Single-coil power inductor powder injection mechanism

Abstract

The utility model provides a unicoil power inductor powder injection mechanism which comprises a lower die holder and an upper die holder, the surface of the lower die holder is provided with a die cavity formed in a concave mode, the top of the upper die holder is connected with an external telescopic arm, the bottom of the upper die holder is provided with an upper die plate, and the upper die plate is provided with a vertically-through guide hole. A guide hole is formed in the upper die base, a powder guide unit is installed at the bottom of the upper die plate below the guide hole, a synchronous plate is installed above the upper die plate, a cylindrical connecting bolt is arranged on the synchronous plate, the bottom of the connecting bolt penetrates through the guide hole to be connected with the powder guide unit, a negative pressure air pipe is arranged on the upper die base, a negative pressure suction cup is connected to the negative pressure air pipe, and an air suction opening of the negative pressure suction cup is located above the top of the synchronous plate. A powder box is installed on one side of the upper portion of the upper die plate, a powder guide pipe is arranged on the lower portion of the powder box, and an outlet of the powder guide pipe is connected with a connecting bolt. After the scheme is adopted, the structure is reasonable, and the using effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of inductors, in particular to a powder injection mechanism for a single-coil power inductor. Background Art

[0002] Most of the existing power inductors are formed by powder pressing. After winding the hollow coil, it is fixedly implanted into the mold cavity, and the mold cavity is filled with metal powder and stamped. The existing implantation method is to drive the positioning arm plate through a telescopic arm, and several negative pressure suction cups are installed at the bottom of the positioning arm plate. The inductor coil is sucked by the negative pressure suction cups driven by an external negative pressure fan, and then sent to the mold cavity. Then, the powder tube is driven by the telescopic arm to align with the mold cavity for powder injection. When injecting powder in this way, the metal powder is likely to splash out of the mold cavity, and the impact force of the powder is relatively large, which is likely to push the coil to produce displacement. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a powder injection mechanism for a single-coil power inductor with reasonable structure and good use effect.

[0004] To achieve the above purpose, the technical solution provided by the utility model is: a powder injection mechanism for a single-coil power inductor, which includes a lower mold base and an upper mold base. A mold cavity formed by a downward depression is provided on the surface of the lower mold base. The top of the upper mold base is connected to an external telescopic arm. An upper template is provided at the bottom of the upper mold base. A guiding hole penetrating up and down is provided on the upper template. A powder guiding unit is installed at the bottom of the upper template below the guiding hole. A synchronous plate is installed above the upper template. A cylindrical connecting bolt is provided on the synchronous plate. The bottom of the connecting bolt passes through the guiding hole and is connected to the powder guiding unit. A negative pressure air pipe is provided on the upper mold base, and a negative pressure suction cup is connected to the negative pressure air pipe. The air suction port of the negative pressure suction cup is located above the top of the synchronous plate. A powder box is installed on one side of the upper part of the upper template. A powder guiding pipe is provided at the lower part of the powder box. The outlet of the powder guiding pipe is connected to the connecting bolt.

[0005] The powder guiding unit includes an arc-shaped powder guiding plate and a powder guiding column. Among them, there are two arc-shaped powder guiding plates. Hinge blocks are provided at the tops of the arc-shaped powder guiding plates. The hinge blocks are hinged to the fixed blocks at the bottom of the synchronous plate. After hinging, the inner arc surfaces of the two arc-shaped powder guiding plates face each other. The powder guiding column is movably installed between the two arc-shaped powder guiding plates. The top of the powder guiding column is connected to the bottom of the connecting bolt. Expansion pins are fixed on the upper parts of the opposite sides of the two arc-shaped powder guiding plates. A powder guiding channel penetrating up and down is provided in the powder guiding column. The powder guiding channel is connected to the inner cavity of the connecting bolt.

[0006] The upper parts of the two arc-shaped powder guiding plates are connected by an elastic ring, and the elastic ring is located below the expansion pin.

[0007] The lower part of the powder guiding column gradually expands to form a cone with a smaller top and a larger bottom, and the expansion pin contacts the conical surface.

[0008] The described powder guiding tube is made of a rigid material, and the outlet of the powder guiding tube is sleeved in the upper cavity of the connecting bolt.

[0009] After adopting the above scheme, when the coil enters the mold cavity, the external telescopic arm drives the upper mold base, powder guiding unit, etc. to move above the mold cavity, so that the bottoms of the two arc-shaped powder guiding plates are inserted into the mold cavity inlet; the negative pressure air duct drives the negative pressure suction cup to generate suction through an external suction fan, and while the powder guiding column rises, it pushes the expansion pin outward through the conical section; the lower parts of the two arc-shaped powder guiding plates move relatively away from each other, and the powder box starts to release powder. The structure after adopting this scheme is reasonable and has good use effect. Description of the Drawings

[0010] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0011] Figure 2 is Figure 1 an enlarged schematic view of part A of Detailed Embodiment

[0012] The following further describes the present invention in conjunction with all the drawings. The preferred embodiment of the present invention is as follows. Referring to Figure 1 and Figure 2 , a powder injection mechanism for a single-coil power inductor described in this embodiment includes a lower mold base 1 and an upper mold base 3. A mold cavity 2 formed by a downward recess is provided on the surface of the lower mold base 1. The top of the upper mold base 3 is connected to an external telescopic arm. A upper template 4 is provided at the bottom of the upper mold base 3. A through hole is provided vertically on the upper template 4. A powder guiding unit is installed at the bottom of the upper template 4 below the through hole. A synchronous plate 5 is installed above the upper template 4. A cylindrical connecting bolt 6 is provided on the synchronous plate 5. The bottom of the connecting bolt 6 passes through the through hole and is connected to the powder guiding unit. A negative pressure air duct 7 is provided on the upper mold base 3. A negative pressure suction cup 8 is connected to the negative pressure air duct 7. The suction port of the negative pressure suction cup 8 is located above the top of the synchronous plate 5. A powder box 13 is installed on one side of the upper part of the upper template 4. A powder guiding tube 14 is provided at the lower part of the powder box 13. The outlet of the powder guiding tube 14 is connected to the connecting bolt 6. The powder guiding tube 14 is made of a rigid material, and the outlet of the powder guiding tube 14 is sleeved in the upper cavity of the connecting bolt 6.

[0013] The powder guiding unit includes an arc-shaped powder guiding plate 9 and a powder guiding column 10. Among them, there are two arc-shaped powder guiding plates 9. A hinge block is provided at the top of the arc-shaped powder guiding plate 9, and the hinge block is hinged to the fixed block at the bottom of the synchronous plate 5. After being hinged, the inner arc surfaces of the two arc-shaped powder guiding plates 9 face each other. The powder guiding column 10 is movably installed between the two arc-shaped powder guiding plates 9. The upper parts of the two arc-shaped powder guiding plates 9 are connected by an elastic ring 12, and the elastic ring 12 is located below the expansion pin 11. The top of the powder guiding column 10 is connected to the bottom of the connecting bolt 6. An expansion pin 11 is fixed to the upper part of the opposite side of the two arc-shaped powder guiding plates 9. A powder guiding channel penetrating up and down is provided inside the powder guiding column 10, and the powder guiding channel is connected to the inner cavity of the connecting bolt. The lower part of the powder guiding column 10 gradually expands to form a cone with a small top and a large bottom, and the expansion pin 11 contacts the conical surface.

[0014] After adopting the above scheme, the negative pressure suction cup in the original state does not generate suction. Under the pulling force of the elastic ring, the lower parts of the two arc-shaped powder guiding plates approach each other relatively, forming a cone with a large top and a small bottom.

[0015] After the coil enters the mold cavity, the external telescopic arm drives the upper mold base, the powder guiding unit, etc. to move above the mold cavity, making the center of the cone of the two arc-shaped powder guiding plates directly face the mold cavity. The external telescopic arm drives the upper template to descend, and the upper template synchronously drives the bottoms of the two arc-shaped powder guiding plates to insert into the mold cavity entrance. At this time, the powder guiding channel is directly opposite the center of the coil.

[0016] The negative pressure air pipe drives the negative pressure suction cup to generate suction through an external exhaust fan. The suction force causes the synchronous plate to rise. While the synchronous plate rises, it pulls the powder guiding column to rise through the connecting bolt. While the powder guiding column rises, it pushes the expansion pin outward through the conical section.

[0017] Under the hinge action of the hinge block and the fixed block, the lower parts of the two arc-shaped powder guiding plates move away from each other relatively, forming an "eight" shape (the outer arc surface of the bottom of the arc-shaped powder guiding plate contacts the inner wall of the mold cavity entrance).

[0018] The powder box starts to release powder. The powder falls into the mold cavity after passing through the powder guiding pipe, the inner cavity of the connecting bolt, and the powder guiding channel of the powder guiding column. By adopting the vertical falling method, the powder falls naturally without generating an offset impact force. At the same time, the powder first fills the coil cavity, which can effectively prevent the coil from generating displacement. During the falling process of the powder, it is guided and blocked by the arc-shaped powder guiding plate. According to needs, an arc-shaped powder guiding plate with a large size and a small size can be used. When there is an overlapping area at the edges of the two arc-shaped powder guiding plates, the two arc-shaped powder guiding plates can be combined to form a conical cylinder; preventing the powder from splashing out of the mold cavity during the falling process.

[0019] After the powder is added, the external exhaust fan stops exhausting air, the negative pressure suction cup no longer generates suction, the synchronous plate loses force and descends, driving the connecting bolt to descend at the same time. The conical section no longer generates a thrust on the expansion pin. Under the contraction force of the elastic ring, the lower parts of the two arc-shaped powder guiding plates approach each other relatively. The external telescopic arm drives the upper template to rise and leave the lower mold base. The structure adopted in this scheme is reasonable and has a good use effect.

[0020] The above-described embodiments are only the preferred embodiments of the present utility model, and do not limit the scope of implementation of the present utility model. Therefore, any changes made according to the shape and principle of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A powder injection mechanism for a single-coil power inductor, which comprises a lower die base (1) and an upper die base (3). A die cavity (2) formed by concave is provided on the surface of the lower die base (1), and it is characterized in that: The top of the upper die base (3) is connected to the external telescopic arm. The bottom of the upper die base (3) is provided with an upper template (4). The upper template (4) is provided with a through guide hole. At the bottom of the upper template (4) below the guide hole, a powder guiding unit is installed. Above the upper template (4), a synchronous plate (5) is installed. The synchronous plate (5) is provided with a cylindrical connecting bolt (6). The bottom of the connecting bolt (6) passes through the guide hole and is connected to the powder guiding unit. The upper die base (3) is provided with a negative pressure air duct (7). A negative pressure suction cup (8) is connected to the negative pressure air duct (7). The air suction port of the negative pressure suction cup (8) is located above the top of the synchronous plate (5). On one side of the upper part of the upper template (4), a powder box (13) is installed. The lower part of the powder box (13) is provided with a powder guiding pipe (14). The outlet of the powder guiding pipe (14) is connected to the connecting bolt (6).

2. The powder injection mechanism for a single-coil power inductor according to claim 1, characterized in that: The powder guiding unit includes an arc-shaped powder guiding plate (9) and a powder guiding column (10). Among them, there are two arc-shaped powder guiding plates (9). The top of the arc-shaped powder guiding plate (9) is provided with a hinge block. The hinge block is hinged to the fixed block at the bottom of the synchronous plate (5). After being hinged, the inner arc surfaces of the two arc-shaped powder guiding plates (9) face each other. The powder guiding column (10) is movably installed between the two arc-shaped powder guiding plates (9). The top of the powder guiding column (10) is connected to the bottom of the connecting bolt (6). On the upper part of the opposite side of the two arc-shaped powder guiding plates (9), an expansion pin (11) is fixed. The powder guiding column (10) is provided with a through powder guiding channel inside. The powder guiding channel is connected to the inner cavity of the connecting bolt.

3. A powder injection mechanism for a single-coil power inductor according to claim 2, characterized in that: The upper parts of the two arc-shaped powder guiding plates (9) are connected by an elastic ring (12). The elastic ring (12) is located below the expansion pin (11).

4. A powder injection mechanism for a single-coil power inductor according to claim 2, characterized in that: The lower part of the powder guiding column (10) gradually expands to form a cone with a smaller upper part and a larger lower part. The expansion pin (11) is in contact with the conical surface.

5. The powder injection mechanism for a single-coil power inductor according to claim 2, wherein: The powder guiding pipe (14) is made of a rigid material. The outlet of the powder guiding pipe (14) is sleeved in the upper cavity of the connecting bolt (6).

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