KR101757634B1 - Method for securing a start-up strand in a continuous casting installation and continuous casting installation having a start-up strand - Google Patents

Abstract

The present invention relates to a method for securing a starting strand in a strand guide of a continuous casting plant, and to a continuous casting installation comprising a starting strand. It is an object of the present invention to specify a method and a continuous casting facility in which the starting strands are held and fixed by independent systems in preparation for uncontrolled crushing, The starting strand is fixed. Further, the starting strand must be fixed regardless of the weight of the starting strand. Characterized in that the starting strand (4) is fixed by means of one or more locking devices (8, 8a, 8b, 8c) arranged downstream in the strand conveying direction (R) when the starting strand (4) By doing so; Then, by opening and closing the conveying path 6 formed by the strand guide rollers 7a, 7b, 7c and 7d, the starting strand 4 is fixed and released by using the locking devices 8, 8a, 8b and 8c By doing so; The above goal is achieved by a method of the type mentioned in the introduction.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a continuous casting installation comprising a starting strand and a method for securing the starting strand in a continuous casting installation,

The present invention relates to a continuous casting installation comprising a starting strand and a method for securing a start-up strand in a strand guide of a continuous casting plant.

In particular, the present invention relates to a method for securing a starting strand in a strand guide of a continuous casting plant comprising a plurality of strand guide rollers,

The starting strand is transported by driveable strand guide rollers when the starting strand is fitted on the output side towards a starting position for closing the mold;

The starting strands are held in a starting position which closes the mold on the output side by means of settable strand guide rollers before the start of casting; And

- With the driveable strand guide rollers, the starting strand and the cast strand formed after the start of casting are drawn out.

The present invention also relates to a continuous casting installation comprising a mold and a strand guide, said strand guide following a strand conveying direction, said continuous casting installation comprising a starting strand closing the mold on the output side during the start of the casting , The starting strand can be held and moved within the strand guide by driveable and settable strand guide rollers and the strand guide rollers form a transport path for the starting strand.

Prior to the start of the casting operation, the mold is closed on the output side by the head portion of the starting strand. The starting strand is precisely conveyed into the mold from below to above along the strand guide using normally settable and drivable strand guide rollers so that it can be held or set by the strand guide rollers at this starting position, Are sequentially held in the starting position in the strand guide after they have been proceeded from the cast platform through the mold from above by possible strand guide rollers.

An operating error or failure in an electrical device, a hydraulic device, a pneumatic device or a communication device - settable and drivable strand guide rollers - causes an abrupt, continuously accelerating downward movement of heavy starting strands in the strand guide This movement, known as crashing, can generally occur over a large distance (e.g., in a plurality of strand guide segments and / or driving-roller stands) ). Since the vertical continuous casting installations have vertical strand guides, this risk is particularly high for these types of installations. When the starting strand is crushed, it is possible for people to suffer damage and to damage each component of the plant. Therefore, for safety reasons, it is not permissible for work staff to stay in hazardous areas during these work steps.

In order to prevent this harm, it is already known from DE 19 53 094 A1 to arrange a locking device which is frictionally engaged in the conveying path of the starting strand in the case of bow-type continuous casting installations. Thereby, at the start of the casting process, the starting strand is driven by clamping until the starting strand is moved through the strand guide at the desired casting speed, by the driveable and settable strand guide rollers Position. The locking device is located downstream of the straightener in the strand transport direction and in the region of the run-out roller table of the continuous casting installation. The above-described embodiments assume that the starting strand is very long and are not suitable for use with short starting strands or starting strands of different lengths. Clamping also makes the use of this embodiment for heavy starting strands problematic.

It is an object of the present invention to propose a continuous casting installation comprising a starting strand, a method for securing the starting strand in a continuous casting installation, avoiding the disadvantages of the prior art described above,

By means of independent systems the starting strands are held and fixed against uncontrolled crushing; And

The starting strand is fixed in the strand guide in preparation for uncontrolled crushing by a separate element which is independent of the continuous casting operation.

A further object of the present invention is to make it possible to fix the starting strand both when the starting strand is being fitted, when held at the starting position, and after the start of casting. Furthermore, the fixation of the starting strands should be substantially independent of the weight of the starting strands, and in particular also in the case of very heavy starting strands.

The above object is achieved from the method of the type described in the introduction,

The starting strand is fixed by one or more locking devices arranged downstream in the strand transport direction when the starting strand is being fitted and held; And

By opening and closing the transport path formed by the strand guide rollers using a locking device, the starting strand is fixed and released.

According to the method according to the invention, the starting strands are transported by strand guide rollers drivable in the direction of the mold in the strand guide when the starting strand is being fitted, and before the commencement of the casting, The starting strands are held by strand guide rollers which can be set at a starting position for closing the mold on the side. To protect the starting strands from crushing, when the starting strands are being fitted and held, the starting strands are fixed by means of one or more locking devices arranged downstream in the strand conveying direction, that is to say the one or more locking devices Thus, movement of the starting strand in the strand transport direction is blocked. As a result, the starting strands are fixed against uncontrolled crushing both when the starting strand is being inserted, when it is held, and when it is being discharged. By opening and closing the transport path formed by the strand guide rollers using the locking device, the starting strand is fixed and released, thereby fixing the starting strand in a manner substantially independent of the weight of the starting strand.

In a preferred embodiment, after the start of casting, a plurality of locking devices are dispensed sequentially to a strand guide (e.g. comprising one or more strand guide segments or drive roller stands) And a plurality of locking devices are fixed when released. When the starting strand is being fitted, the sequential fixation, i. E., Blocking, is made opposite to the strand transport direction, but the sequential release, i.e. unblocking, In the strand transport direction. As a result of the sequential release of the locking devices, the casting operation proceeds without interruption by the fixing of the starting strands. Furthermore, by means of a plurality of locking devices distributed in the strand guide, the starting strands can be fixed in a manner substantially independent of the length of the starting strands, so that very short starting strands can be fixed. By means of a plurality of locking devices, the distance at which the crushing takes place also decreases until the starting strand is trapped in the strand guide, thereby increasing safety.

In a preferred embodiment, if the electrical device, the hydraulic device, the pneumatic device or the communication device fails, the locking device automatically locks the starting strand. As a result, the safety is increased when the starting strand is being fitted, held, and disengaged.

In another preferred embodiment, the starting strands are automatically fixed without external energy, i.e. without energy from outside the locking device. As a result, safety is further increased when the starting strand is being fitted, held, and un-fitted.

If the starter strand is suddenly disconnected and crushed, the starter strand is trapped by a locking device disposed downstream in the strand transport direction and prevents further downward movement. This ensures that any components (especially segments or settable rollers) that are important for the job are not damaged if crushing occurs.

As soon as possible, in order to enable the implementation of the method according to the invention to achieve the object on which the invention is based, one or more locking devices for the starting strands are arranged in the strand guide, and from a release position situated outside the transport path It is desirable that one or more locking devices are designed to be reciprocally displaceable into a blocking position for blocking the transport path of the starting strand. By using such a mechanism, the starting strands are fixed by fitting so that high operational safety is achieved even for very large weight starting strands.

In order to achieve the advantages according to the invention, it is not meaningful that the continuous casting plant has a vertical form or a warp-type form, and that the continuous casting plant comprises blooms, billets, It is also not meaningful to be formed for the production of beam blanks or slabs.

Furthermore, it is not important that the starting strand has the form of a link chain or that it has a rigid form, or that it has a straight or curved form.

In a preferred embodiment, a locking device is disposed on the front side of the strand guide segment or on the front side of the drive-roller stand, or between two strand guide rollers adjacent in the strand transport direction, Between the rollers, a locking device is disposed. As a result, a force is preferably applied to fix or trap the starting strand into the strand guide segment through the locking device or into the driving-roller stand.

Alternatively, the locking device may be disposed within a separate support structure. This embodiment makes it possible to assemble or disassemble the locking device irrespective of strand guide segments or drive-roller stands.

A simple embodiment consists of forming a locking device as a displaceable or rotatable pin, said pin being designed to be displaceable by an actuating apparatus. It is particularly preferred to form the pin and actuating device with the subassembly, such as a cassette, so that the subassembly can be assembled and disassembled simply and quickly.

Another embodiment consists in forming a locking device with a tilted pin, which can be displaced into an inclined plate or displaceable, wherein the dead load of the locking device defines a basic position of the locking device, The locking device can be displaced into the release position via the locking mechanism. This ensures that, if the actuating device fails, the locking device automatically locks the starting strand.

Another embodiment is to use a pressure accumulator which defines the basic position of the locking device using an actuating device in the form of a pressure-medium cylinder, for example a hydraulic pressure accumulator or a pneumatic pressure accumulator , And an actuating device. This ensures that, if the actuating device fails, the locking device automatically locks the starting strand.

Another embodiment consists in the fact that the actuating device comprises a spring, the force of which defines the basic position of the locking device. This ensures that, if the actuating device fails, the locking device automatically locks the starting strand.

In another preferred embodiment, the starting strand comprises a recess, preferably a slot or U-shaped recess, the recess being transversely laid over the transport path, The starting strand is fixed through the displaceable pin which engages into the recess.

An alternative embodiment consists of the fact that the locking device is in the form of a displaceable or rotatable plate, which is designed to be displaceable by an actuating mechanism.

Additional advantages and technical features of the present invention will become apparent from the following description of non-limiting exemplary embodiments in which the following figures are referred to:
Figure 1 is a schematic view of securing when the starting strand is threaded into a vertical continuous casting installation comprising strand guide segments,
Fig. 2 is a schematic view of securing the starting strand when it is being held and withdrawn;
Figure 3 is a perspective view of a strand guide segment including a locking device for securing the starting strand;
Figure 4 is a schematic view of securing when the starting strand is being inserted into a vertical continuous casting installation including a drive-roller stand, and
5 is a schematic view of a part of a strand guide of a vertical continuous casting plant with a locking device.

Figure 1 schematically shows a longitudinal section of a vertical continuous casting plant comprising components essential to the present invention. The installation comprises a mold 1 in which a cast strand of molten steel is formed during the casting operation and an adjacent vertical strand guide 2 in which the cast strand is continuously cooled and guided and supported . Strand guides 2 are formed by a series of strand guide segments, which are typically shown with four strand guide segments 3a, 3b, 3c, 3d. The starting strand 4 and the cast strand 5 are joined together by means of two strand guide rollers 7a and 7b which are joined in groups and mounted in strand guide segments 3a, 3b, 3c and 3d, A transport path 6 through the strand guide 2 is formed. The first row 7a of strand guide rollers is supported in a fixed position on the outer side of the strand guide segment 3 and the second row 7b of strand guide rollers is in a first row 7a of strand guide rollers, On the inner side of the strand guide segment (3). In one example, this relative mobility makes it possible to adjust the strand thickness to a predetermined strand thickness, or to achieve a reduction in the strand thickness in the case of a cast strand comprising, for example, a still liquid core. As shown in more detail in FIG. 3, the inner and outer strand guide rollers 7a, 7b are rotatably supported within a supporting frame. Some of the strand guide rollers 7a and 7b have the form of driveable strand guide rollers 7c and / or the shape of settable strand guide rollers 7d and the speed of the cast strand 5 Or the extraction rate of the starting strand (4). In order to close the mold 1 on the output side before the start of casting by the continuous casting plant, the starting strand 4 is fitted from below into the strand guide 2. [ To secure the starting strand 4, the strand guide segments 3b, 3c and 3d comprise locking devices 8a, 8b and 8c, respectively. The different steps that occur when the starting strand 2 is sandwiched are indicated by reference numerals 1 to 4 in Fig.

In step 1, a continuous casting installation at the start of the drawing operation (threading-in operation) is shown. Here, all of the locking devices 8a, 8b, 8c are opened and the starting strand 4 is inserted from below into the strand guide segment 3d so that the strand guide rollers 7c , 7d), the starting strand (4) is moved along the strand conveying direction (R).

In step 2, the starting strand 4 is fixed in preparation for crashing due to the fact that the starting strand 4 has already passed the strand guide segment 3d and the locking device 8c has been closed. Then, the starting strand 4 is again moved forward by using the driveable and / or settable strand guide rollers 7c and 7d, and the starting strand 4 is again moved forward by using the locking device (8b of step 3, 8a of step 4) The starting strand 4 is fixed.

In step 4, the head of the starting strand 4 closes the mold 1 on the output side due to the fact that the starting strand 4 has reached the starting position for starting the casting.

In one embodiment, which is not shown, the starting strands can be fitted (top feeding) from the top, of course, from the casting platform, through the mold into the strand guide. In this case, the starting strand is introduced through the mold and lowered onto the blocking locking device by means of a starting strand trolley which is normally movable on a casting platform or on a crane. The crane then moves away from the starting strand so that any erroneous work is blocked. Furthermore, the driveable and / or settable strand guide rollers are set, the starting strand is correctly positioned in the strand guide, and the locking device is blocked in turn. In this embodiment as well, depending on the length of the starting strand, it is advantageous to keep one or more locking devices closed when the starting strand is sandwiched, thereby fixing the starting strand.

Fig. 2 shows holding the starting strand 4 and withdrawing the starting strand 4 from the mold 1 with the cast strand 5. Fig. In step 1, the starting strand 4 is held by the driveable and / or settable strand guide rollers and the starting strand 4 is fixed by the locking device 8a. After the start of the casting, the locking strand 4 is released with the casting strand 5 being formed, that is, unblocked, from the mold 1 in the strand conveying direction R, do. To this end, the sequential arrangement of the locking devices 8a, 8b, 8c of the strand guide segments 3b, 3c, 3d is subsequently released in succession so that the starting strand 4 and the casting strand 5 Is fixed.

Fig. 3 shows the strand guide segment 3 of the strand guide 2 of the vertical continuous casting plant. The strand guide segment 3 essentially comprises a support frame 12, outer and inner strand guide rollers 7a and 7b and a locking device 8, And the actuating device 11 is designed such that the plate 9 can be transferred onto the upper front side of the strand guide segment 3 and the actuating device 11 comprises a pressure- pressure-medium cylinder. The strand guide roller 7c located on the outer side and disposed at the bottom in the strand transport direction R has the form of a driveable strand guide roller. Likewise, the strand guide rollers 7d located at the bottom but on the inner side are in the form of strand guide rollers, which can be set using a hydraulic cylinder shaped adjustment device 13. [ As a result, the strand guide rollers 7b and 7d in the support frame 12 are designed to be movable relative to the strand guide rollers 7a and 7c so that the rollers can move in the starting strand 4 or in the cast strand 5 and it is possible that the thickness of the cast strand 5 is reduced. When the starting strand 4 is fixed, the actuating device 11 is used to move from the release position located outside the transport path 6 to the blocking position for blocking the transport path 6, 8 is moved. If the hydraulic device, the electrical device or the communication device fails, the pressure-medium cylinder (not shown) of the actuating device 11 is moved so that the plate 10 is automatically moved to the starting position, (Not shown), which defines the starting position of the plate 10 on the transport path 6.

Figure 4 is a schematic view of the operation for fitting the starter strand 4 into the strand guide 2 formed from the drive-roller stand. In step 1, the mold 1 is inserted into the strand guide 2 from the top (upper feed), or from the bottom using the settable and driveable strand guide rollers 7c and 7d, respectively, The starting strand 4 is seated on a blocking locking device 8c in the form of a pin. In step 2, the settable and driveable strand guide rollers 7c and 7d are set, if appropriate the crane is taken away, the locking device 8c is unlocked and the starting strand 4 is correctly positioned . In step 3, the starting strand 4 reaches the target position (see the starting position at the top), and a locking device 8c in the form of a pin using an actuating mechanism (not shown) Lt; / RTI > In step 4, this causes the starting strand 4 to be completely fixed in the starting position.

Fig. 5 shows a part of the strand guide 2 of the vertical continuous casting plant. In this case, by means of the settable and drivable strand guide rollers 7c and 7d, the inserted starting strand 4 is held and the starting strand 4 is held by the locking device 8 in the form of a pin, Is fixed as soon as the starting strand (4) reaches the starting position. The actuating mechanism for the locking device 8 is in the form of a hydraulic pressure-media cylinder, which, together with a hydraulic pressure accumulator (not shown) The starting strand 4 is automatically fixed. The cassette-like design of the locking device 8 additionally enables fast assembly and disassembly.

1 mold
2 Strand Guide
3, 3a ~ 3d Strand guide segment
4 starting strand
5 cast strand
6 Transport route
7a, 7b Strand guide roller
7c Driveable strand guide roller
7d setting strand guide roller
8a to 8c Locking device
9 Front side of the strand guide segment
10 plate
11 Actuating device
12 Support frame of the strand guide segment
13 Strand guide segment adjustment devices
R Strand feed direction

Claims (15)

CLAIMS 1. A method for securing a start-up strand (4) in a strand guide (2) of a continuous casting installation comprising a plurality of strand guide rollers (7a, 7b)
Characterized in that the starting strands (4) are driven by driveable strand guide rollers (7c) when the starting strand (4) is threaded in towards the starting position which closes the mold (1) Is transported;
- before start of casting, by means of settable strand guide rollers (7d), said starting strand (4) is held at said starting position;
- by means of the driveable strand guide rollers (7c), the starting strand (4) and the cast strand (5) formed after the start of the casting are drawn out;
- one or more locking devices (8, 8a, 8b, 8c) arranged downstream in the strand transport direction (R) when the starting strand (4) The starting strand (4) is fixed; And
- opening and closing the transport path (6) formed by the strand guide rollers (7a, 7b, 7c, 7d) using the locking devices (8, 8a, 8b, 8c) (4) is fixed and released,
A method for securing a starting strand (4) comprising:
A plurality of locking devices (8, 8a, 8b, 8c) are distributed in the strand guide (2) and are fixed in turn when the starting strand (4) is being fitted towards the starting position, And subsequently released in succession.
A method for securing a starting strand (4).
The method according to claim 1,
When the electric device, the hydraulic device, the pneumatic device or the communication device fails, the locking device 8, 8a, 8b, 8c automatically locks the starting strand 4,
The dead weight of the locking devices 8, 8a, 8b and 8c defines the blocking position of the locking devices 8, 8a, 8b and 8c,
Characterized in that the locking device (8, 8a, 8b, 8c) can be displaced to the release position via an actuating apparatus (11)
A method for securing a starting strand (4).
3. The method according to claim 1 or 2,
8a, 8b, 8c arranged downstream in the strand transport direction R, the starting strand 4 is suddenly separated and crashed, So that the starting strand (4) is prevented from further moving downward,
A method for securing a starting strand (4).
As a continuous casting facility,
The continuous casting installation comprises a mold (1) and a strand guide (2) and comprises a starting strand (4)
The strand guide (2) is provided with a plurality of strand guide rollers (7a, 7b) along the strand conveying direction (R)
The starting strand (4)
The mold 1 is closed on the output side during casting start and can be held and moved within the strand guide 2 by the driveable strand guide rollers 7c and the settable strand guide rollers 7d ,
The strand guide rollers (7a, 7b) are continuous casting installations forming a transport path (6) for the starting strand (4)
That a plurality of locking devices 8, 8a, 8b, 8c with respect to the starting strand 4 are distributed in the strand guide 2, and
The locking devices 8, 8a, 8b, 8c are arranged to move from a release position placed outside the transport path 6 to a blocking position for blocking the transport path 6 of the starting strand 4, Characterized in that the locking devices (8, 8a, 8b, 8c) are designed so that they can be displaced.
Continuous casting equipment.
5. The method of claim 4,
Characterized in that said continuous casting installation has the form of a vertical continuous casting installation,
Continuous casting equipment.
5. The method of claim 4,
Characterized in that the continuous casting plant has the form of a bow-type continuous casting plant.
Continuous casting equipment.
The method according to any one of claims 4 to 6,
The locking devices 8, 8a, 8b and 8c are arranged on the strand guide segments 3, 3a, 3b and 3c or on the driving-roller stand 9, Is arranged between two adjacent strand guide rollers (7a, 7b) in the strand transport direction (R)
Continuous casting equipment.
The method according to any one of claims 4 to 6,
Characterized in that the locking devices (8, 8a, 8b, 8c) are arranged in a separate support structure.
Continuous casting equipment.
5. The method of claim 4,
The locking devices 8, 8a, 8b and 8c have the form of a displaceable or rotatable pin,
Characterized in that the pin is designed to be displaceable by the actuating mechanism (11)
Continuous casting equipment.
5. The method of claim 4,
The locking devices 8, 8a, 8b and 8c are in the form of a displaceable, inclined plate 10, or in the form of a tilting pin which is displaceable,
The dead weight of the locking devices 8, 8a, 8b and 8c defines the blocking position of the locking devices 8, 8a, 8b and 8c,
Characterized in that the locking device (8, 8a, 8b, 8c) can be displaced to the release position via the actuating mechanism (11)
Continuous casting equipment.
11. The method according to claim 9 or 10,
The actuating mechanism (11) comprises a pressure accumulator,
Characterized in that, using an actuating mechanism (11) having a pressure-medium cylinder configuration, said pressure accumulator defines a blocking position of said locking devices (8, 8a, 8b, 8c)
Continuous casting equipment.
11. The method according to claim 9 or 10,
The actuating mechanism (11) comprises a spring,
Characterized in that a spring force defines a blocking position of said locking devices (8, 8a, 8b, 8c)
Continuous casting equipment.
The method according to any one of claims 4 to 6,
The locking devices 8, 8a, 8b and 8c are in the form of a displaceable or rotatable plate 10,
Characterized in that the plate (10) is designed to be displaceable by an actuating mechanism (11)
Continuous casting equipment. delete delete

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