High-thermal-conductivity isostatic pressing graphite preparation system and preparation method

Abstract

The invention provides a high-thermal-conductivity isostatic pressing graphite preparation system and method, and relates to the technical field of press machines. The preparation system comprises a feeding device and an isostatic pressing machine, the isostatic pressing machine comprises a high-pressure container, the interior of the high-pressure container is divided into a plurality of cavities from top to bottom, the cavities are in a cuboid shape, the side portions of the cavities are provided with pressurizing and pressure relief systems for controlling the pressure of the cavities to rise and fall, an inserting plate is arranged between every two vertically-adjacent cavities in a sliding mode, and a pressure equalizing pipe is communicated between every two vertically-adjacent cavities. And a valve, a buffer component and a throttling component are arranged on the pressure equalizing pipe. The preparation method comprises the following steps: crushing and grinding raw materials to obtain powder; filling the powder into an elastic mold and sealing; the elastic mold is put into an isostatic pressing machine for isostatic pressing forming; sequentially carrying out primary roasting, dipping, secondary roasting, graphitization and cooling on the formed material to obtain isostatic pressing graphite; and after graphite is cleaned and dried, graphene coating is sprayed and cured. The production efficiency of isostatic pressing graphite is improved by improving the working efficiency of the isostatic pressing machine.

Description

Technical Field

[0001] The invention relates to the technical field of presses, and in particular to a high thermal conductivity isostatic graphite preparation system and preparation method. Background Art

[0002] Isostatic graphite refers to special graphite formed by isostatic pressing technology. It is not only widely used in civilian applications, but also occupies an important position in the forefront of national defense. It is a new type of material that attracts much attention. It is also an irreplaceable material for manufacturing single crystal furnaces, metal continuous casting graphite crystallizers, graphite electrodes for electrospark machining, etc. It is also an excellent material for manufacturing rocket nozzles, deceleration materials and reflective materials for graphite reactors.

[0003] In the prior art, when an isostatic press is pressing graphite, the isostatic press cannot operate during the process due to the long loading and unloading time, resulting in less effective working hours for the equipment. In addition, the pressurization time after the graphite is loaded into the isostatic press and the pressure relief time before the isostatic press takes out the graphite are both long, which further leads to low operating efficiency of the isostatic press and affects the production efficiency of isostatic pressed graphite. Summary of the invention

[0004] The purpose of the present invention is to develop a high thermal conductivity isostatic graphite preparation system and preparation method which can improve the production efficiency of isostatic graphite by improving the working efficiency of an isostatic press.

[0005] The present invention is achieved through the following technical solutions: A high thermal conductivity isostatic graphite preparation system, comprising: A feeding device and an isostatic press, wherein the feeding device feeds the elastic mold of the isostatic press, and the feeding device comprises a feeding mechanism, a pressing mechanism and a capping mechanism; The feeding mechanism comprises a support, on which a universal ball that can roll arbitrarily is movably arranged, a driving assembly for driving the universal ball to rotate is arranged in the support, a feeding pipe is passed through the universal ball, and a vibrating rod is connected to the bottom of the universal ball; The material pressing mechanism comprises a pressing plate, a vacuum tube connected to a vacuum system is provided on the top of the pressing plate, and a second vibration assembly is provided on the bottom of the pressing plate; The capping mechanism comprises a pipe rack, on which a plurality of support pipes are rotatably arranged, the tops of the support pipes are connected with suction nozzles, and the pipe rack is provided with a vacuum hose connected with the support pipes, and the vacuum hose is connected with a vacuum system; The isostatic press includes a high-pressure container, which is divided into multiple chambers from top to bottom. The chambers are rectangular in shape. A pressurization and pressure relief system for controlling the pressure rise and fall of the chambers is provided on the side of the chambers. A plug plate is slidably provided between two upper and lower adjacent chambers. A pressure equalizing pipe is connected between the two upper and lower adjacent chambers. A valve, a buffer component and a throttling component are provided on the pressure equalizing pipe.

[0006] Optionally, an upper pressure cover is provided on the top of the high-pressure container, a side cavity is provided at the bottom of the high-pressure container, the side cavity is communicated with the bottommost chamber, and a lower pressure cover is provided on the top of the side cavity; A plate shell for accommodating the sliding in and out of the plug plate is provided on the high-pressure container outside the plug plate, a hydraulic cylinder for driving the plug plate to slide is provided on the plate shell, and a plate groove for slidingly sealing with the edge of the plug plate is provided on the inner wall of the high-pressure container; A vertically arranged push plate is provided in the chamber at the bottom, and a hydraulic cylinder for driving the push plate to slide is provided outside the high-pressure container on the side of the push plate.

[0007] Optionally, the vibrating rod is arranged in parallel with the feeding pipe, and the vibrating rod head provided at the end of the vibrating rod is lower than the end of the feeding pipe; The driving assembly includes a driving ring arranged on the outside of the universal ball, the driving ring is horizontally rotatable in the support, the inner wall of the driving ring is in rolling contact with the outer wall of the universal ball, an outer ring gear is arranged on the outer ring wall of the driving ring, a transmission-connected motor and gear are arranged at corresponding positions in the support, the gear is meshed with the outer ring gear, a driving groove is vertically opened on the outer wall of the universal ball, an arc-shaped rack of corresponding shape is arranged in the driving groove, a driving gear meshed with the rack is arranged in the driving groove, the driving gear is rotatably arranged on the driving ring, and a micromotor transmission-connected to the driving gear is correspondingly arranged on the driving ring.

[0008] Optionally, the shape of the pressing plate is adapted to the internal cavity of the elastic mold, a sealing ring made of elastic material is provided at the edge of the pressing plate, the nozzle of the vacuum tube extends to the bottom of the pressing plate, the second vibration component at the nozzle of the vacuum tube corresponds to the opening, and a filtering structure is provided in the nozzle of the vacuum tube at the bottom of the pressing plate to prevent materials from being drawn in.

[0009] Optionally, the capping mechanism also includes a suction cup, the shape of the tube rack is the same as the shape of the outer wall of the elastic mold and is larger in size, a plurality of the support tubes are arranged on the tube rack at equal intervals, the bottom end of the support tube is rotatably connected to the tube rack, a micromotor for driving the support tube to swing is provided on the tube rack, and a filtering structure is provided in the suction nozzle to prevent materials from being sucked in.

[0010] A method for preparing a high thermal conductivity isostatic graphite preparation system comprises the following steps: S1. The raw materials are crushed, ground and kneaded, and then crushed and ground for the second time to obtain a powder; S2. The powder is loaded into the elastic mold from bottom to top several times through the feeding mechanism, and the powder is compacted in the elastic mold by the pressing mechanism after each loading; S3. The top cover is covered on the elastic mold by the capping mechanism, and then the top cover and the elastic mold are bundled to achieve sealing; S4. The elastic mold is placed in an isostatic press for isostatic pressing; S5. The elastic mold is removed and the molding material is removed, and then the primary calcination, impregnation, secondary calcination, graphitization, and cooling are performed in sequence to obtain isostatic graphite; S6. Cleaning and drying the isostatic graphite; S7. Spraying and curing the graphite surface with graphene coating to obtain high thermal conductivity isostatic graphite; The elastic mold is placed from the top of the isostatic press, and the elastic mold passes through multiple chambers in the isostatic press from top to bottom; The chamber inside the isostatic press has working pressure and conveying pressure. The working pressure is the pressure when the chamber is closed, and the conveying pressure is the pressure when the chamber is connected to the adjacent chamber for transferring the elastic mold. The multiple chambers are A1, A2...Am...An-1, An from top to bottom, among which A1 is at the top and An is at the bottom. The internal working pressure from A1 to Am gradually increases, and the internal working pressure from Am to An gradually decreases. The working pressure of Am is the largest, and the material is isostatically formed in Am. The working pressures of A1 and An are normal pressure. Under working pressure, A1 and An can be opened to put in or take out the elastic mold.

[0011] Optionally, when the elastic mold moves downward in the isostatic press, the elastic mold in the bottommost chamber is moved out of the isostatic press, and then the plug plate at the top of the bottommost chamber is opened to allow the elastic mold in the upper chamber to fall into the bottommost chamber, and then the plug plate at the top of the bottommost chamber is closed, and the chambers above the bottommost chamber repeat the above process in sequence, so that the elastic molds in each chamber descend one by one into the lower chamber, and after the elastic mold in the topmost chamber moves down, a new elastic mold filled with material is placed in; When the elastic mold is transferred between the two adjacent chambers, the valve of the pressure equalizing pipe between the two chambers is opened, the two chambers are connected and pressure-equalized, the plug plate between the two chambers is opened, the elastic modulus falls into the lower chamber, the valve of the pressure equalizing pipe is closed, the plug plate is closed, the two chambers are sealed, and then the pressure in the chamber reaches the working pressure through the boosting or pressure relief system.

[0012] Optionally, in step S2, the process of each loading of the feeding mechanism includes: the feeding pipe and the vibrating rod are extended into the elastic mold, the feeding pipe is fed, and the vibrating rod is vibrated. At the same time, the end of the feeding pipe starts from the inner wall of the elastic mold, and performs multiple circular movements from the outside to the inside step by step. The trajectory of the circular movement is adapted to the internal shape of the elastic mold, and the trajectories of the multiple circular movements gradually shrink from the outside to the inside. The coverage area of ​​the multiple circular movements covers the cross-section of the elastic mold. Each circular movement is repeated at least twice. After the loading is completed, the feeding mechanism withdraws the elastic mold, and the pressing mechanism compacts the material in the elastic mold before the next loading. The loading and pressing are performed alternately until the elastic mold is filled with material.

[0013] Optionally, in step S2, when the pressing mechanism is pressing the material, the pressing plate enters the elastic mold and descends to compact the material. During this process, the second vibration component vibrates, and the vacuum tube is evacuated to exhaust the air in the material and compact the material. After the pressing is completed, the pressing plate is withdrawn from the elastic mold.

[0014] Optionally, in step S3, the tube rack of the capping mechanism is located below the top cover, and the support tube on the tube rack swings inward at a certain angle and enters the inner side of the top cover side wall from the bottom of the top cover, and multiple support tubes open the bottom of the top cover so that the opening of the top cover gradually increases from top to bottom, and the top cover enters the opening of the elastic mold along the tube rack, and the top cover is pressed into the opening of the elastic mold until the top of the top cover covers the elastic mold. During this process, the suction nozzle performs vacuum extraction to discharge the air on the upper part of the elastic mold. After the top of the top cover covers the elastic mold, the tube rack starts to descend, and the suction nozzle still maintains vacuum extraction during the descent. After the support tube and the suction nozzle descend, the side wall of the top cover is tightly attached to the top side wall of the elastic mold. After the suction nozzle and the support tube descend and completely detach from the top cover, the top cover is tightly attached to the elastic mold due to its elasticity, and the tube rack rises and evacuates from the outside of the elastic mold.

[0015] The beneficial effects of the present invention are: When the isostatic press is loaded at the top and discharged at the bottom, the graphite is continuously pressed inside. The loading and discharging behavior does not hinder the pressing of graphite, which improves the working efficiency of the isostatic press and the production efficiency of isostatic graphite. The pressure in the chamber of the isostatic press gradually increases and decreases, the pressure difference between two adjacent chambers is relatively small, the one-way pressure on the plug between the two adjacent chambers is also relatively small, the pressure resistance requirement of the plug is relatively low, and the structural life and sealing effect are extended; Each chamber maintains a certain pressure, and its pressurization and pressure relief range is relatively small. The workload of the pressurization and pressure relief system is low, its service life is increased, the failure rate is reduced, and the time for pressurization and pressure relief is relatively short. The time for graphite to wait for pressurization and pressure relief is short, and the graphite production efficiency is improved. In addition, the pressure of multiple chambers is gradually increased and decreased, and the graphite can be evenly pressed and deformed, which is helpful to obtain graphite with fine structure, dense structure and good uniformity. When the material in the elastic mold is filled, compacted and capped, it is carried out through the feeding mechanism, the pressing mechanism and the capping mechanism, which not only improves the working efficiency, shortens the filling time of the elastic mold, improves the production efficiency of isostatic graphite, and the filling of the equipment is consistent, and the compaction uniformity of the filling is controllable, which is not affected by factors such as manual operation technology and experience; When feeding the material into the elastic mold, the feeding mechanism performs multiple circular movements and fills and vibrates the material, so that the material is evenly filled in the elastic mold without any gaps. The material is filled multiple times and after each filling, the pressing mechanism presses and vacuumizes the filled material to further improve the compactness of the material in the elastic mold. After the material is filled, the capping mechanism automatically covers the top cover on the elastic mold, and vacuumizes during the process, further improving the compactness of the material in the elastic mold and the sealing performance between the top cover and the elastic mold. The graphene coating on the outside of isostatic graphite not only serves as a protective structure to improve the durability and corrosion resistance of graphite, but also improves the thermal conductivity of graphite. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the feeding device; Figure 2 is a schematic diagram of the structure of the drive component; Figure 3 for Figure 2 A top view of Figure 4 It is a structural schematic diagram of the pressing mechanism; Figure 5 It is a structural schematic diagram of the capping mechanism; Figure 6 It is a schematic diagram of the structure of an isostatic press.

[0018] Figure numerals: 100, feeding device; 110, feeding seat; 120, first vibration assembly; 130, feeding mechanism; 131, support; 132, universal ball; 133, feeding pipe; 134, vibrating rod; 135, driving groove; 136, rack; 137, driving gear; 138, driving ring; 140, pressing mechanism; 141, pressing plate; 142, vacuum tube; 143, second Vibration assembly; 150, capping mechanism; 151, suction cup; 152, pipe rack; 153, support pipe; 154, suction nozzle; 200, isostatic press; 210, elastic mold; 211, top cover; 220, metal sleeve; 230, high-pressure container; 231, chamber; 232, upper pressure cover; 233, lower pressure cover; 234, side cavity; 240, plug plate; 250, equalizing pressure tube; 260, push plate. DETAILED DESCRIPTION

[0019] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 to Figure 6 As shown, the present invention discloses a high thermal conductivity isostatic graphite preparation system, including a feeding device 100 and an isostatic press 200, wherein the feeding device 100 includes a feeding seat 110, wherein the feeding seat 110 is provided with a seat groove, wherein a first vibration assembly 120 is provided at the bottom of the seat groove, and an elastic layer is provided on the inner wall of the seat groove. The seat groove accommodates a perforated metal sleeve 220 of the isostatic press 200, wherein the metal sleeve 220 is provided with an elastic mold 210.

[0023] The elastic layer is a layer of elastic air cushion made of rubber material. The first vibration component 120 includes an elastic cushion layer arranged on the bottom surface of the seat groove. A plurality of ultrasonic transducers are arranged at the bottom of the elastic cushion layer. The ultrasonic transducers are electrically connected to the ultrasonic generator. The metal sleeve 220 is placed on the elastic cushion layer. The high-frequency oscillation signal emitted by the ultrasonic generator is converted into high-frequency mechanical oscillation by the ultrasonic transducer to vibrate the metal sleeve 220. The elastic layer and the elastic cushion layer prevent the metal sleeve 220 from rigidly contacting the inside of the loading seat 110.

[0024] A feeding mechanism 130 , a pressing mechanism 140 and a capping mechanism 150 are provided above the loading seat 110 . The feeding mechanism 130 fills the material into the elastic mold 210 , the pressing mechanism 140 compacts the material in the elastic mold 210 , and the capping mechanism 150 installs the top cover 211 of the elastic mold 210 .

[0025] The feeding mechanism 130 includes a support 131 that can move in three directions. A universal ball 132 that can roll arbitrarily is movably provided on the support 131. A portion of the universal ball 132 is exposed at the top and bottom of the support 131. A ball groove is correspondingly provided in the support 131 for accommodating the universal ball 132 and in rolling contact with the universal ball 132. The support 131 supports the universal ball 132 through the ball groove.

[0026] A feeding pipe 133 is provided on the universal ball 132 , and the feeding pipe 133 passes through the universal ball 132 . A vibrating rod 134 is provided on the universal ball 132 at the lower part of the support 131 , and the vibrating rod 134 is arranged parallel to the feeding pipe 133 . A vibrating rod head is provided at the end of the vibrating rod 134 , and the vibrating rod head is lower than the end of the feeding pipe 133 .

[0027] A driving assembly for driving the universal ball 132 to rotate is provided in the support 131. The driving assembly includes a driving ring 138 provided on the outside of the universal ball 132. The driving ring 138 is provided in the support 131 for horizontal rotation. The inner wall of the driving ring 138 is in rolling contact with the outer wall of the universal ball 132. An outer ring gear is provided on the outer ring wall of the driving ring 138. A motor and a gear connected in transmission are provided at corresponding positions in the support 131. The gear is meshed with the outer ring gear. A driving groove 135 is vertically provided on the outer wall of the universal ball 132. An arc-shaped rack 136 of corresponding shape is provided in the driving groove 135. A driving gear 137 meshed with the rack 136 is provided in the driving groove 135. The driving gear 137 is rotatably provided on the driving ring 138. A micro motor connected in transmission with the driving gear 137 is provided on the driving ring 138. Since the driving gear 137 is in the driving slot 135 and meshes with the rack 136, when the driving ring 138 rotates horizontally, the driving gear 137 will push the driving slot 135 to drive the universal ball 132 to rotate horizontally synchronously. The micromotor drives the driving gear 137 to rotate, and the driving gear 137 drives the rack 136 to make the universal ball 132 rotate vertically in the driving ring 138.

[0028] When the feeding mechanism 130 is feeding, the universal ball 132 is located above the elastic mold 210 and the two are in a coaxial state. The feeding pipe 133 and the vibrating rod 134 are inserted into the elastic mold 210. When the feeding pipe 133 is feeding, the universal ball 132 rotates to drive the feeding pipe 133 to rotate in the elastic mold 210, so that the material output by the feeding pipe 133 falls into the elastic mold 210 along a circular trajectory. The universal ball 132 can be rotated in the vertical direction to adjust the angle, so that the diameter of the circular trajectory of the feeding pipe 133 outlet movement increases or decreases and the circular trajectory remains in a coaxial state with the elastic mold 210. By drawing circles multiple times at the feeding pipe 133 outlet and changing the diameter of the circles, the material output by the feeding pipe 133 can evenly fill the elastic mold 210. In this process, the vibrating rod head at the end of the vibrating rod 134 vibrates the output material to fill the material without large gaps. When the universal ball 132 rotates to drive the feed tube 133 to move, the vertical rotation angle of the universal ball 132 is controlled to control the inclination angle of the feed tube 133, thereby controlling the distance between the outlet of the feed tube 133 and the axis of the universal ball 132. The projection of the swing trajectory of the outlet of the feed tube 133 in the horizontal plane can be a rectangle to adapt to the rectangular elastic mold 210.

[0029] The material pressing mechanism 140 includes a pressing plate 141 that can move in three directions. The shape of the pressing plate 141 is adapted to the internal cavity of the elastic mold 210. A sealing ring made of elastic material is provided at the edge of the pressing plate 141. A second vibration component 143 having the same structure as the first vibration component 120 is provided at the bottom of the pressing plate 141. A vacuum tube 142 is provided at the top of the pressing plate 141. The nozzle of the vacuum tube 142 extends to the bottom of the pressing plate 141. The second vibration component 143 at the nozzle corresponds to the opening. The vacuum tube 142 is connected to the vacuum system. A filtering structure is provided in the nozzle of the vacuum tube 142 at the bottom of the pressing plate 141 to prevent materials from being sucked in.

[0030] When the pressing mechanism 140 presses the material, the pressing plate 141 is in a coaxial state with the elastic mold 210 and then descends into the elastic mold 210. The pressing plate 141 presses the material in the elastic mold 210. During this process, the second vibration component 143 vibrates and the vacuum tube 142 draws a vacuum to compact the material and extract the air in the material to increase the compaction degree. After compacting the material, the pressing plate 141 rises and separates from the elastic mold 210.

[0031] The capping mechanism 150 includes a three-way movable suction cup 151 and a three-way movable pipe rack 152. The suction cup 151 is used to suck the top cover 211 of the elastic mold 210 and move it. The shape of the pipe rack 152 is the same as the shape of the outer wall of the elastic mold 210 and is larger in size, so that the pipe rack 152 can be raised and lowered at will outside the elastic mold 210. A plurality of support pipes 153 are arranged at equal intervals on the pipe rack 152. The bottom end of the support pipe 153 is rotatably connected to the pipe rack 152. The pipe rack 152 is provided with a micro motor for driving the support pipe 153 to swing. The top of the support pipe 153 is connected to a suction nozzle 154. The suction nozzle 154 is also provided with a filtering structure to prevent materials from being sucked in. A vacuum hose connected to the support pipe 153 is correspondingly provided on the pipe rack 152, and the vacuum hose is connected to the vacuum system.

[0032] After the suction cup 151 sucks the top cover 211, the pipe rack 152 enters the bottom of the top cover 211, and the multiple support pipes 153 are tilted inward. If the top cover 211 is a circular cover, the multiple support pipes 153 tilt inward to form a truncated cone, and the diameter of the top of the truncated cone is adapted to the inner diameter of the top cover 211. If the top cover 211 is a rectangular cover, the multiple support pipes 153 tilt inward to form a quadrangular cone, and the rectangular top of the quadrangular cone is adapted to the multiple inner tops. After the multiple support pipes 153 tilt inward, the pipe rack 152 rises so that the top ends of the multiple support pipes 153 are inserted upward from the inner wall of the bottom of the top cover 211 to the inner top of the top cover 211. The multiple support pipes 153 open the side wall of the top cover 211. At this time, the size of the side wall of the top cover 211 gradually increases from top to bottom, which is convenient for the top cover 211 to cover the elastic mold 210. The suction cup 151 and the tube rack 152 move synchronously to cover the top cover 211 on the top of the elastic mold 210. During this process, the suction nozzle 154 performs suction to suck away the air between the top cover 211 and the top of the elastic mold 210 to reduce the residual air inside the elastic mold 210. After the top cover 211 is covered on the elastic mold 210, the suction cup 151 is fixed, and the tube rack 152 descends to drive the multiple support tubes 153 to descend. During the descent of the support tubes 153, the suction nozzle 154 is kept sucking, and the side wall of the top cover 211 that is out of contact with the top of the support tube 153 is reset under elasticity and tightly attached to the top side wall of the elastic mold 210. The suction nozzle 154 sucks the air between them, so that the air between the side wall of the top cover 211 and the top side wall of the elastic mold 210 is sucked away, and the two can be tightly fitted and sealed. After the support tube 153 descends and completely separates from the top cover 211, the support tube 153 swings to a vertical state to be reset, and the tube rack 152 rises and separates from the outside of the elastic mold 210.

[0033] The isostatic press 200 includes a high-pressure container 230, which is divided into a plurality of chambers 231 from top to bottom. The chambers 231 are in the shape of a rectangular parallelepiped. The internal pressure of the plurality of chambers 231 gradually increases and then gradually decreases from top to bottom. A pressurization and pressure relief system for controlling the pressure rise and fall is provided on the side of each chamber 231. An upper pressure cover 232 is provided on the top of the high-pressure container 230, and the upper pressure cover 232 is also located at the top of the chamber 231 at the top. A side chamber 234 is provided at the bottom of the high-pressure container 230, and the side chamber 234 is connected to the chamber 231 at the bottom. A lower pressure cover 233 is provided on the top of the side chamber 234.

[0034] A plug plate 240 that can slide horizontally is provided between two upper and lower adjacent chambers 231, a plate shell that accommodates the plug plate 240 to slide in and out is provided on the high-pressure container 230 outside the plug plate 240, a hydraulic cylinder that drives the plug plate 240 to slide is provided on the plate shell, and a plate groove that is slidably sealed with the edge of the plug plate 240 is provided on the inner wall of the high-pressure container 230. The hydraulic cylinder drives the plug plate 240 to slide from the plate shell into the high-pressure container 230, so that the upper and lower chambers 231 of the plug plate 240 can be sealed, and the hydraulic cylinder drives the plug plate 240 to slide into the plate shell, so that the upper and lower chambers 231 can be connected.

[0035] The two upper and lower adjacent chambers 231 are connected by a pressure equalizing pipe 250 , on which a valve, a buffer component and a throttling component are provided.

[0036] A vertically arranged push plate 260 is provided in the bottom chamber 231, and a hydraulic cylinder is provided outside the high pressure container 230 on the side of the push plate 260 to drive the push plate 260 to slide. The hydraulic cylinder drives the push plate 260 to slide toward the side cavity 234, and the push plate 260 can push the elastic mold 210 into the side cavity 234.

[0037] The present invention also discloses a method for preparing the high thermal conductivity isostatic graphite preparation system, comprising the following steps: S1. The raw materials are crushed, ground and kneaded, and then crushed and ground for the second time to obtain a powder; S2. The powder is loaded into the elastic mold 210 from bottom to top several times by the feeding mechanism 130, and the powder is compacted in the elastic mold 210 by the pressing mechanism 140 after each loading; S3. The top cover 211 is covered on the elastic mold 210 by the capping mechanism 150, and then the top cover 211 and the elastic mold 210 are bundled to achieve sealing; S4. The elastic mold 210 is placed in the isostatic press 200 for isostatic pressing; S5. The elastic mold 210 is removed and the molding material is removed, and then the primary calcination, impregnation, secondary calcination, graphitization, and cooling are performed in sequence to obtain isostatic graphite; S6. Cleaning and drying the isostatic graphite; S7. Spraying and curing the graphite surface with graphene coating to obtain high thermal conductivity isostatic graphite; In step S2, the elastic mold 210 is placed in the perforated metal sleeve 220, the metal sleeve 220 is placed in the seat groove of the loading seat 110, and the first vibration component 120 at the bottom of the seat groove vibrates to keep the metal sleeve 220 and the elastic mold 210 vibrating during the loading process. In step S3, after the top cover 211 and the elastic mold 210 are bundled, the cover of the metal sleeve 220 is covered and fixed; In step S2, the process of each loading of the feeding mechanism 130 includes: the feeding pipe 133 and the vibrating rod 134 extend into the elastic mold 210, the feeding pipe 133 feeds, and the vibrating rod 134 vibrates. At the same time, the end of the feeding pipe 133 starts from the inner wall of the elastic mold 210 and performs multiple circular movements from the outside to the inside step by step. The trajectory of the circular movement is adapted to the internal shape of the elastic mold 210, and the trajectories of the multiple circular movements gradually shrink from the outside to the inside. The coverage area of ​​the multiple circular movements covers most of or the entire cross-section of the elastic mold 210. Each circular movement is repeated at least twice. After the loading is completed, the feeding mechanism 130 withdraws from the elastic mold 210, and the pressing mechanism 140 compacts the material in the elastic mold 210 before the next loading. The loading and pressing are performed alternately until the elastic mold 210 is filled with material. In step S2, when the pressing mechanism 140 is pressing the material, the pressing plate 141 enters the elastic mold 210 and descends to compact the material. During this process, the second vibration component 143 vibrates, and the vacuum tube 142 is evacuated to exhaust the air in the material and compact the material. After the pressing is completed, the pressing plate 141 is withdrawn from the elastic mold 210. In step S3, the tube rack 152 of the capping mechanism 150 is located below the top cover 211, and the support tube 153 on the tube rack 152 swings inward at a certain angle and enters the inner side of the side wall of the top cover 211 from the bottom of the top cover 211. The multiple support tubes 153 open the bottom of the top cover 211, so that the opening of the top cover 211 gradually increases from top to bottom. The top cover 211 enters the opening of the elastic mold 210 along with the tube rack 152, and the top cover 211 is pressed into the opening of the elastic mold 210 until the top of the top cover 211 covers the elastic mold 210. In this process, the suction nozzle 154 is vacuumed to exhaust the air on the upper part of the elastic mold 210 as much as possible, so that the top cover 211 is tightly covered on the elastic mold 210. While the top cover 211 is on the mold 210, the air retained between the top cover 211 and the elastic mold 210 is reduced. After the top cover 211 covers the elastic mold 210, the pipe rack 152 begins to descend. During the descent, the suction nozzle 154 still maintains vacuum. After the support tube 153 and the suction nozzle 154 descend, the elasticity of the top cover 211 makes its side wall close to the top side wall of the elastic mold 210. The suction of the suction nozzle 154 reduces the air between the two, so that the two are close to each other to achieve sealing. After the suction nozzle 154 and the support tube 153 descend and completely separate from the top cover 211, the top cover 211 is tightly attached to the elastic mold 210 due to its elasticity, and the pipe rack 152 rises and evacuates the outside of the elastic mold 210. The elastic mold 210 is placed from the top of the isostatic press 200, and the elastic mold 210 passes through multiple chambers 231 from top to bottom in the isostatic press 200. When the elastic mold 210 moves downward in the isostatic press 200, the elastic mold 210 in the bottom chamber 231 is moved out of the isostatic press 200, and then the plug plate 240 at the top of the bottom chamber 231 is opened to allow the elastic mold 210 in the previous chamber 231 to fall into the bottom chamber 231, and then the plug plate 240 at the top of the bottom chamber 231 is closed, and the chambers 231 above the bottom chamber 231 repeat the above process in sequence, so that the elastic mold 210 in each chamber 231 descends one by one into the lower chamber 231, and after the elastic mold 210 in the top chamber 231 moves down, a new elastic mold 210 filled with material is placed; The chamber 231 inside the isostatic press 200 has a working pressure and a conveying pressure. The working pressure is the pressure when the chamber 231 is sealed, and the conveying pressure is the pressure when the chamber 231 is connected with the adjacent chamber 231 for transferring the elastic mold 210. The multiple chambers 231 are A1, A2...Am...An-1, An from top to bottom, wherein A1 is at the top and An is at the bottom. The internal working pressure from A1 to Am gradually increases, and the internal working pressure from Am to An gradually decreases. The working pressure of Am is the largest, and the material is mainly isostatically molded in Am. The working pressures of A1 and An are normal pressure. Under the working pressure, A1 and An can be opened to put in or take out the elastic mold 210; When the elastic mold 210 is transferred between the two adjacent chambers 231, the valve of the pressure equalizing pipe 250 between the two chambers 231 is opened, the two chambers 231 are connected and pressure equalized, the plug plate 240 between the two chambers 231 is opened, the elastic modulus falls into the lower chamber 231, the valve of the pressure equalizing pipe 250 is closed, the plug plate 240 is closed, the two chambers 231 are sealed, and then the pressure in the chamber 231 reaches the working pressure through the pressurization or pressure relief system; In step S6, when cleaning the graphite, the graphite is firstly cleaned with graphite and then cleaned with dry ice.

[0038] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A high thermal conductivity isostatic graphite preparation system, characterized in that: include: A feeding device and an isostatic press, wherein the feeding device feeds the elastic mold of the isostatic press, and the feeding device comprises a feeding mechanism, a pressing mechanism and a capping mechanism; The feeding mechanism comprises a support, on which a universal ball that can roll arbitrarily is movably arranged, a driving assembly for driving the universal ball to rotate is arranged in the support, a feeding pipe is passed through the universal ball, and a vibrating rod is connected to the bottom of the universal ball; The material pressing mechanism comprises a pressing plate, a vacuum tube connected to a vacuum system is provided on the top of the pressing plate, and a second vibration assembly is provided on the bottom of the pressing plate; The capping mechanism comprises a pipe rack, on which a plurality of support pipes are rotatably arranged, the tops of the support pipes are connected with suction nozzles, and the pipe rack is provided with a vacuum hose connected with the support pipes, and the vacuum hose is connected with a vacuum system; The isostatic press includes a high-pressure container, which is divided into multiple chambers from top to bottom. The chambers are rectangular in shape. A pressurization and pressure relief system for controlling the pressure rise and fall of the chambers is provided on the side of the chambers. A plug plate is slidably provided between two upper and lower adjacent chambers. A pressure equalizing pipe is connected between the two upper and lower adjacent chambers. A valve, a buffer component and a throttling component are provided on the pressure equalizing pipe.

2. The high thermal conductivity isostatic graphite preparation system according to claim 1, characterized in that: An upper pressure cover is provided on the top of the high-pressure container, a side cavity is provided at the bottom of the high-pressure container, the side cavity is communicated with the bottommost cavity, and a lower pressure cover is provided on the top of the side cavity; A plate shell for accommodating the sliding in and out of the plug plate is provided on the high-pressure container outside the plug plate, a hydraulic cylinder for driving the plug plate to slide is provided on the plate shell, and a plate groove for slidingly sealing with the edge of the plug plate is provided on the inner wall of the high-pressure container; A vertically arranged push plate is provided in the chamber at the bottom, and a hydraulic cylinder for driving the push plate to slide is provided outside the high-pressure container on the side of the push plate.

3. The high thermal conductivity isostatic graphite preparation system according to claim 1, characterized in that: The vibrating rod is arranged in parallel with the feeding pipe, and the vibrating rod head provided at the end of the vibrating rod is lower than the end of the feeding pipe; The driving assembly includes a driving ring arranged on the outside of the universal ball, the driving ring is horizontally rotatable in the support, the inner wall of the driving ring is in rolling contact with the outer wall of the universal ball, an outer ring gear is arranged on the outer ring wall of the driving ring, a transmission-connected motor and gear are arranged at corresponding positions in the support, the gear is meshed with the outer ring gear, a driving groove is vertically opened on the outer wall of the universal ball, an arc-shaped rack of corresponding shape is arranged in the driving groove, a driving gear meshed with the rack is arranged in the driving groove, the driving gear is rotatably arranged on the driving ring, and a micromotor transmission-connected to the driving gear is correspondingly arranged on the driving ring.

4. The high thermal conductivity isostatic graphite preparation system according to claim 1, characterized in that: The shape of the pressing plate is adapted to the internal cavity of the elastic mold, a sealing ring made of elastic material is provided at the edge of the pressing plate, the nozzle of the vacuum tube extends to the bottom of the pressing plate, the second vibration component at the nozzle of the vacuum tube corresponds to the opening, and a filtering structure is provided in the nozzle of the vacuum tube at the bottom of the pressing plate to prevent materials from being drawn in.

5. The high thermal conductivity isostatic graphite preparation system according to claim 1, characterized in that: The capping mechanism also includes a suction cup. The shape of the tube rack is the same as that of the outer wall of the elastic mold and is larger in size. A plurality of support tubes are arranged on the tube rack at equal intervals. The bottom end of the support tube is rotatably connected to the tube rack. A micromotor is provided on the tube rack to drive the support tube to swing. A filtering structure is provided in the suction nozzle to prevent materials from being sucked in.

6. A method for preparing a high thermal conductivity isostatic graphite preparation system according to any one of claims 1 to 5, characterized in that: The steps include: S1. The raw materials are crushed, ground and kneaded, and then crushed and ground for the second time to obtain a powder; S2. The powder is loaded into the elastic mold from bottom to top several times through the feeding mechanism, and the powder is compacted in the elastic mold by the pressing mechanism after each loading; S3. The top cover is covered on the elastic mold by the capping mechanism, and then the top cover and the elastic mold are bundled to achieve sealing; S4. The elastic mold is placed in an isostatic press for isostatic pressing; S5. The elastic mold is removed and the molding material is removed, and then the primary calcination, impregnation, secondary calcination, graphitization, and cooling are performed in sequence to obtain isostatic graphite; S6. Cleaning and drying the isostatic graphite; S7. Spraying and curing the graphite surface with graphene coating to obtain high thermal conductivity isostatic graphite; The elastic mold is placed from the top of the isostatic press, and the elastic mold passes through multiple chambers in the isostatic press from top to bottom; The chamber inside the isostatic press has working pressure and delivery pressure. The working pressure is the pressure when the chamber is closed, and the delivery pressure is the pressure when the chamber is connected to the adjacent chamber for the transfer of the elastic mold. The multiple chambers are A1, A2...A from top to bottom. m ……A n-1 , A n , where A1 is at the top and A n At the bottom, A1 to A m The internal working pressure gradually increases. m To A n The internal working pressure of A gradually decreases. m The working pressure is the largest, and the material is in A m Medium static pressure forming, A1 and A n The working pressure is normal pressure. Under working pressure, A1 and A n Can be opened to put in or take out the elastic mold.

7. The method for preparing a high thermal conductivity isostatic graphite preparation system according to claim 6, characterized in that: When the elastic mold moves downward in the isostatic press, the elastic mold in the bottom chamber is moved out of the isostatic press, and then the plug plate at the top of the bottom chamber is opened to allow the elastic mold in the upper chamber to fall into the bottom chamber, and then the plug plate at the top of the bottom chamber is closed, and the chambers above the bottom chamber repeat the above process in sequence, so that the elastic molds in each chamber are lowered one by one into the lower chamber, and after the elastic mold in the top chamber moves down, a new elastic mold containing materials is placed in; When the elastic mold is transferred between the two adjacent chambers, the valve of the pressure equalizing pipe between the two chambers is opened, the two chambers are connected and pressure-equalized, the plug plate between the two chambers is opened, the elastic modulus falls into the lower chamber, the valve of the pressure equalizing pipe is closed, the plug plate is closed, the two chambers are sealed, and then the pressure in the chamber reaches the working pressure through the boosting or pressure relief system.

8. The method for preparing a high thermal conductivity isostatic graphite preparation system according to claim 6, characterized in that: In step S2, the process of each loading of the feeding mechanism includes: the feeding pipe and the vibrating rod are extended into the elastic mold, the feeding pipe is fed, and the vibrating rod is vibrated. At the same time, the end of the feeding pipe starts from the inner wall of the elastic mold and performs multiple circular movements from the outside to the inside step by step. The trajectory of the circular movement is adapted to the internal shape of the elastic mold, and the trajectories of the multiple circular movements gradually shrink from the outside to the inside. The coverage area of ​​the multiple circular movements covers the cross-section of the elastic mold. Each circular movement is repeated at least twice. After the loading is completed, the feeding mechanism withdraws from the elastic mold, and the pressing mechanism compacts the material in the elastic mold before the next loading. The loading and pressing are performed alternately until the elastic mold is filled with material.

9. The method for preparing a high thermal conductivity isostatic graphite preparation system according to claim 6, characterized in that: In step S2, when the pressing mechanism is pressing the material, the pressing plate enters the elastic mold and descends to compact the material. During this process, the second vibration component vibrates, and the vacuum tube is evacuated to exhaust the air in the material and compact the material. After the pressing is completed, the pressing plate is withdrawn from the elastic mold.

10. The method for preparing a high thermal conductivity isostatic graphite preparation system according to claim 6, characterized in that: In the step S3, the pipe rack of the capping mechanism is located below the top cover, and the support pipe on the pipe rack swings inwards at a certain angle and then enters the inner side of the top cover side wall from the bottom of the top cover, and multiple support pipes open the bottom of the top cover so that the opening of the top cover gradually increases from top to bottom, and the top cover enters the opening of the elastic mold along with the pipe rack, and the top cover is pressed into the opening of the elastic mold until the top of the top cover covers the elastic mold. During this process, the suction nozzle performs vacuuming to discharge the air on the upper part of the elastic mold. After the top of the top cover covers the elastic mold, the pipe rack starts to descend, and the suction nozzle still maintains vacuuming during the descent. After the support pipe and the suction nozzle descend, the side wall of the top cover is tightly attached to the top side wall of the elastic mold. After the suction nozzle and the support pipe descend and completely detach from the top cover, the top cover is tightly attached to the elastic mold due to elasticity, and the pipe rack rises and evacuates from the outside of the elastic mold.

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