JP5302025B2 - Light roll guide roll segment - Google Patents

Description

The present invention relates to a guide roll segment in a continuous casting facility for slabs and blooms, and more particularly to a light reduction guide roll segment that performs a light reduction operation to reduce the center segregation of a slab.

2. Description of the Related Art In recent years, continuous casting equipment for slabs and blooms has been demanded for continuous casting equipment having a large cross-section slab size with a larger slab size, aiming to improve the internal quality of the slab such as center segregation. And, in these continuous casting facilities of large cross-section slab size, in order to suppress center segregation, the solidified part of the slab is squeezed from the vertical direction with the upper and lower rolls, or the molten steel flow in the unsolidified part is suppressed, or A light reduction operation is performed in which a central segregation is reduced by pressing the upper and lower solidified portions together to cast a slab having a small cast hole (see, for example, Patent Document 1).

JP 2000-312955 A

In the invention described in Patent Document 1, as the slab size is increased in cross section, the reduction reaction force from the slab at the time of the light reduction operation increases, In addition, it is necessary to design each of the lower rolls to hold the upper roll and to increase the rigidity of the lower frame. In particular, a load that pushes the lower frame downward via the lower roll acts on the lower frame, and the lower frame is connected to the connection parts on both the left and right sides of the lower frame to which the connecting shaft that connects the upper and lower frames is connected. An upward load that lifts the frame upwards acts, and a bending moment acts on the lower frame (see FIGS. 6 and 7A). Therefore, in order to suppress the deformation of the lower frame due to the bending moment generated by these loads, the rigidity of the lower frame is increased by increasing the cross-sectional size of the lower frame, and the weight of the lower frame is increased. As a result, the installation space for installing the lower frame is increased, and the weight of the material for manufacturing the lower frame is increased, resulting in an increase in equipment costs.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lightly reduced guide roll segment that can ensure the required frame rigidity even if it is reduced in weight and size.

The light pressure lower guide roll segment according to the present invention, which meets the above-mentioned object, includes a lower frame, an upper frame, an upper frame, a lower frame, a lower roll, a lower roll, and a lower roll. And a fastening means provided with a connecting shaft for connecting the upper and lower frames, respectively, and the lower frame is a light pressure lower guide roll segment supported by the installation frame,
The lower bearings, which are fixed directly to the installation frame via first support members, respectively, and to which the left and right sides of the lower roll are respectively supported, are fixed directly below the lower frame to which the four connecting shafts are connected. The installation frame is supported directly below the lower frame via a second support member.

In the light pressure lower guide roll segment according to the present invention, it is preferable that the axis of the connecting shaft is in the first support member in plan view.

In the light pressure lower guide roll segment according to the present invention, the lower part of the connecting shaft may penetrate the lower frame and the first support member and be directly fixed to the installation frame.

In the light pressure lower guide roll segment according to the present invention, it is preferable that the second support member is on the left and right of the front side and the rear side of the lower frame.
The second support members on the left and right of the lower frame may be integrated with each other.

In the light pressure lower guide roll segment according to the present invention, the right under the lower frame to which the four connecting shafts are connected is fixed to the installation frame via the first support members, and the left and right sides of the lower roll are supported respectively. Since the installation frame is supported directly below the lower frame to which the lower bearing is mounted via the second support member, a bending moment is applied to the lower frame due to the reduction reaction force generated when the slab is reduced by the upper and lower rolls. Even if it acts, the deformation of the lower frame can be suppressed. For this reason, the rigidity of the lower frame itself can be reduced, and the weight can be reduced along with the downsizing of the lower frame. As a result, the manufacturing cost of the lower frame (light pressure lower guide roll segment) can be reduced, and the installation cost can be reduced by reducing the installation space.

In the light pressure lower guide roll segment according to the present invention, when the axis of the connecting shaft is in the first support member in plan view, even if a bending moment acts on the lower frame, the deformation of the lower frame is reliably suppressed. can do.

In the light pressure lower guide roll segment according to the present invention, when the lower part of the connecting shaft penetrates the lower frame and the first support member and is directly fixed to the installation frame, both the left and right sides of the lower frame before and after the lower frame via the connecting shaft The bending moment acting on the frame is eliminated, and the rigidity of the lower frame itself can be further reduced.

In the light pressure lower guide roll segment according to the present invention, when the second support members are on the left and right sides of the front side and the rear side of the lower frame, deformation of the lower frame due to the rolling reaction force applied to the lower roll can be suppressed.
In addition, when the second support members on the left and right sides of the lower frame are integrated with each other, the deformation of the lower frame due to the rolling reaction force applied to the lower roll can be further suppressed.

It is a front view which shows typically the light rolling guide roll segment which concerns on one embodiment of this invention. It is a side view which shows typically the light pressure reduction guide roll segment. It is an AA arrow sectional view of Drawing 1 showing the relation between the installation frame of the light pressure reduction guide roll segment, and the 1st and 2nd support member. It is AA arrow sectional drawing which shows the relationship between the installation frame of the same light pressure guide roll segment, the 1st supporting member, and the 2nd supporting member which concerns on a modification. (A) is explanatory drawing which shows the fixing method of the lower frame and installation frame of the same light pressure lower guide roll segment, (B) is PP sectional drawing of (A). It is a front view which shows typically the light pressure guide roll segment of a prior art. (A) is explanatory drawing of the bending moment added to the lower frame of the light pressure guide roll segment of a prior art, (B) is explanatory drawing of the bending moment added to the lower frame of the light pressure guide roll segment of this invention.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1 and FIG. 2, the light pressure lowering guide roll segment 10 according to one embodiment of the present invention is configured to lower the upper rolls 12 and 13 respectively while lowering the upper and lower surfaces of the moving slab 11. Fastening means 17 having upper and lower frames 14, 15 that are rotatably held, and connecting shafts 16 that are provided on both the left and right sides of the upper and lower frames 14, 15 and connect the upper and lower frames 14, 15. , 18, 19, and 20, and the lower frame 15 is supported by an installation frame (machine frame or base frame) 22 fixed to a base 21 of a continuous casting facility (not shown) at the lower part.

The upper roll 12 has an axial center of the upper roll 12 in the left-right direction (the cast piece 11) along the movement (casting) direction of the cast piece 11 in the inner region sandwiched between the left and right connecting shafts 16 on the lower surface side of the upper frame 14. It is attached via the upper bearing 23 toward the direction orthogonal to the moving direction of (ie, the width direction of the slab 11). The upper roll 12 is supported by upper bearings 23 on both the left and right sides of the upper roll 12 and an intermediate portion in the axial direction (one place in FIG. 1), and the upper bearing 23 is in the front-rear direction (moving direction of the slab 11). Are attached to an upper bearing mounting portion 24 provided on the lower surface side of the upper frame 14 so that the height position of the axis of each upper roll 12 arranged along the upper frame 12 is the same as that of the slab 11. Yes.

On the other hand, the lower roll 13 is a lower bearing with the axis of the lower roll 13 directed in the left-right direction along the moving direction of the slab 11 in the inner region sandwiched between the left and right connecting shafts 16 on the upper surface side of the lower frame 15. 25 is attached. The lower roll 13 is supported by lower bearings 25 on both the left and right sides of the lower roll 13 and an intermediate portion in the axial direction (one place in FIG. 1). The roll 13 is mounted on a lower bearing mounting portion 26 provided on the lower surface side of the lower frame 15 so that the height position of the axis of the roll 13 is the same as that of the cast piece 11.
One of the plurality of upper and lower rolls 12 and 13 is a drive roll that is connected to a rotating shaft of an electric motor (not shown) and applies a moving force to the slab 11 using a hydraulic cylinder (not shown). Here, the upper rolls 12 and 13 arranged at the center in the front-rear direction are the drive rolls.

As shown in FIG. 1 to FIG. 3, the first receiving portion 30 that is a part of the lower frame 15 to which the four connecting shafts 16 are connected and is provided directly below the connecting portion is a first support. It is fixed to the installation frame 22 through a member 31 (for example, a liner) with a structure described below. Here, the lower part of the connecting shaft 16 is fixed to both the left and right sides of the lower frame 15 using front and rear connecting means (for example, screws or pins), and the axial center position of the connecting shaft 16 is viewed in plan view. It is arranged in the first support member 31. 5A and 5B, a space 30b formed in the first receiving portion 30 and communicated with the outside via the opening 30a, and an opening formed in the installation frame 22. The space portion 22b communicating with the outside through 22a is formed on the opening 30a and the first support member 31 when the first receiving portion 30 is fixed to the installation frame 22 through the first support member 31. The positions of the opening 30a, the through hole 31a, and the opening 22a are adjusted so that the formed through hole 31a and the opening 22a overlap each other to form one communication space. Then, the cotter pin 32 is inserted into the communication space part, and the upper part of the cotter pin 32 existing in the space part 30b is used from the insertion member 30c formed in the side part of the first receiving part 30. The lower part of the cotter pin 32 existing in the space part 22b is fixed to the installation frame 22 via the cotter 34 inserted from the insertion hole 22c formed in the side part of the installation frame 22. As a result, the lower frame 15 is fixed to the installation frame 22.

Moreover, as shown in FIGS. 1 to 3, the first position directly below the lower bearing mounting portion 26 of the lower frame to which the lower bearing 25 that supports the left and right sides of the lower roll 13 on the front side and the rear side of the lower frame 15 is mounted. The two receiving portions 27 are supported by the installation frame 22 via a second support member 28 (for example, a liner).
As shown in FIG. 4, the front and rear second receiving portions 27 of the lower frame 15 can be supported by the installation frame 22 via the integrated second support member 29. As a result, the deformation of the lower frame 15 due to the reaction force applied to the lower roll 13 can be further suppressed.

The fastening means 17 (the same applies to the fastening means 18 to 20) has a lower part fixed to the lower frame 15, a connecting shaft 16 inserted from below into a through hole (not shown) formed in the upper frame 14, and the upper frame 14. And a hydraulic cylinder 35 having a cylinder shaft (not shown) which is provided on the upper surface side and is inserted into the through hole from above and connected to the upper portion of the connecting shaft 16. As a result, the cylinder shafts of the hydraulic cylinders 35 provided at the left and right front positions of the upper frame 14 are contracted with respect to the cylinder shafts of the hydraulic cylinders 35 provided at the left and right rear positions of the upper frame 14, respectively. The upper frame 14 can be tilted forward with respect to the lower frame 15 so that the distance between the upper and lower rolls 12 and 13 gradually narrows from the entry side to the exit side of the slab 11, The slab 11 can be reduced by passing the slab 11 between the upper and lower rolls 12 and 13. Note that the connecting shaft 16 and the cylinder shaft are connected by, for example, a pin, a spherical seat, or a combination of a pin and a spherical seat, so that a bending moment does not act on the connecting shaft 16 when tilted. it can.

Then, the effect | action of the light reduction guide roll segment 10 which concerns on one embodiment of this invention is demonstrated.
FIG. 6 shows a lightly reduced guide roll segment 36 of the prior art. In addition, the same code | symbol is attached | subjected to the same structural member as the light pressure reduction guide roll segment 10, and detailed description is abbreviate | omitted. Here, in the lower frame 37 of the light pressure lower guide roll segment 36, the lower bearing mounting portion 26 of the lower frame to which the lower bearings 25 that respectively support the left and right sides of the lower roll 13 on the front side and the rear side of the lower frame 37 are mounted. The receiving portion 38 directly below is supported by the installation frame 40 via a support member 39 (for example, a liner). Accordingly, in the light pressure lower guide roll segment 36, when the slab 11 is lightly lowered by the upper and lower rolls 12 and 13, the light pressure reaction force is applied to the upper rolls 12 and 13, and the upper frame 14 is attached to the upper frame 14. A load to lift upwards acts. Further, a load that pushes the lower frame 37 downward acts on the lower frame 37. Furthermore, an upward load that lifts the lower frame 37 upward acts on the connecting portions on the left and right sides of the front and rear of the lower frame 37 to which the connecting shaft 16 is connected. As a result, a bending moment M ₁ shown in FIG. 7A acts on the lower frame 37.

However, in the light pressure lower guide roll segment 10, as shown in FIGS. 1 to 3, the first receiving portions 30 directly below the connection portions on the left and right sides of the lower frame 15 to which the connecting shaft 16 is connected are The first receiving portion 30 is mechanically integrated with the installation frame 22 because it is fixed to the installation frame 22 via one support member 31. Therefore, even if the moment acts M ₂ bending shown in FIG. 7 (B) to the lower frame 15, it is possible to reduce than the moment M ₁ bending bending moment M _2, deformation of the lower frame 15 is suppressed . Thereby, the rigidity of lower frame 15 itself can be reduced, and lower frame 15 can be made compact and weight can be reduced.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, the lower part of the connecting shaft may be directly fixed to the installation frame through the lower frame and the first support member. Thereby, most of the upward load for lifting the lower frame upward via the connecting shaft can be carried by the installation frame, and the bending moment acting on the lower frame can be reduced. As a result, the deformation of the lower frame is further suppressed, the rigidity of the lower frame itself can be further reduced, and the lower frame can be made compact (weight reduction).

10: Light pressure lower guide roll segment, 11: Cast slab, 12: Upper roll, 13: Lower roll, 14: Upper frame, 15: Lower frame, 16: Connection shaft, 17, 18, 19, 20: Fastening means, 21 : Base, 22: installation frame, 22a: opening, 22b: space, 22c: insertion hole, 23: upper bearing, 24: upper bearing mounting, 25: lower bearing, 26: lower bearing mounting, 27: 2nd receiving part, 28, 29: 2nd support member, 30: 1st receiving part, 30a: Opening part, 30b: Space part, 30c: Insertion hole, 31: 1st support member, 31a: Through Hole, 32: cotter pin, 33: latching member, 34: cotter, 35: hydraulic cylinder, 36: light pressure lower guide roll segment, 37: lower frame, 38: receiving part, 39: support member, 40: installation frame

Claims (5)

The upper and lower frames are provided on the left and right sides of the upper and lower frames, respectively, while the upper and lower surfaces of the moving slab are pressed down and the lower roll is rotatably held. The lower frame is a light pressure lower guide roll segment supported by the installation frame.
The lower frame, to which the lower bearings, to which the four connecting shafts are connected, is fixed to the installation frame via first support members and the lower bearings are attached to support the left and right sides of the lower roll. A light pressure lowering guide roll segment, wherein the installation frame supports a portion immediately below the frame via a second support member. 2. The lightly reduced guide roll segment according to claim 1, wherein an axis of the connecting shaft is in the first support member in plan view. The light pressure lower guide roll segment according to any one of claims 1 and 2, wherein a lower portion of the connecting shaft passes through the lower frame and the first support member and is directly fixed to the installation frame. Light rolling guide roll segment characterized by The light pressure lower guide roll segment of any one of Claims 1-3 WHEREIN: A said 2nd supporting member is in the right and left of the front side and the rear side of the said lower frame, The light pressure lower guide roll segment characterized by the above-mentioned. . The light pressure lower guide roll segment of Claim 4 WHEREIN: The said 2nd support member in the right and left of the said lower frame is respectively united, The light pressure lower guide roll segment characterized by the above-mentioned.

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