JPH09323115A - Device for lifting cobble of hot rolling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cobble lifting device for lifting cobbles so as not to slide on rolls at the time of pushing out the cobbles on a transporting roll train. SOLUTION: This device is provided with a cobble lifting members 3 which are housed in a hollow 2b which penetrates aprons 2 provided between adjacent transporting rolls 1a, 1a in the right and left direction X, mechanism 4 for holding/lifting the cobble lifting member with which each cobble lifting member 3 is held, also elevated and lowered and cobble lifting member driving mechanism for driving many cobble lifting members 3 so that they are simultaneously elevated and lowered. And, each apron 2 consists of plural plate-like bodies which are erected with proper intervals parallel to the traveling direction Y of a material to be rolled and in the right and left direction X and, furthermore, each cobble lifting member 3 is extended in the right and left direction X so as to longitudinally divided in the apron 2 and, by cutting the plate-like body in a comb-teeth shape so that the cobble lifting member does not interfere with each plate-like body comprising the aprons 2 at the time of elevating and lowering, plural cobble supporting parts 3a are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cobble lifting device for hot rolling equipment. In detail, in case of trouble in the operation of the hot rolling equipment, when the strip-shaped material to be rolled (hereinafter referred to as "cobble") on the conveying roll row is pushed out to the side, it is conveyed so as not to slide on the rolls. The present invention relates to a cobble lifting device for lifting a cobble above a roll.

[0002]

2. Description of the Related Art Conventionally, due to a trouble in the operation of a hot rolling facility, it has been necessary to stop the operation and extrude a hot strip-shaped cobble on a conveyor roll row consisting of a plurality of rolls onto a side skid. May occur. In this case,
As shown in FIG.
High temperature strip-shaped cobbles (not shown)
Are simultaneously pushed by a plurality of cobble pushers 7 arranged along the transport roll row 1 and are discharged onto the side skid 8. This excluded cobble is usually a skid 8
After being cooled above, it is cut and reused as scrap.

[0003]

However, in the conventional hot rolling equipment, when the cobbles on the transport roll 1a are extruded and eliminated, the cobbles slide on the transport roll 1a, which causes the transport roll 1a to slide. If 1a is scratched, or if the cobble is made of high-temperature stainless steel, a part of it may be seized on the transport roll due to its viscosity. Therefore, before restarting the operation, it is necessary to grind scratches / adhered substances on the large number of the transport rolls 1a with a grinder or the like. In addition, this work is a manual work, is poor in workability, is complicated, and requires a considerable amount of time. In addition, the operation cannot be restarted during that time, and the production is stopped, so there is a problem that the production is reduced accordingly.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art. The purpose of the present invention is to remove the cobbles, especially when the cobbles are laterally removed from the top of the transport roll. It is to provide a cobble lifting device for hot rolling equipment including a cobble lifting member for temporarily lifting a cobble in each apron provided between adjacent transfer rolls so as not to slide on the transfer rolls. .

[0005]

In order to achieve the above object, a cobble lifting device for hot rolling equipment according to the first aspect of the present invention comprises:
An upper surface of an apron (2) provided between the adjacent transport rolls (1a, 1a) for guiding the traveling rolled material (90) from the upstream transport roll (1a) to the downstream transport roll (1a) The cobble lifting member (3) arranged below, the cobble lifting member holding / elevating mechanism (4) for holding and lifting the cobble lifting member (3), and a large number of cobble lifting members (3) correspond. A cobble lifting member drive mechanism (5) for driving the cobble lifting member holding / elevating mechanism to move up and down all at once, and each apron (2) has a traveling direction of a material to be rolled (90). Running direction (Y) of the material to be rolled (90) arranged at appropriate intervals in the direction perpendicular to (Y)
A plurality of apron strips (2a) extending in the direction of the apron strips (2a) adjacent to each other.
a, 2a) a plurality of cobble support parts (3
a) and having a plurality of cobble supports (3a)
All are connected together at the bottom, and during normal operation,
The upper end surface of the cobble support part (3a) is slightly lower than the upper surface of each apron (2) so that it does not come into contact with the material to be rolled (90) traveling on the transport roll (1a). , And is held so as to be higher than the top of the transport roll (1a) (claim 1).

Further, in the cobble lifting device for hot rolling equipment of the second invention, each apron (2) of the constitution of the first invention is composed of a plurality of plate-like bodies, and the upper part of the plate-like bodies is provided. The central part of the apron (2) is hollowed out, leaving an appropriate width on the left and right, and an inner cavity (2b) for accommodating the cobble lifting member (3) is formed in the central part of the apron (2). (3) consists of one plate perpendicular to the plate-like body, extends in the left-right direction (X) so as to cross the apron (2) longitudinally, and further, does not interfere with the apron (2) when moving up and down. The portion corresponding to each plate-shaped member is hollowed out like a comb tooth (claim 2).

In the cobble lifting device for hot rolling equipment of the third invention, the cobble lifting member holding / elevating mechanism (4) of the constitution of the first or second invention is provided at each of the left and right ends of the cobble lifting member (3). A first lever (4b), which is supported integrally with the rolled material (90) in parallel with the traveling direction (Y) of the material to be rolled and is horizontal, is vertically provided at the center of a horizontal spindle (4a). Another link (4c) is connected between the first lever (4b) and each of the left and right ends of the cobble lifting member (3), and the links rotate integrally with one end of each main shaft (4a). The lever (4d) is connected, and the second lever (4
A horizontal connecting rod (4e) is connected between d, 4d), and a third lever (4f) that rotates integrally is connected to the other end of one main shaft (4a) of the cobble lifting member (3). To the other end of the third lever (4f), a connecting rod (4g) that extends toward the skid (8) opposite to the cobble pusher side and moves back and forth in the left-right direction (X) is connected. When moving back and forth, the third lever (4f), the main shaft (4a), the first lever (4
(b, 4b) and the second lever (4d, 4d) are interlocked to rotate, so that the cobble lifting member (3) moves up and down (claim 3).

In the cobble lifting device for hot rolling equipment of the fourth invention, in addition to the structure of the third invention, the cobble lifting member drive mechanism (5) has one end at the other end of each connecting rod (4g). Is rotatably supported and its corners are rotatably connected to each other. The horizontal substantially L-shaped plate-shaped direction conversion lever (5a) and the other end of the direction conversion lever (5a) are rotatable. Connected,
A connecting member (5b) parallel to the running direction (Y) of the material to be rolled (90) and two connecting members (5b, 5b) for connecting parallel to the running direction (Y) of the material to be rolled (90). Connection auxiliary member (5c), a plurality of connection members (5b), and a connection member row (K) formed by connecting the connection auxiliary members (5c).
And a drive hydraulic cylinder (5e) rotatably connected to the base end connecting member (5d) connected to the base end of each of the base end connecting members (5d). When (5e) moves back and forth, all the connecting members (5b) connected to it move forward and backward, whereby all the direction changing levers (5a) rotate, the operating directions are changed, and all the connecting rods (4g) are moved. It is configured to move back and forth all at once in the left-right direction (X) (claim 4). The symbols in parentheses described in the means for solving the above-described problems correspond to the symbols described in the drawings and the embodiments of the invention described later.

According to the first or second aspect of the invention, when the operation of the hot rolling equipment is stopped due to a trouble in the operation of the hot rolling equipment, the cobble lifting member drive mechanism and the cobble lifting member holding / elevating mechanism are activated. By doing so, all the cobble lifting members are simultaneously raised without interfering with the apron, and the cobbles are lifted above the transport rolls, so that, for example, with a cobble pusher, the cobbles can be lifted without sliding on the transport rolls. It can be extruded to the side and eliminated. Therefore, the scratches on the transfer roll, especially the seizure of the cobbles made of high-temperature stainless steel, which are seen in the conventional example, do not occur. Therefore, prior to restarting operation,
The need for polishing with a grinder or the like of a large number of transport rolls is eliminated, operation can be restarted immediately, and production reduction is suppressed to a minimum. Further, since the cobble lifting member is arranged below the apron, it can be installed easily and can be used by being introduced into an existing rolling facility as it is. Particularly, according to the second aspect of the invention, the cobble lifting member is housed in the apron, so that the space can be saved.

According to the third aspect of the invention, in addition to the effect of the first or second aspect of the invention, when the connecting rod advances and retreats, the third lever rotates, and the third lever rotates integrally with one side. The main shaft on the (skid side) rotates, and the first lever and the second lever on one side rotate integrally with the main shaft. When the second lever on one side rotates, the second lever and the first lever on the other side (cobble pusher side) connected by the connecting rod rotate in conjunction with each other in the same direction. When both first levers rotate,
Both ends thereof are raised and lowered, and all the cobble lifting members can be raised and lowered through the respective links. Since all of the mechanism for holding and elevating the cobble lifting member is a link mechanism, the operation is smooth and reliable, and most of them are arranged below the apron, so that they can be made compact and easy to install.

Further, according to the invention described in claim 4,
In addition to the effect of the invention of claim 3, when the drive hydraulic cylinders corresponding to the respective blocks are retracted (advanced) by, for example, the central operation panel, all the connecting members are thereby passed through the respective base end connecting members. , The connection assisting members retreat (advance) all at once. As the connecting members move backward (advance), the direction changing levers rotate, and the connecting rods connected to the levers move backward (advance) all at once.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. 1 is a plan view of the entire apparatus including a transport roll row, FIG. 2 is a cross-sectional view of the cobble lifting member holding / lifting mechanism, FIG. 3 is a side view showing a connecting rod of the cobble lifting member holding / lifting mechanism, and FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 2, showing the lowered state of the cobble lifting member.
FIG. 5 is a plan view showing a cobble lifting member and a cobble lifting member holding / elevating mechanism.

To give the main structure of the embodiment of the present invention, the adjacent transport rolls 1 of the plurality of transport roll rows 1 are listed.
a, 1a, a cobble lifting member 3, which is arranged below the upper surface of an apron 2, holds and lifts each cobble lifting member 3, and a cobble lifting member holding / elevating mechanism 4, and a plurality of cobble lifting members. A cobble lifting member drive mechanism 5, which drives the members 3 to move up and down all at once.
It has.

First, the apron 2 provided between the adjacent transport rolls 1a will be described. Apron 2 is
Improving the sheet passing property of the material 90 to be rolled traveling on the plurality of transport rolls 1a (from the upstream transport roll 1a to the downstream transport roll 1 so that the leading end does not fall between the transport rolls 1a, 1a).
a plurality of strips extending in the traveling direction Y of the material 90 to be rolled, which are arranged at appropriate intervals in a direction perpendicular to the traveling direction Y of the material 90 to be rolled (horizontal direction X). It has an apron strip 2a. As an example thereof, as shown in FIG. 2, the apron 2 is composed of a plurality of plate-like bodies, and the center part is hollowed out leaving an appropriate width on the upper and left and right sides of each plate-like body, and an apron strip is formed on the upper part. 2a is formed, and an apron 2 having a central cavity 2b in which a cobble lifting member 3 can be housed is used. The upper surface of the apron 2 is slightly lower than the top of the transport roll 1a and is substantially horizontal.

As shown in FIG. 1, one side (left side) L in the running direction Y of the rolled material 90 of each apron 2 is
A cobble pusher 7 for pushing the cobble 90 is provided, and a skid 8 on which the discharged cobble 90 is placed is provided on the other side (right side) R. In addition, a large number of cobble pushers 7 arranged corresponding to each apron 2 are simultaneously
It is configured to be operable by the base drive device (not shown).

Next, the cobble lifting member 3 housed in the inner cavity 2b of the apron 2 will be described. The cobble lifting member 3 includes a plurality of cobble support portions 3a capable of moving up and down the gap between the adjacent apron strips 2a, 2a, and
All of the plurality of cobble support portions 3a are integrally connected at the lower portion, and the upper end surface of the cobble support portion 3a is prevented from coming into contact with the rolled material 90 traveling on the transport roll 1a during normal operation. Are held so that they are slightly lower than the upper surface of each apron 2, rise during cobble discharge, and are higher than the top of the transport roll 1a. Cobble lifting member 3
As an example, in FIG. 2, a single plate that is perpendicular to each plate and extends in the left-right direction X so as to cross the apron 2 is used. Moreover, in order to prevent the cobble lifting member 3 from interfering with the apron strips 2a at the time of raising and lowering, as shown in FIG. 4, the portions corresponding to the apron strips 2a are hollowed out like comb teeth.

Thirdly, holding the cobble lifting member 3
The lifting mechanism 4 will be described. As shown in FIGS. 2 to 5, below the left and right ends of the cobble lifting member 3,
A spindle 4a which is parallel and horizontal to the traveling direction Y of the material 90 to be rolled.
Is supported. A first lever 4b that rotates integrally with the main shaft 4a is vertically provided at the center of the main shaft 4a, and links 4c are respectively connected between the first lever 4b and the left and right ends of the cobble lifting member 3. , A 6-bar parallel movement mechanism is formed. Actually, the links are paired on the front and back sides, and are connected so as to sandwich the cobble lifting member 3 and the first lever 4b from both sides.

Further, another second lever 4d, which rotates integrally, is connected to one end of each main shaft 4a, and as shown in FIGS. 3 and 5, the left and right second levers 4d, 4d.
A horizontal connecting rod 4e is connected between them to form a four-bar parallel movement mechanism. As a result, when one of the first levers 4b rotates, the one second lever 4d interlocks via the corresponding main shaft 4a, and the other second lever 4d and the first lever 4b connected by the connecting rod 4e move. It rotates in conjunction with the same direction. Further, the spindle 4 on one side R (the side of the skid 8)
A third lever 4f is vertically installed (connected) so as to rotate integrally with the other end of a, and at the other end of the third lever 4f, a connecting rod 4g that extends toward the skid 8 and moves back and forth in the left-right direction X is provided. It is connected.

As described above, when the connecting rod 4g moves back and forth,
The third lever 4f rotates, whereby the main shaft 4a rotates, the first levers 4b, 4b interlock and rotate, and both ends thereof move up and down, whereby the links 4c, 4 respectively.
The cobble lifting member 3 is configured to move up and down via c. Further, as shown in FIG. 5, the cobble lifting member 3
The left and right ends are fitted to the guides 2c, 2c so as not to shake in the front-rear direction and the left-right direction when moving up and down.

Finally, a cobble-lifting member drive mechanism 5 for simultaneously raising and lowering a large number of cobble-lifting members 3 provided between the adjacent conveying rolls 1a, 1a via the corresponding cobble-lifting member holding / elevating mechanism 4. Will be described.
FIG. 6 is a plan view showing the cobble lifting member drive mechanism 5. A horizontal substantially L-shaped plate-shaped direction changing lever 5a is provided, and a corner portion (Kaname portion) is rotatably connected to the other end of the connecting rod 4g, and one end thereof is rotatably attached to the skid 8. It is supported. Also, the other end of the direction conversion lever 5a is
It is rotatably connected to a connecting member 5b parallel to the traveling direction Y of the material 90 to be rolled. With the above configuration, the axial movement of the connecting member 5b is converted into the horizontal movement X of the connecting rod 4g (direction perpendicular to the connecting member 5b) via the direction changing lever 5a. To be done.

The connecting members 5b corresponding to the connecting rods 4g of the respective cobble lifting members 3 are connected to each other via the auxiliary connecting members 5c in parallel to the traveling direction Y of the material 90 to be rolled. Moreover, the base end connecting member 5d is connected to the base end of the connecting member row K formed by connecting the plurality of connecting members 5b and the connecting auxiliary member 5c. A drive hydraulic cylinder 5e is rotatably connected to each of the base end connecting members 5d, and when the drive hydraulic cylinder 5e advances and retracts, the movement of the drive hydraulic cylinders 5e of all the connecting members 5b of the connecting members 5b continues. Converted into a forward / backward movement parallel to the traveling direction Y, and the direction conversion lever 5
All the connecting rods 4g move back and forth in the left-right direction X all at once through a. The majority of each cobble lifting member drive mechanism 5 is housed below the skid 8 (not shown).

Further, in general, it is difficult to drive all the cobble lifting members 3 by one driving hydraulic cylinder 5e due to the capability of the driving hydraulic cylinder 5e to lift the cobble 90. The connecting member row K and the cobble lifting member 3 are made into blocks, and the central operating panel 5f causes the driving hydraulic cylinders 5e corresponding to the respective blocks to move back and forth all at once, whereby all the cobble lifting members 3 are moved.
Are configured to move up and down all at once.

The operation will be described. When the operation is stopped due to a trouble in the operation of the hot rolling equipment, the central control panel 5f causes the drive hydraulic cylinders 5e corresponding to the respective blocks to retreat all at once. , All the connecting members 5b and the auxiliary connecting members 5 through the respective proximal end connecting members 5d.
c retreats. As the connecting members 5b move backward, the direction changing levers 5a rotate and the connecting rod 4g moves backward.

FIG. 7 is a sectional view taken along the line AA of FIG. 2 showing the raised state of the cobble lifting member 3. As the connecting rods 4g retreat, the main shaft 4a rotates via the third lever 4f, and the first lever 4b and the second lever 4d on the skid 8 side rotate integrally with the main shaft 4a. When the second lever 4d on the skid 8 side rotates, the second lever 4d on the cobble pusher 7 side and the first lever 4b connected by the connecting rod 4e rotate in conjunction with each other in the same direction, and both tips rise. At the same time, all the cobble lifting members 3 are lifted via the links 4c and 4c, respectively.

Along with this, the cobble 9 on the transport roll 1a
0 is lifted above the transport roll 1a. The cobbles 90 lifted above the transport roll 1a are extruded onto the skid 8 by all the cobble pushers 7 without sliding on the transport roll 1a and eliminated. Cobble 9
After 0 is removed and placed on the skid 8, the driving hydraulic cylinders 5e are simultaneously advanced by the central operation panel 5f, the lifting plate 3 is simultaneously lowered to the original state, and the transport roll row 1 Immediately returns to the state where it can resume operation. The removed cobble 90 is usually cooled on the skid 8 and then cut and reused as scrap.

[0026]

As described above, according to the invention as set forth in claim 1 or 2, scratches on the transport roll, particularly seizure of cobbles made of high-temperature stainless steel on the transport roll, which are seen in the conventional example, occur. There is nothing to do. Therefore, prior to resuming the operation, it is not necessary to grind a large number of the transport rolls with a grinder or the like, and the operation can be resumed immediately, and the production reduction due to the trouble of the rolling equipment is suppressed to the minimum. Also,
Since the cobble lifting member is arranged below the upper surface of the apron, it can be installed easily and can be used by being installed in an existing rolling facility as it is. Particularly, according to the second aspect of the invention, the cobble lifting member is housed in the apron, so that the space can be saved.

According to the invention described in claim 3, according to claim 1
Alternatively, in addition to the effect of the invention of 2, the cobble lifting member holding / elevating mechanism is entirely a link mechanism, so that the operation is smooth and reliable, and the size can be reduced. Further, since it is housed below the upper surface of the apron together with the cobble lifting member, no particular installation place is required.

According to the invention of claim 4, claim 3
In addition to the effects of the invention of, for example, by the central operation panel,
The drive hydraulic cylinders corresponding to the respective blocks are retracted, so that all the connecting members and the auxiliary connecting members are simultaneously retracted via the respective proximal end connecting members. Moreover, as the connecting members move backward, the direction changing levers rotate and the connecting rods move backward simultaneously, so that a large number of cobble lifting members can be moved up and down at the same time, and operation control is extremely easy. Moreover, most of them are stored under the skid, and there is almost no need for a new installation place.

[Brief description of drawings]

FIG. 1 is a plan view of an entire apparatus including a cobble lifting device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a cobble lifting member and a cobble lifting member holding / elevating mechanism of the cobble lifting device according to the embodiment of the present invention.

FIG. 3 is a side view showing a connecting rod of a cobble lifting member holding / lifting mechanism.

FIG. 4 is an AA of FIG. 2 showing a lowered state of a cobble lifting member of a cobble lifting device according to an embodiment of the present invention.
It is sectional drawing.

FIG. 5 is a plan view of a cobble lifting member and a cobble lifting member holding / elevating mechanism of the cobble lifting device according to the exemplary embodiment of the present invention.

FIG. 6 is a plan view showing a cobble lifting member drive mechanism of the cobble lifting device according to the exemplary embodiment of the present invention.

7 is a cross-sectional view taken along the line AA of FIG. 2 showing a raised state of a cobble lifting member.

[Explanation of symbols]

 1 Conveyor Roll Row 1a Conveyor Roll 2 Apron 2a Apron Article 2b Medium Cavity 2c Guide 3 Cobble Lifting Member 3a Cobble Support 4 Cobble Lifting Member Holding / Elevating Mechanism 4a Main Spindle 4b First Lever 4c Link 4d Second Lever 4e Connecting Rod 4f Fourth Three levers 4g Coupling rod 5 Cobble lifting member drive mechanism 5a Direction conversion lever 5b Coupling member 5c Coupling auxiliary member 5d Base end coupling member 5e Driving hydraulic cylinder 5f Central operation panel 7 Cobble pusher 8 Skid 90 Rolled material or cobble K coupling member row X left-right direction Y running direction of rolled material

Claims (4)

[Claims] 1. A cobble lifting member, which is provided between adjacent transport rolls and is disposed below an upper surface of an apron for guiding a traveling material to be rolled from an upstream transport roll to a downstream transport roll, and its cobble. A cobble lifting member holding / elevating mechanism for holding and lifting the lifting member, and a cobble lifting member driving mechanism for driving a large number of cobble lifting members to move up and down all at once via the corresponding cobble lifting member holding / lifting mechanism. And, each apron is provided with a plurality of apron strips extending in the traveling direction of the material to be rolled, which are arranged at appropriate intervals in a direction perpendicular to the traveling direction of the material to be rolled, and Each of the above-mentioned cobble lifting members is provided with a plurality of cobble support parts capable of moving up and down the gap between the adjacent apron strips, and all of the plurality of cobble support parts are integrally formed at the lower part. Are combined and, during normal operation,
The upper end surface of the cobble support part is slightly lower than the upper surface of each apron so that it does not come into contact with the material to be rolled traveling on the transfer roll. A cobble lifting device for hot rolling equipment, characterized in that 2. Each apron comprises a plurality of plate-shaped bodies,
The central portion is hollowed out, leaving an appropriate width on the upper and left and right sides of the plate-like body, and an inner cavity for accommodating the cobble lifting member is formed in the central part of the apron, and each cobble lifting member is It consists of a single plate perpendicular to the plate-like body, extends in the left-right direction so as to cross the apron vertically, and the parts corresponding to each plate-like body are shaped like comb teeth so as not to interfere with the apron when moving up and down. The cobble lifting device for hot rolling equipment according to claim 1, wherein the cobble lifting device is hollowed out. 3. The cobble lifting member holding / lifting mechanism,
A first lever that is integrally rotated is supported vertically below each of the left and right ends of the cobble lifting member, and is parallel to the traveling direction of the material to be rolled. A link is connected between each of the left and right ends of the lifting member, and another second lever that integrally rotates is connected to one end of each main shaft, and a horizontal connecting rod is provided between the left and right second levers. And a third lever that rotates integrally is connected to the other end of one main shaft of the cobble lifting member, and the other end of the third lever extends to the skid side opposite to the cobble pusher side to The connecting rod that advances and retracts in the direction is connected,
3. The heat according to claim 1, wherein when the connecting rod advances and retracts, the third lever, the main shaft, the first lever and the second lever are interlocked to rotate and the cobble lifting member moves up and down. Cobble lifting device for hot rolling equipment. 4. A horizontal substantially L-shaped plate-like direction in which one end of the cobble lifting member drive mechanism is rotatably supported at the other end of each connecting rod and the corners are rotatably connected. Conversion lever,
A connecting member that is rotatably connected to the other end of the direction conversion lever and that is parallel to the running direction of the material to be rolled, a connecting auxiliary member for connecting the two connecting members to the running direction of the material to be rolled, A plurality of connecting members, a base end connecting member connected to the base end of a connecting member row formed by connecting the connecting auxiliary members, and a drive hydraulic cylinder in which each base connecting member is rotatably connected. When the drive hydraulic cylinder advances and retreats, all connecting members connected to it advance and retreat, whereby all the direction conversion levers rotate, the operating directions are changed, and all the connecting rods move to the left and right. The cobble lifting device for a hot rolling facility according to claim 3, wherein the cobble lifting device is configured to move back and forth all at once.