Optical cable and preparation method thereof

Abstract

The invention provides an optical cable and a preparation method thereof, and relates to the technical field of optical cables, the optical cable comprises an optical cable main body and an optical cable joint, the optical cable joint is connected to one end of the optical cable main body, and the joint of the optical cable joint and the optical cable main body is sleeved with a protection assembly; the optical cable main body comprises a micro strain optical fiber, a tight tube optical unit, a loose tube optical unit, an embossed steel tape armor, a PE inner sheath and a PE outer sheath. Through arrangement of the protection assembly, the sealing assembly, the fixing assembly and the control assembly, efficient protection of the optical cable joint in a severe environment is realized. Firstly, the protection assembly adopts the high-strength protection shell and is combined with the gate assembly and the auxiliary fixing structure, so that the optical cable can be kept stable when being impacted by external force, pulled force or vibrated, and the safety of the optical cable in the transportation process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical cables, and particularly to an optical cable and a preparation method thereof. Background Art

[0002] An outdoor optical cable connector is a key optical communication device used to connect outdoor optical cables to ensure efficient and stable transmission of optical signals between different optical cable segments. Outdoor optical cables are usually used to connect between buildings, public roads, highways, beside railway tracks, riverbeds, and various other environments, with a wide range of applications. The outdoor optical cable connector is an important component for realizing the connection between these optical cables. In the communication field, outdoor optical cables are one of the main ways to transmit data, which can connect people through a large-scale communication network. The optical cable connector is the key component to achieve this connection, and its performance directly affects the transmission quality of optical signals and the stability of the communication system.

[0003] In the prior art, there is a lack of a protection structure at the connection between the optical cable main body and the optical fiber connector, resulting in easy damage at the connection between the optical cable main body and the optical fiber connector. Summary of the Invention

[0004] The present invention provides an optical cable and a preparation method thereof to solve the defect in the prior art that there is a lack of a protection structure at the connection between the optical cable main body and the optical fiber connector, resulting in easy damage at the connection between the optical cable main body and the optical fiber connector.

[0005] On the one hand, the present invention provides an optical cable and a preparation method thereof, including an optical cable main body and an optical cable joint. The optical cable joint is connected to one end of the optical cable main body, and a protection component is sleeved at the connection between the optical cable joint and the optical cable main body, and a control component is arranged outside the protection component; The optical cable main body includes a micro-strain optical fiber, a tight-buffered optical unit, a loose-tube optical unit, a corrugated steel tape armor, a PE inner sheath, and a PE outer sheath.

[0006] Preferably, the protection component includes a protection shell. One end of the protection shell close to the optical cable main body is fixedly connected with a protection wall, and a gate component is installed at the end of the protection shell far from the optical cable main body.

[0007] Preferably, two groups of front-back symmetric first auxiliary fixing components are further arranged on the inner wall of the protection shell. The first auxiliary fixing component includes a first spring. One end of the first spring is fixedly connected to the inner wall of the protection shell, and the other end of the first spring is fixedly connected to a limiting plate.

[0008] Preferably, the gate component includes two front-back symmetrically arranged blocking blocks and two groups of door body components sliding in the up-down direction. The blocking blocks are fixedly connected to the end of the protection shell far from the optical cable main body, and the two groups of door body components are symmetrically arranged on the upper and lower sides of the blocking blocks.

[0009] Preferably, a set of first control grooves along the vertical direction are respectively arranged in the front and rear side walls on the side of the protection housing away from the optical cable main body. The upper door body assembly includes two first door panels and one second door panel. The two first door panels are symmetrically arranged in front and rear above the two blocking blocks respectively. The front and rear side walls of the second door panel are respectively slidably connected to the two first door panels. A sliding block one is fixedly connected to the side wall of the first door panel close to the protection housing. The sliding block one slides in the first control groove. A second spring is fixedly connected between the lower bottom surface of the sliding block one and the inner bottom surface of the first control groove. The upper end of the sliding block one is connected to the control assembly. A first sliding groove is arranged on the side wall of the first door panel close to the second door panel. An installation rod arranged in the up and down direction is fixedly connected in the first sliding groove. A sliding block two is slidably connected to the installation rod. A third spring is fixedly connected between the sliding block two and the inner top surface of the first sliding groove. The two sliding blocks two are respectively fixedly connected to the front and rear side walls of the second door panel.

[0010] Preferably, a set of second control grooves along the left and right direction are respectively arranged in the front and rear side walls of the protection housing. The left end of each second control groove is respectively communicated with a first control groove. An installation inclined surface is arranged at the connection of the first control groove and the second control groove. A rotating roller is installed on the installation inclined surface. The control assembly includes a control sleeve. The control sleeve is sleeved outside the protection housing. A sliding block three is respectively fixedly connected to the inner walls of the front and rear sides of the control sleeve. Each sliding block three slides in a second control groove. A fourth spring is fixedly connected between the right side wall of the sliding block three and the right inner wall of the second control groove. A transmission rope is fixedly connected to the left end of the sliding block three. The other end of the transmission rope bypasses the rotating roller and is fixedly connected to the sliding block one.

[0011] Preferably, it further includes a second auxiliary fixing component. The second auxiliary fixing component includes: an upper fixing member, a lower fixing member and a fifth spring. The upper fixing member and the lower fixing member are respectively arranged on the upper and lower sides of the optical cable main body. The two ends of the fifth spring are respectively fixedly connected to the upper fixing member and the lower fixing member. Two first control rods are fixedly connected to the lower surface of the upper fixing member. A first control inclined surface is arranged at the lower end of the first control rod. The first control rod penetrates through the lower fixing member and the lower side wall of the protection housing in the up and down direction. Two second control rods are fixedly connected to the upper surface of the lower fixing member. A second control inclined surface is arranged at the upper end of the second control rod. The second control rod penetrates through the upper fixing member and the upper side wall of the protection housing in the up and down direction.

[0012] Preferably, it further includes a sealing assembly, which includes an installation box body fixedly connected to the right inner wall of the protective housing. There is a first installation cavity and two second installation cavities in the installation box body. The two second installation cavities are respectively arranged on the upper and lower sides of the first installation cavity. The optical cable main body penetrates through the first installation cavity in the left-right direction. An annular sealing airbag is installed in the first installation cavity and surrounds the outside of the optical cable main body. A control airbag is arranged in each second installation cavity, and the control airbag is communicated with the sealing airbag. A set of transmission assemblies are respectively arranged on the right side walls of each first control rod and the second control rod. The transmission assembly includes a first transmission rod and a second transmission rod. One end of the first transmission rod is hinged to the right side wall of the first control rod or the second control rod, the other end of the first transmission rod is hinged to the second transmission rod, the second transmission rod slides through the side wall of the installation box body in the left-right direction, and the other end of the second transmission rod contacts the control airbag.

[0013] The present invention also discloses an optical cable preparation method, which is applied to the above-mentioned optical cable and includes: Step S1: Arrange the micro-strain fiber optic cable, the tight-buffered optical unit and the loose-tube optical unit in the core of the optical cable according to the design requirements to form a cable core; Step S2: Wind a PE inner sheath around the cable core, arrange a corrugated steel tape armor between the cable core and the PE inner sheath, cover a layer of PE outer sheath outside the PE inner sheath, arrange a corrugated steel tape armor between the PE inner sheath and the PE outer sheath, and use an optical cable forming machine to heat and press the cable core, the corrugated steel tape armor, the PE inner sheath and the PE outer sheath to form the optical cable main body; Step S3: Install an optical cable connector on the optical cable main body; Step S4: Install a protection component and a control component at the interface between the optical cable main body and the optical cable connector.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Through the settings of the protection component, the sealing component, the fixing component and the control component, the high-efficiency protection of the optical cable connector in harsh environments is realized. First of all, the protection component adopts a high-strength protective housing and combines the gate component and the auxiliary fixing structure, so that the optical cable can remain stable when subjected to external force impact, tension or vibration, improving the safety of the optical cable during transportation. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1It is a schematic structural diagram of the present invention; Figure 2 It is a schematic structural diagram of the gate assembly of the present invention; Figure 3 It is a schematic top view structural diagram of the present invention; Figure 4 It is Figure 3 The sectional view at A-A in Figure 5 It is Figure 3 The sectional view at B-B in Figure 6 It is Figure 5 The enlarged view at C in Figure 7 It is Figure 5 The sectional view at D-D in Figure 8 It is Figure 5 The sectional view at E-E in Figure 9 It is a schematic diagram of the main structure of the optical cable.

[0017] Reference numerals: 1. Optical cable main body; 2. Optical cable joint; 3. Protection housing; 4. Protection wall; 5. First spring; 6. Limiting plate; 7. Sealing block; 8. First control groove; 9. First door panel; 10. Second door panel; 11. First sliding block; 12. Second spring; 13. First sliding groove; 14. Mounting rod; 15. Second sliding block; 16. Third spring; 17. Second control groove; 18. Mounting inclined surface; 19. Rotating roller; 20. Control sleeve; 21. Third sliding block; 22. Fourth spring; 23. Transmission rope; 24. Upper fixing member; 25. Lower fixing member; 26. Fifth spring; 27. First control rod; 28. First control inclined surface; 29. Second control rod; 30. Second control inclined surface; 31. Mounting box body; 32. First installation cavity; 33. Second installation cavity; 34. Sealing airbag; 35. Control airbag; 36. First transmission rod; 37. Second transmission rod; 38. Microstrain fiber optic; 39. Tight jacket optical unit; 40. Loose tube optical unit; 41. Corrugated steel tape armor; 42. PE inner sheath; 43. PE outer sheath. Detailed implementation manners

[0018] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0019] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the meaning of order or sequence, nor are they used to limit the present invention. They are merely used to distinguish components or operations described with the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0020] Embodiment 1 An embodiment of the present invention provides an optical cable, including an optical cable main body 1 and an optical cable joint 2. The optical cable joint 2 is connected to one end of the optical cable main body 1, and a protective component is also sleeved at the connection between the optical cable joint 2 and the optical cable main body 1, and a control component is arranged outside the protective component; The optical cable main body 1 includes a micro-strain fiber optic 38, a tight-buffered optical unit 39, a loose-tube optical unit 40, a corrugated steel tape armor 41, a PE inner sheath 42, and a PE outer sheath 43; The micro-strain fiber optic 38 adopts a GFRP tight-buffered structure, is placed at the very center of the optical cable, has the shortest length, is very sensitive to strain, has high precision, and is used to monitor the tiny strain of the object to be measured; The tight-buffered optical unit 39 is a stress-sensing optical fiber, and its strain amount is larger than that of the central micro-strain sensing optical fiber, and is used to measure larger strain and displacement; The loose-tube optical unit 40 is used for vibration sensing and temperature sensing, and can also be used for communication. The loose-tube optical cables can be placed in different loose tubes according to functions; The tight-buffered optical unit 39 and the loose-tube optical unit 40 are symmetrically distributed with a large size interval, so that the interference arms generate different sensitivity signals, thereby improving the overall system sensitivity, and the M-Z vibration sensitivity is relatively high.

[0021] Preferably, the protective component includes a protective housing 3. One end of the protective housing 3 close to the optical cable main body 1 is fixedly connected with a protective wall 4, and a gate component is installed at the end of the protective housing 3 far from the optical cable main body 1.

[0022] Preferably, two groups of front and rear symmetric first auxiliary fixing components are further arranged on the inner wall of the protective housing 3. The first auxiliary fixing component includes a first spring 5. One end of the first spring 5 is fixedly connected to the inner wall of the protective housing 3, and the other end of the first spring 5 is fixedly connected with a limiting plate 6.

[0023] The beneficial effects of the above technical solutions are: During the transportation of the optical cable, the optical cable joint 2 is housed inside the protective housing 3. The isolation between the inside of the protective housing 3 and the external environment is achieved through the gate assembly. At the same time, the stability of the optical cable joint 2 inside the protective housing 3 is controlled by the limiting plate 6, avoiding damage during the transportation of the optical cable.

[0024] Embodiment 2 On the basis of Embodiment 1, the gate assembly includes two blocking blocks 7 symmetrically arranged front and back and two groups of door body assemblies sliding in the up and down direction. The blocking blocks 7 are fixedly connected to one end of the protective housing 3 away from the optical cable main body 1, and the two groups of door body assemblies are symmetrically arranged above and below the blocking blocks 7.

[0025] Preferably, a set of first control grooves 8 in the vertical direction are respectively arranged in the front and rear side walls on the side of the protective housing 3 away from the optical cable main body 1. The upper door body assembly includes two first door panels 9 and one second door panel 10. The two first door panels 9 are symmetrically arranged in front and back above the two blocking blocks 7 respectively. The front and rear side walls of the second door panel 10 are respectively slidably connected to the two first door panels 9. A sliding block one 11 is fixedly connected to the side wall of the first door panel 9 close to the protective housing 3. The sliding block one 11 slides in the first control groove 8. A spring two 12 is fixedly connected between the lower bottom surface of the sliding block one 11 and the inner bottom surface of the first control groove 8. The upper end of the sliding block one 11 is connected to the control assembly. A sliding groove one 13 is arranged on the side wall of the first door panel 9 close to the second door panel 10. An installation rod 14 arranged in the up and down direction is fixedly connected in the sliding groove one 13. A sliding block two 15 is slidably connected to the installation rod 14. A spring three 16 is fixedly connected between the sliding block two 15 and the inner top surface of the sliding groove one 13. The two sliding blocks two 15 are respectively fixedly connected to the front and rear side walls of the second door panel 10.

[0026] The beneficial effects of the above technical solutions are as follows: When the optical cable joint 2 is housed inside the protective housing 3, the first door panel 9 is in close contact with the blocking block 7, and the second door panels 10 of the two groups of gate assemblies on the upper and lower sides are in close contact with each other, ensuring the isolation of the gate assembly from the external environment and improving the safety during the transportation of the optical cable.

[0027] When the optical cable joint 2 is pulled out of the protective housing 3, the first door panel 9 is in close contact with the blocking block 7, and the second door panels 10 of the two groups of gate assemblies on the upper and lower sides are in close contact with the optical cable joint 2, also ensuring the isolation of the gate assembly from the external environment and improving the safety during the use of the optical cable.

[0028] When installing the optical cable, by pulling the control sleeve 20 to the right, the slider three 21 slides to the right. Through the pulling of the transmission rope 23, the slider two 15 moves away from the central axis direction of the optical cable body, thus completing the opening of the gate assembly. At this time, the staff manually pulls the optical cable to adjust the extended length of the optical cable. After the adjustment is completed, the staff only needs to stop pulling the control sleeve 20. Under the action of the second spring 12 and the third spring 16, the gate assembly can be automatically closed and the control sleeve 20 can be automatically reset, improving the convenience of using the optical cable.

[0029] Embodiment 3 On the basis of Embodiment 2, a set of second control grooves 17 in the left-right direction are respectively arranged in the front and rear side walls of the protection housing 3. The left end of each second control groove 17 is respectively communicated with a first control groove 8. An installation inclined surface 18 is arranged at the connection of the first control groove 8 and the second control groove 17. A rotating roller 19 is installed on the installation inclined surface 18. The control assembly includes a control sleeve 20. The control sleeve 20 is sleeved outside the protection housing 3. A slider three 21 is respectively fixedly connected to the inner walls of the front and rear sides of the control sleeve 20. Each slider three 21 slides in a second control groove 17. A spring four 22 is fixedly connected between the right side wall of the slider three 21 and the right inner wall of the second control groove 17. The left end of the slider three 21 is fixedly connected with a transmission rope 23. The other end of the transmission rope 23 is fixedly connected to the slider one 11 after passing around the rotating roller 19.

[0030] The beneficial effects of the above technical solutions are as follows: As the control sleeve 20 is pulled to the right, the control inclined surface one 28 and the control inclined surface two 30 are squeezed, so that the upper fixing member 24 and the lower fixing member 25 move away from each other, thereby realizing the loosening of the clamping of the optical cable main body 1, facilitating the pulling of the optical cable main body 1, and adjusting the extended length of the optical cable joint 2.

[0031] During the transportation or use of the optical cable, the upper fixing member 24 and the lower fixing member 25 approach each other under the action of the fifth spring 26, thereby realizing the clamping of the optical cable main body 1, ensuring the stability of the length of the optical cable main body 1 entering the protection housing 3 during the use or transportation of the optical cable, and preventing the optical cable main body 1 from moving back and forth in the protection housing 3, causing damage to the optical cable.

[0032] Embodiment 4 On the basis of Embodiment 3, it further includes a second auxiliary fixing component, and the second auxiliary fixing component includes: an upper fixing member 24, a lower fixing member 25, and a fifth spring 26. The upper fixing member 24 and the lower fixing member 25 are respectively arranged on the upper and lower sides of the optical cable main body 1. The two ends of the fifth spring 26 are respectively fixedly connected to the upper fixing member 24 and the lower fixing member 25. Two first control rods 27 are fixedly connected to the lower surface of the upper fixing member 24. A first control slope 28 is arranged at the lower end of the first control rod 27. The first control rod 27 penetrates through the lower fixing member 25 and the lower side wall of the protective housing 3 in the up and down direction. Two second control rods 29 are fixedly connected to the upper surface of the lower fixing member 25. A second control slope 30 is arranged at the upper end of the second control rod 29. The second control rod 29 penetrates through the upper fixing member 24 and the upper side wall of the protective housing 3 in the up and down direction.

[0033] Preferably, it further includes a sealing component, and the sealing component includes an installation box body 31. The installation box body 31 is fixedly connected to the right inner wall of the protective housing 3. A first installation cavity 32 and two second installation cavities 33 are arranged in the installation box body 31. The two second installation cavities 33 are respectively arranged on the upper and lower sides of the first installation cavity 32. The optical cable main body 1 penetrates through the first installation cavity 32 in the left and right direction. An annular sealing airbag 34 is installed in the first installation cavity 32. The sealing airbag 34 surrounds the outside of the optical cable main body 1. A control airbag 35 is arranged in each second installation cavity 33. The control airbag 35 is communicated with the sealing airbag 34. A set of transmission components are respectively arranged on the right side walls of each first control rod 27 and the second control rod 29. The transmission components include a first transmission rod 36 and a second transmission rod 37. One end of the first transmission rod 36 is hinged to the right side wall of the first control rod 27 or the second control rod 29. The other end of the first transmission rod 36 is hinged to the second transmission rod 37. The second transmission rod 37 slides through the side wall of the installation box body 31 in the left and right direction. The other end of the second transmission rod 37 is in contact with the control airbag 35.

[0034] The beneficial effects of the above technical solutions are as follows: When the upper fixing member 24 and the lower fixing member 25 move away from each other, the included angle between the first transmission rod 36 and the first control rod 27 or the second control rod 29 becomes smaller, so that the second transmission rod 37 moves in a direction away from the control airbag 35, so that the gas content inside the sealing airbag 34 decreases, which is convenient for the movement of the optical cable main body 1.

[0035] When the upper fixing member 24 and the lower fixing member 25 move closer to each other, under the driving action of the first transmission rod 36, the second transmission rod 37 moves in a direction close to the control airbag 35, so that the gas in the control airbag 35 enters the sealing airbag 34, thereby realizing the sealing of the protective housing 3, improving the sealing performance of the protective housing 3, ensuring that the optical cable joint 2 still maintains good sealing performance in high humidity, rain, dust and corrosive environments, preventing external pollutants from entering, and ensuring the stable transmission of optical signals.

[0036] Example 5 The embodiment of the present invention also provides a method for manufacturing an optical cable, including: Step S1: Arrange the micro-strain fiber optic cable 38, the tight-buffered optical unit 39, and the loose tube optical unit 40 at the core of the optical cable according to the design requirements to form a cable core; Step S2: Wind a PE inner sheath 42 around the cable core, arrange a corrugated steel tape armor 41 between the cable core and the PE inner sheath 42, cover a layer of PE outer sheath 43 outside the PE inner sheath 42, arrange a corrugated steel tape armor 41 between the PE inner sheath 42 and the PE outer sheath 43, and use an optical cable forming machine to heat and press the cable core, the corrugated steel tape armor 41, the PE inner sheath 42, and the PE outer sheath 43 to form an optical cable main body (1); Step S3: Install an optical cable joint 2 on the optical cable main body 1; Step S4: Install a protection component and a control component at the interface between the optical cable main body 1 and the optical cable joint 2.

[0037] The beneficial effects of the above technical solution are as follows: Through the scientific arrangement of optical fibers, the enhancement of the strengthening layer, and the optimized design of the protection component and the control component, the mechanical strength, sealing performance, weather resistance, and maintenance convenience of the optical cable are improved. First, during the optical fiber arrangement process, the cable core is reasonably arranged to ensure the stability of optical signal transmission and reduce signal loss caused by external stress on the optical fibers. Second, by winding a high-strength strengthening layer around the cable core and filling a low-density buffer material, the optical cable has stronger tensile, compressive, and bending resistance capabilities, and can adapt to long-distance laying and construction in harsh environments. The outer sheath material uses a high-molecular material with strong weather resistance, effectively improving the corrosion resistance, high and low temperature resistance, and waterproof performance of the optical cable, making it suitable for extreme application environments such as underground, marine, and strong earthquake areas. In addition, adding a protection component and a control component at the interface between the optical cable main body 1 and the optical cable joint 2 not only provides multiple sealing protections to prevent moisture, dust, and oil from invading, but also has an intelligent adjustment function, which can dynamically adjust the sealing state according to changes in the external environment to ensure long-term stable operation. Finally, the optical cable manufacturing method of the present invention optimizes the materials and structures, enabling the optical cable to have a longer service life, more stable transmission performance, while improving the installation and maintenance convenience, reducing the operation cost, and being applicable to various scenarios such as high-reliability optical communication, submarine communication, industrial applications, and laying in harsh environments.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical cable, characterized in that: The optical cable comprises an optical cable body (1) and an optical cable connector (2), wherein the optical cable connector (2) is connected to one end of the optical cable body (1), and a protective component is also provided at the connection between the optical cable connector (2) and the optical cable body (1), and a control component is provided outside the protective component; The optical cable body (1) comprises a micro-strain optical fiber (38), a tight-tube optical unit (39), a loose-tube optical unit (40), a corrugated steel belt armor (41), a PE inner sheath (42) and a PE outer sheath (43).

2. An optical cable according to claim 1, characterized in that: The protection component comprises a protection shell (3), one end of the protection shell (3) close to the optical cable body (1) is fixedly connected to a protection wall (4), and one end of the protection shell (3) away from the optical cable body (1) is installed with a gate component.

3. An optical cable according to claim 2, characterized in that: The inner wall of the protective shell (3) is also provided with two groups of front-to-back symmetrical first auxiliary fixing components, the first auxiliary fixing components comprising a spring (5), one end of the spring (5) being fixedly connected to the inner wall of the protective shell (3), and the other end of the spring (5) being fixedly connected to a limiting plate (6).

4. An optical cable according to claim 2, characterized in that: The gate assembly comprises two sealing blocks (7) symmetrically arranged front and rear and two groups of door body assemblies sliding in the up-down direction. The sealing block (7) is fixedly connected to one end of the protective shell (3) away from the optical cable body (1), and the two groups of door body assemblies are symmetrically arranged on the upper and lower sides of the sealing block (7).

5. An optical cable according to claim 4, characterized in that: A group of first control grooves (8) along the vertical direction are respectively arranged in the front and rear side walls of the protective shell (3) away from the optical cable body (1), and the upper door body assembly includes two first door panels (9) and a second door panel (10), the two first door panels (9) are symmetrically arranged above the two blocking blocks (7), the front and rear side walls of the second door panel (10) are respectively slidably connected to the two first door panels (9), and a sliding block (11) is fixedly connected to the side wall of the first door panel (9) close to the protective shell (3), and the sliding block (11) slides in the first control groove (8). The sliding block (11) 1) A spring 2 (12) is fixedly connected between the lower bottom surface and the inner bottom surface of the first control groove (8), the upper end of the sliding block 1 (11) is connected to the control component, a sliding groove 1 (13) is arranged on the side wall of the first door panel (9) close to the second door panel (10), a mounting rod (14) arranged in the up and down directions is fixedly connected in the sliding groove 1 (13), a sliding block 2 (15) is slidably connected on the mounting rod (14), a spring 3 (16) is fixedly connected between the sliding block 2 (15) and the inner top surface of the sliding groove 1 (13), and the two sliding blocks 2 (15) are respectively fixedly connected to the front and rear side walls of the second door panel (10).

6. An optical cable according to claim 4, characterized in that: A group of second control grooves (17) along the left and right directions are respectively arranged in the front and rear side walls of the protection shell (3), the left end of each second control groove (17) is respectively communicated with a first control groove (8), a mounting inclined surface (18) is arranged at the connection between the first control groove (8) and the second control groove (17), a rotating roller (19) is mounted on the mounting inclined surface (18), and the control component comprises a control sleeve (20), the control sleeve (20) is sleeved on the outer side of the protection shell (3), a sliding block three (21) is respectively fixedly connected to the front and rear side inner walls of the control sleeve (20), each sliding block three (21) slides in a second control groove (17), a spring four (22) is fixedly connected between the right side wall of the sliding block three (21) and the right side inner wall of the second control groove (17), a transmission rope (23) is fixedly connected to the left end of the sliding block three (21), and the other end of the transmission rope (23) is fixedly connected to the sliding block one (11) after passing around the rotating roller (19).

7. An optical cable according to claim 4, characterized in that: The optical cable body (1) further comprises a second auxiliary fixing assembly, which comprises: an upper fixing member (24), a lower fixing member (25) and a spring five (26). The upper fixing member (24) and the lower fixing member (25) are respectively arranged on the upper and lower sides of the optical cable body (1). The two ends of the spring five (26) are respectively fixedly connected to the upper fixing member (24) and the lower fixing member (25). Two first control rods (27) are fixedly connected to the lower surface of the upper fixing member (24). A control inclined plane one (28) is arranged at the lower end of the first control rod (27). The first control rod (27) passes through the lower fixing member (25) and the lower side wall of the protective shell (3) in the vertical direction. Two second control rods (29) are fixedly connected to the upper surface of the lower fixing member (25). A control inclined plane two (30) is arranged at the upper end of the second control rod (29). The second control rod (29) passes through the upper fixing member (24) and the upper side wall of the protective shell (3) in the vertical direction.

8. An optical cable according to claim 7, characterized in that: The optical cable body (1) further comprises a sealing assembly, which comprises an installation box (31), the installation box (31) being fixedly connected to the right inner wall of the protective shell (3), a first installation cavity (32) and two second installation cavities (33) being arranged in the installation box (31), the two second installation cavities (33) being arranged at the upper and lower sides of the first installation cavity (32), the optical cable body (1) passing through the first installation cavity (32) in the left-right direction, an annular sealing airbag (34) being arranged in the first installation cavity (32), the sealing airbag (34) surrounding the outer side of the optical cable body (1), and a control airbag (34) being arranged in each second installation cavity (33). The airbag (35) is connected to the control airbag (35) and the sealing airbag (34). The right side wall of each first control rod (27) and the second control rod (29) is also provided with a group of transmission components, the transmission components including a transmission rod 1 (36) and a transmission rod 2 (37). One end of the transmission rod 1 (36) is hinged on the right side wall of the first control rod (27) or the second control rod (29), and the other end of the transmission rod 1 (36) is hinged with the transmission rod 2 (37). The transmission rod 2 (37) slides in the left and right directions and penetrates the side wall of the installation box (31). The other end of the transmission rod 2 (37) contacts with the control airbag (35).

9. A method for preparing an optical cable, applied to an optical cable as claimed in any one of claims 1 to 8, characterized in that: include: Step S1: arranging the micro-strain optical fiber (38), the tight-tube optical unit (39) and the loose-tube optical unit (40) at the core of the optical cable according to design requirements to form a cable core; Step S2: wrapping a PE inner sheath (42) around the cable core, arranging a corrugated steel belt armor (41) between the cable core and the PE inner sheath (42), covering the outside of the PE inner sheath (42) with a layer of PE outer sheath (43), arranging a corrugated steel belt armor (41) between the PE inner sheath (42) and the PE outer sheath (43), and using an optical cable forming machine to heat and press the cable core, the corrugated steel belt armor (41), the PE inner sheath (42) and the PE outer sheath (43) to form an optical cable body (1); Step S3: installing an optical cable connector (2) on the optical cable body (1); Step S4: installing a protection component and a control component at the interface between the optical cable body (1) and the optical cable connector (2).

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