Air blower, imaging system, rolling equipment, air blowing method, and imaging method

Abstract

The invention provides an air blower, an imaging system, rolling equipment, an air blowing method and an imaging method, which can restrain fog on a metal band plate compared with the prior art. An air blower (50) is provided with: cross-flow fans (84) provided on both sides of an operation side and a drive side on the outside in the width direction of a metal strip (1) so as to extend from an upstream rolling mill to a downstream rolling mill among a plurality of rolling mills for rolling the metal strip (1); air is exhausted so as to block external air outside the rolling line from entering from the side surface side of the metal strip plate (1) in the width direction; and an air supply unit that supplies air to the cross-flow fan (84).

Description

Technical Field

[0001] The invention relates to an air blower, a photographing system, a rolling device, an air supply method and a photographing method. Background Art

[0002] Patent document 1 records the following: In a process of manufacturing steel plates by a hot rolling mill, there is a shell arranged at an appropriate height position above the travel path of the steel plates, an optical device housed in the shell and irradiating light to the surface of the steel plates to detect reflected light reflected from the surface, and a surface defect detection device that processes a detection signal output by the optical device to detect surface defects. A gap is provided on a sealing surface of the shell opposite to the travel path at a portion that becomes a light path of the optical device, and a shielding plate is provided in the shell in a manner that enables opening and closing of the gap, and the shielding plate is opened only during surface defect inspection.

[0003] Patent document 2 records a defect judgment device, which comprises: a roller, which is arranged with a rotating axis extending along the width direction of the rolled steel plate to lift the rolled steel plate upward; a camera, which captures an image of the lifted area of ​​the rolled steel plate lifted upward by the roller; and a control device, which judges the defect of the plate shape of the rolled steel plate based on the image captured by the camera.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2002-156334

[0007] Patent Document 2: Japanese Patent No. 6808888 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In a hot rolling line, cooling water evaporates on the rolled metal strip during rolling to generate water vapor. When the water vapor condenses to generate mist, when the condition of the metal strip is photographed with a camera, the atmosphere on the metal strip becomes white due to the mist, and it is sometimes difficult to capture the image normally.

[0010] The inventors of the present application studied the cause of the generation of the fog and found the following reason: the air outside the rolling line flows into the rolling line, causing the temperature of the atmosphere on the metal strip to drop, and the amount of saturated water vapor in the atmosphere decreases, so the water vapor condenses and turns into fog.

[0011] As a technology that takes water vapor in the atmosphere on the metal strip plate when capturing images, for example, Patent Document 1 records the following: a camera above the travel path of the steel plate is housed in a housing, a water-cooled heat-insulating plate with slits is provided in the optical path portion of the camera, and air is discharged toward the opening surface of the slit to form an air curtain on the opening surface to prevent the entry of water vapor and the like.

[0012] However, in the technology of the above-mentioned Patent Document 1, the temperature near the housing is lowered in order to protect the camera from heat. Therefore, it is considered that the temperature of the air discharged to the opening surface is also low, causing the temperature of the atmosphere on the metal strip to drop, and normal image shooting becomes difficult due to the generation of fog, so improvement is needed.

[0013] The present invention provides an air blower, a photographing system, a rolling equipment, an air supply method and a photographing method which can suppress the generation of mist on a metal strip plate compared with the past.

[0014] Technical solutions to solve problems

[0015] The present invention includes multiple technical solutions to the above-mentioned problems. As one example, it comprises: an air exhaust section, which is arranged on the operating side and the driving side of the outer side in the width direction of the metal strip in a manner extending along the rolling direction from the rolling mill on the upstream side of multiple rolling mills that roll the metal strip toward the rolling mill on the downstream side, and exhausts air to block external air outside the rolling line from entering from the side side in the width direction of the metal strip; and an air supply section, which supplies air to the air exhaust section.

[0016] Effects of the Invention

[0017] According to the present invention, the generation of mist on the metal strip can be suppressed compared with the related art. Other problems, configurations and effects than those described above will become clear from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram showing a schematic configuration when an example in which the air blowing direction of an air blower of a rolling facility is set downward is viewed from the side, and the rolling facility is provided with an imaging system including the air blower of the present embodiment.

[0019] Figure 2 This is a diagram showing a schematic configuration of a rolling facility provided with an imaging system including an air blower according to the present embodiment when viewed from above.

[0020] Figure 3 This is a diagram showing a schematic configuration of a rolling facility provided with an imaging system including an air blower according to the present embodiment when viewed in the rolling direction.

[0021] Figure 4It is a graph showing the relationship between the atmospheric temperature and the amount of saturated water vapor.

[0022] Figure 5 This is a diagram showing the relationship between theoretical values ​​and experimental values ​​of jet flow characteristics.

[0023] Figure 6 This is a diagram showing an example of the basic structure of the air blower according to the present embodiment.

[0024] Figure 7 This is a diagram showing an example of a specific basic structure of the air blower according to the present embodiment.

[0025] Figure 8 This is a diagram showing a schematic configuration when an example is seen from the side with the air blower of a rolling facility blowing air in an upward direction. The rolling facility is provided with an imaging system including the air blower of the present embodiment.

[0026] Description of Reference Numerals

[0027] 1 Metal strip

[0028] 10, 20 rolling mill stands

[0029] 30 working rolls

[0030] 35 Support Roller

[0031] 40 looper roll

[0032] 50, 50A, 50B air blowers

[0033] 52 Pillars

[0034] 54, 54B wheels

[0035] 55 Setting the surface

[0036] 60 lighting fixtures

[0037] 70 cameras (shooting device)

[0038] 81 Heater (air supply unit, heating unit)

[0039] 82 Motor

[0040] 83 Housing

[0041] 83A Housing with ducts (air supply, air intake duct)

[0042] 84 Cross flow fan (air exhaust part)

[0043] 86, 86A air inlet

[0044] 87 Exhaust port

[0045] 90 Control Device

[0046] 95 Display device

[0047] 100, 100B rolling equipment DETAILED DESCRIPTION

[0048] use Figures 1 to 8 Embodiments of the air blower, the photographing system, the rolling equipment, the air supply method, and the photographing method of the present invention are described.

[0049] Figure 1 This is a diagram showing a schematic structure when an example in which the air blowing direction of the air blower of the rolling equipment is set to the downward direction is viewed from the side. Figure 2 1 is a diagram showing the schematic structure of a rolling equipment when viewed from above. Figure 3 is a diagram showing a schematic structure of a rolling equipment when viewed in the rolling direction, Figure 4 is a graph showing the relationship between the atmospheric temperature and the amount of saturated water vapor. Figure 5 is a graph showing the relationship between theoretical values ​​and experimental values ​​of jet flow characteristics. Figure 6 FIG. 1 is a diagram showing an example of the basic structure of the air blower of this embodiment. Figure 7 FIG. 1 is a diagram showing an example of a specific basic structure of the air blower of the present embodiment. Figure 8 This is a diagram showing a schematic configuration when an example in which the air blowing direction of an air blower of a rolling facility is set upward is viewed from the side, wherein the rolling facility is provided with an imaging system including the air blower of the present embodiment.

[0050] In the drawings used in this specification, the same or corresponding components are denoted by the same or similar reference numerals, and duplicate descriptions of these components may be omitted.

[0051] First, use Figure 1 to Figure 3 The overall structure of the rolling equipment will be described.

[0052] exist Figure 1 to Figure 3 In the present invention, the rolling equipment 100 for rolling the metal strip 1 includes a plurality of rolling mills (in Figure 1 In the figure, for the convenience of illustration, only two rolling mill frames 10, 20 are shown), an air blower 50, a camera 70, a lighting device 60, a loop roller 40 for tension control, a control device 90, a display device 95, etc.

[0053] The imaging system of this embodiment is composed of the necessary air blower 50 and camera 70, and any control device 90 and display device 95. In addition, the rolling equipment 100 is equipped with an imaging system composed of the air blower 50, camera 70, etc., and a plurality of rolling mills (in Figure 1 10 and 20).

[0054] In addition, regarding the rolling equipment 100, it is not limited to Figure 1 The arrangement shown has two rolling mills, but it may be a structure with more than three rolling mills.

[0055] Each rolling mill having the rolling mill stand 10 and the rolling mill stand 20 is provided with a pair of upper and lower work rolls 30, a pair of upper and lower backup rolls 35 that are supported by contacting the work rolls 30, and the like. In addition, a six-stage structure may be provided with intermediate rolls between each work roll and each backup roll. The roll structure of the rolling mill is not limited to the above-mentioned form, and it is sufficient as long as it has at least a pair of upper and lower work rolls.

[0056] The looper roller 40 for tension control is a roller for controlling the line tension applied to the metal strip 1 during rolling, and lifts the metal strip 1 upward in the vertical direction. The looper roller 40 is a roller provided so that its rotation axis extends along the width direction of the metal strip 1, and is provided between each rolling mill having the rolling mill stand 10 and the rolling mill stand 20 as a roller for lifting the metal strip 1 from the vertical bottom to the top.

[0057] In addition, a shape detector of a looper type for detecting the shape of the metal strip 1 may be used instead of the looper roller 40. As the shape detector, a detector of a well-known structure may be used, and the details thereof will be omitted.

[0058] The camera 70 is provided at a position capable of capturing an image including the lifted region of the metal strip 1 lifted upward by the looper roller 40. The camera 70 preferably serves as a subject for executing a capturing step of capturing a reflected light region formed on the surface of the metal strip 1.

[0059] More specifically, the reflected light area formed on the surface of the metal strip 1 is formed near the area lifted by the looper roller 40. When there is an obstacle between the reflected light area and the camera installation position, the reflected light will not reach the camera 70. However, since it is a necessary condition for the camera 70 to shoot the reflected light area, it is necessary to avoid obstacles that hinder the light path. Therefore, the camera 70 is arranged at a position where there is no obstacle between the raised area of ​​the metal strip 1. The data of the image including the lifted area of ​​the metal strip 1 lifted to the upper side by the looper roller 40 captured by the camera 70 is sent to the control device 90.

[0060] The lighting device 60 is a light source that illuminates the lifted shooting area of ​​the metal strip 1 that is lifted upward in the vertical direction by the looper roller 40 and is mainly photographed by the camera 70. A general light source that is appropriately configured on the ceiling of a rolling plant where the rolling equipment 100 is installed may also be used.

[0061] More specifically, the lighting device 60 is sometimes arranged on one side of the width direction of the metal strip 1 with the metal strip 1 sandwiched therebetween, and is arranged to form a reflected light area on the surface of the metal strip 1. However, when there is an obstacle on the optical path, the illumination on the surface of the metal strip 1 is insufficient, and the reflected light area may not be formed, so it is necessary to avoid obstacles blocking the optical path. Therefore, it is desirable to set it at a position where there is no obstacle between the lighting device 60 and the lifted area of ​​the metal strip 1.

[0062] Figure 1 and Figure 2 The air blower 50 shown includes an air discharge part, an air supply part, a support part, etc., and preferably becomes the implementation body of the air supply process, which is to discharge air from the operation side and the drive side of the outer side in the width direction of the metal strip 1 through the air blower 50 extending from the upstream side rolling mill toward the downstream side rolling mill among the plurality of rolling mills that roll the metal strip 1, so as to block the external air outside the rolling line from entering from the side side in the width direction of the metal strip 1. In addition, the "rolling line" in the present invention refers to the three-dimensional space where the metal strip 1 is located.

[0063] The air blower 50 can be retrofitted to existing rolling equipment (in this case, one or more of the lighting device 60 and the camera 70 can be retrofitted together, or the position can be changed), or it can be installed as an initial device in a newly installed rolling equipment.

[0064] The supporting part of the air blower 50 includes a plurality of pillars 52 for supporting the outer shells of the air exhaust part and the air supply part on the upstream and downstream sides in the rolling direction. The pillars 52 may be provided with wheels 54 arranged on the floor setting surface, and may also enable the air exhaust part and the air supply part to be moved in a free direction during maintenance, etc.

[0065] The air discharge portion of the air blower 50 is, for example, a cross flow fan 84 (see Figure 6 etc.), and are respectively arranged on both sides of the outer side in the width direction of the metal strip 1 in a manner extending from the rolling mill frame 10 on the upstream side toward the rolling mill frame 20 on the downstream side among the multiple rolling mills that roll the metal strip 1, and are used to discharge air preferably at a temperature higher than the atmosphere temperature outside the rolling line to block external gas from entering the rolling line from the side side of the metal strip 1.

[0066] like Figure 1 and Figure 2As shown, the air exhaust part separates the gap between the rolling mill frames 10 and 20, and Figure 1 As shown, it is provided above the pass line in the vertical direction and is configured to discharge air from the upper side in the vertical direction of the pass line to the lower side in the vertical direction, thereby suppressing the inflow of external air into the rolling line.

[0067] In addition, if Figure 2 As shown, in the width direction of the rolling line, the air exhaust part is provided outside the outer wall on either the driving side or the operating side of the rolling mill frames 10 and 20. In addition, the air exhaust part does not need to be provided outside the outer wall of the rolling mill frames 10 and 20. Although it is desirable to provide it outside the outer wall of the rolling mill frames 10 and 20 from the viewpoint of installation, it may be provided inside the outer wall of the rolling mill frames 10 and 20 from the viewpoint of installation purpose of suppressing the inflow of external air into the rolling line.

[0068] The air supply section of the air blower 50 supplies air preferably at a temperature higher than the ambient temperature outside the rolling line to the air exhaust section mainly including the cross-flow fan 84, so as to block external gas from entering the rolling line from the side of the width direction of the metal strip 1. It is more preferred to supply air above 100°C to the air exhaust section.

[0069] The purpose of providing the air supply unit is to prevent the temperature of the atmosphere in the rolling line from being cooled by the temperature of the gas that is the supply source, without causing the outside air to flow into the rolling line based on the air supply of the air exhaust unit. By supplying air preferably at a temperature of 100° C. or higher, air at a temperature that can reliably vaporize the cooling water at atmospheric pressure when the cooling water evaporates on the metal strip 1 can be supplied, thereby reliably suppressing the generation of mist. In addition, depending on the environment in which the rolling equipment 100 operates, it may be set to 100° C. or lower, and may be appropriately set according to the environment.

[0070] Below, use Figure 4 The following drawings explain the results of studying the reasons for providing the air blower 50 in the present invention.

[0071] In the system system of the defect judgment device for monitoring defects in plate shape described in Patent Document 2, a reflected light area formed in a band shape in the plate width direction is detected on the surface of the metal strip 1 in the loop roller 40 portion, and the plate shape is determined by measuring the distance distribution of the reflected light area in the rolling direction through image processing. However, in this technology, it is premised on the ability to detect the band-shaped reflected light area, and it is important to suppress the generation of fog which will hinder the optical detection of the reflected light area within the rolling line of the loop roller 40 portion.

[0072] Here, in the hot rolling of the metal strip 1, the temperature of the iron-based metal strip 1 is generally about 900°C. In addition, in the hot rolling of the aluminum-based metal strip 1, the temperature of the metal strip 1 is generally about 400°C.

[0073] That is, the metal strip 1 is a high-temperature heat source. However, despite the presence of a high-temperature heat source, water vapor condenses in the looper roll 40 portion, generating mist. The reason for this is that the amount of moisture present exceeds the saturated water vapor amount of the atmospheric temperature in the rolling line of the looper roll 40 portion, generating mist.

[0074] When the atmosphere temperature is T [°C], the saturated water vapor pressure e(T) [hPa] can be expressed as the following formula (1) based on the Tetens equation.

[0075] e(T)=6.1078×10^{7.5T / (T+237.3)} … (1)

[0076] In addition, the saturated water vapor volume a(T)[g / m 3 ] can be expressed as the following formula (2).

[0077] a(T)=217e(T) / (T+273.15) … (2)

[0078] When the equation (2) is represented by a curve graph, Figure 4 shown.

[0079] According to the above formula (2), if the amount of moisture present in the looper roll 40 portion does not exceed the saturated water vapor amount of the atmosphere, the generation of mist can be prevented. As a countermeasure for this, two methods are conceivable.

[0080] The first method is to reduce the moisture content of the looper roll 40 so that the moisture content does not exceed the saturated water vapor content.

[0081] The second method is to increase the saturated water vapor amount by raising the temperature of the atmosphere in the looper roll 40 portion so that the moisture amount does not exceed the saturated water vapor amount.

[0082] However, it is considered difficult to reduce the moisture content of the cooling water during rolling in the rolling operation, so a second method of preventing the generation of mist is adopted, that is, raising the atmospheric temperature of the looper roll 40 portion to increase the saturated water vapor amount.

[0083] Regardless of the presence of a high-temperature heat source of the hot-rolled sheet, the main reason for the decrease in the atmospheric temperature in the rolling line at the looper roll 40 portion is that the low-temperature air outside the rolling line flows into the rolling line at the looper roll 40 portion, and there is a high possibility that the atmospheric temperature decreases. Therefore, the countermeasure is taken in such a way that the air outside the rolling line does not flow into the rolling line.

[0084] In such Figure 1 to Figure 3 In the rolling mill 100 shown, measures are taken to prevent the generation of mist in the looper roll 40 portion of the rolling line provided between the rolling mills having the rolling mill stands 10 and 20 .

[0085] The looping roller 40 is partially arranged in the middle position between the rolling mill (having the rolling mill frame 10) on the upstream side of the rolling direction and the rolling mill (having the rolling mill frame 20) on the downstream side. Therefore, it is considered that the rolling mill itself becomes a barrier and almost no external air enters from the upstream and downstream sides of the rolling direction.

[0086] On the other hand, it is assumed that there is no barrier in the direction (width direction) perpendicular to the line center of the looper roll 40, and the outside air easily enters the rolling line. It is considered that if the outside air can be prevented from entering the rolling line from the direction perpendicular to the line center, the condensation of water vapor caused by the decrease in the atmospheric temperature in the rolling line can be prevented, and the generation of mist can be suppressed.

[0087] So, if Figure 1 and Figure 2 As shown, it is conceived to set a horizontally long air blower 50 in a manner to cover the gap between the side portions in the width direction of the rolling line between two rolling mills having an upstream rolling mill stand 10 and a downstream rolling mill stand 20, and to generate high-temperature air above the atmosphere temperature outside the rolling line preferably vertically downward or upward based on the same principle as the air curtain, so as to prevent external air with a temperature lower than the atmosphere temperature inside the rolling line from entering the rolling line.

[0088] The air flow sent from the air blower 50 needs to reach the pass line from the installation position of the air blower 50. Therefore, when the wind speed at the pass line position is set to be 1 m / s or more, the center speed Uc of the air flow can be obtained from Figure 5 The following relationship is derived from the experimental values ​​of .

[0089] When the outlet of the air blower 50 is positioned at a height h of 2 m from the passing line and the thickness B of the outlet is set to 66 mm, h / B=30 is approximately obtained.

[0090] according to Figure 5 The value obtained by dividing the center velocity Uc of the jet flow at this time by the outlet wind velocity Uc1 is approximately Uc / Uc1=0.38.

[0091] Therefore, when the center velocity Uc of the airflow at the position of the passing line is 1 m / s, the outlet wind velocity Uc1 is approximately Uc1 = Uc / 0.38 = 1 / 0.38 = 2.6 m / s.

[0092] It should be noted that in the system of the defect judgment device described in Patent Document 2, the reflected light area formed in a strip shape in the width direction is detected on the surface of the metal strip 1 at the looper roller 40 portion, and the shape change of the strip can be monitored, such as Figure 3 As shown, sometimes the looper roller 40 portion is photographed with a camera 70, and illumination light is irradiated to the looper roller 40 portion from an illumination device 60. Therefore, it is required to determine the installation height of the air blower 50 so as not to become an obstacle to the illumination light and the camera 70 shooting.

[0093] according to Figure 3 , it is required that the distance C (=h) from the passing line to the blowing outlet of the air blower 50 is greater than the lower limit position D and greater than the lower limit position E. With respect to the lower limit position D, when the air blower 50 is installed at a position of a distance A from the center of the line to the installation position of the air blower 50, the air blower 50 will not become an obstacle to the lighting device 60. With respect to the lower limit position E, when the air blower 50 is installed at a position of a distance A, the air blower 50 will not become an obstacle to the shooting of the camera 70.

[0094] The distance A from the line center to the installation position of the air blower 50 is set to a position outside the outer wall of the rolling mill frames 10 and 20 from the line center. However, it is desirable that the distance A at which the air blower 50 is installed is as close to the outer wall of the rolling mill frames 10 and 20 as possible.

[0095] exist Figure 3 2 shows a case where the distance C from the passing line to the blowing port of the air blower 50 is the same on both sides of the metal strip 1, but it may be different.

[0096] like Figure 6 As shown, the air blower 50 is Figure 1 In addition to the support portion shown in the figure, a heater 81, a motor 82, a housing 83, a cross flow fan 84 (air exhaust portion), etc. are also provided.

[0097] The heater 81 is a device that heats the air taken in from the air inlet 86 and is a part of the air supply unit.

[0098] The housing 83 is a frame that accommodates the heater 81 on the upstream side of the air flow path and the cross flow fan 84 on the downstream side. It has an air inlet 86 and an exhaust port 87. The air inlet 86 is arranged on the upper side of the through-line in the vertical direction to allow the ambient air in the rolling line to enter, and the exhaust port 87 discharges the air heated by the heater 81 and discharged from the cross flow fan 84.

[0099] The cross flow fan 84 is a cylindrical fan having a plurality of blades on a cylindrical shape, and is configured to take in air in its radial direction and blow the taken-in air in different radial directions. The cross flow fan 84 is driven by a motor 82. In addition, the air discharge portion is not limited to the cross flow fan 84, and a propeller fan, a blower, etc. can be used.

[0100] The air blower 50 is not limited to Figure 6 The following uses Figure 7 and Figure 8 Air blowers 50A and 50B according to modified examples will be described.

[0101] like Figure 7 As shown, the air blower 50A and Figure 6 The air blower 50 shown is different except that Figure 1 In addition to the support portion shown in the figure, the motor 82, the casing 83A with a duct, the cross-flow fan 84 (air exhaust portion), etc. are also provided.

[0102] Figure 7 The air blower 50A shown does not include the heater 81, and the air inlet 86A is extended vertically above the passing line to suck in the air above the metal strip 1 which is hotter than the metal strip 1 which normally has a temperature exceeding 400 degrees.

[0103] In addition, the housing 83A with ducts is configured to guide the air taken in from the air inlet 86A to the cross flow fan 84, and the exhaust port 87 discharges the air above the metal strip 1 which has become high temperature. In this case, the housing 83A and the cross flow fan 84 are made of a material with high thermal conductivity such as aluminum, so that the temperature of the air blower 50 itself can be kept high, and the high temperature air can be exhausted efficiently.

[0104] In addition, Figure 7 In the figure, an example is given of a situation in which the air above the metal strip plate 1, which has a higher temperature than the metal strip plate 1, is sucked in when the air blower discharges the air in a vertical direction downward. However, the air sucked in at the air inlet is not limited to the air above the metal strip plate 1, but may also be the air vertically below the metal strip plate 1, to the side, or in any two or more of these three locations.

[0105] Figure 8 The air blower 50B in the rolling equipment 100B shown is the same as the air blowers 50 and 50A in terms of including an air exhaust part, an air supply part, a support part, etc., but unlike the air blowers 50 and 50A, it is constructed to discharge air from the vertically lower side to the vertically upper side of the metal strip 1.

[0106] The support portion of the air blower 50B includes wheels 54B for moving the air discharge portion and the air supply portion on the installation surface 55 in a free direction.

[0107] The above-mentioned air exhaust part is mainly composed of a cross-flow fan 84, which is respectively arranged on the two outer sides in the width direction of the metal strip 1 in a manner extending from the rolling mill frame 10 on the upstream side toward the rolling mill frame 20 on the downstream side among the multiple rolling mills that roll the metal strip 1, and discharges air preferably above the atmosphere temperature outside the rolling line to block external air from entering the rolling line from the side side of the metal strip 1. This and other structures are basically the same as the air blower 50 or the air blower 50A.

[0108] In addition, in Figure 8 In the structure shown in FIG. 1 in which air is discharged from the vertical lower side of the metal strip 1 to the vertical upper side, the air supply unit may be replaced with the heater 81 by a heater as shown in FIG. Figure 7 The method shown is to inhale the air above the metal strip 1 which is higher in temperature than the metal strip 1, or to inhale the air heated by the metal strip 1 from the vertical bottom, side or any one of the three parts of the metal strip 1.

[0109] return Figure 1 The control device 90 is a device for controlling the operation of each device in the rolling equipment 100. In this embodiment, in particular, the control device 90 detects the distance distribution in the rolling direction of the reflected light area formed on the surface of the metal strip 1 described in Patent Document 2 based on the image captured by the camera 70, thereby judging the defective plate shape of the metal strip 1 being rolled and performing various controls corresponding to the state of occurrence of the defective plate shape. These operations can maintain a fog-free atmosphere, so the aforementioned reflected light area can be detected and the aforementioned various controls can be performed.

[0110] The display device 95 is a display device such as a display, an alarm, an audio device, etc. For example, it is a device for informing the operator of the occurrence of a bad plate shape and / or its handling operation when the control device 90 determines that the plate shape is bad. Therefore, as such a display device 95, a display or a monitor is often used.

[0111] During the rolling operation, the operator checks whether there is a defective plate shape by watching the display screen of the display device 95. For example, when the display device 95 shows a defective plate shape such as intermediate corrugation, the operator manually intervenes to operate each actuator according to the response instruction, thereby restoring the metal strip from the defective plate shape state to a good state.

[0112] Furthermore, the method is not limited to informing the operator of the defective plate shape, and may be a method in which the control device 90 automatically intervenes to correct the defective plate shape while displaying the defective plate shape, or a method in which the correction intervention operation is automatically performed without displaying the defective plate shape.

[0113] Next, the effects of this embodiment will be described.

[0114] The air blowers 50, 50A, 50B of the present embodiment described above comprise: an air exhaust section, which is arranged on both sides of the operation side and the drive side on the outside in the width direction of the metal strip 1 in a manner extending from the upstream rolling mill toward the downstream rolling mill among the multiple rolling mills that roll the metal strip 1, and exhausts air to block external air outside the rolling line from entering from the side sides in the width direction of the metal strip 1; and an air supply section, which supplies air to the air exhaust section.

[0115] By forming such an air curtain between the rolling mills arranged in series, the outside air does not enter the rolling line, and the temperature of the atmosphere in the rolling line is difficult to decrease due to the temperature of the air curtain, so that the temperature can be maintained at a high state to avoid the decrease of the saturated water vapor content of the atmosphere, and water vapor is not easy to condense on the metal strip 1, so the generation of fog can be reduced. Therefore, in the case of a system using the defect judgment device described in Patent Document 2, it is possible to reliably capture an image of the reflected light area formed on the surface of the metal strip 1, and accordingly, it is possible to more accurately and reliably judge the abnormality of the plate shape of the metal strip being rolled.

[0116] In addition, air above the atmosphere temperature outside the rolling line is discharged through the air discharge part, so that the temperature of the atmosphere inside the rolling line is difficult to decrease due to the temperature of the air curtain. Therefore, a high temperature state can be maintained and the situation causing the saturated water vapor content of the atmosphere to decrease can be further suppressed, making it more difficult for water vapor to condense on the metal strip 1.

[0117] Furthermore, air at a temperature above 100° C. is supplied to the air exhaust portion through the air supply portion, thereby supplying air at a temperature above that at which the cooling water can be effectively vaporized under atmospheric pressure when it evaporates on the rolling line. Therefore, even if a cold atmosphere flows in from outside the rolling line, it can be expected that the high temperature of the air can be heated to a temperature at which the generation of fog is likely to be suppressed, thereby further suppressing the generation of fog.

[0118] In addition, the air exhaust part is arranged on both sides of the width direction of the metal strip 1 in the rolling direction outside the outer wall of the frames of the two rolling mills, thereby forming a space in the upper space of the metal strip 1 between the two rolling mills on the upstream and downstream sides that is difficult to generate fog.

[0119] Furthermore, there is also a shell 83 with air inlets 86, 86A and exhaust ports 87. The shell 83 accommodates an air supply part on the upstream side of the air flow path and accommodates an air exhaust part on the downstream side, thereby minimizing the possibility of exhausting low-temperature air other than that supplied by the air supply part from the air exhaust part, and can more effectively function as a high-temperature air curtain.

[0120] Furthermore, since the air supply unit includes the heater 81 that heats the air taken in from the air inlet 86 , air having a temperature higher than the ambient temperature outside the rolling line can be reliably discharged.

[0121] Furthermore, an air inlet 86A is arranged around the metal strip 1 to inhale air above the temperature of the atmosphere outside the rolling line after being heated by the metal strip 1. The air supply part includes a shell 83A with a duct that guides the air taken in from the air inlet 86A to the air exhaust part. Thus, the high-temperature air of the atmosphere on the metal strip 1 is directly taken in, and there is no need to prepare a heat source separately.

[0122] Furthermore, since the air discharge portion is the cross-flow fan 84 , uniform air discharge in the rolling direction can be easily achieved.

[0123] In addition, Figure 8 In the process, the air discharge part is arranged below the metal strip 1 in the vertical direction and discharges air toward the upper vertical direction. Therefore, the air can be supplied from the side closer to the metal strip 1 where the reflected light area is formed. The wind speed near the metal strip 1 is close to the initial speed of the air discharge part. Therefore, the wind speed is relatively fast, which can effectively prevent the external air from entering the rolling line from the side of the rolling line, and can effectively prevent the atmosphere temperature in the rolling line from decreasing. Therefore, it can be constructed to effectively prevent the saturated water vapor content of the atmosphere from decreasing, and it is more difficult to cause fog.

[0124] Furthermore, according to the shooting system comprising air blowers 50, 50A, 50B arranged on both sides of the rolling line in the width direction and a camera 70 arranged on either side of the width direction of the metal strip 1 and used to shoot the reflected light area formed on the surface of the metal strip 1, since there is no obstruction of the optical path due to fog, clear shooting of the reflected light area can be performed at a higher frequency.

[0125] In addition, in a rolling equipment 100 having a photographing system and multiple rolling mills that roll a metal strip 1, in the case of a system that adopts the defect judgment device described in patent document 2, the generation of fog in the atmosphere is suppressed, and the reflected light area can be photographed more reliably during rolling than before. Therefore, the plate shape abnormality can be judged more accurately and reliably, the occurrence of abnormalities can be discovered quickly and with a higher probability, and the rolling equipment can be set to be able to deal with rolling defects more appropriately.

[0126] <Other>

[0127] The present invention is not limited to the above-described embodiments, and various modifications and applications are possible. The above-described embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not limited to necessarily having all the described configurations.

Claims

1. An air blower, characterized in that: have: An air exhaust portion, which is respectively provided on both sides of the operation side and the drive side of the outer side in the width direction of the metal strip in a manner extending from the rolling mill on the upstream side of a plurality of rolling mills rolling the metal strip toward the rolling mill on the downstream side along the rolling direction, and exhausts air to block the external air outside the rolling line from entering from the side side in the width direction of the metal strip; and An air supply unit supplies air to the air discharge unit.

2. The air blower according to claim 1, characterized in that: The air discharge portion discharges air having a temperature higher than that of the atmosphere outside the rolling line.

3. The air blower according to claim 1, characterized in that: The air supply unit supplies the air at a temperature of 100° C. or higher to the air discharge unit.

4. The air blower according to claim 1, characterized in that: The air discharge portion is provided outside the outer wall of the frames of the plurality of rolling mills in the width direction of the metal strip.

5. The air blower according to claim 1, characterized in that: Also provided is a housing having an air inlet and an air outlet, The housing accommodates the air supply unit on the upstream side of the air flow path, and accommodates the air discharge unit on the downstream side.

6. The air blower according to claim 5, characterized in that: The air supply unit includes a heating unit that heats the air taken in from the air inlet.

7. The air blower according to claim 5, characterized in that: The air inlet is arranged around the metal strip to inhale the air heated by the metal strip. The air supply portion includes an air intake duct that guides the air taken in from the air intake port to the air discharge portion.

8. The air blower according to claim 1, characterized in that: The air discharge part is a cross-flow fan.

9. The air blower according to claim 1, characterized in that: The air discharge portion is provided below the metal strip in the vertical direction, and discharges the air upward in the vertical direction.

10. A shooting system, characterized in that: have: The air blower according to any one of claims 1 to 9; and A photographing device is provided on either side of the width direction of the metal strip and is used to photograph a reflected light area formed on the surface of the metal strip.

11. A rolling equipment, characterized in that: have: The photographing system of claim 10; and A plurality of rolling mills are provided for rolling the metal strip.

12. An air supply method, characterized in that: An air blower extending along the rolling direction from the rolling mill on the upstream side toward the rolling mill on the downstream side among the multiple rolling mills rolling the metal strip discharges air on both the operating side and the driving side on the outside in the width direction of the metal strip to block external air outside the rolling line from entering from the side side in the width direction of the metal strip.

13. A shooting method, characterized in that: include: an air supply step of discharging the air by the air supply method according to claim 12 to block the external air outside the rolling line from entering from the side of the metal strip in the width direction; and The photographing step is to photograph a reflected light area formed on the surface of the metal strip.

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