EP0501172A1 - Drive arrangement for an automatic lance changeover device - Google Patents

Abstract

The invention relates to a drive for an automatic lance changing device, e.g. is used in the production of steel after the inflation process. Such a lance changing device comprises two pivotable about a horizontal axis of rotation, the lance receiving hook (10, 10 '), means for the synchronous vertical displacement of these hooks (10, 10') relative to the lance slide and to the coupling head (8), means which, during this displacement, of the Hook on these cause a pivoting movement about the said axis of rotation, and means for measuring the load acting on each hook (10, 10 '), the latter being a function of the force with which the upper part of the lance is pressed against the coupling head by the hooks becomes. The drive of this invention is a lifting spindle system, by means of which a vertically displaceable suspension ring (6) for upper lance suspension hooks (10, 10 ') is driven. This lifting spindle system consists of at least two tie rods (16, 16 '), the upper extremities (24, 24') of which are provided with an external movement thread and at least two gear wheels, the hubs of which interact with the upper extremities (24, 24 ') corresponding internal thread are provided. These gear wheels are mounted axially / radially in a gear housing (18) which in turn rests on load cells (34, 34 '). The latter cause the lifting spindle drive to switch off automatically when a predetermined contact pressure is reached between the upper part of the lance (32) and a coupling head (8). <IMAGE>

Description

The invention relates to a drive for automatic lance changing devices, in particular for lances to be coupled and fastened to a vertically movable lance carrier sled in the steelmaking process, an coupling head on the lance carrier sled being supplied with the materials required for freshening, and optionally also a cooling fluid, and on the Coupling point between the coupling head and the upper part of the lance are transferred, and such a lance changing device has a lance receiving hook, which can be pivoted about a horizontal axis of rotation and is assigned to the lance slide, on both sides of the vertical axis of the lance carrier slide - coupling head, means for synchronously vertical displacement of these hooks relative to the slide and the coupling head, Means which, when the hooks are shifted, cause them to pivot about their axis of rotation, and means which act on each hook nd load to be measured, the latter function of the force with which the upper part of the lance is pressed against the coupling head by the hook.

An automatic lance changing device of the aforementioned type is described in detail in document LU-86985. In this lance changing device, which serves as a reference below, the drive takes place, that is to say the actuation of the coupling mechanism for gripping the upper part of the lance and pressing it against the coupling head by means of a drive motor with a reduction gear connected downstream, and then by means of a separate lifting spindle system for each of the two mentioned Hook. Although this automatic lance changing device works perfectly in every respect according to the document mentioned, it has various disadvantages of a practical nature on. Because of the two lifting spindle systems to be loaded synchronously, the reduction gear mentioned must have two outputs, so that no "catalog gear" is suitable for this gear, but only a correspondingly more expensive custom-made product.

Due to the separate arrangement of the gear and the spindle system, the construction is both relatively expensive and space-consuming. Finally, the arrangement of the engine and transmission proposed in the document mentioned is also unfavorable because it narrows the possibilities for the spatial design of the supply lines for the said fresh substances to the coupling head (see, for example, line 6 in FIG. 1 of the document mentioned, which is inevitable must be arranged running beneath the lance slide plate 10).

To avoid these disadvantages of the prior art, it is therefore an object of the invention to propose a drive of the type mentioned in the introduction, in which the system drive motor - reduction gear - lifting spindle system is optimally compact and inexpensive, a reduction gear in a special design is no longer required and is essential There is greater freedom for laying the supply lines to the coupling head.

This object is achieved by a drive of the type mentioned at the outset, characterized by a lifting spindle system, with the aid of which a vertically displaceable suspension ring for upper lance suspension hooks is driven, this lifting spindle system consisting of at least two tie rods, the upper extremities of which are provided with an external movement thread, at least two gear wheels, the hubs of which are provided with a corresponding internal thread for cooperation with the upper extremities, the gear wheels being axially / radially in a gear housing are mounted, which in turn rests on load cells for automatically switching off the lifting spindle drive when a predetermined contact force is reached between the upper part of the lance and a coupling head.

• Figur 1, eine Ansicht des prinzipiellen Aufbaus des erfindungsgemässen Antriebs mit Antriebsmotor, einem wahlweise ersten Untersetzungsgetriebe und einem zweiten, erfindungsgemässen Untersetzungsgetriebes mit integriertem Hubspindelsystem;
• Figur 1a, eine Seitenansicht von Links von Figur 1;
• Figur 2, eine Vorderansicht des zweiten Untersetzungsgetriebes;
• Figur 3, eine Draufsicht auf den Gegenstand nach Figur 2;
• Figur 4, eine Draufsicht auf den Gegenstand nach Figur 1.

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

• Figure 1 is a view of the basic structure of the drive according to the invention with a drive motor, an optional first reduction gear and a second reduction gear according to the invention with an integrated lifting spindle system;
• Figure 1a is a left side view of Figure 1;
• Figure 2 is a front view of the second reduction gear;
• Figure 3 is a plan view of the object of Figure 2;
• FIG. 4 shows a top view of the object according to FIG. 1.

For the first part of the description which now follows, it is advantageous to consider FIGS. 1 to 3 simultaneously.

In FIG. 1, 6 is a vertically displaceable support ring (corresponding to support ring 36 in the reference document), which is guided on a coupling head 8 and on which lance receiving hooks 10, 10 '(corresponding to hooks 16, 16' in said document) are pivotably suspended. The pivotal movement is generated when the ring 6 is displaced by connecting rods 12, 12 ', which are pivotally suspended with their upper extremities at fixed lugs 14, 14' integral with the coupling head 8. For the functioning of this suspension system, refer to the document mentioned.

The axial displacement of the ring 6 takes place according to the invention with the aid of two tie rods 16, 16 ', which extend into a gear housing 18 and interact there with worm wheels 20, 20', these parts forming a spindle system 22, 22 'with an external thread on the upper ones Extremities 24, 24 'of the tie rods 16, 16' and internal threads in the bores of the worm wheels 20, 20 '. The systems tie rods / worm wheels accordingly form a lifting spindle system with an effect analogous to that of the systems 43 in the document mentioned.

The drive of the two worm gears 20, 20 ', which are supported axially / radially on the housing 18 with their hubs, preferably by means of two tapered roller bearings (not shown), takes place synchronously by means of a shaft 25 passing through here, or by means of shafts connected by coupling, on which the the worms 26, 26 'assigned to the worm wheels are arranged.

In FIG. 1, the drive system according to the invention for the automatic lance changing device is accomplished by means of an electric motor 28 with an angular gear 30 connected downstream. In this way, a quite compact and optimally adaptable drive block is created, since the motor 28 can be mounted at any angle with respect to the shaft 25. Insofar as the available space permits, this electric motor 28 can of course also be flanged to the transmission housing 18 directly or via a so-called lantern.

A hydraulic or pneumatic system can of course also be used as the drive source instead of the electric motor 28 shown for illustration.

Similar to the device according to the cited document, the lifting spindle drive is also stopped in the system according to the invention when a predetermined contact pressure of the upper part of the lance 32 against the coupling head 8 is reached. For this purpose, the lifting spindle gear housing 18 is supported on two load cells 34, 34 ', which switch off the drive motor when this contact force is reached.

Finally, the top view according to FIG. 4 illustrates particularly clearly how much the access to the coupling head 8 is now made easier compared to the embodiment according to the above-mentioned document, with a corresponding simplification of the laying of the said fresh material line system 40.

In the above description, the lifting spindle drive was designed as a worm gear for the sake of illustration. It goes without saying that any other mechanical drive can be used in which the two lifting spindles are driven synchronously, e.g. a chain wheel drive with the ratio 1: 1 between the two spindles.

Claims (11)

Drive for automatic lance changing devices, in particular for lances to be coupled and fastened to a vertically displaceable lance carrier sled in the steelmaking process, with a coupling head on the lance carrier sled being supplied with the materials required for freshening and possibly also a cooling fluid and at the coupling point between Coupling head and upper part of the lance are transferred into the latter, and such a lance changing device has a lance receiving hook, which can be pivoted about a horizontal axis of rotation and is assigned to the lance slide, on both sides of the vertical axis of the lance carrier slide coupling head, means for synchronously vertical displacement of these hooks relative to the slide and for the coupling head, means, which, when these hooks are displaced, cause them to pivot about their axis of rotation, as well as means for measuring the load acting on each hook The latter is a function of the force with which the upper part of the lance is pressed against the coupling head by the hooks, characterized by a lifting spindle system with the aid of which a vertically displaceable suspension ring (6) for upper part of the lance - suspension hooks (10, 10 ') is driven, whereby this lifting spindle system consists of at least two tie rods (16, 16 '), the upper extremities (24, 24') of which are provided with an external movement thread and at least two gear wheels (20, 20 '), the hubs of which interact with the upper extremities (24 , 24 ') are provided with a corresponding internal movement thread, said gear wheels (20, 20') being mounted axially / radially in a gear housing (18) which in turn rests on load cells (34, 34 ') for the automatic shutdown of the lifting spindle drive when Reaching a predetermined contact force between the upper part of the lance (32) and a coupling head (8). Drive according to claim 1, characterized in that the gear wheels (20, 20 ') are worm wheels. Drive according to claim 2, characterized in that the drive worms (26, 26 ') assigned to the worm wheels (20, 20') are arranged on a common, continuous shaft (25) and drive these wheels (20, 20 ') synchronously. Drive according to claim 2, characterized in that the worm wheels are each mounted on an individual shaft, which are coupled directly to one another. Drive according to claims 1 and 3, characterized in that the lifting spindle drive acting on the shaft (25) is optionally a pneumatic hydraulic or electrical drive. Drive according to claim 5, characterized in that the lifting spindle drive consists of an electric motor (28) with a downstream transmission. Drive according to claim 1, characterized in that the gear wheels (20, 20 ') are any wheels which ensure a synchronous drive of the lifting spindle system. Drive according to claim 7, characterized in that the gear wheels (20, 20 ') are chain wheels which are driven by a common chain. Drive according to claim 7, characterized in that the gear wheels (20, 20 ') are bevel gears which are driven by a common bevel gear shaft. Drive according to claim 7, characterized in that the gear wheels (20, 20 ') are screw wheels which are driven by a common screw wheel shaft. Drive according to claim 7, characterized in that the gear wheels (20, 20 ') are toothed belt wheels which are driven by a common toothed belt.

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