A device for rapid and uniform filling of magnetic powder

Abstract

This invention provides a rapid and uniform magnetic powder filling device, relating to the field of magnetic powder molding and pressing technology. It includes: a fixedly positioned magnetic powder filling cylinder; a rotating sleeve with multiple radially extending magnet mounting slots along its circumferential wall; multiple sets of permanent magnets, each housed in a corresponding magnet mounting slot, capable of reciprocating along the radial direction of the magnetic powder filling cylinder; a changing alternating magnetic field is generated inside the magnetic powder filling cylinder to disperse magnetic agglomerates of the magnetic powder; promoting powder leveling and densification; this invention eliminates the magnetic agglomeration phenomenon between magnetic powders by preventing the magnetic moments of particles in the particle clusters formed by magnetic agglomeration from maintaining a state of unidirectional attraction; the vibration generated by the radial extension and contraction motion further improves the uniform filling effect of the magnetic powder by compacting and spreading the powder after the magnetic agglomeration has disappeared.

Description

Technical Field

[0001] This invention relates to the field of magnetic powder molding and pressing technology, specifically to a device for rapid and uniform filling of magnetic powder. Background Technology

[0002] The prior art, disclosed in patent number CN106881460B, discloses a rapid and uniform filling device for magnetic powder and a method for rapidly and uniformly filling magnetic powder using this device. The rapid and uniform filling device includes a feeding hopper, a support frame, a linear moving module, a mold cavity, and a magnetic field providing device. The feeding hopper includes a sealed end cap, an air inlet, a hopper fixing bracket, a vibrating device, a lower butterfly valve, and a driving device for the lower butterfly valve. The feeding hopper is connected to the linear moving module via the support frame, and an elastic block is provided at the connection between the support frame and the feeding hopper. The linear moving module includes a slider, a driving device, and a protective cavity. The support frame is fixedly connected to the slider by bolts. The magnetic field providing device consists of an iron core coil assembly and a coil current adjustment and control circuit. This device solves the problem of slow and uneven filling of flammable magnetic powder in the mold cavity, thereby improving powder molding efficiency and avoiding cracks in parts of the molded product due to uneven powder loading during the pressing process.

[0003] However, the device still has some obvious defects in use: the device uses an external magnetic field to make the magnetic powder flow along the direction of the magnetic field lines during the fall to achieve uniform distribution, but this fixed magnetic field structure will cause the magnetic powder to be attracted and agglomerated. For magnetic powder, this setting cannot achieve the expected effect. In addition, the device promotes the uniform distribution of magnetic powder through independently set magnetic mechanism and vibration mechanism, which results in poor correlation between the structures. Summary of the Invention

[0004] The purpose of this invention is to provide a device for rapid and uniform filling of magnetic powder to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A device for rapid and uniform filling of magnetic powder, comprising: A fixed magnetic powder filling cylinder, open at both axial ends; A rotating sleeve is rotatably and coaxially fitted onto the outside of the magnetic powder filling cylinder, and its cylinder wall has multiple radially extending magnet mounting slots along the circumference. Multiple sets of permanent magnets are provided, each of which is housed in a corresponding magnet mounting slot and is capable of reciprocating along the radial direction of the magnetic powder filling cylinder; wherein the magnetic poles of adjacent permanent magnets arranged circumferentially have opposite directions. A drive mechanism is used to drive the rotating sleeve to rotate about its axis; The rotational motion of the rotating sleeve is converted into the radial reciprocating motion of the permanent magnet through a vibration mechanism; The combined rotational and radial reciprocating motion of the permanent magnet generates a changing alternating magnetic field inside the magnetic powder filling cylinder to break up the magnetic agglomeration of the magnetic powder; at the same time, its radial motion component excites the magnetic powder filling cylinder to generate mechanical vibration to promote the leveling and densification of the powder. The magnetic powder filling cylinder is equipped with an openable and closable plugging mechanism at its lower opening to achieve powder filling and release.

[0006] Preferably, the magnetic powder filling cylinder is fixedly installed on the worktable, and a rotary bearing is provided on the outer sleeve of the magnetic powder filling cylinder. The rotary sleeve is fixedly installed on the outer ring of the rotary bearing.

[0007] Preferably, the driving mechanism is a drive motor fixedly mounted on the workbench, a drive gear is fixedly mounted on the drive shaft of the drive motor, and a wheel rim that meshes with the drive gear is fixedly mounted on the outer circumference of the rotating sleeve. The rotation of the drive motor drives the rotating sleeve to rotate.

[0008] Preferably, the vibration mechanism includes a push ring and a push rod. The push ring is fixedly mounted on the worktable and coaxially arranged with the rotating sleeve. The push rod is fixedly mounted one-to-one with each of the multiple sets of permanent magnets on the side away from the magnetic powder filling cylinder. The push rod extends outward through the assembly hole opened in the rotating sleeve and abuts against the inner wall of the push ring. The inner wall of the push ring is provided with multiple abutment protrusions, which compress the push rod to make it perform radial reciprocating motion.

[0009] Preferably, a compression spring is also provided between the push link and the outer wall of the rotating sleeve, so that the push link is always pressed against the inner wall of the push ring.

[0010] Preferably, the blocking mechanism is a magnetic powder receiving turntable, which has multiple feeding compartments arranged in a circular array. When the feeding compartments of the magnetic powder receiving turntable are misaligned with the bottom opening of the turntable, the turntable is in a blocked state, which is used for feeding and filling magnetic powder. When the feeding compartments of the magnetic powder receiving turntable are aligned with the bottom opening of the turntable, the turntable is in an open state, which is used for feeding and filling magnetic powder.

[0011] Preferably, a magnetic powder extrusion pusher is also provided above the magnetic powder filling cylinder in a lifting manner. Before and after the magnetic powder receiving turntable discharges material, the filling material is compacted by the magnetic powder extrusion pusher. A magnetic powder feeding mechanism is also provided above the magnetic powder filling cylinder in a movable manner, which feeds magnetic powder into the magnetic powder filling cylinder.

[0012] Preferably, the magnetic powder receiving turntable is also equipped with a magnetic powder pressing pusher on the side away from the magnetic powder filling cylinder, which presses and shapes the magnetic powder filling the feeding compartment.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention uses a high-speed rotating permanent magnet to create a constantly changing alternating magnetic field inside the magnetic powder filling cylinder. When the magnetic powder is in the alternating magnetic field, each magnetic powder particle will be rapidly and continuously magnetized and demagnetized as the magnetic field rotates and alternates. The direction of the magnetic moment of the particle itself will also rotate synchronously with the magnetic field and change repeatedly. As a result, the magnetic moments of each particle in the particle cluster formed by magnetic agglomeration no longer maintain the same direction of attraction, thereby eliminating the magnetic agglomeration phenomenon between magnetic powders. The permanent magnet of this invention not only serves as a mechanism for forming an alternating magnetic field, but also as a vibration mechanism for a magnetic powder filling cylinder. The vibration generated by the radial extension and contraction motion promotes the compaction and flattening of the powder that has lost its magnetic agglomeration, thereby further improving the uniform filling effect of the magnetic powder. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of the workbench and its connecting structure of the present invention; Figure 3 This is a schematic cross-sectional view of the magnetic powder filling cylinder in the sealed state according to the present invention; Figure 4 This is a schematic cross-sectional view of the magnetic powder filling cylinder in an open state according to the present invention; Figure 5 This is a three-dimensional schematic diagram of the workbench and its connection structure of the present invention.

[0015] In the diagram: 1. Magnetic powder filling cylinder, 2. Rotating sleeve, 3. Magnet mounting groove, 4. Permanent magnet, 5. Rotary bearing, 6. Worktable, 7. Drive motor, 8. Drive gear, 9. Wheel rim, 10. Push ring, 11. Push connecting rod, 12. Abutting protrusion, 13. Compression spring, 14. Magnetic powder receiving turntable, 15. Discharge compartment, 16. Magnetic powder extrusion push plate, 17. Magnetic powder pressing push plate. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1 to 5 The present invention provides a technical solution: Example 1: A device for rapid and uniform filling of magnetic powder, comprising: A fixed magnetic powder filling cylinder 1 has openings at both axial ends; The rotating sleeve 2 is rotatably and coaxially sleeved on the outside of the magnetic powder filling cylinder 1, and its cylinder wall has multiple radially extending magnet mounting grooves 3 along the circumference. Multiple sets of permanent magnets 4 are respectively housed in corresponding magnet mounting slots 3 and can reciprocate along the radial direction of the magnetic powder filling cylinder 1; wherein, the magnetic poles of the permanent magnets 4 arranged adjacent to each other in the circumferential direction are opposite. Drive mechanism, used to drive the rotating sleeve 2 to rotate about its axis; The rotational motion of the rotating sleeve 2 is converted into the radial reciprocating motion of the permanent magnet 4 through a vibration mechanism; The rotation and radial reciprocating combined motion of the permanent magnet 4 generates a changing alternating magnetic field inside the magnetic powder filling cylinder 1 to break up the magnetic agglomeration of the magnetic powder; at the same time, its radial motion component excites the magnetic powder filling cylinder 1 to generate mechanical vibration to promote the leveling and densification of the powder. The magnetic powder filling cylinder 1 has an openable and closable plugging mechanism at the lower opening to realize the filling and release of powder.

[0018] The magnetic powder filling cylinder 1 is fixedly installed on the workbench 6. The magnetic powder filling cylinder 1 is fitted with a rotary bearing 5, and the rotary sleeve 2 is fixedly installed on the outer ring of the rotary bearing 5.

[0019] In this embodiment, the magnetic powder filling cylinder 1 is vertically fixed on the workbench 6 by a bracket. The rotary bearing 5 is sleeved on the bottom outer wall of the magnetic powder filling cylinder 1, and its inner ring is fixedly connected to the magnetic powder filling cylinder 1. The rotary sleeve 2 is fixedly installed on the outer ring of the rotary bearing 5, so that it is supported and can rotate freely. On the cylinder wall of the rotary sleeve 2, 12 radially penetrating magnet mounting slots 3 are opened at equal intervals along the circumference.

[0020] Each magnet mounting slot 3 contains a set of permanent magnets 4. Each set of permanent magnets 4 is arranged radially and points to the center of the magnetic powder filling cylinder 1. The magnetic poles of the permanent magnets 4 in adjacent slots are opposite. The permanent magnets 4 as a whole can reciprocate radially within the magnet mounting slot 3.

[0021] The drive mechanism is replaced by a manual crank instead of a motor. It drives the wheel rim 9 fixed to the outer circumference of the rotating sleeve 2 through a set of sprockets and chains, causing the rotating sleeve 2 to rotate slowly.

[0022] The core of the vibration mechanism is a push ring 10 fixed on the worktable 6, whose inner diameter is slightly larger than the outer diameter of the rotating sleeve 2. A push rod 11 is fixedly connected to the back of each permanent magnet 4. The push rod 11 passes outward through the mounting hole on the rotating sleeve 2, and a ball is installed at its end. A compression spring 13 is sleeved on the push rod 11 and is located between the outer wall of the rotating sleeve 2 and the roller. It always pushes the ball inward so that it is pressed tightly against the inner wall of the push ring 10. On the inner wall of the push ring 10, multiple abutment protrusions 12 are cast at equal intervals. These protrusions are smooth and wavy.

[0023] During use, the operator adds a fixed amount of magnetic powder into the magnetic powder filling cylinder 1 through the magnetic powder feeding mechanism, and operates the blocking mechanism to turn it to the blocking position. Then, the operator turns the manual crank handle to drive the rotating sleeve 2 to rotate. When the roller at the end of the push rod 11 behind the permanent magnet 4 rolls along the inner wall of the push ring 10 under the action of the compression spring 13, it will encounter the abutment protrusion 12. The abutment protrusion 12 pushes the roller and the push rod 11 inward, thereby driving the permanent magnet 4 to make radial contraction motion towards the center of the magnetic powder filling cylinder 1. After rolling past the protrusion, under the action of the spring 13, the permanent magnet 4 returns to its original position. This cycle is repeated, realizing that the permanent magnet 4 performs regular radial reciprocating motion while revolving. During the radial movement of the permanent magnet 4 towards the magnetic powder filling cylinder 1, it contacts the outer wall of the magnetic powder filling cylinder 1 and thus generates vibration. In addition, the radial extension and contraction motion of the permanent magnet 4 can be made unstable by setting the asymmetrical abutment protrusion 12, thereby generating vibration on the rotating sleeve 2, and transmitting the vibration to the magnetic powder filling cylinder 1 through the rotating bearing 5.

[0024] A rotating and radially oscillating permanent magnet 4 generates an alternating magnetic field with rapidly changing intensity and direction inside the magnetic powder filling cylinder 1. This effectively breaks up the magnetic dipole agglomerations between magnetic powder particles. As the permanent magnet 4 moves inward, it gently impacts the outer wall of the magnetic powder filling cylinder 1, and its radial motion component is converted into a periodic excitation force on the cylinder. This causes the magnetic powder filling cylinder 1 to produce high-frequency, micro-amplitude mechanical vibrations. These vibrations are transmitted to the internal powder, promoting its leveling and compaction, and further breaking down non-magnetic soft agglomerates. Ultimately, under the combined action of vibration and magnetic field, the powder is rapidly and uniformly distributed within the magnetic powder filling cylinder 1. After filling, the bottom of the magnetic powder filling cylinder 1 becomes open, allowing the uniformly filled magnetic powder to fall under gravity, thus completing the material transfer.

[0025] Example 2: This embodiment is based on Embodiment 1, but with automation and structural enhancements, and is suitable for small-batch continuous production.

[0026] The workbench 6 is a cast iron platform, the magnetic powder filling cylinder 1 is made of non-magnetic stainless steel and is fixed to the table surface by a flange, the rotary bearing 5 is a high-precision crossed roller bearing, and the rotary sleeve 2 is an aluminum alloy part to reduce inertia.

[0027] The drive mechanism consists of a drive motor 7 fixed below the worktable 6. The drive gear 8 on its output shaft meshes with a precision wheel rim 9 fixed at the bottom of the rotating sleeve 2, enabling programmable speed control. The plugging mechanism is upgraded to a stepper motor-driven magnetic powder receiving turntable 14, which has multiple feeding compartments 15 evenly distributed around its circumference, enabling continuous operation. The magnetic powder extrusion pusher 16 is driven by a cylinder and pre-compacts the powder in the magnetic powder filling cylinder 1 after the magnetic powder is filled. The magnetic powder pressing pusher 17 is installed on another lifting platform, located on the other side of the magnetic powder receiving turntable 14. When the feeding compartment 15 carrying the powder rotates to the pressing station, the magnetic powder pressing pusher 17 presses the powder in the feeding compartment 15 into a blank.

[0028] In practical use, the magnetic powder receiving turntable 14 rotates to make the feeding compartment 15 engage or disengage with the lower opening of the magnetic powder filling cylinder 1. In the disengaged state, the upper surface of the magnetic powder receiving turntable 14 seals the bottom of the magnetic powder filling cylinder 1. At this time, the material entering the magnetic powder filling cylinder 1 accumulates inside and is compacted during vibration. To ensure the stability of the compacted material during its descent, it needs to be mechanically compacted again by the magnetic powder extrusion pusher 16 before feeding, so that the material can maintain its blank shape during descent. Then, the magnetic powder receiving turntable 14 is rotated rapidly to make the disengaged state... The feeding compartment 15 is matched with the lower opening of the magnetic powder filling cylinder 1. This transition process needs to be completed within one second. This is because the blank in the magnetic powder filling cylinder 1 remains stable inside the magnetic powder filling cylinder 1 due to its own inertia during the process. After the magnetic powder filling cylinder 1 and the feeding compartment 15 are fully matched, the blank falls as a whole, thus ensuring that the state of the blank does not change during the fall of the magnetic powder. At the same time, the magnetic powder extrusion pusher 16 pushes the formed blank downward again so that it completely enters the feeding compartment 15. Furthermore, a magnetic powder pressing pusher 17 is set at the rear end of the magnetic powder receiving turntable 14 to further shape and press the evenly laid magnetic powder.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for rapid and uniform filling of magnetic powder, characterized in that, include: A fixed magnetic powder filling cylinder, open at both axial ends; A rotating sleeve is rotatably and coaxially fitted onto the outside of the magnetic powder filling cylinder, and its cylinder wall has multiple radially extending magnet mounting slots along the circumference. Multiple sets of permanent magnets are provided, each of which is housed in a corresponding magnet mounting slot and is capable of reciprocating along the radial direction of the magnetic powder filling cylinder; wherein the magnetic poles of adjacent permanent magnets arranged circumferentially have opposite directions. A drive mechanism is used to drive the rotating sleeve to rotate about its axis; The rotational motion of the rotating sleeve is converted into the radial reciprocating motion of the permanent magnet through a vibration mechanism; The combined rotational and radial reciprocating motion of the permanent magnet generates a changing alternating magnetic field inside the magnetic powder filling cylinder to break up the magnetic agglomeration of the magnetic powder; at the same time, its radial motion component excites the magnetic powder filling cylinder to generate mechanical vibration to promote the leveling and densification of the powder. The magnetic powder filling cylinder is equipped with an openable and closable plugging mechanism at its lower opening to achieve powder filling and release.

2. The magnetic powder rapid and uniform filling device according to claim 1, characterized in that: The magnetic powder filling cylinder is fixedly installed on the workbench, and a rotary bearing is provided on the outer sleeve of the magnetic powder filling cylinder. The rotary sleeve is fixedly installed on the outer ring of the rotary bearing.

3. The magnetic powder rapid and uniform filling device according to claim 2, characterized in that: The driving mechanism is a drive motor fixedly mounted on the workbench. A drive gear is fixedly mounted on the drive shaft of the drive motor. A wheel rim that meshes with the drive gear is fixedly mounted on the outer circumference of the rotating sleeve. The rotation of the drive motor drives the rotating sleeve to rotate.

4. A rapid and uniform magnetic powder filling device according to claim 1 or 3, characterized in that: The vibration mechanism includes a push ring and a push rod. The push ring is fixedly mounted on the worktable and is coaxially arranged with the rotating sleeve. The push rod is fixedly mounted one-to-one with multiple sets of permanent magnets on the side away from the magnetic powder filling cylinder. The push rod extends outward through the assembly hole opened in the rotating sleeve and abuts against the inner wall of the push ring. The inner wall of the push ring has multiple abutting protrusions, which press the push rod to make it perform radial reciprocating motion.

5. The magnetic powder rapid and uniform filling device according to claim 4, characterized in that: A compression spring is also provided between the push link and the outer wall of the rotating sleeve, so that the push link is always pressed against the inner wall of the push ring.

6. The magnetic powder rapid and uniform filling device according to claim 5, characterized in that: The blocking mechanism is a magnetic powder receiving turntable. The magnetic powder receiving turntable has multiple feeding compartments arranged in a circular array. When the feeding compartments of the magnetic powder receiving turntable are misaligned with the bottom opening of the magnetic powder receiving turntable, the magnetic powder receiving turntable is in a blocked state, which is used for feeding and filling magnetic powder. When the feeding compartments of the magnetic powder receiving turntable are aligned with the bottom opening of the magnetic powder receiving turntable, the magnetic powder receiving turntable is in an open state, which is used for feeding and filling magnetic powder.

7. The magnetic powder rapid and uniform filling device according to claim 6, characterized in that: A magnetic powder extrusion pusher is also installed above the magnetic powder filling cylinder in a lifting manner. Before and after the magnetic powder receiving turntable discharges material, the filling material is compacted by the magnetic powder extrusion pusher. A magnetic powder feeding mechanism is also movable above the magnetic powder filling cylinder, which feeds magnetic powder into the magnetic powder filling cylinder.

8. The magnetic powder rapid and uniform filling device according to claim 7, characterized in that: The magnetic powder receiving turntable is also equipped with a magnetic powder pressing pusher on the side away from the magnetic powder filling cylinder. The magnetic powder filling the feeding compartment is pressed and shaped by the magnetic powder pressing pusher.

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