CN105972226B - Quick two-way shut-off valve - Google Patents
Quick two-way shut-off valve Download PDFInfo
- Publication number
- CN105972226B CN105972226B CN201610491080.4A CN201610491080A CN105972226B CN 105972226 B CN105972226 B CN 105972226B CN 201610491080 A CN201610491080 A CN 201610491080A CN 105972226 B CN105972226 B CN 105972226B
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- Prior art keywords
- valve
- port
- valve body
- quick
- plug
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
- F16K1/427—Attachment of the seat to the housing by one or more additional fixing elements
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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
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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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
- F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
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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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
- F16K41/06—Spindle sealings with stuffing-box ; Sealing rings with at least one ring attached to both spindle and housing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a kind of quick two-way shut-off valve, including valve body, end cap and valve stem, the end cap is fixed on valve body top, is provided on the end cap and protrudes into the intracorporal seal lip of valve；The valve plug for valve inner to be divided into upper chamber and lower chamber is movably set in the valve body, the stomata of connection upper chamber and lower chamber is offered on the valve plug, the valve rod protrudes into valve body from valve body lower portion and is fixedly connected with valve plug, it is provided with the port one communicated with upper chamber on the valve body, the port two communicated with upper chamber is provided on the end cap；On-off between valve plug and seal lip cooperation control port one and port two.The present invention can reduce the axial compressive force of valve plug receiving when being opened and closed shut-off valve, the opening and closing of shut-off valve can rapidly be realized with lesser driving force, and then extend the service life of valve plug.
Description
Technical field
The invention belongs to gas control engineering field more particularly to a kind of quick two-way shut-off valves, are suitable for vehicle air spring
Each gas chamber between connection control.
Background technique
Will the pipeline on-off the container between two different pressure of connection carry out automatically controlling, nearly all will use it is electronic,
Pneumatic or hydraulic pressure removes control shut-off valve valve as power source, and airflow direction most of the time is nearly all certain
, i.e., gas flows into B container by valve from A container, and the shutdown of valve is realized under the conditions of such and good sealing is
Through no difficulty.But traditional gas valve is generally using the groove of valve rod axial displacement and valve body with sealing ring, sealing
Pair cooperation turns off gas circuit, or turns off gas circuit using by the way of seal end face covering venthole.Although the former is able to achieve
The sealing of pipeline two-way airflow, but understand from closing to open moment because the pressure difference porting is close when excessive in valve
Seal is extruded, and can only generally be born the pressure difference for being not more than 2mpa after turning off, is suitble to low-pressure gas control.And use end face close
Although the mode of envelope can bear high pressure, but because lift valve rod when latus rectum increases and valve is opened needs
Driving force greatly increases, while under valve-closed state, and the pressure that the gas pressure that valve rod is born acts on sealing surface is very big,
Requirement to seal is very high, and the service life is not also grown.Due to being influenced by factor above, for the height pressure valve one of big orifice
As all use pilot-operated type driving method, but come with movement time it is all long.
Summary of the invention
It is an object of the invention to overcome the above-mentioned problems in the prior art, a kind of quick two-way shut-off valve is provided,
The present invention can reduce the axial force of valve plug receiving when being opened and closed shut-off valve, can rapidly realize cut-off with lesser driving force
The opening and closing of valve, and then extend the service life of valve plug.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of quick two-way shut-off valve, it is characterised in that: including valve body, end cap and valve stem, the end cap is fixed on valve body
Top is provided on the end cap and protrudes into the intracorporal seal lip of valve；It is movably set in the valve body for by valve inner
Be divided into the valve plug of upper chamber and lower chamber, offered on the valve plug connection upper chamber and lower chamber stomata, the valve rod from
Valve body lower portion protrudes into valve body and is fixedly connected with valve plug, and the port one communicated with upper chamber, the end cap are provided on the valve body
On be provided with the port two communicated with upper chamber；On-off between valve plug and seal lip cooperation control port one and port two.
It is provided with the limited step for limiting to valve plug in the valve body, is formed with guiding valve below the limited step
The pilot hole moved up and down is filled in, the port one is located above limited step.
The diameter of the pilot hole and the central diameter of seal lip are identical.
Balanced seal circle is provided between the valve plug and pilot hole.
Limiting buffer block is provided on the limited step.
Outer diameter extending portion compatible with valve block internal diameter is provided on the end cap, the lower end outer diameter of the extending portion is gradually
Reduce, forms cone seal lip when close with extending portion internal diameter.
It is inlaid with sealing ring on the upper surface of the valve plug, which is located at the underface of seal lip.
Constant force spring is arranged on the valve rod, the constant force spring is located at below the intracorporal valve plug of valve.
The end cap is connect with valve body by fastening bolt, and sealing ring is provided between end cap and valve body.
Valve stem packing ring is provided between the valve body and valve rod.
Using the present invention has the advantages that
One, in the present invention, when being separated by valve rod control valve plug with seal lip, port one and port two pass through upper gas
Room communicates, and shut-off valve is opened at this time；When passing through the seal lip on valve rod control valve plug end cover, port one and port
Two are turned off, and are not communicated with, and shut-off valve is closed at this time.During the opening and closing of shut-off valve, the stomata on valve plug has special role,
It first is to be connected to upper lower chamber, the air pressure of lower chamber in balance cooperates each diameter of pilot hole internal diameter and seal lip to set
Meter, reaches the flexible design of latus rectum, cutoff pressure and driving force, it is often more important that enough by the stomata latus rectum on setting valve plug
When big, during valve rod drives up power and acts on ShiShimonoseki valve closing door, the pressure difference of upper lower chamber can greatly reduce valve plug,
Suffered downward axial force will also greatly reduce between valve plug upper and lower end face, and the upward acceleration of valve plug greatly improves, and valve is closed
Time accordingly shorten, easily realize valve high speed close, similarly, in same driving force, can also be improved valve opening
Speed.Above structure not only shortens the opening/closing time of shut-off valve, correspondingly, also extends the service life of valve plug.
Two, in the present invention, it can be limited when valve plug is moved downwardly to minimum point by limited step, obtains valve
Suitable aperture.The up and down motion of valve plug can be oriented to by pilot hole, it is ensured that sealing-plug is concentric with sealing lip, guarantees
The shutdown effect of shut-off valve.
Three, in the present invention, if the central diameter of guiding bore dia opposing seal lip is smaller, after valve is closed, port one
Gas pressure it is bigger in the axially upwardly power of valve plug, on the contrary, to act on the downward active force of valve plug also bigger for port two, such as
As soon as be port pressure much higher than port two, valve remains off only enough by the gas load of port one, does not need
Valve rod driving force, but to open valve, it is necessary to bigger downward drive force, guiding bore dia is smaller, opens the drive of valve
Power is bigger.If the pressure of port two is much higher than port one, then valve is maintained to close, it is necessary to which valve rod provides upward
Driving force is bigger, and valve opening does not need downward drive force, only can open valve by the gas pressure power of port two.If leading
Central diameter to bore dia opposing seal lip is bigger, after valve is continuously off the gas pressure of port one in valve plug to
Lower axial force is bigger, on the contrary, to act on the upward active force of valve plug also bigger for port two, if the air pressure of port two is much higher than
As soon as port, valve, which remains off, only leans on the gas load of port two enough, valve rod driving force is not needed, but to open valve
Door, it is necessary to which bigger downward drive force, guiding bore dia is bigger, and the driving force for opening valve is bigger, if it is port one
Air pressure be much higher than port two, valve remain off just need it is bigger drive up power, and only can by the air pressure of port one
To open valve, does not need valve rod and driving force is provided.To sum up, when guiding bore dia is more than or less than seal lip central diameter
When, after valve closing, when pressure difference occur in port one and port two, either opens to maintaining valve to close, can all increase
To the driving force that valve rod provides, in one timing of seal lip central diameter, guiding bore dia is bigger or smaller, port one and port
Relative barometric pressure is bigger between two, and the requirement to driving force is also bigger, and valve is difficult to accomplish big orifice and high-pressure stop.Therefore, will
The diameter of pilot hole is arranged to, with this condition shut-off valve closing, with port one gas identical as the central diameter of seal lip
Area of the valve plug back side and upper surface difference in areas of contact between seal lip central diameter and outer diameter, contacts with two gas of port
Area between seal lip central diameter and internal diameter of the valve plug back side and upper surface difference in areas, in seal lip internal-and external diameter difference
In lesser situation, the gas of port one and port two acts on that the area on valve plug is close and very little, holds as a result, in valve
Continue the down periods, axial force suffered by valve plug is for port a pair of seal lips mouth central diameter outside area active force with port two to close
The sum of area active force on the inside of lip central diameter is sealed, in this way, whether the air pressure of port one is higher than port two or port two
Air pressure be higher than port one, the gas pressure of port one and port two is in axially upwardly pressure value all very littles on valve plug, in valve
Door continuously off period, the driving force for maintaining valve to close will open valve from closed state, also only need smaller axis with regard to very little
To driving force.
Four, in the present invention, by the way that balanced seal circle is arranged, it is ensured that after shut-off valve is closed, the gap between pilot hole and valve plug
It is not in leakage.
Five, in the present invention, valve plug can be limited and is buffered by limiting buffer block, prevented valve plug impaired, be conducive to mention
The service life of lift valve plug.
Six, in the present invention, the lower end outer diameter of extending portion is gradually reduced, and forms cone seal when close with extending portion internal diameter
Lip, the structure can obtain optimal seal lip end face by the best internal-and external diameter of the seal lip of setting pyramidal structure
Area does not exceed sealing when being generated the resultant force of axial force to valve plug by valve rod driving force and port one and port two
Plug or sealing ring security intensity, cause the lost of life of valve plug or sealing ring, herein under the premise of minimize seal lip
Internal-and external diameter reduce the driving force of valve rod, or in valve rod driving force one under conditions of valve latus rectum and certain cutoff pressure
Under conditions of fixed, the latus rectum and cutoff pressure of valve can be improved, thus valve latus rectum, switching speed, cutoff pressure and
It is designed very flexibly and conveniently in terms of driving power.
Seven, in the present invention, the leakproofness after shut-off valve is closed is able to ascend by sealing ring, shut-off valve is made to reach zero leakage
Effect, and then ensure that there are shut-off valves when high pressure pressure difference or larger seal lip internal diameter still can between port one and port two
Enough reliable closings.
Eight, in the present invention, driving force required for external shut-off valve is closed can be driven by constant force spring, mainly surely
The driving that be scheduled on prevents valve rod from transmitting in the case where ensuring that shut-off valve is reliably closed brings punching to the sealing surface or sealing ring of valve plug
It hits, the service life of extend as far as possible valve plug.
Nine, in the present invention, by the valve stem packing ring between the sealing ring and valve body and valve rod between end cap and valve body, into
One step improves the sealing effect of entire shut-off valve.
Ten, the configuration of the present invention is simple does not have particular/special requirement to manufacturing process, is particularly suitable for each of automobile air spring
The automatic control of air circuit breaker between gas chamber is that oil liquid or gas-liquid mixture are similarly suitable for medium.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Label in figure are as follows: 1, seal lip, 2, sealing ring, 3, valve plug, 4, balanced seal circle, 5, lower chamber, 6, valve body,
7, valve stem packing ring, 8, valve rod, 9, constant force spring, 10, pilot hole, 11, limiting buffer block, 12, stomata, 13, upper chamber, 14,
Port one, 15, end cap, 16, fastening bolt, 17, port two, 18, sealing ring, 19, limited step.
Specific embodiment
A kind of quick two-way shut-off valve, including valve body 6, end cap 15 and valve rod 8, wherein the positional relationship of each component and company
It is (as shown in Figure 1) as described below to connect relationship:
The end cap 15 is fixed on 6 top of valve body by fastening bolt 16, and sealing is provided between end cap 15 and valve body 6
Circle 18, makes to form sealed gas chamber between end cap 15 and valve body 6.
Outer diameter extending portion compatible with 6 internal diameter of valve body, the lower end outer diameter of the extending portion are provided on the end cap 15
It is gradually reduced, forms the seal lip of pyramidal structure when the lower end outer diameter of extending portion is gradually decrease to close with extending portion internal diameter
1。
It is movably set in the valve body 6 for the valve plug 3 of upper chamber 13 and lower chamber 5 will to be divided into inside valve body 6, it is described
The stomata 12 that connection upper chamber 13 and lower chamber 5 is offered on valve plug 3 is provided in the valve body 6 for limiting to valve plug 3
Limited step 19 is formed with the pilot hole 10 that guidance valve plug 3 moves up and down below the limited step 19, sets on the valve body 6
It is equipped with the port 1 communicated with upper chamber 13, the port 1 is located at 19 top of limited step, is arranged on the end cap 15
There is the port 2 17 communicated with upper chamber 13, it is logical between valve plug 3 and the cooperation of seal lip 1 control port 1 and port 2 17
It is disconnected.Wherein, the valve plug 3 is located under seal lip 1 and can move up and down along pilot hole 10, valve plug 3 up it is mobile push down it is close
It will separate between port 1 and port 2 17 when sealing lip 1, shut-off valve is closed, by port 1 and port two when moving down
It is connected between 17, shut-off valve is opened.Further, sealing ring 2 is embedded on 3 upper surface of valve plug, which is located at sealing
The underface of lip 1, and face area is greater than 1 face area of seal lip.Wherein, sealing ring 2 can choose rubber, tetrafluoro etc.
Material is made, to ensure that there are cut-offs when high pressure pressure difference or larger 1 internal diameter of seal lip between port 1 and port 2 17
Valve still can be closed reliably, and sealing ring 2 can bear bigger external driving force.The valve plug 3 preferably uses metal material
It is made, it is also possible to directly adopt the nonmetallic materials production for having sealing performance, such as tetrafluoro, nylon.
The diameter of the pilot hole 10 is same or similar with the central diameter of seal lip 1, it is ensured that when shut-off valve is closed,
The axial force that pressure difference between port 1 and port 2 17 suffered by valve plug 3 is applied to valve plug 3 is minimum.
Balanced seal circle 4 is equipped between 3 lower outside of valve plug and pilot hole 10, effect is continuously off in shut-off valve
Period prevents the gas between port 1 and lower chamber 5 from leaking.
The quantity of the stomata 12 can be one or more, and the aperture of stomata 12 is to guarantee the rigid of valve plug 3
Under the premise of, it is increased as far as possible to reduce pressure difference when valve plug 3 moves up and down between 3 lower end surface of 3 upper surface of valve plug and valve plug as far as possible,
Shorten the opening and closing time of shut-off valve when valve rod 8 is by identical driving force.
Limiting buffer block 11 is fixedly installed on the limited step 19, effect is when valve plug 3 is moved downward to valve
Plug 3 forms buffering.
Constant force spring 9 is arranged on the valve rod 8, the constant force spring 9 is located at 3 lower section of valve plug in valve body 6.It is specific
Structure are as follows: valve rod 8 is made of the different cylinder body by integral forming of two sections of outer diameters, and the lesser one end of 8 top external diameter of valve rod is under valve body 6
Portion is fixedly connected after passing through constant force spring 9 with valve plug 3, and the biggish one end of 8 top external diameter of valve rod stretches out valve body 6 and accepts driving force, and
Valve stem packing ring 7 is provided between valve rod 8 and valve body 6.
In the present invention, as long as the internal-and external diameter difference of seal lip 1 is sufficiently small, namely moves on on valve plug 3 and contacted with lip
Contact area is sufficiently small afterwards, and the driving force that maintenance shut-off valve closes or provides valve rod 8 required for shut-off valve opening in this way can
It greatly reduces.
In the present invention, the driving force that valve rod 8 passes to valve plug 3 only needs that the pressure between port 1 and port 2 17 can be overcome
The axial force that power difference acts on seal lip 1 and 3 contact area part of valve plug generates, so that it may guarantee that shut-off valve reliably closes
It closes, substantially reduces the driving force to valve rod 8 in this way, it is ensured that when valve rod 8 is by same driving force, shut-off valve quick closedown
And opening, no matter port 1 and port 2 17 are that positive differential pressure or Negative Pressure Difference do not affect reliably rapidly opening for shut-off valve
It closes, the operating pressure of shut-off valve latus rectum and shut-off valve also just can be substantially increased in the case where not increasing by 8 driving force of valve rod, it is real
Show and has directly driven being switched on and off for shut-off valve using the little electromagnet of power on automobile air spring.
Claims (10)
1. a kind of quick two-way shut-off valve, it is characterised in that: including valve body (6), end cap (15) and valve rod (8), the end cap
(15) it is fixed on valve body (6) top, the seal lip (1) protruded into valve body (6) is provided on the end cap (15)；The valve body
(6) it is movably set in for the valve plug (3) of upper chamber (13) and lower chamber (5), the valve plug will to be divided into inside valve body (6)
(3) stomata (12) of connection upper chamber (13) and lower chamber (5) is offered on, the valve rod (8) protrudes into valve from valve body (6) lower part
Body (6) is fixedly connected with valve plug (3), is provided with the port one (14) communicated with upper chamber (13), the end on the valve body (6)
The port two (17) communicated with upper chamber (13) is provided on lid (15)；Valve plug (3) and seal lip (1) cooperation control port one
(14) on-off between port two (17).
2. quick two-way shut-off valve as described in claim 1, it is characterised in that: be provided in the valve body (6) for valve
The limited step (19) of (3) limit is filled in, the pilot hole that guidance valve plug (3) moves up and down is formed with below the limited step (19)
(10), the port one (14) is located above limited step (19).
3. quick two-way shut-off valve as claimed in claim 2, it is characterised in that: the diameter and sealing lip of the pilot hole (10)
The central diameter of mouth (1) is identical.
4. quick two-way shut-off valve as claimed in claim 2, it is characterised in that: between the valve plug (3) and pilot hole (10)
It is provided with balanced seal circle (4).
5. quick two-way shut-off valve as claimed in claim 2, it is characterised in that: be provided with limit on the limited step (19)
Buffer stopper (11).
6. the quick two-way shut-off valve as described in any one of claim 1-5, it is characterised in that: set on the end cap (15)
Be equipped with outer diameter extending portion compatible with valve body (6) internal diameter, the lower end outer diameter of the extending portion is gradually reduced, with extending portion in
Cone seal lip (1) is formed when diameter is close.
7. quick two-way shut-off valve as described in claim 1, it is characterised in that: be inlaid on the upper surface of the valve plug (3)
Sealing ring (2), the sealing ring (2) are located at the underface of seal lip (1).
8. the quick two-way shut-off valve as described in any one of claim 1,2,3,4,5 or 7, it is characterised in that: the valve rod
(8) it is arranged on constant force spring (9), the constant force spring (9) is located at below the valve plug (3) in valve body (6).
9. quick two-way shut-off valve as described in claim 1, it is characterised in that: the end cap (15) and valve body (6) pass through tightly
Fixing bolt (16) connection, and sealing ring (18) are provided between end cap (15) and valve body (6).
10. quick two-way shut-off valve as described in claim 1, it is characterised in that: set between the valve body (6) and valve rod (8)
It is equipped with valve stem packing ring (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610491080.4A CN105972226B (en) | 2016-06-29 | 2016-06-29 | Quick two-way shut-off valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610491080.4A CN105972226B (en) | 2016-06-29 | 2016-06-29 | Quick two-way shut-off valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105972226A CN105972226A (en) | 2016-09-28 |
| CN105972226B true CN105972226B (en) | 2018-12-04 |
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ID=57019561
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610491080.4A Active CN105972226B (en) | 2016-06-29 | 2016-06-29 | Quick two-way shut-off valve |
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| Country | Link |
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| CN (1) | CN105972226B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979352A (en) * | 2017-04-12 | 2017-07-25 | 圣博莱阀门有限公司 | The high temperature orbit ball valve used in molecular sieve device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2424332Y (en) * | 2000-03-18 | 2001-03-21 | 李伟琴 | Self-pressuring stop valve |
| CN101634367A (en) * | 2008-07-25 | 2010-01-27 | 北京天龙万安科技发展有限公司 | Pilot-operated high-pressure stop valve |
| US8474786B2 (en) * | 2010-05-24 | 2013-07-02 | Emerson Process Management Regulator Technologies, Inc. | Valve stem and valve plug apparatus for use with fluid regulators |
| JP5860429B2 (en) * | 2013-03-29 | 2016-02-16 | 株式会社鷺宮製作所 | Flow control valve |
| CN203335890U (en) * | 2013-07-04 | 2013-12-11 | 浙江三花股份有限公司 | Piston electromagnetic valve |
| CN205806499U (en) * | 2016-06-29 | 2016-12-14 | 四川立地车辆底盘科技有限公司 | A kind of quickly two-way shut-off valve |
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2016
- 2016-06-29 CN CN201610491080.4A patent/CN105972226B/en active Active
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| Publication number | Publication date |
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| CN105972226A (en) | 2016-09-28 |
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