CN214299888U

CN214299888U - Effective deposition control system of optical fiber perform surrounding layer

Info

Publication number: CN214299888U
Application number: CN202023119842.9U
Authority: CN
Inventors: 沈小平; 陈尚加; 朱陈明; 谷东东; 王祥; 王樯
Original assignee: Tongding Interconnection Information Co Ltd
Current assignee: Tongding Interconnection Information Co Ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2021-09-28
Anticipated expiration: 2030-12-23

Abstract

The utility model relates to an effective deposit control system of optical fiber perform surrounding layer, including the correlation formula laser sensor who is used for producing laser light curtain and detects optical fiber perform SOOT surrounding layer position, blowtorch platform both sides set up the laser instrument installing support, and correlation formula laser sensor fixes on the laser instrument installing support. The correlation laser sensor is interlocked with a servo motor of an upper driving mechanism and a lower driving mechanism of a blowtorch platform, and the distance between the blowtorch and the SOOT outer cladding layer of the optical rod preform is kept at the optimal collection distance through PID control. The utility model discloses when optical fiber perform SOOT diameter grow, PID control system utilizes the position signal of laser sensor feedback, and its up-and-down motion's of its continuous adjustment of control blowtorch platform is controlledSpeed to make the edge of preform SOOT semi-finished product to the burner in the optimum collecting position, thereby increasing SiO₂The collecting efficiency, the process time is shortened, the equipment load is reduced, and the production cost is reduced.

Description

Effective deposition control system of optical fiber perform surrounding layer

Technical Field

The utility model belongs to the technical field of optical fiber perform preparation, concretely relates to effective deposit control system of optical fiber perform surrounding layer.

Background

The optical fiber preform is the most main and key raw material in the optical fiber drawing process and consists of a core rod and an outer cladding layer. Currently, the manufacturing of the optical fiber preform can be realized by a total synthesis process method, namely a VAD + OVD combined production process, wherein the VAD process mainly produces a core rod, and an outer cladding layer is deposited on the surface of the core rod through the OVD process to efficiently produce the optical fiber preform.

As shown in fig. 1, the OVD equipment structure includes an equipment body 2, in which a torch platform 2, a torch platform up-down, left-right driving mechanism, a mandrel rotation, air supplement, cooling, weighing and other mechanisms are arranged. The blast lamp platform 2 is provided with a blast lamp and various raw material pipelines. The OVD process deposition process is a process of generating a silicon dioxide particle product by oxidizing hydrolysis reaction through the blowout of a blowtorch after raw material gases such as methane, oxygen, silicon tetrachloride and the like are combusted, and is an optical fiber preform production process which is adsorbed on a core rod which rotates continuously under the action of external environments such as air draft (an air draft interface 1 is arranged on an equipment body 2 and connected with external air draft equipment) and air supplement. As shown in fig. 2, the distance from the burner to the outer cladding of the preform at which the silica particles are most efficiently collected is referred to as an optimal collection distance D under the same external conditions. The existing OVD process equipment carries out mechanical control of the up-and-down operation of a blowtorch platform according to a formula led in before deposition, theoretically leads the outer cladding of the prefabricated rod to be positioned at the optimal deposition distance of the blowtorch for deposition, but actually does not consider the fluctuation of the collection capacity of the outer cladding of the prefabricated rod caused by the change of parameters such as cavity temperature, air draft pressure, air supply quantity, methane, oxygen, silicon tetrachloride reaction generated silicon dioxide quantity and the like in the deposition process, thus leading the outer cladding deposited to be not deposited at the optimal depositionIn distance, resulting in SiO in the whole process₂The actual collection efficiency of (2) reduces, extravagant raw and other materials, and then leads to actual deposit production time extension, has increased the condemned probability of optical fiber perform SOOT (semi-manufactured goods), has also increased the load of peripheral exhaust-gas treatment equipment and deposit production facility simultaneously, has also increased the maintenance cost of guarantor of equipment, is unfavorable for the reduction of cost. In the actual production process, in order to avoid the problems, the formula is continuously optimized according to the process data of the previous batches of production to improve the collection efficiency, the method has certain feasibility but has higher requirements on process personnel, higher professional level is required, a large amount of data processing capacity is required, and the production equipment is more, the workload is high, and errors are easy to occur.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to the SiO that the prefabricated stick surrounding layer of optic fibre is not collecting the distance at the torch best and leads to₂Low collection efficiency and long process time. The utility model relates to an effective deposit control system of prefabricated excellent surrounding layer of optic fibre and control method guarantees that prefabricated excellent surrounding layer deposit surface is on the best collection position of blast burner all the time to let SiO2 collection efficiency maximize, reduce process time.

The utility model discloses the technical scheme who adopts does:

an effective deposition control system for an outer cladding layer of an optical fiber preform comprises a correlation type laser sensor used for generating a laser light curtain and detecting the position of the SOOT outer cladding layer of the optical fiber preform, laser installation supports are arranged on two sides of a blast lamp platform, and the correlation type laser sensor is fixed on the laser installation supports; the correlation laser sensor is interlocked with a servo motor of an upper driving mechanism and a lower driving mechanism of a blowtorch platform, and the distance between the blowtorch and the SOOT outer cladding layer of the optical fiber perform is kept at the optimal collection distance through PID control.

An effective deposition control method for an outer cladding layer of an optical fiber preform comprises the following steps:

theoretically, the optimal collection distance D is the unobstructed distance D1+ the distance D2 from the torch to the lowest end of the light curtain of the correlation laser sensor;

during production, the core rod rotates, and under the action of air draft, silica particles generated by the blowtorch are continuously adsorbed on the surface of the core rod, so that the diameter of the silica particles is continuously enlarged; the unblocked distance D3 actually measured by the laser light curtain changes constantly, at the moment, the unblocked distance D3+ actually measured by the laser light curtain and the distance D2 from the blowtorch to the lowest end of the light curtain of the correlation laser sensor are the actual collection distance D4, the unblocked distance D3 actually measured by the laser light curtain is fed back to the PID control system, the movement of the blowtorch platform is controlled, the actual measured unblocked distance D3 is equal to the unblocked distance D1 of the light curtain of the correlation laser sensor as much as possible, the actual collection distance D4 is equal to the optimal collection distance D as much as possible, and the optimal collection state is maintained.

Further, the distance D1 that is not blocked by the light curtain of the correlation laser sensor and the distance D3 that is not blocked by the actual measurement of the laser light curtain are calculated according to the percentage position fed back by the correlation laser sensor and by combining the width of the laser light curtain.

The beneficial effects of the utility model reside in that:

the utility model discloses the utilization is installed in the position of initial plug surface for the blowtorch platform is confirmed to the correlation formula laser sensor of blowtorch platform both sides, in the production process, optical fiber perform SOOT semi-manufactured goods (the initial plug that is) is rotatory always, under convulsions and blowtorch flame effect, the continuous deposit grow of its diameter, in the diameter grow, PID control system utilizes the position signal of laser sensor feedback, the speed of its up-and-down motion is constantly adjusted to control blowtorch platform (mainly downwards), make the edge of perform SOOT semi-manufactured goods be in the best to the blowtorch and collect the position, thereby improve SiO₂The collecting efficiency, the process time is shortened, the equipment load is reduced, and the production cost is reduced.

Drawings

FIG. 1 is a schematic structural diagram of an OVD device;

FIG. 2 is a schematic view of an optimal collection distance;

FIG. 3 is a cross-sectional view of an OVD apparatus;

FIG. 4 is a schematic view of an OVD plant production process;

FIG. 5 is a schematic view of D, D1 and D2 in a theoretical production process;

FIG. 6 is a schematic diagram of D2, D3 and D4 in an actual production process;

reference numerals: 1-air draft interface, 2-equipment body, 3-blowtorch platform, 4-correlation type laser sensor, 5-optical fiber perform SOOT, 6-core rod.

Detailed Description

The system and method for controlling the effective deposition of the overcladding layer of the optical fiber preform according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 4, an effective deposition control system for an outer cladding layer of an optical fiber preform comprises a correlation laser sensor 4 for generating a laser light curtain and detecting the position of the outer cladding layer of the optical fiber preform SOOT5, laser installation supports are arranged on two sides of a blowtorch platform 3, and the correlation laser sensor 4 is fixed on the laser installation supports. The correlation laser sensor 4 is interlocked with a servo motor of an upper and lower driving mechanism of the blowtorch platform 3, and the distance between the blowtorch and the outer cladding layer of the optical fiber perform SOOT5 is kept at the optimal collection distance through PID control.

As shown in fig. 5 and 6, a method for controlling efficient deposition of an outer cladding layer of an optical fiber preform includes:

in consideration of the conditions of heat dissipation, installation and the like, the design is as follows theoretically: the optimal collection distance D is the unobstructed distance D1+ the distance D2 from the torch to the lowest end of the light curtain of the correlation laser sensor 4. Hereinafter referred to as D, D1 and D2.

In the initial stage of actual production, five cases are possible depending on the position of the mandrel 6 (deposition not started) in the equipment design: 1. completely blocking the light curtain; 2. covering a point of laser on the edge of the lower end of the light curtain; 3. the lower end of the light curtain; 4. the edge of the upper end of the light curtain shields a point of laser; 5. the upper end of the light curtain, which does not affect the actual deposition, only affects the installation of the core rod in preparation for production and the step of taking out the Soot finished product after the end, and is not discussed further herein.

In the initial production stage, no matter which position the mandrel 6 is at when the mandrel 6 is preheated, the mandrel enters the optimal collection distance position in the preheating stage, and the mandrel position can be calculated according to the feedback signal of the shielded light curtain, wherein 1, 2 and 4 cases directly move to the optimal position, namely D1, and 3 and 5 need to move up and down for a certain distance to the light curtain to determine the movement direction and then move to D1.

The production stage comprises: during production, the core rod 6 rotates, and under the action of air draft, silica particles generated by flame combustion of the torch are continuously adsorbed on the surface of the core rod 6, so that the diameter of the core rod is continuously increased. The actual measured unobstructed distance of the laser light curtain varies continuously, defined as D3, and at this time D3+ D2 is the actual collection distance, defined as D4. The collection efficiency is highest when D4 equals D. As the deposition process proceeds, the diameter of the preform overcladding gradually increases, and if the torch platform does not move downward, the D3 distance decreases, resulting in a D4 that is less than the optimal collection distance D, at which point the actual collection efficiency decreases. In order to avoid this, the distance D3 which is actually measured by the laser light curtain and is not blocked is fed back to the PID control system for data processing, and the downward movement of the torch platform 3 is controlled (mainly the downward movement, the upward movement is only a few cases, and the excessive movement of the torch platform 3 causes D3 > D1 to compensate), so that D3 is equal to D1 as much as possible, and D4 is equal to D as much as possible, thereby maintaining the optimal collection state of the device.

The distance D1 that the light curtain of the correlation laser sensor 4 is not blocked and the distance D3 that the light curtain is actually measured and is not blocked are calculated according to the percentage position fed back by the correlation laser sensor 4 and the width of the laser light curtain.

The utility model discloses a PID system calculates the position that is sheltered from actually to carry out PID operation with its and theoretical settlement position and reachd blowtorch platform 3 up-and-down motion servo motor speed, thereby the up-and-down motion of accurate control platform blowtorch 3 makes the blowtorch be in the optimum state corresponding to optical fiber perform SOOT5 surrounding layer distance.

It should be noted that the utility model discloses an effective deposit control system of optical fiber perform surrounding layer is applicable to the simultaneous deposition of many optical fiber perform surrounding layers, and as shown in this embodiment of the figure, optical fiber perform quantity is three.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The effective deposition control system for the outer cladding layer of the optical fiber preform is characterized by comprising a correlation type laser sensor (4) used for generating a laser light curtain and detecting the position of the outer cladding layer of an optical fiber preform SOOT (5), wherein laser installation supports are arranged on two sides of a blowtorch platform (3), and the correlation type laser sensor (4) is fixed on the laser installation supports; the correlation laser sensor (4) is interlocked with a servo motor of an upper driving mechanism and a lower driving mechanism of the blowtorch platform (3), and the distance between the blowtorch and the outer cladding layer of the optical fiber perform rod SOOT (5) is kept at the optimal collection distance through PID control.