US931897A - Method of removing scale from metal pipes. - Google Patents

Description

O. THIBODEAU. METHOD 0F EEMOVING SCALE PROM METAL PIPBS. running uns uov.1a, 1901.

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qmlhnww C. THIBODEAU. METHOD 0F BBMOVING SCALE FROM METAL PIPEB.

APPLIOATIOI FILED NOV. 13. 1907.

Patented Aug. 24. 1909.

@9i/Imanes: ovm f m yspective rolls screws 12 in manner similar to that described with respect toshafts 2, 3.

Any suitable number of pairs of rolls may be provided for the purpose having the passes between the rolls aimed, the pairs of rolls being in relatively close proximity to each other as illustrated, and the arrangement of the adjustable shafts is such that uniform pressure of all the rolls may be exerted upon the pi e being treated, whereby the first pair of ro will be adjusted to exert sufiicl'ent pressure upon the pipe passing between them to loosen the scale'on the exterior and interior of the pipe with slight alteration ofthe diameter 4of the i e, and whereby the second pair of rolls, w e exerting the same ressure on the pipe asthe first air of rollii, the pressure of the ipe by the ifi'erent pairs of rolls being in of direction at right angles to each other has no further tendency to reduce the sizc of the ipe, but serves to remove any flat places t at may have formed in the ipe by the first' pair of rolls and td keep tiiepipc straight. Where more than two pairs of rolls are used the axes of ad'acent pairs of rolls are arranged substantially at right anles to each other, as shown in Fig. 2, where have shown four pairs of rolls arranged to operate in manner`set forth respectingrolls 4 and 5 and theirshafts 2 and 3, iwhereb f the adjustable shafts of al1 the pairs of rol s may be similarly adjusted to cause their reto exert uniform' pressure upon 1 e.

iihel rolls are to rotate in aforward direction and at the same surface speed so as to carry the pipe or tubing between them from one end to the otherand the corresponding pairs of shafts'are geared together so that their ad'oining surfaces will respectively rotate su stantiallly as shown by the arrows in Fig, 4. For t lis purpose I have showngears 18, 19 on the pairs of, shafts and res ectively meshing as shown, and of ual ameter to cause the surface s eeds o the rolls to be the same. To drive a the rolls and their shaftsin the same direction at the 'same speed I have shown adrive shaft 20 journaled insuitable bearings 21 on frame 1 .and carryinggears 22 meshing withgears 23 carried byshafts 24 extending across frame 1 and supported in suitable bearings and carrying at their opposite ends each agear 25 meshing with aear 23 on shafts 2J to drive the upward y' inclined shafts on the side of the frame oppositeshaft 20. Uponshaft 20 is also secured agear 27 that meshes with a gear 28- secured on cross shaft 429 journaled 1n frame 1, whichshaft 29 carries a gear 30 meshin with a.gear 31 secured on ashaft 32 journ ed in frame 1 on the side oppositeshaft 20. Secured to shaft, 32 aregears 33 that mesh withgears 34 secured onshaftsv 35 journaled in and extending across frame 1. Shafts 35, at their ends'opposite gears 34, carrygears 36 that mesh withgears 37 secured on shafts14. The arrangement of the gearing shown is such that whenshaft 20 is rotated in a suitable direcmay be arran ed as shown inFig. 5. For

this purpose t e upper end of the shaft is shown reduced in diameter providing a shoulder a, and the roll fits upon said re'- duced end of the shaft and against said shoulder, suitable means,such asa ke 38 being provided between theshaft an roll for rotating the latterby the former,`and anut 39 screwed u on the outer end of the shaft holds the roll securely thereon and in true osition against the should'er. B y having t e rolls detachably connected Wlth the shafts on the portions above and beyond the bearings for the shafts, the rolls may be readily removed and replaced without distu rbing t e shafts in their bearings.

ln tre ing the ipe to loosen and remove, the scale from t e interior and exterior thereof, and also to maintain as nearly as possible the original diameter of the pi ebelng treated, by the rolls, I adjust al the rolls to exert uniform pressure upon the pipe, and cause the rolls to exert such light pressure upon the pipe as will be just sufficient to loosen the scale on the walls of the pipe while reducing the diameter' of the pip'e as little as possible. The light pressure of the first pair of rolls u on the pipe will loosen the scale and as t e `remaining rolls are adjusted to exert a pressure on the ipe that is uniform with the first pair of ro no further reduction of the -diameter of the pipe will be made b the remaining rolls, and this is also effects b having uniform surface speed of all the ro s so that there will be no tendency to distort the pipe by a non-uniform action thereon of any of the rolls.

By arranging the adjacent pairs of rolls with their axes substantially at right angles to each otherthe effect is that if the first air of rolls should roduce afiat or indentedp ace or surface in t e pipe or. tubing passing between them, the-next adjacent pair of rolls running at right angles to the first named pair, will so act upon said pie as said fiat places or surfaces such uneven or distorted portion of the pipe and restore the latter to its normalpr original condition, and the remaining palrs of rolls will continue to so-act on any remalmng to remove pressure on distorted or raised parts of the pipe. As the rolls through which the pipe asses after being acted upon by the iirst pair of rolls do not exert any greater ressure on the pipe than the first pair of ro ls, there is no tendency of the remaining rolls to reduce flat places in the pipe but they mere `ylgaet to remove flat laces in the pipe made y the first pair of ro s, and assist m feeding the pipe without altering its diameter, and, further serve to maintain the straightness of the pipe and prevent the same from bending or twisting 1n its passage 'through the machine. Furthermore, the arran ement of having the different pairs of rolls a jacent to each other 'with their axes at an angle to each other is such that the eiiect of any one pair of said rolls in squeezing the pi e for removing the scale must necessarily Ibe limited or controlled by the action of the pair or pairs of rolls adjacent thereto, with the result of adding one force to another and thereby forming a resultant force which has a diierent effect from either force acting independently. For example, while the compression of the pipe at a particular place produced by one pair of rolls must exten-d along the wall of the pi e beyond such rolls as far as the adjacent ro ls, the compressing force exerted by such pair of rolls would necessarily be met substantially one-half way between said rolls and the adjacent rolls by the compressing force exerted by the last mentioned rolls. The Walls of the pi e are thus manipulated to a degree not be ore known whereb the scale from the pipe is more effective y removed. I am aware that pipes have been passed between rolls to loosen the scale, but such rolls as known to me have not been located with the axes of one pair of rolls at an angle to the axes of another pair of rolls and the force exerted upon the pipe by one such pair of rolls in line with the force exerted u on the pipe by the other pair of rolls, and ence the same character of operation is not produced as in accordance with my invention. I am also aware that rolls have been provided with passes between them of unequal diameter and which revolve at different sgeeds, and also that rolls have b een provide at an a le to each otherforpollsh- 1n round bars. uch arrangement o angular y disposed rolls, have not, so far as I am aware, been provided for loosening the scale upon and within pipxe whereb the first pair o rolls will loosen t e scale o the pipe, and the second air 0i rolls will remove Hat places formed in the pipe by the first pair of rolls and restore and preserve the cylindrical form of the pipe without reducing the diameter of the same. y

The articular arrangement of gcarin g n nd other etails of construction shown und described may be variedwithin the scope ol' the appended claim without departing rom the splrit of my invention.

Having now described my invention what I claim is:

The method of removing scale from the wall of metal pipe, consistingl in applying sufficient pressure to the exterior wall thereof to remove the scale without materially reducing the diameter of said pi e, said pressure beine applied in lines o direction at right angles to each other and at points in close proximity and caused to travel lon0fi tudinally with respect to the pipe, whereby the shape of the lpe is preserved.

Signed at Che sea, in the county of Suffolk, and State of Massachusetts, this eleventh day of November, A. D. 1907.

CHARLES THIBODEAU.

Witnesses:

CHAs. F. PERKINS, EvERE'r'r N. Cmrris.

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