JP4994906B2 - Slab guide device - Google Patents

Description

  The present invention relates to a slab guide device for guiding a slab transported on a pass line in a continuous casting facility.

Conventionally, in a continuous casting facility, a slab guide device such as a plurality of roll segments is provided from below the mold, and a slab transport path (hereinafter referred to as a pass line) is provided by a plurality of pairs of rolls of the slab guide device. Is formed.
Among the slab guide devices, in particular, in the light reduction device provided at the end of the pass line for the purpose of eliminating the center segregation of the slab, the first roll and the second roll that moves close to and away from the first roll It is important to densely deploy the roll pairs consisting of (deploy with a narrow roll pitch). This is because, if the roll pitch is large, bulging occurs in the slab, and not only the original effect of light pressure cannot be obtained, but also the quality of the slab itself is impaired.

For example, in Patent Document 1 and Patent Document 2, a reference frame in which a plurality of first rolls are densely arranged upwards is opposed to a tilt frame in which a plurality of second rolls are densely arranged downwards, and the distance of the tilt frame to the reference frame In addition, a light reduction device is disclosed in which the roll interval (referred to as the interval between the first roll and the second roll) is adjusted to a predetermined roll interval by adjusting the inclination.
By the way, the slabs conveyed through the pass line each have an optimum roll interval in the light reduction region, and it is necessary to change the roll interval for each slab conveyed to achieve such a roll interval. There is. Further, such an optimal roll interval changes slightly every moment depending on the cast steel type, casting speed, secondary cooling history, etc., and it is necessary to change the roll interval according to the situation. Furthermore, the roll interval according to the situation must be set even in a non-steady state (for example, a change in casting speed).

On the other hand, in the light reduction devices disclosed in Patent Document 1 and Patent Document 2, it is possible to change a plurality of pairs of roll intervals into an inclined shape at once, ) Since it can only be changed in units, it is extremely difficult to set the optimum roll interval as described above.
As a device capable of solving such a problem, Patent Document 3 discloses a light reduction device in which a roll interval adjusting means is provided in each of a plurality of second rolls attached to a tiltable upper frame.

By the way, when the slab is being reduced by the light reduction device, a pulling force is applied to each roll toward the downstream side of the pass line with the contact portion between each roll and the slab as an action point. On the other hand, the light reduction device disclosed in Patent Document 3 is a hanging structure in which each second roll is overhanged downward from the upper frame, and has a structure that is vulnerable to such a pulling force. . For this reason, the entire light pressure reducing device such as the upper frame is deformed by the pulling force, and there is a possibility that not only the roll interval between each pair of rolls but also the interval between the roll pairs will gradually become crumpled.
In order to avoid such a fragile structure, a reduction device has been proposed in which an upper frame and a lower frame are connected and supported by flat plate-like side frames provided on both sides of the lower frame (see, for example, Patent Document 4). .

In the reduction device, a plurality of vertically elongated openings provided in the side frame accommodates a lower housing that pivotally supports the first roll of the roll pair and an upper housing that pivotally supports the second roll. The movement of the upper housing to the downstream side of the pass line is regulated by regulation of the opening side edge, and is guided in the vertical direction. Further, the restriction of the upper housing in the roll axis direction is guided by a key plate provided on the side frame and fitted to the upper housing.
JP 2003-290893 A JP 2001-113349 A Japanese Patent Laid-Open No. 5-8004 JP-A-8-71719

However, according to the rolling reduction device disclosed in Patent Document 4, when the roll pitch is shortened so as to densely arrange the roll pairs, the drawing force from the slab is most likely to act between the openings of the side frame. Therefore, the width of the bridge portion located at the position inevitably has to be reduced, which causes a problem that the rigidity of the entire apparatus in the pass line direction is remarkably lowered.
Accordingly, the present invention provides a slab guide device in which a plurality of roll pairs can be densely arranged, the roll interval can be freely changed for each roll pair, and the rigidity of the entire apparatus can be secured. It is intended to provide.

In order to achieve the above object, the present invention takes the following technical means.
That is, the technical means for solving the problems in the present invention are:
A slab guide device for conveying a slab on a pass line of a continuous casting facility with a roll stand having a plurality of pairs of rolls,
The roll stand includes a plurality of roll units having a pair of rolls, and a common frame that supports the plurality of roll units in a row by connecting lower portions of the plurality of roll units. Prepared,
Each roll unit includes a first roll assembly formed by pivotally supporting a first roll disposed on the common frame side with respect to the slab pass line by a housing, and a first roll assembly that can be moved close to and away from the first roll assembly. A second roll assembly in which two rolls are pivotally supported by a housing; and a driving means for applying a driving force to the second roll assembly to approach and separate the first roll assembly;
Tie rods that protrude upward from the common frame are disposed between adjacent roll units, and the housings of the second roll assemblies of these adjacent roll units are both in sliding contact with the tie rods.

According to this, a tie rod is disposed between adjacent roll units, and a housing constituting the second roll assembly of the roll unit on one side when viewed from the tie rod is fitted to the tie rod, and the other side The housing constituting the second roll assembly of the roll unit is also fitted to the tie rod. That is, adjacent roll units share a tie rod positioned between them, and the roll units can be arranged opposite to each other via the tie rod. As a result, the roll units can be densely arranged.
Moreover, since the drive means is provided for every roll unit, the space | interval of a 1st roll and a 2nd roll can be changed suitably for every roll unit.

Further, since the second roll assembly of each roll unit is supported by the tie rods, the pulling force acting in the pass line direction on each second roll assembly when the slab is being pressed is received by each tie rod, thereby The overall rigidity can be increased.
Moreover, it is preferable that the housing of any one or both of the said 1st roll assembly and a 2nd roll assembly is provided with the groove part which slidably contacts with the said tie rod.
According to this, the tie rod fits into the groove portion of any housing of the adjacent roll units, and thereby the distance between the two housings can be further shortened. As a result, roll units, that is, roll pairs can be more densely arranged.

The tie rod is preferably formed in a long columnar shape or cylindrical shape, and the diameter or outer diameter of the cross section perpendicular to the axis is preferably smaller than the width of the housing in the roll axis direction.
According to this, a tie rod can be formed long and a roll unit, ie, a roll pair, can be arranged more densely. Further, the tie rod can be easily formed with a general-purpose small machine tool or the like.
Preferably, the plurality of tie rods protruding from the common frame are connected to each other by a connecting member at a position farther than the second roll assembly as seen from the common frame.

According to this, since the front-end | tip part of each tie rod will mutually be connected, the rigidity of the whole roll stand can further be improved.
In addition, each housing of the first roll assembly is preferably fixed in a state of being fitted to the tie rod while being grounded to the common frame.
According to this, the first roll assembly of each roll unit is also supported by the tie rod, and the pulling force acting on each first roll assembly in the slab conveying direction when the slab is being pressed is received by the tie rod. As a result, the rigidity of the entire apparatus can be further increased.

  Thereby, the roll space | interval of each roll pair can be adjusted suitably separately.

  According to the slab guide device of the present invention, a plurality of roll pairs can be densely arranged, the roll interval can be freely changed for each roll pair, and the rigidity of the entire apparatus can be ensured. it can.

Hereinafter, an embodiment in which a slab guide device according to the present invention is implemented as a light reduction device 1 will be specifically described with reference to the drawings.
As shown in FIG. 6, in the continuous casting equipment 100 having the light reduction device 1 according to the present invention, a tundish 102 is disposed below the ladle 101, and a mold 103 is disposed below the tundish 102, A secondary cooling zone 104 composed of a plurality of support rolls and cooling sprays extends in a curved shape from below the mold 103, thereby forming a pass line L starting from the lower end of the mold 103. Further, a light reduction device 1 is provided at the end of the pass line L.

The molten steel T flowing into the tundish 102 from the ladle 101 and the dummy bar provided at the tip of the molten steel T are upstream of the pass line L by a slab drawing device 104a or the like provided in the middle of the secondary cooling zone 104. Is passed through the pass line L. The molten steel T is cooled by the secondary cooling zone 104 while passing through the pass line L, and then cut to an appropriate length by a cutting device (not shown), thereby forming a slab. The
The light reduction device 1 is a device for applying a reduction load to the slab conveyed through the pass line L to eliminate the center segregation of the slab, and applies a reduction load to the slab in parallel to each other. A roll stand 3 having a plurality of roll pairs 2 and a roll rotating device 9 for applying a rotational driving force to one or both of the roll pairs 2 are provided.

In addition, it is also possible to set it as the free roll which does not make rotational force provision any or all of each roll pair 2 of the roll stand 3, without providing the roll rotating apparatus 9. FIG.
As shown in FIGS. 1 to 3, the roll stand 3 has a common frame 4 and a plurality of roll units 6 (5 in the present embodiment) that are arranged on the common frame 4 with the roll pair 2. And a tie rod 5 disposed between the roll units 6 and a connecting member 8 for connecting the tie rods 5.
The common frame 4 includes a pair of support plates 41 that extend along the pass line L and face each other, and a pair of connection plates 42 that connect both ends of the pair of support plates 41 in the longitudinal direction. Each support plate 41 is formed with a plurality of (six in this embodiment) through holes 43 from the end surface closer to the pass line L toward the end surface far from the pass line L at equal intervals. ing.

The support plates 41 facing each other are formed in the same shape, and the number and interval of the through holes 43 are the same. The common frame 4 is formed of a material such as a general structural rolled steel material such as SS400 or a carbon cast steel product such as SC410.
Each support plate 41 is provided with a flange 44 that extends in a direction away from the support plate 41 that faces an end edge portion that is far from the pass line L.
The base frame 10 is provided on the ground plane G, and the flange 44 of each support plate 41 is fastened to the flange 11 provided at the tip of the base frame 10 via a fastener such as a bolt. As a result, the common frame 4 is connected and supported to the ground plane G via the base frame 10.

Each tie rod 5 is formed in a circular pole shape having an outer diameter that is the same as or slightly smaller than the cross-sectional radius of the through hole 43 formed in each support plate 41 of the common frame 4. By making the tie rod 5 into such a shape, the tie rod 5 can be easily manufactured by a general-purpose small machine tool or the like.
It is also possible to fasten the tie rod 5 to the through hole 43 of the common frame 4 by an interference fit. In this case, the outer diameter of the tie rod 5 is slightly larger than the cross-sectional diameter of the through hole 41.

The tie rod 5 is a high strength material such as a general structural rolled steel such as SS400, a mechanical structural carbon steel such as S45C, a mechanical structural alloy steel such as chrome molybdenum steel, a stainless steel such as SUS304 or SUS316, or a commercial product. It is made of steel bars. In addition, a material whose surface is subjected to nitriding treatment or chrome plating treatment can be used as the tie rod 5.
Each roll unit 6 includes a first roll assembly 72 provided on the common frame side, including a first roll 22 and a housing 62 that pivotally supports the first roll 22, a second roll 23, and the second roll A second roll assembly 73 provided on the connecting member side with a housing 63 that pivotally supports the second roll assembly 23, and a drive means 74 that moves the second roll assembly 73 toward and away from the first roll assembly 72. It has.

  The first roll assembly 72 includes housings 62 at both ends of the first roll 22, and each housing 62 has the same length in the pass line direction as the interval between the tie rods 5 erected on the common frame 4. Alternatively, it is formed in a rectangular parallelepiped shape that is slightly smaller, and whose length in the direction orthogonal to the pass line is the same as, slightly larger or smaller than the support plate 41 of the common frame 4 and larger than the cross-sectional diameter of the tie rod 5. Yes. Each housing 62 includes a pivot portion 64 that pivotally supports the first roll 22 via a bearing or the like, and a fitting portion 65 that can be fitted to the tie rod 5 located on the same side.

  As shown in FIG. 3 or FIG. 4A, the fitting portion 65 is configured by forming a groove portion 66 on the end surface 62 a that faces the tie rod 5. The groove 66 is formed by recessing in an arc shape from the end edge closer to the pass line L to the far end edge. The radius of curvature of the arc surface 66 a of the groove 66 is the same as or slightly larger than the radius of the circular cross section perpendicular to the axis of the tie rod 5. Thus, when the housing 62 is disposed between the tie rods 5 erected on the common frame 4, the arc surface 66 a of the groove portion 66 comes into close contact with the surface of the tie rod 5.

  The second roll assembly 73 includes housings 63 on both ends of the second roll 23, and each housing 63 has the same length in the pass line direction as the interval between the tie rods 5 erected on the common frame 4. Alternatively, it is formed in a rectangular parallelepiped shape that is slightly smaller, and whose length in the direction orthogonal to the pass line is the same as, slightly larger or smaller than the support plate 41 of the common frame 4 and larger than the cross-sectional diameter of the tie rod 5. Yes. That is, each housing 63 of the second roll assembly 73 is formed in substantially the same shape as the housing 62 of the first roll assembly 72. Each housing 63 includes a pivotal support portion 67 that pivotally supports the second roll 23 via a bearing or the like, and a fitting portion 68 that can be fitted to the tie rod 5 located on the same side.

The fitting portions 68 are configured by forming groove portions 69 on the end surfaces 63a that face the tie rods 5 respectively. The groove portion 69 is formed by recessing in an arc shape from an end edge closer to the pass line L to a far end edge. The radius of curvature of the arcuate surface 69 a of the groove 69 is the same as the radius of the circular cross section perpendicular to the axis of the tie rod 5. As a result, when the housing 63 is disposed between the tie rods 5 erected on the common frame 4, the arc surface 69 a of the groove 69 comes into slidable contact with the surface of the tie rod 5.
As shown in FIGS. 1 and 3, the driving means 74 is a fluid having a housing 75 of the second roll assembly 73 and a bridge 75 that connects the other housing 63, and a piston rod 76 a that is connected to the bridge 75. A cylinder 76 and supply means (not shown) for supplying fluid to the fluid cylinder 76 are provided.

In this way, by forming each roll unit 6 having the roll pair 2 with the same member / configuration, the common use of the members is achieved.
The connecting member 8 is formed in a flat plate shape having a predetermined thickness, and has the same diameter as the through hole 43 at a position facing the through hole 43 formed in the pair of support plates 41 of the common frame 4. The through-hole 81 is provided. The connecting member 8 is formed with a plurality of (in this embodiment, five) openings 82 penetrating from one flat plate surface to the other flat plate surface.
As shown in FIG. 5, the roll stand 3 is configured by combining the common frame 4, the tie rod 5, the first and second roll assemblies 72 and 73 constituting each roll unit 6, the driving means 74 and the connecting member 8. Has been. In order to form the roll stand 3 with these members, first, the tie rods 5 are inserted through the through holes 43 formed in the support plate 41 of the common frame 4 and fastened. As a result, twelve tie rods 5 are erected on the common frame 4.

  Then, the first roll 22 is pivotally supported by a pair of housings 62 to form a first roll assembly 72, and each housing 62 of the first roll assembly 72 is inserted between adjacent tie rods 5. Thereby, the outer peripheral surface of the tie rod 5 comes into contact with the circular arc surface 66a of the groove portion 66 constituting the fitting portion 65 of each housing 62. Then, the housing 62 is inserted toward the base end portion of the tie rod 5 while sliding the arc surface 66 a with respect to the outer peripheral surface, and is grounded to the upper surface of the support plate 41 of the common frame 4. At this time, the state in which the arc surface 66a of each groove 66 is in contact with the outer peripheral surface of the tie rod 5 is maintained, so there is no possibility that the housing 62 will rattle while the housing 62 is grounded on the support plate 41.

A shim is disposed between the support plate 41 of the common frame 4 and the housing 62 of the first roll assembly 72, and the housing 62 of the first roll assembly 72 is placed on the support plate 41 of the common frame 4 via the shim. Can be grounded. By interposing the shim, the height position of the first roll assembly 72 can be finely adjusted, and the height of the first roll assembly 72 can be matched between the adjacent roll units 6. Become.
Further, the housing 62 of each first roll assembly 72 is supported by the tie rods 5 on both sides and the support plate 41 of the common frame 4, thereby improving the rigidity of the entire roll stand 3.

Next, the second roll 23 is pivotally supported by a pair of housings 63 to form a second roll assembly 73, and each housing 63 is inserted between adjacent tie rods 5. Thereby, the outer peripheral surface of the tie rod 5 comes into contact with the circular arc surface 69a of the groove portion 69 constituting the fitting portion 68 of each housing 63. Moreover, the 1st roll 22 and the 2nd roll 23 by this become the roll pair 2, and mutually oppose.
Then, the bridge 75 of the driving means 74 is attached across the pair of housings 63, 63 of the second roll assembly 73.

Next, the connecting member 8 is made to face the tip of each tie rod 5, and the tie rod 5 is inserted into the through hole 81 of the connecting member 8, and then fastened. Thereby, each tie rod 5 is mutually connected by the front-end | tip part, and the rigidity of the whole roll stand improves.
Then, the fluid cylinders 76 of the driving means 74 are respectively installed in the connecting members 8, and the piston rods 76 a of the fluid cylinders 76 are inserted into the openings 82 of the connecting members 8, respectively, and the tip ends of the piston rods 76 a Connect to bridge 75.
As described above, the five roll units 6 are erected on the common frame 4 in a state where they are arranged in a line. In addition, the roll pairs 2 of the roll units 6 are lined up in this manner, and a pass line L by the roll pairs 2 is formed in the roll stand 3.

After each tie rod 5 is inserted into the connecting member 8 and fastened, the second roll assembly 73 and the first roll assembly 72 are sequentially inserted into the tie rod 5, and the second roll assembly 73 and the connecting member 8 are further inserted. The roll unit 6 is pre-assembled on the connecting member side by providing the drive means 74, and then the tie rods 5 are inserted and fastened into the through holes 43 of the common frame 4 and these are mounted on the common frame 4. Five roll units 6 may be erected.
Further, as shown in FIG. 6, the roll rotating device 9 that applies a rotational force to each pair of rolls 2 includes an electric motor, a reduction gear connected to the electric motor, and a universal connecting the reduction gear and each roll pair 2. A spindle 90 is provided on the side of the roll stand 3. As shown in FIG. 3, the tip end portion of the universal spindle 90 is connected to the protruding portions 22 a and 23 a of the rolls 22 and 23 protruding from the housings 62 and 63 of the roll assemblies 72 and 73.

  According to the present embodiment, the tie rods 5 are positioned between the roll units 6 arranged in a row, and the second roll assembly 73 and the first roll assembly 73 of the roll unit 6 on one side as viewed from the tie rods 5 are arranged. The housings 63 and 62 of the roll assembly 72 are fitted to the tie rod 5, and the second roll assembly 73 of the roll unit 6 on the other side and the housings 63 and 62 of the first roll assembly 72 are also the tie rods. 5 is fitted. That is, the adjacent roll units 6 share the tie rods 5 positioned between them, and the roll units 6 are arranged to face each other via the tie rods 5.

Further, the diameter of the cross section perpendicular to the axial center of the tie rod 5 is smaller than the width of the housings 62 and 63 in the roll axis direction, and the housings 62 and 63 of the roll assemblies 72 and 73 are provided with such tie rods 5. It is fitted to the tie rod 5 in a state of being fitted in the groove portions 66 and 69 that are recessed in a semicircular arc shape. For this reason, the housings 62 and 63 of the roll assemblies 72 and 73 overlap with the tie rods 5, and the interval corresponding to the diameter of the tie rod 5 generated between the housings 62 and 63 of the roll assemblies 72 and 73 is reduced. It will be.
As a result, the roll units 6 are densely arranged, and the roll pitch of each roll pair 2 is shortened as much as possible.
Further, as shown in FIG. 4B, the tie rod 5 is fitted to the cylindrical spaces 64a and 67a for housing the bearings formed in the pivotal support portions 64 and 67 of the housings 62 and 63 of the assemblies 72 and 73, respectively. The concave arcuate groove portions 66 and 69 intersect with each other at right angles. Thereby, the outer peripheral wall surfaces of the cylindrical spaces 64a and 67a and the wall surfaces of the grooves 66 and 69 are closest to each other on the plane Q parallel to the pass line L and passing through the axis of the tie rod 5, and the plane Q Gradually move away from each other toward the outside of the housings 62 and 63. For this reason, the wall thickness between these wall surfaces becomes the thinnest on the plane Q, and the wall thickness increases from the plane toward the outside of the housing. With such a configuration, the thin wall portion does not exist uniformly in the axial direction of the cylindrical spaces 64a and 67a, but the thin wall portion as described above is limited to the portion where the cylindrical space of the bearing and the outer periphery of the tie rod are closest to each other. There is a portion, and the space between the wall surfaces gradually becoming thicker from the thin portion toward the outside of the housings 62 and 63 becomes ribs and contributes to the strength of the housings 62 and 63. Since the strength is ensured by the rib formed between the wall surfaces, the housings 62 and 63 can be formed with the distance S between the wall surfaces as short as possible. 2 can be densely arranged.

In addition, since the driving means 74 is provided for each roll unit 6, the interval (roll interval) between the first roll 22 and the second roll 23 can be appropriately changed for each roll unit 6.
If a normal hydraulic cylinder or the like is employed as the fluid cylinder 76 of the driving means 74, the hydraulic cylinder can be positioned only in the “push” or “pull” position. For this reason, in order to appropriately change the roll interval of the roll pair, for example, a hydraulic cylinder such as a servo cylinder that can be stopped at an arbitrary position of the stroke can be employed. Further, as shown in FIG. 1, a variable height block 78 whose height can be changed is sandwiched between the housing 62 of the first roll assembly 72 and the housing 63 of the second roll assembly 73 of each roll unit 6, It is also possible to change the roll interval by changing the thickness of the height variable block 78.

Further, since the second roll 23 of each roll unit 6 is supported by the tie rod 5, the pulling force that acts on each second roll 23 in the pass line direction when the slab is pressed is received by each tie rod 5. As a result, the rigidity of the entire roll stand 3 against the pulling force is increased.
More specifically, when a slab that is actually conveyed along the pass line L is sandwiched by the roll pair 2 and a rolling load is applied to the slab, the roll rotation axis of the housing 63 of the second roll assembly 73 acts. As a point, a pulling force acts on the tie rod 5 along the pass line direction. In the present embodiment, since the housing 62 of the first roll assembly 72 is fitted and fixed to the tie rod 5 in a state of being grounded to the common frame 4, the support point of the tie rod 5 is the housing of the first roll assembly 72. 62 is the upper surface. Accordingly, in the present embodiment, the first roll assembly 72 is fixed to the tie rod 5 in a state of being separated from the common frame 4, and the upper surface of the common frame 4 is used as a tie rod support point. The distance of the action point is shortened. As a result, in this embodiment, the moment acting on the tie rod 5 is significantly lower than in such a case, and the bending stress or bending deformation to the tie rod 5 due to the pulling force is reduced.

That is, each roll unit 6 of the present embodiment has a structure in which the second roll assembly 73 is cantilevered with a relatively small overhang amount, and the bending of the tie rod 5 with respect to the pulling force acting on the second roll 23 is reduced. It becomes a rigid structure.
In addition, the housing 62 of the first roll assembly 72 of each roll unit 5 is supported in a state where the housing 62 is surrounded by the tie rod 51 and the common frame 4. The rigidity against is improved.
In this embodiment, the roll stand 3 is formed by incorporating a plurality of roll units 6 between a plurality of tie rods 5 erected on the common frame 4, and the roll unit 6 is also a plurality of members. Therefore, even if any of the members constituting these parts is damaged, only the members need to be replaced, so that maintenance and repair work can be easily performed.

In the present embodiment, since the roll unit 6 is arranged between the tie rods 5, the roll stand 3 can be reduced in size and weight, and the roll stand 3 can be easily carried in and out. It is done. In particular, since the housings 62 and 63 of the roll assemblies 72 and 73 are respectively supported by the tie rod 5, the members supporting the housings 62 and 63 can be significantly slimmed (thinned and thinned), and the The member replacement operation is facilitated.
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments.

For example, as shown in FIGS. 7 and 8, the shape of the groove portions 66 and 69 of the fitting portions 65 and 68 of the housings 62 and 63 of the roll assemblies 72 and 73 is a plan view if the tie rod 5 can be accommodated. It may be U-shaped or triangular.
Further, as shown in FIG. 9, it is possible to provide two drive means 74 for each roll unit, and to connect each drive means 74 to the housing 63 of the second roll assembly 73.
According to this, the bridge 75 of the above embodiment can be omitted. When the bridge 75 is viewed as a both-end support beam that supports the housing 63 at both ends, the load is concentrated at the central portion connected to the piston rod 76a of the fluid cylinder 76, so that a large bending load is generated in the bridge 75. It will be a thing. When such a large bending deformation occurs in the bridge 75, the housing 63 connected to the bridge 75 is inclined in a letter C shape, and the axis of the fitting hole 69 of the housing 63 and the axis of the tie rod 5 do not coincide with each other. There is a risk that sliding failure may occur in the fitting portion 68. Therefore, from the viewpoint of securing the rigidity of the bridge 75, the bridge 75 needs to have a member structure having a relatively large beam. However, according to the structure as shown in FIG. 9, the bridge 75 is not necessary. There is no risk of problems.

Further, since the bending moment acting on the connecting member 8 from the fluid cylinder 76 can be distributed to the left and right, the rigidity of the connecting member 8 can be reduced (for example, formed thin).
Furthermore, since the bridge 75 can be omitted and the connecting member 8 can be formed thin, the height of the entire roll stand 3 can be reduced. For this reason, it becomes advantageous as a compact and lightweight roll stand 3 in terms of carrying in / out and the space with the surroundings.
Also, as shown in FIG. 10, among the fitting portions 65 and 68 of the roll assemblies 72 and 73 of the roll unit 6 on the most upstream side with respect to the pass line L, the most upstream side is changed to the groove portions 66 and 69 described above. A configuration using the fitting holes 66b and 69b can also be adopted. According to FIG. 10, among the fitting portions 65 and 68 of the roll assemblies 72 and 73 of the roll unit 6 on the most downstream side with respect to the pass line L, the most downstream side is also fitted with the grooves 66 and 69. Holes 66b and 69b are provided.

Further, the groove portion 66 of the fitting portion 65 of the first roll assembly 72 of each roll unit 6 and the groove portion 69 of the fitting portion 68 of the second roll assembly 73 can be formed in different shapes.
Further, if the drive means 74 is configured so that the second roll assembly 73 can be moved close to and away from the first roll assembly 72, the drive means 74 is arranged at a position different from the above embodiment, such as the side portion of the tie rod 5 and the common frame 4. It is also possible to do.
In addition, the roll diameter of each roll 2 may be different for each roll unit 6.

Further, the light reduction device of this embodiment can be applied to the continuous casting equipment 100 having the vertical type pass line L.
The present invention can be applied not only to the light reduction device 1 but also to other slab guide devices such as a roll segment of the secondary cooling zone 104.

It is a side view of the light reduction device concerning the present invention. It is a top view of this light reduction device. It is a front view of this light reduction device. (A) is principal part sectional drawing which shows a tie rod and its periphery, (b) is a principal part top view which shows a tie rod and its periphery. It is a side view which decomposes | disassembles and shows a light reduction device. It is a side view of a continuous casting facility. It is principal part sectional drawing which shows the 1st modification of a groove part. It is principal part sectional drawing which shows the 2nd modification of a groove part. It is a front view which shows the 1st modification of the light reduction device which concerns on this invention. It is a side view which shows the 2nd modification of the light reduction device which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light rolling device 2 Roll pair 3 Roll stand 4 Common frame 5 Tie rod 6 Roll unit 8 Connecting member 9 Roll rotating device 22 1st roll 23 2nd roll 62 Housing 63 Housing 66 Groove part 69 Groove part 72 1st roll assembly 73 2nd Roll assembly 74 Driving means

Claims (5)

A slab guide device for conveying a slab on a pass line of a continuous casting facility with a roll stand having a plurality of pairs of rolls,
The roll stand includes a plurality of roll units having a pair of rolls, and a common frame that supports the plurality of roll units in a row by connecting lower portions of the plurality of roll units. Prepared,
Each roll unit includes a first roll assembly formed by pivotally supporting a first roll disposed on the common frame side with respect to the slab pass line by a housing, and a first roll assembly that can be moved close to and away from the first roll assembly. A second roll assembly in which two rolls are pivotally supported by a housing; and a driving means for applying a driving force to the second roll assembly to approach and separate the first roll assembly;
The slab guide is characterized in that a tie rod protruding upward from the common frame is disposed between the adjacent roll units, and the housings of the respective second roll assemblies of the adjacent roll units are in sliding contact with the tie rods. apparatus.   2. The cast piece guide device according to claim 1, wherein the housing of one or both of the first roll assembly and the second roll assembly includes a groove portion that is in sliding contact with the tie rod.   The tie rod is formed in a long columnar shape or a cylindrical shape, and a diameter or an outer diameter of a cross section perpendicular to the axis is smaller than a width of the housing in a roll axis direction. Item 3. The slab guide device according to Item 2.   The plurality of tie rods protruding from the common frame are connected to each other by a connecting member at a position farther than the second roll assembly as viewed from the common frame. The slab guide device described. The housing of the first roll assembly of the roll unit is fixed in a state of being grounded to the common frame and fitted to the tie rod. Slab guide device.

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