Device for testing magnetic performance of neodymium iron boron rare earth permanent magnet

Abstract

A neodymium iron boron rare earth permanent magnet iron performance testing device disclosed by the present invention comprises a base, the top of the base is symmetrically and fixedly connected with displacement guide rails, the outer side of the base is fixedly connected with a driving motor, the output end of the driving motor is fixedly connected with a screw rod, and the outer side of the screw rod is in threaded connection with a fixing mechanism. The outer side of the displacement guide rail is slidably connected with a sliding seat, the top of the sliding seat is fixedly connected with a mounting plate, and the top of the mounting plate is fixedly connected with a magnetic stress block. The device is provided with an attractive force testing device, and a shifting plate compresses a compression spring on the inner side of a graduated drum. The elastic force generated by compression of the compression spring is balanced with the attraction force between the to-be-tested magnet and the magnetic stress block, at the moment, the compression amount of the compression spring can be read by observing the position of the shifting plate on the outer side of the graduated drum, and the attraction force between the to-be-tested magnet and the magnetic stress block can be calculated according to the Hooke's law.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic performance testing, in particular to a magnetic performance testing device for a neodymium iron boron rare earth permanent magnet. Background Art

[0002] In modern industry and scientific research, NdFeB rare earth permanent magnets are widely used in electronics, electricity, machinery and many other industries due to their excellent magnetic properties. Accurately measuring their magnetic performance parameters, especially the attraction force, is crucial to evaluating the quality of magnets, optimizing product design and ensuring the efficient and stable operation of related equipment.

[0003] Existing devices have obvious deficiencies in multiple measurements and data processing. Multiple measurements are an important means to reduce random errors and improve measurement accuracy, but most devices are difficult to quickly and conveniently achieve multiple measurements. Either there is a lack of switchable measurement components, or the switching process is complicated and time-consuming, which makes the process of obtaining multiple measurement data and performing average calculations extremely inconvenient, and cannot effectively improve the accuracy and reliability of the measurement. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a NdFeB rare earth permanent magnet magnetic property testing device, which solves the problem that the prior device is difficult to quickly and conveniently achieve multiple measurements.

[0005] To achieve the above purpose, the present invention is implemented through the following technical solutions: a NdFeB rare earth permanent magnet magnetic property testing device, comprising: a base, the top of the base is symmetrically fixedly connected with a displacement guide rail, the outer side of the base is fixedly connected with a driving motor, the output end of the driving motor is fixedly connected with a lead screw, the outer side of the lead screw is threadedly connected with a fixing mechanism, the outer side of the displacement guide rail is slidably connected with a sliding seat, the top of the sliding seat is fixedly connected with a mounting plate, the top of the mounting plate is fixedly connected with a magnetic force block, the outer side of the mounting plate is slidably connected with a sliding sleeve, the inner side of the sliding sleeve is rotatably connected with a threaded sleeve, the lead screw is driven to rotate by the driving motor to move the fixing mechanism, thereby changing the distance between the magnet to be tested and the magnetic force block fixed to the top of the sliding seat through the mounting plate, and the attraction force testing mechanism can be used to record the suction between the two; An attraction testing mechanism, the attraction testing mechanism is used to record the suction force between the magnetic force block and the magnet to be tested, the bottom of the attraction testing mechanism is fixedly connected to the side of the base away from the driving motor, the attraction testing mechanism includes a protective shell, the top of the protective shell is rotatably connected to a cover plate, the inner side of the protective shell is rotatably connected to a turntable, the inner side of the turntable is fixedly connected to a scale cylinder, the side of the scale cylinder away from the turntable is fixedly connected to a connecting seat, the center of the connecting seat is rotatably connected to an auxiliary component, the inner side of the scale cylinder is fixedly connected to a compression spring, the outer side of the compression spring is fixedly connected to a dial plate, the side of the dial plate close to the compression spring is fixedly connected to a pull rod, the sliding sleeve and the threaded sleeve on the outer side of the mounting plate pull the pull rod, and the pull rod pulls the dial plate, so that the dial plate compresses the compression spring on the inner side of the scale cylinder. The compression spring is compressed to produce elastic deformation, and its elastic force is balanced with the attraction between the magnet to be tested and the magnetic force block. At this time, the compression amount of the compression spring can be read by observing the position of the dial plate on the outer side of the scale cylinder; The auxiliary component includes a fixed cylinder, a scale rod is fixedly connected to the outer side of the fixed cylinder, a counting plate is slidably connected to the outer side of the scale rod, a connecting rod is fixedly connected to the outer side of the counting plate, and a reset plate is fixedly connected to the end of the connecting rod away from the counting plate. When the dial plate moves along the surface of the scale cylinder, it simultaneously drives the counting plate to slide along the surface of the scale rod, and the scales on the scale grooves on the surface of the scale rod correspond to the scales on the surface of the scale cylinder.

[0006] Preferably, both ends of the screw rod of the base are rotatably connected to the top of the base, the bottom of the fixing mechanism is slidably connected to the outer side of the displacement guide rail, and the side of the base away from the drive motor is fixedly connected to the top of the protective shell. When the drive motor is started, its output end drives the screw rod to rotate, and due to the threaded cooperation between the screw rod and the displacement adjustment seat, the displacement adjustment seat slides along the displacement guide rail toward the side away from the attraction testing mechanism. The displacement guide rail is engraved with a distance scale for recording the sliding distance between the fixing mechanism and the sliding seat.

[0007] Preferably, the outer side of the auxiliary component is fixedly connected to the inner side of the protective shell, the inner side of the dial plate is fixedly connected to the outer side of the scale cylinder, the outer wall of the pull rod is slidably connected to the inner wall of the scale cylinder, and the end of the pull rod away from the dial plate is threadedly connected to the inner side of the threaded sleeve. The threaded sleeve is disconnected from the pull rod by rotating it, and then the cover plate on the top of the protective shell is opened, and the connecting seat is rotated to synchronously drive the scale cylinder and the turntable to move, thereby switching other components such as the scale cylinder and the pull rod to be relative to the threaded sleeve, performing multiple measurements, and obtaining multiple measurement data.

[0008] Preferably, the outer side of the fixed cylinder is fixedly connected to the inner side of the protective shell, the outer side of the fixed cylinder is rotatably connected to the center of the connecting seat, the outer wall of the connecting rod is fixedly connected to the inner wall of the fixed cylinder, the end of the scale rod away from the fixed cylinder is fixedly connected to the center of the turntable, and a scale groove is opened in the wall of the scale rod. When the dial plate is reset, it will be separated from the counting plate. At this time, the counting plate can stay at the farthest scale position reached during its sliding process; the maximum compression amount of the compression spring during this measurement process is recorded.

[0009] Preferably, the fixing mechanism includes a displacement adjustment seat, the top of the displacement adjustment seat is fixedly connected to a mounting shell, the inner side of the mounting shell is slidably connected to a clamping assembly, the top of the mounting shell is fixedly connected to a limit plate, the top of the limit plate is threadedly connected to a threaded rod, the bottom of the threaded rod is rotatably connected to a pressure plate, the magnet to be tested is placed on the clamping assembly in the mounting shell, and then the pressure plate can be moved downward by rotating the threaded rod on the top of the limit plate.

[0010] Preferably, the bottom of the displacement adjustment seat is slidably connected to the outer side of the displacement guide rail, the inner side of the displacement adjustment seat is threadedly connected to the outer wall of the screw rod, and the outer side of the pressure plate is slidably connected to the inner side of the limit plate. The pressure plate can press the magnet to be tested and the stepped clamping seat in the clamping assembly to prevent the magnet from being displaced or shaking during the detection process.

[0011] Preferably, the clamping assembly includes a stepped clamping seat, the outer side of the stepped clamping seat is fixedly connected to a limit slider, the inner side of the limit slider is slidably connected to a T-shaped plate, the top of the T-shaped plate is fixedly connected to a guide rod, the outer side of the guide rod is fixedly connected to a buffer spring, the top of the buffer spring is fixedly connected to a sliding block, and the inner side of the limit slider is fixedly connected to a spring sheet. During the downward movement of the pressure plate, the sliding block moves downward with the pressure plate, and presses the guide rod downward through the buffer spring. At this time, the guide rod can drive the T-shaped plate to move downward. During the downward movement of the T-shaped plate, both sides of the T-shaped plate slide along the sliding grooves opened in the wall of the limit slider. At this time, the two limit sliders approach each other during the downward movement of the T-shaped plate, forcing the spring sheet to be compressed and driving the two stepped clamping seats to approach each other.

[0012] Preferably, the outer side of the stepped clamping seat is slidably connected to the inner side of the mounting shell, the limit slider is slidably connected to the side of the mounting shell close to the limit plate, the inner side of the sliding block is slidably connected to the outer wall of the guide rod, and the outer side of the sliding block is fixedly connected to the side of the pressure plate close to the limit plate. The stepped design of the stepped clamping seat can adapt to magnets of different shapes and sizes. By rationally utilizing the different positions of the steps on both sides, all-round stable clamping can be achieved within the minimum moving distance. The special stepped shape is used to accurately limit the magnet in the horizontal direction, and the pressure can be evenly dispersed to avoid excessive local force.

[0013] The present invention provides a NdFeB rare earth permanent magnet magnetic property testing device, which has the following beneficial effects: (I) The device fixes the magnet to be tested by setting a fixing mechanism, places the magnet to be tested on the clamping assembly in the mounting shell, and then moves the pressure plate downward by rotating the threaded rod on the top of the limit plate. At this time, the pressure plate can press the magnet to be tested and the stepped clamping seat in the clamping assembly to prevent the magnet from being displaced or shaken during the detection process, which affects the accuracy of the detection result.

[0014] (ii) The device is provided with a clamping assembly. When the pressure plate moves downward, the sliding block moves downward with the pressure plate, and the guide rod is pressed downward by the buffer spring. At this time, the guide rod can drive the T-shaped plate to move downward. When the T-shaped plate moves downward, both sides thereof slide along the slide grooves provided in the wall of the limit slider. At this time, the two limit sliders approach each other when the T-shaped plate moves downward, forcing the spring sheet to be compressed and driving the two stepped clamping seats to approach each other, thereby laterally limiting the magnet to be tested.

[0015] (III) The device provides a stable and comprehensive fixing effect for the magnet to be tested by setting a pressure plate and a stepped clamping seat. The pressure plate not only presses the magnet firmly in the vertical direction by its own downward pressure, ensuring that it will not shift due to vertical force during the test, but also transmits pressure with the help of the linkage structure. The stepped design of the stepped clamping seat can adapt to magnets of different shapes and sizes. By rationally utilizing the different positions of the steps on both sides, it can achieve all-round stable clamping within the minimum moving distance. The synergistic effect of the two can effectively prevent the magnet from being displaced, shaken or deformed during testing, ensuring the high accuracy and reliability of the magnetic performance test results, and improving the versatility and stability of the test device.

[0016] (IV) The device sets an attraction test device, and the sliding sleeve and threaded sleeve on the outside of the mounting plate pull the pull rod, and the pull rod pulls the dial plate, so that the dial plate compresses the compression spring on the inside of the scale cylinder. The compression spring is compressed to produce elastic deformation, and its elastic force is balanced with the attraction between the magnet to be tested and the magnetic force block. At this time, the compression amount of the compression spring can be read by observing the position of the dial plate on the outside of the scale cylinder. Since the elastic coefficient of the compression spring is known, according to Hooke's law F=kx (where F is the spring force, k is the elastic coefficient, and x is the spring deformation), the attraction between the magnet to be tested and the magnetic force block can be calculated.

[0017] (V) The device is provided with a connecting seat. After a test is completed, the threaded sleeve can be disconnected from the pull rod by rotating the threaded sleeve, and then the cover on the top of the protective shell is opened and the connecting seat is rotated to synchronously drive the scale cylinder to move with the turntable, thereby switching the positions of other components such as the scale cylinder and the pull rod relative to the threaded sleeve. Multiple measurements can be performed to obtain multiple measurement data and average them, which can effectively reduce the influence of random errors on the measurement results and make the final attraction value closer to the true value, thereby improving the accuracy of the measurement.

[0018] (VI) The device is equipped with auxiliary components. When the dial moves along the surface of the scale cylinder, it drives the counting plate to slide along the surface of the scale rod. When the dial is reset, it will be separated from the counting plate. At this time, the counting plate can stay at the farthest scale position reached during its sliding process; the maximum compression amount of the compression spring during this measurement process is recorded. Then, according to Hooke's law, the maximum attraction value between the two at this distance is accurately calculated, which provides key data for the subsequent analysis of the magnetic properties of the magnet to be tested.

[0019] (VII) The device sets a counting board, so the operator does not need to pay attention to the movement process of the dial board in real time. After a measurement is completed, the operator can directly read the scale where the counting board stops to obtain the measurement result. It has good intuitiveness and repeatability. After a test is completed, the staff can pull the reset board to reset the counting board to the side close to the fixed cylinder through the connecting rod. During multiple measurements, each counting board can independently record the corresponding scale of the maximum attraction in each measurement process, which is convenient for comparison and analysis of multiple measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 It is a structural schematic diagram of the sliding seat of the present invention; Figure 4 It is a structural schematic diagram of the fixing mechanism of the present invention; Figure 5 It is a structural schematic diagram of the pressing plate of the present invention; Figure 6 It is a schematic diagram of the structure of the clamping assembly of the present invention; Figure 7 It is a structural schematic diagram of the attraction testing mechanism of the present invention; Figure 8 It is a schematic structural diagram of the graduated cylinder of the present invention; Fig. 9 It is a schematic diagram of the structure of the auxiliary components of the present invention.

[0021] In the figure: 1, base; 2, displacement guide rail; 3, drive motor; 4, lead screw; 5, attraction force testing mechanism; 6, fixing mechanism; 7, sliding seat; 8, mounting plate; 9, magnetic force block; 10, sliding sleeve; 11, threaded sleeve; 61, displacement adjustment seat; 62, mounting shell; 63, clamping assembly; 64, limit plate; 65, threaded rod; 66, pressure plate; 631, stepped clamping seat; 632, limit slider; 633, T-shaped plate; 634, spring; 635, guide rod; 636, buffer spring; 637, sliding block; 51, protective shell; 52, cover plate; 53, turntable; 54, auxiliary component; 55, scale cylinder; 56, connecting seat; 57, compression spring; 58, pull rod; 59, dial plate; 541, fixed cylinder; 542, scale rod; 543, scale groove; 544, counting plate; 545, connecting rod; 546, reset plate. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-9 The present invention provides a technical solution: a NdFeB rare earth permanent magnet magnetic property testing device, comprising: The base 1 has a displacement guide rail 2 symmetrically fixedly connected to the top of the base 1, a driving motor 3 fixedly connected to the outside of the base 1, a screw rod 4 fixedly connected to the output end of the driving motor 3, a fixing mechanism 6 threadedly connected to the outside of the screw rod 4, a sliding seat 7 slidably connected to the outside of the displacement guide rail 2, a mounting plate 8 fixedly connected to the top of the sliding seat 7, a magnetic force block 9 fixedly connected to the top of the mounting plate 8, a sliding sleeve 10 slidably connected to the outside of the mounting plate 8, and a threaded sleeve 11 rotatably connected to the inside of the sliding sleeve 10; both ends of the screw rod 4 of the base 1 are rotatably connected to the top of the base 1, the bottom of the fixing mechanism 6 is slidably connected to the outside of the displacement guide rail 2, and the base 1 is away from the driving motor 3. The side is fixedly connected to the top of the protective shell 51, and the magnet to be tested is fixed by the fixing mechanism 6. Then, the sliding seat 7 is slid along the displacement guide rail 2 on the top of the base 1 to the side close to the attraction testing mechanism 5, and the threaded sleeve 11 is sleeved on the outside of the pull rod 58 by the sliding sleeve 10. Then, the threaded sleeve 11 is fixed to the pull rod 58 by rotating the threaded sleeve 11, and then the lead screw 4 is driven by the driving motor 3 to rotate, so that the fixing mechanism 6 moves, thereby changing the distance between the magnet to be tested and the magnetic force block 9 fixed to the top of the sliding seat 7 by the mounting plate 8. At this time, the attraction testing mechanism 5 can be used to record the suction between the two, so as to realize the test of the magnetic properties of the NdFeB rare earth permanent magnet.

[0024] The attraction testing mechanism 5 is used to record the attraction between the magnetic force-bearing block 9 and the magnet to be tested. The bottom of the attraction testing mechanism 5 is fixedly connected to the side of the base 1 away from the driving motor 3. The attraction testing mechanism 5 includes a protective shell 51. The top of the protective shell 51 is rotatably connected to a cover plate 52. The inner side of the protective shell 51 is rotatably connected to a turntable 53. The inner side of the turntable 53 is fixedly connected to a scale cylinder 55. The side of the scale cylinder 55 away from the turntable 53 is fixedly connected to a connecting seat 56. The center of the connecting seat 56 is rotatably connected to an auxiliary component 54. The inner side of the scale cylinder 55 is fixedly connected to a compression spring 57. The outer side of the compression spring 57 is fixedly connected to a dial plate 59. The side of the dial plate 59 close to the compression spring 57 is fixedly connected to a pull rod 58. The outer side of the auxiliary component 54 is fixedly connected to the inner side of the protective shell 51. The inner side of the dial plate 59 It is fixedly connected to the outer side of the scale cylinder 55, and the outer wall of the pull rod 58 is slidably connected to the inner wall of the scale cylinder 55. The end of the pull rod 58 away from the dial plate 59 is threadedly connected to the inner side of the threaded sleeve 11. When the drive motor 3 is started, its output end drives the screw rod 4 to rotate. Due to the threaded cooperation between the screw rod 4 and the displacement adjustment seat 61, the displacement adjustment seat 61 slides along the displacement guide rail 2 to the side away from the attraction testing mechanism 5. The displacement guide rail 2 is engraved with a distance scale for recording the sliding distance between the fixing mechanism 6 and the sliding seat 7. At this time, there is an attraction between the magnet to be tested and the magnetic force block 9, and the magnetic force block 9 drives the sliding seat 7 to slide on the displacement guide rail 2 through the mounting plate 8; at the same time, the sliding sleeve 10 and the threaded sleeve 11 on the outer side of the mounting plate 8 pull the pull rod 58, and the pull rod 58 pulls the dial plate 59, so that the dial plate 59 compresses the compression spring 57 on the inner side of the scale cylinder 55. The compression spring 57 is compressed to produce elastic deformation, and its elastic force is balanced with the attraction between the magnet to be tested and the magnetic force-bearing block 9. At this time, the compression amount of the compression spring 57 can be read by observing the position of the dial plate 59 on the outside of the scale cylinder 55. Since the elastic coefficient of the compression spring 57 is known, according to Hooke's law F=kx (where F is the spring force, k is the elastic coefficient, and x is the spring deformation), the attraction between the magnet to be tested and the magnetic force-bearing block 9 can be calculated. After one test is completed, the threaded sleeve 11 can be disconnected from the pull rod 58 by rotating it, and then the cover plate 52 on the top of the protective shell 51 is opened, and the connecting seat 56 is rotated to synchronously drive the scale cylinder 55 with the turntable 53 to move, thereby switching other components such as the scale cylinder 55 and the pull rod 58 relative to the position of the threaded sleeve 11. Multiple measurements can be performed to obtain multiple measurement data, and averaging them can effectively reduce the influence of random errors on the measurement results, so that the final attraction value is closer to the true value, thereby improving the accuracy of the measurement.

[0025] The auxiliary component 54 includes a fixed cylinder 541, the outer side of the fixed cylinder 541 is fixedly connected to a scale rod 542, the outer side of the scale rod 542 is slidably connected to a counting plate 544, the outer side of the counting plate 544 is fixedly connected to a connecting rod 545, and the end of the connecting rod 545 away from the counting plate 544 is fixedly connected to a reset plate 546, the outer side of the fixed cylinder 541 is fixedly connected to the inner side of the protective shell 51, the outer side of the fixed cylinder 541 is rotatably connected to the center of the connecting seat 56, the outer wall of the connecting rod 545 is fixedly connected to the inner wall of the fixed cylinder 541, the end of the scale rod 542 away from the fixed cylinder 541 is fixedly connected to the center of the rotating disk 53, and a scale groove 54 is opened in the wall of the scale rod 542. 3. When the dial plate 59 moves along the surface of the scale cylinder 55, it drives the counting plate 544 to slide along the surface of the scale rod 542 at the same time. The scale on the scale groove 543 opened on the surface of the scale rod 542 corresponds to the scale on the surface of the scale cylinder 55. As the magnet to be measured gradually moves away from the fixing mechanism 6, the attraction between the magnetic force block 9 and the magnet to be measured will gradually weaken. Finally, the compression spring 57 will drive the pull rod 58, the dial plate 59 and other components to reset. When the dial plate 59 is reset, it will be separated from the counting plate 544. At this time, the counting plate 544 can stay at the farthest scale position reached during its sliding process; the maximum compression amount of the compression spring 57 during this measurement process is recorded. Then, according to Hooke's law, the maximum attraction value between the two at this distance is accurately calculated, which provides key data for the subsequent analysis of the magnetic properties of the magnet to be measured. The operator does not need to pay attention to the movement process of the dial plate 59 in real time. After a measurement is completed, the operator only needs to directly read the scale where the counting plate 544 stops to obtain the measurement result. It has good intuitiveness and repeatability. After a test is completed, the staff can pull the reset plate 546 to reset the counting plate 544 to the side close to the fixed cylinder 541 through the connecting rod 545. During multiple measurements, each time the counting plate 544 can independently record the corresponding scale of the maximum attraction in each measurement process, it is convenient to compare and analyze multiple measurement results.

[0026] The fixing mechanism 6 includes a displacement adjustment seat 61, the top of the displacement adjustment seat 61 is fixedly connected to a mounting shell 62, the inner side of the mounting shell 62 is slidably connected to a clamping assembly 63, the top of the mounting shell 62 is fixedly connected to a limiting plate 64, the top of the limiting plate 64 is threadedly connected to a threaded rod 65, the bottom of the threaded rod 65 is rotatably connected to a pressing plate 66, the bottom of the displacement adjustment seat 61 is slidably connected to the outer side of the displacement guide rail 2, the inner side of the displacement adjustment seat 61 is threadedly connected to the outer wall of the screw rod 4, the outer side of the pressing plate 66 is slidably connected to the inner side of the limiting plate 64, when the magnet to be tested is fixed by the fixing mechanism 6, the magnet to be tested is placed on the clamping assembly 63 in the mounting shell 62, and then the threaded rod 65 at the top of the limiting plate 64 is rotated to move the pressing plate 66 downward, at this time, the pressing plate 66 can press the magnet to be tested against the stepped clamping seat 631 in the clamping assembly 63 to prevent the magnet from being displaced or shaken during the detection process, which affects the accuracy of the detection result.

[0027] The clamping assembly 63 includes a stepped clamping seat 631, the outer side of the stepped clamping seat 631 is fixedly connected to a limit slider 632, the inner side of the limit slider 632 is slidably connected to a T-shaped plate 633, the top of the T-shaped plate 633 is fixedly connected to a guide rod 635, the outer side of the guide rod 635 is fixedly connected to a buffer spring 636, the top of the buffer spring 636 is fixedly connected to a sliding block 637, the inner side of the limit slider 632 is fixedly connected to a spring piece 634, the outer side of the stepped clamping seat 631 is slidably connected to the inner side of the mounting shell 62, the limit slider 632 is slidably connected to a side of the mounting shell 62 close to the limit plate 64, the inner side of the sliding block 637 is connected to the outer wall of the guide rod 635 The sliding connection is that the outer side of the sliding block 637 is fixedly connected to the side of the pressure plate 66 close to the limit plate 64. When the pressure plate 66 moves downward, the sliding block 637 moves downward with the pressure plate 66, and presses the guide rod 635 downward through the buffer spring 636. At this time, the guide rod 635 can drive the T-shaped plate 633 to move downward. When the T-shaped plate 633 moves downward, its two sides slide along the sliding grooves opened in the wall of the limit slider 632. At this time, the two limit sliders 632 approach each other when the T-shaped plate 633 moves downward, forcing the spring piece 634 to be compressed, and driving the two stepped clamping seats 631 to approach each other, thereby laterally limiting the magnet to be tested.

[0028] Working principle: When in use, first fix the magnet to be tested through the fixing mechanism 6, then slide the sliding seat 7 along the displacement guide rail 2 on the top of the base 1 to the side close to the attraction test mechanism 5, and use the sliding sleeve 10 to make the threaded sleeve 11 sleeve on the outside of the pull rod 58, then fix it to the pull rod 58 by rotating the threaded sleeve 11, and then drive the lead screw 4 to rotate through the driving motor 3 to move the fixing mechanism 6, thereby changing the distance between the magnet to be tested and the magnetic force block 9 fixed on the top of the sliding seat 7 through the mounting plate 8. At this time, the attraction test mechanism 5 can be used to record the suction between the two, so as to realize the test of the magnetic properties of the NdFeB rare earth permanent magnet.

[0029] When the magnet to be tested is fixed by the fixing mechanism 6, the magnet to be tested is placed on the clamping assembly 63 in the mounting shell 62, and then the threaded rod 65 on the top of the limit plate 64 is rotated to move the pressure plate 66 downward. At this time, the pressure plate 66 can press the magnet to be tested and the stepped clamping seat 631 in the clamping assembly 63 to prevent the magnet from being displaced or shaken during the detection process, which affects the accuracy of the detection result.

[0030] When the pressure plate 66 moves downward, the sliding block 637 moves downward with the pressure plate 66, and presses the guide rod 635 downward through the buffer spring 636. At this time, the guide rod 635 can drive the T-shaped plate 633 to move downward. When the T-shaped plate 633 moves downward, its two sides slide along the sliding grooves opened in the wall of the limiting slider 632. At this time, the two limiting sliders 632 approach each other when the T-shaped plate 633 moves downward, forcing the spring piece 634 to be compressed and driving the two stepped clamping seats 631 to approach each other, thereby laterally limiting the magnet to be tested.

[0031] By setting up a pressure plate 66 and a stepped clamping seat 631 for use together, a stable and comprehensive fixing effect is provided for the magnet to be tested. The pressure plate 66 not only firmly presses the magnet in the vertical direction by its own downward pressure, ensuring that it will not be displaced due to vertical force during the detection process, but also can transmit pressure with the help of a linkage structure. The stepped design of the stepped clamping seat 631 can adapt to magnets of different shapes and sizes. By rationally utilizing the different positions of the steps on both sides, a full range of stable clamping can be achieved within the minimum moving distance. The special stepped shape is used to accurately limit the magnet in the horizontal direction, and the pressure can be evenly dispersed to avoid excessive local force. The synergistic effect of the two can effectively prevent the magnet from being displaced, shaken or deformed during detection, ensuring the high accuracy and reliability of the magnetic performance test results, and improving the versatility and stability of the test device.

[0032] When the driving motor 3 is started, its output end drives the lead screw 4 to rotate. Due to the threaded cooperation between the lead screw 4 and the displacement adjustment seat 61, the displacement adjustment seat 61 slides along the displacement guide rail 2 to the side away from the attraction testing mechanism 5. The displacement guide rail 2 is engraved with a distance scale for recording the sliding distance between the fixing mechanism 6 and the sliding seat 7. At this time, there is an attraction between the magnet to be tested and the magnetic force block 9. The magnetic force block 9 drives the sliding seat 7 to slide on the displacement guide rail 2 through the mounting plate 8.

[0033] At the same time, the sliding sleeve 10 and the threaded sleeve 11 on the outside of the mounting plate 8 pull the pull rod 58, and the pull rod 58 pulls the dial plate 59, so that the dial plate 59 compresses the compression spring 57 on the inside of the scale cylinder 55. The compression spring 57 is compressed to produce elastic deformation, and its elastic force is balanced with the attraction between the magnet to be measured and the magnetic force block 9. At this time, the compression amount of the compression spring 57 can be read by observing the position of the dial plate 59 on the outside of the scale cylinder 55. Since the elastic coefficient of the compression spring 57 is known, according to Hooke's law F=kx (where F is the spring force, k is the elastic coefficient, and x is the spring deformation), the attraction between the magnet to be measured and the magnetic force block 9 can be calculated.

[0034] After a test is completed, the threaded sleeve 11 can be rotated to disconnect it from the pull rod 58, and then the cover 52 on the top of the protective shell 51 can be opened, and the connecting seat 56 can be rotated to synchronously drive the scale cylinder 55 with the turntable 53 to move, thereby switching other components such as the scale cylinder 55 and the pull rod 58 to be relative to the position of the threaded sleeve 11. Multiple measurements can be performed to obtain multiple measurement data, and their average value can effectively reduce the influence of random errors on the measurement results, so that the final attraction value is closer to the true value, thereby improving the accuracy of the measurement.

[0035] By setting the auxiliary component 54, when the dial plate 59 moves along the surface of the scale cylinder 55, it drives the counting plate 544 to slide along the surface of the scale rod 542 at the same time. The scale on the scale groove 543 opened on the surface of the scale rod 542 corresponds to the scale on the surface of the scale cylinder 55. As the magnet to be tested gradually moves away from the fixing mechanism 6, the attraction between the magnetic force block 9 and the magnet to be tested will gradually weaken, and finally the compression spring 57 will drive the pull rod 58, the dial plate 59 and other components to reset. When the dial plate 59 is reset, it will be separated from the counting plate 544, and the counting plate 544 can stay at the farthest scale position reached during its sliding process; the maximum compression amount of the compression spring 57 during this measurement process is recorded. Then, according to Hooke's law, the maximum attraction value between the two at this distance is accurately calculated, which provides key data for the subsequent analysis of the magnetic properties of the magnet to be tested.

[0036] The operator does not need to pay attention to the movement process of the dial plate 59 in real time. After a measurement is completed, the operator can directly read the scale where the counting plate 544 stops to obtain the measurement result. It has good intuitiveness and repeatability. After a test is completed, the operator can pull the reset plate 546 to reset the counting plate 544 to the side close to the fixed cylinder 541 through the connecting rod 545. During multiple measurements, each time the counting plate 544 can independently record the corresponding scale of the maximum attraction in each measurement process, which is convenient for comparison and analysis of multiple measurement results.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A NdFeB rare earth permanent magnet magnetic property testing device, characterized in that: include: A base (1), wherein the top of the base (1) is symmetrically fixedly connected to a displacement guide rail (2), the outer side of the base (1) is fixedly connected to a drive motor (3), the output end of the drive motor (3) is fixedly connected to a lead screw (4), the outer side of the lead screw (4) is threadedly connected to a fixing mechanism (6), the outer side of the displacement guide rail (2) is slidably connected to a sliding seat (7), the top of the sliding seat (7) is fixedly connected to a mounting plate (8), the top of the mounting plate (8) is fixedly connected to a magnetic force block (9), the outer side of the mounting plate (8) is slidably connected to a sliding sleeve (10), and the inner side of the sliding sleeve (10) is rotatably connected to a threaded sleeve (11); An attraction force testing mechanism (5), the attraction force testing mechanism (5) being used to record the attraction force between the magnetic force bearing block (9) and the magnet to be tested, the bottom of the attraction force testing mechanism (5) being fixedly connected to a side of the base (1) away from the drive motor (3), the attraction force testing mechanism (5) comprising a protective shell (51), the top of the protective shell (51) being rotatably connected to a cover plate (52), the inner side of the protective shell (51) being rotatably connected to a turntable (53), the inner side of the turntable (53) being fixedly connected to a graduated cylinder (55), the side of the graduated cylinder (55) away from the turntable (53) being fixedly connected to a connecting seat (56), the center of the connecting seat (56) being rotatably connected to an auxiliary component (54), the inner side of the graduated cylinder (55) being fixedly connected to a compression spring (57), the outer side of the compression spring (57) being fixedly connected to a dial plate (59), and the side of the dial plate (59) close to the compression spring (57) being fixedly connected to a pull rod (58); The auxiliary component (54) comprises a fixed cylinder (541), a scale rod (542) is fixedly connected to the outside of the fixed cylinder (541), a counting plate (544) is slidably connected to the outside of the scale rod (542), a connecting rod (545) is fixedly connected to the outside of the counting plate (544), and a reset plate (546) is fixedly connected to one end of the connecting rod (545) away from the counting plate (544).

2. The NdFeB rare earth permanent magnet magnetic property testing device according to claim 1, characterized in that: The two ends of the screw rod (4) of the base (1) are rotatably connected to the top of the base (1), the bottom of the fixing mechanism (6) is slidably connected to the outer side of the displacement guide rail (2), and the side of the base (1) away from the drive motor (3) is fixedly connected to the top of the protective shell (51).

3. The NdFeB rare earth permanent magnet magnetic property testing device according to claim 1, characterized in that: The outer side of the auxiliary component (54) is fixedly connected to the inner side of the protective shell (51), the inner side of the dial plate (59) is fixedly connected to the outer side of the scale cylinder (55), the outer wall of the pull rod (58) is slidably connected to the inner wall of the scale cylinder (55), and one end of the pull rod (58) away from the dial plate (59) is threadedly connected to the inner side of the threaded sleeve (11).

4. The NdFeB rare earth permanent magnet magnetic property testing device according to claim 1, characterized in that: The outer side of the fixed cylinder (541) is fixedly connected to the inner side of the protective shell (51), the outer side of the fixed cylinder (541) is rotatably connected to the center of the connecting seat (56), the outer wall of the connecting rod (545) is fixedly connected to the inner wall of the fixed cylinder (541), one end of the scale rod (542) away from the fixed cylinder (541) is fixedly connected to the center of the rotating disk (53), and a scale groove (543) is provided in the wall of the scale rod (542).

5. The NdFeB rare earth permanent magnet magnetic property testing device according to claim 1, characterized in that: The fixing mechanism (6) comprises a displacement adjustment seat (61), the top of the displacement adjustment seat (61) is fixedly connected to a mounting shell (62), the inner side of the mounting shell (62) is slidably connected to a clamping assembly (63), the top of the mounting shell (62) is fixedly connected to a limit plate (64), the top of the limit plate (64) is threadedly connected to a threaded rod (65), and the bottom of the threaded rod (65) is rotatably connected to a pressing plate (66).

6. The NdFeB rare earth permanent magnet magnetic property testing device according to claim 5, characterized in that: The bottom of the displacement adjustment seat (61) is slidably connected to the outer side of the displacement guide rail (2), the inner side of the displacement adjustment seat (61) is threadedly connected to the outer wall of the screw rod (4), and the outer side of the pressure plate (66) is slidably connected to the inner side of the limit plate (64).

7. The NdFeB rare earth permanent magnet magnetic property testing device according to claim 5, characterized in that: The clamping assembly (63) comprises a stepped clamping seat (631), the outer side of the stepped clamping seat (631) is fixedly connected to a limiting slider (632), the inner side of the limiting slider (632) is slidably connected to a T-shaped plate (633), the top of the T-shaped plate (633) is fixedly connected to a guide rod (635), the outer side of the guide rod (635) is fixedly connected to a buffer spring (636), the top of the buffer spring (636) is fixedly connected to a sliding block (637), and the inner side of the limiting slider (632) is fixedly connected to a spring sheet (634).

8. The NdFeB rare earth permanent magnet magnetic property testing device according to claim 7, characterized in that: The outer side of the stepped clamping seat (631) is slidably connected to the inner side of the mounting shell (62), the limiting slider (632) is slidably connected to a side of the mounting shell (62) close to the limiting plate (64), the inner side of the sliding block (637) is slidably connected to the outer wall of the guide rod (635), and the outer side of the sliding block (637) is fixedly connected to a side of the pressure plate (66) close to the limiting plate (64).

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