A NdFeB magnet detection device for recycling NdFeB waste

Abstract

The present invention discloses a NdFeB magnet detection device for recycling NdFeB waste, comprising a detection device, wherein the detection device is mainly divided into two parts: a transport mechanism and a plurality of detection mechanisms. The detection mechanism detects the NdFeB magnet, and the transport mechanism transports the NdFeB magnet. A material separation mechanism is provided on the outer side of the transport mechanism. The improved NdFeB magnet detection device for recycling NdFeB waste can automatically complete magnetic force detection and multi-stage screening of the NdFeB magnet during the transportation of the NdFeB magnet after a single loading operation is completed. In addition, during the detection and screening operations of the NdFeB magnet, other NdFeB magnet transportation operations are not affected. The device has a high degree of automation and improves the processing efficiency of the NdFeB magnet. The device has a simple structure and does not require frequent calibration operations, which reduces the workload of the operator.

Description

Technical Field

[0001] The present invention relates to the technical field of magnet detection, in particular to a NdFeB magnet detection device for recycling NdFeB waste. Background Art

[0002] Neodymium magnets, also known as NdFeB magnets, are tetragonal crystals formed by neodymium, iron, and boron. The magnetic energy product of this magnet is greater than that of samarium cobalt magnets, and it was the material with the largest magnetic energy product in the world at that time. In the production and use of NdFeB magnets, NdFeB magnet waste is generally recycled and remanufactured to reduce the waste of rare earth materials. After the NdFeB magnets are recycled and remanufactured, they are generally required to be tested.

[0003] As disclosed in CN115097363B, a NdFeB magnet detection device for recycling NdFeB waste includes a tooling table, a fixing fixture, a lifting bracket, a magnetic detection component, and a bracket lifting mechanism installed on the tooling table. A detection port is provided in the center of the tooling table for the NdFeB magnet to be detected by the magnetic detection component for detecting its magnetism. The size of the detection port is smaller than the size of the NdFeB magnet. The magnetic detection component includes an electromagnet, a tension detection mechanism, and a reset mechanism. The electromagnet is located directly below the detection port. The reset mechanism is provided on the lifting bracket, and the reset mechanism is connected to the tension detection mechanism. This application realizes the detection of the magnetic strength of the NdFeB magnet by the mutual attraction between the electromagnet and the NdFeB magnet, and by the cooperation between the tension detection mechanism and the electromagnet, thereby improving the detection accuracy. The present invention also relates to a NdFeB magnet detection method for recycling NdFeB waste.

[0004] According to the above patent, when the NdFeB magnets are subjected to magnetic testing, it is necessary to repeatedly perform loading and unloading operations and intermittent transportation operations of the NdFeB magnets, which is very troublesome and reduces the processing rate of the NdFeB magnets. After the NdFeB magnets have completed the magnetic testing, it is necessary to perform additional material separation operations of the NdFeB magnets based on the test results of the NdFeB magnets, which is very troublesome and increases the workload of the operator. Summary of the Invention

[0005] The object of the present invention is to provide a NdFeB magnet detection device for recycling NdFeB waste, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a NdFeB magnet detection device for recycling NdFeB waste, comprising a detection device, which is mainly divided into two parts: a transportation mechanism and a plurality of detection mechanisms. The detection mechanism detects NdFeB magnets, and the transportation mechanism transports NdFeB magnets. A material separation mechanism is provided on the outside of the transportation mechanism, and the material separation mechanism performs material separation processing on NdFeB magnets.

[0007] Preferably, the detection mechanism includes a first piston cylinder, a first piston rod is slidably inserted into the bottom opening of the first piston cylinder, an electromagnet is fixedly installed at one end of the first piston rod corresponding to the outside of the first piston cylinder, and a pressure detector is fixedly installed on the inner bottom side of the first piston cylinder.

[0008] By adopting the above technical solution, the suction force between the electromagnet and the NdFeB magnet is converted into gas pressure in the first piston cylinder through the mutual cooperation of the first piston rod, the first piston rod and the pressure monitor. The magnetic detection of the NdFeB magnet is accurate and the device does not need to be calibrated frequently.

[0009] Preferably, the transport mechanism includes a belt conveyor, which is mainly divided into three parts: an outer shell, a transport device body and a conveyor belt, and the outer peripheral wall of the conveyor belt is smooth. Two L-shaped support rods are relatively fixedly installed at the middle position of the outer peripheral wall of the first piston cylinder, and the bottom end of each support rod is fixedly connected to the top side of the outer shell.

[0010] By adopting the above technical solution and the arrangement of the support rod and the housing, the first piston cylinder is always located at a suitable position above the belt conveyor, which facilitates the adjustment of the pressure in the first piston cylinder.

[0011] Preferably, a support ring is slidably installed in the top opening of the shell at a position corresponding to the first piston cylinder, a rotating shaft is rotatably installed in the support ring through a bearing, and the spacing between two adjacent rotating shafts is equal, and a soft sleeve is fixedly provided at the middle position of the outer peripheral side of the rotating shaft, and the bottom end of the soft sleeve is located below the corresponding support ring.

[0012] By adopting the above technical solution, the setting of the soft sleeve can increase the roughness of the outer peripheral wall of the rotating shaft, and the setting of the soft sleeve, support ring and rotating shaft can constrain and limit the NdFeB magnet without affecting the sliding of the NdFeB magnet toward the rectangular hole, so that the NdFeB magnet is always aligned with the rectangular hole.

[0013] Preferably, two second piston rods are relatively fixedly installed at the middle position of the top side of the support ring, the top sliding sleeve of the second piston rod is provided with a second piston cylinder, and the outer peripheral wall of the second piston cylinder is fixedly connected to the inner wall of the opening of the outer shell, a spring is provided between the second piston rod and the inner wall of the second piston cylinder, and the two ends of the spring are respectively fixedly connected to the second piston rod and the inner wall of the second piston cylinder, a conduit is fixedly passed through the top end of the second piston cylinder, and the top end of the conduit is inserted into the corresponding first piston cylinder and fixedly connected to the cylinder wall of the corresponding first piston cylinder.

[0014] By adopting the above technical solution, the arrangement of the second piston cylinder, the second piston rod and the guide tube enables the second piston cylinder to synchronously drive the support ring to move downward when it moves downward, without the operator having to perform other operations or setting up an additional power source.

[0015] Preferably, the material distribution mechanism includes a plurality of material guide troughs, and a rectangular hole is opened on one side of the outer wall of the shell at the position corresponding to the electromagnet. The material guide trough is fixedly inserted into the corresponding rectangular hole, and the material guide trough is inclined. The top of the material guide trough is in the same plane as the top side of the conveyor belt.

[0016] By adopting the above technical solution, the rectangular hole and the inclined guide trough can use the gravity of the NdFeB magnet itself to automatically guide the NdFeB magnet to fall above the transportation device at a specific position, without the operator having to move the NdFeB magnet again.

[0017] Preferably, a third piston cylinder is fixedly installed at the position corresponding to the rectangular hole on the other side of the outer wall of the shell, a third piston rod is slidably inserted into the opening of the third piston cylinder, a connecting pipe is fixedly inserted into the bottom of the third piston cylinder, the top end of the connecting pipe is connected to an electric control valve, and the end of the electric control valve away from the corresponding connecting pipe is inserted into the corresponding first piston cylinder and fixedly connected to the cylinder wall of the first piston cylinder.

[0018] By adopting the above technical solution, the arrangement of the electric control valve, the third piston cylinder and the third piston rod enables the first piston rod to automatically drive the push block out of the rectangular groove after falling to the limit, without the operator having to perform other operations or setting up an additional power source.

[0019] Preferably, a rectangular groove is provided on the inner wall of the shell at a position corresponding to the rectangular hole, a push block is slidably inserted into the rectangular groove, the corners of the push block are arranged in an arc shape, and the end of the third piston rod located outside the corresponding third piston cylinder is inserted into the corresponding rectangular groove and fixedly connected to the corresponding push block, and the third piston rod is slidably connected to the shell.

[0020] By adopting the above technical solution, the setting of the push block can increase the contact area between the third piston rod and the NdFeB magnet, so that the third piston rod can smoothly push the NdFeB magnet to move toward the rectangular hole.

[0021] Compared with the prior art, the present invention has the following beneficial effects: the improved NdFeB magnet detection device for recycling NdFeB waste can automatically complete the magnetic force detection and multi-stage screening processing of NdFeB magnets during the transportation of NdFeB magnets after one loading operation is completed, and the detection and screening operations of NdFeB magnets will not affect other NdFeB magnet transportation operations. The device has a high degree of automation and improves the processing efficiency of NdFeB magnets. The device has a simple structure and does not require frequent calibration operations, which reduces the operator's workload. The specific contents are as follows;

[0022] A detection mechanism, a transportation mechanism and a material separation mechanism are provided. When the detection device is used to detect NdFeB magnets, the magnetic force of each NdFeB magnet is converted into air pressure in turn through the cooperation between the transportation mechanism and the detection mechanism, so as to perform magnetic detection of the NdFeB magnet. The detection accuracy is high, and there are no elastic parts in the detection mechanism, so there is no need for frequent calibration and detection. Through the cooperation between the detection mechanism, the transportation mechanism and the material separation mechanism, the multi-stage screening of the NdFeB magnets can be automatically completed after the NdFeB magnets are detected. The cooperation between the transportation mechanism and the material separation mechanism ensures that the NdFeB magnets will not affect the transportation of other NdFeB magnets during detection, thereby improving the processing rate of the NdFeB magnets. The device has a high degree of automation, and a single loading operation can automatically complete the magnetic detection and multi-stage screening processing of the NdFeB magnets during the transportation of the NdFeB magnets. The device has a high degree of automation, which reduces the workload of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall schematic diagram of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of a partial belt conveyor of the present invention;

[0025] Figure 3 Schematic diagram of the internal structure of the first piston cylinder of the present invention;

[0026] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0027] Figure 5 For the present invention Figure 3 Schematic diagram of the enlarged structure at B in the middle;

[0028] Figure 6 Schematic diagram of the internal structure of the support ring of the present invention;

[0029] Figure 7 It is a schematic diagram of the overall structure of the material guide trough of the present invention.

[0030] In the figure: 1. Detection device; 2. Detection mechanism; 21. First piston cylinder; 22. First piston rod; 23. Electromagnet; 24. Pressure detector; 25. Support rod; 3. Transport mechanism; 31. Belt conveyor; 311. Housing; 312. Conveyor belt; 32. Support ring; 33. Rotating shaft; 34. Soft sleeve; 35. Second piston rod; 36. Second piston cylinder; 37. Conduit; 38. Spring; 4. Material distribution mechanism; 41. Rectangular hole; 42. Material guide trough; 43. Third piston cylinder; 44. Third piston rod; 45. Connecting pipe; 46. Electric control valve; 47. Rectangular groove; 48. Push block. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-3 The present invention provides a technical solution: a NdFeB magnet detection device for recycling NdFeB waste, comprising a detection device 1, which is mainly divided into two parts: a transportation mechanism 3 and a plurality of detection mechanisms 2, and the detection mechanism 2 performs detection of NdFeB magnets. The detection mechanism 2 includes a first piston cylinder 21, a first piston rod 22 slidingly inserted into the bottom opening of the first piston cylinder 21, and a sealing ring installed on the outer periphery of the first piston rod 22 to block the gap between the first piston rod 22 and the wall of the first piston cylinder 21. The first piston rod 22 is located at the end corresponding to the outside of the first piston cylinder 21 and is fixedly mounted with an electromagnet 23. The electromagnet 23 is composed of an excitation coil and a housing 311. The excitation coil is fixedly mounted in the housing 311. An infrared sensor is installed at the center of the bottom side of the housing 311 to monitor whether there is a neodymium iron boron magnet below the electromagnet 23. A pressure detector 24 is fixedly mounted on the inner bottom side of the first piston cylinder 21. The pressure detector 24 monitors the air pressure in the first piston cylinder 21 and transmits the monitoring data to an external host via the Internet of Things. Through the interaction between the first piston rod 22, the first piston rod 22 and the pressure monitor, the suction force between the electromagnet 23 and the neodymium iron boron magnet is converted into air pressure in the first piston cylinder 21.

[0033] according to Figure 2 、 Figure 3 、 Figure 4 and Figure 6As shown, the transport mechanism 3 performs the transport operation of the NdFeB magnet. The transport mechanism 3 includes a belt conveyor 31, which is mainly divided into three parts: a shell 311, a transport device body and a transport belt 312. The transport device body is installed in the shell 311, and the transport belt 312 is sleeved on the driving roller of the transport device. The outer peripheral wall of the transport belt 312 is smooth. Two L-shaped support rods 25 are relatively fixedly installed at the middle position of the outer peripheral wall of the first piston cylinder 21, and the bottom end of each support rod 25 is fixedly connected to the top side of the shell 311 by bolts. A support ring 32 is slidably installed in the top opening of the shell 311 at the position corresponding to the first piston cylinder 21. The support ring 32 is a rectangular ring. A rotating shaft 33 is rotatably installed in the support ring 32 through a bearing, and the spacing between two adjacent rotating shafts 33 is equal. The rotating shaft 33 is arranged horizontally, and a fixed sleeve is installed in the middle position of the outer peripheral side of the rotating shaft 33. A soft sleeve 34 is provided, and the bottom end of the soft sleeve 34 is located below the corresponding support ring 32. The soft sleeve 34 is a rubber sleeve. Two second piston rods 35 are relatively fixedly installed at the middle position of the top side of the support ring 32. The top sliding sleeve of the second piston rod 35 is provided with a second piston cylinder 36, and the outer peripheral wall of the second piston cylinder 36 is fixedly connected to the inner wall of the opening of the shell 311. An exhaust hole is provided on the outer wall of the opening of the second piston cylinder 36 so that the gas in the second piston cylinder 36 can be discharged normally. A spring 38 is provided between the second piston rod 35 and the inner wall of the second piston cylinder 36, and the two ends of the spring 38 are respectively fixedly connected to the inner walls of the second piston rod 35 and the second piston cylinder 36. A conduit 37 is fixedly passed through the top of the second piston cylinder 36, and the top of the conduit 37 is inserted into the corresponding first piston cylinder 21 and fixedly connected to the cylinder wall of the corresponding first piston cylinder 21. The arrangement of the support rod 25 and the outer shell 311 ensures that the first piston cylinder 21 is always located in a suitable position above the belt conveyor 31. The arrangement of the soft sleeve 34 can increase the roughness of the outer wall of the rotating shaft 33, and the arrangement of the soft sleeve 34, the support ring 32 and the rotating shaft 33 can constrain and limit the neodymium iron boron magnet without affecting the sliding of the neodymium iron boron magnet toward the rectangular hole 41. The arrangement of the second piston cylinder 36, the second piston rod 35 and the conduit 37 ensures that when the second piston cylinder 36 moves downward, it synchronously drives the support ring 32 to move downward.

[0034] according to Figure 1 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 7As shown, a material distribution mechanism 4 is provided on the outside of the transport mechanism 3, and the material distribution mechanism 4 performs material distribution processing of the NdFeB magnets. The material distribution mechanism 4 includes a number of guide grooves 42, and a rectangular hole 41 is provided on one side of the outer wall of the shell 311 at the position corresponding to the electromagnet 23. The guide groove 42 is fixedly penetrated in the corresponding rectangular hole 41, and the guide groove 42 is inclined. The top of the guide groove 42 is in the same plane as the top side of the conveyor belt 312. A transport device is provided below the discharge port of the guide groove 42 to transport the NdFeB magnets. A third piston cylinder 43 is fixedly installed at the position corresponding to the rectangular hole 41 on the other side of the outer wall of the shell 311. A third piston rod 44 is slidably penetrated in the opening of the third piston cylinder 43. An exhaust hole is provided on the outer wall of the opening of the third piston cylinder 43 so that the gas in the third piston cylinder 43 can be discharged normally. A connecting pipe 45 is fixedly penetrated at the bottom of the third piston cylinder 43. The top of the connecting pipe 45 is connected to and equipped with an electric-controlled valve 46, and the end of the electric-controlled valve 46 away from the corresponding connecting pipe 45 is inserted into the corresponding first piston cylinder 21 and fixedly connected to the cylinder wall of the first piston cylinder 21. A rectangular groove 47 is provided at the position corresponding to the rectangular hole 41 on the inner wall of the shell 311, and a push block 48 is slidably penetrated into the rectangular groove 47. The push block 48 is located on the side outside the corresponding rectangular groove 47 and is in the same plane as the corresponding inner wall of the shell 311. The pushed bottom side is in the same plane as the top side of the conveyor belt 312. The corners of the push block 48 are arranged in an arc shape. The end of the third piston rod 44 located outside the corresponding third piston cylinder 43 is inserted into the corresponding rectangular groove 47 and fixedly connected to the corresponding push block 48. The third piston rod 44 is slidably connected to the shell 311. The rectangular hole 41 and the inclined material guide trough 42 can use the gravity of the neodymium iron boron magnet itself to automatically guide the neodymium iron boron magnet to fall above the transportation device at a specific position. The setting of the electric control valve 46, the third piston cylinder 43 and the third piston rod 44 enables the first piston rod 22 to automatically drive the push block 48 to be pushed out of the rectangular groove 47 after falling to the limit. The setting of the push block 48 can increase the contact area between the third piston rod 44 and the neodymium iron boron magnet.

[0035] Example 1: When using the detection device 1 to detect NdFeB magnets, the operator places the NdFeB magnets on the conveyor belt 312 at a suitable frequency. As the belt conveyor 31 runs, the NdFeB magnets slowly move along a specific trajectory. When the NdFeB magnets move below the electromagnet 23, the infrared sensor detects that the NdFeB magnets move below the electromagnet 23. At this time, the external power supply supplies power to the electromagnet 23, and the electromagnet 23 generates magnetism, which generates attraction between the magnets and the NdFeB magnets, pulling the first piston rod. 22 moves downward, first gradually compressing the air in the first piston cylinder 21, and pressing part of the gas in the first piston cylinder 21 into the conduit 37 and then into the second piston cylinder 36 through the conduit 37, then pushing the second piston rod 35 out of the second piston rod 35, pushing the support ring 32 downward, and finally driving the soft tube to descend, pressing the NdFeB magnet so that the NdFeB magnet fits on the top side of the conveyor belt 312, so that the distance between each NdFeB magnet, the first piston cylinder 21 and the NdFeB magnet remains unchanged;

[0036] It should be noted that when the soft cover 34 is pressed on the NdFeB magnet, due to the friction between the soft cover 34 and the NdFeB magnet, the NdFeB magnet slides on the conveyor belt 312, which does not affect the transportation of other NdFeB magnets.

[0037] When the gas in the first piston cylinder 21 is compressed to its limit, the pressure in the first piston cylinder 21 is maintained at a specific pressure. At this time, the pressure detector 24 monitors the pressure change data in the first piston cylinder 21 and transmits the data to an external control host through the Internet of Things. The control host detects the attraction between the electromagnet 23 and the NdFeB magnet based on the pressure change in the first piston cylinder 21, thereby determining the magnetic force of the NdFeB magnet.

[0038] Example 2: According to Example 1, the external control host determines the location of the rectangular hole 41 from which the NdFeB magnet is to be discharged according to the magnetic force of the NdFeB magnet. When the NdFeB magnet needs to be discharged from the rectangular hole 41 at this location, after the NdFeB magnet completes the magnetic force detection, the external control host controls the electronically controlled valve 46 to open. At this time, most of the gas in the first fixed cylinder is introduced into the third piston cylinder 43 through the connecting pipe 45, and the push block 48 is quickly pushed out of the rectangular groove 47. Since the push block 48 is NdFeB, the NdFeB magnet is discharged from the rectangular hole 41 at this location. The magnets collide with each other, pushing the NdFeB magnets toward the rectangular hole 41. After the NdFeB magnets pass through the rectangular hole 41, they flow obliquely downward along the inclined guide trough 42 and fall onto the transport device below the guide trough 42 to continue transporting the NdFeB magnets. When several NdFeB magnets pass through the rectangular holes 41 at several positions, multiple transport devices can transport the NdFeB magnets to specific locations for the next step of processing, thereby performing multi-stage screening of the NdFeB magnets according to their magnetic properties.

[0039] It should be noted that when the push block 48 pushes the NdFeB magnet to move in the direction of the rectangular hole 41, the soft sleeve 34 rotates around it, so that the friction force between the soft sleeve 34 and the NdFeB magnet does not affect the sliding of the NdFeB magnet in the direction of the rectangular hole 41;

[0040] After the detection of the NdFeB magnet is completed, the external current is reversely input into the electromagnet 23, causing the magnetic pole of the electromagnet 23 to flip. At this time, the NdFeB magnet and the electromagnet 23 repel each other, and the gas in the first piston cylinder 21 pushes the first piston cylinder 21, and the first piston rod 22 that slides out of the first piston cylinder 21 is quickly retracted into the first piston cylinder 21, causing the air pressure in the first piston cylinder 21 to drop. At this time, the gas in the third piston cylinder 43 gradually flows back into the first piston cylinder 21, causing the pressure in the third piston cylinder 43 to decrease. With the push of the third piston rod 44 by the spring 38, the third piston rod 44 is retracted into the third piston cylinder 43, and the support frame and the soft sleeve 34 are pulled up and reset. Repeating the above operations can sequentially continue the subsequent NdFeB magnet detection and screening operations.

[0041] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A NdFeB magnet detection device for recycling NdFeB waste, comprising a detection device (1), characterized in that: The detection device (1) is mainly divided into two parts: a transport mechanism (3) and a plurality of detection mechanisms (2). The detection mechanism (2) performs detection of the NdFeB magnets, and the transport mechanism (3) performs transport operations on the NdFeB magnets. A material separation mechanism (4) is provided outside the transport mechanism (3), and the material separation mechanism (4) performs material separation processing on the NdFeB magnets. The detection mechanism (2) comprises a first piston cylinder (21), a first piston rod (22) slidingly passing through an opening at the bottom end of the first piston cylinder (21), an electromagnet (23) fixedly mounted on one end of the first piston rod (22) corresponding to the outside of the first piston cylinder (21), and a pressure detector (24) fixedly mounted on the inner bottom side of the first piston cylinder (21); The transport mechanism (3) includes a belt conveyor (31), and the belt conveyor (31) is mainly divided into three parts: a housing (311), a transport device body, and a transport belt (312); A support ring (32) is slidably mounted in the top opening of the housing (311) at a position corresponding to the first piston cylinder (21), and a rotating shaft (33) is rotatably mounted in the support ring (32) via a bearing. Two second piston rods (35) are relatively fixedly installed at the middle position of the top side of the support ring (32), the top sliding sleeve of the second piston rod (35) is provided with a second piston cylinder (36), and the outer peripheral wall of the second piston cylinder (36) is fixedly connected to the inner wall of the opening of the shell (311), a spring (38) is provided between the second piston rod (35) and the inner wall of the second piston cylinder (36), and the two ends of the spring (38) are respectively fixedly connected to the second piston rod (35) and the inner wall of the second piston cylinder (36), a guide tube (37) is fixedly passed through the top end of the second piston cylinder (36), and the top end of the guide tube (37) is inserted into the corresponding first piston cylinder (21) and fixedly connected to the cylinder wall of the corresponding first piston cylinder (21); The material distribution mechanism (4) includes a plurality of material guide grooves (42). A rectangular hole (41) is provided on one side of the outer wall of the housing (311) at a position corresponding to the electromagnet (23). The material guide grooves (42) are fixedly inserted into the corresponding rectangular holes (41). The material guide grooves (42) are inclined, and the top ends of the material guide grooves (42) and the top side of the conveyor belt (312) are in the same plane. A third piston cylinder (43) is fixedly installed at a position corresponding to the rectangular hole (41) on the other side of the outer wall of the shell (311), a third piston rod (44) is slidably inserted into the opening of the third piston cylinder (43), a connecting pipe (45) is fixedly inserted into the bottom of the third piston cylinder (43), and an electric control valve (46) is installed at the top end of the connecting pipe (45), and the end of the electric control valve (46) away from the corresponding connecting pipe (45) is inserted into the corresponding first piston cylinder (21) and fixedly connected to the cylinder wall of the first piston cylinder (21).

2. The NdFeB magnet detection device for recycling NdFeB waste according to claim 1, characterized in that: The outer peripheral wall of the conveyor belt (312) is smooth, and two L-shaped support rods (25) are relatively fixedly installed at the middle position of the outer peripheral wall of the first piston cylinder (21), and the bottom end of each support rod (25) is fixedly connected to the top side of the shell (311).

3. The NdFeB magnet detection device for recycling NdFeB waste according to claim 2, characterized in that: The spacing between two adjacent rotating shafts (33) is equal, and a soft sleeve (34) is provided on the fixed sleeve at the middle position of the outer peripheral side of the rotating shaft (33), and the bottom end of the soft sleeve (34) is located below the corresponding support ring (32).

4. The NdFeB magnet detection device for recycling NdFeB waste according to claim 3, characterized in that: A rectangular groove (47) is provided on the inner wall of the housing (311) at a position corresponding to the rectangular hole (41), and a push block (48) is slidably inserted into the rectangular groove (47). The corners of the push block (48) are arranged in an arc shape. One end of the third piston rod (44) located outside the corresponding third piston cylinder (43) is inserted into the corresponding rectangular groove (47) and fixedly connected to the corresponding push block (48). The third piston rod (44) is slidably connected to the housing (311).

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