EP3099437A1

EP3099437A1 - Combined casting and rolling plant with pivotable roller table section

Info

Publication number: EP3099437A1
Application number: EP15702695.6A
Authority: EP
Inventors: Bernd Linzer; Wolfgang Peitl; Roman Winkler; Michael Zahedi
Original assignee: Primetals Technologies Austria GmbH
Current assignee: Primetals Technologies Austria GmbH
Priority date: 2014-01-27
Filing date: 2015-01-27
Publication date: 2016-12-07
Anticipated expiration: 2035-01-27
Also published as: WO2015110648A1; EP3099437B1

Abstract

A combined casting and rolling plant has an upstream part of the plant with a continuous casting installation (1, 2, 4) and a downstream part of the plant with a multi-stand rolling train (6) and, between the two parts of the plant, a pair of shears (11). Starting from the upstream part of the plant, a strand of metal (5) is conveyed via the shears (11) to the downstream part of the plant. In the event of an interruption in production, the strand of metal (5) is separated by means of the shears (11). The strand of metal (5b) in the upstream part of the plant is conveyed further and divided by means of the shears (11) into pieces (14), which are discharged. At the same time, a pivotable roller table section (16) of a roller table (15) arranged downstream of the shears (11) and directly adjacent to the shears (11) is pivoted downwards by an angle (α) about an axis of rotation (y) arranged transversely in relation to the main conveying direction (x). The pieces (14) are transported via the roller table section (16) to a new conveying device (17), which is aligned transversely in relation to the main conveying direction (x) and by means of which they are transported to a collecting station (18), which can also be emptied during the scrapping operation.

Description

description

The present invention relates to an operating method for a cast-rolled composite installation, which has a precursor plant part with a continuous casting plant, a downstream plant part with a multi-stand rolling mill and a pair of scissors between the two plant parts, comprising the process steps:

continuous - i. from any number of batches of molten metal without interruption immediately after one another - casting a metal strand in the continuous casting plant,

wherein, in normal operation, the metal strand, starting from the upstream plant part, is conveyed uncut along the main conveying direction via the shears to the downstream plant part and rolled in the rolling train to form a finished strip,

- In the case of a production interruption in the downstream part of the plant, the metal strand is separated by means of the scissors and the strand guide side metal strand is further promoted in the upstream part of the plant and divided into pieces by means of the scissors. The present invention further relates to a

Casting-rolling compound plant, which has an upstream plant part with a continuous casting plant for continuous casting of a metal strand, a downstream plant part with a multi-stand rolling mill and between the two plant parts a pair of scissors for dividing the metal strand into pieces.

The production of a casting-rolling composite system is often carried out in continuous operation, wherein the continuously cast and withdrawn from the continuous casting mold metal strand directly from the

Casting heat fed out of a rolling line and there to a metal strip - in individual cases as an alternative to heavy plate - rolled becomes. The rolling train are usually arranged downstream of a cooling section and / or a reel assembly with at least one reel.

In the case of a planned or unplanned downtime of the rolling train or other of the continuous casting mold and the strand guide downstream device, it is necessary to continue to deduct the metal strand from the continuous casting mold and request to continue to maintain the casting process can.

Likewise, unplanned problems may occur at the casting plant, such as e.g. tearing and re-healing of the strand shell forming in the mold, resulting in a deteriorated portion in the metal strand which is to be precipitated without causing cast-breakage.

Usually, this is achieved by a pair of scissors, which is placed behind the continuous casting plant or behind a possibly existing roughing stand and in front of a multi-stand rolling train and which can separate the produced metal strand into a strand guide side and a roll side part transversely to the production direction.

The scissors can be designed, for example, as a drum scissors, as pendulum scissors or as a crank scissors depending on the requirements of the cutting force. In particular, in the case of training as pendulum scissors or crank scissors, the scissors is often used in the event of an interruption of continuous operation as a crop shear for separating the tape end.

The pieces of the metal strip fall in known systems after separation on a directly below the scissors arranged metal chute. The pieces slide over the metal chute - usually transversely to the main conveying direction - until they drop into a receiving container (junk bucket). The receptacle, if it is accessible from above, can be lifted and emptied as needed by means of a crane. Is the receptacle due to structural circumstances of the casting-rolling composite system from above not accessible, a transport of the receptacle transverse to the main conveying direction is required until it can be reached from above by means of a crane. The scissors are due to the applied by her cutting performance very solid and therefore very heavy. Due to the high weight, the forces that occur and the vibrations that occur, large, stable foundations under the scissor stand are required. Since the metal chute is located in conventional systems directly below the scissors and thus also below the foundations of the scissor stand, the metal chute must usually be mounted deep below the scissors to ensure a sufficiently high and thus stable support for the scissors foundation. Furthermore, due to the high coefficient of friction of the separated, often hot metal pieces a steep slide is required. Overall, this results in a large height of the system. The separated from the scissors pieces usually have a relatively high weight, usually several tons, for example 2 tons to 7 tons. If such heavy pieces are fed over a significant drop height to the receptacle, it comes to very high impact loads. These loads can damage the metal chute and the foundations of the

Metal chute and the receptacle cause. Furthermore, it is possible for the pieces to tilt and get stuck while sliding on the metal chute. The same danger exists in the receptacle. All of these factors affect the depth of the receptacle and increase the cost of foundation structures.

Further, in the known devices for separating scrap pieces in the event of production stoppage, the amount of metal strip cut into pieces by means of scissors and subsequently discharged into a scrap container (also referred to as "scraping") is maintained to maintain a continuous casting operation can, through that Capacity of the scrap container or metal chute limited.

US Pat. No. 4,106,549 A discloses a device for removing severed pieces of a metal strand transversely to the production direction, in particular for cutting off ribbon ends-also referred to as "skimming" (see column 1 lines 7 and 34/35, column 2 lines 43) and 59), in particular for slab and billet pieces (see Column 1 lines 12, 13) in continuous casting plants, in which case the severed piece becomes one

pivotable roller table section, which is executed by a lever mechanism transversely to the main conveying direction of the metal strand tilted, transferred to a scrap container. In this embodiment, for each auszufördernde piece of the lever mechanism must be operated separately, which promotes the discharge of several directly successively separated pieces, in particular the Ausördern the metal still in the casting line in the event of an unplanned production interruption, either not allowed or only on conventional endless casting without upstream rolling stand - such as Slab or billet plants - limited in which the thickness of the cast metal strand is high and the speed of the cast metal strand is correspondingly low. Moreover, the need to operate the lever mechanism for each individual part to be removed requires increased wear of the moving parts as compared to

Discharge facilities, not for each

to be ejected piece a separate actuator movement must be performed.

In modern casting-rolling compounding systems in particular, an attempt is made to optimize the energy consumption, which is realized, for example, by having a roughing line between the casting plant and the shears in order to carry out a first reduction in the thickness of the cast metal strand, instead of an active one Preheating the still existing in the metal strand casting heat is used. However, this roughing due to the thickness reduction due to a correspondingly higher Belt speed in the downstream parts of the system compared to systems without reduction in thickness between casting and scissors, so that a discharge device for discharging severed pieces of tape for these higher speeds must be sized accordingly. In addition, the aim is to keep the length of a casting-rolling composite plant in the production direction low in order to minimize the heat losses of the metal strand. As a result, the energy consumption of the rolling train or a heating device upstream of the rolling train can be reduced. Furthermore, energy losses due to the Stefan-Boltzmann radiation law are highest in those areas of the plant in which the metal strand has the largest surface temperature: it is therefore endeavored to make the plant parts as short as possible behind the casting plant for energy-related reasons.

Moreover, in modern foundry-roll compounding systems, one is anxious to prevent cast-off in case of disturbances or short planned service interruptions, such the change of work rolls in the rolling mill - as possible to avoid, since the renewed casting of the casting requires a considerable operational effort. Instead, efforts are made to reduce the casting speed to a permissible minimum during production interruption and to eliminate the section of the metal strand produced thereby, without the casting plant being stopped thereby.

In the event of prolonged production stoppage on such a cast-rolled composite plant where the continuous casting operation can not or should not be maintained, the discharge device must be able to measure the amount of metal in the distribution trough, in the mold and in the mold the plant parts to scissors is to request to prevent the solidification of the cast metal strand in the casting sheet of the strand guide.

The generic operating method and the associated

Casting-rolling composite system are known from WO 2009/121678 AI, wherein in the event of a production interruption by means of a pair of scissors, the metal strand separated, raised the rolling-line side of the metal strand and the strand guide side, continuously nachgeförderte part of the metal strand is shredded by means of the scissors and the pieces on a lowerable roller table 18 in the main conveying direction according to FIG 2, or additionally, at Presence of a second pair of scissors, which allows the separation of longer pieces of the order of 8 to 14m, be discharged by means of a Ausfördervorrichung 8 transversely to the main conveying direction according to FIG 3 and FIG 4. If later the operation of the rolling train or the other, the continuous casting mold and the scissors downstream device can be resumed, the dismemberment is terminated and resumed the continuous operation. However, if only one lowerable roller table (18 in FIG. 2) is present, the amount of material that can be conveyed is limited by the capacity of the lowerable roller table before it has to be emptied. The presence of an additional discharge device 8 transversely to the production direction for longer pieces, as shown in Figure 3, although allowing the dismemberment and separation of material over a longer period, such as the empty conveying of the casting line in the event of an unplanned prolonged production interruption or the planned change of work rolls in the finishing train (14 in FIG. 1) with reduced casting speed, however, the relatively large length of the precursor material sections to be separated from 8 to 14 m corresponding to page 4 line 16 results in a corresponding length of the discharge device 8 in FIG. 3, leading to significant energy losses All due to thermal radiation due to the high surface temperature of the metal strip in this section of the system leads. In addition, the utilization of such rejected strip sections as a starting material has proved to be of little economic benefit because of the inferior metallurgical properties, therefore it seems more convenient to recycle all the precipitated material directly as scrap, which in turn results in a shorter length of the separated parts and thus allow the Ausfördervorrichtung to work in return energy efficient. From KR 89 72 36 Bl a cropping shear for metal strip with downstream metal chute is known transversely to the direction of production of the metal strip, wherein a tilt angle of the metal chute is adjustable. In this case, the tape head is detected by a radiation detector, see FIGS. 3a and 3b in FIG. 1 and FIG. 2, and the pieces of tape 5 separated from the scissors fall in free fall onto the metal chute 6, via which they are fed to a scrap container 8, see FIG. In this embodiment, however, the amount of abgeschrottetem material is limited by the absorption capacity of the metal chute and the scrap container, see Figure 2, which is why the device set out in KR 89 72 36 Bl is not suitable for a larger amount of metal strip during a long-lasting downtime to allow a pouring and rolling unit described above or to allow empty conveying of the pouring line as described above. Furthermore, cropping shears are usually designed as drum shears with a precise cutting position on the metal strip in order to keep the cut strip - and thus the scrap portion - as low as possible, which, however, requires a corresponding distance between detector and crop shear for geometrical and signal processing reasons. This situation can be seen in FIG. 1 and FIG. 2 and would have a corresponding disadvantageous effect with respect to radiation losses when using such a device in a cast-rolled composite installation. Moreover, the metal chute is directly below the scissors and thus below the - necessarily massive - Scherenfundamente arranged, which, together with the apparent in Figure 2 and Figure 5 steepness of the metal chute a correspondingly large height required.

The object of the present invention is to provide a device on a casting-rolling composite, the

- dividing an arbitrarily long section of a metal strand produced in the endless casting process by means of a pair of scissors,

- The separated by means of the scissors pieces transverse to the main conveying direction of the metal strand and with a possible low number of actuator movements into a collecting station,

- whose height below the scissors is lower than that of known scissors,

- whose length in the main conveying direction of the metal strand between the pair of scissors and the downstream rolling mill is lower than in known systems,

and works reliably. The object is achieved by an operating method with the features of claim 1. Advantageous embodiments of the manufacturing method are the subject of the dependent claims 2 to 7. According to the invention an operating method of the type mentioned is configured by

- That a directly adjacent to the scissors, pivotable roller table section of the scissors downstream roller table is pivoted about a transverse to the main conveying direction of rotation axis by a certain angle down

- That the separated pieces of the scissors fed over the obliquely downwardly pivoted roller table section of a conveyor and

- That the pieces by means of the conveyor transversely to

Main conveying direction are transported to a collecting station, wherein the collection station has at least three receptacles and can also be emptied during scrapping of material through the scissors. By doing so, it is possible, in the case of prolonged interruptions in production, to empty the pouring line in a controlled manner and to maintain the continuous casting operation for any time, for example, to have more time for a final decision on a casting interruption in the event of plant breakdowns. The separated from the scissors pieces are fed to a collecting station, which has at least three receptacles and, based on the

Main conveying direction, the side of the casting-rolling composite system is and therefore accessible for Abtransporteinrichtungen in a simple manner. Furthermore, by the at least three receptacles, a removal of the separated pieces parallel to the scraping and discharging material from the casting-rolling composite system possible. Furthermore, a

Outfeed device of known type such as e.g. omitted in WO 2009/121 678 AI, 8 in FIG 3 and FIG 4 and it is both the length in the main conveying direction between the pair of scissors and the downstream rolling stand and the height below the scissors to be reduced. As a result, results in a continuous operation less heat loss and thus among other things an improved energy balance, also can the

Casting-rolling compounding system can be produced more cost-effectively. Of the at least three receptacles, there is always a receiving container immediately in front of the conveying device in a so-called collecting position for receiving the pieces conveyed by the conveying device, while at least one further emptied receptacle is in a picking position of the collecting station and at least one further, usually at least one partially filled receptacle is transported as quickly as possible from a lifting position of the collecting station. By this configuration, replacement of the usually at least partially filled receptacle in the collection position is ensured at any time by the advancement of an empty receptacle. By the removal of a receptacle from the Aushebeposition by an external transport device, such. a crane, moving an empty receptacle of the

Lifting position to the collection position and subsequent re-delivery of an emptied receptacle into the collection position

Lifting position can be transported away indefinitely from the casting-rolling compound deposited material, while the casting-rolling composite system simultaneously separates material from the produced metal strand and discharged.

It is also possible that the conveyor is located below a fixed, the scissors downstream roller table section. As a result, the length of the casting-rolling composite system reduced in the direction of production and it will reduce energy radiation losses of the hot, produced metal strand. In this case, the conveyor can be directed obliquely downwards. In this case, the inclination of the conveying device may be so great that the pieces are fed to the collecting station by their weight. The conveyor may alternatively have rollers or be designed as a slide. In the case of roles, a slight inclination of the conveyor is sufficient. In the case of a slide, the slope must be greater to overcome the static friction and sliding friction. In the case of feeding the pieces by their weight, no drive is required for the conveyor. Alternatively, it is possible that the conveyor is directed horizontally or only slightly obliquely. In this case, the pieces are fed to the collecting station by means of a driven conveyor. In the case of a driven transport device, the pieces can be fed to the collecting station with a defined speed and defined orientation, so that they can be stacked ("sifted") to save space be.

In a preferred embodiment, the scissors is at least one additional rolling stand - sometimes more than one more

Roll stand - arranged upstream in the form of a roughing mill, which rolls the cast metal strand to a pre-strip. As a result, the casting heat still contained in the material can be used to a first reduction in thickness, which allows an energetically favorable operation of the casting-rolling composite system.

Preferably, a receptacle, which is located in the collecting station in a directly adjacent to the receiving position removal position, as quickly as possible, for example by moving or by crane removal removed and emptied receptacle as soon as possible into a waiting position of the collection station. This results in a quick and smooth change of the receptacles made possible. Since the collecting station is located laterally of the casting-rolling compound, this rolling of the receptacle is preferably parallel to the production operation of the casting-rolling composite, especially during the ex-divorce of material from the casting-rolling composite system in the collection station, which a swift operation of the

Casting-rolling composite system with only a few interruptions allows and therefore is economically favorable. Preferably, the cast-rolling compounding equipment is operated so that on the one hand the cutting times of the scissors, the movements of the transport device - if present - are synchronized to convey the pieces into the collecting station and the movements for positioning the receptacles in the collecting station, so that at any time An unplanned plant failure or a planned production interruption may occur without a cast-iron demolition must be brought about and without any excreted pieces in the conveyor jam or fall between the receptacle. This can be achieved, for example, in that the casting-rolling composite system or. the necessary trades of the casting-rolling composite system are connected to an automation device. Moving a full container from the collection position to the picking position typically requires about fifteen seconds. At maximum production speed, the cutting sequence of the scissors, depending on the thickness of the produced metal strand, may be in a time range shorter than the period for changing the receptacles in the collecting station, for example 4 to 5 seconds. Now material must be eliminated, e.g. because sudden an error at the

Cast-rolling composite unit occurs or because a qualitatively inferior portion of the metal strand is to be eliminated or because a work roll is to be changed in the subsequent rolling mill, so it is trying to maintain the continuous casting, for example, by reducing the casting speed to a minimum. In addition, the reduction in thickness of a possibly existing roughing stand can be temporarily suspended: both measures lead To a reduced speed of the metal strand or the Vorbandes on the scissors, so that the time between two cuts of the scissors increases significantly, for example, to 60 seconds. At this reduced speed, therefore, a container change in the collecting station can be easily carried out, but due to the inertia of the control cycles of the individual trades, a corresponding period of time is to be scheduled until the reduced speed of the produced metal strand on the shear is reached. It is therefore an object to take this circumstance into account and to carry out a change of the receptacles only if either no material is eliminated or if the production speed permits this. This can be achieved, for example, by an automation device which is signal-connected with the cast-and-roll composite system, by calculating the filling level of the receiving container in the receiving position based on the production speed and the number and length of the pieces separated by the scissors and timely changing the container and the container Removal of or at least partially filled containers from a removal position is caused, for example by the drives of the containers are controlled accordingly and the external Abtransporteinrichtungen, such as cranes at the

Gieß-Walz-Verbundanlage, signal technology to be requested or the operators of the casting-rolling compound system are signaled technically to the necessary steps.

Preferably, the pieces separated from the scissors have a length which is between 2 m and 4 m. These lengths have proven to be particularly easy to handle.

The angle by which the pivotable roller table section is pivoted down, is in a range between 10 ° and 40 °, preferably in a range between 20 ° and 30 °. On the one hand, this angular range enables the controlled one

Transport of the separated pieces by means of the usually driven rollers of the pivotable roller table section to the conveyor, so that there is no slipping or tilting of the pieces and no damage to the conveyor comes. On the other hand, in this area, the inclination of the pivotable roller table section is sufficiently large to the necessary depth of the conveyor below the fixed

Roller section of the scissors downstream roller table to achieve a sufficiently short length in the production direction, so that in normal operation, the radiation losses of the metal strand are limited, which has an advantageous effect on the energy consumption of the casting-rolling compound. The object is further achieved by a casting-rolling composite system with the features of claim 8. Advantageous embodiments of the metallurgical plant are the subject matter of the dependent claims 9 to 15. According to the invention, a casting-rolling composite installation of the type mentioned above is configured by

that a roller table disposed immediately downstream of the pair of scissors has a pivotable roller table section which can be pivoted downwards by a certain angle about an axis of rotation arranged transversely to the main conveying direction,

in that it comprises a conveyor arranged at the outlet of the pivotable roller table section, oriented transversely to the main conveyor direction, the pieces being fed via the roller table section pivoted downwards to the conveyor device,

- That it has arranged at the outlet of the conveyor collecting station with a first receptacle and at least two other receptacles, wherein the at least three receptacles are moved horizontally and wherein a receptacle transported away from the collecting station and also during the feeding of pieces in the first receptacle from the collecting station and another Receptacle can be transported to the collection station. The advantageous embodiments of the metallurgical system correspond substantially with the advantageous embodiments of the operating method. Preferably, the collecting station is dimensioned such that it has a capacity which corresponds to at least one filling of the distributor trough of the continuous casting plant plus the amount of metal which is located in the continuous casting mold and between the continuous casting mold and the scissors. This ensures that even in the worst case, and thus regardless of the time of an unplanned production interruption at any time pouring can be continued until the entire amount of metal in the distributor channel shed and the continuous casting mold and the strand guide are emptied.

Furthermore, the absorption capacity of the at least three receiving containers of the collecting station in each case preferably corresponds to less than the filling of the distributor trough, plus the amount of metal which is located in the continuous casting mold and between the continuous casting mold and the shears. In this case, while the pieces are each fed to one of the receptacles, another, partially or completely filled receptacle must be removed from the collection station and an empty receptacle fed to the collection station. In return, the receptacle, however, in the filled state, a relatively low weight, so that they can be easily absorbed and offset in a relatively simple manner by means of a normal, usually present on the casting-rolling compound plant crane

Preferably, the drives of the receptacle of the collecting station drives, which can be operated by remote control technology. As a result, the receptacle can be configured automatically driving, so that no operator must go to the danger zone of the collecting station for moving the receptacle within the collection station.

Preferably, the scissors, a possibly existing transport device for feeding the separated pieces in the collecting station and the drives of the receptacle with a automation device are connected by remote control technology. This automation device can, for example, the Cutting time of the scissors, optimize the movements of the optionally existing transport device and the process of receiving containers in the collection station in time, which is beneficial to the production rate of

Casting-Walz-composite plant affects. Furthermore, the automation device can, for example, control and synchronize the movements of said units in such a way that the remaining capacity of the receptacle in the collection position is sufficient at any time to be able to pick up the discharged pieces at maximum production speed of the metal strand when the pieces are separated by the scissors until the production speed of the foundry-rolling compound is reduced so that the time between two cuts of the scissors is sufficient to move the receiving container from the collection position to the removal position and to request an empty receptacle in the collection position.

Preferably, the receptacle of the collecting station are horizontally movable on rails. As a result, a rapid displacement of the receptacle, in particular filled with several tons of scrap receptacles accomplish, since in the case of rails, the drive energy is essentially needed only to overcome the inertia, while adhesion and rolling resistance play only a minor role. In the case of electric drives of the receptacle, the supply of electrical energy can be easily integrated into the rail system. Preferably, pins are laterally attached to the receptacles to which the receptacle can be lifted by a crane. This allows the rapid attachment of suitable lifting means - such as crane hooks mounted at a fixed distance to each other - by the crane itself, without the need for operating personnel. This ensures a rapid removal or transport of the receptacle from or to the collecting station, without requiring operating personnel to move to the danger zone of the collecting station. The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments, which will be described in detail in conjunction with the drawings. Here are shown in a schematic representation:

1 shows a casting-rolling composite system

2 shows a portion of the metallurgical plant of FIG

1 in a first embodiment from the side, FIG. 3 the partial region from FIG. 2 from a direction designated III-III in FIG.

4 shows a portion of the metallurgical system of FIG

1 in a second embodiment from the side and

5 shows the portion of FIG 4 from a in FIG 4 with

V-V designated direction.

The present invention will be explained below in connection with a casting-rolling compound plant, which has a continuous casting plant as an upstream plant part. In principle, however, the upstream part of the system could also have a different configuration, for example as a rolling train (in particular roughing train) with at least one roll stand and up to three roll stands.

In the case of a continuous casting this has according to the illustration in Figure 1, a distributor trough 1, a continuous casting mold 2 and a strand guide 4. In an endless operation of the casting-rolling composite system, liquid metal 3-for example steel or aluminum-is continuously poured into the continuous casting mold 2 via the distributor channel 1. The continuous casting mold 2 is cooled, so that the liquid metal 3 solidifies in the continuous casting mold 2 at least in its outer regions to form a strand shell. In this state, the metal 3 is withdrawn by means of a strand guide 4 as a metal strand 5 from the continuous casting mold 2. Also in the strand guide 4 is a cooling. At the latest in the strand guide 4 takes place a complete solidification of the metal strand 5. Often the strand guide 4 are further downstream of a reheating furnace and / or a descaling device. These system parts are not shown in FIG 1, because it is of minor importance in the context of the present invention, whether they are present or not.

The present invention will be further explained below in connection with a casting-rolling compound, which has a rolling mill 6 as a downstream part of the plant. In principle, however, the downstream system part could also have a different configuration, for example, be designed as a cooling section or as a reel. In the case of a rolling train 6, the metal strand 5 is fed via the strand guide 4 in a - generally horizontal - main conveying direction x of the rolling train 6. The rolling train 6 generally has a number of rolling stands 7, for example four to seven rolling stands 7. In the rolling train 6, the metal strand 5 is rolled into a flat metal product 8. The rolling train 6 is usually downstream of a cooling section 9, in which the metal product 8 is cooled. Of the rolling train 6 is often - optionally after the cooling section 9 - arranged downstream of a memory array 10, for example, a Haspelan- order with at least one reel.

Between the strand guide 4 and the rolling mill 6 - generally between the upstream and downstream plant part - a pair of scissors 11 is arranged. The scissors 11 may for example be designed as pendulum scissors or as a crank scissors.

As shown in FIG 1, the existing of continuous casting mold 2 and strand guide 4 continuous casting is designed as a vertical bow system. This embodiment is common and preferred in the case of a continuous casting plant. However, other embodiments are possible. According to the illustration in FIG. 1, the scissors 11 are furthermore at least one further rolling stand 12 - sometimes more than one further Roll stand - upstream in the form of a rough rolling 12. Depending on the cast thickness d of the metal strand 5, however, the further roughing train 12 may be omitted under certain circumstances. In continuous operation, the scissors 11 is not used. However, it is possible that a production interruption in the rolling train 6 - for example, due to a roll change - or another, the scissors 11 downstream device or generally the casting-rolling compound - for example, the cooling section 9 or the storage device 10 - occurs. In this case, by means of the scissors 11, the metal strand 5 is separated into a portion 5a of the metal strand 5 on the side of the upstream plant part and a portion 5b of the metal strand 5 on the side of the downstream plant part. The section 5a of the metal strand 5 - ie the portion of the metal strand 5, which is seen from the scissors 11 in the direction of the downstream part of the plant - is hereinafter referred to as rolling mill side metal strand 5a. The roll side metal strand 5a is of minor importance in the context of the present invention. Decisive in the context of the present invention, the treatment of the other portion 5b of the metal strand 5, hereinafter referred to as strand-side metal strand 5b. In general terms, the terms strand side and rolling road side are always referred to the shear 11 as a limit.

Despite a production interruption in the scissors 11 downstream device 6, 9, 10 or due to a minwertwertigen strand section, which is to be eliminated, the operation of the continuous casting plant is to be maintained. Therefore, in particular, the strand-guiding-side metal strand 5b is further conveyed in the direction of the rolling train 6. However, since the strand-guide-side metal strand 5b is not allowed to reach the rolling train 6 due to the production interruption, the strand-guide-side metal strand 5b is divided into pieces 14 by the scissors 11. The pieces 14 have a length 1, the different operating parameters of the Casting-rolling compound is dependent. The length 1 depends in particular on the cycle time of the scissors 11 and the conveying speed of the metal strand 5 from. In general, the length 1 is between 2 m and 4 m, for example at 2.50 m to 3.50 m.

The casting-rolling composite plant has a roller table on a roller table 15, which consists of a directly adjacent to the scissors 11, downwardly pivotable portion 16 and a fixed portion 13. The section 16 can be pivoted about an axis of rotation y arranged transversely to the main conveying direction x by an angle α downwards. FIG 2 shows the pivotable roller table section 16 in dashed lines in the raised - usually horizontal - position and in solid lines in the lowered position. In this position - the lowered position - is the section 16 of the roller table 15 in the event of a production interruption. About the pivotable roller table section 16, the pieces 14 are fed obliquely down a conveyor 17. The conveyor 17 is formed as shown in FIGS 2 and 3 as a slide. However, other configurations, in particular with rollers, are also possible. By means of the conveyor 17, the pieces 14 are fed to a collecting station 18. There, the pieces 14 are recorded and collected. According to FIG 2 and 3, the conveyor 17 is disposed below the fixed roller table section 13 of the scissors immediately downstream roller table 15. This embodiment is preferred. Furthermore, the pieces 14 are transported by means of the conveyor 17, with respect to a horizontal plane, transversely to the main conveying direction x. A transverse conveying direction defined by the conveying device 17 may therefore, in accordance with the representation of FIGS. 2 and 3, have a vertical, downwardly directed component. However, a horizontal component of the transverse conveying direction is orthogonal to the main conveying direction x. This allows the collection station 18 laterally outside of the through

Arrangement of the strand guide 4 and the rolling mill 6 defined rolling line can be arranged. In the case of the embodiment of the upstream part of the plant as a distributor trough 1, continuous casting mold 2 and downstream

Strand guide 4, the collection station 18 preferably has a receiving capacity corresponding to at least one filling of the distributor trough 1 plus the amount of metal 3, which is located in the continuous casting mold 2 and between the continuous casting mold 2 and the scissors 11. As a result, even under unfavorable circumstances, the operation of the continuous casting plant can always be maintained indefinitely, in particular until the distributor trough 1 is completely emptied. Depending on the configuration of the metallurgical plant, this corresponds to a mass of approx. 30 tonnes to approx. 80 tonnes, in particular approx. 35 tonnes to approx. 75 tonnes.

2 and 3, the collecting station 18 preferably has a plurality of at least three receiving containers 19, 19 'and 19 ", of which the receiving container 19 is located in the discharge region of the conveying device 17 in the collecting position in which the pieces 14 are located A further container 19 ", represented by dashed lines in FIGS. 2 and 4, which is usually partially or completely filled with the precipitated pieces 14, is located in the so-called" empty position ". Removal position and is from there as quickly as possible, for example by means of a crane, removed from the collection station 18 to allow at any time the displacement of the full or at least partially filled receptacle 19 from the collection position and the corresponding advancement of the empty receptacle 19 '. The removal of the receiving container 19 "is indicated by an arrow A in FIG 2. A further receiving container 19 'is in the emptied state of a so-called waiting position, into which it can be fed via a crane or in another way to the collecting station 18. For the Interaction with the crane, the receptacle 19, 19 ', 19 "preferably laterally pin 20 on.

Due to the presence of a plurality of receptacles 19, 19 'and 19 ", it is possible that a receiving capacity of the receptacle 19 each considered less by itself Filling the distributor trough 1 plus the amount of metal 3, which is located in the continuous casting mold 2 and between the continuous casting mold 2 and the scissors 11. For example, the receiving container 19, 19 ^λ, 19 can "Property Assets each a Fas sung have from about 30 tons a result, the receiving container 19 located in the removal position." By a conventional crane - without special construction of the crane - from the collecting station 18 removed , emptied and fed back to the collection station 18.

The receiving containers 19, 19 ', 19 "are preferably moved on rails 21 within the collecting station 18. It is possible for the receiving containers 19 to have their own drive, for example an electric motor Alternatively, the receiving containers 19 are moved from the outside by means of a hydraulic cylinder device or possible with a chain or cable pull.

In the embodiment according to FIGS 2 and 3, the conveyor 17 is directed obliquely downwards. The inclination is chosen such that the pieces 14 are fed to the collecting station 18 by their weight. In the case of the design of the conveyor 17 as a chute, the inclination is selected, for example, such that the weight overcomes the static friction and the sliding friction. In the case of the design of the conveying device 17 as an inclined roller table, the inclination can be selected to be correspondingly lower, since no static friction forces have to be overcome.

In contrast to the embodiment of Figures 2 and 3, the conveyor 17 in the embodiment of Figures 4 and 5, however, directed horizontally or only slightly obliquely downwards. For this reason, the conveyor 17 has a transport device 22. By means of the transport device 22, the pieces 14 of the collecting station 18 are supplied. The

Transport device 22 may be formed, for example, as a hydraulically operated slide. The embodiment of FIGS. 4 and 5 is particularly preferable when a large one Pit depth is possible only with great effort, for example because the groundwater level is very high. Furthermore, this procedure offers the advantage that the alignment of the pieces 14 is maintained not only on the pivotable roller table section 16 but also on the conveyor 17. Sticking or wedging can be prevented with certainty. Also, the pieces 14 can be directed into the receptacle 19 transferred and thereby sizing. The conveyor 17 is oriented transversely to the main conveying direction of the casting-rolling composite system and according to FIG 3 and FIG 5 has a sufficient length, so that the collecting station 18 in a sufficiently large lateral distance to

Cast rolling compound unit is that the rolling of the receptacle 19, 19 'and 19 "can also take place during production and in particular during the discharge of pieces 14.

Although the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1 distributor trough

2 continuous casting mold

3 metal

4 strand guide

5 metal strand

5a rolling mill side metal strand

5b strand-side metal strand 5 'pre-strip

6 rolling mill

7 rolling stands

8 finishing strips

9 cooling section

10 memory arrangement

11 scissors

12 roughing line

13 fixed roller table section

14 pieces

15 roller table

16 pivoting roller table section

17 conveyor

18 collecting station

19 receptacle in collection position 19 'receptacle in waiting position

19 "receptacle in removal position

20 cones

21 rails

22 transport device

A arrow

d poured thickness

1 length

x Main conveying direction

y axis of rotation

α angle

Claims

claims

1. Operating method for a casting-rolling composite system, the upstream part of a plant with a continuous casting (1, 2, 4), a subordinate part of the plant with a mehrgerüstigen

Rolling mill (6) and between the two parts of the plant a pair of scissors (11), comprising the steps of:

- Continuous casting of a metal strand (5) in the

Continuous casting plant (1, 2, 4),

- In normal operation, the metal strand (5) from the upstream part of the plant uncut along the main conveying direction (x) on the scissors (11) promoted to the downstream part of the plant and rolled in the rolling train (6) to a finished strip (8),

- In the case of a production interruption in the downstream part of the plant metal strand (5) by means of scissors (11) is separated and the strand guide side metal strand (5b) further promoted in the upstream part of the plant and by means of scissors (11) into pieces (14),

- An immediately adjacent to the scissors (11), pivotable roller table section (16) of the scissors (11) downstream roller (15) about a transversely to the main conveying direction (x) arranged axis of rotation (y) by an angle (ot) downwards pivoted becomes,

- Wherein the pieces (14) via the obliquely downwardly pivoted roller table section (16) of a conveyor (17) are fed, and

- wherein the pieces by means of the conveyor (17) transversely to the main conveying direction (x) to a collecting station (18) are transported, wherein the collecting station (18) has at least three receptacles (19, 19 'and 19 ") and also during the Cutting pieces (14) through the scissors (11) can be emptied.

2. Operating method according to claim 1, characterized in that the conveyor (17) below a fixed roller table section (13) of the scissors (11) downstream roller table (15) and is directed obliquely downwards, so that the pieces (14) are fed by their weight to the collecting station (18), or that the conveyor (17) below a fixed roller table section (13) of the scissors (11) downstream roller table (15) and is horizontal or only slightly inclined is directed and the pieces (14) by means of a driven transport device (22) of the collecting station (18) are supplied.

3. Operating method according to claim 1 or 2, characterized in that an uncut metal strand (5) in one

Vorwalzstraße (12) with at least one roughing stand to a pre-strip (5 ^λ ) is pre-rolled.

4. Operating method according to one of claims 1 to 3, characterized in that at least one full or at least partially filled receptacle (19 'from a

Removal position is removed and another empty receptacle (19 of the collecting station (18) is fed back into a waiting position, while the pieces (14) a receiving container (19), which is located in a collection position immediately in front of the conveyor (17) ,

5. Operating method according to claim 4, characterized in that the cutting time of the scissors (11), the movements of any existing transport device (22) and the movements of the receptacle (19, 19 'and 19 ^{λ λ} ) in the collecting station (18) in such a way be synchronized, that at any time the remaining capacity of a first receptacle (19), which is located in a collection position immediately in front of the conveyor (17) is sufficient to those of the shear (11) separated and conveyed by the conveyor (17) To be able to accommodate pieces (14) until the first receptacle (19) moved to a removal position and a second, empty receptacle (19 can be fed from a waiting position to the collection position, without the first receptacle (19) is overfilled or that the pieces (14) fall between the first receptacle (19) and the second receptacle (19).

6. Operating method according to one of the preceding claims, characterized in that the pieces (14) have a length (1) which is between 2 m and 4 m.

7. Operating method according to one of the preceding claims, characterized in that the angle (ot) between 10 ° and 40 °, preferably between 20 ° and 30 °.

8. Gieß-Walz -Verbundanlage, the an upstream part of the plant with a continuous casting plant (1, 2, 4) for continuously casting a metal strand (5), a downstream part of the plant with a multi-stand rolling train (6) and between the two plant parts a pair of scissors (11 ) for dividing the metal strand (5) into pieces (14), comprising:

- One of the scissors (11) downstream roller table (15) with a directly adjacent to the scissors, pivoting

Roller table section (16) which can be pivoted about an axis of rotation (y) arranged transversely to the main conveying direction (x) by an angle (ot),

a conveying device (17) arranged at the outlet of the pivotable roller table section (16), oriented transversely to the main conveying direction (x), whereby the pieces (14) can be fed to the conveyor device (17) via the inclined roller table section (16);

- One at the outlet of the conveyor (17) arranged

Collection station (18) with a first receptacle (19) and at least two further receptacles (19 'and 19 "), wherein the at least three receptacles (19, 19' and 19") are horizontally movable and wherein also during the feeding of pieces ( 14) in the first receptacle (19) a receptacle (19 of the collecting station (18) transported away and a receptacle (19 ") can be transported to the collecting station (18).

9. Casting-rolling compound according to claim 8, characterized in that the conveyor (17) below a fixed roller table section (13) of the roller table (15) and is directed obliquely downwards, so that the pieces (14) by their weight the collecting station (18) can be supplied or that the conveyor (17) below a fixed roller table section (13) of the roller table (15) and is horizontal or only slightly obliquely directed and the pieces (14) by means of a driven transport device (22) the collecting station (18) can be supplied.

10. Cast-rolling composite installation according to claim 8 or 9, characterized in that between the continuous casting plant (1, 2, 4) and the scissors (11) a roughing mill (12) is arranged with at least one roughing stand, with an uncut

Metal strand (5) can be rolled to a pre-strip (5 ^λ ).

11. Cast-rolling composite installation according to one of claims 8 to 10, characterized in that the collecting station (18) has a

Receiving capacity which corresponds to at least one filling of the distributor trough (1) plus the amount of metal (3) in the continuous casting mold (2) and between the

Continuous casting mold (2) and the scissors (11) is located and that the absorption capacity of the at least three receptacles (19, 19 ') and 19 ") considered in each case less than the filling of the distributor trough (1) plus the amount of metal (3) corresponding to that in the continuous casting mold (2) and between the

Continuous casting mold (2) and the scissors (11) is located.

12. Cast-rolling composite installation according to claim 11, characterized in that the receptacle (19, 19 'and 19 ") of the collecting station (18) have drives that can be operated by remote control.

13. Cast-rolling composite installation according to claim 12, characterized in that the scissors (11), an optionally present transport device (22) and the drives of the Aufhof Container (19, 19 'and 19 ") are connected by remote control technology with an automation device.

14. Cast-rolling composite installation according to one of claims 11 to 13, characterized in that the at least three receptacles

(19, 19 'and 19 ") are horizontally movable on rails (21).

15. Cast-rolling composite installation according to one of claims 11 to 14, characterized in that the at least three receptacles (19, 19 'and 19 ") have laterally arranged pins (20).