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Publication numberUS3736615 A
Publication typeGrant
Publication dateJun 5, 1973
Filing dateJun 8, 1971
Priority dateJun 8, 1971
Publication numberUS 3736615 A, US 3736615A, US-A-3736615, US3736615 A, US3736615A
InventorsKumaki K
Original AssigneeNakamichi Kikai Co Ltd, Nichimen Co Ltd, Nippon Pneumatic Manuf Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Slag removing equipment for high temperature furnaces
US 3736615 A
Abstract
Slag removing equipment for removing slag from high temperature furnaces. The equipment has a power-driven casing mounted so as to be capable of travelling on the furnace. A power-driven rotary table is mounted on the casing so as to be capable of rotating horizontally, and a power-driven vertical cylindrical member is mounted on the rotary table so as to be capable of inclining. A power-driven movable cylinder is elevatably mounted on the cylindrical member, the movable cylinder being provided with collecting claws at the lower end thereof. A power-driven impact hammer is elevatably mounted inside the movable cylinder, and has an impact hammer provided with a chisel at the lower end thereof which is capable of extending out of and withdrawing into the lower ends of the collecting claws.
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Description  (OCR text may contain errors)

United States Patent [191 Kumaloi [54] SLAG REMOVING EQUIPMENT FOR HIGH TEMPERATURE FURNACES [75] Inventor: Kozo Kumaki, Osaka, Japan [73] Assignees: Nakamichi Kikai C0., lLtd.;

Nichirnen (10., Ltd.; Nippon Pneumatic Manufacturing Co., Osakashi, Osaka-fu, Japan [22] Filed: June 8,1971

[211 App]. No.: 150,967

[52] US. Cl. ..15/1114.1 C, 266/5 S [51] Int. C1. ..C2lld 9/711 [58] Field of Search ..l5/l04.l C, 246.5, 15/104.07; 75/30; 266/25, 31, 2 R, 5 S; 263/29, 15, 11; 214/18 R; 13/6, 33; 299/64, 69, 70, 36, 67; 173/35, 46, 43; 175/17; 192/144 [56] References Cited UNITED STATES PATENTS 3,171,736 3/1965 Debenham ..2l4/l8 R 1,347,332 7/1920 Hopkinson ..299/67 3,471,888 10/1969 Grant et al. ..l5/l04.07 3,550,177 12/1970 Darr ct al ..lS/104.l C

[ 1 June 5, 1973 FOREIGN PATENTS OR APPLICATIONS 1,195,786 1/1964 Germany ..266/5 S Primary Examiner-Leon G. Machlin Attorney-Wenderoth, Lind & Ponack [57] ABSTRACT cal member is mounted on the rotary table so as to be 1 capable of inclining. A power-driven movable cylinder is elevatably mounted on the cylindrical member, the movable cylinder being provided with collecting claws at the lower end thereof. A power-driven impact hammer is elevatably mounted inside the movable cylinder, and has an impact hammer provided with a chisel at the lower end thereof which is capable of extending out of and withdrawing into the lower ends of the collecting claws.

1 Claim, 2 Drawing Figures PATENTEBJUK I915 3,736,615

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INVENTOR.

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ATT ORNEY S SLAG REMOVING EQUIPMENT FOR HIGH TEMPERATURE FURNACES This invention relates to equipment for removing slag in high temperature furnaces, and more particularly for removing ore slag, steel slag and the like which are deposited in high temperature furnaces, such as annealing furnaces, furnaces and the like, by crushing and discharging said slag through a predetermined discharge the conventional method has a further defect in that the manual removing operation is not only inefficient but unsatisfactory for the complete removal of slag.

A first object of this invention is to provide equipment for automatically conducting a slag removing operation by crushing the slag with an impact machine making use of compressed air and then mechanically removing said slag with collecting claws, thereby obviating the defect of the conventional manual removing method described hereinbefore.

A second object of this invention is to improve the furnace operation efficiency as well as the thermal efficiency by removing the slag before the temperature inside the high temperature furnacefalls.

These and other objects are accomplished by the parts, improvements, combinations and arrangements comprising the invention, a preferred embodiment of which is shown by way of example in the accompanying drawings, and herein described in detail. Various modifications and changes in details of construction are comprehended within the scope of the appended claims.

Referring to the drawings:

FIG. 1 is an elevation of vertical section showing an embodiment of the slag removing equipment according to this invention.

FIG. 2 is a lateral view of vertical section of the same.

The slag removing equipment according to this invention has a rail 12 provided on each side of the opening at the upper end of the furnace l1 and a casing 13 which is movable on said rails 12. On said casing 13 are provided bearings 14 on both the right and the left sides thereof respectively, the shaft 16 of wheels on the rails 12 being rotatably fitted in each of said bearings 14. lnside the casing 13 is secured an oil motor 17, the output axis thereof being connected to a driving rod 18 rotatably mounted inside the casing 13. The driving rod 18 is so arranged as to be in parallel with the shaft 16, an endless transmission chain 21 being wound around a chain wheel 19 secured to said driving rod 18 and a chain wheel 20 secured to said shaft 16 so as to rotate the driving rod 18 according to the forward and reverse rotation of the oil motor 17, thereby enabling the catsing 13 to travel on the rails 12 forwardly and backwardly with the rotation of the wheels 15.

A heat resisting member 22 is spread over the underside of the casing 13 to intercept the heat inside the furnace 11, a circular aperture 23 being formed in the center of said heat resisting member 22, an annular frame 24 being secured concentrically with the aperture 23 to the upper external of said aperture 23.

The numeral 25 designates a rotary table rotatably fitted to the inside of said annular frame 24, said annular frame 24 which is cone-shapedl on the inside thereof being provided with a number of guide rollers 26,27 rotatably pivoted on obliquely upward axes and obliquely downward axes respectively, said rollers 26,27 being in contact with the upper slope and the lower slope respectively of the external periphery of said rotary table 25. Moreover, on said rotary table 25 is concentrically secured a large-diameter gear 28, said gear 28 being engaged with a gear 30 driven by the output axis of an oil motor 29 secured to the casing 11. The rotary table 25 thereby being rotatable clockwise and counterclockwise according to the clockwise and counterclockwise rotation of said oil motor 29.

In-the center of said rotary table 25 is formed an aperture 31. A pair of bearings 32 are secured and are lo cated on either side of said aperture 31. A shaft 34 which protrudes from both sides of a rotary member 33 is rotatably journaled in said bearings 32. The underside of the rotary member 33 faces the inside of the aperture 31,. the lower end of a cylindrical member 35 which penetrates through the center of the rotary mem' ber 33 and is integrally combined therewith being so adapted as to protrude into the furnace 11 through the inside of the aperture 23.

On said rotary table 25 is provided an arm 36 as shown in the drawing, a hydraulic or air cylinder 37 being pivotally mounted thereon by means of an axis 38, the front end of a piston rod 39 protruded from said cylinder 37 being rotatably connected to a part of said rotary member 33 by means of an axis 40, thereby, beingable to rotate said rotary member 33 in accordance with the reciprocation of the piston rod 39. To the upper end of the cylindrical member 35 is secured a hydraulic or air cylinder 41, a piston rod 42 of said cylinder 41 being protruded downwardly in relation to said cylinder 41. A sliding member 43 is fitted to the inside of the cylindrical member 35 so as to be slidable upwardly and downwardly in contact with the inside of said cylindrical member 35. The upper end of an elevatable movable cylinder 44 the external periphery of which is brought into contact with the inside of said cylindrical member 35 is securedto the external periphery of the sliding member 43. I

Said movable cylinder 44 extends nearly to the bottom of the furnace 11, the outside thereof being surrounded with water-cooling jacket 45, cooling water being circulated in said jacket 45 through flexible tubes 46,47 provided on said jacket for cooling water circulation, thereby preventing the heat of the furnace from being transmitted to the inside of the movable cylinder 44.

Furthermore, a supporting frame 48 is secured to the lower end of said water-cooling jacket 45, a number of collecting claws 50 being erected downwardly on the underside of said supporting frame 48.

A hydraulic or air cylinder 51 is secured to the center of the lower part of the aforementioned sliding member 43 and an impact hammer operatable by compressed air is secured to the lower end of a piston rod 52 protraded downwardly from said cylinder 51. From the lower end of the hammer 53 protrudes a chisel 54, the lower part thereof protruding from an aperture 55 in the center of the bottom 49 of said water-cooling jacket 45. The lower end of the chisel 54 protrudes farther downwardly than the collecting claws in the lower part of the supporting frame 48 when the impact hammer 53 is lowered by the piston rod 52 of the cylinder 51.

r The chisel 54 retracts farther inwardly than the collecting claws 50 when the impact hammer 53 is raised by the piston rod 52.

Said impact hammer 53 comprises an elevatable chisel 54 fitted to the lower end of a cylinder vertically reciprocatable by the action of compressed air, it being so adapted that any body pressed by the lower end of the chisel is crushed when the upper end of said chisel 54 is hit by the lower end of a piston which is elevatable by the action of compressed air.

Moreover, hearth material 56, such as macadam and the like, is spread over the bottom of the furnace 11, a discharge port 57 being formed in said bottom.

The casing 13 is moves aside while the furnace 11 is in use, and is moved so as to be located on the required part of the hearth material 56 when it becomes necessary to remove slag or the like deposited in a considerable amount on the hearth material 56 after the furnace is used for a predetermined period of time.

Then, the cylindrical member 35 and movable cylinder 44 are placed perpendicularly by rotating the rotary member 33 making use of the cylinder 37, the chisel 55 being protruded from among the collecting claws 50 by lowering the impact hammer 53 making use of the cylinder 51, said chisel 54 being pressed against the slag deposited on the hearth material 56. In this state, if compressed air is supplied to the impact hammer 53, the piston thereinside vertically oscillates vigorously, thereby hitting the upper end of the chisel 54, with the result that not only the slag is crushed but the hearth material 56 is also broken up. The collecting claws 50 must be separated from the hearth material 56 during this process.

Since the chisel 54 can be turned in any required direction by appropriately rotating the rotary member 33 and the rotary table 25 making use of the cylinder and the oil motor 29, and then by moving the frame member 13 by means of the oil motor 17, this equipment makes it possible to completely crush the slag deposited not only on the entire area of the bottom of the furnace 11 but also in all the corners and on the internal periphery of the lower part of the furnace 11.

After the slag has been crushed, the chisel 54 is retracted from among the collecting claws 50 by withdrawing the impact hammer 53 making use of the cylinder 51, the sliding member 43 and the movable cylinder 44 being lowered by operating the cylinder 41, thereby inserting the collecting claws 50 into the crushed slag. The crushed slag and the hearth material are collected and discharged through the discharge port 57 making use of the collecting claws 50 operated by the cylinder 37 and the oil motors 17 and 29 as described hereinbefore.

After the slag and the used hearth material have been discharged through the discharge port 57, fresh hearth material 56 is spread over the hearth of the furnace 11 and the discharge port 57 is closed for the resumption of the operation.

As described hereinbefore, the slag removing equipment according to this invention comprises a cylindrical member rotatably and inclinably mounted on a casing which is movablealong the furnace, said cylindrical member being so adapted as to be operable by means of an oil motor and a hydraulic or air cylinder. The cylindrical member is further provided with an impact hammer and collecting claws elevatable by a hydraulic or air cylinder, thereby making it possible to crush and collect the slag with remarkably improved efficiency without the necessity of workers entering the inside of the furnace. Moreover, since the lower part of the casing is provided with a heat resisting member and the impact hammer and the like are enclosed with a watercooling jacket, the crushing operation can be conducted without any hindrance even when the temperature is still very high inside the furnace, with the result that the loss of time entailed from waiting until the furnace is cooled can be avoided.

What I claimed is:

1. Slag removing apparatus for removing slag from a high temperature furnace, said apparatus comprising a power-driven casing mounted to be capable of travelling along the top of said furnace and a heat resisting member covering the underside thereof, a powerdriven rotary table rotatably mounted on said casing and being rotatable in a horizontal plane, a vertical cylindrical member mounted on said rotary table and power drive means for pivoting said cylindrical member about a horizontal axis, an inner cylindrical member having its upper portion slidably fitted in said vertical cylindrical member and first piston means mounted on said vertical cylindrical member for elevating and lowering said inner cylinder, collecting claws provided at the lower end of said inner cylindrical member, an impact hammer vertically movable within said inner cylinder and having a chisel at the lower end thereof, second piston means mounted in said inner cylinder for moving said impact hammer up and down, said second piston means causing said chisel to be projected from or retreated into the lower end of said collecting claws, and a water-cooling jacket enclosing the outside of said inner cylindrical member for cooling the same.

t i I I 4

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1347332 *Aug 6, 1917Jul 20, 1920 hopkinson
US3171736 *Feb 13, 1961Mar 2, 1965United States Steel CorpMethod and apparatus for handling slag
US3471888 *Jan 3, 1966Oct 14, 1969Grant Inc Louis ASoaking pit chipper
US3550177 *Aug 15, 1968Dec 29, 1970Ppg Industries IncApparatus for removing metal oxide scale from a reactor wall
DE1195786B *Jan 31, 1964Jul 1, 1965Salzgitter Huettenwerk AgVorrichtung zum Ausraeumen von Schlacke aus Tiefoefen
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4511125 *Nov 18, 1983Apr 16, 1985Bbc Brown Boveri, Inc.Ladle scraper mechanism
US6039915 *Apr 23, 1998Mar 21, 2000Missouri Valley Steel CompanyBurn table
US7560064Mar 24, 2006Jul 14, 2009Owen Industries, Inc.Downdraft exhaust cutting table
US7985369Mar 14, 2008Jul 26, 2011Owen Industries, Inc.Downdraft exhaust cutting and shuttle table mechanism
US7998398Feb 2, 2010Aug 16, 2011Owen Industries, Inc.Slag removal system for a burn table
US8506291Mar 31, 2010Aug 13, 2013Donald B. GibsonModular mobile furnace train
DE3442091A1 *Nov 17, 1984May 30, 1985Bbc Brown Boveri & CieAbkratzvorrichtung fuer die beseitigung von ablagerungen bei tiegeloefen
EP0451045A1 *Apr 2, 1991Oct 9, 1991Regie Nationale Des Usines Renault S.A.Installation for removing of slag
WO2010117870A1 *Apr 1, 2010Oct 14, 2010Donald GibsonModular mobile furnace train
Classifications
U.S. Classification15/104.96, 266/135
International ClassificationF27D3/00, F27D3/15
Cooperative ClassificationF27D3/1545
European ClassificationF27D3/15B