Flame-retardant electromagnetic compatibility tensile servo cable and preparation method thereof

Abstract

The invention relates to the technical field of servo cable manufacturing, and discloses a flame-retardant electromagnetic compatibility tensile servo cable and a preparation method thereof. The conductor of the cable provided by the invention is formed by twisting a plurality of small-diameter tinned copper wire conductors in the same direction, and the conductor has excellent bending performance and can adapt to servo system actions in various scenes without core breakage; the reinforcing layer adopts the aramid yarn braid layer, so that the cable has higher tensile property, and as the polyether polyurethane outer sheath is extruded in an extrusion mode, aramid yarns and the polyether polyurethane outer sheath can be tightly attached, so that the tensile property of the sheath of the cable is improved; and the polyether polyurethane is used as the outer sheath, so that the cable has excellent wear resistance, tensile strength, oil resistance and hydrolysis resistance, and can be applied to most industrial environments. The cable provided by the invention has good flame retardant property, and can meet the flame retardant property requirement under industrial scene application.

Description

Technical Field

[0001] The present invention relates to the technical field of servo cable manufacturing, and in particular to a flame-retardant, electromagnetic compatibility, tensile-resistant servo cable and a preparation method thereof. Background Art

[0002] Servo cables are specialized cables used in servo motor systems, primarily connecting servo controllers and servo motors to transmit power, control signals, and feedback signals. Servo systems are widely used in industrial automation, robotics, CNC machine tools, and other fields, requiring extremely high-precision control. Servo cables offer high reliability and stable operation in complex working environments, ensuring proper system operation. They also exhibit excellent anti-interference capabilities, effectively preventing external electromagnetic interference from affecting signal transmission and ensuring accurate transmission of control commands.

[0003] At present, servo cables on the market generally use cross-linked polyethylene, polyvinyl chloride, TPE, etc. as cable insulation and sheath materials, and have the following structural characteristics: (1) The cable does not have flame retardant properties. If an open flame is generated in the operating environment, the flame can easily spread from the servo cable to other parts, which may cause significant property losses. (2) When the servo system is running, the sheath of the servo cable will be dragged, moved and bent, and the sheath is prone to cracks or even cracks, which will cause the internal core of the cable to be exposed or water to enter. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of flame retardancy, wear resistance, tensile strength and electromagnetic interference resistance of servo cables in most scenarios, and to improve the digital and intelligent upgrade of the system through optical fiber connection of the servo system.

[0005] To achieve the above objectives, a first aspect of the present invention provides a flame-retardant electromagnetic compatibility tensile servo cable, the cable comprising: an optical fiber 1, an optical fiber protective sleeve 2, a signal core 3, an optical fiber signal unit wrapped shielding layer 4, an optical fiber signal unit braided shielding layer 5, an optical fiber signal unit tape layer 6, a power line core 7, a grounding line core 8, a control line core 9, a control unit tape layer 10, a control unit braided shielding layer 11, a total tape layer 12, a reinforcement layer 13, an outer sheath 14, and a filler strip 101; The signal core 3 includes a signal core conductor 31, a signal core inner insulation layer 32, and a signal core outer insulation layer 33 arranged in sequence from the inside to the outside; The power line core 7 includes a power line core conductor 71, a power line core inner insulation layer 72, and a power line core outer insulation layer 73 arranged in sequence from the inside to the outside; The grounding core 8 includes a grounding core conductor 81, a grounding core inner insulation layer 82, and a grounding core outer insulation layer 83 arranged in sequence from the inside to the outside; The control core 9 includes a control core conductor 91 , a control core inner insulation layer 92 , and a control core outer insulation layer 93 , which are sequentially arranged from the inside to the outside.

[0006] Preferably, the optical fiber 1 is a single-tube glass optical fiber bundle, the end face of which can withstand a temperature of ≤250° C. and the core diameter is 2 mm.

[0007] Further preferably, the optical fiber protection sleeve 2 is composed of a combination of a 304 stainless steel corrugated tube, a PVDF heat-melt tube, and a PVDF heat-shrink tube.

[0008] Preferably, the signal core conductor 31 is composed of 16 to 23 tinned copper wires with a diameter of 0.20 mm twisted in the same direction.

[0009] Preferably, the insulating layer 32 inside the signal wire core is composed of overlapping and wrapped polytetrafluoroethylene films.

[0010] More preferably, the signal wire core outer insulation layer 33 is formed by extrusion of flame-retardant polypropylene insulation material.

[0011] Preferably, the optical fiber signal unit wrapped shielding layer 4 is composed of aluminum foil Mylar tape.

[0012] Preferably, the optical fiber signal unit braided shielding layer 5 is braided from tinned copper wires with a diameter of 0.12-0.15 mm.

[0013] Further preferably, the optical fiber signal unit wrapping layer 6 is formed by overlapping and wrapping polytetrafluoroethylene films.

[0014] Preferably, the power line core conductor 71 is composed of 52 to 77 tinned copper wires with a diameter of 0.30 mm twisted in the same direction.

[0015] Further preferably, the insulation layer 72 inside the power line core is composed of overlapping and wrapped polytetrafluoroethylene films.

[0016] Preferably, the outer insulation layer 73 of the power line core is formed by extrusion of flame-retardant polypropylene insulation material.

[0017] Preferably, the grounding core conductor 81 is composed of 28 to 46 tinned copper wires with a diameter of 0.25 mm twisted in the same direction.

[0018] More preferably, the inner insulation layer 82 of the ground wire core is composed of overlapping and wrapped polytetrafluoroethylene films.

[0019] Preferably, the outer insulation layer 83 of the ground wire core is formed by extrusion of flame-retardant polypropylene insulation material.

[0020] Further preferably, the control core conductor 91 is composed of 28 to 46 tinned copper wires with a diameter of 0.25 mm twisted in the same direction.

[0021] Preferably, the inner insulation layer 92 of the control core is composed of overlapping and wrapped polytetrafluoroethylene films.

[0022] Preferably, the outer insulation layer 93 of the control wire core is formed by extrusion of flame-retardant polypropylene insulation material.

[0023] Further preferably, the control unit wrapping layer 10 is formed by overlapping and wrapping aluminum foil Mylar tapes with a thickness of 0.05 mm.

[0024] Preferably, the control unit braided shielding layer 11 is braided from tinned copper wires with a diameter of 0.12-0.15 mm.

[0025] Further preferably, the total wrapping tape layer 12 is formed by overlapping and wrapping polyester non-woven fabric tapes.

[0026] Preferably, the reinforcement layer 13 is woven from aramid yarns.

[0027] More preferably, the outer sheath 14 is formed by extrusion of a polyether polyurethane material.

[0028] Preferably, the filling strip 101 is a flame-retardant PP filling rope.

[0029] A second aspect of the present invention provides a method for preparing a flame-retardant electromagnetic compatibility tensile servo cable, comprising the following steps: Step S1, stringing a single-tube glass optical fiber bundle into an optical fiber protection sleeve 2 to obtain an optical fiber unit; Sixteen tinned copper wires with a diameter of 0.20 mm were bundled and twisted to obtain a signal core conductor 31. A polytetrafluoroethylene film was wrapped around the outer layer of the signal core conductor 31 to form a signal core inner insulation layer 32. A molten flame-retardant polypropylene insulation material was then extruded and wrapped around the outer layer of the signal core inner insulation layer 32 to form a signal core outer insulation layer 33, thereby obtaining a signal core 3. Three more signal cores 3 were then prepared using the same method and parameters. The optical fiber unit and the four signal cores 3 are twisted into a cable, and a filling strip 101 is added during the twisting process to obtain an intermediate I; Step S2: overlappingly wrapping aluminum foil Mylar tape around the outer layer of the intermediate body I to form a fiber optic signal unit wrapped shielding layer 4, and weaving a tinned round copper wire with a diameter of 0.12-0.15 mm around the outer layer of the aluminum foil Mylar tape to form a fiber optic signal unit braided shielding layer 5, and then wrapping a layer of polytetrafluoroethylene film around the outer layer of the fiber optic signal unit braided shielding layer 5 to form a fiber optic signal unit tape layer 6, thereby obtaining a fiber optic signal unit having a structure from inside to outside of the intermediate body I-fiber optic signal unit wrapped shielding layer-fiber optic signal unit braided shielding layer-fiber optic signal unit tape layer; Step S3: 56 tinned copper wires with a diameter of 0.30 mm are bundled and twisted to obtain a power line core conductor 71, and a polytetrafluoroethylene film is wrapped around the outer layer of the power line core conductor 71 to form a power line core inner insulation layer 72. A flame-retardant polypropylene insulation material is then melted and extruded onto the outer layer of the power line core inner insulation layer 72 to form a power line core outer insulation layer 73, thereby obtaining a power line core 7 having a structure of power line core conductor-power line core inner insulation layer-power line core outer insulation layer from the inside to the outside. Three of the power line cores 7 are then prepared using the same method and parameters. Step S4: 49 0.25 mm tinned copper wires are bundled and twisted to obtain a grounding core conductor 81, and a polytetrafluoroethylene film is wrapped around the outer layer of the grounding core conductor 81 to form a grounding core inner insulation layer 82. A flame-retardant polypropylene insulation material is melted and extruded onto the outer layer of the grounding core inner insulation layer 82 to form a grounding core outer insulation layer 83, thereby obtaining a grounding core 8 having a structure of a grounding core conductor-a grounding core inner insulation layer-a grounding core outer insulation layer from the inside to the outside. Step S5: 30 tinned copper wires with a diameter of 0.25 mm are bundled and twisted once to obtain a control core conductor 91, and a polytetrafluoroethylene film is wrapped around the outer layer of the control core conductor 91 to form a control core inner insulation layer 92. A flame-retardant polypropylene insulation material is then melted and extruded onto the outer layer of the control core inner insulation layer 92 to form a control core outer insulation layer 93, thereby obtaining a control core 9 having a structure of control core conductor-control core inner insulation layer-control core outer insulation layer from the inside to the outside. Then, one control core 9 is prepared according to the same method and parameters. Step S6: twisting the two control cores 9 into a cable, placing a filler strip 101 during the twisting process for filling, to obtain a control unit cable core, then wrapping an aluminum foil Mylar tape around the outer layer of the control unit cable core to form a control unit tape layer 10, then weaving a 0.12-0.15 mm tinned copper wire around the outer layer of the aluminum foil Mylar tape to form a control unit braided shielding layer 11, to obtain a control unit; and then preparing one of the control units according to the same method and parameters; Step S7: placing the optical fiber signal unit, two control units, four power line cores 7, and one ground line core 8 in a cabling machine for cable twisting, and inserting a filler bar 101 during the cable twisting process to obtain a cable core; The polyester non-woven fabric tape is overlapped and wrapped around the outer layer of the cable core to form the total wrapping tape layer 12, and the aramid yarn with a specification of 300D is woven into the outer layer of the polyester non-woven fabric to form the reinforcement layer 13. Then, the polyether polyurethane material with a hardness of 85A is melted and extruded, and the polyurethane material or flame-retardant PVC material is tightly wrapped on the reinforcement layer 13 to form the outer sheath 14.

[0030] Preferably, in step S1, the width of the polytetrafluoroethylene film is 0.04 mm, and the overlapping rate of the polytetrafluoroethylene film is ≥15%.

[0031] Preferably, in step S1, the nominal thickness of the flame retardant polypropylene after extrusion and melting is 0.5 mm.

[0032] Further preferably, in step S2, the overlapping wrapping rate of the aluminum foil Mylar tape is ≥15%.

[0033] Preferably, in step S2, the braiding density of the tinned round copper wire is ≥85%.

[0034] Further preferably, in step S2, the width of the polytetrafluoroethylene film is 0.04 mm, and the overlapping wrapping rate of the polytetrafluoroethylene film is ≥15%.

[0035] Preferably, in step S3, step S4 and step S5, the width of the polytetrafluoroethylene film is 0.04 mm, and the overlapping wrapping rate of the polytetrafluoroethylene film is ≥15%.

[0036] Further preferably, in step S3 and step S4, the nominal thickness of the extruded flame-retardant polypropylene is 0.6 mm.

[0037] Preferably, in step S5, the nominal thickness of the extruded flame retardant polypropylene is 0.5 mm.

[0038] More preferably, in step S6, the width of the aluminum foil Mylar tape is 0.05 mm, and the overlapping wrapping rate of the aluminum foil Mylar tape is ≥15%.

[0039] Preferably, in step S6, the braiding density of the tinned round copper wire is ≥85%.

[0040] Preferably, in step S7, the thickness of the polyester non-woven fabric tape is 0.20 mm, and the overlapping wrapping rate of the polyester non-woven fabric tape is ≥15%.

[0041] Further preferably, in step S7, the braiding density of the aramid yarn is ≥20%.

[0042] Preferably, in step S7 , the outer sheath 14 has a nominal thickness of 1.4 mm.

[0043] The cable provided by the present invention has at least the following beneficial effects: (1) Traditional servo cables have poor flame retardancy. The cable provided by the present invention has good flame retardancy and can meet the flame retardancy requirements in industrial applications. (2) During the operation of the servo system, the sheath of a conventional servo cable will drag, move, and bend, and the sheath is prone to cracking or even splitting. The conductor of the cable provided by the present invention is composed of multiple small-diameter tinned copper wires twisted in the same direction. The conductor has excellent bending properties and can adapt to the servo system operation in various scenarios without breaking the core. The use of flame-retardant polypropylene insulation makes the insulation layer have better wear resistance, thereby reducing the wear of the wire core during movement; (3) Optical fiber has become a key technology for upgrading industrial servo systems to high speed and intelligence due to its anti-interference, high bandwidth and environmental resistance. Optical fiber supports gigabit and even 10G data transmission rates, meeting the needs of modern servo systems for high-resolution encoder signals, multi-axis synchronous control and real-time communication (such as EtherCAT and Sercos III); (4) In the present invention, the aramid yarn braided layer used in the reinforcement layer gives the cable higher tensile strength. Since the polyether polyurethane outer sheath is extruded, the aramid yarn and the polyether outer sheath can be tightly fitted, greatly improving the tensile strength of the cable sheath. In addition, the polyether polyurethane outer sheath has excellent wear resistance, tensile strength, oil resistance, and hydrolysis resistance, meeting the application requirements of most industrial environments. It is not prone to cracking and damage like traditional cables, greatly improving the reliability of cable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 1 is a cross-sectional structural diagram of the flame-retardant electromagnetic compatibility tensile servo cable of the present invention; Figure 2 This is a cross-sectional structural diagram of an optical fiber signal unit in a flame-retardant, electromagnetic compatibility, tensile-resistant servo cable according to the present invention; Figure 3 It is a cross-sectional structural diagram of the control unit in the flame-retardant electromagnetic compatibility tensile servo cable of the present invention.

[0045] Description of Reference Numerals 1. Optical fiber, 2. Optical fiber protection sleeve, 3. Signal core, 4. Optical fiber signal unit wrapped shielding layer, 5. Optical fiber signal unit braided shielding layer, 6. Optical fiber signal unit tape layer, 7. Power line core, 8. Grounding line core, 9. Control wire core, 10. Control unit tape layer, 11. Control unit braided shield layer; 12. Overall tape layer; 13. Reinforcement layer, 14. Outer sheath, 101. Filler strip, 31. Signal core conductor, 32. Insulation layer inside the signal line core, 33. Insulation layer outside the signal line core, 71. Power line core conductor, 72. Power line core inner insulation layer, 73. Power line core outer insulation layer; 81. Grounding line core conductor, 82. Grounding line core inner insulation layer, 83. Grounding line core outer insulation layer, 91. Control line core conductor, 92. Control line core inner insulation layer, 93. Control line core outer insulation layer. DETAILED DESCRIPTION

[0046] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0047] The present invention will be described in detail below through examples. In the following examples, unless otherwise specified, the raw materials are all commercially available.

[0048] In the following examples, unless otherwise specified, optical fiber 1 is a single-tube glass optical fiber bundle, the end face of which can withstand a temperature of ≤250°C and the core diameter is 2 mm; The optical fiber protection sleeve 2 is composed of a 304 stainless steel corrugated tube, a PVDF heat-melt tube, and a PVDF heat-shrink tube; The filling strip 101 is a flame retardant PP filling rope.

[0049] Example 1 A flame retardant electromagnetic compatibility tensile servo cable (structure as Figure 1 shown), the cable includes: Optical fiber 1, optical fiber protection sleeve 2, signal core 3, optical fiber signal unit wrapped shield layer 4, optical fiber signal unit braided shield layer 5, optical fiber signal unit tape layer 6, power line core 7, grounding line core 8, control line core 9, control unit tape layer 10, control unit braided shield layer 11, total tape layer 12, reinforcement layer 13, outer sheath 14, filling strip 101; The signal core 3 includes a signal core conductor 31, a signal core inner insulation layer 32, and a signal core outer insulation layer 33 arranged in sequence from the inside to the outside; The power line core 7 includes a power line core conductor 71, a power line core inner insulation layer 72, and a power line core outer insulation layer 73 arranged in sequence from the inside to the outside; The grounding core 8 includes a grounding core conductor 81, a grounding core inner insulation layer 82, and a grounding core outer insulation layer 83 arranged in sequence from the inside to the outside; The control core 9 includes a control core conductor 91 , a control core inner insulation layer 92 , and a control core outer insulation layer 93 , which are sequentially arranged from the inside to the outside.

[0050] A method for preparing an industrial flame-retardant electromagnetic compatibility tensile servo cable, the method comprising the following steps: Step S1, stringing a single-tube glass optical fiber bundle into an optical fiber protection sleeve 2 by stringing tubes to obtain an optical fiber unit; Sixteen tinned copper wires with a diameter of 0.20 mm were bundled and twisted once using a stranding machine to obtain a signal core conductor 31. A polytetrafluoroethylene film with a width of 0.04 mm was wrapped around the outer layer of the signal core conductor 31 using a wrapping machine (with an overlap ratio of ≥15%) to form a signal core inner insulation layer 32. A molten flame-retardant polypropylene insulation material was then extruded (with a nominal thickness of 0.5 mm) around the outer layer of the signal core inner insulation layer 32 using an extruder and an extrusion die to form a signal core outer insulation layer 33, thereby obtaining a signal core 3. Three more signal cores 3 were then prepared using the same method and parameters. according to Figure 2 As shown in the layout, the above optical fiber unit and the four signal cores 3 are twisted into a cable, and filling strips 101 are added during the twisting process to obtain an intermediate I.

[0051] Step S2: Overlapping an aluminum foil Mylar tape with a thickness of 0.05 mm (overlapping coverage ratio ≥ 15%) on the outer layer of the intermediate body I to form a fiber optic signal unit wrapped shielding layer 4, and using a 16-spindle high-speed braiding machine to braid tinned round copper wire with a diameter of 0.12-0.15 mm (braiding density ≥ 85%) on the outer layer of the aluminum foil Mylar tape to form a fiber optic signal unit braided shielding layer 5. Then, using a wrapping machine, wrap a layer of polytetrafluoroethylene film with a thickness of 0.04 mm (overlapping coverage ratio ≥ 15%) on the outer layer of the fiber optic signal unit braided shielding layer 5 to form a fiber optic signal unit tape layer 6, thereby obtaining a fiber optic signal unit having a structure from inside to outside of intermediate body I-fiber optic signal unit wrapped shielding layer-fiber optic signal unit braided shielding layer-fiber optic signal unit tape layer.

[0052] Step S3: 56 tinned copper wires with a diameter of 0.30 mm are bundled and twisted once using a stranding machine to obtain a power line core conductor 71. A polytetrafluoroethylene film with a bandwidth of 0.04 mm is wrapped around the outer layer of the power line core conductor 71 using a wrapping machine (with an overlap rate of ≥15%) to form a power line core inner insulation layer 72. A flame-retardant polypropylene insulation material is then melted using an extruder and then extruded using an extrusion die (with a nominal thickness of 0.6 mm) to form an outer layer of the power line core inner insulation layer 72 to form a power line core outer insulation layer 73. This results in a power line core 7 having a structure from the inside out of a power line core conductor - a power line core inner insulation layer - a power line core outer insulation layer. Three of the power line cores 7 are then prepared using the same method and parameters.

[0053] Step S4: Use a bundle twister to bundle and twist 49 0.25 mm tinned copper wires to obtain a grounding wire core conductor 81, and use a wrapping machine to wrap a polytetrafluoroethylene film with a bandwidth of 0.04 mm (with an overlapping wrapping coverage rate of ≥15%) on the outer layer of the grounding wire core conductor 81 to form an inner insulation layer 82 of the grounding wire core. Then, use an extruder to melt the flame-retardant polypropylene insulation material and extrude it with an extrusion die (the nominal thickness of the extrusion is 0.6 mm) on the outer layer of the inner insulation layer 82 of the grounding wire core to form an outer insulation layer 83 of the grounding wire core, thereby obtaining a grounding wire core 8 with a structure of grounding wire core conductor-grounding wire core inner insulation layer-grounding wire core outer insulation layer from the inside to the outside.

[0054] Step S5: Use a bundle twister to bundle and twist 30 tinned copper wires with a diameter of 0.25 mm to obtain a control core conductor 91, and use a wrapping machine to wrap a polytetrafluoroethylene film with a bandwidth of 0.04 mm (with an overlapping wrapping coverage rate of ≥15%) on the outer layer of the control core conductor 91 to form a control core inner insulation layer 92. Then, use an extruder to melt the flame-retardant polypropylene insulation material, and then use an extrusion die to extrude it (the nominal thickness of the extrusion is 0.5 mm) on the outer layer of the control core inner insulation layer 92 to form a control core outer insulation layer 93, thereby obtaining a control core 9 with a structure of control core conductor-control core inner insulation layer-control core outer insulation layer from the inside to the outside; and then prepare one of the control cores 9 according to the same method and parameters.

[0055] Step S6: Use a cabling machine to cable and twist the two control wire cores 9, place a filling strip 101 for filling during the twisting process to obtain a control unit cable core, and then overlap and wrap an aluminum foil Mylar tape with a thickness of 0.05 mm (overlapping wrapping coverage rate ≥ 15%) on the outer layer of the control unit cable core to form a control unit wrapping layer 10, and then use a 16-spindle high-speed braiding machine to weave 0.12~0.15 mm tinned copper wire (weaving density ≥ 85%) on the outer layer of the aluminum foil Mylar tape to form a control unit braided shielding layer 11 to obtain a control unit; and then prepare one of the control units according to the same method and parameters.

[0056] Step S7, press Figure 1 The structure shown is as follows: the optical fiber signal unit, two control units, four power line cores 7, and one ground line core 8 are placed in a cabling machine for cable twisting, and a filling strip 101 is placed during the cable twisting process to obtain a cable core; A layer of polyester non-woven fabric with a thickness of 0.20 mm is overlapped and wrapped (overlap rate ≥ 15%) on the outer layer of the cable core to form a total wrapping tape layer 12, and a 16-spindle braiding machine is used to braid aramid yarn with a specification of 300D (braiding density ≥ 20%) on the outer layer of the polyester non-woven fabric to form a reinforcement layer 13. Then, an extruder is used to melt the flame-retardant polyether polyurethane with a hardness of 85A, and then it is extruded with an extrusion die (the extrusion temperature is controlled at 190℃±10℃). The polyether polyurethane material with a hardness of 85A is tightly wrapped on the reinforcement layer 13 to form an outer sheath 14 (the nominal thickness of the outer sheath is 1.4 mm) and passed into a cooling water tank. The temperature of the cooling water tank should be set low enough. If necessary, a refrigeration device can be used to cool the water in the water tank or ice cubes can be placed in the water. Anti-adhesion agent is added to the water to prevent adhesion between the sheaths during the cable winding process.

[0057] Example 2 This example is carried out according to the method of Example 1, except that in step S7, flame-retardant PVC material is used in place of the polyurethane material in the outer sheath 14, and the remaining steps and parameters are the same as those of Example 1.

[0058] Comparative Example 1 This example is carried out according to the method of Example 1, except that the optical fiber signal unit wrapping layer 6 and the control unit wrapping layer 10 are both made of 0.04 mm polyester wrapping tape. The remaining steps and parameters are the same as those of Example 1.

[0059] Comparative Example 2 This example is carried out according to the method of Example 1, except that in step S7, the reinforcement layer 13 is not formed, that is, the outer sheath 14 is directly formed on the overall wrapping tape layer 12. The remaining steps and parameters are the same as those of Example 1.

[0060] Comparative Example 3 This example is carried out according to the method of Example 1, except that the materials constituting the signal line core outer insulation layer 33, the power line core outer insulation layer 73, the ground line core outer insulation layer 83, and the control line core outer insulation layer 93 are all flame-retardant PVC insulation materials. The remaining steps and parameters are the same as those of Example 1.

[0061] Test Case The flame-retardant electromagnetic compatibility tensile servo cables obtained in the above examples and comparative examples were subjected to performance tests, and the results are shown in Table 1. Among them, flame retardancy is measured according to UL 2556, which is the U.S. wire and cable safety standard, namely the wire and cable test method standard, which was updated and released in 2021;

[0062] As can be seen from Table 1, the flame-retardant electromagnetic compatibility tensile servo cable obtained in the embodiment of the present invention has higher insulation resistance, longer service life, and better torsion resistance. The flame retardant performance can also meet the more stringent VW-1 combustion grade appraisal in UL 2556. VW-1 is a vertical burning flame retardant test for wires and cables in the UL 2556 standard, which is used to evaluate the flame retardant performance of wires and cables. FT1 is a horizontal and vertical burning flame retardant test for wires and cables in the UL 2556 standard, which is used to evaluate the flame retardant performance of wires and cables.

[0063] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A flame-retardant electromagnetic compatibility tensile servo cable, characterized in that: The cable comprises: an optical fiber (1), an optical fiber protective sleeve (2), a signal wire core (3), an optical fiber signal unit wrapped shielding layer (4), an optical fiber signal unit braided shielding layer (5), an optical fiber signal unit tape layer (6), a power wire core (7), a ground wire core (8), a control wire core (9), a control unit tape layer (10), a control unit braided shielding layer (11), a total tape layer (12), a reinforcement layer (13), an outer sheath (14), and a filling strip (101); The signal core (3) comprises a signal core conductor (31), a signal core inner insulation layer (32), and a signal core outer insulation layer (33) which are arranged in sequence from the inside to the outside; The power line core (7) comprises a power line core conductor (71), a power line core inner insulation layer (72), and a power line core outer insulation layer (73) which are arranged in sequence from the inside to the outside; The grounding core (8) comprises a grounding core conductor (81), a grounding core inner insulation layer (82), and a grounding core outer insulation layer (83) which are arranged in sequence from the inside to the outside; The control core (9) comprises a control core conductor (91), a control core inner insulation layer (92), and a control core outer insulation layer (93) which are arranged in sequence from the inside to the outside.

2. The flame-retardant electromagnetic compatibility tensile servo cable according to claim 1, characterized in that: The optical fiber (1) is a single-tube glass optical fiber bundle, the end face of which can withstand a temperature of ≤250°C and the core diameter of which is 2mm; And / or, the optical fiber protection sleeve (2) is composed of a combination of a 304 stainless steel corrugated tube, a PVDF heat-melt tube, and a PVDF heat-shrink tube.

3. The flame-retardant electromagnetic compatibility tensile servo cable according to claim 1, characterized in that: The signal line core conductor (31) is composed of 16 to 23 tinned copper wires with a diameter of 0.20 mm, which are twisted in the same direction; And / or, the insulating layer (32) inside the signal wire core is composed of overlapping and wrapped polytetrafluoroethylene films; And / or, the outer insulation layer (33) of the signal wire core is formed by extrusion of flame-retardant polypropylene insulation material.

4. The flame-retardant electromagnetic compatibility tensile servo cable according to claim 1, characterized in that: The optical fiber signal unit wrapped shielding layer (4) is composed of aluminum foil Mylar tape; And / or, the optical fiber signal unit braided shielding layer (5) is braided from tinned copper wires with a diameter of 0.12-0.15 mm; And / or, the optical fiber signal unit wrapping layer (6) is formed by overlapping and wrapping polytetrafluoroethylene films; And / or, the power line core conductor (71) is composed of 52 to 77 tinned copper wires with a diameter of 0.30 mm twisted in the same direction; And / or, the insulation layer (72) inside the power line core is composed of overlapping and wrapped polytetrafluoroethylene films; And / or, the outer insulation layer (73) of the power line core is formed by extrusion of flame-retardant polypropylene insulation material.

5. The flame-retardant electromagnetic compatibility tensile servo cable according to claim 1, characterized in that: The grounding core conductor (81) is composed of 28 to 46 tinned copper wires with a diameter of 0.25 mm, which are twisted in the same direction; And / or, the insulation layer (82) inside the grounding wire core is composed of overlapping polytetrafluoroethylene films; And / or, the outer insulation layer (83) of the ground wire core is formed by extrusion of flame-retardant polypropylene insulation material; And / or, the control core conductor (91) is composed of 28 to 46 tinned copper wires with a diameter of 0.25 mm twisted in the same direction; And / or, the control wire core inner insulation layer (92) is composed of overlapping polytetrafluoroethylene films; And / or, the outer insulation layer (93) of the control wire core is formed by extrusion of flame-retardant polypropylene insulation material.

6. The flame-retardant electromagnetic compatibility tensile servo cable according to claim 1, characterized in that: The control unit wrapping layer (10) is formed by overlapping and wrapping aluminum foil Mylar tapes with a thickness of 0.05 mm; And / or, the control unit braided shielding layer (11) is braided from tinned copper wires having a diameter of 0.12-0.15 mm; And / or, the total wrapping tape layer (12) is formed by overlapping and wrapping polyester non-woven fabric tapes; And / or, the reinforcement layer (13) is woven from aramid yarns; And / or, the outer sheath (14) is formed by extrusion of a polyether polyurethane material; And / or, the filling strip (101) is a flame-retardant PP filling rope.

7. A method for preparing the flame-retardant electromagnetic compatibility tensile servo cable according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1: stringing a single-tube glass optical fiber bundle into an optical fiber protection sleeve (2) to obtain an optical fiber unit; 16 tinned copper wires with a diameter of 0.20 mm are bundled and twisted to obtain a signal wire core conductor (31), and a polytetrafluoroethylene film is wrapped around the outer layer of the signal wire core conductor (31) to form a signal wire core inner insulation layer (32), and then a molten flame-retardant polypropylene insulation material is extruded around the outer layer of the signal wire core inner insulation layer (32) to form a signal wire core outer insulation layer (33), thereby obtaining a signal wire core (3); and three signal wire cores (3) are then prepared using the same method and parameters; The optical fiber unit and the four signal cores (3) are subjected to a cable twisting process, and a filling strip (101) is added during the twisting process to obtain an intermediate I; Step S2: overlappingly wrapping aluminum foil Mylar tape around the outer layer of the intermediate body I to form a fiber optic signal unit wrapped shielding layer (4), and weaving tinned round copper wire with a diameter of 0.12-0.15 mm on the outer layer of the aluminum foil Mylar tape to form a fiber optic signal unit braided shielding layer (5), and then wrapping a layer of polytetrafluoroethylene film around the outer layer of the fiber optic signal unit braided shielding layer (5) to form a fiber optic signal unit wrapping layer (6), thereby obtaining a fiber optic signal unit having a structure from inside to outside of intermediate body I-fiber optic signal unit wrapped shielding layer-fiber optic signal unit braided shielding layer-fiber optic signal unit wrapping layer; Step S3: 56 tinned copper wires with a diameter of 0.30 mm are bundled and twisted once to obtain a power line core conductor (71), and a polytetrafluoroethylene film is wrapped around the outer layer of the power line core conductor (71) to form a power line core inner insulation layer (72), and then a flame retardant polypropylene insulation material is melted and extruded onto the outer layer of the power line core inner insulation layer (72) to form a power line core outer insulation layer (73), thereby obtaining a power line core (7) having a structure of power line core conductor-power line core inner insulation layer-power line core outer insulation layer from the inside to the outside; and then three power line cores (7) are prepared according to the same method and parameters; Step S4: 49 0.25 mm tinned copper wires are bundled and twisted once to obtain a grounding wire core conductor (81), and a polytetrafluoroethylene film is wrapped around the outer layer of the grounding wire core conductor (81) to form a grounding wire core inner insulation layer (82), and then a flame-retardant polypropylene insulation material is melted and extruded onto the outer layer of the grounding wire core inner insulation layer (82) to form a grounding wire core outer insulation layer (83), thereby obtaining a grounding wire core (8) having a structure from inside to outside of a grounding wire core conductor-grounding wire core inner insulation layer-grounding wire core outer insulation layer; Step S5: 30 tinned copper wires with a diameter of 0.25 mm are bundled and twisted once to obtain a control core conductor (91), and a polytetrafluoroethylene film is wrapped around the outer layer of the control core conductor (91) to form a control core inner insulation layer (92), and then a flame-retardant polypropylene insulation material is melted and extruded onto the outer layer of the control core inner insulation layer (92) to form a control core outer insulation layer (93), thereby obtaining a control core (9) having a structure of control core conductor-control core inner insulation layer-control core outer insulation layer from the inside to the outside; and then, one control core (9) is prepared according to the same method and parameters; Step S6: twisting two control wire cores (9) into a cable, placing a filling strip (101) during the twisting process for filling, to obtain a control unit cable core, then wrapping an aluminum foil Mylar tape on the outer layer of the control unit cable core to form a control unit wrapping layer (10), then weaving a 0.12-0.15 mm tinned copper wire on the outer layer of the aluminum foil Mylar tape to form a control unit braided shielding layer (11), to obtain a control unit; and then preparing one of the control units according to the same method and parameters; Step S7: placing the optical fiber signal unit, two control units, four power line cores (7), and one ground line core (8) in a cabling machine, performing a cabling twisting process, and inserting a filler strip (101) during the cabling twisting process to obtain a cable core; The polyester non-woven fabric tape is overlapped and wrapped around the outer layer of the cable core to form a total wrapping tape layer (12), and aramid yarn with a specification of 300D is woven into the outer layer of the polyester non-woven fabric to form a reinforcement layer (13). Then, a polyether polyurethane material with a hardness of 85A is melted and extruded, and the polyurethane material or flame-retardant PVC material is tightly wrapped on the reinforcement layer (13) to form an outer sheath (14).

8. The method according to claim 7, characterized in that In step S1, the width of the polytetrafluoroethylene film is 0.04 mm, and the overlapping rate of the polytetrafluoroethylene film is ≥15%; and / or, in step S1, the nominal thickness of the flame retardant polypropylene after extrusion and melting is 0.5 mm; And / or, in step S2, the overlapping wrapping rate of the aluminum foil Mylar tape is ≥15%; and / or, in step S2, the braiding density of the tinned round copper wire is ≥85%; And / or, in step S2, the width of the polytetrafluoroethylene film is 0.04 mm, and the overlapping rate of the polytetrafluoroethylene film is ≥15%.

9. The method according to claim 7, characterized in that In step S3, step S4, and step S5, the width of the polytetrafluoroethylene film is 0.04 mm, and the overlapping rate of the polytetrafluoroethylene film is ≥15%; and / or, in step S3 and step S4, the nominal thickness of the extruded flame-retardant polypropylene is 0.6 mm; And / or, in step S5, the nominal thickness of the extruded flame retardant polypropylene is 0.5 mm.

10. The method according to claim 7, characterized in that In step S6, the width of the aluminum foil Mylar tape is 0.05 mm, and the overlapping wrapping rate of the aluminum foil Mylar tape is ≥15%; and / or, in step S6, the braiding density of the tinned round copper wire is ≥85%; And / or, in step S7, the thickness of the polyester non-woven fabric tape is 0.20 mm, and the overlapping wrapping rate of the polyester non-woven fabric tape is ≥15%; and / or, in step S7, the braiding density of the aramid yarn is ≥20%; And / or, in step S7, the outer sheath (14) has a nominal thickness of 1.4 mm.

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