CN106677695A - Ladder joint - Google Patents
Ladder joint Download PDFInfo
- Publication number
- CN106677695A CN106677695A CN201710026893.0A CN201710026893A CN106677695A CN 106677695 A CN106677695 A CN 106677695A CN 201710026893 A CN201710026893 A CN 201710026893A CN 106677695 A CN106677695 A CN 106677695A
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- CN
- China
- Prior art keywords
- locking teeth
- ladder
- outer box
- joint
- locking
- 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
- 230000009471 action Effects 0.000 claims description 7
- 210000000515 tooth Anatomy 0.000 description 23
- 238000012856 packing Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06C—LADDERS
- E06C7/00—Component parts, supporting parts, or accessories
- E06C7/50—Joints or other connecting parts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ladders (AREA)
Abstract
The invention provides a ladder joint used for connecting a first ladder piece and a second ladder piece in a hinged mode. The ladder joint comprises first locking teeth and second locking teeth, wherein the first locking teeth are fixedly connected with the first ladder piece, and the second locking teeth are rotatably connected with the second ladder piece. The first ladder piece and the second ladder piece are rotatably connected through a first hinge shaft. The first locking teeth and the second locking teeth are engaged with each other and locked unidirectionally. By adoption of the ladder joint, diversified variation of angular adjustment and continuity of adjustment can be achieved, and therefore, the ladder joint can adapt to variation of the opening angle of a folding ladder.
Description
Technical field
The present invention relates to a kind of joint for connecting ladder, i.e., a kind of terraced joint.
Background technology
Existing folding ladder, can mutually rotate between two panels ladder, and shape has a certain degree.But existing folding ladder
Connection joint between two panels ladder is positioned only by the mode of simple snaps into position, only sets several buckles, and one
As be 3, so, the adjustment angle between two panels ladder also only has a limited number of, and typically namely 3, adjustment is inconvenient,
Affect the use of ladder.
The content of the invention
The present invention provides a kind of terraced joint, to solve existing ladder angle adjustment inconvenience, discontinuous problem.
For this purpose, the present invention proposes a kind of terraced joint, for first piece ladder and second ladder of being articulated and connected, the ladder is closed
Section includes：
First locking teeth, is fixedly connected with the first piece ladder；
Second locking teeth, rotates with second ladder and is connected；
First piece ladder and second ladder rotate connection by the first hinge；
First locking teeth and second locking teeth are intermeshed, and first locking teeth and second lock
Tight tooth is one-way locking.
Further, first locking teeth is semi-circular gear, the axle center of the semi-circular gear and the described first hinge
With one heart, second locking teeth has two ends, respectively the second end of the first end of the second locking teeth and the second locking teeth, institute to axle
State the second locking teeth and also there is medial surface and lateral surface, the first end of second locking teeth is with second ladder by the second hinge
Axle is articulated and connected, and the semi-circular gear is located between first hinge and second hinge；Second locking teeth
Compress the post spring of return action on second end, the medial surface of second locking teeth is circular arc, second locking teeth
The tooth engaged that is meshed with semi-circular gear of medial surface, the post spring is pressed on the institute at the second end of second locking teeth
State on lateral surface.
Further, the terraced joint also includes：The first outer box being coated on outside first locking teeth, and cladding
The second outer box outside second locking teeth, first outer box are cut with scissors with second outer box by first hinge
Connect；
First locking teeth is fixedly connected in first outer box, and second locking teeth passes through second hinge
It is hingedly connected in second outer box；First locking teeth is fixed with the first piece ladder by first outer box and connected
Connect；Second locking teeth is connected by being rotatably connected in second outer box with second ladder, outside described second
The spring base for supporting the post spring is additionally provided with box.
Further, the torsion spring for replying second locking teeth is arranged with second hinge.
Further, the second end of first end of first outer box with the first outer box and the first outer box, described second
Outer box have the first end of the second outer box and the second end of the second outer box, and the of the first end of first outer box and the second outer box
One end is hinged；Second end of first outer box connects the first piece ladder, and the second end of second outer box is fixedly connected
Second ladder；
The terraced joint also includes：Bracing wire, connects the second end of second locking teeth, and the bracing wire is located at described second
In outer box and stretch out the second end of second outer box.
Further, the second end of second locking teeth is connected during the bracing wire is by being located in the post spring.
Further, the guider being oriented to the bracing wire is additionally provided with second outer box.
Further, the semi-circular gear is provided with 6 to 90 teeth.
Further, second locking teeth is tooth bar, and the number of teeth of the tooth bar is 3 to 6.
Further, the semi-circular gear is fixed in first outer box by plural rivet.
Further, first outer box are two-piece unit formula structure with second outer box.
The present invention adopts wheel gear locking, and two locking teeths are connected respectively with two panels ladder, it is possible to realizing adjustment angle
Multifarious change and adjustment it is continuous, it is thus possible to adapt to the change of folding ladder opening angle.
Further, the present invention realizes auto lock using post spring, it is to avoid traditional locking needs the buckle people of two panels ladder
The operation of work alignment, reduces the danger that ladder opens.Further, the present invention replys second and locks jointly using post spring and torsion spring
Tooth, one is to define dual fail-safe, and two are the reduction of the abrasion of post spring and torsion spring, increased the service life in whole joint.
Further, the present invention controls the position of the second locking teeth using bracing wire, so as to control the locking between two locking teeths,
As such, it is possible to need to climb to the joint of ladder, the i.e. junction of ladder peak to lock not necessarily like traditional snap lock
Or unblock buckle, the present invention can be in the bottom stear drawing line of ladder so as to realizing locking or unlock two panels ladder, it is to avoid often
It is secondary to fold or need to climb to the operation on ladder summit again when packing up ladder, accident odds is reduced, safety is increased,
It is also convenient for quickly packing up.
Description of the drawings
Fig. 1 is the external structure schematic diagram in the terraced joint according to the embodiment of the present invention；
Fig. 2 is the internal structure schematic diagram in the terraced joint according to the embodiment of the present invention；
Fig. 3 is the attachment structure schematic diagram in the terraced joint according to the embodiment of the present invention and ladder.
Drawing reference numeral explanation：
10th, terraced joint 11,12, second ladder of first piece ladder
1st, the first locking teeth 2, the second locking teeth 3, the first outer box 4, the second outer box 5, the first hinge 6, bracing wire 7,
Second hinge 8, spring base 9, post spring 20, Wire channel in building 30, rivet 30, rivet 32, the second end 42 of the first outer box,
The guider of second end 45 of two outer box
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and effect, now control illustrates this
Bright specific embodiment.
As shown in Figure 1, Figure 2 and Figure 3, the present invention proposes a kind of terraced joint 10, for the He of first piece ladder 11 that is articulated and connected
Second ladder 12, as shown in figure 3, every ladder has two parallel vertical supporting bars for being supported on ground and is connected to
The different horizontal stroke ladder of multiple height between two parallel vertical supporting bars, people is climbed by horizontal ladder；
As shown in Figure 1 and Figure 2, the terraced joint 10 includes：
First locking teeth 1, is fixedly connected with the first piece ladder 11；
Second locking teeth 2, rotates with second ladder 12 and is connected, i.e., the second locking teeth 2 can be relative to second
Ladder 12 is rotated；
First piece ladder 11 and second ladder 12 rotate connection by the first hinge 5；
First locking teeth 1 and second locking teeth 2 are intermeshed, and first locking teeth 1 and described
Two locking teeths 2 are one-way locking, for example, when first piece ladder 11 and second ladder 12 mutually close up, the first locking teeth 1 and institute
Stating the second locking teeth 2 can form gear drive, and first piece ladder 11 and second ladder 12 are located remotely from each other, when angle becomes big,
First locking teeth 1 and second locking teeth 2 are locked, in case ladder is outwards sliped off in use.
Further, first locking teeth 1 is semi-circular gear, because the maximum opening angle of ladder is 180 degree, institute
With, the maximum opening angle of ladder is just sufficient for using semi-circular gear, so as to reduce cost, alleviate weight, space
It is more compact；The axle center of the semi-circular gear 1 is concentric with first hinge 5, and second locking teeth 2 has two ends, respectively
Second end of first end and the second locking teeth for the second locking teeth, second locking teeth also has medial surface and lateral surface,
The first end of second locking teeth is articulated and connected with second ladder by the second hinge 7, and the semi-circular gear 1 is located at institute
State between the first hinge 5 and second hinge 7；The post spring of return action is compressed on second end of second locking teeth
9, the medial surface of second locking teeth 2 is the gear or coaxial with the first hinge of circular arc, the circular arc and the first locking teeth,
So that the second locking teeth 2 is meshed with the first locking teeth, the medial surface of second locking teeth is provided with semi-circular gear and mutually nibbles
The tooth engaged of conjunction, i.e. the second locking teeth 2 are the tooth of multiple straight lines arrangement, and the post spring 9 is pressed on the of second locking teeth
On the lateral surface at two ends, to realize one-way locking.
In the case of the External force interference of nobody, post spring (cylindrical spring) 9 causes the automatic impaction of the second locking teeth 2 the
In one locking teeth 1, when the second locking teeth 2 is inwardly rotated relative to the first locking teeth 1, the second locking teeth 2 is subject to inside acting on
Power, i.e. the second locking teeth 2 are subject to the power of the first extreme direction from the second end of the second locking teeth to the second locking teeth, now, by
It is fixing end in the first end of the second locking teeth, the first end of the second locking teeth is immovable, so as to prevent the phase of the second locking teeth 2
First locking teeth 1 is inwardly rotated, so as to prevent two panels ladder from opening；But for relative first locking teeth 1 of the second locking teeth 2 to
Outer rotation, now, the second locking teeth 2 is subject to the outside thrust of the first locking teeth 1, and the second end of the second locking teeth is on-fixed
End, because the second locking teeth 2 is subject to the outside thrust of the first locking teeth 1 more than the return action power of post spring 9, though there is post spring 9
Return action power, but do not affect the second locking teeth 2 to be turned out relative to the first locking teeth 1 or mobile, thus, the second locking teeth 2
The pressure and the second locking teeth 2 being pressed in the first locking teeth 1 relatively rotates not contradiction, thus the second locking teeth 2 turns relatively
Dynamic unaffected, i.e., when two panels ladder closes up, joint does not affect packing up or closing up for ladder.
Further, the terraced joint 10 also includes：The first outer box 3 being coated on outside first locking teeth 1, and
The second outer box 4 being coated on outside second locking teeth 2, first outer box 3 pass through described first with second outer box 4
Hinge 5 is hinged；First outer box 3 can be relatively rotated with second outer box 4, different angles be formed, so as to form ladder
Different subtended angles；
First outer box 3 are fixedly connected with first piece ladder 11, and the second ladder 12 of outer box 4 second is fixedly connected；
First locking teeth 1 is fixedly connected in first outer box 3, and second locking teeth 2 passes through described second
Hinge 5 is hingedly connected in second outer box 4；First locking teeth 1 is by first outer box 3 and first piece ladder
Son 11 is fixedly connected；Second locking teeth 2 is rotatably connected in second outer box and described second by the second hinge 7
Ladder 12 connects, and the spring base 8 for supporting the post spring 9 is additionally provided with second outer box 4.Outside first outer box 3 and described second
Box 4 acts primarily as the effect for closing off and protecting corresponding locking teeth, and provides fixed for corresponding locking teeth and support；Can be with
Support is provided for post spring 9.
Further, the torsion spring that being arranged with second hinge 7 replys second locking teeth 2 (does not show in figure
Go out).Torsion spring also functions to return action, can make two locking teeth auto locks in the case of the External force interference of nobody.Its
In, the second hinge 7 is arranged in the second outer box 4, and the bottom of the second hinge 7 is stretched out the second locking teeth 2 and exposes the second outer box
4, the second locking teeth 2 is stretched out at the top of the second hinge 7, and torsion spring is respectively sleeved at the top of the bottom of the second hinge 7 and the second hinge 7
Portion, that is, be respectively sleeved at the two ends of the second hinge 7, on the one hand can play return action, on the other hand, moreover it is possible to play to second
Hinge 7 carries out the effect of axially position and buffering, plays good counterbalance effect.
Further, first outer box 3 have the first end of the first outer box and the second end 32 of the first outer box, and described the
Two outer box 4 have the first end of the second outer box and the second end 42 of the second outer box, outside the first end and second of first outer box
The first end of box is hinged；Second end 32 of first outer box connects the first piece ladder 11, and the second of second outer box
End 42 is fixedly connected second ladder 12；
The terraced joint 10 also includes：Bracing wire 6, connects the second end of second locking teeth 2, and the bracing wire 6 is located at institute
The second end 42 of second outer box is stated in the second outer box 4 and stretches out, the second end of the second locking teeth 2 is locked with the first locking teeth 1
After tight, bracing wire can overcome the pressure of torsion spring, pull the second end of the second locking teeth 2, and the second end for making the second locking teeth 2 departs from
With the contact of the first locking teeth 1, so as to release the locking with the first locking teeth 1, as such, it is possible to open ladder；Second locking teeth 2
The locking of the second end and the first locking teeth 1 after, when exert a force to bracing wire, the second end of the second locking teeth 2 and the first locking teeth 1
Occlusion is then kept, locking is maintained, now, two panels ladder outwards can not open, but two panels ladder inwardly then can be packed up；Due to
Second end 42 of two outer box is fixedly connected second ladder 12, so equivalent to the control extended to the second locking teeth 2
Length, can extend at second ladder from locking teeth, reduce control height.Second locking teeth is controlled using bracing wire
Position, so as to control the locking between two locking teeths, as such, it is possible to need to climb to ladder not necessarily like traditional snap lock
Joint, i.e. locking or unlock buckle, the present invention can be in the bottom stear drawing line of ladder for the junction of ladder peak
So as to realizing locking or unlock two panels ladder, it is to avoid each folding needs to climb to the behaviour on ladder summit again when packing up ladder
Make, reduce accident odds, increased safety, be also convenient for quickly packing up.
Further, the second end of second locking teeth 2 is connected during the bracing wire 6 is by being located in the post spring 9, this
Sample, arranges ingenious, and the problem of guy winding miscellaneous part will not occur.Second end of the second locking teeth 2 can be provided with Wire channel in building
20, so that bracing wire is fixed to the second end of the second locking teeth 2.
Further, the guider 45 being oriented to the bracing wire 6 is additionally provided with second outer box 4, drawing can be adjusted
The direction of line 6.Guider 45 is, for example, lead column.
Further, the semi-circular gear is provided with 6 to 90 teeth, for example, 20 to 60 equally distributed teeth, so
Fine-tuning for the continuous multi-angle in the range of 180 degree can be realized, the various needs that ladder opens are disclosure satisfy that.
Further, second locking teeth 2 is the tooth bar with annular medial surface, (tooth engaged) tooth of the tooth bar
Number is 3 to 6.Because the first locking teeth 1 has multiple teeth, 180 degree rotation can be carried out, thus, the second locking teeth 2 only needs several
Individual tooth is just enough, and the length of the second locking teeth 2 can accomplish less, and it is less that the number of teeth can be done, and convenient manufacture is processed and installed, and is subtracted
Light ladder quality.
Further, the semi-circular gear is fixed in first outer box 3 by plural rivet 30, example
Such as, fixed with 3 rivets, so, the fixing-stable of the first locking teeth 1 will not be rotated relative to the first outer box 3.
Further, first outer box 3 are two-piece unit formula structure with second outer box 4, main to protect and seal
The upper and lower ends of the first locking teeth 1 and second locking teeth 2 are closed, the first outer box 3 are with second outer box 4 in the first locking teeth
1 and second locking teeth 2 intermeshing at be provided with opening, not affect the engagement and rotation of two locking teeths, the first outer box 3
Upper and lower two halves are divided into second outer box 4, to re-form envelope after installing the first locking teeth 1 and second locking teeth 2
Close.
The terraced joint of the present invention can realize that the stable locking of folding ladder and multi-angle are accurately adjusted.The present invention adopts bracing wire
Control locking, it may not be necessary to as traditional snap lock needs to climb to the joint of ladder, the i.e. junction of ladder peak, comes
Locking unlocks buckle, and the present invention can be in the bottom stear drawing line of ladder so as to realizing locking or unlocking two panels ladder, it is to avoid
Each folding needs to climb to the operation on ladder summit again when packing up ladder, reduces accident odds, increased peace
Quan Xing, is also convenient for quickly packing up.
Schematically specific embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.For this
Each ingredient of invention can be mutually combined under conditions of not conflicting, any those skilled in the art, without departing from this
Done equivalent variations and modification, all should belong to the scope of protection of the invention on the premise of the design of invention and principle.
Claims (10)
1. a kind of terraced joint, for first piece ladder and second ladder of being articulated and connected, it is characterised in that the terraced joint bag
Include：
First locking teeth, is fixedly connected with the first piece ladder；
Second locking teeth, rotates with second ladder and is connected；
First piece ladder and second ladder rotate connection by the first hinge；
First locking teeth and second locking teeth are intermeshed, and first locking teeth and second locking teeth
For one-way locking.
2. ladder joint as claimed in claim 1, it is characterised in that first locking teeth is semi-circular gear, the semi-ring
The axle center of shape gear is concentric with first hinge, and second locking teeth has two ends, respectively the first of the second locking teeth
End and the second end of the second locking teeth, second locking teeth also has medial surface and a lateral surface, and the of second locking teeth
One end is articulated and connected with second ladder by the second hinge, and the semi-circular gear is located at first hinge and described second
Between hinge；The post spring of return action, the inner side of second locking teeth are compressed on second end of second locking teeth
Face is circular arc, and the medial surface of second locking teeth is provided with the tooth engaged being meshed with semi-circular gear, and the post spring is supported
It is pressed on the lateral surface at the second end of second locking teeth.
3. ladder joint as claimed in claim 2, it is characterised in that the terraced joint also includes：It is coated on first locking
The first outer box outside tooth, and the second outer box being coated on outside second locking teeth, first outer box and described
Two outer box are hinged by first hinge；
First locking teeth is fixedly connected in first outer box, and second locking teeth is hinged by second hinge
It is connected in second outer box；First locking teeth is fixedly connected by first outer box with the first piece ladder；
Second locking teeth is connected by being rotatably connected in second outer box with second ladder, in second outer box
It is additionally provided with the spring base for supporting the post spring.
4. ladder joint as claimed in claim 2, it is characterised in that being arranged with second hinge makes second locking teeth
The torsion spring of reply.
5. ladder joint as claimed in claim 3, it is characterised in that first outer box have the first end of the first outer box and the
Second end of one outer box, second outer box have the first end of the second outer box and the second end of the second outer box, outside described first
The first end of box is hinged with the first end of the second outer box；Second end of first outer box connects the first piece ladder, described
Second end of the second outer box is fixedly connected second ladder；
The terraced joint also includes：Bracing wire, connects the second end of second locking teeth, and the bracing wire is located at second outer box
In and stretch out the second end of second outer box.
6. ladder joint as claimed in claim 5, it is characterised in that the bracing wire by being located in the post spring in connection it is described
Second end of the second locking teeth.
7. ladder joint as claimed in claim 5, it is characterised in that be additionally provided with what is be oriented to the bracing wire in second outer box
Guider.
8. ladder joint as claimed in claim 2, it is characterised in that the semi-circular gear is provided with 6 to 90 teeth, described second
Locking teeth is tooth bar, and the number of teeth of the tooth bar is 3 to 6.
9. ladder joint as claimed in claim 3, it is characterised in that the semi-circular gear is fixed by plural rivet
In first outer box.
10. ladder joint as claimed in claim 3, it is characterised in that first outer box are up and down with second outer box
Split-type structural.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026893.0A CN106677695B (en) | 2017-01-15 | 2017-01-15 | Terraced joint |
| PCT/CN2018/072180 WO2018130166A1 (en) | 2017-01-15 | 2018-01-11 | Folding stepladder |
| PCT/CN2018/072183 WO2018130167A1 (en) | 2017-01-15 | 2018-01-11 | Stepladder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710026893.0A CN106677695B (en) | 2017-01-15 | 2017-01-15 | Terraced joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106677695A true CN106677695A (en) | 2017-05-17 |
| CN106677695B CN106677695B (en) | 2018-07-06 |
Family
ID=58858861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710026893.0A Expired - Fee Related CN106677695B (en) | 2017-01-15 | 2017-01-15 | Terraced joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106677695B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107869305A (en) * | 2016-09-26 | 2018-04-03 | 李南仁 | A kind of vehicle-mounted, dress dimension insulation folds ladder device |
| WO2018130166A1 (en) * | 2017-01-15 | 2018-07-19 | 黄崇华 | Folding stepladder |
| CN110319111A (en) * | 2019-08-09 | 2019-10-11 | 福州大学 | A kind of more detent linkages of bolt-type and its working method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1654888A1 (en) * | 1967-07-06 | 1971-02-04 | Wilhelm Bahmueller | Multipurpose foldable ladder |
| CH528006A (en) * | 1969-07-30 | 1972-09-15 | Hoffmann Helmut | Multipurpose foldable ladder |
| US4425983A (en) * | 1981-10-09 | 1984-01-17 | Reinhard Cheyenne A | Folding fire escape ladder |
| CN2161713Y (en) * | 1993-02-15 | 1994-04-13 | 庄清宝 | Structure of folding ladder |
| CN206448766U (en) * | 2017-01-15 | 2017-08-29 | 黄崇华 | Terraced joint |
-
2017
- 2017-01-15 CN CN201710026893.0A patent/CN106677695B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1654888A1 (en) * | 1967-07-06 | 1971-02-04 | Wilhelm Bahmueller | Multipurpose foldable ladder |
| CH528006A (en) * | 1969-07-30 | 1972-09-15 | Hoffmann Helmut | Multipurpose foldable ladder |
| US4425983A (en) * | 1981-10-09 | 1984-01-17 | Reinhard Cheyenne A | Folding fire escape ladder |
| CN2161713Y (en) * | 1993-02-15 | 1994-04-13 | 庄清宝 | Structure of folding ladder |
| CN206448766U (en) * | 2017-01-15 | 2017-08-29 | 黄崇华 | Terraced joint |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107869305A (en) * | 2016-09-26 | 2018-04-03 | 李南仁 | A kind of vehicle-mounted, dress dimension insulation folds ladder device |
| WO2018130166A1 (en) * | 2017-01-15 | 2018-07-19 | 黄崇华 | Folding stepladder |
| CN110319111A (en) * | 2019-08-09 | 2019-10-11 | 福州大学 | A kind of more detent linkages of bolt-type and its working method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106677695B (en) | 2018-07-06 |
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Granted publication date: 20180706 |