Graphite crucible forming device and graphite crucible preparation method

Abstract

Embodiments of the present invention provide a graphite crucible forming device and a graphite crucible preparation method. The graphite crucible forming device comprises: a supporting frame comprising a base; a male die arranged on the supporting frame and away from the base, wherein the male die can reciprocate relative to the supporting frame in a vertical direction; a crucible mouth pressing apparatus arranged on the supporting frame and correspondingly arranged on the side of the male die close to the base, wherein the crucible mouth pressing apparatus can reciprocate relative to the supporting frame in the vertical direction, and is provided with an opening part used for allowing the male die to pass through; and a female die arranged on the base and corresponding to the male die, wherein the female die is used for containing crucible paste, and the male die, the crucible mouth pressing apparatus and the female die work in conjunction to make the crucible paste form a crucible. The graphite crucible forming device according to the embodiments can effectively increase the density of graphite crucibles, and ensure density uniformity, thereby prolonging the service life of graphite crucibles.

Description

Graphite crucible forming equipment and graphite crucible preparation method Technical Field

[0001] The present invention relates to the technical field of graphite products, especially graphite crucible preparation, and in particular to graphite crucible forming equipment and a graphite crucible preparation method. Background Art

[0002] With the widespread adoption of lithium-ion batteries in electric vehicles and energy storage, the lithium battery industry continues to grow rapidly, placing higher demands on the cost and performance of negative electrode materials. Therefore, further reducing the manufacturing cost of negative electrode materials is a key area of ​​continuous improvement for the graphitization industry as it adapts to the development of the lithium-ion battery industry. Acheson graphitization furnaces, with their strong product adaptability, mature process, and high safety, are widely used in the graphitization of graphite negative electrode materials for lithium-ion batteries.

[0003] As one of the main consumables of the Acheson graphitization furnace, the number of times the graphite crucible is recycled plays a vital role in reducing the graphitization cost of graphite negative electrode materials for lithium-ion batteries. This is especially true as the capacity of Acheson graphitization furnaces has increased significantly to 150-200 tons per furnace and the energy consumption per unit product has dropped significantly. Taking a graphite crucible with a loading capacity of 200 kg per crucible as an example, the unit price is 2,000 yuan per crucible. Five crucibles are required to load one ton. The average recycling rate of mainstream products on the market is about 4 times. Therefore, about 1.25 crucibles are consumed per ton of negative electrode material, and the crucible cost per ton of negative electrode material is about 2,500 yuan. If the number of times the graphite crucible can be recycled can be increased to 6 times, the crucible cost per ton of negative electrode material will be about 1,667 yuan, and the cost per ton of negative electrode material can be saved by 833 yuan.

[0004] In the prior art graphite crucible forming machine and its forming process, when forming the crucible, the crucible paste is subjected to the pressure of the punch and freely turns upward along the gap between the punch and the die until the main cylinder moves to the set displacement. Since the paste is in a disordered and free upward turning state during the turning process, there is no pressure on the paste, resulting in a low overall density of the crucible. The density of the crucible decreases from bottom to top. For example, the density at the bottom of the crucible is 1.72g / cm 3 Gradually reduce the density at the crucible mouth to 1.68g / cm 3Below. Due to the low and uneven overall density of the crucible, its strength and oxidation resistance are poor, resulting in a short service life of the crucible. In addition, due to the low density of the crucible mouth, cracks are likely to occur from the crucible mouth during use and gradually extend to the bottom of the crucible, causing damage to the crucible. The current service life of mainstream products on the market is about 3 to 4 times. At the same time, in order to meet the demand for cost reduction, the filling volume of graphitization is getting larger and larger, and the effective volume of the crucible needs to be increased as much as possible, resulting in the crucible diameter becoming larger and larger, the height becoming higher and higher, and the wall thickness becoming thinner and thinner, which will lead to a sharp decrease in the quality of the upper part of the crucible. In order to ensure the yield and service life of the crucible, the process difficulty is increasing, which hinders the improvement of the quality and life of the crucible.

[0005] The main forms of damage to mainstream graphite crucibles in the market during use include: 1) cracks at the top end (i.e., the crucible mouth) extending all the way to the bottom of the crucible; 2) uneven oxidation of the crucible body; and 3) preferential corrosion at the crucible mouth. These various types of damage to graphite crucibles during use result in a short service life for existing graphite crucibles.

[0006] Therefore, there is an urgent need for a graphite crucible forming device to prepare the graphite crucible to improve the service life of the graphite crucible. Technical issues

[0007] Therefore, in order to overcome at least some of the defects and shortcomings in the prior art, embodiments of the present invention provide a graphite crucible forming device and a graphite crucible preparation method to increase the service life of the graphite crucible. Technical Solutions

[0008] Specifically, on the one hand, the graphite crucible forming equipment provided by an embodiment of the present invention includes: a support frame, the support frame includes a base; a punch, which is arranged on the support frame away from the base, and the punch can reciprocate in a vertical direction relative to the support frame; a crucible pressing mouth device, which is arranged on the support frame and correspondingly arranged on a side of the punch close to the base, the crucible pressing mouth device can reciprocate in a vertical direction relative to the support frame, and the crucible pressing mouth device is provided with an opening for the punch to pass through; and a die, which is arranged on the base and corresponding to the die, the die is used to accommodate crucible paste, and the die, the crucible pressing mouth device and the die cooperate to form the crucible paste into a crucible.

[0009] In a specific embodiment of the present invention, the crucible pressing mouth device is an annular structure, the outer diameter of the crucible pressing mouth device is smaller than the inner diameter of the die, and the inner diameter of the crucible pressing mouth device is larger than the outer diameter of the punch.

[0010] In a specific embodiment of the present invention, the punch is a columnar structure, the die is provided with a paste receiving groove, the paste receiving groove is a columnar structure matching the punch, the outer diameter of the punch is smaller than the inner diameter of the paste receiving groove, and the ring width W1 of the crucible pressing mouth device is W1 = (D1-D2) ÷ 2, wherein W1 is the ring width of the crucible pressing mouth device, D1 is the inner diameter of the paste receiving groove, and D2 is the outer diameter of the punch.

[0011] In a specific embodiment of the present invention, the crucible pressing mouth device includes a cylinder and a limiting portion connected to the cylinder, the opening portion is arranged on the cylinder, and when the crucible pressing mouth device moves toward the die to a preset height, the limiting portion abuts against the die.

[0012] In a specific embodiment of the present invention, the support frame also includes a column; the graphite crucible forming equipment also includes: a first driving assembly, including a first hydraulic cylinder and a first sliding beam, the first hydraulic cylinder is arranged on the support frame, the first hydraulic cylinder is connected to the first sliding beam, the first sliding beam is slidably connected to the column, the punch is fixedly connected to the side of the first sliding beam close to the base, and the first hydraulic cylinder is used to drive the first sliding beam to reciprocate in the vertical direction; and a second driving assembly, including a second hydraulic cylinder and a second sliding beam, the second hydraulic cylinder is arranged on the support frame, the second hydraulic cylinder is connected to the second sliding beam, the second sliding beam is arranged on the side of the first sliding beam close to the base, and the second sliding beam is slidably connected to the column, the crucible pressing mouth device is fixedly connected to the side of the second sliding beam close to the base, and the second hydraulic cylinder is used to drive the second sliding beam to reciprocate in the vertical direction.

[0013] In a specific embodiment of the present invention, the second sliding beam is provided with a punch avoidance hole, the punch avoidance hole is arranged corresponding to the punch, and the crucible pressing mouth device is arranged on a side of the second sliding beam close to the base corresponding to the punch avoidance hole.

[0014] In a specific embodiment of the present invention, the second hydraulic cylinders include two, the two second hydraulic cylinders are symmetrically arranged on both sides of the first hydraulic cylinder, and the two second hydraulic cylinders are respectively connected to the two ends of the second sliding beam through piston rods.

[0015] In a specific embodiment of the present invention, the first sliding beam and the second sliding beam are both provided with connecting through holes, the connecting through holes are sleeved on the column, and the first sliding beam and the second sliding beam are slidably connected to the column through the connecting through holes.

[0016] In a specific embodiment of the present invention, a guide sleeve adapted to the column is provided in the connecting through hole, a lubrication groove is provided on the inner side wall of the guide sleeve, and a dust ring is provided in the lubrication groove.

[0017] In a specific embodiment of the present invention, the graphite crucible forming equipment also includes: a first displacement controller, arranged on the first sliding beam, for controlling the moving distance of the punch; a second displacement controller, arranged on the second sliding beam, for controlling the moving distance of the crucible pressing device.

[0018] In a specific embodiment of the present invention, the second displacement controller is further used to detect the movement distance of the crucible pressing device when it is pressed by the crucible paste toward the side away from the base, so as to detect the performance of the crucible paste.

[0019] In a specific embodiment of the present invention, the number of the concave mold is at least one; the graphite crucible forming equipment also includes: a movable platform, slidably connected to the base, at least one convex mold is arranged on the movable platform, and the movable platform can drive the convex mold to move back and forth relative to the base.

[0020] On the other hand, an embodiment of the present invention also provides a method for preparing a graphite crucible, comprising: adding a set weight of crucible paste into a die; moving a punch and a crucible pressing device in a vertical direction to the die to extrude the crucible paste to form the crucible; and moving the punch and the crucible pressing device in a vertical direction toward a side away from the die for demolding.

[0021] In a specific embodiment of the present invention, the punch and the crucible pressing device move in a vertical direction to the die to extrude the crucible paste to form the crucible, specifically comprising: the punch and the crucible pressing device synchronously move toward the die to press the crucible paste, so that the crucible paste is constantly pressed for a preset period of time; the punch continues to move toward the side close to the base, and the crucible pressing device synchronously moves toward the side away from the base to form the crucible.

[0022] In a specific embodiment of the present invention, the punch and the crucible pressing device move synchronously toward the die to press the crucible paste, so that the crucible paste is constantly pressurized for a preset period of time, specifically comprising: the punch and the crucible pressing device move synchronously toward the die to contact the crucible paste; the punch and the crucible pressing device continue to move synchronously toward the side close to the base and gradually increase the pressure to a set pressure; the punch and the crucible pressing device maintain the set pressure for the preset period of time, so that the crucible paste is constantly pressurized.

[0023] In a specific embodiment of the present invention, the punch continues to move toward the side close to the base, and the crucible pressing device simultaneously moves toward the side away from the base, so as to form the crucible, specifically comprising: the punch gradually increases pressure and moves toward the side close to the base to a first limited position, the first limited position being used to limit the thickness of the bottom of the crucible; the crucible pressing device gradually reduces pressure and simultaneously moves toward the side away from the base to a second limited position, the second limited position being higher than the standard height of the crucible.

[0024] In a specific embodiment of the present invention, the punch continues to move toward the side close to the base, and the crucible mouth device simultaneously moves toward the side away from the base to form the crucible. Thereafter, the punch maintains its position unchanged, and the crucible mouth device increases pressure and slowly moves down to a third defined position, wherein the third defined position is used to define a standard height of the crucible; and the punch and the crucible mouth device maintain pressure for a set period of time to form the crucible mouth.

[0025] In a specific embodiment of the present invention, the punch and the crucible mouth device move in a vertical direction toward the side away from the die to perform demolding, which specifically includes: the punch and the crucible mouth device synchronously relieve pressure; the crucible mouth device maintains its position, and the punch moves to an initial position toward the side away from the die; and the crucible mouth device moves to an initial position toward the side away from the die.

[0026] In a specific embodiment of the present invention, after the male mold and the crucible pressing device are moved in a vertical direction toward a side away from the female mold for demoulding, the method further includes: injecting 50% to 90% of the crucible volume of a cooling liquid into the formed crucible.

[0027] On the other hand, an embodiment of the present invention further provides a graphite crucible forming device, comprising: a support frame; a die, connected to the support frame, the die being provided with a paste receiving groove for receiving crucible paste; a punch, connected to the support frame and arranged corresponding to the paste receiving groove; a crucible pressing mouth device, connected to the support frame, the crucible pressing mouth device being provided with an opening portion, the opening portion corresponding to the punch and the paste receiving groove; wherein the punch and the crucible pressing mouth device are used to cooperate with each other to extrude the crucible paste in the paste receiving groove to form a crucible; in the process of forming the crucible, the crucible pressing mouth device can move back and forth relative to the support frame and enter and exit the paste receiving groove, and the punch can move back and forth relative to the support frame and enter and exit the paste receiving groove through the opening portion. Beneficial effects

[0028] As can be seen from the above, the embodiment of the present invention is to configure the graphite crucible forming equipment to include a support frame, a punch, a crucible pressure mouth device and a die, and the die is arranged on the base, the punch is arranged on the side of the support frame away from the base, the crucible pressure mouth device is arranged between the punch and the die, the punch can pass through the crucible pressure mouth device through the opening on the crucible pressure mouth device, and the die is used to accommodate the crucible paste. Through the cooperation of the punch, the crucible pressure mouth device and the die, the crucible paste is formed into a crucible. By setting the crucible pressure mouth device, the crucible pressure mouth device and the punch synchronously perform constant pressure forward extrusion on the crucible paste, which can effectively increase the density of the graphite crucible and ensure the uniformity of the density, thereby improving the strength and oxidation resistance of the graphite crucible. In addition, after the crucible is formed, the punch reduces the pressure and maintains the position unchanged, and the crucible pressure mouth device increases the pressure and slowly moves down to the standard height of the crucible and maintains the pressure, thereby achieving precise control of the crucible height and improving the crucible mouth density, thereby achieving precise control of the crucible size and a significant increase in the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] FIG1 is a schematic structural diagram of a graphite crucible forming device provided in an embodiment of the present invention.

[0031] FIG2 is another schematic structural diagram of the graphite crucible forming equipment provided by an embodiment of the present invention.

[0032] FIG3 is a schematic diagram of the cross-sectional structure of the punch in FIG1 .

[0033] FIG4 is a schematic cross-sectional view of the crucible mouth device in FIG1 .

[0034] FIG5 is a schematic diagram of the cross-sectional structure of the die in FIG1 .

[0035] FIG6 is a schematic structural diagram of the first sliding beam in FIG1 .

[0036] FIG7 is a schematic flow chart of a method for preparing a graphite crucible provided in an embodiment of the present invention.

[0037] FIG8 is a flow chart of step S20 in FIG7 .

[0038] FIG9 is a flow chart of step S21 in FIG8 .

[0039] FIG10 is a flow chart of step S22 in FIG8 .

[0040] FIG. 11 is another flow chart of step S20 in FIG. 7 .

[0041] FIG12 is a flow chart of step S30 in FIG7 .

[0042] 13A-13F are schematic diagrams of a graphite crucible preparation process according to an embodiment of the present invention.

[0043] Main component numbers:

[0044] 100. Graphite crucible forming equipment; 10. First drive assembly; 11. First hydraulic cylinder; 12. First sliding beam; 121. Connecting through hole; 122. First displacement controller; 13. Piston rod; 20. Second drive assembly; 21. Second hydraulic cylinder; 22. Second sliding beam; 222. Second displacement controller; 221. Punch avoidance hole; 23. Piston rod; 31. Punch; 32. Crucible pressing mouth device; 321. Cylinder; 322. Limiting portion; 323. Opening portion; 33. Die; 331. Paste containing groove; 332. Side wall top; 40. Support frame; 41. Base; 42. Column; 50. Moving platform; 60. Crucible paste. Best Mode for Carrying Out the Invention

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments described in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work shall fall within the scope of protection of the present invention.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back, top, and bottom) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the various components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the term "perpendicular" in the embodiments of the invention and the claims refers to the angle between two elements being 90° or a deviation of -5° to +5°, and the term "parallel" refers to the angle between two elements being 0° or a deviation of -5° to +5°.

[0047] In the embodiments of the present invention, references to "first," "second," and the like are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0048] 1 and 2 , a graphite crucible forming device 100 provided in an embodiment of the present invention may include, for example, a support frame 40 , a male mold 31 , a crucible opening pressing device 32 , and a female mold 33 .

[0049] Specifically, the support frame 40 can be, for example, a metal support frame, and the support frame 40 has good strength to provide stable support. The support frame 40 can, for example, include a base 41, which can, for example, be located at the bottom of the support frame 40. Referring to Figure 3, the punch 31 can, for example, be a columnar structure, and the shape of the punch 31 can, for example, match the inner wall of the crucible to be prepared. The punch 31 is disposed on the support frame 40, and can, for example, be disposed on a side of the support frame 40 away from the base 41, that is, the punch 31 is disposed on the upper portion of the support frame 40, and the punch 31 can reciprocate vertically relative to the support frame 40. The punch 31 can, for example, be a hollow structure or a solid structure, and this embodiment is not limited thereto. Referring to Figure 4, the crucible pressure mouth device 32 is disposed on the support frame 40, and the crucible pressure mouth device 32 is correspondingly disposed on the side of the punch 31 close to the base 41, that is, the crucible pressure mouth device 32 can, for example, be disposed between the punch 31 and the base 41. The crucible-pressing mouth device 32 can reciprocate vertically relative to the support frame 40. The crucible-pressing mouth device 32 can, for example, be a cylindrical structure, provided with an opening 323 for allowing the punch 31 to pass through. The opening 323 can, for example, be arranged in a vertical direction relative to the crucible-pressing mouth device 32, so that the crucible-pressing mouth device 32 forms a cylindrical structure. The die 33 is disposed on the base 41 and corresponds to the punch 31. The punch 31, the crucible-pressing mouth device 32, and the die 33 can, for example, be arranged on the same vertical line. That is, when the punch 31 and the crucible-pressing mouth device 32 move downward, the punch 31 can enter the die 33, and the crucible-pressing mouth device 32 can move between the punch 31 and the die 33. Referring to FIG. 5 , the inner wall of the die 33 can mate with the outer wall of the crucible. The die 33 can, for example, be provided with a paste receiving groove 331 for receiving the crucible paste 60. The punch 31, the crucible-pressing device 32, and the die 33 cooperate to form the crucible paste 60 into a crucible. The punch 31 and the crucible-pressing device 32 cooperate to squeeze the crucible paste 60 within the paste-receiving tank 331 to form the crucible. During the crucible formation process, the crucible-pressing device 32 can reciprocate relative to the support frame 40 and enter and exit the paste-receiving tank 331. The punch 31 can reciprocate relative to the support frame 40 and enter and exit the paste-receiving tank 331 through the opening 323.

[0050] The graphite crucible forming device 100 of this embodiment forms the crucible paste 60 into a crucible through the cooperation of the punch 31, the crucible mouth device 32 and the die 33. By setting the crucible mouth device 32, the crucible mouth device 32 and the punch 31 simultaneously perform constant pressure positive extrusion (from top to bottom) on the crucible paste 60, which can effectively increase the density of the graphite crucible and ensure the uniformity of the density, thereby improving the overall strength and oxidation resistance of the graphite crucible, and further improving the service life of the graphite crucible. In addition, in the process of using the graphite crucible forming device 100 to prepare the crucible, after the crucible is formed, the punch 31 reduces the pressure and maintains the position unchanged, and the crucible mouth device 32 increases the pressure and slowly moves down to the standard height of the crucible and maintains the pressure, thereby achieving precise control of the crucible height and increasing the crucible mouth density, so as to accurately control the crucible size and further improve the service life of the graphite crucible.

[0051] Furthermore, the crucible opening device 32 may, for example, be an annular structure, wherein the outer diameter d2 of the crucible opening device 32 is smaller than the inner diameter of the die 33, and the inner diameter d1 of the crucible opening device 32 is larger than the outer diameter D2 of the punch 31. Specifically, the punch 31 may, for example, be a cylindrical structure, and the paste receiving groove 331 may also, for example, be a cylindrical structure matching the punch 31. The outer diameter of the punch 31 is smaller than the inner diameter of the paste receiving groove 331, and the ring width (also referred to as the wall thickness) of the crucible opening device 32 is W1 = (D1 - D2) ÷ 2, where W1 is the ring width of the crucible opening device 32, D1 is the inner diameter of the paste receiving groove 331, and D2 is the outer diameter of the punch 31. The ring width of the crucible opening device 32 may, for example, be the same as the wall thickness of the crucible, or the ring width of the crucible opening device 32 may, for example, be the same as the wall thickness of the crucible.

[0052] Referring again to FIG. 4 , the crucible opening device 32 may, for example, include a barrel 321 and a limiting portion 322, wherein the limiting portion 322 is connected to the barrel 321. Specifically, the limiting portion 322 is connected to one end of the barrel 321. An opening 323 is provided on the barrel 321, and the limiting portion 322 may, for example, be disposed around the outside of the opening 323 of the barrel 321. The die 33 may, for example, have a sidewall, with the side of the sidewall proximal to the punch 31 being a sidewall top 332. When the crucible opening device 32 moves toward the die 33 to a predetermined height, the limiting portion 322 abuts against the concave diaphragm 33. Specifically, the limiting portion 322 abuts against the sidewall top 332, thereby limiting the height of the barrel 321 within the concave diaphragm 33. Furthermore, the width W2 of the limiting portion 322 may, for example, be greater than or equal to the thickness of the sidewall of the die 33. This allows for better positioning and improved stability.

[0053] The support frame 40 may, for example, further include a column 42, which may be, for example, a slender rod-shaped part, one end of which is connected to the base 41. The support frame 40 may, for example, include four columns 42, which may be assembled into the support frame 40, for example, by means of a crossbeam, a locking nut, etc. The graphite crucible forming apparatus 100 provided in this embodiment further includes a first drive assembly 10 and a second drive assembly 20. The first drive assembly 10 is connected to the punch 31, which may, for example, be disposed on the support frame 40 and may drive the punch 31 to slide up and down relative to the support frame 40. The second drive assembly 20 is connected to the crucible pressing mouth device 32, which may, for example, be disposed on the support frame 40 and may drive the crucible pressing mouth device 32 to slide up and down relative to the support frame 40.

[0054] Specifically, the first drive assembly 10 may, for example, include a first hydraulic cylinder 11 and a first sliding beam 12. The first hydraulic cylinder 11 may, for example, be an oil cylinder, or other hydraulic cylinders, and this embodiment is not limited thereto. The support frame 40 may, for example, also be provided with an upper crossbeam, which may, for example, be fixedly connected to the column 42. Specifically, the upper crossbeam is connected to the end of the column 42 away from the base. The first hydraulic cylinder 11 may, for example, be provided inside the upper crossbeam and fixed to the upper crossbeam via a flange. The first sliding beam 12 may, for example, be connected to the first hydraulic cylinder 11 via a piston rod 13 on the first hydraulic cylinder 11, and the piston rod 13 may, for example, be connected to the first sliding beam 12 via a connecting flange. The first sliding beam 12 may, for example, be slidably connected to the column 42, and the punch 31 may, for example, be fixedly connected to the side of the first sliding beam 12 close to the base 41. The first sliding beam 12 is guided by the column 42 and can move back and forth along the column 42. Referring to Figure 6, the first sliding beam 12 may be provided with a connecting through-hole 121, which is sleeved on the column 42. The first sliding beam 12 is slidably connected to the column 42 through the connecting through-hole 121. A guide sleeve adapted to the column 42 may be installed in the connecting through-hole 121 for guidance. The guide sleeve may be provided with a lubrication groove, for example. A lubricant such as grease may be placed in the lubrication groove, so that the first sliding beam 12 can move back and forth more smoothly in the vertical direction, i.e., slide up and down. The lubrication groove may also be provided with a dust ring, for example, to prevent dust from entering and avoid the sliding effect being affected by excessive dust. The first hydraulic cylinder 11 may, for example, drive the first sliding beam 12 to move back and forth in the vertical direction through the piston rod 13, thereby driving the punch 31 to move back and forth in the vertical direction through the movement of the first sliding beam 12.

[0055] The second drive assembly 20 may, for example, include a second hydraulic cylinder 21 and a second sliding beam 22. The second hydraulic cylinder 21 may, for example, be an oil cylinder, or other hydraulic cylinders, and this embodiment is not limited thereto. The second hydraulic cylinder 21 may, for example, be disposed within the upper crossbeam and secured thereto via a flange. The second sliding beam 22 may, for example, be connected to the second hydraulic cylinder 21 via a piston rod 23 on the second hydraulic cylinder 21. The piston rod 23 may, for example, be connected to the second sliding beam 22 via a connecting flange. The second sliding beam 22 may, for example, be slidably coupled to the column 42. The crucible pressing port device 32 may, for example, be fixedly coupled to a side of the second sliding beam 22 proximate to the base 41. The second sliding beam 22 is guided by the column 42 and can reciprocate along the column 42. The second sliding beam 22 may, for example, be provided with a connecting through-hole (not shown in the figure), which is sleeved on the column 42. The second sliding beam 22 is slidably connected to the column 42 through the connecting through-hole. A guide sleeve adapted to the column 42 may be installed in the connecting through-hole for guidance. The guide sleeve may, for example, be provided with a lubrication groove. The lubrication groove can prevent lubricants such as grease from entering, allowing the second sliding beam 22 to reciprocate more smoothly in the vertical direction, i.e., slide up and down. The lubrication groove may, for example, also be provided with a dust ring to prevent dust from entering, thereby avoiding the sliding effect being affected by excessive dust. The second hydraulic cylinder 21 may, for example, drive the second sliding beam 22 to reciprocate in the vertical direction through the piston rod 23, thereby driving the crucible pressing device 32 to reciprocate in the vertical direction through the movement of the second sliding beam 22.

[0056] Furthermore, the second hydraulic cylinders 21 may include two, for example, which may be symmetrically arranged on either side of the first hydraulic cylinder 11. The two second hydraulic cylinders 21 are respectively connected to the two ends of the second sliding beam 22 via piston rods 23. The provision of the two second hydraulic cylinders 21 can maintain a balanced movement of the second sliding beam 22, thereby making the movement more stable. Furthermore, the provision of the two second hydraulic cylinders 21 on either side of the first hydraulic cylinder 11, that is, the staggered arrangement of the first hydraulic cylinder 11 and the second hydraulic cylinder 21, can also make the structural layout more compact, improve driving efficiency, and save installation space.

[0057] Referring again to FIG. 2 , the second sliding beam 22 may, for example, further be provided with a punch avoidance hole 221. The punch avoidance hole 221 is provided corresponding to the punch 31, and the crucible pressing mouth device 32 is provided on the side of the second sliding beam 22 near the base 41, corresponding to the punch avoidance hole 221. The punch avoidance hole 221 may, for example, be provided on the second sliding beam 22, and the size of the punch avoidance hole 221 may match the size of the punch 31, that is, the inner diameter of the punch avoidance hole 221 is greater than or equal to the outer diameter of the punch 31, and the punch avoidance hole 221 matches the opening 323 on the crucible pressing mouth device 32, so that the punch avoidance hole 221 allows the punch 31 to pass through. During the crucible preparation process, the punch 31 may sequentially pass through the punch avoidance hole 221 and the opening 323 into the die 33 to prepare the crucible.

[0058] In one implementation of this embodiment, the graphite crucible forming apparatus 100 may, for example, further include a first displacement controller 122 and a second displacement controller 222. The first displacement controller 122 and the second displacement controller 222 may, for example, employ linear displacement sensors and may, for example, be provided with upper and lower limit travel switches. The first displacement controller 122 may, for example, be provided on the first sliding beam 12, and the first displacement controller 122 is used to control the movement distance of the punch 31. By providing the first displacement controller 122, the movement distance of the punch 31 can be precisely controlled to precisely control the bottom thickness of the crucible. The second displacement controller 222 is provided on the second sliding beam 22, and the second displacement controller 222 is used to control the movement distance of the crucible pressing mouth device 32. By providing the second displacement controller 222, the movement distance of the crucible pressing mouth device 32 can be precisely controlled to precisely control the height of the crucible.

[0059] Furthermore, the second displacement controller 222 can also be used, for example, to detect the distance the crucible mouth device 32 moves when it is squeezed by the crucible paste 60 toward the side away from the base 41. During the process of preparing a crucible using the graphite crucible forming equipment 100, the crucible paste 60 will press the crucible mouth device 32 upward under the pressure of the punch 31, and the crucible mouth device 32 will be squeezed toward the side away from the base 41. The second displacement controller 222 can detect the movement distance of the crucible mouth device 32. The characterization of the performance of the crucible paste has always been a difficult problem that has plagued the carbon industry. It plays a vital role in the performance and stability of carbon products. The performance of the paste is closely related to its formula, particle size distribution, and temperature. It is usually judged by the experience of technicians and cannot be quantitatively characterized. The movement distance of the crucible mouth device 32 can reflect the performance of the crucible paste 60. The greater the movement distance, the better the plasticity of the crucible paste 60.

[0060] In one embodiment of the present invention, the graphite crucible forming apparatus 100 may further include a movable platform 50. The die 33 may be disposed on the movable platform 50, and the number of die 33 may be two or more. The movable platform 50 may be a bidirectional movable workbench, for example, fixed to the base 41. The movable platform 50 may be provided with two or more workstations, and the die 33 may be disposed at the same number of workstations. The movable platform 50 may be capable of moving the die 33 to a position corresponding to the punch 31, or to another position. The provision of the movable platform 50 facilitates the movement and ejection of the prepared graphite crucible.

[0061] 7 , an embodiment of the present invention further provides a method for preparing a graphite crucible, comprising the following steps:

[0062] S10, adding a set weight of crucible paste into the concave mold;

[0063] S20, the male mold and the crucible pressing device are moved vertically to the female mold to squeeze the crucible paste to form the crucible;

[0064] S30, the male mold and the crucible pressing device move in a vertical direction toward a side away from the female mold to perform demolding.

[0065] Further, referring to FIG8 , step S20 in which the male mold and the crucible pressing device are moved vertically to the female mold to extrude the crucible paste to form the crucible may specifically include the following steps:

[0066] S21, the male mold and the crucible pressing device move synchronously toward the female mold to press the crucible paste, so that the crucible paste is constantly pressed for a preset time period;

[0067] S22, the male mold continues to move toward the side close to the base, and the crucible pressing device simultaneously moves toward the side away from the base, so as to form the crucible.

[0068] Referring to FIG9 , step S21 specifically includes:

[0069] S211, the male mold and the crucible pressing device move synchronously toward the female mold to contact the crucible paste;

[0070] S212, the punch and the crucible pressing device continue to move synchronously toward the side close to the base, and gradually increase the pressure to a set pressure;

[0071] S213 , the male mold and the crucible pressing device maintain the set pressure for the preset time period, so that the crucible paste is kept at a constant pressure.

[0072] Referring to FIG. 10 , step S22 specifically includes:

[0073] S221, the punch gradually increases pressure and moves toward a side close to the base to a first defined position, where the first defined position is used to define the thickness of the crucible bottom;

[0074] S222: The crucible pressure device gradually reduces the pressure and simultaneously moves to a second defined position facing away from the base, where the second defined position is higher than a standard height of the crucible.

[0075] Referring to FIG. 11 , after step S22, the following steps may be further included, for example:

[0076] S23, the convex mold remains in the same position, the crucible pressure device increases the pressure and slowly moves down to a third defined position, the third defined position is used to define the standard height of the crucible;

[0077] S24, the male mold and the crucible opening pressing device maintain pressure for a set time to form the crucible opening.

[0078] Referring to FIG12 , step S30 wherein the male mold and the crucible pressing device are moved vertically toward a side away from the female mold for demoulding, specifically comprising the following steps:

[0079] S31, the punch and the crucible pressing device are simultaneously depressurized;

[0080] S32, the crucible pressing device maintains its position, and the male die moves to the side away from the female die to the initial position; and

[0081] S33, the crucible pressing device moves to an initial position toward a side away from the die.

[0082] In one implementation of this embodiment, the graphite crucible preparation method further includes controlling the movement distance of the punch via a first displacement controller 122 and controlling the movement distance of the crucible press mouth device via a second displacement controller 222. In step S222, the crucible press mouth device gradually reduces pressure and simultaneously moves toward a side away from the base to a second defined position. When the second defined position is higher than the standard crucible height, the method further includes detecting the movement distance of the crucible press mouth device by the second displacement controller to reflect the properties of the crucible paste. Under the set punch pressure and crucible press mouth device pressure conditions, the movement distance of the crucible press mouth device detected by the second displacement controller 222 can reflect the properties of the crucible paste.

[0083] In one embodiment of this embodiment, after the male mold and the crucible-pressing device are moved vertically toward a side away from the female mold to perform demolding, the process further includes injecting 50% to 90% of the crucible's volume of a coolant into the formed crucible. Injecting 50% to 90% of the crucible's volume of coolant into the formed crucible cools and shrinks the crucible, facilitating demolding and improving demolding efficiency. The coolant can be, for example, cooling water or another coolant, and can be selected based on actual needs.

[0084] 13A to 13F , the graphite crucible preparation method provided in this embodiment can be applied to the graphite crucible forming apparatus 100 provided in the above embodiment, for example. The preparation method using the graphite crucible forming apparatus 100 will be described in detail below.

[0085] Referring to Figure 13A , when the first and second hydraulic cylinders 11 and 21 are in their initial positions, the male mold 31 and the crucible-pressing device 32 are also in their initial positions. A set weight of crucible paste 60 is added to the female mold 33. The set weight can be, for example, the weight of crucible paste required to prepare one crucible and can be set based on actual needs. The female mold 33, with the crucible paste 60 added, can be moved, for example, via the movable platform 50, to a position on the base 41 corresponding to the male mold 31.

[0086] Referring to Figure 13B , the first and second hydraulic cylinders 11 and 21 drive the first and second sliding beams 12 and 22 to move synchronously in a vertical direction toward the side closest to the base 41, i.e., downward. This causes the punch 31 to pass through the opening 323 of the crucible pressing device 32 and move downward together with the crucible pressing device 32 to contact the crucible paste 60 in the die 33. The first and second hydraulic cylinders 11 and 21 continue to move downward synchronously, gradually increasing pressure to a set pressure. The punch 31 and the crucible pressing device 32 maintain the set pressure for a preset period of time to maintain a constant pressure on the crucible paste 60. The set pressure and preset time can be set according to actual needs. By synchronizing the pressure of the punch 31 and the crucible pressing device 32 to the set pressure and then maintaining the pressure for a preset period of time, i.e., the constant pressure preset time, each area of ​​the crucible paste 60 in the die 33 is maintained at an equal pressure, ensuring uniform pressure within each area of ​​the crucible paste 60.

[0087] Referring to Figure 13C , the first hydraulic cylinder 11 continues to move the punch 31 downward while gradually increasing pressure, while the second hydraulic cylinder 21 continues to gradually reduce pressure on the crucible mouth device 32. The crucible paste is squeezed by the punch 31, causing the crucible paste 60 to tilt upward and press against the crucible mouth device 32, which then moves upward as the crucible paste 60 is squeezed. As the first hydraulic cylinder 11 is pressurized and moved downward, the crucible paste 60 in the die 33 is squeezed and flipped upward. At the same time, the crucible mouth device 32 performs parallel blocking on the flipping of the crucible paste 60, so that the original free and disordered flipping is changed into a controlled, regular, and orderly flipping under the intervention of a certain external force; as the crucible paste 60 flips upward, the friction resistance experienced by the crucible paste 60 gradually increases, so it is necessary to gradually increase the input pressure of the first hydraulic cylinder 11 and gradually reduce the input pressure of the second hydraulic cylinder 21 so that the pressure on the crucible paste 60 is in a stable state, thereby achieving uniform density of the graphite crucible, thereby improving the strength and oxidation resistance of the graphite crucible, and further improving the service life of the graphite crucible.

[0088] In one embodiment of this invention, when the crucible paste 60 presses upward against the crucible mouth device 32 under the pressure of the punch 31, the crucible mouth device 32 is forced to move toward the side away from the base 41. The second displacement controller 222 can detect the movement distance of the crucible mouth device 32. Characterizing the properties of crucible paste has always been a difficult problem that has plagued the carbon industry. It plays a vital role in the performance and stability of carbon products. Paste performance is closely related to its formulation, particle size distribution, and temperature. It is usually determined based on the experience of technicians and cannot be quantitatively characterized. The movement distance of the crucible mouth device 32 can reflect the performance of the crucible paste 60. The greater the movement distance, the better the plasticity of the crucible paste 60. By configuring the second displacement controller 222, the plasticity of the paste during molding can be measured and the paste plasticity state can be automatically recorded during the production process. This transforms the plasticity of the paste during production from a traditional sensory measurement into quantifiable data, providing a basis for the digitalization and intelligentization of the carbon industry. This is of epoch-making significance and will surely promote the improvement of the process level of crucible molding and even the specialty carbon industry.

[0089] Referring to Figure 13D , after the crucible paste 60 is tilted upward into position, the first hydraulic cylinder 11 drives the punch 31 downward to a first defined position, which defines the crucible bottom thickness. Simultaneously, the second hydraulic cylinder 21 moves upward to a second defined height, which is higher than the standard crucible height. The first hydraulic cylinder 11 then reduces pressure and drives the punch 31 to maintain its position. The second hydraulic cylinder 21 increases pressure and drives the mouth-pressing device 32 to slowly move downward to a third defined position, which defines the standard crucible height. The first and second hydraulic cylinders 11 and 21 drive the punch 31 and mouth-pressing device 32 to increase and maintain pressure, thereby forming the crucible mouth. The arrangement of the punch 31 and mouth-pressing device 32 allows for secondary pressurization of the mouth, achieving precise control of the crucible height and increasing the density of the crucible mouth. This, in turn, enhances the strength of the graphite crucible mouth, reduces the likelihood of cracking, and further increases the lifespan of the graphite crucible.

[0090] Referring to Figures 13E and 13F , after the first and second hydraulic cylinders 11 and 21 maintain pressure for a set period, they simultaneously drive the punch 31 and the crucible-holding device 32 to release pressure. The crucible-holding device 32 remains in position, and the first hydraulic cylinder 11 slowly drives the punch 31 back toward its initial position, facing away from the die 33. Then, the second hydraulic cylinder 21 slowly drives the crucible-holding device 32 back toward its initial position, thereby achieving demolding. During demolding, the crucible-holding device 32 supports the crucible opening. Simultaneously, after the first hydraulic cylinder 11 releases pressure, it applies an upward pull equivalent to its own weight in the reverse direction. This prevents the crucible from being pulled out of the punch 31 and potentially damaging it, thereby improving the yield rate of graphite crucible molding.

[0091] The mobile platform 50 can, for example, move the formed crucible and the die 33 from the forming station (i.e., the position of the base 41 corresponding to the punch 31), and at the same time, for example, move another set of die 33 with a set weight of crucible paste 60 added to the forming station, and cycle the above preparation steps to prepare a new crucible.

[0092] During the preparation process of the graphite crucible, the first displacement controller 122 and the second displacement controller 222 are used to control the moving distance of the punch 31 and the crucible pressing device 32, so that the height, bottom thickness, etc. of the crucible can be accurately controlled, making the height, thickness, etc. of the crucible more controllable, the size of the formed crucible more accurate, and the preparation process is simple and easy to operate.

[0093] At present, most crucible forming methods in the prior art adopt hydraulic reverse extrusion forming. The crucible prepared by hydraulic reverse extrusion forming has a normal volume density of 1.72 g / cm 3However, during the reverse extrusion process, the paste is freely turned up under the pressure of the pressure head, and the bulk density of the crucible increases from 1.72g / cm 3 Gradually reduced to 1.68g / cm at the crucible mouth 3 The following causes the crucible to crack at the mouth during use, rendering it useless, with a typical service life of around four times. At the same time, to increase the graphitization loading and maximize the crucible's volume, the crucible's diameter and height are becoming larger and larger, while the wall thickness is becoming thinner and thinner, which dramatically reduces the quality of the upper part of the crucible. To ensure the crucible's yield and service life, the process becomes increasingly difficult, hindering improvements in crucible quality and life.

[0094] The graphite crucible prepared by the graphite crucible forming apparatus 100 provided in this embodiment not only improves the density of the crucible, but also fundamentally solves the problem of uneven density of the crucible. The density of the graphite crucible prepared by the graphite crucible forming apparatus 100 provided in this embodiment can reach 1.72g / cm 3 , and are consistent up and down; the service life of the crucible is increased from the traditional 3 to 4 times to 6 to 8 times. Under the current circumstances, each set of crucibles can generate a net profit of more than 300 yuan.

[0095] In summary, the graphite crucible forming equipment 100 provided in the embodiment of the present invention forms a crucible from the crucible paste 60 through the cooperation of the punch 31, the crucible mouth pressure device 32, and the die 33. By setting the crucible mouth pressure device 32, the crucible mouth pressure device 32 and the punch 31 simultaneously perform constant pressure forward extrusion on the crucible paste 60, which can effectively increase the density of the graphite crucible and ensure the uniformity of the density, thereby improving the strength and oxidation resistance of the graphite crucible, and further improving the service life of the graphite crucible. In addition, during the preparation process of the graphite crucible, the crucible mouth pressure device 32 always maintains pressure on the crucible mouth, so that the crucible density is increased and the density is uniform from top to bottom, improving the oxidation resistance of the crucible, and reducing the weak parts of the crucible, thereby improving the overall performance of the crucible.

[0096] In addition, it can be understood that the aforementioned embodiments are merely exemplary descriptions of the present invention. Under the premise that the technical features do not conflict, the structures do not contradict, and the purpose of the present invention is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used in combination.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A graphite crucible forming device (100), characterized in that: include: A support frame (40), the support frame (40) comprising a base (41); A convex mold (31) is disposed on the support frame (40) away from the base (41), and the convex mold (31) can reciprocate in a vertical direction relative to the support frame (40); A crucible pressing mouth device (32) is provided on the support frame (40) and is correspondingly provided on a side of the punch (31) close to the base (41). The crucible pressing mouth device (32) can reciprocate in a vertical direction relative to the support frame (40). An opening portion (323) for the punch (31) to pass through is provided on the crucible pressing mouth device (32); as well as A female mold (33) is arranged on the base (41) and corresponds to the male mold (31). The female mold (33) is used to accommodate the crucible paste (60). The male mold (31), the crucible pressure port device (32) and the female mold (33) cooperate to form the crucible paste (60) into a crucible.

2. The graphite crucible forming device (100) according to claim 1, characterized in that: The crucible mouth device (32) is an annular structure, the outer diameter of the crucible mouth device (32) is smaller than the inner diameter of the die (33), and the inner diameter of the crucible mouth device (32) is larger than the outer diameter of the punch (31).

3. The graphite crucible forming device (100) according to claim 2, characterized in that: The punch (31) is a columnar structure, the die (33) is provided with a paste receiving groove (331), the paste receiving groove (331) is a columnar structure matching the punch (31), the outer diameter of the punch (31) is smaller than the inner diameter of the paste receiving groove (331), the ring width W1 of the crucible pressure mouth device (32) is W1 = (D1-D2) ÷ 2, wherein W1 is the ring width of the crucible pressure mouth device (32), D1 is the inner diameter of the paste receiving groove (331), and D2 is the outer diameter of the punch (31).

4. The graphite crucible forming device (100) according to claim 1, characterized in that: The crucible opening device (32) comprises a cylinder (321) and a limiting portion (322) connected to the cylinder (321); the opening (323) is arranged on the cylinder (321); when the crucible opening device (32) moves toward the die (33) to a preset height, the limiting portion (322) abuts against the die (33).

5. The graphite crucible forming device (100) according to claim 1, characterized in that: The support frame (40) further includes a column (42); the graphite crucible forming device (100) further includes: a first driving assembly (10), comprising a first hydraulic cylinder (11) and a first sliding beam (12), wherein the first hydraulic cylinder (11) is disposed on the support frame (40), the first hydraulic cylinder (11) is connected to the first sliding beam (12), the first sliding beam (12) is slidably connected to the column (42), the punch (31) is fixedly connected to a side of the first sliding beam (12) close to the base (41), and the first hydraulic cylinder (11) is used to drive the first sliding beam (12) to reciprocate in a vertical direction; and The second driving assembly (20) includes a second hydraulic cylinder (21) and a second sliding beam (22), wherein the second hydraulic cylinder (21) is arranged on the support frame (40), the second hydraulic cylinder (21) is connected to the second sliding beam (22), the second sliding beam (22) is arranged on a side of the first sliding beam (12) close to the base (41), and the second sliding beam (22) is slidably connected to the column (42), the crucible pressing mouth device (32) is fixedly connected to a side of the second sliding beam (22) close to the base (41), and the second hydraulic cylinder (21) is used to drive the second sliding beam (22) to move back and forth in a vertical direction.

6. The graphite crucible forming device (100) according to claim 5, characterized in that: The second sliding beam (22) is provided with a punch avoidance hole (221), the punch avoidance hole (221) is arranged corresponding to the punch (31), and the crucible pressing mouth device (32) is arranged on a side of the second sliding beam (22) close to the base (41) corresponding to the punch avoidance hole (221).

7. The graphite crucible forming device (100) according to claim 5, characterized in that: The second hydraulic cylinders (21) include two, the two second hydraulic cylinders (21) are symmetrically arranged on both sides of the first hydraulic cylinder (11), and the two second hydraulic cylinders (21) are respectively connected to the two ends of the second sliding beam (22) through piston rods.

8. The graphite crucible forming device (100) according to claim 5, characterized in that: The first sliding beam (12) and the second sliding beam (22) are both provided with a connecting through hole (121), and the connecting through hole (121) is sleeved on the column (42). The first sliding beam (12) and the second sliding beam (22) are slidably connected to the column (42) through the connecting through hole (121).

9. [Corrected 21.05.2024 according to Rule 26] The graphite crucible forming device (100) according to claim 8, characterized in that A guide sleeve adapted to the column (42) is provided in the connecting through hole (121), a lubrication groove is provided on the inner side wall of the guide sleeve, and a dust ring is provided in the lubrication groove.

10. The graphite crucible forming device (100) according to claim 5, characterized in that: Also includes: a first displacement controller (122), arranged on the first sliding beam (12), for controlling the moving distance of the punch (31); A second displacement controller (222) is provided on the second sliding beam (22) and is used to control the moving distance of the crucible opening device (32).

11. The graphite crucible forming device (100) according to claim 10, characterized in that: The second displacement controller (222) is also used to detect the movement distance of the crucible pressing device (32) when it is pressed by the crucible paste (60) toward the side away from the base (41), so as to detect the performance of the crucible paste (60).

12. The graphite crucible forming device (100) according to claim 1, characterized in that: The number of the concave mold (33) is at least one; the graphite crucible forming device (100) further includes: The movable platform (50) is slidably connected to the base (41), and at least one of the male molds (31) is arranged on the movable platform (50). The movable platform (50) can drive the male mold (31) to move back and forth relative to the base (41).

13. A method for preparing a graphite crucible, characterized in that: include: Add a set weight of crucible paste into the concave mold; The male die and the crucible pressing device move vertically to the female die to extrude the crucible paste to form the crucible; The male mold and the crucible pressing device move in a vertical direction toward a side away from the female mold to perform demoulding.

14. The method for preparing a graphite crucible according to claim 13, wherein: The male mold and the crucible pressing device are moved vertically to the female mold to extrude the crucible paste to form the crucible, specifically comprising: The male mold and the crucible pressing device move synchronously toward the female mold to press the crucible paste, so that the crucible paste is constantly pressed for a preset time period; The convex mold continues to move toward the side close to the base, and the crucible pressing device simultaneously moves toward the side away from the base, so as to shape the crucible.

15. The method for preparing a graphite crucible according to claim 14, wherein: The male mold and the crucible pressing device are synchronously moved toward the female mold to press the crucible paste, so that the crucible paste is constantly pressed for a preset time, specifically comprising: The male mold and the crucible pressing device move synchronously toward the female mold to contact the crucible paste; The punch and the crucible pressing device continue to move synchronously toward the side close to the base, and gradually increase the pressure to the set pressure; The male mold and the crucible pressing device maintain the set pressure for the preset time period so that the crucible paste is constantly pressurized.

16. The method for preparing a graphite crucible according to claim 14, wherein: The punch continues to move toward the side close to the base, and the crucible pressing device simultaneously moves toward the side away from the base, so as to form the crucible, specifically comprising: The punch gradually increases pressure and moves toward a side close to the base to a first limited position, wherein the first limited position is used to limit the thickness of the crucible bottom; The crucible pressure device gradually reduces the pressure and simultaneously moves toward a side away from the base to a second limited position, where the second limited position is higher than a standard height of the crucible.

17. The method for preparing a graphite crucible according to claim 16, wherein: When the punch continues to move toward the side close to the base, the crucible pressing device simultaneously moves toward the side away from the base to form the crucible, and thereafter, the method further includes: The convex mold remains in a constant position, and the crucible pressure device increases pressure and slowly moves down to a third defined position, wherein the third defined position is used to define a standard height of the crucible; The male mold and the crucible opening pressing device maintain pressure for a set time period to form the crucible opening.

18. The method for preparing a graphite crucible according to claim 13, wherein: The male mold and the crucible pressing device are moved in a vertical direction toward a side away from the female mold to perform demoulding, specifically comprising: The punch and the crucible pressure device release pressure synchronously; The crucible pressing device maintains its position, and the male die moves to an initial position toward a side away from the female die; and The crucible pressing device moves to an initial position toward a side away from the die.

19. The method for preparing a graphite crucible according to claim 13, wherein: After the male mold and the crucible pressing device are moved in a vertical direction toward a side away from the female mold for demoulding, the method further comprises: Inject 50% to 90% of the crucible volume of the coolant into the formed crucible.

20. A graphite crucible forming device (100), characterized in that: include: Support frame (40); A concave mold (33) is connected to the support frame (40), and a paste receiving groove (331) for receiving the crucible paste (60) is provided on the concave mold (33); A male mold (31) is connected to the support frame (40) and is disposed corresponding to the paste receiving groove (331); A crucible pressing mouth device (32) is connected to the support frame (40), and an opening portion (323) is provided on the crucible pressing mouth device (32), and the opening portion (323) corresponds to the convex mold (31) and the paste receiving groove (331); The punch (31) and the crucible mouth device (32) are used to cooperate with each other to extrude the crucible paste (60) in the paste receiving groove (331) to form a crucible; in the process of forming the crucible, the crucible mouth device (32) can move back and forth relative to the support frame (40) and enter and exit the paste receiving groove (331), and the punch (31) can move back and forth relative to the support frame (40) and enter and exit the paste receiving groove (331) through the opening (323).

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