Graphite electrode for a synthetic mica sheet melting furnace

Abstract

The utility model discloses a graphite electrode of synthetic mica sheet melting furnace, including the graphite electrode body (1) of cylindrical structure, the one end outer periphery of graphite electrode body (1) is provided with the setting of connecting barrel, and make graphite electrode body (1) at least partial exposure in the other end of connecting barrel, the connecting barrel includes the inner layer cylinder wall (2) and outer layer cylinder wall (3), and the inner layer cylinder wall (2) is fixedly connected with graphite electrode body (1), and the outer layer cylinder wall (3) is fixedly connected with melting furnace through flange (4), the inner layer cylinder wall (2) with outer layer cylinder wall (3) between configuration protection gas passage (5), the end face of connecting barrel is provided with the air inlet (6) of being linked with protection gas passage (5). Can effectively isolate the strong oxidizing atmosphere in melting furnace, slows down graphite electrode oxidation, prolongs the life.

Description

Technical Field

[0001] This utility model relates to the technical field of synthetic mica sheet production and manufacturing equipment, specifically to a graphite electrode for a synthetic mica sheet melting furnace. Background Technology

[0002] The production of synthetic mica sheets requires a high-temperature melting process to achieve full reaction and controlled crystallization of raw materials. This process relies on graphite electrodes as conductive components. Furthermore, the melting furnace contains a highly oxidizing atmosphere created by oxygen, causing traditional graphite electrodes to suffer severe oxidative corrosion. Carbon monoxide and carbon dioxide rapidly form on the surface of the graphite electrodes, leading to uniform deterioration of the electrode diameter, increased resistance, and decreased mechanical strength. This not only shortens the electrode's lifespan but also results in low production efficiency, increased energy consumption, and fluctuating product yield due to frequent furnace shutdowns for replacement.

[0003] Current methods to mitigate the oxidation problem of graphite electrodes include spraying a ceramic particle coating onto its surface or doping the graphite electrode with metal powder. However, these methods will more or less reduce the conductivity of the graphite electrode. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a graphite electrode for a synthetic mica sheet melting furnace.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A graphite electrode for a synthetic mica sheet melting furnace includes a cylindrical graphite electrode body. A connecting cylinder is fitted around one end of the graphite electrode body, and at least part of the other end of the graphite electrode body is exposed outside the connecting cylinder. The connecting cylinder includes an inner cylinder wall and an outer cylinder wall. The inner cylinder wall is fixedly connected to the graphite electrode, and the outer cylinder wall is fixedly connected to the melting furnace through a flange. A protective gas channel is formed between the inner cylinder wall and the outer cylinder wall. An air inlet communicating with the protective gas channel is provided on the end face of the connecting cylinder.

[0006] As a preferred technical solution, the length of the outer cylinder wall located inside the melting furnace exceeds that of the inner cylinder wall.

[0007] As a preferred technical solution, the outer cylinder wall located on the inner side of the melting furnace extends to the inner cylinder wall, and the protective gas channel between the outer cylinder wall and the inner cylinder wall at the end of the connecting cylinder has an angle θ with the vertical direction, the value of which is in the range of 30-45°.

[0008] As a preferred technical solution, the cross-sectional area of ​​the protective gas channel decreases from the outside of the melting furnace to the inside of the melting furnace.

[0009] As a preferred technical solution, the air inlet is connected to an argon cylinder or a nitrogen cylinder.

[0010] As a preferred technical solution, the total length of the connecting cylinder is 1 / 2 to 2 / 3 of the length of the graphite electrode body.

[0011] As a preferred technical solution, the end of the connecting cylinder is provided with a power connection port, and the graphite electrode body is provided with a threaded connection surface passing through the power connection port.

[0012] As a preferred technical solution, a flow divider is provided between the outer cylinder wall and the inner cylinder wall.

[0013] As a preferred technical solution, the connecting cylinder has a left and right split structure, and the connecting cylinder can be detachably assembled through a connecting hole provided between the inner cylinder wall and the outer cylinder wall.

[0014] As a preferred technical solution, a locking block is embedded in the contact surface between the inner cylinder wall and the graphite electrode body, and the graphite electrode body is provided with a slot adapted to the locking block.

[0015] The advantages and beneficial effects of this utility model are that, by setting a protective gas channel in the connecting cylinder and introducing inert gases such as argon or nitrogen, the graphite electrode effectively isolates the direct erosion of the electrode body by the strong oxidizing atmosphere in the melting furnace, significantly slows down the oxidation rate of the electrode surface, and extends the service life of the electrode. The optimization of the shape and angle of the protective gas channel further improves the uniformity of gas coverage and the protective effect, avoiding the adverse effects of traditional coating or doping methods on conductivity. Attached Figure Description

[0016] Figure 1 This is one of the cross-sectional structural schematic diagrams of this utility model; Figure 2 This is the second sectional structural schematic diagram of this utility model; Figure label: 1-Graphite electrode body, 2-Inner cylinder wall, 3-Outer cylinder wall, 4-Flange, 5-Protective gas channel, 6-Air inlet, 7-Included angle θ, 8-Power connection port, 9-Threaded connection surface, 10-Diverter plate, 11-Connection hole, 12-Card block, 13-Card slot. Detailed Implementation

[0017] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0018] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0019] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly or implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0020] To effectively isolate the strong oxidizing atmosphere inside the melting furnace, slow down the oxidation of the graphite electrode, and extend its service life, the technical solution provided in this embodiment is a graphite electrode for a synthetic mica sheet melting furnace, comprising a graphite electrode body 1 with a cylindrical structure. A connecting cylinder is sleeved around one end of the graphite electrode body 1, and at least part of the other end of the graphite electrode body 1 is exposed outside the connecting cylinder. The connecting cylinder includes an inner cylinder wall 2 and an outer cylinder wall 3. The inner cylinder wall 2 is fixedly connected to the graphite electrode body 1, and the outer cylinder wall 3 is fixedly connected to the melting furnace through a flange 4. A protective gas channel 5 is formed between the inner cylinder wall 2 and the outer cylinder wall 3. An air inlet 6 communicating with the protective gas channel 5 is provided on the end face of the connecting cylinder. The corresponding mechanical action and technical effect are as follows: The connecting cylinder is fixed to the melting furnace through the flange 4. The protective gas enters the protective gas channel 5 from the air inlet 6 to form an air curtain barrier. Considering that existing melting furnaces are usually equipped with structures for the inflow and outflow of protective gas, it is generally advisable that this utility model does not have an exhaust port. Alternatively, an open furnace body can be used for exhaust. Unlike the traditional method of passing protective gas inside the furnace, this utility model blows the protective gas from the far end of the graphite electrode body 1, which can form a gas film on the graphite electrode body. This gas film will not affect the discharge of the graphite electrode, but it can relatively isolate it from oxygen, thereby achieving the protection of the graphite electrode body.

[0021] To further enhance the gas barrier effect and prevent the infiltration of oxidizing atmosphere from the furnace, the technical solution provided in this embodiment is as follows: the outer cylinder wall 3 located on the inner side of the melting furnace extends beyond the inner cylinder wall 2. To optimize the outflow direction of the protective gas and make it more uniformly cover the electrode surface, the technical solution provided in this embodiment is as follows: the outer cylinder wall 3 located on the inner side of the melting furnace extends towards the inner cylinder wall 2, and the protective gas channel 5 located at the end of the connecting cylinder between the outer cylinder wall 3 and the inner cylinder wall 2 forms an angle θ7 with the vertical direction, the value of which is in the range of 30-45°. The inclined gas channel guides the protective gas to blow towards the electrode surface at a certain angle, forming a more uniform gas coverage layer, enhancing the protective effect, and avoiding local oxidation.

[0022] To increase the flow rate and pressure of the protective gas within the channel and ensure effective penetration of the gas into the furnace opening area, the technical solution provided in this embodiment is as follows: the cross-sectional area of ​​the protective gas channel 5 decreases from the outside to the inside of the molten furnace. As the channel cross-section gradually narrows, the gas accelerates during flow, forming a high-speed airflow that effectively penetrates the high-temperature area of ​​the furnace opening, maintaining a stable gas curtain barrier.

[0023] To provide a stable and pure protective gas source, the technical solution provided in this embodiment is as follows: the gas inlet 6 is connected to an argon or nitrogen cylinder. An inert gas (such as argon or nitrogen) is supplied through a high-pressure cylinder, with the output pressure typically controlled between 0.2 and 0.5 MPa, ensuring a continuous and stable flow of gas into the protective gas channel, forming a reliable gas protective layer.

[0024] To balance the electrode protection range, the technical solution provided in this embodiment is as follows: the total length of the connecting cylinder is 1 / 2 to 2 / 3 of the length of the graphite electrode body 1. The moderate length of the connecting cylinder provides sufficient protection for critical electrode components while avoiding any impact on electrode installation and thermal conductivity due to excessive length.

[0025] To facilitate the connection between the electrode and the power supply system, the technical solution provided in this embodiment is as follows: a power connection port 8 is provided at the end of the connecting cylinder, and a threaded connection surface 9 is provided through the power connection port 8 on the graphite electrode body 1. Here, the threaded connection surface is usually constructed as a conical surface, which is used to achieve a quick and reliable connection between the electrode and the power supply wire through the power interface via the threaded connection surface 9.

[0026] To optimize the uniformity of gas distribution within the channel, this embodiment provides the following technical solution: a flow divider 10 is provided between the outer cylinder wall 3 and the inner cylinder wall 2. The flow divider 10 diverts the protective gas, preventing direct airflow or uneven distribution, thereby improving the uniformity of gas coverage and the protective effect.

[0027] To facilitate the disassembly and maintenance of the connecting cylinder, the technical solution provided in this embodiment is as follows: the connecting cylinder has a left and right split structure, and the connecting cylinder can be detachably assembled through the connecting hole 11 located between the inner cylinder wall 2 and the outer cylinder wall 3. The split design facilitates disassembly for cleaning or replacement of damaged parts, and the connecting hole 11 enables quick assembly and fixation through bolts or pins, improving maintenance efficiency.

[0028] To ensure a stable connection between the inner cylinder wall and the graphite electrode body and prevent relative slippage, the technical solution provided in this embodiment is as follows: a locking block 12 is embedded on the mating surface of the inner cylinder wall 2 and the graphite electrode body 1, and the graphite electrode body 1 is provided with a slot 13 adapted to the locking block 12. The cooperation between the locking block 12 and the slot 13 achieves mechanical interlocking, preventing the electrode from shifting due to thermal expansion or vibration under high temperature conditions, and ensuring structural stability.

[0029] The working principle of this invention is as follows: Inert gases such as argon or nitrogen are introduced through the protective gas channel 5 in the connecting cylinder. The gas enters from the inlet 6, is evenly distributed by the diverter plate 10, and then flows out rapidly along the converging channel. Finally, it covers the exposed surface of the graphite electrode body 1 at a certain angle, forming a continuous and stable gas curtain barrier. This effectively isolates the high-temperature oxidizing atmosphere inside the melting furnace, significantly delaying electrode oxidation and extending its service life. Simultaneously, the split connecting cylinder structure and the locking block-slot design facilitate maintenance and ensure reliable electrode connection under high-temperature conditions.

[0030] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A graphite electrode for a mica sheet melting furnace, characterized in that, The system includes a cylindrical graphite electrode body (1), with a connecting cylinder fitted around one end of the graphite electrode body (1) and at least partially exposing the other end of the graphite electrode body (1) outside the connecting cylinder. The connecting cylinder includes an inner cylinder wall (2) and an outer cylinder wall (3). The inner cylinder wall (2) is fixedly connected to the graphite electrode body (1), and the outer cylinder wall (3) is fixedly connected to the melting furnace through a flange (4). A protective gas channel (5) is formed between the inner cylinder wall (2) and the outer cylinder wall (3). An air inlet (6) communicating with the protective gas channel (5) is provided on the end face of the connecting cylinder.

2. The graphite electrode according to claim 1, characterized in that, The outer cylinder wall (3) located inside the melting furnace extends beyond the inner cylinder wall (2).

3. The graphite electrode according to claim 2, characterized in that, The outer cylinder wall (3) located inside the melting furnace extends to the inner cylinder wall (2). The protective gas channel (5) located at the end of the connecting cylinder between the outer cylinder wall (3) and the inner cylinder wall (2) has an angle θ (7) with the vertical direction. The value of the angle θ (7) is in the range of 30-45°.

4. The graphite electrode according to claim 1, characterized in that, The cross-sectional area of ​​the protective gas channel (5) decreases from the outside of the melting furnace to the inside of the melting furnace.

5. The graphite electrode according to claim 1, characterized in that, The air inlet (6) is connected to an argon cylinder or a nitrogen cylinder.

6. The graphite electrode according to claim 1, characterized in that, The total length of the connecting cylinder is 1 / 2 to 2 / 3 of the length of the graphite electrode body (1).

7. The graphite electrode according to claim 1, characterized in that, The end of the connecting cylinder is provided with a power connection port (8), and the graphite electrode body (1) passes through the power connection port (8) and is provided with a threaded connection surface (9).

8. The graphite electrode according to claim 1, characterized in that, A flow divider (10) is provided between the outer cylinder wall (3) and the inner cylinder wall (2).

9. The graphite electrode according to claim 1, characterized in that, The connecting cylinder has a left and right split structure, and the connecting cylinder can be detachably assembled through the connecting hole (11) between the inner cylinder wall (2) and the outer cylinder wall (3).

10. The graphite electrode according to claim 9, characterized in that, The inner cylindrical wall (2) and the graphite electrode body (1) are fitted with a locking block (12), and the graphite electrode body (1) is provided with a slot (13) adapted to the locking block (12).

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