CN210271840U

CN210271840U - Reinforced ultra-heavy portable cable for coal mine

Info

Publication number: CN210271840U
Application number: CN201921421855.6U
Authority: CN
Inventors: 杜亚红; 魏永乾; 刘瑞宁; 刘寒春
Original assignee: Lanzhou Zhongbang Wire & Cable Group Co ltd
Current assignee: Lanzhou Zhongbang Wire & Cable Group Co ltd
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-04-07
Anticipated expiration: 2029-08-29

Abstract

The utility model discloses a reinforced extra-heavy portable cable for coal mines, which comprises three power wire cores, a grounding detection wire and two grounding conductors, wherein the three power wire cores are arranged in a triangular shape, and the grounding detection wire and the grounding conductors are positioned in the clearance outside the phase wire cores and are in close contact with the metal shielding layers of the phase wire cores; an inner sheath, a braided reinforcing layer and an outer sheath are sequentially arranged outside the power wire core, the grounding detection wire and the grounding lead; the power wire core sequentially comprises a conductor, a conductor shielding layer, an insulating shield and a metal shielding layer from inside to outside; the ground detection line includes a ground detection line conductor and a ground detection line insulation layer. Through above-mentioned design, can guarantee whole tensile resistance and the wearability of cable effectively, show the tensile strength and the life who have improved the cable, can be suitable for the requirement of special occasion to portable cable completely.

Description

Reinforced ultra-heavy portable cable for coal mine

Technical Field

The utility model relates to a strenghthened type extra heavy portable cable for coal mine, this heavy cable are applicable to rated voltage 8.7/10kV and following coal-winning machine and mobile device, the powerful long arm coal-winning machine of mainly used, continuous miner and mobile device are in the abominable use occasion in the open air such as excavator, dredge and rig, are applicable to metallurgy, mine, oil.

Background

The cable is used as an infrastructure in a matching mode, at present, imported equipment is mostly adopted by coal mine enterprises, and due to the fact that the equipment is used in special occasions, the adopted rubber sleeve cable is high in performance requirement, such as high abrasion resistance, high flexibility, bending resistance, abrasion resistance, corrosion resistance, oil resistance and long service life. This puts higher demands on the structural design and material selection of the cable.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a reinforced extra-heavy portable cable for coal mines, which comprises three power wire cores, a grounding detection wire and two grounding conductors, wherein the three power wire cores are arranged in a triangle, and the grounding detection wire and the grounding conductors are positioned in the gap outside the phase wire cores and are in close contact with the metal shielding layers of the phase wire cores; an inner sheath, a braided reinforcing layer and an outer sheath are sequentially arranged outside the power wire core, the grounding detection wire and the grounding lead;

the power wire core sequentially comprises a conductor, a conductor shielding layer, an insulating shield and a metal shielding layer from inside to outside;

the ground detection line includes a ground detection line conductor and a ground detection line insulation layer.

Preferably, the conductor is a category 6 tinned soft conductor required by GB/T3956-.

Preferably, the conductor shield adopts a tape-extrusion combined shield, the tape adopts a reinforced semiconductive nylon tape to be directly lapped on the conductor, the shielding layer adopts 10kV grade ethylene-propylene-diene monomer type semiconductive inner shielding material to be extruded, and the conductor shield can play a role of uniform electric field;

the insulating layer is extruded by a 10kV high-voltage cable with an ultra-high strength ethylene propylene diene monomer rubber;

the insulation shield adopts 10kV ethylene-propylene-diene monomer type semi-conductive outer shielding material.

Preferably, the metal shielding layer adopts a tinned copper wire and fiber yarn weaving structure to prevent external electromagnetic interference.

Preferably, the grounding detection line conductor is a category 6 tinned soft conductor required by GB/T3956-.

Preferably, the ground wire conductor is a category 6 tinned soft conductor required by GB/T3956-.

Preferably, the inner sheath layer adopts heavy chlorinated polyethylene rubber, so that the roundness of the cable core can be ensured, and the abrasion of the shielding layer to the outer sheath is prevented.

Preferably, the reinforcing layer is of an aramid yarn woven structure.

Preferably, the outer sheath layer is made of an ultra-heavy chlorinated polyethylene rubber material.

Through above-mentioned design, can guarantee whole tensile resistance and the wearability of cable effectively, show the tensile strength and the life who have improved the cable, can be suitable for the requirement of special occasion to portable cable completely.

The utility model discloses mining strenghthened type overweight portable cable can bear characteristics such as high strength, high abrasion, bending repeatedly completely, can be applied to special occasion completely to the operation requirement of portable cable, can effectively guarantee the life of product.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is the utility model relates to a structure schematic diagram of strenghthened type extra heavy portable cable for coal mine.

In the figure, 1, a grounding detection line conductor 2, a grounding detection line insulator 3, a phase core conductor 4, a phase core conductor shield 5, a phase core insulator 6, a phase core insulator shield 7, a phase core composite shield 8, a grounding wire 9, an inner sheath 10, a braided reinforcement layer 11 and an outer sheath.

Detailed Description

As shown in figure 1, the utility model discloses a strenghthened type extra heavy portable cable for coal mine.

In order to achieve high wear resistance, high flexibility and tensile resistance of the cable and prolong the service life of the cable, the applicant selects the following materials to manufacture the cable.

1. A phase core conductor: the type 6 tinned soft conductor required by GB/T3956-. (tin-plated copper conductor can effectively prevent the conductor from generating corrosion and oxidation phenomena under severe environment)

2. Conductor shielding: a tape-extrusion combined shielding is adopted, the tape is directly lapped on a conductor in an overlapping mode through a reinforced semiconductive nylon tape, a 10 kV-level ethylene-propylene-diene monomer semiconductive inner shielding material is then adopted to extrude a shielding layer, and the conductor shielding can play a role in uniform electric field.

3. Insulating layer: the rubber is extruded by the ultra-high-strength ethylene propylene diene monomer rubber for the 10 kV-level high-voltage cable, has excellent electrical insulation performance, good ageing resistance, weather resistance and chemical corrosion resistance and has strong impact elasticity.

4. Insulating shielding: a10 kV-level ethylene-propylene-diene monomer type semi-conductive outer shielding material is adopted, and a conductor shielding layer, an insulating layer and an insulating shielding layer are subjected to a three-layer co-extrusion process and are subjected to totally-closed vulcanization.

5. A metal shielding layer: the phase wire core adopts a tinned copper wire and fiber yarn weaving structure to prevent external electromagnetic interference.

6. And (3) grounding a detection line: the conductor is formed by stranding a plurality of strands of type 6 tinned soft conductors required by GB/T3956-. (the tin-plated copper conductor can effectively prevent the conductor from generating corrosion and oxidation phenomena under severe environment). The insulation material is made of polypropylene insulation material, and the material has the advantages of small density, high strength, high hardness, good elasticity, outstanding bending fatigue resistance and difficult damage caused by repeated bending. And has a certain degree of impact resistance, strong mechanical property and resistance to corrosion of various organic solvents and acid and alkali. The polypropylene material hardly absorbs water, has no influence of humidity on the insulating property, and is suitable for insulating layer materials of underground cables.

7. Grounding: the conductor is formed by stranding a plurality of strands of type 6 tinned soft conductors required by GB/T3956-. (the tin-plated copper conductor can effectively prevent the conductor from generating corrosion and oxidation phenomena under severe environment).

8. Inner protecting layer: the adoption of the heavy chlorinated polyethylene rubber can ensure the roundness of the cable core and prevent the abrasion of the shielding layer to the outer sheath.

9. Reinforcing layer: the aramid fiber yarn woven structure is adopted, the mechanical strength and the tensile resistance of the cable are greatly improved, and the overall tensile resistance of the cable is 2-3 times that of a common cable due to the stable structure and uniform stress. (aramid fiber is a synthetic fiber, has the excellent performances of super high strength, high modulus, high temperature resistance, acid and alkali resistance, light weight and the like, the strength of the aramid fiber is 5-6 times that of a steel wire, the modulus of the aramid fiber is 2-3 times that of the steel wire or glass fiber, the toughness of the aramid fiber is 2 times that of the steel wire, the weight of the aramid fiber is only about 1/5 times that of the steel wire, and the aramid fiber is not decomposed or melted at the temperature of 560 ℃)

10. An outer sheath layer: the rubber material of the extra heavy type chlorinated polyethylene can meet the requirements of heat resistance, oil resistance, chemical corrosion resistance, friction resistance and the like, and enhances the environmental tolerance.

The cable manufacturing process comprises the following steps:

1. a conductor: the conductors of the power wire core, the grounding detection wire and the grounding conductor all adopt the 6 th tinned soft copper conductor meeting the requirements of GB/T3956-. The twisted conductor should not have the phenomena of wire shortage, strand loosening and strand breaking, and has the defects of uniform and compact twisting, smooth surface, no oil stain, no burr and the like.

2. And (3) co-extrusion of three layers: the extruded conductor shield, insulation and insulation shield of the power wire core adopt a three-layer co-extrusion processing technology and are in full-closed steam crosslinking. Before the power wire core is extruded, a reinforced semiconductive nylon belt is directly overlapped and wrapped on the conductor, then a 10 kV-level ethylene propylene diene monomer rubber type semiconductive rubber is adopted to extrude the conductor shield, the thickness of any point of the belt-extrusion combined shield is not less than 0.6mm, and the outer side of the extruded conductor shield layer is smoothly contacted with the inner surface of the insulating layer. The insulation adopts 10 kV-level high-voltage reinforced ethylene propylene diene monomer (EPR) for cables, the tensile strength of the insulation is not less than 8.3Mpa, the tensile stress at 100% elongation is not less than 3.5Mpa, the elongation at break is not less than 150%, the minimum thickness of any point of the insulation layer is not less than the nominal value multiplied by 90% mm, and the eccentricity is not more than 10%. The insulation should be tightly bonded to the extruded conductor shield without visible air bubbles and blisters on the insulation cross section. The insulation shield is extruded by a 10 kV-level ethylene propylene diene monomer rubber type semi-conductive rubber, and the insulation shield can be stripped without damaging the insulation. All layers of the insulation shield, the insulation shield and the conductor shield need to be tightly coated, coke particles, air gaps or impurities cannot exist between each layer and each layer, the surface of a wire core is smooth, obvious twisted wire convex patterns do not exist, and sharp corners, particles, scorching or scratching marks do not exist.

3. A composite shielding layer: after the three layers of the power wire core are co-extruded, a reinforced semi-conductive nylon belt is lapped on the wire core in an overlapping mode, the overlapping width is not smaller than 10% of the width of the power wire core, a tinned copper stranded folded yarn and polyethylene terephthalate yarns are adopted to be in cross weaving to form a composite shield, and the copper stranded folded yarn is in cross weaving with the yarns in the right direction and the left direction to form a woven layer. The pitch of the braided layer is 4.5 times of the diameter of the pitch circle of the power wire core, and the coverage area of copper is not less than 84%. The power wire core is marked by adopting colored yarns wrapped in the composite shielding yarns, and the colored yarns are red, white and blue. The composite shielding structure can effectively prevent the interference of external electromagnetism to the cable and also improve the flexibility of the cable.

4. And (3) grounding a detection line: the polypropylene insulation material is adopted for extrusion coating, and the polypropylene insulation material has the advantages of small polypropylene insulation density, high strength, high hardness, good elasticity, outstanding bending fatigue resistance and difficult damage caused by repeated bending. The service life of the wire core can be effectively ensured.

5. Cabling: during cabling, the three power wire cores are sequentially arranged in the clockwise direction of red, white and blue, and the grounding detection line and the grounding lead are placed in the gap outside the phase wire core. The ground detection line is arranged between the gaps of the white power wire core and the blue power wire core. Two grounding wires are respectively arranged in the gaps of the blue, red and white wire cores and are in close contact with the metal shielding layer of the phase wire core. And all the wire cores and the filling material are twisted into a cable in the left direction, and the maximum cabling pitch is 21 times of the outer diameter of the phase wire core.

6. An inner sheath: the rubber is extruded by adopting a mixture of heavy chlorinated polyethylene rubber, the tensile strength of the rubber is not less than 13.5MPa, and the tensile stress at 200% elongation is not less than 4.0 MPa. The rubber clings to the cable cores without adhering to the cable cores and is embedded to fill the external gaps between the cable cores. The roundness of the cable core can be ensured, and the abrasion of the shielding layer to the outer sheath is prevented.

7. Reinforcing layer: the outer sheath is reinforced by adopting a multi-strand aramid fiber yarn cross weaving structure, the reinforcing layer is placed between 50% and 80% of the thickness of the outer sheath which is not less than the total thickness of the outer sheath, and the total thickness of the outer sheath comprises the thicknesses of the inner sheath and the outer sheath. The weaving pitch-diameter ratio is 2-4 times of the outer diameter of the cable core, the weaving coverage density is not less than 60%, the adhesion of the inner sheath and the outer sheath can be effectively ensured, and the tensile strength of the sheath is enhanced.

8. Outer sheath: the super heavy chlorinated polyethylene rubber mixture is extruded, the tensile strength is not less than 16.5MPa, the tensile stress at 200% elongation is not less than 5.0MPa, and the tear strength is not less than 8 kN/mm. An outer jacket is applied over the reinforcement layer and operatively bonded to the inner jacket underlying the reinforcement layer, the outer jacket having an average thickness no less than a specified nominal thickness, the minimum thickness at any point being no less than the nominal thickness x 90-0.1 mm. The outer sheath can meet the requirements of heat resistance, oil resistance, chemical corrosion resistance, wear resistance, oil resistance and the like, and the environmental tolerance is enhanced.

The applicant tests the main performances of stretch resistance, aging resistance, oil resistance, wear resistance and the like of the developed MCPTJB-GC-6/10kV 3 × 35+2 × 16+1 × 10 reinforced ultra-heavy portable rubber sleeve cable, and the result shows that all the performances are higher than the design requirements.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reinforced extra-heavy portable cable for coal mines is characterized by comprising three power wire cores, a grounding detection wire and two grounding leads, wherein the three power wire cores are arranged in a triangular shape, and the grounding detection wire and the grounding leads are positioned in a gap outside a phase wire core and are in close contact with a metal shielding layer of the phase wire core; an inner sheath, a braided reinforcing layer and an outer sheath are sequentially arranged outside the power wire core, the grounding detection wire and the grounding lead;

2. The enhanced extra-heavy portable cable for the coal mine as recited in claim 1, wherein the conductor is made of a category 6 tinned soft conductor required by GB/T3956-.

3. The reinforced extra-heavy portable cable for the coal mine according to claim 1, wherein the conductor shield is a tape-extrusion combined shield, the tape is directly lapped and wrapped on the conductor by adopting a reinforced semiconductive nylon tape, the shielding layer is extruded by adopting 10kV ethylene-propylene-diene-type semiconductive inner shielding material, and the conductor shield can play a role of a uniform electric field;

4. The enhanced extra-heavy portable cable for the coal mine according to claim 1, wherein the metal shielding layer is of a tinned copper wire and fiber yarn braided structure to prevent external electromagnetic interference.

5. The reinforced extra-heavy portable cable for the coal mine as recited in claim 1, wherein the ground detection line conductor is a category 6 tinned soft conductor required by GB/T3956-.

6. The enhanced extra-heavy portable cable for the coal mine as recited in claim 1, wherein the ground wire conductor is made of a category 6 tinned soft conductor required by GB/T3956 and 2008 and stranded by a plurality of strands.

7. The enhanced extra-heavy portable cable for the coal mine according to claim 1, wherein the inner sheath layer is made of heavy chlorinated polyethylene rubber, which can ensure the roundness of the cable core and prevent the outer sheath from being worn by the shielding layer.

8. The enhanced extra-heavy portable cable for the coal mine as claimed in claim 1, wherein the reinforcing layer is of an aramid fiber braided structure.

9. The enhanced extra-heavy portable cable for coal mines as claimed in claim 1, wherein the outer jacket layer is made of extra-heavy chlorinated polyethylene rubber.