Preparation process of sintered neodymium-iron-boron permanent magnet without heavy rare earth

Abstract

The invention discloses a preparation process of a sintered neodymium-iron-boron permanent magnet without heavy rare earth, and belongs to the technical field of neodymium-iron-boron permanent magnet preparation, the sintered neodymium-iron-boron permanent magnet without heavy rare earth comprises a main body module and a linkage preparation module, the main body module comprises a bottom plate, and the top of the bottom plate is fixedly connected with a machining table and sintering equipment; two hollow frame plates are fixedly connected to the top of the machining table, the linkage preparation module comprises a conveying assembly arranged between the two hollow frame plates and the top of the bottom plate, the conveying assembly penetrates through the sintering equipment, and a die-casting groove is formed in the top of the machining table; through the arrangement of the conveying assembly, the pressing assembly, the pressing block, the pushing assembly, the connecting assembly, the feeding assembly, the driving assembly and the jacking assembly, continuous work can be conducted when the neodymium-iron-boron permanent magnet is prepared and sintered through the process, manual operation is greatly reduced, and therefore the whole preparation and sintering process is more automatic, and the production efficiency is improved. Therefore, the overall preparation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of NdFeB permanent magnets, and more specifically to a preparation process of heavy rare earth-free sintered NdFeB permanent magnets. Background Art

[0002] The preparation and sintering process of NdFeB permanent magnets is roughly as follows: by quantitatively feeding powder containing rare earth elements into a compacting device, the powder is made into the desired shape through processes such as pressing and molding; then the staff transfers the powder to the conveyor belt of the sintering device for transportation, and finally performs sintering heat treatment to allow the magnet to obtain good magnetic properties and other characteristics, thereby completing the preparation of NdFeB permanent magnets.

[0003] Regarding the above-mentioned related technologies, although the current existing technologies can realize the production operations of NdFeB permanent magnets, there is often a lot of time consumption between the previous independent compacting and sintering steps. For example, the operation of pouring powder, the operation of taking out the embryo after compaction, and the operation of transferring it to the conveyor belt for sintering all require manual assistance, resulting in low efficiency. Some devices can realize the automation of the above steps, but when the proportions of different elements in the NdFeB permanent magnet raw materials are different, the sintering time required is also different. When the sintering time changes, other steps are difficult to match the sintering step. In order to match the sintering time, it is usually necessary to adjust the time of feeding, compacting and taking materials separately. Otherwise, the embryo production step that is too slow will affect the production efficiency, and the embryo compaction production that is too fast will cause the embryo to accumulate and occupy space. However, it is more troublesome to adjust the parameters during feeding, compacting and taking materials separately, thereby affecting the overall preparation efficiency. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a preparation process of a heavy rare earth-free sintered NdFeB permanent magnet, which adopts the following technical solution: A preparation process of a heavy rare earth-free sintered NdFeB permanent magnet comprises the following steps: S1. Pressing step: at the beginning of the work, powder is arranged inside the die-casting tank of the preparation device, and other powder is located inside the feeding plate. The driving motor is turned on to drive the incomplete gear to rotate. The incomplete gear will first drive the connecting gear to rotate four times, so that the first shaft drives the driving disc to drive the four corner steering wheels to rotate four times by ninety degrees, so that the crankshaft rotates through the pressing rod to drive the lifting plate to perform one round of lifting and lowering, so that the pressing block performs one round of lifting and lowering, thereby realizing the pressing and forming of the powder inside the die-casting tank; S2, material pushing and conveying step: the incomplete gear is subsequently disengaged from the connecting gear and drives the transmission gear, which will drive the second shaft rod and the conveying rod to rotate, and the conveying rod will drive the metal conveyor belt to drive the embryo above it to gradually move to the inside of the sintering equipment for sintering, and the reciprocating plate will pull the T-shaped rod through the reciprocating arm to drive the sliding plate to move and reset. When the sliding plate moves, the rack drives the pinion gear, and the pinion gear will drive the bidirectional screw to rotate, so that the second connecting arm pushes the right-angled trapezoidal block to move. When the right-angled trapezoidal block moves, the roller will roll on the hypotenuse of the outer surface of the right-angled trapezoidal block. At this time, the top plate pushes the embryo to gradually rise, and the first connecting arm will push the feeding plate to move inside the movable groove. When the feeding groove is removed from the top of the die-casting groove, the top plate begins to push the embryo to rise out of the top plane of the processing table until the top of the top plate is in the same plane as the top of the processing table. The rack and the pinion gear are disengaged, so that the embryo maintains this state, and the continuous movement of the sliding plate will drive the push arm to push the embryo to let it fall onto the metal conveyor belt; S3, reset step: when the feed trough overlaps with the storage trough, the feed trough receives the powder again, and then the feed plate is reset synchronously when the reciprocating disk drives the sliding plate to reset, and the subsequent rack is connected to the right-angle trapezoidal block again to reversely drive the bidirectional screw rod to reset the top plate. When the feed plate overlaps with the die-casting trough, the powder will fall into the inside of the die-casting trough, thereby completing one round of processing. Repeating the above steps can continuously realize the processing of NdFeB permanent magnets; The preparation device in step S1 includes a main module and a linkage preparation module, the main module includes a bottom plate, the top of the bottom plate is fixedly connected to a processing table and a sintering device, and the top of the processing table is fixedly connected to two hollow frame plates; The linkage preparation module includes a conveying assembly arranged between the two hollow frames and the top of the bottom plate, the conveying assembly passes through the sintering equipment, a die-casting groove is opened on the top of the processing table, a pressing assembly is arranged between the two hollow frames, and a pressing block adapted to the die-casting groove is connected to the pressing assembly, a feeding assembly and a pushing assembly are arranged on the top of the processing table, the feeding assembly is located outside the die-casting groove, and the pushing assembly is connected to the feeding assembly, a driving assembly is arranged on one of the hollow frames, and the driving assembly is connected to the pressing assembly, a connecting assembly is arranged between the conveying assembly and the pushing assembly, and the connecting assembly is adapted to the driving assembly, a lifting assembly is arranged between the inner wall of the processing table and the inner wall of the die-casting groove, and the lifting assembly is connected to the pushing assembly.

[0005] Furthermore, the pressing assembly includes a crankshaft rotatably connected between two hollow frame plates, a pressing rod is rotatably sleeved on the outer surface of the crankshaft, a lifting plate is slidably connected between the two hollow frame plates, the pressing block is fixedly connected to the bottom of the lifting plate, the top of the lifting plate is hinged to the bottom end of the pressing rod, one end of the crankshaft is fixedly connected to four-corner steering wheels, one side of one of the hollow frame plates is rotatably connected to a first shaft rod, the outer surface of the first shaft rod is fixedly connected to a connecting gear, one end of the first shaft rod is fixedly connected to a driving disk, and the outer surface of the driving disk is movably connected to the outer surfaces of the four-corner steering wheels.

[0006] Furthermore, the pusher assembly includes a sliding plate slidably connected to the top of the processing table, a push arm is fixedly connected to the sliding plate, a T-shaped rod is fixedly connected to one side of the sliding plate, and a rack is fixedly connected to the bottom end of the T-shaped rod.

[0007] Furthermore, the lifting assembly includes a bidirectional screw rod rotatably connected between two sides of the inner wall of the processing table, one end of the bidirectional screw rod extends to the outside of the processing table and is fixedly connected to a pinion gear, the pinion gear is meshed with the rack, and the outer surface of the bidirectional screw rod is threadedly connected to two displacement blocks, and sliding grooves are provided on both sides of the inner wall of the processing table, and a right-angled trapezoidal block is slidably connected between the two sliding grooves, and a second connecting arm is hinged on the two displacement blocks, and one end of the two second connecting arms is hinged to the right-angled trapezoidal block.

[0008] Furthermore, the lifting assembly also includes a top plate movably connected to the inside of the die-casting tank, the bottom of the top plate is fixedly connected to a vertical rod, the bottom end of the vertical rod extends to the inside of the processing table, the bottom end of the vertical rod is movably connected to a roller, a return spring is fixedly connected between the outer surface of the vertical rod and the top of the inner wall of the processing table, the return spring is located outside the vertical rod, and the outer surface of the roller contacts the hypotenuse of the right-angle trapezoidal block.

[0009] Furthermore, the connecting assembly includes a second shaft rod connected to the conveying assembly, the outer surface of the second shaft rod is fixedly connected to a ratchet and a transmission gear, one side of one of the hollow frame plates is movably connected to a ratchet, one end of the ratchet is movably connected to the outer surface of the ratchet, one end of the second shaft rod is fixedly connected to a reciprocating disk, one side of the reciprocating disk is movably connected to a reciprocating arm, and one end of the reciprocating arm is movably sleeved on the outer surface of the T-shaped rod.

[0010] Furthermore, the driving assembly includes a driving motor fixedly connected to one of the hollow frames, the output shaft of the driving motor is fixedly connected to an incomplete gear, the outer surface of the incomplete gear is meshed with the connecting gear, and the outer surface of the incomplete gear is adapted to the transmission gear.

[0011] Furthermore, the conveying assembly includes two mounting seats fixedly connected to the top of the base plate, and conveying rods are rotatably connected between the two mounting seats and between the two hollow frame plates. A metal conveyor belt is transmission-connected between the outer surfaces of the two conveying rods, and the metal conveyor belt passes through the sintering equipment. The other end of the second shaft is connected to one end of one of the conveying rods.

[0012] Furthermore, the feeding assembly includes a feeding table fixedly connected to the top of the processing table, a movable groove is provided at the bottom of the feeding table, a feeding plate is movably connected between the interior of the movable groove and the top of the processing table, the feeding plate passes through another hollow frame plate, a feeding groove is provided inside the feeding plate, the feeding groove overlaps with the die-casting groove, a storage groove is provided inside the feeding table, the storage groove is connected with the movable groove, a strip groove is provided on the inner wall of the movable groove, a first connecting arm is hinged on the other side of the sliding plate, and one end of the first connecting arm is hinged to the feeding plate through the strip groove.

[0013] In summary, the present invention includes the following beneficial technical effects: (1) The present invention arranges the conveying assembly, the pressing assembly, the pressing block, the pushing assembly, the connecting assembly, the feeding assembly, the driving assembly and the lifting assembly, so that the process can work continuously when preparing and sintering the NdFeB permanent magnet, greatly reducing manual operations, thereby making the entire preparation and sintering process more automated, thereby improving the overall preparation efficiency; (2) The present invention arranges the incomplete gear, the connecting gear, the transmission gear, the rack, the first connecting arm, the feed plate and the conveying rod, so that the various processes of the manufacturing process can be coordinated with each other. When the sintering time of the embryo needs to be changed, it is only necessary to adjust the working speed of the driving motor so that the conveying speed of the metal conveyor belt will be changed, thereby changing the sintering time of the embryo staying in the sintering equipment. There is no need to adjust multiple components separately, thereby reducing the difficulty of operating the process; (3) The present invention arranges the driving plate, the four-corner steering wheels, the ratchet wheel and the ratchet teeth so that when the connecting gear and the transmission gear are not driven, the crankshaft and the reciprocating plate can be kept stable, thereby making the work more stable when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the conveying assembly of the present invention; Figure 3 It is a schematic cross-sectional structural diagram of the processing table of the present invention; Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 It is a schematic diagram of the exploded structure of the pressing component and the connecting component of the present invention; Figure 6 For the present invention Figure 5 The enlarged structural diagram at B in the middle; Figure 7 It is a schematic diagram of the structure of the driving assembly of the present invention; Figure 8 It is a schematic cross-sectional structural diagram of the feeding assembly of the present invention.

[0015] Description of the numbers in the figure: 100, main module; 110, bottom plate; 120, processing table; 130, sintering equipment; 140, hollow frame plate; 200, linkage preparation module; 210, conveying assembly; 211, mounting seat; 212, conveying rod; 213, metal conveyor belt; 220, die-casting tank; 230, pressing assembly; 231, crankshaft; 232, pressing rod; 233, lifting plate; 234, four-corner steering wheels; 235, first shaft rod; 236, driving plate; 237, connecting gear; 240, pressing block; 250, pushing assembly; 251, sliding plate; 252, pushing arm; 253, T-shaped rod; 254, rack; 260, connecting assembly; 261, second shaft rod; 262, ratchet; 2 63. ratchet; 264. transmission gear; 265. reciprocating disk; 266. reciprocating arm; 270. feeding assembly; 271. feeding table; 272. storage trough; 273. feeding plate; 274. feeding trough; 275. first connecting arm; 280. driving assembly; 281. driving motor; 282. incomplete gear; 290. lifting assembly; 291. bidirectional screw rod; 292. displacement block; 293. pinion; 294. right-angle trapezoidal block; 295. second connecting arm; 296. top plate; 297. vertical rod; 298. return spring; 299. roller. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] The following is combined with Figure 1-8 The present invention is described in further detail.

[0020] See also Figure 1-8 A process for preparing a heavy rare earth-free sintered NdFeB permanent magnet comprises the following steps: S1. Pressing step: at the beginning of the work, the die casting tank 220 of the preparation device is provided with powder material inside, and the other powder material is located inside the feeding plate 273. The driving motor 281 is turned on to drive the incomplete gear 282 to rotate. The incomplete gear 282 will first drive the connecting gear 237 to rotate four times, so that the first shaft 235 drives the driving disk 236 to drive the four-corner steering wheels 234 to rotate four times by ninety degrees, so that the crankshaft 231 rotates through the pressing rod 232 to drive the lifting plate 233 to perform one round of lifting and lowering, so that the pressing block 240 performs one round of lifting and lowering, thereby realizing the pressing and forming of the powder material inside the die casting tank 220; S2, material pushing and conveying step: the incomplete gear 282 is subsequently disengaged from the connecting gear 237 and transmits the transmission gear 264, the transmission gear 264 will drive the second shaft 261 and the conveying rod 212 to rotate, the conveying rod 212 will transmit the metal conveyor belt 213 to drive the blank above it to gradually move to the inside of the sintering device 130 for sintering, the reciprocating plate 265 will pull the T-shaped rod 253 through the reciprocating arm 266 to drive the sliding plate 251 to move and reset, when the sliding plate 251 moves, the rack 254 transmits the pinion 293, the pinion 293 will drive the bidirectional screw rod 291 to rotate, so that the second connecting arm 295 pushes the right-angle trapezoidal block 294 to move When the right-angled trapezoidal block 294 moves, the roller 299 will roll on the hypotenuse of the outer surface of the right-angled trapezoidal block 294. At this time, the top plate 296 pushes the embryo to gradually rise, and the first connecting arm 275 will push the feeding plate 273 to move inside the movable groove. When the feeding groove 274 is removed from the top of the die-casting groove 220, the top plate 296 starts to push the embryo to rise out of the top plane of the processing table 120 until the top of the top plate 296 and the top of the processing table 120 are in the same plane, and the rack 254 is separated from the pinion 293, so that the embryo remains in this state, and the continuous movement of the sliding plate 251 will drive the push arm 252 to push the embryo to let it fall onto the metal conveyor belt 213; S3, reset step: when the feed trough 274 overlaps with the storage trough 272, the feed trough 274 receives the powder again, and then the reciprocating disc 265 drives the sliding plate 251 to reset while the feed plate 273 is reset synchronously, and the subsequent rack 254 is connected to the right-angle trapezoidal block 294 again to reversely drive the bidirectional screw rod 291, so that the top plate 296 is reset, and when the feed plate 273 overlaps with the die-casting tank 220, the powder will fall into the inside of the die-casting tank 220, thereby completing one round of processing, and repeating the above steps can continuously realize the processing of NdFeB permanent magnets; The preparation device in step S1 includes a main module 100 and a linkage preparation module 200. The main module 100 includes a bottom plate 110. A processing table 120 and a sintering device 130 are fixedly connected to the top of the bottom plate 110. Two hollow frame plates 140 are fixedly connected to the top of the processing table 120. The linkage preparation module 200 includes a conveying assembly 210 arranged between two hollow frames 140 and the top of the bottom plate 110, the conveying assembly 210 runs through the sintering equipment 130, a die-casting groove 220 is opened on the top of the processing table 120, a pressing assembly 230 is arranged between the two hollow frames 140, and a pressing block 240 adapted to the die-casting groove 220 is connected to the pressing assembly 230, and a feeding assembly 270 and a pushing assembly 250 are arranged on the top of the processing table 120. The feeding assembly 270 is located at Outside the die-casting tank 220, the pushing assembly 250 is connected to the feeding assembly 270, a driving assembly 280 is provided on one of the hollow frame plates 140, and the driving assembly 280 is connected to the pressing assembly 230, a connecting assembly 260 is provided between the conveying assembly 210 and the pushing assembly 250, and the connecting assembly 260 is adapted to the driving assembly 280, and a lifting assembly 290 is provided between the inner wall of the processing table 120 and the inner wall of the die-casting tank 220, and the lifting assembly 290 is connected to the pushing assembly 250.

[0021] When in use, powder is arranged inside the die-casting tank 220, and then the staff turns on the driving assembly 280, and the driving assembly 280 will first transmit the pressing assembly 230, and the pressing assembly 230 will drive the pressing block 240 to perform a round of lifting and lowering, thereby realizing the pressing and forming of the powder inside the die-casting tank 220, and then the driving assembly 280 will transmit the connecting assembly 260, and the connecting assembly 260 will drive the pushing assembly 250 and the conveying assembly 210 to move, and the conveying assembly 210 will drive the embryo above it to gradually move to the inside of the sintering device 130 for sintering, and the sintered embryo will also be gradually moved out of the sintering device 130, and the pushing assembly 250 will transmit the feeding assembly 270 and the lifting assembly 290 when moving, and the lifting assembly 290 will gradually drive the inside of the die-casting tank 220 The embryo rises, and the feeding component 270 will be removed from the top of the die-casting tank 220. When the feeding component 270 is removed, the lifting component 290 pushes the embryo to the top of the processing table 120. The subsequent pushing component 250 is separated from the lifting component 290, so that the embryo remains in the state. The subsequent pushing component 250 will push the embryo to let it fall onto the conveying component 210. At this time, the feeding component 270 will receive the powder again, and then the connecting component 260 will drive the pushing component 250 to reset. When the pushing component 250 is reset, it will drive the feeding component 270 to reset. The subsequent pushing component 250 is connected to the lifting component 290 again and reversely drives the lifting component 290 to reset. The feeding component 270 will deliver the powder to the inside of the die-casting tank 220, thereby completing one round of processing.

[0022] The pressing assembly 230 includes a crankshaft 231 rotatably connected between two hollow frames 140, a pressing rod 232 is rotatably sleeved on the outer surface of the crankshaft 231, a lifting plate 233 is slidably connected between the two hollow frames 140, the pressing block 240 is fixedly connected to the bottom of the lifting plate 233, the top of the lifting plate 233 is hinged to the bottom end of the pressing rod 232, one end of the crankshaft 231 is fixedly connected to four-corner steering wheels 234, one side of one of the hollow frames 140 is rotatably connected to a first shaft rod 235, the outer surface of the first shaft rod 235 is fixedly connected to a connecting gear 237, one end of the first shaft rod 235 is fixedly connected to a driving disk 236, the outer surface of the driving disk 236 is movably connected to the outer surface of the four-corner steering wheels 234, and the pushing assembly The component 250 includes a sliding plate 251 slidably connected to the top of the processing table 120, a push arm 252 is fixedly connected to the sliding plate 251, a T-shaped rod 253 is fixedly connected to one side of the sliding plate 251, and a rack 254 is fixedly connected to the bottom end of the T-shaped rod 253. The lifting assembly 290 includes a bidirectional screw rod 291 rotatably connected between the two sides of the inner wall of the processing table 120, one end of the bidirectional screw rod 291 extends to the outside of the processing table 120 and is fixedly connected to a pinion 293, the pinion 293 is meshed with the rack 254, and the outer surface of the bidirectional screw rod 291 is threadedly connected to two displacement blocks 292, and both sides of the inner wall of the processing table 120 are provided with slide grooves, and a right-angle trapezoidal block 294 is slidably connected between the two slide grooves. Both displacement blocks 292 are hinged There are second connecting arms 295, one end of the two second connecting arms 295 is hinged to the right-angle trapezoidal block 294, the lifting assembly 290 also includes a top plate 296 movably connected to the inside of the die-casting tank 220, the bottom of the top plate 296 is fixedly connected to a vertical rod 297, the bottom end of the vertical rod 297 extends to the inside of the processing table 120, the bottom end of the vertical rod 297 is movably connected to a roller 299, and a return spring 298 is fixedly connected between the outer surface of the vertical rod 297 and the top of the inner wall of the processing table 120, the return spring 298 is located on the outside of the vertical rod 297, and the outer surface of the roller 299 contacts the hypotenuse of the right-angle trapezoidal block 294. The connecting assembly 260 includes a second shaft rod 261 connected to the conveying assembly 210, and the outer surface of the second shaft rod 261 is connected to the conveying assembly 210. A ratchet 262 and a transmission gear 264 are fixedly connected to the surface, a ratchet 263 is movably connected to one side of one of the hollow frames 140, one end of the ratchet 263 is movably connected to the outer surface of the ratchet 262, one end of the second shaft 261 is fixedly connected to a reciprocating disk 265, one side of the reciprocating disk 265 is movably connected to a reciprocating arm 266, one end of the reciprocating arm 266 is movably sleeved on the outer surface of the T-shaped rod 253, the driving assembly 280 includes a driving motor 281 fixedly connected to one of the hollow frames 140, the output shaft of the driving motor 281 is fixedly connected to an incomplete gear 282, the outer surface of the incomplete gear 282 is meshed with the connecting gear 237, and the outer surface of the incomplete gear 282 is adapted to the transmission gear 264.

[0023] Turn on the driving motor 281 to drive the incomplete gear 282 to rotate. The incomplete gear 282 will first drive the connecting gear 237 to rotate four times, so that the first shaft 235 drives the driving disk 236 to drive the four-corner steering wheels 234 to rotate four times of ninety degrees, so that the crankshaft 231 rotates through the pressing rod 232 to drive the lifting plate 233 to perform a round of lifting, so that the pressing block 240 performs a round of lifting, thereby realizing the pressing and forming of the powder inside the die-casting tank 220. Subsequently, the incomplete gear 282 is disengaged from the connecting gear 237 and drives the transmission gear 264. The transmission gear 264 will drive the second shaft 261 and the conveying rod 212 to rotate. At this time, the ratchet 263 moves on the outer surface of the ratchet 262, and the reciprocating disk 265 will pull the T-shaped rod 253 through the reciprocating arm 266 to drive the sliding plate 251 to move and reset. When the sliding plate 251 moves, it will drive the first connecting arm 275 and the rack 254. 254 drives the pinion 293, the pinion 293 will drive the bidirectional screw rod 291 to rotate, so that the two displacement blocks 292 will approach each other, thereby pushing the right-angled trapezoidal block 294 to move through the second connecting arm 295, when the right-angled trapezoidal block 294 moves, the roller 299 will roll on the hypotenuse of the outer surface of the right-angled trapezoidal block 294, so that the vertical rod 297 compresses the return spring 298 and drives the top plate 296 to push the embryo to gradually rise, and the first connecting arm 275 will The feed plate 273 will be pushed to move inside the movable groove. When the feed groove 274 is removed from the top of the die-casting groove 220, the top plate 296 begins to push the embryo to rise out of the top plane of the processing table 120 until the top of the top plate 296 is in the same plane as the top of the processing table 120. The rack 254 is disengaged from the pinion 293, so that the embryo remains in this state, and the continuous movement of the sliding plate 251 will drive the push arm 252 to push the embryo to let it fall onto the metal conveyor belt 213.

[0024] The conveying assembly 210 includes two mounting seats 211 fixedly connected to the top of the base plate 110, and a conveying rod 212 is rotatably connected between the two mounting seats 211 and between the two hollow frame plates 140. A metal conveying belt 213 is transmission-connected between the outer surfaces of the two conveying rods 212, and the metal conveying belt 213 passes through the sintering equipment 130. The other end of the second shaft 261 is connected to one end of one of the conveying rods 212.

[0025] The incomplete gear 282 disengages from the connecting gear 237 and transmits the transmission gear 264. The transmission gear 264 will drive the second shaft 261 and the conveying rod 212 to rotate. The conveying rod 212 will transmit the metal conveyor belt 213 to drive the embryo above it to gradually move to the inside of the sintering equipment 130 for sintering. The sintered embryo will also be gradually moved out of the sintering equipment 130.

[0026] The feeding assembly 270 includes a feeding table 271 fixedly connected to the top of the processing table 120, and a movable groove is provided at the bottom of the feeding table 271. A feeding plate 273 is movably connected between the inside of the movable groove and the top of the processing table 120, and the feeding plate 273 passes through another hollow frame plate 140. A feeding groove 274 is provided inside the feeding plate 273, and the feeding groove 274 overlaps with the die-casting groove 220. A storage groove 272 is provided inside the feeding table 271, and the storage groove 272 is connected to the movable groove. A strip groove is provided on the inner wall of the movable groove. A first connecting arm 275 is hinged on the other side of the sliding plate 251, and one end of the first connecting arm 275 is hinged to the feeding plate 273 through the strip groove.

[0027] The feeding trough 274 overlaps with the storage trough 272, so that the feeding trough 274 receives the powder again, and then the reciprocating disk 265 drives the sliding plate 251 to reset, and the feeding plate 273 is reset synchronously. Subsequently, the rack 254 is connected to the right-angle trapezoidal block 294 again to reversely drive the bidirectional screw rod 291, so that the top plate 296 is reset. When the feeding plate 273 overlaps with the die-casting groove 220, the powder will fall into the inside of the die-casting groove 220, thereby completing one round of processing. Repeating the above steps can continuously realize the processing of NdFeB permanent magnets.

[0028] The implementation principle of the embodiment of the present invention is as follows: when in use, powder is set inside the die-casting tank 220, and then the staff turns on the driving motor 281 to drive the incomplete gear 282 to rotate. The incomplete gear 282 will first drive the connecting gear 237 to rotate four times, so that the first shaft 235 drives the driving disk 236 to drive the four-corner steering wheels 234 to rotate four times by ninety degrees, so that the crankshaft 231 rotates through the pressing rod 232 to drive the lifting plate 233 to perform a round of lifting and lowering, so that the pressing block 240 performs a round of lifting and lowering, thereby realizing the pressing and forming of the powder inside the die-casting tank 220, and then the incomplete gear 282 is separated from the connecting gear 237 and drives the transmission gear 264, and the transmission gear 264 will drive the second shaft 261 The conveying roller 212 will rotate with the metal conveying belt 213, and the conveying roller 212 will drive the metal conveying belt 213 to drive the embryo above it to gradually move to the inside of the sintering device 130 for sintering. The sintered embryo will also be gradually moved out of the sintering device 130. At this time, the ratchet 263 moves on the outer surface of the ratchet wheel 262, and the reciprocating disk 265 will pull the T-shaped rod 253 through the reciprocating arm 266 to drive the sliding plate 251 to move and reset. When moving, the sliding plate 251 will drive the first connecting arm 275 and the rack 254. The rack 254 drives the pinion 293, and the pinion 293 will drive the bidirectional screw rod 291 to rotate, so that the two displacement blocks 292 will approach each other, thereby pushing the right-angle trapezoidal block 294 to move through the second connecting arm 295. When the right-angled trapezoidal block 294 moves, the roller 299 will roll on the hypotenuse of the outer surface of the right-angled trapezoidal block 294, so that the vertical rod 297 compresses the return spring 298 and drives the top plate 296 to push the embryo to gradually rise, and the first connecting arm 275 will push the feeding plate 273 to move inside the movable groove. When the feeding groove 274 is removed from the top of the die-casting groove 220, the top plate 296 begins to push the embryo to rise out of the top plane of the processing table 120 until the top of the top plate 296 is in the same plane as the top of the processing table 120. The rack 254 is separated from the pinion 293, so that the embryo maintains this state, and the continuous movement of the sliding plate 251 will drive the push arm 252 to push the embryo to let it fall onto the metal conveyor belt 213. At this time, the feeding The slot 274 will return to the inside of the feeding table 271, and the feeding slot 274 overlaps with the storage slot 272, so that the feeding slot 274 receives the powder again, and then the reciprocating disk 265 drives the sliding plate 251 to reset while the feeding plate 273 is reset synchronously, and the subsequent rack 254 is connected to the right-angle trapezoidal block 294 again to reversely drive the bidirectional screw rod 291, so that the top plate 296 is reset, and when the feeding plate 273 overlaps with the die-casting slot 220, the powder will fall into the inside of the die-casting slot 220, thereby completing one round of processing, and the above steps can be repeated to continuously realize the processing of NdFeB permanent magnets, and when it is necessary to change the sintering time of the embryo body, it is only necessary to adjust the working speed of the drive motor 281, so that the conveying speed of the metal conveyor belt 213 will be changed.Thus, the sintering time of the green body in the sintering device 130 is changed.

[0029] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A preparation process of a heavy rare earth-free sintered NdFeB permanent magnet, characterized in that: The following steps are included: S1, pressing step: at the beginning of operation, powder is arranged inside the die casting tank (220) of the preparation device, and other powder is located inside the feeding plate (273). The driving motor (281) is turned on to drive the incomplete gear (282) to rotate. The incomplete gear (282) will first drive the connecting gear (237) to rotate four times, so that the first shaft (235) drives the driving plate (236) to drive the four corner steering wheels (234) to rotate four times by ninety degrees, so that the crankshaft (231) rotates through the pressing rod (232) to drive the lifting plate (233) to perform one round of lifting and lowering, so that the pressing block (240) performs one round of lifting and lowering, thereby realizing the pressing and forming of the powder inside the die casting tank (220); S2, material pushing and conveying step: the incomplete gear (282) is subsequently disengaged from the connecting gear (237) and transmits the transmission gear (264), the transmission gear (264) will drive the second shaft (261) and the conveying rod (212) to rotate, the conveying rod (212) will transmit the metal conveyor belt (213) to drive the blank above it to gradually move to the inside of the sintering device (130) for sintering, the reciprocating disk (265) will pull the T-shaped rod (253) through the reciprocating arm (266) to drive the sliding plate (251) to move and reset, the sliding plate (251) will move when the rack (254) drives the pinion (293), the pinion (293) will drive the bidirectional screw rod (291) to rotate, so that the second connecting arm (295) pushes the right-angle trapezoidal block (29 4) moving, when the right-angled trapezoidal block (294) moves, the roller (299) will roll on the hypotenuse of the outer surface of the right-angled trapezoidal block (294), at this time, the top plate (296) will push the embryo to gradually rise, and the first connecting arm (275) will push the feeding plate (273) to move inside the movable groove. When the feeding groove (274) is removed from the top of the die-casting groove (220), the top plate (296) begins to push the embryo to rise out of the top plane of the processing table (120), until the top of the top plate (296) and the top of the processing table (120) are in the same plane, the rack (254) and the pinion (293) are disengaged, so that the embryo remains in this state, and the continuous movement of the sliding plate (251) will drive the push arm (252) to push the embryo to fall onto the metal conveyor belt (213); S3, reset step: when the feed trough (274) overlaps with the storage trough (272), the feed trough (274) receives the powder again, and then the reciprocating disc (265) drives the sliding plate (251) to reset, and the feed plate (273) is reset synchronously, and the rack (254) is connected to the right-angle trapezoidal block (294) again to reversely drive the bidirectional screw rod (291), so that the top plate (296) is reset, and when the feed plate (273) overlaps with the die-casting trough (220), the powder will fall into the inside of the die-casting trough (220), thereby completing one round of processing, and repeating the above steps can continuously realize the processing of NdFeB permanent magnets; The preparation device in step S1 comprises a main module (100) and a linkage preparation module (200), the main module (100) comprising a bottom plate (110), a processing table (120) and a sintering device (130) being fixedly connected to the top of the bottom plate (110), and two hollow frame plates (140) being fixedly connected to the top of the processing table (120); The linkage preparation module (200) comprises a conveying assembly (210) arranged between two hollow frames (140) and the top of the bottom plate (110), wherein the conveying assembly (210) passes through the sintering equipment (130), a die-casting groove (220) is provided on the top of the processing table (120), a pressing assembly (230) is provided between the two hollow frames (140), and a pressing block (240) adapted to the die-casting groove (220) is connected to the pressing assembly (230), a feeding assembly (270) and a pushing assembly (250) are provided on the top of the processing table (120), and the feeding assembly (270) is located Outside the die-casting tank (220), the pusher assembly (250) is connected to the feeding assembly (270), a driving assembly (280) is provided on one of the hollow frames (140), the driving assembly (280) is connected to the pressing assembly (230), a connecting assembly (260) is provided between the conveying assembly (210) and the pusher assembly (250), the connecting assembly (260) is adapted to the driving assembly (280), a lifting assembly (290) is provided between the inner wall of the processing table (120) and the inner wall of the die-casting tank (220), the lifting assembly (290) is connected to the pusher assembly (250).

2. The process for preparing a heavy rare earth-free sintered NdFeB permanent magnet according to claim 1, characterized in that: The pressing assembly (230) comprises a crankshaft (231) rotatably connected between two hollow frames (140); a pressing rod (232) is rotatably sleeved on the outer surface of the crankshaft (231); a lifting plate (233) is slidably connected between the two hollow frames (140); the pressing block (240) is fixedly connected to the bottom of the lifting plate (233); the top of the lifting plate (233) is hinged to the bottom end of the pressing rod (232); one end of the crankshaft (231) is fixedly connected to four-corner steering wheels (234); one side of one of the hollow frames (140) is rotatably connected to a first shaft rod (235); the outer surface of the first shaft rod (235) is fixedly connected to a connecting gear (237); one end of the first shaft rod (235) is fixedly connected to a driving disk (236); the outer surface of the driving disk (236) is movably connected to the outer surface of the four-corner steering wheels (234).

3. The process for preparing a heavy rare earth-free sintered NdFeB permanent magnet according to claim 2, characterized in that: The pusher assembly (250) comprises a sliding plate (251) slidably connected to the top of the processing table (120), a pusher arm (252) being fixedly connected to the sliding plate (251), a T-shaped rod (253) being fixedly connected to one side of the sliding plate (251), and a rack (254) being fixedly connected to the bottom end of the T-shaped rod (253).

4. The process for preparing a heavy rare earth-free sintered NdFeB permanent magnet according to claim 3, characterized in that: The lifting assembly (290) comprises a bidirectional screw rod (291) rotatably connected between two sides of the inner wall of the processing table (120), one end of the bidirectional screw rod (291) extends to the outside of the processing table (120) and is fixedly connected to a pinion gear (293), the pinion gear (293) is meshed with a rack gear (254), the outer surface of the bidirectional screw rod (291) is threadedly connected to two displacement blocks (292), both sides of the inner wall of the processing table (120) are provided with a slide groove, a right-angled trapezoidal block (294) is slidably connected between the two slide grooves, and the two displacement blocks (292) are hinged with a second connecting arm (295), and one end of the two second connecting arms (295) is hinged to the right-angled trapezoidal block (294).

5. The process for preparing a heavy rare earth-free sintered NdFeB permanent magnet according to claim 4, characterized in that: The lifting assembly (290) also includes a top plate (296) movably connected to the inside of the die-casting tank (220), the bottom of the top plate (296) is fixedly connected to a vertical rod (297), the bottom end of the vertical rod (297) extends to the inside of the processing table (120), the bottom end of the vertical rod (297) is movably connected to a roller (299), and a return spring (298) is fixedly connected between the outer surface of the vertical rod (297) and the top of the inner wall of the processing table (120), the return spring (298) is located outside the vertical rod (297), and the outer surface of the roller (299) contacts the hypotenuse of the right-angle trapezoidal block (294).

6. The process for preparing a heavy rare earth-free sintered NdFeB permanent magnet according to claim 5, characterized in that: The connection assembly (260) comprises a second shaft (261) connected to the conveying assembly (210); the outer surface of the second shaft (261) is fixedly connected to a ratchet (262) and a transmission gear (264); one side of one of the hollow frames (140) is movably connected to a ratchet (263); one end of the ratchet (263) is movably connected to the outer surface of the ratchet (262); one end of the second shaft (261) is fixedly connected to a reciprocating disk (265); one side of the reciprocating disk (265) is movably connected to a reciprocating arm (266); one end of the reciprocating arm (266) is movably sleeved on the outer surface of the T-shaped rod (253).

7. The process for preparing a heavy rare earth-free sintered NdFeB permanent magnet according to claim 6, characterized in that: The driving assembly (280) comprises a driving motor (281) fixedly connected to one of the hollow frame plates (140); an output shaft of the driving motor (281) is fixedly connected to an incomplete gear (282); an outer surface of the incomplete gear (282) meshes with the connecting gear (237), and an outer surface of the incomplete gear (282) matches the transmission gear (264).

8. The process for preparing a heavy rare earth-free sintered NdFeB permanent magnet according to claim 7, characterized in that: The conveying assembly (210) comprises two mounting seats (211) both fixedly connected to the top of the bottom plate (110); a conveying rod (212) is rotatably connected between the two mounting seats (211) and between the two hollow frame plates (140); a metal conveying belt (213) is drivingly connected between the outer surfaces of the two conveying rods (212); the metal conveying belt (213) passes through the sintering equipment (130); and the other end of the second shaft (261) is connected to one end of one of the conveying rods (212).

9. The process for preparing a heavy rare earth-free sintered NdFeB permanent magnet according to claim 8, characterized in that: The feeding assembly (270) comprises a feeding table (271) fixedly connected to the top of the processing table (120), a movable groove is provided at the bottom of the feeding table (271), a feeding plate (273) is movably connected between the inside of the movable groove and the top of the processing table (120), the feeding plate (273) passes through another hollow frame plate (140), a feeding groove (274) is provided inside the feeding plate (273), the feeding groove (274) overlaps with the die-casting groove (220), a storage groove (272) is provided inside the feeding table (271), the storage groove (272) is connected to the movable groove, a strip groove is provided on the inner wall of the movable groove, a first connecting arm (275) is hinged on the other side of the sliding plate (251), one end of the first connecting arm (275) is hinged to the feeding plate (273) through the strip groove.

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