Net-free universal micro-powder machine

Abstract

The invention discloses a net-free universal micro-powder machine which comprises a material collecting chamber, a crushing chamber, a first crushing mechanism, a second crushing mechanism, a feeding mechanism and an air supply system, the first crushing mechanism comprises a first motor and a first crushing rotating disc, the first crushing rotating disc is arranged in the crushing chamber, a motor shaft of the first motor is in linkage connection with the first crushing rotating disc, and multiple groups of first pin shafts are concentrically arranged on the first crushing rotating disc; the second crushing mechanism comprises a second motor and a second crushing rotating disc, the second crushing rotating disc is arranged in the crushing chamber, a motor shaft of the second motor is in linkage connection with the second crushing rotating disc, and multiple sets of second pin shafts are concentrically arranged on the second crushing rotating disc; a first annular gap is formed between every two adjacent sets of first pin shafts, and a second annular gap is formed between every two adjacent sets of second pin shafts. The beating and shearing structure is adopted for achieving material smashing, the powder making effect is good, the fineness is remarkably improved, and the powder making efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of powder-making equipment technology, and in particular to a meshless universal micro powder mill. Background Technology

[0002] A micro powder mill is a device used for micro-pulverizing materials. The working principle of a micro powder mill is to achieve the purpose of producing a finished product by mechanical crushing and the collision of gas. The crushed material enters the grading zone with the airflow, where the grader separates the material to the required fineness. The coarse material that is not selected is returned to the crushing chamber for further crushing until the required fineness is reached. Then, it is separated out by the grader, and the airflow carrying the fine powder is sent to the cyclone separator to separate the fine powder from the airflow.

[0003] Utility model patent CN208342542U discloses a micronizer, which includes a frame, a housing, a micronizer assembly installed within the housing, and a rotation drive mechanism. The micronizer assembly includes a rotating shaft rotatably installed within the housing, a mounting frame fixedly installed on the rotating shaft, multiple grinding blocks evenly distributed on the mounting frame, and multiple circumferentially distributed arc-shaped grinding blocks within the housing. The multiple arc-shaped grinding blocks form a cylindrical body with gaps between them. The central axis of the cylindrical body is collinear with the central axis of the rotating shaft. The output end of the rotation drive mechanism is connected to the rotating shaft for transmission. In this micronizer, material enters the cylindrical body formed by the arc-shaped grinding blocks through a feed hopper. The rotation drive mechanism drives the rotating shaft to rotate, and the mounting frame drives the grinding blocks to rotate. The material is ground and pulverized between the grinding blocks and the arc-shaped grinding blocks, and the pulverized material escapes through the gaps between the arc-shaped grinding blocks. In this device, the arc-shaped grinding block is stationary, while the grinding block rotates circumferentially under the drive of the mounting frame. During operation, some materials are squeezed and ground, while others are pushed circumferentially by the grinding block. This makes it impossible to grind the materials thoroughly, resulting in poor grinding effect, low fineness, and very low grinding efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a meshless universal micro powder mill. This invention uses a hammering and shearing structure to crush materials, which not only has a good powdering effect and significantly improves the fineness, but also greatly improves the powdering efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a meshless universal micro powder mill, comprising a collection chamber, a crushing chamber, a first crushing mechanism, a second crushing mechanism, a feeding mechanism, and an air supply system; The crushing chamber is installed on the collecting chamber and is connected to the collecting chamber. The feeding mechanism is installed on the crushing chamber for feeding materials. The first crushing mechanism and the second crushing mechanism are respectively installed on both sides of the crushing chamber. The air supply system is used to supply air to the crushing chamber. The first crushing mechanism includes a first motor and a first crushing rotating disk. The first crushing rotating disk is disposed in the crushing chamber. The motor shaft of the first motor is linked to the first crushing rotating disk to drive the first crushing rotating disk to rotate. Multiple sets of first pins are concentrically arranged on the first crushing rotating disk. The second crushing mechanism includes a second motor and a second crushing rotating disk. The second crushing rotating disk is disposed in the crushing chamber and is opposite to the first crushing rotating disk. The motor shaft of the second motor is linked to the second crushing rotating disk to drive the second crushing rotating disk to rotate. Multiple sets of second pins are concentrically arranged on the second crushing rotating disk. A first annular gap is provided between each two adjacent sets of first pins for the corresponding second pin to extend into, and a second annular gap is provided between each two adjacent sets of second pins for the corresponding first pin to extend into.

[0006] The present invention is further configured such that the outer periphery of the first pin shaft is provided with a first circular surface and a first triangular surface, and the outer periphery of the second pin shaft is provided with a second circular surface and a second triangular surface. When the first motor and the second motor rotate forward, the working surfaces of the first pin shaft and the second pin shaft are the corresponding first circular surface and the second circular surface. When the first motor and the second motor rotate in reverse, the working surfaces of the first pin shaft and the second pin shaft are the corresponding first triangular surface and the second triangular surface.

[0007] The invention is further configured such that: the first crushing rotating disk has a plurality of first through holes concentrically arranged, the number of which is equivalent to the number of first pins; the first pins pass through the corresponding first through holes from the side of the first crushing rotating disk away from the second crushing rotating disk; and the first pins are provided with first limiting flanges; a first fixing plate for pressing the first limiting flanges on the first pins onto the first crushing rotating disk is installed on the side of the first crushing rotating disk away from the second crushing rotating disk by fasteners; the second crushing rotating disk has a plurality of second through holes concentrically arranged, the number of which is equivalent to the number of second pins; the second pins pass through the corresponding second through holes from the side of the second crushing rotating disk away from the first crushing rotating disk; and the second pins are provided with second limiting flanges; a second fixing plate for pressing the second limiting flanges on the second pins onto the second crushing rotating disk is installed on the side of the second crushing rotating disk away from the first crushing rotating disk by fasteners.

[0008] The present invention is further configured such that the first crushing rotating disk has multiple concentric first stepped grooves on the side near the second crushing rotating disk, and the second crushing rotating disk has multiple concentric second stepped grooves on the side near the first crushing rotating disk. Each set of first pins and second pins are respectively installed on the protrusions of the first stepped groove and the second stepped groove, and the end of each set of first pins extends into the recess of the corresponding first stepped groove, and the end of each set of second pins extends into the recess of the corresponding second stepped groove.

[0009] The invention is further configured such that: the first motor is connected to the grinding chamber via a first flange; the motor shaft of the first motor passes through the first flange; a first bushing is mounted on the outer periphery of the motor shaft; one end of the first bushing inside the grinding chamber is turned outward and linked to the first grinding rotating disk; a first air inlet gap is provided between the first bushing and the first flange, and between the first grinding rotating disk and the inner wall of the grinding chamber; the first flange is provided with a first air inlet channel for connecting the first air inlet gap to the air supply system; the second motor is connected to the grinding chamber via a second flange; the motor shaft of the second motor passes through the second flange; a second bushing is mounted on the outer periphery of the motor shaft; one end of the second bushing inside the grinding chamber is linked to the second grinding rotating disk; a second air inlet gap is provided between the second bushing and the second flange, and between the second grinding rotating disk and the inner wall of the grinding chamber; the second flange is provided with a second air inlet channel for connecting the second air inlet gap to the air supply system.

[0010] The present invention is further configured such that the first air inlet gap between the first bushing and the first flange gradually increases in the direction close to the crushing chamber, and a spiral air duct is provided on the inner wall of the first bushing along the axial direction.

[0011] The present invention is further configured such that the feeding mechanism includes a feeding head, a third motor, and a discharge fork wheel. The feeding head is installed on the upper part of the first flange, and the first flange is provided with a feeding port that connects the feeding head to the first air inlet gap. The first bushing has a plurality of discharge holes arranged in a circumferential array at the corresponding outward position. The discharge fork wheel is located inside the feeding head near the bottom outlet. The third motor is located on the side of the feeding head, and the motor shaft of the third motor extends into the feeding head and is linked to the discharge fork wheel.

[0012] The present invention is further configured such that the feeding mechanism includes a magnetically vibrating screen, which is disposed below the unloading fork wheel.

[0013] The invention is further configured such that the grinding chamber includes a hollow grinding body, a movable door panel, and a locking assembly. The movable door panel is hinged to the open end of the grinding body. The first grinding mechanism and the second grinding mechanism are respectively installed on the grinding body and the movable door panel. The locking assembly includes a locking pin disposed on the side of the grinding body. A locking screw is rotatably disposed on the locking pin. The end of the locking screw is provided with a screw handle. A locking hole for the locking screw to be inserted is provided at the edge of the movable door panel. A conical sealing part is provided on the inner side of the movable door panel. When the movable door panel is fastened to the grinding body and the locking screw is inserted into the locking hole, the conical sealing part on the movable door panel abuts against the open end of the grinding body.

[0014] The invention is further configured to include a filter installed at the air outlet of the grinding chamber.

[0015] Compared with the prior art, the present invention has the following beneficial effects: A. No mesh structure, allowing unobstructed flow between the crusher and the collection chamber.

[0016] B employs a hammering and shearing structure with opposite rotational speeds, which improves the fineness.

[0017] C. The fineness can be adjusted by the motor speed and the arrangement of the crushing pins.

[0018] D. Do not use large filtration and ventilation equipment.

[0019] E. The equipment has low noise and is easy to install and debug.

[0020] F, depending on the raw materials, various materials, shapes, distribution densities, and motor speed variations can be used to achieve micro-pulverization.

[0021] G. Mechanical seals are not used at the relative rotating seals; instead, compressed gas isolation sealing is employed.

[0022] H, the feed inlet is equipped with a magnetic vibrating screen to select iron blocks and oversized raw materials for feeding.

[0023] I. Both the feeding system and the crushing system are automatically controlled by a microcomputer.

[0024] J adopts a feeding method through the motor's rotating shaft, which optimizes the feeding effect. Attached Figure Description

[0025] Figure 1 This is a perspective view of the entire invention; Figure 2 This is a cross-sectional view of the main view of the present invention; Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle; Figure 4 for Figure 3 Enlarged structural diagram of section B in the middle; Figure 5 This is a cross-sectional view of the second crushing mechanism of the present invention; Figure 6 This is a cross-sectional view of the first crushing mechanism of the present invention; Figure 7 This is a schematic diagram of the structure of the present invention in the open state; Figure 8 for Figure 7 Enlarged structural diagram of section C; Figure 9for Figure 8 Enlarged structural diagram of section D in the middle; Figure 10 This is a schematic diagram of the installation structure of the second crushing rotating disk and the second pin shaft of the present invention.

[0026] In the diagram: 1. Collection chamber; 2. Crushing chamber; 3. First crushing mechanism; 4. Second crushing mechanism; 5. Feeding mechanism; 6. First motor; 7. First crushing rotating disk; 8. First pin; 9. Second motor; 10. Second crushing rotating disk; 11. Second pin; 12. First annular gap; 13. Second annular gap; 14. First circular surface; 15. First triangular surface; 16. Second circular surface; 17. Second triangular surface; 18. First through hole; 19. First limiting flange; 20. First fixing plate; 21. Second through hole; 22. Second limiting flange; 23. Second fixing plate; 24. First stepped groove 25. Second stepped groove; 26. First flange; 27. First bushing; 28. First air inlet gap; 29. ​​First air inlet channel; 30. Second flange; 31. Second bushing; 32. Second air inlet gap; 33. Second air inlet channel; 34. Spiral air duct; 35. Feed head; 36. Third motor; 37. Unloading fork wheel; 38. Feed inlet; 39. Discharge hole; 40. Magnetic vibrating screen; 41. Crushing body; 42. Movable door panel; 43. Locking assembly; 44. Locking pin; 45. Locking screw; 46. Screw handle; 47. Lock hole; 48. Conical sealing part; 49. Filter. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example: As attached Figures 1-10 The meshless universal micro powder mill shown includes a collection chamber 1, a crushing chamber 2, a first crushing mechanism 3, a second crushing mechanism 4, a feeding mechanism 5, and an air supply system; The crushing chamber 2 is a combination of a semi-circular upper part and a square thick-walled lower part. It has an opening at the bottom, and motor shaft insertion holes are opened in the middle of the rear baffle and the middle of the front baffle. The crushing chamber 2 is installed on the collection chamber 1 and is connected to the collection chamber 1. The feeding mechanism 5 is installed on the crushing chamber 2 for feeding materials. The first crushing mechanism 3 and the second crushing mechanism 4 are respectively installed on both sides of the crushing chamber 2. The air supply system is used to supply air to the crushing chamber 2. The first crushing mechanism 3 includes a first motor 6 and a first crushing rotating disk 7. The first crushing rotating disk 7 is disposed in the crushing chamber 2. The motor shaft of the first motor 6 is linked to the first crushing rotating disk 7 to drive the first crushing rotating disk 7 to rotate. Multiple sets of first pins 8 are concentrically arranged on the first crushing rotating disk 7. The shape of the first pins 8 can be circular or polygonal. The second crushing mechanism 4 includes a second motor 9 and a second crushing rotating disk 10. The second crushing rotating disk 10 is disposed in the crushing chamber 2 and is disposed opposite to the first crushing rotating disk 7. The motor shaft of the second motor 9 is linked to the second crushing rotating disk 10 to drive the second crushing rotating disk 10 to rotate. Multiple sets of second pins 11 are concentrically arranged on the second crushing rotating disk 10. A first annular gap 12 is provided between each two adjacent sets of first pins 8 for the corresponding second pin 11 to extend into, and a second annular gap 13 is provided between each two adjacent sets of second pins 11 for the corresponding first pin 8 to extend into. The first crushing rotating disk 7 and the second crushing rotating disk 10 are installed correspondingly to each other, and the first pins 8 and the second pins 11 are interlocked.

[0029] The materials of the first pin 8 and the second pin 11 can be selected from alloy steel, stainless steel, hard alloy, high-speed steel, ceramic materials, etc., depending on the characteristics of the material to be crushed. Furthermore, the working parts of the first pin 8 and the second pin 11 are processed into different shapes on the front and back sides to facilitate the crushing of different raw materials. The round end face is suitable for crushing oily raw materials, and the ridged end face is suitable for crushing fibrous materials.

[0030] The first motor 6 and the second motor 9 are high-speed, speed-regulating motors capable of forward and reverse rotation. The outer periphery of the first pin 8 is provided with a first circular surface 14 and a first triangular surface 15, and the outer periphery of the second pin 11 is provided with a second circular surface 16 and a second triangular surface 17. When the first motor 6 and the second motor 9 rotate forward, the working surfaces of the first pin 8 and the second pin 11 are the corresponding first circular surface 14 and the second circular surface 16 (suitable for crushing oily materials). When the first motor 6 and the second motor 9 rotate in reverse, the working surfaces of the first pin 8 and the second pin 11 are the corresponding first triangular surface 15 and the second triangular surface 17 (suitable for crushing fibrous materials). Multifunctionality can be achieved without changing or replacing any components (only changing the direction of motor rotation).

[0031] The first grinding rotating disk 7 has multiple sets of first through holes 18 (the number of first through holes 18 can be circular or other polygonal shapes) concentrically arranged on it, corresponding to the number of first pins 8. The first pins 8 pass through the corresponding first through holes 18 from the side of the first grinding rotating disk 7 away from the second grinding rotating disk 10, and the first pins 8 are provided with first limiting flanges 19. A first fixing plate 20 for pressing the first limiting flanges 19 on the first pins 8 onto the first grinding rotating disk 7 is installed on the side of the first grinding rotating disk 7 away from the second grinding rotating disk 10 by fasteners. The second crushing rotating disk 10 is concentrically provided with multiple sets of second through holes 21 (the number of second through holes 21 can be circular or other polygonal shapes) corresponding to the number of second pins 11. The second pins 11 pass through the corresponding second through holes 21 from the side of the second crushing rotating disk 10 away from the first crushing rotating disk 7, and the second pins 11 are provided with second limiting flanges 22. The side of the second crushing rotating disk 10 away from the first crushing rotating disk 7 is fitted with a second fixing plate 23 by fasteners for pressing the second limiting flanges 22 on the second pins 11 onto the second crushing rotating disk 10.

[0032] The first crushing rotating disk 7 has multiple concentric first stepped grooves 24 (rack-shaped) on the side near the second crushing rotating disk 10, and the second crushing rotating disk 10 has multiple concentric second stepped grooves 25 on the side near the first crushing rotating disk 7. Each set of first pins 8 and second pins 11 are evenly installed on the protrusions of the first stepped grooves 24 and the second stepped grooves 25, respectively. The end of each set of first pins 8 extends into the recess of the corresponding first stepped groove 24, and the end of each set of second pins 11 extends into the recess of the corresponding second stepped groove 25, to prevent uncrushed material from directly leaking down and being discharged into the collection chamber 1.

[0033] The first pin 8 on the first crushing disc 7 and the second pin 11 on the second crushing disc 10 are replaceable. The specific selection depends on the characteristics of the raw material to be crushed. The shape, size, material, number of pins, and number of stepped grooves on the crushing disc are selected. Furthermore, the more pins on each convex ring, the faster the rotation and the finer the output material; conversely, the output material becomes coarser. Furthermore, if the number of pins per ring remains unchanged and the motor speed remains unchanged, the more stepped convex rings installed on the pins, the finer the output material; conversely, the output material becomes coarser.

[0034] The first motor 6 is connected to the grinding chamber 2 via the first flange 26. The motor shaft of the first motor 6 passes through the first flange 26, and a first bushing 27 is mounted on the outer periphery of the motor shaft. One end of the first bushing 27 located inside the grinding chamber 2 is turned outward (in a trumpet shape, with the front end of the trumpet being flange-shaped) and is linked to the first grinding rotating disk 7. A first air inlet gap 28 is provided between the first bushing 27 and the first flange 26, and between the first grinding rotating disk 7 and the inner wall of the grinding chamber 2, to facilitate the discharge of compressed gas into the grinding chamber 2. The first flange 26 is provided with a first air inlet channel 29 for connecting the first air inlet gap 28 to the air supply system. The compressed gas entering through the first air inlet channel 29 forms a spiral movement process that blocks the powder flowing out of the grinding chamber 2. The second motor 9 is connected to the second flange 30 via the second flange 30. The grinding chamber 2 is connected, and the motor shaft of the second motor 9 passes through the second flange 30. The second bushing 31 is installed around the outer periphery of the motor shaft of the second motor 9. One end of the second bushing 31 located in the grinding chamber 2 is linked to the second grinding rotating disk 10. A second air inlet gap 32 is provided between the second bushing 31 and the second flange 30 and between the second grinding rotating disk 10 and the inner wall of the grinding chamber 2. The second air inlet gap 32 facilitates the discharge of compressed gas into the grinding chamber 2. The second flange 30 is provided with a second air inlet channel 33 for connecting the second air inlet gap 32 to the air supply system. There can be several second air inlet channels 33. The second air inlet channel 33 is tangent to the inner cylindrical surface of the second flange 30 and has a certain backward tilt angle, which is conducive to the spiral blowing of external gas, thereby preventing powder from flowing into the motor shaft.

[0035] The first air inlet gap 28 between the first bushing 27 and the first flange 26 gradually increases in the direction close to the crushing chamber 2, and a spiral air duct 34 is provided on the inner wall of the first bushing 27 along the axial direction.

[0036] The feeding mechanism 5 includes a feeding head 35, a third motor 36, and a discharge fork wheel 37 (or a screw). The feeding head 35 is installed on the upper part of the first flange 26, and the first flange 26 is provided with a feeding port 38 that connects the feeding head 35 to the first air inlet gap 28. The first bushing 27 has a plurality of discharge holes 39 arranged in a circumferential array at the corresponding outward position. The discharge fork wheel 37 is located inside the feeding head 35 near the bottom outlet. The third motor 36 is located on the side of the feeding head 35, and the motor shaft of the third motor 36 extends into the feeding head 35 and is linked to the discharge fork wheel 37. The third motor 36 is a speed-regulating motor to adjust the feeding speed.

[0037] The feeding mechanism 5 also includes a magnetically vibrating screen 40, which is located below the unloading fork wheel 37. The magnetically vibrating screen 40 removes iron blocks mixed in the raw material and selects oversized raw materials to enter the crushing mechanism, preventing damage to the equipment or affecting the crushing particle size.

[0038] The grinding chamber 2 includes a hollow grinding body 41, a movable door panel 42, and a locking assembly 43. The movable door panel 42 is hinged to the open end of the grinding body 41, and the two are interlocked with an angled fit. The first grinding mechanism 3 and the second grinding mechanism 4 are respectively installed on the grinding body 41 and the movable door panel 42. The locking assembly 43 includes a locking pin 44 disposed on the side of the grinding body 41, and a locking screw 45 is rotatably disposed on the locking pin 44. The end of 5 is provided with a screw handle 46, and the edge of the movable door panel 42 is provided with a lock hole 47 for the locking screw 45 to be inserted. The inner side of the movable door panel 42 is provided with a conical sealing part 48. When the movable door panel 42 is fastened on the crushing body 41 and the locking screw 45 is inserted into the lock hole 47, the conical sealing part 48 on the movable door panel 42 abuts against the opening end of the crushing body 41, and a sealing ring and a limiting piece are installed between the conical sealing part 48 of the movable door panel 42 and the front end face of the crushing chamber 2.

[0039] The micro powder mill also includes a filter 49. The collection chamber 1 and the base are integrated. The filter 49 is installed at the air outlet of the crushing chamber 2 to discharge excess gas in the collection chamber 1. Furthermore, there is a movable door in front of the collection chamber 1.

Claims

1. A meshless universal micro powder mill, characterized in that: It includes a collection chamber (1), a crushing chamber (2), a first crushing mechanism (3), a second crushing mechanism (4), a feeding mechanism (5), and an air supply system; The crushing chamber (2) is installed on the collection chamber (1) and is connected to the collection chamber (1). The feeding mechanism (5) is installed on the crushing chamber (2) for feeding materials. The first crushing mechanism (3) and the second crushing mechanism (4) are respectively installed on both sides of the crushing chamber (2). The air supply system is used to supply air to the crushing chamber (2). The first crushing mechanism (3) includes a first motor (6) and a first crushing rotating disk (7). The first crushing rotating disk (7) is disposed in the crushing chamber (2). The motor shaft of the first motor (6) is linked to the first crushing rotating disk (7) to drive the first crushing rotating disk (7) to rotate. Multiple sets of first pins (8) are concentrically arranged on the first crushing rotating disk (7). The second crushing mechanism (4) includes a second motor (9) and a second crushing rotating disk (10). The second crushing rotating disk (10) is disposed in the crushing chamber (2). And is arranged opposite to the first crushing rotating disk (7). The motor shaft of the second motor (9) is linked to the second crushing rotating disk (10) to drive the second crushing rotating disk (10) to rotate. Multiple sets of second pins (11) are arranged concentrically on the second crushing rotating disk (10). A first annular gap (12) is provided between each two adjacent sets of first pins (8) for the corresponding second pin (11) to extend into, and a second annular gap (13) is provided between each two adjacent sets of second pins (11) for the corresponding first pin (8) to extend into.

2. The meshless universal micro powder mill according to claim 1, characterized in that: The first pin (8) has a first circular surface (14) and a first triangular surface (15) on its outer periphery, and the second pin (11) has a second circular surface (16) and a second triangular surface (17) on its outer periphery. When the first motor (6) and the second motor (9) rotate forward, the working surfaces of the first pin (8) and the second pin (11) are the first circular surface (14) and the second circular surface (16) corresponding to each other. When the first motor (6) and the second motor (9) rotate in reverse, the working surfaces of the first pin (8) and the second pin (11) are the first triangular surface (15) and the second triangular surface (17) corresponding to each other.

3. The meshless universal micro powder mill according to claim 1, characterized in that: The first crushing rotating disk (7) has multiple sets of first through holes (18) arranged concentrically, with the number of holes corresponding to the number of first pins (8). The first pins (8) pass through the corresponding first through holes (18) from the side of the first crushing rotating disk (7) away from the second crushing rotating disk (10). The first pins (8) are provided with first limiting flanges (19). A first fixing plate (20) for pressing the first limiting flanges (19) on the first pins (8) onto the first crushing rotating disk (7) is installed on the side of the first crushing rotating disk (7) away from the second crushing rotating disk (10) by fasteners. The two crushing rotating disks (10) are concentrically provided with multiple sets of second through holes (21) with a number equivalent to the number of second pins (11). The second pins (11) pass through the corresponding second through holes (21) from the side of the second crushing rotating disk (10) away from the first crushing rotating disk (7). The second pins (11) are provided with second limiting flanges (22). The side of the second crushing rotating disk (10) away from the first crushing rotating disk (7) is fitted with a second fixing plate (23) by fasteners to press the second limiting flanges (22) on the second pins (11) onto the second crushing rotating disk (10).

4. The meshless universal micro powder mill according to claim 3, characterized in that: The first crushing rotating disk (7) has multiple concentric first stepped grooves (24) on the side near the second crushing rotating disk (10), and the second crushing rotating disk (10) has multiple concentric second stepped grooves (25) on the side near the first crushing rotating disk (7). Each set of first pins (8) and second pins (11) are respectively installed on the protrusions of the first stepped grooves (24) and the second stepped grooves (25), and the end of each set of first pins (8) extends into the recess of the corresponding first stepped groove (24), and the end of each set of second pins (11) extends into the recess of the corresponding second stepped groove (25).

5. The meshless universal micro powder mill according to claim 3, characterized in that: The first motor (6) is connected to the crushing chamber (2) through the first flange (26). The motor shaft of the first motor (6) passes through the first flange (26), and the first bushing (27) is installed on the outer periphery of the motor shaft of the first motor (6). One end of the first bushing (27) located in the crushing chamber (2) is turned outward and linked to the first crushing rotating disk (7). A first air inlet gap (28) is provided between the first bushing (27) and the first flange (26) and between the first crushing rotating disk (7) and the inner wall of the crushing chamber (2). A first air inlet channel (29) is provided on the first flange (26) for connecting the first air inlet gap (28) to the air supply system. The second motor (9) is connected to the crushing chamber (2) through the second flange (30). The motor shaft of the second motor (9) passes through the second flange (30), and a second bushing (31) is installed around the outer periphery of the motor shaft of the second motor (9). One end of the second bushing (31) located in the crushing chamber (2) is connected to the second crushing rotating disk (10). A second air inlet gap (32) is provided between the second bushing (31) and the second flange (30) and between the second crushing rotating disk (10) and the inner wall of the crushing chamber (2). A second air inlet channel (33) is provided on the second flange (30) for connecting the second air inlet gap (32) to the air supply system.

6. The meshless universal micro powder mill according to claim 5, characterized in that: The first air inlet gap (28) between the first bushing (27) and the first flange (26) gradually increases in the direction close to the crushing chamber (2), and a spiral air duct (34) is provided on the inner wall of the first bushing (27) along the axial direction.

7. The meshless universal micro powder mill according to claim 5, characterized in that: The feeding mechanism (5) includes a feeding head (35), a third motor (36), and a discharge fork wheel (37). The feeding head (35) is installed on the upper part of the first flange (26), and the first flange (26) is provided with a feeding port (38) that connects the feeding head (35) with the first air inlet gap (28). The first bushing (27) has multiple discharge holes (39) arranged in a circular array at the corresponding outward position. The discharge fork wheel (37) is located inside the feeding head (35) near the bottom outlet. The third motor (36) is located on the side of the feeding head (35), and the motor shaft of the third motor (36) extends into the feeding head (35) and is linked to the discharge fork wheel (37).

8. The meshless universal micro powder mill according to claim 7, characterized in that: The feeding mechanism (5) also includes a magnetically vibrating screen (40), which is located below the unloading fork wheel (37).

9. The meshless universal micro powder mill according to claim 8, characterized in that: The grinding chamber (2) includes a hollow grinding body (41), a movable door panel (42), and a locking assembly (43). The movable door panel (42) is hinged to the open end of the grinding body (41). The first grinding mechanism (3) and the second grinding mechanism (4) are respectively installed on the grinding body (41) and the movable door panel (42). The locking assembly (43) includes a locking pin (44) disposed on the side of the grinding body (41), and a locking screw is rotatably disposed on the locking pin (44). (45) The end of the locking screw (45) is provided with a screw handle (46). The edge of the movable door panel (42) is provided with a lock hole (47) for the locking screw (45) to be inserted. The inner side of the movable door panel (42) is provided with a conical sealing part (48). When the movable door panel (42) is fastened on the crushing body (41) and the locking screw (45) is inserted into the lock hole (47), the conical sealing part (48) on the movable door panel (42) abuts against the opening end of the crushing body (41).

10. The meshless universal micro powder mill according to claim 1, characterized in that: It also includes a filter (49) installed at the air outlet of the grinding chamber (2).

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