Double-layer feeder
By designing the feeding holes and temporary storage chambers on the feeding plate in the feeder, the density difference caused by uneven powder filling in the prior art is solved, and a more uniform powder filling and product quality are achieved. promote.
Patent Information
- Application Number
- CN202323529771.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-25
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-25
AI Technical Summary
When existing feeders fill large-area and thin powder products, they are prone to cause differences in body density and dimensional deformation, mainly due to the density differences caused by uneven powder filling in the mold cavity.
A double-layer feeder is designed, including a feeder with a downward opening and a slidable feeding plate. By setting feeding holes and temporary storage chambers on the feeding plate, the filling pressure of the powder is controlled to ensure each part of the cavity. Uniform density. The feeder slides through a cylinder and uses an elastic device to control its movement to ensure that the powder is filled evenly.
It effectively reduces the difference in powder density in the cavity, avoids product deformation and size differences, and improves product consistency and filling effect.
Smart Images
Figure CN222136061U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of powder dry pressing molding, and in particular relates to a double-layer feeder for filling powder into a mold cavity. Background Art
[0002] Dry pressing is to put powder into a metal mold, apply pressure to the powder in the mold to expel the gas in the gap, and finally form a blank with the same cross-section as the mold, and the upper and lower shapes are determined by the upper and lower pressure heads of the mold. In modern industry, dry pressing has a very wide range of applications in powder metallurgy, ceramics and magnetic materials. When filling powder into the mold cavity, a feeder with a certain powder storage capacity is generally used, such as Figure 1 As shown. The feeder 10 has a downwardly opened storage container 11, the opening of which is a feeding hole for filling powder into the mold. The storage container 11 is filled with powder, and the powder can be received from the feeding connector 12 to be replenished in the storage container. This feeder is used in many cases because of its simple structure, convenient control and ability to replenish powder in time. For products of general shape, the filling effect of powder in the mold is also good. However, for some large-area and thin products, using this feeder for feeding often results in the problem of easy deformation of the finished product.
[0003] The main reason for the deformation of thin products comes from the density difference at different positions of the green body, which is caused by inconsistent shrinkage after high-temperature sintering. The main reason for the difference in green body density is the uneven filling of powder in the mold cavity. Since the feeder's storage tank is full of powder, when filling the mold, the larger amount of powder in the storage tank exerts a greater pressure on the powder in the cavity, and the scraper plate squeezes the powder, which will cause the powder filling at the back of the cavity to be more than the front, resulting in a density difference between the front and back sides of the green body, and then causing size differences and deformation during sintering. For thicker products, the impact on the green body when using this type of feeder for filling is small and can be ignored, but for thin products, this density difference has a great impact on product quality. Summary of the invention
[0004] In view of the problems existing in the prior art, the main purpose of the utility model is to provide a feeder with small density difference between different parts when filling the cavity of a thin product.
[0005] In order to achieve the above-mentioned main purpose, the utility model provides a double-layer feeder for filling powder into the cavity of the mold, including a storage container with a downward opening, the storage container is provided with a feeding joint for replenishing powder into the storage container; the double-layer feeder also includes a feeding plate located below the storage container and closing the opening, the feeding plate can drive the storage container to move along the travel direction, and the storage container can slide relative to the feeding plate, the feeding plate is provided with a feeding hole that penetrates the feeding plate along the thickness direction of the feeding plate, the upper surface, the lower surface and the side wall of the feeding hole form a temporary storage cavity for temporarily storing powder, and the amount of powder that can be stored in the temporary storage cavity is determined according to the amount of powder required to fill the cavity; when the storage container slides to the opening covering the feeding hole, the powder in the storage container enters the temporary storage cavity from the opening, and when the feeding hole is located above the cavity, the powder in the temporary storage cavity enters the cavity, and at this time the opening does not cover the feeding hole.
[0006] It can be seen from the above scheme that by setting a feeding plate with a feeding hole, the powder enters the mold cavity from the temporary storage cavity of the feeding hole. The amount of powder stored in the temporary storage cavity is equal to or slightly larger than the amount of powder required to fill the cavity, and the feeding hole and the opening do not overlap at this time, so that the powder in the storage container will not produce pressure on the powder in the feeding hole, so that the pressure of the powder in the temporary storage cavity is small, and when filling the mold cavity, the phenomenon of more powder on the rear side of the cavity being filled than the front side will not occur, and thus the density difference of the powder filled in various parts of the cavity is small, and the product is not easy to deform and has no size difference.
[0007] According to a specific implementation of the utility model, the material storage container is connected to a driving device, and the driving device drives the material storage container to slide relative to the feeding plate.
[0008] According to a specific implementation of the utility model, the driving device is a cylinder, and the cylinder drives the storage container to reciprocate relative to the feeding plate.
[0009] According to a specific embodiment of the utility model, an elastic device is provided between the material storage container and the material feeding plate, and the relative movement between the material storage container and the material feeding plate is controlled by the elastic device.
[0010] According to a specific implementation of the utility model, along a direction perpendicular to the traveling direction, the length of the feeding hole corresponds to the length of the cavity.
[0011] It can be seen from the above scheme that the length of the feeding hole corresponds to the length of the cavity so that the double-layer feeder can fill the mold cavity by moving along the traveling direction.
[0012] According to a specific implementation of the utility model, along the traveling direction, the width of the feeding hole is smaller than the width of the cavity.
[0013] It can be seen from the above scheme that the powder in the temporary storage cavity is filled into the mold cavity by moving along the traveling direction.
[0014] According to a specific implementation of the utility model, the feeding holes are provided in plurality, and the arrangement of the plurality of feeding holes corresponds to the cross section of the cavity.
[0015] It can be seen from the above scheme that the arrangement of the multiple feeding holes corresponds to the cross section of the cavity, so that the cavity can be filled without moving the feeding plate when filling the powder.
[0016] According to a specific implementation of the utility model, the temporary storage cavity of the plurality of feeding holes can store an amount of powder equivalent to the amount of powder required to fill the mold cavity.
[0017] It can be seen from the above scheme that the amount of powder that can be stored in the temporary storage cavity is equivalent to the amount of powder required to fill the cavity, and quantitative powder supply to the cavity can be achieved, so that the consistency of the product is good.
[0018] According to a specific implementation of the utility model, after the multiple feeding holes are located directly above the mold cavity, the powder stored in the temporary storage cavity enters the mold cavity at the same time.
[0019] It can be seen from the above scheme that when the cavity is filled with powder, the entire cross section is filled at the same time, so that the filling effect is good and there will be no uneven density phenomenon.
[0020] According to a specific implementation of the utility model, the direction in which the accumulator slides relative to the feeding plate is parallel to the traveling direction.
[0021] It can be seen from the above scheme that the sliding direction of the accumulator is consistent with the moving direction of the feeder, which can make the feeder structure simple and convenient to control.
[0022] In order to more clearly illustrate the above-mentioned objectives, technical solutions and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a structural schematic diagram of an existing feeder;
[0024] Figure 2 It is a structural schematic diagram of a mold cavity filled with an embodiment of the utility model;
[0025] Figure 3 It is a schematic diagram of the structure of Embodiment 1 of the present utility model;
[0026] Figure 4 It is a schematic diagram of the structure of the feeding plate in Example 1 of the utility model;
[0027] Figure 5 It is a schematic diagram of the structure of the storage container in Example 1 of the utility model;
[0028] Figure 6 This is a schematic diagram of the structure of Example 1 of the utility model when powder is filled into the mold cavity;
[0029] Figure 7 It is a structural schematic diagram of Embodiment 2 of the present utility model;
[0030] Figure 8 It is a schematic diagram of the structure of the feeding plate in Example 2 of the utility model;
[0031] Fig. 9 yes Figure 8 A is a partial enlarged schematic diagram;
[0032] Fig.10 It is a schematic structural diagram of Example 2 of the utility model when powder is filled into the mold cavity. DETAILED DESCRIPTION
[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but it is easy for those skilled in the art to understand that the present invention can also be implemented in other ways different from those described herein. Therefore, other possible implementation methods that can be known by those skilled in the art based on the embodiments described in this application all belong to the protection scope of this application.
[0034] Example 1
[0035] Figure 2 Schematic diagram of the structure of the mold cavity filled with the embodiment of the utility model, as shown in FIG. Figure 2 As shown schematically, the mold cavity 21 is formed by a female mold 22 and a lower mold 23. The depth of the cavity 21 is relatively shallow. After the cavity 21 is filled with powder, the upper mold is covered, and the upper mold and / or the lower mold 23 move to extrude the powder to form a blank. When such a cavity is fed with materials using an existing feeder, the powder at the rear side of the cavity is often filled with more powder than at the front side, resulting in density differences between the front and rear sides of the blank, which in turn causes product deformation or size differences.
[0036] like Figures 3 to 5As shown, the double-layer feeder of the utility model embodiment includes a accumulator 31 and a feeding plate 32. The opening of the accumulator 31 is downwardly arranged on the feeding plate 32 and can move relative to the feeding plate 32. The upper surface 322 of the feeding plate 32 closes the opening of the accumulator 31. The accumulator 31 has a feeding connector 311 for supplying powder from a powder storage device to the accumulator. The feeding plate 32 is provided with a feeding hole 321 that passes through the upper and lower surfaces of the feeding plate 32. The feeding hole 321 shown in the figure is in the shape of a long strip. The length direction of the feeding hole 321 is perpendicular to the travel direction. The length of the feeding hole 321 corresponds to the length of the mold cavity in this direction and can be slightly larger than the length of the mold cavity in this direction. The width of the feeding hole 321 along the travel direction is smaller than the width of the mold cavity in this direction. The upper surface, lower surface and side wall of the feeding hole 32 form a temporary storage cavity for temporarily storing powder. The amount of powder that can be stored in the temporary storage cavity depends on the amount of powder required to fill the cavity, and can be slightly larger than the amount of powder required by the cavity.
[0037] One end of the feeding plate 32 is connected to a cylinder 324 as a driving device, and the accumulator 31 is fixedly connected to the piston rod 323 of the cylinder 324, so that it can slide along the feeding plate 32 under the push of the cylinder 324. In this embodiment, the feeding plate 32 drives the accumulator 31 to move along the traveling direction, and the direction in which the cylinder 324 pushes the accumulator 31 to move is consistent with the moving direction of the feeding plate 32.
[0038] In this embodiment, Figure 2 When the mold cavity shown in FIG. supplies powder, Figure 6 As shown, the cylinder 324 can first drive the accumulator 31 to slide along the upper surface 322 of the feeding plate 32 to above the feeding hole 321, and the opening of the accumulator 31 covers the feeding hole 321 so that the powder in the accumulator 31 fills the feeding hole 321, even if the powder is stored in the temporary storage chamber, and then the accumulator 31 returns to its original position, and its opening and the feeding hole 321 no longer overlap, and the opening of the accumulator 31 is closed by the upper surface 322. The feeding plate 32 moves toward the mold cavity along the moving direction under the action of the driving device, and when the feeding hole 321 is located above the cavity 21, the powder stored in the temporary storage chamber falls from the feeding hole 321 into the cavity 21, and the filling of the cavity 21 is completed with the movement of the feeding plate 32. Since the thickness of the feeding plate 32 itself is limited, the pressure exerted on the powder in the cavity is very small, and the density of the powder filled into the cavity is uniform. After the cavity 21 is filled, the feeding plate 32 with the feeding hole 321 can act as a scraper when it returns in the direction opposite to the traveling direction, and the excess powder can be stored in the temporary storage chamber. After the feeding plate is separated from the cavity, the mold performs extrusion molding. After the feeding hole 321 is filled again by the storage tank 31, this part of the powder is located at the bottom of the temporary storage chamber and enters the cavity when the feeding plate 32 fills the cavity. Therefore, compared with the existing feeder, the amount of waste powder is small and the powder can be fully utilized.
[0039] In other embodiments, the device for driving the accumulator to move relative to the loading plate may be an elastic device or the accumulator may be provided with other driving devices.
[0040] Example 2
[0041] like Figures 7 to 9 As shown, the double-layer feeder includes a hopper 41 and a feed plate 42. The opening of the hopper 41 is downwardly arranged on the feed plate 42 and can move relative to the feed plate 42. The upper surface 422 of the feed plate 42 closes the opening of the hopper 41. The hopper 41 has a feed joint for supplying powder from a powder storage device to the hopper 41. The feed plate 42 is provided with a plurality of feed holes 421 penetrating the upper and lower surfaces of the feed plate 42. The arrangement of the plurality of feed holes 421 is consistent with the mold cavity. The length of the feed holes 421 arranged in a direction perpendicular to the travel direction is consistent with the length of the mold cavity in this direction. The width of the feed holes 421 along the travel direction is consistent with the width of the mold cavity in this direction, that is, the arrangement of the plurality of feed holes corresponds to the cross section of the mold cavity. The upper surface, lower surface and side wall of the plurality of feed holes 42 form a temporary storage cavity for temporarily storing powder. The amount of powder that can be stored in the temporary storage cavity is equivalent to the amount of powder required to fill the mold cavity.
[0042] One end of the feeding plate 42 is connected to a cylinder 424 as a driving device, and the accumulator 41 is fixedly connected to the piston rod 423 of the cylinder 424, so that it can slide along the feeding plate 42 under the push of the cylinder 424. In this embodiment, the feeding plate 42 drives the accumulator 41 to move along the traveling direction, and the direction in which the cylinder 424 pushes the accumulator 41 to move is consistent with the moving direction of the feeding plate 42.
[0043] In this embodiment, Figure 2 When the mold cavity shown in FIG. supplies powder, Fig.10As shown, the double-layer feeder can be moved to a position where the feeding hole 421 is directly above the mold cavity, at which time the mold cavity is in an unopened position, and then the cylinder 424 drives the accumulator 41 to slide along the upper surface 422 of the feeding plate 42 to the top of the feeding hole 421, and the opening of the accumulator 41 covers all the feeding holes 421 so that the powder in the accumulator 41 fills the feeding holes 421, even if the powder is stored in the temporary storage chamber, and then the accumulator 41 returns to its original position, the opening and the feeding hole 421 no longer have an overlapping part, and the upper surface 422 closes the opening of the accumulator 41. Then the mold cavity is opened, and the powder stored in the temporary storage chamber falls from the feeding hole 421 into the mold cavity 21, completing the filling of the mold cavity. Multiple feeding holes 421 are filled into the mold cavity 21 at the same time, and the heights of the feeding holes 421 are consistent, so there is no pressure difference in filling. According to the pre-setting, the powder in the temporary storage chamber just fills the mold cavity, thereby completing the quantitative filling of the mold cavity. After the filling is completed, the feeding plate 42 is removed and the mold completes the extrusion molding. During the next filling, the feeding plate 42 moves to the top of the unopened mold cavity, the accumulator 41 moves and fills the feeding hole 421, and then the accumulator 41 moves to the position where the opening is closed by the upper surface, the mold cavity is opened, and the feeding hole 421 fills the model.
[0044] This embodiment fills the mold cavity quantitatively, that is, the amount of powder filled into the mold cavity each time is constant, so the product has good consistency and uniform density. This embodiment can be used to fill products with larger cross-sections and thinner thicknesses. This embodiment can also be used to fill mold cavities with inconsistent depths. At locations with larger depths, the density of the feeding holes can be large or the size of the feeding holes can be large, and at locations with smaller depths, the density of the feeding holes can be small or the size of the feeding holes can be small, so that mold cavities of different depths can be filled uniformly.
[0045] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the scope of the present invention. Any person skilled in the art can make some improvements without departing from the scope of the present invention, that is, any changes or improvements made according to the present invention should be covered by the protection scope of the present invention.
Claims
1. A double-layer feeder for filling powder into a mold cavity of a mold, comprising a hopper with a downward opening, wherein the hopper is provided with a feed connector for replenishing powder into the hopper; characterized in that: The double-layer feeder further comprises a feeding plate located below the accumulator and closing the opening, the feeding plate can drive the accumulator to move along the travel direction, and the accumulator can slide relative to the feeding plate, the feeding plate is provided with a feeding hole penetrating the feeding plate along the thickness direction of the feeding plate, the upper surface, the lower surface and the side wall of the feeding hole form a temporary storage cavity for temporarily storing powder, and the amount of powder that can be stored in the temporary storage cavity is determined according to the amount of powder required to fill the cavity; When the storage container slides to the opening covering the feeding hole, the powder in the storage container enters the temporary storage cavity from the opening. When the feeding hole is located above the cavity, the powder in the temporary storage cavity enters the cavity. At this time, the opening does not cover the feeding hole.
2. The double-layer feeder according to claim 1, characterized in that: The material storage container is connected to a driving device, and the driving device drives the material storage container to slide relative to the feeding plate.
3. The double-layer feeder according to claim 2, characterized in that: The driving device is a cylinder, and the cylinder drives the storage container to reciprocate relative to the feeding plate.
4. The double-layer feeder according to claim 1, characterized in that: An elastic device is arranged between the material storage container and the material feeding plate.
5. The double-layer feeder according to any one of claims 1 to 4, characterized in that: Along a direction perpendicular to the traveling direction, the length of the feeding hole corresponds to the length of the cavity.
6. The double-layer feeder according to claim 5, characterized in that: Along the traveling direction, the width of the feeding hole is smaller than the width of the cavity.
7. The double-layer feeder according to any one of claims 1 to 4, characterized in that: The feeding holes are provided in plurality, and the arrangement of the plurality of feeding holes corresponds to the cross section of the cavity.
8. The double-layer feeder according to claim 7, characterized in that: The temporary storage chamber of the plurality of feeding holes can store an amount of powder equivalent to the amount of powder required to fill the mold cavity.
9. The double-layer feeder according to claim 8, characterized in that: After the multiple feeding holes are located directly above the mold cavity, the powder stored in the temporary storage cavity enters the mold cavity at the same time.
10. The double-layer feeder according to any one of claims 1 to 4, characterized in that: The direction in which the accumulator slides relative to the feeding plate is parallel to the traveling direction.