Rotor structure and inner cylinder structure of a horizontal sand mill

Abstract

The present invention discloses a rotor structure and inner cylinder structure for a horizontal sand mill. The outer wall surface of the rotor structure is provided with a plurality of grinding blocks and a first protrusion. The grinding blocks and the first protrusion are cross-arranged along the circumferential and axial directions of the rotor structure on the outer wall surface of the rotor structure. The grinding blocks have four side surfaces and a top surface, wherein the first side surface faces the first end of the grinding chamber, the second side surface faces the second end of the grinding chamber, and the third side surface is a sloped surface and is obliquely opposite to the grinding blocks axially adjacent to the grinding blocks. Among the grinding blocks distributed axially on the outer wall surface of the rotor structure, the normal directions of the third side surfaces of at least one pair of adjacent grinding blocks intersect, and the intersection point is located between the pair of adjacent grinding blocks. The inner wall surface of the inner cylinder structure is provided with a plurality of elliptical third protrusions. The present invention can increase the collision frequency between grinding media and between the grinding media and the inner cylinder wall surface, improve the uniformity of materials in the grinding chamber, and enhance the grinding and crushing efficiency of the sand mill.

Description

Technical Field

[0001] The present invention relates to the technical field of sand mills, in particular to a rotor structure and an inner cylinder structure of a horizontal sand mill. Background Art

[0002] A sand mill is a machine that grinds materials and grinding media in a grinding chamber by driving a rotor to cause collision and friction. Due to the different specific gravities and hardnesses of the materials and grinding media, the materials will be ground and broken down into tiny particles during the collision between the materials and the grinding media. Prior art 201821867936.4 discloses a grinding rotor and a sand mill. A disc-type grinding rotor is designed, which promotes the collision of materials and grinding media based on the geometric structural features of the protrusions on both sides. The first and second protrusions can increase the head-on area (contact area) between the turntable and the materials and grinding media, allowing more materials and grinding media to gain speed and promote collision. The second protrusion also imparts centrifugal force to the materials and grinding media to prevent accumulation at the bottom. However, this structural feature is concentrated in the circumferential direction, and its ability to impart speed to materials and grinding media in other spaces is limited, making the rotor's grinding effect not high. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a rotor structure and an inner cylinder structure of a horizontal sand mill, which can increase the collision frequency and promote the material and grinding medium to participate in the collision crushing process more effectively.

[0004] In order to solve the above technical problems, the present invention discloses, in a first aspect, a rotor structure of a horizontal sand mill. The main body of the rotor structure is a rotatable cylindrical structure, and a plurality of grinding blocks are provided on the outer wall surface of the rotor structure. The rotor structure is installed in a grinding chamber of the horizontal sand mill, and the grinding chamber is a cylindrical structure with two ends. The discharge port of the horizontal sand mill is connected to the grinding chamber through the first end of the grinding chamber, and the feed port of the horizontal sand mill is connected to the grinding chamber through the second end of the grinding chamber.

[0005] A first protrusion is also provided on the outer wall surface of the rotor structure;

[0006] The grinding blocks and the first protrusions are cross-arranged on the outer wall surface of the rotor structure along the circumferential and axial directions of the rotor structure, so that the grinding blocks are adjacent to the first protrusions in both the circumferential and axial directions of the rotor structure, and the first protrusions are adjacent to the grinding blocks in both the circumferential and axial directions of the rotor structure;

[0007] The grinding block has four side surfaces and a top surface, wherein the first side surface faces the first end of the grinding chamber, the second side surface faces the second end of the grinding chamber, and the third side surface is a sloped surface and is obliquely facing the grinding block axially adjacent to the grinding block;

[0008] Among the grinding blocks distributed along the axial direction on the outer wall surface of the rotor structure, the normal directions of the third side surfaces of at least one pair of adjacent grinding blocks intersect, and the intersection point is located between the pair of adjacent grinding blocks.

[0009] As an optional embodiment, in the first aspect of the present invention, the first protrusion is a pair of elongated protrusions, and the orientation of the pair of elongated protrusions has a first angle, the projection of the angle bisector of the first angle on the outer wall surface of the rotor structure is in the same direction as the circumferential direction of the rotor structure on the outer wall surface, and the tip of the first angle points to the third side surface of the grinding block circumferentially adjacent to the first protrusion; the first angle is 60~150 degrees.

[0010] As another optional embodiment, in the first aspect of the present invention, the first angle is 90 degrees.

[0011] As another optional embodiment, in the first aspect of the present invention, the slope of the third side surface is 20 to 70 degrees, and the slope is based on the tangential direction of the junction between the outer wall surface of the rotor structure and the third side surface.

[0012] As another optional embodiment, in the first aspect of the present invention, among the grinding blocks distributed axially on the outer wall surface of the rotor structure, the normal direction of the third side surface of the grinding block near the discharge port intersects with the normal direction of the third side surface of the grinding block near the feed port, and the intersection point is located between the two grinding blocks.

[0013] As another optional embodiment, in the first aspect of the present invention, the straight line projection of an arbitrary straight line across the width direction on the third side surface on the normal plane at the intersection of the third side surface and the outer wall surface of the rotor structure, the angle between the projection of the straight line on the outer wall surface of the rotor structure and the projection of the central axis of the rotor structure on the outer wall surface is 15 to 75 degrees.

[0014] As another optional embodiment, in the first aspect of the present invention, the grinding block is provided with an elliptical second protrusion on both the first side surface and the second side surface; the orientation of the second protrusion is at a second angle with the radial direction of the rotor, and the second angle is 15 to 75 degrees, or the orientation of the second protrusion is in the same direction as the radial direction of the rotor.

[0015] The second aspect of the present invention discloses an inner cylinder structure of a horizontal sand mill, wherein the grinding chamber of the inner cylinder structure is the grinding chamber described in the first aspect of the present invention; a plurality of elliptical third protrusions are provided on the inner wall surface of the inner cylinder structure; the orientation of each of the third protrusions on the inner wall of the inner cylinder structure forms a third angle with the axial direction of the inner cylinder structure, and the third angle is 20 to 70 degrees.

[0016] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0017] In the embodiment of the present invention, the third side surface of the grinding block is tilted outward and forms a certain angle with the axial direction of the rotor structure, so that the grinding medium can obtain a speed component in the radial direction and the axial direction after being accelerated by the grinding block. By retracting the third side surfaces of adjacent grinding blocks inward, the materials and grinding media near the third side surfaces of the two groups of grinding blocks can be moved in the designed direction to achieve directional collision, thereby greatly improving the collision frequency, accelerating the circulation rate of the grinding media in the grinding chamber, and reducing the accumulation dead zone of the grinding media on both sides of the material inlet and outlet of the grinding chamber, thereby achieving better grinding effect; the first protrusion on the rotor structure can disturb objects in the surrounding area, avoiding the material and grinding media from sticking to the outer wall of the rotor structure without participating in the collision movement, achieving the effect of dispersion and energization, and improving the uniformity of materials of various particle sizes in the grinding chamber, thereby improving the concentration of the particle size distribution of the material at the discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic structural diagram of a rotor structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0020] Figure 2 The embodiment of the present invention is disclosed Figure 1 A partial enlarged schematic diagram of part A;

[0021] Figure 3 This is a schematic structural diagram of a rotor structure and a grinding chamber of a horizontal sand mill disclosed in an embodiment of the present invention;

[0022] Figure 4 The embodiment of the present invention is disclosed Figure 3 Schematic diagram of the flow direction of materials and grinding media when the rotor structure rotates counterclockwise;

[0023] Figure 5 This is another structural schematic diagram of a rotor structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0024] Figure 6 The embodiment of the present invention is disclosed Figure 5 Schematic diagram of the force direction of the second protrusion when the middle rotor structure rotates counterclockwise;

[0025] Figure 7This is another structural schematic diagram of a rotor structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the radial cross-section structure of the rotor structure of a horizontal sand mill disclosed in an embodiment of the present invention.

[0027] Figure 9 This is a schematic structural diagram of an inner cylinder structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0028] Figure 10 This is another structural schematic diagram of the inner cylinder structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0029] Figure 11 This is another structural schematic diagram of the inner barrel structure of a horizontal sand mill disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figures 1 to 8 The present invention discloses a rotor structure 1 of a horizontal sand mill. The main body of the rotor structure 1 is a rotatable cylindrical structure, and a plurality of grinding blocks 11 are provided on the outer wall surface of the rotor structure 1. The rotor structure 1 is disposed in a grinding chamber 2 of the horizontal sand mill. The grinding chamber 2 is a cylindrical structure with two ends. The discharge port B of the horizontal sand mill communicates with the grinding chamber 2 through the first end 21 of the grinding chamber 2, and the feed port C of the horizontal sand mill communicates with the grinding chamber 2 through the second end 22 of the grinding chamber 2.

[0033] The outer wall surface of the rotor structure 1 is further provided with a first protrusion 12;

[0034] The grinding blocks 11 and the first protrusions 12 are cross-arranged on the outer wall surface of the rotor structure 1 along the circumferential and axial directions of the rotor structure 1, so that the grinding blocks 11 are adjacent to the first protrusions 12 in both the circumferential and axial directions of the rotor structure 1, and the first protrusions 12 are adjacent to the grinding blocks 11 in both the circumferential and axial directions of the rotor structure 1;

[0035] The grinding block 11 has four side surfaces and a top surface, wherein the first side surface 111 faces the first end 21 of the grinding chamber 2, the second side surface 112 faces the second end 22 of the grinding chamber 2, and the third side surface 113 is a sloped surface and is diagonally facing the grinding block 11 axially adjacent to the grinding block 11;

[0036] Among the grinding blocks 11 distributed axially on the outer wall of the rotor structure 1 , the normal directions of the third side surfaces 113 of at least one pair of adjacent grinding blocks 11 intersect with each other, and the intersection point is located between the pair of adjacent grinding blocks 11 .

[0037] Optionally, the fourth side surface can also be configured in the same manner as the third side surface 113, that is, a sloped surface and diagonally facing the grinding block 11 axially adjacent to the grinding block 11, so that the rotor structure 1 can rotate forward or reverse. If only the third side surface 113 is configured in this manner, the rotation direction of the rotor structure 1 needs to make the third side surface 113 face forward.

[0038] See also Figure 1 、 3 The feed port C of the horizontal sand mill of this embodiment is positioned between the inner wall of the grinding chamber 2 and the outer wall of the rotor structure 1. This allows material to enter the outer wall of the rotor structure 1 for grinding before exiting through the discharge port B at the other end of the grinding chamber 2. The rotor structure 1 can be provided with a through hole 14 away from the feed port C, allowing material and grinding media (such as zirconium balls) to enter the rotor structure 1 from the outer wall for further grinding. The flow channel, which is the blank area on the rotor without the grinding blocks 11, has a large flow area, and the flow resistance of the material through the grinding block area is relatively low. The staggered distribution of the grinding blocks 11 creates a tortuous path for the material and grinding media as they move along the rotor's axial direction, which also increases the grinding time of the material.

[0039] See also Figure 3 , Figure 3 The force direction of the third side surface 113 when the rotor rotates counterclockwise is marked. It can be seen that when the third side surfaces 113 at both ends are oriented inward (so that the materials and grinding media near the material inlet and outlet at both ends move toward the middle, increasing the collision frequency), the directions of the adjacent third side surfaces 113 in the middle are different, and all point to the grinding blocks 11 adjacent in the oblique direction. Among them, the directions of the second and third grinding blocks are oriented inward, and the directions of the third grinding block and the grinding block near the feed inlet C are oriented inward, which can make the materials and grinding media near the third side surfaces 113 of the two groups of grinding blocks move in the pointed direction to achieve directional collision, greatly increasing the collision frequency.

[0040] When the material and grinding medium flow through the first protrusion 12, a vortex will appear, and a vortex will be formed during separation, which can disturb the material in the surrounding area, thereby preventing the material and grinding medium from sticking to the outer wall of the rotor without participating in the collision movement, achieving a dispersed energizing effect, and improving the uniformity of the material in the grinding area, thereby increasing the grinding and capture frequency of materials of different particle sizes during grinding. At the same time, the disturbed material and grinding medium just hit the third side surface 113 of the grinding block 3 in the direction of movement. The third side surface 113 can directionally push the material and grinding medium to a larger surrounding area according to its direction to further increase the collision frequency.

[0041] It can be seen that in the embodiment of the present invention, the third side surface 113 of the grinding block 11 is tilted outward and forms a certain angle with the axial direction of the rotor structure 1, so that the speed of the grinding medium after being accelerated by the grinding block obtains components in the radial direction and the axial direction. By retracting the third side surfaces 113 of adjacent grinding blocks inward, the materials and grinding media near the third side surfaces 113 of the two groups of grinding blocks can be moved in the designed direction to achieve directional collision, greatly improving the collision frequency, accelerating the circulation rate of the grinding media in the grinding chamber, and reducing the accumulation dead zone of the grinding media on both sides of the material inlet and outlet of the grinding chamber, thereby achieving better grinding effect; the first protrusion 12 on the rotor structure 1 can disturb objects in the surrounding area, avoid the material and grinding media from sticking to the outer wall of the rotor structure 1 without participating in the collision movement, achieve the effect of dispersion and energization, and improve the uniformity of materials of various particle sizes in the grinding chamber 2, thereby improving the concentration of the particle size distribution of the material at the discharge port.

[0042] Optionally, the grinding block 11 and the rotor structure 1 of this embodiment can be connected by bolts and made of different materials to achieve detachability, low manufacturing difficulty and easy replacement after wear.

[0043] In an optional embodiment, the first protrusion 12 is a pair of elongated protrusions, and the orientations of the pair of elongated protrusions form a first angle. The projection of the bisector of the first angle on the outer wall surface of the rotor structure 1 is in the same direction as the circumferential direction of the rotor structure 1 on the outer wall surface. The tip of the first angle points to the third side surface 113 of the grinding block 11 adjacent to the first protrusion 12; the first angle is 60~150 degrees.

[0044] In this embodiment, see Figures 3 and 4When the material and the grinding medium pass through the first protrusion 12, a jet phenomenon is formed, which can quickly increase the movement speed of the material and the grinding medium in the fluid layer area on the outer wall of the rotor 1 and increase the intensity of the collision. At the same time, the accelerated material and the grinding medium just meet the third side surface 113 of the grinding block 3 in the direction of movement. The third side surface 113 can directionally push the material and the grinding medium with a higher flow rate to the surrounding area according to its direction, further energize the material and the grinding medium, increase the intensity of the collision in the surrounding area and the uniformity of the material, and shorten the circulation period of the grinding medium.

[0045] In yet another optional embodiment, the first angle is 90 degrees.

[0046] In another optional embodiment, the slope of the third side surface 113 is 20-70 degrees, and the slope is based on the tangential direction of the junction between the outer wall surface of the rotor structure 1 and the third side surface 113.

[0047] In another optional embodiment, among the grinding blocks 11 distributed axially on the outer wall surface of the rotor structure 1, the normal direction of the third side surface 113 of the grinding block 11 near the discharge port B intersects with the normal direction of the third side surface 113 of the grinding block 11 near the feed port C, and the intersection point is located between the two grinding blocks 11.

[0048] In another optional embodiment, the straight line projection of an arbitrary straight line across the width direction on the third side surface on the normal plane at the intersection of the third side surface and the outer wall surface of the rotor has an angle of 15 to 75 degrees between the projection of the straight line on the outer wall surface of the rotor structure and the projection of the central axis of the rotor structure on the outer wall surface.

[0049] In yet another alternative embodiment, see Figures 5 and 6 The grinding block 11 is provided with an elliptical second protrusion 13 on both the first side surface 111 and the second side surface 112. The second protrusion 13 is oriented at a second angle with the radial direction of the rotor, and the second angle is 15 to 75 degrees.

[0050] See also Figures 5 and 6 , Figure 6is the force applied by the second protrusion 13 when the rotor 1 rotates counterclockwise. In this embodiment, the extrusion and collision energizing surface is primarily the front surface of the grinding block 11, supplemented by the elliptical second protrusion 13. The friction and shear energizing surface is primarily the side surface of the grinding block 11, supplemented by the second protrusion 13. The elliptical second protrusion 13 increases the area of ​​the friction and shear energizing surface and the extrusion and collision energizing surface. On the other hand, through its oblique arrangement, it imparts a centrifugal motion trend to some grinding media when they come into contact with it. In addition, due to the different energizing paths, there is a significant speed difference between it and the grinding media on the outside of the grinding block 11, which is manifested as a difference in physical quantities such as velocity scalar, velocity direction, and rotational angular velocity. This can increase the collision frequency of the grinding media in the grinding area between the outside of the grinding block 11 and the inner wall of the grinding chamber 2.

[0051] In yet another optional embodiment, the second angle is 45 degrees.

[0052] In yet another alternative embodiment, see Figure 7 The grinding block 11 is provided with an elliptical second protrusion 13 on both the first side surface 111 and the second side surface 112 , and the direction of the second protrusion 13 is the same as the radial direction of the rotor.

[0053] In yet another optional embodiment, a plurality of through holes 14 are provided on the surface of the rotor structure 1 , and the through holes 14 are away from the second end 22 of the grinding chamber 2 .

[0054] See also Figure 8 In another optional embodiment, the projections of the inner wall surfaces of the through hole 14 on both sides of the rotor structure 1 in the axial direction on the radial cross section of the rotor structure 1 are two straight lines 141 and 142, and the angles 143 and 144 between the two straight lines and the radial direction on the radial cross section of the rotor structure 1 are 0~45 degrees and 0~45 degrees, respectively.

[0055] In another optional embodiment, the central angle between each grinding block 11 and the axially adjacent grinding block 11 is 22.5 to 60 degrees; wherein, the central angle takes the projection of the central axis of the rotor structure 1 on the radial section of the rotor structure 1 as the center of the circle, and connects the projection points of the center of gravity of the two grinding blocks 11 on the radial section of the rotor structure 1 respectively.

[0056] Example 2

[0057] See also Figures 9-11An embodiment of the present invention discloses an inner cylinder structure 3 of a horizontal sand mill, wherein the grinding chamber of the inner cylinder structure 3 is the grinding chamber 2 described in Example 1; a plurality of elliptical third protrusions 31 are provided on the inner wall surface of the inner cylinder structure 3; the orientation of each of the third protrusions 31 on the inner wall of the inner cylinder structure 3 forms a third angle with the axial direction of the inner cylinder structure 3, and the third angle is 15 to 75 degrees.

[0058] In this embodiment, a plurality of elliptical third protrusions 31 are provided on the inner wall surface of the inner cylinder structure 3. The third protrusions 31 are directed at a certain angle to the axial direction of the rotor structure 1, and adjacent third protrusions 31 are directed in opposite directions. This allows the grinding medium to obtain axial and radial components in its velocity after contact with the cylinder, thereby reducing the velocity synergy of the grinding medium between the outer side of the grinding block 11 and the inner wall of the inner cylinder structure 3, increasing the speed difference between the grinding media, and thereby increasing the collision frequency. The inward angle of the third protrusions 31 at both ends can cause the grinding media at both ends to move toward the middle and accelerate its circulation in the cylinder.

[0059] In an optional embodiment, a fourth angle exists between the orientations of each pair of adjacent third protrusions 31 on the inner wall of the inner cylinder structure 3, and the angle between the bisector of the fourth angle corresponding to at least one pair of adjacent third protrusions 31 and the circumferential tangent of the inner cylinder structure 3 is less than 10 degrees.

[0060] In another optional embodiment, the orientation of the third protrusion 31 near the feed port C and the orientation of the third protrusion 31 near the discharge port B form a fifth angle, and the angle between the bisector of the fifth angle and the circumferential tangent of the inner cylinder structure 3 is less than 10 degrees. This ensures that the two adjacent protrusions are at least non-parallel, thereby reducing the velocity synergy between the grinding media.

[0061] In another optional embodiment, the third protrusions 31 form a plurality of circumferential circles on the inner wall of the inner cylinder structure 3 that intersect perpendicularly with the axial direction of the inner cylinder structure 3 .

[0062] In another alternative embodiment, the third protrusions 31 are equidistant along the circumference of the inner wall of the inner cylinder structure 3, and are arranged alternatingly in the positive and negative directions of the third angle. In yet another alternative embodiment, the third protrusions 31 correspond to the grinding blocks 11, wherein the projection of each grinding block 11 on the inner wall of the inner cylinder structure 3 at a given moment coincides with the installation location of the corresponding third protrusion 31 of that grinding block. During design, it is optimal to position the third protrusion 31 directly above the grinding block 11, as the acceleration effect directly above the grinding block 11 is greater than that of the spaced-apart area, resulting in a better dispersion of the protrusions.

[0063] The contents disclosed in the embodiments of the present invention only disclose preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A rotor structure of a horizontal sand mill, wherein the main body of the rotor structure is a rotatable cylindrical structure with a plurality of grinding blocks provided on the outer wall thereof, the rotor structure being installed in a grinding chamber of the horizontal sand mill, the grinding chamber being a cylindrical structure with two ends; the discharge port of the horizontal sand mill is connected to the grinding chamber through the first end of the grinding chamber, and the feed port of the horizontal sand mill is connected to the grinding chamber through the second end of the grinding chamber; characterized in that A first protrusion is also provided on the outer wall surface of the rotor structure; The grinding blocks and the first protrusions are cross-arranged on the outer wall surface of the rotor structure along the circumferential and axial directions of the rotor structure, so that the grinding blocks are adjacent to the first protrusions in both the circumferential and axial directions of the rotor structure, and the first protrusions are adjacent to the grinding blocks in both the circumferential and axial directions of the rotor structure; The grinding block has four side surfaces and a top surface, wherein the first side surface faces the first end of the grinding chamber, the second side surface faces the second end of the grinding chamber, and the third side surface is a sloped surface and is obliquely facing the grinding block axially adjacent to the grinding block; Among the grinding blocks distributed along the axial direction on the outer wall surface of the rotor structure, the normal directions of the third side surfaces of at least one pair of adjacent grinding blocks intersect, and the intersection point is located between the pair of adjacent grinding blocks; The straight line projection of any straight line across the width direction on the third side surface on the normal plane at the intersection of the third side surface and the outer wall surface of the rotor structure, the angle between the projection of the straight line on the outer wall surface of the rotor structure and the projection of the central axis of the rotor structure on the outer wall surface is 15 to 75 degrees; The grinding block is provided with an elliptical second protrusion on both the first side surface and the second side surface; the direction of the second protrusion forms a second angle with the radial direction of the rotor, and the second angle is 15 to 75 degrees, or the direction of the second protrusion is in the same direction as the radial direction of the rotor.

2. The rotor structure according to claim 1, characterized in that: The first protrusion is a pair of long strip-shaped protrusions, and the orientation of the pair of long strip-shaped protrusions has a first angle. The projection of the bisector of the first angle on the outer wall surface of the rotor structure is in the same direction as the circumferential direction of the rotor structure on the outer wall surface. The tip of the first angle points to the third side surface of the grinding block circumferentially adjacent to the first protrusion; the first angle is 60~150 degrees.

3. The rotor structure according to claim 2, characterized in that: The first angle is 90 degrees.

4. The rotor structure according to claim 1, characterized in that: The slope of the third side surface is 20-70 degrees, and the slope is based on the tangential direction of the junction between the outer wall surface of the rotor structure and the third side surface.

5. The rotor structure according to claim 1, characterized in that: Among the grinding blocks distributed axially on the outer wall surface of the rotor structure, the normal direction of the third side surface of the grinding block near the discharge port intersects with the normal direction of the third side surface of the grinding block near the feed port, and the intersection point is located between the two grinding blocks.

6. The rotor structure according to claim 1, characterized in that: The second angle is 45 degrees.

7. An inner cylinder structure of a horizontal sand mill, characterized in that: The grinding chamber of the inner cylinder structure is the grinding chamber according to any one of claims 1 to 6; A plurality of elliptical third protrusions are provided on the inner wall surface of the inner cylinder structure; the orientation of each of the third protrusions on the inner wall of the inner cylinder structure forms a third angle with the axial direction of the inner cylinder structure, and the third angle is 20 to 70 degrees.

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