Flat cable with auxiliary cable

Abstract

Flat cable (100) comprising a flat cable sheath (2), a power wire (3) and an auxiliary wire (1) comprising: an auxiliary wire (11) formed by one wire or by several twisted wires; a loosely applied sheath protective layer (12) which is externally applied to the auxiliary wire (11) and is slidable relative to the auxiliary wire (11) along the length direction of the auxiliary wire (11); wherein the loosely applied sheath protective layer (12) is made of a high-molecular material by tube extrusion or formed by winding a steel wire around the auxiliary wire (11); wherein both the power wire (3) and the auxiliary wire (1) are present within the flat cable sheath (2) and the power wire (3) and the auxiliary wire (1) are arranged in parallel along the width direction of the flat cable sheath (2), wherein three power cores (3), namely a first power core, a second power core, and a third power core, are provided, wherein the first power core, the second power core, and the third power core are arranged at equal spacing along the width direction of the flat cable sheath (2), wherein an auxiliary line (1) is provided between the first power core and the second power core and between the second power core and the third power core, wherein the auxiliary line (1) between the first power core and the second power core is a control line that contacts the first power core from the outside and is arranged at a distance from the second power core; wherein the auxiliary line (1) between the second power core and the third power core is an optical fiber that contacts the third power core from the outside and is arranged at a distance from the second power core.

Description

The present invention relates to the technical field of cables, in particular to an auxiliary line having a loosely pushed-on sheath protection structure and a flat cable.Cables for electric shovels and electric drilling machines in mining or cables for coal cutters in underground construction or cable reels and tow cables for port cranes are not fixed in use and instead need to be displaced or moved. During displacement or movement of the cables, the cables are constantly subjected to tensile forces, rotational forces, bends, lateral compressive forces or shocks under the action of external forces, which results in control lines, communication lines, optical fibers and other auxiliary lines in cables being susceptible to breakage or damage, so that an entire cable no longer functions and therefore has to be scrapped. The reason for the susceptibility of the control lines, the communication lines, the optical fibers and the other auxiliary lines to damage is that, as compared to power lines in cables, such auxiliary lines are generally of very thin design. For example, a power line has a cross-sectional area of 185 mm 2 while a control line only has a cross-sectional area of 4 mm 2, a communication line only has a cross-sectional area of 0.5 mm 2 and an optical fiber naturally has a smaller diameter. Therefore, such auxiliary lines have a low tensile strength. If no special protective measures are present, such auxiliary lines are then rapidly damaged during use of the cables, whereby the service life of the cables is considerably impaired.WO 2004 / 086 418 A1 relates to a connecting line, in particular a carriage connecting line for the technical connection, which enables the supply and / or transmission of signals between the carriages of a train, comprising a multiplicity of cables stranded together. The object of the invention is to increase the functional reliability and service life of such a connecting line. For this purpose, at least one dimensionally stable channel is provided which extends with the stranded cable and into which one of the twisted cables is inserted with radial play.CN 1 14 999 718 A discloses an ultrastable composite fiber optic cable for coal mining machines comprising an outer sheath, the outer sheath being provided with a power line, a central fiber optic cable, a control line, a communication line and an optical cable twisted together to form a cable, the central fiber optic cable being arranged along the axis line of the outer sheath. The outer part of the central optical fiber is wrapped with a saddle support extruded and vulcanized from a semi-conductive polymer material. The power line, the control line, the communication line, and the optical cable are fixed to the outer wall of the saddle bracket.CN 1 09 003 716 A discloses a high strength composite drum movable power cable comprising a cable core, the cable core being formed by arranging three power cable cores and two control cables in parallel and equidistantly twisted at a distance of 2 mm; a flat outer protective layer of neoprene is extruded on the outside of a cable core, a flat glass fibre is wound on the outside of the outer protective layer, and a flat wire sheath layer of stainless steel is woven on the outermost layer.DE 69 832 933 T2 discloses a cable comprising a series of modules cast in an outer sheath, including at least one optical module resistant to compression, connected to at least one supple reinforcing module, in order to obtain a combination of high flexibility and resistance to compression. The reinforcement modules are made from tufts of microfiber that are not cured with resin.US 2019 / 0 056 278 A1 discloses a cable with a fiber optic sensor for strain measurement. The cable comprises a longitudinal structural element containing at least an electrical conductor and an optical conductor, and a strain sensor arranged in a bending neutral region of the cable and mechanically coupled to the longitudinal structural element. The strain sensor comprises an optical fiber coated with at least one coating layer, a release layer surrounding the coating layer, and a protective layer surrounding the release layer. The release layer comprises a material selected from a silicone polymer, a fluoropolymer blend, or an extruded polymer containing a lubricant.CN 1 06 373 660 A relates to a method for producing a photoelectric integrated cable having a spring-reinforced structure, characterized in that the cable is produced from the following steps: a step for producing a tightly buffered optical fiber, a step for producing a light guide unit, a step for producing a cable core, a step for forming a protective layer and a step for forming a protective layer. The present invention also discloses a photoelectric integrated cable having a spring armour structure. The manufacturing method of the present invention has the advantages of simplicity and ease of control, does not require a complex armor layer to form equipment, and saves equipment investment.US 2014 / 0 102 757A1 discloses a shielded power supply system that may comprise at least one unshielded power supply conductor and at least one grounded protection wire conductor arranged next to the at least one unshielded power supply conductor, wherein the at least one unshielded power supply conductor and the at least one grounded protection wire form a bundle.The present invention is based on the object of providing an auxiliary line with a loosely pushed-on sheath protection layer and a flat cable. With the sheath protection layer loosely fitted, a control line, an optical fiber and another auxiliary line can be effectively protected, and thus the service life of an auxiliary line is prolonged to solve the above-mentioned problem that existing auxiliary lines are usually rapidly damaged, thereby greatly impairing the service life of the cables.The present invention provides a flat cable comprising a flat cable jacket, a power wire and an auxiliary line, comprising:an auxiliary core formed by one core or by a plurality of twisted cores;a loosely sleeved sheath protection layer externally sleeved on the auxiliary wire and slidable relative to the auxiliary wire along the length direction of the auxiliary wire; wherein the loosely sleeved sheath protection layer is made of a high molecular material by tubular extrusion or formed by winding a steel wire around the auxiliary wire,wherein both the power wire and the auxiliary line are provided inside the flat cable jacket, and the power wire and the auxiliary line are arranged in parallel along the width direction of the flat cable jacket,wherein three power wires, namely a first power wire, a second power wire and a third power wire, are present, wherein the first power wire, the second power wire and the third power wire are arranged at the same distance along the width direction of the flat cable sheath, wherein an auxiliary line is present in each case between the first power wire and the second power wire and between the second power wire and the third power wire, wherein the auxiliary line between the first power wire and the second power wire is a control line which touches the first power wire from the outside and is arranged at a distance from the second power wire; wherein the auxiliary line between the second power wire and the third power wire is an optical fiber that contacts the third power wire from the outside and is arranged at a distance from the second power wire.It is optionally provided that the auxiliary line further comprises an outer protective layer made of high molecular weight material, which is pushed on the outside onto the loosely pushed-on sheath protective layer.Optionally, it is provided that the auxiliary line further comprises a shielding layer which is slid onto the outermost layer of the loosely slid-on sheath protection layer.Optionally, it is provided that, if the auxiliary line is a control line or a communication line, each of the wires comprises a wire conductor and a wire insulating layer, respectively, which is pushed onto the outside of the wire conductor; wherein, if the auxiliary line is an optical fiber, each of the wires comprises an optical fiber core and an optical fiber sleeve, respectively, which is pushed onto the outside of the optical fiber core.Optionally, it is provided that the flat cable jacket has a rectangular cross-sectional contour.Optionally, the power wire includes a power conductor, a power insulating layer, and a metal shield layer arranged in order from the inside to the outside.The present invention is distinguished from the prior art by the following technical effects:In the auxiliary line according to the invention, the auxiliary line is protected by sliding a loosely pushed-on sheath protection layer on the outside of the auxiliary wire and the durability of the auxiliary line is considerably improved, whereby the service life of the cable is substantially extended and the economic benefit for users is improved;Due to the prolonged service life of the cable, the production quantity of the cable is reduced, thus reducing the consumption of electrolytic copper and high molecular material. Copper is recovered by electrolysis with a high current consumption andHigh molecular weight materials are derived principally from petroleum, coal, natural gas and other non-renewable fossil energy sources. Therefore, by extending the service life of the cable, not only can users be made immediate use, but also energy saving and environmental protection can be promoted and a contribution to the low-carbon and eco-friendly economic environment can be made.In the flat cable of the present invention, the above auxiliary wire is provided with the sheath protecting layer loosely fitted thereon, whereby the service life of the cable is prolonged remarkably and the economic utility for users is improved.For better explanation of the embodiments in embodiments according to the present invention or in the prior art, accompanying drawings used in the embodiments will be briefly described below, it being understood that the following drawings represent only some embodiments of the invention and it is possible for those skilled in the art to obtain further drawings without inventive operations from such drawings. Shown therein are FIG. 1 is a schematic structural external view of an auxiliary line according to a first embodiment of the present invention; FIG. 2 is a schematic structural external view of another auxiliary line according to the first embodiment of the present invention; FIG. 3 is a schematic structural sectional view of an auxiliary pipe according to the first embodiment of the present invention; FIG. 4 is a schematic structural sectional view of a flat cable according to a second embodiment of the present invention; FIG. 5 shows a schematic structural sectional view of a round cable according to a third exemplary embodiment not according to the invention; FIG. 6 shows a schematic structural sectional view of a round cable according to a fourth exemplary embodiment not according to the invention; FIG. 7 shows a schematic structural sectional view of a round cable according to a fifth exemplary embodiment not according to the invention; FIG. 8 shows a schematic structural sectional view of a round cable according to a sixth exemplary embodiment not according to the invention; FIG. 9 is a schematic structural sectional view of a round cable according to a seventh exemplary embodiment not according to the invention;The following reference numerals are used therein:100. Flat cable; 200. round cable;1. Auxiliary line; 11th Auxiliary wire; 111. Conductor conductor; 112. Core insulation layer; 12th Loose-fit sheath protection layer; 13th Outer protection layer of high molecular material; 14th Shielding layer; 15th Optical fiber sleeve;2. flat cable jacket;3. Power wire; 31st power conductor; 32nd power insulating layer; 33rd metal shield layer; 34th power conductor shield layer; 35th insulating semiconducting shield layer;4. Round cable jacket;5. ground wire;6. Ground test line wire; 61st Ground test line conductor; 62th Ground test line insulating layer.In the following, embodiments of the exemplary embodiments according to the invention are explained fully and clearly on the basis of the accompanying drawings in the exemplary embodiments of the invention, wherein it is understood that the described exemplary embodiments represent only a part of the exemplary embodiments instead of all the exemplary embodiments.One of the objects of the present invention is to provide a flat cable having an auxiliary wire with a sheath protection layer loosely fitted thereon. With the sheath protection layer loosely fitted, a control line, a communication line, an optical fiber and another auxiliary line can be effectively protected, and thus the service life of an auxiliary line is extended to solve the problem that existing auxiliary lines are usually rapidly damaged, thereby greatly impairing the service life of the cables.In order to better understand the above object, features and advantages of the present invention, the invention is described in more detail below with reference to the attached drawings on the basis of specific embodiments.First EmbodimentAs shown in FIGS. 1 to 3, the present embodiment provides an auxiliary line 1. It comprises an auxiliary core 11 and a loosely pushed-on sheath protection layer 12. As can be seen from FIG. 1, the auxiliary core 11 consists of a core. As shown in FIG. 2, the auxiliary core 11 is formed by two twisted cores. If the auxiliary core 11 comprises three or more cores, the cores are usually twisted in contact with one another. The manner in which the auxiliary wire 11 is formed and twisted is part of the prior art and will not be explained in more detail here. The loosely pushed-on sheath protection layer 12 is pushed on the outside onto the auxiliary wire 11 and the inner diameter of the loosely pushed-on sheath protection layer 12 is slightly larger than the largest outer circumferential size of the auxiliary wire 11 in order to ensure that a free space remains between the loose pushed-on sheath protection layer 12 and the auxiliary wire 11 for a movement relative to one another. That is, in a normal use state, the auxiliary wire 11 can freely slide relative to the loosely fitted sheath protection layer 12 along the length direction of the auxiliary wire 11. The loosely fitted sheath protection layer 12 may be made of a high molecular material having a certain hardness by tubular extrusion or formed by winding a steel wire around the auxiliary wire 11; a round steel wire or a flat steel wire or another irregularly shaped steel wire may be used when a steel wire is used to produce the loosely fitted sheath protection layer 12. In this case, an intermediate space K must remain between two adjacent circles on which a steel wire is wound. The size of the clearance K is intended to meet the requirement of the bending radius of the auxiliary wire or cable. The loosely pushed-on sheath protection layer 12, which is produced from a high molecular weight material by tubular extrusion, is tubular and the above-mentioned intermediate space K does not have to be taken into account in this case. The high molecular weight material can be a thermoplastic material or else a crosslinked elastomer material. When the loosely pushed-on sheath protection layer 12 made of high molecular weight material is bent, no damage to the core is caused even in the case of friction between its inner wall and the auxiliary core 11 located therein.In the present embodiment, by disposing the auxiliary wire 11 of the auxiliary wire in the specially prepared loosely sleeve protecting layer 12, the thin wire of the auxiliary wire is protected in a cable, so that the thin wire in the cable can have better durability in the movable use of the cable, which is convenient for use for a long time and largely prevents damage. In addition to the extended service life of the auxiliary line, the service life of the cable is also extended, thus improving economic use. The thin wire in the cable is the auxiliary wire 11, which may be in detail a control line, a communication line, a single wire, a combination of multiple wires, etc. A thin core is characterized by a core cross-sectional area which is generally less than 10 mm 2 or is an optical fiber unit. By "mobile application of the cable" is meant that the cable is constantly displaced or moved in use, rather than being permanently laid. This is the case, for example, with cables for coal cutters and cables for electric shovels in coal mining. In some cables, they must be continuously unrolled or wound on cable drums, such as, for example, in cable reels on port cranes. Some cables must be laid in a tow carrier and moved continuously together with cable hooks, which is the case, for example, with tow cables.In the present exemplary embodiment, the auxiliary line further comprises an outer protective layer 13 made of high molecular weight material, which is pushed on the outside onto the loosely pushed-on sheath protective layer 12. The outer high-molecular-weight material protective layer 13 may be formed as a single-layer structure or a two-layer structure, made of rubber (e.g., ethylene-propylene rubber, chloroprene rubber, and chlorinated polyethylene rubber), elastomer, and another suitable high-molecular-weight material, and may be black, colored, semitransparent, or transparent in color; the outer high-molecular-weight material protective layer 13 may be disposed as needed, and may also be omitted as appropriate.In the present embodiment, the auxiliary line further comprises a shielding layer 14 which is slid onto the outermost layer of the loosely slid-on sheath protection layer 12. In the present embodiment, the outermost layer of the loosely pushed-on sheath protection layer 12 is its own outer layer if no outer protection layer 13 made of high molecular weight material is pushed on the outside of the loosely pushed-on sheath protection layer 12, so that the shielding layer 14 is pushed directly on the outside of the loosely pushed-on sheath protection layer 12; if the outer protection layer 13 made of high molecular weight material is pushed on the outside of the loosely pushed-on sheath protection layer 12, the outermost layer of the loosely pushed-on sheath protection layer 12 is the outer protection layer 13 made of high molecular weight material and the shielding layer 14 is pushed on the outside of the outer protection layer 13 made of high molecular weight material. The shielding layer 14 can be arranged as required and can also be omitted if necessary. The shielding layer 14, if provided, may be a metal wire mesh shielding layer, or may be a metal wire / fiber mesh shielding layer or a metal wire wound shielding layer. When the auxiliary line 1 is used in a cable, the shielding layer 14 is generally provided on the outermost layer.In the present embodiment, the auxiliary line 1 may be a control line, a communication line, or an optical fiber in detail. As a rule, when the auxiliary line 1 is a control line or a communication line, each of the wires comprises a wire conductor 111 and a wire insulating layer 112 which is pushed on the outside of the wire conductor 111 respectively; when the auxiliary line 1 is an optical fiber, each of the wires comprises an optical fiber core and an optical fiber sleeve 15 which is pushed on the outside of the optical fiber core respectively. When a plurality of optical fiber sleeves 15 are provided, the plurality of optical fiber sleeves 15 are twisted to form the auxiliary core 11. The manner in which the conductor of the control line, the communication line and the optical fiber is arranged is part of the prior art and is not explained in more detail here.The auxiliary line 1 can be used with existing cables. The cable core may contain only the auxiliary line 1. Alternatively, besides the auxiliary line 1, a power wire, a ground wire, and a ground test line wire may be further provided, among others. As a rule, the composition and the structure of the cable core should be selected depending on the installation and laying conditions of the cable. Depending on the use scenarios and the use environments, the cable can be round or even flat or otherwise irregularly shaped. In the case of a round cable, individual wires are twisted to form a cable core. In a flat cable, individual wires are arranged parallel to one another. In both cases, the core is sheathed from the outside by an outer cable protection layer.It is thus evident that in the present embodiment, by providing a special protective structure, namely the loosely pushed-on sheath protective layer 12, for the auxiliary line, the service life of the originally short-lived auxiliary line is extended considerably. Thus, the life of the entire cable is extended, the user is made of immediate economic benefit, and further a substantial contribution to the environmentally friendly and low carbon economics.In practical use, the loosely pushed-on sheath protection layer 12 is preferably produced from a high molecular weight material with a specific hardness by means of tubular extrusion and is thus distinguished from the steel wire winding technique by more mature technique, faster production speed, lower weight and easier realization of the lightweight construction of the cable.Second EmbodimentThe present embodiment proposes a flat cable 100. It includes a flat cable jacket 2, a power wire 3, and the auxiliary line 1 according to the first embodiment. Both the power wire 3 and the auxiliary wire 1 are embedded in the flat cable jacket 2, and the power wire 3 and the auxiliary wire 1 are arranged in parallel along the width direction of the flat cable jacket 2. The flat cable jacket 2 uses a conventional cable jacket material and has a non-circular and flat cross-section. For example, the cross-sectional contour is rectangular or elliptical. The flat structure of the flat cable 100 is suitable for reducing the outer diameter of the cable, and compared with conventional round cables, the bending radius can be decreased by 1 / 2. During the displacement, the cable is not twisted, which is expedient for lengthening the service life of the cable.As can be seen from FIG. 4, the flat cable jacket 2 has a rectangular cross-sectional contour. Three power wires 3, namely a first power wire, a second power wire and a third power wire, are provided. The first power wire, the second power wire, and the third power wire are arranged in order from left to right at an equal interval along the width direction of the flat cable sheath 2 (namely, the length direction of the rectangular cross-sectional contour). An auxiliary line 1 is provided in each case between the first power wire and the second power wire and between the second power wire and the third power wire, wherein the auxiliary line 1 between the first power wire and the second power wire is a control line which contacts the first power wire from the outside and is arranged at a distance from the second power wire, and the space between the control line and the second power wire is filled with the material of the flat cable sheath 2, thus forming a sheath reinforcing rib which constitutes a constituent part of the overall structure of the flat cable sheath 2. Accordingly, the auxiliary line 1 between the second power wire and the third power wire is an optical fiber that contacts the third power wire from the outside and is disposed spaced apart from the second power wire, and the space between the optical fiber and the second power wire is filled with the material of the flat cable sheath 2, thus forming a sheath reinforcing rib that constitutes a constituent part of the overall structure of the flat cable sheath 2.In the present embodiment, the power wire 3 includes a power conductor 31, a power insulating layer 32, and a metal shielding layer 33 that are arranged in order from the inside to the outside. If the voltage class of the cable is less than 3 kV, the power wire 3 can be configured as above. If the voltage class of the cable exceeds 6 kV, the power wire must additionally be provided with a shielding layer. For example, a power conductor shield layer 34 is additionally provided between the power conductor 31 and the power insulating layer 32, and an insulating semiconducting shield layer 35 is additionally provided between the power insulating layer 32 and the metal shield layer 33. That is, the power wire 3 thus formed includes, from the inside to the outside, the power conductor 31, the power conductor shielding layer 34, the power insulating layer 32, the insulating semiconducting shielding layer 35, and the metal shielding layer 33, respectively. the power wire 3 is a conventional constituent wire in a cable, and a detailed explanation about its concrete structure and operation principle is omitted here.In the present exemplary embodiment, the flat cable jacket 2 is generally designed as a single-layer jacket structure. The cladding layer of the single-layer cladding structure may be made of rubber (e.g., chloroprene rubber and chlorinated polyethylene rubber), elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color.In the flat cable 100 according to the present embodiment, inner wires are arranged in parallel side by side, which is useful for reducing the outer diameter of the cable, and thus realizes applicability to narrow space application scenarios. Compared to round cables, the bending radius can be reduced by 1 / 2. Further, the cable is prevented from being twisted even during a displacement after the installation and laying of the flat cable, so that the problem of the wire breakage due to the cable twisting is eliminated and the cable has a longer life.Third Embodiment Not According to the InventionThe present embodiment proposes a round cable 200. It comprises a cable core and a round cable sheath 4 which envelopes the cable core from the outside. The cable core is formed by twisting a power core 3, a ground core 5, a ground test line core 6, and the above-mentioned auxiliary line 1. Here, the power wire 3 is provided in a number of three, and the three power wires 3 are twisted in pairs contacting each other. The ground wire 5, the ground check line wire 6, and the auxiliary line 1 are each provided in a number of one. A space between each two adjacent power wires 3 contacts and accommodates the ground wire 5, the ground test line wire 6, and the auxiliary line 1 from the outside, respectively; the auxiliary line 1 is a communication line. The round cable 200 having a circular cross section is characterized by better resistance to crosswind.In the present embodiment, the power wire 3 includes a power conductor 31, a power insulating layer 32, and a metal shielding layer 33 that are arranged in order from the inside to the outside. If the voltage class of the cable is less than 3 kV, the power wire 3 can be configured as above. If the voltage class of the cable exceeds 6 kV, the power wire must additionally be provided with a shielding layer. For example, a power conductor shield layer 34 is additionally provided between the power conductor 31 and the power insulating layer 32, and an insulating semiconducting shield layer 35 is additionally provided between the power insulating layer 32 and the metal shield layer 33. That is, the power wire 3 thus formed includes, from the inside to the outside, the power conductor 31, the power conductor shielding layer 34, the power insulating layer 32, the insulating semiconducting shielding layer 35, and the metal shielding layer 33, respectively. the power wire 3 is a conventional constituent wire in a cable, and a detailed explanation about its concrete structure and operation principle is omitted here.In the present embodiment, the ratio of the pitch of the twist of the bundle of conductors of the power wire 3 to its diameter is between 2 and 30.In the present embodiment, the ratio of the winding height of the cable core to the diameter of the finished cable is between 2 and 12.In the present embodiment, the ground wire 5 is formed as a bare ground conductor or a ground conductor provided externally with a semi-conductive layer or an insulating layer.In the present embodiment, the ground test line wire 6 includes a ground test line conductor 61 and a ground test line insulating layer 62 that wraps the ground test line conductor 61 from the outside.In the present exemplary embodiment, the round cable jacket 4 can be designed as a two-layer or single-layer jacket structure. The single layer sheath layer may be made of rubber (e.g., chloroprene rubber and chlorinated polyethylene rubber), elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color; when the round cable sheath 4 uses a two layer sheath structure, it may include an inner sheath layer and an outer sheath layer externally sleeved on the inner sheath layer. Both the inner cladding layer and the outer cladding layer may be made of rubber, elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color. Between the inner cladding layer and the outer cladding layer, a reinforcing layer may be further provided, which may be, in detail, a fiber fabric reinforcing layer or a metal wire wound reinforcing layer. The above cladding layer may be disposed depending on design requirements and may also be omitted as appropriate.Compared to flat cables, the round cable 200 according to the present technical embodiment is characterized by better resistance to crosswind and smaller area of the cable on which the wind acts and is well suited for use in harbors, minings and other scenarios. In contrast to conventional cables, the round cable 200 of the present technical configuration additionally includes an independent ground line and a ground test line wire. Compared to a metal mesh which additionally serves as a ground line, the independent ground line is distinguished by a longer service life and better ground safety. With the additionally provided ground test line wire, the circuit safety of the ground test line wire can be tested in real time, whereby the safety performance of the cable is considerably improved.In practical application, depending on the actual need, it is conceivable that only one of the grounding wire 5 and the grounding test line wire 6 is provided in the round cable 200, or neither the grounding wire 5 nor the grounding test line wire 6 is provided. If one or both of the grounding wire 5 and the ground test line wire 6 are omitted, the respective position can remain empty or alternatively the auxiliary line 1, an optical fiber unit, a light band or another functional unit can be provided there instead.Fourth embodiment not according to the inventionThe present embodiment proposes a round cable 200. It comprises a cable core and a round cable sheath 4 which envelopes the cable core from the outside. The cable wire is formed by twisting a power wire 3, a ground wire 5, and the above auxiliary line 1. Here, the power wire 3 is provided in a number of three, and the ground wire 5 and the auxiliary line 1 are each provided in a number of one. The auxiliary line 1 is a control line or a communication line, and the auxiliary line 1 and the three power cores 3 are twisted in pairs contacting each other. The ground wire 5 is located in the middle of the auxiliary line 1 and the three power wires 3. As a preferred embodiment, it is provided that the auxiliary line 1 and the three power wires have the same outer diameter, as shown in FIG. 6, the ground wire 5 is located in the middle of the auxiliary line 1 and the three power wires 3, and both the first auxiliary line 1 and the three power wires 3 contact the ground wire 5 from the outside. In the above wire core, the connecting lines of the centers of the three power cores 3 and the auxiliary line 1 form a square. In the above cable core, the ratio of the twist height to the diameter is 9.In the present embodiment, the power wire 3 includes a power conductor 31, a power insulating layer 32, and a metal shielding layer 33 that are arranged in order from the inside to the outside. If the voltage class of the cable is less than 3 kV, the power wire 3 can be configured as above. If the voltage class of the cable exceeds 6 kV, the power wire must additionally be provided with a shielding layer. For example, a power conductor shield layer 34 is additionally provided between the power conductor 31 and the power insulating layer 32, and an insulating semiconducting shield layer 35 is additionally provided between the power insulating layer 32 and the metal shield layer 33. That is, the power wire 3 thus formed includes, from the inside to the outside, the power conductor 31, the power conductor shielding layer 34, the power insulating layer 32, the insulating semiconducting shielding layer 35, and the metal shielding layer 33, respectively. the power wire 3 is a conventional constituent wire in a cable, and a detailed explanation about its concrete structure and operation principle is omitted here.In the present embodiment, the ratio of the winding height of the twist of the power wire 3 to its diameter is between 2 and 30.In the present embodiment, the ground wire 5 is formed as a bare ground conductor or a ground conductor provided externally with a semi-conductive layer or an insulating layer.In the present exemplary embodiment, the round cable jacket 4 can be designed as a two-layer or single-layer jacket structure. The single layer sheath layer may be made of rubber (e.g., chloroprene rubber and chlorinated polyethylene rubber), elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color; when the round cable sheath 4 uses a two layer sheath structure, it may include an inner sheath layer and an outer sheath layer externally sleeved on the inner sheath layer. Both the inner cladding layer and the outer cladding layer may be made of rubber, elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color. Between the inner cladding layer and the outer cladding layer, a reinforcing layer may be further provided, which may be, in detail, a fiber fabric reinforcing layer or a metal wire wound reinforcing layer. The above cladding layer may be disposed depending on design requirements and may also be omitted as appropriate.Compared to flat cables, the round cable 200 according to the present technical embodiment is characterized by better resistance to crosswind and smaller area of the cable on which the wind acts and is well suited for use in harbors, minings and other scenarios. In contrast to conventional cables, the round cable 200 of the present technical configuration additionally has an independent ground line. Compared with a metal mesh which additionally serves as a ground line, the independent ground line is distinguished by a longer service life. Thus, the safety performance of the cable is improved significantly.Fifth, noninventive embodimentThe present embodiment proposes a round cable 200. It comprises a cable core and a round cable sheath 4 which envelopes the cable core from the outside. The cable core comprises the above-mentioned auxiliary line 1 and several other cores. A power line or another functional unit can be provided in the cable core as required. Regardless of how many power lines or other functional units are provided in the cable, the auxiliary line 1 can be arranged at any position in the cable core. As can be seen from FIG. 7, the cable core comprises two auxiliary lines 1, which are each located in the middle of the cable core or in an intermediate space between power cores on the outer periphery of the cable core.In the present exemplary embodiment, the round cable jacket 4 can be designed as a two-layer or single-layer jacket structure. The single layer sheath layer may be made of rubber (e.g., chloroprene rubber and chlorinated polyethylene rubber), elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color; when the round cable sheath 4 uses a two layer sheath structure, it may include an inner sheath layer and an outer sheath layer externally sleeved on the inner sheath layer. Both the inner cladding layer and the outer cladding layer may be made of rubber, elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color. Between the inner cladding layer and the outer cladding layer, a reinforcing layer may be further provided, which may be, in detail, a fiber fabric reinforcing layer or a metal wire wound reinforcing layer. The above cladding layer may be disposed depending on design requirements and may also be omitted as appropriate.In the round cable according to the present technical embodiment, the auxiliary line 1 is provided with the sheath protection layer loosely pushed on, whereby the service life of the cable is considerably extended and thus the economic benefit for users is improved.Sixth Embodiment Not According to the InventionThe present embodiment proposes a round cable 200. As shown in FIG. 8, the difference from the fifth embodiment is that the wire core includes an auxiliary line 1 located at the center of the wire core. On the outside of the auxiliary line 1, five wires such as power wires and a ground wire, which contact the auxiliary line 1, respectively, are provided.In the present exemplary embodiment, the round cable jacket 4 can be formed outside the cable core as a two-layer or single-layer jacket structure. The single layer sheath layer may be made of rubber (e.g., chloroprene rubber and chlorinated polyethylene rubber), elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color; when the round cable sheath 4 uses a two layer sheath structure, it may include an inner sheath layer and an outer sheath layer externally sleeved on the inner sheath layer. Both the inner cladding layer and the outer cladding layer may be made of rubber, elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color. Between the inner cladding layer and the outer cladding layer, a reinforcing layer may be further provided, which may be, in detail, a fiber fabric reinforcing layer or a metal wire wound reinforcing layer. The above cladding layer may be disposed depending on design requirements and may also be omitted as appropriate.In the round cable according to the present technical embodiment, the auxiliary line 1 is provided with the sheath protection layer loosely pushed on, whereby the service life of the cable is considerably extended and thus the economic benefit for users is improved.Seventh Embodiment Not According to the InventionThe present embodiment proposes a round cable 200. As shown in FIG. 9, the difference from the sixth embodiment is only due to the type and number of wires arranged on the outer periphery of the auxiliary line 1. The auxiliary line 1 is located in the middle of the cable core and outside around the auxiliary line 1, six power cores or other functional cores are provided.In the present exemplary embodiment, the round cable jacket 4 can be formed outside the cable core as a two-layer or single-layer jacket structure. The single layer sheath layer may be made of rubber (e.g., chloroprene rubber and chlorinated polyethylene rubber), elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color; when the round cable sheath 4 uses a two layer sheath structure, it may include an inner sheath layer and an outer sheath layer externally sleeved on the inner sheath layer. Both the inner cladding layer and the outer cladding layer may be made of rubber, elastomer and other suitable high molecular material and may be black, colored, semitransparent and transparent in color. Between the inner cladding layer and the outer cladding layer, a reinforcing layer may be further provided, which may be, in detail, a fiber fabric reinforcing layer or a metal wire wound reinforcing layer. The above cladding layer may be disposed depending on design requirements and may also be omitted as appropriate.In the round cable according to the present technical embodiment, the auxiliary line 1 is provided with the sheath protection layer loosely pushed on, whereby the service life of the cable is considerably extended and thus the economic benefit for users is improved.Eighth Embodiment Not According to the InventionThe present embodiment proposes a cable. It comprises a cable core comprising an auxiliary line 1 and other functional cores arranged externally around the auxiliary line 1.

Claims

A flat cable (100) comprising a flat cable jacket (2), a power wire (3), and an auxiliary wire (1) comprising: an auxiliary wire (11) formed by one wire or by a plurality of twisted wires; a loosely fitted sheath protection layer (12) externally fitted on the auxiliary wire (11) and slidable relative to the auxiliary wire (11) along the length direction of the auxiliary wire (11); wherein the loosely fitted sheath protection layer (12) is made of a high molecular material by tube extrusion or formed by winding a steel wire around the auxiliary wire (11); wherein both the power wire (3) and the auxiliary wire (1) are present inside the flat cable jacket (2), and the power wire (3) and the auxiliary wire (1) are arranged in parallel along the width direction of the flat cable jacket (2), wherein three power cores (3), namely a first power core, a second power core and a third power core, are present, wherein the first power core, the second power core and the third power core are arranged at the same distance along the width direction of the flat cable sheath (2), wherein an auxiliary line (1) is present in each case between the first power core and the second power core and between the second power core and the third power core, wherein the auxiliary line (1) is a control line which touches the first power core from the outside and is arranged at a distance from the second power core between the first power core and the third power core; wherein the auxiliary line (1) between the second power wire and the third power wire is an optical fiber which contacts the third power wire from the outside and is arranged at a distance from the second power wire.Flat cable (100) according to Claim 1, characterized in that it further comprises an outer protective layer made of high molecular weight material (13), which is pushed on the outside onto the loosely pushed-on sheath protective layer (12).Flat cable (100) according to claim 1 or 2, characterized in that it further comprises a shielding layer (14) which is slid onto the outer layer of the loosely slid-on sheath protection layer (12).

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