An active health detection device and method for in-service building cables

Abstract

The present invention relates to the technical field of building structure detection, and specifically to an active detection device and method for the health of in-service building cables, comprising a first driving part and a second driving part of the same structure, as well as a detection component, a cable fixing seat and an actuating component. The actuating component is fixedly installed on the in-service building cable through the cable fixing seat. The actuating component can generate vibrations of various waveforms, which are applied to the building cable through the cable fixing seat. The actuating component vibrates the building cable, and can actively detect the health of the in-service building cable. By controlling the driving part on the detection component to move to the position to be detected, the health status of the building cable is judged by detecting the vibration transmitted in the building cable.

Description

Technical Field

[0001] The present invention relates to the technical field of building structure detection, and in particular to a device and method for actively detecting the health of cables in service. Background Art

[0002] Steel cables, stays, and other long structural structures are widely used in large buildings and bridges. The vibration and swing of cables caused by natural factors such as wind and human factors such as the excitation / resonance of heavy vehicles are important for assessing their health. Two-dimensional swing occurs perpendicular to the length direction. The most important way to monitor cable swing is an acceleration measurement device, including high-precision fiber optic accelerometers, auxiliary equipment, and algorithms. Based on the principles of fiber Bragg gratings, fiber scattering, Fabry-Perot interferometry, and other principles, acceleration measurement is achieved in conjunction with a mass block.

[0003] However, existing detection devices are usually passive detection devices that require continuous monitoring of the vibration status of the building structure. Therefore, the amount of data obtained is large and noisy, and the workload of data processing is large, which also reduces the accuracy of the calculation results. The existing technology has not yet stimulated the building structure through active vibration excitation to specifically detect the health status of the building structure. Summary of the Invention

[0004] Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a device and method for actively detecting the health of in-service building cables. By generating vibrations on the building cables through an actuating component, the health of the in-service building cables can be actively detected. By controlling the driving part on the detection component to move to the position to be detected, the health status of the building cables can be judged by detecting the vibrations transmitted in the building cables.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: an active health detection device for in-service building cables, comprising a first drive unit and a second drive unit of identical structure, a detection assembly, a cable fixing base, and an actuating assembly. The actuating assembly is fixedly mounted to the in-service building cable via the cable fixing base. The actuating assembly is capable of generating vibrations of various waveforms, which are applied to the building cable via the cable fixing base.

[0008] The detection assembly is provided with a first driving part and a second driving part at both ends. The first driving part and the second driving part are detachably mounted on the same building cable, and the detection assembly is moved to a position to be detected on the building cable by the first driving part and the second driving part.

[0009] After the detection component reaches the position to be detected, the photoelectric detection component is pressed against the surface of the building cable through the telescopic component;

[0010] The demodulation module of the detection component emits broad-spectrum light into the photoelectric detection component, and demodulates various reflection parameters of the broad-spectrum light after passing through the photoelectric detection component.

[0011] Furthermore, the detection assembly includes a support beam, a linear drive unit, a movable substrate, an elastic support assembly, a photoelectric detection assembly and a communication unit;

[0012] The photoelectric detection component includes a communication connection part, a detection grating and an optical fiber;

[0013] The two ends of the support beam are respectively connected to the first drive part and the second drive part. The support beam is an approximately C-shaped structure. A plurality of linear drive parts are provided on the side of the support beam facing the building cable. A movable base plate is provided on the movable end of the linear drive part. A plurality of elastic support components are provided on the movable base plate. A communication connection part is provided on the common support of the plurality of elastic support components.

[0014] A plurality of detection gratings are provided on the communication connection portion via an elastic fixing structure, and optical fibers are provided on the plurality of detection gratings;

[0015] The communication part is arranged on the supporting beam, and the communication part is electrically connected to the communication connection part, the detection grating and the optical fiber.

[0016] Furthermore, the detection grating and optical fiber are close to the building cable and can twist along with the vibration of the building cable;

[0017] The detection grating is a Bragg grating with the same parameters, and the optical fiber is a bare optical fiber;

[0018] The vibration generated by the actuating assembly is transmitted through the building cable, causing the detection grating and the optical fiber to twist. The wide spectrum emitted by the demodulation module enters the optical fiber on the detection grating and is refracted. The refracted spectrum parameters are obtained by the demodulation module, and then the swing deformation of the building cable is determined based on the detected spectrum parameters, thereby judging the health status of the building cable.

[0019] Furthermore, the first driving portion and the second driving portion have the same structure and both include an upper support portion, a lower support portion, a folding arm assembly and a hinge seat;

[0020] Both sides of the upper support portion are connected to the folding arm assembly via a hinge seat, and the other end of the folding arm assembly is connected to the lower support portion via a hinge seat;

[0021] The folding arm assembly includes a first articulated arm, a second articulated arm, an adjusting screw rod, and a nut seat;

[0022] The first articulated arm and the second articulated arm are rotatably connected by a hinge hinge;

[0023] Nut seats are respectively arranged at the middle parts of the first articulated arm and the second articulated arm through a rotating shaft, and the adjusting screw rod is threadedly connected to the two nut seats;

[0024] The hinge seat is connected to the upper support part and the lower support part through a detachable fixing member, so that the upper support part and the lower support part are sleeved on the end face of the building cable through two folding arm assemblies;

[0025] By rotating the adjusting screw rod to change the folding angle between the first articulated arm and the second articulated arm, the upper support part and the lower support part are further pressed against both sides of the building cable.

[0026] Further, the upper support part includes an upper support frame, a crawler support, a driving roller, a driving crawler, and a crawler motor;

[0027] The lower support part includes a lower support frame, a roller support, a first support roller, and a second support roller;

[0028] The cross section of the upper support frame is a C-shaped structure. The two sides of the upper support frame are connected to two first articulated arms through hinge seats. A crawler support is fixedly connected in the inner cavity of the upper support frame. Driving rollers are arranged at both ends of the crawler support. A driving crawler is sleeved on the driving rollers, and the crawler motor is in transmission connection with the driving rollers to drive the driving crawler to rotate;

[0029] The cross section of the lower support frame is a C-shaped structure. The two sides of the lower support frame are connected to two second articulated arms through hinge seats. A roller support is fixedly connected in the inner cavity of the lower support frame. A first support roller and a second support roller are rotatably arranged at both ends of the roller support.

[0030] Further, the circumferential wheel surfaces of the first support roller and the second support roller are formed into concave arc surfaces, so as to be able to fit the building cable.

[0031] Further, the cable fixing seat includes a lower hoop, an upper hoop, and a connecting bolt;

[0032] The actuating component includes an eccentric component, an actuating motor, a rotating shaft, and a support bearing;

[0033] The lower hoop and the upper hoop are fixedly connected through a connecting bolt to enclose and fix on the building cable;

[0034] A plurality of cable fixing seats are fixed on the building cable, and the lower portion of the actuating motor is fixedly connected to the building cable via two cable fixing seats;

[0035] The rotating shaft of the actuating motor extends out from both ends of the actuating motor. Eccentric components are respectively fixed on the rotating shafts on both sides of the actuating motor. The outermost ends of the rotating shafts are rotatably connected to the cable fixing seats through support bearings, and the two ends of the rotating shaft are supported on the building cable through the cable fixing seats.

[0036] Furthermore, the eccentric assembly includes a disc base, a mass block, and a fixed assembly;

[0037] The disc base is fixed to the rotating shaft via a keyway. The disc base is equally divided into four phases in the circumferential direction. A mounting position of a fixing assembly is provided at each phase position. The mass block is mounted in the corresponding phase of the disc base via the fixing assembly.

[0038] The mass block is installed in a single phase / in two adjacent phases / in three adjacent phases of the disc base, so that the mass center of the eccentric component deviates from the rotation center of the eccentric component.

[0039] Furthermore, the positions of the phases of the masses on the two disc bases are the same or different, thereby generating vibrations of different forms.

[0040] A method for actively detecting the health of cables in service, using the above detection device, includes the following steps:

[0041] Step a, installing and fixing the actuating assembly to a conveniently operable position of an in-service building cable through a cable fixing seat;

[0042] Step b, installing the first driving part and the second driving part of the detection assembly on the same building cable;

[0043] Step c, controlling the linear drive unit to an initial contracted state, and applying bonding agent on the sides of the detection grating and the optical fiber facing the building cable;

[0044] Step d: starting the crawler motor to move the detection assembly to the position of the building cable to be detected, and controlling the linear drive unit to press the detection grating and the optical fiber tightly against the surface of the building cable;

[0045] In step e, a specific number of mass blocks are installed on the disc base, and the actuator motor is started to rotate the eccentric component while generating a fixed frequency vibration. The vibration is transmitted through the building cable and received by the detection component to detect the health status of the building cable.

[0046] Beneficial effects

[0047] Compared with the existing technology, the present invention provides an active health detection device and method for in-service building cables, which has the following beneficial effects:

[0048] 1. The actuating assembly of the present invention can generate vibration excitation for the building cable. The vibration is transmitted through the building cable and received by the detection assembly. After calculation, the health status of the building cable can be determined. Through active detection, the data processing method can be simplified, thereby improving the accuracy of the calculation.

[0049] 2. The actuating assembly of the present invention can be installed at a convenient installation position of the building cable, and the detection assembly can be installed at an accessible position on the building cable. The detection assembly is moved to the position to be detected on the building cable by the first and second drive parts, and the optical fiber and grating used for detection are pressed tightly against the surface of the building cable by controlling the linear drive part.

[0050] 3. The eccentric assembly of the present invention can generate different forms of vibration by adjusting the different installation positions of the mass blocks. When the mass blocks on the two disc bases are distributed in the same phase, the disc bases can generate an upward eccentric force or a downward eccentric force at the same time when they rotate; when the mass blocks on the two disc bases are distributed in different phases, one of the disc bases can generate an upward eccentric force when it rotates, and the other disc base can generate a downward eccentric force when it rotates, thereby generating vibrations of different frequencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a structural schematic diagram of the building cable health detection device of the present invention;

[0052] Figure 2 It is a structural schematic diagram of the driving part of the present invention;

[0053] Figure 3 It is a structural schematic diagram of the upper support portion of the present invention;

[0054] Figure 4 It is a structural schematic diagram of the lower support portion of the present invention;

[0055] Figure 5 Schematic diagram of the structure of the detection component of the present invention;

[0056] Figure 6 Schematic diagram of the structure of the actuating portion of the active detection device of the present invention;

[0057] Figure 7 is a schematic structural diagram of the actuating assembly of the present invention;

[0058] Figure 8 It is a structural schematic diagram of the eccentric assembly of the present invention;

[0059] In the picture:

[0060] First driving part 1, upper supporting part 11, upper supporting frame 111, track support 112, transmission roller 113, transmission track 114, track motor 115, lower supporting part 12, lower supporting frame 121, roller support 122, first supporting roller 123, second supporting roller 124, first articulated arm 13, second articulated arm 14, adjusting screw 15, nut seat 16, articulated seat 17, detachable fixing member 18, articulated joint 19;

[0061] A second driving unit 2;

[0062] Detection component 3, support beam 31, linear drive unit 32, movable substrate 33, elastic support component 34, communication connection unit 35, detection grating 36, optical fiber 37, communication unit 38;

[0063] Building cable 4;

[0064] Cable fixing seat 5, lower clamp 51, upper clamp 52, connecting bolt 53;

[0065] Actuating assembly 6, eccentric assembly 61, disc base 611, mass block 612, fixing assembly 613, actuating motor 62, rotating shaft 63, supporting bearing 64; DETAILED DESCRIPTION

[0066] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0067] The following is based on the attached Figure 1-8 The present invention is described in detail. An active health detection device and method for in-service building cables of the present invention comprises a first driving unit 1 and a second driving unit 2 of identical structure, as well as a detection assembly 3, a cable fixing seat 5 and an actuating assembly 6. The actuating assembly 6 is fixedly mounted on the in-service building cable 4 via the cable fixing seat 5. The actuating assembly 6 is capable of generating vibrations of various waveforms, which are applied to the building cable 4 via the cable fixing seat 5.

[0068] The detection component 3 is provided with a first driving part 1 and a second driving part 2 at both ends. The first driving part 1 and the second driving part 2 are detachably mounted on the same building cable 4. The detection component 3 is moved to a position to be detected on the building cable 4 by the first driving part 1 and the second driving part 2.

[0069] After the detection component 3 reaches the position to be detected, the photoelectric detection component is pressed against the surface of the building cable 4 through the telescopic component;

[0070] The demodulation module of the detection component 3 emits broad spectrum light into the photoelectric detection component, and demodulates various reflection parameters of the broad spectrum light after passing through the photoelectric detection component.

[0071] Furthermore, the detection assembly 3 includes a support beam 31, a linear drive unit 32, a movable substrate 33, an elastic support assembly 34, a photoelectric detection assembly and a communication unit 38;

[0072] The photoelectric detection assembly includes a communication connection portion 35, a detection grating 36 and an optical fiber 37;

[0073] The two ends of the support beam 31 are respectively connected to the first drive unit 1 and the second drive unit 2. The support beam 31 is an approximately C-shaped structure. A plurality of linear drive units 32 are provided on the side of the support beam 31 facing the building cable 4. A movable base plate 33 is provided on the movable end of the linear drive unit 32. A plurality of elastic support components 34 are provided on the movable base plate 33. A communication connection unit 35 is provided on the common support of the plurality of elastic support components 34.

[0074] The communication connection portion 35 is provided with a plurality of detection gratings 36 via an elastic fixing structure, and the plurality of detection gratings 36 are provided with optical fibers 37;

[0075] The communication portion 38 is disposed on the support beam 31 , and is electrically connected to the communication connection portion 35 , the detection grating 36 , and the optical fiber 37 .

[0076] Furthermore, the detection grating 36 and the optical fiber 37 are close to the building cable 4 and can twist along with the vibration of the building cable 4;

[0077] The detection grating 36 is a Bragg grating with the same parameters, and the optical fiber 37 is a bare optical fiber;

[0078] The vibration generated by the actuating assembly 6 is transmitted through the building cable 4, causing the detection grating 36 and the optical fiber 37 to twist. The wide spectrum emitted by the demodulation module enters the optical fiber 37 on the detection grating 36 and is refracted. The refracted spectrum parameters are obtained by the demodulation module, and then the swing deformation of the building cable 4 is determined based on the detected spectrum parameters, thereby judging the health status of the building cable 4.

[0079] Furthermore, the first driving part 1 and the second driving part 2 have the same structure and both include an upper support part 11, a lower support part 12, a folding arm assembly and a hinge seat 17;

[0080] On both sides of the upper support part 11, the folding arm assemblies are respectively connected through hinge seats 17, and the other ends of the folding arm assemblies are respectively connected to the lower support part 12 through hinge seats 17;

[0081] The folding arm assembly includes a first hinge arm 13, a second hinge arm 14, an adjusting screw 15 and a nut seat 16;

[0082] Between the first hinge arm 13 and the second hinge arm 14, they are rotatably connected through a hinge hinge 19;

[0083] At the middle parts of the first hinge arm 13 and the second hinge arm 14, nut seats 16 are respectively arranged through rotating shafts, and the adjusting screw 15 is threadedly connected to the two nut seats 16;

[0084] The hinge seat 17 is connected to the upper support part 11 and the lower support part 12 through a detachable fixing member 18, so that the upper support part 11 and the lower support part 12 are sleeved on the end face of the building cable 4 through two folding arm assemblies;

[0085] Among them, the detachable fixing member 18 can be a bolt convenient for disassembly. The hinge seat 17 is detachably fixed through the bolt structure, and then the first driving part 1 and the second driving part 2 can be conveniently installed on the building cable 4.

[0086] By rotating the adjusting screw 15 to change the folding angle between the first hinge arm 13 and the second hinge arm 14, so that the upper support part 11 and the lower support part 12 are pressed against both sides of the building cable 4.

[0087] Further, the upper support part 11 includes an upper support frame 111, a track support 112, a driving roller 113, a driving track 114, and a track motor 115;

[0088] The lower support part 12 includes a lower support frame 121, a roller support 122, a first support roller 123, and a second support roller 124;

[0089] The cross-section of the upper support frame 111 is a U-shaped structure. The two sides of the upper support frame 111 are connected to two first hinge arms 13 through hinge seats 17. A track support 112 is fixedly connected in the inner cavity of the upper support frame 111. Driving rollers 113 are arranged at both ends of the track support 112. A driving track 114 is sleeved on the driving rollers 113. The track motor 115 is in transmission connection with the driving rollers 113 to drive the driving track 114 to rotate;

[0090] The cross-section of the lower support frame 121 is a U-shaped structure. Both sides of the lower support frame 121 are connected to two second articulated arms 14 through hinge seats 17. A roller support 122 is fixedly connected in the inner cavity of the lower support frame 121. A first support roller 123 and a second support roller 124 are rotatably arranged at both ends of the roller support 122.

[0091] The cavities of the U-shaped structures of the upper support frame 111 and the lower support frame 121 face each other, so that the drive track 114 and the first support roller 123 and the second support roller 124 can be abutted against the outside of the building cable 4.

[0092] Furthermore, the circumferential wheel surfaces of the first support roller 123 and the second support roller 124 are formed as concave arc surfaces, so that they can fit the building cable 4.

[0093] Furthermore, the cable fixing seat 5 includes a lower hoop 51, an upper hoop 52, and a connecting bolt 53;

[0094] The actuating component 6 includes an eccentric component 61, an actuating motor 62, a rotating shaft 63, and a support bearing 64;

[0095] The lower hoop 51 and the upper hoop 52 are fixedly connected through the connecting bolt 53 to enclose and fix on the building cable 4; <...> (The original text seems to be incomplete here. If there is no specific content, it can be directly translated as follows) A plurality of cable fixing seats 5 are fixed on the building cable 4. The lower part of the actuating motor 62 is fixedly connected to the building cable 4 through two cable fixing seats 5;

[0097] The rotating shaft 63 of the actuating motor 62 extends out at both ends of the actuating motor 62. Eccentric components 61 are respectively fixed on the rotating shaft 63 on both sides of the actuating motor 62. The outermost sides at both ends of the rotating shaft 63 are rotatably connected to the cable fixing seat 5 through support bearings 64, and the two ends of the rotating shaft 63 are supported on the building cable 4 through the cable fixing seat 5.

[0098] Furthermore, the eccentric component 61 includes a disc base 611, a mass block 61, and a fixing component 613;

[0099] The disc base 611 is fixed on the rotating shaft 63 through a keyway. Four phases are equally divided in the circumferential direction of the disc base 611. An installation position of the fixing component 613 is provided at each phase position, and the mass block 612 is installed in the corresponding phase of the disc base 611 through the fixing component 613;

[0100] The mass block 612 is installed in a single phase / two adjacent phases / three adjacent phases of the disc base 611 , so that the mass center of the eccentric component 61 deviates from the rotation center of the eccentric component 61 .

[0101] Among them, when the mass blocks 612 on the two disc bases 611 are distributed in the same phase, the disc bases 611 can generate eccentric forces upward or downward at the same time when they rotate; when the mass blocks 612 on the two disc bases 611 are distributed in different phases, one of the disc bases 611 can generate an upward eccentric force when it rotates, and the other disc base 611 can generate a downward eccentric force when it rotates, thereby generating vibrations of different frequencies.

[0102] Furthermore, the phase positions of the masses 612 on the two disk bases 611 are the same or different, thereby generating vibrations of different forms.

[0103] A method for actively detecting the health of cables in service, using the above detection device, includes the following steps:

[0104] Step a, installing and fixing the actuating assembly 6 to a conveniently operable position of the in-service building cable 4 through the cable fixing seat 5;

[0105] Step b, installing the first driving part 1 and the second driving part 2 on the detection assembly 3 on the same building cable 4;

[0106] Step c, controlling the linear drive unit 32 to an initial contracted state, and applying adhesive to the sides of the detection grating 36 and the optical fiber 37 facing the building cable 4;

[0107] Step d: starting the crawler motor 115 to move the detection assembly 3 to the position of the building cable 4 to be detected, and controlling the linear drive unit 32 to press the detection grating 36 and the optical fiber 37 against the surface of the building cable 4;

[0108] In step e, a specific number of mass blocks 612 are installed on the disc base 611, and the actuator motor 62 is started to rotate the eccentric component 61 while generating a fixed frequency vibration. The vibration is transmitted through the building cable 4 and received by the detection component 3 to detect the health status of the building cable 4.

[0109] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An active health detection device for in-service building cables, comprising a first drive unit (1) and a second drive unit (2) of identical structure, a detection assembly (3), a cable fixing seat (5) and an actuating assembly (6), characterized in that: The actuating assembly (6) is fixedly mounted on the in-service building cable (4) via the cable fixing seat (5); the actuating assembly (6) is capable of generating vibrations of various waveforms, and the vibrations are applied to the building cable (4) via the cable fixing seat (5); The detection component (3) is provided with a first driving part (1) and a second driving part (2) at both ends. The first driving part (1) and the second driving part (2) are detachably mounted on the same building cable (4). The detection component (3) is moved to a position to be detected on the building cable (4) by the first driving part (1) and the second driving part (2); After the detection component (3) reaches the position to be detected, the photoelectric detection component is pressed against the surface of the building cable (4) through the telescopic component; The demodulation module of the detection component (3) emits broad spectrum light into the photoelectric detection component, and demodulates various reflection parameters of the broad spectrum light after passing through the photoelectric detection component; The detection component (3) comprises a support beam (31), a linear drive unit (32), a movable substrate (33), an elastic support component (34), a photoelectric detection component and a communication unit (38); The photoelectric detection component includes a communication connection portion (35), a detection grating (36) and an optical fiber (37); The two ends of the support beam (31) are respectively connected to the first drive unit (1) and the second drive unit (2); the support beam (31) is approximately a C-shaped structure; a plurality of linear drive units (32) are provided on the side of the support beam (31) facing the building cable (4); a movable base plate (33) is provided on the movable end of the linear drive unit (32); a plurality of elastic support components (34) are provided on the movable base plate (33); and a communication connection unit (35) is provided on a common support of the plurality of elastic support components (34); The communication connection portion (35) is provided with a plurality of detection gratings (36) through an elastic fixing structure, and the plurality of detection gratings (36) are provided with optical fibers (37); The communication part (38) is arranged on the support beam (31), and the communication part (38) is electrically connected to the communication connection part (35), the detection grating (36) and the optical fiber (37); the cable fixing seat (5) includes a lower hoop (51), an upper hoop (52) and a connecting bolt (53); The actuating assembly (6) comprises an eccentric assembly (61), an actuating motor (62), a rotating shaft (63), and a supporting bearing (64); The lower hoop (51) and the upper hoop (52) are fixedly connected by connecting bolts (53) to enclose and fix on the building cable (4); A plurality of cable fixing seats (5) are fixed on the building cable (4), and the lower portion of the actuating motor (62) is fixedly connected to the building cable (4) via two cable fixing seats (5); The rotating shaft (63) of the actuating motor (62) extends out from both ends of the actuating motor (62), and eccentric components (61) are fixed to the rotating shafts (63) on both sides of the actuating motor (62), respectively. The outermost sides of both ends of the rotating shaft (63) are rotatably connected to the cable fixing seat (5) through support bearings (64), and the two ends of the rotating shaft (63) are supported on the building cable (4) through the cable fixing seat (5); The eccentric assembly (61) comprises a disc base (611), a mass block (612), and a fixing assembly (613); The disc base (611) is fixed to the rotating shaft (63) via a keyway. The disc base (611) is equally divided into four phases in the circumferential direction. An installation position of a fixing assembly (613) is provided at each phase position. The mass block (612) is installed in the corresponding phase of the disc base (611) via the fixing assembly (613). The mass block (612) is installed in a single phase / two adjacent phases / three adjacent phases of the disc base (611), thereby causing the mass center of the eccentric component (61) to deviate from the rotation center of the eccentric component (61).

2. The active health detection device for in-service building cables according to claim 1 is characterized in that: The detection grating (36) and the optical fiber (37) are close to the building cable (4) and can twist along with the vibration of the building cable (4); The detection grating (36) is a Bragg grating with the same parameters, and the optical fiber (37) is a bare optical fiber; The vibration generated by the actuating assembly (6) is transmitted through the building cable (4), causing the detection grating (36) and the optical fiber (37) to twist. The wide spectrum emitted by the demodulation module enters the optical fiber (37) on the detection grating (36) and is refracted. The refracted spectrum parameters are obtained by the demodulation module, and the swing deformation of the building cable (4) is determined by the detected spectrum parameters, thereby judging the health status of the building cable (4).

3. The active health detection device for in-service building cables according to claim 2 is characterized in that: The first driving part (1) and the second driving part (2) have the same structure and both comprise an upper support part (11), a lower support part (12), a folding arm assembly and a hinge seat (17); Both sides of the upper support portion (11) are connected to the folding arm assembly via a hinge seat (17), and the other end of the folding arm assembly is connected to the lower support portion (12) via a hinge seat (17); The folding arm assembly comprises a first hinged arm (13), a second hinged arm (14), an adjusting screw (15) and a nut seat (16); The first hinged arm (13) and the second hinged arm (14) are rotatably connected via a hinge joint (19); The middle parts of the first hinged arm (13) and the second hinged arm (14) are respectively provided with nut seats (16) through a rotating shaft, and the two nut seats (16) are threadedly connected to the adjusting screw (15); The articulated seat (17) is connected to the upper support part (11) and the lower support part (12) through a detachable fixing member (18), so that the upper support part (11) and the lower support part (12) are sleeved on the end surface of the building cable (4) through two folding arm assemblies; By rotating the adjusting screw rod (15) to change the folding angle between the first articulated arm (13) and the second articulated arm (14), so that the upper support part (11) and the lower support part (12) are pressed against both sides of the building cable (4).

4. An in-service building cable health active detection device according to claim 3, characterized in that: The upper support part (11) includes an upper support frame (111), a crawler support (112), a driving roller (113), a driving crawler (114), and a crawler motor (115); The lower support part (12) includes a lower support frame (121), a roller support (122), a first support roller (123), and a second support roller (124); The cross-section of the upper support frame (111) is a U-shaped structure. Both sides of the upper support frame (111) are connected to two first articulated arms (13) through an articulated seat (17). A crawler support (112) is fixedly connected in the inner cavity of the upper support frame (111). Driving rollers (113) are arranged at both ends of the crawler support (11), and a driving crawler (114) is sleeved on the driving rollers (113). The crawler motor (115) is in transmission connection with the driving rollers (113) to drive the driving crawler (114) to rotate; The cross-section of the lower support frame (121) is a U-shaped structure. Both sides of the lower support frame (121) are connected to two second articulated arms (14) through an articulated seat (17). A roller support (122) is fixedly connected in the inner cavity of the lower support frame (121). A first support roller (123) and a second support roller (124) are rotatably arranged at both ends of the roller support (122).

5. An in-service building cable health active detection device according to claim 4, characterized in that: The circumferential wheel surfaces of the first support roller (123) and the second support roller (124) are formed into concave arc surfaces, so as to be able to fit the building cable (4).

6. An in-service building cable health active detection device according to claim 5, characterized in that: The positions of the phases where the mass blocks (612) on the two disc bases (611) are distributed are the same or different, so as to be able to generate different forms of vibration.

7. A method for actively detecting the health of cables in service, using the detection device according to claim 6, characterized in that: It includes the following steps: Step a, install and fix the actuating component (6) at an easy-to-operate position of the in-service building cable (4) through the cable fixing seat (5); Step b, install the first driving part (1) and the second driving part (2) on the detection component (3) on the same building cable (4); Step c, control the linear driving part (32) to be in an initial contracted state, and apply an adhesive on the side surfaces of the detection grating (36) and the optical fiber (37) facing the building cable (4); Step d, starting the crawler motor (115) to move the detection assembly (3) to the position of the building cable (4) to be detected, and controlling the linear drive unit (32) to press the detection grating (36) and the optical fiber (37) tightly against the surface of the building cable (4); In step e, a specific number of mass blocks (612) are installed on the disc base (611), and the actuating motor (62) is started to rotate the eccentric component (61) while generating a fixed frequency vibration. The vibration is transmitted through the building cable (4) and then received by the detection component (3), thereby detecting the health status of the building cable (4).

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