Mine safety monitoring device based on fiber bragg grating

Abstract

The utility model relates to a mine safety monitoring device based on a fiber bragg grating, and relates to the field of mine monitoring technology, a plurality of fiber bragg grating sensors are connected in series on an optical fiber, coupling seats are fixedly mounted on the plurality of fiber bragg grating sensors respectively, and the plurality of coupling seats are fixedly mounted on the well wall of a mine to be detected at intervals according to a set distance; a sensing cavity used for installing a sensing section of the fiber grating sensor is formed in the coupling seat, vent holes are formed in the two sides of the coupling seat respectively, an anti-explosion protective cover is detachably installed on the coupling seat, two dust collection breathable layers are detachably installed in the anti-explosion protective cover, two air inlet holes are formed in the anti-explosion protective cover in a penetrating mode, and the two air inlet holes are communicated with the air inlet holes. The two air inlet holes are coaxial with the two vent holes respectively, and the two dust collection breathable layers are located between the two vent holes and the two air inlet holes respectively. According to the invention, an operator can timely replace the dust collection breathable layer in the fiber grating sensor, and the precision of the fiber grating sensor for detecting the gas concentration in a mine is guaranteed.

Description

Technical Field

[0001] This application relates to the field of mine monitoring technologies, and particularly to a mine safety monitoring device based on fiber Bragg gratings. Background Art

[0002] Gas disasters are the main disasters in coal mines. Their post-disaster effects will cause the underground communication to collapse and the power supply to be interrupted. The current gas concentration monitoring system mainly based on inductive and point-type monitoring loses its monitoring function due to power failure and cannot obtain the gas concentration distribution in the mine.

[0003] In the prior art, a fiber Bragg grating monitoring system is often used to monitor the gas concentration in a mine. Among them, the fiber Bragg grating monitoring system mainly includes a light source, an optical fiber, a wavelength demodulator, and a control host. The light source is connected to the input end of the optical fiber, the wavelength demodulator is connected to the output end of the optical fiber, the wavelength demodulator is signal-connected to the control host, and a number of fiber Bragg grating sensors are connected in series on the optical fiber. The fiber Bragg grating sensors are fixedly installed on a coupling seat, and the coupling seat is fixedly installed on the shaft wall of the mine to be monitored by screws.

[0004] Among them, both ends of the fiber Bragg grating sensor are fixed on the coupling seat. An induction cavity is provided on the coupling seat. The induction section of the fiber Bragg grating sensor is located in the induction cavity. The induction section includes an induction optical fiber. A grating is engraved on the induction optical fiber, and a methane-sensitive film is coated on the outer wall of the induction optical fiber. Air vents for gas circulation are provided on the cavity of the induction cavity. An explosion-proof cover is fixedly installed on the coupling seat by screws. A dust-absorbing and breathable layer is installed on the coupling seat. The dust-absorbing and breathable layer is located between the explosion-proof cover and the coupling seat. The explosion-proof cover is fixed on the coupling seat by screws. An air inlet is provided on the explosion-proof cover. The air in the mine enters the induction cavity through the air inlet, the dust-absorbing and breathable layer, and the air vents. The methane-sensitive film on the outer wall of the induction optical fiber on the induction section of the fiber Bragg grating sensor located in the induction cavity absorbs methane and expands, resulting in an increase in the pressure on the optical fiber and a change in the wavelength of the reflected light. After being demodulated by a demodulator, the gas concentration value at this place can be obtained, and the operator can perform real-time monitoring of the mine through the control host.

[0005] However, in order to ensure the detection effect of the fiber Bragg grating sensor, the operator needs to regularly replace the dust-absorbing and breathable layer. However, the dust content in the air at different positions in the mine is different, and the dust-absorbing and breathable layer cannot be replaced in time, making it difficult to ensure the detection accuracy of the fiber Bragg grating sensor for gas concentration, and there is room for improvement. Utility Model Content

[0006] In order to ensure that the operator can replace the dust-absorbing and breathable layer in the fiber Bragg grating sensor in time and ensure the accuracy of the fiber Bragg grating sensor in detecting the gas concentration in the mine, this application provides a mine safety monitoring device based on fiber Bragg gratings.

[0007] A mine safety monitoring device based on fiber Bragg grating provided by this application adopts the following technical solution:

[0008] A mine safety monitoring device based on fiber Bragg grating includes an optical fiber arranged along the mine roadway, a light source connected to the input end of the optical fiber, a wavelength demodulator for receiving the reflected light wavelength of the optical fiber, and a control host signal-connected to the wavelength demodulator. A number of fiber Bragg grating sensors are connected in series on the optical fiber, and coupling seats are respectively and fixedly installed on the a number of fiber Bragg grating sensors. The a number of coupling seats are respectively fixedly installed on the shaft wall of the mine to be measured at set distance intervals;

[0009] An induction cavity for installing the induction section of the fiber Bragg grating sensor is formed on the coupling seat. Ventilation holes are respectively opened on both sides of the coupling seat, and the ventilation holes are all communicated with the induction cavity. An explosion-proof cover is detachably installed on the coupling seat, and two dust-absorbing and breathable layers are detachably installed in the explosion-proof cover. Two air inlet holes are penetrated through the explosion-proof cover, and the two air inlet holes are respectively coaxial with the two ventilation holes. The two dust-absorbing and breathable layers are respectively located between the two ventilation holes and the two air inlet holes; and:

[0010] A air permeability detection component, fixedly installed on the coupling seat, located between the dust-absorbing and breathable layer and the explosion-proof cover, is used to send a prompt signal when the air permeability of the dust-absorbing and breathable layer is less than a set value;

[0011] A prompt module, fixedly installed on the coupling seat, is signal-connected to the signal output end of the air permeability detection component, and is used to receive the prompt signal and give a warning.

[0012] By adopting the above technical solution, during the actual detection process, the air in the mine sequentially passes through the air inlet holes, the dust-absorbing and breathable layers and the ventilation holes on the explosion-proof cover and enters the induction cavity. The induction section of the fiber Bragg grating sensor detects the gas concentration in the air and is displayed by the control host; the dust-absorbing and breathable layer can reduce the situation that dust in the mine air enters the induction cavity and affects the detection result of the fiber Bragg grating sensor; during the use of the fiber Bragg grating sensor, as the amount of dust attached to the dust-absorbing and breathable layer increases, the air permeability of the dust-absorbing and breathable layer decreases. When the air permeability effect of the dust-absorbing and breathable layer drops to less than the set value, it is difficult for the air in the mine to enter the induction cavity through the air inlet holes, the dust-absorbing and breathable layers and the ventilation holes, which is likely to affect the detection accuracy of the fiber Bragg grating sensor. The air permeability detection component can regularly detect the air permeability of the dust-absorbing and breathable layer, and when the air permeability of the dust-absorbing and breathable layer is poor, the prompt module prompts the operator to replace the dust-absorbing and breathable layer, which can effectively improve the convenience for the operator to replace the dust-absorbing and breathable layer.

[0013] Preferably, an installation groove is formed at the top of the explosion-proof cover, a slot is formed at the bottom of the installation groove, the dust-absorbing and breathable layer is inserted into the slot, a cover plate is detachably installed at the top of the installation groove, and the cover plate covers the top of the dust-absorbing and breathable layer.

[0014] By adopting the above technical solution, through the setting of the slot, when the dust-absorbing and breathable layer needs to be replaced, the operator can detach the cover plate to replace the dust-absorbing and breathable layer in the slot, and it is not necessary to disassemble the entire explosion-proof cover to replace the dust-absorbing and breathable layer, which improves the convenience of replacing the dust-absorbing and breathable layer.

[0015] Preferably, the air permeability detection component includes:

[0016] An ultrasonic transmitter, fixedly installed on the coupling seat, located on one side of the dust-absorbing and breathable layer, for transmitting ultrasonic waves at a set time interval;

[0017] An ultrasonic receiver, fixedly installed on the coupling seat, located on the side of the dust-absorbing and breathable layer away from the ultrasonic transmitter, for receiving ultrasonic waves and outputting an ultrasonic intensity signal;

[0018] A comparator, signal-connected to the signal output end of the ultrasonic receiver, for receiving the ultrasonic intensity signal and outputting the prompt signal when the ultrasonic intensity is less than the set value.

[0019] By adopting the above technical solution, the ultrasonic waves emitted by the ultrasonic transmitter pass through the dust-absorbing and breathable layer and are received by the ultrasonic receiver. As the dust content attached in the dust-absorbing and breathable layer increases, the intensity of the ultrasonic signal received by the ultrasonic receiver decreases. Through comparison by the comparator chip, it can automatically control the prompt module to issue a warning when the ultrasonic intensity is less than the set value, and the technical effect of detecting the dust content adsorbed by the dust-absorbing and breathable layer and judging the air permeability of the dust-absorbing and breathable layer according to the dust content adsorbed by the dust-absorbing and breathable layer can be achieved.

[0020] Preferably, the prompt module includes an LED lamp, the LED lamp is fixedly installed on the coupling seat, and the signal input end of the LED lamp is signal-connected to the signal output end of the comparator.

[0021] By adopting the above technical solution, when the air permeability of the dust-absorbing and breathable layer decreases, the LED lamp emits light, which can prompt the operator to replace the dust-absorbing and breathable layer in time.

[0022] In summary, the mine safety monitoring device based on fiber Bragg grating of the present application includes at least one of the following beneficial technical effects:

[0023] 1. During the use of the fiber Bragg grating sensor, as the amount of dust attached to the dust-absorbing and breathable layer increases, the air permeability of the dust-absorbing and breathable layer decreases. When the air permeability effect of the dust-absorbing and breathable layer drops below the set value, it is difficult for the air in the mine to enter the sensing cavity through the air inlet hole, the dust-absorbing and breathable layer, and the ventilation hole, which is likely to affect the detection accuracy of the fiber Bragg grating sensor. The air permeability detection component can regularly detect the air permeability of the dust-absorbing and breathable layer, and when the air permeability of the dust-absorbing and breathable layer is poor, the prompting module prompts the operator to replace the dust-absorbing and breathable layer, which can effectively improve the convenience for the operator to replace the dust-absorbing and breathable layer;

[0024] 2. Through the setting of the slot, when the dust-absorbing and breathable layer needs to be replaced, the operator can remove the cover plate to replace the dust-absorbing and breathable layer in the slot, eliminating the need to disassemble the entire explosion-proof shield for replacing the dust-absorbing and breathable layer, thus improving the convenience of replacing the dust-absorbing and breathable layer. Brief Description of the Drawings

[0025] Figure 1 is a schematic diagram showing the overall structure of the monitoring device in the embodiment of the present application.

[0026] Figure 2 is a schematic diagram showing the internal structure of the monitoring device in the embodiment of the present application.

[0027] Figure 3 is a schematic diagram showing the installation positions of the ultrasonic transmitting end and the ultrasonic receiving end in the embodiment of the present application.

[0028] Description of the Reference Numerals: 1, fiber Bragg grating sensor; 2, coupling seat; 21, sensing cavity; 22, ventilation hole; 3, explosion-proof shield; 31, air inlet hole; 32, installation groove; 33, slot; 34, cover plate; 4, dust-absorbing and breathable layer; 5, air permeability detection component; 51, ultrasonic transmitting end; 52, ultrasonic receiving end; 6, LED lamp. Detailed Description of the Embodiment

[0029] The following Figures 1 - 3 further describes the present application in detail.

[0030] Embodiment

[0031] The embodiment of the present application discloses a mine safety monitoring device based on fiber Bragg grating. It mainly includes an optical fiber arranged along the mine roadway, a light source connected to the input end of the optical fiber, a wavelength demodulator for receiving the reflected light of the optical fiber, and a control host signal-connected to the wavelength demodulator. A plurality of fiber Bragg grating sensors 1 are connected in series on the optical fiber, and a coupling seat 2 is fixedly installed on each of the plurality of fiber Bragg grating sensors 1, and the plurality of coupling seats 2 are fixedly installed on the shaft wall of the mine to be measured at set intervals.

[0032] Refer toFigure 1 , Figure 2 and Figure 3 , an induction cavity 21 for installing the induction section of the fiber Bragg grating sensor 1 is formed on the coupling base 2. Ventilation holes 22 are respectively opened on both sides of the coupling base 2, and the ventilation holes 22 are all communicated with the induction cavity 21. An explosion-proof cover 3 is detachably installed on the coupling base 2, and two dust-absorbing and breathable layers 4 are detachably installed in the explosion-proof cover 3. Two air inlet holes 31 are penetrated through the explosion-proof cover 3, and the two air inlet holes 31 are coaxial with the two ventilation holes 22 respectively. The two dust-absorbing and breathable layers 4 are respectively located between the two ventilation holes 22 and the two air inlet holes 31.

[0033] And: a permeability detection component 5, fixedly installed on the coupling base 2, located between the dust-absorbing and breathable layer 4 and the explosion-proof cover 3, and used for sending a prompt signal when the permeability of the dust-absorbing and breathable layer 4 is less than a set value; a prompt module, fixedly installed on the coupling base 2, and signal-connected to the signal output end of the permeability detection component 5, and used for receiving the prompt signal and giving a warning.

[0034] During the actual detection process, the air in the mine sequentially passes through the air inlet holes 31, the dust-absorbing and breathable layer 4 and the ventilation holes 22 on the explosion-proof cover 3 and enters the induction cavity 21. The induction section of the fiber Bragg grating sensor 1 detects the gas concentration in the air and is displayed through the control host; the dust-absorbing and breathable layer 4 can reduce the situation that dust in the mine air enters the induction cavity 21 and affects the detection result of the fiber Bragg grating sensor 1.

[0035] During the use of the fiber Bragg grating sensor 1, as the amount of dust attached in the dust-absorbing and breathable layer 4 increases, the permeability of the dust-absorbing and breathable layer 4 decreases. When the permeability effect of the dust-absorbing and breathable layer 4 drops to less than the set value, it is difficult for the air in the mine to enter the induction cavity 21 through the air inlet holes 31, the dust-absorbing and breathable layer 4 and the ventilation holes 22, which is likely to affect the detection accuracy of the fiber Bragg grating sensor 1. The permeability detection component 5 can regularly detect the permeability of the dust-absorbing and breathable layer 4 and prompt the operator to replace the dust-absorbing and breathable layer 4 through the prompt module when the permeability of the dust-absorbing and breathable layer 4 is poor, which can effectively improve the convenience for the operator to replace the dust-absorbing and breathable layer 4.

[0036] It should be noted that, in the embodiment of the present application, the dust-absorbing and breathable layer 4 is made of a hard PE material, and its porous material can adsorb the dust in the air entering the induction cavity 21 in the mine.

[0037] Referring to Figure 2 , an installation groove 32 is opened at the top of the explosion-proof cover 3, a slot 33 is opened at the bottom of the installation groove 32, the dust-absorbing and breathable layer 4 is inserted into the slot 33, and a cover plate 34 is detachably installed at the top of the installation groove 32, and the cover plate 34 covers the top of the dust-absorbing and breathable layer 4.

[0038] Through the setting of the slot 33, when the dust-absorbing and breathable layer 4 needs to be replaced, the operator can detach the cover plate 34 to replace the dust-absorbing and breathable layer 4 in the slot 33, eliminating the need to disassemble the entire explosion-proof cover 3 for replacing the dust-absorbing and breathable layer 4, and improving the convenience of replacing the dust-absorbing and breathable layer 4.

[0039] Refer to Figure 3 , in the embodiment of the present application, the air permeability detection component 5 includes: an ultrasonic transmitter 51, fixedly installed on the coupling seat 2, located on one side of the dust-absorbing and breathable layer 4, for transmitting ultrasonic waves at a set time interval; an ultrasonic receiver 52, fixedly installed on the coupling seat 2, located on the side of the dust-absorbing and breathable layer 4 away from the ultrasonic transmitter 51, for receiving ultrasonic waves and outputting an ultrasonic intensity signal; a comparator, signal-connected to the signal output end of the ultrasonic receiver 52, for receiving the ultrasonic intensity signal and outputting a prompt signal when the ultrasonic intensity is less than a set value.

[0040] The ultrasonic waves emitted by the ultrasonic transmitter 51 are received by the ultrasonic receiver 52 after passing through the dust-absorbing and breathable layer 4. As the dust content attached in the dust-absorbing and breathable layer 4 increases, the intensity of the ultrasonic signal received by the ultrasonic receiver decreases. Through comparison by the comparator chip, a warning can be automatically controlled to be issued by the prompt module when the ultrasonic intensity is less than the set value, achieving the technical effect of detecting the dust content adsorbed by the dust-absorbing and breathable layer 4 and judging the air permeability of the dust-absorbing and breathable layer 4 according to the dust content adsorbed by the dust-absorbing and breathable layer 4.

[0041] It should be noted that in the embodiment of the present application, the ultrasonic transmitter 51 and the ultrasonic receiver 52 are oppositely arranged on both sides of the dust-absorbing and breathable layer 4. Since dust mainly adheres to the side of the dust-absorbing and breathable layer 4 close to the air inlet 31, the ultrasonic transmitter 51 and the ultrasonic receiver 52 are arranged relatively close to the side of the dust-absorbing and breathable layer 4 close to the air inlet 31.

[0042] In addition, in the embodiment of the present application, the ultrasonic transmitter 51 and the ultrasonic receiver 52 detect the air permeability of the dust-absorbing and breathable layer 4 at a time interval of 24 hours, and the detection period can be changed according to the needs of the use environment, which is not limited here.

[0043] Refer to Figure 1 And Figure 2 , the prompt module includes an LED lamp 6. The LED lamp 6 is fixedly installed on the coupling seat 2, and the signal input end of the LED lamp 6 is signal-connected to the signal output end of the comparator. When the air permeability of the dust-absorbing and breathable layer 4 decreases, the LED lamp 6 emits light, which can prompt the operator to replace the dust-absorbing and breathable layer 4 in time.

[0044] It should be noted that in the embodiments of the present application, a button battery is fixedly installed in the coupling base, and the button battery can supply power to the ultrasonic transmitter 51, the ultrasonic receiver 52, the comparator, and the LED lamp 6, which will not be elaborated here.

[0045] The implementation principle of a mine safety monitoring device based on fiber Bragg grating in the embodiments of the present application is as follows: During the use of the fiber Bragg grating sensor 1, as the amount of dust attached to the dust-absorbing and breathable layer 4 increases, the air permeability of the dust-absorbing and breathable layer 4 decreases. When the air permeability effect of the dust-absorbing and breathable layer 4 drops below the set value, it is difficult for the air in the mine to enter the induction cavity 21 through the air inlet hole 31, the dust-absorbing and breathable layer 4, and the ventilation hole 22, which is likely to affect the detection accuracy of the fiber Bragg grating sensor 1. The air permeability detection component 5 can regularly detect the air permeability of the dust-absorbing and breathable layer 4, and when the air permeability of the dust-absorbing and breathable layer 4 is poor, the prompting module prompts the operator to replace the dust-absorbing and breathable layer 4, which can effectively improve the convenience for the operator to replace the dust-absorbing and breathable layer 4.

[0046] The above are all the preferred embodiments of the present application. Without limiting the protection scope of the present application accordingly, therefore: Any equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A mine safety monitoring device based on fiber grating, comprising an optical fiber arranged along a mine tunnel, a light source connected to the input end of the optical fiber, a wavelength demodulator for receiving reflected light from the optical fiber, and a control host connected to the wavelength demodulator signal, characterized in that: A plurality of fiber grating sensors (1) are connected in series on the optical fiber, a plurality of the fiber grating sensors (1) are respectively fixedly mounted with coupling seats (2), and a plurality of the coupling seats (2) are respectively fixedly mounted on the wall of the mine to be tested at set intervals; The coupling seat (2) is formed with a sensing cavity (21) for mounting the sensing section of the optical fiber grating sensor (1); ventilation holes (22) are respectively provided on both sides of the coupling seat (2); the ventilation holes (22) are both communicated with the sensing cavity (21); an explosion-proof shield (3) is detachably mounted on the coupling seat (2); two dust-absorbing air-permeable layers (4) are detachably mounted inside the explosion-proof shield (3); two air inlet holes (31) are penetrated through the explosion-proof shield (3); the two air inlet holes (31) are respectively coaxial with the two air inlet holes (22); the two dust-absorbing air-permeable layers (4) are respectively located between the two air inlet holes (22) and the two air inlet holes (31); as well as: An air permeability detection component (5) is fixedly mounted on the coupling seat (2) and is located between the dust-absorbing air-permeable layer (4) and the explosion-proof shield (3), and is used to send a prompt signal when the air permeability of the dust-absorbing air-permeable layer (4) is less than a set value; The prompt module is fixedly mounted on the coupling seat (2) and is signal-connected to the signal output end of the air permeability detection component (5) for receiving the prompt signal and issuing a warning.

2. A mine safety monitoring device based on fiber grating according to claim 1, characterized in that: The top of the explosion-proof shield (3) is provided with a mounting groove (32), the bottom of the mounting groove (32) is provided with a slot (33), the dust-absorbing and breathable layer (4) is inserted into the slot (33), and the top of the mounting groove (32) is detachably provided with a cover plate (34), the cover plate (34) covers the top of the dust-absorbing and breathable layer (4).

3. A mine safety monitoring device based on fiber grating according to claim 2, characterized in that: The air permeability detection component (5) comprises: An ultrasonic wave transmitting end (51) is fixedly mounted on the coupling seat (2) and is located on one side of the dust absorbing and breathable layer (4), and is used to transmit ultrasonic waves at set time intervals; An ultrasonic receiving end (52) is fixedly mounted on the coupling seat (2) and is located on a side of the dust-absorbing and breathable layer (4) away from the ultrasonic transmitting end (51), and is used to receive ultrasonic waves and output ultrasonic intensity signals; A comparator is signal-connected to the signal output end of the ultrasonic receiving end (52), and is used to receive the ultrasonic intensity signal and output the prompt signal when the ultrasonic intensity is less than a set value.

4. A mine safety monitoring device based on fiber grating according to claim 3, characterized in that: The prompt module comprises an LED lamp (6), the LED lamp (6) is fixedly mounted on the coupling seat (2), and the signal input end of the LED lamp (6) is signal-connected to the signal output end of the comparator.

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