Mixing and kneading method for ultrafine powder isostatic pressing graphite powder

Abstract

The invention relates to a superfine powder isostatic pressing graphite powder mixing and kneading method which comprises the following steps: 1, blanking: weighing superfine powder a and placing the weighed superfine powder a on a receiving disc; 2, the superfine powder b is weighed and placed on a receiving disc; in the conveying step, the ultrafine powder a and the ultrafine powder b on the receiving disc are conveyed into a mixing and kneading device through a conveying pipe, and in the mixing and kneading step, the powder materials are mixed and kneaded through the mixing and kneading device. The method has the advantage of being high in efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of isostatic graphite production, and in particular to a method for mixing and kneading ultrafine isostatic graphite powder. Background Art

[0002] In order to make isostatic graphite have better performance, the existing preparation methods have improved the performance of isostatic graphite by using ultrafine powder. For example, the preparation method of high-performance fine isostatic graphite disclosed in announcement number CN112408985B uses ultrafine powder a and ultrafine powder b to prepare isostatic graphite. However, the existing mixing method is to mix the two powders and then knead them, which is inefficient. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, one of the purposes of this application is to provide a method for mixing and kneading ultrafine isostatically pressed graphite powder, which has the advantage of high efficiency.

[0004] The above-mentioned purpose of this application is achieved through the following technical solutions:

[0005] A method for mixing and kneading ultrafine isostatically pressed graphite powder comprises the following steps: a first feeding step of weighing ultrafine powder a and placing it on a receiving tray; a second feeding step of weighing ultrafine powder b and placing it on the receiving tray; a conveying step of conveying the ultrafine powder a and ultrafine powder b on the receiving tray into a kneading device through a conveying pipe; and a kneading step of kneading the powder by the kneading device.

[0006] By adopting the above technical solution, during production, the ultrafine powder a and the ultrafine powder b are weighed and then directly transported to the kneading device through the conveying pipe, thereby improving production efficiency.

[0007] In a preferred example, the present application can be further configured as follows: area a and area b are provided on the receiving tray, both area a and area b are recessed downward in an inverted cone shape, ultrafine powder a is located in area a, and ultrafine powder b is located in area b. The bottom of the receiving tray is connected to the conveying pipe, which is used to convey the mixed powder to the kneading device. The conveying pipe is Y-shaped, and one inlet is connected to the lowest end of area a, and the other inlet is connected to the lowest end of area b.

[0008] By adopting the above technical solution, when the ultrafine powder a and the ultrafine powder b are transported through the Y-shaped transport pipe, the ultrafine powder a and the ultrafine powder b can be mixed in the transport pipe, thereby achieving a better mixing effect.

[0009] In a preferred example, the present application can be further configured as follows: the conveying pipe includes a discharge pipe and a guide pipe, there are two guide pipes and they are symmetrically inclined. Both guide pipes are connected to the discharge pipe, one guide pipe is connected to area a, and the other guide pipe is connected to area b. The discharge pipe is also provided with a storage chamber and a mixing chamber, the storage chamber and the mixing chamber are connected through a valve A, the mixing chamber is located above the storage chamber, the storage chamber and the kneading chamber of the kneading device are connected through a valve B, the discharge pipe is also provided with an air guide hole, a valve C is provided at the air guide hole and is connected to the storage chamber, and the kneading chamber of the kneading device is set to a negative pressure during kneading.

[0010] By adopting the above technical solution, through the negative pressure setting, the mixed powder in the storage chamber can more easily enter the kneading chamber of the kneading device and under the action of the airflow, the powder can be mixed for the second time, and the dispersion effect of the powder entering the kneading chamber is better.

[0011] In a preferred example, the present application can be further configured as follows: during kneading, valve B is opened to allow the mixed powder in the storage chamber to enter the kneading chamber under the action of negative pressure, and then valve B is closed and valve A is opened.

[0012] By adopting the above technical solution, during the feeding process, when valve B is closed, valve A is opened, so that the powder in the mixing chamber can enter the storage chamber.

[0013] In a preferred example, the present application can be further configured as follows: a rotating blade is also provided on the discharge pipe, and the rotating blade is located below the valve B.

[0014] By adopting the above technical solution, the presence of the rotating blades can further enhance the mixing effect and impart centrifugal force to the powder.

[0015] In a preferred example, the present application can be further configured as follows: the discharge pipe also includes a positive pressure chamber, the pressure inside the positive pressure chamber is greater than the standard atmospheric pressure, the positive pressure chamber is connected to the storage chamber through valve C and the air guide hole, and the gas temperature in the positive pressure chamber is the same as the gas temperature in the kneading chamber of the kneading device.

[0016] By adopting the above technical solution, the existence of the positive pressure chamber and the temperature in the positive pressure chamber being the same as the temperature in the kneading chamber can ensure that the temperature in the kneading chamber does not fluctuate much during material feeding.

[0017] In a preferred example, the present application can be further configured as follows: a heating element is provided in the positive pressure chamber, and the heating element is used to heat the gas in the positive pressure chamber. Before valve B opens, the heating element heats the gas in the positive pressure chamber. When the air temperature near the heating element is higher than the gas temperature in the kneading chamber of the kneading device, valve B opens.

[0018] By adopting the above technical solution, during use, there is no need to wait for the overall temperature in the positive pressure chamber to reach the temperature in the kneading chamber. When the air temperature near the heating element is higher than the gas temperature in the kneading chamber, under the action of the air pressure, when the gas in the positive pressure chamber flows toward the kneading chamber, a mixing effect can be achieved during the flow process, thereby reducing the heating time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the pipeline structure of this application.

[0020] Figure numerals: 1, guide tube; 21, mixing chamber; 22, material storage chamber; 23, positive pressure chamber; 31, valve A; 32, valve B; 33, valve C. DETAILED DESCRIPTION

[0021] The present application is further described in detail below with reference to the accompanying drawings.

[0022] Reference Figure 1 , which is a method for mixing and kneading ultrafine isostatically pressed graphite powder disclosed in this application, including the following steps: a feeding step one, weighing the ultrafine powder a and placing it on a receiving tray; a feeding step two, weighing the ultrafine powder b and placing it on the receiving tray; a conveying step, conveying the ultrafine powder a and ultrafine powder b on the receiving tray to a kneading device through a conveying pipe; and a kneading step, kneading the powder by the kneading device.

[0023] The receiving plate is provided with area a and area b, both of which are concave downward in an inverted cone shape. The ultrafine powder a is located in area a, and the ultrafine powder b is located in area b. The bottom of the receiving plate is connected to the conveying pipe, which is used to convey the mixed powder to the kneading device.

[0024] The conveying pipe includes a discharge pipe and a guide pipe 1. There are two guide pipes 1 and they are symmetrically inclined. Both guide pipes 1 are connected to the discharge pipe in a Y-shape. One guide pipe 1 is connected to the lowest end of area a, and the other guide pipe 1 is connected to the lowest end of area b. The discharge pipe is also provided with a storage chamber 22 and a mixing chamber 21. The storage chamber 22 and the mixing chamber 21 are connected through a valve A31. The mixing chamber 21 is located above the storage chamber 22. The storage chamber 22 and the kneading chamber of the kneading device are connected through a valve B32. The discharge pipe is also provided with an air guide hole. A valve C33 is provided at the air guide hole and is connected to the storage chamber 22. The kneading chamber of the kneading device is set to a negative pressure during kneading.

[0025] The feed pipe also includes a positive pressure chamber 23, whose internal pressure is greater than standard atmospheric pressure. The positive pressure chamber 23 is connected to the material storage chamber 22 via a valve C33 and an air guide hole. The temperature of the gas in the positive pressure chamber 23 is the same as that in the kneading chamber of the kneading device. A heater, which can be an electric heating wire, is installed in the positive pressure chamber 23 to heat the gas in the positive pressure chamber 23. Before valve B32 opens, the heater heats the gas in the positive pressure chamber 23. Valve B32 opens when the air temperature near the heater (e.g., 1 cm from the heater, which can be adjusted as needed) exceeds the temperature of the gas in the kneading chamber of the kneading device. The heating duration of the heater can also be timed, so valve B32 opens after a preset time has passed since the heater was activated.

[0026] The discharge pipe is also provided with a rotating blade, which is rotatably connected to the discharge pipe. The rotation axis of the rotating blade coincides with the axis of the discharge pipe. The rotating blade can be located inside the discharge pipe, outside the discharge pipe, or partially inside the discharge pipe.

[0027] Ultrafine powder a and ultrafine powder b enter the mixing chamber 21 through the guide tube 1 and are blocked by valve A31. Then valve A31 and valve C33 are opened. At this time, valve B32 is closed, and the mixed powder enters the storage chamber 22. The gas in the storage chamber 22 enters the positive pressure chamber 23 and is discharged from the air inlet of the positive pressure chamber 23. When the volume of the gas in the storage chamber 22 reaches a preset level, valve A31 and valve C33 are closed, and gas is introduced into the positive pressure chamber 23 through the air inlet of the positive pressure chamber 23 and pressurized to a preset value. Then the air inlet of the positive pressure chamber 23 is sealed. During kneading, valves B32 and valve C33 are opened to allow the mixed powder in the storage chamber 22 to enter the kneading chamber under the action of negative pressure, thereby realizing the transportation of the mixed powder.

[0028] The implementation principle of this embodiment is: during use, the powder materials are mixed and the materials are added multiple times during the kneading process, so as to achieve a better kneading effect.

[0029] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for mixing and kneading ultrafine isostatically pressed graphite powder, characterized in that: The method comprises the following steps: a first unloading step, weighing the ultrafine powder a and placing it on a receiving tray; a second unloading step, weighing the ultrafine powder b and placing it on the receiving tray; a conveying step, conveying the ultrafine powder a and the ultrafine powder b on the receiving tray to a kneading device through a conveying pipe; and a kneading step, kneading the powder by the kneading device.

2. The method for mixing and kneading ultrafine isostatically pressed graphite powder according to claim 1, wherein: The receiving tray is provided with area a and area b, both of which are concave downward in an inverted cone shape. The ultrafine powder a is located in area a, and the ultrafine powder b is located in area b. The bottom of the receiving tray is connected to the conveying pipe, which is used to convey the mixed powder to the kneading device. The conveying pipe is Y-shaped, and one inlet is connected to the lowest end of area a, and the other inlet is connected to the lowest end of area b.

3. The method for mixing and kneading ultrafine isostatically pressed graphite powder according to claim 2, wherein: The conveying pipe comprises a feeding pipe and a guide pipe (1). There are two guide pipes (1) which are symmetrically inclined. Both guide pipes (1) are connected to the feeding pipe. One guide pipe (1) is connected to area a, and the other guide pipe (1) is connected to area b. The feeding pipe is further provided with a material storage chamber (22) and a mixing chamber (21). The material storage chamber (22) and the mixing chamber (21) are connected via a valve A (31). The mixing chamber (21) is located above the material storage chamber (22). The material storage chamber (22) and the kneading chamber of the kneading device are connected via a valve B (32). The feeding pipe is further provided with an air guide hole. A valve C (33) is provided at the air guide hole and is connected to the material storage chamber (22). The kneading chamber of the kneading device is set to a negative pressure during kneading.

4. The method for mixing and kneading ultrafine isostatically pressed graphite powder according to claim 3, wherein: During kneading, valve B (32) is opened to allow the mixed powder in the storage chamber (22) to enter the kneading chamber under the action of negative pressure, and then valve B (32) is closed and valve A (31) is opened.

5. The method for mixing and kneading ultrafine isostatically pressed graphite powder according to claim 4, wherein: The discharge pipe is also provided with a rotating blade, which is located below the valve B (32).

6. The method for mixing and kneading ultrafine isostatically pressed graphite powder according to claim 4, wherein: The feed pipe further comprises a positive pressure chamber (23), the pressure in the positive pressure chamber (23) being greater than the standard atmospheric pressure, the positive pressure chamber (23) being connected to the material storage chamber (22) via a valve C (33) and an air guide hole, and the gas temperature in the positive pressure chamber (23) being the same as the gas temperature in the kneading chamber of the kneading device.

7. The method for mixing and kneading ultrafine isostatically pressed graphite powder according to claim 6, wherein: A heating element is provided in the positive pressure chamber (23) for heating the gas in the positive pressure chamber (23). Before the valve B (32) is opened, the heating element heats the gas in the positive pressure chamber (23). When the air temperature near the heating element is higher than the gas temperature in the kneading chamber of the kneading device, the valve B (32) opens.

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