CN115870057A - Centrifugal grinding mechanism and grinding device - Google Patents

Abstract

The invention discloses a centrifugal grinding mechanism and a grinding device. A grinding chamber is formed inside the grinding sleeve, and a plurality of grinding grooves are vertically spaced on the inner wall of the grinding sleeve, and a plurality of grinding rollers and a vertical A plurality of central columns arranged in the grinding chamber, the grinding rollers are sleeved on the central columns through the through holes with an interference fit, so that through the movement of the central columns in the vertical direction, each The gap between the grinding roller and the grinding tank is adjustable. The centrifugal grinding mechanism and grinding device provided by the present invention can change the motion state and range of motion of the grinding roller by changing the contact position between the central column and the grinding roller. When grinding materials containing hard impurities, and because the grinding roller is sleeved on the center column through the interference fit of the through hole, there is a relative movable position between the grinding roller and the center column, so that the grinding roller hits the hard object It can rebound in the opposite direction to reduce the wear and tear caused by the impact.

Description

Centrifugal grinding mechanism and grinding device

technical field

The invention relates to a centrifugal grinding technology, in particular to a centrifugal grinding mechanism and a grinding device.

Background technique

Grinding is a common processing method for making powder coatings or some powders. Centrifugal grinding adopts planetary transmission and uses the principle of centrifugal motion to grind objects. The grinding efficiency is high. The grinding barrel is rotating and revolving at the same time. Thus, the friction efficiency between the grinding stone and the material is greatly improved.

For example, the Chinese patent application number is CN202011269686.6, and the publication date is , which discloses a high-efficiency grinding equipment for powder coating production, including a base, a preliminary grinding mechanism arranged on the upper end of the base from top to bottom, a powder selection mechanism, The ultra-fine grinding mechanism and the driving mechanism arranged at the lower end of the base to drive the movement of the above-mentioned mechanism; the primary grinding mechanism includes a primary grinding chamber, a rotating shaft arranged in the primary grinding chamber and a grinding roller arranged on the rotating shaft. The side wall of the primary grinding chamber is fixed with a grinding roller ring that matches the grinding roller. Through the mutual cooperation of the preliminary grinding mechanism and the ultrafine grinding mechanism, the powder can be ground more finely. A powder selection mechanism is added in between, which can screen the coarser raw materials and control the feeding at the same time, without accumulation, and realize the function of uniform feeding, and the three mechanisms are driven by the same Institutional drive, high economy.

In the above solution, during the centrifugal grinding, the grinding roller and the inner wall of the grinding chamber are always attached, the grinding method is single, and the grinding roller cannot be avoided when encountering grinding objects containing relatively hard impurities, resulting in large wear of the grinding roller.

Contents of the invention

The object of the present invention is to provide a centrifugal grinding mechanism and grinding device to solve the above-mentioned shortcomings in the prior art.

In order to achieve the above object, the present invention provides the following technical solutions:

A centrifugal grinding mechanism, comprising a grinding sleeve, a grinding cavity is formed inside the grinding sleeve, and a plurality of grinding grooves are vertically spaced on the inner wall of the grinding sleeve, and it is characterized in that,

It also includes a plurality of grinding rollers and a plurality of center columns vertically arranged in the grinding chamber, the grinding rollers are sleeved on the center columns through the through holes with an interference fit, and the outer wall of the center columns is There are at least two positions with inconsistent radial dimensions in the axial direction, so that the gap between each of the grinding rollers and the grinding groove can be adjusted through the movement of the central column in the vertical direction.

In the above-mentioned centrifugal grinding mechanism, the central column includes a parallelogram moving in the vertical direction, the parallelogram is an oblique column with a parallelogram in axial section, and a cavity is provided inside the central column. The parallelogram is located in the cavity, and multiple pairs of adjustment blocks are arranged on the central column, and the multiple pairs of the adjustment blocks are symmetrically spaced on the surface of the central column, and each pair of the adjustment blocks is attached to the surface of the central column respectively. Combined with two different slopes of the parallelogram, the adjustment block slides through the surface of the central column, and an elastic member is connected between the adjustment block and the inner surface of the central column 4 .

The above-mentioned centrifugal grinding mechanism also includes a plurality of limiting discs, the limiting discs are arranged at intervals in the grinding chamber between two adjacent grinding grooves, the surface of the limiting discs is spaced with through holes, and the center The columns are vertically inserted into the through holes on the surface of each limiting disc, and the radial dimension of the through holes is larger than the radial dimension of the central column.

In the above-mentioned centrifugal grinding mechanism, the end of the central column away from the rotating disk is fixed with a material guide plate, and the material guide plate is used to guide the raw materials entering the grinding sleeve into the gap between the grinding sleeve and the grinding roller.

A grinding device, the above-mentioned centrifugal grinding mechanism is arranged in the box, and a feeding pipe is arranged at the upper end of the box, and the feeding pipe extends into the grinding chamber.

In the above-mentioned grinding device, there is a bulk material disc in the box, the central column is arranged on the surface of the bulk material disc, and the bulk material disc is driven by a driving device to rotate to drive the central column to rotate.

In the above-mentioned grinding device, the inner wall of the box is provided with a material retaining ring, the material retaining ring is arranged below the bulk material pan, there is a gap between the material retaining ring and the bulk material pan, and the material retaining ring Used to prevent material from falling off the surface of the bulk pan.

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

In the above-mentioned grinding device, an air inlet is opened on the surface of the box, and the air inlet is arranged below the grinding chamber and communicates with the side chamber.

The above-mentioned grinding device, the upper end of the box body is provided with a discharge pipe, one end of the discharge pipe extends into the box body, a high-pressure fan is connected to the discharge pipe, and the discharge pipe extends into the One end in the box is connected with a powder separator.

The beneficial effect of the present invention is that the motion state and range of motion of the grinding roll can be changed by changing the contact position between the central column and the grinding roll. It is socketed on the center column, so that there is a relative movable position between the grinding roller and the center column, so that when the grinding roller hits a hard object, it can rebound in the opposite direction to reduce the wear caused by the impact.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings that are required in the embodiments. Obviously, the accompanying drawings in the following description are only described in the present invention For some embodiments of the present invention, those skilled in the art can also obtain other drawings according to these drawings.

Fig. 1 is the overall structure schematic diagram of the grinding device provided by the embodiment of the present invention;

Fig. 2 is a schematic view of the first viewing angle of the internal structure of the structure of the grinding device provided by the embodiment of the present invention;

Fig. 3 is a schematic bottom view of the structure of the internal structure of the grinding device provided by the embodiment of the present invention at a second viewing angle;

Fig. 4 is a structural schematic diagram of a central column provided by another embodiment of the present invention;

Fig. 5 is a schematic diagram of the central column structure provided by another embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a first viewing angle of a parallelogram provided by another embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a second viewing angle of a parallelogram provided by another embodiment of the present invention;

Fig. 8 is a schematic diagram of the structure of the first state of the grinding roller provided by another embodiment of the present invention;

Fig. 9 is a schematic diagram of the structure of the second state of the grinding roller provided by another embodiment of the present invention;

Fig. 10 is a schematic structural diagram of an arc-shaped protrusion provided by another embodiment of the present invention;

Fig. 11 is a schematic diagram of the working state of the arc-shaped protrusion provided by another embodiment of the present invention.

Explanation of reference signs:

1. Grinding sleeve; 3. Grinding roller; 4. Center column; 41. Material guide plate; 8. Limiting plate; 91. Parallelogram; 92. Adjusting block; 93. Arc raised part; 10. Box body ; 12, bulk tray; 13, retaining ring; 14, side cavity; 15, discharge pipe; 17, powder separator; 18, air inlet.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1-11, a centrifugal grinding mechanism provided by an embodiment of the present invention includes a grinding sleeve 1, a grinding chamber is formed inside the grinding sleeve 1, and the inner wall of the grinding sleeve 1 is vertically spaced. A plurality of grinding tanks also includes a plurality of grinding rollers 3 and a plurality of center columns 4 vertically arranged in the grinding chamber, and the grinding rollers 3 are sleeved on the center columns 4 through the interference fit of through holes , the outer wall surface of the central column 4 has at least two positions with inconsistent radial dimensions in the axial direction, so that through the movement of the central column 4 in the vertical direction, each of the grinding rollers 3 and the The gap of the grinding tank is adjustable.

Specifically, in this embodiment, a power unit such as a motor drives a main shaft to rotate, and the main shaft drives a turntable to rotate. The central column 4 is movably mounted on the turntable, and is driven by a driving member such as an electric push rod to move up and down. The push rod is fixed on the turntable, and the electric push rod is coaxially fixedly connected with the center column 4 to realize pushing. When the turntable rotates, it drives each of the center columns 4 to make a circular orbital revolution.

Grinding sleeve 1 is a cylindrical structure, and its inner space is the grinding chamber, and its inner wall is formed with a plurality of ring-shaped grinding grooves from top to bottom, such as four or five or more grinding grooves, and grinding rollers 3 The through hole is set on the center column 4 and the radial dimension of the through hole is greater than the radial dimension of the center column 4, so that the grinding roller 3 has a shaking gap on the center column 4, which can be within a certain range Horizontal movement, when grinding, relies on the centrifugal force to make the position of the grinding roller 3 relative to the central column 4 unique. At the same time, in this embodiment, the outer wall surface of the central column 4 has at least two positions with inconsistent radial dimensions in the axial direction , in layman's terms, that is, there are at least two positions with different thicknesses on the central column 4, and the central column 4 can be a non-cylindrical body to achieve this effect. In this way, through the vertical movement of the central column 4, through different radial position to touch the grinding roller 3, the gap between the grinding roller 3 and the grinding groove can be adjusted, such as the center column 4 is a frustum of cone structure, so by moving it up or down the cone structure, it can make the gap between the grinding roller 3 and the grinding groove thicker or The thinner part is used to match the grinding roller 3, thereby adjusting the gap between the grinding roller 3 and the grinding groove. The gap refers to the minimum distance between the grinding roller 3 and the grinding groove in the case of centrifugal grinding movement. What the movement essentially changes is the movement gap of the through hole on the grinding roller 3 in the horizontal direction on the center column 4. When the grinding roller 3 has no radial movement gap on the center column 4, the grinding roller 3 rolls against the grinding groove Grinding, when the grinding roller 3 has a radial movable gap on the central column 4, the grinding roller 3 can rebound when encountering a hard object.

In this embodiment, when the central column 4 is a frustum of cone structure, there are two situations for the through holes of each grinding roller 3. One is that the size of the through holes of each grinding roller 3 is consistent. At this time, the major diameter of the frustum of cone structure The radial end is on the top, and the small radial end is on the bottom. This brings another technical effect, that is, from top to bottom, the gap between each of the grinding rollers 3 and the grinding groove gradually decreases from top to bottom, thereby improving the grinding effect. , the second is that the size of the through holes of each grinding roller 3 is inconsistent, and the change trend is consistent with that of the central column 4, such as the central column gradually becomes thicker from top to bottom, and the through holes of each grinding roller 3 gradually become thicker from top to bottom. become larger, so that the gap between each of the grinding rollers 3 and the grinding groove can be kept consistent, which is still consistent with the grinding gap in the prior art.

The beneficial effect of the embodiment of the present invention is: by changing the contact position between the central column and the grinding roller 3 to change the motion state and range of motion of the grinding roller 3, when grinding materials containing hard impurities, and because the grinding roller 3 passes through The interference fit of the through hole is sleeved on the center column 4, so that there is a relative movable position between the grinding roller 3 and the center column 4, so that the grinding roller 3 can rebound in the opposite direction when it hits a hard object, so as to reduce the impact caused by the impact. wear and tear.

In another embodiment provided by the present invention, a parallelogram 91 capable of moving in the vertical direction is arranged inside the central column 4, and the parallelogram is an oblique column whose axial section is a parallelogram, such as it includes Six faces, the top and bottom of which are the same quadrilateral but staggered by a certain extent in the horizontal direction, so that the four sides are inclined, so that the axial section is a parallelogram, and a cavity is provided inside the central column 4 , the parallelogram 91 is in the cavity, and the central column 4 is also provided with multiple pairs of adjustment blocks 92, each pair of adjustment blocks 92 includes two adjustment blocks 92, and the plurality of pairs of adjustment blocks 92 are vertically spaced Distributed on the parallelogram 91, each pair of two adjustment blocks 92 are symmetrically distributed on the opposite sides of the central column 4, and each pair of two adjustment blocks 92 are attached to the parallelogram 91 respectively On two different slopes, the adjustment block 92 slides through the sliding hole on the surface of the center column 4, and an elastic member (not shown in the figure) is connected between the adjustment block 92 and the inner surface of the center column 4 , such that the central column 4 is a composite dynamic structure, the outside of the central column 4 is a cylindrical structure, and its vertical movement refers to the vertical movement of its internal part structure (parallelogram 91), the described The parallelogram 91 can move vertically relative to the central column 4, and the central column 4 is symmetrically provided with a plurality of pairs of sliding holes sequentially from top to bottom, and each pair of sliding holes is at the same height. 92 slide through each of the sliding holes on the center column 4 one by one, and the adjustment block 92 is located in the through hole on the grinding roller 3, so that the adjustment block 92 can change the pipe perforation during the movement process. The gap size in the radial direction with the central column 4, the parallelogram 91 is vertical in the cavity of the central column 4 and makes the two slopes on the parallelogram 91 close to the parallelogram with each pair of adjustment blocks 92 respectively One end of 91 fits together, and the ends of each of the adjustment blocks 92 away from the parallelogram 91 are on the same plane in the vertical direction so that the telescopic length of each adjustment block 92 is always consistent during the telescopic process, and the adjustment blocks 92 An elastic piece is connected between one end in the cavity and the inner surface of the central column 4, the adjusting block 92 is attached to the surface of the parallelogram 91 under the action of the elastic piece, and one end of the elastic piece is fixed on the other end of the surface of the adjusting block 92 It is fixed on the inner wall of the central column 4 to improve the stability of the adjustment block 92 to prevent the grinding roller 3 from shaking when its surface moves, causing the position change and also playing a reset role. When the adjustment block 92 is pushed outward by the parallelogram 91 , the adjusting block 92 is always attached to the surface of the parallelogram 91 under the action of the elastic member, and the adjusting block 92 is used to adjust the radial dimension of the central column 4 so as to change the through hole between the central column 4 and the grinding roller 3 The size of the gap between the inner walls of the inner wall, and then to adjust the gap size between the grinding roller 3 and the grinding groove. In this embodiment, the center column 4 is fixed on the turntable, and an electric pusher is arranged inside the center column 4 The rod and the output end of the electric push rod are fixed on one end of the parallelogram 91 to complete the vertical movement of the parallelogram 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 parallelogram 91, and the parallelogram 91 is in contact with the adjustment block 92 on the side near the grinding tank. The size of the part begins to increase, so that the adjusting block 92 close to the side of the grinding sleeve is pushed out, thereby pushing the grinding roller 3 until the grinding roller 3 is in contact with the inner wall of the grinding tank (as shown in Figure 8), at this time, the grinding roller 3 is in the Under the limitation of the grinding tank and the central column 4, it can only be rolled against the grinding tank. A grinding space is formed between one end of the grinding roller 3 and the inner wall of the grinding tank. When the material enters the grinding chamber, the material is under the action of centrifugal force Scatter to the inner wall of the grinding tank. When the material passes through the gap between the grinding roller 3 and the grinding tank, it is crushed and crushed by the grinding roller 3. In the second state, when grinding materials containing hard impurities, the electric push rod pushes down the parallelogram 91, and the size of the part of the parallelogram 91 in contact with the adjustment block 92 on the side away from the grinding tank begins to increase , so that the adjustment block 92 is ejected outwards, due to the centrifugal force of the rotation of the turntable, the contact point between the grinding roller 3 and the center column 4 is the row of adjustment blocks 92 on the outer wall of the center column 4 that is close to the central axis of the turntable, (as shown in Figure 9 ), the material in the grinding chamber is crushed, because there is a gap between the through hole of the grinding roller 3 and the center column 4 at this time, when the grinding roller 3 hits the hard object in the grinding tank, the grinding roller 3 can be in the Move radially in the horizontal direction and rebound to reduce wear and tear. In the above two working states, the gap size between the grinding roller 3 and the grinding groove can be adjusted by changing the length of the adjustment block 92 protruding outward. When the adjustment block 92 and the through-hole When the size of the gap between the inner walls of the holes changes, such as becoming smaller, the maximum radius of the grinding roller 3 also becomes smaller when it moves in the circumferential direction, so that the grinding gap between it and the grinding tank becomes larger.

Preferably, for the adjustment block 92 of the centrifugal grinding mechanism provided in the above-mentioned embodiment, the two adjustment blocks 92 of each pair are at the same height, and when the parallelogram 91 moves upward or downward, the adjustment block 92 at different positions moves The distance is the same, which makes the movable gap of the grinding roller 3 from top to bottom in the radial direction of the central column 4 the same, that is to say, although the gap between the grinding roller 3 and the grinding groove can be changed, each grinding in the vertical direction The gap between the roller 3 and the grinding tank is always the same. Since the material is ground from top to bottom, the grinding pressure on the upper grinding roller 3 is high, resulting in inconsistent wear levels of the grinding roller 3, and because the upper grinding roller 3. The high grinding pressure causes the motor to receive a large axial reaction force and affects the service life of the motor. Therefore, in another embodiment, further, the end of the adjustment block 92 away from the parallelogram 91 can be set to a length from top to bottom Decrease successively (as Fig. 7), make from top to bottom different adjusting blocks 92 lengths are not the same when stretching out center post 4 surfaces, thereby make the grinding gap between top to bottom grinding roller 3 and the grinding tank gradually change. Small, the material is ground step by step, reducing the pressure of the upper grinding roller 3 and reducing wear.

Further, when the centrifugal grinding mechanism provided by the above-mentioned embodiment works in the first state (as shown in FIG. 8 ), the grinding roller 3 will generate a large lateral force on one side (such as the left side) of the adjustment block 92 , and this lateral force is completely borne by the parallelogram 91, which will easily cause the deformation of the parallelogram 91 and reduce the service life. Therefore, in another embodiment, a plurality of arcs can be added at intervals on the right side of the parallelogram 91 When the parallelogram 91 moves upwards, when the side adjustment block 92 is pushed out, the arc-shaped protrusion 93 gradually reaches the other side such as the right adjustment block 92 position , so that the other side adjustment block 92 is ejected, and the adjustment blocks 92 on the left and right sides are all attached to the through holes of the grinding roller 3, as shown in Figure (11) when the parallelogram 91 is received by the side of the left adjustment block 92 When the lateral force is applied, the adjustment block 92 on the right side plays a supporting role on the parallelogram 91 to remove the lateral force.

In yet another embodiment provided by the present invention, it also includes a plurality of limiting discs 8, the limiting discs 8 are arranged at intervals in the grinding chamber between two adjacent grinding grooves, and the surfaces of the limiting discs 8 are spaced apart. There are through holes, and the central column 4 is vertically inserted in the through holes on the surface of each limiting disc 8, the radial dimension of the through hole is greater than the radial dimension of the central column 4, and the limiting disc 8 The part between two adjacent grinding tanks in the grinding chamber is arranged at intervals and rotates together with the turntable. The limit discs 8 are fixed on the turntable through a central shaft, and each limit disc 8 is fixedly sleeved on the turntable at intervals. On the central axis, the radial dimension of the through hole is greater than that of the central column 4 so that the central column 4 can move up and down in the through hole without collision, so that the grinding roller 3 can overlap the limit disc 8 Its role is to limit the grinding roller 3 to the grinding tank so that it can always grind the materials in the grinding tank during the movement.

In yet another embodiment provided by the present invention, the end of the central column 4 away from the rotating disk is fixed with a material guide plate 41, and the material guide plate 41 is arranged in the central area of the grinding chamber, and it covers directly above the turntable, so The material guide plate 41 is used to guide the raw material entering the grinding sleeve 1 into the gap between the grinding sleeve 1 and the grinding roller 3 .

Another embodiment of the present invention also provides a grinding device, including a box body 10, the above-mentioned centrifugal grinding mechanism is arranged inside the box body 10, and a feed pipe is arranged at the upper end of the box body 10, and the feed pipe extends Into the grinding chamber, the bulk material before grinding is crushed by the crusher and sent to the feeding pipe by the spiral dragon.

In yet another embodiment provided by the present invention, a bulk material pan 12 is provided inside the box body 10, the central column 4 is arranged on the upper surface of the bulk material pan 12, and the bulk material pan 12 is driven by a driving device to form a The rotating motion drives the central column 4 to rotate, as mentioned above, the bulk material tray 12 is used as a turntable at the same time.

In yet another embodiment provided by the present invention, the inner wall of the box body 10 is provided with a material retaining ring 13, and the material retaining ring 13 is arranged below the bulk material pan 12, and the material retaining ring 13 and the bulk material There is a gap between the discs 12, and the material falls on the surface of the bulk disc 12 after grinding and falls on the surface of the retaining ring 13 under centrifugal action, and then the air blown upwards is blown from between the grinding sleeve 1 and the box. The gap is blown up.

In yet another embodiment provided by the present invention, a side cavity 14 is left between the outer surface of the grinding sleeve 1 and the inner wall of the box body 10, and the powder ground by the centrifugal grinding mechanism falls on the surface of the retaining ring 13, The side cavity 14 is blown up, and the unqualified powder is blown down into the grinding chamber again due to its large weight for grinding, and the qualified powder is sucked out from the top of the box body 10 due to its small weight.

In yet another embodiment provided by the present invention, the surface of the box body 10 is provided with an air inlet 18, and the air inlet 18 is located below the retaining ring 13, and the air inlet 18 is arranged below the grinding chamber and is connected to the side chamber. Connected, the airflow entering from the air inlet 18 crosses the retaining ring 13 and is used for air intake to blow up the material upwards.

In yet another embodiment provided by the present invention, the upper end of the box body 10 is provided with a discharge pipe 15, one end of the discharge pipe 15 extends into the box body 10, and the discharge pipe 15 is connected with a high-pressure Fan 16, one end of the outlet pipe 15 extending into the box 10 is connected with a powder separator 17, under the action of the high-pressure fan 16, negative pressure gas is generated inside the box 10, and the gas enters the box from the air inlet 18 10, the powder is blown upwards, and the qualified powder screened by the powder classifier 17 is discharged out of the box 10, and the unqualified powder falls into the grinding chamber to continue grinding. The powder classifier 17 has a filter mechanism, which can Screen out the qualified powder.

Certain exemplary embodiments of the present invention have been described above only by way of illustration, and it goes without saying that those skilled in the art can use various methods without departing from the spirit and scope of the present invention. The described embodiments are modified. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims (10)

1. A centrifugal grinding mechanism, comprising a grinding cover, the inner side of the grinding cover is formed with a grinding chamber, and the inner wall of the grinding cover is provided with a plurality of grinding grooves at intervals along the vertical, it is characterized in that, It also includes a plurality of grinding rollers and a plurality of center columns vertically arranged in the grinding chamber, the grinding rollers are sleeved on the center columns through the through holes with an interference fit, and the outer wall of the center columns is There are at least two positions with inconsistent radial dimensions in the axial direction, so that the gap between each of the grinding rollers and the grinding groove can be adjusted through the movement of the central column in the vertical direction. 2. The centrifugal grinding mechanism according to claim 1, wherein a parallelogram capable of moving in the vertical direction is arranged in the central column, and the parallelogram is an inclined plane whose axial section is a parallelogram. Cylinder, a cavity is opened inside the central column, the parallelogram is located in the cavity, and multiple pairs of adjustment blocks are arranged on the central column, and the multiple pairs of the adjustment blocks are symmetrically spaced between the The surface of the center column, each pair of the adjustment blocks are attached to two different slopes of the parallelogram, the adjustment blocks slide through the surface of the center column, and the adjustment blocks are connected to the inside of the center column Elastic parts are connected between the surfaces. 3. The centrifugal grinding mechanism according to claim 1, further comprising a plurality of limit discs, the limit discs are arranged at intervals in the grinding chamber between two adjacent grinding grooves, and the limit discs Through holes are spaced apart on the surface of the discs, and the central posts are vertically inserted into the through holes on the surfaces of each limiting disc, and the radial dimension of the through holes is larger than that of the central posts. 4. The centrifugal grinding mechanism according to claim 1, wherein a material guide plate is fixed on the end of the central column away from the rotating disc, and the material guide plate is used to guide the raw materials entering the grinding sleeve into the In the gap between the grinding sleeve and the grinding roller. 5. A grinding device, comprising a casing, characterized in that, the centrifugal grinding mechanism according to any one of claims 1-4 is arranged in the casing, a feeding pipe is arranged at the upper end of the casing, and the feeding pipe is arranged at the upper end of the casing. The feed pipe extends into the grinding chamber. 6. The grinding device according to claim 5, characterized in that, there is a bulk disk in the box, the central column is arranged on the surface of the bulk disk, and the bulk disk is driven by a driving device It is driven to rotate to drive the center column to rotate. 7. The grinding device according to claim 6, wherein a retaining ring is arranged on the inner wall of the box, and the retaining ring is arranged below the bulk material tray, and the retaining ring is connected to the bulk material tray. There is a gap between the trays, and the retaining ring is used to prevent the material from falling from the surface of the bulk tray. 8. The grinding device according to claim 5, characterized in that, there is a side cavity between the outer surface of the grinding sleeve and the inner wall of the grinding box, and the unqualified powder ground by the centrifugal grinding mechanism is passed through the gap Blow up to enter the grinding chamber again for grinding, and the qualified powder is sucked out from the top of the grinding box. 9 . The grinding device according to claim 5 , wherein an air inlet is opened on the surface of the box body, and the air inlet is arranged below the grinding chamber and communicates with the side chamber. 10. The grinding device according to claim 5, characterized in that a discharge pipe is provided at the upper end of the casing, one end of the discharge pipe extends into the casing, and a high-pressure connection is connected to the discharge pipe. A blower fan, one end of the discharge pipe extending into the box body is connected with a powder separator.

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