Graphite trepanning device
By designing a graphite nesting device including lifting motor, drill rod assembly and clamping motor, the existing devices cannot adapt to graphite crucibles of different diameters and cannot assist in fixing, the accuracy and stability of blind hole opening are achieved, and the processing effect is improved.
Patent Information
- Application Number
- CN202421427818.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-06-21
AI Technical Summary
When fixing the graphite crucible, the existing graphite nesting device has a fixed diameter and cannot adapt to graphite crucibles of different diameters. It cannot assist in fixing during cutting, resulting in the possibility of deviation of blind hole openings, affecting the processing effect.
A graphite nesting device is designed, including a workbench, nesting barrel, mounting side plate, open-hole plate and corresponding components. The position of the opening assembly is adjusted by lifting motor, lifting screw and limiting slide, and blind hole opening is achieved by using drill rod, shaft and helical gear; at the same time, the two sides of the graphite crucible are fixed by clamping motor, bidirectional screw and clamping plate.
This device can adapt to graphite crucibles of different diameters, ensure the accuracy and stability of blind hole opening, avoid the offset and vibration of graphite crucibles during processing, and improve the processing effect.
Smart Images

Figure CN223013556U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of graphite crucibles, and specifically relates to a graphite nesting device. Background Technique
[0002] The graphite crucible, also known as a copper melting ladle, copper melting pot, etc., is a crucible fired from graphite, clay, silica, and pyrophyllite. This crucible uses natural flake graphite as the main raw material and is processed with plastic refractory clay or carbonaceous material as the binder. During the production process of the graphite crucible, it is necessary to process blind holes at the bottom of the graphite crucible. A blind hole in a graphite crucible refers to a hole that does not penetrate to the bottom of the crucible. The blind hole can be used to accommodate or fix specific substances or equipment to meet specific experimental or production requirements.
[0003] When opening a blind hole in a graphite crucible, it is generally sleeved on a nesting device, and the nesting device is used to fix and limit it, so as to avoid processing accidents during the opening of the blind hole and affecting the production and processing of the graphite crucible. However, in the existing graphite nesting device, when fixing, the nesting cylinder mostly has a fixed diameter. When processing graphite crucibles with different internal diameters, it cannot be adapted to them, resulting in a relatively limited scope of application. And during cutting, it is impossible to assist in fixing the graphite crucible, resulting in the possibility that the opening of the blind hole in the graphite crucible may be offset due to vibration, affecting the processing effect. In order to solve the above problems, while facilitating the opening of the blind hole at the bottom of the graphite crucible, increasing the processing and use range of the nesting device, and adding a fixing component to prevent the graphite crucible from shifting and vibrating during processing and affecting the processing effect, for this reason, we propose a graphite nesting device. Content of the Utility Model
[0004] (1) Technical Problems to be Solved
[0005] In view of the deficiencies of the prior art, the utility model provides a graphite nesting device, which solves the above problems.
[0006] (2) Technical Solutions
[0007] To achieve the above object, the utility model provides the following technical solutions: A graphite nesting device includes a workbench. Four end points at the bottom of the workbench are fixedly installed with columns for support. A nesting cylinder for placing the crucible is fixedly installed on the top of the workbench. Installation side plates for installation are fixedly installed on both sides of the top of the workbench corresponding to the position of the nesting cylinder. The tops of the installation side plates are fixedly installed at the bottom of an opening table plate. An opening component for opening holes is arranged on the top of the opening table plate. It also includes:
[0008] The nesting component is arranged inside the nesting cylinder and is used to support and limit the graphite crucible.
[0009] The fixing component is arranged on the inner wall surfaces of two groups of mounting side plates and is used to fix and clamp both sides of the graphite crucible.
[0010] Preferably, a lifting groove for lifting is formed at the top of the perforating platen corresponding to the position of the perforating component. A lifting motor is fixedly installed at the position of the perforating platen corresponding to the lifting groove. The output end of the lifting motor is fixedly installed with a lifting lead screw. An installation table for lifting is threadedly connected to the lifting lead screw, and the perforating component is arranged on the top of the installation table.
[0011] Preferably, a limiting sliding plate is fixedly installed at the bottom of the perforating platen corresponding to the position of the installation table. The limiting sliding plate penetrates through the installation table, and the installation table is slidably installed on the limiting sliding plate.
[0012] Preferably, the perforating component includes a drill rod, a shaft rod, and a helical gear. The drill rod is rotatably installed on the installation table. A shaft rod is fixedly installed on the back side of the drill rod. A helical gear for driving is fixedly installed on the shaft rod. A driving motor is fixedly installed on one side of the installation table corresponding to the helical gear. The output end of the driving motor is fixedly installed with another helical gear, and the two helical gears are meshed with each other.
[0013] Preferably, the nesting component includes a protruding groove, a groove plate, an extension rod, and an ejecting component. A plurality of protruding grooves are equidistantly formed on the outer wall surface of the nesting cylinder. Groove plates that fit with the protruding grooves are arranged inside the protruding grooves. Extension rods are fixedly installed on the back sides of the groove plates. Ejecting components for driving them to eject are arranged at the positions corresponding to the plurality of extension rods inside the nesting cylinder.
[0014] Preferably, the ejecting component includes an installation frame, a driving lead screw, an ejecting cone block, and a sliding plate. An installation frame for installation is fixedly installed at the bottom of the workbench corresponding to the position of the nesting cylinder. A driving lead screw is rotatably installed on the installation frame. The bottom of the driving lead screw penetrates through the installation frame and is fixedly connected to the output end of the ejecting motor. An ejecting cone block is threadedly connected to the driving lead screw. A sliding plate is fixedly installed at the bottom of the ejecting cone block, and both sides of the sliding plate are slidably installed on the inner wall surface of the installation frame.
[0015] Preferably, reset plates are fixedly installed on both sides of the groove plate. Reset springs are fixedly installed on one side of the reset plates, and the other ends of the reset springs are fixedly installed on the inner wall surface of the nesting cylinder.
[0016] Preferably, the fixing assembly includes a sliding rod, a clamping plate, a bidirectional lead screw, a fixing groove and an auxiliary fixing frame. Clamping plates for clamping are slidably mounted on both sides of the mounting side plates. The clamping plates are in a Z shape as a whole. A sliding rod is fixedly mounted on one side of the clamping plates corresponding to the two mounting side plates. A bidirectional lead screw is rotatably mounted on the other side of the clamping plates corresponding to the two mounting side plates. The two clamping plates are both threadedly connected to the bidirectional lead screw. One end of the bidirectional lead screw penetrates through the mounting side plate and is fixedly connected to the output end of the clamping motor. Fixing grooves for clamping and fixing are provided at both ends of the clamping plates corresponding to the positions of the graphite crucible. Auxiliary fixing frames corresponding to the fixing grooves are fixedly mounted at the bottoms of the clamping plates.
[0017] (III) Beneficial effects
[0018] Compared with the prior art, the present utility model provides a graphite nesting device, which has the following beneficial effects:
[0019] 1. When the blind hole needs to be opened at the bottom of the graphite crucible of this graphite nesting device, the lifting motor can be started. The lifting motor drives the lifting lead screw to rotate. Through the cooperation of the lifting lead screw and the mounting table, the mounting table is driven to rise and fall on the lifting lead screw as the lifting lead screw rotates. The mounting table is limited by the limiting sliding plate. Then, by lowering the mounting table, the position of the hole-opening assembly is adjusted, so as to facilitate the processing and use during the opening of the blind hole.
[0020] 2. With the setting of the hole-opening assembly of this graphite nesting device, after the mounting table is lowered to a suitable height by the lifting lead screw, the driving motor can be started. The driving motor drives the helical gear fixedly connected to its output end to rotate. Then, through the meshing between the two helical gears, the shaft rod is driven to rotate, so as to drive the drill rod fixedly mounted at the bottom of the shaft rod to rotate, and the blind hole is opened at the bottom of the graphite crucible, which is more convenient and fast to use.
[0021] 3. With the setting of the fixing assembly of this graphite nesting device, during use, the clamping motor is started. The clamping motor drives the bidirectional lead screw to rotate. Through the threaded connection between the bidirectional lead screw and the two clamping plates, the two clamping plates on both sides are driven to contract synchronously towards the inside. Thus, through the fixing grooves opened at the ends of the clamping plates and the auxiliary fixing frames fixedly mounted at the bottoms of the clamping plates, the two sides of the graphite crucible are clamped and fixed, which is convenient for fixing the graphite crucible during use and convenient for the use of the graphite crucible during blind hole processing. Description of the drawings
[0022] Figure 1 It is a schematic diagram of the overall structure of the present utility model;
[0023] Figure 2Schematic diagram of the opening component structure of the present utility model;
[0024] Figure 3 Schematic diagram of the nesting component structure of the present utility model;
[0025] Figure 4 Schematic diagram of the fixing component structure of the present utility model.
[0026] In the figure: 1, workbench; 2, nesting cylinder; 3, installation side plate; 4, opening table board; 5, opening component; 6, lifting groove; 7, lifting lead screw; 8, installation table; 9, limit sliding plate; 10, drill rod; 11, shaft rod; 12, helical gear; 13, extending groove; 14, groove plate; 15, extension rod; 16, ejecting component; 17, installation frame; 18, driving lead screw; 19, ejecting cone block; 20, sliding plate; 21, sliding rod; 22, clamping plate; 23, bidirectional lead screw; 24, fixing groove; 25, auxiliary fixing frame; 26, reset plate; 27, reset spring. Specific embodiments
[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0028] Please refer to Figures 1-4 , a graphite nesting device, including a workbench 1. Columns for support are fixedly installed at the four end points of the bottom of the workbench 1. A nesting cylinder 2 for placing a crucible is fixedly installed at the top of the workbench 1. Installation side plates 3 for installation are fixedly installed at the corresponding positions on both sides of the top of the workbench 1. The tops of the installation side plates 3 are fixedly installed at the bottom of the opening table board 4. An opening component 5 for opening holes is arranged at the top of the opening table board 4. It further includes:
[0029] A nesting component, which is arranged inside the nesting cylinder 2 and is used for supporting and limiting the graphite crucible;
[0030] A fixing component, which is arranged on the inner wall surfaces of the two installation side plates 3 and is used for fixing and clamping both sides of the graphite crucible.
[0031] Furthermore, a lifting groove 6 for lifting is provided at the top of the perforating table board 4 corresponding to the position of the perforating assembly 5. A lifting motor is fixedly installed at the position of the perforating table board 4 corresponding to the lifting groove 6. The output end of the lifting motor is fixedly installed with a lifting lead screw 7. A mounting table 8 for lifting is threadedly connected to the lifting lead screw 7. The perforating assembly 5 is arranged on the top of the mounting table 8.
[0032] Furthermore, a limiting sliding plate 9 is fixedly installed at the bottom of the perforating table board 4 corresponding to the position of the mounting table 8. The limiting sliding plate 9 penetrates through the mounting table 8, and the mounting table 8 is slidably installed on the limiting sliding plate 9. When it is necessary to open a blind hole at the bottom of the graphite crucible, the lifting motor can be started, and the lifting lead screw 7 is driven to rotate by the lifting motor. Through the cooperation of the lifting lead screw 7 and the mounting table 8, the mounting table 8 is driven to rise and fall on the lifting lead screw 7 as the lifting lead screw 7 rotates. The mounting table 8 is limited by the limiting sliding plate 9. Then, by lowering the mounting table 8, the position of the perforating assembly 5 is adjusted, so as to facilitate the processing and use during the opening of the blind hole.
[0033] Furthermore, the perforating assembly 5 includes a drill rod 10, a shaft rod 11 and a bevel gear 12. The drill rod 10 is rotatably installed on the mounting table 8. A shaft rod 11 is fixedly installed on the back side of the drill rod 10. A bevel gear 12 for driving is fixedly installed on the shaft rod 11. A driving motor is fixedly installed on one side of the mounting table 8 corresponding to the bevel gear 12. The output end of the driving motor is fixedly installed on another bevel gear 12. The two bevel gears 12 are meshed with each other. Through the setting of the perforating assembly 5, after the mounting table 8 is lowered to a suitable height by the lifting lead screw 7, the driving motor can be started, and the bevel gear 12 fixedly connected to its output end is driven to rotate by the driving motor. Then, through the meshing between the two bevel gears 12, the shaft rod 11 is driven to rotate, so as to drive the drill rod 10 fixedly installed at the bottom of the shaft rod 11 to rotate, and a blind hole is opened at the bottom of the graphite crucible, which is more convenient and fast in use.
[0034] Furthermore, the nesting assembly includes a protruding groove 13, a groove plate 14, an extension rod 15 and an ejecting assembly 16. A plurality of protruding grooves 13 are equidistantly arranged on the outer wall surface of the nesting cylinder 2. Groove plates 14 that fit with the protruding grooves 13 are arranged inside the protruding grooves 13. Extension rods 15 are fixedly installed on the back sides of the groove plates 14. Ejecting assemblies 16 for driving them to eject are arranged at the positions of the nesting cylinder 2 corresponding to the plurality of extension rods 15.
[0035] Further, the ejection assembly 16 includes a mounting frame 17, a driving lead screw 18, an ejection cone block 19, and a sliding plate 20. A mounting frame 17 for installation is fixedly installed at the bottom of the workbench 1 corresponding to the position of the nesting cylinder 2. A driving lead screw 18 is rotatably installed on the mounting frame 17. The bottom of the driving lead screw 18 penetrates through the mounting frame 17 and is fixedly connected to the output end of the ejection motor. An ejection cone block 19 is threadedly connected to the driving lead screw 18. A sliding plate 20 is fixedly installed at the bottom of the ejection cone block 19. Both sides of the sliding plate 20 are slidably installed on the inner wall surface of the mounting frame 17.
[0036] Further, reset plates 26 are fixedly installed on both sides of the groove plate 14. One side of each reset plate 26 is fixedly installed with a reset spring 27. The other end of the reset spring 27 is fixedly installed on the inner wall surface of the nesting cylinder 2. Through the setting of the nesting assembly, when fixing the graphite crucible, first invert the graphite crucible so that the top of the graphite crucible faces upward. Then, by starting the ejection motor, the driving lead screw 18 is driven to rotate through the connection between the ejection motor and the driving lead screw 18. Due to the setting of the sliding plate 20 threadedly connected to the driving lead screw 18 and the ejection cone block 19, the ejection cone block 19 is driven to slide upward inside the mounting frame 17 as the driving lead screw 18 rotates. Then, the top of the ejection cone block 19 will gradually press against the extension rod 15 fixedly installed inside the groove plate 14. Through the taper change on the surface of the ejection cone block 19, the groove plate 14 is extruded from the inside of the protruding groove 13 to squeeze and fix the inner wall surface of the graphite crucible, limit it. And when extruding the groove plate 14, the reset springs 27 fixedly installed on the back sides of the reset plates 26 will also be squeezed by the reset plates 26 fixedly installed on both sides of the groove plate 14. After the clamping is completed and waiting for the graphite crucible to be processed, the ejection motor can be started to drive the driving lead screw 18 to rotate in the reverse direction, thereby driving the ejection cone block 19 and the sliding plate 20 to descend as the driving lead screw 18 rotates, releasing the extrusion on the extension rod 15, and through the rebound of the reset spring 27, the reset plate 26 is ejected, thereby driving the groove plate 14 to reset, which is more convenient for use when clamping the graphite crucible.
[0037] Further, the fixing component includes a sliding rod 21, a clamping plate 22, a bidirectional lead screw 23, a fixing groove 24 and an auxiliary fixing bracket 25. Clamping plates 22 for clamping are slidably installed on both sides of the mounting side plates 3. The clamping plates 22 are integrally Z-shaped. A sliding rod 21 is fixedly installed on one side of the clamping plates 22 corresponding to the two mounting side plates 3. A bidirectional lead screw 23 is rotatably installed on the other side of the clamping plates 22 corresponding to the two mounting side plates 3. Both clamping plates 22 are threadedly connected to the bidirectional lead screw 23. One end of the bidirectional lead screw 23 penetrates through the mounting side plate 3 and is fixedly connected to the output end of the clamping motor. Fixing grooves 24 for clamping and fixing are provided at both ends of the clamping plates 22 corresponding to the positions of the graphite crucible. Auxiliary fixing brackets 25 corresponding to the fixing grooves 24 are fixedly installed at the bottoms of the clamping plates 22. Through the setting of the fixing component, during use, by starting the clamping motor, the bidirectional lead screw 23 is driven to rotate by the clamping motor, and through the threaded connection between the bidirectional lead screw 23 and the two clamping plates 22, the two clamping plates 22 on both sides are driven to contract synchronously towards the inside. Thus, through the fixing grooves 24 provided at the ends of the clamping plates 22 and the auxiliary fixing brackets 25 fixedly installed at the bottoms of the clamping plates 22, both sides of the graphite crucible are clamped and fixed, which is convenient for fixing the graphite crucible during use and convenient for the use of the graphite crucible during blind hole machining.
[0038] Instructions for Use
[0039] In use, first invert the graphite crucible with its top facing upward. Then, start the ejector motor, which drives the driving lead screw 18 to rotate through the connection between the ejector motor and the driving lead screw 18. Due to the arrangement of the sliding plate 20 threadedly connected to the driving lead screw 18 and the ejector cone 19, the ejector cone 19 slides upward inside the mounting frame 17 as the driving lead screw 18 rotates. Subsequently, the top of the ejector cone 19 gradually presses against the extension rod 15 fixedly installed inside the groove plate 14. Through the taper change on the surface of the ejector cone 19, the groove plate 14 is extruded from the inside of the protruding groove 13 to squeeze and fix the inner wall surface of the graphite crucible, limiting it, thereby completing the nesting and fixing. Then, start the clamping motor, which drives the bidirectional lead screw 23 to rotate. Through the threaded connection between the bidirectional lead screw 23 and the two clamping plates 22, the two clamping plates 22 are driven to contract synchronously inward. Thus, through the fixing groove 24 opened at the end of the clamping plate 22 and the auxiliary fixing frame 25 fixedly installed at the bottom of the clamping plate 22, the two sides of the graphite crucible are clamped and fixed. After that, start the lifting motor, which drives the lifting lead screw 7 to rotate. Through the cooperation between the lifting lead screw 7 and the mounting table 8, the mounting table 8 rises and falls on the lifting lead screw 7 as the lifting lead screw 7 rotates, and the mounting table 8 is limited by the limiting sliding plate 9. After the mounting table 8 is lowered to an appropriate height by the lifting lead screw 7, the driving motor can be started, which drives the helical gear 12 fixedly connected to its output end to rotate. Subsequently, through the meshing between the two helical gears 12, the shaft rod 11 is driven to rotate, thereby driving the drill rod 10 fixedly installed at the bottom of the shaft rod 11 to rotate to open a blind hole at the bottom of the graphite crucible. After that, the processed graphite crucible can be taken off from several components by starting the clamping motor, which drives the bidirectional lead screw 23 to rotate. Through the threaded connection between the bidirectional lead screw 23 and the two clamping plates 22, the two clamping plates 22 are driven to contract synchronously inward. Thus, through the fixing groove 24 opened at the end of the clamping plate 22 and the auxiliary fixing frame 25 fixedly installed at the bottom of the clamping plate 22, the two sides of the graphite crucible are clamped and fixed. With the mutual cooperation of the above structures, this device is convenient for opening the blind hole at the bottom of the graphite crucible, increases the processing and usage range of the nesting device, and adds a fixing component to prevent the graphite crucible from shifting and vibrating during processing, affecting the processing effect, making it more practical.
[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A graphite casing device, comprising a workbench (1), wherein four ends of the bottom of the workbench (1) are fixedly mounted with columns for support, a casing barrel (2) for placing a crucible is fixedly mounted on the top of the workbench (1), mounting side plates (3) for mounting are fixedly mounted at positions corresponding to the casing barrel (2) on both sides of the top of the workbench (1), the tops of the mounting side plates (3) are fixedly mounted on the bottom of a perforated platen (4), and a perforated assembly (5) for perforating is arranged on the top of the perforated platen (4), characterized in that: Also includes: A casing assembly, the casing assembly being arranged inside the casing barrel (2), and being used for supporting and limiting the graphite crucible; A fixing assembly is arranged on the inner wall surfaces of the two sets of mounting side plates (3), and is used to fix and clamp the two sides of the graphite crucible.
2. A graphite sleeve device according to claim 1, characterized in that: A lifting slot (6) for lifting is provided at a position on the top of the hole-opening platen (4) corresponding to the hole-opening component (5); a lifting motor is fixedly installed at a position on the hole-opening platen (4) corresponding to the lifting slot (6); a lifting screw rod (7) is fixedly installed at the output end of the lifting motor; a mounting platform (8) for lifting is threadedly connected to the lifting screw rod (7); and the hole-opening component (5) is arranged on the top of the mounting platform (8).
3. A graphite sleeve device according to claim 2, characterized in that: A limiting slide plate (9) is fixedly installed at a position of the bottom of the perforated table (4) corresponding to the mounting platform (8); the limiting slide plate (9) passes through the mounting platform (8); and the mounting platform (8) is slidably installed on the limiting slide plate (9).
4. A graphite sleeve device according to claim 2, characterized in that: The hole opening assembly (5) comprises a drill rod (10), a shaft rod (11) and a bevel gear (12); the drill rod (10) is rotatably mounted on a mounting platform (8); the shaft rod (11) is fixedly mounted on the back side of the drill rod (10); a bevel gear (12) for driving is fixedly mounted on the shaft rod (11); a driving motor is fixedly mounted on one side of the bevel gear (12) corresponding to the top of the mounting platform (8); an output end of the driving motor is fixedly mounted on another bevel gear (12); and the two sets of bevel gears (12) are meshed with each other.
5. A graphite sleeve device according to claim 1, characterized in that: The sleeve assembly comprises a protruding groove (13), a groove plate (14), an extension rod (15) and an ejection assembly (16); a plurality of protruding grooves (13) are equidistantly provided on the outer wall surface of the sleeve barrel (2); a groove plate (14) matching the protruding grooves (13) is provided inside each of the protruding grooves (13); an extension rod (15) is fixedly installed on the back side of each of the groove plates (14); and an ejection assembly (16) for driving the ejection of the extension rods (15) is provided inside the sleeve barrel (2) at positions corresponding to the plurality of extension rods (15).
6. A graphite sleeve device according to claim 5, characterized in that: The ejection assembly (16) comprises a mounting frame (17), a driving screw (18), an ejection cone block (19) and a sliding plate (20); a mounting frame (17) for mounting is fixedly mounted at a position corresponding to the sleeve barrel (2) at the bottom of the workbench (1); a driving screw (18) is rotatably mounted on the mounting frame (17); the bottom of the driving screw (18) passes through the mounting frame (17) and is fixedly connected to the output end of the ejection motor; an ejection cone block (19) is threadedly connected to the driving screw (18); a sliding plate (20) is fixedly mounted at the bottom of the ejection cone block (19); both sides of the sliding plate (20) are slidably mounted on the inner wall surface of the mounting frame (17).
7. A graphite sleeve device according to claim 5, characterized in that: A reset plate (26) is fixedly mounted on both sides of the groove plate (14), a reset spring (27) is fixedly mounted on one side of the reset plate (26), and the other end of the reset spring (27) is fixedly mounted on the inner wall surface of the sleeve barrel (2).
8. A graphite sleeve device according to claim 1, characterized in that: The fixing assembly comprises a slide bar (21), a clamping plate (22), a bidirectional screw rod (23), a fixing groove (24) and an auxiliary fixing frame (25). The clamping plates (22) for clamping are slidably installed on the mounting side plates (3) on both sides. The clamping plates (22) are in a Z shape as a whole. The slide bar (21) is fixedly installed on one side of the clamping plate (22) between the two groups of mounting side plates (3). The slide bar (21) is fixedly installed on the other side of the clamping plate (22) between the two groups of mounting side plates (3). A bidirectional screw rod (23) is installed, and the two groups of clamping plates (22) are both threadedly connected to the bidirectional screw rod (23). One end of the bidirectional screw rod (23) passes through the mounting side plate (3) and is fixedly connected to the output end of the clamping motor. Fixed grooves (24) for clamping and fixing are provided at positions corresponding to the graphite crucible at both ends of the clamping plate (22), and an auxiliary fixing frame (25) corresponding to the fixing groove (24) is fixedly installed at the bottom of the clamping plate (22).