US3848861A - Dust shield for use with a motion transmitting rod - Google Patents

Dust shield for use with a motion transmitting rod Download PDF

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Publication number
US3848861A
US3848861A US00291409A US29140972A US3848861A US 3848861 A US3848861 A US 3848861A US 00291409 A US00291409 A US 00291409A US 29140972 A US29140972 A US 29140972A US 3848861 A US3848861 A US 3848861A
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US
United States
Prior art keywords
slide
shield
motion rod
plate
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00291409A
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English (en)
Inventor
S Rumping
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gutehoffnungshutte Sterkrade AG
Original Assignee
Gutehoffnungshutte Sterkrade AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19712147123 external-priority patent/DE2147123C3/de
Application filed by Gutehoffnungshutte Sterkrade AG filed Critical Gutehoffnungshutte Sterkrade AG
Application granted granted Critical
Publication of US3848861A publication Critical patent/US3848861A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/08—Top armourings

Definitions

  • ABSTRACT A device for adjustably positioning a structural element in a dust-laden environment, such as for positioning impact casing elements in a metallurgical blast furnace, consists of a motion rod connected between a drive member and the elements to be positioned and a shield through which the motion rod extends, the shield is constructed of plates which form a slot and of a slide movably positioned in the slot and having a bore through which the motion rod extends.
  • the slide covers an opening through the plates and forms a closure against the passage of dust into the drive member.
  • the bore surface through the slide is shaped to afford not only longitudinal movement of the motion rod but also limited pivotal movement and, in addition, the slide affords transverse movement.
  • the present invention is directed to a device used for adjusting a structural element in a dust-laden environment, and, more particularly, it is directed to a shield for a motion rod which prevents passage of dust from the environment containing the structural elements to the drive member for the motion rod.
  • a structural element such as the impact casing elements used in a metallurgical blast furnace
  • a motion rod is provided between the structural elements and a drive member to afford not only longitudinal movement of the motion rod but also a limited pivotal and/or transverse movement in at least one direction.
  • the present invention is concerned with the provision of a dust shield for the motion rod for limiting the passage of dust along the motion rod toward its drive member.
  • the dust shield consists of a plate type slide having a bore through which the motion rod extends and with the surface of the bore providing the least possible clearance about the motion rod.
  • the slide is displaceably guided within a slot formed by two fixed plates which are spaced apart by the thickness of the slide. At least one of the fixed plates forms a partial closure of the passage between the impact casing element and the drive member. The remaining opening through the dust shield is closed in every possible position of the motion rod by the slide.
  • the longitudinal movement and slight pivotal movement of the motion bar is made possible by the arrangement'of the bore through the slide, the surface of the bore being shaped to provide such a small clearance about the motion rod that almost a complete barrier is provided against the penetration of dust in the direction of the drive member.
  • the transverse movement of the motion rod is made possible by the sliding movement of the slide in the slot provided by the fixed plates of the shield.
  • the slot formed by the plates also provides a barrier against the penetration of dust in the direction of the drive member.
  • the opening or bore in the slot should have a greater dimension'than the transverse dimension of the motion rod.
  • the opening through the slide can be retained at a minimal amount if the surface of the bore has a suitable form.
  • the preferred configuration of the surface forming the bore would theoretically consist of two serially arranged frusto-conical surfaces with the half apex angle corresponding to the maximum deflection of the motion rod.'ln practice it has been found, however, that it is preferable if the surface of the bore extending inwardly from the faces of the slide are frusto-conically shaped and converge inwardly toward one another in the direction of the bore axis and, further,
  • the slide at the point of the least dimension of the bore its surface between the frusto-conically shaped surfaces has a radius of curvature which is less than 20% of the motion rod diameter.
  • the slide could have a circular periphery, but since one of the movements of the motion rod in the transverse direction will be considerably greater than its movement in the other transverse direction, it has proved advantageous to provide the slide with a mainly rectangular form and to fit it into two slots formed by the fixed plates of the shield and extending along the two longer sides of the rectangularly shaped slide.
  • the slots can be straight so that a simple construction is obtained.
  • the present invention includes means, located on the drive member side of the shield, for maintaining a gas overpressure relative to the furnace side of the shield. Because of the small transverse dimensions of the slotted openings, it is possible to maintain a sufficiently high gas velocity at a very small gas overpressure through the slotted openings counter to the normal direction of passage of the dust, for maintaining the slotted openings entirely free of dust. If the invention is used with a blast furnace, an overpressure on the drive member side of the shield can be successfully maintained with purified blast furnace gas or natural gas. Accordingly, any gas which leaks through the shield into the blast furnace then corresponds, in composition, to the gas atmosphere within the blast furnace or even enrichs it.
  • the drive member for the motion rod is located within a hood which, in turn, is secured to the blast furnace shell and the shield for the motion rod is secured within the hood.
  • a preferred arrangement consists of a hollow beam secured to the blast furnace shell and extending into its refractory furnace lining with the shield forming an end face of the hollow beam outwardly from the furnace shell.
  • a hood encloses the drive member and extends inwardly to and at least a portion of the hood is detachably secured either directly or indirectly to the shell of the blast furnace.
  • the hollow beam can provide a support for the refractory material lining the furnace shell. Because the hood enclosing the drive member is partially detachable, the condition of the dust shield can be checked periodically without affecting the operation of the furnace. Additionally, any small amounts of dust which have penetrated through the shield can be removed in a simple manner.
  • Another preferred feature of the shield arrangement is the construction of the slide from two plate-like members each having a U-shaped recess along one side. This arrangement facilitates the assembly and disassembly of the slide. With this construction, the two parts of the slide can be arranged about the motion rod after it is installed and then can be firmly connected together. Naturally, the slide constructed of two parts should be sufficiently flat for easy movement in the slots within the shield without forming any larger openings.
  • FIG. 1 is a more or less schematic vertical sectional view of a portion of an adjustable impact casing in a blast furnace embodying the present invention
  • FIG. 2a is an enlarged detail view of the encircled portion of FIG. I designated II;
  • FIG. 2b is a sectional view of a portion of FIG. 2a indicating a different arrangement due to a different position of the impact casing;
  • FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 20;
  • FIG. 4 is a view, partly in section, taken along the line IVIV in FIG. 2b;
  • FIG. 5a is an enlarged view of a portion of the ar- DETAILED DESCRIPTION OF THE INVENTION
  • the steel shell 1 of a blast furnace is shown coated with a refractory lining 2.
  • the portion of the blast furnace shell shown in the drawing is located in the vicinity of the lower filling bell 3 which, as indicated by the arrow, can be moved vertically in the direction toward and away from the fixed seat 4.
  • the bell 3 is spaced downwardly from the fixed seat 4 forming an opening or port through whic the blast furnace charge can flow downwardly as indicated by the arrows.
  • the charge After passing through the port between the bell 3 and the fixed seat 4, the charge is directed against the cast steel impact casing segments 6 which are suspended by hooks 7 and 8 in openings in steel plate 9.
  • the segments 6 For example, in the impact casing there are twenty of the segments 6 in a ring-shaped arrangement overlapping one another on the inside or outside in the path of the charge through the port 5.
  • the steel plate 9 forms a part of a suspension construction which includes two cross-stays l0 and a pendulum bar 11. As indicated by the arrows, the pendulum bar 11 can be moved inwardly and outwardly relative to the shell 1 about a pivot, not shown, so that the shell elements or segments 6 follow a similar path of movement.
  • the head of a motion bar 14 is secured between the stays l0 and two cross-bridges 12, 13.
  • the motion bar 14 is moved back and forth in the direction of the arrow by means of a drive box 15 whereby the position of the casing segments can be set.
  • Dust from within the furnace is prevented from passing into the drive box by a shield 16 laterally arranged about the motion rod 14.
  • a shield 16 laterally arranged about the motion rod 14.
  • FIG. 2a an enlarged view of the shield 16 is shown.
  • the hollow beam 17 is spaced inwardly from the drive box 15 and is secured to the shell separately from the drive box.
  • the drive box is secured to the outer surface of the shell 1
  • the hollow beam extends into the refractory lining 2 of the furnace and forms a support for the lining.
  • the opening through the hollow beam is partly closed by a plate 18 having a centrally arranged opening 22.
  • the plate-type slide has an aperture or bore through which the motion bar 14 passes.
  • the bore in the slide 20 fits, as tightly as possible, around the motion bar 14, without impeding its movement in the longitudinal direction.
  • the surface of the bore is frusto-conical from the opposite sides of the bore inwardly toward the center, and the center surface portion of the bore does not form an apex but rather is rounded in a semicircular manner.
  • FIG. 3 which is a transverse section of the showing in FIG. 2a, it is evident that the slide 20 can be moved in a direction across the direction of movement of the motion rod shown in FIG. 2b. Accordingly, two extreme positions of the motion rod 14, 14a and of the slide 20 and 20a are shown in solid lines and broken lines respectively. These extreme positions areattained by means of a crank mechanism which is designated schematically by the povot point 21a.
  • FIG. 4 a transverse section is shown of the arrangement in FIG. 2b and it is evident that the plate-shaped slide 20 always covers the opening 22 in the plate 18 regardless of the manner in which the motion rod is moved across the opening 22 in the transverse direction. Further, the slide always remains closed in that portion in contact with the beams 19.
  • the bottom of the lower sectional beam 19 can be provided with downwardly extending openings for discharging any dust which might gradually accumulate in the slot below the slide 20.
  • the plate-shaped slide 20 is illustrated in detail.
  • the slide is made up of two parts 23, 24 which can be fastened together by screws extending through holes 26 into the tapped holes 23.
  • Each of the two parts 23, 24 have a pair of tongue-like portions 27, 28 each of which has a thickness which is half that of the thickness of the plates 23, 24.
  • the tongue-like portions 27, 28 form a U-shaped recess in the sides of the plates which face toward one another.
  • the U-shaped recesses form a circular hole having a semi-circular rounded edge, as shown in FIG. 2a.
  • a device for adjusting the position of a structural element in a dust-laden environment including a drive member, a passageway extending from said drive member toward said structural element, an axially elongated motion rod extending through said passageway between said drive member and said structural element, said motion rod being capable of effecting the combination of longitudinal movement and limited pivotal movement and/or transverse movement in at least one direction, means for preventing the passage of dust along said motion rod toward said drive member, wherein the improvement comprises that said means for preventing the passage of dust includes a shield having an opening therethrough, said shield extending transversely of said motion rod and across said passageway so that flow through said passageway is limited to the opening through said shield, a plate-shaped slide movably displacebly mounted in said shield and extending transversely of said motion rod, said slide closing the opening through said shield, said slide having a bore therethrough so that said motion rod extends through the bore, the bore in said motion rod shaped to conform to
  • said shield comprises a plate means arranged to form a slot therebetween extending transversely of the axis of the said motion rod, and said slide being movably displaceable through said slot.
  • said plate means comprises a first plate forming the opening closed by said slide, and at least one second plate fixed to said first plate with portions of said first and second plates spaced apart by a dimension equal to the thickness of said slide and forming said slot for said slide therebetween.
  • a device as set forth in claim 1, wherein the surface of the bore through said slide has an axially extending frusto-conically shaped portion extending from each of the opposite faces of said slide so that the surfaces converge toward one another inwardly toward the center portion of the bore, and a rounded portion of said bore surface interconnecting the frustoconically shaped portions.
  • a device as set forth in claim 4, wherein the rounded portion of said bore between the frustoconically shaped portions thereof has a radius of curvature which is less than 20 percent of said motion rod diameter.
  • a device as set forth in claim 3, wherein said slide having a generally rectangular form in the plane transverse to the axis of said motion rod and two of the sides of said slide being arranged in a sliding fit in said slot formed by said first and second plates.
  • said slide comprises a pair of plate-like members each having a U-shaped recess in one side thereof, and means for removably securing said plate-like members together so that the U-shaped recesses combine to form the bore through said slide.
  • each of said plate-like members of said slide has a pair of said tongue-like portions.
  • a device as set forth in claim 1, wherein means are provided for maintaining a gas over-pressure within said passageway on the side of said shield closer to said drive member.
  • a device as set forth in claim 1, wherein said structural elements are adjustable impact casing members for a metallurgical furnace and at least a number of said impact casing members being connected each to a different said motion bar.
  • a device as set forth in claim 10, wherein a refractory lining for the metallurgical furnace, said passageway extending between said drive member comprising a hollow beam enclosing said shield at one end thereof and extending inwardly therefrom into said refractory lining, and an at least partially detachable hood member laterally enclosing the end of said hollow beam and shield and extending inwardly therefrom to the outer surface of the metallurgical furnace, said hood member enclosing said drive member.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Sliding Valves (AREA)
US00291409A 1971-09-21 1972-09-22 Dust shield for use with a motion transmitting rod Expired - Lifetime US3848861A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712147123 DE2147123C3 (de) 1971-09-21 Verstellvorrichtung fur Schlagpanzerelemente eines Hochofens

Publications (1)

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US3848861A true US3848861A (en) 1974-11-19

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US00291409A Expired - Lifetime US3848861A (en) 1971-09-21 1972-09-22 Dust shield for use with a motion transmitting rod

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US (1) US3848861A (cs)
JP (3) JPS4838809A (cs)
BE (1) BE789063A (cs)
CS (1) CS180604B2 (cs)
FR (1) FR2157801B1 (cs)
GB (1) GB1368020A (cs)
IT (1) IT967425B (cs)
LU (1) LU66117A1 (cs)
NL (1) NL7212408A (cs)
SU (1) SU452966A3 (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080097135A1 (en) * 2006-10-18 2008-04-24 Alcoa Inc. Electrode containers and associated methods

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54131510A (en) * 1978-04-04 1979-10-12 Nippon Kokan Kk <Nkk> Charge distributer in blast furnace
JPS5641304A (en) * 1979-09-14 1981-04-18 Kawasaki Steel Corp Operating method for movable armor in blast furnace

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009691A (en) * 1958-12-18 1961-11-21 Yawata Iron & Steel Co Protecting apron for charge at blast furnace top

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985473A (en) * 1957-11-19 1961-05-23 Alan I Parker Floating seal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009691A (en) * 1958-12-18 1961-11-21 Yawata Iron & Steel Co Protecting apron for charge at blast furnace top

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080097135A1 (en) * 2006-10-18 2008-04-24 Alcoa Inc. Electrode containers and associated methods
US8252156B2 (en) * 2006-10-18 2012-08-28 Alcoa Inc. Electrode containers and associated methods

Also Published As

Publication number Publication date
FR2157801B1 (cs) 1977-01-14
LU66117A1 (cs) 1973-01-17
IT967425B (it) 1974-02-28
SU452966A3 (ru) 1974-12-05
JPS5546700U (cs) 1980-03-27
JPS4838809A (cs) 1973-06-07
DE2147123A1 (de) 1973-03-29
JPS5166203A (cs) 1976-06-08
GB1368020A (en) 1974-09-25
NL7212408A (cs) 1973-03-23
DE2147123B2 (de) 1977-01-27
BE789063A (fr) 1973-01-15
CS180604B2 (en) 1978-01-31
FR2157801A1 (cs) 1973-06-08

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