Inner mold assembly and optical cable production mold

Abstract

The utility model provides a kind of inner mould component and optical cable production mould, solve the vacuumizing device and head connection, the vacuum degree in mould is smaller, leading to the pulling force of optical cable smaller problem.The inner mould component includes inner mould, first vacuum pipe and second vacuum pipe, and the inner mould is inserted into outer mould, and extrusion cavity is formed between the inner mould and outer mould, and the inner mould is provided with optical fiber hole position for optical fiber passing, and reinforcing member hole position for reinforcing member passing, and optical fiber hole position and reinforcing member hole position are all communicated with extrusion cavity;First vacuum pipe is fixedly connected with optical fiber hole position and is communicated, and second vacuum pipe is fixedly connected with reinforcing member hole position and is communicated, and first vacuum pipe and second vacuum pipe are communicated with vacuumizing device by air pipe.The space in first vacuum pipe and second vacuum pipe is more narrow, to improve the vacuum degree in mould, outer sheath is tightly wrapped around reinforcing member and optical fiber under the action of negative pressure in forming process, to improve the pulling force of optical cable, prolong the service life of optical cable.

Description

Technical Field

[0001] This utility model relates to the field of optical cable mold technology, and in particular to an inner mold component and an optical cable production mold. Background Technology

[0002] With the increasing prevalence of outdoor aerial optical cables, their application scenarios are becoming more diversified. Optical cable pull-out force refers to the force required to pull the outer sheath of the optical cable out from a certain length under specific conditions, such as after stripping a section of the outer sheath (e.g., 10 cm). This parameter is crucial for the installation and maintenance of optical cables, as it directly affects the operability and reliability during construction. If the pull-out force is insufficient, the outer sheath is prone to relative displacement between the outer and inner optical fibers during outdoor aerial use, impacting the cable's lifespan.

[0003] Existing optical cable molds include an outer mold and an inner mold, with an extrusion cavity between them. A conductive cavity is formed between the extrusion cavity and the outlet of the inner mold. Optical fibers and reinforcing members pass through the inner mold, and the material of the outer sheath is extruded from the cavity between the outer and inner molds. Within the conductive cavity, the outer sheath wraps around the optical fibers and reinforcing members, thus forming the optical cable. To ensure the outer sheath tightly wraps around the optical fibers and reinforcing members, i.e., to increase the pull-out force of the optical cable, existing technologies use a vacuum pump connected to the die head that fixes the mold, evacuating the die head and thus creating a vacuum inside the mold.

[0004] The applicant has discovered that the existing technology suffers from at least the following technical problems: The connection between the vacuum device and the die head is difficult to guarantee a high degree of airtightness, resulting in insufficient vacuum. Furthermore, the large internal space of the die head leads to a long time required for vacuuming the mold, resulting in low vacuuming efficiency. Because the die head is constantly exposed to high-temperature extrusion, prolonged use can cause aging due to high temperatures or wear on the die head threads due to forceful disassembly, necessitating frequent die head replacements. These factors result in low pull-out force for the optical cable, affecting its service life. To improve the long-term service life of optical cables, the requirements for pull-out force and hardware tensile testing of existing outdoor optical cables are becoming increasingly stringent, necessitating the development of a production mold that increases the pull-out force of the optical cable. Utility Model Content

[0005] The purpose of this invention is to provide an inner mold assembly and an optical cable production mold to solve the technical problem in the prior art where the vacuuming device connected to the machine head creates a low vacuum inside the mold, resulting in a weak wrapping force of the outer sheath on the optical fiber and consequently a weak pull-out force for the optical cable. The various technical effects of the preferred solutions provided by this invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The inner mold assembly provided by this utility model is characterized by comprising an inner mold, a first vacuum tube, and a second vacuum tube, wherein:

[0008] The inner mold is inserted into the outer mold, and an extrusion cavity is formed between them. The inner mold is provided with fiber optic holes for optical fibers to pass through and reinforcing holes for reinforcing members to pass through. The fiber optic holes and the reinforcing holes are both connected to the extrusion cavity.

[0009] The first vacuum tube is fixedly connected to and communicates with the optical fiber hole, the second vacuum tube is fixedly connected to and communicates with the reinforcing member hole, and the first vacuum tube and the second vacuum tube are connected to the vacuum pumping device through an air pipe.

[0010] Preferably, both the first vacuum tube and the second vacuum tube are provided with air guide holes, which penetrate one side wall of the corresponding vacuum tube. The air guide holes are connected to the vacuum pumping device through air pipes, so that the vacuum pumping device can evacuate each of the first vacuum tube and the second vacuum tube individually.

[0011] Preferably, the inner mold includes an insertion part, which is a conical structure and is inserted into the conical groove of the outer mold. The inner cavity of the conical structure is a conical cavity, and the narrow end of the conical structure is provided with an optical fiber bearing tube and a reinforcing bearing tube, wherein:

[0012] The cavity of the optical fiber bearing tube serves as the optical fiber hole, and the cavity of the reinforcing member bearing tube serves as the reinforcing member hole.

[0013] The optical fiber bearing tube and the reinforcing bearing tube protrude from the inner end face of the narrow end of the tapered structure. The optical fiber bearing tube is detachably and fixedly connected to the first vacuum tube, and the reinforcing bearing tube is detachably and fixedly connected to the second vacuum tube.

[0014] Preferably, the reinforcing member bearing tube is arranged around the optical fiber bearing tube.

[0015] Preferably, the fiber optic bearing tube is threadedly connected to the first vacuum tube, and the reinforcing bearing tube is threadedly connected to the second vacuum tube.

[0016] Preferably, the optical fiber bearing tube protrudes from the outer end face of the narrow end of the tapered structure and extends into the extrusion cavity;

[0017] The optical fiber bearing tube and the forming holes of the outer mold are arranged coaxially, and the axis of the reinforcing bearing tube is arranged parallel to the axis of the optical fiber bearing tube.

[0018] Preferably, the inner mold includes an inner ring body with a connecting hole. A locking member passes through the connecting hole to fix the inner mold to the outer mold. A gasket is provided on the outer sleeve of the locking member, and the gasket is clamped and fixed between the inner mold and the outer mold.

[0019] Preferably, the disc body is provided with a slot for engaging and positioning with the machine head.

[0020] This utility model also provides an optical cable production mold, including an outer mold and the aforementioned inner mold assembly, wherein:

[0021] The outer mold is fixedly connected to the inner mold. The outer mold is provided with forming holes, which are connected to the discharge ends of the optical fiber holes and the reinforcing member holes.

[0022] Preferably, a conical groove is formed inside the outer mold, a portion of the inner mold is inserted into the conical groove, and the extrusion cavity is formed between the outer wall of the inner mold and the side wall of the conical groove;

[0023] The outer mold includes an outer ring body and a protrusion. The outer ring body and the protrusion are fixedly connected or integrally formed. The outer ring body is detachably fixedly connected to the inner mold. The forming hole passes through both ends of the protrusion.

[0024] The extrusion chamber includes a conductive cavity, which is formed between the discharge end of the optical fiber hole and the reinforcing member hole and the feed end of the forming hole.

[0025] Compared with the prior art, the inner mold assembly and optical cable production mold provided by this utility model have the following beneficial effects: The inner mold assembly is used in conjunction with the outer mold. The vacuum pumping device is connected to the first and second vacuum tubes. Since the internal space of each vacuum tube is smaller than the internal space of the vacuum pumping head, the space of the first and second vacuum tubes is narrower when the same number of vacuum pumps are used, which can increase the vacuum level in the mold in a shorter time. Furthermore, it is easier to ensure airtightness when the vacuum tubes are connected to the vacuum pumping device. During the molding process, the outer sheath is tightly wrapped around the reinforcing member and optical fiber under negative pressure, preventing gaps between the outer sheath and the optical fiber, and between the outer sheath and the reinforcing member. This improves the pull-out force of the optical cable, greatly enhances the performance of the optical cable tensile test and overhead test, and extends the service life of the optical cable. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the optical cable production mold;

[0028] Figure 2 This is an axial cross-sectional view of the optical cable production mold;

[0029] Figure 3 This is a structural schematic diagram of the inner mold from one perspective;

[0030] Figure 4 This is a structural schematic diagram of the inner mold from another perspective;

[0031] Figure 5 This is a schematic diagram of the structure of the first vacuum tube;

[0032] Figure 6 This is a structural schematic diagram of the inner mold component from one perspective;

[0033] Figure 7 This is a structural schematic diagram of the inner mold component from another perspective;

[0034] Figure 8 This is a structural diagram of the outer mold.

[0035] In the diagram: 100, extrusion chamber; 101, conduction chamber; 1, inner mold; 11, insertion part; 12, inner ring body; 121, connecting hole; 122, slot; 13, fiber optic bearing tube; 131, fiber optic hole; 14, reinforcing bearing tube; 141, reinforcing hole; 2, first vacuum tube; 21, internal thread; 3, second vacuum tube; 4, air guide hole; 5, outer mold; 51, outer ring body; 52, protrusion; 53, forming hole; 501, pin hole; 6, gasket. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] In the description of this utility model, it should be understood that the terms "center," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0038] Existing optical cable molds include an outer mold and an inner mold, with an extrusion cavity between them. A conductive cavity is formed between the extrusion cavity and the outlet of the inner mold. Optical fibers and reinforcing members pass through the inner mold, and the material of the outer sheath is extruded from the cavity between the outer and inner molds. Within the conductive cavity, the outer sheath wraps around the optical fibers and reinforcing members, thus forming the optical cable. To ensure the outer sheath tightly wraps around the optical fibers and reinforcing members, i.e., to increase the pull-out force of the optical cable, existing technologies use a vacuum pump connected to the die head that fixes the mold, evacuating the die head and thus creating a vacuum within the mold. However, the connection between the vacuum pump and the die head is difficult to guarantee high airtightness, resulting in insufficient vacuum. Furthermore, the large internal space of the die head leads to a long time required for vacuuming the mold, resulting in low vacuuming efficiency. Because the die head is constantly exposed to high-temperature extrusion, it may age due to high temperatures or wear on the threads from forceful disassembly, requiring frequent die head replacement. These factors result in a relatively low pull-out force for the optical cable, affecting its service life. In order to improve the long-term service life of optical cables, the requirements for the pull-out force of existing outdoor optical cables and the tensile test of fittings are becoming increasingly stringent, and it is necessary to develop a production mold that can increase the pull-out force of optical cables.

[0039] To address the aforementioned problems, this utility model provides an inner mold component and an optical cable production mold, which can improve the pull-out force of the optical cable, significantly enhance the performance of tensile and overhead tests, and extend the service life of the optical cable.

[0040] The following is combined Figures 1-8 The technical solution provided by this utility model will be described in more detail.

[0041] Example 1:

[0042] like Figures 1-7As shown, the inner mold assembly provided by this utility model includes an inner mold 1, a first vacuum tube 2, and a second vacuum tube 3. The inner mold 1 is inserted into the outer mold 5, forming a compression cavity 100 between them. The inner mold 1 is provided with an optical fiber hole 131 for optical fiber to pass through and a reinforcing member hole 141 for reinforcing member to pass through. Both the optical fiber hole 131 and the reinforcing member hole 141 are connected to the compression cavity 100. The first vacuum tube 2 is fixedly connected to and communicates with the optical fiber hole 131, and the second vacuum tube 3 is fixedly connected to and communicates with the reinforcing member hole 141. The first vacuum tube 2 and the second vacuum tube 3 are connected to a vacuum pumping device through air pipes.

[0043] For details, see Figure 1 and Figure 2 As shown, Figure 2 The solid arrows indicate the direction of material movement during the extrusion molding of the outer sheath in the optical cable manufacturing process, while the hollow arrows indicate the feeding direction of the optical fiber and reinforcing components.

[0044] In the prior art, an extrusion cavity 100 is formed between the outer mold 5 and the inner mold 1. The outer mold 5 has forming holes 53. The outer sheath material exits from the extrusion cavity 100 to the forming holes 53 of the outer mold 5. A vacuum is drawn from the die head, i.e., a vacuum is drawn inside the mold. The outer sheath material mixes with the optical fiber and reinforcing member in the front cavity of the forming holes 53. Under negative pressure, the outer sheath wraps around the optical fiber and reinforcing member. As described in the background art, a vacuum device is used connected to the die head with the fixed mold to draw a vacuum at the die head, thereby drawing a vacuum inside the mold. However, the connection between the vacuum device and the die head makes it difficult to guarantee high airtightness, resulting in insufficient vacuum. Furthermore, the large internal space of the die head makes vacuuming the mold time-consuming and inefficient. Since the die head is exposed to high-temperature extrusion environments for extended periods, the threads of the die head may wear due to aging caused by high temperatures or forceful disassembly, requiring frequent replacement of the die head.

[0045] Therefore, in this embodiment, the vacuum pumping device is connected to the first vacuum tube 2 and the second vacuum tube 3. Since the internal space of each vacuum tube is smaller than the internal space of the vacuum pumping head, when the same number of vacuum pumps are used for pumping, the pipe space of the first vacuum tube 2 and the second vacuum tube 3 is narrower, which can increase the vacuum level in the mold in a shorter time. Moreover, it is easier to ensure airtightness when the vacuum tubes are connected to the vacuum pumping device. During the molding process, the outer sheath is tightly wrapped around the reinforcing member and optical fiber under negative pressure, preventing gaps between the outer sheath and the optical fiber, and between the outer sheath and the reinforcing member. This improves the pull-out force of the optical cable, greatly improves the performance of the optical cable tensile test and overhead test, and extends the service life of the optical cable.

[0046] The vacuuming device can be a vacuum pump. A vacuum pump can provide suction or blowing. Suction can increase the pull-out force of the optical cable reinforcement or optical fiber; blowing will reduce the pull-out force between the optical fiber or reinforcement and the sheath.

[0047] As an alternative implementation, see [link to implementation details]. Figure 2 and Figure 6 As shown, in this embodiment, both the first vacuum tube 2 and the second vacuum tube 3 are provided with air guide holes 4. The air guide holes 4 penetrate one side wall of the corresponding vacuum tube. The air guide holes 4 are connected to the vacuum pumping device through air pipes, so that the vacuum pumping device can pump a vacuum on each of the first vacuum tube 2 and the second vacuum tube 3 individually.

[0048] Since each of the first vacuum tube 2 and the second vacuum tube 3 is equipped with a separate air guide hole 4, vacuuming can be performed separately for each hole position corresponding to the reinforcing member and optical fiber according to different types of optical cables, so as to better meet the extraction force requirements of different components of the optical cable.

[0049] As an alternative implementation, see [link to implementation details]. Figure 2 and Figure 6 As shown, the inner mold 1 includes an insertion part 11, which is a conical structure and is inserted into the conical groove of the outer mold 5. The inner cavity of the conical structure is a conical cavity, and the extrusion cavity 100 is formed between the insertion part 11 and the groove wall of the conical groove. See also Figure 3 and Figure 4 As shown, the narrow end of the tapered structure is provided with an optical fiber support tube 13 and a reinforcing support tube 14, wherein: the cavity of the optical fiber support tube 13 serves as an optical fiber aperture 131, and the cavity of the reinforcing support tube 14 serves as a reinforcing aperture 141; the optical fiber support tube 13 and the reinforcing support tube 14 protrude from the inner end face of the narrow end of the tapered structure, see [reference]. Figure 6 and Figure 7 As shown, the fiber optic support tube 13 is detachably and fixedly connected to the first vacuum tube 2, and the reinforcing support tube 14 is detachably and fixedly connected to the second vacuum tube 3.

[0050] The fiber optic bearing tube 13 is used to be screwed and externally connected to the first vacuum tube 2, and the fiber optic cable enters the mold from here; the reinforcing bearing tube 14 is used to be screwed and externally connected to the second vacuum tube 3, and the reinforcing cable enters the mold from here.

[0051] The optical fiber and the reinforcing member pass through the corresponding optical fiber hole 131 and reinforcing member hole 141, respectively, to facilitate the positioning and shaping of the optical fiber and the reinforcing member within the outer sheath. The reinforcing member can be an aramid yarn reinforcing member, the purpose of which is to improve the structural strength of the optical cable.

[0052] The insertion part 11 has a conical structure, which facilitates its cooperation with the outer mold 5 to form the extrusion cavity 100, thus facilitating the extrusion molding of the outer sheath. The fiber optic support tube 13 and the reinforcing support tube 14 protrude from the inner end face of the narrow end of the conical structure, facilitating the detachable and fixed connection between the fiber optic support tube 13 and the first vacuum tube 2, and between the reinforcing support tube 14 and the second vacuum tube 3. The inner end face of the narrow end of the conical structure refers to the side of the conical structure facing away from the outer mold 5.

[0053] As an alternative implementation, see [link to implementation details]. Figure 6 As shown, the reinforcing member bearing tube 14 is arranged around the optical fiber bearing tube 13.

[0054] The number of reinforcing bearing tubes 14 is unlimited. The radial cross-section of the reinforcing bearing tubes 14 and the optical fiber bearing tubes 13 can be circular, elliptical, or square, etc., without any specific limitation.

[0055] As an optional implementation, the optical fiber bearing tube 13 is threadedly connected to the first vacuum tube 2, and the reinforcing bearing tube 14 is threadedly connected to the second vacuum tube 3.

[0056] For details, see Figure 5 As shown, the first vacuum tube 2 in this embodiment has an internal thread 21 at its connecting end for threaded connection with the optical fiber bearing tube 13. Similarly, the second vacuum tube 3 has an internal thread at its connecting end for threaded connection with the reinforcing member bearing tube 14. The sizes of the first vacuum tube 2 and the second vacuum tube 3 are determined according to the size of the optical fiber hole 131 and the reinforcing member hole 141. The inner diameter of the first vacuum tube 2 is slightly larger than the diameter of the optical fiber hole 131, and the inner diameter of the second vacuum tube 3 is slightly larger than the diameter of the reinforcing member hole 141.

[0057] As an alternative implementation, see [link to implementation details]. Figure 2 and Figure 6 As shown, the fiber optic cable holder 13 protrudes from the outer end face of the narrow end of the tapered structure and extends into the extrusion cavity 100, facilitating the tight wrapping of the optical fiber by the outer sheath material; see also Figure 2 As shown, the optical fiber bearing tube 13 and the forming hole 53 of the outer mold 5 are arranged coaxially, and the axis of the reinforcing bearing tube 14 is arranged parallel to the axis of the optical fiber bearing tube 13.

[0058] The above structure facilitates the formation of optical fibers on the central axis of the outer sheath, better protects the internal optical fibers, and makes it easier for the reinforcing members to be evenly distributed inside the optical cable.

[0059] As an alternative implementation, see [link to implementation details]. Figure 2 , Figure 3 , Figure 4As shown, the inner mold 1 includes an inner ring body 12, on which a connecting hole 121 is provided. A locking member passes through the connecting hole 121 to fix the inner mold 1 and the outer mold 5. A gasket 6 is provided on the outer sleeve of the locking member, and the gasket 6 is clamped and fixed between the inner mold 1 and the outer mold 5.

[0060] The locking element can be a pin, etc. The inner ring 12 facilitates the fixed connection between the inner mold 1 and the outer mold 5. The locking element passes through the gasket 6 and is used to adjust the die spacing between the outer mold 5 and the inner mold 1, thereby adjusting the width of the extrusion cavity 100.

[0061] As an alternative implementation, see [link to implementation details]. Figure 3 , Figure 4 As shown, the disc body is provided with a slot 122 for engaging and positioning with the die head. The slot 122 is used to engage with the die head of the extruder to fix the die and prevent the die from rotating in the extruder.

[0062] Example 2:

[0063] This embodiment provides an optical cable production mold, see [link]. Figure 1 and Figure 2 As shown, it includes an outer mold 5 and the aforementioned inner mold assembly, wherein: the outer mold 5 is fixedly connected to the inner mold 1, and the outer mold 5 is provided with a forming hole 53, which is connected to the discharge end of the fiber optic hole 131 and the reinforcing member hole 141.

[0064] As an optional implementation, see Figure 2 As shown, a conical groove is formed inside the outer mold 5, a portion of the inner mold 1 is inserted into the conical groove, and the extrusion cavity 100 is formed between the outer wall of the inner mold 1 and the side wall of the conical groove; see also Figure 8 As shown, the outer mold 5 includes an outer ring body 51 and a protrusion 52. The outer ring body 51 and the protrusion 52 are fixedly connected or integrally formed. The outer ring body 51 is detachably fixedly connected to the inner mold 1. (See also...) Figure 8 As shown, the outer ring body 51 is provided with a pin hole 501 that mates with the connecting hole 121. The gasket 6 is clamped between the outer ring body 51 and the inner ring body 12. The locking member passes through the pin hole 501, the gasket 6 and the connecting hole 121 to fix the inner mold and the outer mold in place. The forming hole 53 passes through both ends of the protrusion 52. The extrusion chamber 100 includes a conductive cavity 101, which is formed between the discharge end of the optical fiber hole 131 and the reinforcing member hole 141 and the feed end of the forming hole 53.

[0065] Based on the above-described device, the optical cable extraction force can be increased or decreased, and the extraction can be controlled individually for each component. First, the mold is loaded into the extruder head. After the extruder is heated, the threaded side of the first vacuum tube 2 is connected to the optical fiber receiving tube 13, and the threaded side of the second vacuum tube 3 is connected to the reinforcing member receiving tube 14. Then, one side of the air tube is connected to the air guide hole 4 on the first vacuum tube 2 and the second vacuum tube 3, and the other side of the air tube is inserted into a vacuum pump, or an air suction machine or an air blower. The optical fiber and the reinforcing member are fed into the first vacuum tube 2 and the second vacuum tube 3 in sequence, thus completing the installation, and the optical cable can be directly manufactured.

[0066] See Figure 2 As shown, the outer sheath material exits from the extrusion chamber 100 to the forming hole 53 of the outer mold 5. The optical fiber enters the mold from the first vacuum tube 2 and the optical fiber bearing tube 13. The reinforcing member enters the mold from the second vacuum tube 3 and the reinforcing member bearing tube 14. At the conductive cavity 101, the outer sheath material mixes with the optical fiber and the reinforcing member. As it enters the forming hole 53 in the next step, under the action of negative pressure, the outer sheath material tightly wraps around the optical fiber and the reinforcing member, and is extruded after passing through the forming hole 53.

[0067] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An inner mold assembly comprising: Includes an inner mold, a first vacuum tube, and a second vacuum tube, wherein: The inner mold is inserted into the outer mold, and an extrusion cavity is formed between them. The inner mold is provided with fiber optic holes for optical fibers to pass through and reinforcing holes for reinforcing members to pass through. The fiber optic holes and the reinforcing holes are both connected to the extrusion cavity. The first vacuum tube is fixedly connected to and communicates with the optical fiber hole, the second vacuum tube is fixedly connected to and communicates with the reinforcing member hole, and the first vacuum tube and the second vacuum tube are connected to the vacuum pumping device through an air pipe.

2. The inner mold assembly of claim 1, wherein, Both the first vacuum tube and the second vacuum tube are provided with air guide holes. The air guide holes penetrate one side wall of the corresponding vacuum tube. The air guide holes are connected to the vacuum pumping device through air pipes, so that the vacuum pumping device can evacuate each of the first vacuum tube and the second vacuum tube individually.

3. The inner mold assembly of claim 1, wherein, The inner mold includes an insertion part, which is a conical structure and is inserted into the conical groove of the outer mold. The inner cavity of the conical structure is a conical cavity. The narrow end of the conical structure is provided with an optical fiber bearing tube and a reinforcing bearing tube, wherein: The cavity of the optical fiber bearing tube serves as the optical fiber hole, and the cavity of the reinforcing member bearing tube serves as the reinforcing member hole. The optical fiber bearing tube and the reinforcing bearing tube protrude from the inner end face of the narrow end of the tapered structure. The optical fiber bearing tube is detachably and fixedly connected to the first vacuum tube, and the reinforcing bearing tube is detachably and fixedly connected to the second vacuum tube.

4. The inner mold assembly of claim 3, wherein, The reinforcing member bearing tube is arranged around the optical fiber bearing tube.

5. The inner mold assembly of claim 3, wherein, The optical fiber bearing tube is threadedly connected to the first vacuum tube, and the reinforcing bearing tube is threadedly connected to the second vacuum tube.

6. The inner mold assembly of claim 3, wherein, The optical fiber bearing tube protrudes from the outer end face of the narrow end of the tapered structure and extends into the extrusion cavity; The optical fiber bearing tube and the forming holes of the outer mold are arranged coaxially, and the axis of the reinforcing bearing tube is arranged parallel to the axis of the optical fiber bearing tube.

7. The inner mold assembly of claim 1, wherein, The inner mold includes an inner ring body with a connecting hole. A locking member passes through the connecting hole to fix the inner mold to the outer mold. A gasket is provided on the outer sleeve of the locking member, and the gasket is clamped and fixed between the inner mold and the outer mold.

8. The inner mold assembly of claim 7, wherein, The disc body is provided with a slot for engaging and positioning with the machine head.

9. An optical cable production mold characterized by, Includes an outer mold and an inner mold assembly as described in any one of claims 1-8, wherein: The outer mold is fixedly connected to the inner mold. The outer mold is provided with forming holes, which are connected to the discharge ends of the optical fiber holes and the reinforcing member holes.

10. The optical cable production die of claim 9, wherein, A conical groove is formed inside the outer mold, a portion of the inner mold is inserted into the conical groove, and the extrusion cavity is formed between the outer wall of the inner mold and the side wall of the conical groove; The outer mold includes an outer ring body and a protrusion. The outer ring body and the protrusion are fixedly connected or integrally formed. The outer ring body is detachably fixedly connected to the inner mold. The forming hole passes through both ends of the protrusion. The extrusion chamber includes a conductive cavity, which is formed between the discharge end of the optical fiber hole and the reinforcing member hole and the feed end of the forming hole.

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