Weather-proof and radiation-proof cable and preparation method thereof

Abstract

The invention discloses a weather-proof and radiation-proof cable and a preparation method thereof, and relates to the technical field of power cables, the weather-proof and radiation-proof cable comprises a cable main body, the cable main body comprises an outer sheath, a cable core body and a cold and hot adjusting assembly, the cable core body comprises a core wire layer, a filling rope, a lining layer, an armor layer and an outer lining layer, the core wire layer is composed of a conductor and an insulating layer, and the outer lining layer is composed of an inner sheath and an outer sheath. And the filling rope is positioned between the core wire layer and the lining layer. Through the arrangement of the outer adjusting plate, the inner adjusting plate, the elastic sheet and the like, when the cable core body and the outer sheath are subjected to thermal expansion at the same time, the elastic sheet can relieve and counteract expansion force borne by the inner side and the outer side, the situation that the cable core body causes excessive mechanical stress to the outer sheath is avoided, and the service life of the outer sheath is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to a weather-resistant and radiation-proof cable and a preparation method thereof. Background Art

[0002] Cross-linked polyethylene insulated cable is a kind of cable suitable for distribution network and other fields, which has advantages that PVC insulated cable cannot match. It has the advantages of light weight, good heat resistance, strong load capacity, no melting, chemical corrosion resistance, and high mechanical strength.

[0003] In some plateau areas, the cable materials will experience significant changes in thermal expansion and contraction due to the rising temperature during the day and the sudden drop in temperature at night. Moreover, when the cable is energized, the resistance loss caused by the current passing through the conductor will increase the temperature inside the cable. Combined with the high temperature during the day, the conductor and insulation material inside the cable will expand due to the temperature rise, and will shrink significantly at night due to the drop in temperature. This repeated expansion and contraction will cause changes in the internal stress of the material, which may cause material fatigue in the long term and reduce the mechanical strength of the cable.

[0004] The Chinese patent with application number CN202410090266.3 discloses a weather-resistant photovoltaic cable and its preparation method; including a power transmission component, which includes several groups of conductive parts, a wrapping layer coated on the outside of several groups of the conductive parts, and a filling layer filled inside the wrapping layer and located on the outside of the conductive parts; a protection component, coated on the outside of the power transmission component, the protection component includes an insulating layer, and an anti-cracking layer coated on the outside of the insulating layer; and an outer protection component, coated on the outside of the protection component, the outer protection component includes an anti-radiation layer and an anti-corrosion layer located on the inside of the anti-radiation layer. The cable of the present invention has good high temperature resistance and cold resistance, can effectively adapt to the temperature difference changes in the plateau area, and ensure the stable transmission of current. Secondly, carbon black is added to turn the white polytetrafluoroethylene into black, which effectively blocks long-term ultraviolet radiation in the plateau environment. Although the invention adopts the method of combining lead-free PVC and plasticizer to make the lead-free PVC softer, the thermal expansion and contraction of the cable are alleviated. However, there are at least the following problems: 1. Although the outer sheath of the prior art adopts soft lead-free PVC material to alleviate the problem of thermal expansion and contraction, the outer sheath itself will still expand and contract. When the outer sheath and the cable core expand simultaneously, the expansion force of the cable core will be applied to the outer sheath, causing the outer sheath to accumulate a large amount of external mechanical stress. Over time, as the outer sheath continues to expand and contract, it will not only cause its surface deformation, but even cracking due to the accumulation of a large amount of mechanical stress.

[0005] 2. For the outer sheath and insulation layer of the cable, long-term exposure to ultraviolet rays will cause the molecular chain to break, making the material hard and brittle, the color faded, and even cracked. The existing technology blocks ultraviolet rays by changing the color of the material, but the effect is relatively limited. After long-term use, aging, hardening and cracking will still occur. Once cracks occur on the surface of the cable, moisture may penetrate into the interior of the cable, causing problems such as conductor corrosion and decreased insulation resistance.

[0006] To this end, the present invention proposes a weather-resistant and radiation-proof cable and a preparation method thereof to solve the above problems. Summary of the invention

[0007] The object of the present invention is to provide a weather-resistant and radiation-proof cable and a preparation method thereof, so as to solve the technical problems proposed in the above background technology that the outer sheath of the cable is subjected to greater mechanical stress during thermal expansion and the outer sheath shrinks more during cold contraction.

[0008] To achieve the above object, the present invention provides the following technical solution: a weather-resistant and radiation-proof cable, comprising a cable body, wherein the cable body comprises an outer sheath; and a cable core, wherein the cable core comprises a core layer, a filling rope, an inner lining layer, an armor layer and an outer lining layer from inside to outside, the core layer is composed of a conductor and an insulating layer, the filling rope is located between the core layer and the inner lining layer, and the outer lining layer is coated on the outer side of the armor layer and located on the inner side of the outer sheath; The hot and cold adjustment component is located between the outer lining and the outer sheath, and includes an inner adjustment ring sleeved on the outer lining and an outer adjustment ring in contact with the inner wall of the outer sheath, the inner adjustment ring includes a plurality of inner adjustment plates evenly distributed around the circumference, and the inner adjustment plates extend along the length direction of the cable body, the outer adjustment ring includes a plurality of outer adjustment plates evenly distributed around the circumference, and the outer adjustment plates extend along the length direction of the cable body, and an elastic sheet is fixedly connected between each outer adjustment plate and the inner adjustment plate.

[0009] Preferably, the two ends of the elastic sheet are fixedly connected to the middle of the inner adjustment plate and the middle of the outer adjustment plate respectively. When the cable body is in a thermal expansion state, the outer adjustment plate and the inner adjustment plate opposite to each other approach each other, so that the elastic sheet is compressed. When the cable body is in a cold contraction state, the outer adjustment plate compresses the elastic sheet to make the inner adjustment plate slide on the circumferential side of the outer lining.

[0010] Preferably, the inner side surface of the inner adjustment plate is an arc-shaped structure and fits with the outer lining layer, and each contact surface between the inner adjustment plate and the outer lining layer is provided with a heat-insulating layer.

[0011] Preferably, a plurality of first elastic bands are arranged between two adjacent inner adjustment plates, and the plurality of first elastic bands are equidistantly distributed along the length direction of the cable body, and a heat overflow gap is formed between two adjacent first elastic bands. The two sides of the first elastic band are respectively fixedly connected to the two adjacent inner adjustment plates. The first elastic band is in a stretched state and the contraction direction is consistent with the contraction direction of the two adjacent inner adjustment plates, so as to assist the plurality of inner adjustment plates to approach each other.

[0012] Preferably, a second elastic band is arranged between two adjacent outer adjustment plates, and the two sides of the second elastic band are respectively fixedly connected to the two adjacent outer adjustment plates. The second elastic band is in a stretched state and the contraction direction is consistent with the contraction direction of the two adjacent outer adjustment plates, so as to assist multiple outer adjustment plates to approach each other.

[0013] Preferably, the outer side surface of each of the outer adjustment plates is arc-shaped and consistent with the curvature of the inner wall of the outer sheath, and the outer side surface of the outer adjustment plate is provided with a first waterproof layer.

[0014] Preferably, the outer side of each of the second elastic bands is provided with a second waterproof layer.

[0015] Preferably, the first waterproof layer and the second waterproof layer swell when exposed to water and have bright colors.

[0016] Preferably, a third elastic band is provided between the first and second adjacent elastic bands, the third elastic band is in a stretched state and the stretching direction is consistent with the radial direction of the cable body, and the third elastic band brings the first elastic band and the second elastic band closer to each other.

[0017] A method for preparing a weather-resistant radiation-proof cable comprises the following steps: Step 1: Conductor manufacturing: at room temperature, the copper rod is drawn into a copper wire, and then the copper wire is heated and maintained at 500-600°C for two hours, and then the copper wire is twisted by twisting multiple single wires to form a copper stranded wire; Step 2: Coating the insulation layer, using a traction machine to pull the copper stranded wire and coat it with cross-linked polyethylene to obtain a core wire layer; Step 3: Extrusion of the inner lining layer: the inner lining layer is extruded by an extruder and wrapped on multiple core wire layers. The core wire layer is positioned during wrapping, and a filling rope is added between the core wire layer and the inner lining layer; Step 4: Set the armor layer, wrap the steel wires around the outer side of the inner lining layer in a back-twisting manner, so that each steel wire fits tightly together to form an armor layer; Step 5: Extrusion of the outer lining layer: the outer lining layer is extruded by an extruder and wrapped on the armor layer; Step 6: Set the hot and cold adjustment component, put the hot and cold adjustment component on the outer lining layer and make the inner adjustment ring contact with the outer lining layer; Step 7: Extrusion of the outer sheath: The outer sheath is extruded by an extruder and wrapped around the outer side of the outer adjustment ring to obtain the cable body.

[0018] The beneficial effects of the present invention are: 1. The present invention is provided with an outer adjustment plate, an inner adjustment plate and an elastic sheet. When the cable core and the outer sheath undergo thermal expansion at the same time, the elastic sheet can alleviate and offset the expansion force on the inner and outer sides, thereby avoiding excessive mechanical stress caused by the cable core to the outer sheath and improving the service life of the outer sheath.

[0019] 2. The present invention is provided with an inner adjustment plate, an insulation layer, an elastic sheet and an outer adjustment plate. When the outer sheath starts to shrink after the outside temperature drops, the inner adjustment plate is squeezed by the outer sheath and starts to approach each other, and the heat overflow gap gradually shrinks until the inner adjustment plate moves to the maximum extent. At this time, the heat overflow gap reaches the minimum state. At this time, the insulation layer arranged on the inner adjustment plate insulates the cable core to reduce the shrinkage of the cable core. At the same time, because the cable core is always in an energized state, the heat inside the cable core is always accumulated. Part of the heat is conducted to the inner wall of the outer sheath through the heat overflow gap, so that the shrinkage of the outer sheath is also improved, avoiding the large shrinkage causing large mechanical stress on the cable body.

[0020] 3. The present invention is provided with a first waterproof layer and a second waterproof layer. When cracks occur on the surface of the outer sheath, the first waterproof layer and the second waterproof layer swell when exposed to water to repair the cracks. During the repair, since the color of the repair material is brighter, maintenance workers can judge where the cracks occur by the color of the cable surface.

[0021] 4. The present invention unifies the winding directions of multiple first elastic bands by setting the third elastic band, preventing some of the first elastic bands from piling up during winding and affecting the movement of multiple inner adjustment plates. At the same time, the second elastic band always maintains a certain gap with the inner wall of the outer sheath under the pulling of the third elastic band, avoiding the second waterproof layer and the outer sheath from being worn and failing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic diagram of the overall structure of a weather-resistant radiation-proof cable and a preparation method thereof.

[0023] Figure 2 It is a schematic diagram of the planar cross-sectional structure of the present invention.

[0024] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at point A in the middle.

[0025] Figure 4 It is a partial three-dimensional cross-sectional schematic diagram of the present invention.

[0026] Figure 5 It is a three-dimensional schematic diagram of the inner adjustment ring in the present invention.

[0027] Figure 6 It is a three-dimensional schematic diagram of the outer adjustment ring in the present invention.

[0028] The accompanying drawings are marked as follows: 1. Cable body; 2. Outer sheath; 3. Cable core; 31. Core layer; 311. Conductor; 312. Insulation layer; 32. Filling rope; 33. Lining layer; 34. Armor layer; 4. Outer lining; 5. Hot and cold adjustment assembly; 51. Inner adjustment ring; 511. Inner adjustment plate; 52. Outer adjustment ring; 521. Outer adjustment plate; 53. Elastic sheet; 54. Insulation layer; 55. First elastic band; 56. Second elastic band; 57. First waterproof layer; 58. Second waterproof layer; 59. Third elastic band. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] Example 1 In the actual production process, although the prior art uses soft lead-free PVC material to alleviate the problem of thermal expansion and contraction of the cable, the outer sheath itself will still expand and contract. When the outer sheath and the cable core expand simultaneously, the expansion force of the cable core will be applied to the outer sheath, causing the outer sheath to accumulate a large amount of additional mechanical stress. Over time, as the outer sheath continues to expand and contract, it will not only cause its surface deformation, but may even cause cracking due to the accumulation of a large amount of mechanical stress. This embodiment is specially invented to solve the above problem.

[0031] See also Figures 1 to 4 As shown, a weather-resistant and radiation-proof cable according to an embodiment of the present invention comprises a cable body 1, wherein the cable body 1 comprises an outer sheath 2, and; The cable core 3 comprises a core layer 31, a filling rope 32, an inner lining layer 33, an armor layer 34 and an outer lining layer 4 from the inside to the outside. The core layer 31 is composed of a conductor 311 and an insulating layer 312. The filling rope 32 is located between the core layer 31 and the inner lining layer 33. The outer lining layer 4 is coated on the outside of the armor layer 34 and is located on the inside of the outer sheath 2. The material of the outer lining layer 4 is the same as that of the inner lining layer 33.

[0032] See also Figure 2 and Figure 3 As shown, the hot and cold adjustment component 5 is located between the outer lining 4 and the outer sheath 2, and includes an inner adjustment ring 51 sleeved on the outer lining 4 and an outer adjustment ring 52 in contact with the inner wall of the outer sheath 2. The inner adjustment ring 51 includes a plurality of circumferentially evenly distributed inner adjustment plates 511, and the inner adjustment plates 511 extend along the length direction of the cable body 1. The outer adjustment ring 52 includes a plurality of circumferentially evenly distributed outer adjustment plates 521, and the outer adjustment plates 521 extend along the length direction of the cable body 1. An elastic sheet 53 is fixedly connected between every two corresponding outer adjustment plates 521 and the inner adjustment plates 511.

[0033] When the cable body 1 undergoes thermal expansion, the hot and cold adjustment component 5 can alleviate and offset the expansion force of the cable core 3 and the outer sheath 2, preventing the expansion force of the cable core 3 from acting entirely on the outer sheath 2, thereby reducing the mechanical stress on the outer sheath 2.

[0034] See also Figure 3 As shown, the two ends of the elastic sheet 53 are fixedly connected to the middle of the inner adjustment plate 511 and the middle of the outer adjustment plate 521 respectively. In this embodiment, the cross-section of the elastic sheet 53 is a "C"-shaped structure. When the cable body 1 is in a thermal expansion state, the outer adjustment plates 521 and the inner adjustment plates 511 that are opposite to each other approach each other, so that the elastic sheet 53 is compressed. When the cable body 1 is in a cold contraction state, the outer adjustment plate 521 compresses the elastic sheet 53 to make the inner adjustment plate 511 slide on the circumferential side of the outer lining 4.

[0035] During use, when the outside temperature is high and the cable body 1 is energized, the resistance loss caused by the current passing through the conductor 311 will further increase the temperature of the cable core 3, and the conductor 311 and the insulating material in the entire cable body 1 will undergo thermal expansion effects. When the outer sheath 2 and the cable core 3 undergo thermal expansion, the outer adjustment plate 521, the inner adjustment plate 511 and the elastic sheet 53 can buffer the expansion force of the outer sheath 2 and the cable core 3, thereby preventing the cable core 3 from causing greater mechanical stress to the outer sheath 2.

[0036] In summary, through the settings of the outer adjustment plate 521, the inner adjustment plate 511 and the elastic sheet 53, when the cable core 3 and the outer sheath 2 undergo thermal expansion at the same time, the elastic sheet 53 can alleviate and offset the expansion force on the inner and outer sides, thereby preventing the cable core 3 from causing excessive mechanical stress on the outer sheath 2 and improving the service life of the outer sheath 2.

[0037] Example 2 In order to prevent the influence of thermal expansion and contraction on the cable body 1, the degree of contraction of the cable body 1 is improved to prevent the large contraction amount from generating large mechanical stress.

[0038] See also Figure 3 As shown, the inner side surface of the inner adjustment plate 511 is an arc-shaped structure and is in contact with the outer lining 4, and the contact surface between each inner adjustment plate 511 and the outer lining 4 is provided with an insulation layer 54. In this embodiment, the insulation layer 54 is made of tin foil, which not only has an excellent insulation effect, but also can reduce the friction between the inner adjustment plate 511 and the outer lining 4, so that multiple inner adjustment plates 511 can slide more smoothly on the outer lining 4.

[0039] See also Figure 3 and Figure 5 As shown, a plurality of first elastic bands 55 are arranged between two adjacent inner adjustment plates 511, and the plurality of first elastic bands 55 are equidistantly distributed along the length direction of the cable body 1, and a heat overflow gap is formed between two adjacent first elastic bands 55, and the two sides of the first elastic band 55 are respectively fixedly connected to the two adjacent inner adjustment plates 511, and the first elastic band 55 is in a stretched state and the contraction direction is consistent with the contraction direction of the two adjacent inner adjustment plates 511, so as to assist the plurality of inner adjustment plates 511 to approach each other.

[0040] See also Figure 3 As shown, a second elastic band 56 is provided between two adjacent outer adjustment plates 521, and the two sides of the second elastic band 56 are respectively fixedly connected to the two adjacent outer adjustment plates 521, and the second elastic band 56 is in a stretched state and the contraction direction is consistent with the contraction direction of the two adjacent outer adjustment plates 521, so as to assist the multiple outer adjustment plates 521 to approach each other.

[0041] It should be noted that after the cold and hot adjustment component 5 is sleeved on the outer lining 4, the first elastic band 55 and the second elastic band 56 are both in a stretched state. The first elastic band 55 makes the two adjacent inner adjustment plates 511 tend to approach each other, and the second elastic band 56 makes the two adjacent outer adjustment plates 521 tend to approach each other. When the cable body 1 is in the cold shrinkage stage, the first elastic band 55 and the second elastic band 56 assist the contraction of multiple inner adjustment plates 511 and outer adjustment plates 521.

[0042] In use, when the cable body 1 is cold-shrunk, the temperature of the outer sheath 2 is first reduced and begins to cold-shrunk. During the cold-shrunk process, the outer adjustment plate 521 compresses the elastic sheet 53 and makes the multiple inner adjustment plates 511 approach each other. Since the cross-section of the elastic sheet 53 is C-shaped, when the inner adjustment plates 511 are close to each other, the elastic sheet 53 can assist the multiple inner adjustment plates 511 to move. When the multiple inner adjustment plates 511 move to the maximum extent, the insulation layer 54 on the inner adjustment plates 511 can keep the cable core 3 warm and reduce the heat overflow of the cable core 3. At the same time, when the multiple inner adjustment plates 511 are close to each other to the maximum extent, since the first elastic band 55 has a certain thickness and the first elastic band 55 is in a bent state, a heat overflow gap is formed between every two adjacent inner adjustment plates 511, so that the heat of the cable core 3 can be dissipated to the inner wall of the outer sheath 2, thereby improving the shrinkage of the outer sheath 2.

[0043] In summary, through the settings of the inner adjustment plate 511, the insulation layer 54, the elastic sheet 53 and the outer adjustment plate 521, when the outer sheath 2 begins to shrink after the external temperature drops, the inner adjustment plate 511 is squeezed by the outer sheath 2 and begins to approach each other, and the heat overflow gap gradually shrinks until the inner adjustment plate 511 moves to the maximum extent. At this time, the heat overflow gap reaches the minimum state. At this time, the insulation layer 54 arranged on the inner adjustment plate 511 insulates the cable core 3 to reduce the shrinkage of the cable core 3. At the same time, because the cable core 3 is always in an energized state, the heat inside the cable core 3 is always accumulating, and a part of the heat is conducted to the inner wall of the outer sheath 2 through the heat overflow gap, so that the shrinkage of the outer sheath 2 is also improved, avoiding the large shrinkage causing the cable body 1 to produce large mechanical stress, thereby improving the service life of the outer sheath 2.

[0044] Example 3 In actual use, it was found that for the outer sheath 2 and the insulating layer 312 of the cable, long-term exposure to ultraviolet rays will cause the molecular chains to break, making the material hard and brittle, the color faded, and even cracked; the effect of blocking ultraviolet rays by changing the color of the material is relatively limited, and aging, hardening and cracking will occur after long-term use. Once cracks occur on the surface of the cable, moisture may penetrate into the interior of the cable, causing corrosion of the conductor 311, a decrease in insulation resistance, and other problems; further improvements are made on the basis of the above embodiments.

[0045] See also Figure 3 As shown, the outer side surface of each outer adjustment plate 521 is arc-shaped and consistent with the curvature of the inner wall of the outer sheath 2, and the outer side surface of the outer adjustment plate 521 is provided with a first waterproof layer 57.

[0046] A second waterproof layer 58 is disposed on the outer side of each second elastic band 56 .

[0047] The first waterproof layer 57 and the second waterproof layer 58 can swell in water and have bright colors.

[0048] It should be added that the first waterproof layer 57 and the second waterproof layer 58 can be made of different waterproof materials. In the present embodiment, the first waterproof layer 57 is made of water-swellable rubber, and its color is red. The second waterproof layer 58 is made of bentonite or hydrogel. Both of them will swell when they come into contact with water. When the cracks are small, bentonite and hydrogel can also fill the small gaps.

[0049] During use, when the outer sheath 2 cracks under strong ultraviolet rays, rainwater enters the interior of the cable body 1 through the cracks. At this time, the first waterproof layer 57 and the second waterproof layer 58 swell when exposed to water and repair the cracks. The repair methods of the first waterproof layer 57 and the second waterproof layer 58 are different. The first waterproof layer 57 uses water-swellable rubber, which not only can swell when exposed to water, but also will not affect the waterproof performance due to friction with the inner wall of the outer sheath 2. When the second waterproof layer 58 swells when exposed to water, the deformation it produces can repair smaller cracks.

[0050] In summary, through the arrangement of the first waterproof layer 57 and the second waterproof layer 58, when cracks occur on the surface of the outer sheath 2, the first waterproof layer 57 and the second waterproof layer 58 swell when exposed to water to repair the cracks. During the repair, since the color of the repair material is brighter, the maintenance workers can judge where the cracks occur by the color of the cable surface.

[0051] Example 4 The winding directions of the first elastic band 55 and the second elastic band 56 are further restricted to prevent the first elastic band 55 from affecting the maximum movement of the inner adjustment plate 511, and to avoid the friction between the second waterproof layer 58 and the outer sheath 2, which may cause the second waterproof layer 58 to fail prematurely.

[0052] See also Figure 3 As shown, a third elastic band 59 is provided between the adjacent first elastic bands 55 and the second elastic bands 56. The third elastic band 59 is in a stretched state and the stretching direction is consistent with the radial direction of the cable body 1. The third elastic band 59 brings the first elastic band 55 and the second elastic band 56 closer to each other to prevent the second waterproof layer 58 from rubbing against the inner wall of the outer sheath 2.

[0053] When in use, the third elastic band 59 can pull the first elastic band 55 and the second elastic band 56. When the inner adjustment plates 511 are close to each other, multiple third elastic bands 59 make the corresponding second elastic bands 56 move away from the outer lining layer 4 to prevent part of the second elastic bands 56 from piling up when winding. At the same time, under the action of the third elastic bands 59, the second elastic band 56 always maintains a certain gap with the inner wall of the outer sheath 2 to prevent the second waterproof layer 58 from being worn away.

[0054] In summary, by setting the third elastic band 59, the winding directions of the multiple first elastic bands 55 are unified, which prevents some of the first elastic bands 55 from piling up during winding and affecting the movement of the multiple inner adjustment plates 511. At the same time, the second elastic band 56 always maintains a certain gap with the inner wall of the outer sheath 2 under the pulling of the third elastic band 59, thereby avoiding the second waterproof layer 58 and the outer sheath 2 from being worn and failing.

[0055] Example 5 A method for preparing a weather-resistant radiation-proof cable comprises the following steps: Step 1: Conductor 311 is manufactured. At room temperature, a copper rod is drawn into a copper wire. The copper wire is heated and maintained at 500-600° C. for two hours. The copper wire is then twisted into a copper strand by twisting multiple single wires.

[0056] Step 2: Coating the insulation layer 312 , using a traction machine to pull the copper strands and coat them with cross-linked polyethylene to obtain a core wire layer 31 .

[0057] Step three: extruding the inner lining layer 33 , the inner lining layer 33 is extruded by an extruder and wrapped on the multiple core wire layers 31 , the core wire layers 31 are positioned during wrapping, and a filling rope 32 is added between the core wire layer 31 and the inner lining layer 33 .

[0058] Step 4: Arrange the armor layer 34 , wrap the steel wires around the outer side of the inner lining layer 33 in a back-twisting manner, so that each steel wire fits tightly together to form the armor layer 34 .

[0059] Step 5: Extrusion of the outer lining layer 4: The outer lining layer 4 is extruded by an extruder and wrapped on the armor layer 34.

[0060] Step 6: Set the hot and cold regulating assembly 5 , sleeve the hot and cold regulating assembly 5 on the outer lining layer 4 and make the inner regulating ring 51 contact with the outer lining layer 4 .

[0061] Step 7: Extrusion of the outer sheath 2: The outer sheath 2 is extruded by an extruder and wrapped around the outer side of the outer adjustment ring 52 to obtain the cable body 1.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A weather-resistant and radiation-proof cable, comprising a cable body, characterized in that: The cable body includes an outer sheath; and a cable core, wherein the cable core comprises a core layer, a filling rope, an inner lining layer, an armor layer and an outer lining layer from inside to outside, the core layer is composed of a conductor and an insulating layer, the filling rope is located between the core layer and the inner lining layer, and the outer lining layer is coated on the outer side of the armor layer and located on the inner side of the outer sheath; A hot and cold regulating component is located between the outer lining and the outer sheath, the hot and cold regulating component includes an inner adjusting ring sleeved on the outer lining and an outer adjusting ring in contact with the inner wall of the outer sheath, the inner adjusting ring includes a plurality of inner adjusting plates evenly distributed around the circumference, and the inner adjusting plates extend along the length direction of the cable body, the outer adjusting ring includes a plurality of outer adjusting plates evenly distributed around the circumference, and the outer adjusting plates extend along the length direction of the cable body, and an elastic sheet is fixedly connected between every two corresponding outer adjusting plates and inner adjusting plates.

2. A weather-resistant and radiation-proof cable according to claim 1, characterized in that: The two ends of the elastic sheet are fixedly connected to the inner adjustment plate and the outer adjustment plate respectively. When the cable body is in a thermal expansion state, the outer adjustment plate and the inner adjustment plate opposite to each other approach each other, so that the elastic sheet is compressed. When the cable body is in a cold contraction state, the outer adjustment plate compresses the elastic sheet to make the inner adjustment plate slide on the circumferential side of the outer lining.

3. A weather-resistant and radiation-proof cable according to claim 2, characterized in that: The inner side surface of the inner adjustment plate is an arc-shaped structure and fits with the outer lining layer, and each contact surface between the inner adjustment plate and the outer lining layer is provided with a heat-insulating layer.

4. A weather-resistant and radiation-proof cable according to claim 3, characterized in that: A plurality of first elastic bands are arranged between two adjacent inner adjustment plates, and the plurality of first elastic bands are equidistantly distributed along the length direction of the cable body, and a heat overflow gap is formed between two adjacent first elastic bands. The two sides of the first elastic band are respectively fixedly connected to the two adjacent inner adjustment plates. The first elastic band is in a stretched state and the contraction direction is consistent with the contraction direction of the two adjacent inner adjustment plates, so as to assist the plurality of inner adjustment plates to approach each other.

5. A weather-resistant and radiation-proof cable according to claim 4, characterized in that: A second elastic band is arranged between two adjacent outer adjustment plates, and the two sides of the second elastic band are respectively fixedly connected to the two adjacent outer adjustment plates. The second elastic band is in a stretched state and its contraction direction is consistent with the contraction direction of the two adjacent outer adjustment plates, so as to assist multiple outer adjustment plates to approach each other.

6. A weather-resistant and radiation-proof cable according to claim 5, characterized in that: The outer side surface of each outer adjustment plate is arc-shaped and consistent with the curvature of the inner wall of the outer sheath, and the outer side surface of the outer adjustment plate is provided with a first waterproof layer.

7. A weather-resistant and radiation-proof cable according to claim 6, characterized in that: The outer side of each of the second elastic bands is provided with a second waterproof layer.

8. The weather-resistant and radiation-proof cable according to claim 7, characterized in that: The first waterproof layer and the second waterproof layer can swell when exposed to water.

9. The weather-resistant and radiation-proof cable according to claim 8, characterized in that: A third elastic band is arranged between the first and second elastic bands adjacent to each other. The third elastic band is in a stretched state and the stretching direction is consistent with the radial direction of the cable body. The third elastic band brings the first elastic band and the second elastic band closer to each other.

10. A method for preparing a weather-resistant and radiation-proof cable, used for manufacturing a weather-resistant and radiation-proof cable according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Conductor manufacturing: at room temperature, the copper rod is drawn into a copper wire, and then the copper wire is heated and maintained at 500-600°C for two hours, and then the copper wire is twisted by twisting multiple single wires to form a copper stranded wire; Step 2: Coating the insulation layer, using a traction machine to pull the copper stranded wire and coat it with cross-linked polyethylene to obtain a core wire layer; Step 3: Extrusion of the inner lining layer: the inner lining layer is extruded by an extruder and wrapped on multiple core wire layers. The core wire layer is positioned during wrapping, and a filling rope is added between the core wire layer and the inner lining layer; Step 4: Set the armor layer, wrap the steel wires around the outer side of the inner lining layer in a back-twisting manner, so that each steel wire fits tightly together to form an armor layer; Step 5: Extrusion of the outer lining layer: the outer lining layer is extruded by an extruder and wrapped on the armor layer; Step 6: Set the hot and cold adjustment component, put the hot and cold adjustment component on the outer lining layer and make the inner adjustment ring contact with the outer lining layer; Step 7: Extrusion of the outer sheath: The outer sheath is extruded by an extruder and wrapped around the outer side of the outer adjustment ring to obtain the cable body.

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