JP4964632B6 - Multi-stage rolling mill - Google Patents

Description

  The present invention relates to a multistage rolling mill for switching the number of stages.

In order to improve the shape control and rolling reduction of the rolled material, various multi-stage rolling mills (X-type mills) that support the upper and lower work rolls with two backup rolls have been proposed.
In multi-stage rolling mills, the smaller the work roll diameter and the greater the number of stages, the higher the rolling reduction and the higher rolling load on the hard material. However, the rolling stability, rolling speed, and finish (shape and surface roughness) by rolling are improved. descend. Conversely, as the diameter of the work roll is larger and the number of steps is smaller, better rolling stability, rolling speed, and finish of the rolled material can be achieved, but high pressure is difficult and rolling load is reduced.
For this reason, there has been a demand for a multi-stage rolling mill that can achieve both a high pressure reduction ratio, a high rolling load, rolling stability, high speed rolling, and high quality finish using the same rolling mill.

In response to such a demand, the work roll can be easily changed in a short time in the same rolling mill, and at the same time, the number of stages suitable for the diameter of the work roll can be changed to reduce the high pressure reduction rate and the high rolling load. In addition, a multi-stage rolling mill for switching the number of stages that can achieve both rolling stability, high-speed rolling, and high-quality finishing has been proposed (see Patent Document 1).
JP-A-10-175002

However, in the technique disclosed in Patent Document 1, when the diameter of the work roll is small and the number of steps is large, the axle box that supports the work roll and the axle box that supports the intermediate roll are provided in a limited space (frame). Since it is necessary to arrange each, the axle box (bearing) which supports a work roll will become small. For this reason, since a rolling load (thrust load) and a bending load cannot be enlarged, there exists a problem that the plate shape control capability at the time of rolling will fall.
Further, there is a problem that the structure becomes complicated in order to prevent the shaft boxes from interfering with each other when the work roll and the intermediate roll are exchanged. Furthermore, even when only the work roll is replaced, there is a problem that the intermediate roll or the like must be removed.

The present invention has been made in view of the above-described circumstances, and an object thereof is to propose a multi-stage rolling mill that can apply a large thrust load or bending load to a work roll even when the number of stages is large. To do.
It is another object of the present invention to propose a multi-stage rolling mill with a simple structure, easy switching of the number of stages, and capable of exchanging only the work rolls.

In the multistage rolling mill for switching the number of stages according to the present invention, the following means are adopted in order to solve the above problems.
A multi-stage rolling mill having a work roll pair and an intermediate roll pair, which are removably attached between backup roll pairs, and are arranged at both ends of the work roll pair so as to come into contact with respective end faces of the work roll pair. A pair of roll-type bearings are provided.

  Further, the pair of roll type bearings are supported by a backup roll shaft box that supports the backup roll pair.

  Further, one of the pair of roll type bearings is supported on the backup roll axle box so as to be separable from one end surface of the work roll pair.

  One of the pair of roll-type bearings is supported by an opening / closing lever mechanism that is supported by the backup roll axle box and straddles one end surface of the work roll pair. The roll pair is separated in a direction different from the axial direction of the roll pair.

  A work roll exchanging carriage comprising: a gripping part that grips one end of the work roll pair; and a traveling part that supports the gripping part and is movable in the axial direction of the work roll pair. Features.

  In addition, an increase bending cylinder for bending the intermediate roll pair is disposed in an intermediate roll shaft box that supports the intermediate roll pair.

  Further, a reduction bending cylinder for bending the intermediate roll pair is disposed on the backup roll shaft box.

  In addition, a spray unit that sprays liquid onto the pair of work rolls and that can adjust an ejection direction of the liquid is provided.

According to the present invention, the following effects can be obtained.
In the multistage rolling mill for switching the number of stages, since a pair of roll bearings are disposed at both ends of the work roll pair, it is possible to receive a larger thrust load than when the work roll is supported by the axle box. At the same time, a large bending load can be received.
In addition, the structure can be simplified by supporting the pair of roll-type bearings by the backup roll shaft box that supports the backup roll pair.

Further, the work roll pair can be exchanged by making one of the pair of roll type bearings separable from one end surface of the work roll pair.
Further, one of the pair of roll type bearings is disposed in an open / close lever mechanism supported by the backup roll axle box so as to straddle one end surface of the work roll pair, and the work roll is in an open state of the open / close lever mechanism. Since they are separated in a direction different from the axial direction of the pair, the work roll pair can be exchanged more easily.

  Further, by providing the work roll exchanging carriage, it is possible to improve the efficiency of exchanging work roll pairs.

  In addition, an increase bending cylinder for bending the intermediate roll pair is arranged on the intermediate roll shaft box supporting the intermediate roll pair, and a decrease bending cylinder for bending the intermediate roll pair is arranged on the backup roll axle box. The thickness of the rolled material can be controlled by indirectly bending the work roll pair.

  In addition, since it has a spray unit that can adjust the liquid ejection direction, even if the diameter of the work roll pair changes by switching the number of stages, it is possible to reliably attach the liquid to the work roll pair. It becomes.

Hereinafter, an embodiment of a multistage rolling mill for switching the number of stages according to the present invention will be described with reference to the drawings.
FIG. 1 is a side view schematically showing a ten-stage configuration of a multistage rolling mill 1 for switching the number of stages according to the present invention. FIG. 2 is a side view schematically showing a six-stage configuration of the multistage rolling mill 1 for switching the number of stages according to the present invention.
FIG. 3 is a perspective cross-sectional view showing the 10-stage configuration of the multi-stage rolling mill 1 for switching the number of stages.

  In the multi-stage rolling mill 1 for switching the number of stages, the work rolls 52 and 53 have a small diameter and a large number of stages (10 stages) (see FIG. 1), and the work rolls 82 and 83 have a large diameter and a small number of stages (six stages) ( Is a multi-high rolling mill that can be switched as needed.

  In the case of a 10-stage configuration, the multistage rolling mill 1 for switching the number of stages has a pair of upper and lower backup roll sets 10 and 20, a pair of upper and lower intermediate roll sets 30 and 40, a work roll set 50, etc., as shown in FIG. These are supported in the frame 5 so as to be movable in the vertical direction.

Each of the pair of upper and lower backup roll sets 10 and 20 includes backup rolls 12, 13, 22, and 23 that are arranged horizontally and in parallel, and end portions of the backup rolls 12, 13, 22, and 23 that are arranged at both ends thereof. There are axle boxes 14 and 24 that rotatably support the motor. The pair of upper and lower backup roll sets 10 and 20 are disposed at positions facing the rolled sheet S.
The axle boxes 14 and 24 are in contact with the opposing inner walls of the frame 5 and supported so as to be vertically movable with respect to the frame 5.
The axle boxes 14, 24 are provided with bending cylinders 16, 26 for bending the intermediate rolls 32, 33, 42, 43 (the bending cylinder 26 is not shown). As a result, a bending moment is applied to the work rolls 52 and 53 via the intermediate rolls 32, 33, 42 and 43, the work rolls 52 and 53 are roll-bended, and the shape of the rolled sheet S can be controlled. Yes.

Each of the pair of upper and lower intermediate rolls 30, 40 includes intermediate rolls 32, 33, 42, 43 arranged horizontally and in parallel, and ends of the intermediate rolls 32, 33, 42, 43 arranged at both ends thereof There are axle boxes 34 and 44 for rotatably supporting each other. The pair of upper and lower intermediate rolls 30 and 40 are disposed closer to the rolled sheet S than the backup roll sets 10 and 20 at positions facing the rolled sheet S.
The intermediate rolls 32 and 33 are arranged substantially parallel to the backup rolls 12 and 13 and in contact with one of the backup rolls 12 and 13. Similarly, the intermediate rolls 42 and 43 are disposed substantially parallel to the backup rolls 22 and 23 and in contact with one of the backup rolls 22 and 23.
Further, the intermediate rolls 32, 33, 42, and 43 are formed shorter than the backup rolls 12, 13, 22, and 23. More precisely, the intermediate rolls 32, 33, 42, and 43 are formed shorter than the backup rolls 12, 13, 22, and 23 in terms of the length of both ends accommodated in the frame 5.
The axle box 34 is installed on the lower surface of the axle box 14, and the axle box 44 is installed on the upper surface of the axle box 24.
In addition, in the axle boxes 34 and 44, there are arranged bending cylinders 36 and 46 for incrementing for bending the intermediate rolls 32, 33, 42, and 43 (the bending cylinder 36 is not shown). As a result, a bending moment is applied to the intermediate rolls 32, 33, 42, 43, the work rolls 52, 53 are roll-bended, and the shape of the rolled sheet S can be controlled.

The work roll set 50 includes a pair of work rolls 52 and 53 disposed to face the rolled sheet S, and a pair of saddle roll bearings 54 and 57 disposed on the shaft ends (end surfaces) thereof. .
The work roll 52 is disposed so as to be substantially parallel to the intermediate rolls 32 and 33 and in contact with both of the intermediate rolls 32 and 33. Similarly, the work roll 53 is disposed so as to be substantially parallel to the intermediate rolls 42 and 43 and in contact with both the intermediate rolls 42 and 43.
Further, the pair of work rolls 52 and 53 are formed longer than the intermediate rolls 32, 33, 42, and 43. More precisely, the lengths of both end portions accommodated in the frame 5 are formed to be substantially intermediate lengths between the backup rolls 12, 13, 22, 23 and the intermediate rolls 32, 33, 42, 43. As a result, both ends of the pair of work rolls 52 and 53 are positioned so as to protrude outward from the axle boxes 34 and 44 that support the intermediate rolls 32, 33, 42, and 43 and be within the frame 5. (See FIG. 4 etc.).

FIG. 4 is a front view showing the ten-stage configuration of the multistage rolling mill 1 for switching the number of stages.
FIG. 5 is a diagram for explaining the operation of the work rolls 52 and 53 and the saddle roll bearings 54 and 57.

Each of the pair of scissors roll bearings 54 and 57 has scissors rolls 55 and 58 and support portions 56 and 59 that rotatably support the scissors rolls 55 and 58.
As shown in FIG. 4, the scissors rolls 55 and 58 are disposed so as to simultaneously contact the respective end faces 52 s and 53 s of the pair of work rolls 52 and 53. More specifically, each of the scissors rolls 55 and 58 is in contact with the work roll 52 disposed on the upper side of the end surface 52s of the end surface 52s below the rotation axis, and is disposed on the lower side. 53 is in contact with the region of the end surface 53s above the rotational axis.

As shown in FIG. 5, when the rolled sheet S is supplied between the pair of work rolls 52 and 53, the work rolls 52 and 53 rotate (longitudinal rotation) as the rolled sheet S advances. Since each of the scissors rolls 55 and 58 is in contact with the lower side of the end face 52s of the work roll 52 and the upper side of the end face 53s of the work roll 53, the rolls 55 and 58 are rotated (horizontally) following the rotation of the work rolls 52 and 53. Rotate).
In this way, by disposing the saddle roll bearings 54 and 57 at both ends of the pair of work rolls 52 and 53, respectively, while supporting the work rolls 52 and 53 in rotation, the movement in the axial direction is constrained. , 53 can be supported.

Further, as described above, the pair of work rolls 52 and 53 are formed longer than the intermediate rolls 32, 33, 42, and 43, and both ends of the pair of work rolls 52 and 53 support the intermediate rolls 32, 33, 42, and 43. 34 and 44 protrude outward. For this reason, the pair of scissors roll bearings 54 and 57 are disposed in a space outside the axle boxes 34 and 44.
For this reason, the saddle roll bearings 54 and 57 can set the diameter of each saddle roll 55 and 58 to an arbitrary size without interfering with the axle boxes 34 and 44, and can easily and reliably apply a large thrust load. It is possible to support.

FIG. 6 is a top view showing the configuration of the saddle roll bearings 54 and 57. FIG. 7 is a front view showing the configuration of the saddle roll bearings 54 and 57.
The support portions 56 and 59 of the pair of saddle roll bearings 54 and 57 are connected to the upper surface of the axle box 24 that supports the backup rolls 22 and 23. The support portions 56 and 59 are both-side supported with respect to the axle box 24 so as to straddle the end faces 52s and 53s of the pair of work rolls 52 and 53. And the scissors rolls 55 and 58 are rotatably supported at the intermediate positions of the support portions 56 and 59, respectively.
Further, as described above, since both ends of the pair of work rolls 52 and 53 are located at substantially intermediate positions between both ends of the backup rolls 12, 13, 22 and 23 and the intermediate rolls 32, 33, 42 and 43, the heel roll The bearings 54 and 57 are accommodated in the frame 5 so as not to protrude into the space outside the frame 5.

Of the pair of scissors roll bearings 54 and 57, the scissors roll bearing 54 is firmly bolted to the axle box 24 at both ends of the support portion 56 so that it cannot be removed.
In the heel roll bearing 57, one end of the support portion 59 is rotatably supported with respect to the axle box 24, and the other end is supported with respect to the axle box 24 via the lock mechanism 28. . With such a configuration, the support portion 59 of the saddle roll bearing 57 functions as an open / close lever mechanism. That is, when the lock mechanism 28 is operated, both ends of the support portion 59 are firmly supported with respect to the axle box 24, whereby the scissors roll 58 is placed on the end faces 52 s and 53 s of the pair of work rolls 52 and 53. It can be made to contact. On the other hand, when the lock mechanism 28 is released, the support portion 59 is rotated around one end thereof, and the reed roll 58 (reed roll bearing 57) is moved to the end surfaces 52s and 53s of the pair of work rolls 52 and 53. It can be separated from.

As shown in FIG. 6, the support portion 59 of the saddle roll bearing 57 is rotated by approximately 90 ° with respect to the axle box 24, whereby the saddle roll 58 (the saddle roll bearing 57) from the axial direction of the pair of work rolls 52 and 53. Can be evacuated.
Accordingly, the pair of work rolls 52 and 53 can be taken out of the frame 5 by gripping the ends of the pair of work rolls 52 and 53 and pulling in the axial direction (the direction in which the saddle roll bearing 57 is present). It is possible. Conversely, the pair of work rolls 52 and 53 can be inserted from outside the frame 5.

  Returning to FIG. 2, the multi-stage rolling mill 1 for switching the number of stages includes a pair of upper and lower backup roll sets 60 and 70 and a work roll set 80 in the case of a six-stage configuration. Supported as possible.

The pair of upper and lower backup roll sets 60 and 70 are arranged at both ends of the backup rolls 62, 63, 72, and 73, and can rotate the backup rolls 62, 63, 72, and 73 freely like the backup roll sets 10 and 20. There are axle boxes 64 and 74 to be supported.
The pair of upper and lower backup rolls 60 and 70 are arranged at positions facing the rolled sheet S. The shaft boxes 64 and 74 are in contact with the opposing inner walls of the frame 5 and supported so as to be vertically movable with respect to the frame 5.

The work roll set 80 includes a pair of work rolls 82 and 83 disposed so as to face the rolled sheet S, and axle boxes 84 and 85 disposed at both ends thereof to rotatably support the work rolls 82 and 83. Have.
The work roll 82 is disposed substantially parallel to the backup rolls 62 and 63 and in contact with both of the backup rolls 62 and 63. Similarly, the work roll 83 is arranged so as to be substantially parallel to the backup rolls 72 and 73 and in contact with both of the backup rolls 72 and 73.
The axle box 84 is installed on the lower surface of the axle box 64, and the axle box 85 is installed on the upper surface of the axle box 64.

  Thus, since there is no intermediate roll in the case of the six-stage configuration, the diameter of the work rolls 82 and 83 is larger than the diameter of the work rolls 52 and 53. Further, since there is no axle box for supporting the intermediate roll, axle boxes 84 and 85 for supporting the work rolls 82 and 83 are arranged.

FIG. 8 is a view showing a work roll exchanging cart 100 used when switching the number of stages of the multi-stage rolling mill 1 for switching the number of stages.
The stage number switching multi-high rolling mill 1 includes a work roll exchanging carriage 100 for taking out and inserting a pair of work rolls 52 and 53 out of the frame 5 when switching the stage configuration.

  The work roll exchanging carriage 100 is formed on a pair of columnar members 102 and 103 arranged in parallel, substantially the same length and at the same interval as the pair of work rolls 52 and 53, and end surfaces 102s and 103s of the columnar members 102 and 103. The work roll gripping portions 112 and 113, the plurality of support columns 105 that support the position in the height direction of the columnar members 102 and 103, and the lower ends of the plurality of support columns 105 while supporting the lower ends of the columnar members 102 and 103. The traveling unit 120 is movable along the axial direction.

  The work roll gripping portions 112 and 113 are temporarily fixed to the receiving holes 112a and 113a for receiving one end of the work rolls 52 and 53 (the side of the saddle roll bearing 57) and the ends of the received work rolls 52 and 53. And set screw portions 114 and 115.

When taking out a pair of work rolls 52 and 53 out of the flame | frame 5, first, the saddle roll bearing 57 which exists in the edge part of a pair of work rolls 52 and 53 is retracted, as shown in FIG.
Next, the work roll exchanging carriage 100 is moved closer to the frame 5 of the multi-stage rolling mill 1 for switching the number of stages, so that the end faces 102s, 103s of the columnar members 102, 103 are opposed to the end faces 52s, 53s of the work rolls 52, 53. The heights of 102 and 103 are adjusted.

Then, the work roll exchanging carriage 100 is further moved closer to the frame 5, the ends of the work rolls 52 and 53 are accommodated in the accommodating holes 112 a and 113 a of the work roll gripping portions 112 and 113, and temporarily fixed by the set screw portions 114 and 115. To do.
Finally, the work rolls 52 and 53 are taken out of the frame 5 by gradually separating the work roll exchange carriage 100 from the frame 5. At this time, since the columnar members 102 and 103 have substantially the same length as the work rolls 52 and 53, the work roll exchanging cart 100 is detached from the frame 5 while holding the work rolls 52 and 53 without losing the balance. It can be separated.

In addition, when inserting a pair of work rolls 52 and 53 in the flame | frame 5, what is necessary is just to pass through the process reverse to the process of taking out the work rolls 52 and 53.
Further, when the work rolls 52 and 53 have a weight that can be transported by human power, the work roll exchanging cart 100 is not necessarily used.

As described above, according to the multi-stage rolling mill 1 for switching the number of stages according to the present embodiment, since the pair of saddle roll bearings 54 and 57 are arranged at both ends of the pair of work rolls 52 and 53, the work roll is made of a shaft box. Compared to the case of supporting, it is possible to receive a large thrust load. At the same time, a large bending load can be received.
Moreover, the simplification of the structure can be achieved by supporting the eaves roll bearings 54 and 57 by the axle box 24 that supports the backup rolls 22 and 23.

Further, by making one of the saddle roll bearings 54 and 57 (the saddle roll bearing 57) separable from one end face of the work rolls 52 and 53, the work rolls 52 and 53 can be exchanged.
Further, the saddle roll bearing 57 is disposed on the support portion 59 supported by the axle box 24 so as to straddle one end face of the work rolls 52 and 53, and when the support portion 59 is in an open state, Since they are separated in a direction different from the axial direction, the work rolls 52 and 53 can be exchanged more easily.

  Further, by providing the work roll exchanging carriage 100, it is possible to improve the efficiency of exchanging work rolls 52 and 53.

  Also, the bending cylinders 36 and 46 for bending the intermediate rolls 32, 33, 42, and 43 are disposed on the axle boxes 34 and 44 that support the intermediate rolls 32, 33, 42, and 43, and the axle box 14 24, the bending cylinders 16 and 26 for bending the intermediate rolls 32, 33, 42, and 43 are arranged, so that the work rolls 52 and 53 are indirectly bent to control the thickness of the rolled sheet S. It is possible to do.

FIG. 9 is a diagram showing a spray unit 150 that sprays the rolling lubricating oil L onto the work rolls 52, 53, 82, and 83.
In the multistage rolling mill 1 for switching the number of stages, rolling lubricant oil L (including work roll cooling oil) is supplied to the work rolls 52, 53, 82, and 83.
The rolling lubricating oil L is supplied from the spray unit 150 disposed on the front side or the rear side of the work rolls 52, 53, 82, 83. However, the diameters of the work rolls 52 and 53 and the work rolls 82 and 83 differ between the 10-stage configuration and the 6-stage configuration, and the space around the work rolls 52, 53, 82, and 83 also changes.
For this reason, the injection direction of the rolling lubricant L injected from each nozzle 152 of the spray unit 150 is switched (adjusted) between the case of the 10-stage configuration and the case of the 6-stage configuration.

The spray unit 150 includes an injection angle adjustment mechanism 160 that can adjust the injection direction of the rolling lubricating oil L injected from each nozzle 152.
The injection angle adjusting mechanism 160 includes a rotating plate 162 (162a, 162b) in which a gear 162W is formed on a part of the outer periphery and a nozzle 152 is disposed along the radial direction from the center of rotation, and the gear of the rotating plate 162. A worm gear 164 (164a, 164b) that meshes with 162W to rotate the rotating plate 162, a rotating shaft 165 that pivotally supports the worm gear 164, and a motor 165 connected to one end of the rotating shaft 165.

As shown in FIG. 9A, each rotating plate 162 is arranged such that the rotation axis is in the horizontal direction and the nozzle 152 is directed to the work rolls 52 and 53. A worm gear 164 (164a, 164b) is meshed with a gear 162W formed on the outer peripheral surface opposite to the nozzle 152. By rotating the worm gear 164, each nozzle disposed on the rotary plates 162a, 162b. The direction (injection direction) of 152 (nozzles 152a and 82b) changes in the vertical direction.
The twist directions of the worm gears 164a and 164b are opposite to each other. For example, the worm gear 164a is a right-hand screw and the worm gear 164b is a left-hand screw. Therefore, when the rotating shaft 165 that supports the worm gears 164a and 164b is rotated, the rotating plates 162a and 162b rotate in the opposite direction, and the injection directions of the nozzles 152a and 82b also change in the opposite direction.

Therefore, as shown in FIGS. 9A and 9B, when the stage number configuration of the multistage rolling mill 1 is switched, the motor 165 connected to one end of the rotating shaft 165 is driven, so that the nozzle The injection directions of 152a and 82b are adjusted, and the rolling lubricant oil L can be reliably attached to the work rolls 52, 53, 82, and 83.
Thus, even when the stage number configuration of the multistage rolling mill 1 is switched, the rolling lubricant L is secured to the work rolls 52, 53, 82, and 83, so that highly accurate sheet thickness control can be performed.

  The various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above-described embodiment, the case where the number-of-stage switching multi-high rolling mill 1 switches between the 10-stage configuration and the 6-stage configuration has been described, but the present invention is not limited thereto. For example, the pair of upper and lower intermediate rolls 30 and 40 may have only one intermediate roll or may have three or more intermediate rolls. Moreover, the case where each of the pair of upper and lower backup rolls 10 and 20 has three or more backup rolls may be used.

  Moreover, when the number-of-stage switching multi-high rolling mill 1 has a 10-stage configuration, the case where the pair of saddle roll bearings 54 and 57 are disposed at both ends of the pair of work rolls 52 and 53 has been described, but the present invention is not limited thereto. Also in the case of the six-stage configuration, a pair of saddle roll bearings may be arranged at both ends of the pair of work rolls 82 and 83 instead of the axle boxes 84 and 85.

  Moreover, although the case where the stage number switching multi-stage rolling mill 1 is an X-type mill (cluster type) has been described, the present invention can be applied to any type of rolling mill as long as it is a stage number switching type. For example, not only a horizontal rolling mill but a vertical rolling mill may be used. Moreover, a universal type rolling mill may be used.

It is a side view which shows typically the time of 10 step | paragraph structure of the multistage rolling mill according to this invention. It is a side view which shows typically the time of 6-step structure of the multistage rolling mill according to the present invention. It is a perspective sectional view showing the time of 10-stage configuration of a multistage rolling mill for switching the number of stages. It is a front view which shows the time of 10 step | paragraph structure of the stage number change multi-stage rolling mill. It is a figure explaining operation | movement of a work roll and a saddle roll bearing. It is a top view which shows the structure of a heel roll bearing. It is a front view which shows the structure of a heel roll bearing. It is a figure which shows the work roll exchange trolley used at the time of the stage number switching of a stage number switching multi-stage rolling mill. It is a figure which shows the spray part which sprays rolling lubricating oil on a work roll.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Multi-stage rolling mill for switching the number of stages 5 ... Frame 12, 13 ... Backup roll (backup roll pair)
14, 24 ... axle box (backup roll axle box)
16, 26 ... Bending cylinder for decrease 22, 23 ... Backup roll (backup roll pair)
28 ... Lock mechanism 32, 33 ... Intermediate roll (intermediate roll pair)
34, 44 ... axle box (intermediate roll axle box)
36, 46 ... Bending cylinder for ink lease 42, 43 ... Intermediate roll (intermediate roll pair)
52, 53 ... Work roll (work roll pair)
52s, 53s ... end face 54, 57 ... 竪 roll bearing (roll type bearing)
59 ... Supporting part (open / close lever mechanism)
DESCRIPTION OF SYMBOLS 80 ... Spray part 90 ... Injection angle adjustment mechanism 100 ... Work roll exchange trolley 112,113 ... Work roll holding part 120 ... Traveling part S ... Rolled sheet L ... Rolling lubricating oil (liquid)

Claims (5)

A multi-stage rolling mill for switching the number of stages having a work roll pair and an intermediate roll pair removably mounted between backup roll pairs,
A pair of roll bearings disposed at both ends of the work roll pair and abutting against the respective end faces of the work roll pair ;
The pair of roll-type bearings are supported by a backup roll axle box that supports the backup roll pair,
One of the pair of roll-type bearings is supported by the backup roll axle box so as to be separable from one end surface of the work roll pair, and the backup roll extends across one end surface of the work roll pair. A multi-stage rolling mill for switching the number of stages, which is disposed in an open / close lever mechanism supported with respect to the axle box, and is separated in a direction different from the axial direction of the work roll pair when the open / close lever mechanism is open . A work roll exchanging carriage comprising: a grip part that grips one end of the work roll pair; and a traveling part that supports the grip part and is movable in the axial direction of the work roll pair. The multi-stage rolling mill for switching the number of stages according to claim 1. The multistage rolling mill for switching the number of stages according to claim 1 or 2, wherein an increase bending cylinder for bending the intermediate roll pair is disposed in an intermediate roll shaft box that supports the intermediate roll pair . 4. The multistage rolling mill for switching the number of stages according to claim 1, wherein a reduction bending cylinder for bending the intermediate roll pair is disposed in the backup roll shaft box. 5. The stage switching multi-stage rolling according to any one of claims 1 to 4, further comprising: a spray unit that sprays liquid onto the work roll pair and can adjust a jet direction of the liquid. Machine.

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