Hot continuous rolling finishing mill frame and outlet side working roll cooling device thereof

Abstract

The utility model provides a hot continuous rolling finishing mill frame and an outlet side working roll cooling device thereof, which comprise a cooling lower header mechanism, and when the cooling lower header mechanism is used for an F5 finishing mill frame, the cooling lower header mechanism comprises a first header main pipe, a first header water inlet pipe, a first header water outlet branch pipe and a nozzle head, a plurality of rows of first header water outlet branch pipes are arranged in the height direction of the first header main pipe, the first header water outlet branch pipes comprise a first upper-row water outlet branch pipe, a first middle water outlet branch pipe and a first lower-row water outlet branch pipe, the axis of a nozzle head of the first upper-row water outlet branch pipe inclines downwards, the axis of a nozzle head of the first middle water outlet branch pipe is horizontally arranged, and the axis of a nozzle head of the first lower-row water outlet branch pipe inclines downwards. And the axis of the nozzle head of the first lower-row water discharging branch pipe is upwards inclined. The working roll cooling device solves the problem that due to the fact that the spraying coverage area of the nozzles on the section of the working roll is too small, the temperature returning area between every two adjacent rows is too large, and the cooling strength of the working roll of an F5 finishing mill frame is not enough.

Description

TECHNICAL FIELD

[0001] The utility model relates to the strip rolling technical field especially, relates to a hot tandem finishing stand and its outlet side work roll cooling device. BACKGROUND

[0002] The original design of CSP process work roll cooling water has the characteristics of small cooling capacity per unit area, which corresponds to the initial product structure of the production line design. With the development of product upgrading, the production of high surface quality strip steel has become the main variety of short process. In order to cope with the production of high surface quality strip steel, various factors affecting the shedding of work roll oxide film are analyzed.

[0003] The upper and lower header pipes of the work roll cooling of the outlet side of the F5 finishing stand and the upper cooling header pipe of the F6 finishing outlet function to cool the surface of the work roll on the outlet side, ensure the cooling intensity of the surface of the lower work roll, and the temperature gradient of the surface of the cooled lower work roll. Firstly, it avoids the generation of too thick oxide film due to the too high temperature of the surface of the work roll, and further causes the uneven peeling of the oxide film on the surface of the lower work roll. Secondly, it ensures the temperature gradient of the surface of the lower work roll, and further adapts to the crown control of the CSP hot tandem finishing stand.

[0004] In the prior art, the outlet side work roll cooling lower header pipe of the F5 finishing stand has the following problems: the spray coverage area (angle) of each row of nozzles is relatively narrow, resulting in a large temperature drop during cooling of each row of nozzles, leaving a large temperature recovery zone between the adjacent two rows of nozzles, resulting in a too high temperature value conducted from the center of the upper work roll after cooling of each row of nozzles, and a too high temperature value on the surface of the work roll.

[0005] In the CSP hot tandem rolling production, due to the problems of too small spacing and too small deflection angle of the nozzles arranged on the outlet side work roll cooling lower header pipe of the stand, the spray water marks between the adjacent two nozzles are interfered, affecting the cooling effect.

[0006] The existing CSP hot tandem F5 finishing stand outlet side work roll cooling lower header pipe is provided with three rows of nozzles, and the water distribution in the thickness direction of each type of nozzle during spraying is not considered during design, resulting in that the water distribution in the length direction of the work roll body does not follow the narrowest width of the CSP hot tandem F5 finishing stand during actual production. INVENTION CONTENTS

[0007] The main purpose of the utility model is to solve the problem of insufficient cooling intensity of the F5 finishing stand work roll caused by too small spray coverage area of the nozzles on the work roll cross section, which leads to too large temperature recovery zone between the adjacent two rows.

[0008] In order to achieve the above object, the utility model provides a kind of outlet side work roll cooling device of hot continuous rolling finishing stand, including cooling lower header mechanism, when cooling lower header mechanism is used for F5 finishing stand, it includes first header main pipe, first header inlet pipe, first header outlet branch pipe and nozzle head, wherein,

[0009] The first header inlet pipe and the first header outlet branch pipe are communicated with the first header main pipe, the first header outlet branch pipe is provided with multiple rows in the height direction of the first header main pipe, the nozzle head is installed at the outlet of each first header outlet branch pipe, the first header outlet branch pipe includes a first upper outlet branch pipe, a first intermediate outlet branch pipe and a first lower outlet branch pipe, the nozzle head axis of the first upper outlet branch pipe is inclined downward, the nozzle head axis of the first intermediate outlet branch pipe is horizontal, and the nozzle head axis of the first lower outlet branch pipe is inclined upward.

[0010] Preferably, the included angle between the nozzle head axis of the first upper outlet branch pipe and the nozzle head axis of the first lower outlet branch pipe and the nozzle head axis of the first intermediate outlet branch pipe is 10-16 degrees.

[0011] Preferably, the first upper outlet branch pipe, the first intermediate outlet branch pipe and the first lower outlet branch pipe are provided with multiple first outlet units in the length direction of the header main pipe, and the outlet pipe diameter of the multiple first outlet units is thick in the middle and thin on both sides.

[0012] Preferably, the outlet side work roll cooling device of hot continuous rolling finishing stand further includes a cooling upper header mechanism, when the cooling upper header mechanism is used for F5 finishing stand, it includes a second header main pipe, a second header inlet pipe, a second header outlet branch pipe and a nozzle head, wherein,

[0013] The nozzle head is installed at the outlet of each second header outlet branch pipe, the second header outlet branch pipe includes a second upper outlet branch pipe, a second intermediate outlet branch pipe and a second lower outlet branch pipe, the nozzle head axis of the second upper outlet branch pipe is inclined downward, and the nozzle head axis of the second intermediate outlet branch pipe and the second lower outlet branch pipe is arranged towards the center direction of the work roll.

[0014] Preferably, the second upper outlet branch pipe, the second intermediate outlet branch pipe and the second lower outlet branch pipe are provided with multiple second outlet units in the length direction of the header main pipe, and the outlet pipe diameter of the multiple second outlet units is thick in the middle and thin on both sides.

[0015] Preferably, when the cooling lower header mechanism is used for F6 finishing stand, the cooling lower header mechanism includes a third header main pipe, a third header inlet pipe, a third header outlet branch pipe and a nozzle head, wherein,

[0016] The nozzle head is arranged at the outlet of each third header water outlet branch pipe, and the third header water outlet branch pipe comprises a third upper water outlet branch pipe, a third middle water outlet branch pipe and a third lower water outlet branch pipe, and the nozzle head axes of the third upper water outlet branch pipe, the third middle water outlet branch pipe and the third lower water outlet branch pipe are arranged towards the center direction of the work roller.

[0017] Preferably, the distance between the third header main pipe center line and the work roller center line of the rack is 680mm-720mm.

[0018] Preferably, the nozzle head axes of the third upper water outlet branch pipe, the third middle water outlet branch pipe and the third lower water outlet branch pipe are arranged downwards.

[0019] Preferably, the angle between the nozzle head of the third upper water outlet branch pipe and the horizontal line is 25-35 degrees, the angle between the nozzle head of the third middle water outlet branch pipe and the horizontal line is 10-20 degrees, and the angle between the nozzle head axis of the third lower water outlet branch pipe and the horizontal line is 3-10 degrees.

[0020] The utility model also provides a hot continuous rolling finishing stand, and the outlet side work roller cooling device of the hot continuous rolling finishing stand is arranged.

[0021] The utility model provides a hot continuous rolling finishing stand, and the outlet side work roller cooling device of the hot continuous rolling finishing stand is arranged.

[0022] 1. By setting the angle of the three rows of nozzles of the first header water outlet branch pipe, the problem that the cooling lower header and upper header of the outlet side work roller of the CSP hot continuous rolling F5 finishing stand are not considered when the nozzle is sprayed on the work roller section, the spray coverage area (angle) is too small, the temperature gradient of the F5 finishing stand work roller is not enough, and the maximum temperature of the middle part of the work roller surface and the minimum temperature of the edge part, that is, the temperature gradient does not meet the production requirement is solved.

[0023] 2. The problem that the cooling lower header and upper header of the outlet side work roller of the F5 finishing stand are not considered when the nozzle is sprayed in the prior art is solved, and there is no interference between the spray water marks in the length direction of the work roller body when the work roller cooling device is normally sprayed.

[0024] 3. By arranging the water outlet pipe diameter of the water outlet unit to be thick in the middle and thin on both sides, the problem that the water distribution in the length direction of the work roller body is seriously more than the narrowest width of the continuous rolling in the middle uniform area of the nozzle on the cooling lower header and upper header of the outlet side work roller of the CSP hot continuous rolling F5 finishing stand in the prior art is solved.

[0025] 4、In the prior art, in order to avoid the devices and ensure that the last row and the middle row are completely aligned with the work roll core injection, the mechanical structure of the F5 finishing mill exit side work roll cooling upper header is redesigned, and it is fully ensured that there is no interference between the devices during installation;

[0026] 5、The problem that the F6 finishing mill work roll cooling strength is not enough, and the middle temperature maximum value and the edge temperature minimum value of the work roll surface, that is, the temperature gradient do not meet the production requirements, caused by the fact that the nozzle injection coverage area (angle) on the work roll section of the CSP hot continuous rolling F6 finishing mill exit side work roll cooling upper header is too small and the temperature recovery area between the adjacent two rows is too large is avoided;

[0027] 6、The problem that the nozzle injection water marks interfere with each other during injection when the CSP hot continuous rolling F6 finishing mill exit side work roll cooling upper header is designed is avoided, the nozzle arrangement on the header is redesigned, and it is ensured that there is no interference between the injection water marks in the length direction of the work roll body during normal injection between the adjacent two nozzles in the same row and between the adjacent two rows of nozzles;

[0028] 7、The water distribution in the length direction of the work roll body of the nozzle on the CSP hot continuous rolling F6 finishing mill exit side work roll cooling upper header during normal injection is avoided, the middle uniform distribution area seriously exceeds the narrowest width of the full-length rolling, the water distribution adopts a "convex" type water distribution, the middle water distribution uniform distribution area is completely matched with the narrowest width of the full-length rolling, and the process requirements in production are met;

[0029] 8、In the CSP hot continuous rolling F6 finishing mill exit side work roll cooling upper header, there are a dust removal upper header and a protective cover of the dust removal upper header, and there is a roll changing trolley supporting the roll, in order to avoid the devices and ensure that the three rows of nozzles are aligned with the work roll core injection, the mechanical structure of the F6 finishing mill exit side work roll cooling upper header is redesigned, and it is fully ensured that there is no interference between the devices during installation. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structure schematic view of the cooling lower header mechanism in the outlet side work roll cooling device of the hot continuous rolling finishing mill frame for the F5 finishing mill frame;

[0031] Figure 2 It is a structure schematic view of the cooling upper header mechanism in the outlet side work roll cooling device of the hot continuous rolling finishing mill frame for the F5 finishing mill frame;

[0032] Figure 3 The utility model discloses the outlet side working roll cooling device of hot continuous rolling finishing stand's structure schematic diagram for the cooling lower header mechanism for F6 finishing stand time.

[0033] In the drawing, 11-first header main pipe, 12-second header main pipe, 13-third header main pipe, 21-first header water inlet pipe, 22-second header water inlet pipe, 23-third header water inlet pipe, 311-first upper water outlet branch pipe, 312-first intermediate water outlet branch pipe, 313-first lower water outlet branch pipe, 314-second upper water outlet branch pipe, 315-second intermediate water outlet branch pipe, 316-second lower water outlet branch pipe, 317-third upper water outlet branch pipe, 318-third intermediate water outlet branch pipe, 319-third lower water outlet branch pipe, 4-nozzle head, 5-lower working roll.

[0034] The utility model discloses the realization, functional characteristics and advantage will further be explained with reference to the drawings with example. Specific implementation

[0035] It should be understood that the specific embodiments described herein are merely intended to explain the present utility model, and are not intended to limit the present utility model.

[0036] It should be noted that in the description of the utility model, the orientation or position relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] The utility model discloses the outlet side working roll cooling device of hot continuous rolling finishing stand.

[0038] In the preferred embodiment, the outlet side working roll cooling device of hot continuous rolling finishing stand includes a cooling lower header mechanism, when the cooling lower header mechanism is used for F5 finishing stand, the cooling lower header mechanism includes a first header main pipe 11, a first header water inlet pipe 21, a first header water outlet branch pipe and a nozzle head 4, wherein,

[0039] The first header water inlet pipe 21 and the first header water outlet branch pipe are in communication with the first header main pipe 11, the first header water outlet branch pipe is provided with multiple rows in the height direction of the first header main pipe 11, a nozzle head 4 is installed at each first header water outlet branch pipe outlet, the first header water outlet branch pipe includes a first upper row water outlet branch pipe 311, a first intermediate water outlet branch pipe 312 and a first lower row water outlet branch pipe 313, the nozzle head 4 axis of the first upper row water outlet branch pipe 311 is arranged in a downward inclined manner, the nozzle head 4 axis of the first intermediate water outlet branch pipe 312 is arranged in a horizontal manner, and the nozzle head 4 axis of the first lower row water outlet branch pipe 313 is arranged in an upward inclined manner.

[0040] Specifically, the included angle between the nozzle head 4 axis of the first upper row water outlet branch pipe 311 and the nozzle head 4 axis of the first lower row water outlet branch pipe 313 and the nozzle head 4 axis of the first intermediate water outlet branch pipe 312 is 10-16 degrees.

[0041] Specifically, the first upper row water outlet branch pipe 311, the first intermediate water outlet branch pipe 312 and the first lower row water outlet branch pipe 313 are each provided with multiple first water outlet units in the length direction of the header main pipe, and the water outlet pipe diameter of the multiple first water outlet units is thick in the middle and thin on both sides. In this way, the water distribution is ensured to be uniform in the middle and small on the sides, that is, the water distribution is in the shape of a "convex" character, the water distribution in the middle area is uniform, and the area completely covers the narrowest width in the production of the F5 finishing mill stand of the CSP hot continuous rolling

[0042] Further, the outlet side work roll cooling device of the hot continuous rolling finishing mill further includes a cooling upper header mechanism, when the cooling upper header mechanism is used for the F5 finishing mill stand, the cooling upper header mechanism includes a second header main pipe 12, a second header water inlet pipe 22, a second header water outlet branch pipe and a nozzle head 4, wherein,

[0043] A nozzle head 4 is installed at each second header water outlet branch pipe outlet, the second header water outlet branch pipe includes a second upper row water outlet branch pipe 314, a second intermediate water outlet branch pipe 315 and a second lower row water outlet branch pipe 316, the nozzle head 4 axis of the second upper row water outlet branch pipe 314 is arranged in a downward inclined manner, and the nozzle head 4 axis of the second intermediate water outlet branch pipe 315 and the second lower row water outlet branch pipe 316 is arranged towards the center direction of the work roll.

[0044] Since the lowermost end of the cooling upper header of the outlet side work roll of the F5 finishing mill stand does not interfere with the dust removal upper header of the F5 finishing mill stand and the dust removal upper header, and interference between the roll changing trolley of the outlet side upper support roll of the F5 finishing mill stand is also required, in the design, the spray position of the uppermost row of nozzles still uses the original header cross section spray position, and the spray position of the intermediate row and the lowermost row of nozzles is strictly aligned with the center direction of the work roll.

[0045] Further, the second upper water outlet branch pipe 314, the second intermediate water outlet branch pipe 315 and the second lower water outlet branch pipe 316 are provided with a plurality of second water outlet units in the length direction of the header main pipe, and the water outlet pipe diameter of the plurality of second water outlet units is thick in the middle and thin on both sides.

[0046] When the three-row nozzles spray, the water distribution of the nozzles in the length direction of the work roll body is adjusted to ensure that the water distribution is uniform in the middle and small on the sides, that is, the water distribution is in the shape of a "convex" character, and the uniform water distribution in the middle region completely covers the narrowest width in the production of the F5 finishing mill stand of the CSP hot continuous rolling.

[0047] In the embodiment, when the cooling lower header mechanism is used for the F6 finishing mill stand, the cooling lower header mechanism comprises a third header main pipe 13, a third header water inlet pipe 23, third header water outlet branch pipes and nozzle heads 4, wherein,

[0048] Each third header water outlet branch pipe is provided with a nozzle head 4, and the third header water outlet branch pipes comprise a third upper water outlet branch pipe 317, a third intermediate water outlet branch pipe 318 and a third lower water outlet branch pipe 319, and the nozzle head 4 axes of the third upper water outlet branch pipe 317, the third intermediate water outlet branch pipe 318 and the third lower water outlet branch pipe 319 are arranged towards the center direction of the work roll.

[0049] Further, the distance between the center line of the third header main pipe 13 and the center line of the work roll of the F7 mill stand is 680mm~720mm.

[0050] Specifically, the nozzle head 4 axes of the third upper water outlet branch pipe 317, the third intermediate water outlet branch pipe 318 and the third lower water outlet branch pipe 319 are arranged downwards. The angle between the nozzle head 4 of the third upper water outlet branch pipe 317 and the horizontal line is 25 degrees~35 degrees, the angle between the nozzle head 4 of the third intermediate water outlet branch pipe 318 and the horizontal line is 10 degrees~20 degrees, and the angle between the nozzle head 4 axis of the third lower water outlet branch pipe 319 and the horizontal line is 3 degrees~10 degrees.

[0051] The outlet side work roll cooling device of the hot continuous rolling finishing mill stand provided in the embodiment has the following beneficial effects:

[0052] 1. By setting the angle of the three-row nozzles of the first header water outlet branch pipe, the problem that the cooling intensity of the F5 finishing mill stand work roll is not enough and the temperature gradient of the work roll surface, that is, the maximum middle temperature and the minimum edge temperature do not meet the production requirements due to the fact that the adjacent two rows have a large temperature recovery area because the spray coverage area (angle) of the nozzles on the work roll section is too small is solved.

[0053] 2. The problem of interference between the water marks of the nozzles when spraying is solved, and the water marks do not interfere with each other in the length direction of the work roll body during normal spraying.

[0054] 3. The problem of uneven water distribution in the length direction of the work roll body is solved by setting the diameter of the water outlet pipe of the water outlet unit to be thick in the middle and thin on both sides.

[0055] 4. The mechanical structure of the upper header pipe of the work roll cooling system of the F5 finishing stand is redesigned to avoid interference with the dust removal header pipe and its protective cover, and the roll changing trolley that supports the roll.

[0056] 5. The problem of insufficient cooling intensity of the work roll of the F6 finishing stand is solved by considering the small spraying coverage area (angle) of the nozzles in the cross section of the work roll.

[0057] 6. The problem of interference between the water marks of the nozzles when spraying is solved by redesigning the arrangement of the nozzles on the header pipe.

[0058] 7. The problem of uneven water distribution in the length direction of the work roll body is solved by ensuring that the water distribution adopts a "convex" type, and the middle uniform water distribution area completely matches the narrowest width of the continuous rolling process.

[0059] 8、Because of CSP hot continuous rolling F6 finishing mill exit side work roll cooling upper header, lower dust removal upper header and dust removal upper header protection cover, upper support roll change trolley, in order to avoid these devices, at the same time ensure that three rows of nozzles are aligned with the work roll core injection, the mechanical structure of the F6 finishing mill exit side work roll cooling upper header is redesigned, and it is fully ensured that there is no interference between the devices during installation.

[0060] The utility model further provides a hot continuous rolling finishing mill.

[0061] A hot continuous rolling finishing mill, comprising an exit side work roll cooling device of the hot continuous rolling finishing mill, the specific structure of the exit side work roll cooling device referring to the above-mentioned embodiments, which will not be repeated here.

[0062] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation, direct or indirect application in other related technical fields by using the content of the utility model specification and drawings are also included in the patent protection range of the utility model.

Claims

1. A work roll cooling device at an exit side of a finishing stand of a hot tandem mill, characterized by, The cooling lower header mechanism comprises a first header main pipe, a first header water inlet pipe, a first header water outlet branch pipe and a nozzle head, wherein, The first header water inlet pipe and the first header water outlet branch pipe are both in communication with the first header main pipe, the first header water outlet branch pipe is provided with multiple rows in the height direction of the first header main pipe, each first header water outlet branch pipe is provided with a nozzle head, the first header water outlet branch pipe comprises a first upper row water outlet branch pipe, a first intermediate water outlet branch pipe and a first lower row water outlet branch pipe, the nozzle head axis of the first upper row water outlet branch pipe is arranged in a downward inclination, the nozzle head axis of the first intermediate water outlet branch pipe is arranged in a horizontal direction, and the nozzle head axis of the first lower row water outlet branch pipe is arranged in an upward inclination; the first upper row water outlet branch pipe, the first intermediate water outlet branch pipe and the first lower row water outlet branch pipe are all provided with multiple first water outlet units in the length direction of the header main pipe, and the water outlet pipe diameter of the multiple first water outlet units is thick in the middle and thin on both sides.

2. The work roll cooling device at the exit side of a hot continuous rolling finishing stand according to claim 1, characterized in that, The included angle between the nozzle head axis of the first upper row water outlet branch pipe and the nozzle head axis of the first lower row water outlet branch pipe and the nozzle head axis of the first intermediate water outlet branch pipe is 10-16 degrees.

3. The work roll cooling device at the exit side of a hot continuous rolling finishing stand according to claim 1, characterized in that, The cooling upper header mechanism comprises a second header main pipe, a second header water inlet pipe, a second header water outlet branch pipe and a nozzle head, wherein, Each second header water outlet branch pipe is provided with a nozzle head, the second header water outlet branch pipe comprises a second upper row water outlet branch pipe, a second intermediate water outlet branch pipe and a second lower row water outlet branch pipe, the nozzle head axis of the second upper row water outlet branch pipe is arranged in a downward inclination, and the nozzle head axis of the second intermediate water outlet branch pipe and the second lower row water outlet branch pipe is arranged towards the center direction of the work roll.

4. The work roll cooling device at the exit side of a hot finishing stand according to claim 3, characterized in that, The second upper row water outlet branch pipe, the second intermediate water outlet branch pipe and the second lower row water outlet branch pipe are all provided with multiple second water outlet units in the length direction of the header main pipe, and the water outlet pipe diameter of the multiple second water outlet units is thick in the middle and thin on both sides.

5. The work roll cooling device at the exit side of a finishing mill stand of a hot tandem mill according to any one of claims 1 to 4, characterized in that, When the cooling lower header mechanism is used for the F6 finishing stand, the cooling lower header mechanism comprises a third header main pipe, a third header water inlet pipe, a third header water outlet branch pipe and a nozzle head, wherein, Each third header water outlet branch pipe is provided with a nozzle head, the third header water outlet branch pipe comprises a third upper row water outlet branch pipe, a third intermediate water outlet branch pipe and a third lower row water outlet branch pipe, and the nozzle head axis of the third upper row water outlet branch pipe, the third intermediate water outlet branch pipe and the third lower row water outlet branch pipe is arranged towards the center direction of the work roll.

6. The work roll cooling device at the exit side of a hot finishing stand according to claim 5, characterized in that, The distance between the center line of the third header main pipe and the center line of the work roll of the F7 stand is 680-720 mm.

7. The work roll cooling device at the exit side of a hot finishing stand according to claim 5, characterized in that, The nozzle head axis of the third upper row water outlet branch pipe, the third intermediate water outlet branch pipe and the third lower row water outlet branch pipe is arranged in a downward direction.

8. The work roll cooling device at the exit side of a finishing mill stand of a hot tandem mill according to claim 5, characterized by, The included angle between the nozzle head of the third upper row water outlet branch pipe and the horizontal line is 25-35 degrees, the included angle between the nozzle head of the third intermediate water outlet branch pipe and the horizontal line is 10-20 degrees, and the included angle between the nozzle head axis of the third lower row water outlet branch pipe arranged in a downward direction and the horizontal line is 3-10 degrees.

9. A hot continuous rolling finishing stand, characterized in that The outlet side work roll cooling device of the hot continuous rolling finishing stand comprises the cooling device of the hot continuous rolling finishing stand according to any one of claims 1-8.

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