JPH0673462A - Device for cooling metal strip - Google Patents

Abstract

PURPOSE:To enable quick cooling while uniformizing strip temp. in strip width direction at low operating cost for the wide range of size of the metal strip in a cooling device for executing the cooling of the metal strip by using cooling rolls. CONSTITUTION:Each of three nozzle headers arranged facing each cooling roll 2 and in the longitudinal direction of the roll barrel part, is adjusted to move to each of the edge parts and the center part of the strip by a movement adjustment device 6 controlled by a nozzle header position control arithmetic device 13 to which the signal from a metal strip both edge part position detector 14 is inputted. Further, a strip temp. control arithmetic device 12 to which the signal of a strip thermometer 15a for strip arranged on the outlet side of a roll cooling device is inputted calculates the deviation of the strip temps. at both edge parts from an aimed strip temp. distribution and the deviation of the strip temp. at the center part from the aimed strip temp. distribution respectively, and according to these values of deviations, working controls for adjusting a pressure adjusting valve 9 and the number of revolutions of a supplying blower 10a are executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal band cooling device for a continuous heat treatment line.

[0002]

2. Description of the Related Art In a gas jet cooling and roll cooling facility in a continuous annealing furnace, a non-uniform temperature distribution often occurs in the metal band width direction, resulting in non-uniform material, quality such as buckling and shape defect, or strip running. It causes problems in sex. Therefore, in JP-A-60-169524, as shown in FIG. 10, cooling rolls 2a to 2d are installed in a device that cools the metal strip 1 at the contact surfaces while being spun around a plurality of cooling rolls 2a to 2d.
FIG. 11 shows the gas jet devices 3a to 3d arranged so as to face each other.
As shown in Fig. 3, the metal strip 1 is divided into multiple pieces in the width direction of the strip 31a.
To 31e, and gas flow control valves 9a to 9e for each of the divided sections, and the average temperature in the plate width direction from the plate thermometers 15a to 15d that detect the temperature distribution in the plate width direction of the metal strip 1 shown in the previous figure. The temperature difference at each point in the plate width direction with respect to is calculated, and when this temperature difference exceeds the allowable limit, the position in the plate width direction is detected,
There is disclosed a cooling device for a metal band, which is composed of plate temperature control devices 12a to 12d that adjust the gas flow control valves 9a to 9e corresponding to this position.

[0003]

Applying the above configuration to actual equipment, the plate thickness is 0.5 to 2.3 mm, the plate width is 850 to 1575 mm, the cooling device inlet plate temperature is 550 to 680 ° C, and the cooling device outlet plate temperature is 350 to 480. As a result of conducting the cooling experiment of the metal strip only with the cooling rolls under the condition of ℃, in all cases, both ends of the plate and the center of the plate become higher than the average plate temperature in the plate width direction as shown in FIG. It was found to be the mold temperature profile.

That is, in the central portion of the plate, a positive plate temperature deviation with respect to the average plate temperature in the plate width direction occurs within a certain range of the plate width regardless of the metal band size and cooling conditions. Further, at both end portions of the plate, the plate temperature deviation with respect to the average plate temperature in the plate width direction becomes larger as the plate thickness, the speed or the plate temperature drop amount in the cooling device becomes larger.

As a result of an experiment and an analysis of the cause of this occurrence, the following was found. When a metal strip is wound around a cooling roll, a tensile / compressive stress distribution is generated in the plate thickness direction, but due to this Poisson's ratio deformation due to this stress, a compressive / tensile stress distribution is induced in the direction orthogonal to that, that is, in the plate width direction. As shown in 13, a reverse bending deformation (hereinafter referred to as saddle type deformation) occurs in the direction perpendicular to the main bending.

Once this saddle type deformation occurs, poor contact occurs near both ends of the metal strip, resulting in insufficient cooling and a positive plate temperature deviation with respect to the average plate temperature in the plate width direction.
In the cooling of only the cooling roll, when the metal strip advances to the next cooling roll, the contact fault due to the saddle-shaped deformation is further added to the contact fault due to the difference in elongation in the metal strip longitudinal direction due to the positive plate temperature deviation, It develops into a large positive plate temperature deviation.

The non-contact length L between the metal strip and the cooling roll at both ends of the metal roll by the winding of the cooling roll and the lift amount Z at both ends are expressed by the following equations 4 and 5, for example: Plate thickness 1.0 mm, cooling roll radius 800 mm, plate temperature 600
Under the condition of ° C, the non-contact length L is about 15 mm and the lift amount Z is about 0.1 mm.

[0008]

[Equation 4]

[0009]

[Equation 5]

However, JP-A-60-169524
In the metal band cooling device of No. 6, it is necessary to significantly increase the number of divisions of the gas jet device in the plate width direction in order to support the cooling of the plate width of a wide range of metal bands. There is a drawback in that the equipment cost will increase due to a large increase in quantity.

Further, when the number of divisions in the plate width direction is about 5 as in the embodiment of the same item shown in FIG. 11, the divided nozzle width becomes large, the gas flow rate increases, and the operating cost increases. In addition to the above, supercooling occurs in the vicinity of both ends of the metal strip, and as is apparent from FIG. 6 showing the experimental results described later, it is not possible to achieve sufficient uniformization of the plate temperature in the plate width direction. There is.

The present invention has been made to solve the above-mentioned problems, and a metal band cooling device capable of rapidly cooling a wide range of sizes while making the plate temperature in the plate width direction uniform at a low operating cost. Is to be proposed.

[0013]

Therefore, the metal strip cooling device of the present invention is a roll cooling device for winding a metal strip around one or more cooling rolls to adjust the contact length between the metal strip and each cooling roll. A nozzle header narrower than the width of two or more metal strips in the lengthwise direction of the roll, and the nozzle headers are moved in the moving direction of the cooling roll. A gas cooling device having a flexible structure and at least one of these nozzle headers being movable in the roll cylinder length direction, and a gas adjusting device for adjusting a cooling gas pressure or a gas flow rate inside each nozzle header. The basic feature is to have a device.

The hot point of the w-shaped non-uniform temperature distribution as described above has a narrow width, and when a plurality of nozzles are provided in the width direction of the metal band as in the conventional structure, it corresponds to the partition wall portion. When the hot point is present at a location, it is difficult to cool that portion, and if an attempt is made to cool it, the portion around the hot point will be overcooled. In this configuration,
By moving the narrow nozzle header of the gas cooling device just above the hot point and blowing out the cooling gas whose pressure or flow rate is adjusted by the gas adjusting device toward the hot point, the concentrated portion of that part is concentrated. Let it cool down,
It is intended to effectively eliminate the uneven temperature distribution.

The nozzle header is configured to be movable in the moving direction of the cooling roll because the cooling roll can move in the direction orthogonal to the metal strip pass line in order to change the contact length of the cooling roll. It is necessary to ensure that the nozzle header always has a suitable distance for backside cooling (in this case it moves in the same direction as the chill roll moves) and that the header does not come into contact with the metal strip. Therefore, immediately before the chill roll separates from the metal strip pass line, the nozzle header moves in the opposite direction to the retract position direction. When the chill roll starts to contact the metal strip pass line, the nozzle roll moves from the retract position to the chill roll. The nozzle header moves in the opposite direction so as to approach).

Further, since it is suitable for intensive cooling of a narrow hot point, the nozzle opening of the nozzle header has a slit shape formed in a direction substantially orthogonal to the flow of the metal strip, and has a flow direction of the metal strip. It is advisable to use a product in which these are perforated.

When two nozzle headers are provided in the lengthwise direction of the roll cylinder, they are arranged at the widthwise end portions of the metal strips, and when three nozzle headers are provided, one of them is formed in the metal strip widthwise direction. It is arranged in the central portion (the nozzle header arranged in the central portion may be fixed to the central portion without moving in the roll cylinder length direction), and the remaining two are end portions in the width direction of the metal strip. Is effective in eliminating the w-shaped uneven distribution of the plate temperature (the uneven temperature distribution is generally higher at both end portions than at the central portion, and therefore the movement of the nozzle header to both end portions is prevented). Prioritize).

Of course, the present invention can be applied not only to a structure having one cooling roll but also to a structure having two or more cooling rolls. In the case of a structure having a plurality of cooling rolls, at least the first cooling roll has a nozzle header. It suffices to provide three of them with the above header arrangement configuration. Further, these cooling rolls are provided with two divisions, a front stage portion and a rear stage portion, and three nozzle headers are provided for the front stage cooling rolls. In addition to the header arrangement, it is advisable to use two nozzle headers for the cooling rolls in the subsequent stage and to adopt the header arrangement in the case of two nozzle headers. As described above, the three nozzle header configurations for at least the first cooling roll or the preceding cooling roll are used because the central portion of the metal strip bulges at the start of contact with the cooling roll [as shown in FIG. 9 (a),
The body part of the roll y which is not in contact with the plate x due to the defective plate shape is cooled by the refrigerant inside the cooling roll than the part in contact with the plate x, and even if the plate shape is improved, as shown in FIG. The central portion is not cooled, and the central portion of the plate expands as compared with the both ends of the plate due to the difference in plate temperature in the width direction, as shown in FIG. This is called a middle bulge. Especially in the case of thin materials with low rigidity, squeezing will occur with terrible materials.] When a non-uniform temperature distribution occurs due to the characteristics of the cooling roll, the non-uniform temperature distribution increases after that, so roll contact starts. For the purpose of eliminating the defective plate shape in the initial stage, a nozzle header is also provided in the center of at least the first cooling roll or the cooling roll of the previous stage, and intensive cooling of that part and gas blowing from the back surface are performed. This is because by doing so, the problem of the bulge is solved (even if the product is thick, it is particularly effective for the first roll). On the contrary, if at least the first cooling roll or the preceding cooling roll has three nozzle headers including the central nozzle header, it is sufficient for the subsequent cooling rolls to have nozzle headers at both ends of the metal strip. It will be.

On the other hand, when a plurality of cooling rolls are installed as described above, the movement mode of the nozzle header in the preceding stage in the roll movement direction and the movement of the nozzle header in the succeeding stage are set to be different. You can also That is, as described above, the purpose of early elimination of the plate shape near the start of contact between the metal strip and the cooling roll (others have a very low heat load, even with only the cooling roll in the preceding stage, these can reach the maximum pushing amount. Therefore, it is necessary to increase the cooling amount as much as possible even for the back side cooling of the front roll so that the separation distance from the roll becomes constant as the cooling roll moves. The nozzle header in the previous stage is configured to follow the movement,
Make the cooling effect in the previous stage high. On the other hand, the latter nozzle header does not necessarily have such a request and may be fixed, but on the other hand, when the cooling roll reaches the maximum pushing amount, the length of the facing nozzle header is maximized. When the header is designed, when a certain chill roll becomes unusable and the pushing amount of the chill roll immediately before or immediately after that becomes shallow, the nozzle header that follows it or the nozzle header fixed to the back thereof is a metal strip. It is necessary to be able to evacuate because it will come into contact with. Therefore, the nozzle header in the latter stage can be set to be moved to a predetermined position during normal cooling and set to be retracted to the retract position only in an emergency or when cooling is not performed, so that it does not follow the movement of the cooling roll. .

In order to eliminate the non-uniform temperature distribution in the plate width direction caused by the saddle type deformation or the like, the cooling amount should be made as large as possible on the upstream side where the deformation occurs, and the temperature should be uniform in the plate width direction. Cooling backside cooling should be focused on the upstream side. Therefore, not only the first cooling roll on the upstream side, especially the first cooling roll, is sequentially pushed in from the upstream cooling roll to obtain a large cooling length, but also the upstream nozzle header is sequentially cooled by maximizing its gas ejection capacity, and the shortage Should be supplemented on the downstream side. Further, since the method of pushing in the cooling roll which takes a larger winding length in order from the first cooling roll is used, when the heat load (that is, t / h) is low, the cooling roll on the downstream side has a nozzle header for backside cooling and a metal. The distance of the belt increases. In order to reduce energy loss at this time, the shutoff valve installed in each nozzle header is closed when the distance between the nozzle header and the cooling roll exceeds a certain distance.

Further, in the case where the above configuration is provided, the width changing connection information device (the cooling roll unit is configured to track the connection information by welding or the like from the line entrance side based on the loading order of metal bands, width, and measured metal band length. The position of the nozzle header and the movement information of the nozzle header in the roll cylinder length direction according to the width change amount), the position detectors at both ends of the metal strip [photocell and photoreceiver, laser and photoreceiver, metal strip] Metal band width direction which can be distinguished from the difference in temperature between the high temperature part of the part and the low temperature part other than the metal band. A detector using a plate thermometer (profile thermometer) or a combination thereof], metal band width direction By arranging one or more of the plate thermometers on the inlet side of the cooling roll and obtaining information on the width changing portion or the width changing amount based on these pieces of information, the nozzle header for the width direction end portion is provided in the metal strip width direction. You can also set it at the end . That is, when a singular point of a connecting portion with a different board width enters, this singular point information is tracked from the line entry side, and when changing from a narrow material to a wide material,
Immediately before the singular point enters, the nozzle header is moved to a predetermined position (the nozzle header is moved in a direction away from it), and when the wide material is changed to the narrow material, the singular point is After passing through the outlet side, the nozzle headers are started to move toward a predetermined position (the nozzle headers move toward each other). This is because when it is a narrow material, it does not contact with the metal strip, so in the roll part where heat crown is hardly generated, contact failure is likely to occur even if the next wide material comes, and the tension of the metal strip when changing to a wide material. Is relatively decreased, resulting in more defective contact. Therefore, in such a case, if the nozzle header is moved to a predetermined position in advance and the metal strip and the cooling roll are already in good contact with each other by rear surface cooling when the material is changed to the wide material, good. However, when the metal strip is meandering or the like, these nozzle headers move together in the meandering direction.

Further, under the condition that the plate thickness, speed, or the plate temperature drop amount in the cooling device is large, it is difficult to eliminate the plate temperature deviation in the plate width direction by the gas cooling device arranged facing the cooling roll. In this case, in addition to the configuration of the gas cooling device or the like, the cooling roll or the cooling roll group is disposed immediately opposite to the metal strip so as to face two or more gases in the plate width direction of the metal strip. A nozzle header and at least one of these nozzle headers (more preferably two, especially two at both ends)
This problem can be solved by using an auxiliary gas cooling device in which the nozzle header is movable in the metal strip width direction and a gas adjusting device that adjusts the cooling gas pressure or gas flow rate inside each nozzle header. It

Even in that case, by providing one or more of the width change connection information device, the metal band both end position detectors, and the metal band width direction plate thermometer as described above on the inlet side of the cooling roll, Based on the information of the width change part or width change amount information,
If the nozzle header for the widthwise end of the gas cooling device and / or the two nozzle headers at both ends of the auxiliary gas cooling device in the metal bandwidth direction are set at the ends of the metal bandwidth direction respectively, the plate widths will differ. It is possible to move each nozzle header to a predetermined position in advance or after the entrance of the singular point of the connection portion.

In addition to the above feedforward control, a metal strip width direction plate thermometer is arranged on the outlet side of the cooling roll or the outlet side of the auxiliary gas cooling device, and based on the information, for the widthwise end portion of the gas cooling device. It is also possible to perform feedback control in which the two nozzle headers of the nozzle header and / or the both ends of the auxiliary gas cooling device in the metal band width direction are set at the end parts in the metal band width direction, respectively.

Regarding the above feedback control, with or without the movement control of the nozzle header, each nozzle header of the gas cooling device and / or the auxiliary gas cooling is performed based on the plate temperature information on the outlet side. It can also be performed by adjusting each cooling gas pressure or gas flow rate of each nozzle header of the apparatus.

According to the present invention, there is further provided a roll cooling device in which a metal strip is wound around one or more cooling rolls, and the contact length between the metal strip and each cooling roll is individually adjusted. The nozzles are arranged to have three or more nozzle headers in the roll cylinder length direction, and these nozzle headers are movable in the movement direction of the cooling roll, and at least one of these nozzle headers is arranged in the roll cylinder length direction. A movable gas cooler, a metal band end position detector for detecting the plate end of the metal band, and a nozzle header of the nozzle header, which is movable in the roll cylinder length direction, are arranged in the roll cylinder length direction. A movement adjusting device for moving and adjusting, and a nozzle header position control arithmetic device for controlling the movement adjusting device based on a detection signal of the metal band both ends position detector,
An advance / retreat adjusting device that adjusts the position of the nozzle header in the moving direction of the cooling roll by a position signal of the cooling roll, and a metal strip width direction plate that is arranged on the exit side of the cooling roll and detects the temperature distribution in the plate width direction of the metal strip. A plate temperature control calculation device that calculates a temperature deviation from a target plate temperature distribution using a thermometer and a temperature signal from the plate temperature gauge, and adjusts the cooling gas pressure or gas flow rate inside each nozzle header according to this temperature deviation. We also propose a metal strip cooling device having and.

In the above structure, the nozzle position control arithmetic unit moves the nozzle header in the roll cylinder length direction based on the detection data detected by the position detectors at both ends of the metal strip. The reason is that the position where the plate temperature distribution of the metal strip is high is substantially determined in the width direction.
However, as described above, if a plate temperature profile thermometer is used for the position detectors at both ends of the metal strip, the position where the plate temperature distribution is particularly high should be set as the plate end of the metal strip as the moving position of the nozzle header. You can also Further, in this configuration, the nonuniform plate temperature distribution is controlled by the feedback control by the plate temperature control arithmetic unit which inputs the detection data of the metal strip width direction plate thermometer arranged on the outlet side of the cooling roll or the outlet side of the auxiliary gas cooling device. As a method for eliminating the unevenness, the unevenness is eliminated by adjusting the cooling gas pressure or gas flow rate inside each nozzle header according to the temperature deviation with respect to the target plate temperature distribution.

The target plate temperature distribution may be preset, but for example, the average plate temperature of two quarter portions in the width direction of the metal strip (in some cases, there is + α from that temperature) is taken as the center of the plate width. Alternatively, the actually measured plate temperature of the central portion (which may be 0 ° C. to 20 ° C. lower than that temperature in some cases) may be used as the target temperature of both ends of the plate width.

Further, in the above structure, the auxiliary gas cooling device (at least one of these nozzle headers) as described above is used.
One nozzle header, particularly a structure in which two nozzle headers at both ends are movable in the metal band width direction) and a metal band width direction plate thermometer arranged on the outlet side of the auxiliary gas cooling device are used together. You may use.

On the other hand, the length of the plate temperature deviation portion with respect to the average plate temperature in the plate width direction generated at both ends of the metal strip is relatively narrow as can be obtained by the equation (4). Further, the average strip temperature deviation ΔT at the end of the metal strip defined by the following equation 6 greatly changes depending on the cooling width and the strip thickness as shown in FIG. Therefore, both ends of the metal band are detected by the position detectors at both ends of the metal band, and based on the position signals, the nozzle headers at both ends are properly moved in the length direction of the roll cylinder (or the width direction of the metal band) using an adjustment device. The plate temperature deviation can be minimized by moving and adjusting the cooling width.

[0031]

[Equation 6]

This proper cooling width Xe is expressed by the following equations 7 and 8 from FIG.

[0033]

[Equation 7]

[0034]

[Equation 8]

However, as shown in FIG. 5, in the vicinity of the connection point of the metal strips having different strip widths, the length of unsteady cooling in the longitudinal direction of the strips at the strip end is made as short as possible and the cooling is performed by the cooling. In order to achieve stable striping of the metal strip in the heat treatment furnace after the apparatus, it is experimentally necessary that the length of the unsteady part be within 0.9Lo of the path length Lo between the rolls of the heat treatment furnace. all right. The relationship between the plate width and the nozzle width of the nozzle header at this time is expressed by the following equation (9).

[0036]

[Equation 9]

Therefore, the nozzle width Be of the nozzle headers at both ends can be minimized by selecting the size of the following formula 1 or 2 to minimize the plate temperature deviation occurring at both ends of the metal strip. Strip thickness is not constant, 1.0 mm
If it has a certain range such as ~ 2.0 mm, the nozzle width Be is determined based on the case of the maximum plate thickness).

[0038]

[Equation 1]

[0039]

[Equation 2]

FIG. 6 shows a comparison between the case of cooling using the structure of a gas jet device installed facing the cooling roll shown in the prior art and divided into a plurality of parts in the width direction of the metal, and that of the present invention. Show. This figure depicts the plate temperature distribution in the vicinity of the edge of the metal strip, but it can be seen that the present invention achieves uniform plate temperature distribution with less supercooling regions than in the prior art. The experimental conditions at this time are shown in Table 1 below.

[0041]

[Table 1]

The length of the plate temperature deviation portion with respect to the average plate temperature in the plate width direction occurring in the central portion of the metal strip is within the range shown in FIG. 7, and is installed on the gas cooling device facing the cooling roll and the cooling roll group feeding side. By selecting the nozzle width Bc of each central nozzle header of the auxiliary gas cooling device obtained by the following equation 3, it is possible to minimize the plate temperature deviation occurring in the central part in the plate width direction. As a result, the plate temperature distribution can be made uniform.

[0043]

[Equation 3]

In most cases, the area where the plate temperature deviation occurs is symmetric with respect to the center line in the metal band width direction.
The movement adjustment device may be used in the roll cylinder length direction (or the metal strip width direction) so that the center of the metal strip width direction coincides with the center of the central nozzle.

FIG. 8 shows a comparison of equipment cost / operating cost between the conventional technique and the present invention. By reducing the cooling gas flow rate and the number of valves, etc., it becomes possible to reduce equipment costs / operating costs as shown in the figure.

[0046]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the metal band cooling device of the present invention will be described with reference to FIGS.

FIG. 1 is a side view of a metal band cooling device according to an embodiment of the present invention. The metal strip 1 that has been heated and soaked and then gradually cooled is applied with tension by the bridle rolls 16a to 16c and 16d to 16f installed in front of and behind the metal strip cooling device.

In this roll cooling equipment, a non-uniform temperature distribution tends to occur in the width direction of the metal band, and when such non-uniform temperature distribution occurs in the gas jet zone (not shown) in the preceding stage, this roll cooling equipment Therefore, in this embodiment, the back surface of the roll is cooled by the structure of the metal strip cooling device shown below.

In the structure of this embodiment, the gas cooling device having the nozzle header groups 3a to 3d, which are set as a set of three, and the position detectors at both ends of the metal band installed near the inlet of the metal band cooling device.
14 and movement adjusting devices 6a to 6d for moving and adjusting these nozzle headers in the roll cylinder length direction, respectively, and nozzles for controlling the movement adjusting devices 6a to 6d based on the detection signals of the metal band both end position detectors 14. Header position control arithmetic unit 13 and positions of cooling rolls 2a to 2d and cooling roll contact length adjusting devices 4a to 4d
Signal from the nozzle header group 3a ~ 3d advance and retreat adjusting device 5a ~ 5d for position adjustment in the cooling roll moving direction, and arranged on the outlet side of the cooling roll group, the plate for detecting the temperature distribution in the metal band width direction. A plate temperature for controlling at least one of the opening degree of the pressure control valves 9a to 9d of the gas cooling device or the rotation speed of the gas supply blower 10a based on the temperature signal from the thermometer 15a and the plate thermometer 15a. And a control arithmetic unit 12.

With the above construction, the nozzle header position control arithmetic unit 13 controls the position of each nozzle header of the nozzle header groups 3a to 3d in the roll cylinder length direction based on the signal from the position detector 14 at both ends of the metal strip. The command is sent to the movement adjustment devices 6a-6d. Therefore, the nozzle headers at these end portions are moved and adjusted to the positions corresponding to the end portions of the metal strip, and the central nozzle header is adjusted to the position corresponding to the central portion of the metal strip.

On the other hand, regarding the adjustment of the metal strip contact lengths of the cooling rolls 2a to 2d, the temperature signal from the plate thermometer 15a which can detect the temperature distribution in the plate width direction installed on the outlet side of the roll cooling device is used. Based on this, the plate temperature in the central part in the plate width direction is obtained by the plate temperature control calculation device 12, and the target plate temperature set for carrying out the predetermined heat treatment on the metal strip 1 and this central part plate temperature are the plates. The temperature control calculation device 12 is compared, and the plate temperature control calculation device 12 corresponds to the deviation thereof from the cooling roll contact length adjustment device 4a to
A signal is sent to 4d for adjustment (otherwise, the average temperature in the plate width direction is calculated by the plate temperature control calculation device 12 based on the temperature signal from the plate thermometer 15a, and a predetermined heat treatment is performed on the metal strip 1. The target temperature set for this purpose and this average temperature are compared in the plate temperature control arithmetic unit 12, and the cooling roll contact length adjusting unit 4a from the plate temperature control arithmetic unit 12 corresponding to the deviation.
It can be configured to send a signal to ~ 4d).

Further, in the configuration of this embodiment, the plate temperature control arithmetic unit 12 to which the temperature signal from the plate thermometer 15a is inputted measures the target temperature in the center part in the plate width direction from the average plate temperature of both quarter parts. Target temperatures at both ends of the plate are obtained from the plate temperature, and actually measured temperatures at both ends of the plate and the center of the plate are obtained, and these are compared with the target temperature in the plate width direction. Corresponding to the deviation, the plate temperature control arithmetic unit 12 uses at least one of the rotational speed control of the gas supply blower 10a and the opening adjustment of the pressure control valves 9a to 9d to cool the nozzle header internal cooling gas pressure (pressure gauge). Is omitted). By the above adjustment, the gas ejected from the nozzle header groups 3a to 3d installed facing the cooling roll cools both end portions of the metal strip 1 and the central portion of the plate.

These nozzle header groups 3a to 3d correspond to the positions of the cooling rolls 2a to 2d and the cooling roll contact length adjusting device 4a.
Positions are adjusted in the cooling roll moving direction by the advancing / retreating adjusting devices 5a to 5d in response to signals from 4d. The nozzle header groups 3C and 3d are set and fixed at positions where the distance between the metal strip and the nozzle header group can be appropriately secured when the cooling rolls 2a to 2d are at positions where the maximum contact length with the metal strip can be obtained. May be.

In addition to these configurations, in the present embodiment, the configuration of the auxiliary gas cooling device 7 is provided on the outlet side of the cooling roll group 2, and even with the above configuration of the cooling device, it is difficult to completely overcome the metal strip. The temperature deviation in plate width direction 1 is eliminated. That is, the plate temperature control arithmetic unit 12 is arranged at both ends of the plate by a temperature signal from the plate temperature meter 15b or the plate temperature meter 15a capable of detecting the temperature distribution in the plate width direction installed near the outlet of the auxiliary gas cooling device 7. While determining the temperature of the plate and the temperature of the plate center, compared with the target temperature in the plate width direction, corresponding to the deviation, at least one of the rotation speed control of the gas supply blower 10b or the opening adjustment of the pressure control valve 9e Is used to adjust the cooling gas pressure or gas flow rate inside each nozzle header. Then, the cooling gas is ejected from the nozzle header groups 7a and 7b of the auxiliary gas cooling device 7 installed facing the metal strip 1, and the metal strip 1 passing through the roll cooling device has its plate end portions and the plate central portion. To be cooled.

In each nozzle header of the nozzle header groups 7a and 7b, the position control command is sent to the movement adjusting device 8a by the nozzle header position control arithmetic unit 13 which receives the signal from the position detector 14 at both ends of the metal strip. As a result of being sent to 8b, the nozzles at both ends are moved and adjusted by the movement adjusting devices 8a and 8b to the positions corresponding to the ends of the metal strip, and the central nozzle header is moved to the position corresponding to the central part of the metal strip. It

FIG. 2 is a perspective view of the nozzle header groups 3a to 3d arranged so as to face the cooling rolls (the construction of the advance / retreat adjusting device is omitted in this drawing). Of these, the nozzle headers 31a and 31c at both ends are used for cooling the plate end portions, and the central nozzle header 31b is used for cooling the plate central portion. These nozzle headers 31a to 31c are respectively controlled by the movement adjusting devices 61a to 61c according to the roll cylinder length direction position control command from the nozzle header position control arithmetic device 13, and are moved to the metal strip end portion and the central portion position. Moved and adjusted.

The adjustment of the cooling gas pressure inside the headers of the nozzle header groups 31a to 31c is performed by the plate temperature control arithmetic unit 12
Command from the nozzle headers 31a to 31c, the opening of the pressure control valves 91a to 91c installed in the middle of the pipe 18 leading to the nozzle headers 31a to 31c is adjusted.

FIG. 3 is a perspective view of one side portion of the nozzle header group of the auxiliary gas cooling device 7 arranged on the outlet side of the roll cooling device and facing the metal strip. The nozzle headers 71a and 71c at both ends are used for cooling the plate end portions, and the central nozzle header 71b is used for cooling the plate central portion. These nozzle headers 71a to 71c are respectively controlled by the movement adjusting devices 81a to 81c by a roll cylinder length direction position control command from the nozzle header position control arithmetic device 13, and correspond to the plate end portion and the central portion of the metal strip. It is moved and adjusted to the position.

Further, the cooling gas pressure adjustment inside the headers of the nozzle headers 71a to 71c is controlled by a command from the plate temperature control arithmetic unit 12, and the pipes leading to the nozzle headers 71a to 71c are connected.
18 The opening degree of the pressure control valves 92a to 92c installed on the way is adjusted and the adjustment is performed.

[0060]

As described above, according to the configuration of the present invention, it is possible to rapidly cool a wide range of sizes while making the plate temperature in the plate width direction uniform at a low operating cost.

[Brief description of drawings]

FIG. 1 is a side view of a metal strip cooling device showing one embodiment of the present invention.

FIG. 2 is a perspective view of a gas cooling device arranged to face a cooling roll.

FIG. 3 is a perspective view of an auxiliary gas cooling device installed on the outlet side of the cooling roll group.

FIG. 4 is a graph showing a relationship between a plate end cooling width and a plate temperature deviation near the plate end.

FIG. 5 is a schematic view showing a relationship between a nozzle position of a nozzle header of a gas cooling device and a plate end cooling width when metal bands having different plate widths are connected to each other.

FIG. 6 is a graph showing a plate temperature distribution when a plate end portion of a metal strip is cooled by a gas cooling device arranged facing a cooling roll.

FIG. 7 is a graph showing the plate temperature deviation at the plate center and its range.

FIG. 8 is a graph showing a relative comparison between operating costs and equipment costs of the present invention and the prior art.

FIG. 9 is an explanatory diagram showing a state where a middle bulge is generated.

FIG. 10 is a side view of a cooling device for a metal strip showing an embodiment of the prior art.

FIG. 11 is a perspective view showing a configuration of a gas jet nozzle header used in the embodiment.

FIG. 12 is a graph showing a plate temperature distribution in a plate width direction when cooled only by a cooling roll.

FIG. 13 is a perspective view showing a deformed state of the metal strip when the metal strip is wound around the cooling roll.

[Explanation of symbols]

1 Metal band 2, 2a-2d Cooling roll 3a-3d, 31a, 31b, 31c, 31d, 31e, 32, 33, 7a, 7b, 7
1a, 71b, 71c Nozzle header 4a-4d Cooling roll contact length adjustment device 5a-5d Advancement / retraction adjustment device 6a-6d, 61a-61c, 8a, 8b, 81a-81c Movement adjustment device 9a-9e, 91a-91c, 92a- 92c Pressure control valve 10a, 10b Gas supply blower 12 Plate temperature control calculator 13 Position control calculator 14, 14a, 14b Position detectors at both ends of metal strip 15a, 15b Plate thermometer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Oishi Marunouchi 1-2-2, Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Yasuhiro Araki 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Date Main Steel Pipe Co., Ltd.

Claims (20)

[Claims] 1. A roll cooling device for winding a metal strip around one or more cooling rolls to adjust a contact length between the metal strip and each cooling roll, the roll cooling device being opposed to the cooling roll via the metal strip. However, it has a nozzle header narrower than the width of two or more metal bands in the roll cylinder length direction, and these nozzle headers are configured to be movable in the moving direction of the cooling roll, and at least one of these nozzle headers is provided. A metal strip cooling device comprising: a gas cooling device in which one nozzle header is movable in a roll cylinder length direction; and a gas adjusting device for adjusting a cooling gas pressure or a gas flow rate inside each nozzle header. 2. The metal band cooling device according to claim 1, wherein the nozzle port of the nozzle header has a slit shape formed in a direction substantially orthogonal to the flow of the metal band,
The metal band cooling device according to claim 1, wherein the metal band cooling device is formed by arranging these in a row in the flow direction of the metal band. 3. The metal strip cooling device according to claim 1, wherein two nozzle headers are provided, each nozzle header being arranged at an end portion in the width direction of the metal strip.
Item 2. The metal band cooling device according to item 2. 4. The metal band cooling device according to claim 1, wherein three nozzle headers are provided, one of which is arranged at a substantially central portion of the metal band width direction, and the remaining two are made of metal. The metal band cooling device according to claim 1, wherein the metal band cooling device is arranged at an end portion in the width direction of the band. 5. The metal strip cooling device according to claim 1, wherein a plurality of cooling rolls are installed, and at least the first cooling roll among them is provided with a nozzle header 3
3. The metal according to claim 1, wherein one metal is provided at one end of the metal strip in the widthwise center of the metal strip, and the other two are provided at ends of the metal strip in the widthwise direction. Band cooling device. 6. The metal band cooling device according to claim 1, wherein a plurality of cooling rolls are installed, and at least the cooling roll of the preceding stage is provided with three nozzle headers, one of which is a metal. Arranged at approximately the center of the width direction,
The other two are arranged at the widthwise ends of the metal strips, and the cooling rolls at the subsequent stages are arranged as two nozzle headers at the widthwise ends of the metal strips. The metal band cooling device according to any one of claims 1 to 2. 7. When the structure of the metal band cooling device according to any one of claims 3 to 6 is adopted, one of a width change connection information device, a metal band both end position detector, and a metal band width direction plate thermometer is provided. By arranging the above on the inlet side of the cooling roll and obtaining information on the width changing portion or the width changing amount based on these information, it is possible to set the nozzle header for the width direction end to the metal band width direction end. Characteristic metal band cooling device. 8. The metal strip cooling device according to claim 1, further comprising two nozzle headers arranged at each end of the metal strip in the width direction, and the cooling roll. Immediately behind the metal strip and having two or more nozzle headers for gas spraying in the plate width direction of the metal strip, and at least one of these nozzle headers is provided with the metal strip width. A metal strip cooling device comprising: an auxiliary gas cooling device configured to be movable in any direction, and a gas adjusting device that adjusts a cooling gas pressure or a gas flow rate inside these nozzle headers. 9. The structure of the metal strip cooling device according to claim 1, wherein the nozzle strip has three nozzle headers, one of which is arranged in a substantially central portion of the metal strip width direction, and the rest. Two of them are arranged at the ends of the metal strip in the width direction, and are arranged immediately after the cooling roll so as to face the metal strip, and two or more nozzle headers for spraying gas are provided in the plate width direction of the metal strip. Have,
Further, at least one of these nozzle headers has an auxiliary gas cooling device configured to be movable in the metal band width direction, and a gas adjusting device for adjusting the cooling gas pressure or gas flow rate inside these nozzle headers. A metal band cooling device having. 10. The metal strip cooling device according to claim 1, further comprising a plurality of cooling rolls, wherein at least the first cooling roll is provided with three nozzle headers. One of them is arranged at a substantially central portion in the width direction of the metal strip, the other two are arranged at end portions of the metal strip in the width direction, and is arranged immediately after the cooling roll group so as to face the metal strip. An auxiliary gas cooling device having two or more gas spray nozzle headers in the strip width direction, and at least one of these nozzle headers being movable in the metal strip width direction; A metal band cooling device, comprising: a gas adjusting device for adjusting a cooling gas pressure or a gas flow rate inside these nozzle headers. 11. The metal strip cooling device according to claim 1 or 2, wherein a plurality of cooling rolls are installed, and at least three cooling heads are provided for at least the preceding stage of the cooling rolls. One is arranged at the approximate center of the metal strip in the width direction, and the other two are arranged at the end of the metal strip in the width direction. Arranged at the end portion in the direction, further arranged immediately after the cooling roll group, facing the metal strip,
An auxiliary gas cooling device having two or more gas spray nozzle headers in the width direction of the metal strip, and at least one of the nozzle headers is movable in the metal strip width direction. And a gas adjusting device for adjusting the cooling gas pressure or gas flow rate inside these nozzle headers. 12. The metal band cooling device according to claim 8, wherein at least two nozzle headers at both ends in the metal band width direction of the nozzle header of the auxiliary gas cooling device are arranged in the metal band width direction. The metal band cooling device according to any one of claims 8 to 11, which is movable. 13. A width change connection information device, comprising the configuration of the metal band cooling device according to claim 8 or 11,
A gas cooling device is provided by arranging one or more of the position detectors at both ends of the metal strip and the metal strip width direction plate thermometer on the inlet side of the cooling roll and obtaining information on the width changing portion or the width changing amount based on these information. 2. A metal strip cooling device characterized in that the nozzle header for the widthwise end portion and / or the two nozzle headers at both ends of the auxiliary gas cooling device in the metal strip widthwise direction are respectively set at the end portions in the metal strip widthwise direction. 14. When the metal band cooling device according to any one of claims 8 to 11 is provided, a metal band width direction plate thermometer is arranged on the outlet side of the auxiliary gas cooling device, and based on the information. ,
Nozzle headers for widthwise ends of the gas cooling device and / or two nozzle headers at both ends of the auxiliary gas cooling device in the metal band width direction are set at the ends of the metal band width direction, respectively. . 15. When the metal strip cooling device according to any one of claims 8 to 11 is provided, a metal strip width direction plate thermometer is arranged on the outlet side of the auxiliary gas cooling device, and based on the information. ,
A metal strip cooling device, characterized in that a cooling gas pressure or a gas flow rate of each nozzle header of the gas cooling device and / or each nozzle header of the auxiliary gas cooling device is adjusted. 16. When the metal strip cooling device according to any one of claims 8 to 11 is provided, a metal strip width direction plate thermometer is arranged on the outlet side of the auxiliary gas cooling device, and based on the information. ,
Nozzle headers for the widthwise ends of the gas cooling device and / or two nozzle headers at both ends of the auxiliary gas cooling device in the metal band width direction are set respectively at the ends of the metal band width direction, and cooling gas for each nozzle header is set. A metal strip cooling device characterized by adjusting pressure or gas flow rate. 17. A roll cooling device, in which a metal strip is wound around one or more cooling rolls, and a contact length of the metal strip and each cooling roll is individually adjusted, and the roll cooling device is arranged to face the cooling roll. In addition to having three or more nozzle headers in the roll cylinder length direction, these nozzle headers are movable in the moving direction of the cooling roll, and at least one of these nozzle headers is movable in the roll cylinder length direction. A gas cooling device configured, a position detector for detecting both ends of the metal strip that detects the plate end of the metal strip, and a nozzle header of the nozzle header that is movable in the roll cylinder length direction, is adjusted for movement in the roll cylinder length direction. The movement adjusting device for controlling the movement adjusting device based on the detection signals of the position detectors at both ends of the metal strip, and the position signal for the cooling roll. A forward / backward adjusting device for adjusting the position of the slip header in the cooling roll moving direction, a metal strip width direction plate thermometer for detecting the plate width direction temperature distribution of the metal band, which is arranged on the exit side of the cooling roll, and from this plate thermometer And a plate temperature control calculation device that adjusts the cooling gas pressure or gas flow rate inside each nozzle header according to this temperature deviation. Band cooling device. 18. The metal strip cooling device according to claim 17, which is arranged to face the metal strip immediately after the cooling roll and has three or more nozzles in the plate width direction of the metal strip. An auxiliary gas cooling device having a header and at least one of these nozzle headers being movable in the metal band width direction, and a metal band width direction arranged on the outlet side of the auxiliary gas cooling device. A metal strip cooling device having a plate thermometer. 19. The metal band cooling device according to claim 18, wherein at least two nozzle headers at both ends of the nozzle header of the auxiliary gas cooling device are movable in the metal band width direction. The metal strip cooling device according to claim 18, wherein: 20. The metal band cooling device according to claim 17, wherein the nozzle width Be of the nozzle headers at both ends of the gas cooling device and / or the auxiliary gas cooling device is expressed by the following equations 1 and 2. 20. The metal band cooling device according to claim 17, wherein the relationship of 2 and the nozzle width Bc of the central nozzle header satisfy the relationship of the following equation (3). [Equation 1] [Equation 2] [Equation 3]