Horizontal sand mill capable of vertically and centrifugally discharging

Abstract

The vertical centrifugal discharging horizontal sand mill comprises a grinding rotor and a grinding cylinder, and a grinding block is arranged on the grinding rotor; an outlet of the grinding cylinder is formed in one side of the grinding cylinder and is communicated with a discharge hole of the horizontal sand mill; a separation pipeline is arranged between the outlet of the grinding cylinder and the discharge port of the horizontal sand mill, a first bulge is arranged on the inner wall of the separation pipeline, the first bulge is of a wavy structure with a plurality of continuous bulge parts, and the bulge parts closer to the discharge port of the horizontal sand mill are higher on the inner wall of the separation pipeline; a separation paddle is further arranged between the outlet of the separation pipeline and the discharge hole of the horizontal sand mill, the separation paddle comprises a paddle blade and a paddle hub used for mounting the paddle blade and driving the paddle blade to rotate, and the separation paddle endows the slurry with a vertically downward speed component through the paddle blade. According to the invention, ball leakage at the discharge port can be avoided by controlling the motion trail and speed of the material and the grinding medium, circulation of the grinding medium in the grinding cylinder is accelerated, and the grinding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of horizontal sand mills, in particular to a horizontal sand mill with vertical centrifugal discharging. Background Art

[0002] A sand mill is a machine that grinds materials in a grinding chamber by driving a rotor to collide and squeeze the materials and grinding media (such as grinding balls). Due to the different specific gravities and hardnesses of the materials and grinding media, the materials will be ground and decomposed into tiny particles during the collision between the materials and grinding media. The current sand mills include horizontal sand mills, vertical sand mills, basket sand mills, etc.

[0003] Generally, horizontal sand mills have horizontal input and horizontal output, but in the prior art, horizontal sand mills with vertical output have begun to appear. For example, Patent 202320967243.7 uses a vertical grinding cylinder to move the original horizontal grinding area to the vertical direction, which can take up less space than horizontal output. However, in horizontal sand mills with vertical output, the grinding media is easily accumulated at the outlet of the horizontal grinding cylinder, resulting in poor grinding effect, and the grinding media is mixed with the material, which is not convenient for discharging. The grinding media that should be in the grinding area is also easy to enter the discharge channel with the material, resulting in ball leakage. Summary of the invention

[0004] The technical problem to be solved by the present invention 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.

[0005] In order to solve the above technical problems, the present invention discloses a horizontal sand mill with vertical centrifugal discharge, comprising a grinding drum and a rotatable grinding rotor, wherein the main body of the grinding rotor is a cylindrical structure, and a plurality of grinding blocks for grinding are arranged on the outer wall surface thereof; the grinding rotor is arranged in the inner cavity of the grinding drum; an outlet of the grinding drum is arranged on the cylindrical outer wall on one side of the grinding drum, and the outlet is connected to the discharge port of the horizontal sand mill, and the feed port of the horizontal sand mill is arranged on the other side of the grinding drum;

[0006] A separation pipe is provided between the outlet of the grinding cylinder and the discharge port of the horizontal sand mill, and a first protrusion is provided on the inner wall of the separation pipe. The first protrusion is in a wave shape with a plurality of continuous protrusions, and the closer the protrusion is to the discharge port of the horizontal sand mill, the higher the height on the inner wall of the separation pipe;

[0007] 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 a blade and a hub for mounting the blade and driving the blade to rotate. The separation paddle imparts a vertical downward velocity component to the material through the blade.

[0008] As an optional embodiment, it further includes a self-suction disc; the self-suction disc is arranged above the separation paddle and below the discharge port of the horizontal sand mill;

[0009] The self-suction cup is provided with a plurality of self-suction holes, which are through holes and whose apertures gradually decrease from the upper surface to the lower surface of the self-suction cup.

[0010] As another optional embodiment, the surface of the raised portion of the first protrusion is a wave curve in the axial section of the separation pipe, and the radius of curvature of the wave curve corresponding to the raised portion closer to the discharge port is larger.

[0011] As another optional embodiment, the hub is a cylinder, and the blades are mounted on the cylindrical surface of the hub;

[0012] The blade is an arc plate bent based on an arc line, the angle between the tangent direction of the arc line corresponding to the upper end of the blade and the axial direction of the hub is 0 to 75 degrees, and the tangent direction of the arc line corresponding to the lower end of the blade is parallel to the axial direction of the hub.

[0013] As another optional embodiment, 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 smaller than the distance between the lower end of the blade and the cylindrical surface of the hub.

[0014] As another optional implementation, the self-priming holes are evenly distributed in the circumferential direction of the self-priming cup.

[0015] As another optional embodiment, the distance between the entrance of each self-priming hole on the upper surface of the self-priming cup and the edge of the self-priming cup is smaller than the distance between the exit of the self-priming hole on the lower surface of the self-priming cup and the edge of the self-priming cup.

[0016] As another optional embodiment, a connecting pipe is provided between the outlet of the separation pipe and the discharge port of the horizontal sand mill; the closer the connecting pipe is to the discharge port of the horizontal sand mill, the larger the pipe diameter is; and the separation paddle is provided in the connecting pipe.

[0017] As another optional embodiment, the grinding blocks include multiple first grinding blocks and multiple second grinding blocks; the second grinding blocks are all arranged on one side of the outer wall surface of the rotor close to the grinding outlet, and the first grinding blocks are all arranged 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.

[0018] As another optional implementation, a plurality of third protrusions are provided on the inner wall surface of the grinding cylinder near the grinding outlet.

[0019] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0020] The horizontal sand mill of the embodiment of the present invention adopts vertical discharging, and controls the movement trajectory and speed of the material and the grinding medium in the discharging channel through the separation pipe, separation paddle, and self-suction cup, so as to realize the separation of the material and the grinding medium, so as to limit the entry of the grinding medium into the discharging channel, avoid the grinding medium from clogging the discharging channel, and facilitate the material discharging; the grinding rotor and the grinding cylinder realize the intra-cavity circulation of the grinding medium in the grinding cavity through the grinding blocks and protrusions, which can not only avoid the accumulation of the grinding medium at the outlet of the grinding cylinder, but also increase the volume fraction of the grinding medium on the material inlet side of the grinding cylinder, thereby improving the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a structural schematic diagram of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0023] Figure 2 It is another structural schematic diagram of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0024] Figure 3 It is a partial structural schematic diagram of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0025] Figure 4 It is another partial structural schematic diagram of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0026] Figure 5It is a structural schematic diagram of a separation paddle of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0027] Figure 6 It is a structural schematic diagram of a self-suction disc of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0028] Figure 7 It is another structural schematic diagram of a self-suction disc of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0029] Figure 8 It is a structural schematic diagram of a centrifugal separation device of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0030] Fig. 9 It is a schematic cross-sectional structure diagram of a centrifugal separation device of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0031] Fig.10 It is a structural schematic diagram of a grinding rotor of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0032] Fig.11 It is another structural schematic diagram of a grinding rotor of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0033] Fig.12 It is a structural schematic diagram of a grinding cylinder of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0034] Fig.13 It is a structural schematic diagram of a convex block of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0035] Fig.14 It is another structural schematic diagram of a grinding cylinder of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0036] Fig.15 It is a fluid simulation result diagram of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention;

[0037] Fig.16 It is a partially enlarged schematic diagram of a fluid simulation result diagram of a horizontal sand mill with vertical centrifugal discharge disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] 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.

[0039] See also Figures 1 to 16 The embodiment of the present invention discloses a horizontal sand mill with vertical centrifugal discharge, comprising a rotatable grinding rotor 1 and a grinding cylinder 2, wherein the main body of the grinding rotor 1 is a cylindrical structure, and a plurality of grinding blocks 3 for grinding are arranged on its outer wall surface; the grinding rotor 1 is arranged in the inner cavity of the grinding cylinder 2; an outlet 21 of the grinding cylinder 2 is arranged on the cylindrical outer wall on one side of the grinding cylinder 2, and the outlet is connected to the discharge port 4 of the horizontal sand mill, and the feed port 5 of the horizontal sand mill is arranged on the other side of the grinding cylinder 2; wherein,

[0040] A separation pipe 6 is provided between the outlet of the grinding cylinder 2 and the discharge port 4 of the horizontal sand mill, and a first protrusion 61 is provided on the inner wall of the separation pipe 6. The first protrusion 61 is a wave-shaped structure having a plurality of continuous protrusions, and the closer the protrusion is to the discharge port 4 of the horizontal sand mill, the higher the height on the inner wall of the separation pipe 6;

[0041] A separation paddle 7 is provided between the outlet of the separation pipe 6 and the discharge port 4 of the horizontal sand mill. The separation paddle 7 includes a paddle 71 and a hub 72 for mounting the paddle 71 and driving the paddle 71 to rotate. The separation paddle 7 imparts a vertical downward velocity component to the material through the paddle 71.

[0042] In this embodiment, the inner cavity of the grinding cylinder 2 is a cylindrical structure with two ends, and the feed port of the horizontal sand mill is arranged on the cylindrical outer wall on the other side of the grinding cylinder 2 or on the end surface of the inner cavity.

[0043] In this embodiment, see Fig.15 , 16 The fluid simulation diagram shows that when the grinding ball (grinding medium) collides with the protrusion 61, a velocity component is obtained that is obliquely inward and returns to the grinding area of ​​the grinding cylinder 2 under the drag force of the downward moving material, so that Fig.15 , 16In the figure, the position where the material has a higher vertical velocity component is located below the separation paddle 7 and in the middle area of ​​the separation pipe 6, and the velocity direction is downward. Due to the Coanda effect, the material flow velocity is lower at the wall of the separation pipe 6, and its vertical velocity component direction is upward. Due to the pressure difference between the grinding chamber and the discharge port, the material on the wall of the 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 energization of the separation paddle 7 and its own gravity. In this way, the separation of the material and the grinding balls is achieved, and the grinding balls are restricted from entering the non-grinding area above, avoiding leakage of the balls at the discharge port 4. Since the movement direction of the material in the middle area of ​​the separation pipe 6 is downward, the grinding balls can quickly enter the cavity of the grinding cylinder 2 for circulation downward, avoiding blockage in the area at the outlet of the grinding cylinder 2, increasing the volume fraction of the grinding medium on the material inlet side of the grinding cylinder 2, and improving the grinding efficiency.

[0044] In an optional embodiment, the surface of the raised portion of the first protrusion 61 is a wave curve in the axial section of the separation pipe 6, and the curvature radius of the wave curve corresponding to the raised portion closer to the discharge port 4 is larger.

[0045] by Figure 2 , 4 For example, the separation pipe 6 is installed in the area where the vertical discharge and the grinding cylinder are connected. A progressive wave-shaped separation and stripping protrusion 61 is provided in the separation pipe 6, and the curvature radius of the protrusion decreases from top to bottom. When the sand mill is working, due to the energization of the grinding rotor 1 and the separation paddle 7 and the difference in the ratio of the diameter of the grinding cylinder 2 and the intersecting diameter of the separation pipe 6, when the material flows through the separation pipe 6, the material close to the pipe wall flows upward, and the material in the middle area of ​​the separation pipe 6 flows downward; when the material and the zirconium ball flow through the progressive wavy curve separation and stripping protrusion 61, due to the Coanda effect, the material can flow along the wall surface, and the wavy protrusion structure can block a part of the zirconium balls moving upward along the wall surface. In addition, when the grinding ball collides with the protrusion 61, it obtains an oblique inward velocity component and loses part of the kinetic energy, and returns to the grinding area of ​​the grinding cylinder 2 under the action of the drag force of the downward moving material; the progressive wavy curve separation and stripping protrusion 61 is set to reduce the vertical upward velocity component and kinetic energy of the zirconium ball, and the design of the protrusion with a gradually decreasing curvature radius from top to bottom can play a role in graded stripping and separation of the material and the grinding medium, and can also reduce the along-the-way resistance of the material flowing along the wall surface.

[0046] In another optional embodiment, the hub 72 is a cylinder, and the blades 71 are mounted on the cylindrical surface of the hub 72;

[0047] The blade 71 is an arc plate bent based on an arc line. The angle between the tangent direction of the arc line corresponding to the upper end of the blade 71 and the axial direction of the hub 72 is 0 to 75 degrees. The tangent direction of the arc line corresponding to the lower end of the blade 71 is parallel to the axial direction of the hub 72.

[0048] 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 smaller than the distance between the lower end of the blade 71 and the cylindrical surface of the hub 72.

[0049] by Figure 3 , 4 For example, three blades 71 are arranged on the outside of the separation paddle 7. The blades 71 are evenly spaced in the circumferential direction and rotate clockwise when viewed from top to bottom. The cross section of the blade 71 is designed as an arc line. The tangent direction of the uppermost arc line forms an angle of 30° with the vertical direction, and the tangent direction of the lowermost arc line is parallel to the vertical direction. The outer diameter of the lower end of the blade 71 is larger than the outer diameter of the upper end. When the separation paddle 7 is working, the material moves obliquely downward under the drive of the blades. The blade arc design cooperates with the opening angle of the self-suction cup 8 to give the material a vertical downward velocity component and reduce the running resistance. The outer diameter of the lower end of the blade 71 is larger than the outer diameter of the upper end, which increases the energy size of the material at the bottom end, and cooperates 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.

[0050] In another optional embodiment, a self-suction disc 8 is further included; the self-suction disc 8 is arranged above the separation paddle 7 and below the discharge port 4 of the horizontal sand mill;

[0051] The self-suction cup 8 is provided with a plurality of self-suction holes 81 , which are through holes and whose apertures gradually decrease from the upper surface to the lower surface of the self-suction cup 8 .

[0052] In yet another optional embodiment, the self-priming holes 81 are evenly distributed in the circumferential direction of the self-priming cup 8 .

[0053] In another optional embodiment, the distance between the entrance of each self-priming hole 81 on the upper surface of the self-priming cup 8 and the edge of the self-priming cup 8 is smaller than the distance between the exit of the self-priming hole 81 on the lower surface of the self-priming cup 8 and the edge of the self-priming cup 8.

[0054] by Figure 3 , 67 as an example, the self-suction disc 8 is installed above the separation paddle 7, and five self-suction holes 81 are arranged in the middle. The self-suction holes 81 are evenly spaced in the circumferential direction, and the aperture 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 part, that is, the opening is obliquely downward from the outside to the inside. When the self-suction disc 8 is working, the material moves from top to bottom through the self-suction hole, and gives the material a centripetal velocity component, and cooperates with the separation paddle 7 to transport the slurry with a high content of zirconium balls into the grinding chamber; in addition, the existence of the self-suction hole 81 can reduce the pressure difference in the upper area of ​​the separation paddle 7, thereby alleviating the discharge pressure of the vertical discharge chamber.

[0055] In another optional embodiment, a connecting pipe 9 is provided between the outlet of the separation pipe 6 and the discharge port 4 of the horizontal sand mill; the closer the connecting pipe 9 is to the discharge port 4 of the horizontal sand mill, the larger the pipe diameter is; and the separation paddle 7 is provided in the connecting pipe 9.

[0056] In this embodiment, optionally, the wall surface of the connecting pipe 9 may be a truncated cone surface with a vertex, and the vertex of the truncated cone surface is located below the connecting pipe 9; through the truncated cone surface design, when the material moves from top to bottom, the cross-sectional area gradually decreases, that is, the flow channel gradually shrinks, and the flow velocity will increase; and when moving from bottom to top, the cross-sectional area gradually expands, that is, the flow channel gradually expands and gravity acts at the same time, the material flow rate will decrease.

[0057] See also Figure 8 , 9 In another optional embodiment, the centrifugal separator 10 is further included, wherein the inlet 101 of the centrifugal separator 10 is arranged on the outer surface thereof, the outlet 102 of the centrifugal separator 10 is arranged inside the centrifugal separator 10, and the outlet of the centrifugal separator 10 is connected with the discharge port 4 of the horizontal sand mill. The centrifugal separator 10 is in a rotating state when working. Due to the incompressibility of the material, the material outside the centrifugal separator 10 can flow into the separator 10 by overcoming the dynamic pressure given by the rotation of the separator 10 and the local resistance of the channel, and then enter the discharge port 4 of the horizontal sand mill through the outlet of the centrifugal separator 10. Since the grinding medium has a larger volume and density than the material, the resistance to escape is greater, so the centrifugal separator 10 can effectively separate the grinding medium in the material.

[0058] See also Figure 2 , 4 In yet another optional embodiment, it further includes a discharge channel 11; 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.

[0059] In another optional embodiment, the grinding blocks 3 include multiple first grinding blocks 31 and multiple second grinding blocks 32; the second grinding blocks 32 are all arranged on the side of the outer wall surface of the grinding rotor 1 close to the grinding outlet, and the first grinding blocks 31 are all arranged on the other side of the outer wall surface of the grinding rotor 1; all the first grinding blocks 31 are evenly distributed on the outer wall surface of the rotor along the axial and circumferential directions of the grinding rotor 1; the second grinding blocks 32 are evenly distributed circumferentially and spirally wrapped around the outer wall surface of the grinding rotor 1.

[0060] by Fig.11 For example, the grinding rotor 1 is driven by a motor to rotate toward the inside of the figure (counterclockwise when viewed from the left), driving the zirconium balls (a type of grinding medium ball) to collide and squeeze each other, crushing the grinding material, and the adjacent grinding blocks 3 at the outlet are installed obliquely, which impart a velocity component axially toward the feed inlet to the zirconium balls during rotation, effectively preventing the zirconium balls from accumulating on 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 blocks 31 far from the grinding outlet are commonly evenly and equidistantly distributed. 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, while the second grinding blocks 32 close to the grinding outlet are designed to be spirally wound. As the grinding rotor 1 rotates, it can apply a force toward the feed inlet to the grinding medium, so that the grinding medium can circulate in the grinding cavity, thereby preventing the grinding medium from accumulating at the outlet of the grinding cylinder 2.

[0061] In an optional embodiment, there is an angle between the normal direction of the side surface of the second grinding block 32 facing the feed port of the horizontal sand mill and the circumferential direction of the grinding rotor 1, and the angle is 15 to 75 degrees.

[0062] In yet another optional embodiment, the second grinding block 32 is a cylinder with a circular key-shaped cross-section.

[0063] In yet another optional embodiment, the height of the second grinding block 32 is lower than that of the first grinding block 31 .

[0064] In yet another optional embodiment, the grinding block 3 is made of zirconium oxide and is fixed to the grinding rotor 1 by bolts.

[0065] by Figures 10-11For example, the grinding block 31 at the inlet end of the grinding rotor 1 is divided into four equal parts in the circumferential direction, and the adjacent grinding blocks 31 in the axial direction are not misaligned; the grinding block 32 at the outlet end is divided into four equal parts in the circumferential direction, and the adjacent grinding blocks 32 in the axial direction are misaligned by 22.5°. The parallel symmetry planes on both sides of the grinding block 32 form an angle of 30° with the vertical direction, and the height of the grinding block 32 is 2mm lower than the inlet end grinding block 31. The material of the grinding block 3 can be preferably zirconium oxide and PU rubber coating. When the material is zirconium oxide, the grinding block 3 can be fixed to the grinding rotor 1 by bolts, which is convenient for wear and replacement. In addition, the distribution and arrangement of the rod pin grinding block 3 of the grinding rotor 1 is not limited to the above method, and the overall arrangement of the grinding block 3 can be installed with reference to the outlet form. By staggering the adjacent axial grinding blocks 3, the continuity of the axial velocity component of the zirconium ball toward the material inlet can be improved, and the circulation efficiency can be improved. In addition, the volume fraction of the grinding medium on the material inlet side of the grinding cylinder 2 can be increased, thereby improving the grinding efficiency; finally, the height of the outlet grinding block 32 is lower than the inlet grinding block 31, which can reduce the initial velocity of the zirconium ball at the outlet of the grinding cylinder 2 after energization, thereby reducing the probability of the zirconium ball entering the vertical separation outlet area.

[0066] In yet another optional embodiment, a plurality of third protrusions 22 are provided on the inner wall surface of the grinding cylinder 2 near the grinding outlet.

[0067] In yet another optional embodiment, the third protrusions 22 are distributed in a spiral shape on the inner wall surface of the grinding cylinder 2 .

[0068] In yet another optional embodiment, there is an angle between the normal direction of the side surface of the third protrusion 22 facing the feed inlet of the horizontal sand mill and the circumferential direction of the grinding cylinder 2, and the angle is 0 to 60 degrees.

[0069] In yet another optional embodiment, the edges of the third protrusion 22 are rounded.

[0070] by Figures 12-14For example, a vertical discharge opening is provided at the outlet of the grinding cylinder 2, and a protrusion 22 with adjacent axial offset (22.5°) is provided on the wall near the opening in the circumferential direction, and the protrusion 22 forms an angle of 30° with the central axis of the grinding cylinder 2 in the length direction. In terms of shape, the front face 221 of the protrusion 22 is perpendicular to the grinding cylinder 2 at the connection with the grinding cylinder 2, and the outer end is chamfered and then 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 and the radius is smaller than the front face. When the zirconium balls (grinding balls) move to the convex area of ​​the grinding cylinder 2, they obtain a velocity component along the axial direction of the grinding cylinder 2, so that the zirconium balls near the inner wall surface of the outlet end of the grinding cylinder 2 circulate toward the inlet side, reducing the probability of zirconium balls accumulation at the outlet end of the grinding cylinder 2, increasing the collision frequency of zirconium balls in the grinding area, and thus improving the grinding efficiency; the inclination angle of the chamfered face of the convex block 22 and the inclination angle of the grinding block 32 at the outlet end of the grinding rotor 1 are coordinated in spatial geometry during rotation operation, and with the cooperation of the two, the probability of zirconium balls accumulation at the outlet end of the grinding cylinder 2 is further reduced; the rounding of the outer end of the convex block 22 can reduce the contact resistance and local stress between the convex block 22 and the grinding medium and material, thereby reducing the degree of wear on the outer end of the convex block 22.

[0071] 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 vertical centrifugal discharge horizontal sand mill, comprising a rotatable grinding rotor and a grinding drum, wherein the main body of the grinding rotor is a cylindrical structure, and a plurality of grinding blocks for grinding are arranged on its outer wall surface; the grinding rotor is arranged in the inner cavity of the grinding drum; an outlet of the grinding drum is arranged on the cylindrical outer wall on one side of the grinding drum, and the outlet is connected to the discharge port of the horizontal sand mill, and the feed port of the horizontal sand mill is arranged on the other side of the grinding drum; characterized in that A separation pipe is provided between the outlet of the grinding cylinder and the discharge port of the horizontal sand mill, and a first protrusion is provided on the inner wall of the separation pipe. The first protrusion is a wave-shaped structure having a plurality of continuous protrusions, and the closer the protrusion is to the discharge port of the horizontal sand mill, the higher the height on the inner wall of the separation pipe; A separation paddle is also provided between the outlet of the separation pipe and the discharge port of the horizontal sand mill. The separation paddle includes a blade and a hub for mounting the blade and driving the blade to rotate. The separation paddle imparts a vertical downward velocity component to the slurry through the blade.

2. The horizontal sand mill according to claim 1, characterized in that: It also includes a self-suction disc; the self-suction disc is arranged above the separation paddle and below the discharge port of the horizontal sand mill; The self-suction cup is provided with a plurality of self-suction holes, which are through holes and whose apertures gradually decrease 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 raised portion of the first protrusion is a wave curve in the axial section of the separation pipe, and the curvature radius of the wave curve corresponding to the raised portion closer to the discharge port is larger.

4. The horizontal sand mill according to claim 1, characterized in that: The propeller hub is a cylinder, and the propeller blades are mounted on the cylindrical surface of the propeller hub; The blade is an arc plate bent based on an arc line, the angle between the tangent direction of the arc line corresponding to the upper end of the blade and the axial direction of the hub is 0 to 75 degrees, and the tangent direction of the arc line corresponding to the lower end 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: There are multiple blades 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 smaller 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 in the circumferential direction of the self-priming cup.

7. The horizontal sand mill according to claim 2 or 6, characterized in that: The distance between the entrance of each self-priming hole on the upper surface of the self-priming cup and the edge of the self-priming cup is smaller than the distance between the exit 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 as the part closer to the discharge port of the horizontal sand mill; and the separation paddle is provided in the connecting pipe.

9. The horizontal sand mill according to claim 1, characterized in that: The grinding blocks include a plurality of first grinding blocks and a plurality of second grinding blocks; the second grinding blocks are all arranged on one side of the outer wall surface of the rotor close to the outlet of the grinding cylinder, and the first grinding blocks are all arranged 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 in the circumferential direction 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 surface of the grinding cylinder is provided with a plurality of third protrusions at positions close to the grinding outlet.

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