DK2697047T3 - Vindmøllevinge med cylindrisk metalindlæg i rodområdet - Google Patents
Vindmøllevinge med cylindrisk metalindlæg i rodområdet Download PDFInfo
- Publication number
- DK2697047T3 DK2697047T3 DK12714309.7T DK12714309T DK2697047T3 DK 2697047 T3 DK2697047 T3 DK 2697047T3 DK 12714309 T DK12714309 T DK 12714309T DK 2697047 T3 DK2697047 T3 DK 2697047T3
- Authority
- DK
- Denmark
- Prior art keywords
- insert
- wind turbine
- turbine blade
- root region
- fibres
- Prior art date
Links
- 239000002184 metal Substances 0.000 title claims description 52
- 229910052751 metal Inorganic materials 0.000 title claims description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 229920000642 polymer Polymers 0.000 claims description 19
- 239000011159 matrix material Substances 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 9
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 7
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 7
- 239000003733 fiber-reinforced composite Substances 0.000 claims 3
- 238000010030 laminating Methods 0.000 claims 1
- 239000011208 reinforced composite material Substances 0.000 description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 239000003365 glass fiber Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 238000005219 brazing Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229920001567 vinyl ester resin Polymers 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
- B29L2031/082—Blades, e.g. for helicopters
- B29L2031/085—Wind turbine blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2250/00—Geometry
- F05B2250/20—Geometry three-dimensional
- F05B2250/23—Geometry three-dimensional prismatic
- F05B2250/231—Geometry three-dimensional prismatic cylindrical
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2250/00—Geometry
- F05B2250/20—Geometry three-dimensional
- F05B2250/29—Geometry three-dimensional machined; miscellaneous
- F05B2250/292—Geometry three-dimensional machined; miscellaneous tapered
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2250/00—Geometry
- F05B2250/60—Structure; Surface texture
- F05B2250/61—Structure; Surface texture corrugated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/10—Inorganic materials, e.g. metals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/10—Inorganic materials, e.g. metals
- F05B2280/101—Iron
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/10—Inorganic materials, e.g. metals
- F05B2280/107—Alloys
- F05B2280/1071—Steel alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/60—Properties or characteristics given to material by treatment or manufacturing
- F05B2280/6013—Fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2280/00—Materials; Properties thereof
- F05B2280/70—Treatments or modification of materials
- F05B2280/702—Reinforcements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Wind Motors (AREA)
Claims (11)
1. En vindmøllevinge (2) til en vindmøllerotor omfattende et nav ud fra hvilket vindmøllevingen (2) strækker sig, når den er monteret til navet, hvor vindmøllevingen (2) omfatter et skallegeme af fiberforstærket kompositmateriale, som omfatter fibre indlejret i en polymermatrix, idet vindmøllevingen (2) strækker sig i en langsgående retning og har en profileret kontur, der omfatter en trykside og en sugeside såvel som en forkant og en bagkant med en korde mellem forkanten og bagkanten, hvor den profilerede kontur set i længderetningen omfatter et rodområde (26) med en rodendeflade (29), et bæreplansområde (27) og valgfrit et overgangsområde (28) mellem rodområdet (26) og bæreplansområdet (27), hvor rodområdet (26) har et ringformet tværsnit med en ydre overflade og en indre overflade, hvor rodområdet (26) omfatter flere fastgørelsesmidler, der er placeret til i hovedsagen at følge rodområdets (26) omkreds og muliggør tilgang udefra til, at fastgørelsesmidlerne kan anvendes til at montere vingen til navet, kendetegnet ved, at et i det mindste delvist cylindrisk metalindlæg (7), der omfatter flere af fastgørelsesmidlerne, er indlejret i rodområdet ved, at indlægget (7) er lamineret ind i rodområdets (26) kompositmateriale mellem et ydre lag (5) og et indre lag (6) af fiberforstærket polymer i skallegemet, så det i hovedsagen føler rodområdets (26) omkreds, hvor det delvist cylindriske metalindlæg (7) har en første ende (9) og en anden ende samt en radial ydre overflade (11a) og en radial indre overflade (11b), og hvor de flere indbyrdes i afstand placerede fastgørelsesmidler kan tilgås ved indlæggets (7) første ende (9), og hvor indlæggets (7) første ende (9) er placeret ved vindmøllevingens rodendeflade (29), og hvor indlægget (7) er en halvcylinder, dvs. strækker sig 180 grader langs omkredsen, eller er en fuld cylinder, dvs. strækker sig 360 grader langs omkredsen.
2. En vindmøllevinge ifølge ethvert af de foregående krav, hvor indlægget (7) tilspidses set fra den indre retning fra den første ende (9) mod den anden ende (10).
3. En vindmøllevinge ifølge krav 2, hvor indlægget (7) tilspidses i det mindste over en del af dets længde.
4. En vindmøllevinge ifølge krav 2 og/eller krav 3, hvor indlægget (7) tilspidses kontinuerligt.
5. En vindmøllevinge ifølge ethvert af de foregående krav, hvor indlæggets (7) ydre overflade (11a) og/eller indre overflade (11b) er korrugeret.
6. En vindmøllevinge ifølge ethvert af de foregående krav, hvor indlægget er lavet af jern eller stål.
7. En vindmøllevinge ifølge ethvert af de foregående krav, hvor indlægget (7) omfatter metalfibre eller -wires fastgjort dertil og strækkende sig udad derfra og værende indlejret i polymermatricen af det fiberforstærkede kompositmateriale.
8. En vindmøllevinge ifølge krav 7, hvor metalfibrene eller -wirene er fast forbundne med indlæggets (7) ydre overflade (11a) og/eller indre overflade (11b).
9. En vindmøllevinge ifølge krav 7 eller 8, hvor metalfibrene eller -wirene er fast forbundne med indlæggets (7) anden ende.
10. En vindmøllevinge ifølge ethvert af kravene 7-9, hvor metalfibrene eller-wirene er lavet afjern eller stål.
11. En vindmøllevinge ifølge ethvert af de foregående krav, hvor rodområdets (26) fiberforstærkede kompositmateriale omfatter metalfibre, fortrinsvis stål- eller jernfibre.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11161894 | 2011-04-11 | ||
EP11161896 | 2011-04-11 | ||
PCT/EP2012/056533 WO2012140049A2 (en) | 2011-04-11 | 2012-04-11 | Wind turbine blade comprising cylindrical metal inserts in a root region thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
DK2697047T3 true DK2697047T3 (da) | 2016-11-21 |
Family
ID=45954667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK12714309.7T DK2697047T3 (da) | 2011-04-11 | 2012-04-11 | Vindmøllevinge med cylindrisk metalindlæg i rodområdet |
Country Status (6)
Country | Link |
---|---|
US (1) | US9976537B2 (da) |
EP (1) | EP2697047B1 (da) |
CN (1) | CN103635306B (da) |
DK (1) | DK2697047T3 (da) |
ES (1) | ES2598828T3 (da) |
WO (1) | WO2012140049A2 (da) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140119926A1 (en) * | 2012-10-31 | 2014-05-01 | General Electric Company | Wind turbine rotor blade assembly with a ring insert in the blade root |
US10060411B2 (en) | 2015-07-22 | 2018-08-28 | General Electric Company | Rotor blade root assembly for a wind turbine |
US9970304B2 (en) | 2015-07-22 | 2018-05-15 | General Electric Company | Rotor blade root assembly for a wind turbine |
CN105370507B (zh) * | 2015-12-08 | 2017-12-19 | 中国科学院工程热物理研究所 | 一种风电叶片根部延长段构件及其制造方法 |
EP3402659A1 (en) * | 2016-01-11 | 2018-11-21 | LM WP Patent Holding A/S | Embedding element for a wind turbine blade |
CN106609726B (zh) * | 2016-12-20 | 2019-10-11 | 北京金风科创风电设备有限公司 | 叶片用嵌块、叶片及风力发电机组 |
GB2569295A (en) * | 2017-12-08 | 2019-06-19 | Vestas Wind Sys As | A replacement insert for repair of a joint connecting a wind turbine rotor blade to a rotor hub |
CN111684154B8 (zh) * | 2017-12-08 | 2023-07-21 | 维斯塔斯风力系统有限公司 | 用于风力涡轮机叶片根部的插入件和坯件 |
DE102018108906A1 (de) * | 2018-04-16 | 2019-10-17 | Wobben Properties Gmbh | Windenergieanlagen-Rotorblatt und Windenergieanlage |
CN112105814B (zh) * | 2018-05-04 | 2023-09-22 | 通用电气公司 | 形成风力涡轮机转子叶片根部的方法 |
DE102020201867A1 (de) * | 2020-02-14 | 2021-08-19 | Siemens Aktiengesellschaft | Faserverstärkte Laufschaufel für eine Strömungsmaschine sowie Verfahren zum Herstellen einer solchen Laufschaufel |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19625426A1 (de) | 1996-06-25 | 1998-01-08 | Ferriere Belloli & Co | Verbindungsvorrichtung, Verfahren zur Herstellung derselben, Vorrichtung zur Durchführung des Verfahrens und Verwendung der Verbindungsvorrichtung |
DK1467853T3 (da) * | 2002-01-11 | 2007-08-06 | Fiberline As | Fremgangsmåde til fremstilling af et fiberforstærket strukturelement |
DK176564B1 (da) * | 2004-12-29 | 2008-09-01 | Lm Glasfiber As | Fiberforstærket samling |
US8172538B2 (en) * | 2004-12-29 | 2012-05-08 | Vestas Wind Systems A/S | Method of manufacturing a wind turbine blade shell member with a fastening member and a wind turbine blade with a fastening member |
DE102008021498A1 (de) * | 2008-04-29 | 2009-11-05 | Repower Systems Ag | Verfahren zur Fertigung eines Blattanschlusses eines Rotorblatts, ein Blattanschluss und ein Befestigungselement für einen Blattanschluss |
ES2369442B1 (es) * | 2008-06-27 | 2012-10-09 | Gamesa Innovation & Technology, S.L. | Inserto de pala y método de colocación de insertos en el laminado de una pala. |
EP2138716B2 (en) * | 2008-06-27 | 2024-02-14 | Siemens Gamesa Renewable Energy Innovation & Technology, S.L. | Blade insert |
EP2153964A1 (en) * | 2008-08-14 | 2010-02-17 | Lm Glasfiber A/S | A method of manufacturing a wind turbine blade comprising steel wire reinforced matrix material |
GB2472460B (en) * | 2009-08-07 | 2011-11-16 | Gurit | Wind or tidal turbine blade having an attachment |
CN102021232A (zh) | 2009-09-22 | 2011-04-20 | 北京雅康博生物科技有限公司 | 用于定量检测egfr突变的试剂盒 |
AT510694B1 (de) * | 2011-01-21 | 2012-06-15 | Hexcel Holding Gmbh | Modul zum halten von mindestens einer hülse |
-
2012
- 2012-04-11 WO PCT/EP2012/056533 patent/WO2012140049A2/en active Application Filing
- 2012-04-11 DK DK12714309.7T patent/DK2697047T3/da active
- 2012-04-11 EP EP12714309.7A patent/EP2697047B1/en active Active
- 2012-04-11 CN CN201280028601.2A patent/CN103635306B/zh active Active
- 2012-04-11 US US14/111,055 patent/US9976537B2/en active Active
- 2012-04-11 ES ES12714309.7T patent/ES2598828T3/es active Active
Also Published As
Publication number | Publication date |
---|---|
CN103635306A (zh) | 2014-03-12 |
WO2012140049A3 (en) | 2013-01-10 |
CN103635306B (zh) | 2016-05-04 |
ES2598828T3 (es) | 2017-01-30 |
US9976537B2 (en) | 2018-05-22 |
US20140030097A1 (en) | 2014-01-30 |
WO2012140049A2 (en) | 2012-10-18 |
EP2697047B1 (en) | 2016-07-20 |
EP2697047A2 (en) | 2014-02-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DK2697047T3 (da) | Vindmøllevinge med cylindrisk metalindlæg i rodområdet | |
DK2697046T3 (da) | Vindmøllevinge med tilspidsede rodbøsninger | |
US10309369B2 (en) | Wind turbine blade having a root region with elongated fastening members provided with metal fibres | |
DK2917568T3 (da) | Vindmøllevinge med fastgørelseselementer | |
US9745956B2 (en) | Spar cap for a wind turbine rotor blade | |
US9551317B2 (en) | Wind turbine blade with elongated fastening members in the root region thereof | |
US20140030093A1 (en) | Wind turbine blade comprising resistive heating means | |
US11668277B2 (en) | Wind turbine jointed rotor blade having a hollow chord-wise extending pin | |
US11927171B2 (en) | Wind turbine blade assembly and method for producing a wind turbine blade |