JP2024042196A - Monitoring system and method - Google Patents

Abstract

[Problem] To provide a monitoring system and a monitoring method that can monitor abnormalities in the rolls and the cooling device without stopping the rolls, and can also detect abnormalities in the cooling device at an early stage. [Solution] The monitoring system 1 monitors the rolls 2 to which heat is transferred from the hot material and which is cooled by the cooling device 3, and includes a photographing device 6 that takes a thermal image of the rolls 2, and a monitoring device 7 that monitors abnormalities in the cooling device 3 based on the thermal images taken by the photographing device 6. [Selected Figure] Figure 1

Description

The present invention relates to a monitoring system and a monitoring method, and particularly to a monitoring system and a monitoring method for monitoring a roll that receives heat from a hot material and is cooled by a cooling device.

A variety of rolls are used on production lines at steel plants. Examples of the roll include a conveyance roll that conveys a hot steel plate (hereinafter referred to as hot material), a rolling roll that rolls the hot material, and the like. This type of roll is mainly composed of metal materials, so when it receives heat from the hot material and its temperature rises, it becomes soft or its strength decreases, causing it to wear more easily, or causing scratches on the surface of the roll. Abnormalities may occur. Therefore, a cooling device is provided near the rolls to cool the rolls by, for example, spraying cooling water onto the rolls.

Patent Document 1 describes an example of a device that monitors roll abnormalities. The device includes a camera that photographs the surface of the roll, and is configured to detect defects on the surface of the roll based on the image taken by the camera. Further, Patent Document 2 describes a method for monitoring the surface properties of a mill roll, which monitors wear of the mill roll using a roll rotation speed meter or a plate thickness measuring device.

Japanese Patent Application Publication No. 11-160243 Japanese Unexamined Patent Publication No. 2-255207

Since the device described in Patent Document 1 monitors defects, wear, etc. on the surface of the roll, it cannot monitor abnormalities in the roll cooling device that may cause defects, wear, etc. on the surface of the roll. . Therefore, in order to discover an abnormality in the cooling device, it is necessary to inspect the cooling device of each roll one by one. In addition, since a huge number of rolls are installed on the production line of a steelworks, inspection of the cooling device requires a great deal of effort. Furthermore, in consideration of the safety of the worker who inspects the cooling device, inspection of the cooling device is limited to when the rolls are stopped, that is, when conveyance or rolling of hot material by the rolls is stopped. Therefore, there is a possibility that an abnormality in the cooling device cannot be detected early. Note that even the monitoring method described in Patent Document 2 has problems similar to those described above.

The present invention has been made to solve the above problems, and it is possible to monitor abnormalities in the rolls and cooling equipment without stopping the rolls, and to discover abnormalities in the cooling equipment at an early stage. The purpose is to provide a monitoring system and method.

In order to achieve the above objects, the present invention has the following features:
[1] A monitoring system that monitors a roll to which heat is transferred from a hot material and is cooled by a cooling device, comprising: a photographing device that photographs a thermal image of the roll; and a photographing device that photographs a thermal image of the roll; A monitoring system comprising: a monitoring device that monitors abnormalities in the cooling device based on images.
[2] The monitoring device estimates the temperature of the roll based on the thermal image, and determines that there is an abnormality in the cooling device when the estimated temperature of the roll exceeds a preset reference temperature. The monitoring system according to [1] above.
[3] The cooling device is disposed below the roll, and is provided at a predetermined interval from a pipe extending in the axial direction of the roll through which cooling fluid flows, in the axial direction of the pipe. and a plurality of supply units that supply the cooling fluid to the roll, and the monitoring device determines that there is an abnormality in the supply unit located below a portion of the roll where the temperature exceeds the reference temperature. The monitoring system according to [2] above.
[4] The monitoring device detects whether or not the roll is in contact with the hot material, and if the roll is not in contact with the hot material, the temperature of the roll is within the reference temperature. The monitoring system according to [2] above, which determines whether or not.
[5] The monitoring device according to any one of [1] to [4] above, further comprising a notification unit that reports an abnormality in the cooling device when it is determined that there is an abnormality in the cooling device. Monitoring system.
[6] The monitoring system according to [1] above, wherein the photographing device photographs the thermal image over the entire length of the roll in the axial direction of the roll.
[7] The roll according to [1] above, wherein the roll is at least one of a transport roll constituting a transport conveyor that transports the hot material and a rolling roll that rolls the hot material. Monitoring system.
[8] A monitoring method for monitoring a roll to which heat is transferred from a hot material and cooled by a cooling device, comprising a photographing step of photographing a thermal image of the roll, and a thermal image photographed in the photographing step. a monitoring step of monitoring, in the monitoring step, the temperature of the roll is specified based on the thermal image, and when the specified temperature of the roll exceeds a preset reference temperature, A monitoring method for determining that there is an abnormality in the cooling device.

According to the present invention, since abnormalities in the cooling device are monitored based on a thermal image of the roll photographed by a photographing device, there is no need to stop the roll. Furthermore, since the cooling device can be constantly monitored, abnormalities in the cooling device can be discovered at an early stage.

1 is a diagram showing an example of a monitoring system according to the present invention. 3 is a flowchart showing an example of control executed by the monitoring system according to the present invention. It is a figure showing an example of image data.

Embodiments according to the present invention will be described below. FIG. 1 is a diagram showing an example of a monitoring system according to the present invention. A monitoring system 1 shown in FIG. 1 monitors an abnormality in a cooling device 3 that cools a roll 2 by monitoring an abnormality in a roll 2 that conveys a hot steel plate (not shown, hereinafter referred to as hot material). is configured to do so.

Hot material refers to materials such as steel plates and steel pipes that are heated to a predetermined temperature (for example, about 850° C. to 1200° C.). Examples of the rolls 2 include a plurality of conveyor rolls that constitute a conveyor that conveys the hot material toward a predetermined location, a rolling roll that rolls the hot material to a preset thickness, and the like. .

The transport conveyor may be, for example, a conventionally known roller conveyor. The conveyor is composed of a plurality of conveyor rolls, and the conveyor rolls are composed of a drive roll and a driven roll. The drive roll is configured to rotate in response to torque generated by a drive power source (not shown). The rotation of the drive roll applies a moving force to the hot material in contact with the drive roll along the conveyor. The drive power source may be, for example, a motor and is coupled to the drive roll in a torque transmitting manner. The driven roll is a roll called a free roll, and the hot material is placed on the driven roll. When a moving force is applied to the hot material by the above-mentioned drive roll and the hot material moves, the driven roll in contact with the hot material is rotated by the hot material.

It is preferable that each roll such as a conveyance roll or a rolling roll is made of iron or an iron alloy in terms of strength or rigidity. These rolls are heated as heat is inevitably transferred from the hot material during the process of conveying or rolling the hot material. Therefore, a cooling device 3 is provided to cool each roll. This is to avoid this, as when the temperature of each roll increases, each roll becomes soft or its strength decreases, making it more likely to wear out, and abnormalities such as scratches may occur on the surface of each roll, so avoid this. It's for a reason. Hereinafter, a case where the roll 2 cooled by the cooling device 3 is a conveyance roll will be described as an example.

Although details are not shown, the plurality of rolls 2 are arranged parallel to each other and spaced apart at regular intervals. In the example shown in FIG. 1, a cooling device 3 is provided below the roll 2.

In the example shown in FIG. 1, the cooling device 3 is a water-cooled cooling device. The cooling device 3 includes a plurality of pipes 4. Each pipe 4 is disposed below each roll 2 and extends in the axial direction of the roll 2. Further, the pipes 4 are arranged parallel to each other and spaced apart from each other at regular intervals. One end of each pipe 4 is closed to maintain a liquid-tight state. The other end of each pipe 4 is connected to a source of cooling fluid (not shown). A supply hole 5 for supplying cooling fluid to the roll 2 is formed on the upper side of each pipe 4 so as to pass through the roll 2 in the thickness direction. The supply holes 5 are formed at regular intervals in the axial direction of the pipe 4. Note that each supply hole 5 may be provided with a nozzle. The cooling fluid may be, for example, industrial water (hereinafter referred to as industrial water). The supply hole 5 described above corresponds to the supply section of the present invention.

A camera 6, which corresponds to the photographing device of the present invention, is installed above the roll 2. Specifically, the camera 6 is installed in a position where it does not come into contact with the hot material being transported by the transport conveyor and where it can photograph the entire length of the roll 2. It is preferable that the camera 6 is installed in a position where it can photograph multiple rolls 2 at once. As an example, the camera 6 is a thermo camera, which continuously or intermittently photographs thermal imaging data (hereinafter simply referred to as image data) of the surface of the roll 2. In this embodiment, the camera 6 continuously photographs image data of the surface of the roll 2 while the transport conveyor is in operation. The thermal imaging data photographed by the camera 6 corresponds to the thermal image of the present invention.

A monitoring system 1 shown in FIG. 1 is provided with a monitoring device 7 that determines an abnormality in the cooling device 3 based on image data captured by a camera 6. The monitoring device 7 is mainly composed of a microcomputer, and performs calculations based on pre-stored data, calculation formulas, and acquired data, and outputs the calculation results as output data and control command signals. is configured to print. In the example shown in FIG. 1, image data taken by a camera 6 is input to a monitoring device 7. The monitoring device 7 also includes a monitor 8, a determining unit 9 that estimates the temperature of the roll 2 based on image data and determines whether there is an abnormality in the cooling device 3, and a determining unit 9 that determines that there is an abnormality in the cooling device 3. It has a notification section 10 that notifies the surroundings of the abnormality when the abnormality occurs.

The monitor 8 may be a conventionally known monitor. Image data taken by the camera 6 is displayed on the monitor 8. The notification unit 10 is configured to notify the surroundings, specifically, an operator, of an abnormality in the cooling device 3 by, for example, voice, sound, light, or vibration. Further, the notification unit 10 may be configured to display the determination result of the abnormality of the cooling device 3 by the determination unit 9 on the monitor 8.

In the conveyor having the above-described configuration, when the hot material is conveyed, the temperature of each roll 2 increases as it receives heat from the hot material. Therefore, at least while the hot material is being transported by the transport conveyor, cooling fluid is supplied to each roll 2 by the cooling device 3 to cool each roll 2. In the example shown in FIG. 1, a pipe 4 is arranged below the roll 2, and a plurality of supply holes 5 are provided above the pipe 4. Therefore, the industrial water is sprayed from each supply hole 5 toward the outer circumferential surface located below the roll 2. Thereby, the roll 2 is cooled over its entire length.

FIG. 2 is a flowchart for explaining an example of control executed by the monitoring device 7 of the monitoring system 1 according to the present invention. The control example shown in FIG. 2 is repeatedly executed at predetermined short time intervals during operation of the conveyor. In the control example shown in FIG. 2, first, the determination unit 9 determines whether hot material is being conveyed by the conveyor (step S1). That is, it is determined whether the roll 2 to be monitored is in contact with the hot material. This can be done, for example, by providing a position sensor (not shown) on the transport conveyor and using the position sensor to detect the presence or absence of hot material on the transport conveyor. Alternatively, this may be done by detecting the current value for the drive roll. If the determination in step S1 is affirmative, the hot material is being conveyed by the conveyor, and image data of the roll 2 cannot be photographed. In addition, while the roll 2 is in contact with the hot material, the influence of the heat that the roll 2 receives from the hot material is higher than the influence of the cooling that the roll 2 receives from the cooling device 3, so the roll 2 and the cooling device It is difficult to detect abnormality 3. Therefore, the determination in step S1 is repeatedly executed until a negative determination is made in step S1.

On the other hand, if the determination in step S1 is negative, it is determined whether the temperature of each roll 2 is within the reference temperature based on the image data of the roll 2 photographed by the camera 6. (Step S2). This is done by detecting the presence or absence of data exceeding the reference temperature in the image data. FIG. 3 is a diagram showing an example of image data. As shown in FIG. 3, the image data is data indicating the temperature distribution of each roll 2, and the temperature of each roll 2 is specified based on the image data. Then, the estimated temperature of the roll 2 and the reference temperature are compared. If there is a portion of the roll 2 whose temperature exceeds the reference temperature or if the temperature of the roll 2 exceeds the reference temperature over the entire length of the roll 2, a negative determination is made in step S2. Note that if there is a portion of the roll 2 that exceeds the reference temperature, the portion appears in a streaky manner as shown in FIG. 3 . Moreover, when the temperature of the roll 2 exceeds the reference temperature over the entire length of the roll 2, the relevant portion appears on the entire roll 2 as shown by dots in FIG. Note that the step of photographing the rolls 2 with the camera 6 corresponds to the photographing step of the present invention, and the step of determining whether the temperature of each roll 2 is within the reference temperature based on the image data corresponds to the photographing step of the present invention. This corresponds to the monitoring process.

The reference temperature is, for example, the upper limit of the temperature of the roll 2 at which the roll 2 can be used without reducing its durability, and can be set in advance based on the material of the roll 2 and experiments. In this embodiment, the reference temperature is 100 degrees Celsius, for example. In the image data, if there is no data exceeding the reference temperature, that is, if the temperature of each roll 2 is within the reference temperature, an affirmative determination is made in step S2. In that case, the process returns to step S1.

If the determination in step S2 is negative, the determining unit 9 specifies the position of the supply hole 5 corresponding to the portion of the roll 2 that exceeds the reference temperature (step S3). As described above, since the supply holes 5 are located below each roll 2, the supply holes 5 located below the portion of the roll 2 exceeding the reference temperature can be identified based on the image data. Specifically, if it is determined in step S2 that there is a portion of the roll 2 that exceeds the reference temperature, there is an abnormality in the supply hole 5 located below the portion that exceeds the reference temperature. It is determined that this is occurring. Also, a case will be described in which the temperature of any one of the rolls 2 exceeds the reference temperature over the entire length of the rolls 2. In this case, it is determined that an abnormality has occurred in the cooling device 3 of the roll 2, that is, in the pipe 4 located below the roll 2, or in the supply hole 5 formed in the pipe 4.

Next, the judgment result in step S3 described above is input from the judgment section 9 to the notification section 10, and the notification section 10 notifies the operator of the abnormality in the cooling device 3 (step S4). Note that when the notification unit 10 notifies the operator of an abnormality in the cooling device 3 by voice, sound, light, vibration, etc., the supply hole 5 identified in step S3 may be displayed on the monitor 8. After that, this flow is temporarily ended.

In this manner, in the monitoring system 1 having the above-described configuration, by monitoring each roll 2 based on the image data of each roll 2, it is possible to discover an abnormality in the cooling device 3 that cools each roll 2. In addition, since abnormalities in the cooling device 3 are monitored based on the temperature of the roll 2, it is possible to pinpoint the abnormality in the cooling device 3, and to promptly carry out maintenance such as inspection and repair for the abnormality. It can be performed. Further, when there is no hot material on the conveyor within the range monitored by the camera 6, it is determined whether the temperature of the roll 2 is within the reference temperature. Therefore, even when the hot material is being conveyed by the conveyor, in other words, the cooling abnormality of the roll 2 and the abnormality of the cooling device 3 can be monitored without stopping the conveyance of the hot material by the conveyor. be able to.

Note that the present invention is not limited to the embodiments described above. In the embodiment described above, the presence or absence of a cooling abnormality of the roll 2, that is, the presence or absence of an abnormality in the cooling device 3 is determined by the monitoring device 7, but instead of this, the presence or absence of an abnormality in the cooling device 3 may be determined by a person. In this case, in the flowchart shown in FIG. 2, the judgments in step S1 and step S2 are made manually. For example, image data, that is, temperature distribution and maximum temperature of each roll 2, is displayed on the monitor 8, and the image data displayed on the monitor 8 is monitored by a person. Then, when the hot material is not being transported and the surface temperature (maximum temperature) of the roll 2 exceeds a predetermined reference temperature, a person determines that there is an abnormality in the cooling device 3. When it is determined that there is an abnormality in the cooling device 3, maintenance such as inspection and repair of the cooling device 3 is performed.

In addition, in the above-mentioned embodiment, the monitoring system 1 according to the present embodiment has been explained by taking the transport roll 2 of the transport conveyor as an example, but the monitoring system 1 is not limited to the transport roll 2, and may include rolling rolls used in a manufacturing line of a steel mill, etc. Other roles may also be used. Furthermore, the cooling device 3 is not limited to a spray type that injects cooling fluid or an external cooling type. For example, it may be an internal cooling type cooling device that cools the roll 2 by forming a cooling fluid flow path inside the roll 2 and causing the cooling fluid to flow through the flow path. In place of industrial water, oil, air, or the like may be used as the cooling fluid. Furthermore, in the embodiment described above, the abnormality of the cooling device 3 is determined based on whether the surface temperature of the roll 2 is within the reference temperature, but instead of this, the temperature difference between a plurality of rolls 2 is monitored, and the temperature It may be configured such that it is determined that there is an abnormality in the cooling device 3 when the difference exceeds a threshold value. Alternatively, the temperature difference between a portion of the roll 2 that is higher in temperature than other portions and a portion of the other portion that is lower in temperature is monitored, and when the temperature difference exceeds a threshold, the cooling device 3 may be determined to be abnormal.

1 Monitoring system 2 Roll 3 Cooling device 4 Pipe 5 Supply hole (an example of a supply unit)
6. Camera (an example of a photographing device)
7 Monitoring device 8 Monitor 9 Determination unit 10 Notification unit

Claims (8)

A monitoring system that monitors a roll to which heat is transferred from a hot material and is cooled by a cooling device, the monitoring system comprising:
a photographing device that photographs a thermal image of the roll;
a monitoring device that monitors abnormalities in the cooling device based on the thermal image taken by the imaging device;
A monitoring system equipped with the monitoring device estimates a temperature of the roll based on the thermal image, and determines that an abnormality exists in the cooling device when the estimated temperature of the roll exceeds a preset reference temperature.
The monitoring system of claim 1 . The cooling device is disposed below the roll, and is provided at a predetermined interval in the axial direction of the pipe from a pipe through which the cooling fluid extends in the axial direction of the roll. a plurality of supply units that supply the cooling fluid to the rolls;
The monitoring device determines that there is an abnormality in a supply section located below a portion where the temperature of the roll exceeds the reference temperature.
The monitoring system according to claim 2. The monitoring system according to claim 2, wherein the monitoring device detects whether the roll is in contact with the hot material, and when the roll is not in contact with the hot material, determines whether the temperature of the roll is within a reference temperature. The monitoring device further includes a notification unit that notifies the cooling device of an abnormality when it is determined that the cooling device has an abnormality.
A monitoring system according to any one of claims 1 to 4. The photographing device photographs the thermal image over the entire length of the roll in the axial direction of the roll.
The monitoring system according to claim 1. The roll is at least one of a conveyor roll that constitutes a conveyor that conveys the hot material, and a rolling roll that rolls the hot material.
The monitoring system according to claim 1. A monitoring method for monitoring a roll to which heat is transferred from a hot material and cooled by a cooling device, the method comprising:
a photographing step of photographing a thermal image of the roll;
a monitoring step of monitoring the thermal image taken in the imaging step;
has
In the monitoring step, the temperature of the roll is identified based on the thermal image, and if the identified temperature of the roll exceeds a preset reference temperature, it is determined that there is an abnormality in the cooling device.
Monitoring method.

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