Permanent magnet internal defect detecting and sorting system

Abstract

The utility model discloses a permanent magnet internal defect detecting and sorting system which comprises a supporting ring lifting device and a vibration generating device, a feeding conveying belt, a qualified material discharging conveying belt, a waste material discharging conveying belt and a sound vibration signal collecting and processing device are arranged on the side of the supporting ring lifting device, and a first pushing device is arranged on the opposite side of the waste material discharging conveying belt. A second pushing device is arranged on the opposite side of the qualified product discharging conveying belt. The feeding conveying belt, the qualified material discharging conveying belt and the waste material discharging conveying belt are matched, so that a detected permanent magnet is more efficiently fed into and discharged out of the supporting ring lifting device, the supporting ring lifting device is matched with the acoustic vibration signal collecting and processing device and the vibration generating device, continuous internal defect detection of the detected permanent magnet is achieved, and the sorting efficiency is higher. In the transfer process of the detected permanent magnet, the supporting ring lifting device is surrounded by the feeding conveying belt, the qualified material discharging conveying belt and the waste material discharging conveying belt, so that the permanent magnet is carried in place and is not easy to fall off.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet detection, in particular to a permanent magnet internal defect detection and sorting system. Background Art

[0002] Permanent magnets are tile-shaped magnets typically made from magnetic materials such as ferrite and neodymium iron boron. They are key components for generating magnetic fields in permanent magnet motors. However, the complex manufacturing process of permanent magnets inevitably leads to internal structural defects. Even subtle defects can reduce the mechanical strength of the permanent magnets, affect their magnetic properties and the efficiency of the motor, and even damage the motor. In actual production, internal defects in permanent magnets still rely on manual inspection, as internal defects can alter the acoustic and vibration characteristics of the excited arc magnets. This traditional inspection method relies entirely on human hearing and subjective experience. Its efficiency, inspection standards, and speed are easily affected by human factors. Furthermore, excessive force can cause secondary damage to the tiles, introducing new defects or exacerbating existing ones. This method is not suitable for large-scale, mass-produced permanent magnet production. Several devices for detecting internal defects in permanent magnets have gradually emerged on the market. Patent document CN202411785896.9 discloses a device and method for acoustic and vibration nondestructive testing of internal defects in tiles. The patent discloses an acoustic vibration nondestructive testing device for internal defects of magnetic tiles. In an assembly line, the magnetic tiles from the assembly line are received by a circular ring, and then the rotating platform is used to perform the detection and classification steps. This structure can effectively detect and classify the magnetic tiles, but because the component supporting the magnetic tiles set on the rotating platform is in the shape of a circular ring, there is a risk that the permanent magnets will not be properly received or will fall off during rotation. Therefore, in order to address the above-mentioned problems, a permanent magnet internal defect detection and sorting system is provided, which has higher sorting efficiency, is less likely to fall off when the inspected permanent magnets are moved, and has a more secure reception of the inspected permanent magnets. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a permanent magnet internal defect detection and sorting system.

[0004] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is: it includes a support ring lifting device that drives the inspected permanent magnet to rise and fall, a vibration generating device is arranged under the support ring lifting device, and a feed conveyor belt, a qualified discharge conveyor belt, a waste discharge conveyor belt and an acoustic vibration signal acquisition and processing device are arranged on the side of the support ring lifting device. A first pushing device is arranged on the opposite side of the waste discharge conveyor belt, and a second pushing device is arranged on the opposite side of the qualified discharge conveyor belt. The first pushing device and the second pushing device are used to push the inspected permanent magnet on the support ring lifting device out; the vibration generating device cooperates with the acoustic vibration signal acquisition and processing device to detect the inspected permanent magnet; the output end of the feed conveyor belt is higher than the input end of the qualified discharge conveyor belt and the waste discharge conveyor belt.

[0005] Furthermore, the support ring lifting device includes a lifting platform and a support ring, the support ring is fixed at the lifting end of the lifting platform, and the support ring is arranged at the conveying and handover position of the feed conveyor belt, the qualified discharge conveyor belt, and the waste discharge conveyor belt.

[0006] Furthermore, when the support ring is lifted to the highest position, the support ring is flush with the feed conveyor belt; when the support ring is lifted to the lowest position, the support ring is flush with the qualified discharge conveyor belt and the waste discharge conveyor belt.

[0007] Furthermore, the vibration generating device includes a resonant sound and a double-peak vibration transmission cone, the double-peak vibration transmission cone is fixed on the upper surface of the resonant sound, and the vibration generating device is arranged directly below the support ring lifting device.

[0008] Furthermore, the acoustic vibration signal collection and processing device includes a collection microphone and a microphone bracket, and the collection microphone is installed on the side of the supporting ring through the microphone bracket.

[0009] Furthermore, the first pushing device and the second pushing device have the same structure. Both the first pushing device and the second pushing device include a push rod base and a cylinder. The cylinder is horizontally fixed on the top of the push rod base, and a horizontal push plate is fixed to the telescopic end of the cylinder.

[0010] Furthermore, the qualified material discharging conveyor belt and the waste material discharging conveyor belt are located on the same horizontal plane.

[0011] Furthermore, the height of the feed conveyor belt is higher than the height of the qualified discharge conveyor belt.

[0012] The beneficial effects of the utility model are:

[0013] The utility model utilizes a feed conveyor, a qualified discharge conveyor, and a waste discharge conveyor to more efficiently transport the inspected permanent magnets into and out of the support ring lifting device. The support ring lifting device, in conjunction with an acoustic signal acquisition and processing device and a vibration generating device, enables continuous internal defect detection of the inspected permanent magnets, resulting in higher sorting efficiency. During the transport of the inspected permanent magnets, the support ring lifting device is surrounded by the feed conveyor, the qualified discharge conveyor, and the waste discharge conveyor, providing a more secure reception and making the inspected permanent magnets less likely to fall during transfer.

[0014] The support ring lifting device and the pushing device of the utility model cooperate to prevent the permanent magnet from being misplaced or falling off during rotation during the process of detecting internal defects, thereby reducing the need for manual correction.

[0015] The double-peak vibration transmission cone of the vibration generating device of the utility model has a better effect than the single-peak vibration transmission cone. The vibration generating device is combined with the acoustic vibration signal acquisition and processing device, and the characteristics of the acquired acoustic vibration signal are more obvious, which is conducive to better judgment of the internal defects of the permanent magnet being inspected.

[0016] The feeding conveyor of the utility model feeds the inspected permanent magnet into the supporting ring lifting device. When the supporting ring lifting device is lifted to the highest point, it is used to receive the inspected permanent magnet dropped from the feeding conveyor. The supporting ring lifting device drives the inspected permanent magnet to the lowest point. The vibration generating device cooperates with the acoustic signal acquisition and processing device to perform internal defect detection on the inspected permanent magnet. After the internal defect detection of the inspected permanent magnet, the first pushing device cooperates with the waste discharging conveyor belt, and the second pushing device cooperates with the qualified discharging conveyor belt to send the inspected permanent magnet to the corresponding screening area.

[0017] Compared with the existing permanent magnet internal defect detection device, the utility model can better support the inspected permanent magnet when transporting the inspected permanent magnet, thereby preventing the inspected permanent magnet from falling during transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a partial structural perspective diagram of the utility model;

[0020] Figure 3 It is a structural diagram of the support ring lifting device;

[0021] Figure 4 It is a schematic structural diagram of the first pushing device and the second pushing device;

[0022] Figure 5 It is a structural schematic diagram of a vibration generating device;

[0023] The symbols of the components are as follows:

[0024] 1. Base; 2. First pushing device; 21. Cylinder; 22. Horizontal push plate; 23. Air pump; 24. Push rod base; 3. Support ring lifting device; 31. Lifting platform; 32. Support ring; 4. Acoustic and vibration signal acquisition and processing device; 41. Acquisition microphone; 42. Microphone holder; 5. Vibration generating device; 51. Resonant sound; 52. Double-peak vibration transmission cone; 6. Permanent magnet to be tested; 7. Feed and discharge conveyor belts; 71. Feed conveyor belt; 72. Qualified discharge conveyor belt; 73. Waste discharge conveyor belt; 8. Second pushing device. DETAILED DESCRIPTION

[0025] The specific implementation methods of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific implementation methods. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all utility model creations using the concept of the present invention are protected.

[0026] like Figures 1 to 2 As shown, the permanent magnet internal defect detection and sorting system includes a support ring lifting device 3 that drives the inspected permanent magnet 6 to rise and fall. A vibration generator 5 is located below the support ring lifting device 3. A feed conveyor belt 71, a qualified discharge conveyor belt 72, a waste discharge conveyor belt 73, and an acoustic vibration signal acquisition and processing device 4 are located on the sides of the support ring lifting device 3. A first pushing device 2 is located opposite the waste discharge conveyor belt 73, and a second pushing device 8 is located opposite the qualified discharge conveyor belt 72. The first pushing device 2 and the second pushing device 8 are used to push the inspected permanent magnet 6 from the support ring lifting device 3. The vibration generator 5 cooperates with the acoustic vibration signal acquisition and processing device 4 to detect defects in the inspected permanent magnet 6. The output end of the feed conveyor belt 71 is higher than the input ends of the qualified discharge conveyor belt 72 and the waste discharge conveyor belt 73. The qualified discharge conveyor belt 72 and the waste discharge conveyor belt 73 are located on the same horizontal plane, and the height of the feed conveyor belt 71 is higher than that of the qualified discharge conveyor belt 72. The feeding conveyor belt 71 , the qualified discharging conveyor belt 72 and the waste discharging conveyor belt 73 constitute the feeding and discharging conveyor belt 7 , thereby realizing the feeding and discharging of permanent magnets.

[0027] like Figure 3As shown, the support ring lifting device 3 includes a lifting platform 31 and a support ring 32. The support ring 32 is fixed to the lifting end of the lifting platform 31. The support ring 32 is set at the conveying and handover position of the feed conveyor belt 71, the qualified discharge conveyor belt 72, and the waste discharge conveyor belt 73. When the support ring 32 is lifted to the highest point, the support ring 32 is flush with the feed conveyor belt 71. When the support ring 32 is lifted to the lowest point, the support ring 32 is flush with the qualified discharge conveyor belt 72 and the waste discharge conveyor belt 73. The support ring 32 can be replaced and adapted according to the model and size of the permanent magnet 6 to be inspected. There is a certain suspension distance between the bottom of the support ring 32 and the lifting platform 31. The support ring 32 can be fixed and suspended in the air using a bracket, thereby leaving a certain space for the bottom of the permanent magnet 6 to be inspected.

[0028] like Figure 4 As shown, the first pushing device 2 and the second pushing device 8 have the same structure. Both the first pushing device 2 and the second pushing device 8 include a push rod base 24 and a cylinder 21. The cylinder 21 is horizontally fixed on the top of the push rod base 24. The telescopic end of the cylinder 21 is fixed with a horizontal push plate 22.

[0029] like Figure 5 As shown, the vibration generating device 5 includes a resonant sound 51 and a double-peak vibration cone 52, and the vibration generating device 5 is arranged directly below the support ring lifting device 3. The double-peak vibration cone 52 is fixed on the upper surface of the resonant sound 51. Its function is to drive the double-peak vibration cone 52 to vibrate synchronously through the resonant sound 51 to continuously output a vibration signal of 95Hz frequency to the permanent magnet 6 under test in the support ring 32. The acoustic signal acquisition and processing device 4 includes a collection microphone 41 and a microphone bracket 42. The collection microphone 41 is installed on the side of the support ring 32 through the microphone bracket 42. The vibration generating device 5 cooperates with the acoustic signal acquisition and processing device 4 to realize the detection of internal defects of the permanent magnet 6 under test. The collection microphone 41 is connected to the host computer. When the support ring 32 is raised and lowered to the lowest point, the bottom of the inspected permanent magnet 6 contacts the double-peak vibration transmission cone 52 and generates an acoustic vibration signal. After the collection microphone 41 collects the resonance signal generated during the contact, the collection microphone 41 collects the acoustic vibration signal and inputs it into the host computer to obtain whether the inspected permanent magnet 6 has internal defects, thereby cooperating with the first pushing device 2 and the second pushing device 8 for sorting.

[0030] The PLC controller is also included. The PLC controller controls the expansion and contraction of the cylinder 21 by controlling the air pump 23. The cylinder 21 and the air pump 23 are connected by a pipeline. The lifting platform 31 of the support ring lifting device 3 is electrically connected to the PLC controller, and the PLC controller controls the lifting position of the lifting platform 31.

[0031] It also includes a base 1, on which the first pushing device 2, the support ring lifting device 3, the sound and vibration signal acquisition and processing device 4, the vibration generating device 5, the feed conveyor belt 71, the qualified discharge conveyor belt 72, the waste discharge conveyor belt 73 and the second pushing device 8 are all fixedly mounted.

[0032] The working principle of the acoustic and vibration signal acquisition and processing device 4 and the vibration generating device 5 is: the internal defects of the inspected permanent magnet 6 can change its excited acoustic and vibration characteristics, and the internal defects of the permanent magnet can be effectively detected through the vibration signal. The lifting platform 31 controls the support ring 32 to rise vertically to be flush with the feed conveyor belt 71, and then the feed conveyor belt 71 transports the inspected permanent magnet 6 to the support ring 32 in the support ring lifting device 3, and then the lifting platform 31 controls the support ring to drop vertically to be flush with the qualified discharge conveyor belt 72 and the waste discharge conveyor belt 73. At this time, the inspected permanent magnet 6 just slightly contacts the double-peak vibration transmission cone 52 and generates an acoustic vibration signal. The acoustic vibration signal is then collected by the acoustic vibration signal acquisition and processing device and input into the host computer, and then it is given whether the inspected permanent magnet 6 has internal defects, and the detection results are output to the first pushing device 2 and the second pushing device 8. If the detection result is that there are no internal defects, the inspected permanent magnet 6 is pushed to the qualified discharge conveyor belt by the second pushing device 8. If it is detected that the inspected permanent magnet 6 has internal defects, the inspected permanent magnet 6 is pushed to the waste discharge conveyor belt 73 by the first pushing device 2. After the inspected permanent magnet 6 is pushed away from the support ring 32, the first pushing device 2 or the second pushing device 8 quickly returns to its original position, and then the lifting platform 31 controls the support ring 32 to rise vertically to be flush with the feed conveyor belt 71 to prepare to support the next inspected permanent magnet 6. Such a support ring lifting device 3 and pushing device prevent the inspected permanent magnet 6 from being misplaced or falling during rotation during the process of detecting internal defects. The double-peak vibration transmission cone 52 of the vibration generating device 5 has a better effect than the single-peak vibration transmission cone, and the characteristics of the collected acoustic vibration signal are more obvious.

[0033] Working process and principle: The detection process of the permanent magnet internal defect detection and sorting system is as follows:

[0034] S1. The permanent magnet 6 to be inspected is transported forward by the feeding conveyor belt 71. The lifting platform 31 vertically raises the support ring 32 to be flush with the feeding conveyor belt 71 so that the support ring 32 supports the permanent magnet 6 to be inspected.

[0035] S2. The lifting platform 31 vertically lowers the support ring 32 and the tested permanent magnet 6 it supports to a position that is flush with the qualified material discharge conveyor 72 and the waste material discharge conveyor 73. The resonant sounder 51 continuously outputs vibration at a frequency of 95 Hz and drives the double-peak vibration transmission cone 52 to produce synchronous vibration. The tested permanent magnet 6 contacts the double-peak vibration transmission cone 52 through the circular hollow part of the support ring 32 and generates an acoustic vibration signal.

[0036] S3, collecting the acoustic vibration signal generated by the inspected permanent magnet 6 through the acoustic vibration signal collecting and processing device 4, and detecting and judging the internal defects of the inspected permanent magnet 6 based on the acoustic vibration signal;

[0037] S4. If the detection result of the acoustic vibration signal acquisition and processing device 4 is that there is an internal defect, the first pushing device 2 will push the inspected permanent magnet 6 supported on the support ring 32 to the waste material discharging conveyor 73; if the detection result of the acoustic vibration signal acquisition and processing device 4 is that there is no internal defect, the second pushing device 8 will push the inspected permanent magnet 6 supported on the support ring 32 to the qualified material discharging conveyor 72.

Claims

1. A permanent magnet internal defect detection and sorting system, characterized in that: The invention comprises a support ring lifting device (3) for driving the permanent magnet (6) to be inspected to rise and fall, a vibration generating device (5) is arranged below the support ring lifting device (3), a feeding conveyor belt (71), a qualified discharging conveyor belt (72), a waste discharging conveyor belt (73) and an acoustic vibration signal acquisition and processing device (4) are arranged on the side of the support ring lifting device (3), a first pushing device (2) is arranged on the opposite side of the waste discharging conveyor belt (73), and a second pushing device (8) is arranged on the opposite side of the qualified discharging conveyor belt (72); the output end of the feed conveyor belt (71) is higher than the input end of the qualified discharging conveyor belt (72) and the waste discharging conveyor belt (73).

2. The permanent magnet internal defect detection and sorting system according to claim 1, characterized in that: The support ring lifting device (3) comprises a lifting platform (31) and a support ring (32), wherein the support ring (32) is fixed to the lifting end of the lifting platform (31), and the support ring (32) is arranged at a conveying and handover position of a feed conveyor belt (71), a qualified discharge conveyor belt (72), and a waste discharge conveyor belt (73).

3. The permanent magnet internal defect detection and sorting system according to claim 2, characterized in that: When the support ring (32) is lifted to the highest position, the support ring (32) is flush with the feed conveyor belt (71); when the support ring (32) is lifted to the lowest position, the support ring (32) is flush with the qualified discharge conveyor belt (72) and the waste discharge conveyor belt (73).

4. The permanent magnet internal defect detection and sorting system according to claim 2, characterized in that: The vibration generating device (5) includes a resonant sound (51) and a double-peaked vibration transmission cone (52), wherein the double-peaked vibration transmission cone (52) is fixed on the upper surface of the resonant sound (51), and the vibration generating device (5) is arranged directly below the support ring lifting device (3).

5. The permanent magnet internal defect detection and sorting system according to claim 2, characterized in that: The acoustic vibration signal acquisition and processing device (4) comprises a collection microphone (41) and a microphone bracket (42), and the collection microphone (41) is installed on the side of the supporting ring (32) via the microphone bracket (42).

6. The permanent magnet internal defect detection and sorting system according to claim 1, characterized in that: The first pushing device (2) and the second pushing device (8) have the same structure. Both the first pushing device (2) and the second pushing device (8) comprise a push rod base (24) and a cylinder (21). The cylinder (21) is horizontally fixed on the top of the push rod base (24). A horizontal push plate (22) is fixed to the telescopic end of the cylinder (21).

7. The permanent magnet internal defect detection and sorting system according to claim 1, characterized in that: The qualified material discharging conveyor belt (72) and the waste material discharging conveyor belt (73) are located on the same horizontal plane.

8. The permanent magnet internal defect detection and sorting system according to claim 1, characterized in that: The height of the feed conveyor belt (71) is higher than the height of the qualified discharge conveyor belt (72).

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