An impregnation apparatus for the production of graphite products

Abstract

The application relates to a kind of impregnation equipment for graphite product production in the technical field of graphite material processing, comprising impregnation tank, vacuum system and pressurization system, impregnation tank is equipped with top cover, the bottom of impregnation tank is equipped with ultrasonic generator;The equipment further comprises a circulating spray system, a rotating bearing device and a heating system for heating the impregnation liquid;Rotary bearing device includes rotating support shaft and driving motor, the middle shaft body and the top end shaft body of rotating support shaft are respectively fixed with two cantilever middle rods and two cantilever top rods, two cantilever middle rods and two cantilever top rods are distributed in cross radial, the outer end of cantilever middle rod and cantilever top rod is respectively rotatably installed with placing middle disc and placing top disc;At least two spray pipes are uniformly and fixedly arranged on the inner wall of impregnation tank, the spray pipe is provided with a plurality of spray heads, and the circulating spray system makes the impregnation liquid flow in and out of the cycle;The impregnation equipment improves the impregnation depth and uniformity through the synergistic effect of rotating dynamic, circulating spray impregnation and ultrasonic assisted impregnation.

Description

Technical Field

[0001] This invention relates to the field of graphite material processing technology, and in particular to an impregnation device for the production of graphite products. Background Technology

[0002] It is well known that graphite raw materials used in the manufacture of industrial equipment generally have varying degrees of cracks and pores, requiring impregnation with liquid resin and subsequent curing to improve the mechanical strength and impermeability of the graphite material. For a long time, the impregnation process of graphite materials has mainly adopted the static pressure impregnation method, which involves placing the graphite material in a container, sealing the container, drying it by drawing a negative pressure and heating it, then injecting impregnation resin until the graphite material is submerged, and then passing compressed air to pressurize the container to a certain pressure and maintaining the pressure for a period of time to impregnate the graphite material in a static state with resin.

[0003] However, the traditional static pressure impregnation method has obvious technical defects. On the one hand, although this method can wet the graphite surface and fill large cracks and pores, the impregnation depth is very limited, making it difficult for the impregnating liquid to fully penetrate into the micropores inside the graphite material. On the other hand, since the graphite material is in a static state in the impregnation tank, the contact and penetration between the impregnating liquid and the graphite material surface mainly rely on pressure drive, lacking an active penetration promotion mechanism, resulting in poor impregnation uniformity. In addition, porous graphite material not only has low mechanical strength and low heat transfer efficiency, but also consumes a large amount of impregnating resin. After curing, it is easy to cause inconsistent thermal expansion inside the graphite material, causing stress concentration and harming the overall performance of the graphite material.

[0004] To address the aforementioned issues, some technologies have attempted to incorporate ultrasonic assistance into the impregnation process. For instance, existing technologies disclose a scheme of installing an ultrasonic generator on the impregnation tank, utilizing the cavitation effect of ultrasound to promote the penetration of the impregnation solution into the pores of the graphite material. However, in existing ultrasonic-assisted impregnation equipment, the graphite product is usually still or only undergoes simple movement during the impregnation process, resulting in a limited area of ​​ultrasonic action and making it difficult to ensure that all graphite products receive a relatively uniform ultrasonic treatment effect. Furthermore, the impregnation solution is prone to uneven concentration distribution during prolonged impregnation, further affecting the uniformity of impregnation. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art and solve the existing technical problems, the present invention discloses an impregnation device for the production of graphite products, which improves the impregnation depth and uniformity through the synergistic effect of rotational dynamic, circulating spray impregnation and ultrasonic-assisted impregnation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An impregnation apparatus for producing graphite products includes an impregnation tank, a vacuum system for evacuating the impregnation tank, and a pressurization system for introducing pressurized gas into the impregnation tank. The impregnation tank has a detachable and fixed top cover, and an ultrasonic generator is located at the bottom of the impregnation tank. The apparatus also includes a circulating spray system, a rotating support device, and a heating system for heating the impregnation liquid. The rotating support device includes a rotating support shaft coaxially disposed within the impregnation tank. The lower end of the rotating support shaft rotatably seals through the bottom of the impregnation tank and is connected to a drive motor, while the top end of the rotating support shaft is close to the impregnation tank. In the middle section, two cantilevered middle rods and two cantilevered top rods are symmetrically fixed to the middle shaft and the top shaft of the pivot shaft, respectively, and the two cantilevered middle rods and two cantilevered top rods are arranged in a cross radial distribution. The upper surface of the outer end of the cantilevered middle rods and the cantilevered top rods are respectively rotatably mounted with a placement plate and a placement plate for placing graphite products. At least two spray pipes are uniformly and fixed around the inner wall of the impregnation tank along the axial direction of the impregnation tank. The spray pipes are provided with multiple spray heads corresponding to the outer side of the graphite products. The circulating spray system is used to supply impregnation liquid to the spray pipes and make the impregnation liquid circulate inside and outside.

[0008] Furthermore, the circulating spraying system includes a circulating pump, and the top side wall and bottom of the impregnation tank are respectively provided with an inlet pipe and an outlet pipe, and the inlet and outlet of the circulating pump are respectively connected to the outlet pipe and the inlet pipe.

[0009] Furthermore, the impregnation tank is equipped with a level gauge, the outer end of the outlet pipe is equipped with a discharge valve, the inlet of the circulation pump is respectively connected to a supply pipe with a valve and a return pipe, the return pipe is connected to the outlet pipe, and the supply pipe is connected to an external impregnation liquid supply source.

[0010] Furthermore, a vertical distribution main pipe is provided in the center of the inner top of the impregnation tank. The top end of the distribution main pipe is connected to the liquid inlet pipe, the bottom end of the distribution main pipe is closed, and the side wall of the distribution main pipe is connected to the top end of the corresponding spray pipe through a distribution branch pipe.

[0011] Furthermore, the heating system includes a jacket that is fixed to the outer wall of the impregnation tank. The bottom and top of the jacket are respectively provided with a circulation inlet pipe and a circulation outlet pipe, and a thermometer is installed at the bottom of the impregnation tank.

[0012] Furthermore, the diameter of the middle plate is half the difference between the inner diameter of the immersion tank and the diameter of the pivot shaft, and the diameter of the top plate is the difference between the inner radius of the immersion tank and the diameter of a spray pipe.

[0013] Furthermore, both the middle plate and the top plate include an outer ring frame and a middle plate base. The middle plate base is connected and fixed to the outer ring frame by a plurality of evenly arranged connecting rods. The surfaces of the middle plate and the top plate are fixed with a support net.

[0014] Furthermore, the ultrasonic generating device includes an ultrasonic transducer and an ultrasonic generator. The ultrasonic transducer is disposed on the inner wall of the bottom side of the impregnation tank, and the ultrasonic generator is disposed on the outside of the impregnation tank and electrically connected to the ultrasonic transducer.

[0015] Furthermore, the pressurization system includes a compressed gas source and a pressurization pipeline. One end of the pressurization pipeline is connected to the impregnation tank, and the other end is connected to the compressed gas source. A pressurization valve is provided on the pressurization pipeline. A pressure gauge and an venting pipe with an exhaust valve are provided on the top of the impregnation tank.

[0016] Furthermore, the vacuum system includes a vacuum pump and a vacuum pipeline. One end of the vacuum pipeline is connected to the impregnation tank, and the other end is connected to the vacuum pump. A vacuum valve is provided on the vacuum pipeline.

[0017] By employing the technical solution described above, the present invention has the following beneficial effects:

[0018] The impregnation equipment for graphite product production disclosed in this invention utilizes a rotating bearing device to drive each graphite product to rotate, so that each graphite product can alternately rotate to approach and move away from the ultrasonic generator during impregnation, thereby achieving uniform ultrasonic action on multiple graphite products and effectively overcoming the defect of limited ultrasonic action area in traditional static impregnation.

[0019] The impregnation equipment for graphite product production disclosed in this invention utilizes a circulating spray system and its spray pipes to perform dynamic regulation during the impregnation process. On the one hand, it breaks the concentration polarization layer formed on the graphite surface due to the consumption of effective components through forced convection, maintaining the concentration gradient inside and outside the micropores. On the other hand, it uses the shear force of the liquid flow to remove the bubbles formed by the gas discharged from the micropores in time, preventing the gas film from hindering the re-permeation of the impregnation liquid. Furthermore, it eliminates temperature and concentration stratification caused by heating and differences in component specific gravity within the tank through forced overall circulation and mixing. Ultimately, "immersion" and "spraying" complement each other, ensuring that the graphite product is in a liquid phase environment, while spraying ensures that the liquid phase environment is always fresh, uniform, and undisturbed. Together, they guarantee the uniformity of impregnation.

[0020] In summary, the rotational motion of the rotating bearing device causes the graphite product to dynamically tumble in the impregnation solution, continuously updating the contact interface between the graphite product surface and the impregnation solution; the cavitation effect of ultrasound promotes the penetration of the impregnation solution into the micropores of the graphite at the micro level; and the continuous spraying of the spray pipe ensures the uniformity of the impregnation solution concentration at the macro level. The synergistic effect of these three factors effectively solves the technical problems of limited impregnation depth and poor impregnation uniformity in the traditional static pressure impregnation method. Attached Figure Description

[0021] Figure 1 This is a cross-sectional schematic diagram of an embodiment of the present invention;

[0022] Figure 2 This is a top view of the present invention with the top cover removed;

[0023] Figure 3 This is a schematic diagram of the implementation structure for placing the top plate and the middle plate.

[0024] In the diagram: 1. Impregnation tank; 2. Spray head; 3. Cantilever top rod; 4. Swing shaft; 5. Thermometer; 6. Circulation pump; 7. Discharge pipe; 8. Drive motor; 9. Ultrasonic generator; 10. Cantilever center rod; 11. Placement plate; 12. Spray pipe; 13. Jacket; 14. Placement top plate; 15. Level gauge; 16. Distribution branch pipe; 17. Top cover; 18. Drain pipe; 19. Pressure gauge; 20. Distribution main pipe; 21. Pressurization valve; 22. Vacuum valve; 23. Inlet pipe; 24. Outer ring frame; 25. Connecting rod; 26. Center plate seat. Detailed Implementation

[0025] The technical solution of the present invention will be described below with reference to the accompanying drawings of the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the accompanying drawings of the present invention for the convenience of describing the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation.

[0026] Combined with appendix Figure 1-3 The impregnation equipment for graphite product production includes an impregnation tank 1, a vacuum system for evacuating the impregnation tank 1, and a pressurization system for introducing pressurized gas into the impregnation tank 1. The vacuum system evacuates the impregnation tank 1 before impregnation to remove air and moisture from the micropores of the graphite product, providing an airtight channel for the impregnation liquid to penetrate the micropores. During the impregnation process, the pressurization system introduces compressed gas into the impregnation tank 1, maintaining an impregnation pressure higher than atmospheric pressure. This pressure difference drives the impregnation liquid to penetrate the internal pores of the graphite product. Specifically, the pressurization system includes a compressed gas source and a pressurization pipeline. One end of the pressurization pipeline is connected to the impregnation tank 1, and the other end is connected to the compressed gas source. The pressurization pipeline is equipped with... The pressure valve 21 is used to adjust the pressure increase rate and final holding pressure in the impregnation tank 1 by controlling the opening degree of the pressure valve 21. The top of the impregnation tank 1 is equipped with a pressure gauge 19 and an exhaust pipe 18 with an exhaust valve. The pressure gauge 19 is used to monitor the gas pressure in the impregnation tank 1 in real time to ensure that the impregnation pressure is within the set range. The exhaust pipe 18 and its exhaust valve are used to release the residual pressure in the tank after impregnation and to discharge the air in the tank before vacuuming, so as to facilitate the subsequent operation of the vacuum system. Specifically, the vacuum system includes a vacuum pump and a vacuum pipeline. One end of the vacuum pipeline is connected to the impregnation tank 1 and the other end is connected to the vacuum pump. A vacuum valve 22 is provided on the vacuum pipeline. By opening the vacuum valve 22 and starting the vacuum pump, the inside of the impregnation tank 1 is evacuated to a predetermined vacuum level.

[0027] The impregnation tank 1 is equipped with a detachable and fixed top cover 17. After the graphite product is placed inside, the top cover 17 is sealed and fixedly connected to the impregnation tank 1, ensuring the sealing of the impregnation tank 1 during vacuuming and pressurization processes, and facilitating the removal of the graphite product after impregnation. An ultrasonic generator 9 is located on one side of the bottom of the impregnation tank 1. Specifically, the ultrasonic generator 9 includes an ultrasonic transducer and an ultrasonic generator. The ultrasonic transducer is located on the inner wall of the bottom side of the impregnation tank 1, and the ultrasonic generator is located outside the impregnation tank 1 and electrically connected to the ultrasonic transducer. The ultrasonic generator generates... High-frequency electrical signals are transmitted to an ultrasonic transducer, which converts electrical energy into mechanical vibration energy and radiates ultrasonic waves into the impregnation liquid. The cavitation effect of ultrasonic waves in the liquid generates local high temperature and pressure and micro-jet, which strips away gas and residues in the micropores of graphite and promotes the continuous penetration of the impregnation liquid into the depth of the micropores. The ultrasonic transducer is set on the inner wall of the bottom side so that the ultrasonic waves mainly propagate from the lower side of the tank into the tank. In conjunction with the rotating bearing device, each graphite product alternately approaches and moves away from the sound source during the rotation, so as to achieve spatial homogenization of the sound field.

[0028] The equipment also includes a circulating spray system, a rotating bearing device, and a heating system for heating the impregnation liquid. Specifically, the heating system includes a jacket 13 fixed to the outer wall of the impregnation tank 1. The bottom and top of the jacket 13 are respectively provided with a circulating inlet pipe and a circulating outlet pipe. The circulating inlet pipe is used to introduce a heating medium, such as circulating hot water or circulating heat transfer oil, into the jacket 13. The circulating outlet pipe is used to discharge the medium after heat exchange. The heating medium circulates between the jacket 13 and the external heating equipment, and indirectly heats the impregnation liquid in the impregnation tank 1 through the heat exchange wall of the jacket 13, so that the impregnation liquid is maintained within a suitable working temperature range. A thermometer 5 is installed at the bottom of the impregnation tank 1. The thermometer 5 is used to detect the temperature of the impregnation liquid in the impregnation tank 1 in real time, so as to adjust the heating power or heating medium flow rate of the heating system according to the process requirements, and ensure that the temperature of the impregnation liquid meets the set requirements of the impregnation process.

[0029] The rotating bearing device includes a rotating support shaft 4 coaxially mounted inside the impregnation tank 1. The lower end of the rotating support shaft 4 rotatably passes through the bottom of the impregnation tank 1 and is connected to a drive motor 8. The drive motor 8 is mounted and fixed outside the impregnation tank 1, and its output shaft is connected to the lower end of the rotating support shaft 4 for transmission. The rotating support shaft 4 rotatably passes through the bottom wall of the impregnation tank 1 through bearings and sealing components to ensure that the impregnation tank 1 is sealed while transmitting rotational power, thus preventing leakage of the impregnation liquid. The top end of the rotating support shaft 4 is close to the middle of the impregnation tank 1, providing a support base for the installation of the cantilever middle rod 10 and the cantilever top rod 3. Two cantilever middle rods are symmetrically fixed to the middle shaft and the top shaft of the rotating support shaft 4, respectively. The cantilever shaft 10 and two cantilever top rods 3 are arranged radially in a cross pattern. Specifically, the two cantilever middle rods 10 extend radially relative to each other at the middle shaft of the pivot shaft 4, with an included angle of 180 degrees. The two cantilever top rods 3 also extend radially relative to each other at the top shaft of the pivot shaft 4, with an included angle of 180 degrees. The extension direction of the cantilever top rods 3 and the extension direction of the cantilever middle rods 10 form a 90-degree angle on the horizontal projection plane, so that the four cantilever ends are evenly distributed in four different directions around the circumference in the top view, achieving a spatially staggered arrangement; the cantilever middle rods 10 and the cantilever top rods 3... The outer upper surface is rotatably mounted with a middle plate 11 and a top plate 14 for placing graphite products. Each of the middle and top plates can rotate freely horizontally relative to its mounted cantilever. When the pivot shaft 4 drives the cantilever middle rod 10 and cantilever top rod 3 to rotate as a whole, the middle and top plates 11 and 14 rotate relative to the cantilever under the resistance torque of the impregnation liquid and their own inertia. This causes the graphite products placed on the plates to not only revolve with the support frame but also to slowly rotate on their own axis, further updating the contact state between the graphite product surface and the impregnation liquid. Depending on the requirements, the diameter of the middle plate 11 is [not specified in the original text]. The diameter of the top plate 14 is half the difference between the inner radius of the impregnation tank 1 and the diameter of a spray pipe 12. This dimension ensures that there are appropriate gaps between the outer edge of the middle plate 11 and the inner wall of the impregnation tank 1, as well as between the inner edge of the middle plate 11 and the spindle shaft 4. This ensures that the middle plate 11 can accommodate large-sized graphite products and that the impregnation liquid and ultrasonic waves can flow freely in the gap between the plate and the tank wall. The diameter of the top plate 14 is the difference between the inner radius of the impregnation tank 1 and the diameter of a spray pipe 12. This dimension ensures that there are appropriate gaps between the outer edge of the top plate 14 and the spray pipe 12 fixed on the inner wall of the impregnation tank 1, avoiding interference and collision between the top plate 14 and the spray pipe 12 during rotation.

[0030] In addition, as attached Figure 3As shown, both the middle plate 11 and the top plate 14 include an outer ring frame 24 and a middle plate seat 26. The middle plate seat 26 is connected and fixed to the outer ring frame 24 by a plurality of evenly arranged connecting rods 25. The outer ring frame 24 is the outer circumferential frame structure of the plate body, and the middle plate seat 26 is the mounting seat in the center of the plate body. The middle plate seat 26 is connected to the outer end of the cantilever through a rotating joint. The plurality of connecting rods 25 are evenly distributed radially between the middle plate seat 26 and the outer ring frame 24, so that the plate body forms a hollow skeleton structure, reducing the weight of the plate body while ensuring structural strength. The middle plate 11 and the top plate 14 are fixed with a support mesh. The support mesh is a mesh structure with a uniform grid. The mesh aperture is smaller than the minimum external dimensions of the graphite product, so that the graphite product will not fall out of the grid when placed on the support mesh. At the same time, the mesh structure allows the impregnation liquid to pass freely from the top and bottom sides of the plate body, avoiding the plate body from forming a large area of ​​obstruction to the flow of impregnation liquid and the propagation of ultrasonic waves.

[0031] At least two spray pipes 12 are uniformly fixed around the inner wall of the impregnation tank 1 along the axial direction of the impregnation tank 1. Specifically, four spray pipes 12 can be set. The four spray pipes 12 are evenly distributed at 90-degree intervals along the circumference of the inner wall of the impregnation tank 1, so that the spray coverage area has no dead corners in the circumference. The lower end of the spray pipe 12 is closed. The spray pipe 12 is provided with multiple spray heads 2 corresponding to the outer side of the graphite products. The axial position of each spray head 2 on the spray pipe 12 corresponds to the height position of the middle plate 11 and the top plate 14, ensuring that the outer surface of each layer of graphite products can receive the direct scouring of the spray liquid.

[0032] The circulating spray system is used to supply impregnation liquid to the spray pipe 12 and circulate the impregnation liquid inside and outside. Specifically, the circulating spray system includes a circulating pump 6. The top side wall and bottom of the impregnation tank 1 are respectively provided with an inlet pipe 23 and an outlet pipe 7. The inlet and outlet of the circulating pump 6 are respectively connected to the outlet pipe 7 and the inlet pipe 23. After the circulating pump 6 is started, the impregnation liquid at the bottom of the impregnation tank 1 is drawn out through the outlet pipe 7, pressurized by the circulating pump 6, and then transported to the inlet pipe 23. The inlet pipe 23 then sends the liquid into the distributor at the top of the impregnation tank 1. In this structure, the final product is sprayed back into the impregnation tank 1 through the spray head 2 of the spray pipe 12, forming a complete circulation loop. This circulation process continues during the impregnation process, ensuring both forced flow and convection renewal of the impregnation solution, and making the concentration and temperature of the impregnation solution in the entire impregnation tank 1 tend to be uniform. If necessary, the impregnation tank 1 is equipped with a level gauge 15, which is used to display the liquid level height of the impregnation solution in the impregnation tank 1 in real time, providing liquid level information to the operator to ensure that the impregnation solution can completely submerge the graphite product and that the liquid level is within acceptable limits. Within the set range, the liquid level is kept within a safe range to prevent excessively high or low levels from affecting the normal operation of the circulation pump 6. A drain valve is installed at the outer end of the outlet pipe 7. This drain valve is used to drain the impregnation liquid from the impregnation tank 1 after impregnation, facilitating the removal of the impregnated graphite product. The inlet of the circulation pump 6 is connected to a supply pipe and a return pipe with valves. The return pipe is connected to the outlet pipe 7. The supply pipe is connected to an external impregnation liquid source and is used to inject fresh impregnation liquid into the impregnation tank 1 before impregnation begins. The valve on the supply pipe is used to control... The supply pipe controls the on / off state and supply flow rate; the return pipe is used to return the impregnation liquid discharged from the outlet pipe 7 to the impregnation tank 1 via the circulation pump 6, realizing the circulation spraying function; the valve on the return pipe is used to control the on / off state of the circulation loop; through the cooperation of the supply pipe and the return pipe, the circulation pump 6 can switch between the supply mode and the circulation mode. In the supply mode, fresh impregnation liquid from the external impregnation liquid source is pumped into the impregnation tank 1; in the circulation mode, the impregnation liquid at the bottom of the impregnation tank 1 is extracted and sprayed back onto the graphite product via the spray pipe 12.

[0033] In addition, a vertical distribution main pipe 20 is provided in the center of the top of the impregnation tank 1. The top of the distribution main pipe 20 is connected to the liquid inlet pipe 23. The bottom of the distribution main pipe 20 is closed. The side wall of the distribution main pipe 20 is connected to the top of the corresponding spray pipe 12 through the distribution branch pipe 16. The impregnation liquid delivered to the liquid inlet pipe 23 by the circulation pump 6 first enters the distribution main pipe 20, and is distributed to each distribution branch pipe 16 through the opening of the side wall of the distribution main pipe 20. Then, it flows into the corresponding spray pipe 12 through each distribution branch pipe 16. The bottom of the distribution main pipe 20 is closed so that the impregnation liquid will not flow directly down from the bottom, but will be forcibly distributed to each distribution branch pipe 16 and spray pipe 12 to ensure that the liquid supply pressure of each spray pipe 12 is balanced and to avoid the uneven liquid supply of each spray pipe 12, which would result in insufficient liquid output from some spray heads 2 and affect the uniformity of spray coverage. Spray heads 2 can also be installed on the lower wall of the distribution branch pipe 16 for spraying.

[0034] The impregnation equipment for graphite product production according to the present invention first opens the top cover 17 and places the graphite products to be impregnated on the support nets of the middle plate 11 and the top plate 14 respectively. After placement, the top cover 17 is sealed and fixed to the impregnation tank 1. Then, the vacuum system is turned on, the vacuum valve 22 is opened, and the vacuum pump is started to evacuate the impregnation tank 1, so that the inside of the impregnation tank 1 reaches a predetermined vacuum degree and is maintained for a certain period of time to fully expel the gas in the micropores of the graphite product. After the vacuum is completed, the vacuum valve 22 is closed, the circulation pump 6 is started and switched to the liquid supply mode, and the external impregnation liquid is supplied through the liquid supply pipe. The impregnation solution from the source is fed into the spray pipe 12 through the inlet pipe 23, the main distribution pipe 20, and the branch distribution pipe 16, and sprayed onto the surface of the graphite product by the spray head 2. As the impregnation solution is continuously injected, the liquid level in the impregnation tank 1 gradually rises until it completely submerges the graphite product. The liquid level is observed through the level gauge 15 and stopped after reaching the set height. Then, the pressurization system is started, and the compressed gas source and pressurization valve 21 are turned on to introduce compressed gas into the impregnation tank 1 to the set pressure and maintain the pressure. The compressed gas can be nitrogen. During the pressure-maintaining impregnation process, the heating system is started, and the heating medium is introduced into the circulation inlet pipe of the jacket 13. The impregnation liquid in the impregnation tank 1 is heated by the jacket 13, and the temperature of the impregnation liquid is monitored by the thermometer 5 and kept within the process setting range. The drive motor 8 is started to drive the pivot shaft 4 to rotate, which drives the cantilever middle rod 10 and the cantilever top rod 3, as well as the placement middle plate 11 and placement top plate 14 on them, to revolve around the axis of the pivot shaft 4. At the same time, the placement middle plate 11 and placement top plate 14 rotate under the resistance of the impregnation liquid or the action of spray circulation, so that the graphite product moves continuously in the impregnation liquid. The ultrasonic generator 9 is started to apply ultrasonic vibration to the impregnation liquid through the ultrasonic transducer. The circulation pump 6 is started and switched. In circulation mode, the impregnation liquid at the bottom of the impregnation tank 1 is circulated and sprayed onto the surface of each graphite product through the outlet pipe 7, return pipe, circulation pump 6, inlet pipe 23, main distribution pipe 20, branch distribution pipe 16, spray pipe 12, and spray head 2, continuously maintaining forced convection and uniform concentration of the impregnation liquid. After the set impregnation time is reached, the drive motor 8, ultrasonic generator 9, circulation pump 6, and heating system are turned off. The exhaust valve on the drain pipe 18 is opened to release the pressure inside the impregnation tank 1, and the impregnation liquid is discharged through the discharge valve. After the impregnation liquid is drained, the top cover 17 is opened, and the impregnated graphite product can be taken out.

[0035] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this invention, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. An impregnation apparatus for producing graphite products, comprising an impregnation tank, a vacuum system for evacuating the impregnation tank, and a pressurization system for introducing pressurized gas into the impregnation tank, wherein the impregnation tank is provided with a detachable and fixed top cover, and an ultrasonic generator is provided at the bottom of the impregnation tank, characterized in that: The equipment also includes a circulating spray system, a rotating bearing device, and a heating system for heating the impregnation liquid. The rotating bearing device includes a rotating support shaft coaxially disposed inside the impregnation tank. The lower end of the rotating support shaft rotatably seals through the bottom of the impregnation tank and is connected to a drive motor. The top end of the rotating support shaft is close to the middle of the impregnation tank. Two cantilevered middle rods and two cantilevered top rods are symmetrically fixed to the middle shaft and the top shaft, respectively, and the two cantilevered middle rods and two cantilevered top rods are arranged radially in a cross shape. The upper surface of the outer ends of the cantilevered middle rods and cantilevered top rods are rotatably mounted with a placement plate and a placement plate for placing graphite products, respectively. At least two spray pipes are uniformly and fixed around the inner wall of the impregnation tank along the axial direction of the impregnation tank. The spray pipes are provided with multiple spray heads corresponding to the outer side of the graphite products. The circulating spray system is used to supply impregnation liquid to the spray pipes and circulate the impregnation liquid inside and outside.

2. The impregnation equipment for graphite product production according to claim 1, characterized in that: The circulating spraying system includes a circulating pump. The top side wall and bottom of the impregnation tank are respectively provided with an inlet pipe and an outlet pipe. The inlet and outlet of the circulating pump are respectively connected to the outlet pipe and the inlet pipe.

3. The impregnation equipment for graphite product production according to claim 2, characterized in that: The impregnation tank is equipped with a level gauge, the outer end of the outlet pipe is equipped with a discharge valve, the inlet of the circulation pump is connected to a supply pipe and a return pipe with valves respectively, the return pipe is connected to the outlet pipe, and the supply pipe is connected to an external impregnation liquid source.

4. The impregnation equipment for graphite product production according to claim 2, characterized in that: The impregnation tank has a vertical distribution main pipe at the center of its inner top. The top end of the distribution main pipe is connected to the liquid inlet pipe, the bottom end of the distribution main pipe is closed, and the side wall of the distribution main pipe is connected to the top end of the corresponding spray pipe through a distribution branch pipe.

5. The impregnation equipment for graphite product production according to claim 1, characterized in that: The heating system includes a jacket that is fixed to the outer wall of the impregnation tank. The bottom and top of the jacket are respectively provided with a circulation inlet pipe and a circulation outlet pipe. A thermometer is installed at the bottom of the impregnation tank.

6. The impregnation equipment for graphite product production according to claim 1, characterized in that: The diameter of the middle plate is half the difference between the inner diameter of the immersion tank and the diameter of the pivot shaft, and the diameter of the top plate is the difference between the inner radius of the immersion tank and the diameter of a spray pipe.

7. The impregnation equipment for graphite product production according to claim 1, characterized in that: Both the middle plate and the top plate include an outer ring frame and a middle plate base. The middle plate base is connected and fixed to the outer ring frame by a plurality of evenly arranged connecting rods. The surfaces of the middle plate and the top plate are fixed with a support net.

8. The impregnation equipment for graphite product production according to claim 1, characterized in that: The ultrasonic generating device includes an ultrasonic transducer and an ultrasonic generator. The ultrasonic transducer is disposed on the inner wall of the bottom side of the impregnation tank, and the ultrasonic generator is disposed on the outside of the impregnation tank and electrically connected to the ultrasonic transducer.

9. The impregnation equipment for graphite product production according to claim 1, characterized in that: The pressurization system includes a compressed gas source and a pressurization pipeline. One end of the pressurization pipeline is connected to the impregnation tank, and the other end is connected to the compressed gas source. A pressurization valve is provided on the pressurization pipeline. A pressure gauge and an venting pipe with an exhaust valve are provided on the top of the impregnation tank.

10. The impregnation equipment for graphite product production according to claim 1, characterized in that: The vacuum system includes a vacuum pump and a vacuum pipeline. One end of the vacuum pipeline is connected to the impregnation tank, and the other end is connected to the vacuum pump. A vacuum valve is provided on the vacuum pipeline.

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