A grinding rotor and a grinding assembly

Abstract

The present invention discloses a grinding rotor and a grinding assembly, wherein the grinding rotor comprises: a main shaft; a dynamic grinding unit, which comprises a plurality of dynamic grinding blocks connected around the outside of the main shaft, with the sides of the plurality of dynamic grinding blocks facing the rotation direction of the main shaft as grinding surfaces, the plurality of grinding surfaces are respectively planes, and the plurality of grinding surfaces are respectively provided with air holes penetrating the dynamic grinding blocks, and a plurality of the dynamic grinding units are arranged at intervals along the main shaft. The present invention greatly improves the efficiency and quality of material grinding, and has a simple structure and strong practicality.

Description

Technical Field

[0001] The invention relates to a grinding structure, in particular to a grinding rotor and a grinding component. Background Art

[0002] Horizontal sand mills generally use disc, round rod or disc-like rotor structures. Driven by power, the main shaft drives the rotor to rotate at high speed, thereby driving the rotation of the grinding medium to achieve collision or crushing of the material and refine the material. This type of rotor has a small contact area with the grinding medium during operation, making it difficult to effectively transmit power to the grinding medium, resulting in low grinding efficiency and failure to increase the solid content of the slurry. Therefore, there is an urgent need for a grinding rotor that can improve grinding efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a grinding rotor and a grinding assembly to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The solution of the present invention to solve its technical problem is:

[0005] A grinding rotor comprises: a main shaft; a dynamic grinding unit, which comprises a plurality of dynamic grinding blocks connected around the outside of the main shaft, with the sides of the plurality of dynamic grinding blocks facing the rotation direction of the main shaft as grinding surfaces, the plurality of grinding surfaces are respectively planes, and the plurality of grinding surfaces are respectively provided with air holes penetrating the dynamic grinding blocks, and the dynamic grinding units are arranged in plurality at intervals along the main shaft.

[0006] The technical solution has at least the following beneficial effects: the grinding rotor is installed in an external grinding device, such as a horizontal grinder, to drive the main shaft to rotate. When the main shaft rotates, it can drive multiple dynamic grinding blocks connected to its outside to rotate. Since the side of the multiple dynamic grinding blocks rotating toward the main shaft is a plane, the contact with the grinding medium can be increased, which is beneficial to the transmission of force to the grinding medium, and the movement speed of the grinding medium is increased, thereby enhancing the force of mutual collision between particles and improving the grinding efficiency. In addition, air holes are provided on the grinding surface. When the grinding block rotates, the air can be refined into small bubbles and brought into the fluid. Each refined bubble will adhere to the surface of the material, thereby ensuring that the ground slurry remains unsettled for a long time. In addition, in slurries with a large solid content, the slurry is relatively viscous, so that small bubbles do not overflow, and the stability of the effective slurry is improved. Therefore, the present invention greatly improves the efficiency and quality of material grinding, and has a simple structure and strong practicality.

[0007] As a further improvement of the above technical solution, multiple dynamic grinding blocks are respectively provided with reinforcing ribs between one side of the grinding surface and the main shaft, and multiple reinforcing ribs are respectively provided with inclined guide surfaces connected between the outer side of the main shaft and the grinding surface. Since the dynamic grinding block uses a plane to drive the grinding medium to move, the reinforcing ribs can be used to increase the connection contact area and strength between the dynamic grinding block and the main shaft, effectively preventing the dynamic grinding block from breaking due to excessive pressure when rotating, and the inclined guide surface on the reinforcing rib can guide the grinding medium, which is conducive to dispersing the impact stress of the grinding medium on the reinforcing rib and the outer side of the main shaft, and improving the stability of the connection structure.

[0008] As a further improvement of the above technical solution, a spherical concave surface is respectively provided on the side of the plurality of dynamic grinding blocks away from the grinding surface, and the air hole penetrates the spherical concave surface. When the dynamic grinding block rotates, it is equivalent to the fluid continuously impacting the grinding surface of the dynamic grinding block. At this time, the spherical concave surface of the dynamic grinding block can enhance the disturbance of the flow field through the Karman vortex street principle, so that there is a certain speed difference between the grinding medium particles, thereby enhancing the rolling friction between the grinding medium particles and accelerating the efficiency of material crushing.

[0009] As a further improvement of the above technical solution, a cavity is provided in the middle of the main shaft, and an opening is provided at one end of the main shaft to communicate with the cavity. The main shaft is provided with a cavity to reduce its weight, and the material can enter the cavity from the opening, increasing the space available for the material and the grinding medium to move, so that the grinding barrel of the same volume can grind more materials.

[0010] As another improvement of the above technical solution, a plurality of convection holes connected to the cavity are arranged at intervals on the outer side of the main shaft, and the plurality of convection holes and the plurality of movable grinding blocks are staggered along the axial direction of the main shaft, so that the plurality of convection holes arranged around the circumference of the main shaft are a convection group, and the convection group is arranged in plurality along the axial direction of the main shaft. The convection holes can accelerate the flow of the slurry, so that the slurry is mixed relatively evenly during the grinding process, thereby achieving relative concentration of the material particle size and reducing the agglomeration between the slurries.

[0011] As a further improvement of the above technical solution, a lifting bar is arranged in the cavity, and the lifting bar extends along the axial direction of the main shaft. During the rotation of the main shaft, the lifting bar in the cavity will lift the material to a high place, and then drop it from the high place, so that the lifting bar is used to increase the potential energy of the particles, and then the potential energy is converted into kinetic energy to grind and crush the material, thereby improving the energy utilization efficiency.

[0012] A grinding assembly comprises a shell, one end of which is provided with a feed port and the other end is provided with a discharge port; the above-mentioned grinding rotor, the main shaft extends into the shell and is rotatably connected with the shell, and the dynamic grinding unit is located in the shell; a fixed grinding unit, which is staggered with the dynamic grinding unit along the axial direction of the main shaft, and the fixed grinding unit comprises a plurality of fixed grinding blocks arranged around the shell, and the side surfaces of the plurality of fixed grinding blocks facing the main shaft are all arc-shaped, and a plurality of the fixed grinding units are arranged at intervals along the main shaft.

[0013] This technical solution has at least the following beneficial effects: the material to be ground is input into the outer shell from the feed port, and the main shaft part located outside the outer shell is connected to the external motor to drive the main shaft to rotate in the outer shell, and the main shaft can drive multiple movable grinding blocks to rotate relative to the fixed grinding block in the outer shell. Since the side of the fixed grinding block facing the main shaft is an arc surface, the accumulation of viscous slurry during rotation can be reduced, and the arc surface can be used to guide the fluid to impact the grinding surface of the fixed grinding block, and the speed of the middle position in the outer shell can be increased, which is conducive to solving the problem of low intermediate speed and high edge speed of ordinary rotors, thereby preventing the problem of large differences in product particle size caused by inconsistent slurry grinding due to uneven speed. In this way, the fluidity of the slurry in the outer shell can be further improved, the impact between the grinding medium and the material particles can be enhanced, and the efficiency and quality of material grinding can be greatly improved.

[0014] As a further improvement of the above technical solution, the plurality of fixed grinding blocks are detachably connected to the housing. When a fixed grinding block is seriously worn, the fixed grinding block can be removed from the device to replace a single fixed grinding block, thereby reducing maintenance costs and making installation more convenient.

[0015] As a further improvement of the above technical solution, the distance between the dynamic grinding block and the inner wall of the shell is between 12 mm and 14 mm. By controlling the distance between the dynamic grinding block and the inner wall of the shell within this range, the average collision energy can be increased while better controlling the energy consumption ratio of the grinder, thereby increasing the grinding intensity and enhancing the crushing efficiency of the material.

[0016] As a further improvement of the above technical solution, the distance between the dynamic grinding block and the fixed grinding block located beside it is between 26 mm and 30 mm. Similarly, by controlling the distance between the dynamic grinding block and the fixed grinding block within this range, the average collision energy can be increased while better controlling the energy consumption ratio of the grinder, thereby increasing the grinding intensity and enhancing the crushing efficiency of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0018] Figure 1 It is a three-dimensional view of the grinding rotor of the present invention.

[0019] Figure 2 It is a front view of the grinding assembly of the present invention.

[0020] Figure 3 yes Figure 2 Schematic diagram of the AA cross-section structure.

[0021] Figure 4 yes Figure 2 Schematic diagram of the BB cross-section structure.

[0022] Figure 5 It is a schematic diagram of the movement of materials when the main shaft rotates in the cavity of the present invention.

[0023] In the accompanying drawings: 1-main shaft, 11-convection hole, 12-lifting bar, 2-moving grinding block, 21-grinding surface, 22-air hole, 23-inclined guide surface, 24-spherical concave surface, 3-housing, 31-feed port, 32-discharge port, 4-fixed grinding block. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connecting accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0025] Reference Figure 1 A grinding rotor comprises: a main shaft 1; a dynamic grinding unit, which comprises a plurality of dynamic grinding blocks 2 connected around the outside of the main shaft 1, with the sides of the plurality of dynamic grinding blocks 2 facing the rotation direction of the main shaft 1 as grinding surfaces 21, the plurality of grinding surfaces 21 are respectively planes, and the plurality of grinding surfaces 21 are respectively provided with air holes 22 penetrating the dynamic grinding blocks 2, and the dynamic grinding unit is arranged at intervals along the main shaft 1.

[0026] In this grinding rotor, the grinding rotor is installed in an external grinding device, such as a horizontal grinder, to drive the main shaft 1 to rotate. When the main shaft 1 rotates, it can drive multiple dynamic grinding blocks 2 connected to the outside thereof to rotate. Since the side of the multiple dynamic grinding blocks 2 rotating toward the main shaft 1 is a plane, the contact with the grinding medium can be increased, which is beneficial to transmit force to the grinding medium, increase the movement speed of the grinding medium, thereby enhancing the force of mutual collision between particles and improving the grinding efficiency. In addition, air holes 22 are provided on the grinding surface 21. When the grinding block rotates, the air can be refined into small bubbles and brought into the fluid. Each refined bubble will adhere to the surface of the material, thereby ensuring that the ground slurry remains unsettled for a long time. In addition, in slurries with a large solid content, the slurry is relatively viscous, so that small bubbles do not overflow, and the stability of the effective slurry is improved. Therefore, the present invention greatly improves the efficiency and quality of material grinding, and has a simple structure and strong practicality.

[0027] In order to prevent the air holes 22 from being blocked due to the large diameter of the grinding medium particles and the high viscosity of the slurry, the diameter of the air holes 22 can be designed to be 2 to 3 times larger than the particle grinding medium.

[0028] The traditional round rod-shaped rotor or disc-shaped rotor has fewer positions that are in contact with the grinding medium and subjected to force during rotation. When the grinding surface 21 on the dynamic grinding block 2 is a plane, it is necessary to strengthen the connection structure of the dynamic grinding block 2. In this embodiment, multiple dynamic grinding blocks 2 are respectively provided with reinforcing ribs between one side of the grinding surface 21 and the main shaft 1, and multiple reinforcing ribs are respectively provided with inclined guide surfaces 23 connected between the outer side of the main shaft 1 and the grinding surface 21. Since the dynamic grinding block 2 uses a plane to drive the grinding medium to move, the reinforcing ribs can be used to increase the connection contact area and strength between the dynamic grinding block 2 and the main shaft 1, effectively preventing the dynamic grinding block 2 from breaking due to excessive pressure during rotation, and the inclined guide surface 23 on the reinforcing ribs can guide the grinding medium, which is conducive to dispersing the impact stress of the grinding medium on the reinforcing ribs and the outer side of the main shaft 1, and improving the stability of the connection structure.

[0029] Furthermore, a spherical concave surface 24 is respectively provided on one side of the plurality of dynamic grinding blocks 2 away from the grinding surface 21, and the air hole 22 penetrates the spherical concave surface 24. When the dynamic grinding block 2 rotates, it is equivalent to the fluid continuously impacting the grinding surface 21 of the dynamic grinding block 2. At this time, the spherical concave surface 24 of the dynamic grinding block 2 can enhance the disturbance of the flow field through the Karman vortex street principle, so that there is a certain speed difference between the grinding medium particles, thereby enhancing the rolling friction between the grinding medium particles and accelerating the efficiency of material crushing.

[0030] The main shaft 1 may be a solid structure, but in this embodiment, a cavity is provided in the middle of the main shaft 1, and an opening connected to the cavity is provided at one end of the main shaft 1. The main shaft 1 has a cavity to reduce its weight, and the material can enter the cavity from the opening, increasing the space available for the movement of the material and the grinding medium, so that the grinding barrel of the same volume can grind more materials.

[0031] Furthermore, a plurality of convection holes 11 connected to the cavity are arranged at intervals on the outside of the main shaft 1, and the plurality of convection holes 11 and the plurality of movable grinding blocks 2 are staggered along the axial direction of the main shaft 1, so that the plurality of convection holes 11 arranged circumferentially around the main shaft 1 form a convection group, and the convection group is provided with a plurality of holes along the axial direction of the main shaft 1. The convection holes 11 can accelerate the flow of the slurry, so that the slurry is mixed relatively evenly during the grinding process, thereby achieving relative concentration of the material particle size and reducing the agglomeration between the slurries.

[0032] In order to further improve the grinding effect of the material in the cavity of the spindle 1, Figure 5 As shown, in this embodiment, a lifting bar 12 is arranged in the cavity, and the lifting bar 12 extends along the axial direction of the main shaft 1. There are multiple lifting bars 12 in the inner circumferential array of the main shaft 1. During the rotation of the main shaft 1, the lifting bars 12 in the cavity will lift the material to a high place, and then drop it from a high place. In this way, the lifting bars 12 are used to increase the potential energy of the particles, and then the potential energy is converted into kinetic energy to grind and crush the materials, thereby improving the efficiency of energy utilization. When the angular velocity is greater than or equal to, the particles move centrifugally, and there is no collision between the particles, so this speed is not conducive to material grinding; when the angular velocity of the rotor is, there is both collision between the particles and mutual friction between the particles, which is conducive to material grinding. When the angular velocity of the rotor is, there is rolling friction between the particles, which has a strong effect on the material. Therefore, the role of the lifting bar 12 is to lift the particles to a higher place as much as possible, increase the potential energy of the particles, and increase the collision force between the particles.

[0033] like Figure 2 , Figure 3 and Figure 4 A grinding assembly comprises a shell 3, one end of which is provided with a feed port 31, and the other end is provided with a discharge port 32; the above-mentioned grinding rotor, the main shaft 1 extends into the shell 3 and is rotatably connected with the shell 3, and the dynamic grinding unit is located in the shell 3; the fixed grinding unit is staggered with the dynamic grinding unit along the axial direction of the main shaft 1, and the fixed grinding unit comprises a plurality of fixed grinding blocks 4 arranged around the shell 3, and the side surfaces of the plurality of fixed grinding blocks 4 facing the main shaft 1 are all arc-shaped, and a plurality of the fixed grinding units are arranged at intervals along the main shaft 1.

[0034] In this grinding assembly, the material to be ground is input into the outer shell 3 from the feed port 31, and the part of the main shaft 1 located outside the outer shell 3 is connected to the external motor to drive the main shaft 1 to rotate in the outer shell 3. The main shaft 1 can drive multiple movable grinding blocks 2 to rotate relative to the fixed grinding block 4 in the outer shell 3. Since the side of the fixed grinding block 4 facing the main shaft 1 is an arc surface, the accumulation of viscous slurry during the rotation process can be reduced, and the arc surface can be used to guide the fluid to collide with the grinding surface of the fixed grinding block 4, and the speed of the middle position in the outer shell 3 can be increased, which is conducive to solving the problem of low intermediate speed and high edge speed of ordinary rotors, thereby preventing the problem of large differences in product particle size caused by inconsistent slurry grinding due to uneven speed. In this way, the fluidity of the slurry in the outer shell 3 can be further improved, the collision between the grinding medium and the material particles can be enhanced, and the efficiency and quality of material grinding can be greatly improved.

[0035] Here, the arc surface on the fixed grinding block 4 may extend in an arc shape along the rotation direction of the main shaft 1 toward the main shaft 1 , thereby improving the fluidity of the fluid to the main shaft 1 .

[0036] In some embodiments, the plurality of fixed grinding blocks 4 are detachably connected to the outer shell 3. When the fixed grinding block 4 is greatly worn, the fixed grinding block 4 can be removed from the equipment separately to achieve the replacement of a single fixed grinding block 4, reduce maintenance costs, and make installation more convenient. The outer shell 3 includes a shell and a cylinder, and the feed port 31 and the discharge port 32 are respectively arranged on both sides of the outer shell 3, and the cylinder is connected to the inner side of the shell. The cylinder is arranged with multiple cylinders along its axial direction, and the two adjacent cylinders are detachably connected. The plurality of fixed grinding blocks 4 in each fixed grinding unit are detachably connected to the inner side of a single cylinder. In this way, by removing each cylinder, each fixed grinding unit can be maintained separately, further improving the convenience of overall disassembly and maintenance.

[0037] In some embodiments, the distance between the dynamic grinding block 2 and the inner wall of the shell 3 is between 12 mm and 14 mm. By controlling the distance between the dynamic grinding block and the inner wall of the shell within this range, the average collision energy can be increased while better controlling the energy consumption ratio of the grinder, thereby increasing the grinding intensity and enhancing the efficiency of material crushing. In actual tests, the average collision energy decreases as the distance between the dynamic grinding block and the inner wall of the shell gradually increases, while the energy ratio first increases and then decreases as the distance between the dynamic grinding block and the inner wall of the shell increases. The distance between the dynamic grinding block and the inner wall of the shell is further preferably 12 mm.

[0038] In some embodiments, the distance between the dynamic grinding block and the fixed grinding block located beside it is between 26 mm and 30 mm. Similarly, by controlling the distance between the dynamic grinding block and the fixed grinding block within this range, the average collision energy can be increased while better controlling the energy consumption ratio of the grinder, thereby increasing the grinding intensity and enhancing the efficiency of material crushing. In actual tests, the average collision energy first increases and then decreases with the distance between the dynamic grinding block and the fixed grinding block located beside it, and the energy efficiency ratio also first increases and then decreases with the distance between the dynamic grinding block and the fixed grinding block located beside it. Based on the two, the distance between the dynamic grinding block and the fixed grinding block located beside it is preferably 28 mm.

[0039] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A grinding rotor, characterized in that: include: spindle(1); A dynamic grinding unit, comprising a plurality of dynamic grinding blocks (2) connected around the outside of a main shaft (1), with the side surfaces of the plurality of dynamic grinding blocks (2) facing the rotation direction of the main shaft (1) being grinding surfaces (21), the plurality of grinding surfaces (21) being planes, the plurality of grinding surfaces (21) being respectively provided with air holes (22) penetrating the dynamic grinding blocks (2), the plurality of dynamic grinding units being arranged at intervals along the main shaft (1), the plurality of dynamic grinding blocks (2) being respectively provided with reinforcing ribs on one side of the grinding surface (21) and between the main shaft (1), the plurality of reinforcing ribs being respectively provided with inclined guide surfaces (23) connected between the outside of the main shaft (1) and the grinding surface (21), the plurality of dynamic grinding blocks (2) being respectively provided with spherical concave surfaces (24) on one side away from the grinding surface (21), the air holes (22) penetrating the spherical concave surfaces (24).

2. A grinding rotor according to claim 1, characterized in that: A cavity is provided in the middle of the main shaft (1), and an opening communicating with the cavity is provided at one end of the main shaft (1).

3. A grinding rotor according to claim 2, characterized in that: A plurality of convection holes (11) connected to the cavity are arranged at intervals on the outside of the main shaft (1); the plurality of convection holes (11) and the plurality of movable grinding blocks (2) are staggered along the axial direction of the main shaft (1); the plurality of convection holes (11) arranged circumferentially around the main shaft (1) form a convection group; a plurality of the convection groups are arranged along the axial direction of the main shaft (1).

4. A grinding rotor according to claim 2, characterized in that: A lifting strip (12) is arranged in the cavity, and the lifting strip (12) extends along the axial direction of the main shaft (1).

5. A grinding assembly, characterized in that: include A housing (3) having a feed inlet (31) at one end and a discharge outlet (32) at the other end; The grinding rotor according to any one of claims 1 to 4, wherein the main shaft (1) extends into the housing (3) and is rotatably connected to the housing (3), and the dynamic grinding unit is located in the housing (3); A fixed grinding unit is staggered with the dynamic grinding unit along the axial direction of the main shaft (1), the fixed grinding unit comprises a plurality of fixed grinding blocks (4) arranged around the housing (3), a side surface of the plurality of fixed grinding blocks (4) facing the main shaft (1) is all in the shape of an arc, and a plurality of the fixed grinding units are arranged at intervals along the main shaft (1).

6. A grinding assembly according to claim 5, characterized in that: The plurality of fixed grinding blocks (4) are respectively detachably connected to the outer shell (3).

7. A grinding assembly according to claim 5, characterized in that: The distance between the dynamic grinding block (2) and the inner wall of the outer shell (3) is between 12 millimeters and 14 millimeters.

8. A grinding assembly according to claim 5, characterized in that: The distance between the movable grinding block (2) and the fixed grinding block (4) located next to it is between 26 mm and 30 mm.

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