Magnetic sheet feeding device

Abstract

The invention discloses a magnetic sheet feeding device, and relates to the technical field of magnetic material automatic conveying, and the magnetic sheet feeding device is characterized by comprising a blanking funnel, a first conveying channel, a second conveying channel and a vibration device, the first conveying channel is sequentially provided with a thickness detection module, a magnetic pole detection module and a corresponding pneumatic rejection module, and the second conveying channel is provided with a magnetic pole detection module; the magnetic sheet recognition module is used for recognizing and removing magnetic sheets with abnormal thickness and magnetic pole direction; the second conveying channel is provided with a vibration device used for recycling and removing the magnetic sheets and feeding the magnetic sheets again. A vibration isolation structure or an independent support structure is arranged between the first conveying channel and the second conveying channel, physical isolation of a detection path and a recovery path is achieved, vibration interference is effectively blocked, the precision and stability of magnetic sheet thickness and magnetic pole direction recognition are improved, and the feeding efficiency and the automation level are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automated transportation of magnetic materials, and particularly to a magnetic sheet feeding device. Background Art

[0002] As a core component in automated production, the vibratory bowl feeding system is widely used in the directional transportation of magnetic components in the electronics, automotive, and semiconductor industries. Through high-frequency vibration and track guiding structures, it arranges and transports disordered magnetic sheets in an orderly manner to the target workstations. However, in the process of magnetic sheet feeding, especially in high-precision magnetization processes, the dynamic matching problem between the vibratory bowl and the magnetic sheet-rail system has always been a key technical bottleneck affecting stability.

[0003] In the prior art, vibratory bowls usually adopt electromagnetic drive devices with fixed frequencies (such as single-phase or three-phase vibratory motors), and amplitude control is achieved by adjusting the supply voltage or mechanical eccentric blocks. However, the diversity of magnetic sheet materials (such as neodymium iron boron, ferrite, etc.) and differences in physical properties (mass, size, inner hole structure) will cause significant changes in the overall dynamic characteristics of the system. For example: Resonance triggering mechanism: When the vibration frequency approaches the natural frequency of the magnetic sheet-rail system, mechanical resonance is easily induced, manifested as abnormal jumping, rotation, or even flying out of the track of the magnetic sheet during transmission, destroying the consistency of the directional arrangement.

[0004] Insufficiency of existing suppression means: Traditional solutions mostly rely on empirical trial-and-error methods: Frequency fine-tuning: Manually adjust the operating frequency of the vibratory motor to avoid sensitive frequency bands, but the dynamic adaptability is poor and it cannot cope with fluctuations in batch material parameters.

[0005] Structure strengthening: Increasing the track thickness or the stiffness of the support members can increase the natural frequency, but it leads to an increase in the volume and energy consumption of the equipment, and the resonance suppression effect on lightweight magnetic sheets is limited.

[0006] Damping and shock absorption: Installing rubber pads or hydraulic buffers can weaken the transmission of high-frequency vibrations, but the attenuation efficiency for low-frequency resonance (20 - 50 Hz) is insufficient, and material aging after long-term use will further reduce the performance. Summary of the Invention

[0007] The purpose of the present invention is to provide a magnetic sheet feeding device with a reasonable structure, which can effectively avoid resonance interference of the vibratory bowl on the detection process, and at the same time has the ability to automatically recycle and reuse magnetic sheets that fail to enter the detection channel correctly, thereby improving the stability, yield, and automation level of the feeding system.

[0008] The above technical purpose of the present invention is achieved through the following technical solutions: A magnetic sheet feeding device, comprising: A blanking hopper, a first conveying channel, and a second conveying channel. Below the discharge port of the blanking hopper, there are provided the first conveying channel and the second conveying channel. On the first conveying channel, there are sequentially arranged: 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 first pneumatic rejection modules and second pneumatic rejection modules respectively electrically connected to the thickness detection module and the magnetic pole detection module. Among them: 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; A vibration device is arranged on the conveying path of the second conveying channel. The vibration device is used to receive the magnetic sheets on the second conveying channel and supply them again to the lower side of the discharge port of the blanking hopper; An anti-vibration structure arranged between the first conveying channel and the second conveying channel or independent support structures respectively arranged on the first conveying channel and the second conveying channel, which is used to physically isolate the recovery route of the second conveying channel from the detection route of the first conveying channel to avoid vibration interference during the magnetic pole identification process.

[0009] Further setting: including an anti-vibration structure, the anti-vibration structure includes an anti-vibration cavity and an elastic buffer layer arranged between the anti-vibration cavity and the vibration device; The resonance frequency of the anti-vibration cavity is misaligned with the excitation frequency of the vibration device, and is used to form a notch point within the target frequency range to block the resonance coupling path and suppress the propagation of vibration energy to the detection path.

[0010] Further setting: the anti-vibration cavity includes two or more resonant cavity units with different structural parameters, and multiple resonant cavity units have different resonance frequencies respectively, which are used to form acoustic notches at multiple frequency points, thereby simultaneously suppressing the vibration transmission of the main frequency band of the excitation frequency and its harmonic frequency bands.

[0011] Further setting: the difference between the resonance frequency of the anti-vibration cavity and the excitation frequency of the vibration device ≥ 30% of the excitation frequency.

[0012] Further setting: at least one reflection partition is arranged inside the anti-vibration cavity, and the reflection partition is arranged in the sound wave propagation path and is used to guide the sound wave to reflect multiple times and extend the propagation path.

[0013] Further setting: the reflection partition is arranged in a stepped, serrated or folded line shape.

[0014] Further setting: an acoustic absorption material layer is also arranged inside the anti-vibration cavity, and the acoustic absorption material layer is in a honeycomb, porous foam or fiber felt structure and covers the inner wall of the anti-vibration cavity and the surface of the reflection partition.

[0015] Further setting: The vibration isolation structure is an independent modular structure and is detachably installed between the first conveying channel and the second conveying channel.

[0016] Further setting: Along the conveying path, the first conveying channel is provided with guiding side plates and wedge-shaped guiding blocks located on the conveying path. There is a gap for a single magnetic chip to pass through between the wedge-shaped guiding blocks and the guiding side plates.

[0017] Further setting: The wedge-shaped guiding block has a guiding surface inclined upstream, and the highest point of the guiding surface is at least higher than the height of the guiding side plate.

[0018] In summary, the present invention has the following beneficial effects: First, in the present invention, by arranging a vibration isolation structure or respectively arranging an independent support structure between the first conveying channel and the second conveying channel, the recovery path where the vibration device is located is physically isolated from the detection path where the detection module is located, blocking the propagation path of the excitation energy from the structural level, significantly reducing the interference of the vibrating disc operation on precision detection processes such as magnetic pole identification and thickness identification, effectively suppressing resonance interference, and improving detection stability. Moreover, the second conveying channel is connected to the vibration device, and the vibration device can re-feed the magnetic chips in the recovery path below the discharge port. The magnetic chips with incorrect postures or those not detected can automatically flow back, realizing the automatic reflux cycle of the magnetic chips without manual intervention and re-feeding, and improving the feeding efficiency.

[0019] Second, in the present invention, the vibration isolation structure enables the first conveying channel and the second conveying channel to be connected but not transmit vibration, and uses the "non-coincidence" between the natural frequency of the vibration isolation structure and the excitation frequency to avoid energy resonance transmission; specifically, through the vibration isolation cavity designed based on the Helmholtz resonance principle, notch points are 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 "spectrum blocking band", and significantly suppressing the specific frequencies that are not desired to propagate in the resonance conduction path.

[0020] Due to the periodic excitation during the operation of the vibration device, and the recognition accuracy of the magnetic pole direction and thickness in the detection path depends on the tiny electrical signal fluctuations. Without isolation, misrecognition or rejection errors are likely to occur. This vibration isolation structure can greatly reduce the possibility of the excitation signal entering the detection path, reducing the risk of misrecognition from the source and improving the accuracy and stability of detection.

[0021] Third, in the present invention, in the magnetic sheet feeding system, in addition to the main excitation frequency, the vibration source usually generates high-order harmonic components such as 2f and 3f, which pose 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 introducing multiple resonant cavity units, a strong notch effect is formed in each cavity within its corresponding frequency range. The multiple cavities cooperate with each other to form energy absorption regions at different frequency points respectively, constructing a wide-band attenuation band, and effectively shielding the main excitation frequency and its high-order harmonics.

[0022] Fourth, in the present invention, at least one reflection partition is arranged inside the vibration isolation cavity. The reflection partition is located in the sound wave propagation path and is used to guide the sound wave to reflect multiple times in the cavity. The reflection partition forms a folding and multi-path propagation structure, equivalently enhancing the "effective length" of the cavity, which is equivalent to expanding the phase delay interval of the sound wave, and enhancing the coupling and interference elimination ability for low-frequency vibration without significantly increasing the cavity volume, and improving the low-frequency notch depth. The sound waves superimposed after multiple reflections form phase interference and standing wave patterns in the cavity. Through structural optimization, the cancellation region can be enhanced at the target frequency, forming a steeper notch attenuation curve, and effectively suppressing the coupling and propagation of vibration energy at specific frequency points.

[0023] Fifth, in the present invention, an acoustic absorption material layer is arranged in the vibration isolation cavity. The acoustic absorption material layer adopts a honeycomb, porous foam or fiber felt structure. A large number of open micro-cavities are formed through its porous microstructure. During the propagation of the sound wave, multiple viscous frictions and heat dissipations occur, which can significantly absorb the sound energy in the medium and high frequency bands, especially effectively attenuating the high-order harmonic components of the excitation frequency of the vibration device, and improving the full-frequency vibration isolation performance of the system. The acoustic absorption material and the vibration isolation cavity act together to achieve a slow and continuous frequency roll-off characteristic outside the target frequency band, so that the system is no longer only sensitive to a single frequency point, but has an overall suppression ability for a frequency bandwidth, solving the problem of actual vibration frequency drift or change.

[0024] The acoustic absorption material layer covers the reflection partition and the inner wall of the cavity, which helps to suppress the continuous reflection and standing wave enhancement of the sound wave in the cavity, reduces the unexpected resonance peak caused by uneven cavity size or multi-cavity coupling, and improves the stability and consistency of the acoustic notch.

[0025] Sixth, in the present 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 the magnetic sheet in the correct direction to pass through, which can effectively prevent the magnetic sheet from overlapping, tilting or misaligning and entering the detection channel. The guide surface is set as an upstream inclined structure, which can lift the 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 recovery under the reaction force in the conveying direction, realizing passive physical sharding and attitude correction, and reducing the system burden caused by manual preprocessing or complex mechanisms. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a magnetic sheet feeding device; Figure 2 It is a schematic diagram of the magnetic sheet conveying path of the magnetic sheet feeding device; Figure 3 It is a schematic side view of the magnetic sheet feeding device with a vibration isolation structure; Figure 4 It is a schematic structural diagram of the vibration isolation structure; Figure 5 It is a schematic side view of the magnetic sheet feeding device with an independent support structure.

[0027] In the figure, 100 is the blanking funnel; 101 is the discharge port; 200 is the first conveying channel; 300 is the second conveying channel; 301 is the vibration device; 401 is the magnetic pole detection module; 402 is the thickness detection module; 403 is the first pneumatic rejection module; 404 is the second pneumatic rejection module; 500 is the wedge-shaped guide block; 501 is the guide surface; 600 is the guide side plate; 700 is the vibration isolation structure; 701 is the vibration isolation cavity; 702 is the elastic buffer layer; 703 is the reflection partition; 704 is the sound absorption material layer; 800 is the independent support structure. Specific embodiments

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] A magnetic sheet feeding device, as Figure 1 and Figure 2 shown, includes a blanking funnel 100, a first conveying channel 200 and a second conveying channel 300. Among them, the discharge port 101 of the blanking funnel 100 is located above the device, and a first conveying channel 200 and a second conveying channel 300 are provided below its discharge port 101. The first conveying channel 200 and the second conveying channel 300 are arranged in the same direction and are respectively used for the detection and recovery of magnetic sheets.

[0031] The first conveying channel 200 is successively provided with a thickness detection module 402 and a magnetic pole detection module 401 along the conveying direction of the magnetic sheet. The thickness detection module 402 is used to detect the thickness parameter 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 arranged. The first pneumatic rejection module 403 is electrically connected to the thickness detection module 402 and is used to reject the magnetic sheets with abnormal thickness from the conveying path. The second pneumatic rejection module 404 is also electrically connected to the magnetic pole detection module 401 and is used to reject the magnetic sheets with abnormal magnetic pole directions, ensuring that the magnetic sheets entering the subsequent processes are of qualified quality.

[0032] The second conveying channel 300 is arranged on one side of the first conveying channel 200, and a vibration device 301 is arranged on its conveying path. The vibration device 301 is used to receive the magnetic sheets that are rejected from the first conveying channel 200 or fail to enter the first conveying channel 200 correctly, and re-import this part of the magnetic sheets to the lower part of the discharge port 101 of the blanking funnel 100 in the form of vibration, so that they re-enter the feeding cycle, realizing the automatic recycling and re-detection of the magnetic sheets.

[0033] There is no restriction on the specific structural form of the first conveying channel 200 and the second conveying channel 300. In this embodiment, a conveyor belt structure is preferably adopted to realize the stable movement and continuous transmission of the magnetic sheets during the conveying process. In addition, the conveying channel can also adopt forms such as a linear module conveying structure, a slide rail sliding structure, a chain conveying structure, etc., to adapt to the feeding rhythm and structural layout requirements in different scenarios.

[0034] 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 arranged between the first conveying channel 200 and the second conveying channel 300, which is used to physically isolate the detection route and the recycling route and avoid vibration interference with the magnetic pole identification process.

[0035] There is no restriction on the specific structural form of the vibration device 301. In this embodiment, an electromagnetic vibrator structure is preferably adopted. This structure drives the bearing platform to generate high-frequency micro-amplitude vibration by controlling the electromagnetic coil to generate a periodic magnetic field, and is used to re-arrange the recycled magnetic sheets and import them to the lower side of the blanking 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 optimally configured according to the required vibration frequency, amplitude and structural space to meet the requirements of different recycling rhythms and feeding efficiencies, and realize the effective sorting and re-feeding of the magnetic sheets.

[0036] Based on the above embodiments, as a further limited technical solution, as Figure 3 and Figure 4 shown, the vibration isolation structure 700 in the magnetic sheet feeding device specifically includes a vibration isolation cavity 701 provided 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 the vibration energy and at the same time forming a flexible support for the vibration cavity.

[0037] There is no limitation on the specific structural form of the elastic buffer layer 702. In this embodiment, a rubber damping pad structure is preferably adopted. This structure has good compression deformation ability and energy absorption performance, and can effectively isolate the vibration path. In addition, the elastic buffer layer 702 can also adopt other types of structures such as a spring damping component, a corrugated pipe support structure, a foam plastic cushion layer, a silica gel buffer block or an airbag-type elastic support device. Its material and form 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.

[0038] The vibration isolation cavity 701 is usually arranged below the first conveying channel 200 or at an intermediate position between the two channels and is connected to the elastic buffer layer 702. The resonance frequency of the vibration isolation cavity 701 is misaligned with the excitation frequency of the vibration device 301, so as to form an acoustic notch point within a preset target frequency range, effectively blocking the resonance coupling path of the excitation frequency and its nearby frequency bands in the structure. Through this structural arrangement, the vibration energy generated by the vibration device 301 can be significantly inhibited from propagating upward to the detection path of the first conveying channel 200, thereby improving the operation stability and recognition accuracy of the thickness detection module 402 and the magnetic pole detection module 401 under high-precision conditions.

[0039] The structural parameters of the vibration isolation cavity 701 are optimized so that there is an obvious frequency misalignment relationship between its own resonance frequency and the excitation frequency of the vibration device 301. Specifically, the difference between the resonance frequency of the vibration isolation cavity 701 and the excitation frequency of the vibration device 301 is not less than 30% of the excitation frequency. This frequency deviation setting helps to effectively avoid the resonance interval corresponding to the excitation frequency in the structural system, thereby forming a stable non-resonance band on the propagation path, further suppressing the structural coupling propagation of the vibration energy from the vibration device 301 to the detection path, and improving the anti-interference ability and detection stability of the overall feeding device.

[0040] Based on the above embodiments, as a further limited embodiment, as Figure 4As shown, two or more resonant cavity units are arranged inside the vibration isolation cavity 701, and each resonant cavity unit is arranged in sequence along the direction of the sound wave propagation path of the vibration isolation cavity 701, and each has different structural parameters, thereby giving it a different resonant frequency. Through this multi-unit staggered frequency combination structure, an acoustic trap can be formed at multiple required frequency points, effectively weakening the sound wave energy transfer at the corresponding frequency. In this way, not only can the vibration of the main frequency band corresponding to the excitation frequency of the vibration device 301 be significantly suppressed, but also the energy propagation of its high-order harmonic frequency band can be synchronously attenuated, further improving the suppression range and effect of vibration interference on the detection path.

[0041] On the basis of the above implementation manner, as a further limited implementation manner, Figure 4 As shown, at least one reflective baffle 703 is provided inside the vibration isolation cavity 701. The reflective baffle 703 is arranged on the sound wave propagation path to change the propagation direction of the sound wave, so that the sound wave is reflected multiple times in the vibration isolation cavity 701, thereby significantly extending its propagation path, increasing the dissipation process of sound energy, and improving the ability to weaken vibration energy. The reflective baffle 703 can be arranged in a stepped, serrated or broken line manner according to the cavity structure, further enhancing the complexity and irregularity of the sound wave reflection path, helping to improve the interference attenuation efficiency of the sound wave, and synergistically improving the overall vibration isolation performance when used with the sound absorbing material layer 704.

[0042] On the basis of the above implementation manner, as a further limited implementation manner, Figure 4 As shown, a sound absorbing material layer 704 is provided inside the vibration isolation cavity 701, and the sound absorbing material layer 704 is in a honeycomb, porous foam or fiber felt structure. The 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 absorption area for sound waves, thereby further improving the vibration isolation effect of the vibration isolation cavity 701. The sound absorbing material layer 704 fits tightly with the inner wall of the vibration isolation cavity 701 and the reflective baffle 703 to ensure the stability of the structure and the durability of the acoustic performance. Through the above arrangement, the sound absorbing material layer 704 can effectively block and attenuate the noise transmitted into the vibration isolation cavity 701, and improve the detection accuracy and stability of the entire device.

[0043] There is no limitation on the specific structure of the sound absorbing material layer 704. In this embodiment, a honeycomb sound absorbing structure is preferably used, which has a dual sound energy attenuation mechanism of multi-faceted reflection and pore absorption. In addition, a porous foam structure, such as polyurethane foam, phenolic foam, or a fiber felt structure, such as glass fiber felt, polyester fiber felt, etc., 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 use environment to achieve an ideal vibration isolation and noise reduction effect.

[0044] On the basis of the above embodiments, as a further defined embodiment, as Figure 4 shown, the vibration isolation structure 700 is an independent modular structure, which is detachably installed between the first conveying channel 200 and the second conveying channel 300. With 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 according to the characteristics of the vibration source, thus meeting the suppression requirements for the spectral energy distribution characteristics in different application scenarios, and having good scalability and engineering adaptability.

[0045] On the basis of the above embodiments, as a further defined embodiment, as Figure 1 and Figure 2 shown, the first conveying channel 200 is sequentially provided with guiding side plates 600 and wedge-shaped guiding blocks 500 arranged on the transmission path along the direction of its conveying path. The wedge-shaped guiding blocks 500 are arranged between the guiding side plates 600, and an interval channel for a single magnetic sheet to pass through is formed therebetween, so as to realize the limiting and guiding of the movement direction of the magnetic sheet. The wedge-shaped guiding block 500 is provided with a guiding surface 501 inclined upward in the upstream direction, and the highest point of the guiding surface 501 is above the height of the guiding side plates 600. The design with a height superior to that of the guiding side plates 600 is conducive to effectively guiding and limiting the magnetic sheets coming from the upstream, preventing multiple sheets from overlapping or shifting into the detection path.

[0046] During the working process of the present invention, the magnetic sheets are first put into the feeding hopper 100. The discharge port 101 of the feeding hopper 100 is opened, and under the action of gravity, the magnetic sheets fall from the discharge port 101 of the feeding hopper 100 into the first conveying channel 200 below it. The wedge-shaped guiding blocks 500 are arranged on the path of the first conveying channel 200, and the gap between the wedge-shaped guiding blocks 500 and the guiding side plates 600 is precisely set according to the size of the magnetic sheets, allowing only the magnetic sheets with the correct direction in one direction to pass through, effectively avoiding the magnetic sheets from overlapping, tilting or being misaligned and entering the detection channel. The guiding surface 501 is set as an inclined structure in the upstream direction, and under the reaction force in the conveying direction, the locally stacked or adhered magnetic sheets can be lifted up and forced to slide into the second conveying channel 300 for recovery.

[0047] Immediately afterwards, 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, and respectively performs on-line detection on the thickness and magnetic pole direction of the magnetic sheets. When the detection result is abnormal, the magnetic sheets with abnormal thickness are removed by the first pneumatic rejection module 403 arranged downstream of the thickness detection module 402, and the magnetic sheets with abnormal magnetic pole direction are removed by the second pneumatic rejection module 404 arranged downstream of the magnetic pole detection module 401, ensuring that the magnetic sheets entering the subsequent processes meet the process requirements.

[0048] For the rejected abnormal magnetic disks, they are blown into the second conveying channel 300 by the pneumatic rejection module, and the vibration device 301 rearranges the recycled magnetic disks and makes them fall back to the lower area of the blanking funnel 100 again, so as to detect and arrange them again.

[0049] Reference Figure 5 , as an alternative implementation, cancel the vibration isolation structure 700, and respectively set independent support structures 800 below the first conveying channel 200 and the second conveying channel 300, which are used to physically isolate the detection route and the recycling route to avoid vibration interference with the magnetic pole identification process.

[0050] The above embodiments are only explanations of the present invention, and they are not limitations of the present invention. Those skilled in the art can make modifications to the present embodiments without creative contributions according to needs after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A magnetic sheet feeding device, characterized in that, Comprising: A blanking funnel (100), a first conveying channel (200) and a second conveying channel (300). Below the discharge port (101) of the blanking funnel (100), there are provided the first conveying channel (200) and the second conveying channel (300). On the first conveying channel (200), there are successively arranged: 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 first pneumatic rejection modules (403) and second pneumatic rejection modules (404) respectively electrically connected to the thickness detection module (402) and the magnetic pole detection module (401). Among them: 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 arranged on the conveying path of the second conveying channel (300). The vibration device (301) is used to receive the magnetic sheets on the second conveying channel (300) and supply them again to the lower side of the discharge port (101) of the blanking funnel (100); An anti-vibration structure (700) arranged between the first conveying channel (200) and the second conveying channel (300) or independent support structures (800) respectively arranged on the first conveying channel (200) and the second conveying channel (300), which 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 in the magnetic pole identification process.

2. The magnetic sheet feeding device according to claim 1, characterized in that: Comprising an anti-vibration structure (700), the anti-vibration structure (700) includes an anti-vibration cavity (701) and an elastic buffer layer (702) arranged between the anti-vibration cavity (701) and the vibration device (301); The resonance frequency of the anti-vibration cavity (701) is misaligned with the excitation frequency of the vibration device (301), which is used to form a notch point within the target frequency range, block the resonance 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 anti-vibration cavity (701) includes two or more resonant cavity units with different structural parameters. The multiple resonant cavity units have different resonance frequencies respectively, which are used to form acoustic notches at multiple frequency points, so as to simultaneously suppress the vibration transmission of the main frequency band of the excitation frequency and its harmonic frequency bands.

4. The magnetic sheet feeding device according to claim 2, wherein: The difference between the resonance frequency of the anti-vibration cavity (701) and the excitation frequency of the vibration device (301) ≥ 30% of the excitation frequency.

5. The magnetic sheet feeding device according to any one of claims 2-4, characterized in that: At least one reflection partition (703) is arranged inside the anti-vibration cavity (701). The reflection partition (703) is arranged in the sound wave propagation path, which is used to guide the sound wave to reflect multiple times and extend the propagation path.

6. The magnetic sheet feeding device according to claim 5, wherein: The reflection partition (703) is arranged in a stepped, serrated or polyline shape.

7. The magnetic sheet feeding device according to claim 5, characterized in that: An acoustic absorption material layer (704) is also arranged inside the anti-vibration cavity (701). The acoustic absorption material layer (704) is in a honeycomb, porous foam or fiber felt structure, covering the inner wall of the anti-vibration cavity (701) and the surface of the reflection partition (703).

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

9. The magnetic sheet feeding device according to claim 1, wherein: The first conveying channel (200) is provided with guiding side plates (600) along the conveying path and wedge-shaped guiding blocks (500) located on the conveying path. There is a gap for a single magnetic sheet to pass through between the wedge-shaped guiding blocks (500) and the guiding side plates (600).

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

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