A high-energy ball milling device based on plasma discharge and electromagnetic heating

Abstract

The utility model relates to powder metallurgy technical field, concretely is a kind of high-energy ball milling device based on plasma discharge and electromagnetic heating, including cabinet, the front end surface of cabinet is equipped with vacuum cavity and the closed door for plugging vacuum cavity, the inner bottom wall of vacuum cavity is equipped with two symmetrical supports, the surface of two supports is equipped with knurl wheel and electromagnetic induction module respectively, one end of one knurl wheel is connected with drive assembly, and the inner chamber of vacuum cavity is equipped with ball mill jar for placing on two knurl wheels, the inner chamber of ball mill jar is equipped with electrode stick and grinding ball, one end of electrode stick penetrates in one end of ball mill jar and is connected with one pole of plasma power supply.The utility model carries out simultaneous auxiliary processing to same kind of material in same space by ball milling, plasma and electromagnetic induction heating technology, greatly shorten the processing time of material, improve processing efficiency, and processing effect is better, beneficial to mass production, and application prospect is broad.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy technology, specifically to a high-energy ball milling device based on plasma discharge and electromagnetic heating. Background Technology

[0002] High-energy ball milling is one of the most commonly used techniques for preparing alloy powders in the preparation of nano- and micro-materials and mechanical alloying. It generally uses the rotation or vibration of a high-energy ball mill to refine metal or alloy powders to the nano- and micro-scale. That is, two or more powders are put into the ball mill jar of a high-energy ball mill at the same time for ball milling. The powder particles are rolled, pressed, crushed, and pressed again in a repeated process (i.e., repeated cold welding-crushing-cold welding). This process can continuously refine the powder grains and particle size, and finally obtain nano- and micro-scale ultrafine alloy powders with uniform microstructure and composition distribution.

[0003] Typically, the high-energy ball mills described above simply use the mechanical energy of the grinding balls within the rotating or vibrating grinding jar to process powder. This means that only the mechanical stress field causes the powder to react, making it difficult to obtain powder with a particle size at the nanometer level. Consequently, a second-stage processing is required, which necessitates the purchase of two different pieces of equipment for production, resulting in higher costs. Furthermore, the second-stage processing requires material transfer, which is time-consuming and labor-intensive, leading to a long processing cycle and low efficiency. Utility Model Content

[0004] This invention provides a high-energy ball milling device based on plasma discharge and electromagnetic heating to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A high-energy ball milling device based on plasma discharge and electromagnetic heating includes a cabinet. A vacuum chamber and a sealing door for sealing the vacuum chamber are provided on the front end face of the cabinet. Two symmetrically arranged supports are installed on the inner bottom wall of the vacuum chamber. Knurled wheels and electromagnetic induction modules are respectively provided on the surfaces of the two supports. One end of one of the knurled wheels is connected to a drive assembly. A ball milling jar is provided inside the vacuum chamber for placing on the two knurled wheels. An electrode rod and grinding balls are provided inside the ball milling jar. One end of the electrode rod passes through one end of the ball milling jar and is connected to one pole of a plasma power supply. The ball milling jar is connected to the other pole of the plasma power supply. A vacuum valve for drawing negative pressure or introducing gas is provided on the inner wall of the vacuum chamber. Limiting components are respectively provided at the front and rear end faces of the ball milling jar.

[0006] Preferably, the ball mill jar includes a jar body and a jar mouth component made of stainless steel. The jar mouth component is fixedly installed at the jar mouth end of the jar body by bolts, and a through opening is provided on the surface of the jar mouth component. One end of the through opening is conical from the outside to the inside, and an overflow prevention section is provided between the inner wall of the through opening and the inner wall of the jar body.

[0007] Preferably, the two supports are fixedly installed on the inner bottom wall of the vacuum chamber by bolts, and the surfaces of the two supports close to the ball mill jar are arc-shaped, with the knurling wheel and the electromagnetic induction module respectively disposed on the arc-shaped surfaces.

[0008] Preferably, a rotating groove and an arc-shaped groove are respectively formed on the two arc-shaped surfaces, the knurling wheel is movably installed in the rotating groove, and the electromagnetic induction module is distributed in the arc-shaped groove and used to heat the ball mill jar.

[0009] Preferably, the surface of the closed door is provided with a first sealing strip and a second sealing strip, the periphery of the port of the vacuum cavity is provided with a sealing groove, the sealing groove corresponds to and is adapted to the first sealing strip, and the second sealing strip is provided on the inner wall of the port of the vacuum cavity.

[0010] Preferably, the limiting component includes a fixing seat that is fixedly installed on the bottom wall of the vacuum chamber by bolts, and ball bearings are movably embedded on the surface of the fixing seat, with the front and rear end faces of the ball mill jar respectively abutting the corresponding ball bearings.

[0011] Preferably, the drive assembly includes a motor and a coupling, wherein the output end of the motor is connected to the roller of one of the knurling wheels via the coupling.

[0012] Preferably, the rear end face of the cabinet has an equipment cavity, and the motor and plasma power supply are respectively installed in the equipment cavity.

[0013] Preferably, the outer surface of the electrode rod is provided with an insulating section, the insulating section being located where the electrode rod penetrates the grinding jar, and the electrode rod is insulated from the grinding jar through the insulating section.

[0014] Preferably, the surface of the closed door has a through-hole for observation, and an observation window is provided inside the through-hole.

[0015] By adopting the above technical solution, the beneficial effects achieved by this utility model are as follows: In this invention, ball milling, plasma, and electromagnetic induction heating technologies are designed into a single vacuum chamber, ensuring that the three technologies can simultaneously assist in the processing of the same material within the same space. This significantly shortens the material processing time and improves processing efficiency. Furthermore, compared to the conventional method of using the mechanical energy of grinding balls to process powder, this invention is not only more efficient but also produces better results, making it suitable for mass production and with broad application prospects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the opening structure of the closed door of this utility model.

[0018] Figure 3 This is a schematic diagram of the right-side cross-sectional structure of this utility model.

[0019] Figure 4 for Figure 3 A magnified structural diagram at point A in the diagram.

[0020] Figure 5 This is a partial cross-sectional view of the cabinet structure of this utility model.

[0021] In the diagram: 1. Cabinet; 2. Vacuum chamber; 3. Sealing door; 31. First sealing strip; 32. Second sealing strip; 33. Observation window; 4. Support; 41. Rotating groove; 42. Arc groove; 5. Knurling wheel; 6. Electromagnetic induction module; 7. Grinding jar; 71. Jar body; 72. Jar opening; 73. Exit; 8. Electrode rod; 9. Grinding ball; 10. Plasma power supply; 11. Vacuum valve; 12. Drive assembly; 121. Motor; 122. Coupling; 13. Limiting component; 131. Fixing base; 132. Ball bearing; 14. Sealing groove; 15. Equipment cavity; 16. Insulation section. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0024] like Figures 1-5 As shown, this utility model provides a high-energy ball milling device based on plasma discharge and electromagnetic heating, including a cabinet 1. A vacuum chamber 2 and a sealing door 3 for sealing the vacuum chamber 2 are provided on the front end face of the cabinet 1. Two symmetrically arranged supports 4 are installed on the inner bottom wall of the vacuum chamber 2. Knurling wheels 5 and electromagnetic induction modules 6 are respectively provided on the surfaces of the two supports 4. One end of one of the knurling wheels 5 is connected to a drive assembly 12. The inner cavity of the vacuum chamber 2 is provided with a grinding jar 7 for placing on the two knurling wheels 5. An electrode rod 8 and grinding balls 9 are provided inside the grinding jar 7. One end of the electrode rod 8 penetrates one end of the grinding jar 7 and is connected to the plasma discharge. One pole of the plasma power supply 10 is connected, and the ball milling jar 7 is connected to the other pole of the plasma power supply 10. Here, one end of the electrode rod 8 can be connected to the positive pole of the plasma power supply 10, and the negative pole of the plasma power supply 10 is connected to the ball milling jar 7. The inner wall of the vacuum chamber 2 is provided with a vacuum valve 11 for drawing negative pressure or introducing gas. The vacuum valve 11 can be used to draw negative pressure into the vacuum chamber 2, or the discharge gas medium argon, nitrogen, ammonia or organic gas (such as methane) can be introduced into the vacuum chamber 2 through the vacuum valve 11 to achieve the ball milling atmosphere in the ball milling jar 7. Limiting components 13 are respectively provided at the front and rear end faces of the ball milling jar 7.

[0025] The plasma power supply 10 uses a high-frequency power supply, which can provide high-frequency, high-voltage alternating current. The electrode rod 8 is provided with a dielectric barrier layer on the outside. This dielectric barrier layer is made of insulating material. Dielectric barrier discharge is a common method of cold field plasma. It involves filling the space between two discharge electrodes with a certain working gas and adding an insulating dielectric. When a sufficiently high alternating voltage is applied between the two electrodes, the gas between the electrodes will break down and generate a discharge. At the same time, dielectric barrier discharge can get rid of the vacuum system required for low-pressure discharge plasma. Therefore, introducing the dielectric barrier discharge structure into the gas-controlled 7 can realize the organic combination of plasma field and mechanical ball milling. Furthermore, the dielectric barrier layer can suppress the unlimited increase of micro-discharge, so that the dielectric barrier discharge will not turn into spark discharge or arc discharge, avoiding the burn damage of the ball milling system by thermal plasma. This method is known and mastered by those skilled in the art. This article aims to describe it simply and will not elaborate on it in detail.

[0026] The grinding jar 7 and the grinding balls 9 are made of stainless steel, including but not limited to 310 stainless steel alloy material with excellent high temperature resistance and corrosion resistance.

[0027] As a further step, in combination Figure 3 and Figure 4 As shown, the ball mill jar 7 includes a jar body 71 made of stainless steel and a jar mouth part 72. The outer surface of the jar body 71 is provided with a knurled texture (not shown in the figure). The jar mouth part 72 is fixedly installed at the jar mouth end of the jar body 71 by bolts, and a through opening 73 is provided on the surface of the jar mouth part 72. One end of the through opening 73 is set in a conical shape from the outside to the inside, and an anti-overflow section is provided between the inner wall of the through opening 73 and the inner wall of the jar body 71. With the help of the anti-overflow section design, the material inside the jar body 71 can be prevented from leaking out.

[0028] Furthermore, by setting a knurled texture on the outer surface of the grinding jar 71, the contact area and roughness can be effectively increased when the grinding jar 7 contacts the knurling wheel 5, which significantly improves the friction and reduces the possibility of slippage when the knurling wheel 5 drives the grinding jar 7. This ensures a tighter engagement between the grinding jar 7 and the knurling wheel 5 and higher driving efficiency. It is worth noting that the knurling tooth shape, spacing, and depth on the outer surface of the grinding jar 7 match the knurling tooth shape, spacing, and depth of the knurling wheel 5, which can achieve smooth and reliable operation.

[0029] As a further step, the inner wall of the tank 71 is provided with multiple baffles, which are evenly distributed along the circumference of the inner wall of the tank 71.

[0030] As a further step, in combination Figure 3 , Figure 4 and Figure 5 As shown, two supports 4 are fixedly installed on the inner bottom wall of the vacuum chamber 2 by bolts, and the surfaces of the two supports 4 close to the ball mill jar 7 are arc-shaped. The knurling wheel 5 and the electromagnetic induction module 6 are respectively set on the arc-shaped surfaces. The drive assembly 12 includes a motor 121 and a coupling 122. The output end of the motor 121 is connected to the roller of one of the knurling wheels 5 through the coupling 122.

[0031] Furthermore, the length of the support 4 and the knurling wheel 5 is greater than the length of the grinding jar 7, and the spatial distribution of the electromagnetic induction module 6 is greater than the length of the grinding jar 7. In this way, by utilizing the cooperation between the knurling wheel 5 and the grinding jar 7, the motor 121 can drive the jar 71 to rotate through the knurling wheel 5 when it is working, which is beneficial for the grinding balls 9 to uniformly grind the material.

[0032] As a further step, in combination Figure 4 and Figure 5 As shown, a rotating groove 41 and an arc groove 42 are respectively opened on the two arc surfaces. The knurling wheel 5 is movably installed in the rotating groove 41, and the electromagnetic induction module 6 is distributed in the arc groove 42 and is used to heat the ball mill jar 7.

[0033] Furthermore, the electromagnetic induction module 6 employs an electromagnetic coil distribution, wherein the distributed electromagnetic coils are arranged in an arc shape, more comprehensively close to the ball mill jar 7, ensuring that the electromagnetic induction module 6 heats the ball mill jar 7 uniformly, realizing both ball milling and heat treatment of the material, thereby improving the material processing efficiency.

[0034] As a further step, in combination Figure 2 and Figure 3 As shown, the surface of the closed door 3 is provided with a first sealing strip 31 and a second sealing strip 32. A sealing groove 14 is provided around the port of the vacuum chamber 2. The sealing groove 14 corresponds to and is adapted to the first sealing strip 31. The second sealing strip 32 is provided on the inner wall of the port of the vacuum chamber 2.

[0035] Furthermore, by utilizing the design of the first sealing strip 31, the second sealing strip 32, and the sealing groove 14, the sealing of the vacuum chamber 2 port can be guaranteed after the closed door 3 is closed, which is conducive to the vacuum chamber 2 being evacuated to negative pressure. At the same time, the closed door 3 is provided with a locking handle, and the front face of the cabinet 1 is provided with a lock seat for matching the locking handle. In addition, the cabinet 1 is also provided with control buttons for controlling the entire device and a display screen for displaying a series of data. This structural technology is well known and applied by those skilled in the art, and will not be described in detail here.

[0036] The bottom four corners of cabinet 1 are also equipped with height-adjustable support feet to ensure the stability of cabinet 1 after it is placed, which is conducive to the stable operation of the device.

[0037] As a further step, in combination Figure 3 and Figure 4 As shown, the limiting component 13 includes a fixed seat 131 that is fixedly installed on the bottom wall of the vacuum chamber 2 by bolts. Ball bearings 132 are movably embedded on the surface of the fixed seat 131, and the front and rear end faces of the ball mill jar 7 are respectively attached to the corresponding ball bearings 132.

[0038] Furthermore, when using the two limiting components 13, the inner limiting component 13 can be installed first with bolts. After the grinding jar 7 is installed and its rear end face abuts against the ball bearing 132, the outer limiting component 13 is then installed to ensure that the front and rear end faces of the grinding jar 7 abut against the corresponding ball bearing 132, thereby limiting the grinding jar 7 and preventing it from shifting forward or backward. At the same time, when the grinding jar 7 rotates, the ball bearing 132 is also movable and embedded on the surface of the fixed seat 131, which allows the ball bearing 132 to rotate, so that the grinding jar 7 can rotate while being limited.

[0039] As a further step, the inner bottom wall of the vacuum chamber 2 is provided with multiple fixing holes for mounting the fixing seat 131, and the multiple fixing holes are arranged in a row, so that the installation position of the limiting component 13 can be adjusted at will, ensuring that it can be used with ball milling jars 7 of different sizes.

[0040] As a further step, an equipment cavity 15 is provided on the rear end face of the cabinet 1. The motor 121 and the plasma power supply 10 are respectively installed in the equipment cavity 15. The equipment cavity 15 is also provided with a device for supplying power to the electromagnetic induction module 6, so as to ensure that the material of the ball mill jar 7 can be heated by the power supply device and the electromagnetic induction module 6, thereby improving the processing efficiency and significantly shortening the time.

[0041] As a further step, an insulating section 16 is provided on the outer surface of the electrode rod 8. The insulating section 16 is located where the electrode rod 8 penetrates the ball milling jar 7, and the electrode rod 8 is insulated from the ball milling jar 7 through the insulating section 16.

[0042] As a further step, an observation opening is provided through the surface of the closed door 3, and an observation window 33 is provided inside the observation opening, which allows the staff to observe the material processing in the ball mill jar 7 through the observation window 33.

[0043] The device of this utility model is operated through the following steps: 1) After the jar body 71 and the jar opening part 72 are installed with bolts, the ball mill jar 7 is placed on the surface of the knurling wheel 5 inside the vacuum chamber 2. At the same time, the ball mill jar 7 and the electrode rod 8 are connected to the two poles of the plasma power supply 10 respectively. The conductive core of the electrode rod 8 is connected to the positive pole of the plasma power supply 10, and the jar body 71 of the ball mill jar 7 is connected to the negative pole of the plasma power supply 10. 2) After the ball mill jar 7 is placed, install and fix the outer limiting component 13 to ensure that the inner and outer limiting components 13 respectively abut against the front and rear end faces of the ball mill jar 7. 3) The grinding balls 9 and the powder to be processed are respectively loaded into the ball mill jar 7. During this process, the electrode rod 8 with the dielectric barrier layer is located at the center of the ball mill jar 7. 4) Close the sealed door 3 by locking the handle and the lock seat, so that the design of the first sealing strip 31, the second sealing strip 32 and the sealing groove 14 can ensure the airtightness of the vacuum chamber 2. Then, use an external known device in conjunction with the vacuum valve 11 to evacuate the sealed vacuum chamber 2 to a negative pressure. Then, the staff can use the vacuum valve 11 to introduce the required discharge gas medium, such as argon, nitrogen, argon, methane or oxygen, as needed. 5) Connect the power supplies of plasma power supply 10 and electromagnetic induction module 6 respectively, so that electromagnetic induction module 6 can heat the ball milling jar 7, which promotes faster material heating and effectively improves material processing efficiency. Adjust the discharge parameters of plasma power supply 10 according to the discharge gas medium and its pressure to ensure that an electric field is formed inside the ball milling jar 7. During this period, drive component 12 is started, so that after drive component 12 works, it drives ball milling jar 7 to rotate via knurling wheel 5. Thus, as ball milling jar 7 and partition rotate, the relative position of grinding ball 9 and electrode rod 8 is changed, and corona discharge plasma-assisted high-energy ball milling is performed.

[0044] This invention integrates ball milling, plasma, and electromagnetic induction heating technologies within a single vacuum chamber 2, ensuring that these three technologies can simultaneously process the same material in the same space. This significantly reduces material processing time and improves processing efficiency. Furthermore, compared to conventional methods that utilize the mechanical energy of grinding balls 9 to process powders, this invention is not only more efficient but also produces better results, making it suitable for mass production. It has broad application prospects and can effectively reduce the cost for manufacturers to purchase multiple sets of equipment.

[0045] In this invention, the term "plural" refers to two or more items unless otherwise expressly defined. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] It should be noted that when a component is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0047] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-energy ball milling device based on plasma discharge and electromagnetic heating, characterized in that, The system includes a cabinet (1), a vacuum chamber (2) and a sealing door (3) for sealing the vacuum chamber (2) on the front end face of the cabinet (1). Two symmetrically arranged supports (4) are installed on the inner bottom wall of the vacuum chamber (2). Knurled wheels (5) and electromagnetic induction modules (6) are respectively provided on the surfaces of the two supports (4). One end of one of the knurled wheels (5) is connected to a drive assembly (12), and the inner cavity of the vacuum chamber (2) is provided for placing the two knurled wheels (5). The ball milling jar (7) is provided with an electrode rod (8) and a grinding ball (9) in its inner cavity. One end of the electrode rod (8) passes through one end of the ball milling jar (7) and is connected to one pole of the plasma power supply (10). The ball milling jar (7) is connected to the other pole of the plasma power supply (10). The inner wall of the vacuum chamber (2) is provided with a vacuum valve (11) for drawing negative pressure or introducing gas. Limiting components (13) are respectively provided at the front and rear end faces of the ball milling jar (7).

2. The high-energy ball milling device based on plasma discharge and electromagnetic heating according to claim 1, characterized in that, The ball mill jar (7) includes a jar body (71) made of stainless steel and a jar mouth part (72). The jar mouth part (72) is fixedly installed at the jar mouth end of the jar body (71) by bolts, and a through opening (73) is provided on the surface of the jar mouth part (72). One end of the through opening (73) is set in a conical shape from the outside to the inside, and an overflow prevention section is provided between the inner wall of the through opening (73) and the inner wall of the jar body (71).

3. The high-energy ball milling device based on plasma discharge and electromagnetic heating according to claim 1, characterized in that, The two supports (4) are fixedly installed on the inner bottom wall of the vacuum chamber (2) by bolts, and the surfaces of the two supports (4) close to the ball mill jar (7) are arc-shaped. The knurling wheel (5) and the electromagnetic induction module (6) are respectively set on the arc-shaped surfaces.

4. A high-energy ball milling device based on plasma discharge and electromagnetic heating according to claim 3, characterized in that, Rotating groove (41) and arc groove (42) are respectively opened on the two arc surfaces. The knurling wheel (5) is movably installed in the rotating groove (41). The electromagnetic induction module (6) is distributed in the arc groove (42) and is used to heat the ball mill jar (7).

5. A high-energy ball milling device based on plasma discharge and electromagnetic heating according to claim 1, characterized in that, The surface of the closed door (3) is provided with a first sealing strip (31) and a second sealing strip (32). A sealing groove (14) is provided around the port of the vacuum cavity (2). The sealing groove (14) corresponds to and is adapted to the first sealing strip (31). The second sealing strip (32) is provided on the inner wall of the port of the vacuum cavity (2).

6. A high-energy ball milling device based on plasma discharge and electromagnetic heating according to claim 1, characterized in that, The limiting component (13) includes a fixing seat (131) that is fixedly installed on the bottom wall of the vacuum cavity (2) by bolts. The surface of the fixing seat (131) is movably embedded with balls (132), and the front and rear ends of the ball mill jar (7) are respectively attached to the corresponding balls (132).

7. A high-energy ball milling device based on plasma discharge and electromagnetic heating according to claim 1, characterized in that, The drive assembly (12) includes a motor (121) and a coupling (122), the output end of which is connected to the roller of one of the knurling wheels (5) via the coupling (122).

8. A high-energy ball milling device based on plasma discharge and electromagnetic heating according to claim 7, characterized in that, The rear end face of the cabinet (1) is provided with an equipment cavity (15), and the motor (121) and plasma power supply (10) are respectively arranged in the equipment cavity (15).

9. A high-energy ball milling device based on plasma discharge and electromagnetic heating according to claim 1, characterized in that, An insulating section (16) is provided on the outer surface of the electrode rod (8). The insulating section (16) is located where the electrode rod (8) passes through the ball milling jar (7), and the electrode rod (8) is insulated from the ball milling jar (7) through the insulating section (16).

10. A high-energy ball milling device based on plasma discharge and electromagnetic heating according to claim 1, characterized in that, An observation opening is provided through the surface of the closed door (3), and an observation window (33) is provided inside the observation opening.

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