Mining composite protection long-life cable and preparation method thereof
Through composite structural design, when mining cables are used in mines, silicon carbide particles are used to enhance wear resistance, fluororubber is used to improve acid and alkali resistance, supporting cable core components are used to enhance bending resistance, and buffer components are used to provide impact protection. This solves the wear resistance, corrosion resistance and bending resistance problems of mining cables when used in mines and extends the service life of the cables.
Patent Information
- Application Number
- CN202510980669.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-16
- Publication Date
- 2025-10-03
AI Technical Summary
When used in mines, mining cables cannot meet the requirements of wear resistance, corrosion resistance and bending resistance, resulting in rapid wear, easy bending and breakage, and shortened service life.
It adopts a composite structure design, including an outer layer of silicon carbide particles to enhance wear resistance, a middle layer of fluororubber to improve acid and alkali resistance, supporting cable core components to enhance bending strength, buffer components and pre-buffer layers to provide impact protection, and the conductor uses silver-plated copper core wire to improve conductivity.
It significantly improves the cable's wear resistance, acid and alkali resistance, bending resistance and impact resistance, extends the cable's service life and reduces maintenance costs.
Smart Images
Figure CN120748822A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of cable technology, and in particular to a composite protective long-life cable for mining and a preparation method thereof. Background Art
[0002] The mining operating environment is harsh, and the power supply cables of underground mining equipment are exposed to moisture, acidic and alkaline media, and mechanical wear for a long time. Traditional mining cables mostly use a single rubber sheath or ordinary plastic sheath. Although they have certain insulation properties, they are insufficient in terms of wear resistance, corrosion resistance, and resistance to bending fatigue. In recent years, with the increase in mining equipment power and operating intensity, the reliability requirements of cables have been significantly improved. However, existing technologies have not yet effectively solved the problem of composite damage, resulting in frequent equipment shutdowns and maintenance, which seriously affects production efficiency. Currently, mining cables primarily utilize three types of protective solutions: First, pure rubber sheaths offer flexibility but poor abrasion resistance, with a wear rate as high as 0.8 mm / 1,000 hours; second, PVC sheaths, which are low-cost but offer poor acid and alkali resistance and are susceptible to aging in extreme pH environments; and third, armored cables, which offer high mechanical strength but are heavy and have poor bending properties. Furthermore, the conductors are often made of ordinary stranded copper wire, which lacks a bend-resistant design and is prone to breakage under frequent movement.
[0003] However, the internal conditions of mines are complex, so when mining cables are used in mines, they need to be frequently moved or bent to adapt to the internal conditions of the mines and facilitate people's use. However, when frequently moved or bent, since most of the existing mining cables are produced and prepared using the above-mentioned scheme, the cables cannot meet the requirements of wear resistance, corrosion resistance and bending resistance. This will cause the cables to wear out quickly when used in mines, and they will also break due to bending, which will greatly shorten the service life of the cables and is not conducive to people's use. Summary of the Invention
[0004] The purpose of this application is to solve the problem that the existing mining cables proposed in the above background technology cannot meet the requirements of wear resistance, corrosion resistance and bending resistance, which will cause the cables to wear out quickly when used in mines, and will also cause bending and breakage, which will greatly shorten the service life of the cables and is not conducive to people's use. This application provides a mining composite protective high-life cable and a preparation method thereof.
[0005] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A composite protective high-life cable for mining includes a middle layer, a supporting cable core member is fixedly connected to the middle of the middle layer, and a plurality of conductors are installed inside the middle layer, the outer side of the conductors is wrapped with an inner layer, the interior of the inner layer is filled with multiple groups of repair microcapsules, the multiple conductors are arranged in a square, and rebound strips are arranged between the conductors. A buffer component is provided on the outer side of the middle layer, the outer side of the buffer component is fixedly connected to the outer layer, and the outer side of the outer layer is fixedly connected to a pre-buffer layer.
[0006] By adopting the above technical solution, the silicon carbide particles inside the outer layer make the surface Rockwell hardness reach HRR120, and hard bumps are formed during wear to disperse the shear force, thereby improving the wear resistance index of the cable and reducing the daily wear of the cable; the middle layer is made of fluororubber material, the CF bond energy in its molecular chain is 485kJ / mol, which can resist the penetration of pH-14 media, further improving the acid and alkali resistance of the cable, thereby increasing the service life of the cable, and when using the cable, the internal components supporting the cable core can be used to enhance the comprehensive toughness strength of the cable and improve the bending strength of the cable, making the cable less likely to break in frequent moving scenarios or frequent bending, providing anti-bending protection for the cable, and further improving the comprehensive protective strength of the cable; When the cable is in use, when the cable is subjected to external impact, the internal structure of the buffer component can be used to block and buffer the impact force, thereby providing impact protection for the cable, improving the impact resistance of the cable, minimizing the damage to the cable caused by external impact, and thereby improving the protection performance of the cable. At the same time, when the cable is bent, the internal components of the buffer component can be used to buffer the force generated by the bending, and then cooperate with the supporting cable core member to provide bending protection for the cable, further improving the bending resistance of the cable.
[0007] Furthermore, the outer layer is made of a composite material with polyurethane as a matrix and silicon carbide particles uniformly dispersed inside.
[0008] By adopting the above technical solution, silicon carbide particles with a particle size of 50-100μm are evenly dispersed inside the outer layer to form a composite material layer, and the internal silicon carbide particles make its surface Rockwell hardness reach HRR120. During wear, hard bumps are formed to disperse the shear force, reducing the degree of wear of the cable under the same force and improving the wear resistance of the cable.
[0009] Furthermore, the conductor is made of 7 groups of 19 strands of 0.25mm diameter silver-plated copper core wires twisted in layers at a lay length of 8-10 times the wire diameter.
[0010] By adopting the above technical solution, the conductor uses silver-plated copper core wire as the core material. The silver plating layer can significantly reduce high-frequency signal loss, and the contact resistance is more stable during long-term use. At the same time, twisting multiple groups of silver-plated copper core wires can improve the overall tensile strength and flexibility of the conductor, suppress eddy current loss and external radiation, and enhance the performance of anti-electromagnetic interference.
[0011] Furthermore, the wall material of the repair microcapsule is made of urea-formaldehyde resin, and the core material of the repair microcapsule is made of terminal hydroxyl polybutadiene.
[0012] By adopting the above technical solution, the urea-formaldehyde resin wall material is a rigid polymer shell, while the terminal hydroxyl polybutadiene core material is a low-viscosity liquid rubber with excellent fluidity. The hydroxyl group reacts with the catalyst in the elastomer matrix to undergo room temperature curing reaction to form a chemical bond repair, thereby extending the service life of the cable and reducing maintenance costs. In addition, no external energy or human intervention is required in the microcapsule repair process.
[0013] Furthermore, the supporting cable core member includes a supporting skeleton arranged at the center of the middle layer, elastic microtubes are wound around the outer side of the supporting skeleton, and the interior of the elastic microtubes is filled with damping rubber filler.
[0014] By adopting the above technical solution, the supporting skeleton is a carbon fiber supporting skeleton with a spiral pitch of 12mm, which can prevent the cable core from being deformed or broken due to external force. At the same time, when the cable is bent, it can absorb most of the dynamic bending stress generated by the bending, thereby improving the bending resistance of the cable. The elastic microtube is an aluminum alloy microtube, and is spirally wound on the outside of the supporting skeleton. When the cable bends, the microtube elastically deforms to absorb energy, thereby buffering the force generated during bending. It is suitable for frequent movement or vibration environments, reduces the risk of failure due to material fatigue, and increases the service life of the cable.
[0015] Furthermore, the buffer assembly includes a plurality of buffer strips fixedly connected to the outer side of the middle layer, the outer side of the buffer strips is wrapped with a thin steel strip, and the space between the buffer strips and the thin steel strip is filled with filler.
[0016] By adopting the above technical solution, the buffer strip is made of thermoplastic polyurethane elastomer, and the impact force is buffered by the movement of molecular chain segments in the elastomer. The thin steel belt is wrapped around the outside of the buffer strip to form a flexible rigid layer, which can improve the impact resistance of the cable and form a double impact buffer with the buffer strip. The filler is made of silicone rubber sponge material, and the silicone rubber sponge material is used to fill the gaps between the buffer strip, the thin steel belt wrapping and the middle layer, thereby reducing the friction damage between the three during bending, and at the same time can buffer the force generated by bending, thereby increasing the service life of the cable.
[0017] Furthermore, the pre-buffer layer includes a protective layer fixedly connected to the outside of the outer layer, and a plurality of annular buffer ribs are provided on the protective layer.
[0018] By adopting the above technical solution, the spacing between the annular buffer ribs is 20 to 30 mm, and multiple annular buffer ribs form an equidistant annular rib group. The annular buffer ribs can first contact the impact object, and then provide preliminary buffering for the impact force, thereby reducing the transmission of the impact force.
[0019] A method for preparing a composite protective long-life cable for mining, comprising the following steps: S1: 19 strands of 0.25mm silver-plated copper wire are twisted into one group, and then 7 groups of silver-plated copper wire are twisted again with a lay length of 8-10 times the wire diameter to form a conductor; S2: After that, the inner layer is bonded to the conductor using an external twin-screw extruder. After bonding, multiple rebound strips are respectively set between the two conductors, and the supporting cable core is inserted in the middle of the multiple conductors. The conductor, supporting cable core and rebound strip are injected with fluororubber material using an external mold to form the middle layer. S3: After the middle layer is formed, the buffer assembly is installed on the outside of the middle layer using external hot melt equipment and winding equipment; S4: After the buffer component is formed and installed, the composite material is injected into its surface again using the external mold to form an outer layer on the outside of the buffer component; S5: After the outer layer is formed, the pre-buffer layer is wrapped around the outer surface of the outer layer, and the outer layer and the pre-buffer layer are bonded using an external hot-melt device to complete the preparation of the cable.
[0020] In summary, the present application includes at least one of the following beneficial effects: 1. In this application, the silicon carbide particles inside the outer layer make the surface Rockwell hardness reach HRR120, and hard bumps are formed during wear to disperse the shear force, thereby improving the wear resistance index of the cable and reducing the daily wear of the cable; the middle layer is made of fluororubber material, the CF bond energy in its molecular chain is 485kJ / mol, which can resist the penetration of pH-14 medium, further improving the acid and alkali resistance of the cable, thereby increasing the service life of the cable.
[0021] 2. In the present application, when using the cable, the internal components supporting the cable core are utilized to enhance the comprehensive toughness strength of the cable and improve the bending strength of the cable, so that the cable is not easily broken in frequent movement scenarios or frequent bending, providing anti-bending protection for the cable, further improving the comprehensive protection strength of the cable, and thus increasing the service life of the cable.
[0022] 3. In the present application, when the cable is in use, when the cable is subjected to external impact, the internal structure of the buffer assembly can be used to block and buffer the impact force, thereby providing impact protection for the cable, improving the impact resistance of the cable, minimizing the damage to the cable caused by external impact, and thereby improving the protection performance of the cable. At the same time, when the cable is bent, the internal components of the buffer assembly can be used to buffer the force generated by the bending, and then cooperate with the supporting cable core member to provide bending protection for the cable, further improving the bending resistance of the cable.
[0023] 4. In the present application, when the cable is subjected to external impact, the internal components of the pre-buffer layer can first contact the impact object, thereby preliminarily buffering the impact force, reducing the conduction of the impact force, and providing buffering protection for the cable. At the same time, the buffer component is used to provide impact protection for the cable, thereby further improving the impact resistance of the cable and increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a schematic diagram of the structure of this application; Figure 2 It is a schematic diagram of the structure of the inner layer in this application; Figure 3 It is a schematic diagram of the structure of the supporting cable core member in this application; Figure 4 is a schematic diagram of the internal structure of the elastic microtubule in this application; Figure 5 It is a schematic diagram of the partial structure of this application; Figure 6 It is a schematic diagram of the structure of the buffer component in this application; Figure 7 It is a structural diagram of the pre-buffer layer in this application.
[0025] Description of reference numerals: 1. Middle layer; 2. Conductor; 3. Inner layer; 4. Support cable core; 5. Buffer assembly; 6. Outer layer; 7. Pre-buffer layer; 8. Rebound strip; 31. Repair microcapsule; 41. Support skeleton; 42. Elastic microtube; 43. Damping rubber filler; 51. Buffer strip; 52. Thin steel strip wrapping; 53. Filler; 71. Protective layer; 72. Annular buffer rib. DETAILED DESCRIPTION
[0026] The following is combined with Figures 1 to 7 This application is described in further detail.
[0027] The embodiment of the present application discloses a composite protective long-life cable for mining.
[0028] Reference Figure 1 - Figure 2A composite protective high-life cable for mining, comprising a middle layer 1, a supporting cable core member 4 being fixedly connected to the middle of the middle layer 1, and a plurality of conductors 2 being installed inside the middle layer 1, the outer side of the conductor 2 being wrapped with an inner layer 3, the inner side of the inner layer 3 being filled with a plurality of groups of repair microcapsules 31, the plurality of conductors 2 being arranged in a square, and a rebound strip 8 being arranged between the conductors 2, a buffer component 5 being provided on the outer side of the middle layer 1, an outer layer 6 being fixedly connected to the outer side of the buffer component 5, a pre-buffer layer 7 being fixedly connected to the outer side of the outer layer 6, the outer layer 6 being made of a composite material with polyurethane as a matrix and silicon carbide particles uniformly dispersed inside, the conductor 2 being made of 7 groups of 19 strands of 0.25 mm diameter silver-plated copper core wires twisted in layers at a lay pitch of 8-10 times the wire diameter, the wall material of the repair microcapsule 31 being made of urea-formaldehyde resin, and the core material of the repair microcapsule 31 being made of terminal hydroxyl polybutadiene.
[0029] During the use of the cable, when the cable is bent, the internal structure of the supporting cable core member 4 can be used to buffer the force applied to the cable when bending, thereby reducing the damage to the cable when bending and protecting the cable from bending. During this period, the internal components of the buffer assembly 5 can buffer and intercept the force generated by the bending, thereby cooperating with the supporting cable core member 4 to protect the cable, improve the bending resistance of the cable, and minimize the damage caused by the bending of the cable. During use, when the cable is impacted, the internal components of the pre-buffer layer 7 can first contact the impact object, thereby preliminarily buffering the impact force and reducing the conduction of the impact force. The internal structure of the buffer assembly 5 can be used to block and buffer the impact force, thereby protecting the cable from impact, improving the impact resistance of the cable, minimizing the damage to the cable caused by external impact, and thereby improving the protective performance of the cable.
[0030] The outer layer 6 uses polyurethane material as the matrix, and silicon carbide particles with a particle size of 50-100μm are evenly dispersed inside to form a composite material layer. When in use, the silicon carbide particles inside the outer layer 6 make its surface Rockwell hardness reach HRR120. When worn, hard bumps are formed to disperse the shear force, reducing the degree of wear of the cable under the same force and improving the wear resistance of the cable.
[0031] The repair microcapsules 31 inside the inner layer 3 can rupture when the crack expands to 50μm, and the core material inside the repair microcapsules 31 flows out and undergoes a cross-linking reaction with the catalyst in the elastomer matrix of the inner layer 3, thereby repairing the broken inner layer 3, which can prevent the conductor from being exposed due to damage expansion. The urea-formaldehyde resin wall material is a rigid polymer shell, which only ruptures when the crack expands due to local stress exceeding the strength of the wall material. The end-hydroxyl polybutadiene core material is a low-viscosity liquid rubber with excellent fluidity. It can quickly penetrate and fill 0.1mm crack gaps within 5-10 seconds, and undergo a room temperature curing reaction with the catalyst in the elastomer matrix through the hydroxyl group to form a chemical bond repair, thereby automatically repairing the crack, thereby extending the service life of the cable and reducing maintenance costs. In addition, no external energy or manual intervention is required during the repair process of the repair microcapsules 31.
[0032] Conductor 2 uses silver-plated copper core wire as the core material. The silver plating layer can significantly reduce high-frequency signal loss. At the same time, silver has better oxidation resistance than copper, and the contact resistance is more stable after long-term use. 19 strands of 0.25mm diameter silver-plated copper core wire are layered and twisted at a lay pitch of 8-10 times the wire diameter. This can improve the overall tensile strength and flexibility of conductor 2, suppress eddy current loss and external radiation, enhance the anti-electromagnetic interference performance, and make the cable signal output more stable.
[0033] The rebound strip 8 is made of a silicone rubber spring. When the cable bends, the spring body compresses and stretches to balance the stress, thereby buffering the force generated by the bending and improving the bending strength of the cable. When the cable is subjected to external impact, the impact force is transmitted to the rebound strip 8, and the spring body absorbs kinetic energy through deformation, thereby buffering the impact force and improving the impact resistance of the cable.
[0034] Reference Figure 3 - Figure 4 The supporting cable core member 4 includes a supporting skeleton 41 arranged at the center of the middle layer 1 , an elastic microtube 42 is wound around the outer side of the supporting skeleton 41 , and the interior of the elastic microtube 42 is filled with a damping rubber filler 43 .
[0035] The support skeleton 41 is a carbon fiber support skeleton with a spiral pitch of 12mm. As the cable core of the cable, it can significantly enhance the cable's resistance to tensile strength, extrusion and bending, and prevent the cable core from deformation or breakage due to external forces. The carbon fiber skeleton has a bending modulus of 230GPa. When the cable bends, it can absorb most of the dynamic bending stress generated by the bending, thereby improving the bending resistance of the cable. In addition, the carbon fiber material has excellent fatigue resistance and can withstand tens of thousands of bending and stretching cycles without failure. It is suitable for frequent movement or vibration environments, reduces the risk of failure due to material fatigue, and increases the service life of the cable.
[0036] The elastic microtube 42 is an aluminum alloy microtube and is spirally wound around the outside of the support frame 41. When the cable bends, the microtube elastically deforms to absorb energy, thereby buffering the force generated during bending, and at the same time weakening the force transmitted to the support frame 41, reducing the possibility of damage to the cable when bending. The elastic microtube 42 is filled with a damping rubber filler 43. When the cable is impacted, the damping rubber can buffer the impact force, thereby cooperating with the buffer component 5 to buffer the impact force.
[0037] Reference Figure 5 - Figure 7 The buffer assembly 5 includes a plurality of buffer strips 51 fixedly connected to the outside of the middle layer 1, a thin steel strip wrap 52 is wound around the outside of the buffer strip 51, and a filler 53 is filled between the buffer strip 51 and the thin steel strip wrap 52. The pre-buffer layer 7 includes a protective layer 71 fixedly connected to the outside of the outer layer 6, and a plurality of annular buffer ribs 72 are arranged on the protective layer 71.
[0038] The buffer strip 51 is made of thermoplastic polyurethane elastomer. When the cable is impacted, the impact force is buffered by the movement of molecular chain segments in the elastomer, and the thin steel strip wrap 52 uses 0.1-0.15mm galvanized steel strip, and is wrapped around the outside of the buffer strip 51 with a spiral angle of 30°-45° to form a flexible rigid layer, which can improve the impact resistance of the cable and form a double impact buffer with the buffer strip 51. The filler 53 is made of silicone rubber sponge material, and the silicone rubber sponge material is used to fill the gaps between the buffer strip 51, the thin steel strip wrap 52 and the middle layer 1, thereby reducing the friction damage between the three during bending, and at the same time buffering the force generated by bending, thereby improving the service life of the cable. Here, when the thin steel strip wrap 52 forms a flexible rigid layer on the outside of the buffer strip 51, it will not interfere with the bending of the cable.
[0039] Here, the material of the protective layer 71 is the same as that of the outer layer 6, and a plurality of annular buffer ribs 72 are pressed inside the protective layer 71. The height of the annular buffer ribs 72 is between 1.5 and 2.0 mm, and the spacing between the annular buffer ribs 72 is 20 to 30 mm. The plurality of annular buffer ribs 72 form an equidistant annular rib group, which can first contact the impact object through the annular buffer ribs 72, and then preliminarily buffer the impact force, thereby reducing the conduction of the impact force. The annular buffer ribs 72 are made of polyethylene material, and the annular buffer ribs 72 are not easy to deform and break during impact.
[0040] A method for preparing a composite protective long-life cable for mining, comprising the following steps: S1: First, 19 strands of 0.25 mm silver-plated copper wire are twisted into one group, and then 7 groups of silver-plated copper wire are re-twisted with a lay length of 8-10 times the wire diameter to form conductor 2; S2: After that, the inner layer 3 is bonded to the conductor 2 using an external twin-screw extruder. After bonding, multiple rebound strips 8 are respectively arranged between two conductors 2, and the supporting cable core 4 is inserted in the middle of the multiple conductors 2. Fluorine rubber material is injected into the conductor 2, the supporting cable core 4 and the rebound strips 8 using an external mold to form the middle layer 1; S3: After the middle layer 1 is formed, the buffer assembly 5 is installed on the outer side of the middle layer 1 using external hot-melt equipment and winding equipment; S4: After the buffer component 5 is formed and installed, the composite material is injected onto its surface again using the external mold to form an outer layer 6 on the outside of the buffer component 5; S5: After the outer layer 6 is formed, the pre-buffer layer 7 is wrapped on the outer surface of the outer layer 6, and the outer layer 6 and the pre-buffer layer 7 are bonded by an external hot-melt device to complete the preparation of the cable.
[0041] Working principle: In the process of using the cable, when the cable is bent, the support skeleton 41 can be used as the cable core of the cable to significantly enhance the cable's tensile, extrusion and bending resistance. When the cable is bent, it can absorb most of the dynamic bending stress generated by the bending, thereby improving the cable's bending resistance. The elastic microtube 42 is an aluminum alloy microtube and is spirally wound on the outside of the support skeleton 41. When the cable is bent, the microtube elastically deforms to absorb energy, thereby buffering the force generated by the bending, thereby reducing the damage to the cable when bending, and protecting the cable from bending. At the same time, the force transmitted to the support skeleton 41 is weakened, reducing the possibility of damage to the cable when bending. The elastic microtube 42 is filled with damping rubber filler 43. When the cable is impacted, the damping rubber can buffer the impact force, and then cooperate with the buffer component 5 to buffer the impact force. During this period, the filler 53 can buffer and intercept the force generated by the bending, and then cooperate with the supporting cable core member 4 to protect the cable, thereby improving the cable's bending resistance. The damage caused by bending of the cable is minimized. During use, when the cable is impacted, the annular buffer rib 72 can first contact the impact object, thereby preliminarily buffering the impact force and reducing the transmission of the impact force. The buffer strip 51 can be used to block and buffer the impact force. When the cable is impacted, the impact force is buffered by the movement of molecular segments in the elastomer, and the thin steel strip wrap 52 adopts 0.1-0.15mm galvanized steel strip and is wrapped around the outside of the buffer strip 51 with a spiral angle of 30°-45° to form a flexible rigid layer, which can improve the impact resistance of the cable and form a double impact buffer with the buffer strip 51. The filler 53 adopts silicone rubber sponge material, and the gaps between the buffer strip 51, the thin steel strip wrap 52 and the middle layer 1 are filled with silicone rubber sponge material, thereby reducing the friction damage between the three during bending, and at the same time buffering the force generated by bending, thereby improving the service life of the cable, improving the impact resistance of the cable, minimizing the damage to the cable caused by external impact, and thus improving the protection performance of the cable, thereby improving the service life of the cable.
Claims
1. A composite protective long-life cable for mining, comprising a middle layer (1), characterized in that: A supporting cable core member (4) is fixedly connected to the middle of the middle layer (1), and a plurality of conductors (2) are installed inside the middle layer (1), the outer side of the conductors (2) is wrapped with an inner layer (3), and the interior of the inner layer (3) is filled with a plurality of groups of repair microcapsules (31), the plurality of conductors (2) are arranged in a square shape, and rebound strips (8) are provided between the conductors (2), a buffer component (5) is provided on the outer side of the middle layer (1), the outer side of the buffer component (5) is fixedly connected to the outer layer (6), and the outer side of the outer layer (6) is fixedly connected to the pre-buffer layer (7).
2. The composite protective long-life cable for mining according to claim 1, characterized in that: The outer layer (6) is made of a composite material with polyurethane as a matrix and silicon carbide particles uniformly dispersed inside.
3. The composite protective long-life cable for mining according to claim 1, characterized in that: The conductor (2) is made of 7 groups of 19 strands of 0.25 mm diameter silver-plated copper core wires twisted in layers at a lay length of 8-10 times the wire diameter.
4. The mine-use composite protective long-life cable according to claim 1, characterized in that: The wall material of the repair microcapsule (31) is made of urea-formaldehyde resin, and the core material of the repair microcapsule (31) is made of hydroxyl-terminated polybutadiene.
5. The mine-use composite protective long-life cable according to claim 1, characterized in that: The supporting cable core member (4) comprises a supporting skeleton (41) arranged at the center of the middle layer (1), an elastic microtube (42) is wound around the outer side of the supporting skeleton (41), and the interior of the elastic microtube (42) is filled with a damping rubber filler (43).
6. The mine-use composite protective long-life cable according to claim 1, characterized in that: The buffer assembly (5) comprises a plurality of buffer strips (51) fixedly connected to the outside of the middle layer (1), a thin steel strip wrap (52) being wound around the outside of the buffer strips (51), and a filler (53) being filled between the buffer strips (51) and the thin steel strip wrap (52).
7. The mine-use composite protective long-life cable according to claim 1, characterized in that: The pre-buffer layer (7) comprises a protective layer (71) fixedly connected to the outside of the outer layer (6), and a plurality of annular buffer ribs (72) are provided on the protective layer (71).
8. A method for preparing a composite protective long-life cable for use in mining, the method being applicable to a composite protective long-life cable for use in mining as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: First, 19 strands of 0.25 mm silver-plated copper wire are twisted into one group, and then 7 groups of silver-plated copper wire are twisted again with a twist length of 8-10 times the wire diameter to form a conductor (2); S2: Afterwards, the inner layer (3) is bonded to the conductor (2) using an external twin-screw extruder. After bonding, a plurality of rebound strips (8) are respectively arranged between the two conductors (2), and the supporting cable core (4) is inserted in the middle of the plurality of conductors (2). The conductor (2), the supporting cable core (4) and the rebound strip (8) are injected with fluororubber material using an external mold to form a middle layer (1); S3: After the middle layer (1) is formed, a buffer component (5) is installed on the outer side of the middle layer (1) using an external hot-melt device and a winding device; S4: After the buffer component (5) is formed and installed, the composite material is injected onto its surface again using the external mold to form an outer layer (6) on the outside of the buffer component (5); S5: After the outer layer (6) is formed, the pre-buffer layer (7) is wrapped around the outer surface of the outer layer (6), and the outer layer (6) and the pre-buffer layer (7) are bonded using an external hot-melt device, thereby completing the preparation of the cable.