A device and method for controlling the discharge of an optical fiber preform rod

Abstract

The application provides a discharging control device and method for an optical fiber preform rod, and the device comprises: a tubular structure, a cover plate for clamping a discharging pipe is arranged at a first end of the tubular structure for communication with the discharging pipe, and a funnel-shaped structure is integrally arranged at a second end of the tubular structure; a plurality of heating elements are symmetrically arranged in the tubular structure along a central axis of the tubular structure; cooling devices are arranged between adjacent heating elements in the circumferential direction of the tubular structure; and a plurality of heating elements are symmetrically arranged in the funnel-shaped structure along the central axis of the tubular structure. The application reduces the product stripe problem, the poor roundness problem and the burst problem caused by the uneven temperature field of the optical fiber preform rod in the initial stage of discharging, and improves the yield of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of core rod discharging control, in particular to a core rod discharging control device and method for optical fiber preform core rod. BACKGROUND

[0002] The statements in this section merely provide background technology related to the present application and do not necessarily constitute the prior art.

[0003] Optical glass has high transparency, stable optical properties, high optical uniformity, and specific and precise optical constants, and can be used to manufacture lenses, prisms, mirrors, windows and the like of optical instruments or mechanical systems, so the quality requirements of optical glass are higher than those of ordinary glass.

[0004] The optical fiber preform core rod is a front-end product for preparing optical glass, and the quality requirements are very strict. The preparation process of the optical fiber preform core rod is complicated, and each step must be performed according to the operation standard. In the initial stage of discharging, a hydrogen-oxygen flame is generally used to melt the discharge pipe to make the glass liquid flow into the mold. At this time, there is a large temperature difference between different parts of the glass liquid, and the temperature is difficult to accurately control. The glass produced in this stage can only rely on accelerating the speed of the furnace to ensure that the preform core rod moves forward normally, and artificial cold air is used to assist cooling.

[0005] The inventor found that too fast furnace speed would cause obvious stripes in the produced preform core rod and the roundness of the rod would not meet the requirements, reducing the yield. Artificial cooling air would make the liquid reach a stable state for a long time and easily cause the discharge pipe to be blocked. Moreover, if the cooling air is not controlled properly, the preform core rod is prone to burst. SUMMARY

[0006] In order to solve the problems of the prior art, the present application provides a core rod discharging control device and method for optical fiber preform, which reduces the problems of product stripe, poor roundness and burst caused by uneven temperature field of the optical fiber preform core rod in the initial stage of discharging, and improves the yield of the product.

[0007] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0008] The present application provides a core rod discharging control device for optical fiber preform in the first aspect.

[0009] A core rod discharging control device for optical fiber preform, comprising: a tubular structure, a cover plate for clamping the discharge pipe is arranged at the first end of the tubular structure for communication with the discharge pipe, and the second end of the tubular structure is an integrally formed funnel structure.

[0010] The plurality of heating elements are symmetrically arranged along the central axis of the tubular structure; and the cooling device is arranged between adjacent heating elements in the circumferential direction of the tubular structure.

[0011] As an optional implementation form of the first aspect of the present application, the cover plate comprises a first cover plate and a second cover plate, and the notch of the first cover plate cooperates with the notch of the second cover plate to clamp the discharge pipe.

[0012] As an optional implementation form of the first aspect of the present application, the heating elements arranged in the funnel-shaped structure have the same orientation as the heating elements in the tubular structure.

[0013] As an optional implementation form of the first aspect of the present application, the tubular structure is a circular pipe or a square pipe.

[0014] As an optional implementation form of the first aspect of the present application, the heating element is a heating electrode or a heating wire.

[0015] The second aspect of the present application provides a discharge control device for an optical fiber preform rod.

[0016] A discharge control device for an optical fiber preform rod, comprising: a tubular structure, the first end of the tubular structure being provided with a cover plate for clamping a discharge pipe in communication with the discharge pipe, and the second end of the tubular structure being connected with a funnel-shaped structure.

[0017] The plurality of heating elements are symmetrically arranged along the central axis of the tubular structure; and the cooling device is arranged between adjacent heating elements in the circumferential direction of the tubular structure.

[0018] As an optional implementation form of the second aspect of the present application, the cover plate comprises a first cover plate and a second cover plate, and the notch of the first cover plate cooperates with the notch of the second cover plate to clamp the discharge pipe.

[0019] As an optional implementation form of the second aspect of the present application, the heating elements arranged in the funnel-shaped structure have the same orientation as the heating elements in the tubular structure.

[0020] As an optional implementation form of the second aspect of the present application, the tubular structure is a circular pipe or a square pipe.

[0021] As an optional implementation form of the second aspect of the present application, the heating element is a heating electrode or a heating wire.

[0022] The third aspect of the present application provides a discharge control method for an optical fiber preform rod.

[0023] A kind of discharge control method of optical fiber preform core material stick, utilize the discharge control device of optical fiber preform core material stick described in the first aspect or second aspect of the present application, including the following processes:

[0024] Before discharging, the heating element arranged in funnel-shaped structure starts working with the heating element in tubular structure;

[0025] Temperature rising curve is set, the period when ambient temperature rises to first temperature, temperature rising rate is first value, and holding time is set;

[0026] The period when first temperature rises to target temperature, temperature rising rate is set as second value, and first value is greater than second value;

[0027] When actual temperature is greater than target temperature set value, alarm information is generated, and cooling device is started to cool down;

[0028] In the set range of target temperature, glass liquid is uniformly and stably discharged.

[0029] Compared with prior art, the beneficial effects of the present application are:

[0030] 1、The present application innovatively proposes a kind of discharge control device and method of optical fiber preform core material stick, reduces the product stripe problem, roundness problem and burst problem caused by uneven temperature field of optical fiber preform core material stick in initial stage of discharging, improves the yield of product.

[0031] 2、The present application innovatively proposes a kind of discharge control device and method of optical fiber preform core material stick, in combination with the heating element arranged in funnel-shaped structure and the heating element in tubular structure, can accurately control glass liquid temperature when discharging, so that material liquid is stably discharged. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings accompanying the specification provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute improper limitation on the present application.

[0033] Figure 1 The cover plate structure schematic diagram provided for embodiment 1 of the present application;

[0034] Figure 2 The tubular structure schematic diagram provided for embodiment 1 of the present application;

[0035] Wherein, 1, cover plate;1-1, first cover plate;1-2, second cover plate;2, heating element;3, cooling device;4, heating element. DETAILED DESCRIPTION

[0036] The present application will be further described below in conjunction with the drawings and embodiments.

[0037] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0040] Example 1:

[0041] like Figure 1 and Figure 2 As shown, Embodiment 1 of the present invention provides a discharge control device for optical fiber preform core rod, comprising: a tubular structure, wherein the first end (i.e., the upper end) of the tubular structure for communicating with the discharge tube is provided with a cover plate 1 for clamping the discharge tube, and the second end (i.e., the lower end) of the tubular structure is an integrally formed funnel-shaped structure (designed to adapt to the discharge port at the lower end of the discharge tube).

[0042] Multiple heating elements 2 are arranged symmetrically along the central axis of the tubular structure. A cooling device 3 is arranged between adjacent heating elements 2 along the circumference of the tubular structure. Multiple heating elements 4 are arranged symmetrically along the central axis of the tubular structure inside the funnel-shaped structure.

[0043] In this embodiment, the cover plate 1 includes a first cover plate 1-1 and a second cover plate 1-2. The notch of the first cover plate 1-1 and the notch of the second cover plate 1-2 cooperate to clamp the discharge pipe. Specifically, after the first cover plate 1-1 and the second cover plate 1-2 are combined, a round hole of the same thickness as the discharge pipe is provided in the middle to clamp the discharge pipe.

[0044] Understandably, in some other implementations, cover plate 1 can also be composed of more sub-cover plates to clamp the discharge pipe, such as three, four or more. Those skilled in the art can choose according to the specific working conditions, which will not be elaborated here.

[0045] In this embodiment, the heating element 2 arranged inside the funnel-shaped structure is in the same orientation as the heating element 4 inside the tubular structure, thereby making the temperature field more uniform.

[0046] Specifically, in the embodiment, the side wall of the tubular structure is provided with heating elements 2 (which can be one or multiple) in the four directions of southeast, southwest, northeast and northwest, so that a thermal field is formed when the heating elements are powered on, and the heating is more uniform.

[0047] Meanwhile, the side wall between each heating element 2 is provided with a cooling device 3, and five holes are drilled in each interval, i.e. a total of 20 holes, which serve as the inlet channels of the cooling medium.

[0048] The discharge control device of the optical fiber preform rod described in the embodiment is of an open structure, and the diameter of the opening at the top end (i.e. the first end) is adapted to the thickness of the discharge pipe, and then the space slightly increases downward to leave a space for the placement of the heating element. The funnel-shaped design at the lower end (i.e. the second end) is open to allow the material to flow out normally.

[0049] In the embodiment, the tubular structure and the funnel-shaped structure are integrally formed; it can be understood that in other implementations, the tubular structure and the funnel-shaped structure are fixedly connected, and those skilled in the art can select according to the specific working conditions, which will not be described here.

[0050] In the embodiment, the heating element can be a heating electrode or a heating wire, and compressed air can be introduced into the cooling device. Specifically, those skilled in the art can select the heating element and the cooling device according to the specific working conditions, which will not be described here.

[0051] In the embodiment, the tubular structure is a circular pipe or a square pipe, and those skilled in the art can select according to the specific working conditions, which will not be described here.

[0052] In the embodiment, before starting the discharge, the heating elements (2, 4) are started to reach the discharge temperature. When the material can flow out normally, the cooling device 3 is opened to control the temperature in the field within the specified range according to the real-time temperature results, and the heating elements (2, 4) and the cooling device 3 are adjusted to keep the temperature stable.

[0053] The working principle of the device described in the application is as follows:

[0054] The discharge control device is installed on the discharge pipe, and the internal heating elements (2, 4) heat the discharge pipe during discharge. The presence of the heating elements (2, 4) enables accurate temperature control, and the temperature in the field is stable when the temperature slowly rises to the discharge temperature. The temperature of the glass liquid can be continuously maintained within a small range during discharge, and the temperature difference between different parts of the glass liquid is small, so the discharge is stable. At this time, the furnace speed does not need to be accelerated, so the roundness of the rod is maintained. At the same time, uniform temperature control also reduces the internal stripes of the rod, improving the yield of the product.

[0055] Embodiment 2:

[0056] The embodiment 2 of the present application provides a discharging control method of the fiber preform rod, which utilizes the discharging control device of the fiber preform rod in the embodiment 1 of the present application, and comprises the following processes:

[0057] Before discharging, the heating elements arranged in the funnel-shaped structure start to work together with the heating elements in the tubular structure.

[0058] A temperature rising curve is set, the environmental temperature is raised to a first temperature at a first value of the temperature rising rate, and a holding time is set.

[0059] The first temperature is raised to a target temperature at a second value of the temperature rising rate, and the first value is greater than the second value.

[0060] When the actual temperature is greater than the target temperature by a set value, an alarm information is generated, and the cooling device is started to reduce the temperature.

[0061] Within a set range of the target temperature, the glass liquid is uniformly and stably discharged.

[0062] More specifically, a plurality of temperature control programs can be set, and then the temperature control programs can be used in different discharging temperature situations. Here, three different discharging temperatures of 1250℃, 1290℃ and 1300℃ are taken as examples for illustration.

[0063] (1) Temperature control program A - discharging temperature is 1250℃

[0064] Before discharging, the temperature control program is adjusted to A, the heating elements (2, 4) start to work, a temperature rising curve is set, the environmental temperature is raised to 1150℃ at a temperature rising rate of 10℃ / min, and a holding time of 5min is set; the temperature rising rate is set to 5℃ / min in the temperature range of 1150-1250℃. When the temperature display exceeds 5℃, the system automatically alarms, and the cooling device 3 is automatically started to reduce the temperature until 1250±5℃, so that the glass liquid can be uniformly and stably discharged.

[0065] (2) Temperature control program B - discharging temperature is 1290℃

[0066] Before discharging, the temperature control program is adjusted to B, the heating elements (2, 4) start to work, a temperature rising curve is set, the environmental temperature is raised to 1190℃ at a temperature rising rate of 10℃ / min, and a holding time of 5min is set; the temperature rising rate is set to 5℃ / min in the temperature range of 1190-1290℃. When the temperature display exceeds 5℃, the system automatically alarms, and the cooling device 3 is automatically started to reduce the temperature until 1290±5℃, so that the glass liquid can be uniformly and stably discharged.

[0067] (3) Temperature control program C - discharging temperature is 1300℃

[0068] Before discharging, the temperature control program is adjusted to C, the heating elements (2, 4) start to work, the temperature rising curve is set, when the ambient temperature rises to 1200℃, the temperature rising rate is set to 10℃ / min, and the temperature is kept for 5 min; when the temperature is in the range of 1200-1300℃, the temperature rising rate is set to 5℃ / min. When the temperature display exceeds 5℃, the system automatically alarms, the cooling device 3 is automatically started, the temperature drops until 1300±5℃, and the glass liquid can be uniformly and stably discharged.

[0069] The core material rods formed by discharging with the device and without the device are compared, the same process conditions and the same ingredient list are used, the inner stripe and the roundness of the core material rods produced by the application are obviously improved, and the specific data of the ovality and the stripe of the first 20 core material rods are compared and shown in the following table.

[0070]

[0071] From the data in the above table, it can be seen that the device can obviously reduce the ovality of the core material rod, reduce the inner stripe of the core material rod, and improve the quality and the yield of the product.

[0072] The above only describes the preferred embodiments of the application and is not used to limit the application, and the application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An apparatus for controlling the delivery of an optical fiber preform rod, Characterized in that, It comprises a tubular structure, the first end of which is provided with a cover plate for clamping the discharge pipe for communication with the discharge pipe, and the second end of which is integrally formed with a funnel-shaped structure; A plurality of heating elements are arranged in the tubular structure symmetrically along the central axis of the tubular structure; along the circumferential direction of the tubular structure, cooling devices are arranged between adjacent heating elements, and a plurality of heating elements are arranged in the funnel-shaped structure symmetrically along the central axis of the tubular structure; The heating elements are heating electrodes or heating wires; Compressed air is introduced into the cooling devices; The cover plate comprises a first cover plate and a second cover plate, the gap of the first cover plate cooperates with the gap of the second cover plate to clamp the discharge pipe; after the first cover plate and the second cover plate are combined, a circular hole with the diameter of the discharge pipe is arranged in the middle to clamp the discharge pipe; the cover plate is composed of several sub-cover plates to clamp the discharge pipe; The heating elements arranged in the funnel-shaped structure have the same orientation as the heating elements in the tubular structure; Before discharging, the heating elements arranged in the funnel-shaped structure start working together with the heating elements in the tubular structure; A temperature rising curve is set, the period when the ambient temperature rises to the first temperature, the temperature rising rate is the first value, and the holding time is set; The period when the first temperature rises to the target temperature, the temperature rising rate is set as the second value, and the first value is greater than the second value; When the actual temperature is greater than the target temperature by a set value, an alarm information is generated, and the cooling device is started to cool down; Within the set range of the target temperature, the glass liquid is uniformly and stably discharged.

2. The discharge control device of the optical fiber preform rod according to claim 1, characterized in that, The tubular structure is a circular pipe or a square pipe.

3. An apparatus for controlling the delivery of an optical fiber preform rod, Characterized in that, It comprises a tubular structure, the first end of which is provided with a cover plate for clamping the discharge pipe for communication with the discharge pipe, and the second end of which is integrally formed with a funnel-shaped structure; A plurality of heating elements are arranged in the tubular structure symmetrically along the central axis of the tubular structure; along the circumferential direction of the tubular structure, cooling devices are arranged between adjacent heating elements, and a plurality of heating elements are arranged in the funnel-shaped structure symmetrically along the central axis of the tubular structure; The heating elements are heating electrodes or heating wires; Compressed air is introduced into the cooling devices; The cover plate comprises a first cover plate and a second cover plate, the gap of the first cover plate cooperates with the gap of the second cover plate to clamp the discharge pipe; after the first cover plate and the second cover plate are combined, a circular hole with the diameter of the discharge pipe is arranged in the middle to clamp the discharge pipe; the cover plate is composed of several sub-cover plates to clamp the discharge pipe; The heating elements arranged in the funnel-shaped structure have the same orientation as the heating elements in the tubular structure; Before discharging, the heating elements arranged in the funnel-shaped structure start working together with the heating elements in the tubular structure; A temperature rising curve is set, the period when the ambient temperature rises to the first temperature, the temperature rising rate is the first value, and the holding time is set; The period when the first temperature rises to the target temperature, the temperature rising rate is set as the second value, and the first value is greater than the second value; When the actual temperature is greater than the target temperature by a set value, an alarm information is generated, and the cooling device is started to cool down; Within the set range of the target temperature, the glass liquid is uniformly and stably discharged.

4. The device for controlling the discharge of a fiber preform rod according to claim 3, characterized in that, the tubular structure is a round tube or a square tube.

5. A method of controlling the delivery of an optical fiber preform rod, characterized by, The device for controlling the discharge of a fiber preform rod according to any one of claims 1-4, comprising the following process: Before the discharge, the heating element arranged in the funnel-shaped structure starts to work together with the heating element in the tubular structure; A temperature rising curve is set, the time period for the ambient temperature to rise to the first temperature, the temperature rising rate is a first value, and the holding time is set; The time period for the first temperature to rise to the target temperature, the temperature rising rate is set as a second value, and the first value is greater than the second value; When the actual temperature is greater than the target temperature by a set value, an alarm information is generated, and the cooling device is started to cool down; Within the set range above and below the target temperature, the glass liquid is uniformly and stably discharged.

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