Airflow milling device for sintering neodymium-iron-boron permanent magnet material

Abstract

The invention discloses an airflow milling device for sintered neodymium-iron-boron permanent magnet materials, and relates to the technical field of airflow milling, the airflow milling device comprises a rotating box, the rotating box is rotationally sleeved with a circular ring frame, the circular ring frame is fixedly connected with a plurality of supporting legs, and the circular ring frame is fixedly connected with two fixing frames. Through the arrangement of the grinding unit, a compressor guides gas into a circular ring frame through a Y-shaped gas inlet pipe, then the gas enters a fixed shell through a vent hole and is sprayed out through a gas outlet hole, under the action of high-pressure gas flow, materials in a rotating box collide with one another to be ground, and a first motor is started to drive a driving shaft and a rotating gear to rotate; the rotating gear drives the circular rack, the rotating box and the fixed shell to rotate, so that materials can collide with the fixed shell, the pulverizing effect of the materials is improved, airflow sprayed out of the air outlet drives the materials to pass through the Y-shaped groove, then the narrow pipe effect can be formed, the materials can collide sufficiently, and the pulverizing effect of the materials is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of airflow milling, and in particular to an airflow milling device for sintered NdFeB permanent magnetic materials. Background Art

[0002] Sintered NdFeB permanent magnetic materials are widely used in fields such as motors and electronic devices due to their excellent magnetic properties. In the preparation process, powder milling is one of the key links, and its quality directly affects the performance of the final product.

[0003] Chinese Patent with publication number CN116273379A discloses an airflow milling device for sintered NdFeB permanent magnetic materials, including a fuselage, a compressor fixedly installed on the fuselage, a motor base fixedly installed on the right side of the fuselage, a box door hinged in front of the fuselage, a handle fixedly installed on the front of the box door, a collection box arranged on the left side of the fuselage, and a processing assembly arranged inside the fuselage. The processing assembly includes a separation mechanism fixedly installed inside the fuselage. An inlet mechanism is arranged on the separation mechanism, a screening mechanism is connected below the separation mechanism, the bottom of the connecting column is fixedly installed with a screening plate, the connecting column is made of a material that repels magnets, the bottom of the second solid column is fixedly installed with a connecting block, and the connecting block is fixedly installed with the screening plate.

[0004] Based on the above retrieval and in combination with the prior art, it is found that in the existing sintered NdFeB permanent magnets during the crushing process, due to insufficient collision between materials and the uneven shape and size of the materials, the crushing effect of the materials is poor, the particle size distribution is uneven, and a large amount of heat will be generated when the high-speed airflow collides with the materials. If not cooled in time, it may cause material oxidation or equipment damage. Summary of the Invention

[0005] The purpose of the present invention is to provide an airflow milling device for sintered NdFeB permanent magnetic materials to solve the problems raised in the above background art.

[0006] The technical solution of the present invention is: an airflow milling device for sintered NdFeB permanent magnetic materials, including a rotating box, a circular ring frame is rotatably sleeved on the rotating box, a plurality of support legs are fixedly connected to the circular ring frame, two fixed frames are fixedly connected to the circular ring frame, and further includes: A fixed cover, the fixed cover is rotatably connected to the top of the rotating box, and the tops of the two fixed frames are fixedly connected to the fixed cover; A powder milling mechanism, the powder milling mechanism is located on the rotating box; The powder making mechanism includes a grinding unit, a pre-crushing unit and a cooling unit. The grinding unit includes a plurality of fixed shells fixedly connected to the inner wall of the rotating box. A set of air outlet holes are formed in each of the plurality of fixed shells. A plurality of Y-shaped grooves are formed in the rotating box. One end of the Y-shaped groove faces the blowing direction of the air outlet hole. A Y-shaped air inlet pipe is provided on one side of the ring frame. One end of the Y-shaped air inlet pipe is fixedly communicated with the ring frame. Four ventilation holes are formed in the rotating box, and the four ventilation holes are respectively communicated with the four fixed shells. A first motor is fixedly connected to one of the support legs. The output end of the first motor is connected to a driving shaft through a coupling. A rotating gear is fixedly sleeved on the driving shaft. A ring rack is fixedly sleeved on the rotating box. The rotating gear meshes with the ring rack.

[0007] Preferably, the pre-crushing unit includes a feed pipe fixedly communicated with the top of the fixed cover. The top of the feed pipe is fixedly communicated with a crushing box. Two rotating pipes are rotatably connected to the crushing box. Crushing rollers are fixedly sleeved on both of the two rotating pipes. Transmission gears are fixedly sleeved on both of the two rotating pipes. The two transmission gears mesh with each other. A second motor is fixedly connected to the crushing box. The output end of the second motor is fixedly connected to a driving gear. The driving gear meshes with one of the transmission gears.

[0008] Preferably, a filter screen is slidably connected to the inner wall of the crushing box. A bracket is fixedly connected to the inner wall of the feed pipe. A rotating shaft is rotatably connected to the bracket. A first auger blade is fixedly sleeved on the rotating shaft. The bottom end of the rotating shaft is fixedly connected to a fixed rod. One end of the fixed rod is fixedly connected to the inner wall of the rotating box.

[0009] Preferably, two telescopic rods are fixedly connected to the inner wall of the crushing box. The top ends of the two telescopic rods are fixedly connected to the bottom of the filter screen. The top end of the rotating shaft is fixedly connected to a bevel block. An L-shaped rod is fixedly connected to the bottom of the filter screen. The bevel block contacts the L-shaped rod when rotating circumferentially.

[0010] Preferably, telescopic springs are sleeved on both of the two telescopic rods. The two ends of the telescopic spring are respectively fixedly connected to the telescopic rod and the filter screen.

[0011] Preferably, a fixed cylinder is fixedly connected to the crushing box. A second auger blade is rotatably connected to the fixed cylinder. The top end of the driving shaft is fixedly connected to the bottom end of the second auger blade. A feed channel is jointly fixedly communicated with the fixed cylinder and the crushing box. The top end of the fixed cylinder is fixedly communicated with a discharge channel. The discharge channel is located directly above the crushing box.

[0012] Preferably, the cooling unit includes an air outlet pipe fixedly communicated with the fixed cover. One end of the air outlet pipe is fixedly connected to a bag-type dust collector. One side of the bag-type dust collector away from the air outlet pipe is fixedly communicated with an L-shaped pipe. The bottom end of the L-shaped pipe is fixedly communicated with a cooling box. A pressure pump is fixedly connected to the cooling box. A connecting pipe is commonly communicated with the pressure pump and the Y-shaped air inlet pipe. The other end of the Y-shaped air inlet pipe is fixedly communicated with a fixed pipe. The top end of the fixed pipe is rotatably communicated with one end of one of the rotating pipes. One end of the other rotating pipe is rotatably communicated with a bent pipe. The other ends of the two rotating pipes are commonly rotatably communicated with a U-shaped pipe. The U-shaped pipe is fixedly connected to the pulverizing box.

[0013] Preferably, a plurality of dust removal cloths are fixedly connected to the inner wall of the bag-type dust collector. A plurality of air injection pipes are fixedly connected to the bag-type dust collector. One ends of the plurality of air injection pipes are commonly communicated with an installation pipe. The bottom end of the bent pipe is fixedly communicated with the installation pipe. A valve is installed on the installation pipe. A branch pipe is fixedly communicated with the installation pipe. A pressure valve is installed on the branch pipe.

[0014] Preferably, a discharge pipe is fixedly connected to the top of the fixed cover.

[0015] The present invention provides an airflow pulverizing device for sintered neodymium iron boron permanent magnet materials through improvement. Compared with the prior art, it has the following improvements and advantages: First: Through the setting of the pulverizing unit, the compressor introduces gas into the circular ring frame through the Y-shaped air inlet pipe, and then enters the fixed shell through the ventilation holes and is ejected from the air outlet holes. Under the action of the high-pressure air flow, the materials in the rotating box collide with each other for pulverization. Start the first motor to drive the driving shaft and the rotating gear to rotate. The rotation of the rotating gear drives the circular ring rack, the rotating box and the fixed shell to rotate, so that the materials can collide with the fixed shell, improving the pulverizing effect of the materials. Through the setting of the Y-shaped groove, the air flow ejected from the air outlet holes drives the materials through the Y-shaped groove, and then a venturi effect can be formed, enabling the materials to fully collide and improving the pulverizing effect of the materials.

[0016] Second: Through the setting of the pre-pulverizing unit of the present invention, the materials are put into the pulverizing box. Start the second motor to drive the driving gear to rotate. The rotation of the driving gear drives the two transmission gears to rotate. The rotation of the two transmission gears drives the rotating pipe and the pulverizing roller to rotate, realizing the pre-pulverization of the materials by the pulverizing roller. At the same time, the rotating box drives the fixed rod to rotate. The rotation of the fixed rod drives the rotating shaft and the first auger blade to rotate. The rotation of the first auger blade can convey the pulverized materials to the rotating box, realizing the conveying of the materials.

[0017] Thirdly: The rotating shaft of the present invention drives the bevel block to rotate. Each time the bevel block rotates one week, it drives the L-shaped rod and the filter net to move upward once. When the bevel block moves away from the L-shaped rod, the telescopic spring drives the filter net to reset, thereby being able to drive the filter net to vibrate and improving the filtering effect of the filter net; the drive shaft rotates to drive the second auger blade to rotate, so that the larger materials on the filter net enter the fixed cylinder through the discharge channel. The second auger blade rotates to drive the materials to move upward, so that the materials fall on the crushing roller through the discharge channel, realizing the secondary crushing of the materials that are not qualified for crushing.

[0018] Fourthly: Through the setting of the cooling unit in the present invention, the air flow entering the rotating box enters the bag-type dust collector through the air outlet pipe for dust removal, then enters the cooling box through the L-shaped pipe for cooling, and finally the cooled air flow enters the Y-shaped air inlet pipe through the connecting rod. Through the Y-shaped air inlet pipe for shunting, one way enters the rotating box to cool the fixed shell, and the other way enters the U-shaped pipe and two rotating pipes through the fixed pipe, thereby being able to cool the crushing roller. Close the valve of the bent pipe, so that the air flow enters the bag-type dust collector through the branch pipe and is sprayed into the bag-type dust collector by the spray pipe, thereby enabling the spray pipe to perform pulse jetting on the dust removal cloth, and thus being able to clean the dust removal cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic three-dimensional structure diagram of the whole in the present invention; Figure 2 It is a schematic three-dimensional sectional structure diagram inside the rotating box in the present invention; Figure 3 It is a schematic three-dimensional sectional structure diagram inside the crushing box in the present invention; Figure 4 It is a schematic three-dimensional structure diagram of the cooperation between the bevel block and the L-shaped rod in the present invention; Figure 5 It is a schematic sectional plane structure diagram of the cooperation between the rotating box and the circular ring frame in the present invention; Figure 6 For the present invention Figure 2 The enlarged structure diagram at A in Figure 7 It is a schematic three-dimensional structure diagram of the cooling unit in the present invention; Figure 8 It is a schematic sectional plane structure diagram inside the bag-type dust collector in the present invention.

[0021] Reference numerals: 1. Rotating box; 11. Ring frame; 12. Fixed cover; 13. First motor; 14. Driving shaft; 15. Rotating gear; 16. Ring rack; 17. Fixed frame; 18. Discharge pipe; 19. Y-shaped air inlet pipe; 110. Fixed shell; 111. Air outlet hole; 112. Y-shaped groove; 113. Ventilation hole; 2. Feed pipe; 21. Crushing box; 22. Rotating pipe; 23. Crushing roller; 24. Second motor; 25. Driving gear; 26. Transmission gear; 27. U-shaped pipe; 28. Telescopic rod; 29. Filter screen; 210. Telescopic spring; 3. Bracket; 31. Rotating shaft; 32. First auger blade; 33. Fixed rod; 34. Hypotenuse block; 35. L-shaped rod; 4. Fixed cylinder; 41. Second auger blade; 42. Feed channel; 43. Discharge channel; 5. Bag dust collector; 51. Air outlet pipe; 52. L-shaped pipe; 53. Cooling box; 54. Pressure pump; 55. Connecting pipe; 56. Fixed pipe; 57. Bent pipe; 58. Installation pipe; 59. Jet pipe; 510. Dust removal cloth; 511. Branch pipe. Detailed implementation manners

[0022] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] The present invention provides an air jet mill powder making device for sintered neodymium iron boron permanent magnet materials through improvement. The technical solution of the present invention is as follows: As Figures 1 to 8 shown, the embodiment of the present invention provides an air jet mill powder making device for sintered neodymium iron boron permanent magnet materials, including a rotating box 1. A ring frame 11 is rotatably sleeved on the rotating box 1. A plurality of support legs are fixedly connected to the ring frame 11. Two fixed frames 17 are fixedly connected to the ring frame 11. The device further includes: A fixed cover 12 is rotatably connected to the top of the rotating box 1. The tops of the two fixed frames 17 are fixedly connected to the fixed cover 12; A powder making mechanism is located on the rotating box 1; The powder making mechanism includes a powder grinding unit, a pre-crushing unit and a cooling unit. The powder grinding unit includes a plurality of fixed shells 110 fixedly connected to the inner wall of the rotating box 1. A set of air outlet holes 111 are formed in each of the plurality of fixed shells 110. A plurality of Y-shaped grooves 112 are formed in the rotating box 1. One end of the Y-shaped groove 112 faces the blowing direction of the air outlet hole 111. A Y-shaped air inlet pipe 19 is provided on one side of the ring frame 11. One end of the Y-shaped air inlet pipe 19 is fixedly communicated with the ring frame 11. Four air vent holes 113 are formed in the rotating box 1. The four air vent holes 113 are respectively communicated with the four fixed shells 110. A first motor 13 is fixedly connected to one of the support legs. The output end of the first motor 13 is connected to a drive shaft 14 through a coupling. A rotating gear 15 is fixedly sleeved on the drive shaft 14. A ring rack 16 is fixedly sleeved on the rotating box 1. The rotating gear 15 meshes with the ring rack 16. Through the setting of the powder grinding unit, the compressor introduces gas into the ring frame 11 through the Y-shaped air inlet pipe 19, and then enters the fixed shell 110 through the air vent hole 113 and is ejected from the air outlet hole 111. Under the action of the high-pressure air flow, the materials in the rotating box 1 collide with each other for crushing. Start the first motor 13 to drive the drive shaft 14 to rotate. The drive shaft 14 drives the rotating gear 15 to rotate. The rotating gear 15 rotates to drive the ring rack 16 and the rotating box 1 to rotate. The rotating box 1 rotates to drive the fixed shell 110 to rotate, so that the materials can collide with the fixed shell 110, improving the powder making effect of the materials. Through the setting of the Y-shaped groove 112, the air flow ejected from the air outlet hole 111 drives the materials through the Y-shaped groove 112, and then a venturi effect can be formed, enabling the materials to fully collide and improving the crushing effect of the materials.

[0024] Further, the pre-crushing unit includes a feed pipe 2 fixedly communicated with the top of the fixed cover 12. The top of the feed pipe 2 is fixedly communicated with a crushing box 21. Two rotating pipes 22 are rotatably connected to the crushing box 21. Crushing rollers 23 are fixedly sleeved on both of the two rotating pipes 22. Transmission gears 26 are fixedly sleeved on both of the two rotating pipes 22. The two transmission gears 26 mesh with each other. A second motor 24 is fixedly connected to the crushing box 21. The output end of the second motor 24 is fixedly connected to a driving gear 25. The driving gear 25 meshes with one of the transmission gears 26. Through the setting of the pre-crushing unit, the materials are put into the crushing box 21. Start the second motor 24 to drive the driving gear 25 to rotate. The driving gear 25 rotates to drive the two transmission gears 26 to rotate. The two transmission gears 26 rotate to drive the rotating pipes 22 and the crushing rollers 23 to rotate, realizing the pre-crushing of the materials by the crushing rollers 23.

[0025] Further, a filter screen 29 is slidably connected to the inner wall of the crushing box 21. A support 3 is fixedly connected to the inner wall of the feed pipe 2. A rotating shaft 31 is rotatably connected to the support 3. A first auger blade 32 is fixedly sleeved on the rotating shaft 31. The bottom end of the rotating shaft 31 is fixedly connected to a fixing rod 33. One end of the fixing rod 33 is fixedly connected to the inner wall of the rotating box 1. Through the arrangement of the first auger blade 32, the crushed material falls to the bottom of the crushing box 21 after being screened by the filter screen 29. The rotating box 1 drives the fixing rod 33 to rotate. The fixing rod 33 rotates to drive the rotating shaft 31 and the first auger blade 32 to rotate. The rotation of the first auger blade 32 can convey the crushed material into the rotating box 1, realizing the conveyance of the material.

[0026] Further, two telescopic rods 28 are fixedly connected to the inner wall of the crushing box 21. The top ends of the two telescopic rods 28 are fixedly connected to the bottom of the filter screen 29. The top end of the rotating shaft 31 is fixedly connected to an inclined block 34. An L-shaped rod 35 is fixedly connected to the bottom of the filter screen 29. The inclined block 34 contacts the L-shaped rod 35 during circumferential rotation. A telescopic spring 210 is sleeved on each of the two telescopic rods 28. The two ends of the telescopic spring 210 are respectively fixedly connected to the telescopic rod 28 and the filter screen 29. Through the arrangement of the inclined block 34, the rotating shaft 31 drives the inclined block 34 to rotate. The inclined block 34 drives the L-shaped rod 35 and the filter screen 29 to move upward once every rotation. When the inclined block 34 moves away from the L-shaped rod 35, the telescopic spring 210 drives the filter screen 29 to reset, thereby being able to drive the filter screen 29 to vibrate and improving the filtering effect of the filter screen 29.

[0027] Further, a fixed cylinder 4 is fixedly connected to the crushing box 21. A second auger blade 41 is rotatably connected to the fixed cylinder 4. The top end of the drive shaft 14 is fixedly connected to the bottom end of the second auger blade 41. A feed channel 42 is fixedly communicated between the fixed cylinder 4 and the crushing box 21. The top end of the fixed cylinder 4 is fixedly communicated with a discharge channel 43. The discharge channel 43 is located directly above the crushing box 21. Through the arrangement of the second auger blade 41, the drive shaft 14 rotates to drive the second auger blade 41 to rotate, so that larger materials on the filter screen 29 enter the fixed cylinder 4 through the discharge channel 43. The second auger blade 41 rotates to drive the materials to move upward, so that the materials fall on the crushing roller 23 through the discharge channel 43, realizing the secondary crushing of the materials that are not qualified for crushing.

[0028] Further, the cooling unit includes an air outlet pipe 51 fixedly connected to the fixed cover 12. One end of the air outlet pipe 51 is fixedly connected to a bag filter 5. The side of the bag filter 5 away from the air outlet pipe 51 is fixedly connected to an L-shaped pipe 52. The bottom end of the L-shaped pipe 52 is fixedly connected to a cooling box 53. A pressure pump 54 is fixedly connected to the cooling box 53. A connecting pipe 55 is commonly connected to the pressure pump 54 and the Y-shaped air inlet pipe 19. The other end of the Y-shaped air inlet pipe 19 is fixedly connected to a fixed pipe 56. The top end of the fixed pipe 56 is rotatably connected to one end of one of the rotating pipes 22. One end of the other rotating pipe 22 is rotatably connected to a bent pipe 57. The other ends of the two rotating pipes 22 are commonly rotatably connected to a U-shaped pipe 27. The U-shaped pipe 27 is fixedly connected to the crushing box 21. Through the setting of the cooling unit, the air flow entering the rotating box 1 enters the bag filter 5 through the air outlet pipe 51 for dust removal, then enters the cooling box 53 through the L-shaped pipe 52 for cooling, and finally the cooled air flow enters the Y-shaped air inlet pipe 19 through the connecting rod. The air flow is shunted through the Y-shaped air inlet pipe 19. One path enters the rotating box 1 to cool the fixed housing 110, and the other path enters the U-shaped pipe 27 and the two rotating pipes 22 through the fixed pipe 56, so as to be able to cool the crushing roller 23.

[0029] Further, a plurality of dust removal cloths 510 are fixedly connected to the inner wall of the bag filter 5. A plurality of air injection pipes 59 are fixedly connected to the bag filter 5. One ends of the plurality of air injection pipes 59 are commonly connected to an installation pipe 58. The bottom end of the bent pipe 57 is fixedly connected to the installation pipe 58. A valve is installed on the installation pipe 58. A branch pipe 511 is fixedly connected to the installation pipe 58. A pressure valve is installed on the branch pipe 511. Through the setting of the branch pipe 511, the valve of the bent pipe 57 is closed, so that the air flow is sprayed into the bag filter 5 by the air injection pipes 59 through the branch pipe 511, and then the air injection pipes 59 perform pulse air injection on the dust removal cloths 510, so as to be able to clean the dust removal cloths 510.

[0030] Further, a discharge pipe 18 is fixedly connected to the top of the fixed cover 12. Through the setting of the discharge pipe 18, the discharging of the crushed material is realized.

[0031] Specific implementation steps: The Y-shaped intake pipe 19 is connected to the compressor. The compressor introduces gas into the circular ring frame 11 through the Y-shaped intake pipe 19, and then enters the fixed shell 110 through the ventilation holes 113 and is ejected from the air outlet holes 111. Under the action of the high-pressure air flow, the materials in the rotating box 1 collide with each other for pulverization. Start the first motor 13 to drive the drive shaft 14 to rotate. The drive shaft 14 drives the rotating gear 15 to rotate. The rotation of the rotating gear 15 drives the circular ring rack 16 and the rotating box 1 to rotate. The rotation of the rotating box 1 drives the fixed shell 110 to rotate, enabling the materials to collide with the fixed shell 110, improving the powder-making effect of the materials. Through the setting of the Y-shaped groove 112, the air flow ejected from the air outlet holes 111 drives the materials to pass through the Y-shaped groove 112, and then a venturi effect can be formed, enabling the materials to fully collide and improving the pulverization effect of the materials. Put the materials into the pulverizing box 21, start the second motor 24 to drive the drive gear 25 to rotate. The rotation of the drive gear 25 drives the two transmission gears 26 to rotate. The rotation of the two transmission gears 26 drives the rotating pipe 22 and the pulverizing roller 23 to rotate, realizing the pre-pulverization of the materials by the pulverizing roller 23. The pulverized materials fall to the bottom of the pulverizing box 21 after being screened by the filter screen 29. The rotating box 1 drives the fixed rod 33 to rotate. The rotation of the fixed rod 33 drives the rotating shaft 31 and the first auger blade 32 to rotate. The rotation of the first auger blade 32 can convey the pulverized materials into the rotating box 1. The rotating shaft 31 drives the bevel block 34 to rotate. Each rotation of the bevel block 34 drives the L-shaped rod 35 and the filter screen 29 to move upward once. The movement of the filter screen 29 drives the telescopic rod 28 to stretch and contract, and at the same time drives the telescopic spring 210 to stretch and undergo elastic deformation. When the bevel block 34 moves away from the L-shaped rod 35, the telescopic spring 210 drives the filter screen 29 to reset, and then can drive the filter screen 29 to vibrate, improving the filtering effect of the filter screen 29. The rotation of the drive shaft 14 drives the second auger blade 41 to rotate, enabling the larger materials on the filter screen 29 to enter the fixed cylinder 4 through the discharge channel 43. The rotation of the second auger blade 41 drives the materials to move upward, enabling the materials to fall on the pulverizing roller 23 through the discharge channel 43, and then can perform secondary pulverization on the materials that are not pulverized qualified. The air flow entering the rotating box 1 enters the bag type dust collector 5 through the air outlet pipe 51 for dust removal, and then enters the cooling box 53 through the L-shaped pipe 52 for cooling. Finally, the cooled air flow enters the Y-shaped intake pipe 19 through the connecting rod, and is branched through the Y-shaped intake pipe 19. One way enters the rotating box 1 to cool the fixed shell 110, and the other way enters the U-shaped pipe 27 and the two rotating pipes 22 through the fixed pipe 56, and then can cool the pulverizing roller 23, and then is sprayed into the bag type dust collector 5 by the jet pipe 59 through the bent pipe 57 and the installation pipe 58. Close the valve of the bent pipe 57, so that the air flow is sprayed into the bag type dust collector 5 by the jet pipe 59 through the branch pipe 511, and then the jet pipe 59 performs pulse jetting on the dust removal cloth 510, so as to clean the dust removal cloth 510.

[0032] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air jet mill powder grinding device for sintered NdFeB permanent magnetic materials, comprising a rotating box (1), characterized in that: A circular ring frame (11) is rotatably sleeved on the rotating box (1). A plurality of support legs are fixedly connected to the circular ring frame (11). Two fixing frames (17) are fixedly connected to the circular ring frame (11). Further included are: A fixing cover (12) which is rotatably connected to the top of the rotating box (1). The tops of the two fixing frames (17) are fixedly connected to the fixing cover (12); A powder making mechanism which is located on the rotating box (1); The powder making mechanism includes a grinding unit, a pre-crushing unit and a cooling unit. The grinding unit includes a plurality of fixed shells (110) fixedly connected to the inner wall of the rotating box (1). A group of air outlet holes (111) are formed in each of the plurality of fixed shells (110). A plurality of Y-shaped grooves (112) are formed in the rotating box (1). One end of the Y-shaped groove (112) faces the blowing direction of the air outlet hole (111). A Y-shaped air inlet pipe (19) is provided on one side of the circular ring frame (11). One end of the Y-shaped air inlet pipe (19) is fixedly communicated with the circular ring frame (11). Four air vent holes (113) are formed in the rotating box (1). The four air vent holes (113) are respectively communicated with the four fixed shells (110). A first motor (13) is fixedly connected to one of the support legs. The output end of the first motor (13) is connected to a driving shaft (14) through a coupling. A rotating gear (15) is fixedly sleeved on the driving shaft (14). A circular ring rack (16) is fixedly sleeved on the rotating box (1). The rotating gear (15) meshes with the circular ring rack (16).

2. The jet mill powder grinding device for a sintered NdFeB permanent magnetic material according to claim 1, wherein: The pre-crushing unit includes a feed pipe (2) fixedly communicated with the top of the fixing cover (12). The top of the feed pipe (2) is fixedly communicated with a crushing box (21). Two rotating pipes (22) are rotatably connected to the crushing box (21). Crushing rollers (23) are fixedly sleeved on the two rotating pipes (22). Transmission gears (26) are fixedly sleeved on the two rotating pipes (22). The two transmission gears (26) mesh with each other. A second motor (24) is fixedly connected to the crushing box (21). The output end of the second motor (24) is fixedly connected to a driving gear (25). The driving gear (25) meshes with one of the transmission gears (26).

3. The jet mill powder grinding device for a sintered NdFeB permanent magnetic material according to claim 2, wherein: A filter screen (29) is slidably connected to the inner wall of the crushing box (21). A bracket (3) is fixedly connected to the inner wall of the feed pipe (2). A rotating shaft (31) is rotatably connected to the bracket (3). A first auger blade (32) is fixedly sleeved on the rotating shaft (31). The bottom end of the rotating shaft (31) is fixedly connected to a fixing rod (33). One end of the fixing rod (33) is fixedly connected to the inner wall of the rotating box (1).

4. The airflow grinding and powdering device for a sintered neodymium-iron-boron permanent magnet material according to claim 3, wherein: The inner wall of the crushing box (21) is fixedly connected with two telescopic rods (28), the tops of the two telescopic rods (28) are fixedly connected to the bottom of the filter screen (29), the top of the rotating shaft (31) is fixedly connected with a bevel block (34), the bottom of the filter screen (29) is fixedly connected with an L-shaped rod (35), and the bevel block (34) contacts the L-shaped rod (35) when rotating circumferentially.

5. The airflow milling device for sintered NdFeB permanent magnet material according to claim 4, characterized in that: Both of the two telescopic rods (28) are sleeved with telescopic springs (210), and the two ends of the telescopic springs (210) are respectively fixedly connected with the telescopic rods (28) and the filter screen (29).

6. The airflow grinding and powdering device for a sintered NdFeB permanent magnet material according to claim 4, wherein: The crushing box (21) is fixedly connected with a fixed cylinder (4), the fixed cylinder (4) is rotatably connected with a second auger blade (41), the top of the drive shaft (14) is fixedly connected to the bottom end of the second auger blade (41), the fixed cylinder (4) and the crushing box (21) are fixedly and communicatively connected with a feed channel (42), the top of the fixed cylinder (4) is fixedly and communicatively connected with a discharge channel (43), and the discharge channel (43) is located directly above the crushing box (21).

7. The airflow grinding and powdering device for a sintered neodymium-iron-boron permanent magnet material according to claim 2, wherein: The cooling unit includes an air outlet pipe (51) fixedly communicated with the fixed cover (12), one end of the air outlet pipe (51) is fixedly connected with a bag type dust collector (5), the side of the bag type dust collector (5) away from the air outlet pipe (51) is fixedly communicated with an L-shaped pipe (52), the bottom end of the L-shaped pipe (52) is fixedly communicated with a cooling box (53), the cooling box (53) is fixedly connected with a pressure pump (54), the pressure pump (54) and the Y-shaped air inlet pipe (19) are communicatively connected with a connecting pipe (55), the other end of the Y-shaped air inlet pipe (19) is fixedly communicated with a fixed pipe (56), the top end of the fixed pipe (56) is rotatably communicated with one end of one of the rotating pipes (22), one end of the other rotating pipe (22) is rotatably communicated with a bent pipe (57), and the other ends of the two rotating pipes (22) are jointly rotatably communicated with a U-shaped pipe (27), and the U-shaped pipe (27) is fixedly connected to the crushing box (21).

8. The jet mill powder grinding device for a sintered NdFeB permanent magnetic material according to claim 7, characterized in that: The inner wall of the bag type dust collector (5) is fixedly connected with a plurality of dust removal cloths (510), the bag type dust collector (5) is fixedly connected with a plurality of air jet pipes (59), one ends of the plurality of air jet pipes (59) are jointly communicated with an installation pipe (58), the bottom end of the bent pipe (57) is fixedly communicated with the installation pipe (58), a valve is installed on the installation pipe (58), and the installation pipe (58) is fixedly communicated with a branch pipe (511), and a pressure valve is installed on the branch pipe (511).

9. An airflow milling device for a sintered neodymium iron boron permanent magnet material according to any one of claims 1-8, characterized in that: The top of the fixed cover (12) is fixedly connected with a discharge pipe (18).

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