Winding and trailing cable and preparation method thereof

Abstract

The invention discloses a winding and trailing cable and a preparation method thereof.The cable comprises a sheath layer, a semi-conductive inner sheath and a cable core which are sequentially arranged from outside to inside, and the cable core comprises a power conductor set, a grounding conductor set, a cooling liquid conveying pipe, a hexagonal star-shaped support and a monitoring conductor set; and the power conductor group and the grounding conductor group are distributed at the periphery of the cooling liquid conveying pipe and are supported and separated by the hexagonal star-shaped bracket. Through redesign of the cable structure, the cable has excellent electrical and mechanical functions, and meanwhile, the cooling liquid conveying pipe is integrated in the center of the cable, so that the dual functions of electric energy transmission and drilling cooling liquid conveying are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of cables, and in particular relates to a winding and trailing cable and a preparation method thereof. Background Art

[0002] Underground mining has always been an important mining mode, which extends underground by digging tunnels. Due to the small space and poor ventilation of the tunnels, in order to avoid diesel-powered underground mining equipment from polluting the tunnel air, more and more underground mining equipment is electrified. Therefore, in order to power the equipment, winding and dragging cables are connected to the tail of the equipment. The cables are released when the equipment moves forward and wound and collected on the reel of the equipment when the equipment moves backward. Due to the harsh working environment of underground mining operations, cables need to withstand damage such as dragging, winding, torsion, and friction. Usually, the life of the cable is only about 3 months.

[0003] The technical solutions of existing cable products usually use EPDM as insulation and chlorinated polyethylene as sheath. The sheath material has a relatively low tensile strength (11Mpa) and poor tear strength (5N / mm). This makes it very easy for the cable sheath to be damaged by falling rocks, rolling, winding, dragging, etc., thus causing line failures. In addition, existing cables can only realize the single function of power transmission, and need to lay a separate coolant delivery pipeline, and do not have integration functions. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the object of the present invention is to provide a winding and trailing cable and a preparation method thereof.

[0005] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0006] A winding and trailing cable comprises a sheath layer, a semi-conductive inner sheath and a cable core which are arranged in sequence from the outside to the inside. The cable core comprises a power conductor group, a grounding conductor group, a coolant delivery pipe, a hexagonal star bracket and a monitoring conductor group. The power conductor group and the grounding conductor group are distributed on the periphery of the coolant delivery pipe and are supported and separated by the hexagonal star bracket.

[0007] Furthermore, the hexagonal star-shaped bracket is arranged at the center of the cable core, and a coolant delivery pipe is arranged at the center of the hexagonal star-shaped bracket.

[0008] Furthermore, the power conductor group includes a plurality of power conductor units, and each power conductor unit includes a power conductor, insulation and insulation shielding arranged in sequence from the inside to the outside.

[0009] Furthermore, the grounding conductor group includes a plurality of grounding conductor units, the outer dimensions of the grounding conductor units and the power conductor units are consistent, and each grounding conductor unit includes a grounding conductor and a semi-conductive covering layer arranged in sequence from the inside to the outside.

[0010] Furthermore, the coolant delivery pipe includes a first high-strength chloroprene rubber layer, a fiber woven mesh reinforcement layer and a second high-strength chloroprene rubber layer which are sequentially bonded from the inside to the outside.

[0011] Furthermore, the monitoring conductor group includes a plurality of monitoring conductor units, and monitoring conductor units are arranged between adjacent power conductor groups, between adjacent grounding conductor groups, and between adjacent power conductor groups and grounding conductor groups. Each monitoring conductor unit includes a plurality of monitoring cores twisted together with a central aramid rope, and each monitoring core includes a monitoring conductor and a monitoring conductor insulation extruded on the outside thereof.

[0012] Furthermore, the semiconductive inner sheath is electrically connected to the semiconductive covering layer of the ground conductor unit and the insulating shield of the power conductor unit.

[0013] Furthermore, the sheath layer includes a first high-strength chloroprene rubber, a fiber braided torsion-resistant layer and a second high-strength chloroprene rubber which are sequentially arranged from the outside to the inside.

[0014] The present invention also discloses a method for preparing a winding and towing cable, comprising the following steps:

[0015] First, prepare the power conductor, ground conductor and monitoring conductor;

[0016] Secondly, a power conductor unit, a grounding conductor unit and a monitoring conductor unit are prepared: insulation is extruded outside the power conductor, and an insulation shield is extruded outside the insulation, and the insulation shield adopts semi-conductive chloroprene rubber, so as to obtain a power conductor unit; a semi-conductive covering layer is extruded outside the grounding conductor, and the semi-conductive covering layer adopts semi-conductive chloroprene rubber, so as to obtain a grounding conductor unit; monitoring conductor insulation is extruded outside the monitoring conductor, so as to obtain a monitoring core, and a plurality of monitoring cores are twisted around the central aramid rope to form a monitoring conductor unit;

[0017] Subsequently, a coolant delivery pipe is prepared, and a hexagonal star bracket is extruded through a hexagonal star die, and the hexagonal star bracket covers the coolant delivery pipe at the center;

[0018] Subsequently, the hexagonal star bracket, the power conductor unit, the grounding conductor unit and the monitoring conductor unit are cabled to obtain a cable core;

[0019] Subsequently, on the outside of the above-mentioned completed cable core, a semi-conductive chloroprene rubber is used to produce a semi-conductive inner sheath by extrusion process of a rubber continuous vulcanization production line. The vulcanization process adopts semi-vulcanization, and the steam pressure does not exceed 5kg, so that the semi-conductive inner sheath is in a state of under-vulcanization, so as to ensure secondary vulcanization when the sheath layer is extruded, so as to achieve the result that the two-layer structure is adhered to each other;

[0020] Subsequently, the first high-strength chloroprene rubber is produced on the outside of the semi-conductive inner sheath by using a rubber continuous vulcanization production line extrusion process, and the vulcanization process adopts full vulcanization with a steam pressure of 7kg, so that the semi-conductive inner sheath and the first high-strength chloroprene rubber are bonded to form a whole;

[0021] Subsequently, aramid yarn is used to make a woven torsion-resistant layer, and on the outside of the woven torsion-resistant layer, a second high-strength chloroprene rubber is produced by extrusion using a rubber continuous vulcanization production line. The vulcanization process uses full vulcanization with a steam pressure of 7kg, so that the first high-strength chloroprene rubber and the second high-strength chloroprene rubber can be vulcanized together again, and finally a sheath layer with reliable mutual adhesion is obtained.

[0022] Furthermore, the formula ingredients of the semi-conductive chloroprene rubber are shown in Table 1 below:

[0023] Table 1

[0024] Components Weight Percent Neoprene Rubber 100％ Sulfurant magnesium oxide 3-8％ Vulcanizing agent zinc oxide 3-8％ Accelerator TMTD 0.1-1％ Accelerator NA-22 0.1-1％ High Conductive Acetylene Carbon Black 40-60％ Antioxidant 0.5-3％ Stearic acid 0.1-2％ Calcium carbonate 0.2-0.6％ .

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention discloses a winding and dragging cable and a preparation method thereof. The cable comprises a sheath layer, a semi-conductive inner sheath and a cable core which are sequentially arranged from the outside to the inside. The cable core comprises a power conductor group, a grounding conductor group, a coolant delivery pipe, a hexagonal star bracket and a monitoring conductor group. The power conductor group and the grounding conductor group are distributed on the periphery of the coolant delivery pipe and are supported and separated by the hexagonal star bracket. The cable structure is redesigned to provide the cable with excellent electrical and mechanical functions. At the same time, the coolant delivery pipe is integrated in the center of the cable to achieve the dual functions of power transmission and drilling coolant delivery. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a schematic structural diagram of the coolant delivery pipe of the present invention;

[0029] Figure 3 It is a schematic structural diagram of the hexagonal star-shaped bracket of the present invention;

[0030] Figure 4It is a structural schematic diagram of the monitoring line core of the present invention;

[0031] Figure 5 It is a schematic structural diagram of the sheath layer of the present invention. DETAILED DESCRIPTION

[0032] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0033] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0034] like Figure 1-5 As shown, the present invention discloses a winding and trailing cable, comprising a sheath layer 10, a semi-conductive inner sheath 9 and a cable core which are sequentially arranged from the outside to the inside, wherein the cable core comprises a power conductor group, a grounding conductor group, a coolant delivery pipe 6, a hexagonal star bracket 7 and a monitoring conductor group, the hexagonal star bracket 7 is arranged at the center of the cable core, a coolant delivery pipe 6 is arranged at the center of the hexagonal star bracket 7, the power conductor group, the grounding conductor group and the monitoring conductor group are distributed on the periphery of the coolant delivery pipe 6, and the power conductor unit and the grounding conductor unit are supported and separated by the hexagonal star bracket 7 to avoid mutual friction between them, thereby improving the service life of the cable.

[0035] The power conductor group includes several power conductor units, each of which includes a power conductor 1, insulation 2 and insulation shield 3 arranged in sequence from the inside to the outside. The insulation 2 is used to provide electrical insulation performance, and the insulation shield 3 is extruded outside the insulation 2 to shield and transmit fault current.

[0036] The grounding conductor group includes a plurality of grounding conductor units, which have the same dimensions as the power conductor units and play the role of transmitting fault current. Each grounding conductor unit includes a grounding conductor 4 and a semi-conductive covering layer 5 arranged in sequence from the inside to the outside. The semi-conductive covering layer 5 is coated on the outside of the grounding conductor 4 and has the functions of mechanical protection and conducting fault current.

[0037] The coolant delivery pipe 6 includes a first high-strength chloroprene rubber layer 6-1, a fiber woven mesh reinforcement layer 6-2, and a second high-strength chloroprene rubber layer 6-3 bonded in sequence from the inside to the outside. The first high-strength chloroprene rubber layer 6-1 and the second high-strength chloroprene rubber layer 6-3 are made of high-strength chloroprene rubber material with a tear strength of more than 10N / mm, a tensile strength of more than 15Mpa, and an elongation at break of more than 500%. The coolant delivery pipe 6 has high strength, corrosion resistance, and aging resistance.

[0038] The coolant delivery pipe 6 can deliver coolant to the drill bit, avoiding the need to lay separate pipelines and achieving functional integration.

[0039] The monitoring conductor group includes a plurality of monitoring conductor units, which are arranged between adjacent power conductor groups, between adjacent grounding conductor groups, and between adjacent power conductor groups and grounding conductor groups. Each monitoring conductor unit includes a plurality of monitoring cores twisted together around a central aramid rope 8-1, and each monitoring core includes a monitoring conductor 8-2 and a monitoring conductor insulation 8-3 extruded on the outside thereof.

[0040] The semi-conductive inner sheath 9 is preferably made of semi-conductive chloroprene rubber, covering the cable core. Since it is made of semi-conductive material, it forms an electrical connection with the semi-conductive covering layer 5 and the insulating shield 3, which can effectively improve the fault current transmission capacity.

[0041] The sheath layer 10 includes a first high-strength chloroprene rubber 10-1, with a tear strength of more than 10N / mm, a tensile strength of more than 15Mpa, and an elongation at break of more than 500%; it also includes a fiber braided torsion-resistant layer 10-2, which is woven with aramid fibers in gaps, and the braiding density does not exceed 30%; it also includes a second high-strength chloroprene rubber 10-3, with a tear strength of more than 10N / mm, a tensile strength of more than 15Mpa, and an elongation at break of more than 500%. The first high-strength chloroprene rubber 10-1, the fiber braided torsion-resistant layer 10-2, and the second high-strength chloroprene rubber 10-3 are bonded together from outside to inside, and the first high-strength chloroprene rubber 10-1 and the second high-strength chloroprene rubber 10-3 can be bonded together through the gap of the fiber braided torsion-resistant layer 10-2, and the fiber braided torsion-resistant layer 10-2 plays a supporting role in the middle, which can significantly improve the strength of the sheath.

[0042] The present invention redesigns the cable structure to provide the cable with excellent electrical and mechanical functions, and integrates the drilling coolant delivery pipe 6 in the center of the cable to achieve the dual functions of power transmission and drilling coolant delivery.

[0043] The present invention also discloses a method for preparing a winding and towing cable, comprising the following steps:

[0044] First, prepare the power conductor 1, ground conductor 4 and monitoring conductor 8-2:

[0045] The power conductor 1 is made of a number of tinned copper wires twisted together, with a bundled wire + re-twisted structure design, and the arrangement is (1+6+12) / 20, with a bundled wire pitch of 14 to 16 times the pitch diameter ratio, and the bundled wire is twisted to the right; the re-twisted structure is 1+6+12, with a re-twisted pitch of 8 to 10 times the pitch diameter ratio, and the re-twisted is twisted to the left;

[0046] The ground conductor 4 is formed by twisting a plurality of tinned copper wires, the wire bundle pitch is 14 to 16 times the pitch diameter ratio, the wire bundle is twisted in the right direction, the re-twisted pitch is 4 to 6 times the pitch diameter ratio, and the re-twisted direction is left direction;

[0047] The monitoring conductor 8-2 is made of a number of tinned copper wires twisted together, with the wires twisted in the right direction and the wire pitch being 14 to 16 times the pitch diameter ratio; the re-twisted wires are twisted in the left direction and the re-twisted pitch is 8 to 10 times;

[0048] Next, prepare the power conductor unit, ground conductor unit and monitoring conductor unit:

[0049] An insulation 2 is extruded outside the power conductor 1, and an insulation shield 3 is extruded outside the insulation 2, wherein the insulation shield 3 is made of semi-conductive chloroprene rubber, thereby obtaining a power conductor unit;

[0050] A semi-conductive covering layer 5 is extruded outside the grounding conductor 4, and the semi-conductive covering layer 5 is made of semi-conductive chloroprene rubber, so as to obtain a grounding conductor unit;

[0051] A monitoring conductor insulation 8-3 is extruded outside the monitoring conductor 8-2 to obtain a monitoring core, and a plurality of monitoring cores are twisted around a central aramid rope 8-1 to form a monitoring conductor unit;

[0052] Subsequently, a coolant delivery pipe 6 is prepared, and a hexagonal star-shaped bracket 7 is extruded through a hexagonal star-shaped die, and the hexagonal star-shaped bracket 7 covers the coolant delivery pipe 6 at the center;

[0053] Subsequently, the hexagonal star bracket 6, the power conductor unit, the grounding conductor unit and the monitoring conductor unit are cabled to obtain a cable core;

[0054] Subsequently, a semi-conductive chloroprene rubber is used on the outside of the cable core to produce a semi-conductive inner sheath 9 by extruding a rubber continuous vulcanization production line. The vulcanization process adopts semi-vulcanization, and the steam pressure does not exceed 5 kg, so that the semi-conductive inner sheath 9 is in a state of lack of vulcanization, so as to ensure secondary vulcanization when the sheath layer 10 is extruded, so as to achieve the result that the two-layer structure is adhered to each other;

[0055] Subsequently, the second high-strength chloroprene rubber 10-3 is produced on the outside of the semi-conductive inner sheath 9 by using a rubber continuous vulcanization production line extrusion process, and the vulcanization process adopts full vulcanization with a steam pressure of 7kg, so that the semi-conductive inner sheath 9 and the second high-strength chloroprene rubber 10-3 are bonded to form a whole;

[0056] Subsequently, aramid yarn is used to make a woven torsion-resistant layer 10-2, and outside the woven torsion-resistant layer 10-2, a first high-strength chloroprene rubber 10-1 is produced by extrusion using a rubber continuous vulcanization production line. The vulcanization process uses full vulcanization with a steam pressure of 7kg, so that the first high-strength chloroprene rubber 10-1 and the second high-strength chloroprene rubber 10-3 can be vulcanized together again, and finally a sheath layer 10 with reliable mutual adhesion is obtained.

[0057] Among them, the formula ingredients of semi-conductive chloroprene rubber are shown in Table 1 below:

[0058] Table 1

[0059] Components Weight Percent Neoprene Rubber 100％ Sulfurant magnesium oxide 3-8％ Vulcanizing agent zinc oxide 3-8％ Accelerator TMTD 0.1-1％ Accelerator NA-22 0.1-1％ High Conductive Acetylene Carbon Black 40-60％ Antioxidant 0.5-3％ Stearic acid 0.1-2％ Calcium carbonate 0.2-0.6％ .

[0060] The preparation steps of semi-conductive chloroprene rubber are as follows:

[0061] 1) Take all the raw chloroprene rubber and mix them quickly in an internal mixer. Add antioxidant HVA-2 and high conductive acetylene black during mixing. Mixing temperature is 40-50℃ and mixing time is 6-10min.

[0062] 2) After the mixing is completed, the obtained rubber is cooled and then mixed for the second time. The curing agent magnesium oxide, the curing agent zinc oxide, the accelerator TMTD, the accelerator NA-22, and the calcium carbonate are added in an open mill. The mixing temperature is 40-50°C and the mixing time is 10-15min.

[0063] 3) After the mixing is completed, the film is cooled, cut, and stearic acid is sprinkled on it to obtain the semi-conductive chloroprene rubber.

[0064] Example 1

[0065] like Figure 1-5 As shown, a winding and trailing cable comprises a sheath layer 10, a semi-conductive inner sheath 9 and a cable core which are arranged in sequence from the outside to the inside, wherein the cable core comprises a power conductor group, a grounding conductor group, a coolant delivery pipe 6, a hexagonal star bracket 7 and a monitoring conductor group, the hexagonal star bracket 7 is arranged at the center of the cable core, a coolant delivery pipe 6 is arranged at the center of the hexagonal star bracket 7, and the power conductor group, the grounding conductor group and the monitoring conductor group are distributed on the periphery of the coolant delivery pipe 6.

[0066] The power conductor group includes three adjacent power conductor units, each of which includes a power conductor 1, insulation 2 and insulation shield 3 arranged in sequence from the inside to the outside. The three power conductors 1 correspond to the three-phase wire cores A, B and C respectively. The insulation 2 adopts EPDM rubber material for cables to provide electrical insulation performance. The insulation shield 3 adopts semi-conductive chloroprene rubber and is extruded outside the insulation 2 to shield and transmit fault current.

[0067] The grounding conductor group includes three adjacent grounding conductor units. The grounding conductor units and the power conductor units have the same dimensions and play the role of transmitting fault current. Each grounding conductor unit includes a grounding conductor 4 and a semi-conductive covering layer 5 arranged from the inside to the outside. The semi-conductive covering layer 5 is made of semi-conductive chloroprene rubber and is coated on the outside of the grounding conductor 4. It has the functions of mechanical protection and conducting fault current.

[0068] The three power conductor units and the three grounding conductor units are supported and separated by the hexagonal star bracket 7 to avoid mutual friction between them, thereby increasing the service life of the cable.

[0069] The coolant delivery pipe 6 includes a first high-strength chloroprene rubber layer 6-1, a fiber woven mesh reinforcement layer 6-2, and a second high-strength chloroprene rubber layer 6-3 bonded in sequence from the inside to the outside. The first high-strength chloroprene rubber layer 6-1 and the second high-strength chloroprene rubber layer 6-3 are made of high-strength chloroprene rubber material with a tear strength of more than 10N / mm, a tensile strength of more than 15Mpa, and an elongation at break of more than 500%. The coolant delivery pipe 6 has high strength, corrosion resistance, and aging resistance.

[0070] The coolant delivery pipe 6 can deliver coolant to the drill bit, avoiding the need to lay separate pipelines and achieving functional integration.

[0071] The monitoring conductor group includes six monitoring conductor units, which are arranged between adjacent power conductor groups, between adjacent grounding conductor groups, and between adjacent power conductor groups and grounding conductor groups. Each monitoring conductor unit includes three monitoring cores twisted together around a central aramid rope 8-1, and each monitoring core includes a monitoring conductor 8-2 and a monitoring conductor insulation 8-3 extruded on the outside thereof.

[0072] The semi-conductive inner sheath 9 is made of semi-conductive chloroprene rubber and covers the cable core. Since it is made of semi-conductive material, it forms an electrical connection with the semi-conductive covering layer 5 and the insulating shield 3, which can effectively improve the fault current transmission capacity.

[0073] The sheath layer 10 includes a first high-strength chloroprene rubber 10-1, with a tear strength of more than 10N / mm, a tensile strength of more than 15Mpa, and an elongation at break of more than 500%; it also includes a fiber braided torsion-resistant layer 10-2, which is woven with aramid fibers at intervals and has a braiding density of 30%; it also includes a second high-strength chloroprene rubber 10-3, with a tear strength of more than 10N / mm, a tensile strength of more than 15Mpa, and an elongation at break of more than 500%. The first high-strength chloroprene rubber 10-1, the fiber braided torsion-resistant layer 10-2, and the second high-strength chloroprene rubber 10-3 are bonded together from the outside to the inside, and the first high-strength chloroprene rubber 10-1 and the second high-strength chloroprene rubber 10-3 can be bonded together through the gap of the fiber braided torsion-resistant layer 10-2, and the fiber braided torsion-resistant layer 10-2 plays a supporting role in the middle, which can significantly improve the strength of the sheath.

[0074] In Example 1, the cable structure is redesigned to provide the cable with excellent electrical and mechanical functions. At the same time, the drilling coolant delivery pipe 6 is integrated into the center of the cable to achieve the dual functions of power transmission and drilling coolant delivery.

[0075] A method for preparing a winding and towing cable comprises the following steps:

[0076] 1) Preparation of power conductor 1

[0077] 50mm 2 Taking the power conductor as an example, 380 tinned copper wires with a diameter of 0.401 mm are used, and the structure design of bundled wire + re-twisted wire is adopted. The arrangement method is (1+6+12) / 20, that is, 20 tinned copper wires with a diameter of 0.401 mm are bundled into one strand, the bundle pitch is 14 times the pitch-diameter ratio, and the bundle is twisted to the right; 19 strands of bundled wire are re-twisted using the structure of 1+6+12, the re-twisted pitch is 8 times the pitch-diameter ratio, and the re-twisted is twisted to the left;

[0078] 2) Prepare ground conductor 4

[0079] The ground conductor 4 is made of 120 tinned copper wires with a diameter of 0.300 mm, the bundled wires are 10 tinned copper wires with a diameter of 0.300 mm, the bundled wire pitch is 14 times the pitch diameter ratio, the bundled wires are twisted in the right direction, the re-twisted wire pitch is 4 times the pitch diameter ratio, and the re-twisted wires are twisted in the left direction;

[0080] 3) Preparation of monitoring conductor 8-2

[0081] The monitoring conductor 8-2 is made of 40 0.200mm diameter tinned copper wires twisted together, arranged in the manner of 1 / aramid rope + 4 / 10, i.e. 10 tinned copper wires are bundled, the bundles are twisted in the right direction, the bundle pitch is 14 times the pitch diameter ratio; the re-twisted is twisted in the left direction, the re-twisted pitch is 8 times;

[0082] 4) Prepare the power conductor unit, grounding conductor unit and monitoring conductor unit:

[0083] An insulation 2 is extruded outside the power conductor 1. The insulation 2 is made of ethylene propylene rubber, and the insulation performance meets the requirements of R-EP-90 ethylene propylene insulation in AS / NZS 3808; an insulation shield 3 is extruded outside the insulation 2. The insulation shield 3 is made of semi-conductive chloroprene rubber and is produced by a double-layer co-extrusion process of an SJ90+65 rubber continuous vulcanization production line. The insulation 2 is in the inner layer and the insulation shield 3 is in the outer layer. The nominal thickness of the insulation 2 is 2.0 mm and the minimum thickness is 1.70 mm. The nominal thickness of the insulation shield 3 is 1.0 mm and the minimum thickness is 0.60 mm, thereby obtaining a power conductor unit. Three power conductor units are obtained by the same method.

[0084] A semi-conductive covering layer 5 is extruded outside the grounding conductor 4. The semi-conductive covering layer 5 is made of semi-conductive chloroprene rubber and is produced by extrusion process of a rubber continuous vulcanization production line. The nominal thickness of the semi-conductive covering layer 5 is 0.8 mm and the minimum thickness is 0.60 mm, thereby obtaining a grounding conductor unit. Three grounding conductor units are obtained by the same method.

[0085] A monitoring conductor insulation 8-3 is extruded outside the monitoring conductor 8-2. The monitoring conductor insulation 8-3 is made of ethylene propylene rubber insulation material, and its insulation performance meets the requirements of R-EP-90 ethylene propylene insulation in AS / NZS 3808, thereby obtaining a monitoring core. Every three monitoring cores are twisted by a 630-type cage twisting device, right-handed, with a cable pitch of 8 times the pitch diameter ratio. The cable is a strand of aramid rope 8-1 twisted around the center of three monitoring cores. The aramid rope 8-1 is made of 3 / 1500D aramid yarns, thereby forming a monitoring conductor unit. Six monitoring conductor units are obtained by the same method.

[0086] 5) Preparation of coolant delivery pipe 6:

[0087] The coolant delivery pipe 6 adopts a composite reinforced liquid pipe design, and adopts a vulcanization composite process to bond the first high-strength chloroprene rubber layer 6-1, the fiber braided mesh reinforcement layer 6-2, and the second high-strength chloroprene rubber layer 6-3, so that the coolant delivery pipe 6 has high strength, corrosion resistance, and aging resistance.

[0088] 6) Extruding a hexagonal star-shaped bracket 7 through a hexagonal star-shaped die, and making the hexagonal star-shaped bracket 7 cover the coolant delivery pipe 6 at the center;

[0089] 7) The hexagonal star bracket 7, three power conductor units, three grounding conductor units, and six monitoring conductor units are cabled using a 2000 type 3+3 winding device, the cable strands are twisted in the right direction, and the cable pitch is controlled at 6 times the pitch ratio to obtain a cable core;

[0090] 8) On the outside of the cable core completed above, a semi-conductive chloroprene rubber material is used, and a rubber continuous vulcanization production line is used to extrude the semi-conductive inner sheath 9. The vulcanization process adopts semi-vulcanization, and the steam pressure is 5kg, so that the semi-conductive inner sheath 9 is in a state of lack of vulcanization to ensure secondary vulcanization when the sheath layer 10 is extruded, so as to achieve the result that the two-layer structure is adhered to each other;

[0091] 9) On the outside of the semi-conductive inner sheath 9, a high-strength chloroprene rubber material is used, and a second high-strength chloroprene rubber 10-3 is produced by extrusion using a rubber continuous vulcanization production line. The vulcanization process uses full vulcanization with a steam pressure of 7kg, so that the semi-conductive inner sheath 9 and the second high-strength chloroprene rubber 10-3 of this layer are adhered to form a whole;

[0092] 10) Using 3 twisted 1100dtex aramid yarns for weaving, 6 spindles for left direction and 6 spindles for right direction, the weaving pitch is controlled at 2.5 times the pitch ratio to obtain a 3D braided torsion-resistant layer 10-2;

[0093] 11) On the outside of the woven torsion-resistant layer 10-2, a high-strength chloroprene rubber material is used, and a first high-strength chloroprene rubber 10-1 is produced by extrusion using a rubber continuous vulcanization production line. The vulcanization process uses full vulcanization with a steam pressure of 7kg, so that the first high-strength chloroprene rubber 10-1 and the second high-strength chloroprene rubber 10-3 can be vulcanized together again, and finally a sheath layer 10 with a "sandwich" structure that is reliably adhered to each other is obtained.

[0094] The difference between Examples 1-3 is that the formula components of the semi-conductive chloroprene rubber are different. The formula components of the semi-conductive chloroprene rubber of Examples 1-3 are shown in Table 1 below.

[0095] Table 1

[0096]

[0097] The preparation steps of semi-conductive chloroprene rubber are as follows:

[0098] 1) Take all the raw chloroprene rubber and mix them quickly in an internal mixer. Add antioxidant HVA-2 and high conductive acetylene black during mixing. Mixing temperature is 40°C and mixing time is 10 minutes.

[0099] 2) After the mixing is completed, the obtained rubber is cooled and then mixed for the second time. The open mill is used to add the vulcanizing agent magnesium oxide, the vulcanizing agent zinc oxide, the accelerator TMTD, the accelerator NA-22, and the calcium carbonate. The mixing temperature is 40°C and the mixing time is 10 minutes.

[0100] 3) After the mixing is completed, the film is cooled, cut, and stearic acid is sprinkled on it to obtain the semi-conductive chloroprene rubber.

[0101] The performance of the cable produced in Example 2 was tested, and the results are shown in Table 2 below.

[0102] Table 2

[0103]

[0104]

[0105] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0106] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A winding and trailing cable, characterized in that: It includes a sheath layer, a semi-conductive inner sheath and a cable core which are arranged in sequence from the outside to the inside. The cable core includes a power conductor group, a grounding conductor group, a coolant delivery pipe, a hexagonal star bracket and a monitoring conductor group. The power conductor group and the grounding conductor group are distributed on the periphery of the coolant delivery pipe and are supported and separated by the hexagonal star bracket.

2. A winding and trailing cable according to claim 1, characterized in that: The hexagonal star-shaped bracket is arranged at the center of the cable core, and a coolant delivery pipe is arranged at the center of the hexagonal star-shaped bracket.

3. A winding and trailing cable according to claim 1, characterized in that: The power conductor group includes a plurality of power conductor units, and each power conductor unit includes a power conductor, insulation and insulation shielding arranged in sequence from the inside to the outside.

4. A winding and trailing cable according to claim 1, characterized in that: The grounding conductor group includes a plurality of grounding conductor units. The grounding conductor units have the same outer dimensions as the power conductor units. Each grounding conductor unit includes a grounding conductor and a semi-conductive covering layer which are sequentially arranged from the inside to the outside.

5. A winding and trailing cable according to claim 1, characterized in that: The coolant delivery pipe comprises a first high-strength chloroprene rubber layer, a fiber braided mesh reinforcement layer and a second high-strength chloroprene rubber layer which are sequentially bonded from the inside to the outside.

6. A winding and trailing cable according to claim 1, characterized in that: The monitoring conductor group includes a plurality of monitoring conductor units, which are arranged between adjacent power conductor groups, between adjacent grounding conductor groups, and between adjacent power conductor groups and grounding conductor groups. Each monitoring conductor unit includes a plurality of monitoring cores twisted together with aramid ropes around a center, and each monitoring core includes a monitoring conductor and a monitoring conductor insulation extruded on the outside thereof.

7. A winding and trailing cable according to claim 1, characterized in that: The semiconductive inner sheath forms an electrical connection with the semiconductive covering layer of the ground conductor unit and the insulating shield of the power conductor unit.

8. A winding and trailing cable according to claim 1, characterized in that: The sheath layer comprises a first high-strength chloroprene rubber, a fiber braided torsion-resistant layer and a second high-strength chloroprene rubber which are arranged in sequence from the outside to the inside.

9. A method for preparing a winding and trailing cable, characterized in that: The following steps are involved: First, prepare the power conductor, ground conductor and monitoring conductor; Next, prepare the power conductor unit, ground conductor unit and monitoring conductor unit: Insulation is extruded outside the power conductor, and insulation shield is extruded outside the insulation, and the insulation shield adopts semi-conductive chloroprene rubber, so as to obtain a power conductor unit; a semi-conductive covering layer is extruded outside the grounding conductor, and the semi-conductive covering layer adopts semi-conductive chloroprene rubber, so as to obtain a grounding conductor unit; monitoring conductor insulation is extruded outside the monitoring conductor, so as to obtain a monitoring core, and a plurality of monitoring cores are twisted around the central aramid rope to form a monitoring conductor unit; Subsequently, a coolant delivery pipe is prepared, and a hexagonal star bracket is extruded through a hexagonal star die, and the hexagonal star bracket covers the coolant delivery pipe at the center; Subsequently, the hexagonal star bracket, the power conductor unit, the grounding conductor unit and the monitoring conductor unit are cabled to obtain a cable core; Subsequently, on the outside of the above-mentioned completed cable core, a semi-conductive chloroprene rubber is used to produce a semi-conductive inner sheath by extrusion process of a rubber continuous vulcanization production line. The vulcanization process adopts semi-vulcanization, and the steam pressure does not exceed 5kg, so that the semi-conductive inner sheath is in a state of under-vulcanization, so as to ensure secondary vulcanization when the sheath layer is extruded, so as to achieve the result that the two-layer structure is adhered to each other; Subsequently, the first high-strength chloroprene rubber is produced on the outside of the semi-conductive inner sheath by adopting a rubber continuous vulcanization production line extrusion process, and the vulcanization process adopts full vulcanization to allow the semi-conductive inner sheath to adhere to the first high-strength chloroprene rubber to form a whole; Subsequently, aramid yarn is used to make a woven torsion-resistant layer, and on the outside of the woven torsion-resistant layer, a second high-strength chloroprene rubber is produced by extrusion using a rubber continuous vulcanization production line. The vulcanization process uses full vulcanization with a steam pressure of 7kg, so that the first high-strength chloroprene rubber and the second high-strength chloroprene rubber can be vulcanized together again, and finally a sheath layer with reliable mutual adhesion is obtained.

10. A method for preparing a winding and trailing cable according to claim 9, characterized in that: The formula ingredients of the semi-conductive chloroprene rubber are shown in Table 1 below: Table 1

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