CN106168447A - Multiple stage intermediate frequency furnace and switch board heat exchange water centralized cycle chiller - Google Patents
Multiple stage intermediate frequency furnace and switch board heat exchange water centralized cycle chiller Download PDFInfo
- Publication number
- CN106168447A CN106168447A CN201610736018.7A CN201610736018A CN106168447A CN 106168447 A CN106168447 A CN 106168447A CN 201610736018 A CN201610736018 A CN 201610736018A CN 106168447 A CN106168447 A CN 106168447A
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- Prior art keywords
- water
- cooling
- cold water
- intermediate frequency
- heat exchange
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/06—Spray nozzles or spray pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
- F27D2009/001—Cooling of furnaces the cooling medium being a fluid other than a gas
- F27D2009/0013—Cooling of furnaces the cooling medium being a fluid other than a gas the fluid being water
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a kind of multiple stage intermediate frequency furnace and switch board heat exchange water centralized cycle chiller, row's intermediate frequency furnace and the switch board used including cross wedge rolling production line a plurality of in workshop, it is characterized in that: every described intermediate frequency furnace and the cold water inlet pipe of switch board access water cooling pond outside workshop by cold water input house steward and cold water front pump, input water cooling pond after water delivery pipe confluxes after heat exchange；Be provided with cooling tower in the upside of cooling pond, cooling tower water inlet pipe connects heat-exchanging water front pump, and the suction inlet of heat-exchanging water front pump connects float-type suction inlet by telescoping tube, and the cooling water outlet tube of cooling tower accesses cooling pond；This chiller, owing to using a cooling tower to be 18 24 intermediate frequency furnaces and switch board cooling, so great amount of investment can be saved, and it is not take up floor space, improve workshop utilization rate, the cooling effect that improve cooling tower, the temperature that guarantees water cooling pond are room temperature, so that it is guaranteed that to intermediate frequency furnace and the cooling effect of switch board.
Description
Technical field
The present invention relates to multiple stage intermediate frequency furnace and switch board heat exchange water that a kind of a plurality of cross wedge rolling production line is used
The improvement of chiller, a kind of multiple stage intermediate frequency furnace that a plurality of cross wedge rolling production line is used and switch board
Corresponding multiple heat exchange water chillers, change multiple stage intermediate frequency furnace and switch board that a plurality of cross wedge rolling production line is used into
Corresponding multiple heat exchange water chillers only use a chiller thus simplify chiller, reduce the multiple stage invested
Intermediate frequency furnace and switch board heat exchange water centralized cycle chiller.It is applicable to the water of medium above cross wedge rolling manufacturing enterprise
Chiller.
Background technology
Medium above cross wedge rolling manufacturing enterprise, has more than 4 cross wedge rolling production lines mostly, every cross wedge rolling production line,
In addition to a cross wedge rolling machine, also to join an intermediate frequency furnace, a switch board, due to intermediate frequency furnace and switch board domestic demand
Cold water to be passed through cools down, so to be also equipped with a cooling tower, each cooling tower also will be corresponding to being equipped with water circulating pump and cold
Water tank.Such as our company, existing 19 cross wedge rollings production production line, corresponding 19 intermediate frequency furnaces and 19 switch boards, each
Platform intermediate frequency furnace and switch board are reconfigured at a closed cooling tower and water circulating pump thereof and cold water storage cistern, so whole workshop
19 closed cooling towers and water circulating pump thereof and cold water storage cistern need to be configured.This cross wedge rolling manufacturing enterprise use intermediate frequency furnace and
The deficiency of switch board heat exchange water chiller is: one is that quantity is many, area occupied big, causes workshop crowded, confusing,
Reduce workshop utilizes area；Two is that structure is complicated, repeated plant is many, increases investment.
Summary of the invention
It is an object of the invention to provide one can expand workshop utilize area, simplify structure, reduce investment, use more
Add convenient multiple stage intermediate frequency furnace and switch board heat exchange water centralized cycle chiller.
In order to reach object above, the technical solution adopted in the present invention is: this multiple stage intermediate frequency furnace and switch board heat
Exchanged water centralized cycle chiller, the row's intermediate frequency furnace used including cross wedge rolling production line a plurality of in workshop, every
Intermediate frequency furnace is mounted side by side a switch board, is equipped with and stove internal coiling cooling tube entrance point pair on every intermediate frequency furnace
Water delivery pipe after the cold water inlet pipe connect and the heat exchange docked with the stove internal coiling cooling tube port of export；In like manner, at every switch board
On be equipped with in cabinet in chiller cold water inlet pipe and cabinet water delivery pipe after chiller heat exchange；It is characterized in that: described
In cold water inlet pipe on every intermediate frequency furnace and the cabinet on every corresponding switch board, chiller cold water inlet pipe is simultaneously
Input house steward connects with cold water, and cold water input house steward is connected with cold water input delivery side of pump by manometer tube, cold water front pump
Suction inlet is accessed in the cold water of the water cooling pond outside workshop by cold water suction pipe；After the described heat exchange on every intermediate frequency furnace
In cabinet on water delivery pipe and every corresponding switch board after chiller heat exchange water delivery pipe simultaneously with heat exchange after water output total
Pipe connects, after heat exchange one end of water delivery trunk by water effuser after heat exchange access the water surface of cooling pond outside workshop with
Upper position, the bottom of described cooling pond is connected by communicating pipe with water cooling pond；The upside of described cooling pond is provided with cooling
Tower, cooling tower water inlet pipe connects heat-exchanging water front pump, and the suction inlet of heat-exchanging water front pump connects telescoping tube, and the end of telescoping tube connects floating
Minor suction inlet, the cooling water outlet tube of cooling tower accesses cooling pond.
The present invention implements also by following measure: the cold water that is provided with suitable for reading of described cooling tower supplements shower nozzle, and cold water supplements
Shower nozzle connects running water pipe；Described cold water supplements the electromagnetic valve switch of shower nozzle by communicating pipe entrance bottom wire and cooling pond
Temperature detect switch (TDS) Opposite direction connection, when the temperature bottom cooling pond does not drops to room temperature, temperature detect switch (TDS) close, now open cold water
Supplement the electromagnetic valve switch of shower nozzle, spray into cold water；Otherwise, when the temperature bottom cooling pond is reduced to room temperature, temperature detect switch (TDS)
Opening, now cold water supplements the electromagnetic valve switch closedown of shower nozzle, stops spraying into cold water, makes the water bottom cooling pond flow into simultaneously
In water cooling pond.
Described cooling tower suitable for reading in be provided with axial flow blower, the waist at cooling tower is provided with air intake grid；Described cooling
Swivelling-nozzle is arranged at the top of tower inner chamber, and the diapire at swivelling-nozzle is provided with nozzle under a row, with cold on the downside of the middle part of swivelling-nozzle
But tower water inlet pipe is in cooling tower vertical section is suitable for reading to be rotationally connected, with the axle head of axial flow blower on the upside of the middle part of swivelling-nozzle
It is rotationally connected by damping sleeve, when axial flow blower rotates, drives swivelling-nozzle to slowly run by the resistance of damping sleeve simultaneously,
It is also prevented from the vertical section that swivelling-nozzle is in cooling tower under the pressure of water upwardly away from cooling tower water inlet pipe suitable for reading, by rotation
Turn jet pipe and the lower nozzle of one row realizes rotating to get rid of to the water that temperature in entrance cooling tower is higher spilling, expand heat exchange area；Institute
Middle and upper part in the cooling tower stated is provided with two-layer grid, in order to improve heat exchange uniformity, and changes different interval flow velocity and stream
Dynamic state.
The side of described cooling pond is provided with overflow pipe.
Described cooling tower, cooling pond, water cooling pond are each provided at the north side in workshop, avoid sunlight；Cooling tower and heat-exchanging water
Front pump is arranged on the upside of cooling pond by cover plate.
Described intermediate frequency furnace and corresponding switch board have 18 24, it is adaptable to medium-sized cross wedge rolling manufacturing enterprise.
Described damping sleeve uses abrasives to make.
For large-scale cross wedge rolling manufacturing enterprise, it is used as by the cooling capacity present invention increasing cooling tower.
The beneficial effects of the present invention is: this multiple stage intermediate frequency furnace and switch board heat exchange water centralized cycle cooling dress
Put, compared with every intermediate frequency furnace in the original a plurality of cross wedge rolling production line used and the corresponding cooling tower of switch board, by
In using cooling tower to be 18 24 intermediate frequency furnaces 1 and corresponding switch board 2 cools down, thus eliminate 17 23 cold
But tower, can reduce investment outlay more than 100 ten thousand yuan；Owing to whole cooling tower, pond are all built in beyond workshop, so being not take up face, workshop
Long-pending, improve workshop utilization rate；Air-cooled owing to both using, use again water-cooled, so improve the cooling effect of cooling tower；And
Add attemperating unit, it is ensured that the temperature of water cooling pond is room temperature, so that it is guaranteed that to intermediate frequency furnace and the cooling effect of switch board.
Accompanying drawing explanation
Fig. 1 is the plane arrangement structure schematic top plan view of invention.
Fig. 2 is the construction cooling tower office section view enlarged diagram of invention.
Detailed description of the invention
Embodiment 1
Fig. 1, Fig. 2 give the present invention embodiment in our company, make the present invention with reference to Fig. 1, Fig. 2.In our company now
There are 19 cross wedge rolling production lines, corresponding 19 intermediate frequency furnaces and 19 switch boards.This multiple stage intermediate frequency furnace and switch board heat
Exchanged water centralized cycle chiller, 19 intermediate frequency furnaces 1 used including interior 19 the cross wedge rolling production lines in workshop 28, often
Platform intermediate frequency furnace 1 is mounted side by side a switch board 2, is equipped with and enters with stove internal coiling cooling tube on every intermediate frequency furnace 1
Water delivery pipe 4 after the cold water inlet pipe 3 of mouthful end docking and the heat exchange docked with the stove internal coiling cooling tube port of export, by cold water stream
Cross stove internal coiling cooling tube and carry out heat exchange, it is achieved to descent of temperature, the heat exchange water in spiral cooling tube is risen simultaneously
Temperature；In like manner, every switch board 2 is equipped with in cabinet in chiller cold water inlet pipe 5 and cabinet water after chiller heat exchange defeated
Going out pipe 6, in flowing through cabinet by cold water, chiller carries out heat exchange, it is achieved lower the temperature in cabinet；It is characterized in that: described every
In cold water inlet pipe 3 on intermediate frequency furnace 1 and the cabinet on corresponding every switch board 2, chiller cold water inlet pipe 5 is simultaneously
Input house steward 7 connects with cold water, and cold water input house steward 7 is connected with the outlet of cold water front pump 9 by manometer tube 8, and cold water inputs
The suction inlet of pump 9 accesses in the cold water of the water cooling pond 11 outside workshop 28 by cold water suction pipe 10, by starting cold water front pump 9
The cold water of water cooling pond 11 is squeezed into cold water input house steward 7, and the cooling being redistributed in each intermediate frequency furnace 1 and switch board 2 fills
In putting；Cooling in cabinet on every switch board 2 of water delivery pipe 4 and correspondence after the described heat exchange on every intermediate frequency furnace 1
After device heat exchange, water delivery pipe 6 connects with water delivery trunk 12 after heat exchange simultaneously, and after heat exchange, one end of water delivery trunk 12 is passed through
After heat exchange, water effuser 13 accesses the above position of the water surface of the cooling pond 14 outside workshop 28, the bottom of described cooling pond 14
With water cooling pond 11 by connecting communicating pipe 15, so, the water warp after each intermediate frequency furnace 1 and Ge Tai switch board 2 heat exchange
Flowing into cooling pond 14 after water delivery trunk 12 collects after heat exchange, carry out heat exchange in cooling pond 14, temperature is down to room temperature
After, then by flowing into communicating pipe 15 in water cooling pond 11, recycle；The upside of described cooling pond 14 is provided with cooling tower 16,
Cooling tower water inlet pipe 17 connects heat-exchanging water front pump 18, and the suction inlet of heat-exchanging water front pump 18 connects telescoping tube 19, telescoping tube 19
End connects float-type suction inlet 20, and the cooling water outlet tube 21 of cooling tower 16 accesses cooling pond 14, due to water effuser 13 after heat exchange
Flow out is hot water, and proportion is relatively light, so on the upper strata of cooling pond 14, inhaling through float-type by starting heat-exchanging water front pump 18
Water higher for upper strata, cooling pond 14 temperature is squeezed in cooling tower 16 by mouth 20, and the water after cooling in cooling tower 16 flows again
Enter the upper strata of cooling pond 14, through continuous circulating cooling, the water in cooling pond 14 can be made to be down to room temperature, be down to the water of room temperature
Lower floor in cooling pond 14；Owing to have employed float-type suction inlet 20, so no matter how the water level in cooling pond 14 changes,
The always upper water in suction cooling pond 14.
Improvement as the present invention: the cold water that is provided with suitable for reading of described cooling tower 16 supplements shower nozzle 22, and cold water supplements shower nozzle
22 connect running water pipe 23, make cold water supplement shower nozzle 22 automatic water jetting, due to following at water by the pressure in running water pipe 23
In ring cooling procedure, water has a certain amount of consumption, so, the water spray of shower nozzle 22 can be supplemented by cold water and realize supplementing of water, with
Shi Shixian water-cooled；Described cold water is supplemented the electromagnetic valve switch 24 of shower nozzle 22 and is entered communicating pipe 15 bottom cooling pond 14 by wire
Temperature detect switch (TDS) 25 Opposite direction connection of mouth, when the temperature bottom cooling pond 14 does not drops to room temperature, temperature detect switch (TDS) 25 cuts out, now
Open cold water and supplement the electromagnetic valve switch 24 of shower nozzle 22, spray into cold water；Otherwise, the temperature bottom cooling pond 14 is reduced to often
Wen Shi, temperature detect switch (TDS) 25 opens, and now cold water supplements the electromagnetic valve switch 24 of shower nozzle 22 and closes, and stops spraying into cold water, makes simultaneously
Water bottom cooling pond 14 flows in water cooling pond 11.
Described cooling tower 16 suitable for reading in be provided with axial flow blower 161, the waist at cooling tower 16 is provided with air intake grid 162,
Realize air-cooled by the outside air inducing of axial flow blower 161 and air intake grid 162 air intake, so carried out with water-cooled by air-cooled simultaneously, carry
The cooling effect of high cooling tower 16；There is swivelling-nozzle 163 on the top of described cooling tower 16 inner chamber, at the end of swivelling-nozzle 163
Wall is provided with nozzle 164 under a row, and be in cooling tower 16 with cooling tower water inlet pipe 17 on the downside of the middle part of swivelling-nozzle 163 is vertical
Section is suitable for reading to be rotationally connected, and on the upside of the middle part of swivelling-nozzle 163, the axle head with axial flow blower 161 is rotationally connected by damping sleeve 27,
When axial flow blower 161 rotates, drive swivelling-nozzle 163 to slowly run by the resistance of damping sleeve 27 simultaneously, be also prevented from rotating
The vertical section that jet pipe 163 is in cooling tower 16 upwardly away from cooling tower water inlet pipe 17 under the pressure of water is suitable for reading, by rotating
Jet pipe 163 and the lower nozzle 164 of one row realize rotating to get rid of to the water that temperature in entrance cooling tower 16 is higher spilling, and expand heat-exchange surface
Long-pending；The described middle and upper part in cooling tower 16 is provided with two-layer grid 165, in order to improve heat exchange uniformity, and changes different interval
Flow velocity and flow regime.
The side of described cooling pond 14 is provided with overflow pipe 26.
Described cooling tower 16, cooling pond 14, water cooling pond 11 are each provided at the north side in workshop 27, avoid sunlight；Cooling tower
16 and heat-exchanging water front pump 18 be arranged on the upside of cooling pond 14 by cover plate.
Described damping sleeve 27 uses abrasives to make.
Proved by enforcement: after using the present invention, used 18 cooling towers, each cooling tower 70,000 yuan less, investment can be reduced
1260000 yuan；Taking floor space 530 squares less, workshop utilization rate improves 13.3%.
Claims (3)
1. multiple stage intermediate frequency furnace and switch board heat exchange water centralized cycle chiller, including a plurality of cross wedge rolling in workshop (28)
Row's intermediate frequency furnace (1) that production line is used, every intermediate frequency furnace (1) is mounted side by side a switch board (2), at every
The cold water inlet pipe (3) docked with stove internal coiling cooling tube entrance point and cold with stove internal coiling it is equipped with on intermediate frequency furnace (1)
But water delivery pipe (4) after the heat exchange of pipe port of export docking；In like manner, in being equipped with cabinet on every switch board (2), chiller is cold
Water delivery pipe (6) after chiller heat exchange in water inlet pipe (5) and cabinet；It is characterized in that: described every intermediate frequency furnace (1)
On cold water inlet pipe (3) and cabinet on corresponding every switch board (2) in chiller cold water inlet pipe (5) simultaneously and cold water
Input house steward (7) connection, cold water input house steward (7) is connected with the outlet of cold water front pump (9) by manometer tube (8), and cold water is defeated
In the cold water of the water cooling pond (11) that the suction inlet entering pump (9) accesses outside, workshop (28) by cold water suction pipe (10)；Described is every
Chiller heat exchange in cabinet on every switch board (2) of water delivery pipe (4) and correspondence after heat exchange on platform intermediate frequency furnace (1)
Rear water delivery pipe (6) connects with water delivery trunk (12) after heat exchange simultaneously, and after heat exchange, one end of water delivery trunk (12) is by changing
After heat, water effuser (13) accesses the above position of the water surface of the cooling pond (14) in outside, workshop (28)；Described cooling pond (14)
Bottom and water cooling pond (11) by connecting communicating pipe (15)；The upside of described cooling pond (14) is provided with cooling tower (16),
Cooling tower water inlet pipe (17) connects heat-exchanging water front pump (18), and the suction inlet of heat-exchanging water front pump (18) connects telescoping tube (19), stretches
The end of the draw (19) connects float-type suction inlet (20), and the cooling water outlet tube (21) of cooling tower (16) accesses cooling pond (14).
Multiple stage intermediate frequency furnace the most according to claim 1 and switch board heat exchange water centralized cycle chiller, it is special
Levying and be: the cold water that is provided with suitable for reading of described cooling tower (16) supplements shower nozzle (22), cold water supplements shower nozzle (22) and connects tap water
Pipe (23)；Described cold water supplements the electromagnetic valve switch (24) of shower nozzle (22) by wire and cooling pond (14) bottom communicating pipe
(15) temperature detect switch (TDS) (25) Opposite direction connection of entrance, when the temperature of cooling pond (14) bottom does not drops to room temperature, temperature detect switch (TDS)
(25) close, now open cold water and supplement the electromagnetic valve switch (24) of shower nozzle (22), spray into cold water；Otherwise, work as cooling pond
(14), when the temperature of bottom is reduced to room temperature, temperature detect switch (TDS) (25) is opened, and now cold water supplements the electromagnetic valve switch of shower nozzle (22)
(24) close, stop spraying into cold water, make the water of bottom, cooling pond (14) flow in water cooling pond (11) simultaneously.
Multiple stage intermediate frequency furnace the most according to claim 1 and 2 and switch board heat exchange water centralized cycle chiller, its
Be characterised by: described cooling tower (16) suitable for reading in be provided with axial flow blower (161), the waist at cooling tower (16) is provided with air intake
Grid (162)；Swivelling-nozzle (163) is arranged at the top of described cooling tower (16) inner chamber, and the diapire at swivelling-nozzle (163) is provided with one
The lower nozzle (164) of row, be in cooling tower (16) with cooling tower water inlet pipe (17) on the downside of the middle part of swivelling-nozzle (163) is vertical
Section is suitable for reading to be rotationally connected, and on the upside of the middle part of swivelling-nozzle (163), the axle head with axial flow blower (161) is rotated by damping sleeve (27)
Connect；The described middle and upper part in cooling tower (16) is provided with two-layer grid (165).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610736018.7A CN106168447B (en) | 2016-08-29 | 2016-08-29 | More intermediate frequency furnaces and switch board heat exchange water centralized cycle cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610736018.7A CN106168447B (en) | 2016-08-29 | 2016-08-29 | More intermediate frequency furnaces and switch board heat exchange water centralized cycle cooling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106168447A true CN106168447A (en) | 2016-11-30 |
| CN106168447B CN106168447B (en) | 2018-06-29 |
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ID=57376669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610736018.7A Active CN106168447B (en) | 2016-08-29 | 2016-08-29 | More intermediate frequency furnaces and switch board heat exchange water centralized cycle cooling device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106168447B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108134324A (en) * | 2017-12-19 | 2018-06-08 | 江苏宜源电力设备有限公司 | A kind of multipurpose high-pressure bottle cabinet |
| CN109676114A (en) * | 2019-02-25 | 2019-04-26 | 四川福蓉科技股份公司 | A kind of aluminium bar casting recirculated water thermostatic control system and method |
| CN113310316A (en) * | 2021-05-31 | 2021-08-27 | 中天钢铁集团有限公司 | Bar sample heating device and operation method thereof |
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| Publication number | Publication date |
|---|---|
| CN106168447B (en) | 2018-06-29 |
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