GB2027858A - Metallurgical vessel suspension system - Google Patents

Abstract

A molten metal processing vessel 12 is supported on a trunnion ring 16 by a plurality of triangular members 32 and adjustable links 65. Each triangular member is pivotally connected to the vessel and to a clamp ring 30 which engages the upper trunnion ring flange. The links are pivotally connected to the vessel and to a second clamp ring 64 which engages the lower trunnion ring flange. A plurality of disc springs 68 are disposed between the second clamp ring and the trunnion ring. <IMAGE>

Description

SPECIFICATION Metallurgical vessel suspension system This invention relates to tiltable metallurgical vessels.

One prior art vessel support is disclosed in United States Patent No. 3,146,983 wherein a plurality of links pivotally connect a converter vessel to the upper trunnion ring flange to support the vessel in a vertical position and to allow differential expansion between the vessel and the ring. However, these links are incapable of supporting the vessel when it is tilted to a generally horizontal position. Accordingly, in such prior art vessel suspension systems, it was necessary to provide a plurality of brackets adjacent the trunnion pin for supporting the vessel while the same was being turned up and turned down.

Embodiments of the invention seek to provide a metallurgical vessel suspension system which supports the vessel in its vertical and tilted positions and permits differential expansion between the vessel and a surrounding trunnion ring, to provide a converter vessel suspension system wherein mechanical load is relatively uniformly distributed around the trunnion ring, and/or to provide a support for converter vessels which does not restrict axial vessel expansion.

According to the invention there is provided a vessel including ring means at least partially surrounding said vessel, pin means extending generally horizontally and being coupled to said ring means and being adapted to be engaged by tilt means whereby said ring and vessel are tiltable about the axis of said pin means, a first plurality of members spaced around said vessel below said ring means and each being individually pivotally mounted at one end to said vessel and at their other end to said ring means, a plurality of generally triangular members disposed in spaced apart relation around said vessel and above said ring means, the opposite ends of each of said generally triangular members defining a wide base and a narrow apex, means for pivotally connecting one end of each triangular member to said vessel and the other end to said ring means and about axes generally parallel to each other and to a tangent line of said vessel, at least some of said members being disposed adjacent said pin means so that when said vessel is tilted to a generally horizontal position the stresses in said adjacent members are exerted in planes generally parallel to the planes of said members.

Embodiments of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a side elevational view with parts broken away schematically illustrating a converter vessel having a suspension system according to the present invention; Figure 2 is a cross-sectional view showing the suspension system of Fig. 1 in greater detail; Figure 3 is a view taken along lines 3-3, of Fig. 2; Figure 4 is a view taken along lines 4-4 of Fig. 2; Figure 5 illustrates one variation of a portion of the suspension assembly, and Figure 6 shows an alternative variation of a portion of the suspension assembly.

Fig. 1 shows a converter vessel 10 which is one example of a metallurgical vessel to which the suspension system is applicable. As those skilied in the art will appreciate, however, the suspension system is applicable to any metallurgical vessel which is supported within a so-called trunnion ring. The vessel 10 is shown to include a metallic shell 1 2 and a refractory lining 1 3. A top opening 1 4 permits charging of the vessel with hot metal or scrap. The vessel 10 may also have a pouring spout 1 5 which permits the discharge of its contents into a ladle or other suitable receptacle when the vessel is tipped.

As seen in Fig. 1, the vessel 10 is surrounded by a concentric trunnion ring 1 6.

Extending from each of the diametrically operative sides of trunnion ring 1 6 are a pair of coaxial trunnion pins 17, only one of which is seen in Fig. 1. Pins 1 7 are usually journaled in suitable supports (not shown) and are coupled to a suitable drive mechanism (not shown) which provides the requisite torque for tilting the trunnion ring 1 6 and the vessel 10 which it supports. The trunnion pins 1 7 may also be hollow so as to allow the entry and exit of cooling water to the interior of trunniong ring 1 6. In the illustrated examples, the interior of trunnion ring 1 6 is intended to be water-cooled but the specific details of construction are omitted since they are wellknown in the art and form no part of the present invention.

Trunnion ring 1 6 is shown in Figs. 1 and 2 to include a top ring-like flange 20 and a similar bottom flange 21 which is spaced from top flange 20 and is arranged in a generally concentric parallel relation with respect thereto. The flanges 20 and 21 are joined at their edges by an annular inner wrapper plate 22 and an annular outer wrapper plate 23 which is concentric with wrapper plate 22 and spaced therefrom in a generally parallel relation. The joints between flanges 20 and 21 and wrapper plates 22 and 23 may be secured in any suitable manner such as by welding. It will also be appreciated that trunnion ring 1 6 in the illustrated example is essentially a hollow, circular box girder.While not shown in the drawings, trunnion ring 1 6 may also be reinforced internally by a series of circumferentially spaced radially disposed plates each of which has an aperture to permit the circulation of cooling water, if desired. It will also be apparent that the vessel suspension system is applicable whether the trunnion ring 16 has a configuration illustrated in Figs.

1 and 2 or is in another form such as an Ibeam, channel or various other cross-sectional shapes.

The vessel 10 is supported on the trunnion ring 1 6 by an upper suspension assembly 26 and a lower suspension assembly 28. The upper suspension assembly 26 includes a clamp ring 30 which engages the upper flange 20 and a plurality of generally triangular links 32 which are pivotally connected at their lower ends to the ring 28 and at their upper ends to the vessel 1 2. Ring 28 is generally co-radial with top flange 20 and may comprise a single member or a plurality of arcuate segments. In transverse cross-section, ring 28 is generally L-shaped with its large leg 34 disposed above and extending parallel to top flange 20. Leg 34 of ring 28 may engage flange 20 directly or a thin metallic shock absorber pad 36 may be disposed therebetween. The shorter leg 38 of clamp ring 28 extends downwardly behind the inner edge of flange 20.

Each link 32 includes a relatively thick base portion 40 which tapers down to a thin neck portion 42. The base portion 40 of each link 32 is pivotally mounted between a pair of upstanding brackets 44 which are affixed in spaced apart relation to the upper surface of clamp ring 32. Specifically, a pivot bolt 46 extends through aligned holes 48 in brackets 44 and a bore 30 extending through base portion 40. The neck portion 42 of each link 32 is similarly pivotally mounted to vessel 10 by means of a pivot bolt 52 extending through bores 54 in neck portion 42 and aligned apertures 56 in brackets 58 which are affixed in parallel, spaced apart relation to-a ring 60 secured to the shell 1 2 generally above trunnion ring 16.The bores 50 and 52 through each link 32 are generally parallel so that the links may pivot simultaneously at its upper and lower ends relative to clamp ring 30 and vessel shell 1 2. Also, each of bolts 46 and 52 may be threaded at one end so that they may be suitably retained in position such as by means of nuts 62.

The lower suspension assembly 28 includes a second clamp ring 64 which is configured similarly to the upper clamp ring 30 and a plurality of links 65. The long leg 66 of ring 64 is disposed in a generally parallel relation to the lower flange 21 and there are a plurality of spaced apart disc springs 68 disposed therebetween. The short leg 70 of ring 64 also hooks behind the lower inside edge of flange 21.

Each of the links 65 includes a pair of eyebolts each of which includes a head portion 74 having a transverse aperture 76 and a threaded shank 78. An internally threaded sleeve 80 engages each of the shanks 78 so that the distance between the apertures 76 and hence, the length of each link 65 may be adjusted. The lower end of each link 65 is pivotally mounted by means of a bolt 81 between a pair of brackets 82 affixed in spaced apart parallel relation to a second ring 84 affixed generally below trunnion ring 1 6.

Bolts 81 extend through apertures 76 and aligned holes 86 in brackets 82. The upper end of each link 65 is similarly pivotally mounted by means of bolts 88 between a second pair of brackets 89 affixed to a lower surface of clamp ring 64. Bolts 88 extend between holes 92 in brackets 88 and through apertures 76 in the upper ends of links 65.

The bolts 81 and 88 are arranged in a generally parallel relation to permit simultaneous pivotal movement of links 65 at their opposite ends and each is threaded at one end for being secured by means of bolts 94.

While brackets 58 and 82 are shown in Fig. 2 to have substantially the same height as their respective rings 1 6 and 84, they may, for added strength, be of increased height and have portions (not shown) which engage and are affixed to the surface of shell 12.

In the preferred embodiment of the invention shown in Fig. 5, all of the upper links 32 are arranged such that their relatively larger base portions 40 are attached to upper clamp ring 30 and their relatively smaller neck portions 42 are pivotally connected to ring 60. In the alternative embodiment of the invention shown in Fig. 6, however, alternate links 32' are inverted so that their base portions 40 are pivotally connected to ring 60 while their smaller neck portions 42 are pivotally connected to clamp ring 30.

It will be appreciated that there are a plurality of links 32 of the upper suspension assembly 26 and a plurality of links 65 of the lower suspension assembly 28 which are disposed in spaced apart relation around the vessel 10 and all are pivotally connected to the vessel shell 1 2 and to the respective upper and lower clamp rings 30 and 64 in the manner discussed with respect to Figs. 2-4. This permits differential radial expansion of the vessel 10 and the trunnion ring 1 6 as the links 32 and 65 are free to pivot at their opposite ends. For example, should the vessel 10 expand radially to a greater degree than trunnion ring 16, thereby moving the shell toward the right relative to trunnion ring 1 6 as viewed in Fig. 2, the link 32 will tend to pivot clockwise about bolts 52 and 46 and the link 65 will pivot counterclockwise about bolts 81 and 88. Similar pivotal movement in the links 32 and 65 will occur should the vessel grow lengthwise as a result of the temperatures and stresses inherent in its operation. In addition, the links 32 not only support the vessel when it is in a vertical position, but the links 32 and 65 also furnish support for the vessel when it is in its various interme diate tilted positions and when it is turned up and turned down.

The clamp rings 30 and 64 absorb radial loading from the links 32 and 65 so as to minimize radial stress in the trunnion ring flanges 20 and 21. In addition, the clamp rings 30 and 64 distribute the compressive loads relatively evenly to the trunnion ring when the vessel is vertical. Further, the links 32 and 65 prevent lateral shifting of the vessel during turn-up and turn-down. This is particularly enhanced by the upper links 32 which resist sidewise deflection as a result of their generally triangular configuration. The spring washers 68 between the lower clamp ring 64 and trunnion ring 1 6 permit relative movement between the clamp ring 64 and the trunnion ring 1 6 so that links may also be used below the trunnion ring for support during tilting and when the vessel is inverted.

As a result, brackets employed in prior art systems to support the vessel during turn-up and turn-down is not required. Additionally, the adjustability of links 65 allow changes in length necessitated by changes in vessel dimensions during operation.

Claims (8)

1. A tiltable metallurgical vessel including ring means at least partially surrounding said vessel, pin means extending generally horizontally and being coupled to said ring means and being adapted to be engaged by tilt means whereby said ring and vessel are tiltable about the axis of said pin means, a first plurality of members spaced around said vessel below said ring means and each being individually pivotally mounted at one end to said vessel and at their other end to said ring means, a plurality of generally triangular members disposed in spaced apart relation around said vessel and above said ring means, the opposite ends of each of said generally triangular members defining a wide base and a narrow apex, means for pivotally connecting one end of each triangular member to said vessel and the other end to said ring means and about axes generally parallel to each other and to a tangent line of said vessel, at least some of said members being disposed adjacent said pin means so that when said vessel is tilted to a generally horizontal position the stresses in said adjacent members are exerted in planes generally parallel to the planes of said members.

2. A vessel as claimed in Claim 1 wherein said ring means includes a trunnion ring, there being a separate ring member engaging the upper surface of said trunnion ring and to which the triangular members are pivotally connected.

3. A vessel as claimed in Claim 2 compris ing a second separate ring engaging the lower surface of said trunnion ring and being disconnected therefrom, each of the first plurality of members being pivotally mounted at one end to said vessel and at their other ends to said second ring.

4. A vessel as claimed in Claim 3 comprising a resilient means disposed between said second ring and the lower surface of said trunnion ring.

5. A vessel as claimed in Claim 4 wherein there is a gap between said second ring and the lower surface of said trunnion ring, said resilient means being disposed in said gap and comprising spring washers.

6. A vessel as claimed in any one of Claims 3-5 wherein each of said first plurality of members comprises links having a first pivot means pivotally connected to said vessel and a second pivot means pivotally connected to said second ring and means for adjusting the length of each said links between their one and other ends.

7. A vessel as claimed in any one of Claims 1-6 wherein alternate ones of said triangular members are arranged with their bases pivotally connected to said first ring and their apexes pivotally mounted to said vessel and the next adjacent ones of said members being arranged with their bases pivotally mounted to said vessel and their apex portions pivotally mounted to said first ring.

8. A tiltable metallurgical vessel substantially as hereinbefore described with reference to the accompanying drawings.