JPS6411683B2 - - Google Patents

Abstract

1. Converter consisting of a vessel (10) supported by a ring (12) which surrounds it and is fitted with two diametrically opposed trunnions (14) allowing the vessel to tilt on a horizontal axis, the vessel being fitted with brackets (16) resting on the upper side of the ring when the vessel is vertical and its spout at the top, characterized by the fact that the said brackets (16) are attached to the ring by mushroom-shaped parts (26) whose cap (30) is situated above the base plate (18) of the brackets (16) and whose foot (29), which passes through the said base plate, rests on the upper side of the ring (12) and is made an integral part of the latter by means of attachment rods (28) which pass through the ring (12) on a parallel with its axis and exert predetermined clamping stresses on the said parts (26) allowing them to be prestressed and joined together with the ring, without clearance, and by the fact that the passages (34) provided in the base plates of the brackets for the foot of the said parts have greater dimensions than those of the said feet to allow the differential expansion of the vessel (10) and ring (12) and by the fact that during installation a clearance (j) is left between the cap (29) of the said parts and the base plate (18) of the brackets so that the latter can slide freely over the ring under any circumstances.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is characterized in that a furnace body is supported by an annular portion surrounding the furnace body, and two journals provided on both sides are connected to each other through the diameter of the annular portion. The furnace body is thus made tiltable about a horizontal axis, and when the furnace body is in a vertical position with the mouth upward, the bottom plate of the bracket on the top surface of the annular portion is connected by means of a connecting device including bolts and nuts. The present invention relates to a steelmaking converter connected to the annular portion.

[Conventional technology]

Such a device is known from Japanese Patent Publication No. 48-4688. This is because when the bottom plate and the annular part of the bracket are connected using a bolt/nut device, a gap is created between the through hole in the bottom plate and the bolt to enable relative sliding due to the difference in thermal expansion between the bottom plate and the annular part. This is intended to prevent deterioration due to deformation. However, even though there are various inclusions, in this device, the bottom plate of the bracket and the annular portion are crimped and tightened by a bolt-and-nut device. In this case, it is difficult to tighten the bolts so that the bottom plate of the bracket slides on the annular part, and when the converter is turned over and the furnace belly is reversed, there is no gap between the bottom plate of the bracket and the annular part. In other words, if the bolts and nuts are tightened too much, the brackets will not slide on the annular part, and conversely, if the bolts and nuts are tightened to a level that allows sliding due to expansion, the annular part will not slide when the furnace body is turned over. A gap is created between the bolt and the bracket, and the weight of the heavy furnace body puts a strain on the tensile strength of the bolt, causing it to break quickly.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION It is an object of the present invention to have a simple structure, allow the connected parts to move relative to each other due to thermal expansion, and not undergo undue thermal deformation, and also to allow the connected parts to be connected regardless of the position of the furnace body. To provide a converter for steel making that can easily support loads.

[Means for solving problems]

In order to achieve the above objects, the present invention provides a furnace body supported by an annular portion surrounding the furnace body, and two journals provided on both sides across the diameter of the annular portion. The furnace body is tiltable about a horizontal axis, and when the furnace body is in a vertical position with the mouth upward, a bottom plate of a bracket on the upper surface of the annular portion is connected to the annular portion by a connecting device including a bolt and a nut. In a converter for steelmaking, a mushroom-shaped member consisting of a cap and a foot is integrated with an annular part by the bolt and the nut, and the foot of the mushroom-shaped member is inserted into a through hole in the bottom plate. , the diameter of the through hole of the bottom plate is made larger than the diameter of the foot part and smaller than the diameter of the cap part, and the length of the foot part is made somewhat longer than the thickness of the bottom plate, so that the lower surface of the cap part It is an object of the present invention to provide a converter for steel making characterized in that a small gap is provided between the upper surfaces of the bottom plate.

[Effect]

With the above configuration, in the normal position of the furnace body, the horizontal and vertical gaps between the mushroom-shaped member and the bottom plate of the bracket compensate for thermal expansion and the resulting relative sliding, and the annular body The bracket is supported, and the tightening of the bolts and nuts can give sufficient initial stress to the mushroom-shaped member, so even when the furnace body is turned over, there will be no gap between the annular part and the bottom plate of the bracket, and the bottom plate will remain intact. The bolt is supported by the annular body through the cap of the mushroom-shaped member, thereby reducing the risk of damage due to excessive load applied to the bolt.

〔Example〕

An axial bore may be bored in the mushroom-shaped member for the passage of the bolt, and at least one of the ends of the bolt is threaded, and the mushroom-shaped member and the annular part are assembled with a predetermined tightening stress. A nut is provided which is capable of generating a compressive stress in the mushroom-shaped member for applying an initial stress to the mushroom-shaped member.

In the preferred embodiment, forces parallel to the axis of the furnace body are transmitted to the annulus only by two brackets located above the journal. In this case, when the furnace body is in the vertical position and the tip is upward, each bracket rests above the annulus in two support zones located symmetrically with respect to the plane containing the axis of the furnace body and the journal. The connection between each bracket and the annular part is ensured by two mushroom-shaped members each fixed to one of the support zones of the annular part.

Forces perpendicular to the plane containing the axes of the furnace body and the journal are exerted by projections connected to the furnace body and above and below the journal that engage with notches formed in the annulus; The planes of the protrusion and notch cooperating to transfer the force are parallel to the plane, and the protrusion does not transmit any forces parallel to the axis of the furnace body to the annulus.

A force parallel to the plane of the annular portion and the plane containing the axes of the furnace body and journal is connected to the furnace body,
The surface of the protrusion and the notch, which cooperate to transmit the force, is pulled together by a protrusion that engages a notch formed in the annular part at an angle of 90° to the journal, and the surfaces of the protrusion and notch that cooperate to transfer the force are in the plane. the protrusion does not transmit any forces parallel to the axis of the furnace body to the annulus.

Other features and advantages of the invention will be explained in more detail below with reference to the embodiments described above by way of non-limiting example and with reference to the accompanying drawings.

The illustrated converter includes a furnace body 10 and an annular portion 12 with two journals 14 adapted to be mounted on fixed bearings.

When the furnace body 10 is in the vertical position, ie, with the tip upward or downward, the furnace body 10 is supported by two brackets 16 connected thereto, in which case the brackets 16 are connected to the journal 1.
4 and is connected to the annular portion 12 by means of a device described below. Each bracket 16 includes a bottom plate 18 and a top plate 20 welded to the walls of the furnace body 10, and stiffening ribs connecting the top plate 20 and the bottom plate 18. Two sliding plates 22 located symmetrically with respect to a plane including the axis of the journal 16 and the furnace body 10, that is, a plane including the axis XX in FIG. 4, are fixed to the lower surface of the bottom plate 18. . As shown in FIG. 1, when the furnace body 10 is vertical and the tip is upward, the sliding plate 22 is placed on a sliding plate 24 fixed to the upper surface of the annular part. Sliding plate 22 or 24
is made of metal with a low coefficient of friction, or
A surface treatment is applied to reduce frictional forces and allow free expansion of the furnace body 10.

Each bracket 16 is used to support the furnace body 10 when the furnace body 10 is reversed with the tip end facing downward.
is connected to the annular part 12 via two mushroom-shaped members 26 fixed to the annular part 12 on the sliding plate 24 by bolts 28 parallel to the axis of the furnace body 10.

As shown in FIG. 5, the mushroom-shaped member 26 includes a foot 29 with a diameter that decreases from bottom to top and a cap 30 with a diameter that significantly exceeds its maximum diameter. In order to avoid concentration of stress on the connection zone, the foot section 29 and the cap section 30 are connected through a surface having a relatively large radius of curvature, and the connection zone is located above the plane of the lower surface of the cap section 30. It is better to do so.

As another type, the cap 30 of the mushroom-shaped member 26 is
may be square (FIGS. 9 to 13), and the foot 29 may be cylindrical (FIGS. 8, 9, and 11 to 13). The member may be a single member (FIGS. 5 and 10) or may be formed in two parts. In the latter case, the two parts can be assembled by welding or by embedding the ends of the legs 29 in the grooves (FIG. 12) or circular grooves (FIG. 13) in the cap 30. be. The mushroom-shaped member 26 is
Although it can be attached tightly to the bolt 28 (FIG. 5), it may also be attached with a gap provided (FIG. 8).
The foot 29 of the mushroom-shaped member 26 can be embedded in the sliding plate 24 (FIG. 8).

An axial bore is provided in the mushroom-shaped member 26 for passing the bolt 28 therethrough. The bolt 28 passes through the mushroom-shaped member 26 and the annular portion 12, and the bolt 28 penetrates the mushroom-shaped member 26 and the sliding plate regardless of the usage conditions, especially when the direction of the furnace body 10 is reversed and the tip end is downward. 24 or between the sliding plate 24 and the annular portion 12 by means of a nut 32 screwed onto the end of the bolt 28, sufficient to provide an initial stress without any gap between the slide plate 24 and the annular portion 12. It can be formed on the mushroom-shaped member 26 and the sliding plate 24.

The foot portion 29 of the mushroom-shaped member 26 is attached to the bracket 1.
6, and the cap 30 is located above the bottom plate 18. The through hole 34 provided in the bottom plate 18 for passing the foot 29 of the mushroom-shaped member 26 is rectangular, and the diameter of the foot 29 is adjusted so that the furnace body 10 can freely expand or deform with respect to the annular portion 12. It has a diameter much larger than that of the The through hole 34 may reach the outer edge of the bottom plate 18 of the bracket to form a notch. A distance j is provided between the cap 30 of the mushroom-shaped member 26 and the bottom plate 18 of the bracket 16 in the cooling state. In order to prevent the bottom plate 18 from being pinched between the cap 30 of the mushroom-shaped member 26 and the sliding plate 24, and to prevent movement relative to the annular portion 12, this gap is actually heated. Selected for complete absorption. The gap is
It is formed during assembly by using sliding plates 24 of appropriate thickness.

A projection 36 is welded to the bottom plate 18 of the bracket 16 and engages a notch 38 in the annular portion 12. The central plane of the protrusion 36 and the notch 38 is
It coincides with a plane XX containing the axes of the furnace body 10 and the journal 14, and their cooperating planes are parallel to said plane. In the cooled state, the protrusion 36
A gap is provided between the surfaces so that the notch 38 can freely slide within the notch 38. The weight of the protrusion 36 is never applied to the bottom of the notch 38, and any stress parallel to the axis of the furnace body 10 is transmitted by the protrusion 36 to the annulus 12. A much larger gap than previously described is provided between the bottom of the notch 38 and the opposing surface of the protrusion 36 so as to avoid the gap. The protrusion 36 is arranged on the plane XX
Only forces perpendicular to can be transmitted to the annulus 12.

When the furnace body 10 is in an inclined position or a horizontal position, 2
The protrusions 36 are formed on the plane X-
A portion of the force perpendicular to X is transmitted to the annulus 12. The other part of the vertical force is transmitted by two other projections 40, which are connected to the journal 14.
The notch 42 of the annular portion 12 cooperates with the notch 38 in the same way that the protrusion 36 cooperates with the notch 38 . A protrusion 40 is attached to a framework 44 fixed to the wall of the furnace body 10 with bolts so that it can be disassembled when the furnace body 10 is separated from the annular portion 12.
to weld. Brackets 16 and 44 are located on opposite sides of annulus 12. Like protrusion 36, protrusion 40 does not place any weight on the bottom of notch 36 and is capable of transmitting only stresses perpendicular to plane XX to annulus 12. In the cold, the bracket 44 can contact the annulus 12, but in the hot, the expansion of the furnace body 10, which is greater than the expansion of the annulus 12, creates a gap of several millimeters.

Two other brackets 46 with protrusions 48
is fixed to the furnace body 10 at two diametrically opposite locations, and in this case, the central plane of the protrusion 48 is a longitudinal section perpendicular to the plane XX that includes the axes of the furnace body 10 and the journal 14. When the furnace body 10 is vertical and the tip is upward, the bracket 46 is located above the annulus 12 and the protrusion 48 engages a notch 50 formed in the top surface of the annulus 12. The cooperating surfaces of the protrusion 48 and the notch 50 are perpendicular to the plane
Sufficient clearance is provided between the bottom of the notch 50 and the opposing surface of the protrusion 48 so that the protrusion 48 can transmit only stresses perpendicular to the axis of the notch 50 to the annular portion 12.
Essentially, the stress is caused by uneven expansion of the furnace body 10. Bracket 46 is far enough away from the top surface of annulus 12 that it never contacts annulus 12.

The projections 36, 40, 48 and the notches 38, 42, 50 that cooperate with them allow the annular portion 12 and the furnace body 10 to be held in alignment with their axes.

Naturally, all modifications that can be applied to the embodiments described above by using technically equivalent equipment do not depart from the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is an elevational view of a converter according to the present invention; FIG. 2 is a cross-sectional view of the converter taken along line 2--2 in FIG. 1;
FIG. 3 is a cross-sectional view of the converter in FIG. 1 taken along line 3--3, and FIG.
5 shows a detail of the fixing of the bracket on the annulus; FIG. 6 shows a view taken in the direction of arrow B; FIG. 7 is a partial sectional view of the converter shown in FIG. 1, with the cut plane encompassing the axes of the furnace body and journal; FIG. 9 is a sectional view taken along line 9--9 of the detailed view of FIG. 8, and FIGS. FIG. 3 is a cross-sectional view and a plan view showing various embodiments of a member for fixing a bracket on an annular portion. DESCRIPTION OF SYMBOLS 10... Furnace body, 12... Annular part, 14... Journal, 16... Bracket, 18... Bottom plate of bracket, 26... Mushroom-shaped member, 28... Bolt, 29...
Foot part, 30... Cap part, 34... Through hole, 36, 40, 4
8... Projection, 38, 42, 50... Notch.

Claims (1)

[Claims] 1 A furnace body 10 is supported by an annular portion 12 surrounding it, and is supported by two journals 14 provided on both sides across the diameter of the annular portion 12.
The furnace body 10 is made tiltable about a horizontal axis.
When the bracket 16 is in a vertical position with the mouth facing upward, the bottom plate 18 of the bracket 16 on the top surface of the annular portion 12 is inserted into the bolt 2.
8 and nuts 32, a mushroom-shaped member 26 consisting of a cap 30 and a foot 29 is connected to the bolt 28.
is integrated with the annular part 12 by the nut 32, and the foot part 29 of the mushroom-shaped member 26 is connected to the bottom plate 1.
8 of the through hole 34 of the bottom plate 18, and the through hole 3 of the bottom plate 18.
4 is larger than the diameter of the foot portion 29 of the cap portion 30.
The length of the foot portion 29 is made somewhat longer than the thickness of the bottom plate 18 to form the cap portion 3.
The steelmaking converter is characterized in that a small gap is provided between the lower surface of the bottom plate 18 and the upper surface of the bottom plate 18.