US3220574A - Door banking apparatus - Google Patents

Door banking apparatus Download PDF

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US3220574A
US3220574A US367163A US36716364A US3220574A US 3220574 A US3220574 A US 3220574A US 367163 A US367163 A US 367163A US 36716364 A US36716364 A US 36716364A US 3220574 A US3220574 A US 3220574A
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door
body portion
banker
furnace
banking
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US367163A
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Joseph T Sefcheck
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Bethlehem Steel Corp
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Bethlehem Steel Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/167—Introducing a fluid jet or current into the charge the fluid being a neutral gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1545—Equipment for removing or retaining slag
    • F27D3/159—Equipment for removing or retaining slag for retaining slag during the pouring of the metal or retaining metal during the pouring of the slag

Definitions

  • This invention relates to apparatus for banking the doors of a metallurgical furnace with refractory material, particularly the doors of an open hearth furnace.
  • the usual practice of banking doors involves the utilization of a dolomite throwing machine.
  • the throwing machine is moved by an overhead crane and positioned to project refractory material to the desired located on the top of a door sill plate.
  • a bafile is used to assist the placement of material.
  • the bafile is normally positioned at the end of a long handle which is pivoted upon the frame of the dolomite machine and manipulated by a furnace helper standing alongside the machine.
  • the banking must be completed by manually placing a few shovels full of refractory on the sills, particularly at the corners of the door frame.
  • a fast hot metal charge reduces the heat time, particularly in oxygen furnaces where the lances can not be lowered into the bath until after the hot metal is in the furnace.
  • Another object is to provide mechanical means which will eliminate the requirement for any hand shoveling of refractory material to bank the doors of metallurgical furnaces.
  • Another object is to eliminate any reliance upon the floor cranes of an open hearth shop for assistance in banking furnace doors.
  • Another object is to provide a door banking unit that may be detachably mounted on the peel of a furnace charging machine to facilitate handling.
  • the present invention relates to a cylindrical-shaped container that is designed to be used to bank furnace doors in conjunction with the usual open hearth furnace charging machine.
  • a screw assembly fixed within the container causes aggregate material to be fed from the discharge end of the unit when the container is rotated about its longitudinal axis by the manipulation of a charging machine peel upon which it is mounted.
  • FIGURE 1 is a top plan view of the door banker.
  • FIGURE 2 is a longitudinal section of the shell of the banker on line 22 of FIGURE 1 and having the interior of the banker in elevation to illustrate the internal construtcion.
  • FIGURE 3 is a cross-sectional view of the banker on line 33 of FIGURE 2.
  • FIGURE 4 is a View illustrating the door banker mounted upon the peel of a charging machine and positioned to discharge material onto a furnace door sill.
  • FIGURE 5 is a partial cross-sectional view of the upper half of the shell of the banker on line 5-5 of FIGURE 2.
  • the present invention comprises a door banker 16 having a cylindrical body portion 11 with a back end 12 and a forward end 13.
  • Plate 14 is fixed to the body portion 11 in any suitable manner and closes its back end 12.
  • Plate 14 is provided with a standard charging box head 17 for operatively engaging the peel of a charging machine.
  • Duplex screw assembly 18 extends through door banker 10 and is fixed therein in any suitable manner, as by welding.
  • Shaft 19 of screw assembly 18 has a straight portion 20 within body portion 11, and a tapered forward portion 21 within conical portion 15 of banker 1t).
  • Tap ered forward portion 21 of shaft 19 has a back end 22 and a forward end 23.
  • Helical blade section 24 of screw assembly 13 extends through and is joined to the inside surface of body portion 11.
  • Helical blade section 24 has a back edge 25 and a forward edge 26 and is mounted upon straight portion 20 of shaft 19.
  • Tapered screw or spiral blade section 27 of screw assembly 18 extends through and is joined to the inside surface of conical portion 15 and decreases in diameter and pitch at it approaches discharge opening 16.
  • spiral blade section 27 is made with two spirals 28 and 29 separated by 180, as shown in FIGURE 3, to provide a more uniform rate of discharge of aggregate from the banker than can be achieved with only a single spiral.
  • Spiral blade section 27 is mounted on tapered forward portion 21 of shaft 19 and begins at back end 22 thereof, at point 30, for spiral 2S, and at point 31, for spiral 29.
  • FIGURE 3 shows in detail the exact location of beginning point 30 of spiral 28 with respect to forward edge 26 of helical blade section 24.
  • Point 36 which lies in approximately the same transverse plane of banker 10 as does forward edge 26 of helical blade setcion 24, is separated from edge 26 and leads it in the same transverse plane by an angle of approximately
  • body portion 11 is provided with a longitudinally extending load-receiving opening 32.
  • Doors 33 pivotally connected by means of hinges 34- to body portion 11 extend across opening 32 and are locked in the closed position by latches 35 when the door banker is filled with aggregate and ready for use.
  • the door banker is usually stored at some convenient location between furnaces where it is readily available for use and where it can be charged in some suitable manner, as from an overhead hopper.
  • a charging machine operator engages the peel 36 of his charging machine with the charging box head 17 of the banker 10 and carries it to the furnace.
  • a door 37 of the furnace is opened, and charging machine peel is manipulated to position the outlet opening 16 of the banker 10 just within the door opening 38.
  • the operator then rotates the charging machine peel 36 causing banker 10 to rotate and discharge refractory aggregate material from its discharge opening 16.
  • the charging machine operator also moves his machine slowly along its tracks whereby banker 10 moves across the furnace opening and discharges refractory aggregate 39 uniformly along the sill plate 40. Banker 10 is then withdrawn from door opening 38, carried to the next door and the operation repeated in similar fashion until all the doors of the furnace have been banked.
  • door banker 10 was designed with a capacity of approximately thirty (30) cu. ft. which was adequate to bank five (5) doors of a 180 ton open hearth furnace with granular dolomite.
  • Helical blade section 24 had a pitch of 2'0" and tapered blade section 27 was formed with two spirals, 180 apart, which made 1 /2 turns within conical portion 15.
  • a door banking device adapted to be rotated about its longitudinal axis whereby aggregate material contained therein is discharged therefrom when operatively engaged by a metallurgical furnace charging machine peel, said device comprising (a) a cylindrical body portion a forward end,
  • duplex screw means within said device, said means comprising a straight helical screw section and a varying pitch tapered screw section, and
  • a door banking device adapted to be rotated about its longitudinal axis whereby aggregate material contained therein is discharged therefrom when operatively engaged by a metallurgical furnace charging machine peel, said device comprising (a) a cylindrical body a forward end,
  • duplex screw means within said device said means comprising a straight helical screw section within said body portion and a variable pitch tapered screw section within said truncated conical portion, and
  • a door banking device adapted to be rotated about its longitudinal axis whereby aggregate material contained therein is discharged therefrom when operatively engaged by a metallurgical furnace charging machine peel, said device comprising (a) a cylindrical body portion having a back end and a forward end,
  • a door banking device adapted to be rotated about its longitudinal axis whereby aggregate material contained therein is discharged therefrom when operatively engaged by a metallurgical furnace charging machine peel, said device comprising (a) a cylindrical body portion having a back end and a forward end,
  • duplex screw means within said device comprising a shaft having a straight portion and a forward tapered portion, said tapered forward portion having a back end and a forward end, a helical blade section mounted upon the straight portion of said shaft and having a back edge and a forward edge, and a varying pitch tapered blade section mounted upon the forward tapered portion of said shaft, said tapered blade section beginning at said back end of forward tapered portion at a point which lies in approximately the same transverse plane of said banker as does said forward edge of said helical blade section and is separated therefrom and leads it in the same transverse plane by an angle of approximately and (g) a load receiving opening extending longitudinally of said body portion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture Of Iron (AREA)

Description

Nov. 30, 1965 J. T. SEFCHECK DOOR BANKING APPARATUS 2 Sheets-Sheet 1 Filed May 13, 1964 H [II INVENTOR. Joseph 7. Sefchec/r NOV. 1965 .1. T. SEFCHECK DOOR BANKING APPARATUS 2 Sheets-Sheet 2 Filed May 13, 1964 INVENTOR.
Joseph T. Sefchec/r United States Patent 3,220,574 DGOR BANKING APPARATUS Joseph T. Sefcheck, Johnstown, Pa, assignor, by mesne assignments, to Bethlehem Steel Corporation, a corporation of Delaware Filed May 13, 1964, Ser. No. 367,163 7 Claims. (Cl. 21431) This invention relates to apparatus for banking the doors of a metallurgical furnace with refractory material, particularly the doors of an open hearth furnace.
It is well known to those skilled in the steelmaking art to which this apparatus pertains that the doors of an open hearth furnace must be banked with a suitable refractory material, such as raw or burned dolomite, during every heat. The purpose of banking the doors is to raise the effective sill plate level of the doors in order to prevent the overflow of molten steel and to control the overflow of slag during a heat.
The usual practice of banking doors involves the utilization of a dolomite throwing machine. The throwing machine is moved by an overhead crane and positioned to project refractory material to the desired located on the top of a door sill plate. A bafile is used to assist the placement of material. The bafile is normally positioned at the end of a long handle which is pivoted upon the frame of the dolomite machine and manipulated by a furnace helper standing alongside the machine. In many instances the banking must be completed by manually placing a few shovels full of refractory on the sills, particularly at the corners of the door frame.
The above described manner of banking the doors of a metallurgical furnace has certain drawbacks. Even with a baflle, the dolomite machine and hand shoveling do not always accurately position the refractory on the sill plate, and there is a waste of material. During the period when the doors are being banked the fuel to the burners is cut back, the furnace pressure is reduced and one or more doors are open resulting in a loss of furnace heat. At times, when the doors are ready to be banked, a floor crane is not available for transporting and positioning the dolomite machine. Thus, the heat time is lengthened, because the hot metal can not be charged into the furnace until the door banking has been completed. In addition to eliminating these undesirable features of the previous method of banking doors and allows the hot metal to be charged into the furnace earlier than was previously the case. A fast hot metal charge reduces the heat time, particularly in oxygen furnaces where the lances can not be lowered into the bath until after the hot metal is in the furnace.
It is an object of the present invention to provide a device that will distribute refractory material upon the sill plate of an open hearth door frame more accurately and uniformly than will apparatus now available.
Another object is to provide mechanical means which will eliminate the requirement for any hand shoveling of refractory material to bank the doors of metallurgical furnaces.
Another object is to eliminate any reliance upon the floor cranes of an open hearth shop for assistance in banking furnace doors.
Another object is to provide a door banking unit that may be detachably mounted on the peel of a furnace charging machine to facilitate handling.
It is a still further object of the present invention to eliminate the practice of cutting back the fuel to the burners and reducing the pressure of an open hearth furnace during the time when the doors are being banked.
The present invention relates to a cylindrical-shaped container that is designed to be used to bank furnace doors in conjunction with the usual open hearth furnace charging machine. A screw assembly fixed within the container causes aggregate material to be fed from the discharge end of the unit when the container is rotated about its longitudinal axis by the manipulation of a charging machine peel upon which it is mounted.
An embodiment of an apparatus in accordance with the invention is illustrated, by way of example, in the accompanying drawings in which FIGURE 1 is a top plan view of the door banker.
FIGURE 2 is a longitudinal section of the shell of the banker on line 22 of FIGURE 1 and having the interior of the banker in elevation to illustrate the internal construtcion.
FIGURE 3 is a cross-sectional view of the banker on line 33 of FIGURE 2.
FIGURE 4 is a View illustrating the door banker mounted upon the peel of a charging machine and positioned to discharge material onto a furnace door sill.
FIGURE 5 is a partial cross-sectional view of the upper half of the shell of the banker on line 5-5 of FIGURE 2.
Referring in detail to the drawings, the present invention comprises a door banker 16 having a cylindrical body portion 11 with a back end 12 and a forward end 13. Plate 14 is fixed to the body portion 11 in any suitable manner and closes its back end 12. Connected to the forward end 13 of body portion 11, is truncated conical portion 15 at the apex of which is discharge opening 16. Plate 14 is provided with a standard charging box head 17 for operatively engaging the peel of a charging machine.
Duplex screw assembly 18 extends through door banker 10 and is fixed therein in any suitable manner, as by welding. Shaft 19 of screw assembly 18 has a straight portion 20 within body portion 11, and a tapered forward portion 21 within conical portion 15 of banker 1t). Tap ered forward portion 21 of shaft 19 has a back end 22 and a forward end 23. Helical blade section 24 of screw assembly 13 extends through and is joined to the inside surface of body portion 11. Helical blade section 24 has a back edge 25 and a forward edge 26 and is mounted upon straight portion 20 of shaft 19. Tapered screw or spiral blade section 27 of screw assembly 18 extends through and is joined to the inside surface of conical portion 15 and decreases in diameter and pitch at it approaches discharge opening 16. Preferably, spiral blade section 27 is made with two spirals 28 and 29 separated by 180, as shown in FIGURE 3, to provide a more uniform rate of discharge of aggregate from the banker than can be achieved with only a single spiral. Spiral blade section 27 is mounted on tapered forward portion 21 of shaft 19 and begins at back end 22 thereof, at point 30, for spiral 2S, and at point 31, for spiral 29.
FIGURE 3 shows in detail the exact location of beginning point 30 of spiral 28 with respect to forward edge 26 of helical blade section 24. Point 36, which lies in approximately the same transverse plane of banker 10 as does forward edge 26 of helical blade setcion 24, is separated from edge 26 and leads it in the same transverse plane by an angle of approximately In like fashion, beginning point 31 of spiral 29, which is separated from spiral 28 by also lies in approximately the same transverse plane of banker 10 as does forward edge 26 of helical blade section 24 and is separated from it but follows it in the same transverse plane by an angle of approximately 90.
To load door banker 10, body portion 11 is provided with a longitudinally extending load-receiving opening 32. Doors 33 pivotally connected by means of hinges 34- to body portion 11 extend across opening 32 and are locked in the closed position by latches 35 when the door banker is filled with aggregate and ready for use.
The door banker is usually stored at some convenient location between furnaces where it is readily available for use and where it can be charged in some suitable manner, as from an overhead hopper. When the doors of a furnace are to be banked, a charging machine operator engages the peel 36 of his charging machine with the charging box head 17 of the banker 10 and carries it to the furnace. A door 37 of the furnace is opened, and charging machine peel is manipulated to position the outlet opening 16 of the banker 10 just within the door opening 38. The operator then rotates the charging machine peel 36 causing banker 10 to rotate and discharge refractory aggregate material from its discharge opening 16. At the same time, the charging machine operator also moves his machine slowly along its tracks whereby banker 10 moves across the furnace opening and discharges refractory aggregate 39 uniformly along the sill plate 40. Banker 10 is then withdrawn from door opening 38, carried to the next door and the operation repeated in similar fashion until all the doors of the furnace have been banked.
In a specific embodiment of the invention as described, door banker 10 was designed with a capacity of approximately thirty (30) cu. ft. which was adequate to bank five (5) doors of a 180 ton open hearth furnace with granular dolomite. Helical blade section 24 had a pitch of 2'0" and tapered blade section 27 was formed with two spirals, 180 apart, which made 1 /2 turns within conical portion 15.
While one embodiment of my invention has been illustrated and described, it will be understood that there may be various embodiments within the general scope of the invention and the scope of the appended claims.
I claim:
1. A door banking device adapted to be rotated about its longitudinal axis whereby aggregate material contained therein is discharged therefrom when operatively engaged by a metallurgical furnace charging machine peel, said device comprising (a) a cylindrical body portion a forward end,
(b) plate means attached to said body portion and closing the back end thereof,
(c) head means attached to said plate means to operatively engage said charging machine peel,
(d) a truncated conical portion attached to the forward end of said body portion,
(e) a discharge opening at the apex of said conical portion,
(f) duplex screw means within said device, said means comprising a straight helical screw section and a varying pitch tapered screw section, and
(g) a load receiving opening in said body portion.
2. The door banking device of claim 1 in which the tapered screw section comprises a plurality of spirals.
3. The door banking device of claim 1 in which the tapered screw section comprises two spirals 180 apart.
4. A door banking device adapted to be rotated about its longitudinal axis whereby aggregate material contained therein is discharged therefrom when operatively engaged by a metallurgical furnace charging machine peel, said device comprising (a) a cylindrical body a forward end,
(b) plate means attached to said body portion and closing the back end thereof,
(c) head means attached to said plate means to operatively engage said charging machine peel,
(d) a truncated conical portion attached to the forward end of said body portion,
having a back end and portion having a back end and (e) a discharge opening at the apex of said conical i portion, (f) duplex screw means within said device, said means comprising a straight helical screw section within said body portion and a variable pitch tapered screw section within said truncated conical portion, and
(g) a load receiving opening in said body portion.
5. The door banking device of claim 4 in which said straight helical screw section is fixed at its outer edge to the inner surface of said body portion and said tapered screw section is fixed at its outer edge to the inner surface of said conical portions.
6. A door banking device adapted to be rotated about its longitudinal axis whereby aggregate material contained therein is discharged therefrom when operatively engaged by a metallurgical furnace charging machine peel, said device comprising (a) a cylindrical body portion having a back end and a forward end,
(b) plate means attached to said body portion and closing the back end thereof,
(c) head means attached to said plate means to operatively engage said charging machine peel,
(d) a truncated conical portion attached to the forward end of said body portion,
(e) a discharge opening at the apex of said conical portion,
(f) a helical blade section fixed at its outer edge to the inner wall of said body portion,
(g) a varying pitch tapered blade section fixed at its outer edge to the inner wall of said conical portion, and
(h) a load receiving opening extending longitudinally of said body portion.
7. A door banking device adapted to be rotated about its longitudinal axis whereby aggregate material contained therein is discharged therefrom when operatively engaged by a metallurgical furnace charging machine peel, said device comprising (a) a cylindrical body portion having a back end and a forward end,
(b) plate means attached to said body portion and closing the back end thereof,
(c) head means attached to said plate means to operatively engage said charging machine peel,
(d) a truncated conical portion attached to the forward end of said body portion,
(e) a discharge opening at the apex of said conical portion,
(f) duplex screw means within said device, said means comprising a shaft having a straight portion and a forward tapered portion, said tapered forward portion having a back end and a forward end, a helical blade section mounted upon the straight portion of said shaft and having a back edge and a forward edge, and a varying pitch tapered blade section mounted upon the forward tapered portion of said shaft, said tapered blade section beginning at said back end of forward tapered portion at a point which lies in approximately the same transverse plane of said banker as does said forward edge of said helical blade section and is separated therefrom and leads it in the same transverse plane by an angle of approximately and (g) a load receiving opening extending longitudinally of said body portion.
References Cited by the Examiner UNITED STATES PATENTS 1,329,293 1/1920 Clark 214-32 1,340,156 5/1920 Clark et al. 214-21 HUGO O. SCHULZ, Primary Examiner,
UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,220,574 November 30, 1965 Joseph T. Sefcheck It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below Column 1, line 46, after "doors" insert the invention reduces the amount of time required to bank the doors Signed and sealed this 27th day of September 1966.
(SEAL) Attest:
ERNEST W. SWIDER EDWARD J. BRENNER Attesting Officer Commissioner of Patents

Claims (1)

1. A DOOR BANKING DEVICE ADAPTED TO BE ROTATED ABOUT ITS LONGITUDINAL AXIS WHEREBY AGGREGATE MATERIAL CONTAINED THEREIN IS DISCHARGED THEREFROM WHEN OPERATIVELY ENGAGED BY A METALLURGICAL FURNACE CHARGING MACHINE PEEL, SAID DEVICE COMPRISNG (A) A CYLINDRICAL BODY PORTION HAVING A BACK END AND A FORWARD END, (B) PLATE MEANS ATTACHED TO SAID BODY PORTION AND CLOSING THE BACK END THEREOF, (C) HEAD MEANS ATTACHED TO SAID PLATE MEANS TO OPERATIVELY ENGAGE SAID CHARGING MACHINE PEEL,
US367163A 1964-05-13 1964-05-13 Door banking apparatus Expired - Lifetime US3220574A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696535A (en) * 1970-06-12 1972-10-10 Oliver C Kallio Snow displacing device with rotatable blade casing
US6000995A (en) * 1995-11-06 1999-12-14 Heinrich Schlick Unit for the dosage of grained, pourable materials, in particular blasting abrasives
US6540067B1 (en) * 2000-10-24 2003-04-01 Hoshizak America, Inc. Ice transporting assembly, ice making and transporting system and method for transporting ice

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1329293A (en) * 1918-11-23 1920-01-27 Earl W Clark Furnace-slagging apparatus
US1340156A (en) * 1917-11-15 1920-05-18 Earl W Clark Slagging-machine for furnaces

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1340156A (en) * 1917-11-15 1920-05-18 Earl W Clark Slagging-machine for furnaces
US1329293A (en) * 1918-11-23 1920-01-27 Earl W Clark Furnace-slagging apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696535A (en) * 1970-06-12 1972-10-10 Oliver C Kallio Snow displacing device with rotatable blade casing
US6000995A (en) * 1995-11-06 1999-12-14 Heinrich Schlick Unit for the dosage of grained, pourable materials, in particular blasting abrasives
US6540067B1 (en) * 2000-10-24 2003-04-01 Hoshizak America, Inc. Ice transporting assembly, ice making and transporting system and method for transporting ice

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