Optical fiber preform rod sintering furnace and heat preservation layer fixing assembly thereof

Abstract

The utility model relates to the field of optical fiber preform production, in particular to an optical fiber preform sintering furnace and a heat preservation layer fixing assembly thereof. The heat preservation layer fixing assembly of the optical fiber preform rod sintering furnace is used for fixing a first heat preservation layer on the top of a heating cavity and comprises a fixing plate and a lifting piece. The fixing plate is arranged above the first heat preservation layer, and a plurality of penetrating holes are formed in the fixing plate. The lifting piece comprises a plurality of supporting brackets and a plurality of connecting columns connected to the side faces, in the same direction, of the supporting brackets. The multiple connecting columns sequentially penetrate through the first heat preservation layer and the penetrating holes and are detachably connected to the fixing plate. The supporting bracket is used for supporting the first heat preservation layer. Due to the fact that the lifting piece cannot hinder light rays carrying heat, the optical fiber preform rod sintering furnace has high heat efficiency. And the connecting column of the lifting piece is protected in the first heat preservation layer and extends out of the heating cavity, deformation caused by the high temperature in the heating cavity is not likely to happen, cracking and falling off of the first heat preservation layer are restrained, and the service life of the optical fiber preform rod sintering furnace can be prolonged.

Description

Technical Field

[0001] The utility model relates to the field of optical fiber preform production, in particular to an optical fiber preform sintering furnace and a heat-insulating layer fixing component thereof. Background Art

[0002] During the production of optical fiber preforms, the core rods need to be sintered at high temperatures, and an optical fiber preform sintering furnace is required for sintering. Usually, an insulation layer needs to be set in the heating chamber of the optical fiber preform sintering furnace to prevent heat from escaping. The insulation layer is usually constructed to include three parts: top, bottom and side, and through holes are set in the middle of the top insulation layer and the bottom insulation layer for the furnace core tube to pass through. Since the top insulation layer has poor integrity after heating, it cannot be fully supported by the side insulation layer alone and is prone to collapse. Therefore, other supporting structures are required to assist in supporting the top insulation layer.

[0003] The current insulation layer fixing assembly consists of two ring plates and multiple columns. The two ring plates are coaxially sleeved outside the furnace core tube, and multiple columns are fixedly connected between the two ring plates. The lower ring plate is supported by the bottom insulation layer, the upper ring plate is supported by the lower ring plate via the columns, and the top insulation layer is supported by the upper ring plate, thus preventing the top insulation layer from collapsing.

[0004] However, in the above structure, there are multiple columns between the furnace core tube and the heating tube arranged on the inner wall of the side insulation layer. The existence of the columns will block the propagation of light carrying heat, resulting in a decrease in the thermal efficiency of the optical fiber preform sintering furnace. Utility Model Content

[0005] The purpose of the utility model is to provide an optical fiber preform sintering furnace with high thermal efficiency and a heat insulation layer fixing component thereof.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0007] An insulation layer fixing assembly for an optical fiber preform sintering furnace, used for fixing a first insulation layer on the top of a heating chamber, comprising:

[0008] A fixing plate is arranged above the first thermal insulation layer, and the fixing plate is provided with a plurality of through holes;

[0009] The lifting member includes several support brackets and multiple connecting columns connected to the side surfaces of the support brackets in the same direction. The top surface of the support brackets is used to support the first thermal insulation layer. The multiple connecting columns are respectively matched with the multiple through holes. The connecting columns all pass through the first thermal insulation layer and the through holes in turn, and are detachably connected to the fixed plate.

[0010] Optionally, the fixing plate includes an annular portion and a plurality of elongated protrusions, one end of each protrusion is connected to a side of the annular portion close to its center, and the protrusion extends in a direction toward the center of the annular portion, and the through hole is formed in the protrusion.

[0011] Optionally, one end of the connecting column of the pulling member away from the supporting bracket is fastened to the fixing plate through an inner wire tube clamp.

[0012] Optionally, the lifting member includes a plurality of the support brackets, the plurality of the support brackets are arranged separately from each other, and at least one of the connecting columns is connected to any of the support brackets.

[0013] In a second aspect, the present invention further provides an optical fiber preform sintering furnace, comprising the above-mentioned thermal insulation layer fixing assembly of the optical fiber preform sintering furnace, and the optical fiber preform sintering furnace further comprising:

[0014] The heating chamber includes the first insulation layer, the second insulation layer, the barrel-shaped insulation layer and the heating rods, the first insulation layer has a through hole formed in the middle, the second insulation layer is arranged opposite to the first insulation layer and has a through hole formed in the middle, the two ends of the barrel-shaped insulation layer are respectively connected to the first insulation layer and the second insulation layer, and the heating rods are circumferentially arranged in the barrel-shaped insulation layer;

[0015] A tower frame, comprising a longitudinal frame, a first transverse plate and a second transverse plate, wherein the first transverse plate and the second transverse plate are both supported by the longitudinal frame and arranged opposite to each other, the first transverse plate being higher than the second transverse plate and being used to connect the fixing plate and the first insulation layer, and the second transverse plate being used to support the second insulation layer;

[0016] The furnace core tube is constructed in a straight tube shape and passes through the through holes on the first insulation layer and the through holes on the second insulation layer.

[0017] Optionally, the first transverse plate is arranged between the fixed plate and the first thermal insulation layer, the fixed plate is partially supported by the first transverse plate, and the fixed plate and the first thermal insulation layer are separated from each other.

[0018] Optionally, the first thermal insulation layer includes multiple layers of stacked thermal insulation boards.

[0019] Optionally, the insulation board is formed by splicing a plurality of insulation blocks arranged in sequence along the circumferential direction.

[0020] Optionally, the joints between adjacent insulation blocks are constructed in a stepped shape.

[0021] According to the first aspect of the present invention, the fixing plate is fixedly arranged above the first thermal insulation layer, and the first thermal insulation layer is supported by the support bracket of the lifting member, and the connecting column of the lifting member is detachably connected to the fixing plate, thereby achieving the fixation of the first thermal insulation layer, and will not cause obstruction to the light carrying heat, and has high thermal efficiency. The lifting member has a simple structure and is easy to produce and uses less material, which helps to reduce production costs. The connecting column of the lifting member is protected in the first thermal insulation layer and extends to the outside of the heating chamber. It is not easy to deform due to the high temperature in the heating chamber, which inhibits the cracking and falling off of the first thermal insulation layer, and helps to increase the life of the first thermal insulation layer.

[0022] Furthermore, the hollowing out of the fixed plate portion helps reduce the cost of raw materials and the total weight. The first insulation layer is connected to the extension extending from the edge of the fixed plate toward the middle, so that the supporting force of the lifting member is applied to the position of the first insulation layer away from the edge. On the one hand, the lifting member is away from the heat source and the ambient temperature of the lifting member is reduced. On the other hand, the edge of the first insulation layer is supported by the insulation layer on the side, which helps to make the supporting force at each position of the first insulation layer more uniform, improve the supporting effect, and suppress the deformation and collapse of the first insulation layer and the shedding of materials, thereby extending the service life of the first insulation layer.

[0023] Furthermore, constructing the lifting member into multiple separately arranged structures helps to save raw materials and simplify the manufacturing process, thereby reducing the production cost of the lifting member, and helps prevent the deformation of a small number of connecting columns from causing the overall deformation of the support bracket, thereby improving the fault tolerance rate and extending the service life.

[0024] According to the second aspect of the present invention, the first thermal insulation layer, the second thermal insulation layer, the barrel-shaped thermal insulation layer and the furnace core tube together form a heating chamber with good thermal insulation effect, thereby improving thermal efficiency, reducing energy waste and loss of the heating tube, and extending the service life of the first thermal insulation layer through the thermal insulation layer fixing assembly of the optical fiber preform rod sintering furnace, thereby making the optical fiber preform rod sintering furnace have a longer service life.

[0025] Furthermore, the first transverse plate is positioned between the fixed plate and the first insulation layer, providing stronger support for the fixed plate. A gap exists between the connection between the fixed plate and the lifting member, and between the first insulation layer and the lifting member, allowing space for the first insulation layer to change in volume due to temperature fluctuations. This helps reduce the risk of damage to the first insulation layer and prolong its service life.

[0026] Furthermore, by splitting the first insulation layer into multiple layers of stacked insulation boards and using the gaps between the insulation boards as shrinkage joints, the first insulation layer is prevented from being excessively squeezed due to volume differences caused by thermal expansion and contraction, helping to protect its structure. Thinner insulation boards are less expensive, helping to reduce production costs.

[0027] Furthermore, the joints between adjacent insulation blocks are used as shrinkage joints to reduce the risk of damage to the first insulation layer. The shape requirements of the insulation blocks are relatively low, which helps to improve the utilization rate of the entire board and reduce raw material costs.

[0028] Furthermore, the stepped joints help to improve the thermal insulation effect and help to increase the mutual support between the insulation blocks, thereby improving the integrity and stability of the structure and helping to increase the service life of the first insulation layer.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural schematic diagram of the thermal insulation layer fixing assembly, the first transverse plate, the thermal insulation cavity, the second transverse plate, and part of the furnace core tube of the optical fiber preform sintering furnace shown in the first embodiment of the present utility model;

[0031] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0032] Figure 3 This is a schematic structural diagram of an optical fiber preform sintering furnace shown in the first embodiment of the present invention;

[0033] Figure 4 This is a structural diagram of the fixing plate shown in the first embodiment of the present utility model;

[0034] Figure 5 This is a schematic structural diagram of the lifting member shown in Example 1 of the present utility model.

[0035] Legend: 1-tower, 11-longitudinal frame, 12-first transverse plate, 13-second transverse plate, 2-heating chamber, 21-first insulation layer, 211-insulation plate, 22-second insulation layer, 23-barrel-shaped insulation layer, 24-heating rod, 31-fixing plate, 311-annular portion, 312-extending portion, 313-through hole, 32-lifting piece, 321-support bracket, 322-connecting column, 33-inner wire pipe clamp, 4-furnace core tube, 5-auxiliary insulation layer. DETAILED DESCRIPTION

[0036] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] See Figure 1 、 Figure 2 、 Figure 4 and Figure 5 The insulation layer fixing assembly of the optical fiber preform sintering furnace protected by the utility model application is used to fix the first insulation layer 21 on the top of the heating chamber 2, and includes a fixing plate 31 and a pulling member 32. The fixing plate 31 is arranged above the first insulation layer 21, and is provided with a plurality of through holes 313. The pulling member 32 includes a plurality of support brackets 321 and a plurality of connecting columns 322 connected to the side surfaces of the support brackets 321 in the same direction. The plurality of connecting columns 322 all pass through the first insulation layer 21 and the through holes 313 in sequence, and are detachably connected to the fixing plate 31. The support bracket 321 is used to support the first insulation layer 21.

[0041] The fixing plate 31 is fixedly arranged above the first insulation layer 21, and the first insulation layer 21 is supported by the support bracket 321 of the lifting member 32. The connecting column 322 of the lifting member 32 is detachably connected to the fixing plate 31, thereby achieving the fixation of the first insulation layer 21 without obstructing the light carrying heat, and having high thermal efficiency. The lifting member 32 has a simple structure and is easy to produce and uses less material, which helps to reduce production costs. The connecting column 322 of the lifting member 32 is protected in the first insulation layer 21 and extends to the outside of the heating chamber 2. It is not easy to deform due to the high temperature in the heating chamber 2, which suppresses the cracking and falling off of the first insulation layer 21, and helps to increase the life of the first insulation layer 21.

[0042] Please refer to the following examples for details.

[0043] Example 1:

[0044] See Figure 1 and Figure 3 The optical fiber preform sintering furnace shown in a preferred embodiment of the present application includes a tower 1, a heating chamber 2, an insulation layer fixing assembly, and a furnace core tube 4. The tower 1 is vertically arranged, and the heating chamber 2 is fixedly supported by the tower 1. The insulation layer fixing assembly is fixedly connected between the first insulation layer 21 at the top of the heating chamber 2 and the tower 1, supporting the first insulation layer 21 of the heating chamber 2. The heating chamber 2 has only two opposing circular openings at the top and bottom. The cylindrical furnace core tube 4 is vertically arranged and passes through the heating chamber 2 through the two openings.

[0045] The tower 1 includes a vertical longitudinal frame 11 and a first transverse plate 12 and a second transverse plate 13 horizontally supported on the longitudinal frame 11. The first transverse plate 12 and the second transverse plate 13 are arranged opposite each other, with the first transverse plate 12 being taller than the second transverse plate 13. A circular through-hole with a diameter larger than the outer wall of the furnace tube 4 is formed in the first transverse plate 12.

[0046] The heating chamber 2 is constructed as a hollow cylinder as a whole, including a first insulation layer 21, a second insulation layer 22, a barrel-shaped insulation layer 23 and a heating rod 24. The first insulation layer 21 and the second insulation layer 22 are both constructed in an annular shape, with a through hole formed in the middle for the furnace core tube 4 to pass through. The barrel-shaped insulation layer 23 is constructed in a cylindrical shape, vertically arranged and connected between the first insulation layer 21 and the second insulation layer 22, and the outer wall of the barrel-shaped insulation layer 23 is flush with the edges of the first insulation layer 21 and the second insulation layer 22. The heating rod 24 is arranged in a circular pattern and is vertically arranged close to the inner wall of the barrel-shaped insulation layer 23. One end of the heating rod 24 is adjacent to the inner wall of the second insulation layer 22, and the other end extends through the first insulation layer 21 to the outside of the heating chamber 2 and connects to the circuit group.

[0047] In this embodiment, the bottom of the second insulation layer 22 is directly supported on the second transverse plate 13, and the first insulation layer 21 is located below the first transverse plate 12. The insulation layer fixing assembly fixes the inner wall of the first insulation layer 21 to the first transverse plate 12.

[0048] See Figure 1 、 Figure 4 and Figure 5 The thermal insulation layer fixing assembly includes a fixing plate 31 and a pulling member 32 .

[0049] The fixed plate 31 is constructed as a partially hollowed-out disc and includes an annular portion 311 and a protruding portion 312. The annular portion 311 is constructed in the shape of a circular ring, and the diameter of its inner circle is equal to the diameter of the through hole on the first transverse plate 12. The protruding portion 312 is constructed in the shape of an elongated strip, one end of which is fixedly connected to the annular portion 311, and the other end extends toward the center of the annular portion 311. The fixed plate 31 is supported as a whole above the first transverse plate 12 and is coaxially fixedly connected to the first transverse plate 12. The furnace core tube 4 passes through the fixed plate 31 longitudinally, and the end of the protruding portion 312 of the fixed plate 31 away from the annular portion 311 is close to the outer wall of the furnace core tube 4. In this example, eight protruding portions 312 are evenly arranged, and a through hole 313 vertically penetrating the protruding portion 312 is formed at the same position on each protruding portion 312 of the fixed plate 31, and the through hole 313 is arranged away from the annular portion 311.

[0050] The lifting member 32 includes a support bracket 321 and a connecting column 322. The connecting column 322 is constructed as a long cylindrical shape. One end of the connecting column is coaxially connected to the support bracket 321 configured as a circular support plate, and the other end has a thread. In this embodiment, eight lifting members 32 are included. Each lifting member 32 passes through the channel vertically penetrating the first thermal insulation layer 21 with the support bracket 321 in the downward direction, and passes through the through hole 313 of the fixed plate 31. The inner wire tube clamp 33 provided above the fixed plate 31 is fastened to the lifting member 32 by a thread, so that each lifting member 32 is fixed to the support plate. At this time, the support bracket 321 of each lifting member 32 is supported on the first thermal insulation layer 21. Because the support position of the lifting member 32 is close to the furnace core tube 4 and away from the barrel-shaped insulation layer 23, it helps to improve the support force of the first insulation layer 21 on the side close to the furnace core tube 4. The side of the first insulation layer 21 close to the furnace core tube 4 is primarily supported by the insulation layer fixing assembly, while the side close to the barrel-shaped insulation layer 23 is primarily supported by the barrel-shaped insulation layer 23. This prevents the first insulation layer 21 from being partially collapsed due to uneven support force. Because the fixing plate 31 is disposed outside the heating chamber 2, and the connecting column 322 of the lifting member 32 partially extends outside the heating chamber 2 and is partially embedded in the first insulation layer 21, the insulation layer fixing assembly as a whole is less affected by the high temperature within the heating chamber 2, thereby achieving a longer service life. The insulation layer fixing assembly does not form a barrier between the furnace core tube 4 and the heating tube, and has high heat transfer efficiency. This helps to improve the thermal efficiency of the optical fiber preform sintering furnace, reduces the heating and insulation burdens of the heating chamber 2, and helps to extend the overall service life.

[0051] In this embodiment, the fixed plate 31 is positioned above the first transverse plate 12, the first insulation layer 21 is positioned below the first transverse plate 12, and the first transverse plate 12 itself has thickness, resulting in a gap between the first insulation layer 21 and the fixed plate 31. This provides a large buffer space when the first insulation layer 21 expands due to heat, thereby preventing collapse of the first insulation layer 21. Furthermore, in this embodiment, the first insulation layer 21 is composed of multiple insulation blocks. Multiple insulation blocks of equal thickness are assembled into a circular insulation board 211, and multiple insulation boards 211 are stacked to form the first insulation layer 21. By splicing a plurality of insulation blocks to form the first insulation layer 21, the first insulation layer 21, which is clamped between the fixed plate 31 and the support bracket 321 of the lifting member 32 by the connecting column 322 and the inner wire tube clamp 33 of the lifting member 32, can have more shrinkage seams inside, providing a buffer space for the first insulation layer 21 to change in volume due to thermal expansion and contraction, helping to prevent the first insulation layer 21 from collapsing and extending the service life of the first insulation layer 21. In addition, the mutual influence between the insulation boards 211 that are not fixedly connected to each other is small, and it is not easy for large-scale overall damage to occur due to damage in one place, which also helps to extend the service life of the first insulation layer 21. In addition, the insulation blocks can be divided from a whole piece of plate, and splitting the insulation board 211 into smaller insulation blocks helps to improve material utilization.

[0052] In this embodiment, the joints between adjacent insulation blocks on the same insulation board 211 are stepped, that is, there are mutually cooperating raised structures on the side of the insulation board 211, so that adjacent insulation blocks support each other, which helps to improve the integrity of the insulation board 211, thereby inhibiting the collapse of the first insulation layer 21 and extending the service life of the first insulation layer 21.

[0053] See Figure 3 The structure of the furnace core tube 4 in this embodiment is based on the prior art and will not be described in detail here. The inlet of the furnace core tube 4 faces upward, and the middle portion passes through the heating chamber 2.

[0054] The optical fiber preform sintering furnace in this embodiment also includes an auxiliary thermal insulation layer 5. This layer is fixedly connected to the tower 1 and surrounds the portion of the furnace core tube 4 located above the heating chamber 2. It is used to suppress the escape of heat within the heating chamber 2, thereby improving the thermal efficiency of the optical fiber preform sintering furnace and preventing safety hazards caused by excessively high temperatures around the optical fiber preform sintering furnace.

[0055] The beneficial effects of the present invention are as follows: the first insulation layer 21 at the top of the heating chamber 2 of the optical fiber preform sintering furnace is supported by the support bracket 321 of the lifting member 32, and is fixed by the connecting column 322 of the lifting member 32, which is detachably connected to the fixing plate 31 above the heating chamber 2. This does not block the heat transfer between the heating rod 24 disposed within the heating chamber 2 and the furnace core tube 4, thereby enabling the optical fiber preform sintering furnace to have a higher heat transfer efficiency. The connecting column 322 of the lifting member 32 is partially embedded within the interior of the first insulation layer 21 and is not easily damaged by heating, thereby helping to increase the service life of the optical fiber preform sintering furnace. The lifting member 32 and the first insulation layer 21 have a simple structure, are easy to construct, are low in cost, and have high practicality.

[0056] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A heat-insulating layer fixing assembly for an optical fiber preform sintering furnace, used for fixing a first heat-insulating layer (21) on the top of a heating chamber (2), characterized in that: include: A fixing plate (31) is arranged above the first heat-insulating layer (21), and the fixing plate (31) is provided with a plurality of through holes (313); The lifting member (32) includes a plurality of support brackets (321) and a plurality of connecting columns (322) connected to the side surfaces of the plurality of support brackets (321) in the same direction. The top surface of the support brackets (321) is used to support the first thermal insulation layer (21). The plurality of connecting columns (322) are respectively matched with the plurality of through holes (313). The connecting columns (322) all pass through the first thermal insulation layer (21) and the through holes (313) in sequence and are detachably connected to the fixing plate (31).

2. The thermal insulation layer fixing assembly of the optical fiber preform sintering furnace according to claim 1, characterized in that: The fixing plate (31) includes an annular portion (311) and a plurality of long strip-shaped protruding portions (312), one end of each protruding portion (312) is connected to a side of the annular portion (311) close to the center thereof, and the protruding portion (312) extends in a direction toward the center of the annular portion (311), and the through hole (313) is formed in the protruding portion (312).

3. The thermal insulation layer fixing assembly of the optical fiber preform sintering furnace according to claim 1, characterized in that: One end of the connecting column (322) of the pulling member (32) away from the supporting bracket (321) is fastened to the fixing plate (31) through an inner wire tube clamp (33).

4. The thermal insulation layer fixing assembly of the optical fiber preform sintering furnace according to claim 1, characterized in that: The lifting member (32) includes a plurality of support brackets (321), and the plurality of support brackets (321) are arranged separately from each other. At least one connecting column (322) is connected to any one of the support brackets (321).

5. An optical fiber preform sintering furnace, characterized in that: The optical fiber preform sintering furnace comprises the thermal insulation layer fixing assembly of any one of claims 1 to 4, wherein the optical fiber preform sintering furnace further comprises: The heating chamber (2) comprises the first thermal insulation layer (21), the second thermal insulation layer (22), the barrel-shaped thermal insulation layer (23) and the heating rod (24); the first thermal insulation layer (21) is provided with a through hole in the middle; the second thermal insulation layer (22) is arranged opposite to the first thermal insulation layer (21) and has a through hole in the middle; the two ends of the barrel-shaped thermal insulation layer (23) are respectively connected to the first thermal insulation layer (21) and the second thermal insulation layer (22); and the heating rod (24) is circumferentially arranged in the barrel-shaped thermal insulation layer (23); A tower (1) comprises a longitudinal frame (11), a first transverse plate (12) and a second transverse plate (13), wherein the first transverse plate (12) and the second transverse plate (13) are both supported on the longitudinal frame (11) and arranged opposite to each other, the first transverse plate (12) is higher than the second transverse plate (13) and is used to connect the fixing plate (31) and the first thermal insulation layer (21), and the second transverse plate (13) is used to support the second thermal insulation layer (22); The furnace core tube (4) is constructed in a straight tube shape and passes through the through hole on the first thermal insulation layer (21) and the through hole on the second thermal insulation layer (22).

6. The optical fiber preform sintering furnace according to claim 5, characterized in that: The first transverse plate (12) is arranged between the fixed plate (31) and the first thermal insulation layer (21), the fixed plate (31) is partially supported by the first transverse plate (12), and the fixed plate (31) and the first thermal insulation layer (21) are separated from each other.

7. The optical fiber preform sintering furnace according to claim 6, wherein: The first thermal insulation layer (21) comprises a plurality of stacked thermal insulation boards (211).

8. The optical fiber preform sintering furnace according to claim 7, wherein: The heat-insulating plate (211) is formed by splicing together a plurality of heat-insulating blocks that are sequentially arranged along the circumferential direction.

9. The optical fiber preform sintering furnace according to claim 8, wherein: The joints between adjacent heat-insulating blocks are structured in a stepped shape.

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