An ultrafine grinding and classification machine

Abstract

The present invention discloses an ultrafine grinding classifier, which comprises a frame. A housing is fixedly installed on the frame. The housing is provided with a feed inlet and an air inlet. A classification chamber and a grinding chamber are arranged inside the housing. A partition is arranged between the classification chamber and the grinding chamber. A grinding mechanism is arranged inside the grinding chamber. A classification mechanism is arranged inside the classification chamber. A classification channel and a reflux channel are arranged between the grinding chamber and the classification chamber. The housing is also provided with a discharge port communicating with the fine material outlet of the classification mechanism. The air inlet communicates with the bottom of the grinding chamber. By providing the grinding chamber and the classification chamber, the ground material enters the classification chamber through the classification channel. After passing through the classification mechanism, the particles meeting the particle size requirements pass through the classification mechanism, the fine material outlet and the discharge port and are collected. The large particles that do not meet the particle size requirements enter the grinding chamber from the lower part of the classification chamber through the reflux channel and are ground again, thereby realizing efficient classification and grinding and effectively improving the efficiency of grinding and classification.

Description

Technical Field

[0001] The invention relates to a crushing and classifying machine. Background Art

[0002] In the existing classifier, the feed inlet is located below the classifying wheel, such as the cyclone airflow mill disclosed in CN102441474A. Under the strong centrifugal force generated by the high-speed rotating classifying wheel, the coarse and fine materials moving to the classifying area with the rising airflow are separated, and the fine particles meeting the particle size requirements are collected by the classifying wheel. This requires the classifier to have a large internal space, which makes the classifier high and cannot be flexibly installed and arranged. Summary of the invention

[0003] In order to make up for the above shortcomings, the present invention provides an ultrafine grinding classifier which has high grinding efficiency and can achieve ultrafine grinding.

[0004] The technical solution of the present invention is: an ultrafine grinding and classifying machine, comprising a frame, a shell is fixedly installed on the frame, a feed port and an air inlet are provided on the shell, a grading chamber and a crushing chamber are provided in the shell, a partition is provided between the grading chamber and the crushing chamber, a crushing mechanism is provided in the crushing chamber, a grading mechanism is provided in the grading chamber, a grading channel for the crushed material to enter the upper part of the grading chamber and a reflux channel for large particles to enter the crushing chamber from the lower part of the grading chamber are provided between the crushing chamber and the grading chamber, a discharge port connected to the fine material outlet of the grading mechanism is also provided on the shell, the air inlet is connected to the bottom of the crushing chamber, and the feed port opens in the crushing chamber.

[0005] As a preferred technical solution, the grading mechanism includes a grading wheel rotatably installed in the shell, the grading wheel is transmission-connected to the grading wheel driving mechanism, the crushing mechanism includes a rotating member, the rotating member is transmission-connected to the rotary driving mechanism, a crushing hammer is fixedly installed on the rotating member, and the inner wall of the shell is provided with a lining cooperating with the crushing hammer.

[0006] As a preferred technical solution, the separator is a separating cylinder, the separating cylinder is fixedly installed in the housing, the rotating member is a rotating disk, the rotating disk is located below the separating cylinder, the crushing hammers are fixedly installed on the rotating disk and located outside the separating cylinder, the grading wheel is located inside the separating cylinder, the grading wheel includes an upper end plate and a lower end plate, grading sheets are fixedly installed between the upper end plate and the lower end plate, the grading sheets extend vertically and are spaced from each other, a fine material outlet is provided at the center of the upper end plate, the fine material outlet is located below the discharge outlet and communicates with the discharge outlet, a guiding member is provided on the upper surface of the lower end plate, the guiding member has a guiding surface extending from bottom to top towards the middle of the grading wheel, a grading sealing mechanism surrounding the discharge outlet and the fine material outlet is provided between the upper cavity wall of the grading cavity and the upper end plate, an upper gap is provided between the upper part of the separating cylinder and the housing, the upper gap also serves as the grading channel, the lower end of the separating cylinder is provided with an opening communicating with the crushing cavity, and the opening also serves as the reflux channel.

[0007] As a preferred technical solution, a chassis for closing the lower opening of the separating cylinder is fixedly installed at the bottom of the separating cylinder, the chassis is located above the rotating disk, and the opening is located at the lower end of the barrel wall of the separating cylinder.

[0008] As a preferred technical solution, the crushing hammers are fixedly installed on the upper surface of the rotating disk, the crushing hammers extend along the diameter direction of the rotating disk, the crushing hammers include a large head end and a small head end, and the small head end is close to the outer peripheral surface of the rotating disk.

[0009] As a preferred technical solution, a feed pipe is installed on the housing, the feed pipe is located between the housing and the separating cylinder, a feed inlet is provided at the lower end of the feed pipe, the feed inlet is located above the crushing hammers, the feed inlet is lower than the upper edge of the separating cylinder and higher than the opening.

[0010] As a preferred technical solution, an air inlet cavity is provided in the lower part of the housing, the air inlet cavity communicates with the crushing cavity, the air inlet is communicated with the air inlet cavity, an installation sleeve is fixedly installed in the air inlet cavity, the rotary drive mechanism includes an inner sleeve rotatably installed in the installation sleeve, the rotating disk is fixedly installed on the inner sleeve, the grading wheel drive mechanism includes an inner rotating shaft rotatably installed in the inner sleeve, the upper end of the inner rotating shaft extends out of the inner sleeve and is fixedly installed with the grading wheel, a shaft sealing structure is provided between the upper end of the inner sleeve and the inner rotating shaft, and a rotating disk sealing structure is provided between the installation sleeve and the rotating disk.

[0011] As a preferred technical solution, a diversion ring is provided between the air inlet chamber and the pulverizing chamber. The inner peripheral surface of the diversion ring is an inverted conical surface. An annular gap is provided between the diversion ring and the mounting sleeve, and the air inlet chamber and the pulverizing chamber communicate with each other through the annular gap.

[0012] As a preferred technical solution, a lower retaining ring is provided between the lower end plate of the classification wheel and the chassis. The lower retaining ring is fixedly installed on the lower surface of the chassis and sleeved outside the inner rotating shaft.

[0013] As a preferred technical solution, fan blades are fixedly installed on the outer peripheral surface of the lower retaining ring.

[0014] Due to the adoption of the above technical solution, an ultrafine pulverizing and classifying machine includes a frame, a housing is fixedly installed on the frame, a feed inlet and an air inlet are provided on the housing, a classification chamber and a pulverizing chamber are provided inside the housing, a partition is provided between the classification chamber and the pulverizing chamber, a pulverizing mechanism is provided inside the pulverizing chamber, a classification mechanism is provided inside the classification chamber, a classification channel for the pulverized material to enter the upper part of the classification chamber and a reflux channel for large particles to enter the pulverizing chamber from the lower part of the classification chamber are provided between the pulverizing chamber and the classification chamber, a discharge port communicating with the fine material outlet of the classification mechanism is further opened on the housing, and the air inlet communicates with the bottom of the pulverizing chamber; by providing the pulverizing chamber and the classification chamber, the pulverized material enters the classification chamber through the classification channel, and after passing through the classification mechanism, the particles meeting the particle size requirements pass through the classification mechanism, the fine material outlet and the discharge port and are collected, and the large particles that do not meet the particle size requirements enter the pulverizing chamber from the lower part of the classification chamber through the reflux channel and are pulverized again, thereby realizing efficient classification and pulverization and ensuring that the product particle size meets the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0016] Figure 2 is Figure 1 a partial enlarged view of I in

[0017] Figure 3 is Figure 1 a partial enlarged view of II in

[0018] Figure 4 is a schematic structural diagram of the first pulverizing disk in an embodiment of the present invention;

[0019] Figure 5 is Figure 4 a schematic structural diagram of the pulverizing hammer of the pulverizing disk in

[0020] Figure 6 is a schematic structural diagram of the second pulverizing disk in an embodiment of the invention;

[0021] Figure 7 Schematic diagram of the installation position of the arc-shaped plate in the embodiment of the present invention;

[0022] Figure 8 Schematic diagram of the installation position of the circular pressing plate in the embodiment of the present invention;

[0023] Figure 9 Schematic diagram of the structure of the grading wheel in the embodiment of the present invention. DETAILED DESCRIPTION

[0024] like Figure 1 , Figure 2 , Figure 3 As shown, an ultrafine grinding and classifying machine comprises a frame, on which a shell 1 is fixedly mounted, on which a feed port 2 and an air inlet 3 are provided, a classifying chamber 4 and a crushing chamber 5 are provided in the shell 1, a partition is provided between the classifying chamber 1 and the crushing chamber 5, a crushing mechanism is provided in the crushing chamber 5, a classifying mechanism is provided in the classifying chamber 4, a classifying channel 7 for crushed materials to enter the upper part of the classifying chamber 4 and a reflux channel for large particles to enter the crushing chamber 5 from the lower part of the classifying chamber 4 are provided between the crushing chamber 5 and the classifying chamber 4, a discharge port 10 connected with a fine material outlet 9 of the classifying mechanism is also provided on the shell 1, the air inlet 3 is connected with the bottom of the crushing chamber 5, and the feed port 2 opens in the crushing chamber. By setting the crushing chamber 5 and the grading chamber 4, the crushed material enters the grading chamber 4 through the grading channel 7. After passing through the grading mechanism, the particles that meet the particle size requirements are collected through the grading mechanism through the fine material outlet 9 and the discharge port 10, and the large particles that do not meet the particle size requirements enter the crushing chamber from the lower part of the grading chamber 4 through the reflux channel and are crushed again, thereby achieving efficient grading and crushing, and effectively improving the efficiency of crushing and grading.

[0025] like Figure 1 , Figure 2 , Figure 3 As shown, the grading mechanism includes a grading wheel 11 rotatably mounted in the housing 1, the grading wheel 11 is connected to the grading wheel driving mechanism, the crushing mechanism includes a rotating member, the rotating member is connected to the rotary driving mechanism, a crushing hammer 13 is fixedly mounted on the rotating member, and an inner lining 14 matched with the crushing hammer 13 is provided on the inner wall of the housing 1. The crushing hammer is driven by the rotating member to crush the particles entering between the inner lining 14 and the crushing hammer 13. The grading accuracy can be improved by increasing the rotation speed of the grading wheel, and the particles that do not meet the particle size requirements are crushed again by the crushing mechanism, so that ultra-fine crushing can be achieved.

[0026] Preferably, the separator is a separating cylinder 6, the separating cylinder 6 is fixedly installed in the housing 1, the rotating member is a rotating disk 12, the rotating disk 12 is located below the separating cylinder 6, the crushing hammers 13 are fixedly installed on the rotating disk 12 and located outside the separating cylinder 6, and the grading wheel 11 is located inside the separating cylinder.

[0027] As Figure 9 shown, the grading wheel includes an upper end plate 31 and a lower end plate 33. A grading piece 34 is fixedly installed between the upper end plate 31 and the lower end plate 33. The grading pieces 34 extend vertically and are spaced from each other. A fine material outlet 9 is provided at the center of the upper end plate 31. The fine material outlet 9 is located below the discharge outlet 10 and communicates with the discharge outlet 10. A guiding member 35 is provided on the upper surface of the lower end plate 33. The guiding member has a guiding surface 36 that extends upward from the bottom to the middle of the grading wheel. Fine particles that meet the particle size requirements move upward along the guiding surface 36 of the guiding member 35 that extends upward from the bottom to the middle of the grading wheel and are discharged through the fine material outlet 9, improving the efficiency of fine particles passing through the grading wheel and the grading efficiency.

[0028] As Figure 1 and Figure 2 shown, and a grading sealing mechanism surrounding the discharge outlet 10 and the fine material outlet 9 is provided between the upper cavity wall 30 of the grading cavity 4 and the upper end plate 31. An upper gap is provided between the upper part of the separating cylinder 6 and the housing 1. The upper gap also serves as the grading channel 7. An opening 8 communicating with the crushing cavity 5 is provided at the lower end of the separating cylinder. The opening 8 also serves as the return channel.

[0029] As Figure 1 and Figure 3 shown, a chassis 18 for closing the lower opening of the separating cylinder 6 is fixedly installed at the bottom of the separating cylinder 6. The chassis 18 is located above the rotating disk, and the opening 8 is located at the lower end of the cylinder wall of the separating cylinder 6.

[0030] With the airflow from the air inlet, the material turns over the separating cylinder 6 and enters the grading wheel 11 through the upper gap. Fine particles that meet the particle size requirements pass through the grading wheel 11 and are collected through the discharge outlet 10. The large particles fall downward onto the chassis 18 and then pass through the opening 8 and move out of the separating cylinder. The structure is compact. Moreover, through the setting of the separating cylinder 6, the internal space of the housing is effectively utilized, ensuring the grading operation efficiency.

[0031] As Figure 1 and Figure 2As shown, the grading and sealing mechanism includes an annular sealing air groove provided on the upper cavity wall 30 of the grading cavity 2. The air outlet end of the annular sealing air groove faces the upper end plate 31. A sealing air inlet passage 32 is further provided in the housing 1, and the sealing air inlet passage 32 communicates with the annular sealing air groove. The airflow entering through the sealing air inlet passage 32 enters between the upper surface of the upper end plate 31 and the upper cavity wall 30 through the sealing air groove. The blown airflow prevents particles from entering and does not hinder the rotation of the grading wheel, achieving efficient sealing.

[0032] A circular groove 37 is provided on the upper cavity wall 30, and the upper end plate 31 is located within the circular groove 37.

[0033] To further enhance the sealing effect, the sealing air groove includes a first annular air groove 38 and a second annular air groove 39. The first annular air groove 38 is located outside the second annular air groove 39. An air inlet filter 49 communicating with the sealing air inlet passage 32 is further provided on the housing.

[0034] As Figure 4 and Figure 5 As shown, the crushing hammer 13 is fixedly installed on the upper surface of the rotating disk 12. The crushing hammer 13 extends along the diameter direction of the rotating disk 12. The crushing hammer 13 includes a large head end 19 and a small head end 20, and the small head end 20 is adjacent to the outer peripheral surface of the rotating disk 12.

[0035] As Figures 6 to 8 shown, the width of the large head end is greater than the width of the small head end. Preferably, in this embodiment, the large head end 19 is a cylinder, the small head end 20 is a rectangular block, the diameter of the cylinder is greater than the width of the rectangular block, a vertical groove 40 is provided on the side surface of the cylinder, and one side edge of the rectangular block is clamped into the vertical groove 40. A distance adjusting mechanism is provided between the rectangular block and the cylinder. By adjusting the distance between the large head end 19 and the small head end 20 through the distance adjusting mechanism, the distance between the large head end 19 and the small head end 20 can be changed, thereby adjusting the size of the particles after crushing. Through the distance adjusting mechanism, the distance between the large head end 19 and the small head end 20 is adjusted, and further the distance between the small head end and the inner lining is changed, thereby adjusting the size of the particles after crushing, thus supporting the realization of ultrafine crushing. As Figure 6 shown, the distance adjusting mechanism includes a strip-shaped hole 41 extending along the diameter direction provided on the rotating disk 12. A locking bolt 42 is sleeved in the strip-shaped hole 41. A locking screw hole cooperating with the locking bolt is provided on the rectangular block. A plurality of ribs 43 are provided on the lower surface of the rectangular block, and grooves cooperating with the ribs are provided on the rotating disk. The cooperation between the ribs 43 and the grooves ensures the reliability of the installation and fixation between the rectangular block and the strip-shaped hole.

[0036] AsFigures 6 to 8 As shown, an arc-shaped plate 44 is sleeved outside the cylinder. Clamping strips 45 are provided at both ends of the arc-shaped plate 44, and vertical clamping grooves 46 matching the clamping strips are provided on the side surface of the rectangular block. Through the cooperation of the clamping strips 45 and the vertical clamping grooves 46, the arc-shaped plate 44 can be effectively fixed. When the arc-shaped plate 44 is severely worn, a new arc-shaped plate 44 can be replaced, thereby ensuring the crushing efficiency. Moreover, arc-shaped plates of different sizes can be replaced to adjust the size of the large head end 19, so as to meet the needs of crushing different materials.

[0037] A circular pressing plate 47 is provided on the upper surface of the cylinder. The circular pressing plate 47 presses the arc-shaped plate 44 downward, and a pressing plate locking bolt 48 is provided between the circular pressing plate 47 and the cylinder.

[0038] By pressing the arc-shaped plate 47 downward through the pressing plate locking bolt 48, it is ensured that the arc-shaped plate 44 can be reliably installed and fixed, ensuring that the arc-shaped plate 44 can work effectively.

[0039] As Figure 1 shown, a feed pipe 21 is installed on the housing 1. The feed pipe is located between the housing and the partition cylinder. The lower end of the feed pipe 21 is provided with the feed inlet 2. The feed inlet 2 is located above the crushing hammer 13. The feed inlet 2 is lower than the upper edge of the partition cylinder 6 and higher than the opening 8.

[0040] As Figure 3As shown, an air inlet chamber 22 is provided at the lower part of the housing 1. The air inlet chamber communicates with the pulverizing chamber, and the air inlet 3 communicates with the air inlet chamber 22. An installation sleeve 23 is fixedly installed in the air inlet chamber 22. The rotary drive mechanism includes an inner sleeve 24 rotatably installed in the installation sleeve 23. An inner sleeve drive motor for driving the inner sleeve 24 to rotate is installed on the frame. The rotating disk 12 is fixedly installed on the inner sleeve 24. The grading wheel drive mechanism includes an inner rotating shaft 25 rotatably installed in the inner sleeve 24. An inner rotating shaft drive motor for driving the inner rotating shaft 25 to rotate is installed on the frame. The upper end of the inner rotating shaft 25 extends out of the inner sleeve 24 and the grading wheel 11 is fixedly installed thereon. A shaft sealing structure is provided between the upper end of the inner sleeve 24 and the inner rotating shaft 25, and a rotating disk sealing structure is provided between the installation sleeve 23 and the rotating disk 12. The rotating disk sealing structure includes a bearing cover 50 provided between the installation sleeve 23 and the inner sleeve 24. A plurality of sealing rings 51 are provided on the bearing cover 50, and an annular sealing groove for cooperating with the sealing rings 51 is provided on the lower surface of the rotating disk 12. The arrangement of the annular sealing groove and the sealing rings 51 prevents particles from entering between the installation sleeve 23 and the inner sleeve 24, ensuring the service life of the equipment. The shaft sealing structure includes an upper bearing cover 52 provided between the inner sleeve 24 and the inner rotating shaft, and a sealing ring 53 is installed on the upper bearing cover.

[0041] As Figure 1 and Figure 3 shown, a diversion ring 26 is provided between the air inlet chamber 22 and the pulverizing chamber 5. The inner peripheral surface of the diversion ring 26 is an inverted conical surface. An annular gap 27 is provided between the diversion ring 26 and the installation sleeve 23. The air inlet chamber 22 and the pulverizing chamber 5 communicate with each other through the annular gap 27. The diversion ring blocks the falling of materials, and the air flow can enter the pulverizing chamber through the annular gap 27.

[0042] As Figure 1 、 Figure 3 and Figure 9 shown, a lower retaining ring 28 is provided between the lower end plate 33 of the grading wheel 11 and the chassis 18. The lower retaining ring 28 is fixedly installed on the lower surface of the chassis 18 and sleeved outside the inner rotating shaft 25.

[0043] Fan blades 29 are fixedly installed on the outer peripheral surface of the lower retaining ring 28. The fan blades 29 rotate as the lower retaining ring 28 rotates. The air flow generated by the fan blades blocks the materials from entering the lower surface of the chassis 18.

[0044] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultrafine grinding and classification machine, characterized in that, The invention comprises a frame, a shell is fixedly mounted on the frame, a feed port and an air inlet are arranged on the shell, a grading chamber and a crushing chamber are arranged in the shell, a partition is arranged between the grading chamber and the crushing chamber, a crushing mechanism is arranged in the crushing chamber, a grading mechanism is arranged in the grading chamber, a grading channel for crushed materials to enter the upper part of the grading chamber and a reflux channel for large particles to enter the crushing chamber from the lower part of the grading chamber are arranged between the crushing chamber and the grading chamber, a discharge port connected with the fine material outlet of the grading mechanism is also arranged on the shell, the air inlet is connected with the bottom of the crushing chamber, and the feed port opens in the crushing chamber; the grading mechanism comprises a rotatable device mounted in the shell The grading wheel is connected to the grading wheel driving mechanism through transmission, the crushing mechanism includes a rotating member, the rotating member is connected to the rotary driving mechanism through transmission, a crushing hammer is fixedly mounted on the rotating member, and the inner wall of the shell is provided with a lining that cooperates with the crushing hammer; the separator is a separator cylinder, the separator cylinder is fixedly mounted in the shell, the rotating member is a rotating disk, the rotating disk is located at the lower side of the separator cylinder, the crushing hammer is fixedly mounted on the rotating disk and is located at the outer side of the separator cylinder, the grading wheel is located in the separator cylinder, the grading wheel includes an upper end plate and a lower end plate, a grading sheet is fixedly mounted between the upper end plate and the lower end plate, the grading sheets extend up and down and are spaced apart from each other, A fine material outlet is provided at the center of the upper end plate, and the fine material outlet is located below the discharge port and is communicated with the discharge port. A guide member is provided on the upper surface of the lower end plate, and the guide member has a guide surface extending from bottom to top toward the middle of the grading wheel. A grading sealing mechanism surrounding the discharge port and the fine material outlet is provided between the upper cavity wall of the grading cavity and the upper end plate. An upper gap is provided between the upper part of the separating cylinder and the shell, and the upper gap also serves as the grading channel. An opening communicated with the crushing chamber is provided at the lower end of the separating cylinder, and the opening also serves as the reflux channel. The crushing hammer is fixedly mounted on the upper surface of the rotating disk, and the crushing hammer extends along the diameter direction of the rotating disk. The crushing hammer includes a large head end and a small head end, and the small head end is adjacent to the outer circumference of the rotating disk; the large head end is a cylinder, and the small head end is a rectangular block, the diameter of the cylinder is larger than the width of the rectangular block, the side surface of the cylinder is provided with a vertical groove, and one side edge of the rectangular block is inserted into the vertical groove: a distance adjustment mechanism is provided between the rectangular block and the cylinder; an arc-shaped plate is provided on the outer sleeve of the cylinder, and clamping strips are provided at both ends of the arc-shaped plate, and a vertical clamping groove cooperating with the clamping strip is provided on the side surface of the rectangular block, and a circular pressure plate is provided on the upper surface of the cylinder, and the circular pressure plate presses the arc plate downward, and a pressure plate locking bolt is provided between the circular pressure plate and the cylinder.

2. The ultrafine grinding and classification machine according to claim 1, characterized in that, A bottom plate for closing the lower opening of the separation cylinder is fixedly mounted at the bottom of the separation cylinder. The bottom plate is located above the rotating disk, and the opening is located at the lower end of the cylinder wall of the separation cylinder.

3. The ultrafine grinding and classification machine according to claim 1, characterized in that, A feed pipe is installed on the housing. The feed pipe is located between the housing and the separation cylinder. The lower end of the feed pipe is provided with the feed inlet, which is located above the crushing hammers, lower than the upper edge of the separation cylinder and higher than the opening.

4. The ultrafine grinding and classification machine according to claim 2, wherein An air inlet chamber is provided at the lower part of the housing. The air inlet chamber communicates with the crushing chamber. The air inlet is in communication with the air inlet chamber. An installation sleeve is fixedly installed in the air inlet chamber. The rotary drive mechanism includes an inner sleeve rotatably installed in the installation sleeve. The rotating disk is fixedly installed on the inner sleeve. The grading wheel drive mechanism includes an inner rotating shaft rotatably installed in the inner sleeve. The upper end of the inner rotating shaft extends out of the inner sleeve and is fixedly installed with the grading wheel. A shaft sealing structure is provided between the upper end of the inner sleeve and the inner rotating shaft. A rotating disk sealing structure is provided between the installation sleeve and the rotating disk.

5. The ultrafine grinding and classification machine according to claim 4, characterized in that, A guide ring is provided between the air inlet chamber and the crushing chamber. The inner peripheral surface of the guide ring is an inverted conical surface. An annular gap is provided between the guide ring and the installation sleeve. The air inlet chamber and the crushing chamber communicate with each other through the annular gap.

6. The ultrafine grinding and classification machine according to claim 4, characterized in that A lower retaining ring is provided between the lower end plate of the grading wheel and the chassis. The lower retaining ring is fixedly installed on the lower surface of the chassis and sleeved outside the inner rotating shaft.

7. The ultrafine grinding and classification machine according to claim 6, wherein, Fan blades are fixedly installed on the outer peripheral surface of the lower retaining ring.

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