CN116994801A - Dragging cable for electric scraper and preparation method of outer sheath of dragging cable - Google Patents

Abstract

The invention discloses a trailing cable for an electric scraper and a preparation method of an outer protective layer thereof.A damping layer is arranged outside a cable core of the cable, the damping layer completely wraps a power wire, a ground wire and a control wire which are twisted into the cable core, and the damping layer sequentially and tightly wraps a braided reinforcing layer and the outer protective layer; the shock-absorbing layer and the outer protective layer are respectively formed by adopting modified nitrile rubber and antistatic chloroprene rubber materials through a rubber extrusion continuous vulcanization process. The number of the power wires is three, the number of the control wires is at least three, and the number of the ground wires is one; the control wire adopts double-wire or three-wire combination stranded to form a monitoring wire core group, the stranded pitch diameter ratio of the double-wire or three-wire combination stranded again is not more than 8 times, and enough gaps are formed in the control wire, so that the control wire can move freely when being extruded, bent and pulled by external force, and the situation of broken cores is effectively avoided. The damping layer wraps the cable core completely, and the damping layer and the reinforcing layer and the outer protective layer effectively ensure the structural reliability and performance stability of the cable together, so that the service life is effectively prolonged.

Description

Dragging cable for electric scraper and preparation method of outer sheath of dragging cable

Technical Field

The invention relates to the technical field of cable manufacturing, in particular to a trailing cable for an electric scraper and a preparation method of an outer sheath of the trailing cable.

Background

During construction, the electric scooptram needs to be connected to an external power source through a cable to ensure continuous power, so that towing the cable is one of the key technologies of the electric scooptram. The synchronous winding and unwinding problem of the towing cable along with the whole machine, namely, the cable is automatically and synchronously wound and unwound along with the advancing and retreating of the electric scraper, the cable is worn, towed and twisted to different degrees, and the abrasion of the cable sheath layer is mostly the abrasion caused by the contact with the ground; twisting and dragging are extremely easy to cause damage, bulge and conductor breakage of a cable sheath layer, and frequent replacement of the cable not only increases consumable cost, but also reduces production efficiency, thereby bringing great trouble to field staff. The special cable for the electric scraper in the conventional technology is generally low in drag resistance, torsion resistance and bending resistance in the use process and insufficient in wear resistance, so that the service life of the cable is not long.

Specifically, the existing scraper trailing cable has the following disadvantages:

1. from the structural design of the product, the trailing cable manufactured by adopting the prior art is formed by combining 3 power wire cores, 1 ground wire core, an inner liner layer, a reinforcing layer and an outer protection layer or 3 power wire cores, 3 ground wire cores, an inner liner layer, a reinforcing layer and an outer protection layer, and the trailing cable has single structure and function.

2. From the material selection of products, the 5 th soft round stranded soft copper conductor in GB/T3956-2008 is adopted as the conductor of the trailing cable manufactured in the prior art, meanwhile, a positive-negative type 'regularity' stranded mode is adopted as the conductor, when the cable is bent and twisted, when the bending radius of the cable is smaller than 6 times of the diameter of the cable, the strands between layers are easy to appear, and the situation of conductor breakage caused by 'displacement and sliding' difficulty and dislocation is easy to appear.

From the aspects of processing technology and physical and mechanical properties, the sheath material of the trailing cable sheath layer manufactured by the prior art is mostly thermoplastic polyurethane elastomer rubber (TPU), and the material has the outstanding characteristics of excellent wear resistance, excellent ozone resistance, high hardness, high strength, good elasticity, low temperature resistance and good oil resistance, chemical resistance and environmental resistance, but the thermoplastic polyurethane elastomer rubber (TPU) is poor in water resistance and flame retardance.

The towing cable manufactured in the prior art has not been related to antistatic performance, and the electric scraper towing cable is mostly constructed in a narrow space under the well, so that the working environment condition is severe. The surface resistance of the outer sheath material of the trailing cable exceeds 10 whether thermoplastic materials (plastics) or thermosetting materials (vulcanized rubber) are adopted ¹⁰ Omega, when the towing cable rubs with the ground during bending movement, high-voltage static electricity and electrostatic field are very easy to generate. The high-voltage static electricity and electrostatic field are very easy to cause fire and explosion accidents, interfere the work of electronic equipment and generate electric shock to human bodies.

Disclosure of Invention

The invention aims to provide a trailing cable for an electric scraper with good winding resistance, bending resistance and fatigue resistance and a preparation method of an outer protective layer of the trailing cable.

The invention provides a trailing cable for an electric scraper, which has the following technical scheme: the cable core of the cable is provided with a damping layer outside, the damping layer completely wraps the power wire, the ground wire and the control wire which are twisted into the cable core, and the damping layer sequentially and tightly wraps the braided reinforcing layer and the outer protective layer; the shock-absorbing layer is formed by adopting a modified nitrile rubber material through a rubber extrusion continuous vulcanization process, and the outer protective layer is formed by adopting an antistatic chloroprene rubber material through a rubber extrusion continuous vulcanization process. The number of the power wires is three, the number of the control wires is at least three, and the number of the ground wire wires is one; the control wires are twisted into the monitoring wire core group by adopting a double-wire combination or a triple-wire combination, and the twisting pitch diameter ratio of the double-wire combination or the triple-wire combination twisting again is not more than eight times.

When the technical scheme is implemented, the power wire is sequentially coated with the isolation layer and the insulation layer, and the insulation layer is formed by continuously vulcanizing ethylene propylene rubber through an extruder.

When the technical scheme is implemented, the conductor of the ground wire is coated with the insulating layer, and the insulating layer is formed by ethylene propylene rubber through a rubber extruder continuous vulcanization process.

When the technical scheme is implemented, the conductors of the control wires are sequentially coated with the insulating layer, the metal shielding layer and the sheath layer. The insulating layer is formed by ethylene propylene rubber through a rubber extruder continuous vulcanization process, the metal shielding layer is formed by knitting tinned copper wires, the knitting density is not less than 80%, and the sheath layer is formed by neoprene through a rubber extruder continuous vulcanization process.

When the technical scheme is implemented, the conductors of the control wire, the power wire and the ground wire are all soft tin-plated copper conductors formed by 6 th tin-plated soft copper; the soft tin-plated copper conductor is formed by twisting soft tin-plated round copper wire bundles into strands, wherein the pitch diameter ratio of the strands in the conductor of the power wire is not more than 19 times, the twisting pitch diameter ratio of the inner layer is 14-16 times, and the twisting pitch diameter ratio of the outer layer is 10-12 times.

When the technical scheme is implemented, the conductors of the ground wire and the control wire are formed by jointly combining soft tin-plated round copper wires and aramid yarns, the outer diameter of the multiple strands of the aramid yarns is not less than 1/5 of the total outer diameter of the conductor, the multiple strands of the aramid yarns are twisted and then arranged in the center of the conductor, the tin-plated copper wires are uniformly woven outside the aramid yarns in a weaving mode, the weaving angle is controlled to be 30-50 degrees, the weaving density is not less than 96%, and the specification of the aramid yarns is less than 1000D.

When the technical scheme is implemented, the knitting reinforcing layer is formed by knitting high-strength aramid ropes or high-strength nylon ropes, and the knitting density is 15% -50%.

The method for preparing the outer protective layer in the trailing cable for the electric scraper provided by the invention comprises the following steps of:

(1) Proportioning materials

10 parts of neoprene, 2 parts of an anti-aging agent HS-911, 30 parts of talcum powder, 2 parts of paraffin, 15 parts of plasticizer DOP, 8 parts of plasticizer paraffin base oil, 50 parts of nano kaolin, 20 parts of precipitated white carbon black, 20 parts of conductive carbon black, 1 part of a silane coupling agent KH-570, 5 parts of antimony trioxide, 1 part of stearic acid, 3 parts of a high-molecular antistatic agent, 5 parts of an anti-scorching agent HVA-2 1, 0.5 part of an accelerator TMTD, 4 parts of active magnesium oxide and 5 parts of active zinc oxide;

(2) Preparation of antistatic Neoprene

(2.1) placing neoprene into an open mill for plasticating, carrying out thin-pass and triangular wrapping for 3-5 times, and then cooling to the room temperature of 25+/-5 ℃;

(2.2) mixing the neoprene rubber after the plastic is well with a high molecular antistatic agent, paraffin, a plasticizer dioctyl ester, conductive carbon black, nano silicon dioxide, nano kaolin and an auxiliary agent in an internal mixer, wherein the temperature of the mixed rubber is not more than 130 ℃, and then further mixing and cooling the mixed rubber in an open mill, and cooling to 60-80 ℃;

and (2.3) finally adding the magnesium oxide, the zinc oxide and the HVA-2 into an open mill for uniform mixing, then placing the mixture into a calender for casting and forming to obtain a film, and cooling the film to obtain the antistatic chloroprene rubber sheath mixed rubber material.

According to the invention, through specific designs of the sheath, the reinforcing layer, the damping layer, the cable core and the conductive wire core, the dragging cable of the electric scraper has the characteristics of excellent pulling resistance, bending resistance, torsion resistance, abrasion resistance, static resistance, electric safety and the like. The outer protective layer is made of antistatic chloroprene rubber, has antistatic performance and physical and mechanical properties, so that the outer protective layer is moderate in elasticity and toughness, has extremely high compression resistance and abrasion resistance, can effectively avoid damage caused by compression and friction, and has good long-term antistatic performance, and fire and explosion accidents are effectively avoided. The damping layer inside the outer protective layer is made of modified Nitrile Butadiene Rubber (NBR), the loss factors of butyl rubber (HR) and Nitrile Butadiene Rubber (NBR) are maximum, the damping performance of the butyl rubber and the nitrile butadiene rubber is equivalent, but the butyl rubber is low in strength, small in elasticity and poor in adhesiveness, and cannot be tightly adhered with the outer protective layer. The acrylonitrile-butadiene rubber has excellent damping performance, and because the two structural units of acrylonitrile and butadiene monomers are randomly copolymerized, the low temperature resistance and the ozone resistance of the acrylonitrile-butadiene rubber are poor. The weaving enhancement layer between shock attenuation layer and the outer sheath is as cable support "skeleton" structure, has prevented the phenomenon of cable structure deformation in the in-process of towing, bending, torsion, prevents the damage that causes the insulated wire core because of the structure deformation. The weaving reinforcement can greatly improve the towing strength and bending performance of the cable. The cable core is not established the isolation layer, and the outer space of cable core lets the buffer layer fill completely, and cable core, buffer layer form an integral confined stable structure, and the buffer layer wraps up its in with the cable core is complete, and buffer layer rubber is with the insulating layer of power wire, the sheath layer of control wire completely gluing, and its product structure is compacter stable, stops the cable inside loss, effectively guarantees the structural reliability and the performance stability of cable together with enhancement layer, outer sheath, and life obtains effectively promoting.

Drawings

Fig. 1 is a schematic view of a trailing cable according to a preferred embodiment of the present invention.

Fig. 2 is an enlarged schematic view of the control wire of fig. 1.

Detailed Description

As shown in fig. 1, the trailing cable for an electric scraper disclosed in this embodiment, as shown in fig. 1, includes a power wire 1, a control wire 2, a ground wire 3, a shock-absorbing layer 4, a braided reinforcing layer 5, and an antistatic sheath layer 6.

In this embodiment, three power wires 1, one ground wire 3, and three control wires 2 are stranded into a wire core group, and are stranded to form a cable core, and the outside of the cable core is sequentially coated with a damping layer 4, a woven reinforcing layer 5 and an antistatic sheath layer 6.

The conductor of the power wire 1 is sequentially coated with an isolation layer and an insulation layer, and the insulation layer is formed by ethylene propylene rubber through a rubber extruder continuous vulcanization process.

The conductor of the ground wire 3 is coated with an insulating layer, and the insulating layer is formed by ethylene propylene rubber through a rubber extruder continuous vulcanization process.

The conductors of the power wire 1, the control wire 2 and the ground wire 3 are all soft tin-plated copper conductors formed by 6 th tin-plated soft copper, and the soft tin-plated copper conductors are formed by twisting soft tin-plated round copper wire bundles after being combined into a stranded wire. The pitch diameter ratio of the strands in the conductors of the power conductor is not more than 19 times, the twisting pitch diameter ratio of the inner layer is 14-16 times, and the twisting pitch diameter ratio of the outer layer is 10-12 times.

The control wire core conductor and the ground wire core conductor are formed by jointly combining soft tin-plated round copper wires and aramid yarns, wherein a plurality of strands of aramid yarns are twisted and then arranged in the center of the conductor, the outer diameter of the plurality of strands of aramid yarns is not less than 1/5 of the total outer diameter of the conductor, the tin-plated copper wires are uniformly woven outside the aramid yarns in a weaving mode, the weaving angle is controlled to be 30-50 degrees, the weaving density is not less than 96%, and the specification of the aramid yarns is less than 1000D.

As shown in fig. 2, the control wire 2 includes an aramid yarn 21, a conductor 22, an insulating extrusion layer 23, a metal shielding layer 24, a sheath layer 25 and an outer sheath layer 26; the insulating layer is formed by ethylene propylene rubber through a rubber extruder continuous vulcanization process, the sheath layer and the outer sheath layer are formed by chloroprene rubber through a rubber extruder continuous vulcanization process, the metal shielding layer is formed by knitting tinned copper wires, and the knitting density is not less than 80%.

In this embodiment, the three control wires 2 are respectively twisted into a core group by adopting a double-wire combination mode, and the control wires in other embodiments can also be twisted into a core group by adopting a three-wire combination mode, wherein the twisting pitch diameter ratio of the first twisting of the double-wire combination or the three-wire combination is not more than 10 times, and the twisting pitch diameter ratio of the second twisting of the double-wire combination or the three-wire combination is not more than 8 times.

The control wire 2 adopts a double-wire combination or triple-wire combination technology, and has enough gaps inside, so that the control wire can move freely when being extruded, bent and pulled by external force, and the situation of core breakage of the control wire is effectively avoided.

The knitting reinforcing layer is formed by knitting high-strength aramid ropes or high-strength nylon ropes, and the knitting density is 15% -50%. The braided reinforcing layer serves as a skeletal support unit for the cable.

The preparation of the outer protective layer in the trailing cable comprises the following steps:

(1) Proportioning materials

10 parts of neoprene, 2 parts of an anti-aging agent HS-911, 30 parts of talcum powder, 2 parts of paraffin, 15 parts of plasticizer DOP, 8 parts of plasticizer paraffin base oil, 50 parts of nano kaolin, 20 parts of precipitated white carbon black, 20 parts of conductive carbon black, 1 part of a silane coupling agent KH-570, 5 parts of antimony trioxide, 1 part of stearic acid, 3 parts of a high-molecular antistatic agent, 5 parts of an anti-scorching agent HVA-2 1, 0.5 part of an accelerator TMTD, 4 parts of active magnesium oxide and 5 parts of active zinc oxide;

(2) Preparation of antistatic Neoprene

(2.1) placing neoprene into an open mill for plasticating, carrying out thin-pass and triangular wrapping for 3-5 times, and then cooling to the room temperature of 25+/-5 ℃;

(2.2) mixing the neoprene rubber after the plastic is well with a high molecular antistatic agent, paraffin, a plasticizer dioctyl ester, conductive carbon black, nano silicon dioxide, nano kaolin and an auxiliary agent in an internal mixer, wherein the temperature of the mixed rubber is not more than 130 ℃, and then further mixing and cooling the mixed rubber in an open mill, and cooling to 60-80 ℃;

and (2.3) finally adding the magnesium oxide, the zinc oxide and the HVA-2 into an open mill for uniform mixing, then placing the mixture into a calender for casting and forming to obtain a film, and cooling the film to obtain the antistatic chloroprene rubber sheath mixed rubber material.

In the refining process, the conductive carbon black and the macromolecular antistatic agent are added into an internal mixer for mixing, so that the conductive performance of the conductive carbon black and the macromolecular antistatic agent are effectively integrated. The polymer antistatic agent is an internal addition type antistatic agent, has better compatibility with the matrix rubber, can be continuously migrated to the surface in the product to form an antistatic layer, and has longer lasting effect. The conductive carbon black maintains the network channels of the space inside the sheath layer. Compared with the single-use conductive carbon black antistatic rubber, the rubber used by the conductive carbon black and the high-molecular antistatic agent can achieve the antistatic effect by adding a small amount of conductive carbon black and the high-molecular antistatic agent, and has less negative influence on the mechanical properties such as strength, toughness and the like of a rubber matrix and also has less influence on the flame retardant property of the rubber.

S01, preparing a power wire;

A. drawing copper wires according to process requirements after the oxygen-free copper rods are inspected to be qualified, annealing and tinning the copper wires, and twisting the copper wires into conductors according to the process requirements;

B. wrapping an isolation layer outside the prepared conductor to prevent the isolation layer from penetrating into the twisted gaps of the wire core, wherein the isolation layer completely wraps the conductor in a manner of overlapping wrapping;

C. extruding the insulating rubber through a continuous sulfur rubber extruder, wrapping the insulating rubber outside the inner isolation layer, and completely vulcanizing the insulating layer rubber through saturated steam at high temperature and high pressure; the concentricity of the insulating layer and the conductor is ensured to be more than or equal to 90 percent by adjusting the machine head and the die thereof;

D. c, carrying out a soaking alternating current voltage test on the power wire which is obtained in the step C and is qualified in measurement, wherein the purpose is to verify whether the electrical performance of the insulating layer meets the standard requirement, the tested voltage is 3.5kV, the time lasts for 4 hours, and the test result requires no breakdown condition of the insulating layer in the test process;

s02, preparing a ground wire;

(S02.1) drawing copper wires, annealing and tinning the copper wires according to the process requirements after the oxygen-free copper rods are inspected to be qualified, and twisting the copper wires into a conductor according to the process requirements;

B. extruding the insulating rubber through a continuous sulfur rubber extruder, wrapping the insulating rubber outside the inner isolation layer, and completely vulcanizing the insulating layer rubber through saturated steam at high temperature and high pressure; the concentricity of the insulating layer and the conductor is ensured to be more than or equal to 90 percent by adjusting the machine head and the die thereof;

s03, preparing a control wire;

in this step, the wire is prepared as follows:

A. drawing copper wires according to process requirements after the oxygen-free copper rods are inspected to be qualified, annealing and tinning the copper wires, and twisting the copper wires into conductors according to the process requirements;

B. extruding the insulating rubber through a continuous sulfur rubber extruder, wrapping the insulating rubber outside a conductor, and completely vulcanizing the insulating rubber through saturated steam at high temperature and high pressure; the concentricity of the insulating layer and the conductor is ensured to be more than or equal to 90 percent by adjusting the machine head and the die thereof;

C. c, carrying out a soaking alternating current voltage test on the conductor core which is obtained in the step B and is qualified in measurement, wherein the purpose is to verify whether the electrical performance of the insulating layer meets the standard requirement, the tested voltage is 2kV, the time lasts for 1h, and the test result requires no breakdown condition of the insulating layer in the test process;

D. back-twisting the control wires subjected to the voltage test on a cabling machine, wherein the back-twisting rate is 80% -100%, the control wires are twisted in a normal mode, and the twisting pitch diameter ratio of the twisting is not more than 8 times;

E. the high-speed braiding machine finishes metal braiding shielding of the cabled monitoring wire core group through braiding, and the monitoring wire core needs to be wrapped with a high-temperature isolation layer before and after braiding;

F. and extruding sheath rubber through a continuous sulfur rubber extruder, and completely wrapping the control cable core and the metal shielding layer.

S04, preparing a cable core:

and carrying out back-twisting on the prepared qualified power wire, control wire and ground wire on a cabling machine to form a cable core, wherein the ground wire is placed in the center of the cable core, the back-twisting rate is 80% -100%, the twisting direction is right, and the pitch diameter ratio of the cable core is not more than 9 times.

The cable core after being qualified in preparation is not required to be wrapped, when the shock absorption layer is extruded, the gap area of the cable core can be completely filled with the shock absorption layer rubber, the shock absorption layer and the insulating layer of the lead are completely adhered to form a complete structural whole, and the external damage resistance of the product caused by frequent bending and torsion can be improved.

S05, preparing a reinforcing layer:

the surface of the damping layer before the reinforcing layer is prepared is kept clean and sanitary, the high-strength aramid ropes or the high-temperature-resistant high-strength nylon ropes are uniformly woven on the damping layer through a braiding machine, the braided cable cores are not wrapped, and the braiding density of the reinforcing layer is 15% -50%. The braiding layer must be kept clean, and water, dust and greasy dirt cannot exist;

s06, extruding antistatic sheath rubber through a continuous sulfur rubber extruder, wrapping the surface of the reinforcing layer and the inner sheath outside the cable core, and completely adhering the reinforcing layer and the inner sheath by the outer sheath rubber, so that the product structure is more compact and stable.

Compared with the prior art, the invention has the following advantages:

the outer protective layer is made of antistatic chloroprene rubber, and the antistatic property and the physical and mechanical properties of the chloroprene rubber are adapted by introducing the high-molecular antistatic agent and the conductive carbon black, so that the outer protective layer has moderate elasticity and toughness, extremely high compression resistance and abrasion resistance, can effectively avoid damage caused by compression and friction, and simultaneously has good long-term antistatic property, and can effectively avoid fire and explosion accidents caused by high-voltage static electricity and electrostatic field.

The damping layer inside the outer protective layer is made of modified Nitrile Butadiene Rubber (NBR), the loss factors of butyl rubber (HR) and Nitrile Butadiene Rubber (NBR) are maximum, the damping performance of the butyl rubber and the nitrile butadiene rubber is equivalent, but the butyl rubber is low in strength, small in elasticity and poor in adhesiveness, and cannot be tightly adhered with the outer protective layer. The acrylonitrile-butadiene rubber has excellent damping performance, and because the two structural units of acrylonitrile and butadiene monomers are randomly copolymerized, the low temperature resistance and the ozone resistance of the acrylonitrile-butadiene rubber are poor.

The middle of the reinforcing layer adopts a high-strength multi-strand aramid fiber rope or high-strength nylon rope woven mesh layer as a cable support 'skeleton' structure, the structural strength of the cable is increased, the weaving density of the reinforcing layer is 15% -50%, and the damping layer rubber is tightly adhered with the outer protective layer rubber through gaps of the multi-strand aramid fiber yarn woven mesh layer, so that a closed integral structure is formed. The phenomenon of structural deformation of the cable in the dragging, bending and twisting processes is prevented, and damage to the insulated wire core caused by the structural deformation is prevented. The weaving reinforcement can greatly improve the towing strength and bending performance of the cable.

The cable core adopts the mode of not wrapping up to handle, and the outer space of cable core lets the buffer layer fill completely, and cable core, buffer layer form an integral confined stable structure, and the buffer layer wraps up its in with the cable core is complete, and buffer layer rubber is with the insulating layer of power wire, the restrictive coating of control wire completely gluing, and its product structure is compacter stable, stops the cable inside loss, effectively guarantees the structural reliability and the performance stability of cable together with enhancement layer, outer sheath, and life obtains effectively promoting.

After the control wires are twisted, a metal shielding layer and a sheath layer are arranged outside the control wires, before the control wires are subjected to metal shielding preparation, the monitoring wire cores are treated by using a release agent, the sliding performance inside the control wires is enhanced, and the conductor breakage condition caused by metal fatigue of the control wire conductors is avoided. The metal shielding is arranged outside the control wire, so that electromagnetic interference of a power wire or an external electromagnetic field to the control wire can be effectively prevented, and meanwhile, bending resistance, pulling resistance and torsion resistance of the control wire can be improved. The sheath layer of the control wire has good physical and mechanical properties of tensile strength, bending resistance, vibration resistance and torsion resistance. And simultaneously, the control wire can be protected from mechanical damage.

The cable was pulled by the electric scraper in this example, and the cable bending test and the winding test performance test (destructive test) were performed at an ambient temperature (25 ℃) as follows:

table 1 cable bending test

TABLE 2 winding test

It can be seen from tables 1 and 2 that the electric scraper trailing cable of this embodiment has good winding resistance, bending resistance and fatigue resistance.

Claims (8)

1. The utility model provides a drag cable for electric scooptram which characterized in that: the cable core of the cable is provided with a damping layer outside, the damping layer completely wraps the power wire, the ground wire and the control wire which are twisted into the cable core, and the damping layer sequentially and tightly wraps the braided reinforcing layer and the outer protective layer; the damping layer is formed by adopting a modified nitrile rubber material through a rubber extrusion continuous vulcanization process, and the outer protective layer is formed by adopting an antistatic chloroprene rubber material through a rubber extrusion continuous vulcanization process;

the number of the power wires is three, the number of the control wires is at least three, and the number of the ground wire wires is one; the control wires are twisted into the monitoring wire core group by adopting a double-wire combination or a triple-wire combination, and the twisting pitch diameter ratio of the double-wire combination or the triple-wire combination twisting again is not more than eight times.

2. The trailing cable for an electric scraper of claim 1, wherein: the power wire sequentially coats the isolation layer and the insulation layer, and the insulation layer is formed by ethylene propylene rubber through a rubber extruder continuous vulcanization process.

3. The trailing cable for an electric scraper of claim 1, wherein: and the conductor of the ground wire is coated with an insulating layer, and the insulating layer is formed by ethylene propylene rubber through a rubber extruder continuous vulcanization process.

4. The trailing cable for an electric scraper of claim 1, wherein: the conductor of the control wire is sequentially coated with an insulating layer, a metal shielding layer and a sheath layer, the insulating layer is formed by ethylene propylene rubber through a rubber extruder continuous vulcanization process, the metal shielding layer is formed by braiding tinned copper wires, and the braiding density is not less than 80%.

5. The trailing cable for an electric scraper of claim 1, wherein: the conductors of the control wire, the power wire and the ground wire are all soft tin-plated copper conductors formed by 6 th tin-plated soft copper; the soft tin-plated copper conductor is formed by twisting soft tin-plated round copper wire bundles into strands, wherein the pitch diameter ratio of the strands in the conductor of the power wire is not more than 19 times, the twisting pitch diameter ratio of the inner layer is 14-16 times, and the twisting pitch diameter ratio of the outer layer is 10-12 times.

6. The trailing cable for an electric scraper of claim 1, wherein: the conductors of the ground wire and the control wire are composed of soft tin-plated round copper wires and aramid yarns in a combined mode, the stranded aramid yarns are arranged in the center of the conductor, the outer diameter of the stranded aramid yarns is not smaller than 1/5 of the total outer diameter of the conductor, the tinned copper wires are uniformly woven outside the aramid yarns in a weaving mode, the weaving angle is controlled to be 30-50 degrees, the weaving density is not smaller than 96%, and the specification of the aramid yarns is smaller than 1000D.

7. The trailing cable for an electric scraper of claim 1, wherein: the braiding reinforcing layer is formed by braiding high-strength aramid ropes or high-strength nylon ropes, and the braiding density is 15% -50%.

8. A method of making the outer jacket of the trailing cable for an electric scraper of claim 1, comprising the steps of:

(1) Proportioning materials

10 parts of neoprene, 2 parts of an anti-aging agent HS-911, 30 parts of talcum powder, 2 parts of paraffin, 15 parts of plasticizer DOP, 8 parts of plasticizer paraffin base oil, 50 parts of nano kaolin, 20 parts of precipitated white carbon black, 20 parts of conductive carbon black, 1 part of a silane coupling agent KH-570, 5 parts of antimony trioxide, 1 part of stearic acid, 3 parts of a high-molecular antistatic agent, 5 parts of an anti-scorching agent HVA-2 1, 0.5 part of an accelerator TMTD, 4 parts of active magnesium oxide and 5 parts of active zinc oxide;

(2) Preparation of antistatic Neoprene

(2.1) placing neoprene into an open mill for plasticating, carrying out thin-pass and triangular wrapping for 3-5 times, and then cooling to the room temperature of 25+/-5 ℃;

(2.2) mixing the neoprene rubber after the plastic is well with a high molecular antistatic agent, paraffin, a plasticizer dioctyl ester, conductive carbon black, nano silicon dioxide, nano kaolin and an auxiliary agent in an internal mixer, wherein the temperature of the mixed rubber is not more than 130 ℃, and then further mixing and cooling the mixed rubber in an open mill, and cooling to 60-80 ℃;

and (2.3) finally adding the magnesium oxide, the zinc oxide and the HVA-2 into an open mill for uniform mixing, then placing the mixture into a calender for casting and forming to obtain a film, and cooling the film to obtain the antistatic chloroprene rubber sheath mixed rubber material.