An optical fiber preform annealing apparatus

Abstract

The utility model discloses an optical fiber preform annealing equipment, including annealing furnace, the inside installation of annealing furnace has the heat preservation layer, all be equipped with the cylinder in the through -hole, the inside all installations of cylinder have heating layer, the one end of annealing furnace away from the mouth installs the cover, and the one end of cylinder away from the mouth extends to the inside of cover, and installs the wiring pipe, and the end surface of wiring pipe all sets up on the inner wall surface of cover, and one end all of wiring pipe installs the current -collecting ring, and the outer wall surface of cover is opposite to wiring pipe all and is equipped with the wiring hole, and the cover installs the drive mechanism of driving cylinder synchronous rotation, and the opening of annealing furnace installs the furnace cover. The utility model discloses simple structure, can heat the optical fiber preform through heating layer, and can drive cylinder and the synchronous rotation of heating layer through drive mechanism, need not make the optical fiber preform rotate, greatly reduce the situation of deformation, to ensure the quality of annealing, through the rotation mode of cylinder to ensure its heating uniformity.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber preform production technology, specifically to an optical fiber preform annealing device. Background Technology

[0002] The production of optical fiber preforms includes processes such as deposition, sintering, annealing, and stretching. During sintering, gases such as chlorine and helium are introduced. After sintering, a certain amount of gas and a large amount of internal stress remain inside the optical fiber preform. The presence of a large amount of internal stress can cause the optical fiber preform to crack during subsequent processing and easily break during fiber drawing. The residual gas will accumulate during stretching, forming a large number of small bubbles, causing serious quality problems. Annealing can effectively solve these problems.

[0003] Currently, patent CN 219489839 U discloses an optical fiber preform annealing device, including: a support frame, on which a cylindrical annealing furnace is provided, and a heater is provided inside the annealing furnace; and a rotating mechanism, which is located on the support plate of the support frame and corresponds to the opening end of the annealing furnace.

[0004] However, in order to increase the uniformity of heating, the aforementioned patent rotates the optical fiber preform. The rotational force generated by the rotation can easily cause deformation of the heated optical fiber preform, thereby affecting the annealing quality. Furthermore, the internal heating equipment is fixed and cannot be quickly replaced. Once damaged, subsequent repairs are troublesome. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide an optical fiber preform annealing device, in which the cylinder rotates on its own without driving the optical fiber preform to rotate, and the cylinder can be quickly assembled and disassembled, so as to solve the problems mentioned in the background art.

[0006] This utility model is achieved through the following technical solution: an optical fiber preform annealing device, including an annealing furnace, an insulation layer installed inside the annealing furnace, a plurality of annularly distributed through holes on the bottom surface of the insulation layer, penetrating the insulation layer and the annealing furnace, a cylinder in each through hole, a heating layer installed inside each cylinder, a cover installed at the end of the annealing furnace away from the opening, the end of the cylinder away from the opening extending into the interior of the cover and fitted with a wiring conduit, the end face of the wiring conduit being set on the inner wall surface of the cover, a slip ring installed at one end of the wiring conduit, wiring holes being provided on the outer wall surface of the cover opposite the wiring conduit, a drive mechanism installed on the cover to drive the cylinder to rotate synchronously, and a furnace cover installed on the opening of the annealing furnace.

[0007] As a preferred technical solution, the inner wall surface of the furnace cover is provided with internal threads, and the outer wall surface of the annealing furnace opening is provided with external threads. The furnace cover is connected to the external threads on the annealing furnace through the engagement of the external threads. A sealing layer is installed on the inner wall surface of the furnace cover. The sealing layer is inserted into the opening of the insulation layer and is set to abut against the inner wall surface of the insulation layer. The sealing layer is provided with insertion holes at the positions opposite to the cylinder. The surface of the furnace cover is provided with round holes at the positions opposite to the insertion holes. The inner diameter of the round holes is larger than that of the insertion holes. A cover plate covering the round holes is installed on the surface of the furnace cover through a hinge.

[0008] As a preferred technical solution, the drive mechanism includes a motor, a first gear and multiple second gears. The second gears are all installed outside the wiring conduit. The motor shafts all pass through the outer wall of the cover and are fixedly connected to the first gear. The first gear is located in the middle of the multiple second gears and is meshed with the multiple second gears.

[0009] As a preferred technical solution, a support base is installed at the end of the annealing furnace away from the opening.

[0010] As a preferred technical solution, both the sealing layer and the insulation layer are made of quartz wool.

[0011] As a preferred technical solution, the heating layer is made of resistance wire.

[0012] As a preferred technical solution, the diameter of the wiring conduit is set to be larger than the inner diameter of the wiring hole.

[0013] The beneficial effects of this utility model are: the utility model has a simple structure, the optical fiber preform can enter the cylinder through the round hole and the insertion hole, and the optical fiber preform can be heated by the heating layer, and the synchronous rotation of the cylinder and the heating layer can be driven by the driving mechanism, without the need to rotate the optical fiber preform, which greatly reduces the possibility of deformation and ensures the quality of annealing. The rotation of the cylinder ensures the uniformity of heating, and after the furnace cover is opened, the cylinder connected to the heating layer can be taken out of the annealing furnace, which facilitates its replacement and maintenance. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model after the cover plate is removed; Figure 3This is a schematic diagram of the structure of this utility model after removing the support base; Figure 4 This is a schematic diagram of the drive mechanism of this utility model; Figure 5 This is a cross-sectional view of the present invention.

[0016] The components are as follows: 1. Annealing furnace; 2. Furnace cover; 3. Cover plate; 4. Cover body; 5. Motor; 6. Support base; 7. Round hole; 8. Sealing layer; 9. Insertion hole; 10. Wiring hole; 11. Cylinder; 12. Second gear; 13. Wiring pipe; 14. Slip ring; 15. First gear; 16. Heating layer; 17. Insulation layer. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0019] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the present invention discloses an optical fiber preform annealing device, comprising an annealing furnace 1. The annealing furnace 1 has an insulation layer 17 installed inside. The bottom surface of the insulation layer 17 has multiple through holes arranged in a ring structure and penetrating the insulation layer 17 and the annealing furnace 1. Each through hole has a cylinder 11 installed inside. Each cylinder 11 has a heating layer 16 installed inside. A cover 4 is installed at the end of the annealing furnace 1 away from the opening. The end of the cylinder 11 away from the opening extends into the interior of the cover 4 and is equipped with a wiring conduit 13. The end face of the wiring conduit 13 is set on the inner wall surface of the cover 4. A collector ring 14 is installed at one end of the wiring conduit 13. Wiring holes 10 are provided on the outer wall surface of the cover 4 opposite to the wiring conduit 13. The cover 4 is equipped with a drive mechanism that drives the cylinder 11 to rotate synchronously. A furnace cover 2 is installed on the opening of the annealing furnace 1. The wires on the heat-conducting layer are connected to the fixed end of the collector ring, while another wire is connected to the movable end of the collector ring. The wires can pass through the wiring hole to extend to the outside and connect to the temperature controller and power supply. The heating temperature of the heating layer can be controlled by the temperature controller.

[0021] In this embodiment, the inner wall surface of the furnace cover 2 is provided with internal threads, and the outer wall surface of the opening of the annealing furnace 1 is provided with external threads. The furnace cover 2 is connected to the external threads on the annealing furnace 1 through the external threads. A sealing layer 8 is installed on the inner wall surface of the furnace cover 2. The sealing layer 8 is inserted into the opening of the insulation layer 17 and is set to abut against the inner wall surface of the insulation layer 17. The sealing layer 8 is provided with insertion holes 9 at the positions opposite to the cylinder 11. The surface of the furnace cover 2 is provided with round holes 7 at the positions opposite to the insertion holes 9. The inner diameter of the round holes 7 is set to be larger than that of the insertion holes 9. A cover plate 3 covering the round holes 7 is installed on the surface of the furnace cover 2 through a hinge.

[0022] In this embodiment, the drive mechanism includes a motor 5, a first gear 15, and a plurality of second gears 12. The second gears 12 are all installed on the outside of the wiring conduit 13. The rotating shaft of the motor 5 passes through the outer wall of the cover 4 and is fixedly connected to the first gear 15. The first gear 15 is located in the middle of the plurality of second gears 12 and is meshed with the plurality of second gears 12.

[0023] In this embodiment, a support base 6 is installed at the end of the annealing furnace 1 away from the opening.

[0024] In this embodiment, both the sealing layer 8 and the insulation layer 17 are made of quartz wool, which can effectively provide heat insulation and reduce heat loss.

[0025] In this embodiment, the heating layer 16 consists of resistance wires, which can be silicon molybdenum rods or silicon carbide rods to meet the heating temperature requirements.

[0026] In this embodiment, the diameter of the wiring tube 13 is larger than the inner diameter of the wiring hole 10, so that the wiring tube cannot fall down from the wiring hole.

[0027] In use, open the cover, insert the suspended optical fiber preform through the round hole and the insertion hole into the cylinder, and start the motor and heating layer. The start of the motor drives the first gear, the rotation of the first gear drives the second gear, and the second gear can synchronously drive the wiring tube and the cylinder. The rotation of the cylinder drives the heating layer, so that the heating layer can rotate to perform uniform heating operation on the optical fiber preform without the need for the optical fiber preform to rotate itself, thus avoiding deformation. When not in use, the cover can be closed to cover the round hole, reducing heat loss. During maintenance, the furnace cover can be removed, allowing the cylinder to be directly lifted out of the annealing furnace opening, greatly facilitating its maintenance and replacement.

[0028] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. An annealing apparatus for optical fiber preforms, characterized in that: The annealing furnace (1) includes an annealing furnace (1) with an insulation layer (17) installed inside. The bottom surface of the insulation layer (17) has multiple ring-shaped holes that penetrate the insulation layer (17) and the annealing furnace (1). Each hole has a cylinder (11) installed inside. Each cylinder (11) has a heating layer (16) installed inside. The end of the annealing furnace (1) away from the opening is equipped with a cover (4). The end of the cylinder (11) away from the opening extends into the inside of the cover (4) and is equipped with a wiring pipe (13). The end face of the wiring pipe (13) is set on the inner wall of the cover (4). Each end of the wiring pipe (13) is equipped with a collector ring (14). The outer wall of the cover (4) is provided with wiring holes (10) opposite to the wiring pipe (13). The cover (4) is equipped with a drive mechanism that drives the cylinder (11) to rotate synchronously. The opening of the annealing furnace (1) is equipped with a furnace cover (2).

2. The optical fiber preform annealing equipment according to claim 1, characterized in that: The inner wall of the furnace cover (2) is provided with an internal thread, and the outer wall of the opening of the annealing furnace (1) is provided with an external thread. The furnace cover (2) is connected to the external thread on the annealing furnace (1) through the external thread. A sealing layer (8) is installed on the inner wall of the furnace cover (2). The sealing layer (8) is inserted into the opening of the insulation layer (17) and is set to abut against the inner wall of the insulation layer (17). The sealing layer (8) is provided with a socket (9) at the position opposite to the cylinder (11). The surface of the furnace cover (2) is provided with a round hole (7) at the position opposite to the socket (9). The inner diameter of the round hole (7) is larger than that of the socket (9). A cover plate (3) covering the round hole (7) is installed on the surface of the furnace cover (2) through a hinge.

3. The optical fiber preform annealing equipment according to claim 1, characterized in that: The drive mechanism includes a motor (5), a first gear (15) and multiple second gears (12). The second gears (12) are all installed outside the wiring conduit (13). The shaft of the motor (5) passes through the outer wall of the cover (4) and is fixedly connected to the first gear (15). The first gear (15) is located in the middle of the multiple second gears (12) and is meshed with the multiple second gears (12).

4. The optical fiber preform annealing equipment according to claim 1, characterized in that: The annealing furnace (1) has a support base (6) installed at the end away from the opening.

5. The optical fiber preform annealing equipment according to claim 2, characterized in that: Both the sealing layer (8) and the insulation layer (17) are made of quartz wool.

6. The optical fiber preform annealing equipment according to claim 2, characterized in that: The heating layers (16) are all resistance wires.

7. The optical fiber preform annealing equipment according to claim 2, characterized in that: The diameter of the wiring conduit (13) is larger than the inner diameter of the wiring hole (10).

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