Remote assembly with high flame retardant grade and preparation process thereof

Abstract

The high-flame-retardant-grade remote assembly comprises a resistor body, the resistor body comprises an outer sheath and two filling assemblies, the two sides of the inner wall of the outer sheath are fixedly connected with one sides of the two filling assemblies respectively, two symmetrically-arranged flame-retardant assemblies are fixedly installed in the outer sheath, and the flame-retardant assemblies are fixedly installed in the outer sheath. Color strips are fixedly mounted on the surface of the outer sheath, each of the two filling assemblies comprises a filling rope and a first aramid yarn, the outer side of the first aramid yarn is fixedly connected with the inner side of the filling rope, and the flame-retardant assembly comprises a subunit sheath, a second aramid yarn and a tight-buffered optical fiber. The characteristics of high flame retardance and high fire resistance are met, and the cost factor is fully considered; the bonding of the reinforcer, the sub-cable and the sheath is precisely controlled; a proper extrusion process and a connector processing process are formulated, and a low-shrinkage material is matched to control the post-shrinkage of the protective layer, so that the problem of increase of optical fiber loss of the assembly is solved.

Description

Technical Field

[0001] The invention relates to the technical field of high flame retardant grade telescopic components, in particular to a high flame retardant grade telescopic component and a preparation process thereof. Background Art

[0002] High flame retardant grade remote components are used for data transmission from mobile base stations to radio frequency remote units, fiber to tower connections, and are used for vertical and horizontal wiring of wireless base stations. They have good mechanical and environmental performance, all-dielectric structure design, and are free from electromagnetic induction effects.

[0003] The comparative document, application number 202111075359.1, discloses a telescopic component and a method for making the same, the method comprising: putting a crimping spiral tube, a crimping support and a crimping sleeve on the end of an optical cable with exposed optical fiber; injecting thermosetting resin glue into the optical fiber access port, inserting the exposed optical fiber into the optical fiber access port and then performing a curing treatment; crimping the crimping spiral tube, the crimping support and the crimping sleeve with the connector to form a telescopic component. The present invention uses crimping instead of glue potting to achieve fixation at the optical cable branch line, thereby improving production efficiency and overcoming the waste and pollution of glue. At the same time, the crimping connection method can provide better tensile performance, effectively ensuring the stability and reliability of optical transmission. In addition, the crimping connection method is less affected by changes in ambient temperature, thereby enhancing the structural stability of the telescopic component;

[0004] The comparative document, application number 201721097415.0, is a multi-core remote component, which relates to the technical field of optical signal transmission solutions for fiber to the tower (FTTA) technology, including an MTP / MPO connector, a multi-core splitter, a branch armored protection tube, a multi-core high-density remote optical cable, and multiple LC duplex connectors. The multi-core high-density remote optical cable connects the MTP / MP0 connector and multiple LC duplex connectors. The MTP / MPO connector and the LC duplex connector are also connected to a multi-core splitter. A branch armored protection tube is provided on the multi-core high-density remote optical cable between the MTP / MPO connector and the multi-core splitter, which realizes parallel transmission of digital signals between RRU and BBU, and has the advantages of anti-bending, anti-compression and anti-rat bite.

[0005] However, the above-mentioned comparative documents still have the following shortcomings:

[0006] Although the telescopic components produced in the above-mentioned documents have the characteristics of local resistance to bending and compression, they cannot meet people's needs for use in high temperature environments. Summary of the invention

[0007] The purpose of the present invention is to provide a high flame retardant grade telescopic component and its preparation process, so as to solve the problem that the telescopic component produced by the above document proposed in the above background technology has the characteristics of local bending and compression resistance, but cannot meet people's use needs in high temperature environment.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high flame retardant grade telescopic component, comprising a barrier body, the barrier body comprising an outer sheath and two filling components, the two sides of the inner wall of the outer sheath are respectively fixedly connected to one side of the two filling components, the interior of the outer sheath is fixedly installed with two symmetrically arranged flame retardant components, the surface of the outer sheath is fixedly installed with color strips, the two filling components each comprise a filling rope and a first aramid yarn, the outer side of the first aramid yarn is fixedly connected to the inner side of the filling rope, the flame retardant component comprises a subunit sheath, a second aramid yarn and a tight-fitting optical fiber, the outer side of the tight-fitting optical fiber is fixedly connected to the inner side of the second aramid yarn, and the outer side of the second aramid yarn is fixedly connected to the inner side of the subunit sheath.

[0009] As a preferred technical solution of the present invention, the outer sides of the two filling ropes are fixedly connected to the outer sheath.

[0010] As a preferred technical solution of the present invention, the connection between the tight-sleeved optical fiber and the second aramid yarn is filled with a plurality of water-blocking powders.

[0011] As a preferred technical solution of the present invention, the outer side of the subunit sheath is fixedly connected to the outer sheath.

[0012] The present invention provides a preparation process of a high flame retardant grade telescopic component, comprising the following steps:

[0013] Step 1, a pay-off rack for a twisting cage: the prepared outer sheath, the filling component and the flame retardant component are wound in order on the corresponding pay-off rack, and the pay-off rack is rotated to release them;

[0014] Step 2: Sizing die: determine the inner diameter and outer diameter of the outer sheath, filling component and flame retardant component and perform surface treatment on them;

[0015] Step 3, extruder head mold: the paste injection system injects the raw materials for preparing the outer sheath, the filling component and the flame retardant component into the extruder. After the extruder parameters are set, the raw materials for the outer sheath, the filling component and the flame retardant component are prepared through the transmission system, the machine chamber, the feeding system, the screw and the head;

[0016] Step 4, hot water tank: hot water is injected into the hot water tank to cool down the outer sheath, filling components and flame retardant components for the first time;

[0017] Step 5, cold water tank: cold water is injected into the cold water tank to clean and cool the outer sheath, filling components and flame retardant components after cleaning in the hot water tank through the main traction system and auxiliary traction system to ensure the quality of the loose tube;

[0018] Step 6, blow dryer: the blow dryer cleans the moisture adhering to the surface of the cooled outer sheath, filling component and flame retardant component to ensure the cleanliness of the outer sheath, filling component and flame retardant component themselves, and then assembles the outer sheath, filling component and flame retardant component to obtain the flame retardant body;

[0019] Step 7, inkjet printer: Place the cooled and dried resistor body on the inkjet printer for inkjet printing;

[0020] Step 8: Metering wheel: Place the printed block body on the meter wheel to measure the length;

[0021] Step 9: Wire storage rack: After the resistor body is measured, it is placed in the wire storage rack in order;

[0022] Step 10, take-up frame: When using the block body, rotate the take-up frame to release it.

[0023] As a preferred technical solution of the present invention, the surface treatment in step 2 is specifically a destaticizing treatment to remove static electricity and dust on the surface of the outer sheath, the filling component and the flame retardant component.

[0024] As a preferred technical solution of the present invention, the paste injection system in step three is specifically to inject the fiber paste into the outer sheath simultaneously with the filling component and the flame retardant component at a stable and appropriate speed.

[0025] As a preferred technical solution of the present invention, the main traction system in step five is specifically to set a suitable water temperature difference between the front and rear cooling water tanks with the main traction as the boundary in the single traction system, that is, to effectively control the excess length of the filling component and the flame retardant component in the outer sheath. The auxiliary traction system in step five can conveniently adjust the auxiliary traction tension to control the degree of cold shrinkage of the outer sheath in the cold water tank, and effectively control the excess length of the filling component and the flame retardant component in the outer sheath.

[0026] As a preferred technical solution of the present invention, the extruder parameter setting in step 3 is specifically to set a suitable stretch ratio according to the performance of the material, and the stretch ratio calculation formula is: D is the inner diameter of the mold cover, d is the outer diameter of the mold core, D1 is the outer diameter of the outer sheath, d1= is the inner diameter of the outer sheath, and the tensile balance calculation formula is:

[0027]

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. Through screening and optimization, find the sheath material that meets the needs, which not only meets the high flame retardant and high fireproof characteristics, but also fully considers the cost factors; the bonding of reinforcements, sub-cables and sheaths is precisely controlled to avoid loosening and separation problems; formulate appropriate extrusion process and connector processing technology, and then use low shrinkage materials to control the shrinkage of the sheath and solve the problem of increased optical fiber loss in the components;

[0030] 2. The sheath material and subunits are made of ultra-high flame-retardant LSZH sheath material, which meets B1 combustion grade. This project adopts the 0+4 structure of the long-distance optical cable, and the product size is 6.5 (± 0.1) mm. A layer of water-blocking powder is coated between the subunit and the filling rope of this project, which meets the high-strength tensile strength and has water-blocking performance. A color strip is added to the outer sheath, which is easy to distinguish and track. The optical cable and splitter have a tensile strength of 250N. The connector meets the UL94-V0 grade. The connectors at both ends are quickly connected, without welding, and the construction is convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the barrier body of the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of the filling component of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the flame retardant assembly of the present invention;

[0034] Figure 4 is a flow chart of the present invention;

[0035] Figure 5 It is a schematic diagram of the production of the present invention.

[0036] In the figure: 1. flame retardant body; 2. outer sheath; 3. filling component; 31. filling rope; 32. first aramid yarn; 4. flame retardant component; 41. subunit sheath; 42. second aramid yarn; 43. water-blocking powder; 44. tight-buffered optical fiber; 5. color strip. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] See also Figure 1-5The present invention provides a high flame retardant grade telescopic component, including a barrier body 1, the barrier body 1 including an outer sheath 2 and two filling components 3, the two sides of the inner wall of the outer sheath 2 are respectively fixedly connected to one side of the two filling components 3, the inner part of the outer sheath 2 is fixedly installed with two symmetrically arranged flame retardant components 4, the surface of the outer sheath 2 is fixedly installed with color strips 5, the two filling components 3 each include a filling rope 31 and a first aramid yarn 32, the outer side of the first aramid yarn 32 is fixedly connected to the inner side of the filling rope 31, the flame retardant component 4 includes a subunit sheath 41, a second aramid yarn 42 and a tight-fitting optical fiber 44, the outer side of the tight-fitting optical fiber 44 is fixedly connected to the inner side of the second aramid yarn 42, and the outer side of the second aramid yarn 42 is fixedly connected to the inner side of the subunit sheath 41.

[0039] The outer sides of the two filling ropes 31 are fixedly connected to the outer sheath 2 .

[0040] The connection between the tight-fitting optical fiber 44 and the second aramid yarn 42 is filled with a plurality of water-blocking powders 43 .

[0041] The outer side of the subunit sheath 41 is fixedly connected to the outer sheath 2 .

[0042] The present invention provides a preparation process of a high flame retardant grade telescopic component, comprising the following steps:

[0043] Step 1, a pay-off frame for a twisting cage: the outer sheath 2, the filling component 3 and the flame retardant component 4 are wound in order on the corresponding pay-off frame, and the pay-off frame is rotated to release them;

[0044] Step 2, sizing die: determine the inner diameter and outer diameter of the outer sheath 2, the filling component 3 and the flame retardant component 4 and perform surface treatment on them;

[0045] Step 3, extruder head mold: the ointment injection system injects the raw materials for preparing the outer sheath 2, the filling component 3 and the flame retardant component 4 into the extruder. After the extruder parameters are set, the raw materials for preparing the outer sheath 2, the filling component 3 and the flame retardant component 4 are prepared through the transmission system, the machine chamber, the feeding system, the screw and the head;

[0046] Step 4, hot water tank: hot water is injected into the hot water tank to cool the outer sheath 2, the filling component 3 and the flame retardant component 4 for the first time;

[0047] Step 5, cold water tank: cold water is injected into the cold water tank to clean and cool the outer sheath 2, the filling component 3 and the flame retardant component 4 after cleaning in the hot water tank through the main traction system and the auxiliary traction system to ensure the quality of the loose tube;

[0048] Step 6, blow dryer: the blow dryer cleans the moisture adhering to the surface of the cooled outer sheath 2, the filling component 3 and the flame retardant component 4 to ensure the cleanliness of the outer sheath 2, the filling component 3 and the flame retardant component 4, and then assembles the outer sheath 2, the filling component 3 and the flame retardant component 4 to obtain the flame retardant body 1;

[0049] Step 7, inkjet printer: the cooled and dried resistor body 1 is placed on the inkjet printer for inkjet printing;

[0050] Step 8: Metering wheel: the printed block body 1 is placed on the meter wheel to measure the length;

[0051] Step 9, wire storage rack: after being weighed, the resistor body 1 is placed in the wire storage rack in order;

[0052] Step 10, wire take-up frame: when using the blocking element body 1, rotate the wire take-up frame to release it.

[0053] The surface treatment in step 2 is specifically a destaticizing treatment to remove static electricity and dust on the surfaces of the outer sheath 2 , the filling component 3 and the flame retardant component 4 .

[0054] In step 3, the paste injection system specifically injects the fiber paste into the outer sheath 2 simultaneously with the filling component 3 and the flame retardant component 4 at a stable and appropriate speed.

[0055] The main traction system in step five is specifically to set a suitable water temperature difference between the front and rear cooling water tanks with the main traction as the boundary in the single traction system, so as to effectively control the excess length of the filling component 3 and the flame retardant component 4 in the outer sheath 2. The auxiliary traction system in step five can conveniently adjust the auxiliary traction tension to control the degree of cold shrinkage of the outer sheath 2 in the cold water tank, and effectively control the excess length of the filling component 3 and the flame retardant component 4 in the outer sheath 2.

[0056] The extruder parameter setting in step 3 is to set a suitable stretch ratio according to the performance of the material. The stretch ratio calculation formula is: D is the inner diameter of the mold cover, d is the outer diameter of the mold core, D1 is the outer diameter of the outer sheath 2, d1= is the inner diameter of the outer sheath 2, and the tensile balance calculation formula is:

[0057] In the present invention, in conjunction with the specification Figure 5, select ultra-high flame retardant LSZH sheath material, use the 0+4 structure of the pull-out cable, and the sub-unit outer sheath adopts highly flame retardant LSZH sheath material. By designing a grinding fixture to fix the bending of the optical cable, the product can be in a natural state to ensure that the 3D interference requirements of the product meet the IEC standard; by replacing the material supplier to debug the optical cable, select the most cost-effective solution, and accurately control the process to ensure the product size, the center line of the line and the mold, the concentricity of the mold, the extrusion temperature setting, and the pitch of the sub-unit to solve the adhesion between the outer sheath and the sub-unit; by controlling the equipment parameters and temperature, efficient production is guaranteed under the premise of good product performance; by designing an AB glue gluing fixture, the glue amount and glue output speed are controlled to ensure efficient production of branches; by designing a curing and grinding fixture, the 3D data and test performance of the product are guaranteed to be qualified to ensure the quality of the product, combined with the instructions attached Figure 4 ,

[0058] The prepared outer sheath 2, filling component 3 and flame retardant component 4 are wound in order on the corresponding pay-off frame, and released by rotating the pay-off frame; the inner diameter and external position of the outer sheath 2, filling component 3 and flame retardant component 4 are determined and surface treated; the paste injection system injects the raw materials for preparing the outer sheath 2, filling component 3 and flame retardant component 4 into the extruder, and after the extruder parameters are set, the raw materials of the outer sheath 2, filling component 3 and flame retardant component 4 are prepared through the transmission system, machine chamber, feeding system, screw and head; the bent needle head will cause the fiber paste liquid level to tilt seriously, increasing the probability of the filling component 3 and the flame retardant component 4 adhering to the tube wall; and during the fiber paste injection process, the normal direction of the fiber paste injection is changed, causing the filling component 3 and the flame retardant component 4 to shake, resulting in instability of the sleeve diameter and affecting the consistency of the excess length of the filling component 3 and the flame retardant component 4 and the stability of the filling component 3 and the flame retardant component 4 during operation, and even causing fiber breakage. The oil needle needle must be concentric with the mold core; the needle tip extends out of the mold core end face 1-2 mm; when adjusting, pay attention to whether the needle is in contact with the inner hole of the mold core; hot water is injected into the hot water tank to cool the outer sheath 2, filling component 3 and flame retardant component 4 for the first time; cold water is injected into the cold water tank to clean the outer sheath 2, filling component 3 and flame retardant component 4 cleaned in the hot water tank through the main traction system and the auxiliary traction system to ensure the quality of the loose tube; the dryer cleans the moisture adhering to the surface of the cooled outer sheath 2, filling component 3 and flame retardant component 4 to ensure the cleanliness of the outer sheath 2, filling component 3 and flame retardant component 4, and then assembles the outer sheath 2, filling component 3 and flame retardant component 4 to obtain the resistor body 1; the cooled and dried resistor body 1 is placed on the printing inkjet printer for inkjet printing; the printed resistor body 1 is placed on the meter wheel to measure the length; the resistor body 1 is measured and placed in the wire storage rack in order; when the resistor body 1 is used, the wire take-up rack is rotated to release it. The technical indicators of the resistor body 1 in this project are as follows:

[0059] project value Short-term pull 500N Long-term tension 300N Flame retardant properties B1

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high flame retardant extension assembly, comprising a flame retardant body (1), characterized in that: The barrier body (1) comprises an outer sheath (2) and two filling components (3), the two sides of the inner wall of the outer sheath (2) are respectively fixedly connected to one side of the two filling components (3), the inner part of the outer sheath (2) is fixedly installed with two symmetrically arranged flame retardant components (4), the surface of the outer sheath (2) is fixedly installed with color strips (5), the two filling components (3) each comprise a filling rope (31) and a first aramid yarn (32), the outer side of the first aramid yarn (32) is fixedly connected to the inner side of the filling rope (31), the flame retardant component (4) comprises a subunit sheath (41), a second aramid yarn (42) and a tight-fitting optical fiber (44), the outer side of the tight-fitting optical fiber (44) is fixedly connected to the inner side of the second aramid yarn (42), and the outer side of the second aramid yarn (42) is fixedly connected to the inner side of the subunit sheath (41).

2. A high flame retardant extension assembly according to claim 1, characterized in that: The outer sides of the two filling ropes (31) are fixedly connected to the outer sheath (2).

3. The high flame retardant grade telescopic assembly according to claim 1, characterized in that: The connection between the tight-fitting optical fiber (44) and the second aramid yarn (42) is filled with a plurality of water-blocking powders (43).

4. The high flame retardant grade telescopic assembly according to claim 1, characterized in that: The outer side of the subunit sheath (41) is fixedly connected to the outer sheath (2).

5. The preparation process of a high flame retardant grade telescopic component according to claim 1, characterized in that: The following steps are involved: Step 1, a cage pay-off rack: winding the prepared outer sheath (2), the filling component (3) and the flame retardant component (4) in order on the corresponding pay-off rack, and releasing them by rotating the pay-off rack; Step 2, sizing die: determine the inner diameter and outer diameter of the outer sheath (2), the filling component (3) and the flame retardant component (4) and perform surface treatment on them; Step 3, extruder head mold: the paste injection system injects the raw materials for preparing the outer sheath (2), the filling component (3) and the flame retardant component (4) into the extruder. After the extruder parameters are set, the raw materials for the outer sheath (2), the filling component (3) and the flame retardant component (4) are prepared through the transmission system, the machine chamber, the feeding system, the screw and the head; Step 4, hot water tank: hot water is injected into the hot water tank to cool the outer sheath (2), the filling component (3) and the flame retardant component (4) for the first time; Step 5, cold water tank: cold water is injected into the cold water tank to clean and cool the outer sheath (2), the filling component (3) and the flame retardant component (4) after cleaning in the hot water tank through the main traction system and the auxiliary traction system to ensure the quality of the loose tube; Step 6, blow dryer: the blow dryer is used to clean the moisture adhering to the surface of the cooled outer sheath (2), the filling component (3) and the flame retardant component (4), so as to ensure the cleanliness of the outer sheath (2), the filling component (3) and the flame retardant component (4), and then the outer sheath (2), the filling component (3) and the flame retardant component (4) are assembled to obtain the flame retardant body (1); Step 7, inkjet printer: Place the cooled and dried resistor body (1) on the inkjet printer for inkjet printing; Step 8: Metering wheel: Place the printed block body (1) on the metering wheel to measure the length; Step 9: Wire storage rack: After weighing, the resistor body (1) is placed in order on the wire storage rack; Step 10, wire take-up frame: When using the blocking element body (1), rotate the wire take-up frame to release it.

6. The process for preparing a high flame retardant grade telescopic component according to claim 5, characterized in that: The surface treatment in step 2 is specifically a destaticizing treatment to remove static electricity and dust on the surfaces of the outer sheath (2), the filling component (3) and the flame retardant component (4).

7. The process for preparing a high flame retardant grade telescopic component according to claim 5, characterized in that: In the step three, the paste injection system specifically injects the fiber paste into the outer sheath (2) simultaneously with the filling component (3) and the flame retardant component (4) at a stable and appropriate speed.

8. The process for preparing a high flame retardant grade telescopic component according to claim 5, characterized in that: The main traction system in step 5 is specifically to set a suitable water temperature difference between the front and rear cooling water tanks with the main traction as the boundary in the single traction system, that is, to effectively control the excess length of the filling component (3) and the flame retardant component (4) in the outer jacket (2). The auxiliary traction system in step 5 can conveniently adjust the auxiliary traction tension to control the degree of cold shrinkage of the outer jacket (2) in the cold water tank, and effectively control the excess length of the filling component (3) and the flame retardant component (4) in the outer jacket (2).

9. The process for preparing a high flame retardant grade telescopic component according to claim 5, characterized in that: The extruder parameter setting in step 3 is specifically to set a suitable stretch ratio according to the performance of the material, and the stretch ratio calculation formula is: D is the inner diameter of the mold cover, d is the outer diameter of the mold core, D1 is the outer diameter of the outer sheath (2), d1= is the inner diameter of the outer sheath (2), and the tensile balance calculation formula is:

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