Large-diameter isostatic pressing graphite forming die

Abstract

The utility model relates to the field of isostatic pressing forming dies, and discloses a large-diameter isostatic pressing graphite forming die which comprises a bottom plate, a die outer cylinder is fixedly installed at the top of the bottom plate, the top and the front side of the die outer cylinder are each of an opening structure, and a large-diameter isostatic pressing bottom die is arranged in the die outer cylinder; the top and the bottom of the large-diameter isostatic pressing bottom die are each of an opening structure. The vibration pre-treatment device has the following advantages and effects that the outer side wall of the large-diameter isostatic pressing bottom die can be periodically knocked to generate vibration force, raw materials in the large-diameter isostatic pressing bottom die can be subjected to vibration pre-treatment in the process of adding graphite powder into the large-diameter isostatic pressing bottom die, air in the graphite powder can be easily removed, and the quality of the graphite powder is improved. The raw materials are distributed more uniformly and compactly, and the compactness and uniformity of isostatic pressing graphite forming are improved; and after isostatic pressing is completed, vibration force can be transmitted to the graphite product, the adhesive force between the graphite product and the inner side wall of the large-diameter isostatic pressing bottom die is effectively reduced, and rapid and smooth demolding of the graphite product is facilitated.

Description

Technical Field

[0001] This application relates to the field of isostatic pressing molding die technology, and in particular to a large-diameter isostatic pressing graphite molding die. Background Technology

[0002] In modern industry, large-diameter isostatically pressed graphite is widely used in key fields such as semiconductor manufacturing, photovoltaic industry, nuclear power generation, and electrical discharge machining due to its excellent electrical conductivity, high temperature resistance, chemical stability, and good machinability. The manufacturing process of large-diameter isostatically pressed graphite products requires the use of large-diameter isostatically pressed graphite molding dies to isostatically press graphite powder into graphite products.

[0003] Existing large-diameter isostatic pressing graphite molding dies still have at least the following shortcomings in practical use: First, in the process of pouring graphite powder into the molding die, air in the graphite powder cannot be fully removed, resulting in uneven distribution of raw materials, which in turn affects the density and uniformity of graphite products and reduces product performance; Second, in the demolding process after isostatic pressing, the adhesion between the graphite product and the inner wall of the molding die is large, making demolding difficult and hindering the quick and smooth removal of the graphite product.

[0004] Therefore, we propose a large-diameter isostatic graphite forming mold to solve the above problems. Utility Model Content

[0005] The purpose of this application is to provide a large-diameter isostatic pressing graphite molding die, which can periodically strike the outer wall of the large-diameter isostatic pressing bottom die to generate vibration force. During the process of adding graphite powder into the large-diameter isostatic pressing bottom die, it helps to remove air from the graphite powder, making the raw material distribution more uniform and dense, and improving the density and uniformity of isostatic pressing graphite molding. After isostatic pressing is completed, it can transmit the vibration force to the graphite product, which helps to achieve the effect of rapid and smooth demolding of the graphite product.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: A large-diameter isostatic pressing graphite molding die includes a base plate, a mold outer cylinder fixedly installed on the top of the base plate, the top and front sides of the mold outer cylinder being open structures, a large-diameter isostatic pressing bottom mold disposed inside the mold outer cylinder, the top and bottom of the large-diameter isostatic pressing bottom mold being open structures, the bottom of the large-diameter isostatic pressing bottom mold abutting against the bottom inner wall of the mold outer cylinder, a vertical groove provided on the left inner wall of the mold outer cylinder, a shaft seat fixedly installed on the bottom inner wall of the vertical groove, a lead screw rotatably installed on the top of the shaft seat, a lifting plate threaded on the lead screw, the right side of the lifting plate being fixedly connected to the top left side of the large-diameter isostatic pressing bottom mold, a motor being fixedly installed on the top left side of the mold outer cylinder, the output shaft end of the motor being fixedly connected to the top end of the lead screw, and a vibration mechanism located below the lifting plate disposed inside the mold outer cylinder, the vibration mechanism using... To apply vibration force to a large-diameter isostatic pressing bottom mold, a hanger is fixedly installed on the top of the bottom plate, and a hydraulic cylinder is fixedly installed on the top of the hanger. A large-diameter isostatic pressing upper mold is set directly above the large-diameter isostatic pressing bottom mold. The bottom of the large-diameter isostatic pressing upper mold has an open structure. The inner diameter of the large-diameter isostatic pressing upper mold is the same as that of the large-diameter isostatic pressing bottom mold. A hollow column is fixedly installed on the top of the large-diameter isostatic pressing upper mold, and the bottom end of the hollow column is located inside the large-diameter isostatic pressing upper mold. The output shaft end of the hydraulic cylinder is fixedly connected to the top end of the hollow column. A static pressure plate is set inside the large-diameter isostatic pressing upper mold. The outer wall of the static pressure plate is in sliding sealing contact with the inner wall of the large-diameter isostatic pressing upper mold. A sliding plate is slidably installed inside the hollow column. A column is fixedly installed at the bottom of the sliding plate. The bottom end of the column is fixedly connected to the top of the static pressure plate. A spring is fixedly installed on the top of the sliding plate, and the top end of the spring is fixedly connected to the inner wall of the top of the hollow column.

[0007] A further feature of this application is that a guide groove is provided on the inner right side of the large-diameter isostatic pressing mold, a vertical guide rod is fixedly installed in the guide groove, a guide plate is slidably sleeved on the vertical guide rod, and the left side of the guide plate is fixedly connected to the top right side of the large-diameter isostatic pressing mold.

[0008] A further feature of this application is that a sealing groove is provided on the top of the large-diameter isostatic pressing bottom mold, and a sealing ring is fixedly installed on the bottom of the large-diameter isostatic pressing upper mold, the sealing ring being adapted to the sealing groove.

[0009] A further feature of this application is that: a guide hole is provided at the bottom of the hollow column, the bottom end of the column passes through the guide hole, and a sealing ring II is fixedly installed on the inner wall of the guide hole, and the column slides and seals with the guide hole through the sealing ring II.

[0010] A further feature of this application is that a pressure sensor located above the static pressure plate is fixedly installed on one inner wall of the large-diameter isostatic pressing upper mold.

[0011] A further provision of this application is that: a one-way air inlet pipe connector and a one-way air outlet pipe connector are fixedly installed on the top of the large-diameter isostatic pressing upper mold, both of which are connected to the interior of the large-diameter isostatic pressing upper mold; an air inlet hose is fixedly connected to the top of the one-way air inlet pipe connector, and an air extraction hose is fixedly connected to the top of the one-way air outlet pipe connector.

[0012] A further configuration of this application is as follows: the vibration mechanism includes a rotating ring, multiple U-shaped plates, multiple crossbars, multiple connecting plates, multiple springs, multiple striking balls, bearings, an external gear ring, a motor, and gears. The bearings are fixedly installed on the inner wall of the outer cylinder of the mold and located below the lifting plate. The rotating ring is installed on the inner ring wall of the bearing. The multiple U-shaped plates are all fixedly installed on the inner ring wall of the rotating ring and are distributed in an evenly spaced ring. The multiple crossbars slide through the corresponding U-shaped plates. The multiple connecting plates are fixedly installed at the ends of the crossbars away from the large-diameter isostatic pressing bottom mold. The multiple springs are fixedly installed on the corresponding connecting plates. One end of each spring is fixedly connected to the inner wall of the outer cylinder of the mold. Multiple striking balls are fixedly installed at the end of the crossbar near the large-diameter isostatic pressing bottom mold. Multiple striking balls abut against the outer wall of the large-diameter isostatic pressing bottom mold. The outer gear ring is fixedly sleeved on the swivel ring and located below the bearing. An installation groove is opened on the left inner wall of the outer cylinder of the mold. Motor 2 is fixedly installed in the installation groove. The gear is fixedly installed on the output shaft end of motor 2. The gear meshes with the outer gear ring. Multiple arc-shaped blocks are fixedly installed on the outer wall of the large-diameter isostatic pressing bottom mold in an equally spaced ring. Multiple arc-shaped blocks and multiple striking balls are all located on the same horizontal plane.

[0013] A further feature of this application is that the bottom of the large-diameter isostatic pressing mold and the inner wall of the bottom of the mold outer cylinder are both smooth and flat.

[0014] This application includes at least one of the following beneficial technical effects:

[0015] This application utilizes the synergistic effect of a vibration mechanism and multiple arc-shaped blocks to periodically strike the outer wall of a large-diameter isostatic pressing mold, generating vibration force. This vibration force serves two purposes: firstly, during the addition of graphite powder into the mold, it provides a pre-treatment of the raw material, helping to remove air from the powder and resulting in a more uniform and dense distribution of the material. This improves the density and uniformity of the isostatic pressing process, enhancing the performance and quality of the graphite products. Secondly, after isostatic pressing, when the large-diameter isostatic pressing mold is raised to demold the graphite products, the vibration force is transmitted to the graphite products, effectively reducing the adhesion between the graphite products and the inner wall of the large-diameter isostatic pressing mold, facilitating rapid and smooth demolding. Attached Figure Description

[0016] Figure 1This is a front-view stereoscopic structural diagram of this embodiment.

[0017] Figure 2 This is a front view sectional three-dimensional structural schematic diagram of this embodiment.

[0018] Figure 3 This is a top-view three-dimensional structural diagram of the outer cylinder of the mold.

[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of a large-diameter isostatic pressing bottom mold.

[0020] Figure 5 This is a three-dimensional structural diagram of the vibration mechanism.

[0021] In the diagram, 1. Base plate; 2. Mold outer cylinder; 3. Large-diameter isostatic pressing bottom mold; 4. Vertical groove; 5. Shaft seat; 6. Lead screw; 7. Lifting plate; 8. Motor 1; 9. Guide groove; 10. Guide plate; 11. Vertical guide rod; 12. Vibration mechanism; 121. Rotary ring; 122. U-shaped plate; 123. Horizontal bar; 124. Connecting plate; 125. Spring 2; 126. Knocking ball; 127. Bearing; 128. External gear ring; 129. Electric... Machine 2; 1210, Gear; 13, Mounting slot; 14, Hanger; 15, Hydraulic cylinder; 16, Large diameter isostatic pressing upper mold; 17, Hollow column; 18, Static pressure plate; 19, Slide plate; 20, Column; 21, Spring 1; 22, Sealing groove; 23, Sealing ring 1; 24, Pressure sensor; 25, One-way air inlet pipe connector; 26, One-way air outlet pipe connector; 27, Air inlet hose; 28, Air extraction hose; 29, Arc block. Detailed Implementation

[0022] The technical solution of this application will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] See Figures 1-5This application provides a large-diameter isostatic pressing graphite molding die, including a base plate 1. A mold outer cylinder 2 is fixedly installed on the top of the base plate 1. The top and front of the mold outer cylinder 2 are open. The top opening of the mold outer cylinder 2 facilitates the entry and exit of the large-diameter isostatic pressing upper mold 16, and facilitates mold closing and demolding. The front opening of the mold outer cylinder 2 facilitates the addition of graphite powder into the large-diameter isostatic pressing bottom mold 3, and also facilitates the removal of the isostatically pressed graphite product. A large-diameter isostatic pressing bottom mold 3 is provided inside the mold outer cylinder 2. The top and bottom of the large-diameter isostatic pressing bottom mold 3 are open. The structure comprises a large-diameter isostatic pressing bottom mold 3 whose bottom abuts against the inner wall of the bottom of the mold outer cylinder 2. A vertical groove 4 is provided on the left inner wall of the mold outer cylinder 2, and a bearing seat 5 is fixedly installed on the bottom inner wall of the vertical groove 4. A lead screw 6 is rotatably installed on the top of the bearing seat 5, and a lifting plate 7 is threaded onto the lead screw 6. The right side of the lifting plate 7 is fixedly connected to the top left side of the large-diameter isostatic pressing bottom mold 3. A motor 8 is fixedly installed on the top left side of the mold outer cylinder 2, and the output shaft end of the motor 8 is fixedly connected to the top end of the lead screw 6. By driving the lead screw 6 to rotate through the motor 8, the lifting plate 7 can be controlled to drive the large-diameter isostatic pressing bottom mold 3. The isostatic pressing bottom mold 3 is raised and lowered to facilitate demolding of the isostatically pressed graphite. It should be noted that motor 8 is a reversible motor. A hanger 14 is fixedly installed on the top of the base plate 1, and a hydraulic cylinder 15 is fixedly installed on the top of the hanger 14. A large-diameter isostatic pressing upper mold 16 is positioned directly above the large-diameter isostatic pressing bottom mold 3. The bottom of the large-diameter isostatic pressing upper mold 16 has an open structure, and the inner diameter of the large-diameter isostatic pressing upper mold 16 is the same as that of the large-diameter isostatic pressing bottom mold 3. A hollow column 17 is fixedly installed on the top of the large-diameter isostatic pressing upper mold 16. The bottom end is located inside the large-diameter isostatic pressing upper mold 16. The output shaft end of the hydraulic cylinder 15 is fixedly connected to the top end of the hollow column 17. A static pressure plate 18 is provided inside the large-diameter isostatic pressing upper mold 16. The outer side wall of the static pressure plate 18 is in sliding sealing contact with the inner side wall of the large-diameter isostatic pressing upper mold 16. A sliding plate 19 is slidably installed inside the hollow column 17. A column 20 is fixedly installed at the bottom of the sliding plate 19. The bottom end of the column 20 is fixedly connected to the top of the static pressure plate 18. A spring 21 is fixedly installed at the top of the sliding plate 19. The top end of the spring 21 is fixedly connected to the top inner wall of the hollow column 17.

[0024] In this embodiment, a guide groove 9 is provided on the inner right side of the large-diameter isostatic pressing mold 3. A vertical guide rod 11 is fixedly installed in the guide groove 9. A guide plate 10 is slidably sleeved on the vertical guide rod 11. The left side of the guide plate 10 is fixedly connected to the top right side of the large-diameter isostatic pressing mold 3. By using the guiding cooperation between the vertical guide rod 11 and the guide plate 10, it can be ensured that the lifting plate 7 drives the large-diameter isostatic pressing mold 3 to move vertically and smoothly.

[0025] In this embodiment, a sealing groove 22 is provided on the top of the large-diameter isostatic pressing bottom mold 3, and a sealing ring 23 is fixedly installed on the bottom of the large-diameter isostatic pressing upper mold 16. The sealing ring 23 is adapted to the sealing groove 22. The sealing groove 22 and the upper sealing ring 23 are designed to seal each other, which can effectively seal the contact surface of the large-diameter isostatic pressing upper mold 16 and the large-diameter isostatic pressing bottom mold 3 when they are molded together.

[0026] In this embodiment, a guide hole is provided at the bottom of the hollow column 17, and the bottom end of the column 20 passes through the guide hole. A sealing ring II is fixedly installed on the inner wall of the guide hole. The column 20 slides and seals with the guide hole through the sealing ring II. The design of the sealing ring II can seal the gap between the column 20 and the guide hole, preventing air from entering the hollow column 17.

[0027] In this embodiment, a pressure sensor 24 located above the static pressure plate 18 is fixedly installed on one inner wall of the large-diameter isostatic pressing upper mold 16. The pressure sensor 24 can monitor the changes in air pressure inside the large-diameter isostatic pressing upper mold 16 in real time, so that the operator can adjust the gas pressure in a timely manner.

[0028] In this embodiment, a one-way air inlet connector 25 and a one-way air outlet connector 26 are fixedly installed on the top of the large-diameter isostatic pressing upper mold 16. Both the one-way air inlet connector 25 and the one-way air outlet connector 26 are connected to the interior of the large-diameter isostatic pressing upper mold 16. An air inlet hose 27 is fixedly connected to the top of the one-way air inlet connector 25, and an air extraction hose 28 is fixedly connected to the top of the one-way air outlet connector 26. The design of the one-way air inlet connector 25 and the air inlet hose 27 facilitates the flow of air into the interior of the large-diameter isostatic pressing upper mold 16. The space is filled with nitrogen or argon. A one-way outlet pipe connector 26 and an extraction hose 28 are designed to extract nitrogen or argon from the internal space of the large-diameter isostatic upper mold 16. It should be noted that one end of the inlet hose 27 is fixedly connected to an external nitrogen or argon supply pipeline, and a shut-off valve is installed on the external nitrogen or argon supply pipeline to control the delivery of nitrogen or argon. The extraction hose 28 is fixedly connected to the suction end of an external suction pump, and a shut-off valve is also installed on the suction end of the external suction pump.

[0029] In this embodiment, a vibration mechanism 12 located below the lifting plate 7 is provided inside the outer cylinder 2 of the mold. The vibration mechanism 12 is used to apply vibration force to the large-diameter isostatic pressing bottom mold 3. The vibration mechanism 12 includes a rotating ring 121, multiple U-shaped plates 122, multiple crossbars 123, multiple connecting plates 124, multiple springs 125, multiple striking balls 126, a bearing 127, an external gear ring 128, a motor 129, and a gear 1210. The bearing 127 is fixedly installed on the inner side wall of the outer cylinder 2 of the mold and located below the lifting plate 7. The rotating ring 121 is installed on the inner ring wall of the bearing 127. The multiple U-shaped plates 122 are all fixedly installed on the inner ring wall of the rotating ring 121 and are distributed in an evenly spaced ring. The multiple crossbars 123 slide through the corresponding U-shaped plates. Plate 122 and multiple connecting plates 124 are respectively fixedly installed on the end of the crossbar 123 away from the large-diameter isostatic pressing bottom mold 3. Multiple springs 125 are respectively fixedly installed on the corresponding connecting plates 124, and one end of each spring 125 is fixedly connected to the inner side wall of the outer cylinder 2 of the mold. Multiple striking balls 126 are respectively fixedly installed on the end of the crossbar 123 near the large-diameter isostatic pressing bottom mold 3, and the multiple striking balls 126 abut against the outer side wall of the large-diameter isostatic pressing bottom mold 3. The external gear ring 128 is fixedly sleeved on the rotating ring 121 and located below the bearing 127. An installation groove 13 is opened on the left inner wall of the outer cylinder 2 of the mold. The second motor 129 is fixedly installed in the installation groove 13, and the gear 1210 is fixedly installed on the output shaft end of the second motor 129. Gear 1210 meshes with external gear ring 128. Multiple arc-shaped blocks 29, evenly spaced and arranged in a ring, are fixedly installed on the outer wall of the large-diameter isostatic pressing mold 3. All arc-shaped blocks 29 and multiple striking balls 126 are located on the same horizontal plane. Motor 129 drives gear 1210 to rotate. Utilizing the meshing transmission between gear 1210 and external gear ring 128, the rotating ring 121 can be controlled to rotate. This causes multiple U-shaped plates 122, multiple crossbars 123, multiple connecting plates 124, multiple springs 125, and multiple striking balls 126 to rotate with the rotating ring 121. Under the elastic force of spring 125, the striking balls 126 intermittently slide along the arc surface of the arc-shaped blocks 29, thus periodically striking the large-diameter isostatic pressing mold. The outer wall of the bottom mold 3 generates vibration force. By striking the outer wall of the large-diameter isostatic pressing bottom mold 3, vibration force is generated. On the one hand, when graphite powder is added into the large-diameter isostatic pressing bottom mold 3, the raw material inside the large-diameter isostatic pressing bottom mold 3 can be pre-treated by vibration. This helps to remove air from the graphite powder, making the raw material distribution more uniform and dense, thereby improving the density and uniformity of isostatic pressing graphite molding and enhancing the performance and quality of graphite products. On the other hand, when the large-diameter isostatic pressing bottom mold 3 is raised to demold the graphite product after isostatic pressing is completed, the vibration force is transmitted to the graphite product, which can effectively reduce the adhesion force between the graphite product and the inner wall of the large-diameter isostatic pressing bottom mold 3, which helps the graphite product to be demolded quickly and smoothly.

[0030] In this embodiment, the bottom of the large-diameter isostatic pressing bottom mold 3 and the bottom inner wall of the mold outer cylinder 2 are both smooth and flat, which can ensure the sealing performance when the bottom of the large-diameter isostatic pressing bottom mold 3 and the bottom inner wall of the mold outer cylinder 2 come into contact.

[0031] In this embodiment, it should be noted that a controller is installed on the front side wall of the hanger 14. The controller is equipped with a display screen and multiple control buttons. Motor 1 8, Motor 2 129, hydraulic cylinder 15, and pressure sensor 24 are all electrically connected to the controller. The pressure value monitored by pressure sensor 24 can be displayed on the display screen. The multiple control buttons are used to control the operation of motor 1 8, motor 2 129, hydraulic cylinder 15, and pressure sensor 24 respectively. Since their wiring connection method and control method are mature technologies in the field and have been fully disclosed, they will not be described in detail here.

[0032] Based on the above structure, the operating principle of the large-diameter isostatic graphite forming mold provided in this application is as follows:

[0033] The operator adds graphite powder into the large-diameter isostatic pressing mold 3. During the feeding process, the operator controls the starter motor 129 to run. The output shaft of the motor 129 drives the gear 1210 to rotate. Through the meshing transmission between the gear 1210 and the outer gear ring 128, the rotating ring 121 rotates. Multiple U-shaped plates 122, crossbars 123 and other components rotate with the rotating ring 121. The striking ball 126, under the elastic force of the spring 125, slides intermittently along the arc surface of the arc block 29, thereby intermittently striking the outer wall of the large-diameter isostatic pressing mold 3 and generating vibration force. This vibration force can remove air from the graphite powder, making the raw material distribution more uniform and dense, providing a good foundation for subsequent isostatic pressing.

[0034] After the material is added, the motor 129 is stopped. Then, the hydraulic cylinder 15 is extended. The output shaft of the hydraulic cylinder 15 pushes the hollow column 17 and the large-diameter isostatic pressing upper mold 16 to move vertically downward until the sealing ring 23 at the bottom of the large-diameter isostatic pressing upper mold 16 is embedded in the sealing groove 22 at the top of the large-diameter isostatic pressing lower mold 3, thus realizing the mold closing of the large-diameter isostatic pressing lower mold 3 and the large-diameter isostatic pressing upper mold 16.

[0035] After the mold is closed, nitrogen or argon is injected into the internal space of the large-diameter isostatic pressing upper mold 16 through the one-way air inlet connector 25 and the air inlet hose 27. The pressure sensor 24 is turned on to monitor the pressure change inside the large-diameter isostatic pressing upper mold 16 in real time and feeds the obtained pressure data back to the display screen of the controller. As the amount of nitrogen or argon injected gradually increases, the nitrogen or argon will apply vertical downward pressure to the static pressure plate 18. During this process, the static pressure plate 18 moves vertically downward under the action of gas pressure. The static pressure plate 18 drives the column 20 and the slide plate 19 to move downward. The spring 21 is gradually stretched and elongated to generate elastic force. The static pressure plate 18 gradually slides down into the large-diameter isostatic pressing bottom mold 3 and contacts the graphite powder, so that the pressure can be evenly transmitted to the graphite powder. When the required static pressure is reached, the injection of nitrogen or argon into the internal space of the large-diameter isostatic pressing upper mold 16 is stopped, thus realizing the isostatic pressing operation of the graphite powder.

[0036] After isostatic pressing is completed, the gas inside the large-diameter isostatic pressing upper mold 16 is first extracted through the one-way vent pipe joint 26 and the suction hose 28. Under the elastic force of spring 21, the slide plate 19, column 20 and static pressure plate 18 can be controlled to rise back to their original positions. Then, the hydraulic cylinder 15 is controlled to retract and reset, lifting the large-diameter isostatic pressing upper mold 16 back to its original position, thus completing the demolding of the large-diameter isostatic pressing bottom mold 3 and the large-diameter isostatic pressing upper mold 16. Next, motor 8 is restarted in reverse, and the lead screw 6 drives the lifting plate 7 and the large-diameter isostatic pressing bottom mold 3 to rise. At the same time, motor 129 is restarted to run, and the ball 126 strikes the outer wall of the large-diameter isostatic pressing bottom mold 3 to generate vibration force, which can reduce the adhesion force between the graphite product and the inner wall of the large-diameter isostatic pressing bottom mold 3, making it easier for the graphite product to be removed from the bottom mold. Finally, the formed graphite product is taken out through the opening on the front side of the outer cylinder 2 of the mold.

Claims

1. A large-diameter isostatic pressing graphite molding die, characterized in that, The system includes a base plate (1), on which a mold outer cylinder (2) is fixedly installed. The top and front of the mold outer cylinder (2) are open. A large-diameter isostatic pressing bottom mold (3) is provided inside the mold outer cylinder (2). The top and bottom of the large-diameter isostatic pressing bottom mold (3) are open. The bottom of the large-diameter isostatic pressing bottom mold (3) abuts against the bottom inner wall of the mold outer cylinder (2). A vertical groove (4) is provided on the left inner wall of the mold outer cylinder (2). A shaft seat (5) is fixedly installed on the bottom inner wall of the vertical groove (4). A lead screw (6) is rotatably installed on the top of the shaft seat (5). A lifting plate (7) is threaded on the lead screw (6). The right side of the lifting plate (7) is connected to the large-diameter isostatic pressing bottom mold (3). The top left side of the static pressure bottom mold (3) is fixedly connected. A motor (8) is fixedly installed on the top left side of the mold outer cylinder (2). The output shaft end of the motor (8) is fixedly connected to the top end of the lead screw (6). A vibration mechanism (12) located below the lifting plate (7) is provided inside the mold outer cylinder (2). The vibration mechanism (12) is used to apply vibration force to the large diameter isostatic pressure bottom mold (3). A hanger (14) is fixedly installed on the top of the bottom plate (1). A hydraulic cylinder (15) is fixedly installed on the top of the hanger (14). A large diameter isostatic pressure upper mold (16) is provided directly above the large diameter isostatic pressure bottom mold (3). The bottom of the large diameter isostatic pressure upper mold (16) is an open structure. The upper mold (16) has the same inner diameter as the large-diameter isostatic pressing bottom mold (3). A hollow column (17) is fixedly installed on the top of the large-diameter isostatic pressing upper mold (16). The bottom end of the hollow column (17) is located inside the large-diameter isostatic pressing upper mold (16). The output shaft end of the hydraulic cylinder (15) is fixedly connected to the top end of the hollow column (17). A static pressure plate (18) is provided inside the large-diameter isostatic pressing upper mold (16). The outer side wall of the static pressure plate (18) is in sliding sealing contact with the inner side wall of the large-diameter isostatic pressing upper mold (16). A sliding plate (19) is slidably installed inside the hollow column (17). A column (20) is fixedly installed at the bottom of the sliding plate (19). The bottom end of the column (20) is connected to the static pressure plate (16). The top of the pressure plate (18) is fixedly connected, and the top of the slide plate (19) is fixedly installed with a spring (21). The top of the spring (21) is fixedly connected to the inner wall of the top of the hollow column (17). The vibration mechanism (12) includes a rotating ring (121), multiple U-shaped plates (122), multiple crossbars (123), multiple connecting plates (124), multiple springs (125), multiple knocking balls (126), a bearing (127), an external gear ring (128), a motor (129), and a gear (1210). The bearing (127) is fixedly installed on the inner wall of the outer cylinder (2) of the mold and located below the lifting plate (7). The rotating ring (121) is installed on the inner ring wall of the bearing (127).Multiple U-shaped plates (122) are fixedly installed on the inner ring wall of the rotating ring (121) and are distributed in an evenly spaced ring. Multiple crossbars (123) slide through the corresponding U-shaped plates (122). Multiple connecting plates (124) are fixedly installed at the ends of the crossbars (123) away from the large-diameter isostatic pressing mold (3). Multiple springs (125) are fixedly installed on the corresponding connecting plates (124). One end of each spring (125) is fixedly connected to the inner side wall of the outer cylinder (2) of the mold. Multiple striking balls (126) are fixedly installed at the ends of the crossbars (123) near the large-diameter isostatic pressing mold (3). The outer toothed ring (128) is fixedly sleeved on the rotating ring (121) and located below the bearing (127), and the outer wall of the mold outer cylinder (2) is provided with an installation groove (13). The second motor (129) is fixedly installed in the installation groove (13). The gear (1210) is fixedly installed at the output shaft end of the second motor (129). The gear (1210) meshes with the outer toothed ring (128). Multiple arc-shaped blocks (29) are fixedly installed on the outer wall of the large-diameter isostatic pressing mold (3) in an equally spaced ring. The multiple arc-shaped blocks (29) and the multiple knocking balls (126) are all located on the same horizontal plane.

2. The large-diameter isostatic graphite forming mold according to claim 1, characterized in that: A guide groove (9) is provided on the inner right side of the large-diameter isostatic pressing bottom mold (3). A vertical guide rod (11) is fixedly installed in the guide groove (9). A guide plate (10) is slidably sleeved on the vertical guide rod (11). The left side of the guide plate (10) is fixedly connected to the top right side of the large-diameter isostatic pressing bottom mold (3).

3. The large-diameter isostatic graphite forming mold according to claim 1, characterized in that: The top of the large-diameter isostatic bottom mold (3) is provided with a sealing groove (22), and the bottom of the large-diameter isostatic upper mold (16) is fixedly installed with a sealing ring (23), which is adapted to the sealing groove (22).

4. The large-diameter isostatic graphite forming mold according to claim 1, characterized in that: The hollow column (17) has a guide hole at its bottom. The bottom end of the column (20) passes through the guide hole. A sealing ring II is fixedly installed on the inner wall of the guide hole. The column (20) slides and seals with the guide hole through the sealing ring II.

5. The large-diameter isostatic graphite forming mold according to claim 1, characterized in that: A pressure sensor (24) located above the static pressure plate (18) is fixedly installed on one side of the inner wall of the large-diameter isostatic pressing upper mold (16).

6. The large-diameter isostatic graphite forming mold according to claim 1, characterized in that: The top of the large-diameter isostatic pressing upper mold (16) is fixedly equipped with a one-way air inlet pipe connector (25) and a one-way air outlet pipe connector (26). The one-way air inlet pipe connector (25) and the one-way air outlet pipe connector (26) are both connected to the inside of the large-diameter isostatic pressing upper mold (16). The top of the one-way air inlet pipe connector (25) is fixedly connected with an air inlet hose (27), and the top of the one-way air outlet pipe connector (26) is fixedly connected with an air extraction hose (28).

7. The large-diameter isostatic graphite forming mold according to claim 1, characterized in that: The bottom of the large-diameter isostatic pressing bottom mold (3) and the bottom inner wall of the mold outer cylinder (2) are both smooth and flat.

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