Melting equipment and melting process for continuously melting transparent quartz glass ingot by gas refining

Abstract

The melting equipment comprises a furnace shell provided with an observation window, a heat insulation and preservation layer, a hearth and a furnace body provided with a feeding port, a solution pool is arranged on the lower portion of an inner cavity of the hearth, and the bottom of the solution pool extends downwards to be provided with a forming channel; one side of the furnace body is provided with a multidirectional flue located above the solution pool and connected with a first draught fan, the periphery of the forming channel in the vertical direction is sequentially provided with a heat preservation cavity located on the lower portion of the hearth and connected to the multidirectional flue, and a cooling cavity located below the hearth, and a thermocouple and an electric heating wire surrounding the outer wall of the forming channel are arranged in the heat preservation cavity. And a slow descending mechanism for enabling the quartz glass ingot to slowly descend and grow is arranged right below the forming channel. The production diversity of products can be improved, the temperature in the heat preservation cavity can be stably and accurately controlled, the heat preservation cavity, the cooling cavity and the rapid cooling cavity are used for carrying out gradient cooling on quartz glass ingots, the forming quality of the quartz glass ingots is guaranteed, and the production efficiency of the quartz glass ingots is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of quartz glass gas refining, in particular to a melting device and a melting process for continuously melting transparent quartz glass ingots by gas refining. Background Art

[0002] Gas refining of quartz ingots is currently one of the primary technologies used to produce quartz glass ingots. Quartz glass produced using this gas refining method boasts high purity, minimal bubbles, and high product quality. Existing gas refining technology involves heating a base ingot in an open-bottomed furnace using an oxyhydrogen burner at the top and feeding it with material. The oxyhydrogen burner melts the quartz powder and deposits the melted material onto the base ingot, which is then lowered within a forming channel to form a cylindrical quartz ingot. Quartz ingots formed using traditional gas refining technology typically range in height from 300mm to 600mm. To increase the height and shorten the forming time of quartz glass ingots, the gas refining continuous melting process for quartz glass ingots has become an industry research priority.

[0003] The applicant's prior patent document with publication number CN220597292U discloses "a furnace structure for producing long-sized quartz ingots". The furnace depth is increased, and an insulation chamber and a cooling chamber are set below the furnace. The high-temperature flue gas in the furnace is used for insulation. While ensuring the molding quality, quartz ingot products with higher height can be produced, the specification length of the produced quartz ingots is improved, and the formed quartz ingots can be cut during the lifting process, thereby realizing the continuous melting of quartz glass ingots, reducing energy consumption, saving the growth time of quartz ingots, and improving the production efficiency of quartz ingots. However, the product specifications produced by this technical solution are relatively simple, and it uses the high-temperature flue gas in the furnace to insulate the insulation cavity outside the forming channel. Since the temperature of the high-temperature flue gas is not stable, the molten quartz glass at the upper part of the forming channel may produce defects such as bubbles and ripples due to excessively high or low temperature, affecting the forming quality of the quartz glass ingot; at the same time, when the downward high-temperature flue gas flows into the insulation cavity, the impurities contained in the high-temperature flue gas are likely to have an adverse effect on the quartz glass ingot at the upper end of the forming channel, resulting in poor forming quality of the quartz glass ingot. Summary of the Invention

[0004] In order to solve the technical problems in the prior art that the product specifications produced by the existing furnace structure are relatively single, the temperature of the high-temperature flue gas is unstable, and the impurities contained in the high-temperature flue gas cause the quartz glass ingot molding quality to be poor, the present invention provides the following technical solutions.

[0005] The present invention provides melting equipment for continuously melting transparent quartz glass ingots by gas refining, comprising a furnace shell provided with an observation window, a thermal insulation layer, a furnace chamber, and a furnace body having a feed port. A solution pool is provided at the lower portion of the furnace chamber inner cavity, and a forming channel is provided downwardly extending from the bottom of the solution pool. A multi-directional flue connected to a first blower is provided on one side of the furnace body, and is located above the solution pool. A heat preservation chamber located at the lower portion of the furnace chamber and connected to the multi-directional flue and located below the furnace chamber are sequentially provided on the upper and lower peripheries of the forming channel. A thermocouple and a heating wire surrounding the outer wall of the forming channel are provided in the heat preservation chamber. A slow-descent mechanism for slowly descending and growing the quartz glass ingot is provided directly below the forming channel.

[0006] As a further technical solution, the multi-directional flue includes an exhaust flue connected to the first fan and a thermal insulation flue connected to the thermal insulation chamber.

[0007] As a further technical solution, the heat preservation chamber is provided with an overflow channel communicating with the cooling chamber, and the cooling chamber is provided with a gas outlet connected to an external fan.

[0008] As a further technical solution, the molding channel is connected to a detachable molding tube, which includes a molding wall that fits the inner wall of the molding channel, and the upper and lower ends of the molding wall are respectively connected to an inflow part connected to the solution pool and a detachment part with a gradually increasing inner diameter.

[0009] As a further technical solution, a quick cooling chamber is provided below the cooling chamber, and the quick cooling chamber is connected to a second fan.

[0010] As a further technical solution, a processing bracket is fixedly connected to the lower end of the furnace body, and the processing bracket is connected to a first lifting component and a second lifting component distributed above and below. The first lifting component and the second lifting component are respectively provided with a first clamping ring and a second clamping ring that can clamp the quartz glass ingot. The first lifting component and the second lifting component have the same descending speed as the slow-descent mechanism.

[0011] As a further technical solution, a cutting component for cutting the quartz glass ingot is provided at the lower portion of the second lifting component and can move horizontally along the second lifting component.

[0012] The present invention also includes a melting process for continuously melting a transparent quartz glass ingot by gas refining, comprising the following steps:

[0013] S1: The descending mechanism carries a bottom ingot that matches the forming channel and rises to the lower end of the forming channel. At the same time, the oxyhydrogen burner is installed at the feed port, and the quartz powder silo is filled with quartz powder raw materials;

[0014] S2: Preheat the furnace, molten pool and forming channel. During the preheating process, the slow-down mechanism pushes the bottom ingot up to the upper end of the forming channel;

[0015] S3: When the temperature in the furnace reaches above 1750℃, the oxyhydrogen burner continues to burn and melt the quartz powder raw material, and the liquid quartz glass solution flows onto the bottom ingot. At the beginning, the feeding rate is 6-10 grams per minute. The melting of the quartz powder raw material is observed through the observation window. When the raw material is well melted, the ingot surface is smooth and transparent, and there are no bubbles, the feeding rate is increased by 1g-3g per minute as the temperature in the furnace rises, until the feeding rate increases to 30g-35g per minute;

[0016] S4: When the quartz powder raw material is fully melted and overflows from the bottom ingot into the molten pool, the slow-down mechanism drives the bottom ingot to slowly rotate and descend, and the temperatures of the heat preservation chamber and the cooling chamber are monitored in real time until the formed quartz glass ingot descends to the bottom of the forming channel along with the slow-down mechanism;

[0017] S5: When the slow-down mechanism pulls the quartz glass ingot down to the first lifting component and the second lifting component, the first lifting component and the second lifting component clamp the quartz glass ingot and maintain the same rotation and descending speed as the slow-down mechanism. At the same time, the cutting component cuts off the bottom ingot. Then, according to the set cutting length of the quartz glass ingot, the second lifting component releases the quartz glass ingot and drives the cutting component to move upward. After moving to the cutting length, the second lifting component clamps the quartz glass ingot and enables the cutting component to cut the quartz glass ingot. After cutting, the second lifting component continues to pull the quartz glass ingot, and the first lifting component moves upward and continues to pull the quartz glass ingot. This is repeated to complete the continuous melting and cutting of the quartz glass ingot.

[0018] As a further technical solution, in step S2, a small amount of hydrogen and oxygen is first introduced into the hydrogen and oxygen burner to preheat the furnace, the melt pool and the forming channel. The total amount of hydrogen and oxygen is gradually increased from 5 cubic meters per hour, first quickly heated to 1200°C, and then the temperature in the furnace is preheated to above 1750°C at a heating rate of 10-20°C per hour. After stabilization, the total amount of hydrogen and oxygen is 35 cubic meters per hour, and the hydrogen and oxygen ratio is 2:1.

[0019] As a further technical solution, in step S4, the air extraction volume of the first fan to the multi-directional flue and the air output volume of the air outlet are adjusted according to the temperatures monitored in real time by the thermocouples in the heat preservation chamber and the cooling chamber.

[0020] The beneficial effects of the present invention are as follows: the molding channel of the melting arrangement of the present invention is equipped with a detachable molding tube, which can be replaced with detachable molding tubes of different specifications according to the shape of the required quartz glass ingot, thereby improving the diversity of product production. A multi-directional flue is provided on one side of the furnace body above the solution pool, and the multi-directional flue extends with an exhaust flue connected to the first fan and an insulation flue connected to the insulation chamber, which can control the circulation of high-temperature flue gas to prevent the high-temperature flue gas from causing adverse effects on the quartz glass solution in the solution pool, so that the high-temperature flue gas is discharged or discharged to the insulation chamber for insulation, and cooperates with the heating wire and thermocouple in the insulation chamber to achieve stable and precise control of the temperature in the insulation chamber, thereby ensuring the molding quality of the quartz glass ingot. At the same time, the insulation chamber, the cooling chamber and the rapid cooling chamber cool the quartz glass ingot in stages, ensuring the rapid molding and cutting of the quartz glass ingot, and improving the production efficiency of the quartz glass ingot. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic planar cross-sectional view of a melting apparatus for continuously melting a transparent quartz glass ingot by gas refining according to the present invention;

[0022] Figure 2 yes Figure 1 A magnified schematic diagram of part A in the middle;

[0023] In the figure: 1-furnace body; 101-furnace shell; 102-thermal insulation layer; 103-furnace chamber; 104-feed port; 105-observation window; 2-multi-directional flue; 201-exhaust flue; 202-insulation flue; 3-first fan; 4-molten pool; 5-forming channel; 6-detachable forming tube; 601-inflow part; 602-forming wall; 603-detachment part; 7-insulation chamber; 701-overflow pipe; 8-cooling chamber; 9-rapid cooling chamber; 10-first lifting component; 11-first clamping ring; 12-second lifting component; 13-second clamping ring; 14-cutting component; 15-processing bracket; 16-gas outlet; 17-second fan; 18-heating wire; 19-thermocouple. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. It should be noted that, unless there is a conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0025] In the description of the present invention, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features referred to. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0026] like Figure 1 As shown, the present invention discloses a melting apparatus for continuously melting transparent quartz glass ingots using a gas refining process. The apparatus comprises a furnace body 1 comprising a furnace shell 101 with an observation window 105, a thermal insulation layer 102, a furnace chamber 103, and a feed port 104. A processing support 15 is fixedly connected to the bottom of the furnace body 1. The feed port 104 is used to install an oxyhydrogen burner and feed materials. The thermal insulation layer 102 and the furnace chamber 103 utilize existing technologies, and their structures and the refractory and insulation materials used are not described in detail. An observation window 105 extending through the sidewall of the furnace body 1 and extending into the furnace chamber 103 allows observation of the melting of the quartz powder raw material within the furnace chamber 103.

[0027] like Figure 1 and Figure 2 As shown, in a preferred embodiment, a solution pool 4 is provided at the lower portion of the inner cavity of the furnace 103. The solution pool 4 is made of high-temperature resistant zirconia bricks and is used to temporarily store molten quartz glass solution. A forming channel 5 extends downward from the bottom of the solution pool 4. The quartz glass solution in the solution pool 4 flows into the forming channel 5, which is used to form the quartz glass ingot. A descending mechanism is provided directly below the forming channel 5 to allow the quartz glass ingot to slowly descend and grow. The descending mechanism utilizes existing technology, with a bottom ingot at its top. The bottom ingot is melted by the oxyhydrogen burner and merged with the molten quartz glass solution. The descending mechanism then pulls the bottom ingot, allowing the quartz glass ingot to slowly descend and grow along the forming channel 5.

[0028] In a preferred embodiment, the forming channel 5 itself can be used to form a quartz glass ingot, and the forming channel 5 can be connected to a detachable forming tube 6, with a portion of the detachable forming tube 6 located within the solution pool 4 and a portion extending into the forming channel 5. Specifically, the detachable forming tube 6 includes a forming wall 602 that conforms to the inner wall of the forming channel 5. Depending on the specifications and shapes of the desired quartz glass ingot, the forming wall 602 can be designed in a variety of different specifications and shapes to facilitate diversified product production. The upper and lower ends of the forming wall 602 are respectively connected to an inlet portion 601 connected to the solution pool 4 and a detachment portion 603 with a gradually increasing inner diameter. The inlet portion 601 is used to allow the quartz glass solution to flow slowly and smoothly into the forming wall 602, and the detachment portion 603 facilitates the smooth detachment of the formed quartz glass ingot from the forming wall 602. After the forming wall 602 is inserted into the forming channel 5, the inlet portion 601 is fixed to the solution pool 4 via high-temperature resistant bolts.

[0029] In a preferred embodiment, a multi-directional flue 2 connected to a first fan 3 and extending through the furnace 103 is provided on one side of the furnace body 1. A heat preservation chamber 7 located at the bottom of the furnace 103 and a cooling chamber 8 located below the furnace 103, both connected to the multi-directional flue 2, are provided along the upper and lower peripheries of the forming channel 5. The multi-directional flue 2 includes an exhaust flue 201 connected to the first fan 3 and a heat preservation flue 202 connected to the heat preservation chamber 7. High-temperature flue gas flows from the heat preservation flue 202 into the heat preservation chamber 7, providing a corresponding temperature for the heat preservation chamber 7 and ensuring a stable temperature within the forming channel 5. The heat preservation chamber 7 is provided with an overflow channel 701 connected to the cooling chamber 8. The cooling chamber 8 is also provided with a gas outlet 16 connected to an external fan. High-temperature flue gas within the heat preservation chamber 7 can escape into the cooling chamber 8, keeping the temperature within the cooling chamber 8 slightly lower than that of the heat preservation chamber 7, thereby ensuring the quality of the quartz glass ingot formed within the forming channel 5.

[0030] In a preferred embodiment, a thermocouple 19 and a heating wire 18 surrounding the outer wall of the forming channel 5 are provided in the heat preservation chamber 7, and a thermocouple is also provided in the cooling chamber 8 for real-time temperature monitoring. When the temperature in the heat preservation flue 202 is sufficient to provide a stable high temperature for the heat preservation chamber 7, the first fan 3 is not started and the heating wire 18 is not started; when the thermocouple 19 detects that the temperature in the heat preservation chamber 7 is too high, the first fan 3 is started to extract the high-temperature flue gas from the heat preservation flue 202 and the heat preservation chamber 7, and the slightly lower temperature in the cooling chamber 8 is used to cool the heat preservation chamber 7; when the thermocouple 19 detects that the temperature in the heat preservation chamber 7 is too low, the first fan 3 is not started, and the heating wire 18 is started at the same time to heat the heat preservation chamber 7.

[0031] In a preferred embodiment, a rapid cooling chamber 9 is provided below the cooling chamber 8, and the rapid cooling chamber 9 is connected to a second fan 17. The second fan 17 draws air at room temperature to cool the rapid cooling chamber 9. The cooling temperature is not limited. The rapid cooling chamber 9 can quickly cool the quartz glass ingot that has been stably formed after passing through the insulation chamber 7 and the cooling chamber 8, thereby facilitating the subsequent processing and cutting of the quartz glass ingot.

[0032] In a preferred embodiment, a processing bracket 15 is fixedly connected to the lower end of the furnace body 1, and the processing bracket 15 is connected to a first lifting component 10 and a second lifting component 12 distributed above and below. The first lifting component 10 and the second lifting component 12 can move up and down relative to the processing bracket 5. The first lifting component 10 and the second lifting component 12 are respectively provided with a first clamping ring 11 and a second clamping ring 13 that can clamp the quartz glass ingot. When the first clamping ring 11 and the second clamping ring 13 are raised and lowered with the first lifting component 10 and the second lifting component 12, they can simultaneously rotate relative to the first lifting component 10 and the second lifting component 12, and the first lifting component 10 and the second lifting component 12 descend at the same speed as the slow-descent mechanism, which facilitates the first clamping ring 11 and the second clamping ring 13 to stably clamp the quartz glass ingot.

[0033] A cutting component 14 for cutting the quartz glass ingot is provided at the lower portion of the second lifting component 12 and can move horizontally along the second lifting component 12. The first lifting component 10 and the second lifting component 12 as well as the first clamping ring 11 and the second clamping ring 13 all adopt existing technologies and are not described in detail here.

[0034] The present invention also includes a melting process for continuously melting a transparent quartz glass ingot by gas refining, comprising the following steps:

[0035] S1: The descending mechanism carries a bottom ingot matching the forming channel 5 and ascends to the lower end of the forming channel 5. At the same time, an oxyhydrogen burner is installed at the feed port 104, and the quartz powder silo is filled with quartz powder raw material. Depending on the specifications of the quartz glass ingot to be melted, the number of oxyhydrogen burners installed can be only one or multiple, and the present invention does not impose any particular limitation thereto.

[0036] S2: Preheating the furnace 103, the molten pool 4 and the forming channel 5. During the preheating process, the slow-down mechanism pushes the bottom ingot up to the upper end of the forming channel 5;

[0037] In this step S2, first, a small amount of hydrogen and oxygen is introduced into the hydrogen and oxygen burner to preheat the furnace 103, the molten pool 4 and the forming channel 5. The total amount of hydrogen and oxygen is gradually increased from 5 cubic meters per hour, first quickly heated to 1200°C, and then the temperature in the furnace 103 is preheated to above 1750°C at a heating rate of 10-20°C per hour. After stabilization, the total amount of hydrogen and oxygen is 35 cubic meters per hour, and the hydrogen and oxygen ratio is 2:1.

[0038] S3: When the temperature in the furnace 103 reaches above 1750°C, the oxyhydrogen burner continues to burn and melt the quartz powder raw material, and the liquid quartz glass solution flows onto the bottom ingot. The initial feeding rate is 6-10 grams per minute. The melting of the quartz powder raw material is observed through the observation window 105. When the raw material is well melted, the ingot surface is smooth and transparent, and there are no bubbles, the feeding rate is increased by 1g-3g per minute as the temperature in the furnace 103 rises, until the feeding rate is increased to 30g-35g per minute;

[0039] S4: When the quartz powder raw material is fully melted and overflows from the bottom ingot into the molten pool 4, the slow-down mechanism drives the bottom ingot to slowly rotate and descend, and the temperatures of the heat preservation chamber 7 and the cooling chamber 8 are monitored in real time until the formed quartz glass ingot descends to the bottom of the forming channel 5 along with the slow-down mechanism;

[0040] In this step S4, the air extraction volume of the first fan 3 to the multi-directional flue 2 and the air output volume of the air outlet 16 are adjusted according to the temperature monitored in real time by the thermocouple 19 in the heat preservation chamber 7 and the cooling chamber 8. In this step, the temperature in the heat preservation chamber 7 is 1650-1700°C, and the temperature in the cooling chamber 8 is 1200-1600°C. When the temperature in the heat preservation flue 202 is sufficient to provide a stable high temperature for the heat preservation chamber 7, the first fan 3 is not started, and the heating wire 18 is not started either. When the thermocouple 19 detects that the temperature in the heat preservation chamber 7 is too high, the first fan 3 is started to extract the high-temperature flue gas from the heat preservation flue 202 and the heat preservation chamber 7, and the slightly lower temperature in the cooling chamber 8 is used to cool the heat preservation chamber 7. When the thermocouple 19 detects that the temperature in the heat preservation chamber 7 is too low, the first fan 3 is not started, and the heating wire 18 is started at the same time to heat the heat preservation chamber 7.

[0041] S5: The slow-down mechanism pulls the quartz glass ingot down. The speed of the slow-down mechanism is consistent with the speed of melting a single quartz glass ingot, so its details are omitted. When the quartz glass ingot descends to the first and second lifting components 10, 12, they activate the first and second clamping rings 11, 13, respectively, to clamp the quartz glass ingot. The first and second lifting components 10, 12 maintain the same rotational and descending speed as the slow-down mechanism, while the cutting component 14 removes the bottom ingot.

[0042] Then, according to the set cutting length of the quartz glass ingot, the second lifting component 12 releases the quartz glass ingot and drives the cutting component 14 to move upward. After moving to the cutting length, the second lifting component 12 clamps the quartz glass ingot and causes the cutting component 14 to cut the quartz glass ingot. After cutting, the second lifting component 12 continues to pull the quartz glass ingot, and the first lifting component 10 moves upward and continues to pull the quartz glass ingot. This process is repeated to complete the continuous melting and cutting of the quartz glass ingot.

[0043] The preferred specific implementation modes and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above implementation modes and embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments that fall within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A melting device for continuously melting transparent quartz glass ingots by gas refining, comprising a furnace shell (101) provided with an observation window (105), a heat insulation layer (102), a furnace chamber (103) and a feed port (104) of the furnace body (1), characterized in that: A solution pool (4) is provided at the lower part of the inner cavity of the furnace (103); a forming channel (5) is provided at the bottom of the solution pool (4) extending downward; a multi-directional flue (2) connected to a first fan (3) and located above the solution pool (4) is provided on one side of the furnace body (1); a heat preservation chamber (7) located at the lower part of the furnace (103) and connected to the multi-directional flue (2) and a cooling chamber (8) located below the furnace (103) are provided in sequence on the outer periphery in the upper and lower directions of the forming channel (5); a thermocouple (19) and an electric heating wire (18) surrounding the outer wall of the forming channel (5) are provided in the heat preservation chamber (7); and a slow-down mechanism for slowly descending and growing the quartz glass ingot is provided directly below the forming channel (5).

2. The melting equipment for continuously melting transparent quartz glass ingots by gas refining according to claim 1, characterized in that: The multi-directional flue (2) comprises an exhaust flue (201) connected to the first fan (3) and a heat preservation flue (202) connected to the heat preservation chamber (7).

3. The melting equipment for continuously melting transparent quartz glass ingots by gas refining according to claim 1, characterized in that: The heat preservation chamber (7) is provided with an overflow channel (701) communicating with the cooling chamber (8), and the cooling chamber (8) is provided with a gas outlet (16) connected to an external fan.

4. The melting equipment for continuously melting transparent quartz glass ingots by gas refining according to claim 1, characterized in that: The molding channel (5) is connected to a detachable molding tube (6), and the detachable molding tube (6) comprises a molding wall (602) that fits the inner wall of the molding channel (5), and the upper and lower ends of the molding wall (602) are respectively connected to an inflow portion (601) connected to the solution pool (4) and a detachment portion (603) with a gradually increasing inner diameter.

5. The melting equipment for continuously melting transparent quartz glass ingots by gas refining according to claim 1, characterized in that: A quick cooling chamber (9) is provided below the cooling chamber (8), and the quick cooling chamber (9) is connected to a second fan (17).

6. The melting equipment for continuously melting transparent quartz glass ingots by gas refining according to claim 1, characterized in that: The lower end of the furnace body (1) is fixedly connected to a processing support (15), and the processing support (15) is connected to a first lifting component (10) and a second lifting component (12) which are distributed up and down, and the first lifting component (10) and the second lifting component (12) are respectively provided with a first clamping ring (11) and a second clamping ring (13) which can clamp the quartz glass ingot, and the first lifting component (10) and the second lifting component (12) have the same descending speed as the slow descending mechanism.

7. The melting equipment for continuously melting transparent quartz glass ingots by gas refining according to claim 6, characterized in that: A cutting component (14) for cutting a quartz glass ingot is provided at the lower part of the second lifting component (12) and is movable in the horizontal direction of the second lifting component (12).

8. A melting process for continuously melting transparent quartz glass ingots by gas refining, characterized in that: The following steps are included S1: The slow-down mechanism carries a bottom ingot matching the forming channel (5) and rises to the lower end of the forming channel (5), and at the same time, the hydrogen-oxygen burner is installed at the feed port (104), and the quartz powder silo is filled with quartz powder raw materials; S2: preheating the furnace (103), the molten pool (4) and the forming channel (5). During the preheating process, the slow-down mechanism pushes the bottom ingot to rise to the upper end of the forming channel (5); S3: When the temperature in the furnace (103) reaches above 1750°C, the hydrogen-oxygen burner continues to burn and melt the quartz powder raw material, and the liquid quartz glass solution flows onto the bottom ingot. At the beginning, the feeding amount is 6-10 grams per minute, and the melting of the quartz powder raw material is observed through the observation window (105). When the raw material is well melted, the ingot surface is smooth and transparent, and there are no bubbles, as the temperature in the furnace (103) rises, the feeding amount is increased by 1g-3g per minute until the feeding amount increases to 30g-35g per minute; S4: When the quartz powder raw material is fully melted and overflows from the bottom ingot into the molten pool (4), the slow-down mechanism drives the bottom ingot to slowly rotate and descend, and the temperatures of the heat preservation chamber (7) and the cooling chamber (8) are monitored in real time until the formed quartz glass ingot descends to the bottom of the forming channel (5) along with the slow-down mechanism; S5: When the slow-down mechanism pulls the quartz glass ingot down to the first lifting component (10) and the second lifting component (12), the first lifting component (10) and the second lifting component (12) clamp the quartz glass ingot and maintain the same rotation and descending speed as the slow-down mechanism, and at the same time the cutting component (14) cuts off the bottom ingot. Then, according to the set cutting length of the quartz glass ingot, the second lifting component (12) releases the quartz glass ingot and drives the cutting component (14) to move upward. After moving to the cutting length, the second lifting component (12) clamps the quartz glass ingot and enables the cutting component (14) to cut the quartz glass ingot. After cutting, the second lifting component (12) continues to pull the quartz glass ingot, and the first lifting component (10) moves upward and continues to pull the quartz glass ingot. In this way, continuous melting and cutting of the quartz glass ingot are completed repeatedly.

9. The melting process of the transparent quartz glass ingot by continuous melting of gas refining according to claim 8, characterized in that: In the step S2, a small amount of hydrogen and oxygen is first introduced into the hydrogen and oxygen burner to preheat the furnace (103), the molten pool (4) and the forming channel (5). The total amount of hydrogen and oxygen is gradually increased from 5 cubic meters per hour, first quickly heated to 1200° C., and then the temperature in the furnace 103 is preheated to above 1750° C. at a heating rate of 10-20° C. per hour. After stabilization, the total amount of hydrogen and oxygen is 35 cubic meters per hour, and the ratio of hydrogen and oxygen is 2:

1.

10. The melting process of the transparent quartz glass ingot by continuous melting of gas refining according to claim 8, characterized in that: In the step S4, the air extraction volume of the multi-directional flue (2) by the first fan (3) and the air output volume of the air outlet (16) are adjusted according to the temperature monitored in real time by the thermocouples (19) in the heat preservation chamber (7) and the cooling chamber (8).

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