Mixing and kneading method for ultrafine powder isostatic pressing graphite powder

Abstract

The application relates to a mixing and kneading method for superfine powder isostatic pressing graphite powder, which comprises the following steps: a weighing and placing step one, weighing superfine powder a and placing the superfine powder a on a receiving tray; a weighing and placing step two, weighing superfine powder b and placing the superfine powder b on the receiving tray; a conveying step, conveying the superfine powder a and the superfine powder b on the receiving tray into a kneading device through a conveying pipe; and a kneading step, wherein the kneading device kneads the powder. The application has the advantage of high efficiency.

Description

Technical Field

[0001] This 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 Technology

[0002] To improve the performance of isostatic graphite, some existing preparation methods utilize ultrafine powders. For example, CN112408985B discloses a method for preparing high-performance fine isostatic graphite, which involves mixing ultrafine powder a and ultrafine powder b to prepare isostatic graphite. However, the existing mixing method involves kneading the two powders after mixing, which is inefficient. Summary of the Invention

[0003] To address the shortcomings of existing technologies, one of the objectives 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 objective of this application is achieved through the following technical solution:

[0005] A method for mixing and kneading ultrafine isostatically pressed graphite powder includes the following steps: a feeding step one, weighing ultrafine powder a and placing it on a receiving tray; a feeding step two, weighing ultrafine powder b and placing it on a receiving tray; a conveying step, conveying ultrafine powder a and ultrafine powder b on the receiving tray to a kneading device through a conveying pipe; and a kneading step, in which the kneading device kneads the powder.

[0006] By adopting the above technical solution, in the production process, after ultrafine powder a and ultrafine powder b are weighed, they are directly transported to the mixing device through the conveying pipe, thereby improving production efficiency.

[0007] In a preferred embodiment, this application can be further configured as follows: the receiving plate is provided with region a and region b, both regions a and b are concave downwards in the shape of an inverted cone, ultrafine powder a is located in region a and ultrafine powder b is located in region b, and the receiving plate is connected to the conveying pipe below, the conveying pipe 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 region a and the other inlet is connected to the lowest end of region b.

[0008] By adopting the above technical solution, when ultrafine powder a and ultrafine powder b are conveyed through a Y-shaped conveying pipe, ultrafine powder a and ultrafine powder b can be mixed inside the conveying pipe, thereby improving the mixing effect.

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

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

[0011] In a preferred embodiment, this application can be further configured such that: during kneading, valve B is opened, allowing the mixed powder in the storage chamber to enter the kneading chamber under negative pressure; 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, allowing the powder in the mixing chamber to enter the storage chamber.

[0013] In a preferred embodiment, this application may be further configured such that the feed pipe is also provided with a rotating blade, which is located below valve B.

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

[0015] In a preferred embodiment, the present application may be further configured such that: the feed 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 air guide hole, and the gas temperature inside the positive pressure chamber is the same as the gas temperature inside the kneading chamber of the kneading device.

[0016] By adopting the above technical solution, the existence of the positive pressure chamber and the fact that the temperature inside the positive pressure chamber is the same as the temperature inside the kneading chamber can ensure that the temperature fluctuation inside the kneading chamber is not large during material feeding.

[0017] In a preferred embodiment, this application may be further configured such that: a heating element is provided in the positive pressure chamber, the heating element is used to heat the gas in the positive pressure chamber, the heating element heats the gas in the positive pressure chamber before valve B is opened, and valve B is opened when the air temperature near the heating element is greater than the gas temperature in the kneading chamber of the kneading device.

[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 greater than the gas temperature in the kneading chamber, under the action of air pressure, when the gas in the positive pressure chamber flows towards the kneading chamber, it can achieve a mixing effect during the flow process, thereby reducing the heating time required. Attached Figure Description

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

[0020] Reference numerals: 1. Guide tube; 21. Mixing chamber; 22. Storage chamber; 23. Positive pressure chamber; 31. Valve A; 32. Valve B; 33. Valve C. Detailed Implementation

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

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

[0023] The receiving plate has regions a and b, both of which are concave and inverted cone-shaped. Ultrafine powder a is located in region a and ultrafine powder b is located in region b. The receiving plate is connected to the conveying pipe below, which is used to convey the mixed powder to the kneading device.

[0024] The conveying pipe includes 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 and are arranged in a Y shape. One guide pipe 1 is connected to the lowest end of region a, and the other guide pipe 1 is connected to the lowest end of region b. The feeding 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 by a valve A31. The mixing chamber 21 is located above the storage chamber 22. The storage chamber 22 and the mixing chamber of the kneading device are connected by a valve B32. The feeding 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 mixing chamber of the kneading device is set with negative pressure during kneading.

[0025] The feeding pipe also includes a positive pressure chamber 23. The pressure inside the positive pressure chamber 23 is greater than the standard atmospheric pressure. The positive pressure chamber 23 is connected to the storage chamber 22 through valve C33 and a vent. The gas temperature inside the positive pressure chamber 23 is the same as the gas temperature inside the kneading chamber of the mixing device. A heating element, which can be an electric heating wire, is installed inside the positive pressure chamber 23 to heat the gas inside. Before valve B32 opens, the heating element heats the gas inside the positive pressure chamber 23. When the air temperature near the heating element (e.g., 1 cm away from the heating element, which can be set as needed) is greater than the gas temperature inside the kneading chamber of the mixing device, valve B32 opens. The heating time of the heating element can also be timed. After the heating element starts and a preset time has elapsed, valve B32 opens.

[0026] The feeding pipe is also equipped with a rotating blade, which is rotatably connected to the feeding pipe. The rotation axis of the rotating blade coincides with the axis of the feeding pipe. The rotating blade can be located inside the feeding pipe, outside the feeding pipe, or partially inside the feeding 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 valves A31 and C33 are opened, while valve B32 is closed. The mixed powder enters the storage chamber 22, and 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 in the storage chamber 22 reaches the preset level, valves A31 and C33 are closed, and gas is introduced into the positive pressure chamber 23 through the air inlet and pressurized to the preset value. Then the air inlet of the positive pressure chamber 23 is sealed. During kneading, valves B32 and C33 are opened, so that the mixed powder in the storage chamber 22 enters the kneading chamber under the action of negative pressure, thereby realizing the conveying of the mixed powder.

[0028] The implementation principle of this embodiment is as follows: during use, the powder is mixed and the mixing effect is improved by adding the powder multiple times during the kneading process.

[0029] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for mixing and kneading ultrafine isostatically pressed graphite powder, characterized in that: The process includes the following steps: Step 1: Weighing and placing ultrafine powder a onto a receiving tray; Step 2: Weighing and placing ultrafine powder b onto a receiving tray; Step 3: Conveying ultrafine powder a and ultrafine powder b from the receiving tray into a mixing device via a conveying pipe; Step 4: The mixing device mixes the powders. The receiving tray has two regions, a and b, both concave in shape. Ultrafine powder a is located in region a, and ultrafine powder b is located in region b. The conveying pipe is connected to the bottom of the receiving tray and is used to transport the mixed powder to the mixing device. The conveying pipe is Y-shaped, with one inlet connected to the lowest point of region a and the other inlet connected to the lowest point of region b. The lowest end is connected; the conveying pipe includes a discharge pipe and a guide pipe (1). The discharge pipe includes a positive pressure chamber (23). There are two guide pipes (1) that are symmetrically inclined. Both guide pipes (1) are connected to the discharge pipe. One guide pipe (1) is connected to area a, and the other guide pipe (1) is connected to 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 valve A (31). The mixing chamber (21) is located above the storage chamber (22). The storage chamber (22) and the mixing chamber of the mixing device are connected through valve B (32). The discharge pipe is also provided with an air guide hole. A valve is provided at the air guide hole. C(33) is connected to the storage chamber (22). The mixing chamber of the mixing device is set under negative pressure during mixing. Ultrafine powder a and ultrafine powder b enter the mixing chamber (21) through the guide tube (1) and are blocked by valve A(31). Then valves A(31) and C(33) are opened. At this time, valve B(32) is closed. 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). During mixing, valve B(32) is opened so that the mixed powder in the storage chamber (22) enters the mixing chamber under negative pressure. Then valve B(32) is closed and valve C(33) is opened. Door A (31); The feed pipe is also equipped with a rotating blade, which is located below valve B (32); The pressure inside the positive pressure chamber (23) is greater than the standard atmospheric pressure. The positive pressure chamber (23) is connected to the storage chamber (22) through valve C (33) and the air guide hole. The gas temperature inside the positive pressure chamber (23) is the same as the gas temperature inside the kneading chamber of the mixing device. The positive pressure chamber (23) is equipped with a heating element, which is used to heat the gas inside the positive pressure chamber (23). Before valve B (32) is opened, the heating element heats the gas inside the positive pressure chamber (23). When the air temperature near the heating element is greater than the gas temperature inside the kneading chamber of the mixing device, valve B (32) is opened.

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