CN107387831A - A kind of multiple-directional control valve for petroleum machinery - Google Patents
A kind of multiple-directional control valve for petroleum machinery Download PDFInfo
- Publication number
- CN107387831A CN107387831A CN201710458059.9A CN201710458059A CN107387831A CN 107387831 A CN107387831 A CN 107387831A CN 201710458059 A CN201710458059 A CN 201710458059A CN 107387831 A CN107387831 A CN 107387831A
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- fixedly connected
- plate
- stud
- valve body
- block
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
Abstract
The invention discloses a kind of multiple-directional control valve for petroleum machinery, including reversing valve body, the bottom of the reversing valve body is provided with installing plate, front side and rear side at the top of the installing plate are symmetrically fixedly connected with location-plate, and the front surface of the reversing valve body and the back side are symmetrically fixedly connected with limited block.The present invention is by setting reversing valve body, installing plate, location-plate, limited block, fixture block, slide rail, sliding block, arc block, first stud, first nut, clamping plate, buffer unit, open tubular column, spring, connecting plate, connecting pole, slide bar, sliding sleeve, first locating piece, second locating piece, second stud and the second nut are used cooperatively, solve present reversal valve to be all mounted in plane, the problem of existing reversal valve can not be arranged on cylinder, the multiple-directional control valve for petroleum machinery, possesses the advantages of being easy to user to install, improve the use range of the reversal valve, so as to improve the practicality of the reversal valve.
Description
Technical field
The present invention relates to reversal valve technical field, specially a kind of multiple-directional control valve for petroleum machinery.
Background technology
Reversal valve is to change the break-make relation of oil duct on valve body of being connected to by the relative motion between valve element and valve body
Valve class, multiple directional control valve be by the combination valve that two and above reversal valve are main body, can be with according to different job requirements
The subsidiary valve such as safety overflow valve, check valve and Fill valve in combination, is compared, multiple directional control valve has structure with other kinds of valve
The compact pressure loss is small, and guiding valve moving resistance is little, there is more bit functions, long lifespan, the advantages that being simple to manufacture.
Reversal valve is essential in the composition of crane, and present reversal valve is all mounted in plane, existing
Some reversal valves can not be arranged on cylinder, limited to the use range of reversal valve, it has not been convenient to which user is installed, and is reduced
The practicality of existing reversal valve.
The content of the invention
It is an object of the invention to provide a kind of multiple-directional control valve for petroleum machinery, possesses and is easy to the excellent of user's installation
Point, solve present reversal valve and be all mounted in plane, existing reversal valve can not be arranged on cylinder on the problem of.
To achieve the above object, the present invention provides following technical scheme：A kind of multiple-directional control valve for petroleum machinery, including change
To valve body, the bottom of the reversing valve body is provided with installing plate, and the front side and rear side at the top of the installing plate are symmetrically solid
Surely location-plate is connected with, the front surface of the reversing valve body and the back side are symmetrically fixedly connected with limited block, the location-plate
Top be through to the top of limited block, be fixedly connected with fixture block, the both sides of the reversing valve body at the top of the limited block
Slide rail is fixedly connected with, side of the slide rail away from reversing valve body slidably connects sliding block, and the sliding block is away from slide rail
Side be fixedly connected with arc block, the both sides of the arc block bottom have been fixedly connected with the first stud, first stud
Bottom be through to the bottom of installing plate, the bottom of the installing plate is provided with the first nut, first nut and the first spiral shell
Male screw connects, and side of the slide rail away from reversing valve body is provided with clamping plate, be fixedly connected at the top of the clamping plate
There is buffer unit, the buffer unit includes open tubular column, spring, the spring are fixedly connected with the top of the hollow column wall
Bottom be fixedly connected with connecting plate, the bottom of the connecting plate is fixedly connected with connecting pole, and the bottom of the connecting pole is run through
It is fixedly connected to arc block with clamping plate, the top of the hollow block inwall is symmetrically fixedly connected with slide bar, the connecting plate
Top is provided through sliding sleeve, and the inwall of the sliding sleeve and the outer surface of slide bar are slidably connected, and the bottom of the slide bar is through cunning
The bottom for covering and extending to connecting plate is fixedly connected with the first locating piece, and the both sides of the reversing valve body are symmetrically fixedly connected
There is the second locating piece, the second stud is provided through at the top of second locating piece, the bottom of second stud is through to
The bottom of installing plate, the bottom of the installing plate are provided with the second nut, the second stud and the second nut thread connection.
Preferably, projection has been fixedly connected with the top and bottom of the slide rail, and two projections are close to slide rail side
Cross-sectional area is more than the cross-sectional area at the top and bottom of slide rail.
Preferably, the bottom of the hollow block offers the first opening being used cooperatively with downlink connection post, the clamping plate
Bottom be fixedly connected with non-slip bumps, and clamping plate is circular arc device.
Preferably, the bottom of the installing plate offers the second opening being used cooperatively with the first stud, the installing plate
Bottom offer with the second stud be used cooperatively the 3rd opening.
Preferably, the surface of first stud and the surface of the second stud are provided with external screw thread, first nut
The internal thread being used cooperatively with external screw thread is offered with the inside of the second nut.
Preferably, the cross-sectional area at the top of first locating piece is more than the cross-sectional area of slide bar bottom, and two slide bars
It is symmetrical set on spring.
Preferably, the open tubular column is located at the inside of arc block, and the top of the open tubular column passes through fixture and arc block
It is fixedly connected at the top of inwall, the clamping plate is located at the bottom of arc block.
Preferably, the both sides of the reversing valve body are provided with two draw rings, and the surface of four draw rings is arranged with
Fixed block, the fixed block are fixedly connected close to the side of reversing valve body with reversing valve body, and two are in pair on slide rail
Claim to set.
Preferably, the cross-sectional area of the connecting plate bottom is more than the cross-sectional area of the first opening, the bottom of the arc block
Portion offers the mounting hole being used cooperatively with open tubular column.
Preferably, the bottom of the fixture block by fixture with being fixedly connected at the top of location-plate, the fixture block bottom
Cross-sectional area is more than the cross-sectional area at the top of location-plate.
Compared with prior art, beneficial effects of the present invention are as follows：
1st, the present invention is by setting reversing valve body, installing plate, location-plate, limited block, fixture block, slide rail, sliding block, arc block, the
One stud, the first nut, clamping plate, buffer unit, open tubular column, spring, connecting plate, connecting pole, slide bar, sliding sleeve, the first positioning
Block, the second locating piece, the second stud and the second nut are used cooperatively, and are solved present reversal valve and are all mounted in plane
, existing reversal valve can not be arranged on cylinder on the problem of, the multiple-directional control valve for petroleum machinery, possess and be easy to user to pacify
The advantages of dress, the use range of the reversal valve is improved, so as to improve the practicality of the reversal valve.
2nd, the present invention is avoided sliding block and occurs the phenomenon departed from slide rail when in use, protected by the setting of projection
Demonstrate,proved sliding block and slide rail can with normal use, by non-slip bumps, avoid reversing valve body on cylindrical object when
Wait and the phenomenon slided occur, add the stability after reversing valve body installation, by being used cooperatively for draw ring and fixed block, rise
To the effect for being easy to user to take dynamic reversing valve body, user's use is facilitated, passes through part and part junction fixture
Setting, avoid part and occur the phenomenon to come off when in use, add part use when steadiness, pass through outer spiral shell
Line and internal thread are used cooperatively, and make the more firm of the first stud, the second stud, the first nut and the connection of the second nut,
By the setting of the first opening, play a part of being easy to connecting pole to move up and down, by the setting of the second opening, play and be easy to pacify
The effect of the first stud and the second stud is filled, by the setting of mounting hole, plays a part of being easily installed buffer unit.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is structural side view of the present invention；
Fig. 3 is the schematic diagram that arc block, buffer unit and clamping plate of the present invention are used cooperatively；
Fig. 4 is the front section view of buffer unit of the present invention.
In figure：1 reversing valve body, 2 installing plates, 3 location-plates, 4 limited blocks, 5 fixture blocks, 6 slide rails, 7 sliding blocks, 8 arc blocks, 9
First stud, 10 first nuts, 11 clamping plates, 12 buffer units, 121 open tubular columns, 122 springs, 123 connecting plates, 124 connections
Post, 125 slide bars, 126 sliding sleeves, 127 first locating pieces, 13 second locating pieces, 14 second studs, 15 second nuts, 16 projections, 17
Non-slip bumps, 18 draw rings, 19 fixed blocks.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Refer to Fig. 1-4, a kind of multiple-directional control valve for petroleum machinery, including reversing valve body 1, the two of reversing valve body 1
Side is provided with two draw rings 18, by being used cooperatively for draw ring 18 and fixed block 19, plays and is easy to user to take dynamic reversal valve
The effect of body 1, user's use is facilitated, and the surface of four draw rings 18 is arranged with fixed block 19, fixed block 19 is close
The side of reversing valve body 1 is fixedly connected with reversing valve body 1, and two fixed blocks 19 are symmetrical set on slide rail 6, commutation
The bottom of valve body 1 is provided with installing plate 2, and the bottom of installing plate 2 offers the second opening being used cooperatively with the first stud 9,
By the setting of the second opening, play a part of being easily installed the first stud 9 and the second stud 14, the bottom of installing plate 2 opens up
There is the 3rd opening being used cooperatively with the second stud 14, the front side at the top of installing plate 2 and rear side are symmetrically fixedly connected with positioning
Plate 3, the front surface of reversing valve body 1 and the back side are symmetrically fixedly connected with limited block 4, and the top of location-plate 3 is through to spacing
The top of block 4, the top of location-plate 3 are fixedly connected with fixture block 5, and the bottom of fixture block 5 is consolidated by the top of fixture and location-plate 3
Fixed connection, by the setting of part and part junction fixture, avoids part and occurs the phenomenon to come off when in use,
Steadiness when part uses is added, the cross-sectional area of the bottom of fixture block 5 is more than the cross-sectional area at the top of location-plate 3, reversal valve
The both sides of body 1 have been fixedly connected with slide rail 6, and the top and bottom of slide rail 6 have been fixedly connected with projection 16, have passed through projection 16
Set, avoid sliding block 7 and the phenomenon departed from occur with slide rail 6 when in use, ensure that sliding block 7 can be normal with slide rail 6
Use, and cross-sectional area of two projections 16 close to the side of slide rail 6 is more than the cross-sectional area of the top and bottom of slide rail 6, slide rail 6 is remote
Side from reversing valve body 1 slidably connects sliding block 7, and side of the sliding block 7 away from slide rail 6 is fixedly connected with arc block 8, arc
The both sides of the bottom of block 8 have been fixedly connected with the first stud 9, and the surface of the surface of the first stud 9 and the second stud 14 is provided with
External screw thread, by being used cooperatively for external screw thread and internal thread, make the first stud 9, the second stud 14, the first nut 10 and the second spiral shell
The connection of mother 15 it is more firm, the inside of the first nut 10 and the second nut 15 offers be used cooperatively with external screw thread in
Screw thread, the bottom of the first stud 9 are through to the bottom of installing plate 2, and the bottom of installing plate 2 is provided with the first nut 10, the first spiral shell
Mother 10 is threadedly coupled with the first stud 9, and side of the slide rail 6 away from reversing valve body 1 is provided with clamping plate 11, the top of clamping plate 11
Portion is fixedly connected with buffer unit 12, and buffer unit 12 includes open tubular column 121, and the bottom of open tubular column 121 offers and connecting pole
124 the first openings being used cooperatively, by the setting of the first opening, play a part of being easy to connecting pole 124 to move up and down, clamp
The bottom of plate 11 is fixedly connected with non-slip bumps 17, by non-slip bumps 17, avoids reversing valve body 1 and is arranged on cylindrical object
Occurred the phenomenon slided when upper, add the stability after reversing valve body 1 is installed, and clamping plate 11 is arc-shaped, it is empty
Stem 121 is located at the inside of arc block 8, and the top of open tubular column 121 is fixed by the top of fixture and the inwall of arc block 8 to be connected
Connect, clamping plate 11 is located at the bottom of arc block 8, and spring 122, the bottom of spring 122 are fixedly connected with the top of the inwall of open tubular column 121
Portion is fixedly connected with connecting plate 123, and the cross-sectional area of the bottom of connecting plate 123 is more than the cross-sectional area of the first opening, arc block 8
Bottom offers the mounting hole being used cooperatively with open tubular column 121, by the setting of mounting hole, plays and is easily installed buffer unit 12
Effect, the bottom of connecting plate 123 is fixedly connected with connecting pole 124, and the bottom of connecting pole 124 is through to arc block 8 with clamping
Plate 11 is fixedly connected, and the top of the inwall of open tubular column 121 is symmetrically fixedly connected with slide bar 125, and the top of connecting plate 123 is through setting
There is sliding sleeve 126, the outer surface of the inwall and slide bar 125 of sliding sleeve 126 is slidably connected, and the bottom of slide bar 125 through sliding sleeve 126 and is prolonged
The bottom for extending connecting plate 123 is fixedly connected with the first locating piece 127, and the cross-sectional area at the top of the first locating piece 127, which is more than, to be slided
The cross-sectional area of the bottom of bar 125, and two slide bars 125 are symmetrical set on spring 122, the both sides of reversing valve body 1 are right
Title is fixedly connected with the second locating piece 13, and the top of the second locating piece 13 is provided through the second stud 14, the second stud 14
Bottom is through to the bottom of installing plate 2, and the bottom of installing plate 2 is provided with the second nut 15, the second stud 14 and the second nut 15
Threaded connection.
In use, reversing valve body 1, when needing to install in the plane, user removes the second nut 15, second
Bolt 14 makes the bottom of installing plate 2 with supporting reversal valve sheet through the supporting plate of the second locating piece 13 and support reversing valve body 1
The top contact of 1 body supporting plate, user carry out screw thread by the external screw thread of the second stud 14 and the internal thread of the second nut 15
Connection, you can reach the effect installed in the plane, when reversing valve body 1 needs to be arranged on cylindrical object,
User removes the first nut 10, and user pulls installing plate 2, make cylindrical object be located at installing plate 2 and reversing valve body 1 it
Between, user pulls arc block 8, and arc block 8 drives gripping block 11, gripping block 11 is contacted with cylindrical object, uses
Person is threadedly coupled by the first nut 10 with the first stud 9, you can and reversing valve body 1 is arranged on cylindrical object, so as to
The effect for being easy to user to install is reached.
In summary：The multiple-directional control valve for petroleum machinery, by set reversing valve body 1, installing plate 2, location-plate 3,
Limited block 4, fixture block 5, slide rail 6, sliding block 7, arc block 8, the first stud 9, the first nut 10, clamping plate 11, buffer unit 12, sky
Stem 121, spring 122, connecting plate 123, connecting pole 124, slide bar 125, sliding sleeve 126, the first locating piece 127, the second locating piece
13rd, the second stud 14 and the second nut 15 are used cooperatively, and are solved present reversal valve and are all mounted in plane, existing
Reversal valve can not be arranged on cylinder on the problem of.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of multiple-directional control valve for petroleum machinery, including reversing valve body（1）, it is characterised in that：The reversing valve body（1）
Bottom be provided with installing plate（2）, the installing plate（2）The front side at top and rear side are symmetrically fixedly connected with location-plate（3）,
The reversing valve body（1）Front surface and the back side be symmetrically fixedly connected with limited block（4）, the location-plate（3）Top
It is through to limited block（4）Top, the location-plate（3）Top be fixedly connected with fixture block（5）, the reversing valve body（1）
Both sides be fixedly connected with slide rail（6）, the slide rail（6）Away from reversing valve body（1）Side slidably connect sliding block
（7）, the sliding block（7）Away from slide rail（6）Side be fixedly connected with arc block（8）, the arc block（8）The both sides of bottom are equal
It is fixedly connected with the first stud（9）, first stud（9）Bottom be through to installing plate（2）Bottom, the installing plate
（2）Bottom be provided with the first nut（10）, first nut（10）With the first stud（9）Threaded connection, the slide rail（6）
Away from reversing valve body（1）Side be provided with clamping plate（11）, the clamping plate（11）Top be fixedly connected with buffering dress
Put（12）, the buffer unit（12）Including open tubular column（121）, the open tubular column（121）Bullet is fixedly connected with the top of inwall
Spring（122）, the spring（122）Bottom be fixedly connected with connecting plate（123）, the connecting plate（123）Bottom fix connect
It is connected to connecting pole（124）, the connecting pole（124）Bottom be through to arc block（8）With clamping plate（11）It is fixedly connected, it is described
Open tubular column（121）The top of inwall is symmetrically fixedly connected with slide bar（125）, the connecting plate（123）Top be provided through
Sliding sleeve（126）, the sliding sleeve（126）Inwall and slide bar（125）Outer surface be slidably connected, the slide bar（125）Bottom
Through sliding sleeve（126）And extend to connecting plate（123）Bottom and the first locating piece（127）It is fixedly connected, the reversal valve sheet
Body（1）Both sides be symmetrically fixedly connected with the second locating piece（13）, second locating piece（13）Top be provided through
Second stud（14）, second stud（14）Bottom be through to installing plate（2）Bottom, the installing plate（2）Bottom
It is provided with the second nut（15）, second stud（14）With the second nut（15）Threaded connection.
A kind of 2. multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that：The slide rail（6）Top
Portion and bottom have been fixedly connected with projection（16）, and two projections（16）Close to slide rail（6）The cross-sectional area of side is more than slide rail
（6）The cross-sectional area of top and bottom.
A kind of 3. multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that：The open tubular column（121）
Bottom offer and connecting pole（124）The first opening being used cooperatively, the clamping plate（11）Bottom be fixedly connected with it is anti-
Sliding projection（17）, and clamping plate（11）For arc-shaped.
A kind of 4. multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that：The installing plate（2）'s
Bottom offers and the first stud（9）The second opening being used cooperatively, the installing plate（2）Bottom offer and the second stud
（14）The 3rd opening being used cooperatively.
A kind of 5. multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that：First stud（9）
Surface and the second stud（14）Surface be provided with external screw thread, first nut（10）With the second nut（15）Inside
Offer the internal thread being used cooperatively with external screw thread.
A kind of 6. multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that：First locating piece
（127）The cross-sectional area at top is more than slide bar（125）The cross-sectional area of bottom, and two slide bars（125）On spring（122）It is in
It is symmetrical arranged.
A kind of 7. multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that：The open tubular column（121）
Positioned at arc block（8）Inside, the open tubular column（121）Top pass through fixture and arc block（8）The top of inwall is fixed
Connection, the clamping plate（11）Positioned at arc block（8）Bottom.
A kind of 8. multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that：The reversing valve body
（1）Both sides be provided with two draw rings（18）, and four draw rings（18）Surface be arranged with fixed block（19）, the fixation
Block（19）Close to reversing valve body（1）Side and reversing valve body（1）It is fixedly connected, and two fixed blocks（19）On slide rail
（6）It is symmetrical set.
A kind of 9. multiple-directional control valve for petroleum machinery according to claim 1 or 3, it is characterised in that：The connecting plate
（123）The cross-sectional area of bottom is more than the cross-sectional area of the first opening, the arc block（8）Bottom offer and open tubular column
（121）The mounting hole being used cooperatively.
A kind of 10. multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that：The fixture block（5）Bottom
Portion passes through fixture and location-plate（3）Top be fixedly connected, the fixture block（5）The cross-sectional area of bottom is more than location-plate（3）
The cross-sectional area at top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710458059.9A CN107387831B (en) | 2017-06-16 | 2017-06-16 | A kind of multiple-directional control valve for petroleum machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710458059.9A CN107387831B (en) | 2017-06-16 | 2017-06-16 | A kind of multiple-directional control valve for petroleum machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107387831A true CN107387831A (en) | 2017-11-24 |
| CN107387831B CN107387831B (en) | 2018-12-14 |
Family
ID=60333350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710458059.9A Active CN107387831B (en) | 2017-06-16 | 2017-06-16 | A kind of multiple-directional control valve for petroleum machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107387831B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109458472A (en) * | 2018-10-29 | 2019-03-12 | 刘慧华 | A kind of multichannel conversion oil valve |
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| JP2007078085A (en) * | 2005-09-14 | 2007-03-29 | Hitachi Constr Mach Co Ltd | Hydraulic operation device of working machine |
| CN201043545Y (en) * | 2007-04-24 | 2008-04-02 | 上海立新液压有限公司 | Duplex electro hydraulic reversal valve |
| CN101846111A (en) * | 2010-06-10 | 2010-09-29 | 江苏鼎晟液压有限公司 | Pilot proportional multi-path reversing valve |
| CN201739251U (en) * | 2010-05-27 | 2011-02-09 | 南通华东油压科技有限公司 | Multiple-directional control valve for petroleum machinery |
| CN204458615U (en) * | 2015-02-11 | 2015-07-08 | 宁波市豪发液压气动有限公司 | A kind of commutation hydrovalve for petroleum machinery |
| US9249701B2 (en) * | 2010-03-23 | 2016-02-02 | Aisin Seiki Kabushiki Kaisha | Valve case for oil control valve |
-
2017
- 2017-06-16 CN CN201710458059.9A patent/CN107387831B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007078085A (en) * | 2005-09-14 | 2007-03-29 | Hitachi Constr Mach Co Ltd | Hydraulic operation device of working machine |
| CN201043545Y (en) * | 2007-04-24 | 2008-04-02 | 上海立新液压有限公司 | Duplex electro hydraulic reversal valve |
| US9249701B2 (en) * | 2010-03-23 | 2016-02-02 | Aisin Seiki Kabushiki Kaisha | Valve case for oil control valve |
| CN201739251U (en) * | 2010-05-27 | 2011-02-09 | 南通华东油压科技有限公司 | Multiple-directional control valve for petroleum machinery |
| CN101846111A (en) * | 2010-06-10 | 2010-09-29 | 江苏鼎晟液压有限公司 | Pilot proportional multi-path reversing valve |
| CN204458615U (en) * | 2015-02-11 | 2015-07-08 | 宁波市豪发液压气动有限公司 | A kind of commutation hydrovalve for petroleum machinery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109458472A (en) * | 2018-10-29 | 2019-03-12 | 刘慧华 | A kind of multichannel conversion oil valve |
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| Publication number | Publication date |
|---|---|
| CN107387831B (en) | 2018-12-14 |
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