A towline cable

Abstract

The utility model discloses a kind of towed chain cables, including longitudinally extending cable core, and by inner to outer in turn cladding in the cable core outside of tape layer, inner protective layer, braided layer and outer protective layer, cable core is twisted from at least two groups of conductive units and first tensile core, first tensile core is arranged in the center of cable core, and conductive unit is arranged in the periphery of first tensile core;The conductive unit is twisted from at least two insulated wire cores, and the insulated wire core includes second tensile core, and by inner to outer in turn cladding in the first insulating layer, conductive layer and second insulating layer outside second tensile core, and the conductive layer is twisted from metal wire cross braiding.The towed chain cable of the utility model solves the technical problem that conductor is twisted from metal wire in prior art and is prone to broken wire.

Description

Technical Field

[0001] This utility model belongs to the field of wire and cable technology, and specifically relates to a drag chain cable. Background Technology

[0002] With the deepening of my country's intelligent manufacturing industrial upgrading, the demand for industrial automation is constantly increasing. Currently, hundreds of smart factories and digital workshops have been built nationwide, covering industries such as automotive, electronics, and equipment manufacturing. Drag chain cables are specifically designed for dynamic applications, such as robots, CNC machine tools, and automated production lines. Drag chain cables are key components of intelligent equipment and must withstand harsh environmental factors such as repeated bending, abrasion, and oil contamination. However, the lifespan of drag chain cables has always been a pain point and challenge in the industry.

[0003] Chinese invention patent application publication number CN103295681A discloses a drag chain cable and its manufacturing process. The cable's structure includes a conductor, insulation, a tensile core, an inner sheath, and an outer sheath. The conductor is surrounded by irradiated ethylene propylene rubber insulation, which is then surrounded by a low-temperature resistant elastomer inner sheath. The inner sheath is surrounded by a soft polyurethane outer sheath. The manufacturing process involves: stranding tinned copper wire as the conductor using a wire and cable stranding machine; extruding environmentally friendly irradiated ethylene propylene rubber insulation onto the conductor using an extrusion machine; stranding high-strength tensile fiber filaments using a stranding machine; and extruding a soft PVC outer layer as the tensile core using an extrusion machine; then stranding the insulated core and tensile core together using a cabling machine; and finally extruding a low-temperature resistant elastomer sheath material as the sheath. The cable possesses high mechanical strength, flexibility, high abrasion resistance, aging resistance, crack resistance, mildew resistance, moisture resistance, and acid and alkali corrosion resistance. It also exhibits flexibility at low temperatures, making it suitable for special environments such as weaponry electronics and high-end civilian applications. However, the conductors in this type of cable are made of tinned copper wires twisted together, and there is a risk of the conductors breaking during repeated bending. Utility Model Content

[0004] In view of the existing technical problems, this utility model aims to provide a drag chain cable that can solve the technical problem that the conductor is made of twisted metal wires and is prone to wire breakage in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A drag chain cable, characterized by the following structural features: it includes a longitudinally extending cable core, and a wrapping layer, an inner sheath, a braided layer, and an outer sheath sequentially covering the cable core from the inside out. The cable core is formed by stranding at least two sets of conductive units and a first tensile core. The first tensile core is located at the center of the cable core, and the conductive units are located around the first tensile core. The conductive unit is formed by stranding at least two insulated wire cores, the insulated wire core including a second tensile core, and a first insulating layer, a conductive layer, and a second insulating layer sequentially covering the second tensile core from the inside out. The conductive layer is formed by cross-braiding of metal wires.

[0007] The conductive layer can be made of bare copper wire, metal-plated copper wire, copper foil wire, or other materials, depending on the application requirements. This utility model's drag chain cable is mainly used for transmitting electrical energy and controlling switches. The DC resistance of the conductive layer should meet the requirements for conductor resistance in GB / T 3956 (Type 5). The conductive layer adopts a braided structure, which provides high flexibility while ensuring current carrying capacity. A first tensile core is set at the center of the cable core, and a second tensile core is set at the center of the insulated core. When the drag chain cable is repeatedly bent, external stress is transmitted from the outside to the inside, and the external stress is mainly concentrated on the first tensile core. When the external stress is transmitted to the insulated core, most of the stress is transferred to the second tensile core in the middle. Due to its cross-braided structure, the metal braided wires of the conductive layer can offset some of the stress, preventing damage to the metal braided wires and greatly reducing the risk of wire breakage. A first insulating layer is set outside the second tensile core, making its structure more compact and rounder. Insulating layers are set on both the inner and outer sides of the conductive layer, ensuring a consistent operating temperature and higher reliability. In addition, the conductive units are cabled by twisting insulated cores into groups. This method of grouping and cabling can disperse external stress and avoid stress concentration. The cable core is cabled in two stages in a grouped manner, which ensures that the internal insulated cores have room to move relative to each other when the drag chain cable is bent.

[0008] Preferably, the conductive layer has at least one braided layer, the diameter of the metal wire used in the conductive layer is no greater than 0.15 mm, and the braiding angle of the metal wire is no greater than 45°. The number of braided layers needs to be calculated based on the conductor cross-section, and may be one, two, or more layers.

[0009] Preferably, the cable core is cabled in the opposite direction to the conductive unit. The two opposite cabled directions counteract the internal stress on the core caused by the movement of the drag chain cable.

[0010] Preferably, the insulated wire cores are provided at least three, with adjacent insulated wire cores arranged close together, and the centers of the insulated wire cores all located on the same circle. Arranging the insulated wire cores so that their centers are on the same circle ensures that external stress is distributed across all the insulated wire cores, rather than concentrated on any one core, thus preventing stress concentration.

[0011] Preferably, the inner sheath, outer sheath, first insulation layer, and second insulation layer are all made of thermosetting rubber material. Thermosetting rubber material has high resilience and resistance to high and low temperatures (-40℃ to 90℃), enabling the drag chain cable to adapt to environments with harsh temperatures.

[0012] Specifically, both the inner and outer sheaths are extruded from neoprene rubber material, and the thickness of both the inner and outer sheaths is not less than 2.0 mm. Neoprene rubber material has good flexibility and high flame retardancy and wear resistance, which can solve the wear problem caused by drag chain cables during use.

[0013] Preferably, both the first and second insulating layers are extruded from ethylene propylene rubber material, which has a hardness of not less than 80 (IRHD) and a tensile strength of not less than 10 MPa. ethylene propylene rubber material has better mechanical strength and resilience, and can play a certain role in correcting the deformation of the conductive layer during use. At the same time, its better mechanical strength can also prevent the conductor from puncturing the insulation, thus providing higher safety performance.

[0014] Specifically, the thickness of both the first and second insulating layers is not less than 0.5 mm, and the diameter of the second tensile core after being extruded over the first insulating layer is not less than 4 mm.

[0015] Preferably, both the first and second tensile cores are made of tensile fiber material, which can withstand temperatures above 180°C. The tensile fiber can be made of cotton thread, polyester filament, aramid filament, etc. The fiber material has high tensile strength and can absorb stress, thereby ensuring the stability of the cable core structure.

[0016] Specifically, the wrapping layer is made of glass cloth tape with an overlap rate of not less than 30%; the woven layer is made of aramid yarn with a weaving density of not more than 30%.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. The drag chain cable of this utility model has a braided structure for the conductive layer, which makes the conductor highly flexible and can be repeatedly bent in the narrow space of the drag chain without breaking the wires.

[0019] 2. The drag chain cable of this utility model is made of two separate strands, which are stranded in opposite directions. This can cancel out the internal stress on the cable core caused by the movement of the drag chain. At the same time, different stranding pitches are used so that the cores can be stranded more tightly together during the second stranding, thereby improving the flexibility of the cable.

[0020] 3. The drag chain cable of this utility model is filled with high-temperature resistant and tensile-strength fiber in the middle of the cable core. Compared with the traditional concentric stranding method, it effectively avoids stress concentration on the cable core, and the fiber can absorb stress.

[0021] 4. The drag chain cable of this utility model uses high-hardness ethylene propylene rubber insulation material, which has higher mechanical strength and resilience. During use, it can play a certain role in correcting conductor deformation. At the same time, the higher mechanical strength can also prevent the conductor from puncturing the insulation, thus having higher safety performance.

[0022] 5. The drag chain cable of this utility model has a sheath material made of neoprene rubber, which has high wear resistance and can solve the wear problem caused by the cable when used in the drag chain.

[0023] 6. The drag chain cable of this utility model has a double-sheathed reinforced structure, which can effectively enhance the cable's impact resistance and drag resistance. When the cable moves slightly, the external force will first act on the outer sheath, while the braided layer between the inner and outer sheaths can act as a buffer layer to offset the mechanical external force, thereby preventing the external force from acting directly on the cable core, thus reducing the effect of the external force on the core and increasing the service life of the cable. At the same time, the braided layer between the double sheaths can also improve the impact resistance of the inner sheath and prevent the internal insulated core from protruding outward or breaking the inner sheath due to poor sliding, which is beneficial to extending the service life of the cable. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the drag chain cable structure of this utility model;

[0025] Figure 2 yes Figure 1 Schematic diagram of the conductive unit structure;

[0026] Figure 3 yes Figure 2 Schematic diagram of the transverse cross-sectional structure of the medium-insulated wire core;

[0027] Figure 4 yes Figure 2 Schematic diagram of a partial longitudinal cross-sectional structure of a medium-insulated wire core.

[0028] In the figure

[0029] 1-Cable core, 101-Conductive unit, 101-1-Insulated core; 101-1-1-Second tensile core; 101-1-2-First insulation layer; 101-1-3-Conductive layer; 101-1-4-Second insulation layer; 102-First tensile core, 2-Wrapping layer, 3-Inner sheath, 4-Braided layer, 5-Outer sheath. Detailed Implementation

[0030] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0031] like Figure 1 As shown, this embodiment provides a drag chain cable including a longitudinally extending cable core 1, and a wrapping layer 2, an inner sheath 3, a braided layer 4, and an outer sheath 5 sequentially wrapped around the cable core 1 from the inside out. The cable core 1 is formed by twisting four sets of conductive units 101 and a first tensile core 102. The first tensile core 102 is located at the center of the cable core 1, and the four sets of conductive units 101 are respectively located around the first tensile core 102. Both the inner sheath 3 and the outer sheath 5 are extruded from neoprene rubber material, and the thickness of both the inner sheath 3 and the outer sheath 5 is not less than 2.0 mm. The braided layer 4 is braided from twisted 1000D aramid yarn, with a braiding density of not more than 30%. The wrapping layer 2 is wrapped with high flame-retardant glass cloth tape, with a wrapping overlap rate of not less than 30%.

[0032] like Figure 2 As shown, the conductive unit 101 is formed by twisting two insulated wire cores 101-1 together. The two insulated wire cores 101-1 are arranged adjacent to each other, and the cabling direction of the cable core 1 is opposite to the cabling direction of the conductive unit 101. Figure 3 and Figure 4As shown, the insulated core 101-1 includes a second tensile core 101-1-1, and a first insulating layer 101-1-2, a conductive layer 101-1-3, and a second insulating layer 101-1-4, which are sequentially wrapped around the second tensile core 101-1-1 from the inside out. The conductive layer 101-1-3 is made of cross-braided metal wires. The conductive layer 101-1-3 has two braided layers and uses tin-plated copper wire with a diameter of 0.15 mm, and the braiding angle of the tin-plated copper wire is not greater than 45°. The first insulating layer 101-1-2 and the second insulating layer 101-1-4 are both extruded from hard ethylene propylene rubber material. The hardness of the ethylene propylene rubber material is not less than 80 (IRHD), and the tensile strength of the ethylene propylene rubber material is not less than 10 MPa. The thickness of both the first insulating layer 101-1-2 and the second insulating layer 101-1-4 is not less than 0.5 mm, and the diameter of the second tensile core 101-1-1 after extruding the first insulating layer 101-1-2 is not less than 4 mm. Both the first tensile core 102 and the second tensile core 101-1-1 are made of high tensile fiber material, which can withstand temperatures above 180℃. The tensile fiber can be cotton thread, polyester filament, aramid yarn, etc.

[0033] The method for preparing the drag chain cable in this embodiment involves the following steps:

[0034] Step S1, Processing of Insulated Core 101-1: Extruding a first insulation layer 101-1-2 around the second tensile core 101-1-1 serves as the central filler core of the conductive layer 101-1-3; then, tin-plated copper wire is braided around the first insulation layer 101-1-2 to form the conductive layer 101-1-3. Based on the conductor cross-section, the conductive layer 101-1-3 has two braided layers; the tin-plated copper wire is braided in a cross direction, and a second insulation layer 101-1-4 is extruded around the conductive layer 101-1-3 using an extrusion device to form the insulated core 101-1, processing eight insulated cores 101-1;

[0035] Step S2, Primary Cabling Process: Divide the eight insulated cores 101-1 into four groups of two insulated cores 101-1 each; perform primary cabling on each group of insulated cores 101-1 to form conductive units 101. Select stranding equipment with untwisting function for cabling. The cabling direction is left-hand or right-hand, and the cabling pitch ratio is less than 8. The cabling pitch ratio of each group of conductive units 101 is different. During cabling, use an electrostatic meter or similar equipment to apply talcum powder to the insulated cores 101-1 to reduce the friction between the cores and prevent the cores from moving and causing insulation damage.

[0036] Step S3, cable assembly: The four sets of conductive units 101 are cabled in a secondary manner to form cable core 1. A first tensile core 102 is set in the center of the four sets of conductive units 101. The cable assembly equipment is a stranding equipment with untwisting function. The cable assembly direction is opposite to the primary cable assembly direction in step S2. The cable section diameter ratio used is 10-12.

[0037] Step S4, processing of wrapping layer 2: wrap the cable core 1 with high flame retardant glass cloth tape, with a wrapping overlap rate of not less than 30%, to ensure that the cable has high flame retardant performance;

[0038] Step S5, Inner Sheath 3 Processing: After the cable core 1 is wrapped, it is extruded with neoprene rubber material. During extrusion, the extrusion pressure should be increased to fill the gaps in the cable with the inner sheath 2, ensuring a compact structure. At the same time, a semi-vulcanization process is used during the production of the inner sheath to keep the inner sheath 3 in a deformable state.

[0039] Step S6, processing of braided layer 4: braided layer 4 is set on inner sheath 3. The braided layer 4 is a braided reinforcement layer with fiber braided structure, which is braided with twisted 1000D aramid yarn and the braiding density is not greater than 30%.

[0040] Step S7, processing of outer sheath 5: Apply outer sheath 5 to braided layer 4. Outer sheath 5 is made of neoprene rubber material and extruded. During extrusion, increase the extrusion pressure so that outer sheath 5 passes through the mesh of braided layer 4 and adheres to inner sheath 3. Inner and outer sheaths should be completely vulcanized.

[0041] The drag chain cable provided in this embodiment differs from traditional conductors. Its conductor structure is extremely difficult to break, making it suitable for high-frequency applications. The insulation material uses high-hardness ethylene propylene rubber, capable of withstanding certain mechanical stress and possessing resilience. The conductors are arranged in groups, cabled in two stages, ensuring relative movement of the internal conductors when the cable is bent. The cores are filled with a fiber material with high axial tensile strength to ensure the stability of the cable core structure. The cable sheath is a double-sheathed reinforced structure, using flexible neoprene rubber. The double sheaths are reinforced with aramid yarn braiding to prevent the cable from being easily crushed or worn during bending operations.

[0042] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and not to limit the scope of the present invention. After reading the present invention, any modifications of the embodiments by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

Claims

1. A drag chain cable, characterized in that: The cable core (1) extends longitudinally and consists of a wrapping layer (2), an inner sheath (3), a braided layer (4), and an outer sheath (5) that are sequentially wrapped around the cable core (1) from the inside out. The cable core (1) is formed by twisting together at least two sets of conductive units (101) and a first tensile core (102). The first tensile core (102) is located at the center of the cable core (1), and the conductive units (101) are located around the first tensile core (102). The conductive unit (101) is formed by twisting together at least two insulated wire cores (101-1). The insulated wire core (101-1) includes a second tensile core (101-1-1), and a first insulating layer (101-1-2), a conductive layer (101-1-3), and a second insulating layer (101-1-4) that are sequentially wrapped around the second tensile core (101-1-1) from the inside to the outside. The conductive layer (101-1-3) is made of cross-woven metal wires.

2. The drag chain cable according to claim 1, characterized in that: The conductive layer (101-1-3) has at least one braided layer, and the diameter of the metal wire used in the conductive layer (101-1-3) is no greater than 0.15 mm, and the braiding angle of the metal wire is no greater than 45°.

3. The drag chain cable according to claim 1, characterized in that: The cable core (1) is cabled in the opposite direction to the conductive unit (101).

4. The drag chain cable according to claim 1, characterized in that: The insulated wire core (101-1) is provided with at least three wires, with two adjacent insulated wire cores (101-1) arranged close to each other, and the centers of the insulated wire cores (101-1) are all located on the same circle.

5. The drag chain cable according to claim 1, characterized in that: The inner sheath (3), outer sheath (5), first insulating layer (101-1-2), and second insulating layer (101-1-4) are all made of thermosetting rubber material.

6. The drag chain cable according to claim 5, characterized in that: Both the inner protective layer (3) and the outer protective layer (5) are made of neoprene rubber material through extrusion, and the thickness of both the inner protective layer (3) and the outer protective layer (5) is not less than 2.0 mm.

7. The drag chain cable according to claim 5, characterized in that: The first insulating layer (101-1-2) and the second insulating layer (101-1-4) are both extruded from ethylene propylene rubber material. The hardness of the ethylene propylene rubber material is not less than 80 IRHD and the tensile strength of the ethylene propylene rubber material is not less than 10 MPa.

8. The drag chain cable according to claim 7, characterized in that: The thickness of the first insulating layer (101-1-2) and the second insulating layer (101-1-4) is not less than 0.5 mm, and the diameter of the second tensile core (101-1-1) after extruding the first insulating layer (101-1-2) is not less than 4 mm.

9. The drag chain cable according to claim 1, characterized in that: The first tensile core (102) and the second tensile core (101-1-1) are both made of tensile fiber material, which is resistant to high temperatures above 180°C.

10. The drag chain cable according to claim 1, characterized in that: The wrapping layer (2) is made of glass cloth tape with an overlap rate of not less than 30%; the braided layer (4) is made of aramid yarn with a braiding density of not more than 30%.

Images