Furnace bottom structure for infrared optical glass melting furnace

Abstract

The utility model relates to the technical field of melting furnaces, in particular to a furnace bottom structure for an infrared optical glass melting furnace, which comprises a supporting plate part, a first heat insulation round brick, a furnace bottom supporting plate and a second heat insulation round brick, the first heat insulation layer is arranged between the first heat insulation round bricks and the bottom plate; the crucible fixing part comprises a second heat-insulating round brick nested on one side, deviating from the bottom plate, of the first heat-insulating round brick, a crucible support nested on one side, deviating from the bottom plate, of the second heat-insulating round brick, and a crucible claw group arranged on one side, deviating from the bottom plate, of the crucible support; and the eccentric opening penetrates through the crucible fixing part and the supporting plate part and is deviated from the center line of the furnace bottom structure. According to the utility model, the eccentric opening is formed in the furnace bottom structure, so that the straight channel pouring design of the vertical furnace is realized, the performance of a poured plastic solution is uniform and controllable, devitrification is not generated, and the yield of products is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of melting furnaces, in particular to a furnace bottom structure used for an infrared optical glass melting furnace. Background Art

[0002] Currently, the working range of optical materials used in many sensors and laser system equipment is concentrated in the mid-infrared band, and infrared optical glass is needed for protection. At present, infrared optical glass mainly includes heavy metal oxide glass and fluoride glass, which are formed by melting or molten salt. The melting process needs to be carried out in an infrared optical glass melting furnace.

[0003] The melting chamber of the infrared optical glass melting furnace currently used in industrial production has a small volume and cannot be used for large-scale production. The reason is that the casting structure of most melting furnaces adopts a dumping type or a diversion type.

[0004] The pouring type requires the entire melting chamber or crucible to be rotated and poured through a rotating system to pour the molten glass inside. Generally, this method is very likely to cause more cracks or crystallization in the cast glass, reducing the product yield and cannot be applied to the material requirements of optical equipment. The diversion type is to divert and pour in separate troughs at the bottom of the bottom furnace. During the diversion process, the molten glass is likely to contact the relatively cold trough wall and cause rapid cooling, resulting in more crystallization and stripes in the cast glass, making the material properties directional, or causing uneven glass composition and greater stress, which is not conducive to subsequent processing and affects the optical uniformity of the optical glass.

[0005] Therefore, it is necessary to improve and develop the bottom structure of the melting furnace. Utility Model Content

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a furnace bottom structure for an infrared optical glass melting furnace, aiming to solve the problems that the furnace bottom of the existing melting furnace is immobile and optical glass cast by pouring or diversion casting has cracks, crystallization and other problems.

[0007] The technical solution of the utility model is as follows:

[0008] A furnace bottom structure for an infrared optical glass melting furnace, comprising:

[0009] The support plate part comprises a bottom plate, a first heat-insulating round brick arranged on the bottom plate, a furnace bottom support plate sleeved on the first heat-insulating round brick and in contact with the bottom plate, and a first heat-insulating layer arranged between the first heat-insulating round brick and the bottom plate;

[0010] The crucible fixing part includes a second heat-insulating round brick nested in the first heat-insulating round brick on the side away from the bottom plate, a crucible holder nested in the second heat-insulating round brick on the side away from the bottom plate, and a crucible claw group arranged on the side of the crucible holder away from the bottom plate;

[0011] An eccentric opening is provided, wherein the eccentric opening penetrates the crucible fixing portion and the supporting plate portion and is arranged deviating from the center line of the furnace bottom structure.

[0012] The furnace bottom structure for the infrared optical glass melting furnace, wherein the distance from the center of the eccentric opening to the center line of the furnace bottom structure is 34-40 mm.

[0013] The furnace bottom structure for the infrared optical glass melting furnace, wherein the eccentric opening is circular; and the diameter of the eccentric opening is 85-95 mm.

[0014] The furnace bottom structure for the infrared optical glass melting furnace, wherein the crucible claw group includes a plurality of first crucible claws, a plurality of second crucible claws, and a plurality of third crucible claws; the length of the first crucible claw is greater than the length of the second crucible claw, and the length of the second crucible claw is greater than the length of the third crucible claw.

[0015] The furnace bottom structure for the infrared optical glass melting furnace, wherein the first crucible claw, the second crucible claw and the third crucible claw are equidistantly arranged on a side of the crucible support away from the bottom plate.

[0016] The furnace bottom structure for an infrared optical glass melting furnace, wherein the crucible claw group includes three first crucible claws, two second crucible claws and one third crucible claw; the three first crucible claws are arranged on a side of the eccentric opening close to the center line of the furnace bottom structure, the third crucible claw is arranged on a side of the eccentric opening away from the center line of the furnace bottom structure, and the two second crucible claws are respectively arranged between the first crucible claws and the third crucible claws.

[0017] The furnace bottom structure for the infrared optical glass melting furnace, wherein the length of the first crucible claw is 100-110 mm; the length of the second crucible claw is 65-75 mm; and the length of the third crucible claw is 45-55 mm.

[0018] The furnace bottom structure for the infrared optical glass melting furnace is characterized in that a second heat insulation layer is provided on the side of the furnace bottom support plate facing away from the bottom plate, and the second heat insulation layer is also attached to the periphery of the first heat insulation round brick.

[0019] The furnace bottom structure for an infrared optical glass melting furnace, wherein a plurality of loading positions are provided on the side of the crucible support away from the bottom plate, and the loading positions are used to load the crucible claw group; the horizontal height of the loading position away from the center line of the furnace bottom structure is higher than the horizontal height close to the center line of the furnace bottom structure.

[0020] The furnace bottom structure for the infrared optical glass melting furnace is as follows: the first thermal insulation round brick, the second thermal insulation round brick and the crucible support are all provided with a nesting portion at one end close to the bottom plate; the bottom plate, the first thermal insulation round brick and the second thermal insulation round brick are provided with a groove at one end away from the bottom plate; the nesting portion and the groove match each other to form a nesting structure; the thickness of the first thermal insulation layer is 6 mm; the thickness of the second thermal insulation layer is 11 mm.

[0021] Beneficial effect: The utility model provides a furnace bottom structure for an infrared optical glass melting furnace, comprising: a support plate portion, comprising a bottom plate, a first insulating round brick arranged on the bottom plate, a furnace bottom support plate sleeved on the first insulating round brick and in contact with the bottom plate, and a first insulating layer arranged between the first insulating round brick and the bottom plate; a crucible fixing portion, comprising a second insulating round brick nested in the first insulating round brick on the side away from the bottom plate, a crucible support nested in the second insulating round brick on the side away from the bottom plate, and a crucible claw group arranged on the side of the crucible support away from the bottom plate; an eccentric opening, the eccentric opening passes through the crucible fixing portion and the support plate portion and is arranged away from the center line of the furnace bottom structure. The utility model utilizes a supporting plate portion and a crucible fixing portion to form a furnace bottom structure, and the structure cooperates with a lifting device of the melting furnace to achieve the effect of feeding and discharging materials at the furnace bottom; and by arranging an eccentric opening in the furnace bottom structure, a vertical furnace straight channel casting design is realized, so that the performance of the cast plastic solution is uniform and controllable, and no crystallization occurs, thereby improving the yield rate of the product; at the same time, the supporting structure of the crucible claw group is used to fix the melting crucible, which can effectively reduce the working space occupied by a rotating tipping device of a similar tipping type melting furnace, greatly expand the effective volume and working volume of the melting chamber, improve the single plastic melting quality, and improve the working efficiency; and effectively overcome the melting and casting problems generated by the tipping type and the diversion type melting furnace during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional structural schematic diagram of a furnace bottom structure for an infrared optical glass melting furnace according to the utility model;

[0023] Figure 2 This is a top view of a furnace bottom structure for an infrared optical glass melting furnace according to the utility model;

[0024] Figure 3 For along Figure 2 Schematic cross-sectional view of EE in FIG.

[0025] Description of reference numerals: bottom plate 10, fixing hole 11, first heat-insulating round brick 20, furnace bottom supporting plate 30, first heat-insulating layer 40, second heat-insulating round brick 50, crucible support 60, crucible claw group 70, first crucible claw 71, second crucible claw 72, third crucible claw 73, supporting portion 701, fixing portion 702, eccentric opening 80, second heat-insulating layer 90;

[0026] a represents the distance from the center of the eccentric opening to the center line of the furnace bottom structure. DETAILED DESCRIPTION

[0027] The utility model provides a furnace bottom structure for an infrared optical glass melting furnace. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0028] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0029] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the utility model belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as the meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0030] like Figure 1-2 As shown, the utility model provides a furnace bottom structure for an infrared optical glass melting furnace, comprising:

[0031] The support plate part includes a bottom plate 10, a first heat-insulating round brick 20 disposed on the bottom plate 10, a furnace bottom support plate 30 sleeved on the first heat-insulating round brick 20 and in contact with the bottom plate 10, and a first heat-insulating layer 40 disposed between the first heat-insulating round brick 20 and the bottom plate 10;

[0032] The crucible fixing part includes a second insulating round brick 50 nested in the first insulating round brick 20 away from the bottom plate 10, a crucible holder 60 nested in the second insulating round brick 50 away from the bottom plate 10, and a crucible claw group 70 arranged on the side of the crucible holder 60 away from the bottom plate 10;

[0033] An eccentric opening 80 passes through the crucible fixing portion and the supporting plate portion and is disposed offset from the center line of the furnace bottom structure.

[0034] In this embodiment, the furnace bottom structure is used in a fluorogallate infrared optical glass melting furnace to solve the design defects of pouring or diversion casting. The eccentric opening 80 is used to cooperate with the crucible with a discharge port at the bottom fixed on the crucible claw group 70, and the material can be discharged directly from the eccentric opening 80, thereby avoiding crystallization and cracking during the pouring of the molten glass, thereby improving the product yield. At the same time, the crucible is clamped and fixed by the crucible claw group 70, so that the melting crucible with a larger solvent can be supported more stably.

[0035] Specifically, after the bottom plate 10 is fixed to the lifting device outside the melting furnace, the lifting device is used to control the movement of the bottom plate 10, and a melting furnace with an opening at the bottom is provided. The bottom of the melting furnace can be sealed by the furnace bottom structure, so as to melt the clinker in the crucible fixed on the crucible fixing part. When the melting process is completed, the furnace bottom structure can be opened by the lifting device and transferred to the casting position. The eccentric opening is used as the discharge port to complete the casting process, which solves the problems of cracking and crystallization in the traditional casting method and improves the product yield. At the same time, the furnace bottom structure can achieve the vertical furnace straight channel casting effect of the infrared optical glass melting furnace, and the performance of the cast clinker melt is uniform and controllable; and the use of the crucible claw group 70 to fix the melting crucible can effectively reduce the working volume occupied by the rotating dumping device of the similar dumping type melting furnace. The effective volume and working volume of the melting chamber are greatly expanded, the quality of single clinker melting is improved, and the work efficiency is improved.

[0036] In some embodiments, the lifting device can be used to realize the spatial movement of the furnace bottom structure in the XYZ coordinate system, that is, the movement of the furnace bottom structure in the vertical direction can be realized, and the movement of the furnace bottom device in the horizontal direction can also be realized, so that the furnace bottom structure and the melting chamber can be opened and closed as the lifting device rises and falls.

[0037] In some embodiments, the distance from the center of the eccentric opening 80 to the center line of the furnace bottom structure is 34-40 mm. Figure 3 As shown in a in the figure; an eccentric opening is set at 34-40mm away from the center line of the furnace bottom structure, so that the glass melt can flow evenly and stably during the pouring process, so that the density and temperature are kept uniform and the same during pouring, and the uneven pouring and crystallization of the poured glass caused by the vortex generated by the Coriolis force, which causes the density and temperature of the melt that flows out first to decrease from high and then increase, is destroyed, bubbles and impurities are eliminated, and the quality of glass products is improved.

[0038] In a preferred embodiment, the distance between the center of the eccentric opening 80 and the center line of the furnace bottom structure is 36 mm, which can make the glass melt flow more uniformly and stably during the pouring process, so that the density and temperature remain uniform and the same during pouring.

[0039] In some embodiments, the eccentric opening is circular; the diameter of the eccentric opening is 85-95 mm. By controlling the diameter of the eccentric opening to be between 85-95 mm, the discharge speed of the molten glass can be moderate, which is convenient for pouring the molten glass.

[0040] In a preferred embodiment, the diameter of the eccentric opening is 90 mm.

[0041] In some embodiments, the crucible claw group 70 includes a plurality of first crucible claws 71, a plurality of second crucible claws 72, and a plurality of third crucible claws 73; the length of the first crucible claw 71 is greater than the length of the second crucible claw 72, and the length of the second crucible claw 72 is greater than the length of the third crucible claw 73; the melting crucible is fixed by using the crucible claws of different lengths on the crucible support 60, so that the fixing effect of the crucible can be ensured.

[0042] In some embodiments, the first crucible claw 71 , the second crucible claw 72 , and the third crucible claw 73 are equidistantly disposed on a side of the crucible holder away from the bottom plate.

[0043] Specifically, the total number of the first crucible claws 71, the second crucible claws 72 and the third crucible claws 73 is divided by 360° to obtain the spacing between each crucible claw, and the spacing between each crucible claw is ensured to be equal, so as to improve the stability of the melting crucible.

[0044] In some embodiments, the crucible claw group 70 includes three first crucible claws 71, two second crucible claws 72 and one third crucible claw 73; the three first crucible claws 71 are arranged on the side of the eccentric opening 80 close to the center line of the furnace bottom structure, the third crucible claw 73 is arranged on the side of the eccentric opening 80 away from the center line of the furnace bottom structure, and the two second crucible claws 72 are respectively arranged between the first crucible claws 71 and the third crucible claws 73.

[0045] Specifically, the crucible claws are evenly distributed at intervals of 60° on the side of the crucible holder away from the bottom plate, and because the furnace bottom structure is provided with an eccentric opening, a first crucible claw 71 is provided at the end of the crucible holder 60 away from the eccentric opening. The first crucible claw 71 has a relatively long length and can cooperate with the third crucible claw and the second crucible claw provided on the side close to the eccentric opening to form a better fixing structure, so that the melting crucible can be stably fixed on the crucible holder.

[0046] In some embodiments, the length of the first crucible claw is 100-110 mm; the length of the second crucible claw is 65-75 mm; the length of the third crucible claw is 45-55 mm, which needs to be appropriately adjusted according to the position of the eccentric opening.

[0047] In a preferred embodiment, the length of the first crucible claw is 105 mm; the length of the second crucible claw is 70 mm; and the length of the third crucible claw is 50 mm.

[0048] In some embodiments, a second heat insulating layer 90 is provided on the side of the furnace bottom supporting plate 30 facing away from the bottom plate 10, and the second heat insulating layer 90 is also attached to the periphery of the first heat insulating round brick 20. During the use of the furnace bottom structure, under the support of the furnace bottom supporting plate 30, the second heat insulating layer 90 is in contact and sealed with the edge of the furnace bottom of the melting furnace, and the outer side of the first heat insulating round brick 20 and the second heat insulating layer 90 effectively block the contact between the melting chamber and the outside. At the same time, because the furnace bottom covering material of the melting furnace is made of stainless steel, which has good thermal conductivity, its temperature is relatively low, and the structural temperature of 1050°C can effectively achieve its design purpose.

[0049] In a preferred embodiment, the material of the first thermal insulation layer 40 and the second thermal insulation layer 90 is 1050°C aluminosilicate fiber felt; the thickness of the first thermal insulation layer is 6 mm; the thickness of the second thermal insulation layer is 11 mm; the aluminosilicate fiber felt with a thickness of 6 mm made from 1050°C aluminosilicate fiber felt as the first thermal insulation layer can have a good thermal insulation effect; and the aluminosilicate fiber felt with a thickness of 11 mm as the second thermal insulation layer can not only have a thermal insulation effect, but also has a sealing effect.

[0050] In some embodiments, a plurality of loading positions are provided on a side of the crucible support away from the bottom plate, and the loading positions are used to load the crucible claw group; the horizontal height of the loading positions away from the centerline of the furnace bottom structure is higher than the horizontal height of the loading positions close to the centerline of the furnace bottom structure, thus forming an inclined slope design.

[0051] Specifically, the crucible support does not include the nesting part, has a thickness of 105 mm at the highest point and 90 mm at the lowest point, and can be loaded with crucible claws of different sizes to limit and fix the melting crucible.

[0052] In some embodiments, the first insulating round brick 20, the second insulating round brick 50 and the crucible holder 60 are each provided with a nesting portion at one end close to the bottom plate 10, and the bottom plate 10, the first insulating round brick 20 and the second insulating round brick 50 are each provided with a groove at one end away from the bottom plate, and the nesting portion and the groove match each other to form a nesting structure.

[0053] Specifically, a nested structure similar to building blocks is adopted, and the thickness of the nested part is 15 mm, and the depth of the groove is 15 mm. The nested structure can be used to limit the various components during on-site assembly, which ensures that the support stability is maintained in a high temperature environment, and avoids the crucible from sliding due to thermal expansion and contraction, which may cause the stirring blades in the crucible to collide with the inner wall of the crucible and cause adhesion, resulting in equipment damage and causing production safety accidents.

[0054] In some embodiments, the bottom plate 10 is made of stainless steel, which can limit the first insulating round brick 20 and support the crucible fixing part. The bottom plate 10 is provided with a plurality of fixing holes 11, through which the bottom plate 10 can be connected to the lifting device outside the melting furnace.

[0055] In some embodiments, the material of the first insulating round brick is first-grade high aluminum; the first insulating round brick includes a main body and a protrusion extending from the main body toward the bottom plate; the thickness of the main body is 80 mm, and the thickness of the protrusion is 25 mm; the protrusion can be used to improve the thermal insulation capacity of the discharge port and reduce the temperature drop of the molten liquid during the casting process.

[0056] In some embodiments, the second insulating round brick is made of alumina hollow balls, and the crucible holder is made of alumina, which has the same thermal expansion coefficient as the second insulating round brick, and will not cause fixation failure or sliding at an operating temperature of 1400°C; and the second insulating round brick can effectively perform the functions of support, fixation and insulation.

[0057] In some embodiments, the first crucible claw 71, the second crucible claw 72 and the third crucible claw 73 all include a supporting portion 701 and a fixing portion 702, the distance between the side of the supporting portion 701 facing away from the crucible support 60 and the side of the crucible support facing away from the bottom plate is 40 mm, and the distance between the side of the fixing portion 702 facing away from the crucible support 60 and the side of the crucible support facing away from the bottom plate is 52 mm; the supporting portion 701 and the fixing portion 702 are used to form a bayonet bracket during operation to fix the crucible.

[0058] Specifically, in order to better understand the workflow of the furnace bottom structure, the following is explained in combination with actual production operations, as follows:

[0059] 1. During the on-site assembly process, align the crucible support, the first insulating round brick, and the second insulating round brick with the reserved channel of the eccentric opening of the discharge port, and nest and fix them. After nesting, insert the 6mm thick aluminosilicate fiber felt into the first insulating round brick, and adjust the insertion angle so that the overall center of the circular fiber felt remains on the center line of the overall structure. Put the above structure into the furnace bottom support plate, keep the center line position, and place the 11mm thick aluminosilicate fiber felt on the wall of the furnace bottom support plate. After the above parts are installed, fix the whole to the bottom plate and the fixed position, and connect it to the auxiliary lifting structure of the fluorogallate infrared optical glass melting furnace. Load the crucible, fix it well, close the melting chamber by raising the furnace bottom structure, and after it is completely closed, close the discharge port to complete the installation.

[0060] 2. During the pouring process, after the discharge port is opened, the external lifting device makes the furnace bottom structure drop about 1.3m along the z-axis, completely open the melting chamber, open the bottom discharge port for heating, use a spray gun to heat the head material at the discharge port, collect the head material after it softens and flows, and push the template for pouring after the head material flows out. The outflowing molten liquid is in a stable laminar state, the solution composition is almost uniform, and the temperature distribution remains basically the same.

[0061] 3. After the melting work is completed and the furnace is shut down for equipment maintenance, the furnace bottom structure is opened and waited for natural cooling. After the furnace temperature is naturally cooled from the working temperature in the drying room to close to room temperature, the platinum crucible is removed using a platinum clamp, and the furnace bottom structure is separated from the fixed position and removed. The furnace bottom structure is disassembled, including the crucible claw, the crucible support, the first and second insulating round bricks, and the aluminosilicate fiber felt. After disassembly, maintenance is performed. The above process will be repeated for re-production.

[0062] In summary, the utility model provides a furnace bottom structure for an infrared optical glass melting furnace, comprising: a support plate portion, comprising a bottom plate, a first insulating round brick arranged on the bottom plate, a furnace bottom support plate sleeved on the first insulating round brick and in contact with the bottom plate, and a first insulating layer arranged between the first insulating round brick and the bottom plate; a crucible fixing portion, comprising a second insulating round brick nested in the first insulating round brick on the side away from the bottom plate, a crucible support nested in the second insulating round brick on the side away from the bottom plate, and a crucible claw group arranged on the side of the crucible support away from the bottom plate; an eccentric opening, the eccentric opening passes through the crucible fixing portion and the support plate portion and is arranged away from the center line of the furnace bottom structure. The utility model utilizes a supporting plate portion and a crucible fixing portion to form a furnace bottom structure, and the structure cooperates with a lifting device of the melting furnace to achieve the effect of feeding and discharging materials at the furnace bottom; and by arranging an eccentric opening in the furnace bottom structure, a vertical furnace straight channel casting design is realized, so that the performance of the cast plastic solution is uniform and controllable, and no crystallization occurs, thereby improving the yield rate of the product; at the same time, the supporting structure of the crucible claw group is used to fix the melting crucible, which can effectively reduce the working space occupied by a rotating tipping device of a similar tipping type melting furnace, greatly expand the effective volume and working volume of the melting chamber, improve the single plastic melting quality, and improve the working efficiency; and effectively overcome the melting and casting problems generated by the tipping type and the diversion type melting furnace during operation.

[0063] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A furnace bottom structure for an infrared optical glass melting furnace, characterized in that: include: The support plate part comprises a bottom plate, a first heat-insulating round brick arranged on the bottom plate, a furnace bottom support plate sleeved on the first heat-insulating round brick and in contact with the bottom plate, and a first heat-insulating layer arranged between the first heat-insulating round brick and the bottom plate; The crucible fixing part includes a second heat-insulating round brick nested in the first heat-insulating round brick on the side away from the bottom plate, a crucible holder nested in the second heat-insulating round brick on the side away from the bottom plate, and a crucible claw group arranged on the side of the crucible holder away from the bottom plate; An eccentric opening is provided, wherein the eccentric opening penetrates the crucible fixing portion and the supporting plate portion and is arranged deviating from the center line of the furnace bottom structure.

2. The furnace bottom structure for an infrared optical glass melting furnace according to claim 1, characterized in that: The distance from the center of the eccentric opening to the center line of the furnace bottom structure is 34-40 mm.

3. The furnace bottom structure for an infrared optical glass melting furnace according to claim 1, characterized in that: The eccentric opening is circular; the diameter of the eccentric opening is 85-95 mm.

4. The furnace bottom structure for an infrared optical glass melting furnace according to claim 1, characterized in that: The crucible claw group includes a plurality of first crucible claws, a plurality of second crucible claws, and a plurality of third crucible claws; the length of the first crucible claw is greater than the length of the second crucible claw, and the length of the second crucible claw is greater than the length of the third crucible claw.

5. The furnace bottom structure for an infrared optical glass melting furnace according to claim 4, characterized in that: The first crucible claw, the second crucible claw and the third crucible claw are equidistantly arranged on a side of the crucible holder away from the bottom plate.

6. The furnace bottom structure for an infrared optical glass melting furnace according to claim 4, characterized in that: The crucible claw group includes three first crucible claws, two second crucible claws and one third crucible claw; the three first crucible claws are arranged on a side of the eccentric opening close to the center line of the furnace bottom structure, the third crucible claw is arranged on a side of the eccentric opening away from the center line of the furnace bottom structure, and the two second crucible claws are respectively arranged between the first crucible claws and the third crucible claws.

7. The furnace bottom structure for an infrared optical glass melting furnace according to claim 4, characterized in that: The length of the first crucible claw is 100-110 mm; the length of the second crucible claw is 65-75 mm; and the length of the third crucible claw is 45-55 mm.

8. The furnace bottom structure for an infrared optical glass melting furnace according to claim 1, characterized in that: A second heat insulation layer is arranged on the side of the furnace bottom supporting plate facing away from the bottom plate, and the second heat insulation layer is also attached to the periphery of the first heat insulation round brick.

9. The furnace bottom structure for an infrared optical glass melting furnace according to claim 1, characterized in that: A plurality of loading positions are arranged on the side of the crucible support away from the bottom plate, and the loading positions are used to load the crucible claw group; the horizontal height of the loading position away from the center line of the furnace bottom structure is higher than the horizontal height close to the center line of the furnace bottom structure.

10. The furnace bottom structure for an infrared optical glass melting furnace according to claim 8, characterized in that: The first insulating round brick, the second insulating round brick and the crucible support are all provided with a nesting portion at one end close to the bottom plate, and the bottom plate, the first insulating round brick and the second insulating round brick are provided with a groove at one end away from the bottom plate, and the nesting portion and the groove match each other to form a nesting structure; the thickness of the first insulating layer is 6 mm; the thickness of the second insulating layer is 11 mm.

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