CN107387831B - A kind of multiple-directional control valve for petroleum machinery - Google Patents
A kind of multiple-directional control valve for petroleum machinery Download PDFInfo
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- CN107387831B CN107387831B CN201710458059.9A CN201710458059A CN107387831B CN 107387831 B CN107387831 B CN 107387831B CN 201710458059 A CN201710458059 A CN 201710458059A CN 107387831 B CN107387831 B CN 107387831B
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- valve body
- directional control
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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
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve Housings (AREA)
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 mounting plate, front side and rear side at the top of the mounting plate are symmetrically fixedly connected with positioning plate, and the front surface of the reversing valve body and the back side are symmetrically fixedly connected with limited block.The present invention passes through setting reversing valve body, mounting plate, positioning plate, limited block, fixture block, sliding rail, sliding block, arc block, first stud, first nut, clamping plate, buffer unit, open tubular column, spring, connecting plate, connecting column, slide bar, sliding sleeve, first locating piece, second locating piece, second stud and the second nut are used cooperatively, it solves present reversal valve to be all mounted in plane, existing reversal valve can not be mounted on the problem on cylinder, the multiple-directional control valve for petroleum machinery, has the advantages of convenient for user's installation, improve the use scope of the reversal valve, to improve the practicability 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 technique
Reversal valve is to change the on-off relationship for being connected to oil duct on valve body by the relative motion between spool and valve body
Valve class, multiple directional control valve be by the combination valve based on two or more reversal valve, can be with according to different job requirements
Group is closed the subsidiary valves such as safety overflow valve, check valve and Fill valve and is compared with other kinds of valve, and multiple directional control valve has structure
The compact pressure loss is small, and slide valve moving resistance is little, has multidigit function, service life long, 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 mounted on cylinder, limit to the use scope of reversal valve, it has not been convenient to which user installs, and reduces
The practicability of existing reversal valve.
Summary of the invention
The purpose of the present invention is to provide a kind of multiple-directional control valve for petroleum machinery, have convenient for the excellent of user's installation
Point solves present reversal valve and is all mounted in plane, and existing reversal valve can not be mounted on the problem on cylinder.
To achieve the above object, it the invention provides the following technical scheme: a kind of multiple-directional control valve for petroleum machinery, including changes
To valve body, the bottom of the reversing valve body is provided with mounting plate, and the front side and rear side at the top of the mounting plate are symmetrically solid
Surely it is connected with positioning plate, the front surface of the reversing valve body and the back side are symmetrically fixedly connected with limited block, the positioning plate
Top be through to the top of limited block, be fixedly connected with fixture block, the two sides of the reversing valve body at the top of the limited block
It is fixedly connected to sliding rail, the sliding rail slidably connects sliding block far from the side of reversing valve body, and the sliding block is far from sliding rail
Side be fixedly connected with arc block, the two sides of the arc block bottom are fixedly connected to the first stud, first stud
Bottom be through to the bottom of mounting plate, the bottom of the mounting plate is provided with the first nut, first nut and the first spiral shell
Male screw connection, the sliding rail are provided with clamping plate far from the side of reversing valve body, are fixedly connected at the top of the clamping plate
There is buffer unit, the buffer unit includes open tubular column, and spring, the spring are fixedly connected at 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 column, and the bottom of the connecting column is run through
It is fixedly connected to arc block with clamping plate, the top of the hollow block inner wall is symmetrically fixedly connected with slide bar, the connecting plate
Top is provided through sliding sleeve, and the inner wall of the sliding sleeve and the outer surface of slide bar are slidably connected, and the bottom of the slide bar is through cunning
It covers and the bottom for extending to connecting plate is fixedly connected with the first locating piece, the two 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 mounting plate, the bottom of the mounting plate are provided with the second nut, second stud and the connection of the second nut thread.
Preferably, convex block is fixedly connected at the top and bottom of the sliding rail, and two convex blocks are close to sliding rail side
Cross-sectional area is greater than the cross-sectional area at the top and bottom of sliding rail.
Preferably, the bottom of the hollow block offers the first opening being used cooperatively with downlink connection column, the clamping plate
Bottom be fixedly connected with anti-slip protrusion, and clamping plate is circular arc device.
Preferably, the bottom of the mounting plate offers the second opening being used cooperatively with the first stud, the mounting plate
Bottom offer the third being used cooperatively with the second stud and be open.
Preferably, the surface of first stud and the surface of the second stud are provided with external screw thread, first nut
The internal screw 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 greater than the cross-sectional area of slide bar bottom, and two slide bars
It is symmetrical set about spring.
Preferably, the open tubular column is located at the inside of arc block, and the top of the open tubular column passes through fixing piece and arc block
It is fixedly connected at the top of inner wall, the clamping plate is located at the bottom of arc block.
Preferably, the two sides of the reversing valve body are respectively provided with there are two pull ring, and the surface of four pull 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 about sliding rail
Claim setting.
Preferably, the cross-sectional area of the connecting plate bottom is greater 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 passes through is fixedly connected at the top of fixing piece and positioning plate, the fixture block bottom
Cross-sectional area is greater than the cross-sectional area at the top of positioning plate.
Compared with prior art, beneficial effects of the present invention are as follows:
1, the present invention passes through setting reversing valve body, mounting plate, positioning plate, limited block, fixture block, sliding rail, sliding block, arc
Block, the first stud, the first nut, clamping plate, buffer unit, open tubular column, spring, connecting plate, connecting column, slide bar, sliding sleeve, first
Locating piece, the second locating piece, the second stud and the second nut are used cooperatively, solve present reversal valve be all mounted in it is flat
On face, existing reversal valve can not be mounted on the problem on cylinder, which has easy to use
The advantages of person installs, improves the use scope of the reversal valve, to improve the practicability of the reversal valve.
2, the present invention avoids the phenomenon that sliding block is detached from sliding rail when in use by the setting of convex block, protects
Having demonstrate,proved sliding block and sliding rail can be used normally, by anti-slip protrusion, avoid reversing valve body be mounted on cylindrical object when
Time the phenomenon that slide, the stability after reversing valve body is installed is increased, by being used cooperatively for pull ring and fixed block,
To the effect for taking dynamic reversing valve body convenient for user, the person of being convenient to use is used, and passes through part and part junction fixing piece
Setting, avoid the phenomenon that part falls off when in use, increase part use when stability, pass through outer spiral shell
Line and internal screw 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 the role of moving up and down convenient for connecting column, by the setting of the second opening, play convenient for peace
The effect for filling the first stud and the second stud is played the role of being easily installed buffer unit by the setting of mounting hole.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is structure of the invention side view；
Fig. 3 is the schematic diagram that arc block of the present invention, buffer unit and clamping plate are used cooperatively；
Fig. 4 is the front section view of buffer unit of the present invention.
In figure: 1 reversing valve body, 2 mounting plates, 3 positioning plates, 4 limited blocks, 5 fixture blocks, 6 sliding 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
Column, 125 slide bars, 126 sliding sleeves, 127 first locating pieces, 13 second locating pieces, 14 second studs, 15 second nuts, 16 convex blocks, 17
Anti-slip protrusion, 18 pull rings, 19 fixed blocks.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please 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 respectively provided with there are two pull ring 18, by being used cooperatively for pull ring 18 and fixed block 19, is played and is taken dynamic reversal valve convenient for user
The effect of ontology 1, the person of being convenient to use uses, and the surface of four pull rings 18 is arranged with fixed block 19, and 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 about sliding rail 6, commutation
The bottom of valve body 1 is provided with mounting plate 2, and the bottom of mounting plate 2 offers the second opening being used cooperatively with the first stud 9,
By the setting of the second opening, play the role of being easily installed the first stud 9, the bottom of mounting plate 2 offers and the second stud
The 14 third openings being used cooperatively, the front side at 2 top of mounting plate and rear side are symmetrically fixedly connected with positioning plate 3, reversal valve sheet
The front surface of body 1 and the back side are symmetrically fixedly connected with limited block 4, and the top of positioning plate 3 is through to the top of limited block 4, fixed
The top of position plate 3 is fixedly connected with fixture block 5, and the bottom of fixture block 5 is fixedly connected with the top of positioning plate 3 by fixing piece, is passed through
The setting of part and part junction fixing piece, avoids the phenomenon that part falls off when in use, increases part
Stability when use, the cross-sectional area of 5 bottom of fixture block are greater than the cross-sectional area at 3 top of positioning plate, the two sides of reversing valve body 1
It is fixedly connected to sliding rail 6, the top and bottom of sliding rail 6 are fixedly connected to convex block 16, by the setting of convex block 16, avoid
The phenomenon that sliding block 7 is detached from sliding rail 6 when in use ensure that sliding block 7 can be used normally with sliding rail 6, and two
Cross-sectional area of the convex block 16 close to 6 side of sliding rail is greater than the cross-sectional area of 6 top and bottom of sliding rail, and sliding rail 6 is far from reversal valve sheet
The side of body 1 slidably connects sliding block 7, and sliding block 7 is fixedly connected with arc block 8 far from the side of sliding rail 6,8 bottom of arc block
Two sides are fixedly connected to 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, lead to
Being used cooperatively for external screw thread and internal screw thread is crossed, the first stud 9, the second stud 14, the first nut 10 and the connection of the second nut 15 are made
It is more firm, the inside of the first nut 10 and the second nut 15 offers the internal screw thread being used cooperatively with external screw thread, the
The bottom of one stud 9 is through to the bottom of mounting plate 2, and the bottom of mounting plate 2 is provided with the first nut 10, the first nut 10 and
One stud 9 is threadedly coupled, and sliding rail 6 is provided with clamping plate 11 far from the side of reversing valve body 1, and the top of clamping plate 11 is fixed to be connected
It is connected to buffer unit 12, buffer unit 12 includes open tubular column 121, and the bottom of open tubular column 121 is offered to be made with the cooperation of connecting column 124
First opening plays the role of moving up and down convenient for connecting column 124, the bottom of clamping plate 11 by the setting of the first opening
Portion is fixedly connected with anti-slip protrusion 17, by anti-slip protrusion 17, when avoiding reversing valve body 1 and be mounted on cylindrical object
The phenomenon that sliding, increase reversing valve body 1 install after stability, and clamping plate 11 be arc-shaped, open tubular column 121
In the inside of arc block 8, the top of open tubular column 121 at the top of fixing piece and 8 inner wall of arc block by being fixedly connected, clamping plate 11
Positioned at the bottom of arc block 8, spring 122 is fixedly connected at the top of 121 inner wall of open tubular column, the bottom of spring 122 is fixedly connected
There is connecting plate 123, the cross-sectional area of 123 bottom of connecting plate is greater than the cross-sectional area of the first opening, and the bottom of arc block 8 offers
The mounting hole being used cooperatively with open tubular column 121 plays the role of being easily installed buffer unit 12 by the setting of mounting hole, even
The bottom of fishplate bar 123 is fixedly connected with connecting column 124, and the bottom of connecting column 124 is through to arc block 8 and the fixed company of clamping plate 11
It connecing, the top of 121 inner wall of open tubular column is symmetrically fixedly connected with slide bar 125, and the top of connecting plate 123 is provided through sliding sleeve 126,
The inner wall of sliding sleeve 126 and the outer surface of slide bar 125 are slidably connected, and the bottom of slide bar 125 through sliding sleeve 126 and extends to connecting plate
123 bottom is fixedly connected with the first locating piece 127, and the cross-sectional area at 127 top of the first locating piece is greater than 125 bottom of slide bar
Cross-sectional area, and two slide bars 125 are symmetrical set about spring 122, the two sides of reversing valve body 1 are symmetrically fixedly connected with
Second locating piece 13, the top of the second locating piece 13 are provided through the second stud 14, and the bottom of the second stud 14 is through to peace
The bottom of loading board 2, the bottom of mounting plate 2 are provided with the second nut 15, and the second stud 14 and the second nut 15 are threadedly coupled.
In use, reversing valve body 1, when needing to install in the plane, user removes the second nut 15, second
Bolt 14 passes through the support plate of the second locating piece 13 and support reversing valve body 1, makes bottom and the support reversal valve sheet of mounting plate 2
The top of 1 body support plate contacts, and user carries out screw thread by the external screw thread of the second stud 14 and the internal screw thread of the second nut 15
Connection, that is, can reach the effect installed in the plane, when reversing valve body 1 needs to be mounted on cylindrical object,
User removes the first nut 10, and user pulls mounting plate 2, make cylindrical object be located at mounting plate 2 and reversing valve body 1 it
Between, user pulls arc block 8, and arc block 8 drives gripping block 11, contacts gripping block 11 with cylindrical object, uses
Person is threadedly coupled by the first nut 10 with the first stud 9, and reversing valve body 1 can be made to be mounted on cylindrical object, thus
Achieve the effect that convenient for user's installation.
In summary: the multiple-directional control valve for petroleum machinery, by setting reversing valve body 1, mounting plate 2, positioning plate 3,
Limited block 4, fixture block 5, sliding 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 column 124, slide bar 125, sliding sleeve 126, the first locating piece 127, the second locating piece
13, 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 mounted on the problem on cylinder.
It 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 variations, modification, replacement can be carried out to these embodiments 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 mounting plate (2), the front side and rear side at the top of the mounting plate (2) are symmetrically fixedly connected with positioning plate (3),
The front surface of the reversing valve body (1) and the back side are symmetrically fixedly connected with limited block (4), the top of the positioning plate (3)
It is through to the top of limited block (4), is fixedly connected with fixture block (5) at the top of the positioning plate (3), the reversing valve body (1)
Two sides be fixedly connected to sliding rail (6), the sliding rail (6) slidably connects sliding block far from the side of reversing valve body (1)
(7), the sliding block (7) is fixedly connected with arc block (8) far from the side of sliding rail (6), and the two sides of arc block (8) bottom are equal
It is fixedly connected with the first stud (9), the bottom of first stud (9) is through to the bottom of mounting plate (2), the mounting plate
(2) bottom is provided with the first nut (10), and first nut (10) is threadedly coupled with the first stud (9), the sliding rail (6)
Side far from reversing valve body (1) is provided with clamping plate (11), and buffering dress is fixedly connected at the top of the clamping plate (11)
It sets (12), the buffer unit (12) includes open tubular column (121), is fixedly connected with bullet at the top of open tubular column (121) inner wall
The bottom of spring (122), the spring (122) is fixedly connected with connecting plate (123), and the bottom of the connecting plate (123) is fixed to be connected
It is connected to connecting column (124), the bottom of the connecting column (124) is through to arc block (8) and is fixedly connected with clamping plate (11), described
The top of open tubular column (121) inner wall is symmetrically fixedly connected with slide bar (125), is provided through at the top of the connecting plate (123)
The outer surface of sliding sleeve (126), the inner wall and slide bar (125) of the sliding sleeve (126) is slidably connected, the bottom of the slide bar (125)
Through sliding sleeve (126) and the bottom that extends to connecting plate (123) is fixedly connected with the first locating piece (127), the reversal valve sheet
The two sides of body (1) are symmetrically fixedly connected with the second locating piece (13), are provided through at the top of second locating piece (13)
Second stud (14), the bottom of second stud (14) are through to the bottom of mounting plate (2), the bottom of the mounting plate (2)
It is provided with the second nut (15), second stud (14) and the second nut (15) are threadedly coupled.
2. a kind of multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that: the top of the sliding rail (6)
Portion and bottom are fixedly connected to convex block (16), and cross-sectional area of two convex blocks (16) close to sliding rail (6) side is greater than sliding rail
(6) cross-sectional area at the top and bottom of.
3. a kind of multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that: the open tubular column (121)
Bottom offer with connecting column (124) be used cooperatively first opening, the bottom of the clamping plate (11) is fixedly connected with anti-
Sliding convex block (17), and clamping plate (11) is arc-shaped.
4. a kind of multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that: the mounting plate (2)
Bottom offers the second opening being used cooperatively with the first stud (9), and the bottom of the mounting plate (2) offers and the second stud
(14) the third opening being used cooperatively.
5. a kind of multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that: first stud (9)
Surface and the surface of the second stud (14) be provided with external screw thread, the inside of first nut (10) and the second nut (15)
Offer the internal screw thread being used cooperatively with external screw thread.
6. a kind of multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that: first locating piece
(127) cross-sectional area at the top of is greater than the cross-sectional area of slide bar (125) bottom, and two slide bars (125) are in about spring (122)
It is symmetrical arranged.
7. a kind of multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that: the open tubular column (121)
Positioned at the inside of arc block (8), the top of the open tubular column (121) is fixed by the top of fixing piece and arc block (8) inner wall
Connection, the clamping plate (11) are located at the bottom of arc block (8).
8. a kind of multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that: the reversing valve body
(1) two sides are respectively provided with there are two pull ring (18), and the surface of four pull rings (18) is arranged with fixed block (19), the fixation
Block (19) is fixedly connected close to the side of reversing valve body (1) with reversing valve body (1), and two fixed blocks (19) are about sliding rail
(6) it is symmetrical set.
9. a kind of multiple-directional control valve for petroleum machinery according to claim 1 or 3, it is characterised in that: the connecting plate
(123) cross-sectional area of bottom is greater than the cross-sectional area of the first opening, and the bottom of the arc block (8) offers and open tubular column
(121) mounting hole being used cooperatively.
10. a kind of multiple-directional control valve for petroleum machinery according to claim 1, it is characterised in that: the bottom of the fixture block (5)
By being fixedly connected at the top of fixing piece and positioning plate (3), the cross-sectional area of fixture block (5) bottom is greater than positioning plate (3) in portion
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 CN107387831A (en) | 2017-11-24 |
| CN107387831B true CN107387831B (en) | 2018-12-14 |
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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 |
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| CN (1) | CN107387831B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109458472B (en) * | 2018-10-29 | 2020-05-29 | 新沂市邵店众创工贸发展有限公司 | Multi-path 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 | Publication date |
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| CN107387831A (en) | 2017-11-24 |
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