Preparation method of melamine foam wave-absorbing material

Abstract

The application discloses a preparation method of melamine bubble cotton foam wave-absorbing material, which comprises the following steps: placing melamine bubble cotton into a middle part, rotating an inward clamping plate to keep a negative pressure state in a suction assembly, and discharging air in the suction assembly; starting an immersion tank and a lifting platform, and increasing pressure through an air pump to uniformly immerse functional slurry into the melamine bubble cotton; rotating an outward clamping plate to make the melamine bubble cotton in a movable state; rotating the clamping plate outward to restore air pressure in the suction assembly, and adsorbing slurry in the melamine bubble cotton in contact with the suction assembly into the suction assembly. The preparation method of the melamine bubble cotton foam wave-absorbing material can keep a negative pressure state in the suction assembly when rotating the clamping plate inward to the inside of the lifting platform, and restore atmospheric pressure in the suction assembly when resetting the clamping plate, so that the slurry near the contact part of the suction assembly and the melamine bubble cotton is sucked into the suction assembly, and then is guided into the inside of the immersion tank through the suction assembly.

Description

Technical Field

[0001] This invention relates to the field of melamine foam production technology, and more specifically to a method for preparing melamine foam microwave absorbing material. Background Technology

[0002] Melamine foam is a flexible, open-cell foam made from melamine, a thermosetting resin plastic. It has a fine three-dimensional mesh structure, giving it excellent sound absorption and heat insulation properties. It is widely used in construction, industry, and vehicle manufacturing. During manufacturing, custom-made tooling is used to limit the movement of the melamine foam during impregnation to prevent damage.

[0003] According to patent application CN113444283A, published on September 28, 2021, a core-shell structured polystyrene foam microwave absorbing ball is disclosed. It includes an absorbing ball and a layer of microwave-absorbing and flame-retardant medium uniformly coated on its surface. The absorbing ball comprises microwave-absorbing sand obtained through co-foaming and polystyrene raw material particles. The microwave-absorbing and flame-retardant medium includes a solid dispersant, a conductive agent, and a flame retardant. Its main technical advantages are: the rigid polystyrene foam microwave absorbing ball exhibits a uniform core-shell structure, which is very beneficial for subsequent molding; the uniformly coated core-shell structure is more conducive to absorbing electromagnetic waves; and through the co-foaming process, the microwave-absorbing sand can be directly coated onto the pre-foamed particles during foaming, simplifying the process steps and significantly improving efficiency.

[0004] When using existing clamping fixtures for melamine foam impregnation, the contact area between the clamping fixture and the melamine foam is relatively large, and the slurry will remain on the clamping fixture. After vacuum impregnation is completed, when the impregnation tank returns to normal air pressure, the functional slurry used for impregnation will be reabsorbed into the melamine foam. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing melamine foam microwave absorbing material, which aims to solve the problem that after vacuum impregnation is completed, when the impregnation tank returns to normal air pressure, the functional slurry used for impregnation will be reabsorbed into the melamine foam.

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

[0007] A method for preparing a melamine foam microwave absorbing material includes the following steps:

[0008] S1: Place the melamine foam into an impregnation tank, and a lifting platform is slidably connected inside the impregnation tank; a suction component is provided on the lifting platform so that the four corners of the melamine foam contact the suction component, and the top surface of the melamine foam forms a concave mesh surface.

[0009] S2: Rotate the clamping plate on the lifting platform inward so that the contact airbag on the clamping plate comes into contact with the melamine foam, thus restricting the movement of the melamine foam.

[0010] S3: When the clamping plate rotates inward, it keeps the inside of the suction assembly under negative pressure, thus expelling the air from inside the suction assembly.

[0011] S4: Start the impregnation tank and lifting platform, and pressurize the pump to make the functional slurry evenly impregnate the melamine foam;

[0012] S5: Use an air pump to extract the air from the impregnation tank, so that the excess slurry inside the melamine foam can be discharged.

[0013] S6: Rotate the outer clamping plate to make the melamine foam in an active state;

[0014] S7: When the clamping plate rotates outward, the air pressure inside the suction assembly is restored, and the slurry in the melamine foam in contact with the suction assembly is absorbed into the suction assembly.

[0015] Preferably, one end of the suction component protrudes from the outer wall of one side of the lifting platform, and the end of the suction component protruding from the lifting platform contacts the melamine foam, so that the melamine foam is placed on the lifting platform.

[0016] Preferably, the suction assembly includes a sealing rubber part, which is disposed at one end of the suction assembly located outside the lifting platform, and the sealing rubber part is in contact with melamine foam.

[0017] Preferably, a slider is slidably provided on the lifting platform, the slider is connected to the sealing rubber part, and the slider is kept sliding by the inward rotation of the clamping plate in step S3, so as to open and close the sealing rubber part.

[0018] Preferably, a protrusion is provided on the outer wall of one side of the clamping plate, and a plurality of abutment portions are provided on the protrusion. The clamping plate abuts against the slider through the protrusion so that the slider keeps sliding.

[0019] Preferably, a reset unit is provided between the slider and the suction assembly. In step S8, the suction assembly is reset by the reset unit, and the reset unit pushes the slider away from the suction assembly to keep the sealing rubber part open.

[0020] Preferably, the suction assembly further includes a movable part, which is driven to remain movable so that the inside of the suction assembly is kept under negative pressure.

[0021] Preferably, a movable plate is slidably disposed inside the lifting platform, the movable plate is connected to the clamping plate, and the movable plate is driven by the clamping plate to slide inside the lifting platform.

[0022] Preferably, a pressure airbag is fixedly installed inside the lifting platform. The pressure airbag is abutted by the movable plate and expands outward, so that the pressure airbag abuts against the suction component, thereby maintaining negative pressure inside the suction component.

[0023] Preferably, in step S4, the slurry enters the lifting platform through a drainage channel provided on the lifting platform. The drainage channel is an elastic pipe that runs through the lifting platform, and the outer wall of the drainage channel is connected to the movable plate through a connecting belt. The movable plate slides and squeezes the outer wall of the drainage channel through the connecting belt, thereby reducing the inner diameter of the drainage channel.

[0024] The method for preparing melamine foam microwave absorbing material provided by the present invention, as described above, has the following beneficial effects:

[0025] In this invention, melamine foam is mounted on a lifting platform via a suction assembly, which reduces the contact area between the melamine foam and the lifting platform. This reduces the amount of slurry reabsorbed by the melamine foam when the internal air pressure of the impregnation tank returns to normal. The movement of the melamine foam is restricted by the contact airbags on the clamping plate, which can fix the melamine foam without causing damage. When the clamping plate rotates inward toward the lifting platform, it can maintain a negative pressure state inside the suction assembly. When the clamping plate returns to its original position, the internal air pressure of the suction assembly returns to atmospheric pressure, drawing the slurry near the contact area between the suction assembly and the melamine foam into the suction assembly, and then guiding it into the impregnation tank through the suction assembly. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a flowchart provided for an embodiment of the present invention;

[0028] Figure 2 This is a three-dimensional structural schematic diagram provided for an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the lifting platform structure provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the suction assembly structure provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the internal structure of the installation space provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the mounting position structure of the rotating wheel provided in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the protrusion structure provided in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Impregnation tank; 2. Lifting platform; 21. Slider; 22. Movable plate; 23. Pressure airbag; 24. Drainage channel; 25. Rotating seat; 26. Guide plate; 27. Baffle; 28. Mounting bracket; 29. ​​Rotating wheel; 3. Suction assembly; 31. Sealing rubber part; 311. Mounting plate; 312. Rubber movable flap; 32. Movable part; 321. Mounting part; 322. Folding part; 33. Connecting cylinder; 4. Clamping plate; 41. Protrusion; 411. Right angle part; 412. Arc-shaped part; 413. Flat part; 42. Connecting ring; 5. Contact airbag; 6. Limiting airbag. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Please see Figure 1 —7. A method for preparing a melamine foam microwave absorbing material, comprising the following steps:

[0038] S1: Place the melamine foam into the impregnation tank 1. The impregnation tank 1 is slidably connected to the lifting platform 2. The lifting platform 2 is equipped with a suction component 3, so that the four corners of the melamine foam come into contact with the suction component 3, and the top surface of the melamine foam forms a concave mesh surface.

[0039] S2: Rotate the clamping plate 4, which is rotatably mounted on the lifting platform 2, inward so that the contact airbag 5 on the clamping plate 4 comes into contact with the melamine foam and restricts the movement of the melamine foam.

[0040] S3: When the clamping plate 4 rotates inward, it keeps the inside of the suction assembly 3 under negative pressure and discharges the air inside the suction assembly 3.

[0041] S4: Start the impregnation tank 1 and the lifting platform 2, and pressurize them with the air pump to make the functional slurry evenly impregnate the melamine foam;

[0042] S5: Use an air pump to extract the air from the impregnation tank 1, so that the excess slurry inside the melamine foam can be discharged.

[0043] S6: Rotate the outer clamping plate 4 to make the melamine foam in an active state;

[0044] S7: When the clamping plate 4 rotates outward, the air pressure inside the suction assembly 3 is restored, and the slurry in the melamine foam in contact with the suction assembly 3 is absorbed into the suction assembly 3.

[0045] The lifting platform 2 is slidably positioned inside the impregnation tank 1 via a hydraulic lifting assembly or an electric push rod. This allows the lifting platform 2 to move within the impregnation tank 1, immersing the melamine foam placed on the lifting platform 2 into the functional slurry inside the impregnation tank 1. This ensures the slurry fully impregnates the melamine foam, improving impregnation efficiency. Specifically, the lifting platform 2 has a rectangular structure. This rectangular structure is designed to accommodate the shape of the melamine foam, which is typically uncut and in a regular rectangular shape during impregnation. The rectangular lifting platform 2 can effectively fit the shape of the melamine foam, allowing it to lie flat on the outer wall of the lifting platform 2, thus reducing foam stacking. A suction component 3 is provided on the outer wall of one side of the lifting platform 2. The melamine foam is placed on the outer wall of the lifting platform 2 through the suction component 3 to form a concave mesh surface, so as to reduce the contact area between the melamine foam and the lifting platform 2, thereby reducing the residual slurry at the contact point between the lifting platform 2 and the melamine foam.

[0046] A rotating seat 25 is fixedly installed on the outer wall of one side of the lifting platform 2. Specifically, there are two rotating seats 25. The two rotating seats 25 are symmetrical about the axis of the outer wall of one side of the lifting platform 2. A clamping plate 4 is rotatably connected inside the rotating seat 25 through a damping shaft. The clamping plate 4 is rotatably connected to the rotating seat 25 through the damping shaft, so that the clamping plate 4 can maintain a certain degree of self-locking when rotating inside the rotating seat 25. This allows the clamping plate 4 to maintain self-locking on the outer wall of the lifting platform 2, thereby limiting the melamine foam on the outer wall of the lifting platform 2 and preventing the melamine foam from shifting during the lifting and lowering movement of the lifting platform 2. Specifically, the clamping plate 4 has an "L"-shaped structure. A contact airbag 5 is fixedly installed on the inner wall of one side of the "L"-shaped structure, and a limiting airbag 6 is fixedly installed on the inner wall of the other side of the "L"-shaped structure. Preferably, the outward protrusion of the contact airbag 5 is less than the outward protrusion of the limiting airbag 6. When the clamping plate 4 rotates and keeps the outer wall of one side of the "L"-shaped structure parallel to the lifting platform 2, the clamping plate 4 is in the clamping position. The outer wall of the contact airbag 5 is in contact with the side of the melamine foam away from the lifting platform 2. Specifically, the outer wall of the contact airbag 5 is an arc-shaped structure. The arc-shaped contact airbag 5 can reduce the contact area with the melamine foam, thereby reducing the slurry remaining on the contact airbag 5. At the same time, when the clamping plate 4 is in the position and the contact airbag 5 is above the melamine foam, the slurry will automatically flow downward under the action of gravity, which can further reduce the slurry remaining between the melamine foam and the contact airbag 5. When the clamping plate 4 is in the clamping position, there is a certain gap between the outer wall of the limiting airbag 6 and the outer wall of the melamine foam. This ensures that the limiting airbag 6 will contact the outer wall of the melamine foam when the melamine foam moves. Specifically, the outer wall of the limiting airbag 6 has a wedge-shaped structure with a wave-shaped guide groove. When the outer wall of the limiting airbag 6 contacts the melamine foam, the wave-shaped guide groove and the outer wall of the melamine foam contact each other, forming a guide space. When the excess slurry inside the melamine foam is extracted by the air pump, the slurry will flow along the inner wall of the guide space, i.e., the guide groove. Because the outer wall of the limiting airbag 6 has a wedge-shaped structure, it can accelerate the flow of slurry and reduce slurry residue.

[0047] When using the equipment, the operator first needs to open the top of the impregnation tank 1, allowing the lifting platform 2 to rise to the top inside the impregnation tank 1. Then, the clamping plate 4 is rotated outward to open it. The operator then places the melamine foam onto the suction assembly 3 on the outer wall of the lifting platform 2. The suction assembly 3 supports the four corners of the melamine foam, forming a concave mesh structure on the top of the melamine foam. The operator then rotates the clamping plate 4 inward to maintain a negative pressure inside the suction assembly 3 and expel some of the air inside the suction assembly 3. The contact airbag 5 installed on the inner wall of the "L"-shaped structure of the clamping plate 4 contacts the side of the melamine foam away from the lifting platform 2. The suction assembly 3, in conjunction with the contact airbag 5 on the clamping plate 4, limits the movement of the melamine foam on the outer wall of the lifting platform 2. Then, the impregnation tank 1 and the lifting platform 2 are started to impregnate the melamine foam with the functional slurry. After a certain impregnation time, the lifting platform 2 is raised, and the air pump is then started to extract the air from the impregnation tank 1, maintaining a negative pressure inside. At this time, under the action of air pressure, excess slurry inside the melamine foam is separated and returns to the bottom of the impregnation tank 1 through the drain pipe on the outer wall of one side of the lifting platform 2, so as to reduce slurry waste and facilitate the next impregnation operation. After the impregnation operation is completed, the melamine foam on the lifting platform 2 needs to be removed and replaced. At this time, the clamping plate 4 is rotated outward of the lifting platform 2, and the air pressure inside the suction assembly 3 is restored. At this time, the suction assembly 3 absorbs the residual slurry at the contact point with the melamine foam into the suction assembly 3.

[0048] In this invention, melamine foam is mounted on a lifting platform 2 via a suction assembly 3, which reduces the contact area between the melamine foam and the lifting platform 2. This reduces the amount of slurry reabsorbed by the melamine foam when the internal air pressure of the impregnation tank 1 returns to normal. The movement of the melamine foam is restricted by the contact airbags 5 on the clamping plate 4, which can fix the melamine foam without causing damage. When the clamping plate 4 rotates inward toward the lifting platform 2, it can maintain a negative pressure state inside the suction assembly 3. When the clamping plate 4 returns to its original position, the internal air pressure of the suction assembly 3 returns to atmospheric pressure, and the slurry near the contact area between the suction assembly 3 and the melamine foam is drawn into the suction assembly 3 and then guided into the impregnation tank 1 through the suction assembly 3.

[0049] Multiple suction components 3 are fixedly installed on the outer wall of one side of the lifting platform 2, with one end of each suction component 3 protruding from the outer wall of the lifting platform 2. Specifically, there are four suction components 3, which are respectively installed on the outer wall of the lifting platform 2 in a rectangular array. During use, the suction components 3 in the rectangular array protrude from the lifting platform 2 and contact the melamine foam to support the four corners of the melamine foam and support it on the outer wall of the lifting platform 2. After the melamine foam is supported by the four suction components 3, the melamine foam has a concave mesh structure and only contacts the suction components 3. This means that only the part in contact with the suction components 3 will have excess slurry remaining. Because the contact area between the melamine foam and the lifting platform 2 is reduced, when the impregnation tank 1 returns to normal air pressure, only the slurry remaining outside the suction components 3 will be reabsorbed into the melamine foam, which can reduce the amount of slurry remaining inside the melamine foam.

[0050] The lifting platform 2 has an installation space inside. The suction assembly 3 includes a sealing rubber part 31 and a connecting cylinder 33. The connecting cylinder 33 is fixedly installed on the outer wall of one side of the lifting platform 2, and one end of the connecting cylinder 33 extends through and into the installation space. One end of the sealing rubber part 31 is fixedly installed on the end of the connecting cylinder 33 located at the top of the lifting platform 2. Specifically, the connecting cylinder 33 has a rectangular structure. The sealing rubber part 31 includes a mounting plate 311 and a rubber movable flap 312. The rubber movable flap 312 has a semi-circular arc structure. The rubber movable flap 312 is fixedly installed on the outer wall of the mounting plate 311, and the outer wall of the mounting plate 311 has through holes for the passage of slurry and air. The mounting plate 311 is fixedly installed on the end of the connecting cylinder 33 located outside the lifting platform 2, and the rubber movable flap 312 contacts the outer wall of one side of the melamine foam through one end of the arc structure. The melamine foam is supported by multiple rubber movable flaps 312 arranged in a rectangular array, so that the four corners of the melamine foam are supported, forming a concave mesh structure. The concave structure of the mesh surface can reduce the contact area with the lifting platform 2, thereby reducing residual slurry.

[0051] The suction assembly 3 also includes a movable part 32, specifically, the movable part 32 is disposed at one end of the connecting cylinder 33 located inside the installation space of the lifting platform 2. As one embodiment of the present invention, please refer to... Figure 3 and Figure 5Specifically, the movable part 32 includes a mounting part 321 and a folding part 322. The shape of the mounting part 321 is adapted to the shape of the connecting cylinder 33. The folding part 322 is mounted on the outer wall of one side of the mounting part 321. The folding part 322 is connected to the end of the connecting cylinder 33 located inside the mounting space through the mounting part 321. The outer wall of the folding part 322 is provided with multiple corrugations, and one end of the folding part 322 can be quickly folded through the corrugations. When the end of the folding part 322 away from the connecting cylinder 33 is squeezed, the end of the folding part 322 will fold towards the end of the connecting cylinder 33 under the action of the squeezing force, and squeeze the air inside the connecting cylinder 33, causing the air inside the connecting cylinder 33 to escape, thereby maintaining a negative pressure state inside the connecting cylinder 33. Thus, when the clamping plate 4 rotates outward to the lifting platform 2, excess slurry is sucked into the connecting cylinder 33. The air inside the connecting cylinder 33 is discharged through the folding part 322. More air can be discharged when the folding part 322 moves, so that more slurry can be drawn when pumping out excess slurry, and more slurry can be contained when there is more excess slurry.

[0052] As one embodiment of the present invention, the movable part 32 is specifically a piston rod. One end of the piston rod is provided with a rubber piston, and the piston rod is slidably disposed inside the connecting cylinder 33. When the piston rod is subjected to pressure and slides outward inside the connecting cylinder 33, the rubber piston at one end of the piston rod can push the air inside the connecting cylinder 33, causing the air inside the connecting cylinder 33 to move to the outside of the connecting cylinder 33, thereby maintaining a negative pressure state inside the connecting cylinder 33 to draw excess slurry into the connecting cylinder 33. Using a piston rod to maintain a negative pressure state inside the connecting cylinder 33 can provide a greater suction force, thereby quickly drawing the slurry into the connecting cylinder 33 when there is little excess slurry.

[0053] Guide plates 26 are symmetrically installed on the outer wall of one side of the lifting platform 2. Specifically, the guide plates 26 are rectangular in structure and are symmetrical about the axis of the outer wall of the connecting cylinder 33. A slider 21 is slidably connected between the two guide plates 26 through a guide component. Specifically, the slider 21 is rectangular in structure and is connected to one of the rubber movable flaps 312 through a connecting belt. When the slider 21 is sliding, the connecting belt can drive one of the rubber movable flaps 312 and make one of the rubber movable flaps 312 rotate, so that the two originally closed rubber movable flaps 312 open, and the air can circulate on both sides of the rubber movable flaps 312.

[0054] A protrusion 41 is fixedly installed on the outer wall of one side of the "L"-shaped structure of the clamping plate 4. The protrusion 41 rotates together with the clamping plate 4. Multiple abutment parts are fixedly provided on the outer wall of one side of the protrusion 41. The multiple abutment parts include a right-angle part 411, an arc-shaped part 412, and a flat part 413. Specifically, the right-angle part 411, the arc-shaped part 412, and the flat part 413 are connected in sequence. The outer wall of the slider 21 away from the connecting cylinder 33 is specifically an arc-shaped structure. When the clamping plate 4 rotates into the lifting platform 2, one end of the arc-shaped structure of the slider 21 moves on the outer wall of the abutment part. When the slider 21 slides away from the connecting cylinder 33, the connecting belt is taut. The slider 21 pulls one of the rubber movable flaps 312 through the connecting belt, opening the closed rubber movable flap 312. When the slider 21 slides towards the connecting cylinder 33, the connecting belt loosens. Since the rubber movable flap 312 is made of rubber and has a certain elasticity, it can reset the rubber movable flap 312, thereby keeping the rubber movable flap 312 sealed. This allows the slider 21 to slide and open and close the sealing rubber part 31.

[0055] A reset unit is fixedly installed between the outer wall of one side of the slider 21 and the outer wall of one side of the connecting cylinder 33. Specifically, the reset unit is a compression spring, with one end of the compression spring fixedly connected to the outer wall of one side of the connecting cylinder 33 and the other end fixedly connected to the outer wall of one side of the slider 21. The elasticity of the compression spring itself allows the slider 21 to always tend to move away from the connecting cylinder 33. Since the slider 21 is connected to one of the rubber movable flaps 312 via a connecting belt, under the drive of the compression spring, the slider 21 always maintains a certain distance from the outer wall of one side of the connecting cylinder 33, thereby keeping one of the rubber movable flaps 312 normally open.

[0056] Please see Figure 3 and Figure 5Three baffles 27 are fixedly installed on the bottom surface inside the installation space of the lifting platform 2, and these three baffles 27 are arranged in a rectangular array on the bottom surface inside the installation space. A movable plate 22 is slidably connected between two of the baffles 27, allowing the movable plate 22 to slide freely between the two baffles 27. Specifically, guide wheels are rotatably connected to the outer walls of the movable plate 22 on opposite sides, and the outer walls of the movable plate 22 are slidably connected to the outer wall of the top of the baffle 27 via the guide wheels. When the movable plate 22 slides inside the baffle 27, the guide wheels roll on the top of the baffle 27. A connecting ring 42 is fixedly installed on the outer wall of one side of the "L"-shaped structure of the clamping plate 4. Specifically, the connecting ring 42 is a hollow annular structure. A mounting frame 28 is fixedly installed on the bottom surface inside the installation space. A rotating wheel 29 is rotatably connected inside the mounting frame 28 via a rotating shaft. The shaft of the rotating wheel 29 passes through and extends out of the outer walls of opposite sides of the mounting frame 28. A through hole is provided on the outer wall of one side of the lifting platform 2, which communicates with the interior of the installation space. The connecting ring 42 is connected to the shaft of the guide wheel via a connecting rope and the rotating wheel 29. When the clamping plate 4 rotates toward the interior of the lifting platform 2, the connecting rope moves on the rotating wheel 29, thereby pulling the movable plate 22 connected to the other end of the connecting rope to slide between the baffles 27.

[0057] A pressure airbag 23 is fixedly installed on the bottom surface inside the installation space. Specifically, the pressure airbag 23 has a rectangular structure and is fixedly arranged in a rectangular array formed by three baffles 27. The movable plate 22 is located on the side of the pressure airbag 23 away from the rotating wheel 29. Therefore, when the clamping plate 4 rotates towards the inside of the lifting platform 2, the movable plate 22 can be pulled by the connecting rope to keep it moving towards the pressure airbag 23 and to make the movable plate 22 abut against the outer wall of the pressure airbag 23, squeezing the outer wall of the pressure airbag 23, causing one side of the outer wall of the pressure airbag 23 to protrude outward. The pressure airbag 23 abuts against the movable part 32 of the suction assembly 3 and pushes the movable part 32 to move, so that the inside of the suction assembly 3 is kept in a negative pressure state. Specifically, when the movable part 32 has a corrugated structure, its interior is hollow, and one end of the folding part 322 is equipped with a rubber sealing structure. When the pressure airbag 23 moves outward, the outer wall of one side of the pressure airbag 23 abuts against the rubber sealing structure of the folding part 322, keeping the interior of the movable part 32 sealed. The movable part 32 also compresses the air inside the connecting cylinder 33, maintaining a negative pressure state inside the connecting cylinder 33. Furthermore, the folding part 322 is an elastic structure; when the clamping plate 4 rotates outward toward the lifting platform 2, the pressure airbag 23 returns to its original position. At this time, under the action of the folding part 322 of the elastic structure, one end of the folding part 322 returns to its shape, thereby reducing the air pressure inside the connecting cylinder 33 and drawing the slurry at the contact point between the rubber movable flap 312 and the melamine foam into the interior of the connecting cylinder 33. When the pressure airbag 23 is further reset, the outer wall on one side of the pressure airbag 23 separates from the outer wall on one side of the folding part 322. At this time, the folding part 322 remains in communication with the interior of the installation space, and the slurry inside the connecting cylinder 33 flows into the interior of the installation space and flows back into the impregnation tank 1 through the liquid permeation groove opened inside the installation space.

[0058] When the movable part 32 is a piston rod, one end of the piston rod is fixedly installed on the outer wall of the pressure airbag 23. When one side of the outer wall of the pressure airbag 23 protrudes outward, the pressure airbag 23 pushes one end of the piston rod to slide inside the connecting cylinder 33 and squeezes out the air inside the connecting cylinder 33, so that the inside of the connecting cylinder 33 is kept under negative pressure. When the clamping plate 4 is reset, the pressure airbag 23 is reset and pushes the movable plate 22 to reset, while pulling the piston rod to reset, thereby adsorbing the slurry at the contact point between the rubber movable flap 312 and the melamine foam into the inside of the connecting cylinder 33.

[0059] Please see Figure 2Several mounting holes are provided on the outer wall of one side of the lifting platform 2. Specifically, there are eight mounting holes, which are arranged in a rectangular array on the outer wall of one side of the lifting platform 2. A receiving groove is provided on the inner wall of the mounting hole, and a drainage channel 24 is fixedly installed in the mounting hole. The drainage channel 24 is specifically an elastic pipe. A connecting belt is provided inside the receiving groove. The two ends of the connecting belt are respectively connected to the shaft of the rotating wheel on both sides of the outer wall of the movable plate 22. When the movable plate 22 moves towards the pressure airbag 23 under the drive of the clamping plate 4, the connecting belt squeezes the outer wall of the drainage channel 24, reducing the inner diameter of the drainage channel 24. A flow hole is provided at the axis of the lifting platform 2. Preferably, the diameter of the flow hole is small. Regarding the diameter of the drainage channel 24, during impregnation, when the lifting platform 2 is immersed in the slurry, the slurry enters the drainage channel 24 and the flow hole respectively. Since the diameter of the flow hole is larger than the diameter of the drainage channel 24, and the drainage channel 24 is deformed by the connecting belt when the clamping plate 4 is in the clamping position, the inner diameter decreases. Therefore, when the slurry enters the drainage channel 24 and the flow hole, the slurry inside the drainage channel 24 will pass through first, and the slurry in the flow channel will pass through slightly slower than the slurry inside the drainage channel 24. This forms a concave arc liquid surface on the outer wall of the top of the lifting platform 2, which is compatible with the concave mesh structure of the melamine foam installed on the outer wall of the lifting platform 2, ensuring uniform impregnation.

[0060] The compression spring mentioned in this article has an elastic coefficient that meets the technical requirements of the present invention.

[0061] Those skilled in the art will understand that other similar connection methods can also achieve the present invention. For example, welding, bonding, or screwing.

[0062] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for preparing a melamine foam microwave absorbing material, characterized in that, Includes the following steps: S1: Place the melamine foam into the impregnation tank (1), and the impregnation tank (1) is slidably connected to the lifting platform (2); the lifting platform (2) is provided with a suction component (3) so that the four corners of the melamine foam come into contact with the suction component (3) and the top surface of the melamine foam forms a concave mesh surface. S2: Rotate the clamping plate (4) that is rotatably set on the lifting platform (2) inward so that the contact airbag (5) on the clamping plate (4) comes into contact with the melamine foam and restricts the movement of the melamine foam. S3: When the clamping plate (4) rotates inward, it keeps the inside of the suction assembly (3) under negative pressure, and exhausts the air inside the suction assembly (3). The lifting platform moves inside the impregnation tank through the hydraulic lifting assembly or electric push rod to immerse the melamine foam placed on the lifting platform into the functional slurry inside the impregnation tank. S4: Start the impregnation tank (1) and the lifting platform (2), and pressurize the pump to evenly impregnate the functional slurry into the melamine foam. S5: Raise the lifting platform (2) and use the air pump to extract the air from the impregnation tank (1) so that the excess slurry inside the melamine foam can be discharged. S6: Rotate the clamping plate (4) outward to make the melamine foam in an active state; S7: When the clamping plate (4) rotates outward, the air pressure inside the suction assembly (3) is restored, and the slurry in the melamine foam in contact with the suction assembly (3) is absorbed into the suction assembly (3).

2. The method for preparing a melamine foam microwave absorbing material according to claim 1, characterized in that, One end of the suction component (3) protrudes from the outer wall of the lifting platform (2), and the end of the suction component (3) protruding from the lifting platform (2) contacts the melamine foam, so that the melamine foam is mounted on the lifting platform (2).

3. The method for preparing a melamine foam microwave absorbing material according to claim 2, characterized in that, The suction assembly (3) includes a sealing rubber part (31), which is located at one end of the suction assembly (3) outside the lifting platform (2) and is in contact with melamine foam.

4. The method for preparing a melamine foam microwave absorbing material according to claim 3, characterized in that, A slider (21) is slidably disposed on the lifting platform (2). The slider (21) is connected to the sealing rubber part (31). The slider (21) is kept sliding by rotating inward through the clamping plate (4) in step S3, so that the sealing rubber part (31) can open and close.

5. The method for preparing a melamine foam microwave absorbing material according to claim 4, characterized in that, A protrusion (41) is provided on the outer wall of one side of the clamping plate (4), and a plurality of abutment portions are provided on the protrusion (41). The clamping plate (4) abuts against the slider (21) through the protrusion (41) so that the slider (21) keeps sliding.

6. The method for preparing a melamine foam microwave absorbing material according to claim 4, characterized in that, A reset unit is provided between the slider (21) and the suction assembly (3). In step S7, the suction assembly (3) is reset by the reset unit, and the slider (21) is pushed away from the suction assembly (3) by the reset unit so that the sealing rubber part (31) is normally open.

7. The method for preparing a melamine foam microwave absorbing material according to claim 2, characterized in that, The suction assembly (3) further includes a movable part (32) which is driven to remain movable so that air inside the suction assembly (3) is discharged.

8. The method for preparing a melamine foam microwave absorbing material according to claim 1, characterized in that, The lifting platform (2) has a movable plate (22) slidably disposed inside. The movable plate (22) is connected to the clamping plate (4). The movable plate (22) is driven by the clamping plate (4) to slide inside the lifting platform (2).

9. The method for preparing a melamine foam microwave absorbing material according to claim 8, characterized in that, The lifting platform (2) is fixedly equipped with a pressure airbag (23). The pressure airbag (23) is abutted by the movable plate (22) and expands outward, so that the pressure airbag (23) abuts against the suction assembly (3), thereby causing the air inside the suction assembly (3) to be discharged.

10. The method for preparing a melamine foam microwave absorbing material according to claim 8, characterized in that, In step S4, the slurry enters the lifting platform (2) through a drainage channel (24) provided on the lifting platform (2). The drainage channel (24) is an elastic pipe that runs through the lifting platform (2). The outer wall of the drainage channel (24) is connected to the movable plate (22) through a connecting belt. The movable plate (22) slides through the connecting belt to squeeze the outer wall of the drainage channel (24), thereby reducing the inner diameter of the drainage channel (24).

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