Bending-resistant high-flexibility PVC (polyvinyl chloride) insulation and TPU (thermoplastic polyurethane) sheath shielding type control cable

Abstract

The utility model relates to a bending-resistant high-flexibility PVC (polyvinyl chloride) insulation and TPU (thermoplastic polyurethane) sheath shielding type control cable, which structurally comprises a plurality of insulation wire cores which are twisted into a cable and then sequentially wrapped with an inner protective layer, an inner shielding layer, an outer shielding layer and an outer protective layer from inside to outside, each insulating wire core sequentially comprises a conductive core, an inner insulation layer and an outer insulation layer from inside to outside. A release agent lubricating coating is arranged outside the outer insulation layer; the conductive core is a sixth type of circular tinned copper conductor; the inner insulation layer is made of a soft PVC insulation material, and the outer insulation layer is made of a low-temperature-resistant high-hardness PVC insulation material; a release agent is coated outside the insulated wire core to form a release agent lubricating coating; after the insulating wire cores are twisted into a cable, the surface of the cable core is uniformly coated with talcum powder to form a talcum powder lubricating coating; the inner protection layer is made of a soft PVC (Polyvinyl Chloride) material; the inner shielding layer and the outer shielding layer form a composite shielding layer; the inner shielding layer is formed by overlapping and wrapping polyester copper-plastic composite belts, and the outer shielding layer is formed by weaving tinned copper wires; and the outer protection layer is made of a TPU (thermoplastic polyurethane) elastomer sheath material.

Description

Technical Field

[0001] The present application relates to the technical field of control cables for numerical control industrial equipment, and in particular to a bending-resistant and highly flexible polyvinyl chloride (PVC) insulated polyurethane elastomer (TPU) sheathed shielded control cable. Background Art

[0002] With the development of industrial digital intelligence in the country and the application of intelligence and digitalization in the field of manufacturing, the demand for CNC industrial equipment has shown a rapid growth trend in the past two years, especially in the fields of automobile assembly, photovoltaics, lithium batteries, etc. Cables, as a key medium for power and signal transmission, play an increasingly important role in the development of intelligent digital production and manufacturing, and the demand is also increasing. In 2023, China's demand for industrial robots and servo robot cables exceeded 10 billion yuan, and the demand for cables in this field will increase further in the future.

[0003] As an important component of CNC industrial equipment, control cables play an extremely important role in the power supply and signal transmission of the equipment.

[0004] Since traditional control cables are mostly used for fixed laying and are relatively rigid, they cannot meet the small bending radius and long-term reciprocating drag chain motion environment of CNC industrial equipment. At the same time, CNC industrial equipment has high requirements for the accuracy of signal transmission and the reduction of distortion and mutual influence during signal transmission. Therefore, shielded control cables with good signal shielding effect and the ability to withstand small bending radius and long-term reciprocating drag chain motion have always been a difficult problem for users to solve.

[0005] A bending-resistant, highly flexible PVC insulated polyurethane elastomer sheathed shielded control cable developed this time is an important supporting component for CNC industrial equipment. In addition to meeting the performance requirements of conventional control cables, the cable also has the characteristics of high flexibility, resistance to bending and reciprocating motion, resistance to torsion, resistance to -40°C low temperature, and oil resistance. The cable meets the use requirements in different environments.

[0006] Defects and shortcomings of the existing technology:

[0007] Control cables used on mobile CNC industrial equipment are used in a long-term environment of dragging, winding and shrinking reciprocating bending motions. At the same time, due to the particularity of the equipment used, the cables are required to have good signal shielding effects. Therefore, such control cables are required to have good mechanical properties and flexibility, and to be able to meet the conditions of long-term bending and winding without cracking. In addition, the cables will inevitably come into contact with oil during use, so the cables are required to have certain oil resistance properties. There are also discussions on similar cables in the prior art, such as:

[0008] Chinese patent CN217214184U proposes "Insulated shielded control cable for industrial control (202220857471)", which includes: two conductors 1, each of which includes a plurality of twisted oxygen-free copper cores and a first insulating layer extruded outside the oxygen-free copper core; two conductors 2, each of which includes a plurality of twisted oxygen-free copper cores and a second insulating layer extruded outside the oxygen-free copper core; a filler bar, arranged between the conductors 1 and 2. It uses bare wires of different wire diameters of conductors, and provides better flexibility and deformation by using bare wires with smaller diameters. Two conductors with larger bare wire diameters are used as the base point when the cable is bent, and two conductors with thinner bare wire diameters provide deformation when bent. In this way, the cable can be bent repeatedly, and the overall flexibility of the cable is improved. The main defect of this cable is that although the wire diameters of the conductors are the same, the wire diameters of the monofilament bare wires are different, resulting in different transmission efficiencies of different conductors, especially for conductors that transmit signals, which easily causes signal instability.

[0009] Chinese patent CN207441278U proposes "an EPDM insulated control cable (2017208250061)", which includes a main core and a number of small cores centered on the main core and twisted together with the main core to form a cable core. Both the main core and the small core include a conductor and an EPDM insulation layer extruded on the outside of the conductor. An inner isolation layer is extruded on the outside of the cable core, and the vacant part formed between the inner isolation layer and the cable core is filled with a low-smoke, halogen-free, oxygen-isolating material. An isolation lubricating layer is provided on the outside of the inner isolation layer, and a copper wire braided shielding layer and a sheath are provided on the outside of the isolation lubricating layer in sequence from the inside to the outside. The cable is filled with grease on the outside of the cable core and a special oil sealing plug is designed, which greatly increases the difficulty of producing the cable, and there is a risk of the oil sealing plug falling off after the cable is bent multiple times. Summary of the invention

[0010] The utility model proposes a bending-resistant and highly flexible PVC insulated and TPU sheathed shielded control cable, which can meet the requirements of long-term drag chain reciprocating bending in numerical control industrial equipment. The cable has good mechanical properties and flexibility, and the cable does not crack after 5 million times of reciprocating bending. The control cable has good shielding effect, and the cable can withstand use in a low temperature environment of -40°C. The cable has good oil resistance and meets the requirements of use under oily conditions.

[0011] The utility model is designed to solve the problem that the control cable for CNC industrial equipment meets the requirements of long-term drag chain reciprocating bending in CNC industrial equipment. The cable is required to have good mechanical properties and flexibility. The cable will not crack after 5 million times of reciprocating bending. The control cable has good shielding effect. At the same time, the cable can withstand use in a low temperature environment of -40°C. The cable has good oil resistance and meets the requirements of use under oily conditions.

[0012] The cable of the utility model comprises a conductive core, a double-layer co-extruded composite insulating layer, a lubricating coating, an inner protective layer, a composite shielding layer and an outer protective layer.

[0013] The conductive core adopts the sixth type of round tinned copper conductor (bending resistance) specified in GB / T 3956, and the nominal cross-sectional area of ​​the conductor is 1.0mm 2 Up to 95mm 2 . The conductor adopts a one-time bundling structure and a multi-strand re-twisted structure. The pitch diameter ratio of the conductor of the one-time bundling structure is not more than 15 times; for the re-twisted structure conductor, the pitch diameter ratio of the strand is not more than 18 times, the pitch diameter ratio of the inner layer of the re-twisted is not more than 15 times, and the pitch diameter ratio of the outer layer of the re-twisted is not more than 12 times. The twisting direction of the outermost layer of the conductor is left-handed, and the twisting directions of adjacent layers are opposite. The bundling direction of the strands is the same as the twisting direction of the layer. Among them, a layer of thin non-woven fabric with a nominal thickness of 0.1mm is used for overlapping wrapping on the outside of conductors of 35mm2 and above, and the wrapping overlap rate is not less than 15%. After twisting, the conductor has a round, tight, smooth appearance, uniform pitch, and no defects such as missing roots, skipped edges, burrs, scratches, and oil stains. The process is stable during the production process. The cage twisting machine is used for concentric twisting when the conductor is re-twisted. Back-twisting is required during the twisting process to avoid twisting stress. The conductor meets the standard requirements.

[0014] The composite insulation layer adopts double-layer co-extrusion process / structure, the inner insulation adopts composite soft PVC insulation material with good electrical properties, and the outer insulation adopts composite PVC insulation material with good mechanical properties. The inner and outer insulation adopts double-layer co-extrusion process, and is extruded by two extruders at the same time. The extrusion production process is adopted. The nominal thickness of the inner insulation is controlled to be 0.5mm, and the nominal thickness of the outer insulation is controlled to be 0.6mm. The thickness of the thinnest insulation is not less than 90%-0.1mm of the nominal value, and the eccentricity is not more than 30%. The insulation should be tightly extruded on the conductor, should be easy to peel off without damaging the conductor, and the insulation surface should be flat, smooth, and free of defects such as blisters, bubbles, cracks, and scratches.

[0015] Two lubricating coatings are used, namely, a release agent lubricating coating outside the insulating core and a talcum powder lubricating coating outside the cable core.

[0016] The release agent lubricating coating is to coat the extruded insulated wire core with a release agent through a release agent coating device to reduce the friction resistance of the wire core and increase the lubrication effect of the wire core surface.

[0017] The talcum powder lubricating coating is a layer of 1250 mesh asbestos-free talcum powder evenly coated on the surface of the cable core after the wire cores are twisted into cables and before the inner sheath is extruded to lubricate the cable core.

[0018] To ensure the flexibility of the cable, a cage stranding machine is used during the manufacturing of the core cables. The stranding direction of the outermost layer of the cable core is left-handed, and the stranding directions of the cores of adjacent layers are opposite. The cable section diameter ratio is not greater than 8 times.

[0019] The inner sheath is a composite soft PVC material extruded on the surface of the cable core. The inner sheath material has good mechanical properties, ensuring that the cable core can be well protected during repeated bending and use. The inner sheath is produced by extrusion production process. The thickness of the inner sheath ranges from 1.0mm to 1.5mm, the average thickness is not less than the nominal value, and the thinnest thickness is not less than 85% of the nominal value - 0.1mm;

[0020] The composite shielding layer is made of polyester copper-plastic composite tape with overlapping wrapping and tinned copper wire braided shielding. A layer of 0.15mm thick polyester copper-plastic composite tape is overlapped and wrapped outside the inner sheath, and the overlapping coverage rate of the copper-plastic composite tape is not less than 20%. The polyester side of the polyester copper-plastic composite tape faces inward and the copper tape faces outward. After wrapping, the surface of the cable core is smooth and flat.

[0021] The braided protective layer shall be a tinned copper wire braided shield with a nominal diameter of 0.12mm. The braiding density shall not be less than 80%. The braided layer shall be uniform and consistent without defects such as oil stains, burrs, and missing strands.

[0022] The outer sheath is made of black polyurethane elastomer TPU sheath material, with a nominal thickness of 2.0mm, an average thickness not less than the nominal value, and a thickness of not less than 90% of the nominal thickness - 0.1mm at the thinnest point. The outer sheath should be round in appearance, with a smooth surface, and no defects such as pores, impurities, and mechanical damage on the cross section.

[0023] The release agent can be a release agent suitable for PVC materials. For example, the model produced by Dongguan Chenhui Lubricating Oil Co., Ltd. is CH-102

[0024] The PVC insulation material constituting the inner insulation is a soft PVC insulation material, which requires that the material hardness is 73 Shore A hardness, meets the -40℃ low temperature performance test, meets the -30℃ low temperature embrittlement test, and the volume resistivity of the material at 20℃ is ≥6×10 13 Ω·cm. For example, the brand produced by Hangzhou Meilin New Material Technology Co., Ltd. is ULJ-80W40 Rohs2.0 environmentally friendly UL80℃ cold-resistant polyvinyl chloride insulation material.

[0025] The requirements for the PVC insulation material that constitutes the outer insulation are that the material hardness is 78±2 Shore A hardness, meets the -40℃ low temperature performance test, meets the -30℃ low temperature embrittlement test, and under the 250mm / min tensile speed test conditions, the material mechanical properties are tensile strength 17.5Mpa, elongation at break ≥290%, and under the aging test conditions of 113℃×168h, the material mechanical property change rate does not exceed 15%. For example, the brand produced by Jiangsu Ruiwen New Material Technology Co., Ltd. is RWJ-80(-40) cold-resistant polyvinyl chloride insulation material;

[0026] The soft PVC material is required to have a hardness of 80±2 Shore A hardness, meet the -40℃ low temperature performance test, meet the -30℃ low temperature embrittlement test, and under the 250mm / min tensile speed test conditions, the material mechanical properties are tensile strength 16.5Mpa, elongation at break ≥260%, and under the 113℃×168h aging test conditions, the material mechanical property change rate does not exceed 20%, which can ensure that the cable can play a good role in protecting the cable core during repeated bending and use. For example, the brand produced by Jiangsu Ruiwen New Material Technology Co., Ltd. is RWZH-80(-40) environmentally friendly 80℃ cold-resistant flame-retardant sheath material.

[0027] The performance requirements of the black polyurethane elastomer TPU sheath material include: material hardness of 78±2 Shore A hardness, tear strength of 20N / mm; resistance to low temperature of -40℃; oil resistance, and the ability to meet the requirements of being immersed in 902# mineral oil at 90℃ for 24 hours, with the sheath mechanical property change rate not exceeding 30%, so that the cable can maintain normal use under oily conditions. For example, the grade 1185A10 material produced by BASF AG.

[0028] Technical principle and effect description of the utility model:

[0029] In terms of conductor structure design, the utility model control cable adopts the 6th type flex-resistant tinned copper conductor structure in view of the reciprocating bending and torsion characteristics in the use environment of the control cable for numerical control industrial equipment. Compared with the 5th type conductor, the conductor structure has the characteristics of thinner single wire diameter, more strands and softer conductor. At the same time, in the conductor twisting process, the conductor twisting pitch ratio is further optimized to achieve the purpose of cable flexibility and realize the minimum bending radius of the cable to meet 4 to 5 times the cable diameter. In terms of the fatigue life of the cable reciprocating bending, the utility model control cable is subjected to a cable reciprocating bending U-type test at 8 times the cable bending radius and a moving speed of 30 times / minute. The cable can meet the reciprocating bending times of more than 5 million times. There is no visible cracking on the cable surface, and the cable conductor has no broken wires or strands. The cable core meets the performance requirements of continuous power supply. The innovation of conductor structure design improves the flexibility of cable structure and provides protection for long-term reciprocating bending and winding operation of cables. At the same time, the conductor adopts tin-plated structure, which can effectively improve the corrosion resistance of conductor and reduce the chemical reaction between copper conductor and air, oil, acid and alkali corrosive gas, so that the cable can withstand more harsh use environment and extend the service life of the cable.

[0030] In terms of the selection of insulating materials, the utility model control cable adopts an inner and outer double-layer insulation structure. The inner insulation adopts flexible PVC insulating material with good electrical properties to ensure the electrical performance of the cable during use. The outer insulation adopts composite PVC material with good mechanical properties. The outer insulation material has a high hardness. Through the outer insulation, the conductive core and the inner insulation can be well protected during the repeated bending and twisting movement of the cable. At the same time, the inner and outer insulation have good low-temperature resistance and can still have good electrical and mechanical properties under -40°C conditions, meeting the normal use requirements of the cable.

[0031] Compared with traditional control cables, the utility model control cable has a lubricating coating structure in the structural design. The release agent and 1250 mesh asbestos-free talcum powder are applied on the surface of the wire core and the cable core to increase the lubrication of the cable core, so that the cable core can eliminate resistance and release its own stress in time through self-lubrication in the use environment of repeated twisting, bending and extension of the cable, avoiding damage to the cable core caused by stress concentration, thereby affecting the service life of the cable. Compared with traditional control cables, the control cable with a lubricating coating is softer and has a longer service life for reciprocating bending.

[0032] In terms of the inner sheath, the utility model control cable uses composite soft PVC material to extrude a sheath on the surface of the cable core. The inner sheath material has good mechanical properties, ensuring that the cable can provide good protection for the cable core during repeated bending and use. The inner sheath is produced using an extrusion production process.

[0033] In terms of shielding structure, the utility model control cable adopts a double-layer composite shielding structure. The inner layer is shielded by overlapping polyester copper-plastic composite tape, and the overlapping rate of the wrapping is not less than 20%. The copper surface faces the outside to ensure that the shielding layer on the surface of the cable core is 100% evenly covered. The outer shielding is shielded by tinned copper wire weaving, and the copper wire weaving density is not less than 80%. The use of braided shielding can effectively ensure that the cable has a good protection and support shielding effect on the copper tape shielding layer of the cable core in terms of longitudinal stretching and repeated back and forth bending, further improving the shielding efficiency of the cable and meeting the use requirements of the cable in numerical control industrial equipment.

[0034] In terms of the outer sheath, the utility model control cable adopts black polyurethane elastomer sheath material with a material hardness of 78±2 Shore A hardness and a tear strength of 20N / mm, which makes the cable have good flexibility and can meet the use conditions of repeated bending and twisting of the cable. The sheath material has good low temperature resistance, and the cable can still operate normally under -40℃ ambient temperature conditions. In addition, the material has good oil resistance and can meet the requirements of being immersed in 902# mineral oil and immersed at 90℃ for 24 hours. The change rate of the mechanical properties of the sheath does not exceed 30%, so that the cable can maintain normal use under oily conditions.

[0035] Compared with traditional control cables, the control cable of the utility model can meet the requirements of long-term drag chain reciprocating bending in CNC industrial equipment through the selection of materials and the design innovation of corresponding structures. The cable has good mechanical properties and flexibility. The cable will not crack after 5 million times of reciprocating bending. The control cable of the utility model has good shielding effect. At the same time, the cable can withstand use in a low temperature environment of -40°C. The cable has good oil resistance and meets the requirements of use under oily conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the cross section of the cable of this application.

[0037] Attached Figure 1 Marking instructions: 1. Conductive core; 2. Inner insulation; 3. Outer insulation; 4. Talc lubricating coating; 5. Inner protective layer; 6. Inner shielding; 7. Outer shielding; 8. Outer protective layer. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1 The present application is further described in detail with specific embodiments.

[0039] refer to Figure 1 , a bending-resistant and highly flexible PVC insulated and TPU sheathed shielded control cable, the structure of which includes: a plurality of insulated cores are twisted into a cable, and then wrapped with an inner sheath 5, an inner shield 6, an outer shield 7 and an outer sheath 8 in sequence from the inside to the outside;

[0040] The insulating wire core comprises a conductive core 1, an inner insulating layer 2 and an outer insulating layer 3 from the inside to the outside; a release agent lubricating coating is coated on the outer surface of the outer insulating layer 3;

[0041] The conductive core 1 is a sixth type of round tinned copper conductor specified in GB / T 3956; the inner insulation 2 is made of a soft PVC insulation material, and the outer insulation 3 is made of a low temperature resistant and high hardness PVC insulation material; a release agent is coated on the outside of the insulating wire core (outer insulation 3) to form a release agent lubricating coating;

[0042] After the insulated wire cores are twisted into a cable, talcum powder is evenly coated on the surface of the cable core to form a talcum powder lubricating coating 4;

[0043] The inner protective layer 5 is made of soft PVC material;

[0044] The inner shield 6 and the outer shield 7 form a composite shielding layer; the inner shield 6 is formed by overlapping and wrapping polyester copper-plastic composite tapes, and the outer shield 7 is formed by braiding tinned copper wires;

[0045] The outer protective layer 8 is made of polyurethane elastomer TPU sheath material.

[0046] In this example:

[0047] The nominal cross-sectional area of ​​the conductor used in the conductive core 1 is in the range of 1.0mm 2 Up to 95mm 2 ;

[0048] The conductor is a one-time bundled structure or a multi-stranded twisted structure (the monofilaments constituting the conductor are first bundled into strands at one time, and then the strands are twisted). In the one-time bundled structure, the conductor's pitch-diameter ratio is not greater than 15 times; in the twisted structure, the strand pitch-diameter ratio is not greater than 18 times, the inner layer of the twisted structure is not greater than 15 times, and the outer layer of the twisted structure is not greater than 12 times. The twisting direction of the outermost layer is left-handed, the twisting directions of adjacent layers are opposite, and the strand bundling direction is the same as the twisting direction of the layer;

[0049] The cross-sectional area of ​​the conductor used in the conductive core is 35mm2 and above, and the conductor is wrapped with a layer of thin non-woven fabric with a nominal thickness of 0.1mm, and the wrapping overlap rate is not less than 15%.

[0050] The nominal thickness of the inner insulation 2 is 0.5 mm, and the nominal thickness of the outer insulation 3 is 0.6 mm. The thickness at their thinnest point is not less than 90%-0.1 mm of the nominal value, and the eccentricity is not greater than 30%.

[0051] The insulated cores are twisted in multiple layers, the twisting directions of adjacent layers of the insulated cores are opposite, and the twisting direction of the outermost layer of the insulated cores is left-handed; the cable twisting pitch diameter ratio is not greater than 8 times.

[0052] The nominal thickness range of the inner protective layer 5 is 1.0 mm to 1.5 mm, the average thickness is not less than the nominal value, and the thickness at the thinnest point is not less than 85%-0.1 mm of the nominal value.

[0053] The thickness of the polyester copper-plastic composite tape is 0.15mm, the overlapping rate of the copper-plastic composite tape is not less than 20%, the polyester side of the polyester copper-plastic composite tape faces inward and the copper tape side faces outward; the nominal diameter of the tinned copper wire of the outer shield is 0.12mm, and the weaving density is not less than 80%.

[0054] The nominal thickness of the outer protective layer 8 is 2.0 mm, the average thickness is not less than the nominal value, and the thickness at the thinnest point is not less than 90% - 0.1 mm of the nominal thickness.

[0055] The talc powder is 1250 mesh asbestos-free talc powder.

[0056] The materials used in this cable are purchased from the market, and the requirements are as follows:

[0057] The release agent can be a release agent suitable for PVC materials, and the model CH-102 produced by Dongguan Chenhui Lubricating Oil Co., Ltd. is optional.

[0058] The PVC insulation material constituting the inner insulation is a soft PVC insulation material with a hardness of 73 Shore A hardness, which meets the -40℃ low temperature performance test and the -30℃ low temperature embrittlement test. The volume resistivity of the material at 20℃ is ≥6×10 13 Ω·cm, the brand ULJ-80W40 Rohs2.0 environmentally friendly UL80℃ cold-resistant polyvinyl chloride insulation material produced by Hangzhou Meilin New Material Technology Co., Ltd. can be selected.

[0059] The PVC insulation material constituting the outer insulation has a material hardness of 78±2 Shore A hardness, meets the -40℃ low temperature performance test, meets the -30℃ low temperature embrittlement test, and under the test conditions of 250mm / min tensile speed, the material mechanical properties are tensile strength 17.5Mpa, elongation at break ≥290%, and under the aging test conditions of 113℃×168h, the material mechanical property change rate does not exceed 15%. The optional brand produced by Jiangsu Ruiwen New Material Technology Co., Ltd. is RWJ-80(-40) cold-resistant polyvinyl chloride insulation material.

[0060] The soft PVC material has a hardness of 80±2 Shore A hardness, meets the -40℃ low temperature performance test and the -30℃ low temperature embrittlement test. Under the tensile speed test conditions of 250mm / min, the material mechanical properties are tensile strength 16.5Mpa, elongation at break ≥260%, and under the aging test conditions of 113℃×168h, the material mechanical property change rate does not exceed 20%, which can ensure that the cable core can be well protected during repeated bending and use. The optional brand produced by Jiangsu Ruiwen New Material Technology Co., Ltd. is RWZH-80(-40) environmentally friendly 80℃ cold-resistant flame-retardant sheath material.

[0061] Black polyurethane elastomer TPU sheath material, performance requirements include: material hardness of 78±2 Shore A hardness, tear strength of 20N / mm; resistance to -40℃ low temperature; oil resistance, able to meet the requirements of immersion in 902# mineral oil, immersion at 90℃ for 24 hours, the sheath mechanical property change rate does not exceed 30%, so that the cable can maintain normal use under oily conditions. BASF AG's brand 1185A10 material can be used.

[0062] The utility model discloses a bending-resistant and highly flexible polyvinyl chloride insulated polyurethane elastomer sheathed shielded control cable. Compared with traditional control cables, the cable can meet the requirements of long-term drag chain reciprocating bending in numerical control industrial equipment through innovation in structure and materials. The cable has good mechanical properties and flexibility. The cable will not crack after 5 million times of reciprocating bending. The control cable of the utility model has good shielding effect. At the same time, the cable can withstand use in a low temperature environment of -40°C. The cable has good oil resistance and meets the requirements of use under oily conditions.

[0063] The above utility model is designed and used for a bending-resistant and highly flexible polyvinyl chloride insulated polyurethane elastomer sheathed shielded control cable. Through the innovation of structure and materials, the cable can meet the long-term drag chain reciprocating bending use in CNC industrial equipment. The cable has good mechanical properties and flexibility. The cable will not crack after 5 million times of reciprocating bending. The utility model control cable has good shielding effect. At the same time, the cable can withstand use in a low temperature environment of -40°C. The cable has good oil resistance and meets the requirements for use under oily conditions.

Claims

1. A bending-resistant, highly flexible PVC insulated and TPU sheathed shielded control cable, characterized in that the structure include: After multiple insulated wire cores are twisted into a cable, they are then wrapped with an inner sheath, inner shield, outer shield and outer sheath from the inside out; The insulating wire core comprises a conductive core, an inner insulating layer and an outer insulating layer from the inside to the outside; a release agent lubricating coating is coated on the outer insulating layer; The conductive core is the sixth type of round tinned copper conductor specified in GB / T 3956; the inner insulation is made of soft PVC insulation material, and the outer insulation is made of low temperature resistant and high hardness PVC insulation material; a release agent is coated on the outside of the insulating core to form a release agent lubricating coating; After the insulated wire cores are twisted into cables, talcum powder is evenly coated on the surface of the cable core to form a talcum powder lubricating coating; The inner protective layer is made of soft PVC material; The inner shield and the outer shield form a composite shield; the inner shield is formed by overlapping and wrapping polyester copper-plastic composite tapes, and the outer shield is formed by braiding tinned copper wires; The outer protective layer is made of polyurethane elastomer TPU sheath material.

2. The bending-resistant and highly flexible PVC insulated and TPU sheathed shielded control cable according to claim 1 is characterized in that The nominal cross-sectional area of ​​the conductor used in the conductive core is in the range of 1.0 mm 2 Up to 95mm 2 ; The conductor is a one-time bundled structure and a multi-strand twisted structure; in the one-time bundled structure, the conductor's pitch diameter ratio is not greater than 15 times; in the twisted structure, the strand pitch diameter ratio is not greater than 18 times, the inner layer of the twisted structure is not greater than 15 times, and the outer layer of the twisted structure is not greater than 12 times. The twisting direction of the outermost layer is left-handed, the twisting directions of adjacent layers are opposite, and the strand bundling direction is the same as the twisting direction of the layer.

3. The bending-resistant and highly flexible PVC insulated and TPU sheathed shielded control cable according to claim 1 is characterized in that The cross-sectional area of ​​the conductor used in the conductive core is 35mm2 and above, and the conductor is wrapped with a layer of thin non-woven fabric with a nominal thickness of 0.1mm, and the wrapping overlap rate is not less than 15%.

4. The bending-resistant and highly flexible PVC insulated and TPU sheathed shielded control cable according to claim 1 is characterized in that The nominal thickness of the inner insulation is 0.5mm, and the nominal thickness of the outer insulation is 0.6mm. The thickness at their thinnest point is not less than 90%-0.1mm of the nominal value, and the eccentricity is not greater than 30%.

5. The bending-resistant and highly flexible PVC insulated and TPU sheathed shielded control cable according to claim 1 is characterized in that The insulated cores are twisted in multiple layers, the twisting directions of adjacent layers of the insulated cores are opposite, and the twisting direction of the outermost layer of the insulated cores is left-handed; the cable twisting pitch diameter ratio is not greater than 8 times.

6. The bending-resistant and highly flexible PVC insulated and TPU sheathed shielded control cable according to claim 1 is characterized in that The nominal thickness range of the inner protective layer is 1.0mm to 1.5mm, the average thickness is not less than the nominal value, and the thickness at the thinnest point is not less than 85%-0.1mm of the nominal value.

7. The bending-resistant and highly flexible PVC insulated and TPU sheathed shielded control cable according to claim 1 is characterized in that The thickness of the polyester copper-plastic composite tape is 0.15mm, the overlapping rate of the copper-plastic composite tape is not less than 20%, the polyester side of the polyester copper-plastic composite tape faces inward and the copper tape side faces outward; the nominal diameter of the tinned copper wire of the outer shield is 0.12mm, and the weaving density is not less than 80%.

8. The bending-resistant and highly flexible PVC insulated and TPU sheathed shielded control cable according to claim 1 is characterized in that The nominal thickness of the outer sheath is 2.0mm, the average thickness is not less than the nominal value, and the thickness at the thinnest point is not less than 90% of the nominal thickness - 0.1mm.

9. The bending-resistant and highly flexible PVC insulated and TPU sheathed shielded control cable according to claim 1 is characterized in that The talc powder is 1250 mesh asbestos-free talc powder.

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