EP0126260B1 - Compact swinging mechanism with a large swinging arc for a shaft furnace plugging gun - Google Patents

Abstract

A shaft furnace plugging apparatus is presented which occupies very little space and sweeps out a relatively low and comparatively flat continuous trajectory between an inoperative position and an operative position. The plugging apparatus includes a clay gun pivotably mounted on a first end of a jib, the jib being rotatable about a support column. The apparatus also includes a pair of hydraulic cylinders, the first hydraulic cylinder being pivotably attached between a second end of the jib and an intermediate pivotable frame and the second hydraulic cylinder which is operative between the intermediate pivotable frame and a fixed support frame.

Description

The invention relates to a compact shaft furnace stuffing gun drive for large swivel angles, which is arranged on a cantilever and can be swiveled around a support column such that it describes an essentially low-flat, continuous path when swiveling from a rest position into a working position and vice versa.

Hydraulic cylinders are usually used for pivoting the boom, which according to the prior art basically produce the pivoting movement in two arrangements, depending on the desired pivoting angle.

If this swivel angle is not greater than 120 °, at most 130 °, it is sufficient to let the hydraulic cylinder act between a fixed point and a pivot point on the boom. With such an arrangement, a theoretical swivel angle of almost 180 ° could be generated, however, the contact pressure of the stuffing gun mouthpiece against the tap hole to be closed can no longer be applied sufficiently large. With this arrangement, therefore, the swivel angle is usually limited to ± 90 °. The advantage of this arrangement is the simple structure, but because of the relatively small pivoting angle, the stuffing gun cannot be removed from the tapping channel as far as would be desirable due to the high temperatures prevailing during the tapping process seen disturbing.

If the swivel angle is to be larger, a lever system can be provided between a fixed point and a pivot point on the boom, on which the hydraulic cylinder engages and by means of its kinematics the movement amplitude of the cylinder is reflected in an enlarged swivel angle. In this way, swivel angles of 180 ° and more can be achieved with a sufficiently large pressing force of the stuffing gun mouthpiece against the tap hole.

Advantageous embodiments of these two embodiments of stuffing gun swivel drives are described in more detail in German patent DE-2157712.

Although the swivel drives described in the cited patent specification meet all requirements, in particular also with regard to their space requirement, in most cases, there are nevertheless applications in which further optimization is desirable with regard to space requirements. In particular, particular emphasis is placed on the largest possible space between the tamping machine swivel drive and the blast furnace, or a compact swivel drive is intended to make it possible to place the tamping machine system closer to the blast furnace.

It is therefore an object of the invention, starting from a stuffing gun swivel drive of the type mentioned at the outset, to propose such a device which enables a boom swivel angle of 180 ° and more with minimal space requirement and expenditure on mechanical means.

This object is achieved by a stuffing gun swivel drive of the type mentioned by the features stated in the characterizing part of the main claim.

• Figur 1 eine Draufsicht auf den Hochofenabstichlochbereich mit einer Stichlochstopfmaschine, welche zum Schwenken des Auslegerarms für die Stopfkanone mit zwei Hydraulikzylindern versehen ist ;
• Figuren 2 und 3 in vergrössertem Masstab Einzelheiten der Figur 1 im Längsschnitt ;
• Figur 4 wie Figur 1, jedoch mit einem ersten der beiden Hydraulikzylinder in ausgefahrener Stellung ;
• Figur 5 wie Figur 4, jedoch mit dem zweiten der beiden Zylinder ebenfalls in ausgefahrener Stellung ;
• Figur 6 eine Ausführungsvariante nach Figur 1 mit veränderter gegenseitiger Anordnung der beiden Zylinder ;
• Figur 7 wie Figur 6, jedoch mit einem ersten der beiden Zylinder in ausgefahrener Stellung ;
• Figur 8 wie Figur 7, jedoch mit dem zweiten der beiden Zylinder ebenfalls in ausgefahrener Stellung.

Exemplary embodiments of the invention are shown in the drawings, in which the same parts are provided with the same reference numbers, and are described in more detail below. Show it :

• Figure 1 is a plan view of the blast furnace tap hole area with a tap hole tamping machine which is provided with two hydraulic cylinders for pivoting the cantilever arm for the stuffing gun;
• Figures 2 and 3 on an enlarged scale details of Figure 1 in longitudinal section;
• Figure 4 as Figure 1, but with a first of the two hydraulic cylinders in the extended position;
• Figure 5 as Figure 4, but with the second of the two cylinders also in the extended position;
• FIG. 6 shows an embodiment variant according to FIG. 1 with a modified mutual arrangement of the two cylinders;
• Figure 7 as Figure 6, but with a first of the two cylinders in the extended position;
• Figure 8 as Figure 7, but with the second of the two cylinders also in the extended position.

FIG. 1 shows a taphole tamping machine system 10 with a tamping cannon 12 which is suspended on a pivotable cantilever arm 14. The latter is rotatably mounted on a support column 16 (FIG. 2), preferably inclined to the vertical (not shown), for example by means of a roller bearing 18, 20. To ensure that in particular in the two end positions, the stuffing gun 12, H. In its rest or in its working position, which forms a predetermined angle with the extension arm 14, a guide rod 22 is shown symbolically by a dash-dot line, which is articulated on the one hand on the stuffing gun 12 and on the other hand at a fixed point 24. Details about the kinematics this mutual arrangement of boom and guide rod 22 can be found in the above-mentioned patent.

According to the invention, two, preferably identical, hydraulic cylinders 26 and 28 are provided for pivoting the extension arm 14. The first hydraulic cylinder 26 acts between a fixed point 30 and a pivotable about the axis 32 of the support column 16 formed from two parallel steel plates 34, 36 Frame 38. The fixed point 30 is the end point of a cantilever double arm 40, which projects between the two steel plates 34, 36 and is attached to a column 42, which in turn is anchored to a common foundation frame 44 for the support column 16 and this column 42. FIG. 3 is to be understood as that part of FIG. 2 which lies behind the hydraulic cylinder 26, but the piston rod end 46 is shown rotated by approximately 90 ° around the fixed point 30. The second hydraulic cylinder 28 in turn acts between the frame 38, between the two parallel plates 34, 36 of which it is arranged, like the first cylinder 26, and a pivot point 48 on the extension arm 14.

As a result of this arrangement of the two cylinders 26 and 28, the frame 38 together with the second cylinder 28 and extension arm 14 (with stuffing gun 12) can be pivoted through a certain angle by actuating the first cylinder 26, and the extension arm 14 by actuating the second cylinder 28 (with stuffing cannon 12) by a further, certain angle with respect to the frame 38. The frame 38 thus has a function like a gear and is therefore referred to below as a gear frame.

In and of itself, it is irrelevant whether both cylinders extend or retract at the same time or in succession, since the end position of the stuffing gun is the same in both cases. Therefore, both cylinders are preferably acted upon in parallel with hydraulic fluid, so that the hydraulic circuitry is limited to a minimum. However, if for some reason a certain working order of the two cylinders is sought, this can be achieved by quite simple means, e.g. B. by making the bearing frictional resistances, which must be overcome by the individual cylinders when swiveling, of different sizes. From Figure 2 z. B. can be seen that the cantilever arm 14 is supported on a roller sleeve 50 on the support column 16, while the bearing between this sleeve 50 and the countershaft 38 is a sliding bearing. In this case, the cylinder that only has to overcome the rolling bearing resistances, and that is cylinder 26, is extended first. The bearing between the countershaft frame 38 and the sleeve 50 can of course also be designed as a roller bearing. In this case, the bearing friction resistance is approximately the same for both cylinders. If, however, a certain working sequence of the cylinders is to be maintained, a throttle need only be provided on the supply line for the cylinder to be extended last. These simple measures make it possible to use identical, i.e. H. cylinders advantageous for warehousing to realize a desired work order.

In Figure 4 z. B. the second cylinder 28 first and then the first cylinder 26, whereby the working position of the stuffing gun is reached in Figure 5.

FIGS. 6, 7 and 8 show an embodiment variant of the proposed swivel drive with two preferably identical hydraulic cylinders and a countershaft frame. Here, too, a first hydraulic cylinder 126 acts between a fixed point 130 and a counter frame 138, while a second hydraulic cylinder 128 acts between the counter frame 138 and the extension arm 114. The difference between this and the first described embodiment is essentially that the first hydraulic cylinder 126 is arranged approximately parallel to the elongated configuration of the countershaft 138, and the second hydraulic cylinder 128 approximately parallel to the extension arm 114, while in the embodiment according to FIGS. 4 and 5, the hydraulic cylinders 26, 28 and the countershaft frame 36 are arranged axially symmetrically to one another, i. H. that the cylinders 26 and 28 are arranged substantially symmetrically to the center line 31 (FIG. 1) of the countershaft 38. The mode of operation in the embodiment according to FIGS. 6, 7 and 8 remains the same as in the first case, i. H. Both cylinders are preferably acted upon in parallel with hydraulic fluid and extend and retract either simultaneously or, as described above, in a specific sequence. Figure 7 shows z. B, the stuffing gun position after extension of the first hydraulic cylinder 126, while Figure shows the stuffing gun 112 in the working position, i. H. after extending the two hydraulic cylinders 126 and 128.

With this design variant, too, the small space requirement for a 180 ° swivel drive is striking. It should be noted that in the case of the swivel drives shown in the figures, a swivel angle of approximately 150 ° (compare, for example, FIGS. 1 and 5) has been sufficient, but this angle can be increased to 180 ° and more.

The two plates 34 and 36 are rigidly connected to one another by suitable means. These funds can e.g. B. be spacers with which these plates are screwed, for example (indicated by 33 in Figure 1).

As noted above, the support column 16 (Figure 2) is preferably inclined to the vertical. More about the advantages of this arrangement and also an advantageous suspension of the stuffing gun 12 on the boom 14 can be found in DE-PS 2840181.

Claims (6)

1. Compact swinging mechanism with a large swinging arc for a shaft furnace plugging gun mounted on a jib (14, 114) and pivotable about a support column (16, 116) in such a way that when pivoted from an idle position into an operating position and vice versa it describes a continuous traject of which the main part is low down and comparatively flat, characterized by a first hydraulic cylinder (26, 126) which is operative between a fixed point (30, 130) and an intermediate frame (38, 138) pivotably about the support column (16, 116) and a second hydraulic cylinder (28.128) which is operative between the pivotable intermediate frame (38, 138) and the jib (14, 114).

2. Mechanism in accordance with claim 1, characterized in that the intermediate frame (38, 138) mainly consists of two parallel steel plates (34, 134, 36, 136) situated one above the other, and wherein the hydraulic cylinders (26, 126, 28, 128) extend inwards between these steel plates (34. 134. 36. 136), each cylinder being articulated thereto by one of its fulcrums.

3. Mechanism in accordance with claim 1 or 2, wherein the intermediate frame (38, 138) is rotatably mounted on a rotary sleeve (50) for the jib (14, 114).

4. Mechanism in accordance with claim 1 or 2, wherein the first hydraulic cylinder (126) is substantially parallel to the elongated intermediate frame (138) while the second hydraulic cylinder (128) is substantially parallel to the jib (114).

5. Mechanism in accordance with claim 1 or 2, wherein the hydraulic cylinders (26, 28) are axially symmetrical (31) to the intermediate frame (38).

6. Mechanism in accordance with claim 2, wherein the steel plates (34. 36, 134, 136) are rigidly interconnected by means of spacers (33, 133).

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