Flame monitoring device, fire extinguishing system, and alarm system

Abstract

To provide a flame monitoring device, a fire extinguishing system, and an alarm system for enabling a monitoring person to confirm the situation of a conveyed object whose ignition is detected without overlooking it, and for contributing to proper fire extinguishing.SOLUTION: The flame monitoring device 10 includes a flame detection unit 11B that detects appearance and disappearance of a flame in a monitoring section set in a part of a conveyance path, and a control unit 11A that performs predetermined control, and the control unit 11A records an image of the monitoring section captured by the fixed point camera 14 in the storage unit 11B from when the appearance of the flame is detected to when the disappearance of the flame is detected by the flame detection unit 11C, and repeatedly reproduces, on the monitoring screen 12, a previous moving image that is a moving image based on an image newly stored in the storage unit 11C when the recording is completed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a flame monitoring device that monitors flames that may occur on an object being transported by a transport device, a fire extinguishing system that extinguishes a flame that occurs on the object, and an alarm system that issues an alarm when a flame occurs on the object. [Background technology]

[0002] 2. Description of the Related Art In waste treatment facilities, fire extinguishing devices are installed in case waste that has been cut or crushed by a crusher catches fire while being transported to a predetermined location on a transport conveyor or the like. For example, Patent Document 1 discloses a waste crushing facility equipped with a waste supply device, a crusher, a crushed material conveying device, a fire prevention device, and a control device, in which the fire prevention device is formed from a plurality of sprinkler nozzles provided within the casing of the crushed material conveying device, a sprinkler control valve that controls the water supply to the sprinkler nozzles, and a plurality of CO detectors provided within the casing of the crushed material conveying device that detect the CO concentration in the internal atmosphere, and in which a fire detection signal from the CO detector automatically stops the crusher and activates the fire prevention device to extinguish the crushed material by sprinkling water on the fire prevention device. Furthermore, Patent Document 2 discloses a fire detection device that includes an infrared array sensor that detects the amount of infrared rays in a monitored area as an individual value for each of multiple pixels, and a detection unit that, regarding a monitored object that moves over time within the monitored area by the infrared array sensor, acquires multiple detection results from the infrared array sensor while the monitored object is moving within the monitored area, and determines whether a high-temperature object has passed as the monitored object based on the detection results. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-240295 [Patent Document 2] Japanese Patent Publication No. 2020-166455 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventions described in Patent Documents 1 and 2 automatically detect fires in transported goods based on sensor information, but since monitors cannot immediately know the status of the goods when a fire is detected, there is a possibility that firefighting activities or responses to false alarms may be delayed. Therefore, an object of the present invention is to provide a flame monitoring device, a fire extinguishing system, and an alarm system that allow an inspector to check the status of a transported item in which a fire has been detected without overlooking it, and that contributes to appropriate fire extinguishing. [Means for solving the problem]

[0005] The flame monitoring device 10 of the present invention described in claim 1 is a flame monitoring device that monitors flames that may occur in objects being transported by a transport device, and is equipped with a flame detection unit 11B that detects the appearance and disappearance of flames in a monitoring area set in a part of the transport path, and a control unit 11A that performs predetermined control, and is characterized in that the control unit 11A records images of the monitoring area taken by a fixed camera 14 in a memory unit 11C from the time the appearance of a flame is detected by the flame detection unit 11B until the disappearance of a flame is detected, and when the recording is completed, repeatedly plays back on the monitoring screen 12 the previous video, which is a video based on the image newly saved in the memory unit 11C. The present invention described in claim 2 is characterized in that, in the flame monitoring device 10 described in claim 1, when playback of the most recent video and projection of real-time video based on images captured by a fixed camera 14 are performed on the same monitoring screen 12, the control unit 11A displays the real-time video on the monitoring screen 12 when the most recent video is not being played, and when the most recent video is being played, the real-time video is not displayed or is displayed in a smaller display size than the most recent video. The present invention described in claim 3 is characterized in that, in the flame monitoring device 10 described in claim 2, when the flame detection unit 11B detects the appearance of a flame during repeated playback of the previous video, the control unit 11A terminates playback of the previous video and starts projecting a real-time video or increases the display size of the real-time video being projected. The present invention described in claim 4 is characterized in that, in the flame monitoring device 10 described in claim 2, when the flame detection unit 11B detects the appearance of a flame, the control unit 11A issues an alarm from the sound generation unit 13 and displays an alarm on the monitoring screen 12, and continues the alarm display at least until playback of the previous video begins. The present invention described in claim 5 is characterized in that, in the flame monitoring device 10 described in claim 2, the control unit 11A displays on the monitoring screen 12 an indication that repeated playback is in progress, and displays the total time and elapsed time per playback of the previous video being played. The present invention as set forth in claim 6 is characterized in that in the flame monitoring device 10 as set forth in claim 1, the control unit 11A displays the type of the transported object on the monitoring screen 12. The present invention as set forth in claim 7 is characterized in that in the flame monitoring device 10 as set forth in claim 1, the flame detection unit 11B determines the appearance and disappearance of a flame in the monitoring area based on an image taken by the fixed camera 14. The present invention described in claim 8 is characterized in that, in the flame monitoring device 10 described in claim 7, the flame detection unit 11B determines the appearance and disappearance of a flame in the monitoring area based on the wavelength of ultraviolet rays measured by an ultraviolet sensor 15 installed in the monitoring area or the temperature distribution measured by a thermal camera 16 installed in the monitoring area. The fire extinguishing system of the present invention described in claim 9 is a fire extinguishing system for extinguishing fires on objects being transported by a transport device, and is equipped with a flame monitoring device 10 described in any one of claims 1 to 8 and a fire extinguishing device 20 having a spray head, and is characterized in that when the flame detection unit 11B of the flame monitoring device 10 detects the appearance of a flame in a monitoring section set in a part of the transport path, the fire extinguishing device 20 sprays extinguishing agent from the spray head. The alarm system of the present invention described in claim 10 is an alarm system that issues an alarm when a flame occurs in an object being transported by a transport device, and is characterized in that it comprises a flame monitoring device 10 described in any one of claims 1 to 8 and an alarm device 30 having an alarm that alerts the surrounding area to the occurrence of a fire, and when the flame detection unit 11B of the flame monitoring device 10 detects the appearance of a flame in a monitoring section set up in part of the transport route, the alarm device 30 sounds the alarm. [Effects of the Invention]

[0006] The fire monitoring device, fire extinguishing system, and alarm system of the present invention can prevent a monitor from overlooking a fire in a transported item and can extinguish the fire appropriately. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic diagram of a fire extinguishing system and an alarm system according to the present invention; [Figure 2] A diagram showing an example of installation when the flame monitoring device is applied to a waste treatment facility. [Figure 3] Figure showing an example of the monitoring screen DETAILED DESCRIPTION OF THE INVENTION

[0008] The flame monitoring device according to the first embodiment of the present invention is a flame monitoring device that monitors flames that may occur in objects being transported by a transport device, and is equipped with a flame detection unit that detects the appearance and disappearance of flames in a monitoring area set up in part of the transport path, and a control unit that performs predetermined control.The control unit records images of the monitoring area taken by a fixed camera in a memory unit from the time the appearance of a flame is detected by the flame detection unit until the disappearance of a flame is detected, and when the recording is completed, repeatedly plays back on the monitoring screen the most recent video, which is a video based on the image newly stored in the memory unit. According to this embodiment, after the flame disappears from the monitoring screen, the video of when the flame appeared is repeatedly played, thereby preventing the monitor from overlooking a transported item in which ignition has been detected, and also making it easier for the monitor to determine whether the flame is dangerous enough to lead to a major fire.

[0009] In a second embodiment of the present invention, in a flame monitoring device according to the first embodiment, when playback of the most recent video and projection of real-time video based on images captured by a fixed camera are performed on the same monitoring screen, the control unit displays the real-time video when the most recent video is not being played on the monitoring screen, and when the most recent video is being played, the real-time video is not displayed or is displayed in a smaller display size than the most recent video. According to this embodiment, while the previous video is being played back, the observer can concentrate on the previous video and determine the danger of the fire.

[0010] In the third embodiment of the present invention, in the flame monitoring device of the second embodiment, when the flame detection unit detects the appearance of a flame during repeated playback of the previous video, the control unit terminates playback of the previous video and starts projecting a real-time video or increases the display size of the real-time video being projected. According to this embodiment, a watchman can immediately check any flames that appear during repeated regeneration.

[0011] In the fourth embodiment of the present invention, in the flame monitoring device according to the second embodiment, when the flame detection unit detects the appearance of a flame, the control unit issues an alarm from the sound generation unit and displays an alarm on the monitoring screen, and continues to display the alarm at least until playback of the most recent video begins. According to this embodiment, by issuing a visual alarm and an audible alarm simultaneously, it is possible to strongly encourage the monitor to pay close attention to the real-time video.

[0012] In the fifth embodiment of the present invention, in the flame monitoring device according to the second embodiment, the control unit displays on the monitoring screen, while the most recent video is being repeatedly played, an indication that the video is being repeatedly played, and the total time and elapsed time per playback of the most recent video being played. According to this embodiment, the monitor can instantly grasp how much time is left until the immediately preceding video being played ends, how long the flames have been visible on the monitor screen, and so on.

[0013] In a sixth embodiment of the present invention, in the flame monitoring device according to the first embodiment, the control unit displays the type of the transported object on the monitoring screen. According to this embodiment, when determining the danger of a fire occurring in a transported item, the monitor can take into consideration the fire characteristics depending on the type of transported item.

[0014] In the seventh embodiment of the present invention, in the flame monitoring device according to the first embodiment, the flame detection unit determines the appearance and disappearance of a flame in the monitoring area based on images taken by a fixed camera. According to this embodiment, the flame detection unit can accurately detect the appearance and disappearance of a flame in the monitored area.

[0015] The eighth embodiment of the present invention is a flame monitoring device according to the seventh embodiment, in which the flame detection unit determines the appearance and disappearance of a flame in the monitoring area based on the wavelength of ultraviolet rays measured by an ultraviolet sensor installed in the monitoring area or the temperature distribution measured by a thermal camera installed in the monitoring area. According to this embodiment, the flame detection unit can more accurately detect the appearance and disappearance of a flame in the monitored area.

[0016] A fire extinguishing system according to a ninth embodiment of the present invention is a fire extinguishing system for extinguishing fires on objects being transported by a transport device, and is equipped with a flame monitoring device according to any one of the first to eighth embodiments and a fire extinguishing device having a spray head, and when the flame detection unit of the flame monitoring device detects the appearance of a flame in a monitoring section set up in part of the transport path, the fire extinguishing device sprays extinguishing agent from the spray head. According to this embodiment, a flame occurring in the transported goods can be extinguished before it develops into a major fire.

[0017] An alarm system according to a tenth embodiment of the present invention is an alarm system that issues an alarm when a flame occurs in an object being transported by a conveying device, and is equipped with a flame monitoring device according to any one of the first to eighth embodiments and an alarm device having an alarm that alerts the surrounding area to the occurrence of a fire, and when the flame detection unit of the flame monitoring device detects the appearance of a flame in a monitoring section set up in part of the conveying route, the alarm device sounds the alarm. According to this embodiment, it is possible to notify people other than watchmen of the occurrence of a fire. [Example]

[0018] A flame monitoring device, a fire suppression system, and an alarm system according to one embodiment of the present invention will now be described. FIG. 1 is a schematic diagram of a fire extinguishing system and an alarm system. The fire extinguishing system and alarm system include a flame monitoring device 10, a fire extinguishing device 20 with a spray head, and an alarm device 30 that alerts the surrounding area to the occurrence of a fire. Note that in this embodiment, the fire extinguishing system and alarm system have both a fire extinguishing function and an alarm function, but it is also possible to have a system specialized in either the fire extinguishing function or the alarm function, such as a fire extinguishing system equipped with the flame monitoring device 10 and the fire extinguishing device 20, or an alarm system equipped with the flame monitoring device 10 and the alarm device 30.

[0019] Flame monitoring device 10 has a controller 11 having a control unit 11A, a flame detection unit 11B, and a memory unit 11C, a monitoring screen 12, a sound generation unit 13 such as a speaker or buzzer, a fixed camera 14 which is a visible camera, an ultraviolet sensor 15, and a thermal camera 16, and monitors for flames that may occur in the transported object being transported by the transport device in a monitoring section set up in a part of the transport path. Note that the monitoring section can be set up in not just one location, but multiple locations. The storage unit 11C is, for example, a solid state drive (SSD) or a hard disk drive (HDD), and the monitoring screen 12 is a monitor or a display.

[0020] The flame monitoring system 10 is linked to a fire suppression system 20 and an alarm system 30 . The fire extinguishing device 20 sprays a fire extinguishing agent from spray nozzles installed in the monitoring section or other transport routes toward the ignited transported object. The alarm device 30 is, for example, an automatic fire alarm system, and includes an alarm that sounds throughout the entire waste treatment facility in the event of a fire. If the fire extinguishing device 20 and the alarm device 30 have been installed before the fire extinguishing system and the alarm system are introduced, these existing facilities may be used.

[0021] FIG. 2 is a diagram showing an example of installation of the flame monitoring device when applied to a waste treatment facility. There are various waste processing flows at waste treatment facilities, but for example, waste sent to crusher 2 by waste transport conveyor 1 is crushed into crushed material by crusher 2, and as it is transported in order by first crushed material transport conveyor 3, second crushed material transport conveyor 4, and third crushed material transport conveyor 5, it is separated into iron, aluminum, plastic, combustibles, etc. by magnetic separators and aluminum sorters, and then sent to storage locations for sorting, such as first storage bunker 6, second storage bunker 7, and third storage bunker 8.

[0022] In the crusher 2, friction between metals can cause sparks that can burn combustible materials, or a strong impact can be applied to lithium-ion batteries mixed in the crusher 2. This can cause the ignited combustible materials to flow onto a conveying device such as a crushed material conveyor located downstream of the crusher 2, or damaged lithium-ion batteries to ignite on the conveying device. Therefore, in order to detect such ignition early and prevent the fire from spreading, in this embodiment, a monitoring area using a flame monitoring device 10 is set up on the second crushed material transport conveyor 4, which is located relatively close to the crusher 2. Furthermore, spray heads for spraying fire extinguishing agent are installed in the monitored area as well as in other areas where fires may occur, such as crushed material transport conveyors, storage bunkers, etc. In the case of equipment with a large surface area, such as crushed material transport conveyors, if there are areas where the extinguishing agent cannot be reached by a single spray head, multiple spray heads can be installed to share the fire extinguishing areas.

[0023] The fixed camera 14, ultraviolet sensor 15, and thermal camera 16 of the flame monitoring device 10 are installed in or near the monitored area. The fixed camera 14 is a visible light camera that continuously captures images of mainly the top surface of the second crushed material transport conveyor 4 in the monitoring area. The transport speed of the crushed material transport conveyor is approximately 0.3 to 1.0 m / sec, and crushed materials pass in front of the fixed camera 14 one after another, but it is preferable to set the orientation of the fixed camera 14 so that the time from the appearance to the disappearance of a crushed material is at least 3 seconds. For example, rather than capturing images from the side of the second crushed material transport conveyor 4, the camera captures images in a direction along the flow of the second crushed material transport conveyor 4, such as by pointing the lens from downstream to upstream. If a camera has been installed before the introduction of the flame monitoring device 10, the existing camera may be used as the fixed camera 14 without installing a new camera.

[0024] The flame detection unit 11B processes the images captured by the fixed camera 14 and determines the appearance and disappearance of a flame based on at least one of the brightness, position, shape, size, color, and fluctuation of the flame, for example. This allows the appearance and disappearance of a flame in the monitored area to be detected with high accuracy. Since the flame detection unit 11B detects flames using images taken by the fixed camera 14, it is desirable that the location where the image is taken is dark even during the day. However, many areas of the crushed material transport conveyor are covered with cover material to prevent dust from scattering, etc., and the insides of such areas are dark. Therefore, if an area covered with cover material is selected as the monitoring area, there is no need to install new cover material, etc. Furthermore, it is preferable that the flame detection unit 11B judges the appearance and disappearance of a flame in the monitoring area based on at least one of the ultraviolet wavelength information acquired by the ultraviolet sensor 15 and the temperature distribution information acquired by the thermal camera 16. This allows for more accurate detection of the appearance and disappearance of a flame in the monitoring area.

[0025] Figure 3 shows an example of a monitoring screen, where Figure 3(a) is the screen when no flames are detected in the monitored area, Figure 3(b) is the screen when a flame is detected in the monitored area, and Figure 3(c) is the screen when the most recent video is being played repeatedly after the flames have disappeared. The controller 11, the monitor screen 12, and the sound generating unit 13 of the flame monitoring device 10 are installed in a monitoring room where a monitor who monitors the crushing process is present. Under normal circumstances when no flames are detected, real-time video based on images taken by the fixed camera 14 is displayed on the monitoring screen 12 (see FIG. 3(a)). Note that, as described above, the location where the fixed camera 14 is installed is dark, so the monitoring screen 12 is almost completely dark.

[0026] When ignited crushed objects enter the monitoring area or when crushed objects ignite within the monitoring area, the appearance of a flame in the monitoring area is detected by the flame detection unit 11B. When the flame detection unit 11B detects the appearance of a flame, the control unit 11A issues an alarm to the monitor and starts recording in the memory unit 11C. During recording, real-time video (live images) is continuously displayed on the monitoring screen 12, allowing the monitor to immediately check the size, shape, etc. of the flame (see FIG. 3(b)). For example, if the fixed camera 14 is installed at the end (downstream side) of the second crushed material transport conveyor 4 with its lens facing the start (upstream side), if the crushed material ignited before entering the monitoring area, the flame will appear from the top of the monitoring screen 12 and move downward, as shown by the dotted arrows in FIGS. 3(b) and (c). The alarm for the monitor is preferably issued by simultaneously displaying a warning such as a red line 12A around the edge of the monitoring screen 12 and emitting an alarm sound or a voice announcing a fire from the sound generating unit 13. Although the flame is only displayed on the monitoring screen 12 for a short period of time, such as a few seconds, issuing a visual and audio alarm simultaneously attracts the attention of the monitor and prevents the flame from being overlooked.

[0027] If the crushed objects leave the monitoring area while still burning, or if the fire of the crushed objects is extinguished within the monitoring area, the flame detection unit 11B detects that the flame in the monitoring area has disappeared. When flame detection unit 11B detects that the flame has disappeared, control unit 11A stops recording and repeatedly plays the previous video, which is a video based on the image newly saved in memory unit 11C, on monitoring screen 12 (FIG. 3(c)). In addition, the alarm for the monitor stops approximately simultaneously with the start of playback of the previous video. In this way, when the appearance of a flame is detected, the video of the scene immediately after the flame disappears is automatically replayed. This prevents the flame from being overlooked, because even if the monitor misses the real-time image (real-time video) of the flame appearance, the monitor will notice the appearance of the flame by looking at the subsequent replay image (immediately preceding video).

[0028] Furthermore, when a flame appears, the monitor can immediately check the situation using real-time video or the latest video, which allows for more appropriate response when a flame appears. For example, if the observer judges that the fire is highly dangerous but the fire extinguisher 20 does not automatically activate, the spread of the fire can be prevented by manually activating the fire extinguisher 20. Conversely, if the observer judges that the fire is low in danger but the fire extinguisher 20 automatically activates, unnecessary fire extinguishing can be prevented by manually stopping the fire extinguisher 20. Furthermore, the flame detection method, threshold value, etc. can be reviewed in consideration of the discrepancy between the observer's judgment and the judgment of the flame detection unit 11B, thereby improving the accuracy of flame detection.

[0029] In this embodiment, the monitoring screen 12 on which the real-time video is displayed and the monitoring screen 12 on which the previous video is played are the same, and on that one monitoring screen 12, when the previous video is not being played back repeatedly, the real-time video is displayed on the monitoring screen 12, and when the previous video is being played back repeatedly, the real-time video is not displayed on the monitoring screen 12 or is displayed smaller than the previous video. This allows the monitor to concentrate on the previous video when it is being played and determine the risk of fire.

[0030] An operation unit that the observer uses to operate the flame monitoring device 10 is provided on or near the monitoring screen 12. The observer can perform operations such as starting / stopping the operation of the flame detection unit 11B, pausing the previous video, changing the playback speed, ending repeated playback, and inputting the type of waste. The repeated playback of the previous video can be set to automatically end when a predetermined number of repetitions is reached, but it is preferable to set it to continue regardless of the number of repetitions until the observer performs an operation to end it. This reduces the possibility that the observer will overlook the appearance of a flame, and also allows the observer to rewatch the previous video without performing any special operation until they can determine the danger of the flame. When the repeated playback of the immediately preceding video has finished, the control unit 11A causes the real-time video to be displayed on the monitoring screen 12 again.

[0031] If the flame detection unit 11B detects the appearance of a new flame during the repeated playback of the previous video, the control unit 11A immediately ends the repeated playback, issues an alarm, and displays the real-time video (if the real-time video was being displayed small on the monitoring screen 12, the display size is restored). This allows the monitor to immediately check the newly appeared flame during the repeated playback. In this case, too, the control unit 11A records the monitoring images from when the flame detection unit 11B detects the appearance of a new flame until it detects its disappearance in the memory unit 11C, and after the recording is completed, the control unit 11A repeatedly plays back the new most recent video on the monitoring screen 12. If the observer wishes to rewatch the previous video whose repeat playback was forcibly terminated due to the appearance of a new flame, or any video before that, they can select the relevant file from the saved folder and rewatch it.

[0032] While the previous video is being repeatedly played back, the control unit 11A causes the monitoring screen 12 to display a display indicating that the video is being repeatedly played back, and a display indicating the total time and elapsed time per playback of the previous video being played back. For example, to indicate that the most recent video is being played back repeatedly, a line 12B of a different color (e.g., yellow) than that used during an alarm is displayed around the periphery of the monitoring screen 12, and the word "Replay" and mark 12C in the same color as line 12B are displayed in the upper right corner of the screen. Also, a gauge 12D is displayed in the upper right corner of the screen to indicate the total time and elapsed time per playback. By displaying that the video is being played repeatedly, it is possible to prevent the monitor from mistaking the previous video for a real-time video. Also, by displaying the total time and elapsed time per playback, the monitor can immediately grasp how much time is left until the previous video being played ends, how long the flames have been visible on the monitoring screen 12, etc.

[0033] The control unit 11A preferably displays the type of waste (crushed material) being processed on the monitoring screen 12. The type of waste is input into the flame monitoring device 10 by an inspector, for example, when the waste is input. This allows the inspector to take into account the fire characteristics of each type of waste when determining the risk of a flame occurring in the crushed material. The type of waste is, for example, scrap metal, scrap rubber, waste plastics, or a mixture of two or more of these, etc. In Fig. 3, the type (for example, "scrap metal") is displayed in a display field 12E provided in the upper left of the screen.

[0034] The fire extinguishing system and alarm system at least include a fire extinguishing agent tank storing a fire extinguishing agent such as foam, powder, gas, or water containing a wetting agent, a spray head, and piping connecting the spray head to the fire extinguishing agent tank. The fire extinguishing agent tank may be replaced with a water tank storing water for fire extinguishing. Alternatively, multiple fire extinguishing agent tanks or water tanks may be provided, and each tank may store a different type of fire extinguishing agent, such as foam, powder, or wetting agent. When the flame detection unit 11B of the flame monitoring device 10 detects the appearance of a flame, the flame monitoring device 10 transmits a signal including information about the monitoring area in which the appearance of the flame was detected and the type of waste to the fire extinguishing device 20 and the alarm device 30. When the fire extinguishing device 20 receives the signal, it selects a fire extinguishing agent according to the type of waste, opens the selection valve corresponding to the monitoring section where the appearance of flames is detected, and sprays the extinguishing agent from the spray nozzle. Alternatively, a set of fire extinguishing agent tank, spray head, and connecting piping, etc. may be installed for each monitoring section, and the extinguishing agent may be sprayed from the corresponding spray head in the monitoring section where the appearance of flames is detected. In addition, the alarm device 30 sounds an alarm. This not only notifies people outside the monitoring room of the fire outbreak, but also makes it possible to extinguish any flames that have broken out in the crushed materials before they develop into a major fire.

[0035] The flame monitoring device 10 may determine the level of fire danger based on the type of waste, the size of the flame, etc., rather than immediately transmitting a signal to the fire extinguisher 20 and the alarm device 30 when the flame detection unit 11B detects the appearance of a flame, and transmit the signal when it is determined from the determination result that sounding an alarm or discharging a fire extinguishing agent is necessary. This allows for a more appropriate response when a flame appears. In addition, the flame (fire point) moves along with the crushed material (transported material) by the transport device, and it is preferable that the flame monitoring device 10 tracks the flame based on at least one of the brightness, position, temperature, shape, size, color, and fluctuation of the flame. Furthermore, when the appearance of flames is detected successively within a short period of time by the flame detection unit 11B, the flame monitoring device 10 preferably determines the priority of fire extinguishing based on at least one of the brightness, position, temperature, shape, size, color, and fluctuation of the flame, and instructs the fire extinguisher 20 to extinguish the flames starting with the flames with the highest priority. Furthermore, the direction of the spray nozzle may be configured to be variable, and the flame monitoring device 10 may calculate the direction in which to point the spray nozzle based on the position of the flame with the highest priority, and instruct the fire extinguisher 20 to point the spray nozzle in the calculated direction and spray the extinguishing agent. [Industrial Applicability]

[0036] The flame monitoring device, fire extinguishing system, and alarm system of the present invention can be used for fire monitoring and fire extinguishing of materials being transported by a transport device such as a transport conveyor. [Explanation of symbols]

[0037] 10 Flame monitoring device 11A Control unit 11B Flame detection unit 11C Storage section 12 Monitoring screen 13 Sound generating unit 14 Fixed Camera 15 UV sensor 16 Thermal Camera 20 Fire extinguishing equipment 30 Alarm device

Claims

1. A flame monitoring device for monitoring a flame that may occur in an object being transported by a transport device, a flame detection unit that detects the appearance and disappearance of the flame in a monitoring section set in a part of the conveying path; a control unit that performs predetermined control, The control unit images of the monitoring area taken by a fixed camera are recorded in a storage unit from the time when the appearance of the flame is detected by the flame detection unit until the disappearance of the flame is detected; A flame monitoring device characterized in that, when the recording is completed, the immediately preceding video, which is a video based on the image newly stored in the memory unit, is repeatedly played back on the monitoring screen.

2. The flame monitoring device described in claim 1, characterized in that when the playback of the most recent video and the projection of real-time video based on images captured by the fixed camera are performed on the same monitoring screen, the control unit displays the real-time video when the most recent video is not being played on the monitoring screen, and when the most recent video is being played, the control unit does not display the real-time video or displays it in a smaller display size than the most recent video.

3. The flame monitoring device described in claim 2, characterized in that when the flame detection unit detects the appearance of the flame during repeated playback of the previous video, the control unit terminates playback of the previous video and starts projecting the real-time video or increases the display size of the real-time video being projected.

4. The flame monitoring device described in claim 2, characterized in that when the flame detection unit detects the appearance of the flame, the control unit issues an alarm from the sound generation unit and displays an alarm on the monitoring screen, and continues the alarm display at least until playback of the most recent video begins.

5. The flame monitoring device described in claim 2, characterized in that while the control unit is repeatedly playing back the previous video, it displays on the monitoring screen an indication that repeated playback is in progress, and displays the total time and elapsed time for each playback of the previous video being played.

6. The flame monitoring device according to claim 1 , wherein the control unit displays the type of the transported object on the monitoring screen.

7. 2. The flame monitoring device according to claim 1, wherein the flame detection unit determines the appearance and disappearance of the flame in the monitoring area based on the image captured by the fixed camera.

8. The flame monitoring device described in claim 7, characterized in that the flame detection unit determines the appearance and disappearance of the flame in the monitoring area based on the wavelength of ultraviolet rays measured by an ultraviolet sensor installed in the monitoring area or the temperature distribution measured by a thermal camera installed in the monitoring area.

9. A fire extinguishing system for extinguishing a fire on an object being transported by a transport device, A flame monitoring device according to any one of claims 1 to 8; a fire extinguishing device having a spray head; A fire extinguishing system characterized in that when a flame detection unit of the flame monitoring device detects the appearance of a flame in a monitoring section set up in part of the conveying path, the fire extinguishing device sprays a fire extinguishing agent from the spray head.

10. An alarm system that issues an alarm when a flame occurs in an object being transported by a transport device, A flame monitoring device according to any one of claims 1 to 8; an alarm device having an alarm that notifies the surrounding area of ​​a fire outbreak; An alarm system characterized in that when a flame detection unit of the flame monitoring device detects the appearance of a flame in a monitoring section set in part of the conveying path, the alarm device sounds the alarm.

Images