Grinding structure of horizontal sand mill

Abstract

The invention discloses a grinding structure of a horizontal sand mill. The grinding structure comprises a rotor and a grinding cylinder, a grinding block is arranged on the outer wall surface of the rotor; the rotor is arranged in an inner cavity of the grinding cylinder; the side face, facing the first end of the inner cavity, of the grinding block and the side face, facing the second end of the inner cavity, of the grinding block are each provided with an oval first protrusion. A first included angle is formed between the orientation of the first bulge and the radial direction of the rotor, and the first included angle is 15-75 degrees; a plurality of elliptical second bulges are arranged on the inner wall surface of the grinding cylinder; a second included angle is formed between the orientation of each second bulge on the inner wall of the grinding cylinder and the axial direction of the grinding cylinder, and the second included angle is 20-70 degrees; a third included angle exists between the orientations of each pair of axially adjacent second bulges on the inner wall of the grinding cylinder, and the included angle between the angular bisector of the third included angle corresponding to at least one pair of axially adjacent second bulges and the circumferential direction of the grinding cylinder is smaller than 10 degrees. According to the invention, the collision frequency of a grinding medium and a material can be improved, and a better grinding effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of horizontal sand mills, and in particular to a grinding 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 the rotor to rotate and collide. Due to the different specific gravities and hardnesses of materials and grinding media, materials will be ground and decomposed into tiny particles during the collision between them. However, when existing grinders are in operation, the grinding media is prone to uneven distribution and accumulation, resulting in insufficient grinding of materials. 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 cylinder and a rotatable rotor; the main body of the rotor is a cylinder, and a plurality of grinding blocks are arranged on its outer wall surface; the inner cavity of the grinding cylinder is a cylindrical structure with two ends, and the rotor is arranged in the inner cavity; the feed port of the horizontal sand mill is connected with the inner cavity through the first end of the inner cavity, and the discharge port of the horizontal sand mill is connected with the inner cavity through the second end of the inner cavity; it is characterized in that the grinding block is provided with an elliptical first protrusion on the side facing the first end of the inner cavity and the side facing the second end of the inner cavity; the first protrusion has 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 of the second protrusions 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 on the outer wall surface of the rotor along the circumferential and axial directions 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 a top surface, the sides provided with the first protrusion are respectively the first side surface and the second side surface, and the sides 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 far 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 implementation, 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 implementation, 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 of the first protrusions and the rotational circumferential direction 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 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 section of the rotor respectively.

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

[0016] 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 media be given a centrifugal movement 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 arranging the long strip protrusion 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 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 arranging the elliptical protrusion on the inner wall 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, the material and the grinding medium empowered by the grinding block are given axial and radial velocity components again, the relative collision and friction frequency between the grinding media is increased, and the grinding effect is further improved. 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 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 It is a schematic diagram of the force application 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 It 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 It 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 scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are 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 cylinder 2 and a rotatable rotor 1; the main body of the rotor 1 is a cylinder, and a plurality of grinding blocks 3 are arranged on the outer wall surface of the rotor 1; the inner cavity of the grinding cylinder 2 is a cylindrical structure with two ends, and the rotor 1 is arranged 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 the side of the first end facing the inner cavity and the side 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; a second angle is formed between the orientation of each second protrusion 23 on the inner wall of the grinding cylinder 2 and the axial direction of the grinding cylinder 2, 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 23 on the inner wall of the grinding cylinder 2, and an angle between the bisector of the third angle corresponding to at least one pair of adjacent second protrusions 23 and the circumferential plane of the grinding cylinder 2 is less than 10 degrees.

[0030] See also Figure 4 , 7The feed port A of the horizontal sand mill of this embodiment is arranged between the inner wall of the grinding cylinder 2 and the outer wall of the rotor 1, so that the material first enters the outer wall of the rotor 1 for grinding and then exits from the other end 22 of the grinding cylinder 2. The rotor 1 may be provided with a through hole 12 away from the feed port A, so that the material and the grinding medium (usually grinding balls) enter the rotor 1 from the outer wall for further grinding. The flow channel is a blank area on the rotor where no grinding block 3 is arranged, and the flow area is large, and the flow resistance of the material passing through the grinding block area is relatively low; the grinding blocks 3 are staggered, and the path of the material and the grinding medium is tortuous when they move along the axial direction of the rotor, which can also increase the grinding time of the material.

[0031] See also Figure 2 , 3 , Figure 3 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 movement 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 grinding medium can obtain axial and radial components in the speed after contacting the cylinder, reduce 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, increase the speed difference between the grinding media, and thus increase the collision frequency; the protrusions 23 at both ends are at an inward angle, so that the grinding media at both ends can move toward the middle to accelerate its 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 can not only increase 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, make part of the grinding media be given a centrifugal movement trend when contacting it, so that there is a more 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 arranging the elliptical protrusion on the inner wall surface of the grinding cylinder, it is avoided that the grinding media 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 media 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 the present 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 yet 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 the grinding medium flow through the third protrusion 11, a vortex occurs, and a vortex is formed during separation, which can disturb the material in the surrounding area, and can prevent the material and the grinding medium from sticking to the outer wall of the rotor without participating in the collision movement, thereby improving the uniformity of the material in the grinding area, and thus improving the grinding capture frequency of materials of different particle sizes during grinding. At the same time, the disturbed material and the grinding medium just meet the slope 34 of the grinding block 3 in the direction of movement, and the slope 34 can push the material and the grinding medium to a larger area around to further increase the collision frequency. By arranging the long strip protrusion 11 on the outer wall of the rotor, the dynamic pressure of the material in the area near the outer wall of the rotor 1 can be increased, the mixing uniformity of the material in the grinding chamber 2 can be improved, the particle size distribution range of the material after grinding can be reduced, and the grinding effect can be improved.

[0039] In another optional embodiment, the grinding block 3 has four side surfaces and a 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 yet 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 junction 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, and 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 chamber 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 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 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 of the first protrusions 31 and the rotation circumferential direction 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 radial outward movement velocity component.

[0046] In yet 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 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 section of the rotor respectively.

[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 optional embodiment, the second protrusion 23 corresponds to the grinding block 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 position of the second protrusion corresponding to the grinding block. When designing, it is best for the protrusion 23 to be located directly above the grinding block, because the acceleration effect at the directly above position is better than that at the interval area, and the protrusion has a better dispersion effect.

[0050] The contents disclosed in the embodiments of the present invention only disclose the 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 may still be modified, or some of the technical features thereof may 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 embodiments of the present invention.

Claims

1. A grinding structure of a horizontal sand mill, comprising a grinding cylinder and a rotatable rotor; the main body of the rotor is a cylinder, and a plurality of grinding blocks are arranged on the outer wall surface of the rotor; the inner cavity of the grinding cylinder is a cylindrical structure with two ends, and the rotor is arranged 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 the side of the first end facing the inner cavity and the side 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; a second angle is formed between the orientation of each of the second protrusions 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.

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 also 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 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.

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

7. The grinding structure according to claim 1, characterized in that: A plurality of through holes are arranged on the surface of the rotor, and the through holes are far 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 vicinity of the second end of the grinding 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 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.

9. The grinding structure according to claim 1, characterized in that: 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 of the first protrusions and the rotation 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 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 section of the rotor respectively.

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