CN104409248B - A kind of contact system with automatic arc-blowing function - Google Patents
A kind of contact system with automatic arc-blowing function Download PDFInfo
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- CN104409248B CN104409248B CN201410712829.4A CN201410712829A CN104409248B CN 104409248 B CN104409248 B CN 104409248B CN 201410712829 A CN201410712829 A CN 201410712829A CN 104409248 B CN104409248 B CN 104409248B
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- contact
- arc
- moving contact
- plate
- baffle plate
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- 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
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The present invention discloses a kind of contact system with automatic arc-blowing function, comprise contact support and support the moving contact of unitary rotation with contact, moving contact has the most large opening that separating brake rotates, baffle plate is arranged on moving contact rotationally and is suitable for contacting on the front end of fixed contact, and baffle plate has between biside plate and connection biside plate, faces the arc blow-out plate of arc control device; Also comprise the elastic biasing arrangement of the active force being applied to baffle plate and moving contact separating brake direction of rotation, when moving contact turns to most large opening position and stops operating, baffle plate overcomes elastic biasing arrangement active force and is rotated further along former direction under effect of inertia, set arc blow-out plate blows electric arc and moves to arc control device, strengthen air-blowing effect, improve contact system short circuit breaking capacity; Baffle plate resets under elastic biasing arrangement drives.Contact system structure of the present invention is simple, reliable operation.
Description
Technical field
The present invention relates to a kind of breaker contact system, be specifically related to a kind of contact system with automatic arc-blowing function, belong to low-voltage electrical apparatus attachment technique field.
Background technology
The contact system of low-voltage circuit breaker easily produces electric arc when disjunction, the top of contact system is generally provided with arc control device, arc control device comprise several arc extinguishing grid pieces, gap is had between adjacent arc extinguishing grid pieces, these gaps are main thoroughfares that electric arc outwards discharges, therefore contact system is generally all provided with baffle plate, and the opening of baffle plate, towards arc control device, moves to other direction except arc control device direction for stoping electric arc.
As Chinese patent CN202816838U discloses a kind of moving contact of low-voltage circuit breaker, comprise linkage sets of contacts, parallel conductor, moving contact support, fixed head, location-plate, conductive bus bar and arc insulating cover (baffle plate).Linkage sets of contacts comprises several being set up in parallel and the moving contact sheet of parallel connection, and moving contact sheet is welded by conductor piece and silver contact, and the lower end of moving contact sheet is connected to soft strength conductor, is provided with insulating spacer between every two moving contact sheets.Baffle plate is arranged on moving contact rack, and baffle plate is positioned at the outside of below the silver contact of linkage sets of contacts.
The described baffle plate of the prior art, has two side plates, for stoping electric arc to moving contact two lateral movement; There is the base plate between side plate described in connection two, the arc control device of described base surface above contact system, for stoping electric arc to arc control device motion in the other direction.By the setting of baffle plate, certain restriction is served to the trend of electric arc, facilitation is served to the arc extinguishing of entirety.But in actual use, the contact system of the prior art still exists part electric arc and can not enter into arc control device, cause circuit breaker cannot normally disjunction, even cause circuit breaker scaling loss to cause the risk of accident.
Still having to solve the problem that electric arc can not enter arc control device, having occurred in prior art adopting the arc-initiating device arranged separately to the contact system impelling electric arc to enter the circuit breaker of arc control device.As Chinese patent CN103762130A discloses a kind of circuit breaker, it static contact component comprising shell and arrange in the enclosure, arc control device, described static contact component comprises fixed contact and a run-on tab, run-on tab comprises the root be electrically connected with fixed contact, away from fixed contact and the head extended in arc control device, with be connected root and head and be coated with the pars intermedia of an arc insulating cover, direction from root to head forms the length direction of run-on tab, described arc insulating cover comprises the first sidepiece and the second sidepiece, first sidepiece and the second sidepiece are along the both sides being arranged in pars intermedia about run-on tab length direction, gap between first sidepiece and the second sidepiece is less than the width of pars intermedia.The needs that arrange of run-on tab additionally take up space, and the complex structure of run-on tab, install not easy yet, corresponding arc insulating cover and structure of contact terminal also need to adjust according to the structure of run-on tab, therefore, although the setting of run-on tab serves the effect impelling electric arc to enter arc control device, extra cost can be increased undoubtedly, reduce production efficiency.
To sum up, how to provide a kind of structure simple and whole electric arc or all electric arc enters arc control device substantially breaker contact system can be impelled to be prior art still unsolved technical barriers.
Summary of the invention
Problem to be solved by this invention is that the baffle plate of existing contact system only plays the effect stoping electric arc to move to moving contact both sides and arc control device in the other direction, but cannot play and accelerate the effect that electric arc enters arc control device, thus cause electric arc to exist can not entering arc control device in time and cause circuit breaker can not the problem of normal disjunction, thus provide a kind of baffle plate that electric arc can either be stoped to moving contact both sides and arc control device motion in the other direction, can play again and accelerate the contact system with automatic arc-blowing function that electric arc enters arc control device.
To achieve these goals, the present invention adopts following technical scheme:
A kind of contact system with automatic arc-blowing function, comprise contact support and be arranged on and contact support can together rotate the moving contact of setting with contact support, described moving contact has most large opening when separating brake rotates, also comprise the baffle plate being arranged on described moving contact rotatably and being suitable for contacting on the front end of fixed contact, and apply the elastic biasing arrangement with moving contact separating brake direction of rotation direction biasing force to described baffle plate, described baffle plate has for stoping electric arc to the biside plate of described moving contact two lateral movement, and to be connected to described in two between side plate, face the arc blow-out plate of described arc control device, described baffle plate has the first state with described moving contact unitary rotation, and under effect of inertia, overcome the active force of described elastic biasing arrangement when described moving contact turns to most large opening and the second state being rotated further and then driving arc blow-out plate to blow described electric arc to move to arc control device direction along former direction, and under described elastic biasing arrangement drives, after turning to maximum position of rotation along former direction, rotate backward the third state of reset.
Described arc blow-out plate is constructed to the arc of opening towards described arc control device direction.
The curved angle of described arc is not more than 180 degree.
Described arc blow-out plate is constructed to surface plate.
Side plate described in two lays respectively at the outside of described moving contact, and the slot to make way rotated through for side plate described in two is left in the outside of described moving contact.
Described slot to make way is molded over the both sides that described contact is supported.
Described moving contact comprises several moving contact sheets be arranged in parallel, and to two clamping plate that axial outermost moving contact sheet clamps, described moving contact sheet and described clamping plate are provided with the first axis hole, clamping plate and moving contact sheet connect as one through described first axis hole by rotating shaft, described rotating shaft two ends are provided with boss, and described boss is rotatably plugged in the second axis hole of taking shape on side plate described in two.
Described elastic biasing arrangement is the torsion spring being set in described rotating shaft one or both ends, described torsion spring has long pin and extends the short pin extended from described long pin and towards the direction contrary with described long pin, described short pin is insert molded in the installing hole on described clamping plate, described long pin snap in be molded over described baffle interior both sides positive stop lug boss on.
Also comprise the first position limiting structure and the second position limiting structure, described first position limiting structure is used for limiting described baffle plate rotation maximum distance in the second condition, and described second position limiting structure is used for limiting the rotation maximum distance of described baffle plate under the described third state.
Described first position limiting structure comprises the kidney-shaped spacing hole being molded over described baffle plate both sides and the screw be fixed on through described kidney-shaped spacing hole on clamping plate, and described baffle plate reaches the rotation maximum distance under the second state when the top of kidney-shaped spacing hole and described screws contact.
Described second position limiting structure comprises the hypotenuse that takes shape in described clamping plate bottom and takes shape in below arc blow-out plate, the lower retaining wall be against on described hypotenuse, and described baffle plate reaches the rotation maximum distance under the third state when lower retaining wall offsets described hypotenuse.
Technique scheme of the present invention has the following advantages compared to existing technology:
Baffle plate of the present invention is arranged on moving contact rotationally and is suitable for contacting on the front end of fixed contact, baffle plate is provided with arc blow-out plate, after moving contact separating brake turns to most large opening, the relatively described moving contact of baffle plate is rotated further along former direction, set arc blow-out plate action produces blows power, strengthen air-blowing effect, impel electric arc to move to arc control device fast, improve contact system short circuit breaking capacity; Contact system structure of the present invention is simple, reliable operation.
Accompanying drawing explanation
In order to make the content of invention more easily be clearly understood, below in conjunction with accompanying drawing, the present invention is further detailed explanation, wherein,
Fig. 1 is the installation diagram that the present invention has the contact system of automatic arc-blowing function, and wherein baffle plate only shows a half structure;
Fig. 2 is the exploded view that the present invention has the contact system of automatic arc-blowing function;
Fig. 3 is the state diagram that the present invention has the contact system of automatic arc-blowing function, and wherein baffle plate is in the first state or the third state;
Fig. 4 is the state diagram that the present invention has the contact system of automatic arc-blowing function, and wherein baffle plate is in the second state;
Fig. 5 is the three-dimensional structure diagram that the present invention has the baffle plate of the contact system of automatic arc-blowing function;
Fig. 6 is the baffle plate three-dimensional structure diagram looked in the contrary visual angle of Fig. 5;
Fig. 7 is the installation diagram after contact system that the present invention has an automatic arc-blowing function saves baffle plate;
Fig. 8 is the three-dimensional structure diagram that the present invention has the rotating shaft of the contact system of automatic arc-blowing function;
Fig. 9 is the front view that the present invention has the clamping plate of the contact system of automatic arc-blowing function;
Figure 10 is the longitudinal sectional view that the present invention has the contact system of automatic arc-blowing function;
Figure 11 is the three-dimensional structure diagram that the present invention has the elastic biasing arrangement of the contact system of automatic arc-blowing function;
Figure 12 is that the present invention has the elastic biasing arrangement of the contact system of automatic arc-blowing function and the assembly figure of clamping plate.
Description of reference numerals
1-baffle plate, 101-arc blow-out plate, 102-positive stop lug boss, 103-side plate, 104-second axis hole, 105-kidney-shaped spacing hole, 106-reinforcement, retaining wall under 107-, 2-contact is supported, 201-slot to make way, 3-moving contact, 301-first axis hole, 4-rotating shaft, 401-boss, 5-clamping plate, 501-installing hole, 502-hypotenuse, 6-screw, 7-torsion spring, the long pin of 701-, the short pin of 702-.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
As shown in Figure 1, Figure 2 with shown in Fig. 5, the present embodiment provides a kind of contact system with automatic arc-blowing function, is suitable for being applied in having in the circuit breaker of arc control device, such as low-voltage circuit breaker, frame-type circuit breaker etc.The contact system of the present embodiment is suitable for the below being arranged on arc control device, described contact system comprises contact support 2 and is arranged on the moving contact 32 can being supported together to rotate setting with contact in contact support 2, and described moving contact 3 has most large opening when separating brake rotates.
The contact system of the present embodiment also comprises the baffle plate being arranged on described moving contact 3 rotatably and being suitable for contacting on the front end of fixed contact, and applies the elastic biasing arrangement with moving contact 3 separating brake direction of rotation direction biasing force to described baffle plate 1; Described baffle plate 1 has the biside plate 103 that the electric arc for stoping described moving contact 3 to produce when separating brake moves to direction, described moving contact 3 both sides, and to be connected to described in two between side plate 103, to face the arc blow-out plate 101 of described arc control device; Described baffle plate 1 has the first state with described moving contact 3 unitary rotation, and under effect of inertia, overcome the active force of described elastic biasing arrangement and the second state of being rotated further and then driving arc blow-out plate 101 to blow described electric arc to move to arc control device direction along former direction when described moving contact 3 turns to most large opening, and under elastic biasing arrangement drives, after turning to maximum position of rotation along former direction, rotate backward the third state of reset.
During work, as shown in Figure 3 and Figure 4, when described moving contact 3 separating brake rotates, moving contact 3 and fixed contact disengage, disengage and produce electric arc instantaneously, described moving contact 3 drives described baffle plate 1 one to rotate (now described baffle plate 1 is in described first state) towards away from described fixed contact direction, be obstructed after described moving contact 3 turns to certain position and stop operating, namely described moving contact 3 turns to its most large opening, now described baffle plate overcomes the active force of described elastic biasing arrangement and is rotated further along former direction under effect of inertia, and then drive arc blow-out plate 101 to blow described electric arc to arc control device direction motion (now described baffle plate 1 is in the second state), arc blow-out plate blows electric arc and accelerates to move to described arc control device, play the effect impelling electric arc to enter arc control device, thus make the electric arc produced during moving contact 3 separating brake all or substantially all enter arc control device, ensure that the normal disjunction of circuit breaker.When described baffle plate overcomes after described elastic biasing arrangement turns to maximum position of rotation along former direction under effect of inertia, rotate backward until reset (now described baffle plate 1 is in the third state) under described elastic biasing arrangement drives.
Described arc blow-out plate 101 towards described arc control device be arranged so that can play the effect that " going for a drive " wind herein refers to have the air of electric arc when rotating relative to described moving contact 3, thus promote electric arc and enter arc control device.Based on putting before this, the structure of described arc blow-out plate 101 can be varied, and as in the present embodiment, as shown in Figure 2, described arc blow-out plate 101 is constructed to the arc of opening towards described arc control device direction; Further, the curved angle of described arc is not more than 180 degree, is excellent with 45 degree.Cambered design make arc blow-out plate 101 rotate time blowout " wind " more concentrated, do not disperse.Strengthen arc blow-out effect.
But described arc blow-out plate 101 is not limited to cambered design, in other embodiments, described arc blow-out plate 101 can also be constructed to surface plate, although " wind " opposing arcuate plate of described surface plate blowout when rotating is looser, its structure is simpler, and production cost is lower.
In the present embodiment, as shown in Figure 2 and Figure 7, described baffle plate 1 two described in side plate 103 lay respectively at the outside of described moving contact 3, the slot to make way 201 rotated through for side plate 103 described in two is left in the outside of described moving contact 3.
Particularly, in the present embodiment, described slot to make way 201 is molded over the both sides that described contact supports 2.
The contact system of the present embodiment is applicable to frame circuit breaker, as shown in Figure 1, Figure 2, shown in Fig. 7, Fig. 8, Fig. 9 and Figure 10, described moving contact 3 comprises several moving contact sheets be arranged in parallel, and to two clamping plate 5 that axial outermost moving contact sheet clamps, described moving contact sheet and described clamping plate are provided with the first axis hole 301, clamping plate and moving contact sheet connect as one through described first axis hole 301 by rotating shaft 4, described rotating shaft 4 two ends are provided with boss, and described boss is rotatably plugged in the second axis hole 104 of taking shape on side plate 103 described in two.
As is illustrated by figs. 11 and 12, described elastic biasing arrangement is the torsion spring 7 being set in described rotating shaft 4 one or both ends, described torsion spring 7 has long pin 701 and short pin 702, described short pin 702 is suitable for inserting in the shaping installing hole 501 of described clamping plate 5, and described long pin 701 is suitable for the positive stop lug boss place snapping in the described inner both sides of baffle plate 1.Described baffle plate 1 continues to press described long pin 701 when separating brake rotation direction is rotated relative to described moving contact 3, described torsion spring 7 compressed energy-storage; When described torsion spring 7 releases energy, its long pin 701 promotes described baffle plate 1 and rotates reset.
As shown in Figure 3 and Figure 4, described contact system also comprises the first position limiting structure and the second position limiting structure, described first position limiting structure is used for limiting described baffle plate 1 rotation maximum distance in the second condition, and described second position limiting structure is used for limiting the rotation maximum distance of described baffle plate 1 under the described third state.
Described first position limiting structure comprises the kidney-shaped spacing hole 105 that is molded over described baffle plate 1 both sides and is fixed on through described kidney-shaped spacing hole 105 screw 6 that described contact supports on the clamping plate 5 of 2 both sides, and described baffle plate 1 reaches the rotation maximum distance under the second state when the top of its kidney-shaped spacing hole 105 and described screws contact.
Described second position limiting structure comprise the hypotenuse 502 that takes shape in described clamping plate 5 bottom and take shape on described baffle plate 1 below arc blow-out plate 101, be suitable for being against the lower retaining wall 107 on described hypotenuse 502, described baffle plate 1 reaches the rotation maximum distance under the third state when its lower retaining wall 107 offsets described hypotenuse 502.
As shown in Figure 6, several reinforcements 106 are provided with between described arc blow-out plate 101 and retaining wall.
According to structure described above, assembling and the operation principle of the contact system of the present embodiment is described below with reference to the accompanying drawings:
Contact system is made up of baffle plate 1, contact support 2, contact assembly, rotating shaft 4, clamping plate 55, screw, torsion spring 7.
First rotating shaft 4 is penetrated successively in the first axis hole 301 that contact assembly is formed by the through hole of each moving contact 3; Subsequently torsion spring 7 is enclosed within the two ends of rotating shaft 4, then the overall contact that loads supports 2, and both sides clamping plate 5 are screwed to be supported on 2 at contact, and the short pin 702 of torsion spring 7 inserts installing hole 501 set on clamping plate 5; Baffle plate 1 both sides are provided with axis hole and snap in rotating shaft 4 two ends boss, biside plate 103 stretches into contact and supports in slot to make way 201 mouthfuls set by 2, the long pin 701 of torsion spring 7 slips into positive stop lug boss place, baffle plate 1 inner both sides, screw is passed spacing hole set by baffle plate 1, be fastened on contact support 2 both sides, complete contact system assembling, and now baffle plate 1 elastic device and effect under, be close to clamping plate 5 hypotenuse 502 place, state as shown in Figure 2.
A kind of contact system with automatic arc-blowing function of the present invention, baffle plate 1 is provided with arc blow-out plate 101, after breaker open operation moving contact 3 arrives most large opening, baffle plate 1 around the shaft 4 flexible bias pressures overcoming torsion spring 7 is rotated further, set arc blow-out plate 101 action produces thrust, strengthens air-blowing effect, impels electric arc to move to arc control device fast, as figure, set by screw and baffle plate 1, spacing hole limits the maximum rotation stroke of baffle plate 1.Described baffle plate 1 rotates backward under the effect of torsion spring 7 flexible bias pressure, resets when its lower retaining wall 107 is against hypotenuse 502 place of clamping plate 5.
Obviously, above-described embodiment is only for clearly example being described, the restriction not to execution mode.Concerning those of ordinary skill in the field, also can make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.And thus the apparent change of extending out or variation be still among the protection range of the invention.
Claims (11)
1. one kind has the contact system of automatic arc-blowing function, comprise contact support (2) and be arranged on and contact support (2) can together rotate the moving contact (3) of setting with contact support (2), described moving contact (3) has most large opening when separating brake rotates, it is characterized in that: also comprise the baffle plate (1) being arranged on described moving contact (3) rotatably and being suitable for contacting on the front end of fixed contact, and apply the elastic biasing arrangement with moving contact (3) separating brake direction of rotation direction biasing force to described baffle plate (1), described baffle plate (1) has for stoping electric arc to the biside plate (103) of described moving contact (3) two lateral movement, and be connected between side plate described in two (103), face the arc blow-out plate (101) of arc control device, described baffle plate (1) has the first state with described moving contact (3) unitary rotation, and under effect of inertia, overcome the active force of described elastic biasing arrangement when described moving contact (3) turns to most large opening and the second state being rotated further and then driving arc blow-out plate (101) to blow described electric arc to move to arc control device direction along former direction, and under described elastic biasing arrangement drives, after turning to maximum position of rotation along former direction, rotate backward the third state of reset.
2. contact system according to claim 1, is characterized in that: described arc blow-out plate (101) is constructed to the arc of opening towards described arc control device direction.
3. contact system according to claim 2, is characterized in that: the curved angle of described arc is not more than 180 degree.
4. contact system according to claim 1, is characterized in that: described arc blow-out plate (101) is constructed to surface plate.
5. the contact system according to any one of claim 1-4, it is characterized in that: side plate described in two (103) lays respectively at the outside of described moving contact (3), the slot to make way (201) rotated through for side plate (103) described in two is left in the outside of described moving contact (3).
6. contact system according to claim 5, is characterized in that: described slot to make way (201) is molded over the both sides of described contact support (2).
7. the contact system according to any one of claim 1-4, it is characterized in that: described moving contact (3) comprises several moving contact sheets be arranged in parallel, and to two clamping plate (5) that axial outermost moving contact sheet clamps, described moving contact sheet and described clamping plate are provided with the first axis hole (301), clamping plate and moving contact sheet connect as one through described first axis hole (301) by rotating shaft (4), described rotating shaft (4) two ends are provided with boss, described boss is rotatably plugged in the second axis hole (104) of taking shape on side plate described in two (103).
8. contact system according to claim 7, it is characterized in that: described elastic biasing arrangement is for being set in the torsion spring (7) of described rotating shaft (4) one or both ends, described torsion spring (7) has long pin (701) and extends the short pin (702) extended from described long pin (701) and towards the direction contrary with described long pin (701), described short pin (702) is insert molded in the installing hole (501) on described clamping plate (5), described long pin (701) snaps in and is molded on the positive stop lug boss (102) of described baffle plate (1) inner both sides.
9. the contact system according to any one of claim 1-4, it is characterized in that: also comprise the first position limiting structure and the second position limiting structure, described first position limiting structure is used for limiting described baffle plate (1) rotation maximum distance in the second condition, and described second position limiting structure is used for limiting the rotation maximum distance of described baffle plate (1) under the described third state.
10. contact system according to claim 9, it is characterized in that: described first position limiting structure comprises the kidney-shaped spacing hole (105) being molded over described baffle plate (1) both sides and the screw (6) be fixed on through described kidney-shaped spacing hole (105) on clamping plate (5), and described baffle plate (1) reaches the rotation maximum distance under the second state when the top of kidney-shaped spacing hole (105) contacts with described screw (6).
11. contact systems according to claim 10, it is characterized in that: described second position limiting structure comprise the hypotenuse (502) that takes shape in described clamping plate (5) bottom and take shape in arc blow-out plate (101) below, the lower retaining wall (107) be against on described hypotenuse (502), described baffle plate (1) reaches the rotation maximum distance under the third state when lower retaining wall (107) offsets described hypotenuse (502).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410712829.4A CN104409248B (en) | 2014-11-28 | 2014-11-28 | A kind of contact system with automatic arc-blowing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410712829.4A CN104409248B (en) | 2014-11-28 | 2014-11-28 | A kind of contact system with automatic arc-blowing function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104409248A CN104409248A (en) | 2015-03-11 |
| CN104409248B true CN104409248B (en) | 2016-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410712829.4A Active CN104409248B (en) | 2014-11-28 | 2014-11-28 | A kind of contact system with automatic arc-blowing function |
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| Country | Link |
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| CN (1) | CN104409248B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4419642B2 (en) * | 2004-03-30 | 2010-02-24 | 富士電機機器制御株式会社 | Circuit breaker arc extinguishing device |
| US8415580B2 (en) * | 2011-06-30 | 2013-04-09 | Eaton Corporation | Carrier link insulator for a circuit breaker |
| CN202816838U (en) * | 2012-07-31 | 2013-03-20 | 上海电科电器科技有限公司 | Movable contact of low-voltage circuit breaker |
| CN103762130B (en) * | 2013-12-27 | 2017-11-28 | 常熟开关制造有限公司(原常熟开关厂） | Breaker |
| CN204257451U (en) * | 2014-11-28 | 2015-04-08 | 德力西电气有限公司 | A kind of contact system with automatic arc-blowing function |
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2014
- 2014-11-28 CN CN201410712829.4A patent/CN104409248B/en active Active
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| CN104409248A (en) | 2015-03-11 |
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