A fully dry bio-infestation resistant optical cable and its manufacturing equipment and method

Abstract

This invention discloses a fully dry, bio-resistant optical cable and its manufacturing equipment and method. The manufacturing equipment includes an extrusion mold mechanism and a gas-filled molding mechanism. The extrusion mold mechanism includes a die head, a splitter cone, a mold core, a mold cover, and a fiber guide tube. The splitter cone is used to connect to the sleeve inlet and is installed in the central cone hole of the die head. The mold core is installed inside the splitter cone. In this invention, when the loose tube is formed at the mold cover, it is filled with gas. This ensures that there is no adhesion between the optical fiber, the water-blocking yarn of the sleeve, and the inner wall of the loose tube, guaranteeing the long-term stability of the optical fiber's transmission performance and excess length. The gas support also ensures the roundness of the loose tube. This solves the problem of unstable excess length and substandard roundness caused by frictional contact due to the lack of grease in fully dry optical cables.

Description

Technical Field

[0001] This invention relates to the field of optical cable manufacturing equipment technology, and in particular to a fully dry, bio-resistant optical cable and its manufacturing equipment and method. Background Technology

[0002] All-dry, bio-resistant optical cables refer to cables that do not use grease filling inside; instead, an external sheath protects the internal optical fibers from bio-infestation. The internal components include optical fibers and water-blocking yarn within the sheath. A key challenge in manufacturing such cables is preventing the optical fibers from sticking together inside the sheath without grease. Fiber slack length is a crucial parameter in optical cable manufacturing, essential for ensuring installation and communication quality. Maintaining stable fiber slack length is a major challenge in the production of all-dry, grease-free loose tube optical cables. Traditional loose tube manufacturing processes involve filling the loose tube with grease, which acts as a lubricant for the optical fiber. This prevents the fiber from contacting the inner wall of the loose tube after passing through the extruder. When producing dry fiber optic loose tubes, the non-lubricated water-blocking yarn replaces the original filling grease. As a result, the fiber will immediately come into contact with the inner wall of the loose tube after passing through the extruder head. The friction coefficient between the hot loose tube material and the fiber is very high, which pulls the fiber and produces excess length. This makes the excess length of the fiber very large and uncontrollable.

[0003] Another challenge is ensuring the stability of fiber optic excess length. In traditional loose tube manufacturing, the fiber slides freely within the grease in the loose tube, and the speed difference in traction effectively controls the excess length. However, in dry fiber optic cables, the loose tube shrinks after forming and cooling, further increasing the excess length and exacerbating the problem. This is the main technological challenge: how to reduce the coefficient of friction between the fiber and the inner wall of the loose tube to allow the fiber to slide freely within the tube, and how to find a method to minimize shrinkage after forming and cooling. This is crucial for maintaining stable fiber optic excess length.

[0004] There are also issues regarding the diameter and roundness of the fiber optic loose tubes. The loose tubes need to conform to the diameter specified in the optical cable structure design and remain stable, while also meeting roundness requirements. In traditional loose tube manufacturing, the grease inside the tube provides support, and the injection volume of the grease can be easily controlled to maintain the tube's diameter. Because the grease is viscous and does not flow easily, this effectively maintains the tube's roundness. However, when producing dry-type fiber optic loose tubes, since the tube only contains the optical fiber and water-blocking yarn, without the original viscous grease supporting the tube wall, the loose tube deforms immediately after extrusion, making it impossible to guarantee the required diameter and roundness. Summary of the Invention

[0005] Therefore, there is a need to provide a fully dry anti-biological-infestation optical cable and its manufacturing equipment and method to solve the problems of unstable excess length and substandard roundness caused by frictional contact due to the lack of grease during the manufacturing of fully dry anti-biological-infestation optical cables.

[0006] To achieve the above objectives, the present invention provides a fully dry, bio-resistant optical cable manufacturing device, comprising: an extrusion mold mechanism and an inflation molding mechanism. The extrusion mold mechanism includes a die head, a flow divider cone, a die core, a die cover, and a fiber guide needle tube. The flow divider cone is used to connect to the sleeve inlet and is installed in the central conical hole of the die head. The die core is installed in the flow divider cone, and the die cover is installed in the central conical hole of the die head and outside the die core. The die cover and the die core form an annular flow channel communicating with the inlet. The raw material from the sleeve inlet forms a loose sleeve at the die cover. The fiber guide needle tube is hollow and installed in the center of the die core, with its head close to the central conical hole of the die head. The inflation molding mechanism includes a fiber guide needle... The system comprises a fiber guide tube, an inflation chamber tube, and an inflation device. The fiber guide tube is a cylindrical structure with a fiber guide hole in the middle, through which the optical fiber and the water-blocking yarn of the sleeve pass. The head of the fiber guide tube is airtightly connected to the tail of the fiber guide needle tube. The inflation chamber tube is sleeved over the fiber guide tube, and its head is connected to the machine head. A flowable inflation chamber is formed between the inflation chamber tube and the fiber guide tube. The inflation chamber tube has an air inlet and an air outlet that communicate with the inflation chamber. The air outlet is equipped with an inflation device. The fiber guide hole of the fiber guide tube and the hollow part of the fiber guide needle tube are isolated from the gas inside the inflation chamber tube. The air inlet is used to connect to the air source mechanism. The gas from the air inlet passes through the inflation chamber and then enters the loose sleeve tube through the outer side of the fiber guide needle tube.

[0007] Furthermore, it also includes a micro dust filter element, which is installed on the inner wall of the fiber guide hole of the fiber guide tube, and the tail of the fiber guide needle tube presses against the micro dust filter element.

[0008] Furthermore, it also includes an air source mechanism, which includes compressed air, a filter device, and a pressure regulating device. The compressed air is connected to the inlet of the filter device through a pipe, the outlet of the filter device is connected to the inlet of the pressure regulating device, and the outlet of the pressure regulating device is connected to the air inlet.

[0009] Furthermore, the filtration device is an air filtration device and / or a dust filtration device; the air filtration device is an air dewatering purifier and / or the dust filtration device is a dust collection bag and a micro dust filter element.

[0010] Furthermore, it also includes a vacuum cleaner and a dust collection bag, which are installed outside the inflation forming mechanism and in the travel path of the water-blocking yarn in the sleeve.

[0011] Furthermore, it also includes a fixed base and a base fixing slide plate. The head of the inflation chamber tube is adapted to and sealed to the shoulder of the fiber guide tube. The fixed base is sleeved on the outer side of the inflation chamber tube. The outer side of the fixed base is connected to the base fixing slide plate and can slide freely. The base fixing slide plate is fixedly connected to the machine head.

[0012] Furthermore, the air inlet and air outlet are asymmetrically arranged on the inflation chamber tube.

[0013] Furthermore, the diameter of the air inlet and vent is 6mm to 8mm and / or the venting device includes a silencer venting valve.

[0014] This invention also provides a method for manufacturing a fully dry, bio-resistant optical cable. The method employs the fully dry, bio-resistant optical cable manufacturing equipment described in any one of the claims of this invention, and includes the following steps:

[0015] The optical fiber and the water-blocking yarn in the sleeve are inserted into the fiber guide tube and pulled out after passing through the extrusion die head;

[0016] Connect the air inlet to the air source mechanism to pressurize the gas into the inflation chamber tube;

[0017] Connect the tube inlet to the extruder outlet, squeeze the tube raw material into the tube inlet, and extrude it through the die head to form a loose tube. The loose tube covers the optical fiber and the water-blocking yarn of the tube. Seal the frontmost loose tube, the optical fiber and the water-blocking yarn of the tube, and fill the loose tube with gas to form an optical cable.

[0018] This invention provides a fully dry, bio-infested resistant optical cable, which is manufactured using the fully dry, bio-infested resistant optical cable manufacturing method described in this invention.

[0019] Unlike existing technologies, the above solution incorporates an inflation chamber on the outside of the fiber guide tube, with the head of the fiber guide tube airtightly connected to the tail of the fiber guide needle tube. This allows gas from the air inlet to pass through the inflation chamber and then through the outer surface of the fiber guide needle tube into the loose tube. The gas inflates the outside of the fiber guide needle tube, preventing significant vibration of the optical fiber and the water-blocking yarn of the sleeve. When the loose tube is formed at the mold cap, it is filled with gas, ensuring no adhesion between the optical fiber, the water-blocking yarn of the sleeve, and the inner wall of the loose tube, thus guaranteeing the long-term stability of the optical fiber's transmission performance and excess length. The gas support also ensures the roundness of the loose tube. This solves the problems of unstable excess length and substandard roundness caused by frictional contact due to the lack of grease in all-dry optical cables. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural diagram of the manufacturing equipment of the present invention;

[0021] Figure 2 This is an exploded structural diagram of the inflatable molding mechanism of the present invention;

[0022] Figure 3 This is a schematic diagram of the all-dry optical cable structure of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Filtration device;

[0025] 2. Voltage regulating device;

[0026] 3. Dust collection bag;

[0027] 4. Water-blocking yarn in the sleeve;

[0028] 5. Vacuum cleaner;

[0029] 6. Optical fiber;

[0030] 7. Compressed air;

[0031] 8. The base secures the skateboard;

[0032] 9. Fiber optic cable;

[0033] 10. Airflow direction;

[0034] 11. Inflatable cavity tube;

[0035] 12. Fixing bolts;

[0036] 13. Fix the base;

[0037] 14. Inflatable chamber;

[0038] 15. Venting device;

[0039] 16. Miniature dust filter element;

[0040] 17. Base fixing bracket;

[0041] 18. Machine head;

[0042] 19. Fiber guide needle;

[0043] 20. Feed inlet;

[0044] 21. Flow divider cone;

[0045] 22. Mold core;

[0046] 23. Mold cover;

[0047] 40. Fiber guide hole;

[0048] 41. Fiber optic cable connection bolts;

[0049] 42. Air intake vent;

[0050] 43. Vent hole;

[0051] 44. Cavity sealing connector;

[0052] 45. Conical inlet

[0053] 46. ​​Intake converter

[0054] 47. Fiber optic needle sealing bolt;

[0055] 103. Loose sleeve. Detailed Implementation

[0056] To explain in detail the technical content, structural features, objectives, and effects of the technical solution, the following description is provided in conjunction with specific embodiments and accompanying drawings.

[0057] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0058] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0059] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0060] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0061] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0062] In this application, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the stated number; expressions such as "above", "below", and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times", unless otherwise explicitly specified.

[0063] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0064] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0065] Please see Figures 1 to 3 This invention provides a fully dry, bio-resistant optical cable manufacturing device for producing optical cables such as… Figure 3 The optical cable shown is an example. The optical cable includes an optical fiber 6, a water-blocking sheath 4, and a loose tube 103. The water-blocking sheath 4 and the optical fiber 6 are arranged side-by-side in the hollow interior of the loose tube 103. Please refer to [link / reference]. Figure 1and Figure 2 The manufacturing equipment includes an extrusion mold mechanism and an inflation molding mechanism. The extrusion mold mechanism includes a die head 18, a flow divider cone 21, a die core 22, a die cover 23, and a fiber guide needle tube 19. The flow divider cone 21 is used to connect with the sleeve feed port 20. The flow divider cone 21 is installed in the central cone hole of the die head 18. The die core 22 is installed in the flow divider cone 21. The die cover 23 is installed in the central cone hole of the die head 18 and is located outside the die core 22. The die cover 23 and the die core 22 form an annular flow channel communicating with the feed port 20. The raw material in the sleeve feed port 20 forms a loose sleeve at the die cover 23. The fiber guide needle tube 19 is hollow and installed in the center of the die core 22. The front of the fiber guide needle tube 19 is a tapered inlet 45, which can guide the optical fiber 6 and the sleeve water-blocking yarn 4 through. The head of the fiber guide tube 19 is close to the central conical hole of the machine head 18. The inflation forming mechanism includes a fiber guide tube 9, an inflation chamber tube 11, and an air release device 15. The fiber guide tube 9 is a cylindrical structure with a fiber guide hole 40 in the middle. The fiber guide hole 40 is used for the optical fiber 6 and the water-blocking yarn 4 of the sleeve to pass through. The head of the fiber guide tube 9 is airtightly connected to the tail of the fiber guide tube 19. For example, a fiber guide tube sealing bolt 47 can be set at the tail of the fiber guide tube 19, and then the head of the fiber guide tube 9 can be provided with an internal thread. The fiber guide tube sealing bolt 47 is screwed into the internal thread of the head of the fiber guide tube 9 to achieve an airtight connection. The inflation chamber tube 11 is sleeved on the fiber guide tube 9. The head of the inflation chamber tube 11 is connected to the machine head 18. For example, a cavity sealing connector 44 can be set at the head of the inflation chamber tube 11, and an airtight connection can be formed with the tail of the diverter cone 21 through the cavity sealing connector 44. The inflation chamber tube 11 and the fiber guide tube 9 form a flowable inflation cavity 14. The inflation chamber tube 11 has an air inlet 42 and an air vent 43 communicating with the inflation cavity 14. The air vent 43 is equipped with an air venting device 15, which is used to release pressure when the gas pressure is too high, ensuring stable air pressure inside the loose tube. The hollow parts of the fiber guide hole 40 and the fiber guide needle tube 19 of the fiber guide tube 9 are isolated from the gas inside the inflation cavity 14. The air inlet 42 is used to connect to the gas source mechanism. The gas from the air inlet 42 passes through the inflation cavity 14 and then enters the loose tube through the outer side of the fiber guide needle tube 19.

[0066] In use, the present invention first inserts the optical fiber 6 and the water-blocking yarn into the fiber guide tube 9, and pulls them out after passing through the extrusion die head 18. The air inlet 42 is connected to the air source mechanism, and gas is forced into the inflation chamber tube 11, where it forms an airflow path 10. Then, the sleeve feed port 20 is connected to the extruder outlet, and the sleeve material is extruded into the sleeve feed port 20 and extruded by the die head to form a loose tube. The loose tube covers the optical fiber 6 and the water-blocking yarn 4, sealing the frontmost part of the loose tube with the optical fiber 6 and the water-blocking yarn 4. The loose tube is filled with gas to form an optical cable. During the optical cable manufacturing process, an inflation chamber 14 is set on the outside of the fiber guide tube 9, and the head of the fiber guide tube 9 is airtightly connected to the tail of the fiber guide needle tube 19. Thus, the gas from the air inlet 42 passes through the inflation chamber 14 and then enters the loose tube through the outer surface of the fiber guide needle tube 19. Gas is injected onto the outside of the fiber guide tube 19 to prevent significant vibration of the optical fiber 6 and the water-blocking yarn 4. Then, when the loose tube is formed at the mold cover 23, it is filled with gas, ensuring that the optical fiber 6, the water-blocking yarn 4, and the inner wall of the loose tube do not adhere, thus guaranteeing the long-term stability of the transmission performance and excess length of the optical fiber 6. The gas support also ensures the roundness of the loose tube. This solves the problem of unstable excess length and substandard roundness caused by frictional contact due to the lack of grease in all-dry optical cables.

[0067] In some embodiments, a micro dust filter element 16 is included to filter dust from the water-blocking yarn 4 of the fiber guide tube 9. The micro dust filter element 16 is installed on the inner wall of the fiber guide hole 40 of the fiber guide tube 9, and the tail of the fiber guide needle tube 19 presses against the micro dust filter element 16. The micro dust filter element 16 can be made of high-density fiber filter material or porous microstructure material and placed on the inner wall of the fiber guide hole 40 so that it can filter the dust falling from the water-blocking yarn 4 when the optical fiber 6 and the water-blocking yarn 4 pass through, thereby improving the stability of the transmission performance of the optical fiber 6.

[0068] To achieve a stable gas supply, a gas source mechanism is also included. This mechanism comprises compressed air 7, a filter device 1, and a pressure regulating device 2. The compressed air 7 is connected to the inlet of the filter device 1 via a pipe, the outlet of the filter device 1 is connected to the inlet of the pressure regulating device 2, and the outlet of the pressure regulating device 2 is connected to the air inlet 42. This connection can be achieved by installing an air inlet converter 46 at the air inlet 42. This gas source mechanism can provide gas through an industrial compressed air 7 system and achieve a stable gas supply through multi-stage filtration and pressure regulation control. The gas enters the inflation chamber tube 11 through the air inlet 42 and ultimately enters the loose sleeve tube to form a gas support structure. This ensures that the optical fiber 6, the water-blocking yarn 4 of the sleeve, and the inner wall of the loose sleeve tube do not adhere. The pressure regulating device 2 can be a pressure reducing valve to prevent excessive gas pressure.

[0069] Furthermore, the filtration device 1 is an air filtration device 1 and / or a dust filtration device 1; the air filtration device 1 is an air dehumidifier and / or the dust filtration device 1 is a dust collection bag 3 and a micro dust filter element 16. This filtration system can be configured in combination according to the actual production environment. For example, in environments with high humidity, an air dehumidifier or an oil-water separator can be prioritized, while in environments with a lot of dust, a dust collection bag 3 can be used. Through this filtration device 1, the cleanliness and dryness of the gas entering the optical cable can be improved, preventing moisture and dust from adversely affecting the optical fiber 6 and the water-blocking yarn 4 of the sheath, thus solving the problems of moisture intrusion and contamination existing in traditional gas introduction methods.

[0070] To pre-filter dust from the water-blocking yarn 4 in the sleeve, a vacuum cleaner 5 and a dust collection bag 3 are also included. The vacuum cleaner 5 and the dust collection bag 3 are installed outside the inflation forming mechanism and in the path of the water-blocking yarn 4. The vacuum cleaner 5 and the dust collection bag 3 can clean the dust generated by the water-blocking yarn 4 during transportation in real time using negative pressure adsorption. When the water-blocking yarn 4 passes through this area, the negative pressure generated by the vacuum cleaner 5 sucks away impurities adhering to its surface and collects them in the dust collection bag 3, thereby ensuring that the material entering the loose sleeve is in a clean state.

[0071] Furthermore, it also includes a fixed base 13 and a base fixing slide plate 8. The head of the inflation chamber tube 11 is adapted to and sealed to the shoulder of the tail of the fiber guide tube 9. The fixed base 13 is sleeved on the outer side of the inflation chamber tube 11. The fixed connection between the fixed base 13 and the inflation chamber tube 11 can be fixed by fixing bolts 12. The outer side of the fixed base 13 is connected to the base fixing slide plate 8 and can slide freely. The base fixing slide plate 8 is fixedly connected to the machine head 18, such as by fixing it together with the machine head 18 through a base fixing bracket 17. This structure can achieve stable installation and position adjustment of the inflation molding mechanism through mechanical cooperation. The fixed base 13 can be finely adjusted along the direction of the base fixing slide plate 8 to adapt to different working conditions or equipment installation errors. The shoulder sealing structure can be achieved by setting a fiber guide tube connecting bolt 41 on the fiber guide tube 9, and then setting an internal thread on the inner wall of the tail of the inflation chamber tube 11. The airtight connection is achieved by the fiber guide tube connecting bolt 41 and the internal thread. The gas is prevented from leaking through a shoulder sealing structure (such as a threaded and sealing ring structure), while the positional relationship between the fiber guide tube 9 and the machine head 18 is adjusted by a sliding structure (such as a slide rail on the base fixing slide plate 8).

[0072] In some embodiments, the air inlet 42 and the air vent 43 are asymmetrically arranged on the inflation chamber tube 11. The air vent 43 and the venting device 15 are used to release pressure when the gas pressure is too high. Their asymmetrical arrangement prevents the formation of symmetrical vortices in the airflow, thereby improving the uniformity of gas flow within the chamber. During the optical cable manufacturing process, high-pressure gas is discharged through the air vent, maintaining a stable pressure state inside the chamber, which helps to form loose tubes of the same size. This avoids problems such as eccentricity or uneven wall thickness caused by uneven gas pressure during loose tube forming, improving product quality stability.

[0073] Furthermore, the diameter of the air inlet 42 and the air vent 43 is 6mm to 8mm and / or the air venting device 15 includes a silencer air vent valve. This diameter range can be optimized according to gas flow requirements, ensuring inflation efficiency while avoiding excessive airflow causing disturbance. The silencer air vent valve reduces noise in the discharged gas and also provides automatic pressure regulation.

[0074] This invention also provides a method for manufacturing a fully dry, bio-resistant optical cable. The method uses a fully dry, bio-resistant optical cable manufacturing device as described in any one of the present invention, and includes the following steps: inserting the optical fiber 6 and the water-blocking yarn 4 into the fiber guide tube 9, and pulling them out after passing through the extrusion die head 18; connecting the air inlet 42 to the air source mechanism, and pressing the gas into the inflation chamber tube 11; connecting the sleeve inlet 20 to the extruder outlet, extruding the sleeve raw material into the sleeve inlet 20, and extruding it through the die head to form a loose tube, the loose tube covering the optical fiber 6 and the water-blocking yarn 4, sealing the frontmost loose tube and the optical fiber 6 and the water-blocking yarn 4, and filling the loose tube with gas to form an optical cable. In the specific implementation process, firstly, the optical fiber 6 and the water-blocking yarn 4 are introduced into the fiber guide tube 9 and pass through the fiber guide needle tube 19. Simultaneously, the gas source mechanism is activated to deliver clean gas into the inflation chamber. Then, the tube material is conveyed to the die head 18 via an extruder and extruded into a loose tube in the annular flow channel formed by the die core 22 and the die cover 23. Simultaneously, gas enters the loose tube through the outside of the fiber guide needle tube 19, creating a gas-filled state at the moment of forming, encapsulating the optical fiber 6 and the water-blocking yarn 4 within it. This method utilizes gas instead of traditional grease filling to achieve a completely dry structure. Simultaneously, the gas pressure supports the shape of the loose tube, ensuring its stability during extrusion. This effectively avoids the contamination problems caused by traditional grease filling. Furthermore, the internal filling gas ensures that the optical fiber 6, the water-blocking yarn 4, and the inner wall of the loose tube do not adhere, guaranteeing the long-term stability of the optical fiber 6's transmission performance and excess length. The gas support also ensures the roundness of the loose tube. This solves the problems of unstable excess length and substandard roundness caused by frictional contact due to the lack of grease in all-dry optical cables.

[0075] This invention provides a fully dry, bio-infested resistant optical cable, manufactured using the method described herein. The optical cable produced by this invention ensures that the optical fiber 6, the water-blocking yarn 4, and the inner wall of the loose tube dome do not adhere, guaranteeing the long-term stability of the transmission performance and excess length of the optical fiber 6. The gas support also ensures the roundness of the loose tube.

[0076] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present invention. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of the present invention, or equivalent structural or procedural transformations made using the content of the present invention's specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of patent protection of the present invention.

Claims

1. A fully dry, bio-resistant optical cable manufacturing device, characterized in that, include: An extrusion mold mechanism and an inflation molding mechanism are provided. The extrusion mold mechanism includes a die head, a flow divider cone, a die core, a die cover, and a fiber guide needle tube. The flow divider cone is used to connect to the sleeve feed port and is installed in the central cone hole of the die head. The die core is installed in the flow divider cone, and the die cover is installed in the central cone hole of the die head and outside the die core. The die cover and the die core form an annular flow channel communicating with the feed port. The raw material from the sleeve feed port forms a loose sleeve at the die cover. The fiber guide needle tube is hollow and installed in the center of the die core, with its head close to the central cone hole of the die head. The inflation molding mechanism includes a fiber guide tube, an inflation chamber tube, and a deflation device. The tube is a cylindrical structure with a fiber guide hole in the middle, through which optical fibers and water-blocking yarn of the sleeve pass. The head of the fiber guide tube is airtightly connected to the tail of the fiber guide needle tube. The inflation chamber tube is sleeved on the fiber guide tube, and the head of the inflation chamber tube is connected to the machine head. An air-permeable inflation chamber is formed between the inflation chamber tube and the fiber guide tube. The inflation chamber tube has an air inlet and an air vent that communicate with the inflation chamber. The air vent is equipped with an air venting device. The fiber guide hole of the fiber guide tube and the hollow part of the fiber guide needle tube are isolated from the gas in the inflation chamber tube. The air inlet is used to connect to the air source mechanism. The gas in the air inlet passes through the inflation chamber and then enters the loose sleeve tube through the outer side of the fiber guide needle tube.

2. The all-dry, bio-resistant optical cable manufacturing equipment according to claim 1, characterized in that: It also includes a micro dust filter element, which is installed on the inner wall of the fiber guide hole of the fiber guide tube, and the tail of the fiber guide needle tube presses against the micro dust filter element.

3. The all-dry, bio-resistant optical cable manufacturing equipment according to claim 1, characterized in that: It also includes an air source mechanism, which includes compressed air, a filter device and a pressure regulating device. The compressed air is connected to the inlet of the filter device through a pipeline, the outlet of the filter device is connected to the inlet of the pressure regulating device, and the outlet of the pressure regulating device is connected to the air inlet.

4. The all-dry, bio-resistant optical cable manufacturing equipment according to claim 3, characterized in that: The filtration device is an air filtration device and / or a dust filtration device; the air filtration device is an air dehumidifier and / or the dust filtration device is a dust collection bag and a micro dust filter element.

5. The all-dry, bio-resistant optical cable manufacturing equipment according to claim 1, characterized in that: It also includes a vacuum cleaner and a dust collection bag, which are mounted on the outside of the inflatable forming mechanism and in the travel path of the water-blocking yarn in the sleeve.

6. The all-dry, bio-resistant optical cable manufacturing equipment according to claim 1, characterized in that: It also includes a fixed base and a base fixing slide plate. The head of the inflation chamber tube is adapted to and sealed to the shoulder of the fiber guide tube. The fixed base is sleeved on the outer side of the inflation chamber tube. The outer side of the fixed base is connected to the base fixing slide plate and can slide freely. The base fixing slide plate is fixedly connected to the machine head.

7. The all-dry, bio-resistant optical cable manufacturing equipment according to claim 1, characterized in that: The air inlet and air outlet are asymmetrically arranged on the inflation chamber tube.

8. The all-dry, bio-resistant optical cable manufacturing equipment according to claim 1, characterized in that: The diameter of the air inlet and vent is 6mm-8mm and / or the venting device includes a silencer venting valve.

9. A method for manufacturing a fully dry, bio-resistant optical cable, characterized in that, The manufacturing method employs the all-dry, bio-resistant optical cable manufacturing equipment described in any one of claims 1 to 8, and includes the following steps: The optical fiber and the water-blocking yarn in the sleeve are inserted into the fiber guide tube and pulled out after passing through the extrusion die head; Connect the air inlet to the air source mechanism to pressurize the gas into the inflation chamber tube; Connect the tube inlet to the extruder outlet, squeeze the tube raw material into the tube inlet, and extrude it through the die head to form a loose tube. The loose tube covers the optical fiber and the water-blocking yarn of the tube. Seal the frontmost loose tube, the optical fiber and the water-blocking yarn of the tube, and fill the loose tube with gas to form an optical cable.

10. A fully dry, bio-infestation-resistant optical cable, characterized in that, The optical cable is manufactured by the method for producing a fully dry, bio-resistant optical cable as described in claim 9.

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