CN107270318A - A kind of driving structure of high-temperature flue gas baffle door - Google Patents
A kind of driving structure of high-temperature flue gas baffle door Download PDFInfo
- Publication number
- CN107270318A CN107270318A CN201710370803.XA CN201710370803A CN107270318A CN 107270318 A CN107270318 A CN 107270318A CN 201710370803 A CN201710370803 A CN 201710370803A CN 107270318 A CN107270318 A CN 107270318A
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- CN
- China
- Prior art keywords
- baffle door
- power transmission
- transmission shaft
- flue gas
- temperature flue
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/08—Doors or covers specially adapted for smoke-boxes, flues, or chimneys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power-Operated Mechanisms For Wings (AREA)
Abstract
The invention discloses a kind of driving structure of high-temperature flue gas baffle door, it is intended to solves gas baffle door drive mechanism and opens and closes during baffle door that stationarity and reliability be not good, total weight is big, and heat-resisting ability is poor, the not good deficiency of moment of torsion transmission.The invention includes the power transmission shaft that two ends are arranged on housing, is connected to two rotating shafts at power transmission shaft two ends, rocking arm is fastenedly connected on power transmission shaft; drive link is hinged on rocking arm, drive link is hinged baffle door, and power transmission shaft is hollow tubular structures; rotating shaft is axially arranged with passage; passage is connected with power transmission shaft inner chamber, rotating shaft ventilation outer end of hole connection inlet suction port, another rotating shaft ventilation outer end of hole connection air outlet adapter; power transmission shaft outer wall is set with heat-insulation layer, and inlet suction port blasts cooling gas；It is all connected with driving in rotating shaft on rocking handle, driving rocking handle and is hinged hydraulic cylinder piston rod, baffle door upper end is rotatably hung on housing.
Description
Technical field
The present invention relates to a kind of gas baffle door, more specifically, it relates to a kind of driving knot of high-temperature flue gas baffle door
Structure.
Background technology
Integrated gas-steam combined cycle power plant technology has generating efficiency height, environmental protection is good, the method for operation is flexible, build
Many advantages, such as cycle is short, is widely used in the world.Gas baffle door is that the key of Gas-steam Combined Cycle power plant is set
Standby, it couples gas turbine and waste heat boiler, play regulation unit flexibly run, quick start-stop, the effect such as safeguard protection.In work
Need gas baffle door being turned on and off during work, this action is typically realized by driving structure, but turn at present
The applicable temperature of axle is mostly below 600 degrees Celsius.With the continuous upgrading of combustion engine, the temperature and flow of flue gas are improved constantly,
The delivery temperature of current 9HA grades of combustion engine state-of-the-art in the world is close to 700 degrees Celsius, and the structure of existing gas baffle door is not
It can meet that temperature is higher, flow bigger, Flow Field Distribution is more complicated, the worse working condition of working environment.Matched cigarette
Gas baffle door, its power transmission shaft should transmit bigger moment of torsion, and higher temperature is adapted to again, and weight is also as far as possible small, with
Reduce cost.And traditional driving structure weight is big, heat-resisting ability is poor, and moment of torsion transmission is not good, and driving structure is opened and closed
Stationarity and reliability be not good during baffle door.
Chinese patent notification number CN104197350B, discloses a kind of gas baffle door drive mechanism, including be arranged at three
The front support seat of logical housing forward end and the rear support seat for being arranged at three-way body rear end, front support seat and rear support seat are coaxially set
Put, be rotatably connected on front support seat on front axle, rear support seat and be rotatably connected to rear axle, both front axle, rear axle connection end are stretched
Enter in three-way body, torque tube two ends are respectively fixedly connected with rear axle, front axle, and reversible deflector is welded with torque tube.Work
When the transmission device that is connected by preceding shaft end external force is delivered to front axle and transmitted successively by front axle to torque tube, on torque tube
Fixed reversible deflector can realize opening and closing operations.During this gas baffle door drive mechanism opens and closes baffle door
Stationarity and reliability be not good, and total weight is big, and heat-resisting ability is poor, and moment of torsion transmission is not good.
The content of the invention
Stationarity and reliability during instant invention overcomes gas baffle door drive mechanism opening and closing baffle door
Not good, total weight is big, and heat-resisting ability is poor, and moment of torsion transmits not good deficiency, and there is provided a kind of high-temperature flue gas baffle door
Driving structure, stationarity and good reliability during gas baffle door is opened and closed, total is lightweight, high temperature resistant
Ability is strong, and moment of torsion transmission effect is good.
In order to solve the above-mentioned technical problem, the present invention uses following technical scheme：A kind of driving of high-temperature flue gas baffle door
Structure, including two ends be arranged on housing power transmission shaft, be connected to two rotating shafts at power transmission shaft two ends, power transmission shaft tightens connected
Connect and drive link is hinged on rocking arm, rocking arm, drive link is hinged baffle door, power transmission shaft is hollow tubular structures, and rotating shaft is axially set
There is passage, passage is connected with power transmission shaft inner chamber, rotating shaft ventilation outer end of hole is connected outside inlet suction port, another rotating shaft passage
End connection air outlet adapter, power transmission shaft outer wall is set with heat-insulation layer, and inlet suction port blasts cooling gas；Driving is all connected with rotating shaft to shake
Hydraulic cylinder piston rod is hinged on handle, driving rocking handle, baffle door upper end is rotatably hung on housing.
When gas baffle door needs to be turned on and off, hydraulic cylinder works promote driving rocking handle to turn by hydraulic cylinder piston rod
Dynamic, so as to drive rotating shaft, power transmission shaft to rotate together, the rocking arm being connected on power transmission shaft rotates and promotes baffle plate by drive link
Door is rotated and is turned on and off.Cooling gas is blasted into passage by inlet suction port, cooling air enters power transmission shaft inner chamber, another
Exported after passage in one rotating shaft from air outlet adapter.Cooling gas is constantly blasted, and countershaft, power transmission shaft are cooled down, greatly
The big heat-resisting ability for improving rotating shaft and power transmission shaft, prevents metaboly.And power transmission shaft outer wall suit heat-insulation layer, have
The high temperature that effect keeps out outside is delivered on power transmission shaft, effectively improves the heat-resisting ability of power transmission shaft.The power transmission shaft weight of hollow-core construction
Amount is light.Power transmission shaft is by Driven by Hydraulic Cylinder, and driving force is big, and driving process is steadily reliable, and using double rotating shafts, patrilineal line of descent with only one son in each generation moving axis band
Motion rocker arm is rotated, and transmission process is more steady reliable.The driving structure of this gas baffle door is lightweight, and heat-resisting ability is strong,
Effectively prevent rotating shaft and power transmission shaft in the course of work and metaboly occur, moment of torsion transmission effect is good, gas baffle door open and
Stationarity and good reliability during closing.
Preferably, the both sides of driving rocking handle are mounted on the spacing pin for spacing driving rocking handle, two limits on housing
Position pin will drive rocking handle is spacing to be rotated in the range of 0-90 degree.Spacing pin is used for spacing driving rocking handle, so that indirectly spacing
Baffle door, and flue internal bypass side and boiler side are respectively mounted the limiting bracket for postive stop baffle door, spacing pin and spacing branch
Frame collective effect, prevents impact of the unstable air-flow to baffle door, eliminates the influence of alternate stress countershaft and power transmission shaft, simultaneously
Avoid baffle door aperture excessive, serve the double protection to equipment.
Preferably, baffle door upper end is hinged with flap seat, flap seat upper end is fastenedly connected support rail, and support rail is connected to
On housing.Baffle door is hinged on flap seat by upper end, and flap seat is fastenedly connected with support rail, the mistake that baffle door is opened and closed
Upper end is rotated around flap seat in journey, and baffle door entirely moving, and flap seat bears the gravity of baffle door, and power transmission shaft is substantially not by bending
Stress, is only acted on by pure torsion, prevents deformation of transmission shaft, substantially prolongs the life-span of power transmission shaft.
Preferably, baffle door upper end turned position is coaxially connected with rotating disk, rotating disk and connects rocking bar, rocking bar end is hinged
Drive link, drive link lower end connection valve position transmitter feedback rod.Rotating disk is driven to rotate together while baffle door is rotated, so that logical
Crossing rocking bar, drive link drives feedback rod to rotate, and the angle signal that feedback rod is turned over is converted into electric signal conveying by valve position transmitter
To control system.So as to grasp the angle that baffle door is turned in real time.
Preferably, position is mounted on travel switch above and below rocking bar, two travel switch phases differ 90 degree, shaken
Bar is rotated between two travel switches.Rocking bar is touched after travel switch during rotating, and control system control hydraulic cylinder stops
Only work, prevent baffle door to be turned on and off excess.
Preferably, power transmission shaft includes the changeover portion of centre and the linkage section at two ends, the pipe thickness of changeover portion, which is less than, to be connected
Connect on the pipe thickness of section, linkage section close to interlude end provided with reaming, transition chamfering be provided between reaming and linkage section inwall,
Close installation has bending resistance ring between reaming and changeover portion inwall, and rocking arm is connected on linkage section close to middle fragment position.Linkage section
Bending resistance ring is installed with changeover portion link position, the bending strength of link position is effectively increased.Being provided with for transition chamfering is beneficial to
The smooth outflow of cooling gas, while it is spacing to resist bending ring progress.The location and installation of bending resistance ring is easy in the setting of reaming.Changeover portion
Pipe thickness be less than linkage section pipe thickness, improve the contact area of power transmission shaft inwall and cooling gas, improve biography
The volume of moving axis inner chamber, is conducive to improving cooling effect, while alleviating the weight of power transmission shaft.
Preferably, being provided with reinforcing ring with rocking arm link position on power transmission shaft outer wall.Being provided with for reinforcing ring is beneficial to reduce
Local stress between rocking arm and power transmission shaft, improves the stress performance of power transmission shaft.
Preferably, baffle door includes skeleton and the heat-insulating shield installed in skeleton both sides, heat-insulating shield edge is respectively mounted
Have on the flexible metal sealing piece of two panels, housing and metal sealing piece is correspondingly provided with sealing gland seat, sealing gland seat is provided with two sealing gears
Plate, two panels metal sealing piece is connected on sealing baffle respectively.
Baffle door good heat-insulation effect, baffle door is in standard-sized sheet or closed positions, metal sealing piece and sealing baffle formation ring
Shape seals passage, and auxiliary blasts air with air blower and sealed, prevents flue gas from revealing, improve the thermal efficiency of unit.
Preferably, inlet suction port connects air blower by pipeline, air outlet adapter passes through pipeline joint noise reduction device.Pass through drum
Blower fan blasts air into power transmission shaft and cooled down, and cost is low, easy to operate, and airflow is fast, good cooling results.Muffler
It is provided with beneficial to the noise produced in reduction cooling gas flow process.
Preferably, being connected in the middle of driving rocking handle with rotating shaft, driving rocking handle two ends are hinged hydraulic cylinder piston rod.In
The symmetrically arranged two Hydraulic Cylinders driving rocking handle of the heart is rotated, and pushing course is more steady reliable.
Compared with prior art, the beneficial effects of the invention are as follows：The driving structure of gas baffle door is lightweight, high temperature resistant energy
Power is strong, effectively prevent rotating shaft and power transmission shaft in the course of work and metaboly occurs, moment of torsion transmission effect is good, and gas baffle door is opened
Stationarity and good reliability during opening and closing.
Brief description of the drawings
Fig. 1 is the external side view of the present invention；
Fig. 2 is the inner side elevational view of the present invention；
Fig. 3 is the front view of the present invention；
Fig. 4 is the attachment structure schematic diagram of the power transmission shaft of the present invention；
Fig. 5 is the attachment structure schematic diagram of the drive link of the present invention；
Fig. 6 is the attachment structure schematic diagram of the metal sealing piece of the present invention；
In figure：1st, power transmission shaft, 2, rotating shaft, 3, rocking arm, 4, drive link, 5, baffle door, 6, passage, 7, inlet suction port, 8, go out
Gas joint, 9, heat-insulation layer, 10, driving rocking handle, 11, hydraulic cylinder piston rod, 12, flap seat, 13, support rail, 14, rotating disk, 15, shake
Bar, 16, drive link, 17, valve position transmitter feedback rod, 18, travel switch, 19, changeover portion, 20, linkage section, 21, reaming, 22,
Transition chamfering, 23, bending resistance ring, 24, reinforcing ring, 25, skeleton, 26, heat-insulating shield, 27, metal sealing piece, 28, sealing gland seat, 29, close
Block plate, 30, air blower, 31, muffler, 32, spacing pin.
Embodiment
Below by specific embodiment, and with reference to accompanying drawing, technical scheme is further described specifically：
Embodiment：A kind of driving structure of high-temperature flue gas baffle door（Referring to accompanying drawing 1 to 6）, including two ends are on housing
It is fastenedly connected on power transmission shaft 1, two rotating shafts 2 for being connected to power transmission shaft two ends, power transmission shaft on rocking arm 3, rocking arm and is hinged driving company
Bar 4, drive link is hinged baffle door 5, and power transmission shaft is hollow tubular structures, and rotating shaft is axially arranged with passage 6, passage and transmission
Axle inner chamber is connected, rotating shaft ventilation outer end of hole connection inlet suction port 7, another rotating shaft ventilation outer end of hole connection air outlet adapter 8, transmission
Axle outer wall is set with heat-insulation layer 9, and inlet suction port blasts cooling gas；It is all connected with driving in rotating shaft on rocking handle 10, driving rocking handle and cuts with scissors
Hydraulic cylinder piston rod 11 is connect, baffle door upper end is rotatably hung on housing.It is connected in the middle of driving rocking handle with rotating shaft, drives rocking handle
Two ends are hinged hydraulic cylinder piston rod, and two hydraulic cylinder Central Symmetries are set.The both sides of rocking handle are driven to be mounted on being used on housing
The spacing pin 32 of spacing driving rocking handle, two spacing pins will drive rocking handle is spacing to be rotated in the range of 0-90 degree.On baffle door
End is hinged with flap seat 12, and flap seat upper end is fastenedly connected support rail 13, and support rail is connected on housing.Baffle door upper end is rotated
Position is coaxially connected with connection rocking bar 15 on rotating disk 14, rotating disk, and rocking bar end is hinged drive link 16, drive link lower end connection valve position
Transmitter feedback rod 17.Position is mounted on travel switch 18 above and below rocking bar, and two travel switch phases differ 90 degree, shaken
Bar is rotated between two travel switches.Power transmission shaft includes the changeover portion 19 of centre and the linkage section 20 at two ends, the tube wall of changeover portion
Thickness is less than the pipe thickness of linkage section, and changeover portion is identical with linkage section outside dimension.It is provided with linkage section close to interlude end
Reaming 21, is provided with transition chamfering 22, close installation has bending resistance between reaming and changeover portion inwall between reaming and linkage section inwall
Ring 23, rocking arm is connected on linkage section close to middle fragment position.Changeover portion and the docking of linkage section end are welded together.Outside power transmission shaft
On wall reinforcing ring 24 is provided with rocking arm link position.Inlet suction port connects air blower 30 by pipeline, and air outlet adapter passes through pipeline
Joint noise reduction device 31.Baffle door includes skeleton 25 and the heat-insulating shield 26 installed in skeleton both sides, and heat-insulating shield edge is respectively mounted
Have on the flexible metal sealing piece 27 of two panels, housing and metal sealing piece is correspondingly provided with sealing gland seat 28, sealing gland seat is close provided with two
Block plate 29, two panels metal sealing piece is connected on sealing baffle respectively.
When gas baffle door needs to be turned on and off, hydraulic cylinder works promote driving rocking handle to turn by hydraulic cylinder piston rod
Dynamic, so as to drive rotating shaft, power transmission shaft to rotate together, the rocking arm being connected on power transmission shaft rotates and promotes baffle plate by drive link
Door is rotated and is turned on and off.Cooling gas is blasted into passage by inlet suction port, cooling air enters power transmission shaft inner chamber, another
Exported after passage in one rotating shaft from air outlet adapter.Cooling gas is constantly blasted, and countershaft, power transmission shaft are cooled down, greatly
The big heat-resisting ability for improving rotating shaft and power transmission shaft, prevents metaboly.And power transmission shaft outer wall suit heat-insulation layer, have
The high temperature that effect keeps out outside is delivered on power transmission shaft, effectively improves the heat-resisting ability of power transmission shaft.The power transmission shaft weight of hollow-core construction
Amount is light.Power transmission shaft is by Driven by Hydraulic Cylinder, and driving force is big, and driving process is steadily reliable, and using double rotating shafts, patrilineal line of descent with only one son in each generation moving axis band
Motion rocker arm is rotated, and transmission process is more steady reliable.Drive rotating disk to rotate together while baffle door is rotated, by rocking bar, pass
Lever drives feedback rod to rotate, and the angle signal that feedback rod is turned over is converted into electric signal and is transported to control system by valve position transmitter
System, so as to grasp the angle that baffle door is turned in real time；Simultaneously can manual rotational angle adjustment disk, it would be desirable to which the angle turned over is set
Set, control system is according to the angle of setting, control valve position transmitter.When valve position, transmitters sense to baffle door goes to set angle
After degree, control system control hydraulic cylinder is stopped, so that baffle door is opened in set angle position.The process that rocking bar is rotated
In touch after travel switch, control system control hydraulic cylinder be stopped, prevent baffle door to be turned on and off excess.
Embodiment described above is a kind of preferably scheme of the present invention, not makees any formal to the present invention
Limitation, also has other variants and remodeling on the premise of without departing from the technical scheme described in claim.
Claims (10)
1. a kind of driving structure of high-temperature flue gas baffle door, it is characterized in that, including two ends are arranged on power transmission shaft on housing, respectively
It is connected to be fastenedly connected on rocking arm, rocking arm on two rotating shafts at power transmission shaft two ends, power transmission shaft and is hinged drive link, drive link is hinged
Baffle door, it is characterized in that, power transmission shaft is hollow tubular structures, and rotating shaft is axially arranged with passage, and passage connects with power transmission shaft inner chamber
It is logical, rotating shaft ventilation outer end of hole connection inlet suction port, another rotating shaft ventilation outer end of hole connection air outlet adapter, power transmission shaft outer wall suit
There is heat-insulation layer, inlet suction port blasts cooling gas；It is all connected with driving in rotating shaft on rocking handle, driving rocking handle and is hinged hydraulic cylinder piston
Rotatably hang on housing bar, baffle door upper end.
2. a kind of driving structure of high-temperature flue gas baffle door according to claim 1, it is characterized in that, rocking handle is driven on housing
Both sides be mounted on spacing pin for spacing driving rocking handle, two spacing pins will drive rocking handle spacing in 0-90 degree scopes
It is interior to rotate.
3. a kind of driving structure of high-temperature flue gas baffle door according to claim 1, it is characterized in that, baffle door upper end is hinged
There is flap seat, flap seat upper end is fastenedly connected support rail, and support rail is connected on housing.
4. a kind of driving structure of high-temperature flue gas baffle door according to claim 1, it is characterized in that, baffle door upper end is rotated
Position, which is coaxially connected with rotating disk, rotating disk, connects rocking bar, and rocking bar end is hinged drive link, drive link lower end connection valve position transmitter
Feedback rod.
5. a kind of driving structure of high-temperature flue gas baffle door according to claim 4, it is characterized in that, above and below rocking bar
Position is mounted on travel switch, and two travel switch phases differ 90 degree, and rocking bar is rotated between two travel switches.
6. a kind of driving structure of high-temperature flue gas baffle door according to claim 1 to 5 any one, it is characterized in that, pass
Moving axis includes the changeover portion of centre and the linkage section at two ends, and the pipe thickness of changeover portion is less than the pipe thickness of linkage section, connection
Be provided with reaming close to interlude end in section, be provided with transition chamfering between reaming and linkage section inwall, reaming and changeover portion inwall it
Between close installation have a bending resistance ring, rocking arm is connected on linkage section close to middle fragment position.
7. a kind of driving structure of high-temperature flue gas baffle door according to claim 1 to 5 any one, it is characterized in that, pass
On moving axis outer wall reinforcing ring is provided with rocking arm link position.
8. a kind of driving structure of high-temperature flue gas baffle door according to claim 1 to 5 any one, it is characterized in that, gear
Plate door includes skeleton and the heat-insulating shield installed in skeleton both sides, and heat-insulating shield edge is mounted on the flexible metal sealing of two panels
Sealing gland seat is correspondingly provided with piece, housing with metal sealing piece, sealing gland seat is provided with two sealing baffles, two panels metal sealing piece difference
It is connected on sealing baffle.
9. a kind of driving structure of high-temperature flue gas baffle door according to claim 1 to 5 any one, it is characterized in that, enter
Gas joint connects air blower by pipeline, and air outlet adapter passes through pipeline joint noise reduction device.
10. a kind of driving structure of high-temperature flue gas baffle door according to claim 1 to 5 any one, it is characterized in that, drive
Shake and be connected in the middle of handle with rotating shaft, driving rocking handle two ends are hinged hydraulic cylinder piston rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710370803.XA CN107270318B (en) | 2017-05-23 | 2017-05-23 | A kind of driving structure of high-temperature flue gas baffle door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710370803.XA CN107270318B (en) | 2017-05-23 | 2017-05-23 | A kind of driving structure of high-temperature flue gas baffle door |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107270318A true CN107270318A (en) | 2017-10-20 |
| CN107270318B CN107270318B (en) | 2019-02-26 |
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ID=60064826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710370803.XA Active CN107270318B (en) | 2017-05-23 | 2017-05-23 | A kind of driving structure of high-temperature flue gas baffle door |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107270318B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3626483A1 (en) * | 1986-08-05 | 1987-04-23 | Wet Waerme Energietechnik Gmbh | Chimney renewal insert |
| CN102022745A (en) * | 2009-09-16 | 2011-04-20 | 苏州新长光热能科技有限公司 | Novel open and close device of smoke evacuation pipe of aluminium cooling chamber |
| CN202227861U (en) * | 2011-08-04 | 2012-05-23 | 杭州杭锅通用设备有限公司 | Smoke baffle door driving transmission system |
| CN203421189U (en) * | 2013-07-26 | 2014-02-05 | 攀钢集团工程技术有限公司 | Counter weight type wind blockage valve |
| CN203704003U (en) * | 2013-11-28 | 2014-07-09 | 金荣森 | Desulfurization baffle door |
| TW201430289A (en) * | 2013-01-17 | 2014-08-01 | China Steel Corp | Waste gas suction device and cooling apparatus |
-
2017
- 2017-05-23 CN CN201710370803.XA patent/CN107270318B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3626483A1 (en) * | 1986-08-05 | 1987-04-23 | Wet Waerme Energietechnik Gmbh | Chimney renewal insert |
| CN102022745A (en) * | 2009-09-16 | 2011-04-20 | 苏州新长光热能科技有限公司 | Novel open and close device of smoke evacuation pipe of aluminium cooling chamber |
| CN202227861U (en) * | 2011-08-04 | 2012-05-23 | 杭州杭锅通用设备有限公司 | Smoke baffle door driving transmission system |
| TW201430289A (en) * | 2013-01-17 | 2014-08-01 | China Steel Corp | Waste gas suction device and cooling apparatus |
| CN203421189U (en) * | 2013-07-26 | 2014-02-05 | 攀钢集团工程技术有限公司 | Counter weight type wind blockage valve |
| CN203704003U (en) * | 2013-11-28 | 2014-07-09 | 金荣森 | Desulfurization baffle door |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107270318B (en) | 2019-02-26 |
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