EP4078167A1 - Verfahren zur zerstörungsfreien rissprüfung von oberflächen von laufschaufeln aufnehmenden schaufelaufnahmenuten eines rotors sowie ultraschalleinrichtung - Google Patents
Verfahren zur zerstörungsfreien rissprüfung von oberflächen von laufschaufeln aufnehmenden schaufelaufnahmenuten eines rotors sowie ultraschalleinrichtungInfo
- Publication number
- EP4078167A1 EP4078167A1 EP21701934.8A EP21701934A EP4078167A1 EP 4078167 A1 EP4078167 A1 EP 4078167A1 EP 21701934 A EP21701934 A EP 21701934A EP 4078167 A1 EP4078167 A1 EP 4078167A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- guide rail
- ultrasonic
- blade
- test head
- 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.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000002604 ultrasonography Methods 0.000 title claims abstract description 10
- 239000000523 sample Substances 0.000 claims description 27
- 238000003745 diagnosis Methods 0.000 claims description 8
- 230000001066 destructive effect Effects 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/043—Analysing solids in the interior, e.g. by shear waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/225—Supports, positioning or alignment in moving situation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/262—Arrangements for orientation or scanning by relative movement of the head and the sensor by electronic orientation or focusing, e.g. with phased arrays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/106—Number of transducers one or more transducer arrays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/269—Various geometry objects
- G01N2291/2693—Rotor or turbine parts
Definitions
- the invention relates to a method for surface crack testing of surfaces of rotor blades receiving blade receiving grooves of a rotor, wherein the blade receiving grooves are distributed at regular intervals along the circumference of the rotor and the blades received in these are spaced from one another in such a way that between adjacent blades an externally accessible crescent or strip-shaped rotor surface portion extends.
- the invention also relates to an ultrasonic device designed to carry out a method according to the invention.
- the blade receiving grooves of turbine rotors are regularly subjected to a surface crack test.
- the surface crack test is carried out non-destructively with dismantled rotor blades, for example by means of a paint penetration test, eddy current measurement technology, ultrasound or the like.
- a paint penetration test for example, a paint penetration test, eddy current measurement technology, ultrasound or the like.
- the applicant is currently using a surface crack testing method in which cracks and their position are recorded in terms of data using an eddy current detection tool that is moved like a dog through the blade receiving grooves. Machining tools are then used to remove detected cracks.
- a disadvantage of the known surface crack test methods is that the removal of the rotor blades, the subsequent crack test, the removal of cracks that may be required and the reinstallation of the rotor blades are very time-consuming and time-consuming, which is also associated with high costs . This is also the case if the surface crack test does not detect any relevant cracks.
- the present invention creates a method for the non-destructive crack testing of surfaces of rotor blades receiving blade receiving grooves of a rotor, wherein the blade receiving grooves are distributed at regular intervals along the circumference of the rotor and the blades received in these are spaced from one another in such a way that that a crescent-shaped or strip-shaped rotor surface section accessible from the outside extends between adjacent rotor blades, comprising the steps of: a) positioning a guide rail on a rotor surface section extending between two rotor blades in such a way that the guide rail can be checked along at least one Fenden Schaufelingut extends, and attaching the guide rail; b) positioning an ultrasonic test head in such a way that it is aligned in the direction of at least one blade receiving groove to be tested and can be moved along a trajectory given by the shape of the guide rail; c) Moving the ultrasonic probe along the trajectory in the installed state of the two adjacent moving blades and simultaneous testing of
- a major advantage associated with the method according to the invention is that the rotor blades do not have to be removed in order to carry out the method. Accordingly, the method is associated with little effort and low costs.
- the shape of the guide rail that dictates the trajectory is determined in advance using an ultrasonic simulation and the guide rail is manufactured additively based on the determined shape.
- the optimal trajectory for the ultrasonic test head and thus the optimal shape of the guide rail can be determined, along which the ultrasonic test head must be moved in order to be able to test all relevant surfaces of a blade receiving groove experience has shown that cracking is most likely to occur.
- the additive manufacturing of the guide rail based on the shape of the guide rail it averaged then enables a simple, inexpensive and fast manufacture of the guide rail.
- the guide rail can be attached magnetically and / or non-positively and / or positively to the rotor and / or to the rotor blades.
- a magnetic and at least partially form-fitting fastening is given before, since no mechanical processing has to be carried out on the rotor or on its rotor blades.
- the ultrasonic probe is advantageously a phased array ultrasonic probe. This is advantageous in that entire surface areas can be scanned without moving the sensor.
- the angle of incidence into the workpiece can be adjusted as required within specified limits, so that the relevant surfaces of a blade holder can be checked within the scope of a single movement of the ultrasonic probe along the trajectory.
- step c) data on the shapes and dimensions of existing cracks are preferably recorded using the ultrasonic probe. This is particularly advantageous for the subsequent diagnosis, since the influence of existing cracks on the expected service life of the rotor can be estimated very well based on the crack geometry. Correspondingly, a statement can be made as to whether an immediate repair of the detected cracks is necessary or not.
- step c) data about the respective position of the existing cracks are recorded and stored, in particular based on the actual positions of the ultrasonic probe at the time of crack detection.
- the location of a crack can influence its relevance with regard to the expected service life of the rotor.
- knowledge of the location of a crack is important for any subsequent repair work.
- the ultrasonic test head is advantageously moved manually along the trajectory in step c), whereby the structure of the ultrasonic test device is significantly simplified, since no drive means have to be provided.
- the surfaces of all the blade receiving grooves are not checked, but only a random check of the surfaces of some blade receiving grooves takes place.
- the diagnosis of the entire rotor in Step f) then takes place on the basis of empirical values. Alternatively, of course, a full inspection of all blade receiving grooves can also be carried out.
- a decision is preferably made as to whether mechanical processing of the recorded cracks is necessary at the current point in time.
- the blade receiving grooves are fir tree-shaped blade receiving grooves.
- the rotor is preferably the rotor of a steam turbine.
- the present invention creates an ultrasonic device which is designed to carry out the method according to the invention, comprising a guide rail and an ultrasonic test head which can be moved along the guide rail.
- the ultrasonic device preferably has a housing defining the guide rail and an ultrasonic test head holder which can be moved along the guide rail and to which the ultrasonic test head is fastened, in particular is fastened releasably.
- the shape of the housing is advantageously adapted to the shape of the rotor surface sections and / or to the shape of at least one rotor blade in such a way that the housing can be positioned flat on a rotor surface section and / or in a form-fitting manner on a rotor blade. Thanks to such a configuration, the housing and thus the guide rail can be positioned exactly with high reproducibility on a rotor surface section.
- a push rod is attached to the ultrasonic probe holder, which is provided with a handle piece at its free end.
- the ultrasound probe holder together with the ultrasound probe held on it can easily be moved along the trajectory given by the guide rail, the handle ensuring convenient handling.
- An encoder is advantageously held on the housing, which is set up and positioned in such a way that it detects the actual position of the ultrasonic probe holder and thus the actual position of the ultrasonic probe. Thanks to such an encoder, the positions of existing cracks can be recorded by assigning crack data to the respective actual positions of the ultrasonic probe at the time of recording.
- FIG. 1 is a perspective schematic partial view of an exemplary rotor
- FIG. 2 is a flow chart showing the steps of a method according to an embodiment of the present invention.
- FIG. 3 shows a view analogous to FIG. 1, an ultrasonic device being positioned on the rotor and two of the three rotor blades not being shown for reasons of clarity
- FIG. 4 is a perspective view of a single rotor blade held on the rotor.
- FIG. 1 shows a partial area of a rotor 1, which is in particular the rotor of a steam turbine.
- the rotor 1 comprises a plurality of blade receiving grooves 2, which have identical dimensions and, in the present case, are designed in the shape of a tan tree.
- the blade receiving grooves 2 are distributed at regular intervals along the circumference of the rotor 1.
- the blade root 3 of a blade 4 is inserted, the shape of which is designed to correspond to the shape of the blade receiving groove 2 for this purpose.
- the blades 5 of the blades 4 adjoining the blade feet 3 project radially outward in a known manner.
- a rotor surface section 6, which is accessible from the outside and in the present case is sickle-shaped, extends between adjacent rotor blades 4.
- the rotor 1 is subject to high mechanical, chemical and thermal loads. Because of these loads, cracks are regularly observed on the surfaces 7 of the blade run 2, which can greatly reduce the service life of the rotor 1.
- the blade receiving grooves 2 are regularly subjected to a surface crack test as part of maintenance work.
- FIG. 2 schematically shows the steps of a method according to an embodiment of the present invention for the non-destructive crack testing of such surfaces 7 of the blade receiving grooves 2 of a rotor 1.
- an ultrasonic device 8 is attached to one of the between two rotor blades 4 extending rotor surfaces section 6 positioned and fastened.
- the ultrasonic device 8 shown in Figure 3 comprises a housing 9, the shape and dimensions of which are adapted to the shape and dimensions of the rotor surface sections 6 of the rotor 1 in such a way that the housing 9 is inserted between two adjacent rotor blades 4 in the area of a rotor surface section 6 leaves.
- the underside of the housing 9 is designed in such a way that the housing 9 rests flat on the rotor surface section 6 in the assembled state.
- a first side surface 11 of the housing 9 is adapted to the contour of the blade 5 of an adjacent rotor blade 4 in such a way that this side surface 11 rests positively on the blade 5 and forms an axial stop for the ultrasonic device 8.
- a guide rail ne 13 is formed in which an ultrasonic probe holder 14 is received in the direction of arrows 15 movable back and forth.
- An ultrasonic test head 16 is preferably detachably positioned on the ultrasonic test head holder 14 in such a way that, in the state shown in FIG. 3, it is oriented in the direction of at least one blade receiving groove 2 to be tested.
- the ultrasonic test head 16 is embodied in the present case as a phased array ultrasonic test head, it also being possible in principle to use other ultrasonic test heads.
- a push rod 17 is articulated to the ultrasonic probe holder 14 and is provided with a handle 18 at its free end.
- Another handle 19 is fixedly positioned on the housing 9 and protrudes axially outward from this substantially.
- an encoder 20 is held on the housing 9, which encoder is set up and positioned in such a way that it detects the actual position of the ultrasonic test head holder 14 and therefore the actual position of the ultrasonic test head 16.
- the encoder 20 can be designed, for example, as a cable encoder. Alternatively, of course, other Enco der types are also possible.
- Positioned manufactured magnets for example, several neodymium magnets.
- the housing 9, even if this is not the case in the present case, can be non-positively attached to the rotor 1, for example using clamping jaws which engage axially opposite sides of the rotor 1.
- the positioning and fastening of the ultrasonic device 8 on the rotor 1 is carried out with the rotor blades 4 mounted.
- the rotor 1 itself does not have to be removed from the turbine for this purpose.
- the method is preferably carried out on the removed rotor 1.
- the ultrasonic device 8 is simply placed in the area between two rotor blades 4 on the rotor surface section 6 located therebetween in such a way that the first side surface 11 of the housing 9 rests against the adjacent blade 5. During the positioning, the ultrasonic device 8 can be held on the handle 19 ge, which facilitates the handling of the ultrasonic device 8.
- the attachment of the ultrasonic device 8 takes place automatically via the magnets provided on the underside 10 of the hous ses 9. With the proper positioning of the housing 9, the ultrasonic probe 16 held on the ultrasonic probe holder 14 is automatically aligned with the blade root receiving groove 2 to be tested or with the blade root receiving groove 2 to be tested.
- the ultrasonic test head holder 14 and thus the ultrasonic test head 16 are now moved manually along the trajectory given by the guide rail 13 when the two adjacent blades 4 are installed. The movement takes place under a set of push rod 17, the handle 18 of which the operator holds with one hand. With the other hand, the operator can grip the other handle 19 in order to stabilize the ultrasound device 8.
- Steps S1 to S3 are then repeated to check surfaces 7 of further blade receiving grooves 2 for the presence of cracks.
- the surfaces 7 of all the Schaufelier take grooves 2 are checked. Rather, only surfaces 7 of some blade receiving grooves 2 are randomly checked.
- the number of surfaces checked must be selected in such a way that there is sufficient representative data to make a statement about the rotor state on the basis of the stored data and on the basis of empirical values in a subsequent diagnosis step S4.
- a decision is made as to whether the cracks need to be repaired at the current time.
- a full inspection of all blade receiving grooves 2 can also be carried out.
- the method according to the invention is particularly characterized in that it is carried out with blades 4 mounted on the rotor 1. Accordingly, the running show fine 4 is not dismantled and then reassembled.
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020201671.2A DE102020201671A1 (de) | 2020-02-11 | 2020-02-11 | Verfahren zur zerstörungsfreien Rissprüfung von Oberflächen von Laufschaufeln aufnehmenden Schaufelaufnahmenuten eines Rotors sowie Ultraschalleinrichtung |
PCT/EP2021/050781 WO2021160369A1 (de) | 2020-02-11 | 2021-01-15 | Verfahren zur zerstörungsfreien rissprüfung von oberflächen von laufschaufeln aufnehmenden schaufelaufnahmenuten eines rotors sowie ultraschalleinrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4078167A1 true EP4078167A1 (de) | 2022-10-26 |
Family
ID=74285448
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21701934.8A Pending EP4078167A1 (de) | 2020-02-11 | 2021-01-15 | Verfahren zur zerstörungsfreien rissprüfung von oberflächen von laufschaufeln aufnehmenden schaufelaufnahmenuten eines rotors sowie ultraschalleinrichtung |
Country Status (4)
Country | Link |
---|---|
US (1) | US20230333060A1 (de) |
EP (1) | EP4078167A1 (de) |
DE (1) | DE102020201671A1 (de) |
WO (1) | WO2021160369A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020201671A1 (de) * | 2020-02-11 | 2021-08-12 | Siemens Aktiengesellschaft | Verfahren zur zerstörungsfreien Rissprüfung von Oberflächen von Laufschaufeln aufnehmenden Schaufelaufnahmenuten eines Rotors sowie Ultraschalleinrichtung |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4502331A (en) | 1983-09-14 | 1985-03-05 | Southwest Research Institute | Method for ultrasonic inspection of turbine disc rims |
US6082198A (en) * | 1998-12-30 | 2000-07-04 | Electric Power Research Institute Inc. | Method of ultrasonically inspecting turbine blade attachments |
KR100358085B1 (ko) * | 1999-10-26 | 2002-10-25 | 한국수력원자력 주식회사 | 발전용 터빈 쉬라우드 밴드부 트랙킹 장치를 이용한 핀-핑거형 블레이드 루트부 자동 초음파 검사방법 |
US6725722B1 (en) * | 2003-02-11 | 2004-04-27 | General Electric Company | Method of inspecting turbine wheel and bucket finger dovetails for cracks |
EP2096433A1 (de) * | 2008-02-26 | 2009-09-02 | Siemens Aktiengesellschaft | Vorrichtung zur zerstörungsfreien Materialprüfung eines Prüfgegenstands mit Ultraschallwellen |
US8235663B2 (en) * | 2008-12-11 | 2012-08-07 | General Electric Company | Article and ultrasonic inspection method and system therefor |
EP2418483A1 (de) | 2010-08-10 | 2012-02-15 | RWE Npower plc. | Ultraschallprüfvorrichtung und Verfahren zur Prüfung von Komponenten und eines Keils sowie Verfahren zur Herstellung eines Keils |
EP2447714A1 (de) * | 2010-10-28 | 2012-05-02 | Siemens Aktiengesellschaft | Automatische prüfkopfpositionsabhängige Einschallwinkelverstellung für Ultraschallprüfköpfe |
US9739167B2 (en) * | 2012-07-25 | 2017-08-22 | Siemens Energy, Inc. | Method and system for monitoring rotating blade health |
US9835596B2 (en) * | 2013-01-17 | 2017-12-05 | Siemens Energy, Inc. | System and method for identification, grouping and sizing of embedded flaws in rotor components using ultrasonic inspection |
US9482645B2 (en) * | 2013-05-17 | 2016-11-01 | General Electric Company | Ultrasonic detection method and ultrasonic analysis method |
KR101536607B1 (ko) * | 2013-11-11 | 2015-07-15 | 한전케이피에스 주식회사 | 가스터빈 로터 디스크의 비파괴 검사장치 |
JP6300225B2 (ja) * | 2013-12-03 | 2018-03-28 | 東芝エネルギーシステムズ株式会社 | タービン翼の検査装置及びその検査方法 |
JP6395498B2 (ja) * | 2014-08-12 | 2018-09-26 | 三菱重工コンプレッサ株式会社 | タービンロータディスクの翼溝部の超音波探傷方法及び装置 |
EP3139004B1 (de) * | 2015-09-02 | 2020-07-29 | General Electric Technology GmbH | Turbinenschaufel mit ultraschallwellen-streuungsmerkmal |
KR101847922B1 (ko) * | 2015-11-30 | 2018-04-12 | 고려공업검사 주식회사 | 터빈 로터 핑거 도브테일의 초음파 검사장치 |
DE102016219171A1 (de) * | 2016-10-04 | 2018-04-05 | Siemens Aktiengesellschaft | Verfahren zur zerstörungsfreien Materialprüfung |
JP2019184409A (ja) * | 2018-04-09 | 2019-10-24 | 三菱日立パワーシステムズ株式会社 | 超音波探傷システム、プログラムおよび超音波探傷方法 |
DE102018208293A1 (de) * | 2018-05-25 | 2019-11-28 | Siemens Aktiengesellschaft | Prüfvorrichtung |
DE102020201671A1 (de) * | 2020-02-11 | 2021-08-12 | Siemens Aktiengesellschaft | Verfahren zur zerstörungsfreien Rissprüfung von Oberflächen von Laufschaufeln aufnehmenden Schaufelaufnahmenuten eines Rotors sowie Ultraschalleinrichtung |
JP7480020B2 (ja) * | 2020-10-27 | 2024-05-09 | 株式会社東芝 | 超音波探傷用プローブ配置の設計方法及びタービン翼の検査方法並びにプローブホルダ |
-
2020
- 2020-02-11 DE DE102020201671.2A patent/DE102020201671A1/de not_active Withdrawn
-
2021
- 2021-01-15 WO PCT/EP2021/050781 patent/WO2021160369A1/de unknown
- 2021-01-15 EP EP21701934.8A patent/EP4078167A1/de active Pending
- 2021-01-15 US US17/796,663 patent/US20230333060A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2021160369A1 (de) | 2021-08-19 |
US20230333060A1 (en) | 2023-10-19 |
DE102020201671A1 (de) | 2021-08-12 |
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