CN117412933A - Optical fiber manufacturing apparatus and optical fiber manufacturing method - Google Patents
Optical fiber manufacturing apparatus and optical fiber manufacturing method Download PDFInfo
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- CN117412933A CN117412933A CN202280038834.4A CN202280038834A CN117412933A CN 117412933 A CN117412933 A CN 117412933A CN 202280038834 A CN202280038834 A CN 202280038834A CN 117412933 A CN117412933 A CN 117412933A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 205
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 73
- 230000007246 mechanism Effects 0.000 claims abstract description 94
- 239000000463 material Substances 0.000 claims abstract description 66
- 238000005491 wire drawing Methods 0.000 claims abstract description 63
- 238000009987 spinning Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 230000005484 gravity Effects 0.000 claims description 25
- 238000011156 evaluation Methods 0.000 description 12
- 239000000835 fiber Substances 0.000 description 11
- 238000001816 cooling Methods 0.000 description 10
- 238000013459 approach Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012681 fiber drawing Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/029—Furnaces therefor
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
An optical fiber manufacturing apparatus includes: a wire drawing tower; a drawing furnace mounted on the drawing tower for heating the optical fiber preform to melt the optical fiber preform and spinning the optical fiber; and a second torque applying mechanism mounted on the drawing tower and applying a second torque to the drawing tower in a direction opposite to a direction in which the first torque applied to the drawing tower by the optical fiber base material acts, wherein the second torque can be reduced as the optical fiber base material becomes smaller.
Description
Technical Field
The present disclosure relates to an optical fiber manufacturing apparatus and an optical fiber manufacturing method.
The present application claims priority based on japanese application No. 2021-110795 filed on 7/2 of 2021, and the entire contents of the above-mentioned japanese application are incorporated by reference.
Background
Patent document 1 discloses an optical fiber drawing apparatus that actively damps vibration of an optical fiber base material by attaching a dummy base material of the optical fiber base material together with the optical fiber base material to a drawing tower and controlling a damping device based on vibration of the dummy base material.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2004-161499
Disclosure of Invention
An optical fiber manufacturing apparatus according to one embodiment for achieving the above object includes:
a wire drawing tower;
a drawing furnace mounted on the drawing tower for heating the optical fiber preform to melt the optical fiber preform and spinning the optical fiber; and
a second torque imparting mechanism mounted on the drawing tower and imparting a second torque to the drawing tower in a direction opposite to a direction in which the first torque imparted to the drawing tower from the optical fiber base material acts,
the imparting mechanism may reduce the second moment as the optical fiber preform becomes smaller.
In addition, an optical fiber manufacturing method according to one embodiment for achieving the above object includes:
a step of spinning an optical fiber by heating an optical fiber base material with a drawing furnace mounted on a drawing tower to melt the optical fiber base material; and
and applying a second torque to the drawing tower while reducing the second torque as the optical fiber base material becomes smaller, the second torque being in a direction opposite to a direction in which the first torque applied to the drawing tower by the optical fiber base material acts.
Drawings
Fig. 1 is a schematic configuration diagram of an optical fiber manufacturing apparatus according to a first embodiment, and shows a state immediately after a drawing process is started.
Fig. 2 is a schematic configuration diagram of an optical fiber manufacturing apparatus according to the first embodiment, and is a diagram showing a state when a certain period of time has elapsed after the start of a drawing process.
FIG. 3 is a graph showing the relationship between the weight of an optical fiber preform and the magnitude of a first moment.
Fig. 4 is a schematic configuration diagram of an optical fiber manufacturing apparatus according to a second embodiment.
Detailed Description
[ problem to be solved by the present disclosure ]
However, the drawing tower may be deflected by the weight of the base material, for example. When the drawing tower is flexed, the actual travel position of the glass fiber may deviate from the predetermined travel position. Therefore, in the manufacture of an optical fiber, it is important to suppress the deflection of the drawing tower so that the actual traveling position does not deviate from the predetermined traveling position.
An object of the present disclosure is to provide an optical fiber manufacturing apparatus and an optical fiber manufacturing method capable of suppressing deflection of a drawing tower.
[ Effect of the present disclosure ]
According to the present disclosure, an optical fiber manufacturing apparatus and an optical fiber manufacturing method capable of suppressing deflection of a drawing tower can be provided.
(description of embodiments of the present disclosure)
First, embodiments of the present disclosure are described.
An optical fiber manufacturing apparatus according to an embodiment of the present disclosure includes:
(1) A wire drawing tower;
a drawing furnace mounted on the drawing tower for heating the optical fiber preform to melt the optical fiber preform and spinning the optical fiber; and
a second torque imparting mechanism mounted on the drawing tower and imparting a second torque to the drawing tower in a direction opposite to a direction in which the first torque imparted to the drawing tower from the optical fiber base material acts,
the imparting mechanism may reduce the second moment as the optical fiber preform becomes smaller.
According to this configuration, the imparting mechanism imparts a second moment to the drawing tower in a direction opposite to the direction in which the first moment imparted to the drawing tower by the optical fiber base material acts. Further, since the imparting mechanism can reduce the second moment as the optical fiber base material becomes smaller, the optical fiber manufacturing apparatus according to the above configuration can suppress the deflection of the drawing tower.
In addition, in the optical fiber manufacturing apparatus according to one embodiment of the present disclosure,
(2) The applying mechanism is provided with a moving mechanism capable of moving in a predetermined direction and a weight body supported by the moving mechanism,
the center of gravity of the weight body moves in a direction approaching or separating from the center of the drawing tower along with the movement of the moving mechanism.
According to this configuration, the center of gravity of the weight provided in the applying mechanism moves in a direction approaching or separating from the center of the drawing tower with the movement of the moving mechanism. Thus, for example, by moving the moving mechanism according to the change with time of the first moment, the second moment can be changed with time by the movement of the moving mechanism.
In addition, in the optical fiber manufacturing apparatus according to one embodiment of the present disclosure,
(3) The wire drawing tower is provided with a grounding part which is grounded on the surface on which the wire drawing tower is arranged,
the center of gravity of the weight is located outside the outer periphery of the ground contact portion in a plan view.
According to this configuration, the second moment can be effectively applied to the drawing tower.
In addition, in the optical fiber manufacturing apparatus according to one embodiment of the present disclosure,
(4) The height of the position of the second torque applied to the drawing tower by the applying mechanism is more than 0.8 times of the height of the position of the drawing furnace.
When the height of the position where the second torque is applied to the wire drawing tower by the applying mechanism is smaller than 0.8 times the height of the position where the wire drawing furnace is located, the second torque cannot be effectively applied to the wire drawing tower, and therefore the first torque cannot be effectively offset by the second torque. Therefore, the height of the position where the second torque is applied to the drawing tower by the applying mechanism is preferably 0.8 times or more the height of the position of the drawing furnace.
In addition, in the optical fiber manufacturing apparatus according to one embodiment of the present disclosure,
(5) The height of the wire drawing furnace is more than 12 m.
Since the first moment is larger as the height of the position of the drawing furnace is larger, the effect of imparting the second moment to the drawing tower is higher, and particularly, in the case where the height of the position of the drawing furnace is 12m or more, the present disclosure is preferable.
In addition, an optical fiber manufacturing method according to an embodiment of the present disclosure includes:
(6) A step of spinning an optical fiber by heating an optical fiber base material with a drawing furnace mounted on a drawing tower to melt the optical fiber base material; and
and applying a second torque to the drawing tower while reducing the second torque as the optical fiber base material becomes smaller, the second torque being in a direction opposite to a direction in which the first torque applied to the drawing tower by the optical fiber base material acts.
According to this configuration, the second moment is applied to the drawing tower while the second moment is reduced as the base material becomes smaller, with respect to the second moment in the direction opposite to the direction in which the first moment applied to the drawing tower by the optical fiber base material acts, so that the deflection of the drawing tower can be suppressed.
In addition, in the optical fiber manufacturing method according to one embodiment of the present disclosure,
(7) The second moment is reduced by moving the center of gravity of the weight toward or away from the center of the drawing tower.
According to this configuration, the center of gravity of the weight body moves in a direction approaching or separating from the center of the drawing tower, so that the second moment can be changed with time.
In addition, in the optical fiber manufacturing method according to one embodiment of the present disclosure,
(8) In a plan view, the center of gravity of the weight body is moved further outside than the outer periphery of the grounding part of the drawing tower.
According to this configuration, the second moment can be effectively applied to the drawing tower.
In addition, in the optical fiber manufacturing method according to one embodiment of the present disclosure,
(9) And applying the second torque to the wire drawing tower at a position of 0.8 times or more the height of the wire drawing furnace.
In the case where the height of the second moment is smaller than 0.8 times the height of the drawing furnace, the second moment cannot be effectively applied to the drawing tower, and therefore the first moment cannot be effectively offset by the second moment. Therefore, the second moment is preferably applied to the wire drawing tower at a position of 0.8 times or more the height of the wire drawing furnace.
In addition, in the optical fiber manufacturing method according to one embodiment of the present disclosure,
(10) Spinning the optical fiber of 1000km or more on one base material while reducing the second moment.
The longer the fiber length of the optical fiber to be spun, the larger the optical fiber preform becomes, and the larger the first moment becomes. Thus, the longer the fiber length of the optical fiber to be spun, the higher the necessity of imparting a second torque to the drawing tower, especially in the case of spinning an optical fiber of a fiber length of 1000km or more, the present disclosure is preferred.
(details of embodiments of the present disclosure)
Specific examples of the optical fiber manufacturing apparatus according to the embodiments of the present disclosure are described below with reference to the drawings. It is to be noted that the present disclosure is not limited to these examples, but is represented by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.
(first embodiment)
An optical fiber manufacturing apparatus 1 according to the present embodiment will be described with reference to fig. 1. Fig. 1 is a schematic configuration diagram of an example optical fiber manufacturing apparatus 1. Fig. 1 illustrates a state immediately after the start of the drawing process.
As illustrated in fig. 1, the optical fiber manufacturing apparatus 1 includes: a drawing tower 2, a chuck 3, a control unit 4, a drawing furnace 5, an outer diameter measuring device 8, a forced cooling device 9, a coating device 10, a direct roller 11, a winding device 12, a feeding mechanism 13, and a capstan device 14. In the present embodiment, for convenience of explanation, the left-right direction in fig. 1 is referred to as an X-axis direction, a direction orthogonal to the X-axis direction in the horizontal direction is referred to as a Y-axis direction, the height direction (vertical direction in fig. 1) of the drawing tower 2 is referred to as a Z-axis direction, and the center position of the drawing tower 2 is referred to as a zero point of each axis.
The optical fiber manufacturing apparatus 1 includes a chuck 3 for holding a support rod 6a of an optical fiber base material 6 at an upper portion of a drawing tower 2. The chuck 3 is supported on the drawing tower 2 in a cantilever manner by the chuck support portion 3 a.
The drawing tower 2 may be disposed in a building, for example. The drawing tower 2 includes a grounding portion 21 that is grounded to the floor F (an example of a surface on which the drawing tower 2 is disposed) of the building. The drawing tower 2 is preferably independently built on the foundation without being connected to a building or the like surrounding it.
The chuck 3 is movable in the horizontal direction (X-axis direction, Y-axis direction). Thereby, the chuck 3 can horizontally adjust the position (holding position) of the support rod 6a holding the optical fiber base material 6. The chuck support portion 3a is slidable in the vertical direction (Z-axis direction) by a slide portion 3b provided in the upper portion of the drawing tower 2 in the up-down direction. Thus, after the chuck 3 is made to hold the support rod 6a, the chuck support portion 3a is made to slide downward, and the optical fiber preform 6 can be accommodated in the drawing furnace 5.
The control unit 4 controls the optical fiber manufacturing apparatus 1. For example, the control unit 4 controls the movement of the chuck 3 in the horizontal direction, and adjusts the position (gripping position) of the support rod 6a for gripping the optical fiber base material 6 in the horizontal direction. The control unit 4 measures or calculates the weight of the optical fiber preform 6. The weight may be measured by a weight or may be calculated from the diameter and length of the optical fiber base material 6. For example, the control unit 4 can calculate the weight of the optical fiber base material 6 by inputting a numerical value of the diameter and length of the optical fiber base material 6 to be drawn on a touch panel or the like (not shown) by an operator, or by sensing the diameter and length of the optical fiber base material 6 by a sensor (not shown). The control unit 4 calculates the moment applied to the drawing tower 2 and the deflection of the drawing tower 2 based on the calculated weight of the optical fiber base material 6.
The drawing furnace 5 is supported at the upper portion of the drawing tower 2. The height H of the position of the drawing furnace 5 (i.e., the height H from the ground F to the center portion of the drawing furnace 5 (intermediate position between the upper end portion and the lower end portion of the drawing furnace 5)) is 12m or more. The drawing furnace 5 includes a heater, and the optical fiber preform 6 accommodated therein is heated by the heater. The tip of the optical fiber preform 6 heated and melted in the drawing furnace 5 is drawn as an optical fiber 7.
The optical fiber preform 6 is formed of, for example, quartz glass. The optical fiber preform 6 has a predetermined weight.
The outer diameter measuring device 8 is a laser type measuring device, for example, provided below the drawing furnace 5. The outer diameter measuring device 8 measures the outer diameter of the optical fiber 7. The outer diameter measuring device 8 generates a control signal for controlling the driving of the capstan device 14 so that the outer diameter value of the optical fiber 7 measured by the outer diameter measuring device 8 at the time of drawing falls within a predetermined range, and transmits the control signal to the capstan device 14.
The forced cooling device 9 is formed with an insertion hole through which the high-temperature optical fiber 7 drawn by the drawing furnace 5 passes. By supplying the cooling gas into the forced cooling device 9, the forced cooling device 9 forcibly cools the optical fiber 7 inserted into the insertion hole.
The coating device 10 coats the optical fiber 7 cooled by the forced cooling device 9 with a resin. In the case where the resin is an ultraviolet curable resin, an ultraviolet irradiation device may be provided below the coating device 10 to irradiate the optical fiber 7 with ultraviolet rays to cure the resin. Then, after the resin is cured, the optical fiber 7 is wound up on the winding device 12 with a certain tension by the direct roller 11 and the capstan device 14. The capstan device 14 is controlled based on a control signal from the outer diameter measuring device 8, whereby the optical fiber 7 having a predetermined glass outer diameter is obtained.
However, since the chuck 3 is supported in a cantilever state with respect to the spin chuck 2, the spin chuck 2 is applied with the first moment M1 when the optical fiber preform 6 is supported by the chuck 3. At this time, the control unit 4 calculates a first moment M1 based on the following equation (1) based on the weight G1 of the optical fiber base material 6 and the distance D1 from the center of the optical fiber base material 6 to the center line CR of the drawing tower 2 (a is
Constant). M1=g1 d1+a … formula (1)
When a first moment M1 is applied to the wire drawing tower 2, the wire drawing tower 2 flexes. When the drawing tower 2 is flexed, the chuck 3 and the optical fiber preform 6 are inclined in the lower left direction in fig. 1. When the chuck 3 and the optical fiber base material 6 are tilted, the position where the drawn optical fiber 7 passes is shifted from the position of the path-line (path-line) aligned with the position, and as a result, the optical fiber 7 may come into contact with the forced cooling device 9 or the like, and a breakage may occur.
Accordingly, the inventors have studied a method for solving the above-described problems, and as a result, have found that the deflection of the wire drawing tower 2 can be suppressed by imparting the second moment M2 for canceling the first moment M1 to the wire drawing tower 2. Accordingly, the optical fiber manufacturing apparatus 1 according to the present embodiment includes the imparting mechanism 13 capable of imparting the second moment M2 to the drawing tower 2.
The imparting mechanism 13 is located opposite to the optical fiber base material 6 with respect to the center line CR of the drawing tower 2 on the X axis. The imparting mechanism 13 imparts a second moment M2 to the drawing tower 2 in a direction opposite to the direction in which the first moment M1 imparted to the drawing tower 2 by the optical fiber preform 6 acts. The applying mechanism 13 includes a plate-like portion 131, a moving mechanism 132, and a weight 133.
The plate-like portion 131 is a substantially rectangular plate member extending in the horizontal direction (X-axis direction, Y-axis direction), for example. The height H of the plate-like portion 131 (i.e., the height H from the floor surface F to the lower end portion of the plate-like portion 131) is preferably 0.8 times or more the height H of the wire drawing furnace 5.
The moving mechanism 132 moves in a predetermined direction, for example, in a direction approaching or separating from the center of the drawing tower 2 on the plate-like portion 131. The center of the drawing tower 2 is, for example, the center position P (the position of the zero point) of the three axes (X axis, Y axis, and Z axis) in the drawing tower 2. In the present embodiment, the moving mechanism 132 moves in the X-axis direction. The movement mechanism 132 is electrically connected to the control unit 4, for example, and moves based on an instruction signal from the control unit 4. However, the movement of the movement mechanism 132 may be realized by means other than such electrical control. For example, the movement mechanism 132 may be mechanically controlled to move to a desired position, or may be manually moved to a desired position by an operator. The movement mechanism 132 may be moved at all times or intermittently at predetermined time intervals.
The weight body 133 is, for example, a hammer having a predetermined weight. The weight of the weight body 133 can be arbitrarily set by an operator. The weight body 133 is supported by the moving mechanism 132. Therefore, when the moving mechanism 132 moves, the weight 133 moves with the movement of the moving mechanism 132. Accordingly, the center of gravity 133a of the weight body 133 moves in one direction of the X-axis direction (left-right direction in fig. 1) with the movement of the movement mechanism 132. That is, the center of gravity 133a of the weight body 133 moves in a direction approaching or separating from the center (position P) of the drawing tower 2. In the drawing, the center of gravity 133a of the weight body 133 is located outside the outer periphery of the ground contact portion 21 in a plan view. That is, in drawing, the center of gravity 133a of the weight body 133 is located outside the region V inside the drawing tower 2 in plan view.
The second moment M2 applied by the applying mechanism 13 configured as described above is calculated by the control unit 4 based on the total weight G2, which is the total of the weight of the moving mechanism 132 and the weight of the weight body 133, and the distance D2 from the center of gravity 133a of the weight body combined by the moving mechanism 132 and the weight body 133 to the center line CR of the drawing tower 2, based on the following equation (2) (B is a constant). M2=g2 d2+b … type (2)
Next, a method for manufacturing an optical fiber according to an embodiment of the present disclosure will be described with reference to fig. 1 to 2. Fig. 2 illustrates a state when a period of time has elapsed after the start of the drawing process. The optical fiber manufacturing method of the present embodiment is a method of manufacturing the optical fiber 7 by performing the following suspension step and drawing step using the optical fiber manufacturing apparatus 1 illustrated in fig. 1 to 2.
(suspension step)
The chuck support portion 3a is slid upward by the slide portion 3b, and the support rod 6a of the optical fiber base material 6 for drawing is held by the chuck 3. After the chuck 3 is made to hold the support rod 6a, the chuck support section 3a is made to slide downward, and the optical fiber preform 6 is suspended and accommodated in the drawing furnace 5.
(wire drawing step)
The optical fiber preform 6 accommodated in the drawing furnace 5 is heated by a heater. The tip of the optical fiber base material 6 is heated to a predetermined temperature (for example, 2000 ℃) to melt the optical fiber base material 6, and the glass gob at the tip is pulled down to draw the optical fiber base material. Then, drawing was performed while reducing the diameter of the glass. Then, as the drawing proceeds, the chuck support portion 3a is gradually slid downward, whereby the optical fiber 7 is drawn from the front end of the optical fiber base material 6.
In the optical fiber manufacturing apparatus 1, before drawing, it is necessary to align the chuck 3 with the position of the direct roller 11, the central axis of the drawing furnace 5, the forced cooling device 9, the coating device 10, and the like in advance, and to perform the positional alignment of the route through which the drawn optical fiber 7 passes. The alignment of the route is usually performed without suspending the optical fiber preform 6.
However, for the above reasons, when the optical fiber preform 6 is suspended, the position where the drawn optical fiber 7 passes is shifted from the position of the route line aligned with the position, and as a result, the optical fiber 7 may come into contact with the forced cooling device 9 or the like, and a breakage may occur.
Further, as illustrated in fig. 2, since the optical fiber base material 6 becomes smaller as drawing proceeds, the weight of the optical fiber base material 6 decreases as drawing proceeds. As illustrated in fig. 3, the weight of the optical fiber base material 6 is linearly proportional to the magnitude of the first moment M1. Therefore, the first moment M1 decreases as the wire drawing proceeds. Therefore, the inventors have noted that in order to suppress the deflection of the wire drawing tower 2, the second moment M2 may be given according to the first moment M1, and the second moment M2 may be changed in accordance with the change of the first moment M1.
Thus, the inventors have derived the following idea: by moving the moving mechanism 132 supporting the weight body 133, the second moment M2 is reduced in accordance with the reduction in weight of the optical fiber preform 6.
In the state illustrated in fig. 1, the control unit 4 calculates the first moment M1, calculates the distance D2 at which the first moment M1 and the second moment M2 are equal, and moves the movement mechanism 132 to a position corresponding to the distance D2.
When drawing is performed, the state illustrated in fig. 2 is obtained. In the state illustrated in fig. 2, the control unit 4 calculates a first moment m1. The first moment m1 is calculated based on the following equation (3) based on the weight g1 of the optical fiber base material 6 and the distance D1 from the optical fiber base material 6 to the center line CR of the drawing tower 2. The weight G1 is smaller than the weight G1. m1=g1 d1+a … (3)
The control unit 4 calculates the first moment m1, calculates a distance d2 where the first moment m1 and the second moment m2 are equal to each other, and moves the movement mechanism 132 to a position corresponding to the distance d2. The second moment m2 is calculated based on the formula (4) based on the total weight G2, which is the total of the weight of the moving mechanism 132 and the weight of the weight body 133, and the distance d2 from the center of gravity 133a of the weight body formed by combining the moving mechanism 132 and the weight body 133 to the center line CR of the drawing tower 2. m2=g2×d2+b … type (4)
Since the weight G1 is smaller than the weight G1, the first moment M1 is smaller than the first moment M1. Therefore, the second moment M2 must be smaller than the second moment M2, and the distance D2 is shorter than the distance D2. That is, as the weight of the optical fiber preform 6 decreases, the moving mechanism 132 approaches the center (position P) of the drawing tower 2.
In this way, the imparting mechanism 13 can reduce the second moment M2 as the weight of the optical fiber base material 6 becomes smaller. The second moment M2 may be continuously reduced by the applying mechanism 13, or the second moment M2 may be intermittently reduced at predetermined time intervals. The control is continued until the entire effective portion of the optical fiber preform 6 is drawn.
Further drawing is performed, and when the entire effective portion of the optical fiber base material 6 is drawn, the drawing is completed. In the optical fiber manufacturing method according to the present embodiment, a large-sized optical fiber preform 6 is used, and an optical fiber 7 of 1000km or more is spun on one optical fiber preform 6.
As described above, in the optical fiber manufacturing apparatus 1 and the optical fiber manufacturing method according to the present embodiment, the second torques M2 and M2 in the opposite directions to the directions in which the first torques M1 and M1 act are applied to the drawing tower 2 by the applying mechanism 13. The imparting mechanism 13 reduces the second moment M2 as the optical fiber base material 6 becomes smaller. Therefore, according to the optical fiber manufacturing apparatus 1 and the optical fiber manufacturing method according to the present embodiment, the bending of the drawing tower 2 can be suppressed.
In the present embodiment, the center of gravity 133a approaches the center (position P) of the wire drawing tower 2 with the movement of the movement mechanism 132, and therefore the second moment M2 can be reduced with time by the movement of the movement mechanism 132.
When the center of gravity 133a is located further inside than the outer periphery of the ground contact portion 21 in plan view, the distance from the weight body 133 to the center line CR cannot be obtained, and therefore the second moments M2, M2 cannot be effectively imparted to the wire drawing tower 2. However, in the present embodiment, the center of gravity 133a of the weight body 133 is located outside the outer periphery of the ground contact portion 21 in a plan view. Therefore, according to the optical fiber manufacturing apparatus 1 and the optical fiber manufacturing method according to the present embodiment, the second moments M2 and M2 can be effectively applied to the drawing tower 2.
(second embodiment)
Next, an optical fiber manufacturing apparatus 1A according to the present embodiment will be described with reference to fig. 4. In the description of the optical fiber manufacturing apparatus 1A, the same components as those of the optical fiber manufacturing apparatus 1 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.
Fig. 4 is a schematic configuration diagram of the optical fiber manufacturing apparatus 1A. The optical fiber manufacturing apparatus 1A is different from the optical fiber manufacturing apparatus 1 in that it further includes a chuck 30, a drawing furnace 50, an outer diameter measuring device 80, a forced cooling device 90, a coating device 100, a direct roller 110, a winding device 120, and a capstan device 140. The optical fiber manufacturing apparatus 1A is different from the optical fiber manufacturing apparatus 1 in that the adding mechanism 13 can move not only the weight body 133 to the right side of the drawing tower 2 in fig. 4 but also the weight body 133 to the left side of the drawing tower 2. Thus, the optical fiber manufacturing apparatus 1A is an optical fiber manufacturing apparatus having two drawing lines for one drawing tower. In the present embodiment, the control unit 4 controls the movement of the chuck 30 in the horizontal direction, and adjusts the position (gripping position) of the support rod 60a for gripping the optical fiber base material 60 in the horizontal direction. The control unit 4 measures or calculates the weight of the optical fiber preform 60.
The chuck 30 may have the same structure as the chuck 3. The structure from the drawing furnace 50 to the capstan device 140 may be the same as the structure from the drawing furnace 5 to the capstan device 14. However, in the state shown in fig. 4 of the present embodiment, the weight G3 of the optical fiber base material 60 is set smaller than the weight G1 of the optical fiber base material 6.
The chuck 30 includes: chuck support section 30a having the same structure as chuck support section 3a, and slide section 30b having the same structure as slide section 3 b. The chuck 30 holds a support rod 60a of an optical fiber base material 60 having the same structure as the optical fiber base material 6. Since the optical fiber preform 60 has a predetermined weight, when the optical fiber preform 60 is supported by the chuck 30, a third moment M3 in a direction opposite to the acting direction of the first moment M1 is applied to the drawing tower 2. The third moment M3 (C is a constant) is calculated based on the following equation (5) from the weight G3 of the optical fiber base material 60 and the distance D3 from the optical fiber base material 60 to the center line CR of the drawing tower 2. M3=g3×d3+c … type (5)
Since the weight G3 of the optical fiber base material 60 is smaller than the weight G1 of the optical fiber base material 6, the third moment M3 is smaller than the first moment M1. Therefore, in the present embodiment, the chuck 3 and the optical fiber preform 6 are inclined in the lower left direction in fig. 1, and as a result, the drawing tower 2 is deflected.
The control unit 4 calculates a distance D4 satisfying the following expression (6), and moves the movement mechanism 132 of the applying mechanism 13 to a position corresponding to the distance D4. The distance D4 is a distance from the center of the weight (center of gravity 133 a) formed by combining the moving mechanism 132 and the weight body 133 to the center line CR of the drawing tower 2. M1-m3=m2=g2×d4+b … (6)
When the movement mechanism 132 moves to the position corresponding to the distance D4, the first moment M1 is equal to the sum of the second moment M2 and the third moment M3, and therefore the deflection amount of the drawing tower 2 can be made substantially zero. In this way, even if the present disclosure is applied to the optical fiber manufacturing apparatus 1A having two drawing wires for one drawing tower, the same effects as those of the first embodiment can be obtained.
Next, an example of the present embodiment will be described. The present disclosure is not limited to the following examples.
The optical fiber 7 was spun using the optical fiber manufacturing apparatus 1 according to the present embodiment under various conditions different from each other, and the positional deviation of the drawing furnace 5 at the start and end of drawing and the positional deviation of the route line and the breakage frequency were compared.
Tables 1 and 2 show the positional shift of the wire drawing furnace 5 and the positional shift of the route line and the wire breakage frequency at the start and end of wire drawing under various conditions. The positional shift of the drawing furnace 5 at the start and end of drawing was good when the amount of shift was 3.0mm or less, and poor when it exceeded 3.0 mm. Therefore, the preferable range of the positional deviation of the drawing furnace 5 is 3.0mm or less. The positional deviation of the route line at the start and end of drawing is good when the deviation is 0.3mm or less, and poor when the deviation exceeds 0.3 mm. Therefore, a good range of the positional shift amount of the route line is 0.3mm or less. The disconnection frequency is good when it is not more than 0.1 piece/1000 km, and poor when it exceeds 0.1 piece/1000 km. Therefore, the good range of the disconnection frequency is 0.1 piece/1000 km or less. These are collectively judged for evaluation and are represented by three grades A, B, C. A is good, B is relatively good, and C is bad. The initial position of the moving mechanism 132 is a distance D2 from the center of gravity 133a to the center line CR of the wire drawing tower 2, and the end position of the moving mechanism 132 is a distance D2 from the center of gravity 133a to the center line CR of the wire drawing tower 2. The fiber length refers to the length of the optical fiber 7 spun from one optical fiber preform 6.
TABLE 1
TABLE 2
First, experimental examples 1 and 2 will be described. In experimental example 1, the distance D2 at the beginning of drawing and the distance D2 at the end of drawing were both 750mm. That is, in experimental example 1, the moving mechanism 132 did not move in the drawing step. On the other hand, in experimental example 2, the distance D2 at the start of drawing was 1304mm, but the distance D2 at the end of drawing was 754mm. That is, in experimental example 2, the moving mechanism 132 was moved so as to approach the center (position P) of the drawing tower 2 in the drawing step. Other parameters in experimental example 1 and experimental example 2 were the same.
In experimental example 1, since the positional deviation of the drawing furnace 5 at the start of drawing, the positional deviation of the route line at the start of drawing, and the disconnection frequency were out of the good ranges, the evaluation was set to C. On the other hand, in experimental example 2, since the positional deviation of the wire drawing furnace 5 at the start and end of wire drawing, the positional deviation of the route line, and the wire breakage frequency were all within good ranges, the evaluation was set to a. From experimental examples 1 and 2, it can be confirmed that: in the drawing step, when the moving mechanism 132 is moved so as to approach the center (position P) of the drawing tower 2, the positional displacement of the drawing furnace 5, the positional displacement of the route line, and the wire breakage frequency can be reduced.
Next, experimental examples 3 to 5 will be described. In experimental examples 3 to 5, the heights h of the positions of the plate-like portions 131 were different from each other. In addition, in experimental examples 3 to 5, the weights of the weight bodies were substantially equal to each other although they were different from each other. The initial position of the moving mechanism 132 and the end position of the moving mechanism 132 are each different. The other parameters in experimental examples 3 to 5 were the same. In any one of examples 3 to 5, the moving mechanism 132 was moved so as to approach the center (position P) of the drawing tower 2 in the drawing step. As shown in table 1, the height H of the plate 131 in experimental example 3 was 15.0m, which is 0.8 times the height H of the wire drawing furnace 5, that is, 16.8 m. On the other hand, the height H of the plate-like portion 131 in each of the experimental examples 4 to 5 was 18.0m and 18.5m, respectively, and thus was 0.8 times, that is, 16.8m higher than the height H of the wire drawing furnace 5.
In experimental example 3, the position of the moving body was changed to the maximum extent, and the positional deviation of the drawing furnace 5 at the start and end of drawing was within a good range, but the positional deviation of the route line and the disconnection frequency at the start and end of drawing were out of the good range. In particular, since the disconnection frequency largely falls out of the good range of the disconnection frequency, the evaluation is C. In experimental example 4, the positional deviation of the wire drawing furnace 5 at the start and end of wire drawing and the positional deviation of the route line at the end of wire drawing were both within good ranges, but the positional deviation of the route line at the start of wire drawing was slightly out of the good range, and the wire breakage frequency was out of the good range, so the evaluation was set as B. On the other hand, in experimental example 5, since the positional deviation of the wire drawing furnace 5 at the start and end of wire drawing, the positional deviation of the route line, and the wire breakage frequency were all within good ranges, the evaluation was set to a. Thus, from these examples, it can be confirmed that: when the height H of the plate-like portion 131 is smaller than 0.8 times the height H of the wire drawing furnace 5, the second moments M2 and M2 cannot be effectively applied to the wire drawing tower 2. In other words, it can be confirmed that: the height H of the plate 131 is preferably 0.8 times or more the height H of the wire drawing furnace 5.
Next, experimental examples 6 to 10 will be described. As shown in tables 1 and 2, in examples 6 to 10, the height H of the position of the drawing furnace 5, the height H of the position of the plate-like portion 131, the initial position of the moving mechanism 132, and the end position of the moving mechanism 132 were different from each other, but other parameters were the same. In addition, in the experimental examples 6 to 7 and 9, the moving mechanism 132 was not moved in the drawing step, but in the experimental examples 8 and 10, the moving mechanism 132 was moved so as to approach the center (position P) of the drawing tower 2 in the drawing step. In contrast to the height H of the position of the drawing furnace 5 in the experimental example 6 being 10.5m, that is, less than 12.0m, the height H of the position of the drawing furnace 5 in the experimental examples 7 to 10 was 12.0m or more.
In experimental example 6, since the positional deviation of the wire drawing furnace 5, the positional deviation of the route line, and the wire breakage frequency at the start and end of wire drawing were all within good ranges, the evaluation was set to a. On the other hand, in examples 7 and 9 in which the height H of the position of the drawing furnace 5 was higher than that of example 6, the evaluation was C because the position shift of the drawing furnace 5 at the start of drawing, the position shift of the route line, and the disconnection frequency were out of good ranges. In particular, in experimental example 9 in which the height H of the wire drawing furnace 5 was highest, the wire drawing furnace 5 was most displaced and the route was most displaced at the start of wire drawing, and the wire breakage frequency was also highest. Thus, it can be confirmed that: the higher the height H of the position of the wire drawing furnace 5, the higher the position shift of the wire drawing furnace 5 and the position shift of the route line and the higher the wire breakage frequency at the start of wire drawing. In experimental example 6, it was confirmed that: since the positional deviation of the drawing furnace 5 and the positional deviation of the route line at the start of drawing are already within good ranges, it is not necessary to move the moving mechanism 132 in the drawing process.
On the other hand, in example 8 in which only the initial position of the moving mechanism 132 and the end position of the moving mechanism 132 are different from example 7, and example 10 in which only the initial position of the moving mechanism 132 and the end position of the moving mechanism 132 are different from example 9, the positional deviation of the wire drawing furnace 5 at the start and end of wire drawing, the positional deviation of the route line, and the wire breakage frequency are all within good ranges, and therefore the evaluation is set to a. The higher the height H of the position of the drawing furnace 5, the more effectively the first moment M1 is applied to the drawing tower 2, but from these examples it can be confirmed that: when the height H of the position of the drawing furnace 5 is 12m or more, it is useful to apply the present disclosure.
Next, experimental examples 11 to 13 will be described. As shown in table 2, the initial position of the moving mechanism 132, the end position of the moving mechanism 132, the length of the optical fiber preform 6, and the fiber length are different from each other, but the other parameters are the same. In addition, in the experimental examples 11 to 12, the moving mechanism 132 was not moved in the drawing step, but in the experimental example 13, the moving mechanism 132 was moved so as to approach the center (position P) of the drawing tower 2 in the drawing step. In contrast to the fiber length of 788km, that is, less than 1000km in example 11, the fiber lengths of 1002km, that is, 1000km or more in example 12 and example 13.
In experimental example 11, since the positional deviation of the wire drawing furnace 5, the positional deviation of the route line, and the wire breakage frequency at the start and end of wire drawing were all within good ranges, the evaluation was set to a. On the other hand, in experimental example 12 in which the fiber length was longer than experimental example 11, the deviation of the position of the drawing furnace 5 at the start of drawing, the deviation of the position of the route line, and the frequency of disconnection were out of the good ranges, and therefore the evaluation was set to C. Thus, it can be confirmed that: the longer the fiber length is, the more the positional deviation of the drawing furnace 5 and the positional deviation of the route line are increased at the start of drawing. In experimental example 11, it was confirmed that: since the positional deviation of the drawing furnace 5 and the positional deviation of the route line at the start of drawing are already within good ranges, it is not necessary to move the moving mechanism 132 in the drawing process.
On the other hand, in experimental example 13 in which only the initial position of the moving mechanism 132 and the end position of the moving mechanism 132 were different from experimental example 12, the position shift of the drawing furnace 5 at the start and end of drawing and the position shift of the route line and the breaking frequency were both in good ranges, and therefore the evaluation was set to a. The longer the fiber length of the optical fiber 7 to be spun, the larger the optical fiber preform 6, the larger the first moment M1, but from these examples, it can be confirmed that: application of the present disclosure is useful when the fiber length is 1000km or more.
The present disclosure has been described in detail with reference to specific embodiments, but it will be apparent to one skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the disclosure. The number, position, shape, and the like of the constituent members described above are not limited to the above-described embodiments, and may be changed to the number, position, shape, and the like preferable in implementing the present disclosure.
In the second embodiment, the optical fiber manufacturing apparatus 1A has the configuration including only the control unit 4, but may further include a control unit 40 having the same hardware configuration as the control unit 4.
In the above embodiment, the center of gravity 133a moves so as to approach the center (position P) of the wire drawing tower 2 with the movement of the moving mechanism 132, but may also move so as to be away from the center of the wire drawing tower 2. For example, when a new optical fiber base material 6 is attached after drawing of the effective portion of the optical fiber base material 6 is completed, it is preferable to move the center of gravity 133a away from the center of the drawing tower 2.
In the above embodiment, the moving mechanism 132 moves in the X-axis direction, but may also move in the Y-axis direction or the Z-axis direction.
In the above embodiment, the second moment is controlled by the movement of the movement mechanism 132 by the applying mechanism 13, but the second moment may be controlled by changing the weight of the applying mechanism 13. For example, the weight of the applying mechanism 13 may be changed by placing a liquid or the like in a container provided in the applying mechanism 13 and discharging the liquid from the container little by little as the drawing proceeds.
In the above-described embodiment, the optical fiber manufacturing apparatus having one or two draw wires for one drawing tower was described, but the present disclosure may be applied to an optical fiber manufacturing apparatus having three or more draw wires for one drawing tower, and the like.
In the above embodiment, the wire drawing furnace was used, but the present disclosure may be applied to a resistance furnace, an induction heating furnace, or the like.
Description of symbols
1. 1A: optical fiber manufacturing apparatus
2: wire drawing tower
3. 30: chuck
3a, 30a: chuck support
3b, 30b: sliding part
4. 40: control unit
5. 50: wire drawing furnace
6. 60: optical fiber base material
6a, 60a: support bar
7: optical fiber
8. 80: external diameter measuring device
9. 90: forced cooling device
10. 100: coating device
11. 110: direct roller
12. 120: coiling device
13: mechanism for applying
14. 140: winch device
21: grounding part
131: plate-like portion
132: moving mechanism
133: weight body
133a: center of gravity
CR: center line
D1, D2, D3, D2: distance of
F: ground surface
H. h: height of (1)
M1, M1: first moment of force
M2, M2: second moment of force
M3: third moment of force
P: position of
V: region(s)
Claims (10)
1. An optical fiber manufacturing apparatus includes:
a wire drawing tower;
a drawing furnace mounted on the drawing tower for heating the optical fiber preform to melt the optical fiber preform and spinning the optical fiber; and
a second torque imparting mechanism mounted on the drawing tower and imparting a second torque to the drawing tower in a direction opposite to a direction in which the first torque imparted to the drawing tower from the optical fiber base material acts,
the imparting mechanism may reduce the second moment as the optical fiber preform becomes smaller.
2. The optical fiber manufacturing apparatus according to claim 1, wherein,
the applying mechanism is provided with a moving mechanism capable of moving in a predetermined direction and a weight body supported by the moving mechanism,
the center of gravity of the weight body moves in a direction approaching or separating from the center of the drawing tower along with the movement of the moving mechanism.
3. The optical fiber manufacturing apparatus according to claim 2, wherein,
the wire drawing tower is provided with a grounding part which is grounded on the surface on which the wire drawing tower is arranged,
the center of gravity of the weight is located outside the outer periphery of the ground contact portion in a plan view.
4. The optical fiber manufacturing apparatus according to any one of claim 1 to claim 3, wherein,
the height of the position of the second torque applied to the drawing tower by the applying mechanism is more than 0.8 times of the height of the position of the drawing furnace.
5. The optical fiber manufacturing apparatus according to any one of claims 1 to 4, wherein,
the height of the wire drawing furnace is more than 12 m.
6. A method of manufacturing an optical fiber, comprising:
a step of spinning an optical fiber by heating an optical fiber base material with a drawing furnace mounted on a drawing tower to melt the optical fiber base material; and
and applying a second torque to the drawing tower while reducing the second torque as the optical fiber base material becomes smaller, the second torque being in a direction opposite to a direction in which the first torque applied to the drawing tower by the optical fiber base material acts.
7. The optical fiber manufacturing method according to claim 6, wherein,
the second moment is reduced by moving the center of gravity of the weight toward or away from the center of the drawing tower.
8. The optical fiber manufacturing method according to claim 7, wherein,
in a plan view, the center of gravity of the weight body is moved further outside than the outer periphery of the grounding part of the drawing tower.
9. The optical fiber manufacturing method according to any one of claims 6 to 8, wherein,
and applying the second torque to the wire drawing tower at a position of 0.8 times or more the height of the wire drawing furnace.
10. The optical fiber manufacturing method according to any one of claims 6 to 9, wherein,
spinning the optical fiber of 1000km or more on one optical fiber base material while reducing the second moment.
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| JP2021110795 | 2021-07-02 | ||
| JP2021-110795 | 2021-07-02 | ||
| PCT/JP2022/025999 WO2023277076A1 (en) | 2021-07-02 | 2022-06-29 | Optical fiber production device and optical fiber production method |
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| JP (1) | JPWO2023277076A1 (en) |
| CN (1) | CN117412933A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2146321B (en) * | 1983-09-03 | 1988-05-05 | Stc Plc | Optical fibre pulling tower |
| EP1706766B1 (en) * | 2003-12-30 | 2009-04-22 | Prysmian S.p.A. | Low polarisation mode dispersion (pmd) optical fiber link, and method of making the same |
| EP1749229B1 (en) * | 2004-05-24 | 2009-04-29 | Prysmian S.p.A. | Process and apparatus for manufacturing an optical cable |
| FR2967155B1 (en) * | 2010-11-08 | 2017-12-15 | Delachaux Sa | IMPROVED OPTICAL FIBER GUIDING DEVICE |
| JP2013220972A (en) * | 2012-04-17 | 2013-10-28 | Sumitomo Electric Ind Ltd | Method for manufacturing optical fiber |
| JP2016079059A (en) * | 2014-10-15 | 2016-05-16 | 住友電気工業株式会社 | Method and apparatus for manufacturing optical fiber |
| JP6638346B2 (en) * | 2015-11-17 | 2020-01-29 | 住友電気工業株式会社 | Optical fiber manufacturing apparatus and optical fiber manufacturing method |
| JP7155075B2 (en) * | 2019-07-31 | 2022-10-18 | 株式会社フジクラ | Optical fiber manufacturing method |
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- 2022-06-29 JP JP2023532026A patent/JPWO2023277076A1/ja active Pending
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