Apparatus for preparing a layered porous electromagnetic shielding composite film and method of use

Abstract

The application belongs to the technical field of preparation devices of electromagnetic shielding composite films, in particular to a preparation device and a use method of a porous electromagnetic shielding composite film with a layered structure, comprising a centrifuge and a centrifuge tube, wherein the centrifuge is internally provided with the centrifuge tube; a water outlet pipe is slidably connected to the top of the centrifuge, one end of the centrifuge tube is provided with a drainage groove, and a filter screen is fixedly installed in the drainage groove; the application drains the flushed sewage through the drainage groove, starts an electric push rod at the same time, and moves the fixed plate driven by the electric push rod; since the fixed plate is closer to the drainage groove than the baffle, the baffle will not re-enter the drainage groove when the fixed plate moves with the fan blade, and the fixed plate will slide together with the sliding plate in the centrifuge tube, so that the sliding plate blocks the water flow from entering the cavity.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of preparation device of electromagnetic shielding composite film, in particular to the preparation device and use method of layered porous electromagnetic shielding composite film. BACKGROUND

[0002] The layered porous electromagnetic shielding composite film is used for shielding electromagnetic interference and reducing its harm to human body. Graphene is used in the preparation of the layered porous electromagnetic shielding composite film. Graphene is a perfect two-dimensional carbon material with a large aspect ratio and specific surface area, and has excellent electrical conductivity, so it is widely used in the preparation of dual-functional materials with excellent conductivity and electromagnetic shielding performance. The ultra-thin graphene film prepared by graphitizing graphene oxide film not only has excellent electromagnetic shielding effect, but also has high in-plane thermal performance of more than 1100 W·mK-1. The highly aligned reduced graphene oxide (RGO) / cellulose nanofiber film has good electromagnetic shielding performance.

[0003] The electromagnetic shielding composite film needs to use a centrifuge in the preparation process. The centrifuge is used to centrifuge the preliminarily obtained mixed solution, and then the centrifugation product is washed with deionized water for multiple cycles and separated again by the centrifuge until the pH value of the supernatant is neutral, so as to continue the preparation of the electromagnetic shielding composite film. The washing step of the traditional operation process needs to take out the centrifugation product from the centrifuge, so that the centrifugation product is easily contaminated during the operation process. Moreover, the complex operation steps also need multiple devices to work together, which greatly reduces the work efficiency.

[0004] Therefore, the present application provides a preparation device and use method of layered porous electromagnetic shielding composite film. SUMMARY

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem proposed in the background art.

[0006] The technical solution adopted by the present invention to solve its technical problems is: the preparation device of the layered porous electromagnetic shielding composite film of the present invention comprises a centrifuge and a centrifuge tube, the centrifuge is installed inside the centrifuge; the top of the centrifuge is slidably connected to a water outlet pipe, one end of the centrifuge tube is provided with a drainage groove, the interior of the drainage groove is fixedly provided with a filter screen, one side of the centrifuge is fixedly provided with a connecting pipe, one end of the connecting pipe is communicated with the drainage groove, the interior of the centrifuge tube is provided with a cavity, the interior of the cavity is fixedly provided with an electric push rod, the output end of the electric push rod is fixedly provided with a baffle and a fixed plate, a through groove is provided between the cavity and the drainage groove, the fixed plate is in the centrifuge tube, the surface of the fixed plate is fixedly provided with a sliding plate, the surface of the sliding plate is slidably connected to the centrifuge tube, and the bottom of the fixed plate is connected with fan blades through a servo motor; the electromagnetic shielding composite film is prepared A centrifuge is required in the preparation process. The initially obtained mixed solution is centrifuged by the centrifuge, and the centrifuged product is then washed with deionized water for multiple cycles and separated again by the centrifuge until the pH value of the supernatant is neutral before continuing to prepare the electromagnetic shielding composite film. The cleaning step of this traditional operation process requires the centrifuged product to be taken out of the centrifuge, which makes the centrifuged product extremely susceptible to contamination during operation. In addition, the operation steps are complicated and require multiple devices to work together, which greatly reduces the work efficiency. When the present invention is working, after the mixed solution is centrifuged and the centrifuge is generated, the electric push rod in the cavity is started, and the electric push rod is allowed to slide into the cavity with the baffle, thereby opening the drainage trough and discharging the centrifuged liquid through the drainage trough. At the same time, the filter screen will block the centrifuge to prevent the centrifuge from being lost. After the sewage is discharged, the baffle enters the drainage trough again, thereby closing the drainage trough. At this time, the outlet pipe on the top of the centrifuge is slid so that the outlet pipe is above the centrifuge tube and water is sprayed to rinse the centrifuge. When the rinsing is completed, the baffle is slid again to discharge the rinsed sewage through the drain trough. The electric push rod is started while the sewage is being discharged. When the electric push rod drives the fixed plate to move, since the fixed plate is closer to the drain trough than the baffle, the baffle will not re-enter the drain trough when the fixed plate moves with the fan blades. When the fixed plate slides, it will drive the sliding plate in the centrifuge tube to slide together, so that the sliding plate can prevent water from entering the cavity. At the same time, the servo motor in the fixed plate drives the fan blades to block, so that the fan blades stir the water in the centrifuge tube, thereby assisting in cleaning the centrifuge. At the same time, the rotating fan blades can also play a role in turning away the centrifuge near the filter, reducing the accumulation of centrifuge near the filter, which leads to filter clogging and reduced drainage efficiency. With this structure, there is no need to take out the centrifuged product for rinsing, which greatly reduces the risk of contamination during the transportation of the centrifuge and greatly improves the efficiency of cleaning the centrifuge.

[0007] Preferably, an arc-shaped impact plate is fixedly mounted on the surface of the fan blade, and a brush is fixedly mounted on the surface of the impact plate; during operation, when the fan blade starts to rotate, it drives the impact plate to rotate together and impact the filter screen, causing the filter screen to vibrate, thereby shaking out or loosening the granular centrifugal matter on the surface of the filter screen, thereby preventing the centrifugal matter from being stuck in the gaps of the filter screen, and at the same time cooperating with the brush on the impact plate to sweep the loosened granular centrifugal matter back into the centrifuge tube, thereby reducing the loss of the centrifugal matter while clearing it through the filter screen.

[0008] Preferably, a sleeve plate of magnetic material is fixedly mounted on the end of the impact plate away from the fan blade, and a rotating plate of magnetic material and tilted is rotatably connected to the inside of the drainage trough through a torsion spring, a circular groove is provided on the surface of the rotating plate that passes through the rotating plate, and an impact rod with a conical cross-section is fixedly mounted on the side of the rotating plate close to the filter screen; when working, since a sleeve plate is installed on one end of the impact plate, the impact plate will drive the sleeve plate together when rotating toward the filter screen, and the magnetic sleeve plate will attract the rotating plate inside the drainage trough, so that the rotating plate rotates in the direction of the filter screen, and the conical impact rod on the rotating plate will be inserted into the hole of the filter screen, thereby knocking the centrifugal matter in the hole of the filter screen back into the centrifuge tube, avoiding the situation where the centrifugal matter is difficult to fall back into the centrifuge tube due to the pressure generated when the water flow passes through the filter screen.

[0009] Preferably, a hollow elastic block is fixedly installed inside the drainage trough, a shrinkage hole is opened on the surface of the elastic block, a waterproof and breathable membrane is fixedly installed in the shrinkage hole of the elastic block, and the bottom surface of the elastic block is in contact with the rotating plate; during operation, after the drainage is completed in the drainage trough and the rotating plate is reset, the elastic block will be squeezed so that the gas in the elastic block is discharged through the shrinkage hole, thereby assisting in blowing the centrifugal matter in the filter mesh. Since a waterproof and breathable membrane is installed in the shrinkage hole of the elastic block, when the elastic block is working in water, water flow still cannot enter the elastic block through the shrinkage hole, thereby ensuring that the elastic block can work stably for a long time.

[0010] Preferably, the interior of the centrifuge tube is rotatably connected to a bottom plate via a torsion spring, and a magnetic block is fixedly installed on one end of the bottom plate close to the fan blade; during operation, when the electric push rod moves up and down with the fixed plate, it will drive the sleeve plate to move together, so that the sleeve plate is close to the magnetic block. When the sleeve plate rises, it will drive the magnetic block and the bottom plate to rotate, so that the centrifuge on the bottom plate rotates accordingly. When the magnetic block and the sleeve plate are separated, the bottom plate will reset and vibrate under the action of the torsion spring. The vibration of the bottom plate will shake up the centrifuge on the surface, causing the centrifuge to displace, so that the centrifuge will not always be in contact with the bottom plate with one surface, so that the water sprayed from the outlet pipe can flush more centrifuge, avoiding the situation where the outlet pipe always flushes the centrifuge in the same place, thereby resulting in low flushing efficiency.

[0011] Preferably, a rectangular groove running through the bottom of the bottom plate is provided, a first elastic membrane is fixedly installed on the top of the rectangular groove, a connecting rod is fixedly installed on the bottom of the inner wall of the centrifuge tube, an arc-shaped top plate is fixedly installed on the top of the connecting rod, and the top plate and the connecting rod are located in the rectangular groove; during operation, when the bottom plate rotates and resets under the action of the torsion spring, the connecting rod and the top plate at the bottom of the centrifuge tube will enter the rectangular groove, allowing the arc-shaped top plate to lift up the first elastic membrane at the top of the rectangular groove, so that the centrifuge on the top of the first elastic membrane is lifted up, thereby preventing the centrifuge from always being in contact with the surface of the bottom plate, thereby facilitating the flushing of the centrifuge by water flow and accelerating the flushing rate of the centrifuge by water.

[0012] Preferably, a connecting cloth is fixedly installed on the side wall of the bottom plate, and the side wall of the connecting plate is fixedly connected to the inner wall of the centrifuge tube; during operation, by installing the connecting cloth, the connecting cloth will cooperate with the rotation of the bottom plate, so that when the bottom plate rotates, the connecting cloth can still play the role of sealing the gap between the bottom plate and the centrifuge tube, reducing the occurrence of water flow and centrifugal matter falling through the gap to the bottom of the bottom plate, thereby greatly reducing the residue of water flow and centrifugal matter.

[0013] Preferably, a placement groove is provided on the top of the bottom plate, and a second elastic membrane is fixedly installed on the top of the placement groove, and a rotating rod is rotatably connected to the inside of the placement groove, and one end of the rotating rod is in the rectangular groove, and a plurality of protrusions and protruding balls are fixedly installed on the surface of the rotating rod, and an arc-shaped curved plate is fixedly installed on the top of the top plate, and a plurality of grooves are provided on the top of the curved plate; during operation, when the top plate is reset to the rectangular groove, the curved plate of the top plate will be driven to reset together, accommodating the contact between the curved plate and the protruding balls of the rotating rod. Since the curved plate continues to move, the grooves on the surface of the curved plate will cooperate with the protruding balls to drive the rotating rod to rotate, and the rotation of the rotating rod will drive the protrusions in the placement groove to rotate together, so that the protrusions squeeze and lift the second elastic membrane, so that the centrifugal matter on the surface of the second elastic membrane is quickly lifted up and flies, further improving the flushing efficiency.

[0014] Preferably, the interior of the through groove is rotatably connected to several symmetrically designed sealing plates through a torsion spring, and the sealing plates are inclined; during operation, when the baffle is not in the drainage groove, the sealing plate will reset under the action of the torsion spring, thereby closing the through groove and forming an inclined shape. The closed sealing plate can effectively block water from entering the through groove and the cavity, which is beneficial to protecting the electric push rod in the cavity. When the electric push rod slides toward the drainage groove with the baffle, the baffle will contact the inclined sealing plate. The inclined sealing plate facilitates the baffle to push the rotation and rotate and shrink toward the centrifuge tube, thereby facilitating the sliding of the baffle into the drainage groove, and the sealing plate will always fit with the baffle under the action of the torsion spring, thereby ensuring the airtightness of the baffle and the through groove, thereby reducing the flow of water into the cavity.

[0015] A method for using a porous electromagnetic shielding composite film, which is applicable to a device for preparing the porous electromagnetic shielding composite film with the layered structure, comprises the following steps:

[0016] S1: Add graphite powder and NaNO3 spoonful by spoonful to concentrated H2SO4 in an ice bath with vigorous stirring. Keep the temperature of the concentrated H2SO4 below 4°C throughout the process. Then, add KMnO4 within 30 minutes and perform oxidation at 4°C or below for more than 4 hours. Pour the reaction mixture into 1000 mL of deionized water at 4°C or below, and slowly add 30 mL of H2O2 to terminate the reaction to obtain a mixed solution.

[0017] S2: The obtained mixed solution is placed in a centrifuge for centrifugation. The centrifuged product is washed with deionized water for multiple cycles and separated by centrifugation until the pH value of the supernatant is neutral. The obtained viscous solid is redispersed in deionized water and ultrasonically treated at room temperature for 10-15 minutes to further exfoliate the graphite sheets and further remove impurities, thereby obtaining a brown viscous GO diluted dispersion.

[0018] S3: The diluted GO dispersion is subjected to three further centrifugal separation treatments to remove unoxidized graphite powder and unexfoliated graphite oxide agglomerates, and the diluted GO dispersion is concentrated by centrifugation at 1000 rpm for 1 hour to obtain a GO slurry with a solid content of up to 1 wt.%, thereby improving the GO slurry to produce the desired layered porous electromagnetic shielding composite film.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention provides a preparation device and a method for using a porous electromagnetic shielding composite film with a layered structure. The water outlet pipe on the top of the centrifuge is slid so that the water outlet pipe is above the centrifuge tube and water is sprayed to rinse the centrifuge. After the rinsing is completed, the baffle is slid again to discharge the washed sewage through the drainage trough. While the sewage is being discharged, the electric push rod is started. When the electric push rod drives the fixed plate to move, the fixed plate will drive the sliding plate in the centrifuge tube to slide together, so that the sliding plate can prevent water from entering the cavity. At the same time, the servo motor in the fixed plate drives the fan blades to block, so that the fan blades stir the water in the centrifuge tube, thereby assisting in cleaning the centrifuge. At the same time, the rotating fan blades can also drive away the centrifuge near the filter screen, reducing the accumulation of centrifuge near the filter screen, which leads to filter screen clogging and reduced drainage efficiency. With this structure, there is no need to take out the centrifuged product for rinsing, which greatly reduces the risk of contamination during the transportation of the centrifuge and greatly improves the efficiency of cleaning the centrifuge.

[0021] 2. The present invention provides a preparation device and a method for using a porous electromagnetic shielding composite film with a layered structure. When the fan blades start to rotate, the impact plate will be driven to rotate together and hit the filter screen, causing the filter screen to vibrate, thereby shaking out or loosening the granular centrifugal matter on the surface of the filter screen, thereby preventing the centrifugal matter from getting stuck in the gaps of the filter screen. At the same time, the brush on the impact plate will sweep the loosened granular centrifugal matter back into the centrifuge tube, which can reduce the loss of centrifugal matter while passing through the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the centrifuge in the present invention;

[0025] Figure 2 It is a partial structural schematic diagram of the centrifuge tube in the present invention;

[0026] Figure 3 Schematic diagram of the cross-sectional structure of the bottom plate of the present invention;

[0027] Figure 4 This is the Figure 3 Schematic diagram of the structure at A;

[0028] Figure 5 This is the Figure 4 Schematic diagram of the structure at B;

[0029] Figure 6 It is a schematic structural diagram of the second elastic membrane in the present invention;

[0030] Figure 7 It is a schematic structural diagram of the first elastic membrane in the present invention;

[0031] Figure 8 It is a structural diagram of the top plate of this invention;

[0032] Figure 9 This is the Figure 8 Schematic diagram of the structure at C;

[0033] Figure 10 It is a structural diagram of the curved plate in this invention;

[0034] Figure 11This is a schematic flow chart of the method for using the porous electromagnetic shielding composite film of the present invention;

[0035] Figure 12 It is a structural diagram of the baffle in the second embodiment.

[0036] In the figure: 1. centrifuge; 2. centrifuge tube; 3. water outlet pipe; 4. cavity; 5. electric push rod; 6. drainage trough; 7. through groove; 8. baffle; 9. connecting pipe; 10. fixed plate; 11. sliding plate; 12. fan blade; 13. filter screen; 14. impact plate; 15. sleeve plate; 16. rotating plate; 17. impact rod; 18. elastic block; 19. bottom plate; 20. magnetic block; 21. rectangular groove; 22. connecting rod; 23. top plate; 24. first elastic membrane; 25. connecting cloth; 26. placement groove; 27. rotating rod; 28. convex ball; 29. ​​arc plate; 30. groove; 31. convex block; 32. second elastic membrane; 33. sealing plate. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Example 1:

[0039] See also Figures 1-11As shown, the preparation device of the layered porous electromagnetic shielding composite film described in the embodiment of the present invention includes a centrifuge 1 and a centrifuge tube 2, and the centrifuge 1 is equipped with a centrifuge tube 2; the top of the centrifuge 1 is slidably connected to a water outlet pipe 3, one end of the centrifuge tube 2 is provided with a drainage groove 6, and the interior of the drainage groove 6 is fixedly installed with a filter screen 13, and one side of the centrifuge 1 is fixedly installed with a connecting pipe 9, one end of the connecting pipe 9 is communicated with the drainage groove 6, a cavity 4 is provided inside the centrifuge tube 2, an electric push rod 5 is fixedly installed inside the cavity 4, and a baffle 8 and a fixed plate 10 are fixedly installed on the output end of the electric push rod 5, a through groove 7 is provided between the cavity 4 and the drainage groove 6, the fixed plate 10 is in the centrifuge tube 2, and a sliding plate 11 is fixedly installed on the surface of the fixed plate 10, the surface of the sliding plate 11 is slidably connected to the centrifuge tube 2, and the bottom of the fixed plate 10 is connected to the fan blade 12 through a servo motor; electromagnetic shielding composite film A centrifuge 1 is required in the preparation process of the composite film. The initially obtained mixed solution is centrifuged by the centrifuge 1, and the centrifuged product is then washed with deionized water for multiple cycles and separated again by the centrifuge 1 until the pH value of the supernatant is neutral before the preparation of the electromagnetic shielding composite film can continue. The cleaning step of this traditional operation process requires the centrifuged product to be taken out of the centrifuge 1, which makes the centrifuged product extremely susceptible to contamination during operation. In addition, the operation steps are complicated and multiple devices need to work together, which greatly reduces the work efficiency. When the present invention is working, after the mixed solution is centrifuged and the centrifuge is generated, the electric push rod 5 in the cavity 4 is started, and the electric push rod 5 slides with the baffle 8 into the cavity 4, thereby opening the drainage trough 6 and discharging the centrifuged liquid through the drainage trough 6. At the same time, the filter screen 13 will block the centrifuge to prevent the centrifuge from being lost. After the sewage is discharged, the baffle 8 enters the drainage trough 6 again, thereby closing the drainage trough 6.At this time, the outlet pipe 3 on the top of the slide centrifuge 1 is placed above the centrifuge tube 2 and water is sprayed to rinse the centrifuge. When the rinsing is completed, the baffle 8 is slid again to discharge the washed sewage through the drain trough 6. The electric push rod 5 is started while the sewage is being discharged. When the electric push rod 5 drives the fixed plate 10 to move, since the fixed plate 10 is closer to the drain trough 6 than the baffle 8, the baffle 8 will not re-enter the drain trough 6 when the fixed plate 10 moves with the fan blades 12, and the fixed plate 10 will drive the sliding plate 11 in the centrifuge tube 2 to slide together when sliding, so that the sliding plate 11 can block the water. The situation that the flow enters the cavity 4 occurs, and the servo motor in the fixed plate 10 (not shown in the figure) drives the fan blades 12 to block it, so that the fan blades 12 stir the water in the centrifuge tube 2, thereby playing a role in assisting the cleaning of the centrifuge. At the same time, the rotating fan blades 12 can also play a role in turning away the centrifuge near the filter screen 13, reducing the accumulation of centrifuge near the filter screen 13, which leads to clogging of the filter screen 13 and decreased drainage efficiency. Through the arrangement of this structure, there is no need to take out the product after centrifugation and then rinse it, which greatly reduces the risk of contamination when transporting the centrifuge, and greatly improves the work efficiency of cleaning the centrifuge.

[0040] An arc-shaped impact plate 14 is fixedly mounted on the surface of the fan blade 12, and a brush is fixedly mounted on the surface of the impact plate 14. During operation, when the fan blade 12 starts to rotate, the impact plate 14 is driven to rotate together and impact the filter screen 13, causing the filter screen 13 to vibrate, thereby shaking out or loosening the granular centrifugal matter on the surface of the filter screen 13, thereby preventing the centrifugal matter from being stuck in the gap of the filter screen 13. At the same time, the brush on the impact plate 14 (not shown in the figure) is used to sweep the loosened granular centrifugal matter back into the centrifuge tube 2, thereby reducing the loss of the centrifugal matter while passing through the filter screen 13.

[0041] The end of the impact plate 14 away from the fan blade 12 is fixedly mounted with a sleeve 15 of magnetic material, and the interior of the drainage groove 6 is rotatably connected to a rotating plate 16 of magnetic material and inclined by a torsion spring. The surface of the rotating plate 16 is provided with a circular groove running through itself, and the rotating plate 16 is fixedly mounted with a striker 17 with a conical cross-section on the side close to the filter screen 13. During operation, since the sleeve 15 is installed at one end of the impact plate 14, the impact plate 14 will drive the sleeve 15 together when it rotates toward the filter screen 13. The sleeve 15 of the magnetic material will attract the rotating plate 16 inside the drainage groove 6, causing the rotating plate 16 to rotate in the direction of the filter screen 13. The conical striker 17 on the rotating plate 16 will be inserted into the hole of the filter screen 13, thereby knocking the centrifugal matter in the hole of the filter screen 13 back into the centrifuge tube 2, avoiding the situation where the centrifugal matter is difficult to fall into the centrifuge tube 2 again due to the pressure generated when the water flow passes through the filter screen 13.

[0042] A hollow elastic block 18 is fixedly installed inside the drainage trough 6, and a shrinkage hole is opened on the surface of the elastic block 18. A waterproof breathable membrane is fixedly installed in the shrinkage hole of the elastic block 18, and the bottom surface of the elastic block 18 is in contact with the rotating plate 16. During operation, after the drainage is completed in the drainage trough 6 and the rotating plate 16 is reset, the elastic block 18 is squeezed, so that the gas in the elastic block 18 is discharged through the shrinkage hole, thereby assisting in blowing the centrifugal matter in the holes of the filter screen 13. Since a waterproof breathable membrane is installed in the shrinkage hole of the elastic block 18, when the elastic block 18 is working in water, water cannot enter the elastic block 18 through the shrinkage hole, thereby ensuring that the elastic block 18 can work stably for a long time.

[0043] The interior of the centrifuge tube 2 is rotatably connected to a bottom plate 19 by a torsion spring, and a magnetic block 20 is fixedly installed on one end of the bottom plate 19 near the fan blade 12; during operation, when the electric push rod 5 moves up and down with the fixed plate 10, it will drive the sleeve plate 15 to move together, so that the sleeve plate 15 is close to the magnetic block 20. When the sleeve plate 15 rises, it will drive the magnetic block 20 and the bottom plate 19 to rotate, so that the centrifugal matter on the bottom plate 19 rotates accordingly. When the magnetic block 20 and the sleeve plate 15 are separated, the bottom plate 19 will be reset and vibrated under the action of the torsion spring. The vibration of the bottom plate 19 will shake up the centrifugal matter on the surface, causing the centrifugal matter to be displaced, so that the centrifugal matter will not always be in contact with the bottom plate 19 with one surface, thereby allowing the water sprayed from the water outlet pipe 3 to flush more centrifugal matter, avoiding the water outlet pipe 3 always flushing the centrifugal matter in the same place, thereby resulting in low flushing efficiency.

[0044] A rectangular groove 21 is formed at the bottom of the bottom plate 19, which passes through the bottom plate 19. A first elastic membrane 24 is fixedly mounted on the top of the rectangular groove 21. A connecting rod 22 is fixedly mounted on the bottom of the inner wall of the centrifuge tube 2. An arc-shaped top plate 23 is fixedly mounted on the top of the connecting rod 22. The top plate 23 and the connecting rod 22 are located in the rectangular groove 21. During operation, when the bottom plate 19 rotates and resets under the action of the torsion spring, the connecting rod 22 and the top plate 23 at the bottom of the centrifuge tube 2 enter the rectangular groove 21, allowing the arc-shaped top plate 23 to lift the first elastic membrane 24 at the top of the rectangular groove 21, so that the centrifuge on the top of the first elastic membrane 24 is lifted, thereby preventing the centrifuge from always being in contact with the surface of the bottom plate 19, thereby facilitating the flushing of the centrifuge by water and accelerating the flushing rate of the centrifuge by water.

[0045] The side wall of the bottom plate 19 is fixedly provided with a connecting cloth 25, and the side wall of the connecting plate is fixedly connected with the inner wall of the centrifugal tube 2; during operation, the connecting cloth 25 is installed to cooperate with the rotation of the bottom plate 19, so that the connecting cloth 25 can still play a role in sealing the gap between the bottom plate 19 and the centrifugal tube 2 during the rotation of the bottom plate 19, thereby reducing the occurrence of the water flow and the centrifugation falling through the gap to the lower side of the bottom plate 19, and greatly reducing the residue of the water flow and the centrifugation.

[0046] The top of the bottom plate 19 is provided with a placing groove 26, the top of the placing groove 26 is fixedly provided with a second elastic film 32, the inside of the placing groove 26 is rotatably connected with a rotating rod 27, one end of the rotating rod 27 is located in the rectangular groove 21, the surface of the rotating rod 27 is fixedly provided with a plurality of protrusions 31 and a convex ball 28, the top of the top plate 23 is fixedly provided with an arc-shaped arc plate 29, and the top of the arc plate 29 is provided with a plurality of recesses 30; during operation, when the top plate 23 resets into the rectangular groove 21, the arc plate 29 of the top plate 23 is reset together, the arc plate 29 and the convex ball 28 of the rotating rod 27 are in contact, because the arc plate 29 is still moving, the recesses 30 on the surface of the arc plate 29 cooperate with the convex ball 28 to drive the rotating rod 27 to rotate, the rotation of the rotating rod 27 drives the protrusions 31 in the placing groove 26 to rotate together, the protrusions 31 press and lift the second elastic film 32, the centrifugation on the surface of the second elastic film 32 is quickly lifted to fly, and the flushing efficiency is further improved.

[0047] Method for using the porous electromagnetic shielding composite film, the method is suitable for the preparation device of the layered porous electromagnetic shielding composite film, and the method comprises the following steps:

[0048] S1: graphite powder and NaNO3 are added to concentrated H2SO4 in an ice bath, and stirred vigorously, and the temperature of the concentrated H2SO4 is kept below 4℃ throughout the process; then KMnO4 is added within 30 minutes, and oxidation is carried out at 4℃ or below for more than 4 hours, the reaction mixture is poured into 1000ml deionized water at 4℃ or below, and 30ml H2O2 is slowly added to terminate the reaction to obtain a mixed solution;

[0049] S2: the obtained mixed solution is placed in a centrifuge 1 for centrifugation, and the centrifugation product is washed with deionized water for multiple cycles, and separated by centrifugation until the pH value of the supernatant is neutral, and the obtained viscous solid is dispersed in deionized water again, and ultrasonic treatment is carried out at room temperature for 10-15 minutes to further exfoliate the graphite layers and further remove impurities, to obtain a brown viscous GO dilute dispersion;

[0050] S3: The GO dilute dispersion liquid is further centrifuged three times to remove unoxidized graphite powder and unpeeled graphite oxide agglomerates, and the GO dilute dispersion liquid is concentrated by centrifugation at 1000 rpm for 1 h to obtain a GO slurry with a solid content of up to 1 wt.%, which improves the production of the layered structure of the porous electromagnetic shielding composite film.

[0051] Example Two:

[0052] As Figure 12 shown, Comparative Example One, wherein another embodiment of the present invention is:

[0053] The inside of the through groove 7 is connected with several symmetrical sealing plates 33 by torsion spring rotation, the sealing plates 33 are inclined; when the baffle 8 is not in the drainage groove 6, the sealing plates 33 will reset under the action of the torsion spring, thereby closing the through groove 7 and forming an inclined shape, the closed sealing plates 33 can effectively block the water flow into the through groove 7 and the cavity 4, thereby facilitating the protection of the electric push rod 5 in the cavity 4; when the electric push rod 5 slides with the baffle 8 to the direction of the drainage groove 6, the baffle 8 will contact the inclined sealing plates 33, the inclined sealing plates 33 facilitate the rotation and contraction of the baffle 8 into the centrifugal tube 2, thereby facilitating the sliding of the baffle 8 in the drainage groove 6, and the sealing plates 33 will always be attached to the baffle 8 under the action of the torsion spring, thereby ensuring the airtightness of the baffle 8 and the through groove 7, thereby reducing the water flow into the cavity 4.

[0054] Working principle: when the mixed solution is completed and the centrifugation is generated, the electric push rod 5 in the cavity 4 is started to slide the baffle 8 into the cavity 4, so as to open the drain groove 6, and the liquid after centrifugation is discharged through the drain groove 6, and the filter screen 13 blocks the centrifugation to prevent the loss of centrifugation. When the sewage is completed, the baffle 8 enters the drain groove 6 again, and then the drain groove 6 is closed. At this time, the water outlet pipe 3 at the top of the sliding centrifuge 1 is slid, so that the water outlet pipe 3 is above the centrifugal tube 2 and sprays water to wash the centrifugation. When the washing is completed, the baffle 8 is slid again, and the sewage after washing is discharged through the drain groove 6. At the same time, the electric push rod 5 is started. When the electric push rod 5 drives the fixed plate 10 to move, because the fixed plate 10 is closer to the drain groove 6 than the baffle 8, when the fixed plate 10 moves with the fan blade 12, the baffle 8 will not re-enter the drain groove 6, and the fixed plate 10 will slide with the sliding plate 11 in the centrifugal tube 2, so that the sliding plate 11 blocks the water flow into the cavity 4. At the same time, the servo motor in the fixed plate 10 (not shown in the figure) drives the fan blade 12 to block, so that the fan blade 12 stirs the water in the centrifugal tube 2, thereby playing the role of auxiliary cleaning of the centrifugation. At the same time, the rotating fan blade 12 can also turn off the centrifugation near the filter screen 13, reduce the accumulation of centrifugation near the filter screen 13, thereby causing the filter screen 13 to be blocked and the drainage efficiency to be reduced. Through the structure, the product after centrifugation does not need to be taken out for washing, which greatly reduces the risk of pollution during the transportation of the centrifugation, and greatly improves the working efficiency of cleaning the centrifugation. When the fan blade 12 starts to rotate, it will drive the impact plate 14 to rotate and hit the filter screen 13, so that the filter screen 13 vibrates, thereby shaking off or loosening the granular centrifugation on the surface of the filter screen 13, thereby preventing the centrifugation from being stuck in the gap of the filter screen 13. At the same time, the brush (not shown in the figure) on the impact plate 14 can sweep the loosened granular centrifugation back into the centrifugal tube 2, thereby reducing the loss of centrifugation while loosening the filter screen 13. Because one end of the impact plate 14 is provided with a sleeve plate 15, the impact plate 14 will drive the sleeve plate 15 to rotate towards the filter screen 13. The sleeve plate 15 of magnetic material will attract the rotating plate 16 inside the drain groove 6, so that the rotating plate 16 rotates in the direction of the filter screen 13. The conical impact rod 17 on the rotating plate 16 will be inserted into the hole of the filter screen 13, so as to hit the centrifugation in the hole of the filter screen 13 back into the centrifugal tube 2, thereby avoiding the pressure generated by the water flow through the filter screen 13, thereby preventing the centrifugation from falling back into the centrifugal tube 2.After the drainage is completed in the drainage groove 6, the rotating plate 16 will squeeze the elastic block 18 when it is reset, so that the gas in the elastic block 18 is discharged through the shrinkage hole, thereby assisting in blowing the centrifugal matter in the holes of the filter screen 13. Since a waterproof and breathable membrane is installed in the shrinkage hole of the elastic block 18, when the elastic block 18 is working in water, water cannot enter the elastic block 18 through the shrinkage hole, thereby ensuring that the elastic block 18 can work stably for a long time.

[0055] When the electric push rod 5 moves up and down with the fixed plate 10, it will drive the sleeve plate 15 to move together, so that the sleeve plate 15 is close to the magnetic block 20. When the sleeve plate 15 rises, it will drive the magnetic block 20 and the bottom plate 19 to rotate, so that the centrifugal matter on the bottom plate 19 rotates accordingly. When the magnetic block 20 and the sleeve plate 15 are separated, the bottom plate 19 will reset and vibrate under the action of the torsion spring. The vibration of the bottom plate 19 will shake up the centrifugal matter on the surface, causing the centrifugal matter to shift, so that the centrifugal matter will not always be in contact with the bottom plate 19 with one surface, so that the water sprayed from the water outlet pipe 3 can flush more centrifugal matter, avoiding the water outlet pipe 3 always flushing the centrifugal matter in the same place, which leads to low flushing efficiency. When the bottom plate 19 rotates and resets under the force of the torsion spring, the connecting rod 22 and top plate 23 at the bottom of the centrifuge tube 2 enter the rectangular groove 21, allowing the curved top plate 23 to lift the first elastic membrane 24 at the top of the rectangular groove 21, so that the centrifuge on top of the first elastic membrane 24 is lifted, thereby preventing the centrifuge from always contacting the surface of the bottom plate 19, thereby facilitating the flushing of the centrifuge by the water flow and accelerating the flushing rate of the centrifuge. By installing the connecting cloth 25, the connecting cloth 25 will cooperate with the rotation of the bottom plate 19, so that when the bottom plate 19 rotates, the connecting cloth 25 can still play the role of sealing the gap between the bottom plate 19 and the centrifuge tube 2, reducing the occurrence of water and centrifuge falling through the gap to the bottom of the bottom plate 19, thereby greatly reducing the residual water and centrifuge. When the top plate 23 is reset into the rectangular groove 21, the curved plate 29 of the top plate 23 is driven to reset together, and the curved plate 29 is accommodated in contact with the convex ball 28 of the rotating rod 27. Since the curved plate 29 is still moving, the groove 30 on the surface of the curved plate 29 cooperates with the convex ball 28 to drive the rotating rod 27 to rotate. The rotation of the rotating rod 27 drives the protrusion 31 in the placement groove 26 to rotate together, allowing the protrusion 31 to squeeze and lift the second elastic membrane 32, so that the centrifugal matter on the surface of the second elastic membrane 32 is quickly lifted up and flies, further improving the flushing efficiency.

[0056] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing a porous electromagnetic shielding composite film with a layered structure, comprising a centrifuge (1) and a centrifuge tube (2), wherein the centrifuge tube (2) is installed inside the centrifuge (1); characterized in that: The top of the centrifuge (1) is slidably connected to a water outlet pipe (3), one end of the centrifuge tube (2) is provided with a drainage groove (6), a filter screen (13) is fixedly installed inside the drainage groove (6), a connecting pipe (9) is fixedly installed on one side of the centrifuge (1), one end of the connecting pipe (9) is communicated with the drainage groove (6), a cavity (4) is provided inside the centrifuge tube (2), an electric push rod (5) is fixedly installed inside the cavity (4), a baffle (8) and a fixed plate (10) are fixedly installed at the output end of the electric push rod (5), a through groove (7) is provided between the cavity (4) and the drainage groove (6), the fixed plate (10) is located in the centrifuge tube (2), a sliding plate (11) is fixedly installed on the surface of the fixed plate (10), the surface of the sliding plate (11) is slidably connected to the centrifuge tube (2), and the bottom of the fixed plate (10) is connected to a fan blade (12) via a servo motor; The interior of the centrifuge tube (2) is rotatably connected to a bottom plate (19) via a torsion spring, and a magnetic block (20) is fixedly mounted on one end of the bottom plate (19) close to the fan blade (12); The bottom of the bottom plate (19) is provided with a rectangular groove (21) running through the bottom plate, a first elastic membrane (24) is fixedly mounted on the top of the rectangular groove (21), a connecting rod (22) is fixedly mounted on the bottom of the inner wall of the centrifuge tube (2), an arc-shaped top plate (23) is fixedly mounted on the top of the connecting rod (22), and the top plate (23) and the connecting rod (22) are located in the rectangular groove (21); A placement groove (26) is provided on the top of the bottom plate (19), a second elastic membrane (32) is fixedly installed on the top of the placement groove (26), a rotating rod (27) is rotatably connected inside the placement groove (26), one end of the rotating rod (27) is located in the rectangular groove (21), a plurality of protrusions (31) and convex balls (28) are fixedly installed on the surface of the rotating rod (27), an arc-shaped arc plate (29) is fixedly installed on the top of the top plate (23), and a plurality of grooves (30) are provided on the top of the arc plate (29).

2. The device for preparing a porous electromagnetic shielding composite film with a layered structure according to claim 1, characterized in that: An arc-shaped impact plate (14) is fixedly mounted on the surface of the fan blade (12), and a brush is fixedly mounted on the surface of the impact plate (14).

3. The device for preparing a porous electromagnetic shielding composite film with a layered structure according to claim 2, characterized in that: A sleeve plate (15) made of a magnetic material is fixedly mounted on one end of the impact plate (14) away from the fan blade (12); a rotating plate (16) made of a magnetic material and tilted is rotatably connected to the inside of the drainage groove (6) via a torsion spring; a circular groove is provided on the surface of the rotating plate (16) that passes through the rotating plate; and an impact rod (17) with a conical cross section is fixedly mounted on one side of the rotating plate (16) close to the filter screen (13).

4. The device for preparing a porous electromagnetic shielding composite film with a layered structure according to claim 1, characterized in that: A hollow elastic block (18) is fixedly installed inside the drainage trough (6), a shrinkage hole is opened on the surface of the elastic block (18), a waterproof breathable membrane is fixedly installed in the shrinkage hole of the elastic block (18), and the bottom surface of the elastic block (18) is in contact with the rotating plate (16).

5. The device for preparing and using the porous electromagnetic shielding composite film with a layered structure according to claim 4, characterized in that: A connecting cloth (25) is fixedly mounted on the side wall of the bottom plate (19), and the side wall of the connecting plate is fixedly connected to the inner wall of the centrifuge tube (2).

6. The device for preparing a porous electromagnetic shielding composite film with a layered structure according to claim 1, characterized in that: The interior of the through groove (7) is rotatably connected to a plurality of symmetrically designed sealing plates (33) via a torsion spring, and the sealing plates (33) are inclined.

7. A method for using a porous electromagnetic shielding composite film, the method being applicable to the apparatus for preparing the porous electromagnetic shielding composite film according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1: Add graphite powder and NaNO₃ spoonfuls by spoonfuls to concentrated H₂SO₄ in an ice bath with vigorous stirring. Maintain the temperature of the concentrated H₂SO₄ below 4°C throughout the process. Then, add KMnO₄ over 30 minutes and perform oxidation at or below 4°C for at least 4 hours. Pour the reaction mixture into 1000 mL of deionized water at or below 4°C, and slowly add 30 mL of H₂O₂ to terminate the reaction to obtain a mixed solution. S2: The obtained mixed solution is placed in a centrifuge (1) for centrifugation. The centrifuged product is washed with deionized water for multiple cycles and separated by centrifugation until the pH value of the supernatant is neutral. The obtained viscous solid is redispersed in deionized water and ultrasonically treated at room temperature for 10-15 minutes to further exfoliate the graphite sheets and further remove impurities, thereby obtaining a brown viscous GO diluted dispersion. S3: The diluted GO dispersion was centrifuged three times to remove unoxidized graphite powder and unexfoliated graphite oxide agglomerates. The diluted GO dispersion was concentrated by centrifugation at 1000 rpm for 1 h to obtain a GO slurry with a solid content of up to 1 wt.%, thereby improving the GO slurry to produce the required layered porous electromagnetic shielding composite film.

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