US3331597A

US3331597A - Tilting burner mount

Info

Publication number: US3331597A
Application number: US395212A
Authority: US
Inventors: Robert J Best; Roger W Tuthill
Original assignee: Air Reduction Co Inc
Current assignee: Airco Inc
Priority date: 1964-09-09
Filing date: 1964-09-09
Publication date: 1967-07-18
Anticipated expiration: 1984-07-18

Description

July 1s, 1967 R. J. BEST ETAL TILTING BURNER MOUNT Filed Sept. 9, 1964 INVENTORS ROBERT J.

ROGER BEST' W. TUTH/Ll. BY

bmkkkem A TTOR/VEV United States Patent O 3,331,597 TILTING BURNER MDUNT Robert J. Best, Myersville, and Roger W. Tuthill, Monntainside, NJ., assignors to Air Reduction Company, In-

corporated, New York, N. a corporation of New York Filed Sept. 9, 1964, Ser. No. 395,212 Claims. (Cl. 266--23) This invention relates to scarfing apparatus in which jets of oxygen are projected against the heated surface of a slab, billet, or other work piece to remove the surface metal and imperfections therein from the work piece preparatory to rolling or other operations on the work piece.

During a scarling operation, the burner is held close to the surface that is to be scarfed, and it is common practice to have a shoe or other bearing surface on the burner in position to rub directly on the surface of the work piece. The burner is held with the shoe in contact with the work piece by yielding means that permit the burner to move up and down to follow variations in the contour of the work piece surface and to follow the surface when the Work piece is warped or bent.

The scarng burner is held against movement in the direction of the relative movement of the burner and work piece, and very often an irregular, projecting piece of metal on the work piece will strike a burner and bend or break the burner or the support so that the apparatus cannot be operated again until costly and time-consuming repairs have been made.

Conventional scarng apparatus often has a plurality of burners located sde-by-side across each surface to be scarfed, and these burners or their holders are designed to break away individually from one another if struck by metal projecting from a work piece at a location which catches on a burner.

It is an object of this invention to provide improved supporting means for a scarng burner, and to hinge the supporting means so that the burner can swing against a yielding force that softens the blow and prevents damage to the apparatus if the burner is struck by a metal projection or other obstruction.

Features of the invention relate to the combination of a spring with specific operating mechanism and to the particular kind of `spring used for yieldably holding a scarng burner in working position; and tol provision for damping the spring action to prevent oscillation of the burner along the work piece.

Another object is to provide scarfing apparatus having a support for yieldably holding a burner against movement with respect to a supporting mount and in the direction of movement of the work piece, and with other yielding means for holding the burner and supporting mount assembly in position to maintain the burner adjacent to the surface of a work piece on which the burner is operating.

Other objects, features and advantages of the invention will appear or be pointed out as the description proceeds.

In the drawing, forming a part hereof, in which like reference characters indicate corresponding parts in all the views:

FIGURE 1 is a diagrammatic side elevation of scarfing apparatus made in accordance with this invention; and

FIGURE 2 is a fragmentary rearward view of a portion of the apparatus shown in FIGURE 1.

A slab or work piece 10, which is to be scarfed, is advanced in the direction indicated by an arrow 12 along a conveyor 14 having rollers 16 which support the work piece 10. There is a space Ibetween the rollers 16 at a scarng station and a scarng burner 20 is held in a position adjacent to a bottom surface 22 of the work piece 10. This invention will be described in connection with the Iburner 20 which scarfs the bottom surface 22, but it will be understood that there are other burners for simultaneously scarfing the other sides of the work piece 10; and this invention may be applied to these other burners.

The burner 20 directs pre-heating and scarling jets against the work piece y10 in a direction opposite to the direction of movement of the work piece. The direction of impingement of the jets from the burner 20 against the work piece 10 is indicated by the arrow 24 in FIG- URE l. The scarng jets are located along a row extending transversely of the work piece 10 so that the entire bottom surface is scarfed in a `single operation.

The scarng burner 20 is supported by a mount or mounting frame 30 having a relatively-fixed part 32 secured to structure 34 of the scaring apparatus. The mounting frame 30 also has a movable part 36 attached to the relatively-fixed part 32 by hinge means 40.

The hinge means 40 includes a shaft 42 which serves as a pin for the hinge means. This shaft 42 extends through side portions 44 of the movable part 36 and through a middle portion 46 (FIGURE 2) of the relatively-fixed part 32 of the mounting frame 30. A set u screw 48 holds the shaft or pin 42 against axial movement.

The yburner 20 has abracket portion 50 which lits over the upper end of the movable part 36 of the mounting frame 30 and the bracket portion 56 of the burner is attached to the movable part 36 of the mounting frame 30 by fastening means, such as screws S2 (FIGURE 1).

In the preferred construction, the burner 20 has a shoe 56 that rubs along the bottom surface 22 of the Work piece and the bearing surface of the shoe 56 is located behind a plane 58 which extends through the axis of the shaft 42 and at right angles to the bottom surface 22 of the work piece 10. The entire portion of the burner 20, which is adjacent to the bottom surface 22, is located behind (to the left in FIGURE l) the plane 58 so that, if an irregularity extending from the bottom of the work piece 10 strikes the burner 20 and swings the burner about the axis of the shaft or pin y42, the burner moves away from the work piece instead of jamming against it, as would Ibe the case if the shoe 56 and adjacent portions of the burner were located in front (to the right in FIG- URE l) of the plane 58.

Forward-swinging (clockwise) movement of the burner 20 about the hinge shaft or pin 42 is limited by a block 62 secured to the front of the movable part 36 of the mounting frame 30 by fastening means including screws 64. This block 62 extends downward below the shaft 42 and strikes against a surface 66 of the relatively-fixed part 32 of the mounting frame 30 so that the mounting Villustrated and described,

frame cannot move any further than into a straight up-V and-down position when the movable part 36 swings clockwise. There are screws 68 threaded through the block 64 for adjusting the heights of the burner 20 with, Y respect to the mounting frame 30. These screws 68 are the mounting frame 30, by a block 78. This block 78 is held against the spring 74 by screws 89 which extend through the block 78 and spring 74 and which thread into the relatively-fixed part 32 of the mounting frame 30. A part of the block 78, which extends upward, has a front surface 82 that curves away from the spring 74. This curved surface 82 controls the bending of the spring 7S and has the eifect of shortening the free end of the spring 7 4, and thus increasing the spring rate as the spring bends toward the left in FIGURE 1. A position of the spring 78, when bent back by a substantial distance, and adjacent parts of the mounting frame 30, are shown in dotted lines in FIGURE 1. s

Although the part 36 of the mounting frame 30 can be made to bear directly against the front leaf of the spring 74, the preferred construction of the invention has a shim 86 attached to the part 36 of the mounting frame 36 by screws 88, and this shim 86 moves along the surface of the spring 74 as the burner 20 swings counterclockwise in FIGURE l. The extent of this movement is indicated vby a dimension arrow 90 in the drawing.

The leaves of the spring 74 also move on each other as the spring bends, since the leaves a-re clamped together only at their lower ends by the screws Sii. This movement of the shim 86 and movement of the spring leaves on one another creates friction for dampening the operation of the spring and thus prevents the spring from oscillating and causing the burner 20 to oscillate back and forth with resulting variations in the application of the scarling jets to the work piece.

The structure 34 of the scarng apparatus holds Ythe mounting frame 30 against movement in the direction in which the work piece travels, but in the preferred construction the structure 34 is movable up and down toward the work piece so as to carry the burner 26 into contact with the work piece for a scariing operation. The means which hold the burner up against the'workpiece are yielding means so that the burner 20 can move up and down to follow the contour of bent slabs, and provision is sometimes made for permitting rocking ofthe burner to follow the contour of a warped slab. Details of this apparatus for holding the burner against the work piece are not a part of this invention but it is a feature of the invention and the assembly described can be carried by Y structure 34 which is movable up and down by yielding means for maintaining the burner 20 in contact with the work piece. VAlthough the structure 34 is held against movement in the direction of movement of the work piece 10, and against transverse movement, it can only be de- Y scribed as relatively-fixed or relatively-stationary, be-

cause of its up-and-down movement.

FIGURE l shows diagrammatically a mechanism for raising and lowering the structure 34. This `structure is shown connected to a fixed element 94 by a pivot c-onnection 96; and there is a cylinder-and-piston motor 98 which is supplied with working uid through piping 102 and 104 to move the structure 34 angularly about the pivot connection 96. Valves 106 are operated to control the supply and exhaust of working fluid in the piping 192 `and 104 to control the operation-of the cylinder-andpiston motor 93.

The preferred embodiment of the invention has been but changes and modications can be made and some features may be used in dierent combinations without departing from the invention as defined in the claims.

We claim: Y

1. A scarng apparatus comprising a scarling burner mounting means, a scariing burner which directs oxygen jets against the work piece in a direction substantially opposite to the movement of the work piece, said burner attached to said mounting means and having a work piece abutting surface, said mounting means including a mounting'frame comprising a relatively-fixed part, and a movable part having mounted thereon said scarng burner, hinge means by which the movable part is attached to the relatively-fixed part of the frame, the hinge means having an axis extending transversely of the direction of movement of a work piece with respect to said burner and positioned in a plane normal to the workpiece surface Yat the lmost forward point of contact between the work piece and said abutting surface of said burner or forward thereof, and spring means yieldably resisting the swinging of the movable part in a direction to permit said burner to move for a limited distance with a work piece having an irregular portion that strikes against the burnerV during a scarng operation.

2. The scarfing apparatus described in claim 1 characterized by the spring means being oriented to resist rea-rward movement of the movable part, and an adjustable stop for limiting forward movement of said movable partof the frame by said spring means.

3. The scarng apparatus described in claim 1 characn terized by the spring means including a leaf-spring, a portion of which extends behind lthe movable part of the mounting frame and another portion ofgwhich extends behind the relatively-fixed part of the mounting frame.

' 4. The scariing apparatus described in claim 3 characterized by an abutment surface behind the spring and extending behind the portion of the spring that is behind the movable part of the mounting frame and curving awayV mounting frame.

6. In scariing apparatus inwhich a work piece moves with respect to a scarng burner that directs oxygen jets against the work piece in a direction substantiallyV opposite to the movement of the work piece with respect to theV burner, a burner, a supporting frame for the burner, a pivot by which the supporting frame is connected with a relatively stationary part of the apparatus and on which the supporting frame swings rearward in the direction that the work piece is moving to relieve shock on the burner as it is struck by an 4irregularity of the work piece,

spring means for returning the burner to its forward posi-y tion after the irregularity passes, and a stop for determining the forward position of the support.

7. The scarng apparatus described 1n claim 6 characterized by a conveyor along which successive work pieces travel, means holding the relatively stationary part of the apparatus in position to hold the burner in contact with the surface ofthe work piece to be scarfed, thestop for determining the forward position of "the support being Y on the relatively stationary part Vof the apparatus.

S. The scarng apparatus described in claim 7 characterized by the stop for determining the forward positionk of the support being adjustable to vary the forward position of the burner with respect to the apparatus, and the means for holding the relatively stationary part of the apparatus in position being a yielding means having movement for shifting the burner support toward and from the work piece but having means holding it against shifting in the direction in which the. supporting frame swings rearwardly. n

9. The scariing apparatus described in claim 8 charac- 5 6 terzed by the spring being a leaf-spring and the support References Cited having an abutment surface that slides on the leaf-spring as the spring bends, whereby movement of the spring is UNITED STATES PATENTS damped to prevent oscillation of the burner. 2,282,397 5 1942 Deck 266-5 X 10. The scarn-g apparatus described in claim 6 charac- 5 2,547,993 4/ 1951 Benz. terized by a conveyor along which the work pieces travel, 2,312,174 11/1957 Garrison 266-.23 X

the scarng burner having a surface thereon which bears against a surface of a Work piece on the conveyor during JOHN R C AMPBELL Pfl-mm3, Examl-eh relative movement of the Work piece and the burner, said surface of the burner being located rearward of a plane 10 R. D. DROPKIN, Assistant Examiner. intersecting the axis of the pivot and normal to the work piece surface.

Claims

6. IN SCARFING APPARATUS IN WHICH A WORK PIECE MOVES WITH RESPECT TO A SCARFING BURNER THAT DIRECTS OXYGEN JETS AGAINST THE WORK PIECE IN A DIRECTION SUBSTANTIALLY OPPOSITE TO THE MOVEMENT OF THE WORK PIECE WITH RESPECT TO THE BURNER, A BURNER, A SUPPORTING FRAME FOR THE BURNER, A PIVOT BY WHICH THE SUPPORTING FRAME IS CONNECTED WITH A RELATIVELY STATIONARY PART OF THE APPARATUS AND ON WHICH THE SUPPORTING FRAME SWINGS REARWARD IN THE DIRECTION THAT THE WORK PIECE IS MOVING TO RELIEVE SHOCK ON THE BURNER AS IT IS STRUCK BY AN IRREGULARITY OF THE WORK PIECE, SPRING MEANS FOR RETURNING THE BURNER TO ITS FORWARD POSITION AFTER THE IRREGULARITY PASSES, AND A STOP FOR DETERMINING THE FORWARD POSITION OF THE SUPPORT.