Device and method for predicting overlying separation zone in coal mining based on fiber bragg grating

Abstract

The invention relates to the technical field of overlying separation zone monitoring, in particular to a coal mining overlying separation zone prediction device and method based on a fiber bragg grating. Comprising a first fiber bragg grating temperature sensor, a first fiber bragg grating pressure sensor, a second fiber bragg grating temperature sensor, a second fiber bragg grating pressure sensor, a water pipe with a control valve, a communication optical fiber, an optical fiber terminal box, a mining transmission optical cable, a fiber bragg grating signal processor and a server cabinet body, the device has the beneficial effects that the temperature and the pressure of the overlying separation layer belt are extremely accurately measured by adopting an advanced fiber grating sensing technology, meanwhile, the pressure and the temperature of a water layer above the overlying separation layer belt are monitored through the first monitoring mechanism, support is provided for monitoring of the overlying separation layer belt, the accuracy of monitoring data is improved, and the monitoring precision of the overlying separation layer belt is improved. Due to the high-precision temperature measurement capability, the system can capture tiny temperature and pressure changes of the rock stratum, data support is provided for temperature compensation of the optical fiber, and a reliable basis is provided for accurately judging the state of the rock stratum.

Description

Technical Field

[0001] The present invention relates to the technical field of overlying separated layer zone monitoring, and specifically to a device and method for predicting the overlying separated layer zone in coal seam mining based on fiber Bragg grating. Background Technique

[0002] China is a major mining country in the world. During the process of coal mine exploitation, disasters such as gas outburst, roof fall, fire, water inrush, and rock burst caused by complex underground geological conditions and harsh production conditions directly endanger the safety production of the mining industry and the life and health of mining workers. In order to ensure the safety production in the mine, there appears a mine separated layer monitor that can monitor the environmental parameters related to the production in the mine.

[0003] At present, the commonly used overlying separated layer zone monitoring devices in coal mines in China are mostly mechanical overlying separated layer indicators and coal mine overlying separated layer indicators that use electrical components to give an alarm in the form of sound and light. The existing overlying separated layer zone monitoring systems include an overlying separated layer dynamic monitoring system based on Zigbee and CAN bus technologies and an overlying separated layer zone monitoring system based on M-BUS bus. Although these means provide reliable data support for the observation of roof separated layer fractures and play a positive role in preventing the movement of overlying rock strata, the above-mentioned monitoring means still have the following disadvantages: the monitoring devices all adopt artificial timing to observe and measure the status of the overlying separated layer zone, which is inconvenient to read in the underground, and at the same time, restricted by the underground roadway conditions and light intensity, the reading artificial error is relatively large; the monitoring system uses a single-chip microcomputer as the controller, the measurement accuracy is not high, moreover, the anti-electromagnetic interference ability is not strong, it is greatly affected by the environment, the measurement range is small, the reliability is low, the implementation effect of dynamically continuously monitoring the overlying separated layer zone of the roadway is not good, and it has a great impact on the safety and reliability of the roadway and the mining and excavation project.

[0004] Therefore, the present invention proposes a device and method for predicting the overlying separated layer zone in coal seam mining based on fiber Bragg grating to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for predicting the overlying separated layer zone in coal seam mining based on fiber Bragg grating to solve the problems raised in the above background technique.

[0006] To achieve the above object, the present invention provides the following technical solutions: a prediction device for overlying separated strata in coal seam mining based on fiber Bragg grating. The prediction device for overlying separated strata in coal seam mining based on fiber Bragg grating includes: a first fiber Bragg grating temperature sensor, a first fiber Bragg grating pressure sensor, a second fiber Bragg grating temperature sensor, a second fiber Bragg grating pressure sensor, a water pipe with a control valve, a communication optical fiber, an optical fiber terminal box, a mining transmission optical cable, a fiber Bragg grating signal processor, and a server cabinet; a monitoring site is arranged every 30 meters within the development position of the overlying separated strata. Each monitoring station includes a first monitoring mechanism and a second monitoring mechanism. The first monitoring mechanism includes a water pipe with a water valve, a second fiber Bragg grating temperature sensor, and a second fiber Bragg grating pressure sensor. The second monitoring mechanism includes two first fiber Bragg grating temperature sensors and two first fiber Bragg grating temperature sensors. The fiber tail of a first fiber Bragg grating temperature sensor is connected to a first fiber Bragg grating pressure sensor, then the fiber tail of the first fiber Bragg grating pressure sensor is connected to another first fiber Bragg grating temperature sensor, and then the fiber tail of another first fiber Bragg grating temperature sensor is connected to another first fiber Bragg grating pressure sensor. The two first fiber Bragg grating temperature sensors and the two first fiber Bragg grating temperature sensors are alternately connected in series;

[0007] A borehole is drilled in the overlying separated strata to the water layer above the overlying separated strata. The water pipe with a water valve is installed in the water layer. The second fiber Bragg grating temperature sensor and the second fiber Bragg grating pressure sensor are installed in the water pipe. The fiber tail of the second fiber Bragg grating temperature sensor is connected to the second fiber Bragg grating pressure sensor. The optical fiber terminal box realizes the connection of the communication optical fibers of each monitoring site and the mining transmission optical cable. The mining transmission cable is connected to the input port of the fiber Bragg grating signal processor, and the output port of the fiber Bragg grating signal processor is connected to the server cabinet. An advanced analysis and processing module is embedded in the server cabinet. The analysis and processing module integrates functions such as data entry and reception, information storage and management, historical data backtracking, real-time dynamic monitoring, data list display, data export and sharing, system log and audit, user permission management, and abnormal alarm and early warning prompts. The server cabinet synchronizes the processed data results to the mobile phone side and the computer side through an industrial local area network to achieve convenient sharing of data.

[0008] Preferably, the connection method of the second fiber Bragg grating temperature sensor and the second fiber Bragg grating pressure sensor and the connection method of the first fiber Bragg grating temperature sensor and the first fiber Bragg grating pressure sensor are that the fiber tails are fused by an optical fiber fusion splicer or connected by an optical fiber coupler.

[0009] Preferably, the industrial local area network is connected to a number of mobile phone sides and computer sides, and the mining grating signal processor uses a network cable communication method.

[0010] Preferably, one end of the water pipe extends to the water layer, and the other end of the water pipe is located in the coal mining seam. The water valve, the second fiber Bragg grating temperature sensor, and the second fiber Bragg grating pressure sensor are arranged close to the coal mining seam. There is a siltstone mud layer below the coal mining seam, and there is a Changxing Formation limestone layer above the water layer.

[0011] Preferably, the distance between the first monitoring mechanism and the second monitoring mechanism is 5 meters, and the distance between the first fiber Bragg grating temperature sensor and the first fiber Bragg grating pressure sensor is 3 meters.

[0012] Preferably, an outer frame is fixed on the front outer side of the server cabinet body. A sealing plate is arranged in the outer frame. A side groove is opened on one side of the outer frame, and sliding grooves are opened on the upper and lower inner walls of the outer frame. The sliding grooves communicate with the side groove. A slot is opened at the center of the inner wall on the other side of the outer frame, and threaded holes are opened on the surface of the outer frame. The threaded holes extend into the slot.

[0013] Preferably, the sealing plate is in the shape of a square plate. Sliders are arranged on the upper and lower sides of the sealing plate. The sliders are slidably connected to the sliding grooves. The sealing plate can move in the side groove. A number of equally spaced through holes are opened on the surface of the sealing plate. A locking plate is fixed at the center position on one side of the sealing plate. The locking plate is inserted into the slot. A limiting hole is opened on the surface of the locking plate. The limiting hole corresponds to the threaded hole. A limiting rod is arranged in the limiting hole and the threaded hole. External threads are arranged on the surface of the limiting rod. The external threads are threadedly connected to the threaded hole. A turning ear is fixed at the end face of the limiting rod.

[0014] Preferably, four groups of evenly distributed bases are fixed at the bottom of the server cabinet body. The bottom of the base is in the shape of a disc. Through holes distributed in a matrix are opened on the rear surface of the server cabinet body.

[0015] Preferably, a number of equally spaced placement cavities are opened inside the server cabinet body. An analysis and processing module is placed in the placement cavity. Heat conducting plates are fixed on the two side walls of the placement cavity. A number of equally spaced heat dissipation wing plates are fixed on the surface of the heat conducting plates. The heat dissipation wing plates extend out of the server cabinet body. Two groups of top handles symmetric about the central axis of the server cabinet body are fixed at the upper end of the server cabinet body.

[0016] A method for a prediction device of overlying separation zone in coal seam mining based on fiber Bragg grating includes the following steps:

[0017] S1: First, regard the overlying strata as interbedded rock slabs. Calculate the spatial size of the separation by the rock slab theory, and judge the position where the separation develops. Drill a hole in the overlying separation zone to the water layer above the overlying separation zone. Install a water pipe with a water valve to the water layer, and install the second fiber Bragg grating temperature sensor and the second fiber Bragg grating pressure sensor in the water pipe, thereby forming a first monitoring mechanism;

[0018] S2: Alternately connect two sets of first fiber Bragg grating temperature sensors and two sets of first fiber Bragg grating pressure sensors in series to form a second monitoring mechanism, and set the second monitoring mechanism at a position 5 meters away from the first monitoring mechanism, thereby realizing the setting of one monitoring station;

[0019] S3: Set the first monitoring mechanism and the second monitoring mechanism according to S1 and S2, and set the second monitoring station composed of the first monitoring mechanism and the second monitoring mechanism at a position 30 meters away from the first monitoring station, thereby realizing the setting of the second monitoring station;

[0020] S4: Use an optical fiber terminal box to connect the communication optical fibers of each monitoring station and the mining transmission optical cable. The mining transmission cable is connected to the input port of the fiber Bragg grating signal processor, and the output port of the fiber Bragg grating signal processor is connected to the server cabinet. The server cabinet synchronizes the processed data results to the mobile phone end and the computer end through an industrial local area network, realizing convenient sharing of data.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The device and method for predicting the overlying separated strata zone in coal seam mining based on fiber Bragg grating proposed by the present invention discriminates the separated strata space in advance, sets multiple monitoring stations in the overlying separated strata zone, and realizes the quantitative characterization and real-time observation of the overlying separated strata zone by adopting the advanced fiber Bragg grating sensing technology. The stress magnitude is characterized by deformation, and the temperature is observed in real time for temperature compensation. At the same time, the first monitoring mechanism monitors the pressure and temperature of the water layer above the overlying separated strata zone, providing support for the monitoring of the overlying separated strata zone and improving the accuracy of monitoring data. This high-precision temperature measurement ability enables the system to capture the tiny temperature and pressure changes of the rock strata, providing a reliable basis for accurately judging the state of the rock strata. By utilizing the characteristics of optical fiber transmission signals, this device can realize long-distance and continuous real-time monitoring of the overlying separated strata zone above the coal mining seam without power supply support. This characteristic not only reduces the complexity and risk of underground power supply but also improves the monitoring efficiency and coverage. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the present invention;

[0024] Figure 2 It is a schematic structural diagram of the server cabinet of the present invention;

[0025] Figure 3 It is a side view of the server cabinet of the present invention;

[0026] Figure 4 It is a side view of the server cabinet of the present invention;

[0027] Figure 5 Schematic diagram of the internal structure of the server cabinet of the present invention;

[0028] Figure 6 Schematic diagram of the heat dissipation wing plate structure of the present invention;

[0029] Figure 7 Schematic diagram of the sealing plate structure of the present invention.

[0030] In the figure: 1, Changxing Formation limestone layer; 2, water layer; 3, first fiber Bragg grating temperature sensor; 4, water pipe; 5, first fiber Bragg grating pressure sensor; 6, coal seam; 7, control valve; 8, second fiber Bragg grating temperature sensor; 9, second fiber Bragg grating pressure sensor; 10, fiber optic pigtail; 11, communication optical fiber; 12, fiber optic terminal box; 13, mine use transmission optical cable; 14, overlying separated layer zone; 15, fiber Bragg grating signal processor; 16, server cabinet; 17, industrial local area network; 18, computer terminal; 19, mobile phone terminal; 20, siltstone mud layer; 21, top handle; 22, heat dissipation wing plate; 23, outer frame; 24, limiting rod; 25, rotating ear; 26, base; 27, sealing plate; 28, through groove; 29, grip; 30, through hole; 31, heat conducting plate; 32, placement cavity; 33, slot; 34, threaded hole; 35, external thread; 36, sliding groove; 37, side groove; 38, locking plate; 39, limiting hole; 40, slider. Detailed implementation manners

[0031] For the sake of simplicity and illustration, the principles of the embodiments are mainly described by referring to examples. In the following description, many specific details are set forth to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures are not described in detail to avoid unnecessarily obscuring these embodiments. Additionally, all embodiments can be used in combination with each other.

[0032] Embodiment 1: Please refer to Figures 1 to 7, the present invention provides a technical solution: a prediction device for the overlying separation zone 14 in coal seam mining based on fiber Bragg grating. The prediction device for the overlying separation zone 14 in coal seam mining based on fiber Bragg grating includes: a first fiber Bragg grating temperature sensor 3, a first fiber Bragg grating pressure sensor 5, a second fiber Bragg grating temperature sensor 8, a second fiber Bragg grating pressure sensor 9, a water pipe 4 with a control valve 7, a communication optical fiber 11, an optical fiber terminal box 12, a mining transmission optical cable 13, a fiber Bragg grating signal processor 15, and a server cabinet 16; a monitoring site is arranged every 30 meters in the overlying separation zone 14, and each monitoring station includes a first monitoring mechanism and a second monitoring mechanism. The first monitoring mechanism includes a water pipe 4 with a water valve, a second fiber Bragg grating temperature sensor 8, and a second fiber Bragg grating pressure sensor 9. The second monitoring mechanism includes two first fiber Bragg grating temperature sensors 3 and two first fiber Bragg grating temperature sensors 3. Connect the optical fiber pigtail 10 of a first fiber Bragg grating temperature sensor 3 to a first fiber Bragg grating pressure sensor 5, then connect the optical fiber pigtail 10 of the first fiber Bragg grating pressure sensor 5 to another first fiber Bragg grating temperature sensor 3, and then connect the optical fiber pigtail 10 of another first fiber Bragg grating temperature sensor 3 to another first fiber Bragg grating pressure sensor 5. The two first fiber Bragg grating temperature sensors 3 and the two first fiber Bragg grating temperature sensors 3 are alternately connected in series;

[0033] Drill a hole in the overlying separation zone 14 to the water layer 2 above the overlying separation zone 14, install the water pipe 4 with a water valve into the water layer 2, install the second fiber Bragg grating temperature sensor 8 and the second fiber Bragg grating pressure sensor 9 in the water pipe 4, and connect the optical fiber pigtail 10 of the second fiber Bragg grating temperature sensor 8 to the second fiber Bragg grating pressure sensor 9. The optical fiber terminal box 12 realizes the connection of the communication optical fiber 11 and the mining transmission optical cable 13 of each monitoring site. The mining transmission cable is connected to the input port of the fiber Bragg grating signal processor 15, and the output port of the fiber Bragg grating signal processor 15 is connected to the server cabinet 16. An advanced analysis and processing module is embedded in the server cabinet 16. The analysis and processing module integrates functions such as data entry and reception, information storage and management, historical data retrieval, real-time dynamic monitoring, data list display, data export and sharing, system log and audit, user permission management, and abnormal alarm and early warning prompts. The server cabinet 16 synchronizes the processed data results to the mobile phone terminal 19 and the computer terminal 18 through the industrial local area network 17 to achieve convenient sharing of data. The method of the prediction device for the overlying separation zone 14 in coal seam mining based on fiber Bragg grating includes the prediction device for the overlying separation zone 14 in coal seam mining based on fiber Bragg grating described above;

[0034] In use, this device adopts advanced fiber Bragg grating sensing technology to achieve extremely accurate measurement of the temperature and pressure of the overlying separation zone 14, improving the accuracy of monitoring data. Each component of the device is reasonably designed, and the installation process is simple and fast, reducing the construction difficulty and time cost. The fiber Bragg grating sensor has excellent anti-electromagnetic interference ability, ensuring the stability and reliability of monitoring data in complex environments. Utilizing the characteristics of fiber optic signal transmission, this device can operate without power supply support, reducing the complexity and risk of underground power supply. It can achieve long-distance and continuous real-time monitoring of the overlying separation zone 14 above the coal seam 6, improving the monitoring efficiency and coverage.

[0035] Embodiment 2: On the basis of Embodiment 1, the connection mode of the second fiber Bragg grating temperature sensor 8 and the second fiber Bragg grating pressure sensor 9, as well as the connection mode of the first fiber Bragg grating temperature sensor 3 and the first fiber Bragg grating pressure sensor 5, is that the fiber pigtail 10 is fused through a fiber optic fusion splicer or connected through a fiber optic coupler. The industrial local area network 17 is connected to a number of mobile terminals 19 and computer terminals 18. The mine-used grating signal processor adopts a network cable communication method. The distance between the first monitoring mechanism and the second monitoring mechanism is 5 meters, and the distance between the first fiber Bragg grating temperature sensor 3 and the first fiber Bragg grating pressure sensor 5 is 3 meters.

[0036] In use, the first monitoring mechanism mainly monitors the temperature and pressure of the water layer 2, while the second monitoring mechanism realizes comprehensive monitoring of the temperature and pressure of the overlying separation zone 14 through the alternating series connection of two first fiber Bragg grating temperature sensors 3 and two first fiber Bragg grating pressure sensors 5. This setting method improves the accuracy and reliability of monitoring. A monitoring site is arranged every 30 meters in the overlying separation zone 14 to ensure the extensiveness of the monitoring range and the continuity of data. At the same time, each monitoring site includes a first monitoring mechanism and a second monitoring mechanism, further enhancing the monitoring accuracy and reliability. The industrial local area network 17 is connected to a number of mobile terminals 19 and computer terminals 18, realizing remote access and sharing of data. At the same time, the mine-used grating signal processor adopts a network cable communication method, improving the stability and speed of data transmission.

[0037] Embodiment 3: On the basis of Embodiment 2, an outer frame 23 is fixed to the outer side of the front end of the server cabinet body 16. A sealing plate 27 is arranged in the outer frame 23. A side groove 37 is formed on one side of the outer frame 23. Sliding grooves 36 are formed on the upper and lower inner walls of the outer frame 23. The sliding grooves 36 communicate with the side groove 37. A slot 33 is formed at the center of the inner wall on the other side of the outer frame 23. Threaded holes 34 are formed on the surface of the outer frame 23, and the threaded holes 34 extend into the slot 33. A locking plate 38 is fixed at the center position on one side of the sealing plate 27. The locking plate 38 is inserted into the slot 33. A limiting hole 39 is formed on the surface of the locking plate 38. The limiting hole 39 corresponds to the threaded hole 34. A limiting rod 24 is arranged in the limiting hole 39 and the threaded hole 34. External threads 35 are formed on the surface of the limiting rod 24, and the external threads 35 are threadedly connected with the threaded holes 34. A rotating ear 25 is fixed at the end face of the limiting rod 24;

[0038] The sealing plate 27 is in the shape of a square plate. Sliders 40 are arranged on the upper and lower sides of the sealing plate 27. The sliders 40 are slidably connected with the sliding grooves 36. The sealing plate 27 can move in the side groove 37. A plurality of equally spaced through grooves 28 are formed on the surface of the sealing plate 27. A locking plate 38 is fixed at the center position on one side of the sealing plate 27. The locking plate 38 is inserted into the slot 33. A limiting hole 39 is formed on the surface of the locking plate 38. The limiting hole 39 corresponds to the threaded hole 34. A limiting rod 24 is arranged in the limiting hole 39 and the threaded hole 34. External threads 35 are formed on the surface of the limiting rod 24, and the external threads 35 are threadedly connected with the threaded holes 34. A rotating ear 25 is fixed at the end face of the limiting rod 24;

[0039] During use, the structure of the server cabinet body 16 is reasonably designed, with good heat dissipation performance and protection performance, ensuring the stable operation of the equipment. By pulling the handle 29, it is convenient to open and close the sealing plate 27. By holding the rotating ear 25 and rotating, it is convenient to move the limiting rod 24. By inserting the limiting rod 24 into the limiting hole 39 and the threaded hole 34, the limiting of the sealing plate 27 is realized;

[0040] Four groups of uniformly distributed bases 26 are fixed at the bottom of the server cabinet body 16. The bottom of the base 26 is in the shape of a disc. Through holes 30 distributed in a matrix are formed on the rear surface of the server cabinet body 16. The sealing plate 27 is in the shape of a square plate. Sliders 40 are arranged on the upper and lower sides of the sealing plate 27. The sliders 40 are slidably connected with the sliding grooves 36. The sealing plate 27 can move in the side groove 37. A plurality of equally spaced through grooves 28 are formed on the surface of the sealing plate 27;

[0041] During use, the four groups of uniformly distributed bases 26 provide stable support for the server cabinet body 16. The bottom of the base 26 is in the shape of a disc, increasing the contact area with the bottom surface and further improving the stability. The sliding connection between the sliding grooves 36 and the sliding grooves 36 improves the smoothness and continuity of the movement of the sealing plate 27. The through grooves 28 and the through holes 30 cooperate with each other to realize the effective flow of air inside the server cabinet body 16 and improve the heat dissipation efficiency;

[0042] Inside the server cabinet 16, a number of equally spaced placement cavities 32 are provided. An analysis and processing module is placed in the placement cavity 32. Are heat conducting plates 31 fixed on both side walls of the placement cavity 32? A number of equally spaced heat dissipation wing plates 22 are fixed on the surface of the heat conducting plate 31. The heat dissipation wing plates 22 extend out of the server cabinet 16. At the upper end of the server cabinet 16, two groups of top handles 21 symmetrical about the central axis of the server cabinet 16 are fixed.

[0043] During use, an advanced analysis and processing module is embedded in the server cabinet 16, which can process monitoring data in real time and synchronize the processed data results to the mobile phone terminal 19 and the computer terminal 18 through the industrial local area network 17, realizing convenient sharing of data. The setting of the top handles 21 facilitates the movement of the server cabinet 16. The heat conducting plate 31 transfers the heat inside the server cabinet 16 to the heat dissipation wing plates 22. The number of heat dissipation wing plates 22 increases the contact area with the air and further improves the heat dissipation efficiency of the server cabinet 16.

[0044] Working principle: In actual use, by pre-judging the separated layer space, multiple monitoring stations are set in the overlying separated layer zone 14. By adopting the advanced fiber Bragg grating sensing technology, extremely accurate measurement of the temperature and pressure of the overlying separated layer zone 14 is achieved. At the same time, through the first monitoring mechanism, the pressure and temperature of the water layer 2 above the overlying separated layer zone 14 are monitored, providing support for the monitoring of the overlying separated layer zone 14 and improving the accuracy of the monitoring data. This high-precision temperature measurement ability enables the system to capture tiny temperature and pressure changes in the rock stratum, providing a reliable basis for accurately judging the state of the rock stratum. By utilizing the characteristics of optical fiber to transmit signals, this device can realize long-distance and continuous real-time monitoring of the overlying separated layer zone 14 above the coal mining seam 6 without power supply support. This characteristic not only reduces the complexity and risk of underground power supply but also improves the monitoring efficiency and coverage.

[0045] Method of a prediction device for the overlying separated layer zone 14 in coal seam mining based on fiber Bragg grating, which includes the following steps:

[0046] S1: Drill a hole in the overlying separated layer zone 14 to the water layer 2 above the overlying separated layer zone 14. Install a water pipe 4 with a water valve to the water layer 2. Install the second fiber Bragg grating temperature sensor 8 and the second fiber Bragg grating pressure sensor 9 in the water pipe 4, thereby forming the first monitoring mechanism.

[0047] S2: Alternately connect two groups of first fiber Bragg grating temperature sensors 3 and two groups of first fiber Bragg grating pressure sensors 5 in series, thereby forming the second monitoring mechanism. Set the second monitoring mechanism at a position 5 meters away from the first monitoring mechanism, thereby realizing the setting of one monitoring station.

[0048] S3: Set up the first monitoring agency and the second monitoring agency according to S1 and S2, and set the second monitoring station formed by the first monitoring agency and the second monitoring agency at a position 30 meters away from the first monitoring station, thereby realizing the setting of the second monitoring station;

[0049] S4: Use the optical fiber terminal box 12 to connect the communication optical fiber 11 of each monitoring station and the mine use transmission optical cable 13. The mine use transmission cable is connected to the input port of the fiber grating signal processor 15, and the output port of the fiber grating signal processor 15 is then connected to the server cabinet 16. The server cabinet 16 synchronizes the processed data results to the mobile phone terminal 19 and the computer terminal 18 through the industrial local area network 17, realizing the convenient sharing of data. [[ID=A]] [[ID=B]]

[0050] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Fiber Bragg Grating-based prediction device for overlying separation zone in coal seam mining, characterized in that: The device for predicting the overlying separation zone in coal seam mining based on fiber Bragg grating includes: a first fiber Bragg grating temperature sensor (3), a first fiber Bragg grating pressure sensor (5), a second fiber Bragg grating temperature sensor (8), a second fiber Bragg grating pressure sensor (9), a water pipe (4) with a control valve (7), a communication optical fiber (11), an optical fiber terminal box (12), a mining transmission optical cable (13), a fiber Bragg grating signal processor (15), and a server cabinet (16); a monitoring station is arranged every 30 meters in the overlying separation zone (14), and each monitoring station includes a first monitoring mechanism and a second monitoring mechanism. The first monitoring mechanism includes a water pipe (4) with a water valve, a second fiber Bragg grating temperature sensor (8), and a second fiber Bragg grating pressure sensor (9). The second monitoring mechanism includes two first fiber Bragg grating temperature sensors (3) and two first fiber Bragg grating temperature sensors (3). The fiber pigtail (10) of a first fiber Bragg grating temperature sensor (3) is connected to a first fiber Bragg grating pressure sensor (5), then the fiber pigtail (10) of the first fiber Bragg grating pressure sensor (5) is connected to another first fiber Bragg grating temperature sensor (3), and then the fiber pigtail (10) of the other first fiber Bragg grating temperature sensor (3) is connected to another first fiber Bragg grating pressure sensor (5), and the two first fiber Bragg grating temperature sensors (3) and the two first fiber Bragg grating temperature sensors (3) are alternately connected in series; Drill a hole in the overlying separation zone (14) to the water layer (2) above the overlying separation zone (14), install the water pipe (4) with a water valve into the water layer (2), install the second fiber Bragg grating temperature sensor (8) and the second fiber Bragg grating pressure sensor (9) in the water pipe (4), connect the fiber pigtail (10) of the second fiber Bragg grating temperature sensor (8) to the second fiber Bragg grating pressure sensor (9). The optical fiber terminal box (12) connects the communication optical fiber (11) of each monitoring station to the mining transmission optical cable (13). The mining transmission cable is connected to the input port of the fiber Bragg grating signal processor (15), and the output port of the fiber Bragg grating signal processor (15) is connected to the server cabinet (16). The server cabinet (16) is embedded with an advanced analysis and processing module, which integrates functions such as data entry and reception, information storage and management, historical data backtracking, real-time dynamic monitoring, data list display, data export and sharing, system log and audit, user permission management, and abnormal alarm and early warning prompts. The server cabinet (16) synchronizes the processed data results to the mobile phone terminal (19) and the computer terminal (18) through an industrial local area network (17) to achieve convenient sharing of data.

2. The prediction device for overlying separated strata zone in coal seam mining based on fiber Bragg grating according to claim 1, characterized in that: The connection mode of the second fiber Bragg grating temperature sensor (8) and the second fiber Bragg grating pressure sensor (9) and the connection mode of the first fiber Bragg grating temperature sensor (3) and the first fiber Bragg grating pressure sensor (5) are that the fiber pigtail (10) is fused by an optical fiber fusion splicer or connected by an optical fiber coupler.

3. The device for predicting the overlying separation zone in coal seam mining based on fiber Bragg grating according to claim 1, wherein: The industrial local area network (17) is connected to a number of mobile phone terminals (19) and computer terminals (18), and the mine grating signal processor adopts a network cable communication mode.

4. The device for predicting the overlying separation zone in coal seam mining based on fiber Bragg grating according to claim 1, wherein: One end of the water pipe (4) extends to the water layer (2), and the other end of the water pipe (4) is located in the coal mining seam (6). The water valve, the second fiber Bragg grating temperature sensor (8) and the second fiber Bragg grating pressure sensor (9) are arranged close to the coal mining seam (6). There is a siltstone mud layer (20) below the coal mining seam (6), and there is a Changxing Formation limestone layer (1) above the water layer (2).

5. The prediction device for overlying separated strata zone in coal seam mining based on fiber Bragg grating according to claim 1, wherein: The distance between the first monitoring mechanism and the second monitoring mechanism is 5 meters, and the distance between the first fiber Bragg grating temperature sensor (3) and the first fiber Bragg grating pressure sensor (5) is 3 meters.

6. The device for predicting the overlying separation zone in coal seam mining based on fiber Bragg grating according to claim 1, wherein: An outer frame (23) is fixed on the outer side of the front end of the server cabinet body (16). A sealing plate (27) is arranged in the outer frame (23). A side groove (37) is opened on one side of the outer frame (23). Sliding grooves (36) are opened on the upper and lower inner walls of the outer frame (23). The sliding grooves (36) communicate with the side groove (37). A slot (33) is opened at the center of the inner wall on the other side of the outer frame (23). Threaded holes (34) are opened on the surface of the outer frame (23), and the threaded holes (34) extend into the slot (33).

7. The device for predicting the overlying separation zone in coal seam mining based on fiber Bragg grating according to claim 6, wherein: The sealing plate (27) is in the shape of a square plate. Sliders (40) are arranged on the upper and lower sides of the sealing plate (27). The sliders (40) are slidably connected with the sliding grooves (36). The sealing plate (27) can move in the side groove (37). A number of equally spaced through grooves (28) are opened on the surface of the sealing plate (27). A locking plate (38) is fixed at the center position on one side of the sealing plate (27). The locking plate (38) is inserted into the slot (33). A limiting hole (39) is opened on the surface of the locking plate (38). The limiting hole (39) corresponds to the threaded hole (34). A limiting rod (24) is arranged in the limiting hole (39) and the threaded hole (34). External threads (35) are opened on the surface of the limiting rod (24). The external threads (35) are threadedly connected with the threaded hole (34). A rotating ear (25) is fixed at the end face of the limiting rod (24).

8. The device for predicting the overlying separation zone in coal seam mining based on fiber Bragg grating according to claim 1, wherein: Four groups of uniformly distributed bases (26) are fixed at the bottom of the server cabinet body (16). The bottom of the base (26) is in the shape of a disc. Through holes (30) distributed in a matrix are opened on the rear surface of the server cabinet body (16).

9. The device for predicting the overlying separated zone in coal seam mining based on fiber Bragg grating according to claim 1, wherein: A number of equally spaced placement cavities (32) are opened inside the server cabinet body (16). Analysis and processing modules are placed in the placement cavities (32). Heat conducting plates (31) are fixed on the two side walls of the placement cavities (32). A number of equally spaced heat dissipation wing plates (22) are fixed on the surface of the heat conducting plates (31). The heat dissipation wing plates (22) extend out of the server cabinet body (16). Two groups of top handles (21) symmetrical about the central axis of the server cabinet body (16) are fixed at the upper end of the server cabinet body (16).

10. A method for a device for predicting the overlying separation zone in coal seam mining based on fiber Bragg grating according to any one of claims 1-9, characterized in that: Including the following steps: S1: Drill a hole in the overlying separated strata zone (14) up to the water layer (2) above the overlying separated strata zone (14), install a water pipe (4) with a water valve into the water layer (2), and install the second fiber Bragg grating temperature sensor (8) and the second fiber Bragg grating pressure sensor (9) inside the water pipe (4), thereby forming the first monitoring mechanism; S2: Set two groups of the first fiber Bragg grating temperature sensors (3) and two groups of the first fiber Bragg grating pressure sensors (5) in an alternating series connection, thereby forming the second monitoring mechanism, and set the second monitoring mechanism at a position 5 meters away from the first monitoring mechanism, thereby realizing the setting of a monitoring site; S3: Set the first monitoring mechanism and the second monitoring mechanism according to S1 and S2, and set the second monitoring site composed of the first monitoring mechanism and the second monitoring mechanism at a position 30 meters away from the first monitoring site, thereby realizing the setting of the second monitoring site; S4: Connect the communication optical fibers (11) of each monitoring site and the mine-used transmission optical cable (13) using an optical fiber terminal box (12). The mine-used transmission cable is connected to the input port of the fiber Bragg grating signal processor (15), and the output port of the fiber Bragg grating signal processor (15) is connected to the server cabinet (16). The server cabinet (16) synchronizes the processed data results to the mobile phone terminal (19) and the computer terminal (18) through the industrial local area network (17), realizing the convenient sharing of data.

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