WO2017185903A1 - Optical fiber preform loose mass deposition device and deposition method therefor - Google Patents

Abstract

An optical fiber preform loose mass deposition device and a deposition method therefor. The deposition device comprises a tank, blowtorches distributed in a RxC matrix, a blowtorch translation motor, a blowtorch translation platform, a number C of target bars, a number C of lead rods, a number C of sensors, a number C of rotary motors, a lifting platform, and a lifting motor, wherein the number C of target bars are arranged in a first direction and are located above corresponding first blowtorches, and the extension direction of each target rod is arranged in correspondence with the first blowtorch of each row in the first direction.

Description

Optical fiber prefabricated loose body deposition device and deposition method thereof Technical field

The invention belongs to the technical field of optical fiber preform manufacturing, and in particular relates to an optical fiber prefabricated loose body deposition device and a deposition method thereof.

Background technique

Existing optical fiber preform manufacturing method, the first step: the use of axial vapor deposition (VAD) to produce mandrel, the second step: the use of external vapor deposition (OVD) to produce the outer cladding, through these two methods to produce optical fiber prefabrication Baton. As we all know, 70% of the cost of fiber prefabrication is determined by the cladding part. The production cost and production efficiency of the OVD method have a great influence on the cost of the optical fiber preform.

At present, the OVD method for producing loose preforms of optical fiber preforms is generally a single set of torches for round-trip deposition. The number of deposition torches in this method is not more than three. If the number of burners is increased only in the original equipment, the single-group torch round-trip deposition method will increase the number of lamps. The length of the tapered portion of the preform loose body reduces the effective length of the fiber preform loose.

1 is a schematic structural view of a conventional single-group blower optical fiber prefabricated loose body deposition apparatus. The deposit includes: a casing 1, a loose body located in the casing 1, a chuck 3 for fixing the loose body 2, and a chuck. 3 connected sensors 4, 3 burners 5 located in the casing 1, a burner stage 6 for fixing the burner 5, a torch lifting motor 7 fixing the burner stage 6, a rotary motor 8 for fixing the loose body 1, and a rotary driving of the burner Motor 9.

A target rod with a target weight of 100 kg is mounted on the chuck 3 in the casing 1, and the flow rate of each burner is adjusted to an average CH ₄ : 72 slpm; SiCl ₄ : 42.7 g / min 02: 149 slpm, after the deposition is started, the torch is shifted. The motor 9 drives the burner 5 on the burner stage 6 to move, the rotary motor 8 drives the target rod to rotate, and the single set of 3 burners continuously moves back and forth to deposit SiO ₂ onto the target rod to form the loose body 2. During the deposition process, the sensor 4 records the loose body from time to time. The deposition weight is compared with the target weight. When the re-deposition weight reaches the apparent weight, the line gives an engineering end indication. As the outer diameter of the loose body 2 increases, the torch lifting motor 7 drives the stage to make the burner loose. The direction moves, and the deposition weight reaches the target weight and the project ends.

The main parameters of the sedimentation measured by loose bulk are as follows:

Stick number Deposition rate g/min Raw material utilization% Density g/cm ³ Gas consumption m ³ 1 30 65 0.58 960

Table 1

The space in which technology now reduces production costs and increases production efficiency cannot be accomplished by adding blowtorches.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical fiber preformed loose body deposition apparatus and a deposition method thereof which improve production efficiency and deposition speed.

The invention provides an optical fiber prefabricated loose body deposition device, which comprises: a box body, an R×C matrix distribution blower fixed in the box body, a blower translation motor and a torch translation stage connected to the R×C matrix distribution burner lamp, and deposition C target rods of C loose bodies, C lead rods correspondingly connected to the C target rods, C sensors connected to the C lead rods, and C rotating electric machines connected to the C lead rods a lifting stage for fixing the C rotating electric machines, and a lifting motor connected to the lifting stage; wherein R and C are both natural numbers; setting the R×C matrix distribution burners in the first direction and the first direction The vertical second direction matrix is arranged, the first burner is set in the first direction, the second burner is set in the second direction, and the first burner in the first direction has the C row. There are R first burners; the second burner in the second direction has R rows, and each row is provided with C second burners; the C target rods extend along the first direction and are located above the corresponding first burners And each target rod extends in the same direction as the first direction A blower lamp corresponds to the setting.

Preferably, 4≤R≤12, 1≤C≤6, and R≥C.

Preferably, the R×C matrix distribution burner is provided with a support plate for fixing the R×C burners, one end of each burner is fixed on the support plate, and the other end of each burner is fixed in the casing.

Preferably, the support plates are fixedly connected to the burner translation motor and the burner translation stage.

Preferably, one end of each lead rod passes through the lifting stage and is connected to a corresponding sensor, and the other end of each lead rod is fixedly connected to the corresponding target rod.

The invention also provides a method for depositing an optical fiber prefabricated loose body, comprising the following steps:

The first step: the R×C matrix distribution burner is fixed in the box;

The second step: the C target rods are respectively mounted on the corresponding lead rods in the first direction;

The third step: C rods, sensors and rotating electric machines with target rods are mounted on the lifting platform;

The fourth step: C rotating electric machines drive the corresponding target rods to rotate by the lead rods, and the R×C matrix distribution burners continuously deposit SiO ₂ onto the target rods to form corresponding loose bodies;

Step 5: During the deposition process, the sensor records the deposition weight of the corresponding loose body;

Step 6: As the outer diameter of the loose body increases, the blowtorch translation motor drives the R×C matrix distribution blower through the blower lamp to continuously move away from the loose body, so that the distance from the burner to the deposition point remains substantially constant.

Preferably, the method further comprises the following steps: Step 7: The sensor performs on-line measurement of the deposition weight and compares the deposition progress of the C loose bodies.

Preferably, the method further comprises the following steps: Step 8: When the sensor measures the weight of the C loose bodies to reach the target weight, the deposition method automatically ends the knot.

Preferably, the method further comprises the following steps: the sensor performs the R×C matrix distribution of the flow rate of the blowtorch material according to the progress difference, and the adjustment mode is that the deposition of the raw material with a fast deposition is reduced, so that the C loose bodies simultaneously reach the target weight.

Preferably, the target weight of the loose bodies deposited on the C target rods does not differ by more than ±0.5%.

The tank of the invention can deposit C loose bodies, and 3×(C-1) servo motors can be used less than the conventional method, and the inner and outer isolation gases of the same row of the burners in the spray lamp matrix distribution can share one mass flowmeter. Therefore, 2×R×(C-1) mass flowmeters can be saved; since a box body is simultaneously produced with loose C, the deposition atmosphere temperature in the tank can be increased by 20-30 ° C, thereby saving gas consumption; The matrix distribution method greatly improves the production efficiency of the equipment, and the deposition speed is RC times that of the single burner.

DRAWINGS

1 is a schematic structural view of a conventional single-group blower optical fiber prefabricated loose body deposition device;

2 is a schematic structural view of a pre-fabricated loose body deposition device for a burner lamp matrix distribution optical fiber according to the present invention.

Description of the figure:

10-Box, 20-R×C Matrix Distribution Blowtorch, 21-R Series Blowtorch, 22-C Series Blowtorch, 30-Blowing Lamp Translation Motor, 40-Blowing Lamp Translation Stage, 50-Loose Body, 60-Pole, 70 - Sensor, 80-rotary motor, 90-lifting platform, 100 lifting motor, 200-target bar.

detailed description

The invention provides an optical fiber prefabricated loose body deposition device, which can be used for producing an optical fiber preform loose body or a silicone combustion deposition to produce an optical fiber preform loose body by SiCl ₄ hydrolysis deposition.

Referring to FIG. 1 , the deposition apparatus comprises: a box body 10 , an R×C matrix distribution blower 20 fixed in the box 10 , a blower translation motor 30 connected to the R×C matrix distribution blower 20 and a blower translation load. The stage 40 and the C target rods 200, the C lead rods 60 connected to the C target rods 200, and the C sensors 70 connected to the C rods 60 are connected to the C rods 60. C rotating electric machines 80, a lifting stage 90 that fixes the C rotating electric machines 80, and a lifting motor 100 connected to the lifting stage 90. Wherein, 4≤R≤12, 1≤C≤6, R≥C; the lead rod 60 is fixed on the lifting platform 90; the sensor 70 is a weight sensor; one end of each lead rod 60 is worn The lifting platform 90 is fixedly connected to the corresponding sensor 70, and the other end of each of the guiding rods 60 is fixedly connected to the corresponding target rod 200.

With the present optical fiber prefabricated loose bulk deposition apparatus, the R x C matrix distribution burner 20 continuously deposits SiO ₂ onto the target rod 200 while forming C loose bodies 50.

Setting the R×C matrix distribution burners to be arranged in a first direction and a second direction matrix perpendicular to the first direction, and the first direction in the first direction is called a first burner 21, and is located in a second direction perpendicular to the first direction. For the second burner 22, that is, the first burner 21 in the first direction has a total of C rows, each row is provided with R first burners 21; the second burner 22 in the second direction has a total of R rows, each row has C first Two burners 21.

The R×C matrix distribution burner 20 is provided with a support plate 23 for fixing the R×C burners. One end of each burner is fixed on the support plate 23, and the other end of each burner is fixed in the casing 10. The support plate 23 is fixedly connected to the blower translation motor 30 and the blower translation stage 40, so that the R×C matrix distribution blower 20 is fixedly connected to the blower translation motor 30 and the blower translation stage 40.

In this embodiment, there are 12 first burners 21 in each row in the first direction, and 3 second burners 22 in each row in the second direction, that is, the R×C matrix distribution burner 20 adopts 12×3 or 36 The blowtorch matrix is distributed. The flow rate of each burner was adjusted to an average CH4: 40 slpm; OMCTS: 17 g/min 02: 100 slpm; N2: 15 slpm.

Each target rod 200 extends in the first direction and is located above the corresponding first burner 21, and the direction of extension of each target rod 200 is corresponding to each row of first burners in the first direction.

In the present invention, C target rods 200 are provided, that is, three target rods 200 are provided.

Three target rods 200 each having a target weight of 100 kg are attached to the corresponding lead rods 60, respectively.

After the deposition is started, the lifting motor 100 drives the lifting platform 90, and the corresponding target rod 200 is pulled up and down by the lead rod 60. The three rotating electric machines 80 drive the target rod 200 to rotate at the same rotational speed, and the 12×3 matrix burner continuously deposits SiO _{2 .} A corresponding loose body 50 is formed on the target rod 200; during the deposition process, the sensor 70 records the deposition weight of the corresponding loose body 50 from time to time, and compares the PID adjustment to the flow rate of the array burner material to ensure the same progress of the loose body 50 deposition, with 3 As the outer diameter of the root loose body 50 increases, the matrix blower translation motor 30 drives the burner to translate the stage 40 to move the burner away from the loose direction, and the deposition weight reaches the target weight and the project ends.

The optical fiber prefabricated loose body deposition method comprises the following steps:

The first step: the R x C matrix distribution burner 20 is fixed in the casing 10.

The second step: the C target rods 200 are respectively mounted on the corresponding lead rods 60 in the first direction.

The third step: C guides 60 with the target rod 200, the sensor 70, and the rotary electric machine 80 are mounted on the lift stage 90.

The fourth step: C rotating electric machine 80 drives the corresponding target rod 200 to rotate by the lead rod 60, and the R×C matrix distribution burner 20 continuously deposits SiO ₂ onto the target rod 200 to form a corresponding loose body 50;

Step 5: During the deposition process, the sensor 70 records the deposition weight of the corresponding loose body 50 from time to time.

Step 6: As the outer diameter of the loose body 50 continues to increase, the burner translation motor 30 drives the R x C matrix distribution burner 20 through the burner translation stage 40 to keep away from the loose body 50, so that the distance from the burner to the deposition point remains substantially constant.

Step 7: The sensor 70 performs on-line measurement of the deposition weight and compares the deposition progress of the C loose bodies 50, and performs PID adjustment of the raw material flow rate of the R×C matrix distribution blower 20 according to the progress difference, and the adjustment mode is a fast deposition of raw material supply. Reduce, and finally make the C loose bodies reach the target weight at the same time.

Step 8: When the sensor 70 measures the weight of the corresponding loose body to reach the target weight, the deposition method automatically ends.

The target weight difference of the loose bodies deposited on the C target rods does not exceed ±0.5%.

The main parameters of the deposition of loose bodies are measured, as shown in Table 2 below:

Stick number Deposition rate g/min Raw material utilization% Density g/cm ³ Gas consumption m ³ 1 120.1 70 0.67 433.3 2 119.9 69.9 0.6 424.4 3 120 70 0.67 433.3 total 36. - - 1291.0 average 120 70 0.67 430

Table 2

The invention not only affects the mass of the optical fiber preform loose body, but also deposits the matrix by spray lamp, increases the number of blow lamps to R×C (4≤R≤12,1≤C≤6), and simultaneously produces C fiber preforms. The rod loose body makes the deposition efficiency RC times of the single lamp. Since the same box produces multiple loose bodies, the equipment is saved to save the box and 3C motors, and the gas can be saved under the condition of loose parts with the same specifications. The device can be used for SiCl. ₄ Hydrolytic deposition to produce optical fiber preformed loose bodies or silicone combustion deposition to produce optical fiber preform loose bodies.

The tank of the invention can deposit C loose bodies, and 3×(C-1) servo motors can be used less than the conventional method, and the inner and outer isolation gases of the same row of the burners in the spray lamp matrix distribution can share one mass flowmeter. Therefore, 2 × R × (C-1) mass flow meters can be saved. Since a box can produce C loose at the same time, it can make the sink in the box The atmosphere temperature is 20 to 30 ° C, which can save gas consumption. The torch matrix distribution method greatly improves the production efficiency of the device, and the deposition speed is RC times that of the single burner.

The preferred embodiments of the present invention have been described above with reference to the drawings, and the present invention can be implemented in various modifications without departing from the scope and spirit of the invention. For example, features illustrated or described as part of one embodiment can be used in another embodiment to yield a further embodiment. The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. The equivalents of the present invention and the accompanying drawings are included in the scope of the present invention.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details in the above embodiments, and various equivalent transformations may be made to the technical solutions of the present invention within the scope of the technical idea of the present invention. It belongs to the scope of protection of the present invention.

Claims (10)

An optical fiber prefabricated loose body deposition device, comprising: a box body, an R×C matrix distribution blower fixed in the box body, a blower shifting motor and a blower shifting stage connected to the R×C matrix distributed blowtorch, C target rods for depositing C loose bodies, C lead rods correspondingly connected to the C target rods, C sensors correspondingly connected to the C lead rods, and C rotations corresponding to the C lead rods a motor, a lifting stage for fixing the C rotating electric machines, and a lifting motor connected to the lifting stage; wherein R and C are both natural numbers; setting the R×C matrix distribution lamp in the first direction and the first a second direction matrix arranged in a vertical direction, a first burner located in a first direction, a second burner located in a second direction, and a first burner in a first direction having a C row, each row Providing R first burners; the second burner in the second direction has R rows, each row is provided with C second burners; the C target rods are extended along the first direction and are located in the corresponding first burners Above, and each target rod extends in a direction with each row in the first direction The first burner corresponds to the setting. The optical fiber preformed loose body deposition apparatus according to claim 1, wherein 4 ≤ R ≤ 12, 1 ≤ C ≤ 6, and R ≥ C. The optical fiber prefabricated loose body deposition apparatus according to claim 1, wherein the R×C matrix distribution burner is provided with a support plate for fixing the R×C burners, and one end of each burner is fixed on the support plate. The other end of each burner is fixed in the cabinet. The optical fiber prefabricated loose body deposition apparatus according to claim 3, wherein the support plates are fixedly connected to the burner translation motor and the burner translation stage. The optical fiber prefabricated loose body deposition apparatus according to claim 1, wherein one end of each of the lead rods passes through the lifting stage and is connected to a corresponding sensor, and the other end of each of the lead rods is fixedly connected to the corresponding target rod. The optical fiber preformed loose body deposition method according to any one of claims 1 to 5, characterized in that it comprises the following steps: The first step: the R×C matrix distribution burner is fixed in the box; The second step: the C target rods are respectively mounted on the corresponding lead rods in the first direction; The third step: C rods, sensors and rotating electric machines with target rods are mounted on the lifting platform; The fourth step: C rotating electric machines drive the corresponding target rods to rotate by the lead rods, and the R×C matrix distribution burners continuously deposit SiO ₂ onto the target rods to form corresponding loose bodies; Step 5: During the deposition process, the sensor records the deposition weight of the corresponding loose body; Step 6: As the outer diameter of the loose body increases, the blowtorch translation motor drives the R×C matrix distribution blower through the blower lamp to continuously move away from the loose body, so that the distance from the burner to the deposition point remains substantially constant. The optical fiber preformed loose body deposition method according to claim 6, further comprising the steps of: Step 7: The sensor measures the sediment weight online and compares the progress of the deposition of C loose bodies. The optical fiber preformed loose body deposition method according to claim 7, further comprising the steps of: Step 8: When the sensor measures the weight of the C loose bodies to reach the target weight, the deposition method automatically ends the knot. The optical fiber preformed loose body deposition method according to claim 7, further comprising the steps of: The sensor adjusts the R×C matrix distribution of the raw material flow rate of the burner according to the progress difference. The adjustment method is that the deposition of the raw material is reduced, so that the C loose bodies reach the target weight at the same time. The optical fiber preformed loose body deposition method according to claim 6, wherein the target weight difference of the loose bodies deposited on the C target rods does not exceed ±0.5%.

Images