CN109494132A - A kind of double-contact breaker of plastic casing - Google Patents
A kind of double-contact breaker of plastic casing Download PDFInfo
- Publication number
- CN109494132A CN109494132A CN201811651526.0A CN201811651526A CN109494132A CN 109494132 A CN109494132 A CN 109494132A CN 201811651526 A CN201811651526 A CN 201811651526A CN 109494132 A CN109494132 A CN 109494132A
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- Prior art keywords
- contact
- touch spring
- sub
- moving
- moving contact
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- 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.)
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- 239000004033 plastic Substances 0.000 title claims abstract description 19
- 230000003068 static effect Effects 0.000 claims abstract description 67
- 238000005516 engineering process Methods 0.000 abstract description 13
- 230000009471 action Effects 0.000 abstract description 3
- 230000005520 electrodynamics Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 238000010010 raising Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
Landscapes
- Breakers (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The present invention relates to a kind of double-contact breaker of plastic casing, it include the moving contact for being pivotally mounted to the contact supporting, and it can make to rotate or rotate clockwise counterclockwise relative to the contact supporting, it is characterized by: the both ends of moving contact are respectively arranged with the first moving contact and the second moving contact, the static contact setting is on the housing and in U-typed, there are two the static contact also has, it include the first static contact and the second static contact, compared with prior art, the advantage of the invention is that unique U-shaped static contact can realize pre- breaking technology, so-called pre- breaking technology refers to when short circuit current flows through contact system, what the electric power generated on U-shaped static contact and moving contact excluded each other；Short circuit current is bigger, and the electric power repelled each other is also bigger, and generates simultaneously with short circuit current；Before trip action generation, electrodynamic repulsion force can just be such that dynamic/static contact separates, and increase equivalent resistance between them by elongating arc, achieve the purpose that short circuit current is inhibited to rise.
Description
Technical field
The present invention relates to a kind of breaker more particularly to a kind of double-contact breaker of plastic casing.
Background technique
Existing breaker belongs to a kind of electric current that can be closed, carry and cut-off under normal loop condition, and can close,
The switching device of the electric current under abnormal loop condition (including short circuit condition) is carried and cut-off before the deadline.Generally,
The component of existing breaker includes tripping, lock, upper connecting rod, lower link, moving contact rack, moving contact and two static contacts,
In, moving contact includes two moving contact contacts, and each static contact is both provided with a static contact contact.
And contact arc-extinguishing system is mainly made of dynamic/static contact and arc-chutes, dynamic/static contact and arc extinguishing in older generation's product
Room is mounted in pedestal, and is mounted in three-phase integrated shaft due to moving contact, thus phase insulation be not very well,
Electric arc is easy to run helter-skelter, and leads to phase fault；In addition, contact arc-extinguishing system carries the vital task of the various fault currents of disjunction,
It is necessary to adopt current limliting new technology to improve short circuit breaking capacity；Finally, low-voltage circuit breaker is opened in the continuous improvement of electrical network capacity
The requirement of cutting capacity is higher and higher, and the theme of breaking capacity and volume as each breaker manufacturer is improving connecting-disconnecting function
Under the premise of, the volume of product is reduced as far as possible, can be saved big quantity space for equipment such as switchgears, can also be saved valuable gold
Belong to.
Summary of the invention
First technical problem to be solved by this invention is to provide a kind of energy raising for above-mentioned state of the art
The double-contact breaker of plastic casing of short circuit breaking capacity.
Second technical problem to be solved by this invention be for above-mentioned state of the art and providing one kind can keep away
Exempt from electric arc in the three alternate double-contact breaker of plastic casing run helter-skelter.
Third technical problem to be solved by this invention be for above-mentioned state of the art and providing one kind can have
Effect solves the double-contact breaker of plastic casing of problem of temperature rise.
The technical scheme of the invention to solve the technical problem is: the double-contact breaker of plastic casing, includes shell
Body, moving contact, static contact and contact supporting, the moving contact can make rotation counterclockwise or rotation clockwise relative to the contact supporting
Turn, it is characterised in that: the both ends of the moving contact are respectively arranged with the first moving contact with the first moving contact contact and have
Second moving contact of the second moving contact contact, on the housing and in U-typed, which also has for the static contact setting
Two, include the first static contact and the second static contact, and the end of first static contact and the second static contact is respectively equipped with
The second of one static contact contact and the second static contact contact, the first moving contact contact of first moving contact and the second moving contact
Moving contact contact can be touched with the first static contact contact of first static contact and the second moving contact of second moving contact
Point contact and separation, to realize the connection and disjunction of electric current.
Further, the contact supporting includes frame body, the frame body equipped with for having the first moving contact and second
The first through hole and the second through-hole and the touch spring being connected in the acting arm that the acting arm of moving contact is stretched out, the contact bullet
Spring has the first moving contact of the acting arm always and the first static contact contact of the first static contact and the second dynamic touching
Head has the trend being in contact with the second static contact contact of the second static contact always.
Further, part is equipped with the first concaveconvex structure and the second concaveconvex structure respectively for the two sides of the acting arm, described
The concaveconvex structure that shell corresponds to the acting arm two sides is equipped with the first positioning column and the second positioning column, and the touch spring includes
There are the first touch spring and the second touch spring, first touch spring includes the first sub- touch spring being connected and
Two sub- touch springs, the first connecting portion between the first sub- touch spring and the second sub- touch spring are connected to described first
The end of concaveconvex structure, the first sub- touch spring and the second sub- touch spring is connected on first positioning column, corresponding
Ground, second touch spring include the sub- touch spring of third and the 4th sub- touch spring being connected, the third touching
Second connecting portion between head spring and the 4th sub- touch spring is connected on second concaveconvex structure, the first sub- contact
The end of spring and the second sub- touch spring is connected on second positioning column.
Preferably, the described first sub- touch spring and the second sub- touch spring and the first connecting portion collectively form " U "
Type, the sub- touch spring of the third and the 4th sub- touch spring and the second connecting portion also collectively form U-typed.
In order to improve arc quenching effect, the position setting of first moving contact and the second moving contact is corresponded on the shell
There are the first arc-chutes and the second arc-chutes.And the first arc-chutes and the second arc-chutes are all made of metal grid short arc and automatic gas
It puts out the new technology that arc combines and improves arc voltage, rise rapidly arc voltage and maintain higher level；It simultaneously can
Using magnetic structure is increased, electric arc is set to enter the first arc-chutes and the second arc-chutes as early as possible, to accelerate blow-out performance.
Intracorporal temperature when arc extinguishing of shell is excessively high in order to prevent, and the shell corresponds to the position of first arc-chutes
With at least one the first air hole, the position that the shell corresponds to second arc-chutes has at least one second ventilative
Hole.It is to generate 2 breakpoints after entire circuit disconnects based on the breaker basic principle that double breaking points technology is mark, can accordingly generates
2 arc voltages.When short circuit current comes, arc burning, which can consume, absorbs big energy, to achieve the purpose that current limliting.
The circuit energy of the more traditional single-break type structure consumption of double break point-type structure is doubled, using double breaking points technology, highest
Breaking capacity reaches 150kA.Since enclosure interior of the invention has 2 breakpoints, contact pressure improves 1 times, accordingly to behaviour
Making the operating force of mechanism, there has also been biggish raisings, increase the arm of force as far as possible in design operation mechanism or change the kind of drive, with
Solve the problems, such as operating force.Double breaking points temperature rise is high compared with single-break type, and since every phase increases a breakpoint, contact resistance is increased
1 times, corresponding temperature rise can also increase, and the present invention solves problem of temperature rise by improving contact pressure with coating is thickened.
Compared with the prior art, the advantages of the present invention are as follows unique U-shaped static contacts can realize pre- breaking technology, so-called pre-
Breaking technology refers to that when short circuit current flows through contact system, the electric power generated on U-shaped static contact and moving contact is mutually to arrange
Reprimand；Short circuit current is bigger, and the electric power repelled each other is also bigger, and generates simultaneously with short circuit current；Before trip action generation, electricity
Dynamic repulsion can just be such that dynamic/static contact separates, and increase equivalent resistance between them by elongating arc, reach inhibition short circuit current
The purpose of rising.
Detailed description of the invention
Fig. 1 is the structural schematic diagram in the embodiment of the present invention inside double-contact breaker of plastic casing；
Fig. 2 is the structural schematic diagram of mono- angle of Fig. 1；
Fig. 3 is the structural schematic diagram of another angle in Fig. 1；
Fig. 4 is the structural schematic diagram of contact supporting in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of frame body in Fig. 4；
Fig. 6 is the structural schematic diagram that the first touch spring and the second touch spring are connected to acting arm in Fig. 4.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
It as shown in figs. 1 to 6, is highly preferred embodiment of the present invention.Double-contact breaker of plastic casing in the present embodiment includes
Shell 1, moving contact, static contact and contact supporting 2, moving contact can make rotation counterclockwise or clockwise relative to the contact supporting 2
Rotation, the both ends of moving contact are respectively arranged with the first moving contact 32 with the first moving contact contact 321 and have the second dynamic touching
Second moving contact 33 of head contact 331, static contact is arranged on shell 1 and is in U-typed, there are two which also has, including
There are the first static contact 41 and the second static contact 42, the end of the first static contact 41 and the second static contact 42 is respectively equipped with the second stationary contact
Head contact 411 and the second static contact contact 421, the first moving contact contact 321 of the first moving contact 32 and the second moving contact 33
Second moving contact contact 331 can be moved with the second static contact contact 411 of the first static contact 41 and the second of the second moving contact 33
Contact contact 331 is contacting and separating, to realize the connection and disjunction of electric current.Wherein, contact supporting 2 includes frame body 21, frame
Body 21 is equipped with the first through hole 22 and second for having the acting arm 31 of the first moving contact 32 and the second moving contact 33 to stretch out and leads to
Hole 23 and the touch spring being connected in the acting arm 31, the touch spring make the first moving contact 32 of acting arm 31 always
Have and the second static contact 42 always with the second static contact contact 411 and the second moving contact 33 with the first static contact 41
The trend that second static contact contact 421 is in contact.Unique U-shaped static contact can realize pre- breaking technology, so-called pre- breaking technology
Refer to when short circuit current flows through contact system, what the electric power generated on U-shaped static contact and moving contact excluded each other；Short circuit
Electric current is bigger, and the electric power repelled each other is also bigger, and generates simultaneously with short circuit current；Before trip action generation, electrodynamic repulsion force is just
Dynamic/static contact can be made to separate, equivalent resistance between them is increased by elongating arc, reach the mesh for inhibiting short circuit current to rise
's.
In addition, part is equipped with the first concaveconvex structure 311 and the second concaveconvex structure 312, shell 1 respectively for the two sides of acting arm 31
Concaveconvex structure corresponding to 31 two sides of acting arm is equipped with the first positioning column 5 and the second positioning column 6, and touch spring includes the first touching
Head spring 7 and the second touch spring 8, the first touch spring 7 include the first sub- touch spring 71 being connected and the second son touching
Head spring 72, the first connecting portion 73 between the first sub- touch spring 71 and the second sub- touch spring 72 are connected to the first concave-convex knot
The end of structure 311, the first sub- touch spring 71 and the second sub- touch spring 72 is connected on the first positioning column 5, accordingly, second
Touch spring 8 includes the sub- touch spring 81 of third and the 4th sub- touch spring 82 being connected, sub- 81 He of touch spring of third
Second connecting portion 83 between 4th sub- touch spring 82 is connected on the second concaveconvex structure 312, the first sub- 71 He of touch spring
The end of second sub- touch spring 72 is connected on the second positioning column 6.First sub- touch spring 71 and the second sub- touch spring 72
U-typed, the sub- touch spring 81 of third and the 4th sub- touch spring 82 and second connecting portion 83 are collectively formed with first connecting portion 73
Also collectively form U-typed.
In order to improve arc quenching effect, the first moving contact 32 is corresponded on shell 1 and the position of the second moving contact 33 is provided with
First arc-chutes 9 and the second arc-chutes 10.And the first arc-chutes 9 and the second arc-chutes 10 are all made of metal grid short arc and oneself
It takes offence and puts out the new technology raising arc voltage that arc combines, rise rapidly arc voltage and maintain higher level；Together
When increasing magnetic structure can be used, so that electric arc is entered the first arc-chutes 9 and the second arc-chutes 10 as early as possible, to accelerate blow-out performance.For
Prevent temperature when arc extinguishing in shell 1 excessively high, the position that shell 1 corresponds to first arc-chutes 9 has at least one
A first air hole 11, the position that shell 1 corresponds to second arc-chutes 10 have at least one second air hole 12.Due to
This double-contact breaker of plastic casing is to generate 2 after entire circuit disconnects based on the breaker basic principle that double breaking points technology is mark
Breakpoint can accordingly generate 2 arc voltages.When short circuit current comes, arc burning, which can consume, absorbs big energy, thus
Achieve the purpose that current limliting.The circuit energy of the more traditional single-break type structure consumption of double break point-type structure is doubled, and uses
Double breaking points technology, highest breaking capacity reach 150kA.Due to there is 2 breakpoints inside shell 1 of the invention, contact pressure is improved
1 times, accordingly to the operating force of operating mechanism, there has also been biggish raisings, increase as far as possible in design operation mechanism the arm of force or
Change the kind of drive, to solve the problems, such as operating force.Double breaking points temperature rise is high compared with single-break type, breaks since every phase increases one
Point, contact resistance increase 1 times, and corresponding temperature rise can also increase, this breaker is by improving contact pressure and thickening plating
Layer solves problem of temperature rise.
Under especially big short-circuit conditions, breaker is also required to carry out trip operation to making electric current cut-off, at this time moving contact by
To the huge electrodynamic repulsion force from the first static contact 41 and the second static contact 42, which makes the first of the first moving contact 32 to move
Contact contact 321 and the second moving contact contact 331 of the second moving contact 33 are from the second static contact contact of the first static contact 41
411 and second static contact contact 421 the separation of the second static contact contact 421, so that realizes breaker cut-offs operation, pressure rapidly
It contracts the first touch spring 7 and the second touch spring 8 is rotated clockwise and separated with the first static contact 41 and the second static contact 42, from
And interrupting short circuit.In addition, novel closed-type contact arc-extinguishing system used by the breaker of plastic casing is by dynamic/static contact and goes out
The high strength plastic materials that arc chamber one reinstates resistance to electric arc seal, and form an enclosed construction, can increase arc-chutes gas
Body pressure, not only greatly improves short circuit breaking capacity, also improves the reliability of short circuit breaking, the contact arc-extinguishing system of each phase
It unites relatively independent, guarantees phase insulation；The arc energy generated when disjunction is mainly born by the type chamber of module, is reduced to open circuit
Thermoplastic material can be used in the intensity requirement of device shell, pedestal.
Claims (6)
- It include shell (1), moving contact, static contact and contact supporting (2) 1. a kind of double-contact breaker of plastic casing, it is described dynamic Contact can be made to rotate or rotate clockwise counterclockwise relative to the contact supporting (2), it is characterised in that: the both ends of the moving contact point It is not provided with the first moving contact (32) with the first moving contact contact (321) and the with the second moving contact contact (331) Two moving contacts (33), the static contact are arranged on the shell (1) and are in U-typed, which includes there are two also having The end of first static contact (41) and the second static contact (42), first static contact (41) and the second static contact (42) is set respectively There are the second static contact contact (411) and the second static contact contact (421), the first moving contact contact of first moving contact (32) (321) and the second moving contact contact (331) of the second moving contact (33) can be with the second stationary contact of first static contact (41) Head contact (411) and the second moving contact contact (331) of second moving contact (33) are contacting and separating, to realize electric current Connection and disjunction.
- 2. double-contact breaker of plastic casing according to claim 1, it is characterised in that: the contact supporting (2) includes frame Body (21), the frame body (21) are equipped with for having the acting arm (31) of the first moving contact (32) and the second moving contact (33) to stretch out First through hole (22) and the second through-hole (23) and the touch spring being connected in the acting arm (31), the touch spring make The first moving contact (32) of the acting arm (31) have always with the second static contact contact (411) of the first static contact (41) with And second moving contact (33) there is the trend that is in contact with the second static contact contact (421) of the second static contact (41) always.
- 3. double-contact breaker of plastic casing according to claim 2, it is characterised in that: distinguish the two sides of the acting arm (31) Part is equipped with the first concaveconvex structure (311) and the second concaveconvex structure (312), and the shell (1) corresponds to the acting arm (31) The concaveconvex structure of two sides is equipped with the first positioning column (5) and the second positioning column (6), and the touch spring includes the first touch spring (7) and the second touch spring (8), first touch spring (7) include the first sub- touch spring (71) being connected and Two sub- touch springs (72), the first connecting portion between the first sub- touch spring (71) and the second sub- touch spring (72) (73) it is connected to first concaveconvex structure (311), the first sub- touch spring (71) and the second sub- touch spring (72) End is connected on first positioning column (5), and accordingly, second touch spring (8) includes third being connected Touch spring (81) and the 4th sub- touch spring (82), the sub- touch spring of third (81) and the 4th sub- touch spring (82) it Between second connecting portion (83) be connected on second concaveconvex structure (312), the first sub- touch spring (71) and second The end of sub- touch spring (72) is connected on second positioning column (6).
- 4. double-contact breaker of plastic casing according to claim 3, it is characterised in that: the first sub- touch spring (71) and Second sub- touch spring (72) and the first connecting portion (73) collectively form U-typed, the sub- touch spring of third (81) and 4th sub- touch spring (82) and the second connecting portion (83) also collectively form U-typed.
- 5. double-contact breaker of plastic casing described in any one according to claim 1~4, it is characterised in that: on the shell (1) Position corresponding to first moving contact (32) and the second moving contact (33) is provided with the first arc-chutes (9) and the second arc-chutes (10)。
- 6. double-contact breaker of plastic casing according to claim 5, it is characterised in that: the shell (1) corresponds to described the The position of one arc-chutes (9) has at least one first air hole (11), and the shell (1) corresponds to second arc-chutes (10) position has at least one second air hole (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651526.0A CN109494132B (en) | 2018-12-31 | 2018-12-31 | Double-contact molded case circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651526.0A CN109494132B (en) | 2018-12-31 | 2018-12-31 | Double-contact molded case circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109494132A true CN109494132A (en) | 2019-03-19 |
| CN109494132B CN109494132B (en) | 2024-04-02 |
Family
ID=65713648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811651526.0A Active CN109494132B (en) | 2018-12-31 | 2018-12-31 | Double-contact molded case circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109494132B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769014A (en) * | 2020-06-06 | 2020-10-13 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Rotary multi-contact-finger contact structure |
| WO2020248556A1 (en) * | 2019-06-11 | 2020-12-17 | 江苏亚开电气有限公司 | Novel double-contact point plastic case circuit breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000188031A (en) * | 1998-12-21 | 2000-07-04 | Terasaki Electric Co Ltd | Contact device of circuit breaker |
| KR20020068143A (en) * | 2001-02-20 | 2002-08-27 | 현대중공업 주식회사 | Twin Repulsive Moving Breaking Contact Unit Of Molded Case Circuit Breaker |
| WO2008049336A1 (en) * | 2006-10-25 | 2008-05-02 | Zhejiang Chint Electrics Co., Ltd | Circuit breaker for rapidly breaking low voltage circuit |
| CN202502961U (en) * | 2012-01-18 | 2012-10-24 | 陈洪元 | Current-limiting liquid magnetic type miniature circuit breaker |
| CN107342178A (en) * | 2017-08-23 | 2017-11-10 | 河北宝凯电气股份有限公司 | A kind of high-breaking miniature breaker |
-
2018
- 2018-12-31 CN CN201811651526.0A patent/CN109494132B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000188031A (en) * | 1998-12-21 | 2000-07-04 | Terasaki Electric Co Ltd | Contact device of circuit breaker |
| KR20020068143A (en) * | 2001-02-20 | 2002-08-27 | 현대중공업 주식회사 | Twin Repulsive Moving Breaking Contact Unit Of Molded Case Circuit Breaker |
| WO2008049336A1 (en) * | 2006-10-25 | 2008-05-02 | Zhejiang Chint Electrics Co., Ltd | Circuit breaker for rapidly breaking low voltage circuit |
| CN202502961U (en) * | 2012-01-18 | 2012-10-24 | 陈洪元 | Current-limiting liquid magnetic type miniature circuit breaker |
| CN107342178A (en) * | 2017-08-23 | 2017-11-10 | 河北宝凯电气股份有限公司 | A kind of high-breaking miniature breaker |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020248556A1 (en) * | 2019-06-11 | 2020-12-17 | 江苏亚开电气有限公司 | Novel double-contact point plastic case circuit breaker |
| CN111769014A (en) * | 2020-06-06 | 2020-10-13 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Rotary multi-contact-finger contact structure |
| CN111769014B (en) * | 2020-06-06 | 2022-05-13 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Rotary multi-contact-finger contact structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109494132B (en) | 2024-04-02 |
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