CN114754911A - Coal mine tunnel roof stress detector based on fiber grating sensor - Google Patents
Coal mine tunnel roof stress detector based on fiber grating sensor Download PDFInfo
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- CN114754911A CN114754911A CN202210359794.5A CN202210359794A CN114754911A CN 114754911 A CN114754911 A CN 114754911A CN 202210359794 A CN202210359794 A CN 202210359794A CN 114754911 A CN114754911 A CN 114754911A
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- 239000000835 fiber Substances 0.000 title claims abstract description 72
- 239000003245 coal Substances 0.000 title claims abstract description 59
- 238000001514 detection method Methods 0.000 claims abstract description 64
- 238000004891 communication Methods 0.000 claims abstract description 10
- 230000010365 information processing Effects 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000011897 real-time detection Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 29
- 230000008569 process Effects 0.000 description 23
- 239000000428 dust Substances 0.000 description 7
- 230000002349 favourable effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/243—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using means for applying force perpendicular to the fibre axis
- G01L1/245—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using means for applying force perpendicular to the fibre axis using microbending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention belongs to the technical field of detection equipment, and particularly relates to a coal mine tunnel roof stress detector based on a fiber grating sensor, which comprises an information processing center and a communication optical fiber, and is characterized in that: the conducting unit is arranged in the wall body and used for conducting stress uninterruptedly in real time; the detection unit, the conduction unit is located to the detecting element for stress in the incessant real-time detection coal mine tunnel, through setting up conduction unit and detecting element, carries out nondestructive test to the stress in the coal mine tunnel wall, has improved the work continuity of coal mine tunnel roof stress detector, reduces dangerous window's production, and then has improved staff's security.
Description
Technical Field
The invention belongs to the technical field of detection equipment, and particularly relates to a coal mine tunnel roof stress detector based on a fiber grating sensor.
Background
The economic development of China is rapid since the innovation, the demand of resources is increased dramatically, and particularly fossil energy mainly comprising coal is used as the main energy. However, as the amount of coal resources exploited gets larger and larger, safety problems in the coal exploitation process are gradually revealed, such as gas explosion, coal mine collapse and the like. The method has the advantages that various reasons cause coal mine accidents, if management has leaks, thought attention is not enough, measures are not implemented in place, and the like, one important reason is that stress in a mine tunnel is not detected in time, and disasters are caused to occur late, so that stress changes of a roof of a coal mine tunnel are monitored in real time, stability of the roof is judged, effective protection measures are taken in time, and the method has great practical significance for preventing frequent roof accidents.
In the prior art, the fiber grating sensor is subjected to tensile deformation through the force-measuring anchor rod, and in the tensile deformation process, the fiber grating sensor is damaged in the tensile process due to the fact that the maximum elongation rate of the fiber grating sensor is smaller than the actual elongation rate of the force-measuring anchor rod, so that the fiber grating sensor cannot continuously detect stress, a dangerous window is generated, the detection efficiency of the coal mine tunnel roof stress detector is reduced, and life threat is generated to workers.
In view of this, in order to overcome the technical problems, the invention designs a coal mine tunnel roof stress detector based on a fiber grating sensor, and solves the technical problems.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in the prior art, the fiber grating sensor is subjected to tensile deformation through the force-measuring anchor rod, and in the tensile deformation process, the fiber grating sensor is damaged in the tensile process due to the fact that the maximum elongation rate of the fiber grating sensor is smaller than the actual elongation rate of the force-measuring anchor rod, so that the fiber grating sensor cannot continuously detect stress, a dangerous window is generated, the detection efficiency of the coal mine tunnel roof stress detector is reduced, and life threat is generated to workers.
The invention provides a coal mine tunnel roof stress detector based on a fiber grating sensor, which comprises an information processing center and a communication optical fiber, and further comprises:
the conducting unit is arranged in the wall body and used for conducting stress;
and the detection unit is arranged on the conduction unit and used for detecting the stress in the coal mine roadway.
Preferably, the conductive unit includes:
the anchor rod is arranged in the wall body and is of a hollow structure with two closed ends;
the inflation valve is fixedly connected with one end, close to the wall, of the anchor rod;
the air release valve is fixedly connected with one end, close to the wall, of the anchor rod;
the first hollow pipe is fixedly connected to the anchor rod and communicated with the interior of the anchor rod;
the first through hole is formed in the anchor rod;
the first sliding block is connected with the first hollow pipe in a sliding and sealing mode;
the arc-shaped plate is hinged with the sliding block.
Preferably, the detection unit includes:
the second hollow pipe is fixedly connected to the anchor rod and communicated with the first through hole;
the second sliding sleeve is connected with the second hollow tube in a sealing and sliding manner;
the fixed plate is hinged with the second sliding sleeve, and the other end of the fixed plate is directly contacted with the arc-shaped plate;
One end of the first fiber bragg grating sensor is fixedly connected with the fixing plate, and the other end of the first fiber bragg grating sensor is fixedly connected with the anchor rod;
one end of the first spring is fixedly connected with the second sliding sleeve, and the other end of the first spring is fixedly connected with the second hollow tube.
Preferably, the conduction unit further comprises:
and one end of the second fiber grating sensor is fixedly connected with the arc-shaped plate, and the other end of the second fiber grating sensor is fixedly connected with the first sliding block.
Preferably, the method further comprises the following steps:
the dust guard plate is fixedly connected with one side, close to the wall body, of the anchor rod;
and the elastic air bag is fixedly connected with one side of the dust-proof plate close to the arc-shaped plate.
Preferably, the number of the fixing plates and the number of the first fiber bragg grating sensors are two, and the fixing plates and the first fiber bragg grating sensors are symmetrically arranged on two sides of the second hollow tube.
Preferably, the detection unit is located between the two arc-shaped plates.
Preferably, the number of the conduction units and the number of the detection units are four, and the conduction units and the detection units are symmetrically distributed around the anchor rod.
Preferably, the conduction unit and the detection unit are arranged in two groups along the axial direction of the anchor rod.
Preferably, the dustproof plate is provided with a dustproof cover plate at the position of the through hole I.
The invention has the following beneficial effects:
1. according to the coal mine tunnel roof stress detector based on the fiber bragg grating sensor, the conducting unit and the detecting unit are arranged to detect the stress in the coal mine tunnel wall, and compared with the prior art that the stress cannot be continuously detected due to the fact that the anchor rod deforms after the stress is detected, the working continuity of the coal mine tunnel roof stress detector is improved, the dangerous window is reduced, and the safety of workers is improved.
2. According to the coal mine tunnel roof stress detector based on the fiber bragg grating sensor, the second hollow tube, the second sliding sleeve and the fixing plate are arranged, so that the stress to be detected is transmitted to the fixing plate.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a body diagram of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is an enlarged view at A in FIG. 2;
FIG. 4 is an enlarged view at B in FIG. 2;
in the figure: the device comprises an information processing center 1, a communication optical fiber 2, a conduction unit 3, an anchor rod 31, an inflation valve 311, an air release valve 312, a first hollow tube 32, a first through hole 33, a first sliding block 34, an arc-shaped plate 35, a second fiber grating sensor 36, a wall 4, a detection unit 5, a second hollow tube 51, a second sliding sleeve 52, a fixing plate 53, a first fiber grating sensor 54, a first spring 55, a dust-proof plate 6, an elastic air bag 61 and a dust-proof cover plate 62.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete description of the technical solutions in the embodiments of the present invention, it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The coal mine tunnel roof stress detector based on the fiber bragg grating sensor in the prior art has the following defects: in the prior art, the fiber grating sensor is subjected to tensile deformation through the force-measuring anchor rod, and in the tensile deformation process, the fiber grating sensor is damaged in the tensile process due to the fact that the maximum elongation rate of the fiber grating sensor is smaller than the actual elongation rate of the force-measuring anchor rod, so that the fiber grating sensor cannot continuously detect stress, and a dangerous window is generated, so that the detection efficiency of the coal mine tunnel roof stress detector is reduced, and life threat is generated to workers.
In order to solve the above problems, the present embodiment adopts the following main concepts: the stress in the wall body 4 is detected through the conduction unit 3 and the detection unit 5, the phenomenon that a sensor in a roof stress detector of a coal mine roadway is damaged is reduced, and then detection data are transmitted to the information processing center 1 through the communication optical fiber 2 to be processed and analyzed.
Therefore, in order to better understand the technical scheme, the following detailed description is made in conjunction with the drawings and the detailed description of the specification:
the invention provides a coal mine tunnel roof stress detector based on a fiber grating sensor, which comprises an information processing center 1 and a communication fiber 2, and further comprises:
the conduction unit 3 is arranged in the wall 4 and used for continuously conducting stress in real time;
the detection unit 5 is arranged on the conduction unit 3 and is used for uninterruptedly detecting the stress in the coal mine roadway in real time;
when the stress in the coal mine tunnel during normal working needs to be monitored in real time, a hole needs to be punched on a wall 4 of the coal mine tunnel by using a punching machine, then the conduction unit 3 is installed in the hole, and the detection unit 5 on the conduction unit 3 transmits the conduction unit 3 to the stress in the wall 4 of the coal mine tunnel of the detection unit 5 for real-time monitoring;
compared with the prior art, the invention has the advantages that the stress in the wall body 4 of the coal mine tunnel is uninterruptedly detected in real time by arranging the conduction unit 3 and the detection unit 5, the working continuity of the stress detector for the roof plate of the coal mine tunnel is improved, the generation of dangerous windows is reduced, and the safety of workers is improved.
As an embodiment of the present invention, the conduction unit 3 includes:
the anchor rod 31 is arranged in the wall 4, and the anchor rod 31 is of a hollow structure with two closed ends;
the inflation valve 311 is fixedly connected with one end, close to the wall 4, of the anchor rod 31;
the air release valve 312, the air release valve 312 is fixedly connected with one end of the anchor rod 31 close to the wall 4;
the first hollow pipe 32 is fixedly connected to the anchor rod 31, and is communicated with the inside of the anchor rod 31;
a first through hole 33, wherein the first through hole 33 is arranged in the anchor rod 31;
the first sliding block 34 is connected with the first hollow pipe 32 in a sliding and sealing mode;
the arc-shaped plate 35 is hinged with the sliding block 34;
in the process of installing the anchor rod 31 in the wall 4, high-pressure gas is introduced into the anchor rod 31 in the conduction unit 3, in the process of introducing the high-pressure gas, the high-pressure gas enters the anchor rod 31 from the inflation valve 311, flows along the first hollow tube 32, pushes the first slide block 34 and the arc-shaped plate 35 in the contraction state to extend outwards along the radial direction, after the arc-shaped plate 35 is contacted with the inner wall of the hole of the wall 4, air in the anchor rod 31 is continuously pressurized until the pressure of the arc-shaped plate 35 and the inner wall of the hole of the wall 4 reaches a detection value of stress detection, the pressurization is stopped, then the detection unit 5 arranged along the first through hole 33 starts to work, when the stress exceeds the detection value, the arc-shaped plate 35 extrudes the first slide block 34 to slide along the axial direction of the first hollow tube 32 after the interaction of the stress and the gas pressure set in the anchor rod 31, the detection unit 5 is transmitted to carry out detection, and is transmitted to the information processing center 1 through the communication optical fiber 2 to carry out analysis and implement corresponding measures, in the process of detecting the stress, the controller controls the air release valve 312 to release the redundant gas in the anchor rod 31, so that the pressure in the anchor rod 31 is kept consistent with the stress detection value, and further, the stress of the wall 4 is continuously conducted and is detected by the detection unit 5;
In the process of transmitting the stress to the detection unit 5, the stress is transmitted to the detection unit 5 through the matching of the first sliding block 34, the arc-shaped plate 35 and the first hollow pipe 32, compared with a force measuring anchor rod in the prior art, the stress of the wall 4 can be continuously transmitted and detected by the detection unit 5 after the stress is measured by the coal mine tunnel roof stress detector, the phenomenon that a dangerous window appears due to the replacement of a detection device is reduced, the safety factor of workers is further improved, and the actual using effect of the coal mine tunnel roof stress detector is improved.
As an embodiment of the present invention, the detection unit 5 includes:
the second hollow pipe 51, the second hollow pipe 51 is fixedly connected to the anchor rod 31 and is communicated with the first through hole 33;
a second sliding sleeve 52, wherein the second sliding sleeve 52 is connected with a second hollow pipe 51 in a sealing and sliding manner;
the fixed plate 53 is hinged with the second sliding sleeve 52, and the other end of the fixed plate 53 is in direct contact with the arc-shaped plate 35;
one end of the first fiber grating sensor 54 is fixedly connected with the fixing plate 53, and the other end of the first fiber grating sensor 54 is fixedly connected with the anchor rod 31;
one end of the first spring 55 is fixedly connected with the second sliding sleeve 52, and the other end of the first spring 55 is fixedly connected with the second hollow tube 51;
In the process of installing the conduction unit 3 and the detection unit 5 into the wall 4, the first spring 55 restores to the original state to pull up the fixing plate 53 and the first fiber grating sensor 54 to the normal state;
when the detection unit 5 is installed, the first spring 55 jacks the second sliding sleeve 52, so that the fixing plate 53 and the first fiber grating sensor 54 are restored to the working state;
in the detection process, the first sliding block 34 is driven by the arc-shaped plate 35 to slide along the first hollow tube 32, the fixed plate 53 on the second sliding sleeve 52 is pressed by the arc-shaped plate 35 in the sliding process, the second sliding sleeve 52 slides along the second hollow tube 51, the first fiber grating sensor 54 moves downwards along with the fixed plate 53, the first fiber grating sensor 54 is compressed in the moving process to generate a light wave signal with shrinkage deformation, and the generated light wave signal is transmitted to the information processing center 1 through the communication optical fiber 2 to be processed and analyzed;
through setting up No. two hollow tubes 51, No. two sliding sleeves 52 and fixed plate 53, make the stress transmission that needs detect to fixed plate 53 on, turn into compressive deformation with the tensile deformation of sensor, compare with tensile formula stress detection device among the prior art, the actual elongation of having avoided a fiber grating sensor 54 maximum elongation to be less than the dynamometry stock leads to stress detection device impaired, the phenomenon that coal mine tunnel roof stress detector damaged has been reduced, the actual life of coal mine tunnel roof stress detector has been improved.
As an embodiment of the present invention, the conduction unit 3 further includes:
one end of the second fiber grating sensor 36 is fixedly connected with the arc-shaped plate 35, and the other end of the second fiber grating sensor 36 is fixedly connected with the first sliding block 34;
when the first sliding block 34 drives the arc-shaped plate 35 to slide along the first hollow tube 32 to be attached to the inner wall of the wall 4, the first sliding block 34 and the second fiber bragg grating sensors 36 on the two sides of the arc-shaped plate 35 start to work to detect the stress in the wall 4, and collected detection information is transmitted to the information processing center 1 through the communication optical fiber 2 when the arc-shaped plate 35 is extruded by the stress;
through setting up fiber grating sensor No. two 36, cooperate with fiber grating sensor No. one 54 and carry out contrastive analysis to the information for further confirm the direction of stress source, and then propose the solution of pertinence, improved coal mine tunnel roof stress detector and detected the precision, and then further improved the security of staff during operation.
As a specific embodiment of the present invention, the method further includes:
the dustproof plate 6 is fixedly connected with one side, close to the wall 4, of the anchor rod 31;
the elastic air bag 61 is fixedly connected with one side, close to the arc-shaped plate 35, of the dust-proof plate 6;
When the arc 35 slides and supports the in-process with stock 31 along with a slider 34 to the direction of keeping away from stock 31, the arc 35 extrudees elasticity gasbag 61 in the slip in-process, makes elasticity gasbag 61 inflation, is favorable to reducing the space between dust guard 6 and the arc 35, reduces the probability that the colliery dust got into conduction unit 3 and detecting element 5, and then reduces the influence to the testing result to improve the detection quality of colliery tunnel roof stress detector.
As a specific embodiment of the present invention, the number of the fixing plates 53 and the first fiber bragg grating sensors 54 is two, and the fixing plates and the first fiber bragg grating sensors are symmetrically arranged on two sides of the second hollow tube 51;
in the process of detecting stress, the fixing plates 53 and the first fiber grating sensor 54 which are symmetrically arranged on two sides of the second hollow tube 51 are respectively contacted with the corresponding arc-shaped plates 35 in the process of detecting stress, when the stress acts on the fixing plate 53 and the first fiber grating sensor 54 on one side, the fixing plate 53 and the first fiber grating sensor 54 on the other side cannot generate the same signal, and the fixing plates are matched with the second fiber grating sensor 36 to further determine the size and the direction of the stress, so that the detection quality of the detector for detecting the stress of the top plate of the coal mine roadway is further improved.
As a specific embodiment of the present invention, the detecting unit 5 is located between the two arc-shaped plates 35;
arrange detecting element 5 in between two arcs 35, make detecting element 5 can detect the stress that comes from two above directions, compare with the wire rope of changing hollow stock department among the prior art or change detection device, be favorable to reducing coal mine tunnel roof stress detector manufacturing cost, and then reduce coal mine tunnel roof stress detector's use cost.
As a specific embodiment of the present invention, the number of the conduction units 3 and the detection units 5 is four, and the conduction units and the detection units are symmetrically distributed around the anchor rod 31;
the transmission units 3 and the detection units 5 distributed around the anchor rod 31 are used for detecting stress around the wall 4, so that the detection range of the coal mine tunnel roof stress detector is enlarged, and the detection quality of the coal mine tunnel roof stress detector is improved.
As a specific embodiment of the present invention, the conduction unit 3 and the detection unit 5 are arranged in two sets along the axial direction of the anchor rod 31;
through set up two sets ofly with conduction unit 3 and detecting element 5 along stock 31 axial, be favorable to improving the detection range of coal mine tunnel roof stress detector at wall 4 depth, and further improve coal mine tunnel roof stress detector in-service use effect.
As a specific embodiment of the present invention, the dust-proof plate 6 is provided with a dust-proof cover plate 62 at the position of the first through hole 33;
through the dust cover plate 62 that sets up in No. 6 through-hole 33 departments of dust guard, make coal mine tunnel roof stress detector reduce the dust and get into conduction unit 3 and detecting element 5 in from No. 33 through-hole in the use, further reduce the probability that the coal mine dust got into conduction unit 3 and detecting element 5 to further improve the detection quality of coal mine tunnel roof stress detector.
The specific working process is as follows:
when the stress in the coal mine tunnel during normal operation needs to be monitored in real time, a hole needs to be punched on a wall 4 of the coal mine tunnel by using a punching machine, then the conduction unit 3 is arranged in the hole, high-pressure gas is introduced into the anchor rod 31 in the conduction unit 3 in the process of being arranged in the wall 4, the high-pressure gas enters the anchor rod 31 from the inflation valve 311 and flows along the hollow pipe 32 to push the first slide block 34 and the arc-shaped plate 35 which are in the contraction state to extend outwards along the radial direction, the arc-shaped plate 35 slides and expands along the first slide block 34 in the direction far away from the anchor rod 31 and supports the anchor rod 31, the elastic airbag 61 fixedly connected with one side of the dust-proof plate 6 close to the arc-shaped plate 35 is extruded while the arc-shaped plate 35 slides in the direction far away from the center of the circle, so that the elastic airbag 61 deforms and expands, and shields a gap between the arc-shaped plate 35 and the dust-proof plate 6, after the arc-shaped plate 35 is contacted with the inner wall of the hole of the wall 4, the air in the anchor rod 31 is continuously pressurized until the pressure of the arc-shaped plate 35 and the inner wall of the hole of the wall 4 reaches the detection value of stress detection, the pressurization is stopped, and meanwhile, the first spring 55 jacks up the second sliding sleeve 52, so that the fixing plate 53 and the first fiber bragg grating sensor 54 are restored to the working state;
Then, the detection unit 5 arranged along the first through hole 33 starts to work, when the stress exceeds the detection value, the arc-shaped plate 35 extrudes the first sliding block 34 to axially slide along the first hollow pipe 32 after the stress interacts with the gas pressure set in the anchor rod 31, and meanwhile, in the process of detecting the stress, the controller controls the air release valve 312 to release the redundant gas in the anchor rod 31, so that the pressure in the anchor rod 31 is kept consistent with the detection value, further, the stress of the wall 4 is continuously conducted, and the detection unit 5 detects the stress;
then the arc-shaped plate 35 presses the fixing plate 53 on the sliding sleeve 52 II in the sliding process, so that the sliding sleeve 52 II slides along the hollow tube 51 II, the fiber grating sensor 54I moves downwards along with the fixing plate 53, the fiber grating sensor 54I is compressed in the moving process, the sliding block 34I and the fiber grating sensor 36 II on the two sides of the arc-shaped plate 35 begin to work, the stress in other directions in the wall body 4 is detected, and the compressed fiber grating sensor 54I and the compressed fiber grating sensor 36 generate light wave signals in the compressing process, and the light wave signals are transmitted to the information processing center 1 through the communication optical fiber 2 for processing and analysis;
after the stress detection is completed, the controller controls the air release valve 312 to release the redundant gas in the anchor rod 31, so that the pressure in the anchor rod 31 is kept consistent with the stress detection value, and further, the stress of the wall 4 is continuously conducted and is detected by the detection unit 5.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a colliery tunnel roof stress detector based on fiber grating sensor, includes information processing center (1), communication optic fibre (2), its characterized in that: further comprising:
the conduction unit (3) is arranged in the wall body (4) and used for conducting stress;
the detection unit (5) is arranged on the conduction unit (3) and used for detecting the stress in the coal mine roadway.
2. The coal mine roadway roof stress detector based on the fiber grating sensor, according to claim 1, is characterized in that: the conductive unit (3) includes:
the anchor rod (31) is arranged in the wall body (4), and is of a hollow structure with two closed ends;
The inflation valve (311), the inflation valve (311) is fixedly connected with one end, close to the wall body (4), of the anchor rod (31);
the air release valve (312), the air release valve (312) and one end of the anchor rod (31) close to the wall body (4) are fixedly connected (1);
the first hollow pipe (32), the first hollow pipe (32) is fixedly connected to the anchor rod (31) and communicated with the interior of the anchor rod (31);
the first through hole (33), the first through hole (33) is arranged in the anchor rod (31);
the first sliding block (34) is connected with the first hollow pipe (32) in a sliding and sealing mode;
the arc-shaped plate (35), the arc-shaped plate (35) is hinged with the sliding block (34).
3. The coal mine roadway roof stress detector based on the fiber grating sensor as claimed in claim 1, wherein: the detection unit (5) comprises:
the second hollow pipe (51), the second hollow pipe (51) is fixedly connected to the anchor rod (31) and communicated with the first through hole (33);
the second sliding sleeve (52), the second sliding sleeve (52) is connected with the second hollow pipe (51) in a sealing and sliding manner;
the fixed plate (53) is hinged with the second sliding sleeve (52), and the other end of the fixed plate (53) is directly contacted with the arc-shaped plate (35);
one end of the first fiber bragg grating sensor (54) is fixedly connected with the fixing plate (53), and the other end of the first fiber bragg grating sensor (54) is fixedly connected with the anchor rod (31);
One end of the first spring (55) is fixedly connected with the second sliding sleeve (52), and the other end of the first spring (55) is fixedly connected with the second hollow tube (51).
4. The coal mine roadway roof stress detector based on the fiber grating sensor, according to claim 2, is characterized in that: the conduction unit (3) further comprises:
and one end of the second fiber grating sensor (36) is fixedly connected with the arc-shaped plate (35), and the other end of the second fiber grating sensor (36) is fixedly connected with the first sliding block (34).
5. The coal mine roadway roof stress detector based on the fiber grating sensor, according to claim 2, is characterized in that: further comprising:
the dustproof plate (6) is fixedly connected with one side, close to the wall body (4), of the anchor rod (31);
and the elastic air bag (61) is fixedly connected with one side of the dust-proof plate (6) close to the wall body (4).
6. The coal mine roadway roof stress detector based on the fiber grating sensor, according to claim 3, is characterized in that: the number of the fixing plates (53) and the number of the first fiber bragg grating sensors (54) are two, and the fixing plates and the first fiber bragg grating sensors are symmetrically arranged on two sides of the second hollow tube (51).
7. The coal mine roadway roof stress detector based on the fiber grating sensor, according to claim 5, is characterized in that: the detection unit (5) is positioned between the two arc-shaped plates (35).
8. The coal mine roadway roof stress detector based on the fiber grating sensor, according to claim 5, is characterized in that: the number of the conduction units (3) and the number of the detection units (5) are four, and the conduction units and the detection units are symmetrically distributed around the anchor rod (31).
9. The coal mine roadway roof stress detector based on the fiber grating sensor, according to claim 8, is characterized in that: the conduction units (3) and the detection units (5) are arranged in two groups along the axial direction of the anchor rod (31).
10. The coal mine roadway roof stress detector based on the fiber grating sensor, according to claim 5, is characterized in that: and the dustproof plate (6) is positioned at the first through hole (33) and is provided with a dustproof cover plate (62).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210359794.5A CN114754911A (en) | 2022-04-06 | 2022-04-06 | Coal mine tunnel roof stress detector based on fiber grating sensor |
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| CN202210359794.5A CN114754911A (en) | 2022-04-06 | 2022-04-06 | Coal mine tunnel roof stress detector based on fiber grating sensor |
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| CN202210359794.5A Pending CN114754911A (en) | 2022-04-06 | 2022-04-06 | Coal mine tunnel roof stress detector based on fiber grating sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115638908A (en) * | 2022-09-30 | 2023-01-24 | 海纳云物联科技有限公司 | Stress monitoring equipment based on fiber grating sensor |
| CN117647340A (en) * | 2024-01-30 | 2024-03-05 | 成都工业职业技术学院 | Mining roof pressure detection device based on optical fiber sensor |
Citations (13)
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