Horizontal sand mill with vertical centrifugal discharge
By introducing separation pipes, separation paddles, and self-suction cups into the horizontal sand mill, the movement trajectory and speed of materials and grinding media are controlled, solving the problems of grinding media accumulation and inconvenient material discharge in the vertical output horizontal sand mill. This achieves efficient grinding media circulation and material separation, thereby improving grinding efficiency.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- DONGGUAN LONGLY MASCH CO LTD
- Filing Date
- 2025-08-27
- Publication Date
- 2026-05-15
AI Technical Summary
In horizontal sand mills with vertical output, grinding media tend to accumulate at the discharge port, resulting in poor grinding effect and difficulty in discharging the material due to mixing of the grinding media and the material. Existing technologies make it difficult to effectively control the movement trajectory and speed of the material and grinding media.
The horizontal sand mill with vertical centrifugal discharge uses a structural design including separation pipes, separation paddles, and self-suction cups to control the movement trajectory and speed of materials and grinding media, thereby achieving separation of materials and grinding media, preventing grinding media from entering the discharge channel, and promoting the circulation of grinding media within the grinding cylinder.
It effectively avoids the grinding media clogging the discharge channel, facilitates material discharge, improves grinding efficiency, enhances the circulation of grinding media in the grinding cylinder, and improves the overall grinding effect.
Smart Images
Figure CN2025117230_15052026_PF_FP_ABST
Abstract
Description
A horizontal sand mill with vertical centrifugal discharge.
[0001] Cross-reference to related applications
[0002] This application claims priority to Chinese Patent Application No. 2024116024194, filed on November 11, 2024, entitled "A Horizontal Sand Mill with Vertical Centrifugal Discharge," the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of horizontal sand mill technology, and more particularly to a horizontal sand mill with vertical centrifugal discharge. Background Technology
[0004] A sand mill is a machine that uses a rotor to drive the material and grinding media (such as grinding balls) in the grinding chamber to collide and compress, thus achieving grinding. Due to the difference in specific gravity and hardness between the material and the grinding media, the material is ground and broken down into tiny particles during the collision process. Current sand mills include horizontal sand mills, vertical sand mills, and basket mills.
[0005] Horizontal sand mills typically have horizontal input and output. However, existing technologies are beginning to see horizontal sand mills with vertical output. For example, patent 202320967243.7 uses a vertical grinding cylinder, moving the grinding area from the original horizontal direction to the vertical direction, thus occupying less space compared to horizontal output. However, in horizontal sand mills with vertical output, the grinding media tends to accumulate at the outlet of the horizontal grinding cylinder, resulting in poor grinding effect. Furthermore, the grinding media mixes with the material, making discharge inconvenient. The grinding media that should be in the grinding area can also easily enter the discharge channel with the material, leading to ball leakage. Summary of the Invention
[0006] The technical problem to be solved by this application is to provide a horizontal sand mill with vertical centrifugal discharge, which can control the movement trajectory and speed of materials and grinding media to avoid ball leakage at the discharge port, accelerate the circulation of grinding media in the grinding cylinder, and improve grinding efficiency.
[0007] To address the aforementioned technical problems, this application discloses a vertical centrifugal discharge horizontal sand mill, comprising a grinding cylinder and a rotatable grinding rotor. The main body of the grinding rotor is a cylindrical structure, with multiple grinding blocks configured for grinding on its outer wall surface. The grinding rotor is disposed within the inner cavity of the grinding cylinder. An outlet for the grinding cylinder is provided on the cylindrical outer wall of one side of the grinding cylinder, which connects to the discharge port of the horizontal sand mill. The feed port of the horizontal sand mill is located on the other side of the grinding cylinder.
[0008] A separation pipe is provided between the outlet of the grinding cylinder and the discharge port of the horizontal sand mill. A first protrusion is provided on the inner wall of the separation pipe. The first protrusion is wavy with multiple continuous protrusions, and the protrusions closer to the discharge port of the horizontal sand mill are higher on the inner wall of the separation pipe.
[0009] A separating paddle is provided between the outlet of the separating pipe and the discharge port of the horizontal sand mill. The separating paddle includes blades and a hub configured to mount the blades and drive them to rotate. The separating paddle imparts a vertically downward velocity component to the material through the blades.
[0010] As an optional implementation, a self-suction cup is also included; the self-suction cup is located above the separating paddle and below the discharge port of the horizontal sand mill;
[0011] The self-suction cup is provided with multiple self-suction holes, which are through holes and the diameter gradually decreases from the upper surface to the lower surface of the self-suction cup.
[0012] As another optional implementation, the surface of the protruding portion of the first protrusion is a wavy curve in the axial section of the separation pipe, and the radius of curvature of the wavy curve corresponding to the protruding portion closer to the discharge port is larger.
[0013] As another optional implementation, the hub is a cylinder, and the blades are mounted on the cylindrical surface of the hub.
[0014] The blade is an arc plate formed by bending a circular arc. The angle between the tangent direction of the upper part of the blade and the axial direction of the hub is 0 to 75 degrees. The tangent direction of the lower part of the blade is parallel to the axial direction of the hub.
[0015] As another optional implementation, the blades are multiple and evenly distributed on the cylindrical surface of the hub, and the distance between the upper end of each blade and the cylindrical surface of the hub is less than the distance between the lower end of the blade and the cylindrical surface of the hub.
[0016] As another optional implementation, the self-priming holes are evenly distributed in the circumferential direction of the self-priming cup.
[0017] As another optional implementation, the distance between the inlet of each self-suction hole on the upper surface of the self-suction cup and the edge of the self-suction cup is less than the distance between the outlet of the self-suction hole on the lower surface of the self-suction cup and the edge of the self-suction cup.
[0018] As another optional implementation, a connecting pipe is provided between the outlet of the separation pipe and the discharge port of the horizontal sand mill; the diameter of the connecting pipe is larger the closer it is to the discharge port of the horizontal sand mill; the separation paddle is disposed in the connecting pipe.
[0019] As another optional implementation, the grinding block includes a plurality of first grinding blocks and a plurality of second grinding blocks; the second grinding blocks are all disposed on the outer wall surface of the rotor near the grinding outlet, and the first grinding blocks are all disposed on the other side of the outer wall surface of the rotor; all the first grinding blocks are evenly distributed along the axial and circumferential directions of the rotor on the outer wall surface of the rotor; the second grinding blocks are evenly distributed circumferentially and spirally wrapped around the outer wall surface of the rotor.
[0020] As another optional implementation, the inner wall surface of the grinding cylinder is provided with a plurality of third protrusions near the grinding outlet.
[0021] Compared with the prior art, the embodiments of this application have the following beneficial effects:
[0022] The horizontal sand mill of this application adopts vertical discharge. The movement trajectory and speed of the material and grinding media are controlled by the separation pipe, separation paddle and self-suction cup in the discharge channel, so as to separate the material and grinding media, restrict the grinding media from entering the discharge channel, avoid the grinding media from blocking the discharge channel, and facilitate the discharge of material. The grinding rotor and grinding cylinder realize the intracavitary circulation of grinding media in the grinding chamber through grinding blocks and protrusions. This not only avoids the grinding media from accumulating at the outlet of the grinding cylinder, but also increases the volume fraction of grinding media on the material inlet side of the grinding cylinder, thereby improving the grinding efficiency. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 is a structural schematic diagram of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of this application;
[0025] Figure 2 is another structural schematic diagram of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of this application;
[0026] Figure 3 is a partial structural schematic diagram of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of this application;
[0027] Figure 4 is a schematic diagram of another part of the structure of a vertical centrifugal discharge horizontal sand mill disclosed in an embodiment of this application;
[0028] Figure 5 is a schematic diagram of the separation paddle of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of this application;
[0029] Figure 6 is a schematic diagram of the structure of the self-suction disc of a vertical centrifugal discharge horizontal sand mill disclosed in an embodiment of this application;
[0030] Figure 7 is another structural schematic diagram of the self-suction disc of a vertical centrifugal discharge horizontal sand mill disclosed in an embodiment of this application;
[0031] Figure 8 is a schematic diagram of the centrifugal separation device of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of this application;
[0032] Figure 9 is a cross-sectional structural schematic diagram of the centrifugal separation device of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of this application;
[0033] Figure 10 is a schematic diagram of the grinding rotor of a vertical centrifugal discharge horizontal sand mill disclosed in an embodiment of this application;
[0034] Figure 11 is another structural schematic diagram of the grinding rotor of a vertical centrifugal discharge horizontal sand mill disclosed in an embodiment of this application;
[0035] Figure 12 is a schematic diagram of the grinding cylinder of a vertical centrifugal discharge horizontal sand mill disclosed in an embodiment of this application;
[0036] Figure 13 is a schematic diagram of the structure of the protrusion of a vertical centrifugal discharge horizontal sand mill disclosed in an embodiment of this application;
[0037] Figure 14 is another structural schematic diagram of the grinding cylinder of a vertical centrifugal discharge horizontal sand mill disclosed in an embodiment of this application;
[0038] Figure 15 is a fluid simulation result diagram of a vertical centrifugal discharge horizontal sand mill disclosed in an embodiment of this application;
[0039] Figure 16 is a partially enlarged schematic diagram of the fluid simulation results of a vertical centrifugal discharge horizontal sand mill disclosed in an embodiment of this application. Detailed Implementation
[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0041] Referring to Figures 1-16, this application discloses a vertical centrifugal discharge horizontal sand mill, including a rotatable grinding rotor 1 and a grinding cylinder 2. The main body of the grinding rotor 1 is a cylindrical structure, and a plurality of grinding blocks 3 configured for grinding are provided on its outer wall surface. The grinding rotor 1 is disposed in the inner cavity of the grinding cylinder 2. An outlet 21 of the grinding cylinder 2 is provided on the cylindrical outer wall of one side of the grinding cylinder 2, and the outlet is connected to the discharge port 4 of the horizontal sand mill. The feed port 5 of the horizontal sand mill is provided on the other side of the grinding cylinder 2. A separation pipe 6 is provided between the outlet of the grinding cylinder 2 and the discharge port 4 of the horizontal sand mill. A first protrusion 61 is provided on the inner wall of the separation pipe 6. The first protrusion 61 is a wavy structure with a plurality of continuous protrusions, and the protrusions closer to the discharge port 4 of the horizontal sand mill are higher on the inner wall of the separation pipe 6.
[0042] A separating paddle 7 is also provided between the outlet of the separating pipe 6 and the discharge port 4 of the horizontal sand mill. The separating paddle 7 includes a blade 71 and a hub 72 configured to mount the blade 71 and drive the blade 71 to rotate. The separating paddle 7 imparts a vertically downward velocity component to the material through the blade 71.
[0043] In this embodiment, the inner cavity of the grinding cylinder 2 is a cylindrical structure with two ends, and the feed inlet of the horizontal sand mill is located on the cylindrical outer wall on the other side of the grinding cylinder 2 or on the end face of the inner cavity.
[0044] In this embodiment, referring to the fluid simulation diagrams in Figures 15 and 16, when the grinding ball (grinding medium) collides with the protrusion 61, it obtains an inwardly oblique velocity component. Under the drag force of the downward-moving material, it returns to the grinding area of the grinding cylinder 2. This results in the position of the material's vertical velocity component being higher below the separating paddle 7 and in the middle region of the separating pipe 6 in Figures 15 and 16, with the velocity direction pointing downwards. However, due to the Coanda effect, the material flow velocity is lower at the wall position of the separating pipe 6, and its vertical velocity component is pointing upwards. Due to the pressure difference between the grinding chamber and the discharge port... Due to the presence of the material difference, the material on the wall of pipe 6 will flow upward along the wall, while the material in the middle area of the separation pipe 6 will flow downward due to the energy provided by the separation paddle 7 and its own gravity. This achieves the separation of material from grinding balls, restricts grinding balls from entering the non-grinding area above, and prevents balls from leaking out of the outlet 4. Since the material in the middle area of the separation pipe 6 moves downward, the grinding balls can quickly enter the cavity of the grinding cylinder 2 downward and circulate, preventing blockage at the outlet of the grinding cylinder 2, increasing the volume fraction of grinding media on the material inlet side of the grinding cylinder 2, and improving grinding efficiency.
[0045] In an optional embodiment, the surface of the protruding portion of the first protrusion 61 is a wavy curve in the axial section of the separation pipe 6, and the radius of curvature of the wavy curve corresponding to the protruding portion closer to the discharge port 4 is larger.
[0046] Taking Figures 2 and 4 as examples, the separation pipe 6 is installed in the area where the vertical discharge and grinding cylinder are connected. The separation pipe 6 is provided with progressive wave-shaped curve separation and peeling protrusions 61, and the radius of curvature of the protrusions decreases from top to bottom. When the sand mill is working, due to the energizing effect of the grinding rotor 1 and the separating paddle 7, and the difference in the ratio between the diameter of the grinding cylinder 2 and the diameter of the intersecting pipe 6, when the material flows through the separating pipe 6, the material near the pipe wall flows upward, while the material in the middle area of the separating pipe 6 flows downward. When the material and zircon balls flow through the progressive wave-shaped curve separation and peeling protrusion 61, due to the Coanda effect, the material can flow along the wall. The wave-shaped protrusion structure can block some of the zircon balls moving upward along the wall. In addition, when the grinding balls collide with the protrusion 61, they gain an inward velocity component and lose some kinetic energy. Under the drag force of the downward moving material, they return to the grinding area of the grinding cylinder 2. The progressive wave-shaped curve separation and peeling protrusion 61 can reduce the vertical upward velocity component and kinetic energy of the zircon balls. The design of the protrusion with a gradually decreasing radius of curvature from top to bottom can play a role in the graded peeling and separation of the material and grinding media. In addition, it can also reduce the frictional resistance of the material flowing along the wall.
[0047] In another optional embodiment, the hub 72 is a cylinder, and the blades 71 are mounted on the cylindrical surface of the hub 72.
[0048] The blade 71 is an arc plate formed by bending a circular arc. The angle between the tangent direction of the upper part of the blade 71 and the axial direction of the hub 72 is 0 to 75 degrees. The tangent direction of the lower part of the blade 71 is parallel to the axial direction of the hub 72.
[0049] In another optional embodiment, the blades 71 are multiple and evenly distributed on the cylindrical surface of the hub 72, and the distance between the upper end of each blade 71 and the cylindrical surface of the hub 72 is less than the distance between the lower end of the blade 71 and the cylindrical surface of the hub 72.
[0050] Taking Figures 3 and 4 as examples, the separator 7 has three blades 71 on its outer side. The blades 71 are evenly distributed around the circumference and rotate clockwise when viewed from top to bottom. The cross-section of the blades 71 is designed with arcs. The tangent of the uppermost arc forms a 30° angle with the vertical direction, and the tangent of the lowermost arc is parallel to the vertical direction. The outer diameter of the lower end of the blade 71 is larger than that of the upper end. When the separator 7 is working, the material moves diagonally downward under the drive of the blades. The arc design of the blades works in conjunction with the opening angle of the self-suction cup 8 to give the material a vertical downward velocity component and reduce running resistance. The outer diameter of the lower end of the blade 71 is larger than that of the upper end, which increases the energy of the material at the bottom end. It works in conjunction with the tapered connecting pipe 9 and the separation pipe 6 to increase the turbulent kinetic energy of the material in this area and improve the separation probability of the zirconium balls.
[0051] In another optional embodiment, a self-suction cup 8 is also included; the self-suction cup 8 is disposed above the separating paddle 7 and below the discharge port 4 of the horizontal sand mill;
[0052] The self-suction cup 8 is provided with a plurality of self-suction holes 81, which are through holes and the diameter of the holes gradually decreases from the upper surface to the lower surface of the self-suction cup 8.
[0053] In yet another alternative embodiment, the self-suction holes 81 are evenly distributed in the circumferential direction of the self-suction cup 8.
[0054] In another alternative embodiment, the distance between the inlet of each self-suction hole 81 on the upper surface of the self-suction cup 8 and the edge of the self-suction cup 8 is less than the distance between the outlet of the self-suction hole 81 on the lower surface of the self-suction cup 8 and the edge of the self-suction cup 8.
[0055] Taking Figures 3, 6, and 7 as examples, the self-suction cup 8 is installed above the separating paddle 7, with five self-suction holes 81 in the middle. The self-suction holes 81 are evenly distributed in the circumferential direction, and the diameter of the self-suction holes 81 gradually decreases from top to bottom. The positioning radius of the upper opening is larger than that of the lower opening, that is, the opening is obliquely downward from the outside to the inside. When the self-suction cup 8 is working, the material moves from top to bottom through the self-suction holes, and is given a centripetal velocity component. In coordination with the separating paddle 7, it transports the slurry with a high zirconium ball content into the grinding chamber. In addition, the presence of the self-suction holes 81 can reduce the pressure difference in the upper region of the separating paddle 7, thereby alleviating the discharge pressure of the vertical discharge chamber.
[0056] In another optional embodiment, a connecting pipe 9 is provided between the outlet of the separating pipe 6 and the discharge port 4 of the horizontal sand mill; the diameter of the connecting pipe 9 is larger the closer it is to the discharge port 4 of the horizontal sand mill; the separating paddle 7 is disposed in the connecting pipe 9.
[0057] In this embodiment, optionally, the wall of the connecting pipe 9 can be a truncated conical surface with a vertex, the vertex of which is located below the connecting pipe 9; through the truncated conical surface design, when the material moves from top to bottom, the flow rate will increase due to the gradual reduction of the cross-sectional area, i.e., the flow channel narrows; while when it moves from bottom to top, the material flow rate will decrease due to the gradual expansion of the cross-sectional area, i.e., the flow channel widens, and gravity acts simultaneously.
[0058] Referring to Figures 8 and 9, in another optional embodiment, a centrifugal separator 10 is further included. The inlet 101 of the centrifugal separator 10 is located on its outer surface, and the outlet 102 of the centrifugal separator 10 is located inside it. The outlet of the centrifugal separator 10 is connected to the discharge port 4 of the horizontal sand mill. The centrifugal separator 10 rotates during operation. Due to the incompressibility of the material, the material outside the centrifugal separator 10 can overcome the dynamic pressure imparted by the rotation of the separator 10 and the local resistance of the channel to flow into the separator 10. Then, it enters the discharge port 4 of the horizontal sand mill through the outlet of the centrifugal separator 10. Since the grinding media has a larger volume and density than the material, it needs to overcome greater resistance to escape. Therefore, the centrifugal separator 10 can effectively separate the grinding media inside the material.
[0059] Referring to Figures 2 and 4, in another optional embodiment, a discharge channel 11 is also included; the bottom of the discharge channel 11 is connected to the connecting pipe 9, and the centrifugal separation device 10 is disposed in the discharge channel 11.
[0060] In another optional embodiment, the grinding block 3 includes a plurality of first grinding blocks 31 and a plurality of second grinding blocks 32; the second grinding blocks 32 are all disposed on the outer wall surface of the grinding rotor 1 on the side near the grinding outlet, and the first grinding blocks 31 are all disposed on the other side of the outer wall surface of the grinding rotor 1; all the first grinding blocks 31 are evenly distributed along the axial and circumferential directions of the grinding rotor 1 on the outer wall surface of the rotor; the second grinding blocks 32 are evenly distributed circumferentially and spirally wrapped around the outer wall surface of the grinding rotor 1.
[0061] Taking Figure 11 as an example, the grinding rotor 1 rotates inward under the drive of the motor (counterclockwise when viewed from the left), causing the zirconium balls (a type of grinding media ball) to collide and squeeze each other, crushing and grinding the material. The adjacent grinding blocks 3 at the outlet end are installed obliquely, which imparts an axial velocity component to the zirconium balls in the direction of the feed inlet when rotating, effectively preventing the zirconium balls from accumulating at the outlet side of the grinding cylinder 2. In this embodiment, the grinding blocks 3 on the grinding rotor 1 are divided into two types of protrusions according to their distance from the grinding outlet. The first grinding block 31, which is far from the grinding outlet, is a common uniformly distributed block. After the material enters the inner cavity of the grinding cylinder 2 from the feed inlet, it can flow to the grinding outlet through the gap. The second grinding block 32, which is close to the grinding outlet, is a spirally wound design. With the rotation of the grinding rotor 1, it can apply a force to the grinding medium in the direction of the feed inlet, so that the grinding medium can circulate within the grinding cavity, thereby preventing the grinding medium from accumulating at the outlet of the grinding cylinder 2.
[0062] In an optional embodiment, the normal direction of the side of the second grinding block 32 facing the feed inlet of the horizontal sand mill forms an angle with the circumferential direction of the grinding rotor 1, the angle being 15 to 75 degrees.
[0063] In yet another alternative embodiment, the second grinding block 32 is a cylindrical column with a circular key cross-section.
[0064] In yet another alternative embodiment, the height of the second grinding block 32 is lower than that of the first grinding block 31.
[0065] In another optional embodiment, the grinding block 3 is made of zirconium oxide and is fixed to the grinding rotor 1 by bolts.
[0066] Taking Figures 10-11 as an example, the grinding blocks 31 at the inlet end of the grinding rotor 1 are divided into four equal parts circumferentially, with adjacent grinding blocks 31 not misaligned axially; the grinding blocks 32 at the outlet end are divided into four equal parts circumferentially, with adjacent grinding blocks 32 staggered by 22.5° axially. The parallel symmetrical planes on both sides of the grinding blocks 32 form a 30° angle with the vertical direction, and the height of the grinding blocks 32 is 2mm lower than that of the grinding blocks 31 at the inlet end. The grinding blocks 3 can be made of zirconium oxide or PU coated material. When made of zirconium oxide, the grinding blocks 3 can be fixed to the grinding rotor 1 with bolts for easy replacement after wear. In addition, the arrangement of the grinding blocks 3 on the grinding rotor 1 is not limited to the above method. The overall arrangement of the grinding blocks 3 can be installed with reference to the form at the outlet end. By staggering the axially adjacent grinding blocks 3, the continuity of the axial velocity component of the zirconium balls towards the material inlet can be improved, thus increasing the circulation efficiency. In addition, the volume fraction of the grinding media on the material inlet side of the grinding cylinder 2 can be increased, thereby improving the grinding efficiency. Finally, the height of the grinding block 32 at the outlet end is lower than that of the grinding block 31 at the inlet end, which can reduce the initial velocity of the zirconium balls after being energized at the outlet end of the grinding cylinder 2, thereby reducing the probability of the zirconium balls entering the vertical separation outlet area.
[0067] In another optional embodiment, the inner wall surface of the grinding cylinder 2 is provided with a plurality of third protrusions 22 near the grinding outlet.
[0068] In yet another alternative embodiment, the third protrusion 22 is spirally distributed around the inner wall surface of the grinding cylinder 2.
[0069] In another optional embodiment, the normal direction of the side of the third protrusion 22 facing the feed inlet of the horizontal sand mill forms an angle with the circumferential direction of the grinding cylinder 2, the angle being 0 to 60 degrees.
[0070] In yet another alternative embodiment, the edges of the third protrusion 22 are rounded.
[0071] Taking Figures 12-14 as examples, the outlet end of the grinding cylinder 2 is provided with a vertical discharge opening. Near the opening, the wall surface is provided with four equally spaced, axially adjacent, staggered protrusions 22 in the circumferential direction. The length direction of the protrusions 22 forms a 30° angle with the central axis of the grinding cylinder 2. In terms of shape, the front face 221 of the protrusion 22 is perpendicular to the grinding cylinder 2 at the connection point, and the outer end is chamfered and rounded. The back face 222 of the protrusion 22 is parallel to the tangent normal of the grinding cylinder 2, and the outermost end is rounded with a smaller radius than the front face. When the zirconium balls (grinding balls) move to the protrusion area of the grinding cylinder 2, they acquire a velocity component along the axial direction of the grinding cylinder 2. This causes the zirconium balls near the inner wall of the outlet end of the grinding cylinder 2 to circulate towards the inlet side, reducing the probability of zirconium ball accumulation at the outlet end of the grinding cylinder 2 and increasing the collision frequency of zirconium balls in the grinding area, thereby improving grinding efficiency. The chamfered angle of the protrusion 22 and the tilt angle of the grinding block 32 at the outlet end of the grinding rotor 1 work together in spatial geometry during rotation. Under the combined effect of the two, the probability of zirconium ball accumulation at the outlet end of the grinding cylinder 2 is further reduced. The rounded outer end of the protrusion 22 can reduce the contact resistance and local stress between the protrusion 22 and the grinding medium and material, thereby reducing the wear degree of the outer end of the protrusion 22.
[0072] The content disclosed in the embodiments of this application is only a preferred embodiment of this application and is only used to illustrate the technical solution of this application, and is not intended to limit it. Although this application 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 application. Industrial applicability
[0073] The horizontal sand mill with vertical centrifugal discharge of this application avoids ball leakage at the discharge port and accelerates the circulation of grinding media in the grinding cylinder by controlling the movement trajectory and speed of the material and grinding media. This improves grinding efficiency.
Claims
1. A vertical centrifugal discharge horizontal sand mill, comprising a rotatable grinding rotor and a grinding cylinder, wherein the main body of the grinding rotor is a cylindrical structure, and a plurality of grinding blocks configured for grinding are provided on its outer wall surface; the grinding rotor is disposed in the inner cavity of the grinding cylinder; an outlet of the grinding cylinder is provided on the cylindrical outer wall on one side of the grinding cylinder, the outlet being connected to the discharge port of the horizontal sand mill, and the feed port of the horizontal sand mill is located on the other side of the grinding cylinder; characterized in that, A separation pipe is provided between the outlet of the grinding cylinder and the discharge port of the horizontal sand mill. A first protrusion is provided on the inner wall of the separation pipe. The first protrusion is a wave-shaped structure with multiple continuous protrusions. The protrusions closer to the discharge port of the horizontal sand mill are higher on the inner wall of the separation pipe. A separation paddle is provided between the outlet of the separation pipe and the discharge port of the horizontal sand mill. The separation paddle includes blades and a hub configured to mount the blades and drive them to rotate. The separation paddle imparts a vertically downward velocity component to the slurry through the blades.
2. The horizontal sand mill according to claim 1, characterized in that, It also includes a self-suction cup; the self-suction cup is located above the separating paddle and below the discharge port of the horizontal sand mill; The self-suction cup is provided with multiple self-suction holes, which are through holes and the diameter gradually decreases from the upper surface to the lower surface of the self-suction cup.
3. The horizontal sand mill according to claim 1, characterized in that, The surface of the protruding portion of the first protrusion is a wavy curve on the axial section of the separation pipe, and the radius of curvature of the wavy curve corresponding to the protruding portion closer to the discharge port is larger.
4. The horizontal sand mill according to claim 1, characterized in that, The hub is a cylinder, and the blades are mounted on the cylindrical surface of the hub. The blade is an arc plate formed by bending a circular arc. The angle between the tangent direction of the upper part of the blade and the axial direction of the hub is 0 to 75 degrees. The tangent direction of the lower part of the blade is parallel to the axial direction of the hub.
5. The horizontal sand mill according to claim 1 or 4, characterized in that, The blades are multiple and evenly distributed on the cylindrical surface of the hub. The distance between the upper end of each blade and the cylindrical surface of the hub is less than the distance between the lower end of the blade and the cylindrical surface of the hub.
6. The horizontal sand mill according to claim 2, characterized in that, The self-priming holes are evenly distributed along the circumference of the self-priming cup.
7. The horizontal sand mill according to claim 2 or 6, characterized in that, The distance between the inlet of each self-priming hole on the upper surface of the self-priming cup and the edge of the self-priming cup is less than the distance between the outlet of the self-priming hole on the lower surface of the self-priming cup and the edge of the self-priming cup.
8. The horizontal sand mill according to claim 1, characterized in that, A connecting pipe is provided between the outlet of the separation pipe and the discharge port of the horizontal sand mill; the diameter of the connecting pipe is larger the closer it is to the discharge port of the horizontal sand mill; the separation paddle is located in the connecting pipe.
9. The horizontal sand mill according to claim 1, characterized in that, The grinding block includes a plurality of first grinding blocks and a plurality of second grinding blocks; the second grinding blocks are all disposed on the outer wall surface of the rotor on the side near the outlet of the grinding cylinder, and the first grinding blocks are all disposed on the other side of the outer wall surface of the rotor; all the first grinding blocks are evenly distributed on the outer wall surface of the rotor along the axial and circumferential directions of the rotor; the second grinding blocks are evenly distributed circumferentially and spirally wrapped around the outer wall surface of the rotor.
10. The horizontal sand mill according to claim 9, characterized in that, The inner wall of the grinding cylinder is provided with a plurality of third protrusions near the grinding outlet.