Wear-resistant high-efficiency jet mill

Abstract

The utility model discloses a wear -resisting type high -efficient airflow pulverizer, including main body casing, be provided with the baffle in main body casing, be provided with the installation platform on the baffle, be provided with a plurality of lining board on the installation platform, the inboard of lining board is provided with side grinding piece, be provided with the laval nozzle on the lateral wall of installation platform, the top of installation platform is provided with machine lid, the middle part of machine lid is provided with the discharge pipe and feed pipe, the top of baffle is provided with bottom grinding piece, the bottom of machine lid is provided with top grinding piece. The utility model discloses a convex portion is set up on bottom grinding piece and top grinding piece, and the side of convex portion towards pulverizing chamber is inclined structure, and the design of slope makes airflow to bring material to produce back vortex flow, promotes big granular material to return to the air jet nozzle pulverizing area of side grinding piece along the slope, and the impact frequency of material is efficiently increased, and the effect of reunion is greatly improved, thereby avoid the material accumulation collision at each grinding piece angle, reduce the wear and tear at the angle, improve the service life of each grinding piece.

Description

Technical Field

[0001] This utility model relates to the field of pulverizer technology, specifically to a wear-resistant and high-efficiency airflow pulverizer. Background Technology

[0002] Air jet mills are mainly used for crushing and classifying hard materials. The working principle of an air jet mill is as follows: air is accelerated into a supersonic airflow through a Laval nozzle. The supersonic airflow causes the material to be crushed to move at high speed in the crushing chamber, causing the material particles to collide and rub against each other and be crushed. The crushed material is discharged from the outlet set at the top with the airflow. In the utility model patent specification of application number CN201821039107.7, entitled "A Wear-Resistant Structure for an Air Jet Mill", a wear-resistant plate structure is disclosed, which is arranged on the main body and the top cover. These wear-resistant plates are mainly used to collide with the material to achieve the function of crushing. However, at present, most wear-resistant plates are flat plate structures, and the side that contacts the material is a flat structure. The wear-resistant plate and the inner arc plate form a perpendicular angle. When the material rotates in the crushing chamber under the drive of the gas, the material often accumulates at the angle between the wear-resistant plate and the inner arc plate and collides. This causes severe wear at the angle between the two, which greatly affects the service life of the entire wear-resistant layer. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a wear-resistant and high-efficiency airflow pulverizer to solve the aforementioned technical problems.

[0004] This utility model embodiment adopts the following technical solution: A wear-resistant high-efficiency airflow pulverizer includes a main body housing. A partition is provided in the lower part of the main body housing. A gap-shaped air cavity exists between the partition and the bottom wall of the main body housing. An air inlet pipe communicating with the air cavity is provided at the bottom of the main body housing. An annular mounting platform is also provided inside the main body housing at a position corresponding to the position above the partition. Several lining plates are evenly distributed along the circumference of the mounting platform's inner wall. Removable side grinding discs are provided on the inner side of each lining plate. Laval nozzles are provided on the side wall at the positions corresponding to each set of liner plates and side grinding plates. A machine cover is provided above the mounting platform. A discharge pipe is provided in the middle of the machine cover. A feed pipe is also provided on one side of the machine cover. Several bottom grinding plates are evenly distributed around the top of the partition plate and are spliced ​​together in sequence. Several top grinding plates are evenly distributed around the bottom of the machine cover and are spliced ​​together in sequence. The bottom grinding plates and the top grinding plates are located in the cavity enclosed by the side grinding plates. The top grinding plates, side grinding plates and bottom grinding plates cooperate with each other to form a crushing chamber.

[0005] The air chamber supplies high-pressure gas to the Laval nozzle in the mounting platform. The liner and the side grinding plate are provided with mounting holes. The air outlet of the Laval nozzle is installed in the mounting holes of the two and blows the high-pressure gas in the air chamber into the grinding chamber. The Laval nozzles are arranged in the mounting platform at an angle.

[0006] The partition plate has an upper boss at its upper center, and the cover has a lower boss at its lower center. The top of the partition plate has an annular ridge near its outer edge, and the bottom of the cover has an outwardly protruding pressure plate at its outer edge. The pressure plate covers the upper end of the mounting platform, and the lower end of the mounting platform is located outside the ridge. The lower end of the liner plate rests on the ridge, and the outer side of the lower end of the side grinding plate rests on the ridge. The inner side of the lower end of the side grinding plate extends into the grinding chamber. The bottom grinding plate is installed between the upper boss and the ridge, and the top grinding plate is installed between the lower boss and the pressure plate.

[0007] The bottom grinding plate and the top grinding plate are fixed by an inner pressure ring at one end facing their respective bosses, the bottom grinding plate is pressed by the extended portion of the side grinding plate at one end facing the convex edge, and the top grinding plate is fixed by an outer pressure ring at one end facing the pressure table.

[0008] The upper part of the bottom grinding plate and the lower end of the top grinding plate are provided with protrusions at the ends away from their respective bosses, and the side of the protrusions facing the grinding chamber has a sloping structure.

[0009] Furthermore, the bottom grinding plate has a first notch groove at the end abutting against the side wall of the upper boss, and the upper boss has a second notch groove at its upper outer edge. The height of the first notch groove is greater than the height of the second notch groove. The first notch groove and the second notch groove cooperate to form a first pressing groove. The inner pressing ring is fixed in the first pressing groove. A pressing groove is formed between the outer side of the protrusion on the bottom grinding plate and the end of the outer edge of the bottom grinding plate. The bottom of the side grinding plate extends inward and covers the pressing groove. The lower end of the side grinding plate is arranged in close contact with the outer side of the protrusion on the bottom grinding plate.

[0010] Furthermore, the top grinding plate has a third notch at its end abutting against the side wall of the lower boss, and the lower boss has a fourth notch at its lower outer edge. The height of the third notch is greater than the height of the fourth notch. The third notch and the fourth notch cooperate to form a second pressing groove. The inner pressing ring is also fixed in the second pressing groove. The top grinding plate has an arc-shaped notch at its outer edge. The arc-shaped notch forms a stepped multi-level pressing groove between the outer side of the protrusion on the top grinding plate and the end of the outer edge of the top grinding plate. One side of the outer pressing ring abuts against the inner side of the pressing platform, and the other side of the outer pressing ring presses onto the pressing groove at the outermost edge of the top grinding plate. The second-level pressing groove of the top grinding plate presses onto the top of the side grinding plate. The upper end of the side grinding plate is arranged in close contact with the outer side of the protrusion on the top grinding plate.

[0011] Furthermore, the inner pressure ring is formed by splicing together several first arc-shaped pressure plates end to end, and the outer pressure ring is formed by splicing together several second arc-shaped pressure plates end to end. The first arc-shaped pressure plates and the second arc-shaped pressure plates are respectively fixed to the partition plate and the machine cover by bolts.

[0012] Furthermore, the mounting platform has a notch at the lower part of its outer periphery. The notch cooperates with the side wall of the main housing and the partition to form an air chamber. The partition has an air inlet at the position corresponding to the air chamber, and the air inlet allows the air chamber and the air cavity to communicate with each other.

[0013] Furthermore, a stainless steel filter cylinder is installed in the air chamber, and the filter cylinder is connected to the Laval nozzle. A compression spring is installed on the side wall of the main housing to press against the filter cylinder and the Laval nozzle.

[0014] Furthermore, the side of the liner that is in contact with the mounting platform is provided with a vertical insertion ridge, and the mounting platform is provided with an insertion groove that matches the insertion ridge. The insertion ridge and the insertion groove are inserted into each other. The side of the liner that is in contact with the side grinding plate is provided with a vertical dovetail groove, and the side grinding plate is provided with an insert that matches the dovetail groove. The side grinding plate is fixed to the liner by the insertion of the insert and the dovetail groove.

[0015] Furthermore, an adjustable grading ring is provided inside the discharge pipe, and a clamping bolt is provided on the outside of the discharge pipe. The screw end of the clamping bolt passes through the discharge pipe and abuts against the outer wall of the grading ring.

[0016] The above-mentioned technical solution of this utility model has the following beneficial effects: By setting a protrusion on the side of the bottom grinding plate and the top grinding plate near the side grinding plate, and the side of the protrusion facing the crushing chamber is a slope structure, the slope design causes the airflow to drive the material to generate a vortex, which causes large particles of material to return to the air jet crushing area of ​​the side grinding plate along the slope. This efficiently increases the impact frequency of the material, greatly improves the deagglomeration effect, thereby avoiding the accumulation and collision of materials at the corners of the grinding plates, reducing wear at the corners, and improving the service life of each grinding plate. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic cross-sectional view of the main body of an embodiment of the present utility model;

[0019] Figure 2 for Figure 1Enlarged view of point A in the middle;

[0020] Figure 3 This is a partial installation diagram of the bottom grinding plate according to an embodiment of the present invention;

[0021] Figure 4 This is a partial installation diagram of the top grinding plate according to an embodiment of the present invention;

[0022] Figure 5 This is a three-dimensional structural diagram of the bottom grinding plate according to an embodiment of the present invention;

[0023] Figure 6 This is a three-dimensional structural diagram of the top grinding plate according to an embodiment of the present invention;

[0024] Figure 7 This is a top view schematic diagram of the installation of the side grinding plate in an embodiment of this utility model. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0027] like Figure 1-7 As shown, this utility model embodiment provides a wear-resistant high-efficiency airflow pulverizer, including a main housing 1. A partition 2 is provided in the lower part of the main housing 1. A gap-shaped air cavity 3 is formed between the partition 2 and the bottom wall of the main housing 1. An air inlet pipe 4 communicating with the air cavity 3 is provided at the bottom of the main housing 1. An annular mounting platform 5 is also provided in the main housing 1 above the partition 2. A plurality of liner plates 6 are evenly distributed along the circumference of the inner wall of the mounting platform 5. A removable side grinding plate 7 is provided on the inner side of the liner plate 6. On the side wall of the mounting platform 5, corresponding to each group of liner plates... Laval nozzles 8 are provided at the positions of 6 and side grinding plates 7. A machine cover 9 is provided above the mounting platform 5. A discharge pipe 10 is provided in the middle of the machine cover 9. A feed pipe 11 is also provided on one side of the machine cover 9. Several bottom grinding plates 12 are evenly distributed around the top of the partition plate 2 and are spliced ​​together in sequence. Several top grinding plates 13 are evenly distributed around the bottom of the machine cover 9 and are spliced ​​together in sequence. The bottom grinding plates 12 and the top grinding plates 13 are both located in the cavity enclosed by the side grinding plates 7. The top grinding plates 13, the side grinding plates 7 and the bottom grinding plates 12 cooperate with each other to form a crushing chamber.

[0028] High-pressure gas is fed into the Laval nozzle 8 in the mounting platform 5 through the air chamber 3. Mounting holes are provided on the liner 6 and the side grinding plate 7. The outlet of the Laval nozzle 8 is installed in the mounting holes of the two and blows the high-pressure gas in the air chamber into the grinding chamber. The Laval nozzles 8 are arranged in the mounting platform 5 at an angle.

[0029] The partition 2 has an upper boss 14 at the middle of its upper end, and the cover 9 has a lower boss 15 at the middle of its lower end. The top of the partition 2 has an annular ridge 16 near its outer edge, and the bottom of the cover 9 has an outwardly protruding pressure plate 37 at its outer edge. The pressure plate 37 presses against the upper end of the mounting platform 5. The lower end of the mounting platform 5 is located outside the ridge 16. The lower end of the liner 6 rests on the ridge 16. The outer side of the lower end of the side grinding plate 7 rests on the ridge 16. The inner side of the lower end of the side grinding plate 7 extends into the crushing chamber. The bottom grinding plate 12 is installed between the upper boss 14 and the ridge 16, and the top grinding plate 13 is installed between the lower boss 15 and the pressure plate 37.

[0030] The bottom grinding plate 12 and the top grinding plate 13 are fixed by an inner pressure ring 17 at one end facing their respective bosses 14. The bottom grinding plate 12 is pressed by the extended portion of the side grinding plate 6 at one end facing the protrusion 16. The top grinding plate 13 is fixed by an outer pressure ring 18 at one end facing the pressure table 37.

[0031] The bottom grinding plate 12 and the lower end of the top grinding plate 13 are provided with a protrusion 19 at the end away from their respective bosses. The side of the protrusion 19 facing the grinding chamber is a slope structure 20, and the slope structure 20 is arranged inclined towards the side grinding plate 6.

[0032] The bottom grinding plate 12 has a first notch 21 at the end of its abutting against the side wall of the upper boss 14. The upper boss 14 has a second notch 26 at its upper outer edge. The height of the first notch 21 is greater than the height of the second notch 26. The first notch 21 and the second notch 26 cooperate to form a first pressing groove. The inner pressing ring 17 is fixed in the first pressing groove. A pressing groove 22 is formed between the outer side of the protrusion 19 on the bottom grinding plate 12 and the end of the outer edge of the bottom grinding plate 12. The bottom of the side grinding plate 7 extends inward and presses against the pressing groove 22. The lower end of the side grinding plate 7 is arranged to fit against the outer side of the protrusion 19 on the bottom grinding plate 12.

[0033] The top grinding plate 13 has a third notch 23 at the end of its side wall against the lower boss 15. The lower boss 15 has a fourth notch 27 at its lower outer edge. The height of the third notch 23 is greater than the height of the fourth notch 27. The third notch 23 and the fourth notch 27 cooperate to form a second pressing groove. The inner pressing ring 17 is also fixed in the second pressing groove. The top grinding plate 13 has an arc-shaped notch 24 at its outer edge. The arc-shaped notch 24 forms a stepped multi-level pressing groove 25 between the outer side of the protrusion 19 on the top grinding plate 13 and the end of the outer edge of the top grinding plate 13. One side of the outer pressing ring 18 is attached to the inner side of the pressing table 37. The other side of the outer pressing ring 18 presses on the pressing groove at the outermost edge of the top grinding plate 13 (i.e., the position corresponding to the arc-shaped notch 24). The second-level pressing groove of the top grinding plate 13 presses on the top of the side grinding plate 7. The upper end of the side grinding plate 7 is attached to the outer side of the protrusion 19 on the top grinding plate 13.

[0034] The inner pressure ring 17 is formed by splicing together several first arc-shaped pressure plates 28 end to end, and the outer pressure ring 18 is formed by splicing together several second arc-shaped pressure plates 29 end to end. The first arc-shaped pressure plates 28 and the second arc-shaped pressure plates 29 are respectively fixed to the partition plate 2 and the machine cover 9 by bolts.

[0035] Inside the main housing 1, the upper end face of the upper boss 14 is flush with the upper end face of the inner pressure ring 17 and the bottom grinding plate 12, and the protrusion 19 on the bottom grinding plate 12 extends upward; inside the cover 9, the lower end face of the lower boss 15 is flush with the lower end face of the inner pressure ring 17 and the top grinding plate 13, and the protrusion 19 on the top grinding plate 13 extends downward.

[0036] Preferably, the top grinding plate 13, the side grinding plate 7, and the bottom grinding plate 12 are made of tungsten carbide.

[0037] The top grinding disc 13 and the bottom grinding disc 12 are both fan-shaped structures, while the side grinding disc 7 is an arc-shaped structure.

[0038] The mounting platform 5 has a notch at the lower part of its outer periphery. The notch cooperates with the side wall of the main casing 1 and the partition 2 to form an air chamber 30. An air inlet is provided on the partition 2 at the position corresponding to the air chamber 30. The air inlet allows the air chamber 30 and the air cavity 3 to communicate with each other.

[0039] A stainless steel filter cylinder 31 is installed inside the gas chamber 30. The filter cylinder 31 is connected to the Laval nozzle 8. The filter cylinder 31 can perform a filtering function to prevent impurities from clogging the Laval nozzle 8, thereby improving the stability of gas delivery by the Laval nozzle 8. A compression spring 32 is installed on the side wall of the main housing 1 to press against the filter cylinder 31 and the Laval nozzle 8.

[0040] A vertical insertion ridge 33 is provided on the side of the liner 6 that is in contact with the mounting platform 5. An insertion groove that matches the insertion ridge 33 is provided on the mounting platform 5. The insertion ridge 33 and the insertion groove are inserted into each other. A vertical dovetail groove is provided on the side of the liner 6 that is in contact with the side grinding plate 7. An insertion strip 34 that matches the dovetail groove is provided on the side grinding plate 7. The side grinding plate 7 is fixed to the liner 6 by the insertion of the insertion strip and the dovetail groove.

[0041] When the side grinding plate 7 and the liner plate 6 are inserted, the two sides of the side grinding plate 7 and the two sides of the liner plate 6 are staggered. That is, after the side grinding plate 7 and the liner plate 6 are spliced, the two sides of the two will present a stepped staggered structure. This can prevent powder from entering along the splicing seam of the side grinding plate 7 and the liner plate 6 and causing wear to the machine body.

[0042] An adjustable grading ring 35 is installed inside the discharge pipe 10. A clamping bolt 36 is installed on the outside of the discharge pipe 10. The screw end of the clamping bolt 36 passes through the discharge pipe 10 and abuts against the outer wall of the grading ring 35. The lower end of the grading ring 35 extends into the interior of the grinding chamber. By adjusting the position of the lower end of the grading ring 35 in the grinding chamber, the size of the material particles after grinding can be achieved. The lower the position of the lower end of the grading ring 35, the smaller the ground particles; the higher the position of the lower end of the grading ring 35, the larger the ground particles.

[0043] In the assembly of this utility model, the liner 6 and the mounting platform 5 are inserted sequentially. After insertion, the liner 6 is reinforced on the mounting platform 5. Then, the bottom grinding plates 12 are sequentially spliced ​​and laid on the partition plate 2, forming a ring structure. The outer side of the bottom grinding plate 12 abuts against the side wall of the protrusion 16, and the inner side of the bottom grinding plate 12 abuts against the side wall of the upper boss 14. Then, the upper side grinding plate 7 is inserted into the liner 6, and the lower end of the side grinding plate 7 is pressed into the outer pressing groove 22 of the bottom grinding plate 12. Then, the first arc-shaped pressing plate 28 is sequentially spliced ​​and pressed onto the upper boss 14 and the inner end of the bottom grinding plate 12. The first arc-shaped pressing plate 28 is fixed with bolts, thus completing the fixing of the bottom grinding plate 12. During assembly, the top grinding plates 13 are sequentially spliced ​​and laid on the machine cover 9. The ring structure formed by the splicing of the top grinding plates 13 is the same as the structure formed by the bottom grinding plates 12. The inner side of the top grinding plates 13 is attached to the side wall of the lower boss 15. The first arc-shaped pressure plates 28 are sequentially spliced ​​and pressed on the inner end of the lower boss 15 and the top grinding plates 13. Then, the second arc-shaped pressure plates 29 are sequentially spliced ​​and pressed on the arc-shaped notch 24 on the outer side of the top grinding plates 13. The two arc-shaped plates are fixed in position with bolts. At this time, the inner pressure ring and the outer pressure ring fix the position of the top grinding plates 13. After the machine cover 9 is pressed on the mounting platform 5, the second pressure groove of the top grinding plates 13 just presses on the inner side of the top of the side grinding plates 7.

[0044] Previously, both ends of the bottom grinding plate 12 and the top grinding plate 13 were inclined structures. When the inner and outer pressure rings were used for pressing, the edges of the two pressure rings were also set with inclined structures. The inclined structures of the grinding plate and the pressure ring were misaligned for pressing, and gaps were easily formed at the joint. The high-pressure gas rotated at high speed in the crushing chamber and easily carried the material into the gaps. This made it easy for the two inclined structures to warp due to wear, which caused great inconvenience to the normal operation of the airflow pulverizer. In this utility model, the setting of the inner first notch groove 21 and the outer pressing groove 22 on the bottom grinding plate 12 allows the inner pressure ring 17 and the side grinding plate 7 to press the bottom grinding plate 12. The setting of the inner third notch groove 23 and the outer multi-stage pressing groove 26 on the top grinding plate 13 allows the inner pressure ring 17 and the outer pressure ring 18 to press the top grinding plate 13. The pressing contact surface was changed from an inclined surface to an angled structure, which can improve the airtightness of the grinding plate after assembly and effectively prevent the warping.

[0045] The working principle of this utility model is as follows: High-pressure gas is transported to the air chamber 3 through the inlet pipe 4 via the pipeline. The high-pressure gas is then transported to the Laval nozzle 8 through the air chamber 30 and blown into the interior of the crushing chamber. The material is transported to the interior of the crushing chamber through the feed pipe 11. Since the Laval nozzle 8 is arranged obliquely along the circumference of the main body shell 1, the high-pressure gas forms an airflow in the crushing chamber, causing the material to rotate in the crushing chamber under the action of the airflow. During the rotation, the material will come into contact with and collide with the top grinding plate 13, the side grinding plate 7, and the bottom grinding plate 12, thereby realizing the crushing operation of the material. A fan is installed outside the airflow crusher. The fan is connected to the discharge pipe 10 through the pipeline. The airflow of the fan is adjusted according to the required particle size of the material, and the height of the classifying ring 35 is also adjusted. The fan blows air outward, so that the crushed material is discharged through the classifying ring 35 and the discharge pipe 10.

[0046] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A wear-resistant, high-efficiency airflow pulverizer, characterized in that: The device includes a main housing, with a partition plate in the lower part of the main housing and a gap-shaped air cavity between the partition plate and the bottom wall of the main housing. An air inlet pipe communicating with the air cavity is provided at the bottom of the main housing. An annular mounting platform is also provided inside the main housing at a position corresponding to the partition plate. Several liners are evenly distributed along the circumference of the inner wall of the mounting platform. Removable side grinding discs are provided on the inner side of the liners. Laval nozzles are provided on the side wall of the mounting platform at positions corresponding to each set of liners and side grinding discs. A cover is provided above the mounting platform. A discharge pipe is provided in the middle of the cover. A feed pipe is also provided on one side of the cover. Several bottom grinding discs are evenly distributed along the circumference of the top of the partition plate and several top grinding discs are evenly distributed along the circumference of the bottom of the cover. The bottom grinding discs and the top grinding discs are located in the cavity enclosed by the side grinding discs. The top grinding discs, side grinding discs and bottom grinding discs cooperate with each other to form a grinding chamber. The air chamber supplies high-pressure gas to the Laval nozzle in the mounting platform. The liner and the side grinding plate are provided with mounting holes. The air outlet of the Laval nozzle is installed in the mounting holes of the two and blows the high-pressure gas in the air chamber into the grinding chamber. The Laval nozzles are arranged in the mounting platform at an angle. The partition plate has an upper boss at its upper center, and the cover has a lower boss at its lower center. The top of the partition plate has an annular ridge near its outer edge, and the bottom of the cover has an outwardly protruding pressure plate at its outer edge. The pressure plate covers the upper end of the mounting platform, and the lower end of the mounting platform is located outside the ridge. The lower end of the liner plate rests on the ridge, and the outer side of the lower end of the side grinding plate rests on the ridge. The inner side of the lower end of the side grinding plate extends into the grinding chamber. The bottom grinding plate is installed between the upper boss and the ridge, and the top grinding plate is installed between the lower boss and the pressure plate. The bottom grinding plate and the top grinding plate are fixed by an inner pressure ring at one end facing their respective bosses, the bottom grinding plate is pressed by the extended portion of the side grinding plate at one end facing the convex edge, and the top grinding plate is fixed by an outer pressure ring at one end facing the pressure table. The upper part of the bottom grinding plate and the lower end of the top grinding plate are provided with protrusions at the ends away from their respective bosses, and the side of the protrusions facing the grinding chamber has a sloping structure.

2. The wear-resistant high-efficiency airflow pulverizer according to claim 1, characterized in that: The bottom grinding plate has a first notch groove at its end abutting against the side wall of the upper boss, and the upper boss has a second notch groove at its upper outer edge. The height of the first notch groove is greater than the height of the second notch groove. The first notch groove and the second notch groove cooperate to form a first pressing groove. The inner pressing ring is fixed in the first pressing groove. A pressing groove is formed between the outer side of the protrusion on the bottom grinding plate and the end of the outer edge of the bottom grinding plate. The bottom of the side grinding plate extends inward and covers the pressing groove. The lower end of the side grinding plate is arranged to fit against the outer side of the protrusion on the bottom grinding plate.

3. The wear-resistant high-efficiency airflow pulverizer according to claim 1, characterized in that: The top grinding plate has a third notch at its end abutting against the side wall of the lower boss. The lower boss has a fourth notch at its lower outer edge. The height of the third notch is greater than the height of the fourth notch. The third notch and the fourth notch cooperate to form a second pressing groove. The inner pressing ring is also fixed in the second pressing groove. The top grinding plate has an arc-shaped notch at its outer edge. The arc-shaped notch forms a stepped multi-level pressing groove between the outer side of the protrusion on the top grinding plate and the end of the outer edge of the top grinding plate. One side of the outer pressing ring abuts against the inner side of the pressing platform, and the other side of the outer pressing ring presses onto the pressing groove at the outermost edge of the top grinding plate. The second-level pressing groove of the top grinding plate presses onto the top of the side grinding plate. The upper end of the side grinding plate is arranged to fit against the outer side of the protrusion on the top grinding plate.

4. A wear-resistant, high-efficiency airflow pulverizer according to any one of claims 1, 2, or 3, characterized in that: The inner pressure ring is formed by splicing together several first arc-shaped pressure plates end to end, and the outer pressure ring is formed by splicing together several second arc-shaped pressure plates end to end. The first arc-shaped pressure plates and the second arc-shaped pressure plates are respectively fixed to the partition and the machine cover by bolts.

5. The wear-resistant high-efficiency airflow pulverizer according to claim 1, characterized in that: The mounting platform has a notch at the lower part of its outer periphery. The notch cooperates with the side wall of the main housing and the partition to form an air chamber. The partition has an air inlet at the position corresponding to the air chamber, and the air inlet allows the air chamber and the air cavity to communicate with each other.

6. The wear-resistant high-efficiency airflow pulverizer according to claim 5, characterized in that: The air chamber is equipped with a stainless steel filter screen, which is connected to the Laval nozzle. A compression spring is provided on the side wall of the main housing to press against the filter screen and the Laval nozzle.

7. The wear-resistant high-efficiency airflow pulverizer according to claim 1, characterized in that: The side of the liner that is in contact with the mounting platform has a vertical insertion ridge. The mounting platform has an insertion groove that matches the insertion ridge. The insertion ridge and the insertion groove are inserted into each other. The side of the liner that is in contact with the side grinding plate has a vertical dovetail groove. The side grinding plate has an insert that matches the dovetail groove. The side grinding plate is fixed to the liner by the insertion of the insert and the dovetail groove.

8. The wear-resistant high-efficiency airflow pulverizer according to claim 1, characterized in that: An adjustable grading ring is installed inside the discharge pipe, and a clamping bolt is installed on the outside of the discharge pipe. The screw end of the clamping bolt passes through the discharge pipe and abuts against the outer wall of the grading ring.

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