JP5657159B1 - Roll reduction device - Google Patents

Abstract

The present invention provides a roll reduction device for a round slab that can suppress the occurrence of malfunction and reduce the number of maintenance operations. A roll squeezing apparatus for round slab comprising an upper roll, a lower roll, a rod having a rod head, and an actuator having a main body that reciprocates the rod. The roll 11 and the lower roll 12 are respectively arranged so as to be movable in the vertical direction, the main body 18 is fixed to one of the upper roll 11 and the lower roll A (upper roll 11), and the other roll B ( The rod head 16 is fixed to the lower roll 12), and the main body 18 is disposed above the upper roll 11. [Selection] Figure 1

Description

The present invention relates to a roll reduction device for round slabs.

When a slab is manufactured by a continuous casting method, in order to reduce the occurrence of segregation and porosity (holes) in the slab, reduction is performed on the slab during continuous casting. Since this reduction is performed on the center portion of the slab, in the case of a slab having a rectangular cross section, for example, the reduction is performed by a reduction stand (a reduction device) having a convex roll and a flat roll as a pair. In the case of a slab (round slab), it can be performed by a reduction stand (a reduction device) having the same type, for example, a pair of flat rolls. In the case of rolling down the rectangular slab, even if only the central portion in the width direction is squeezed from the upper side by the convex roll, only the upper side of the slab is squeezed because the pressure receiving area of the lower flat roll is large. Therefore, there is no occurrence of cracking due to the slab being pushed down and bent.

On the other hand, as shown in FIG. 10 (a), when a slab 100 (round slab) having a circular cross section is squeezed by a pair of flat rolls 110, the slab is cast by being squeezed only from one side (upper side) by a hydraulic cylinder 111. The piece 100 is pushed down. In this case, a crack occurs when the slab 100 is bent. Therefore, when the round slab is reduced, as shown in FIG. 10B, hydraulic cylinders 111a and 111b are provided for the upper and lower rolls 110a and 110b, respectively, and both the upper and lower rolls 110a and 110b are reduced. The structure is taken (see Patent Document 1, FIG. 2, etc.). The slab 100 is prevented from bending to one side by reducing the upper and lower rolls 110a and 110b together so that the center position between the upper and lower rolls 110a and 110b does not change. However, when the hydraulic cylinder 111b is provided for the lower roll 110b, the hydraulic cylinder 111b is positioned below the reduction stand (the reduction device). Below the reduction stand is a high-temperature atmosphere due to radiation from the slab 100 or hot air, and is a poor environment in which scales and dust fall and accumulation, roll neck cooling water scatters, and the like. Therefore, malfunctions frequently occur and the maintenance frequency must be increased.

JP 2010-52043 A

This invention is made | formed in view of this situation, and it aims at providing the roll reduction apparatus for round slabs which can suppress generation | occurrence | production of a malfunction and can also reduce the frequency | count of a maintenance.

The roll reduction device according to the present invention that meets the above-mentioned object is a roll reduction device for round cast pieces comprising an upper roll, a lower roll, a rod having a rod head, and an actuator having a main body for reciprocating the rod. The upper roll and the lower roll are each arranged so as to be movable in the vertical direction, the upper roll and the lower roll are connected by the actuator, and one roll A side of the upper roll and the lower roll is It connects with a main-body part side , the other roll B side connects with the said rod head side, and the said main-body part is arrange | positioned above the said upper roll.

In the roll reduction device according to the present invention, the upper roll and the lower roll are connected by an actuator, and by operating the actuator, the upper and lower rolls move together to narrow the interval, that is, the round slab can be reduced. It has become. For this reason, it can be rolled down without bending a round cast piece, maintaining the position of the axis of a round cast piece. In addition, the actuator main body (for example, a cylinder tube in a hydraulic cylinder) is disposed above the upper roll and is not disposed below the poor environment, thereby suppressing the occurrence of malfunction and reducing the number of maintenance. be able to.
“Upper and lower rolls are movable in the vertical direction” means that the round rolls that are normally arranged horizontally can be moved toward and away from the round cast slabs. It is not limited to only. “The roll A side is connected to the main body portion side ” includes the case where the main body portion is indirectly connected to the roll A via another member, and the roll A and the main body portion move integrally. It means being in a state. “The roll B side is connected to the rod head side ” also has the same meaning.

In the roll reduction device according to the present invention, a main body side member that connects the upper roll as the roll A and the main body, and a rod head side that connects the lower roll as the roll B and the rod head. It is preferable to further comprise a member. Thus, when the lower roll and the rod head are connected , the distance between the two rolls can be narrowed by the pulling operation of the rod, and the round cast piece can be rolled down.

In the roll reduction device according to the present invention, a main body side member that connects the lower roll as the roll A and the main body, and a rod head side that connects the upper roll as the roll B and the rod head. It is preferable to further comprise a member. Thus, when the upper roll and the rod head are connected , the distance between both rolls can be reduced by the rod pushing operation, and the round cast piece can be pressed down.

In the roll reduction device according to the present invention, the main body part side member is an arm in which the fulcrum A, the roll A, and the main body part are arranged in this order and rotates around the fulcrum A, and the rod head side member is The fulcrum B, the roll B, and the rod head are preferably arranged in this order, and the arm rotates around the fulcrum B. By using such an arm, the rolling force can be increased by the lever principle.

In the roll reduction device according to the present invention, it is preferable to further include a spacer for controlling the amount of reduction of the upper roll and the lower roll. The distance between the two rolls when being reduced by this spacer is controlled, and the amount of reduction can be controlled.

In the roll reduction apparatus according to the present invention, it is preferable that the apparatus further includes weight adjusting means for applying an upward force to the upper roll and the lower roll. Due to the weight of the roll and actuator, the lower roll may not rise or may not rise easily even if the actuator is operated so as to reduce the distance between both rolls. Therefore, by using a weight adjusting means that relaxes the apparent weight of the actuator fixed to the roll or the roll, the lower roll is likely to rise during the operation of the actuator.

In the roll reduction device according to the present invention, it is preferable to further include a stopper for controlling the downward movement position of the upper roll. Even if the lower roll is difficult to rise as described above, the upper roll that moves (lowers) first when the actuator is operated stops at a predetermined position by the stopper, and the lower roll that has stopped by this is forcibly forced. As a result, both rolls can be finally moved to symmetrical positions.

In the roll reduction device according to the present invention, the actuator is preferably a hydraulic cylinder. By using the hydraulic cylinder, it is possible to effectively perform the reduction work.

According to the roll reduction device according to the present invention, it is possible to suppress the occurrence of malfunction and reduce the number of maintenance.

1 is a schematic perspective view of a roll reduction device according to a first embodiment of the present invention. (A) is a typical side view which shows the state at the time of rolling-down of the roll rolling down apparatus, (b) is a typical front view. (A) is a typical side view which shows the state at the time of roll opening of the roll rolling down apparatus, (b) is a typical front view. (A) is a typical side view which shows the state at the time of rolling-down of the roll rolling device which concerns on the 2nd Embodiment of this invention, (b) is a typical front view. (A) is a typical side view which shows the state at the time of roll opening of the roll rolling down apparatus, (b) is a typical front view. (A) is a typical side view which shows the state at the time of rolling-down of the roll rolling device which concerns on the 3rd Embodiment of this invention, (b) is a typical front view. (A) is a typical side view which shows the state at the time of roll opening of the roll rolling down apparatus, (b) is a typical front view. (A) is a typical side view which shows the state at the time of rolling-down of the roll rolling device which concerns on the 4th Embodiment of this invention, (b) is a typical front view. (A) is a typical side view which shows the state at the time of roll opening of the roll rolling down apparatus, (b) is a typical front view. (A) is explanatory drawing which shows the state which rolled down the round cast piece only from the upper side, (b) is explanatory drawing which shows the state which rolled down the round cast piece from the up-and-down both sides.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
As shown in FIGS. 1 to 3, a roll reduction device 10 according to the first embodiment of the present invention includes an upper roll 11, a lower roll 12, a pair of upper arms 13 that are examples of main body side members, and a rod. A pair of lower arms 14 as an example of a head side member and a pair of hydraulic cylinders 15 as an example of an actuator are mainly provided. The hydraulic cylinder 15 includes a rod 17 having a rod head 16 and a main body 18 that reciprocates the rod 17.
In the schematic side view of FIGS. 2 (a) and 3 (a) and the schematic front view of FIGS. 2 (b) and 3 (b), a hidden portion is provided for ease of explanation. A part of the structure is shown by a solid line (the same applies to all the following schematic side views and schematic front views).

The roll reduction device 10 is used in a continuous casting facility for the round slab 100 and is disposed in the vicinity of a position at which the solidification of the round slab 100 is completed. Support rolls 101 for the round cast slab 100 are arranged before and after the roll reduction device 10.

The upper roll 11 and the lower roll 12 are each arranged so as to be movable in the vertical direction, and form a pair to reduce the round cast slab 100 from above and below. That is, the round slab 100 is conveyed between the upper roll 11 and the lower roll 12. The upper roll 11 and the lower roll 12 may be any of a flat roll, a convex roll, a concave roll, and the like, but are illustrated as a flat roll.

The upper arm 13 is a rod-shaped structure that is arranged in a direction that is substantially horizontal when the pressure is reduced (see FIG. 2A). The upper arm 13 rotates in the vertical direction around a fulcrum 19 (fulcrum A) provided on one end side. The upper arm 13 is connected to a frame 20 so as to be rotatable about a fulcrum 19 as an axis. The frame 20 is erected on the upper surface of the base 28. A main body 18 of the hydraulic cylinder 15 is fixed to the upper surface of the upper arm 13 on the other end side. The main body 18 is disposed so that the rod 17 faces downward. A bearing box 21 is incorporated at an intermediate position of the upper arm 13, and the upper roll 11 is rotatably fixed (supported) to the bearing box 21. That is, the main body 18 is disposed above the upper roll 11. The main body 18 is fixed to the upper roll 11 (roll A), and the fulcrum 19 (fulcrum A), the upper roll 11 (roll A), and the main body 18 are arranged on the upper arm 13 in this order. ing. As the upper arm 13 rotates, the upper roll 11 moves in the vertical direction (rotation movement around the fulcrum 19).

The lower arm 14 is a rod-shaped structure disposed in a direction that is substantially horizontal when being reduced, that is, substantially parallel to the upper arm 13 (see FIG. 2A). The lower arm 14 rotates in the vertical direction around a fulcrum 22 (fulcrum B) provided on one end side. The lower arm 14 is connected to the frame 20 so as to be rotatable about a fulcrum 22 as an axis. A rod head 16 of a rod 17 is fixed to the other end side of the lower arm 14 so as to be rotatable. A bearing box 23 is incorporated at an intermediate position of the lower arm 14, and the lower roll 12 is rotatably fixed (supported) to the bearing box 23. That is, the rod head 16 is fixed to the lower roll 12 (roll B), and the fulcrum 22 (fulcrum B), the lower roll 12 (roll B), and the rod head 16 are arranged on the lower arm 14 in this order. . Further, the lower roll 12 moves in the vertical direction (rotational movement about the fulcrum 22) by the rotation of the lower arm 14.

The hydraulic cylinder 15 has the rod 17 and the main body 18 as described above. The main body 18 includes a piston 24 and a cylinder tube 25 into which the piston 24 is inserted. The main body 18 is fixed to the upper arm 13 so as to be rotatable. The piston 24 is connected to the end of the rod 17 opposite to the rod head 16. The hydraulic cylinder 15 is connected to a hydraulic pump (not shown). The hydraulic cylinder 15 is a double acting type, but may be a pulling type single acting type. The rod 17 is also reciprocated by the reciprocating motion of the piston 24.

The roll reduction device 10 includes an upper spacer 26 disposed on the lower surface of the center position of the upper arm 13 and a lower spacer 27 disposed on the upper surface of the center position of the lower arm 14 (not shown in FIG. 1). The upper spacer 26 and the lower spacer 27 are box-shaped bodies. The total height of the upper spacer 26 and the lower spacer 27 is the distance between the upper roll 11 and the lower roll 12 during the reduction. That is, the amount of reduction of the upper roll 11 and the lower roll 12 is controlled by the upper spacer 26 and the lower spacer 27. The lower spacer 27 (at least one of the spacers) has a layer structure in which the thickness can be adjusted, whereby the amount of reduction (the distance between the two rolls during reduction) can be adjusted.

The roll reduction device 10 includes a spring 29 (an example of a weight adjusting unit) provided between the upper surface of the base 28 and the lower surface of the tip of the lower arm 14 (the fixed portion of the rod head 16) (FIG. 1). (Not shown). The spring 29 is provided in a substantially vertical direction and applies an upward force to the upper roll 11, the lower roll 12, the hydraulic cylinder 15, and the like. That is, the spring 29 supports the upper roll 11, the lower roll 12, the hydraulic cylinder 15, and the like. The force of the spring 29 is appropriately adjusted according to the weight of each of the rolls 11 and 12 and the hydraulic cylinder 15, the reduction force, and the like.

The roll reduction device 10 includes a stopper 30 that protrudes from the side surface of the frame 20. The stopper 30 has a role of stopping the upper arm 13 when the upper arm 13 is lowered to a desired position. That is, the stopper 30 controls the downward movement position of the upper arm 13, that is, the upper roll 11. The stopper 30 has a layer structure in which the upper surface position can be adjusted.

Next, a method for using the roll reduction device 10 will be described. The slab 100 to be rolled is conveyed between the upper roll 11 and the lower roll 12 by a plurality of support rolls 101. The height of the support roll 101 and the like is adjusted so that the center axis height 102 of the round slab 100 is horizontal. When performing the reduction, the hydraulic cylinder 15 is operated from the roll reduction device 10 in the state of FIG. 3 to the state of FIG. Specifically, it is as follows.

3 (a) and 3 (b) is a state in which the rod 17 of the hydraulic cylinder 15 is pulled out. By applying hydraulic pressure to the rod side, the rod 17 is drawn, and a force is generated in such a direction that the distance between the rod head 16 and the main body portion 18 is reduced. As a result, the upper arm 13 rotates downward and the lower arm 14 rotates upward. Due to the movement of the upper arm 13 and the lower arm 14, the upper roll 11 and the lower roll 12 come close to each other, and the round cast piece 100 is pressed down (see FIGS. 2A and 2B).

The upper arm 13 stops moving at a substantially horizontal position by contacting the stopper 30. The lower arm 14 stops moving at a substantially horizontal position when the upper spacer 26 and the lower spacer 27 come into contact with each other. That is, the amount of reduction and the positions of the upper roll 11 and the lower roll 12 during the reduction are determined by the stopper 30 and the upper spacer 26 and the lower spacer 27. The height of the stopper 30, the upper spacer 26 and the lower spacer 27 is adjusted so that the positions of the upper roll 11 and the lower roll 12 during the reduction are symmetrical with respect to the center axis height 102 of the round cast slab 100. Has been. Further, the lower arm 14 is easily raised by the spring 29.

According to the roll reduction device 10, by operating the common hydraulic cylinder 15 of the upper roll 11 and the lower roll 12 in this way, the upper roll 11 moves downward and the lower roll 12 moves upward to shorten the interval. ing. For this reason, the center axis height 102 of the round slab 100 does not shift, and the round slab 100 can be rolled down without being bent. Moreover, since the main body 18 of the hydraulic cylinder 15 is disposed above the upper roll 11 and not disposed below the lower roll 12, which is a poor environment, the occurrence of malfunctions and the number of maintenance operations can be reduced. Can do. The conventional roll reduction device in which a hydraulic cylinder is arranged below the lower roll requires maintenance once a month. However, the roll reduction device 10 requires a maintenance frequency of about once a year. Reduced. Further, since the roll reduction device 10 does not need to be provided with a hydraulic cylinder at the bottom, it is not necessary to modify the foundation when improving the existing device. That is, it is possible to modify the existing apparatus relatively easily, and the modification work can be performed in a short period of time.

(Second Embodiment)
As shown in FIGS. 4 and 5, the roll reduction device 40 according to the second embodiment of the present invention includes an upper roll 41, a lower roll 42, and a hydraulic cylinder 43. These structures can refer to the upper roll 11, the lower roll 12, and the hydraulic cylinder 15 of the roll reduction device 10 according to the first embodiment, respectively.

The roll reduction device 40 includes a bearing box 44 and a flat plate material 45 as main body side members. The upper roll 41 (roll A) is rotatably fixed to the lower surface of the flat plate material 45 via a bearing box 44. The main body portion 46 of the hydraulic cylinder 43 is fixed to the upper surface of the flat plate material 45 so that the rod 47 extends downward. The flat plate 45 is provided with a hole (not shown) through which the rod 47 passes.

The roll reduction device 40 includes a bearing box 48 as a rod head side member. The lower roll 42 (roll B) is rotatably fixed to the bearing housing 48. The rod head 49 of the hydraulic cylinder 43 is also fixed to the bearing box 48.

An upper spacer 51 is provided below the bearing box 44, and a lower spacer 52 is provided above the bearing box 48. The lower spacer 52 is configured to be adjustable in thickness (height).

The roll reduction device 40 includes a frame 50 that is substantially U-shaped in a side view. The frame 50 guides the vertical movement of the upper roll 41 and the lower roll 42. Inside the frame 50, a bearing box 44 of the upper roll 41 and a bearing box 48 of the lower roll 42 are arranged so as to be vertically movable. A stopper 53 for controlling the downward movement position of the bearing box 44 (upper roll 41) is provided on the inner surface of the frame 50. The stopper 53 is configured to be adjustable in height. A spring 54 that applies an upward force to the lower roll 42 and indirectly to the upper roll 41 is disposed on the upper surface of the bottom plate of the frame 50.

Next, a method for using the roll reduction device 40 will be described. 5 (a) and 5 (b) is a state in which the rod 47 of the hydraulic cylinder 43 is pulled out. By applying hydraulic pressure, the rod 47 is pulled in, and a force is generated in such a direction that the distance between the rod head 49 and the main body 46 is reduced. As a result, the bearing housing 44 and the upper roll 41 move downward, and the bearing housing 48 and the lower roll 42 move upward, and the round cast 100 is pressed down by the upper roll 41 and the lower roll 42 (FIG. 4A, ( b)). Similar to the roll reduction device 10, the upper and lower spacers 51, 52 and the stopper 53 move the upper roll 41 and the lower roll 42 to symmetrical positions with respect to the center axis height 102 of the round slab 100. Press down. Further, the lower roll 42 side can be easily moved upward by the spring 54.

(Third embodiment)
As shown in FIGS. 6 and 7, a roll reduction device 60 according to a third embodiment of the present invention includes an upper roll 61, a lower roll 62, a hydraulic cylinder 63, and a substantially U-shaped frame 64 in side view. Prepare. These structures can be referred to those provided in the roll reduction device 40 according to the second embodiment. However, when the hydraulic cylinder 63 is a single-acting type, a push-type hydraulic cylinder is used.

The roll reduction device 60 includes an inverted U-shaped frame 65 and a bearing box 66 as main body side members. The inverted U-shaped frame 65 includes a flat plate portion 69 and a vertical plate portion 70 that extends downward from both ends of the lower surface of the flat plate portion 69. The main body 67 of the hydraulic cylinder 63 is fixed to the upper surface of the flat plate portion 69 so that the rod 68 extends downward. The flat plate portion 69 is provided with a hole (not shown) through which the rod 68 passes. The bearing box 66 is connected to the lower end of the vertical plate portion 70, and fixes (supports) the lower roll 62 (roll A) rotatably. That is, the inverted U-shaped frame 65 and the bearing box 66 (main body side member) fix the lower roll 62 (roll A) and the main body 67.

The roll reduction device 60 includes a bearing box 71 as a rod head side member. The upper roll 61 (roll B) is rotatably fixed to the bearing housing 71. The rod head 72 of the hydraulic cylinder 63 is also fixed to the bearing box 71.

An upper spacer 73 is provided below the bearing box 71, and a lower spacer 74 is provided above the bearing box 66. The lower spacer 74 is configured to be adjustable in thickness (height). A stopper 75 that controls the downward movement position of the bearing box 71 (upper roll 61) is provided on the inner side surface of the frame 64. The stopper 75 is configured to be adjustable in height. On the upper surface of the bottom plate of the frame 64, a spring 76 that applies an upward force to the lower roll 62 and indirectly to the upper roll 61 is disposed.

Next, a method for using the roll reduction device 60 will be described. 7 (a) and 7 (b) is a state in which the rod 68 of the hydraulic cylinder 63 is contracted (the rod 68 is drawn into the main body 67). By applying hydraulic pressure to the head side, the rod 68 is pushed out, and a force is generated in such a direction that the distance between the rod head 72 and the bearing housing 66 decreases. Accordingly, the upper roll 61 moves downward, the lower roll 62 is lifted (moves upward), and the round slab 100 is pressed down by the upper roll 61 and the lower roll 62 (FIGS. 6A and 6B). )reference). By the upper spacer 73 and the lower spacer 74 and the stopper 75, the upper roll 61 and the lower roll 62 can be moved and squeezed to a position symmetrical with respect to the central axis height 102. Further, the lower roll 62 side can be easily moved upward by the spring 76.

(Fourth embodiment)
As shown in FIGS. 8A, 8B, 9A, and 9B, the roll reduction device 80 according to the fourth embodiment of the present invention includes an upper roll 11, a lower roll 12, and an upper roll. An arm 81, a lower arm 14, a hydraulic cylinder 15 and a frame 20 are provided. Since the roll reduction device 80 is the same as the roll reduction device 10 according to the first embodiment except for the upper arm 81 (an example of a main body side member), the same number is assigned and description thereof is omitted.

The upper arm 81 is different from the upper arm 13 of the roll reduction device 10 in that the upper arm 81 extends to the opposite side of the upper roll 11 with respect to the fulcrum 82 (fulcrum A). A counterweight 83 serving as a weight adjusting means is disposed in a portion of the upper arm 81 that extends to the opposite side of the upper roll 11 with respect to the fulcrum 82. The counterweight 83 applies an upward force to the upper roll 11 and indirectly to the lower roll 12. Thereby, when the hydraulic cylinder 15 is operated, the lower arm 14 (lower roll 12) is easily lifted. The counterweight 83 is structured to be separated into a plurality of parts so that the weight can be adjusted. The method of using the roll reduction device 80 is the same as that of the roll reduction device 10 according to the first embodiment.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and the configuration thereof can be changed without changing the gist of the present invention, and a configuration in which the embodiments are combined can also be adopted. For example, a structure in which the first embodiment and the third embodiment are combined may be employed. Specifically, in a structure including an upper arm to which an upper roll is fixed and a lower arm to which a lower roll is fixed, a rod head is fixed to the upper arm (upper roll), and the lower arm (lower roll) is fixed. On the other hand, the actuator main body may be fixed. Even in this case, the main body of the actuator is disposed above the upper arm (upper roll), but the main body is not fixed to the upper arm. In addition, a guide for enabling a stable vertical movement of the main body unit integrated with the lower arm can be provided.

As the actuator, any actuator that outputs a reciprocating motion may be used, and a fluid pressure cylinder other than the hydraulic cylinder, an electric cylinder, or the like can be used. In addition, the spacer may be provided only on one of the upper or lower arms as long as the distance between the two rolls (the amount of reduction) can be controlled. The spacer may be attached to a frame or the like in addition to the arm (the main body side member and the rod head side member).

Furthermore, the roll reduction device of the present invention may not include a stopper or a spacer. The rolling force (for example, about 200 t) on the round slab in the continuous casting facility is very large compared to the total weight (for example, about 10 t) of the upper and lower rolls and the hydraulic cylinder. Therefore, even if there is no stopper or spacer, when the hydraulic cylinder is operated, the upper roll side first moves downward, but when the upper roll comes into contact with the round slab, the lower roll is lifted thereafter. Thereby, it is possible to perform the reduction while suppressing the bending of the round cast slab. However, by using a roll reduction device provided with a stopper and a spacer, it becomes possible to make the bending of the round cast piece during reduction closer to zero.

10: roll reduction device, 11: upper roll, 12: lower roll, 13: upper arm, 14: lower arm, 15: hydraulic cylinder, 16: rod head, 17: rod, 18: main body, 19: fulcrum, 20 : Frame, 21: bearing box, 22: fulcrum, 23: bearing box, 24: piston, 25: cylinder tube, 26: upper spacer, 27: lower spacer, 28: base, 29: spring, 30: stopper, 40: roll reduction device, 41: upper roll, 42: lower roll, 43: hydraulic cylinder, 44: bearing box, 45: flat plate material, 46: main body, 47: rod, 48: bearing box, 49: rod head, 50: frame, 51: upper spacer, 52: lower spacer, 53: stopper, 54: spring, 60: roll reduction device, 61: upper roll, 62: lower roll, 63: hydraulic pressure Linda, 64: frame, 65: inverted U-shaped frame, 66: bearing box, 67: main body, 68: rod, 69: flat plate portion, 70: vertical plate portion, 71: bearing box, 72: rod head, 73 : Upper spacer, 74: lower spacer, 75: stopper, 76: spring, 80: roll reduction device, 81: upper arm, 82: fulcrum, 83: counterweight, 100: round slab, 101: support roll, 102 : Center axis height

Claims (8)

In a roll reduction device for a round slab comprising an upper roll, a lower roll, a rod having a rod head and an actuator having a main body for reciprocating the rod,
The upper roll and the lower roll are each arranged to be movable in the vertical direction,
The upper roll and the lower roll are connected by the actuator , one roll A side of the upper roll and the lower roll is connected to the main body side, and the other roll B side is connected to the rod head side. The roll reduction device, wherein the main body is disposed above the upper roll. The roll reduction device according to claim 1,
A main body side member that connects the upper roll as the roll A and the main body, and a rod head side member that connects the lower roll as the roll B and the rod head are further provided. Roll reduction device. The roll reduction device according to claim 1,
A main body side member that connects the lower roll as the roll A and the main body, and a rod head side member that connects the upper roll as the roll B and the rod head are further provided. Roll reduction device. In the roll reduction device according to claim 2 or 3,
The main body side member is an arm that is arranged around the fulcrum A, the roll A, and the main body in this order, and rotates around the fulcrum A.
The roll reduction device, wherein the rod head side member is an arm in which the fulcrum B, the roll B, and the rod head are arranged in this order and rotate around the fulcrum B. In the roll reduction device according to any one of claims 1 to 4,
A roll reduction device, further comprising a spacer for controlling a reduction amount of the upper roll and the lower roll. In the roll reduction device according to any one of claims 1 to 5,
A roll reduction device, further comprising weight adjusting means for applying an upward force to the upper roll and the lower roll. In the roll reduction device according to any one of claims 1 to 6,
A roll reduction device, further comprising a stopper for controlling a downward movement position of the upper roll. In the roll reduction device according to any one of claims 1 to 7,
A roll reduction device, wherein the actuator is a hydraulic cylinder.

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