Preparation method of high-purity graphite felt and graphite felt holding furnace

Abstract

The invention discloses a preparation method of a high-purity graphite felt and a graphite felt holding furnace, and relates to the technical field of high-purity graphite felt.The preparation method comprises the following steps that 1, raw materials are selected and prepared, specifically, appropriate raw materials such as natural crystalline flake graphite or artificial graphite are selected and subjected to the processes of crushing, screening and the like, and appropriate graphite particles are obtained; step 2, mixing, forming and drying: fully mixing the graphite particles with additives such as a binder and a plasticizer to obtain a uniform material, then forming the material into a required shape by means of mold pressing or extrusion and the like, and then drying to remove moisture; by arranging the overturning assembly, the felt body can rotate, and therefore when the felt body is vertically placed for cooling, compared with horizontal placement for cooling, the cooling efficiency is higher, and hot air can rapidly flow upwards from the two sides of the felt body without being hindered.

Description

Technical Field

[0001] The invention relates to the technical field of high-purity graphite felt preparation, in particular to a method for preparing high-purity graphite felt and a graphite felt insulation furnace. Background Art

[0002] When preparing high-purity graphite felt, the sintering furnace needs to be cooled to below 100°C, then taken out, unfolded and cooled to obtain high-purity graphite felt.

[0003] However, the applicant found that the area occupied when the high-purity graphite felt is expanded for cooling is large, and the efficiency of natural cooling is not high, which affects the cooling of the next batch of high-purity graphite felt, thereby affecting the preparation of the next batch of high-purity graphite felt. For this reason, we propose a preparation method of high-purity graphite felt and a graphite felt insulation furnace. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing high-purity graphite felt and a graphite felt insulation furnace to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing high-purity graphite felt, comprising the following steps:

[0006] Step 1: Raw material selection and preparation: Select suitable raw materials, such as natural flake graphite or artificial graphite, and carry out crushing, screening and other processes to obtain suitable graphite particles;

[0007] Step 2: Mixing, molding and drying: the graphite particles are fully mixed with additives such as binders and plasticizers to obtain a uniform material. Subsequently, the material is molded into a desired shape by molding or extrusion, and then dried to remove moisture;

[0008] Step 3: Heat treatment, roll the graphite core rod into the carbon felt to obtain a carbon felt roll, and then place the carbon felt roll in a sintering furnace with a furnace pressure of less than 30Pa for segmented temperature-controlled sintering, first raise the temperature to 600-800°C, keep warm for 100-140min, then raise the temperature to 2000-2200°C, keep warm for 200-280min, introduce Freon and argon into the sintering furnace, and then discharge them with a vacuum pump, keep warm for 150-200min, and finally introduce argon, cool the sintering furnace to below 100°C, take out, unfold and cool through a cooling device to obtain high-purity graphite felt.

[0009] As a preferred embodiment of the method for preparing a high-purity graphite felt described in the present invention, the cooling device comprises a fixed frame, a blowing assembly is connected to the fixed frame, connecting rods are evenly arranged on the fixed frame, the tops of the connecting rods are all fitted and connected with a felt body, fixing assemblies for fixing the felt body are evenly arranged on the fixed frame, a supporting assembly is fitted and connected to the felt body, and a flip assembly is connected to the fixed frame.

[0010] As a preferred embodiment of the method for preparing a high-purity graphite felt described in the present invention, the blowing assembly includes a fixed cover arranged on a fixed frame, a motor 1 is arranged on the fixed cover, a fan blade is arranged on the output shaft of the motor 1, the fan blade is located in the fixed cover, and the fan blade is opposite to each felt body.

[0011] As a preferred solution of the method for preparing high-purity graphite felt described in the present invention, filter screens are evenly arranged on the fixed cover.

[0012] As a preferred solution of the method for preparing a high-purity graphite felt described in the present invention, the fixing assembly includes two electric telescopic rods with the same structure, a top rod is arranged on the output end of the electric telescopic rod, the top rod is in contact with one end of the felt body, and the other end of the felt body is fittedly connected with a bottom rod, the bottom rod and the electric telescopic rod are both connected to the fixing frame, wherein the bottom rod and the top rod are both U-shaped structures.

[0013] As a preferred solution of the method for preparing a high-purity graphite felt described in the present invention, the support assembly includes two support plates with the same structure, the support plates on both sides are slidably connected to the bottom rods on both sides, and the support plates on both sides are in contact with the felt body, a mounting frame is provided on the fixed frame, a second motor is provided on the mounting frame, a bidirectional screw is provided on the output shaft of the second motor, and the support plates on both sides are screwed on both sides of the bidirectional screw respectively.

[0014] As a preferred solution of the method for preparing a high-purity graphite felt described in the present invention, the flip assembly includes a rotating shaft, which is connected to a fixed frame, and the front and rear sides of the rotating shaft are connected to fixed legs through bearings, and a motor three is provided on the fixed leg, and the output shaft of the motor three is connected to the rotating shaft.

[0015] As a preferred solution of the method for preparing high-purity graphite felt described in the present invention, the fixing frame is provided with supporting legs.

[0016] As a preferred embodiment of the method for preparing a high-purity graphite felt according to the present invention, the method for using the cooling device comprises the following steps:

[0017] First, unfold the felt body taken out from the sintering furnace, and then pull it in between the top rod and the bottom rod one by one to abut against the connecting rod, so that the bottom of the felt body can be supported by the bottom rod and the support plate, and then the top rod is driven downward by the electric telescopic rod to press the felt body, so that the four sides of the felt body are respectively fixed by the bottom rod and the top rod, and then the two-way screw rod is driven to rotate by the second motor, so that the support plates on both sides slide to the side away from each other under the guidance of the bottom rods on both sides, so that the support plates no longer contact the felt body, and at this time the legs contact the ground to support the fixed frame;

[0018] Then, the motor 3 drives the rotating shaft to rotate counterclockwise by 90 degrees, so that the fixed frame can rotate accordingly, so that the legs leave the ground, and each felt body can be vertical. At this time, the motor 1 can be turned on to rotate the fan blades, and then the external air is filtered through the filter and blown upward, so that the high-speed airflow flows upward through both sides of the felt body, thereby quickly driving the felt body to cool down;

[0019] After cooling is completed, the fixing frame is rotated clockwise to make the felt body horizontal and then it can be removed. At this time, the legs are in contact with the ground to support the fixing frame.

[0020] A graphite felt insulation furnace comprises a furnace body and a heat insulation layer arranged on the furnace body, wherein the heat insulation layer is high-purity graphite felt, and the high-purity graphite felt is prepared by the above-mentioned preparation method.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By setting up a flip assembly, the felt body can be rotated, and then when it is placed vertically for cooling, the cooling efficiency is higher than that when it is placed horizontally for cooling, because the hot air can flow upward quickly from both sides of the felt body without obstruction;

[0023] 2. By placing the fixing frame horizontally, it is convenient to lay the felt body flat through the support plate and the bottom rod, and then quickly fix the felt body by pressing down through the top rod, so that the felt body is more stable when cooled by air blowing. When laid flat, the support plate of the support assembly supports the felt body, which can avoid the problem of manual fixation of the felt body due to the softness of the felt body sagging downward, thereby improving the efficiency of fixing the felt body. After the fixing assembly fixes the felt body, the support plate of the support assembly can leave the support plate, so that the cold air flow can directly act on the felt body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a cooling device for a method for preparing high-purity graphite felt and a graphite felt insulation furnace of the present invention;

[0025] Figure 2 It is a structural schematic diagram of a method for preparing high-purity graphite felt and a graphite felt insulation furnace of the present invention when the felt body is placed horizontally;

[0026] Figure 3 It is a schematic diagram of the structure of the blowing assembly of a method for preparing high-purity graphite felt and a graphite felt insulation furnace of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of a blowing component and a fixing component of a method for preparing high-purity graphite felt and a graphite felt insulation furnace of the present invention;

[0028] Figure 5 It is an enlarged schematic diagram of the structure of the felt body, the top rod and the bottom rod of a method for preparing high-purity graphite felt and a graphite felt insulation furnace of the present invention;

[0029] Figure 6 The present invention provides a method for preparing high-purity graphite felt and a schematic structural diagram of a fixing component and a supporting component of a graphite felt insulation furnace.

[0030] In the figure: 1. fixed frame; 2. fixed cover; 3. motor 1; 4. fan blades; 5. connecting rod; 6. felt body; 7. bottom rod; 8. electric telescopic rod; 9. top rod; 10. support plate; 11. bidirectional screw rod; 12. motor 2; 13. mounting frame; 14. filter screen; 15. rotating shaft; 16. fixed leg; 17. motor 3; 18. support leg. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] As mentioned in the background technology, in view of the problem that the high-purity graphite felt in the prior art occupies a large area when being cooled and the efficiency of natural cooling is not high, the present invention provides a method for preparing high-purity graphite felt and a graphite felt insulation furnace.

[0033] Example 1

[0034] Reference Figures 1 to 6 , a method for preparing high-purity graphite felt, comprising the following steps,

[0035] Step 1: Raw material selection and preparation: Select suitable raw materials, such as natural flake graphite or artificial graphite, and carry out crushing, screening and other processes to obtain suitable graphite particles;

[0036] Step 2: Mixing, molding and drying: the graphite particles are fully mixed with additives such as binders and plasticizers to obtain a uniform material. Subsequently, the material is molded into a desired shape by molding or extrusion, and then dried to remove moisture;

[0037] Step 3: Heat treatment, roll the graphite core rod into the carbon felt to obtain a carbon felt roll, and then place the carbon felt roll in a sintering furnace with a furnace pressure of less than 30Pa for segmented temperature-controlled sintering, first raise the temperature to 600-800°C, keep warm for 100-140min, then raise the temperature to 2000-2200°C, keep warm for 200-280min, introduce Freon and argon into the sintering furnace, and then discharge them with a vacuum pump, keep warm for 150-200min, and finally introduce argon, cool the sintering furnace to below 100°C, take out, unfold and cool through a cooling device to obtain high-purity graphite felt.

[0038] The cooling device includes a fixed frame 1, to which a blowing assembly is connected, connecting rods 5 are evenly arranged on the fixed frame 1, and the tops of the connecting rods 5 are all fitted and connected with a felt body 6, fixing assemblies for fixing the felt body 6 are evenly arranged on the fixed frame 1, a supporting assembly is fitted and connected to the felt body 6, and a flip assembly is connected to the fixed frame 1.

[0039] The blowing assembly includes a fixed cover 2 arranged on a fixed frame 1, a motor 3 is arranged on the fixed cover 2, a fan blade 4 is arranged on the output shaft of the motor 3, the fan blade 4 is located in the fixed cover 2, and the fan blade 4 is opposite to each felt body 6, so that the fan blade 4 rotates to blow air.

[0040] Filter screens 14 are evenly arranged on the fixed cover 2 for filtering external air.

[0041] The fixing assembly includes two electric telescopic rods 8 of the same structure. A top rod 9 is arranged on the output end of the electric telescopic rod 8 to drive the top rod 9 to rise and fall. The top rod 9 is in contact with one end of the felt body 6, and the other end of the felt body 6 is fittedly connected with a bottom rod 7. The bottom rod 7 and the electric telescopic rod 8 are both connected to the fixing frame 1, wherein the bottom rod 7 and the top rod 9 are both U-shaped structures, which can reduce the contact area with the felt body 6 to facilitate better cooling of the felt body 6.

[0042] The support assembly includes two support plates 10 with the same structure. The support plates 10 on both sides are slidably connected to the bottom rods 7 on both sides, and the support plates 10 on both sides are in contact with the felt body 6. A mounting frame 13 is provided on the fixed frame 1, and a motor 12 is provided on the mounting frame 13. A bidirectional screw rod 11 is provided on the output shaft of the motor 12. The support plates 10 on both sides are respectively screwed on both sides of the bidirectional screw rod 11. The support plates 10 can move in the front and rear directions. When placed flat, they are first supported by the support plates 10 to prevent the felt body 6 from sagging downward from between the bottom rods 7 on both sides due to its softness in the middle. When cooling, the support plates 10 on both sides can be separated from the felt body 6.

[0043] The flip assembly includes a rotating shaft 15, which is connected to the fixed frame 1. The front and rear sides of the rotating shaft 15 are connected to fixed legs 16 through bearings. A motor 3 17 is provided on the fixed leg 16. The output shaft of the motor 3 17 is connected to the rotating shaft 15, and is used to drive the fixed frame 1 to rotate, so that the felt body 6 rotates with it, that is, it can be placed for fixing when horizontal, and cooled when vertical. The fixed leg 16 is fixed to the ground.

[0044] The fixing frame 1 is provided with supporting legs 18 so that when the fixing frame 1 is horizontal, the supporting legs 18 contact the ground for support.

[0045] Example 2

[0046] Reference Figures 1 to 6 The method for using the cooling device comprises the following steps:

[0047] First, unfold the felt body 6 taken out from the sintering furnace, and then pull it one by one from between the top rod 9 and the bottom rod 7 to abut against the connecting rod 5, so that the bottom of the felt body 6 can be supported by the bottom rod 7 and the support plate 10, and then the top rod 9 is driven by the electric telescopic rod 8 to move down and press the felt body 6, so that the four sides of the felt body 6 are respectively fixed by the bottom rod 7 and the top rod 9, and then the two-way screw rod 11 is driven by the motor 2 12 to rotate, so that the support plates 10 on both sides slide to the side away from each other under the guidance of the bottom rods 7 on both sides, so that the support plates 10 no longer contact the felt body 6, and at this time, the legs 18 contact the ground to support the fixed frame 1;

[0048] Then, the motor 3 17 drives the rotating shaft 15 to rotate counterclockwise by 90 degrees, so that the fixed frame 1 can rotate accordingly, so that the legs 18 leave the ground, and each felt body 6 can be vertical. At this time, the motor 1 3 can be turned on to rotate the fan blades 4, and then the external air is filtered by the filter 14 and blown upward, so that the high-speed airflow flows upward through both sides of the felt body 6, thereby quickly driving the felt body 6 to cool down;

[0049] After cooling is completed, the fixing frame 1 is rotated clockwise to make the felt body 6 horizontal and then removed. At this time, the legs 18 contact the ground to support the fixing frame 1.

[0050] The rest of the structure is the same as that of Example 1.

[0051] The graphite felt insulation furnace comprises a furnace body and a heat insulation layer arranged on the furnace body, wherein the heat insulation layer is high-purity graphite felt, and the high-purity graphite felt is prepared by the preparation method in Example 2.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing high-purity graphite felt, characterized in that: The following steps are included: Step 1: Raw material selection and preparation: Select suitable raw materials, such as natural flake graphite or artificial graphite, and carry out crushing, screening and other processes to obtain suitable graphite particles; Step 2: Mixing, molding and drying: the graphite particles are fully mixed with additives such as binders and plasticizers to obtain a uniform material. Subsequently, the material is molded into a desired shape by molding or extrusion, and then dried to remove moisture; Step 3: Heat treatment, roll the graphite core rod into the carbon felt to obtain a carbon felt roll, and then place the carbon felt roll in a sintering furnace with a furnace pressure of less than 30Pa for segmented temperature-controlled sintering, first raise the temperature to 600-800°C, keep warm for 100-140min, then raise the temperature to 2000-2200°C, keep warm for 200-280min, introduce Freon and argon into the sintering furnace, and then discharge them with a vacuum pump, keep warm for 150-200min, and finally introduce argon, cool the sintering furnace to below 100°C, take out, unfold and cool through a cooling device to obtain high-purity graphite felt.

2. The method for preparing high-purity graphite felt according to claim 1, characterized in that: The cooling device comprises a fixed frame (1), the fixed frame (1) is connected to a blowing assembly, the fixed frame (1) is evenly provided with connecting rods (5), the tops of the connecting rods (5) are evenly connected to a felt body (6), the fixed frame (1) is evenly provided with fixing assemblies for fixing the felt body (6), the felt body (6) is evenly connected to a supporting assembly, and the fixed frame (1) is connected to a flip assembly.

3. The method for preparing high-purity graphite felt according to claim 2, characterized in that: The blowing assembly comprises a fixed cover (2) arranged on a fixed frame (1), a motor (3) being arranged on the fixed cover (2), a fan blade (4) being arranged on the output shaft of the motor (3), the fan blade (4) being located inside the fixed cover (2), and the fan blade (4) being opposite to each felt body (6).

4. The method for preparing high-purity graphite felt according to claim 3, characterized in that: Filter screens (14) are evenly arranged on the fixed cover (2).

5. The method for preparing high-purity graphite felt according to claim 4, characterized in that: The fixing assembly comprises two electric telescopic rods (8) of the same structure, wherein a top rod (9) is arranged on the output end of the electric telescopic rod (8), the top rod (9) is in contact with one end of a felt body (6), and the other end of the felt body (6) is fittedly connected with a bottom rod (7), and the bottom rod (7) and the electric telescopic rod (8) are both connected to a fixing frame (1), wherein the bottom rod (7) and the top rod (9) are both U-shaped structures.

6. The method for preparing high-purity graphite felt according to claim 5, characterized in that: The support assembly comprises two support plates (10) of the same structure, the support plates (10) on both sides are slidably connected to the bottom rods (7) on both sides, and the support plates (10) on both sides are in contact with the felt body (6), the fixed frame (1) is provided with a mounting frame (13), a second motor (12) is provided on the mounting frame (13), a bidirectional screw rod (11) is provided on the output shaft of the second motor (12), and the support plates (10) on both sides are respectively screwed to the two sides of the bidirectional screw rod (11).

7. The method for preparing high-purity graphite felt according to claim 6, characterized in that: The flip assembly comprises a rotating shaft (15), the rotating shaft (15) is connected to a fixed frame (1), the front and rear sides of the rotating shaft (15) are connected to fixed legs (16) via bearings, a motor three (17) is arranged on the fixed legs (16), and the output shaft of the motor three (17) is connected to the rotating shaft (15).

8. The method for preparing high-purity graphite felt according to claim 7, characterized in that: The fixing frame (1) is provided with supporting legs (18).

9. The method for preparing high-purity graphite felt according to claim 8, characterized in that: The method for using the cooling device comprises the following steps: First, the felt body (6) taken out from the sintering furnace is unfolded, and then pulled one by one from between the top rod (9) and the bottom rod (7) to contact the connecting rod (5), so that the bottom of the felt body (6) is supported by the bottom rod (7) and the support plate (10), and then the top rod (9) is driven downward by the electric telescopic rod (8) to press the felt body (6), so that the four sides of the felt body (6) are respectively fixed by the bottom rod (7) and the top rod (9), and then the two-way screw rod (11) is driven by the second motor (12) to rotate, so that the support plates (10) on both sides slide toward the side away from each other under the guidance of the bottom rods (7) on both sides, so that the support plates (10) no longer contact the felt body (6), and at this time, the legs (18) contact the ground to support the fixed frame (1); Then, the motor 3 (17) drives the rotating shaft (15) to rotate counterclockwise by 90 degrees, so that the fixed frame (1) can rotate accordingly, so that the legs (18) leave the ground, so that each felt body (6) can be in a vertical position. At this time, the motor 1 (3) can be turned on to rotate the fan blades (4), so that the external air is filtered by the filter screen (14) and blown upward, so that the high-speed airflow flows upward through both sides of the felt body (6), thereby quickly driving the felt body (6) to cool; After cooling is completed, the fixing frame (1) is rotated clockwise to make the felt body (6) horizontal and then removed. At this time, the legs (18) contact the ground to support the fixing frame (1).

10. Graphite felt insulation furnace, characterized by: It comprises a furnace body and a heat insulating layer arranged on the furnace body, wherein the heat insulating layer is high-purity graphite felt, and the high-purity graphite felt is prepared by the preparation method according to any one of claims 1 to 9.

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