MXPA99000015A

MXPA99000015A - Obtured rod

Info

Publication number: MXPA99000015A
Application number: MXPA/A/1999/000015A
Authority: MX
Inventors: Kremer Alfred; Langer Gerhard
Original assignee: Foseco International Limited
Priority date: 1996-07-02
Filing date: 1999-01-04
Publication date: 2000-06-01

Abstract

A sealing rod (50) in the form of an elongated shaped body having a longitudinal perforation (51), has a fixing means for fixing the sealing rod to an ascending and descending mechanism. The fixing means comprises a first sleeve (10) to be molded in situ, in the body of the sealing rod (50) to be coaxially with the body of the sealing rod (50) in an annular recess (52) surrounding and which is co-terminal with the perforation (51), the sleeve (10) has a pair of arcuate tabs separated circumferentially directed inwards (11, 12), a connecting rod (20) of diameter to fit within the bore of the rod shutter (51) and, a length to extend to the outside of the sealing rod (50) while passing through the first sleeve (10) when the sleeve (10) is in position in the sealing rod (50), the connecting rod (20). ) has a pair of circumferentially spaced arcuate shoulders (22, 23) in size to pass through the spaces between the flanges (11, 12) of the first sleeve (10), whereby the connecting rod (20) can be passed through of the first cuff (10) until its shoulders (22, 23 ) have passed beyond the tabs (11, 12) of the first sleeve (10) and then rotated until their shoulders (22, 23) correspond circumferentially with the flanges (11, 12), and a second sleeve (30) of external diameter to fit in the perforation (51) of the sealing rod (50) and having at one end a pair of arcuate projections, circumferentially spaced, extending axially, the projections (32), have an internal radius sufficient to accommodate the rod (20) through the second sleeve (30) and the projections (32) being of a size to fit within the spaces between the flanges (11, 12) of the first sleeve (10) whereby the shoulders (22) , 23) of the connecting rod (20) can be fastened beyond the flanges (11, 12) of the first sleeve (1).

Description

"SHUTTERING ROD" This invention relates to a sealing rod and particularly to a means for attaching a sealing rod to an ascending and descending mechanism. Sealing rods are well known to be used to control the flow of molten metal from a container, e.g. a refractory trough inside a mold. A refractory rod is raised and lowered by an appropriate mechanism positioned adjacent to the container and may thus be used to completely or partially close or completely open the outlet of the container, thereby controlling the flow of the metal from the container. Conventionally, a sealing rod is formed as an elongated, one-piece graphite structure ligated by isostatic pressing into an appropriate mold. The sealing rod usually has a hollow structure since it is formed to have a longitudinal perforation, centrally positioned by the use of an appropriate separable core in the mold. The lower end of the piercing of the sealing rod may be closed or it may be vented to allow the gas, e.g. argon is passed through the rod.

In this way, in a conventional manufacture of a sealing rod, the silk graphite composition is placed around a separable perforation in a deformable mold, ie the graphite composition fills the space of the mold between the core and the deformable mold. . The deformable mold is then placed in a liquid tank, for example, of water and the liquid pressure is increased by known means to the pressure required to convert the graphite composition into the desired self-supporting structure. After the removal of the product isostatically pressed from the mold, the core is removed to provide a hollow plug rod.

! The upper end of the rod must be provided with a means by which it can be attached to the ascending and descending mechanism. Several previous propositions have been made, including co-pressing a threaded bushing on the upper end of the sealing rod to receive a threaded shaft, forming the upper end of the rod bore with an internal thread to receive an insert, e.g. of the material - ceramic and place a retaining pin through the co-terminal holes drilled through the plug rod and a fixing rod. Even though each of the previous propositions has certain merits, none is entirely - - satisfactory and, therefore, an object of the present invention is to provide an improved means for attaching a sealing rod to an ascending and descending mechanism. Accordingly, in one aspect, the present invention * provides a means for attaching a sealing rod in the form of an elongate shaped body having a longitudinal perforation to an ascending and descending mechanism, the means comprising a first sleeve to be molded in in the body of the sealing rod to be coaxially with the body of the sealing rod and an annular recess surrounding and co-terminating with the perforation having the sleeve a pair of arcuate tabs circumferentially separated, directed inwards, a connecting rod diameter to fit within the piercing of the sealing rod and length to extend to the outside of the sealing rod, while passing through the first sleeve when the sleeve is in position in the sealing rod, the connecting rod has a pair of arched shoulders , separated circumferentially in size to pass through the spaces between the tabs d the first sleeve by which the connecting rod can be passed through the first sleeve until its shoulders have passed beyond the flanges of the first sleeve and then rotated until the - espaldones remain in circumferential relation with the eyelashes, and a second sleeve of internal diameter for fitting into the piercing of the sealing rod and having at one end, a pair of circumferentially spaced, arcuately extending projections extending axially, the projections having an internal radius sufficient to accommodate the connecting rod through the second sleeve, and the projections being of a size to fit within the spaces between the tabs of the first sleeve, whereby the shoulders of the connecting rod can be clamped beyond the tabs of the first sleeve. In a second aspect, the invention provides a sealing rod equipped with a means for attaching to an ascending and descending mechanism as defined in the immediately preceding paragraph. The connecting rod is preferably externally threaded, for at least a portion of its length intended to extend from the sealing rod, whereby it can be screwed into a corresponding portion of the ascending and descending mechanism. (The ascending and descending mechanism itself may by itself be used conventionally in another way). The means of connection - Alternative between the connecting rod and the ascending and descending mechanism however can be used, if desired. - The perforation of the sealing rod can extend through the entire length of the sealing rod or, if desired, the lower end of the perforation of the sealing rod can be closed. In those embodiments where the lower end of the sealing rod is ventilated, that is, the perforation, although of possibly reduced diameter extends through it, so that the gas, e.g. argon, can be passed through the sealing rod, the rod must also have a hole that extends axially for that object. The first sleeve, which can be of any suitable material, e.g. metal or ceramic material, is conveniently molded into the desired production in the body of the sealing rod during the molding of that body. In this way, for example, during the otherwise conventional isostatic pressing of the sealing rod in a mold containing a core prepared to define the perforation, the first sleeve is placed in the desired position in the mold. The first sleeve may be circular in plan view, but this is not essential. For example, it can be provided with one or more "flat pieces", is - say, flat side portions around its periphery, in order to achieve better grip towards the position when molded in situ in the body of the sealing rod. The second sleeve can also be of any suitable material, e.g. metal or ceramic material. Preferably, the second sleeve is of a height such as to have its end remote from its projections being at or very close to the plane of the upper end of the sealing rod when the fixing means is accommodated. It is preferably of outer diameter in such a way that it fits hermetically into the bore at the upper end of the sealing rod. In a preferred embodiment, a perforated pressure disk is carried in the rod and is kept under pressure against the upper face of the plug rod. In this way they can maintain the pressure with their end of the second sleeve and in this way ensure that, during the use of the sealing rod, the second sleeve can not move upwards of the rod and thus loosen the held nature of the means of fixation. The pressure can be maintained by a nut screwed into the connecting rod and rotated along the rod until it rests sufficiently on the disc.

If desired, of course, alternative means may be used to provide the pressure axially inward at the end of the second sleeve, to ensure that it remains in the clamped position. A sealing means may be provided, as required. For example, a sealing washer can be placed between the pressure disc and the upper face of the sealing rod between the upper face of the flanges of the first sleeve, and the face corresponding to the second sleeve. The embodiments of the invention will now be described by way of example, with reference only to the accompanying drawings, in which: Figure 1 is a longitudinal section through the first sleeve; Figure 2 is a plan view of the sleeve of Figure 1; Figure 3 is a longitudinal section through a connecting rod; Figure 4 is a plan view of the rod of Figure 3; Figure 5 is a longitudinal section through a second sleeve; Figure 6 is a plan view of the sleeve of Figure 5; Figure 7 is a section through a pressure disc; Figure 8 is a partially sectioned view showing the fastening means assembled at the upper end of the sealing rod; Figure 8A is an amplified view of area A of Figure 8; Figure 9 is a view similar to Figure 8, but with the assembly having been rotated through 90 ° about its longitudinal axis, and Figures 10, 11 and 12 are sections similar to Figure 7, through alternative forms of the pressure disc. In Figures 1 and 2, a first sleeve 10 is shown having a pair of circumferentially spaced, inwardly directed, arcuate flanges 11, 12, each placed a short distance equal axially from one end 10A of the sleeve. The end 10A of the sleeve will remain in the upper part when it is molded in a sealing edge, ie it will be closer to the upper working surface of the sealing rod during use. Each flange has a flat upper surface HA, 12A respectively, an axially extending inner face 11B, 12B respectively and an inclined lower face 11C, 12C - respectively. As shown, the outer perimeter of the sleeve is not a complete circle but has a flat side to increase the clamping effect when the sleeve is molded in a body of the sealing rod. Circumferentially, between the tabs 11 and 12 there remains an opposite pair of frusto-annular spaces 13 and 14. The circumferential arc of each of the spaces 13 and 14 can extend through an angle a, defined by the arrows in Figure 2, which is a little larger than 90 °, eg of 96 °. Therefore, the arcuate extension of the spaces 13 and 14 is a little larger than the arched extension of the flanges 11 and 12. In FIGS. 3 and 4 a connecting rod 20 having a longitudinally extending through hole 21 is shown. At one end 20A of the rod, which will be the upper end during use, the bore 21 is stepped to provide a wider mouth portion 21A to receive a connector with a gas line, usually argon. The outer surface of the rod 20 is provided towards its lower end with an opposite pair of circumferentially spaced arcuate shoulders 22, 23. Each shoulder has an inclined upper surface 22A, 23A respectively, an axially extending outer face 22B, 23B respectively and a surface - flat interior 22C, 23C, respectively. The arched extension of the shoulders 22, 23, that is, the angle b defined by the arrows in Figure 4, is smaller than that of the annular spaces 13 and 14 of the first sleeve. In this way, the shoulders 22 and 23 can pass through the spaces 13 and 14, when the rod 20 is passed through the sleeve 10. In Figures 5 and 6 a second sleeve 30 is shown. This has a body 31 cylindrical on one end 31A of which a pair of circumferentially spaced, arcuate, axially extending projections 32 are provided. The projections 32 are of equal arcuate length and each is tapered at their ends to a point 33. The external arc of each of the projections 32 is smaller in diameter than that of the internal diameter of the cylindrical body 31. Each of the projections 32 extends through an arc of about 90 ° so that the arc between the adjacent ends of the two projections, the angle d defined by the arrows in Figure 6, is also about 90 °. Therefore, the arched projections 32 are of a size small enough to fit into the spaces 13 and 14 of the first sleeve 10.

Figure 7 shows a pressure disc 40 having main faces 40A, 40B and a central bore 41. Projecting from a face 40B there is a small protrusion 42, in the form of an annular rib surrounding and spaced from the bore 41. In Figures 8 and 9 it is shown in the fixing means in position at the upper end of the rod 50, which has an axial perforation 51 centrally positioned. The perforation 51 is stepped to provide an annular recess 52 extending around the perforation. A first sleeve 10 has been molded in situ in the recess 52 during manufacture of the sealing rod 50. The sleeve 10 is of construction as shown in Figures 1 and 2 with the exception that it is provided with one or more openings through its wall. A pin 15 is provided in each opening so as to project inwardly within the recess 52. The sleeve 10 has a pair of inwardly directed annular flanges, only one of which, the flange 2 can be seen. The construction rod 20 as shown in Figures 3 and 4, has been passed to the bore 51 of the sealing rod until its shoulders 22, 23 of which only the shoulder 23 can be seen in Figure 8, has passed. through the annular spaces between the shoulders 11 and 12. The pins 15 through the sleeve 10, they limit the path of the rod 20 to the bore 51, providing an obstruction to its shoulders 22, 23. The rod 20 is then rotated until its shoulders are directly below that of the sleeve 10 and then move upwards until the faces of the upper and lower angle respectively of the shoulders and flanges of the connecting rod and the sleeve remain in contact. In this configuration, the annular broaches 13 and 14 of the sleeve 10 are empty. The second sleeve 30 having slid towards the rod 20, has been pushed down into the bore 51 so that its axial projections 32 fit within the annular spaces 13 and 14. The sleeve 30 is of a length such that in this position, its upper end is essentially flush with the upper end of the sealing rod 50. The seals 60, only one of which is shown, have been placed between the lower face 31A of the sleeve 30 and the flat upper faces HA, 12A of the sleeve 10. A sealing washer 61 is placed on the upper face of the sealing rod 50 with the connecting rod 20 passing through it. The pressure disk 40 is placed on the rod to be in contact with the sealing washer 61. A nut 62 is screwed into the rod 20 and rotated downwardly in contact with the upper face 40A of the pressure disc 40 to compress the washer 61 under the disc 40 so that the rib 42 from the lower face 40B of the disc 40 , it is pressed towards the washer 61. By this means, that is to say, the downward rotation of the nut 62, the components of the fastening means are clamped together firmly and it is impossible for the rod 20 to move relative to the plug rod 50. The connecting rod 20 can then be secured securely in an ascending and descending mechanism for the sealing rod. Figure 8A shows the region A of Figure 8 in greater detail, that is, the region where the upper end of the second sleeve 30 comes into contact with the sealing washer 61 under the pressure disc 40 and the nut 62. As will be seen, the upper end of the sleeve 30 extends slightly above the upper end of the body 50 of the sealing rod and provides a corresponding indentation in the washer 61. By this means, the second sleeve 30 can compensate for the thermal expansion of the sleeve. connecting rod 20 during the use of the sealing rod and in this way ensuring that a good seal is maintained.

- - Figure 9 is a view similar to Figure 8 ^ _ with the assembly having been rotated about its longitudinal axis as explained above. The pressure disc 40 may have a variety 5 of different shapes depending on the locations and shapes of the protuberances or indentations in order to increase the pressure sealing effect. See for example, Figures 11, 12 and 13, where the pressure discs 40 ', 40"and 40" are respectively shown. The disc 40' has a protrusion 43 from its lower face being in the protrusion in the form of an annular rib adjacent to the central bore 41 'through the disc 40' The disc 40 '' has an indentation 45 in its bottom surface, the indentation being in the form of an annular groove of flat bottom that surrounds and that is ^ fc, separated from the central hole 41", and a portion 47" of edge at an angle in the joint of its lower face and the hole 41"'__. The disk 40'" 'is similar to the disk 40'. ', but its annular groove 48 is round bottom and the edge portion 49 leading towards the central hole 41' '' is also rounded.

Claims

R E I V I N D I C A C I O N E S:

1. A means for fixing a sealing rod (50) in the form of an elongated shaped body having a longitudinal perforation (51), for an ascending and descending mechanism, characterized in that the means comprises a first sleeve (10) to be molded in situ, in the body of the sealing rod (50) to be coaxially with the body of the sealing rod (50) in an annular recess (52) that surrounds and remains co-terminal with the perforation (51), the sleeve (10). ) has a pair of circumferentially inwardly spaced arcuate tabs (11, 12), a connecting rod (20) in diameter to fit within the perforation (51) of the sealing rod and the length to extend to the outside of the sealing rod ( 50) while passing through the first sleeve (10), when the sleeve (10) is in position on the sealing rod (50), the connecting rod (20) has a pair of circumferentially spaced, arcuate shoulders (22, 23) in size to pass through the spaces between the flanges (11, 12) of the first sleeve (10), whereby the rod (20) can be passed through the first sleeve (10) until its shoulders (22, 23) have passed beyond the flanges (11, 12) of the first sleeve (10) and then rotated until their shoulders (22, 23) are in circumferential relation with the flanges (11, 12), and a second sleeve (30) of external diameter to fit the perforation (51) of the sealing rod (50) and having at one end a pair of circumferentially spaced, arcuate, axially extending projections (32), the projections (32), have a radius enough internal to accommodate the rod (20) through the second sleeve (30) and the projections (32) being of a size to fit within the spaces between the flanges (11, 12) of the first sleeve (10) by means of which the shoulders (22, 23) of the connecting rod (20) can be attached beyond the flanges s (11, 12) of the first sleeve (10).

The fixing means according to claim 1, characterized in that the connecting rod (20) is externally threaded through at least a portion of its length designed to extend from the sealing rod (50).

The fixing means according to claim 1 or claim 2, characterized in that the connecting rod (20) has an axially extending bore (21).

The fixing means according to any of claims 1 to 3, characterized in that the first sleeve (10) is circular in plan view.

The fixing means according to any of claims 1 to 3, characterized in that the first sleeve (10) has portions of flat sides around its periphery.

The fastening means according to any of claims 1 to 5, characterized in that the connecting rod (20) bears a perforated pressure disc (40, 40 ', 40", 40"').

The fastening means according to claim 6, characterized in that the connecting rod (20) has a threaded nut (62).

The fixing means according to any of claims 1 to 7, characterized in that a sealing washer (60) is placed between the upper faces of the flanges (11, 12) of the first sleeve (10) and the corresponding face (3LA) of the second sleeve (30).

9. A sealing rod (50) fitted with a fixing means to an ascending and descending mechanism, characterized in that the means is a fixing means in accordance with claim 1.

10. A sealing rod (50) according to the claim 9, characterized in that the perforation (51) of the sealing rod extends through the entire length of the sealing rod (50).

A sealing rod (50) according to claim 9, characterized in that the lower end of the perforation (51) of the sealing rod is closed.

12. A sealing rod (50) according to any of claims 9 to 11, characterized in that the height of the second sleeve (30) is such that the end of the sleeve (30) is distant from its projections (32) is in or very close to the plane of the upper end of the sealing rod (50).

A sealing rod (50) according to any of claims 9 to 12, characterized in that _ the outside diameter of the second sleeve (30) is such that the sleeve (30) is in a tight fit in the bore (51). ) at the upper end of the sealing rod (50).

A sealing rod (50) according to any of claims 9 to 14, characterized in that a perforated pressure disc (40, 40 ', 40", 40"') is carried on the connecting rod (20) and it is kept under pressure against the upper face of the sealing rod (50). -

15. A sealing rod (50) according to claim 14, characterized in that the pressure is maintained by a nut (62) screwed into the rod (20) and rotated along the connecting rod (20) until it is supported enough on the disk (40, 40 ', 40' ', 40' ''). A sealing rod (50) according to claim 14 or claim 15, characterized in that a sealing washer (61) is placed between the pressure disc (40, 40 ', 40' ', 40' '') and the upper face of the sealing rod (50). - SUMMARY OF THE INVENTION A sealing rod (50) in the form of an elongated shaped body having a longitudinal perforation (51), has a fixing means for fixing the sealing rod to an ascending and descending mechanism. The fixing means comprises a first sleeve (10) to be molded in situ, in the body of the sealing rod (50) to be coaxially with the body of the sealing rod (50) in an annular recess (52) surrounding and which remains co-ter inal with the perforation (51), the sleeve (10) has a pair of arcuate flanges separated circumferentially directed inwards (11, 12), a connecting rod (20) of diameter * to fit inside the perforation of the sealing rod (51) and a length to extend to the outside of the sealing rod (50) while passing through the first sleeve (10) when the sleeve (10) is in position in the sealing rod (50), the rod (20) has a pair of circumferentially spaced arcuate shoulders (22, 23) in size to pass through the spaces between the flanges (11, 12) of the first sleeve (10), whereby, the connecting rod (20) can be passed from the first sleeve (10) until its shoulders (22, 23) have passed beyond the flanges (11, 12) of the first sleeve (10) and then rotated - - until their shoulders (22, 23) correspond circumferentially with the flanges (11, 12), and a second sleeve (30) of external diameter to fit in the perforation (51) of the sealing rod (50) and that has a end a pair of arcuate projections, circumferentially separated, extending axially, the projections (32), have an internal radius sufficient to accommodate the rod (20) through the second sleeve (30) and the projections (32) being of a size to fit within the spaces between the flanges (11, 12) of the first sleeve (10), whereby the shoulders (22, 23) of the connecting rod (20) can be fastened beyond the flanges (11, 12) of the first cuff (10).