US3877621A - Sliding plug for a molten metal container - Google Patents

Sliding plug for a molten metal container Download PDF

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Publication number
US3877621A
US3877621A US407081A US40708173A US3877621A US 3877621 A US3877621 A US 3877621A US 407081 A US407081 A US 407081A US 40708173 A US40708173 A US 40708173A US 3877621 A US3877621 A US 3877621A
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US
United States
Prior art keywords
refractory
ladle
sliding plug
guide
sealing body
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
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US407081A
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English (en)
Inventor
Rolf Seybold
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Individual
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Individual
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Filing date
Publication date
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Publication of US3877621A publication Critical patent/US3877621A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures

Definitions

  • the invention relates to a sliding plug for casting ladles or for similar vessels. from which molten metals. particularly steel. are discharged through a bottom oritice. comprising a guide which is fitted on the base of the ladle from the outside. and a refractory sliding part which is capable of moving relative to the guide between a position closing the bottom orifice and one which opens it.
  • the objective ofthe invention is the design of a sliding plug of the type described above. such that on the one hand it has the advantages of the controllability of a plug operated with a stopper rod. and on the other hand. it has the accessibility of a sliding plug which is operable from the outside.
  • the sliding part is connected to the refractory sealing cone or a corresponding sealing body. particularly of rotationally symmetrical shape. and that it is movable in a vertical direction. where the sealing cone in the lowered closing position. abuts with its peripheral surface on a compltr mentary surface or matching edge. and in its raised opening position. permits the flow of metal into a clos ing chamber formed by the guide or sliding part. the cross-section of this closing chamber normally being greater than the flow cross-section adjustable by the seal. and from which the metal is discharged through a bottom orifice.
  • a sliding plug designed in this manner has the advantage that it can be controlled within wide limits. for which purpose its sliding part is moved vertically. Dur ing this. the bottom orifice is not subjected to the full static pressure of the molten metal in the casting ladle or similar vessel. but only to the static pressure of the metal in the closing chamber. The closing chamber drains completely after closure ofthe bottom orifice. as sufficient space can be left for air to enter. between the said chamber and the guide. In this area. an annular gap is produced. which has the additional advantage that if the sealing cone should be damaged and allow too much molten metal to be discharged. this molten metal would solidify in the annular gap. and block the hole. For the controllability it is particularly advantageous that not only is a short adjusting path sufficient.
  • the complementary surface of the bottom orifice matching the peripheral surface ofthe sealing cone advantageously has the shape of an annular block. which is inserted into the bottom orifice which corresponds to its dimensions. and is held in place by a plate supporting it. fixed on the bottom of the ladle.
  • the invention provides design forms which differ from one another depending on whether the closing chamber is made from the guide or the sliding part.
  • the closing chamber being formed from the sliding part.
  • an open pipe section which extends downwards from the bottom the ladle acts as a guide.
  • the sliding part which contains the closing chamber. is adjustable with lateral play.
  • the lateral play here produces the annular gap through which the air can cnter.
  • a protective gas can also be fed in at this point.
  • the said guide is conveniently made up or a refractory-lined cylinder containing the closing chamber. where this cylinder is linked with the base of the ladle and is completely enclosed with the exception of the bottom outlet andof an inner pipe sleeve extending vertically upwards.
  • the sliding part is here capable of sliding with lateral play within the pipe sleeve. and is designed as a block carrying the sealing cone. and covering the pipe sleeve with an annular collar. Both the pipe sleeve and the collar are provided with an outer or inner flange such that both flanges. in an upper limiting position of the sealing cone. are in sealing contact with one another i.e.. create a seal.
  • the sliding part is provided with a supporting member extending along the axis ofthe bottom orifice. the said extension making vertical movement of the sliding part possible.
  • the high accuracy of dosing which can be achieved with the new sliding plug. allows the sliding part to be included as a controlling member in a control circuit.
  • the sliding part can be supported by a spring which is adjustable to different forces, such that the spring tries to press the sliding part upwards. but is prevented from doing so by the higher or lower level to which the closing chamber is filled. so that a state of equilibrium results, depending on the adjustment of the spring.
  • the flow rate can easily be maintained at a predetermined. adjust-able nominal value
  • FIG. 1 shows a cross-section of the new sliding plug.
  • FIG. 2 shows an elevation. partially in section. corresponding to FIG. i.
  • FIG. 3 shows a cross-section through a modified design form of the invention.
  • FIG. I shows first of all a partial illustration of the bottom. marked 1. of a casting ladle or similar vessel.
  • the vessel has been lined in the conventional manner. with refractory brickwork.
  • the bottom orifice 2 can be seen.
  • the surround 3 of which. is made of refractory brickwork with a particularly high degree of resistance.
  • sealing cone 5 and annular block 4 were inserted from underneath. and plate 6. together with the pipe section 7 serving as guide. were screwed on in such a manner that plate 6 holds annular block 4 in position.
  • the sealing cone 5 is designed with an anchoring facility 8. the upper end of which. as can he seen from FIG. I. expands. while the lower end is threaded.
  • the sliding part 9. with closing chamber 10. is movable inside pipe sleeve 7.
  • the closing chamber has an annular shape. and is arranged in the refractory in sert ll of sliding part 9.
  • the lower section of anchoring 8 passes through sliding part 9. and is held on the base of the sliding part by means of nut 12. In this manner the sealing cone 5 is linked with sliding part 9.
  • bottom orifice [3 can be seen. again made from a special refractory insert 14. which expands conically upwards. and is inserted into the conical mantle tube 15.
  • the annular gap between pipe section 7 and sliding part 9 makes possible not only completely unimpeded vertical movement of the sliding part. but also permits the entry of air. so that the closing chamber 10 can be drained completely.
  • the molten metal can solidify in the said annular gap. so that the sliding part 9 is then blocked. and all the molten metal can be discharged correctly through the bottom orifice 13.
  • a cam l6 presses against the end of the anchoring 8. this cam being located on the actuating shaft 17.
  • FIG. 2 in addition. illustrates lateral telescopic guides l9 and 20.
  • the sliding part 9 can also be moved by other actuators. such as for example. hydraulic. pneumatic or electromechanical drives. This is particularly relevant if the sliding part 9 is to be designed as controlling element in a control circuit. or is to be controlled in relation to. for instance. the level of molten metal in the casting ladle or in a mould.
  • FIG. 3 again illustrates the sealing cone 5 inserted in an annular block 4.
  • the sliding part is designed as block 24 which carries the sealing cone 5. and has an annular collar 26.
  • a cylinder 21 is connected to the ladle bottom. which is closed save for bottom orifice [3 at the base. and for an inner pipe sleeve 25 extending upwards.
  • This cylinder 21 forms the closing chamber 10. which is also ringshaped.
  • the pipe section 25 forms the guide for the sliding part.
  • the latter can be pressurised at its lower end by means which are not shown in this illustraton. in such a manner that adjustment of height is possible. by which the sealing cone 5 is either raised or lowered. and thus allows the desired quantity of molten metal to be discharged into the closing chamber 10.
  • Pipe section 25 can have an additional upper outer flange 22. while col lar 26 of the sliding part can have a lower inner llange 23. so that the two flanges come into sealing contact with one another when the sealing cone 5 is in the upper limiting position.
  • the sliding part which is made of refractory material. is forced upwards by the buoyancy forces. so that the closing chamber fills up completely. without the metal being able to flow out of any opening other than the bottom orifice 13.
  • the closing chamber has a cross-section which is normally greater than the flow cross-section which is adjustable with the sealing cone. is to be interpreted such that it may even be possible in exceptional cases. to create a flow cross-section which can exceed that of the closing chamber. by means of operating the sliding part into the extreme position.
  • a plug for a casting ladle having a surface defining a bottom orifice.
  • said plug comprising a guide which is mounted on the exterior of the base of the ladle.
  • a refractory part which is movably mounted on the ladle for movement relative to the guide between a first position closing said bottom orifice and a second position opening said bottom orifice.
  • a refractory sealing body said refractory part being connected to said refractory sealing body and being movable in a substantially verti cal direction.
  • said sealing body being arranged so that in the first closing position its peripheral surface sealingly engages said surface on the ladle defining said bottom orifice and in the second opening position it permits the flow of metal through said bottom orifice. and a closing chamber formed in said plug.
  • the crosssection of said closing chamber being greater than the cross-section of said bottom orifice.
  • said closing chamber having an exit orifice in the bottom portion thereof which is laterally offset from said bottom orifice.
  • a sliding plug in accordance with claim 3. wherein an additional guide is provided to enable movement of the refractory part without substantial variation of said gap.
  • said sliding part is a refractory block having its lower portion movably disposed within the pipe sleeve. said block carrying the sealing body and having an annular collar enclosing the upper portion of the pipe sleeve.
  • a sliding plug according to claim 5 wherein the lower portion of said block is spaced from said pipe sleeve to provide a small gap lherebetween so that the closing chamber is in communication with the surrounding atmosphere through said gap.
  • a sliding plug according to claim I wherein the refractory sealing body is of rotationally symmetrical shape.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Furnace Charging Or Discharging (AREA)
US407081A 1972-10-20 1973-10-17 Sliding plug for a molten metal container Expired - Lifetime US3877621A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2251484A DE2251484B2 (de) 1972-10-20 1972-10-20 Verschlußschieber

Publications (1)

Publication Number Publication Date
US3877621A true US3877621A (en) 1975-04-15

Family

ID=5859582

Family Applications (1)

Application Number Title Priority Date Filing Date
US407081A Expired - Lifetime US3877621A (en) 1972-10-20 1973-10-17 Sliding plug for a molten metal container

Country Status (4)

Country Link
US (1) US3877621A (enExample)
JP (1) JPS4974126A (enExample)
DE (1) DE2251484B2 (enExample)
SU (1) SU495808A3 (enExample)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863189A (en) * 1958-02-03 1958-12-09 Harold S Beck Ladle nozzle construction
US3354939A (en) * 1964-07-17 1967-11-28 Calderon Automation Inc Apparatus for handling molten metal
US3574341A (en) * 1967-12-30 1971-04-13 Didier Werke Ag Valve closure for ladles and the like

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863189A (en) * 1958-02-03 1958-12-09 Harold S Beck Ladle nozzle construction
US3354939A (en) * 1964-07-17 1967-11-28 Calderon Automation Inc Apparatus for handling molten metal
US3574341A (en) * 1967-12-30 1971-04-13 Didier Werke Ag Valve closure for ladles and the like

Also Published As

Publication number Publication date
DE2251484B2 (de) 1975-11-20
JPS4974126A (enExample) 1974-07-17
SU495808A3 (ru) 1975-12-15
DE2251484A1 (de) 1974-04-25

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