JP4767639B2 - Follower roll for continuous casting machine - Google Patents

Description

  The present invention relates to a driven roll for a continuous casting machine used for casting a slab in a continuous casting machine.

  Conventionally, as a driven roll for a continuous casting machine, there is one described in JP-A-8-238549 (Patent Document 1). This continuous roll for a continuous casting machine has two rolls. Each of the rolls includes a large-diameter portion located substantially in the center in the axial direction and small-diameter portions located on both sides of the large-diameter portion in the axial direction. The two rolls are arranged in a straight line so that the small diameter portions of the rolls face each other at a predetermined interval in a direction substantially perpendicular to the moving direction of the slab.

  The small diameter portion of each roll located on the outer side in the axial direction of the driven roll for continuous casting machine is, for example, by a self-aligning roller bearing, and the small diameter portion of each roll located on the inner side in the axial direction of the driven roll for continuous casting machine is For example, by a cylindrical roller bearing, it is rotatably supported with respect to the housing located on the opposite side to the slab casting side in the roll. The cylindrical roller bearing has a collarless inner ring, an outer ring whose outer peripheral surface is aligned, and a centering seat, and the axial movement of the roller and the inner ring causes the axial expansion of the roll. It can be absorbed. The self-aligning roller bearing includes a flanged inner ring, an outer ring, and a roller, and has a centering property between the roller and the outer ring so as to receive a radial load and an axial load. The self-aligning roller bearing is generally used as a fixed-side bearing for positioning a roll.

  The conventional driven roll for a continuous casting machine is such that the small-diameter portion on the inner side in the axial direction of each roll is a free end that can expand and contract in the axial direction, that is, the bearing on the small-diameter portion side on the inner side in the axial direction of each roll. In addition to the large radial load described above, an axial load is applied to the bearing near the center in the axial direction of the continuous roll for a continuous casting machine, where a large radial load acts and the operating conditions are severe. Is prevented, and damage to the bearing near the center is suppressed.

However, in the conventional driven roll for a continuous casting machine, the small-diameter portion on the outer side in the axial direction of each roll is a fixed end that cannot move in the axial direction, that is, installed on the outer side in the axial direction of each roll Since the self-aligning roller bearing receives the axial load and positions the roll, the above self-aligning roller bearing on the outer side in the axial direction of the roll receives a large radial load and further, There is a problem of frequent breakage due to an axial load caused by thermal expansion and an axial load from the slab. For this reason, there exists a problem that the lifetime of the follower roll for continuous casting machines is short.
JP-A-8-238549

  Then, the subject of this invention is providing the driven roll for continuous casting machines with which the bearing arrange | positioned on a roll is hard to be damaged, and its lifetime is long.

In order to solve the above problems, the driven roll for a continuous casting machine of the present invention is:
A plurality of three or four or more rolls arranged in a substantially straight line;
A rolling element that is disposed on the outer peripheral surface of each axial end portion of each roll, and that is slidable in the axial direction with respect to at least one of the inner ring, the outer ring, and the inner ring and the outer ring. A first bearing having:
Of the two end rolls positioned at the outer end in the axial direction of the rolls, directly on the outer end in the axial direction of the first bearing on the outer side in the axial direction of one end roll. A second bearing capable of receiving an axial load by being indirectly contacted with a target or a member and movable in the axial direction;
A first biasing member that biases the second bearing inward in the axial direction;
Of the two end rolls positioned at the outer end in the axial direction of the rolls, directly on the outer end in the axial direction of the first bearing on the outer side in the axial direction of the other end roll. A third bearing that receives an axial load by indirect contact with the target or a member and is movable in the axial direction;
A second urging member that urges the third bearing inward in the axial direction,
The end of the inner end of the one end roll, the end of the inner end of the other end roll, and the one end roll and the other end roll of the plurality of rolls. The end portions on both sides of the roll to be removed are free ends that can be expanded and contracted in the axial direction, and end surfaces of adjacent rolls are in contact with each other.
In one embodiment,
The first bearing is disposed in the axle box .

  According to the driven roll for a continuous casting machine of the present invention, the first bearing disposed on the outer peripheral surface of both ends in the axial direction of each roll has the above rolling shaft with respect to one of the inner ring and the outer ring. Therefore, even if the roll extends in the axial direction due to a temperature rise, the axial load is hardly applied to the first bearing, and the load applied to the first bearing is reduced. Only a substantially radial load can be obtained, and damage to the first bearing can be suppressed.

  Moreover, according to the driven roll for continuous casting machines of this invention, the axial load resulting from the expansion | extension of the said axial direction of the said roll can be supported by the 2nd bearing and 3rd bearing which receive an axial load. Moreover, since the force can be applied to the second bearing and the third bearing in the axial direction by the biasing member, the second bearing and the third bearing can exhibit desired performance.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an enlarged schematic view showing a slab casting portion of a continuous casting machine.

  The continuous casting machine includes a ladle and a turret (not shown), a tundish 1, a mold 2, a drive roll 4 that can rotate by itself, a motor, and the like, and an embodiment of the present invention that cannot rotate by itself. And a continuous roll for a continuous casting machine (hereinafter referred to as a driven roll) 5. The driving roll 4 is disposed in place of the predetermined number of driven rolls 5.

  The ladle is supported by a turret. Molten steel is poured from the ladle through the nozzle 8 to the tundish 1 and then molded into a predetermined shape (strip-shaped) slab in the mold 2 and the surface is cooled. After that, the slab is cast, guided and conveyed by the drive roll 4 and the driven roll 5 which are separated so that the axis of the slab is parallel to the surface of the slab, and gradually cooled. .

  FIG. 2 is a partial plan view showing the arrangement structure of the driven roll 5.

  In FIG. 2, the driven rolls 5 are arranged in seven rows with respect to the direction in which the slab is cast. The follower roll 5 includes three rolls 21, 22, 23, four first axle boxes 25, 25, 25, 25, a second axle box 26, and a third axle box 27. The three rolls 21, 22, 23 are arranged on a substantially straight line. Precisely, the central axes of the three rolls 21, 22, 23 are arranged on substantially the same straight line. The three rolls 21, 22, and 23 are all different in length. The intermediate length M roll 22 is disposed between the shortest S roll 21 and the longest L roll 23. Each of the three rolls 21, 22, and 23 includes a large-diameter portion located substantially at the center in the axial direction, a small-diameter end portion located on one side of the large-diameter portion in the axial direction, and an axial direction of the large-diameter portion. And a small-diameter end located on the other side.

  The first axle box 25 is disposed so as to cover the two adjacent small diameter ends of the two rolls 21 and 22 adjacent in the axial direction or the two rolls 22 and 23 adjacent in the axial direction. ing. That is, the two on the one side of the four first axle boxes 25 are arranged so as to cover the small diameter end of the S roll 21 and the small diameter end of the M roll 22 adjacent to the S roll 21, respectively. The other two sides of the first axle box 25 are arranged so as to cover the small diameter end portion of the M roll 22 and the small diameter end portion of the L roll 23 adjacent to the M roll 22, respectively.

  The second axle box 26 is arranged so as to cover the axially outer small-diameter end of the roll 21 or 23 located at one of the axial outer ends, and the third axle box 27 is It arrange | positions so that the small-diameter end part of the outer side of the axial direction of the roll 23 or 21 located in the other of the outer ends of an axial direction may be covered.

  FIG. 3 is a diagram showing in detail the inside of the first axle box 25 covering the small diameter end portion of the M roll 22 and the small diameter end portion of the L roll 23. Although not described, the internal structure of the first axle box 25 covering the small diameter end portion of the S roll 21 and the small diameter end portion of the M roll 22 has the same structure as the structure shown in FIG.

  As shown in FIG. 3, the axial end surface of the small diameter end portion 31 of the M roll 22 is in contact with the axial end surface of the small diameter end portion 32 of the L roll 23. A cylindrical roller bearing as an example of a first bearing is provided between the small diameter end portion 31 of the M roll 22 and the first axle box 25 and between the small diameter end portion 32 of the L roll 23 and the first axle box 25. 35, 35 are arranged. Each cylindrical roller bearing 35 is disposed between the inner ring 40, the outer ring 42, the cylindrical roller 43 disposed between the inner ring 40 and the outer ring 42, and the outer ring 42 and the inner peripheral surface of the first axle box 25. And a centering seat 47.

  The inner ring 40 is fitted and fixed to the small diameter end portion 31 (or the small diameter end portion 32). The outer surface on the radially outer side of the inner ring 40 is composed of one cylindrical surface having the same outer diameter, and the inner ring 40 has a structure having no flange. The outer peripheral surface of the outer ring 42 is a centering surface. On the inner peripheral surface of the outer ring 42, a hook is formed that makes it impossible for the cylindrical roller 43 to move in the axial direction relative to the outer ring 42. The alignment seat 47 is disposed between the outer peripheral surface of the outer ring 42 and the inner peripheral surface of the first axle box 25. The cylindrical roller bearing 35 has a structure in which the cylindrical rollers 43 slide in the axial direction with respect to the inner ring 40 when the rolls 21, 22, and 23 are thermally expanded and extend in the axial direction. 35, almost no axial load acts. That is, the cylindrical roller bearing 35 can absorb the expansion and contraction of the rolls 21, 22, and 23 in the axial direction. The small diameter end portions 31 and 31 on both sides in the axial direction of the M roll 22, the small diameter end portion 32 on the M roll 22 side of the L roll 23, and the small diameter end portion on the M roll 22 side of the S roll 21 are in the axial direction. It has a free end that can be stretched. Moreover, while making the end surface of one roll of adjacent rolls into a convex surface, the end surface of the other roll among adjacent rolls is made into the concave surface corresponding to the said convex surface. Specifically, the end surface on the L roll 23 side of the M roll 22 is a convex surface, and the end surface on the M roll 22 side of the L roll 23 is a concave surface having a shape corresponding to the convex surface (M roll). The end surface on the L roll 23 side of 22 may be a concave surface, and the end surface on the M roll 22 side of the L roll 23 may be a convex surface). If it does in this way, damage to the end face of a roll resulting from contact between rolls can be reduced.

  FIG. 4 is a view showing the inside of the second axle box covering the outer small-diameter end portion 51 in the axial direction of the L roll 23 shown by 26 in FIG.

  As shown in FIG. 4, a cylindrical roller bearing 54 as an example of a first bearing is disposed between the small-diameter end 51 in the axial direction of the L roll 23 and the second axle box 26. The cylindrical roller bearing 54 is disposed between the inner ring 50, the outer ring 52, the cylindrical roller 53 disposed between the inner ring 50 and the outer ring 52, and the outer ring 52 and the inner peripheral surface of the second axle box 26. And a centering seat 58. The outer surface on the radially outer side of the inner ring 50 is composed of one cylindrical surface having the same outer diameter, and the inner ring 50 has a structure having no flange. The outer peripheral surface of the outer ring 52 is a centering surface. On the inner peripheral surface of the outer ring 52, a hook is formed that makes it impossible for the cylindrical roller 53 to move in the axial direction with respect to the outer ring 52. Further, the aligning seat 58 is disposed between the outer peripheral surface of the outer ring 52 and the inner peripheral surface of the second axle box 26. The cylindrical roller bearing 54 has a structure in which the cylindrical roller 53 slides in the axial direction with respect to the inner ring 50 when the rolls 21, 22, and 23 expand and contract in the axial direction due to temperature fluctuation. In addition, almost no axial load is applied. That is, the cylindrical roller bearing 54 can absorb the expansion and contraction of the rolls 21, 22, and 23 in the axial direction. The outer ends in the axial direction of the two rolls 21 and 23 at the outer ends in the axial direction are free ends that can expand and contract in the axial direction. That is, the end of the small-diameter end 51 in the axial direction of the L roll 23 and the end of the small-diameter end of the S roll 21 in the axial direction are free ends that can expand and contract in the axial direction. .

  A thrust self-aligning roller bearing 66 as an example of a second bearing is disposed on the outer side in the axial direction of the radially outer end face 55 of the small-diameter end portion 51. This thrust self-aligning roller bearing 66 has an inner ring 60, an outer ring 61, and a barrel-shaped roller 62. The thrust self-aligning roller bearing 66 is indirectly in contact with the end surface 55 of the small-diameter end portion 51 via the member 56 and the member 57, and receives an axial load.

  Further, a coil spring 59 as an example of an urging member is disposed on the outer side in the axial direction from the outer end surface of the outer ring 61 in the axial direction. Three coil springs 59 are arranged at predetermined intervals in the circumferential direction outward in the axial direction from the thrust self-aligning roller bearing 66. The coil spring 59 biases the thrust spherical roller bearing 66 inward in the axial direction, and applies a preload to the thrust spherical roller bearing 66. In this manner, excessive slip occurs between the raceway surface 62 of the inner ring 60 and between the raceway surface 62 of the outer ring 61, and the thrust spherical roller bearing 66 can exhibit predetermined performance. Prevents disappearance.

  Although not described in detail, the internal structure of the third axle box covering the outer small-diameter end of the S roll 21 indicated by 27 in FIG. 2 is the same as the components of the second axle box 26 (in some cases However, the thrust self-aligning roller bearing as an example of the third bearing supporting the axial load may not be movable in the axial direction. In this case, The internal structure of the third axle box 27 is different from the internal structure of the second axle box 26. Other structures are the same as the components of the second axle box 26 (although the dimensions may be changed in some cases). Specifically, the third axle box 27 is immovable in the axial direction with respect to the housing located on the opposite side of the roll from the slab casting side, and is disposed in the third axle box 27. A thrust spherical roller bearing as an example of a bearing is immovable in the axial direction with respect to the third axle box 27. The structure other than the structure in which the thrust spherical roller bearing in the internal structure of the third shaft box 27 is not movable in the axial direction is the same as the internal structure of the second shaft box 26.

  According to the driven roll 5 of the above embodiment, the cylindrical roller bearings 35 and 54 arranged one by one on the outer peripheral surfaces of the axial ends of the rolls 21, 22, and 23 have the rollers 43 and 53 as the inner rings 40 and 50. Therefore, even if the rolls 21, 22, and 23 expand and contract in the axial direction due to temperature fluctuation, the rollers 43 and 53 slide in the axial direction with respect to the inner rings 40 and 50. The expansion and contraction can be absorbed and the axial load is hardly applied to the cylindrical roller bearings 35 and 54. Accordingly, since the load applied to the cylindrical roller bearings 35 and 54 can be limited to only a substantially radial load, damage to the cylindrical roller bearings 35 and 54 can be suppressed.

  Further, according to the driven roll 5 of the above-described embodiment, the axial self-aligning roller bearing 66 that receives an axial load and the axial self-aligning roller bearing in the third shaft box 27 are arranged in the axial direction of the rolls 21, 22, and 23. Axial loads resulting from elongation can be supported. Further, since the coil spring 59 can apply axial force to the thrust spherical roller bearing 66 and the thrust spherical roller bearing in the third shaft box 27 in the axial direction, the thrust spherical roller bearing 66 and the third shaft box are provided. The thrust self-aligning roller bearing in 27 can exhibit desired performance. That is, excessive sliding between at least one of the outer ring 61 and the inner ring 60 of the thrust self-aligning roller bearing 66 and the roller 62 can be prevented, and the outer ring of the thrust self-aligning roller bearing in the third shaft box 27 can be prevented. In addition, excessive sliding between at least one of the inner ring and the roller can be prevented.

  Further, according to the driven roll 5 of the above-described embodiment, the urging member is composed of an urging member (coil spring 59 in this embodiment) that can be expanded and contracted in the axial direction, so that the rolls 21, 22, and 23 are extended. Can be absorbed by the coil spring 59, and an excessive axial load is not applied to the thrust spherical roller bearing 66 and the thrust spherical roller bearing in the third shaft box 27. Therefore, the thrust spherical roller bearing 66 and The thrust self-aligning roller bearing in the third shaft box 27 can be prevented from being damaged. Further, since the extension of the rolls 21, 22, and 23 can be absorbed by the coil spring 59, the negative gap between the two rolls 21 and 22 adjacent in the axial direction or the two rolls 22 and 23 adjacent in the axial direction. (Compression amount) does not become excessive, and damage to the axial ends of the rolls 21, 22, 23 can be prevented.

  In the driven roll 5 of the above-described embodiment, the coil spring 59 is employed as the urging member. However, in the present invention, an urging member other than the coil spring 59 such as a leaf spring (an apparatus having an ability to urge the force) is employed. You may do it.

Moreover, in the driven roll 5 of the said embodiment, although the number of rolls was 3, the number of rolls may be four or more.

  Moreover, in the driven roll 5 of the said embodiment, although the coil spring 59 was arrange | positioned 3 each at the edge part of the both sides of an axial direction, and conveniently 6 each, the urging | biasing member is only the edge part of the one side of an axial direction. May be arranged. Moreover, in the driven roll 5 of the said embodiment, although the three coil springs 59 were arrange | positioned in the circumferential direction at predetermined intervals at the edge part, it is preferable to arrange | position the same spring at regular intervals in the circumferential direction. Further, instead of the three coil springs, one spring may be arranged concentrically with the second bearing and the third bearing.

  Further, in the driven roll 5 of the above-described embodiment, the cylindrical rollers 35 and 54 are configured to be slidable in the axial direction with respect to the inner rings 40 and 50. However, in the present invention, on the outer peripheral surface of the end portion of the roll. The rolling element of the 1st bearing arrange | positioned should just be able to slide to an axial direction with respect to at least one of an inner ring | wheel and an outer ring | wheel.

  Moreover, in the driven roll 5 of the said embodiment, although the 1st bearing arrange | positioned at the outer peripheral surface of the edge part of the rolls 21, 22, and 23 was the cylindrical roller bearings 35 and 54, in this invention, the end of a roll The 1st bearing arrange | positioned at the outer peripheral surface of a part may be a rolling bearing which can load radial loads other than a cylindrical roller bearing, such as a ball bearing.

  Further, in the driven roll 5 of the above-described embodiment, the second bearing disposed outside in the axial direction of the rolls 21 and 23 positioned at the outer end in the axial direction was the thrust self-aligning roller bearing 66. In the present invention, the second bearing disposed on the outer side in the axial direction of the roll located at the outer end in the axial direction is a rolling bearing for an axial load load other than a thrust spherical roller bearing such as a thrust ball bearing. May be.

  In the driven roll 5 of the above embodiment, the thrust self-aligning roller bearing 66 that is the second bearing and the thrust self-aligning roller bearing that is the third bearing in the third shaft box 27 are the outer ends in the axial direction. However, in the present invention, the second bearing and the third bearing are in the roll at the outer end in the axial direction. It may be in direct contact with the outer end face in the axial direction.

  In the driven roll 5 of the above-described embodiment, the second bearing is disposed outward in the axial direction of the L roll 23 having the longest length, and the axial direction outward of the S roll 21 having the shortest length. Although the third bearing is arranged, in the present invention, the length of the roll located at the outer end in the axial direction is any length compared to the length of the roll other than the outer end in the axial direction. The second bearing may be disposed outside the roll in the first outer end in the axial direction, and the third bearing may be disposed outward in the axial direction of the other outer end in the axial direction. It only has to be arranged.

It is an expansion schematic diagram which shows the slab casting part of a continuous casting machine. It is a fragmentary top view which shows the arrangement structure of a driven roll. It is a figure which shows in detail the inside of the 1st axle box which has covered the small diameter edge part of M roll, and the small diameter edge part of L roll. It is a figure which shows the inside of the 2nd axle box which has covered the small diameter edge part of the outer side of the axial direction of L roll.

5 Followed Roll 21 S Roll 22 M Roll 23 L Roll 25 1st Shaft Box 26 2nd Shaft Box 27 3rd Shaft Box 31,32,51 Small Diameter End 35,54 Cylindrical Roller Bearing 59 Coil Spring 66 Thrust Spherical Roller Bearing

Claims (2)

A plurality of three or four or more rolls arranged in a substantially straight line;
A rolling element that is disposed on the outer peripheral surface of each axial end portion of each roll, and that is slidable in the axial direction with respect to at least one of the inner ring, the outer ring, and the inner ring and the outer ring. A first bearing having:
Of the two end rolls positioned at the outer end in the axial direction of the rolls, directly on the outer end in the axial direction of the first bearing on the outer side in the axial direction of one end roll. A second bearing capable of receiving an axial load by being indirectly contacted with a target or a member and movable in the axial direction;
A first biasing member that biases the second bearing inward in the axial direction;
Of the two end rolls positioned at the outer end in the axial direction of the rolls, directly on the outer end in the axial direction of the first bearing on the outer side in the axial direction of the other end roll. A third bearing that receives an axial load by indirect contact with the target or a member and is movable in the axial direction;
A second urging member that urges the third bearing inward in the axial direction,
The end of the inner end of the one end roll, the end of the inner end of the other end roll, and the one end roll and the other end roll of the plurality of rolls. The driven roll for a continuous casting machine is characterized in that the end portions on both sides of the roll to be removed are free ends that can expand and contract in the axial direction, and the end faces of adjacent rolls are in contact with each other. In the driven roll for continuous casting machines according to claim 1 ,
The said 1st bearing is arrange | positioned at the axle box, The driven roll for continuous casting machines characterized by the above-mentioned.

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