Cable fault detection device

Abstract

The invention relates to a cable fault detection device. The cable fault detection device comprises a detection instrument which is provided with a detection clamp; the shielding box is provided with a first cavity, a containing cavity, a conveying opening and a communication opening, the conveying opening and the communication opening are communicated with the containing cavity, the first cavity and the containing cavity are mutually independent, the first cavity surrounds the periphery of the containing cavity, the conveying opening is used for inputting a cable, the containing cavity is used for placing the cable, and the detection clamp is arranged in the containing cavity through the communication opening; the detection clamp is used for clamping a cable; and the separation structure is arranged in the first cavity so as to separate the first cavity into a plurality of empty bins, and the empty bins are used for blocking the transmission of the signal waves. Through the technical scheme provided by the invention, the problem of low detection accuracy of a cable fault detection device in the related technology can be solved.

Description

Technical Field

[0001] The present application relates to the field of cable detection technology, and in particular to a cable fault detection device. Background Art

[0002] Cable fault detection devices are used to detect faults in power cables. They use sensors to detect electric and magnetic fields, or other signals, around the cable. However, in complex electromagnetic environments, signals of different frequencies can interfere with each other, causing crosstalk and preventing the sensor from accurately identifying the target signal. In such cases, the sensor may mistakenly process the interfering signal as the target signal, resulting in a certain degree of deviation in the detection results. Summary of the Invention

[0003] Based on this, it is necessary to provide a cable fault detection device to address the problem of low detection accuracy of the cable fault detection device.

[0004] A cable fault detection device, the cable fault detection device includes: a detection instrument, the detection instrument has a detection clamp; a shielding box, the shielding box has a first cavity, a accommodating cavity, a conveying port and a connecting port, the conveying port and the connecting port are connected to the accommodating cavity, the first cavity and the accommodating cavity are independent of each other, and the first cavity is arranged around the outer periphery of the accommodating cavity, the conveying port is used to input the cable, the accommodating cavity is used to place the cable, the detection clamp extends into the accommodating cavity through the connecting port, and the detection clamp is used to be electrically connected to the cable; a partition structure is arranged in the first cavity to separate the first cavity into multiple empty compartments, and the empty compartments are used to hinder the transmission of signal waves.

[0005] In one embodiment, the shielding box further has a second cavity, which is arranged around the outer periphery of the accommodating cavity, and the first cavity is arranged around the outer periphery of the second cavity. The cable fault detection device further includes: a shielding member, which is arranged in the second cavity, and the shielding member is used to shield signal waves.

[0006] In one embodiment, the cable fault detection device further includes a conductive member, one end of the conductive member is electrically connected to the shielding member, and the other end of the conductive member is grounded.

[0007] In one embodiment, the shielding box includes: a sheath structure, the sheath structure is arranged in the accommodating cavity, one end of the sheath structure is connected to the delivery port, the sheath structure is used to be sleeved on the outside of the cable, and an extrusion part is provided inside the sheath structure, and the extrusion part is used to squeeze the cable to lose signal waves.

[0008] In one embodiment, the sheath structure includes: a first grading cover, which is arranged in the accommodating cavity, and the inner wall of the first grading cover is provided with a first threaded structure; a second grading cover, which is detachably connected to the first grading cover, and the inner wall of the second grading cover is provided with a second threaded structure. The second grading cover is cooperated with the first grading cover to surround the outside of the cable, and the first threaded structure and the second threaded structure cooperate to form an extrusion portion.

[0009] In one embodiment, the shielding box further includes: a box body having a first cavity and a accommodating cavity; a cover body arranged at the opening of the accommodating cavity, the cover body being used to cover the opening of the accommodating cavity, and a through hole being provided on the cover body; a guide tube, one end of the guide tube being connected to one end of the sheath structure through the through hole, and the other end of the guide tube having a delivery port.

[0010] In one embodiment, the partition structure includes: a plurality of partitions, which are spaced apart in the first cavity, one end of the partition is connected to the inner wall of one side of the first cavity, and the other end of the partition is connected to the inner wall of the other side of the first cavity.

[0011] In one embodiment, grooves and / or protrusions are provided on the side walls of the partition.

[0012] In one embodiment, the partition is a wave-shaped structure.

[0013] In one embodiment, the detection instrument includes an instrument box and an instrument body, the instrument body is arranged in the instrument box, and the instrument body has a detection clamp; the cable fault detection device also includes a connecting tube, one end of the connecting tube is connected to the accommodating cavity through a connecting port, and the other end of the connecting tube is slidably connected to the instrument box, the detection clamp extends into the accommodating cavity through the connecting tube, and an isolation member is provided in the connecting tube, and the isolation member is used to interfere with the signal wave.

[0014] In the aforementioned cable fault detection device, the cable enters the accommodating cavity through the delivery port. A partitioning structure divides the first cavity into multiple empty compartments, which can hinder the transmission of signal waves. A detection clamp passes through the communication port and clamps the cable within the accommodating cavity, while a detection instrument detects the cable line status. This arrangement allows the shielding box to wrap cable sections that are sensitive to signal interference and block interference signals from complex external electromagnetic environments, thereby weakening the interference effect of the signal and reducing the influence of signal crosstalk. Ultimately, when detecting cable faults, the detection instrument can accurately identify the target, further improving detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the cable fault detection device when the sealing cover is opened.

[0016] Figure 2 This is a structural schematic diagram of the cable fault detection device when the sealing cover is closed.

[0017] Figure 3 It is a side view of the cable fault detection device.

[0018] Figure 4 This is a top view of the cable fault detection device.

[0019] Figure 5 It is a cross-sectional view of the cable fault detection device and the connecting pipe.

[0020] Figure 6 for Figure 5 A partial enlarged view of point A in the middle.

[0021] Figure 7 It is a structural diagram of a cable fault detection device.

[0022] Figure 8 for Figure 7 A schematic structural diagram of the first grading cover and the box body of the device shown.

[0023] Description of reference numerals:

[0024] 10. Shielding box; 101. First cavity; 1011. Empty chamber; 102. Accommodating cavity; 103. Delivery port; 104. Second cavity; 105. Communication port;

[0025] 11. Sheath structure; 111. First grading cover; 1111. First thread structure; 112. Second grading cover; 1121. Second thread structure;

[0026] 12. Box body; 13. Cover body; 14. Guide tube;

[0027] 20. Partition structure; 21. Partition member; 211. Groove; 212. Protrusion;

[0028] 30. Shielding parts;

[0029] 40. Conductive parts;

[0030] 50. Testing instrument; 51. Instrument box; 511. Sealing cover; 52. Instrument body; 521. Testing clip;

[0031] 60. Connecting pipe; 61. Isolation piece. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0038] See Figures 1 to 5 The cable fault detection device provided in an embodiment of the present application includes a detection instrument 50, a shielding box 10 and a partition structure 20. The detection instrument 50 has a detection clamp 521. The shielding box 10 has a first cavity 101, a accommodating cavity 102, a delivery port 103 and a communication port 105. The delivery port 103 and the communication port 105 are connected to the accommodating cavity 102, the first cavity 101 and the accommodating cavity 102 are independent of each other, and the first cavity 101 is arranged around the outer periphery of the accommodating cavity 102. The delivery port 103 is used to input the cable, and the accommodating cavity 102 is used to place the cable. The detection clamp 521 extends into the accommodating cavity 102 through the communication port 105, and the detection clamp 521 is used to be electrically connected to the cable. The partition structure 20 is arranged in the first cavity 101 to divide the first cavity 101 into a plurality of empty compartments 1011, and the empty compartments 1011 are used to hinder the propagation of signal waves.

[0039] Using the technical solution of the present application, the cable enters the accommodating cavity 102 through the delivery port 103. The partition structure 20 divides the first cavity 101 into multiple empty compartments 1011, which can hinder the transmission of signal waves. The detection clamp 521 passes through the communication port 105 and clamps the cable in the accommodating cavity 102. The detection instrument 50 detects the status of the cable line. With this arrangement, the shielding box 10 can wrap the parts of the cable that are more sensitive to signal interference and block interference signals in the complex external electromagnetic environment, thereby weakening the interference effect of the signal and reducing the influence of signal crosstalk. Ultimately, when detecting cable faults, the detection instrument 50 can accurately identify the target, and the accuracy of detection can be further improved.

[0040] Specifically, in this embodiment, the cable fault detection device includes two shielding boxes 10, which are located on either side of the detection instrument 50. This arrangement enables simultaneous acquisition and processing of signals from both ends of the cable. Alternatively, in other embodiments, the shielding box 10 may be located only on one side of the detection instrument 50.

[0041] Since the empty space 1011 formed by the partition structure 20 can physically block electromagnetic waves, the partition structure 20 can be made of metal.

[0042] See Figure 5 The shielding box 10 also has a second cavity 104, which is arranged around the outer periphery of the accommodating cavity 102, and the first cavity 101 is arranged around the outer periphery of the second cavity 104. The cable fault detection device also includes a shielding member 30, which is arranged in the second cavity 104, and the shielding member 30 is used to shield the signal waves. In this way, the empty chamber 1011 serves as the main shielding body, which efficiently reflects and absorbs wide-band electromagnetic waves through its closed structure, and has a significant inhibitory effect on low-frequency magnetic fields and strong interference environments. Subsequently, the shielding member 30 further blocks high-frequency signals and compensates for the leakage that may be caused by the seams or openings of the empty chamber 1011. The shielding member 30 can shield the external signal waves again, thereby improving the shielding effect of the shielding box 10 and further preventing external signal waves from interfering with the detection structure.

[0043] Optionally, the shielding member 30 may be a shielding braided mesh, which is easily available in an actual production process. This can reduce the cost of the shielding member 30 and facilitate assembly of the shielding member 30 .

[0044] See Figure 5 The cable fault detection device further includes a conductive member 40 , one end of the conductive member 40 is electrically connected to the shielding member 30 , and the other end of the conductive member 40 is grounded.

[0045] When the shielding member 30 is energized, the charged shielding member 30 will generate an electric field, which will interact with the signal wave. When the signal wave passes through the charged shielding member 30, the signal wave will be affected by the electric field, thereby weakening or changing its propagation direction. This electric field shielding effect can cause greater obstruction to the signal wave and reduce the signal's penetration ability. Secondly, electric charges will accumulate on the surface of the charged shielding member 30. These charges will have additional attraction or repulsion on the signal wave. This charge accumulation effect will increase the scattering and attenuation of the signal wave on the surface of the shielding member 30, thereby increasing the degree of obstruction of the signal wave.

[0046] When shield 30 is charged and grounded, grounding neutralizes the charge on shield 30 and places it at the same potential as the ground. This helps eliminate static electricity on shield 30 and reduces the interference of charge accumulation on signal waves. Furthermore, grounding absorbs or repels charge from signal waves, further enhancing the shield's 30 blocking effect on signal waves. This effectively suppresses electromagnetic interference on the shield's surface and reduces the impact of external electromagnetic fields on signal waves, thereby enhancing the shield's 30 blocking effect on signal waves.

[0047] See Figure 5 、 Figure 7 and Figure 8 The shielding box 10 includes a sheath structure 11 disposed within a housing cavity 102. A shielding member 30 surrounds the outer periphery of the sheath structure 11. One end of the sheath structure 11 communicates with a delivery port 103. The sheath structure 11 is configured to be sheathed over the outer surface of the cable. An extrusion portion is disposed within the sheath structure 11 to compress the cable to attenuate signal waves. The extrusion portion imparts an uneven structure to the interior of the cable. When signal waves pass through the extrusion portion, they are attenuated, thereby reducing signal wave penetration.

[0048] Specifically, in the present application, the shielding box 10 includes multiple sheath structures 11, because a cable, such as a multi-core cable, usually has multiple metal wires, and the multiple metal wires are arranged in a one-to-one correspondence with the multiple sheath structures 11. The metal wires are located in the corresponding sheath structures 11. This enables independent detection of the multiple metal wires and improves the efficiency of cable fault detection.

[0049] Optionally, the main body of the sheath structure 11 may be made of metal or metal-coated plastic, and the extrusion portion may be made of metal.

[0050] See Figure 5 and Figure 8 The sheath structure 11 includes a first grading cover 111 and a second grading cover 112. The first grading cover 111 is arranged in the accommodating cavity 102, and the inner wall of the first grading cover 111 is provided with a first threaded structure 1111. The second grading cover 112 is detachably connected to the first grading cover 111, and the inner wall of the second grading cover 112 is provided with a second threaded structure 1121. The second grading cover 112 cooperates with the first grading cover 111 to surround the outer side of the cable, and the first threaded structure 1111 and the second threaded structure 1121 cooperate to form an extrusion portion. With such an arrangement, the first grading cover 111 and the second grading cover 112 cooperate to press the cable together, and facilitate the arrangement of the cable in the sheath structure 11, which is easy to operate. At the same time, the first threaded structure 1111 and the second threaded structure 1121 can enhance the unevenness of the interior of the cable, greatly improving the loss rate of the signal wave.

[0051] In the present application, the first grading cover 111 and the second grading cover 112 are connected by snap fastening.

[0052] Specifically, when the detection clamp 521 clamps the cable, the detection clamp 521 can extend into the sheath structure 11 , or the end of the cable extends outside the sheath structure 11 , and the detection clamp 521 is electrically connected to the cable outside the sheath structure 11 .

[0053] See Figures 1 to 3 The shielding box 10 includes a box body 12, a cover body 13 and a guide tube 14. The box body 12 has a first cavity 101 and a accommodating cavity 102. The cover body 13 is arranged at the opening of the accommodating cavity 102, and the cover body 13 is used to cover the opening of the accommodating cavity 102. A through hole is provided on the cover body 13. One end of the guide tube 14 is connected to one end of the sheath structure 11 through the through hole, and the other end of the guide tube 14 has a delivery port 103. In this way, the cover body 13 can ensure the sealing of the accommodating cavity 102 and avoid interference from external signal waves. In addition, the cable is passed through the guide tube 14, which is convenient for controlling the position of the cable, and then convenient for delivering the cable to the sheath structure 11, reducing the difficulty of the staff in detecting the cable.

[0054] Furthermore, in the present application, the shielding box 10 has a plurality of guide tubes 14 , which are arranged in a one-to-one correspondence with the plurality of sheath structures 11 , and one end of the guide tube 14 is communicated with the corresponding sheath structure 11 .

[0055] In the present application, the box body 12 includes a main body, an inner shell and a sleeve shell. The main body is fixedly connected to the sleeve shell. The inner shell is arranged between the main body and the sleeve shell. There is a first cavity 101 between the main body and the inner shell, a second cavity 104 between the sleeve shell and the inner shell, and the sleeve shell has a accommodating cavity 102.

[0056] The housing can be made of insulating materials such as plastic, rubber or ceramic, the body and cover 13 can be made of engineering plastic or metal composite materials, and the inner shell can be made of a metal frame with an insulating coating.

[0057] See Figure 5 The partition structure 20 includes a plurality of partitions 21, which are spaced apart within the first cavity 101. One end of the partition 21 is connected to the inner wall of one side of the first cavity 101, and the other end of the partition 21 is connected to the inner wall of the other side of the first cavity 101. This arrangement simplifies the structure of the partition structure 20, and the plurality of partitions 21 have the same structure, which facilitates assembly of the partition structure 20 and reduces the production cost of the partition structure 20.

[0058] Specifically, in the present application, the first cavity 101 includes two vertical cavities and one horizontal cavity, the two ends of the horizontal cavity are respectively connected to the two vertical cavities, the horizontal cavity is located at the bottom of the two vertical cavities, some partitions 21 are arranged in the vertical cavity along the extension direction of one vertical cavity, some partitions 21 are arranged in the vertical cavity along the extension direction of another vertical cavity, and the remaining partitions are arranged in the horizontal cavity along the extension direction of the horizontal cavity.

[0059] See Figure 6 The sidewall of the partition 21 is provided with a groove 211 and / or a protrusion 212. With this configuration, the empty chamber 1011 has a special-shaped structure, and the groove 211 and / or the protrusion 212 of the partition 21 can change the transmission direction of the signal wave, making the signal wave transmission path more complex, increasing the transmission path length of the signal wave, and improving the ability of the shielding box 10 to block interference signals in a complex external electromagnetic environment.

[0060] Specifically, the separator 21 has a wavy structure. This arrangement, using the separator 21 with this structure to form the empty chamber 1011, significantly increases the transmission path length of the signal wave and simultaneously enhances the signal wave shielding effectiveness of two adjacent empty chambers 1011. Furthermore, the grooves 211 and protrusions 212 can be formed simply by bending the separator 21, facilitating machining of the separator 21.

[0061] See Figure 1 The detection instrument 50 includes an instrument box 51 and an instrument body 52. The instrument body 52 is disposed within the instrument box 51 and has a detection clamp 521. The cable fault detection device also includes a connecting tube 60. One end of the connecting tube 60 communicates with the accommodating cavity 102 via a communication port 105, and the other end of the connecting tube 60 is slidably connected to the instrument box 51. The detection clamp 521 extends through the connecting tube 60 into the accommodating cavity 102. An isolator 61 is disposed within the connecting tube 60 to interfere with signal waves.

[0062] During the detection stage, the detection cable is embedded into the interior of the box body 12 through the guide tube 14. After being embedded into the interior of the box body 12, the detection end and the detection clamp 521 are connected, and the detection signal is independently transmitted to the instrument body 52 through the connecting tube 60. The cable itself does not enter the instrument box 51, and only the signal is transmitted through the connecting tube 60.

[0063] In addition, depending on the scope of use, the position of the shielding box 10 is changed by sliding the connecting tube 60 horizontally inside the instrument box 51. The distance between the shielding box 10 and the instrument box 51 is continuously changed by sliding the shielding box 10. By changing the position of the two groups of shielding boxes 10, the position when the cable circuit is connected is also changed. When detecting the node of this cable section, the shielding box 10 is selected to cover the main sensitive area of the cable to achieve the effect of reducing interference.

[0064] In addition, a limiting structure is provided at one end of the connecting tube 60 close to the instrument box 51 , for example, a baffle is provided at one end of the connecting tube 60 close to the instrument box 51 , and the limiting structure limits the sliding displacement of the connecting tube 60 to prevent the connecting tube 60 from falling off the instrument box 51 .

[0065] The connecting pipe 60 may be a structure in which a metal wire is embedded inside an insulating pipe, or a composite structure with an outer insulating layer and an inner metal shielding layer.

[0066] Optionally, the isolating member 61 is adhered to the inner wall of the connecting pipe 60 by gluing. The isolating member 61 may be a mesh structure, and the isolating member 61 may be a metal mesh.

[0067] See Figure 1 A sealing cover 511 is installed at the top opening of the instrument box 51 through a connector, and the sealing cover 511 and the top opening of the instrument box 51 are used in conjunction with each other.

[0068] To better understand this solution, the cable fault detection device is used as follows:

[0069] When performing power fault detection, the instrument body 52 is debugged in advance, the sealing cover 511 is closed after debugging, and the instrument body 52 is wrapped with the instrument box 51 and the sealing cover 511. On the one hand, the protection of the instrument body 52 can be increased, and on the other hand, the interference of the external environment can be reduced.

[0070] When covering the main sensitive area of the cable, the shielding box 10 can cut off the signal wave, hindering the continued propagation of the signal wave, thereby reducing the frequency and intensity of the signal wave that is interfered with during detection. The specific operation process is as follows:

[0071] First, a partition 21 is provided in the first cavity 101. When the signal wave passes through the uneven surface of the partition 21, reflection, scattering and multiple attenuations will occur. These processes will gradually dissipate the signal energy, thereby weakening the signal strength. Therefore, designing an uneven structure can increase the loss of the signal, making it difficult for the signal to propagate inside the cable, thereby achieving a shielding effect; in addition, the uneven surface will cause signal reflection and scattering, causing the signal to propagate in different directions. This multiple reflection and scattering will cause the signal to propagate in multiple paths inside the cable, making the signal transmission path more complex and increasing the length of the signal transmission path. In this way, the signal will experience more attenuation and loss during transmission, thereby reducing the interference effect of the signal;

[0072] When the signal wave is obstructed by the partition 21 and the empty chamber 1011, a large degree of loss will occur. In order to prevent the signal wave with a longer wavelength from penetrating the partition 21 and the empty chamber 1011, when the signal wave penetrates the inner shell and passes through the shielding member 30, the signal wave will be blocked by the shielding member 30.

[0073] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A cable fault detection device, characterized in that: The cable fault detection device comprises: A detection instrument (50), wherein the detection instrument (50) has a detection clamp (521); A shielding box (10), the shielding box (10) having a first cavity (101), a receiving cavity (102), a delivery port (103) and a communication port (105), the delivery port (103) and the communication port (105) being in communication with the receiving cavity (102), the first cavity (101) and the receiving cavity (102) being independent of each other, and the first cavity (101) being arranged around the periphery of the receiving cavity (102), the delivery port (103) being used for inputting a cable, the receiving cavity (102) being used for placing the cable, the detection clamp (521) extending into the receiving cavity (102) through the communication port (105), and the detection clamp (521) being used for electrically connecting to the cable; A partition structure (20) is provided in the first cavity (101) to separate the first cavity (101) into a plurality of empty compartments (1011), wherein the empty compartments (1011) are used to block the transmission of signal waves.

2. The cable fault detection device according to claim 1, characterized in that: The shielding box (10) further comprises a second cavity (104), the second cavity (104) being arranged around the periphery of the accommodating cavity (102), and the first cavity (101) being arranged around the periphery of the second cavity (104). The cable fault detection device further comprises: A shielding member (30) is arranged in the second cavity (104), and the shielding member (30) is used to shield signal waves.

3. The cable fault detection device according to claim 2, characterized in that: The cable fault detection device further comprises: A conductive member (40), one end of the conductive member (40) is electrically connected to the shielding member (30), and the other end of the conductive member (40) is grounded.

4. The cable fault detection device according to claim 1, characterized in that: The shielding box (10) comprises: A sheath structure (11) is provided in the accommodating cavity (102), one end of the sheath structure (11) is communicated with the delivery port (103), the sheath structure (11) is used to be sheathed on the outside of the cable, and an extrusion portion is provided inside the sheath structure (11), the extrusion portion is used to squeeze the cable to lose signal waves.

5. The cable fault detection device according to claim 4, characterized in that: The sheath structure (11) comprises: A first grading cover (111) is arranged in the accommodating cavity (102), and an inner wall of the first grading cover (111) is provided with a first thread structure (1111); A second grading cover (112) is detachably connected to the first grading cover (111); an inner wall of the second grading cover (112) is provided with a second threaded structure (1121); the second grading cover (112) cooperates with the first grading cover (111) to surround the outer side of the cable; the first threaded structure (1111) and the second threaded structure (1121) cooperate to form the extrusion portion.

6. The cable fault detection device according to claim 4, characterized in that: The shielding box (10) further comprises: A box body (12), the box body (12) having the first cavity (101) and the accommodating cavity (102); a cover body (13) disposed at the opening of the accommodating cavity (102), the cover body (13) being used to cover the opening of the accommodating cavity (102), and a through hole being provided on the cover body (13); A guide tube (14), one end of the guide tube (14) is connected to one end of the sheath structure (11) through the through hole, and the other end of the guide tube (14) has the delivery port (103).

7. The cable fault detection device according to claim 1, characterized in that: The partition structure (20) includes: A plurality of partitions (21), wherein the plurality of partitions (21) are arranged at intervals in the first cavity (101), one end of the partition (21) is connected to the inner wall of one side of the first cavity (101), and the other end of the partition (21) is connected to the inner wall of the other side of the first cavity (101).

8. The cable fault detection device according to claim 7, characterized in that: A groove (211) and / or a protrusion (212) is provided on the side wall of the separator (21).

9. The cable fault detection device according to claim 8, characterized in that: The separator (21) has a wave-shaped structure.

10. The cable fault detection device according to claim 1, characterized in that: The detection instrument (50) comprises an instrument box (51) and an instrument body (52), wherein the instrument body (52) is arranged in the instrument box (51), and the instrument body (52) has the detection clamp (521); the cable fault detection device further comprises a connecting tube (60), one end of the connecting tube (60) is connected to the accommodating cavity (102) through the communicating port (105), and the other end of the connecting tube (60) is slidably connected to the instrument box (51), and the detection clamp (521) extends into the accommodating cavity (102) through the connecting tube (60), and an isolating member (61) is arranged in the connecting tube (60), and the isolating member (61) is used to interfere with the signal wave.

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