Isostatic pressing graphite product graphitization treatment equipment and treatment process thereof

Abstract

The invention discloses an isostatic pressing graphite product graphitization treatment device and a treatment process thereof, and relates to the technical field of graphitization processes, the device comprises a graphitization furnace main body, a front cover, a rear cover, a gas inlet pipeline and a gas outlet pipeline; the heating furnace body is arranged in the graphitization furnace main body, the outer side of the heating furnace body is sleeved with a combined tool, and the combined tool is connected with the graphitization furnace main body in a matched mode; the induction coil is wound on the outer side of the heating furnace body; wherein the heating furnace body comprises a graphite lining, a heat insulation layer and a furnace shell located on the outer side, and a water cooling channel is formed in the furnace shell; the process comprises the following steps: step 1, preparing; step 2, heating; step 3, gradient cooling; step 4, taking materials and detecting; cooling water circulates in the water cooling channel, heat of the furnace shell and the induction coil is taken away, the induction coil is cooled, and passive heat blocking is converted into active heat exporting.

Description

Technical Field

[0001] The present invention relates to the technical field of graphitization processes, and particularly to an isostatic graphite product graphitization treatment device and its treatment process. Background Art

[0002] Isostatic graphite products, with their excellent high purity, isotropy, and outstanding thermal stability, play an irreplaceable role in cutting-edge scientific and technological fields such as photovoltaic single-crystalline silicon growth and nuclear reactor moderators. The quality of these core properties directly stems from the quality of the graphitization process. The graphitization process is a delicate process that drives the transformation of carbon atoms from disorder to a three-dimensional ordered lattice through high temperatures ranging from 1800°C to 3000°C. Among them, the stage where the temperature exceeds 2000°C is particularly crucial, as it marks a significant convergence of the interlayer spacing of graphite microcrystals and a leap in electrical conductivity. Therefore, the heating system of the graphitization furnace faces extremely strict performance requirements.

[0003] Currently, induction heating technology, as the mainstream heating solution, can efficiently achieve the goal of high-temperature generation. However, its core component - the induction coil - faces an undeniable risk of thermal runaway. In traditional designs, the induction coil is closely connected to the furnace shell, and the high temperature inside the furnace forms a "thermal short-circuit path from the furnace cavity to the furnace shell and then to the induction coil" through thermal radiation and possible residual heat conduction in the graphite felt insulation layer. In addition, the induction coil itself will generate resistive losses due to the skin effect under the action of alternating current. Coupled with the continuous input of external heat, the coil temperature rises rapidly, possibly reaching a high-temperature range of 400°C to 600°C.

[0004] This high-temperature environment not only leads to an increase in the resistivity of copper conductors but also causes carbonization failure of the insulation layer, thereby resulting in drift of the inductance value and deterioration of the system power factor, ultimately reducing the heating efficiency. To address the above problems, most existing technologies have adopted passive thermal protection strategies, such as filling multiple layers of graphite felt or ceramic fiber between the induction coil and the furnace shell to delay heat transfer, or replacing it with high-temperature-resistant materials (such as molybdenum alloy coils). However, these solutions all have significant drawbacks: on the one hand, the insulation material will undergo sintering shrinkage under the long-term action of high-temperature environments, resulting in a gradual decline in insulation performance; on the other hand, in the face of the high heat flux density inside the furnace, although the insulation layer can slow down the heating rate, it cannot fundamentally prevent the continuous rise of the coil temperature.

[0005] In view of the above dilemmas, there is an urgent need to develop a new isostatic graphite product graphitization treatment device and its treatment process to achieve a transformation from the traditional idea of "delaying heat transfer" to the innovative concept of "active heat conduction treatment", providing a more reliable technical guarantee for the ultra-high-temperature graphitization treatment of isostatic graphite products. Summary of the Invention

[0006] The object of the present invention is to provide a graphitization treatment device and a treatment process for isostatic pressing graphite products. By arranging a water cooling channel in the furnace shell inside the induction coil to actively cool the induction coil, the problem that the temperature rise of the induction coil during the heating process affects the heating efficiency is solved.

[0007] The object of the present invention can be achieved by the following technical solutions:

[0008] An isostatic pressing graphite product graphitization treatment device, comprising:

[0009] A graphitization furnace main body, a front cover and a rear cover;

[0010] An intake pipeline and an exhaust pipeline, the intake pipeline is connected through and on the front cover, and the exhaust pipeline is connected through and on the rear cover;

[0011] A heating furnace body, the heating furnace body is arranged inside the graphitization furnace main body, and a combined tooling is sleeved outside the heating furnace body, and the combined tooling is connected and matched with the graphitization furnace main body; and

[0012] An induction coil, the induction coil is wound around the outside of the heating furnace body;

[0013] Wherein the heating furnace body includes a graphite inner lining, a heat insulation layer and a furnace shell located on the outside, and a water cooling channel is arranged inside the furnace shell;

[0014] Cooling water circulates in the water cooling channel to take away the heat of the furnace shell and the induction coil wound on the outer side surface of the furnace shell, and cool the induction coil.

[0015] As a further scheme of the present invention: the graphitization furnace main body includes a cylinder body, four groups of support feet are symmetrically arranged at the bottom of the cylinder body, a through limiting chute is opened at the top of the inner side surface of the cylinder body, and positioning guide platforms are symmetrically arranged at the bottom of the inner side surface of the cylinder body.

[0016] As a further scheme of the present invention: the combined tooling includes a first retaining ring and a second retaining ring, a limiting sliding seat is connected and matched at the top of the first retaining ring and the second retaining ring, and the limiting sliding seat is adapted to the limiting chute;

[0017] Fixed bases are symmetrically arranged on both sides of the bottom of the first retaining ring and the second retaining ring, a sliding convex platform is arranged on the bottom surface of the fixed base, and the sliding convex platform is matched with a groove opened on the top surface of the positioning guide platform;

[0018] Wherein a gap is arranged between the top surface of the fixed base and the outer side surface of the induction coil.

[0019] As a further scheme of the present invention: the induction coil is spirally wound on the outer side surface of the furnace shell.

[0020] As a further solution of the present invention: heat insulation bodies and lining bodies are arranged on the inner sides of the front cover and the rear cover, and the lining bodies are located on the surfaces of the heat insulation bodies.

[0021] As a further solution of the present invention: a second water inlet pipe is connected to one side of the water cooling channel close to the feeding end of the heating furnace body, and a second water outlet pipe is connected to one side of the water cooling channel close to the discharging end of the heating furnace body.

[0022] As a further solution of the present invention: the front cover includes a first cover body and a second cover body, semi-spiral water grooves are symmetrically formed in the first cover body and the second cover body respectively, and the semi-spiral water grooves on the first cover body and the second cover body cooperate to form a spiral water groove;

[0023] One end of the spiral water groove in the front cover close to the center of the front cover is communicated with the second water inlet pipe, and a first water inlet pipe is connected to one end of the spiral water groove in the front cover far from the center of the front cover.

[0024] As a further solution of the present invention: the rear cover has the same structure as the front cover, one end of the spiral water groove in the rear cover close to the center of the rear cover is communicated with the second water outlet pipe, and a first water outlet pipe is connected to one end of the spiral water groove in the rear cover far from the center of the rear cover.

[0025] As a further solution of the present invention: an air cooling system is arranged on the main body of the graphitization furnace, and the air cooling system includes an air inlet pipe and an air outlet pipe;

[0026] The air inlet pipe is located at the bottom of the cylinder body; the air outlet pipe is located at the top of the cylinder body;

[0027] The inner sides of the two groups of positioning and guiding platforms are inclined, the space between the two groups of positioning and guiding platforms forms a wind guiding cavity, and the space between the heating furnace body and the cylinder body is a cooling cavity.

[0028] As a further solution of the present invention: an isostatic pressing graphite product graphitization treatment process, using the above-mentioned graphitization treatment equipment, includes the following steps:

[0029] Step 1, preparation: install the heating furnace body into the main body of the graphitization furnace, place the isostatic pressing graphite blank in the graphite crucible, and connect the second water inlet pipe to the front cover and the second water outlet pipe to the rear cover;

[0030] Step 2, heating: heat the isostatic pressing graphite blank through the induction coil, slowly rise at 5°C / min before 600°C, and then accelerate to 20°C / min, heat up to 2800°C, and then keep the temperature constant for 1 to 5 hours;

[0031] While heating, connect water inlet pipe 1 to introduce cooling water. The cooling water flows through the spiral water groove on the front cover, enters the water-cooling channel from water inlet pipe 2, flows out from water outlet pipe 2, and then flows through the spiral water groove on the rear cover and out from water outlet pipe 1.

[0032] At the same time, an external fan introduces air from the air inlet pipe. The air flow is guided through the air guide cavity into the cooling cavity and then flows upward through the cooling cavity and is discharged through the air outlet pipe.

[0033] Step 3: Gradient cooling. First, naturally cool to 1500 °C, and then introduce cold argon to accelerate the cooling to room temperature.

[0034] Step 4: Take out and detect. Open the front cover, take out the isostatic graphite body, and detect performance such as resistivity, density, and ash content.

[0035] Advantages of the present invention:

[0036] The furnace shell of the present invention adopts a double-layer structure. By circulating cooling water in the water-cooling channel, the heat of the furnace shell and the induction coil wound on the outer side of the furnace shell is carried away, changing from passive heat insulation to active heat conduction, thereby reducing the temperature of the induction coil during the heating process. Moreover, the cooling path connects the front cover and the rear cover, cooling the front cover and the rear cover while cooling the furnace shell, optimizing the cooling effect.

[0037] By combining air cooling and water cooling, the present invention can more effectively carry away the heat generated by the induction coil, improve the cooling efficiency. At the same time, the internal and external double cooling improves the stability and reliability of the system. And the air cooling flows from bottom to top, enabling the combined action of the mechanical driving force of forced convection and the buoyancy of natural convection, accelerating the fluid flow rate, reducing the energy loss against buoyancy, and thus achieving a more efficient and energy-saving cooling effect. Description of the drawings

[0038] The present invention will be further described below with reference to the drawings.

[0039] Figure 1 is the overall structural schematic diagram of the graphitization treatment equipment of the present invention;

[0040] Figure 2 is the structural schematic diagram of the internal semi-spiral water groove of the front cover of the present invention;

[0041] Figure 3 is the internal structural schematic diagram of the graphitization treatment equipment of the present invention Figure 1 ;

[0042] Figure 4 is the structural schematic diagram of the combined tooling and the heating furnace body of the present invention;

[0043] Figure 5 is the side structural schematic diagram of the combined tooling and the heating furnace body of the present invention;

[0044] Figure 6 is a schematic structural view of the heating furnace body of the present invention after removing the induction coil;

[0045] Figure 7 is a schematic longitudinal sectional structural view of the furnace shell of the present invention;

[0046] Figure 8 is a schematic transverse sectional structural view of the furnace shell of the present invention;

[0047] Figure 9 is a schematic internal structure of the graphitization treatment equipment of the present invention Figure 2 ;

[0048] Figure 10 is a schematic structural view of the air cooling system of the present invention.

[0049] In the figure: 1, the main body of the graphitization furnace; 11, the cylinder body; 12, the support feet; 13, the limit sliding groove; 14, the positioning guide platform; 15, the air inlet pipe; 16, the air outlet pipe; 17, the air guide cavity; 18, the cooling cavity; 2, the front cover; 21, the first cover body; 22, the semi-helical water tank; 23, the first water inlet pipe; 24, the second cover body; 26, the heat insulation body; 27, the lining body; 3, the rear cover; 31, the first water outlet pipe; 4, the air inlet pipeline; 5, the air outlet pipeline; 6, the combined tooling; 61, the first retaining ring; 62, the second retaining ring; 63, the limit sliding seat; 64, the handle; 65, the fixed base; 66, the sliding boss; 7, the heating furnace body; 71, the graphite lining; 72, the heat insulation layer; 73, the heating cavity; 74, the furnace shell; 741, the water cooling channel; 75, the second water inlet pipe; 76, the second water outlet pipe; 8, the induction coil. Specific embodiments

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0051] Embodiment 1

[0052] As Figures 1-9As shown in the figure, this embodiment provides a graphitization processing device for isostatic graphite products. The device includes a graphitization furnace main body 1. A front cover 2 is provided on the feeding side of the graphitization furnace main body 1, and a rear cover 3 is provided on the discharging side of the graphitization furnace main body 1. A gas inlet pipeline 4 is connected through the middle of the front cover 2, and a gas outlet pipeline 5 is connected through the middle of the rear cover 3. A heating furnace body 7 is arranged inside the graphitization furnace main body 1, and a combined tooling 6 is sleeved outside the heating furnace body 7. The heating furnace body 7 is connected to the inside of the graphitization furnace main body 1 through the combined tooling 6, and an induction coil 8 is wound outside the heating furnace body 7 for heating the product inside the heating furnace body 7.

[0053] Both the front cover 2 and the rear cover 3 are connected to the graphitization furnace main body 1 through hinges and are locked with the graphitization furnace main body 1 during the heating process (the locking structure is a prior art and is not shown in the figure), forming a sealed chamber for high-temperature heating of the product.

[0054] During the heating process, high-purity argon gas is continuously introduced into the above-mentioned gas inlet pipeline 4 to discharge volatile impurities such as H2O and O2 adsorbed inside the heated isostatic graphite blank, and is discharged from the gas outlet pipeline 5. Continuously introducing high-purity argon gas maintains the heating atmosphere to prevent the isostatic graphite blank from being oxidized during the heating process. Further, a negative pressure system can be arranged inside the gas outlet pipeline 5 to accelerate the gas discharge. The negative pressure system is a prior art and its specific structure will not be elaborated here.

[0055] This embodiment also arranges a combined tooling 6 outside the heating furnace body 7, so that the heating furnace body 7 can be installed conveniently and quickly during assembly. Similarly, when maintaining or replacing parts of the heating furnace body 7, the heating furnace body 7 can also be taken out conveniently. And the combined tooling 6 also provides a layer of physical protection for the heating furnace body 7 located inside the graphitization furnace main body 1 to avoid being affected by external collisions and other factors. The induction coil 8 wound outside the heating furnace body 7 is also isolated and protected to a certain extent.

[0056] Furthermore, as Figure 3 shown, the graphitization furnace main body 1 in this embodiment includes a cylindrical barrel 11. Four groups of support feet 12 are symmetrically arranged at the bottom of the barrel 11 to support the entire device. And a through limiting chute 13 is opened at the top of the inner side surface of the barrel 11 to facilitate cooperation with the combined tooling 6 to position the heating furnace body 7 during installation. And positioning guide platforms 14 are symmetrically arranged at the bottom of the inner side surface of the barrel 11 to support the heating furnace body 7 when it is loaded into the barrel 11 and provide certain longitudinal guidance for the installation. The positioning guide platforms 14 and the limiting chute 13 cooperate with the combined tooling 6 to ensure the stability of the heating furnace body 7 during installation or disassembly.

[0057] Furthermore, as Figure 3 and Figure 4As shown in the figure, the above-mentioned combined tooling 6 includes a first retaining ring 61 at the feeding end of the heating furnace body 7 and a second retaining ring 62 at the discharging end of the heating furnace body 7. A limiting sliding seat 63 is connected and matched at the top of the first retaining ring 61 and the second retaining ring 62. Handles 64 are installed on both sides of the first retaining ring 61 and the second retaining ring 62. Fixed bases 65 are symmetrically arranged on both sides of the bottom of the first retaining ring 61 and the second retaining ring 62. The fixed bases 65 are connected to the first retaining ring 61 and the second retaining ring 62 through support columns (as Figure 5 shown), so that a gap is formed between the top surface of the fixed base 65 and the surface of the induction coil 8. On the one hand, it isolates the influence of external collision or vibration on the induction coil 8, and on the other hand, it facilitates the heat dissipation of the induction coil 8. A sliding boss 66 is further arranged on the bottom surface of the fixed base 65, and longitudinal guidance and limitation are realized by the cooperation of the sliding boss 66 and the groove opened on the top surface of the positioning and guiding platform 14.

[0058] In the installation of the heating furnace body 7 equipped with the combined tooling 6 in this embodiment, first, one end of the limiting sliding seat 63 is butted with the limiting chute 13. At the same time, the sliding boss 66 at the bottom is matched with the groove opened on the top surface of the positioning and guiding platform 14. The heating furnace body 7 is loaded into the inside of the cylinder body 11 by supporting on both sides through the handles 64, and through opening the front cover 2 and the rear cover 3, the cooperation and assembly are carried out on the front and rear sides of the graphitization furnace main body 1 (pushing in one end and pulling in the other end), improving the assembly efficiency.

[0059] As Figures 3-8 shown, the heating furnace body 7 in this embodiment includes a graphite inner lining 71 inside, a heating cavity 73 is opened inside the graphite inner lining 71, a heat insulation layer 72 is arranged outside the graphite inner lining 71, a furnace shell 74 is arranged outside the heat insulation layer 72, and the above-mentioned induction coil 8 is spirally wound on the outer side surface of the furnace shell 74.

[0060] The graphite inner lining 71 is made of high-purity isostatic graphite with an ash content ≤50 ppm, and is designed to be detachable. The surface is coated with a SiC coating to resist oxidation. It is directly in contact with the high-temperature environment and serves as an electromagnetic field coupling medium to guide the eddy current to heat the isostatic graphite blank. The middle heat insulation layer 72 adopts a multi-layer composite structure, with a ceramic fiber board on the outer layer and a graphite felt on the inner layer, blocking heat radiation and conduction and reducing heat loss. The outer furnace shell 74 is made of 316L stainless steel to achieve pressure bearing and mechanical support.

[0061] When heating, the isostatic graphite blank is placed in a graphite crucible and pushed into the heating cavity 73, and then the induction coil 8 is used to heat the isostatic graphite blank.

[0062] Furthermore, as Figure 3 and Figure 9As shown in the figure, an insulating body 26 and a lining body 27 are also provided on the inner side of the front cover 2 in this embodiment. Among them, the lining body 27 is located on the surface layer of the insulating body 26. The insulating body 26 is made of graphite felt material, while the lining body 27 is made of high-purity isostatic graphite with an ash content of ≤50 ppm and its surface is coated with a SiC coating for oxidation resistance. Similarly, an insulating body 26 and a lining body 27 are also provided on the inner side of the rear cover 3. The lining body 27 is in direct contact with the high-temperature environment, and the insulating body 26 blocks heat radiation and conduction to reduce heat loss.

[0063] Among them, both the intake pipeline 4 and the exhaust pipeline 5 penetrate through the corresponding lining body 27 to realize the circulation of argon gas.

[0064] Furthermore, in order to conduct heat actively on the induction coil 8 to avoid continuous temperature rise of the induction coil 8 during the heating process and affect its heating efficiency, the furnace shell 74 in this embodiment adopts a double-layer structure, specifically as Figure 7 and Figure 8 shown. A water-cooling channel 741 is provided inside the furnace shell 74 in this embodiment. And the water-cooling channel 741 is connected to a second water inlet pipe 75 on one side close to the feeding end of the heating furnace body 7, and is connected to a second water outlet pipe 76 on one side close to the discharging end of the heating furnace body 7. By circulating cooling water in the water-cooling channel 741, the heat of the furnace shell 74 and the induction coil 8 wound on the outer side surface of the furnace shell 74 is taken away, changing from passive heat insulation to active heat conduction, and further reducing the temperature of the induction coil 8 during the heating process.

[0065] Among them, the second water inlet pipe 75 and the second water outlet pipe 76 extend outwards through the corresponding first retaining ring 61 and second retaining ring 62 on the corresponding side.

[0066] Further, in order to strengthen the cooling of the equipment sufficiently, the front cover 2 and the rear cover 3 in this embodiment have the same structure, and both include a first cover body 21 and a second cover body 24. Semi-spiral water grooves 22 are symmetrically opened on the first cover body 21 and the second cover body 24 respectively (as Figure 2 shown). The semi-spiral water grooves 22 on the first cover body 21 and the second cover body 24 cooperate to form a complete spiral water groove.

[0067] Among them, one end of the spiral water groove in the front cover 2 close to the center of the front cover 2 is connected to the second water inlet pipe 75, and the other end far from the center of the front cover 2 is connected to a first water inlet pipe 23. The first water inlet pipe 23 is connected to an external cooling system to introduce cooling water. And one end of the spiral water groove in the rear cover 3 close to the center of the rear cover 3 is connected to the second water outlet pipe 76, and the other end far from the center of the rear cover 3 is connected to a first water outlet pipe 31 for discharging cooling water.

[0068] The circulating cooling water enters through the first water inlet pipe 23, flows through the spiral water channel of the front cover 2, then enters the water cooling channel 741, flows out from the second water outlet pipe 76, and then flows through the spiral water channel of the rear cover 3 and out from the first water outlet pipe 31 to cool the front cover 2, the rear cover 3 and the furnace shell 74 in the equipment. While cooling the furnace shell 74, the front cover 2 and the rear cover 3 are also cooled to optimize the cooling effect.

[0069] It should be noted that both the above-mentioned second water inlet pipe 75 and the second water outlet pipe 76 adopt flexible pipelines (bendable) and are both provided with quick-connect joints to realize the connection with the corresponding positions of the front cover 2 and the rear cover 3.

[0070] Embodiment 2

[0071] In order to further improve the cooling effect on the induction coil 8, an air cooling system is also provided on the main body 1 of the graphitization furnace in this embodiment. The air cooling system is as Figure 9 and Figure 10 shown, including an air inlet pipe 15 at the bottom of the cylinder body 11 and an air outlet pipe 16 at the top of the cylinder body 11. There are two groups of air outlet pipes 16, which are respectively located at both ends of the top of the cylinder body 11, and the inner sides of the two groups of positioning guide platforms 14 are inclined, so that the space between the two groups of positioning guide platforms 14 forms a wind guiding cavity 17. Further, the space between the heating furnace body 7 and the cylinder body 11 is a cooling cavity 18. The wind guiding cavity 17 is communicated with the cooling cavity 18 to realize the flow of air.

[0072] When heating the isostatic graphite blank, air is introduced from the air inlet pipe 15 by an external fan. The air flow is guided through the wind guiding cavity 17 into the cooling cavity 18 (mainly enters from the gap between the induction coil 8 and the top surface of the fixed base 65), and then flows upward through the cooling cavity 18 and is discharged through the air outlet pipe 16 to take away the heat of the induction coil 8 to realize air cooling.

[0073] In this embodiment, by combining air cooling and water cooling, the heat generated by the induction coil 8 can be taken away more effectively, the cooling efficiency can be improved, and at the same time, the internal and external double cooling improves the stability and reliability of the system. And the air cooling flows from bottom to top, so that the mechanical driving force of forced convection and the buoyancy of natural convection act together, accelerating the fluid flow rate, reducing the energy loss against buoyancy, and thus realizing a more efficient and energy-saving cooling effect.

[0074] The processing technology of this embodiment includes the following steps:

[0075] Step 1: Preparation. Install the heating furnace body 7 into the main body 1 of the graphitization furnace, close and lock the rear cover 3, place the isostatic graphite blank in the graphite crucible, push it into the heating cavity 73, close and lock the front cover 2. Before closing the front cover 2 and the rear cover 3, connect the second water inlet pipe 75 to the front cover 2 and connect the second water outlet pipe 76 to the rear cover 3;

[0076] Step 2: Heating, heating the isostatic graphite blank through the induction coil 8, slowly increasing the temperature by 5 °C / min before 600 °C, and then accelerating to 20 °C / min, raising the temperature to 2800 °C, and then maintaining a constant temperature for 1 to 5 hours;

[0077] While heating, turn on the first water inlet pipe 23, introduce cooling water, the cooling water flows through the spiral water tank of the front cover 2, enters the water cooling channel 741 from the second water inlet pipe 75, flows out from the second water outlet pipe 76, and then flows through the spiral water tank of the rear cover 3 and flows out from the first water outlet pipe 31 to cool the inner side of the induction coil 8;

[0078] At the same time, an external fan introduces air from the air inlet pipe 15, the air flow is guided through the air guide cavity 17 into the cooling cavity 18, and then flows upward through the cooling cavity 18 and is discharged from the air outlet pipe 16 to take away the heat of the induction coil 8 and cool the outer side of the induction coil 8;

[0079] Step 3: Gradient cooling, first naturally cool to 1500 °C at a rate of approximately 30 °C / min, and then introduce cold argon to accelerate the cooling to room temperature;

[0080] Step 4: Taking and detecting, open the front cover 2, take out the isostatic graphite body, and detect the performance such as resistivity, density, and ash content.

[0081] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present invention. In addition, "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0082] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0083] The above has described in detail an embodiment of the present invention, but the above content is only a preferred embodiment of the present invention and cannot be considered as defining the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. An isostatic graphite product graphitization treatment equipment, characterized in that: include: A graphitization furnace body (1), a front cover (2) and a rear cover (3); An air inlet pipeline (4) and an air outlet pipeline (5), wherein the air inlet pipeline (4) is connected to the front cover (2) through a through hole, and the air outlet pipeline (5) is connected to the rear cover (3) through a through hole; A heating furnace body (7), wherein the heating furnace body (7) is arranged inside the graphitization furnace body (1), and a combined tool (6) is mounted on the outside of the heating furnace body (7), and the combined tool (6) is connected to the graphitization furnace body (1); as well as an induction coil (8), wherein the induction coil (8) is wound around the outside of the heating furnace body (7); The heating furnace body (7) comprises a graphite lining (71), a heat insulation layer (72) and a furnace shell (74) located on the outside, and a water cooling channel (741) is arranged inside the furnace shell (74); The cooling water circulates in the water cooling channel (741) to take away the heat of the furnace shell (74) and the induction coil (8) wound around the outer surface of the furnace shell (74), thereby cooling the induction coil (8).

2. The graphitization treatment equipment for isostatically pressed graphite products according to claim 1, characterized in that: The graphitization furnace body (1) comprises a cylinder (11), four groups of supporting feet (12) are symmetrically arranged at the bottom of the cylinder (11), a through limiting sliding groove (13) is opened at the top of the inner side surface of the cylinder (11), and a positioning guide platform (14) is symmetrically arranged at the bottom of the inner side surface of the cylinder (11).

3. The graphitization treatment equipment for isostatically pressed graphite products according to claim 2, characterized in that: The combined tool (6) comprises a first retaining ring (61) and a second retaining ring (62), the tops of the first retaining ring (61) and the second retaining ring (62) are cooperatively connected with a limiting slide seat (63), and the limiting slide seat (63) is adapted to the limiting slide groove (13); A fixed base (65) is symmetrically arranged on both sides of the bottom of the first retaining ring (61) and the second retaining ring (62), a sliding boss (66) is arranged on the bottom surface of the fixed base (65), and the sliding boss (66) cooperates with a groove provided on the top surface of the positioning guide platform (14); A gap is provided between the top surface of the fixed base (65) and the outer side surface of the induction coil (8).

4. The graphitization treatment equipment for isostatic graphite products according to claim 3, characterized in that: The induction coil (8) is spirally wound on the outer surface of the furnace shell (74).

5. The graphitization treatment equipment for isostatically pressed graphite products according to claim 1, characterized in that: The inner sides of the front cover (2) and the rear cover (3) are both provided with a heat insulator (26) and an inner lining (27), and the inner lining (27) is located on the surface of the heat insulator (26).

6. The graphitization treatment equipment for isostatic graphite products according to claim 1 or 4, characterized in that: The water cooling channel (741) is connected to a second water inlet pipe (75) on the side close to the feeding end of the heating furnace body (7), and the water cooling channel (741) is connected to a second water outlet pipe (76) on the side close to the discharging end of the heating furnace body (7).

7. The graphitization treatment equipment for isostatic graphite products according to claim 6, characterized in that: The front cover (2) comprises a first cover body (21) and a second cover body (24), the first cover body (21) and the second cover body (24) are symmetrically provided with semi-spiral water grooves (22), and the semi-spiral water grooves (22) on the first cover body (21) and the second cover body (24) cooperate to form a spiral water groove; The spiral water groove in the front cover (2) is connected to the water inlet pipe 2 (75) at one end close to the center of the front cover (2), and is connected to the water inlet pipe 1 (23) at one end away from the center of the front cover (2).

8. The graphitization treatment equipment for isostatic graphite products according to claim 6, characterized in that: The rear cover (3) has the same structure as the front cover (2), and the spiral water groove in the rear cover (3) is connected to the second water outlet pipe (76) at one end close to the center of the rear cover (3), and the spiral water groove in the rear cover (3) is connected to the first water outlet pipe (31) at one end away from the center of the rear cover (3).

9. The graphitization treatment equipment for isostatically pressed graphite products according to claim 2, characterized in that: The graphitization furnace body (1) is provided with an air cooling system, and the air cooling system comprises an air inlet pipe (15) and an air outlet pipe (16); The air inlet pipe (15) is located at the bottom of the cylinder (11); the air outlet pipe (16) is located at the top of the cylinder (11); The inner side surfaces of the two groups of positioning guide platforms (14) are arranged at an angle, the space between the two groups of positioning guide platforms (14) forms an air guide cavity (17), and the space between the heating furnace body (7) and the cylinder body (11) is a cooling cavity (18).

10. A graphitization process for isostatically pressed graphite products, characterized in that: Using the graphitization treatment device as described in any one of Figures 1-9, comprising the following steps: Step 1: prepare, install the heating furnace body (7) into the graphitization furnace body (1), place the isostatically pressed graphite blank in the graphite crucible, and connect the second water inlet pipe (75) and the front cover (2) and the second water outlet pipe (76) and the rear cover (3); Step 2: Heating: heating the isostatically pressed graphite blank by means of an induction coil (8), slowly increasing the temperature by 5°C / min before reaching 600°C, then accelerating the temperature to 20°C / min, raising the temperature to 2800°C, and then maintaining the temperature at a constant level for 1 to 5 hours; While heating, the water inlet pipe 1 (23) is connected to allow cooling water to flow in. The cooling water flows through the spiral water groove of the front cover (2), enters the water cooling channel (741) from the water inlet pipe 2 (75), flows out from the water outlet pipe 2 (76), flows through the spiral water groove of the rear cover (3), and flows out from the water outlet pipe 1 (31); At the same time, an external fan draws in air from the air inlet pipe (15), and the air flow is guided into the cooling chamber (18) through the air guide chamber (17), and then flows upward from the cooling chamber (18) and is discharged through the air outlet pipe (16); Step 3: Gradient cooling: first cool naturally to 1500°C, then introduce cold argon gas to accelerate cooling to room temperature; Step 4: Take out the material for testing. Open the front cover (2), take out the isostatically pressed graphite body, and test its resistivity, density, ash content and other properties.

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