Mining fiber bragg grating strain sensor fixer

Abstract

The utility model discloses a fixing device for a mining fiber grating strain sensor, which belongs to the technical field of mining line fittings and comprises a lower seat and an upper seat which are matched with each other. A positioning drill rod is vertically arranged in the middle of the bottom surface of the lower seat; fixing through holes are formed in two sides of the positioning drill rod on the lower seat; a lower through groove is transversely formed in the top face of the lower base, threaded through holes are oppositely formed in the two sides of the lower through groove, and the threaded through holes are formed between the fixing through hole and the lower through groove. An upper through groove matched with the lower through groove is formed in the bottom face of the upper base, the lower through groove and the upper through groove are matched to form a wire clamping channel, assembling through holes matched with the threaded through holes for use are formed in the two sides of the upper through groove, and bolts are arranged in the threaded through holes in a matched mode. The fiber bragg grating strain sensor can be fixed on the inner wall of a mine through the fixing device, the fixing device can be conveniently assembled on the inner wall of the mine for monitoring operation, damage to the fiber bragg grating strain sensor caused by an installation structure and an installation method is reduced, and the repeated utilization rate of the fiber bragg grating strain sensor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mine line accessories, in particular to a fixing device for fixing a fiber grating sensor on the inner wall of a mine. Background Art

[0002] Grating fiber strain sensor is a fiber sensing technology based on grating technology, which can be used to measure the deformation and strain of materials. This sensor uses the interference principle of grating to convert optical signals into electrical signals, thereby realizing the monitoring of materials. Grating fiber strain sensor is usually composed of optical fiber, grating and reader. Among them, optical fiber is a material that transmits optical signals, and grating is an optical element with a periodic structure, which is used to convert optical signals into electrical signals. The reader is used to read the interference signal in the grating and convert it into an electrical signal. Grating fiber strain sensor can be applied to a variety of scenarios in mines, such as monitoring the deformation of the shaft wall, monitoring the displacement of the ore body, and monitoring the ground subsidence. These sensors can accurately measure various strains and provide important data support for the safe operation of the mine. In the mine, grating fiber strain sensor can be used in combination with other technologies such as video monitoring system and ground monitoring equipment to realize all-round monitoring of the mine. The data collected by these sensors can monitor the condition of the mine in real time, and timely discover potential safety risks, so as to avoid accidents. In addition, grating fiber strain sensor can also be used to monitor the ventilation of the mine to ensure the air quality of the mine. In mines, ventilation is very important because harmful gases and dust in mines can cause harm to workers. By using grating fiber strain sensors, wind speed and air quality in mines can be monitored to ensure good ventilation in mines. In short, grating fiber strain sensors are widely used in mines to improve the safety, reliability and efficiency of mines.

[0003] Usually, if Figure 1 The fiber Bragg grating sensor used in the mine needs to be fixed to the inner wall of the mine when in use. The traditional operation method is that the operator directly sticks the bare fiber Bragg grating strain sensor on the wall of the coal mine with a high-strength adhesive, and then removes the bonding part after the use to reuse the sensor. In this traditional fixing method, the bonding quality of the adhesive will not only directly affect the data transmission of the bonding layer, but also the high-strength adhesive remaining on the surface of the fiber Bragg grating strain sensor after use will affect the function of the fiber Bragg grating strain sensor even if it is removed. There is a technical problem that the fixing strength of the fiber Bragg grating sensor and convenient reuse cannot be taken into account at the same time. Utility Model Content

[0004] In traditional technology, the fiber grating strain sensor is connected to the wall of a coal mine using a high-strength adhesive, which has the technical defect of not being able to take into account both fixing strength and convenient reuse.

[0005] In view of at least one of the above technical problems, the utility model provides a fiber Bragg grating strain sensor fixture for mining, through which the fiber Bragg grating strain sensor is fixed on the inner wall of the mine, which can be conveniently installed on the inner wall of the mine for monitoring operations, while reducing the damage and destruction of the fiber Bragg grating strain sensor caused by the installation structure and installation method, and improving the reuse rate of the fiber Bragg grating strain sensor. The specific technical solution is as follows:

[0006] A fiber grating strain sensor fixture for mining, comprising a matching lower seat and an upper seat; a positioning rod is vertically provided in the middle of the bottom surface of the lower seat, and the lower seat is provided with fixing through holes on both sides of the positioning rod; a lower through groove is horizontally provided on the top surface of the lower seat, and threaded through holes are oppositely provided on both sides of the lower through groove, and the threaded through holes are arranged between the fixing through holes and the lower through groove; an upper through groove is provided on the bottom surface of the upper seat to match the lower through groove, and the lower through groove cooperates with the upper through groove to form a wire clamping channel, and assembly through holes matching the threaded through holes are provided on both sides of the upper through groove, and the threaded through holes are provided with bolts.

[0007] In some embodiments of the present disclosure, the cross-section of the positioning drill is circular, and the outer end of the positioning drill is a conical structure.

[0008] In some embodiments of the present disclosure, a boss is provided in the middle of the upper surface of the lower seat, the fixing through hole is provided on the outer side of the boss, the lower through groove is provided on the upper surface of the boss, and the threaded through hole is provided on the boss.

[0009] In some embodiments of the present disclosure, the upper seat and the boss have outer contour shapes that are geometrically similar.

[0010] In some embodiments of the present disclosure, the lower through groove is an arc-bottomed through groove.

[0011] In some embodiments of the present disclosure, the upper through groove is an arc-bottomed through groove.

[0012] In some embodiments of the present disclosure, the depth of the lower through groove is no greater than half of the width of the lower through groove.

[0013] In some embodiments of the present disclosure, the depth of the upper through groove is no greater than half of the width of the upper through groove.

[0014] In some embodiments of the present disclosure, an inner wall of the wire clamping channel is provided with an anti-slip structure.

[0015] In some embodiments of the present disclosure, the anti-skid structure is at least one of an anti-skid groove, an anti-skid pattern or an anti-skid pad.

[0016] Compared with the prior art, the above-mentioned mining fiber Bragg grating strain sensor holder has the following beneficial effects:

[0017] When in use, the lower seat is positioned on the inner wall of the mine by a positioning drill, and is fixed to the inner wall of the mine by fitting conventional connectors through fixed through holes. After the fiber grating strain sensor is placed in the lower through groove, the upper seat and the lower seat can be assembled and connected to achieve clamping and fixing of the fiber grating strain sensor, thereby achieving the purpose of fixing the fiber grating strain sensor on the inner wall of the mine. This structure can achieve convenient disassembly and assembly while ensuring a stable connection, reduce the damage and destruction of the fiber grating strain sensor caused by the installation structure and installation method, and effectively improve the reuse rate of the fiber grating strain sensor.

[0018] The setting of the positioning rod can realize the overall accurate positioning of the fixture inside the mine, which is convenient for unified planning of the height of each part of the optical fiber, and can reduce the distortion of the optical fiber as much as possible, thereby extending the service life of the optical fiber;

[0019] The structure of the fixture is intuitive, the lower seat and the upper seat are easy to disassemble and assemble, there is no complicated transmission coordination, the structure has strong integrity, and it can be directly manufactured by drilling and milling machines, with low manufacturing cost and use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the three-dimensional structure of the fiber Bragg grating strain sensor;

[0021] Figure 2 It is a three-dimensional schematic diagram of Example 2 in the structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the explosion of the structure of Example 2 of the utility model;

[0023] Figure 4 A perspective diagram of the structure of the utility model, in which Embodiment 2 and the fiber Bragg grating strain sensor are assembled;

[0024] Figure 5 In the perspective 2 of the structure of the utility model, Figure 4 Exploded view of the structure shown with the bolts removed.

[0025] Explanation of the numbers in the figure: 1. lower seat; 11. positioning drill; 12. fixing through hole; 13. lower through groove; 14. threaded through hole; 15. boss; 2. upper seat; 21. upper through groove; 22. assembly through hole; 3. wire clamping channel; 4. bolt. DETAILED DESCRIPTION

[0026] In order to better understand the purpose, structure and function of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below.

[0027] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "provided with" and any variations thereof in this application are open-ended and are intended to cover non-exclusive inclusions.

[0028] The serial numbers assigned to the components herein are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" mentioned in this disclosure, unless otherwise specified, includes both direct and indirect "connections". In the description of this application, it should be understood that the directions or positional relationships indicated by the directional terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "outer", etc. can refer to the attached Figure 2 The orientation or positional relationship shown is only for the convenience of description, and does not indicate or imply that the device or unit referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] As shown in the attached figure Figures 2 to 5 As shown, a holder for a fiber grating strain sensor for mining is designed, comprising a lower seat 1 and an upper seat 2; a positioning drill 11 is vertically arranged in the middle of the bottom surface of the lower seat 1, and the arrangement of the positioning drill 11 can realize the overall accurate positioning of the holder inside the mine, facilitate the unified planning of the height of each part of the optical fiber, reduce the distortion of the optical fiber as much as possible, and extend the service life of the optical fiber. The positioning drill 11 and the lower seat 1 are an integrally formed structure, which can be directly processed by a lathe during manufacturing. The lower seat 1 is provided with fixing through holes 12 for connecting to the inner wall of the mine on both sides of the positioning drill 11; a lower through groove 13 is transversely arranged on the top surface of the lower seat 1, and threaded through holes 14 are arranged on both sides of the lower through groove 13, and the threaded through holes 14 are arranged between the fixing through holes 12 and the lower through groove 13; an upper through groove 21 adapted to the lower through groove 13 is arranged on the bottom surface of the upper seat 2, and the lower through groove 13 cooperates with the upper through groove 21 to form a clamping Figure 1 The fiber Bragg grating strain sensor shown has a wire clamping channel 3, and both sides of the upper through groove 21 are provided with assembly through holes 22 matched with the threaded through holes 14, and the threaded through holes 14 are provided with bolts 4; the structure of the fixture design is intuitive, the lower seat 1 and the upper seat 2 are easy to disassemble and assemble, there is no cumbersome transmission coordination, the structure has strong integrity, and it can be directly manufactured by drilling and milling machine tools, with low manufacturing cost and use cost.

[0030] When in use, first mark the installation position on the inner wall of the mine, drill a hole on the inner wall of the mine, insert the positioning pin 11 into the drilled hole, and then select a suitable fixing point in the position range corresponding to the fixing through hole 12, and the lower seat 1 can be fixed to the inner wall of the mine by expansion screws or wall screws; after the fiber optic Bragg grating strain sensor is placed with the lower through groove 13, the threaded through hole 14 and the assembly through hole 22 can be aligned and the bolt 4 can be screwed in to assemble and connect the upper seat 2 and the lower seat 1, so as to clamp and fix the fiber optic Bragg grating strain sensor, thereby achieving the purpose of fixing the fiber optic Bragg grating strain sensor on the inner wall of the mine. The structure is mostly threaded connection, which can ensure convenient disassembly and assembly under the premise of stable connection. When disassembling, the thread reverses, and no adhesives such as super glue are involved, which reduces the damage and destruction of the fiber optic Bragg grating strain sensor caused by the installation structure and installation method, and effectively improves the reuse rate of the fiber optic Bragg grating strain sensor.

[0031] In the above implementation mode, three embodiments are listed to implement the above technical solution. The reference to "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. In the absence of conflict, the various embodiments in the present application can be combined with each other.

[0032] Embodiment 1 discloses a fiber Bragg grating strain sensor fixture for mining, including a lower seat 1 and an upper seat 2, the bottom surface of the lower seat 1 is a plane, and the lower seat 1 and the upper seat 2 can be stainless steel structures; a positioning rod 11 is vertically arranged in the middle of the bottom surface of the lower seat 1, and the diameter of the positioning rod 11 is not less than 0.5 cm, and this embodiment adopts 1 cm. The positioning rod 11 is perpendicular to the bottom surface of the lower seat 1. The setting of the positioning rod 11 can realize the overall accurate positioning of the fixture inside the mine, facilitate the unified planning of the height of each part of the optical fiber, minimize the distortion of the optical fiber, extend the service life of the optical fiber, and position the optical fiber. The drill 11 and the lower seat 1 are an integrally formed structure, which can be directly processed by a lathe during manufacturing. The lower seat 1 is provided with fixing through holes 12 for connecting to the inner wall of the mine on both sides of the positioning drill 11, which can be equipped with screws or expansion screws when in use; a lower through groove 13 is transversely provided on the top surface of the lower seat 1, and threaded through holes 14 are arranged on both sides of the lower through groove 13, and the threaded through holes 14 are arranged between the fixing through holes 12 and the lower through groove 13; an upper through groove 21 is provided on the bottom surface of the upper seat 2 to match the lower through groove 13, and the lower through groove 13 cooperates with the upper through groove 21 to form a clamping Figure 1The fiber grating strain sensor shown has a wire clamping channel 3, which is perpendicular to the positioning drill 11. Both sides of the upper through groove 21 are provided with assembly through holes 22 that match the threaded through hole 14. The threaded through hole 14 is provided with a bolt 4, which passes through the assembly through hole 22 and matches with the threaded through hole 14. The screw length of the bolt 4 is less than the sum of the thickness of the lower seat 1 and the upper seat 2. The structure of the fixture design is intuitive. The lower seat 1 and the upper seat 2 are connected by bolts 4, and the lower seat 1 and the inner wall of the mine are connected by screws or expansion screws. They are all threaded matching structures, which are easy to disassemble and assemble, and there is no cumbersome transmission matching. The structural integrity is strong, and the lower seat 1 and the upper seat 2 can be directly manufactured by drilling and milling machine tools, with low manufacturing cost and use cost.

[0033] In this embodiment, the cross section of the positioning rod 11 is a regular polygon, which can effectively prevent the lower seat 1 from twisting; the lower through groove 13 is an arc-bottomed through groove, and the upper through groove 21 is a V-shaped bottomed through groove, so as to clamp the outer surface of the fiber grating.

[0034] like Figures 2 to 5 As shown, the second embodiment discloses a fiber Bragg grating strain sensor fixture for mining. When in use, two of the present design can be used in pairs at both ends of the fiber Bragg grating sensor. The difference between this embodiment and the first embodiment is that the cross section of the positioning rod 11 is circular, and the outer end of the positioning rod 11 is a conical structure; a boss 15 is provided in the middle of the upper surface of the lower seat 1, the fixing through hole 12 is provided on the outer side of the boss 15, the lower through groove 13 is provided on the upper surface of the boss 15, and the threaded through hole 14 is provided on the boss 15, which can effectively reduce the weight of the lower seat 1; the upper seat 2 and The outer contour of the boss 15 is geometrically similar, so that the lower seat 1 and the upper seat 2 have a stronger integrity after being matched, which can effectively prevent side scratches and have a higher safety factor; the lower through groove 13 is a circular arc bottom through groove, and the upper through groove 21 is a circular arc bottom through groove, which can achieve clamping of the outer surface of the fiber grating; the groove depth of the lower through groove 13 is not greater than half of the width of the lower through groove 13; the groove depth of the upper through groove 21 is not greater than half of the width of the upper through groove 21, so that the wire clamping channel 3 forms a structure similar to an ellipse, and the fiber grating sensor can be fastened and clamped by bolts 4.

[0035] To further optimize the design, the inner wall of the wire clamping channel 3 is provided with an anti-slip structure.

[0036] Embodiment 3 discloses a fiber optic Bragg grating strain sensor holder for mining. The difference between this embodiment and embodiment 2 is that the cross-section of the positioning rod 11 is elliptical, and the positioning rod 11 is a tapered rod with a thick root and a thin end, which can effectively prevent the lower seat 1 from twisting; the inner wall of the wire clamping channel 3 is provided with an anti-slip structure, and the anti-slip structure can be at least one of an anti-slip groove, an anti-slip pattern or an anti-slip pad, or the lower through groove 13 and the upper through groove 21 can be differentiated to achieve the basic purpose of anti-slip after the wire clamping channel 3 is matched with the fiber optic Bragg grating sensor.

[0037] It can be understood that the above description is only for illustrating the specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the disclosure scope of the present application.

Claims

1. A fiber grating strain sensor holder for mining, characterized in that: The utility model comprises a lower seat (1) and an upper seat (2) for use; a positioning drill (11) is vertically provided in the middle of the bottom surface of the lower seat (1), and the lower seat (1) is provided with fixing through holes (12) on both sides of the positioning drill (11); a lower through groove (13) is horizontally provided on the top surface of the lower seat (1), and threaded through holes (14) are oppositely provided on both sides of the lower through groove (13), and the threaded through holes (14) are arranged between the fixing through holes (12) and the lower through groove (13); an upper through groove (21) is provided on the bottom surface of the upper seat (2) and is matched with the lower through groove (13), and the lower through groove (13) cooperates with the upper through groove (21) to form a wire clamping channel (3), and assembly through holes (22) for matching with the threaded through holes (14) are provided on both sides of the upper through groove (21), and the threaded through holes (14) are equipped with bolts (4).

2. The optical fiber Bragg grating strain sensor holder for mining according to claim 1, characterized in that: The cross section of the positioning pin (11) is circular, and the outer end of the positioning pin (11) is a conical structure.

3. The optical fiber Bragg grating strain sensor holder for mining according to claim 1, characterized in that: A boss (15) is provided in the middle of the upper surface of the lower seat (1), the fixing through hole (12) is provided on the outer side of the boss (15), the lower through groove (13) is provided on the upper surface of the boss (15), and the threaded through hole (14) is provided on the boss (15).

4. The optical fiber Bragg grating strain sensor holder for mining according to claim 3, characterized in that: The outer contour shapes of the upper seat (2) and the boss (15) are geometrically similar.

5. The optical fiber Bragg grating strain sensor holder for mining according to claim 1, characterized in that: The lower through groove (13) is an arc-bottomed through groove.

6. The mining fiber Bragg grating strain sensor holder according to claim 5, characterized in that: The upper through groove (21) is an arc-bottomed through groove.

7. The optical fiber Bragg grating strain sensor holder for mining according to claim 6, characterized in that: The groove depth of the lower through groove (13) is no greater than half the width of the lower through groove (13).

8. The mining fiber Bragg grating strain sensor holder according to claim 7, characterized in that: The groove depth of the upper through groove (21) is no greater than half the width of the upper through groove (21).

9. The optical fiber Bragg grating strain sensor holder for mining according to claim 8, characterized in that: The inner wall of the wire clamping channel (3) is provided with an anti-slip structure.

10. The optical fiber Bragg grating strain sensor holder for mining according to claim 9, characterized in that: The anti-skid structure is at least one of an anti-skid groove, an anti-skid pattern or an anti-skid pad.

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