CN202102791U - Power cable for underwater shovel arm of dredger - Google Patents

Abstract

The utility model relates to a power cable for an underwater shovel arm of a dredger. The cable core includes three main wire cores and three ground wire cores twisted with each other. There is a rubber saddle-shaped fixing frame, and the center of the rubber saddle-shaped fixing frame is provided with a tensile core, and the outer layer of the tensile core is provided with a tensile core insulation layer; the center of each main core is the main core conductor, and the outer circumference of the main core conductor is wrapped with a main core Halogen-free tape, the outer periphery of the main wire core halogen-free tape is extruded with the main wire core insulation layer, and the outer periphery of the main wire core insulation layer is wrapped with the main wire core semi-conductive scraping tape; There is an insulating layer of the ground core, and the outer circumference of the insulating layer of the ground core is wrapped with a semi-conductive scraping tape for the ground core; the outer circumference of the cable core is extruded with a double-layer rubber sheath, and the circumference between the double-layer rubber sheaths is longitudinally wrapped with a soft fiber paper. The power cable has stable structure, reliable insulation, high tensile strength, aging resistance and easy bending.

Description

Power cable for underwater shovel arm of dredger

technical field

The utility model relates to a power cable, in particular to a power cable for an underwater shovel arm of a dredger.

Background technique

The power cable for the underwater shovel arm of the dredger works underwater, so the insulation performance of the cable is high, and the cable needs to be bent and elongated frequently with the movement of the shovel arm, so the cable structure is required to be stable and have good mechanical properties , high tensile strength, easy to bend with the shovel arm, and the cable core cannot undergo large deformation after bending, etc. Ordinary power cables cannot meet the above requirements.

Utility model content

The primary purpose of the utility model is to provide a power cable for the underwater shovel arm of a dredger, which has a stable structure, reliable insulation, high tensile strength and is easy to bend.

In order to achieve the above purpose, the utility model provides a power cable for the underwater shovel arm of a dredger, the cable core includes three main wire cores and three ground wire cores twisted with each other, and the three main wire cores and three ground wire cores are Evenly staggered along the same circumference, the center of the cable core is provided with a rubber saddle-shaped fixing frame, the center of the rubber saddle-shaped fixing frame is provided with a tensile core, and the outer layer of the tensile core is provided with a tensile core insulation layer; the center of each main core is the main core conductor, the outer periphery of the main core conductor is wrapped with a main core halogen-free tape, the outer periphery of the main core halogen-free tape is extruded with a main core insulating layer, and the main wire The outer circumference of the core insulation layer is wrapped with a main core semi-conductive scraping tape; the center of each ground core is a ground core conductor, and the outer circumference of the ground core conductor is extruded with a ground core insulation layer, and the ground wire The outer periphery of the core insulation layer is wrapped with a ground wire core semi-conductive scraping tape; the outer periphery of the cable core is extruded with double-layer rubber sheaths, and the circumference between the double-layer rubber sheaths is longitudinally wrapped with soft fiber paper.

Compared with the prior art, the utility model has achieved the following beneficial effects: the outer circumference of the main core conductor is wrapped with the main core halogen-free tape to form an isolation layer, which can avoid the chemical reaction between the insulating layer and the conductor and affect the performance of the cable; Both are wrapped with semi-conductive scraping tape, and the semi-conductive scraping tape forms a shielding layer, which can effectively avoid partial discharge of cables and waste electric energy; During the use of the cable, the wire cores are greatly squeezed and deformed; a soft tensile core covered with insulation is placed in the middle of the saddle-shaped fixing frame to reduce the tensile force on the conductor during the cable operation; the circumferential upper longitudinal wrap between the double-layer rubber sheaths There is a soft fiber paper that forms a slip gap between the double layers of rubber to avoid stress on the conductors when the cable is bent.

As a preferred solution of the present utility model, the main line core conductor is formed by twisting one main line steel core and seven main line copper strands evenly distributed around the main line steel core; each main line copper strand consists of twenty Copper wires with a diameter of 0.45 mm are twisted; the steel core of the main line is formed by twisting eighteen high-strength stainless steel wires with a diameter of 0.26 mm in groups of three, a total of six groups. The main line core conductor adopts a mixed structural steel-copper conductor, which not only ensures the current carrying capacity, but also has high strength. It is stranded in concentric circles and has a stable structure. The main line steel core located in the center bears the main tension.

As a preferred solution of the present utility model, the ground wire core conductor is formed by twisting seven ground wire copper strands and six ground wire steel strands; among them, four ground wire copper strands are located in the center, and the remaining three ground wire copper strands are The strands and six ground wire steel strands are evenly staggered and wrapped in the outer layer; each ground wire copper strand is twisted by twenty-two copper wires with a diameter of 0.26mm; each ground wire steel strand The strands are twisted from three high-strength stainless steel wires with a diameter of 0.26mm. The ground wire core conductor adopts a mixed structural steel-copper conductor, which not only ensures the current carrying capacity, but also has high strength.

As a preferred solution of the present invention, the stranded pitch diameter ratio of the main core conductor is not more than 15 times; the thickness of the main core halogen-free tape is 0.1mm; the thickness of the soft fiber paper is 0.05mm; the The inner thickness of the double-layer rubber sheath is 1.5mm, and the outer thickness is 2.0mm.

Description of drawings

Fig. 1 is a structural schematic diagram of a power cable for an underwater shovel arm of a dredger of the present invention.

In the figure: 1 tensile core; 1a tensile core insulation layer; 2 rubber saddle-shaped fixing frame; 3 main core; 3a main core conductor; 3b main core halogen-free tape; 3c main core insulation layer; Tape; 4 ground core; 4a ground core conductor; 4b ground core insulation layer; 4c ground core semi-conductive scraping tape; 5 soft fiber paper; 6 double-layer rubber sheath.

Detailed ways

As shown in Figure 1, the power cable for the underwater shovel arm of the dredger of the utility model, the cable core includes three main wire cores 3 and three ground wire cores 4 twisted with each other, and the three main wire cores 3 and three ground wire cores 4 are along the same The circumference is evenly staggered, the center of the cable core is provided with a rubber saddle-shaped fixing frame 2, the center of the rubber saddle-shaped fixing frame 2 is provided with a tensile core 1, and the outer layer of the tensile core 1 is provided with a tensile core insulating layer 1a; The center of the main core 3 is the main core conductor 3a, the outer circumference of the main core conductor 3a is wrapped with a main core halogen-free tape 3b with a thickness of 0.1mm, and the outer circumference of the main core halogen-free tape 3b is extruded with a main core insulating layer 3c, the main core The outer periphery of the insulating layer 3c is wrapped with a main core semi-conductive scraping tape 3d.

The center of each wire core 4 is a ground wire core conductor 4a, the outer circumference of the ground wire core conductor 4a is extruded with a ground wire core insulating layer 4b, and the outer circumference of the ground wire core insulating layer 4b is wrapped with a ground wire core semi-conductive scraping tape 4c; The outer periphery of the cable core is extruded with a double-layer rubber sheath 6, the thickness of the inner layer is 1.5mm, and the thickness of the outer layer is 2.0mm. The circumference between the double-layer rubber sheaths 6 is longitudinally covered with soft fiber paper 5 with a thickness of 0.05mm.

The main line core conductor 3a is formed by twisting one main line steel core and seven main line copper strands evenly distributed around the main line steel core, and the twisted pitch ratio is not more than 15 times; each main line copper strand is composed of twenty Copper wires with a diameter of 0.45mm are twisted; the steel core of the main line is made of eighteen high-strength stainless steel wires with a diameter of 0.26mm twisted in groups of three, a total of six groups.

The ground wire core conductor 4a is formed by twisting seven ground wire copper strands and six ground wire steel strands; among them, four ground wire copper strands are located in the center, and the remaining three ground wire copper strands and six ground wire steel strands The wires are evenly staggered and wrapped in the outer layer; each ground copper strand is twisted by twenty-two copper wires with a diameter of 0.26mm; each ground steel strand is composed of three high-strength stainless steel wires with a diameter of 0.26mm Stranded.

In addition to the above embodiments, the utility model can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model.

Claims (4)

1. A power cable for the underwater shovel arm of a dredger, characterized in that: the cable core includes three main wire cores and three ground wire cores twisted with each other, and the three main wire cores and three ground wire cores are evenly staggered along the same circumference place, the center of the cable core is provided with a rubber saddle-shaped fixing frame, the center of the rubber saddle-shaped fixing frame is provided with a tensile core, and the outer layer of the tensile core is provided with a tensile core insulating layer; The center of the main core is the main core conductor, the outer periphery of the main core conductor is wrapped with a main core halogen-free tape, the outer periphery of the main core halogen-free tape is extruded with a main core insulating layer, and the outer periphery of the main core insulating layer is The main wire core is wrapped with semi-conductive scraping tape; the center of each ground wire core is a ground wire core conductor, and the outer circumference of the ground wire core conductor is extruded with a ground wire core insulation layer, and the outer circumference of the ground wire core insulation layer The ground wire core is wrapped with semi-conductive scraping tape; the outer periphery of the cable core is extruded with double-layer rubber sheaths, and the circumference between the double-layer rubber sheaths is longitudinally wrapped with soft fiber paper. 2. The power cable for the underwater shovel arm of a dredger according to claim 1, wherein the main core conductor is composed of one main wire steel core and seven main wire copper wires uniformly distributed around the main wire steel core. The strands are twisted; each main copper strand is twisted by twenty copper wires with a diameter of 0.45mm; the steel core of the main line is made of eighteen high-strength stainless steel wires with a diameter of 0.26mm A total of six groups twisted together. 3. The power cable for the underwater shovel arm of a dredger according to claim 1, wherein the ground core conductor is formed by twisting seven ground copper strands and six ground steel strands Among them, four ground wire copper strands are located in the center, and the remaining three ground wire copper strands and six ground wire steel strands are evenly interlaced and wrapped in the outer layer; each ground wire copper strand is composed of twenty-two wires with a diameter of 0.26 mm copper wire twisted; each ground wire steel strand is twisted by three high-strength stainless steel wires with a diameter of 0.26mm. 4. The power cable for underwater shovel arm of dredger according to claim 1, characterized in that: the stranded pitch diameter ratio of the main core conductor is not more than 15 times; the thickness of the halogen-free belt of the main core is 0.1mm; the thickness of the soft fiber paper is 0.05mm; the inner thickness of the double-layer rubber sheath is 1.5mm, and the outer thickness is 2.0mm.

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