Magnetic material processing ball mill

Abstract

The application provides a magnetic material processing ball mill device and relates to the technical field of material grinding. The device comprises a main cylinder and a secondary cylinder above the main cylinder. A through channel is arranged in the central area of the end of the main cylinder. A plurality of main wheels are arranged in the periphery of the through channel to the end of the main cylinder. The end of the secondary cylinder is provided with a secondary cylinder cover. Two secondary cylinder covers are combined to the secondary cylinder, so that the secondary cylinder has a cavity for loading a plurality of spherical grinding media. The secondary cylinder cover is elastically combined to the end of the secondary cylinder. In the application, the speed of the plurality of spherical grinding media entering the main cylinder is related to the rotating speed of the main cylinder. Specifically, when the rotating speed of the main cylinder is slow, the speed of the plurality of spherical grinding media entering the main cylinder is slowed down. Thus, the load is reduced in the stage of increasing the rotating speed of the main cylinder. On the contrary, when the rotating speed of the main cylinder climbs to the working speed, the plurality of spherical grinding media is guided to enter the main cylinder quickly, so that the grinding work is facilitated and quickened.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material grinding technology, and in particular to a magnetic material processing ball mill device. BACKGROUND

[0002] The ball mill device has the technical problem of including a large starting load and a long load duration during the starting to uniform speed axial rotation. Currently, the targeted solutions or improvements to this problem include designing a special circuit and reducing the load.

[0003] As for load reduction, it can be understood that the material to be ground is transferred to the device after stable operation of the device. In actual situations, it has some effect, but the effect is not outstanding. That is, the grinding medium in the ball mill device has a much larger starting load on the device than the material. It can be predicted that the load will be greatly reduced by removing the grinding medium from the device.

[0004] Of course, there are also certain technical difficulties in how to transfer the grinding medium to the stably running device. That is, the grinding medium is simply thrown directly into the device, and the device will consume some kinetic energy to drive the grinding medium to roll in the device, which is not worth the loss. Therefore, based on the above problems, this paper proposes a magnetic material processing ball mill device with common magnetic ore grinding as the grinding object. SUMMARY

[0005] The purpose of the present application is to provide a magnetic material processing ball mill device to solve the above technical problems.

[0006] To solve the above technical problems, the following technical solutions are adopted:

[0007] A magnetic material processing ball mill device includes a main cylinder and a secondary cylinder above the main cylinder;

[0008] The central region of the end of the main cylinder is equipped with a through channel;

[0009] A plurality of main wheels are arranged around the periphery of the through channel to the end of the main cylinder;

[0010] The end of the secondary cylinder is equipped with a secondary cylinder cover, wherein the two secondary cylinder covers are combined to the secondary cylinder, so that the secondary cylinder has a cavity for loading a plurality of spherical grinding media;

[0011] The secondary cylinder cover has elasticity at the end of the secondary cylinder and is rotationally connected to the secondary cylinder. The secondary cylinder cover also has an extension part extending into the moving path of the main wheel;

[0012] When the main cylinder rotates axially, the extension part is pushed by the main wheel to make the secondary cylinder cover deflect relative to the secondary cylinder, or the extension part is pushed by the main wheel to a critical point to make the secondary cylinder cover deflect relative to the secondary cylinder.

[0013] The auxiliary cylinder cover has an opening offset from the extension, the opening directly accesses the cavity filled with spherical grinding media, and the opening also connects with the pipe which extends into the main cylinder through the channel and is curved along the curved surface of the main cylinder;

[0014] When the main wheels push the extension, the opening approaches and finally reaches the top of the main cylinder axis, guiding the spherical grinding media in the cavity to enter the main cylinder along the pipe, or after the main wheels push the extension to the critical point, the opening follows the auxiliary cylinder cover to reset, blocking the spherical grinding media from entering the pipe.

[0015] Preferably, it also includes a soft belt around all the main wheels, which guides other main wheels to rotate with the main wheel in contact with the extension when any main wheel pushes the extension;

[0016] Each main wheel is also equipped with an air assembly connected to the main cylinder;

[0017] All air assemblies suck air when any main wheel pushes the extension, or after the main wheel pushes any extension to the critical point, all air assemblies press air into the main cylinder.

[0018] Preferably, it also includes a soft rod connecting the air assembly and the main wheel, which guides the air assembly to suck air by winding the soft rod with the main wheel when the main wheel pushes the extension, or after the main wheel pushes any extension to the critical point, the air assembly presses air into the main cylinder.

[0019] Preferably, the air assembly includes a sleeve mounted at the end of the main cylinder, a piston slidingly fitted in the sleeve and connected to the soft rod, and a second spring for pulling the piston to press air into the main cylinder after the main wheel pushes any extension to the critical point.

[0020] Preferably, the main wheel is equipped with two ring grooves that do not interfere with each other, one of which is used to be wound by the soft belt, and the other of which is used to be wound by the soft rod.

[0021] Preferably, the sleeve to the main cylinder is equipped with an air pipe, one end of which is connected to the sleeve and the other end of which is inserted into the main cylinder along the axis of the main wheel.

[0022] Preferably, there is a secondary wheel between two adjacent main wheels for restraining the soft belt, which makes the soft belt concave between the adjacent main wheels, and the transmission route of the soft belt is offset from the movement range of the extension.

[0023] Preferably, the pipe guides the spherical grinding media to enter the main cylinder in the direction of rotation of the main cylinder.

[0024] Preferably, the pipeline includes a first pipe connected to the opening, a second pipe connected to the first pipe, a third pipe connected to the second pipe, the third pipe entering the main cylinder through the channel, and the pipeline also includes a fourth pipe connected to the third pipe, and a fifth pipe connected to the fourth pipe and conforming to the curved surface of the main cylinder.

[0025] Preferably, the second tube is a soft tube, and the channel is provided with a bushing for wrapping around the third tube and filling the annular gap.

[0026] The beneficial effects of this invention are:

[0027] 1. In this invention, the speed at which several spherical grinding media enter the main cylinder is related to the rotational speed of the main cylinder. Specifically, if the rotational speed of the main cylinder is slow, the speed at which several spherical grinding media enter the main cylinder will be correspondingly slowed down. In this way, the load is reduced during the stage of increasing the rotational speed of the main cylinder. Conversely, when the rotational speed of the main cylinder climbs to the working speed, it guides several spherical grinding media to quickly enter the main cylinder, which facilitates the rapid commencement of grinding work.

[0028] 2. The present invention utilizes the kinetic energy generated when the extension pushes the main wheel to pressurize the air into the main cylinder, guide the magnetic material inside the main cylinder to tumble faster, and improve the ball milling quality. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a ball milling device for processing magnetic materials.

[0030] Figure 2 for Figure 1 Side view;

[0031] Figure 3 for Figure 1 The diagram shows the structure of the magnetic material processing ball mill after it has been cut apart from the main cylinder.

[0032] Figure 4 for Figure 2 Side view of the intermediate tube after further lateral sectioning;

[0033] Figure 5 This is a side view of the gas assembly at the main cylinder cover.

[0034] Figure 6 for Figure 5 A schematic diagram of the three-dimensional structure;

[0035] Figure 7 for Figure 1 The diagram shows the combined structure of the magnetic material processing ball mill equipment and its frame.

[0036] Label: 1, main cylinder; 2, auxiliary cylinder; 3, main cylinder cover; 4, through slot; 5, material port; 6, auxiliary cylinder cover; 7, extension; 8, shaft rod; 9, shaft tube; 10, first tube; 11, second tube; 12, third tube; 13, shaft sleeve; 14, fourth tube; 15, fifth tube; 16, auxiliary wheel; 17, soft belt; 18, main wheel; 19, soft rod; 20, air tube; 21, air assembly; 211, sleeve; 212, second spring; 213, piston; 22, first spring; 23, stop block; 24, first spring groove; 25, frame; 26, tube groove. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the following further describes the present application in combination with specific embodiments and drawings. However, the following embodiments are only preferred embodiments of the present application, and are not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0038] The specific embodiments of the present application are described below in combination with the drawings.

[0039] Embodiment 1

[0040] In this embodiment, a magnetic material processing ball mill device is proposed. Please refer to Figures 1-7 The magnetic material processing ball mill device comprises a main cylinder 1 and an auxiliary cylinder 2 located above the main cylinder 1.

[0041] The main cylinder 1 and the auxiliary cylinder 2 are fixed by a frame 25 as shown in Figure 7 . Specifically, the main cylinder covers 3 arranged on both sides of the main cylinder 1 serve as the end portions of the main cylinder 1.

[0042] In addition, the central region of the main cylinder cover 3 has an outwardly extending shaft tube 9 compared to the main cylinder 1, and the shaft tube 9 penetrates the frame 25, so that the main cylinder 1 is erected in the frame 25. It should be noted that the shaft tube 9 has a through passage.

[0043] The auxiliary cylinder 2 has auxiliary cylinder covers 6 on both sides, and the two auxiliary cylinder covers 6 are combined to the auxiliary cylinder 2, so that the auxiliary cylinder 2 has a cavity for loading a plurality of spherical grinding media. In addition, the auxiliary cylinder 2 has a shaft rod 8 coaxial with the axis of the auxiliary cylinder 2, and the shaft rod 8 is fixedly combined with the auxiliary cylinder 2. In addition, the end portion of the shaft rod 8 extends out of the auxiliary cylinder cover 6 and extends to the frame 25, so that the auxiliary cylinder 2 is erected in the frame 25.

[0044] Unlike the main cylinder cover 3 arranged on the main cylinder 1, the auxiliary cylinder cover 6 has a rotating fit with the end portion of the auxiliary cylinder 2. Specifically, as shown in Figure 4 , the auxiliary cylinder cover 6 extends inwardly from the end side of the main cylinder 1, and the inwardly extending portion is provided with a first spring groove 24.

[0045] As a match, the inner cylinder wall of the main cylinder 1 has a stop 23 extending into the first spring groove 24, so that the first spring 22 is placed in the first spring groove 24, and one end of the first spring 22 is fixedly combined with the stop 23, and the other end of the first spring 22 is fixedly combined with the groove end of the first spring groove 24, so that the secondary cylinder cover 6 has elasticity when the secondary cylinder cover 6 rotates with the end of the secondary cylinder 2.

[0046] Please continue to refer to Figures 1-7 , the end of the main cylinder 1, that is, the main cylinder cover 3, has a plurality of main wheels 18 arranged around the shaft tube 9. In this embodiment, the number of main wheels 18 is four, and the four main wheels 18 are embedded in the main cylinder cover 3 and rotationally combined with the main cylinder cover 3.

[0047] The function of the main wheel 18 is to enable the secondary cylinder cover 6 to periodically reciprocate when the main cylinder 1 rotates axially, so that an extension 7 extending into the moving path of the main wheel 18 is arranged at the secondary cylinder cover 6 in order to take power. Further, the extension 7 is pushed by the main wheel 18 when the main cylinder 1 rotates axially, so that the secondary cylinder cover 6 is deflected relative to the secondary cylinder 2, or the extension 7 is pushed by the main wheel 18 to a critical point, so that the secondary cylinder cover 6 is reversely deflected relative to the secondary cylinder 2.

[0048] The core of this embodiment is to make a plurality of spherical grinding media with kinetic energy enter the main cylinder 1 along the rotation direction of the main cylinder 1, and accordingly, an opening is arranged at the secondary cylinder cover 6 and is staggered with the extension 7. Further, the opening directly penetrates the cavity filled with a plurality of spherical grinding media, and the opening is also connected with a pipeline, which is extended into the main cylinder 1 through the through channel and is curved in the main cylinder 1 in cooperation with the curved surface of the main cylinder 1.

[0049] In this embodiment, the pipeline entering the main cylinder 1 through the opening is functionally modified, specifically, as shown in Figures 1-3 , the pipeline includes a first pipe 10 connected with the opening, a second pipe 11 connected with the first pipe 10, a third pipe 12 connected with the second pipe 11, the third pipe 12 is extended into the main cylinder 1 through the shaft tube 9, the pipeline further includes a fourth pipe 14 connected with the third pipe 12, and a fifth pipe 15 connected with the fourth pipe 14 and curved in cooperation with the curved surface of the main cylinder 1. It should be noted that the second pipe 11 is a soft pipe, and in addition, the channel is provided with a shaft sleeve 13 for winding the third pipe 12 and filling the annular gap.

[0050] In combination with the movement track of the auxiliary cylinder cover 6, it can be foreseen that when the main wheel 18 pushes the extension 7, the opening approaches and finally reaches the top of the main cylinder 1 axis, guiding the several spherical grinding media in the guide cavity to enter the main cylinder 1 along the rotation direction of the main cylinder 1, or after the main wheel 18 pushes the extension 7 to the critical point, the opening follows the auxiliary cylinder cover 6 to reset, blocking the several spherical grinding media from entering the pipeline.

[0051] Further explanation, as explained above, the speed of the several spherical grinding media entering the main cylinder 1 is related to the rotation speed of the main cylinder 1, that is, the rotation speed of the main cylinder 1 is slow, then the speed of the several spherical grinding media entering the main cylinder 1 slows down accordingly, so that in this stage of increasing the rotation speed of the main cylinder 1, the load is reduced, on the contrary, when the rotation speed of the main cylinder 1 climbs to the working speed, the several spherical grinding media are guided to enter the main cylinder 1 quickly, which facilitates the rapid development of grinding work.

[0052] Embodiment 2

[0053] This embodiment is an improved example of embodiment 1, which improves the use of kinetic energy generated when the extension 7 pushes the main wheel 18 to press air with pressure into the main cylinder 1, guiding the magnetic material in the main cylinder 1 to accelerate tumbling and improve the ball milling quality.

[0054] For the convenience of review, the relevant contents in embodiment 1 are copied here.

[0055] In this embodiment, a magnetic material processing ball mill device is proposed, please refer to Figures 1-7 The magnetic material processing ball mill device comprises a main cylinder 1 and an auxiliary cylinder 2 located above the main cylinder 1.

[0056] The main cylinder 1 and the auxiliary cylinder 2 are fixed by the frame 25 shown in Figure 7 Specifically, the main cylinder covers 3 arranged on both sides of the main cylinder 1 serve as the end of the main cylinder 1.

[0057] In addition, the central area of the main cylinder cover 3 has an axle tube 9 extending outward compared to the main cylinder 1, which penetrates the frame 25, so that the main cylinder 1 is erected in the frame 25. It should be noted that the axle tube 9 has a through channel.

[0058] The auxiliary cylinder 2 has auxiliary cylinder covers 6 on both sides, and the two auxiliary cylinder covers 6 are combined to the auxiliary cylinder 2, so that the auxiliary cylinder 2 has a cavity for loading several spherical grinding media. In addition, the auxiliary cylinder 2 has an axle rod 8 coinciding with the axis of the auxiliary cylinder 2, which is fixedly combined with the auxiliary cylinder 2. In addition, the end of the axle rod 8 extends out of the auxiliary cylinder cover 6 and extends to the frame 25, so that the auxiliary cylinder 2 is erected in the frame 25.

[0059] Unlike the main cylinder cover 3 arranged on the main cylinder 1, the auxiliary cylinder cover 6 has a rotating fit with the end of the auxiliary cylinder 2, specifically, as shown in Figure 4As shown, the auxiliary cylinder cover 6 extends inwardly from the end side of the main cylinder 1, wherein the inwardly extending portion is provided with a first spring groove 24.

[0060] As a match, the inner cylinder wall of the main cylinder 1 has a stopper 23 extending into the first spring groove 24, so that the first spring 22 is placed in the first spring groove 24, and one end of the first spring 22 is fixedly combined with the stopper 23, and the other end of the first spring 22 is fixedly combined with the groove end of the first spring groove 24, thereby enabling the auxiliary cylinder cover 6 to have elasticity when the auxiliary cylinder cover 6 rotates with the end of the auxiliary cylinder 2.

[0061] Please continue to refer to Figures 1-7 , the end of the main cylinder 1, that is, the main cylinder cover 3, has a plurality of main wheels 18 arranged around the shaft tube 9. In this embodiment, the number of main wheels 18 is four, and the four main wheels 18 are embedded in the main cylinder cover 3 and rotationally matched with the main cylinder cover 3.

[0062] The function of the main wheel 18 is to enable the auxiliary cylinder cover 6 to periodically reciprocate when the main cylinder 1 rotates axially, so that an extension 7 extending into the moving path of the main wheel 18 is arranged at the auxiliary cylinder cover 6 in order to take power. Further, when the main cylinder 1 rotates axially, the extension 7 is pushed by the main wheel 18 to deflect the auxiliary cylinder cover 6 relative to the auxiliary cylinder 2, or after the main wheel 18 pushes the extension 7 to a critical point, the auxiliary cylinder cover 6 is reversely deflected relative to the auxiliary cylinder 2.

[0063] The core of this embodiment is to enable a plurality of spherical grinding media with kinetic energy to enter the main cylinder 1 along the rotation direction of the main cylinder 1. Accordingly, an opening is arranged at the auxiliary cylinder cover 6 and is staggered with the extension 7. Further, the opening directly penetrates a cavity filled with a plurality of spherical grinding media, and the opening is also connected with a pipeline, which extends into the main cylinder 1 through the through channel and is curved in the main cylinder 1 to match the curved surface of the main cylinder 1.

[0064] In this embodiment, the pipeline entering the main cylinder 1 through the opening is functionally modified. Specifically, as shown in Figures 1-3 , the pipeline includes a first pipe 10 connected with the opening, a second pipe 11 connected with the first pipe 10, a third pipe 12 connected with the second pipe 11, the third pipe 12 extending into the main cylinder 1 through the shaft tube 9, the pipeline further includes a fourth pipe 14 connected with the third pipe 12, and a fifth pipe 15 connected with the fourth pipe 14 and curved to match the curved surface of the main cylinder 1. It should be noted that the second pipe 11 is a soft pipe, and in addition, the through channel is provided with a shaft sleeve 13 for winding the third pipe 12 and filling the annular gap (in this embodiment, the shaft sleeve 13 also has the function of filtering and balancing the internal and external pressure difference).

[0065] In combination with the movement track of the auxiliary cylinder cover 6, it can be foreseen that when the main wheel 18 pushes the extension 7, the opening approaches and finally reaches the top of the main cylinder 1 axis, guiding several spherical grinding media in the guide cavity to enter the main cylinder 1 in the direction of rotation of the main cylinder 1, or after the main wheel 18 pushes the extension 7 to the critical point, the opening follows the auxiliary cylinder cover 6 to reset, blocking several spherical grinding media from entering the pipeline.

[0066] The embodiment adds the following components compared to embodiment 1, specifically, a soft belt 17 is arranged, which is wound around all the main wheels 18, so it can be determined that when any main wheel 18 pushes the extension 7, the soft belt 17 will guide the other main wheels 18 to rotate together with the main wheel 18 in contact with the extension 7.

[0067] A gas assembly 21 is also arranged at each main wheel 18, which is in communication with the main cylinder 1.

[0068] Further explanation, all the gas assemblies 21 suck air when any main wheel 18 pushes the extension 7, or after the main wheel 18 pushes any extension 7 to the critical point, all the gas assemblies 21 press air into the main cylinder 1.

[0069] Further explanation, a soft rod 19 is arranged at the main wheel 18 for connection with the gas assembly 21, which is wound by the main wheel 18 to guide the gas assembly 21 to suck air when the main wheel 18 pushes the extension 7, or after the main wheel 18 pushes any extension 7 to the critical point, the gas assembly 21 press air into the main cylinder 1.

[0070] Regarding the gas assembly 21, as shown in Figure 5 and Figure 6 , it includes a sleeve 211 mounted at the end of the main cylinder 1, a piston 213 in sliding fit with the sleeve 211 and connected with the soft rod 19, and a second spring 212 for pulling the piston 213 to press air into the main cylinder 1 after the main wheel 18 pushes any extension 7 to the critical point.

[0071] It should be noted that the bottom of the sleeve 211 is provided with a one-way valve (not marked in the figure), which guides air outside the sleeve 211 into the sleeve 211 when the soft rod 19 pulls the piston 213, and conversely, when the second spring 212 pulls the piston 213 in the opposite direction, the one-way valve is closed, and air enters the main cylinder 1 from the air pipe 20 (the air pipe 20 is provided between the sleeve 211 and the main cylinder 1, one end of which is connected with the sleeve 211, and the other end is inserted into the main cylinder 1 along the axis of the main wheel 18).

[0072] In the embodiment, in order to prevent the extension 7 from interfering with the soft belt 17 and the soft rod 19 when contacting the main wheel 18, two non-interfering ring grooves are arranged at the main wheel 18, one of which is used for being wound by the soft belt 17, and the other is used for winding the soft rod 19. Further, the movement range of the soft belt 17 and the soft rod 19 does not exceed the ring grooves, so that even if the extension 7 contacts the main wheel 18, it will not interfere with the normal work of the soft belt 17 and the soft rod 19.

[0073] In addition, a sub-wheel 16 for restricting the soft belt 17 is arranged between the two adjacent main wheels 18, which makes the soft belt 17 concave between the adjacent main wheels 18, so that the transmission route of the soft belt 17 is staggered with the movement range of the extension 7.

[0074] The further contents of the embodiment 1 and the embodiment 2 are as follows:

[0075] ① The uppermost part of the sub-cylinder 2 is provided with a plurality of ball-shaped grinding media entering grooves 4 into the sub-cylinder 2.

[0076] ② The curved wall of the main cylinder 1 is provided with a material port 5 for the magnetic material and the ground magnetic material to enter and exit, which is covered by a sealing plate.

[0077] ③ The frame 25 is provided with a pipe groove 26 for the first pipe 10 to rotate with the sub-cylinder cover 6.

[0078] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0079] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A magnetic material processing ball mill apparatus, characterized by: The main cylinder, the sub-cylinder above the main cylinder; The central region of the end of the main cylinder is equipped with a through channel; The periphery around the through channel is arrayed with several main wheels at the end of the main cylinder; The end of the sub-cylinder is equipped with a sub-cylinder cover, wherein two sub-cylinder covers are combined to the sub-cylinder, so that the sub-cylinder has a cavity for filling several spherical grinding media; The sub-cylinder cover is rotationally combined with the end of the sub-cylinder by an elastic element, and the sub-cylinder cover also has an extension extending into the moving path of the main wheel; The inner cylinder wall of the main cylinder has a stop extending into the first spring groove, so that the first spring is placed in the first spring groove, one end of the first spring is fixedly combined with the stop, the other end of the first spring is fixedly combined with the groove end of the first spring groove, and the sub-cylinder cover has elastic rotation combination with the end of the sub-cylinder when the sub-cylinder cover is rotated; When the extension is pushed by the main wheel during the axial rotation of the main cylinder, the sub-cylinder cover is deflected relative to the sub-cylinder, or after the extension is pushed to a critical point by the main wheel, the sub-cylinder cover is reversely deflected relative to the sub-cylinder; The sub-cylinder cover has an opening staggered with the extension, the opening directly penetrates the cavity for filling several spherical grinding media, and the opening is also combined with a pipeline, the pipeline extends into the main cylinder from the through channel and is combined with the curved surface of the main cylinder in the main cylinder; When the extension is pushed by the main wheel, the opening approaches and finally reaches directly above the axis of the main cylinder, guiding several spherical grinding media in the cavity to enter the main cylinder along the pipeline, or after the extension is pushed to a critical point by the main wheel, the opening is reset with the sub-cylinder cover, blocking several spherical grinding media from entering the pipeline.

2. The magnetic material processing ball mill apparatus of claim 1, wherein: It also includes a soft belt around all the main wheels, which guides other main wheels to rotate together with the main wheel in contact with the extension when any main wheel pushes the extension; Each main wheel is also provided with an air assembly in communication with the main cylinder; All air assemblies suck air when any main wheel pushes the extension, or all air assemblies press air into the main cylinder after any extension is pushed to a critical point by the main wheel.

3. The magnetic material processing ball mill apparatus of claim 2, wherein: It also includes a soft rod for connecting the air assembly with the main wheel, which guides the air assembly to suck air by winding the soft rod around the main wheel when the main wheel pushes the extension, or the air assembly presses air into the main cylinder after any extension is pushed to a critical point by the main wheel.

4. The magnetic material processing ball mill apparatus of claim 3, wherein: The air assembly includes a sleeve mounted at the end of the main cylinder, a piston in sliding fit with the sleeve in the sleeve and connected with the soft rod, and a second spring for pulling the piston to press air into the main cylinder after any extension is pushed to a critical point by the main wheel.

5. The magnetic material processing ball mill apparatus of claim 3, wherein: The main wheel is provided with two ring grooves that do not interfere with each other, one of which is used to be wound by the soft belt, and the other of which is used to wind the soft rod.

6. The magnetic material processing ball mill apparatus of claim 4, wherein: The sleeve is provided with an air pipe between the sleeve and the main cylinder, one end of the air pipe is combined with the sleeve, and the other end is inserted into the main cylinder along the axis of the main wheel.

7. The magnetic material processing ball mill apparatus of claim 5, wherein: There is also a sub-wheel between adjacent two main wheels for restraining the soft belt, which makes the soft belt concave between adjacent main wheels, so that the transmission route of the soft belt is staggered with the movement range of the extension.

8. The magnetic material processing ball mill apparatus of claim 2, wherein: The pipeline guides several spherical grinding media to enter the main cylinder in the rotation direction of the main cylinder.

9. The magnetic material processing ball mill apparatus of claim 8, wherein: The pipe comprises a first pipe connected to the opening, a second pipe connected to the first pipe, a third pipe connected to the second pipe, the third pipe entering the main cylinder through the passage, the pipe further comprises a fourth pipe connected to the third pipe, and a fifth pipe connected to the fourth pipe and matching the curved surface of the main cylinder.

10. The magnetic material processing ball mill apparatus of claim 9, wherein: The second pipe is a soft pipe, and in addition, the passage is provided with a bushing for winding around the third pipe and filling the annular gap.

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