A highly flame-retardant and highly wear-resistant power cable

Abstract

The present invention discloses a highly flame-retardant and highly wear-resistant power cable, which relates to the technical field of cables. A support layer is sleeved on the surface of the inner insulating layer. Installation ring grooves are equidistantly arranged on the surface wall of the support layer. Arc-shaped support bars are embedded in the interior of the installation ring grooves. The present invention utilizes the arc-shaped support bars to be embedded in the interior of the installation ring grooves and surround the outside of the core inside the cable, playing a role in supporting and protecting the core, improving the structural strength inside the cable, and preventing the core from being extruded and deformed to affect the normal power transmission. Moreover, the fitting installation method of the inner splicing block and the outer splicing block is simple, making the method of clamping the arc-shaped support bar outside the core simple. At the same time, the buffer hollow layer is used to buffer and protect the inside of the cable, and the external extrusion and impact forces are absorbed by the buffer viscous liquid filled in the buffer hollow layer, preventing the external pressure from directly impacting the core and further playing a role in protecting the core.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly to a highly flame-retardant and highly wear-resistant power cable. Background Art

[0002] A power cable is a cable used for transmitting and distributing electric energy. Power cables are commonly used in urban underground power grids, outgoing lines from power stations, internal power supply in industrial and mining enterprises, and underwater transmission lines across rivers and seas. In power lines, the proportion of cables is gradually increasing. A power cable is a cable product used to transmit and distribute high-power electric energy in the main lines of the power system, including power cables of various voltage levels from 1 - 500 kV and above, and various insulations.

[0003] However, currently, during the use of cables, the core inside lacks protection, has low structural strength, is prone to deformation when subjected to external extrusion and impact, and its transmission ability will be affected after the core deforms, resulting in the transmission circuit being unable to be used normally. Therefore, the present invention provides a highly flame-retardant and highly wear-resistant power cable to meet people's needs. Summary of the Invention

[0004] The present invention provides a highly flame-retardant and highly wear-resistant power cable, which can effectively solve the problems raised in the above background art that during the use of the cable, the core inside lacks protection, has low structural strength, is prone to deformation when subjected to external extrusion and impact, and its transmission ability will be affected after the core deforms, resulting in the transmission circuit being unable to be used normally.

[0005] To achieve the above object, the present invention provides the following technical solution: A highly flame-retardant and highly wear-resistant power cable, including a core. A shielding layer is sleeved on the surface of the core. An inner insulating layer is extrusion-mounted on the surface of the shielding layer. An outer insulating layer is sleeved outside the inner insulating layer. A protection and buffering mechanism is installed on the surface of the inner insulating layer.

[0006] The protection and buffering mechanism includes a support layer;

[0007] A support layer is sleeved on the surface of the inner insulating layer. Installation ring grooves are equidistantly arranged on the surface of the support layer. Arc-shaped support bars are embedded in the installation ring grooves. An inner splicing block is fixedly connected to the bottom of one end of the arc-shaped support bar. An outer splicing block is fixedly connected to the top of the other end of the arc-shaped support bar.

[0008] A shaping layer is sleeved on the surface of the support layer. A waterproof layer is covered and installed on the surface of the shaping layer. A buffer hollow layer is sleeved on the surface of the waterproof layer. Partition bars are equidistantly installed outside the buffer hollow layer. A sealing layer is adhesively installed on the surface of the buffer hollow layer.

[0009] The surface of the sealing layer is provided with through grooves at equal intervals, an elastic frame is installed at equal intervals at positions on the surface of the sealing layer corresponding to the through grooves, an extrusion pad is installed on the surface of the sealing layer at a position on one side of the elastic frame, one end of the extrusion pad is fixedly connected to the sealing pad, a locking layer is sleeved on the outer side of the sealing layer, and a separation layer is sleeved on the surface of the locking layer.

[0010] According to the above technical solution, the inner splicing block is tightly attached to the inner side of the outer splicing block, the arc-shaped support strip is surrounded to form a ring, and the surface wall of the arc-shaped support strip is flush with the surface of the support layer.

[0011] According to the above technical solution, the partition strips divide the interior of the buffer hollow layer into a plurality of cavities at equal intervals, and the interior of the cavities is filled with buffer viscous liquid.

[0012] According to the above technical solution, the two sides of the elastic frame are arc-shaped, and the bottom end of the elastic frame passes through the through slot and extends to the inside of the buffer hollow layer.

[0013] According to the above technical solution, the compression pads and the elastic frame are staggered, the edges of the compression pads and the edges of the elastic frame are in contact with each other, and the gap inside the locking layer is filled with a sealing pad.

[0014] According to the above technical solution, a flame retardant and wear-resistant mechanism is installed on the inner side of the outer insulating layer;

[0015] The flame retardant and wear resistant structure comprises a flame retardant hollow layer;

[0016] A flame-retardant hollow layer is installed on the inner side of the outer insulating layer, partition strips are fixedly installed at equal intervals on the outside of the flame-retardant hollow layer, a rubber layer is sleeved on the surface of the flame-retardant hollow layer, the surface of the top of the rubber layer is covered with an upper metal interception net, the surface of the bottom of the rubber layer is covered with a lower metal interception net, ceramic fiber strips are fixedly installed between both ends of the upper and lower metal interception nets, a mounting strip is installed in the middle of the ceramic fiber strips, a metal protective shell is covered on the surface of the ceramic fiber strips, a covering layer is tightly installed on the inner wall of the outer insulating layer, a protective layer is tightly installed on the inner wall of the flame-retardant hollow layer, and a filling layer is tightly installed on the inner wall of the protective layer;

[0017] Positioning strips are symmetrically installed at both ends of the surface of the outer insulation layer, and positioning grooves are equidistantly provided at the bottom and top of the positioning strips. Upper arc-shaped wear-resistant blocks are equidistantly installed at the top of the surface of the outer insulation layer, and lower arc-shaped wear-resistant blocks are equidistantly installed at the bottom of the surface of the outer insulation layer. Positioning blocks are fixedly connected at both ends of the bottom of the upper arc-shaped wear-resistant block and both ends of the top of the lower arc-shaped wear-resistant block.

[0018] According to the above technical solution, the partition strip equally divides the interior of the flame-retardant hollow layer into a plurality of storage cavities. The interior of the storage cavities is filled with crushed sand and gravel, and the rubber layer closely adheres to the surface of the crushed sand and gravel.

[0019] According to the above technical solution, the upper metal intercepting net and the lower metal intercepting net are fixedly connected through two ceramic fiber strips. The upper metal intercepting net, the lower metal intercepting net and the two ceramic fiber strips are spliced into a circular ring, which closely adheres to the surface wall of the rubber layer.

[0020] According to the above technical solution, the metal protective shell covers the ceramic fiber strips. Grooves are provided inside the covering layer. The metal protective shell is movably embedded inside the grooves. The covering layer closely adheres to the surfaces of the upper metal intercepting net and the lower metal intercepting net. The filling layer is sleeved on the surface of the partition layer.

[0021] According to the above technical solution, the upper arc-shaped wear-resistant block and the lower arc-shaped wear-resistant block are in one-to-one correspondence. The positioning blocks at the bottoms of the upper arc-shaped wear-resistant block and the lower arc-shaped wear-resistant block are both movably embedded inside the positioning grooves.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: The structure of the present invention is scientific and reasonable, and it is safe and convenient to use:

[0023] 1. A protection and buffer mechanism is provided. The arc-shaped support strip is embedded and installed inside the installation ring groove, surrounding the outer side of the core inside the cable, playing a role in supporting and protecting the core, improving the structural strength inside the cable, preventing the core from being extruded and deformed and affecting the normal power transmission. The fitting and installation method of the inner splicing block and the outer splicing block is simple, making it easy to snap the arc-shaped support strip on the outer side of the core.

[0024] At the same time, the buffer hollow layer is used to buffer and protect the inside of the cable. The external extrusion and impact forces are absorbed by the buffer viscous liquid filled inside the buffer hollow layer, preventing the external pressure from directly impacting the core, further playing a role in protecting the core. Moreover, the internal space of the buffer hollow layer is separated by the partition strip, so that when the cable is cut, the buffer viscous liquid inside it will not all leak.

[0025] 2. Utilizing the deformable ability of the elastic frame, when being squeezed, the buffer viscous liquid inside the buffer hollow layer will enter the elastic frame and be squeezed by it. The two sides of the elastic frame remain arc-shaped, and the deformed and expanded space after being squeezed enables the squeezed and impacted buffer viscous liquid to flow and buffer, improving the buffering effect, preventing the buffer hollow layer from being broken through by strong extrusion and impact. The extrusion pad plays a role in resetting the elasticity. After being squeezed and deformed by the elastic frame, it will reset and expand. At the same time, the waterproof layer protects the inner side of the buffer hollow layer to prevent the liquid inside it from penetrating into the cable.

[0026] 3. A flame-retardant and wear-resistant mechanism is provided. The flame-retardant hollow layer is filled with crushed sand and gravel to achieve the flame-retardant effect. After being heated, the rubber layer is dissolved and adheres and penetrates into the crushed sand and gravel, making the direct adhesion between the crushed sand and gravel stronger, filling the gaps between the crushed sand and gravel, and thus reducing the heat transfer to the inside of the cable. At the same time, the upper metal intercepting net and the lower metal intercepting net cover the outside, intercept and protect it, and prevent the crushed sand and gravel from falling;

[0027] When the ceramic fiber strips contract after being heated, they can pull the upper metal intercepting net and the lower metal intercepting net to contract. Thus, after the rubber layer is dissolved, the intercepting range can be reduced, and it always closely adheres to the outside of the crushed sand and gravel. The metal protective shell protects the ceramic fiber strips from being directly burned by fire and causing their fracture. Therefore, the upper metal intercepting net, the lower metal intercepting net, the crushed sand and gravel, and the flame-retardant hollow layer form a multi-layer flame-retardant structure, preventing the external fire from quickly burning into the inside of the cable, preventing the cable from being quickly ignited when on fire and causing damage to the circuit. The high flame-retardant effect can protect the internal core of the cable to be used normally, providing a certain transition time for the staff to extinguish the fire and replace the cable, and keeping the transmission line in normal use.

[0028] 4. By directly embedding the positioning blocks into the positioning grooves, the upper arc-shaped wear-resistant block and the lower arc-shaped wear-resistant block are positioned and installed. The upper arc-shaped wear-resistant block and the lower arc-shaped wear-resistant block wrap the surface of the outer insulation layer of the cable and are in contact with the installation and placement plane. Therefore, when installing and pulling, both the upper arc-shaped wear-resistant block and the lower arc-shaped wear-resistant block generate friction with the ground, protecting the surface of the cable, improving the overall wear-resistant effect of the cable, preventing the surface of the cable from being worn, and the positioning blocks are closely attached to the inner wall of the positioning grooves, generating friction force, so that the upper arc-shaped wear-resistant block and the lower arc-shaped wear-resistant block will not easily fall off, and the installation method is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0030] In the drawings:

[0031] Figure 1 is a schematic structural diagram of the present invention;

[0032] Figure 2 is a schematic cross-sectional structural diagram of the cable of the present invention;

[0033] Figure 3 is a schematic installation structural diagram of the filling layer of the present invention;

[0034] Figure 4 is a schematic installation structural diagram of the covering layer of the present invention;

[0035] Figure 5It is a schematic structural diagram of the flame-retardant and wear-resistant mechanism of the present invention;

[0036] Figure 6 It is a schematic installation structure diagram of the partition strip of the present invention;

[0037] Figure 7 It is a schematic installation structure diagram of the partition layer of the present invention;

[0038] Figure 8 It is a schematic structural diagram of the protection and buffer mechanism of the present invention;

[0039] Figure 9 It is a schematic installation structure diagram of the partition bar of the present invention;

[0040] Figure 10 It is a schematic installation structure diagram of the arc support bar of the present invention;

[0041] Figure 11 It is the present invention Figure 3 Schematic diagram of the structure of area A;

[0042] Figure 12 It is the present invention Figure 5 Schematic diagram of the structure of area B;

[0043] Figure 13 It is the present invention Figure 8 Schematic diagram of the structure of area C;

[0044] Figure 14 It is the present invention Figure 10 Schematic diagram of the structure of area D;

[0045] Reference numerals in the figure: 1, core body; 2, shielding layer; 3, inner insulating layer; 4, outer insulating layer;

[0046] 5, protection and buffer mechanism; 501, support layer; 502, installation ring groove; 503, arc support bar; 504, inner splicing block; 505, outer splicing block; 506, shaping layer; 507, waterproof layer; 508, buffer hollow layer; 509, partition bar; 510, sealing layer; 511, through groove; 512, elastic frame; 513, extrusion pad; 514, sealing pad; 515, locking layer; 516, partition layer;

[0047] 6, flame-retardant and wear-resistant mechanism; 601, flame-retardant hollow layer; 602, partition strip; 603, rubber layer; 604, upper metal interception net; 605, lower metal interception net; 606, ceramic fiber strip; 607, installation strip; 608, metal protective shell; 609, covering layer; 610, protective layer; 611, filling layer; 612, positioning long strip; 613, positioning groove; 614, upper arc wear-resistant block; 615, lower arc wear-resistant block; 616, positioning block. Detailed implementation manners

[0048] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only for illustrating and explaining the present invention, and are not used to limit the present invention.

[0049] Embodiment: As Figures 1-14 shown, the present invention provides a technical solution, a highly flame-retardant and highly wear-resistant power cable, which includes a core body 1, a shielding layer 2 is sleeved on the surface of the core body 1, an inner insulating layer 3 is extrusion-mounted on the outer wall of the shielding layer 2, an outer insulating layer 4 is sleeved outside the inner insulating layer 3, and a protection buffer mechanism 5 is installed on the surface of the inner insulating layer 3;

[0050] The protection buffer mechanism 5 includes a support layer 501, an installation ring groove 502, an arc-shaped support bar 503, an inner splicing block 504, an outer splicing block 505, a shaping layer 506, a waterproof layer 507, a buffer hollow layer 508, a partition strip 509, a sealing layer 510, a through groove 511, an elastic frame 512, an extrusion pad 513, a sealing pad 514, a locking layer 515 and a partition layer 516;

[0051] A support layer 501 is sleeved and installed on the surface of the inner insulating layer 3. Installation ring grooves 502 are equidistantly formed on the surface wall of the support layer 501. Arc-shaped support bars 503 are embedded and installed inside the installation ring grooves 502. A inner splicing block 504 is fixedly connected to the bottom of one end of the arc-shaped support bar 503. An outer splicing block 505 is fixedly connected to the top of the other end of the arc-shaped support bar 503. The inner splicing block 504 is closely attached to the inner side of the outer splicing block 505. The arc-shaped support bars 503 are surrounded to form a ring. The surface wall of the arc-shaped support bar 503 is flush with the surface of the support layer 501. A shaping layer 506 is sleeved on the surface of the support layer 501. A waterproof layer 507 is covered and installed on the surface of the shaping layer 506. A buffer hollow layer 508 is sleeved on the surface of the waterproof layer 507. Partition bars 509 are equidistantly installed on the outside of the buffer hollow layer 508. The partition bars 509 equally divide the inside of the buffer hollow layer 508 into multiple cavities. Buffer viscous liquid is filled in the cavities. A sealing layer 510 is adhesively installed on the surface of the buffer hollow layer 508. Through grooves 511 are equidistantly formed on the surface of the sealing layer 510. Elastic frames 512 are equidistantly installed at positions corresponding to the through grooves 511 on the surface of the sealing layer 510. Both sides of the elastic frame 512 are arc-shaped. The bottom end of the elastic frame 512 passes through the through groove 511 and extends to the inside of the buffer hollow layer 508. An extrusion pad 513 is installed at a position on the surface of the sealing layer 510 on one side of the elastic frame 512. A sealing pad 514 is fixedly connected to one end of the extrusion pad 513. A locking layer 515 is sleeved and installed on the outside of the sealing layer 510. The extrusion pads 513 and the elastic frames 512 are distributed alternately. The side edges of the extrusion pads 513 and the side edges of the elastic frames 512 are in contact with each other. The inner void of the locking layer 515 is filled with the sealing pad 514. A partition layer 516 is sleeved on the surface of the locking layer 515. By embedding the arc-shaped support bars 503 inside the installation ring grooves 502 and surrounding the outer side of the core 1 inside the cable, it plays a role in supporting and protecting the core 1, improves the structural strength inside the cable, and prevents the core 1 from being extruded and deformed to affect the normal power transmission. The fitting installation method of the inner splicing block 504 and the outer splicing block 505 is simple, making the way of clamping the arc-shaped support bars 503 on the outer side of the core 1 simple;

[0052] At the same time, the buffer hollow layer 508 is used to buffer and protect the inside of the cable. The external extrusion and impact forces are absorbed by the buffer viscous liquid filled inside the buffer hollow layer 508, preventing the external pressure from directly impacting the core 1, further playing a role in protecting the core 1. Moreover, the internal space of the buffer hollow layer 508 is separated by the partition bars 509, so that when the cable is cut, the buffer viscous liquid inside it will not all leak;

[0053] Utilizing the deformable ability of the elastic frame 512, when being squeezed, the buffer viscous liquid inside the buffer hollow layer 508 will enter the elastic frame 512 and squeeze it. The two sides of the elastic frame 512 remain arc-shaped, and the deformed and expanded space after being squeezed enables the buffer viscous liquid under the squeezing impact to flow and buffer, improving the buffering effect and preventing the buffer hollow layer 508 from being broken through by strong squeezing and impact. The extrusion pad 513 plays a role in resetting elasticity. After being deformed by the extrusion of the elastic frame 512, it will reset and expand. At the same time, the waterproof layer 507 protects the inner side of the buffer hollow layer 508 to prevent the liquid inside it from penetrating into the cable;

[0054] A flame-retardant and wear-resistant mechanism 6 is installed on the inner side of the outer insulation layer 4;

[0055] The flame-retardant and wear-resistant mechanism 6 includes a flame-retardant hollow layer 601, partition strips 602, rubber layers 603, upper metal interception nets 604, lower metal interception nets 605, ceramic fiber strips 606, installation strips 607, metal protective shells 608, covering layers 609, protective layers 610, filling layers 611, positioning long strips 612, positioning grooves 613, upper arc-shaped wear-resistant blocks 614, lower arc-shaped wear-resistant blocks 615 and positioning blocks 616;

[0056] A flame-retardant hollow layer 601 is installed inside the outer insulating layer 4. Partition strips 602 are fixedly installed at equal distances outside the flame-retardant hollow layer 601. A rubber layer 603 is sleeved on the surface of the flame-retardant hollow layer 601. The partition strips 602 equally divide the interior of the flame-retardant hollow layer 601 into multiple storage cavities. Crushed sand and gravel are filled inside the storage cavities. The rubber layer 603 is closely attached to the surface of the crushed sand and gravel. An upper metal interception net 604 is covered and installed on the surface at the top of the rubber layer 603. A lower metal interception net 605 is covered and installed on the surface at the bottom of the rubber layer 603. Ceramic fiber strips 606 are fixedly installed between the two ends of the upper metal interception net 604 and the lower metal interception net 605. The upper metal interception net 604 and the lower metal interception net 605 are fixedly connected by two ceramic fiber strips 606. The upper metal interception net 604, the lower metal interception net 605 and the two ceramic fiber strips 606 are spliced into a ring and closely attached to the outer wall of the rubber layer 603. An installation strip 607 is installed in the middle of the ceramic fiber strip 606. A metal protective shell 608 is covered and installed on the surface of the ceramic fiber strip 606. A covering layer 609 is closely attached to the inner wall of the outer insulating layer 4. A protective layer 610 is closely attached to the inner wall of the flame-retardant hollow layer 601. A filling layer 611 is closely attached and installed on the inner wall of the protective layer 610. The metal protective shell 608 covers the ceramic fiber strip 606. Grooves are formed inside the covering layer 609. The metal protective shell 608 is movably embedded inside the grooves. The covering layer 609 is closely attached to the surfaces of the upper metal interception net 604 and the lower metal interception net 605. The filling layer 611 is sleeved on the surface of the partition layer 516. The flame-retardant effect is achieved by filling crushed sand and gravel in the flame-retardant hollow layer 601. After being heated, the rubber layer 603 is dissolved and adheres and penetrates into the crushed sand and gravel, making the direct adhesion between the crushed sand and gravel stronger, filling the gaps between the crushed sand and gravel, and thus reducing the heat transfer to the inside of the cable. At the same time, the upper metal interception net 604 and the lower metal interception net 605 cover the outside, intercepting and protecting it to prevent the crushed sand and gravel from falling;

[0057] When the ceramic fiber strip 606 shrinks after being heated, it can pull the upper metal interception net 604 and the lower metal interception net 605 to shrink. Thus, after the rubber layer 603 is dissolved, the interception range can be reduced and it can always be closely attached to the outside of the crushed sand and gravel. The metal protective shell 608 protects the ceramic fiber strip 606 to prevent it from being directly burned by fire and causing its breakage. Thus, the upper metal interception net 604, the lower metal interception net 605, the crushed sand and gravel and the flame-retardant hollow layer 601 form a multi-layer flame-retardant structure, preventing the outside fire from quickly burning into the inside of the cable, preventing the cable from being quickly ignited when a fire breaks out and causing damage to the circuit. The high flame-retardant effect can protect the normal use of the inner core 1 of the cable, providing a certain transition time for the staff to extinguish the fire and replace the cable and keeping the transmission line in normal use;

[0058] At both ends of the surface of the outer insulation layer 4, positioning strips 612 are symmetrically installed. At equal intervals, positioning grooves 613 are provided at the bottom and top of the positioning strips 612. At equal intervals on the top surface of the outer insulation layer 4, upper arc-shaped wear-resistant blocks 614 are installed. At equal intervals on the bottom surface of the outer insulation layer 4, lower arc-shaped wear-resistant blocks 615 are installed. At both ends of the bottom of the upper arc-shaped wear-resistant blocks 614 and at both ends of the top of the lower arc-shaped wear-resistant blocks 615, positioning blocks 616 are fixedly connected. The upper arc-shaped wear-resistant blocks 614 and the lower arc-shaped wear-resistant blocks 615 are in one-to-one correspondence. The positioning blocks 616 at the bottom of the upper arc-shaped wear-resistant blocks 614 and at the bottom of the lower arc-shaped wear-resistant blocks 615 are both movably embedded in the interior of the positioning grooves 613. By directly embedding the positioning blocks 616 into the positioning grooves 613, the upper arc-shaped wear-resistant blocks 614 and the lower arc-shaped wear-resistant blocks 615 are positioned and installed. The upper arc-shaped wear-resistant blocks 614 and the lower arc-shaped wear-resistant blocks 615 are wrapped around the surface of the outer insulation layer 4 of the cable and are in contact with the installation and placement plane. Therefore, when installing and pulling, both the upper arc-shaped wear-resistant blocks 614 and the lower arc-shaped wear-resistant blocks 615 generate friction with the ground, protecting the surface of the cable, improving the overall wear-resistant effect of the cable, preventing the surface of the cable from being worn, and the inner walls of the positioning blocks 616 and the positioning grooves 613 are closely fitted to generate friction, so that the upper arc-shaped wear-resistant blocks 614 and the lower arc-shaped wear-resistant blocks 615 will not fall off easily, and the installation method is simple.

[0059] Among them, the extrusion pad 513 is an elastic rubber pad, the support layer 501 is formed by extrusion molding of hard rubber, the arc-shaped support strip 503 is made of aluminum alloy, and both the inner splicing block 504 and the outer splicing block 505 are made of the same material as the arc-shaped support strip 503 and are formed by pressing together with the arc-shaped support strip 503;

[0060] The material of the sealing layer 510 is sealing rubber, which fills and seals the corresponding gaps inside the locking layer 515. The locking layer 515 is formed by extrusion molding of rubber and plays a wrapping role, wrapping and shaping multiple structures such as the extrusion pad 513, the elastic frame 512, and the sealing pad 514. The partition layer 516 is made of PVC material and plays a partitioning role.

[0061] Working principle and usage process of the present invention: First, during the production of the cable, a shielding layer 2 and an inner insulating layer 3 are sequentially sleeved on the surface of the core body 1, and the support layer 501 is sleeved on the outer wall of the inner insulating layer 3. The arc-shaped support strips 503 are equidistantly sleeved on its surface and are exactly stuck inside the installation ring groove 502. The inner splicing block 504 at one end of the arc-shaped support strip 503 is inserted and fitted to the inner side of the outer splicing block 505, so that the arc-shaped support strips 503 form a ring. The shaping layer 506 and the waterproof layer 507 are sequentially extruded and sleeved on the surface of the support layer 501. The shaping layer 506 plays a role in shaping and protecting the arc-shaped support strips 503 to prevent them from loosening and falling. The buffer hollow layer 508 is sleeved on the surface of the waterproof layer 507, and the cavities separated by the partition strips 509 are all filled with buffer viscous liquid. The locking layer 515 and the partition layer 516 are sequentially sleeved on the surface of the gasket 514;

[0062] The protective layer 610 and the filling layer 611 are located at the middle position between the partition layer 516 and the flame-retardant hollow layer 601, filling and separating the distance between them. The storage cavities separated by the partition bars 602 inside the flame-retardant hollow layer 601 are filled with crushed sand and gravel, and the rubber layer 603 will wrap around the surface of the flame-retardant hollow layer 601. Then, the whole is wrapped and sleeved on the surface of the cable. The upper metal interception net 604 and the lower metal interception net 605 are respectively fitted to the top and bottom surfaces of the rubber layer 603, and the ceramic fiber strips 606 are used to connect and fix them. The metal protective shell 608 is fitted and covered on the surface of the ceramic fiber strips 606. Then, the covering layer 609 and the outer insulating layer 4 can be sleeved;

[0063] Next, take the upper arc-shaped wear-resistant block 614 and the lower arc-shaped wear-resistant block 615 and fit them to the surface of the outer insulating layer 4, and the positioning block 616 is inserted into the positioning groove 613, which plays a role in positioning and installing the upper arc-shaped wear-resistant block 614 and the lower arc-shaped wear-resistant block 615 to prevent them from falling off. When installing and placing the cable, the upper arc-shaped wear-resistant block 614 and the lower arc-shaped wear-resistant block 615 are in contact with the ground. When pulling and sliding the cable, the outer insulating layer 4 will not be worn;

[0064] During the use of the cable, the arc-shaped support strips 503 and the support layer 501 improve the internal structural strength, surround the outside of the core body 1, and protect it. When the cable is subjected to external extrusion and impact, the impact force will be absorbed by the buffer viscous liquid filled in the buffer hollow layer 508. At the same time, after the buffer viscous liquid is squeezed, it will flow to the other side that is not squeezed, enter the elastic frame 512 through the through groove 511. The two side parts of the elastic frame 512 are arc-shaped and deform when pushed by extrusion, pushing the extrusion pad 513 outwards to expand the space inside it for the buffer viscous liquid to flow, and absorb the impact force through the flowing liquid, playing a buffering role for the inside of the cable. And the elastic frames 512 are distributed in a surrounding manner, and buffer protection can be received from any angle of extrusion;

[0065] If a fire breaks out in the environment around the cable and the fire source burns the cable, burning the outer insulation layer 4 and the covering layer 609 on the surface of the cable completely, and the high temperature transfers inward, it will dissolve the rubber layer 603. With the interception of the upper metal interception net 604 and the lower metal interception net 605, it penetrates inward and integrates into the crushed sand and gravel inside the flame-retardant hollow layer 601, filling the gaps in the crushed sand and gravel. The ceramic fiber strip 606 will shrink when heated, pulling the upper metal interception net 604 and the lower metal interception net 605 closer to each other and fitting on the surface of the flame-retardant hollow layer 601 to intercept the crushed sand and gravel. The metal protective shell 608 can protect the ceramic fiber strip 606 from being burned off by fire. The upper metal interception net 604, the lower metal interception net 605, the crushed sand and gravel, and the flame-retardant hollow layer 601 all play a certain role in flame-retardant interception, preventing the fire source from spreading into the cable, and also playing a certain role in heat insulation. The buffer viscous liquid inside the buffer hollow layer 508 also plays a role in heat preservation and insulation, preventing the core 1 from being burned by fire or affected by high temperature. Thus, the core 1 can continue to operate, the corresponding circuit will not be damaged, providing a certain buffer transition time for subsequent maintenance and replacement by the staff.

[0066] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highly flame-retardant and highly wear-resistant power cable, comprising a core body (1), characterized in that: A shielding layer (2) is sleeved on the surface of the core body (1). An inner insulating layer (3) is extrusion-mounted on the outer wall of the shielding layer (2). An outer insulating layer (4) is sleeved outside the inner insulating layer (3). A protection and buffer mechanism (5) is installed on the surface of the inner insulating layer (3); The protection and buffer mechanism (5) includes a support layer (501); A support layer (501) is sleeved and installed on the surface of the inner insulating layer (3). Installation ring grooves (502) are equidistantly formed on the outer wall of the support layer (501). Arc-shaped support bars (503) are embedded in the installation ring grooves (502). A inner splicing block (504) is fixedly connected to the bottom of one end of the arc-shaped support bar (503). An outer splicing block (505) is fixedly connected to the top of the other end of the arc-shaped support bar (503); A shaping layer (506) is sleeved on the surface of the support layer (501). A waterproof layer (507) is covered and installed on the surface of the shaping layer (506). A buffer hollow layer (508) is sleeved on the surface of the waterproof layer (507). Partition bars (509) are equidistantly installed outside the buffer hollow layer (508). A sealing layer (510) is adhesively installed on the surface of the buffer hollow layer (508); Through grooves (511) are equidistantly formed on the surface of the sealing layer (510). Elastic frames (512) are equidistantly installed at positions corresponding to the through grooves (511) on the surface of the sealing layer (510). An extrusion pad (513) is installed on the surface of the sealing layer (510) at a position on one side of the elastic frame (512). A sealing pad (514) is fixedly connected to one end of the extrusion pad (513). A locking layer (515) is sleeved and installed outside the sealing layer (510). A partition layer (516) is sleeved on the surface of the locking layer (515); A flame-retardant and wear-resistant mechanism (6) is installed inside the outer insulating layer (4); The flame-retardant and wear-resistant mechanism (6) includes a flame-retardant hollow layer (601); A flame-retardant hollow layer (601) is installed inside the outer insulating layer (4). Partition bars (602) are equidistantly and fixedly installed outside the flame-retardant hollow layer (601). A rubber layer (603) is sleeved on the surface of the flame-retardant hollow layer (601). An upper metal interception net (604) is covered and installed on the surface of the top end of the rubber layer (603). A lower metal interception net (605) is covered and installed on the surface of the bottom end of the rubber layer (603). Ceramic fiber strips (606) are fixedly installed between both ends of the upper metal interception net (604) and the lower metal interception net (605). An installation bar (607) is installed in the middle of the ceramic fiber strip (606). A metal protective shell (608) is covered and installed on the surface of the ceramic fiber strip (606). A covering layer (609) is closely attached and installed on the inner wall of the outer insulating layer (4). A protective layer (610) is closely attached and installed on the inner wall of the flame-retardant hollow layer (601). A filling layer (611) is closely fitted and installed on the inner wall of the protective layer (610); Positioning strips (612) are symmetrically installed at both ends of the surface of the outer insulation layer (4). Positioning grooves (613) are equidistantly formed at the bottom and top of the positioning strips (612). Upper arc-shaped wear-resistant blocks (614) are equidistantly installed at the top of the surface of the outer insulation layer (4). Lower arc-shaped wear-resistant blocks (615) are equidistantly installed at the bottom of the surface of the outer insulation layer (4). Positioning blocks (616) are fixedly connected to both ends of the bottom of the upper arc-shaped wear-resistant blocks (614) and both ends of the top of the lower arc-shaped wear-resistant blocks (615).

2. A highly flame-retardant and highly wear-resistant power cable according to claim 1, characterized in that, The inner splicing block (504) is closely attached to the inner side of the outer splicing block (505). The arc-shaped support strips (503) surround to form a ring, and the surface of the arc-shaped support strips (503) is flush with the surface of the support layer (501).

3. A highly flame-retardant and highly wear-resistant power cable according to claim 1, characterized in that, The partition strips (509) equally divide the interior of the buffer hollow layer (508) into multiple cavities, and buffer viscous liquid is filled in the cavities.

4. A highly flame-retardant and highly wear-resistant power cable according to claim 1, characterized in that, Both side parts of the elastic frame (512) are arc-shaped, and the bottom end of the elastic frame (512) passes through the through groove (511) and extends into the interior of the buffer hollow layer (508).

5. A highly flame-retardant and highly wear-resistant power cable according to claim 1, characterized in that, The extrusion pads (513) and the elastic frames (512) are distributed alternately. The side parts of the extrusion pads (513) are in contact with the side parts of the elastic frames (512). A sealing pad (514) is filled in the inner gap of the locking layer (515).

6. A highly flame-retardant and highly wear-resistant power cable according to claim 1, characterized in that, The partition strips (602) equally divide the interior of the flame-retardant hollow layer (601) into multiple storage cavities, and crushed gravel is filled in the storage cavities. The rubber layer (603) is closely attached to the surface of the crushed gravel.

7. A highly flame-retardant and highly wear-resistant power cable according to claim 1, characterized in that, The upper metal interception net (604) and the lower metal interception net (605) are fixedly connected by two ceramic fiber strips (606). The upper metal interception net (604), the lower metal interception net (605) and the two ceramic fiber strips (606) are spliced into a ring and closely attached to the surface of the rubber layer (603).

8. A highly flame-retardant and highly wear-resistant power cable according to claim 1, characterized in that, The metal protective shell (608) covers the ceramic fiber strips (606). Grooves are formed in the interior of the covering layer (609). The metal protective shell (608) is movably embedded in the grooves. The covering layer (609) is closely attached to the surfaces of the upper metal interception net (604) and the lower metal interception net (605). The filling layer (611) is sleeved on the surface of the partition layer (516).

9. A highly flame-retardant and highly wear-resistant power cable according to claim 1, characterized in that, The upper arc-shaped wear-resistant blocks (614) and the lower arc-shaped wear-resistant blocks (615) are in one-to-one correspondence. The positioning blocks (616) at the bottom of the upper arc-shaped wear-resistant blocks (614) and the bottom of the lower arc-shaped wear-resistant blocks (615) are both movably embedded in the interior of the positioning grooves (613).

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