Polar low-temperature flexible shielding cable and its preparation method

Abstract

The present invention relates to the technical field of wire and cable, and particularly relates to an arctic low-temperature flexible shielded cable and a preparation method thereof. The cable includes a core, a filling layer, a wrapping layer, an inner sheath, a heat-insulating layer, an elastic shielding layer, and an outer sheath. The elastic shielding layer includes a shielding mesh and a plurality of elastic strips uniformly distributed circumferentially. The plurality of elastic strips are woven in the shielding mesh. When the cable is twisted, the tensile force on the shielding mesh is reduced, preventing the shielding mesh from being torn and improving the service life of the cable. At the same time, conductive graphite particles are filled in the weaving gaps. When the cable is frequently twisted, due to the deformation of the shielding mesh and the elastic strips, the friction particles are squeezed and rub against each other to generate heat, which can buffer the external low temperature. An oil-filled heat-insulating layer is provided between the elastic shielding layer and the inner sheath, which can play a role in heat storage and insulation, absorb the heat generated when the conductor is energized, and prevent heat dissipation caused by continuous heat exchange between the conductor and the elastic shielding layer.

Description

Technical Field

[0001] The present invention relates to the technical field of wire and cable, and more particularly to an arctic low-temperature flexible shielded cable and a preparation method thereof. Background Art

[0002] An arctic low-temperature flexible shielded cable is a high-performance cable designed for extremely harsh environments, capable of maintaining its electrical and mechanical properties at low temperatures and operating in extreme low-temperature and high mechanical stress environments, such as in scientific research vessels, meteorological observations, ice exploration vehicles, arctic drilling equipment, and arctic environmental exploration in the arctic environment. In extremely cold environments, it is necessary to ensure the normal and stable transmission of electric power and signal control, and maintain a reliable connection for the power supply and control system of the scientific research station.

[0003] Traditional power cables and control cables are prone to hardening, embrittlement, and even a decline in electrical performance or failure in low-temperature environments. Problems such as sheath fracture and fault occur in designs such as under-ice, ship hull penetration, and equipment connection, affecting the electrical and insulation performance of the cable. Special low-temperature-resistant cables are required, such as polymer cables using ethylene-tetrafluoroethylene (ETFE), polyvinylidene fluoride (PVDF), etc. in the prior art, combined with a conductor structure of stranded multi-strand thin wires, a soft insulating material, and a flexible braided shield layer or aluminum foil shield layer, combining low-temperature-resistant materials, flexible design, and electromagnetic shielding technology to ensure stable operation in harsh environments and remain flexible at extremely low temperatures (such as -60°C or lower) without hardening or breaking.

[0004] For example, scientific research stations in Antarctica and the Arctic need to operate at extremely low temperatures for a long time. Scientific research equipment, sensors, and detection instruments all require reliable power and data connections. The weather stations installed in the Antarctic scientific research station use low-temperature-resistant cables to connect sensors and data recorders to ensure the stable transmission of data such as temperature, wind speed, and humidity, and can still work normally even below -60°C. Low-temperature flexible cables are required on icebreakers to connect navigation equipment, communication systems, and power equipment to ensure reliable progress in the ice-covered waters of the polar regions. Affected by long-term exposure and extremely low temperatures, the flexibility of the cable decreases, and along with outdoor low-temperature and strong wind weather (wind force above level 5 for a long time), it causes the cable to be frequently dragged back and forth and swing irregularly, posing requirements for the anti-torsion and mechanical strength of the torsion part of the cable. In an extremely low-temperature state, the frequent torsion, dragging, and irregular swinging of the torsion part will cause damage and even fracture of the cable insulation and shield. Summary of the Invention

[0005] In view of the technical problems existing in the prior art, in the first aspect of the present invention, an arctic low-temperature flexible shielded cable is proposed, including:

[0006] Multiple wire cores arranged tangentially to each other in pairs;

[0007] A filling layer is filled in the gaps between the plurality of wire cores and is wrapped by a wrapping layer to form a circular cross-sectional shape;

[0008] An inner sheath is extruded on the outer side of the wrapping layer;

[0009] A heat insulation layer and an elastic shielding layer are provided on the outer side of the inner sheath, and the heat insulation layer is located between the inner sheath and the elastic shielding layer for reducing the heat exchange between the wire core and the elastic shielding layer;

[0010] An outer sheath is extruded on the outer side of the elastic shielding layer;

[0011] Wherein, the elastic shielding layer includes a shielding net and a plurality of elastic strips evenly distributed circumferentially, and the plurality of elastic strips are woven in the shielding net so that the shielding net can elastically contract;

[0012] Friction particles are filled in the gaps where the shielding net and the elastic strips are woven with each other for generating heat by friction when the cable is twisted.

[0013] Preferably, the elastic strips are arranged along the axial direction of the cable, and the shielding net is woven in an 8-shaped structure along the circumferential direction of the cable outside the elastic strips.

[0014] Preferably, the elastic strips are arranged in a long strip structure with a circular cross-section so that the shielding net woven outside the elastic strips forms convex and concave parts evenly distributed along the circumferential direction of the cable, and the friction particles are filled in the concave parts and are squeezed by the convex parts to generate heat by friction.

[0015] Preferably, the braided copper wires of the shielding net are 16 ingots, each ingot has 8 copper wires, and the braiding angle is 30-60°, and the braiding density is less than 90%.

[0016] Preferably, the inside of the elastic strip is arranged in a hollow structure with a circular cross-section or a hollow structure with an oval cross-section. When the cross-section of the hollow structure is oval, the long axis of the oval is arranged along the radial direction of the cable, and the short axis of the oval is arranged tangentially along the circumferential direction of the cable.

[0017] Preferably, the friction particles are conductive graphite particles with a diameter of 40-100 microns.

[0018] Preferably, the heat insulation layer includes a sleeve, the sleeve is sleeved on the outer side of the inner sheath, and an annular cavity with a width of 1.0-5.0 mm is formed between the sleeve and the inner sheath, and the cavity is filled with cable oil for heat insulation.

[0019] Preferably, the core includes a conductor and an insulating layer extruded outside the conductor, and the insulating layer is provided as a three-layer co-extruded layer including a conductor shield, insulation, and an insulation shield.

[0020] Preferably, the conductor is made by stranding a number of annealed copper wires in a 1+6+12 structure, with the stranding directions of the inner layer and the outer layer being opposite, the stranding pitch ratio of the inner layer being 10 times, and the stranding pitch ratio of the outer layer being 8 times.

[0021] In a second aspect of the present invention, a method for manufacturing a polar low-temperature flexible shielded cable is proposed, including the following steps:

[0022] Step S1, preparing the core. Use a stranding machine to strand a number of annealed copper wires in a 1+6+12 structure to form a conductor, with the stranding pitch ratio of the inner layer being 10 times and the stranding pitch ratio of the outer layer being 8 times. Then use an extruder to extrude the insulating layer outside the conductor, and after cooling, form the core;

[0023] Step S2, wrapping and solidifying. Arrange multiple cores in pairs tangentially, and fill the filling layer in the slit. Then use a wrapping machine to wrap the cores and the filling layer to form the wrapping layer;

[0024] Step S3, preparing the inner sheath. Use an extruder to extrude the inner sheath outside the wrapping layer;

[0025] Step S4, preparing the heat-insulating layer. Use an extruder to extrude the sleeve outside the inner sheath, and form a cavity between the inner sheath and the sleeve. While extruding, fill the cable oil into the cavity to form the heat-insulating layer;

[0026] Step S5, preparing the elastic shield layer. First, use an extruder to extrude the long strip-shaped elastic strips, and evenly distribute multiple elastic strips along the circumference of the cable. Then use a braiding machine to continuously braid the shielding net outside the multiple elastic strips to form the elastic shield layer;

[0027] Step S6, preparing the outer sheath. Use a filling machine to fill friction particles in the braiding gaps of the shielding net, and at the same time use an extruder to extrude the outer sheath.

[0028] Compared with the prior art, the significant advantages of the polar low-temperature flexible shielded cable proposed by the present invention are as follows:

[0029] 1. When using galvanized copper wire to weave the shielding net, it is interlaced with elastic strips to form an elastic shielding layer. The elastic strips can provide elastic contraction space for the shielding net. When the cable is twisted, the tensile force on the shielding net is reduced to prevent the shielding net from being torn, thereby increasing the service life of the cable. At the same time, conductive graphite particles are filled in the weaving gap. When the cable is frequently twisted, the deformation of the shielding net and the elastic strips is utilized, and the friction particles are squeezed and rubbed against each other to generate heat, which can buffer the external low temperature;

[0030] 2. An oil-filled insulation layer is set between the elastic shielding layer and the inner sheath, which can play a role in heat storage and heat preservation, absorb the heat generated when the conductor is energized, and avoid heat loss caused by continuous heat exchange between the conductor and the elastic shielding layer;

[0031] 3. The conductive graphite particles filled in the elastic shielding layer and the cable oil filled in the insulation layer both have a lubricating effect. When the cable is twisted, they can not only keep the cable warm, but also reduce the friction between the internal sheaths of the cable and improve the torsion resistance.

[0032] It should be understood that all combinations of the aforementioned concepts and the additional concepts described in more detail below can be considered as part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent. In addition, all combinations of the claimed subject matter are considered as part of the inventive subject matter of the present disclosure.

[0033] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in each figure may be represented by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings.

[0035] Figure 1 It is a structural schematic diagram of the polar low-temperature resistant flexible shielded cable shown in the present invention.

[0036] Figure 2 It is a cross-sectional schematic diagram of the polar low-temperature resistant flexible shielded cable shown in the present invention.

[0037] Figure 3 It is a schematic diagram of the elastic shielding layer structure of the polar low-temperature resistant flexible shielded cable shown in the present invention.

[0038] Figure 4It is a schematic diagram of the shielding net braiding structure of the polar low - temperature flexible shielding cable shown in the present invention.

[0039] Figure 5 It is a schematic diagram of the hollow structure of the elliptical cross - section of the elastic strip in the polar low - temperature flexible shielding cable shown in the present invention.

[0040] In the figure, 1 is the core; 11 is the conductor; 12 is the insulating layer; 2 is the filling layer; 3 is the wrapping layer; 4 is the inner sheath; 5 is the sleeve; 501 is the cavity; 51 is the cable oil; 6 is the elastic shielding layer; 61 is the shielding net; 62 is the elastic strip; 63 is the friction particles; 601 is the convex part; 602 is the concave part; 7 is the outer sheath. Detailed implementation manners

[0041] To better understand the technical content of the present invention, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows.

[0042] In the present disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily intended to cover all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in the present invention are not limited to any implementation manner. Additionally, some aspects of the present invention can be used alone, or in any suitable combination with other aspects of the present invention.

[0043] Polar low temperature flexible shielded cable

[0044] Combined with Figures 1 to 4 As shown, the polar low - temperature flexible shielding cable of the embodiment of the present invention includes a core 1, a filling layer 2, a wrapping layer 3, an inner sheath 4, a thermal insulation layer, an elastic shielding layer 6, and an outer sheath 7.

[0045] Combined with Figure 1 、 2 As shown, multiple cores 1 are arranged tangentially to each other in pairs. In the figure, a 4 - core example is taken. The filling layer 2 is filled in the gaps between multiple cores 1 and is wrapped by the wrapping layer 3 to form a circular cross - section shape, and the cable is formed into a round and complete structure. Among them, the filling layer 2 is filled with fiberglass ropes, which has good flexibility and can increase the axial tensile performance of the cable.

[0046] Among them, the aforementioned inner sheath 4 is made of acrylate rubber and is extruded on the outer side of the wrapping layer 3, and still has good flexibility and oil resistance at low - temperature states.

[0047] In a specific embodiment, the core 1 includes a conductor 11 and an insulating layer 12.

[0048] Among them, the conductor 11 is made by stranding several strands of annealed copper wires in a 1 + 6 + 12 structure. The stranding directions of the inner layer and the outer layer are opposite. The stranding pitch ratio of the inner layer is 10 times, and the stranding pitch ratio of the outer layer is 8 times. The smaller stranding pitch can make the conductor 11 softer and have good flexural characteristics.

[0049] The insulating layer 12 is extruded on the outer side of the conductor 11. The insulating layer 12 is arranged as a three-layer co-extruded layer including a conductor shield, insulation, and an insulation shield.

[0050] As an example, the insulation is made of cross-linked polyethylene material, and both the conductor shield and the insulation shield are made of semi-conductive polyolefin material.

[0051] In an alternative embodiment, the wrapping layer 3 is made of polyester tape, and multiple wire cores 1 and the filling layer 2 are wound and fixed in a wrapping form.

[0052] Combined Figure 1 and Figure 2 As shown, a heat insulation layer and an elastic shielding layer 6 are provided on the outer side of the inner sheath 4. The heat insulation layer is located between the inner sheath 4 and the elastic shielding layer 6 and is used to reduce the heat exchange between the wire core and the elastic shielding layer 6.

[0053] In a specific embodiment, the heat insulation layer includes a sleeve 5. The sleeve 5 is sleeved on the outer side of the inner sheath 4, and an annular cavity 501 is formed between the sleeve 5 and the inner sheath 4, and the width range thereof is 1.0 - 5.0 mm.

[0054] In the cavity 501, cable oil 51 for heat insulation is filled. The cable oil uses synthetic oil, and its main component is mineral oil with insulating characteristics. The specific heat capacity of the mineral oil is relatively high, and it can absorb the heat generated when the conductor 11 is energized, avoiding heat dissipation caused by continuous heat exchange between the conductor 11 and the elastic shielding layer 6, and playing a role in heat storage and insulation.

[0055] Combined Figure 1 、 Figure 3 and Figure 4 As shown, the elastic shielding layer 6 includes a shielding net 61 and multiple elastic strips 62 evenly distributed circumferentially.

[0056] Among them, multiple elastic strips 62 are arranged along the axial direction of the cable. The shielding net 61 is woven and formed by galvanized copper wires. When weaving the shielding net 61, the galvanized copper wires and multiple elastic strips 62 are woven alternately.

[0057] In a preferred example, the galvanized copper wires are woven in an 8-shaped structure along the circumferential direction of the cable outside multiple elastic strips 62 so that the shielding net 61 can elastically contract.

[0058] Thus, during frequent processes such as the disordered twisting, swinging, and dragging of the cable, the elastic strip 62 provides an elastic contraction space for the shielding net 61, reducing the tensile force on the shielding net 61, avoiding the shielding net 61 from being torn, deformed, or ripped, improving the flexibility and anti-torsion characteristics of the cable, and enhancing its mechanical properties and service life.

[0059] Furthermore, the interlaced weaving of the shielding net 61 and the elastic strip 62 will generate gaps, and friction particles 63 are filled in the gaps where the shielding net 61 and the elastic strip 62 are woven with each other. During the frequent twisting of the cable, as the shielding net 61 and the elastic strip 62 deform, the friction particles 63 are squeezed and rubbed against each other to generate heat, which can buffer the external low temperature.

[0060] In an alternative embodiment, the friction particles 63 are made of conductive graphite particles with a median particle size of 40 - 100 microns, which have lubricity and conductivity themselves, and can increase the electromagnetic shielding performance of the cable.

[0061] In an alternative embodiment, the braided copper wires of the shielding net 61 are 16 ingots, each ingot has 8 copper wires, and the braiding angle is 30 - 60°, and the braiding density is less than 90%, preferably the braiding density is 80%. Under the condition of meeting the shielding effect, more gaps can be formed on the surface of the shielding net 61, thereby increasing the filling amount of the friction particles 63.

[0062] In a specific embodiment, the elastic strip 62 is arranged in a long strip structure with a circular cross-section, so that the shielding net 61 woven outside the elastic strip 62 forms convex portions 601 and concave portions 602 that are evenly distributed along the circumferential direction of the cable. The concave portions 602 can further increase the filling amount of the friction particles 63. When the cable twists, the convex portions 601 intensify the disturbance of the friction particles 63, increasing the amount of heat generated by friction, and playing a role in generating and maintaining the temperature of the cable body.

[0063] In an alternative embodiment, the inside of the elastic strip 62 is arranged in a circular hollow structure that is beneficial to elastic deformation, and the ratio of the diameter to the aperture of the elastic strip 62 is 3:2, which can improve the deformation amount of the elastic strip 62, and further increase the anti-torsion performance of the shielding net 61. At the same time, since air is a poor conductor of heat, the hollow elastic strip 62 can reduce the heat exchange between the wire core and the external environment, playing a role in heat preservation and low-temperature resistance.

[0064] Combined Figure 5 As shown, in another alternative embodiment, the inside of the elastic strip 62 is arranged in an elliptical hollow structure that is beneficial to elastic deformation. The long axis of the ellipse is arranged along the radial direction of the cable, and the short axis of the ellipse is arranged tangentially along the circumferential direction of the cable, making the elastic strip 62 more easily deformable in the direction of the short axis (i.e., the circumferential direction of the cable), thereby improving the flexibility of the cable during twisting.

[0065] Combined Figure 1As shown, the outer sheath 7 is extruded on the outside of the elastic shielding layer 6. The outer sheath 7 is made of thermoplastic polyurethane rubber by extrusion, which has good cold resistance and still has good flexibility and elasticity in a low-temperature environment of -35°C.

[0066] Preparation method of polar low temperature flexible shielded cable

[0067] According to the second aspect disclosed in the embodiments of the present invention, a method for manufacturing a polar low-temperature flexible shielded cable is proposed, including the following steps: preparing a core, wrapping and fixing, preparing an inner sheath, preparing a thermal insulation layer, preparing an elastic shielding layer, and preparing an outer sheath.

[0068] S1: Preparing a core, including the following steps:

[0069] 1-1. Using a stranding machine to strand several annealed copper wires into a conductor 11 with a structure of 1+6+12. The stranding directions of the inner layer and the outer layer are opposite. The stranding pitch ratios of the inner layer are all 10 times, and the stranding pitch ratio of the outer layer is 8 times.

[0070] 1-2. Using an extruder to simultaneously extrude a conductor shield, insulation, and insulation shield on the outside of the conductor 11, and forming a three-layer co-extruded insulation layer 12 after cooling.

[0071] S2: Wrapping and fixing, including the following steps:

[0072] Arranging multiple cores 1 tangent to each other pairwise, filling a filling layer 2 in the slit, and then using a wrapping machine to wrap and fix the core 1 and the filling layer 2 with a polyester tape to form a wrapping layer 3.

[0073] S3: Preparing an inner sheath, including the following steps:

[0074] Using an extruder to extrude acrylate rubber on the outside of the wrapping layer 3, and forming an inner sheath 4 with a thickness of 3 mm after cooling.

[0075] S4: Preparing a thermal insulation layer, including the following steps:

[0076] 4-1. Using an extruder to extrude a sleeve 5 on the outside of the inner sheath 4, and forming an annular cavity 501 with a width of 4 mm between the inner sheath 4 and the sleeve 5. Cooling is carried out during extrusion to quickly cool and form it, so as to facilitate filling with cable oil 51.

[0077] 4-2. Filling cable oil 51 into the cavity 501 during extrusion, and finally forming a thermal insulation layer.

[0078] S5: Preparing an elastic shielding layer, including the following steps:

[0079] 5-1. Using an extruder to extrude long strip-shaped elastic strips 62, and evenly distributing multiple elastic strips 62 along the circumference of the cable.

[0080] 5-2. Use a knitting machine to interweave galvanized copper wires and multiple elastic strips 62. The galvanized copper wires are woven along the circumferential direction of the cable and in a figure-eight structure outside the multiple elastic strips 62. The galvanized copper wires form a shielding net 61, and the elastic strips 62 are woven inside the shielding net 61. The woven copper wires of the shielding net 61 are 16 ingots, each ingot has 8 copper wires, and the knitting angle is 30-60°, the knitting density is less than 90%. The mutually woven shielding net 61 and elastic strips 62 form an elastic shielding layer 6.

[0081] S6: Prepare the outer sheath, including the following steps:

[0082] 6-1. Pass the cable completed in knitting in step S5 through the filling machine, and fill friction particles 63 into the knitting gap.

[0083] 6-2. While filling, use an extruder to extrude and wrap thermoplastic polyurethane rubber, and form an outer sheath 7 after cooling.

[0084] Combined with the above embodiments, when using galvanized copper wires to weave the shielding net 61, it is interwoven with the elastic strips 62 to form an elastic shielding layer 6. The elastic strips 62 can provide an elastic contraction space for the shielding net 61. When the cable is twisted, the tensile force on the shielding net 61 is reduced, preventing the shielding net 61 from being torn, and improving the service life of the cable. At the same time, conductive graphite particles are filled in the knitting gap. When the cable is frequently twisted, due to the deformation of the shielding net 61 and the elastic strips 62, the friction particles 63 are squeezed and rubbed against each other to generate heat, which can buffer the external low temperature.

[0085] A heat-insulating layer filled with oil is arranged between the elastic shielding layer 6 and the inner sheath 4, which can play a role in heat storage and insulation, absorb the heat generated when the conductor 11 is energized, and prevent the heat from being dissipated due to continuous heat exchange between the conductor 11 and the elastic shielding layer 6.

[0086] The conductive graphite particles filled in the elastic shielding layer 6 and the cable oil filled in the heat-insulating layer both have a lubricating effect. When the cable is twisted, the friction between the inner sheaths inside the cable can be reduced, and the anti-twisting performance can be improved.

[0087] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to what is defined by the claims.

Claims

1. A polar low-temperature resistant flexible shielded cable, characterized in that, Comprising: Multiple wire cores (1) arranged in pairwise tangency; A filling layer (2) filled in the gaps between the multiple wire cores (1), and the wire cores (1) and the filling layer (2) are wrapped together by a wrapping layer (3) to form a circular cross-section shape; An inner sheath (4) extruded on the outer side of the wrapping layer (3); A heat-insulating layer and an elastic shielding layer (6) are provided on the outer side of the inner sheath (4), and the heat-insulating layer is located between the inner sheath (4) and the elastic shielding layer (6) for reducing the heat exchange between the wire core and the elastic shielding layer (6); An outer sheath (7) extruded on the outer side of the elastic shielding layer (6); Wherein, the elastic shielding layer (6) includes a shielding mesh (61) and multiple elastic strips (62) uniformly distributed circumferentially, and the multiple elastic strips (62) are woven in the shielding mesh (61) so that the shielding mesh (61) can elastically contract; The elastic strips (62) are arranged along the axial direction of the cable, and the shielding mesh (61) is woven in an 8-shaped structure along the circumferential direction of the cable on the outer side of the elastic strips (62); Friction particles (63) are filled in the gaps where the shielding mesh (61) and the elastic strips (62) are woven with each other for generating heat by friction when the cable is twisted; The elastic strips (62) are set to have a long strip-shaped structure with a circular cross-section so that the shielding mesh (61) woven on the outer side of the elastic strips (62) forms convex portions (601) and concave portions (602) uniformly distributed along the circumferential direction of the cable, and the friction particles (63) are filled in the concave portions (602) and are squeezed and rubbed by the convex portions (601) to generate heat; The braided copper wires of the shielding mesh (61) are 16 ingots, each ingot has 8 copper wires, and the braiding angle is 30 - 60°, and the braiding density is less than 90%; The friction particles (63) are made of conductive graphite particles with a median particle size of 40 - 100 microns; The heat-insulating layer includes a sleeve (5), the sleeve (5) is sleeved on the outer side of the inner sheath (4), and an annular cavity (501) with a width of 1.0 - 5.0 mm is formed between the sleeve (5) and the inner sheath (4), and the cavity (501) is filled with cable oil (51) for heat insulation; 2. The polar low-temperature flexible shielding cable according to claim 1, characterized in that, The inside of the elastic strip (62) is set to have a hollow structure with a circular cross-section or a hollow structure with an elliptical cross-section. When the cross-section of the hollow structure is elliptical, the major axis of the ellipse is arranged along the radial direction of the cable, and the minor axis of the ellipse is arranged along the circumferential direction tangent to the cable; 3. The polar low temperature flexible shielding cable according to claim 1, characterized in that, The wire core (1) includes a conductor (11) and an insulating layer (12) extruded on the outer side of the conductor (11), and the insulating layer (12) is set to be a three-layer co-extruded layer including a conductor shield, insulation, and an insulation shield; 4. The polar low-temperature flexible shielded cable according to claim 3, characterized in that, The conductor (11) is made by stranding a number of annealed copper wires in a 1 + 6 + 12 structure, and the stranding directions of the inner layer and the outer layer are opposite, the stranding pitch ratio of the inner layer is 10 times, and the stranding pitch ratio of the outer layer is 8 times; 5. A method for preparing a polar low-temperature flexible shielded cable as described in any one of claims 1 to 4, characterized in that, Including the following steps: Step S1: Prepare the core. Use a stranding machine to strand a number of annealed copper wires in a 1+6+12 structure to form the conductor (11). The inner layer stranding pitch ratio is 10 times, and the outer layer stranding pitch ratio is 8 times. Then use an extruder to extrude and wrap the insulation layer (12) on the outside of the conductor (11), and form the core (1) after cooling; Step S2: Wrap and solidify. Arrange multiple cores (1) in pairs tangentially, and fill the filling layer (2) in the slit. Then use a wrapping machine to wrap the cores (1) and the filling layer (2) to form the wrapping layer (3); Step S3: Prepare the inner sheath. Use an extruder to extrude and wrap the inner sheath (4) on the outside of the wrapping layer (3); Step S4: Prepare the thermal insulation layer. Use an extruder to extrude and wrap the sleeve (5) on the outside of the inner sheath (4), and form a cavity (501) between the inner sheath (4) and the sleeve (5). While extruding, fill the cable oil (51) into the cavity (501) to form the thermal insulation layer; Step S5: Prepare the elastic shielding layer. First, use an extruder to extrude the long strip-shaped elastic strips (62), and evenly distribute multiple elastic strips (62) along the circumference of the cable. Then use a braiding machine to continuously braid the shielding mesh (61) on the outside of multiple elastic strips (62) to form the elastic shielding layer; Step S6: Prepare the outer sheath. Use a filling machine to fill the friction particles (63) into the braiding gaps of the shielding mesh (61), and at the same time use an extruder to extrude and wrap the outer sheath (7).

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