Патент USA US2409556код для вставки
@Ct. 15, ' FLAW DETECTOR H. C. DRAKE FOR TUBING Filed June 16, 1944 2 Sheets-Sheet 1 45 60 Oct._15, 1946. H. c. DRAKE 2,409,554 - FLAW DETECTOR FOR TUBING Filed June 16, 1944 2 Sheets-Sheet 2 IN VEN TOR. BY Patented Oct. 15, 1946 - 2,409,554 UNITED STATES PATENT‘ OFFICE FLAW nn'rsc'roit FOR TUBING Harcourt 0. Brake, Hempstead, N.Y., assignor to Sperry Products, Inc, Hohoken, N. J., a corpo ration of-New York ‘ ‘ Application June 16, 1944, Serial No. 540,674 4 Claims. (Cl.175----183) ’ 2 ‘ . This invention relates to flaw detector means ‘ is passed through an‘energizing coil H which is for detecting defects in metallic tubing. More particularly the invention relates to the type of tubing tester known as the Sperry detector mech- designed to energize thetube It with ?ux to generate eddy currents therein. The currents thus generated will be constant except in the anism wherein the tubing is energized with flux 5, region of flaw where a different amount of eddy and moved relatively to a pair of detector coils ‘ currents will be generated. Such Variations in designed to detect regions of non-uniformity in induced currents caused by flux may be detected the tubing caused by the presence of ?ssures or . by means such as a pair, of ‘opposed induction other defects- 'When a, length of tubing is passed coils i2 surrounding the tube It. The coils i2 through such a detector mechanism, the ends of 10 are of equal inductance and connected in oppo the tubing cause a large distortion in the ?ux ‘ sition and are normally equally affected, but when > ' distribution in the tubing and in the’ region sur- a region‘of flaw occurs, ?rst one and then the . rounding. the tube so thatthe detector coils give an indication in the same manner as when a ?s- other of the coils will have a different E.‘ M. F. induced therein togenerate a differential E; M. F. sure is‘ present. The effect of the distortion 1;; which after being suitably ampli?ed by an am caused by the end of the tubing carries over for pli?er 15 may‘ be caused to operate a suitable in a considerable length of the, tubingand if a‘ true dicator shown ‘diagrammatically ati?. The tube defect occurs within or adjacent to this end dis- " it! may be guided through the‘ energizingmcoil H tortion, such defect may'easily be missed. It is, and detector coils lii'by means‘ cf‘pairs of guide therefore, desirable that two conditions exist dur- 20 rollers i1, G8, I!) and may be driven by means of ing the testing of tubing, as follows: (1) that the a power driven roller 20 which is rotated fron'ua region of distortion be confinedto theminimu‘r'n Source of power not shown. ' ‘ H be rendered ineffective for the‘ interval during said end is’so diffused as to cause alarge distor- I which the end‘efiect is present so that if a true defect occurs adjacent this region, it will not be tion beginninguata point substantially before‘the end. This distortion would‘ Ordinarily be picked confused with the indication which wouldother- up by the detector coils i2 in the same manner possible length of tubing, in otherv words, so’that As ‘set forth in the introductionjhereto,‘ as the the end e?ect previously described be held to a end of the tubing "3 aphl‘?aches‘ the detection minimum, and (2) that the indicating mechanism 25 coils" IE’ it is found that the ?ux distribution in wisebe producedby the endle?ect.” ‘ ‘. , 30 as a ?ssure or other true defect and‘would re It is, therefore, the principal object of niy insuit in a large series of indications on the indi vention to accomplish both of the desired results catineimechanism‘ is. ‘If a true defect Occurred settforth above. I reduce'the regionof end efadjacent this region 0i, and effect, it would be iect of the tubing by causingr thetubes to be. fed _ impossible 130‘ dis’frillglli?hv it from the indications through the detector mechanism in end to end 35 caused by'the end e?ect, Therefere, as Sta-ted in contact. This has been found to reduce the to- ' the introductionkit is desirable first that the end tal end effect to a substantial degreebelowf that effect behcld‘to a minimum‘and second, that the which would exist if the tubes'urere, fed'insepindicating mechanism bej'rendered ineffective ‘dur- ‘ ‘ arately in spaced relation. For accomplishing ing the interval thatthe portion ofthe tubing the second object, namely, cutting out the new 40 subject jttoend effect is passing the detector coils indication during the passage of the tube end past ‘ ' v; ‘ “ ‘ > the detector coils, I provide the ‘novel mechanism . ' I l2. ‘_ For accomplishing the ?rst of ‘these objectsQI to be describedhereinafter. ‘ ' ‘ ' I“ \' I U provide ‘for feeding the tubes through the detec Further objects and advantages of this invene tor-mechanism in ‘end-to-end' contact.’ Thus the ' tion will become apparent inthe following; de- 45 forward end of. tube H1’ is in contactv with the tailed description thereof. ,In the accompanying drawings,._ . , A ’ , f ‘Fig.’ ‘l isv aefront' elevation,v largely ‘diagram? niaticjand. partly sectioned,'showing"one ,f oi‘roy invention. ‘ . . - . ' _ ' Fig.‘_2_is.a§view similar to Fig.‘ l“‘,'“bu_tshowing rear'end of tube“ l9, forming Va'closed joint. ‘in ' this...fashion‘v it ‘has been found that the ‘total lengthoi‘t ‘hing subjecttov end e?ect is substane reducedjf‘rom; that which would result it ‘1 the" ti; “ ub'es‘jwere H ‘ V v v ‘ 60 ifed V through the detéctorrriechw nisiniri'spacedlrelation. ‘ ' \' ' the parts in ‘adifierent operative‘ position. j ' or accomplishing-the second‘ of the‘above ob‘ ) liteferringvtoehig. 1 of ‘the. drawings, there 7 ijects, namely, to cutout the indicating mecha di'sclosed a form ‘of Eperryl ‘flaw detector for tub-v nisn'ii‘rthat is,_to ‘render it ineffective, ‘during'the ins which; 31 length‘ ‘or "canine j is: ,tofbe tested as interval-‘that the ends of the‘tuhes- subiectrtd end 3 2,409,554 eifect are passing the detector coils I2, I provide novel means for short-circuiting the indicating mechanism during this interval. This novel means insures that the indicating mechanism Will trolled by the passage of the tubing through the detector mechanism. To accomplish these re sults, the succeeding is fed toward the upper end of roller 20 and then passing the tube underneath a roller 26 whose lower end is below the lower ends of upper guide rollers i8 and H3. ergized when slide 32 drops from the rear end of tube E0 to the forward end of tube l0’ which is at a lower level. However, tube I ll’ soon rides up on roller 20 to the same level as tube ll], thus, again opening contacts 33 and 34. normally de-energize magnet 40 and cause latch 4! to engage the surface of roller 4.3. Because the time interval during which contacts 33 and 34 are closed is very short, it is possible for latch 4| to drop and engage lug 42 before the roller 43 has rotated suf?ciently to prevent such engagement. This is not desirable and therefore 60 is provided on the roller 43 with its leading edge The result is shown in Fig. 1 wherein the forward i so positioned that a set Of contacts 62 is closed as soon as .roller, 43 starts to rotate. This set of end of tube in’ strikes the rear end of tube I0, but is below the level of tube l8. As the tube It? contacts closes a holding circuit through mag net 40, said circuit including the battery 64 so rides up on power roller 29, ‘ that even when contacts 3-3 and 34 open, magnet 43 remains energized until the rear end 65 of cam 60 passes beyond contacts 62 to permit said con in level between the incoming and the outgoing tacts to open. This releases the latch 4| which is then in position to engage lug 4?. when the roller 43 completes a revolution. In accordance with the provisions of the patent tubes is utilized to operate the cutout mechanism for rendering the indicator ineffective for the in terval that the ends of the tubes subject to end eifect are passing the detector coils l2. For this purpose, a lever 38 is provided,‘ said lever being pivotally mounted at 3| and carrying statues, I have herein described the principle and at its forward end a slide 32 adapted to slide on the upper surface of the tubes and having at its ' other end an electric contact 33. The slide 32 normally rides upon the upper surface of tube it! to maintain contact 33 out of engagement with contact 34. When the slide 32 passes over the rear end of tube In and drops down to the lower level of the forward end of tube I 0', before the latter rides up on roller 28, the lever 30 is rotated by spring 35 to cause contacts 33 and 34 to close and energize a magnet 40 which then attracts a, latch 4| normally in engagement with a lug 42 on a roller 43 which is adapted to ‘be driven from power roller 20 by any suitable means such trative and that the invention can be carried out by other equivalent means. Also, while it is de signed to use the various features and elements in the combination and relations described, some . of these may be altered and others omitted with out interfering with the more general results out lined, and the invention extends to such use. Having described my invention, what I claim and desire to secure by Letters Patent is: . 1. In a flaw detector mechanism for tubing, as ?exible drive 45 through reduction gear 44 and a friction clutch 41. Normally Since the drive of roller 43 and the feeding of tubes i0 and I0’ have de?nite correlation, means are provided whereby after a for moving said last-named end into alignment, and means actuated by said last-named end when moving into alignment for rendering effective the means for rendering the indicating means inef fective during the passage of the joint past the ?aw responsive means. 2. In a ?aw detector mechanism for tubing, said mechanism comprising means for energizing sponsive means, the ends of the tube causing ?ux variations similar to those caused by a flaw. short circuit the input to ampli?er l5 and hence to render the indicator l6 ineffective. The length means for moving the tubes through the detector mechanism‘with the ends of adjacent tubes ‘in contact to form a closed joint whereby the re gion of end effect is reduced, means for rendering of_-_lcam 5| is such that the rear end 53 thereof the indicating means ineffective during the pas~ willypass contacts 52 and permit the-.‘s'ame to openlwhenieintd has reached" ositi‘on‘D“ f . As described hereinbefore} the magnet teaser: sage of said joint past the ?aw responsive means, said last-named means comprising ‘rotatable means normally,helda'gainst rotation, means for maintaining the adjacent end'of cheer the tubes 2,409,554 at a joint initially out of alignment, means for end to alignment and until said joint has passed beyond the flaw responsive means. moving said last-named end into alignment, and means actuated by said last-named end when mechanism comprising means for energizing the moving into alignment for setting said rotatable means into rotation. 3. In a ?aw detector mechanism for tubing, said mechanism comprising means for energizing the tube with ?ux, means responsive to variations 4. In a flaw detector mechanism for tubing, said tube with ?ux, means responsive to variations in flux in the tube, and indicating means adapted to be actuated by variations in the responsive means, the ends of the tube causing ?ux varia tions similar to those caused by a flaw, means for in flux in the tube, and indicating means adapted 10 moving the tubes through the detector mechanism with the ends of adjacent tubes in contact to to be actuated by variations in the responsive form a closed joint whereby the region of end means, the ends of the tube causing ?ux varia effect is reduced, means for rendering the indi tions similar to those caused by a flaw, means for cating means ineffective during the passage of moving the tubes through the detector mechanism flaw responsive means, said with the ends of adjacent tubes in contact to form ~ said joint past the last-named means comprising rotatable means a closed joint whereby the region of end effect normally held against rotation, means for main is reduced, means for rendering the indicating taining the adjacent end of one of the tubes at a means ineffective during the passage of said joint joint initially out of alignment, means for moving past the flaw responsive means, means for main said last-named end into alignment, means actu taining the adjacent end of one of the tubes at 20 a joint initially out of alignmen , means for mov ing said last-named end into alignment, and means actuated by said last-named end when moving into alignment for rendering effective the means for rendering the indicating means ineffec tive, and means for maintaining effective the means for rendering the indicating means inef fective after the restoration of said last-named ated by said end when moving into alignment for setting said rotatable means ‘into rotation, and means for continuing the rotation of said rota table means after the restoration of said last named end to alignment and until said joint has passed beyond the ?aw responsive means. HARCOURT C. DRAKE.