WO2020134182A1

WO2020134182A1 - Fully-dry optical cable loose sleeve production process and shaping apparatus thereof

Info

Publication number: WO2020134182A1
Application number: PCT/CN2019/104964
Authority: WO
Inventors: 韩宇峰; 刘沛东; 史惠萍; 吴迪; 周峰; 费华青; 李伟; 王宇亮
Original assignee: 江苏亨通光电股份有限公司
Priority date: 2018-12-25
Filing date: 2019-09-09
Publication date: 2020-07-02
Also published as: CN109693359A; CA3067014A1; BR112020007659A2

Abstract

Provided in the present disclosure are a fully-dry optical cable loose sleeve production process and a shaping apparatus thereof, relating to the technical field of optical fibre cable processing and manufacturing, the fully-dry optical cable loose sleeve production process of the present disclosure comprising: by means of a loose sleeve shaping apparatus, extruding loose sleeve material into a tubular loose sleeve; filling the loose sleeve with compressed gas; cooling the loose sleeve; and inserting optical fibre or optical fibre ribbon into the loose sleeve. The fully-dry optical cable loose sleeve production process provided in the present disclosure solves the technical problems in the prior art of the loose sleeve easily becoming flat when extruded and the optical fibre easily sticking to the loose sleeve, such that the optical fibre attenuation index does not meet standards.

Description

Production process of full-dry optical cable loose tube and its forming device

Cross-reference of related applications

This disclosure requires the priority of the Chinese patent application filed on December 25, 2018 with the application number 201811596468.6 and the title of "Full Dry Optical Cable Loose Tube Production Process and its Forming Device".

Technical field

The present disclosure relates to the technical field of optical fiber and cable processing and manufacturing, and in particular, to a production process of a full-dry optical fiber cable loose tube and its forming device.

Background technique

At present, the loose tube in the optical cable mainly uses the oil-filled type, that is, the ointment is filled in the loose tube to protect the optical fiber and ensure that the loose tube of the optical fiber does not seep; when the loose tube is formed, the filled ointment also serves to loosen the sleeve The role of tube support roundness.

As an ointment-free optical cable, the all-dry optical cable eliminates the process of removing ointment during construction, improves the construction efficiency, and also avoids environmental pollution. It is an environmentally friendly outdoor optical cable. The loose tube in the fully dry optical cable is easy to be flat when extruded, and the optical fiber is easy to stick with the loose tube, which causes the fiber attenuation index to be unqualified.

Summary of the invention

The purpose of the present disclosure includes, for example, to provide a production process of a loose tube loose tube of optical fiber to relieve the loose tube in the related art from being flat when extruded, and the optical fiber is easily stuck to the loose tube, resulting in the optical fiber The technical problem of unqualified attenuation index.

The purpose of the present disclosure also includes, for example, providing a full-dry optical fiber cable loose tube forming device to alleviate that the loose tube in the related art tends to be flat when extruded, and the optical fiber is easily stuck to the loose tube, resulting in The technical problem of unqualified optical fiber attenuation index.

The embodiments of the present disclosure are implemented as follows:

The production process of the loose tube of the full-dry optical cable provided by the embodiment of the present disclosure includes:

The loose tube material is extruded into a tubular loose tube by the loose tube forming device;

Fill the loose tube with compressed gas;

Cool the loose tube;

Pass the optical fiber or optical fiber ribbon into the loose tube.

Fill the lumen of the loose tube in the extrusion process with compressed gas.

Optionally, the formed loose tube is cooled.

Optional, the production process of loose tube of full-dry optical cable also includes:

Pass the fiber or light into the lumen of the loose tube.

Optionally, the process steps of filling the lumen of the loose tube with compressed gas include:

Purify and dehumidify the compressed gas, fill the loose tube through the gas storage tank and flow controller.

Optionally, the process steps of cooling the loose tube include:

Make the loose tube wind around the main wheel traction after passing through the first cooling slot;

Unwind the loose tube around the main wheel traction and pass through the second cooling slot and auxiliary traction;

Put the loose tube into the wire take-up device and collect it on the wire reel of the wire take-up device.

An embodiment of the present disclosure also provides a full-dry optical fiber cable loose tube forming device, including: a machine head, a mold core and a mold sleeve, the machine head is provided with a vent hole, the mold core is installed on the machine head, and the mold core is provided with a mold core The through hole, the through hole of the mold core communicates with the vent hole; the mold sleeve is sleeved on the outer periphery of the mold core, and forms a molding space with the mold core, and the molding space communicates with the outside.

Optionally, the mold core includes a first tapered section and a first cylindrical section, the first cylindrical section is connected to the end of the first tapered section with a smaller inner diameter; the mold sleeve includes a second tapered section and a second column Shaped section, the second cylindrical section is connected to the end with the smaller inner diameter of the second tapered section;

The second tapered section is sleeved on the outer circumference of the first tapered section and the two define a tapered space, and the second cylindrical section is sleeved on the outer circumference of the first cylindrical section and the two define a cylindrical space, the tapered The space communicates with the cylindrical space and constitutes a molding space.

Optionally, the mold core further includes a plug-in section, the plug-in section is connected to the end of the first tapered section away from the first cylindrical section, and the through hole of the mold core sequentially penetrates the plug-in section, the first tapered section, and the first column Shaped section; the insertion section is inserted into the vent hole.

Optionally, the molding device further includes an inflatable base mounted on the machine head, the inflatable base is provided with an inflation inlet and an air delivery hole, and the air delivery hole communicates with the inflation inlet and the ventilation hole, respectively.

Optionally, the inflation inlet is provided on the side wall of the inflation base, and the gas delivery hole penetrates the inflation base along the length direction of the inflation base.

Optionally, the outer circumferential surface of the inflatable base is provided with an annular sealing protrusion, the inflatable base has an insertion portion, the insertion portion is inserted into the vent hole, and the annular sealing protrusion abuts against the outer wall of the handpiece.

Optionally, the full dry optical cable loose tube forming device further includes a pressure ring, the pressure ring is sleeved outside the inflatable base, the pressure ring is connected with the machine head, and the ring-shaped sealing protrusion is clamped between the pressure ring and the machine head.

Optionally, the full-dry optical fiber cable loose tube forming device further includes a sealing gasket, which is located between the inflatable base and the handpiece, and is configured to seal the connection position of the inflatable base and the handpiece.

Optionally, a pressure relief valve is installed on the inflatable base, and the pressure relief valve is in communication with the air delivery hole.

Optionally, the forming device further includes a fiber guide mechanism, the fiber guide mechanism is connected to the machine head, and the inside of the fiber guide mechanism communicates with the through hole of the mold core.

Optionally, the optical fiber guide mechanism includes a needle base and a guide assembly. The needle base is installed on the machine head, and the needle base is provided with a guide through hole communicating with the through hole of the core; the guide assembly is installed in the guide through hole.

Optionally, the needle base is located in the air hole, there is a gap between the outer wall of the needle base and the inner wall of the air hole, and one end of the needle base is inserted into the through hole of the mold core, between the needle base and the inner wall of the through hole of the core There is a gap so that the air delivery hole, the vent hole, and the mold core through hole communicate in sequence.

Optionally, the needle base includes a connected connecting portion and a guide portion, the guide through hole penetrates the connecting portion and the guide portion in sequence, the guide portion passes through the gas delivery hole and is inserted into the mold core through hole, and the connecting portion is connected to the inflation base.

Optionally, the guide assembly includes a first fiber guide needle tube and a second fiber guide needle tube, the first fiber guide needle tube is installed at the first end of the needle tube holder, and the second fiber guide needle tube is installed at the second end of the needle tube holder;

The first fiber guide needle tube is provided with a first fiber guide hole, the second fiber guide needle tube is provided with a second fiber guide hole, and both the first fiber guide hole and the second fiber guide hole are in communication with the guide through hole.

Compared with the prior art, the beneficial effects of the embodiments of the present disclosure include, for example:

The production process of a full-dry optical cable loose tube and its forming device provided by the present disclosure, the production process of a full-dry optical cable loose tube include: extruding the loose tube material into a tubular loose tube through the loose tube forming device ; Fill the loose tube with compressed gas; Cool the loose tube; Pass the fiber or optical fiber into the loose tube. The compressed gas is supported inside the loose tube, so that the outer diameter of the loose tube is not affected by the fluctuation of the gas pressure. The outer diameter of the loose tube is round and smooth, and can ensure that the loose tube forms a reasonable fiber excess length. Optical fiber transmission performance The fiber length is stable and the attenuation index is good.

BRIEF DESCRIPTION

In order to more clearly explain the specific embodiments of the present disclosure or the technical solutions in the related art, the following will briefly introduce the drawings used in the description of the specific embodiments or the related technology. Obviously, the drawings in the following description are Some embodiments of the present disclosure, for those of ordinary skill in the art, can also obtain other drawings according to these drawings without creative efforts.

1 is a cross-sectional view of a full-dry optical cable loose tube forming device provided by the present disclosure;

FIG. 2 is a partially enlarged schematic diagram of FIG. 1.

Icon: 100-handpiece; 101-vent; 200-die core; 201-die core through-hole; 210-plug section; 220-first tapered section; 230-first cylindrical section; 300-die sleeve 310-Second conical section; 320-Second cylindrical section; 400-Inflatable base; 410-Inflatable inlet; 411-Air port; 420-Relief valve; 430-Locating pin; 440-Sealing gasket; 450-ring sealing protrusion; 460-insertion part; 470-vent hole; 500-fiber guide mechanism; 510-needle holder; 511-bolt; 512-guide through hole; 513-connecting part; 514-guide part; 502- Guide assembly; 520-first fiber guide needle tube; 530-second fiber guide needle tube; 600-forming space; 610-tapered space; 620-cylindrical space; 630-outlet end; 700-pressure ring.

detailed description

To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the present disclosure will be described clearly and completely in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, but not all的实施例。 Examples. The components of the embodiments of the present disclosure generally described and illustrated in the drawings herein can be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the claimed disclosure, but merely represents selected embodiments of the disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present disclosure.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, therefore, once an item is defined in one drawing, there is no need to further define and explain it in subsequent drawings.

In the description of the present disclosure, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear The orientation or positional relationship indicated by ", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally placed when the product of the invention is used, only for the convenience of describing the present disclosure and simplifying the description, rather than indicating Or implies that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present disclosure.

In addition, if the terms "first", "second", "third", etc. appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In addition, the appearance of the terms "horizontal", "vertical", "overhanging", etc. does not mean that the component is absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

In the description of the present disclosure, it should also be noted that, unless otherwise clearly specified and limited, the terms "setup", "installation", "connected", "connected", etc. should be interpreted in a broad sense, for example, it can be The fixed connection can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between the two components. For those of ordinary skill in the art, the specific meaning of the above terms in the present disclosure may be understood in specific situations.

It should be noted that the features in the embodiments of the present disclosure may be combined with each other without conflict.

The production process of the loose tube of the full-dry optical cable provided by the present disclosure includes the following steps:

Fill the loose tube with compressed gas during the process of forming the loose tube;

Cool the loose tube;

Pass the optical fiber or optical fiber ribbon into the lumen of the loose tube behind the cooling port.

Optionally, the process steps of charging compressed gas into the loose tube include:

The compressed gas is purified and dehumidified, and then the dehumidified compressed gas is filled into the loose tube through the gas storage tank and the flow controller. In other words, the compressed gas is purified and dehumidified and stored in the gas storage tank, and then the compressed gas in the gas storage tank is filled into the lumen of the loose casing through the pipeline between the gas storage tank and the loose casing A flow controller is provided on the delivery pipeline, and the flow controller is configured to control the flow of compressed gas in the pipeline. Optionally, the flow controller includes a flow valve, which is installed on the delivery pipeline between the gas storage tank and the loose tube.

Optionally, the process steps of cooling the loose tube include:

Let the loose tube pass through the second cooling slot and auxiliary traction; in other words, the loose tube cooled by the first cooling slot is wound around the main wheel traction, and then the loose tube is pulled from the main wheel traction After unwinding, it enters the second cooling slot, and the second cooling is performed through the second cooling slot. The loose tube after the second cooling is wound around the auxiliary traction;

Put the loose tube into the take-up device and close it on the reel. In this step, after the second cooling, the loose tube wound around the auxiliary traction enters the wire take-up device and is stored on the wire take-up reel of the wire take-up device.

The present disclosure also provides a full-dry optical fiber cable loose tube forming device to alleviate that the loose tube in the related art tends to be flat when extruded, and the optical fiber is easy to stick with the loose tube, causing the optical fiber attenuation index to be unqualified Technical issues.

As shown in FIG. 1, the full-dry optical cable loose tube forming device provided by the present disclosure includes: a machine head 100, a mold core 200 and a mold sleeve 300, the machine head 100 is provided with a vent 101, and the mold core 200 is connected to the machine head 100 , One end of the core 200 is inserted into the vent hole 101 of the handpiece 100, and the other end of the core 200 extends out of the handpiece 100; the core 200 is provided with a core hole 201, and the core hole 201 communicates with the air hole 101 The mold sleeve 300 is sleeved on the outer periphery of the portion of the mold core 200 that extends beyond the head 100. A molding space 600 is formed between the inner wall of the mold sleeve 300 and the outer wall of the mold core 200, and the molding space 600 communicates with the outside. Optionally, the inner wall of the mold sleeve 300 is ring-shaped. Correspondingly, the outer wall of the mold core 200 is ring-shaped. An annular molding space 600 communicating with the outside is formed between the inner wall of the mold sleeve 300 and the outer wall of the mold core 200.

Optionally, the handpiece 100 is provided with a vent hole 101 penetrating the handpiece 100 along its length, and the mold core 200 is installed at one end of the vent hole 101. The core 200 is provided with a core through-hole 201 penetrating through the core 200 along its length. The core through-hole 201 communicates with the vent 101 and is coaxial with the vent 101. The first end of the core 200 is located inside the vent 101, and the second end of the core 200 is located outside the vent 101. In other words, the first end of the core 200 is inserted into the vent 101 and the second end is exposed The vent 101 is outside. The mold sleeve 300 is sleeved on the second end of the mold core 200. The mold sleeve 300 has a forming through hole penetrating through the mold sleeve 300 along its length. The inner wall of the forming through hole is spaced from the outer wall of the mold core 200 to form a molding space 600. .

During the production process, the loose tube material extruded from the extruder enters the molding space 600 from the side of the molding space 600. Since the head 100, the mold core 200, and the mold sleeve 300 are kept relatively fixed, in other words, the The shape and size remain relatively fixed. Under the action of the squeezing force of the machine head 100, the core 200, the mold sleeve 300 and the external loose tube material, the loose tube material is extruded into a tubular loose tube, and the The formed loose tube is extruded from the right end of the forming space 600 shown in FIG. 1, that is, the formed loose tube is extruded from the outlet end 630 of the forming space 600, and the extruded loose tube Facilitate the subsequent process operations. During the molding process, the lumen of the loose tube is communicated with the core through hole 201. After the compressed gas is introduced into the vent hole 101, the compressed gas enters the lumen of the loose tube through the vent hole 101 and the core through hole 201. Support the loose tube to make the outer diameter of the loose tube round and smooth and improve the forming quality of the loose tube.

Optionally, the mold core 200 includes a plug section 210, a first tapered section 220, and a first cylindrical section 230 that are sequentially connected. In other words, the model 200 includes a plug section 210, a first tapered section 220, and a first A cylindrical section 230, the plug section 210 is connected to one end of the first tapered section 220, the other end of the first tapered section 220 is connected to the first cylindrical section 230, and the core through hole 201 sequentially penetrates the plug section 210 , The first tapered section 220 and the first cylindrical section 230. It should be noted that the inner diameters of both ends of the first tapered section 220 are unequal, and the first cylindrical section 230 is connected to the end with the smaller inner diameter of the first tapered section 220. Correspondingly, the insertion section 210 and the first tapered section The end of section 220 with the larger inner diameter is connected. Optionally, the inner diameter of the first cylindrical section 230 is equal to the smallest inner diameter of the first tapered section 220.

Optionally, the insertion section 210, the first tapered section 220 and the first cylindrical section 230 are an integrally formed structure. The first tapered section 220 corresponds to the central position of the molding space 600, and the first cylindrical section 230 is away from the first One end of a tapered section 220 is located at the outlet end 630 of the molding space 600, that is, the model through-hole penetrating the first cylindrical section 230 communicates with the molding space 600, and the compressed gas output from the model through-hole can enter through the molding The space 600 is extruded into the loose tube. Optionally, the insertion section 210, the first cylindrical section 230 and the first tapered section 220 are coaxial. During installation, the insertion section 210 is inserted into the vent hole 101 of the handpiece 100, and the first tapered section 220 and the first cylindrical section 230 expose the vent hole 101.

Optionally, the mold sleeve 300 includes a connected second tapered section 310 and a second cylindrical section 320; it should be noted that the second cylindrical section 320 is connected to the end of the second tapered section 310 with a smaller inner diameter, Optionally, the inner diameter of the second cylindrical section 320 is equal to the smallest inner diameter of the second tapered section 310. Optionally, the second tapered section 310 and the second cylindrical section 320 are an integrally formed structure.

During installation, the insertion section 210 is inserted into the vent hole 101 of the handpiece 100, the second tapered section 310 is sleeved on the outer periphery of the first tapered section 220, and the second cylindrical section 320 is sleeved on the first cylindrical section 230 perimeter. Meanwhile, there is a space between the first tapered section 220 and the second tapered section 310, a space between the second cylindrical section 320 and the first cylindrical section 230, the first tapered section 220 and the second tapered section The space between 310 and the space between the first cylindrical section 230 and the second cylindrical section 320 communicate to form the molding space 600.

Referring to FIG. 2, optionally, the second tapered section 310 is disposed opposite to the first tapered section 220, and an inner wall of the second tapered section 310 is spaced from an outer wall of the first tapered section 220 to form The annular tapered space 610. The taper of the second tapered section 310 is the same as the taper of the first tapered section 220. The second cylindrical section 320 is sleeved on the outer circumference of the first cylindrical section 230 and is coaxial with the first cylindrical section 230. The inner circumferential wall of the second cylindrical section 320 and the inner circumferential wall of the first tapered section 220 There is a space to form a cylindrical space 620, and the tapered space 610 and the cylindrical space 620 communicate with each other and form a molding space 600.

First conical section 220 First cylindrical section 230 First conical section 220 forming space 600 First cylindrical section 230 forming space 600 Outlet end 630 First cylindrical section 230 First conical section 220 Second conical section 310 First tapered section 220 Second tapered section 310 First tapered section 220 Second cylindrical section 320 First cylindrical section 230 First cylindrical section 230

During the production process, the loose tube material enters the forming space 600. In other words, the loose tube material first enters the conical space 610 of the forming space 600, and then under the action of external pressing force, the loose tube material is shown in the figure. 1 Move to the right from the middle angle of view, and enter the cylindrical space 620, and finally the loose tube material moves from the right end of the forming space 600, that is, the loose tube material moves to the outlet end 630 of the forming space 600 and from the outlet end 630 Move out. The loose tube material wraps the mold core 200 as it moves from left to right. With the cooperation of the mold core 200 and the mold sleeve 300, a tube-shaped loose tube is formed, which is removed from the right end of the forming space 600. Since the mold core 200 includes the first tapered section 220, the mold sleeve 300 includes the second tapered section 310. During the extrusion process, the loose tube material flows between the first tapered section 220 and the second tapered section 310. When the outlet end 630 of the forming space 600 moves, the first tapered section 220 and the second tapered section 310 have a guiding effect, which facilitates the flow of the loose tube material from the tapered space 610 to the cylindrical space 620, and facilitates the forming of the loose tube .

Optionally, the molding device further includes an inflatable base 400 mounted on the handpiece 100. The inflatable base 400 is provided with an inflation inlet 410 and an air delivery hole 411, and the air delivery hole 411 communicates with the inflation inlet 410 and the ventilation hole 101, respectively.

As shown in FIG. 1, the inflatable base 400 is installed at the left end of the handpiece 100 through positioning pins 430. Obviously, the inflatable base 400 can also be welded to the left end of the handpiece 100, or the inflatable base 400 is fixed to the left end of the handpiece 100 by bolts . Optionally, the first end of the inflatable base 400 is located in the vent 101, and the second end of the inflatable base 400 is located outside the vent 101; a sealing gasket 440 is provided between the inflatable base 400 and the head 100 to improve the inflatable base The tightness between the connection position of 400 and the head 100 reduces the risk of compressed gas leakage. The inflation inlet 410 is provided on the peripheral wall of the second end portion of the inflation base 400 and communicates with the air delivery hole 411, which is coaxial with the vent hole 101.

Optionally, the inflatable base 400 is a columnar structure, the outer peripheral wall of the inflatable base 400 is provided with a ring-shaped sealing protrusion 450, the inflatable base 400 is provided with an air delivery hole 411 penetrating through the inflatable base 400 along its length, and the annular seal protrusion 450 is along The air supply hole 411 projects radially outward from the outer peripheral wall of the inflatable base 400, and the inflatable base 400 and the annular sealing protrusion 450 may be integrally formed. An inflation inlet 410 is provided on the peripheral wall of the inflation base 400, and the inflation inlet 410 communicates with the air delivery hole 411. The inflatable base 400 has an insertion portion 460 configured to be inserted into the vent hole 101. After the insertion portion 460 is inserted into the vent hole 101, the air vent hole 411 communicates with the vent hole 101, the end of the air vent hole 411 away from the handpiece 100 is closed, and the ring shape An end surface of the sealing protrusion 450 near the machine head 100 corresponds to the outer side surface of the machine head 100, and a sealing gasket 440 is provided between the annular sealing protrusion 450 and the machine head 100, and the sealing gasket 440 is pressed and deformed to achieve Sealing at the connection position of the annular sealing protrusion 450 and the handpiece 100. The inflation inlet 410 and the insertion portion 460 are located on both sides of the annular sealing protrusion 450.

Optionally, the molding device further includes a pressure ring 700, which is sleeved outside the inflatable base 400 and bears on a side surface of the annular sealing protrusion 450 away from the insertion portion 460, and the pressure ring 700 is fixedly connected to the handpiece 100 . The pressure ring 700 is connected to the machine head 100 to indirectly fix the inflatable base to the machine head 100. The annular sealing protrusion 450 and the sealing gasket are not provided with a hole structure to connect with the machine head 100, and the annular sealing protrusion 450 is connected to the machine head The sealing performance at the connection position of 100 is good. It should be noted that the pressure ring 700 may be fixedly connected to the handpiece 100 through positioning pins, or the pressure ring 700 may be welded to the handpiece 100, or the pressure ring 700 and the handpiece 100 may be fixedly connected by bolts.

Compressed gas enters the air hole 411 of the inflatable base 400 through the air inlet 410, and then enters the loose tube through the air hole 411, the vent hole 101 and the mold core through hole 201 in order to support the inner tube wall of the loose tube To keep the outer wall of the loose tube round and smooth.

Optionally, the inflation base 400 is installed with a pressure relief valve 420, the pressure relief valve 420 is located at the side of the inflation base 400, and the pressure relief valve 420 communicates with the air delivery hole 411.

Optionally, the side wall of the inflatable base 400 is provided with a vent hole 470, the vent hole 470 communicates with the vent hole 411, and the pressure relief valve 420 is installed in the vent hole 470. During the operation, when the compressed gas is filled into the loose tube, when the gas pressure in the loose tube is greater than the set value, the excess gas in the inflatable base 400 is automatically discharged through the pressure relief valve 420, and the inside of the inflatable base 400 is discharged Pressure, so that the gas pressure in the loose tube is kept constant to ensure the forming quality of the loose tube.

Optionally, the molding device further includes an optical fiber guide mechanism 500, and the inside of the optical fiber guide mechanism 500 communicates with the mold core through hole 201.

The light beam or the light stack and the water blocking yarn or the water blocking tape can enter the mold core through hole 201 through the guide mechanism. Since the mold core through hole 201 communicates with the inside of the loose tube, the light beam or the light stack and the water blocking yarn or The water blocking tape can enter the loose tube through the core through hole 201.

Optionally, the fiber guide mechanism 500 includes a needle base 510 and a guide assembly 502. The needle base 510 is mounted on the machine head 100, and the needle base 510 is provided with a guide through hole 512 connected to the mold core through hole 201; the guide assembly 502 is installed in the guide through hole 512.

Optionally, the needle base 510 is installed on the inflatable base 400. In other words, the needle base 510 is fixed to the handpiece 100 through the inflatable base 400. During installation, the air hole 411 is inserted into the air hole 411 from the left end of the air hole 411, that is, the needle hole 510 is inserted into the air hole 411 from the end of the inflatable base 400 away from the

handpiece

100, 411 is blocked at the end away from the handpiece 100. The guide through hole 512 penetrates the needle base 510 in the longitudinal direction of the needle base 510 and is coaxial with the gas delivery hole 411. The needle base 510 includes an integrally formed connecting portion 513 and a guide portion 514. The guide portion 514 is located in the air delivery hole 411, and the outer diameter is smaller than the diameter of the air delivery hole 411. The inflatable base 400 constitutes the inner wall of the air delivery hole 411 and the guide portion 514. Between the outer peripheral walls, there is an annular gap configured to pass compressed gas. The connecting portion 513 is installed at the left end of the inflatable base 400, and the diameter of the connecting portion 513 is larger than the diameter of the gas delivery hole 411 to close the left end of the gas delivery hole 411, in other words, the connection position of the connection portion 513 and the guide portion 514 A stepped structure is formed, the guide portion 514 can be inserted into the air delivery hole 411, the connection portion 513 is blocked outside the air delivery hole 411, and one end face of the connection portion 513 is in sealing fit with the end face of the inflation base 400 away from the handpiece 100.

The light beam or the light stack and the water blocking yarn or the water blocking tape can enter the mold core through hole 201 through the guide assembly 502. Since the core through hole 201 communicates with the inside of the loose tube, the light beam or the light stack and the water blocking yarn Or the water blocking tape can enter the loose tube through the through hole 201 of the core. The guide assembly 502 is installed on the inflatable base 400 through the needle base 510, which facilitates the installation and disassembly of the guide assembly 502.

Optionally, the guide assembly 502 includes a first fiber guide needle tube 520 and a second fiber guide needle tube 530, the first fiber guide needle tube 520 is installed at the first end of the needle tube holder 510, and the second fiber guide needle tube 530 is installed at the needle tube holder 510 The second end. During actual installation, the first fiber guide needle tube 520 is inserted into one end of the guide through hole 512 provided on the needle holder 510, and the second fiber guide needle tube 530 is inserted into the other end of the guide through hole 512 provided on the needle holder 520.

Optionally, the first fiber guide needle tube 520 is provided with a first fiber guide hole, the second fiber guide needle tube 530 is provided with a second fiber guide hole, and both the first fiber guide hole and the second fiber guide hole are in communication with the guide through hole 512 .

The axis of the first fiber guide hole and the axis of the second fiber guide hole both coincide with the axis of the guide through hole 512. The needle base 510 is connected to the inflatable base 400 through the bolt 511. Specifically, the needle base 510 is provided with a connecting through hole configured for the bolt 511 to pass through, and the inflatable base 400 is provided with a threaded hole that cooperates with the bolt 511, and the bolt 511 passes through The needle base 510 is installed on the inflatable base 400 through the connection through hole and the screw hole. It should be noted that the number of bolts is set as required. For example, a plurality of bolts may be provided, and the plurality of bolts are evenly spaced along the circumferential direction of the inflation base 400 to improve the connection firmness between the needle base 510 and the inflation base 400.

Optionally, the diameter of the connecting through hole is larger than the diameter of the bolt 511, and the radial position of the needle base 510 relative to the inflatable base 400 can be adjusted by adjusting the relative position of the axis of the connecting through hole and the axis of the bolt 511, thereby adjusting the first fiber guide hole The coaxiality with the second fiber guide hole and the air delivery hole 411, so as to improve the guiding accuracy. After the adjustment is completed, use the bolt through the connection through hole to screw into the threaded hole on the inflatable base 400 to achieve the needle base 510 and the inflation The fixed connection of the base 400.

A production process and a forming device for a loose tube of a full-dry optical cable provided by the present disclosure. The production process of a loose tube of a full-dry optical cable includes: extruding the loose tube material into a tube-shaped loose tube by a loose tube forming device; In the process of forming the loose tube, the compressed gas is filled into the lumen of the loose tube; the loose tube is cooled; the optical fiber or the optical fiber ribbon is inserted into the lumen of the loose tube after the cooling port. In the production process provided by the present disclosure, compressed gas is continuously introduced into the lumen of the loose tube during the extrusion process of the loose tube, and the compressed gas is supported inside the loose tube so that the outer diameter of the loose tube does not change Affected by the fluctuation of gas pressure, the outer diameter of the loose tube is round and smooth, and can ensure that the loose tube forms a reasonable fiber excess length, meets the fiber transmission performance, the fiber excess length is stable, and the attenuation index is good.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limiting them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present disclosure range.

Industrial applicability:

In summary, the present disclosure provides a production process and a forming device for a loose tube of a full-dry optical cable, and the forming quality of the loose tube is high.

Claims

A production process for loose tube of full-dry optical cable, which is characterized by:

The loose tube material is extruded into a tubular loose tube by the loose tube forming device;

Fill the loose tube with compressed gas;

Cooling the loose tube;

Pass the optical fiber or optical fiber tape into the loose tube.
A production process for loose tube of full-dry optical cable, which is characterized by:

Fill the lumen of the loose tube in the extrusion process with compressed gas.
The production process of the loose tube of the full-dry optical cable according to claim 1, further comprising:

The formed loose tube is cooled.
The production process of the loose tube of the full-dry optical cable according to claim 2 or 3, further comprising:

Pass the optical fiber or light into the lumen of the loose tube.
The production process for a loose tube of a full-dry optical cable according to any one of claims 1 to 4, characterized in that the process step of charging compressed gas into the lumen of the loose tube includes:

The compressed gas is purified and dehumidified, and then filled into the loose tube through the gas storage tank and the flow controller.
The production process of a loose tube loose tube according to claim 1 or 3, characterized in that the process step of cooling the loose tube includes:

Make the loose tube wind around the main wheel traction after passing through the first cooling groove;

Unwinding the loose tube wound on the main wheel traction and passing through the second cooling groove and auxiliary traction;

The loose tube enters the wire-receiving device and is collected on the reel of the wire-receiving device.
A full-dry optical fiber cable loose tube forming device is characterized by comprising: a machine head, a mold core and a mold sleeve, the machine head is provided with a vent hole, the mold core is installed on the machine head, the mold The core is provided with a mold core through hole, and the mold core through hole communicates with the vent hole; the mold sleeve is sleeved on the outer periphery of the mold core, and forms a molding space with the mold core, and the molding space Connect with the outside.
The loose tube forming device for a full-dry optical cable according to claim 7, wherein the mold core includes a first tapered section and a first cylindrical section, the first cylindrical section and the first The end of the tapered section with a smaller inner diameter is connected; the mold sleeve includes a second tapered section and a second cylindrical section, the second cylindrical section is connected to the end with a smaller inner diameter of the second tapered section ;

The second tapered section is sleeved on the outer circumference of the first tapered section and both define a tapered space, and the second cylindrical section is sleeved on the outer circumference of the first cylindrical section and both A cylindrical space is defined, and the tapered space communicates with the cylindrical space and constitutes the molding space.
The device for forming a loose tube of a full-dry optical cable according to claim 8, wherein the mold core further comprises a plug-in section, the plug-in section and the first tapered section are away from the first column One end of the shaped section is connected, and the through hole of the mold core sequentially penetrates the insertion section, the first tapered section, and the first cylindrical section; the insertion section is inserted into the vent hole.
The forming device for a loose tube of a full-dry optical cable according to any one of claims 7-9, wherein the forming device further comprises an inflatable base mounted on the handpiece, the inflatable base is provided with an inflatable An inlet and a gas delivery hole, the gas delivery hole communicating with the inflation inlet and the vent hole, respectively.
The device for forming a loose tube of a full-dry optical cable according to claim 10, wherein the inflation inlet is provided on a side wall of the inflation base, and the gas transmission hole penetrates along the length direction of the inflation base The inflatable base.
The full-dry optical fiber cable loose tube forming device according to claim 10 or 11, wherein an annular sealing protrusion is provided on an outer circumferential surface of the inflatable base, the inflatable base has an insertion portion, and the insertion portion is inserted In the vent hole, the annular sealing protrusion bears against the outer wall of the handpiece.
The loose tube forming device for a full-dry optical cable according to claim 12, further comprising a pressure ring, the pressure ring is sleeved outside the inflatable base, and the pressure ring is connected to the handpiece, The annular sealing protrusion is clamped between the pressure ring and the handpiece.
The full-dry optical fiber cable loose tube forming device according to any one of claims 10 to 13, further comprising a sealing gasket, the sealing gasket being located between the inflatable base and the handpiece , Configured to seal the connection position of the inflatable base and the handpiece.
The full-dry optical fiber cable loose tube forming device according to any one of claims 10 to 14, wherein a pressure relief valve is installed on the inflatable base, and the pressure relief valve is in communication with the gas transmission hole.
According to any one of claims 7-15, the forming device for the loose tube of the optical fiber cable is characterized in that the forming device further comprises an optical fiber guiding mechanism, and the optical fiber guiding mechanism is connected to the handpiece. The inside of the optical fiber guide mechanism communicates with the through hole of the mold core.
The loose tube forming device for a fully dry optical cable according to claim 16, wherein the optical fiber guide mechanism includes a needle base and a guide assembly, the needle base is mounted on the machine head, and the needle base is provided with A guide through hole communicating with the through hole of the mold core; the guide assembly is installed in the guide through hole.
The device for forming a loose tube of a full-dry optical cable according to claim 17, wherein the needle tube holder is located in the gas delivery hole, and an outer wall of the needle tube holder and the inner wall of the gas delivery hole are provided Gap, and one end of the needle base is inserted into the through hole of the mold core, and there is a gap between the needle base and the inner wall of the through hole of the mold core, so that the gas delivery hole, the vent hole and the The through holes of the mold core are sequentially connected.
The loose tube forming device for a full-dry optical cable according to claim 17 or 18, characterized in that the needle base includes a connecting portion and a guide portion, and the guide through holes penetrate the connecting portion and the A guide portion, the guide portion passes through the air delivery hole and is inserted into the mold core through hole, and the connection portion is connected to the inflatable base.
The loose tube forming device for a full-dry optical cable according to any one of claims 17-19, wherein the guide assembly includes a first fiber guide needle tube and a second fiber guide needle tube, and the first fiber guide The needle tube is installed at the first end of the needle tube holder, and the second fiber guide needle tube is installed at the second end of the needle tube holder;

The first fiber guide needle tube is provided with a first fiber guide hole, the second fiber guide needle tube is provided with a second fiber guide hole, and both the first fiber guide hole and the second fiber guide hole are in contact with the guide The through hole communicates.