CN107393742A - Opening and closing device - Google Patents
Opening and closing device Download PDFInfo
- Publication number
- CN107393742A CN107393742A CN201611168607.6A CN201611168607A CN107393742A CN 107393742 A CN107393742 A CN 107393742A CN 201611168607 A CN201611168607 A CN 201611168607A CN 107393742 A CN107393742 A CN 107393742A
- Authority
- CN
- China
- Prior art keywords
- magnet
- lug boss
- opening
- closing device
- contact
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
-
- 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
- H01H73/18—Means for extinguishing or suppressing arc
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Breakers (AREA)
Abstract
It is an object of the invention to solve following problems; i.e.; in opening and closing device; electric arc is produced when making moving contact be left from fixed contact; due to its reaction force, the protection cap being supported to suction bar vertically can be offset left and right, and the front end of suction bar is mobile and magnetic attracting force reduces; thus performance reduction is blocked, the insulation protection cover kept to suction bar has：Cap, it is covered a part for suction bar and magnet；Lug boss, it extends upward；And linking part, it links cap and lug boss, and the insulation protection cover is configured to, and lug boss abuts with the flank set in framework.
Description
Technical field
The present invention relates to a kind of opening and closing device, and it has the insulation protection cover of the embedded housing for being installed on electrical equipment.
Background technology
As existing opening and closing device, it is known that it is made up of components described below, i.e.,：Fixed contact therefor, it has fixed contact；
Movable contact, it has moving contact；Open-close mechanism section, it makes moving contact be opened and closed relative to fixed contact；Magnetic
Iron, it makes the caused electric arc elongation between fixed contact therefor and movable contact when fixed contact separates with moving contact；
Suction bar, it has the one end for the generating unit for extending to electric arc and the other end of face engagement is carried out with magnet；And protect
Protecting cover, it keeps in the other end of the suction bar to suction bar.
In such opening and closing device, by side of the caused electric arc along suction bar between two contacts and to magnet
Direction be driven, and unrelated with sense of current, now, electric arc is by due to electric arc heat and for example from caused by insulating lid
Ablation gas blows and moves, extends, therefore electric arc can be made rapidly to cool down.It is consequently formed as even in flowing through opposite polarity
Electric current in the case of, can also obtain high blocking performance.(for example, referring to patent document 1).
Patent document 1：Japanese Unexamined Patent Publication 2015-046273 publications
However, in existing opening and closing device as described above, bar guiding is attracted from the magnetic line of force caused by magnet, from suction
The front end for drawing bar produces interlinkage magnetic field towards electric arc, is driven the electric arc to the direction of magnet from the interlinkage magnetic field.Therefore,
The reaction force of the driving force can act on suction bar.On the other hand, contact opposite side of the protection cap only to suction bar is another
One end is kept, and protection cap is kept by framework, but because framework and protection cap are resin-made, therefore in framework and protection
Between lid, can because part making the reason for and how much rock.Thus, the protection cap kept to suction bar can edge
Offset up and down, the front end of suction bar also can vertically move left and right.Because the front end of suction bar is moved, cause to enter electric arc
The interlinkage magnetic field of row driving changes, thus exist due to magnetic attracting force reduces and cause to block performance reduce as ask
Topic.
The content of the invention
The present invention proposes that its object is to provide a kind of one side to suppress suction bar in order to solve the above problems
Moving for front end and ensure high to block reliability, on one side cheap and small-sized opening and closing device.
Opening and closing device of the present invention has：Fixed contact therefor, it has fixed contact；Movable contact, it has
The moving contact for being separated or being contacted with the fixed contact of the fixed contact therefor；Open-close mechanism section, it is to the movable contact
It is driven, carries out the on-off action between the fixed contact and the moving contact；Magnet；The magnet of strip, one
End contacts with the magnetic pole strength of the magnet, at least one of the fixed contact therefor and the movable contact with it is described
Extend between magnet；Protection cap, it is made up of insulating materials, and the magnet is kept；And framework, its collecting are described solid
Determine contact, the movable contact, the open-close mechanism section, the magnet and the magnet, the feature of the opening and closing device
It is, the protection cap has：Cap, it is covered at least a portion of the magnet and the magnet；Lug boss, its
Extend to the top of the open-close mechanism section；And linking part, it links the cap and the lug boss, the protection cap
The lug boss is set to be abutted with the flank set in the framework.
The effect of invention
According to the opening and closing device of the present invention, insulation protection cover has：Cap, it is covered a part for magnet and magnet
Lid；Lug boss, it extends upward；And linking part, it links cap and lug boss, and the insulation protection cover is configured to make convex
The portion of rising abuts with the flank set in framework, therefore, suppresses the movement of the front end of magnet, the interlinkage magnetic field being driven to electric arc
Become stable, using the teaching of the invention it is possible to provide a kind of to ensure the high reliability, on one side inexpensively and small switch device of blocking.
Brief description of the drawings
Fig. 1 is the integrally-built expansion oblique view for representing the opening and closing device that embodiments of the present invention 1 are related to.
Fig. 2 is the oblique view for representing the state after removing cap in Fig. 1.
Fig. 3 is mechanism part and portion of explosion chamber under the closure state for the opening and closing device for being related to embodiments of the present invention 1
The side view that the main part divided is represented with part section.
Fig. 4 is mechanism part and portion of explosion chamber under the off-state for the opening and closing device for being related to embodiments of the present invention 1
The side view that the main part divided is represented with part section.
Fig. 5 is the oblique view for the protection cap for representing the opening and closing device that embodiments of the present invention 1 are related to.
Fig. 6 is that Fig. 4 explosion chamber is wanted into the enlarged view that portion represents with part section.
Fig. 7 is the performance plot illustrated for pair principle relevant with the arc extinguishing method of the electric arc of the present invention.
Fig. 8 is the mechanism part and disappear that the high current for the opening and closing device for being related to embodiments of the present invention 1 is blocked under state
The side view that the main part of arc chamber part is represented with part section.
The explanation of label
1：Fixed contact therefor, 1a：Fixed contact, 2：Movable contact, 2a：Moving contact, 3：Suction bar, 4：Magnet, 5：
Magnetic reinforcing plate, 6：Protection cap, 6a：Cap, 6b：Lug boss, 6c：Linking part, 6d：Recess, 10：Framework, 10a：Flank, 11：Gu
Determine side sub-portion, 12：Drawer at movable side portion of terminal, 15：Flexible conductor, 100：Opening and closing device, 102：Explosion chamber, 103：Switching mechanism
Portion, A：Electric arc, M：The magnetic line of force, g：Fine crack.
Embodiment
Embodiment 1
Below, based on accompanying drawing, the present invention will be described.
In addition, in the various figures, identical label represents identical or equivalent part.
Fig. 1 is the integrally-built expansion oblique view for representing the opening and closing device that embodiments of the present invention 1 are related to, and Fig. 2 is
Represent Fig. 1 in cap is removed after state oblique view.In addition, Fig. 3 is the opening and closing for being related to embodiments of the present invention 1
The side view that the main part of mechanism part and explosion chamber part under the closure state of device is represented with part section, Fig. 4 be by
The main part of mechanism part and explosion chamber part under the off-state for the opening and closing device that embodiments of the present invention 1 are related to is with office
The side view that portion's section represents, Fig. 5 is the oblique view for representing protection cap, and Fig. 6 is that Fig. 2 explosion chamber is wanted into portion with part section
The enlarged view of expression, Fig. 7 are the characteristics illustrated for pair principle relevant with the arc extinguishing method of the electric arc of the present invention
Figure, Fig. 8 is the main part for the mechanism part and explosion chamber part for blocking the high current of opening and closing device under state with part section
The side view of expression.
As shown in Figure 1 and Figure 2, opening and closing device 100 is made up of components described below, i.e.,：Framework 10；Fixed contact therefor 1 and movably connect
Contact element 2, they are installed on the framework 10；Protection cap 6；And the 1st lid 10c1 and the 2nd lid 10c2, they are by overall covering.
Herein, at fixed contact therefor 1, as shown in figure 3, being provided with fixed contact 1a in leading section, touched with the fixation
Point 1a is relatively provided with moving contact 2a in movable contact 2.
In addition, opening and closing device 100 has：Open-close mechanism section 103, it makes the movable contact 2 rotate and be fixed tactile
On-off action between point 1a and moving contact 2a；Magnet 4, it is produced for making to separate with moving contact 2a in fixed contact 1a
When between fixed contact therefor 1 and movable contact 2 elongation of caused electric arc magnetic field；And suction bar 3, it is by strip
Magnet is formed, and one end contacts with the magnetic pole strength of magnet 4, and the other end extends to the side of fixed contact therefor 1.Utilize such magnet
4 and the basic structure of suction bar 3, make to separate with moving contact 2a in fixed contact 1a caused by electric arc by magnet 4 and
Extended along the length direction side of suction bar 3.
In addition, opening and closing device 100 has the framework 10 for being made up of insulant and being housed, being supported to each structure member,
The affixed side portion of terminal 11 and drawer at movable side portion of terminal 12 being attached with outside circuit are installed at the both ends of the framework 10,
In the bottom of framework 10 formed with the explosion chamber 102 for carrying out extinguishing arc to electric arc, the explosion chamber 102 configures fixed touch at one end
Point 1a, in other end distributed magnet 4.
It is provided with the explosion chamber 102：Fixed contact therefor 1, it is integrally formed with affixed side portion of terminal 11, and is providing
Position is provided with fixed contact 1a；Movable contact 2, it is configured to be rotated, and has and is connect with fixed contact 1a
Touch the moving contact 2a of separation；Suction bar 3, it is made up of the magnet of strip, with fixed contact 1a and moving contact 2a
The relative mode in the space that is contacted and separated, one end are configured near the generating region of electric arc；Magnet 4, itself and this
Suction bar 3 abuts (face engagement), the magnetic pole strength relative with the other end end face of suction bar 3 is carried out face engagement with the end face；
And magnetic reinforcing plate 5, it is made up of magnet, is configured at the magnetic pole surface side not abutted with suction bar 3 of the magnet 4.
Also, as shown in fig. 6, be provided with protection cap 6 in the other end periphery of suction bar 3, the protection cap 6 be configured to
Energization direction is relative towards the electric arc A of paper near-end generating region.
In addition, suction bar 3 can also use the forms such as round bar, cuboid, cylindrical shape or polygon-shaped bar.In addition,
Drawer at movable side portion of terminal 12 is connected with movable contact 2 by flexible conductor 15.In addition, the structure and example of part not shown
The opening and closing device of prior art as disclosed in Patent Document 1 etc. is identical.
Below, based on Fig. 5, Fig. 6, the structure as the protection cap 6 for wanting portion in the embodiment 1 is illustrated.
That is, protection cap 6 is made up of insulating materials, as shown in figure 5, having following part and forming, i.e.,：Cap 6a, its
Lower section is covered at least a portion of magnet 4 and suction bar 3；Lug boss 6b, up to be formed as two forked in portion for it；Even
Knot 6c, it forms L-shaped together with lug boss 6b, and cap 6a and lug boss 6b is linked；And the recess 6d of channel-shaped,
It is formed at linking part 6c upper surface.
Flank 10as of the recess 6d of the channel-shaped of the protection cap 6 formed in the above described manner along framework 10 and inserted, such as
Shown in Fig. 6, cap 6a is placed on framework 10, forms the lug boss 6b of L-shaped inside front portion 6b1 and linking part 6c
The recess 6d of upper surface abuts with the flank 10a of framework 10, and the back 6b2 and linking part 6c of lug boss 6b lower section
The bottom 6c1 of rear end side abuts with framework 10, and thus protection cap 6 is fixed on framework 10 by support.
In addition, flexible conductor 15 is arranged via 6b3 between lug boss 6b tines, when assembling opening and closing device 100,
Flexible conductor 15 is prevented to be clipped between framework 10 and protection cap 6 etc. and the obstacle of on-off action as movable contact 2.
Below, action is blocked to the low current of the opening and closing device 100 in the embodiment 1 that forms as described above to say
It is bright.
First, open-close mechanism section 103 is operated from the closure state of the opening and closing device 100 shown in Fig. 3, if made
Movable contact 2 is rotated, then moving contact 2a leaves from fixed contact 1a and turns into off-state.Now, such as Fig. 4 institutes
Show, electric arc A produced between two contacts 1a, 2a, sides of the electric arc A along suction bar 3 and extended to the direction of magnet 4.
Herein, using Fig. 7 model, it is divided into advance stages (A)~(E) and the extinguishing arc principle of electric arc is illustrated,
In the model of the Fig. 7, permanent magnet 4 is used as magnet 4, the suction bar 3 and arc generating position that will be protected by protection cap 6
The end face of opposite side, face engagement is carried out with the magnetic pole strength of the permanent magnet with N poles.
In the figure 7, first, in the advance stages 1 (Fig. 7 A) of extinguishing arc, bar is attracted from magnetic line of force M caused by permanent magnet 4
3 guiding, interlinkage magnetic field is produced from the front end of suction bar 3 towards electric arc A.Lorentz force, electricity are acted on electric arc A by the interlinkage magnetic field
Arc A is driven by the downside direction into Fig. 5.
Next, in the advance stages 2 (Fig. 7 B) of extinguishing arc, with from the front end of suction bar 3 around entering to the S poles of permanent magnet 4
The magnetic line of force M that the mode of side is formed interlinks with powered electric arc A in fig. 7.Electric arc A is introduced into due to the interlinkage magnetic field
The electric arc elongate space extended to the lateral parts of the length direction to suction bar 3.
Next, in the advance stages 3 (Fig. 7 C) of extinguishing arc, the electric arc A of electric arc elongate space is introduced into due to from suction
Draw the magnetic line of force caused by the side along normal of bar 3 and be further introduced into inboard.In being introduced into more due to electric arc A
Side, then it is stronger from magnetic field intensity caused by the side of suction bar 3, therefore electric arc A is difficult to depart from from suction bar 3, can stablize
Ground makes electric arc A be extended to the inboard (right side in figure) of suction bar 3.In addition, in the magnetic to be interlinked with being introduced into the electric arc A of inboard
In the line of force, include in large quantities around entering to the magnetic line of force of the S poles side of permanent magnet 4, by the magnetic force of the direction (right direction in figure)
Interlinkage magnetic field, which can produce, caused by line makes electric arc A to the close power in the inner side of suction bar 3.
Next, in the advance stages 4 (Fig. 7 D) of extinguishing arc, to the close protection cap 6 extremely protected to suction bar 3
Electric arc A, acts on the Lorentz force for the inner side of electric arc A to suction bar 3 being pressed with stronger power.Thus, by electric arc A courts
It is compressed to protection cap 6, the resistance inside electric arc A sharp raises.Also, ablation gas exposes from the electric arc of protection cap 6
Face blows to electric arc A, and thus electric arc A is cooled, and the resistance inside electric arc A further raises.
Finally, in the advance stages 5 (Fig. 7 E) of extinguishing arc, concavity as shown in Figure 7 is provided with a part for protection cap 6
Fine crack g in the case of, electric arc A is introduced to fine crack g using to the Lorentz force that the inner side of suction bar 3 is pressed
It is interior, electric arc A is shunk thinner.Also, the ablation gas of self-insurance protecting cover 6 is blown out around the electric arc A after contraction, electricity
Resistance rise realizes extinguishing arc until untill electric arc A inside is unable to maintain that its electric conductivity.
In addition, according to such construction, also there is identical effect in the case where being powered in the opposite direction, in each extinguishing arc
Advance stages in, as shown in fig. 7, electric arc A constantly extends in a manner of the axle relative to suction bar 3 is symmetrical.In addition, forever
Identical effect can be also obtained in the case that the direction of the magnetic pole strength of magnet 4 is opposite, in the advance stages of each extinguishing arc, electric arc
A constantly extends in a manner of the axle relative to suction bar 3 is symmetrical.In addition, in the opposite feelings of the direction of the magnetic pole strength of permanent magnet 4
Also identical effect can be obtained under condition, in the advance stages of each extinguishing arc, electric arc A is symmetrical with the axle relative to suction bar 3
Mode constantly extend.
So, by using suction bar 3 and permanent magnet 4 or magnet 4, electric arc A can be driven to same direction and makes it
Elongation, it is possible to increase the reliability blocked, without making opening and closing device 100 maximize.
In addition, in the opening and closing device 100 that embodiment 1 is related to, by additional following such structure, can have more aobvious
The effect of work.
That is, opening and closing device 100 has electric arc elongate space portion, empty by the way that permanent magnet (or magnet) is configured at into electric arc elongation
Between portion, so as to expand the tensile length of electric arc, can further improve arc resistance.
In addition, pass through opposite side (the suction bar phase that (face engagement) is not abutted with suction bar 3 in permanent magnet 4 (or magnet 4)
Toss about) magnetic pole strength, the magnetic reinforcing plate 5 being made up of magnet is set, permanent magnet is looped around so as to reduce via suction bar 3
The magnetic resistance for the magnetic circuit that the magnetic line of force around 4 (or magnet 4) is formed, therefore become from magnetic field intensity caused by the surface of suction bar 3
By force, arc performance can further be improved.
Also, by forming magnet 4 by permanent magnet, so as to arcing constant flux, therefore even in from logical
In the weaker galvanic areas of magnetic flux caused by electric conductor (being, for example, less than 1kA), what can also be stablized blocks.
However, interlink and produce with electric arc A in the magnetic field for flowing through fixed contact therefor 1, the electric current of movable contact 2 is generated
Lorentz force interlinked than the magnetic field of magnet 4 with electric arc A in the big high current region of caused Lorentz force, electric arc A is with edge
The straight mode of suction bar 3 is extended, the action without showing electric arc A as shown in Figure 7.In this case, such as Fig. 8 institutes
Showing, electric arc A is attracted bar 3 and cut off, due to ablation occurs the cooling effect realized by suction bar 3, the resistance inside electric arc A
Rise, realizes extinguishing arc.
Next, the action effect in embodiments of the present invention 1 is illustrated.
When carrying out carrying out extinguishing arc This move to electric arc A as described above, to the anti-work of the electric arc A driving forces being driven
Suction bar 3 is firmly acted on, but in present embodiment 1, as shown in fig. 6, the protection cap 6 kept to suction bar 3 is with 4
Position is kept by the mode that framework 10 clips, therefore protection cap 6 will not rock.Therefore, the attraction kept by protection cap 6
Rocking for bar 3 also diminishes.
Further, since setting lug boss 6b in protection cap 6, and protected in a manner of framework 10 clips lug boss 6b
Hold, therefore rocking for protection cap 6 can be suppressed, the rocking for suction bar 3 kept by protection cap 6 also diminishes, and suppresses suction bar 3
The movement of front end, the interlinkage magnetic field being driven to electric arc become stable.As a result, it can form while ensuring that high block can
By the cheap and small-sized opening and closing device 100 in property, one side.
Also, because flexible conductor 15 is arranged via 6b3 between lug boss 6b tines, therefore in assembling opening and closing dress
When putting 100, flexible conductor 15 can be prevented to be clipped between framework 10 and protection cap 6 etc. and to the opening and closing of movable contact 2
The problem of action causes to hinder.
In addition, the present invention is not limited to above-mentioned embodiment, it is appropriate to be carried out in the range of its main idea is not departed from
Deformation, omit.
Claims (3)
1. a kind of opening and closing device, it has：
Fixed contact therefor, it has fixed contact；Movable contact, there is the fixed contact with the fixed contact therefor to be divided for it
From or contact moving contact；Open-close mechanism section, it is driven to the movable contact, carry out the fixed contact with it is described
On-off action between moving contact；Magnet；The magnet of strip, one end contact with the magnetic pole strength of the magnet, in institute
State and extend between at least one of fixed contact therefor and the movable contact and the magnet；Protection cap, it is by insulation material
Material is formed, and the magnet is kept；And framework, it houses described fixed contact therefor, the movable contact, described opened
Mechanism part, the magnet and the magnet are closed,
The opening and closing device is characterised by,
The protection cap has：Cap, it covers at least a portion of the magnet and the magnet；Lug boss, it is to institute
State the top extension of open-close mechanism section；And linking part, it links the cap and the lug boss, and the protection cap makes institute
State lug boss and abutted with the flank set in the framework.
2. opening and closing device according to claim 1, it is characterised in that
The linking part and the lug boss for making the protection cap are formed as L-shaped, make the linking part upper surface and
The preceding surface of the lug boss abuts with the flank, and makes the rear surface of the lug boss and the following table of the linking part
Face abuts with the framework.
3. opening and closing device according to claim 1 or 2, it is characterised in that
The lug boss is formed as two forked, be configured with by between the two forked shape and with the movable contact and movable
The flexible conductor of side sub-portion connection.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016097563A JP6685174B2 (en) | 2016-05-16 | 2016-05-16 | Switchgear |
| JP2016-097563 | 2016-05-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107393742A true CN107393742A (en) | 2017-11-24 |
| CN107393742B CN107393742B (en) | 2019-01-18 |
Family
ID=60338259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611168607.6A Active CN107393742B (en) | 2016-05-16 | 2016-12-16 | Opening and closing device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6685174B2 (en) |
| CN (1) | CN107393742B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107393742B (en) * | 2016-05-16 | 2019-01-18 | 三菱电机株式会社 | Opening and closing device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113284752B (en) * | 2021-05-20 | 2022-09-16 | 浙江万松电气有限公司 | Contact action structure with high electrical parameters for dual-power automatic transfer switching device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078257A (en) * | 2013-03-27 | 2014-10-01 | 三菱电机株式会社 | Switchgear |
| CN204155889U (en) * | 2014-11-14 | 2015-02-11 | 德力西电气有限公司 | A kind of run-on tab mounting structure of circuit breaker |
| CN105140065A (en) * | 2014-06-06 | 2015-12-09 | 三菱电机株式会社 | Switch device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6685174B2 (en) * | 2016-05-16 | 2020-04-22 | 三菱電機株式会社 | Switchgear |
-
2016
- 2016-05-16 JP JP2016097563A patent/JP6685174B2/en active Active
- 2016-12-16 CN CN201611168607.6A patent/CN107393742B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078257A (en) * | 2013-03-27 | 2014-10-01 | 三菱电机株式会社 | Switchgear |
| CN105140065A (en) * | 2014-06-06 | 2015-12-09 | 三菱电机株式会社 | Switch device |
| CN204155889U (en) * | 2014-11-14 | 2015-02-11 | 德力西电气有限公司 | A kind of run-on tab mounting structure of circuit breaker |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107393742B (en) * | 2016-05-16 | 2019-01-18 | 三菱电机株式会社 | Opening and closing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2017208157A (en) | 2017-11-24 |
| JP6685174B2 (en) | 2020-04-22 |
| CN107393742B (en) | 2019-01-18 |
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