Grinding structure of a horizontal sand mill

Abstract

The present invention discloses a grinding structure for a horizontal sand mill, comprising a rotor and a grinding drum. The rotor is provided with a grinding block on its outer wall. The rotor is disposed in the inner cavity of the grinding drum. The grinding block is provided with an elliptical first protrusion on both the side surface of the first end facing the inner cavity and the side surface of the second end facing the inner cavity. The first protrusion is oriented at a first angle with the radial direction of the rotor, and the first angle is 15 to 75 degrees. The inner wall of the grinding drum is provided with a plurality of elliptical second protrusions. Each second protrusion on the inner wall of the grinding drum is oriented at a second angle with the axial direction of the grinding drum, and the second angle is 20 to 70 degrees. Each pair of axially adjacent second protrusions on the inner wall of the grinding drum is oriented at a third angle, and the angle bisector of the third angle corresponding to at least one pair of axially adjacent second protrusions is less than 10 degrees with the circumferential direction of the grinding drum. The present invention can increase the collision frequency between the grinding medium and the material, thereby achieving a better grinding effect.

Description

Technical Field

[0001] The invention relates to the technical field of horizontal sand mills, in particular to a grinding structure of a horizontal sand mill. Background Art

[0002] A sand mill is a machine that grinds material and grinding media within a grinding chamber by driving a rotor to cause them to rotate and collide. Due to the different specific gravities and hardnesses of the material and grinding media, the collision between the two grinders grinds the material into tiny particles. However, existing grinders often experience uneven distribution and accumulation of the grinding media during operation, resulting in inadequate grinding of the material. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a grinding structure of a horizontal sand mill, which can increase the effective area of ​​the friction shear empowering surface and the extrusion collision empowering surface, improve the mixing uniformity of the grinding material in the grinding chamber, and increase the collision frequency of the grinding medium in the grinding area between the outer side of the grinding block and the inner wall of the grinding cylinder, so as to obtain a better grinding effect.

[0004] In order to solve the above technical problems, the first aspect of the present invention discloses a grinding structure of a horizontal sand mill, comprising a grinding drum and a rotatable rotor; the main body of the rotor is a cylinder, and a plurality of grinding blocks are provided on the outer wall surface of the rotor; the inner cavity of the grinding drum is a cylindrical structure with two ends, and the rotor is provided in the inner cavity; the feed port of the horizontal sand mill is connected to the inner cavity through the first end of the inner cavity, and the discharge port of the horizontal sand mill is connected to the inner cavity through the second end of the inner cavity; the grinding blocks are provided with first elliptical protrusions on the side facing the first end of the inner cavity and the side facing the second end of the inner cavity; the first protrusions are oriented at a first angle with the circumferential radial direction of the rotor, and the first angle is 15 to 75 degrees;

[0005] A plurality of elliptical second protrusions are provided on the inner wall surface of the grinding cylinder; a second angle is formed between the orientation of each second protrusion on the inner wall of the grinding cylinder and the axial direction of the grinding cylinder, and the second angle is 20 to 70 degrees; a third angle is formed between the orientations of each pair of axially adjacent second protrusions on the inner wall of the grinding cylinder, and the angle between the bisector of the third angle corresponding to at least one pair of adjacent second protrusions and the circumferential plane of the grinding cylinder is less than 10 degrees.

[0006] As an optional embodiment, there is a fourth angle between the orientation of the second protrusion near the feed port and the orientation of the second protrusion near the discharge port, and the angle between the bisector of the fourth angle and the circumferential plane of the grinding cylinder is less than 10 degrees.

[0007] As another optional implementation, a third elongated protrusion is further provided on the outer wall surface of the rotor; the direction of the third protrusion is the same as the axial direction of the rotor.

[0008] As another optional embodiment, the grinding block and the third protrusion are cross-arranged along the circumferential and axial directions of the rotor on the outer wall surface of the rotor, so that the grinding block is adjacent to the third protrusion in both the circumferential and axial directions of the rotor, and the third protrusion is adjacent to the grinding block in both the circumferential and axial directions of the rotor.

[0009] As another optional embodiment, the grinding block has four side surfaces and one top surface, the side surfaces provided with the first protrusion are respectively the first side surface and the second side surface, and the side surfaces facing the circumferentially adjacent third protrusion are respectively the third side surface and the fourth side surface; at least one of the third side surface and the fourth side surface of the grinding block is a slope surface.

[0010] As another optional implementation, the slope of the slope is 20 to 70 degrees, and the slope is based on the tangential direction of the intersection of the outer wall of the rotor and the slope.

[0011] As another optional embodiment, a plurality of through holes are provided on the surface of the rotor, and the through holes are away from the first end of the inner cavity, and the through holes are used for material discharge and local circulation of grinding media in the area near the second end of the grinding cavity.

[0012] As another optional embodiment, the projections of the inner wall surfaces of the through hole on both sides of the rotor axial direction on the radial section of the rotor are two straight lines, and the angles between the two straight lines and the radial direction on the radial section of the rotor are both 0 to 45 degrees.

[0013] As another optional embodiment, the projection of the first protrusions arranged in the same circumferential direction on the radial cross section of the rotor is an annular array, and the angle between the orientation of each first protrusion and the rotational circumference of the rotor is an acute angle.

[0014] As another optional embodiment, the central angle between each grinding block and the axially adjacent grinding block is 22.5 to 60 degrees; wherein, the central angle takes the projection of the central axis of the rotor on the radial cross-section of the rotor as the center of the circle, and connects the projection points of the center of gravity of the two grinding blocks on the radial cross-section of the rotor.

[0015] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0016] The embodiment of the present invention provides elliptical protrusions on the grinding block, which not only increases the effective area of ​​the friction shear empowering surface and the extrusion collision empowering surface of the grinding block, but also, through the oblique arrangement, gives part of the grinding media a centrifugal motion tendency when contacting it, so that there is a relatively obvious speed difference between it and the grinding media on the outside of the grinding block, thereby increasing the collision frequency of the grinding media in the grinding area between the outside of the grinding block and the inner wall of the grinding cylinder, and obtaining a better grinding effect; by providing long strip-shaped protrusions on the outer wall of the rotor, the dynamic pressure of the material in the area near the outer wall of the rotor is increased, the degree of mixing uniformity of the material in the grinding chamber is improved, the particle size distribution range of the material after grinding is narrowed, and the grinding effect is improved; by providing elliptical protrusions on the inner wall of the grinding cylinder, the grinding media is prevented from moving at the same speed as the wall without effective collision, and cooperates with the grinding block and the protrusions thereon to give the material and grinding media energized by the grinding block axial and radial velocity components again, thereby increasing the relative collision and friction frequency between the grinding media, and further improving the grinding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a structural schematic diagram of a grinding structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0019] Figure 2 1 is another structural schematic diagram of a grinding structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the force direction of the first protrusion when the rotor of a horizontal sand mill disclosed in an embodiment of the present invention rotates counterclockwise;

[0021] Figure 4 It is a structural schematic diagram of a rotor in a grinding structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0022] Figure 5 This is another structural schematic diagram of a rotor in a grinding structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0023] Figure 6 It is a structural schematic diagram of a grinding cylinder in a grinding structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0024] Figure 7 This is another structural schematic diagram of a grinding cylinder in a grinding structure of a horizontal sand mill disclosed in an embodiment of the present invention;

[0025] Figure 8 It is a schematic diagram of the radial cross-sectional structure of a rotor in a grinding structure of a horizontal sand mill disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] See also Figures 1 to 8 The embodiment of the present invention discloses a grinding structure of a horizontal sand mill, comprising a grinding drum 2 and a rotatable rotor 1; the rotor 1 is a cylindrical body with a plurality of grinding blocks 3 provided on its outer wall; the inner cavity of the grinding drum 2 is a cylindrical structure with two ends, and the rotor 1 is disposed in the inner cavity; the feed port A of the horizontal sand mill is connected to the inner cavity through the first end 21 of the inner cavity, and the discharge port B of the horizontal sand mill is connected to the inner cavity through the second end 22 of the inner cavity; wherein:

[0028] The grinding block 3 is provided with an elliptical first protrusion 31 on both the side surface of the first end facing the inner cavity and the side surface of the second end facing the inner cavity; the first protrusion 31 is oriented at a first angle with the circumferential radial direction of the rotor 1, and the first angle is 15 to 75 degrees;

[0029] A plurality of elliptical second protrusions 23 are provided on the inner wall surface of the grinding cylinder 2; the orientation of each second protrusion 23 on the inner wall of the grinding cylinder 2 forms a second angle with the axial direction of the grinding cylinder 2, and the second angle is 20 to 70 degrees; the orientations of each pair of axially adjacent second protrusions 23 on the inner wall of the grinding cylinder 2 form a third angle, and the angle bisector of the third angle corresponding to at least one pair of adjacent second protrusions 23 is less than 10 degrees with the circumferential plane of the grinding cylinder 2.

[0030] See also Figure 4 、 7The feed inlet A of the horizontal sand mill of this embodiment is positioned between the inner wall of the grinding drum 2 and the outer wall of the rotor 1. This allows the material to enter the outer wall of the rotor 1 for grinding before exiting through the other end 22 of the grinding drum 2. A through-hole 12 can be provided in the rotor 1 away from the feed inlet A, allowing the material and grinding media (typically grinding balls) to enter the rotor 1 from the outer wall for further grinding. The flow channel, which is the blank area on the rotor without the grinding blocks 3, has a large flow area, and the flow resistance of the material through the grinding block area is relatively low. The staggered arrangement of the grinding blocks 3 creates a tortuous path for the material and grinding media as they move along the axial direction of the rotor, which also increases the grinding time of the material.

[0031] See also Figure 2 、 3 , Figure 3 It is the force direction of the first protrusion 31 when the rotor 1 rotates counterclockwise. In this embodiment, the extrusion and collision empowering surface is mainly the top surface of the grinding block 3, supplemented by the elliptical first protrusion 31, and the friction and shear empowering surface is mainly the side surface of the grinding block 3, supplemented by the first protrusion 31. On the one hand, the elliptical first protrusion 31 increases the area of ​​the friction and shear empowering surface and the extrusion and collision empowering surface. On the other hand, through the oblique arrangement, part of the grinding media is given a centrifugal motion trend when it contacts it. In addition, due to the different empowering paths, there is a relatively obvious speed difference between it and the grinding media on the outside of the grinding block 3, which is manifested as the difference in physical quantities such as speed scalar, speed direction and rotation angular velocity, thereby increasing the collision frequency of the grinding media in the grinding area between the outside of the grinding block 3 and the inner wall of the grinding cylinder 2.

[0032] See also Figure 6 、 7 A plurality of elliptical second protrusions 23 are provided on the inner wall surface of the grinding cylinder 2. The protrusions 23 are at a certain angle to the axial direction of the rotor 1 and the adjacent protrusions 23 are in opposite directions, so that the speed of the grinding medium obtains axial and radial components after contacting the cylinder, reducing the speed synergy of the grinding medium between the outer side of the grinding block 3 and the inner wall of the grinding cylinder 2, increasing the speed difference between the grinding media, and thus increasing the collision frequency; the protrusions 23 at both ends are at an inward angle, so that the grinding media at both ends move toward the middle to accelerate their circulation, and avoid the accumulation of grinding media in the dead zone at both ends of the grinding chamber.

[0033] It can be seen that the embodiment of the present invention not only increases the effective area of ​​the friction shear empowering surface and the extrusion collision empowering surface of the grinding block by arranging the elliptical protrusion on the grinding block, but also, through the oblique arrangement, makes part of the grinding medium be given a centrifugal movement trend when in contact with it, so that there is a more obvious speed difference between it and the grinding medium on the outside of the grinding block, thereby increasing the collision frequency of the grinding medium in the grinding area between the outside of the grinding block and the inner wall of the grinding cylinder, and obtaining a better grinding effect; by arranging the elliptical protrusion on the inner wall surface of the grinding cylinder, it is avoided that the grinding medium moves at the same speed as the wall surface without effective collision, and cooperates with the grinding block and the protrusion thereon, so that the material and the grinding medium empowered by the grinding block are given axial and radial velocity components again, thereby increasing the relative collision and friction frequency between the grinding media, and further improving the grinding effect.

[0034] Optionally, the grinding block 3 and the rotor 1 of this embodiment can be connected by bolts to achieve detachability, low manufacturing difficulty and simple replacement after wear.

[0035] In an optional embodiment, there is a fourth angle between the orientation of the second protrusion 23 near the feed port A and the orientation of the second protrusion 23 near the discharge port B, and the angle between the bisector of the fourth angle and the circumferential plane of the grinding cylinder 2 is less than 10 degrees.

[0036] In another optional embodiment, a third elongated protrusion 11 is further provided on the outer wall surface of the rotor 1 ; the direction of the third protrusion 11 is in the same direction as the axial direction of the rotor 1 .

[0037] In another optional embodiment, the grinding block 3 and the third protrusion 11 are cross-arranged on the outer wall surface of the rotor 1 along the circumferential and axial directions of the rotor 1, so that the grinding block 3 is adjacent to the third protrusion 11 in both the circumferential and axial directions of the rotor 1, and the third protrusion 11 is adjacent to the grinding block 3 in both the circumferential and axial directions of the rotor 1.

[0038] In this embodiment, see Figure 5 When the material and grinding media flow through the third protrusion 11, a vortex forms during separation, disturbing the material in the surrounding area. This prevents the material and grinding media from sticking to the rotor's outer wall and not participating in the collision motion, improving the uniformity of the material in the grinding area and, in turn, increasing the grinding capture frequency of materials of different particle sizes during grinding. Simultaneously, the disturbed material and grinding media collide with the slope 34 of the grinding block 3 in the direction of motion. The slope 34 pushes the material and grinding media to a wider surrounding area, further increasing the collision frequency. Providing the elongated protrusions 11 on the rotor's outer wall increases the dynamic pressure of the material in the area near the outer wall of the rotor 1, improving the uniformity of material mixing within the grinding chamber 2, narrowing the particle size distribution range of the ground material, and improving the grinding effect.

[0039] In another optional embodiment, the grinding block 3 has four side surfaces and one top surface, the sides provided with the first protrusion 31 are respectively the first side surface 32 and the second side surface 33, and the sides facing the circumferentially adjacent third protrusion 11 are respectively the third side surface and the fourth side surface; at least one of the third side surface and the fourth side surface of the grinding block 3 is a slope surface 34.

[0040] In another optional embodiment, the slope of the slope surface 34 is 20 to 70 degrees, and the slope is based on the tangential direction of the intersection between the outer wall surface of the rotor 1 and the slope surface 34.

[0041] In another optional embodiment, a plurality of through holes 12 are provided on the surface of the rotor 1, and the through holes 12 are away from the first end of the inner cavity. The through holes 12 are used for material discharge and local circulation of grinding media in the area near the second end of the grinding cavity 2.

[0042] See also Figure 8 In another optional embodiment, the projections of the inner wall surfaces of the through hole 12 on both sides of the rotor 1 in the axial direction on the radial cross section of the rotor 1 are two straight lines 121 and 122, and the angles 123 and 124 between the two straight lines and the radial direction on the radial cross section of the rotor 1 are both 0 to 45 degrees.

[0043] In yet another optional embodiment, the first angle is 45 degrees.

[0044] In another optional embodiment, the projection of the first protrusions 31 arranged in the same circumferential direction on the radial cross section of the rotor 1 is an annular array, and the angle between the orientation of each first protrusion 31 and the rotational circumference of the rotor 1 is an acute angle.

[0045] See also Figure 2 、 3 In the figure, the rotor 1 rotates counterclockwise, and the projection of each first protrusion 31 gradually changes its direction in a clockwise or counterclockwise direction along the annular array based on the center point of the projection of the first protrusion 31, so that the side of each first protrusion 31 facing the inner wall of the grinding cylinder 2 has an outward angle, which can give the grinding medium and the material a radially outward movement velocity component.

[0046] In another optional embodiment, the rotation direction of the rotor 1 matches the orientation of the first protrusion 31 , so that the grinding medium has an outward centrifugal movement tendency after being energized by the first protrusion 31 .

[0047] In another optional embodiment, the central angle between each grinding block and the axially adjacent grinding block is 22.5 to 60 degrees; wherein, the central angle takes the projection of the central axis of the rotor on the radial cross-section of the rotor as the center of the circle, and connects the projection points of the center of gravity of the two grinding blocks on the radial cross-section of the rotor.

[0048] In yet another optional embodiment, the second protrusions 23 form a plurality of circumferential circles on the inner wall of the grinding cylinder 2 that intersect perpendicularly with the axial direction of the grinding cylinder 2 .

[0049] In another alternative embodiment, the second protrusions 23 correspond to the grinding blocks 3, wherein the projection of each grinding block 3 on the inner wall of the grinding cylinder 2 at a certain moment coincides with the installation location of the corresponding second protrusion. During design, it is optimal to position the protrusions 23 directly above the grinding blocks because the acceleration effect directly above the grinding blocks is greater than that in the spaced-apart areas, and the protrusions provide better dispersion.

[0050] 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 grinding structure of a horizontal sand mill, comprising a grinding drum and a rotatable rotor; the main body of the rotor is a cylinder with a plurality of grinding blocks provided on its outer wall; the inner cavity of the grinding drum is a cylindrical structure with two ends, and the rotor is provided in the inner cavity; the feed port of the horizontal sand mill is connected to the inner cavity through the first end of the inner cavity, and the discharge port of the horizontal sand mill is connected to the inner cavity through the second end of the inner cavity; characterized in that The grinding block is provided with an elliptical first protrusion on both the side surface of the first end facing the inner cavity and the side surface of the second end facing the inner cavity; the first protrusion is oriented at a first angle with the circumferential radial direction of the rotor, and the first angle is 15 to 75 degrees; A plurality of elliptical second protrusions are provided on the inner wall surface of the grinding cylinder; each second protrusion on the inner wall of the grinding cylinder forms a second angle with the axial direction of the grinding cylinder, and the second angle is 20 to 70 degrees; each pair of axially adjacent second protrusions on the inner wall of the grinding cylinder forms a third angle with the axial direction of the grinding cylinder, and the angle bisector of the third angle corresponding to at least one pair of adjacent second protrusions is less than 10 degrees with the circumferential plane of the grinding cylinder.

2. The grinding structure according to claim 1, characterized in that: There is a fourth angle between the orientation of the second protrusion near the feed port and the orientation of the second protrusion near the discharge port, and the angle between the bisector of the fourth angle and the circumferential plane of the grinding cylinder is less than 10 degrees.

3. The grinding structure according to claim 1, characterized in that A third elongated protrusion is further provided on the outer wall surface of the rotor; the direction of the third protrusion is the same as the axial direction of the rotor.

4. The grinding structure according to claim 3, characterized in that: The grinding block and the third protrusion are cross-arranged along the circumferential and axial directions of the rotor on the outer wall surface of the rotor, so that the grinding block is adjacent to the third protrusion in both the circumferential and axial directions of the rotor, and the third protrusion is adjacent to the grinding block in both the circumferential and axial directions of the rotor.

5. The grinding structure according to claim 4, characterized in that: The grinding block has four side surfaces and a top surface, the side surfaces provided with the first protrusion are the first side surface and the second side surface, and the side surfaces facing the circumferentially adjacent third protrusion are the third side surface and the fourth side surface; at least one of the third side surface and the fourth side surface of the grinding block is a slope surface.

6. The grinding structure according to claim 5, characterized in that: The slope of the slope is 20-70 degrees, and the slope is based on the tangential direction of the intersection of the outer wall of the rotor and the slope.

7. The grinding structure according to claim 1, characterized in that: A plurality of through holes are provided on the surface of the rotor, and the through holes are away from the first end of the inner cavity. The through holes are used for material discharge and local circulation of grinding media in the area near the second end of the inner cavity.

8. The grinding structure according to claim 7, characterized in that: The projections of the inner wall surfaces of the through hole on both sides of the rotor axial direction on the radial cross section of the rotor are two straight lines, and the angles between the two straight lines and the radial direction on the radial cross section of the rotor are both 0-45 degrees.

9. The grinding structure according to claim 1, characterized in that: The projections of the first protrusions arranged in the same circumferential direction on the radial cross section of the rotor form an annular array, and the angle between the orientation of each first protrusion and the rotational circumferential direction of the rotor is an acute angle.

10. The grinding structure according to claim 1, characterized in that: The central angle between each grinding block and the axially adjacent grinding block is 22.5 to 60 degrees; wherein, the central angle takes the projection of the central axis of the rotor on the radial cross-section of the rotor as the center of the circle, and connects the projection points of the center of gravity of the two grinding blocks on the radial cross-section of the rotor.

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