Centrifugal grinding mechanism and grinding device

Abstract

The present invention discloses a centrifugal grinding mechanism and a grinding device, wherein a grinding cavity is formed on the inner side of the grinding sleeve, a plurality of grinding grooves are arranged on the inner wall of the grinding sleeve along vertical intervals, and the grinding sleeve further comprises a plurality of grinding rollers and a plurality of center columns vertically arranged in the grinding cavity, wherein the grinding rollers are sleeved on the center columns by interference fit through through holes, so that the gaps between the grinding rollers and the grinding grooves can be adjusted by the movement of the center columns in the vertical direction. The present invention provides a centrifugal grinding mechanism and a grinding device, which change the movement state and movement range of the grinding rollers by changing the contact position between the center columns and the grinding rollers. When grinding materials containing hard impurities, and because the grinding rollers are sleeved on the center columns by interference fit through through holes, a relative movable position is provided between the grinding rollers and the center columns, so that when the grinding rollers collide with hard objects, they can rebound in the opposite direction to reduce the wear caused by the collision.

Description

Technical Field

[0001] The invention relates to centrifugal grinding technology, in particular to a centrifugal grinding mechanism and a grinding device. Background Art

[0002] Grinding is a common processing method for making powdered coatings or some powdered materials. Centrifugal grinding uses planetary transmission and the principle of centrifugal motion to grind objects. It has high grinding efficiency. The grinding barrel rotates and revolves at the same time, which greatly improves the friction efficiency between the grinding stone and the material.

[0003] For example, the Chinese patent application number is CN202011269686.6, and the publication date is . The invention discloses a high-efficiency grinding equipment for powder coating production, including a base, a preliminary grinding mechanism arranged at the upper end of the base from top to bottom, a powder selection mechanism, an ultra-fine grinding mechanism and a driving mechanism arranged at the lower end of the base for driving the above-mentioned mechanisms to move; the preliminary grinding mechanism includes a primary grinding chamber, a rotating shaft rotatably arranged in the primary grinding chamber, and a grinding roller arranged on the rotating shaft; a grinding roller ring cooperating with the grinding roller is fixedly mounted on the side wall of the primary grinding chamber; the powder can be ground more finely through the mutual cooperation of the preliminary grinding mechanism and the ultra-fine grinding mechanism; by adding a powder selection mechanism between the preliminary grinding mechanism and the ultra-fine grinding mechanism, the coarser raw materials can be screened and the feeding can be controlled at the same time, and accumulation will not occur, thereby realizing the function of uniform feeding; and the three mechanisms are all driven by the same driving mechanism, which is more economical.

[0004] In the above scheme, when centrifugal grinding is performed, the grinding roller is always in contact with the inner wall of the grinding chamber, the grinding method is single, and when encountering grinding objects containing harder impurities, it cannot be avoided, resulting in severe wear of the grinding roller. Summary of the invention

[0005] The object of the present invention is to provide a centrifugal grinding mechanism and a grinding device to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A centrifugal grinding mechanism comprises a grinding sleeve, a grinding cavity is formed inside the grinding sleeve, and a plurality of grinding grooves are arranged on the inner wall of the grinding sleeve along vertical intervals, characterized in that:

[0008] It also includes a plurality of grinding rollers and a plurality of center columns vertically arranged in the grinding chamber, wherein the grinding rollers are sleeved on the center columns by interference fit through through holes, and the outer wall surface of the center column has at least two positions with inconsistent radial dimensions in the axial direction, so that the gap between each grinding roller and the grinding groove can be adjusted by the movement of the center column in the vertical direction.

[0009] The above-mentioned centrifugal grinding mechanism includes a parallelogram moving in the vertical direction on the center column, and the parallelogram is an oblique column with an axial cross-section of a parallelogram. A cavity is opened inside the center column, and the parallelogram is located in the cavity. The center column is also provided with multiple pairs of adjustment blocks, and the multiple pairs of adjustment blocks are symmetrically distributed on the surface of the center column. Each pair of adjustment blocks is respectively attached to two different inclined surfaces of the parallelogram, and the adjustment blocks slide through the surface of the center column, and an elastic member is connected between the adjustment blocks and the inner surface of the center column 4.

[0010] The above-mentioned centrifugal grinding mechanism also includes a plurality of limit plates, which are spaced apart in the grinding chamber between two adjacent grinding grooves, and through holes are spaced apart on the surface of the limit plates. The center column is vertically inserted into the through holes on the surface of each limit plate, and the radial dimension of the through hole is larger than the radial dimension of the center column.

[0011] In the centrifugal grinding mechanism, a material guide plate is fixed to one end of the central column away from the rotating 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.

[0012] A grinding device, wherein the centrifugal grinding mechanism is arranged in a box body, a feed pipe is arranged at the upper end of the box body, and the feed pipe extends into the grinding chamber.

[0013] In the above-mentioned grinding device, a bulk material disc is arranged in the box body, and the central column is arranged on the surface of the bulk material disc. The bulk material disc is driven by the driving device to rotate and drive the central column to rotate.

[0014] In the above-mentioned grinding device, the inner wall of the box body is provided with a retaining ring, and the retaining ring is arranged below the bulk material tray. A gap is left between the retaining ring and the bulk material tray, and the retaining ring is used to prevent materials from falling from the surface of the bulk material tray.

[0015] In the above-mentioned grinding device, 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 upward through the gap to enter the grinding cavity again for grinding, and qualified powder is sucked out from the top of the grinding box.

[0016] In the above-mentioned grinding device, an air inlet is provided on the surface of the box body, and the air inlet is arranged below the grinding chamber and communicated with the side chamber.

[0017] In the above-mentioned grinding device, a discharge pipe is provided at the upper end of the box, one end of the discharge pipe extends into the box, a high-pressure blower is connected to the discharge pipe, and one end of the discharge pipe extending into the box is connected to a powder selector.

[0018] The beneficial effects of the present invention are as follows: the movement state and movement range of the grinding roller are changed by changing the contact position between the center column and the grinding roller. When grinding materials containing hard impurities, and because the grinding roller is sleeved on the center column with an interference fit through the through hole, a relative movable position is provided between the grinding roller and the center column, so that the grinding roller can rebound in the opposite direction when colliding with a hard object to reduce the wear caused by the impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the overall structure of a grinding device provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the internal structure of the grinding device provided by an embodiment of the present invention from a first viewing angle;

[0022] Figure 3 A bottom view of the internal structure of the grinding device provided by an embodiment of the present invention from a second perspective;

[0023] Figure 4 A schematic structural diagram of a central column provided in another embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the structure of a central column provided in another embodiment of the present invention;

[0025] Figure 6 A schematic diagram of a parallelogram structure from a first viewing angle provided by another embodiment of the present invention;

[0026] Figure 7 A schematic diagram of a parallelogram structure from a second viewing angle provided by another embodiment of the present invention;

[0027] Figure 8 A schematic structural diagram of a grinding roller in a first state provided by another embodiment of the present invention;

[0028] Fig. 9 A schematic diagram of the structure of a grinding roller in a second state provided by another embodiment of the present invention;

[0029] Fig.10 A schematic diagram of the structure of an arc-shaped protrusion provided in another embodiment of the present invention;

[0030] Fig.11A schematic diagram of the working state of the arc-shaped protrusion provided in another embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Grinding sleeve; 3. Grinding roller; 4. Center column; 41. Guide plate; 8. Limit plate; 91. Parallelogram; 92. Adjustment block; 93. Arc-shaped protrusion; 10. Box body; 12. Bulk material plate; 13. Baffle ring; 14. Side cavity; 15. Discharge pipe; 17. Powder selector; 18. Air inlet. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] like Figure 1-11 As shown, a centrifugal grinding mechanism provided by an embodiment of the present invention includes a grinding sleeve 1, a grinding cavity is formed on the inner side of the grinding sleeve 1, a plurality of grinding grooves are arranged on the inner wall of the grinding sleeve 1 along vertical intervals, a plurality of grinding rollers 3 and a plurality of center columns 4 are vertically arranged in the grinding cavity, the grinding rollers 3 are sleeved on the center columns 4 by interference fit through through holes, the outer wall surface of the center column 4 has at least two positions with inconsistent radial dimensions in the axial direction, so that the gap between each grinding roller 3 and the grinding groove can be adjusted by moving the center column 4 in the vertical direction.

[0035] 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 center column 4 is movably installed on the turntable and is driven up and down by a driving member such as an electric push rod. The electric push rod is fixed on the turntable, and the electric push rod is coaxially fixedly connected to the center column 4 to achieve pushing. When the turntable rotates, it drives each of the center columns 4 to perform orbital motion in a circular trajectory.

[0036] The grinding sleeve 1 is a cylindrical structure, and its inner space is the grinding chamber. Its inner wall is formed with multiple annular grinding grooves from top to bottom, such as four or five or more grinding grooves. The grinding roller 3 is sleeved on the central column 4 through a through hole, and the radial dimension of the through hole is larger than the radial dimension of the central column 4, so that the grinding roller 3 has a shaking gap on the central column 4, and it can move horizontally within a certain range. During grinding, the position of the grinding roller 3 relative to the central column 4 is unique by relying on centrifugal force. 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, there are at least two positions of different thicknesses on the central column 4. The central column 4 can be a non-cylindrical body to achieve this effect, so through the center The vertical movement of the column 4 can achieve adjustable gap between the grinding roller 3 and the grinding groove by abutting the grinding roller 3 at different radial positions. For example, the central column 4 is a frustum structure, so by moving the frustum structure up or down, the coarser or finer part can be matched with 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 under centrifugal grinding movement. The vertical movement of the central column 4 essentially changes the horizontal movable gap of the through hole on the grinding roller 3 on the central column 4. When the grinding roller 3 has no radial movable gap on the central column 4, the grinding roller 3 rolls and grinds against the grinding groove. When the grinding roller 3 has radial movable gap on the central column 4, the grinding roller 3 can rebound when encountering hard objects.

[0037] In this embodiment, when the center column 4 is a frustum structure, there are two situations for the through holes of each grinding roller 3. One is that the through holes of each grinding roller 3 have the same size. At this time, the large radial end of the frustum structure is at the top, and the small radial end is at the bottom. This brings about another technical effect, that is, from top to bottom, the gap between each grinding roller 3 and the grinding groove gradually decreases from top to bottom, thereby improving the grinding effect. The second is that the through hole sizes of each grinding roller 3 are inconsistent, and the change trend is consistent with the change trend of the center column 4. For example, the center column gradually becomes thicker from top to bottom, and the through holes of each grinding roller 3 gradually become larger from top to bottom. In this way, the gap between each grinding roller 3 and the grinding groove can be kept consistent, which is still consistent with the grinding gap in the prior art.

[0038] The beneficial effect of the embodiment of the present invention is that the movement state and movement range of the grinding roller 3 are changed by changing the contact position between the center column and the grinding roller 3. When grinding materials containing hard impurities, and because the grinding roller 3 is sleeved on the center column 4 through an interference fit through the through hole, a relative movable position is provided between the grinding roller 3 and the center column 4, so that the grinding roller 3 can rebound in the opposite direction when colliding with a hard object to reduce the wear caused by the impact.

[0039] In another embodiment provided by the present invention, a parallelogram 91 capable of moving in the vertical direction is disposed in the center column 4, and the parallelogram is an oblique column whose axial cross section is a parallelogram. For example, it includes six faces, and its top and bottom faces are the same quadrilateral but are staggered by a certain amplitude in the horizontal direction, so that the four side faces are all inclined surfaces, and the axial cross section is a parallelogram. A cavity is opened inside the center column 4, and the parallelogram 91 is located in the cavity. A plurality of pairs of adjustment blocks 92 are also disposed on the center column 4, and each pair of adjustment blocks 92 includes two adjustment blocks 92. The plurality of pairs of adjustment blocks 92 are vertically spaced and distributed on the parallelogram 91, and the two adjustment blocks 92 of each pair are symmetrically distributed on the center column 4. On the opposite two side surfaces, the two adjusting blocks 92 of each pair are respectively attached to the two different inclined surfaces of the parallelogram 91, and the adjusting blocks 92 slide through the sliding holes on the surface of the central column 4. An elastic member (not shown in the figure) is connected between the adjusting blocks 92 and the inner surface of the central column 4. In this way, 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 parallelogram 91 can move vertically relative to the central column 4. A plurality of pairs of sliding holes are symmetrically arranged on the central column 4 from top to bottom, and each pair of sliding holes is at the same height. A corresponding slide passes through each of the sliding holes on the center column 4, and the adjusting block 92 is in the through hole on the grinding roller 3, so that the adjusting block 92 can change the radial gap size between the tube perforation and the center column 4 during the movement. The parallelogram 91 is vertical in the cavity of the center column 4 and the two inclined surfaces on the parallelogram 91 are respectively fitted with one end of each pair of adjusting blocks 92 close to the parallelogram 91, and the ends of each adjusting block 92 away from the parallelogram 91 are in the same plane in the vertical direction so that the telescopic length of each adjusting block 92 is always consistent during the telescopic process. An elastic member is connected between the end of the adjusting block 92 located in the cavity and the inner surface of the center column 4, and the adjusting The node block 92 is fitted with the surface of the parallelogram 91 under the action of the elastic member. One end of the elastic member is fixed to the surface of the adjustment block 92 and the other end is fixed to the inner wall of the center column 4, which improves the stability of the adjustment block 92 and prevents the grinding roller 3 from shaking and changing its position when moving on its surface, and also plays a reset role. When the adjustment block 92 is pushed outward by the parallelogram 91, the adjustment block 92 is always fitted with the surface of the parallelogram 91 under the action of the elastic member. The adjustment block 92 is used to adjust the radial size of the center column 4, thereby changing the gap size between the center column 4 and the inner wall of the through hole of the grinding roller 3, and then adjusting the gap size between the grinding roller 3 and the grinding groove. In this embodiment, the center column 4 is fixed on the turntable.An electric push rod is arranged inside the central column 4 and the output end of the electric push rod is fixed to one end of the parallelogram 91 to complete the vertical movement of the parallelogram 91.

[0040] Specifically, the centrifugal grinding mechanism provided in this embodiment has at least two working states. In the first state, the electric push rod pulls the parallelogram 91 upward, and the size of the portion where the parallelogram 91 contacts the adjustment block 92 near the grinding groove begins to increase, thereby pushing the adjustment block 92 near the grinding sleeve outward, thereby pushing the grinding roller 3 until the grinding roller 3 contacts the inner wall of the grinding groove (such as Figure 8 As shown in the figure, at this time, the grinding roller 3 can only roll along the grinding groove under the restriction of the grinding groove and the center column 4, and 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 chamber, the material is scattered on the inner wall of the grinding groove under the action of centrifugal force. When the material passes through the gap between the grinding roller 3 and the grinding groove, it is crushed by the grinding roller 3. After being crushed by the upper grinding groove, the material falls into the second grinding groove and is ground by the same principle. In the second state, when grinding materials containing hard impurities, the electric push rod pushes the parallelogram 91 downward, and the size of the part where the parallelogram 91 contacts the adjustment block 92 on the side away from the grinding groove begins to increase, thereby pushing the adjustment block 92 outward. Due to the centrifugal force of the rotating disk, 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 close to the central axis of the turntable (as shown in the figure). Fig. 9 As shown), the material in the grinding chamber is crushed and pulverized. Since 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 groove, the grinding roller 3 can move radially in the horizontal direction and rebound to reduce wear. The above two working states can adjust the gap size between the grinding roller 3 and the grinding groove by changing the outward ejection length of the adjusting block 92. When the gap size between the adjusting block 92 and the inner wall of the through hole changes, such as becoming smaller, the maximum radius of the grinding roller 3 during circumferential motion also becomes smaller, thereby increasing the grinding gap between it and the grinding groove.

[0041] Preferably, the adjusting blocks 92 of the centrifugal grinding mechanism provided in the above embodiment, each pair of the two adjusting blocks 92 are at the same height, and when the parallelogram 91 moves upward or downward, the adjusting blocks 92 at different positions move the same distance, which makes the movable clearance of the grinding rollers 3 from top to bottom in the radial direction of the central column 4 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 on the upper grinding roller 3 is large, resulting in inconsistent wear layers of the grinding roller 3. Moreover, since the grinding pressure on the upper grinding roller 3 is large, the axial reaction force on the motor is also large, affecting the service life of the motor. Therefore, in another embodiment, further, the end of the adjusting block 92 away from the parallelogram 91 can be set to decrease in length from top to bottom (such as Figure 7 ), so that the lengths of the different adjustment blocks 92 from top to bottom are different when they extend out of the surface of the central column 4, so that the grinding gap between the grinding roller 3 and the grinding groove gradually becomes smaller from top to bottom, and the material is ground step by step, reducing the pressure on the upper grinding roller 3 and reducing wear.

[0042] Furthermore, the centrifugal grinding mechanism provided in the above embodiment is operated in the first state (such as Figure 8 As shown in FIG. 1 , the grinding roller 3 will generate a large lateral force on one side (such as the left side) of the adjusting block 92, and this lateral force is completely borne by the parallelogram 91, which may easily cause the parallelogram 91 to deform and reduce its service life. Therefore, in another embodiment, a plurality of arc-shaped protrusions 93 (such as FIG. 1 ) may be further provided at intervals on the right side of the parallelogram 91. Fig.10 ), when the parallelogram 91 moves upward, while the side adjustment block 92 is pushed out, the arc-shaped protrusion 93 gradually reaches the position of the other side, such as the right side adjustment block 92, thereby pushing out the other side adjustment block 92. At this time, the left and right adjustment blocks 92 are both in contact with the through holes of the grinding roller 3, as shown in Figure (11). When the parallelogram 91 is subjected to the lateral force from the left side adjustment block 92, the right side adjustment block 92 supports the parallelogram 91 to remove the lateral force.

[0043] In another embodiment provided by the present invention, it also includes a plurality of limit plates 8, wherein the limit plates 8 are arranged at intervals in the grinding chamber between two adjacent grinding grooves, and through holes are arranged at intervals on the surface of the limit plates 8. The center column 4 is vertically inserted into the through holes on the surface of each limit plate 8, and the radial dimension of the through hole is larger than the radial dimension of the center column 4. The limit plates 8 are arranged at intervals in the part of the grinding chamber between two adjacent grinding grooves and rotate with the turntable, and the limit plates 8 are fixed on the turntable through a central axis, and each limit plate 8 is fixedly sleeved on the central axis at intervals, and the radial dimension of the through hole is larger than the radial dimension of the center column 4 so that the center column 4 can move up and down in the through hole without collision, so that the grinding roller 3 can be overlapped on the limit plate 8, and its function is to limit the grinding roller 3 at the grinding groove so that it can always grind the material in the grinding groove during movement.

[0044] In another embodiment provided by the present invention, a material guide plate 41 is fixed to one end of the center column 4 away from the rotating disk. The material guide plate 41 is arranged in the central area of ​​the grinding chamber and covers the top of the rotating disk. 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.

[0045] Another embodiment of the present invention further provides a grinding device, including a box body 10, wherein the above-mentioned centrifugal grinding mechanism is arranged in 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. Before grinding, large pieces of material are crushed by a crusher and then sent to the feed pipe by a spiral dragon.

[0046] In another embodiment provided by the present invention, a bulk material tray 12 is provided inside the box body 10, and the central column 4 is arranged on the upper surface of the bulk material tray 12. The bulk material tray 12 is driven by a driving device to rotate to drive the central column 4 to rotate. As mentioned above, the bulk material tray 12 is also used as a turntable.

[0047] In another embodiment provided by the present invention, a material retaining ring 13 is provided on the inner wall of the box body 10, and the material retaining ring 13 is arranged below the bulk material tray 12. A gap is left between the material retaining ring 13 and the bulk material tray 12. After grinding, the material falls on the surface of the bulk material tray 12 and falls on the surface of the material retaining ring 13 under the action of centrifugation, and is then blown upward from the gap between the grinding sleeve 1 and the box body by the upwardly blowing air.

[0048] In 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 and is blown upward through the side cavity 14. Unqualified powder is blown into the grinding cavity again for grinding due to its heavy weight, and qualified powder is sucked out from the top of the box body 10 due to its light weight.

[0049] In another embodiment provided by the present invention, an air inlet 18 is opened on the surface of the box body 10, and the air inlet 18 is located below the material blocking ring 13. The air inlet 18 is arranged below the grinding chamber and is connected with the side chamber. The air flow entering from the air inlet 18 passes over the material blocking ring 13 and is used to intake air to blow the material upward.

[0050] In another embodiment provided by the present invention, a discharge pipe 15 is provided at the upper end of the box body 10, one end of the discharge pipe 15 extends into the box body 10, and a high-pressure fan 16 is connected to the discharge pipe 15. The end of the discharge pipe 15 extending into the box body 10 is connected to a powder selector 17. Under the action of the high-pressure fan 16, negative pressure gas is generated inside the box body 10, and the gas enters the box body 10 from the air inlet 18 to blow the powder upward. After being screened by the powder selector 17, qualified powder is discharged from the box body 10, and unqualified powder falls into the grinding chamber for further grinding. The powder selector 17 has a filter mechanism, which can screen out qualified powder according to the size of the powder.

[0051] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A centrifugal grinding mechanism, comprising a grinding sleeve, a grinding cavity is formed inside the grinding sleeve, and a plurality of grinding grooves are arranged on the inner wall of the grinding sleeve along vertical intervals, characterized in that: It also includes a plurality of grinding rollers and a plurality of center columns vertically arranged in the grinding chamber, wherein the grinding rollers are sleeved on the center column through through holes, and the radial size of the through holes is larger than the radial size of the center column, a parallelogram capable of moving in the vertical direction is arranged in the center column, the axial cross-section of the parallelogram is a parallelogram, a cavity is opened inside the center column, the parallelogram is located in the cavity, a plurality of pairs of adjustment blocks are also arranged on the center column, the plurality of pairs of adjustment blocks are symmetrically spaced and distributed on the surface of the center column, each pair of adjustment blocks are respectively attached to two different inclined surfaces of the parallelogram, the adjustment blocks slide through the surface of the center column, and an elastic member is connected between the adjustment block and the inner surface of the center column, The central column is a composite dynamic structure, and the outside of the central column is a cylindrical structure. Its vertical movement refers to the vertical movement of the parallelogram inside it. The parallelogram can move vertically relative to the central column. A plurality of pairs of sliding holes are symmetrically arranged on the central column from top to bottom, and each pair of sliding holes is at the same height. Each of the adjustment blocks slides through each of the sliding holes on the central column one by one. The adjustment block is in the through hole on the grinding roller, so that the adjustment block can change the gap size between the through hole and the central column in the radial direction during the movement. The parallelogram is vertical in the cavity of the central column and the two inclined surfaces on the parallelogram are respectively fitted with one end of each pair of adjustment blocks close to the parallelogram. Each The end of the adjusting block away from the parallelogram is in the same plane in the vertical direction so that the telescopic lengths of the adjusting blocks remain consistent during the telescopic process. The adjusting block fits with the surface of the parallelogram under the action of the elastic member. One end of the elastic member is fixed to the surface of the adjusting block and the other end is fixed to the inner wall of the central column, which improves the stability of the adjusting block and prevents the grinding roller from shaking when moving on its surface, resulting in position changes, and also plays a resetting role. When the adjusting block is pushed outward by the parallelogram, the adjusting block always fits with the surface of the parallelogram under the action of the elastic member. The adjusting block is used to adjust the radial size of the central column to change the gap size between the central column and the inner wall of the through hole of the grinding roller, and then to adjust the gap size between the grinding roller and the grinding groove. It also includes a plurality of limit plates, which are spaced apart in the grinding chamber between two adjacent grinding grooves, and through holes are spaced apart on the surface of the limit plates. The center column is vertically inserted into the through holes on the surface of each limit plate, and the radial dimension of the through hole is greater than the radial dimension of the center column.

2. The centrifugal grinding mechanism according to claim 1, characterized in that: A material guide plate is fixed to one end of the central column away from the limiting 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.

3. A grinding device, comprising a housing, characterized in that: The box body is provided with the centrifugal grinding mechanism according to any one of claims 1 to 2, and the upper end of the box body is provided with a feed pipe, which extends into the grinding chamber.

4. The grinding device according to claim 3, characterized in that: A bulk material tray is arranged in the box body, a central column is arranged on the surface of the bulk material tray, and the bulk material tray is driven by a driving device to rotate to drive the central column to rotate.

5. The grinding device according to claim 4, characterized in that: A material retaining ring is provided on the inner wall of the box body. The material retaining ring is arranged below the bulk material tray. A gap is left between the material retaining ring and the bulk material tray. The material retaining ring is used to prevent materials from falling from the surface of the bulk material tray.

6. The grinding device according to claim 5, characterized in that: A side cavity is left between the outer surface of the grinding sleeve and the inner wall of the box body. Unqualified powder ground by the centrifugal grinding mechanism is blown upward through the gap to enter the grinding cavity again for grinding, while qualified powder is sucked out from the top of the box body.

7. The grinding device according to claim 6, characterized in that: An air inlet is provided on the surface of the box body, and the air inlet is arranged below the grinding chamber and communicated with the side chamber.

8. The grinding device according to claim 3, characterized in that: A discharge pipe is provided at the upper end of the box body, one end of the discharge pipe extends into the box body, a high-pressure blower is connected to the discharge pipe, and one end of the discharge pipe extending into the box body is connected to a powder selector.

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