CN115870057A

CN115870057A - Centrifugal grinding mechanism and grinding device

Info

Publication number: CN115870057A
Application number: CN202310002444.8A
Authority: CN
Inventors: 陈向波; 盘鑫; 闫翔
Original assignee: Guilin Guiguang Talc Development Co ltd
Current assignee: Guilin Guiguang Talc Development Co ltd
Priority date: 2023-01-03
Filing date: 2023-01-03
Publication date: 2023-03-31

Abstract

The invention discloses a centrifugal grinding mechanism and a grinding device, wherein a grinding cavity is formed on the inner side of a grinding sleeve, a plurality of grinding grooves are formed in the inner wall of the grinding sleeve at intervals along the vertical direction, the centrifugal grinding mechanism further comprises a plurality of grinding rollers and a plurality of central columns vertically arranged in the grinding cavity, the grinding rollers are sleeved on the central columns in an interference fit mode through holes, and therefore the gaps between the grinding rollers and the grinding grooves can be adjusted through the movement of the central columns in the vertical direction.

Description

Centrifugal grinding mechanism and grinding device

Technical Field

The present invention relates to a centrifugal grinding technique, and more particularly, to a centrifugal grinding mechanism and a grinding apparatus.

Background

The grinding is a common processing method for manufacturing powder paint or powder, the centrifugal grinding is to grind objects by adopting a planetary transmission mode and utilizing the principle of centrifugal motion, the grinding efficiency is high, and the grinding barrel simultaneously performs rotation and revolution motion, so that the friction efficiency of grinding stones and materials is greatly improved.

For example, the Chinese patent application No. CN202011269686.6, which has the publication date that, the invention discloses a high-efficiency grinding device for producing powder coating, which comprises a base, a primary grinding mechanism, a powder selecting mechanism, an ultra-fine grinding mechanism and a driving mechanism, wherein the primary grinding mechanism, the powder selecting mechanism, the ultra-fine grinding mechanism and the driving mechanism are arranged at the upper end of the base from top to bottom; preliminary crocus mechanism includes elementary grinding chamber, rotates the pivot that sets up in elementary grinding intracavity and sets up in the epaxial grinding roller that grinds, elementary grinding chamber's lateral wall fixed mounting have with grind roller complex grinding roll ring, mutually support through preliminary crocus mechanism and superfine grinding mechanism make the more careful that the powder can be ground, also can control the feeding when having increased selection powder mechanism and can having carried out the screening to thicker raw materials between preliminary crocus mechanism and the superfine grinding mechanism, can not produce accumulational condition, realized the function of even feeding, and three mechanism is driven by same actuating mechanism, and economic nature is higher.

Above-mentioned scheme is when carrying out centrifugal grinding, grinds roller and grinds intracavity wall and laminates all the time, and the mode of grinding is single, and can't dodge when meetting the lapping thing that contains harder impurity and lead to grinding roller wearing and tearing big.

Disclosure of Invention

The invention aims to provide a centrifugal grinding mechanism and a grinding device, which are used for solving the defects in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme:

a centrifugal grinding mechanism comprises a grinding sleeve, a grinding cavity is formed on the inner side of the grinding sleeve, a plurality of grinding grooves are formed on the inner wall of the grinding sleeve at intervals along the vertical direction, and the centrifugal grinding mechanism is characterized in that,

the grinding roller is sleeved on the central column in an interference fit mode through the through hole, the outer wall surface of the central column at least has two positions with different radial sizes in the axial direction, and therefore the gap between each grinding roller and the grinding groove is adjustable through the movement of the central column in the vertical direction.

In the centrifugal grinding mechanism, the central column comprises a parallelogram body moving in the vertical direction, the parallelogram body is an oblique cylinder with a parallelogram axial cross section, a cavity is formed in the central column, the parallelogram body is arranged in the cavity, the central column is further provided with a plurality of pairs of adjusting blocks, the adjusting blocks are symmetrically distributed on the surface of the central column at intervals, each pair of adjusting blocks are respectively attached to two different inclined planes of the parallelogram body, the adjusting blocks slidably penetrate the surface of the central column, and an elastic part is connected between the adjusting blocks and the inner surface of the central column 4.

The centrifugal grinding mechanism further comprises a plurality of limiting discs, the limiting discs are arranged between two adjacent grinding grooves in the grinding cavity at intervals, through holes are formed in the surfaces of the limiting discs at intervals, the central column vertically penetrates through the through holes in the surfaces of the limiting discs, and the radial size of each through hole is larger than that of the central column.

In the centrifugal grinding mechanism, a material guide disc is fixed at one end of the central column, which is far away from the rotating disc, and the material guide disc is used for guiding the raw materials entering the grinding sleeve into a gap between the grinding sleeve and the grinding roller.

The utility model provides a grinding device, be provided with foretell centrifugal grinding mechanism in the box, the box upper end is provided with the inlet pipe, the inlet pipe stretches into grind the intracavity.

In the above grinding device, the bulk material tray is arranged in the box body, the central column is arranged on the surface of the bulk material tray, and the bulk material tray is driven by the driving device to rotate so as to drive the central column to rotate.

Foretell grinder, the box inner wall is equipped with keeps off the material ring, it sets up to keep off the material ring the bulk cargo dish below, keep off the material ring with leave the clearance between the bulk cargo dish, keep off the material ring and be used for preventing that the material from dropping from the bulk cargo dish surface.

In the grinding device, the side cavity is reserved between the outer surface of the grinding sleeve and the inner wall of the grinding box, unqualified powder ground by the centrifugal grinding mechanism is blown upwards through the gap to enter the grinding cavity again for grinding, and qualified powder is sucked out from the top of the grinding box.

In the grinding device, the surface of the box body is provided with the air inlet, and the air inlet is arranged below the grinding cavity and communicated with the side cavity.

In the grinding device, the discharge pipe is arranged at the upper end of the box body, one end of the discharge pipe extends into the box body, the discharge pipe is connected with the high-pressure fan, and one end of the discharge pipe extending into the box body is connected with the powder concentrator.

The invention has the beneficial effects that: through changing between center post and the grinding roller contact position change the motion state and the motion range of grinding the roller, when grinding the material that contains hard impurity, because grinding the roller through hole interference fit cup joint on the center post moreover for grinding the relative activity position that has had between roller and the center post, make grinding the roller and can kick-back in the opposite direction when striking hard thing in order to reduce the wearing and tearing that the striking brought.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a schematic view of an overall structure of a polishing apparatus according to an embodiment of the present invention;

fig. 2 is a first perspective structural view illustrating an internal structure of a polishing apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic bottom view of a second perspective structure of the internal structure of the polishing apparatus according to the embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a central column according to another embodiment of the present invention;

FIG. 5 is a schematic view of a central column according to another embodiment of the present invention;

FIG. 6 is a schematic view of a first view structure of a parallelogram block according to another embodiment of the present invention;

FIG. 7 is a schematic diagram of a second view structure of a parallelogram block according to another embodiment of the present invention;

FIG. 8 is a schematic view of a first state of an abrasive roll according to another embodiment of the present invention;

FIG. 9 is a structural diagram of a second state of an abrasive roll according to another embodiment of the present invention;

FIG. 10 is a schematic view of an arc-shaped protrusion according to another embodiment of the present invention;

fig. 11 is a schematic view of an operating state of an arc-shaped protrusion according to another embodiment of the present invention.

Description of reference numerals:

1. grinding the sleeve; 3. a grinding roller; 4. a central column; 41. a material guide plate; 8. a limiting disc; 91. a parallelogram body; 92. an adjusting block; 93. an arc-shaped convex part; 10. a box body; 12. a bulk material tray; 13. a material blocking ring; 14. a side cavity; 15. a discharge pipe; 17. selecting a powder machine; 18. and an air inlet.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 11, the centrifugal grinding mechanism provided in the embodiment of the present invention includes a grinding sleeve 1, a grinding cavity is formed inside the grinding sleeve 1, a plurality of grinding grooves are formed on an inner wall of the grinding sleeve 1 at intervals along a vertical direction, the centrifugal grinding mechanism further includes a plurality of grinding rollers 3 and a plurality of central columns 4 vertically arranged in the grinding cavity, the grinding rollers 3 are sleeved on the central columns 4 in an interference fit manner through holes, an outer wall surface of the central columns 4 at least has two positions with different radial dimensions in an axial direction, and thus, a gap between each grinding roller 3 and the grinding groove is adjustable through movement of the central columns 4 in the vertical direction.

Specifically, in this embodiment, a power unit such as a motor drives a main shaft to rotate, the main shaft drives a turntable to rotate, the central column 4 is movably mounted on the turntable and driven by a driving member such as an electric push rod to move up and down, the electric push rod is fixed on the turntable and is coaxially and fixedly connected with the central column 4 to realize pushing, and the turntable drives each central column 4 to perform circular orbit motion when rotating.

The grinding sleeve 1 is a cylindrical structure, the inner space of the grinding sleeve is a grinding cavity, a plurality of annular grinding grooves are sequentially formed on the inner wall of the grinding sleeve from top to bottom, such as four or five or more grinding grooves, through which the grinding rolls 3 are fitted over the central column 4 and which have a radial dimension greater than that of the central column 4, so that the grinding rolls 3 have a play of shaking on the central column 4, which can move horizontally within a certain range, makes the position of the grinding roller 3 relative to the central column 4 unique by means of centrifugal force when grinding, and at the same time, in this embodiment, the outer wall surface of the central column 4 has at least two positions with different radial dimensions in the axial direction, that is, the central column 4 has at least two positions with different thicknesses, the central column 4 can be a non-cylindrical body to achieve the effect, in this way, by means of the vertical movement of the central column 4, by means of different radial positions to abut against the grinding rollers 3, the gap between the grinding roller 3 and the grinding groove can be adjusted, for example, the central column 4 is a frustum structure, so that the frustum structure can be moved upwards or downwards, i.e. the thicker or thinner part can be made to fit the grinding roll 3, thereby adjusting the gap between the grinding roll 3 and the grinding groove, the clearance refers to the minimum distance between the grinding roller 3 and the grinding groove in the case of centrifugal grinding movement, and the vertical movement of the central column 4 essentially changes the moving clearance of the through holes on the grinding roller 3 on the central column 4 in the horizontal direction, when the grinding rolls 3 have no play in the radial direction in the central column 4, the grinding rolls 3 are subjected to roll grinding against the grinding grooves, when the grinding rollers 3 have a clearance in the radial direction of the central pillar 4, the grinding rollers 3 may rebound when encountering hard objects.

In this embodiment, when the central pillar 4 is a frustum structure, the through holes of the grinding rollers 3 have two situations, one is that the size of the through holes of the grinding rollers 3 is consistent, and at this time, the large radial end of the frustum structure is on the top, and the small radial end is on the bottom, so another technical effect is brought, that is, from top to bottom, the gap between the grinding rollers 3 and the grinding groove gradually becomes smaller from top to bottom, so as to improve the grinding effect, and the other is that the size of the through holes of the grinding rollers 3 is inconsistent, and the variation trend is consistent with the variation trend of the central pillar 4, for example, the central pillar gradually becomes thicker from top to bottom, and the through holes of the grinding rollers 3 become larger from top to bottom, so that the gap between the grinding rollers 3 and the grinding groove can be consistent, and still consistent with the grinding gap in the prior art.

The embodiment of the invention has the beneficial effects that: change the motion state and the motion range of grinding roller 3 through changing contact position between center post and the grinding roller 3, when grinding the material that contains hard impurity, because grinding roller 3 cup joints on center post 4 through-hole interference fit moreover for grinding roller 3 and center post 4 between have had relative movable position, make grinding roller 3 can kick-back in the opposite direction when striking hard thing in order to reduce the wearing and tearing that the striking brought.

In another embodiment provided by the present invention, a parallelogram 91 capable of moving in the vertical direction is disposed in the central pillar 4, the parallelogram is an oblique cylinder with a parallelogram axial cross section, for example, the parallelogram comprises six faces, the top and bottom faces of the parallelogram are identical but staggered by a certain extent in the horizontal direction, all four side faces are inclined faces, so that the parallelogram axial cross section is formed, a cavity is disposed in the central pillar 4, the parallelogram 91 is disposed in the cavity, a plurality of pairs of adjusting blocks 92 are further disposed on the central pillar 4, each pair of adjusting blocks 92 comprises two adjusting blocks 92, the plurality of pairs of adjusting blocks 92 are vertically distributed on the parallelogram 91 at intervals, the two adjusting blocks 92 of each pair are symmetrically distributed on two opposite side faces of the central pillar 4, the two adjusting blocks 92 in each pair are respectively attached to two different inclined planes of the parallel quadrangular bodies 91, the adjusting blocks 92 slidably penetrate through sliding holes in the surface of the central column 4, an elastic part (not shown in the figure) is connected between the adjusting blocks 92 and the inner surface of the central column 4, so that the central column 4 is of a composite dynamic structure, the outer part of the central column 4 is of a cylindrical structure, the vertical movement of the cylindrical structure refers to the vertical movement of the internal partial structure (the parallel quadrangular bodies 91), the parallel quadrangular bodies 91 can vertically move relative to the central column 4, a plurality of pairs of sliding holes are sequentially and symmetrically arranged on the central column 4 from top to bottom, each pair of sliding holes are arranged at the same height, the adjusting blocks 92 correspondingly slidably penetrate through the sliding holes in the central column 4, and the adjusting blocks 92 are arranged in the through holes in the grinding roller 3, the adjusting blocks 92 can change the size of the gap between the through hole of the pipe and the center column 4 in the radial direction in the moving process, the parallel quadrangular bodies 91 are vertical in the cavity of the center column 4, two inclined planes on the parallel quadrangular bodies 91 are respectively attached to one end of each pair of adjusting blocks 92 close to the parallel quadrangular bodies 91, one end of each adjusting block 92 far away from the parallel quadrangular bodies 91 is positioned on the same plane in the vertical direction, so that the telescopic length of each adjusting block 92 is always kept consistent in the telescopic process, an elastic part is connected between one end of each adjusting block 92 positioned in the cavity and the inner surface of the center column 4, the adjusting blocks 92 are attached to the surface of the parallel quadrangular bodies 91 under the action of the elastic part, one end of the elastic part is fixed on the surface of the adjusting block 92, and the other end of the elastic part is fixed on the inner wall of the center column 4, the stability of the adjusting block 92 is improved, the grinding roller 3 is prevented from shaking during surface movement, so that position change is also reset, when the adjusting block 92 is pushed outwards by the parallel four-sided body 91, the adjusting block 92 is always attached to the surface of the parallel four-sided body 91 under the action of the elastic piece, the adjusting block 92 is used for adjusting the radial size of the central column 4, so that the gap size between the central column 4 and the inner wall of the through hole of the grinding roller 3 is changed, and further the gap size between the grinding roller 3 and the grinding groove is adjusted, in the embodiment, the central column 4 is fixed on the turntable, and an electric push rod is arranged inside the central column 4, and the output end of the electric push rod is fixed at one end of the parallel four-sided body 91 to complete vertical movement of the parallel four-sided body 91.

Specifically, the centrifugal grinding mechanism provided in this embodiment has at least two working states, in the first state, the electric push rod pulls up the parallel four-sided body 91, the size of the contact portion between the parallel four-sided body 91 and the adjusting block 92 near one side of the grinding groove begins to increase, so as to push out the adjusting block 92 near one side of the grinding sleeve, so as to push the grinding roller 3 until the grinding roller 3 contacts the inner wall of the grinding groove (as shown in fig. 8), at this time, the grinding roller 3 can only roll against the grinding groove under the restriction of the grinding groove and the center post 4, a grinding space is formed between one end of the grinding roller 3 and the inner wall of the grinding groove, when the material enters the grinding cavity, the material is scattered onto the inner wall of the grinding groove under the effect of centrifugal force, when the material passes through the gap between the grinding roller 3 and the grinding groove, the material is crushed by the grinding roller 3, and then falls into the grinding groove of two layers to be ground by the same principle, in the second state, when the material containing hard impurities is grinded, the electric push rod pushes the parallel four-sided body 91 downwards, the size of the part of the parallel four-sided body 91 contacted with the adjusting block 92 far away from one side of the grinding groove begins to increase, so that the adjusting block 92 is pushed out outwards, the contact point of the grinding roller 3 and the central column 4 is the row of adjusting blocks 92 close to the central axis of the central column 4 on the outer wall of the central column 4 due to the centrifugal force generated by the rotation of the rotary table (as shown in fig. 9), the material in the grinding cavity is ground and crushed, because a gap is formed between the through hole of the grinding roller 3 and the central column 4, when the grinding roller 3 impacts the hard objects in the grinding groove, the grinding roller 3 can radially move and rebound in the horizontal direction to reduce the abrasion, and the gap size between the grinding roller 3 and the grinding groove can be adjusted by changing the length of the outward push-out of the adjusting block 92 in both working states, when the size of the gap between the adjusting block 92 and the inner wall of the through hole changes, for example, becomes smaller, the maximum radius of the grinding roller 3 becomes smaller during circumferential movement, so that the grinding gap between the grinding roller and the grinding groove becomes larger.

Preferably, in the adjusting blocks 92 of the centrifugal grinding mechanism provided in the above embodiment, each pair of two adjusting blocks 92 are located at the same height, when the parallel four-sided bodies 91 move upwards or downwards, the moving distances of the adjusting blocks 92 at different positions are the same, which makes the moving gap of the grinding roller 3 in the radial direction of the central column 4 from top to bottom the same, that is, although the gap between the grinding roller 3 and the grinding groove can be changed, the gap between each grinding roller 3 and the grinding groove in the vertical direction is always the same, since the material is ground from top to bottom, the grinding pressure applied to the upper grinding roller 3 is large, which causes the wear layer length of the grinding roller 3 to be inconsistent, and since the axial reaction force applied to the motor is large due to the large grinding pressure applied to the upper grinding roller 3, which also affects the service life of the motor, in another embodiment, further, the end of the adjusting block 92 far away from the parallel four-sided bodies 91 may be set to be sequentially smaller from top to bottom (as shown in fig. 7), which the surface lengths of the adjusting blocks 92 are different from top to bottom are different from top, which gradually decrease the wear the grinding gap between the grinding roller 3.

Further, when the centrifugal grinding mechanism provided in the above embodiment is operated in the first state (as shown in fig. 8), the grinding roller 3 generates a large lateral force on one side (e.g. left side) of the adjusting block 92, and the lateral force is completely received by the parallel four-sided body 91, which easily causes the parallel four-sided body 91 to deform, thereby reducing the service life, therefore, in another embodiment, a plurality of arc-shaped protrusions 93 (as shown in fig. 10) may be further added at intervals on the right side of the parallel four-sided body 91, when the parallel four-sided body 91 moves upward, the arc-shaped protrusions 93 gradually reach the position of the other side, e.g. right side adjusting block 92, so as to eject the other side adjusting block 92, at this time, the left and right adjusting blocks 92 are both fitted with the through hole of the grinding roller 3, as shown in fig. 11, when the parallel four-sided body 91 receives the lateral force from the left adjusting block 92, the right adjusting block 92 supports the parallel four-sided body 91 to remove the lateral force.

In another embodiment of the present invention, the polishing apparatus further comprises a plurality of limiting discs 8, the limiting discs 8 are disposed in the polishing cavity at intervals between two adjacent polishing grooves, through holes are disposed on the surfaces of the limiting discs 8 at intervals, the central column 4 is vertically inserted into the through holes on the surfaces of the limiting discs 8, the radial size of the through holes is larger than the radial size of the central column 4, the limiting discs 8 are disposed in the portion of the polishing cavity between two adjacent polishing grooves at intervals and rotate together with the turntable, the limiting discs 8 are fixed on the turntable through a central shaft, the limiting discs 8 are fixedly sleeved on the central shaft at intervals, and the radial size of the through holes is larger than the radial size of the central column 4, so that the central column 4 can move up and down in the through holes without collision, and thus the polishing roller 3 can be lapped on the limiting discs 8, which has an effect of limiting the polishing roller 3 at the polishing grooves so that the material in the polishing grooves can be always polished during the movement process.

In another embodiment of the present invention, a material guiding disc 41 is fixed on one end of the central column 4 away from the rotating disc, the material guiding disc 41 is arranged in the central area of the grinding chamber and covered right above the rotating disc, and the material guiding disc 41 is used for guiding the raw material entering the grinding sleeve 1 into the gap between the grinding sleeve 1 and the grinding roller 3.

The other embodiment of the invention also provides a grinding device, which comprises a box body 10, wherein the centrifugal grinding mechanism is arranged in the box body 10, a feeding pipe is arranged at the upper end of the box body 10, the feeding pipe extends into the grinding cavity, and a large material is crushed by a crusher and then conveyed into the feeding pipe by a spiral flood dragon before grinding.

In another embodiment of the present invention, a material scattering disk 12 is disposed inside the box 10, the central column 4 is disposed on the upper surface of the material scattering disk 12, the material scattering disk 12 is driven by the driving device to rotate to drive the central column 4 to rotate, and as mentioned above, the material scattering disk 12 is used as a rotating disk at the same time.

In another embodiment of the present invention, a material blocking ring 13 is disposed on an inner wall of the box 10, the material blocking ring 13 is disposed below the bulk material tray 12, a gap is left between the material blocking ring 13 and the bulk material tray 12, the material falls on the surface of the bulk material tray 12 after being ground and falls on the surface of the material blocking ring 13 under a centrifugal action, and then the air blown upward is blown upward from the gap between the grinding sleeve 1 and the box.

In still another embodiment of the present invention, an edge cavity 14 is left between the outer surface of the grinding sleeve 1 and the inner wall of the box 10, the powder ground by the centrifugal grinding mechanism falls on the surface of the baffle ring 13, and is blown upwards through the edge cavity 14, the unqualified powder is blown down into the grinding cavity again for grinding due to the large weight, and the qualified powder is sucked out from the top of the box 10 due to the small weight.

In another embodiment of the present invention, an air inlet 18 is formed in the surface of the box 10, the air inlet 18 is located below the material stopping ring 13, the air inlet 18 is located below the grinding cavity and is communicated with the side cavity, and the air flow entering from the air inlet 18 crosses the material stopping ring 13 to blow up the material.

In another embodiment provided by the present invention, a discharge pipe 15 is disposed at the upper end of the box body 10, one end of the discharge pipe 15 extends into the box body 10, a high pressure fan 16 is connected to the discharge pipe 15, a powder concentrator 17 is connected to one end of the discharge pipe 15 extending into the box body 10, negative pressure gas is generated inside the box body 10 under the action of the high pressure fan 16, the gas enters the box body 10 from the air inlet 18 and blows up the powder, the qualified powder is discharged from the box body 10 and falls into the grinding cavity for further grinding, and the powder concentrator 17 is provided with a filter mechanism, so that the qualified powder can be screened according to the size of the powder.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims

1. A centrifugal grinding mechanism comprises a grinding sleeve, a grinding cavity is formed on the inner side of the grinding sleeve, a plurality of grinding grooves are formed on the inner wall of the grinding sleeve at intervals along the vertical direction, and the centrifugal grinding mechanism is characterized in that,

2. The centrifugal grinding mechanism according to claim 1, wherein a parallelogram block capable of moving in a vertical direction is disposed in the central column, the parallelogram block is an oblique cylinder with a parallelogram cross section, a cavity is disposed in the central column, the parallelogram block is disposed in the cavity, a plurality of pairs of adjusting blocks are disposed on the central column, the adjusting blocks are symmetrically distributed on the surface of the central column at intervals, each pair of adjusting blocks are respectively attached to two different oblique planes of the parallelogram block, the adjusting blocks slidably penetrate the surface of the central column, and an elastic member is connected between the adjusting blocks and the inner surface of the central column.

3. The centrifugal grinding mechanism according to claim 1, further comprising a plurality of limiting discs, wherein the limiting discs are disposed in the grinding cavity at intervals and located between two adjacent grinding grooves, through holes are formed in the surfaces of the limiting discs at intervals, the central column vertically penetrates through the through holes in the surfaces of the limiting discs, and the radial dimension of the through holes is larger than that of the central column.

4. The centrifugal grinding mechanism as claimed in claim 1, wherein a material guiding disc is fixed to an end of the central column away from the rotating disc, and the material guiding disc is used for guiding the raw material entering the grinding sleeve into a gap between the grinding sleeve and the grinding roller.

5. A grinding device, comprising a box body, wherein the centrifugal grinding mechanism as claimed in any one of claims 1 to 4 is arranged in the box body, a feeding pipe is arranged at the upper end of the box body, and the feeding pipe extends into the grinding cavity.

6. The abrading apparatus of claim 5, wherein the housing includes a bulk head, the central post is disposed on a surface of the bulk head, and the bulk head is rotated by a drive device to rotate the central post.

7. The grinding device as claimed in claim 6, wherein the inner wall of the box body is provided with a material blocking ring, the material blocking ring is arranged below the material scattering disk, a gap is reserved between the material blocking ring and the material scattering disk, and the material blocking ring is used for preventing the material from falling off from the surface of the material scattering disk.

8. The grinding device of claim 5, wherein a side cavity is left between the outer surface of the grinding sleeve and the inner wall of the grinding box, unqualified powder ground by the centrifugal grinding mechanism is blown upwards through the gap to enter the grinding cavity again for grinding, and qualified powder is sucked out of the top of the grinding box.

9. The grinding device as claimed in claim 5, wherein the surface of the box body is provided with an air inlet, and the air inlet is arranged below the grinding cavity and communicated with the side cavity.

10. The grinding device according to claim 5, wherein a discharge pipe is arranged at the upper end of the box body, one end of the discharge pipe extends into the box body, a high-pressure fan is connected to the discharge pipe, and a powder concentrator is connected to one end of the discharge pipe extending into the box body.