Temperature monitoring system and method for distributed optical fiber cable

Abstract

The invention discloses a temperature monitoring system and method for a distributed optical fiber cable. Relates to the technical field of temperature monitoring. The support and the traction steel wire are utilized to form the suspension system used for installing the electric tracing band, then the supporting frame A is installed on the traction steel wire, the inserting pipe A used for the electric tracing band to penetrate through and supporting the electric tracing band is arranged in the supporting frame A, and therefore the electric tracing band can be conveniently arranged and installed in the using process; the electric tracing band is prevented from being bent with the bending radius smaller than 10 diameters in the installation process; meanwhile, the two ends of the cannula A form an arc-shaped bending part which is used for supporting the electric tracing band, thereby preventing the electric tracing band from being separated from the end part of the cannula A, and preventing the electric tracing band from causing the bending of a temperature measurement optical fiber arranged in the electric tracing band with a bending radius smaller than 10 diameter due to the gravity of the electric tracing band. And the bending radius of the temperature measuring optical fiber extending out of the two ends of the intubation tube A is limited by using the arc-shaped bending parts formed at the two ends of the intubation tube A.

Description

Technical Field

[0001] This invention belongs to the field of temperature monitoring technology, and in particular relates to a temperature monitoring system and method for distributed optical fiber cables. Background Technology

[0002] When monitoring the temperature inside coal mine roadways or cable-type pipe corridors, fiber Bragg gratings are often used. Fiber Bragg grating technology has the advantage of being unaffected by electromagnetic interference and is commonly used for long-distance environmental monitoring, exhibiting good corrosion resistance and long-term stability. Therefore, fiber optic cables need to be laid during actual construction. However, light attenuation occurs during fiber optic transmission. Therefore, during fiber optic laying, care must be taken to protect the integrity of the fiber. Its bending radius should not be less than 10 times the fiber diameter to avoid damage from stretching, pressure, and bending. When the bending radius is less than 10 times the fiber diameter, significant macro-bending loss will occur, and the fiber may even burn out due to light energy accumulation at the bend.

[0003] In existing technologies, when laying cables along the length of a coal mine roadway, optical fiber cables are fixed to the roadway wall, and connectors and other components connecting the optical fiber cables are also fixed to the roadway wall, mainly using methods such as adhesive bonding or welding. However, since the roadway wall is often uneven, the bending radius of the optical fiber in some areas is easily less than 10 times the diameter of the optical fiber during actual installation. When laying optical fibers inside cable-type pipe racks, the optical fibers are often fixed to the cables laid inside the cable-type pipe rack using binding and fixing devices such as cable ties. This method also easily results in the bending radius of the optical fiber in some areas being less than 10 times the diameter of the optical fiber during actual installation. Summary of the Invention

[0004] The purpose of this invention is to provide a temperature monitoring system for distributed optical fiber cables. This system utilizes a bracket and a traction steel wire to form a suspension system for installing electric heating cables. A support frame A is then installed on the traction steel wire. The support frame A contains a conduit A for the electric heating cable to pass through and for supporting the electric heating cable. This invention solves the problems raised in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a distributed fiber optic cable temperature monitoring system, comprising an electric heating cable and a temperature detector connected thereto. The electric heating cable structure consists of a metal conductor, a semiconductor, an insulation layer, a braided layer, and an outer sheath arranged sequentially from the inside out. A temperature-sensing optical fiber is disposed between the insulation layer and the braided layer. The electric heating cable is arranged along a linear path via several installation mechanisms. Each installation mechanism includes a bracket, a traction steel wire connecting two adjacent brackets, and at least one support frame A for supporting the electric heating cable is installed on the traction steel wire located between two adjacent brackets. The support frame A includes a first connecting part A connected to the traction steel wire, a second connecting part A connected to the first connecting part A, and a support tube A connected to the ends of the two second connecting parts A. An insertion tube A is installed inside the support tube A. During installation, the electric heating cable is controlled to pass through the insertion tube A, and the two ends of the insertion tube A form arc-shaped bends to support the electric heating cable.

[0006] Furthermore, the first connecting part A includes two symmetrically arranged arc-shaped clamps, each with a mounting flange A on both sides. The mounting flange A has a guide post and guide hole that cooperate with each other, as well as an interference fit insertion hole and insertion post. The flange A has a notch. The outer peripheral sidewall of the insertion post has a protruding ring.

[0007] Furthermore, the second connecting part A is installed in conjunction with a connecting clamp A and a clamp B, which are fitted together and installed at the notch. Connecting blocks A are respectively provided at both ends of clamp A, and connecting blocks B are respectively provided at both ends of clamp B. A stud is provided on one side of connecting block A, penetrating the connecting block B, and a nut is threaded onto the stud. One end of connecting block A is connected to a hanger rod A, and the other end of connecting block B is connected to a hanger rod B. A connecting block C is provided on the outer wall of the support tube A, connected to the end of the hanger rod A. A slot for inserting the hanger rod B is provided at the top of connecting block C, and a locking bolt A is provided on the outer wall of connecting block C to fix the hanger rod B inside the slot.

[0008] Furthermore, the bracket includes a mounting plate, and fixing structures for fixing the traction wire are welded and fixed at both ends of the mounting plate; the fixing structure includes an internally threaded cylinder, and an opening for the traction wire to pass through is provided on the side wall of the internally threaded cylinder, and a locking bolt B is threadedly connected to the internally threaded cylinder; the locking bolt B abuts against the traction wire passing through the opening.

[0009] Furthermore, the mounting plate includes integrally formed rectangular plates A, B, and C, structural reinforcing plate A, and structural reinforcing plate B; the rectangular plates A, B, and C are fitted together in a "Z" shape, the structural reinforcing plate A is connected between the rectangular plates B and C, and the structural reinforcing plate B is connected between the rectangular plates A and B; the internally threaded cylinder is welded to one side of the rectangular plate A, and the rectangular plate C has a mounting through hole.

[0010] Furthermore, a tensioning structure is provided on the mounting plate located between the two fixed structures, which is fixed to one end of the traction wire and tensions the traction wire located between the two supports; the tensioning structure includes a rotating column, which is rotatably installed in a mounting hole provided on the mounting plate; one end of the rotating column is provided with an I-shaped reel, the middle of the I-shaped reel is provided with a fixed blind hole for inserting the traction wire, the end of the I-shaped reel is provided with an operating block, the operating block is provided with a groove, the bottom side of the groove is provided with a threaded blind hole connected to the fixed blind hole, and the threaded blind hole is threadedly connected with a locking bolt C for fixing the traction wire inserted into the fixed blind hole.

[0011] Furthermore, a positioning pin hole is provided on the rotating column, and a positioning pin rod assembly that mates with the positioning pin hole is provided on the mounting plate located on one side of the rotating column; the positioning pin rod assembly includes a protrusion provided on the mounting plate, and a positioning pin rod that is movably connected to the protrusion and inserted into the positioning pin hole; the outer wall of the positioning pin rod is provided with an operating head A and an operating head B with lengths of L1 and L2 respectively, where L2 > L1; a rectangular limiting groove is provided on one side wall of the rectangular plate A along the length direction of the positioning pin rod; rotating the positioning pin rod controls the operating head B to insert into the rectangular limiting groove, at which time the operating head B slides along the length direction of the rectangular limiting groove.

[0012] Furthermore, a limiting plate is provided on one side of the rectangular limiting slot, and a guide slope is provided on the end of the limiting plate near the rectangular limiting slot.

[0013] Furthermore, an end plate is provided at the end of the rotating column, and an elastic telescopic member is provided on one side wall of the end plate located on the periphery of the rotating column. The elastic telescopic member includes an inner sleeve and an outer sleeve that are nested together, and a spring connected between the two. One end of the outer sleeve is provided with a spherical structure that abuts against the mounting plate.

[0014] Furthermore, the insertion tube A includes a tube body A disposed inside the support tube A, with rubber tubes A connected to both ends of the tube body A; a plurality of convex rings are provided along the length of the outer periphery of the tube body A, the outer diameter of the convex rings being approximately equal to the inner diameter of the support tube A; a fixing screw extending to the outer side of the support tube A is threaded onto the convex rings located at the end of the tube body A, the fixing screw passing through a limiting plate abutting against the end of the support tube A, and an arc-shaped plate that is clamped against the outer wall of the support tube A is connected to one side of the limiting plate.

[0015] A method for temperature monitoring of distributed optical fiber cables includes: Step 1: Based on the overall coordinates of the building facilities and the buried line of the electric heating cable, obtain the coordinates of the temperature measuring points on the temperature measuring fiber; control the distance between two adjacent temperature measuring points on the temperature measuring fiber to be less than one meter. Step 2: Set a one-to-one mapping between the acquired coordinates and the temperature values ​​measured at the temperature measurement points; Step 3: Calculate the temperature distribution information using the finite difference method based on the temperature values ​​measured at the temperature measurement points.

[0016] The present invention has the following beneficial effects: 1. This invention utilizes a bracket and a traction steel wire to form a suspension system for installing electric heating cables. A support frame A is then installed on the traction steel wire. The support frame A contains a tube A for the electric heating cable to pass through and for supporting the cable. This facilitates the arrangement and installation of the electric heating cable during use and prevents the cable from bending with a radius less than 10 times its diameter during installation. At the same time, the two ends of the tube A form arc-shaped bends to support the electric heating cable, preventing the cable from detaching from the ends of the tube A. This prevents the internal temperature-sensing optical fiber from bending with a radius less than 10 times its diameter due to its own gravity. Furthermore, the arc-shaped bends at both ends of the tube A limit the bending radius of the temperature-sensing optical fiber protruding from the ends of the tube A during use.

[0017] 2. The distributed fiber optic temperature measurement technology of this application can perform real-time temperature monitoring of multi-directional, long-distance cabling lines; it can use electric heating tape to calibrate the location of the test points, thereby obtaining the real-time temperature of each test point, thus reducing labor costs. The temperature measurement equipment demodulates and compensates the temperature data through software, improving the accuracy of long-distance temperature data.

[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the electric heating tape structure according to an embodiment of the present invention; Figure 2 Schematic diagram of the installation structure of the electric heat tracing cable in this embodiment of the invention Figure 1 ; Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle; Figure 4 for Figure 3 Enlarged view of a section at point C; Figure 5 This is a schematic diagram of the electric heating cable installation structure according to an embodiment of the present invention. Figure 2 ; Figure 6 for Figure 5 Enlarged view of a section at point B in the middle; Figure 7 This is a diagram showing the assembly state of the electric heating cable and support frame A of the present invention; Figure 8 for Figure 7 Enlarged view of a section at point E in the middle; Figure 9 for Figure 7 Enlarged view of a section at point F in the middle; Figure 10 for Figure 7 A sectional view; Figure 11 This is a schematic diagram of the electric heating cable installation structure according to an embodiment of the present invention. Figure 3 ; Figure 12 This is a diagram showing the assembly state of the electric heating tape and support frame B in an embodiment of the present invention. Figure 13 for Figure 12 A sectional view; Figure 14 for Figure 13 Enlarged view of a section at point D; Figure 15 This is a diagram showing the connection status of two electric heating cables according to an embodiment of the present invention; Figure 16 This is a schematic diagram of the arc-shaped clamping plate structure of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0023] Please see Figure 1-2 As shown in Figure 5, this invention is a distributed fiber optic cable temperature monitoring system. When detecting the temperature inside the space of similar building facilities such as coal mine roadways or cable-type pipe corridors, it is necessary to arrange an electric heating cable 4 inside the space and connect the electric heating cable 4 to a temperature detector. In order to facilitate the arrangement and installation of the electric heating cable 4, this invention uses an installation mechanism to arrange and install the electric heating cable 4 on the inner wall of the building facility space. During installation, the electric heating cable 4 is controlled to be arranged linearly. The electric heating cable 4 mentioned in this invention adopts a structure consisting of a metal conductor 44, a semiconductor 43, an insulation layer 42, a braided layer 41, and an outer sheath 40 arranged sequentially from the inside to the outside. A temperature measuring optical fiber 45 is arranged between the insulation layer 42 and the braided layer 41.

[0024] Of course, electric heating tape is just one type of cable that can be used. Temperature measurement can be performed by using the appropriate cable in different environments. The temperature measurement system can be adapted to different occasions depending on the type of cable.

[0025] A method for temperature monitoring of distributed optical fiber cables includes: Step 1: Based on the overall coordinates of the building facilities and the buried line of the electric heating cable 4, obtain the coordinates of the temperature measuring points on the temperature measuring fiber; control the distance between two adjacent temperature measuring points on the temperature measuring fiber to be less than one meter. Step 2: Set a one-to-one mapping between the acquired coordinates and the temperature values ​​measured at the temperature measurement points; Step 3: Calculate the temperature distribution information using the finite difference method based on the temperature values ​​measured at the temperature measurement points.

[0026] Temperature measurement equipment technical parameters: Measurement distance: 1-16km; Number of temperature measurement channels: 1, 2, 4, 6, 8, 10, 12, 16 channels; Single channel measurement time: minimum 1s; Sampling interval: 0.4m; Positioning accuracy: 1m; Operating system: Windows; Working time: 7*24h; Main unit power consumption: 50W.

[0027] Based on the above, the specific installation method of the electric heating cable 4 is as follows: First, lay the electric heating cable 4 along the buried line in the temperature measurement section. This section can be used in scenarios such as decks, pipelines, warehouses, inside coal mine roadways, or inside cable-type pipe corridors. After the electric heating cable 4 is laid, the temperature measuring fiber optic cable at the tail end is connected to an FC / APC connector that can be connected to the temperature measuring equipment.

[0028] In the above process, to facilitate the calibration of the temperature measuring points of the electric heating cable 4, the temperature measuring positions are calculated based on the meter markings of the laid electric heating cable 4, or the temperature measuring points are heated and their positions are calibrated based on the changes in the software curve. After connecting the electric heating cable 4 at the tail end to the temperature detector, start measuring the temperature. After the temperature measuring device is started, it emits laser pulses to the electric heating cable and converts (photoelectric conversion module), collects (data acquisition card), demodulates and compensates (distributed fiber optic temperature demodulation system) the reflected light signal. Finally, it outputs real-time temperature data to the display terminal, which includes, but is not limited to, various displays, smartphones, laptops, and tablets.

[0029] All measured temperature data will be stored. There are three ways to review historical data: displaying a list of temperatures at all points in all time periods, playing back curves at all points in a selected time period, and playing back the full time period at a selected temperature measurement point.

[0030] The aforementioned installation mechanism includes a bracket 1 installed on the inner wall of the building facility. A traction steel wire 2 is connected between two adjacent brackets 1. Two support frames A3 for supporting the electric heating cable 4 are installed on the traction steel wire 2 located between two adjacent brackets 1. The support frame A3 includes a first connecting part A connected to the traction steel wire 2, a second connecting part A connected to the first connecting part A, and a support pipe A34 connected to the ends of the two second connecting parts A. An insertion pipe A35 is installed inside the support pipe A34. During installation, the electric heating cable 4 is controlled to pass through the insertion pipe A35.

[0031] Based on the above requirements, in order to avoid using the insertion tube A35 to support the electric heating cable 4, under the action of the electric heating cable 4's own weight, when the electric heating cable 4 detaches from the end of the insertion tube A35, the electric heating cable 4 is prone to bending with a bending radius less than 10 of its diameter; in order to support the electric heating cable 4 and thus avoid bending with a bending radius less than 10 of its diameter after the end of the insertion tube A35 detaches from the electric heating cable 4, the insertion tube A35 provided by the present invention includes a tube body A350 disposed in the support tube A34, and the two ends of the tube body A350 are respectively connected to rubber tubes A351.

[0032] To facilitate the installation of pipe body A350 inside support pipe A34, such as Figure 10 A plurality of convex rings 352 are provided along the length of the outer periphery of the tube body A350, and the outer diameter of the convex rings 352 is approximately equal to the inner diameter of the support tube A34. A fixing screw 353 extending to the outer side of the support tube A34 is threaded onto the convex rings 352 located at the end of the tube body A350. The fixing screw 353 passes through a limiting plate 355 that abuts against the end of the support tube A34. An arc-shaped plate 354 that is engaged with the outer wall of the support tube A34 is connected to one side of the limiting plate 355. Therefore, by utilizing the convex rings 352, fixing screws 353, arc-shaped plate 354, and limiting plate 355, the insertion tube A35 is easily controlled during use. Figure 7-8 As shown in Figure 10, it is installed inside the support tube A34.

[0033] In use, to facilitate the installation of the first connecting part A onto the traction steel wire 2, in one possible embodiment, such as... Figure 9 The first connecting part A provided includes two symmetrically arranged arc-shaped clamps 30, such as... Figure 16 Both sides of the arc-shaped clamping plate 30 are provided with mounting flanges A31. The mounting flanges A31 are provided with mutually cooperating guide posts 311 and guide holes 312, as well as interference fit insertion holes 313 and insertion posts 314. Notches 310 are provided at both ends of the flanges A31. The outer peripheral sidewall of the insertion post 314 is provided with a protruding ring 315. In the above configuration, the cooperation of the guide posts 311 and guide holes 312 facilitates the alignment of the two arc-shaped clamping plates 30. After the two arc-shaped clamping plates 30 are aligned, the two arc-shaped clamping plates 30 are brought closer together by force, thereby controlling the insertion post 314 to be inserted into the insertion hole 313, and then connecting the two arc-shaped clamping plates 30 together and clamping them on the traction steel wire 2. In order to facilitate clamping on the traction steel wire 2, a rubber elastic layer is provided on the inner wall of the arc-shaped clamping plate 30.

[0034] Based on the above, in this embodiment, such as Figure 7-9The provided second connecting part A is installed on a clamping clamp A32 and a clamping clamp B33, which are fitted together and installed at the notch 310. Connecting blocks A321 are respectively provided at both ends of clamp A32, and connecting blocks B331 are respectively provided at both ends of clamp B33. A stud 322 is provided on one side of connecting block A321, which passes through connecting block B331 and is threaded with a nut 332. A rod A323 is connected to the end of one connecting block A321 and a rod B333 is connected to the end of one connecting block B331. A connecting block C341 is provided on the outer side wall of the support tube A34, which is connected to the end of the rod A323. A slot 342 for inserting the rod B333 is provided at the top of connecting block C341, and a locking bolt A343 is provided on the outer side wall of connecting block C341 to fix the rod B333 in the slot 342.

[0035] In use, to facilitate the installation of bracket 1 on the inner wall of the building facility, in one possible implementation, such as... Figure 3 The bracket 1 provided by the present invention includes a mounting plate 10, and the two ends of the mounting plate 10 are respectively welded and fixed with fixing structures for fixing the traction steel wire 2. Thus, during installation, the two ends of the traction steel wire 2 are respectively connected to the fixing structures on the two brackets 1. The specific fixing structure includes an internal threaded cylinder 11, and the side wall of the internal threaded cylinder 11 is provided with an opening 111 for the traction steel wire 2 to pass through. A locking bolt B112 is threadedly connected to the internal threaded cylinder 11. The locking bolt B112 abuts against the traction steel wire 2 that passes through the opening 111.

[0036] Based on the above, in order to facilitate the installation of the mounting plate 10, the mounting plate 10 provided by the present invention includes an integrally formed rectangular plate A101, rectangular plate B102, rectangular plate C103, structural reinforcing plate A105, and structural reinforcing plate B107; the rectangular plates A101, B102, and C103 are fitted together in a "Z" shape, the structural reinforcing plate A105 is connected between the rectangular plates B102 and C103, and the structural reinforcing plate B107 is connected between the rectangular plates A101 and B102; the internally threaded cylinder 11 is welded to one side of the rectangular plate A101, and the rectangular plate C103 is provided with a mounting through hole 104. In use, the mounting plate 10 is installed on the inner wall of the building facility by means of expansion screws passing through the mounting through hole 104.

[0037] It is known that when the traction wire 2 is fixed using the above-mentioned fixed structure, the length of the traction wire 2 located between the two supports 1 is generally greater than the distance between the two supports 1 during actual installation. Therefore, it is necessary to tension the traction wire 2 located between the two supports 1 during actual installation. Two tensioning structures are set on the rectangular plate A101 located between the two fixed structures. The two tensioning structures are respectively connected to the traction wire 2 fixed on the two fixed structures. Then, during use, the two traction wires 2 located on both sides of the support 1 are tensioned.

[0038] The tensioning structure provided by the present invention includes a rotating column 12, which is rotatably installed in a mounting hole 106 provided on a mounting plate 10. One end of the rotating column 12 is provided with an I-shaped reel 121, and the middle of the I-shaped reel 121 is provided with a fixed blind hole for inserting the traction wire 2. The end of the I-shaped reel 121 is provided with an operating block 122, and the operating block 122 is provided with a groove 123. The bottom side of the groove 123 is provided with a threaded blind hole connected to the fixed blind hole, and a locking bolt C124 is threadedly connected to the threaded blind hole to fix the traction wire 2 inserted into the fixed blind hole. Therefore, when it is necessary to tension the traction wire 2, the traction wire 2 is first controlled to be inserted into the fixed blind hole, and then the locking bolt C124 is rotated to fix the traction wire 2 inserted into the fixed blind hole. The rotating column 12 is controlled to be rotated by using a socket wrench on the hexagonal column-shaped operating block 122, and the traction wire 2 is controlled to be tensioned.

[0039] In order to fix the rotating column 12 after rotation and prevent the rotating column 12 from rotating abnormally, a positioning pin hole is provided on the rotating column 12, and a positioning pin rod assembly 13 that cooperates with the positioning pin hole is provided on the mounting plate 10 located on one side of the rotating column 12.

[0040] Based on the above settings, such as Figure 4 The positioning pin assembly 13 provided by the present invention includes a protrusion 130 disposed on a mounting plate 10, a positioning pin 131 movably connected to the protrusion 130 and inserted into a positioning pin hole, and an operating head A132 and an operating head B133 with lengths of 1cm and 0.5cm respectively disposed on the outer wall of the positioning pin 131. A rectangular limiting groove 108 is disposed on one side wall of the rectangular plate A101 along the length direction of the positioning pin 131. When the positioning pin 131 is rotated, the operating head B133 is controlled to insert into the rectangular limiting groove 108. At this time, the operating head B133 slides along the length direction of the rectangular limiting groove 108. When the operating head A132 is rotated to a position where its length direction is perpendicular to the rectangular plate B102, the bottom side of the operating head A132 abuts against the upper surface of the rectangular plate B102, thereby preventing the positioning pin 131 from being inserted into the positioning pin hole under its own weight.

[0041] During the rotation of the control positioning pin 131, in order to facilitate the limitation of the rotation angle of the positioning pin 131, a limiting plate 109 is provided on one side of the port of the rectangular limiting slot 108. A guide slope 110 is provided on the end of the limiting plate 109 near the rectangular limiting slot 108. Thus, when the control positioning pin 131 rotates, it rotates to the side of the operating head A132 and the operating head B133 and abuts against the limiting plate 109.

[0042] In order to facilitate the control of the rotation of the rotating column 12 during use, such as Figure 6 An end plate 125 is provided at the end of the rotating column 12. An elastic telescopic member 126 is provided on one side wall of the end plate 125 located around the rotating column 12. The elastic telescopic member 126 includes an inner sleeve and an outer sleeve that are sleeved together, and a spring connected between the two. One end of the outer sleeve is provided with a spherical structure that abuts against the mounting plate 10.

[0043] Based on the above installation and arrangement of the electric heating cable 4, in actual operation, as the length of coal mine roadways or cable-type pipe corridors increases, it is necessary to connect multiple electric heating cables 4 in practical use, such as... Figure 15 In actual operation, the high temperature of a fusion splicer is used to melt and connect the end faces of the temperature-sensing optical fibers 45 inside the two electric heating cables 4. Simultaneously, a protective sleeve 46 is fitted and fixed at the connection point of the two temperature-sensing optical fibers 45 to prevent bending of the protective sleeve 46 during use, which could cause breakage at the connection point of the two temperature-sensing optical fibers 45. Figure 11 The present invention has a support frame B fixed on the traction steel wire 2 to support the connection part of the two temperature measuring optical fibers 45, that is, the support frame B supports the connection part of the two electric heating cables 4 at the same time.

[0044] Specifically, such as Figure 12-13 The support frame B includes a first connecting part B50 connected to the traction steel wire 2, a second connecting part B51 connected to the first connecting part B50, and a support tube B52 connected to the ends of the two second connecting parts B51. An insert tube B is inserted through the support tube B52. The first connecting part B50 has the same structure as the first connecting part A, the second connecting part B51 has the same structure as the second connecting part A, and the support tube B52 has the same structure as the support tube A34. In use, the electric heating tape 4 is controlled to pass through the insert tube B, and the connection parts of the two electric heating tapes 4 and the protective sleeve 46 are all inside the support tube B52.

[0045] Of course, in order to prevent the electric heating cable 4 from sliding along the inside of the insertion tube B due to gravity during use, that is, it is necessary to limit the movement of the protective sleeve 46 inside the insertion tube B during use, so as to prevent one end of the protective sleeve 46 from protruding from one end of the support tube B52. Therefore, in this invention, extension tubes 53 are connected to both ends of the support tube B52 respectively. The end of the extension tube 53 is provided with a fixing sleeve 531 that is sleeved on the outer wall of the support tube B52. The fixing sleeve 531 is connected with a locking bolt D342.

[0046] Meanwhile, the insertion tube B provided in this feasible technical solution includes a rigid tube 57 located inside the support tube B52 and with a length shorter than that of the support tube B52. Both ends of the rigid tube 57 are connected to rubber tubes B54 via connecting tubes 561.

[0047] Specifically, such as Figure 14 The rubber tube B54 has a flanged connector 541 at one end. Positioning protrusions A542 and B543 are respectively provided at both ends of the flanged connector 541. During installation, a pad 55 is fitted onto the outside of the rubber tube B54. The two sides of the pad 55 are respectively aligned with the flanged connector 541 and the end face of the extension tube 53. Simultaneously, one side of the pad 55 has a positioning groove A552 that mates with the positioning protrusion A542, and the other side of the pad 55 has a positioning protrusion C551. The end face of the extension tube 53 is provided with… There is a positioning groove C533 that mates with the positioning protrusion C551; a mounting protrusion 56 is provided on the outer periphery of the middle position of the connecting pipe 561, and a positioning groove B563 that mates with the positioning protrusion B543 is provided on one side of the mounting protrusion 56. A positioning slot is provided on the outer wall of the mounting protrusion 56, and a positioning insert 521 that is inserted into the positioning slot is provided on the inner wall of the end of the support pipe B52. In use, under the influence of the electric heating tape 4 and the gravity of the rubber tube B54, the rubber tube B54 will bend to a certain degree.

[0048] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A temperature monitoring system for a distributed optical fiber cable, characterized in that: It includes an electric heating tape (4) and a temperature detector connected thereto; The electric heating tape (4) has a structure that includes a metal conductor (44), a semiconductor (43), an insulating layer (42), a braided layer (41), and an outer sheath (40) arranged in sequence from the inside to the outside; and a temperature measuring optical fiber (45) is arranged between the insulating layer (42) and the braided layer (41); The electric heating tape (4) is arranged along a linear path by means of a plurality of installation mechanisms; The installation mechanism comprises a bracket (1), a traction wire (2) connected between two adjacent brackets (1), and at least one support frame A (3) for supporting the electric heating tape (4) is installed on the traction wire (2) located between the two adjacent brackets (1); The support frame A (3) comprises a first connection part A connected to the traction wire (2), a second connection part A connected to the first connection part A, and a support tube A (34) connected to the two ends of the second connection part A, wherein an insertion tube A (35) is installed in the support tube A (34); During installation, the electric heating tape (4) is controlled to pass through the insertion pipe A (35); arc-shaped curved portions are formed at both ends of the insertion pipe A (35) for supporting the electric heating tape (4).

2. A distributed optical fiber cable temperature monitoring system according to claim 1, characterized in that: The first connection portion A comprises two symmetrically arranged arc-shaped clamping plates (30) arranged opposite to each other, and mounting flanges A (31) are arranged along both sides of the arc-shaped clamping plates (30). The mounting flanges A (31) are provided with mutually matching guide columns (311) and guide holes (312), as well as interference-fitting plug holes (313) and plug columns (314); notches (310) are respectively arranged at both ends of the flanges A (31); A convex ring (315) is provided on the outer peripheral side wall of the plug post (314).

3. A distributed optical fiber cable temperature monitoring system according to claim 2, characterized in that: The second connection portion A is installed on a matching connection clamp A (32) and a clamp B (33), the clamp A (32) and the clamp B (33) are surrounded and matched with each other at the notch (310), the two ends of the clamp A (32) are respectively provided with connection blocks A (321), and the two ends of the clamp B (33) are respectively provided with connection blocks B (331); a stud (322) penetrating the connection block B (331) is provided on one side of the connection block A (321), and a nut (332) is threadedly connected to the stud (322); An end of the connection block A (321) is connected to the suspension rod A (323), and an end of the connection block B (331) is connected to the suspension rod B (333); The outer wall of the support tube A (34) is provided with a connection block C (341) connected to the end of the suspension rod A (323); the top of the connection block C (341) is provided with a slot (342) for inserting the suspension rod B (333); the outer wall of the connection block C (341) is provided with a locking bolt A (343) for fixing the suspension rod B (333) inserted into the slot (342).

4. A distributed optical fiber cable temperature monitoring system according to any one of claims 1 to 3, characterized in that: The bracket (1) comprises a mounting plate (10), and fixing structures for fixing the traction wire (2) are respectively welded and fixed at both ends of the mounting plate (10); The fixing structure comprises an internally threaded barrel (11), a side wall of the internally threaded barrel (11) is provided with an opening (111) for the traction wire (2) to pass through, and a locking bolt B (112) is threadedly connected to the internally threaded barrel (11); The locking bolt B (112) abuts against the traction wire (2) passing through the opening (111).

5. A distributed optical fiber cable temperature monitoring system according to claim 4, characterized in that: The mounting plate (10) comprises an integrally formed rectangular plate A (101), a rectangular plate B (102), a rectangular plate C (103), a structural reinforcement plate A (105) and a structural reinforcement plate B (107); The rectangular plate A (101), the rectangular plate B (102), and the rectangular plate C (103) cooperate to form a "Z" shape, the structural reinforcement plate A (105) is connected between the rectangular plate B (102) and the rectangular plate C (103), and the structural reinforcement plate B (107) is connected between the rectangular plate A (101) and the rectangular plate B (102); The internal threaded cylinder (11) is welded to one side of the rectangular plate A (101), and a mounting through hole (104) is provided on the rectangular plate C (103).

6. A distributed optical fiber cable temperature monitoring system according to claim 5, characterized in that: A tensioning structure is provided on the mounting plate (10) located between the two fixing structures, the tensioning structure being fixed to one end of the traction steel wire (2) and tensioning the traction steel wire (2) located between the two brackets (1); The tensioning structure comprises a rotating column (12), wherein the rotating column (12) is rotatably mounted in a mounting hole (106) provided on the mounting plate (10); An I-shaped reel (121) is provided at one end of the rotating column (12), a fixed blind hole for inserting a traction wire (2) is provided in the middle of the I-shaped reel (121), an operating block (122) is provided at the end of the I-shaped reel (121), a groove (123) is provided on the operating block (122), a threaded blind hole connected to the fixed blind hole is provided on the bottom side of the groove (123), and a locking bolt C (124) is threadedly connected to the threaded blind hole for fixing the traction wire (2) inserted into the fixed blind hole.

7. A distributed optical fiber cable temperature monitoring system according to claim 6, characterized in that: A positioning pin hole is provided on the rotating column (12), and a positioning pin rod assembly (13) cooperating with the positioning pin hole is provided on the mounting plate (10) located on one side of the rotating column (12); The positioning pin rod assembly (13) comprises a protrusion (130) arranged on the mounting plate (10), a positioning pin rod (131) movably connected to the protrusion (130) and inserted into the positioning pin hole, and an operating head A (132) and an operating head B (133) having lengths L1 and L2 respectively are arranged on the outer side wall of the positioning pin rod (131), wherein L2>L1; A rectangular limiting notch (108) is provided on one side wall of the rectangular plate A (101) along the length direction of the positioning pin rod (131); The positioning pin rod (131) is rotated to control the operating head B (133) to be inserted into the rectangular limiting slot (108), and the operating head B (133) slides along the length direction of the rectangular limiting slot (108); a limiting plate (109) is provided on one side of the end of the rectangular limiting slot (108), and a guiding inclined surface (110) is provided on the end of the limiting plate (109) close to the side of the rectangular limiting slot (108).

8. A distributed optical fiber cable temperature monitoring system according to any one of claims 5 to 7, characterized in that: An end plate (125) is provided at the end of the rotating column (12); a side wall of the end plate (125) located on the peripheral side of the rotating column (12) is provided with an elastic telescopic member (126); the elastic telescopic member (126) comprises an inner sleeve and an outer sleeve which are sleeved together, and a spring connected therebetween; one end of the outer sleeve is provided with a spherical structure which abuts against the mounting plate (10).

9. A distributed optical fiber cable temperature monitoring system according to claim 1, characterized in that: The insert tube A (35) comprises a tube body A (350) arranged in the support tube A (34), and both ends of the tube body A (350) are respectively connected to the rubber tube A (351); A plurality of convex ring bodies (352) are arranged on the outer peripheral side of the tube body A (350) along its length direction, and the outer diameter of the convex ring body (352) is equivalent to the inner diameter of the support tube A (34); A fixing screw (353) extending to the outer side of the support tube A (34) is threadedly connected to the convex ring body (352) at the end of the tube body A (350); The fixing screw (353) passes through a limiting plate (355) abutting against the end of the support tube A (34); one side of the limiting plate (355) is connected to an arc-shaped plate (354) clamped on the outer wall of the support tube A (34).

10. A temperature monitoring method for a distributed optical fiber cable, characterized in that: It adopts a temperature monitoring system for a distributed optical fiber cable according to claim 1; the temperature monitoring method comprises: Step 1: According to the overall coordinates of the building facilities and the buried line of the electric heating cable (4), the coordinates of the temperature measuring points of the temperature measuring optical fiber are obtained; and the distance between two adjacent temperature measuring points on the temperature measuring optical fiber is controlled to be less than one meter; Step 2: mapping the acquired coordinates to the temperature values ​​measured at the temperature measuring points in a one-to-one manner; Step 3: Calculate the temperature distribution information using the finite difference method according to the temperature values ​​measured at the temperature measuring points.

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