetric Magnet-Based Nonlinear Energy Sink", 《JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111140616A (en) * | 2020-01-14 | 2020-05-12 | 天津理工大学 | Negative stiffness enhanced nonlinear vibration absorber |
| CN112555320A (en) * | 2020-12-08 | 2021-03-26 | 中国民航大学 | Segmented smooth bistable negative-stiffness vibration absorber based on permanent magnet and compression spring assembly |
| CN114087308A (en) * | 2021-11-22 | 2022-02-25 | 天津理工大学 | Electromagnetic type non-smooth vibration absorber |
| CN114087308B (en) * | 2021-11-22 | 2024-02-09 | 天津理工大学 | Electromagnetic non-smooth vibration absorber |
| CN114483877A (en) * | 2022-03-24 | 2022-05-13 | 中南大学 | Gravity compensation nonlinear energy trap vibration damper |
| CN114810895A (en) * | 2022-04-26 | 2022-07-29 | 天津理工大学 | Sectional type bumps bullet intensive type non-smooth bump leveller |
| CN114810895B (en) * | 2022-04-26 | 2023-08-29 | 天津理工大学 | Sectional type bump ball enhanced non-smooth vibration absorber |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110566616A (en) | passive variable-rigidity non-smooth vibration absorber | |
| CN110566617A (en) | magnetism-rigidity-based non-smooth vibration absorber | |
| US10655699B2 (en) | Self-tuned mass damper and system comprising the same | |
| CN109356961B (en) | Mechanism for amplifying negative stiffness coefficient and ultralow frequency shock absorber formed by same | |
| CN108916301B (en) | A kind of electromagnetic type active control bump leveller | |
| US20220235846A1 (en) | Vibration damping bracket and electronic device | |
| CN109505922B (en) | Multistable nonlinear energy trap with piecewise linear beam and permanent magnet negative stiffness | |
| RU2279584C1 (en) | Rubber vibration isolator for equipment | |
| Burdisso et al. | A new dual-reaction mass dynamic vibration absorber actuator for active vibration control | |
| CN111075884B (en) | Shock absorber based on Stewart configuration | |
| CN111140616A (en) | Negative stiffness enhanced nonlinear vibration absorber | |
| Shin | On the performance of a single degree-of-freedom high-static-low-dynamic stiffness magnetic vibration isolator | |
| CN112555320B (en) | Segmented smooth bistable negative-stiffness vibration absorber based on permanent magnet and compression spring assembly | |
| KR20120105882A (en) | Mr damper having low fluid resistance | |
| Du Plooy et al. | The development of a tunable vibration absorbing isolator | |
| JP2021038841A (en) | Liquid-mechanical isolator | |
| JP2013232453A (en) | Seismic control structure of cabinet | |
| JP2013053653A (en) | Earthquake attenuation stopper of vibration elimination pedestal | |
| CN110528717B (en) | Inclined strut damper based on magnetorheological elastomer | |
| JP5917751B2 (en) | Anti-vibration stopper for vibration isolation frame | |
| CN114087308B (en) | Electromagnetic non-smooth vibration absorber | |
| CN113883214A (en) | Magnetism-touch enhanced non-smooth vibration absorber | |
| JP2013241949A (en) | Vibration-proof structure | |
| CN209891044U (en) | Viscous damper and bridge | |
| CN112128309A (en) | Wall-mounted damper and wall-mounted display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20191213 |
|
| WD01 | Invention patent application deemed withdrawn after publication |