CN101579727B - Method of holding dummy rod in continuous casting plant and continuous casting plant with dummy bar - Google Patents

Abstract

The subject of the invention is a method for holding a dummy bar (4) in a slab guide (2) of a continuous casting plant during insertion and before the start of casting, wherein the dummy bar is The driven strand guide rollers ( 7d ) are conveyed and held by the adjustable strand guide rollers ( 7c ) in the starting position of the outlet-side closed cast mold. In order to reliably prevent the dummy bar from falling in the strand guide mechanism in the event of an operational failure, it is proposed that the strand guide segment (3 , 3a, 3b, 3c, 3d) the strand guide rollers (7b) are conically adjusted and block the delivery path (6) of the dummy bar (4). Furthermore, the invention relates to a continuous casting installation with a dummy bar (4) and a stop device (15) for the dummy bar (4).

Description

Method of holding dummy rod in continuous casting plant and continuous casting plant with dummy bar

technical field

The invention relates to a method for holding a dummy bar in a strand guide of a continuous casting plant during insertion and before the start of casting, wherein the dummy bar is transported by drivable strand guide rollers And it is held by adjustable strand guide rollers in the starting position of the exit-side closed continuous casting mold.

Furthermore, the invention relates to a continuous casting installation with a dummy bar.

Background technique

Before the casting process starts, the continuous casting mold is closed on the output side by means of the dummy rod head of the dummy rod. The dummy bar is transported from below or along the strand guide in an upward movement, mostly by means of adjustable and drivable strand guide rollers into the mould, and is held in the starting position by the strand guide rollers , or from the casting table to be transported from above through the continuous casting mold and then again held in the starting position in the strand guide by adjustable and drivable strand guide rollers.

Sudden pressure loss in the adjustment assembly of the adjustable strand guide rollers due to misuse or failure of the operating system leads to a sudden, continuous acceleration of the heavy dummy rod in the strand guide mechanism The downward movement, wherein, this movement continues on the output roller table of the continuous casting equipment until a farther distance. As a result, not only personal injuries but also damage to individual plant components can result. In this case, for reliability reasons, it is not permissible for an operator to remain in the hazardous area during the operating phase.

In order to avoid this failure, it is known from DE 19 53 094 A1 to arrange a locking device in the traversing path of the dummy bar. The dummy bar thus remains in the starting position until, with the start of the casting process, the dummy bar is moved by the driven and adjusted strand guide rollers through the strand guide at the desired casting speed. The locking device is located behind the straightening drive in the area of the delivery roller table of the continuous casting plant in the conveying direction of the continuous casting strand. This embodiment presupposes a very long dummy bar and is not suitable for short dummy bars or for the use of dummy bars of different lengths.

Usually the locking of the dummy bar in the starting position is effected by strand guide rollers which can be adjusted with a corresponding pressure and which are arranged distributed in the strand guide.

Contents of the invention

The object of the present invention is therefore to avoid the above-mentioned disadvantages of the prior art and to propose a method and a device for holding a dummy bar in a continuous casting plant in which the dummy bar is held in a The starting position and the holding of the dummy bar against an uncontrolled fall are realized by systems that are independent of each other. A further object of the invention is to hold the dummy bar without additional devices in the slab guide and to hold the dummy bar independently of its length, especially at very short Works in the dummy bar.

The object of the present invention is achieved starting from a method of the above-mentioned type in that the strand guide rollers of the strand guide segment following the strand end of the dummy bar in the direction of strand transport are conically adjusted and close the dummy ingot Rod delivery path.

The slab guiding segment includes two rows of slab guiding rollers. A row of continuous casting slab guide rollers is fixedly supported on the outer arc-shaped frame of the continuous casting slab guiding sector, and the second row of continuous casting slab guiding rollers is arranged in a continuous movement relative to the first row of continuous casting slab guiding rollers. The slab is guided on the inner arc frame of the segment. This relative mobility enables, for example, the adjustment of the desired slab thickness, the adjustment of the thickness reduction in cast slabs with, for example, a fluid core, and in the case of uncontrolled falls as other new applications from now on. Conveying path for dummy rods.

It is particularly advantageous if the strand guide rollers of the strand guide segment directly following the end of the dummy rod in the strand conveying direction are conically adjusted and the conveying path of the dummy rod is blocked. The conical adjustment of the strand guide rollers is selected in such a way that at least one strand guide roller protrudes into the conveying path of the dummy bar and stops the dummy bar in the event of a possible downward movement of the dummy bar. . For standard segment lengths, irrespective of the length of the inserted dummy bar, an uncontrolled downward movement of the dummy bar of approximately 1.5 m occurs in the worst case. Therefore, the impact force on the slab guide roller can be kept within its reliable load-bearing limit.

的引锭杆并且阻止进一步向下运动，该作用的冲击力能够被相对小地保持。If at least two of the conically adjusted slab guide rolls are intercepted at the end of the dummy bar with a tapered stop when the dummy bar suddenly loosens or falls

dummy bar and prevent further downward movement, the impact force of this action can be kept relatively small.

The object of the present invention is solved by a continuous casting plant according to the invention, which comprises a continuous casting mold and a continuous casting strand guide which follows in the conveying direction of the continuous casting strand and which is composed of multiple Formed by a strand guide segment with strand guide rollers, the continuous casting plant comprises a dummy bar which closes the continuous casting mold on the output side at the start of casting and which The slab guide mechanism is held and moved by adjustable and drivable slab guide rollers, wherein these slab guide rollers form the conveying path for the dummy bar, A blocking device for the spindle bar, the blocking device is configured to be displaceable and returnable from a release position located outside the conveying path to a blocking position blocking the conveying path of the dummy rod The end of the dummy rod oriented in the direction of strand transport has a conical stop surface; and the conically adjusted strand guide rollers of the individual strand guide segments form a section for the dummy rod. The baffle device and the conically adjusted slab guide rollers in the conveying path generate a tangential sectional surface to the outer surface of the roller, and when the end of the dummy bar hits the slab guide roller, the sectional surface space The inclination of corresponds to the spatial inclination of the retaining surface at the end of the dummy bar. The blocking device is therefore a device which temporarily protrudes into the conveying path of the dummy bar and automatically stops the dummy bar in the event of an uncontrolled downward movement.

Expediently, the stop device for the dummy bar is formed by the conically adjusted strand guide rollers of the strand guide segment, which in the stop position protrudes into the back of the dummy bar. in the conveying path.

Expediently, the dummy bar has a conical stop surface on its dummy bar end oriented in the conveying direction of the strand, and the conically adjusted projection of the individual strand guide segments into the conveying path The slab guide rollers form the stop for the dummy bar.

An advantageous load distribution is achieved when at least two conically adjusted strand guide rollers protruding into the conveying path form the stop for the dummy rod.

If the blocking device consists of two or more strand guiding rolls, the conically adjusted strand guiding rolls form a blocking surface tangential to the outer surface of the rolls and hit the strand guiding rolls at the end of the dummy bar When it is up, the inclination of the sectional surface in space corresponds to the inclination in space of the baffle surface on the end of the dummy bar. Thus, an even distribution of impact force is achieved. The retaining surface on the end of the dummy bar is arranged on the inner side of the arc and is opposite to the adjustable continuous casting slab guide roller on the inner side of the arc. The reaction forces on the strand guide rollers arranged on the outside of the arc are dissipated via the roller bearings on the segment frame and the equipment carrier.

Description of drawings

Other advantages and features of the invention are obtained from the following description of non-limiting embodiments, wherein, with reference to the accompanying drawings, it is shown below:

1 shows a longitudinal section through a continuous casting installation with an inserted dummy bar and strand guide rolls positioned in a resting state,

FIG. 2 shows a sectional view of a strand guide segment with a stop device according to the invention.

Detailed ways

FIG. 1 schematically shows an arc-shaped continuous casting installation in longitudinal section with the components essential to the invention. The arc-shaped continuous casting equipment includes a continuous casting mold 1 in which the strand is formed from molten metal during the casting process; and the arc-shaped continuous casting equipment includes a continuous casting mold 1 coupled The arc-shaped continuous casting strand guide mechanism 2, in which the continuous casting strand is continuously cooled, and is diverted from the substantially vertical casting direction to the horizontal conveying direction. The strand guiding mechanism 2 is formed by a row of strand guiding segments 3 , of which four strand guiding segments 3 a , 3 b , 3 c , 3 d are shown as a representative. The dummy bar 4 formed by the link chain is shown in its starting position, which is occupied by the dummy bar 4 at the start of casting, and in which it is The spindle head 4a protrudes into the continuous casting mold 1 and closes the continuous casting mold 1 on the delivery side. The dummy bar end 4b, which is formed by the last link of the chain of links, has a stop surface 5 which is inclined in the strand conveying direction R such that the dummy bar end runs wedge-shaped.

The conveying path 6 for the strand and for the dummy rod is formed by the strand guide mechanism 2 by two rows of strand guide rollers 7a and 7b which are assembled in groups It is supported in the strand guide segment 3 . As shown in detail in FIG. 2 , the arc-shaped outer slab guide roller 7 a is rotatably supported on the arc-shaped outer carrier frame 8 a and the arc-shaped inner slab guide roller 7 b is rotatably supported on the continuous casting On the carrying frame 8b of the arc inner side of blank guide segment 3. Some of the strand guide rolls 7a, 7b are configured as driven strand guide rolls 7c and/or as adjustable strand guide rolls 7d and determine the casting speed of the strand or the withdrawal of the dummy bar speed. The position of the arc-shaped inner carrier frame 7b relative to the arc-shaped outer carrier frame 7a can be adjusted not only with respect to the parallel distance but also with respect to Its inclined position is adjusted in the conveying direction R of the continuous cast slab. For each of the two adjustment devices 11 , one is located behind the other in the plane of the illustration. Each slab guide segment 3 is anchored on the equipment carrying platform 9 .

The adjusting device 11 is formed by a pressure medium cylinder and equipped with a displacement sensor 12 . The position signal of the displacement sensor determines the instantaneous position of the slab guide roller 7b on the outside of the arc relative to the slab guide roller 7a on the inside of the arc. Based on the default values supplied to the individual segment controllers 13 by the plant process calculator 14 , the actuating signals for the individual actuating devices 11 are generated and the corresponding positions of the individual actuating devices are actuated. The adjustment mechanism of the continuous casting slab guide roller 7b inside the arc is adjusted in position accordingly.

The positioning of the arc-shaped inner strand guide rollers 7b shown in FIG. 2 shows three strand guide rollers 7b protruding into the conveying path 6 of the dummy bar 4, which are thus blocked for In the delivery path of the dummy bar 4. The strand guide rollers 7 b protruding into the conveying path 6 form a catch 15 for the dummy rod 4 . The tangential surface 16 on the strand guide roller 7 b forms in the region of the conveying path 6 an imaginary stop surface 17 for the dummy bar 4 , which hits the stop surface 5 of the dummy bar 4 When it reaches the slab guide roller 7b, it covers with the retaining surface 5. Therefore, it is ensured that the impact load is distributed nearly evenly to the slab guide roll 7b which stops the dummy bar and its supporting mechanism. The radially acting reaction force is absorbed and dissipated by the arc-shaped outer strand guide roller 7a (which together form a roller pair in the strand guide mechanism) opposite the strand guide roller of the stop dummy bar.

When the dummy bar is inserted from above through the continuous casting mold into the strand guide along the dotted line in Fig. to proceed. During the continuous insertion process, the drive movement of the dummy bar trolley is transmitted to the driven and adjusted strand guide rolls, by means of which the dummy bar head is precisely positioned in the mould. . Consequently, at the latest with the start of the insertion process, the conveying path of the dummy rod in the strand guide is blocked by the retraction of the stopper, and this blockage is not removed again until casting begins. The length of the dummy bar determines the segment on which or by means of which the blocking of the conveying path takes place. Therefore, the possible fall height of the dummy bar is limited to a height that does not damage the equipment components.

When the dummy bar is lifted into the continuous casting mold from below through the continuous casting slab guiding mechanism along the dotted linear guiding mechanism in Fig. 1, after passing through a certain segment, the blocking device can be used to correspondingly Block delivery path. This enables progressive holding of the dummy bar during lifting. It may also be sufficient to hold the dummy rod accordingly by means of the retaining device only upon reaching the continuous casting mould.

List of reference signs

1 crystallizer

2 arc-shaped continuous casting slab guiding mechanism

3, 3a, ..., 3d continuous casting slab guide segment

4 dummy bars

4a dummy rod head

4b Dummy rod end

5 face

6 conveying path

7a, 7b continuous casting slab guide roller

7c Driven strand guide rollers

7d adjustable continuous casting slab guide roller

8a The bearing frame on the arc-shaped outer side of the continuous casting slab leading segment

8b The bearing frame on the inner side of the arc of the continuous casting slab leading segment

9 equipment carrying platform

11 Adjustment device on the guide segment of continuous casting slab

12 displacement sensor

13 segment controller

14 Equipment Process Calculator

15 blocking device

16 tangential planes

17 fictional cross-sections

R continuous casting slab conveying direction

Claims (6)

1. Method for holding a dummy bar (4) in a strand guide (2) of a continuous casting plant during insertion and before casting starts, wherein the dummy bar is driven by a drivable The strand guide rollers (7d) are conveyed and held in the starting position of the exit-side closed cast mold by the adjustable strand guide rollers (7c), characterized in that in the strand conveying direction (R) The strand guide rollers (7b) of the strand guide segments (3, 3a, 3b, 3c, 3d) following the dummy bar end (4b) are conically adjusted and block said dummy bar (4) The delivery path (6), At least two of the conically adjusted strand guide rolls (7b) catch on the dummy bar end (4b) when the dummy bar (4) suddenly loosens and falls The dummy bar (4) is provided with a conical stop surface (5) and is prevented from moving further downwards, wherein the strand guide rollers ( 7b) Generate a cut-off surface (17) tangent to the outer surface of the roll, when the end of the dummy bar (4b) collides with the continuous casting slab guide roll (7b), the cut-off surface (17) space The inclination on corresponds to the spatial inclination of the retaining surface (5) on the dummy bar end (4b). 2. The method according to claim 1, characterized in that the continuous casting strand guiding segment (3, 3a, 3b, 3c) directly following the end of the dummy rod (4b) in the conveying direction of the continuous casting strand , 3d) said strand guiding rolls (7b) are conically adjusted. 3. Continuous casting equipment, having a continuous casting crystallizer (1) and a continuous casting slab guiding mechanism (2) following the continuous casting slab conveying direction, the continuous casting slab guiding mechanism (2) is composed of a plurality of continuous casting slabs carrying The billet guide segments (3, 3a, 3b, 3c, 3d) of the billet guide rolls (7a, 7b) are formed; The continuous casting mold (1) is closed on the output side, and the dummy bar (4) can be guided in the continuous casting strand guiding mechanism (2) by adjustable and drivable strand guiding rollers ( 7c, 7d) holding and moving, wherein the strand guide rollers (7a, 7b) form the delivery path (6) for the dummy bar (4), characterized in that the strand A stop device (15) for the dummy bar (4) is arranged in the guide mechanism (2), the stop device (15) being designed to be released from a Position shifted and shifted back to the blocking position blocking said conveying path (6) of said dummy bar, The dummy bar (4) has a tapered retaining surface (5) on the dummy bar end (4b) of the dummy bar (4) oriented along the conveying direction of the continuous casting slab; and each continuous casting slab guides The conically adjusted strand guide rolls (7b) of the segments (3, 3a, 3b, 3c, 3d) form a stop (15) for said dummy bar (4), and The slab guiding rolls (7b) which are conically adjusted in the conveying path (6) create a tangential stop surface (17) to the outer surface of the rolls, colliding at the dummy bar end (4b) The spatial inclination of the stop surface (17) corresponds to the spatial inclination of the stop surface (5) on the dummy bar end (4b) when reaching the strand guide roller (7b). the tilt. 4. The continuous casting equipment according to claim 3, characterized in that the blocking device (15) for the dummy rod (4) is guided by the continuous casting slab sector (3, 3a, 3b, 3c, 3d) form the conically adjusted strand guide rolls (7b). 5. The continuous casting installation according to claim 3, characterized in that two conically adjusted strand guide rolls (7b) form the stop for the dummy bar (4) (15). 6. Continuous casting plant according to one of the preceding claims 3 to 5, characterized in that the retaining surface (5) on the dummy bar end (4b) is arranged arcuately inside and opposite The continuous casting slab guide roller (7b) on the inner side of the arc.

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