CN106564621A - X-shaped section extendable member capable of realizing folding and unfolding functions - Google Patents
X-shaped section extendable member capable of realizing folding and unfolding functions Download PDFInfo
- Publication number
- CN106564621A CN106564621A CN201610953661.5A CN201610953661A CN106564621A CN 106564621 A CN106564621 A CN 106564621A CN 201610953661 A CN201610953661 A CN 201610953661A CN 106564621 A CN106564621 A CN 106564621A
- Authority
- CN
- China
- Prior art keywords
- section
- boom
- extendable member
- type
- type section
- 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.)
- Granted
Links
- 238000005452 bending Methods 0.000 claims description 11
- 239000013536 elastomeric material Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 238000005493 welding type Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract 2
- 239000013013 elastic material Substances 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/222—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles for deploying structures between a stowed and deployed state
Abstract
The invention provides an X-shaped section extendable member capable of realizing folding and unfolding functions. Under an unfolding state, the section, perpendicular to the axial direction of the X-shaped section extendable member, of the X-shaped section extendable member (4) is approximately an X-shaped structure; four end parts of the X-shaped structure are bent towards the center of the structure; the X-shaped section extendable member (4) is unfolded after being rolled, and four end parts are outwards expanded to form flat structures; and the X-shaped section extendable member (4) is made of an elastic material. The X-shaped section extendable member provided by the invention has sectional inertial torque greater than that of a STEM section and that of a CTM section; the bent center of the section is superseded with the centroid of the section, so that a high unfolding rate can be realized in a mode of winding the X-shaped section extendable member on a winding shaft after flattening; and moreover, the unfolded extendable member has certain rigidity.
Description
Technical field
The application belongs to spacecraft deployable mechanism design field, and in particular to a kind of to realize drawing the X-type for launching function in
Section boom.
Background technology
Development mechanism was just paid attention to and is applied in the early stage of development of spacecraft technology, wherein, one-dimensional linear type launches
The structure composition of mechanism, process of launching are relatively easy, the development mechanism being always most widely used.Examine from expanded form
Consider, one-dimensional straight line launches boom mechanism and can be divided into：Wire, thin-walled tubular, telescopic, disk compression bar formula, truss-like and inflated type etc.
Several types.Wherein thin-walled tubular extending arm be mainly characterized by it is extensible, can wind gathering on spool, during expansion
Circular tube shaped is changed into from flat；It has, and spreading principle is simple, lightweight, storage rate are high, high reliability, are commonly applied to list
The support arm of pole and dipole antenna, gravity gradient stabilization bar, sensor or camera, expansion support system of solar sail etc..
At present, the cross section geometric form of wound form thin-walled tubular boom mainly has three kinds, Storable Tubular
Extendable Member (STEM), Collapsible Tubular Mast (CTM) and Triangular Rollable
Shown in And Collapsible (TRAC) Boom, (a), (b) and (c) in such as Fig. 2.These three sections are in cross sectional moment of inertia phase
With in the case of, the gathering height of the boom of STEM section forms under rounding state is most long, and CTM takes second place in section, TRAC sections
The gathering height of boom is most short.On the other hand, when with same gathering height, TRAC sections have larger section to be used to
Property square and draw the ratio of height in, but its section thickness is also most wide, after gathering, diameter is longer, and section flexual center and the centre of form are not
Overlap, when around axis of symmetry unstability, along with reversing while bending, easily form Flexural-Torsional Coupling Vibration.
The content of the invention
The purpose of the present invention is to be, the boom section of design section thickness increase it is less in the case of, with than
The bigger cross sectional moment of inertia in STEM and CTM sections is overlapped with the centre of form with the ratio for drawing height in, the flexual center in section, and boom can be flattened
High gathering rate of realizing is wrapped on spool afterwards, and boom has certain rigidity after launching.
For achieving the above object, a kind of X-type section boom for realizing drawing expansion function in that the present invention is provided, the X-type
Section boom in the deployed state, is substantially in X-shaped structure with vertical its axial section, four ends of the X-shaped structure to
Structure centre bends；X-type section boom is drawn in after curling, and causes four ends outwards to launch to tie in flat
Structure；Described X-type section boom is made using elastomeric material.
As the further improvement of above-mentioned technical proposal, including the strip structures of two symmetrical connections, the strip structure
Including planar section and the arc surface section for being symmetricly set in planar section both sides；Two strip structures are vertically by corresponding two planes
Section links together.
Used as the further improvement of above-mentioned technical proposal, the contact surface between two described planar sections is using splicing or welds
The form of connecing links together.
Used as the further improvement of above-mentioned technical proposal, the bending stress of the arc surface section is adopted in X-type section boom
In the range of the yield stress of elastomeric material.
Used as the further improvement of above-mentioned technical proposal, the expanded angle of the arc surface section is between 80 °～90 °.
Used as the further improvement of above-mentioned technical proposal, described elastomeric material is multiple for beryllium-bronze, rustless steel or carbon fiber
Condensation material.
The a kind of of the present invention realizes that gathering launches the advantage of the X-type section boom of function and is：
X-type section proposed by the present invention boom has disymmetry axle, and flexual center is overlapped with the centre of form, is not susceptible to crankling vibration change
Shape.When identical draws height in, with bigger cross sectional moment of inertia, cross sectional moment of inertia has than CTM section and STEM sections
Larger raising, X-axis cross sectional moment of inertia Ix and Y-axis cross sectional moment of inertia Iy increased 77% and 35% respectively than CTM section, compare STEM
Section increased 30 times and 6.7 times.In general, the performance of X-type section boom of the invention is between CTM and TRAC
A kind of trade-off optimization scheme, it had both had disymmetry axle, it is also possible to be used to raising section in the case that thickness increases less is drawn in
Property square.
Description of the drawings
Fig. 1 is a kind of X-type section boom for realizing gathering expansion function in the embodiment of the present invention from rounding state to exhibition
The schematic diagram that open state stretches.
Fig. 2 is the structural representation under the rounding state and deployed condition of different cross section boom.
Fig. 3 is the FEM (finite element) model of the X-type section boom of the present invention.
Fig. 4 is the schematic cross-section of the X-type section boom of the present invention.
Accompanying drawing is identified：
1st, reel 2, planar section
3rd, arc surface section 4, X-type section boom
5th, the FEM (finite element) model 6 of X-type section boom, FEM (finite element) model free end
7th, FEM (finite element) model fixing end
Specific embodiment
With reference to the accompanying drawings and examples a kind of X-type section boom for realizing gathering expansion function of the present invention is entered
Row is described in detail.
The present invention proposes a kind of X-type section --- X Type Extendable Member for realizing drawing expansion function in
(abbreviation XTEM) boom, as shown in figure 1, X-type section boom 4 is in the deployed state, with vertical its axial section substantially
In X-shaped structure, four ends of the X-shaped structure are bent to structure centre；X-type section boom 4 is drawn in after curling,
And four ends are outwards launched in flat structure；Described X-type section boom 4 is made using elastomeric material.
Based on the X-shaped section boom 4 of said structure, under rounding state, four ends of the boom can be flattened and be become
Flat, now rigidity is very low, can be thus wrapped on reel 1；In the deployed state, the boom is stretched out after launching,
Boom section after stretching out is in X-type, now with certain rigidity.
As shown in figure 1, in the present embodiment, described X-shaped section boom 4 includes the strip structure of two symmetrical connections,
Each strip structure all includes two arc surface sections 3 of the little planar section 2 in middle part one and both sides.The two arc surface sections
3 two ends for being symmetricly set in planar section 2, and be in integrative-structure.
Described X-type section boom 4 is needed from the material with high resiliency and high yield strength, it is preferable that selected
Any one material in beryllium-bronze, rustless steel or carbon fibre composite is made.
In order to compare the XTEM sections of X-type section boom 4 and the section inertia of existing section STEM, CTM and TRAC
The size of square, four kinds of section forms of setting depth of section after gathering are consistent, are 24.6mm, and maximum allowable strain is set as
1.5%, four kinds of section form booms are designed on this basis, concrete size is as shown in Fig. 2 the section of multi-form has not
Same thickness, the bending radius of STEM are minimum, and section thickness is also minimum, and the section thickness of CTM takes second place, and TRAC has maximum cutting
Face thickness, and XTEM section thicknesses proposed by the present invention are between CTM and TRAC.
As shown in figure 3, the boom FEM (finite element) model for setting up above-mentioned four kinds of sections solves cross sectional moment of inertia, four kinds of sections are stretched
Pole length is set as 500mm.Each boom adopts cantilever beam form, one end to fix, one end freedom.Stretch using shell unit is discrete
Bar, sets up the FEM (finite element) model 5 of X-type section boom.Analysis type is small deformation static analysis.In FEM (finite element) model, constraint
All degree of freedom of node on 7 section of FEM (finite element) model fixing end, all nodes in 6 section of FEM (finite element) model free end are fixed
A rigid section is formed together.The applying power load at the free end cross-section centroid, direction are respectively two axial directions.By having
Finite element analysis obtain the maximum distortion of four kinds of section form booms.The calculating of cross sectional moment of inertia is become using cantilever beam free end stress
Shape formula：
It is available by formula (1)：
In formula (1), formula (2), Δ is maximum distortion, and F is external force, and L is boom length, and E is elastic modelling quantity, and I is that section is used to
Property square.
The design size of four kinds of multi-form section booms is described in table 1 and the cross sectional moment of inertia for obtaining is calculated.Can
To find out under same gathering height, the moment of inertia in STEM sections is minimum.The bending radius in TRAC sections is maximum, section thickness
Also it is maximum, therefore with maximum cross sectional moment of inertia, but its section thickness also increases more, and its thickness is approximately STEM sections
4 times, be 2.9 times of CTM sections.And the thickness in XTEM sections proposed by the present invention is 2 times of STEM sections, it is CTM sections
1.4 times, and cross sectional moment of inertia improves a lot than CTM section and STEM sections, X-axis cross sectional moment of inertia Ix and Y-axis section inertia
Square Iy increased 77% and 35% than CTM section respectively, increased 30 times and 6.7 times than STEM section.Although open-type section
Torsional rigidity it is not high, but for boom, the ratio of big length diameter determines the first-order modal corresponding to its fundamental frequency
It is mode of flexural vibration, therefore by improving cross sectional moment of inertia to improve bending stiffness be more main target.
The geometric parameter and cross sectional moment of inertia of 1 different cross section form of table
As shown in figure 4, two strip structures of X-type section boom link together at the planar section 2 described in middle part, tool
Body method of attachment can be any method of attachment being currently known, as long as can guarantee that two-part bonding strength can bear boom
Shear stress, it is preferable that using be glued or weld in a kind of connected mode.
Thickness after described planar section 2 links together is t, i.e., the thickness of each strip structure is t/2, described
The radius R of four 3 outer surfaces of arc surface section is consistent, is R, and the XTEM sections of now described X-type section boom 4 have two
Axis of symmetry, i.e., symmetrical along X-axis and Y-axis, its flexual center is overlapped with the centre of form, in its axial compression or transverse bending vibration, it is not easy to
Generation crankling vibration flexing.The bending stress of boom is：Bending stress σ bending in selected materials is ensured in design
Take in the range of stress.In order to maximize the bending stiffness of Y-axis, expanded angle θ is taken between 80 °～90 °.
It should be noted last that, above example is only to illustrate technical scheme and unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be understood by those within the art that, the technical side to the present invention
Case is modified or equivalent, and without departure from the spirit and scope of technical solution of the present invention, which all should be covered in the present invention
Right in the middle of.
Claims (6)
1. it is a kind of to realize drawing the X-type section boom for launching function in, it is characterised in that to launch shape in X-type section boom (4)
Under state, substantially it is in X-shaped structure with vertical its axial section, four ends of the X-shaped structure are bent to structure centre；It is described
X-type section boom (4) is drawn in after curling, and four ends are outwards launched in flat structure；Described X-type section
Boom (4) is made using elastomeric material.
2. it is according to claim 1 to realize drawing the X-type section boom for launching function in, it is characterised in that right including two
The strip structure of connection, the strip structure is claimed to include planar section (2) and be symmetricly set in the arc surface section of planar section (2) both sides
(3)；Corresponding two planar sections (2) are linked together by two strip structures vertically.
3. it is according to claim 2 to realize drawing the X-type section boom for launching function in, it is characterised in that described two
Contact surface between planar section (2) is linked together using splicing or Type of Welding.
4. it is according to claim 2 to realize drawing the X-type section boom for launching function in, it is characterised in that the arc surface
In the range of the yield stress of the elastomeric material adopted in X-type section boom (4) by the bending stress of section (3).
5. it is according to claim 2 to realize drawing the X-type section boom for launching function in, it is characterised in that the arc surface
The expanded angle of section (3) is between 80 °～90 °.
6. it is according to claim 1 to realize drawing the X-type section boom for launching function in, it is characterised in that described elasticity
Material is beryllium-bronze, rustless steel or carbon fibre composite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610953661.5A CN106564621B (en) | 2016-11-03 | 2016-11-03 | It is a kind of to realize the X-type section boom for collapsing expansion function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610953661.5A CN106564621B (en) | 2016-11-03 | 2016-11-03 | It is a kind of to realize the X-type section boom for collapsing expansion function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106564621A true CN106564621A (en) | 2017-04-19 |
| CN106564621B CN106564621B (en) | 2018-10-02 |
Family
ID=58535319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610953661.5A Expired - Fee Related CN106564621B (en) | 2016-11-03 | 2016-11-03 | It is a kind of to realize the X-type section boom for collapsing expansion function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106564621B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108583937A (en) * | 2018-04-19 | 2018-09-28 | 中国科学院国家空间科学中心 | A kind of compression release device of wound form thin-walled tubular boom |
| CN108910089A (en) * | 2018-07-18 | 2018-11-30 | 安徽大学 | A kind of single motor driving humanoid bar unfolding mechanism of four rollers |
| CN108974391A (en) * | 2018-07-18 | 2018-12-11 | 安徽大学 | A kind of humanoid bar cross unfolding mechanism of twin-roll |
| CN110550237A (en) * | 2019-10-12 | 2019-12-10 | 上海宇航系统工程研究所 | Unfolding control device of thin-wall extending arm |
| CN110745257A (en) * | 2019-10-12 | 2020-02-04 | 上海宇航系统工程研究所 | Foldable supporting structure |
| CN110979742A (en) * | 2019-11-29 | 2020-04-10 | 北京卫星制造厂有限公司 | High-expansion-ratio unfolding mechanism suitable for space environment |
| CN111547273A (en) * | 2020-05-14 | 2020-08-18 | 中国人民解放军国防科技大学 | Thin film spacecraft |
| CN113386977A (en) * | 2021-05-24 | 2021-09-14 | 北京科技大学 | Laminated elastic space stretching arm for maintaining electromagnetic wave orthogonality in deformation process |
| CN113415440A (en) * | 2021-07-20 | 2021-09-21 | 哈尔滨工业大学 | Quick expansion supporting device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3528543A (en) * | 1968-08-27 | 1970-09-15 | Eli I Robinsky | Corrugated roll-up structure |
| CN201309598Y (en) * | 2008-12-18 | 2009-09-16 | 北京航空航天大学 | Coiling type Y-shaped cross frame space extending arm without articulation |
| US7895795B1 (en) * | 2007-10-22 | 2011-03-01 | The United States Of America As Represented By The Secretary Of The Air Force | Triangular rollable and collapsible boom |
| CN103712052A (en) * | 2013-12-31 | 2014-04-09 | 王子国 | Flexible thin-walled supporting structure |
| CN103786899A (en) * | 2012-10-26 | 2014-05-14 | 泰勒斯公司 | Motorization system for hinge with flexible rolling tracks |
-
2016
- 2016-11-03 CN CN201610953661.5A patent/CN106564621B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3528543A (en) * | 1968-08-27 | 1970-09-15 | Eli I Robinsky | Corrugated roll-up structure |
| US7895795B1 (en) * | 2007-10-22 | 2011-03-01 | The United States Of America As Represented By The Secretary Of The Air Force | Triangular rollable and collapsible boom |
| CN201309598Y (en) * | 2008-12-18 | 2009-09-16 | 北京航空航天大学 | Coiling type Y-shaped cross frame space extending arm without articulation |
| CN103786899A (en) * | 2012-10-26 | 2014-05-14 | 泰勒斯公司 | Motorization system for hinge with flexible rolling tracks |
| CN103712052A (en) * | 2013-12-31 | 2014-04-09 | 王子国 | Flexible thin-walled supporting structure |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108583937A (en) * | 2018-04-19 | 2018-09-28 | 中国科学院国家空间科学中心 | A kind of compression release device of wound form thin-walled tubular boom |
| CN108910089B (en) * | 2018-07-18 | 2020-07-14 | 安徽大学 | Single-motor-driven four-roller humanoid-shaped rod unfolding mechanism |
| CN108910089A (en) * | 2018-07-18 | 2018-11-30 | 安徽大学 | A kind of single motor driving humanoid bar unfolding mechanism of four rollers |
| CN108974391A (en) * | 2018-07-18 | 2018-12-11 | 安徽大学 | A kind of humanoid bar cross unfolding mechanism of twin-roll |
| CN108974391B (en) * | 2018-07-18 | 2021-03-26 | 安徽大学 | Double-roller herringbone rod cross unfolding mechanism |
| CN110550237A (en) * | 2019-10-12 | 2019-12-10 | 上海宇航系统工程研究所 | Unfolding control device of thin-wall extending arm |
| CN110745257A (en) * | 2019-10-12 | 2020-02-04 | 上海宇航系统工程研究所 | Foldable supporting structure |
| CN110745257B (en) * | 2019-10-12 | 2023-09-15 | 上海宇航系统工程研究所 | Foldable supporting structure |
| CN110979742A (en) * | 2019-11-29 | 2020-04-10 | 北京卫星制造厂有限公司 | High-expansion-ratio unfolding mechanism suitable for space environment |
| CN111547273A (en) * | 2020-05-14 | 2020-08-18 | 中国人民解放军国防科技大学 | Thin film spacecraft |
| CN111547273B (en) * | 2020-05-14 | 2021-05-25 | 中国人民解放军国防科技大学 | Thin film spacecraft |
| CN113386977A (en) * | 2021-05-24 | 2021-09-14 | 北京科技大学 | Laminated elastic space stretching arm for maintaining electromagnetic wave orthogonality in deformation process |
| CN113415440A (en) * | 2021-07-20 | 2021-09-21 | 哈尔滨工业大学 | Quick expansion supporting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106564621B (en) | 2018-10-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106564621B (en) | It is a kind of to realize the X-type section boom for collapsing expansion function | |
| US7895795B1 (en) | Triangular rollable and collapsible boom | |
| US10071823B2 (en) | Extendible boom | |
| US6560942B2 (en) | Open lattice, foldable, self deployable structure | |
| US6345482B1 (en) | Open-lattice, foldable, self-deployable structure | |
| US9528264B2 (en) | Collapsible roll-out truss | |
| US7617639B1 (en) | Tape-spring deployable boom | |
| US9975652B2 (en) | Boxed unwindable solar generator | |
| JP2016130447A (en) | Stowable support apparatus and production method thereof | |
| US20080111031A1 (en) | Deployable flat membrane structure | |
| JP2014527600A (en) | Member and method capable of being deformed into a coiled state and an extended state | |
| CN103712052B (en) | A kind of rollable thin-walled supporting structure | |
| CN110431278B (en) | Extendable mast structure | |
| US20070251185A1 (en) | Dual-bias airbeam | |
| CN105333296A (en) | Negative poisson ratio honeycomb structure based on bistable composite material expandable cylindrical shell | |
| CN103779666A (en) | Air inflation unfolding parabolic cylinder antenna reflecting surface | |
| CN205770210U (en) | A kind of spacecraft closed thin wall bar that can wind gathering | |
| CN107323687B (en) | satellite-borne flexible ultra-light folding carbon fiber stretching rod | |
| CN110745257B (en) | Foldable supporting structure | |
| US9828772B2 (en) | Truss designs, materials, and fabrication | |
| US20210387750A1 (en) | Corrugated Rollable Tubular Booms | |
| US11199005B2 (en) | Bistable collapsible tubular mast boom | |
| CN106499083B (en) | A kind of casing buckling induction support with circumferential trapezoidal induction unit | |
| CN106639463B (en) | A kind of casing buckling induction support with oblique screw type induction unit | |
| CN106760009B (en) | A kind of casing buckling induction support with circumferential pineapple type induction unit |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181002 Termination date: 20211103 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |