JP5940941B2 - Hot rolled steel plate manufacturing equipment - Google Patents

Description

  The present invention relates to a production facility for hot-rolled steel sheets.

  In rolling hot-rolled steel sheets, rolling conditions such as rolling force and rolling speed by a rolling mill, cooling conditions such as cooling power and cooling speed by a cooling device, etc. affect the characteristics of the hot-rolled steel sheets to be produced. That is, the composition of the hot-rolled steel sheet that is the material to be rolled can be changed by changing the setting conditions of the rolling mill, the cooling device, and the like.

For example, immediately after rolling a hot-rolled steel sheet under a high pressure of 20% or more from the latter stage to the final stage of a finish rolling mill of a hot rolling facility, when the hot-rolled steel sheet is rapidly cooled by a cooling device, the added amount of alloy elements is increased. It is possible to produce a high-strength steel sheet with a small number of crystal grains. For cooling in this fine grain steel manufacturing method, it is necessary to inject cooling water onto the material to be rolled at a high water density of 10 [m ³ / min · m ² ] or more immediately after rolling under high pressure. For example, it is known that a high-strength steel sheet with refined crystal grains can be obtained by starting cooling within 0.2 seconds after rolling (Non-patent Document 1).

As a cooling device in the production of the high-strength steel sheet, a large diameter capable of supplying a large amount of cooling water so that the cooling water can be injected at a high water density of 10 [m ³ / min · m ² ] or more. On the other hand, it is necessary to reduce the size to such an extent that it can be installed immediately near the exit side in the sheet feeding direction of the rolling mill so that it can be cooled immediately after rolling.

  In the production of the high-strength steel sheet, since the work roll is rolled under a high pressure of 20% or more from the latter stage to the last stage of the finish rolling mill of the hot rolling equipment, the work roll undergoes elastic deformation and is rolled. The flatness of the material decreases. A material to be rolled with a low flatness is not only uniformly cooled, but also causes breakage or the like and may cause unstable operation. Operational instability frequently results in long line stops and reduces productivity. However, even if a line stop occurs due to a plate break, the stop time can be shortened by facilitating operations around the rolling mill such as discharging the broken plate. It is necessary to improve workability by ensuring a wide work space on the work roll passing direction side.

  In addition, use under high pressure accelerates deterioration such as wear of the work roll as compared with the prior art. Since the work roll replacement cycle is shortened, the work roll replacement frequency increases. Decreasing workability such as work roll replacement increases line stop time. Therefore, in a device that cools immediately after rolling, a mechanism that does not lower the workability of roll reassignment is necessary.

Japanese Patent No. 4436142 JP 2012-66266 A

Iron and Steel Society Exhibited Literature 125th Rolling Theoretical Subcommittee "Development of Super Fine Grain Hot Rolled Steel Sheet Technology SSMR Method and Its Material Properties"

  For example, Patent Document 1 discloses a technology related to a cooling device that can secure a work space. This includes an upper cooler provided with an injection port in a swivel tube that rotates around a water supply tube through which cooling water flows, and a lower cooler provided with an injection port that is fixed to a base and injects cooling water. A cooling device comprising: According to this, since the upper cooler of the cooling device can be greatly opened upward, operations such as repair of the rolling mill and the cooling device can be easily performed.

  However, since the cooling water supplied to the swirl tube is jetted from an injection port formed in the middle of the swirl tube while flowing from one end connected to the water supply tube to the other end of the tip, the swirl tube The flow rate of the injected cooling water is different between the jet port near one end side and the jet port near the other end side of the body. That is, it is difficult to uniformly distribute the cooling water injection flow rate in the plate width direction, and control is not possible. Moreover, it is a large apparatus installed in a position away from the rolling mill, and cooling immediately after rolling and cooling with a large flow rate of cooling water are not considered. It is difficult to install this device in the immediate vicinity of the rolling mill.

  For example, Patent Document 2 discloses a technique related to a cooling device installed in the vicinity of the exit side of the rolling mill in the sheet passing direction. This is a cooling device provided with a sliding mechanism by a hydraulic cylinder so that the stripper guide can follow the change in the diameter of the work roll, and injecting cooling water onto the material to be rolled. According to this, since the cooling water is directly sprayed onto the material to be rolled from a large number of nozzles located in the vicinity of the exit side in the sheet passing direction of the rolling mill, the material to be rolled can be rapidly cooled immediately after rolling.

However, since the cooling device has been downsized so that it can be installed in the immediate vicinity of the exit side in the sheet feeding direction in the rolling mill, the range in which the cooling water is sprayed onto the material to be rolled is narrow. Accordingly, the material to be rolled when the sheet passing speed is high is injected with cooling water only for a short time. That is, in the manufacturing facility provided with the downsized cooling device of Patent Document 2, even if the cooling water is injected from the cooling device at a high water density of 10 [m ³ / min · m ² ] or more as described above. The material to be rolled cannot be cooled sufficiently.

  The present invention has been made in view of the above problems, and aims to rapidly and sufficiently cool a hot-rolled steel sheet immediately after rolling while not reducing work efficiency such as operation and repair.

  A cooling device according to a first aspect of the present invention for solving the above-mentioned problems is a heat provided with a rolling mill for rolling a material to be rolled, and a cooling facility for injecting cooling water to the material to be rolled that has been rolled by the rolling mill. It is a production facility for rolled steel sheets, and the cooling facility includes a cooling device installed in a pair of upper and lower sides with respect to the material to be rolled on the outlet side in a sheet passing direction in a work roll of the rolling mill, and a passage in the cooling device. And a succeeding cooling device installed in a pair of upper and lower sides with respect to the material to be rolled in the immediate vicinity of the plate direction outlet side, and the upper cooler and the lower cooler in the cooling device individually in the plate passing direction. It is movable, The upper cooler in the said subsequent cooling device can be rotated upward with respect to a pass line independently of the lower cooler in the said subsequent cooling device.

  A cooling device according to a second aspect of the present invention for solving the above-mentioned problem is a heat provided with a rolling mill for rolling the material to be rolled, and a cooling facility for injecting cooling water to the material to be rolled that has been rolled by the rolling mill. A manufacturing facility for rolled steel sheets, wherein the cooling facility is a first cooling device that is installed in a pair in a vertical direction with respect to the material to be rolled in the immediate vicinity of the sheet-passing direction exit side in the work roll of the rolling mill, A second cooling device that is installed in a pair of upper and lower sides with respect to the material to be rolled in the immediate vicinity of the passing direction in the first cooling device, and in the immediate vicinity of the passing direction in the second cooling device and the above A third cooling device installed in a pair of upper and lower with respect to the material to be rolled, and the upper and lower coolers in the first cooling device are individually movable in the plate passing direction. An upper cooler and a lower side in the second cooling device The rejecters are individually movable in the plate passing direction, and the upper cooler in the third cooling device is upward with respect to the pass line independently of the lower cooler in the third cooling device. It is characterized by being able to turn to the right.

The cooling device according to a third invention for solving the above-mentioned problems is the cooling device according to the second invention, wherein the upper cooler in the first cooling device is the upper cooler in the second cooling device, and and the lower cooler lower cooler in the second cooling device in one of the cooling devices are connected respectively via an elastic member, the upper cooler in the first cooling device the second cooling With respect to the upper cooler in the apparatus, the lower cooler in the first cooling apparatus is movable in the plate passing direction with respect to the lower cooler in the second cooling apparatus, and the second cooler The upper cooler and the lower cooler in the cooling device are connected to the housing of the rolling mill via an expansion / contraction member different from the expansion / contraction member, and are movable in the plate passing direction with respect to the housing. To

  The cooling device according to a fourth invention for solving the above-mentioned problems is the cooling device according to the second or third invention, wherein the upper cooler in the third cooling device is in the vicinity of the rolling mill via a frame member. It is connected with the rotating shaft member installed in this.

A cooling device according to a fifth invention for solving the above-mentioned problems is the cooling device according to the fourth invention, wherein the rotary shaft member flows a cooling water supplied to an upper cooler of the third cooling device. A pivot joint that is pivotable with a part of the main pipe and the frame member and the upper cooler of the third cooling device, and communicates with the main pipe. A branch pipe that rotates in connection with the rotating portion of the main pipe is provided .

  A cooling device according to a sixth invention for solving the above-mentioned problems is characterized in that, in the cooling device according to the fifth invention, a control valve for controlling the flow rate of the cooling water is provided in the branch pipe.

  A cooling device according to a seventh invention for solving the above-mentioned problems is the cooling device according to any one of the second to sixth inventions, wherein the first cooling device, the second cooling device, and the third cooling device. A plurality of nozzles that inject cooling water in at least one of the cooling devices are provided with on-off valves that can individually control the opening and closing of water passages that supply the cooling water.

  A cooling device according to an eighth invention for solving the above-mentioned problems is the cooling device according to the seventh invention, wherein the third cooling device is a nozzle header having the nozzle, and a detachable pin coupled to the nozzle header. And a flexible plate guide.

According to the production facility for hot-rolled steel sheets according to the first invention, the cooling device and the subsequent cooling device are provided with a cooling device and a subsequent cooling device. It can be set by cooling capacity and installation position. By downsizing the cooling device to some extent, it can be installed on the exit side in the sheet feed direction of the work roll of the rolling mill, so that the material to be rolled can be cooled. In addition, by setting the subsequent cooling device as close as possible to the exit side in the sheet passing direction in the cooling device, the subsequent cooling device is installed at a position away from the work roll of the rolling mill with less space restrictions by peripheral equipment. The subsequent cooling device can be enlarged. Therefore, the subsequent cooling device can have sufficient cooling capacity, and the material to be rolled can be sufficiently cooled.
Further, by installing the cooling device and the subsequent cooling device on the outlet side in the sheet feed direction of the work roll of the rolling mill, the material to be rolled can be continuously cooled immediately after rolling and lowered to a sufficient temperature. Therefore, cooling can be started within 0.2 seconds after rolling, and a high-strength steel plate with refined crystal grains can be produced.
Further, by rotating the upper cooler of the subsequent cooling device upward with respect to the pass line, it is possible to widen the gap with the fixed lower cooler, so that various operations can be performed. Space can be secured. Therefore, work such as repair can be easily performed. Even when a pinch roll device or the like is installed in the immediate vicinity of the outlet side in the subsequent cooling device, the upper cooler of the subsequent cooling device is rotated upward with respect to the pass line. The above-described space can be ensured without interference between the cooling device and the pinch roll device. Further, by rotating the upper cooler of the subsequent cooling device upward with respect to the pass line, a space for moving or taking out the cooling device to the exit side in the plate direction can be secured. Therefore, the cooling device can be taken out to the plate direction exit side, and work such as repair of the cooling device can be facilitated.

According to the production facility for hot-rolled steel sheets according to the second invention, the first cooling device, the second cooling device, the cooling device provided with the third cooling device, the first cooling device, The second cooling device and the third cooling device can be set with the size, cooling capacity, and installation position suitable for each application. By downsizing the first cooling device, the first cooling device can be installed in the immediate vicinity of the exit side in the sheet feeding direction in the work roll of the rolling mill, so that the material to be rolled is cooled immediately after rolling. Can do. In addition, by reducing the size of the second cooling device to some extent, it can be installed in the immediate vicinity of the sheet-passing direction exit side in the first cooling device, so that the material to be rolled is cooled following the first cooling device. You can continue. Furthermore, by setting the installation position of the third cooling device in the immediate vicinity of the exit side in the sheet passing direction in the second cooling device, the third cooling device can be removed from the work roll of the rolling mill with less space restrictions by peripheral devices or the like. Since it can install in a distant position, a 3rd cooling device can be enlarged. Therefore, the third cooling device can have sufficient cooling capacity, and the material to be rolled can be sufficiently cooled.
Moreover, by continuously installing the first cooling device, the second cooling device, and the third cooling device on the exit side in the sheet feed direction of the work roll of the rolling mill, the material to be rolled is continuously cooled immediately after rolling. It can be lowered to a sufficient temperature. Therefore, cooling can be started within 0.2 seconds after rolling, and a high-strength steel plate with refined crystal grains can be produced.
In addition, by rotating the upper cooler of the third cooling device upward with respect to the pass line, it is possible to widen the gap with the fixed lower cooler, so that various operations are performed. Space can be secured. Therefore, work such as repair can be easily performed. In addition, even when a pinch roll device or the like is installed in the immediate vicinity of the outlet side in the third cooling device, the upper cooler of the third cooling device is rotated upward with respect to the pass line. The above-described space can be ensured without interference between the third cooling device and the pinch roll device. Further, by rotating the upper cooler of the third cooling device upward with respect to the pass line, the first cooling device and the second cooling device are moved to or taken out from the plate direction. Space can be secured. Accordingly, the first cooling device and the second cooling device can be taken out to the plate-side exit side, and work such as repair of the first cooling device and the second cooling device can be facilitated.

  According to the hot rolled steel sheet manufacturing facility according to the third aspect of the invention, the upper cooler and the lower cooler in the first cooling device pass through the upper cooler and the lower cooler in the second cooling device. Since the upper cooler and the lower cooler in the second cooling device are movable in the plate passing direction with respect to the rolling mill housing, the upper cooler and the lower cooler in the first cooling device The upper cooler and lower cooler in the side cooler and the second cooling device can be individually moved, and the position can be finely adjusted following changes in the diameter and inclination of the work roll of the rolling mill. Can do. Further, the upper cooler and the lower cooler in the first cooling device and the upper cooler and the lower cooler in the second cooling device are connected to each other via an expansion member, and the upper cooler in the second cooling device. In addition, since the lower cooler and the housing of the rolling mill are connected via an expansion / contraction member different from the expansion / contraction member, a simple structure can be achieved.

  According to the hot-rolled steel sheet manufacturing facility according to the fourth aspect of the invention, the upper cooler in the third cooling device can be rotated upward with respect to the pass line around the rotating shaft member installed in the vicinity of the rolling mill. Therefore, the upper cooler in the third cooling device can be greatly opened with respect to the lower cooler. Further, by rotating the frame member loaded with a plurality of header control valves about the main pipe, moment force acts on the frame member when the upper cooler in the third cooling device is rotated. In the upper cooler in the apparatus, the strength and rigidity of the frame can be lowered by arranging the control valve as a balancer on the opposite side of the frame member and arranging the center of gravity of the swing member in the vicinity of the rotation axis. Therefore, the manufacturing cost and size of the upper cooler in the third cooling device can be suppressed.

  According to the hot-rolled steel sheet manufacturing facility according to the fifth aspect of the present invention, the number of devices to be installed can be reduced by using the main pipe through which the cooling water supplied to the third cooling device is supplied to the rotating shaft member. The manufacturing cost and size of the entire manufacturing equipment can be reduced.

  According to the hot-rolled steel sheet manufacturing facility according to the sixth aspect of the invention, the control valve for controlling the flow rate of the cooling water is provided in the branch pipe installed between the main pipe installed in the vicinity of the rolling mill and the third cooling device. Therefore, since the flow rate of the cooling water can be controlled at a position close to the injection port for injecting the cooling water, the time taken from when the control valve is operated until the injection flow rate of the cooling water at the injection port is controlled. short. Therefore, since the cooling water injection flow rate can be quickly controlled, it is possible to switch between fine settings such as cooling conditions and quick settings.

  According to the hot-rolled steel sheet manufacturing facility according to the seventh aspect of the invention, water is opened and closed at a large number of nozzles in at least one of the first cooling device, the second cooling device, and the third cooling device. By providing an on-off valve that can be individually controlled, the header can be filled with cooling water at all times, so that it can be injected at a predetermined pressure, so that high responsiveness can be realized. Moreover, since the water hammer force can be lowered, the strength and rigidity of the frame member can be kept low.

  According to the production facility for hot-rolled steel sheets according to the eighth aspect of the invention, since the header unit and the downstream passage guide in the third cooling device are pin-coupled so that they can be easily attached and detached, Operations such as repair and header unit replacement can be easily performed.

It is a side view which shows the manufacturing equipment of the hot rolled sheet steel which concerns on Example 1. FIG. It is a sectional side view which shows the manufacturing equipment of the hot rolled sheet steel which concerns on Example 1. FIG. It is a top view which shows the manufacturing equipment of the hot rolled sheet steel which concerns on Example 1. FIG. It is a cross-sectional view (IV arrow sectional drawing in FIG. 2) which shows engagement with the 1st cooling device in the manufacturing equipment of the hot-rolled steel plate which concerns on Example 1, and a 2nd cooling device, and a housing. It is a cross-sectional view which shows the cooling position of the 3rd cooling device in the manufacturing equipment of the hot-rolled steel plate which concerns on Example 1. FIG. It is a cross-sectional view showing the retracted position of the third cooling device in the hot-rolled steel sheet manufacturing facility according to Example 1. It is explanatory drawing which shows the on-off valve of the closed state of the 3rd cooling device in the manufacturing equipment of the hot-rolled steel plate which concerns on Example 1. FIG. It is explanatory drawing which shows the on-off valve of the state which the 3rd cooling device opened in the manufacturing equipment of the hot-rolled steel plate which concerns on Example 1. FIG.

  Below, the Example of the manufacturing equipment of the hot rolled sheet steel which concerns on this invention is described in detail with reference to an accompanying drawing. Needless to say, the present invention is not limited to the following examples, and various modifications can be made without departing from the spirit of the present invention.

  The configuration of the hot-rolled steel sheet manufacturing facility according to the present embodiment will be described with reference to FIGS. 1 to 6A and 6B.

  As shown in FIG. 2, the production facility for hot-rolled steel sheets according to this example rolls a strip 1 that is a material to be rolled by a rolling mill 2, and the strip plate 1 in the rolling mill 2 exits in the sheet feeding direction ( It cools with the cooling equipment 3 installed in the downstream (left side in the figure). In addition, the strip 1 after rolling by the rolling mill 2 is tensioned by a pinch roll device 4 installed on the downstream side of the cooling facility 3 so as not to bend due to its own weight or the like. Guide of the plate to the pinch roll device 4 of the band plate 1 is performed by a side guide 5 installed on the upstream side of the pinch roll device 4.

  The rolling mill 2 is installed at the final stage in the hot rolling facility, and a pair of upper and lower work rolls 10 for rolling the strip 1, a pair of upper and lower backup rolls 20 for supporting the work roll 10, the work roll 10 and the backup roll. And a housing 30 covering 20. Of course, the cooling equipment 3 is not limited to the rolling mill 2 at the final stage as in the present embodiment, and the production of a hot-rolled steel sheet in which the cooling equipment 3 is installed on the exit side in the sheet passing direction of the rolling mill installed at other than the final stage. It is good as facilities.

  The cooling facility 3 is a water-injection type cooling facility that injects cooling water to cool the strip 1, and a pair of upper and lower first cooling devices 40 a that are installed downstream of the work roll 10 in the rolling mill 2. , 40b, a pair of upper and lower second cooling devices 50a and 50b, and a pair of upper and lower third cooling devices 60a and 60b.

  As shown in FIG. 1, the first cooling devices 40 a and 40 b are installed in a pair of upper and lower sides with respect to the band plate 1 inside the housing 30 adjacent to the downstream side of the work roll 10. Stripper guides 41a and 41b that come into contact with the work roll 10 and first nozzle headers 42a and 42b to which a number of nozzles 70 that inject cooling water onto the belt plate 1 are attached. In the first cooling zone A, the material to be rolled 1 is cooled. The upper cooler 40a of the first cooling device and the lower cooler 40b of the first cooling device can be slid independently in the plate passing direction. The work roll 10 is inclined and has a guide structure capable of following movement in the body length direction.

  The second cooling devices 50a and 50b are installed in a pair of upper and lower sides with respect to the strip 1 adjacent to the downstream side of the first cooling devices 40a and 40b, and guide the strip 1 so that the strip 1 is correctly passed. It has 2nd nozzle headers 52a and 52b which attached many nozzles 70 which inject | pour the plate guides 51a and 51b and the cooling water into the strip 1, and cools the to-be-rolled material 1 in the 2nd cooling zone B. . The upper cooler 50a of the second cooling device and the lower cooler 50b of the second cooling device can slide independently in the plate passing direction. The first cooling devices 40a and 40b are installed in a nested structure in the second cooling devices 50a and 50b.

  The third cooling devices 60a and 60b are installed in a pair of upper and lower sides with respect to the band plate 1 outside the housing 30 adjacent to the downstream side of the second cooling devices 50a and 50b, and the band plate 1 is correctly passed. And the third nozzle headers 62a and 62b to which a large number of nozzles 70 for injecting cooling water onto the strip plate 1 are attached. Cool down. The upper cooler 60a of the third cooling device is rotatable upward with respect to the pass line, and the lower cooler 60b of the third cooling device is fixed to a gantry not shown.

  As shown in FIG. 4, guide protrusions 43 a and 53 a provided on the side surface of the upper cooler 40 a of the first cooling device and the side surface of the upper cooler 50 a of the second cooling device in the width direction of the strip 1 are provided. The upper cooler 40a of the first cooling device and the upper cooler 50a of the second cooling device are engaged with the guide rail 31 provided in the housing 30 and are slidable in the plate passing direction with respect to the housing 30. ing. Similarly, the lower cooler 40 b of the first cooling device and the lower cooler 50 b of the second cooling device are installed to be slidable in the plate passing direction with respect to the housing 30.

  As shown in FIG. 1, first hydraulic cylinders 80a and 80b and second hydraulic cylinders 90a and 90b are attached to the second cooling devices 50a and 50b. The front ends of the first hydraulic cylinders 80a and 80b are connected to the first cooling devices 40a and 40b by engagement pins (not shown). The distal ends of the second hydraulic cylinders 90a and 90b are connected to the housing 30 by engagement pins (not shown).

  When the first hydraulic cylinders 80a and 80b are contracted, the first cooling devices 40a and 40b have guide protrusions 43a and 43b of the first cooling devices 40a and 40b along the guide rails 31 of the housing 30 (FIG. 4). See), and slides downstream so as to approach the second cooling devices 50a and 50b. On the other hand, when the first hydraulic cylinders 80a and 80b are extended, the first cooling devices 40a and 40b have the guide protrusions 43a and 43b of the first cooling devices 40a and 40b along the guide rails 31 of the housing 30 ( 4) and slides to the upstream side (passing plate direction entry side) away from the second cooling devices 50a and 50b. Of course, the first hydraulic cylinders 80a and 80b extend and contract independently, and the first cooling devices 40a and 40b can slide independently.

  When the second hydraulic cylinders 90a and 90b are contracted, the second cooling devices 50a and 50b are such that the guide protrusions 53a and 53b of the second cooling devices 50a and 50b extend along the guide rail 31 of the housing 30 (FIG. 4). See), and slides upstream so as to approach the housing 30. On the other hand, when the second hydraulic cylinders 90a and 90b are extended, the second cooling devices 50a and 50b have the guide protrusions 53a and 53b of the second cooling devices 50a and 50b along the guide rails 31 of the housing 30 ( 4) and slides downstream from the housing 30. Of course, the second hydraulic cylinders 90a and 90b extend and contract independently, and the second cooling devices 50a and 50b can slide independently.

  The operation source in the sliding mechanism of the first cooling devices 40a and 40b and the second cooling devices 50a and 50b is not limited to the hydraulic cylinder of the present embodiment. For example, the first cooling devices 40a and 40b and the second cooling devices 40a and 50b The cooling devices 50a and 50b may be slid with an air cylinder, or a rack and pinion may be provided and slid with an electric motor or the like. However, in an environment where a large amount of cooling water is used, it is necessary to consider the increase in driving friction due to lack of lubricating oil and damage due to oxidation of metal parts. It is preferable.

  Since the first cooling devices 40a and 40b can be slid to the upstream side by the first hydraulic cylinders 80a and 80b, the stripper guides 41a and 41b of the first cooling devices 40a and 40b are inclined by the diameter of the work roll 10 It is possible to make contact with each other following the change in the angle. Therefore, in order to prevent the strip 1 from being wound around the outer peripheral surface of the work roll 10, the strip 1 is peeled off from the outer peripheral surface of the work roll 10 by the stripper guides 41a and 41b that come into contact with the work roll 10. Is done. Moreover, since the 1st cooling device 40a, 40b is located in the immediate vicinity of the work roll 10, the cooling immediately after rolling of the strip 1 can be started earlier.

  Since the first cooling devices 40a and 40b and the second cooling devices 50a and 50b can be slid downstream by the first hydraulic cylinders 80a and 80b, the space near the work roll 10 can be expanded. Therefore, work such as repair can be easily performed.

  Further, by removing an engagement pin (not shown) that connects the second hydraulic cylinders 90a, 90b and the housing 30, the first cooling devices 40a, 40b and the second cooling devices 50a, 50b are integrated (first And can be detached from the housing 30 in a state of being connected via one hydraulic cylinder 80a, 80b. By simply attaching and detaching the engagement pins (not shown), the first cooling devices 40a and 40b and the second cooling devices 50a and 50b can be easily assembled and detached from the housing 30.

  Of course, the first cooling devices 40a and 40b and the second cooling device are removed with the engagement pins (not shown) connecting the first hydraulic cylinders 80a and 80b and the first cooling devices 40a and 40b removed. 50a and 50b may be separately assembled and removed from the housing 30.

  As shown in FIG. 3, the main pipe 100 for supplying cooling water to the cooling facility 3 is disposed adjacent to the rolling mill 2 along the sheet passing direction. The main pipe 100 is provided with a rotary joint 102 that is a rotatable joint and a rotation support base 103 that is a rotary bearing, and a part of the main pipe 100 (rotating portion 101) is rotatable. Further, the frame member 110 for attaching the upper cooler 60a of the third cooling device is connected to the rotating portion 101 of the rotatable main pipe 100, and together with the rotating portion 101 of the main pipe 100, the frame member 110 and the third cooling device. The upper cooler 60a is rotatable.

  As shown in FIGS. 5A and 5B, in this embodiment, a rotating hydraulic cylinder 150 is attached to an arm portion 104 provided in the rotating portion 101. The rotating portion 101 and the frame member 110 can be rotated by the expansion and contraction operation of the rotating hydraulic cylinder 150. When the rotating hydraulic cylinder 150 is contracted, the frame member 110 together with the rotating portion 101 rotates upward so as to be separated from the strip 1 and is positioned at the retracted position (position in FIG. 5B). When the rotating hydraulic cylinder 150 is extended, the frame member 110 together with the rotating portion 101 rotates downward so as to approach the strip 1 and is positioned at the cooling position (position in FIG. 5A).

  In addition, when the rotary hydraulic cylinder 150 is extended and the frame member 110 is positioned at the cooling position, an impact reducing member (not shown) is installed so as to reduce the impact. The impact relaxation member is preferably an elastic body that can absorb shocks such as a coil spring, rubber spring, and urethane rubber so as to come into contact with the frame member 110 at the cooling position.

  In this embodiment, the stopper member 111 is provided so that the frame member 110 is accurately positioned at the cooling position. As the stopper member 111, it is preferable that the distance between the nozzle 70 and the strip 1 in the upper cooler 60a of the third cooling device can be adjusted so as to comply with various cooling conditions. For example, the nozzle 70 in the upper cooler 60a of the third cooling device is provided by providing a distance adjustment slope on the frame member 110 and the stopper member 111 and changing the contact position of the distance adjustment slope by an expansion and contraction operation of a hydraulic cylinder or the like. The distance between the belt plate 1 and the belt plate 1 can be adjusted.

  The rotation operation mechanism of the rotation unit 101 is not limited to the present embodiment. For example, the rotary hydraulic cylinder 150 is directly connected to the frame member 110 between the rotary unit 101 and the third cooling devices 60a and 60b, and the frame member 110 is pulled up by contraction of the rotary hydraulic cylinder 150, or the rotary hydraulic cylinder The frame member 110 may be rotated together with the rotating unit 101 so as to push up the frame member 110 by extending 150, or may be rotated using an electric motor or the like.

  In the upper cooler 60a of the third cooling device, a water storage section 120 divided into a plurality (10 in this embodiment) is formed. As shown in FIG. 5A, the water reservoir 120 has an opening 121 for attaching the nozzle header 62a.

  A seal member 130 is provided in the opening 121 so that cooling water can be prevented from leaking when the nozzle header 62a is attached. The seal member 130 has a simple structure that seals the attachment gap between the opening 121 and the nozzle header 62a under the pressure of the cooling water supplied to the water storage unit 120. Therefore, the nozzle header 62a is easily attached and detached with a structure that is sandwiched and fixed between the frame members 110, and the work efficiency such as replacement of the nozzle header 62a is good.

  In addition, on the plurality of nozzles 70 for injecting cooling water in the third cooling devices 60a and 60b, on-off valves 140 (FIGS. 6A and 6B) for switching between the start and stop of the cooling water flow using the control fluid. Reference) is installed. As shown in FIGS. 6A and 6B, the on-off valve 140 includes an inner member 142 provided with a cooling water passage hole 141 and an outer member 143 that grips the inner member 142 slidably only in one direction.

  By flowing a control fluid between the inner member 142 and the outer member 143, the inner member 142 slides with respect to the outer member 143, and the water passage hole 141 is closed (FIG. 6A). By discharging the control fluid poured between the inner member 142 and the outer member 143, the inner member 142 slides with respect to the outer member 143 to open the water passage hole 141 (FIG. 6B). The on-off valves 140 provided on the plurality of nozzles 70 of the third cooling devices 60a and 60b can be individually controlled.

  A branch pipe 160 independent of the frame member 110 is installed so as to connect the water storage unit 120 and the rotation unit 101. The branch pipe 160 is rotatably supported by the rotating portion 101 in the same manner as the frame member 110. The cooling water is supplied to the water storage unit 120 through the branch pipe 160 and is injected in the upper cooler 60a of the third cooling device. The first cooling devices 40a and 40b, the second cooling devices 50a and 50b, and the lower cooling device 60b of the third cooling device receive cooling water via a branch pipe (not shown) separate from the branch pipe 160. Supplied.

  The branch pipe 160 is provided with a flow rate adjusting valve 170 to adjust the flow rate of the cooling water flowing through the branch pipe 160. The flow rate adjusting valve 170 installed in the branch pipe 160 is positioned in the vicinity of the upper cooler 60a of the third cooling device. After adjusting the flow rate adjusting valve 170, the upper cooler 60a of the third cooling device. It is possible to shorten the time taken until the cooling water injection flow rate is controlled. That is, the injection flow rate of the cooling water in the upper cooler 60a of the third cooling device can be quickly controlled.

  The flow rate adjustment valve 170 also serves as a balancer in the rotation operation mechanism of the rotation unit 101. As shown in FIG. 5A, the flow rate adjustment is performed so that the center of gravity of the device rotating together with the rotating unit 101 including the frame member 110, the branch pipe 160, the flow rate adjusting valve 170, and the like approaches the rotation center 101c that is the axis of the rotating unit 101. A valve 170 is installed. That is, the flow rate adjustment valve 170 is installed at a position where a moment opposite to the moment applied to the rotating unit 101 due to the mass of the frame member 110 or the like is applied to the rotating unit 101.

  Since the flow rate adjusting valve 170 and the frame member 110 are installed at positions where opposite moments are applied to the rotating unit 101, the flow adjusting valve 170 and the frame member 110 of the device that rotates together with the rotating unit 101 including the flow rate adjusting valve 170 and the frame member 110, etc. The center of gravity approaches the rotation center 101c. Therefore, the force required to rotate the flow rate adjustment valve 170 and the frame member 110 can be suppressed. Further, since the force applied to the flow rate adjusting valve 170 and the frame member 110 is also small, enlarging the flow rate adjusting valve 170 and the frame member 110 can be suppressed in order to have high strength and high rigidity.

  Of course, the installation position of the flow regulating valve 170 is not limited to this embodiment, and may be a position close to the upper cooler 60a of the third cooling device. As in this embodiment, when the flow rate adjustment valve 170 is increased to control a large flow rate of cooling water, the flow rate adjustment valve 170 is heavy, so that the center of gravity of the device rotating together with the rotating unit 101 rotates. It is preferable to install the flow rate adjustment valve 170 so as to approach the center 101c. In addition, it is preferable to attach an auxiliary member that supports the flow rate adjusting valve 170 so that the flow rate adjusting valve 170 is not damaged when the rotary operation is performed.

  Next, the operation of the hot-rolled steel sheet manufacturing facility according to the present embodiment will be described with reference to FIGS. 1 to 3 and FIG. 5A.

  First, before operating the rolling mill 2 and the cooling facility 3, the main plug (not shown) of the main pipe 100 is slowly opened to fill the main pipe 100 with cooling water (see FIG. 3), and the flow rate adjustment valve 170 provided in the branch pipe 160 is provided. Is slowly opened to fill the branch pipe 160 and the water reservoir 120 of the frame member 110 with cooling water (see FIG. 5A). By adjusting the opening / closing speed of the main plug (not shown) of the main pipe 100 and the flow rate adjustment valve 170 of the branch pipe 160, the water impact when the cooling water changes the water flow rate can be minimized.

  Next, the rolling mill 2 is operated, the flow rate of the cooling water by the flow rate adjustment valve 170 is adjusted so as to comply with a predetermined cooling condition, and the on-off valve 140 is opened / closed according to the predetermined cooling condition. As shown in FIG. 2, the strip 1 is rolled by a pair of upper and lower work rolls 10 in a rolling mill 2 and is tensioned by a pinch roll device 4. Therefore, the belt plate 1 is cooled by receiving the cooling water from the cooling facility 3 without being bent between the work roll 10 and the pinch roll device 4.

  First, in the first cooling zone A, the strip 1 is cooled by the first cooling devices 40a and 40b immediately after being rolled by the work roll 10 in the rolling mill 2 (in this embodiment, within 0.2 seconds after rolling). The Next, in the second cooling zone B, the strip 1 is further cooled by the second cooling devices 50a and 50b without leaving the cooling by the first cooling devices 40a and 40b. Next, in the third cooling zone C, the strip 1 is sufficiently cooled by the third cooling devices 60a and 60b.

  By forming the first cooling devices 40a and 40b with a simple structure and reducing the size, the stripper guides 41a and 41b are brought closer to the exit side in the sheet feeding direction of the rolling mill 2 so as to come into contact with the work roll 10. The cooling devices 40a and 40b can be arranged, and cooling of the strip 1 can be started immediately after rolling. Therefore, it is possible to manufacture a high-strength steel sheet with a small amount of alloy elements added and crystal grains refined.

  Further, as shown in FIG. 1, the first cooling device 40a, 40b is connected to the second cooling device 50a, 50b via the first hydraulic cylinders 80a, 80b, whereby the first cooling device 40a. , 40b can slide in the plate-passing direction with respect to the second cooling devices 50a, 50b, and the stripper guides 41a, 41b in the first cooling devices 40a, 40b follow the change in the diameter of the work roll 10. Can be brought into contact with the work roll 10. Therefore, it can prevent that the strip 1 winds around the work roll 10 after rolling.

  By reducing the size of the second cooling devices 50a and 50b with a simple structure, the second cooling devices 50a and 50b can be arranged between the first cooling devices 40a and 40b and the third cooling devices 60a and 60b. The strip 1 can be continuously cooled even after cooling by 40b. Therefore, the strip 1 can be sufficiently cooled together with the first cooling devices 40a and 40b. In addition, the cooling capacity as the whole cooling equipment 3 can be improved by providing the 2nd cooling device 50a, 50b with a cooling capability higher than the 1st cooling device 40a, 40b. Since the second cooling devices 50a and 50b are installed not on the work roll 10 but on the downstream side of the first cooling devices 40a and 40b, the second cooling devices 50a and 50b are allowed to increase in size as the cooling capacity is improved.

  By providing the third cooling device 60a, 60b with a higher cooling capacity than the first cooling device 40a, 40b and the second cooling device 50a, 50b, the rolled strip 1 can be wound around a coil (not shown). Sufficient cooling can be performed. The third cooling devices 60a and 60b are installed not on the work roll 10 or the first cooling devices 40a and 40b but on the downstream side of the second cooling devices 50a and 50b, so that the cooling capacity is improved. Further enlargement is allowed. Further, as shown in FIG. 5A, the flow rate adjusting valve 170 and the on-off valve 140 are installed in the third cooling devices 60a and 60b so that the cooling water injection flow rate can be finely and quickly controlled. It is possible to manage the fine cooling conditions such as the cooling temperature, the cooling time, and the cooling process.

  Next, operations such as repair of a hot-rolled steel sheet manufacturing facility according to the present embodiment will be described with reference to FIGS. 1, 5A, 5B, and 6A.

  In repairing the rolling mill 2 and the cooling equipment 3 and replacing the work roll 10, the maintenance work can be facilitated by opening the cooling equipment 3 greatly.

  First, after the rolling mill 2 is stopped, the flow regulating valve 170 provided on the branch pipe 160 is closed with all the on-off valves 140 of the third cooling devices 60a and 60b closed (see FIG. 6A). The supply of cooling water to is stopped (see FIG. 5A). Next, a part or all of the on-off valve 140 is opened to discharge the cooling water remaining in the branch pipe 160 and the water storage unit 120. The supply of the cooling water to the branch pipe 160 is stopped and the cooling water in the branch pipe 160 is discharged from the on-off valve 140, thereby reducing the force required for turning.

  Next, the rotating hydraulic cylinder 150 is contracted to rotate the rotating portion 101 of the main pipe 100 together with the arm portion 104. The branch pipe 160 connected to the rotating part 101, the frame member 110, the upper cooler 60a of the third cooling device, and the like rotate upward so as to be separated from the strip 1 around the rotation center 101c that is the axis of the rotating part 101. Operates and is in the retracted position (see FIG. 5B). Therefore, a wide space is formed on the downstream side of the upper cooler 50a of the second cooling device, work such as repair of the cooling facility 3 can be easily performed, and the upper cooler 50a of the second cooling device is provided. A space that slides downstream from the housing 30 is created (see FIG. 1).

  When the upper cooling device 60a of the third cooling device is rotated upward with the passage guide 61a of the upper cooling device 60a of the third cooling device removed, the upper side of the third cooling device Since the nozzle header 62a of the cooler 60a is in an exposed state, maintenance work such as nozzle replacement in the nozzle header 62a can be performed in a wide space (see FIG. 5B).

  Next, an engagement pin (not shown) connecting the second hydraulic cylinders 90a, 90b and the housing 30 is removed, and the first cooling devices 40a, 40b and the second cooling devices 50a, 50b are integrated (first In the state of being connected via the hydraulic cylinders 80a and 80b). Since the first cooling devices 40a and 40b and the second cooling devices 50a and 50b installed in the immediate vicinity of the rolling mill 2 are removed, a wide space is created in the vicinity of the work roll 10, and the rolling mill 2 is repaired. And work such as replacement of the work roll 10 can be easily performed (see FIG. 1).

  Since only the engagement pins (not shown) are attached / detached, the first cooling devices 40a, 40b and the second cooling devices 50a, 50b can be easily attached to and detached from the housing 30. Of course, the first cooling devices 40a and 40b and the second cooling device are removed with the engagement pins (not shown) connecting the first hydraulic cylinders 80a and 80b and the first cooling devices 40a and 40b removed. You may remove 50a and 50b from the housing 30 separately.

  Further, in FIG. 2, the cooling in the first cooling zone A is not performed, and the cooling in the second cooling zone B and the third cooling zone C can be started within 0.2 seconds after rolling. In this case, the first cooling devices 40a and 40b may be omitted, and the second cooling devices 50a and 50b and the third cooling devices 60a and 60b may be present. In the case where cooling in the cooling zone B is not performed and cooling can be started within 0.2 seconds after rolling even when cooling only in the third cooling zone C, the first cooling devices 40a and 40b Even if there is no second cooling device 50a, 50b and only the third cooling device 60a, 60b is present, it is clear that the configuration is changed without departing from the gist of the present invention.

  Since the present invention can be cooled immediately after rolling, it is suitable as a production facility in hot rolling for the purpose of refining crystal grains in a steel sheet. Moreover, since cooling conditions, such as the injection flow rate of cooling water, can be quickly controlled, it is particularly suitable as a production facility in continuous casting and rolling in which the rolling conditions can be changed during rolling.

DESCRIPTION OF SYMBOLS 1 Strip 2 Rolling machine 3 Cooling equipment 4 Pinch roll device 5 Side guide 10 Work roll 20 Backup roll 30 Housing 31 Guide rail 40 First cooling device 41 Stripper guide 42 of the first cooling device Nozzle of the first cooling device Header 43 Guide protrusion 50 of the first cooling device Second cooling device 51 Passing plate guide 52 of the second cooling device Nozzle header 53 of the second cooling device Guide protrusion 60 of the second cooling device Third cooling device 61 Third plate passing plate guide 62 Third cooling device nozzle header 70 Nozzle 80 First hydraulic cylinder 90 Second hydraulic cylinder 100 Main pipe 101 Main pipe rotating section 102 Main pipe rotary joint 103 Pipe rotation support base 104 Main pipe arm part 110 Frame member 111 Stopper member 120 Water storage part 121 Water storage The opening 130 seal member 140 off valve 141 Tsusuiana 142 inner member 143 outer member 150 rotates the hydraulic cylinder 160 a branch pipe 170 branch pipes of the flow control valve

Claims (8)

A rolling mill for rolling a material to be rolled, and a manufacturing facility for hot-rolled steel sheets, comprising a cooling facility for injecting cooling water to the material to be rolled that has been rolled by the rolling mill,
The cooling equipment includes a cooling device installed in a pair of upper and lower sides with respect to the material to be rolled on the exit side in the work roll of the rolling mill, and a position near the exit side in the passage direction in the cooling device. A subsequent cooling device installed in a pair of upper and lower with respect to the rolled material,
The upper cooler and the lower cooler in the cooling device can be individually moved in the plate passing direction,
The manufacturing equipment for hot-rolled steel sheets, wherein the upper cooler in the subsequent cooling device is rotatable upward with respect to the pass line independently of the lower cooler in the subsequent cooling device. A rolling mill for rolling a material to be rolled, and a manufacturing facility for hot-rolled steel sheets, comprising a cooling facility for injecting cooling water to the material to be rolled that has been rolled by the rolling mill,
The cooling equipment includes a first cooling device that is installed in a pair of upper and lower sides with respect to the material to be rolled in the immediate vicinity of the sheet passing direction in the work roll of the rolling mill, and the sheet passing direction in the first cooling device. A second cooling device that is installed in a pair in the upper and lower directions immediately on the exit side, and a pair in the upper and lower sides on the exit side in the sheet passing direction in the second cooling device and in a pair on the upper and lower sides. A third cooling device installed,
The upper cooler and the lower cooler in the first cooling device are individually movable in the plate passing direction,
The upper cooler and the lower cooler in the second cooling device can be individually moved in the plate passing direction,
The upper cooler in the third cooling device is rotatable upward with respect to the pass line independently of the lower cooler in the third cooling device. Facility. The upper cooler in the first cooling device is an upper cooler in the second cooling device, the lower cooler in the first cooling device is a lower cooler in the second cooling device, and a telescopic member. are connected via respective,
The upper cooler in the first cooling device is for the upper cooler in the second cooling device, and the lower cooler in the first cooling device is for the lower cooler in the second cooling device. Each can be moved in the direction of threading,
The upper cooler and the lower cooler in the second cooling device are connected to the housing of the rolling mill via an expansion / contraction member different from the expansion / contraction member, and are movable in the plate passing direction with respect to the housing. The manufacturing equipment for hot-rolled steel sheets according to claim 2, wherein The hot-roller according to claim 2 or 3, wherein the upper cooler in the third cooling device is connected to a rotary shaft member installed in the vicinity of the rolling mill via a frame member. Steel plate manufacturing equipment. The rotating shaft member is provided with a rotatable joint on a main pipe through which cooling water supplied to the upper cooler of the third cooling device flows, and a part of the main pipe is provided with the frame member and the third cooling section. A rotating part that is rotatable together with the upper cooler of the device;
The equipment for producing a hot-rolled steel sheet according to claim 4 , further comprising a branch pipe that communicates with the main pipe and rotates while being connected to the rotating portion of the main pipe . The manufacturing equipment for hot-rolled steel sheets according to claim 5, wherein a control valve for controlling a flow rate of cooling water is provided in the branch pipe. Individually controlling the opening and closing of water passages for supplying cooling water to a plurality of nozzles that inject cooling water in at least one of the first cooling device, the second cooling device, and the third cooling device. The hot-rolled steel sheet manufacturing equipment according to any one of claims 2 to 6, further comprising an on-off valve capable of performing the following. The said 3rd cooling device is provided with the nozzle header which has the said nozzle, and the detachable through-plate guide pin-coupled with the said nozzle header. The manufacturing apparatus of the hot-rolled steel plate of Claim 7 characterized by the above-mentioned. .

Images