Coal silo fire detection device based on fiber bragg grating temperature array

Abstract

The utility model belongs to the technical field of coal yard fire detection, and particularly relates to a coal silo fire detection device based on a fiber bragg grating temperature array, which comprises a base and a detection assembly arranged outside the base. The detection assembly comprises sliding grooves, a first gear, an arc-shaped groove and a shaft rod, the multiple sliding grooves are annularly formed in the upper surface of the base, and the first gear is rotationally connected to the outer side of the center position of the base; through the telescopic design of the supporting rod, the device can adapt to coal silos of different sizes, the telescopic length of the supporting rod can be reduced in a narrow coal silo, the telescopic length of the supporting rod can be increased in a large coal silo, and therefore the universality and flexibility of the device are improved. It means that the same set of equipment can be used in coal silos of different specifications, and the equipment purchasing and replacing cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal yard fire detection, and in particular relates to a coal silo fire detection device based on a fiber grating temperature array. Background Art

[0002] Coal mines are a common mineral resource. Common forms of coal mines include underground coal mines and open-pit coal mines. Underground coal mines generally use tunnel excavation to mine coal. Since coal is a flammable substance, some monitoring devices are usually set up during the mining process of underground coal seams to prevent the occurrence of fires.

[0003] After checking the public (announcement) number: CN219121586U discloses a coal mine spontaneous combustion fire monitoring device based on fiber grating sensing. This technology discloses "including a fixed seat installed at the position to be monitored, and also includes a mounting shell, the mounting shell is installed on the fixed seat, and a gas sensor is arranged in the mounting shell. The gas sensor is used to monitor the content of flammable gas in the air in the coal mine. The side of the mounting shell away from the fixed seat is provided with a temperature sensor technical solution, and the blocking groove limits the displacement of the limit column along the length direction of the connecting tube, reducing the occurrence of the technical effect of the connection column falling out of the connecting tube";

[0004] Although the design can limit the displacement of the limit column along the length direction of the connecting tube through the blocking groove and reduce the occurrence of the connecting column escaping from the connecting tube, in actual operation, the coal yard environment is relatively complex. When performing fire detection on some narrow coal silos of different sizes, the detection device cannot quickly adapt to different coal yard environments. At the same time, dust and water vapor will adhere to the surface of the fiber grating during the detection process, affecting the detection results.

[0005] Therefore, a coal silo fire detection device based on fiber grating temperature array is designed to solve the above problems. Utility Model Content

[0006] To solve the problems raised in the above background technology. The utility model provides a coal silo fire detection device based on a fiber grating temperature array. The fiber grating temperature sensing array body and the fiber grating temperature sensor are installed in a sparse upper and dense lower manner. The sparse upper and dense lower design can make more fiber grating temperature sensors located in areas with larger temperature gradients, thereby more accurately measuring the temperature. This is crucial for timely detection of temperature anomalies and prevention of safety accidents such as fires. The dense layout of temperature sensors can detect temperature anomalies in a timely manner and reduce the possibility of missed reports and false reports. Through the telescopic design of the support rod, the measuring device can adapt to coal silos of different sizes. The telescopic length of the support rod can be reduced in a narrower coal silo, and the telescopic length of the support rod can be increased in a larger coal silo, thereby improving the versatility and flexibility of the device, which means that the same set of equipment can be used in coal silos of different specifications, reducing the cost of equipment procurement and replacement.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coal silo fire detection device based on a fiber Bragg grating temperature array, comprising a base and a coal silo body outside the base, and also comprising a fiber Bragg grating temperature sensor assembly arranged on the inner wall surface of the coal silo body;

[0008] Several groups of fiber grating temperature sensor assemblies with fixed protective components are respectively installed on the inner side of the coal silo body. One end of the fiber grating temperature sensor assembly is fixedly connected to the fiber grating temperature measurement host. The fiber grating temperature sensor assembly includes a fiber grating temperature sensor array body and a fiber grating temperature sensor body. The fiber grating temperature sensor array body is configured with several fiber grating temperature sensor bodies. The fiber grating temperature sensor bodies of the fiber grating temperature sensor assembly at the same height are evenly spaced and arrayed on the inner side of the coal silo body. The spacing between the fiber grating temperature sensor bodies on the same group of fiber grating temperature sensor assemblies gradually decreases from top to bottom.

[0009] The protective component includes a polymer polyethylene outer jacket, a forward-surrounding high-carbon steel wire layer, a reverse-surrounding high-carbon steel wire layer, a polymer polyethylene film and a stainless steel hose. The forward-surrounding high-carbon steel wire layer and the reverse-surrounding high-carbon steel wire layer are fixedly installed inside the polymer polyethylene outer jacket, a polymer polyethylene film is fixedly installed between the forward-surrounding high-carbon steel wire layer and the reverse-surrounding high-carbon steel wire layer, a stainless steel hose is fixedly installed on the surface of the tubular structure formed by the reverse-surrounding high-carbon steel wire layer, and a fiber grating temperature sensor component is fixedly installed inside the stainless steel hose.

[0010] As a preferred coal silo fire detection device based on fiber grating temperature array of the utility model, the outer side of one end of the fiber grating temperature sensing array body is interconnected with the outer sides of one end of several fiber grating temperature sensor bodies and are installed on both sides of the inner wall of the coal silo body in a vertical structure.

[0011] As a preferred coal silo fire detection device based on a fiber grating temperature array of the utility model, the detection end of the fiber grating temperature sensor is embedded and fixed on the inner wall of the coal silo body in a manner inclined toward the bottom of the coal silo body, and each of the fiber grating temperature sensing array body and the outer surface of the fiber grating temperature sensor are fixedly connected with a stainless steel protective tube, and the outer surface of the stainless steel protective tube is fixedly connected to the inner wall of the coal silo body.

[0012] As a preferred embodiment of a coal silo fire detection device based on a fiber grating temperature array of the utility model, the detection assembly also includes a sliding groove, a first gear, an arc groove and an axle rod, a plurality of sliding grooves are provided in an annular manner on the upper surface of the base, a first gear is rotatably connected to the outer side at the central position of the base, a plurality of arc grooves are provided in an annular manner on the inner side of the end of the first gear, a support rod is slidably connected to the inside of the sliding groove of the base, a sliding block is fixedly connected to the upper surface of the support rod, the sliding block passes through the sliding groove of the base and contacts the inner wall of the arc groove of the first gear, and a plurality of arc grooves are provided on the lower surface of the base. A first motor is installed, and the output shaft end of the first motor is fixedly connected to a shaft rod, the outer surface of the shaft rod is slidably connected to the inner wall of a through hole provided on the outer side of the base end, the outer side of the end of the shaft rod is fixedly connected to a second gear, the first gear is meshingly connected to the second gear, a plurality of connecting column blocks are fixedly connected to the lower surface of the base, a connecting plate is fixedly connected to the outer side of the end of the connecting column block, a plurality of mounting blocks are annularly fixedly connected to the outer side of the end of the connecting plate, a fiber grating temperature sensor array body is installed on the outer side of the end of the mounting block, and a plurality of pull rings are fixedly connected to the upper surface of the base.

[0013] As a preferred embodiment of the coal silo fire detection device based on fiber grating temperature array of the utility model, a support plate is fixedly connected to the outer side of the end of the support rod, and a plurality of anti-slip nails are fixedly connected to the outer surface of the support plate.

[0014] As a preferred embodiment of the coal silo fire detection device based on fiber grating temperature array of the utility model, a dust cover is fixedly connected to the outer side of the end of the connecting plate, and a plurality of through holes are opened on the outer side of the dust cover.

[0015] As a preferred embodiment of the coal silo fire detection device based on the fiber grating temperature array of the utility model, an air fan is installed inside the through hole provided on the inner side of one end of the connecting plate.

[0016] As a preferred coal silo fire detection device based on a fiber grating temperature array of the utility model, a second motor is installed on the lower surface at the central position of the base, a cleaning rod is fixedly connected to the outer side of the end of the output shaft of the second motor, and bristles are fixedly connected to the inner surface of the end of the cleaning rod, the bristles are made of flexible material, and the bristles are in contact with the fiber grating temperature sensor array body.

[0017] Compared with the prior art, the beneficial effects of the utility model are: adding a detection component to the present application, and adopting a sparse-up and dense-down installation method for the fiber grating temperature sensing array body and the fiber grating temperature sensor. The sparse-up and dense-down design can make more fiber grating temperature sensors located in areas with larger temperature gradients, thereby more accurately measuring the temperature. This is crucial for timely detection of temperature anomalies and prevention of safety accidents such as fires. The dense layout of temperature sensors can timely detect temperature anomalies and reduce the possibility of missed reports and false reports. Through the telescopic design of the support rod, the measuring device can adapt to coal silos of different sizes. In a narrower coal silo, the telescopic length of the support rod can be reduced, and in a larger coal silo, the telescopic length of the support rod can be increased, thereby improving the versatility and flexibility of the equipment, which means that the same set of equipment can be used in coal silos of different specifications, reducing the cost of equipment procurement and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the installation of the fiber grating temperature sensor array body in the utility model;

[0021] Figure 3 It is a structural schematic diagram of the base and the detection assembly in the utility model;

[0022] Figure 4 It is a cross-sectional view of the base and the detection assembly in the utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the dust cover and the air fan in the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the cleaning rod and bristles in the utility model;

[0025] Figure 7This is a schematic diagram of the structure of the support plate and the anti-slip studs in the utility model;

[0026] Figure 8 It is a structural schematic diagram of the sliding groove and the first gear in the utility model;

[0027] Fig. 9 It is a structural schematic diagram of the protection component in the utility model.

[0028] In the figure:

[0029] 1. Base;

[0030] 2. Fiber Bragg grating temperature sensor assembly; 21. Sliding groove; 22. First gear; 23. Arc groove; 24. Support rod; 25. Sliding block; 26. First motor; 27. Shaft rod; 28. Second gear; 29. ​​Pull ring; 210. Connecting column block; 211. Connecting plate; 212. Mounting block; 213. Fiber Bragg grating temperature sensor array body; 214. Support plate; 215. Anti-slip spikes; 216. Dust cover; 217. Air fan; 218. Second motor; 219. Cleaning rod; 220. Brush; 221. Fiber Bragg grating temperature sensor body; 222. Stainless steel protective tube; 3. Coal silo body;

[0031] 4. Protective components; 41. Polyethylene jacket; 42. Forward surrounding high carbon steel wire layer; 43. Reverse surrounding high carbon steel wire layer; 44. Polyethylene film; 45. Stainless steel hose. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figures 1 to 3 As shown;

[0034] A coal silo fire detection device based on a fiber grating temperature array comprises a base 1 and a coal silo body 3 outside the base 1.

[0035] In this implementation scheme: After investigation, the public (announcement) number: CN219121586U discloses a coal mine spontaneous combustion fire monitoring device based on fiber optic Bragg grating sensing. Although the design can limit the displacement of the limit column along the length direction of the connecting tube through the blocking groove, thereby reducing the occurrence of the connecting column escaping from the connecting tube, in actual operation, the coal yard environment is relatively complex. When performing fire detection on some relatively narrow coal silos of different sizes, the detection device cannot quickly adapt to different coal yard environments. At the same time, dust and water vapor will adhere to the surface of the fiber optic Bragg grating during the detection process, affecting the detection results. In order to solve this technical problem, a fiber optic Bragg grating temperature sensor assembly 2 is added on this basis.

[0036] More specifically:

[0037] like Figures 1 to 9 As shown:

[0038] In combination with the above content: a plurality of groups of fiber grating temperature sensor assemblies 2 with fixed sets of protected components 4 are respectively installed on the inner side of the coal silo body 3, one end of the fiber grating temperature sensor assembly 2 is fixedly connected to the fiber grating temperature measurement host, the fiber grating temperature sensor assembly 2 includes a fiber grating temperature sensor array body 213 and a fiber grating temperature sensor body 221, the fiber grating temperature sensor array body 213 is configured with a plurality of fiber grating temperature sensor bodies 221, the fiber grating temperature sensor bodies 221 of the fiber grating temperature sensor assembly 2 at the same height are evenly spaced and arrayed on the inner side of the coal silo body 3, and the spacing between the fiber grating temperature sensor bodies 221 on the same group of fiber grating temperature sensor assemblies 2 gradually decreases from top to bottom;

[0039] The protection component 4 includes a polymer polyethylene jacket 41, a forward-surrounding high-carbon steel wire layer 42, a reverse-surrounding high-carbon steel wire layer 43, a polymer polyethylene film 44 and a stainless steel hose 45. The forward-surrounding high-carbon steel wire layer 42 and the reverse-surrounding high-carbon steel wire layer 43 are fixedly installed inside the polymer polyethylene jacket 41, and the polymer polyethylene film 44 is fixedly installed between the forward-surrounding high-carbon steel wire layer 42 and the reverse-surrounding high-carbon steel wire layer 43. The stainless steel hose 45 is fixedly installed on the surface of the tubular structure formed by the reverse-surrounding high-carbon steel wire layer 43, and the fiber grating temperature sensor component 2 is fixedly installed inside the stainless steel hose 45.

[0040] In this embodiment: when the installation form of the fiber Bragg grating temperature sensing array body 213 and the fiber Bragg grating temperature sensor body 221 adopts the sparse upper and dense lower mode, the sparse upper and dense lower design can make more fiber Bragg grating temperature sensor bodies 221 be located in the area with a larger temperature gradient, so as to measure the temperature more accurately. This is very important for timely detection of temperature anomalies and prevention of safety accidents such as fire. The dense layout of temperature sensors can timely detect temperature anomalies and reduce the possibility of missed reports and false reports. By setting the protection component 4, it can be realized to provide protection for the fiber Bragg grating temperature sensor component 2, and the protection component 4 can improve the tensile strength of the fiber Bragg grating temperature sensor component 2.

[0041] Going further:

[0042] In an optional embodiment, the outer side of one end of the fiber Bragg grating temperature sensor array body 213 is interconnected with the outer sides of one end of a plurality of fiber Bragg grating temperature sensor bodies 221 and are installed on both sides of the inner wall of the coal silo body 3 in a vertical structure.

[0043] In this embodiment: the fiber grating temperature sensing array body 213 and the fiber grating temperature sensor body 221 are externally sheathed with a high-strength protective tube, and by being installed vertically on both sides of the inner wall of the coal silo body 3, the fiber grating temperature sensing array body 213 and the fiber grating temperature sensor body 221 can be more evenly distributed on the inner walls on both sides of the silo. The vertical installation can ensure that the fiber grating temperature sensing array body 213 and the fiber grating temperature sensor body 221 cover the entire height range of the silo, so as to ensure that the temperatures at different heights in the silo can be accurately monitored. At the same time, the vertically installed fiber grating temperature sensing array body 213 and the fiber grating temperature sensor body 221 can better adapt to the environmental changes inside the silo, which helps to improve the stability of the system and reduce errors and failures caused by environmental changes.

[0044] Going further:

[0045] In an optional embodiment, the detection end of the fiber grating temperature sensor body 221 is embedded and fixed on the inner wall of the coal silo body 3 in a manner inclined toward the bottom of the coal silo body 3, and each fiber grating temperature sensor array body 213 and the outer surface of the fiber grating temperature sensor body 221 are fixedly connected with a stainless steel protective tube 222, and the outer surface of the stainless steel protective tube 222 is fixedly connected to the inner wall of the coal silo body 3.

[0046] In the present embodiment: by installing the fiber grating temperature sensing array body 213 and the fiber grating temperature sensor body 221 at a position near the inner wall surface of the coal silo body 3, on the one hand, during the sliding process of the coal seam, the stainless steel protection tube 222 inserted into the coal seam will rub against the part of the stainless steel protection tube 222 inserted into the coal seam, and then the stainless steel protection tube 222 inserted into the coal seam will transmit the temperature information to the fiber grating temperature sensor body 221. At the same time, the continuous friction of the coal seam will cause the wear of the fiber grating temperature sensor body 221, while the fiber grating temperature sensor body 221 will not be damaged at the edge of the inner wall of the coal silo body 3, thereby increasing the service life of the device.

[0047] Going further:

[0048] In an optional embodiment, the fiber grating temperature sensor assembly 2 further includes a sliding groove 21, a first gear 22, an arc groove 23 and a shaft 27. A plurality of sliding grooves 21 are provided in an annular manner on the upper surface of the base 1. The first gear 22 is rotatably connected to the outer side of the central position of the base 1. A plurality of arc grooves 23 are provided in an annular manner on the inner side of the end of the first gear 22. A support rod 24 is slidably connected to the inside of the sliding groove 21 of the base 1. A sliding block 25 is fixedly connected to the upper surface of the support rod 24. The sliding block 25 penetrates the sliding groove 21 of the base 1 and contacts the inner wall of the arc groove 23 of the first gear 22. A first motor 26 is installed on the lower surface of the base 1. The output shaft end of the first motor 26 is fixedly connected with a shaft rod 27, the outer surface of the shaft rod 27 is slidably connected to the inner wall of a through hole provided on the outer side of the end of the base 1, the outer side of the end of the shaft rod 27 is fixedly connected with a second gear 28, the first gear 22 is meshingly connected with the second gear 28, a plurality of connecting column blocks 210 are fixedly connected to the lower surface of the base 1, a connecting plate 211 is fixedly connected to the outer side of the end of the connecting column block 210, a plurality of mounting blocks 212 are annularly fixedly connected to the outer side of the end of the connecting plate 211, a fiber grating temperature sensor array body 213 is installed on the outer side of the end of the mounting block 212, and a plurality of pull rings 29 are fixedly connected to the upper surface of the base 1.

[0049] In this embodiment, when the detection device is needed, the staff first connects the pull ring 29 on the surface of the base 1 through a crane and a rope, and then puts the detection device into the coal silo that needs to be detected. When the position is appropriate, the first motor 26 on the lower surface of the base 1 can be started. The output shaft of the first motor 26 drives the shaft 27 and the second gear 28 to rotate, and at the same time drives the first gear 22 that is connected to the upper surface of the base 1 and meshed with the second gear 28 to rotate. The radius of the second gear 28 is small, while the radius of the first gear 22 is large. According to the lever principle, when the second gear 2 When the radius of the second gear 28 is smaller than the radius of the first gear 22, the rotational force required by the second gear 28 will be smaller than the rotational force generated by the first gear 22. Therefore, the second gear 28 drives the first gear 22 to rotate, which can achieve a labor-saving effect. The inner sliding connection of the through groove at one end of the base 1 is provided with a support rod 24, which is composed of a straight rod and an arc rod. The arc structure at the end of the support rod 24 is designed to better fit the inner wall of the coal silo. The sliding block 25 fixedly connected to the upper surface of the end of the support rod 24 passes through the sliding groove 21 of the base 1 and extends to the arc groove 22 of the first gear 22. 3, the sliding block 25 contacts the inner wall of the arc groove 23 of the first gear 22, and the first gear 22 can make the sliding block 25 stay anywhere on the inner wall of the arc groove 23. Since the arc groove 23 is an arc structure, when the second gear 28 drives the first gear 22 meshing with it to rotate, the arc groove 23 of the first gear 22 will drive the sliding block 25 to move on the inner wall of the arc groove 23. Since the support rod 24 is slidably connected with the sliding groove 21 of the base 1, the support rod 24 can be extended and retracted inside the sliding groove 21 of the base 1 under the drive of the sliding block 25. When each support rod 24 is against the coal When the inner wall of the silo is firmly supported, the first motor 26 can be turned off, and then the fire detection of the coal silo can be carried out by taking out the fiber optic Bragg grating temperature sensor array body 213 under the base 1. The telescopic design of the support rod 24 allows the detection device to adapt to coal silos of different sizes. The telescopic length of the support rod 24 can be reduced in a narrow coal silo, and the telescopic length of the support rod 24 can be increased in a larger coal silo, thereby improving the versatility and flexibility of the equipment, which means that the same set of equipment can be used in coal silos of different specifications, reducing the cost of equipment procurement and replacement.

[0050] It should be noted that the purpose of the connecting column block 210 on the lower surface of the base 1 is to fix the connecting plate 211, and the function of the mounting block 212 on the lower surface of the connecting plate 211 is to fix the fiber Bragg grating temperature sensing array body 213. The principle of the fiber Bragg grating temperature array to detect fire is mainly based on the temperature sensing characteristics of the fiber Bragg grating. When the temperature around the fiber Bragg grating in the detection area changes, it will cause the grating period or the core refractive index to change, thereby generating a wavelength shift of the grating Bragg signal. This wavelength shift has a simple linear relationship with the change of the ambient temperature. By monitoring the change of the Bragg wavelength, the change of the temperature around the fiber Bragg grating in the detection area can be obtained, and then the fire detection of the coal silo can be performed.

[0051] Going further:

[0052] In an optional embodiment, a support plate 214 is fixedly connected to the outer side of the end of the support rod 24 , and a plurality of anti-slip spikes 215 are fixedly connected to the outer surface of the support plate 214 .

[0053] In this embodiment: through the support plate 214 and the anti-skid nails 215 at the end of the support rod 24, the anti-skid nails 215 of the conical structure can be inserted into the inner wall of the coal silo when the support rod 24 is extended and retracted, thereby preventing the detection device from falling, increasing the friction between the inner wall of the coal silo, and increasing the stability of the fire detection of the device.

[0054] Going further:

[0055] In an optional embodiment, a dust cover 216 is fixedly connected to the outer side of the end of the connecting plate 211 , and a plurality of through holes are formed on the outer side of the dust cover 216 .

[0056] In the present embodiment: the dust cover 216 is an annular structure with a hollow interior, which can be mounted on the outside of the fiber grating temperature sensor array body 213. Through the dust cover 216 on the lower surface of the connecting plate 211 and the through holes on the outside of the dust cover 216, the fiber grating temperature sensor array body 213 is prevented from being directly exposed to the external environment while ensuring the heat dissipation and ventilation of the fiber grating temperature sensor array body 213, thereby reducing the accumulation and contamination of external dust on the surface of the fiber grating temperature sensor array body 213, helping to keep the fiber grating temperature sensor array body 213 clean, and also extending its service life, thereby improving the stability and reliability of the fire detection system.

[0057] Going further:

[0058] In an optional embodiment, an air fan 217 is installed inside a through hole provided on an inner side of one end of the connecting plate 211 .

[0059] In this embodiment: an air fan 217 is installed inside the through hole of the connecting plate 211, and the air fan 217 is located above the fiber optic Bragg grating temperature sensor array body 213. The air fan 217 can generate airflow to help dry the moisture on the surface of the fiber optic Bragg grating temperature sensor array body 213, prevent moisture from accumulating on the optical fiber, and help maintain the performance and stability of the fiber optic Bragg grating temperature sensor array body 213, which can improve the accuracy and timeliness of fire detection, and can also improve the overall detection efficiency and reduce the possibility of false alarms and missed alarms.

[0060] It should be noted that moisture will affect the refractive index of the optical fiber, thereby affecting the accuracy of its temperature detection.

[0061] Going further:

[0062] In an optional embodiment, a second motor 218 is installed on the lower surface at the central position of the base 1, and a cleaning rod 219 is fixedly connected to the outer side of the end of the output shaft of the second motor 218, and a brush 220 is fixedly connected to the inner surface of the end of the cleaning rod 219. The bristles 220 are made of flexible material and are in contact with the fiber grating temperature sensor array body 213.

[0063] In this embodiment: the cleaning rod 219 is composed of a straight rod structure and an arc structure. The purpose of the arc structure is to wrap the fiber Bragg grating temperature sensor array body 213, and then by starting the second motor 218, the cleaning rod 219 is driven to rotate with the axis of the output shaft of the second motor 218 as the center of the circle. The arc structure at the end of the cleaning rod 219 will move on the outer surface of the fiber Bragg grating temperature sensor array body 213. At the same time, the opening of the arc structure at the end of the cleaning rod 219 can allow the mounting block 212 to pass through, thereby driving the bristles 220 on the inner side of the end of the cleaning rod 219 to continuously clean the outer surface of the fiber Bragg grating temperature sensor array body 213. Through the arc structure and the bristles 220 at the end of the cleaning rod 219, the fiber Bragg grating temperature sensor array body 213 can be cleaned more thoroughly, and the accumulation of dust on the surface of the fiber Bragg grating temperature sensor array body 213 is minimized, thereby ensuring the working stability of the fiber Bragg grating temperature sensor array body 213.

[0064] It should be noted that the bristles 220 are made of a flexible, high temperature resistant material.

[0065] Working principle: When the fiber grating temperature sensing array body 213 and the fiber grating temperature sensor body 221 are installed in a sparse top and dense bottom manner, the sparse top and dense bottom design can make more fiber grating temperature sensor bodies 221 located in areas with larger temperature gradients, thereby more accurately measuring the temperature. This is crucial for timely detection of temperature anomalies and prevention of safety accidents such as fires. The dense layout of temperature sensors can detect temperature anomalies in a timely manner and reduce the possibility of missed reports and false reports. The fiber grating temperature sensing array body 213 and the fiber grating temperature sensor body 221 are externally sheathed with high-strength protective tubes. By being installed vertically on both sides of the inner wall of the coal silo body 3, the fiber grating temperature sensing array body 213 and the fiber grating temperature sensor body 221 can be more evenly distributed on both sides of the inner wall of the silo. The vertical installation can ensure that the fiber grating temperature sensing array body 213 and the fiber grating temperature sensor body 221 cover the entire height of the silo. The temperature range can be ensured to be accurately monitored at different heights in the silo. At the same time, the vertically mounted fiber grating temperature sensor array body 213 and the fiber grating temperature sensor body 221 can better adapt to the environmental changes inside the silo, which helps to improve the stability of the system and reduce errors and failures caused by environmental changes. By installing the fiber grating temperature sensor array body 213 and the fiber grating temperature sensor body 221 near the inner wall of the coal silo body 3, on the one hand, during the coal seam's sliding process, the stainless steel protective tube 222 inserted into the coal seam will transmit the temperature information to the stainless steel protective tube 222 inserted into the coal seam through friction. The temperature of the fiber grating temperature sensor 221 is transmitted to the fiber grating temperature sensor body 221. At the same time, the continuous friction of the coal seam will cause the wear of the fiber grating temperature sensor body 221, while the fiber grating temperature sensor body 221 is at the edge of the inner wall of the coal silo body 3 and will not be damaged, thereby increasing the service life of the device. When the detection device is needed, the staff first connects it to the pull ring 29 on the surface of the base 1 through a crane and a rope, and then puts the detection device into the coal silo that needs to be detected. When the position is suitable, the first motor 26 on the lower surface of the base 1 can be started, and the output shaft of the first motor 26 drives the shaft 27 and the second gear 28 to rotate, and at the same time drives the rotating connection The first gear 22 on the upper surface of the base 1 and meshingly connected with the second gear 28 rotates. The radius of the second gear 28 is smaller, while the radius of the first gear 22 is larger. According to the lever principle, when the radius of the second gear 28 is smaller than the radius of the first gear 22, the rotation force required by the second gear 28 will be smaller than the rotation force generated by the first gear 22. Therefore, the second gear 28 drives the first gear 22 to rotate, which can achieve a labor-saving effect. In addition, a support rod 24 is slidably connected to the inner side of a through groove provided on the outer side of one end of the base 1. The support rod 24 consists of a straight rod and an arc rod. The arc structure at the end of the support rod 24 is designed to better fit the inner wall of the coal silo.The sliding block 25 fixedly connected to the upper surface of the end of the support rod 24 passes through the sliding groove 21 of the base 1 and extends to the inside of the arc groove 23 of the first gear 22. The sliding block 25 contacts the inner wall of the arc groove 23 of the first gear 22, and the first gear 22 can make the sliding block 25 stay anywhere on the inner wall of the arc groove 23. Since the arc groove 23 is an arc structure, when the second gear 28 drives the first gear 22 meshing with it to rotate, the arc groove 23 of the first gear 22 will drive the sliding block 25 to move on the inner wall of the arc groove 23. Since the support rod 24 is slidably connected to the sliding groove 21 of the base 1, the support rod 24 can be extended and retracted inside the sliding groove 21 of the base 1 under the drive of the sliding block 25. When each support rod 24 reaches When the inner wall of the coal silo is firmly supported, the first motor 26 can be turned off, and then the fire detection of the coal silo can be carried out through the fiber optic Bragg grating temperature sensor array body 213 under the base 1. The telescopic design of the support rod 24 allows the detection device to adapt to coal silos of different sizes. In a narrow coal silo, the telescopic length of the support rod 24 can be reduced, and in a larger coal silo, the telescopic length of the support rod 24 can be increased, thereby improving the versatility and flexibility of the equipment, which means that the same set of equipment can be used in coal silos of different specifications, reducing the cost of equipment procurement and replacement. Through the support plate 214 and the anti-skid nails 215 at the end of the support rod 24, the support rod 24 can be extended and retracted with the anti-skid nails of the conical structure. 215 penetrates into the inner wall of the coal silo to prevent the detection device from falling, increases the friction between the inner wall of the coal silo, and increases the stability of the fire detection of the device. The dust cover 216 is a hollow ring structure inside, which can be sleeved on the outside of the fiber grating temperature sensor array body 213. Through the dust cover 216 on the lower surface of the connecting plate 211 and the through hole outside the dust cover 216, the fiber grating temperature sensor array body 213 is prevented from being directly exposed to the external environment while ensuring the heat dissipation and ventilation of the fiber grating temperature sensor array body 213, thereby reducing the accumulation and pollution of external dust on the surface of the fiber grating temperature sensor array body 213, helping to keep the fiber grating temperature sensor array body 213 clean, and also prolonging its service life, improving The stability and reliability of the high fire detection system are improved. An air fan 217 is installed inside the through hole of the connecting plate 211. The air fan 217 is located above the fiber grating temperature sensing array body 213. The air fan 217 can generate airflow to help dry the moisture on the surface of the fiber grating temperature sensing array body 213 and prevent moisture from accumulating on the optical fiber, which helps to maintain the performance and stability of the fiber grating temperature sensing array body 213, improve the accuracy and timeliness of fire detection, and also improve the overall detection efficiency, and reduce the possibility of false alarms and missed alarms. The cleaning rod 219 is composed of a straight rod structure and an arc structure. The purpose of the arc structure is to wrap the fiber grating temperature sensing array body 213, and then by starting the second motor 218,The cleaning rod 219 is driven to rotate with the axis of the output shaft of the second motor 218 as the center of the circle. The arc structure at the end of the cleaning rod 219 will move on the outer surface of the fiber Bragg grating temperature sensor array body 213. At the same time, the opening of the arc structure at the end of the cleaning rod 219 can allow the mounting block 212 to pass through, thereby driving the bristles 220 on the inner side of the end of the cleaning rod 219 to continuously clean the outer surface of the fiber Bragg grating temperature sensor array body 213. The arc structure and bristles 220 at the end of the cleaning rod 219 can clean the fiber Bragg grating temperature sensor array body 213 more thoroughly, minimize the accumulation of dust on the surface of the fiber Bragg grating temperature sensor array body 213, and ensure the working stability of the fiber Bragg grating temperature sensor array body 213.

[0066] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A coal silo fire detection device based on a fiber grating temperature array, comprising a base (1) and a coal silo body (3) outside the base (1), characterized in that: It also includes a fiber grating temperature sensor assembly (2) arranged on the inner wall surface of the coal silo body (3); A plurality of groups of fiber grating temperature sensor assemblies (2) are respectively installed on the inner side of the coal silo body (3) and are fixedly sleeved by the protected components (4). One end of the fiber grating temperature sensor assembly (2) is fixedly connected to the fiber grating temperature measurement host. The fiber grating temperature sensor assembly (2) comprises a fiber grating temperature sensing array body (213) and a fiber grating temperature sensor body (221). The fiber grating temperature sensing array body (213) is configured with a plurality of fiber grating temperature sensor bodies (221). The fiber grating temperature sensor bodies (221) of the fiber grating temperature sensor assembly (2) at the same height are evenly spaced and arrayed on the inner side of the coal silo body (3). The spacing between the fiber grating temperature sensor bodies (221) on the same group of fiber grating temperature sensor assemblies (2) gradually decreases from top to bottom. The protection component (4) comprises a polymer polyethylene outer jacket (41), a forward surrounding high carbon steel wire layer (42), a reverse surrounding high carbon steel wire layer (43), a polymer polyethylene film (44) and a stainless steel hose (45); the forward surrounding high carbon steel wire layer (42) and the reverse surrounding high carbon steel wire layer (43) are fixedly installed inside the polymer polyethylene outer jacket (41); the polymer polyethylene film (44) is fixedly installed between the forward surrounding high carbon steel wire layer (42) and the reverse surrounding high carbon steel wire layer (43); the stainless steel hose (45) is fixedly installed on the surface of the tubular structure formed by the reverse surrounding high carbon steel wire layer (43); and the fiber grating temperature sensor component (2) is fixedly installed inside the stainless steel hose (45).

2. The coal silo fire detection device based on fiber grating temperature array according to claim 1 is characterized in that: The outer side of one end of the fiber grating temperature sensing array body (213) is connected to the outer sides of one end of a plurality of fiber grating temperature sensor bodies (221) and is installed on both sides of the inner wall surface of the coal silo body (3) in a vertical structure.

3. The coal silo fire detection device based on fiber grating temperature array according to claim 1 is characterized in that: The detection end of the fiber grating temperature sensor body (221) is embedded and fixed on the inner wall of the coal silo body (3) in a manner inclined toward the bottom of the coal silo body (3); the outer surface of each fiber grating temperature sensing array body (213) and the fiber grating temperature sensor body (221) is fixedly connected to a stainless steel protection tube (222); the outer surface of the stainless steel protection tube (222) is fixedly connected to the inner wall of the coal silo body (3).

4. The coal silo fire detection device based on fiber grating temperature array according to claim 1 is characterized in that: The fiber grating temperature sensor assembly (2) further comprises a sliding groove (21), a first gear (22), an arc groove (23) and a shaft (27); a plurality of sliding grooves (21) are provided in an annular manner on the upper surface of the base (1); a first gear (22) is rotatably connected to the outer side of the central position of the base (1); a plurality of arc grooves (23) are provided in an annular manner on the inner side of the end of the first gear (22); a support rod (24) is slidably connected to the inside of the sliding groove (21) of the base (1); a sliding block (25) is fixedly connected to the upper surface of the support rod (24); the sliding block (25) passes through the sliding groove (21) of the base (1) and contacts the inner wall of the arc groove (23) of the first gear (22); a first motor (26) is installed on the lower surface of the base (1); The output shaft end of the first motor (26) is fixedly connected to a shaft rod (27), the outer surface of the shaft rod (27) is slidably connected to the inner wall of a through hole provided on the outer side of the end of the base (1), the outer side of the end of the shaft rod (27) is fixedly connected to a second gear (28), the first gear (22) is meshingly connected to the second gear (28), the lower surface of the base (1) is fixedly connected to a plurality of connecting column blocks (210), the outer side of the end of the connecting column block (210) is fixedly connected to a connecting plate (211), the outer side of the end of the connecting plate (211) is annularly fixedly connected to a plurality of mounting blocks (212), the outer side of the end of the mounting block (212) is mounted with a fiber grating temperature sensing array body (213), and the upper surface of the base (1) is fixedly connected to a plurality of pull rings (29).

5. The coal silo fire detection device based on fiber grating temperature array according to claim 4 is characterized in that: A support plate (214) is fixedly connected to the outer side of the end of the support rod (24), and a plurality of anti-slip studs (215) are fixedly connected to the outer surface of the support plate (214).

6. The coal silo fire detection device based on fiber grating temperature array according to claim 4 is characterized in that: A dust cover (216) is fixedly connected to the outer side of the end of the connecting plate (211), and a plurality of through holes are provided on the outer side of the dust cover (216).

7. The coal silo fire detection device based on fiber grating temperature array according to claim 4 is characterized in that: An air fan (217) is installed inside a through hole provided on the inner side of one end of the connecting plate (211).

8. The coal silo fire detection device based on fiber grating temperature array according to claim 1 is characterized in that: A second motor (218) is installed on the lower surface at the central position of the base (1); a cleaning rod (219) is fixedly connected to the outer side of the end of the output shaft of the second motor (218); bristles (220) are fixedly connected to the inner surface of the end of the cleaning rod (219); the bristles (220) are made of a flexible material, and the bristles (220) are in contact with the fiber optic grating temperature sensor array body (213).

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