Replacement table for rolling mill roll changing device, roll changing device, method for controlling circumferential position of roll during roll replacement of rolling mill, and method for inserting roll into rolling mill

Abstract

The present invention comprises: two roll holding sections, namely a working-side roll holding section 310 and a driving-side roll holding section 320, each of which having at least two from among a rubber roller 316 and wheels 317, 321, 322, that hold respective necks 4A3, 4C3, 4D3, 4F3 of a second intermediate roll 4 from below; and a support beam 330 connected to the two working-side and driving-side roll holding sections 310 and 320, wherein the rubber roller 316 provided to the working-side roll holding section 310 on the near side in the direction of insertion of the support beam 330 into a multistage rolling mill 200 is formed from a material with a higher coefficient of friction than the other wheel 317, 321, 322. The present invention further comprises: a proximity sensor 315 that detects the circumferential position of the necks 4A3, 4C3, 4D3, 4F3; and a motor 311, a pulley 313, a rotary shaft 318, and a belt 314 that impart a rotary driving force to the rubber rollers 316 and control rotary driving of the rubber rollers 316 on the basis of a signal detected by the proximity sensor 315.

Description

Rolling mill roll changing device exchange table, roll changing device, method for controlling circumferential position of roll when changing rolls in a rolling mill, and method for inserting a roll into a rolling mill

[0001] The present invention relates to an exchange table for a roll changing device of a rolling mill, a roll changing device, a method for controlling the circumferential position of a roll when changing rolls in a rolling mill, and a method for inserting a roll into a rolling mill.

[0002] Patent document 1 describes a robot system for an installation for rolling metal strip, which is suitable for carrying out operations involving the exchange of roll mill rolls by removing used rolls from the mill stand and depositing them on a transversely arranged rack, and / or inserting new or reconditioned rolls into the mill stand from the rolls arranged on the rack.

[0003] French Patent Publication No. 3122108

[0004] In a cluster-type rolling mill, for example, a total of 12 or 20 rolls (upper and lower) are housed in the space within the housing, and when changing rolls (in this specification, the removal and installation of rolls from the rolling mill is collectively referred to as "changing"), the rolls must be changed in a limited space because the roll intervals are narrow. Moreover, the change of heavy rolls such as second intermediate rolls and backup rolls in particular involves a great risk of damage due to operational error.

[0005] Therefore, for example, Patent Document 1 describes a robot that grips the ends (cylinders) of rolls to rearrange the rolls.

[0006] However, in the above-mentioned conventional technology, the roll is supported only on one side, which is a so-called cantilever structure, and therefore the deflection of the roll is large, making the work of inserting and extracting the roll horizontally in the roll synchronization direction unstable and increasing the amount of checking work required up close, so there is room for improvement in terms of safe reassembly.

[0007] The present invention provides an exchange table for a roll changing device of a rolling mill, which enables roll changing work to be performed more safely and easily than in the past, a roll changing device, a method for controlling the circumferential position of a roll when changing rolls in a rolling mill, and a method for inserting a roll into a rolling mill.

[0008] The present invention includes a plurality of means for solving the above-mentioned problems, and one example thereof is an exchange table for a changing device for changing the rolls of a rolling mill, the exchange table comprising two roll holding parts that hold the necks of the rolls from below and each have at least two wheels, and a support beam connected to the two roll holding parts, the drive wheel being the wheel provided on the roll holding part on the front side in the direction of insertion of the support beam into the rolling mill being made of a material with a higher friction coefficient than the other wheels, a sensor that detects the circumferential position of the neck, and a drive unit that applies a rotational drive force to the drive wheel and controls the rotational drive of the drive wheel based on a signal detected by the sensor.

[0009] According to the present invention, roll changing work can be performed more safely and easily than in the past. Objects, configurations and effects other than those described above will become apparent from the following description of the embodiments.

[0010] 1 is a front view showing an outline of a multi-stage rolling mill that is the target of roll changing by a roll changing device equipped with an exchange table for a rolling mill roll changing device of an embodiment; FIG. 2 is a view showing an outline of a roll changing device equipped with an exchange table for a rolling mill roll changing device of an embodiment; FIG. 3 is a top view showing an outline of a second second intermediate roll changing table of an embodiment; FIG. 4 is a side view showing an outline of a second second intermediate roll changing table of an embodiment; FIG. 5 is a top view showing an outline of a first second intermediate drive roll changing table of an embodiment; FIG. 6 is a side view showing an outline of a relationship between the first second intermediate drive roll changing table and the second intermediate roll to be gripped of an embodiment; FIG. 7 is a top view showing an outline of a relationship between the first second intermediate drive roll changing table and the second intermediate roll to be gripped of an embodiment; FIG. 8 is a front view showing a state of a multi-stage rolling mill immediately before start of roll changing by the roll changing device of an embodiment; FIG. 9 is a front view showing a state when a bottom second intermediate roll is removed by the roll changing device of an embodiment; FIG. 10 is a schematic view showing a state inside a multi-stage rolling mill when a bottom second intermediate roll is removed by the roll changing device of an embodiment; Schematic diagram showing the state inside a multi-stage rolling mill when a bottom second intermediate roll is removed by the roll changing device of the embodiment. A front view showing the state when an upper second intermediate driven left roll is removed by the roll changing device of the embodiment. A schematic diagram showing the state inside a multi-stage rolling mill when an upper second intermediate driven left roll is removed by the roll changing device of the embodiment. A front view showing the state when an upper second intermediate driven left roll is removed by the roll changing device of the embodiment. A schematic diagram showing the state inside a multi-stage rolling mill when an upper second intermediate driven left roll is removed by the roll changing device of the embodiment. A schematic diagram showing the state when an upper second intermediate roll is removed by the roll changing device of the embodiment. A schematic diagram showing the state inside a multi-stage rolling mill when an upper second intermediate roll is removed by the roll changing device of the embodiment. A schematic diagram showing the state inside a multi-stage rolling mill when an upper second intermediate roll is removed by the roll changing device of the embodiment. A schematic diagram showing the state inside a multi-stage rolling mill when an upper second intermediate roll is removed by the roll changing device of the embodiment. A front view showing the state of a multi-stage rolling mill in a state where all second intermediate rolls have been removed by the roll changing device of the embodiment. 1 is a front view showing a state in which an upper second intermediate drive left roll is installed by the roll changing device of the embodiment. 2 is a diagram showing an outline of a method of aligning a circumferential position when installing an upper second intermediate drive roll by the roll changing device of the embodiment. 3 is a schematic diagram showing a state inside a multi-stage rolling mill when installing an upper second intermediate drive right roll by the roll changing device of the embodiment.

[0011] Embodiments of the exchange table for a roll changing device for a rolling mill, the roll changing device, the method for controlling the circumferential position of a roll when changing rolls in a rolling mill, and the method for inserting a roll into a rolling mill according to the present invention will be described with reference to FIGS. 1 to 22.

[0012] In the drawings used in this specification, identical or corresponding components are denoted by the same or similar reference numerals, and repeated description of these components may be omitted.

[0013] First, the overall configuration of a multi-stage rolling mill 200 that is the target of roll replacement by an exchange carriage 100 equipped with a drive roll exchange carriage 300 and an idle roll exchange carriage 400 will be described with reference to Figure 1. Figure 1 shows an overview of the multi-stage rolling mill 200 that is the target of roll replacement by the exchange carriage 100 of the embodiment.

[0014] 1, the multi-stage rolling mill 200 of this embodiment is a cluster-type 20-stage rolling mill for rolling a strip 1, and is particularly suitable for rolling hard materials such as stainless steel sheets, electromagnetic steel sheets, copper alloys, etc. Note that the number of stages is not limited to 20, and may be 12.

[0015] In FIG. 1 , the multi-stage rolling mill 200 is equipped with a pair of upper and lower work rolls 2 (upper work roll 2A, lower work roll 2B), two pairs of upper and lower first intermediate rolls 3 (upper first intermediate rolls 3A, 3B, lower first intermediate rolls 3C, 3D), three pairs of upper and lower second intermediate rolls 4 (upper second intermediate drive left roll 4A, upper second intermediate roll 4B, upper second intermediate drive right roll 4C, lower second intermediate drive right roll 4D, lower second intermediate roll 4E, and lower second intermediate drive left roll 4F), and four pairs of upper and lower backup rolls 5 (first upper backup roll A, second upper backup roll B, third upper backup roll C, fourth upper backup roll D, first lower backup roll E, second lower backup roll F, third lower backup roll G, and fourth lower backup roll H) each consisting of a split backing bearing, a shaft, and a roof tile 7.

[0016] As shown in FIG. 1, a pair of upper and lower work rolls 2 roll a strip 1, which is a material to be rolled.

[0017] The upper work roll 2A on the vertically upper side of the strip 1 is supported in contact with the upper first intermediate rolls 3A and 3B, and the lower work roll 2B on the vertically lower side of the strip 1 is supported in contact with the lower first intermediate rolls 3C and 3D.

[0018] In addition, the upper first intermediate rolls 3A and 3B are supported in contact with the upper second intermediate driving left roll 4A, the upper second intermediate roll 4B, and the upper second intermediate driving right roll 4C, and the lower first intermediate rolls 3C and 3D are supported in contact with the lower second intermediate driving right roll 4D, the lower second intermediate roll 4E, and the lower second intermediate driving left roll 4F.

[0019] The "right" and "left" of the upper second intermediate drive left roll 4A, the upper second intermediate drive right roll 4C, the lower second intermediate drive right roll 4D, and the lower second intermediate drive left roll 4F refer to the positional relationship when viewed from FIG. 1, and "right" means the side in the rolling advance direction, and "left" means the side opposite to the rolling advance direction.

[0020] Of the three pairs of upper and lower second intermediate rolls 4, the upper second intermediate left drive roll 4A, the upper second intermediate roll 4B, and the upper second intermediate right roll 4C located vertically above the strip 1 are supported in contact with the first upper backup roll A, the second upper backup roll B, the third upper backup roll C, and the fourth upper backup roll D of the backup rolls 5 located vertically above the strip 1. In addition, the lower second intermediate right drive roll 4D, the lower second intermediate roll 4E, and the lower second intermediate left roll 4F located vertically below the strip 1 are supported in contact with the first lower backup roll E, the second lower backup roll F, the third lower backup roll G, and the fourth lower backup roll H of the backup rolls 5 located vertically below the strip 1.

[0021] Each of these eight backup rolls 5 is supported by its roof tile 7 on the upper mill housing 25 or the lower mill housing 26, and is fixed to the upper mill housing 25 or the lower mill housing 26 by the clamping action of the roof tile clamp 23. The housing is not limited to a configuration consisting of the upper mill housing 25 and the lower mill housing 26, which are divided into upper and lower parts, but may also be a monoblock housing in which the upper and lower housings are integrated.

[0022] Furthermore, in the multi-stage rolling mill 200 of this embodiment, an exchange carriage 100 as shown in FIG. 2 is provided on the operation side of the upper mill housing 25 and the lower mill housing 26.

[0023] Next, the overall configuration of the exchange carriage 100 equipped with the drive roll exchange table 300 and the idle roll exchange table 400 will be described with reference to Fig. 2. Fig. 2 shows an outline of the roll changing device of the embodiment.

[0024] The exchange carriage 100 shown in FIG. 2 includes a carriage 110, wheels 112, an X-axis direction movable part 120, a Y-axis direction movable part 122, a Z-axis direction movable part 124, an idle roll exchange table 400 (see FIGS. 3 and 4), a drive roll exchange table 300 (see FIG. 5, etc.), and the like.

[0025] In Figure 2 etc., the X axis (orthogonal direction) is the rolling direction of the multi-stage rolling mill 200, the Y axis (axial direction) is the axial direction of the work rolls 2, first intermediate rolls 3, second intermediate rolls 4, and backup rolls 5 provided in the multi-stage rolling mill 200, and the Z axis (vertical direction) is the direction perpendicular to the plane formed by the X axis direction and the Y axis direction.

[0026] The carriage 110 has a plurality of wheels 112 on its bottom surface, and the wheels 112 run on rails arranged on the ground of the factory where the multi-high rolling mill 200 is installed, so that the carriage 110 can run in the axial direction of the second intermediate rolls 4 provided in the multi-high rolling mill 200. Note that the carriage 110 may also be able to run in a direction other than the axial direction of the second intermediate rolls 4.

[0027] An exchange table gripping device 130 is attached to the driving side tip of the Y-axis direction movable part 122. This exchange table gripping device 130 is a mechanism that is moved in and out of the multi-stage rolling mill 200 together with the Y-axis direction movable part 122, and is a mechanism that makes it possible to attach and detach the idle roll exchange table 400 and the drive roll exchange table 300 to and from the tip of the Y-axis direction movable part 122.

[0028] FIG. 3 shows an outline of the second intermediate roll exchange table of the embodiment as seen from above, and FIG. 4 shows an outline of the second intermediate roll exchange table of the embodiment.

[0029] The idle roll exchange stand 400 shown in FIGS. 3 and 4 is a jig configured to be detachable from the exchange stand gripping device 130, and includes a roll body receiving portion 440, a work-side roll neck receiving portion 430, a drive-side roll neck receiving portion 432, a roll bearing receiving portion 450, bearing protrusion receiving portions 420 and 422, a clamp portion 460, etc.

[0030] This idle roll exchange table 400 is an exchange table for holding rolls that is attached to the exchange table gripping device 130 when changing the upper second intermediate roll 4B and the lower second intermediate roll 4E of the multi-stage rolling mill 200, and is equipped with a roll body receiving portion 440 that serves as a support beam and bearing protrusion receiving portions 420, 422 that serve as roll holding portions, the two bearing protrusion receiving portions 420, 422 being provided at the bottom of the roll body receiving portion 440, and the back side of the two bearing protrusion receiving portions 420, 422 in the direction of insertion of the roll body receiving portion 440 into the multi-stage rolling mill 200 has recesses for engaging the bearing protrusions 4E1, 4E2 provided on the bearing box of the lower second intermediate roll 4E.

[0031] The roll body receiving portion 440 serves as a support beam when removing and attaching the lower second intermediate roll 4E, and serves to support the roll body when removing and attaching the upper second intermediate roll 4B.

[0032] The work-side roll neck support portion 430 supports the work-side roll neck of the upper second intermediate roll 4B when the upper second intermediate roll 4B is removed or attached, and the drive-side roll neck support portion 432 supports the drive-side roll neck of the upper second intermediate roll 4B when the upper second intermediate roll 4B is removed or attached.

[0033] The roll bearing support 450 is a portion that supports the working-side bearing of the upper second intermediate roll 4B. The drive-side bearing is supported on the idle roll exchange table 400 on the tip side of the drive-side roll neck support 432.

[0034] As described above, the bearing protrusion receiving portions 420, 422 are portions having recesses for receiving the bearing protrusions 4E1, 4E2 provided on the bearing box of the lower second intermediate roll 4E, and are portions that hold the lower second intermediate roll 4E when removing and installing the lower second intermediate roll 4E.

[0035] The clamping portion 460 is a portion for attaching the idle roll exchange table 400 to the pair of upper and lower exchange table gripping devices 130 .

[0036] Figure 5 shows an overview of the first second intermediate drive roll exchange table of the embodiment when viewed from above, Figure 6 shows an overview of the relationship between the first second intermediate drive roll exchange table of the embodiment and the second intermediate roll to be gripped when viewed from the side, and Figure 7 shows an overview of the relationship between the first second intermediate drive roll exchange table of the embodiment and the second intermediate roll to be gripped when viewed from above.

[0037] The drive roll exchange table 300 shown in Figures 5, 6, and 7 is configured to be detachable from the exchange table gripping device 130, and is a jig for the exchange carriage 100 for removing and attaching the upper second intermediate drive left roll 4A, the upper second intermediate drive right roll 4C, the lower second intermediate drive right roll 4D, and the lower second intermediate drive left roll 4F among the second intermediate rolls 4 of the multi-stage rolling mill 200, and is configured with a work-side roll holding unit 310, a drive-side roll holding unit 320, a support beam 330, a clamp unit 350, etc.

[0038] In particular, when installing the upper second intermediate drive left roll 4A, the upper second intermediate drive right roll 4C, the lower second intermediate drive right roll 4D, and the lower second intermediate drive left roll 4F, this drive roll exchange table 300 automatically aligns the roll circumferential positions when inserted into the upper mill housing 25 or the lower mill housing 26, thereby automatically achieving engagement between the roll-side couplings 4A2, 4C2, 4D2, 4F2 and the rolling mill-side coupling 52C2 of the drive unit 50C of the multi-stage rolling mill 200 (only the upper second intermediate drive right roll 4C side is illustrated here).

[0039] As shown in FIG. 5 etc., the work-side roll holding unit 310 is a member that holds the necks 4A3, 4C3, 4D3, and 4F3 of the upper second intermediate driving left roll 4A, the upper second intermediate driving right roll 4C, the lower second intermediate driving right roll 4D, and the lower second intermediate driving left roll 4F from below, and in addition to rubber rollers 316 and wheels 317, has a proximity sensor 315, a motor 311, a pulley 313, a belt 314, a rotating shaft 318, etc.

[0040] The proximity sensor 315 is a sensor that detects the distance from marks provided on the necks 4A3, 4C3, 4D3, and 4F3 as the circumferential position of the necks 4A3, 4C3, 4D3, and 4F3. In this embodiment, the marks are roll-side protrusions 4A4, 4C4, 4D4, and 4F4 provided on the necks 4A3, 4C3, 4D3, and 4F3, as shown in FIG. 21 (described later).

[0041] Furthermore, the configuration is not limited to detecting the distance to the roll-side protrusions 4A4, 4C4, 4D4, 4F4 provided on the necks 4A3, 4C3, 4D3, 4F3, and various known configurations can be adopted as long as they can detect the circumferential positions of the necks 4A3, 4C3, 4D3, 4F3. For example, a reflecting member provided on the necks 4A3, 4C3, 4D3, 4F3 and a light source and optical sensor on the drive roll exchange table 300 side can be used.

[0042] The rubber roller 316 is provided on the work side roll holding section 310 on the front side in the direction of insertion of the support beam 330 into the multi-stage rolling mill 200, and is made of a material with a higher friction coefficient than the wheel 317 provided on the work side roll holding section 310 and the wheels 321, 322 provided on the drive side roll holding section 320 side, for example, a drive wheel with rubber on its outer periphery, and the outer periphery is preferably made of a material with a friction coefficient of 0.5 or more.

[0043] The motor 311, pulley 313, rotating shaft 318, and belt 314 are provided in the work side roll holding section 310 on the work side, which is the front side in the direction of insertion of the support beam 330 into the multi-stage rolling mill 200, as a drive device that applies a rotational driving force to the rubber roller 316 and controls the rotational driving of the rubber roller 316 based on a signal detected by the proximity sensor 315.

[0044] Motor 311 is a motor that generates a rotational force in rotating shaft 318 to rotate rubber roller 316 based on a signal detected by proximity sensor 315, and drives rubber roller 316 to rotate by rotating pulley 313 connected to rubber roller 316 in conjunction with the movement of belt 314 connected to rotating shaft 318.

[0045] The drive side roll holding section 320 is a part that holds the necks 4A3, 4C3, 4D3, and 4F3 of the upper second intermediate drive left roll 4A, the upper second intermediate drive right roll 4C, the lower second intermediate drive right roll 4D, and the lower second intermediate drive left roll 4F from below, and has two wheels 321 and 322.

[0046] The support beam 330 connects the two work-side roll holding portions 310 and the drive-side roll holding portion 320 .

[0047] The clamping section 350 is a section for attaching the drive roll exchange table 300 to the pair of upper and lower exchange table gripping devices 130 .

[0048] Returning to FIG. 2 , the X-axis direction movable unit 120 is a part that adjusts the respective positions of the drive roll exchange table 300 and the idle roll exchange table 400 in the X-axis direction relative to the Y-axis direction and the Z-axis direction; the Y-axis direction movable unit 122 is a part that adjusts the respective axial positions of the drive roll exchange table 300 and the idle roll exchange table 400 in the Y-axis direction; and the Z-axis direction movable unit 124 is a part that adjusts the respective positions of the drive roll exchange table 300 and the idle roll exchange table 400 in the vertical direction.

[0049] The X-axis direction movable unit 120, the Y-axis direction movable unit 122, and the Z-axis direction movable unit 124 are configured, for example, by a robot arm that is movable in three axes. Note that, in order to enable translational movement of a total of six second intermediate rolls 4, the load capacity is set to be large enough to support these rolls.

[0050] FIG. 8 shows the state of a multi-stage rolling mill in preparation for starting roll replacement using the roll changing device of the embodiment.

[0051] First, in the multi-stage rolling mill 200 shown in Figure 1, the space between the upper mill housing 25 and the lower mill housing 26 is opened using various known configurations, such as hydraulic cylinders provided at the four corners of the top surface of the upper mill housing 25.

[0052] Thereafter, in order to ensure space for the replacement work, the coolant spray header 9 is moved to a position where there is minimal interference when removing the pair of upper and lower work rolls 2 and the two pairs of upper and lower first intermediate rolls 3, and then these rolls are removed in the above order from the side where the replacement carriage 100 is located. This completes the initial state for roll removal by the replacement carriage 100 of this embodiment shown in Figure 8. Thereafter, the roll replacement work begins using the replacement carriage 100 of the embodiment shown in Figure 2.

[0053] Below, the process of holding the second intermediate roll 4 to be replaced and removing it from the multi-stage rolling mill 200, inserting the replacement second intermediate roll 4 into the inside of the multi-stage rolling mill 200, and attaching the replacement second intermediate roll 4 to the multi-stage rolling mill 200 will be described with reference to Figures 8 to 21.

[0054] Below, we will explain a case where (1) the coolant spray header 9 is swung to expand the space, and then (2) the lower second intermediate roll 4E, (3) the upper second intermediate right drive roll 4C, (4) the lower second intermediate right drive roll 4D, (5) the upper second intermediate left drive roll 4A, (6) the lower second intermediate left drive roll 4F, and (7) the upper second intermediate roll 4B are removed in this order, but this order is not limited to this. For example, the above-mentioned (3) and (4) may be reversed, and (5) and (6) may be reversed.

[0055] First, the removal of the second lower intermediate roll 4E will be described with reference to Figures 9 to 11. Figure 9 shows the state when the second lower intermediate roll is removed by the roll changing device of the embodiment, and Figures 10 and 11 show the state inside the multi-stage rolling mill when the second lower intermediate roll is removed by the roll changing device of the embodiment.

[0056] First, the idle roll exchange table 400 is attached to the pair of upper and lower exchange table gripping devices 130 shown in Figure 2, and the Y-axis direction movable part 122 is driven to start inserting the idle roll exchange table 400 between the upper mill housing 25 and the lower mill housing 26 at a position vertically above the lower second intermediate roll 4E. The axial insertion position at this time is set to the point where the bearing projection receiving parts 420, 422 provided on the underside of the idle roll exchange table 400 are just in front of the bearing projections 4E1, 4E2 on the lower second intermediate roll 4E side.

[0057] Next, as shown in FIG. 10, the idle roll exchange table 400 is lowered by the Z-axis direction movable part 124 until the height positions of the bearing projection receiving parts 420, 422 and the bearing projections 4E1, 4E2 are aligned.

[0058] 11 , the Y-axis direction movable part 122 is driven again to insert the bearing protrusions 4E1, 4E2 on the lower second intermediate roll 4E into the bearing protrusion receiving portions 420, 422 of the idle roll exchange table 400. After the insertion, the Y-axis direction movable part 122 is driven in the opposite direction to extract the lower second intermediate roll 4E together with the idle roll exchange table 400 from the lower mill housing 26.

[0059] Next, the removal of the upper second intermediate driven right roll 4C will be described with reference to Figures 12 to 15. Figures 12 and 14 show the state when the upper second intermediate driven left roll is removed by the roll changing device of the embodiment, and Figures 13 and 15 show the state inside the multi-high rolling mill when the upper second intermediate driven left roll is removed by the roll changing device of the embodiment.

[0060] When removing the upper second intermediate right driving roll 4C, first, the idle roll exchange table 400 is removed from the exchange table gripping device 130 and the drive roll exchange table 300 is attached.

[0061] To be precise, the drive roll exchange table 300 shown in Figure 5 and the like is for the upper second intermediate left drive roll 4A on the "left side", not for the "right side" like the upper second intermediate right drive roll 4C described below, but the exchange table for the "right side" is exactly the same as that shown in Figure 5 and the like, except that the vertical and left-right directions are reversed, so details thereof will be omitted.

[0062] Then, as shown in Figure 12, the Y-axis movable part 122 is driven to start inserting the drive roll exchange table 300 between the upper mill housing 25 and the lower mill housing 26 at a position vertically below the upper second intermediate drive right roll 4C and in the opposite rolling direction.

[0063] The axial insertion position at this time is set to a position where the rubber roller 316 and wheel 317 of the work-side roll holding unit 310 of the drive roll exchange table 300 hold the work-side neck 4C3 of the upper second intermediate right drive roll 4C from below, and the wheels 321, 322 of the drive-side roll holding unit 320 hold the drive-side neck 4C3 of the upper second intermediate right drive roll 4C from below, as shown in Figure 13.

[0064] Furthermore, as shown in FIG. 12 , the X-axis direction movable part 120 and the Z-axis direction movable part 124 are driven in a direction in which the entire upper second intermediate right driving roll 4C is supported by the driving roll exchange table 300, and the upper second intermediate right driving roll 4C is supported by the driving roll exchange table 300 as shown in FIG. 14 .

[0065] After it is confirmed that the upper second intermediate drive right roll 4C is held by the drive roll exchange table 300, as shown in Figure 15, the Y-axis direction movable part 122 is driven to extract the upper second intermediate drive right roll 4C together with the drive roll exchange table 300 from the upper mill housing 25. At this time, support of the bearing of the upper second intermediate drive right roll 4C by the upper second intermediate drive right roll holding arm 70C is released, and the rolling mill side coupling 52C2 connected to the drive part 50C for driving the upper second intermediate drive right roll 4C to rotate during rolling is released from the engagement of the coupling 4C2.

[0066] Furthermore, the upper second intermediate driving right roll holding arm 70C, which was provided at the tip of the upper second intermediate driving right roll holding cylinder 60C, is removed from the upper second intermediate driving right roll holding cylinder 60C, and the upper second intermediate driving right roll holding cylinder 60C is retracted.

[0067] Next, the lower second intermediate right drive roll 4D is removed so that the drive roll exchange table 300 can be used as is. The procedure is substantially the same as that for removing the upper second intermediate right drive roll 4C, so details will be omitted. The difference is that the upper second intermediate right drive roll 4C is accessed from diagonally below when supported on the drive roll exchange table 300, but the lower second intermediate right drive roll 4D is accessed from the horizontal direction.

[0068] Thereafter, the upper second left intermediate drive roll 4A and the lower second left intermediate drive roll 4F are removed in this order. The removal of the upper second left intermediate drive roll 4A and the lower second left intermediate drive roll 4F is the same as the removal of the upper second right intermediate drive roll 4C and the lower second right intermediate drive roll 4D, respectively, except that a drive roll exchange table 300 with an inverted left-right structure is used. Therefore, details thereof will be omitted.

[0069] Finally, the removal of the upper second intermediate roll 4B will be described with reference to Figures 16 to 18. Figure 16 shows the state when the upper second intermediate roll is removed by the roll changing device of the embodiment, and Figures 17 and 18 show the state inside the multi-stage rolling mill when the upper second intermediate roll is removed by the roll changing device of the embodiment.

[0070] When removing the upper second intermediate roll 4B, first, the drive roll exchange table 300 is removed from the exchange table gripping device 130, and the idle roll exchange table 400 is reattached.

[0071] 16, the Y-axis movable part 122 is driven to start inserting the idle roll exchange table 400 between the upper mill housing 25 and the lower mill housing 26 at a position vertically below the upper second intermediate roll 4B. The axial insertion position at this time is such that the roll bearing receiver 450 provided on the upper surface of the idle roll exchange table 400 is below the bearing of the upper second intermediate roll 4B, and the work side roll neck receiver 430 and the drive side roll neck receiver 432 are below the work side roll neck and drive side roll neck, respectively, of the upper second intermediate roll 4B.

[0072] Next, as shown in FIG. 17 , the Z-axis direction movable unit 124 is driven to raise the idle roll exchange table 400, creating a state in which the roll bearing receivers 450 hold the bearings of the upper second intermediate roll 4B, the work side roll neck receivers 430 hold the work side roll neck of the upper second intermediate roll 4B, and the drive side roll neck receivers 432 hold the drive side roll neck of the upper second intermediate roll 4B.

[0073] 18, the Y-axis movable part 122 is driven again to move the idle roll exchange table 400 horizontally in the removal direction. As a result, on the drive side of the upper second intermediate roll 4B, the upper second intermediate roll drive-side holding arm 70B1 moves away from the support member 60B1 on the upper mill housing 25 side, and on the work side, the upper second intermediate roll holding arm 70B moves away from the upper second intermediate roll holding cylinder 60B, and is completely supported by the idle roll exchange table 400, thereby being extracted. At this time, the upper second intermediate roll holding cylinder 60B is retracted.

[0074] As a result, as shown in FIG. 19, all of the second intermediate rolls are removed by the roll changing device of the embodiment.

[0075] Thereafter, the eight backup rolls 5 are removed in the following order, for example: second lower backup roll F and third lower backup roll G, first lower backup roll E and fourth lower backup roll H, (6) second upper backup roll B and third upper backup roll C, and first upper backup roll A and fourth upper backup roll D; however, the above order is an example and is not limited to this.

[0076] Next, the procedure for attaching the backup roll 5, the second intermediate roll 4, the first intermediate roll 3, and the work roll 2 will be described with reference to Figures 20 and 21. Since it is desirable to roughly follow the procedure in reverse to the above-described removal procedure, only the differences will be described below.

[0077] For the second intermediate roll 4, we will explain the case where the rolls are removed in the following order: (1) upper second intermediate roll 4B, (2) lower second intermediate drive left roll 4F, (3) upper second intermediate drive left roll 4A, (4) lower second intermediate drive right roll 4D, (5) upper second intermediate drive right roll 4C, and (6) lower second intermediate roll 4E, but this order is not limited to this.

[0078] The step in the installation procedure that is most different from the removal procedure is that when the upper second intermediate drive left roll 4A, the upper second intermediate drive right roll 4C, the lower second intermediate drive right roll 4D, and the lower second intermediate drive left roll 4F are inserted, a procedure is added to automatically control the replacement device to achieve engagement between the roll-side coupling 4C2 and the rolling mill-side coupling 52C2 (only the upper second intermediate drive right roll 4C is exemplified here) of the drive unit 50C of the multi-stage rolling mill 200, without any work by an operator.

[0079] FIG. 20 shows the state when the upper second intermediate drive left roll 4A is installed by the roll changing device of the embodiment, FIG. 22 shows the state inside the multi-stage rolling mill when the lower second intermediate drive right roll 4D is installed, and FIG. 21 shows an outline of how to align the circumferential position when the upper second intermediate drive roll is installed by the roll changing device of the embodiment.

[0080] As shown in Figure 20, first, the left-side drive roll exchange table 300 is attached to the exchange table gripping device 130, and the upper second intermediate drive left roll 4A to be replaced is placed on the left-side drive roll exchange table 300. The Y-axis direction movable part 122 is driven to insert the upper second intermediate drive left roll 4A, while it is placed on the drive roll exchange table 300, into a temporary insertion position in the multi-stage rolling mill 200, vertically below the upper second intermediate roll 4B (temporary insertion step).

[0081] Thereafter, the X-axis direction movable part 120 and the Z-axis direction movable part 124 are driven to temporarily move the upper second intermediate driving left roll 4A to the actual insertion position.

[0082] Thereafter, the second intermediate roll 4 is coupled to the roll drive device by controlling the circumferential position of the second intermediate roll 4. The coupling procedure will be described below with reference to FIG.

[0083] As shown in Figure 21, in a method for controlling the circumferential position of the second intermediate roll 4 when replacing the second intermediate roll 4 in a multi-stage rolling mill 200, the second intermediate roll 4 to be replaced is placed on the drive roll replacement table 300, the second intermediate roll 4 is rotated by the rubber roller 316, and the circumferential positions of the necks 4A3, 4C3, 4D3, and 4F3 are detected, thereby stopping the rubber roller 316 at a coupling position to the roll drive device of the drive unit 50C, which rotates and drives the second intermediate roll 4 during rolling.

[0084] For example, when the circumferential positions of the upper second left intermediate drive roll 4A, the upper second right intermediate drive roll 4C, the lower second right intermediate drive roll 4D, and the lower second left intermediate drive roll 4F reach the coupling position, the roll-side protrusions 4A4, 4C4, 4D4, and 4F4 are provided in advance on the necks 4A3, 4C3, 4D3, and 4F3 of the upper second left intermediate drive roll 4A, the upper second right intermediate drive roll 4C, the lower second right intermediate drive roll 4D, and the lower second left intermediate drive roll 4F at positions where the structures are detected by the proximity sensor 315, and the rubber roller 316 is rotated by the motor 311. The upper second intermediate drive left roll 4A, the upper second intermediate drive right roll 4C, the lower second intermediate drive right roll 4D, and the lower second intermediate drive left roll 4F are rotated by this, and when the proximity sensor 315 detects the roll side protrusions 4A4, 4C4, 4D4, and 4F4, the rotation of the rubber roller 316 by the motor 311, i.e., the rotation of the upper second intermediate drive left roll 4A, the upper second intermediate drive right roll 4C, the lower second intermediate drive right roll 4D, and the lower second intermediate drive left roll 4F, is stopped, thereby automatically aligning the circumferential position with the coupling position (coupling step).

[0085] Thereafter, the Y-axis movable part 122 is driven to move the upper second intermediate drive left roll 4A in the axial direction again for actual insertion, thereby automatically engaging the coupling on the upper second intermediate drive left roll 4A side with the coupling on the rolling mill side (actual insertion step). This realizes connection and disconnection of the coupling of the driven second intermediate roll 4 to the drive system of the multi-high rolling mill 200 without the intervention of an operator.

[0086] Thereafter, the upper second intermediate drive left roll holding cylinder 60A is extended, the upper second intermediate drive left roll holding arm 70A is attached to the tip of the upper second intermediate drive left roll holding cylinder 60A, and the upper second intermediate drive left roll holding arm 70A is also attached to the upper second intermediate drive left roll 4A, thereby fixing the upper second intermediate drive left roll 4A.

[0087] The upper second intermediate right drive roll 4C also has a drive roll exchange table 300 for the right side, and the flow is the same as that of the upper second intermediate left drive roll 4A except that the left and right are reversed.

[0088] In the case of the lower second intermediate right drive roll 4D shown in Figure 22, the right-side drive roll exchange table 300 is attached to the exchange table gripping device 130, and the lower second intermediate right drive roll 4D to be replaced is placed on the right-side drive roll exchange table 300.The Y-axis movable part 122 is driven to insert the lower second intermediate right drive roll 4D, while it is placed on the drive roll exchange table 300, into the central position in the rolling direction of the lower mill housing 26, which is the temporary insertion position within the multi-stage rolling mill 200 (temporary insertion step).

[0089] Furthermore, the Z-axis direction movable part 124 is driven to move it vertically downward, and then the X-axis direction movable part 120 is driven to temporarily move the lower second intermediate drive right roll 4D to the actual insertion position.

[0090] Next, the coupling of the lower second intermediate driving right roll 4D is engaged with the coupling of the roll driving device by controlling the circumferential position of the second intermediate roll 4 (coupling step).

[0091] Thereafter, the Y-axis movable part 122 is driven to move the lower second intermediate drive right roll 4D in the axial direction again for actual insertion, thereby automatically engaging the coupling on the lower second intermediate drive right roll 4D side with the rolling mill side coupling (actual insertion step).

[0092] The lower second intermediate left driving roll 4F also has a driving roll exchange table 300 for the left side, and the flow is the same as that of the lower second intermediate right driving roll 4D except that the left and right sides are reversed.

[0093] Next, the effects of this embodiment will be described.

[0094] The drive roll changing table 300 for the changing carriage 100 for changing the second intermediate rolls 4 of the multi-high rolling mill 200 of this embodiment described above can automatically and reliably hold the roll on the vertically upper side of the rolled material at both end portions on the drive side and the work side of the roll, so that the roll can be inserted and extracted more horizontally than before, and circumferential positioning of the drive coupling can also be performed automatically, making it easier to automate the roll removal and installation work. In other words, there are provided an exchange table for a roll changing device for a rolling mill, a roll changing device, a method for controlling the circumferential position of a roll when changing rolls in a rolling mill, and a method for inserting a roll into a rolling mill, which can perform roll changing work more safely and easily than before.

[0095] Furthermore, the proximity sensor 315 can detect the distance to the marks provided on the necks 4A3, 4C3, 4D3, and 4F3, thereby enabling highly accurate and reliable detection of the coupling position.

[0096] Furthermore, since the drive device has a motor 311 provided on the front side in the direction of insertion of the support beam 330 into the multi-stage rolling mill 200, the drive source for rotating the second intermediate roll 4 can be provided on the side with more space, and it can be rotated and driven to a position that reliably achieves coupling.

[0097] Furthermore, since the rubber roller 316 has rubber on its outer periphery, it can easily achieve a higher coefficient of friction than the wheels 317, etc., and can achieve a configuration that is extremely suitable for reliably rotating the roll neck of the second intermediate roll 4, which uses oil or the like for rotational drive, without slipping.

[0098] Furthermore, since the drive roll exchange table 300 is configured to be detachable from the exchange carriage 100, it is possible to prepare a plurality of exchange tables suitable for each second intermediate roll 4.

[0099] <Others> The present invention is not limited to the above-described embodiments, and various modifications and applications are possible. The above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those having all of the described configurations.

[0100] For example, the following aspects are provided as means for solving the same problems as those described above.

[0101] (1) The exchange table for a rolling mill roll changing device is an exchange table for a changing device for changing the rolls of a rolling mill, and is equipped with a support beam and two roll holding parts, the two roll holding parts being provided at the bottom of the support beam, and the back side of the two roll holding parts in the direction of insertion of the support beam into the rolling mill has recesses for engaging the protrusions of the bearing box.

[0102] With this structure, the roll can be automatically and reliably held on the vertically lower side of the rolled material at both ends of the drive side and the working side of the roll, and therefore the roll can be inserted and extracted more horizontally than before, making it easier to automate the roll removal and installation work. In other words, there are provided an exchange table for a roll changing device for a rolling mill, a roll changing device, a method for controlling the circumferential position of a roll when changing rolls in a rolling mill, and a method for inserting a roll into a rolling mill, which make it possible to perform roll changing work more safely and easily than before.

[0103] (2) The changing table for a roll changing device of a rolling mill according to (1), further comprising a support part provided on an upper part of the support beam and supporting at least one of the roll body, the drive-side roll neck and the work-side roll neck. With such a structure, it is possible to easily realize, using the same jig, automation of not only holding the roll on the lower side in the vertical direction of the rolled material, but also holding the roll on the upper side in the vertical direction of the rolled material.

[0104] (3) A roll changing device equipped with the exchange table for a rolling mill roll changing device according to (1) or (2).

[0105] (4) In the roll changing device described in (3), the rolling mill roll changing device exchange table is configured to be detachable from the roll changing device.

[0106] DESCRIPTION OF SYMBOLS 1...Strip 2...Work roll 2A...Upper work roll 2B...Lower work roll 3...First intermediate roll 3A, 3B...Upper first intermediate roll 3C, 3D...Lower first intermediate roll 4...Second intermediate roll 4A...Upper second intermediate drive left roll 4A2, 4C2, 4D2, 4F2...Coupling 4A3, 4C3, 4D3, 4F3...Neck 4A4, 4C4, 4D4, 4F4...Roll side projection (mark) 4B...Upper second intermediate roll 4C...Upper second intermediate drive right roll 4D...Lower second intermediate drive right roll 4E...Lower second intermediate roll 4E1, 4E2...Bearing projection 4F...Lower second intermediate drive left roll 5...Backup roll 7...Tile 9...Coolant spray header 23...Tile clamp 25...Upper mill housing 26...Lower mill housing 50C...Drive unit (roll drive device) 52C2...Rolling mill side coupling 60A...Second intermediate drive left roll holding cylinder 60B...Second intermediate roll holding cylinder 60B1...Support member 60C...Second intermediate drive right roll holding cylinder 70A...Second intermediate drive left roll holding arm 70B...Second intermediate roll holding arm 70B1...Second intermediate roll drive side holding arm 70C...Second intermediate drive right roll holding arm 100...Exchange carriage (roll changing device) 110...Carriage 112...Wheel 120...X-axis direction movable part 122...Y-axis direction movable part 124...Z-axis direction movable part 130...Exchange table gripping device 200...Multi-stage rolling mill (rolling mill) 300...Drive roll exchange table (exchange table for rolling mill roll changing device) 310...Work side roll holding part 311...Motor (drive device) 313...Pulley (drive device) 314... Belt (driving device) 315... Proximity sensor (sensor) 316... Rubber roller (driving wheel) 317, 321, 322... Wheel 318... Rotating shaft (driving device) 320... Driving side roll holding part 330... Support beam 350... Clamp part 400... Idle roll exchange table (exchange table for rolling mill roll changing device) 420,422...bearing protrusion receiving portion 430...working side roll neck receiving portion 432...driving side roll neck receiving portion 440...roll body receiving portion 450...roll bearing receiving portion 460...clamp portion A...first upper backup roll B...second upper backup roll C...third upper backup roll D...fourth upper backup roll E...first lower backup roll F...second lower backup roll G...third lower backup roll H...fourth lower backup roll,

Claims

1. An exchange table for a roll-changing device for changing rolls of a rolling mill, comprising: two roll holders that hold the necks of the respective rolls from below and each have at least two wheels; and a support beam connected to the two roll holders. The drive wheels, which are the wheels provided in the roll holder on the front side in the insertion direction of the support beam into the rolling mill, are made of a material having a higher coefficient of friction than the other wheels. The exchange table for a roll-changing device of a rolling mill further comprises a sensor for detecting the circumferential position of the neck and a drive device that applies a rotational driving force to the drive wheels and controls the rotational driving of the drive wheels based on a signal detected by the sensor.

2. The exchange table for a roll-changing device of a rolling mill according to claim 1, wherein the sensor detects the distance from a mark provided on the neck.

3. The exchange table for a roll-changing device of a rolling mill according to claim 1, wherein the drive device has a motor provided on the front side in the insertion direction of the support beam into the rolling mill.

4. The exchange table for a roll-changing device of a rolling mill according to claim 1, wherein the drive wheels are provided with rubber on the outer periphery.

5. A roll-changing device comprising the exchange table for a roll-changing device of a rolling mill according to any one of claims 1 to 4.

6. The roll-changing device according to claim 5, wherein the exchange table for a roll-changing device of a rolling mill is configured to be detachable from the roll-changing device.

7. A method for controlling the circumferential position of a roll during roll exchange of a rolling mill, comprising: placing the roll to be exchanged on an exchange table for a roll-changing device of a rolling mill, the exchange table comprising two roll holders that hold the necks of the respective rolls from below and each have at least two wheels, and a support beam connected to the two roll holders; rotating the roll by drive wheels, which are made of a material having a higher coefficient of friction than the other wheels and are provided in the roll holder on the front side in the insertion direction of the support beam into the rolling mill, to detect the circumferential position of the neck, and stopping the drive wheels at the coupling position to a roll drive device that rotationally drives the roll during rolling.

8. A temporary insertion step of inserting a roll to be exchanged into a temporary insertion position in the rolling mill, a coupling step of coupling the roll to the roll drive device by the method for controlling the circumferential position of the roll according to claim 7, and a main insertion step of further inserting the roll after the coupling. A method for inserting a roll into a rolling mill, comprising these steps.

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