A ball mill for aluminum powder

Abstract

This utility model provides a ball mill for aluminum powder. The ball mill includes a coarse grinding jar, a fine grinding jar, and a disc screen. The disc screen is fixed between the coarse and fine grinding jars. The disc screen includes a body and a pressing part. The body has arc-shaped screen holes. Inside the body, one side of the arc-shaped screen holes has a receiving space communicating with the arc-shaped screen holes. The pressing part is movably installed in the receiving space and is located on the same plane as the arc-shaped screen holes. The pressing part is configured to move between the receiving space and the arc-shaped screen holes, pushing the blocked material. The side of the pressing part and the arc-shaped screen holes away from the receiving space form a crushing jaw for crushing the blocked material. The movable design of the pressing part can actively clear the blockage in the screen holes, pushing it away from the screen hole area and restoring the screening channel. Secondly, for slightly larger particles stuck in the screen holes, the crushing jaw can directly crush them. Therefore, the ball mill provided by this application can clear screen blockage.

Description

Technical Field

[0001] This application relates to the field of industrial production equipment, and more specifically, to a ball mill for aluminum powder. Background Technology

[0002] Ball mills used for aluminum powder generally employ a two-tank structure of "coarse grinding jar - grading screen - fine grinding jar," with particle size controlled by the screen. However, cold-welded aluminum lumps, unbroken aluminum ingot fragments, and other hard agglomerates generated during coarse grinding easily bridge and wed into the screen holes. Existing methods such as high-pressure air blowing, ultrasonic vibration, rubber ball impact, or manual material handling all fail to break high-hardness aluminum blocks online due to insufficient impact force or the need for shutdown. Utility Model Content

[0003] This application provides a ball mill for aluminum powder that can clear screen blockage.

[0004] Specifically, this application is implemented through the following technical solution:

[0005] This application provides a ball mill for aluminum powder, comprising:

[0006] coarse grinding jar;

[0007] Fine grinding jar;

[0008] A disc screen is fixed between the coarse grinding jar and the fine grinding jar. The disc screen includes a body and a pressing part. The body has an arc-shaped screen hole. Inside the body, a receiving space communicating with the arc-shaped screen hole is provided on one side. The pressing part is movably installed in the receiving space and is located on the same plane as the arc-shaped screen hole.

[0009] The crushing section is configured to move between the receiving space and the arc-shaped screen hole, and can push the blocked material. The crushing section and the side of the arc-shaped screen hole away from the receiving space form crushing jaws for crushing the blocked material.

[0010] Optionally, the body includes a plurality of circumferentially distributed fan-shaped screen hole regions, each of the fan-shaped screen hole regions including a plurality of radially distributed arc-shaped screen holes;

[0011] The pressing section includes a pressing disc and multiple rotary arms. The multiple rotary arms are connected to the circumference of the pressing disc, and the pressing disc is rotatably connected to the main body. The multiple rotary arms correspond one-to-one with the multiple fan-shaped sieve hole areas. The rotary arms are housed in the same fan-shaped sieve hole area, and multiple accommodating spaces formed by multiple interconnected accommodating spaces opened on the same side of the multiple arc-shaped sieve holes are formed.

[0012] Optionally, the rotary grinding arm has multiple grinding heads protruding from one side toward the fan-shaped screen area, and the multiple grinding heads correspond one-to-one with the multiple arc-shaped screen holes located in the same fan-shaped screen area.

[0013] Optionally, the rolling head is an alloy steel head.

[0014] The rolling head is a wedge-shaped cutter head.

[0015] Optionally, a pad, which is made of steel plate, is fixedly provided on the side of the arc-shaped sieve hole away from the receiving space.

[0016] Optionally, the compaction unit further includes a rotating motor, which is disposed on the axis of the compaction disc and is connected to the compaction disc in a transmission manner to drive the compaction disc to rotate.

[0017] Optionally, the ball mill for aluminum powder further includes a cleaning assembly disposed inside the fine grinding jar, the fine grinding jar rotating relative to the cleaning assembly;

[0018] The cleaning assembly includes a cleaning head that abuts against the inner wall of the fine grinding jar.

[0019] Optionally, the cleaning assembly further includes a fixed arched frame, which is semi-cylindrical and arched to fit the inner wall of the grinding jar, and the cleaning heads are arranged on the side of the fixed arched frame facing the inner wall of the grinding jar.

[0020] Optionally, the fixed arched frame is installed on the upper side of the fine grinding jar in the direction of gravity.

[0021] This application provides a ball mill for aluminum powder. First, the movable design of the crushing section can actively clear blockages in the screen holes, pushing them away from the screen area and restoring the screening channel. Second, for slightly larger particles that are difficult to push away, stuck in the screen holes, or just blocking the screen holes, the crushing jaws can directly crush them, fundamentally eliminating the source of blockage. This application, by automatically clearing blockages, avoids frequent shutdowns for cleaning due to screen clogging, greatly improving the continuous operating time of the equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the interior of a ball mill shown in an exemplary embodiment of this application;

[0023] Figure 2 This is an exploded view of a portion of the structure of a ball mill shown in an exemplary embodiment of this application;

[0024] Figure 3 This is a schematic internal cross-sectional view of a portion of the structure of a ball mill shown in an exemplary embodiment of this application;

[0025] Figure 4This is a cross-sectional view of a disc screen shown in an exemplary embodiment of this application;

[0026] Figure 5 This is a schematic diagram of a disc screen shown in an exemplary embodiment of this application;

[0027] Figure 6 This is a schematic diagram of the body and the crushing part shown in an exemplary embodiment of this application;

[0028] Figure 7 This is a cross-sectional view of the inclined surface of a fine grinding jar shown in an exemplary embodiment of this application.

[0029] Among them: 100, coarse grinding jar; 200, fine grinding jar; 300, disc screen; 310, main body; 311, arc-shaped screen holes; 331a, accommodating space; 310a, fan-shaped screen hole area; 320, pressing section; 321, pressing disc; 322, rotary grinding arm; 323, pressing head; 330, rotating motor; 400, cleaning assembly; 410, fixed arch frame; 420, cleaning head. Detailed Implementation

[0030] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0031] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0032] Please refer to vomiting 1 to... Figure 4This application provides a ball mill for aluminum powder, including a coarse grinding jar 100, a fine grinding jar 200, and a disc screen 300, for graded grinding of materials from coarse to fine. The disc screen 300 is fixed between the coarse grinding jar 100 and the fine grinding jar 200. The disc screen 300 includes a body 310 and a pressing part 320. The body 310 has an arc-shaped screen hole 311. Inside the body 310, a receiving space 331a communicating with the arc-shaped screen hole 311 is formed on one side of the arc-shaped screen hole. The pressing part 320 is movably installed in the receiving space 331a and is located on the same plane as the arc-shaped screen hole 311. The pressing part 320 is configured to move between the receiving space 331a and the arc-shaped screen hole 311, and can push the blocked material. The pressing part 320 and the side of the arc-shaped screen hole 311 away from the receiving space 331a form a crushing jaw for crushing the blocked material.

[0033] First, the movable design of the crushing section 320 can actively clear blockages in the screen holes, pushing them away from the screen area and restoring the screening channel. Second, for slightly larger particles that are difficult to push away, stuck in the screen holes, or just blocking the screen holes, the crushing jaws can directly crush them, fundamentally eliminating the source of blockage. This application, by automatically clearing blockages, avoids frequent shutdowns for cleaning due to screen blockage, greatly improving the continuous operating time of the equipment. The direction of movement of the crushing section 320 can be opposite to the direction of rotation of the ball mill.

[0034] Combination Figure 5 and Figure 6 In one embodiment, the body 310 includes a plurality of circumferentially distributed fan-shaped screen hole areas 310a, each fan-shaped screen hole area 310a including a plurality of radially distributed arc-shaped screen holes 311; the pressing part 320 includes a pressing disc 321 and a plurality of rotary grinding arms 322, the plurality of rotary grinding arms 322 are connected to the circumference of the pressing disc 321, and the pressing disc 321 is rotatably connected to the body 310. The plurality of rotary grinding arms 322 correspond one-to-one with the plurality of fan-shaped screen hole areas 310a, and the rotary grinding arms 322 are accommodated in the same fan-shaped screen hole area 310a, and the plurality of accommodating spaces 331a opened on the same side of the plurality of arc-shaped screen holes 311 are interconnected to form a space.

[0035] Within the same sector, the receiving spaces 331a on the same side of all the arc-shaped screen holes 311 are interconnected, forming a continuous, sector-shaped chamber. The rotary grinding arm 322 is installed within this chamber and is housed there when the screen does not need cleaning. The grinding disc 321, as the core drive unit, is rotatably connected to the body 310, providing rotational power. Multiple rotary grinding arms 322, acting as execution units, are circumferentially and evenly connected to the grinding disc 321, used to directly push and break up the aluminum material blocking the arc-shaped screen holes 311. A single rotation of the grinding disc 321 drives all the rotary grinding arms 322 to rotate synchronously. Each rotary grinding arm 322 moves within the connecting slide of its corresponding entire sector-shaped screen hole area 310a. That is, a single rotation of the grinding disc 321 can simultaneously clean all sector areas and all radially distributed arc-shaped screen holes 311. The rotational motion pushes and squeezes the aluminum material into the dynamically formed grinding jaws. The centripetal force generated by rotation and the mechanical extrusion force work together to powerfully crush hard and brittle particles (such as aluminum powder agglomerates and critical-size particles) that are slightly larger than the sieve holes.

[0036] Combination Figures 4 to 6 In one embodiment, the rotary grinding arm 322 has multiple grinding heads 323 protruding from one side facing the fan-shaped screen area 310a. Each grinding head 323 corresponds one-to-one with a plurality of arc-shaped screen holes 311 located in the same fan-shaped screen area 310a. The multiple grinding heads 323 significantly improve the accuracy of cleaning and the crushing efficiency. Each grinding head 323 acts like a miniature hammer or pestle, precisely aligned with and acting on its corresponding single arc-shaped screen hole 311. This point-to-point design greatly increases the local pressure, allowing the grinding heads 323 to more concentratedly and powerfully impact or crush materials stubbornly clogging specific screen holes, especially effective for particles that are stuck in the holes or have high hardness.

[0037] In one embodiment, the crushing head 323 is an alloy steel head; the crushing head 323 is a wedge-shaped cutter head. This design uses an alloy steel wedge-shaped cutter head as the crushing head 323, which combines high strength and sharpness. Carbide steel is highly durable; the wedge-shaped cutter head utilizes the stress concentration effect at the tip to cleave into clogging materials and efficiently break critical particles. Its inclined structure generates shearing force during rotation, enhancing the cutting effect while reducing motion resistance.

[0038] In one embodiment, the crushing unit 320 further includes a rotary motor 330, which is disposed on the axis of the crushing disc 321 and is connected to the crushing disc 321 for transmission, driving the crushing disc 321 to rotate. Specifically, the rotary motor 330 is installed at the center of the axis of the crushing disc 321 and is directly connected to the main shaft of the crushing disc 321 through a coupling or reducer, driving the crushing disc 321 to rotate. The direct drive of the motor ensures that the rotation speed of the crushing head 323 is precisely controllable, adapting to the crushing requirements of different materials.

[0039] Combination Figure 3 and Figure 7 In one embodiment, the ball mill further includes a cleaning assembly 400 disposed inside the fine grinding jar 200, which rotates relative to the cleaning assembly 400. The cleaning assembly 400 includes a cleaning head 420 abutting against the inner wall of the fine grinding jar 200. The cleaning head 420 may have a flexible scraper, such as a rubber scraper, fixed at its end. During the fine grinding of aluminum powder, ultrafine aluminum powder, due to its high specific surface area and surface energy, is easily adhered to the inner wall of the high-speed rotating fine grinding jar 200 by electrostatic adsorption, van der Waals forces, or slight melting. This residue causes direct material loss and reduces the overall yield. Here, the fine grinding jar 200 rotates relative to the cleaning assembly 400, and the cleaning assembly 400 can be directly connected to a separate mounting base that does not rotate with the fine grinding jar 200 (e.g., fixed to a jar support) for support. Therefore, when the fine grinding jar 200 rotates, the stationary cleaning head 420 continuously and stably presses against the rotating inner wall of the jar.

[0040] The cleaning assembly 400 is mounted on a separate rotating disc driven by a dedicated motor, rotating in the opposite direction to the grinding tank 200. This creates a higher relative speed difference between the counter-rotating cleaning head 420 and the forward-rotating tank wall, achieving highly efficient cleaning. The scraped aluminum powder, under the influence of centrifugal force, gravity, and material flow generated by the rotation of the grinding tank 200, immediately detaches from the tank wall and mixes into the mainstream of aluminum powder flowing and discharging within the grinding tank 200 cavity. This ensures that the detached material is quickly carried out and recovered, significantly reducing residual loss on the tank wall.

[0041] Combination Figure 7 In one embodiment, the cleaning assembly 400 further includes a fixed arched frame 410, which is semi-cylindrical and arched to fit the inner wall of the grinding jar 200. Cleaning heads 420 are arranged on one side of the fixed arched frame 410 facing the inner wall of the grinding jar 200. The fixed arched frame 410 spans a certain length along the axial direction of the grinding jar 200, almost the same length as the grinding jar 200, and the array of cleaning heads 420 on it forms a wide and continuous "scraping band." When the grinding jar 200 rotates, this scraping band can cover and clean the adhering aluminum powder on a nearly semi-circular area of ​​the jar wall, with a cleaning efficiency far exceeding that of single-point or small-area cleaning heads 420, almost eliminating cleaning blind spots. The fixed arched frame 410, as a robust rigid foundation, provides stable and uniform support for all cleaning heads 420. Upgrading the cleaning function from a "point" to a "surface," by providing a large coverage area, significantly improves the aluminum powder recovery rate.

[0042] In one embodiment, the fixed arch frame 410 is installed on the upper side of the fine grinding jar 200 in the direction of gravity. By installing the fixed arch frame 410 on the upper side of the fine grinding jar 200 in the direction of gravity, gravity is cleverly utilized to enhance the cleaning effect, that is, the aluminum powder that has been scraped off naturally leaves the cleaning area under the action of gravity.

[0043] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A ball mill for aluminum powder, characterized by, include: Coarse grinding jar (100); Fine grinding jar (200); A disc screen (300) is fixed between the coarse grinding tank (100) and the fine grinding tank (200). The disc screen (300) includes a body (310) and a pressing part (320). The body (310) has an arc-shaped screen hole (311). Inside the body (310), a receiving space (331a) communicating with the arc-shaped screen hole (311) is provided on one side. The pressing part (320) is movably installed in the receiving space (331a) and is located on the same plane as the arc-shaped screen hole (311). The crushing part (320) is configured to move between the receiving space (331a) and the arc-shaped screen hole (311) to push the blocked material, and the crushing part (320) and the side of the arc-shaped screen hole (311) away from the receiving space (331a) form crushing jaws for crushing the blocked material.

2. The ball mill for aluminum powder according to claim 1, wherein The body (310) includes a plurality of circumferentially distributed fan-shaped sieve hole regions (310a), each of the fan-shaped sieve hole regions (310a) including a plurality of radially distributed arc-shaped sieve holes (311). The pressing section (320) includes a pressing disc (321) and a plurality of rotary grinding arms (322). The plurality of rotary grinding arms (322) are connected to the circumference of the pressing disc (321), and the pressing disc (321) is rotatably connected to the body (310). The plurality of rotary grinding arms (322) correspond one-to-one with the plurality of fan-shaped sieve hole areas (310a). The rotary grinding arms (322) are accommodated in the same fan-shaped sieve hole area (310a), and the space formed by the interconnection of a plurality of accommodating spaces (331a) opened on the same side of the plurality of arc-shaped sieve holes (311) is connected to each other.

3. The ball mill for aluminum powder according to claim 2, wherein The rotary grinding arm (322) has multiple grinding heads (323) protruding from one side toward the fan-shaped sieve area (310a), and the multiple grinding heads (323) correspond one-to-one with the multiple arc-shaped sieve holes (311) located in the same fan-shaped sieve area (310a).

4. The ball mill for aluminum powder according to claim 3, wherein The rolling head (323) is an alloy steel head; The rolling head (323) is a wedge-shaped cutter head.

5. The ball mill for aluminum powder as described in claim 1, characterized in that, A pad, which is made of steel plate, is fixedly provided on the side of the arc-shaped sieve hole (311) away from the receiving space (331a).

6. The ball mill for aluminum powder as described in claim 2, characterized in that, The pressing section (320) also includes a rotating motor (330), which is located on the axis of the pressing disc (321) and is connected to the pressing disc (321) for transmission, thereby driving the pressing disc (321) to rotate.

7. The ball mill for aluminum powder as described in any one of claims 1 to 6, characterized in that, The ball mill for aluminum powder also includes a cleaning assembly (400) disposed inside the fine grinding jar (200), the fine grinding jar (200) rotating relative to the cleaning assembly (400); The cleaning assembly (400) includes a cleaning head (420) that abuts against the inner wall of the grinding jar (200).

8. The ball mill for aluminum powder as described in claim 7, characterized in that, The cleaning assembly (400) also includes a fixed arch frame (410), which is a semi-cylindrical arch that fits into the inner wall of the grinding jar (200), and the cleaning head (420) is arranged on the side of the fixed arch frame (410) facing the inner wall of the grinding jar (200).

9. The ball mill for aluminum powder as described in claim 8, characterized in that, The fixed arch frame (410) is installed on the upper side of the fine grinding jar (200) in the direction of gravity.

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