Hook hanger for lifting rolling mill roll, and rolling mill

Abstract

A hook hanger 70 for holding upper first intermediate rolls 3A, 3B built into a cluster rolling mill 200 is attached to the tips of first intermediate roll–holding air cylinders 65A, 65B provided on the work side of the cluster rolling mill 200, and has a holder-receiving part 76 for receiving a hook 82 of a bearing holder 80 provided on the work side of the upper first intermediate rolls 3A, 3B. A hook-receiving surface 76A of the holder-receiving part 76, which is in contact with the hook 82, appears as a straight line when viewed from the insertion direction of the hook 82.

Description

Rolling mill roll lifting hook hanger and rolling mill

[0001] The present invention relates to a rolling mill roll lifting hook hanger and 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 spacing is narrow. Moreover, changing heavy rolls such as second intermediate rolls and backup rolls is particularly dangerous.

[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 conventional roll reassembly work, including the above-mentioned prior art, when the roll is attached to the rolling mill, the attachment work is completed only after confirming that the roll inserted into the housing of the rolling mill is properly coupled to the drive system.

[0007] However, because the roll to be replaced is very heavy, the operator must work with extreme caution. In particular, the upper roll must be held to prevent it from falling, and a device must be attached to the operator's side to lift the target roll. It was therefore desirable to reduce this labor.

[0008] The present invention provides a rolling mill roll lifting hook hanger and a rolling mill that make it possible to replace rolls in a cluster-type rolling mill more easily than before.

[0009] The present invention includes a plurality of means for solving the above-mentioned problems, and one example thereof is a hook hanger for holding rolls to be installed in a 12-high or 20-high rolling mill, wherein the hook hanger for lifting rolling mill rolls (hereinafter referred to as the roll hook hanger) is attached to the tip of a support member provided on the working side of the rolling mill, and has a holder receiver that receives the hook of an intermediate roll bearing holder provided on the working side of the roll, and when the hook receiving surface of the holder receiver that comes into contact with the hook is viewed from the insertion direction of the hook, the hook receiving surface is linear.

[0010] According to the present invention, roll replacement work for a cluster-type rolling mill can be performed more easily than in the past. Objects, configurations, and effects other than those described above will become apparent from the following description of the embodiments.

[0011] 11 is a front view showing an overview of a cluster-type rolling mill equipped with an intermediate roll bearing holder of an embodiment. FIG. 11 is a view showing an overview of an exchange carriage for performing roll changing work in the cluster-type rolling mill of an embodiment. FIG. 12 is a view showing an example of the positional relationship of rolls related to the intermediate roll bearing holder in the cluster-type rolling mill of an embodiment. FIG. 13 is a view showing an overview of the intermediate roll bearing holder of an embodiment. FIG. 14 is a view showing an overview of the intermediate roll bearing holder of an embodiment. FIG. 15 is a view showing an overview of the rolling mill roll hook holder of an embodiment. FIG. 16 is a view showing an overview of the rolling mill roll hook holder of an embodiment. FIG. 17 is a view showing the relationship between the rolling mill roll hook holder and the intermediate roll bearing holder of an embodiment. FIG. 18 is a view showing the relationship between the rolling mill roll hook holder and the intermediate roll bearing holder of an embodiment. FIG. 19 is a top view showing an overview of the coupling of a first intermediate roll in the cluster-type rolling mill of an embodiment. A cross-sectional view taken along A-A' in FIG. 11. FIG. 19 is a view showing the state when the first intermediate roll is removed in the cluster-type rolling mill of an embodiment. A diagram showing a state when a first intermediate roll is removed from a cluster-type rolling mill of an embodiment. A diagram showing a state when a first intermediate roll is attached to a cluster-type rolling mill of an embodiment. A diagram showing a state when a first intermediate roll is attached to a cluster-type rolling mill of an embodiment. A diagram showing a state when a first intermediate roll is attached to a cluster-type rolling mill of an embodiment. A diagram showing a state when a first intermediate roll is attached to a cluster-type rolling mill of an embodiment.

[0012] An embodiment of the rolling mill roll hook and rolling mill of the present invention will be described with reference to FIGS. 1 to 18.

[0013] 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.

[0014] First, the overall configuration of a cluster-type rolling mill 200 that is the subject of the embodiment will be described with reference to Fig. 1. Fig. 1 shows an outline of the cluster-type rolling mill 200 that is the subject of the embodiment.

[0015] 1, the cluster-type rolling mill 200 of this embodiment is a 20-high cluster-type 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. The cluster-type rolling mill 200 is not limited to 20 highs, and may have 12 highs.

[0016] In FIG. 1 , the cluster-type 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, a coolant spray header 9, and the like.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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 divided into upper and lower parts, and may be a monoblock housing.

[0023] Furthermore, in the cluster type rolling mill 200 of this embodiment, an exchange carriage 500 as shown in FIG. 2 is provided on the working side of the upper mill housing 25 and the lower mill housing 26.

[0024] Next, the overall configuration of the exchange carriage 500 will be described with reference to Fig. 2. Fig. 2 shows an outline of the exchange carriage that performs roll exchange work in the cluster type rolling mill of the embodiment.

[0025] The replacement cart 500 shown in Figure 2 is a work vehicle for automatically or semi-automatically performing replacement work on the upper first intermediate rolls 3A, 3B and the lower first intermediate rolls 3C, 3D, and is equipped with a replacement work arm 540, a mounting table 502 for placing the replacement first intermediate roll 3E and the replaced first intermediate roll 3F, a support 504 for arranging multiple mounting tables 502 in the vertical direction, and wheels 512 that are provided on the lower end surface of the support 504 and are used when moving toward or away from the upper mill housing 25 and the lower mill housing 26.

[0026] The exchange carriage 500 has a plurality of wheels 512 on its bottom surface, and these wheels 512 run on rails arranged on the ground of the factory where the cluster-type rolling mill 200 is installed, so that the exchange carriage 500 can run in the axial direction of the first intermediate roll 3 provided on the cluster-type rolling mill 200.

[0027] For example, when replacing the upper first intermediate rolls 3A, 3B, the replacement work arm 540 is brought close to the upper mill housing 25 and the lower mill housing 26, grasps the first intermediate roll 3 to be removed, and pulls it out from the upper mill housing 25 and the lower mill housing 26, and installs a new first intermediate roll 3 into the upper mill housing 25 and the lower mill housing 26.A clamping device (omitted for convenience of illustration) is provided at the tip of the drive side that is inserted into the cluster type rolling mill 200.

[0028] The clamp device 530 includes a lower clamp 531 that pushes up the lower surfaces 85B, 86B of one of the stoppers 85, 86 of the bearing holder 80, thereby applying a force to one of the stoppers 85 to rotate the axis 90A of the hook arm 83, and an upper clamp 532 that is driven by an upper clamp drive arm 534 and presses the two stoppers 85, 86 against the lower clamp 531 to stop the rotational movement of the hook arm 83.

[0029] Figure 3 shows an example of the positional relationship between the intermediate roll bearing holder and the associated rolls in the cluster-type rolling mill of the embodiment. The left half of Figure 3 shows a state in which the upper first intermediate roll 3A has a large roll diameter, while the right half shows a state in which the upper first intermediate roll 3B has a small roll diameter. In the following explanation, only the state in which the upper first intermediate roll 3A has a large roll diameter will be illustrated, but details are substantially the same for other diameters, and therefore will be omitted.

[0030] 3, the upper first intermediate roll 3A, which is supported in contact with the upper second intermediate drive left roll 4A and the upper second intermediate roll 4B, is held in a state in which a bearing holder 80 provided on the work side thereof is inserted into a hook holder 70 attached to the tip of the upper first intermediate roll holding air cylinder 65A. Similarly, the upper first intermediate roll 3B, which is supported in contact with the upper second intermediate roll 4B and the upper second intermediate drive right roll 4C, is held in a state in which a bearing holder 80 provided on the work side thereof is inserted into a hook holder 70 attached to the tip of the upper first intermediate roll holding air cylinder 65B.

[0031] The first intermediate roll holding air cylinders 65A, 65B are pneumatic cylinders whose upper ends are attached to the outer side surface of the upper mill housing 25 or to a structure further above it. A hook holder 70 is detachably provided at the tip of each cylinder.

[0032] In this embodiment, the cluster-type rolling mill 200 is equipped with bearing holders 80 attached to the upper first intermediate roll bearings 3A2, 3B2 (see Figure 11, etc.) on the working side of the upper first intermediate rolls 3A, 3B, and hook hangers 70 at the tips of the first intermediate roll holding air cylinders 65A, 65B.

[0033] As shown in FIG. 3, the take-out position from within the cluster-type rolling mill 200 and the mounting position change depending on the diameter of the upper first intermediate rolls 3A and 3B.

[0034] Figures 4 and 5 show an outline of an intermediate roll bearing holder according to an embodiment. Figures 6 and 7 show an outline of a rolling mill roll hook holder according to an embodiment. Figures 8 to 10 show the relationship between the rolling mill roll hook holder and the intermediate roll bearing holder according to an embodiment.

[0035] As shown in FIGS. 4 and 5, in this embodiment, the bearing holder 80 includes a clamp portion 84, a hook arm 83 having a hook 82, two stoppers 85 and 86, and the like.

[0036] This bearing holder 80 is attached to the roll neck portion to prevent the upper first intermediate rolls 3A, 3B from falling, and brings the upper first intermediate rolls 3A, 3B into contact with the rolls on the back surface that counteract the rolling load. The bearing holder 80 is connected to a device that has the function of applying a load in the direction that brings the upper first intermediate rolls 3A, 3B into contact, thereby bringing the rolls into contact with each other. In addition, the bearing holder 80 is fixed to the upper mill housing 25 so as not to hinder the movement of the upper first intermediate rolls 3A, 3B in the synchronous direction during rolling.

[0037] The clamp portion 84 is a substantially ring-shaped member having, at its center, a shaft holding hole 87, which is a hole with a cylindrical inner circumferential surface for gripping the shafts 3A3, 3B3 of the upper first intermediate rolls 3A, 3B.

[0038] The hook arm 83 extends radially outward from the outer peripheral end of the clamp portion 84, and has at its tip a hook 82 that is inserted into the holder receiving portion 76 of the hook hanger 70 attached to the tip of the first intermediate roll holding air cylinder 65A, 65B on the cluster type rolling mill 200 side.

[0039] The holder receiving surface 82A of the hook 82 that comes into contact with the holder receiving portion 76 is chamfered, and the presence of the hook portion protrusion 82B ensures that the holder receiving surface 82A makes surface contact with the hook receiving surface 76A of the holder receiving portion 76.

[0040] The two stoppers 85, 86 are provided on the outside (work side) of the clamping section 84 in the direction of the axes 3A3, 3B3, which clamp the upper first intermediate rolls 3A, 3B, and are provided on either side of the hook arm 83 when the clamping section 84 is viewed from the circumferential direction.

[0041] The two stoppers 85, 86 have their upper surfaces 85A, 86A provided on the same plane 90C. In addition, the bearing holder 80 is configured so that the axis 90A of the hook arm 83, which passes through the rotation center of the clamp portion 84, is inclined with respect to a perpendicular line 90B to the plane 90C. For example, it is desirable that the angle θ1 between the axis 90A and the perpendicular line 90B be equal to or greater than 9° and equal to or less than 16°. The reason for this will be described later.

[0042] It is also desirable that the lower surfaces 85B and 86B of the two stoppers 85 and 86 are provided on different planes 90D and 90E. That is, it is desirable that the plane 90D passing through the lower surface 85B of the stopper 85 and the plane 90E passing through the lower surface 86B of the stopper 86 intersect with each other.

[0043] Furthermore, it is desirable that the straight lines extending from the upper surfaces 85A, 86A and the lower surfaces 85B, 86B of the two stoppers 85, 86 intersect with each other. That is, it is desirable that a plane 90C passing through the upper surfaces 85A, 86A of the stoppers 85, 86 intersects with a plane 90D passing through the lower surface 85B of the stopper 85, and that the plane 90C intersects with a plane 90E passing through the lower surface 86B of the stopper 86.

[0044] These stoppers 85, 86 are each a part of the clamp portion 84 cut out in the circumferential direction, and stopper 86 has the role of stopping the clockwise rotation of the upper first intermediate rolls 3A, 3B, while stopper 85 has the role of stopping the counterclockwise rotation of the upper first intermediate rolls 3A, 3B.

[0045] Specifically, in the cluster-type rolling mill 200, in order to automatically replace the upper first intermediate rolls 3A, 3B, the hook arm 83 of the bearing holder 80, which is provided on the working side of the upper first intermediate rolls 3A, 3B, needs to be set at a predetermined angle in order to join the bearing holder 80 to the first intermediate roll holding air cylinders 65A, 65B.

[0046] Therefore, by allowing the hook arm 83 of the bearing holder 80 to rotate freely while limiting the rotation within a predetermined range using stoppers 85 and 86, the bearing holder 80 is maintained tilted at an appropriate angle so that it can pass between the upper second intermediate drive left roll 4A and the upper second intermediate roll 4B, and between the upper second intermediate roll 4B and the upper second intermediate drive right roll 4C, making it possible to replace the upper first intermediate rolls 3A and 3B even while the bearing holder 80 is still attached to the upper first intermediate rolls 3A and 3B.

[0047] That is, the stoppers 85, 86 come into contact with the lower clamps 531 of the clamping mechanism, thereby restricting the rotation of the hook arms 83 of the bearing holder 80. When the upper first intermediate rolls 3A, 3B are attached or detached, the claws of the upper clamps 533 press the stoppers 85, 86 from above to sandwich the bearing holder 80 and fix the angle of the hook arms 83. Furthermore, when the upper first intermediate rolls 3A, 3B are inserted or removed from the mounting table 502, the stoppers 85, 86 come into contact with the lower clamps 531 that clamp the upper first intermediate rolls 3A, 3B, thereby changing the angle of the hook arms 83.

[0048] For this purpose, a clamp device 530 that clamps stoppers 85, 86 located at the ends of the upper first intermediate rolls 3A, 3B from above and below is provided on the tip side of the replacement work arm 540 of the replacement carriage 500.

[0049] Furthermore, it is desirable that the circumferential length of the clamping portion 84 of the two stoppers 85, 86 is within a range such that when the substantially V-shaped lower clamp 531 that grips the bearing holder 80 grips the bearing holder 80, the outer circumferential surfaces 85C, 86C of the stoppers 85, 86 do not come into contact with the lower clamp 531 and do not come into contact with the shafts 3A3, 3B3. The reason for this is as follows.

[0050] With regard to the lengths of the stoppers 85, 86, by setting the length of the stopper 85 that hits the lower clamp 531 first within the above-mentioned range, it is possible to minimize the possibility that the lower clamp 531 will hit the outer peripheral surface 85C of the stopper 85 instead of the lower surface 85B thereof, causing the stopper 85 to be pinched between the lower clamp 531 and the shafts 3A3, 3B3 of the upper first intermediate rolls 3A, 3B, making it difficult to rotate the hook arm 83, although this will depend on the inclination of the hook arm 83. In addition, it is possible to minimize the possibility that the lower clamp 531 will hit the shafts 3A3, 3B3 before hitting the stopper 85, making it difficult to rotate the hook arm 83.

[0051] The hook holder 70 of this embodiment shown in Figures 6 and 7 is a member that holds the upper first intermediate rolls 3A, 3B that are incorporated into a 20-high cluster-type rolling mill 200, and is attached to the tips of the first intermediate roll holding air cylinders 65A, 65B that are provided on the working side of the cluster-type rolling mill 200.

[0052] As shown in FIGS. 6 and 7, the hook holder 70 has a cylinder receiver 72, a connecting shaft 74, and a holder receiver 76.

[0053] The cylinder receiver 72 is a member for fixing the holder receiver 76, and the connecting shaft 74 is a member for attaching the hook holder 70 to the tip of the first intermediate roll holding air cylinder 65A, 65B.

[0054] 7 to 10, the holder receiving portion 76 is a member that receives the hooks 82 of the bearing holder 80 provided on the working side of the upper first intermediate rolls 3A, 3B, and the hook receiving surface 76A that comes into contact with the hooks 82 is linear when viewed from the inserting direction of the hooks 82. Moreover, as shown in Fig. 6, it is desirable that the hook receiving surface 76A be linear when viewed from a direction perpendicular to the inserting direction of the hooks 82.

[0055] When replacing the upper first intermediate rolls 3A, 3B, when the bearing holder 80 is raised or lowered while hanging on the hook hanger 70, it is necessary that the hook hanger 70 does not firmly fix the bearing holder 80 so that the hook 82 of the bearing holder 80 can move laterally in response to the rotation of the hook arm 83 of the bearing holder 80.

[0056] This is because, when replacing the upper first intermediate rolls 3A, 3B, it is necessary to tilt the hook arms 83 of the bearing holder 80 at a predetermined angle in order to connect the bearing holder 80 to the first intermediate roll holding air cylinders 65A, 65B (see FIGS. 13 to 18 ). However, although the hook arms 83 of the bearing holder 80 rotate freely, they are limited to rotation within a predetermined angle range by stoppers 85, 86. This allows the bearing holder 80 to be maintained in a tilted state at an appropriate angle so that it can pass between the upper second intermediate left drive roll 4A and the upper second intermediate roll 4B, or between the upper second intermediate roll 4B and the upper second intermediate right drive roll 4C. This makes it possible to replace the upper first intermediate rolls 3A, 3B even with the bearing holder 80 attached to the upper first intermediate rolls 3A, 3B.

[0057] Therefore, the hook receiving surface 76A of the hook holder 70 where the hook 82 of the bearing holder 80 comes into contact is required to be linear as described above, rather than curved or pentagonal in shape with extreme points, and the length of the hook receiving surface 76A when viewed from the same direction as the axial direction of the upper first intermediate rolls 3A, 3B, as shown in Fig. 6, is desirably sufficiently longer than the width of the hooks 82. Furthermore, when viewed from a direction perpendicular to the axial direction of the upper first intermediate rolls 3A, 3B, the hook receiving surface 76A is desirably not chamfered but is a flat surface.

[0058] Next, the process of removing the first intermediate roll 3 from the cluster-type rolling mill 200 and the process of attaching the first intermediate roll 3 will be described.

[0059] Regarding the removal of rolls other than the first intermediate roll 3, the work roll 2 is removed prior to the removal of the first intermediate roll 3, and the coolant spray header 9, second intermediate roll 4, and backup roll 5 are removed in the listed order after the removal of the first intermediate roll 3, but further details are not particularly limited.

[0060] Regarding the installation, the backup roll 5, the second intermediate roll 4, and the coolant spray header 9 are installed in the listed order prior to the installation of the first intermediate roll 3, and the work roll 2 is installed after the installation of the first intermediate roll 3, but further details are not particularly limited.

[0061] First, the reason why the hook arms 83 of the bearing holder 80 are inclined and the vertical position of the insertion position when the upper first intermediate rolls 3A, 3B are attached is lower than the vertical position of the removal position when they are removed, as shown in Fig. 3, will be explained with reference to Fig. 11 and Fig. 12. Fig. 11 is a top view showing an outline of the coupling of the first intermediate roll of the cluster-type rolling mill of the embodiment, and Fig. 12 is a side view showing an outline of the coupling of the first intermediate roll as viewed from the axial direction.

[0062] As shown in Figure 3, when the cluster-type rolling mill 200 is viewed from the side in the rolling direction, in order to reduce interference with the upper second intermediate drive left roll 4A, the upper second intermediate roll 4B, and the upper second intermediate drive right roll 4C, it is desirable that the first intermediate roll holding air cylinders 65A, 65B and the bearing holder 80 pass between the upper second intermediate drive left roll 4A and the upper second intermediate roll 4B and between the upper second intermediate roll 4B and the upper second intermediate drive right roll 4C.

[0063] Furthermore, as shown in Figures 11 and 12, in order to prevent the upper first intermediate rolls 3A, 3B from moving in the axial direction during rolling, the couplings 3A1, 3B1 of the upper first intermediate rolls 3A, 3B are fitted horizontally into approximately C-shaped couplings 30A1, 30B1 on the drive section 30A, 30B side.

[0064] In order to horizontally engage or disengage the couplings 3A1, 3B1 with the couplings 30A1, 30B1, it is necessary to move the upper first intermediate rolls 3A, 3B horizontally to some extent. If the first intermediate roll holding air cylinders 65A, 65B and the bearing holder 80 were to be provided in a straight line with respect to the vertical direction in order to achieve this horizontal movement, a new mechanism would be required to move these mechanisms horizontally, but this would complicate the structure and should be avoided if possible.

[0065] Due to these circumstances, it is necessary to make the vertical insertion position of the upper first intermediate rolls 3A and 3B lower, especially since space is required for fitting of the couplings 3A1, 3B1, 30A1, and 30B1 during insertion.

[0066] Next, the manner in which the upper first intermediate rolls 3A, 3B are removed will be described with reference to Figures 13 and 14. Figures 13 and 14 show the manner in which the first intermediate rolls are removed in the cluster-type rolling mill of the embodiment. In the following description, the upper first intermediate roll 3A will be exemplified, but the procedure for removing the upper first intermediate roll 3B is the same, so a description thereof will be omitted.

[0067] In the first stage of removing the upper first intermediate roll 3A, the lower surface 85B of the stopper 85 is held by the lower clamp 531 of the exchange carriage 500, as shown in FIG.

[0068] 14, the upper first intermediate roll holding air cylinder 65A is extended to move the hook holder 70 obliquely downward in the vertical direction. This releases the hook receiving surface 76A of the hook holder 70 from the holder receiving surface 82A of the hook 82 of the bearing holder 80. As a result, the inclination angle θ2 of the axis 90A of the hook arm 83 of the bearing holder 80 with respect to the vertical direction becomes larger than the inclination angle θ1 of the axis 90A of the hook arm 83 with respect to the vertical direction when the upper first intermediate roll 3A is positioned in the cluster-type rolling mill 200, and this creates room for horizontal movement to release the engagement of the couplings 3A1, 3B1, 30A1, and 30B1, making it possible to release the engagement of the couplings 3A1, 3B1, 30A1, and 30B1.

[0069] In the state shown in FIG. 14, the replacement arm 540 is driven backward to remove the upper first intermediate roll 3A from the cluster-type rolling mill 200.

[0070] The replaced first intermediate roll 3F is moved to a roll shop or the like along with the replacement carriage 500, and after appropriate maintenance, etc., it is reused as a replacement first intermediate roll 3E, or if it is severely worn, it is discarded.

[0071] Next, the state of inserting the upper first intermediate roll 3A will be described with reference to Figures 15 to 18. Figures 15 to 18 show the state of installing the first intermediate roll in the cluster type rolling mill of the embodiment.

[0072] 15, the stopper 86 of the bearing holder 80 is fixed to the vertically lower side by the upper clamp 533, and the upper first intermediate roll 3A is moved axially by driving the replacement arm 540 while the rotational movement is restricted. At this time, as shown in FIGS. 3 and 15, the upper first intermediate roll 3A is inserted into the cluster-type rolling mill 200 at a position vertically lower than the vertical position at the time of removal, away from the upper second intermediate drive left roll 4A and the upper second intermediate roll 4B.

[0073] At this time, the upper first intermediate roll holding air cylinder 65A is extended further than the extended state at the time of removal, and the holder receiving portion 76 of the hook hanger 70 located at its tip is positioned so that it can accept the hook 82 of the bearing holder 80.

[0074] As a result, the hook 82 of the bearing holder 80 is inserted into the holder receiving portion 76 of the hook holder 70, and the hook receiving surface 76A of the hook holder 70 comes into contact with the holder receiving surface 82A of the hook 82 of the bearing holder 80, lightly restricting the rotational movement of the upper first intermediate roll 3A.

[0075] Thereafter, the upper clamp 533 is removed as shown in FIG. 16, and the upper first intermediate roll holding air cylinder 65A is retracted as shown in FIG. 17, and the replacement work arm 540 is driven to lift the upper first intermediate roll 3A together with the bearing holder 80.

[0076] When the upper first intermediate roll 3A reaches the same height as the actual vertical position of the upper first intermediate roll 3A within the cluster-type rolling mill 200, the upper first intermediate roll holding air cylinder 65A is further retracted, thereby lifting the holder receiving surface 82A of the hook 82 of the bearing holder 80 by the hook receiving surface 76A of the hook hanger 70.

[0077] As a result, the upper first intermediate rolls 3A, 3B move horizontally, and on the drive side, the couplings 3A1, 3B1 are fitted into the approximately C-shaped couplings 30A1, 30B1 on the drive unit 30A, 30B side, and on the work side, the bearing holder 80 is pulled vertically upward by the upper first intermediate roll holding air cylinder 65A via the hook hook 70 and becomes fixed, thereby completing the insertion operation.

[0078] At this time, the angle of inclination of the axis 90A of the hook arm 83 with respect to the vertical direction is angle θ1.

[0079] Next, the effects of this embodiment will be described.

[0080] The hook holders 70 that hold the upper first intermediate rolls 3A, 3B incorporated in the cluster-type rolling mill 200 of this embodiment described above are attached to the tips of the first intermediate roll holding air cylinders 65A, 65B provided on the working side of the cluster-type rolling mill 200, and have holder receiving portions 76 that receive the hooks 82 of the bearing holders 80 provided on the working side of the upper first intermediate rolls 3A, 3B, and when the hook receiving surface 76A that comes into contact with the hooks 82 of the holder receiving portions 76 is viewed from the insertion direction of the hooks 82, the hook receiving surface 76A is linear.

[0081] By providing such a hook holder 70, when replacing the upper first intermediate rolls 3A, 3B, it is possible to maintain a position and rotation angle suitable for removal, and when inserting, it is possible to achieve a position and angle suitable for insertion without requiring a special drive system for rotational or vertical movement.This means that the amount of operator intervention in the replacement work can be reduced compared to the conventional method, and the operator's labor is reduced compared to the conventional method, i.e., the roll replacement work can be performed more easily than before.

[0082] Furthermore, when the hook receiving surface 76A is viewed from a direction perpendicular to the insertion direction of the hook 82, the hook receiving surface 76A is linear, which makes it less likely that the hook 82 of the bearing holder 80 will move axially of the upper first intermediate rolls 3A, 3B relative to the hook hangers 70 of the first intermediate roll holding air cylinders 65A, 65B, thereby further improving the axial fixation of the upper first intermediate rolls 3A, 3B and contributing to more stable rolling.

[0083] <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.

[0084] DESCRIPTION OF SYMBOLS 1...Strip (metal strip) 2...Work roll 2A...Upper work roll 2B...Lower work roll 3...First intermediate roll 3A, 3B...Upper first intermediate roll (roll) 3A1, 3B1...Coupling 3A2, 3B2...Bearing 3A3, 3B3...Shaft 3C, 3D...Lower first intermediate roll 3E...Replacement first intermediate roll 3F...Replaced first intermediate roll 4...Second intermediate roll 4A...Second intermediate drive left roll 4B...Second intermediate roll 4C...Second intermediate drive right roll 4D...Second intermediate drive right roll 4E...Second intermediate roll 4F...Second intermediate drive left roll 5...Backup roll 7...Roof tile 9...Coolant spray header 23...Roof tile clamp 25...Upper mill housing 26...Lower mill housing 30A, 30B...Drive unit 30A1, 30B1...Coupling DESCRIPTION OF SYMBOLS 65A, 65B...First intermediate roll holding air cylinder (support member) 70...Hook hook (rolling mill roll hook) 72...Cylinder receiver 74...Connecting shaft 76...Holder receiver portion (holder receiver) 76A...Hook receiving surface 80...Bearing holder 82...Hook 82A...Holder receiving surface 82B...Hook portion protrusion 83...Hook arm 84...Clamp portion 85, 86...Stopper 85A, 86A...Upper surface 85B, 86B...Lower surface 85C, 86C...Outer circumferential surface 87...Shaft holding hole 90A...Axis of hook arm 83 passing through the center of rotation of lower clamp 531 90B...Perpendicular to plane 90C 90C...Plane passing through upper surfaces 85A, 86B of stoppers 85, 86 90D...Plane passing through lower surface 85B of stopper 85 90E...Plane passing through the lower surface 86B of the stopper 86 200...Cluster type rolling mill 500...Exchange carriage 502...Placement table 504...Support 512...Wheels 530...Clamping device 531...Lower clamp (lower clamp) 532...Upper clamp (upper clamp) 534...Upper clamp drive arm 540...Exchange work arm 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 θ1, θ2, θ3, θ4...Angles

Claims

1. A hook hanger for holding a roll incorporated in a 12-stand or 20-stand rolling mill, wherein the hook hanger is attached to the tip of a support member provided on the working side of the rolling mill, and has a holder receiver for receiving a hook of an intermediate roll bearing holder provided on the working side of the roll, and when viewing the hook receiving surface that contacts the hook of the holder receiver from the insertion direction of the hook, the hook receiving surface is linear. A hook hanger for a rolling mill roll.

2. The hook hanger for a rolling mill roll according to claim 1, wherein when viewing the hook receiving surface from a direction perpendicular to the insertion direction of the hook, the hook receiving surface is linear. A hook hanger for a rolling mill roll.

3. A rolling mill equipped with the hook hanger for a rolling mill roll according to claim 1 or 2.

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