Processing and construction method of photoelectric composite cable synchronously laid in pipeline

Abstract

The invention discloses a processing and construction method for a photoelectric composite cable synchronously laid in a pipeline, and provides the photoelectric composite cable with a small wall thickness and a small overall size, so that an optical cable and an electric cable can simultaneously penetrate through a 6-13mm thin pipeline in the market at one time, the pipeline consumption and laying time are saved, and the cost is reduced. And the use occasion of the pipeline is widened, and the utilization rate of the pipeline is improved. The photoelectric composite cable can be laid in a pipeline, so that the photoelectric composite cable does not need to be suspended in a self-supporting manner, the design of the photoelectric composite cable is simplified, the thinner optical cable part is connected with the thicker cable part, necessary tensile performance can be provided for the optical cable through the cable, and therefore, the photoelectric composite cable is convenient to use. The corresponding design for achieving the tensile performance of the optical cable part can be simplified, and therefore it is ensured that the photoelectric composite cable can still meet the requirement for the tensile performance under the condition that the size is small.

Description

Technical Field

[0001] The present application relates to the field of optoelectronic composite cables, and in particular to a processing and construction method for optoelectronic composite cables synchronously laid in pipelines. Background Art

[0002] During construction, pipes are usually reserved in the building for the convenience of future wiring. Thin pipes with an inner diameter of 6mm-13mm occupy the highest proportion in the actual market. When the wiring construction is actually carried out, network cables or optical cables will be laid in the pipes according to actual needs.

[0003] In the prior art, since the size of such pipes is relatively small, and the size of the optoelectronic composite cables that meet the performance requirements on the market is much larger than the inner diameter of the pipe, the common practice in actual wiring is to pass a network cable or an optical cable through a pipe alone. Therefore, in order to complete the wiring in the building, a pipe needs to be configured for each network cable and optical cable, which results in low pipe utilization, repeated installation and construction, and waste of manpower and material resources. Summary of the invention

[0004] The embodiment of the present application provides a processing and construction method for an optoelectronic composite cable for synchronous laying in a pipeline, which is used to solve the technical problem that the existing optoelectronic composite cable cannot be adapted to achieve synchronous laying in thin pipelines of 6mm-13mm on the market.

[0005] In a first aspect of the present application, a method for processing an optoelectronic composite cable for synchronous laying in a pipeline is provided, the method comprising the following steps:

[0006] The first sheath tube and the second sheath tube are respectively wrapped around the outermost part of the optical fiber and the conductor by an extrusion device, and the first sheath tube and the second sheath tube are externally connected and fixed adjacently to obtain a primary optoelectronic composite cable;

[0007] The primary optical-electric composite cable is subjected to at least a first vacuum cooling molding and a second vacuum cooling molding to form an optical-electric composite cable, wherein the temperature of the first vacuum cooling molding is T1, and the temperature of the second vacuum cooling molding is T2, wherein T1 is greater than T2;

[0008] In the formed optoelectronic composite cable, the connection between the first sheath tube and the second sheath tube can be separated from the first sheath tube by tearing; the wall thickness of the first sheath tube and the second sheath tube is 0.1mm-1.5mm; the outer diameter of the first sheath tube is smaller than the outer diameter of the second sheath tube, and the maximum outer diameter of the optoelectronic composite cable is 4mm-12mm.

[0009] Furthermore, the T1 is 75°C-55°C, the T2 is 50°C-30°C, and the temperature difference between the T1 and the T2 is 15°C-30°C.

[0010] Furthermore, before wrapping the first sheath tube and the second sheath tube on the outermost part of the optical fiber and the conductor respectively by the extrusion device, the method includes:

[0011] The conductor is detwisted according to a first detwisting parameter to reduce the internal stress of the conductor.

[0012] Furthermore, after the primary optoelectronic composite cable is subjected to at least a first vacuum cooling molding and a second vacuum cooling molding, the method further comprises:

[0013] Straightening the optoelectronic composite cable and sequentially passing it through a marking device to mark the surface of the optoelectronic composite cable to obtain a plurality of first marks;

[0014] If the change in relative position of several first marks along the length direction of the optoelectronic composite cable relative to the first sheath tube and the second sheath tube is greater than a second preset value, the first backtwist parameter is adjusted to the second backtwist parameter until the change in relative position is less than or equal to the second preset value.

[0015] Furthermore, after the primary optoelectronic composite cable is subjected to at least a first vacuum cooling molding and a second vacuum cooling molding, the method further comprises:

[0016] Straighten the optoelectronic composite cable to obtain the first sheath tube center position A1 and the second sheath tube center position B1 at the first cross-sectional position of the optoelectronic composite cable, and the first sheath tube center position A2 and the second sheath tube center position B2 at the second cross-sectional position;

[0017] Obtaining a center line A1B1 between the center position A1 of the first sheath tube and the center position B1 of the second sheath tube, and a center line A2B2 between the center position A2 of the first sheath tube and the center position B2 of the second sheath tube;

[0018] Calculate the angle θ between the center line A1B1 and the center line A2B2. If the rate of change of the angle θ in the length direction of the optoelectronic composite cable is greater than a third preset value, adjust the first backtwist parameter to the second backtwist parameter until the change in relative position is less than or equal to the third preset value.

[0019] The second aspect of the present application provides a construction method of the optoelectronic composite cable obtained by the first aspect of the present application, wherein the optoelectronic composite cable is inserted into a pipe with an inner diameter of 6mm-13mm for use.

[0020] include:

[0021] According to the inner diameter D1 of the pipe to be passed through, the maximum outer diameter D2 of the optical-electric composite cable is selected to satisfy D2+0.1≤D1;

[0022] The optoelectronic composite cable is inserted into the pipeline in a manner that the second sheath tube is closely attached to the inner side wall of the pipeline and the first sheath tube is far away from the inner side wall of the pipeline.

[0023] Furthermore, when the optoelectronic composite cable is passed through a pipe, the second sheath tube is closely attached to the inner wall of the pipe, which is near the area where the center line of the first sheath tube and the second sheath tube intersects with the pipe cross section on one side of the second sheath tube.

[0024] Further, the method of inserting the optoelectronic composite cable into the pipe in a manner that the second sheath tube is close to the inner wall of the pipe and the first sheath tube is far away from the inner wall of the pipe comprises: configuring a flexible elongated wire rope as a guide, the length of the guide before the free end of the optoelectronic composite cable is greater than the length of the pipe, and fixing one end of the guide to the free end of the optoelectronic composite cable;

[0025] Passing the free end of the guide into the first end of the pipe and out of the second end of the pipe;

[0026] Determine a first area on the pipeline as a close contact area between the pipeline and the optoelectronic composite cable during the pipe threading;

[0027] According to a first position corresponding to the first area on the second end of the pipeline, determining that the force application direction of the guide member is between the first position and an outlet direction along the second end of the pipeline;

[0028] The guide is pulled in the direction of the force until the optoelectronic composite cable is passed from the first end of the pipe to the second end.

[0029] Further, the first position corresponding to the first area on the second end of the pipeline includes:

[0030] The relative position relationship between the first area and the marked position is determined according to the marked position outside the pipeline, and the first orientation is determined at the second end of the pipeline according to the relative position relationship.

[0031] Beneficial Effects

[0032] The processing and construction method of the optoelectronic composite cable for synchronous laying in a pipeline of the present application provides an optoelectronic composite cable with a thin wall thickness and a small overall size, so that a thin pipeline of 6mm-13mm on the market can be simultaneously passed through with an optical cable and an electrical cable, thereby saving the amount of pipeline and laying time, and broadening the use occasions of such pipelines, thereby improving the utilization rate of the pipeline.

[0033] Since the above-mentioned optoelectronic composite cable will be laid in a pipeline, the optoelectronic composite cable does not need to be self-supportingly overhead, so the design of the optoelectronic composite cable is simplified, and the thinner optical cable part is connected to the thicker electrical cable part, and the cable can provide the optical cable with the necessary tensile performance. Therefore, the corresponding design for achieving tensile performance of the optical cable part can be simplified, thereby ensuring that the optoelectronic composite cable of the present application can still meet the tensile performance requirements when it is small in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0035] Figure 1 It is a schematic cross-sectional view of an optoelectronic composite cable according to an embodiment of the present invention.

[0036] Figure 2 4 is a schematic cross-sectional view of a second optoelectronic composite cable according to an embodiment of the present invention.

[0037] Figure 3 4 is a schematic cross-sectional view of a third optoelectronic composite cable according to an embodiment of the present invention.

[0038] Figure 4 4 is a schematic cross-sectional view of a fourth optoelectronic composite cable according to an embodiment of the present invention.

[0039] Figure 5 It is a cross-sectional schematic diagram of an optoelectronic composite cable according to an embodiment of the present invention when twisting occurs.

[0040] Figure 6 The figure is a longitudinal cross-sectional schematic diagram of an optoelectronic composite cable in a pipeline according to an embodiment of the present invention.

[0041] Figure 7 The figure is a cross-sectional schematic diagram of an optoelectronic composite cable in a pipeline according to an embodiment of the present invention.

[0042] In the figure, the meanings of the reference numerals are as follows:

[0043] The first sheath tube 1, the reinforcing yarn 2, the connection 3, the optical fiber 4, the conductor 5, the insulating layer 6, the second sheath tube 7, the isolation frame 8, and the pipeline 9. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] This embodiment provides an optoelectronic composite cable that can be installed in a pipe 9 with a relatively small diameter. The pipe 9 is a common pipe in engineering, generally with an inner diameter of 6 mm to 13 mm, and is pre-buried in the wall of a building during construction. When laying cables in the later stage, the pre-buried pipe 9 is used to lay cables. Usually, each pipe 9 is used to install a single cable, such as a high-voltage cable, a low-voltage cable, or an optical cable.

[0049] like Figure 1 As shown, it is a cross-sectional schematic diagram of an optoelectronic composite cable for synchronous laying in a pipeline provided by an embodiment of the present invention. The optoelectronic composite cable of this embodiment can achieve a cross-sectional size smaller than the above-mentioned pipeline 9 at the maximum outer diameter, so the optoelectronic composite cable can be laid in the above-mentioned pipeline 9 at one time.

[0050] Depend on Figure 1It can be seen that the optoelectronic composite cable includes an optical cable part and an electrical cable part, that is, a first sheath tube 1 and a second sheath tube 7 are externally connected, adjacent to each other and fixed. The first sheath tube 1 has an optical fiber 4 built in to form the optical cable part, and the second sheath tube 7 has a conductor 5 built in to form the electrical cable part. The first sheath tube 1 can protect the optical fiber 4 therein, and the second sheath tube 7 can protect the conductor 5 therein.

[0051] Since the optical fiber 4 is relatively thin, and the conductor 5 is generally a copper wire which is thicker than the optical fiber 4, the outer diameter of the first sheath tube 1 is smaller than the outer diameter of the second sheath tube 7, and the maximum outer diameter of the optoelectronic composite cable is 4.0 mm-12 mm, so as to adapt to the current 6 mm-13 mm pipeline resources. In some specific embodiments, the outer diameter of the first sheath tube 1 is 1 mm-4 mm, and the outer diameter of the second sheath tube 7 is 5 mm-10 mm, which can be determined according to the specifications of the required cables.

[0052] In order to ensure the protective effect of the first sheath tube 1 and the second sheath tube 7, the thickness of the first sheath tube 1 and the second sheath tube 7 should be sufficient. However, since this embodiment can be laid through the pipeline 9, the pipeline 9 itself provides certain support and protection for the optoelectronic composite cable. Therefore, the tensile strength requirements for the optoelectronic composite cable, especially the more fragile optical fiber part, are relatively low. Therefore, the thickness requirements for the first sheath tube 1 and the second sheath tube 7 do not need to be too large, and there is no need to set additional reinforcement structures such as tension rods. In this embodiment, the wall thickness of the first sheath tube 1 and the second sheath tube 7 is set to 0.1mm-1.5mm, and the wall thickness of the first sheath tube 1 is less than the wall thickness of the second sheath tube 7. Generally, the wall thickness of the first sheath tube 1 is 0.3mm-0.5mm, and the wall thickness of the second sheath tube 7 is 0.5mm-1mm. The specific thickness can be determined after comprehensively considering the required strength of the optoelectronic composite cable and the diameter of the pipeline 9, ensuring that the first sheath tube 1 and the second sheath tube 7 can take into account the protective effect, tensile strength and overall size controllable within this range.

[0053] The cross-sectional profile of the optoelectronic composite cable is determined by the shape, quantity and connection relationship of the first sheath tube 1 and the second sheath tube 7. Common cross-sectional shapes of the first sheath tube 1 and the second sheath tube 7 include both being circular, one circular and one polygonal, two polygonal, etc., where polygonal means greater than or equal to three sides.

[0054] In certain preferred embodiments, Figure 1 As shown, the cross-sectional shapes of the first sheath tube 1 and the second sheath tube 7 are both circular and there is only one of them. The contact surfaces between the entire optoelectronic composite cable and the pipeline 9 when they are laid through the pipe are both arc surfaces, which are conducive to generating less friction during laying and less stress concentration, thereby facilitating the laying of the optoelectronic composite cable and preventing damage to the optoelectronic composite cable.

[0055] In addition to Figure 1 The cross-sectional form shown, Figures 2 to 4 Three other typical examples of cross-sectional profiles of optoelectronic composite cables are also shown. Figure 2 The diagram shows an optoelectronic composite cable in which a first sheath tube 1 has an elliptical ring-shaped cross section and a second sheath tube 7 has a circular ring-shaped cross section. Figure 3 It shows an optoelectronic composite cable having two first sheath tubes 1 and one second sheath tube 7, wherein the two first sheath tubes 1 are adjacently arranged outside the second sheath tube 7, and the cross-sections of the first sheath tube 1 and the second sheath tube 7 are both circular. Figure 4 The diagram shows an optoelectronic composite cable in which a first sheath tube 1 has a three-sided ring-shaped cross section and a second sheath tube 7 has a circular ring-shaped cross section.

[0056] It should be noted that the above embodiments of different profiles are only for illustration and do not exhaust all possible embodiments that meet the concept of the present application. Figure 1 The cross-sectional style shown in FIG. is used for illustration, and the corresponding parts of the other embodiments can be referred to Figure 1 Implementation will be carried out based on the introduction.

[0057] The connection relationship between the first sheath tube 1 and the second sheath tube 7 should meet the following requirements: keep the first sheath tube 1 and the second sheath tube 7 connected when separation is not required, and easily separate the first sheath tube 1 and the second sheath tube 7 when separation is required. In addition, since the outer diameter of the optoelectronic composite cable needs to be as small as possible, the connection 3 should be as short and as thin as possible while maintaining the connection between the first sheath tube 1 and the second sheath tube 7, that is, the connection 3 is a structure that is shorter in the direction connecting the first sheath tube 1 and the second sheath tube 7 and thinner in a direction perpendicular to the above direction. There is a short thin wall between the two thicker walls, so that when separation is required, the first sheath tube 1 and the second sheath tube 7 are used as the force application points and sheared along the extension direction of the short thin wall, so that the short thin wall can be easily separated along the extension direction, that is, the separation of the first sheath tube 1 and the second sheath tube 7 is achieved.

[0058] Therefore, in certain preferred embodiments, the thickness of the connection 3 is set to be 0.1mm-1.45mm smaller than the smaller wall thickness of the first and second sheath tubes 1 and 7 in the direction perpendicular to the first sheath tube 1 and the second sheath tube 7, and the length of the connection 3 is the dimension in the direction connecting the first and second sheath tubes 1 and 7 that is less than 0.1mm. For example, the wall thickness of the first sheath tube 1 is 0.3mm, the wall thickness of the second sheath tube 7 is 0.6mm, the thickness of the connection 3 is 0.2mm smaller than the wall thickness of the first sheath tube 1, that is, 0.1mm, and the length of the connection 3 is 0.05mm. Figure 1 As shown, the connection 3 is located between the first sheath tube 1 and the second sheath tube 7, and is extremely small in size, so it is not clearly shown in the figure, so that the cross-section of the entire optoelectronic composite cable is approximately an 8-shape with one end larger and the other end smaller.

[0059] In some preferred embodiments, the first sheath tube 1, the second sheath tube 7 and the connection 3 are made of flame-retardant materials such as LSZH (low-smoke zero-halogen cable) or PVC.

[0060] In some preferred embodiments, the optical fiber 4 is a tight-wrapped optical fiber or a semi-tight-wrapped optical fiber, and a tight-wrapped material with a breaking elongation greater than or equal to 100% is selected. In this way, the size of the optical cable part is as small as possible through the tight-wrapped optical fiber or the semi-tight-wrapped optical fiber. In some specific embodiments, a tight-wrapped optical fiber is selected and the outer diameter of the tight-wrapped optical fiber is controlled to be 0.4mm-0.9mm, which can be specifically determined according to the inner diameter of the pipe 9. The material of the tight-wrapped layer surrounding the outside of the optical fiber 4 is preferably a thermoplastic material such as LSZH, PVC, PA, TPU, TPEE, etc., and the tight-wrapped material can be stripped off more than 3cm at a time using Miller pliers without damaging the optical fiber.

[0061] In some preferred embodiments, the number of the optical fibers 4 is 1 to 4. The optical fibers 4 are preferably G657 with excellent bending performance to adapt to the bending laying of smaller diameters indoors.

[0062] like Figure 1 In the embodiment shown, a reinforcing yarn 2 is further provided outside the optical fiber 4 to enhance the tensile performance of the optical cable portion. The reinforcing yarn 2 can be made of tensile-resistant yarn materials such as aramid, glass fiber yarn, polyester yarn, etc. In this embodiment, the strength of the optical cable portion depends partly on the reinforcing yarn 2 and partly on the cable portion. Therefore, except for the reinforcing yarn 2, there are no other reinforcing parts inside and outside the first sheath tube 1.

[0063] In some preferred embodiments, the conductor 5 is a solid copper wire or a multi-stranded copper wire. In order to prevent the final relative position of the optical cable part and the electrical cable part from changing significantly along the length of the cable due to the twisting of the conductor 5, the internal stress of the conductor 5 is less than or equal to a first preset value. Figure 1 In the embodiment shown, the conductor 5 is in the form of 4 pairs of twisted copper wires, each pair of twisted copper wires includes 2 copper wires and a corresponding insulating layer 6, forming 4 conductors 5 with an outer diameter of 22AWG-26AWG. In this embodiment, an isolation skeleton 8 is also provided inside the first sheath to isolate the 4 pairs of twisted wires to optimize transmission performance. In some embodiments, if the transmission performance requirement is met without the isolation skeleton 8, the isolation skeleton 8 can be removed, and the size of the conductor 5 part will be reduced.

[0064] An embodiment of the present invention further provides a method for processing an optoelectronic composite cable, the method comprising the following steps:

[0065] Step S101, wrapping the first sheath tube 1 and the second sheath tube 7 on the outermost parts of the optical fiber 4 and the conductor 5 respectively by extrusion equipment, and making the first sheath tube 1 and the second sheath tube 7 externally connected and fixed adjacently to obtain a primary optoelectronic composite cable.

[0066] Step S102, subjecting the primary optoelectronic composite cable to at least a first vacuum cooling molding and a second vacuum cooling molding in sequence, wherein the temperature of the first vacuum cooling molding is T1, and the temperature of the second vacuum cooling molding is T2, and T1 is greater than T2.

[0067] In the above processing method, the components inside the first sheath tube 1 and the second sheath tube 7 are passed through the extrusion equipment according to the designed position. The extrusion equipment melts the materials of the first sheath tube 1 and the second sheath tube 7 at a high temperature of about 200°C, and forms the shapes of the first sheath tube 1 and the second sheath tube 7 through a mold to wrap the corresponding components, and make the first sheath tube 1 and the second sheath tube 7 adjacent to each other. Figure 1 The optoelectronic composite cable shown is achieved by wrapping the optical fiber 4 and the reinforcing yarn 2 into the first sheath tube 1 through an extrusion device, and wrapping the copper wire, the insulating layer 6, and the isolation frame 8 into the second sheath tube 7, and forming an 8-like connection between the first sheath tube 1 and the second sheath tube 7.

[0068] The first sheath tube 1 and the second sheath tube 7 of the primary optoelectronic composite cable just produced from the extrusion equipment are relatively high in temperature and relatively soft. At this time, the first sheath tube 1, the second sheath tube 7 and the components inside them have not yet completed the final tight wrapping and shaping. At this time, through two-stage vacuum cooling molding, that is, the primary optoelectronic composite cable is passed through the vacuum forming equipment for step-by-step cooling, the first sheath tube 1 and the second sheath tube 7 can be slowly and evenly contracted to ensure the roundness of the optoelectronic composite cable, which is beneficial to the first sheath tube 1 and the second sheath tube 7. The inner and outer surfaces of the final molding are both smooth and flat, so that the inner and outer diameters of the final finished optoelectronic composite cable are uniform.

[0069] In certain preferred embodiments, the T1 is 75°C-55°C, the T2 is 50°C-30°C, and the temperature difference between the T1 and the T2 is 15°C-30°C.

[0070] Strict size and shape control is extremely important for the optoelectronic composite cable of this embodiment.

[0071] On the one hand, for the inside of the optoelectronic composite cable, the first sheath tube 1 is wrapped evenly with the internal optical fibers 4, and the even and flat surface is not likely to cause excessive squeezing of the optical fibers 4 at certain locations, resulting in damage to the optical fibers 4 and increased attenuation. The second sheath tube 7 is wrapped evenly with the internal conductor 5, which is conducive to reducing the stress of the conductor 5, ensuring the transmission performance, and keeping the cable of the conductor 5 at a stable pitch. The stress of the conductor 5 mainly comes from the following reasons: Figure 1 If the stress of the multi-strand twisted copper wire in the embodiment shown is not removed, the relative positions of the first sheath tube 1 and the second sheath tube 7 will change in the length direction of the optoelectronic composite cable during extrusion molding, that is, the optoelectronic composite cable will be twisted. Since the optoelectronic composite cable needs to be laid in the pipeline 9 eventually, if the optoelectronic composite cable is significantly twisted, the relative position relationship between the optoelectronic composite cable and the pipeline 9 will change at different cross-sectional positions during the pipeline insertion, which is not conducive to the pipeline insertion and is also prone to cause wear on the optical cable when part of the optical cable is in close contact with the pipeline 9 at certain positions.

[0072] On the other hand, since the optoelectronic composite cable needs to be laid in the pipe 9, and the inner diameter of the pipe 9 and the overall outer diameter of the optoelectronic composite cable are both small, the gap between the two is also small. For example, the maximum outer diameter of the optoelectronic composite cable that can be passed through the pipe 9 with an inner diameter of 13 mm is 12 mm, and the gap between the two is only 1 mm. If the outer diameter of the optoelectronic composite cable is not well controlled, especially if the outer diameter is too large, the friction will increase when passing through the pipe, or even make it impossible to pass through. In addition, a poor outer diameter or obvious twisting of the optoelectronic composite cable may also cause severe squeezing between the optical cable part and the inner wall of the pipe 9, resulting in damage to the optical cable.

[0073] Therefore, based on the above reasons, in some preferred embodiments, before wrapping the first sheath tube 1 and the second sheath tube 7 outside the optical fiber 4 and the conductor 5 respectively by the extrusion device, the steps include:

[0074] Step S100, back-twisting the conductor 5 according to a first back-twisting parameter to reduce the internal stress of the conductor 5. The first back-twisting parameter is provided by a back-twisting device. Before the conductor 5 enters the extrusion device, the back-twisting device back-twistes the conductor 5 under the first back-twisting parameter to reduce the internal stress of the conductor 5 as much as possible, so that the optical-electric composite cable formed thereby is not prone to twisting.

[0075] Whether the backtwist of the conductor 5 is in place needs to be judged after the optoelectronic composite cable is formed, so as to adjust whether the backtwist parameter setting is appropriate based on the feedback of the result after forming.

[0076] In some preferred embodiments, after the primary optoelectronic composite cable is subjected to at least a first vacuum cooling molding and a second vacuum cooling molding, the method comprises:

[0077] Step S103: straighten the optoelectronic composite cable and sequentially pass it through a marking device to mark the surface of the optoelectronic composite cable to obtain a plurality of first marks.

[0078] Step S104: if the change in relative position of the first marks along the length direction of the optoelectronic composite cable relative to the first sheath tube 1 and the second sheath tube 7 is greater than a second preset value, adjust the first backtwist parameter to the second backtwist parameter until the change in relative position is less than or equal to the second preset value.

[0079] By the above method, when the optoelectronic composite cable passes through the marking device, since the marking position of the marking device is fixed, theoretically, a unified relative position relationship should be formed between the multiple marks in the length direction of the optoelectronic composite cable and the optoelectronic composite cable. Once the optoelectronic composite cable is twisted, the relative position between the optical cable part and the conductor 5 part will change in cross sections in different length directions. For example, if the twisting direction is right-handed or left-handed, then the optical cable part is located directly above the cable part in a certain section. Along the length direction, the position of the optical cable part will gradually change in a clockwise or counterclockwise direction around the cable. Generally, the greater the stress of the conductor 5, the greater the degree of twisting, and the more obvious the change in the relative position relationship between the optical cable part and the cable part. Therefore, this embodiment can reflect whether there is a relative position change between the first sheath tube 1 and the second sheath tube 7 in different cross sections through the relative position change of the above-mentioned first mark relative to the first sheath tube 1 and the second sheath tube 7 and the size of the change. For example, in a certain cross section, the first mark is located on the second sheath tube 7 and is located in the clockwise direction relative to the first sheath tube 1, while in another cross section, the first mark is located on the first sheath tube 1. It can be seen that the position of the first mark has changed significantly, and the torsion of the optoelectronic composite cable can be controlled within a reasonable range by adjusting the first torsion parameter until the above-mentioned first mark appears uniformly and stably on the optoelectronic composite tube.

[0080] The present invention also provides other embodiments to solve the torsion of the above-mentioned optoelectronic composite cable. In these preferred embodiments, after the primary optoelectronic composite cable is subjected to at least the first vacuum cooling molding and the second vacuum cooling molding, the method includes:

[0081] Step S105, straighten the optoelectronic composite cable to obtain the center position A1 of the first sheath tube 1 and the center position B1 of the second sheath tube 7 at the first cross-sectional position of the optoelectronic composite cable, and the center position A2 of the first sheath tube 1 and the center position B2 of the second sheath tube 7 at the second cross-sectional position.

[0082] Step S105 , obtaining a center line A1B1 between the center position A1 of the first sheath tube 1 and the center position B1 of the second sheath tube 7 , and a center line A2B2 between the center position A2 of the first sheath tube 1 and the center position B2 of the second sheath tube 7 .

[0083] Step S106, calculating the angle θ between the center line A1B1 and the center line A2B2. If the rate of change of the angle θ in the length direction of the optoelectronic composite cable is greater than a third preset value, adjusting the first back-twist parameter to the second back-twist parameter until the change in the relative position is less than or equal to the third preset value.

[0084] like Figure 5 As shown, in a certain embodiment, after taking two different cross sections at a distance of 10m on the optoelectronic composite cable and overlapping them, it can be seen that the positions of B1 and B2 overlap, the positions of A1 and A2 are different, and the angle θ between the center line A1B1 and the center line A2B2 is 90°, while in this embodiment, the angle θ needs to be controlled to be less than or equal to 0.2° on the two cross sections at a distance of 10m, that is, the third preset value is that the above angle θ of the optoelectronic composite cable is less than or equal to 0.2° per 10m. Therefore, the actual angle θ in this embodiment is 90°, which obviously exceeds the third preset value, and the first back-twist parameter should be adjusted until the angle θ is measured again and is less than the third preset value.

[0085] In order to smoothly pass through the pipe and protect the optical cable, Figure 6 and Figure 7 As shown, an embodiment of the present application also provides a construction method for the optoelectronic composite cable in the above-mentioned embodiment of the present application or the optoelectronic composite cable obtained by the processing method embodiment of the present application, and the optoelectronic composite cable is inserted into a pipe with an inner diameter of 6mm-13mm for use.

[0086] Furthermore, the method comprises the following steps:

[0087] Step S201, selecting the maximum outer diameter D2 of the optoelectronic composite cable according to the inner diameter D1 of the pipe 9 to be passed through so as to satisfy D2+0.1≤D1.

[0088] Step S202 , inserting the optoelectronic composite cable into the pipe 9 in a manner that the second sheath tube 7 is closely attached to the inner wall of the pipe 9 and the first sheath tube 1 is away from the inner wall of the pipe 9 .

[0089] In some preferred embodiments, when the optoelectronic composite cable is inserted into the pipe, the position of the second sheath tube 7 close to the inner wall of the pipe 9 is near the area where the center line of the first sheath tube 1 and the second sheath tube 7 intersects with the cross-section of the pipe 9 on one side of the second sheath tube 7.

[0090] like Figure 6 As shown, the outer wall of the second sheath tube 7 is in close contact with the inner wall of the pipe 9, and the first sheath tube 1 is located on the opposite side of the joint between the second sheath tube 7 and the pipe 9. Therefore, the first sheath tube 1 can be kept away from the pipe 9, thereby reducing the possibility of the more fragile optical cable part contacting the pipe 9 and reducing the possibility of damage to the optical cable during the laying and pipe threading process.

[0091] In order to realize the laying and pipe-threading in the manner described in the above embodiments, in some preferred embodiments, the optoelectronic composite cable is threaded into the pipe 9 in a manner that the second sheath tube 7 is close to the inner wall of the pipe 9 and the first sheath tube 1 is away from the inner wall of the pipe 9, including:

[0092] Step S2021, configure a flexible elongated cord as a guide, the length of the guide before the free end of the optoelectronic composite cable is greater than the length of the pipe 9, and one end of the guide is fixed to the free end of the optoelectronic composite cable. The guide is used to provide traction from the outlet side of the pipe 9 when passing through the pipe so that the optoelectronic composite cable can move from the inlet side of the pipe 9 to the outlet side under the action of the traction.

[0093] Step S2022: insert the free end of the guide into the first end of the pipe 9 and pass it out from the second end of the pipe 9. The first end is the inlet side of the pipe 9, and the second end is the outlet side of the pipe 9. At this time, when the guide is not pulled, the optical-electric composite cable is still outside the pipe 9.

[0094] Step S2023: Determine the first area on the pipe 9 as the area of ​​close contact between the pipe 9 and the optoelectronic composite cable during the pipe threading. Determine the first area on the inlet side of the pipe 9 before formally pulling the guide, so as to provide guidance for the force direction of the guide. Under the action of the correct force direction, it can ensure that the optoelectronic composite tube is in close contact with the pipe 9. Figure 6 and Figure 7 Thread the pipe in the manner shown.

[0095] Step S2024: according to the first position corresponding to the first area on the second end of the pipe 9 , determine that the force application direction of the guide member is between the first position and the outlet direction along the second end of the pipe 9 .

[0096] Step S2025: Pull the guide member in the direction of the force until the optoelectronic composite cable is passed from the first end of the pipe 9 to the second end.

[0097] Since the pipeline 9 is long, it is necessary to find the corresponding position of the first area determined on the inlet side along the pipeline 9 when the first area theoretically extends to the outlet side, and take the first orientation formed by the line connecting the corresponding position with the center of the pipeline 9 as a guide. The force direction includes the pulling force F2 from the first end to the second end of the pipeline 9 and the pressure F1 along the first orientation, so that under the action of the resultant force F formed by the pulling force and the pressure, the optical-electric composite cable can be Figure 6 and Figure 7 Thread the pipe in the manner shown.

[0098] In some preferred embodiments, the first position corresponding to the first area on the second end of the pipe 9 includes:

[0099] According to the marking position outside the pipe 9 , the relative position relationship between the first area and the marking position is determined, and according to the relative position relationship, the first orientation is determined at the second end of the pipe 9 .

[0100] In some preferred embodiments, the angle between the force application direction and the outlet direction of the second end of the pipe 9 is 10°-60°.

[0101] Through the construction method provided in the above embodiment, it is possible to ensure that the optical cable is not subjected to external pressure during the construction process, thereby ensuring normal attenuation.

[0102] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for processing an optoelectronic composite cable for synchronous laying in a pipeline, characterized in that: The method comprises the following steps: Wrapping the first sheath tube and the second sheath tube on the outermost part of the optical fiber and the conductor respectively by extrusion equipment, and making the first sheath tube and the second sheath tube externally adjacent and fixed, so as to obtain a primary optoelectronic composite cable; The primary optical-electric composite cable is subjected to at least a first vacuum cooling molding and a second vacuum cooling molding to form an optical-electric composite cable, wherein the temperature of the first vacuum cooling molding is T1, and the temperature of the second vacuum cooling molding is T2, wherein T1 is greater than T2; In the formed optoelectronic composite cable, the connection between the first sheath tube and the second sheath tube can be separated from the first sheath tube by tearing; the wall thickness of the first sheath tube and the second sheath tube is 0.1mm-1.5mm; the outer diameter of the first sheath tube is smaller than the outer diameter of the second sheath tube, and the maximum outer diameter of the optoelectronic composite cable is 4mm-12mm.

2. The method according to claim 1, characterized in that The T1 is 75°C-55°C, the T2 is 50°C-30°C, and the temperature difference between the T1 and the T2 is 15°C-30°C.

3. The method according to claim 1, characterized in that Before wrapping the first sheath tube and the second sheath tube on the outermost part of the optical fiber and the conductor respectively by the extrusion device, the method comprises: The conductor is detwisted according to a first detwisting parameter to reduce the internal stress of the conductor.

4. The method according to claim 2, characterized in that: After the primary optoelectronic composite cable is subjected to at least a first vacuum cooling molding and a second vacuum cooling molding, the method comprises: Straightening the optoelectronic composite cable and sequentially passing it through a marking device to mark the surface of the optoelectronic composite cable to obtain a plurality of first marks; If the change in relative position of several first marks along the length direction of the optoelectronic composite cable relative to the first sheath tube and the second sheath tube is greater than a second preset value, the first backtwist parameter is adjusted to the second backtwist parameter until the change in relative position is less than or equal to the second preset value.

5. The method according to claim 2, characterized in that: After the primary optoelectronic composite cable is subjected to at least a first vacuum cooling molding and a second vacuum cooling molding, the method comprises: Straighten the optoelectronic composite cable to obtain the first sheath tube center position A1 and the second sheath tube center position B1 at the first cross-sectional position of the optoelectronic composite cable, and the first sheath tube center position A2 and the second sheath tube center position B2 at the second cross-sectional position; Obtaining a center line A1B1 between the center position A1 of the first sheath tube and the center position B1 of the second sheath tube, and a center line A2B2 between the center position A2 of the first sheath tube and the center position B2 of the second sheath tube; Calculate the angle θ between the center line A1B1 and the center line A2B2. If the rate of change of the angle θ in the length direction of the optoelectronic composite cable is greater than a third preset value, adjust the first backtwist parameter to the second backtwist parameter until the change in relative position is less than or equal to the third preset value.

6. A construction method for an optoelectronic composite cable obtained by using any one of claims 1 to 5, characterized in that: The photoelectric composite cable is sleeved in a pipe with an inner diameter of 6mm-13mm for use.

7. The method according to claim 6, characterized in that The method comprises the following steps: According to the inner diameter D1 of the pipe to be passed through, the maximum outer diameter D2 of the optical-electric composite cable is selected to satisfy D2+0.1≤D1; The optoelectronic composite cable is inserted into the pipeline in a manner that the second sheath tube is closely attached to the inner side wall of the pipeline and the first sheath tube is far away from the inner side wall of the pipeline.

8. The method according to claim 7, characterized in that When the optoelectronic composite cable is passed through a pipe, the second sheath tube is close to the inner wall of the pipe, which is near the area where the center line of the first sheath tube and the second sheath tube intersects with the pipe cross section on one side of the second sheath tube.

9. The method according to claim 7, characterized in that: The method of inserting the optoelectronic composite cable into the pipeline in a manner that the second sheath tube is closely attached to the inner side wall of the pipeline and the first sheath tube is far away from the inner side wall of the pipeline comprises: A flexible elongated cord is configured as a guide, wherein the length of the guide located before the free end of the optoelectronic composite cable is greater than the length of the pipe, and one end of the guide is fixed to the free end of the optoelectronic composite cable; Passing the free end of the guide into the first end of the pipe and out of the second end of the pipe; Determine a first area on the pipeline as a close contact area between the pipeline and the optoelectronic composite cable during the pipe threading; According to a first position corresponding to the first area on the second end of the pipeline, determining that the force application direction of the guide member is between the first position and an outlet direction along the second end of the pipeline; The guide is pulled in the direction of the force until the optoelectronic composite cable is passed from the first end of the pipe to the second end.

10. The method according to claim 9, characterized in that The first position corresponding to the first area on the second end of the pipeline includes: The relative position relationship between the first area and the marked position is determined according to the marked position outside the pipeline, and the first orientation is determined at the second end of the pipeline according to the relative position relationship.

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