An anti-seismic optical cable and a preparation method, construction method and maintenance method thereof

Abstract

The application discloses an anti-seismic optical cable and a preparation method, construction method and maintenance method thereof, and belongs to the technical field of optical cable preparation, and comprises a magnetic attraction unit, the magnetic attraction unit comprises a light unit and a magnetic sleeve wrapped outside the light unit, and the outer end of the magnetic sleeve is bonded with a magnetic attraction piece; a magnetic inner sheath is wrapped outside the magnetic attraction unit, and an annular gap is formed between the magnetic inner sheath and the magnetic attraction unit, and the magnetic attraction force between the magnetic attraction piece and the magnetic inner sheath is equal to the gravity of the magnetic attraction unit; and an outer sheath is wrapped outside the outer periphery of the magnetic inner sheath. The anti-seismic optical cable in the application offsets the gravity of the magnetic attraction unit through the magnetic force between the magnetic attraction piece and the magnetic inner sheath, and generates a circumferentially uniform magnetic attraction force on the magnetic attraction unit by the magnetic inner sheath, so that the magnetic attraction unit is in a floating state without force, external vibration is avoided from being conducted to the light unit, and the problem of internal optical fiber breakage is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of optical cable preparation, and particularly relates to an anti-vibration optical cable and a preparation method thereof. BACKGROUND

[0002] High-speed rail optical cable refers to an optical cable laid in a cable channel outside a pre-set track of a high-speed railway. When the speed of a high-speed railway is too fast, the safety performance is required to be high, railway communication is required to realize full coverage without blind area, and the high-speed rail optical cable laying is required to implement a 'double cable parallel' design standard, that is, one optical cable is laid on each side of the track to respectively carry main and standby channels of train operation business to overcome the risk of communication interruption caused by external environment. If inspection is not in place and problems are not completely solved, once the optical cable is interrupted, passengers will not be able to swipe tickets to enter the station and take the train, and high-speed rail drivers will not be able to receive dispatching commands and path forecasts, which will eventually lead to large area delay or stop of high-speed rail.

[0003] The existing high-speed rail optical cable will vibrate the optical cable for years during the running of the train, causing the micro-cracks in the optical fiber to continuously expand, and eventually causing fiber breakage and communication interruption. The vibration of the optical cable caused by the operation of the railway line is basically unavoidable, and in a long-term high-vibration environment, fiber breakage is an inevitable problem, which can only be solved by emergency repair and regular maintenance and replacement. SUMMARY

[0004] In view of one or more of the above defects or improvement needs of the prior art, the application provides an anti-vibration optical cable to solve the problem of internal optical fiber breakage of the existing optical cable in a long-term vibration environment.

[0005] To achieve the above purpose, the application provides an anti-vibration optical cable, which comprises:

[0006] A magnetic attraction unit, the magnetic attraction unit comprises at least one light unit, the light unit is provided with a magnetic sleeve outside the periphery, and a magnetic attraction piece is bonded to the vertical top end of the magnetic sleeve;

[0007] A magnetic inner sheath, the magnetic inner sheath is provided outside the periphery of the magnetic attraction unit, and an annular gap is formed between the magnetic inner sheath and the magnetic attraction unit, and the magnetic attraction force between the magnetic attraction piece and the magnetic inner sheath is equal to the gravity of the magnetic attraction unit;

[0008] An outer sheath, the outer sheath is wrapped outside the periphery of the magnetic inner sheath.

[0009] As a further improvement of the application, the magnetic attraction force of the magnetic inner sheath is generated by energization.

[0010] As a further improvement of the present application, the axial center of the magnetic attraction piece, the axial center of the magnetic attraction unit and the gravity center of the magnetic attraction unit vertically coincide, and the gravity center of the magnetic attraction unit is located below the axial center of the magnetic attraction unit.

[0011] As a further improvement of the present application, the light unit is multiple, and the first buffer layer is filled between the multiple light units and the magnetic sleeve.

[0012] As a further improvement of the present application, the water-blocking powder is further filled between the annular gap formed by the magnetic inner sheath and the magnetic sleeve, and the water-blocking powder partially fills the space of the annular gap.

[0013] As a further improvement of the present application, the armor layer is further arranged between the magnetic inner sheath and the outer sheath, and at least one opening cable is arranged between the armor layer and the outer sheath.

[0014] The present application also includes a preparation method of the anti-seismic optical cable, which comprises the following steps:

[0015] S1, providing a light unit;

[0016] S2, extruding a magnetic sleeve on the outer periphery of the light unit, synchronously extruding a magnetic attraction piece on the top end of the magnetic sleeve to form a magnetic attraction unit;

[0017] S3, forming a magnetic inner sheath by a vacuum sizing method;

[0018] S4, sleeving the magnetic attraction unit into the magnetic inner sheath, and extruding an outer sheath on the outside of the magnetic inner sheath.

[0019] As a further improvement of the present application, the step S3 specifically comprises:

[0020] The inner sheath is formed by a vacuum sizing method, and the inner sheath is cooled and formed, a steel belt is wrapped on the outer periphery of the inner sheath, and a coil is wound on the outer periphery of the steel belt to obtain the magnetic inner sheath.

[0021] As a further improvement of the present application, the step S2 specifically comprises:

[0022] The multiple light units are arranged in an array form, a counterweight rod is placed below the array center formed by the multiple light units, a magnetic sleeve is extruded on the outer periphery of the light unit and the counterweight rod, and a magnetic attraction piece is synchronously extruded on the top end of the magnetic sleeve.

[0023] As a further improvement of the present application, the forming raw material of the magnetic sleeve comprises the following components: neodymium iron boron magnetic powder 60wt%-70wt%, nylon 29wt%-37wt% and polyethylene glycol 1wt%-3wt%.

[0024] As a further improvement of the present application, the step S4 further comprises:

[0025] An FRP rod is attached to the outer periphery of the magnetic inner sheath to form an armor layer, and a cable opening rope is placed outside the armor layer.

[0026] The application also includes a construction method of the anti-seismic optical cable, comprising the following steps:

[0027] The anti-seismic optical cable is placed in the channel, the magnetic inner sheath is powered and magnetized, the voltage or current intensity of the magnetic inner sheath is adjusted so that the magnetic attraction force between the magnetic attraction piece and the magnetic inner sheath is equal to the gravity of the magnetic attraction unit, and the magnetic attraction unit is in a floating state in the magnetic inner sheath.

[0028] The application also includes a maintenance method of the anti-seismic optical cable:

[0029] The power supply of the magnetic inner sheath is disconnected, the magnetic inner sheath is powered again, and the voltage or current intensity of the magnetic inner sheath is adjusted so that the magnetic attraction force between the magnetic attraction piece and the magnetic inner sheath is equal to the gravity of the magnetic attraction unit, and the magnetic attraction unit is in a floating state in the magnetic inner sheath.

[0030] The application also includes an anti-seismic optical cable, comprising:

[0031] A magnetic attraction unit, comprising at least one optical unit, the optical unit is surrounded by a magnetic sleeve;

[0032] A magnetic inner sheath, which is surrounded by the magnetic attraction unit, and an annular gap is formed between the magnetic inner sheath and the magnetic attraction unit; a magnetic attraction piece is attached to the inner side of the magnetic inner sheath, which is located directly above the axial center of the magnetic attraction unit, and the magnetic attraction force between the magnetic attraction piece and the magnetic attraction unit is equal to the gravity of the magnetic attraction unit;

[0033] An outer sheath, which is wrapped around the outer periphery of the magnetic inner sheath.

[0034] The above technical features can be combined with each other as long as they do not conflict with each other.

[0035] Overall, the above technical solutions conceived by the present application have the following beneficial effects compared with the prior art:

[0036] (1) The anti-seismic optical cable of the present application, by arranging a magnetic sleeve and a magnetic inner sheath outside the optical unit, and utilizing the annular gap between the magnetic inner sheath and the magnetic suction unit, the magnetic inner sheath exerts a circumferentially uniform magnetic force on the magnetic suction unit, and the magnetic force between the magnetic suction piece and the magnetic inner sheath counteracts the gravity of the magnetic suction unit, realizing the floating of the magnetic suction unit in the magnetic inner sheath, and the circumferentially uniform magnetic suction force of the magnetic suction unit avoids the transmission of external vibration to the optical unit, so that the internal optical unit will not be broken due to external vibration environment, greatly improving the service life.

[0037] (2) The anti-seismic optical cable of the present application, by generating the magnetic force inside the magnetic inner sheath through power supply, the magnetic suction force of the magnetic inner sheath on the magnetic suction unit can be changed by adjusting the current, and the application moves the center of gravity of the magnetic suction unit below the axial center of the magnetic suction unit, so that the magnetic suction unit forms a form similar to a tumbler. When the magnetic force of the magnetic inner sheath disappears by power-off, the magnetic suction unit is located below the magnetic inner sheath, and due to the tumbler structure of the magnetic suction unit, it returns to the position where the magnetic suction piece is located at the vertical top end. The magnetic inner sheath is powered again to adjust the magnetic force, realizing the floating of the magnetic suction unit in the magnetic inner sheath, correcting the deviation of the original anti-seismic optical cable after vibration or impact and adhering to the magnetic inner sheath, avoiding the problem of external vibration transmitted to the optical unit, and greatly improving the service life of the anti-seismic optical cable in the vibration environment.

[0038] (3) The construction method and maintenance method of the anti-seismic optical cable of the present application, by on-site power supply construction adjustment, the magnetic suction force of the magnetic inner sheath on the magnetic suction unit is adjusted, so that after the anti-seismic optical cable is placed in place, the magnetic force of the magnetic inner sheath and the magnetic suction piece is counteracted, and the magnetic suction unit is in a floating state under the condition of circumferentially uniform magnetic force; at the same time, when the magnetic suction unit deviates under the condition of external impact or vibration, by power-off and the characteristics of the tumbler of the magnetic suction unit, the magnetic suction piece returns to the position of the vertical top end of the magnetic suction unit, and then the magnetic inner sheath is powered again, the magnetic inner sheath generates magnetic force again to make the magnetic suction unit float, completing the floating of the optical unit, avoiding the direct conduction of external vibration to the optical unit. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is the overall structure schematic diagram of the anti-seismic optical cable in the embodiment of the present application.

[0040] In all the drawings, the same reference signs represent the same technical features, specifically:

[0041] 1, optical unit; 2, first buffer layer; 3, magnetic sleeve; 4, magnetic suction piece; 5, magnetic inner sheath; 6, armored layer; 7, cable opening rope; 8, outer sheath. DETAILED DESCRIPTION

[0042] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present application and not to limit the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0043] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0045] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0047] Embodiment:

[0048] Please refer to Figure 1 The anti-vibration optical cable in the preferred embodiment of the present application comprises a magnetic suction unit, which comprises at least one optical unit 1, is sleeved with a magnetic sleeve 3 outside the optical unit 1, and is bonded with a magnetic suction piece 4 at the vertical top end of the magnetic sleeve 3; a magnetic inner sheath 5 is sleeved outside the magnetic suction unit, and an annular gap is formed between the magnetic inner sheath 5 and the magnetic suction unit, and the magnetic attraction force between the magnetic suction piece 4 and the magnetic inner sheath 5 is equal to the gravity of the magnetic suction unit; an outer sheath 8 is further provided outside the magnetic inner sheath 5, and the outer sheath 8 is used to protect the magnetic inner sheath 5 inside, so as to avoid the abrasion or external environment damage of the magnetic inner sheath 5, thereby reducing the magnetic force.

[0049] The anti-vibration optical cable in the present application is provided with a magnetic suction unit and a magnetic inner sheath 5 inside the optical cable, the magnetic inner sheath 5 applies a circumferentially uniform magnetic attraction force outside the magnetic suction unit, and the magnetic suction piece 4 and the magnetic inner sheath 5 overcome the gravity of the magnetic suction unit through the magnetic attraction force, so that the magnetic suction unit forms a floating state inside the magnetic inner sheath 5, thereby avoiding the transmission of vibration outside the outer sheath 8 to the magnetic suction unit, and solving the problem that the external vibration is transmitted to the optical fiber to cause the fiber breakage in the existing vibration environment such as high-speed rail.

[0050] Further, as the preferred embodiment of the present application, the magnetic attraction force of the magnetic inner sheath 5 in the present application is generated by electrification. When the magnetic suction unit is in a dynamic balance state with the magnetic inner sheath 5, the magnetic suction unit is in a floating state inside the magnetic inner sheath 5, but when the whole anti-vibration optical cable is moved, installed, constructed or vibrated, due to the floating of the magnetic suction unit itself, the magnetic suction unit deviates from the magnetic inner sheath 5, and the magnetic suction unit itself does not have the ability to automatically return to the center of the magnetic inner sheath 5. Therefore, the present application generates the magnetic attraction force of the magnetic inner sheath 5 by electrification, so that when the position of the magnetic suction unit deviates, the magnetic suction unit is again in a floating state by adjusting the magnetic attraction force of the magnetic inner sheath 5.

[0051] Further, as a preferred embodiment of the present application, the magnetic attraction piece 4, the axial center of the magnetic attraction unit and the gravity center of the magnetic attraction unit in the present application are vertically coincident, and the gravity center of the magnetic attraction unit is located below the axial center of the magnetic attraction unit. Since the anti-seismic optical cable in the present application overcomes the gravity of the magnetic attraction unit itself by the magnetic attraction force between the magnetic attraction unit and the magnetic inner sheath 5, the magnetic attraction unit itself is in a disordered state inside the magnetic inner sheath 5, and when the magnetic attraction piece 4 rotates or deviates during use of the anti-seismic optical cable, the magnetic attraction unit itself does not have the ability to return to the state that the magnetic attraction piece 4 is located at the vertical top end of the magnetic attraction unit, so that the anti-seismic optical cable itself does not have the ability to adjust, which is not conducive to the long-term use and maintenance of the anti-seismic optical cable. Therefore, the magnetic attraction unit is arranged in the form of a "Topsy-Turvy" in the present application, when the magnetic attraction unit deviates inside the magnetic inner sheath 5, the magnetic inner sheath 5 is powered off, the magnetic attraction unit falls under the action of gravity, the characteristics of the "Topsy-Turvy" make the magnetic attraction piece 4 adjust to the vertical top end of the magnetic attraction unit, and then the magnetic inner sheath 5 is powered on again to realize the floating of the magnetic attraction unit again. It is worth noting that when it is necessary to adjust the position of the magnetic attraction unit, the magnetic inner sheath 5 does not need to be completely powered off, but the power supply voltage or current can be appropriately reduced, so that the magnetic force between the magnetic inner sheath 5 and the magnetic attraction unit is less than the gravity of the magnetic attraction unit, the magnetic attraction unit falls after the gravity, and then the magnetic attraction unit adjusts the position of the magnetic attraction unit according to its gravity center, so that the magnetic attraction piece returns to the vertical top end of the magnetic attraction unit, and then the magnetic force of the magnetic inner sheath 5 is adjusted again to realize the floating of the magnetic attraction unit again.

[0052] Further, as a preferred embodiment of the present application, the optical unit 1 in the present application is multiple, and the first buffer layer 2 is filled between the multiple optical units 1 and the magnetic sleeve 3. Although the optical unit 1 can be directly sleeved with the magnetic sleeve 3, that is, the optical unit 1 is wrapped by the magnetic sleeve 3, the magnetic material part between the magnetic sleeve 3 and the optical unit 1 is an irregular structure, so that the magnetic attraction force applied by the magnetic inner sheath 5 to the magnetic attraction unit is uneven, which easily leads to uneven stress of the magnetic attraction unit inside the magnetic inner sheath 5, and therefore the first buffer layer 2 needs to be arranged between the optical unit 1 and the magnetic sleeve 3. The first buffer layer 2 preferably adopts foamed polyethylene, which can first absorb part of the external buffer, and secondly form a regular cylindrical structure with the optical unit 1, so that the magnetic sleeve 3 wrapped therearound is in a regular cylindrical structure, and the magnetic inner sheath 5 applies a circumferentially uniform magnetic attraction to the magnetic sleeve 3.

[0053] Specifically, as the specific structure of the magnetic attraction unit in the embodiment of the present application, the light units 1 in the present application are arranged in an array, a counterweight rod is arranged below the center of the array of the light units 1, a first buffer layer 2 is extruded around the light units 1 and the counterweight rod, and a magnetic sleeve 3 is extruded around the first buffer layer 2. Further, when the light units 1 are arranged in a square or rectangular array, the counterweight rod is located below the array; when the light units are arranged in a ring array, the counterweight rod is located below the center of the ring array.

[0054] Further, the annular gap between the magnetic inner sheath 5 and the magnetic sleeve 3 in the present application is also filled with water-blocking powder, which is mainly used to improve the water-blocking performance of the anti-seismic optical cable. It is worth noting that the content of the water-blocking powder in the present application is relatively small, which basically does not affect the weight of the magnetic attraction unit, and since the magnetic attraction force of the magnetic inner sheath 5 is generated by electrification, even if the water-blocking powder adheres to the circumferential surface of the magnetic attraction unit, the magnetic attraction force of the magnetic inner sheath 5 can be adjusted to make the magnetic attraction unit float in the air. Preferably, when the magnetic attraction force between the magnetic inner sheath 5 and the magnetic sleeve 3 is not easy to control, the content of the water-blocking powder can be appropriately increased, the water-blocking powder is deposited at the bottom of the magnetic inner sheath 5 and supports the magnetic attraction unit, forming a structure in which the magnetic attraction unit is supported by the water-blocking powder and the external conductive vibration, which can also greatly reduce the damage of external vibration to the optical fiber.

[0055] Further, as a preferred embodiment of the present application, the magnetic inner sheath 5 and the outer sheath 8 in the present application are further provided with an armor layer 6, and at least one cable opening rope 7 is further provided between the armor layer 6 and the outer sheath 8. The armor layer 6 is mainly used to form a protective structure outside the magnetic inner sheath 5 to avoid direct crushing of the magnetic inner sheath 5 by external impact, which can cause deformation of the magnetic inner sheath 5, and further cause the magnetic attraction force of the magnetic inner sheath 5 to the magnetic attraction unit to be unbalanced, resulting in the magnetic attraction unit directly adhering to the inner wall of the magnetic inner sheath 5. The cable opening rope 7 is a conventional structure of the optical cable, which mainly facilitates the construction personnel to strip the optical cable.

[0056] Further, in order to avoid the external vibration and impact from being transmitted to the magnetic inner sheath 5 to cause the magnetic inner sheath 5 to deviate, a second buffer layer is further provided between the magnetic inner sheath 5 and the armor layer 6. When the anti-seismic optical cable is used for signal transmission along the high-speed rail, the vibration brought by the train is mainly vertical vibration, and the vibration amplitude is very small. Under normal circumstances, the second buffer layer can directly avoid the transmission of vibration to the magnetic inner sheath 5, and the magnetic attraction unit is in a floating state and is not affected by external vibration. The main design purpose of the anti-seismic optical cable is to avoid the transmission of vibration to the magnetic attraction unit. When the anti-seismic optical cable is subjected to external impact, the position of the magnetic attraction unit and the magnetic inner sheath 5 deviates, and the magnetic attraction unit cannot return to the floating state, so it is necessary to adjust the magnetic force of the magnetic inner sheath 5 to the magnetic attraction unit to realize the floating of the magnetic attraction unit again.

[0057] The anti-seismic optical cable comprises an optical unit 1, a magnetic sleeve 3, a magnetic inner sheath 5, a magnetic attraction piece 4 and an outer sheath 8.

[0058] S1, providing the optical unit 1;

[0059] S2, extruding the magnetic sleeve 3 on the outer periphery of the optical unit 1, and synchronously extruding the magnetic attraction piece 4 outside the magnetic sleeve 3 to form a magnetic attraction unit;

[0060] The preparation of the magnetic sleeve 3 and the magnetic attraction piece 4 is the same as the extrusion preparation process of the conventional sleeve or sheath, that is, two extrusion heads are arranged on the extruder to respectively extrude the raw material of the magnetic sleeve 3 and the raw material of the magnetic attraction piece 4.

[0061] S3, forming the magnetic inner sheath 5 by using a vacuum sizing method;

[0062] S4, arranging the magnetic attraction piece 4 upwards, sleeving the magnetic attraction unit into the magnetic inner sheath 5, and extruding the outer sheath 8 outside the magnetic inner sheath 5.

[0063] Further, the optical unit 1 in the above step S1 can be prepared by itself or purchased.

[0064] Further, the above step S3 specifically comprises: forming an inner sheath by using a vacuum sizing method, cooling and forming the inner sheath, wrapping a steel belt on the outer periphery of the inner sheath, and winding a coil on the outer periphery of the steel belt to obtain the magnetic inner sheath 5.

[0065] Specifically, the raw material of the magnetic sleeve 3 in step S2 comprises the following components: neodymium iron boron magnetic powder 60wt%-70wt%, nylon 29wt%-37wt% and polyethylene glycol 1wt%-3wt%. Preferably, the particle size distribution of the above neodymium iron boron magnetic powder is 40-360 mesh, the polyethylene glycol acts as a plasticizer, facilitates the injection molding of the magnetic sleeve 3, and improves the dispersibility of the neodymium iron boron magnetic powder. Meanwhile, the neodymium iron boron magnetic powder needs to be subjected to high-temperature demagnetization treatment before injection extrusion to avoid the agglomeration of the magnetic powder in the extrusion process due to magnetic attraction. After the magnetic sleeve 3 is cooled and shaped in the cooling water tank, the magnetic powder in the magnetic sleeve 3 can also be magnetized to make the sleeve have magnetism.

[0066] Further, the raw material of the magnetic attraction piece 4 comprises the following components: neodymium iron boron magnetic powder 80wt%, nylon 17wt% and polyethylene glycol 3wt%. It is worth noting that the magnetic attraction force between the magnetic attraction piece 4 and the magnetic inner sheath 5 is used to overcome the gravity of the magnetic attraction unit, and the content of the neodymium iron boron magnetic powder in the magnetic attraction piece 4 is higher, so that the magnetic attraction piece 4 and the magnetic inner sheath 5 have stronger magnetic force.

[0067] Further, in order to ensure that the magnetic inner sheath 5 exerts a circumferentially uniform magnetic attraction force on the magnetic attraction unit, the magnetic inner sheath 5 has a relatively regular annular structure. To this end, the main body part of the magnetic inner sheath 5 is obtained by vacuum sizing. Since the magnetic inner sheath 5 generates a magnetic force by being energized, coils need to be uniformly wound around the outer periphery of the main body part, and finally, the main body part is cooled and formed, and a steel belt is wrapped around the outer periphery to obtain the magnetic inner sheath 5.

[0068] Further, as a preferred embodiment of the present application, the magnetic attraction unit in the present application needs to have the characteristics of a "Tumbler". In order to make the center of gravity of the magnetic attraction unit located below the center of the magnetic sleeve 3, a counterweight rod needs to be added during the extrusion process. Specifically, a plurality of light units 1 are arranged in an array, a counterweight rod is placed below the center of the array formed by the plurality of light units 1, and then the magnetic sleeve 3 is extruded around the outer periphery of the light units 1 and the counterweight rod. Finally, the magnetic attraction piece 4 is synchronously extruded at the outer end of the magnetic sleeve 3.

[0069] The above-mentioned light units 1 are arranged in an array, and after the plurality of light units 1 are arranged by the traction mechanism, they can be synchronously pulled.

[0070] Further, in order to ensure uniform distribution of the magnetic powder in the magnetic attraction unit, a first buffer layer 2 needs to be filled around the outer periphery of the light units 1 and the counterweight rod, a regular cylindrical structure is formed by the first buffer layer 2, and then the magnetic sleeve 3 is extruded around the outer periphery of the first buffer layer 2. When the magnetic powder in the magnetic sleeve 3 is uniformly distributed, the magnetic inner sheath 5 exerts a circumferentially uniform magnetic attraction force on the magnetic attraction unit.

[0071] Further, in order to make the magnetic attraction piece 4 and the magnetic inner sheath 5 cooperate to generate a magnetic attraction force to overcome the gravity of the magnetic attraction unit. In the above step S4, when the magnetic attraction unit is sleeved into the magnetic inner sheath 5, the magnetic attraction piece needs to be vertically upward and sleeved into the inside of the magnetic inner sheath 5. At the same time, in order to avoid the interaction of the magnetic inner sheath 5, the magnetic sleeve 3 and the magnetic attraction piece 4 affecting the assembly of the magnetic unit and the magnetic inner sheath 5, the magnetic sleeve 3 and the magnetic attraction piece 4 themselves can not have a magnetic attraction force. When the magnetic inner sheath 5 is charged, the magnetic inner sheath 5 can generate a magnetic attraction force on the magnetic sleeve 3 and the magnetic attraction piece 4, respectively.

[0072] Preferably, in order to facilitate the construction and arrangement of the anti-seismic optical cable, color bands need to be marked on the outer periphery of the outer sheath 8 when the outer sheath 8 is extruded. The color bands correspond to the positions of the magnetic attraction pieces 4, so that when the color bands are vertically upward, it means that the magnetic attraction pieces 4 are vertically upward.

[0073] Further, as a preferred embodiment of the present application, when the outer sheath 8 is extruded outside the magnetic inner sheath 5, a sheath layer 6 can also be arranged on the outer periphery of the magnetic inner sheath 5, and the sheath layer 6 is preferably arranged by FRP rods to form a sheath protection on the outer periphery of the magnetic inner sheath 5. After the sheath layer 6 is formed, the cable stripping 7 can be placed on the outer periphery of the sheath layer 6 for subsequent stripping of the outer sheath 8. Further optionally, a second buffer layer can be extruded on the outer periphery of the sheath layer 6 to avoid the influence of external vibration on the position and shape of the magnetic inner sheath 5.

[0074] For the anti-vibration optical cable prepared above, the anti-vibration performance thereof is tested, specifically as follows:

[0075] Example 1: Four optical units 1 are selected, and an FRP rod is used as a counterweight rod. The optical units 1 and the counterweight rod are wrapped with extruded foamed polyethylene on the outer periphery, and a magnetic sleeve 3 is extruded on the outer periphery of the foamed polyethylene. The outer diameter of the magnetic sleeve 3 is 8 mm, and the thickness is 1 mm. A magnetic attraction piece 4 is extruded on the outer periphery of the magnetic sleeve 3. The specific components of the magnetic sleeve 3 are neodymium iron boron magnetic powder 60wt%, nylon 37wt% and polyethylene glycol 3wt%. A magnetic inner sheath 5 with an inner diameter of 12 mm and a thickness of 3 mm is sleeved on the outer periphery of the magnetic sleeve 3. An FRP rod is added as a sheath layer 6 on the outer periphery of the magnetic inner sheath 5. An outer sheath 8 is extruded and formed on the outer periphery of the sheath layer 6 to obtain an optical cable 1.

[0076] Example 2: The preparation conditions are the same as those of Example 1, except that the components of the magnetic sleeve are different, neodymium iron boron magnetic powder 65wt%, nylon 33wt% and polyethylene glycol 2wt%, to obtain an optical cable 2.

[0077] Example 3: The preparation conditions are the same as those of Example 1, except that the components of the magnetic sleeve are different, neodymium iron boron magnetic powder 70wt%, nylon 29wt% and polyethylene glycol 1wt%, to obtain an optical cable 3.

[0078] Example 4: The preparation conditions are the same as those of Example 1, except that the magnetic sleeve is made of nylon to obtain an optical cable 4.

[0079] According to IEC60794-1-2:2003 E19, the magnetic inner sheath of the optical cable in Examples 1-3 is powered and the magnetic attraction piece is upward. The voltage and current applied are based on the magnetic sleeve 3 that can float in the air. The optical cable is vibrated at a frequency of 50HZ, with an amplitude of ±2mm, and the vibration time is 720h. After the test, the attenuation change of the optical fiber before and after the test is measured.

[0080]

[0081] Through the above test, it can be seen that the optical cable in the above embodiments 1~3 has an attenuation change value within 0.05dB before and after the test, has no obvious additional attenuation, and the communication function is good; and the optical cable in the vibration part is dissected, and the fiber core layer of the optical fiber is observed under a microscope, and no obvious microcracks are found, proving that the anti-seismic optical cable in the application has excellent anti-seismic performance.

[0082] Further, for the anti-seismic optical cable in the application, the application also includes a construction method of the anti-seismic optical cable, specifically including the following steps:

[0083] The anti-seismic optical cable is placed in the groove, and the anti-seismic optical cable is rotated along the cable axis, so that the magnetic attraction piece 4 is vertically upward; the coil of the magnetic inner sheath 5 is powered, the coil generates a magnetic field, the voltage or current intensity of the coil is adjusted, so that the magnetic attraction force between the magnetic attraction piece 4 and the magnetic inner sheath 5 is equal to the gravity of the magnetic attraction unit, and the magnetic attraction unit is in a floating state in the magnetic inner sheath 5.

[0084] Correspondingly, the application also includes a maintenance method of the anti-seismic optical cable, which includes the following steps:

[0085] The power supply of the magnetic inner sheath 5 is disconnected, the magnetic inner sheath 5 is powered again, and the voltage or current intensity of the magnetic inner sheath 5 is adjusted, so that the magnetic attraction force between the magnetic attraction piece 4 and the magnetic inner sheath 5 is equal to the gravity of the magnetic attraction unit, and the magnetic attraction unit is in a floating state in the magnetic inner sheath 5.

[0086] It is worth noting that in order to avoid the above anti-seismic optical cable from rotating or position deviation in the use process, a clamp or a placing groove can be used to preliminarily fix the anti-seismic optical cable.

[0087] As an optional embodiment of the application, the application also includes an anti-seismic optical cable, which includes:

[0088] A magnetic attraction unit, which includes at least one optical unit 1, and a magnetic sleeve 3 is sleeved on the outer periphery of the optical unit 1;

[0089] A magnetic inner sheath 5, which is sleeved on the outer periphery of the magnetic attraction unit, and an annular gap is formed between the magnetic inner sheath 5 and the magnetic unit; a magnetic attraction piece 4 is attached to the inner side of the magnetic inner sheath 5, and the magnetic attraction piece 4 is located directly above the axial center of the magnetic attraction unit, and the magnetic attraction force between the magnetic attraction piece 4 and the magnetic attraction unit is equal to the gravity of the magnetic attraction unit;

[0090] An outer sheath 8, which wraps the outer periphery of the magnetic inner sheath 5.

[0091] The anti-seismic optical cable sets the magnetic attraction piece 4 on the inner side of the magnetic inner sheath 5, and the magnetic attraction piece 4 can also overcome the gravity of the magnetic attraction unit by generating a magnetic attraction force with the magnetic attraction unit, and then cooperate with the magnetic force between the magnetic inner sheath 5 and the magnetic attraction unit to realize the floating of the magnetic attraction unit inside the magnetic inner sheath 5. Specifically, the anti-seismic optical cable has the same structure and preparation method as the aforementioned partial anti-seismic optical cable, and the only difference is that the magnetic attraction piece 4 is arranged on the inner side of the magnetic inner sheath 5. The principle and advantages of the anti-seismic optical cable are described above, and will not be repeated here.

[0092] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical cable resistant to earthquakes, characterized in that, include: A magnetic attraction unit includes at least one optical unit. A magnetic sleeve is fitted around the outer periphery of the optical unit, and a magnetic attraction sheet is attached to the outer end of the magnetic sleeve. The magnetic attraction sheet, the axial center of the magnetic attraction unit, and the center of gravity of the magnetic attraction unit are vertically coincident, and the center of gravity of the magnetic attraction unit is located below the axial center of the magnetic attraction unit. A magnetic inner sheath is fitted around the outer periphery of the magnetic attraction unit, and an annular gap is formed between the magnetic inner sheath and the magnetic attraction unit. The magnetic attraction force between the magnetic attraction piece and the magnetic inner sheath is equal to the weight of the magnetic attraction unit. The magnetic attraction force of the magnetic inner sheath is generated by energizing the magnetic inner sheath. An outer sheath, which wraps around the outer periphery of the magnetic inner sheath.

2. The optical cable of claim 1, wherein, There are multiple optical units, and a first buffer layer is filled between the multiple optical units and the magnetic sleeve.

3. The optical cable of claim 1, wherein, Water-blocking powder is also filled between the annular gap formed by the magnetic inner sheath and the magnetic sleeve, and the water-blocking powder partially fills the space of the annular gap.

4. The optical cable of claim 1, wherein, An armor layer is provided between the magnetic inner sheath and the outer sheath, and at least one cable is provided between the armor layer and the outer sheath.

5. A method for producing the optical cable resistant to earthquakes as claimed in any one of claims 1 to 4, characterized by, Includes the following steps: S1 provides optical units; S2. A magnetic sleeve is extruded and formed on the outer periphery of the optical unit, and a magnetic absorbing sheet is simultaneously extruded and formed on the outer side of the magnetic sleeve to form a magnetic absorbing unit. S3. The magnetic inner sheath is formed using a vacuum sizing method; S4. Arrange the magnetic sheet facing upwards, fit the magnetic unit into the magnetic inner sheath, and extrude the outer sheath to form the outer sheath outside the magnetic inner sheath.

6. The method of claim 5, wherein the step of applying the coating is performed by extrusion. Step S3 specifically includes: The inner sheath is formed by vacuum sizing, cooled and shaped, and then covered with a steel strip. A coil is wound around the outer circumference of the steel strip to obtain a magnetic inner sheath.

7. The method of claim 5, wherein the step of applying the coating is performed by extrusion. Step S2 specifically includes: Multiple optical units are arranged in an array, and a counterweight is placed below the center of the array. Magnetic sleeves are extruded around the optical units and the counterweight, and magnetic sheets are simultaneously extruded at the outer end of the magnetic sleeves.

8. The method of claim 5, wherein the step of applying the coating is performed by extrusion. The molding raw materials for the magnetic sleeve include the following components: 60wt%~70wt% neodymium iron boron magnetic powder, 29wt%~37wt% nylon, and 1wt%~3wt% polyethylene glycol.

9. The method of claim 5, wherein the step of providing a cable further comprises providing a cable having a cable core comprising a plurality of optical fibers and a cable jacket surrounding the cable core. After the magnetic unit is fitted onto the magnetic inner sheath in step S4, the following steps are also included: An FRP rod is attached to the outer periphery of the magnetic inner sheath to form an armor layer, and a cable is placed on the outside of the armor layer.

10. A method for installing an optical cable resistant to earthquakes, for installing an optical cable resistant to earthquakes as claimed in any one of claims 1 to 4, characterized in that, Includes the following steps: Place the shock-resistant optical cable in the channel and rotate it along the cable axis so that the magnetic absorbing plate faces vertically upward. Then, energize and magnetize the magnetic inner sheath. Adjust the voltage or current intensity of the magnetic inner sheath so that the magnetic attraction force between the magnetic absorbing plate and the magnetic inner sheath is equal to the weight of the magnetic unit, and the magnetic unit is in a floating state inside the magnetic inner sheath.

11. A method of maintaining a shock resistant optical cable for maintaining a shock resistant optical cable as claimed in any one of claims 1 to 4, characterized in that, Includes the following steps: Disconnect the power supply to the magnetic inner sheath, reconnect the power to the magnetic inner sheath, and adjust the voltage or current intensity of the magnetic inner sheath so that the magnetic attraction force between the magnetic sheet and the magnetic inner sheath is equal to the weight of the magnetic unit, and the magnetic unit is in a floating state inside the magnetic inner sheath.

12. A fiber optic cable resistant to earthquakes, characterized in that, include: A magnetic attraction unit, the magnetic attraction unit including at least one optical unit, the optical unit being surrounded by a magnetic sleeve; A magnetic inner sheath is sleeved on the outer periphery of the magnetic attraction unit, and an annular gap is formed between the magnetic inner sheath and the magnetic attraction unit; a magnetic attraction piece is attached to the inner side of the magnetic inner sheath, and the magnetic attraction piece is located directly above the axial center of the magnetic attraction unit, and the magnetic attraction force between the magnetic attraction piece and the magnetic attraction unit is equal to the gravity of the magnetic attraction unit; An outer sheath is wrapped on the outer periphery of the magnetic inner sheath.

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