CN109162763A - A kind of blade root locking notch structure - Google Patents
A kind of blade root locking notch structure Download PDFInfo
- Publication number
- CN109162763A CN109162763A CN201811048243.7A CN201811048243A CN109162763A CN 109162763 A CN109162763 A CN 109162763A CN 201811048243 A CN201811048243 A CN 201811048243A CN 109162763 A CN109162763 A CN 109162763A
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- China
- Prior art keywords
- slot
- latch segment
- fore shaft
- impeller
- limiting slot
- 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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
- F01D5/32—Locking, e.g. by final locking blades or keys
- F01D5/323—Locking of axial insertion type blades by means of a key or the like parallel to the axis of the rotor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The present invention provides a kind of blade root locking notch structures, belong to steam turbine equipment field, this blade root locking notch structure, including fore shaft final blage, impeller and latch segment；Impeller has fore shaft, and the extension slot extended to the axle center of impeller is provided at fore shaft；Fore shaft final blage has the root towards impeller axle center, and root is fixedly installed the extension with extension slot cooperation；Limiting slot is provided on extension, latch segment can be partially placed in limiting slot；The feed slot being connected to limiting slot is provided on impeller, latch segment can be partially placed in feed slot；Limiting slot and/or feed slot have the bearing surface for stopping the vertical limiting slot extending direction of latch segment to skid off.The centrifugal force of fore shaft final blage is passed on the impeller of fore shaft final blage two sides by latch segment and axially position pin, fore shaft final blage adjacent blades no longer share the centrifugal force of fore shaft final blage, to reduce the stress level of fore shaft final blage adjacent blades and corresponding impeller blade root position.
Description
Technical field
The present invention relates to steam turbine equipment fields, in particular to a kind of blade root locking notch structure.
Background technique
Because of impeller 1 and root of blade binding site radially face uniform force, in addition the raising of modern machining ability, bacterium
Shape leaf and root structure is widely used on steam turbine, especially most commonly seen in longer movable vane piece, using bacterium shape blade root
Movable vane piece, at least a piece of fore shaft final blage 2 of every level-one are corresponding that a last years fore shaft, mark are at least arranged on every grade of impeller 1
Quasi- blade is successively inserted radially into from last years fore shaft position, and being rotated further by impeller 1 has on the circumference of bacterium shape blade root, is finally inserted radially into
Fore shaft final blage 2, circumferentially swelling guarantee that whole circle movable vane piece is fitted closely with impeller 1, finally in fore shaft final blage 2 and last years
First adjacent blades 3 and the first adjacent blades of last years 3 and 4 faying face of the second adjacent blades of last years along axial drilling and squeeze into the junction of the edges of two sheets of paper
Pin 5.The effect of junction of the edges of two sheets of paper pin 5 is that the centrifugal force generated when rotating fore shaft final blage 2 passes to the first adjacent blades of last years 3 and end
The centrifugal force that the second adjacent blades of leaf 4, the first adjacent blades of last years 3 and the second adjacent blades of last years 4 again carry out the transmitting of junction of the edges of two sheets of paper pin 5
And the centrifugal force of their own passes to impeller 1 by bacterium shape blade root.
This structure that 2 centrifugal force of fore shaft final blage is transmitted by junction of the edges of two sheets of paper pin 5,2 centrifugal force of fore shaft final blage is to circumferential transmitting
Ability is poor, and the centrifugal force overwhelming majority of fore shaft final blage 2 is undertaken by the first adjacent blades of two panels 3 and to pass to them corresponding
Impeller 1, the other rule blade positions of stress ratio that this results in the first adjacent blades 3 and 1 binding site of impeller are much larger, bacterium shape
Blade root is also because this region of high stress problem can not use in longer movable vane piece.In addition, this transmit fore shaft by junction of the edges of two sheets of paper pin 5
The structure of 2 centrifugal force of final blage, when dynamic balancing or unit are run in rotor progress factory, in blade centrifugal force and vapor (steam) temperature
Under effect, 1 diameter of impeller can become larger, and fore shaft final blage 2 and adjacent blades circumferentially loosen, and 2 centrifugal force of fore shaft final blage compared with
Greatly, fore shaft final blage 2 relative to other rule blades can outside circular direction it is mobile, even if after rotor stops operating, fore shaft final blage 2
Also it can not be restored to original installation position, 2 relative standard's movable vane piece of fore shaft final blage is radially outer to move.In response to this, it makes
Making the common treating method of factory is: in factory after dynamic balancing or when unit maintenance, by the 8 outer circle protrusion of shroud of fore shaft final blage 2
Point polish off, this processing mode had both destroyed the original balance of rotor, can not also solve 2 steam flow channel of fore shaft final blage with
Rule blade steam flow channel problem of misalignment.After 8 outer circle of the shroud protrusion part of fore shaft final blage 2 polishes off, still it can not solve
The problem of shroud 8 of fore shaft final blage 2 protrude rule blade again when unit is run, movable vane top labyrinth clearance is by the lock that protrudes
The shroud 8 of mouth final blage 2 determines, will increase 9 gap of blade tip seal of other standard movable vane pieces in this way, increases gland leak-off amount,
Reduce Unit Economic performance.
Summary of the invention
The present invention provides a kind of blade root locking notch structures, it is intended to solve above-mentioned existing for blade root locking notch structure in the prior art
Problem.
The present invention is implemented as follows:
A kind of blade root locking notch structure, including fore shaft final blage, impeller and latch segment；
The impeller has fore shaft, and the extension slot extended to the axle center of the impeller is provided at the fore shaft；
The fore shaft final blage has the root towards the impeller axle center, and the root is fixedly installed and the extension
The extension of slot cooperation；
Limiting slot is provided on the extension, the latch segment can be partially placed in the limiting slot；The leaf
The feed slot being connected to the limiting slot is provided on wheel, the latch segment can be partially placed in the feed slot；
The limiting slot and/or the feed slot have the blocking latch segment, and vertically the limiting slot extending direction skids off
Bearing surface.
In an embodiment of the present invention, the limiting slot has the first end and the second end being oppositely arranged, institute
It states first end and is provided with the feed slot being connected to the limiting slot, the second end is provided with another and the limiting slot
The feed slot of connection.
In an embodiment of the present invention, the fore shaft final blage has corresponding with the two sides of the impeller the
It is each provided with the limiting slot with the second face, first face and second face on one side, accordingly in the impeller
Two sides is provided with the feed slot.
In an embodiment of the present invention, the limiting slot is dovetail groove.
In an embodiment of the present invention, the section of the latch segment is dove-tail form corresponding with the limiting slot.
In an embodiment of the present invention, the feed slot has close to the dovetail section of the limiting slot and far from described
The latch segment of limiting slot is packed into slot, and the section of the dovetail section is suitable with the limiting slot, and the latch segment is packed into the section of slot
For rectangle, the width that the latch segment is packed into the section of slot is more than or equal to the width of the latch segment.
In an embodiment of the present invention, it is provided in the feed slot for fixing the latch segment relative position
First fixing piece is provided with the second fixing piece with first fixing piece cooperation on the latch segment.
In an embodiment of the present invention, it is provided in the feed slot of the first end for fixing
The first fixing piece of latch segment relative position is stated, is also equipped in the feed slot of the second end for fixing
The first fixing piece of latch segment relative position is stated, is provided on the latch segment and is respectively cooperating with two first fixing pieces
Two the second fixing pieces.
It in an embodiment of the present invention, further include axially position pin, first fixing piece is fixed with the axial direction
The fixation hole of position pin cooperation, second fixing piece is the fixed hole cooperated with the axially position pin.
The beneficial effects of the present invention are: blade root locking notch structure provided by the invention, has the advantages that
1, the centrifugal force of fore shaft final blage passes to the impeller of fore shaft final blage two sides by latch segment and axially position pin
On, the centrifugal force of fore shaft final blage is no longer limited as being undertaken by the impeller of adjacent blades pitch, the leaf for keeping fore shaft final blage adjacent
The centrifugal force that piece is shared reduces.The centrifugal force of fore shaft final blage can be transmitted to longer segmental arc by the size by changing latch segment
Impeller on, the stress of the first adjacent blades of last years and impeller is it is also possible to drop to more low-level.
2, latch segment and impeller and fore shaft final blage conduit are fitted close, and when avoiding rotation, blade centrifugal force keeps fore shaft last
It is moved outside blade relative standard blade radial, causes whole circle blade circumferential direction mass unbalance, also avoid the shroud of fore shaft final blage convex
Wear movable vane piece blade tip seal out causes labyrinth clearance to increase after blade tip seal abrasion, and Unit Economic performance reduces.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention
Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram of blade root locking notch structure in the prior art；
Fig. 2 be in Fig. 1 A-A to cross-sectional view；
Fig. 3 is the cross-sectional view of B-B direction in Fig. 1；
Fig. 4 is the partial structural diagram of the fore shaft final blage part of blade root locking notch structure provided in an embodiment of the present invention；
Fig. 5 be in Fig. 4 C-C to cross-sectional view；
Fig. 6 is the partial structural diagram of blade root locking notch structure provided in an embodiment of the present invention.
Icon: 1- impeller；2- fore shaft final blage；The first adjacent blades of 3-；The second adjacent blades of 4-；5- junction of the edges of two sheets of paper pin；6- axis
To positioning pin；7- latch segment；8- shroud；9- blade tip seal；10- latch segment is packed into slot.
Specific embodiment
To keep the purposes, technical schemes and advantages of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to the present invention
The range of protection.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present invention of protection is sought, but is merely representative of selected embodiment of the invention.Based on the embodiment in the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Invent the range of protection.
In the description of the present invention, it is to be understood that, indicating position or the term of positional relationship are based on shown in attached drawing
Orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than the equipment of indication or suggestion meaning
Or element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be on or below second feature
Directly contacted including the first and second features, also may include the first and second features be not direct contact but by them it
Between other characterisation contact.Moreover, fisrt feature is on second feature, top and above include fisrt feature second spy
Right above sign and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature second feature it
Under, lower section and fisrt feature included below be directly below and diagonally below the second feature, or be merely representative of first feature horizontal height
Less than second feature.
Embodiment
A kind of blade root locking notch structure is present embodiments provided, referring to Fig. 1, this blade root locking notch structure includes fore shaft last years
Piece 2, impeller 1 and latch segment 7；
The edge of impeller 1 is provided with the fore shaft entered for blade, specifically, fore shaft is a notch of impeller 1
Slot.Fore shaft final blage 2 guarantees stabilization when steam turbine running for sealing fore shaft and being compacted other blades.
Impeller 1, which is provided with to the axle center of impeller 1 at fore shaft, continues the extension slot extended, and fore shaft final blage 2 has direction
The root in 1 axle center of impeller is fixedly installed the extension with extension slot cooperation, extension accommodating in the root of fore shaft final blage 2
In in extension slot.
Specifically, there is fixing seat in the centre of extension slot, it is provided with and fixes in the centre of the root of fore shaft final blage 2
The fixing groove of seat cooperation, by the cooperation of fixing groove and fixing seat so that fore shaft final blage 2 will not be to the side in two faces of impeller 1
To offset.
Limiting slot is provided on the extension of fore shaft final blage 2, latch segment 7 can be partially placed in limiting slot；Leaf
The feed slot being connected to limiting slot is provided on wheel 1, latch segment 7 can be partially placed in feed slot, other portions of latch segment 7
Position can accommodate and be fed in slot.
In the present embodiment, the limiting slot of fore shaft final blage 2 is symmetricly set on the two sides of fore shaft final blage 2.Fore shaft last years
Piece 2 has first face corresponding with the two sides of impeller 1 and the second face, and the first face and the second face are each provided with a limit
Slot is provided with feed slot on the two sides of impeller 1 accordingly.
In steam turbine running, fore shaft final blage 2 needs pullling for centripetal force to be just avoided that fore shaft final blage 2 is got rid of
Out.Since pervious 2 root of fore shaft final blage is directly arranged on fore shaft, centripetal force passes through the leaf adjacent with fore shaft final blage 2
Piece provides, so that the blade root of the first adjacent blades 3 bears very big blade centrifugal force.Under the influence of centrifugal force, fore shaft
It is moved outside 2 relative standard's blade radial of final blage, causes whole circle blade circumferential direction mass unbalance, radial outward movement makes fore shaft final blage 2
Shroud 8 protrude, the shroud 8 of protrusion wears movable vane piece blade tip seal 9 causes labyrinth clearance to increase after blade tip seal 9 is worn,
Unit Economic performance reduces.And by the setting of limiting slot, it can be directly that latch segment 7 provides pulling force by impeller 1, pass through lock
Tight block 7 is that fore shaft final blage 2 provides centripetal force, guarantees that the relative position of fore shaft final blage 2 is stablized, while also avoiding vapor wheel
Machine has an impact the blade of 2 side of fore shaft final blage when working.And the contact area of latch segment 7 and impeller 1 can pass through lock
Shape, the size of tight block 7 are controlled, and convenient for the dispersion of power, reduce the stress of local location.
In order to guarantee that latch segment 7 is placed in without skidding off in limiting slot, limiting slot has for stopping latch segment 7 vertically to limit
The bearing surface that position slot extending direction skids off.In the present embodiment, limiting slot is dovetail groove, and the bearing surface in opposite limiting slot is
For two inclined-planes opposite in dovetail groove.
In the present embodiment, feed slot is symmetricly set on the both ends of limiting slot.Limiting slot has the first end being oppositely arranged
Portion and the second end, first end are provided with the feed slot being connected to limiting slot, and the second end is provided with another and limiting slot
The feed slot of connection.
Setting in this way is accommodated in the intermediate position of latch segment 7 in limiting slot, and the both ends of latch segment 7
It is accommodated in the feed slot at limiting slot both ends, and then the power of fore shaft final blage 2 is allowed to pass on the impeller 1 of fore shaft two sides, reduce lock
1 Root Stress of movable vane piece and impeller near mouth final blage 2.
Since latch segment 7 and limiting slot are with the cooperation for being combined into dove-tail form, latch segment 7 cannot be directly placed into limiting slot
In, in the present embodiment, latch segment 7 slides into limiting slot from feed slot.
Being fed slot, there is the dovetail section close to limiting slot and the latch segment 7 far from limiting slot to be packed into slot, and latch segment 7 is packed into slot
Section be rectangle, latch segment 7 be packed into slot section width be more than or equal to latch segment 7 width.It can be packed into from latch segment 7
Latch segment 7 is sent into feed slot by slot, and then latch segment 7 can be slided in feed slot.
It is provided with the first fixing piece for 7 relative position of fixed locking block in feed slot, is provided on latch segment 7 and the
Second fixing piece of one fixing piece cooperation.
The first fixing piece for 7 relative position of fixed locking block is provided in the feed slot of first end, it is close
It is also equipped with the first fixing piece for 7 relative position of fixed locking block in the feed slot of the second end, is provided on latch segment 7
Two the second fixing pieces being respectively cooperating with two the first fixing pieces.
In the present embodiment, the first fixing piece is the fixation hole cooperated with axially position pin 6, and the second fixing piece is and axial direction
The fixed hole that positioning pin 6 cooperates.Fixed hole is passed through by axially position pin 6 and fixation hole makes latch segment 7 be fixed on leaf
On wheel 1.
Above-mentioned to refer to, the first face and the second face are provided with limiting slot, and the corresponding slot that is fed is also configured as symmetrical two,
Latch segment 7 is also configured as symmetrical two.Therefore the first fixing piece can be through-hole, and axially position pin 6 passes through 1 one side of impeller
Second fixing piece of latch segment 7, then passes through the first fixing piece, and be then then passed through the latch segment 7 of 1 another side of impeller second is solid
Determine part, then locking member is set on axially position pin 6.Two latch segments 7 may make to be fixedly mounted on impeller 1.
In the present embodiment, blade root is bacterial type blade root, in other embodiments, or other kinds of blade root, only
It wants that extension can be arranged, and limiting slot is conveniently set on extension.
The blade root locking notch structure provided through this embodiment, has the advantages that
1, the centrifugal force of fore shaft final blage 2 passes to 2 two sides of fore shaft final blage by latch segment 7 and axially position pin 6
On impeller 1, the centrifugal force of fore shaft final blage 2 is no longer limited as being undertaken by the impeller 1 of adjacent blades pitch, makes fore shaft final blage 2
The centrifugal force that adjacent blade is shared reduces.Size by changing latch segment 7 can transmit the centrifugal force of fore shaft final blage 2
Onto the impeller 1 of longer segmental arc, the stress of the first adjacent blades of last years 3 and impeller 1 is it is also possible to drop to more low-level.
2, latch segment 7 and impeller 1 and 2 conduit of fore shaft final blage are fitted close, and when avoiding rotation, blade centrifugal force makes fore shaft
It is moved outside 2 relative standard's blade radial of final blage, causes whole circle blade circumferential direction mass unbalance, also avoid enclosing for fore shaft final blage 2
Band 8 protrudes and wears movable vane piece blade tip seal 9, after blade tip seal 9 is worn, labyrinth clearance is caused to increase, Unit Economic performance drop
It is low.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of blade root locking notch structure, which is characterized in that including fore shaft final blage, impeller and latch segment；
The impeller has fore shaft, and the extension slot extended to the axle center of the impeller is provided at the fore shaft；
The fore shaft final blage has the root towards the impeller axle center, and the root is fixedly installed matches with the extension slot
The extension of conjunction；
Limiting slot is provided on the extension, the latch segment can be partially placed in the limiting slot；On the impeller
It is provided with the feed slot being connected to the limiting slot, the latch segment can be partially placed in the feed slot；
The limiting slot and/or the feed slot, which have, stops the latch segment vertically supporting of skidding off of the limiting slot extending direction
Junction.
2. blade root locking notch structure according to claim 1, which is characterized in that the limiting slot has first be oppositely arranged
End and the second end, the first end are provided with the feed slot being connected to the limiting slot, and the second end is provided with
Another feed slot being connected to the limiting slot.
3. blade root locking notch structure according to claim 1, which is characterized in that the fore shaft final blage has and the impeller
Corresponding first face in two sides and the second face, first face and second face be each provided with the limiting slot,
The feed slot is provided on the two sides of the impeller accordingly.
4. blade root locking notch structure according to claim 1, which is characterized in that the limiting slot is dovetail groove.
5. blade root locking notch structure according to claim 4, which is characterized in that the section of the latch segment is and the limit
The corresponding dove-tail form of slot.
6. blade root locking notch structure according to claim 3, which is characterized in that the feed slot has close to the limiting slot
Dovetail section and far from the limiting slot latch segment be packed into slot, the section of the dovetail section is suitable with the limiting slot, described
The section that latch segment is packed into slot is rectangle, and the width that the latch segment is packed into the section of slot is more than or equal to the width of the latch segment
Degree.
7. blade root locking notch structure according to claim 1, which is characterized in that be provided in the feed slot for fixing
The first fixing piece of latch segment relative position is stated, is provided on the latch segment and is fixed with the second of first fixing piece cooperation
Part.
8. blade root locking notch structure according to claim 2, which is characterized in that close to the feed slot of the first end
It is inside provided with the first fixing piece for fixing the latch segment relative position, in the feed slot of the second end
It is also equipped with the first fixing piece for fixing the latch segment relative position, is provided on the latch segment and two described
Two the second fixing pieces that one fixing piece is respectively cooperating with.
9. blade root locking notch structure according to claim 7, which is characterized in that further include axially position pin, described first is solid
Determining part is the fixation hole cooperated with the axially position pin, and second fixing piece is the fixation cooperated with the axially position pin
Through-hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811048243.7A CN109162763B (en) | 2018-09-10 | 2018-09-10 | Locking notch structure for mushroom-shaped blade root |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811048243.7A CN109162763B (en) | 2018-09-10 | 2018-09-10 | Locking notch structure for mushroom-shaped blade root |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109162763A true CN109162763A (en) | 2019-01-08 |
| CN109162763B CN109162763B (en) | 2021-05-18 |
Family
ID=64894476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811048243.7A Active CN109162763B (en) | 2018-09-10 | 2018-09-10 | Locking notch structure for mushroom-shaped blade root |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109162763B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB739870A (en) * | 1954-04-07 | 1955-11-02 | Parsons C A & Co Ltd | Improvements in and relating to locking devices for rotor blades of turbines and the like |
| CN101457657A (en) * | 2008-12-30 | 2009-06-17 | 东方电气集团东方汽轮机有限公司 | Axial positioning structure for firtree type blade root and blade |
| US20170306771A1 (en) * | 2016-04-20 | 2017-10-26 | Rolls-Royce Deutschland Ltd & Co Kg | Rotor with overhang at blades for a locking element |
-
2018
- 2018-09-10 CN CN201811048243.7A patent/CN109162763B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB739870A (en) * | 1954-04-07 | 1955-11-02 | Parsons C A & Co Ltd | Improvements in and relating to locking devices for rotor blades of turbines and the like |
| CN101457657A (en) * | 2008-12-30 | 2009-06-17 | 东方电气集团东方汽轮机有限公司 | Axial positioning structure for firtree type blade root and blade |
| US20170306771A1 (en) * | 2016-04-20 | 2017-10-26 | Rolls-Royce Deutschland Ltd & Co Kg | Rotor with overhang at blades for a locking element |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109162763B (en) | 2021-05-18 |
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