Grinding structure of horizontal sand mill

Abstract

The utility model discloses a grinding structure of a horizontal sand mill. The grinding structure comprises an inner cylinder and a rotatable rotor, a main body of the rotor is of a cylindrical structure, and a plurality of protruding blocks used for grinding are arranged on the outer wall face of the main body. The rotor is arranged in an inner cavity of the inner cylinder; a grinding outlet is formed in the cylindrical outer wall on one side of the inner barrel, the grinding outlet is communicated with a discharge port of the horizontal sand mill, and a feed port of the horizontal sand mill is formed in the other side of the inner barrel; the horizontal sand mill is used for vertical discharging; the protruding blocks comprise the multiple first protruding blocks and the multiple second protruding blocks, the second protruding blocks are all arranged on the side, close to the grinding outlet, of the outer wall face of the rotor, and the first protruding blocks are all arranged on the other side of the outer wall face of the rotor. All the first protruding blocks are evenly distributed on the outer wall face of the rotor in the axial direction and the circumferential direction of the rotor. The second protruding blocks are evenly distributed in the circumferential direction and spirally surround the outer wall face of the rotor. Grinding media can be prevented from being accumulated at the outlet of the inner cylinder.

Description

TECHNICAL FIELD

[0001] The utility model relates to horizontal sand mill technical field especially relates to a kind of grinding structure of horizontal sand mill. BACKGROUND

[0002] Sand mill is a kind of machine that realizes the smashing grinding of material and grinding medium (for example grinding ball) in grinding cavity by rotor drive to make them collide and extrude, and material is decomposed into tiny particles in the process of mutual collision due to the different specific gravity and hardness of material and grinding medium.Current sand mill includes horizontal sand mill, vertical sand mill, basket sand mill and the like.

[0003] Generally, horizontal sand mill is horizontal feeding and horizontal discharging, and vertical discharging horizontal sand mill begins to appear in prior art, for example, patent 202320967243.7 uses vertical grinding cylinder, moves the original horizontal grinding area to vertical direction, compared with horizontal output, it can occupy less space.However, vertical output is prone to the situation that grinding medium is accumulated at the inlet of vertical grinding cylinder (that is, at the outlet of inner cylinder), which leads to poor grinding effect and inconvenient discharging. SUMMARY

[0004] The technical problem to be solved by the utility model lies in providing a kind of grinding structure of horizontal sand mill, which can avoid the accumulation of grinding medium at the outlet of inner cylinder.

[0005] In order to solve the above technical problem, the utility model discloses a kind of grinding structure of horizontal sand mill, including inner cylinder and rotatable rotor;The main body of the rotor is a cylindrical structure, and a plurality of convex blocks for grinding are provided on the outer wall surface thereof;The rotor is arranged in the inner cavity of the inner cylinder;A grinding outlet is provided on the cylindrical outer wall of one side of the inner cylinder, which is communicated with the discharge port of the horizontal sand mill, and the feeding port of the horizontal sand mill is arranged on the other side of the inner cylinder;

[0006] The convex block includes a plurality of first convex blocks and a plurality of second convex blocks, the second convex block is arranged on one side of the outer wall surface of the rotor close to the grinding outlet, and the first convex block is arranged on the other side of the outer wall surface of the rotor;All the first convex blocks are uniformly distributed on the outer wall surface of the rotor along the axial direction and the circumferential direction of the rotor;The second convex block is uniformly distributed in the circumferential direction and spirally wrapped on the outer wall surface of the rotor.

[0007] As an optional embodiment, the normal direction of the side surface of the second convex block facing the feeding port of the horizontal sand mill and the circumferential direction of the rotor have an included angle, which is 15-75 degrees.

[0008] As another optional embodiment, the second convex block is a round key-shaped cross-section cylinder.

[0009] As a further alternative embodiment, the second protrusion has a height lower than the first protrusion.

[0010] As a further alternative embodiment, the protrusion material is zirconium oxide, and is fixed to the rotor by a bolt.

[0011] As a further alternative embodiment, the inner wall surface of the inner cylinder is provided with a plurality of third protrusions near the grinding outlet.

[0012] As a further alternative embodiment, the third protrusions are helically distributed on the inner wall surface of the inner cylinder.

[0013] As a further alternative embodiment, the normal direction of the side surface of the third protrusion facing the direction of the feed inlet of the horizontal sand mill forms an angle with the circumferential direction of the inner cylinder, and the angle is 0-60 degrees.

[0014] As a further alternative embodiment, the edges of the third protrusion are rounded.

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

[0016] The embodiments of the present application divide the protrusions on the rotor into two types according to the distance from the grinding outlet, the first protrusion far from the grinding outlet is evenly and equidistantly distributed, and the material flows to the grinding outlet after entering the inner cylinder from the feed inlet, and under the action of the drag force, the material and the grinding medium on the feed inlet side move towards the outlet side of the inner cylinder; the second protrusion near the grinding outlet is designed to be helically wrapped, and the rotation of the rotor can apply a force to the grinding medium towards the feed inlet, so that the grinding medium realizes circulation in the grinding cavity, thereby avoiding the accumulation of the grinding medium at the outlet of the inner cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Fig. 1 is a structure diagram of a grinding structure of a horizontal sand mill according to an embodiment of the present application;

[0019] Fig. 2 is a structure diagram of a rotor of a grinding structure of a horizontal sand mill according to an embodiment of the present application;

[0020] Fig. 3This is a structural schematic diagram of an inner cylinder of a grinding structure of a horizontal sand mill disclosed in an embodiment of the utility model;

[0021] Fig. 4 This is another structural schematic diagram of the inner cylinder of the grinding structure of a horizontal sand mill disclosed in an embodiment of the utility model;

[0022] Fig. 5 It is a structural schematic diagram of a protrusion on the inner cylinder of a grinding structure of a horizontal sand mill disclosed in an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts shall fall within the scope of protection of the present invention.

[0024] See also Figs. 1-5 The embodiment of the utility model discloses a grinding structure of a horizontal sand mill, comprising a rotatable rotor 1 and an inner cylinder 2; the main body of the rotor 1 is a cylindrical structure, and a plurality of protrusions 3 for grinding are provided on its outer wall; the rotor 1 is arranged in the inner cavity of the inner cylinder 2; a grinding outlet 4 is provided on the cylindrical outer wall of one side of the inner cylinder 2, and the grinding outlet is connected to the discharge port of the horizontal sand mill, and the feed port 5 of the horizontal sand mill is provided on the other side of the inner cylinder 2; the horizontal sand mill is a vertical discharge type;

[0025] The protrusions 3 include multiple first protrusions 31 and multiple second protrusions 32. The second protrusions 32 are all arranged on the side of the outer wall of the rotor 1 close to the grinding outlet, and the first protrusions 31 are all arranged on the other side of the outer wall of the rotor 1; all the first protrusions 31 are evenly distributed on the outer wall of the rotor 1 along the axial and circumferential directions of the rotor 1; the second protrusions 32 are evenly distributed circumferentially and spirally wrapped around the outer wall of the rotor 1.

[0026] In this embodiment, the inner cavity of the inner cylinder 2 is a cylindrical structure with two ends, and the feed port of the horizontal sand mill is provided on the outer wall of the other side of the inner cylinder 2 or on the end surface of the inner cavity.

[0027] by Figs. 1-2 For example, the rotor 1 is driven by the motor to move toward Fig. 2The inner side rotates (counterclockwise when viewed from the left), driving the zirconium balls (a type of grinding medium balls) to collide and squeeze with each other, crushing the grinding material. The adjacent protrusions 3 at the outlet end are installed obliquely, which impart an axial velocity component toward the feed inlet to the zirconium balls during rotation, effectively preventing the zirconium balls from accumulating on the outlet side of the inner cylinder 2.

[0028] In this embodiment, the protrusions 3 on the rotor 1 are divided into two types according to their distance from the grinding outlet. The first protrusions 31 far from the grinding outlet are commonly evenly and equidistantly distributed. After the material enters the inner cylinder 2 from the feed inlet and flows toward the grinding outlet, under the action of the drag force, the material carries the grinding media on the feed inlet side toward the outlet side of the inner cylinder; the second protrusions 32 close to the grinding outlet are spirally wound. As the rotor 1 rotates, it can apply force toward the feed inlet to the grinding media, so that the grinding media can circulate in the grinding chamber, thereby avoiding the accumulation of grinding media at the outlet of the inner cylinder 2.

[0029] In an optional embodiment, a normal direction of the side surface of the second protrusion 32 facing the feed port of the horizontal sand mill forms an angle with the circumferential direction of the rotor 1 , and the angle is 15 to 75 degrees.

[0030] In yet another optional embodiment, the second protrusion 32 is a cylinder with a circular key-shaped cross-section.

[0031] In yet another optional embodiment, the height of the second bump 32 is lower than that of the first bump 31 .

[0032] In another optional embodiment, the bump 3 is made of zirconium oxide and is fixed to the rotor 1 by bolts.

[0033] by Fig. 2 For example, the bumps 31 at the inlet end of rotor 1 are divided into four equal parts circumferentially, with adjacent bumps 31 aligned axially. The bumps 32 at the outlet end are divided into four equal parts circumferentially, with adjacent bumps 32 offset 22.5°. The parallel symmetry planes on either side of the bumps 32 form a 30° angle with the vertical, and the height of the bumps 32 is 2mm lower than that of the inlet end bumps 31. The bumps 3 are preferably made of zirconium oxide and PU rubberized. When made of zirconium oxide, the bumps 3 can be fixed to the rotor 1 with bolts, making them easy to replace after wear. Furthermore, the arrangement of the bumps 3 on rotor 1 is not limited to the above method; the overall bumps 3 can be installed similarly to the arrangement at the outlet end. By staggering the axially adjacent protrusions 3, the continuity of the axial velocity component of the zirconium balls toward the material inlet can be improved, and the circulation efficiency in the cavity can be improved. In addition, the volume fraction of the grinding medium on the material inlet side of the inner cylinder 2 can be increased, thereby improving the grinding efficiency; finally, the height of the protrusion 32 at the outlet end is lower than the protrusion 31 at the inlet end, which can reduce the initial velocity of the zirconium balls at the outlet end of the inner cylinder 2 after energization, thereby reducing the probability of the zirconium balls entering the vertical separation outlet area.

[0034] In another optional embodiment, a plurality of third protrusions 21 are provided on the inner wall surface of the inner cylinder 2 near the grinding outlet.

[0035] In another optional embodiment, the third protrusions 21 are distributed in a spiral pattern on the inner wall surface of the inner cylinder 2 .

[0036] In another optional embodiment, the normal direction of the side surface of the third protrusion 21 facing the feed inlet of the horizontal sand mill forms an angle with the circumferential direction of the inner cylinder 2, and the angle is 0 to 60 degrees.

[0037] In another optional embodiment, the edges of the third protrusion 21 are rounded.

[0038] by Figs. 3-5 For example, the outlet of inner tube 2 is provided with a vertical discharge opening. Near the opening, the wall surface is provided with adjacent protrusions 21, which are axially offset (22.5°) and divided into four equal parts in the circumferential direction. The length of the protrusions 21 forms a 30° angle with the central axis of inner tube 2. In terms of shape, the front surface 221 of the protrusion 21 is perpendicular to the inner tube 2 at its connection with the inner tube 2, and the outer end is chamfered and then rounded. The back surface 222 of the protrusion 21 is parallel to the tangent normal of the inner tube 2, and the outermost end is rounded with a smaller radius than the front surface. When the zirconium balls (grinding balls) move to the convex area of ​​the inner cylinder 2, they obtain a velocity component along the axial direction of the inner cylinder 2, so that the zirconium balls near the inner wall surface of the outlet end of the inner cylinder 2 circulate toward the inlet side, reducing the probability of zirconium balls accumulating at the outlet end of the inner cylinder 2, increasing the collision frequency of the zirconium balls in the grinding area, and thus improving the grinding efficiency; the inclination angle of the chamfered face of the convex block 21 and the inclination angle of the grinding block 32 at the outlet end of the rod pin rotor 1 are coordinated in spatial geometry during rotation. Under the cooperation of the two, the probability of zirconium balls accumulating at the outlet end of the inner cylinder 2 is further reduced; the rounded outer end of the convex block 21 can reduce the contact resistance and local stress between the convex block 21 and the grinding medium and material, thereby reducing the degree of wear on the outer end of the convex block 21.

[0039] The contents disclosed in the embodiments of the present invention only disclose preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can 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 various embodiments of the present invention.

Claims

1. A grinding structure of a horizontal sand mill, comprising an inner cylinder and a rotatable rotor; the main body of the rotor is a cylindrical structure, and a plurality of protrusions for grinding are arranged on the outer wall surface of the rotor; the rotor is arranged in the inner cavity of the inner cylinder; a grinding outlet is arranged on the cylindrical outer wall of one side of the inner cylinder, and the grinding outlet is communicated with the discharge port of the horizontal sand mill; the feeding port of the horizontal sand mill is arranged on the other side of the inner cylinder; the horizontal sand mill is a vertical discharge type, and the grinding structure is characterized in that, the protrusions comprise a plurality of first protrusions and a plurality of second protrusions; the second protrusions are arranged on one side of the outer wall surface of the rotor close to the grinding outlet; the first protrusions are arranged on the other side of the outer wall surface of the rotor; all the first protrusions are uniformly distributed on the outer wall surface of the rotor along the axial direction and the circumferential direction of the rotor; and the second protrusions are uniformly distributed and spirally arranged on the outer wall surface of the rotor.

2. The abrasive structure of claim 1, wherein, The normal direction of the side surface of the second protrusion facing the feeding port of the horizontal sand mill forms an angle with the circumferential direction of the rotor, and the angle is 15-75 degrees.

3. The abrasive structure according to claim 1 or 2, characterized in that, The second protrusion is a round key-shaped cross-section column.

4. The abrasive structure of claim 1, wherein, The height of the second protrusion is lower than that of the first protrusion.

5. The abrasive structure of claim 1, wherein, The material of the protrusion is zirconium oxide, and the protrusion is fixed on the rotor by bolts.

6. The abrasive structure of claim 1, wherein, A plurality of third protrusions are arranged on the inner wall surface of the inner cylinder close to the grinding outlet.

7. The abrasive structure of claim 6, wherein, The third protrusions are spirally arranged on the inner wall surface of the inner cylinder.

8. The abrasive structure of claim 7, wherein, The normal direction of the side surface of the third protrusion facing the feeding port of the horizontal sand mill forms an angle with the circumferential direction of the inner cylinder, and the angle is 0-60 degrees.

9. The grinding structure according to claim 6, characterized in that: The edges of the third protrusions are rounded.

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