Method and device for recovering magnets from rotors

Abstract

Multiple rotors can be processed continuously to recover magnets, reducing the workload. [Solution] A method for recovering magnets from a rotor having multiple stacked steel plates and magnets fixed in holes in the steel plates, comprising a heating process in which the rotor is heated to demagnetize the magnets and embrittle the resin used to fix the magnets, a quenching process in which the rotor is rapidly cooled after the heating process, and a vibration transport process in which the rotor after quenching is transported while being subjected to vibrations and impacts. In the vibration transport process, forces are applied to the steel plates and magnets in the vertical and horizontal directions along the transport surface by vibration.

Description

[Technical field]

[0001] The present invention relates to a magnet recovery method and a magnet recovery device for recovering magnets from rotors of used automobile motors and the like.

[0002] In recent years, the number of xEVs (electric vehicles), including electric vehicles (EVs) and hybrid electric vehicles (HEVs), has been increasing. xEVs are equipped with large drive motors, the rotors of which use many rare earth magnets, which have a high procurement risk, and reliable recycling is required. As xEVs become more powerful and powerful, their drive motors have also become larger and more robust in structure, which makes dismantling them and recovering the magnets more of a workload and inefficient.

[0003] Until now, the common method has been to heat the rotor to high temperatures to demagnetize the magnets and embrittle the resin that holds the magnets in place, then cool the rotor to a workable temperature and vibrate or impact the rotor and magnets to separate and recover the magnets from the steel plate.

[0004] For example, Patent Document 1 discloses a rotor core having a horizontally arranged shaft and a vibrator that vibrates the shaft vertically. The shaft is passed through a through hole in the rotor core, and the rotor core is supported with a sufficient gap between the outer peripheral surface of the shaft below the shaft and the inner peripheral surface of the rotor core. The shaft is vibrated vertically using the vibrator, thereby applying vertical vibrations to the rotor core and causing continuous collisions between the outer peripheral surface of the shaft and the inner peripheral surface of the rotor core.

[0005] Patent Document 2 discloses a method for recovering magnets from a rotor in which multiple annular steel plates are joined together and magnets are inserted into holes and fixed with adhesive, in which the rotor is heated to the higher of either the Curie temperature or the incineration temperature of the adhesive to demagnetize the magnets and embrittle the adhesive, and then vibrations that resonate with the steel plates on the end faces of the rotor are applied to remove the adhesive and magnets from the holes. It is described that an air hammer is used as a means for applying vibrations. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2011-166966 A [Patent Document 2] JP 2015-216777 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, in recent motors (rotors), the magnet-fixing resin is often not sufficiently embrittled by heating alone, and the magnets cannot be separated by impact alone, so in such cases it is necessary to peel off the stacked steel plates one by one to recover only the magnets, which is very inefficient and requires a high workload. Also, the method disclosed in Patent Document 1 requires complicated handling, such as passing the rotors through the shaft one by one, which is a high workload and unsuitable for mass processing.

[0008] The present invention has been made in view of the above circumstances, and has an object to reduce the workload by continuously processing a plurality of rotors and recovering magnets. [Means for solving the problem]

[0009] The method for recovering magnets from a rotor of the present invention is a method for recovering the magnets from a rotor having a plurality of laminated steel plates and magnets fixed in holes in the steel plates, the method comprising the steps of: The method includes a heating step of heating the rotor to demagnetize the magnets and embrittle the magnet fixing resin, a quenching step of quenching the rotor after the heating step, and a vibration conveying step of conveying the quenched rotor while applying vibrations and impacts to the rotor, In the vibration conveying step, a force is applied to the steel plate and the magnet in the vertical direction and in the direction along the conveying surface by vibration.

[0010] This magnet recovery method involves a heating process to demagnetize the magnets and embrittle the resin, then a quenching process to create a temperature difference between the outer surface and center of the rotor, and utilizing the difference in thermal expansion and contraction between the skin side and center of the laminated steel plates and between the steel plates and the resin to deform and peel off the laminated steel plates.Then, in the vibration conveying process, a force is applied to the steel plates in a direction along the conveying surface to convey the steel plates and magnets, which makes it possible to convey them efficiently by applying vibration.

[0011] In the rotor magnet recovery method of the present invention, the vibration transport step may include vibrating the transport surface in an oblique direction. By vibrating in an oblique direction, a diagonal force (component forces act in the vertical direction and along the conveying surface) is applied to the rotor, making it possible to peel off the steel plate and separate and convey the magnets.

[0012] In the rotor magnet recovery method of the present invention, the vibration transport step may be such that the transport surface is inclined downward in the transport direction. By inclining the conveying surface, a force is applied to the steel plate in the planar direction by vibration without intentionally applying an external force in the horizontal direction, which makes it possible and efficient to convey the steel plate.

[0013] The rotor magnet recovery device of the present invention is a device for recovering magnets from a rotor having a plurality of laminated steel plates and magnets fixed in holes of the steel plates, the device comprising: The magnet fixing method includes a heating means for heating the rotor to a temperature equal to or higher than the Curie temperature or the brittle temperature of the magnet fixing resin, a quenching means for quenching the rotor heated by the heating means, and a vibration conveying means for conveying the quenched rotor while applying vibrations and impacts thereto, The vibration conveying means has vibration applying means for applying a force to the steel plate in a vertical direction and in a direction along the conveying surface.

[0014] In the rotor magnet recovery device of the present invention, the vibration applying means may vibrate the transport surface in an oblique direction.

[0015] In the rotor magnet recovery device of the present invention, the transport surface may be inclined downward in the transport direction. Effect of the Invention

[0016] According to the present invention, the series of operations of heating, rapid cooling, and vibration transport can be carried out continuously, allowing multiple rotors to be processed continuously and magnets to be efficiently recovered. Moreover, the steel plate peels off during vibration transport and the magnets are separated without human intervention, reducing the workload. [Brief description of the drawings]

[0017] [Figure 1] 1 is a plan view showing an example of a rotor handled by a magnet recovery device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a longitudinal sectional view of the rotor of FIG. [Diagram 3] FIG. 2 is a configuration diagram of a magnet recovery device according to an embodiment. [Figure 4] FIG. 2 is a perspective view showing an example of a vibration transport means in the magnet recovery device of the embodiment. [Diagram 5] FIG. 5 is a side view of the vibration conveying means of FIG. [Figure 6] 4 is a flowchart illustrating a magnet recovery method according to one embodiment. [Figure 7] FIG. 2 is a perspective view showing a vibration transport step in the magnet recovery method. [Figure 8] FIG. 6 is a side view similar to FIG. 5, showing a first modified example of the vibration conveying means. [Figure 9] 6 is a side view similar to FIG. 5, showing a second modified example of the vibration conveying means. FIG. [Figure 10] FIG. 7 is a side view similar to FIG. 5, showing a third modified example of the vibration conveying means. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, the rotor will be described. As shown in Figures 1 and 2, rotor 1 is formed into an overall cylindrical shape by joining a plurality of annular steel plates 2 made of magnetic material in a stacked state by crimping or the like. A plurality of holes 3 are formed in each steel plate 2 at intervals in the circumferential direction, and the steel plates 2 are stacked in a state in which the holes 3 communicate with each other in the axial direction. Magnets 4 are fixed in the holes 3 in a communicating state by magnet fixing resin 5. The steel plate 2 is preferably a silicon steel plate having a thickness of, for example, 0.35 mm, the magnet 4 is preferably a rare earth magnet such as neodymium, and the magnet fixing resin 5 is preferably an epoxy resin.

[0019] <One embodiment> A magnet recovery device and a magnet recovery method according to an embodiment of the present invention will be described. As shown in FIG. 3, this magnet recovery device 10 has a heating means 11 for heating the rotor 1, a quenching means 12 for quenching the rotor 1 heated by the heating means 11, and a vibration conveying means 13 for conveying the rotor 1 after quenching while applying vibrations and impacts thereto.

[0020] A heating furnace is used as the heating means 11, and by heating the rotor to the higher of the Curie temperature or the embrittlement temperature of the magnet fixing resin, the magnets 4 in the rotor 1 are demagnetized and the magnet fixing resin 5 is embrittled. For example, a water tank is used as the cooling means 12, and the rotor 1 removed from the heating means (heating furnace) 11 is cooled by submerging it in water or the like. A shower in which water or the like is sprayed onto the rotor 1 may also be used. Other possible cooling means include immersing the rotor in a device filled with a coolant other than water, or spraying water onto the rotor 1 while blowing air onto the rotor.

[0021] As shown in Figures 4 and 5, the vibration conveying means 13 includes a conveying path 23 formed by a screen 21 of a predetermined length on which the rotor 1 is placed and conveyed, and side walls 22 erected on both sides of the screen 21, and a vibration imparting means 24 that vibrates the conveying path 23. The screen 21 is composed of a perforated plate such as punched metal having a large number of through holes 25 formed therein. The through holes 25 are formed to a size that does not allow the steel plate 2 of the rotor 1 to pass therethrough, but allows the magnets 4 and magnet fixing resin 5 in the rotor 1 to pass therethrough. Side walls 22 are erected on both sides of the screen 21, and the screen 21 and the side walls 22 together form a trough structure having a bottom and side surfaces, or a gutter-shaped transport path 23.

[0022] In this embodiment, the vibration applying means 24 applies vibration and impact to the trough-structured transport path 23 while supporting it on a horizontal base 31, and a vibration motor 33 with a rotation shaft 32 facing obliquely is attached to the outer surface of the side wall 22 of the transport path 23, and vibration and impact are applied obliquely to the transport path 23, in other words, the screen 21, by the rotation of this vibration motor 33. The attachment location of the vibration motor 33 is not limited to the outer surface of the side wall 22, and may be the underside of the transport path 23 as long as it is possible to apply vibration and impact to the screen 21 obliquely. In order to prevent the vibration of the screen 21 from being transmitted to the base 31, an elastic member 34 is interposed between the base 31 and the transport path 23 along the vertical direction.

[0023] The vibration motor 33 has a weight eccentrically mounted on the rotating shaft 32, and the rotation of the eccentric weight can apply vibration and impact in a direction perpendicular to the rotating shaft 32. Since the vibration motor 33 is mounted on the outer surface of the side wall 22 with the rotating shaft 32 facing in an oblique direction, it is possible to apply vibration and impact to the side wall 22 in an oblique direction. As a result of this vibration, the transport path 23 vibrates diagonally, and vibrations and impacts are imparted to the rotor 1 on the screen 21 by a component of force mainly along the thickness direction (vertical direction) of the screen 21, and the rotor 1 on the screen 21 is transported by a component of force along the surface direction (horizontal direction) of the screen 21.

[0024] In this case, in order to facilitate disassembly and separation of the rotor 1, it is preferable to set the frequency and amplitude of the vibration applied to the screen 21 as large as possible. By changing the mounting angle of the vibration motor attached to the outer surface of the side wall 22, it is possible to change the component forces in the thickness direction (vertical direction) of the screen 21 and the surface direction (horizontal direction) of the screen 21, thereby adjusting the vibration and impact applied to the rotor 1 on the screen 21 and the transport action of the rotor 1. In addition, a plurality of baffle plates 35 are provided to protrude from the inside of the side wall 22. These baffle plates 35 protrude in an inclined state toward the center of the width direction of the screen 21 and toward the downstream in the transport direction, and a plurality of them are provided at predetermined intervals in the transport direction. In FIG. 4, reference numeral 36 denotes a steel plate discharge port at the downstream end of the conveying path 23 , and reference numeral 37 denotes a box for receiving the steel plates 2 falling from the conveying path 23 .

[0025] A method for recovering magnets 4 from rotor 1 using magnet recovery device 10 configured as above will be described. As shown in FIG. 6, this magnet recovery method includes a heating process in which the rotor 1 is heated by a heating means 11 to demagnetize the magnets 4 and embrittle the magnet fixing resin 5, a quenching process in which the rotor 1 is quenched by a quenching means 12 after the heating process, and a vibration conveying process in which the rotor 1 after quenching is placed into a vibration conveying means 13 and conveyed while being subjected to vibration and impact. The steps will be explained below in order.

[0026] (Heating process) As mentioned above, in the heating process, the rotor 1 is heated to the higher of the Curie temperature or the embrittlement temperature of the magnet fixing resin; in the case of a neodymium magnet, it is demagnetized by holding it at a temperature of 380°C or higher for about 15 minutes, which is higher than its Curie temperature (330°C to 380°C). Although embrittlement of the magnet fixing resin depends on the type of resin, decomposition and embrittlement usually progresses when the magnet is heated to a temperature higher than the Curie temperature of the magnet, so it is sufficient to set the temperature to promote demagnetization of the magnets 4 and embrittlement of the magnet fixing resin 5.

[0027] (Quenching process) In the quenching process, the rotor 1, which has reached a high temperature in the heating process, is quenched with water or the like. This quenching creates a difference between the skin temperature and the core temperature of the rotor 1, and the laminated steel plates 2 are deformed and peeled off due to the difference in thermal expansion and contraction between the skin side and the center of the laminated steel plates, and between the steel plates 2 and the resin, etc. As other cooling means, as mentioned above, there are immersing the rotor in liquid nitrogen, spraying liquid nitrogen, immersing the rotor in a device filled with another refrigerant, spraying water while blowing air, etc. Then, as the steel plate 2 peels off, the magnet fixing resin 5 is crushed, and the magnets 4 fixed to the steel plate 2 can provide gaps in the holes 3 of the steel plate 2. At this stage, some of the magnets 4 may fall off near the outer surface of the rotor 1, but most of them are trapped inside the rotor 1.

[0028] (Vibration conveying process) In the vibration conveying step, the rotor 1 is placed on the screen 21 of the conveying path 23 while the screen 21 of the vibration conveying means is subjected to vibration and impact by the vibration applying means 24. Since the screen 21 is subjected to vibration obliquely, the rotor 1 moves in the surface direction of the screen 21 while vibrating on the screen 21. At this time, the frequency of the vibration applied by the vibration applying means 24 is set to be relatively high and the amplitude is set to be large so that the rotor 1 can be subjected to impact as well as vibration.

[0029] The vibrations and impacts applied to the rotor 1 by the screen 21 promote the peeling of the steel plates 2, and as shown diagrammatically in Figure 7, the magnet fixing resin 5, which was embrittled in the previous process, collapses and the magnets 4 are separated from the steel plates 2. The steel plates 2 are stacked in multiple sheets, and the magnets 4 were fixed in the holes 5 of each of the multiple steel plates 2, but the peeled steel plates 2 shift in the planar direction due to the diagonal vibration and impact, and the magnets 4 fixed inside also fall out of the holes 5 as the steel plates 2 shift. Furthermore, the peeled steel sheets 2 collide with each other due to vibration and impact during the transport process, accelerating the peeling of the individual steel sheets 2 and the separation of the magnets 4. After peeling, the steel sheets 2 are more susceptible to the vibration and impact applied by the screen 21 than before peeling, accelerating the falling off of the magnets 4.

[0030] Then, the magnets 4 and magnet fixing resin 5 that have separated and fallen off from the steel plate 2 pass through the through holes 25 formed in the screen 21 and drop below the screen 21 while being transported on the screen 21. On the other hand, since the steel plate 2 is larger than the through holes 25, it is transported on the screen 21 and sent downstream, drops from the steel plate discharge port 36, and only the steel plate 2 can be collected in a box 37. In this case, a number of baffle plates 35 are provided protruding from the inside of the side wall 22, so that when the rotor 1 or the steel plate 2 approaches either side of the screen 21 in the width direction, the baffle plates 35 move the rotor 1 or the steel plate 2 toward the center of the screen 21 in the width direction, and appropriate vibration and impact are applied to the rotor 1 or the steel plate 2.

[0031] As mentioned above, in the rapid cooling process which is the process preceding this vibration conveying process, the steel plate 2 peels off. In this vibration conveying process, vibrations and impacts are applied to the steel plate 2, etc., so that the steel plate 2 peels off and the magnets 4 become easily detached from the steel plate 2. It is more preferable to drop the rotor 1 from above when feeding the rotor 1 onto the screen 21 of the transport path 23, since a large impact force can be applied to the rotor 1. It is also more preferable to change the dropping surface to a plate equipped with protrusions, since this promotes peeling of the steel plate 2.

[0032] In this manner, the magnets 4 in the rotor 1 can be separated from the steel plates 2 and recovered. In this case, the rotor 1, which has been demagnetized and the resin embrittled by heating and quenching, is subjected to vibration and impact while being transported, and the rotor 1 is disassembled, and the steel plates 2 peel off. Since the vibration and impact are applied in an oblique direction, they act not only vertically but also horizontally, allowing the rotor 1 to move (transport) in the planar direction, during which the peeled steel plates 2 are transported while shifting relative to each other in the planar direction, making it easier for the magnets 4 held by the stacked steel plates 2 to come off from the holes 5 in the steel plates 2. In this way, the vibration conveying process is efficient in that it allows the peeling of the steel plate 2 and the separation of the magnets 4 to be performed simultaneously while conveying. The detached magnets 4 drop from the through-holes 25 of the screen 21, and can be recovered separately from the steel plate 2.

[0033] <Modification of vibration conveying means> Three modified examples of the vibration conveying means are described below. In each of the modified examples, the conveying path (screen 21 and side wall 22) 23, the base 31, etc. of the vibration conveying means are the same as those in the first embodiment, but the configuration of a part of the vibration applying means is different from that in the first embodiment.

[0034] [First Modification] As shown in Fig. 8, the vibration conveying means 40 of the first modification includes a vibration applying means 41 including a motor 42 provided on the base 31 and a crank mechanism 44 connected to a rotating shaft 43 of the motor 42. In this case, the motor 42 is provided horizontally with the rotating shaft 43 facing both sides of the screen 21, and the crank mechanism 44 is provided with a driven rotating shaft 45 rotatably supported on the base 31 on the side of the motor 42, and one end of a connecting rod 46 is eccentrically held by the driven rotating shaft 45, and the tip of the connecting rod 46 is supported by the side wall 22 of the conveying path 23. In this case, the connecting rod 46 is attached to the side wall 22 of the conveying path 23 at an angle with respect to the horizontal direction of the screen 21, and the tip is held by the side wall 22 so as to be swingable. In other words, the tip of the connecting rod 46 does not move in the length direction relative to the side wall 22, but is held so as to be swingable around the tip.

[0035] In addition, the elastic member 14 such as a spring interposed between the conveying path 23 and the base 31 is arranged at an angle in approximately the same direction as the connecting rod 46, and in order to hold the elastic member 14 and the connecting rod 46 in the diagonal direction, the conveying path 23 and the base 31 are connected by a connecting link 47.

[0036] In this vibration conveying means 40, when the motor 42 of the vibration applying means 41 rotates, the rotation rotates the driven rotary shaft 45, and the base end of the connecting rod 46 eccentrically connected to the driven rotary shaft 45 rotates, causing the connecting rod 46 to swing at the tip end thereof and vibrate the side wall 22 obliquely. As a result, vibration and impact are applied obliquely to the screen 21. The elastic member 14 such as a spring resonates with the vibrating conveying path 23, making the amplitude larger. In addition, the vibration of the conveying path 23 is suppressed from being transmitted to the base 31.

[0037] [Second modified example] 9, in the vibration conveying means 50 of the second modified example, vibration applying means 51 includes a motor 52 provided on the outer surface of the side wall 22 and an eccentric weight 53 rotated by the motor 52. In this case as well, the rotation shaft 54 ​​of the motor 52 is provided horizontally toward both sides of the screen 21, and the eccentric weight 53 is provided eccentrically with respect to a horizontal driven rotation shaft 55 rotated by the motor 52. Both the motor 52 and the eccentric weight 53 are attached to the outer surface of the side wall 22 of the conveying path 23, and vibration and impact are applied to the conveying path 23 by the rotation of the eccentric weight 53. As in the first modification, an elastic member 14 is interposed between the transport path 23 and the base 31 in an oblique direction, and in order to hold the elastic member 14 in an oblique direction, the transport path 23 and the base 31 are connected by a connecting link 47. The elastic member 14, such as a spring, resonates with the vibrating transport path 23, increasing the amplitude. In addition, the transmission of vibrations of the transport path 23 to the base 31 is suppressed.

[0038] In this vibration conveying means 50, when the motor 52 of the vibration applying means 51 rotates, the rotation rotates the eccentric weight 53. Since the conveying path 23 is supported by the elastic member 14 and the connecting link 47 so as to be movable in an oblique direction, the rotational movement of the eccentric weight 53 applies vibration and impact to the conveying path 23 obliquely.

[0039] [Third Modification] As shown in FIG. 10, the vibration conveying means 60 of the third modified example is similar to the first and second modified examples in that the vibration imparting means 61 has an oblique elastic member 14 and a connecting link 47 provided between the base 31 and the conveying path 23, but differs in that the conveying path 23 is driven by a fluid pressure cylinder 62 of air or liquid attached to the base 31. This cylinder 62 is provided between the conveying path 23 and the base 31 in the same oblique direction as the elastic member 14, and the tip of its cylinder rod 63 is fixed to the side wall 22 of the conveying path 23. The cylinder 62 is configured to impart vibration and impact by reciprocating along the conveying path 23 in an oblique direction.

[0040] In any of the above modified examples, by vibrating the conveying path 23 in an oblique direction, as in the first embodiment, a series of operations can be efficiently performed, in which vibration and impact are applied obliquely to the screen 21, causing the steel plate 2 of the rotor 1 to peel off and the magnets 4 to separate while being conveyed, and the magnets 4 and the steel plate 2 are separated and recovered through the screen 21 having the through holes 25.

[0041] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. For example, in all of the vibration applying means, the screen 21 was arranged horizontally, but the screen itself may be arranged at a downward gradient toward the downstream of the conveying direction from the horizontal direction. In that case, the vibration and impact may be applied in the vertical direction instead of in the diagonal direction. In short, it is sufficient that the configuration is such that when vibration and impact are applied to the screen 21, a force is applied to the steel plate 2 in the surface direction of the screen 21 (the conveying direction). [Explanation of symbols]

[0042] 1 rotor 2 steel plate 3 holes 4. Magnets 5 Resin for fixing magnets 10. Magnet recovery device 11 Heating means 12 Rapid cooling method 13 Vibration conveying means 21 Screens 22 Side wall 23 Transport Path 24 Vibration applying means 25 Through hole 31 Base 32 Rotation axis 33 Vibration Motor 34 Elastic member 35 Baffle Board 36 Steel plate outlet 37 boxes 40 Vibration conveying means 41 Vibration applying means 42 Motor 43 Rotational Axis 44 Crank mechanism 45 Driven Rotary Shaft 46 Connecting rod 47 Links 50 Vibration conveying means 51 Vibration applying means 52 Motor 53 Eccentric weight 54 Rotation axis 55 Driven rotating shaft 60 Vibration conveying means 61 Vibration applying means 62 cylinders 63 Cylinder rod

Claims

1. A method for recovering magnets from a rotor having a plurality of stacked steel plates and magnets fixed in holes in the steel plates, comprising the steps of: The method includes a heating step of heating the rotor to demagnetize the magnets and embrittle the magnet fixing resin, a quenching step of quenching the rotor after the heating step, and a vibration conveying step of conveying the quenched rotor while applying vibrations and impacts to the rotor, The method for recovering magnets from a rotor is characterized in that in the vibration transport step, forces are applied to the steel plate and the magnets in vertical directions and in a direction along the transport surface by vibration.

2. 2. The method for recovering magnets from a rotor according to claim 1, wherein the vibration transport step comprises vibrating the transport surface in an oblique direction.

3. 2. The method for recovering magnets from a rotor according to claim 1, wherein in the vibration transport step, the transport surface is inclined downward in the transport direction.

4. 1. An apparatus for recovering magnets from a rotor having a plurality of stacked steel plates and magnets fixed in holes in the steel plates, comprising: The magnet fixing method includes a heating means for heating the rotor to a temperature equal to or higher than the Curie temperature or the brittle temperature of the magnet fixing resin, a quenching means for quenching the rotor heated by the heating means, and a vibration conveying means for conveying the quenched rotor while applying vibrations and impacts thereto, The rotor magnet recovery device is characterized in that the vibration conveying means has vibration applying means for applying a force to the steel plate in a vertical direction and a direction along the conveying surface.

5. 5. The magnet recovery device for a rotor according to claim 4, wherein the vibration applying means vibrates the transport surface in an oblique direction.

6. 5. The magnet recovery device for a rotor according to claim 4, wherein the conveying surface is inclined downward in the conveying direction.

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