Magnetic particle transport device

Abstract

This invention discloses a magnetic sheet feeding device, relating to the field of automated magnetic material conveying technology. The key technical features include a feeding hopper, a first conveying channel, a second conveying channel, and a vibration device. The first conveying channel is sequentially equipped with a thickness detection module, a magnetic pole detection module, and a corresponding pneumatic rejection module, used to identify and reject magnetic sheets with abnormal thickness and magnetic pole orientation, respectively. The second conveying channel is equipped with a vibration device for recovering rejected magnetic sheets and refeeding them. A vibration isolation structure or independent support structure is provided between the first and second conveying channels to physically isolate the detection path and the recovery path, effectively blocking vibration interference, improving the accuracy and stability of magnetic sheet thickness and magnetic pole orientation identification, and enhancing feeding efficiency and automation level.

Description

Technical Field

[0001] This invention relates to the field of automated conveying technology for magnetic materials, and in particular to a magnetic sheet feeding device. Background Technology

[0002] Vibratory feeder systems, as core components in automated production, are widely used in the electronics, automotive, and semiconductor industries for the directional transport of magnetic components. They utilize high-frequency vibration and a track-guided structure to arrange and transport randomly arranged magnetic sheets to the target workstation. However, in magnetic sheet loading, especially in high-precision magnetization processes, the dynamic matching between the vibratory feeder and the magnetic sheet-track system remains a key technical bottleneck affecting stability.

[0003] In existing technologies, vibratory feeders typically employ fixed-frequency electromagnetic drive devices (such as single-phase or three-phase vibratory motors), with amplitude control achieved by adjusting the supply voltage or a mechanical eccentric block. However, the diversity of magnetic sheet materials (such as neodymium iron boron, ferrite, etc.) and differences in physical properties (mass, size, internal hole structure) can lead to significant variations in the overall dynamic characteristics of the system. For example:

[0004] Resonance triggering mechanism: When the vibration frequency is close to the natural frequency of the magnetic sheet-track system, mechanical resonance is easily induced, which manifests as abnormal jumping, rotation or even flying off the track during transmission, disrupting the consistency of the directional arrangement.

[0005] Existing suppression methods are insufficient: traditional solutions often rely on empirical trial and error.

[0006] Frequency fine-tuning: Manually adjust the operating frequency of the vibration motor to avoid sensitive frequency bands, but the dynamic adaptability is poor and it cannot cope with the fluctuation of batch material parameters.

[0007] Structural reinforcement: Increasing the thickness of the track or the stiffness of the support components can raise the natural frequency, but it leads to an increase in equipment size and energy consumption, and has limited effect on suppressing resonance of lightweight magnetic sheets.

[0008] Damping and vibration reduction: Adding rubber pads or hydraulic dampers can weaken the transmission of high-frequency vibrations, but the attenuation efficiency for low-frequency resonance (20-50Hz) is insufficient, and the performance will be further reduced due to material aging after long-term use. Summary of the Invention

[0009] The purpose of this invention is to provide a magnetic sheet feeding device. This device has a reasonable structure, which can effectively avoid resonance interference from the vibratory feeder in the detection process. At the same time, it has the ability to automatically recover and reuse magnetic sheets that fail to enter the detection channel correctly, thereby improving the stability, yield and automation level of the feeding system.

[0010] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0011] A magnetic sheet feeding device, comprising:

[0012] The system includes a feeding hopper, a first conveying channel, and a second conveying channel. The first conveying channel is provided below the discharge port of the feeding hopper. The first conveying channel is sequentially equipped with: a thickness detection module for detecting the thickness of the magnetic sheet, a magnetic pole detection module for detecting the magnetic pole direction of the magnetic sheet, and at least two pneumatic rejection modules, a first pneumatic rejection module and a second pneumatic rejection module, which are respectively electrically connected to the thickness detection module and the magnetic pole detection module. The first pneumatic rejection module is used to reject magnetic sheets with abnormal thickness, and the second pneumatic rejection module is used to reject magnetic sheets with abnormal magnetic pole direction.

[0013] A vibration device is installed on the conveying path of the second conveying channel. The vibration device is used to receive the magnetic sheet of the second conveying channel and supply it again to the lower side of the discharge port of the feeding funnel.

[0014] A vibration isolation structure located between the first and second conveying channels, or an independent support structure located on the first and second conveying channels respectively, is used to physically isolate the recovery route of the second conveying channel from the detection route of the first conveying channel, so as to avoid vibration interference with the magnetic pole identification process.

[0015] Further features include a vibration isolation structure, which comprises a vibration isolation cavity and an elastic buffer layer disposed between the vibration isolation cavity and the vibration device.

[0016] The resonant frequency of the vibration isolation cavity is offset from the excitation frequency of the vibration device, which is used to form a notch point within the target frequency range, block the resonant coupling path, and suppress the propagation of vibration energy to the detection path.

[0017] Further configuration: The vibration isolation cavity includes two or more resonant cavity units with different structural parameters. The multiple resonant cavity units have different resonant frequencies, which are used to form acoustic notches at multiple frequency points, thereby simultaneously suppressing the vibration transmission of the main frequency band and its harmonic frequency band of the excitation frequency.

[0018] Further setting: the difference between the resonant frequency of the vibration isolation cavity and the excitation frequency of the vibration device is ≥ 30% of the excitation frequency.

[0019] Further configuration: The vibration isolation cavity is provided with at least one reflective baffle, which is disposed in the sound wave propagation path to guide the sound wave to reflect multiple times and extend the propagation path.

[0020] Further configuration: The reflective partition is arranged in a stepped, sawtooth, or zigzag pattern.

[0021] Further configuration: The vibration isolation cavity is also provided with a sound-absorbing material layer, which is a honeycomb, porous foam or fiber felt structure, covering the inner wall of the vibration isolation cavity and the surface of the reflective partition.

[0022] Further configuration: The vibration isolation structure is an independent modular structure that can be detachably installed on the first conveying channel and between the second conveying channel.

[0023] Further configuration: The first conveying channel is provided with a guide side plate and a wedge-shaped guide block located on the conveying path, and the wedge-shaped guide block and the guide side plate are provided with a gap for a single magnetic sheet to pass through.

[0024] Further configuration: The wedge-shaped guide block has a guide surface that is inclined upstream, and the highest point of the guide surface is at least higher than the height of the guide side plate.

[0025] In summary, the present invention has the following beneficial effects:

[0026] First, in this invention, by setting a vibration isolation structure or separate support structures between the first and second conveying channels, the recovery path where the vibration device is located is physically isolated from the detection path where the detection module is located. This structurally blocks the propagation path of excitation energy, significantly reducing interference from the vibratory feeder during operation on precision detection processes such as magnetic pole identification and thickness identification, effectively suppressing resonance interference, and improving detection stability. Furthermore, the second conveying channel is connected to the vibration device, which can refeed the magnetic sheets in the recovery path to below the discharge port. Magnetic sheets with incorrect orientation or those not detected can automatically return, achieving automatic return circulation of the magnetic sheets without manual intervention or refeeding, thus improving feeding efficiency.

[0027] Secondly, in this invention, the vibration isolation structure connects the first and second conveying channels but does not transmit vibration. By utilizing the "non-coincidence" between the natural frequency of the vibration isolation structure and the excitation frequency, energy resonance transmission is avoided. Specifically, through the vibration isolation cavity designed based on the Helmholtz resonance principle, a notch point is formed within the target frequency range, which can effectively attenuate the mechanical wave energy of the excitation frequency of the vibration device and its adjacent frequency bands, actively constructing a "spectral blocking band" and significantly suppressing specific frequencies that are not desired to propagate in the resonance transmission path.

[0028] Because the vibration device experiences periodic excitation during operation, and the accuracy of the detection path in identifying the magnetic pole direction and thickness depends on minute fluctuations in electrical signals, misidentification or rejection errors are highly likely to occur without isolation. This vibration isolation structure can significantly reduce the possibility of excitation signals entering the detection path, thereby reducing the risk of misidentification from the source and improving the accuracy and stability of the detection.

[0029] Third, in this invention, the vibration source in the magnetic sheet feeding system, in addition to the main excitation frequency, typically generates higher-order harmonic components such as 2f and 3f, posing a potential threat to the accuracy of magnetic pole identification. By setting two or more resonant cavity units with different structural parameters in the vibration isolation cavity, and by introducing multiple resonant cavity units, each cavity forms a strong notch effect in its corresponding frequency range. The multiple cavities work together to form energy absorption regions at different frequency points, constructing a wide-band attenuation band, effectively shielding the main excitation frequency and its higher-order harmonics.

[0030] Fourth, in this invention, at least one reflective baffle is provided inside the vibration isolation cavity. The reflective baffle is located in the sound wave propagation path and is used to guide the sound wave to reflect multiple times within the cavity. The reflective baffle forms a folding, multi-path propagation structure, which effectively increases the "effective length" of the cavity, equivalent to extending the phase delay interval of the sound wave. This enhances the coupling and interference cancellation capability for low-frequency vibrations without significantly increasing the cavity volume, and improves the low-frequency notch depth. The sound waves superimposed after multiple reflections form phase interference and standing wave modes within the cavity. Through structural optimization, the destructive region at the target frequency can be enhanced, forming a steeper notch attenuation curve, effectively suppressing the coupled propagation of vibration energy at specific frequencies.

[0031] Fifth, in this invention, a sound-absorbing material layer is disposed within the vibration isolation cavity. This layer employs a honeycomb, porous foam, or fiber felt structure, forming numerous open microcavities through its porous microstructure. During sound wave propagation, multiple viscous frictions and heat dissipation occur, significantly absorbing mid-to-high frequency sound energy, particularly effectively attenuating high-order harmonic components of the excitation frequency of the vibration device, thus improving the system's full-frequency vibration isolation performance. The sound-absorbing material and the vibration isolation cavity work together to achieve a slow and continuous frequency roll-off characteristic outside the target frequency band, enabling the system to overcome its sensitivity to a single frequency point and possess overall suppression capability across a frequency bandwidth, thus solving the problem of actual vibration frequency drift or variation.

[0032] The sound-absorbing material layer covering the reflective baffle and the inner wall of the cavity helps to suppress the continuous reflection of sound waves and the enhancement of standing waves in the cavity, reduce the unexpected resonance peak caused by uneven cavity size or multi-cavity coupling, and improve the stability and consistency of acoustic notch waves.

[0033] Sixth, in this invention, the gap between the wedge-shaped guide block and the guide side plate is precisely set according to the size of the magnetic sheet, allowing only one magnetic sheet in the correct direction to pass through, effectively preventing magnetic sheets from overlapping, tilting, or misaligning into the detection channel. The guide surface is designed with an upstream inclined structure, which can lift locally stacked or adhered magnetic sheets under the reaction force in the conveying direction and force them to slide into the second conveying channel for recycling, realizing passive physical segmentation and attitude correction, reducing the system burden caused by manual preprocessing or complex mechanisms. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the magnetic sheet feeding device;

[0035] Figure 2 This is a schematic diagram of the magnetic sheet conveying path of the magnetic sheet feeding device;

[0036] Figure 3 This is a side view of the magnetic sheet feeding device with vibration isolation structure;

[0037] Figure 4 This is a schematic diagram of a vibration isolation structure;

[0038] Figure 5 This is a side view of the magnetic sheet feeding device with an independent support structure.

[0039] In the diagram, 100 is the feeding funnel; 101 is the discharge port.

[0040] 200. First conveying channel; 300. Second conveying channel; 301. Vibration device;

[0041] 401. Magnetic pole detection module; 402. Thickness detection module; 403. First pneumatic rejection module; 404. Second pneumatic rejection module;

[0042] 500, wedge-shaped guide block; 501, guide surface; 600, guide side plate;

[0043] 700. Vibration isolation structure; 701. Vibration isolation cavity; 702. Elastic buffer layer; 703. Reflective partition; 704. Sound-absorbing material layer;

[0044] 800. Independent support structure. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the accompanying drawings.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] A magnetic sheet feeding device, such as Figure 1 and Figure 2As shown, the device includes a feeding hopper 100, a first conveying channel 200, and a second conveying channel 300. The discharge port 101 of the feeding hopper 100 is located above the device, and the first conveying channel 200 and the second conveying channel 300 are provided below the discharge port 101. The first conveying channel 200 and the second conveying channel 300 are arranged in the same direction and are used for the detection and recycling of magnetic sheets, respectively.

[0048] The first conveying channel 200 is equipped with a thickness detection module 402 and a magnetic pole detection module 401 sequentially along the conveying direction of the magnetic sheet. The thickness detection module 402 is used to detect the thickness parameters of the magnetic sheet, and the magnetic pole detection module 401 is used to identify the magnetic pole direction of the magnetic sheet. Downstream of the above two detection modules, a first pneumatic rejection module 403 and a second pneumatic rejection module 404 are respectively provided. The first pneumatic rejection module 403 is connected to the thickness detection module 402 by an electrical signal and is used to reject magnetic sheets with abnormal thickness from the conveying path. The second pneumatic rejection module 404 is also connected to the magnetic pole detection module 401 by an electrical signal and is used to reject magnetic sheets with abnormal magnetic pole direction, ensuring that the quality of the magnetic sheets entering the subsequent process is qualified.

[0049] The second conveying channel 300 is located on one side of the first conveying channel 200, and a vibration device 301 is provided on its conveying path to receive magnetic sheets that are rejected from the first conveying channel 200 or fail to enter the first conveying channel 200 correctly. The device then guides the magnetic sheets back to the discharge port 101 of the feeding funnel 100 through vibration, so that they re-enter the feeding cycle, thereby realizing the automatic recycling and re-inspection of the magnetic sheets.

[0050] The specific structural forms of the first conveying channel 200 and the second conveying channel 300 are not limited. In this embodiment, a conveyor belt structure is preferred to achieve smooth movement and continuous transmission of the magnetic sheets during the conveying process. In addition, the conveying channels can also adopt linear module conveying structures, sliding rail structures, chain conveying structures, etc., to adapt to the feeding rhythm and structural layout requirements in different scenarios.

[0051] To prevent the high-frequency vibration generated by the vibration device 301 during operation from being transmitted upward to the first conveying channel 200, thereby affecting the accuracy of thickness detection or magnetic pole identification, a vibration isolation structure 700 is provided between the first conveying channel 200 and the second conveying channel 300 to physically isolate the detection route from the recovery route and avoid vibration interference with the magnetic pole identification process.

[0052] The specific structural form of the vibration device 301 is not limited. In this embodiment, an electromagnetic vibrator structure is preferred. This structure generates a periodic magnetic field by controlling an electromagnetic coil, thereby driving the supporting platform to generate high-frequency micro-amplitude vibration, which is used to rearrange the recovered magnetic sheets and guide them to the lower side of the feeding funnel 100. In addition, the vibration device 301 can also adopt other types of structures such as an eccentric motor drive structure, a piezoelectric vibration structure, a pneumatic vibration mechanism, or a mechanical spring vibration platform. The specific form can be selected and optimized according to the required vibration frequency, amplitude, and structural space to meet the needs of different recycling rhythms and feeding efficiencies, and to achieve effective sorting and refeeding of the magnetic sheets.

[0053] Based on the above embodiments, as a further limiting technical solution, such as Figure 3 and Figure 4 As shown, the vibration isolation structure 700 in the magnetic sheet feeding device specifically includes a vibration isolation cavity 701 disposed between the first conveying channel 200 and the second conveying channel 300, and an elastic buffer layer 702 located between the vibration isolation cavity 701 and the lower vibration device 301. The elastic buffer layer 702 is in direct contact with the vibration device 301, playing a role in initially attenuating vibration energy, while also providing flexible support for the vibration cavity.

[0054] The specific structural form of the elastic buffer layer 702 is not limited. In this embodiment, a rubber damping pad structure is preferred, as this structure has good compressibility and energy absorption performance, effectively isolating vibration paths. In addition, the elastic buffer layer 702 can also adopt other types of structures such as spring damping components, bellows support structures, foam plastic pads, silicone buffer blocks, or airbag-type elastic support devices. The materials and forms can be flexibly selected according to the vibration frequency, load requirements, and structural space conditions to achieve reliable buffering and vibration isolation support for the vibration isolation cavity 701.

[0055] The vibration isolation cavity 701 is typically located below the first conveying channel 200 or in the middle between the two channels, and is connected to the elastic buffer layer 702. The resonant frequency of this vibration isolation cavity 701 is offset from the excitation frequency of the vibration device 301, thereby forming an acoustic notch within a preset target frequency range, effectively blocking the resonant coupling path of the excitation frequency and its nearby frequency bands in the structure. This structural arrangement significantly suppresses the upward propagation of vibration energy generated by the vibration device 301 to the detection path of the first conveying channel 200, thereby improving the operational stability and identification accuracy of the thickness detection module 402 and the magnetic pole detection module 401 under high-precision conditions.

[0056] The structural parameters of the vibration isolation cavity 701 are optimized to create a significant frequency misalignment between its resonant frequency and the excitation frequency of the vibration device 301. Specifically, the difference between the resonant frequency of the vibration isolation cavity 701 and the excitation frequency of the vibration device 301 is no less than 30% of the excitation frequency. This frequency deviation helps to effectively avoid the resonance range corresponding to the excitation frequency in the structural system, thereby forming a stable non-resonant band on the propagation path. This further suppresses the structural coupling propagation of vibration energy from the vibration device 301 to the detection path, improving the overall anti-interference capability and detection stability of the feeding device.

[0057] Based on the above embodiments, as a further limiting embodiment, such as... Figure 4 As shown, the vibration isolation cavity 701 contains two or more resonant cavity units. These units are arranged sequentially along the sound wave propagation path of the vibration isolation cavity 701 and each has different structural parameters, thus giving it different resonant frequencies. This multi-unit frequency-shifting combination structure can create acoustic notches at multiple desired frequency points, effectively weakening the sound wave energy transmission at the corresponding frequencies. This not only significantly suppresses the vibration in the main frequency band corresponding to the excitation frequency of the vibration device 301 but also simultaneously attenuates the energy propagation of its higher-order harmonic frequencies, further improving the suppression range and effect on vibration interference along the detection path.

[0058] Based on the above embodiments, as a further limiting embodiment, such as... Figure 4 As shown, at least one reflective baffle 703 is disposed inside the vibration isolation cavity 701. The reflective baffle 703 is arranged in the sound wave propagation path to change the propagation direction of the sound wave, causing the sound wave to be reflected multiple times within the vibration isolation cavity 701, thereby significantly extending its propagation path, increasing the sound energy dissipation process, and enhancing the ability to attenuate vibration energy. The reflective baffle 703 can be arranged in a stepped, sawtooth, or zigzag pattern according to the cavity structure, further enhancing the complexity and irregularity of the sound wave reflection path, which helps to improve the interference attenuation efficiency of the sound wave, and when used in conjunction with the sound-absorbing material layer 704, it synergistically improves the overall vibration isolation performance.

[0059] Based on the above embodiments, as a further limiting embodiment, such as... Figure 4As shown, the vibration isolation cavity 701 is equipped with a sound-absorbing material layer 704, which has a honeycomb, porous foam, or fiber felt structure. This sound-absorbing material layer 704 covers the inner wall surface of the vibration isolation cavity 701 and the surface of the reflective baffle 703, forming an effective sound wave absorption area, thereby further improving the vibration isolation effect of the vibration isolation cavity 701. The sound-absorbing material layer 704 is tightly bonded to the inner wall of the vibration isolation cavity 701 and the reflective baffle 703, ensuring the stability of the structure and the durability of its acoustic performance. Through this arrangement, the sound-absorbing material layer 704 can effectively block and attenuate noise transmitted into the vibration isolation cavity 701, improving the detection accuracy and stability of the entire device.

[0060] The specific structure of the sound-absorbing material layer 704 is not limited. In this embodiment, a honeycomb sound-absorbing structure is preferred, as this structure possesses a dual sound energy attenuation mechanism of multi-faceted reflection and pore absorption. Alternatively, a porous foam structure, such as polyurethane foam or phenolic foam, or a fiber felt structure, such as fiberglass felt or polyester fiber felt, can also be used. The shape, material, and thickness of the sound-absorbing material layer 704 can be selected and optimized according to the target frequency range, cavity structure size, and noise characteristics of the operating environment to achieve ideal vibration isolation and noise reduction effects.

[0061] Based on the above embodiments, as a further limiting embodiment, such as... Figure 4 As shown, the vibration isolation structure 700 is an independent modular structure, detachably installed on the first conveying channel 200 and between the second conveying channel 300. Adopting an independent modular design, the overall structure is detachable, facilitating installation and maintenance. The modular parallel arrangement allows for flexible adjustment of the number of cavities and parameter combinations based on the characteristics of the vibration source, thereby meeting the suppression requirements of spectral energy distribution characteristics in different application scenarios. It possesses good scalability and engineering adaptability.

[0062] Based on the above embodiments, as a further limiting embodiment, such as... Figure 1 and Figure 2 As shown, the first conveying channel 200 is provided with guide side plates 600 and wedge-shaped guide blocks 500 arranged on the conveying path in sequence along its conveying path. The wedge-shaped guide blocks 500 are disposed between the guide side plates 600, forming an interval channel for a single magnetic sheet to pass through, thereby limiting and guiding the movement direction of the magnetic sheet. The wedge-shaped guide block 500 has a guide surface 501 that is inclined towards the upstream direction. The highest point of the guide surface 501 is above the height of the guide side plate 600. The height design of the guide surface 501 is superior to that of the guide side plate 600, which is beneficial for effectively guiding and limiting the magnetic sheets from the upstream, preventing multiple sheets from overlapping or deviating into the detection path.

[0063] In the operation of this invention, the magnetic sheet is first fed into the feeding funnel 100, and the discharge port 101 of the feeding funnel 100 is opened. Under the action of gravity, the magnetic sheet falls from the discharge port 101 of the feeding funnel 100 into the first conveying channel 200 below it. The path of the first conveying channel 200 has a wedge-shaped guide block 500. The gap between the wedge-shaped guide block 500 and the guide side plate 600 is precisely set according to the size of the magnetic sheet, allowing only one magnetic sheet in the correct direction to pass through, which can effectively prevent the magnetic sheets from overlapping, tilting or misaligning into the detection channel. The guide surface 501 is designed with an upstream inclined structure, which can lift up partially stacked or adhered magnetic sheets under the reaction force in the conveying direction and force them to slide into the second conveying channel 300 for recycling.

[0064] Next, the first conveying channel 200 sequentially conveys the magnetic sheets to the thickness detection module 402 and the magnetic pole detection module 401 along the conveying path, where the thickness and magnetic pole orientation of the magnetic sheets are detected online, respectively. When the detection results are abnormal, the magnetic sheets with abnormal thickness are rejected by the first pneumatic rejection module 403 located downstream of the thickness detection module 402, and the magnetic sheets with abnormal magnetic pole orientation are rejected by the second pneumatic rejection module 404 located downstream of the magnetic pole detection module 401, ensuring that the magnetic sheets entering subsequent processes meet the process requirements.

[0065] For the rejected abnormal magnetic sheets, the pneumatic rejection module blows them into the second conveying channel 300, where the vibration device 301 rearranges the recovered magnetic sheets and makes them fall back to the lower area of ​​the feeding funnel 100 for re-detection and rearrangement.

[0066] refer to Figure 5 As an alternative implementation, the vibration isolation structure 700 is eliminated, and independent support structures 800 are respectively set below the first conveying channel 200 and the second conveying channel 300 to physically isolate the detection route and the recovery route, so as to avoid vibration interference with the magnetic pole identification process.

[0067] The above embodiments are merely explanations of the present invention and are not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A magnetic sheet feeding device, characterized in that, include: The material is provided with a feeding hopper (100), a first conveying channel (200), and a second conveying channel (300). The first conveying channel (200) and the second conveying channel (300) are provided below the discharge port (101) of the feeding hopper (100). The first conveying channel (200) is provided with the following components in sequence: a thickness detection module (402) for detecting the thickness of the magnetic sheet, a magnetic pole detection module (401) for detecting the magnetic pole direction of the magnetic sheet, and at least two pneumatic rejection modules (403) and a second pneumatic rejection module (404) that are electrically connected to the thickness detection module (402) and the magnetic pole detection module (401), respectively. The first pneumatic rejection module (403) is used to reject magnetic sheets with abnormal thickness, and the second pneumatic rejection module (404) is used to reject magnetic sheets with abnormal magnetic pole direction. A vibration device (301) is provided on the conveying path of the second conveying channel (300). The vibration device (301) is used to receive the magnetic sheet of the second conveying channel (300) and supply it again to the lower side of the discharge port (101) of the feeding funnel (100). A vibration isolation structure (700) located between the first conveying channel (200) and the second conveying channel (300) or an independent support structure (800) located on the first conveying channel (200) and the second conveying channel (300) respectively, is used to physically isolate the recovery route of the second conveying channel (300) from the detection route of the first conveying channel (200) to avoid vibration interference with the magnetic pole identification process.

2. The magnetic sheet feeding device according to claim 1, characterized in that: It includes a vibration isolation structure (700), which includes a vibration isolation cavity (701) and an elastic buffer layer (702) disposed between the vibration isolation cavity (701) and the vibration device (301); The resonant frequency of the vibration isolation cavity (701) is offset from the excitation frequency of the vibration device (301) to form a notch point within the target frequency range, block the resonant coupling path, and suppress the propagation of vibration energy to the detection path.

3. The magnetic sheet feeding device according to claim 2, characterized in that: The vibration isolation cavity (701) includes two or more resonant cavity units with different structural parameters. The multiple resonant cavity units have different resonant frequencies, which are used to form acoustic notches at multiple frequency points, thereby simultaneously suppressing the vibration transmission of the main frequency band and its harmonic frequency band of the excitation frequency.

4. The magnetic sheet feeding device according to claim 2, characterized in that: The difference between the resonant frequency of the vibration isolation cavity (701) and the excitation frequency of the vibration device (301) is ≥ 30% of the excitation frequency.

5. The magnetic sheet feeding device according to any one of claims 2-4, characterized in that: The vibration isolation cavity (701) is provided with at least one reflective baffle (703), which is disposed in the sound wave propagation path to guide the sound wave to reflect multiple times and extend the propagation path.

6. The magnetic sheet feeding device according to claim 5, characterized in that: The reflective partition (703) is arranged in a stepped, sawtooth, or zigzag pattern.

7. The magnetic sheet feeding device according to claim 5, characterized in that: The vibration isolation cavity (701) is also provided with a sound-absorbing material layer (704), which is a honeycomb, porous foam or fiber felt structure, covering the inner wall of the vibration isolation cavity (701) and the surface of the reflective partition (703).

8. The magnetic sheet feeding device according to claim 1, characterized in that: The vibration isolation structure (700) is an independent modular structure that can be detachably installed on the first conveying channel (200) and between the second conveying channel (300).

9. The magnetic sheet feeding device according to claim 1, characterized in that: The first conveying channel (200) is provided with a guide side plate (600) and a wedge-shaped guide block (500) located on the conveying path. The wedge-shaped guide block (500) and the guide side plate (600) are provided with a gap for a single magnetic sheet to pass through.

10. The magnetic sheet feeding device according to claim 9, characterized in that: The wedge-shaped guide block (500) has a guide surface (501) that is inclined upstream, and the highest point of the guide surface (501) is at least higher than the height of the guide side plate (600).

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