JP2008200727A - Device for drawing-out cast ingot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the size and the weight of a roll stand, and to easily carry out the manufacture, the carrying-in/out work, and the maintenance and repairing work of the roll stand. <P>SOLUTION: The roll stand 3 comprises a plurality of roll units 5 having a pair of pinch rolls 2, and a common frame 4 for supporting a plurality of the roll units 5 arranged in a row. The respective roll units 5 have a pair of side frames 50 arranged on the common frame 4 so as to project in the state positioned on both end sides of a pair of pinch rolls 2, a beam member 55 for connecting the tip end portions of a pair of the side frames 50 projecting from the common frame 4, and a pair of the pinch rolls 2, and further have a roll pivotally mounting mechanism 61 for pivotally supporting a pair of the pinch rolls 2 between a pair of the side frames 50 so as to approach to and separate from each other. The beam members 55 of the neighboring roll units 5 are connected to each other via connecting means 8 so as to keep the distances between them constant respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mold drawing apparatus constituting a continuous casting facility.

  In general, in a continuous casting facility, a plurality of slab drawing devices are arranged at predetermined intervals on a linear or curved path line extending from below the mold. The slab drawing device is generally configured by pivotally supporting a pair or a plurality of pairs of pinch rolls facing each other via a pass line, and a slab or dummy bar (hereinafter referred to as a cast bar) conveyed on the pass line by these pinch rolls. Is a device that pulls out slabs from the upstream side of the pass line to the downstream side by rotating each pinch roll toward the downstream side of the pass line in this state, and between each pair of pinch rolls A roll stand including an expansion / contraction device that expands / contracts the interval and a roll rotation driving device that rotationally drives each pair of pinch rolls are provided.

In this type of roll stand, at least two to three pairs of pinch rolls are provided, and a frame that pivotally supports the plurality of pairs of pinch rolls includes a pair of side plate portions disposed opposite to each other, and the pair of paired pin plates. It is formed in the shape of a square tube integrally provided with connecting portions that connect the upper and lower ends of the side plate portions. The pair of side frames is formed with a rectangular opening that accommodates a housing that pivotally supports each pinch roll. Moreover, the housing which pivotally supports the pinch roll located in one connection part side is connected with the beam 75, and is arrange | positioned so that raising and lowering is possible in the said opening part. Therefore, when the beam 75 is moved up and down by the driving means, the housing moves up and down in the opening, thereby expanding and reducing the distance between each pair of pinch rolls (see, for example, Patent Document 1 and Patent Document 2).
JP-A-62-232019 JP-A-2-32062

  However, according to the slab drawing device, the bottom surface of the opening of the side plate portion serves as an installation portion of the housing that pivotally supports the other pinch roll, and the opposite side surfaces slide the housing that pivotally supports the upper pinch roll. Therefore, the shape of each opening is not only complicated, but also requires high processing accuracy. In addition, since the housings of a plurality of pairs of pinch rolls are supported by an integrally structured frame, the frame itself is heavy and long. For this reason, the frame must be formed by a method in which the frame base material is machined with a large machine tool, which makes it difficult to manufacture the frame with a general-purpose small machine tool. There was a problem of requiring labor.

In addition, in order to reduce the crimping force of each pair of pinch rolls against the cast piece, etc. while maintaining the drawing speed and pulling force, the number of pinch rolls is reduced by the amount by which the crimping force between each pair of pinch rolls is reduced. Although it is desirable to increase the number, the frame and the roll stand also increase in size and weight.
In addition, since the roll stand installed in the secondary cooling zone is used in splashed water and steam, each member constituting the roll stand is damaged (corroded) in a relatively short period of time. For this reason, the roll stand is periodically taken off-line to perform maintenance and maintenance, and then brought online after maintenance, but due to the increase in size and weight of the roll stand as described above, There is also a problem that maintenance work becomes difficult.

Further, if damage to the frame progresses, the frame itself must be replaced with a new frame, and replacement work is not easy with a large frame as described above. Moreover, even if a part of the frame is damaged, the entire frame needs to be replaced, so that maintenance efficiency is poor.
Accordingly, the present invention is to provide a slab drawing device that can reduce the size and weight of the roll stand and facilitate the manufacture, loading / unloading work, and maintenance / repair work of the roll stand.

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 drawing apparatus having a roll stand having a plurality of pairs of pinch rolls for drawing a slab of a continuous casting facility,
The roll stand includes a plurality of roll units having a pair of pinch rolls, and a common frame that supports the plurality of roll units in a row.
Each roll unit is a beam that connects a pair of side frames that are arranged in a projecting manner to the common frame in a state of being positioned on both ends of the pair of pinch rolls, and a pair of side frames that project from the common frame. A member, and a roll support mechanism that has the pair of pinch rolls and pivots the pair of pinch rolls along the pair of side frames so as to be close to and away from each other.
The beam members of adjacent roll units are connected to each other via connecting means that maintain a constant distance from each other.

According to this, the roll stand is formed by connecting a plurality of roll units by the common frame and the connecting means. Therefore, after the roll units are formed on the common frame, the roll stands are assembled by connecting the roll units, and the roll stand can be easily assembled. Moreover, since the configuration of each roll unit is the same, parts can be shared and production efficiency can be improved.
Further, since the roll stand is formed by assembling the respective members in this way, the enlargement of the respective members can be avoided, and the manufacture of the respective members can be formed by a general-purpose small machine tool. In addition, the manufacturing accuracy of each member can be improved.

Further, since the roll stand is formed by assembling each member, even if any member is damaged, only the member can be replaced. Therefore, maintenance repair work can be easily performed.
In addition, since the roll units are arranged side by side, a single large frame as in the above-described conventional example that supports all pairs of pinch rolls becomes unnecessary, thereby reducing the size and weight of the roll stand. As a result, the roll stand can be easily carried in and out.

In addition, the roll pivot mechanism is arranged on the beam member side of the first roll assembly formed by pivotally supporting one pinch roll disposed on the common frame side of the pass line with a housing. It is preferable to include a second roll assembly in which the other pinch roll is pivotally supported by a housing, and drive means for moving the second roll assembly toward and away from the first roll assembly.
According to this, since the roll pivot mechanism is also formed by the first roll assembly, the second roll assembly, and the driving means, even if any member constituting these is damaged, only the member is replaced. Therefore, it is economical and maintenance and repair work can be easily performed.

The pair of side frames includes a pair or a plurality of pairs of tie rods arranged on one end side and the other end side of the pair of pinch rolls, and the second roll assembly includes one end side of the other pinch roll and The other end side is pivotally supported by the housing, and either one or both of the housings have a fitting portion slidably fitted to at least one of one or a plurality of tie rods located on the same side. It is preferable to provide.
According to this, since each side frame is formed of one or a plurality of tie rods, the side frame can be slimmed (thinned and slimmed), and the roll stand can be further reduced in weight.

In addition, the fitting portion includes a fitting hole that penetrates from one end surface to the other end surface of the housing and loosely fits to each tie rod, and a dust seal is provided at an opening edge of each fitting hole. Each is preferably deployed.
According to this, intrusion of dust or the like in the ambient atmosphere toward the fitting hole that forms the fitting portion of the housing of the second roll assembly is prevented. For this reason, the sliding contact surface between the fitting portion and the tie rod is kept clean, and the housing and the tie rod are prevented from being damaged when the housing slides with respect to the tie rod with dust or the like sandwiched between them. be able to. In addition, it prevents the serious trouble that the housing of the second roll assembly is fixed to the tie rod due to dust being caught on the sliding contact surface between the fitting portion and the housing, and eventually it becomes impossible to hold the slab or the like. be able to.

In addition, each housing of the second roll assembly is preferably connected to a common or different driving means.
If the housings are connected to the common driving means, the housings can be driven in synchronism with one driving means, which simplifies the configuration of the apparatus and reduces the number of components.
Further, when different driving means are connected to each housing, each driving means can be smaller than the above-mentioned common driving means, and the entire apparatus can be reduced in size. .

The first roll assembly is formed by pivotally supporting one end side and the other end side of the one pinch roll with a housing, and each housing is located on the same side in a state of being grounded to the common frame. Alternatively, it is preferably fixed in a state of being fitted to at least one of the plurality of tie rods.
When the slab that is actually conveyed along the pass line is sandwiched between each pair of pinch rolls, the pulling force toward the downstream side of the pass line is applied to the tie rod with the roll rotation axis of the housing of the second roll assembly as the point of action. Will act. According to the above configuration, since the housing of the first roll assembly is fitted and fixed to the tie rod while being grounded to the common frame, the support point of the tie rod is the end surface on the pass line side of the housing of the first roll assembly. It becomes. Thereby, the distance between the support point and the action point of the drawing force can be made short, and the moment to the tie rod by the drawing force can be made small.

Further, since the housing of the first roll assembly of each roll unit is supported in a state where the three sides are surrounded by the tie rod and the common frame, the rigidity of each roll unit in the slab drawing direction is also improved.
Moreover, it is preferable that the straight line which connects the rotating shaft center of a pair of roll of each roll unit cross | intersects perpendicularly | vertically with respect to the said path line formed in a curve.
According to this, the roll stand formed by such a configuration can be disposed on the curved portion of the pass line by the curved continuous casting equipment.

Further, the coupling means includes a fitting member having a pair of restricting portions that are fitted to the beam members of the roll units adjacent to each other and restrict the movement of the beam members in the proximity direction or the separation direction, and the fitting member It is preferable to provide a pressing member that presses each beam member toward each regulating portion.
According to this, since the beam member of each roll unit is clamped between the fitting member and the pressing member, each beam member is firmly connected to the connecting means and the interval between adjacent beam members is also constant. Will be maintained. Further, by connecting the beam members of the respective roll units in this way, the rigidity of the entire roll stand in the slab drawing direction is also improved.

  According to the cast piece drawing apparatus of the present invention, the roll stand can be reduced in size and weight, and the roll stand can be easily manufactured, carried in / out, and repaired.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
As shown in FIG. 7, in the continuous casting equipment 100 having the slab drawing 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 pass line L extends in a curved shape starting from the lower side of the mold 103. Further, a secondary cooling zone 104 including a plurality of support rolls and cooling sprays is provided so as to surround the pass line L, and a plurality of positions between the start end portion and the end end portion of the pass line L (in the present embodiment). The slab drawing device 1 is provided at the 2 position. The molten steel T that has flowed into the tundish 102 from the ladle 101 and the dummy bar provided at the tip of the molten steel T are pulled out by the slab drawing device 1 so as to pass through the pass line L from the start end toward the end. . Further, 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, whereby a slab is formed.

The slab drawing device 1 includes a roll stand 3 having a plurality of pairs of pinch rolls 2 parallel to each other for holding and pulling a dummy bar or slab (hereinafter referred to as a slab) conveyed from a mold 103, and each pair of pinches. A roll rotating device 9 that applies a rotational driving force to one or both of the rolls 2 is provided.
As shown in FIGS. 1 to 3, the roll stand 3 includes a plurality of roll units 5 (three bodies in the present embodiment) having a pair of pinch rolls 2, and the plurality of roll units 5 arranged in a row. A common frame 4 that is supported in an open state and a connecting means 8 that connects adjacent roll units 5 are provided.

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 face closer to the pass line L to the end face farther from the pass line L. Two through-holes 43 form a set from one end of the support plate 41, and the interval between the through-holes 43 in each set is equal.
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 support plate 41 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.
In addition, each roll unit 5 includes a pair of side frames 50 that are disposed on both ends of the pair of pinch rolls 2 so as to protrude from the common frame 4, and a pair of side frames 50 that protrude from the common frame 4. A beam member 55 that connects the tip portions, and a roll pivot mechanism 61 that has a pair of pinch rolls 2 and pivots the pair of pinch rolls 2 between the pair of side frames 50 so as to be close to and away from each other. I have.

The pair of side frames 50 includes a pair or a plurality of pairs (two pairs in the present embodiment) of tie rods 51 arranged on one end side and the other end side of the pair of pinch rolls 2.
Each tie rod 51 is formed in a circular pole shape having an outer diameter equal to or slightly smaller than the cross-sectional radius of the through hole 43 formed in each support plate 41 of the common frame 4. It is also conceivable to fasten the tie rod 51 and the through-hole 43 of the common frame 4 by an interference fit. In this case, the outer diameter of the tie rod 51 is slightly larger than the cross-sectional diameter of the through-hole 41.

The tie rod 51 is made of a general strength rolled steel material such as SS400, carbon steel for mechanical structure such as S45C, alloy steel for mechanical structure such as chrome molybdenum steel, high strength material such as stainless steel such as SUS304 or SUS316, or a commercial rod. It is made of steel. Further, a material whose surface is subjected to nitriding treatment or chrome plating treatment can be used as the tie rod 51.
The beam member 55 is formed in a flat plate shape having a predetermined thickness, and each of the through holes 43 is located at a position where the pair of support plates 41 of the common frame 4 can face each pair of the through holes 43. A through-hole 56 having the same diameter as that of the first hole is formed. In addition, an opening 57 penetrating from one flat surface of the beam member 55 toward the other flat surface is also formed in the central portion of the beam member 55. Further, the beam member 55 is formed with an engaging portion 58 that engages with the connecting means 8 on the outer side of the through hole 56 that forms a set on the same side.

The engaging portion 58 is formed by gradually narrowing the width in the pass line L direction from one flat plate surface far from the pass line L to the other flat plate surface closer to the pass line L. The tapered hole 59 includes a notch 60 having an inclined wall 60a parallel to the inclined wall 59a at a position facing the inclined wall 59a of the tapered hole 59.
The roll pivot mechanism 61 includes a first roll assembly 72 provided on the common frame side having one pinch roll 22 and a housing 62 pivotally supporting the one pinch roll 22, and the other pinch roll 23. A second roll assembly 73 provided on the beam member 55 side with a housing 63 that pivotally supports the other pinch roll 23, and the second roll assembly 73 approaching the first roll assembly 72. And driving means 74 for separating.

The first roll assembly 72 includes housings 62 at both ends of one pinch roll 22, and each housing 62 includes a pivot 64 that pivotally supports the one pinch roll 22 via a bearing or the like. In addition, a fitting portion 65 that can be fitted to the tie rod 51 located on the same side is provided.
The fitting portion 65 is configured by forming a pair of fitting holes 66 on both sides of the pivotal support portion 64 that penetrates from one end face located closer to the pass line L to the other end face located farther. Has been. Each fitting hole 66 is formed in a circular cross section having a diameter slightly larger than the outer diameter of the tie rod 51.

Each fitting hole 66 is provided with a fitting 87 for fitting the housing to the tie rod at an opening edge located closer to the pass line L.
As shown in FIG. 5, each fitting tool 87 includes a female sleeve 88 provided at the opening edge and a male sleeve 89 that can be inserted into the female sleeve 88. The female sleeve 88 has a flange 88a that overlaps the opening edge and a tapered hole 88b that gradually decreases in inner diameter in a direction away from the flange 88a. The male sleeve 89 includes a flange 89a that can overlap the flange 88a of the female sleeve 88, and a cylindrical portion 89b that gradually decreases in outer diameter in a direction away from the flange 89a.

  The inclination angle of the tapered hole 88b of the female sleeve 88 and the inclination angle of the cylindrical portion 89b of the male sleeve 89 are the same. When the male sleeve 89 is inserted into the female sleeve 88, the inclined surfaces come into contact with each other, but a slight gap is generated between the flanges 89a and 88a of the male sleeve 89 and the female sleeve 88. In addition, bolt holes 88c and 89c are formed at opposite positions in the flanges 88a and 89a of both sleeves 88 and 89, respectively. By inserting and fastening the bolt 90 into the bolt holes 88c and 89c, the gap is narrowed, and the cylindrical portion 89b of the male sleeve 89 slides on the inclined surface of the tapered hole 88b of the female sleeve 88 and enters further into the back. . At this time, the cylindrical portion 89b is pressed by the tapered hole 88b, whereby the inner diameter of the cylindrical portion 89b is reduced. As a result, the housing 62 is fitted to the tie rod 51 via the fitting tool 87.

In order to facilitate the diameter reduction of the male sleeve 89 and the diameter expansion of the female sleeve 88, a linear slit 88d (see FIG. 5) that penetrates the inside and outside of the female sleeve 88 from one end to the other end in the axial direction of the female sleeve 88. It is also possible to adopt a configuration in which a two-dot chain line is provided).
As shown in FIG. 2, the second roll assembly 73 includes housings 63 at both ends of the other pinch roll 23, and each housing 62 pivotally supports the other pinch roll 23 via a bearing or the like. And a fitting portion 68 that can be fitted to the tie rod 51 located on the same side with a slight gap.

  As shown in FIG. 6, the fitting portion 68 has a pair of fitting holes 69 penetrating from one end face located closer to the pass line L to the other end face located farther from the pass line L. It is formed on both sides. Each fitting hole 69 is formed to have a circular cross section, and has an enlarged diameter portion 69a formed at a diameter larger than the outer diameter of the tie rod 51 at both opening edges, and the pair of enlarged diameter portions 69a is connected to the tie rod. It is formed by being connected by a midway portion 69b having a diameter larger than the outer diameter of 51. Further, a bush 70 having an inner diameter substantially equal to the outer diameter of the tie rod 51 is fitted in each enlarged diameter portion 69a, and a resin dust seal 71 is fitted in a recess 70a formed on the inner peripheral surface of the bush 70. Is deployed.

As shown in FIG. 2, the driving means 74 includes a housing 75 of the second roll assembly 73, a beam 75 connecting the other housing 63, and a fluid cylinder 76 having a piston rod 76 a connected to the beam 75. Supply means (not shown) for supplying a fluid to the fluid cylinder 76.
Further, the connecting means 8 is fitted to the beam members 55 of the roll units 5 adjacent to each other, and the fitting member 82 has a pair of regulating portions 81 that regulate the movement of the beam members 55 in the approaching direction or the separating direction. And a pressing member 83 that presses each beam member 55 toward each regulating portion 81 of the fitting member 82.

As shown in FIG. 4, the fitting member 82 is a flat plate in which a pair of restricting portions 81 that can be fitted into the tapered holes 59 constituting the engaging portions 58 of the beam members 55 that are adjacent to each other are connected by a connecting portion 84. It is formed in a bifurcated shape. Each restricting portion 81 is formed in a flat plate shape having an inclined portion 81 a that can be brought into close contact with the inclined wall 59 a of the tapered hole 59.
Further, the pressing member 83 is formed so as to be fitted between the notch portions 60 constituting the engaging portions 58 of the beam members 55 that are adjacent to each other, and can be brought into close contact with the inclined wall 60a of each notch portion 60. An inclined portion 83a is provided. The fitting member 82 and the pressing member 83 are opposed to each other in a state of being engaged with the engaging portion 58 of the beam member 55 to be adjacent to each other, and each of the opposing portions has a plurality of bolt holes 85. Is formed.

The roll stand 3 is constituted by these members. In order to form the roll stand 3 by these members, first, each tie rod 51 is inserted into a through hole 43 formed in the support plate 41 of the common frame 4. Conclude. As a result, twelve tie rods 51 project from the common frame 4. These twelve tie rods 51 are divided into three groups each consisting of four from one end of the common frame 4.
Hereinafter, assembly of one roll unit 5 will be described.
First, one pinch roll 22 is pivotally supported by a pair of housings 62 to form a first roll assembly 72, and each fitting hole constituting the fitting portion 65 of each housing 62 of the first roll assembly 72. The tie rod 51 is inserted into 66.

Then, each housing 62 is fitted to the tie rod 51 by the fitting tool 87 while the housing 62 of the first roll assembly 72 is grounded to each support plate 41 of the common frame 4. Thereby, each housing 62 is fitted to the tie rod 51 at the end surface (upper surface) closer to the pass line L, and the rigidity of each tie rod 51 in the slab drawing direction is improved.
Next, the other pinch roll 23 is pivotally supported by a pair of housings 63 to form a second roll assembly 73, and each fitting constituting the fitting portion 68 of each housing 63 of the second roll assembly 73. After inserting the bush 70 attached with the dust seal 71 into the hole 69, the tie rod 51 is inserted. Thereby, a pair of pinch rolls 2 face each other.

Then, the beam 75 of the driving means 74 is attached across the pair of housings 63, 63 of the second roll assembly 73.
Next, each tie rod 51 is inserted through the through hole 56 of the beam member 55 and fastened. Then, the fluid cylinder 76 of the driving means 74 is installed in the beam member 55, the piston rod 76 a of the fluid cylinder 76 is inserted into the opening 57 of the beam member 55, and the tip of the piston rod 76 a is inserted into the beam 75. Link.
Thus, one roll unit 5 is erected on the common frame 4. By assembling the above for each set of tie rods 51, each roll unit 5 is erected on the common frame 4 in a line, thereby forming a pass line L that passes through each pair of pinch rolls 2. It will be.

After each tie rod 51 is inserted into the beam member 55 and fastened, the second roll assembly 73 and the first roll assembly 72 are sequentially inserted into the tie rod 51, and the second roll assembly 73 and the beam member 55 are further inserted. Each roll unit 5 is formed first by providing the drive means 74 over the top and the tie rod 51 of each roll unit 5 is inserted into the through-hole 43 of the common frame 4 and fastened. The roll unit 5 may be erected on the top.
Next, as shown in FIG. 4, the beam members 55 of the roll units 5 adjacent to each other are connected by the connecting means 8.

In the connection by the connecting means 8, first, the restricting portion 81 of the fitting member 82 is engaged from the fluid cylinder grounding side toward the tapered hole 59 of the engaging portion 58 forming the adjacent beam member 55. At this time, the inclined portion 81 a of the restricting portion 81 of the fitting member 82 is brought into contact with the inclined wall 59 a of each tapered hole 59. Then, the pressing member 83 is fitted from the side where the beam 75 is arranged between the notches 60 constituting the engaging portions 58 of the adjacent beam members 55. At this time, each inclined portion 83 a of the pressing member 83 is brought into contact with the inclined wall 60 a of the notch portion 60.
Then, bolts are inserted into the bolt holes 85 of the fitting member 82 and the pressing member 83 and tightened. Accordingly, the inclined wall 59a of the tapered hole 59 forming the engaging portion 58 of each beam member 55 is in close contact with the inclined portion 81a of the restricting portion 81 of the fitting member 82, and the inclined wall 60a of the notch 60 is the pressing member 83. Thus, each beam member 55 is caulked and fixed to the connecting means 8. Thereby, the roll stand 3 is formed.

In the present embodiment, the roll unit 5 is erected with respect to one common frame 4 in this way, and then the beam member 55 of each roll unit 5 is connected by the connecting means 8. A slight shift between the roll units 5 due to a slight manufacturing error of every 5 is eliminated by being connected by these connecting means 8.
Therefore, if each roll unit 5 is assembled with a certain degree of manufacturing accuracy, the accuracy of the entire roll stand 3 formed by finally assembling these members can be maintained at a high level.

  The formation of a member that fits all twelve tie rods 51 without gaps on the side opposite to the common frame 4 not only requires extremely high manufacturing accuracy, but also entails an increase in the size of the member. In this embodiment, the beam members 55 are formed in units of the roll unit 5, and these beam members 55 are connected by the connecting means 8. Therefore, each beam member 55 only needs to be formed so as to be able to be inserted into the four tie rods 51. Each member can be miniaturized and is not required to have an excessively high manufacturing accuracy, and the cost of the apparatus can be reduced. Will also be planned.

Further, since the beam members 55 are connected and integrated, the rigidity in the slab drawing direction is improved, and the housing 62 of the first roll assembly 72 of each roll unit 5 is grounded to the common frame 4. Combined with this, the rigidity of the entire roll stand 3 is improved.
Further, as shown in FIG. 7, the roll rotating device 9 for applying a rotational force to each pinch roll 2 includes an electric motor, a speed reducer connected to the electric motor, and a universal connecting the speed reducer and each pinch roll 2. A spindle 90 is provided on the side of the roll stand 3.
According to the present embodiment, the roll stand 3 is formed by standing a plurality of roll units 5 on the common frame 4, and each roll unit 5 is also formed by assembling a plurality of members. Even if any member is damaged, only the member needs to be replaced, so that maintenance and repair work can be easily performed.

  In the present embodiment, the frame structure for supporting the housing 62 that pivotally supports the three pairs of pinch rolls 2 forming the pass line L is composed of 12 tie rods 51 constituting the three roll units 5 and three pieces. The beam member 55 and the connecting means 8 for connecting them are not necessary, and a conventional large frame for pivotally supporting all of the pinch rolls 2 is not required, thereby reducing the size and weight of the roll stand 3. Thus, the roll stand 3 can be easily carried in and out. In particular, since each housing 62 is supported by a pair of rod-shaped tie rods 51, the members supporting each housing 62 can be significantly slimmed (thinned / thinned), and the replacement work of the members can be facilitated. It is illustrated.

  Further, when the slab that is actually conveyed along the pass line L is sandwiched between each pair of pinch rolls 2, the pass line downstream of the tie rod 51 with the roll rotation axis of the housing 63 of the second roll assembly 73 acting as an action point. The pull-out force toward is applied. In this embodiment, since the housing 62 of the first roll assembly 72 is fitted and fixed to the tie rod 51 in a state of being grounded to the common frame 4, the support point of the tie rod 51 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 51 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 51 is significantly lower than in such a case, and the bending stress or bending deformation to the tie rod 51 due to the pulling force is reduced.

  That is, each roll unit 5 of this 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 51 with respect to the pulling force acting on the other pinch roll 23 is reduced. It is a highly rigid structure. In addition, since the housing 62 of the first roll assembly 72 is fitted and fixed to the tie rod 51 in a state of being grounded to the common frame 4, the first pulling force for pulling the slab passing over the pass line L is used for the first. The moment acting on the tie rod 51 from the roll assembly becomes the upper surface of the housing 62 of the first roll assembly 72. As a result, in this embodiment, the distance between the support point and the action point is shorter than when the first roll assembly 72 is fixed to the tie rod 51 in a state of being separated from the common frame 4. In this embodiment, the moment acting on the tie rod 51 is significantly lower than in such a case, and the bending stress or bending deformation on the tie rod 51 due to the pulling force is reduced.

Further, 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, so that the roll stand 3 as a whole with respect to the slab drawing direction is also supported. Stiffness is also improved.
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, it is also possible to deploy in a continuous casting facility 100 having a vertical pass line L.

  Further, as shown in FIG. 8, the rotation axis of the other pinch roll 23 of each roll unit 5 is located on the same virtual circumference, and extends straightly connecting the rotation axes of each pair of pinch rolls 2. However, the same effects as those of the present embodiment can be obtained when the configuration intersects with the pass line L perpendicularly and faces the center direction of the virtual circumference. In order to achieve such a configuration, in the embodiment shown in FIG. 8, the pair of support plates 41 of the common frame 4 is provided with an installation portion 45 for installing the first roll assembly 72 of each roll unit 5. Yes. Each installation part 45 is formed in the planar shape which becomes perpendicular | vertical to the straight line which connects the rotating shaft center of a pair of pinch roll 2 of the roll unit 5 each arrange | positioned. Moreover, the through-hole 43 formed in each installation part 45 has an axial center which becomes parallel to each straight line, respectively. Thereby, these three pairs of pinch rolls 2 can be arranged on concentric virtual circumferences, and the cast piece drawing apparatus 1 can be arranged on the curved portion of the curved pass line L.

If the straight line connecting the rotation centers of each pair of pinch rolls 2 is orthogonal to the pass line L, the straight line does not need to be directed in the radial direction of the same virtual circle, and an elliptical arc shape or other curvature It is also possible to provide an arcuate pass line L other than the arcuate shape such as an arcuate pass line L.
In addition, as shown in FIG. 9, it is possible to provide two driving means 74 on the beam member 55 and connect each driving means 74 to the housing 63 of the second roll assembly 73. According to this, the beam 75 of the above embodiment can be omitted. When the beam 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 beam 75. It will be a thing. When such a large bending deformation occurs in the beam 75, the housing 63 connected to the beam 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 51 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 beam 75, the beam 75 needs to have a relatively large member configuration. However, according to the configuration as shown in FIG. It is not.

Further, since the bending moment acting on the beam member 55 from the fluid cylinder 76 can be distributed to the left and right, the rigidity of the beam member 55 can be reduced (for example, formed thin).
Furthermore, since the beam 75 can be omitted and the beam member 55 can be formed thin, the overall height of the 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.
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 disposed at a position different from the above embodiment, such as the side portion of the tie rod 51 and the common frame 4. It is also possible to do. In addition, the roll diameter of the pinch roll 2 may be different for each roll unit 5.

It is a side view of the slab drawing apparatus which concerns on this invention. It is a front view of this slab drawing apparatus. It is a side view which decomposes | disassembles and shows a roll unit. It is an assembly side view which fractures | ruptures and shows a part of slab drawing apparatus. It is sectional drawing of a 1st roll assembly. It is sectional drawing of a 2nd roll assembly. It is a side view of a continuous casting facility. It is a side view of the other slab drawing apparatus which concerns on this invention. It is a front view of the other slab drawing apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casting drawing apparatus 2 A pair of pinch rolls 3 Roll stand 4 Common frame 5 Roll unit 8 Connecting means 9 Roll rotation apparatus 22 Pinch roll 23 Pinch roll 50 Side frame 55 Beam member 61 Roll pivot mechanism 62 Housing 63 Housing 72 1st Roll assembly 73 Second roll assembly 74 Driving means 81 Restricting portion 82 Fitting member 83 Pressing member

Claims (8)

A slab drawing apparatus having a roll stand having a plurality of pairs of pinch rolls for drawing a slab of a continuous casting facility,
The roll stand includes a plurality of roll units having a pair of pinch rolls, and a common frame that supports the plurality of roll units in a row.
Each roll unit is a beam that connects a pair of side frames that are arranged in a projecting manner to the common frame in a state of being positioned on both ends of the pair of pinch rolls, and a pair of side frames that project from the common frame. A member, and a roll support mechanism that has the pair of pinch rolls and pivots the pair of pinch rolls along the pair of side frames so as to be close to and away from each other.
The slab drawing apparatus characterized in that the beam members of the adjacent roll units are connected to each other via connecting means for maintaining a constant distance from each other.   The roll pivot mechanism includes a first roll assembly in which one pinch roll disposed on a common frame side with respect to the slab pass line is pivotally supported by a housing, and on the beam member side with respect to the pass line. A second roll assembly in which the other pinch roll to be deployed is pivotally supported by a housing, and driving means for moving the second roll assembly toward and away from the first roll assembly. The slab drawing apparatus according to claim 1.   The pair of side frames includes a pair or a plurality of pairs of tie rods disposed on one end side and the other end side of the pair of pinch rolls, and the second roll assembly includes one end side and the other end of the other pinch roll. Each side is formed by pivotally supporting the housing, and either one or both of the housings includes a fitting portion slidably fitted to at least one of one or a plurality of tie rods located on the same side. The slab drawing apparatus according to claim 2, wherein:   The fitting portion includes a fitting hole that passes through from one end surface of the housing to the other end surface and is loosely fitted to each tie rod, and a dust seal is provided at each opening edge of the fitting hole. The slab drawing apparatus according to claim 3, wherein the slab drawing device is provided.   5. The slab drawing apparatus according to claim 3, wherein each housing of the second roll assembly is connected to a common drive unit or a separate drive unit.   The first roll assembly is formed by pivotally supporting one end side and the other end side of the one pinch roll by a housing, and each housing is located on the same side in a state of being grounded to the common frame. The slab drawing apparatus according to any one of claims 2 to 5, wherein the slab drawing device is fixed in a state of being fitted to at least one of the plurality of tie rods.   The slab according to any one of claims 1 to 6, wherein a straight line connecting the rotation axes of the pair of rolls of each roll unit intersects the path line formed in a curved shape. Drawing device.   The connecting means includes a fitting member having a pair of restricting portions that are fitted to the beam members of the roll units adjacent to each other and restrict the movement of the beam members in the proximity direction or the separation direction, and each of the fitting members. The slab drawing apparatus according to any one of claims 1 to 7, further comprising a pressing member that presses each beam member toward the restricting portion.

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