JPH081312A - Template for forming interior structure of lining by partialcoating of cast material for repairing fire resisting liningof ladle - Google Patents

Abstract

PURPOSE: To develop a molding plate simply and satisfactorily executing the tight closure of the lower end in a space by pushing the outer peripheral surface of a tight-closing jacket to the inner surface of a ladle. CONSTITUTION: A refractory lining in the ladle 5 is partially repaired by using the annular molding plate 10. The molding plate 10 covers the repairing surface of the ladle 5, but arranges some interval from the ladle 5. Further, a pourable molding material 2 is poured into a space 9 between the original lining inner surface and the molding plate 10. Then, on the lower edge 11 on the molding plate 10 toward the bottom part of the ladle 5, a flexible closing jacket 23 extended over the surroundings of the molding plate 10, is disposed. The closing jacket 23 can be pushed onto the upper surface of repairing unnecessary zone 8' in the lining 7 arbitrarily with an annular element 22. In this way, a special processing, in which the zone to be repaired is closed for the remaining refractory lining, is unnecessary.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is capable of descending into a ladle for casting steel and similar metal containers, covering only a portion of the height of the ladle and slightly conical towards the bottom of the ladle. An annular template for partially applying casting material to form the internal structure of the lining for repairing the refractory lining of the ladle, the template being a ladle Covers the surface to be repaired of, but is spaced from the ladle,
The present invention relates to a template in which the casting material can be injected into the space formed between the inner surface of the original lining and the template.

[0002]

2. Description of the Related Art Recently, it has been increasing more and more that a metal container is lined by a casting technique instead of a refractory brick. In this method, the space between the template or mold defining the desired internal interior space of the ladle or other metal container and the container wall to be lined,
A refractory casting material, which usually acts with thixotropic properties, is injected, which is limited by the thixotropic properties and which is subject to vibrations (usually of the template) while It fills each void with very little flowability, if at all.

According to DE-OS 3741073, when the metal container is no longer durable, ie after wear of the inner layer of the casting material exposed to the molten metal, the remaining useful fireproof lining is not completely destroyed, but It is known to shallowly remove the rest of the slag and the surface of the original lining that was eroded by the slag. The removal is not done while producing a regular shaped surface, but a so-called peeling robot is attached to the movable arm, rolls over the surface and is provided with hard metal projections. By virtue of the tool being in contact with the surface and subjecting it to the required degree of scraping, or at least roughening, while applying the action of vibration. However, in this case, the tool follows the current contour of the original lining. The template is newly placed in a metal container equipped with the original lining thus cleaned, and then while applying vibration, a thixotropic casting is applied to the space between the template and the original lining. Refill with material. Thus, up to 50% of the expensive material for the lining can already be saved.

Such a complete regeneration of the ladle (also referred to as a complete refill) usually needs to be done only after many charges. During these complete refilling operations, especially the upper slag area and the impact area (Aufprallzone) at the bottom of the ladle.
In, it is necessary to put the ladle in a partial refilling process, where only the above area is regenerated. This is because the wear of the lining of the ladle occurs locally. This significantly reduces the operating costs caused by lining wear.

Partial repositioning is usually done with short templates, since the closure between major wear areas is usually small and a long template for complete relining cannot be easily inserted into the ladle, The short template is inserted into the ladle from above and is largely removed by the area of the lining to be regenerated, i.e. the burner previously actuated by the slag and / or the mechanically actuated peeling robot. It covers only the exposed area but is spaced from the machined surface of the lining.
Thus, the space formed between the outer wall of the template and the surface to be machined of the lining is filled with new refractory casting material which acts with thixotropy, as in the case of complete relining. It

The need to seal the lower end of the space, which is a problem with this partial refilling, is to prevent the thixotropic casting material from flowing down, ie from the space, into the container. Sealing is difficult. The special reason is
This is because, during partial refitting, the lower, unregenerated area of the lining also usually has an irregularly textured surface.

Therefore, in order to seal the lower end of the space,
Usually at the lower edge of the template, a kind of assembling foam is injected between the outer surface of the template and the surface of the lining, or at the lower edge the space for sealing is made of a wool material (e.g. silica gel). A tow or slag wheel) is injected.

However, such a known type of sealing member has a problem that the cost of recycling the ladle increases because the material required for sealing can be used only once. It has been found that the sealing is ensured by the assembled foam during the pot life of the casting material, but that the assembled foam causes particularly high costs.

[0009]

SUMMARY OF THE INVENTION The object of the invention is to develop a template in which the lower end of the space can be sealed more easily and better.

[0010]

The above-mentioned problems are solved by the fact that a flexible sealing jacket extending over the periphery of the template is installed at the lower edge of the template facing the bottom of the ladle, and This is solved by providing pressing means capable of pressing the outer peripheral surface of the closed jacket against the inner surface of the ladle.

The template of the present invention has a flexible sealing jacket extending around the periphery of the template at the lower edge facing the bottom of the ladle, and the outer peripheral surface of the sealing jacket has a suitable pressing means. Is optionally pressed against the inner surface of the ladle. What is easily possible with this measure is to close the lower end of the space by pressing the flexible sealing jacket against the surface of the lining with pressing means after placing the template in the pan. Since the sealing jacket is flexible, the sealing jacket adheres to the irregular surface of the lining so that even if the surface has large irregularities, an insufficient sealing action does not occur. The template is removed from the ladle after the pot life of the potting material has ended, after the stress of the pressing means has been removed and the closed jacket has been removed again from the inner surface of the ladle. Due to this shape of the template, a reliable sealing of the lower end of the space between the template and the surface to be machined of the lining is achieved without the need for sealing means which can only be used once.

A preferred embodiment of the template of the present invention is claim 2.
Is the content of. In this embodiment, the pressing means for pressing the sealing jacket against the surface of the lining are such that the radial support strips fixed to the template have a diameter smaller than that of the template, protruding from the lower edge of the template. Will be realized. The support strip is surrounded by a pneumatic annular element which is optionally pressurizable and flexible in cross section, the sealing jacket being in contact with the outer surface of the annular element. The pneumatic annular element is fixed in the longitudinal direction of the template. In this embodiment, pressure is applied to the pneumatic annular element so that the space is sealed by pressing the outer surface of the sealing jacket against the surface of the lining.
In this case, the pneumatic annular element is supported inwardly on a radial support strip. This construction of the template of the invention not only achieves a particularly good sealing action of the sealing jacket, but also allows the entire template to freely swing within a predetermined range by using compressible pressing means. It is achieved that the template is also particularly well adapted to the use of an inner vibrator for fluidizing the thixotropic casting material. As the inner vibrator oscillates over the template, the oscillation amplitude is adjusted to the optimum value for fluidization of the casting material by the adaptation of the air pressure in the annular element.

A pneumatic support of the pneumatic annular element is provided in the longitudinal direction of the template by means of a flexible support loop, which is provided around the template and is guided around the cross section of the element at any given time. It is preferable to fix it to (Claim 3).

In a particularly preferred embodiment according to claim 4,
The pneumatic annular element is formed as a flexible hose loupe which includes a radial support strip 36.
Since the winding is performed at 0 degree or more, the starting point region and the ending point region of the hose loop overlap each other over a certain length when viewed in the axial direction. By this measure, the sealing jacket is effectively pressed against the surface of the lining even in the starting and ending regions of the horus, in which region the casting material which acts with thixotropic properties does not undesirably flow out. Is guaranteed.

A particularly preferred construction of the template is the subject matter of claim 5. In that configuration, the radial support strips include
An opening is formed that guides the end of the hose loop, which connects to the pressurizing device, through the interior of the template to the outside. The hose wrap is manufactured by a commercially available digestive hose, at least one end of which is connected to a pressurizing device, such as a compressor or a compressed air cylinder.

The structure of the template of the present invention as defined in claim 7 is particularly preferable. In the structure, the flexible sealing jacket is
It is made up of a hermetically-sealed segment that surrounds itself and partially overlaps. With this configuration,
Even if the surface of the lining is very uneven, it ensures a uniform contact of the sealing jacket. This is because the partially overlapping sealing segments can be offset from each other, which significantly increases the flexibility of the sealing jacket.

Experiments have shown that when the sealing jacket according to claim 8 is made of rubber, a very good sealing of the sealing jacket is achieved. However, the sealing jacket can also be made of flexible plastics or fibers or composites of flexible materials.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Hereinafter, the terms "upper" and "lower" refer to the positions illustrated by the template mounted on the upright ladle.

The installation, generally designated 100 in FIG. 1, comprises a silo 1. The silo 1 comprises, for example, two chambers containing a casting material 2 for producing the lining 7. The casting material 2 is mixed with the liquid components in a mixer 3 installed below the silo 1 and supplied via a conveyor belt 4 to a distribution belt 6 installed above the ladle 5 to be repaired. . The distribution belt 6 is rotatably supported about the axis of symmetry L of the ladle 5, so that the casting material 2 is evenly distributed around the lining 7 of the ladle 5. An annular template 10 which occupies only part of the height of the internal space of the ladle 5 is placed on the ladle 5 from above, the template 10 covering the upper area 8 of the lining 7 to be restored,
Spaced from the surface of the lining 7 in the upper region 8, a space 9 is formed between the surface and the template 10.
The casting material 2 is poured into the space 9. The template 10 has a sealing means 12 on the lower edge 11 facing the bottom of the ladle 5, which sealing means 12 defines a space 9 with respect to the still well preserved lower area 8 ′ of the lining 7. Used for sealing.

Hereinafter, the technical structure and operating method of the template 10 will be described in detail with reference to FIGS. At the upper edge of the template 10, which is shown in a vertical section in FIG. 2 and which tapers slightly downwards in a conical shape, is provided a lug 13 which projects laterally, which lug 13 is The ladle 5 is supported by the upper edge of the ladle 5 while being placed on the ladle 5. The lug 13 is the template 10
Is provided with a holding portion 14 for hanging the hoist on a hoist, for example, a crane. A plurality of inner vibrators 29 are arranged on the inner surface of the template 10, and only one of them is shown in FIG. 2, for example. The inner vibrator 29 is used to fluidize the thixotropic casting material by rocking the entire template 10. At the lower edge 11 of the template 10 facing the bottom of the ladle 5, a support ring 17 perpendicular to the axis of symmetry L and a cylindrical support sleeve 18 surrounding the support ring 17 on the outside are provided. Are attached by means of mounting angles 16 and the support sleeve 18 extends coaxially to the axis of symmetry L and has a diameter slightly smaller than the lower edge 11 of the template 10. Adjacent to the support sleeve 18 are elongated hole-shaped openings 19, 1 that are adjacent but axially and radially separated from each other.
9'is formed and the longitudinal length (Laengsausdehnung) of the openings 19, 19 'extends at right angles to the axis of symmetry L. The openings 19 and 19 ′ are two hoses of one hose loop 21 that circulates along the outer surface of the support sleeve 18.
It is used to pass the end portions 20, 20 '. The hose loupe 21 is guided around the support sleeve 18 along a substantially horizontal plane such that the starting and ending regions of the hose loupe 21 overlap between the openings 19, 19 '. That is, it extends vertically over a small length (eine kurze Strecke). At least one of the hose ends 20, 20 is associated with a pressure device (not shown) and the other hose end is pressure-stable closed.

The air loop element 22 thus formed by the hose loop 21 around the support sleeve 18 extends from the lower edge 11 of the template 10 into a flexible sealing jacket 23. The annular element 22 can optionally be pressed onto the upper surface of the repair-free area 8'of the lining 7 (see FIG. 3). Flexible closed jacket 2
Since 3 is constituted by a sealing segment which is provided around the periphery of itself and partially overlaps with each other, the sealing jacket 23 contacts the upper surface of the lower region 8 ′ of the lining 7 without substantially wrinkling. And therefore a good sealing action is achieved. As is apparent from FIG. 3, the sealing jacket 23 is fixed to the template 10 by the tightening means 24 installed outside the mounting angle 16. In the tightening means 24, the loose plate 26 can be tightened by the bolt 25 to the plate 27 fixedly attached to the mounting angle 16. The tightening means 24 is likewise a flexible support loop 28 which is circumferentially provided around the template 10.
Used to fix the. The hose loop 21 extends through the support loop 28 and is fixed in the direction of the axis of symmetry L of the template 10.

In order to partially replace the lining 7,
The template 10 of the present invention is lowered into the ladle 5 when the hose loop 21 is pressureless. By applying pressure to the hose loupe 21 while the casting material 2 is not being fed into the space 9, for example in the manner shown in FIG.
While being supported by the support sleeve 18, the closed jacket 23
The lower area 8'of the lining 7 which is still somewhat conserved
The space 9 is securely sealed downward by pressing against the surface.
The casting material 2 is compressed by vibrating the template 10 by the inner vibrator 29 while the thixotropic casting material 2 is injected into the space 9. The amplitude of the template vibration is influenced by the height of the pressure applied to the pneumatic annular element 22. After the thixotropic casting material 2 has solidified, the pressure is released from the hose loupe 21 so that the sealing jacket 23 separates from the surface of the lining 7 and together with the template 10 the restored ladle. Taken out from 5. Thus, the template 10 thus constructed can be used repeatedly and does not require special measures to seal the area to be repaired for the remaining refractory lining.

[Brief description of drawings]

FIG. 1 provides a thixotropic casting material,
FIG. 3 is a side view, partially in section, of equipment preferably using the template of the present invention.

FIG. 2 is a vertical cross-sectional view of the template of the present invention.

FIG. 3 is a view of the arrangement of the sealing jacket and pneumatic support elements shown in part III of FIG.

[Explanation of symbols]

2 ... Casting material, 5 ... Ladle, 9 ... Space, 10 ... Template, 11
... Lower edge, 18 ... Support strips, 19, 19 '... Opening, 21 ... Hose loop, 22 ... Annular element, 23 ... Sealing jacket, 28 ... Support loop.

Claims (8)

[Claims] 1. A ladle (5) for casting steel and similar metal containers which can be lowered, cover only part of the height of said ladle (5) and are slightly conical towards the bottom of the ladle. An annular template (10) that is thin in shape and is used to partially apply the casting material (2) to restore the refractory lining of the ladle (5) to form the internal structure of the lining. ), And
The template (10) covers the surface of the ladle (5) that is to be repaired, but is spaced from the ladle (5) so that the inner surface of the original lining and the template ( 10)
A mold plate (10) in which the casting material (2) can be poured into a space (9) formed between the mold plate (10) and the mold plate (10) facing the bottom of the ladle (2). A flexible closed jacket (23) extending around the template (10) is installed on the lower edge (11), and the outer peripheral surface of the closed jacket (23) is attached to the ladle ( 5) A template provided with a pressing means capable of pressing the inner surface. 2. The pressing means comprises: a) fixed to the template (10), protruding from the lower edge (11) of the template (10) and having a smaller diameter than the template (10). Radial support strips (18)
B) optionally completely around the radial support strip (18), supported on the one hand on the outer surface of the support strip (18) and on the other hand on the inner surface of the flexible sealing jacket (23), It is pressurizable, has a flexible cross-section, and presses the closed jacket (23) under pressure in the ladle (5).
A pneumatic annular element (22) for pressing against the inner surface of the plate, and (c) means for fixing the pneumatic annular element (22) in the longitudinal direction of the template (10). The template according to 1. 3. The flexible means is fixed to the mold plate (10), is circumferentially provided around the mold plate (10), and through which the pneumatic annular element (22) passes. 3. The template according to claim 2, characterized in that it is a supporting loop (28). 4. The pneumatic annular element (22) is a flexible hose loupe (21), said hose loupe (2).
1) 360 the radial support strips (18)
Since it is wound more than once, the starting point region and the ending point region of the hoist loop (21) overlap each other over a certain length when viewed in the axial direction. Alternatively, the template according to item 3. 5. The radial support strip (18)
An opening (19, 19 ') is formed in the end for guiding the end of the hose loop (21) connected to a pressurizing device to the outside through the inside of the template (10). The template according to claim 4, wherein 6. Template according to claim 4 or 5, characterized in that the hose loupe (21) is produced from a commercially available digestive hose. 7. The flexible sealing jacket (23)
The template according to any one of claims 1 to 6, wherein the template is provided by a closed segment which is provided around the periphery of itself and partially overlaps with each other. 8. Template according to any one of the preceding claims, characterized in that the flexible sealing jacket (23) is made of rubber.