Rare earth permanent magnet material processing and impurity removing equipment

Abstract

The invention relates to the technical field of rare earth permanent magnet material impurity removal, in particular to rare earth permanent magnet material processing and impurity removal equipment which comprises a rack, a sieve plate, two material baffles, a material receiving frame, a discharge pipe, a discharge plate and the like, the top of the rack is slidably connected with the sieve plate, and the top of the sieve plate is connected with the two material baffles used for blocking rare earth permanent magnet materials; the bottom of the sieve plate is connected with a material receiving frame, the bottom of the material receiving frame is communicated with a discharging pipe, the rack is connected with a discharging plate, the screened impurities can fall into the material receiving frame, and then the impurities fall onto the discharging plate through the discharging pipe. The output shaft of the driving motor can drive the sieve plate to reciprocate left and right, impurities fall down through the sieve plate, rare earth permanent magnet materials are left on the sieve plate, and the material pushing plate pushes the rare earth permanent magnet materials on the sieve plate leftwards to push out the rare earth permanent magnet materials, so that the impurities of the rare earth permanent magnet materials can be continuously removed without pausing in the process, and the production efficiency is improved. Therefore, the working efficiency is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of impurity removal of rare earth permanent magnet materials, and particularly relates to an impurity removal device for processing rare earth permanent magnet materials. Background Art

[0002] During the processing of rare earth permanent magnet materials, impurities such as stones and soil will be generated. These impurities will affect the performance of rare earth permanent magnet materials, resulting in the failure of rare earth permanent magnet materials to meet the usage requirements. Therefore, it is necessary to remove impurities from rare earth permanent magnet materials.

[0003] Currently, the general impurity removal device uses multiple layers of vibrating sieves to remove impurities from rare earth permanent magnet materials. During the impurity removal process, the impurities fall downward into the next layer of sieve for repeated impurity removal, and the rare earth permanent magnet materials after impurity removal remain on the topmost sieve. Since the sieve is inside the device, it is necessary to open the device and then take out the rare earth permanent magnet materials after impurity removal. When taking out the rare earth permanent magnet materials after impurity removal, it is necessary to stop the machine for operation, which will delay some time in the middle and cannot continuously perform impurity removal operations, thus affecting work efficiency. Summary of the Invention

[0004] In order to overcome the drawback that it is necessary to stop the machine for operation when taking out the rare earth permanent magnet materials after impurity removal, which will delay some time in the middle and cannot continuously perform impurity removal operations, thus affecting work efficiency, the present invention provides an impurity removal device for processing rare earth permanent magnet materials.

[0005] The technical solution is: an impurity removal device for processing rare earth permanent magnet materials, including a machine frame, a sieve plate, a baffle plate, a receiving frame, a discharge pipe, a discharge plate, a first mounting plate, a conveyor, a pushing plate, a reciprocating mechanism, and a removing mechanism. The sieve plate is slidably connected to the top of the machine frame. Two baffle plates for blocking rare earth permanent magnet materials are connected to the top of the sieve plate. The receiving frame is connected to the bottom of the sieve plate. The discharge pipe is communicated with the bottom of the receiving frame. The discharge plate is connected to the machine frame. The screened impurities will fall into the receiving frame, and then the impurities will fall onto the discharge plate through the discharge pipe. Two first mounting plates are connected to the upper part of the machine frame. A conveyor is commonly mounted on the two first mounting plates. The conveyor is evenly and spacedly connected with pushing plates for pushing the rare earth permanent magnet materials on the sieve plate out. The reciprocating mechanism is used to make the sieve plate move left and right reciprocally. The removing mechanism is used to remove stones from the rare earth permanent magnet materials.

[0006] Further explanation, the reciprocating mechanism includes a vertical plate, a moving plate, a driving motor, and a crankshaft. The vertical plate is connected to the receiving frame. The moving plate is connected to the vertical plate. A strip-shaped opening is formed in the moving plate. The driving motor is connected to the machine frame. The output shaft of the driving motor is connected to the crankshaft. The crankshaft is rotatably connected to the machine frame. The crankshaft is located in the strip-shaped opening. The crankshaft can drive the moving plate to move left and right reciprocally, and the moving plate drives the receiving frame and the sieve plate to move left and right reciprocally.

[0007] Further explanation: The removing mechanism includes a second mounting plate, a conveyor belt, a magnetic attraction plate, and an aggregation hopper. Two second mounting plates are connected inside the material receiving frame. The conveyor belt and the magnetic attraction plate are installed between the two second mounting plates. The magnetic attraction plate is located inside the conveyor belt. An aggregation hopper is connected to the sieve plate. The rare earth permanent magnet materials and stones on the sieve plate fall onto the conveyor belt through the aggregation hopper. The magnetic attraction plate attracts the rare earth permanent magnet materials, and the stones fall into the material receiving frame along the conveyor belt, removing the stones in the rare earth permanent magnet materials.

[0008] Further explanation: It also includes a feeding mechanism. The feeding mechanism includes a connecting plate, a storage frame, a rotating shaft, a blocking plate, and an opening and closing assembly. Two connecting plates are connected to the first mounting plate. A storage frame is connected between the four connecting plates. The bottom of the storage frame is rotatably connected to the rotating shaft. A blocking plate for blocking the bottom of the storage frame is connected to the rotating shaft. The opening and closing assembly is used to control the opening and closing of the blocking plate.

[0009] Further explanation: The opening and closing assembly includes a gear, a sliding plate, a return spring, a rack, a contact frame, and a cam. The gear is connected to the rotating shaft. The sliding plate is slidably connected to the storage frame. The return spring is connected between the sliding plate and the storage frame. The rack is connected to the sliding plate. The rack meshes with the gear. The contact frame is connected to the sliding plate. The cam is connected to the driven shaft of the conveyor. The cam is used to push the contact frame upward. The contact frame drives the sliding plate and the rack upward. The rack drives the gear and the rotating shaft to rotate. The rotating shaft drives the blocking plate to rotate, controlling the opening and closing of the blocking plate.

[0010] Further explanation: It also includes a discharging mechanism. The discharging mechanism includes a spiral conveyor rod, a cylinder, a horizontal plate, and a convex block. The spiral conveyor rod is rotatably connected inside the material receiving frame. The cylinder is connected to the spiral conveyor rod through a one-way clutch. A spiral groove is opened on the cylinder. The horizontal plate is connected to the frame. The convex block is connected to the horizontal plate. The convex block is located inside the spiral groove.

[0011] Further explanation: It also includes a discharging frame. The discharging frame is connected to the frame. The rare earth permanent magnet materials on the conveyor belt will fall into the discharging frame and then be discharged through the discharging frame.

[0012] Further explanation: The bottom inside the storage frame is inclined.

[0013] Beneficial effects: 1. In the present invention, the output shaft of the driving motor can drive the sieve plate to reciprocate left and right. The impurities pass through the sieve plate and fall downward, and the rare earth permanent magnet materials remain on the sieve plate. The pushing plate pushes the rare earth permanent magnet materials on the sieve plate to the left, pushing out the rare earth permanent magnet materials. In this way, the rare earth permanent magnet materials can be continuously purified without pausing in the middle, thus not affecting the working efficiency.

[0014] 2. The cam can push the rack upward. The rack drives the sealing plate to rotate and open the sealing plate. The sealing plate no longer blocks the rare earth permanent magnet material, and the rare earth permanent magnet material will fall onto the sieve plate for automatic feeding, thus improving work efficiency.

[0015] 3. When the cylinder moves to the right, the cylinder will rotate and drive the spiral conveyor rod to rotate. The spiral conveyor rod can convey the impurities in the receiving frame to the right and send the impurities into the discharge pipe to prevent the impurities from remaining in the receiving frame. Brief Description of the Drawings

[0016] Figure 1 Shows the three-dimensional structural schematic diagram of the present invention.

[0017] Figure 2 Shows the three-dimensional structural schematic diagram of the sieve plate, baffle plate and receiving frame of the present invention.

[0018] Figure 3 Shows the three-dimensional structural schematic diagram of the first mounting plate, conveyor and pusher plate of the present invention.

[0019] Figure 4 Shows the three-dimensional structural schematic diagram of the reciprocating mechanism of the present invention.

[0020] Figure 5 Shows the three-dimensional structural schematic diagram of the strip-shaped opening of the present invention.

[0021] Figure 6 Shows the three-dimensional structural schematic diagram of the removing mechanism of the present invention.

[0022] Figure 7 Shows the three-dimensional structural schematic diagram of the second mounting plate and conveyor belt of the present invention.

[0023] Figure 8 Shows the three-dimensional structural schematic diagram of the magnetic attraction plate of the present invention.

[0024] Figure 9 Shows the three-dimensional structural schematic diagram of the feeding mechanism of the present invention.

[0025] Figure 10 Shows the three-dimensional structural schematic diagram of the rotating shaft, sealing plate, gear and rack of the present invention.

[0026] Figure 11 Shows the three-dimensional structural schematic diagram of the discharging mechanism of the present invention.

[0027] Figure 12 Shows the three-dimensional structural schematic diagram of the spiral groove and convex block of the present invention.

[0028] The markings of each component in the attached drawings are as follows: 1: frame, 2: sieve plate, 3: baffle plate, 4: material receiving frame, 5: discharge pipe, 6: discharge plate, 7: first mounting plate, 8: conveyor, 9: pusher plate, 10: vertical plate, 11: moving plate, 12: strip-shaped opening, 13: drive motor, 14: crankshaft, 141: second mounting plate, 142: conveyor belt, 143: magnetic attraction plate, 144: collecting hopper, 17: connecting plate, 18: storage bin, 19: rotating shaft, 20: blocking plate, 21: gear, 22: sliding plate, 23: return spring, 24: rack, 25: contact frame, 26: cam, 27: screw conveyor rod, 28: cylinder, 29: spiral groove, 30: cross plate, 31: convex block, 33: discharge frame. Detailed implementation manners

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. 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. To make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings. It is hereby declared that the directional terms such as up, down, left, right, front, back, inside and outside that appear or will appear in the present invention are only based on the accompanying drawings of the present invention, and they do not specifically limit the present invention. The serial numbers assigned to the components in this article, for example: first, second, etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And as used in this application, terms such as connection and coupling, unless otherwise specified, all include direct and indirect connection (coupling).

[0030] Embodiment 1: As Figures 1 - 8 shown, a rare earth permanent magnet material processing and impurity removal device includes a frame 1, a sieve plate 2, a baffle plate 3, a material receiving frame 4, a discharge pipe 5, a discharge plate 6, a first mounting plate 7, a conveyor 8, a pusher plate 9 and a reciprocating mechanism. The sieve plate 2 is slidably connected to the top of the frame 1. Baffle plates 3 are connected to both the front and rear sides of the top of the sieve plate 2. The material receiving frame 4 is connected to the bottom of the sieve plate 2 by bolts. The right side of the bottom of the material receiving frame 4 communicates with the discharge pipe 5. The lower right part of the frame 1 is connected to the discharge plate 6 by bolts. The discharge plate 6 is located directly below the discharge pipe 5. First mounting plates 7 are connected to both the front and rear sides of the upper part of the frame 1 by bolts. A conveyor 8 is commonly installed on the two first mounting plates 7. Pusher plates 9 are evenly spaced and connected to the conveyor 8. The reciprocating mechanism is used to make the sieve plate 2 move left and right reciprocally.

[0031] As Figure 4 and Figure 5As shown in the figure, the reciprocating mechanism includes a vertical plate 10, a moving plate 11, a driving motor 13 and a crankshaft 14. The left side of the bottom of the material receiving frame 4 is bolted to the vertical plate 10. The bottom of the vertical plate 10 is bolted to the moving plate 11. A strip-shaped opening 12 is formed in the right part of the moving plate 11. The middle part of the lower part of the frame 1 is bolted to the driving motor 13. The output shaft of the driving motor 13 is connected to the crankshaft 14 through a coupling. The upper end of the crankshaft 14 is rotatably connected to the frame 1. The crankshaft 14 is located in the strip-shaped opening 12.

[0032] As Figures 6 - 8 shown in the figure, the removing mechanism includes a second mounting plate 141, a conveyor belt 142, a magnetic attraction plate 143 and a collecting hopper 144. Two second mounting plates 141 are connected inside the material receiving frame 4. The conveyor belt 142 and the magnetic attraction plate 143 are installed between the two second mounting plates 141. The magnetic attraction plate 143 is located inside the conveyor belt 142. The collecting hopper 144 is connected to the sieve plate 2.

[0033] As Figure 6 shown in the figure, it further includes a discharging frame 33. The discharging frame 33 is connected to the left side of the frame 1.

[0034] The worker starts the driving motor 13. The output shaft of the driving motor 13 drives the crankshaft 14 to rotate. The crankshaft 14 drives the moving plate 11 to move left and right reciprocally. The moving plate 11 drives the vertical plate 10 to move left and right reciprocally. The vertical plate 10 drives the material receiving frame 4 and the sieve plate 2 to move left and right reciprocally. Pour the rare earth permanent magnet material onto the sieve plate 2. The baffle plate 3 blocks the rare earth permanent magnet material. The impurities in the rare earth permanent magnet material pass through the sieve plate 2 and fall down into the material receiving frame 4. Subsequently, the impurities fall onto the discharging plate 6 through the discharging pipe 5. Finally, the impurities are discharged along the discharging plate 6. The rare earth permanent magnet material remains on the sieve plate 2. The larger stones in the rare earth permanent magnet material also remain on the sieve plate 2. The conveyor 8 drives the pushing plate 9 to rotate. The pushing plate 9 pushes the rare earth permanent magnet material and the stones on the sieve plate 2 to the left, and pushes the rare earth permanent magnet material and the stones into the collecting hopper 144. The rare earth permanent magnet material and the stones fall onto the conveyor belt 142 along the collecting hopper 144. The magnetic attraction plate 143 attracts the rare earth permanent magnet material. The stones roll to the right along the conveyor belt 142 and fall into the material receiving frame 4. The conveyor belt 142 conveys the rare earth permanent magnet material to the left. When the rare earth permanent magnet material is away from the magnetic attraction plate 143, the magnetic attraction plate 143 no longer attracts the rare earth permanent magnet material. The rare earth permanent magnet material falls into the discharging frame 33 under the action of its own gravity. Finally, the rare earth permanent magnet material is discharged through the discharging frame 33, which is convenient for collection. The bottom inside the discharging frame 33 is inclined, which is convenient for discharging the rare earth permanent magnet material and can continuously remove impurities from the rare earth permanent magnet material without pausing in the middle, thus not affecting the working efficiency.

[0035] Embodiment 2: On the basis of Embodiment 1, as Figure 1 、 Figure 9 and Figure 10As shown in the figure, it further includes a blanking mechanism. The blanking mechanism includes a connecting plate 17, a material storage frame 18, a rotating shaft 19, a blocking plate 20, and an opening and closing assembly. On the mutually remote sides of the two first mounting plates 7, two connecting plates 17 are respectively connected by bolts. A material storage frame 18 is connected by bolts among the four connecting plates 17. The inner bottom of the material storage frame 18 is inclined. The right side of the bottom of the material storage frame 18 is rotatably connected with a rotating shaft 19. A blocking plate 20 is connected to the rotating shaft 19. The opening and closing assembly is used to control the opening and closing of the blocking plate 20.

[0036] As Figure 9 and Figure 10 shown in the figure, the opening and closing assembly includes a gear 21, a sliding plate 22, a return spring 23, a rack 24, a contact frame 25, and a cam 26. Gears 21 are respectively connected to the front and rear ends of the rotating shaft 19 by key connections. A sliding plate 22 is slidably connected to the right side of the material storage frame 18. A return spring 23 is connected between the top of the sliding plate 22 and the right side of the material storage frame 18. Racks 24 are respectively connected to the front and rear sides of the sliding plate 22 by bolts. The racks 24 are meshed with the gears 21. Contact frames 25 are respectively connected to the front and rear sides on the right side of the sliding plate 22 by bolts. Cams 26 are respectively connected to the front and rear ends of the driven shaft of the conveyor 8.

[0037] The staff pours the rare earth permanent magnet material into the material storage frame 18. The blocking plate 20 blocks the rare earth permanent magnet material. When the conveyor 8 is running, the driven shaft of the conveyor 8 drives the cam 26 to rotate. The cam 26 pushes the contact frame 25 to move upward. The contact frame 25 drives the sliding plate 22 and the rack 24 to move upward. The return spring 23 is compressed. The rack 24 drives the rotating shaft 19 to rotate. The rotating shaft 19 drives the blocking plate 20 to rotate, opening the blocking plate 20. The blocking plate 20 no longer blocks the rare earth permanent magnet material, and the rare earth permanent magnet material will fall onto the sieve plate 2 for automatic feeding, thereby improving work efficiency. The inner bottom of the material storage frame 18 is inclined, which is convenient for the discharge of the rare earth permanent magnet material in the material storage frame 18. When the cam 26 and the contact frame 25 are disengaged, under the action of the return spring 23, the sliding plate 22 and the rack 24 move downward. The rack 24 drives the rotating shaft 19 to rotate in the reverse direction. The rotating shaft 19 drives the blocking plate 20 to rotate in the reverse direction to close the blocking plate 20.

[0038] As Figure 1 , Figure 11 and Figure 12 shown in the figure, it further includes a discharging mechanism. The discharging mechanism includes a spiral conveyor rod 27, a cylinder 28, a cross plate 30, and a convex block 31. The spiral conveyor rod 27 is rotatably connected to the lower part inside the material receiving frame 4. The right end of the spiral conveyor rod 27 is connected to a cylinder 28 through a one-way clutch. A spiral groove 29 is formed on the cylinder 28. A cross plate 30 is connected to the right side of the frame 1 by bolts. The middle of the top of the cross plate 30 is connected with a convex block 31. The convex block 31 is located in the spiral groove 29.

[0039] When the material receiving frame 4 moves left and right, it will drive the spiral conveyor rod 27 and the cylinder 28 to move left and right. When the cylinder 28 moves to the right, under the action of the convex block 31, the cylinder 28 will rotate. The cylinder 28 drives the spiral conveyor rod 27 to rotate. The spiral conveyor rod 27 can convey the impurities in the material receiving frame 4 to the right and send the impurities into the discharge pipe 5, avoiding the residues of impurities in the material receiving frame 4. When the cylinder 28 moves to the left, under the action of the convex block 31, the cylinder 28 will rotate in the reverse direction. Under the action of the one-way clutch, the cylinder 28 will not drive the spiral conveyor rod 27 to rotate, avoiding the spiral conveyor rod 27 from conveying the impurities in the material receiving frame 4 to the left.

[0040] Although the present invention has been shown and described with reference to specific exemplary embodiments thereof, those skilled in the art should understand that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Therefore, the scope of the present invention should not be limited to the above embodiments, but should be determined not only by the appended claims but also by the equivalents of the appended claims. The above description is only for exemplary purposes and does not mean to limit the present invention. Those skilled in the art will understand that the variant forms of the present invention will be included within the scope of the claims herein.

Claims

1. A rare earth permanent magnet material processing and impurity removal device, including a machine frame (1), characterized in that, It also includes a sieve plate (2), a baffle plate (3), a material receiving frame (4), a discharge pipe (5), a discharge plate (6), a first mounting plate (7), a conveyor (8), a pusher plate (9), a reciprocating mechanism, and a removing mechanism. A sieve plate (2) is slidably connected to the top of the frame (1). Two baffle plates (3) for blocking rare earth permanent magnet materials are connected to the top of the sieve plate (2). A material receiving frame (4) is connected to the bottom of the sieve plate (2). The bottom of the material receiving frame (4) communicates with a discharge pipe (5). A discharge plate (6) is connected to the frame (1). The screened impurities will fall into the material receiving frame (4), and then the impurities will fall onto the discharge plate (6) through the discharge pipe (5). Two first mounting plates (7) are connected to the upper part of the frame (1). A conveyor (8) is jointly mounted on the two first mounting plates (7). Pusher plates (9) for pushing the rare earth permanent magnet materials on the sieve plate (2) are evenly spaced and connected to the conveyor (8). The reciprocating mechanism is used to make the sieve plate (2) reciprocate left and right, and the removing mechanism is used to remove stones in the rare earth permanent magnet materials.

2. The impurity removal device for processing rare earth permanent magnet materials according to claim 1 is characterized in that it reciprocates The mechanism includes a vertical plate (10), a moving plate (11), a driving motor (13), and a crankshaft (14). A vertical plate (10) is connected to the material receiving frame (4). A moving plate (11) is connected to the vertical plate (10). A strip-shaped opening (12) is formed in the moving plate (11). A driving motor (13) is connected to the frame (1). A crankshaft (14) is connected to the output shaft of the driving motor (13). The crankshaft (14) is rotatably connected to the frame (1). The crankshaft (14) is located in the strip-shaped opening (12). The crankshaft (14) can drive the moving plate (11) to reciprocate left and right, and the moving plate (11) drives the material receiving frame (4) and the sieve plate (2) to reciprocate left and right.

3. The impurity removal device for processing rare earth permanent magnet materials according to claim 2, characterized in that, The removing mechanism includes a second mounting plate (141), a conveyor belt (142), a magnetic attraction plate (143), and an aggregation hopper (144). Two second mounting plates (141) are connected inside the material receiving frame (4). A conveyor belt (142) and a magnetic attraction plate (143) are mounted between the two second mounting plates (141). The magnetic attraction plate (143) is located inside the conveyor belt (142). An aggregation hopper (144) is connected to the sieve plate (2). The rare earth permanent magnet materials and stones on the sieve plate (2) fall onto the conveyor belt (142) through the aggregation hopper (144). The magnetic attraction plate (143) attracts the rare earth permanent magnet materials, and the stones fall into the material receiving frame (4) along the conveyor belt (142), removing the stones in the rare earth permanent magnet materials.

4. The impurity removal device for processing rare earth permanent magnet materials according to claim 1 is characterized in that, It also includes a feeding mechanism. The feeding mechanism includes a connecting plate (17), a storage bin (18), a rotating shaft (19), a blocking plate (20), and an opening and closing assembly. Two connecting plates (17) are respectively connected to the first mounting plates (7). A storage bin (18) is connected between the four connecting plates (17). A rotating shaft (19) is rotatably connected to the bottom of the storage bin (18). A blocking plate (20) for blocking the bottom of the storage bin (18) is connected to the rotating shaft (19). The opening and closing assembly is used to control the opening and closing of the blocking plate (20).

5. The impurity removal device for processing rare earth permanent magnet materials according to claim 4, characterized in that, The opening and closing assembly includes a gear (21), a sliding plate (22), a return spring (23), a rack (24), a contact frame (25) and a cam (26). A gear (21) is connected to the rotating shaft (19). A sliding plate (22) is slidably connected to the storage frame (18). A return spring (23) is connected between the sliding plate (22) and the storage frame (18). A rack (24) is connected to the sliding plate (22). The rack (24) meshes with the gear (21). A contact frame (25) is connected to the sliding plate (22). A cam (26) is connected to the driven shaft of the conveyor (8). The cam (26) is used to push the contact frame (25) to move upward. The contact frame (25) drives the sliding plate (22) and the rack (24) to move upward. The rack (24) drives the gear (21) and the rotating shaft (19) to rotate. The rotating shaft (19) drives the blocking plate (20) to rotate, controlling the opening and closing of the blocking plate (20).

6. The impurity removal device for processing rare earth permanent magnet materials according to claim 1 is characterized in that, It further includes a discharging mechanism. The discharging mechanism includes a screw conveyor rod (27), a cylinder (28), a cross plate (30) and a convex block (31). A screw conveyor rod (27) is rotatably connected in the receiving frame (4). A cylinder (28) is connected to the screw conveyor rod (27) through a one-way clutch. A spiral groove (29) is formed in the cylinder (28). A cross plate (30) is connected to the frame (1). A convex block (31) is connected to the cross plate (30). The convex block (31) is located in the spiral groove (29).

7. The impurity removal device for processing rare earth permanent magnet materials according to claim 3 is characterized in that, It further includes a discharging frame (33). A discharging frame (33) is connected to the frame (1). The rare earth permanent magnet material on the conveyor belt (142) will fall into the discharging frame (33), and then the rare earth permanent magnet material is discharged through the discharging frame (33).

8. The impurity removal device for processing rare earth permanent magnet materials according to claim 4, characterized in that, The bottom inside the storage frame (18) is inclinedly arranged.

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