Splicing device and method of using same

Abstract

The application provides a splicing device and a use method thereof, and relates to the technical field of communication cables. The splicing device comprises an optical fiber cable, an electrical transmission structure and a protective layer. The optical fiber cable comprises an optical transmission structure, an electrical transmission structure and a protective layer. The protective layer is wrapped around the outer periphery of the optical transmission structure and the electrical transmission structure. The optical transmission structure comprises a first optical fiber, a metal sheath and a metal inner armor. A second optical fiber is connected to the first optical fiber. The optical fiber cable and the second optical fiber are connected to an optical fiber splicing box through a first cable port and a second cable port, respectively, and the first optical fiber and the second optical fiber are connected. A first grounding wire is electrically connected to the metal inner armor at a first end and grounded at a second end. A second grounding wire is electrically connected to the metal sheath at a first end and grounded at a second end. The above technical solution connects the metal inner armor and the metal sheath to the ground, thereby protecting the optical transmission structure and the optical fiber cable.

Description

Technical Field

[0001] This application relates to the field of communication cable technology, and in particular to a splicing device and its usage method. Background Technology

[0002] Optical fiber composite cables are used as transmission lines in fields such as offshore wind farms and oil and gas platforms. They integrate optical fiber and power transmission, and can solve problems related to broadband access, equipment power supply, and signal transmission.

[0003] During the installation of the optical-electric composite cable, due to the long distance, it is necessary to use an optical fiber splice box to connect the optical transmission structure in the optical-electric composite cable.

[0004] However, after the connection is completed, the optical transmission structure of the optical-electric composite cable is prone to overheating during transmission, which can damage the optical-electric composite cable. Summary of the Invention

[0005] This application provides a splicing device and its usage method to solve the technical problem in the related art that the optical transmission structure of the optical composite cable is prone to overheating and damage during transmission, which is a problem in the optical composite cable.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] On one hand, this application provides a connection device, including:

[0008] An optoelectronic composite cable, comprising an optical transmission structure, an electrical transmission structure, and a protective layer, wherein the protective layer covers the outer periphery of the optical transmission structure and the electrical transmission structure, and the optical transmission structure comprises a first optical fiber, a metal sheath, and a metal inner armor arranged from the inside out.

[0009] A second optical fiber, which is connected to the first optical fiber;

[0010] An optical fiber splice box, the optical fiber splice box including a first cable inlet and a second cable inlet.

[0011] The optoelectronic composite cable and the second optical fiber are respectively connected to the optical fiber splice box through the first cable inlet and the second cable inlet, and the first optical fiber and the second optical fiber are connected together.

[0012] A first grounding wire, the first end of which is electrically connected to the metal inner armor, and the second end of which is grounded;

[0013] The second grounding wire has its first end electrically connected to the metal sheath and its second end grounded.

[0014] Based on the above technical solution, the following improvements can be made to this application.

[0015] In one possible implementation, the fiber optic splice box further includes an outlet for grounding the second end of the first grounding conductor and the second end of the second grounding conductor.

[0016] In one possible implementation, the fiber optic splice box further includes a seal installed at the outlet for sealing the outlet.

[0017] In one possible implementation, the seal is a stuffing box.

[0018] In one possible implementation, the connecting device further includes:

[0019] A copper pressure tube, which covers and presses against the first end of the first grounding conductor and the metal inner armor;

[0020] A terminal block is mounted on the metal sheath and is electrically connected to both the metal sheath and the first end of the second grounding wire.

[0021] In one possible implementation, the copper pressure tube is fitted with a fastening screw.

[0022] In one possible implementation, the splicing device further includes insulating tape that adheres to and covers the copper pressure tube.

[0023] In one possible implementation, the fiber optic splice box further includes a third grounding wire, the first end of which is electrically connected to the body of the fiber optic splice box, and the second end of which is grounded.

[0024] On the other hand, this application provides a method of using a connecting device, applicable to the connecting device in any of the above-mentioned solutions, the method of use comprising:

[0025] Straighten the optical-electric composite cable;

[0026] Remove the protective layer, metal inner armor, and metal sheath of the optical-electric composite cable to expose the first length of the metal inner armor, the second length of the metal sheath, and the third length of the first optical fiber.

[0027] The processed metal inner armor, the metal sheath, and the first cable inlet of the first optical fiber connector are sealed and fixed.

[0028] Electrically connect the first end of the first grounding wire to the metal inner armor;

[0029] Electrically connect the first end of the second grounding conductor to the metal sheath;

[0030] Connect the second optical fiber to the second cable inlet of the optical fiber splice box and seal and fix it.

[0031] Connect the first optical fiber and the second optical fiber;

[0032] Ground the second end of the first grounding wire and the second end of the second grounding wire.

[0033] Based on the above technical solution, the following improvements can be made to this application.

[0034] The connection between the first optical fiber and the second optical fiber includes:

[0035] Clean the first optical fiber and the second optical fiber;

[0036] The first optical fiber and the second optical fiber are fused together;

[0037] Test whether the first optical fiber and the second optical fiber are correctly connected.

[0038] The connecting device and its usage method provided in this application have the following beneficial effects:

[0039] The splicing device and its usage method provided in this application complete the fiber optic splicing by connecting the optoelectronic composite cable to the first cable inlet of the fiber optic splice box, connecting the second optical fiber to the second cable inlet of the fiber optic splice box, and connecting the first optical fiber in the optoelectronic composite cable to the second optical fiber. Compared with related technologies that directly connect optical fibers through the fiber optic splice box, the splicing device and its usage method provided in this application electrically connects the first end of the first grounding conductor to the metal inner armor of the optoelectronic composite cable and grounds the second end of the first grounding conductor, thereby grounding the metal inner armor. Similarly, by electrically connecting the first end of the second grounding conductor to the metal sheath of the optoelectronic composite cable and grounding the second end of the second grounding conductor, the metal sheath is grounded. This configuration allows the induced current generated by the operation of the electrical transmission structure in the optoelectronic composite cable to be discharged from the metal inner armor and metal sheath, preventing the metal inner armor and metal sheath from overheating and protecting the optical transmission structure and the optoelectronic composite cable. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the connection device structure provided in an embodiment of this application;

[0042] Figure 2 This is a schematic cross-sectional view of the connecting device provided in an embodiment of this application;

[0043] Figure 3 A schematic diagram of the optical transmission structure connection provided in the application embodiment.

[0044] Explanation of reference numerals in the attached figures:

[0045] 100-Optical fiber composite cable;

[0046] 110 - Optical transmission structure; 111 - First optical fiber; 112 - Metal sheath; 113 - Metal inner armor;

[0047] 200 - Second optical fiber;

[0048] 300-Fiber Optic Splice Box;

[0049] 310 - First cable inlet; 320 - Second cable inlet; 330 - Cable outlet; 340 - Seal;

[0050] 350 - Third connecting wire;

[0051] 400 - First grounding conductor;

[0052] 500 - Second grounding conductor;

[0053] 610 - Copper crimp tube; 620 - Terminal block; 630 - Insulating tape. Detailed Implementation

[0054] Typically, optical fiber composite cables suffer from a technical problem during transmission: the optical transmission structure easily overheats, damaging the cable. This is because the electrical transmission structure in the optical fiber composite cable generates an electric field when transmitting current. Since the metal inner armor and metal sheath in the optical transmission structure are conductors, under the influence of this electric field, induced charges and currents are formed within the metal inner armor and metal sheath. This causes the metal inner armor, metal sheath, and optical transmission structure to overheat, damaging the optical fiber composite cable.

[0055] To address the aforementioned technical problems, this application provides a connection device and its usage method. By electrically connecting the first end of the first grounding wire to the metal inner armor and grounding the second end of the first grounding wire, the metal inner armor is grounded, thus drawing out the induced charge in the metal inner armor and preventing the metal inner armor from overheating. By electrically connecting the first end of the second grounding wire to the metal sheath and grounding the second end of the second grounding wire, the metal sheath is grounded, thus drawing out the induced charge in the metal sheath and preventing the metal sheath from overheating, thereby protecting the optical transmission structure and the optoelectronic composite cable.

[0056] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0057] refer to Figure 1 and Figure 2 This application provides a splicing device, which includes an optical fiber composite cable 100, a second optical fiber 200, an optical fiber splice box 300, a first grounding wire 400, and a second grounding wire 500.

[0058] The optoelectronic composite cable 100 includes an optical transmission structure 110, an electrical transmission structure, and a protective layer. The optical transmission structure 110 is used to transmit optical signals, the electrical transmission structure is used to transmit electrical signals, and the protective layer covers the outer periphery of the optical transmission structure 110 and the electrical transmission structure, thereby protecting the optical transmission structure 110 and the electrical transmission structure.

[0059] like Figure 3 As shown, the optical transmission structure 110 includes a first optical fiber 111, a metal sheath 112, and a metal inner armor 113 arranged from the inside out. The first optical fiber 111 is used to transmit optical signals. The metal sheath 112 wraps around the first optical fiber 111, forming protection and support for the first optical fiber 111. The metal sheath 112 can be made of stainless steel or aluminum alloy. The metal sheath 112 and the first optical fiber 111 form the cable core. The metal inner armor 113 wraps around the cable core, for example, by braiding or winding the metal inner armor 113 around the cable core. The metal inner armor 113 is used to protect the cable core, prevent the cable core from being bitten or burned, and improve the tensile and compressive strength of the optical transmission structure. The metal inner armor 113 can be galvanized steel strip, copper strip, aluminum alloy strip, etc.

[0060] The second optical fiber 200 is the connection target of the optoelectronic composite cable 100. The second optical fiber 200 can be an optical fiber in another optoelectronic composite cable, or it can be an optical fiber in an optical cable that only transmits optical signals. The second optical fiber 200 is connected to the first optical fiber 111.

[0061] Fiber optic splice box 300 is used to connect the first fiber 111 and the second fiber 200, such as Figure 2As shown, the fiber optic splice box 300 includes a first cable inlet 310 and a second cable inlet 320. The first cable inlet 310 and the second cable inlet 320 are used to introduce the optoelectronic composite cable 100 and the second optical fiber 200. For example, the optoelectronic composite cable 100 is connected to the fiber optic splice box 300 through the first cable inlet 310, and the second optical fiber 200 is connected to the fiber optic splice box 300 through the second cable inlet 320. The first optical fiber 111 and the second optical fiber 200 are connected in the fiber optic splice box 300. For example, after stripping part of the protective layer, metal inner armor 113 and metal sheath 112 of the optoelectronic composite cable 100 to expose the first optical fiber 111, the first optical fiber 111 and the second optical fiber 200 are connected.

[0062] The first grounding conductor 400 is used to ground the metal inner armor 113. The first end of the first grounding conductor 400 is electrically connected to the metal inner armor 113, and the second end of the first grounding conductor 400 is grounded. For example, the second end of the first grounding conductor 400 is buried underground or connected to the grounding grid, and then the lead wire of the grounding grid is buried underground.

[0063] The second grounding conductor 500 is used to ground the metal sheath 112. The first end of the second grounding conductor 500 is electrically connected to the metal sheath 112, and the second end of the second grounding conductor 500 is grounded. For example, the second end of the second grounding conductor 500 is buried underground or connected to the grounding grid, and then the lead wire of the grounding grid is buried underground.

[0064] This application provides a splicing device that connects a first optical fiber 111 and a second optical fiber 200 to an optical cable splice box 300 via a first cable inlet 310 and a second cable inlet 320, respectively, thereby achieving optical fiber splicing. The first optical fiber 111 is connected to the second optical fiber 200. A first grounding wire 400 grounds the inner metal armor 113, and a second grounding wire 500 grounds the outer metal sheath 112. This draws out the current induced in the electrical connection structure of the inner metal armor 113 and the outer metal sheath 112, preventing them from overheating and thus protecting the optical connection structure and the optoelectronic composite cable.

[0065] In some embodiments, the fiber optic splice cassette 300 further includes an outlet 330, such as Figure 2 As shown, the outlet 330 is located on the top cover of the fiber optic splice box 300. It should be noted that the outlet 330 can also be located on any side wall of the fiber optic splice box 300. The outlet 330 facilitates the exit of the first grounding conductor 400 and the second grounding conductor 500 from the fiber optic splice box 300. There can be two outlets 330, such as... Figure 2As shown, the first grounding wire 400 and the second grounding wire 500 are respectively led out from two outlets 330. Alternatively, there can be only one outlet 330, with both the first grounding wire 400 and the second grounding wire 500 leading out from the same outlet 330, but insulation between the first grounding wire 400 and the second grounding wire 500 must be ensured to prevent mutual interference. By providing outlets 330 in the fiber optic splice box 300, the second ends of the first grounding wire 400 and the second grounding wire 500 can be easily grounded.

[0066] Based on the above embodiments, the fiber optic splice box 300 further includes a sealing element 340. The sealing element 340 is used to seal the outlet 330. The sealing element 340 is installed at the outlet 330 and can be a rubber sealing ring. Taking the rubber sealing ring sealing the outlet 330 corresponding to the first grounding wire 400 as an example, the inner wall of the rubber sealing ring tightly hugs the first grounding wire 400, and the outer wall of the rubber sealing ring adheres to the inner wall of the outlet 330, thereby achieving a seal between the first grounding wire 400 and the corresponding outlet 330. The sealing of the outlet 330 is the same as described above when the second grounding wire 500 is sealed to the corresponding outlet 330 by a rubber sealing ring, and when the first grounding wire 400 and the second grounding wire 500 are led out from the same outlet 330. This will not be elaborated further. Sealing the outlet 330 with the sealing element 340 can increase the sealing performance of the fiber optic splice box 300.

[0067] In some embodiments, such as Figure 2 As shown, the sealing element 340 can be a stuffing box, which may include a hollow main structure and packing. The main structure is installed at the outlet 330, and the grounding wire passes through the cavity inside the main structure. The grounding wire can be any one of the first grounding conductor 400, the second grounding conductor 500, or a combination of both. Packing fills the space between the grounding wire and the main structure. The packing can be polytetrafluoroethylene asbestos packing, carbon graphite packing, rubber asbestos packing, etc., thereby achieving a seal. Sealing via a stuffing box provides a good sealing effect and facilitates maintenance.

[0068] refer to Figure 3 In some embodiments, the connection device further includes a copper pressure tube 610 and a terminal block 620. The copper pressure tube 610 can be a hollow short copper tube that covers and presses against the first end of the first grounding wire 400 and the metal inner armor 113. For example, the first grounding wire 400 and the metal inner armor 113 are both inserted into the copper pressure tube 610, and the copper pressure tube has a recessed portion that presses against the first grounding wire 400 and the metal inner armor 113, so that the first end of the first grounding wire 400 and the metal inner armor 113 are electrically connected. This arrangement ensures a stable connection between the first grounding wire 400 and the metal inner armor 113.

[0069] The terminal block 620 is a product for realizing electrical connection. The terminal block 620 is mounted on the metal sheath 112 and is electrically connected to both the metal sheath 112 and the first end of the second grounding wire 500. For example, the terminal block 620 includes a metal tab and an insulating body. The insulating body has a receiving cavity, and a conductor is installed within the receiving cavity. The receiving cavity has a first interface and a second interface. The first end of the conductor is exposed at the first interface, and the second end is exposed at the second interface. The metal sheath 112 is installed at the first interface via a threaded connection and contacts the first end of the conductor. The first end of the second grounding wire 500 passes through the second interface and contacts the second end of the conductor. This configuration allows for convenient electrical connection between the first end of the second grounding wire and the metal sheath 112, resulting in a simple structure and easy maintenance.

[0070] Based on the above embodiments, the copper pressure tube 610 is provided with a fastening screw. If the fastening screw is provided along the diameter of the copper pressure tube 610, it can prevent the copper pressure tube 610 from pressing the first end of the first grounding wire 400 and the metal inner armor 113 from being unstable. The fastening screw can also be provided in the recess of the copper pressure tube 610 to further increase the stability of the copper pressure tube 610 pressing the first end of the first grounding wire 400 and the metal inner armor 113.

[0071] In some embodiments, reference Figure 3 The connection device also includes insulating tape 630, which is applied to and wrapped around the copper pressure tube 610, thereby insulating the copper pressure tube 610 and preventing leakage. The insulating tape can be polyester tape, polyethylene tape, linen tape, etc. It should be noted that insulating tape 630 can also be wrapped around the terminal 620 to prevent leakage at the terminal 620.

[0072] In some embodiments, reference Figure 1 The fiber optic splice box 300 also includes a third grounding conductor 350, which is used to ground the box body of the fiber optic splice box 300 to protect the fiber optic splice box 300. The first end of the third grounding conductor 350 is connected to the box body of the fiber optic splice box 300. For example, a grounding bolt is installed on the box body of the fiber optic splice box 300, the first end of the third grounding conductor 350 is wound around the grounding bolt, and tightened with a nut. The second end of the third grounding conductor 350 is grounded, for example, by burying the second end of the third grounding conductor 350 underground or connecting it to a grounding grid, and then burying the lead wire of the grounding grid underground.

[0073] This application also provides a method of using a connecting device, applicable to any of the connecting devices described above, the method of use including:

[0074] Straighten the optical fiber composite cable 100, such as fixing one end of the optical fiber composite cable 100 and tightening the other end.

[0075] The protective layer, inner metal armor 113, and metal sheath 112 of the optical-electric composite cable 100 are removed, exposing a first length of the inner metal armor 113, a second length of the metal sheath 112, and a third length of the first optical fiber 111. For example, refer to... Figure 3 The protective layer is partially peeled off with scissors, exposing the metal inner armor 113. Then, a cutter, wire strippers, or other tools are used to remove part of the exposed metal inner armor 113, leaving a metal inner armor 113 of a first length, exposing the metal sheath 112. Finally, an electrician's knife is used to remove part of the exposed metal sheath 112, leaving a metal sheath 112 of a second length, exposing the first optical fiber 111, forming the first optical fiber 111 of a third length. The first length can range from 10 to 20 centimeters, the second length from 20 to 40 centimeters, and the third length from 100 to 200 centimeters.

[0076] The processed metal inner armor 113, metal sheath 112, and first optical fiber 111 are connected to the first cable inlet 310 of the optical fiber splice box 300 and sealed and fixed. The processed metal inner armor 113, metal sheath 112, and first optical fiber 111 are the exposed metal inner armor 113, metal sheath 112, and first optical fiber 111 after the above steps. The sealing and fixing method can be to use a stuffing gland at the first cable inlet 310 for sealing and fixation by threaded connection.

[0077] The first end of the first grounding wire 400 is electrically connected to the metal inner armor 113. For example, the first end of the first grounding wire 400 and the metal inner armor 113 are crimped together by a copper crimp tube 610 to achieve the electrical connection between the first end of the first grounding wire 400 and the metal inner armor 113.

[0078] The first end of the second grounding wire 500 is electrically connected to the metal sheath 112. For example, both the first end of the second grounding wire 500 and the metal sheath 112 are connected to the terminal block 620, and the second end of the second grounding wire 500 is electrically connected to the metal sheath 112 through the terminal block 620.

[0079] The second optical fiber 200 is connected to the second cable inlet 320 of the optical fiber splice box 300 and sealed and fixed. For example, a stuffing box is installed at the second cable inlet 320 for sealing, and it is fixed by threaded connection.

[0080] Connect the first optical fiber 111 and the second optical fiber 200. For example, connect the first optical fiber 111 and the second optical fiber 200 by fusion splicing.

[0081] The second end of the first grounding conductor 400 and the second end of the second grounding conductor 500 are grounded. For example, the second ends of the first grounding conductor 400 and the second ends of the second grounding conductor 500 are led out through the outlet 330 of the optical fiber splice box 300 and buried underground or connected to the grounding grid.

[0082] The method of using the splicing device provided in this application embodiment involves connecting the first optical fiber 111 and the second optical fiber 200 within the optical fiber splice box 300, grounding the metal inner armor 113 via the first grounding wire 400 to prevent overheating and damage to the metal inner armor 113, and grounding the metal sheath 112 via the second grounding wire 500 to prevent overheating and damage to the metal sheath 112. This protects the optical transmission structure 110 and the optoelectronic composite cable 100.

[0083] Based on the above embodiments, connecting the first optical fiber 111 and the second optical fiber 200 includes:

[0084] Clean the first optical fiber 111 and the second optical fiber 200. For example, clean the first optical fiber 111 and the second optical fiber 200 with anhydrous alcohol. This avoids damage to the first optical fiber 111 and the second optical fiber 200 by impurities.

[0085] The first optical fiber 111 and the second optical fiber 200 are fused together. For example, the first optical fiber 111 and the second optical fiber 200 are fused together using an optical fiber fusion splicer.

[0086] Test whether the first optical fiber 111 and the second optical fiber 200 are correctly connected. For example, input an optical signal into the first optical fiber 111 and detect whether there is an optical signal output in the second optical fiber 200. If there is, then the first optical fiber 111 and the second optical fiber 200 are correctly connected.

[0087] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0088] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0089] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0090] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0091] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0092] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0093] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A connecting device, characterized in that, include: An optoelectronic composite cable, comprising an optical transmission structure, an electrical transmission structure, and a protective layer, wherein the protective layer covers the outer periphery of the optical transmission structure and the electrical transmission structure, and the optical transmission structure comprises a first optical fiber, a metal sheath, and a metal inner armor arranged from the inside out. The second optical fiber is used to connect to the first optical fiber; An optical fiber splice box, the optical fiber splice box including a first cable inlet and a second cable inlet. The optoelectronic composite cable and the second optical fiber are respectively connected to the optical fiber splice box through the first cable inlet and the second cable inlet, and the first optical fiber and the second optical fiber are connected together. A first grounding wire, the first end of which is electrically connected to the metal inner armor, and the second end of which is grounded; The second grounding wire has a first end electrically connected to the metal sheath and a second end grounded. A copper pressure tube covers and presses against the first end of the first grounding wire and the metal inner armor. The copper pressure tube has a recessed portion that presses against the first end of the first grounding wire and the metal inner armor. A fastening screw passes through the copper pressure tube and passes through the recessed portion. A terminal block is mounted on the metal sheath and is electrically connected to both the metal sheath and the first end of the second grounding wire. The terminal block includes a metal tab and an insulating body. The insulating body has a receiving cavity, and a conductor is installed in the receiving cavity. The receiving cavity has a first interface and a second interface. The first end of the conductor is exposed at the first interface, and the second end is exposed at the second interface. The metal sheath is installed at the first interface via a threaded connection and contacts the first end of the conductor. The first end of the second grounding wire passes through the second interface and contacts the second end of the conductor. Insulating tape, which is used to bond to and cover the copper pressure tube.

2. The connecting device according to claim 1, characterized in that, The fiber optic splice box also includes an outlet, which is used for grounding the second end of the first grounding conductor and the second end of the second grounding conductor.

3. The connecting device according to claim 2, characterized in that, The fiber optic splice box also includes a seal, which is installed at the outlet and is used to seal the outlet.

4. The connecting device according to claim 3, characterized in that, The sealing element is a stuffing box.

5. The connecting device according to claim 1, characterized in that, The fiber optic splice box also includes a third grounding wire, the first end of which is electrically connected to the body of the fiber optic splice box, and the second end of which is grounded.

6. A method of using a connecting device, characterized in that, Applied to the connecting device according to any one of claims 1-5, the method of use includes: Straighten the optical-electric composite cable; Remove the protective layer, metal inner armor, and metal sheath of the optical-electric composite cable to expose the first length of the metal inner armor, the second length of the metal sheath, and the third length of the first optical fiber. The processed metal inner armor, the metal sheath, and the first cable inlet of the first optical fiber connector are sealed and fixed. Electrically connect the first end of the first grounding wire to the metal inner armor; Electrically connect the first end of the second grounding conductor to the metal sheath; Connect the second optical fiber to the second cable inlet of the optical fiber splice box and seal and fix it. Connect the first optical fiber and the second optical fiber; Ground the second end of the first grounding wire and the second end of the second grounding wire.

7. The method of use according to claim 6, characterized in that, The connection between the first optical fiber and the second optical fiber includes: Clean the first optical fiber and the second optical fiber; The first optical fiber and the second optical fiber are fused together; Test whether the first optical fiber and the second optical fiber are correctly connected.

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