Laboratory-scale glass melting electric melting furnace device

Abstract

The utility model relates to the technical field of glass electric melting furnaces, and provides a laboratory scale glass melting electric melting furnace device which comprises a fixing frame, an outer furnace, a crucible, a telescopic cylinder and an electrode, the outer furnace comprises a furnace body, a furnace cover and a bottom furnace, and the furnace body is fixedly arranged on the fixing frame; the furnace cover is detachably fixed on the top side of the furnace body; the bottom furnace is detachably fixed on the bottom side of the furnace body; the crucible is fixedly arranged on the bottom furnace and is positioned in the furnace body; the two ends of the telescopic cylinder are fixedly connected with the fixing frame and the bottom furnace respectively, when the telescopic cylinder is shortened, the bottom furnace is separated from the furnace body, and the crucible is located outside the furnace body. According to the electric melting furnace, an external heating element is fixed in the furnace, the starting safety and convenience of the electric melting furnace are improved, the outer furnace is arranged to be of a split structure, the crucible can be moved to the outside of the furnace body, and therefore the crucible can be replaced conveniently, and the use efficiency of the electric melting furnace is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of glass melting by electric furnace, in particular to a laboratory-scale glass melting electric furnace device. Background Technique

[0002] The technical principle of glass electric melting is to generate Joule heat through electrodes immersed in the glass liquid to melt the glass batch. Compared with the traditional fuel-type glass melting furnace, the electric furnace has great advantages in energy conservation and environmental protection, and is widely recognized for its stable melting quality, strong process operability, low input cost and other advantages. The prerequisite for the electric furnace to generate Joule heat is that the substance between the electrodes needs to have a certain conductivity. When the electric furnace is started, the glass batch cannot conduct electricity to generate Joule heat. In the actual industrial application process of the electric furnace, generally, an external heat source is used to melt the solid glass batch in the furnace, and after removing the heat source, the electrodes are put in and the operation starts.

[0003] This starting method is suitable for industrial-grade electric furnaces with long operation cycles and stable batch formulas. When developing special glasses for different purposes, it is often necessary to carry out research on melting kilograms of glass with different formulas in the laboratory. However, due to factors such as laboratory space, personnel and safety, there are certain difficulties in the traditional external heat source starting method. In addition, since different glass formulas are often developed in the laboratory, if the residual glass in the refractory material in the furnace cannot be effectively removed, it will contaminate the final glass product and cause the test to fail.

[0004] Based on the above background, this patent provides a laboratory-scale kilogram-level glass melting electric furnace device, which can solve the problems of difficult starting and complex charging process of small-scale glass electric furnaces at the same time, and can meet the melting test requirements of various-purpose oxide glasses. Content of the Utility Model

[0005] In view of this, the utility model proposes a laboratory-scale glass melting electric furnace device, which fixes the external heating element in the furnace, avoiding high-temperature operations during the starting process. At the same time, a telescopic cylinder is designed to facilitate the replacement of the crucible in the furnace, carry out melting tests of different glass formulas, and improve the safety of operation and the convenience of use of the laboratory-scale electric furnace.

[0006] The technical solution of the utility model is realized as follows: The utility model provides a laboratory-scale glass melting electric furnace device, including a fixing frame, an outer furnace, a crucible, a telescopic cylinder and electrodes, wherein,

[0007] The outer furnace includes a furnace body, a furnace cover and a bottom furnace, wherein, the furnace body is fixedly arranged on the fixing frame; the furnace cover is detachably fixed on the top side of the furnace body; the bottom furnace is detachably fixed on the bottom side of the furnace body;

[0008] The crucible is fixedly arranged on the bottom furnace and is located inside the furnace body;

[0009] Both ends of the telescopic cylinder are fixedly connected to the fixed frame and the bottom furnace respectively. When the telescopic cylinder extends, the bottom furnace abuts against the furnace body. When the telescopic cylinder contracts, the bottom furnace is separated from the furnace body, and the crucible is located outside the furnace body, so that the crucible can be replaced at any time;

[0010] The electrode is fixedly penetrated on the crucible.

[0011] On the basis of the above technical solutions, preferably, the fixed frame includes a bottom frame and two positioning rods. The positioning rods and the furnace body are both fixedly arranged on the bottom frame, and the two positioning rods are arranged at intervals in a vertical arrangement;

[0012] The outer furnace further includes a limiting rod. The limiting rod is fixedly arranged on the bottom furnace and is detachably fixedly connected to the positioning rod located above or abuts against the top side of the positioning rod located below.

[0013] On the basis of the above technical solutions, preferably, the crucible includes a base, a crucible body and a discharge pipe. Among them,

[0014] A blanking port is formed in the bottom furnace. The base is fixedly arranged in the blanking port, and a material leakage port is formed inside it;

[0015] The crucible body is fixedly arranged above the base;

[0016] The discharge pipe is fixedly penetrated on the bottom side of the crucible body and is located in the material leakage port.

[0017] More preferably, the blanking port includes a fixed part and a material passing part. Among them,

[0018] The fixed part is formed on the top side of the bottom furnace, and it is a conical structure with a wider bottom and a narrower top. The base is fixedly arranged in the fixed part, and the base is a conical structure with a wider bottom and a narrower top;

[0019] The material passing part is formed on the bottom side of the bottom furnace and is communicated with the fixed part, and the inner diameter of the material passing part is smaller than the outer diameter of the lower end of the base.

[0020] More preferably, the material leakage port is a conical structure with a wider bottom and a narrower top. The inner diameter of the material leakage port is smaller than the inner diameter of the material passing part, and the material leakage port is coaxially arranged with the material passing part.

[0021] On the basis of the above technical solutions, preferably, the furnace body includes a furnace frame and a bottom frame. The furnace frame is fixedly arranged on the fixed frame; the bottom frame is fixedly arranged on the bottom side of the furnace frame and is coaxially arranged with it, and the inner diameter of the bottom frame is smaller than the inner diameter of the furnace frame;

[0022] The outer furnace further includes a heat-insulating lining, which is fixedly arranged on the top side of the bottom frame and abuts against the inner wall of the furnace frame;

[0023] The bottom furnace includes a furnace support and a sealing projection. The furnace support is fixedly connected to one end of the telescopic cylinder and abuts against the bottom side of the bottom frame; the sealing projection is fixedly arranged on the furnace support and abuts against the inner wall of the bottom frame and the bottom side of the heat-insulating lining.

[0024] Based on the above technical solutions, preferably, it further includes a cooling pipe, which is fixedly penetrated on the furnace body and abuts against the end of the electrode outside the crucible.

[0025] More preferably, it further includes silicon carbide rods, which are fixedly penetrated on the furnace body and are located outside the crucible.

[0026] More preferably, a plurality of silicon carbide rods are provided, and the plurality of silicon carbide rods are arranged in a well shape when viewed from above.

[0027] Based on the above technical solutions, preferably, it further includes a feeding pipe and a thermocouple. The feeding pipe and the thermocouple are both fixedly penetrated on the furnace cover. An inlet is opened on the upper side of the crucible, and the lower ends of the feeding pipe and the thermocouple are both located in the inlet.

[0028] A laboratory-scale glass melting electric furnace device of the present invention has the following beneficial effects compared with the prior art:

[0029] (1) By configuring fixed heating elements, the safety of furnace startup is improved, and the problem of difficult furnace startup operation is overcome.

[0030] (2) By setting the outer furnace as a split structure, the crucible can be moved to the outside of the furnace body by using the contraction of the telescopic cylinder, so as to facilitate the replacement of the crucible and is suitable for the melting of various glass varieties;

[0031] (3) By setting a conical base, the fixing firmness between the base and the bottom furnace can be improved. By setting a conical material discharge port, the discharge space of the material can be increased, and the material can be prevented from adhering to the side wall inside the bottom furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 The front view of a laboratory-scale glass melting electric furnace device of the present utility model in a state where the bottom furnace is connected to the furnace body;

[0034] Figure 2 The front view of a laboratory-scale glass melting electric furnace device of the present utility model in a state where the bottom furnace is separated from the furnace body;

[0035] Figure 3 The cross-sectional view of the outer furnace of a laboratory-scale glass melting electric furnace device of the present utility model;

[0036] Figure 4 The three-dimensional view of the furnace body of a laboratory-scale glass melting electric furnace device of the present utility model;

[0037] Figure 5 The cross-sectional view of the bottom furnace of a laboratory-scale glass melting electric furnace device of the present utility model.

[0038] Wherein: 1. Fixed frame; 11. Bottom frame; 12. Positioning rod; 2. Outer furnace; 21. Furnace body; 211. Furnace frame; 212. Bottom frame; 22. Furnace cover; 23. Bottom furnace; 231. Furnace support; 232. Sealing protrusion; 24. Limiting rod; 25. Heat preservation lining; 201. Feeding port; 2011. Fixed part; 2012. Material passing part; 3. Crucible; 31. Base; 32. Crucible body; 33. Discharge pipe; 301. Leakage port; 302. Feeding port; 4. Telescopic cylinder; 5. Electrode; 6. Cooling pipe; 7. Silicon carbide rod; 8. Feeding pipe; 9. Thermocouple. Specific embodiments

[0039] Next, in combination with the specific embodiments of the present utility model, the technical solutions in the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0040] As Figures 1-5 shown, a laboratory-scale glass melting electric furnace device of the present utility model includes a fixed frame 1, an outer furnace 2, a crucible 3, a telescopic cylinder 4, an electrode 5, a cooling pipe 6, a silicon carbide rod 7, a feeding pipe 8, and a thermocouple 9.

[0041] Among them, the fixed frame 1 is used to carry other components.

[0042] The outer furnace 2 is used to insulate the crucible 3. The outer furnace 2 includes a furnace body 21, a furnace cover 22 and a bottom furnace 23, wherein the furnace body 21 is fixed on the fixed frame 1, which is a hollow vertical cylindrical structure; the furnace cover 22 is detachably fixed to the top side of the furnace body 21 to seal the top side of the furnace body 21; the bottom furnace 23 is detachably fixed to the bottom side of the furnace body 21 to seal the bottom side of the furnace body 21; the outer furnace 2 includes a furnace body 21, a furnace cover 22 and a bottom furnace 23, and adjacent components are detachably fixedly connected, so that the outer furnace 2 is designed as a split structure.

[0043] The crucible 3 is used to provide a place for high-temperature melting of glass. The crucible 3 is fixedly arranged on the bottom furnace 23 and is located inside the furnace body 21 .

[0044] The telescopic cylinder 4 is used to control the movement of the bottom furnace 23. The two ends of the telescopic cylinder 4 are fixedly connected to the fixed frame 1 and the bottom furnace 23 respectively, and are used to drive the bottom furnace 23 and the furnace body 21 to move closer or separate. When the telescopic cylinder 4 is extended, the bottom furnace 23 and the furnace body 21 are pressed against each other, so that the crucible 3 is located in the furnace body 21 for glass solidification and melting operations. When the telescopic cylinder 4 is shortened, the bottom furnace 23 is separated from the furnace body 21, and the crucible 3 is located outside the furnace body 21, thereby facilitating the replacement and maintenance of the crucible 3 and improving the utilization efficiency of the electric melting furnace. At the same time, during the glass melting operation, the crucible 3 is located in the furnace body 21, away from the ground. After the glass melting operation is completed, the crucible 3 is separated from the furnace body 21 and close to the ground by the contraction of the telescopic cylinder 4, so as to avoid the problem of inconvenience in taking materials due to the crucible 3 being too high.

[0045] like Figure 2 As shown, the fixing frame 1 includes a base frame 11 and two positioning rods 12. The positioning rods 12 and the furnace body 21 are fixedly arranged on the base frame 11, and the two positioning rods 12 are arranged at intervals in a vertical arrangement; the outer furnace 2 also includes a limiting rod 24, which is fixedly arranged on the bottom furnace 23. The limiting rod 24 is located between the two positioning rods 12 and moves between the two positioning rods 12 as the telescopic cylinder 4 is extended. When the telescopic cylinder 4 is extended and the bottom furnace 23 is connected to the furnace body 21, the limiting rod 24 is in contact with the upper furnace 23. The positioning rod 12 on the other side is detachably fixed and can be fixed by bolts. When the telescopic cylinder 4 is retracted and the crucible 3 is located outside the furnace body 21, the limit rod 24 is abutted against the top side of the positioning rod 12 located below. The two positioning rods 12 can not only limit the moving range of the limit rod 24, but also allow the limit rod 24 to be connected to the two positioning rods 12 respectively when the electric melting furnace is in operation or shut down for maintenance, thereby reducing the burden on the telescopic cylinder 4 and increasing the service life of the telescopic cylinder 4.

[0046] like Figure 3As shown, the crucible 3 includes a base 31, a crucible body 32, and a discharge pipe 33. Among them, a material discharge opening 201 is formed in the bottom furnace 23, and the material discharge opening 201 penetrates through the top side and the bottom side of the bottom furnace 23. The base 31 is fixedly arranged in the material discharge opening 201, and a material leakage opening 301 is formed inside it, that is, the material leakage opening 301 is communicated with the material discharge opening 201; the crucible body 32 is fixedly arranged above the base 31; the discharge pipe 33 is fixedly penetrated through the bottom side of the crucible body 32 and is located in the material leakage opening 301. A mechanism such as a valve for controlling the on-off inside it is arranged in the discharge pipe 33. By controlling the valve, the material in the crucible 3 can be discharged from the crucible 3 along the discharge pipe 33, the material leakage opening 301, and the material discharge opening 201. As Figure 2 shown, push the material cart to the lower part of the bottom furnace 23, and open the control valve to discharge the material in the crucible 3 onto the material cart for collection.

[0047] As Figure 5 shown, the material discharge opening 201 includes a fixed part 2011 and a material passing part 2012. Among them, the fixed part 2011 is formed in the top side of the bottom furnace 23, and it is a conical structure that is thicker at the bottom and narrower at the top. As Figure 3 shown, the base 31 is fixedly arranged in the fixed part 2011, and the base 31 is a conical structure that is thicker at the bottom and narrower at the top, so as to prevent the base 31 from being separated from the bottom furnace 23 when the bottom furnace 23 moves downward; the material passing part 2012 is formed in the bottom side of the bottom furnace 23 and is communicated with the fixed part 2011, and the inner diameter of the material passing part 2012 is smaller than the outer diameter of the lower end of the base 31, so as to prevent the base 31 from moving downward along the material passing part 2012, and improve the fixing firmness between the base 31 and the bottom furnace 23.

[0048] As Figure 3 shown, the material leakage opening 301 is a conical structure that is thicker at the bottom and narrower at the top, that is, a flared shape. The inner diameter of the material leakage opening 301 is smaller than the inner diameter of the material passing part 2012, and the material leakage opening 301 is coaxially arranged with the material passing part 2012, so as to prevent the material falling along the discharge pipe 33 from adhering to the inner wall of the material leakage opening 301 or the material passing part 2012, and ensure the cleanliness of this electric melting furnace.

[0049] As Figure 4 shown, the furnace body 21 includes a furnace frame 211 and a bottom frame 212. The furnace frame 211 is fixedly arranged on the fixing frame 1; the bottom frame 212 is fixedly arranged on the bottom side of the furnace frame 211 and is coaxially arranged with it. Both of them are vertical cylindrical structures, and the inner diameter of the bottom frame 212 is smaller than the inner diameter of the furnace frame 211; As Figure 3 shown, the outer furnace 2 further includes a heat preservation lining 25. The heat preservation lining 25 is fixedly arranged on the top side of the bottom frame 212 and is in contact with the inner wall of the furnace frame 211. It is also a vertical cylindrical structure. The heat preservation lining 25 can improve the overall heat insulation performance of the outer furnace 2. The bottom frame 212 can provide good support for the heat preservation lining 25 to prevent the heat preservation lining 25 from falling off when the bottom furnace 23 is separated from the furnace body 21; AsFigure 3 and Figure 5 As shown in Figure 5 , the bottom furnace 23 includes a furnace support 231 and a sealing protrusion 232. The furnace support 231 is fixedly connected to one end of the telescopic cylinder 4 and abuts against the bottom side of the bottom frame 212; the sealing protrusion 232 is fixedly arranged on the furnace support 231 and abuts against the inner wall of the bottom frame 212 and the bottom side of the heat preservation lining 25. The setting of the sealing protrusion 232 can increase the contact area between the bottom furnace 23 and the furnace body 21, improve the connection sealing performance between the two, and also play a role in improving the heat insulation performance of this electric melting furnace.

[0050] The electrode 5 is used to heat the materials inside the crucible 3. The electrode 5 is fixedly penetrated on the crucible 3. After the electrode 5 is electrified outside the crucible 3, the glass in the crucible 3 can be melted.

[0051] The cooling pipe 6 is used to cool the electrode 5 to prevent it from being damaged due to excessive local temperature rise. The cooling pipe 6 is fixedly penetrated on the furnace body 21 and abuts against one end of the electrode 5 outside the crucible 3. A flowing cooling medium is introduced into the cooling pipe 6 to utilize its abutment against the electrode 5 to realize the heat exchange between the medium heat and the electrode 5 heat, thereby realizing the heat dissipation effect of the electrode 5. This is the prior art; and because the cooling pipe 6 and the electrode 5 are in abutting connection, when the bottom furnace 23 moves downward, the electrode 5 can be slid away from the cooling pipe 6, and when the bottom furnace 23 moves upward, the electrode 5 can slide back to the position where it fits with the cooling pipe 6.

[0052] The silicon carbide rod 7 is used to heat the crucible 3. The silicon carbide rod 7 is fixedly penetrated on the furnace body 21 and is located outside the crucible 3 to increase the temperature inside the crucible 3 during the test and melt the solid glass batch. Then the electrode 5 can be put in to complete the start-up of the electric melting furnace. At the same time, the setting of the silicon carbide rod 7 can also be used for auxiliary heating to improve the glass melting efficiency. Of course, its heating can also dry the moisture in the outer furnace 2 before the experiment; the silicon carbide rod 7 can be heated by being electrified. This is the prior art.

[0053] As Figure 3 shown, a plurality of silicon carbide rods 7 are provided, and the plurality of silicon carbide rods 7 are arranged in a cross shape when viewed from above. The crucible 3 is located in the middle of the plurality of silicon carbide rods 7 arranged in a cross shape, thus ensuring the heating efficiency and stability of the silicon carbide rods 7 for the crucible 3.

[0054] The feeding pipe 8 is used to add materials into the crucible 3. As Figure 3 shown, the feeding pipe 8 is fixedly penetrated on the furnace cover 22. An inlet 302 is opened on the upper side of the crucible 3, and the lower end of the feeding pipe 8 is located in the inlet 302, so as to add materials into the crucible 3 from the outside of the electric melting furnace.

[0055] The thermocouple 9 is used to measure the temperature of the materials in the crucible 3. As Figure 3As shown, the thermocouple 9 is fixedly penetrated through the furnace cover 22, and the lower end of the thermocouple 9 is located inside the feed port 302 and can be directly inserted into the material in the crucible 3.

[0056] The usage method of a laboratory-scale glass melting electric furnace device of the present utility model is as follows:

[0057] As Figure 1 shown, first, the silicon carbide rod 7 is powered on to heat the interior of the outer furnace 2 and the crucible 3 to dry the moisture inside. When the thermocouple 9 detects that the temperature in the crucible 3 reaches the first specified temperature (the temperature at which the starting material needs to be added), the starting material (after the material melts, the liquid level can submerge the electrode 5) is added into the crucible 3 through the feeding pipe 8, and the silicon carbide rod 7 is powered off while the electrode 5 is powered on. At the same time, a cooling medium is introduced into the cooling pipe 6. When the thermocouple 9 detects that the temperature in the crucible 3 reaches the second specified temperature (the temperature at which the material needs to be added), glass raw materials are added into the crucible 3 through the feeding pipe 8. After the addition is completed, the power-on power of the electrode 5 is controlled to keep the temperature in the crucible 3 at about 1200 °C and keep it warm for 4 h. By controlling the on-off of the discharge pipe 33, the material in the crucible 3 is discharged into the material vehicle moved under the bottom furnace 23. After the whole furnace slowly cools down to room temperature, the telescopic cylinder 4 is contracted to lower the furnace bottom 23, and check whether the crucible 3 and the electrode 5 are damaged.

[0058] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A laboratory-scale glass melting electric furnace device, characterized in that: It includes a fixing frame (1), an outer furnace (2), a crucible (3), a telescopic cylinder (4) and an electrode (5). Among them, the outer furnace (2) includes a furnace body (21), a furnace cover (22) and a bottom furnace (23). Among them, the furnace body (21) is fixedly arranged on the fixing frame (1); the furnace cover (22) is detachably fixed on the top side of the furnace body (21); the bottom furnace (23) is detachably fixed on the bottom side of the furnace body (21); the crucible (3) is fixedly arranged on the bottom furnace (23) and is located inside the furnace body (21); both ends of the telescopic cylinder (4) are fixedly connected to the fixing frame (1) and the bottom furnace (23) respectively. When the telescopic cylinder (4) extends, the bottom furnace (23) abuts against the furnace body (21). When the telescopic cylinder (4) shortens, the bottom furnace (23) is separated from the furnace body (21), and the crucible (3) is located outside the furnace body (21); the electrode (5) is fixedly penetrated on the crucible (3).

2. The laboratory-scale glass melting electric furnace device according to claim 1, characterized in that: the fixing frame (1) includes a bottom frame (11) and two positioning rods (12). The positioning rods (12) and the furnace body (21) are both fixedly arranged on the bottom frame (11), and the two positioning rods (12) are arranged at intervals in a vertically arranged manner; the outer furnace (2) further includes a limiting rod (24). The limiting rod (24) is fixedly arranged on the bottom furnace (23) and is detachably fixedly connected to the positioning rod (12) above or abuts against the top side of the positioning rod (12) below.

3. A laboratory-scale glass melting electric furnace device according to claim 1, characterized in that: the crucible (3) includes a base (31), a crucible body (32) and a discharge pipe (33). Among them, a blanking port (201) is opened in the bottom furnace (23). The base (31) is fixedly arranged in the blanking port (201), and a material leakage port (301) is opened inside it; the crucible body (32) is fixedly arranged above the base (31); the discharge pipe (33) is fixedly penetrated on the bottom side of the crucible body (32) and is located inside the material leakage port (301).

4. The laboratory-scale glass melting electric furnace device according to claim 3, characterized in that: the blanking port (201) includes a fixing part (2011) and a material passing part (2012). Among them, the fixing part (2011) is opened on the top side of the bottom furnace (23). It is a conical structure that is wider at the bottom and narrower at the top. The base (31) is fixedly arranged in the fixing part (2011), and the base (31) is a conical structure that is wider at the bottom and narrower at the top; the material passing part (2012) is opened on the bottom side of the bottom furnace (23) and is communicated with the fixing part (2011), and the inner diameter of the material passing part (2012) is smaller than the outer diameter of the lower end of the base (31).

5. The laboratory-scale glass melting electric furnace device according to claim 4, characterized in that: the material leakage port (301) is a conical structure that is wider at the bottom and narrower at the top. The inner diameter of the material leakage port (301) is smaller than the inner diameter of the material passing part (2012), and the material leakage port (301) is coaxially arranged with the material passing part (2012).

6. A laboratory-scale glass melting electric furnace device according to claim 1, characterized in that: The furnace body (21) includes a furnace frame (211) and a bottom frame (212). The furnace frame (211) is fixedly arranged on the fixed frame (1); the bottom frame (212) is fixedly arranged on the bottom side of the furnace frame (211), is coaxially arranged with it, and the inner diameter of the bottom frame (212) is smaller than the inner diameter of the furnace frame (211). The outer furnace (2) further includes a heat-insulating inner lining (25). The heat-insulating inner lining (25) is fixedly arranged on the top side of the bottom frame (212) and abuts against the inner wall of the furnace frame (211). The bottom furnace (23) includes a furnace support (231) and a sealing protrusion (232). The furnace support (231) is fixedly connected to one end of the telescopic cylinder (4) and abuts against the bottom side of the bottom frame (212); the sealing protrusion (232) is fixedly arranged on the furnace support (231) and abuts against the inner wall of the bottom frame (212) and the bottom side of the heat-insulating inner lining (25).

7. A laboratory-scale glass melting electric furnace device according to claim 1, characterized in that: It further includes a cooling pipe (6). The cooling pipe (6) is fixedly arranged through the furnace body (21) and abuts against the end of the electrode (5) outside the crucible (3).

8. A laboratory-scale glass melting electric furnace device according to claim 7, characterized in that: It further includes a silicon carbide rod (7). The silicon carbide rod (7) is fixedly arranged through the furnace body (21) and is located outside the crucible (3).

9. The laboratory-scale glass melting electric furnace device according to claim 8, characterized in that: A plurality of the silicon carbide rods (7) are provided, and the plurality of silicon carbide rods (7) are arranged in a cross shape when viewed from above.

10. The laboratory-scale glass melting electric furnace device according to claim 1, characterized in that: It further includes a feeding pipe (8) and a thermocouple (9). The feeding pipe (8) and the thermocouple (9) are both fixedly arranged through the furnace cover (22). An inlet (302) is provided on the upper side of the crucible (3), and the lower ends of the feeding pipe (8) and the thermocouple (9) are both located in the inlet (302).

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