Grinding structure of horizontal sand mill
By setting elliptical protrusions on the grinding blocks and inner walls of the grinding cylinder in a horizontal sand mill, the problem of uneven distribution of grinding media is solved, the collision frequency of grinding media and the mixing uniformity of materials are improved, and a better grinding effect is achieved.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- DONGGUAN LONGLY MASCH CO LTD
- Filing Date
- 2025-08-20
- Publication Date
- 2026-05-15
AI Technical Summary
In existing horizontal sand mills, the grinding media are easily unevenly distributed, resulting in insufficient grinding of materials and poor grinding effect.
Elliptical protrusions are set on the inner wall of the grinding block and grinding cylinder, and the effect area of the friction shearing and extrusion collision energy surface is increased by oblique arrangement, which gives the grinding media a centrifugal motion tendency, improves the collision frequency of the grinding media and the mixing uniformity of the material.
By increasing the collision frequency of the grinding media and the mixing uniformity of the materials, the grinding effect was significantly improved, and the particle size distribution range of the ground materials was reduced.
Smart Images
Figure CN2025115890_15052026_PF_FP_ABST
Abstract
Description
A grinding structure for a horizontal sand mill
[0001] Cross-reference to related applications
[0002] This disclosure claims priority to Chinese Patent Application No. 202411568318X, filed on November 5, 2024, entitled “A Grinding Structure for a Horizontal Sand Mill”, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This disclosure relates to the field of horizontal sand mill technology, and more particularly to a grinding structure for a horizontal sand mill. Background Technology
[0004] A sand mill is a machine that grinds materials and grinding media by causing them to rotate and collide within a grinding chamber using a rotor. Due to the differences in specific gravity and hardness between the materials and the grinding media, the materials are ground and broken down into tiny particles during the collision process. However, in existing mills, the grinding media are prone to uneven distribution and accumulation during operation, resulting in the materials not being fully ground.
[0005] Public content
[0006] The technical problem to be solved by this disclosure is to provide a grinding structure for a horizontal sand mill that can increase the effective area of the friction shearing and extrusion collision energizing surfaces, improve the mixing uniformity of the grinding material in the grinding chamber, increase the collision frequency of the grinding media in the grinding area between the outer side of the grinding block and the inner wall of the grinding cylinder, and obtain a better grinding effect.
[0007] To address the aforementioned technical problems, the first aspect of this disclosure provides a grinding structure for a horizontal sand mill, comprising a grinding cylinder and a rotatable rotor; the rotor's main body is a cylinder with multiple grinding blocks on its outer wall; the inner cavity of the grinding cylinder is a cylindrical structure with two ends, and the rotor is disposed within the inner cavity; the feed inlet of the horizontal sand mill communicates with the inner cavity through a first end, and the discharge outlet of the horizontal sand mill communicates with the inner cavity through a second end; wherein, each grinding block has an elliptical first protrusion on both its side facing the first end and its side facing the second end; the orientation of the first protrusion forms a first angle with the radial direction of the rotor's circumference, and the first angle is 15 to 75 degrees;
[0008] The inner wall of the grinding cylinder is provided with a plurality of elliptical second protrusions; the orientation of each second protrusion on the inner wall of the grinding cylinder has a second included angle with the axial direction of the grinding cylinder, and the second included angle is 20 to 70 degrees; the orientation of each pair of axially adjacent second protrusions on the inner wall of the grinding cylinder has a third included angle, and the angle bisector of the third included angle corresponding to at least one pair of adjacent second protrusions has an angle of less than 10 degrees with the circumferential plane of the grinding cylinder.
[0009] Optionally, the orientation of the second protrusion near the feed inlet and the orientation of the second protrusion near the discharge outlet form a fourth angle, and the angle between the bisector of the fourth angle and the circumferential plane of the grinding cylinder is less than 10 degrees.
[0010] Optionally, the outer wall of the rotor is further provided with a long strip-shaped third protrusion; the orientation of the third protrusion is the same as that of the rotor axis.
[0011] Optionally, the grinding block and the third protrusion are arranged crosswise on the outer wall surface of the rotor along the circumferential and axial directions of the rotor, such 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.
[0012] Optionally, the grinding block has four sides and a top surface, with the sides having a first protrusion being the first side and the second side, and the sides facing the circumferentially adjacent third protrusion being the third side and the fourth side; at least one of the third side and the fourth side of the grinding block is a slope.
[0013] Optionally, the slope of the slope is 20 to 70 degrees, and the slope is based on the tangential direction at the junction of the outer wall of the rotor and the slope.
[0014] Optionally, the rotor has a plurality of through holes on its surface, and the through holes are located away from the first end of the inner cavity. The through holes are configured to discharge material and allow for local circulation of the grinding media in the area near the second end of the grinding cavity.
[0015] Optionally, the projections of the through hole onto the inner wall surfaces on both sides of the rotor in the axial direction and onto the radial section of the rotor are two straight lines, and the angles between these two straight lines and the radial direction on the radial section of the rotor are 0 to 45 degrees.
[0016] Optionally, the projection of the first protrusions arranged in the same circumference onto the radial section of the rotor is a ring array, and the angle between the orientation of each first protrusion and the rotational circumference of the rotor is an acute angle.
[0017] Optionally, the central angle between each of the grinding blocks and the axially adjacent grinding block is 22.5 to 60 degrees; wherein, the central angle is centered on the projection of the central axis of the rotor onto the radial section of the rotor, and connects the projection points of the centroids of the two grinding blocks onto the radial section of the rotor.
[0018] Compared with the prior art, the embodiments disclosed herein have the following beneficial effects:
[0019] This embodiment of the invention, by setting elliptical protrusions on the grinding block, not only increases the effective area of the frictional shearing and extrusion collision energizing surfaces of the grinding block, but also, through oblique arrangement, imparts a centrifugal motion tendency to some of the grinding media when in contact with it, resulting in a more significant velocity difference between it and the grinding media on the outside of the grinding block. This increases 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, resulting in a better grinding effect. By setting elongated 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, improving the mixing uniformity of the material in the grinding chamber, reducing the particle size distribution range of the material after grinding, and improving the grinding effect. By setting elliptical protrusions on the inner wall of the grinding cylinder, the grinding media are prevented from moving at the same speed along the wall without effective collision. In conjunction with the grinding block and its protrusions, the material and grinding media energized by the grinding block are again given axial and radial velocity components, increasing the probability of relative collision and friction between the grinding media, further improving the grinding effect. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 is a first-view structural schematic diagram of the grinding structure of a horizontal sand mill disclosed in an embodiment of this disclosure;
[0022] Figure 2 is a second-view structural schematic diagram of the grinding structure of a horizontal sand mill disclosed in an embodiment of this disclosure;
[0023] Figure 3 is a schematic diagram of the force direction of the first protrusion when the rotor of a horizontal sand mill disclosed in this embodiment rotates counterclockwise;
[0024] Figure 4 is a schematic diagram of the rotor in the grinding structure of a horizontal sand mill disclosed in this embodiment of the present disclosure from a first-view perspective.
[0025] Figure 5 is a schematic diagram of the rotor from a second perspective in the grinding structure of a horizontal sand mill disclosed in an embodiment of this disclosure;
[0026] Figure 6 is a schematic diagram of the grinding cylinder in the grinding structure of a horizontal sand mill disclosed in an embodiment of this disclosure;
[0027] Figure 7 is another structural schematic diagram of the grinding cylinder in the grinding structure of a horizontal sand mill disclosed in an embodiment of this disclosure;
[0028] Figure 8 is a schematic diagram of the radial cross-sectional structure of the rotor in the grinding structure of a horizontal sand mill disclosed in an embodiment of this disclosure. Detailed Implementation
[0029] To enable those skilled in the art to better understand the present disclosure, the technical solutions of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present disclosure, and not all embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present disclosure.
[0030] Referring to Figures 1-8, this disclosure presents a grinding structure for a horizontal sand mill, including a grinding cylinder 2 and a rotatable rotor 1. The rotor 1 has a cylindrical body with multiple grinding blocks 3 on its outer wall. The inner cavity of the grinding cylinder 2 is a cylindrical structure with two ends, and the rotor 1 is disposed within the inner cavity. The feed inlet A of the horizontal sand mill is connected to the inner cavity through a first end 21, and the discharge outlet B of the horizontal sand mill is connected to the inner cavity through a second end 22.
[0031] The grinding block 3 has an elliptical first protrusion 31 on both the side facing the first end of the inner cavity and the side facing the second end of the inner cavity; the orientation of the first protrusion 31 has a first angle with the circumferential radial direction of the rotor 1, and the first angle is 15 to 75 degrees.
[0032] The inner wall of the grinding cylinder 2 is provided with a plurality of elliptical second protrusions 23; the orientation of each second protrusion 23 on the inner wall of the grinding cylinder 2 has a second included angle with the axial direction of the grinding cylinder 2, and the second included angle is 20 to 70 degrees; the orientation of each pair of axially adjacent second protrusions 23 on the inner wall of the grinding cylinder 2 has a third included angle, and the angle bisector of the third included 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.
[0033] Referring to Figures 4 and 7, in this embodiment, the feed inlet A of the horizontal sand mill is located between the inner wall of the grinding cylinder 2 and the outer wall of the rotor 1. This allows the material to first enter the outer wall of the rotor 1 for grinding and then exit from the other end 22 of the grinding cylinder 2. The rotor 1 can have a through hole 12 located away from the feed inlet A, allowing the material and grinding media (usually grinding balls) to enter the interior of the rotor 1 from the outer wall for further grinding. The flow channel is the blank area on the rotor where the grinding blocks 3 are not located. This provides a large flow area and relatively low flow resistance for the material passing through the grinding block area. The staggered distribution of the grinding blocks 3 causes the material and grinding media to move along the axial direction of the rotor in a tortuous path, which can also increase the grinding time of the material.
[0034] Referring to Figures 2 and 3, Figure 3 shows the force direction of the first protrusion 31 when the rotor 1 rotates counterclockwise. In this embodiment, the top surface of the grinding block 3 is the main surface of the extrusion collision, and the elliptical first protrusion 31 is the auxiliary surface. The side surface of the grinding block 3 is the main surface of the friction shearing, and the first protrusion 31 is the auxiliary surface. The elliptical first protrusion 31 increases the area of the friction shearing and extrusion collision extrusion surfaces. On the other hand, by arranging it obliquely, some of the grinding media is given a centrifugal motion tendency when it comes into contact with it. In addition, due to the different extrusion 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. This can increase 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.
[0035] Referring to Figures 6 and 7, the inner wall of the grinding cylinder 2 is provided with multiple elliptical second protrusions 23. The protrusions 23 face each other at a certain angle to the axial direction of the rotor 1 and the adjacent protrusions 23 face opposite directions. This allows the grinding medium to obtain axial and radial components in its velocity after contacting the cylinder, reducing the velocity coordination between the outer side of the grinding block 3 and the inner wall of the grinding cylinder 2, increasing the velocity difference between the grinding media, and thus increasing the collision frequency. The protrusions 23 at both ends face inward, which allows the grinding media at both ends to move towards the middle to accelerate its circulation and avoid the accumulation of grinding media in the dead zone at both ends of the grinding chamber.
[0036] As can be seen, by setting elliptical protrusions on the grinding block, this embodiment not only increases the effective area of the frictional shearing and extrusion collision energizing surfaces of the grinding block, but also, through oblique arrangement, imparts a centrifugal motion tendency to some of the grinding media when in contact with it, resulting in a more significant velocity difference between it and the grinding media on the outside of the grinding block. This increases 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, thus achieving a better grinding effect. By setting elliptical protrusions on the inner wall of the grinding cylinder, the grinding media are prevented from moving at the same speed along the wall without effective collision. In conjunction with the grinding block and its protrusions, the material and grinding media energized by the grinding block are again given axial and radial velocity components, increasing the relative collision and friction probability between the grinding media and further improving the grinding effect.
[0037] Optionally, in this embodiment, the grinding block 3 and the rotor 1 can be connected by bolts to achieve detachability, which is easy to manufacture and easy to replace after wear.
[0038] Optionally, the orientation of the second protrusion 23 near the feed inlet A and the orientation of the second protrusion 23 near the discharge outlet B are at a fourth angle, and the angle between the bisector of the fourth angle and the circumferential plane of the grinding cylinder 2 is less than 10 degrees.
[0039] Optionally, the outer wall of the rotor 1 is further provided with a long strip-shaped third protrusion 11; the orientation of the third protrusion 11 is the same as the axial direction of the rotor 1.
[0040] Optionally, the grinding block 3 and the third protrusion 11 are arranged crosswise 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.
[0041] In this embodiment, referring to Figure 5, when the material and grinding media flow past the third protrusion 11, a flow-around phenomenon occurs, forming a vortex upon separation. This vortex disturbs the surrounding material, preventing it from adhering to the outer wall of the rotor and failing to participate in collision motion. This improves the uniformity of the material in the grinding area, thereby increasing the grinding capture frequency of materials of different particle sizes. Simultaneously, the disturbed material and grinding media are aligned with the slope 34 of the grinding block 3 in the direction of motion. The slope 34 can push the material and grinding media to a larger surrounding area, further increasing the collision frequency. By providing elongated protrusions 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, improving the mixing uniformity of the material in the grinding chamber 2, reducing the particle size distribution range of the material after grinding, and improving the grinding effect.
[0042] Optionally, the grinding block 3 has four sides and a top surface. The sides with the first protrusion 31 are the first side 32 and the second side 33, and the sides facing the circumferentially adjacent third protrusion 11 are the third side and the fourth side. At least one of the third side and the fourth side of the grinding block 3 is a slope 34.
[0043] Optionally, the slope of the slope 34 is 20 to 70 degrees, and the slope is based on the tangential direction at the junction of the outer wall of the rotor 1 and the slope 34.
[0044] Optionally, the rotor 1 has a plurality of through holes 12 on its surface, and the through holes 12 are far from the first end of the inner cavity. The through holes 12 are configured to discharge material and allow local circulation of the grinding media in the area near the second end of the grinding chamber 2.
[0045] Referring to Figure 8, optionally, the projections of the through hole 12 on the inner wall surfaces on both sides of the rotor 1 in the axial direction and 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 0 to 45 degrees, respectively.
[0046] Optionally, the first included angle is 45 degrees.
[0047] Optionally, the projection of the first protrusions 31 arranged in the same circumference onto the radial section of the rotor 1 is a ring array, and the angle between the orientation of each first protrusion 31 and the rotational circumference of the rotor 1 is an acute angle.
[0048] Referring to Figures 2 and 3, the rotor 1 rotates counterclockwise. The projection of each first protrusion 31 along the annular array gradually changes its orientation clockwise or counterclockwise based on the center point of the projection of the first protrusion 31. This allows the side of each first protrusion 31 facing the inner wall of the grinding cylinder 2 to have an outward centrifugal force, which can impart a radial outward force to the grinding media and materials.
[0049] Optionally, the rotation direction of the rotor 1 is matched with the orientation of the first protrusion 31 so that the grinding medium has an outward centrifugal motion tendency after being energized by the first protrusion 31.
[0050] Optionally, the central angle between each of the grinding blocks and the axially adjacent grinding block is 22.5 to 60 degrees; wherein, the central angle is centered on the projection of the central axis of the rotor onto the radial section of the rotor, and connects the projection points of the centroids of the two grinding blocks onto the radial section of the rotor.
[0051] Optionally, the second protrusion 23 forms a plurality of circumferences on the inner wall of the grinding cylinder 2 that are perpendicular to the axial direction of the grinding cylinder 2.
[0052] Optionally, the second protrusion 23 corresponds to the grinding block 3, wherein the projection of each grinding block 3 onto the inner wall of the grinding cylinder 2 at a certain moment coincides with the installation position of the second protrusion corresponding to that grinding block. Ideally, the protrusion 23 should be located directly above the grinding block, because the acceleration effect is better at the top than in the intervening area, and the protrusion dispersion effect is better.
[0053] The content disclosed in this disclosure is only a preferred embodiment of this disclosure and is used only to illustrate the technical solutions of this disclosure, not to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure. Industrial applicability
[0054] In summary, the present invention provides a grinding structure for a horizontal sand mill, which can increase the effective area of the friction shearing and extrusion collision energizing surfaces, improve the mixing uniformity of the grinding material in the grinding chamber, increase the collision frequency of the grinding media in the grinding area between the outer side of the grinding block and the inner wall of the grinding cylinder, and achieve a better grinding effect.
Claims
1. A grinding structure for a horizontal sand mill, comprising a grinding cylinder and a rotatable rotor; the rotor's main body is a cylinder with multiple grinding blocks disposed on its outer wall surface; the inner cavity of the grinding cylinder is a cylindrical structure with two ends, and the rotor is disposed within the inner cavity; the feed inlet of the horizontal sand mill communicates with the inner cavity through a first end, and the discharge outlet of the horizontal sand mill communicates with the inner cavity through a second end; characterized in that, The grinding block has an elliptical first protrusion on both the side facing the first end of the inner cavity and the side facing the second end of the inner cavity; the orientation of the first protrusion has a first angle with the radial direction of the rotor's circumference, and the first angle is 15 to 75 degrees. The inner wall of the grinding cylinder is provided with a plurality of elliptical second protrusions; the orientation of each second protrusion on the inner wall of the grinding cylinder has a second included angle with the axial direction of the grinding cylinder, and the second included angle is 20 to 70 degrees; the orientation of each pair of axially adjacent second protrusions on the inner wall of the grinding cylinder has a third included angle, and the angle bisector of the third included angle corresponding to at least one pair of adjacent second protrusions has an angle of less than 10 degrees with the circumferential plane of the grinding cylinder.
2. The grinding structure according to claim 1, characterized in that, The orientation of the second protrusion near the feed inlet and the orientation of the second protrusion near the discharge outlet form a fourth angle, 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 or 2, characterized in that, The outer wall of the rotor is also provided with a long strip-shaped third protrusion; the orientation of the third protrusion is the same as that of the rotor axis.
4. The grinding structure according to claim 3, characterized in that, The grinding block and the third protrusion are arranged crosswise on the outer wall surface of the rotor along the circumferential and axial directions of the rotor, such 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 sides and a top surface. The sides with the first protrusion are the first side and the second side, and the sides facing the circumferentially adjacent third protrusion are the third side and the fourth side. At least one of the third side and the fourth side of the grinding block is a slope.
6. The grinding structure according to claim 5, characterized in that, The slope of the slope is 20 to 70 degrees, and the slope is based on the tangential direction at the junction of the outer wall of the rotor and the slope.
7. The grinding structure according to any one of claims 1-6, characterized in that, The rotor has multiple through holes on its surface, and the through holes are far from the first end of the inner cavity. The through holes are configured to discharge material and allow local circulation of the grinding media in the area near the second end of the grinding cavity.
8. The grinding structure according to claim 7, characterized in that, The projections of the through hole onto the inner wall surfaces on both sides of the rotor in the axial direction and onto the radial section of the rotor are two straight lines, and the angles between these two straight lines and the radial direction on the radial section of the rotor are 0 to 45 degrees.
9. The grinding structure according to any one of claims 1-8, characterized in that, The projection of the first protrusions arranged in the same circumference onto the radial section of the rotor is a ring array, and the angle between the orientation of each first protrusion and the rotational circumference of the rotor is an acute angle.
10. The grinding structure according to any one of claims 1-9, characterized in that, The central angle between each grinding block and its axially adjacent grinding block is 22.5 to 60 degrees; wherein, the central angle is centered on the projection of the central axis of the rotor onto the radial section of the rotor, and connects the projection points of the centroids of the two grinding blocks onto the radial section of the rotor.