GB2044903A

GB2044903A - A slide closure for a casting ladle

Info

Publication number: GB2044903A
Application number: GB8003737A
Authority: GB
Original assignee: Steuler Industriewerke GmbH
Current assignee: Steuler Industriewerke GmbH
Priority date: 1979-02-07
Filing date: 1980-02-05
Publication date: 1980-10-22
Also published as: NL8000701A; LU82128A1; FR2448401A1; FR2448401B3; IT8019762A0; DE2904562A1; BE881573A; ATA59880A; IT1141186B

Abstract

A flow tube 5 set in apertured blocks 2 and 3 has a separate bottom portion 5b formed with an internal groove 9. An end plate 11 has an attachment 12 engaging in the recess formed by the groove. <IMAGE>

Description

SPECIFICATION A slide closure for casting ladles The invention relates to a slide closure for casting ladles for liquid metal, in particular steel, consisting of a flow tube which is joined to afunnel opening in the ladle bottom, stands vertically embedded in perforated blocks of the walling of the ladle lining, and widens conically toward the bottom, with a central flow channel whose lower annular end lies in the plane of the outer wall of the ladle bottom or in a plane running deeper than this, of an end plate which is detachable and is held stationarily beneath the ladle bottom and of a ceramic slide plate which extends beneath the end plate, is provided with a ceramic delivery tube, is held detachably in a slide frame and is movable and adjusted relative to the end plate, in which slide closure the lower annular end of the flow tube has a pot-shaped annular groove incision with a central opening formed by the flow channel and the end plate has an annular spring attachment which engages in this annular groove incision and whose internal lateral face is formed by the wall of the central flow channel.

Known slide closures of this type can be used only for casting ladles having a restricted capacity of up to about 150 tonnes since with ladles having a greater capacity of, for example, 300 t, the thickness of the ladle lining necessitates flow tubes of a height which is not only difficult to produce but also demands an exceptional outlay for highly refractory material. Moreover, the use of a flow tube which is kept shorter and has a correspondingly enlarged funnel formed by the surrounding perforated blocks is also ruled out because the inlet area of such funnels also has to be kept small due to the suction which is becoming excessive and the resultant turbulence in the issuing molten material.

The object of the invention is to improve the known slide closures in such a way that, when using a pressure tube which is sufficiently high even for thick ladle linings, the advantages of the known closure design are maintained while the abovementioned problems m the actual production and the production cost are avoided.

This object is achieved in that the annular groove incision in the lower end of the flow tube is arranged in an indepedent lower part of the flow tube which is separated from an upper part by a partition running above the internal wall of the casting ladle bottom parallel to it inside the walling.

This design of the lower part of the flow tube allows the slide closure to be used even in casting ladles having a very large capacity and correspond inglythick ladle lining without changing the slide closure of the known design, the lower part of the flow tube being detachable since it can be removed downwards independently of the walling of the ladle lining, while the upper part is able to remain in the perforated blocks surrounding it optionally for the entire duration of the travel of the ladle.

The invention is described in more detail with reference to the embodiment illustrated in the drawing. The drawing shows a radial partial section through tha part of the slide closure located above the slide plate (not shown) and the flow tube lying above it and the perforated blocks.

The perforated blocks consisting of a lower block 2 and an upper block 3 stand on the bottom 1 of the casting ladle within the height of the walling of the ladle lining 4. The upper part 5a of the flow tube 5 which widens conically toward the bottom and whose upper end merges into a funnel 3a in the upper perforated block 3 is inserted into these perforated blocks. The lower part 5b of the flow tube 5 which is inserted into a circular opening la of the ladle bottom and projects beyond the upper wall 1 b thereof is inserted. The partition 6 between the upper part 5a and the lower part 5b of the flow tube 5 lies in a plane running above the wall 1 b of the ladle bottom 1.In the embodiment, the lower part 5b of the flow tube 5 has an outer annular flange attachment 7 which rests against a corresponding internal annular flange 18 of the opening la in the ladle bottom 1.

The lower part 5b of the flow tube 5 has at its downward pointing annular end 8 an annular groove incision 9 in the form of a pot which is open toward the bottom and in whose bottom the central flow channel 10 of both parts 5a and 5b of the flow tube 5 forms a central entrainment opening. The stationary end plate 11 arranged beneath the ladle bottom 1 and held in a manner which is not illustrated engages with an annularspring attachment 12 arranged on its upper sidle in the pot-shaped annular groove incision 9. The inner lateral face 12a of the annular groove attachment is formed by the wall of the flow channel 10.

As shown in the embodiment just described, the design of the lower part 5b of the flow tube 5, which can be removed and exchanged while the upper part 5a remains firmly bonded with mortar in the perforated blocks 2 and 3, is the only coupling element for the end plate 11 and this allows the flow tubes, particularly those which are intended for very thick ladle bottom linings with large ladle capacities, to be adapted to existing slide designs with economic production and also has the advantage lying outside the scope of the invention of using different qualities of material for the production of a detachable lower portion of the flow tube from those used for the upper part of the tube which remains for travel of the ladle in the perforated blocks.

1. In a casting furnace for molten steel-or other metal, the walling of the lining of which furnace includes apertured blocks defining a funnel-shaped opening in the ladle bottom, the combination of a flowtube arranged vertically in the blocks, the flow tube widening frustoconically towards its lower end and having a central flow channel which terminates at its lower end at the level of, or below, the external wall of the ladle bottom, and a detachable end plate held in place beneath the ladle bottom; the lower end portion oftheflowtube being formed separately from the remainder of the flow tube, being separated therefrom by a line of partition arranged above the

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A slide closure for casting ladles The invention relates to a slide closure for casting ladles for liquid metal, in particular steel, consisting of a flow tube which is joined to afunnel opening in the ladle bottom, stands vertically embedded in perforated blocks of the walling of the ladle lining, and widens conically toward the bottom, with a central flow channel whose lower annular end lies in the plane of the outer wall of the ladle bottom or in a plane running deeper than this, of an end plate which is detachable and is held stationarily beneath the ladle bottom and of a ceramic slide plate which extends beneath the end plate, is provided with a ceramic delivery tube, is held detachably in a slide frame and is movable and adjusted relative to the end plate, in which slide closure the lower annular end of the flow tube has a pot-shaped annular groove incision with a central opening formed by the flow channel and the end plate has an annular spring attachment which engages in this annular groove incision and whose internal lateral face is formed by the wall of the central flow channel. Known slide closures of this type can be used only for casting ladles having a restricted capacity of up to about 150 tonnes since with ladles having a greater capacity of, for example, 300 t, the thickness of the ladle lining necessitates flow tubes of a height which is not only difficult to produce but also demands an exceptional outlay for highly refractory material. Moreover, the use of a flow tube which is kept shorter and has a correspondingly enlarged funnel formed by the surrounding perforated blocks is also ruled out because the inlet area of such funnels also has to be kept small due to the suction which is becoming excessive and the resultant turbulence in the issuing molten material. The object of the invention is to improve the known slide closures in such a way that, when using a pressure tube which is sufficiently high even for thick ladle linings, the advantages of the known closure design are maintained while the abovementioned problems m the actual production and the production cost are avoided. This object is achieved in that the annular groove incision in the lower end of the flow tube is arranged in an indepedent lower part of the flow tube which is separated from an upper part by a partition running above the internal wall of the casting ladle bottom parallel to it inside the walling. This design of the lower part of the flow tube allows the slide closure to be used even in casting ladles having a very large capacity and correspond inglythick ladle lining without changing the slide closure of the known design, the lower part of the flow tube being detachable since it can be removed downwards independently of the walling of the ladle lining, while the upper part is able to remain in the perforated blocks surrounding it optionally for the entire duration of the travel of the ladle. The invention is described in more detail with reference to the embodiment illustrated in the drawing. The drawing shows a radial partial section through tha part of the slide closure located above the slide plate (not shown) and the flow tube lying above it and the perforated blocks. The perforated blocks consisting of a lower block 2 and an upper block 3 stand on the bottom 1 of the casting ladle within the height of the walling of the ladle lining 4. The upper part 5a of the flow tube 5 which widens conically toward the bottom and whose upper end merges into a funnel 3a in the upper perforated block 3 is inserted into these perforated blocks. The lower part 5b of the flow tube 5 which is inserted into a circular opening la of the ladle bottom and projects beyond the upper wall 1 b thereof is inserted. The partition 6 between the upper part 5a and the lower part 5b of the flow tube 5 lies in a plane running above the wall 1 b of the ladle bottom 1.In the embodiment, the lower part 5b of the flow tube 5 has an outer annular flange attachment 7 which rests against a corresponding internal annular flange 18 of the opening la in the ladle bottom 1. The lower part 5b of the flow tube 5 has at its downward pointing annular end 8 an annular groove incision 9 in the form of a pot which is open toward the bottom and in whose bottom the central flow channel 10 of both parts 5a and 5b of the flow tube 5 forms a central entrainment opening. The stationary end plate 11 arranged beneath the ladle bottom 1 and held in a manner which is not illustrated engages with an annularspring attachment 12 arranged on its upper sidle in the pot-shaped annular groove incision 9. The inner lateral face 12a of the annular groove attachment is formed by the wall of the flow channel 10. As shown in the embodiment just described, the design of the lower part 5b of the flow tube 5, which can be removed and exchanged while the upper part 5a remains firmly bonded with mortar in the perforated blocks 2 and 3, is the only coupling element for the end plate 11 and this allows the flow tubes, particularly those which are intended for very thick ladle bottom linings with large ladle capacities, to be adapted to existing slide designs with economic production and also has the advantage lying outside the scope of the invention of using different qualities of material for the production of a detachable lower portion of the flow tube from those used for the upper part of the tube which remains for travel of the ladle in the perforated blocks. CLAIMS

1. In a casting furnace for molten steel-or other metal, the walling of the lining of which furnace includes apertured blocks defining a funnel-shaped opening in the ladle bottom, the combination of a flowtube arranged vertically in the blocks, the flow tube widening frustoconically towards its lower end and having a central flow channel which terminates at its lower end at the level of, or below, the external wall of the ladle bottom, and a detachable end plate held in place beneath the ladle bottom; the lower end portion oftheflowtube being formed separately from the remainder of the flow tube, being separated therefrom by a line of partition arranged above the level of the internal wall of the bottom and extending parallel thereto within the walling of the lining, the inner lower edge of the lower portion of the flow tube having an annular groove forming a recess for a portion of the end plate or an attachment thereto.

2. In a casting furnace, the combination claimed in claim 1 and substantially as hereinbefore described.

3. A slidable closure comprising the combination defined in any preceding claim.