All-electric melting furnace for producing brown soda-lime glass tube

Abstract

The invention discloses an all-electric melting furnace for producing brown soda-lime glass tubes, and belongs to the field of glass kilns. An electrode is upwards inserted into a furnace body from a heat insulation mounting part fixed on the outer side of the bottom of the furnace body, a closed ring sleeve is vertically mounted in a shaft hole of the heat insulation mounting part, and a vertical runner hole which is communicated with the shaft hole and is close to the side wall of the electrode is formed above the shaft hole; a gate plate is horizontally arranged on one side of the vertical runner hole in a sliding manner; a cooling system is arranged on the outer side of the shaft hole; the controller can control the top of the electrode to be exposed out of the inner bottom of the furnace body when the electrode is inserted into the furnace body upwards at the initial moment, and molten glass can flow into the annular gap through the vertical runner hole at the initial electrifying stage of the electrode; the liquid level of the molten glass gathered above the closed ring sleeve is a certain distance away from the bottom port of the vertical drainage channel, and at the moment, the controller starts a cooling system in the cooling cavity to cool the molten glass in the annular gap. The method can greatly improve the yield of the brown soda-lime glass liquid.

Description

Technical Field

[0001] The invention relates to the field of glass furnaces, and in particular to a full-electric furnace for producing brown soda-lime glass tubes. Background Art

[0002] Existing brown soda-lime glass tubes are produced through flame furnaces, while colorless glass is produced through all-electric melting furnaces. The production of brown soda-lime glass is more difficult because the glass itself conducts heat slowly, so it is more difficult to melt, resulting in a large number of defects in the glass and a significant reduction in the yield.

[0003] Existing all-electric melting furnaces mostly use the method of inserting electrodes in a circular side wall or the method of inserting electrodes at the bottom for uniform heat transfer. However, brown soda-lime glass has a slow heat transfer rate. To improve the glass liquid harvesting efficiency, it is necessary to increase the power adjustment of the electrodes. However, this rough power adjustment method is likely to result in large power consumption losses and insufficient energy saving. Moreover, the installation method of inserting electrodes at the bottom makes it difficult to change the installation depth of the electrodes. It is difficult to balance energy consumption and glass liquid harvesting rate by simply relying on changing the power to control thermal efficiency. Therefore, it is urgent to improve the existing all-electric glass melting furnaces. Summary of the Invention

[0004] The present invention is aimed at the defects of the prior art mentioned in the above background technology, and thus proposes a full-electric melting furnace for producing brown soda-lime glass tubes to solve the problems raised in the background technology.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] The present invention provides a fully electric melting furnace for producing brown soda-lime glass tubes, comprising a furnace body and electrodes installed in the furnace body. The electrodes are vertically installed at the bottom of the furnace body, and the electrodes are inserted upwards into the furnace body from a heat-insulating mounting portion fixed on the outside of the bottom of the furnace body. A sealed ring sleeve is vertically installed in an axial hole in the heat-insulating mounting portion for axially inserting the electrode. The sealed ring sleeve is initially located near the bottom of the axial hole. A plurality of vertical flow channel holes close to the side wall of the electrode are provided above the axial hole and in communication therewith, and a gate plate is provided on one side of the vertical flow channel hole for horizontal sliding.

[0007] An annular cooling chamber is coaxially provided on the outside of the axial hole, and a cooling system is provided in the cooling chamber; the electrode is driven by a hydraulic push rod to move axially, and the hydraulic push rod is controlled by a controller. The controller can control the electrode to be inserted upward into the furnace body at the initial moment, so that the top of the electrode is exposed to a certain length from the bottom of the furnace body. When the raw materials around the top of the electrode are melted into glass liquid after the electrode is energized, the glass liquid can flow into the annular gap between the electrode and the hole wall of the axial hole through the vertical flow channel hole. When the glass liquid accumulated above the closed ring sleeve reaches the set weight, the closed ring sleeve moves down to the bottom of the axial hole, and the liquid level of the glass liquid accumulated above the closed ring sleeve is still a distance from the bottom port of the vertical drainage channel, and the gate plate is inserted into the vertical flow channel hole to close it. At this time, the controller starts the cooling system in the cooling chamber to cool the glass liquid in the annular gap, so that the glass liquid is cooled and solidified and filled in the annular gap.

[0008] Furthermore, the bottom of the furnace body where the electrode penetrates is a shallow concave surface, and a plurality of the vertical drainage channels are arranged around the shallow concave surface.

[0009] Furthermore, the cross section of the upper portion of the sealed ring sleeve is rectangular, and the cross section of the lower portion is an isosceles trapezoid with a bottom side shorter than a top side. The bottom of the shaft hole can be socket-fitted with the lower portion of the sealed ring sleeve.

[0010] Furthermore, the sealed ring sleeve is a hollow structure with uniform wall thickness, and the electrode coaxially passes through the upper portion of the sealed ring sleeve.

[0011] Furthermore, the bottom end of the closed ring sleeve is connected to a Z-shaped curved arm, the upper part of the curved arm vertically slides through the bottom of the shaft hole, and a pressing component is provided at the lower part of the curved arm. The pressing component supports the curved arm so that the closed ring sleeve is in an initial position, and the pressing component controls the hydraulic telescopic rod to push the gate plate to move horizontally; a limiting ring is integrally provided on the side wall of the shaft hole, and the inner side wall of the limiting ring is a conical surface with the small end facing downward, and the top end of the closed ring sleeve is in the initial position when in contact with the limiting ring.

[0012] Furthermore, the pressing component includes a mounting seat hole arranged in the center of the top, and a cylindrical spring vertically installed on the opening of the mounting seat hole. A pressure plate is coaxially placed on the top of the cylindrical spring, and the pressure plate is coaxially fixed to the conductor rod at the bottom end of the crank arm. When the closed ring sleeve slides to the bottom of the shaft hole, the conductor rod is inserted into the mounting seat hole and contacts the conductive sleeve embedded in the mounting seat hole, so that the hydraulic telescopic rod is extended.

[0013] Furthermore, a push plate perpendicular to the gate is fixed at the bottom thereof, the push plate being exposed from the bottom end of the heat-insulating mounting portion, and the hydraulic telescopic rod being connected to the push plate to push the push plate to move horizontally.

[0014] Furthermore, the condensation pipe of the cooling system spirally surrounds the outer side of the shaft hole, and the cooling cavity is filled with a heat exchange medium to take away the heat of the glass liquid in the shaft hole to achieve its condensation.

[0015] Furthermore, a first temperature sensing element is provided in the furnace body, and the first temperature sensing element is provided below the liquid level of the glass liquid formed after the raw materials in the furnace are fully melted, and a second temperature sensor element is provided at the bottom of the furnace body; when the temperature detected by the first temperature sensing element is higher than the glass melting temperature, and the temperature detected by the second temperature sensing element is within the temperature resistance range of the material at the bottom of the furnace body, the power controller of the electrode turns off the cooling system for a set time, pulls the electrode downward for a displacement, and then immediately turns on the cooling system.

[0016] Furthermore, when the liquid level in the furnace after the raw materials are put in and melted is h, the electrode is pulled down by h / 10 for every 50° C. that the temperature detected by the first temperature sensing element is higher than the glass melting temperature.

[0017] Compared to existing technologies in this field, this invention offers the following advantages: It utilizes a bottom-inserted electrode design and a special axially movable electrode mounting structure. This allows the raw materials in the furnace to be partially melted at the installation location, allowing the molten glass to flow into the annular gap between the electrode and the thermally insulated mounting portion. Because the molten glass is minimal and the pressure is low at this point, leakage is less likely. The cooling system is then activated to cover the electrode, securing and sealing the electrode with the solid glass produced within the annular gap. Furthermore, a special control mechanism for adjusting the electrode installation depth is employed, utilizing a power controller to automatically adjust the electrode insertion depth, taking into account both heat dissipation and maximum power consumption.

[0018] Finally, another key effect is that, based on the above design, the present invention takes the lead in considering the matching mechanism required for the influence of the electrode installation depth on the increase of electrode power consumption and the heat transfer range. On the basis of being able to flexibly adjust the electrode installation depth, the high-temperature area around the electrode is reasonably and fully increased, which can significantly increase the flow range of the glass liquid, greatly reduce the dead corners of the glass liquid flow in the melting furnace, enhance the fluidity of the glass liquid, and to a large extent make the temperature distribution in the furnace body more uniform again, so that the thermal energy of the glass liquid in the energized and heating state can be distributed more evenly, and better glass liquid can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the core technical solution of the present invention, a brief introduction will be given below to at least one embodiment based on the core concept of the present invention, supplemented by the structural principle diagrams required in the relevant prior art when necessary. Of course, the following drawings are only some feasible embodiments of the concept of the present invention. For those skilled in the art, without paying a lot of extra creative work, they can also expand some adaptive technical designs that may be represented by these drawings.

[0020] Figure 1 It is a partial cross-sectional view of the present invention;

[0021] Figure 2 yes Figure 1 A magnified view of the structure at position I in the middle;

[0022] Figure 3 yes Figure 2 A magnified view of the structure at II in the middle;

[0023] Figure 4 It is a cross-sectional view of the closed ring sleeve;

[0024] Figure 5 yes Figure 2 A magnified view of the structure at position III;

[0025] Figure 6 This is a schematic diagram of the location of the temperature sensing elements provided in the furnace body.

[0026] Explanation of the accompanying drawings: furnace body 1, electrode 2, thermal insulation mounting part 3, limiting ring 301, cooling chamber 4, condensation pipe 5, annular gap 6, closed ring sleeve 7, vertical drainage channel 8, gate 9, push plate 10, hydraulic telescopic rod 11, curved arm 12, pressing component 13, pressure plate 14, conductive rod 15, cylindrical spring 16, mounting seat hole 17, first temperature sensing element 18, second temperature sensing element 19. DETAILED DESCRIPTION

[0027] In order to make the purpose and effect of the creative features and technical means realized by the present invention more clearly understood, the relevant technical solutions of the present invention are discussed in detail here. It should be understood by those skilled in the art that the following embodiments are solutions, which are only some feasible or recommended implementation structures or methods of the present invention, and are not all embodiments embodied by the present invention.

[0028] Those skilled in the art refer to Figure 1-Figure 3As shown, this embodiment discloses an all-electric melting furnace for producing brown soda-lime glass tubes, which mainly includes a furnace body 1 and a plurality of electrodes 2 installed in the furnace body 1. The electrodes 2 are vertically installed at the bottom of the furnace body 1, that is, the electrodes 2 are inserted upward from the heat-insulating mounting portion 3 fixed on the outer side of the bottom of the furnace body 1 into the furnace body 1 for installation and fixation. Specifically, a sealed ring sleeve 7 is also vertically installed in the axial hole of the heat-insulating mounting portion 3 for axial insertion of the electrode 2. The sealed ring sleeve 7 is initially located near the bottom of the axial hole, that is, the initial position is at the upper part of the bottom of the axial hole. Above the axial hole, a plurality of vertical flow channel holes are provided near the side walls of the electrode 2 and connected thereto. A gate plate 9 is horizontally slidably provided on one side of the vertical flow channel hole. The gate plate 9 can be inserted into the vertical flow channel hole to block the internal passage.

[0029] At the same time, this embodiment also coaxially defines an annular cooling chamber 4 outside the axial hole. This cooling chamber 4 can be larger and includes a cooling system for rapidly cooling the area enclosed by the cooling chamber 4. During installation, the electrode 2 can be moved axially by a hydraulic push rod (not shown). The hydraulic push rod is controlled by a controller that ensures that, when the electrode 2 is initially inserted upward into the furnace body 1, the top of the electrode 2 protrudes from the bottom of the furnace body 1 by a certain length, for example, only 20 cm to 40 cm. After the electrode 2 is energized, the raw materials around the top of the electrode 2 melt first and then conduct electricity, so that when the raw materials in this area are completely melted into glass liquid, the glass liquid can flow directly into an annular gap 6 between the electrode 2 and the wall of the axial hole through the vertical flow channel hole. Moreover, when the glass liquid accumulated above the sealed ring sleeve 7 reaches the set weight, the sealing ring sleeve is squeezed down, so that the sealed ring sleeve 7 moves down to the bottom of the axial hole, and the liquid level of the glass liquid accumulated above the sealed ring sleeve 7 is still some distance away from the bottom port of the vertical drainage channel 8. The purpose is to obtain a solid glass body away from the vertical flow channel hole after subsequent cooling, so as to further insulate at the beginning of installing the electrode 2. In this embodiment, the hydraulic telescopic rod 11, described later, can be used to insert the gate 9 into the vertical channel hole to seal it, preventing the glass liquid from continuing to flow into the annular gap 6. Furthermore, the controller activates the cooling system in the cooling chamber 4, turning on the forced cooling mode to rapidly cool the glass liquid in the annular gap 6. This rapidly cools the glass liquid, allowing it to solidify and fill the annular gap 6, connecting it to the electrode 2 and the thermally insulating mounting portion 3. This prevents the glass liquid from continuously leaking from the furnace body 1 during the heating process. The condensation pipe 5 of the cooling system spirally surrounds the outer side of the axial hole, and the cooling chamber 4 is filled with a heat exchange medium to remove heat from the glass liquid in the axial hole and achieve condensation. To allow the initial glass liquid to flow quickly into the annular gap 6, the bottom of the furnace body 1 is designed as a shallow concave surface where the electrode 2 penetrates. Several vertical drainage channels 8 are provided around the shallow concave surface. The glass liquid that first melts in the shallow concave surface can be promptly poured into the annular gap 6 for subsequent cooling and fixation.

[0030] In practice, such as Figure 3-Figure 4 The upper cross-section of the sealed ring sleeve 7 is rectangular, while the lower cross-section is an isosceles trapezoid with the bottom side shorter than the top side. The bottom of the axial hole can be socket-fitted with the lower part of the sealed ring sleeve 7. During manufacturing, it is best to have the sealed ring sleeve 7 as a hollow structure with uniform wall thickness. The electrode 2 coaxially passes through the upper part of the sealed ring sleeve 7. This can not only ensure the good installation of the electrode 2, but also effectively achieve the sealing of the seam around the electrode 2.

[0031] In the above embodiment, the hydraulic telescopic rod 11 is designed to drive the gate plate 9. Figure 2 and Figure 5 , it can be that a Z-shaped crank arm 12 is connected to the bottom end of the closed ring sleeve 7, and the upper part of the crank arm 12 vertically slides through the bottom of the shaft hole, and a pressing component 13 is provided at the lower part of the crank arm 12. At the beginning, this pressing component 13 supports the crank arm 12 so that the closed ring sleeve 7 is in the initial position, and the pressing component 13 controls the hydraulic telescopic rod 11 to push the gate plate 9 to move horizontally, that is, when the pressing component 13 cooperates with the crank arm 12, the hydraulic telescopic rod 11 extends. In addition, in order to achieve the positioning of the closed ring sleeve 7, a limiting ring 301 is integrally provided on the side wall of the shaft hole. The inner side wall of the limiting ring 301 is a conical surface with the small end facing downward. When the top of the closed ring sleeve 7 contacts the limiting ring 301, it is exactly in the initial position.

[0032] Continue reading Figure 5 The pressing component 13 in this embodiment includes a mounting seat hole 17 set in the center of the top, and a cylindrical spring 16 vertically mounted on the opening of the mounting seat hole 17. A pressure plate 14 is coaxially placed on the top of the cylindrical spring 16. The pressure plate 14 is coaxially fixed to the conductor rod at the bottom end of the crank arm 12 as a whole. The conductor rod is used as a section of a wire. When the closed ring sleeve 7 slides to the bottom of the shaft hole, the conductor rod is inserted into the mounting seat hole 17 and contacts the conductive sleeve embedded in the mounting seat hole 17. This conductive sleeve is used as another section of the wire. Then the two wires are connected, that is, the conductor rod is inserted into the conductive sleeve, so that a control switch of the hydraulic telescopic rod 11 is energized, causing the hydraulic telescopic rod 11 to extend.

[0033] In the above embodiments, please refer to Figure 2 As shown, a push plate 10 perpendicular to the gate plate 9 is fixed at the bottom thereof, the push plate 10 is exposed at the bottom end of the heat insulation mounting portion 3, and a hydraulic telescopic rod 11 is connected to the push plate 10 to push the push plate 10 to move horizontally.

[0034] In addition, as a better design, Figure 6 As shown, a first temperature sensing element 18 can also be provided in the furnace body 1. The detection end of the first temperature sensing element 18 is provided below the liquid surface of the glass liquid formed after the raw materials in the furnace are fully melted. Correspondingly, a second temperature sensor element is provided at the bottom of the furnace body 1, which is used to detect the temperature of the glass liquid surface layer and the temperature of the bottom layer, respectively. Because, generally speaking, the ambient temperature at the top of the electrode 2 away from the glass liquid surface is higher, which easily causes heat to be lost outside the liquid surface, resulting in low heat utilization rate. If the power of the electrode 2 is simply increased to increase the range of the high-temperature zone formed around it, more heat will be lost. Therefore, in this embodiment, the temperature around the liquid surface must be detected so that the high-temperature zone of the electrode 2 can more appropriately consider the glass liquid surface, which can maintain the temperature of the top liquid surface without unnecessary overheating and causing a large amount of heat to be lost from the space above the liquid surface. When the electrode 2 is currently installed in a certain position, such as Figure 6When the height of the top of the electrode 2 is H2 from the liquid surface, the range of the high temperature area is Figure 6 If the temperature detected by the first temperature sensor element 18 is significantly higher than the glass melting temperature, it means that the electrode 2 has room to fall, that is, the top is far away from the glass liquid surface at this time, and it can be adjusted to Figure 6 As shown in the figure, at the height H1 from the liquid surface, since it is far away from the glass liquid surface, the glass liquid surface is still not lower than the glass melting temperature, so it does not affect the heating state of the glass liquid near the top layer, but the excess heat can form a larger high-temperature area, that is, Figure 6 The thin solid line in the circle shown in FIG significantly increases the flow range of the molten glass, greatly reducing dead angles in the melting furnace, improving thermal efficiency, and accelerating the heating process. Furthermore, the power of electrode 2 can be appropriately increased. As long as the detection value of the first temperature sensor element 18 exceeds the rated temperature range for glass melting, the power of electrode 2 can be further increased. However, the increase in the power of electrode 2 is not only subject to the temperature of the molten glass surface layer, but also the temperature resistance of the material at the bottom of the furnace body 1 must be considered. In the process of melting to obtain glass liquid, there is not only a simple flow of heat, that is, heat flows from high temperature to low temperature, but also the flow of glass liquid. Since the volume of glass liquid in the high temperature area must be larger than the volume in the low temperature area, it can overcome gravity, friction, etc., so that the higher temperature glass at the top moves downward, that is, flows towards the lower temperature area below the above-mentioned high temperature area, so that the lower lower temperature glass liquid flows upward towards the high temperature area of the upper higher temperature area, resulting in the temperature of the bottom of the furnace body 1 being further increased when the glass liquid in the high temperature area moves downward, which may cause the temperature of the bottom of the furnace body 1 to exceed the limit. Therefore, when increasing the power of the electrode 2, the temperature value of the furnace bottom must also be taken into account, and when the temperature detected by the second temperature sensor element 19 is about to exceed the temperature resistance range of the material at the bottom of the furnace body 1, the power cannot be increased any further, and if necessary, the power should be slightly reduced.

[0035] In the above embodiment, to achieve the axial movement of the fixed electrode 2 again, the cooling system needs to be shut down for a set time, and the glass originally cooled in the annular gap 6 is melted by the glass liquid falling from the vertical drainage channel 8. In this way, the fixed state of the electrode 2 can be released. After the electrode 2 is pulled downward for a displacement, the cooling system is immediately turned on to solidify the glass liquid in the annular gap 6. In specific operation, when the liquid level in the furnace body 1 after the raw materials are melted is h, the electrode 2 is pulled down by h / 10 for every 50°C above the glass melting temperature detected by the first temperature sensing element 18. For example, the electrode 2 is pulled down by 3h / 10 for every 150°C above the glass melting temperature detected by the first temperature sensing element 18. This allows the depth of the electrode 2 inserted into the furnace body 1 to match the larger power and heat the glass liquid as quickly as possible.

[0036] Finally, it should be specially pointed out that in all the contents recorded in the present invention, terms such as "include", "comprise", and other general statements are intended to cover non-exclusive inclusion technologies, so that the processes, articles and methods of the corresponding elements, or related equipment, mean not only including these technical elements, but also the inherent characteristics of a certain process, article, equipment and method.

[0037] As a person skilled in the art should be aware, any person familiar with the technical field can make adaptive improvements or equivalent replacements based on the above embodiments on the basis of a full understanding of the technical principles of the present invention. Therefore, these technical solutions that do not deviate from the core technical concept of the present invention should essentially be included in the scope of protection of the present invention.

Claims

1. An all-electric melting furnace for producing brown soda-lime glass tubes, comprising a furnace body (1) and electrodes (2) mounted in the furnace body (1), characterized in that: The electrode (2) is vertically mounted at the bottom of the furnace body (1), and the electrode (2) is inserted upwards into the furnace body (1) from a heat-insulating mounting portion (3) fixed on the outside of the bottom of the furnace body (1). A sealed ring sleeve (7) is vertically mounted in an axial hole of the heat-insulating mounting portion (3) for the electrode (2) to be axially inserted. The sealed ring sleeve (7) is initially located at a position near the bottom of the axial hole. A plurality of vertical flow channel holes close to the side wall of the electrode (2) are provided above the axial hole and communicate with the axial hole. A gate plate (9) is horizontally slidably provided on one side of the vertical flow channel hole. An annular cooling chamber (4) is coaxially provided on the outside of the axial hole, and a cooling system is provided in the cooling chamber (4); the electrode (2) is driven by a hydraulic push rod to move axially, and the hydraulic push rod is controlled by a controller. The controller can control the electrode (2) to be inserted upward into the furnace body (1) at the initial moment, so that the top of the electrode (2) is exposed to a certain length from the bottom of the furnace body (1); after the electrode (2) is energized, when the raw materials around the top of the electrode (2) are melted into glass liquid, the glass liquid can flow into the hole between the electrode (2) and the wall of the axial hole through the vertical flow channel hole. When the glass liquid accumulated above the sealed ring sleeve (7) reaches a set weight, the sealed ring sleeve (7) moves down to the bottom of the axial hole, and the liquid level of the glass liquid accumulated above the sealed ring sleeve (7) is still a distance away from the bottom port of the vertical drainage channel (8), and the gate plate (9) is inserted into the vertical drainage channel hole to close it. At this time, the controller starts the cooling system in the cooling chamber (4) to cool the glass liquid in the annular gap (6), so that the glass liquid is cooled and solidified and filled in the annular gap (6).

2. The all-electric melting furnace for producing brown soda-lime glass tubes according to claim 1, characterized in that: The bottom of the furnace body (1) is formed into a shallow concave surface at a location where the electrode (2) penetrates the bottom, and a plurality of vertical drainage channels (8) are provided around the shallow concave surface.

3. The all-electric melting furnace for producing brown soda-lime glass tubes according to claim 1, characterized in that: The cross section of the upper portion of the sealed ring sleeve (7) is rectangular, and the cross section of the lower portion is an isosceles trapezoid with a bottom side shorter than a top side. The bottom of the shaft hole can be socket-fitted with the lower portion of the sealed ring sleeve (7).

4. The all-electric melting furnace for producing brown soda-lime glass tubes according to claim 3, characterized in that: The sealed ring sleeve (7) is a hollow structure with a constant wall thickness, and the electrode (2) coaxially passes through the upper part of the sealed ring sleeve (7).

5. The all-electric melting furnace for producing brown soda-lime glass tubes according to claim 1, characterized in that: The bottom end of the closed ring sleeve (7) is connected to a Z-shaped crank arm (12), the upper part of the crank arm (12) vertically slides through the bottom of the shaft hole, and a pressing component (13) is provided at the lower part of the crank arm (12). The pressing component (13) supports the crank arm (12) so that the closed ring sleeve (7) is in an initial position, and the pressing component (13) controls the hydraulic telescopic rod (11) to push the gate plate (9) to move horizontally; a limiting ring (301) is integrally provided on the side wall of the shaft hole, and the inner side wall of the limiting ring (301) is a conical surface with the small end facing downward, and the top end of the closed ring sleeve (7) is in the initial position when in contact with the limiting ring (301).

6. The all-electric melting furnace for producing brown soda-lime glass tubes according to claim 5, characterized in that: The pressing component (13) includes a mounting seat hole (17) arranged at the center of the top, and a cylindrical spring (16) vertically installed on the opening of the mounting seat hole (17). A pressure plate (14) is coaxially placed on the top of the cylindrical spring (16). The pressure plate (14) is coaxially fixed to the conductor rod at the bottom end of the crank arm (12). When the closed ring sleeve (7) slides to the bottom of the shaft hole, the conductor rod is inserted into the mounting seat hole (17) and contacts the conductive sleeve embedded in the mounting seat hole (17), so that the hydraulic telescopic rod (11) extends.

7. The all-electric melting furnace for producing brown soda-lime glass tubes according to claim 5, characterized in that: A push plate (10) perpendicular to the gate plate (9) is fixed at the bottom thereof, and the push plate (10) is exposed at the bottom end of the heat-insulating mounting portion (3). The hydraulic telescopic rod (11) is connected to the push plate (10) to push the push plate (10) horizontally to move.

8. The all-electric melting furnace for producing brown soda-lime glass tubes according to claim 1, characterized in that: The condensation pipe (5) of the cooling system spirally surrounds the outer side of the shaft hole, and the cooling cavity (4) is filled with a heat exchange medium to remove the heat of the glass liquid in the shaft hole to achieve its condensation.

9. A fully electric melting furnace for producing brown soda-lime glass tubes according to any one of claims 1 to 8, characterized in that: A first temperature sensing element (18) is provided in the furnace body (1), and the first temperature sensing element (18) is provided below the liquid surface of the glass liquid formed after the raw materials in the furnace are fully melted. A second temperature sensing element is provided at the bottom of the furnace body (1); when the temperature detected by the first temperature sensing element (18) is higher than the glass melting temperature, and the temperature detected by the second temperature sensing element (19) is within the temperature resistance range of the material at the bottom of the furnace body (1), the power controller of the electrode (2) turns off the cooling system for a set time, and then immediately turns on the cooling system after the electrode (2) is pulled downward by a displacement.

10. The all-electric melting furnace for producing brown soda-lime glass tubes according to claim 9, characterized in that: When the liquid level in the furnace body (1) after the raw materials are put into the furnace (1) is h, the electrode (2) is pulled down by h / 10 for every 50°C increase in the temperature detected by the first temperature sensing element (18) above the glass melting temperature.

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