Energy-saving baking furnace for producing graphite electrode

Abstract

The utility model is used for graphite electrode production technical field discloses a kind of energy-saving type graphite electrode production with baking furnace, including base, the upper end of the base is fixed with furnace body, the inside of furnace body and base is provided with heat preservation material changing mechanism, by the way that furnace body and external space are not interconnected when feeding and discharging, reduce the heat loss in the heat exchange process inside furnace body, to reach the purpose of energy saving.The energy-saving type graphite electrode production with baking furnace, by setting heat preservation material changing mechanism in the inside of furnace body and base, make furnace body and external space not be interconnected when feeding and discharging, reduce the heat loss in the heat exchange process inside furnace body, solve the problem of large amount of heat energy loss caused by the violent convection of high-temperature gas in the furnace and external cold air due to frequent opening of furnace door when traditional baking furnace changes material, avoid the temperature drop in the furnace during each material changing process of traditional baking furnace and the additional consumption of about electric energy required for each temperature rising recovery to set temperature.

Description

Technical Field

[0001] This utility model relates to the field of graphite electrode production technology, specifically to an energy-saving calcining furnace for graphite electrode production. Background Technology

[0002] In the industrial production process of graphite electrodes, the calcination process is a crucial link that plays a decisive role in the quality and performance of the final product. The calcination furnace creates a high-temperature, sealed environment, causing the binder in the electrode green to undergo thermal decomposition and polymerization reactions, thereby achieving densification and strength enhancement of the carbon material. This endows the graphite electrode with excellent conductivity, oxidation resistance, and other key physicochemical properties. With the widespread application of graphite electrodes in high-temperature industrial fields such as electric arc furnace steelmaking and submerged arc furnaces, the market's requirements for its output and quality are becoming increasingly stringent. Technological innovation in calcination equipment has become an important driving force for the industry's development. Currently, most graphite electrode calcining furnaces on the market adopt intermittent or continuous operation modes. Intermittent calcining furnaces require frequent opening of the furnace door during material replacement, resulting in violent convection between the high-temperature gas inside the furnace and the cold air outside, causing a large amount of heat loss. Although continuous calcining furnaces optimize the operation process to a certain extent, it is still difficult to avoid heat leakage during the material loading and unloading process. According to industry statistics, the furnace temperature drops by an average of 100-150°C during each material replacement process in traditional calcining furnaces. Each time the temperature is raised back to the set temperature, it requires an additional 15-20% of electricity. This not only significantly increases the energy costs of enterprises, but also extends the production cycle and reduces equipment utilization. From the perspective of equipment structure, the feeding and discharging system design of traditional roasting furnaces has obvious defects. The loading and unloading process of materials usually relies on manual or simple mechanical assistance, making it difficult to achieve effective isolation between the furnace body and the external environment. In actual production, when the operator opens the furnace door, the high-temperature environment is exposed instantly, a large amount of hot air inside the furnace escapes, and cold air rushes in rapidly. This not only causes large fluctuations in furnace temperature, but also causes problems such as condensation on the furnace wall and erosion of refractory materials, shortening the service life of the equipment. In addition, frequent temperature fluctuations will cause uneven heating of graphite electrode green blanks during the roasting process, which can easily lead to quality defects such as cracks and deformation. Utility Model Content

[0003] The purpose of this invention is to provide an energy-saving calcining furnace for the production of graphite electrodes, so as to solve the problems mentioned in the background art, such as significant heat loss in the material changing and material feeding and unloading process of traditional graphite electrode calcining furnaces, which leads to product quality defects and short equipment life.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving calcining furnace for graphite electrode production, comprising a base, a furnace body fixedly mounted on the upper end of the base, and an electric heating tube fixedly mounted on the inner surface of the furnace body. A rotating sealing door is installed on the inner surface of one end of the base. The furnace body and the base are equipped with a heat-insulating material changing mechanism. By ensuring that the furnace body and the external space are not interconnected during material feeding and discharging, the heat loss inside the furnace body during material changing is reduced, thereby achieving the purpose of energy saving. The heat-insulating material-changing mechanism includes: a central motor, which is fixedly installed inside the upper part of the furnace body, and a central disk is fixedly connected to the lower end of the output shaft of the central motor. A sliding rod is fixedly installed on the lower surface of the central disk, and a sliding roasting seat is installed on the outer surface of the sliding rod. A connecting block is fixedly installed on the upper end face of the roasting seat. A cavity is opened on the side surface of the roasting seat, and a material box is placed inside the cavity on the side surface of the roasting seat. A displacement motor is fixedly installed inside the upper surface of the central disk, and the lower end of the output shaft of the displacement motor passes through the central disk. The lower surface of the pan has a displacement rod fixedly connected to the lower end of the output shaft of the displacement motor. A switching groove is provided at the connection between the lower end of the furnace body and the upper end of the base. A guide plate is fixedly installed inside the lower end of one side of the base, and an ejector motor is fixedly installed inside the lower end of the other side of the base. A rotating linkage gear is installed inside the base, and an ejector rod is fixedly connected to one end of the shaft of the linkage gear. An ejector frame is connected to the outer surface of the ejector rod, and the ejector frame is slidably connected to the base. A clearance groove is provided on the outer surface of the end of the roasting seat facing the center of the furnace body.

[0005] Preferably, the outer surface of the central disk is in contact with the inner surface of the upper end of the furnace body, and the central disk is engaged with the roasting seat by a connecting block.

[0006] The above technical solution enhances the sealing of the upper part of the furnace body by fitting the central plate with the furnace body, preventing hot air from escaping from the gap between the central plate and the furnace body during the roasting process. The interlocking connection structure allows the roasting seat to rotate synchronously with the central plate, ensuring that the material is heated evenly in the furnace. At the same time, it facilitates the radial sliding of the roasting seat by the displacement motor, meeting the position switching requirements when changing materials.

[0007] Preferably, the calcining seat and the displacement rod are connected by a thread, and the calcining seat has a fan-shaped design, and the vertical projection of the calcining seat completely coincides with the vertical projection of the switching slot.

[0008] Using the above technical solution, the threaded connection allows the displacement motor to precisely control the radial displacement of the roasting seat through the rotation of the displacement rod, facilitating switching between the "roasting position" and the "material changing position". The fan-shaped design and the projection coincide to ensure that when the roasting seat moves above the switching slot, its cavity is directly aligned with the ejection mechanism inside the base, ensuring that the material box can be accurately aligned with the ejection path during material changing, while avoiding heat leakage from the switching slot due to shape misalignment.

[0009] Preferably, one end of the guide plate is angled downwards, and the angled downwards end of the guide plate is directly opposite the sealing door.

[0010] Using the above technical solution, the downward-sloping guide plate provides a gravity-assisted sliding path for the material box, which facilitates the discharge of the roasted material box from the bottom of the furnace through the sealed door, or the pushing of the new material box into the base from the sealed door. The direct alignment with the sealed door ensures that the material box has a unique and precise entry and exit path, reducing the exposed area when the sealed door is opened. Combined with the isolation design of the heat preservation material changing mechanism, it further reduces heat loss during material changing.

[0011] Preferably, the adjacent linkage gears are meshed together, and one end of the output shaft of the ejector motor is fixedly connected to the shaft of the linkage gear directly opposite it.

[0012] Using the above technical solution, the meshing linkage gears can synchronously transmit the power of a single push-out motor to all push-out rods, ensuring that multiple push-out frames operate synchronously. This avoids material box ejection jamming or sealing failure caused by mechanical asynchrony. The direct drive structure improves power transmission efficiency, reduces energy loss, and ensures the stability and reliability of the push-out action.

[0013] Preferably, the ejector rod and the ejector frame are threadedly connected, and the threads on the surfaces of two adjacent ejector rods are in opposite directions. The ejector frame is C-shaped, and the number of ejector frames is the same as the number of relief grooves on the surface of the roasting seat. One end of the relief groove penetrates the inner surface of the cavity of the roasting seat.

[0014] Using the above technical solution, when the push-out rod is driven to rotate by the push-out motor, the adjacent push-out rods can move synchronously in the same direction because their threads are opposite. This ensures that multiple sets of push-out rods push the material box out of the roasting seat cavity simultaneously and stably. The C-shaped push-out rod can be accurately inserted into the clearance groove, and through the clearance groove that penetrates the inside of the cavity, it directly acts on the inside of the material box.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the energy-saving calcining furnace for producing graphite electrodes: 1. By setting up a heat-insulating material-changing mechanism inside the furnace body and base, the furnace body and the external space are not connected during material feeding and discharging, which reduces the heat loss inside the furnace body during material changing. This solves the problem of large heat loss caused by the violent convection between high-temperature gas inside the furnace and cold air outside due to frequent opening of the furnace door during material changing in traditional roasting furnaces. It also avoids the temperature drop inside the furnace during each material changing process in traditional roasting furnaces and the additional power consumption required to restore the temperature to the set temperature each time, thus achieving the purpose of energy saving. 2. Furthermore, by continuously raising and lowering the roasting seat during material discharge, the furnace body and the base are relatively sealed during material feeding and discharging. Combined with the method of pushing out the material box when the sealing door of the base is closed, the heat retention inside the base and furnace body is further ensured, and heat loss is further reduced. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional three-dimensional structure of this utility model; Figure 3 This is a three-dimensional structural diagram showing the connection between the base, furnace body, and heating element of this utility model. Figure 4 This is a three-dimensional structural diagram of the connection section of the base, the ejector rod, and the ejector frame of this utility model; Figure 5 This is a three-dimensional structural diagram of the cross-sectional view of the connection between the roasting seat and the relief groove of this utility model; Figure 6 This is a three-dimensional cross-sectional view of the overall working state of this utility model.

[0017] In the diagram: 1. Base; 2. Furnace body; 3. Heating element; 4. Sealing door; 5. Central motor; 6. Central plate; 7. Sliding rod; 8. Calcination seat; 9. Connecting block; 10. Material box; 11. Displacement motor; 12. Displacement rod; 13. Switching slot; 14. Guide plate; 15. Push-out motor; 16. Linkage gear; 17. Push-out rod; 18. Push-out frame; 19. Clearance slot. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-6 This utility model provides a technical solution: an energy-saving calcining furnace for the production of graphite electrodes.

[0020] Example 1: This example discloses: a base 1, a furnace body 2 fixedly installed on the upper end of the base 1, and an electric heating tube 3 fixedly installed on the inner surface of the furnace body 2. A rotating sealing door 4 is installed on the inner surface of one end of the base 1. The furnace body 2 and the base 1 are equipped with a heat-insulating material changing mechanism. By ensuring that the furnace body 2 is not connected to the external space during material feeding and discharging, the heat loss inside the furnace body 2 during material changing is reduced, thereby achieving the purpose of energy saving. The heating element 3 inside the furnace body 2 generates heat when energized, heating the space inside the furnace to create the high-temperature environment required for the baking of graphite electrode green blanks. The sealing door 4 is fixed to the base 1 by a rotating connection and remains closed during the baking process, ensuring that a sealed space is formed inside the furnace body 2 to reduce heat loss through the door gaps. When material needs to be changed, a non-direct contact material changing mechanism is used to change the material between the inside of the furnace and the outside environment. During the refueling process, the interior of furnace body 2 is never directly connected to the external space, avoiding the loss of heat and the influx of cold air caused by the traditional "open door refueling" method, thereby reducing heat loss. This design isolates the high-temperature environment through physical structure, replacing the traditional refueling method that relies on the opening and closing of the furnace door, and fundamentally solves the problem of heat loss.

[0021] Example 2: This example discloses, based on Example 1, that the heat-insulating material-changing mechanism includes: a central motor 5, which is fixedly installed inside the upper end of the furnace body 2, and a central disk 6 is fixedly connected to the lower end of the output shaft of the central motor 5. A sliding rod 7 is fixedly installed on the lower surface of the central disk 6, and a sliding roasting seat 8 is installed on the outer surface of the sliding rod 7. A connecting block 9 is fixedly installed on the upper end face of the roasting seat 8. A cavity is opened on the side surface of the roasting seat 8, and a material box 10 is placed inside the cavity on the side surface of the roasting seat 8. A displacement motor 11 is fixedly installed inside the upper surface of the central disk 6, and the lower end of the output shaft of the displacement motor 11... The lower surface of the central plate 6 is penetrated, and the lower end of the output shaft of the displacement motor 11 is fixedly connected to the displacement rod 12. A switching groove 13 is provided at the connection between the lower end of the furnace body 2 and the upper end of the base 1. A guide plate 14 is fixedly installed inside the lower end of one side of the base 1, and an ejection motor 15 is fixedly installed inside the lower end of the other side of the base 1. A rotating linkage gear 16 is installed inside the base 1, and an ejection rod 17 is fixedly connected to one end of the shaft of the linkage gear 16. An ejection frame 18 is connected to the outer surface of the ejection rod 17, and the ejection frame 18 is slidably connected to the base 1. A clearance groove 19 is provided on the outer surface of the end of the roasting seat 8 facing the center of the furnace body 2. The outer surface of the center plate 6 is in contact with the inner surface of the upper end of the furnace body 2, and the center plate 6 is connected to the roasting seat 8 by the connecting block 9. The roasting seat 8 and the displacement rod 12 are connected by threads, and the roasting seat 8 has a fan-shaped design. The vertical projection of the roasting seat 8 is completely superimposed on the vertical projection of the switching slot 13. One end of the guide plate 14 is set at an angle downwards, and the end of the guide plate 14 that is set at an angle downwards is directly opposite the sealing door 4; The adjacent linkage gears 16 are meshed and connected, and one end of the output shaft of the push motor 15 is fixedly connected to the rotating shaft of the linkage gear 16 directly opposite it. The ejector rod 17 and the ejector frame 18 are threadedly connected, and the threads on the surfaces of two adjacent ejector rods 17 are opposite in direction. The ejector frame 18 is C-shaped, and the number of ejector frames 18 is the same as the number of relief grooves 19 on the surface of the roasting seat 8. One end of the relief groove 19 penetrates the inner surface of the cavity of the roasting seat 8. The displacement motor 11 drives the displacement rod 12 to rotate. Since the calcining seat 8 and the displacement rod 12 are threadedly connected, the calcining seat 8 slides along the sliding rod 7 towards the upper end of the furnace body 2 and is fixed by the connecting block 9 and the central plate 6. The cavity on the side surface of the calcining seat 8 accommodates the material box 10, and the graphite electrode green blank is placed in the material box 10. The central motor 5 drives the central disk 6 to rotate, causing the roasting seat 8 and material box 10 to rotate at a uniform speed within the furnace body 2, ensuring that the material is heated evenly and avoiding quality defects caused by local overheating or uneven heating. After roasting, the central motor 5 restarts, rotating the roasting seat 8 containing the old material through the switching slot 13 to the corresponding position within the base 1. The push-out motor 15 drives the linkage gear 16 to rotate. Since adjacent linkage gears 16 are meshed, they drive all push-out rods 17 to rotate. The push-out rods 17 are threadedly connected to the push-out frame 18, and the threads of adjacent push-out rods 17 are opposite in direction. Therefore, during rotation, all push-out frames 18 move towards the roasting seat 8, and their C-shaped structures engage. The relief groove 19 of the roasting seat 8 pushes the material box 10 out of the cavity of the roasting seat 8. The pushed-out material box 10 slides obliquely downward along the guide plate 14 to the sealing door 4. Then the roasting seat 8 moves upward and resets. Then the sealing door 4 is opened to take out the material box 10 containing the old material and put in the material box 10 containing the raw material. At this time, the displacement motor 11 drives the displacement rod 12 to rotate again, so that the roasting seat 8 slides downward to the furnace body 2. The material box 10 is pushed out of the roasting seat 8 by the tool. Then the sealing door 4 is closed and the roasting seat 8 is driven to move upward and reset. The central motor 5 drives the new material to start rotating and roasting. The above process is repeated to reduce heat loss and achieve energy saving.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving calcining furnace for producing graphite electrodes, comprising a base (1), a furnace body (2) fixedly mounted on the upper end of the base (1), and an electric heating tube (3) fixedly mounted on the inner surface of the furnace body (2), and a rotating sealed door (4) installed on the inner surface of one end of the base (1), characterized in that: The furnace body (2) and the base (1) are equipped with a heat-insulating material-changing mechanism. By ensuring that the furnace body (2) is not connected to the external space during material feeding and discharging, the heat loss inside the furnace body (2) during material changing is reduced, thereby achieving the purpose of energy saving.

2. The energy-saving calcining furnace for producing graphite electrodes according to claim 1, characterized in that: The heat preservation and material changing mechanism includes: a central motor (5), which is fixedly installed inside the upper end of the furnace body (2), and a central disk (6) is fixedly connected to the lower end of the output shaft of the central motor (5). A sliding rod (7) is fixedly provided on the lower surface of the central disk (6), and a sliding roasting seat (8) is installed on the outer surface of the sliding rod (7). A connecting block (9) is fixedly provided on the upper end face of the roasting seat (8). A cavity is opened on the side surface of the roasting seat (8), and a material box (10) is placed inside the cavity on the side surface of the roasting seat (8). A displacement motor (11) is fixedly installed inside the upper surface of the central disk (6), and the lower end of the output shaft of the displacement motor (11) penetrates the lower surface of the central disk (6). A displacement rod (12) is fixedly connected to the lower end of the output shaft of the displacement motor (11). A switching groove (13) is provided at the connection between the lower end of the furnace body (2) and the upper end of the base (1). A guide plate (14) is fixedly installed inside the lower end of one side of the base (1), and a push-out motor (15) is fixedly installed inside the lower end of the other side of the base (1). A rotating linkage gear (16) is installed inside the base (1), and a push-out rod (17) is fixedly connected to one end of the shaft of the linkage gear (16). A push-out frame (18) is connected to the outer surface of the push-out rod (17), and the push-out frame (18) is slidably connected to the base (1). A clearance groove (19) is provided on the outer surface of the end of the roasting seat (8) facing the center of the furnace body (2).

3. The energy-saving calcining furnace for producing graphite electrodes according to claim 2, characterized in that: The outer surface of the central disk (6) is in contact with the inner surface of the upper end of the furnace body (2), and the central disk (6) is engaged with the roasting seat (8) through the connecting block (9).

4. The energy-saving calcining furnace for producing graphite electrodes according to claim 2, characterized in that: The roasting seat (8) and the displacement rod (12) are connected by threads, and the roasting seat (8) is designed in a fan shape. The vertical projection of the roasting seat (8) and the vertical projection of the switching groove (13) are completely coincident.

5. The energy-saving calcining furnace for producing graphite electrodes according to claim 2, characterized in that: One end of the guide plate (14) is set at an angle downward, and the end of the guide plate (14) set at an angle downward is directly opposite the sealing door (4).

6. The energy-saving calcining furnace for producing graphite electrodes according to claim 2, characterized in that: The adjacent linkage gears (16) are meshed and connected, and one end of the output shaft of the push motor (15) is fixedly connected to the shaft of the linkage gear (16) directly opposite it.

7. The energy-saving calcining furnace for producing graphite electrodes according to claim 2, characterized in that: The push rod (17) and the push frame (18) are threaded together, and the threads on the surfaces of two adjacent push rods (17) are opposite in direction. The push frame (18) is C-shaped, and the number of push frames (18) is the same as the number of relief grooves (19) on the surface of the roasting seat (8). One end of the relief groove (19) penetrates the inner surface of the cavity of the roasting seat (8).

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