A device and method for precisely controlling the excess length of a dry-type optical fiber ribbon loose tube

Abstract

This invention discloses a fully dry optical fiber ribbon loose tube excess length precision control device and method, belonging to the field of optical fiber production. The fully dry optical fiber ribbon loose tube excess length precision control device includes a housing with an inlet and an outlet for optical fiber entry and exit, and further includes a traction wheel for pulling the optical fiber and a driven wheel for tensioning the optical fiber, both rotatably mounted within the housing. The traction wheel has multiple first annular receiving grooves, and the driven wheel has multiple second annular receiving grooves. This invention can improve the cooling effect and cooling rate of the optical fiber, enabling rapid preliminary shaping and relatively uniform cooling. It prevents uneven cooling from causing uneven local shrinkage of the optical fiber, which affects the production quality, and can meet the requirements of high-speed production lines.

Description

Technical Field

[0001] This invention relates to the field of optical fiber production technology, and in particular to a device and method for precise control of the excess length of loose tubes in a fully dry optical fiber. Background Technology

[0002] In the optical cable manufacturing process, secondary extrusion molding is one of the core processes. Its main purpose is to extrude a loose tube around the outside of the optical fiber (or fiber ribbon) to protect and isolate the fiber, ensuring the stability of its transmission performance. Precise control of the excess fiber length within the loose tube is a key parameter determining the optical cable's mechanical properties, temperature characteristics, and transmission reliability. Appropriate excess fiber length effectively buffers stress under tension, compression, and bending conditions, preventing fiber damage and adapting to thermal expansion and contraction caused by environmental temperature changes, ensuring long-term stable operation of the optical cable.

[0003] Currently, in the secondary molding production of loose tubes for all-dry optical fibers, the loose tubes need to undergo multiple cooling processes and excess length control after molding in order to achieve full crystallization and uniform shrinkage of PBT (polybutylene terephthalate) material, thereby controlling the excess length fluctuation within a reasonable range. The industry generally adopts a three-stage cooling process of "hot water tank - warm water tank - cold water tank". The temperature of the hot water section is usually controlled at 60℃-85℃, the temperature of the warm water section is controlled at 35℃-55℃, and the temperature of the cold water section is controlled at 15℃-25℃. The gradual cooling and shrinkage of the loose tube is achieved by changing the water temperature gradient. In order to achieve precise control of the excess length, the existing technology usually adds an excess length control device at the end of the warm water tank. The synergistic effect of increasing the excess length by water temperature cooling and decreasing the excess length by device control is used to make the excess length of the optical fiber meet the specified production requirements. However, the current excess length control device uses exposed traction wheels and driven wheels to wind the optical fiber multiple times, and uses spray heads to achieve exposed cooling. Although the temperature of the cooling medium sprayed by the nozzle is consistent, the cooling medium is in a free fall state, which cannot achieve uniform spraying of all parts of the optical fiber. This results in uneven heating and cooling of different areas of the optical fiber, which in turn causes low uniformity of loose tube shrinkage, fluctuations in optical fiber excess length, and difficulty in exceeding the upper limit of precise excess length control. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a fully dry fiber optic ribbon loose tube excess length precision control device that can overcome or at least partially solve the above problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fully dry fiber optic cable loose tube excess length precision control device includes a housing with an inlet and an outlet for fiber optic cable entry and exit, and further includes: a traction wheel for pulling the fiber optic cable and a driven wheel for tensioning the fiber optic cable, both rotatably mounted in the housing, wherein the traction wheel has multiple first annular receiving grooves and the driven wheel has multiple second annular receiving grooves; a bonding inner core, disposed in the housing, with its two ends respectively bonded to the traction wheel and the driven wheel, and an inner guide groove provided on the outer side of the bonding inner core; a sealing sleeve, fitted on the outer side of the traction wheel and the driven wheel and bonded to them, with a unidirectional channel for the fiber optic cable to pass through between the sealing sleeve, the traction wheel, the driven wheel, and the bonding inner core, and an outer guide groove provided on the inner side of the sealing sleeve; an outlet tube, fixedly mounted on the sealing sleeve, and having a sealing ring bonded to the fiber optic cable inside the outlet tube; and a cooling assembly for supplying cooling medium into the unidirectional channel, with the cooling medium flowing from the outlet end to the inlet end.

[0006] In a preferred embodiment of the present invention, the cooling assembly includes a dual-fluid atomizing nozzle disposed on the inner core and communicating with the unidirectional channel. A cold water supply pump and an air pump are provided on one side of the housing. A cold water supply pipe is provided between the cold water supply pump and the dual-fluid atomizing nozzle, and an air pipe is provided between the air pump and the dual-fluid atomizing nozzle.

[0007] In a preferred embodiment of the present invention, a plurality of dual-fluid atomizing nozzles are provided, and all of the plurality of dual-fluid atomizing nozzles are connected to a cold water supply pipe, and a second flow control valve is provided between the dual-fluid atomizing nozzles.

[0008] In a preferred embodiment of the present invention, a heating sleeve is provided between the dual-fluid atomizing nozzle and the cold water supply pipe.

[0009] In a preferred embodiment of the present invention, the sealing sleeve is provided with a plurality of temperature sensors.

[0010] In a preferred embodiment of the present invention, a plurality of single-fluid atomizing nozzles are provided on the inner core, a warm water supply pump is provided on one side of the housing, a warm water supply pipe is provided between the warm water supply pump and the single-fluid atomizing nozzles, and a first flow control valve is provided between the warm water supply pipe and the single-fluid atomizing nozzles.

[0011] In a preferred embodiment of the present invention, the cross-sectional areas of the unidirectional channels formed between the inner and outer guide channels, the unidirectional channels formed between the outer guide channel and the first annular receiving channel, and the unidirectional channels formed between the outer guide channel and the second annular receiving channel are the same, and the optical fiber is suspended between the inner and outer guide channels.

[0012] In a preferred embodiment of the present invention, a first arc-shaped buffer zone is provided between the second annular receiving groove and the fitting inner core, and the spraying end of the single-fluid atomizing nozzle is placed in the middle of the first arc-shaped buffer zone.

[0013] In a preferred embodiment of the present invention, a second arc-shaped buffer zone is provided between the first annular receiving groove and the fitting inner core, and the spraying end of the dual-fluid atomizing nozzle is placed in the middle of the second arc-shaped buffer zone.

[0014] A method for precise control of loose tube excess length in fully dry optical fiber mainly includes the following steps: Step 1: The processed optical fiber is first passed through a hot water tank and then a warm water tank, and then enters the box and is transported along the one-way channel inside the box. Step 2: Wind the optical fiber between the traction wheel and the driven wheel, adjust the excess length, and cool the optical fiber. Step 3: The cooling medium is delivered to the outgoing end of the unidirectional channel through the cooling assembly, and the cooling medium flows to the incoming end to cool the optical fiber. Step 4: After cooling, the optical fiber is placed in a cold water bath for final shaping.

[0015] Compared with the prior art, the present invention provides a fully dry fiber optic ribbon loose tube excess length precision control device, which has the following beneficial effects: 1. This fully dry fiber optic cable loose tube excess length precision control device, by installing a fitted inner core between the traction wheel and the driven wheel, and then cooperating with the sealing sleeve installed on the outside to form a one-way channel, the cooling medium flows towards the fiber inlet. The cross-sectional area of ​​the one-way channel is relatively small, and the flow rate of the internal cooling medium is also relatively fast, which can improve the cooling effect and cooling rate of the fiber, enabling it to quickly perform preliminary shaping, and the cooling is relatively uniform, preventing uneven cooling from causing uneven local shrinkage of the fiber and affecting the production quality of the fiber.

[0016] 2. This fully dry fiber optic cable with loose tube excess length precision control device draws water from the cold water tank through the cold water supply pump, and then delivers it to the dual-fluid atomizing nozzle through the cold water supply pipe. An air pump supplies air, and the gas-liquid mixture sprayed from the dual-fluid atomizing nozzle enters the unidirectional channel. Combined with the airflow, the water mist flows smoothly along the unidirectional channel towards the fiber optic cable's inlet, thereby cooling the fiber to the specified temperature. This thorough cooling avoids the post-contraction caused by the secondary contraction in the cold water tank. Furthermore, the combined gas and water mist flow method offers less resistance than direct water flow, reducing the sealing requirements of the sealing ring and preventing the use of a high-sealing ring from affecting the fiber optic sheath. The lower resistance also allows for higher flow velocities, thus achieving rapid cooling over short distances, reducing equipment size, and meeting the needs of high-speed production lines.

[0017] 3. This fully dry fiber optic cable loose tube excess length precision control device achieves gradient supply of cooling medium and provides gradient flow rate by setting multiple dual-fluid atomizing nozzles and controlling the flow rate of each dual-fluid atomizing nozzle through a second flow control valve. Since the temperature at the inlet end gradually increases to the outlet end, gradient cooling can achieve rapid cooling of high-temperature areas and normal cooling of relatively low-temperature areas. It has high adaptability and can improve its cooling rate. In addition, it can improve the optimal cooling effect under the same power cold water supply pump.

[0018] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This invention can improve the cooling effect and cooling rate of optical fibers, enabling them to be pre-shaped quickly and with relatively uniform cooling. It prevents uneven cooling from causing uneven local shrinkage of the optical fiber, which would affect the production quality of the optical fiber, and can meet the needs of high-speed production lines. Attached Figure Description

[0019] Figure 1 This is the front view of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the structure of the present invention. Figure 3 ; Figure 5 This is a schematic diagram of a partially unfolded structure of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of a partially unfolded structure of the present invention. Figure 2 ; Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle; Figure 8 This is a cross-sectional schematic diagram of the traction wheel and the driven wheel in this invention; Figure 9 This is a schematic diagram of optical fiber winding in Embodiment 5 of the present invention.

[0020] In the diagram: 1. Box body; 101. Water storage tank; 102. Warm water tank; 103. First return pipe; 104. Cold water tank; 105. Second return pipe; 2. Traction wheel; 201. First annular receiving groove; 202. First mounting screw; 203. Motor; 3. Driven wheel; 301. Second annular receiving groove; 302. Second mounting screw; 4. Fitting inner core; 401. Inner guide groove; 5. Warm water supply pump; 501. Warm water supply pipe; 5 02. Single-fluid atomizing nozzle; 503. First flow control valve; 504. First arc-shaped buffer zone; 6. Cold water supply pump; 601. Cold water supply pipe; 602. Dual-fluid atomizing nozzle; 603. Second flow control valve; 604. Heating sleeve; 605. Air pump; 606. Air pipe; 607. Second arc-shaped buffer zone; 7. Sealing sleeve; 701. External guide groove; 702. Temperature sensor; 703. Outlet pipe; 704. Sealing ring. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Example 1: Refer to Figures 1-9 A fully dry fiber optic cable loose tube excess length precision control device includes a housing 1 with an inlet and an outlet for fiber optic cable entry and exit, and further includes: The traction wheel 2 for pulling the optical fiber and the driven wheel 3 for tensioning the optical fiber are both rotatably mounted in the housing 1. The traction wheel 2 is provided with multiple first annular receiving grooves 201, and the driven wheel 3 is provided with multiple second annular receiving grooves 301. A motor 203 is provided on the rear side of the housing 1, and the motor 203 is used to drive the traction wheel 2 to rotate. Currently, optical fiber processing requires secondary coating, the core of which is wrapping a loose tube around the outside of the optical fiber. The extruder is responsible for forming the tube, and subsequent cooling and excess length control are required. Cooling has a significant impact on the excess length. Currently, hot water tank, warm water tank, and cold water tank are generally used for sequential cooling and shrinkage. The main purpose is to allow PBT to crystallize fully and shrink evenly, achieving minimal excess length fluctuation. In addition, for production requirements, an excess length control device is added at the end of the warm water tank. This is because water cooling is used to increase the excess length, while the added device is used to reduce the excess length, thus achieving precise control and achieving the specified excess length. Reference Figure 1 The optical fiber in the warm water tank enters the housing 1 from the right side, then winds between the traction wheel 2 and the driven wheel 3, and finally exits from the left side of the housing 1. During the traction process, the optical fiber is closer to the inner circle of the winding path, while the length of the loose tube remains unchanged, thus reducing the excess length. After the excess length of the optical fiber is reduced, it enters the cold water tank for cooling again. The loose tube shrinks to increase the excess length. Then, the excess length can be precisely controlled by controlling the water temperature in conjunction with the excess length control equipment. Since the warm water bath is a transition section, and the optical fiber coming from the hot water bath can undergo initial shrinkage, and then undergo secondary shrinkage in the cold water bath, the optical fiber after passing through the warm water bath enters the excess length control equipment for warm water treatment, which can replace part of the warm water bath. Currently, multiple nozzles are set on the upper side of the inside of the box 1 to cool the optical fiber wound on the traction wheel 2 and driven wheel 3. Although the water temperature sprayed from the nozzles is uniform, the sprayed water moves freely downwards and cannot guarantee uniform spraying onto the optical fiber. This will cause uneven heating of each part of the optical fiber, resulting in low shrinkage uniformity and affecting the final quality of the optical fiber.

[0023] In practice, the temperature of the hot water section is 60℃-85℃, the temperature of the warm water section is 35℃-55℃, and the temperature of the cold water section is 15℃-25℃.

[0024] Therefore, the problems existing in the current fiber optic excess length control equipment can be solved by the following implementation method, which includes a bonding inner core 4, which is set in the housing 1, with its two ends bonded to the traction wheel 2 and the driven wheel 3 respectively, and an inner guide groove 401 is provided on the outer side of the bonding inner core 4. The sealing sleeve 7 is fitted on the outside of the traction wheel 2 and the driven wheel 3 and fits in close to the traction wheel 2 and the driven wheel 3. A one-way channel for optical fiber to pass through is provided between the sealing sleeve 7, the traction wheel 2, the driven wheel 3 and the inner core 4. An outer guide groove 701 is provided on the inner side of the sealing sleeve 7. The outlet tube 703 is fixedly mounted on the sealing sleeve 7, and the outlet tube 703 is provided with a sealing ring 704 that fits with the optical fiber. A cooling assembly for supplying cooling medium into a unidirectional channel, wherein the cooling medium flows from the outlet end to the inlet end.

[0025] A fitting inner core 4 is installed between the traction wheel 2 and the driven wheel 3, and then cooperates with the sealing sleeve 7 installed on the outside to form a one-way channel. The optical fiber moves in the one-way channel, and the outlet end is relatively sealed by the sealing ring 704. The cooling medium is delivered into the one-way channel by the cooling component. At this time, the cooling medium flows towards the inlet end of the optical fiber. The cross-sectional area of ​​the one-way channel is relatively small, and the flow rate of the cooling medium inside is relatively fast. This can improve the cooling effect and cooling rate of the optical fiber, enabling it to quickly achieve preliminary shaping, and the cooling is relatively uniform. This prevents uneven cooling from causing uneven local shrinkage of the optical fiber, which affects the production quality of the optical fiber.

[0026] In addition, this method allows for direct adjustment of the medium's flow rate to improve cooling efficiency, thereby enabling higher production speeds and increased production efficiency.

[0027] Example 2: In the specific cooling process, the following implementation method can be adopted: the cooling component includes a dual-fluid atomizing nozzle 602 disposed on the inner core 4 and connected to a one-way channel; a cold water supply pump 6 and an air pump 605 are provided on one side of the housing 1; a cold water supply pipe 601 is provided between the cold water supply pump 6 and the dual-fluid atomizing nozzle 602; and an air pipe 606 is provided between the air pump 605 and the dual-fluid atomizing nozzle 602. A water storage tank 101 and a cold water tank 104 are provided on one side of the housing 1. A second return pipe 105 is provided between the cold water tank 104 and the water storage tank 101. The pumping pipe of the cold water supply pump 6 is connected to the cold water tank 104.

[0028] During the cooling process, water is drawn from the cold water tank 104 through the pumping pipe of the cold water supply pump 6, and then transported to the dual-fluid atomizing nozzle 602 through the cold water supply pipe 601. Air is supplied in conjunction with the air pump 605. The gas-liquid mixture water mist sprayed from the dual-fluid atomizing nozzle 602 enters the unidirectional channel. With the airflow, the water mist can flow smoothly along the unidirectional channel to the inlet end of the optical fiber, thereby cooling the optical fiber to the specified temperature. After the optical fiber is sufficiently cooled to the specified value, the post-contraction after secondary contraction in the cold water tank can be avoided.

[0029] Furthermore, the combined flow of gas and water mist results in less flow resistance compared to using water directly, thus reducing the sealing requirements of the 704 sealing ring. This avoids the impact of using a high-sealing 704 sealing ring on the outer sheath of the optical fiber. The lower resistance also allows for higher flow rates, thereby achieving rapid cooling over short distances, reducing the size of the equipment, and meeting the needs of high-speed production lines.

[0030] In one embodiment, both the sealing sleeve 7 and the fitting inner core 4 are modular designs, which can be reassembled according to production needs. If the production requirements are low, the spray head inside the box 1 can be used directly for spraying and cooling. The spray head is not shown in the figure, and it is also connected in a detachable manner. Only the water supply pipe needs to be connected according to specific needs.

[0031] Multiple dual-fluid atomizing nozzles 602 are provided, and all multiple dual-fluid atomizing nozzles 602 are connected to the cold water supply pipe 601. A second flow control valve 603 is provided between the dual-fluid atomizing nozzles 602.

[0032] In a specific implementation, multiple dual-fluid atomizing nozzles 602 are configured, and the flow rate of each dual-fluid atomizing nozzle 602 is controlled by a second flow control valve 603 to achieve a gradient supply of cooling medium and provide a gradient flow rate. Since the temperature at the inlet end gradually increases to the outlet end, gradient cooling can achieve rapid cooling of high-temperature areas and normal cooling of relatively low-temperature areas. It has high adaptability and can improve the cooling rate. In addition, it can improve the optimal cooling effect under the same power of the cold water supply pump 6.

[0033] A heating sleeve 604 is provided between the dual-fluid atomizing nozzle 602 and the cold water supply pipe 601.

[0034] In a specific implementation, assuming the required temperature for the warm water section is 40°C, the dual-fluid atomizing nozzles 602 near the outlet end and 602 near the inlet end are arranged as follows: No. 1 dual-fluid atomizing nozzle 602, No. 2 dual-fluid atomizing nozzle 602, No. 3 dual-fluid atomizing nozzle 602, and so on. The cold water supply pipe 601 supplies water at 35°C. The No. 1 dual-fluid atomizing nozzle 602 is heated to 40°C through the heating sleeve 604, the No. 2 dual-fluid atomizing nozzle 602 is heated to 39.5°C through the heating sleeve 604, the No. 3 dual-fluid atomizing nozzle 602 is heated to 39°C, and so on. The temperature reduction difference is adjusted accordingly by the inlet speed. Therefore, by using the decreasing temperature, it mixes with the cooling medium that participates in the cooling and then heats up to form the specified cooling temperature, achieving precise and uniform cooling. This reduces the error caused by excess length and increases the cooling rate under the same cooling path.

[0035] Example 3: In a preferred embodiment, a plurality of temperature sensors 702 are provided on the sealing sleeve 7; The upper tangents of the first annular receiving groove 201 and the second annular receiving groove 301 are on the same horizontal straight line, and the temperature sensor 702 is located in the middle of the upper horizontal unidirectional channel.

[0036] Multiple temperature sensors 702 can monitor the temperature of each section in the unidirectional channel in real time, determine the water temperature of each section in the unidirectional channel in a timely manner, and adjust the supply rate of cooling medium according to the temperature.

[0037] If the temperature sensor 702 is used in conjunction with the cooling method in Example 2, the temperature sensor 702 is used to detect the temperature of each segment, and then the cooling medium supply temperature of each segment is appropriately adjusted through the heating sleeve 604 to achieve high-precision adjustment, thereby meeting the requirements of uniform cooling, fast cooling speed and high-speed production line. In addition, on low-speed production line, it can even replace the warm water tank for transition.

[0038] Example 4: In another embodiment, multiple single-fluid atomizing nozzles 502 are provided on the inner core 4, a warm water supply pump 5 is provided on one side of the housing 1, a warm water supply pipe 501 is provided between the warm water supply pump 5 and the single-fluid atomizing nozzles 502, and a first flow control valve 503 is provided between the warm water supply pipe 501 and the single-fluid atomizing nozzles 502.

[0039] A warm water tank 102 is provided on the lower side of the box body 1. A first return pipe 103 is provided between the warm water tank 102 and the water storage tank 101. The water pumping pipe of the warm water supply pump 5 is connected to the warm water tank 102. A one-way valve is provided in both the first return pipe 103 and the second return pipe 105. In a specific implementation, the single-fluid atomizing nozzle 502 can be used as an auxiliary cooling mechanism. The large water droplets sprayed out by it, combined with the small water droplets sprayed by the dual-fluid atomizing nozzle 602, can achieve both instantaneous cooling to achieve stable contraction and uniform cooling and contraction.

[0040] The cross-sectional areas of the one-way channels formed between the inner guide channel 401 and the outer guide channel 701, the one-way channels formed between the outer guide channel 701 and the first annular receiving channel 201, and the one-way channels formed between the outer guide channel 701 and the second annular receiving channel 301 are the same, and the optical fiber is suspended between the inner guide channel 401 and the outer guide channel 701.

[0041] The identical cross-sectional area within the unidirectional channel ensures that the cooling medium flows in the same manner in different areas, thereby achieving uniform cooling.

[0042] Furthermore, the overhead design of the optical fiber can avoid damage from friction, and the medium in the unidirectional channel between the inner guide groove 401 and the outer guide groove 701 can cool the upper and lower parts of the optical fiber, thereby effectively improving its cooling rate and cooling uniformity.

[0043] A first arc-shaped buffer zone 504 is provided between the second annular receiving groove 301 and the inner core 4, and the spraying end of the single-fluid atomizing nozzle 502 is placed in the middle of the first arc-shaped buffer zone 504.

[0044] A second arc-shaped buffer zone 607 is provided between the first annular receiving groove 201 and the inner core 4, and the spraying end of the dual-fluid atomizing nozzle 602 is placed in the middle of the second arc-shaped buffer zone 607.

[0045] Reference Figure 8 The spray end of the single-fluid atomizing nozzle 502 is placed in the middle of the first arc-shaped buffer zone 504. The water sprayed by the single-fluid atomizing nozzle 502 can cool the second annular receiving tank 301 in the driven wheel 3, thereby achieving the effect of cooling the optical fiber through the driven wheel 3 and avoiding uneven cooling.

[0046] The spraying end of the dual-fluid atomizing nozzle 602 is placed in the middle of the second arc-shaped buffer zone 607. The water mist sprayed by the dual-fluid atomizing nozzle 602 can cool the traction wheel 2, thereby achieving the effect of cooling the optical fiber through the traction wheel 2 and avoiding uneven cooling.

[0047] In another embodiment, the traction wheel 2 is assembled from a plurality of first plate-like structures corresponding to the first annular receiving groove 201, and the plurality of first plate-like structures are fixedly connected by a first mounting screw 202. The driven wheel 3 is assembled from multiple second plate-shaped structures corresponding to the second annular receiving groove 301, and the multiple second plate-shaped structures are fixedly connected by the second mounting screw 302; The diameters of the plurality of first annular receiving grooves 201 decrease sequentially, and the diameters of the plurality of second annular receiving grooves 301 also decrease sequentially. Furthermore, the reduction ratio of each first annular receiving groove 201 and the reduction ratio of each second annular receiving groove 301 are the same.

[0048] Both the traction wheel 2 and the driven wheel 3 are designed to be modular, which allows them to be replaced and can also be assembled into traction wheels 2 or driven wheels 3 with different reduction ratios to meet the needs of production lines with different excess length requirements.

[0049] Example 5: In another embodiment, if the product itself is a low-speed line, for low-speed production lines, the optical fiber can be wrapped alternately in a figure-eight pattern between multiple first annular receiving grooves 201 and second annular receiving grooves 301, and cooled in conjunction with the spray head in the box 1, so as to avoid the optical fiber on one side from being in contact with the traction wheel 2 or driven wheel 3 for a long time.

[0050] Example 6: A method for precise control of loose tube excess length in fully dry optical fiber, mainly including the following steps: Step 1: The processed optical fiber is first passed through a hot water tank and then a warm water tank, and then enters the box and is transported along the one-way channel inside the box. Step 2: Wind the optical fiber between the traction wheel and the driven wheel, adjust the excess length, and cool the optical fiber. Step 3: The cooling medium is delivered to the outgoing end of the unidirectional channel through the cooling assembly, and the cooling medium flows to the incoming end to cool the optical fiber. Step 4: After cooling, the optical fiber is placed in a cold water bath for final shaping.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A fully dry fiber optic cable loose tube excess length precision control device, comprising a housing (1) with an inlet and an outlet for fiber optic cable entry and exit, characterized in that, Also includes: The traction wheel (2) for pulling the optical fiber and the driven wheel (3) for tensioning the optical fiber are both rotatably installed in the housing (1). The traction wheel (2) is provided with multiple first annular receiving grooves (201), and the driven wheel (3) is provided with multiple second annular receiving grooves (301). The inner core (4) is fitted inside the housing (1), and its two ends are fitted with the traction wheel (2) and the driven wheel (3) respectively. The outer side of the inner core (4) is provided with an inner guide groove (401). A sealing sleeve (7) is fitted on the outside of the traction wheel (2) and the driven wheel (3) and fits against the traction wheel (2) and the driven wheel (3). A one-way channel for optical fiber to pass through is provided between the sealing sleeve (7), the traction wheel (2), the driven wheel (3) and the inner core (4). An outer guide groove (701) is provided on the inner side of the sealing sleeve (7). The outlet tube (703) is fixedly installed on the sealing sleeve (7), and the outlet tube (703) is provided with a sealing ring (704) that fits with the optical fiber. A cooling assembly for supplying cooling medium into a unidirectional channel, wherein the cooling medium flows from the outlet end to the inlet end.

2. The all-dry fiber optic ribbon loose tube excess length precision control device according to claim 1, characterized in that, The cooling assembly includes a dual-fluid atomizing nozzle (602) mounted on the inner core (4) and connected to the unidirectional channel. A cold water supply pump (6) and an air pump (605) are provided on one side of the housing (1). A cold water supply pipe (601) is provided between the cold water supply pump (6) and the dual-fluid atomizing nozzle (602), and an air pipe (606) is provided between the air pump (605) and the dual-fluid atomizing nozzle (602).

3. The device according to claim 2, wherein, Multiple dual-fluid atomizing nozzles (602) are provided, and all of the multiple dual-fluid atomizing nozzles (602) are connected to the cold water supply pipe (601). A second flow control valve (603) is provided between the dual-fluid atomizing nozzles (602).

4. The device according to claim 2, wherein, A heating sleeve (604) is provided between the dual-fluid atomizing nozzle (602) and the cold water supply pipe (601).

5. The precision control device for the excess length of the dry-type fiber optic cable jacket according to claim 1, wherein, The sealing sleeve (7) is equipped with multiple temperature sensors (702).

6. The all-dry fiber optic ribbon loose tube excess length precision control device according to claim 1, characterized in that, The inner core (4) is provided with a plurality of single-fluid atomizing nozzles (502). A warm water supply pump (5) is provided on one side of the housing (1). A warm water supply pipe (501) is provided between the warm water supply pump (5) and the single-fluid atomizing nozzles (502). A first flow control valve (503) is provided between the warm water supply pipe (501) and the single-fluid atomizing nozzles (502).

7. The device according to claim 1, wherein, The cross-sectional areas of the one-way channel formed between the inner guide groove (401) and the outer guide groove (701), the one-way channel formed between the outer guide groove (701) and the first annular receiving groove (201), and the one-way channel formed between the outer guide groove (701) and the second annular receiving groove (301) are the same, and the optical fiber is suspended between the inner guide groove (401) and the outer guide groove (701).

8. The all-dry fiber optic ribbon loose tube excess length precision control device according to claim 6, characterized in that, A first arc-shaped buffer zone (504) is provided between the second annular receiving groove (301) and the inner core (4), and the spraying end of the single-fluid atomizing nozzle (502) is placed in the middle of the first arc-shaped buffer zone (504).

9. The device according to claim 2, wherein, A second arc-shaped buffer zone (607) is provided between the first annular receiving groove (201) and the inner core (4), and the spraying end of the dual-fluid atomizing nozzle (602) is placed in the middle of the second arc-shaped buffer zone (607).

10. A method for precise control of excess length of loose tube in all-dry fiber optic cable, employing the precise control device for excess length of loose tube in all-dry fiber optic cable as described in any one of claims 1-9, characterized in that... The main steps include: Step 1: The processed optical fiber is first passed through a hot water tank and then through a warm water tank, and then enters the box (1) and is transported along the one-way channel inside the box (1); Step 2: Wind the optical fiber between the traction wheel (2) and the driven wheel (3) to adjust the excess length and cool the optical fiber; Step 3: The cooling medium is delivered to the outgoing end of the unidirectional channel through the cooling assembly, and the cooling medium flows to the incoming end to cool the optical fiber. Step 4: After cooling, the optical fiber is placed in a cold water bath for final shaping.

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