Magnetic powder distributing device

Abstract

The present disclosure relates to a magnetic powder distributing device, comprising a base, a distributing part with a distributing disc, the distributing disc comprising a supporting plate and guiding ribs arranged radially above the supporting plate, and a driving part for driving the distributing part to reciprocate relative to the base along a predetermined track, so that the magnetic powder falling into the supporting plate is guided by the guiding ribs and slides off from the periphery of the supporting plate. Taking a ring-shaped magnet as an example, the magnetic powder distributing device of the present disclosure can ensure that the ideal powder distribution effect is achieved in the ring-shaped mold cavity, and the magnetic properties and mechanical strength of the prepared ring-shaped magnet are guaranteed. Moreover, the periphery of the supporting plate can better correspond to the shape of the ring-shaped magnet, and the preparation of the ring-shaped magnet using the magnetic powder distributing device of the present disclosure is also more efficient.

Description

Technical Field

[0001] This disclosure relates to the field of magnetic powder pressing, and more particularly to a magnetic powder feeding device. Background Technology

[0002] In the process of manufacturing magnets, a mold with an internal cavity is used to uniformly fill the cavity with magnetic powder. The magnetic powder is then pressed and sintered to produce the magnet. Whether the magnetic powder is evenly distributed in the cavity before pressing determines the magnetic and mechanical strength of the finished magnet.

[0003] Taking ring magnets as an example, related technologies mainly employ rotary powder distribution and scraping-filling powder distribution methods to fill the ring-shaped mold cavity with magnetic powder. The rotary powder distribution method involves rotating the mold, causing the magnetic powder to distribute under centrifugal force. The scraping-filling powder distribution method uses a tool to scrape and spread the magnetic powder within the mold cavity. Both methods struggle to achieve ideal powder distribution; uneven powder distribution leads to inconsistent magnetic powder density, which in turn affects the magnetic and mechanical strength of the ring magnet, reducing its yield. Utility Model Content

[0004] The purpose of this disclosure is to provide a magnetic powder feeding device to solve the problem of uneven distribution of magnetic powder in the mold cavity during the preparation of ring magnets in related technologies.

[0005] To achieve the above objectives, this disclosure provides a magnetic powder cloth applicator, comprising: Base; The fabric section has a fabric tray, which includes a support plate and radially arranged guide ribs located above the support plate; A drive unit is used to drive the fabric part to reciprocate and vibrate relative to the base along a predetermined trajectory, so that the magnetic powder falling into the support plate is guided by the guide rib and slides off the periphery of the support plate.

[0006] In some possible implementations, the drive unit is configured to drive the fabric part to reciprocate in the height direction as well as in the circumferential direction.

[0007] In some possible implementations, the base includes a receiving groove; The fabric section includes a cover and a feeding funnel. The cover is disposed above the receiving groove, and the feeding funnel extends through the receiving groove in the height direction and is connected to the fabric tray at the bottom.

[0008] In some possible implementations, the drive unit includes a linear component and a rotary component; The linear member is disposed in the receiving groove and is used to drive the cover to move in the height direction relative to the base; The rotating component includes a spring that is obliquely connected between the receiving groove and the cover, the spring being configured to guide the cover to rotate as it moves toward the receiving groove.

[0009] In some possible implementations, the number of reeds is multiple, and they are arranged at circumferential intervals.

[0010] In some possible implementations, the linear component includes: An armature is disposed within the cover; An electromagnet assembly is disposed in the receiving groove and configured to attract and repel the armature when energized.

[0011] In some possible implementations, the number of armatures and electromagnet assemblies are the same, and their positions correspond one-to-one.

[0012] In some possible implementations, the feeding hopper is a magnetically shielded component, and / or A first magnetic shielding element is provided between the feeding hopper and the electromagnet assembly.

[0013] In some possible implementations, the linear component includes: A piezoelectric ceramic component is disposed in the receiving groove, and the piezoelectric ceramic component is connected to the cover component so as to drive the cover component to move in the height direction after being energized.

[0014] In some possible implementations, the feeding funnel includes a first conical surface for receiving magnetic powder and a second conical surface connected below the first conical surface, wherein the angle of inclination of the first conical surface is smaller than the angle of inclination of the second conical surface relative to the horizontal direction, and the bottom end of the second conical surface is connected to the fabric tray.

[0015] In some possible implementations, the support plate has a protrusion and a recess surrounding the protrusion, the protrusion being located below the discharge port of the feeding funnel.

[0016] In some possible implementations, the guide rib is a plate-like structure standing above the support plate.

[0017] In some possible implementations, the guide rib is tilted above the support plate, and the guide rib has a curved surface.

[0018] In some possible implementations, the plurality of the guide ribs are arranged in a rotationally symmetrical manner on the support plate.

[0019] In some possible implementations, a discharge funnel is also included, which is arranged around the outside of the material distribution plate to guide the magnetic powder into the mold cavity.

[0020] In some possible implementations, a frustum is also included, located below the fabric tray and spaced apart inside the discharge funnel, the annular gap formed by the discharge funnel and the frustum being used to guide the magnetic powder discharge.

[0021] In some possible implementations, a feed hopper is also included, configured to feed magnetic powder into the fabric section at a predetermined rate.

[0022] Through the above technical solution, the magnetic powder feeding device disclosed herein can drive the magnetic powder to vibrate through the feeding section and the driving section, so that the magnetic powder can fall more evenly from the periphery of the support plate into the annular mold cavity. This avoids uneven distribution of magnetic powder particles and uneven magnetic powder density in the annular mold cavity caused by tool extrusion, ensuring an ideal powder feeding effect in the annular mold cavity and guaranteeing the magnetic and mechanical strength of the prepared annular magnet. Furthermore, the periphery of the support plate can better correspond to the shape of the annular magnet, and the preparation of annular magnets using the magnetic powder feeding device disclosed herein is also more efficient.

[0023] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the mold disclosed in this embodiment; Figure 2 This is a structural diagram of the magnetic powder cloth device disclosed in the embodiments of this disclosure; Figure 3 This is a cross-sectional view of the magnetic powder feeding device disclosed in this embodiment, wherein the linear component is an armature and an electromagnet assembly; Figure 4 This is a cross-sectional view of the magnetic powder cloth device disclosed in this embodiment, wherein the linear component is a piezoelectric ceramic component; Figure 5 This is a schematic diagram of the structure within the base disclosed in this embodiment; Figure 6 This is a schematic diagram of the structure of the fabric section disclosed in the embodiments of this disclosure; Figure 7 This is a cross-sectional view of the fabric portion disclosed in this embodiment; Figure 8 yes Figure 7 Enlarged view of section A.

[0025] Explanation of reference numerals in the attached figures 100-Base, 110-Receiving groove, 120-Bracket, 200-Fabricating part, 210-Fabricating tray, 211-Support plate, 2111-Protrusion, 2112-Recess, 212-Guide rib, 220-Covering part, 230-Feeding funnel, 231-First conical surface, 232-Second conical surface, 300-Drive part, 310-Linear component, 311-Armature, 312-Electromagnetic assembly, 3121-Iron core, 3122-Coil, 313-Piezoelectric ceramic component, 320-Rotating component, 321-Reed, 400-Discharge funnel, 500-Frustum, 900-Mold, 901-Mold cavity. Detailed Implementation

[0026] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0027] In this disclosure, the terms “upper,” “lower,” “left,” “right,” “front,” “rear,” “inner,” and “outer,” etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this disclosure and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0028] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain circumstances to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this disclosure according to the specific circumstances.

[0029] Furthermore, the terms "installation," "setup," "equipped with," "connected," "linked," "connected," or similar terms should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral construction; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection via an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0030] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0031] In the process of manufacturing a magnet, a mold 900 with an internal cavity 901 is used. Magnetic powder is uniformly filled into the mold cavity 901, and then the magnetic powder is pressed and sintered to prepare the magnet. Whether the magnetic powder is uniformly distributed within the mold cavity 901 before pressing determines the magnetic and mechanical strength of the finished magnet. The shape of the mold 900 can be referenced... Figure 1 A simple illustration.

[0032] If the magnetic powder is not evenly distributed within the mold cavity 901, the pressure cannot be evenly transmitted to all locations within the cavity during pressing. This results in uneven and non-uniform density of the magnetic powder within the cavity. Consequently, after fabrication, the magnet will exhibit inconsistent magnetism at different locations due to this uneven powder density. Furthermore, the uneven powder density within the cavity 901 makes the magnet prone to bending, warping, and even cracking, affecting its mechanical strength.

[0033] Taking a ring magnet as an example, related technologies mainly employ rotating powder distribution and scraping-filling powder distribution methods to fill the annular cavity 901 with magnetic powder. In the rotating powder distribution method, the magnetic powder is linearly transported and falls into the cavity 901 at a fixed position. The rotation of the cavity 901 causes the magnetic powder to fill the entire cavity. However, the magnetic powder is not composed of particles of completely uniform size. The uneven distribution of magnetic powder particles of different sizes within the rotating cavity 901 makes it difficult to achieve an ideal powder distribution effect.

[0034] The scraping-filling powder application method involves using a tool to scrape and lay magnetic powder within the mold cavity 901. As mentioned above, the magnetic powder is not composed of particles of completely uniform size. When the magnetic powder is scraped, a region of accumulated magnetic powder forms in front of the tool. This region is compressed, resulting in a higher density of magnetic powder. Conversely, the magnetic powder left behind after the tool moves has a relatively lower density. In other words, density fluctuations are created when the tool scrapes the magnetic powder, making it difficult to achieve an ideal powder application effect within the mold cavity. Furthermore, the scraping-filling powder application method generally requires multiple layers of magnetic powder application, and different layers of magnetic powder will also exhibit density differences, making it difficult to achieve an ideal powder application effect within the mold cavity.

[0035] To address the aforementioned problems, the solution disclosed herein will be described in detail below with reference to the accompanying drawings.

[0036] This disclosure uses a ring magnet as an example for description, but other types of magnets can also be referred to and applied.

[0037] Specific reference Figures 2 to 8 This disclosure provides a magnetic powder cloth making device, including a base 100, a cloth making part 200 and a drive part 300.

[0038] The base 100 is used to mount the fabric part 200 and the drive part 300.

[0039] In some embodiments, the base 100 can be fixed to a movable support of the press. As described above, after the magnetic powder is uniformly filled into the annular mold cavity 901, it needs to be pressed. The press here can be understood as a device for pressing magnetic powder, or a forming device. In this way, after the magnetic powder is uniformly filled into the annular mold cavity 901, the press can directly press and form the magnetic powder, making the preparation of the annular magnet easier. In other embodiments, due to space limitations, it may be difficult to directly connect and fix the base 100 to the press. In this case, refer to... Figure 2 The base 100 can be fixed on the bracket 120, and the stability of the base 100 is ensured by the bracket 120. In this disclosure, the base 100 can be fixed on the bracket 120 by any appropriate connection form or connection structure. This disclosure does not make specific limitations, as long as the stability of the base 100 can be ensured.

[0040] Reference Figures 2 to 4 The fabric section 200 has a fabric tray 210, which includes a support plate 211 and radially arranged guide ribs 212 located above the support plate 211. When magnetic powder needs to be filled into the annular mold cavity 901 using the magnetic powder fabrication device of this disclosure, the magnetic powder that needs to enter the annular mold cavity 901 can first fall into the fabric tray 210 of the fabric section 200. The magnetic powder falling onto the fabric tray 210 can be initially supported by the support plate 211. When the magnetic powder needs to move on the support plate 211, the guide ribs 212 can guide the movement direction of the magnetic powder, ensuring that the magnetic powder can move along a specific direction. In this disclosure, the guide ribs 212 can be understood as radially arranged plate-like structures above the support plate 211, used to guide the magnetic powder to move towards the edge of the support plate 211.

[0041] The drive unit 300 drives the fabric section 200 to reciprocate relative to the base 100 along a predetermined trajectory, causing the magnetic powder falling into the support plate 211 to be guided by the guide ribs 212 and slide off the periphery of the support plate 211. In this way, the fabric section 200 can be movably connected to the base 100 via the drive unit 300. When the drive unit 300 drives the fabric section 200 to reciprocate relative to the base 100, the support plate 211 and the guide ribs 212 in the fabric section 200 also vibrate simultaneously. During vibration, the support plate 211 lifts the magnetic powder it carries, and the guide ribs 212 impact the magnetic powder lifted by the support plate 211, causing the magnetic powder to move along a specific direction.

[0042] Taking a circular support plate 211 as an example, the periphery of the support plate 211 can be an annular trajectory corresponding to the opening trajectory of the annular mold cavity 901, and the radially arranged guide ribs 212 can extend radially in the support plate 211. When magnetic powder falls onto the support plate 211, with the vibration of the fabric part 200, the guide ribs 212 constrain the movement path of the magnetic powder along the radial direction of the support plate 211. The magnetic powder is orderly conveyed along the radial direction of the support plate 211 towards the periphery of the support plate 211 until it falls from the periphery of the support plate 211 into the annular mold cavity 901. At the same time, since the guide ribs 212 are radially and uniformly distributed, it ensures that the amount of magnetic powder sliding off the support plate 211 in each direction is basically equal, so as to ensure that the magnetic powder fabrication device can provide uniform magnetic powder to the annular mold cavity 901. During vibration, particles of different sizes in the magnetic powder are thoroughly mixed, resulting in a more uniform density of the magnetic powder falling into the annular mold cavity 901. Furthermore, vibration increases the flowability of the magnetic powder as it falls into the annular mold cavity 901, ensuring uniform distribution and preventing powder accumulation, thus achieving an ideal powder distribution effect. This powder distribution effect can also be understood as the material distribution effect, referring to the uniformity and density of the magnetic powder filling the annular mold cavity 901. A better powder distribution effect results in a more uniform and denser distribution of magnetic powder within the annular mold cavity 901.

[0043] Through the above technical solution, in the magnetic powder feeding device of this disclosure, the feeding section 200 and the driving section 300 can drive the magnetic powder to vibrate, so that the magnetic powder can fall more evenly from the periphery of the support plate 211 into the annular mold cavity 901. This avoids uneven distribution of magnetic powder particles and uneven magnetic powder density in the annular mold cavity caused by tool extrusion, ensuring an ideal powder feeding effect in the annular mold cavity 901 and guaranteeing the magnetic and mechanical strength of the prepared annular magnet. Furthermore, the periphery of the support plate 211 can better correspond to the shape of the annular magnet, and the preparation of annular magnets using the magnetic powder feeding device of this disclosure is also more efficient.

[0044] Compared to the rotary powder distribution method and scraping powder distribution method mainly used in related technologies, the magnetic powder distribution device disclosed herein can avoid the influence of magnetic powder particles of different sizes, and can also complete the entire distribution process without interruption or multiple operations. This avoids the occurrence of magnetic powder stratification caused by interruption or multiple operations, and ensures that the annular mold cavity 901 achieves the ideal powder distribution effect.

[0045] In some embodiments, the drive unit 300 can be configured to drive the fabric part 200 to reciprocate in both the height and circumferential directions (i.e., torsional vibration). It is understood that "circumferential" here refers to the circumferential direction of the annular cavity 901 in the mold 900, or it can refer to the circumferential direction of the support plate 211. In this disclosure, unless otherwise specified, the circumferential direction mentioned below can refer to either the circumferential direction of the annular cavity 901 in the mold 900 or the circumferential direction of the support plate 211. That is, the fabric part 200 can reciprocate in both the height and circumferential directions simultaneously under the drive of the drive unit 300. In this case, the movement of the fabric part 200 during one vibration can be understood as a composite motion process of torsion and linear motion, similar to a nut rotating on a bolt, where the bolt moves not only along its axial direction but also along its circumferential direction. The reciprocating vibration in the height direction ensures that the magnetic powder carried on the support plate 211 is vibrated during vibration. The circumferential reciprocating vibration ensures that the guide rib 212 impacts the magnetic powder vibrating by the support plate 211 during vibration. When the guide rib 212 impacts the magnetic powder, it not only gives the magnetic powder a component force moving along the circumferential direction, but also a component force moving outward along the radial direction of the support plate 211, that is, the radial outward component force of the annular mold cavity 901. This causes the magnetic powder to continuously move towards the periphery of the support plate 211 during vibration until it falls off the support plate 211, forming a directional transport of the magnetic powder on the support plate 211.

[0046] In some embodiments, refer to Figure 3 and Figure 4 The base 100 may include a receiving groove 110. The fabric part 200 may include a cover 220 and a feeding funnel 230. The cover 220 may be disposed above the receiving groove 110, and the feeding funnel 230 may penetrate the receiving groove 110 in the height direction and be connected to the fabric tray 210 at the bottom.

[0047] The feeding funnel 230 first gathers the magnetic powder, and the gathered magnetic powder falls onto the distribution plate 210 through the funnel opening at the bottom of the feeding funnel 230. It can be understood that the funnel opening at the bottom of the feeding funnel 230 can correspond to the center of the support plate 211 in the distribution plate 210. As mentioned above, the periphery of the support plate 211 can better correspond to the shape of the annular magnet. In this case, the support plate 211 is a circular plate, and correspondingly, the center of the support plate 211 is its center point. When the funnel opening at the bottom of the feeding funnel 230 corresponds to the center of the support plate 211 in the distribution plate 210, the magnetic powder gathered from the feeding funnel 230 can fall directly onto the center of the support plate 211, ensuring that the amount of magnetic powder between two adjacent guide ribs 212 is uniform, further ensuring that the amount of magnetic powder sliding down from the support plate 211 in each direction is basically equal.

[0048] Meanwhile, the base 100 can limit the position of the feeding funnel 230 in the fabric section 200. When the fabric section 200 does not need vibration, the base 100 can fix the position of the feeding funnel 230. When the fabric section 200 needs vibration, the base 100 will not affect the reciprocating vibration of the feeding funnel 230 in the vertical direction or in the circumferential direction. In other words, this design satisfies both the need to fix the fabric section 200 and the need for vibration of the fabric section 200. The mounting groove on the base 100 not only reduces the weight of the base 100, but also provides space for the installation of other components.

[0049] In some embodiments, a through hole may be formed at the middle position of the bottom of the receiving groove 110, through which the feeding funnel 230 can pass, so that the feeding funnel 230 penetrates the receiving groove 110 in the height direction. It is understood that the wall of the through hole can be inclined to fit the outer wall of the feeding funnel 230.

[0050] Reference Figure 3 and Figure 4 The feeding hopper 230 may include a first conical surface 231 and a second conical surface 232. In the height direction, the first conical surface 231 may be located above the second conical surface 232. In this case, the feed inlet of the feeding hopper 230 is formed on the first conical surface 231, and the discharge outlet is formed on the second conical surface 232. The opening of the first conical surface 231 can be relatively large, with a small angle of inclination relative to the horizontal direction. This ensures that the feeding hopper 230 can receive sufficient magnetic powder and prevents the magnetic powder from overflowing outside the feeding hopper 230. The second conical surface 232 has a larger angle of inclination relative to the horizontal direction. This prevents the second conical surface 232 from occupying too much space within the receiving groove 110 and also allows for a smaller discharge outlet, facilitating the arrangement of magnetic powder during material distribution.

[0051] In some embodiments, the drive unit 300 may include a linear member 310 and a rotating member 320. The linear member 310 may be disposed within the receiving groove 110 for driving the cover member 220 to move relative to the base 100 in the height direction. The rotating member 320 may include a spring 321 obliquely connected between the receiving groove 110 and the cover member 220, the spring 321 being configured to guide the cover member 220 to rotate as it moves toward the receiving groove 110. In this way, the drive unit 300 can indirectly drive the feeding funnel 230 and the feeding disc 210 to vibrate in the height direction by driving the cover member 220. When the cover member 220 vibrates, the cover member 220 may first move upward in the height direction, disengaging from the base 100. Further, the cover member 220 may then move downward in the height direction from a position away from the base 100, re-attaching to the base 100, thus achieving one vibration in the height direction. Compared to the drive unit 300 being directly connected to the feeding disc 210, this indirect drive method avoids the feeding disc 210 having any connection points other than the feeding funnel 230, thus preventing other connection points from obstructing the movement of magnetic powder.

[0052] When the cover 220 vibrates in the height direction, the cover 220 will pull the spring 321, as shown in the figure. Figure 2 Because the reed 321 is inclined in the height direction, it will rotate when subjected to a linear driving force. The rotating reed 321 then pulls on the cover 220, causing it to rotate circumferentially. In other words, the reed 321 effectively limits or guides the cover 220 during its movement in the height direction, causing it to reciprocate in the circumferential direction, thus achieving reciprocating vibration. In other words, the drive unit 300, with only the linear member 310 as a power source, ensures that the cover 220 can reciprocate in both the height and circumferential directions.

[0053] In some embodiments, there can be multiple reeds 321 arranged at circumferential intervals. It should be understood that multiple reeds 321, when subjected to a linear driving force in the height direction, have the same torsional tendency. This ensures that the covering member 220 is subjected to uniform force when rotating circumferentially, making the rotation of the covering member 220 more stable and reliable, and preventing phenomena such as tilting and swaying of the covering member 220 during rotation. At the same time, the multiple reeds 321 arranged at circumferential intervals work together to form a rotation axis for the covering member 220 during rotation, preventing the covering member 220 from moving or rotating in other directions, further making the rotation of the covering member 220 more stable and reliable.

[0054] The linear member 310 may include an armature 311 and an electromagnet assembly 312. The armature 311 is disposed within the cover 220; the electromagnet assembly 312 is disposed in the receiving groove 110 and configured to attract and repel the armature 311 upon energization. (See reference...) Figure 3 The armature 311 can be embedded within the cover 220. It is understood that the armature 311 needs to have polarity to ensure that it can be attracted or repelled by the electromagnet assembly 312. (Refer to...) Figure 5 The electromagnet assembly 312 may include an iron core 3121 and a coil 3122. The coil 3122 is sleeved around the iron core 3121. When the coil 3122 is energized, the electromagnet assembly 312 can generate polarity. By changing the direction of the current, the polarity of the electromagnet assembly 312 can be changed. When the polarity of the electromagnet assembly 312 is the same as the polarity of the armature 311, the armature 311 and the electromagnet assembly 312 can repel each other and generate a repulsive force. When the polarity of the electromagnet assembly 312 is different from the polarity of the armature 311, the armature 311 and the electromagnet assembly 312 can attract each other and generate an attractive force.

[0055] This design, utilizing the electromagnet assembly 312 and armature 311, achieves reciprocating vibrations with minimal mechanical transmission delay due to the rapid response of the electromagnet assembly 312. This allows for very high-frequency reciprocating vibrations, resulting in more efficient powder application. Furthermore, by changing the current in the coil 3122, the magnitude of the attractive or repulsive force generated by the electromagnet assembly 312 can be adjusted, thereby better regulating the vibration amplitude of the cover member 220 and the powder application tray 210. Changing the direction of the current in the coil 3122 also allows for adjustment of whether the electromagnet assembly 312 generates an attractive or repulsive force, further enhancing the vibration direction of the cover member 220 and the powder application tray 210.

[0056] In the initial state of the magnetic powder applying device disclosed herein—which can be understood as the state before the device is activated—the cover 220 can be mounted on the base 100, and the electromagnet assembly 312 is not activated. When the magnetic powder applying device is activated and the fabric section 200 needs to be driven to vibrate, the electromagnet assembly 312 can be energized, generating the same polarity as the armature 311. At this time, due to the repulsive force, the armature 311 will drive the cover 220 away from the electromagnet, and the armature 311 and the cover 220 will move upward in the height direction. Furthermore, due to the influence of the spring 321, the cover 220 will also rotate in the circumferential direction. Under the limit of the spring 321, the cover 220 will move upward for a period of time and then stop. Then, to reset the cover 220, the electromagnet assembly 312 can be activated and the current direction in the coil 3122 can be changed, so that the electromagnet assembly 312 can generate a polarity opposite to that of the armature 311. At this time, due to the attraction, the armature 311 will drive the cover 220 closer to the electromagnet assembly 312, and the armature 311 and the cover 220 will move downward in the height direction. Alternatively, to reset the cover 220, the electromagnet assembly 312 can be directly turned off. In this way, the armature 311 and the cover 220 will also move downward in the height direction due to the influence of gravity. During the downward movement of the cover 220, due to the influence of the spring 321, the cover 220 will also rotate in the circumferential direction until the cover 220 is re-set on the base 100, thus completing one vibration of the cover 220. By adjusting the coil 3122 via a frequency converter and controlling the start and stop of the electromagnet assembly 312 multiple times, the reciprocating vibration of the cover 220 can be achieved, which in turn enables the reciprocating vibration of the fabric disc 210.

[0057] In some embodiments, the number of armatures 311 and electromagnet assemblies 312 can be the same, and their positions correspond one-to-one. In this way, the repulsive and attractive forces generated between the electromagnet assemblies 312 and the armatures 311 are along the height direction, making the vibration of the cover 220 in the height direction more stable and reliable, and preventing phenomena such as tilting of the cover 220 during vibration in the height direction. Simultaneously, the combined action of multiple armatures 311 and electromagnet assemblies 312 further enhances the stability and reliability of the vibration of the cover 220 in the height direction.

[0058] In some other embodiments, the linear component 310 can also be a piezoelectric ceramic component 313, see reference. Figure 4 The piezoelectric ceramic component 313 can directly convert electrical energy into mechanical displacement and force. When the piezoelectric ceramic component 313 is placed in the receiving groove 110 and connected to the cover component 220, when a voltage is applied to the piezoelectric ceramic component 313, that is, after the piezoelectric ceramic component 313 is energized, the size of the piezoelectric ceramic component 313 will change, which can drive the cover component 220 to move in the height direction.

[0059] The cover 220 may be equipped with a push rod that contacts the piezoelectric ceramic element 313, achieving an indirect connection between the piezoelectric ceramic element 313 and the cover 220. Alternatively, there may be multiple piezoelectric ceramic elements 313, which are directly connected to the cover 220. When a periodic high-voltage signal is applied to the piezoelectric ceramic element 313, the piezoelectric ceramic element 313 will correspondingly undergo periodic elongation and shortening. Through structural transmission, this can drive the cover 220 and the fabric feeding disc 210 to perform high-frequency reciprocating motion. Because the vibration amplitude of the piezoelectric ceramic element 313 is small, the fabric feeding is smoother, making it more suitable for micro-control of magnetic powder during fabric feeding. In some embodiments, the piezoelectric ceramic element 313 can be connected to a frequency converter, which is used to apply a periodic voltage signal to the piezoelectric ceramic element 313.

[0060] Generally, to prevent the magnetism of other components (such as the electromagnet assembly 312 mentioned above) from interfering with the distribution of magnetic powder, in some possible embodiments, the feeding funnel 230 can be a magnetic shielding component. When the feeding funnel 230 is a magnetic shielding component, it can confine the magnetism of the magnetic powder within the feeding funnel 230, preventing mutual interference between the magnetic powder and the external magnetic field.

[0061] In some other possible embodiments, a first magnetic shielding element may be provided between the feeding hopper 230 and the electromagnet assembly 312. This ensures that the electromagnet assembly 312 and the magnetic powder do not interfere with each other during use. A second magnetic shielding element may also be provided around the inner side of the periphery of the receiving groove 110. The second magnetic shielding element can confine the magnetism of the electromagnet assembly 312 within the receiving groove 110 and further shield the magnetic field, preventing interference between the electromagnet assembly 312 and external magnetic fields.

[0062] In some embodiments, the first and second magnetic shielding elements can be magnetic shielding sheets attached to their respective surfaces. For example, the first magnetic shielding element can be a magnetic shielding sheet attached to the surface of the feeding hopper 230. In this disclosure, the specific forms of the first and second magnetic shielding elements are not limited, and they can be implemented in any other feasible manner. For example, the first magnetic shielding element can also be a magnetic shielding plate disposed between the feeding hopper 230 and the electromagnet assembly 312.

[0063] The magnetic shielding component, the first magnetic shielding element, and the second magnetic shielding element can all be made of magnetic shielding materials such as beryllium copper, effectively shielding the magnetic field. Similarly, this disclosure does not limit the material of the magnetic shielding component, the first magnetic shielding element, and the second magnetic shielding element; other feasible materials besides beryllium copper can also be used.

[0064] In some possible implementations, the feeding hopper 230 includes a first conical surface 231 for receiving magnetic powder and a second conical surface 232 connected below the first conical surface 231, wherein the angle of inclination of the first conical surface 231 is smaller than the angle of inclination of the second conical surface 232 relative to the horizontal direction, and the bottom end of the second conical surface 232 is connected to the feeding disc 210.

[0065] In some implementations, refer to Figures 6 to 8 The support plate 211 may have a protrusion 2111 and a recess 2112 surrounding the protrusion 2111. The protrusion 2111 is located below the discharge port of the feeding funnel 230. Here, both the protrusion 2111 and the recess 2112 are relative to the main surface of the support plate 211. The protrusion 2111 can prevent clogging of the discharge port of the feeding funnel 230. When the magnetic powder flows out of the discharge port of the feeding funnel 230, due to the arrangement of the protrusion 2111, the magnetic powder will not accumulate below the discharge port, but will be guided into the recess 2112 via the protrusion 2111. At this time, the recess 2112 can serve as a space for temporary storage of magnetic powder. When the fabric part 200 reciprocates relative to the base 100 along a predetermined trajectory, the magnetic powder located in the recess 2112 can move between two adjacent guide ribs 212 until it slides off the periphery of the support plate 211.

[0066] In some embodiments, the guide rib 212 is a plate-like structure standing above the support plate 211. The plate-like structure has a continuous blocking surface to ensure that the magnetic powder moves towards the periphery of the support plate. At the same time, the guide rib 212 of the plate-like structure can ensure that the magnetic powder on both sides of the guide rib 212 does not interfere with each other, thus ensuring the flowability of the magnetic powder.

[0067] In some embodiments, the guide rib 212 can be tilted above the support plate 211. The tilted design makes the guide rib 212 and the support plate 211 form a certain angle, so that the magnetic powder can move more smoothly to the periphery of the support plate 211 during vibration, reducing the accumulation of magnetic powder at the root of the guide rib 212.

[0068] The guide rib 212 can have a curved surface. When the magnetic powder comes into contact with the curved surface during vibration, the magnetic powder can be subjected to forces in more directions. In this way, the magnetic powder can not only move towards the periphery of the support plate 211, but also generate slight tumbling and diffusion, and the distribution of the magnetic powder will be more uniform, thus filling the annular mold cavity 901 more evenly and avoiding local density that is too high or too low.

[0069] In some embodiments, the support plate 211 may be constructed as a circle, with the circular support plate 211 having a circular periphery, which better corresponds to the annular mold cavity 901.

[0070] Multiple guide ribs 212 can be arranged on the support plate 211 in a rotationally symmetrical manner. The rotationally symmetrical arrangement of the multiple guide ribs 212 ensures that there is an identical guiding structure in every radial direction from the center to the periphery of the support plate 211, allowing the magnetic powder to be evenly distributed on the support plate 211. It can be understood that the guiding structure here refers to the channel formed by two adjacent guide ribs 212. When the fabric section 200 vibrates, the magnetic powder can be evenly distributed within the multiple guide structures, and the amount of magnetic powder sliding off at different positions on the periphery of the support plate 211 is basically the same, thus ensuring the uniform distribution of magnetic powder within the annular mold cavity 901. Simultaneously, the guide ribs 212 can also have a tendency to extend radially along the support plate 211 to better move the magnetic powder to the periphery of the support plate 211. Continue to refer to Figures 6 to 8 In some embodiments, the fabric section 200 can be connected to the feeding funnel 230, for example, the fabric section 200 can be connected to the second conical surface 232. Specifically, the guide rib 212 can be provided on the support plate 211 and connected to the support plate 211. At the same time, the guide rib 212 can also be connected to the outer wall of the feeding funnel 230, thus realizing the connection between the fabric section 200 and the feeding funnel 230. In some embodiments, the connection between the fabric section 200 and the feeding funnel 230 can be welding or riveting, etc. This disclosure does not specifically limit the connection method.

[0071] For ring magnets, to meet different application scenarios, ring magnets come in various sizes. Correspondingly, the mold 900 for manufacturing ring magnets and the annular cavity 901 within the mold 900 also come in various sizes. To improve the versatility of the magnetic powder feeding device in this disclosure, enabling it to manufacture ring magnets of various sizes, the magnetic powder feeding device may further include a discharge funnel 400, as shown in the reference. Figure 3 and Figure 4 A discharge funnel 400 is arranged around the outside of the feeding disc 210 to guide magnetic powder into the mold cavity 901. The mold cavity 901 can be the annular mold cavity 901 mentioned above. Thus, when the periphery of the support plate 211 corresponds to the opening trajectory of the annular mold cavity 901, but their dimensions do not match, the magnetic powder falling from the support plate 211 can be guided into the mold cavity 901 through the additional discharge funnel 400. Therefore, when preparing annular magnets of different sizes, the operator only needs to change the discharge funnel 400 of different sizes, without needing to change the feeding section 200, making the magnetic powder feeding device easier to use.

[0072] The magnetic powder feeding device disclosed herein may further include a truncated cone 500, which is located below the feeding disc 210 and spaced apart inside the discharge funnel 400, as shown in the reference. Figure 3 and Figure 4At this point, the truncated cone 500 can be located inside the discharge port of the discharge funnel 400. Thus, the outer side of the truncated cone 500 and the inner side of the discharge port of the discharge funnel 400 together form an annular gap. The annular gap formed by the discharge funnel 400 and the truncated cone 500 can guide the magnetic powder discharge. This annular gap can correspond in position and trajectory to the annular opening of the annular mold cavity 901. In this way, the magnetic powder falling from the structural support plate 211, after entering the discharge funnel 400, will only enter the annular mold cavity 901 through the annular gap formed by the discharge funnel 400 and the truncated cone 500. This avoids the situation where, with the discharge funnel 400 present, the magnetic powder falling from the support plate 211 only lands on the mold 900 and does not fall into the annular mold cavity 901.

[0073] It should be noted that while a frustum 500 may be provided in this disclosure, the specific arrangement of the frustum 500 is not limited. For example, the frustum 500 may be detachably mounted on the mold 900 used for preparing the ring magnet, or the frustum 500 may be fixedly mounted on the mold 900 used for preparing the ring magnet, or the frustum 500 may be integrally formed with the mold 900. By mounting the frustum 500 on the mold 900, the use of the mold 900 itself is not affected, and the need for a connecting structure between the outer side of the frustum 500 and the inner side of the discharge funnel 400 is avoided, further preventing the connecting structure from obstructing the magnetic powder.

[0074] The magnetic powder feeding device disclosed herein may further include a feeding hopper, which can be configured to feed magnetic powder into the feeding section 200 at a predetermined rate. In this way, the feeding hopper ensures that there is always sufficient magnetic powder on the feeding disc 210 while preventing magnetic powder accumulation on the disc 210, providing a continuous, stable, and controllable supply of magnetic powder for the subsequent vibratory feeding process. It should be noted that, in addition to ensuring the feeding rate, the feeding hopper needs to feed magnetic powder into the feeding section 200 at a certain rhythm to prevent magnetic powder from concentrating and falling into the feeding disc 210, thus avoiding magnetic powder accumulation.

[0075] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0076] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0077] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A magnetic powder fabric application device, characterized in that, include: Base; The fabric section has a fabric tray, which includes a support plate and radially arranged guide ribs located above the support plate; as well as A drive unit is used to drive the fabric part to reciprocate and vibrate relative to the base along a predetermined trajectory, so that the magnetic powder falling into the support plate is guided by the guide rib and slides off the periphery of the support plate.

2. The magnetic powder cloth application device according to claim 1, characterized in that, The drive unit is configured to drive the fabric part to reciprocate in the height direction as well as in the circumferential direction.

3. The magnetic powder cloth application device according to claim 1 or 2, characterized in that, The base includes a receiving groove; The fabric section includes a cover and a feeding funnel. The cover is disposed above the receiving groove, and the feeding funnel extends through the receiving groove in the height direction and is connected to the fabric tray at the bottom.

4. The magnetic powder cloth application device according to claim 3, characterized in that, The drive unit includes a linear component and a rotary component; The linear member is disposed in the receiving groove and is used to drive the cover to move in the height direction relative to the base; The rotating component includes a spring that is obliquely connected between the receiving groove and the cover, the spring being configured to guide the cover to rotate as it moves toward the receiving groove.

5. The magnetic powder cloth application device according to claim 4, characterized in that, The number of reeds is multiple, and they are arranged at circumferential intervals.

6. The magnetic powder cloth application device according to claim 4, characterized in that, The linear component includes: An armature is disposed within the cover; An electromagnet assembly is disposed in the receiving groove and configured to attract and repel the armature when energized.

7. The magnetic powder cloth application device according to claim 6, characterized in that, The armature and the electromagnet assembly are the same in number and their positions correspond one-to-one.

8. The magnetic powder cloth application device according to claim 6, characterized in that, The feeding funnel is a magnetic shielding component, and / or A first magnetic shielding element is provided between the feeding hopper and the electromagnet assembly.

9. The magnetic powder cloth application device according to claim 4, characterized in that, The linear component includes: A piezoelectric ceramic component is disposed in the receiving groove, and the piezoelectric ceramic component is connected to the cover component so as to drive the cover component to move in the height direction after being energized.

10. The magnetic powder cloth application device according to claim 3, characterized in that, The feeding funnel includes a first conical surface for receiving magnetic powder and a second conical surface connected below the first conical surface, wherein the inclination angle of the first conical surface is smaller than the inclination angle of the second conical surface relative to the horizontal direction, and the bottom end of the second conical surface is connected to the material feeding tray.

11. The magnetic powder cloth application device according to claim 3, characterized in that, The support plate has a protrusion and a recess surrounding the protrusion, the protrusion being located below the discharge port of the feeding funnel.

12. The magnetic powder cloth application device according to claim 1, characterized in that, The guide rib is a plate-like structure standing above the support plate.

13. The magnetic powder cloth application device according to claim 12, characterized in that, The guide rib is inclined above the support plate and has a curved surface.

14. The magnetic powder cloth application device according to claim 1, 12 or 13, characterized in that, The multiple guide ribs are arranged in a rotationally symmetrical manner on the support plate.

15. The magnetic powder cloth application device according to claim 1, characterized in that, It also includes a discharge funnel, which is arranged in a ring around the outside of the material distribution plate to guide the magnetic powder into the mold cavity.

16. The magnetic powder cloth application device according to claim 15, characterized in that, It also includes a truncated cone, which is located below the material feeding disc and spaced apart inside the discharge funnel. The annular gap formed by the discharge funnel and the truncated cone is used to guide the magnetic powder discharge.

17. The magnetic powder cloth application device according to claim 1, characterized in that, It also includes a feed hopper configured to feed magnetic powder into the fabric section at a predetermined rate.

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