Hot end firing furnace for silicon carbide electric heating element

Abstract

The utility model discloses a silicon carbide electric heating element hot end firing furnace which comprises a firing furnace body, a movable feeding device is arranged at the inlet end of the firing furnace body, a furnace door is installed on the movable feeding device, supports are symmetrically installed on the movable feeding device, a support is placed between the supports, and the supports are connected with the firing furnace body. The utility model relates to the technical field of silicon carbide electric heating element sintering equipment, the annular brackets are rotatably provided with the bearing frames through the rotation limiting assemblies, so that the bearing frames are always kept in a horizontal state under the action of gravity, silicon carbide rods to be sintered are placed in the bearing frames, and the silicon carbide rods to be sintered are placed in the bearing frames. The silicon carbide rods are limited and fixed through the clamping fixing pieces on the bearing frame, meanwhile, rotation control over the annular bracket can be achieved in cooperation with the driving assembly on the outer side of the furnace door, then the silicon carbide rods continuously rotate in the circumferential direction in the sintering operation process, and heating is more uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of silicon carbide electric heating element sintering equipment, in particular to a silicon carbide electric heating element hot end sintering furnace. Background Art

[0002] Silicon carbide rods are rod-shaped or tubular non-metallic high-temperature electric heating elements made of high-purity silicon carbide as the main raw material, processed into blanks according to a certain material ratio, and sintered at 2200℃ high temperature siliconization recrystallization. For the manufacture of silicon carbide rods, the silicon carbide content at the hot end and the cold end is carefully designed; in order to ensure that the silicon carbide rods can still maintain excellent performance in a high temperature environment, the silicon carbide part of the hot end adopts self-bonding sintering technology; this self-bonding sintering technology makes the silicon carbide structure at the hot end more compact and higher in purity, thereby ensuring the stability and reliability of the silicon carbide rods at high temperatures; the hot end sintering furnaces commonly used in the prior art for silicon carbide electric heating elements are mostly vacuum induction sintering furnaces. In practice, it has been found that the internal heat source and the silicon carbide rods of the existing induction sintering furnaces are relatively static, resulting in uneven heating of the silicon carbide rods at different positions. During induction sintering, the silicon carbide rods are prone to cracks, which seriously affects the yield and production quality of the silicon carbide rods. In view of this, in-depth research was conducted on the above-mentioned issues, and this case was created. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a hot end sintering furnace for silicon carbide electric heating elements, which solves the problems raised in the background technology.

[0004] To achieve the above objectives, the utility model is implemented through the following technical solutions: a hot end sintering furnace for silicon carbide electric heating elements, comprising a sintering furnace body, a mobile feeding device is provided at the inlet end of the sintering furnace body, a furnace door is installed on the mobile feeding device, supports are symmetrically installed on the mobile feeding device, brackets are placed between the supports, a pair of annular brackets are rotatably installed on the brackets, the annular brackets are connected to a fixed shaft and rotatably cooperate with the supports through the fixed shaft, rotation limit assemblies are symmetrically provided on the upper edge of the annular array on the inner ring surface of the annular bracket, a supporting bracket is assembled and connected on the rotation limit assembly, and clamping fixings are symmetrically provided on the inner wall of the supporting bracket, a connecting shaft is rotatably provided on the furnace door, one end of the connecting shaft is assembled and fixed to the fixed shaft, and a driving assembly is connected to the exposed end of the connecting shaft.

[0005] The rotation limiting assembly comprises a threaded sleeve, a limiting bolt and an optical axis. The threaded sleeve is embedded in the annular bracket, the limiting bolt is screwed into the threaded sleeve, and the optical axis is welded to one end of the limiting thread and rotatably cooperates with the supporting bracket.

[0006] The above-mentioned clamping fixing member includes an L-shaped support rod, an arc-shaped support plate and a buckle plate. The L-shaped support rod is symmetrically arranged on the lower end surface of the support bracket, the arc-shaped support plate is installed on one end of the L-shaped support rod, and the buckle plate is slidably mounted on the arc-shaped support plate.

[0007] The arc-shaped support plate is symmetrically provided with hemispherical grooves on both sides, and a strip-shaped shallow groove is provided on one side of the hemispherical groove. The depth of the strip-shaped shallow groove is smaller than the radius of the hemispherical groove. A hemispherical protrusion is provided on the inner wall surface of the buckle plate, and the hemispherical protrusion is slidably matched with the strip-shaped shallow groove.

[0008] The above-mentioned driving assembly includes a driving motor, a reducer, a transmission shaft and a water-cooling cooling component. The driving motor is arranged on the outside of the furnace door, the input end of the reducer is connected to the output end of the driving motor, one end of the transmission shaft is connected to the output end of the reducer, and the other end is connected to the connecting shaft. The water-cooling cooling component is sleeved on the outside of the transmission shaft and is rotatably sealed with the transmission shaft, and annular heat dissipation fins are evenly welded on the transmission shaft.

[0009] The water-cooling component comprises a heat exchange silo and a water chiller. The heat exchange silo is sleeved on the outside of the transmission shaft, and both ends of the inlet and outlet of the water chiller are respectively connected to the side walls of the heat exchange silo.

[0010] The utility model provides a hot end sintering furnace for silicon carbide electric heating elements. It has the following beneficial effects: the hot end sintering furnace for silicon carbide electric heating elements improves the existing sintering furnace body, adds a rotatable annular bracket on the mobile feeding device, and rotatably assembles the support bracket on the annular bracket through a rotating limit assembly, so that the support bracket always maintains a horizontal state under the action of gravity, places the silicon carbide rod to be sintered in the support bracket, and uses the clamping fixing parts on the support bracket to limit and fix the silicon carbide rod, and cooperates with the driving assembly on the outer side of the furnace door to realize the rotation control of the annular bracket, so that the silicon carbide rod continuously rotates in the circumferential direction during the sintering operation, and is heated more evenly, avoiding cracks in the silicon carbide rod due to uneven heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the main cross-sectional structure of a hot-end sintering furnace for a silicon carbide electric heating element described in the utility model.

[0012] Figure 2 It is a schematic diagram of the axonometric structure of the annular bracket of the utility model.

[0013] Figure 3 For this utility model Figure 2 Schematic diagram of the side cross-sectional structure.

[0014] Figure 4 It is a three-dimensional structural schematic diagram of the support frame of the utility model.

[0015] Figure 5 It is a schematic diagram of the axonometric structure of the clamping fixture of the utility model.

[0016] Figure 6 It is a schematic diagram of the three-dimensional structure of the gusset plate of the utility model.

[0017] Figure 7 For this utility model Figure 2 Schematic diagram of the local enlarged structure at position a.

[0018] In the figure: 1. sintering furnace body; 2. mobile feeding device; 3. furnace door; 4. support; 5. bracket; 6. annular bracket; 7. supporting bracket; 8. connecting shaft; 9. threaded sleeve; 10. limit bolt; 11. optical axis; 12. L-shaped support rod; 13. arc-shaped support plate; 14. buckle plate; 15. hemispherical groove; 16. strip shallow groove; 17. hemispherical protrusion; 18. driving motor; 19. reducer; 20. transmission shaft; 21. heat exchange cylinder; 22. chiller. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Through the personnel in this field, all the electrical components in this case are connected to their corresponding power supplies through wires, and a suitable controller should be selected according to the actual situation to meet the control requirements. The specific connection and control sequence should refer to the following working principle, and the electrical connection between the electrical components is completed in the order of working in sequence. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and does not explain the electrical control.

[0021] Embodiment: In conjunction with the specification Figure 1-7It can be seen that the present scheme specifically designs a hot end sintering furnace for silicon carbide electric heating elements, including a sintering furnace body 1, a mobile feeding device 2 is provided at the inlet end of the sintering furnace body 1, a furnace door 3 is installed on the mobile feeding device 2, a support 4 is symmetrically installed on the mobile feeding device 2, a bracket 5 is placed between the supports 4, a pair of annular brackets 6 are rotatably installed on the bracket 5, the annular bracket 6 is connected to the fixed shaft and is rotatably matched with the support 4 through the fixed shaft, a rotation limit assembly is symmetrically provided on the upper ring surface of the annular bracket 6, a support bracket 7 is assembled and connected to the rotation limit assembly, a clamping fixing piece is symmetrically provided on the inner wall of the support bracket 7, a connecting shaft 8 is rotatably provided on the furnace door 3, and one end of the connecting shaft 8 is connected to the fixed shaft. The fixed axis is assembled and fixed, and the exposed end of the connecting axis 8 is connected to a driving component. This scheme improves the existing sintering furnace body 1, and a rotatable annular bracket 6 is added to the mobile feeding device 2. The annular bracket 6 is rotatably assembled with a supporting bracket 7 by a rotating limit assembly, so that the supporting bracket 7 always maintains a horizontal state under the action of gravity, and the silicon carbon rod to be sintered is placed in the supporting bracket 7, and the silicon carbon rod is limited and fixed by the clamping fixing parts on the supporting bracket 7. At the same time, the driving component on the outside of the furnace door 3 can realize the rotation control of the annular bracket 6, so that the silicon carbon rod continuously rotates in the circumferential direction during the sintering operation, and the heating is more even, avoiding cracks in the silicon carbon rod due to uneven heating.

[0022] In the specific implementation process, the above-mentioned rotation limit assembly includes a threaded sleeve 9, a limit bolt 10 and an optical axis 11. The threaded sleeve 9 is embedded in the annular bracket 6, and the limit bolt 10 is screwed into the threaded sleeve 9. The optical axis 11 is welded to one end of the limit thread and rotates with the support bracket 7. It has a simple structure and high reliability, and can realize rapid assembly and fixation of the support bracket 7. The assembled support bracket 7 can always remain horizontal under the action of gravity, so that the silicon carbon rod is heated more evenly.

[0023] In the specific implementation process, the above-mentioned clamping fixing member includes an L-shaped support rod 12, an arc-shaped support plate 13 and a gusset plate 14, the L-shaped support rod 12 is symmetrically arranged on the lower end surface of the support bracket 7, the arc-shaped support plate 13 is installed on one end of the L-shaped support rod 12, and the gusset plate 14 is slidably sleeved on the arc-shaped support plate 13, wherein the arc-shaped support plate 13 is symmetrically provided with hemispherical grooves 15 on both sides, and a strip-shaped shallow groove 16 is provided on one side of the hemispherical groove 15, and the depth of the strip-shaped shallow groove 16 is less than the radius of the hemispherical groove 15, and the inner wall surface of the gusset plate 14 A hemispherical protrusion 17 is provided on the upper surface, and the hemispherical protrusion 17 is slidably matched with the strip shallow groove 16. When in use, the two ends of the silicon carbon rod are respectively placed on the arc-shaped supporting plate 13, and the sliding buckle plate 14 makes the buckle plate 14 slide in the horizontal direction under the cooperation of the strip shallow groove 16 and the hemispherical protrusion 17. When the hemispherical protrusion 17 is inserted into the hemispherical groove 15, the buckle plate 14 is locked to complete the limiting fixation of the silicon carbon rod. The limiting stability is good, the operation is extremely convenient, and the efficiency of taking and placing the silicon carbon rod can be effectively improved.

[0024] In the specific implementation process, as a preferred setting, the above-mentioned driving assembly includes a driving motor 18, a reducer 19, a transmission shaft 20 and a water-cooling cooling component. The driving motor 18 is arranged on the outside of the furnace door 3, and the input end of the reducer 19 is connected to the output end of the driving motor 18. One end of the transmission shaft 20 is connected to the output end of the reducer 19, and the other end is connected to the connecting shaft 8. The water-cooling cooling component is sleeved on the outside of the transmission shaft 20 and is rotatably sealed with the transmission shaft 20. Annular heat dissipation fins are uniformly welded on the transmission shaft 20, wherein the water-cooling cooling component includes a heat exchange cylinder 21 warehouse and a chiller 22. The heat exchange cylinder 21 warehouse is sleeved on the outside of the transmission shaft 20, and the inlet and outlet ends of the chiller 22 are respectively connected to the side walls of the heat exchange cylinder 21 warehouse. When in use, the silicon carbon rod is placed after completion , the furnace door 3 of the feeding device is closed, the drive motor 18 is started, and the drive motor 18 and the reducer 19 are used to cooperate to drive the transmission shaft 20, the connecting shaft 8, the fixed shaft and the annular bracket 6 to rotate synchronously, so that the silicon carbon rod rotates at a uniform speed in the furnace and is heated more evenly. During the sintering operation, part of the heat in the furnace will be transferred to the transmission shaft 20 through the connecting shaft 8. In order to prevent the overheating of the transmission shaft 20 from affecting the reducer 19 and the drive motor 18, the water cooler is used for circulating refrigeration, and the low-temperature water is injected into the heat exchange cylinder 21 through the water outlet. The heat at the position of the transmission shaft 20 is taken away by the heat exchange fins, and the high-temperature water after heat exchange is returned through the inlet of the chiller 22, so as to realize the recycling of cooling water and improve the overall stability and safety of the equipment.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot end sintering furnace for silicon carbide electric heating elements, comprising a sintering furnace body, wherein a mobile feeding device is provided at the inlet end of the sintering furnace body, and a furnace door is installed on the mobile feeding device, characterized in that: Supports are symmetrically installed on the mobile feeding device, brackets are placed between the supports, a pair of annular brackets are rotatably installed on the brackets, the annular brackets are connected to the fixed shaft and rotatably cooperate with the supports through the fixed shaft, rotation limit assemblies are symmetrically arranged on the upper edge of the annular array on the inner ring surface of the annular bracket, a supporting bracket is assembled and connected to the rotation limit assembly, and clamping fixings are symmetrically arranged on the inner wall of the supporting bracket, a connecting shaft is rotatably arranged on the furnace door, one end of the connecting shaft is assembled and fixed to the fixed shaft, and the exposed end of the connecting shaft is connected to a driving assembly.

2. The hot end sintering furnace of silicon carbide electric heating element according to claim 1, characterized in that: The rotation limiting assembly includes a threaded sleeve, a limiting bolt and an optical axis. The threaded sleeve is embedded in the annular bracket, the limiting bolt is screwed into the threaded sleeve, and the optical axis is welded to one end of the limiting thread and rotates with the supporting bracket.

3. The hot end sintering furnace of silicon carbide electric heating element according to claim 1, characterized in that: The clamping fixing member includes an L-shaped support rod, an arc-shaped support plate and a buckle plate. The L-shaped support rod is symmetrically arranged on the lower end surface of the support bracket, the arc-shaped support plate is installed on one end of the L-shaped support rod, and the buckle plate is slidably mounted on the arc-shaped support plate.

4. The hot end sintering furnace of silicon carbide electric heating element according to claim 3, characterized in that: The arc-shaped support plate is symmetrically provided with hemispherical grooves on both sides, and a strip-shaped shallow groove is provided on one side of the hemispherical groove. The depth of the strip-shaped shallow groove is smaller than the radius of the hemispherical groove. A hemispherical protrusion is provided on the inner wall surface of the buckle plate, and the hemispherical protrusion is slidably matched with the strip-shaped shallow groove.

5. The hot end sintering furnace of silicon carbide electric heating element according to claim 1, characterized in that: The driving assembly includes a driving motor, a reducer, a transmission shaft and a water-cooling component. The driving motor is arranged on the outside of the furnace door. The input end of the reducer is connected to the output end of the driving motor. One end of the transmission shaft is connected to the output end of the reducer, and the other end is connected to the connecting shaft. The water-cooling component is sleeved on the outside of the transmission shaft and is rotatably sealed with the transmission shaft. Annular heat dissipation fins are evenly welded on the transmission shaft.

6. A hot end sintering furnace for silicon carbide electric heating elements according to claim 5, characterized in that: The water-cooling component comprises a heat exchange silo and a water chiller. The heat exchange silo is sleeved on the outside of the transmission shaft, and both ends of the inlet and outlet of the water chiller are respectively connected to the side walls of the heat exchange silo.

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