Processing equipment of high-sealing outdoor alternating-current high-voltage vacuum circuit breaker

Abstract

The processing equipment comprises a feeding rail, and a first heating furnace, a quick cooling chamber, a second heating furnace and a heat preservation chamber which are sequentially arranged along the feeding rail, a plurality of groups of brackets are arranged on the feeding rail, each bracket is composed of a top plate and a bottom plate, and a plurality of jackets are uniformly distributed at the top of each bottom plate; a plurality of inner sleeves are evenly distributed at the bottom of the top plate, through holes are densely distributed in the inner sleeves and the outer sleeves, the inner sleeves and the outer sleeves are coated with wax layers, glaze layers inside and outside the ceramic tubes abut against the wax layers of the outer sleeves and the wax layers of the inner sleeves respectively, and the top plate, the inner sleeves and the bottom plate are matched to clamp the tops and the bottoms of the ceramic tubes. And metallization of the vacuum ceramic tube and vitrification of the glaze surface are completed at the same time, the processing efficiency is high, and the yield is high.

Description

Technical Field

[0001] The invention relates to a processing device for a high-sealed outdoor AC high-voltage vacuum circuit breaker, in particular to a processing device for a vacuum ceramic tube of a high-sealed outdoor AC high-voltage vacuum circuit breaker. Background Art

[0002] The vacuum ceramic tube is an important component of the highly sealed outdoor AC high-voltage vacuum circuit breaker, which directly affects the electrical performance of the vacuum circuit breaker. The vacuum ceramic tube generally needs to be processed by ceramic metallization and a layer of vitrified glaze is added on the outer layer to improve its reliability. In the prior art, the above two processes are generally carried out separately, resulting in low processing efficiency. Moreover, due to repeated heating, fine cracks often appear on the ceramic tube body and the glaze layer, or the glaze layer becomes black during the processing, resulting in a high scrap rate. Summary of the invention

[0003] The object of the present invention is to overcome the deficiencies of the prior art and to provide a processing device which can complete the continuous processing of vacuum ceramic tubes, and can simultaneously complete the metallization of the vacuum ceramic tubes and the vitrification of the glaze, and has a low scrap rate.

[0004] The technical solution of the present invention is: a processing device for a highly sealed outdoor AC high-voltage vacuum circuit breaker, comprising a feeding rail and a first heating furnace, a rapid cooling chamber, a second heating furnace and a holding chamber arranged in sequence along the feeding rail;

[0005] The feeding rail is provided with multiple groups of brackets, which are composed of a top plate and a bottom plate. The top of the bottom plate is evenly distributed with multiple outer sleeves, which are densely covered with through holes, and the inner periphery of the outer sleeves is coated with a wax layer. The bottom of the top plate is evenly distributed with multiple inner sleeves corresponding to the outer sleeves, which are also densely covered with through holes, and the outer periphery of the inner sleeves is coated with a wax layer.

[0006] A plurality of ceramic tubes are inserted into the corresponding outer sleeves, the inner sleeves are inserted into the ceramic tubes, the inner and outer walls of the ceramic tubes are pre-coated with metal paste and glazed, and the inner and outer glaze layers of the ceramic tubes are respectively in contact with the wax layers of the outer sleeves and the inner sleeves;

[0007] The height of the outer sleeve is greater than the height of the ceramic tube. The top of the outer sleeve is also provided with a bell mouth. The bottom of the inner sleeve is in a frustum shape. The top of the inner sleeve is also provided with a limit platform. After the inner sleeve is inserted into the ceramic tube, the limit sleeve abuts against the top of the ceramic tube. The bottom of the inner sleeve is flush with the bottom of the ceramic tube. The top plate, the inner sleeve and the bottom plate cooperate to clamp the top and bottom of the ceramic tube.

[0008] The bottom plate at the bottom of the outer sleeve and the top plate at the top of the inner sleeve are respectively provided with a hole, and the two holes and the hollow part of the inner sleeve form a channel. The top of the top plate and the bottom of the bottom plate are respectively provided with a plurality of groups of heat exchange fins;

[0009] A guide rod is also provided at each of the four corners of the top of the bottom plate, and a guide hole corresponding to each guide rod is provided at each of the four corners of the top plate, and each guide rod passes through the corresponding guide hole;

[0010] The four corners of the bottom of the base plate are respectively provided with insertion holes corresponding to the ends of the guide rods, and two or more groups of brackets are stacked on the feeding rail.

[0011] Furthermore, a dewaxing chamber is provided on the inlet end of the first heating furnace, and the dewaxing chamber utilizes the residual heat from the furnace mouth of the first heating furnace to melt and discharge the wax layers on the inner sleeve and the outer sleeve entering the dewaxing chamber in advance.

[0012] Furthermore, both ends of the first heating furnace, the rapid cooling chamber, the second heating furnace and the insulation chamber are respectively provided with lifting doors, and the feeding rail passes through the first heating furnace, the rapid cooling chamber, the second heating furnace and the insulation chamber in sequence.

[0013] Furthermore, a heat insulation layer is provided between the rapid cooling chamber and the first heating furnace and the second heating furnace.

[0014] Specifically, each group of heat exchange fins is arranged to avoid the positions of the holes.

[0015] Furthermore, the feeding rail is movably connected to a plurality of feeding racks, and the bracket is supported on the feeding racks.

[0016] Furthermore, the rapid cooling chamber is densely covered with cooling pipes, and the cooling pipes are connected to the cooling liquid pool through connecting pipes and a pump body.

[0017] Furthermore, a groove body is respectively provided on both side edges of the bottom plate and the top plate, and two rows of rollers are respectively provided on both sides of the rapid cooling chamber. The inner sides of the rollers abut against the cooling pipes, and when the bracket enters the cooling chamber for cooling, the outer sides of the rollers abut against the groove body.

[0018] Furthermore, the insulation chamber is a lengthened insulation chamber to adapt to the processing rhythm and provide more brackets for insulation in the insulation chamber.

[0019] A process for the processing equipment of the above-mentioned high-sealed outdoor AC high-voltage vacuum circuit breaker comprises the following steps: a bracket with a preset ceramic tube is fed into a first heating furnace along a feeding track, heated to 1450° C.-1490° C. in an oxidizing atmosphere, and kept warm for 1 hour to semi-vitrify the outermost glaze layer of the ceramic tube;

[0020] The bracket that has completed the first heating is output from the first heating furnace to the rapid cooling chamber, and stays in the rapid cooling chamber for 20-50 seconds, so that the glaze layer 14 of the ceramic tube 12 is quickly reduced to 1250° C.-1350° C.;

[0021] The bracket that has completed rapid cooling is output from the rapid cooling chamber to the second heating furnace, heated to 1500°C in a hydrogen recovery atmosphere, and then transported to the insulation chamber for insulation for 3-4 hours. Finally, the ceramic tube is metallized and the glaze layer is completely vitrified. It is then transported to the outside for natural cooling to obtain the final vacuum ceramic tube.

[0022] The beneficial effects of the present invention are: with the corresponding control program, the continuous processing of the vacuum ceramic tube can be completed, and the metallization of the vacuum ceramic tube and the vitrification of the glaze surface can be completed at the same time, and the processing efficiency is high;

[0023] The rapid cooling chamber can quickly cool the ceramic tube to 1250℃.

[0024] -1350℃, to prevent the molybdenum in the metal paste from oxidizing and volatilizing and penetrating into the semi-vitrified glaze layer, causing discoloration of the glaze layer;

[0025] The bracket and the outer and inner sleeves on the bracket can effectively increase the heating or cooling speed of the ceramic tube on the one hand. On the other hand, the ceramic tube mainly exchanges heat with the outside through the inner and outer sleeves. Since a reasonable distance is maintained between the inner and outer sleeves and the ceramic tube, the ceramic tube itself, the metal paste and the glaze layer are evenly heated or cooled, avoiding cracking or fine cracks, which can effectively ensure the final quality of the product.

[0026] The through holes densely distributed on the outer sleeve and the inner sleeve facilitate the contact between the oxidizing atmosphere or the hydrogen reduction atmosphere and the ceramic sleeve, and the through holes also facilitate the discharge of the melted wax layer;

[0027] On the one hand, the wax layer plays a lubricating and barrier role to prevent the ceramic tube from generating severe friction with the inner sleeve or outer sleeve during the placement process and damaging the glaze layer that has been initially dried on the ceramic tube. On the other hand, the wax layer also plays an auxiliary positioning role to ensure that the ceramic tube maintains an appropriate distance from the inner sleeve and the outer sleeve and is concentrically arranged. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the bracket in the present invention;

[0030] Figure 3 yes Figure 2 The structural diagram of the middle A part;

[0031] Figure 4 yes Figure 3 The structural diagram of the middle B part;

[0032] Figure 5 is a schematic structural diagram of the top of the bottom plate of the present invention;

[0033] Figure 6It is a structural schematic diagram of the bottom of the bottom plate of the present invention.

[0034] In the figure: feeding rail 1, first heating furnace 2, rapid cooling chamber 3, second heating furnace 4, insulation chamber 5, bracket 6, top plate 7, bottom plate 8, outer sleeve 9, wax layer 10, inner sleeve 11, ceramic tube 12, metal paste 13, glaze layer 14, bell mouth 15, limit table 16, heat exchange fin 17, guide rod 18, jack 19, dewaxing chamber 20, insulation layer 21, feeding rack 22, trough body 23. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0036] Combination Figure 1-6 As shown, a processing device for a highly sealed outdoor AC high-voltage vacuum circuit breaker comprises a feeding track 1 and a first heating furnace 2, a rapid cooling chamber 3, a second heating furnace 4 and a holding chamber 5 arranged in sequence along the feeding track 1;

[0037] The feeding rail 1 is provided with multiple groups of brackets 6, and the brackets 6 are composed of a top plate 7 and a bottom plate 8. The top of the bottom plate 8 is evenly distributed with multiple outer sleeves 9, and the outer sleeves 9 are densely covered with through holes. The inner periphery of the outer sleeves 9 is coated with a wax layer 10. The bottom of the top plate 7 is evenly distributed with multiple inner sleeves 11 corresponding to the outer sleeves 9, and the inner sleeves 11 are also densely covered with through holes. The outer periphery of the inner sleeves 11 is coated with a wax layer 10.

[0038] A plurality of ceramic tubes 12 are inserted into the corresponding outer sleeves 9, the inner sleeves 11 are inserted into the ceramic tubes 12, the inner and outer walls of the ceramic tubes 12 are pre-coated with metal paste 13 and glazed, and the inner and outer glaze layers 14 of the ceramic tubes 12 are respectively in contact with the wax layers 10 of the outer sleeves 9 and the inner sleeves 11;

[0039] In the above structure, the wax layer 10 plays a role of lubrication and barrier, preventing the ceramic tube 12 from generating severe friction with the inner sleeve 11 or the outer sleeve 9 during the placement process and damaging the glaze layer 14 that has been preliminarily dried on the ceramic tube 12. On the other hand, the ceramic tube 12 needs to maintain a distance from the inner sleeve 11 and the outer sleeve 9 and be concentrically arranged. The wax layer 10 plays a role of auxiliary positioning. When the ceramic tube 12 is heated, the wax layer 10 on the outer sleeve 9 and the inner sleeve 11 will melt and be led out from each through hole, which will not affect the subsequent processing of the ceramic tube 12.

[0040] The height of the outer sleeve 9 is greater than the height of the ceramic tube 12. A bell mouth 15 is also provided at the top of the outer sleeve 9 to facilitate the insertion of the ceramic tube 12. The bottom of the inner sleeve 11 is in a frustum shape to facilitate the insertion of the ceramic tube 12. The top of the inner sleeve 11 is also provided with a stopper 16. After the inner sleeve 11 is inserted into the ceramic tube 12, the stopper abuts against the top of the ceramic tube 12. The bottom of the inner sleeve 11 is flush with the bottom of the ceramic tube 12. The top plate 7, the inner sleeve 11 and the bottom plate 8 cooperate to clamp the top and bottom of the ceramic tube 12 to prevent the ceramic tube 12 from being deflected.

[0041] A hole is also provided on the bottom plate 8 at the bottom of the outer sleeve 9 and the top plate 7 at the top of the inner sleeve 11, and the two holes and the hollow part of the inner sleeve 11 form a channel. A plurality of groups of heat exchange fins 17 are also provided on the top of the top plate 7 and the bottom of the bottom plate 8, respectively. The ceramic tube 12 exchanges heat with the outside through the bottom plate 8, the outer sleeve 9, the top plate 7, and the inner sleeve 11. The above structure can improve the heating or cooling speed of the ceramic tube 12;

[0042] The ceramic tube 12 mainly exchanges heat with the outside through the inner sleeve 11 and the outer sleeve 9. Since a reasonable distance is maintained between the inner sleeve 11, the outer sleeve 9 and the ceramic tube 12, the ceramic tube 12 itself, the metal paste 13 and the glaze layer 14 are uniformly heated or cooled, avoiding cracking or fine cracks, which can effectively ensure the final quality of the product.

[0043] A guide rod 18 is provided at each of the four corners of the top of the bottom plate 8, and guide holes corresponding to the guide rods 18 are provided at each of the four corners of the top plate 7. The guide rods 18 pass through the corresponding guide holes. When the inner sleeves 11 are inserted into the ceramic tubes 12, the top plate 7 is displaced downward by the guidance of the guide rods 18, and the ceramic tubes 12 are positioned by the wax layer 10 in the outer sleeve 9. Therefore, the inner sleeves 11 are easily inserted into the ceramic tubes 12 and the insertion is accurate.

[0044] The four corners of the bottom of the bottom plate 8 are respectively provided with insertion holes 19 corresponding to the ends of the guide rods 18. Two or more groups of brackets 6 are stacked on the feeding rail 1 to process multiple groups of ceramic tubes 12 at the same time.

[0045] The working principle of the above structure is:

[0046] The bracket 6 with the ceramic tube 12 is fed into the first heating furnace 2 along the feeding track 1, and heated to 1450°C-1490°C in an oxidizing atmosphere, and kept warm for 1 hour, so that the outermost glaze layer 14 of the ceramic tube 12 is semi-vitrified;

[0047] The bracket 6 that has completed the first heating is output from the first heating furnace 2 to the rapid cooling chamber 3, and stays in the rapid cooling chamber 3 for 20-50 seconds to rapidly reduce the temperature of the glaze layer 14 of the ceramic tube 12 to 1250° C.-1350° C. The purpose of this process is to prevent the oxidized volatilization of molybdenum in the metal paste 13 from penetrating into the glaze layer 14 and causing the glaze layer 14 to change color;

[0048] The bracket 6 that has completed rapid cooling is output from the rapid cooling chamber 3 and enters the second heating furnace 4, where it is heated to 1500°C in a hydrogen recovery atmosphere, and then transported to the insulation chamber 5 for insulation for 3-4 hours. Finally, the ceramic tube 12 is metallized, and the glaze layer 14 is completely vitrified, and then transported to the outside for natural cooling to obtain the final product of the vacuum ceramic tube 12.

[0049] The beneficial effects of the above structure are: with the corresponding control program, the continuous processing of the vacuum ceramic tube 12 can be completed, and the metallization of the vacuum ceramic tube 12 and the vitrification of the glaze surface can be completed at the same time, and the processing efficiency is high;

[0050] The rapid cooling chamber 3 can rapidly cool the ceramic tube 12 to 1250°C-1350°C, so as to prevent the molybdenum in the metal paste 13 from being oxidized and volatilized and infiltrating into the semi-vitrified glaze layer 14, causing the glaze layer 14 to change color;

[0051] The arrangement of the bracket 6 and the outer sleeve 9 and the inner sleeve 11 on the bracket 6 can, on the one hand, effectively improve the heating or cooling speed of the ceramic tube 12. On the other hand, the ceramic tube 12 mainly exchanges heat with the outside through the inner sleeve 11 and the outer sleeve 9. Since a reasonable spacing is maintained between the inner sleeve 11, the outer sleeve 9 and the ceramic tube 12, the ceramic tube 12 itself, the metal paste 13 and the glaze layer 14 are uniformly heated or cooled, avoiding cracking or fine cracks, and effectively ensuring the final quality of the product.

[0052] The through holes densely distributed on the outer sleeve 9 and the inner sleeve 11 facilitate the contact between the oxidizing atmosphere or the hydrogen reduction atmosphere and the ceramic sleeve, and the through holes also facilitate the discharge of the melted wax layer 10;

[0053] On the one hand, the wax layer 10 plays a lubricating and barrier role to prevent the ceramic tube 12 from generating severe friction with the inner sleeve 11 or the outer sleeve 9 during the insertion process and damaging the glaze layer 14 that has been preliminarily dried on the ceramic tube 12. On the other hand, the wax layer 10 also plays an auxiliary positioning role to ensure that the ceramic tube 12 maintains a suitable spacing with the inner sleeve 11 and the outer sleeve 9 and is concentrically arranged.

[0054] In another embodiment, if Figure 1 As shown, a dewaxing chamber 20 is further provided at the inlet end of the first heating furnace 2. The dewaxing chamber 20 utilizes the residual heat from the furnace mouth of the first heating furnace 2 to melt and fall off the wax layer 10 on the inner sleeve 11 and the outer sleeve 9 entering therein in advance.

[0055] In another embodiment, if Figure 1As shown, both ends of the first heating furnace 2, the rapid cooling chamber 3, the second heating furnace 4 and the insulation chamber 5 are respectively provided with lifting doors, and the feeding rail 1 passes through the first heating furnace 2, the rapid cooling chamber 3, the second heating furnace 4 and the insulation chamber 5 in sequence to realize automatic production.

[0056] In another embodiment, if Figure 1 As shown, a heat insulation layer 21 is further provided between the rapid cooling chamber 3 and the first heating furnace 2 and the second heating furnace 4 .

[0057] In another embodiment, if Figure 6 As shown, each group of heat exchange fins 17 is arranged to avoid the position of each hole.

[0058] In another embodiment, if Figure 1 As shown, the feeding rail 1 is also movably connected to a plurality of feeding racks 22 , and the bracket 6 is supported on the feeding racks 22 .

[0059] In another embodiment, the rapid cooling chamber 3 is densely covered with cooling pipes, and the cooling pipes are connected to the cooling liquid pool through connecting pipes and a pump body.

[0060] In another embodiment, if Figure 2 As shown, a groove body 23 is respectively provided on both side edges of the bottom plate 8 and the top plate 7, and two rows of rollers are respectively provided on both sides of the rapid cooling chamber 3. The inner sides of the rollers abut against the cooling pipes. When the bracket 6 enters the cooling chamber for cooling, the outer sides of the rollers abut against the groove body 23, thereby accelerating the cooling of the bracket 6 without affecting the entry and exit of the bracket 6.

[0061] In another embodiment, the insulation chamber 5 is a lengthened insulation chamber to adapt to the processing rhythm and provide more brackets 6 for insulation in the insulation chamber 5 .

Claims

1. A processing device for a highly sealed outdoor AC high voltage vacuum circuit breaker, characterized in that: It comprises a feeding track (1) and a first heating furnace (2), a rapid cooling chamber (3), a second heating furnace (4) and a holding chamber (5) which are sequentially arranged along the feeding track (1); The feeding rail (1) is provided with a plurality of brackets (6), the brackets (6) being composed of a top plate (7) and a bottom plate (8), the top of the bottom plate (8) being evenly provided with a plurality of outer sleeves (9), the outer sleeves (9) being densely provided with through holes, the inner periphery of the outer sleeves (9) being coated with a wax layer (10), the bottom of the top plate (7) being evenly provided with a plurality of inner sleeves (11) corresponding to the outer sleeves (9), the inner sleeves (11) also being densely provided with through holes, the outer periphery of the inner sleeves (11) being coated with a wax layer (10); A plurality of ceramic tubes (12) are inserted into corresponding outer sleeves (9), the inner sleeve (11) is inserted into the ceramic tube (12), the inner and outer walls of the ceramic tube (12) are pre-coated with metal paste (13) and glazed, and the inner and outer glaze layers (14) of the ceramic tube (12) are respectively in contact with the wax layers (10) of the outer sleeve (9) and the inner sleeve (11); The height of the outer sleeve (9) is greater than the height of the ceramic tube (12); the top of the outer sleeve (9) is also provided with a bell mouth (15); the bottom of the inner sleeve (11) is in the shape of a cone; the top of the inner sleeve (11) is also provided with a stopper (16); after the inner sleeve (11) is inserted into the ceramic tube (12), the stopper sleeve abuts against the top of the ceramic tube (12); the bottom of the inner sleeve (11) is flush with the bottom of the ceramic tube (12); the top plate (7), the inner sleeve (11) and the bottom plate (8) cooperate to clamp the top and bottom of the ceramic tube (12); A hole is also provided on the bottom plate (8) at the bottom of the outer sleeve (9) and the top plate (7) at the top of the inner sleeve (11), respectively. The two holes and the hollow portion of the inner sleeve (11) form a channel. A plurality of groups of heat exchange fins (17) are also provided on the top of the top plate (7) and the bottom of the bottom plate (8); A guide rod (18) is also provided at each of the four corners of the top of the bottom plate (8), and guide holes corresponding to the guide rods (18) are provided at each of the four corners of the top plate (7), and each of the guide rods (18) passes through the corresponding guide hole; The four corners at the bottom of the base plate (8) are respectively provided with insertion holes (19) corresponding to the ends of the guide rods (18), and two or more groups of brackets (6) are stacked and arranged on the feeding rail (1).

2. The processing equipment of a highly sealed outdoor AC high voltage vacuum circuit breaker according to claim 1, characterized in that: A dewaxing chamber (20) is also provided at the inlet end of the first heating furnace (2). The dewaxing chamber (20) utilizes the residual heat from the furnace mouth of the first heating furnace (2) to melt the wax layer (10) on the inner sleeve (11) and the outer sleeve (9) entering the dewaxing chamber in advance and discharge the wax layer (10).

3. The processing equipment of a highly sealed outdoor AC high voltage vacuum circuit breaker according to claim 2, characterized in that: Both ends of the first heating furnace (2), the rapid cooling chamber (3), the second heating furnace (4) and the insulation chamber (5) are respectively provided with lifting doors, and the feeding rail (1) passes through the first heating furnace (2), the rapid cooling chamber (3), the second heating furnace (4) and the insulation chamber (5) in sequence.

4. The processing equipment of a highly sealed outdoor AC high voltage vacuum circuit breaker according to claim 3 is characterized in that: A heat insulation layer (21) is also provided between the rapid cooling chamber (3) and the first heating furnace (2) and the second heating furnace (4).

5. The processing equipment of a highly sealed outdoor AC high voltage vacuum circuit breaker according to claim 4, characterized in that: Each group of heat exchange fins (17) is arranged to avoid the position of each hole.

6. A processing device for a highly sealed outdoor AC high voltage vacuum circuit breaker as claimed in claim 5, characterized in that: The feeding rail (1) is also movably connected to a plurality of feeding racks (22), and the bracket (6) is supported on the feeding racks (22).

7. A processing device for a highly sealed outdoor AC high voltage vacuum circuit breaker as claimed in claim 6, characterized in that: The rapid cooling chamber (3) is densely covered with cooling pipes, and the cooling pipes are connected to the cooling liquid pool via connecting pipes and a pump body.

8. The processing equipment of a highly sealed outdoor AC high voltage vacuum circuit breaker according to claim 7, characterized in that: A groove body (23) is respectively provided on both side edges of the bottom plate (8) and the top plate (7), and two rows of rollers are respectively provided on both sides of the quick cooling chamber (3), the inner sides of the rollers abut against the cooling pipes, and when the bracket (6) enters the cooling chamber for cooling, the outer sides of the rollers abut against the groove body (23).

9. A processing device for a highly sealed outdoor AC high voltage vacuum circuit breaker as claimed in claim 8, characterized in that: The insulation chamber (5) is a lengthened insulation chamber to adapt to the processing rhythm and provide more brackets (6) for insulation in the insulation chamber (5).

10. A process for supporting a processing device for a highly sealed outdoor AC high voltage vacuum circuit breaker as claimed in claim 1, characterized in that: The steps include: The bracket (6) with the ceramic tube (12) is fed into the first heating furnace (2) along the feeding track (1), and heated to 1450°C-1490°C in an oxidizing atmosphere and kept at this temperature for 1 hour, so that the outermost glaze layer (14) of the ceramic tube (12) is semi-vitrified; The bracket (6) that has completed the first heating is output from the first heating furnace (2) to the rapid cooling chamber (3), and stays in the rapid cooling chamber (3) for 20-50 seconds, so that the glaze layer (14) of the ceramic tube (12) is quickly reduced to 1250° C.-1350° C.; The bracket (6) that has completed rapid cooling is output from the rapid cooling chamber (3) and enters the second heating furnace (4), where it is heated to 1500° C. in a hydrogen recovery atmosphere, and then transported to the insulation chamber (5) for insulation for 3-4 hours. Finally, the ceramic tube (12) is metallized and the glaze layer (14) is completely vitrified. The bracket is then transported to the outside for natural cooling, thereby obtaining the final product of the vacuum ceramic tube.

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