CN213050880U - Ball mill - Google Patents

Abstract

The utility model relates to a comminuted technical field discloses a ball mill. The ball mill comprises a grinding bin, a feeding assembly, a driving assembly, a discharging assembly and a discharging filter screen, wherein an inner cavity of the grinding bin is a conical cavity with a horizontal axis, and a plurality of grinding balls are arranged in the grinding bin; the feeding assembly is connected to the small-caliber end of the grinding bin and is configured to feed materials to the grinding bin; the driving assembly is configured to drive the grinding bin to rotate along the axis of the inner cavity of the driving assembly; the ejection of compact subassembly is connected in the big bore end of grinding feed bin, and ejection of compact filter screen setting is between grinding feed bin and ejection of compact subassembly, and the material in the grinding feed bin can get into ejection of compact subassembly through ejection of compact filter screen. The utility model discloses a ball mill can realize the ejection of compact at the grinding process, and ejection of compact process need not set up the drive structure, and is with low costs, efficient.

Description

Ball mill

Technical Field

The utility model relates to a comminuted technical field especially relates to a ball mill.

Background

The ball mill is one of high-fine grinding machines widely used in industrial production. Among the prior art, the ball mill usually includes grinding storehouse, actuating mechanism and rinding body, and wherein, the cylindrical cavity that the grinding storehouse was the axis level setting, and the rinding body includes a plurality of balls, and a plurality of balls set up in grinding the storehouse, and actuating mechanism is used for the drive to grind the storehouse and rotates around its axis, and this in-process, the rinding body constantly is thrown in grinding the storehouse under the effect of centrifugal force to will grind the material in the cabin and smash levigating.

The ball mill in the prior art has the following disadvantages: (1) the discharging can be realized only by stopping the operation of the ball mill when the grinding and the discharging can not be realized, and the working efficiency is low; (2) a corresponding driving structure is required to be arranged in the discharging process, so that the whole ball mill is complex in structure and high in cost; (3) the grinding body and the material need to be separated in the discharging process, the process is complex, and the efficiency is low.

Therefore, it is highly desirable to invent a ball mill to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a ball mill can realize the ejection of compact at the grinding process, and ejection of compact process need not set up the drive structure, and is with low costs, efficient.

To achieve the purpose, the utility model adopts the following technical proposal:

a ball mill, comprising:

the inner cavity of the grinding bin is a conical chamber with a horizontal axis, and a plurality of grinding balls are arranged in the grinding bin;

a feed assembly connected to the small-bore end of the abrasive bin, the feed assembly configured to feed the abrasive bin;

a drive assembly configured to drive the grinding bin to rotate along an axis of the inner cavity;

ejection of compact subassembly and ejection of compact filter screen, ejection of compact subassembly connect in grind the big bore end of feed bin, ejection of compact filter screen sets up grind the feed bin with between the ejection of compact subassembly, the material in the feed bin of grinding can pass through ejection of compact filter screen gets into ejection of compact subassembly.

Optionally, an included angle between the inner wall of the grinding bin and the vertical direction is α, wherein α is greater than or equal to 60 ° and less than or equal to 80 °.

Optionally, N vertically arranged middle filter screens are further arranged in the grinding bin, and the grinding bin is divided into N +1 sub-bins by the N middle filter screens, wherein N is a positive integer;

along the direction that the feeding subassembly points to ejection of compact subassembly, N the diameter of the mesh of middle filter screen reduces gradually, N +1 the size of the ball in the branch storehouse reduces gradually.

Optionally, along the direction that the feeding assembly points to the discharging assembly, the included angle between the inner wall of the N +1 sub-bins and the horizontal direction gradually increases.

Optionally, the ejection of compact subassembly includes ejection of compact storehouse, ejection of compact storehouse connect in the one end of the heavy-calibre of grinding material storehouse and with the coaxial setting in grinding material storehouse, the entry size of ejection of compact storehouse is not less than the biggest bore of grinding material storehouse.

Optionally, the discharging assembly further comprises a collecting bin, the collecting bin is covered outside the discharging bin, and the discharging bin is in running fit with the collecting bin;

be provided with the discharging pipe on the lateral wall of play feed bin, the discharging pipe is used for the intercommunication go out the feed bin with collect the storehouse.

Optionally, an outlet of the discharge pipe is provided with a screen;

the discharging pipe is a plurality of, and is a plurality of the discharging pipe is followed the circumference equipartition setting of play feed bin.

Optionally, the feed assembly comprises:

the storage bin is fixedly connected to the small-caliber end of the grinding bin;

the feeding pipe is fixedly arranged in the storage bin, and two ends of the feeding pipe are respectively communicated with the storage bin and the grinding bin;

a helical band arranged in the feeding pipe, wherein the axis of the helical band is collinear with the rotation axis of the grinding bin,

the feeding assembly and the grinding material bin synchronously rotate, and the feeding pipe and the spiral belt can convey materials in the storage bin to the grinding material bin.

Optionally, a feeding filter screen is arranged between the feeding pipe and the grinding bin, and the diameter of the meshes of the feeding filter screen is larger than that of the meshes of the discharging filter screen.

Optionally, the storage bin is provided with a feeding port, the feeding port is arranged at one end of the storage bin close to the grinding bin, and a communication port between the feeding pipe and the storage bin is arranged at one end far away from the grinding bin;

the feeding assembly further comprises a conical guide table, the conical guide table is sleeved on the feeding pipe, and the inclined direction of the conical surface of the conical guide table is consistent with the inclined direction of the inner cavity of the grinding bin.

The utility model discloses beneficial effect does:

the utility model discloses a ball mill, the feeding subassembly is connected in the small-bore end of the grinding feed bin of toper inner chamber, ejection of compact subassembly is connected in the large-bore end of grinding feed bin, after the material of waiting to grind gets into the grinding feed bin from the feeding subassembly, the rotatory process of drive assembly drive grinding feed bin, the material is ground to the granularity size by the ball mill in the grinding feed bin and reachs predetermined dimensional range, because the inner chamber of grinding feed bin is the toper cavity, so the material can receive horizontally axial force under the effect of the bulkhead holding power in grinding feed bin and self gravity, and the big mouth end of the directional grinding feed bin of this axial force, thereby can move to ejection of compact subassembly, finally get into in the ejection of compact subassembly through ejection of compact filter screen. The ball mill of the utility model can realize discharging in the process of the operation of the grinding material, and has high working efficiency; an additional driving structure is not needed in the discharging process, the structure is simple, and the cost is low; the ejection of compact filter screen can intercept the grinding ball in the grinding feed bin and get into ejection of compact subassembly, need not carry out the separation operation of material and grinding ball alone again, and the process is simple, efficient.

Drawings

FIG. 1 is a schematic view of an internal structure of a ball mill according to an embodiment of the present invention;

fig. 2 is a sectional view a-a in fig. 1.

In the figure:

1-grinding a material bin; 11-intermediate strainer; 12-a first-level storage bin; 13-a secondary storage bin;

2-grinding balls;

3-a feeding assembly; 31-a storage bin; 311-a feeding port; 32-a feed pipe; 33-helical band; 34-a feed screen; 35-a conical guide table;

4-discharging a filter screen;

5-a discharging component; 51-a discharge bin; 511-side wall; 52-a collection bin; 521-a discharge hole; 522-V-shaped flow guide part; 53-a discharge pipe; 54-screen mesh;

61-a first support shaft; 62-second support shaft.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The embodiment provides a ball mill, it can be used to comminuted technical field. Fig. 1 is a cross-sectional view of the ball mill provided in this embodiment, and as shown in fig. 1, the ball mill includes a milling bin 1, a feeding assembly 3, a discharging screen 4, a discharging assembly 5, and a driving assembly. The grinding material feeding device comprises a grinding material bin 1, a feeding assembly 3, a grinding material feeding device and a grinding material discharging device, wherein an inner cavity of the grinding material bin 1 is a conical cavity with a horizontal axis, a plurality of grinding balls 2 are arranged in the grinding material bin 1, the feeding assembly 3 is connected to a small-caliber end of the grinding material bin 1, and the feeding assembly 3 is used for feeding materials to the; the drive assembly is used for driving the grinding bin 1 to rotate along the axis of the inner cavity of the grinding bin, the discharging assembly 5 is connected to the large-diameter end of the grinding bin 1, the discharging filter screen 4 is arranged between the grinding bin 1 and the discharging assembly 5, and materials in the grinding bin 1 can enter the discharging assembly 5 through the discharging filter screen 4.

In this embodiment, after the material that waits to grind gets into grinding feed bin 1 from feeding subassembly 3 in, the rotatory process of drive assembly drive grinding feed bin 1, the material is ground to the granularity by grinding ball 2 in the grinding feed bin 1 and reaches predetermined size range, because the inner chamber of grinding feed bin 1 is the toper cavity, so the material can receive horizontally axial force under the effect of the bulkhead holding power in grinding feed bin 1 and self gravity, and the directional big aperture end (directional ejection of compact subassembly promptly) in grinding feed bin 1 of this axial force, thereby the material can move towards ejection of compact subassembly 5 directions, finally in ejection of compact subassembly 5 is got into through ejection of compact filter screen 4. The ball mill of the embodiment can realize discharging in the process of operating the grinding materials, and has high working efficiency; an additional driving structure is not needed in the discharging process, the structure is simple, and the cost is low; ejection of compact filter screen 4 can intercept grinding ball 2 in the grinding feed bin 1 and get into ejection of compact subassembly 5, so the ejection of compact process need not carry on the material again with grinding ball 2's separation operation, the process is simple, efficient.

Specifically, the diameter of the mesh of the discharging filter screen 4 is larger than the maximum value of the preset material grinding particle size range, so that the material can smoothly enter the discharging bin 51 from the grinding bin 1 after reaching the proper size. Of course, the diameter of the mesh of the discharging filter screen 4 is smaller than the size of the grinding balls 2 in the grinding bin 1, so that the grinding balls 2 are ensured not to enter the discharging component 5.

Preferably, as shown in fig. 1, an included angle between the inner wall of the grinding bin 1 and the vertical direction is α, wherein α is greater than or equal to 60 degrees and less than or equal to 80 degrees, and within the range of the included angle, a large amount of grinding balls 2 in the grinding bin 1 cannot be gathered to one end with a large caliber of the grinding bin 1, so that the grinding balls 2 in the grinding bin 1 can grind materials more uniformly; and can guarantee that the material in the grinding material storehouse 1 can obtain enough big horizontal drive power to make the material smoothly get into in the ejection of compact subassembly 5 from the grinding material storehouse 1.

When the material grinds in abrasive material storehouse 1, the difficult in time ejection of compact after the particle size of part material reaches preset scope appears very likely, and is further ground into littleer granule, and some material is not ground in time in addition, leads to the size to reach preset scope, finally leads to the particle size distribution of material inhomogeneous. In order to solve the problem, as shown in fig. 1, N vertically arranged middle filter screens 11 are further arranged in the grinding material bin 1, the grinding material bin 1 is divided into N +1 sub-bins by the N middle filter screens 11, wherein N is a positive integer; along the direction that the feeding assembly 3 points to the discharging assembly 5, the diameters of the meshes of the N middle filter screens 11 are gradually reduced, and the sizes of the grinding balls 2 in the N +1 sub-bins are gradually reduced. Through the control to middle filter screen 11 net surfing hole diameter for the material just can get into next minute storehouse from this minute storehouse and carry out more careful grinding after reaching certain standard, and the material that does not reach this standard continues to grind in this minute storehouse, guarantees that the material that finally gets into in ejection of compact subassembly 5 can satisfy and predetermine the granularity requirement and more be even. It should be noted that the aperture of the mesh of the discharging screen 4 is smaller than that of any one of the intermediate screens 11.

In this embodiment, as shown in fig. 1, an intermediate filter 11 is disposed in the grinding bin 1, and the grinding bin 1 is divided into a first-stage bin 12 and a second-stage bin 13 by the intermediate filter 11. Wherein, the first-level bin 12 is close to the feeding component, the diameter of the grinding ball 2 in the first-level bin is R, and R is more than or equal to 20mm and less than or equal to 50 mm; the secondary bin 13 is close to the discharging component 5, the diameter of the grinding ball 2 in the secondary bin is r, wherein r is more than or equal to 5mm and less than or equal to 15mm, and the material is ground to a proper particle size in the primary bin 12 and then enters the secondary bin 13 to be continuously ground to a finer particle size.

Along with the diminishing of material granularity, the mobility of material worsens, in order to guarantee that the material can move smoothly to next branch storehouse, along the direction of 3 directional ejection of compact subassemblies 5 of feeding subassembly, the contained angle between the inner wall in N +1 branch storehouse and horizontal direction increases gradually. At this moment, the inner cavity of the whole grinding bin 1 forms a step-shaped conical cavity, and in the process that the granularity of the materials is reduced and the fluidity is poor, the included angle between the inner wall of the sub-bin and the horizontal direction is increased, so that the materials can obtain larger axial component force, and the materials can smoothly enter the next sub-bin or the discharging assembly 5.

For further guaranteeing that the material in the grinding material bin 1 can smoothly enter the discharging component 5, as shown in fig. 1, the discharging component 5 comprises a discharging bin 51, the discharging bin 51 is connected to one end of the large caliber of the grinding material bin 1 and coaxially arranged with the grinding material bin 1, and the size of the inlet of the discharging bin 51 is not smaller than the maximum caliber of the grinding material bin 1, so that the material can not be blocked after passing through the discharging filter screen 4 and directly falls into the discharging bin 51. Particularly, in this embodiment, go out feed bin 51 fixed connection in grinding feed bin 1, go out feed bin 51 promptly and can rotate along with grinding feed bin 1 together, both do not take place relative motion, so can guarantee better leakproofness for raise dust in the grinding feed bin 1 is difficult to run out. Alternatively, the discharging bin 51 and the grinding material bin 1 can be connected by welding.

As shown in fig. 1, the discharging assembly 5 further includes a collecting bin 52, the collecting bin 52 is covered outside the discharging bin 51, the discharging bin 51 is rotatably matched with the collecting bin 52, a discharging pipe 53 is arranged on a side wall 511 of the discharging bin 51, and the discharging pipe 53 is used for communicating the discharging bin 51 and the collecting bin 52. The material firstly enters the discharging bin 51 after passing through the discharging filter screen 4, and then enters the fixed collecting bin 52 from the discharging pipe 53 on the discharging bin 51. The discharging pipe 53 can play a role in guiding the material, so that the raised dust generated after the material enters the collecting bin 52 is less, and the gap between the collecting bin 52 and the discharging bin 51 can be reduced.

Preferably, the bottom of the collecting bin 52 is provided with a discharge hole 521, and an external material receiving structure is placed below the discharge hole 521, so that the material can be continuously received. Further, the bottom of the collecting bin 52 is provided with a V-shaped flow guide portion 522, the discharge port is arranged at the tip end of the V-shaped flow guide portion 522, and the V-shaped flow guide portion 522 can ensure that the material in the collecting bin 52 can smoothly flow out from the discharge port 521, and is not easy to generate residual deposition in the collecting bin.

In this embodiment, discharging pipe 53 is a plurality of, and a plurality of discharging pipes 53 equipartition are on the global of play feed bin 51, so in the rotation process of play feed bin 51, in the material in the play feed bin 51 can uninterruptedly gets into collection storehouse 52, guarantees the continuity of the ejection of compact. Furthermore, the cross section of the side wall 511 of the discharging bin 51 is in a V shape, the discharging pipe 53 is arranged at the tip part of the V shape, and under the flow guiding effect of the V-shaped side wall 511, the material in the discharging bin 51 can smoothly flow into the discharging pipe 53, so that the problem of residual deposition of the material in the discharging bin 51 is avoided.

Preferably, as shown in fig. 1, the outlet of the discharging pipe 53 is provided with a screen 54, and the ground material has fine particles and poor fluidity, so that the agglomerated material is easily agglomerated during the transportation process, and the screen 54 provided at the discharging pipe 53 can break the agglomerated material.

In this embodiment, in order to support the grinding material bin 1, the ball mill further includes a first support rotating shaft 61 and a second support rotating shaft 62, wherein the feeding assembly 3 is fixedly connected with the grinding material bin 1, and the first support rotating shaft 61 is fixedly connected with the feeding assembly 3; the second supporting rotating shaft 62 is fixedly connected with the discharging bin 51, and the collecting bin 52 is in rotating fit with the second supporting rotating shaft 62; the output end of the drive assembly is rotationally connected with the first support rotating shaft 61 and/or the second support to drive the grinding silo 1 to rotate around the axis thereof.

In order to realize the feeding of the feeding assembly 3 into the grinding material bin 1, as shown in fig. 1-2, the feeding assembly 3 includes a storage bin 31, a feeding pipe 32 and a spiral belt 33, wherein the storage bin 31 is fixedly connected to a small-diameter end of the grinding material bin 1, the feeding pipe 32 is fixedly disposed in the storage bin 31, two ends of the feeding pipe 32 are respectively communicated with the storage bin 31 and the grinding material bin 1, the spiral belt 33 is disposed in the feeding pipe 32, an axis of the spiral belt 33 is collinear with a rotation axis of the grinding material bin 1, the feeding assembly 3 and the grinding material bin 1 rotate synchronously, and the feeding pipe 32 and the spiral belt 33 can convey materials in the storage bin 31 into the grinding material bin 1.

When using the ball mill, drive assembly drive grinding silo 1 and feeding subassembly 3 rotate together, and in this process, the material in the storage silo 31 is raised, and the material part that raises falls into inlet pipe 32, rotates the in-process continuously, and helical ribbon 33 will fall into the material of inlet pipe 32 and carry to grinding silo 1 in, makes whole feeding process needn't set up extra driving source, simple structure, with low costs.

Preferably, a feeding screen 34 is arranged between the feeding pipe 32 and the grinding material bin 1, and the diameter of the mesh opening on the feeding screen 34 is larger than that of the mesh opening of the discharging screen 4. The feeding filter screen 34 can enable the materials in the grinding material bin 1 to pass through smoothly, and can prevent the grinding balls 2 in the grinding material bin 1 from moving into the feeding assembly 3. In this embodiment, the diameters of the holes in the feed screen 34, the intermediate screen 11, and the discharge screen 4 are gradually reduced.

As shown in fig. 1 and fig. 2, the storage bin 31 is provided with a feeding port 311, the feeding port 311 is disposed at one end of the storage bin 31 close to the grinding bin 1, the feeding pipe 32 is disposed at one end of the storage bin 31 far away from the grinding bin 1, the feeding assembly 3 further includes a conical guide table 35, the feeding pipe 32 is sleeved with the conical guide table 35, and the inclined direction of the conical surface of the conical guide table 35 is consistent with the inclined direction of the inner cavity of the grinding bin 1. Therefore, after the material enters the storage bin 31 from the feeding port 311, the material can smoothly slide to the communication port between the feeding pipe 32 and the storage bin 31 under the guiding action of the tapered guide table 35, so that the material falling on the feeding pipe 32 is not easy to deposit and retain. Further, the position of the feeding pipe 32 is provided with a butterfly valve, which can prevent the material in the storage bin 31 from flowing out of the storage bin 31 from the feeding port 311 and can also prevent the flying dust in the storage bin 31 from flying out of the storage bin 31.

Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and for those skilled in the art, there are variations on the specific embodiments and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A ball mill, comprising:

the grinding bin (1) is provided with an inner cavity which is a conical chamber with a horizontal axis, and a plurality of grinding balls (2) are arranged in the grinding bin (1);

a feeding assembly (3) connected to the small-bore end of the grinding silo (1), the feeding assembly (3) being configured to feed the grinding silo (1);

a drive assembly configured to drive the grinding silo (1) in rotation along the axis of the inner cavity;

ejection of compact subassembly (5) and ejection of compact filter screen (4), ejection of compact subassembly (5) connect in grind the big bore end of feed bin (1), ejection of compact filter screen (4) set up grind feed bin (1) with between ejection of compact subassembly (5), the material in grinding feed bin (1) can pass through ejection of compact filter screen (4) get into ejection of compact subassembly (5).

2. The ball mill according to claim 1, characterized in that the angle between the inner wall of the milling silo (1) and the vertical is α, wherein α is 60 ° or more and 80 ° or less.

3. The ball mill according to claim 1, characterized in that N vertically arranged intermediate screens (11) are further arranged in the milling silo (1), the N intermediate screens (11) divide the milling silo (1) into N +1 sub-silos, wherein N is a positive integer;

along the direction that feeding component (3) point to ejection of compact subassembly (5), the diameter of the mesh of N middle filter screen (11) reduces gradually, and the size of N +1 ball (2) in the branch storehouse reduces gradually.

4. The ball mill according to claim 3, characterized in that the angle of the inner wall of the N +1 sub-compartments with the horizontal increases gradually in the direction of the feed assembly (3) towards the discharge assembly (5).

5. The ball mill according to any of the claims 1 to 4, characterized in that the discharge assembly (5) comprises a discharge bin (51), the discharge bin (51) is connected to the large-diameter end of the milling silo (1) and is arranged coaxially with the milling silo (1), and the inlet size of the discharge bin (51) is not smaller than the maximum diameter of the milling silo (1).

6. The ball mill according to claim 5, characterized in that the outfeed assembly (5) further comprises a collecting bin (52), the collecting bin (52) being housed outside the outfeed bin (51), the outfeed bin (51) being in rotational engagement with the collecting bin (52);

be provided with discharging pipe (53) on the lateral wall of feed bin (51), discharging pipe (53) are used for the intercommunication feed bin (51) with collect storehouse (52).

7. The ball mill according to claim 6, characterized in that the outlet of the tapping pipe (53) is provided with a screen (54);

the discharging pipes (53) are multiple, and the discharging pipes (53) are uniformly distributed along the circumferential direction of the discharging bin (51).

8. The ball mill according to any one of claims 1 to 4, characterized in that the feed assembly (3) comprises:

the storage bin (31) is fixedly connected to the small-caliber end of the grinding bin (1);

the feeding pipe (32) is fixedly arranged in the storage bin (31), and two ends of the feeding pipe (32) are respectively communicated with the storage bin (31) and the grinding bin (1);

a helical band (33) disposed within the feed tube (32), the axis of the helical band (33) being collinear with the axis of rotation of the grinding silo (1),

the feeding assembly (3) and the grinding bin (1) synchronously rotate, and the feeding pipe (32) and the spiral belt (33) can convey materials in the storage bin (31) into the grinding bin (1).

9. The ball mill according to claim 8, characterized in that a feed screen (34) is arranged between the feed pipe (32) and the milling silo (1), the diameter of the mesh of the feed screen (34) being larger than the diameter of the mesh of the discharge screen (4).

10. The ball mill according to claim 8, characterized in that the storage bin (31) is provided with a feed inlet (311), the feed inlet (311) is arranged at one end of the storage bin (31) close to the grinding bin (1), and the communication port of the feed pipe (32) and the storage bin (31) is arranged at one end far from the grinding bin (1);

the feeding assembly (3) further comprises a conical guide table (35), the feeding pipe (32) is sleeved with the conical guide table (35), and the inclined direction of the conical surface of the conical guide table (35) is consistent with the inclined direction of the inner cavity of the grinding bin (1).

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