Preparation equipment and method of flexible graphite plate

Abstract

The application provides a preparation equipment and method of flexible graphite plate, which comprises a tank body, and further comprises: a pair of raw material tanks fixedly installed at the top of the tank body, a square discharge port extending to the top of the tank body being arranged at the bottom of the raw material tank, and a dispersion discharging mechanism being installed in the square discharge port; a pair of pretreatment channels fixedly installed at the two sides of the tank body and extending in a zigzag shape, the top inlet of the pretreatment channel corresponding to the square discharge port, and an acid mist pipeline extending along the channel direction being installed in the pretreatment channel; a ring plate and a plurality of treatment tanks fixedly arranged on the ring plate in a circumferential direction, the ring plate being rotationally connected in the tank body, a pair of feeding positions, a pair of acid treatment positions and a pair of water washing and discharging positions being sequentially arranged at the two sides of the ring plate along the rotation direction, and the outlet of the pretreatment channel corresponding to the feeding position. The equipment can integrate the acid treatment and water washing processes, the waste acid after atomization acid treatment can be used for pretreatment of graphite, the acid treatment time is shortened, and the graphite after water washing can be dispersed, so that the subsequent expansion effect is improved.

Description

Technical Field

[0001] This invention relates to the field of flexible graphite plate production technology, and in particular to a preparation equipment and method for flexible graphite plates. Background Technology

[0002] Flexible graphite sheets are the base material for various flexible graphite seals. They are pure graphite products made from natural flake graphite through special chemical treatment, heat treatment, and pressure processing, and contain no binders. In addition to retaining the characteristics of natural flake graphite, they also have the advantages of being soft, malleable, elastic, resistant to high and low temperatures, corrosion-resistant, resistant to high doses of radiation, and having a low coefficient of friction.

[0003] The preparation of flexible graphite sheets requires steps such as acid treatment, water washing, expansion and calendering, and requires multiple sets of equipment to complete, resulting in low integration. In particular, the existing acid treatment and water washing processes require a long soaking time, resulting in low processing efficiency. Furthermore, the graphite after water washing is prone to sticking together, and the direct expansion effect is poor. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a device and method for preparing flexible graphite sheets. This device integrates the acid treatment and water washing processes, can atomize the waste acid after acid treatment to pretreat the graphite, shortening the acid treatment time, and can also disperse the washed graphite to improve the subsequent expansion effect.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows: A flexible graphite sheet preparation apparatus includes a tank and further includes: A pair of raw material tanks are fixedly installed on the top of the tank body. The bottom of the raw material tank is provided with a square discharge port that extends into the top of the tank body. A dispersing and feeding mechanism is installed in the square discharge port. A pair of pretreatment channels are fixedly installed on both sides of the tank and extend in a zigzag pattern. The top inlet corresponds to a square outlet, and an acid mist pipeline extending along the channel direction is installed inside. An annular plate and multiple processing tanks fixed circumferentially thereon. The annular plate is rotatably connected to the tank body. A pair of feeding positions, a pair of acid treatment positions and a pair of water washing discharging positions are arranged sequentially on both sides of the annular plate along the rotation direction. The outlet of the pretreatment channel corresponds to the feeding position. Two pairs of liquid inlet stirring mechanisms are installed at the top of the tank body in a height-adjustable manner, corresponding to a pair of acid treatment positions and a pair of water washing material discharge positions respectively. They include multiple vertical stirring tubes for insertion into the treatment tank for stirring. The side walls of the stirring tubes are provided with multiple pipe holes for discharging acid, water and hot gas.

[0006] Preferably, the dispersing and feeding mechanism includes a drive shaft that is vertically rotatably installed inside the tank. A transmission box is provided at the top of the tank. The drive shaft extends into the transmission box and is fixed with a cam. Both sides of the transmission box are elastically mounted with a stop rod by springs. The inner end of the stop rod is equipped with a roller that abuts the cam. The outer end of the stop rod extends out of the transmission box and passes through a square discharge port. Multiple dispersing rods are fixedly installed at intervals on a section of the stop rod located inside the square discharge port.

[0007] Preferably, a first cylinder is installed on both sides of the tank body. The telescopic end of the first cylinder is fixedly connected to a pull rod through a connecting arm. An opening and closing plate is fixedly installed at the end of the pull rod. The opening and closing plate extends into the tank body and blocks the bottom of the square discharge port.

[0008] Preferably, a receiving hopper is connected to the top inlet of the pretreatment channel, the acid mist pipeline extends along the sliding surface of the raw material in the pretreatment channel, and multiple acid mist holes are provided on both sides of the acid mist pipeline.

[0009] Preferably, a cover plate is fixedly installed inside the tank, and the openings of the plurality of processing tanks are open and abut against the cover plate. The cover plate has a plurality of openings on its circumference corresponding to a pair of feeding positions, a pair of acid treatment positions and a pair of water washing positions. The outlet of the pretreatment channel corresponds to the opening at the feeding position, and a plurality of liquid inlet stirring mechanisms correspond to the openings at the pair of acid treatment positions and the pair of water washing positions, respectively.

[0010] Preferably, the liquid inlet stirring mechanism includes a hydraulic cylinder fixedly installed on the top of the tank. The telescopic end of the hydraulic cylinder extends into the tank and is fixed with a hanging plate. A liquid inlet pipe is rotatably connected to the hanging plate. Multiple stirring pipes are connected to the liquid inlet pipe. The upper end of the liquid inlet pipe is connected to a connecting pipe through a rotary joint. A first motor is installed on the hanging plate. The output end of the first motor is connected to the liquid inlet pipe through a pair of transmission gears. The size of the hanging plate is adapted to the opening.

[0011] Preferably, a drive box is fixedly installed on the side wall of the tank, a second motor is installed on the top of the drive box, the output end of the second motor extends into the drive box and is fixed with a drive gear, a gear ring is embedded and fixed on the circumferential side wall of the annular plate, and the drive gear extends into the tank and meshes with the gear ring.

[0012] Preferably, an annular dispersion box is fixedly installed at the bottom of the tank. An annular filter screen is circumferentially fitted on the annular dispersion box. A rotating ring is rotatably connected to the inner wall of the annular dispersion box. Multiple L-shaped dispersion plates rotating in the same direction are fixed on the circumference of the rotating ring. A docking mechanism for connecting with the processing tank is installed at the top of the annular dispersion box corresponding to a pair of water washing discharge positions. A discharge port is provided on both sides of the annular filter screen. A discharge pipe is connected to the discharge port. An opening and closing component is installed inside the discharge port. The lower end of the drive shaft extends into the annular dispersion box and is fixed with a turntable. Magnetic rings with mutual attraction are embedded in the circumferential sidewalls of the turntable and the circumferential sidewalls of the rotating ring. The bottom of the L-shaped dispersion plate is attached to the bottom of the annular dispersion box, and its sidewall is attached to the annular filter screen.

[0013] Preferably, the docking mechanism includes a second cylinder installed on the top of the annular dispersion box. The telescopic end of the second cylinder is fixedly connected to a connecting pipe via a connecting plate. The bottom of the treatment tank is provided with a discharge pipe adapted to the connecting pipe. A valve is installed inside the discharge pipe. The lower end of the connecting pipe extends into the annular dispersion box. A discharge pipe is connected to the side wall of the connecting pipe. A baffle is installed inside the connecting pipe. Atomizers are installed on the side wall of the tank corresponding to a pair of water washing discharge positions. A recovery pipe is connected between the liquid inlet end of the atomizer and the discharge pipe. A three-way valve is installed at the connection points of the discharge pipe with the recovery pipe and the connecting pipe. The mist outlet end of the atomizer is connected to an acid mist pipeline via a pipe.

[0014] This invention also provides a method for preparing flexible graphite sheets, comprising the following steps: S1. Pour powdered natural flake graphite into a pair of raw material tanks. The powdered natural flake graphite is evenly fed through the dispersing and feeding mechanism. The powdered natural flake graphite slides evenly in the pretreatment channel. The atomized acidic liquid is discharged through multiple acid mist holes on both sides of the acid mist pipeline, contacting the sliding natural flake graphite to achieve the initial acid treatment process and reduce the subsequent soaking time. S2. The pretreated natural flake graphite falls into the treatment tank at a pair of feeding positions. It rotates to the acid treatment position with the ring plate, and the corresponding liquid inlet stirring mechanism is lowered into the treatment tank. The mixed liquid of concentrated sulfuric acid and nitric acid is injected through the corresponding connecting pipe, and then enters multiple stirring pipes through the liquid inlet pipe. Finally, it is discharged into the treatment tank through multiple pipe holes. With the help of stirring, the acid liquid and powdered natural flake graphite are fully mixed to complete the acid treatment process. S3. After acid treatment, the material is transferred to the water washing discharge position. The corresponding liquid inlet stirring mechanism descends into the treatment tank and injects clean water through the corresponding connecting pipe. With stirring, excess acid is quickly washed away and a small amount of water is introduced into the tank as an expansion aid. The acid in the initial water washing stage is sent into the atomizer through the docking mechanism for atomization. The atomized acid mist is sent into the pretreatment channel. The liquid in the later water washing stage is discharged through the discharge pipe. S4. After washing with water, hot air is introduced into the corresponding connecting pipe. The hot air enters the treatment tank and, together with stirring, blows out excess water on the one hand and loosens the washed graphite on the other hand. Finally, it is blown into the annular dispersion box through the connecting pipe. S5. Multiple L-shaped dispersion plates in the annular dispersion box rotate circumferentially. While throwing out excess water from the graphite through the annular filter, the graphite is further dispersed. Finally, the discharge port opens, and the loose graphite is collected and scraped to the discharge port and thrown out through the discharge pipe. The loose graphite is sent into the expansion furnace for heating and expansion into expanded graphite. The expanded graphite is then rolled into flexible graphite sheets.

[0015] The beneficial effects of this invention are as follows: 1. By installing a pair of raw material tanks, an annular plate, multiple processing tanks, a pair of feeding positions, a pair of acid treatment positions, and a pair of water washing positions, the acid treatment and water washing processes are integrated. The second motor is started, and the gear ring is driven to rotate through the drive gear, which in turn drives the multiple processing tanks to rotate through the annular plate. This allows multiple pairs of processing tanks to rotate synchronously to a pair of feeding positions, a pair of acid treatment positions, and a pair of water washing positions, enabling simultaneous feeding, acid treatment, and water washing processes, which greatly improves the preparation efficiency.

[0016] 2. By installing a dispersing feeding mechanism, a pretreatment channel, and an atomizer, the drive shaft drives the cam to rotate. Through the cooperation of springs and rollers, the push rod moves back and forth, which in turn drives multiple dispersing rods to move back and forth quickly. This achieves a uniform feeding process and avoids clumping. Powdered natural flake graphite slides evenly in the pretreatment channel. The waste acid after acid treatment is atomized by the atomizer. The atomized acidic liquid is discharged through multiple acid mist holes on both sides of the acid mist pipeline, contacting the sliding natural flake graphite to achieve the initial acid treatment process and reduce the subsequent soaking time.

[0017] 3. By installing an inlet stirring mechanism, the corresponding inlet stirring mechanism is lowered into the treatment tank. The mixed liquid of concentrated sulfuric acid and nitric acid is injected through the corresponding connecting pipe, and then enters multiple stirring tubes through the inlet pipe. Finally, it is discharged into the treatment tank through multiple pipe holes. The stirring process ensures that the acid solution and powdered natural flake graphite are thoroughly mixed, completing the acid treatment process. After acid treatment, the tank is moved to the water washing discharge position. The corresponding inlet stirring mechanism is lowered into the treatment tank, and clean water is injected through the corresponding connecting pipe. Combined with stirring, excess acid solution is quickly washed away. A small amount of water is introduced into the system as an expansion agent. The acid solution in the initial stage of water washing is sent into the atomizer through the docking mechanism and atomized. The atomized acid mist is sent into the pretreatment channel, and the liquid in the later stage of water washing is discharged through the discharge pipe. After water washing, hot air is introduced into the corresponding connecting pipe. The hot air enters the treatment tank and, together with stirring, blows out excess water and loosens the washed graphite. Finally, it is blown into the annular dispersion box through the docking pipe, which speeds up the acid treatment and water washing time, allows the acid and water to fully contact the graphite, and improves the acid treatment and water washing effect.

[0018] 4. By installing an annular dispersion box, multiple L-shaped dispersion plates inside the annular dispersion box rotate circumferentially. While throwing out excess water in the graphite through the annular filter screen, the graphite is further dispersed. Finally, the discharge port opens, and the loose graphite is collected and scraped to the discharge port and thrown out through the discharge pipe, improving the subsequent expansion effect. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a bottom-view perspective view of the present invention; Figure 3 This is a three-dimensional view of the annular plate proposed in this invention; Figure 4 This is a cross-sectional view of the present invention; Figure 5 This is a cross-sectional schematic diagram of the transmission box proposed in this invention; Figure 6 This is a three-dimensional view of the preprocessing channel proposed in this invention; Figure 7 This is a cross-sectional schematic diagram of the preprocessing channel proposed in this invention; Figure 8 This is a perspective view of the liquid inlet stirring mechanism proposed in this invention; Figure 9 This is a three-dimensional view of the docking mechanism proposed in this invention.

[0020] In the diagram: 1. Tank body, 2. Raw material tank, 3. Hydraulic cylinder, 4. Drive shaft, 5. Square discharge port, 6. Dispersing rod, 7. Transmission box, 8. First cylinder, 9. Opening and closing plate, 10. Pull rod, 11. Receiving hopper, 12. Pre-treatment channel, 13. Cover plate, 14. Opening, 15. Annular plate, 16. Processing tank, 17. Discharge pipe, 18. Second motor, 19. Drive box, 20. Drive gear, 21. Atomizer, 22. Discharge pipe, 23. Recovery pipe, 24. Connecting pipe, 25. Three-way valve, 26. Second cylinder, 27. Discharge pipe, 28. Annular filter screen, 29. Annular dispersion box, 30. Turntable, 31. Magnetic ring, 32. L-shaped dispersion plate, 33 gear ring, 34 hanging plate, 35 first motor, 36 transmission gear, 37 connecting pipe, 38 liquid inlet pipe, 39 stirring pipe, 40 pipe hole, 41 cam, 42 push rod, 43 spring, 44 acid mist pipeline, 45 feeding position, 46 acid treatment position, 47 water washing discharge position. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Reference Figures 1-9 A flexible graphite sheet preparation device, comprising a tank 1, and further comprising: A pair of raw material tanks 2 are fixedly installed on the top of the tank body 1. The bottom of the raw material tank 2 is provided with a square discharge port 5 extending into the top of the tank body 1. A dispersing feeding mechanism is installed in the square discharge port 5.

[0024] Specifically, the dispersing mechanism includes a drive shaft 4 vertically rotatably installed inside the tank 1. A transmission box 7 is provided at the top of the tank 1. The drive shaft 4 extends into the transmission box 7 and is fixed with a cam 41. Both sides of the transmission box 7 are elastically mounted with abutment rods 42 via springs 43. The inner end of the abutment rod 42 is equipped with a roller that abuts the cam 41. The outer end of the abutment rod 42 extends out of the transmission box 7 and passes through the square discharge port 5. Multiple dispersing rods 6 are fixedly installed at intervals on a section of the abutment rod 42 located inside the square discharge port 5. The drive shaft 4 drives the cam 41 to rotate. Through the cooperation of the springs 43 and the rollers, the abutment rod 42 is driven to move back and forth, thereby driving the multiple dispersing rods 6 to move back and forth quickly from left to right, which can achieve a uniform dispensing process and avoid clumping.

[0025] Furthermore, a first cylinder 8 is installed on both sides of the tank body 1. The telescopic end of the first cylinder 8 is fixedly connected to a pull rod 10 through a connecting arm. An opening and closing plate 9 is fixedly installed at the end of the pull rod 10. The opening and closing plate 9 extends into the tank body 1 and blocks the bottom of the square discharge port 5. When the first cylinder 8 is started, the pull rod 10 is moved, which in turn moves the opening and closing plate 9 to open the square discharge port 5.

[0026] A pair of pretreatment channels 12 are fixedly installed on both sides of the tank body 1 and extend in a zigzag shape. The top inlet corresponds to the square outlet 5. An acid mist pipe 44 extending along the channel direction is installed inside. A receiving hopper 11 is connected to the top inlet of the pretreatment channel 12. The acid mist pipe 44 extends along the sliding surface of the raw material in the pretreatment channel 12. Multiple acid mist holes are provided on both sides of the acid mist pipe 44. The material falls into the pretreatment channel 12 through the receiving hopper 11 and slides down inside. The atomized acidic liquid is discharged through the multiple acid mist holes on both sides of the acid mist pipe 44 and contacts the sliding natural flake graphite. Because the pretreatment channel 12 extends in a zigzag shape, the pretreatment time is sufficient to achieve the initial acid treatment process and reduce the subsequent soaking time.

[0027] An annular plate 15 and multiple processing tanks 16 circumferentially fixed thereon are arranged on both sides of the annular plate 15, which is rotatably connected inside the tank body 1. Along the rotation direction, the annular plate 15 has a pair of loading positions 45, a pair of acid treatment positions 46, and a pair of water washing unloading positions 47. The outlet of the pretreatment channel 12 corresponds to the loading position 45. A drive box 19 is fixedly installed on the side wall of the tank body 1. A second motor 18 is installed on the top of the drive box 19. The output end of the second motor 18 extends into the drive box 19 and is fixed with a drive gear 20. A gear ring 33 is embedded and fixed on the circumferential side wall of the annular plate 15. The drive gear 20 extends into the tank body 1 and meshes with the gear ring 33. When the second motor 18 is started, the gear ring 33 is rotated via the drive gear 20, which in turn drives the multiple processing tanks 16 to rotate via the annular plate 15. This allows multiple pairs of processing tanks 16 to simultaneously rotate to the loading position 45, the acid treatment position 46, and the water washing unloading position 47, enabling simultaneous loading, acid treatment, and water washing processes, greatly improving preparation efficiency.

[0028] Furthermore, a cover plate 13 is fixedly installed inside the tank body 1. The openings of multiple processing tanks 16 are set open and abut against the cover plate 13. The cover plate 13 has multiple openings 14 on its circumference corresponding to a pair of loading positions 45, a pair of acid treatment positions 46 and a pair of water washing unloading positions 47. The outlet of the pretreatment channel 12 corresponds to the opening 14 at the loading position 45. Multiple liquid inlet stirring mechanisms correspond to the openings 14 at the pair of acid treatment positions 46 and the pair of water washing unloading positions 47 respectively. The cover plate 13 can reduce liquid splashing.

[0029] Two pairs of liquid inlet stirring mechanisms are installed at the top of the tank 1 in a height-adjustable manner, corresponding to a pair of acid treatment positions 46 and a pair of water washing discharge positions 47 respectively. They include multiple vertical stirring pipes 39, which are inserted into the treatment tank 16 for stirring. The side wall of the stirring pipe 39 is provided with multiple pipe holes 40, which can discharge acid, water and hot gas.

[0030] Specifically, the liquid inlet stirring mechanism includes a hydraulic cylinder 3 fixedly installed on the top of the tank 1. The telescopic end of the hydraulic cylinder 3 extends into the tank 1 and is fixed with a hanging plate 34. A liquid inlet pipe 38 is rotatably connected to the hanging plate 34. Multiple stirring pipes 39 are connected to the liquid inlet pipe 38. The upper end of the liquid inlet pipe 38 is connected to a connecting pipe 37 through a rotary joint. A first motor 35 is installed on the hanging plate 34. The output end of the first motor 35 is connected to the liquid inlet pipe 38 through a pair of transmission gears 36. The size of the hanging plate 34 is adapted to the opening 14. When the hydraulic cylinder 3 is started, the hanging plate 34 is lowered, and multiple stirring pipes 39 can be inserted into the processing tank 16 through the opening 14. When the first motor 35 is started, the liquid inlet pipe 38 is rotated through a pair of transmission gears 36, which in turn drives the multiple stirring pipes 39 to rotate, realizing the stirring process. The connecting pipe 37 does not need to rotate with the liquid inlet pipe 38.

[0031] An annular dispersion box 29 is fixedly installed at the bottom of the tank body 1. An annular filter screen 28 is circumferentially fitted on the annular dispersion box 29. A rotating ring is rotatably connected to the inner wall of the annular dispersion box 29. Multiple L-shaped dispersion plates 32 rotating circumferentially are fixed on the circumference of the rotating ring. A docking mechanism for docking with the processing tank 16 is installed at the top of the annular dispersion box 29 corresponding to a pair of water washing discharge positions 47. Both sides of the annular filter screen 28 are provided with discharge ports, and discharge pipes 27 are connected to the discharge ports. An opening and closing component is installed inside the discharge port. The lower end of the drive shaft 4 extends into the annular dispersion box 29 and is fixed with a turntable 30. The circumferential sidewalls of the 30 and the circumferential sidewalls of the rotating ring are both embedded with magnetic rings 31 that attract each other. The bottom of the L-shaped dispersion plate 32 is attached to the bottom of the annular dispersion box 29, and the sidewall is attached to the annular filter screen 28. The drive shaft 4 drives the rotating disk 30 to rotate synchronously. Under the magnetic attraction of the inner and outer magnetic rings 31, the rotating ring rotates synchronously with the rotating disk 30, which in turn drives the multiple L-shaped dispersion plates 32 in the annular dispersion box 29 to rotate circumferentially. While throwing out the excess water in the graphite through the annular filter screen 28, the graphite is further dispersed. Finally, the discharge port opens, and the loose graphite is collected and scraped to the discharge port and thrown out through the discharge pipe 27.

[0032] Specifically, the docking mechanism includes a second cylinder 26 installed on the top of the annular dispersion box 29. The telescopic end of the second cylinder 26 is fixedly connected to a connecting pipe 24 via a connecting plate. The bottom of the processing tank 16 is provided with a discharge pipe 17 adapted to the connecting pipe 24. A valve is installed inside the discharge pipe 17. The lower end of the connecting pipe 24 extends into the annular dispersion box 29. A discharge pipe 22 is connected to the side wall of the connecting pipe 24. A baffle is installed inside the connecting pipe 24. Atomizers 21 are installed on the side wall of the tank 1 at a pair of water washing discharge positions 47. A recovery pipe 23 is connected between the liquid inlet end of the atomizer 21 and the discharge pipe 22. Three-way valves 25 are installed at the connection points of the atomizer 21 with the recovery pipe 23 and the connecting pipe 24 respectively. The mist outlet of the atomizer 21 is connected to the acid mist pipeline 44 through a pipe. The second cylinder 26 is started to drive the connecting pipe 24 to rise and connect with the discharge pipe 17. The valve in the discharge pipe 17 is opened, and the three-way valve 25 is connected to the connecting pipe 24 and the discharge pipe 22 to realize the discharge process of acid and wastewater. Waste acid enters the atomizer 21 through the recovery pipe 23 for atomization and reuse, and wastewater is directly discharged through the discharge pipe 22. The three-way valve 25 is connected to the connecting pipe 24, and the discharge pipe 22 is closed to realize the discharge process of graphite.

[0033] The method for preparing flexible graphite sheets using the above-mentioned equipment includes the following steps: S1. Pour powdered natural flake graphite into a pair of raw material tanks 2. Drive shaft 4 drives cam 41 to rotate. Through the cooperation of spring 43 and roller, push rod 42 moves back and forth, which in turn drives multiple dispersing rods 6 to move back and forth quickly, which can achieve uniform feeding process and avoid agglomeration. Start the first cylinder 8 to drive pull rod 10 to move, which can drive opening and closing plate 9 to move, open square discharge port 5, and powdered natural flake graphite falls evenly. It falls into pretreatment channel 12 through receiving hopper 11 and slides down in it. Atomized acidic liquid is discharged through multiple acid mist holes on both sides of acid mist pipe 44, contacting the sliding natural flake graphite. Since the pretreatment channel 12 extends in a zigzag shape, the pretreatment time is sufficient to achieve the initial acid treatment process and reduce the subsequent soaking time. S2. The pretreated natural flake graphite falls into the treatment tanks 16 at a pair of feeding positions 45. The second motor 18 is started, which drives the gear ring 33 to rotate through the drive gear 20. This, in turn, drives multiple treatment tanks 16 to rotate through the annular plate 15. As the annular plate 15 rotates to the acid treatment position 46, the corresponding liquid inlet stirring mechanism is lowered into the treatment tank 16. The mixed liquid of concentrated sulfuric acid and nitric acid is injected through the corresponding connecting pipe 37, and then enters multiple stirring pipes 39 through the liquid inlet pipe 38. Finally, it is discharged into the treatment tank 16 through multiple pipe holes 40. With the stirring, the acid liquid and the powdered natural flake graphite are fully contacted to complete the acid treatment process. The hydraulic cylinder 3 is started to lower the hanging plate 34, which allows multiple stirring tubes 39 to be inserted into the treatment tank 16 through the opening 14. The first motor 35 is started, which drives the liquid inlet pipe 38 to rotate through a pair of transmission gears 36, thereby driving the multiple stirring tubes 39 to rotate and realizing the stirring process. The connecting pipe 37 does not need to rotate with the liquid inlet pipe 38.

[0034] S3. After acid treatment, the material is transferred to the water washing discharge position 47. The corresponding liquid inlet stirring mechanism descends into the treatment tank 16 and clean water is injected through the corresponding connecting pipe 37. With stirring, excess acid is quickly washed away and a small amount of water is introduced into the tank as an expansion agent. The acid in the initial water washing stage is sent into the atomizer 21 through the docking mechanism for atomization. The atomized acid mist is sent into the pretreatment channel 12 to make use of the waste acid. The liquid in the later water washing stage is discharged through the discharge pipe 22. The second cylinder 26 is activated to drive the connecting pipe 24 to rise and connect with the discharge pipe 17. The valve in the discharge pipe 17 is opened, and the three-way valve 25 is connected to the connecting pipe 24 and the discharge pipe 22, thus realizing the discharge process of acid and wastewater. The waste acid enters the atomizer 21 through the recovery pipe 23 for atomization and reuse, and the wastewater is directly discharged through the discharge pipe 22. The three-way valve 25 is connected to the connecting pipe 24, and the discharge pipe 22 is closed, thus realizing the discharge process of graphite.

[0035] S4. After washing with water, hot air is introduced into the corresponding connecting pipe 37. The hot air enters the treatment tank 16 and, with the help of stirring, blows out excess water on the one hand and loosens the washed graphite on the other hand. Finally, it is blown into the annular dispersion box 29 through the connecting pipe 24. S5 and drive shaft 4 synchronously drive turntable 30 to rotate. Under the magnetic attraction of inner and outer magnetic rings 31, the ring rotates synchronously with turntable 30, thereby driving multiple L-shaped dispersion plates 32 in the annular dispersion box 29 to rotate circumferentially. While throwing out excess water in the graphite through the annular filter screen 28, the graphite is further dispersed. Finally, the discharge port opens, and the loose graphite is collected and scraped to the discharge port and thrown out through the discharge pipe 27. The loose graphite is sent into the expansion furnace for heating and expansion into expanded graphite. The expanded graphite is rolled into flexible graphite sheets.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a flexible graphite sheet, characterized in that, Includes the following steps: S1. Pour powdered natural flake graphite into a pair of raw material tanks (2). The powdered natural flake graphite is evenly fed through the dispersing feeding mechanism. The powdered natural flake graphite slides evenly in the pretreatment channel (12). The atomized acidic liquid is discharged through multiple acid mist holes on both sides of the acid mist pipeline (44) and comes into contact with the sliding natural flake graphite to achieve the initial acid treatment process and reduce the subsequent soaking time. S2. The pretreated natural flake graphite falls into the treatment tank (16) at a pair of feeding positions (45). It rotates to the acid treatment position (46) with the ring plate (15). The corresponding liquid inlet stirring mechanism is lowered into the treatment tank (16). The mixed liquid of concentrated sulfuric acid and nitric acid is injected through the corresponding connecting pipe (37), and then enters multiple stirring pipes (39) through the liquid inlet pipe (38). Finally, it is discharged into the treatment tank (16) through multiple pipe holes (40). With the stirring, the acid liquid and the powdered natural flake graphite are fully stirred to complete the acid treatment process. S3. After acid treatment, the material is transferred to the water washing discharge position (47). The corresponding liquid inlet stirring mechanism is lowered into the treatment tank (16). Clean water is injected through the corresponding connecting pipe (37). The excess acid is quickly washed away with stirring, and a small amount of water is introduced into the water as an expansion aid. The acid in the initial water washing stage is sent into the atomizer (21) through the docking mechanism for atomization. The atomized acid mist is sent into the pretreatment channel (12). The liquid in the later water washing stage is discharged through the discharge pipe (22). S4. After washing with water, hot air is introduced into the corresponding connecting pipe (37). The hot air enters the treatment tank (16) and, with the help of stirring, blows out excess water on the one hand and loosens the washed graphite on the other hand. Finally, it is blown into the annular dispersion box (29) through the connecting pipe (24). S5. Multiple L-shaped dispersion plates (32) in the annular dispersion box (29) rotate circumferentially. While throwing out excess water in the graphite through the annular filter screen (28), the graphite is further dispersed. Finally, the discharge port opens, and the loose graphite is collected and scraped to the discharge port and thrown out through the discharge pipe (27). The loose graphite is sent into the expansion furnace for heating and expansion into expanded graphite. The expanded graphite is rolled into flexible graphite sheets.

2. A flexible graphite sheet preparation apparatus, applied to the flexible graphite sheet preparation method of claim 1, comprising a tank (1), characterized in that, Also includes: A pair of raw material tanks (2) are fixedly installed on the top of the tank body (1). The bottom of the raw material tank (2) is provided with a square discharge port (5) extending into the top of the tank body (1). A dispersing feeding mechanism is installed in the square discharge port (5). A pair of pretreatment channels (12) are fixedly installed on both sides inside the tank (1) and extend in a zigzag shape. The top inlet corresponds to a square outlet (5), and an acid mist pipeline (44) extending along its channel direction is installed inside. The annular plate (15) and a plurality of processing tanks (16) are fixed thereon. The annular plate (15) is rotatably connected inside the tank body (1). A pair of feeding positions (45), a pair of acid treatment positions (46) and a pair of water washing discharging positions (47) are arranged in sequence on both sides of the annular plate (15) along the rotation direction. The outlet of the pretreatment channel (12) corresponds to the feeding position (45). Two pairs of liquid inlet stirring mechanisms are installed at the top of the tank (1) in a height-adjustable manner, corresponding to a pair of acid treatment positions (46) and a pair of water washing discharge positions (47) respectively. They include multiple vertical stirring tubes (39) for insertion into the treatment tank (16) for stirring. The side wall of the stirring tube (39) is provided with multiple pipe holes (40) to discharge acid, water and hot gas.

3. The equipment for preparing flexible graphite sheets according to claim 2, characterized in that, The dispersing mechanism includes a drive shaft (4) that is vertically rotatably installed inside the tank (1). The top of the tank (1) is provided with a transmission box (7). The drive shaft (4) extends into the transmission box (7) and is fixed with a cam (41). Both sides of the transmission box (7) are elastically installed with a stop rod (42) by a spring (43). The inner end of the stop rod (42) is equipped with a roller that abuts the cam (41). The outer end of the stop rod (42) extends out of the transmission box (7) and passes through the square discharge port (5). A number of dispersing rods (6) are fixedly installed at intervals on a section of the stop rod (42) located inside the square discharge port (5).

4. The equipment for preparing flexible graphite sheets according to claim 3, characterized in that, A first cylinder (8) is installed on both sides of the tank (1). The telescopic end of the first cylinder (8) is fixedly connected to a pull rod (10) through a connecting arm. An opening and closing plate (9) is fixedly installed at the end of the pull rod (10). The opening and closing plate (9) extends into the tank (1) and blocks the bottom of the square discharge port (5).

5. The equipment for preparing flexible graphite sheets according to claim 4, characterized in that, The top entrance of the pretreatment channel (12) is connected to a receiving hopper (11), and the acid mist pipeline (44) extends along the sliding surface of the raw material in the pretreatment channel (12). Multiple acid mist holes are provided on both sides of the acid mist pipeline (44).

6. The equipment for preparing flexible graphite sheets according to claim 5, characterized in that, A cover plate (13) is fixedly installed inside the tank body (1). The openings of the multiple processing tanks (16) are open and abut against the cover plate (13). The cover plate (13) has multiple openings (14) on its circumference corresponding to a pair of loading positions (45), a pair of acid treatment positions (46) and a pair of water washing unloading positions (47). The outlet of the pretreatment channel (12) corresponds to the opening (14) at the loading position (45). Multiple liquid inlet stirring mechanisms correspond to the openings (14) at the pair of acid treatment positions (46) and the pair of water washing unloading positions (47).

7. The equipment for preparing flexible graphite sheets according to claim 6, characterized in that, The liquid inlet stirring mechanism includes a hydraulic cylinder (3) fixedly installed on the top of the tank (1). The telescopic end of the hydraulic cylinder (3) extends into the tank (1) and is fixed with a hanging plate (34). A liquid inlet pipe (38) is rotatably connected to the hanging plate (34). Multiple stirring pipes (39) are connected to the liquid inlet pipe (38). The upper end of the liquid inlet pipe (38) is connected to a connecting pipe (37) through a rotary joint. A first motor (35) is installed on the hanging plate (34). The output end of the first motor (35) is connected to the liquid inlet pipe (38) through a pair of transmission gears (36). The size of the hanging plate (34) is adapted to the opening (14).

8. The equipment for preparing flexible graphite sheets according to claim 7, characterized in that, A drive box (19) is fixedly installed on the side wall of the tank (1). A second motor (18) is installed on the top of the drive box (19). The output end of the second motor (18) extends into the drive box (19) and is fixed with a drive gear (20). A gear ring (33) is embedded and fixed on the circumferential side wall of the annular plate (15). The drive gear (20) extends into the tank (1) and meshes with the gear ring (33).

9. The equipment for preparing flexible graphite sheets according to claim 8, characterized in that, An annular dispersion box (29) is fixedly installed at the bottom of the tank (1). An annular filter screen (28) is circumferentially fitted on the annular dispersion box (29). A rotating ring is rotatably connected to the inner wall of the annular dispersion box (29). Multiple L-shaped dispersion plates (32) rotating in the circumferential direction are fixed on the rotating ring. A docking mechanism for docking with the processing tank (16) is installed at the top of the annular dispersion box (29) corresponding to a pair of water washing discharge positions (47). A discharge port is provided on both sides of the annular filter screen (28). A discharge pipe (27) is connected to the discharge port. An opening and closing component is installed in the discharge port. The lower end of the drive shaft (4) extends into the annular dispersion box (29) and is fixed with a turntable (30). A magnetic ring (31) with mutual attraction is embedded in the circumferential side wall of the turntable (30) and the circumferential side wall of the rotating ring. The bottom of the L-shaped dispersion plate (32) is attached to the bottom of the annular dispersion box (29), and the side wall is attached to the annular filter screen (28).

10. The equipment for preparing flexible graphite sheets according to claim 9, characterized in that, The docking mechanism includes a second cylinder (26) installed on the top of the annular dispersion box (29). The telescopic end of the second cylinder (26) is fixedly connected to a connecting pipe (24) via a connecting plate. The bottom of the processing tank (16) is provided with a discharge pipe (17) adapted to the connecting pipe (24). A valve is installed inside the discharge pipe (17). The lower end of the connecting pipe (24) extends into the annular dispersion box (29). A discharge pipe (22) is connected to the side wall of the connecting pipe (24). A baffle is installed inside the connecting pipe (24). Atomizers (21) are installed on the side wall of the tank (1) at a pair of water washing discharge positions (47). A recovery pipe (23) is connected between the liquid inlet end of the atomizer (21) and the discharge pipe (22). A three-way valve (25) is installed at the connection between the discharge pipe (22) and the recovery pipe (23) and the connecting pipe (24). The mist outlet end of the atomizer (21) is connected to the acid mist pipeline (44) through a pipe.

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