Rolling mill, tandem rolling mill, and coolant supply mechanism for rolling mill

Abstract

This coolant supply mechanism for injecting coolant into a work roll 2 includes: a plurality of injection nozzles 8 that inject coolant and are provided in a row in the plate width direction of a band plate 1; holes 9 for supplying coolant to the respective injection nozzles 8; headers 12 for housing the plurality of injection nozzles 8; tubes 11 selectively blocking or leaving open the holes 9 inside the headers 12; and hydraulic cylinders 18 that move the tubes 11 to adjust the coolant injection amount of each of the plurality of provided injection nozzles 8. Through the foregoing configuration, provided are: a rolling mill comprising a coolant spray that can selectively inject coolant and can be applied to a rolling mill that has little space in which small-diameter work rolls are used; a tandem rolling mill; and a coolant supply mechanism for a rolling mill.

Description

[Technical field]

[0001] The present invention relates to a rolling mill, a tandem rolling mill, and a coolant supply mechanism for a rolling mill that are suitable for obtaining strip plate of high product quality, such as high plate shape accuracy, in rolling soft materials such as ordinary steel plate and aluminum alloy, and particularly hard materials such as stainless steel plate and copper alloy. [Background technology]

[0002] As an example of a strip flatness control device in cold rolling that can effectively correct flatness defects even when the flatness deviation exceeds a threshold value over the entire width direction of the strip, Patent Document 1 describes the following: a first coolant injection determination means that detects the worst flatness location of the strip based on the deviation between the flatness detection value obtained by the flatness detector and the flatness target value and creates a first coolant injection command for this worst flatness location; a second coolant injection determination means that detects a local flatness defect location of the strip based on the flatness deviation and creates a second coolant injection command for this local flatness defect location; a third coolant injection determination means that creates an opening / closing command for each coolant nozzle header based on the first coolant injection command and the second coolant injection command; and a means for opening and closing each coolant nozzle header based on the determination result of the third coolant injection determination means.

[0003] As an example of a rolling mill and rolling method that can obtain good plate shape control performance while optimizing equipment specifications for base coolant and spot coolant, Patent Document 2 describes a rolling mill that rolls plate material with a pair of upper and lower work rolls, which is equipped with a base coolant supplying means that sprays base coolant onto the work rolls and a spot coolant supplying means that sprays spot coolant onto the work rolls, and which is configured so that the flow rate ratio of the coolants sprayed from the base coolant supplying means and the spot coolant supplying means is set based on the operating temperature difference between the base coolant and the spot coolant. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 1933399 [Patent Document 2] Patent No. 3728784 Summary of the Invention [Problem to be solved by the invention]

[0005] Conventionally, when rolling special steels, especially when using small diameter work rolls, there have been problems with local shape defects such as elongation at the quarter (1 / 4) part of the plate width and tension at the 1 / 8 part. These local shape defects are local shape defects, and the shape control functions of conventional roll benders, crown adjustment devices, etc. were not effective. As examples of measures to improve this problem, the technologies described in the above-mentioned Patent Documents 1 and 2 have been devised.

[0006] In these Patent Documents 1 and 2, when large diameter work rolls are used in rolling ordinary steel or the like, there is an example in which a plurality of roll jet nozzles are arranged in a row in the plate width direction on the entry side and / or exit side, and the jet of coolant from the roll jet nozzles is turned on and off by selectively opening and closing each of the plurality of jet nozzles using an electromagnetic opening / closing valve provided in a coolant supply line of each of the plurality of jet nozzles, thereby correcting this localized shape defect.

[0007] However, these techniques require the provision of electromagnetic valves and piping for each coolant supply line for the multiple jet nozzles, which requires space, but when using small diameter work rolls in particular, the space is narrow to provide electromagnetic valves and piping for each coolant supply line for the multiple jet nozzles, making application difficult.

[0008] The present invention provides a rolling mill, a tandem rolling mill, and a coolant supply mechanism for a rolling mill equipped with a coolant spray capable of selectively spraying coolant, which can be applied to rolling mills with limited space in which small diameter work rolls are used. [Means for solving the problem]

[0009] The present invention includes a plurality of means for solving the above-mentioned problems. One example of the present invention is characterized in that it comprises at least one pair of work rolls for rolling a metal strip, and a coolant supply mechanism for spraying coolant onto the work rolls at at least one of the entrance side, exit side, upper side, and lower side in the pass direction of the metal strip, wherein the coolant supply mechanism comprises: a plurality of injection nozzles for spraying the coolant, which are arranged in a row in the width direction of the metal strip, a supply line for supplying the coolant to each of the injection nozzles, a header for storing the plurality of injection nozzles, a sliding member formed of any of a cylinder having one or more protrusions, a cylinder having one or more holes, and a ring-shaped plate movable in the width direction of the strip so as to selectively block or open the supply line within the header, and a drive unit for adjusting the amount of coolant sprayed from each of the plurality of injection nozzles by moving the sliding member. Effect of the Invention

[0010] According to the present invention, it is possible to selectively inject coolant, which is applicable to rolling mills with limited space in which small diameter work rolls are used. Other objects, configurations and effects than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a front view of a 20-high rolling mill according to a first embodiment of the present invention. [Diagram 2] 5 is a view taken along the line II-II' of FIG. 4. [Diagram 3] FIG. 2 is a cross-sectional view taken along the line III-III' of FIG. [Figure 4]4 is a cross-sectional view taken along the line IV-IV' of FIG. [Diagram 5] FIG. 4 is an explanatory diagram of all nozzle injection in a 20-high rolling mill according to a first reference example. [Figure 6] FIG. 4 is an explanatory diagram of partial nozzle jetting stop of the jet nozzle in the 20-stage rolling mill according to the first reference example. [Figure 7] FIG. 11 is an explanatory diagram of stopping injection from all injection nozzles in a 20-stage rolling mill according to a first reference example. [Figure 8] FIG. 4 is an explanatory diagram of partial nozzle injection of an injection nozzle in a 20-high rolling mill according to a first reference example. [Figure 9] FIG. 4 is a front view of another embodiment of the 20-high rolling mill according to the first embodiment of the present invention. [Figure 10] 10 is a cross-sectional view taken along the line XX' of FIG. 9. [Figure 11] FIG. 1 is a front view of a 20-high rolling mill according to a first embodiment of the present invention. [Figure 12] 12 is a cross-sectional view taken along the line XII-XII' of FIG. 11. [Figure 13] FIG. 2 is a diagram for explaining the state of injection from all nozzles in the 20-high rolling mill according to the first embodiment. [Figure 14] FIG. 11 is a diagram illustrating a state in which only a cross section 35b is closed in the 20-high rolling mill according to the first embodiment. [Figure 15] FIG. 11 is a diagram illustrating a state in which only cross section 35c is closed in the 20-high rolling mill according to the first embodiment. [Figure 16] FIG. 11 is an explanatory diagram illustrating a state in which only cross section 35d is closed in the 20-high rolling mill according to the first embodiment. [Figure 17] FIG. 11 is a diagram illustrating the state of injection from all nozzles in a 20-high rolling mill according to another embodiment of the first embodiment. [Figure 18] FIG. 11 is a diagram illustrating a state in which only the cross section 35b is opened in a 20-high rolling mill according to another embodiment of the first embodiment. [Figure 19] FIG. 11 is a diagram illustrating a state in which only the cross section 35c is opened in a 20-high rolling mill according to another embodiment of the first embodiment. [Figure 20]FIG. 11 is an explanatory diagram illustrating a state in which only the cross section 35d is opened in a 20-high rolling mill according to another embodiment of the first embodiment. [Figure 21] FIG. 11 is a diagram for explaining the state of injection from all nozzles in a 20-high rolling mill according to still another embodiment of the first embodiment. [Figure 22] FIG. 11 is a view for explaining a state in which only the cross section 35b is closed in a 20-high rolling mill according to still another embodiment of the first embodiment. [Figure 23] FIG. 13 is a view for explaining a state in which only the cross section 35c is closed in a 20-high rolling mill according to still another embodiment of the first embodiment. [Figure 24] FIG. 11 is a view for explaining a state in which only cross section 35d is closed in a 20-high rolling mill according to still another embodiment of the first embodiment. [Diagram 25] FIG. 4 is a front view of a four-high rolling mill according to a second embodiment of the present invention. [Figure 26] FIG. 11 is a front view of a six-high rolling mill according to a third embodiment of the present invention. [Figure 27] FIG. 11 is a front view of an 18-high rolling mill according to a fourth embodiment of the present invention. [Figure 28] 28 is a view taken along the arrows VV in FIG. 27. [Figure 29] FIG. 11 is a front view of a 12-high rolling mill according to a fifth embodiment of the present invention. [Diagram 30] FIG. 11 is a front view of a 20-high rolling mill according to a sixth embodiment of the present invention. [Diagram 31] FIG. 13 is a front view of a tandem rolling mill according to a seventh embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the rolling mill, the tandem rolling mill, and the rolling mill coolant supply mechanism of the present invention will be described with reference to the drawings. In the drawings used in this specification, the same or corresponding components are denoted by the same or similar reference numerals, and repeated description of these components may be omitted.

[0013] <1st reference example> A first embodiment of a rolling mill and a coolant supply mechanism for a rolling mill according to the present invention will be described with reference to Figs.

[0014] First, the overall configuration of the rolling mill and the configuration of the coolant supply mechanism will be described with reference to Figures 1 to 8. Figure 1 is a front view of a 20-high rolling mill according to the first embodiment, and is a cross-sectional view taken along the line I-I' in Figure 4, Figure 2 is a cross-sectional view taken along the line II-II' in Figure 4, Figure 3 is a cross-sectional view taken along the line III-III' in Figure 1, and Figure 4 is a cross-sectional view taken along the line IV-IV' in Figure 1. Figure 5 is an explanatory diagram of all nozzle injection from the injection nozzle, Figure 6 is an explanatory diagram of partial nozzle injection stop of the injection nozzle, Figure 7 is an explanatory diagram of all nozzle injection stop of the injection nozzle, and Figure 8 is an explanatory diagram of partial nozzle injection from the injection nozzle.

[0015] The rolling mill 100 of the first embodiment is a 20-high rolling mill as shown in FIG. 1 etc., and a strip 1 which is a material to be rolled is rolled by a pair of upper and lower work rolls 2.

[0016] Each of the pair of upper and lower work rolls 2 is supported in contact with two upper and lower pairs of first intermediate rolls 3. Each of the two upper and lower pairs of first intermediate rolls 3 is supported in contact with three upper and lower pairs of second intermediate rolls 4. Furthermore, each of the three upper and lower pairs of second intermediate rolls 4 is supported in contact with four upper and lower pairs of split backing bearing shafts (not shown) consisting of split backing bearings 5, shafts 6, and saddles (not shown for convenience of illustration). Furthermore, the four upper and lower pairs of split backing bearing shafts are supported by the saddles in the mill housing (not shown).

[0017] The rolling mill 100 of the first reference example is provided with a total of four coolant supply mechanisms that spray coolant for roll cooling and rolling lubrication onto a pair of upper and lower work rolls 2 from the entry and exit sides and from the top and bottom directions in the pass direction of the strip 1. Coolant oil is sprayed as a coolant spray 7 from these coolant supply mechanisms.

[0018] At this time, the portions where the coolant spray 7 hits the surfaces of the pair of upper and lower work rolls 2 are shown in Figs. 3 and 4 as spray marks 19.

[0019] Although the coolant supply mechanisms are described as being provided on all of the entrance side, exit side, upper side, and lower side in the path direction of the strip 1, it is sufficient that they are provided in at least one of these four locations.

[0020] The coolant supply mechanism includes injection nozzles 8a, 8b, 8c, 8d, 8e, 8f, 8g, and 8h (hereinafter also referred to as "injection nozzles 8"), holes 9a, 9b, 9c, 9d, 9e, 9f, 9g, and 9h (hereinafter also referred to as "holes 9"), headers 12a, 12b, 12c, and 12d (hereinafter also referred to as "headers 12"), a tube 11, gears 13a, 13b, 13c, 13d, 13e, 13f, 13g, and 13h (hereinafter also referred to as "gears 13"), and fan-shaped gears 14a, 14b, 14c, 14d, 14e, 14f, 14g, and 14h (hereinafter also referred to as "fan-shaped gears 14"). Also referred to as "first pin 15"), second pins 15a, 15b, 15c, 15d, 15e, 15f, 15g, and 15h (hereinafter also referred to as "second pin 15"), pins 16a, 16b, 16c, 16d, 16e, 16f, 16g, and 16h (hereinafter also referred to as "pin 16"), fork ends 17a, 17b, 17c, 17d, 17e, 17f, 17g, and 17h (hereinafter also referred to as "fork ends 17"), and hydraulic cylinders 18a, 18b, 18c, 18d, 18e, 18f, 18g, and 18h ​​(hereinafter also referred to as "hydraulic cylinders 18").

[0021] In addition, in Figure 1 etc., the symbols "a, b, c, d, e, f, g, h" indicate the operating side at the upper exit side of strip 1 with "a", the drive side at the upper exit side of strip 1 with "b", the operating side at the lower exit side of strip 1 with "c", the drive side at the lower exit side of strip 1 with "d", the operating side at the upper entry side of strip 1 with "e", the drive side at the upper entry side of strip 1 with "f", the operating side at the lower entry side of strip 1 with "g", and the drive side at the lower entry side of strip 1 with "h", respectively.

[0022] In addition, in Figure 1 etc., the symbols "a, b, c, d" indicate the upper exit side of the strip 1 as "a", the lower exit side of the strip 1 as "b", the upper entry side of the strip 1 as "c", and the lower entry side of the strip 1 as "d", respectively.

[0023] Furthermore, in Fig. 1 and other figures, parentheses are used to indicate structures that are difficult to illustrate due to the presence of the same structure in front, for example, in Fig. 1, jet nozzle 8b is located in a position that cannot be illustrated due to jet nozzle 8a. The same applies to other parenthesized symbols.

[0024] A plurality of injection nozzles 8 are provided in a row in the width direction of the strip 1, and are members for injecting coolant onto the work rolls 2.

[0025] The holes 9 are for supplying coolant to each of the injection nozzles 8 and are provided in the headers 12, respectively.

[0026] The header 12 is a member that houses a plurality of jet nozzles 8 .

[0027] Coolant oil is supplied to coolant flow paths 10a, 10b, 10c, 10d, 10e, 10f, 10g, and 10h (hereinafter also referred to as "coolant flow path 10") in a header 12 via a pump (not shown) and piping, and is sprayed as a coolant spray 7 from an injection nozzle 8 via a tube 11 and a hole 9.

[0028] The tube 11 is a member that selectively closes or opens the holes 9 in the header 12, and is composed of a cylinder with multiple holes. More specifically, as shown in Figures 5 and 6, multiple long holes or holes are provided on the outer circumferential surface of the tube 11, and the tube 11 is attached to each header 12 so as to be rotatable and slidable. Note that the number of holes does not need to be multiple; one hole will suffice.

[0029] Moreover, the rolling mill 100 of the first embodiment has a drive mechanism for adjusting the amount of coolant sprayed by each of the multiple spray nozzles 8 provided by moving the tubes 11.

[0030] The drive mechanism is composed of a gear 13, a sector gear 14, a second pin 15, a pin 16, a fork end 17, a hydraulic cylinder 18, etc. In this drive mechanism, each sector gear 14 and each hydraulic cylinder 18 are connected via each pin 16 at the fork end 17 provided at the end of each hydraulic cylinder 18.

[0031] Each sector gear 14 is configured to rotate around a corresponding second pin 15. Each sector gear 14 meshes with a gear 13 provided on the tube 11.

[0032] When the hydraulic cylinder 18 extends or retracts, the vertical positions of the fork end 17 and the pin 16 change, causing the sector gear 14 to rotate around the second pin 15. As the sector gear 14 rotates, the gear 13 provided on the tube 11 also rotates, causing the tube 11 to rotate.

[0033] As shown in Figures 5 and 6, the tube 11 has a plurality of holes 11a on its outer surface, and by adjusting the pattern of the holes 11a and the rotation angle of the tube 11, it is possible to adjust the amount of coolant from each spray nozzle 8 from 0 to a fixed value, or to switch between 0 and the fixed value.

[0034] The rotation of the tube 11 may be controlled by a control unit (equivalent to a control unit 57 in a sixth embodiment described later, not shown) or by an operator's operation.

[0035] For example, if the holes 11a are arranged in a multiple long hole pattern as shown in the development of the tube 11 in Figures 5 and 6, when the rotation angle of the tube 11 in Figure 5 is 0 degrees, the positions of the holes 11a and the holes 9 in the tube 11 are aligned all over the plate width direction, and the coolant spray 7 is sprayed from all of the spray nozzles 8. In this state, the plate shape may suffer from harmful localized stretching in the 1 / 8 plate width portion as shown in Figure 5.

[0036] Here, as shown in FIG. 6, when the tube 11 is rotated to the rotation angle shown in the figure, at the point 20b, the position of the hole 9 coincides with the position of the hole 11a of the tube 11, and the spray nozzle 8 is not blocked at this point 20b, so that the coolant spray 7 is sprayed from that part.

[0037] In contrast, at the portion 20a, the position of the hole 9 does not coincide with the position of the hole 11a of the tube 11, and the spray nozzle 8 is blocked by the tube 11 at this portion 20a, so that the coolant spray 7 is not sprayed from that portion.

[0038] In the case of Figure 6, the area of ​​the work roll 2 where the coolant spray 7 is not sprayed (area A in Figure 6) is not cooled as much as the other areas, so that area expands more than the other areas and the diameter becomes larger. As a result, the strip 1 is rolled more than the other areas, and the harmful local tension of the strip shape is eliminated or reduced, improving the shape to a gentle slope.

[0039] Here, the hole pattern of the tube 11 is not limited to the patterns shown in Figures 5 and 6. As shown in Figures 7 and 8, if a pattern such as multiple short holes 11a1 is used as in tube 11A, when the rotation angle of tube 11A in Figure 7 is 0 degrees, the positions of holes 11a1 of tube 11A and the positions of holes 9 do not match at all points in the plate width direction, and no coolant spray 7 is sprayed from spray nozzle 8. In this state, as shown in Figure 7, harmful partial local elongation may occur in the plate shape, as in Figure 5.

[0040] Here, as shown in FIG. 8, when the tube 11A is rotated to the rotation angle shown in the figure, at the point 21b, the position of the hole 9 coincides with the position of the hole 11a1 of the tube 11A, and the spray nozzle 8 is not blocked at this point 21b, so that the coolant spray 7 is sprayed from that part.

[0041] In contrast, at the portion 21a, the position of the hole 9 does not coincide with the position of the hole 11a1 of the tube 11A, and the spray nozzle 8 is blocked by the tube 11A at this portion 21a, so that the coolant spray 7 is not sprayed from that portion.

[0042] In the case of Figure 8, the part of the work roll 2 where the coolant spray 7 is sprayed (area B in Figure 8) is cooled more than other parts, so that part alone experiences less thermal expansion than other parts and its diameter becomes smaller. As a result, the rolling is lighter than other parts, and the strip shape is improved to a gently inclined shape with no or reduced harmful local elongation.

[0043] In this way, if the injection amount of the injection nozzle 8 at the same width direction position as the locally stretched portion of the strip shape is reduced or set to zero, and / or the injection amount of the injection nozzle 8 at other width direction positions is increased, the cooling of that portion will become relatively insufficient, the thermal crown of that portion of the work roll 2 will grow, and the strip will tend to elongate only in that portion, resulting in a reduction in the local excessive tension of the strip shape.

[0044] Furthermore, if the injection amount of the injection nozzle 8 at the same widthwise position as the part where the strip shape is locally elongated is increased and / or the injection amount of the injection nozzle 8 at other widthwise positions is reduced or set to zero, that part will be cooled relatively more, the thermal crown of that part of the work roll 2 will decrease, and only that part will tend to become stretched, resulting in a reduction in the local excessive elongation of the strip shape.

[0045] In the first reference example, the tube 11 is divided into two, an operating side and a driving side, and each side is rotated independently, so that the coolant spray 7 can also be sprayed independently on the operating side and the driving side, which is effective when the plate shape is asymmetrical.

[0046] The tube 11 may be integrated on the operating side and the driving side. In this case, when the pattern of the holes 11a of the tube 11 is symmetrical about the center of the plate width, the coolant spray 7 sprays coolant symmetrically about the center of the plate width of the strip 1, but the driving device is only on one side, the operating side or the driving side, which is an advantage in that the structure is further simplified. The pattern of the holes 11a does not need to be symmetrical about the center of the plate width and can be changed as appropriate.

[0047] Next, a rolling mill and a modified embodiment of a coolant supply mechanism for a rolling mill according to the first embodiment will be described with reference to Fig. 9 and Fig. 10. Fig. 9 is a front view of another embodiment of a 20-high rolling mill according to the first embodiment, and Fig. 10 is a cross-sectional view taken along the line XX in Fig. 9.

[0048] A rolling mill 100A shown in Figs. 9 and 10 has the same configuration as the rolling mill 100 shown in Fig. 1 etc., except for the configuration of the drive mechanism that rotates the tubes 11, 11A.

[0049] The drive mechanism of the rolling mill 100A is composed of rotary cylinders 25a, 25b, 25c, 25d, 25e, 25f, 25g, and 25h (hereinafter also referred to as "rotary cylinder 25"), sprockets 24a, 24b, 24c, 24d, 24e, 24f, 24g, and 24h (hereinafter also referred to as "sprocket 24"), chains 23a, 23b, 23c, 23d, 23e, 23f, 23g, and 23h (hereinafter also referred to as "chain 23"), and sprockets 22a, 22b, 22c, 22d, 22e, 22f, 22g, and 22h (hereinafter also referred to as "sprocket 22").

[0050] 9 and 10, a sprocket 24 is attached to the output shaft of a rotary cylinder 25, and a chain 23 is engaged with the sprocket 24 so as to be drivable. Furthermore, a sprocket 22 is engaged with the side of the chain 23 opposite to the side engaged with the sprocket 24. The sprocket 22 is attached to the ends of the tubes 11, 11A.

[0051] When the tubes 11, 11A are rotated, the sprocket 24 is driven by the rotation of the rotary cylinder 25, and the tubes 11, 11A are rotated via the chain 23 and the sprocket 22.

[0052] A hydraulic motor or an electric motor may be used instead of the rotary cylinder 25. A timing belt may be used instead of the chain 23.

[0053] Next, the effects of this embodiment will be described.

[0054] The rolling mill 100 of the first reference example of the present invention described above includes at least one pair of work rolls 2 for rolling the strip 1, and a coolant supply mechanism for spraying coolant onto the work rolls 2 at least at one of the entry side, exit side, upper side, and lower side in the pass direction of the strip 1. The coolant supply mechanism includes a plurality of injection nozzles 8 for spraying coolant, which are arranged in a row in the width direction of the strip 1, holes 9 for supplying coolant to each of the injection nozzles 8, a header 12 for storing the plurality of injection nozzles 8, tubes 11 for selectively closing or opening the holes 9 within the header 12, and a hydraulic cylinder 18 for adjusting the amount of coolant sprayed from each of the plurality of injection nozzles 8 by moving the tube 11.

[0055] For example, in a cluster-type 12-high rolling mill such as the fifth embodiment described below, a 20-high rolling mill such as the first reference example, and an 18-high rolling mill such as the fourth embodiment, the space is narrow, and it is difficult to provide electromagnetic opening and closing valves and piping in each of the coolant supply lines of the multiple injection nozzles.

[0056] In addition, with respect to the four-high rolling mill of the second embodiment or the six-high rolling mill of the third embodiment, if electromagnetic opening / closing valves and piping are provided in each coolant supply line of the multiple injection nozzles, the large number of them will result in high costs.

[0057] However, the coolant supply mechanism of the present invention has a simple structure, which eliminates the need for electromagnetic valves and piping, and can be installed even in a small space for a small diameter work roll. Also, the cost can be reduced.

[0058] Also, for example, the amount of coolant from each injection nozzle 8 can be adjusted from 0 to a constant value, or can be switched between 0 and a constant value, depending on the strip shape. Therefore, the amount of thermal crown of the work roll is changed according to the difference in the local cooling degree, and the strip shape is controlled, which is effective in improving local shape defects.

[0059] Such a rolling mill is suitable for producing strip plates of high product quality, such as high plate shape accuracy, in rolling soft materials such as ordinary steel plates and aluminum alloys, and particularly hard materials such as stainless steel plates, electromagnetic steel plates, and copper alloys.

[0060] Furthermore, since the sliding members are configured of cylindrical tubes 11, 11A having a plurality of holes, partial supply of coolant can be easily achieved with a simple configuration.

[0061] Furthermore, since the tubes 11, 11A are divided into two, a drive side and a working side, even if the surface shape of the strip 1 is asymmetric, it is possible to control the supply of coolant according to the surface shape, making it possible to obtain a strip 1 with a higher quality surface shape.

[0062] <First Example> A rolling mill and a coolant supply mechanism for a rolling mill according to a first embodiment of the present invention will be described with reference to Figs.

[0063] Figure 11 is a front view of a 20-high rolling mill for this first embodiment, Figure 12 is a cross-sectional view taken along the XII-XII' arrow in Figure 11, Figure 13 is a diagram explaining the state in which all nozzles of the injection nozzle are injected, Figure 14 is a diagram explaining the state in which only cross section 35b is closed, Figure 15 is a diagram explaining the state in which only cross section 35c is closed, and Figure 16 is an explanatory diagram explaining the state in which only cross section 35d is closed.

[0064] The rolling mill 100B of the first embodiment shown in Figure 11 differs from the rolling mill 100 of the first reference example in the configuration of the sliding members (tubes 11, 11A) that selectively block or open the holes 9 within the header 12, and the sliding members are composed of either a shielding body 26, 37 or a shielding plate 43.

[0065] These shields 26, 37 and shield plate 43 are composed of any one of a cylinder having one or more protrusions, a cylinder having one or more holes, and a ring-shaped plate movable in the plate width direction. The details will be described below.

[0066] In the rolling mill 100B of the first embodiment, as shown in Figs. 11 and 12, coolant oil is supplied to a coolant passage 10 of a header 12 via a pump (not shown) and piping.

[0067] Furthermore, the coolant spray 7 is sprayed from the spray nozzle 8 via primary holes 30a, 30b, 30c, 30d, 30e, 30f, 30g, and 30h (hereinafter also referred to as "primary holes 30"), coolant flow paths 28a, 28b, 28c, 28d, 28e, 28f, 28g, and 28h (hereinafter also referred to as "coolant flow paths 28"), shields 26a, 26b, 26c, 26d, 26e, 26f, 26g, and 26h (hereinafter also referred to as "shields 26"), and holes 29a, 29b, 29c, 29d, 29e, 29f, 29g, and 29h (hereinafter also referred to as "holes 29").

[0068] A plurality of protrusions 27a, 27b, 27c, 27d, 27e, 27f, 27g, and 27h (hereinafter also referred to as "protrusions 27") are provided on the surface of the cylindrical shield 26, and are attached in a rotatable and slidable manner within the coolant flow passage 28. Note that instead of or in addition to the protrusions 27, notches can be provided.

[0069] The drive mechanism of the shield 26 is composed of rotary cylinders 34a, 34b, 34c, 34d, 34e, 34f, 34g, and 34h (hereinafter also referred to as "rotary cylinder 34"), sprockets 33a, 33b, 33c, 33d, 33e, 33f, 33g, and 33h (hereinafter also referred to as "sprocket 33"), chain 32a, 32b, 32c, 32d, 32e, 32f, 32g, and 32h (hereinafter also referred to as "chain 32"), and sprockets 31a, 31b, 31c, 31d, 31e, 31f, 31g, and 31h (hereinafter also referred to as "sprocket 31").

[0070] A sprocket 33 is attached to the output shaft of the rotary cylinder 34a, and a chain 32a is engaged with the sprocket 33 so as to be drivable, and a sprocket 31 is engaged with the other side of the chain 32. The sprocket 31 is attached to the end of the shield 26.

[0071] The rotary cylinder 34 is driven to rotate, thereby driving the sprocket 33, and the shield 26 is rotated via the chain 32 and the sprocket 31.

[0072] Here, a hydraulic motor or an electric motor can be used for the rotary cylinder 34. Also, the chain 32 may be a timing belt.

[0073] In the rolling mill 100B, the projections 27 of the shield 26 are rotated to open and close the holes 29, thereby adjusting the amount of coolant from the injection nozzle 8 from 0 to a fixed value, or switching between 0 and the fixed value.

[0074] When the pattern of the projections 27 of the shield 26 is as shown in Fig. 13 etc., when the rotation angle of the shield 26 is 0 degrees, the positions of the projections 27 and the positions of the holes 29 do not match over the entire width of the plate, as shown in cross sections 35a, 35b, 35c, 35d, and 35e, and the coolant spray 7 is sprayed from all the spray nozzles 8 in the width of the plate. In particular, even if the projections 27 match the positions of the primary holes 30, the coolant can be diverted by the relief grooves 36e (, 36a, 36b, 36c, and 36d), so the coolant spray 7 is sprayed.

[0075] 14, when the rotation angle of the shield 26 is 45 degrees, the positions of the projection 27 and the holes 29 do not match at the positions of the cross sections 35a, 35c, 35d, and 35e, and the coolant spray 7 is sprayed. In contrast, at the position of the cross section 35b, the positions of the projection 27 and the holes 29 match, and the amount of coolant sprayed is reduced or becomes zero.

[0076] 15, when the rotation angle of the shield 26 is 90 degrees, the positions of the projection 27 and the holes 29 do not match at the positions of the cross sections 35a, 35b, 35d, and 35e, and the coolant spray 7 is sprayed. In contrast, at the position of the cross section 35c, the positions of the projection 27 and the holes 29 match, and the amount of coolant sprayed is reduced or zero.

[0077] 16, when the rotation angle of the shield 26 is 135 degrees, the positions of the projections 27 and the holes 29 do not match at the positions of the cross sections 35a, 35b, 35c, and 35e, and the coolant spray 7 is sprayed. In contrast, at the position of the cross section 35d, the positions of the projections 27 and the holes 29 match, and the amount of coolant sprayed is reduced or zero.

[0078] Next, modified forms of the sliding member will be described with reference to Fig. 17 to Fig. 20. Fig. 17 is an explanatory diagram for explaining the state of injection from all injection nozzles in a 20-high rolling mill according to another embodiment of the first embodiment, Fig. 18 is an explanatory diagram for explaining the state of only cross section 35b being open, Fig. 19 is an explanatory diagram for explaining the state of only cross section 35c being open, and Fig. 20 is an explanatory diagram for explaining the state of only cross section 35d being open.

[0079] In this embodiment, the sliding member is a cylindrical shield 37 having one or more flow passage holes 38 therein, instead of the shield 26, as shown in FIG.

[0080] In the shield 37, by adjusting its rotation, each hole 29 is opened and closed by moving the flow path hole 38, thereby adjusting the amount of coolant in the injection nozzle 8 from 0 to a constant value, or switching between 0 and the constant value.

[0081] If the pattern of the flow path holes 38 of the shield 37 is as shown in Figure 17, when the rotation angle of the shield 37 is 0 degrees as shown in Figure 17, the positions of the flow path holes 38 and the positions of the holes 29 all coincide, as shown in cross sections 35a, 35b, 35c, 35d, and 35e, and coolant spray 7 is sprayed from all spray nozzles 8 in the plate width direction.

[0082] 18, when the rotation angle of the shield 37 is 45 degrees, the positions of the flow passage hole 38 and the hole 29 do not match at the positions of the cross sections 35a, 35c, 35d, and 35e, and the amount of coolant sprayed is reduced or is zero. In contrast, at the position of the cross section 35b, the positions of the flow passage hole 38 and the hole 29 match, and the coolant spray 7 is sprayed.

[0083] 19, when the rotation angle of the shield 37 is 90 degrees, the positions of the flow passage hole 38 and the hole 29 do not match at the positions of the cross sections 35a, 35b, 35d, and 35e, and the amount of coolant sprayed is reduced or zero. In contrast, at the position of the cross section 35c, the positions of the flow passage hole 38 and the hole 29 match, and the coolant spray 7 is sprayed.

[0084] 20, when the rotation angle of the shield 37 is 135 degrees, the positions of the flow passage hole 38 and the hole 29 do not match at the positions of the cross sections 35a, 35b, 35c, and 35e, and the amount of coolant sprayed is reduced or zero. In contrast, at the position of the cross section 35d, the positions of the flow passage hole 38 and the hole 29 match, and the coolant spray 7 is sprayed.

[0085] The shields 26, 37 may be integrated on the operation side and the drive side, similar to the tubes 11, 11A. In this case, when the patterns of the projections 27 and the flow passage holes 38 are symmetrical about the center of the plate width, the coolant spray 7 will be sprayed symmetrically, but there is an advantage that the drive device is only on one side, the operation side or the drive side, and the structure is simple. The patterns of the projections 27 and the flow passage holes 38 do not need to be symmetrical about the center of the plate width and can be changed as appropriate.

[0086] Next, further modified embodiments of the sliding member will be described with reference to Fig. 21 to Fig. 24. Fig. 21 is a diagram for explaining the state in which all the injection nozzles in a 20-high rolling mill are injecting in accordance with yet another embodiment of the first embodiment, Fig. 22 is a diagram for explaining the state in which only the cross section 35b is closed, Fig. 23 is a diagram for explaining the state in which only the cross section 35c is closed, and Fig. 24 is a diagram for explaining the state in which only the cross section 35d is closed.

[0087] As shown in FIG. 21 etc., the sliding member may be a shielding plate 43 that is movable in the plate width direction, instead of the shielding bodies 26, 37.

[0088] The shielding plate 43 is positioned outside the screw shaft 42. When the screw shaft 42 rotates, the shielding plate 43 shifts in the axial direction of the screw shaft 42 (i.e., the plate width direction) to open and close each hole 29 as appropriate, thereby adjusting the amount of coolant in the injection nozzle 8 from 0 to a constant value, or switching between 0 and the constant value.

[0089] If the position of the shielding plate 43 is as shown in Figure 21, etc., when the position of the shielding plate 43 is as shown in Figure 21, the position of the shielding plate 43 does not coincide with the position of the hole 29, as shown in cross sections 35a, 35b, 35c, 35d, and 35e, and coolant spray 7 is sprayed from all injection nozzles 8 in the plate width direction.

[0090] 22, the positions of the shielding plate 43 and the holes 29 do not match at the positions of the cross sections 35a, 35c, 35d, and 35e, and the coolant spray 7 is sprayed. In contrast, at the position of the cross section 35b, the positions of the shielding plate 43 and the holes 29 match, and the amount of coolant sprayed is reduced or zero.

[0091] 23, the positions of the shielding plate 43 and the holes 29 do not match at the positions of the cross sections 35a, 35b, 35d, and 35e, and the coolant spray 7 is sprayed. In contrast, at the position of the cross section 35c, the positions of the shielding plate 43 and the holes 29 match, and the amount of coolant sprayed is reduced or zero.

[0092] 24, the positions of the shielding plate 43 and the holes 29 do not match at the cross sections 35a, 35b, 35c, and 35e, and the coolant spray 7 is sprayed. In contrast, at the cross section 35d, the positions of the shielding plate 43 and the holes 29 match, and the amount of coolant sprayed is reduced or zero.

[0093] Also, the screw shaft 42 can be integrated on the operating side and the driving side, and can be reverse-threaded with a right-handed thread and a left-handed thread on the operating side and the driving side. In this case, the shielding plate 43 can be moved symmetrically on the operating side and the driving side by only rotating one side, either the operating side or the driving side. In this case, the coolant spray 7 is sprayed symmetrically, but the driving device is only on one side, either the operating side or the driving side, which has the advantage of simplifying the structure.

[0094] The other configurations and operations are substantially the same as those of the first reference example described above, and the details are omitted.

[0095] In the first embodiment of the present invention, substantially the same effects as those of the first reference example described above can be obtained.

[0096] In addition, the sliding member is composed of any one of a cylindrical shield 26 having one or more protrusions, a cylindrical shield 37 having one or more holes, and a shield plate 43 movable in the plate width direction, so that partial coolant supply can be easily achieved with a simple configuration.

[0097] <Second Example> A rolling mill and a coolant supply mechanism for a rolling mill according to a second embodiment of the present invention will be described with reference to Fig. 25. Fig. 25 is a front view of a four-high rolling mill according to the second embodiment.

[0098] 25, the rolling mill 100C of the second embodiment is a four-high rolling mill, and a strip 1, which is a rolled material, is rolled by a pair of upper and lower work rolls 2. The pair of upper and lower work rolls 2 are each supported in contact with a pair of upper and lower backup rolls 44.

[0099] This rolling mill 100C also includes the coolant supply mechanism explained in the first reference example and the first embodiment.

[0100] The four-high rolling mill 100C of the second embodiment has a relatively small number of rolls and has ample space, but the coolant supply mechanism described in the first reference example and the first embodiment does not use many solenoid valves and has a simple structure, which is advantageous in that it is inexpensive.

[0101] The other configurations and operations are substantially the same as those of the first reference example or the first embodiment described above, and details thereof will be omitted.

[0102] <Third Example> A rolling mill and a coolant supply mechanism for the rolling mill according to a third embodiment of the present invention will be described with reference to Fig. 26. Fig. 26 is a front view of a six-high rolling mill according to the third embodiment.

[0103] 26, the rolling mill 100D of the third embodiment is a six-high rolling mill, and a strip 1, which is a material to be rolled, is rolled by a pair of upper and lower work rolls 2. Each of the pair of upper and lower work rolls 2 is supported in contact with a pair of upper and lower intermediate rolls 45, and each of the pair of upper and lower intermediate rolls 45 is supported in contact with a pair of upper and lower backup rolls 46.

[0104] This rolling mill 100D also includes the coolant supply mechanism explained in the first reference example and the first embodiment.

[0105] The six-high rolling mill 100D of the third embodiment has a relatively small number of rolls and has ample space, but the coolant supply mechanisms described in the first reference example and the first embodiment do not use many solenoid valves and have a simple structure, which is advantageous in that they are inexpensive.

[0106] The other configurations and operations are substantially the same as those of the first reference example or the first embodiment described above, and details thereof will be omitted.

[0107] <Fourth Example> A rolling mill and a coolant supply mechanism for a rolling mill according to a fourth embodiment of the present invention will be described with reference to Fig. 27 and Fig. 28. Fig. 27 is a front view of an 18-high rolling mill according to the fourth embodiment, and Fig. 28 is a view taken along the arrows VV in Fig. 27.

[0108] 27 and 28, the rolling mill 100E of the fourth embodiment is an 18-high rolling mill, in which a strip 1, which is the material to be rolled, is rolled by a pair of upper and lower work rolls 2. Each of the pair of upper and lower work rolls 2 is supported in contact with a pair of upper and lower intermediate rolls 47, and each of the pair of upper and lower intermediate rolls 47 is supported in contact with a pair of upper and lower backup rolls 48. The work rolls 2 are supported in the horizontal direction by four pairs of support rolls 49 and eight pairs of support bearings 50 which support the support rolls 49. The support bearings 50 are supported by arms 52 via shafts 51, and the arms 52 are supported by side beams 53.

[0109] This rolling mill 100E also includes the coolant supply mechanism explained in the first reference example and the first embodiment.

[0110] Here, in the rolling mill 100E, the tube 11 is housed within the side beam 53 so as to be rotatable.

[0111] In an 18-stage rolling mill 100E such as that of the fourth embodiment, there is limited space due to the presence of a group of support rolls, but the coolant supply mechanism described in the first reference example and the first embodiment above is compact and can therefore be easily applied even to an 18-stage rolling mill with limited space.

[0112] The other configurations and operations are substantially the same as those of the first reference example or the first embodiment described above, and details thereof will be omitted.

[0113] <Fifth Example> A rolling mill and a coolant supply mechanism for the rolling mill according to a fifth embodiment of the present invention will be described with reference to Fig. 29. Fig. 29 is a front view of a 12-high rolling mill according to the fifth embodiment.

[0114] 29, the rolling mill 100F of the fifth embodiment is a 12-high rolling mill, in which a strip 1, which is a material to be rolled, is rolled by a pair of upper and lower work rolls 2. Each of the pair of upper and lower work rolls 2 is supported in contact with two pairs of upper and lower intermediate rolls 54, and each of the two pairs of upper and lower intermediate rolls 54 is supported in contact with three pairs of upper and lower split backing bearing shafts 55.

[0115] This rolling mill 100F also includes the coolant supply mechanism explained in the first reference example and the first embodiment.

[0116] In a 12-high rolling mill 100F such as that of the fifth embodiment, there is limited space due to the cluster roll arrangement, but the coolant supply mechanism described in the first reference example and the first embodiment above is compact and can therefore be easily applied even to a 12-high rolling mill with limited space.

[0117] The other configurations and operations are substantially the same as those of the first reference example or the first embodiment described above, and details thereof will be omitted.

[0118] <Sixth Example> A rolling mill and a coolant supply mechanism for a rolling mill according to a sixth embodiment of the present invention will be described with reference to Fig. 30. Fig. 30 is a front view of a 20-high rolling mill according to the sixth embodiment.

[0119] As shown in FIG. 30, a rolling mill 100G of the sixth embodiment is a 20-high rolling mill, and is provided with a shape detection roller 56 for detecting the shape of the strip 1 on the delivery side of the rolling mill 100G.

[0120] Also provided is a control unit 57 that controls the operation of the hydraulic cylinder 18 to move the tube 11 so as to correct shape defects such as localized elongation or tension based on the plate shape detected by the shape detection roller 56. This control unit 57 is preferably composed of a computer equipped with a CPU, a storage medium, a display device, etc.

[0121] The control unit 57 adjusts the amount of coolant from each injection nozzle 8 by adjusting the pattern of the multiple long holes or holes on the outer circumferential surface of the tube 11 and the rotation angle of the tube 11, thereby correcting this local shape defect.

[0122] More specifically, the injection amount of the injection nozzle 8 at the same position in the width direction of the sheet as the locally tensed portion of the sheet shape can be reduced or set to zero, and the injection amount of the other injection nozzles 8 can be increased.

[0123] Alternatively, the injection amount of the injection nozzle 8 located at the same position in the width direction of the sheet as the portion where the sheet shape is locally elongated can be increased, and the injection amount of the other injection nozzles 8 can be decreased or set to zero.

[0124] In addition, the coolant in the first reference example supply Although the case where the mechanism is applied has been described, the modified example of the first reference example and the coolant supply mechanism of the first embodiment can also be applied.

[0125] The other configurations and operations are substantially the same as those of the first reference example or the first embodiment described above, and details thereof will be omitted.

[0126] In the sixth embodiment of the present invention, substantially the same effects as those in the first reference example or the first embodiment described above can be obtained.

[0127] In addition, the rolling mill further includes a shape detection roller 56 that is arranged on the exit side of the rolling mill and detects the plate shape of the strip 1, and a control unit 57 that controls the operation of the hydraulic cylinder 18 to move the tubes 11, 11A, the shields 26, 37, and the shielding plate 43 so as to correct shape defects such as localized elongation or tension based on the plate shape detected by the shape detection roller 56. This makes it easier to control the coolant supply according to the shape of the strip 1, and makes it easier to achieve further improvements in the plate shape.

[0128] Furthermore, the control unit 57 reduces or sets to zero the injection amount of the injection nozzle 8 at the same position in the width direction of the plate as the part where the plate shape is locally stretched, and increases the injection amount of the other injection nozzles 8, thereby increasing the injection amount of the injection nozzle 8 at the same position in the width direction of the plate as the part where the plate shape is locally stretched, and reducing or setting the injection amount of the other injection nozzles 8 to zero, thereby more reliably improving the plate shape.

[0129] <Seventh Example> A tandem rolling mill according to a seventh embodiment of the present invention will be described with reference to Fig. 31. Fig. 31 is a front view of a tandem rolling mill in which a plurality of 20-high rolling mills according to the seventh embodiment are arranged in rows.

[0130] As shown in Fig. 31, the seventh embodiment is a tandem rolling mill 200 in which a plurality of rolling mill stands are arranged. In Fig. 31, the rolling mill 100 described in the first reference example is provided in the final stand. Since the rolling mill 100 of the first reference example is arranged in the final stand, it is effective in correcting local shape defects of the plate shape in the final rolling pass.

[0131] Other configurations and operations of the rolling mill 100 are substantially the same as those of the first embodiment described above, and detailed description thereof will be omitted.

[0132] In the seventh embodiment of the present invention, substantially the same effects as those of the first reference embodiment described above can be obtained.

[0133] Note that any one of the rolling mills 100A, 100B, 100C, 100D, 100E, 100F, and 100G of the modified example of the first reference example to the sixth embodiment may be provided instead of the rolling mill 100. Also, not limited to the final stand, any one or more of the rolling mills 100, 100A, 100B, 100C, 100D, 100E, 100F, and 100G described in the first reference example to the sixth embodiment may be provided in other stands.

[0134] <Other> The present invention is not limited to the above-mentioned embodiment, but includes various modified examples. The above-mentioned embodiment has been described in detail to explain the present invention in an easily understandable manner, and the present invention is not necessarily limited to the embodiment having all of the described configurations.

[0135] It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace part of the configuration of each embodiment with the configuration of another embodiment. [Explanation of symbols]

[0136] 1…Belt 2...Work roll 3…First intermediate roll 4…Second intermediate roll 5...Split backing bearing 6...Axis 7…Coolant spray 8, 8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h...Injection nozzle 9,9a,9b,9c,9d,9e,9f,9g,9h...hole (supply line) 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h...Coolant flow path (supply line) 11, 11A...Tube (sliding member) 11a,11a1…hole 12, 12a, 12b, 12c, 12d...Header 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h...Gear (drive part) 14, 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h... Sector gear (drive unit) 15, 15a, 15b, 15c, 15d, 15e, 15f, 15g, 15h...Second pin (drive part) 16, 16a, 16b, 16c, 16d, 16e, 16f, 16g, 16h...Pin (drive part) 17, 17a, 17b, 17c, 17d, 17e, 17f, 17g, 17h...Fork end (drive part) 18, 18a, 18b, 18c, 18d, 18e, 18f, 18g, 18h...Hydraulic cylinder (drive unit) 19...Spray mark 20a, 21a...locations (closed) 20b, 21b…location (open) 22, 22a, 22b, 22c, 22d, 22e, 22f, 22g, 22h...Sprockets (drive parts) 23, 23a, 23b, 23c, 23d, 23e, 23f, 23g, 23h...Chain (drive part) 24, 24a, 24b, 24c, 24d, 24e, 24f, 24g, 24h...Sprockets (drive parts) 25, 25a, 25b, 25c, 25d, 25e, 25f, 25g, 25h...Rotary cylinder (drive unit) 26, 26a, 26b, 26c, 26d, 26e, 26f, 26g, 26h...Shields (sliding members) 27,27a,27b,27c,27d,27e,27f,27g,27h...Protrusions 28, 28a, 28b, 28c, 28d, 28e, 28f, 28g, 28h...Coolant flow path (supply line) 29, 29a, 29b, 29c, 29d, 29e, 29f, 29g, 29h...holes (supply lines) 30, 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h...Primary holes (supply lines) 31, 31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h...Sprockets (drive parts) 32, 32a, 32b, 32c, 32d, 32e, 32f, 32g, 32h...Chain (drive part) 33, 33a, 33b, 33c, 33d, 33e, 33f, 33g, 33h...Sprockets (drive parts) 34, 34a, 34b, 34c, 34d, 34e, 34f, 34g, 34h...Rotary cylinder (drive unit) 35a, 35b, 35c, 35d, 35e...cross section 36a, 36b, 36c, 36d, 36e...Relief groove 37...Shield (sliding member) 38...Flow passage hole 42...Screw shaft 43...Shielding plate (sliding member, ring-shaped plate) 44, 46, 48…Reinforcement rolls 45,47…Middle roll 49…Support roll 50…Support bearing 51...Axis 52…Arm 53…Side beam 54…Middle roll 55...Split backing bearing shaft 56...Shape detection roller (shape detector) 57...Control section 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G...Rolling mill 200…Tandem rolling mill

Claims

1. At least one pair of work rolls for rolling the metal strip; a coolant supply mechanism for spraying coolant onto the work roll at at least one of an entrance side, an exit side, an upper side, and a lower side in a path direction of the metal strip; The coolant supply mechanism includes: a plurality of injection nozzles arranged in a row in the width direction of the metal strip plate to inject the coolant; a supply line for supplying the coolant to each of the injection nozzles; A header that houses a plurality of the injection nozzles; a sliding member configured to selectively block or open the supply line within the header, the sliding member being any one of a cylinder having one or more protrusions, a cylinder having one or more holes, and a ring-shaped plate movable in the plate width direction; a drive unit that adjusts the amount of coolant sprayed from each of the plurality of spray nozzles by moving the sliding member; A rolling mill characterized by:

2. 2. The rolling mill according to claim 1, The sliding member is divided into two parts, a driving side and a working side. A rolling mill characterized by:

3. 2. The rolling mill according to claim 1, a shape detector disposed on an outlet side of the rolling mill and detecting a plate shape of the metal strip; and a control unit that controls the operation of the drive unit to move the sliding member so as to correct a shape defect caused by local elongation or tension based on the plate shape detected by the shape detector. A rolling mill characterized by:

4. 4. The rolling mill according to claim 3, The control unit is The injection amount of the injection nozzle at the same position in the sheet width direction as the portion where the sheet shape is locally stretched is reduced or set to zero, and / or the injection amount of the other injection nozzles is increased, or The injection amount of the injection nozzle at the same position in the sheet width direction as the portion where the sheet shape is locally elongated is increased, and / or the injection amount of the other injection nozzles is decreased or set to zero. A rolling mill characterized by:

5. The rolling mill according to any one of claims 1 to 4, The rolling mill comprises: a four-high rolling mill having the pair of work rolls and a pair of backup rolls supporting the work rolls; a six-high rolling mill having the pair of work rolls, a pair of intermediate rolls supporting the work rolls, and a pair of backup rolls supporting the intermediate rolls; an 18-high rolling mill having the pair of work rolls, a pair of intermediate rolls supporting the work rolls, a pair of backup rolls supporting the intermediate rolls, four pairs of support rolls supporting the pair of work rolls in a horizontal direction, and eight pairs of support bearings supporting the four pairs of support rolls; a 12-high rolling mill having one pair of work rolls, two pairs of intermediate rolls supporting said work rolls, and three pairs of split backing bearing shafts supporting said intermediate rolls; A 20-high rolling mill having one pair of work rolls, two pairs of first intermediate rolls supporting the work rolls, three pairs of second intermediate rolls supporting the first intermediate rolls, and four pairs of split backing bearing shafts supporting the second intermediate rolls. Either A rolling mill characterized by:

6. A tandem rolling mill having multiple rolling mill stands arranged in a row, At least one stand among a plurality of stands is provided with the rolling mill according to any one of claims 1 to 4. A tandem rolling mill characterized by:

7. A coolant supply mechanism that sprays coolant for cooling a work roll of a rolling mill, a plurality of injection nozzles arranged in a row in the width direction of the metal strip to inject the coolant; a supply line for supplying the coolant to each of the injection nozzles; A header that houses a plurality of the injection nozzles; a sliding member configured to selectively block or open the supply line within the header, the sliding member being any one of a cylinder having one or more protrusions, a cylinder having one or more holes, and a ring-shaped plate movable in the plate width direction; a drive unit that adjusts the amount of coolant sprayed from each of the plurality of spray nozzles by moving the sliding member; A coolant supply mechanism for a rolling mill comprising:

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