Fire-resistant rail transit platform door control cable

Abstract

The utility model relates to the technical field of cable manufacturing, in particular to a fire-resistant rail transit platform door control cable, which comprises a wire harness, a fire-resistant filling body, an outer fire-resistant wrapping tape and an outer fire-resistant sheath. The wire harness is formed by bundling conductive cables and filling strips, and is wound and wrapped by an outer fireproof wrapping tape. And an interlayer formed between the wire harness and the outer fire-resistant wrapping tape is filled with a fire-resistant filling body. And the outer fire-resistant sheath is formed at the periphery of the outer fire-resistant wrapping tape. The conductive cable is composed of a lead, an inner fire-resistant wrapping tape and an inner fire-resistant sheath which are concentrically arranged in sequence. Compared with a control cable with a traditional design structure, the fire-resistant rail transit platform door control cable has the advantages that the fire-resistant rail transit platform door control cable has multi-layer and three-dimensional fire-resistant capability, has more excellent heat resistance and flame retardance, meets the standard of General Rules of Flame-retardant and Fire-resistant Electric Wire and Cable or Optical Cable, and passes a 2-hour fire-resistant impact test specified by BS8941.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable manufacturing technical field especially a fire -resistant rail transit platform door control cable. BACKGROUND

[0002] The control cable has stable signal transmission in various environments, realizes remote communication, manipulation, control, monitoring and protection and the like functions, and is widely applied in the fields of industry, electric power, traffic, water conservancy and the like.

[0003] In the field of rail transit, the platform door is matched with the control cable, which controls the opening and closing action, and has an indispensable role in ensuring the normal operation and signal transmission reliability of the platform door. In view of the safety of rail transit operation, the control cable equipped with the platform door is a fire -resistant control cable, that is, a control cable capable of safe operation for a certain period of time under the condition of flame combustion. In terms of the current situation of the company, the fire -resistant control cable produced by the old process mainly consists of a conductor, an insulating layer and an outer sheath layer. The conductor is usually wound by multiple copper wires or alloy low resistance metal wires. The insulating layer is circumferentially wound by high temperature and non -combustion fire -resistant material, and in order to further enhance the fire -resistant type, a multi -layer winding mode is usually adopted. The outer sheath is extruded by low smoke and non -toxic plastic material. The outer sheath has excellent corrosion resistance and protection performance, but does not have high temperature resistance. The insulating layer with high temperature resistance and flame retardance plays a crucial role in achieving the fire resistance of the control cable. Therefore, the fire resistance of the old fire -resistant control cable is not good, and it is difficult to meet the 2 hour fire impact test specified in BS8941, and it is difficult to be applied to rail transit line construction. Therefore, it is urgent for technical personnel to solve the above problems. SUMMARY

[0004] Therefore, the utility model design personnel in view of the above existing problems and defects, and the collection of relevant data, through the assessment and consideration of many parties, and through the continuous experiment and modification of the technical personnel engaged in this industry for many years of research and development experience, finally lead to the emergence of the fire -resistant rail transit platform door control cable.

[0005] In order to solve the above technical problems, the utility model relates to a fire -resistant rail transit platform door control cable, which comprises a wire harness, a fire -resistant filler, an outer fire -resistant wrapping tape and an outer fire -resistant sheath. The wire harness is bundled by a plurality of conductive cables and at least one filler strip, and the whole is wrapped by the outer fire -resistant wrapping tape. The interlayer formed between the wire harness and the outer fire -resistant wrapping tape is filled with fire -resistant filler. The outer fire -resistant sheath is used for protecting and shaping the outer fire -resistant wrapping tape, and is formed on the periphery of the outer fire -resistant wrapping tape. Along the direction from inside to outside, the conductive cable is sequentially composed of a wire, an inner fire -resistant wrapping tape and an inner fire -resistant sheath arranged concentrically.

[0006] As a further improvement of the technical scheme disclosed by the utility model, the fireproof filling body is a mineral filler, polystyrene foam or organic silicon filler. The outer fireproof wrapping tape and the inner fireproof wrapping tape are calcined mica tapes with a thickness of 0.1-0.15 mm, are wrapped in a single layer and have a lap rate of not less than 50%. The outer fireproof sheath and the inner fireproof sheath are both made of low-smoke halogen-free flame-retardant radiation cross-linked polyolefin sheath material. The filling strip is extruded from flame-retardant oxygen barrier material.

[0007] As a further improvement of the technical scheme disclosed by the utility model, the wire is preferably an alloy wire or a tinned wire. Under single-stranded forming conditions, the structure is 84 / 0.30 mm, the wire bundle is 12 / 0.30 mm, right-stranded and the pitch diameter ratio is 20-25 times; and under double-stranded forming conditions, the structure is (1+6) x 12 / 0.30 mm and the pitch diameter ratio is 12-14 times.

[0008] As a further improvement of the technical scheme disclosed by the utility model, the diameter of the wire is controlled to be 3.5±0.06 mm. The outer diameter of the inner fireproof wrapping tape is controlled to be 4.0±0.1 mm. The outer diameter of the inner fireproof sheath is controlled to be 6.2±0.2 mm and the thickness thereof is controlled to be 1-1.1 mm, with the thinnest point of insulation being not less than 0.8 mm. The outer diameter of the outer fireproof wrapping tape is controlled to be 12.9±0.2 mm. The outer diameter of the outer fireproof sheath is controlled to be 15.5±0.4 mm and the thickness thereof is controlled to be 1.2-1.4 mm, with the thinnest point of insulation being not less than 0.92 mm.

[0009] As a further improvement of the technical scheme disclosed by the utility model, the filling strip is right-stranded and the pitch is controlled to be 149-170 mm.

[0010] As a further improvement of the technical scheme disclosed by the utility model, under the experimental conditions of a radiation dose of 140 Kgy, the thermal elongation rate of the fireproof rail transit platform door control cable is controlled to be 30-40%, the tensile strength is not less than 9 MPa and the breaking elongation rate is not less than 120%.

[0011] As a further improvement of the technical scheme disclosed by the utility model, the fireproof rail transit platform door control cable further comprises a temperature measuring optical fiber. The temperature measuring optical fiber is arranged in the interlayer formed by the conductive cable and the filling strip and travels along with the conductive cable.

[0012] In the technical scheme disclosed by the utility model, the outer periphery of the wire is sequentially wrapped with the inner fireproof wrapping tape and the inner fireproof sheath with fire resistance, so that the formed conductive cable has excellent fire resistance. In addition, when the conductive cable is bundled with the filling strip to form a wire bundle, the outer periphery is sequentially wrapped with the outer fireproof wrapping tape and the outer fireproof sheath with fire resistance. The filling strip has excellent fire resistance. The interlayer between the wire bundle and the outer fireproof wrapping tape is filled with the fireproof filling body with fire resistance, so that the control cable has multi-layer and three-dimensional fire resistance. Compared with the control cable with the traditional design structure, under the premise that the electrical performance test, non-electrical performance test, mechanical performance test and halogen determination of the fire-resistant rail transit platform door control cable meet the acceptance standard, the design has excellent heat resistance, flame retardance and impact resistance. Even if a fire occurs, the control cable can work normally under the premise of bearing the rated impact force, the power supply line integrity is maintained and the normal operation of the rail transit platform door is maintained, the 2-hour fire impact test specified in BS8941 is successfully passed, the afterflame or afterglow can be self-extinguished within a limited time, the combustion is limited in a local range, and the fire resistance and flame retardance test is successfully passed to meet the GB / T 19666-2019 "Flame Retardant and Fire Resistant Wire Cable or Optical Cable General" standard. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0014] Figure 1 It is the structural schematic diagram of the first kind of implementation mode of the fire-resistant rail transit platform door control cable disclosed in the utility model.

[0015] Figure 2 It is the structural schematic diagram of the conductive cable in the first kind of implementation mode of the fire-resistant rail transit platform door control cable disclosed in the utility model.

[0016] Figure 3 It is the structural schematic diagram of the second kind of implementation mode of the fire-resistant rail transit platform door control cable disclosed in the utility model.

[0017] Figure 4 It is the structural schematic diagram of the third kind of implementation mode of the fire-resistant rail transit platform door control cable disclosed in the utility model.

[0018] Figure 5It is the structural schematic view of the fourth embodiment of the fire-resistant rail transit platform door control cable disclosed in the utility model.

[0019] 1 - wire harness; 11 - conductive cable; 111 - wire; 112 - inner fire-resistant wrapping tape; 113 - inner fire-resistant sheath; 12 - filling strip; 2 - fire-resistant filling body; 3 - outer fire-resistant wrapping tape; 4 - outer fire-resistant sheath; 5 - braided shield; 6 - temperature measuring optical fiber. DETAILED DESCRIPTION

[0020] The content of the utility model will be further explained in detail below in combination with specific embodiments, Figure 1 It is shown that the structural schematic view of the first embodiment of the fire-resistant rail transit platform door control cable disclosed in the utility model, and it can be known that it is mainly composed of a wire harness 1, a fire-resistant filling body 2, an outer fire-resistant wrapping tape 3 and an outer fire-resistant sheath 4 and the like. Among them, the wire harness 1 is formed by bundling two conductive cables 11 and one filling strip 12, and the whole is wrapped by the outer fire-resistant wrapping tape 3. The interlayer (gap) formed between the wire harness 1 and the outer fire-resistant wrapping tape 3 is filled by the fire-resistant filling body 2. The outer fire-resistant sheath 4 is used for protecting and shaping the outer fire-resistant wrapping tape 3, and it is formed on the periphery of the outer fire-resistant wrapping tape 3. As shown in the figure, Figure 2 As shown in the figure, along the direction from inside to outside, the conductive cable 11 is sequentially composed of the wire 111, the inner fire-resistant wrapping tape 112 and the inner fire-resistant sheath 113 arranged concentrically.

[0021] Compared with the traditional design structure, the design concept of the fire-resistant rail transit platform door control cable disclosed in the utility model is that from inside to outside, the control cable forms a multi-level and three-dimensional fire-resistant structure. That is, the periphery of the wire 111 is sequentially wrapped with the inner fire-resistant wrapping tape 112 and the inner fire-resistant sheath 113 having fire-resistant performance, so that the formed conductive cable 11 has excellent fire-resistant performance. In addition, after the conductive cable 11 and the filling strip 12 are bundled into a wire harness, the periphery is sequentially wrapped with the outer fire-resistant wrapping tape 3 and the outer fire-resistant sheath 4 having fire-resistant performance. And the filling strip 12 has excellent fire-resistant performance. The interlayer between the wire harness 1 and the outer fire-resistant wrapping tape 3 is filled with the fire-resistant filling body 2 having fire-resistant performance.

[0022] According to different requirements of actual preparation process, the fire-resistant filling body 2 can be selected from mineral fillers, polystyrene foam or silicone fillers. The outer fire-resistant wrapping tape 3 and the inner fire-resistant wrapping tape 112 are both calcined mica tapes with a thickness of 0.1-0.15 mm, and are wrapped in a single layer with a lap rate of not less than 50%. The outer fire-resistant sheath 4 and the inner fire-resistant sheath 113 are both low-smoke halogen-free flame-retardant radiation cross-linked polyolefin sheath materials. And the filling strip 12 is extruded from flame-retardant oxygen barrier materials.

[0023] Through laboratory data demonstration, the fire-resistant rail transit platform door control cable disclosed in the embodiment has the following beneficial technical effects, specifically: the fire-resistant rail transit platform door control cable has excellent heat resistance, flame retardance and impact resistance. Even in the event of a fire, and under the premise of bearing the rated impact force, the control cable can still work normally, maintain the integrity of the power supply line and keep the rail transit platform door running normally, successfully pass the 2-hour fire-resistant impact test specified in BS8941, and the afterflame or afterglow can self-extinguish within a limited time, limiting the burning to a local range, ensuring that it can successfully pass the fire resistance and flame retardance tests to meet the GB / T 19666-2019 "General Requirements for Flame Retardant and Fire Resistant Electrical Cables or Optical Cables" standard.

[0024] Here, it should also be noted that, due to its unique design structure, the structural strength and stability of the fire-resistant rail transit platform door control cable are greatly enhanced, effectively reducing the probability of displacement, twisting and folding during installation and transportation, and reducing the risk of damage.

[0025] As a further optimization of the above technical solution, the wire 111 is preferably an alloy wire or a tinned wire with excellent conductivity and drawing performance. And according to the different needs of actual customers, the preparation process requirements are also adaptively changed, specifically: under single-stranded forming conditions, the structure is 84 / 0.30mm, the wire bundle is 12 / 0.30mm, the right twisting is twisted, and the pitch ratio is 20-25 times; and under complex-stranded forming conditions, the structure is (1+6)×12 / 0.30mm, and the pitch ratio is 12-14 times. Whether under single-stranded forming conditions or under complex-stranded forming conditions, the filling strip 12 can be right-cable, and the pitch is controlled at 149-170mm.

[0026] As known, according to industry common sense, the fire resistance and flame retardance, electrical performance and mechanical performance of the rail transit platform door control cable are not only affected by the design structure, but also by the specific design size inside. After several workshop small-batch trial production, modification and successful performance tests, the design parameters of the rail transit platform door control cable are specified: the diameter of the wire 111 is controlled at 3.5±0.06mm. The outer diameter of the inner fire-resistant wrapping tape 112 is controlled at 4.0±0.1mm. The outer diameter of the inner fire-resistant sheath 113 is controlled at 6.2±0.2mm, and its thickness is controlled at 1-1.1mm, and the thinnest point of the insulation is not less than 0.8mm. The outer diameter of the outer fire-resistant wrapping tape 3 is controlled at 12.9±0.2mm. The outer diameter of the outer fire-resistant sheath 4 is controlled at 15.5±0.4mm, and its thickness is controlled at 1.2-1.4mm, and the thinnest point of the insulation is not less than 0.92mm.

[0027] In the embodiment, the prepared fire-resistant rail transit platform door control cable not only has excellent fire resistance and flame retardance, but also meets other test requirements, specifically, under the experimental condition of a radiation dose of 140 Kgy, the thermal elongation of the fire-resistant rail transit platform door control cable is controlled to be 30-40%, the tensile strength is not less than 9 Mpa, and the elongation at break is not less than 120%.

[0028] Figure 3 The structural schematic diagram of the second embodiment of the fire-resistant rail transit platform door control cable is shown, and the difference from the first embodiment is that the total number of the filling strips 12 is 2, that is, one filling strip 12 is independently arranged on the two sides of the two conductive cables 11. In this way, the filling strip 12 is a non-hygroscopic filling material, which can effectively ensure the structural stability and the regularity of the cable during cabling. In the example, the oxygen index of the filling strip 12 is as high as more than 35, and the flame retardance of the cable is further improved.

[0029] Figure 4 The structural schematic diagram of the third embodiment of the fire-resistant rail transit platform door control cable is shown, and the difference from the second embodiment is that the braided shield 5 is formed in the interlayer between the outer fire-resistant wrapping tape 3 and the outer fire-resistant sheath 4. The braided shield 5 is generally made of red copper or tinned copper and needs to be grounded, so that external interference signals can be introduced into the ground. In this way, on the one hand, the braided shield 5 can block the interference of external electromagnetic fields and reduce or eliminate the interference on the internal signals of the fire-resistant rail transit platform door control cable. Especially in a high-frequency or high-voltage environment, the braided shield 5 plays a role in suppressing external interference signals and improving signal transmission quality. The braided shield 5 can effectively reduce the electromagnetic radiation generated during signal transmission, reduce the interference on the surrounding environment and other equipment, and significantly improve the electromagnetic compatibility of the fire-resistant rail transit platform door control cable.

[0030] Figure 5 The structural schematic diagram of the fourth embodiment of the fire-resistant rail transit platform door control cable is shown, and the difference from the third embodiment is that the temperature measuring optical fiber 6 is additionally arranged in the fire-resistant rail transit platform door control cable. The temperature measuring optical fiber 6 travels with the conductive cable 11 and is arranged in the interlayer (gap) formed by the conductive cable 11 and the filling strip 12. In actual application, the temperature measuring optical fiber 6 can measure the temperature distribution of all points along the fire-resistant rail transit platform door control cable by using the principle that the spectrum of some substances changes with temperature. When the temperature of one or more test points exceeds the design threshold, the power supply receives a control signal to immediately reduce the power supply current of the fire-resistant rail transit platform door control cable, and in serious cases, the power supply process can even be interrupted.

[0031] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fire-resistant control cable for rail transit platform screen doors, characterized in that, The device includes a wire harness, a fire-resistant filler, an outer fire-resistant wrapping tape, and an outer fire-resistant sheath. The wire harness is composed of multiple conductive cables and at least one filler strip bundled together, and is entirely wrapped and wrapped by the outer fire-resistant wrapping tape. The interlayer formed between the wire harness and the outer fire-resistant wrapping tape is filled by the fire-resistant filler. The outer fire-resistant sheath is used to protect and shape the outer fire-resistant wrapping tape, and is formed on the periphery of the outer fire-resistant wrapping tape. Along the inner to outer direction, the conductive cables are sequentially composed of concentrically arranged conductors, an inner fire-resistant wrapping tape, and an inner fire-resistant sheath.

2. The fire-resistant rail transit platform door control cable according to claim 1, characterized in that... The refractory filler is a mineral filler, polystyrene foam, or organosilicon filler; the outer refractory wrapping tape and the inner refractory wrapping tape are both calcined mica tapes with a thickness of 0.1-0.15 mm, single-layer wrapping, and the overlap rate is not less than 50%; the outer refractory sheath and the inner refractory sheath are both made of low-smoke halogen-free flame-retardant irradiated cross-linked polyolefin sheath material; the filler strip is extruded from flame-retardant oxygen-barrier material.

3. The fire-resistant rail transit platform door control cable according to claim 1, characterized in that... The conductor is an alloy conductor or a tin-plated conductor; under single-twisted forming conditions, the structure is 84 / 0.30mm, the bundle of wires is 12 / 0.30mm, right-hand twisted, and the pitch ratio is 20 to 25 times; while under double-twisted forming conditions, the structure is (1+6)×12 / 0.30mm, and the pitch ratio is 12 to 14 times.

4. The fire-resistant rail transit platform door control cable according to claim 1, characterized in that... The diameter of the conductor is controlled at 3.5±0.06mm; the outer diameter of the inner fire-resistant wrapping tape is controlled at 4.0±0.1mm; the outer diameter of the inner fire-resistant sheath is controlled at 6.2±0.2mm, and its thickness is controlled at 1~1.1mm, with the thinnest insulation point thickness not less than 0.8mm; the outer diameter of the outer fire-resistant wrapping tape is controlled at 12.9±0.2mm; the outer diameter of the outer fire-resistant sheath is controlled at 15.5±0.4mm, and its thickness is controlled at 1.2~1.4mm, with the thinnest insulation point thickness not less than 0.92mm.

5. The fire-resistant rail transit platform screen door control cable according to any one of claims 1-4, characterized in that... The filler strip is cabled to the right, and the pitch is controlled between 149 and 170 mm.

6. The fire-resistant rail transit platform screen door control cable according to any one of claims 1-4, characterized in that... Under experimental conditions with an irradiation dose of 140 kJ, the thermal elongation of the fire-resistant rail transit platform door control cable is controlled at 30-40%, the tensile strength is not less than 9 MPa, and the elongation at break is not less than 120%.

7. The fire-resistant rail transit platform screen door control cable according to any one of claims 1-4, characterized in that... It also includes a temperature-sensing optical fiber; the temperature-sensing optical fiber runs alongside the conductive cable and is arranged in the interlayer formed by the conductive cable and the filler strip.

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