CN202146982U - Chamber crystallizer narrow-surface copper plate with a combined cooling water channel - Google Patents
Chamber crystallizer narrow-surface copper plate with a combined cooling water channel Download PDFInfo
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- CN202146982U CN202146982U CN201120136707U CN201120136707U CN202146982U CN 202146982 U CN202146982 U CN 202146982U CN 201120136707 U CN201120136707 U CN 201120136707U CN 201120136707 U CN201120136707 U CN 201120136707U CN 202146982 U CN202146982 U CN 202146982U
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Abstract
The utility model relates to the technical field of continuously casting a metal, especially relates to a chamber crystallizer narrow-surface copper plate with a combined cooling water channel. A working surface of the narrow-surface copper plate (1) comprises a planar area and an inclined area (2), wherein the planar area is arranged in the middle part of the working surface, the inclined area is arranged on the edge corner parts at the two sides, the length L of the straight line on the cross section of the inclined area (2) is 5-150mm, round and rectangular cooling water channels which are vertically perforated, are distributed in the narrow-surface copper plate along the height direction, 1-6 rectangular water channels (5) with width of 4-8mm and 1-6 round cooling water channels (6) with diameter of 5-10mm are distributed in the inclined area (2). The chamber design of the chamber crystallizer narrow-surface copper plate facilitates the optimization of the narrow-surface shape of the blank and the combined cooling water channel in the chamber is used for controlling the crack defect on the edge corner part of the micro-alloy steel and facilitates the prolonging of the service life of the narrow-surface copper plate.
Description
Technical field
The utility model relates to the continuous casting of metal field, specially refers to a kind of chamfering crystallizer narrow copper plate with combined type cooling water channel.
Background technology
In order to improve the market competitiveness, the many iron and steel enterprises of China all continually develop the variety steel of high added value on its slab or sheet blank continuous casting production line, especially produce the microalloying steel grade that contains elements such as niobium, vanadium, titanium.When casting this type steel grade, the mould at narrow copper coin generally adopts planar structure, the usually rectangular shape in strand bight.In crystallizer and secondary cooling zone, the strand bight is because with bidimensional type of cooling release heat, the cooling that therefore receives is stronger relatively; Its temperature is lower relatively; In the bending section or the aligning section of secondary cooling zone, the brittle zone scope that the surface temperature of strand in the bight very easily gets into micro alloyed steel causes a large amount of second tiny phase particles to occur; Such as carbon niobium nitride, titanium nitride etc., reduced the high temperature ductility of steel; Receive high tension more easily during the rectangular shape in strand bight in addition and concentrate, the factor of this two aspect is the basic reason that causes that transverse corner crack produces, and has limited the large-scale production of micro alloyed steel.
In order to solve the corners transverse crack problem of micro alloyed steel, the major measure of metallargist's employing at present comprises raising steel quality, optimization and stable covering slag performance, optimizes the process for cooling of secondary cooling zone etc.Only a few iron and steel enterprise has adopted the chamfering crystallizer technology, and this technological target is to make the original right angle of strand change two obtuse angles into, concentrates in order to the stress of eliminating the strand bight, reaches the purpose that improves the bight temperature simultaneously.
China utility model patent No.02214026.3 (notification number: CN 2547438Y; Title " the narrow limit of continuous casting crystallizer for plate billet copper coin ") a kind of crystallizer narrow copper plate with the side chamfering has been proposed; Its chamfer dimesion is 6～10mm; Angle is 45 degree, the design to the inner cooling structure of copper coin that this patent does not relate to.
China utility model patent No.200720089029.7 (publication number: CN 201132207Y; Title " a kind of plate slab crystallizer ") proposed a kind of narrow copper plate that has fillet surface, curved surface is an arc surface, and the radius of circular arc chamfering is 2～10mm; So its chamfering quantity not sufficient 10mm; The bight cooling leans on copper coin self heat conduction to realize that the shortcoming of this patent is that the chamfering amount is little, and the lifting amplitude of strand bight temperature is limited.
China's document " coupled thermal mechanical of bloom in the continuous cast mold " (literature reference: Chen Yong; Luo Xin, Shen Houfa. iron and steel .2008,43 (3); P33～37) narrow copper plate of crystallizer band side chamfering diabatic process and the stress distribution of base shell in bloom continuous casting production analyzed; The result shows: if the narrow copper plate of band side chamfering adopts bigger chamfering such as 25mm, angle is 45 degree, the strand heat transfer condition variation that crystallizer medial surface chamfering place is corresponding; Bight solidified shell temperature raises, the shell thickness attenuate, and causes the corner crack of strand thus; When the crystallizer chamfering diminished to 12mm, angle was 45 degree, can improve the heat transfer condition in strand bight, reduced solidified shell bight temperature, increased thickness of solidified slab shell in secondary, helped alleviating and prevented the strand corner crack.
Thus it is clear that, seldom relate to the cooling structure design problem in copper coin bight in the above-mentioned patent.Although and at present one of problem of existing of chamfering crystallizer is that the angle transverse fissure incidence of strand decreases,, reduced the technique effect of chamfering crystallizer because cooling deficiency in bight causes chamfering type strand to produce more angle lobe defective even bleed-out.For this reason, the utility model provides a kind of chamfering crystallizer narrow copper plate with rectangle combined type cooling duct.
Summary of the invention
The purpose of the utility model provides a kind of chamfering crystallizer narrow copper plate with combined type cooling duct, can control strand angle transverse fissure, prolongs the service life of narrow copper plate.
In order to achieve the above object, the utility model provides following technical scheme:
A kind of chamfering crystallizer narrow copper plate with combined type cooling water channel; Its working face comprises plane domain and chamfered region; Plane domain is positioned at the middle part; Chamfered region is positioned at the corners of both sides; Thickness difference H between copper coin cross-section center line place and the corners is 1.4～140mm, and chamfered region is connected so that tangent mode is smooth on cross-sectional direction with plane domain, and the straight length L of chamfered region on cross section is 5～150mm; Narrow copper plate inside is distributed with along the circle of short transverse up/down perforation and rectangle cooling water channel, wherein the inside of chamfered region rectangle cooling water channel and 1～6 circular cooling water channel that diameter is 5～10mm that to be distributed with 1～6 width be 4～8mm.
The width of said copper coin is 50～480mm; Highly be 700～1200mm, the plane domain copper plate thickness is 40～100mm, and its width is consistent on short transverse; Or plane domain width linear decrease from top to bottom, the stand out between copper coin upper limb and the lower edge is 0～4.0mm.
Said copper coin is a line of symmetry with the centre of surface line on width, is symmetrical distribution; On short transverse, its working face is a kind of in single tapering, double tapered or the many taperings.
The curve of said chamfered region on cross-sectional direction is that the one or more combination in broken line, circular arc line, hyperbola and the parabola forms.
The angle that curve and the side of said chamfered region on cross-sectional direction forms is 20～45 °.
At the chamfered region of said copper coin, the arrangement mode of rectangle cooling water channel and circular course is following any one:
(1) by forming near one or more rectangle cooling water channels of copper coin side and adjacent one or more circular cooling water channel;
(2) by forming near the one or more circular cooling water channel of copper coin side and adjacent one or more rectangle cooling water channels;
(3) form by a plurality of alternatively distributed circular cooling water channels and rectangle cooling water channel;
(4) form by one or more rectangle cooling water channels of one or more circular cooling water channels and its underpart.
Chamfered region in said copper coin both sides, the distance of cooling water channel and working face is 12～20mm on the cross section; And/or said copper coin side is 10～20mm apart from the distance B of nearest rectangle cooling water channel port.
The inner water channel of the plane domain of said narrow copper plate is that the circular cooling water channel of 5～10mm is formed by equally distributed rectangle cooling water channel and/or diameter.
Said copper coin has one of following characteristic at least:
I) nickel coating, ferronickel coating or nickel cobalt coating are arranged on the working face of said copper coin;
II) do not have overlay coating on the working face of said copper coin, the material of whole copper coin is a kind of in silver-bearing copper, chromium zirconium copper, phosphor-copper, the beryllium copper.
Compared with prior art; The strand corners of the disclosed narrow copper plate cast of the utility model converts inclined plane shape into by original right angle; The temperature of strand corners is higher and cross direction profiles is more even; The stress that receives in bending and the aligning process is littler, can effectively suppress the generation of strand transverse corner crack line, and help to prolong the service life of this copper coin.Behind the narrow copper plate set inside combined type cooling water channel, the essential cooling effect of strand corners can be guaranteed, and the longitudinal corner crack defective can be inhibited.
Description of drawings
Fig. 1 is the overall structure sketch map of the utility model first embodiment;
Fig. 2 a is the overall structure sketch map of the utility model second embodiment;
Fig. 2 b is the A-A vertical section sketch map of the utility model Fig. 2 a;
Fig. 3 is the cross-sectional structure sketch map of the utility model first embodiment or second embodiment;
Fig. 4 is the cross-sectional structure sketch map of the utility model the 3rd embodiment;
Fig. 5 is the cross-sectional structure sketch map of the utility model the 4th embodiment;
Fig. 6 is the cross-sectional structure sketch map of the utility model the 5th embodiment.
Reference numeral
1: the crystallizer narrow copper plate
2: chamfered region
3: the side
4: the curve of chamfered region on cross section
5: the rectangle cooling water channel
6: circular cooling water channel
H: the thickness difference between copper coin cross-section center line place and the corners
α: the curve of narrow copper plate working face chamfered region on cross-sectional direction and the angle of side formation
L: the straight length of narrow copper plate chamfered region on cross section
D: near the rectangle water channel port of narrow copper plate side distance apart from the side
The specific embodiment
According to accompanying drawing the utility model is described further below.
The narrow copper plate 1 that the utility model proposes is mainly used in the continuous casting production that thickness is 50～480mm strand, and conticaster is a straight arc or upright curved, and crystallizer is a combined type, and it is vertical structure on short transverse.This narrow copper plate 1 can make up with wide copper coin of funnel type crystallizer, also can make up with wide copper coin of parallel plate type crystallizer.On short transverse, the width of narrow copper plate can be consistent, also can the plane domain width linear decrease from top to bottom, the stand out between this moment copper coin upper limb and the lower edge is 0～4.0mm.When the width of narrow copper plate from top to bottom during linear decrease, strand forms back draught on thickness direction, help strengthening the cooling of strand bottom, improves slab surface quality.
Accompanying drawing 1 has provided the overall structure of narrow copper plate 1, and its working face contacts with molten steel, and working face is made up of the plane domain at middle part and the chamfered region 2 of both sides, and copper coin is single tapered configuration on short transverse.
Accompanying drawing 2a has provided the another kind of overall structure of narrow copper plate 1, and accompanying drawing 2b is its A-A vertical section sketch map, and its working face contacts with molten steel; Shown in the narrow copper plate working face be the double tapered structure on short transverse; Upper area is the inclined-plane, and lower area is for facing directly, and the inclined-plane of upper area has improved the tapering of crystallizer upper area; Play the effect that contacts tightness degree between the base shell that increases early solidification and the copper wall; Thereby strengthened the heat transfer of initial solidification process, improved the thickness and the intensity of initial solidification shell, helped the raising of cc billet surface quality.After adopting chamfering structure, the bight of strand is changed two obtuse angles into by original 90 ° of right angles, can improve strand corners temperature like this, and the tension that reduces strand bight in bending or the aligning process concentrates, and reaches the purpose of pilot angle transverse fissure.After narrow copper plate 1 chamfered region 2 adopted circular course and rectangle water channel to make up cooling, the lobe defective in strand bight can be able to control through the uniformity that improves circumferential temperature.
Accompanying drawing 3～6 has provided the maximum chamfering amount (being the thickness difference H between copper coin cross-section center line place and the corners) of cooling structure, working face shape and the both sides of narrow copper plate 1 inside.The principle that this narrow copper plate 1 inner cooling water channel is arranged is to guarantee the uniformity of conducting heat between base shell and the copper wall; Guarantee that simultaneously the strand corners has enough coolings; Copper coin chamfered region 2 is made up with rectangle cooling water channel 5 by circular cooling water channel 6 and cools off; 3 distance B should be controlled at 10～20mm apart from the side near rectangle cooling water channel 5 ports of side 3 for narrow copper plate 1, and purpose is for the copper coin periphery increases sealing ring essential space to be provided.
Accompanying drawing 3 has provided the cross-sectional structure of the utility model first embodiment or second embodiment; Its inside has the equally distributed combined type cooling water channel that connects on the short transverse, and the curve 4 of chamfered region on cross-sectional direction can be formed by the one or more combination in broken line, circular arc line, hyperbola and the parabola.Its cooling structure is characterised in that: plane domain is one or more equally distributed rectangle cooling water channels 5, adopts one or more rectangle cooling water channels 5 to add one or more circular cooling water channels 6 earlier near the copper coin side and makes up cooling.Because the copper coin bight has at first adopted darker rectangle cooling water channel 5 to cool off; In order to guarantee the effective thickness between water channel and the copper plate working surface; For the copper coin periphery increases sealing ring essential space is provided simultaneously; Be designed to point to the oblique water channel of copper coin corners near first cooling water channel of copper coin side, thereby guarantee that rectangle cooling water channel that narrow copper plate leans on most near part is controlled at 10～20mm in the outlet of bottom surface apart from the distance B of side.
Accompanying drawing 4 has provided the cross-sectional structure of the utility model the 3rd embodiment; Its inside has the equally distributed combined type cooling water channel that connects on the short transverse, and the curve 4 of chamfered region on cross-sectional direction can be formed by the one or more combination in broken line, circular arc line, hyperbola and the parabola.Its cooling structure is characterised in that: near the copper coin side is one or more circular cooling water channels 6 and one or more rectangle cooling water channels 5, and plane domain is one or more equally distributed rectangle cooling water channels 5.
Accompanying drawing 5 has provided the cross-sectional structure of the utility model the 4th embodiment; Its inside has the equally distributed combined type cooling water channel that connects on the short transverse, and the curve 4 of chamfered region on cross-sectional direction can be formed by the one or more combination in broken line, circular arc line and the parabola.Its cooling structure is characterised in that: plane domain is one or more equally distributed rectangle cooling water channels 5, and mould at narrow copper coin bight adopts one or more circular cooling water channels 6 and one or more rectangle cooling water channels 5 to carry out the combined crosswise cooling near the chamfered region 2 of working face.
Accompanying drawing 6 has provided the cross-sectional structure of the utility model the 5th embodiment; Its inside has the equally distributed combined type cooling water channel that connects on the short transverse, and the curve 4 of chamfered region on cross-sectional direction can be formed by the one or more combination in broken line, circular arc line, hyperbola and the parabola.Its cooling structure is characterised in that: plane domain is one or more equally distributed rectangle cooling water channels 5; Chamfered region 2 adopts one or more circular cooling water channels 6 to cool off, and adopts one or more rectangle cooling water channels 5 to replenish cooling in the bottom of circular cooling water channel 6.
Claims (9)
1. chamfering crystallizer narrow copper plate (1) with combined type cooling water channel; Its working face comprises plane domain and chamfered region (2); Plane domain is positioned at the middle part; Chamfered region (2) is positioned at the corners of both sides; Thickness difference H between copper coin cross-section center line place and the corners is 1.4～140mm, and chamfered region (2) is connected so that tangent mode is smooth on cross-sectional direction with plane domain, it is characterized in that: the straight length L of chamfered region (2) on cross section is 5～150mm; Narrow copper plate inside is distributed with along the circle of short transverse up/down perforation and rectangle cooling water channel, wherein the inside of chamfered region (2) rectangle cooling water channel (5) and 1～6 circular cooling water channel (6) that diameter is 5～10mm that to be distributed with 1～6 width be 4～8mm.
2. narrow copper plate as claimed in claim 1 (1); It is characterized in that: the width of said copper coin is 50～480mm; Highly be 700～1200mm, the plane domain copper plate thickness is 40～100mm, and its width is consistent on short transverse; Or plane domain width linear decrease from top to bottom, the stand out between copper coin upper limb and the lower edge is 0～4.0mm.
3. narrow copper plate as claimed in claim 1 (1) is characterized in that: said copper coin is a line of symmetry with the centre of surface line on width, is symmetrical distribution; On short transverse, its working face is a kind of in single tapering, double tapered or the many taperings.
4. narrow copper plate as claimed in claim 1 (1) is characterized in that: the curve (4) of said chamfered region (2) on cross-sectional direction is that the one or more combination in broken line, circular arc line, hyperbola and the parabola forms.
5. narrow copper plate as claimed in claim 1 (1) is characterized in that: the curve (4) of said chamfered region (2) on cross-sectional direction is 20～45 ° with the angle that side forms.
6. narrow copper plate as claimed in claim 1 (1) is characterized in that: at the chamfered region (2) of copper coin, the arrangement mode of rectangle cooling water channel (5) and circular course (6) is following any one:
(1) by forming near one or more rectangle cooling water channels (5) of copper coin side and adjacent one or more circular cooling water channel (6);
(2) by forming near the one or more circular cooling water channel (6) of copper coin side and adjacent one or more rectangle cooling water channels (5);
(3) form by a plurality of alternatively distributed circular cooling water channels (6) and rectangle cooling water channel (5);
(4) form by one or more rectangle cooling water channels (5) of one or more circular cooling water channels (6) and its underpart.
7. narrow copper plate as claimed in claim 6 (1) is characterized in that: at the chamfered region (2) of said copper coin both sides, the distance of cooling water channel and working face is 12～20mm on the cross section; And/or said copper coin side (3) is 10～20mm apart from the distance B of nearest rectangle cooling water channel (5) port.
8. narrow copper plate as claimed in claim 1 (1) is characterized in that: the inner water channel of the plane domain of said narrow copper plate (1) is that the circular cooling water channel (6) of 5～10mm is formed by equally distributed rectangle cooling water channel (5) and/or diameter.
9. like the described narrow copper plate of arbitrary claim 1-8 (1), it is characterized in that: said copper coin has one of following characteristic at least:
I) nickel coating, ferronickel coating or nickel cobalt coating are arranged on the working face of said copper coin;
II) do not have overlay coating on the working face of said copper coin, the material of whole copper coin is a kind of in silver-bearing copper, chromium zirconium copper, phosphor-copper, the beryllium copper.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120136707U CN202146982U (en) | 2011-05-03 | 2011-05-03 | Chamber crystallizer narrow-surface copper plate with a combined cooling water channel |
| DE201220004204 DE202012004204U1 (en) | 2011-05-03 | 2012-04-26 | Bevelled narrow-side copper plate for casting mold with funnel-shaped curved surface |
| JP2012002550U JP3176975U (en) | 2011-05-03 | 2012-04-27 | Chamfered short side copper plate for mold with funnel-shaped curved surface |
| US13/462,628 US8776862B2 (en) | 2011-05-03 | 2012-05-02 | Chamfered narrow side copper plate for mould with funnel-shaped curved surface |
| IT000173U ITMI20120173U1 (en) | 2011-05-03 | 2012-05-02 | CIANFRINATO SHORT-SIDED COPPER PLATE FOR A MOLD WITH FUNNEL SURFACE |
| US14/294,799 US9089894B2 (en) | 2011-05-03 | 2014-06-03 | Chamfered narrow side copper plate for mould with funnel-shaped curved surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120136707U CN202146982U (en) | 2011-05-03 | 2011-05-03 | Chamber crystallizer narrow-surface copper plate with a combined cooling water channel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202146982U true CN202146982U (en) | 2012-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120136707U Expired - Lifetime CN202146982U (en) | 2011-05-03 | 2011-05-03 | Chamber crystallizer narrow-surface copper plate with a combined cooling water channel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202146982U (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104096811A (en) * | 2014-08-04 | 2014-10-15 | 秦皇岛首秦金属材料有限公司 | Narrow-face copper plate for asymmetric slab continuous casting chamfering crystallizer |
| CN104209484A (en) * | 2014-09-15 | 2014-12-17 | 首钢总公司 | Narrow-face copper plate for chamfer crystallizer |
| CN104399917A (en) * | 2014-11-28 | 2015-03-11 | 东北大学 | Gradual cambered chamfered mold with enhanced water cooling structure and design method |
| CN105195692A (en) * | 2015-10-23 | 2015-12-30 | 河南行知专利服务有限公司 | Chamfered crystallizer narrow-surface copper plate |
| CN105665663A (en) * | 2016-04-15 | 2016-06-15 | 江苏沙钢集团有限公司 | Crystallizer |
| CN105983665A (en) * | 2015-02-28 | 2016-10-05 | 宝山钢铁股份有限公司 | Narrow-edge copper plate for slab mold with continuous variable taper at corner |
| CN105983666A (en) * | 2015-02-28 | 2016-10-05 | 宝山钢铁股份有限公司 | Slab crystallizer narrow-side cooper plate with curved surface profile consistent in shrinking |
| CN108356240A (en) * | 2018-04-13 | 2018-08-03 | 东北大学 | A kind of corner efficient heat transfer sheet billet leptoprosopy curved surface crystallizer and its design method |
| CN108356242A (en) * | 2018-04-13 | 2018-08-03 | 东北大学 | A kind of micro alloyed steel sheet billet Corner Crackss control equipment and technique |
| CN108526421A (en) * | 2018-04-13 | 2018-09-14 | 东北大学 | A kind of sheet billet leptoprosopy Gauss concave curved surface crystallizer and its design method |
| CN110405163A (en) * | 2019-09-03 | 2019-11-05 | 山东钢铁股份有限公司 | A kind of device and method for eliminating big width steel plate stocking edge black line defect |
| CN112958625A (en) * | 2021-01-28 | 2021-06-15 | 广西南南铝加工有限公司 | Preparation method of aluminum alloy ultra-wide plate |
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2011
- 2011-05-03 CN CN201120136707U patent/CN202146982U/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104096811A (en) * | 2014-08-04 | 2014-10-15 | 秦皇岛首秦金属材料有限公司 | Narrow-face copper plate for asymmetric slab continuous casting chamfering crystallizer |
| CN104096811B (en) * | 2014-08-04 | 2016-03-30 | 秦皇岛首秦金属材料有限公司 | A kind of asymmetric sheet billet continuous casting chamfer crystallizer narrow copper plate |
| CN104209484A (en) * | 2014-09-15 | 2014-12-17 | 首钢总公司 | Narrow-face copper plate for chamfer crystallizer |
| CN104399917A (en) * | 2014-11-28 | 2015-03-11 | 东北大学 | Gradual cambered chamfered mold with enhanced water cooling structure and design method |
| CN105983665A (en) * | 2015-02-28 | 2016-10-05 | 宝山钢铁股份有限公司 | Narrow-edge copper plate for slab mold with continuous variable taper at corner |
| CN105983666A (en) * | 2015-02-28 | 2016-10-05 | 宝山钢铁股份有限公司 | Slab crystallizer narrow-side cooper plate with curved surface profile consistent in shrinking |
| CN105195692A (en) * | 2015-10-23 | 2015-12-30 | 河南行知专利服务有限公司 | Chamfered crystallizer narrow-surface copper plate |
| CN105665663A (en) * | 2016-04-15 | 2016-06-15 | 江苏沙钢集团有限公司 | Crystallizer |
| CN108356240A (en) * | 2018-04-13 | 2018-08-03 | 东北大学 | A kind of corner efficient heat transfer sheet billet leptoprosopy curved surface crystallizer and its design method |
| CN108356242A (en) * | 2018-04-13 | 2018-08-03 | 东北大学 | A kind of micro alloyed steel sheet billet Corner Crackss control equipment and technique |
| CN108526421A (en) * | 2018-04-13 | 2018-09-14 | 东北大学 | A kind of sheet billet leptoprosopy Gauss concave curved surface crystallizer and its design method |
| CN110405163A (en) * | 2019-09-03 | 2019-11-05 | 山东钢铁股份有限公司 | A kind of device and method for eliminating big width steel plate stocking edge black line defect |
| CN112958625A (en) * | 2021-01-28 | 2021-06-15 | 广西南南铝加工有限公司 | Preparation method of aluminum alloy ultra-wide plate |
| CN112958625B (en) * | 2021-01-28 | 2023-02-21 | 广西南南铝加工有限公司 | Preparation method of aluminum alloy ultra-wide plate |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120222 |