A sintering protection device for depositing loose bodies by OVD method

Abstract

The invention discloses a sintering protection device for depositing loose bodies by an OVD method, comprising a sintering furnace core tube, a deposition target rod and a protection tray; the deposition target rod is deposited with loose bodies; the deposition target rod with the loose bodies deposited is installed in the sintering furnace core tube; the tail end of the deposition target rod is provided with a mounting hole, and a ceramic pin is transversely penetrated through the mounting hole; the protection tray is an open structure, which has a tray bottom and an open tray cover arranged on the edge of the tray bottom; the middle part of the tray bottom of the protection tray has a center hole, the protection tray is mounted on the deposition target rod by using the center hole, and the protection tray is supported on the ceramic pin; the diameter of the open tray cover of the protection tray is greater than the diameter of the loose bodies. The invention can avoid the phenomenon of damaging the furnace core tube, can effectively protect the furnace core tube, reduce safety hazards, improve production efficiency, and reduce production costs.

Description

Technical Field

[0001] The invention relates to the field of optical fiber preform manufacturing, and in particular to a sintering protection device for loose bodies deposited by an OVD method. Background Art

[0002] At present, there are three main methods for preparing loose bodies of optical fiber preforms: modified chemical vapor deposition (MCVD), external vapor deposition (OVD) and axial vapor deposition (VAD). Among them, the external vapor deposition (OVD) method uses a co-flow flame generated by a metal lamp to perform flame hydrolysis and sintering to deposit SiO2 on the preform; generally, if the density of the deposited loose body before sintering is large, the deposited loose body is not easy to crack or fall off during the sintering process; however, for the fluorine-doped deposited loose body, since its density should not be too large, it is easy to crack and fall off during the sintering process; currently, if the loose body cracks or falls off during the dehydration / vitrification stage, it is difficult to clean it, and the fallen loose body is easy to damage the furnace core tube, causing gas leakage; and if the furnace core tube is replaced, it will not only increase the workload and reduce the production efficiency, but also waste resources; therefore, it is necessary to develop a sintering protection device for the loose body deposited by the OVD method. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a sintering protection device for loose bodies deposited by OVD method, which can avoid the phenomenon of damaging the furnace core tube, effectively protect the furnace core tube, reduce safety hazards, improve production efficiency and reduce production costs.

[0004] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0005] A sintering protection device for depositing loose bodies by an OVD method comprises a sintering furnace core tube, a deposition target rod and a protection tray; the deposition target rod is deposited with loose bodies; the deposition target rod with the deposited loose bodies is installed in the sintering furnace core tube; a mounting hole is provided at the tail end of the deposition target rod, and a ceramic pin is transversely passed through the mounting hole; the protection tray is an open structure, which comprises a tray bottom and an open tray cover arranged on the edge of the tray bottom; the middle of the tray bottom of the protection tray is provided with a center hole, the protection tray is mounted on the deposition target rod using the center hole, and the protection tray is supported on the ceramic pin; the diameter of the open tray cover of the protection tray is larger than the diameter of the loose bodies.

[0006] As a further improvement of the above technical solution of the present invention, the deposition target rod is composed of an upper target rod and a lower target rod, and the upper target rod and the lower target rod are welded into one by plasma welding, wherein the lower target rod is a core rod to be scrapped.

[0007] As a further improvement of the above technical solution of the present invention, the deposition target rod is installed in the sintering furnace core tube through a suspension rod.

[0008] As a preferred technical solution of the present invention, the protective tray is an open integrated structure, the open tray cover and the tray bottom are an integrated structure, and the open tray cover is a curved surface structure; further, the tray bottom thickness of the protective tray is 13 to 17 mm, and the tray depth of the protective tray is 47 to 53 mm.

[0009] As another preferred technical solution of the present invention, the protection tray is an open split structure, the edge of the bottom of the protection tray is provided with an annular groove, and the open tray cover is arranged in the annular groove; further, the bottom thickness of the protection tray is 13-17 mm, the depth of the annular groove is 8-10 mm, the height of the open tray cover is 51-59 mm, and the thickness of the open tray cover is 3-5 mm.

[0010] Furthermore, the length of the ceramic pin is 95-102 mm and the diameter is 9-11 mm.

[0011] Furthermore, the distance between the mounting hole on the deposition target rod and the end of the deposition target rod is 30-40 mm.

[0012] Beneficial effects of the present invention:

[0013] The protective device can provide certain protection for the sintering furnace core tube during the sintering process of the loose body; specifically, when the loose body falls off or breaks, the protective tray on the tail of the deposition target rod can catch the loose body powder that falls off to prevent the loose body powder from damaging the sintering furnace core tube, thereby effectively protecting the sintering furnace core tube, reducing safety hazards, greatly reducing the number of times the furnace core tube is replaced, extending the service life of the sintering furnace core tube, improving production efficiency, and reducing production costs.

[0014] The components of the protection device are light in texture and easy to install. The protection tray and ceramic pins therein will not affect the normal sintering of the loose body and will not be deformed during the sintering process.

[0015] After sintering, if a large amount of loose bodies fall off, the protective tray can be removed by depositing the target rod, and then the loose bodies in the protective tray can be cleaned and recovered; in addition, the loose bodies in the protective tray can be directly sucked out by powder suction operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the protection tray in Example 1 of the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of the protection tray in Example 2 of the present invention. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0020] Example 1

[0021] like Figure 1 and Figure 2 As shown, a sintering protection device for depositing loose bodies by OVD method comprises a sintering furnace core tube 1, a deposition target rod 2 and a protection tray 3; a loose body 5 is deposited on the deposition target rod 2; the deposition target rod 2 deposited with the loose body 5 is installed in the sintering furnace core tube 1 through a hanging rod 6; a mounting hole is provided at the tail of the deposition target rod 2, and a ceramic pin 4 is horizontally penetrated through the mounting hole; the protection tray 3 is an open structure, which is circular as a whole, and has a tray bottom 31 and an open tray cover 32 arranged on the edge of the tray bottom 31; the middle part of the tray bottom 31 of the protection tray 3 has a center hole 311, and the protection tray 3 is mounted on the deposition target rod 2 by using its center hole, and the protection tray 3 is supported on the ceramic pin 4; the diameter of the open tray cover 32 of the protection tray 3 is larger than the diameter of the loose body 5.

[0022] The deposition target rod 2 is composed of an upper target rod and a lower target rod, and the upper target rod and the lower target rod are welded together by plasma welding; the lower target rod is a core rod to be scrapped with unqualified optical parameters; the mounting hole for mounting the ceramic pin is opened on the tail of the lower target rod. In actual production, the welded deposition target rod can be placed at 1000°C for annealing and heat preservation treatment; the deposition target rod welded by plasma welding is not easy to deform during the sintering process.

[0023] The protective tray 3 is made of quartz material; in this embodiment 1, Figure 2 As shown, more specifically, the protection tray 3 is an open integrated structure, the open tray cover 32 and the tray bottom 31 are an integrated structure, and the open tray cover 32 is a curved surface structure; the tray bottom thickness of the protection tray 3 is 15 mm, and the tray depth of the protection tray 3 is 50 mm.

[0024] The ceramic pin 4 has a length of 100 mm and a diameter of 10 mm and can be replaced after being reused 15 times. The installation position of the ceramic pin 4 (the position of the installation hole on the deposition target rod) is 35 mm away from the end of the deposition target rod 2.

[0025] After the protection tray 3 and the deposition target rod 2 are installed through the ceramic pin 4, weights are placed on the protection tray 3. After 24 hours, if there is no abnormality in the entire structure, empty burning can be arranged. If there is no abnormality in the empty burning process, the gas flow and temperature curve are also normal, and after the empty burning is completed, the entire device has not been deformed, then it can be put into use.

[0026] Example 2

[0027] The difference between this embodiment 2 and embodiment 1 is that: Figure 3 As shown, the protection tray 3 is an open split structure, the edge of the bottom 31 of the protection tray 3 is provided with an annular groove, and the open tray cover 32 is snapped into the annular groove; in this embodiment 2, the thickness of the bottom 31 of the protection tray 3 is 15mm, the depth of the annular groove is 9mm, the height of the open tray cover 32 is 55mm, and the wall thickness of the open tray cover 32 is 4mm.

[0028] The protection device of the present invention is used in the sintering process, and it can provide certain protection to the sintering furnace core tube 1 during the sintering process of the loose body; specifically, when the loose body falls off or breaks, the protection tray 3 on the tail of the deposition target rod 2 can catch the loose body powder that falls off to prevent the loose body powder from damaging the sintering furnace core tube 1, thereby effectively protecting the sintering furnace core tube 1, reducing safety hazards, greatly reducing the number of times the furnace core tube is replaced, extending the service life of the sintering furnace core tube, improving production efficiency, and reducing production costs.

[0029] The components of the protection device are light in texture and easy to install. The protection tray and ceramic pins therein will not affect the normal sintering of the loose body and will not be deformed during the sintering process.

[0030] After sintering, if a large amount of loose bodies fall off, the protective tray 3 can be removed by depositing the target rod 2, and the loose bodies in the protective tray 3 can be cleaned and recycled using a recycling bucket; in addition, the loose bodies in the protective tray 3 can also be directly sucked out by a powder suction operation.

[0031] After the sintering protection device was put into actual use, it greatly increased the number of times the sintering furnace core tube was used, reduced the number of times the sintering furnace core tube was replaced, and reduced the production cost of the optical fiber preform rod; in actual production, the number of times the sintering furnace core tube was replaced was reduced from 3 times a year to 0.5 times; for the labor cost and heating component replacement cost caused by the replacement of the sintering furnace core tube, a single unit can save more than 500,000 yuan per year.

[0032] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sintering protection device for depositing loose bodies by OVD method, characterized in that: It comprises a sintering furnace core tube, a deposition target rod and a protection tray; the deposition target rod is composed of an upper target rod and a lower target rod, and the upper target rod and the lower target rod are welded together by plasma welding, wherein the lower target rod is a core rod to be scrapped; loose bodies are deposited on the deposition target rod; the deposition target rod with the loose bodies deposited is installed in the sintering furnace core tube; a mounting hole is provided at the tail end of the deposition target rod, and a ceramic pin is transversely penetrated through the mounting hole; the protection tray is an open structure, which comprises a tray bottom and an open tray cover arranged on the edge of the tray bottom; the middle part of the tray bottom of the protection tray is provided with a central hole, the protection tray is mounted on the deposition target rod by using the central hole, and the protection tray is supported on the ceramic pin; the diameter of the open tray cover of the protection tray is larger than the diameter of the loose bodies.

2. The sintering protection device for depositing loose bodies by OVD method according to claim 1, characterized in that: The deposition target rod is installed in the sintering furnace core tube through a suspension rod.

3. The sintering protection device for depositing loose bodies by OVD method according to claim 1, characterized in that: The protective tray is an open integrated structure, the open tray cover and the tray bottom are an integrated structure, and the open tray cover is a curved surface structure.

4. The sintering protection device for depositing loose bodies by OVD method according to claim 3, characterized in that: The bottom thickness of the protection tray is 13-17 mm, and the depth of the protection tray is 47-53 mm.

5. The sintering protection device for depositing loose bodies by OVD method according to claim 1, characterized in that: The protection tray is an open split structure, an annular groove is arranged on the edge of the bottom of the protection tray, and the open tray cover is arranged in the annular groove.

6. The sintering protection device for depositing loose bodies by OVD method according to claim 5, characterized in that: The bottom thickness of the protection tray is 13-17 mm, the depth of the annular groove is 8-10 mm, the height of the open tray cover is 51-59 mm, and the thickness of the open tray cover is 3-5 mm.

7. The sintering protection device for depositing loose bodies by OVD method according to claim 1, characterized in that: The length of the ceramic pin is 95-102 mm, and the diameter is 9-11 mm.

8. The sintering protection device for depositing loose bodies by OVD method according to claim 1, characterized in that: The distance between the mounting hole on the deposition target rod and the end of the deposition target rod is 30 to 40 mm.

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