Source: http://www.google.com/patents/US6617849?dq=7,444,563
Timestamp: 2015-04-21 19:06:34
Document Index: 654630762

Matched Legal Cases: ['art 14', 'art 13', 'art 16', 'art 16', 'art 14', 'art 18', 'art 16', 'art 13', 'art 18', 'art 13']

Patent US6617849 - Device for the nondestructive testing of especially hot bar shaped rolling ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA device for nondestructive testing of especially hot, bar-shaped rolling material above Curie point during the rolling process by means of an exploring coil system which can be impinged upon by a coolant and which rotates around the rolling material passing therethrough. The exploring coil system consists...http://www.google.com/patents/US6617849?utm_source=gb-gplus-sharePatent US6617849 - Device for the nondestructive testing of especially hot bar shaped rolling materialAdvanced Patent SearchPublication numberUS6617849 B1Publication typeGrantApplication numberUS 09/762,576PCT numberPCT/DE2000/001971Publication dateSep 9, 2003Filing dateJun 14, 2000Priority dateJun 15, 1999Fee statusPaidAlso published asDE50014111D1, EP1105721A1, EP1105721B1, WO2000077513A1, WO2000077513A9Publication number09762576, 762576, PCT/2000/1971, PCT/DE/0/001971, PCT/DE/0/01971, PCT/DE/2000/001971, PCT/DE/2000/01971, PCT/DE0/001971, PCT/DE0/01971, PCT/DE0001971, PCT/DE001971, PCT/DE2000/001971, PCT/DE2000/01971, PCT/DE2000001971, PCT/DE200001971, US 6617849 B1, US 6617849B1, US-B1-6617849, US6617849 B1, US6617849B1InventorsHorst ScharlemannOriginal AssigneeGeorgsmarienh�tte GmbhExport CitationBiBTeX, EndNote, RefManPatent Citations (11), Referenced by (1), Classifications (14), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetDevice for the nondestructive testing of especially hot bar shaped rolling material
Such an arrangement is particularly suitable in conjunction with so-called multi-roll rolling stands, where provision is made, for example for three rolls or rollers each being arranged offset by 120� in relation to each other (a so-called Kocks block), and where in such a block a first roll triple is followed at a distance of about 35 cm by another roll triple. The device as defined by the invention is designed in such a way that it fits between the roll triples in said relatively confined space. Owing to the fact that the two roll triples follow each other so closely, exactly straight guidance of the rolling stock is assured, so that no further adjustment work is required after the device as defined by the invention has been set up and first adjustments have been made.
A particularly preferred embodiment of the test coils in the device as defined by the invention is specified in claim 3. In said embodiment, the test coils each are arranged on an approximately L-shaped support, specifically on the end of the longer leg of the �L�, and the support can be pivoted around an axle extending in the zone of the point of intersection of the legs. The supports, therefore, form angle levers.
Such a spring engages, for example the shorter leg of the �L� which has a counterweight making said leg heavier than the longer leg of the �L�. The spring ensures that the longer leg of the �L� with the test coil arranged thereon remains swung out of the measuring position until an adequate rotational speed of the test coil system has been reached. Said rotational speed is attained only if the leading end of the rolling stock to be measured (which naturally contains many impurities and errors and is later cut off, and which, furthermore, does not have the absolute straightness required for the measurement) has passed the measuring site. The frequency of rotation of the test coil system is adequately high for overcoming the force of the spring only then, and the shorter leg is then driven outwards due to the centrifugal force, which drives the test coil into the measuring position.
An alternative to the above is proposed by claim 5. According to claim 5, a pressure medium cylinder is arranged between the coolant feed to at least one test coil, and the short leg of the �L� of a test coil support disposed opposite said test coil. The piston of said cylinder is acted upon the shorter leg of the �L� via a bypass line by means of a piston rod as soon as the pressure of the coolant has exceeded a defined pressure value, causing the test coil to be pressed from a position removed from the rolling stock and into the measuring position. In the present case, too, the leading end of the rolling stock to be measured can be excluded during the measuring process by raising the pressure of the coolant to the required value only after said leading end has passed through, so that the small pressure medium cylinder is capable of pressing the test coil into the measuring position.
Such a roll cooling system is referred to also as antlers because especially in conjunction with so-called Kocks blocks, where three rolls each are offset in relation to each other by 120� and define the roll gap, three of such nozzle tubes branch off from the ring flange, with a piece of said tubes being bent around the respective periphery of the roll. The device as defined by the invention substantially comprises a stationary part and a rotating part 14. The stationary part 13 substantially consists of a ring flange 15 that is screwed to the roll cooling system 6, and a cylindrical part 16 that projects from said ring flange in the axial direction. In the present exemplified embodiment, the two rotational bearings 17 are arranged next to each other on said cylindrical part 16. The rotating part 14 of the device consists of a cylindrical part 18 which extends between the rolling stock and the cylindrical part 16 of the stationary part 13 of the device 1, said cylindrical part 18 extending against the rolling direction �R� across the stationary part 13 and into the zone of the ring flange 8. The inlet 19 for the coolant for the test coils 20, which is only indicated in FIG. 1, is located at that point. The connection 21 for said coolant inlet is shown in greater detail in FIG. 2. For sealing purposes, a gasket ring 22 is arranged between the rotating part of the device 1 and the ring flange 8 of the roll cooling system 6. A coolant channel extends from the coolant inlet 19 to the front side 23 of the rotating part of the device 1. Said coolant channel is designed in the form of a channel 24 extending around in the manner of a thread. The coolant channel 24 extending in the form of a thread changes on the front 23 of the device 1 into the individual coolant lines 25; the further extension of the latter is more clearly shown in FIG. 2.
In order to protect the test coils against damage and to assure that the test process is started only when material is in fact passing through between the test coils, which is relevant to the measurement, the test coils are first lifted from the rolling stock. This is accomplished, for example with the help of a tension spring 33, which engages the shorter leg 34 of the �L�. For the measurement, the rotational system has to have a defined rotation frequency. Said frequency is adequately high that the centrifugal force exerted on the leg 34 of the �L�, said leg being provided with a counterweight 35, will become higher than the force of the spring 33, causing the longer leg 31 of the �L� with the test coil 20 to move into the measuring position.
The same drawing shows an alternative to the above embodiment. Said alternative consists in that a small pressure medium cylinder 36 is arranged between one of the coolant lines 25 and the shorter leg 34 of the �L� of a test coil support 30 that is disposed opposite the test coil support 30 which is associated with said coolant line 25. The cylinder is connected with the coolant line 25 via a bypass line 37.
The measuring process starts in this connection only once an adequate water pressure prevails in the coolant line 25, said water pressure being adequately high for causing the cooling water fed into the cylinder 36 to press the piston and thus the piston rod of the pressure medium cylinder 36 downwards against the shorter leg 34 of the support 30, which causes the longer leg 31 of the �L� with the test coil 20 to move into the measuring position as well. Synchronizing elements not shown assure that all participating test coil supports 30 are swiveling synchronously.
FIG. 3, finally, shows by way of example how the coolant is fed to the individual test coils 20. In the present embodiment, a double-walled housing made of a ceramic material is arranged on the longer leg 31 of the �L� of the test coil support 30 in front of the test coil 20, whereby the cooling water flowing past the test coil 20 exits on the outer front side of the housing 38.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS2020067 *Aug 16, 1933Nov 5, 1935Siemens AgDevice for determining the temperature of electrically conductive bodiesUS3424976 *Mar 17, 1964Jan 28, 1969Krawczyk Eugeniusz MarianMagnetic device for determining defects in rod-like elements,cables,steel pipes and the likeUS4024470May 20, 1974May 17, 1977Republic Steel CorporationEddy current detector for hot test pieces having coolant fluid and purge featuresUS4461995Oct 29, 1981Jul 24, 1984Republic Steel CorporationCooling method and apparatus for eddy current flaw detectionUS4534405 *Jan 26, 1983Aug 13, 1985Voest-Alpine AktiengesellschaftMethod and an arrangement for inspecting the surface of steel stock having a temperature above the Curie pointUS4596953 *Apr 14, 1983Jun 24, 1986Daidotokushuko KabushikikaishaApparatus for scanning a material for detection of flaws and having material axis deviation detectionUS4644274 *Apr 1, 1983Feb 17, 1987General Electric CompanyApparatus for supporting an eddy current probe used to scan an irregular surfaceUS5187435 *Oct 10, 1990Feb 16, 1993Dr. Friedrich Forster Pruferatebau GmbH & Co. KGNon-destructive test apparatus with eddy current transducer rotary head and field homogenizing conductive ring for scanning metal test materialsUS5550468 *Mar 23, 1994Aug 27, 1996Institut Dr. Friedrich Forster Prufgeratebau Gmbh & Co. KgMethod and apparatus for adjusting the operating diameter of a probe in a rotating testing headUS6014024 *Mar 17, 1998Jan 11, 2000Battelle Memorial InstituteApparatus and method for detecting and/or measuring flaws in conductive materialGB2014317A Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleCN100458436CFeb 14, 2007Feb 4, 2009沈阳银捷机械装备制造有限责任公司Multifunction electromagnetic flaw detection deviceClassifications U.S. Classification324/224, 324/262, 324/238International ClassificationG01N27/90, B21B27/10, G01N27/72, B21B1/18, B21B38/00Cooperative ClassificationB21B2027/103, G01N27/9026, B21B1/18, B21B38/00European ClassificationB21B38/00, G01N27/90A1CLegal EventsDateCodeEventDescriptionMar 3, 2011FPAYFee paymentYear of fee payment: 8Mar 2, 2007FPAYFee paymentYear of fee payment: 4Feb 8, 2001ASAssignmentOwner name: GEORGSMARIENHUTTE GMBH, GERMANYFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHARLEMANN, HORST BY: SCHARLEMANN, BRIGITTE, SOLE LEGAL HEIR;REEL/FRAME:011578/0910Effective date: 20010130Owner name: GEORGSMARIENHUTTE GMBH NEUE HUTTENSTRASSE 1D-49124Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHARLEMANN, HORST BY: SCHARLEMANN, BRIGITTE, SOLE LEGAL HEIR /AR;REEL/FRAME:011578/0910RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services