ES1290140U - Double-sheathed spiral cable and manufacturing process therefor - Google Patents

Abstract

A double-sheathed spiral cable (100) and a manufacturing process therefor, which relate to the field of special cables. The double-sheathed spiral cable (100) comprises a cable core (102) formed by twisting several wire cores (101); the cable core (102) is wrapped in sequence with a tape layer (130), an inner sheath (140), and an outer sheath (150); and the material of the inner sheath (140) is polyester polyurethane, and the material of the outer sheath (150) is polyether polyurethane. The manufacturing process for the double-sheathed spiral cable (100) is as follows: twisting several wire cores (101) to form a cable core (102), and wrapping the cable core (102) to form a tape layer (130); wrapping the tape layer (130) with polyester polyurethane to form an inner sheath (140); wrapping the inner sheath (140) with polyether polyurethane to form an outer sheath (150) to obtain a linear cable (100); and spirally winding the cable (100) into shape. The double-sheathed spiral cable (100) has a low cost, is high in strength, with a good bending performance, and good roundness, and can meet the requirements of long-term stable use in frequent stretching and vibration conditions.

Description

DESCRIPTION

DOUBLE SHEATHED SPIRAL CABLE

CROSS-REFERENCE TO RELATED REQUESTS

The present description claims priority from China Patent Application No.

201910596771.4, filed with the China Patent Office on Jul 3, 2019 and entitled "Double-sheathed Spiral Cable and Manufacturing Process Thereof".

TECHNICAL SECTOR

The present description refers to the field of special cables, and particularly to a double-sheathed spiral cable and its manufacturing process.

BACKGROUND OF THE INVENTION

A spiral cable is also called a spring cable, which generally refers to a cable in a spiral state formed by subjecting a straight cable, formed by twisting multiple insulated wire cores, to a winding process. The spiral cable is a device connection line that works by using the elasticity of the spiral cable to realize the connection and transmission of power and signal in the process of a moving operation of a mobile device, and can quickly move back in a short time.

For a conventional spiral cable, the coating is made of single-layer polyether polyurethane, the tensile strength of the coating is insufficient, and during long-term use the elasticity of the cable is reduced due to frequent stretching and vibration, and the wire core cannot be protected effectively, which leads to short cable life and potential risks. Also, since the coating is extruded in a single layer, the roundness of the cable is poor; and since the cost of polyether polyurethane is relatively high, the cost of the cable is relatively high.

EXPLANATION OF THE INVENTION

The object of the present description includes, for example, to provide a double-sheathed spiral cable and its manufacturing process, which has low cost, high strength, good bending performance and good roundness, and can meet the requirement of long-term stable use. long term under the working conditions of frequent stretching and vibration.

The modalities provided by the present description are implemented as follows:

A double-sheathed spiral cable is provided, comprising a cable core formed by braiding a plurality of wire cores, wherein the cable core is covered with a layer of wrapping tape, an inner jacket and an outer jacket. in sequence, the inner lining material is polyester polyurethane (polyether-type polyurethane), and the outer lining material is polyether polyurethane (polyether-type polyurethane).

Optionally, the inner liner material is a thermoplastic polyester polyurethane elastomeric material; and the outer liner material is a thermoplastic polyether polyurethane elastomer material.

In the implementation process mentioned above, the inner liner material is polyester polyurethane elastomer material (TPU) with high strength and high elongation, which ensures the cyclic tension property and safety of the spiral cable; and the outer jacket material is a polyether polyurethane elastomer (TPU) material that is resistant to hydrolysis and low temperature, which ensures the cyclic tension property and durability of the spiral cable. The double-layer coating formed by the above two polyurethane materials can ensure the high strength and good bending performance of the spiral cable, and can effectively protect the core wire to prolong the service life of the spiral cable.

Optionally, the wire core comprises a conductor and an insulating layer wrapped around the conductor; optionally, the conductor is formed by stranded bunching of a plurality of copper wires, with a stranded bunching wiring ratio of not more than 20 times; and optionally, the insulating layer is made of PVC.

In the above-mentioned implementation process, a plurality of ultra-soft copper wires are integrated through bunching and twisting process, with the wiring ratio of bunching-twisting being strictly controlled within 20 times, which can ensure that the resulting conductor has relatively high flexibility and bending performance; and PVC with high wear resistance is used, which makes it easy to wind the conductor to form an insulating layer on the surface of the conductor and leads to a good shielding effect on the conductor.

Optionally, the number of wire cores is 7, the 7 wire cores are divided into two groups, with one group including 1 wire core and another group including 6 wire cores, and the 6 wire cores in the same group are arranged in a circumferential direction of the 1 wire core of another group.

Optionally, all of the plurality of wire cores are arranged in at least two layers, and the wire cores in each layer have the same twisting direction; and/or the wiring ratio of the twisting of the wire cores is 4-15 times. In the implementation process mentioned above, the insulated wire cores are evenly layered and twisted together, with the wire cores in each layer having the same twisting direction and with a twisting wiring ratio of 4-15 times, which facilitates the formation of the spiral cable and guarantees the bending performance of the spiral cable.

Optionally, the number of wire cores is 15, the 15 wire cores are divided into two groups, with a first group including 4 wire cores and a second group including 11 wire cores, the 4 wire cores of the first group are arranged in a ring shape and form an inner layer, and the 11 wire cores of the second group are arranged in a circumferential direction of the inner layer to form an outer layer.

Optionally, the outer diameters of the plurality of wire cores are not completely equal to one another.

Optionally, the material of the winding tape layer is polyester plastic, paper or non-woven fabric; and/or the winding tape layer is formed by winding and winding, and covers the cable core with a covering rate of 10% to 80%.

In the implementation process mentioned above, a winding tape is wound and wound on the cable evenly by a winding tape winding and winding process, and the winding tape covers the cable core with a coverage rate from 10% to 80%, so as to ensure the compactness and roundness of the plurality of wire cores stranded together.

Optionally, the thickness of the winding tape layer is 0.03 - 0.20 mm.

Optionally, the total thickness of the inner liner and the outer liner is 1.5mm - 2.0mm, wherein the thickness direction of the inner liner is its radial direction; and the thickness direction of the outer coating is its radial direction.

In the implementation process mentioned above, the total thickness of the inner lining and outer lining is 1.5mm to 2.0mm, which can guarantee the strength and bending performance of the formed spiral cable. If the total thickness is too large, the bending performance of the spiral cable cannot be guaranteed, so that it is not easy to form the spiral cable which is in a spiral shape, or the spiral cable is not easy to stretch and restore; and if the total thickness is too small, the strength of the spiral cable cannot be guaranteed.

Optionally, the thickness of the inner liner is 0.2-1.8mm, and optionally the thickness of the inner liner is 0.5-1.5mm.

Optionally, the thickness of the outer coating is 0.2-1.8 mm, and optionally, the thickness of the outer coating is 0.5-1.0 mm.

Optionally, the double-sheathed spiral cable is configured to be at least partially spiral-shaped.

Optionally, the outer diameter of the wire core is 2.0-4.0 mm.

The present description further provides a process for manufacturing the double-sheathed spiral cable provided above, which comprises the steps of: braiding a plurality of wire cores to form a cable core and forming a layer of winding tape that wrap the cable core;

winding the layer of wrapping tape with polyester polyurethane to form an inner liner;

winding the inner sheath with polyether polyurethane to form an outer sheath to obtain a straight cable; Y

form by spirally winding the cable.

In the implementation process mentioned above, a winding tape layer is formed outside the cable core, and then an inner polyester polyurethane coating and an outer polyether polyurethane coating are sequentially formed outside the winding tape layer. . The wire has good roundness and the spirally formed wire has low cost and high strength and can meet the requirement of long-term stable use under the frequent stretching and vibration working conditions.

Optionally, the winding tape layer winding forming method comprises: winding and winding a winding tape uniformly on the cable core by a winding and winding process so that the winding tape forms a winding tape layer , where the winding tape covers the cable core with a coverage rate of 10% - 80%.

In the implementation process mentioned above, the winding tape is evenly wound and wound on the cable core by the winding and winding process of the winding tape, the winding tape has a coverage rate of 10% - 80 %, and the winding and winding should allow the winding tape layer to be tight and flat, without corrugations and folds, to ensure the compactness of the stranded cable core.

Optionally, the method of forming the inner liner comprises: extrusion molding the inner liner out of the wrap tape layer by an extruder, with each section of the extruder having a temperature of 180°C-220°C, and an extruder machine head mold having a temperature of 180°C - 220°C;

and/or the method of forming the outer skin is: extrusion molding the outer skin out of the winding tape layer by the extruder, with each section of the extruder having a temperature of 180°C - 220°C , and the mold of the machine head of the extruder which has a temperature of 180 °C -220 °C.

In the implementation process mentioned above, the inner liner and the outer liner are formed by a double-layer extrusion process, to ensure the overall elasticity and strength of the liner.

Optionally, the spiral winding forming method comprises: winding the straight wire at least partially on a winding rod to form a spiral, then baking it at 130°C - 140°C for 60 min - 100 min, followed by cooling by air, optionally, the duration of air cooling is 4h - 5h; and the diameter of the winding rod is 3-4 times the outer diameter of the cable.

In the implementation process mentioned above, the wire is first coiled into a spiral shape, and then undergoes hot treatment and cold treatment, to shape the wire into a spiral wire, while maintaining roundness, strength and the bending performance of the cable.

The present disclosure further provides a manufacturing process for processing the double-sheathed spiral cable provided above, comprising: winding the cable core wrapping tape layer with polyester polyurethane to form an inner sheath; Y

winding the inner sheath with polyether polyurethane to form an outer sheath, to form a straight cable.

Optionally, the manufacturing process further comprises: shaping the straight cable by spiral winding.

Advantageous effects of embodiments of the present disclosure include, for example: In the implementation process described above, the inventors have found, in the implementation process of the present disclosure, that the polyester polyurethane has higher tensile strength and tear resistance, better wear resistance and lower price than polyether polyurethane, but polyester polyurethane is not resistant to hydrolysis. In view of the characteristics of the two polyurethane materials, in the present description, different polyurethane materials are used to manufacture a double-layer coating that guarantees the cyclic stress property (ie, bending performance) of the spiral cable, so that the spiral cable as a whole has elasticity, can be stretched to a certain extent in the length direction, and can return to the original spiral shape after removing the external force. In the above, the inner lining material is polyester polyurethane, and the outer lining material is polyether polyurethane, which not only leads to low cost, high tensile strength and tear resistance, and good sealing effect. protection on the core wire, but also allows the Double-layer sheathed cable has good bending and roundness performance, to meet the requirement of long-term stable use under the frequent stretching and vibration working conditions, which is especially suitable for use as special cables. eg ABS cables for trailers, and have a long service life.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present description, a brief description of the drawings required for use in the embodiments of the present description is given below. It should be understood that the following drawings only illustrate some of the embodiments of the present description and should not be considered as limiting the scope, and for a person skilled in the art, other drawings related to these drawings can be obtained without inventive effort.

Figure 1 is a schematic structural diagram of a double-sheathed spiral cable provided by the present disclosure;

Figure 2 is a sectional view of the double-sheathed spiral cable provided by the present description;

Figure 3 is a graph showing the linear relationship between the thickness of an inner liner and the bending times of the corresponding cable;

Figure 4 is a graph showing the linear relationship between inner liner thickness and corresponding cable cost reduction percentage;

Fig. 5 is a graph showing the linear relationship between the thickness of the inner liner and the bending times and chafing times of the corresponding cable; Y

Figure 6 is a schematic structural diagram of a variant structure of the double-sheathed spiral cable provided by the present description.

Reference signs:

100 - spiral cord;

101 - wire core;

110 - conductor;

120 - insulating layer;

102 - cable core;

130 - winding tape layer;

140 - inner lining; Y

150 - external lining.

DETAILED DESCRIPTION OF THE MODALITIES

Below, the technical solutions of the embodiments of the present description will be described with reference to the drawings of the embodiments of the present description.

In order to clarify the objectives, technical solutions and advantages of the embodiments of the present description, the technical solutions of the embodiments of the present description will be clearly and fully described below with reference to the drawings of the embodiments of the present description. Obviously, the described embodiments are some of the embodiments of the present description, rather than all of the embodiments. The components of the embodiments of the present disclosure described and illustrated in the drawings herein may generally be arranged and designed in a variety of different configurations.

Therefore, the following detailed description of embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the present claimed disclosure, but is only representative of selected embodiments of the present disclosure. All other modalities that are obtained by a person skilled in the art without inventive effort, on the basis of the modalities of the present description, will be covered by the scope of protection of the present description.

It should be noted that like reference signs and letters denote like items in the following drawings, and therefore, once a certain item is defined in one Figure, it need not be further defined or explained in subsequent Figures.

In describing the present description, it should be noted that the orientation or position relationship denoted by such terms as "center", "upper", "inner" and "outer" is based on the orientation or position relationship indicated by the drawings, or refers to the orientation or position relationship where the product of the present description is normally placed when in use, which only serves to facilitate the description of the present description and simplify the description, rather than to indicate or to suggest that the device or element mentioned must be in a particular orientation, or that it is built and operated in a particular orientation, and therefore cannot be construed as limiting the present description.

In the description of the present description, it should also be noted that, unless explicitly specified and defined in any other way, the term "provide" will be understood in a broad sense, which can refer, for example, to fixed connection, detachable connection or integral connection; can refer to mechanical connection or electrical connection; can refer to direct connection or indirect connection through an intermediate means; and can refer to the internal communication between two elements. A person skilled in the art could understand the specific meaning of the above term in the present description, according to specific situations.

It should be noted that the features of the embodiments of the present description can be combined with each other, if there is no conflict.

Referring to Figure 1 and Figure 2, a double-sheathed spiral cable 100 provided by the present disclosure is at least partially in a spiral shape, comprising a cable core 102 formed by braiding a plurality of coil cores. wire 101, the cable core 102 which is covered with a layer of winding tape 130, an inner sheath 140 and an outer sheath 150 from inside to outside in the above order. Inner liner 140 and outer liner 150 are made of thermoplastic polyurethane elastomeric materials, and optionally, inner liner 140 material is polyester polyurethane, and outer liner 150 material is polyether polyurethane.

It should be noted that, in the present description, the number of wire cores 101 is not particularly limited, as long as the plurality of wire cores 101 can be twisted together and can be wound into a spiral. In this embodiment, the number of wire cores 101 is 7, that is, the cable core 102 has a 7-core structure. Also, in the present description, the manner of arranging the plurality of wire cores 101 is not particularly limited, and the plurality of wire cores 101 is arranged in layers around the center line, which may be arranged in one layer, or it can be arranged in two or more layers. In this embodiment, the 7 wire cores 101 are arranged in one layer and twisted together; and the wire cores 101 generally have a stranding stranding ratio of 4-15 times, for example, a stranding stranding ratio of 4 times, 6 times, 8 times, 10 times, 12 times or 15 times.

In order to ensure that the double-sheathed spiral cable 100 can be formed and the requirement of long-term stable use in the working conditions can be met of frequent stretching and vibration, the material of the inner liner 140 may be a thermoplastic polyester polyurethane elastomer material, and may also be a high-strength, high-elongation polyester polyurethane elastomer material (TPU), such as Basf TDS-S85A- zn; and the material of the outer liner 150 may be a thermoplastic polyether polyurethane elastomer material, and may also be a low temperature resistant and hydrolysis resistant polyether polyurethane elastomer material (TPU), such as 1185 A 10HFFR000.

In this embodiment, the wire core 101 comprises a conductor 110 and an insulating layer 120 wrapped around the conductor 110. Optionally, the conductor 110 is formed by bunching-braiding a plurality of ultra-soft copper wires, for example, conductor 110 is formed by braiding a plurality of ultrafine Cat.6 ultra-soft copper wires that are formed in accordance with IEC 60228-2004; and the conductor 110 has a bunching-stranding stranding ratio of not more than 20 times, for example, the conductor 110 has a bunching-stranding stranding ratio of 5 times, 10 times, 15 times or 20 times. Optionally, the insulation layer 120 is made of highly wear resistant PVC, such as Cabopol FHI-9901-91A.

Generally, the wire core 101 has an outer diameter of 2.0-4.0 mm, and the cable core 102 has an outer diameter of 6.0-13.0 mm. It should be noted that the plurality of wire cores 101 does not have completely the same outer diameter, in other words, each wire core 101 is independent and its outer diameter can be designed as needed, and of course, the plurality of wire cores 101 wire 101 can be configured to have the same outside diameter, if required.

In the present description, the material of the winding tape layer 130 may be polyester plastic, paper or non-woven fabric; and the winding tape layer 130 is formed by winding and winding, and the winding tape layer 130 covers the peripheral surface of the cable core 102 and covers the cable core 102 with a coverage rate of 10% - 80%, for example, has a coverage rate of 10%, 20%, 30%, 40%, 50%, 60%, 70%, or 80% for cable core 102.

Generally, the thickness of the winding tape layer 130 is 0.03-0.20 mm.

In this embodiment, the total thickness of the inner liner 140 and the outer liner 150 is 1.0-2.5 mm, in other words, in the radial direction, the sum of the thickness of the liner inner liner 140 and the thickness of outer liner 150 is 1.0-2.5 mm, wherein the thickness of inner liner 140 is 0.2-1.8 mm, optionally, the thickness of inner liner 140 is 0.5- 1.5mm; and the thickness of outer liner 150 is 0.2-1.8mm, optionally, the thickness of outer liner 150 is 0.5-1.0mm. By reasonable distribution of the thickness of the inner coating 140 and the outer coating 150, the double-coated spiral cable 100 is not only relatively low in cost, but also relatively good in strength and bending performance.

Furthermore, the present description provides a process for manufacturing the double-sheathed spiral cable 100 described above, comprising the following steps:

Step (1), twisting 7 wire cores 101 to form a cable core 102, wherein the specific method may be as follows:

With copper wire bunching and stranding process, Cat.6 ultra-fine ultra-soft copper wires are bunched-stranded to form a 110 conductor, with the strand-bunched wiring ratio strictly controlled within 20 times, to ensure that the the conductor 110 has a relatively high flexibility and bending performance; With an extrusion process and by using a plastic extrusion machine, an insulated material is heated, plasticized, melted, and then uniformly extruded and wound on the conductor 110 to cover the peripheral surface of the conductor 110 to form an insulating layer 120, to obtain a wire core 101; and with the process of twisting and wiring and by using a wiring machine, 7 wire cores 101 are arranged in one layer and twisted together to form the wire core 102, with a twisting wiring ratio of 4- 15 times that of the cable core 102.

Step (2), winding the cable core 102 with a layer of winding tape 130, where the specific method may be as follows:

With the winding and winding process of the winding tape, a winding tape is evenly wound and wound on the cable core 102 by winding and winding the tape layer to form the winding tape layer 130, the tape The wrap tape has a coverage rate of 10% - 80%, and the wrap tape layer 130 should be tight and flat, without corrugation or folds.

Step (3), winding the wrap tape layer 130 with polyester polyurethane to form an inner liner 140, wherein the specific method is as follows:

TPU polyester elastomer material is used and extrusion molded out of the winding tape layer 130 by an extruder, each section of the extruder has a temperature of 180°C - 220°C, and a head mold of the extruder machine has a temperature of 180 °C - 220 °C.

Step (4), winding the inner sheath 140 with polyether polyurethane to form an outer sheath 150 to obtain a straight cable, wherein the specific method is as follows:

a polyether elastomeric material is used and is extrusion molded out of the inner liner 140 by the extruder, each section of the extruder has a temperature of 180°C - 220°C, and the mold of the extruder head has a temperature of 180 °C - 220 °C.

Step (5), forming by spirally winding the wire, where the specific method is as follows:

the cable is wound on a winding rod, so that the cable is formed at least partially in a spiral, where the diameter of the winding rod is 3-4 times the outer diameter of the cable, then the cable winding in the winding rod is fired in a high temperature furnace, with a firing temperature of 130°C - 140°C and a firing duration of 60-100 min; and after the completion of firing, the wire is cooled by air, optionally, the shaped wire is cooled by fan, with the cooling duration generally 4-5 hours, and the 100 double-sheathed spiral wire is obtained after the completion air cooling.

It should be noted that, at the time of winding the straight cable into a spiral cable, it is feasible to wind the entire straight cable onto the winding rod to form the entire straight cable into a spiral cable. Alternatively, the straight cable is partially wound on the winding rod, so that the resulting cable is partially spiral. The processing is performed according to the needs, which are not specifically limited in the present description.

Below, the influence of the thickness of the inner cladding 140 and the thickness of the outer cladding 150 on the bending performance of the cable was investigated by tests.

According to the manufacturing process described above, the total thickness of the inner liner 140 and outer liner 150 was controlled to 1.80mm, different double-sheathed spiral cables 100 were manufactured by adjusting the respective thicknesses of the inner liner 140. and outer sheath 150, and each double-sheathed spiral cable 100 was tested for the maximum amount of cyclic stretching. The results were shown in Table 1 below:

Table 1 Results of the correspondence between the inner coating 140 and the outer coating 150 with different thicknesses and the amount of cyclic stretching of the double-coated spiral cables 100

The graph of the linear relationship between the thickness of the inner lining 140 and the amount of cyclic stretching of the corresponding double-wrapped spiral cable 100 was plotted according to Table 1, that is, Figure 3, and in addition, the graph of linear relationship between the thickness of the inner jacket 140 and the percentage reduction in cost (the cost here refers only to the cost of the jacket materials) of the corresponding double jacketed spiral cable 100 relative to the double jacketed spiral cable 100 having a 0mm thick inner liner 140 and a 1.8mm thick outer liner 150, i.e. Figure 4.

As can be seen from Figure 3, on the premise that the total thickness of the inner liner 140 and outer liner 150 is fixed, the greater the thickness of the inner liner 140, the greater the amount of cyclic stretching of the cable. corresponding double-sheathed spiral cable 100, indicating that, compared with the sheath which is made of polyether polyurethane, the sheath which is made of polyester polyurethane can improve the bending performance of the double-sheathed spiral cable 100.

As can be seen from Figure 4, on the premise that the total thickness of the inner liner 140 and outer liner 150 is fixed, the greater the thickness of the inner liner 140, the lower the cost of the corresponding spiral cable 100. , indicating that, compared with the coating that is made of polyether polyurethane, the coating that is made of polyester polyurethane can reduce the cost of the double-sheathed spiral cable 100.

In addition, each of the double-sheathed spiral cables 100 was separately tested for galling resistance (that is, the wear resistance of the outer sheath 150) by galling resistance test, referring to the test standard “ISO 14572 2011-10 ”, in the wear resistance test by galling, the length of the outer liner 150 to be used was rubbed on sandpaper, and the results were shown in Table 2 The test results show that, under the premise that the total thickness of the inner liner 140 and outer liner 150 is fixed, the larger the thickness of the inner liner 140, and the smaller the thickness of the outer liner 150, poorer is the galling resistance of the spiral cable 100, as long as the total thickness of the inner liner 140 and the outer liner 150 is fixed.

Table 2 resistance to galling wear of different spiral cables

The resulting data of the galling wear resistance and cyclic stress property shown above are combined to form a graph showing the linear relationship between the thickness of the inner liner and the bending times and galling times of the corresponding cables, as shown in Figure 5.

According to the above test results, when the polyester polyurethane inner sheath 140 of a certain thickness is combined with the polyether polyurethane outer sheath 150 of a certain thickness, the cost of the double-sheathed spiral cable 100 is reduced, the The bending performance is improved, and the hydrolysis resistance of the 100 double sheathed spiral cable is good, which can meet the requirement of long-term stable use under the frequent stretching and vibration working conditions.

Referring to Fig. 6, the present description further provides a double-sheathed spiral cable 100 having substantially the same structure as the aforementioned double-sheathed spiral cable 100, except that, in the present description, the number of cores of wire 101 is 15, that is, the cable core 102 has a structure of 15 cores. The 15 wire cores 101 are arranged in two layers, specifically, it is possible that the middle 4 wire cores 101 are arranged in one layer to form an inner layer, the other 11 wire cores 101 are arranged outside the inner layer in the circumferential direction of the inner layer, and are arranged in a layer outside the inner layer to form an outer layer, and the wire cores 101 in each layer are twisted in the same direction.

Accordingly, the manufacturing process of the double-sheathed spiral cable 100 is substantially the same as the manufacturing process mentioned above, except that the cable core 102 is produced by uniformly stratifying and braiding the wire cores 101 by means of a stranding machine. Using a twisting and stranding process, each layer of wire cores 101 is twisted in the same direction, and each layer of 101 wire cores has a stranding ratio of 4-15 times.

In summary, for the double-sheathed spiral cable 100 and its manufacturing process provided by the present description, the double-sheathed spiral cable 100 has low cost, high strength, good bending performance and good roundness, and can meet the long-term stable use requirement under frequent stretching and vibration working conditions.

The descriptions above are only modalities of the present description, which are not used to limit the scope of protection of the present description. For a person skilled in the art, the present description may have various changes and variations. Any modification, equivalent substitution, improvement, etc., made within the spirit and principle of this description will be included in the scope of protection of this description.

Industrial Application

In summary, the present description provides a double-sheathed spiral cable 100 and its manufacturing process, which has low cost, high strength, good bending performance, and good roundness.

Claims (14)

1. A double-sheathed spiral cable, comprising a cable core formed by braiding a plurality of wire cores, wherein the cable core is covered with a layer of wrapping tape, an inner jacket and an outer jacket in sequence, wherein an inner liner material is polyester polyurethane, and an outer liner material is polyether polyurethane. 2. The double-sheathed spiral cable according to claim 1, wherein the inner sheath material is a thermoplastic polyester polyurethane elastomer material; and the outer liner material is a thermoplastic polyether polyurethane elastomer material. 3. The double-sheathed spiral cable according to claim 1 or 2, wherein each of the wire cores comprises a conductor and an insulating layer wrapped around the conductor; optionally, the conductor is formed by twisted bunching a plurality of copper wires, with a twisted bunching wiring ratio of no more than 20 times; and, optionally, a material of the insulating layer is PVC. 4. The double-sheathed spiral cable according to any of claims 1 to 3, wherein the wire cores are provided in an amount of 7, the 7 wire cores are divided into two groups, with one group including 1 wire core and another group including 6 wire cores, and the 6 wire cores in one group are arranged in a circumferential direction to the 1 wire core of another group. 5. The double-sheathed spiral cable according to any of claims 1 to 3, wherein the plurality of wire cores are arranged in at least two layers, and the wire cores in each layer have the same direction braided; and/or a wiring ratio of the twisting of the wire cores is 4-15 times. 6. The double-sheathed spiral cable according to claim 5, wherein the wire cores are provided in a quantity of 15, the 15 wire cores are divided into two groups, with a first group including 4 wire cores and a second group including 11 wire cores, the 4 wire cores of the first group are arranged in a ring shape and form an inner layer, and the 11 wire cores of the second group are arranged in a circumferential direction of the inner layer to form an outer layer. 7. The double-sheathed spiral cable according to any of claims 1 to 6, wherein the outer diameters of the plurality of wire cores are not completely equal to each other. 8. The double-sheathed spiral cable according to any of claims 1 to 7, wherein a material of the winding tape layer is polyester plastic, paper or non-woven fabric; and/or the winding tape layer is formed by winding and winding and covers the cable core with a coverage rate of 10% - 80%. 9. The double-sheathed spiral cable according to any of claims 1 to 8, wherein the thickness of the winding tape layer is 0.03-0.20 mm. 10. The double-sheathed spiral cable according to any of claims 1 to 9, wherein the total thickness of the inner sheath and outer sheath is 1.5mm-2.0mm, wherein the direction of the thickness of the inner lining is its radial direction; and a thickness direction of the outer coating is its radial direction. 11. The double-sheathed spiral cable according to claim 10, wherein the thickness of the inner sheath is 0.2-1.8 mm and, optionally, the thickness of the inner sheath is 0.5-1.5 mm. 12. The double-sheathed spiral cable according to claim 11, wherein the thickness of the outer sheath is 0.2-1.8 mm and, optionally, the thickness of the outer sheath is 0.5-1.0 mm. 13. The double-sheathed spiral cable according to any of claims 1 to 12, wherein the double-sheathed spiral cable is configured to have a spiral shape, at least partially. 14. The double-sheathed spiral cable according to any of claims 1 to 13, wherein the outer diameter of each of the wire cores is 2.0-4.0 mm. 1