Powder supply device

Abstract

The invention provides a powder supply device capable of supplying powder with reduced density unevenness to a roller device. A powder supply device is provided with: a housing in which a space for accommodating a powder as a raw material is defined, and which has a discharge port that opens downward at the lower end; a screw which is accommodated in the housing, has a rotating shaft, and conveys the powder toward the discharge port by rotating around the rotating shaft; and a dispersion plate provided downstream of the discharge port and having a plurality of openings.

Description

Technical Field

[0001] The present disclosure relates to a powder supply device. Background Art

[0002] Patent document 1 discloses a device for manufacturing a thin film electrode of a battery. The device includes a powder supply device and a roller device, and the roller device includes a pair of rollers. The powder supply device supplies powder as a raw material between the pair of rollers of the roller device. The roller device compacts the powder supplied from the powder supply device with a pair of rollers, and transfers the compacted powder to a sheet member.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2023-172275

[0004] As a powder supply device described in Patent Document 1, a screw feeder capable of continuously supplying powder is considered. In the screw feeder, the position of the blades of the screw changes periodically, and the powder is extruded in conjunction with the cycle. Therefore, the pressure of the extruded powder changes periodically. The periodic change in the pressure of the extruded powder may cause the powder supplied to the roller device to have uneven density and affect the quality of the electrode. The present disclosure provides a technology that can supply powder in a state of reduced density unevenness to a roller device. Summary of the invention

[0005] A powder supply device according to one aspect of the present disclosure comprises: a housing, which divides a space for accommodating powder as a raw material, and has a discharge port opened downward at the lower end; a screw, which is accommodated in the above-mentioned housing and has a rotating shaft, and transports the above-mentioned powder toward the above-mentioned discharge port by rotating around the above-mentioned rotating shaft; and a dispersion plate, which is arranged downstream of the above-mentioned discharge port and has a plurality of openings.

[0006] According to the present disclosure, powder in a state where density unevenness is reduced can be supplied to the roller device. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a diagram for explaining the outline of a film forming device included in a powder supply device according to an embodiment.

[0008] Figure 2 (A) and (B) are perspective views showing an example of a dispersion plate.

[0009] Figure 3 (A) is a perspective view showing an example of a dispersion plate. Figure 3 (B) is along Figure 3 (A) is a cross-sectional view taken along line III-III.

[0010] Figure 4 (A) is a perspective view showing an example of a dispersion plate.Figure 4 The (B) shows Figure 4 a top view of the dispersion plate shown in (A) of Figure 4 The (C) of Figure 4 is a cross-sectional view taken along the IV-IV line of (B) of

[0011] Figure 5 The (A) and (B) of Detailed Embodiments

[0012] Embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are assigned to the same elements, and repeated descriptions are omitted. The dimensional ratios of the drawings do not have to be the same as those described. The terms "upper", "lower", "left", and "right" are used for convenience based on the illustrated state.

[0013] [An Example of a Powder Supply Device]

[0014] Figure 1 is a diagram for explaining an outline of a film-forming device included in a powder supply device according to an embodiment. Figure 1 The film-forming device 1 shown is a device for manufacturing an electrode used in a battery or the like. The film-forming device 1 is a so-called dry film-forming device, and manufactures a thinned (sheeted) electrode by compacting a powder as a raw material.

[0015] The powder refers to a powdery or granular substance. The size of the powder can be a particle diameter of several micrometers to about several hundred micrometers. The shape of the powder can be spherical, rod-shaped, or amorphous, etc. The material of the powder is, for example, an electrode material powder that is an electrode material for a positive electrode or a negative electrode of a storage battery. As a specific example, the material of the positive electrode is an active material, a conductive assistant, a binder, etc. of a lithium compound containing oxides such as cobalt, manganese, nickel, and iron phosphate, and the material of the negative electrode is an active material such as graphite and carbon, a conductive assistant, a binder, etc. The film-forming device 1 can use not only the above-mentioned powder but also various powders.

[0016] The film-forming device 1 includes a powder supply device 2 and a roller device 3. The powder supply device 2 is a device for supplying powder to the roller device 3. The powder supply device 2 includes a screw feeder 4 as a conveying device. The screw feeder 4 has a housing 40 and a screw 41. The housing 40 defines a space for accommodating the powder P inside. The powder P is introduced into the inside of the housing 40 from the inlet 40a of the powder hopper provided in the housing 40.

[0017] The screw 41 is housed inside the housing 40. The screw 41 has a rotating shaft 41a. The screw 41 is arranged in the housing 40 with the rotating shaft 41a in the vertical direction. A spiral blade is provided on the rotating shaft 41a. A driving device 42 is connected to the upper end of the rotating shaft 41a. The driving device 42 rotates the screw 41 about the rotating shaft 41a. An example of the driving device 42 is a motor.

[0018] The housing 40 has a discharge port 40b opening downward at its lower end. The screw 41 conveys the powder P toward the discharge port 40b by rotation. The powder P is supplied to the roller device 3 through the discharge port 40b.

[0019] Here, a dispersion plate 5 and an additional dispersion plate 6 are provided downstream of the lower end of the screw feeder 4, that is, downstream of the discharge port 40b. The dispersion plate 5 and the additional dispersion plate 6 each have a plurality of openings. The powder P discharged from the screw feeder 4 is supplied to the roller device 3 through the openings of the dispersion plate 5 and the additional dispersion plate 6. Details of the dispersion plate 5 and the additional dispersion plate 6 will be described later.

[0020] The roller device 3 includes a pair of rotatable rollers 30, 31. The roller 30 located on the left side in the figure can rotate to the right, and the roller 31 located on the right side can rotate to the left. The powder P is supplied from the powder supply device 2 between the pair of rollers 30, 31. The powder P is compacted by the pair of rollers 30, 31 to form a thin film LY. The thin film LY is transferred to a conveyor 32 located below the pair of rollers 30, 31 and conveyed.

[0021] [Details of the dispersion plate]

[0022] The dispersion plate 5 and the additional dispersion plate 6 have the same shape as the discharge port 40b. When the discharge port 40b is circular, the dispersion plate 5 and the additional dispersion plate 6 are in the shape of a disc. When the discharge port 40b is rectangular, the dispersion plate 5 and the additional dispersion plate 6 are in the shape of a rectangular plate. The dispersion plate 5 and the additional dispersion plate 6 are arranged coaxially with the discharge port 40b. As a more specific example, the upper end of the dispersion plate 5 is connected to the lower end of the discharge port 40b, and the upper end of the additional dispersion plate 6 is connected to the lower end of the dispersion plate 5.

[0023] Figure 2 (A) is a perspective view showing an example of the dispersion plate. As Figure 2As shown in (A) of FIG. , the dispersion plate 5 has a plurality of slits SL (an example of a plurality of openings). The plurality of slits SL are formed by a frame body 50 and a plurality of slit members 51. As an example, the frame body 50 is an annular member and forms a through port T1 communicating with the discharge port 40b of the screw feeder 4. The plurality of slit members 51 are long members and are arranged at intervals in the through port T1. The plurality of slit members 51 may be arranged at equal intervals. In this case, the plurality of slits SL formed between the plurality of slit members 51 also become equally spaced. Both ends of each slit member are connected to the inner side wall of the frame body 50.

[0024] As an example, the plurality of slit members 51 are each a mountain-shaped member. Each slit member has a pair of first plate members 510 and second plate members 511. The first plate member 510 is arranged such that the main surface thereof is inclined with respect to the conveying direction (negative Z direction) of the powder P by the screw 41. That is, the perpendicular line of the main surface of the first plate member 510 is in a state inclined with respect to the horizontal direction. In the figure, the first plate member 510 is inclined such that the lower end of the main surface faces the negative X direction. Similarly, the second plate member 511 is inclined such that the lower end of the main surface faces the positive X direction. The upper ends of the main surfaces of the first plate member 510 and the second plate member 511 are connected to each other. With the above configuration, the first plate member 510 and the second plate member 511 constitute a mountain-shaped member. When the powder P passes through the plurality of slits SL of the dispersion plate 5, it is broken, mixed, or dispersed by the first plate member 510 and the second plate member 511. Thereby, the density unevenness of the powder P is reduced.

[0025] The dispersion plate 5 is not limited to the above structure, and variously shaped slit members can be adopted. Figure 2 (B) of FIG. is a perspective view showing an example of the dispersion plate. As Figure 2 shown in (B) of FIG. , the dispersion plate 5A has a plurality of slits SL (an example of a plurality of openings). In the dispersion plate 5A, the plurality of slits SL are formed by a frame body 50A and a plurality of slit members 51A. Compared with the dispersion plate 5, the shape of the slit members of the dispersion plate 5A is different, and the others are the same. The following will focus on the differences and omit the repeated descriptions.

[0026] As an example, the plurality of slit members 51A are each plate members. The plate members are arranged such that the main surface thereof is inclined with respect to the conveying direction of the powder P by the screw 41. That is, the perpendicular line of the main surface of the plate member is in a state inclined with respect to the horizontal direction. In the figure, the plate member is inclined such that the lower end of the main surface faces the positive X direction. When the powder P passes through the plurality of slits SL of the dispersion plate 5A, it is broken, mixed, or dispersed by each slit member. Thereby, the density unevenness of the powder P is reduced.

[0027] Figure 3 (A) of FIG. is a perspective view showing an example of the dispersion plate, Figure 3(B) is along Figure 3 A cross-sectional view taken along line III-III of (A) of Figure 3 As shown in (A) of Figure 3 As shown in (A) and (B) of , in the dispersion plate 5B, a plurality of slits SL (an example of a plurality of openings) are formed by a frame body 50B and a plurality of slit members 51B. Compared with the dispersion plate 5, the shape of the slit members of the dispersion plate 5B is different, and the others are the same. Hereinafter, the differences will be mainly described, and repeated descriptions will be omitted.

[0028] As an example, the plurality of slit members 51B are respectively plate members. The plurality of slit members 51B include non-inclined slit members and inclined slit members 511B (an example of at least one slit member). The number of non-inclined slit members and the number of inclined slit members 511B are arbitrary. The non-inclined slit members are arranged near the center of the dispersion plate 5B in the arrangement direction (X direction), and the inclined slit members 511B are arranged at positions closer to the outer edge than the center of the dispersion plate 5B in the arrangement direction.

[0029] The non-inclined slit members are arranged such that the perpendicular to the main surface of the plate member is in the horizontal direction. The inclined slit members 511B are arranged such that their main surfaces are inclined with respect to the conveying direction of the powder P by the screw 41. That is, the perpendicular to the main surface of the inclined slit member 511B is in a state inclined with respect to the horizontal direction. In the figure, the inclined slit members 511B are inclined such that the lower end is closer to the outer edge of the dispersion plate 5B than the upper end. The powder P is broken, mixed or dispersed by each slit member when passing through the plurality of slits SL of the dispersion plate 5A.

[0030] And, by using plate members with different inclinations, the density of the powder P in the horizontal direction (width direction) of the through-port T1 is adjusted. Regarding the density of the powder P inside the housing 40, the portion closer to the inner side wall of the housing 40 is lower than the portion closer to the center in the horizontal direction. This is because the inner side wall of the housing 40 becomes a resistance to the flow of the powder P. Therefore, the density distribution of the powder P reaching the discharge port 40b and the through-port T1 also tends to be lower toward the edge (outer side). The inclined slit members 511B guide the powder P toward the outer edge of the dispersion plate 5B. Thereby, the density difference between the powder supplied from the portion close to the inner side wall of the frame and the powder supplied from the portion close to the center is alleviated, and the density unevenness in the horizontal direction of the through-port T1 is further reduced.

[0031] Figure 4 (A) of is a perspective view showing an example of a dispersion plate, Figure 4 (B) of is Figure 4 A top view of the dispersion plate shown in (A) of Figure 4 (C) of is along Figure 4Cross-sectional view taken along line IV-IV of (B). As Figure 4 shown in (A) of FIG. , the dispersion plate 5C has a plurality of slits SL, SL1 (an example of a plurality of openings). As Figure 4 shown in (A) to (C) of FIG. , in the dispersion plate 5B, the plurality of slits SL, SL1 are formed by an outer frame 50C, an inner frame 52, and a plurality of slit members 51C.

[0032] The outer frame 50C is the same as the frame 50 of the dispersion plate 5 and forms a through-hole T1. The diameter of the inner frame 52 is smaller than that of the outer frame 50C. The inner frame 52 is disposed inside the outer frame 50C coaxially therewith. The inner frame 52 is supported by a plurality of arm portions 53 erected radially inward from the inner side wall of the outer frame 50C. The plurality of arm portions 53 are each plate-like members and are connected to the outer side wall of the inner frame 52. Thereby, a gap is formed between the inner frame 52 and the outer frame 50C, and a plurality of slits SL1 are formed by partitioning the gap by the plurality of arm portions 53.

[0033] The plurality of slit members 51C are provided at intervals on the inner side wall of the inner frame 52. As an example, the plurality of slit members 51C are each plate members. The plate members are arranged such that the perpendicular to the main surface is in the horizontal direction. Thereby, a plurality of slits SL are formed between the plurality of slit members 51C.

[0034] The powder P is broken, mixed, or dispersed by each slit member when passing through the plurality of slits SL, SL1 of the dispersion plate 5C.

[0035] Moreover, the outer side wall of the inner frame 52 is inclined such that the lower end is closer to the outer frame 50C than the upper end. Therefore, the plurality of slits SL1 guide the passing powder P toward the outer edge of the dispersion plate 5C. As described above, the density distribution of the powder P reaching the discharge port 40b and the through-hole T1 tends to be lower toward the edge. By using the dispersion plate 5C, the density difference between the powder supplied from the portion near the edge of the dispersion plate 5C and the powder supplied from the portion near the center is alleviated, and the density non-uniformity in the horizontal direction of the through-hole T1 is further reduced.

[0036] Figure 5 (A) of FIG. is a plan view showing an example of the dispersion plate. As Figure 5 shown in (A) of FIG. , the dispersion plate 5D has lattice-shaped openings SL2 (an example of a plurality of openings). As Figure 5 shown in (A) of FIG. , in the dispersion plate 5D, the lattice-shaped openings SL2 are formed by a frame body 50D and a net member 54D. The frame body 50D is the same as the frame 50 of the dispersion plate 5 and forms a through-hole T1. The net member 54D is supported on the inner side wall of the frame body 50D. The net member 54D may be a wire stretched in a lattice shape or a plate member arranged in a lattice. The powder P is broken, mixed, or dispersed by the net member 54D when passing through the lattice-shaped openings SL2 of the dispersion plate 5D.

[0037] Figure 5 The (B) of [description] is a top view showing an example of the dispersion plate. As Figure 5 shown in the (B) of [description], the dispersion plate 5E has lattice-shaped openings SL3, SL4 (an example of a plurality of openings). As Figure 5 shown in the (B) of [description], in the dispersion plate 5E, the lattice-shaped openings SL3, SL4 are formed by an outer frame 50E, an inner frame 52E, an inner net member 54E, and an outer net member 55.

[0038] The outer frame 50E is the same as the frame 50 of the dispersion plate 5 and forms a through-port T1. The diameter of the inner frame 52E is smaller than that of the outer frame 50E. The inner frame 52E is disposed inside the outer frame 50E coaxially with the outer frame 50E. An outer net member 55 is disposed between the inner frame 52E and the outer frame 50E. An inner net member 54E is disposed inside the inner frame 52E. The outer net member 55 and the inner net member 54E may be wire materials stretched into a lattice shape or plate members arranged in a lattice shape. The powder P is broken, mixed, or dispersed by the outer net member 55 and the inner net member 54E when passing through the lattice-shaped openings SL3, SL4 of the dispersion plate 5E.

[0039] Moreover, the lattice pitch of the outer net member 55 is larger than that of the inner net member 54E. Therefore, the lattice-shaped opening SL4 provided on the edge side of the dispersion plate 5E is larger than the lattice-shaped opening SL3 provided at the center of the dispersion plate 5E. Thus, the powder P can pass more easily through the edge side of the dispersion plate 5E than through the center of the dispersion plate 5E. As described above, the density distribution of the powder P reaching the discharge port 40b and the through-port T1 has a tendency to be lower toward the edge. By using the dispersion plate 5E, the density difference between the powder supplied from the portion near the edge of the dispersion plate 5E and the powder supplied from the portion near the center is alleviated, and the density non-uniformity in the horizontal direction of the through-port T1 is further reduced.

[0040] The additional dispersion plate 6 can adopt an appropriate structure from the dispersion plates 5 to 5E. The additional dispersion plate 6 may also be arranged such that at least a part of the plurality of openings of the connected dispersion plates does not overlap with the plurality of openings of the additional dispersion plate 6 when viewed from the vertical direction. For example, in the case where the dispersion plate 5 having a mountain-shaped slit member and the additional dispersion plate 6 having the same structure as the dispersion plate 5 are adopted, adjustment is made such that the slit members of the dispersion plate 5 and the additional dispersion plate 6 do not overlap when viewed from the vertical direction. Thereby, the breaking, mixing, or dispersion of the powder P is further promoted.

[0041] [Summary of the Embodiment]

[0042] In the powder supply device 2, the powder P accommodated inside the housing 40 is conveyed by the screw 41 to the discharge port 40b at the lower end of the housing 40. The powder P that has passed through the discharge port 40b passes through the plurality of openings of the dispersion plate 5 provided downstream of the discharge port 40b. The compacted powder included in the passed powder P is broken, mixed, or dispersed. Thus, the powder supply device 2 can supply the powder in a state with reduced density unevenness to the roll device 3.

[0043] As described above, various exemplary embodiments have been described, but the present invention is not limited to the above-described exemplary embodiments, and various omissions, substitutions, and changes can be made.

[0044] The dispersion plate 5 of the powder supply device 2 and the additional dispersion plate 6 may be arranged at intervals without being in close contact. The additional dispersion plate 6 is not limited to one, and a plurality of additional dispersion plates 6 may be used. The plurality of additional dispersion plates 6 may also be arranged at intervals. The powder supply device 2 may not include the additional dispersion plate 6. The powder supply device 2 may supply the powder to a device other than the roll device. The shape of the above-described slit or lattice-shaped opening can be appropriately set, and for example, it may be circular. For the lattice-shaped opening SL4 provided on the edge side of the dispersion plate 5E, it is sufficient that a part thereof is larger than the lattice-shaped opening SL3 provided in the center of the dispersion plate 5E.

[0045] [Summary of Embodiments of the Present Disclosure]

[0046] The present disclosure includes the following aspects.

[0047] (Item 1) A powder supply device according to one aspect of the present disclosure includes: a housing that defines a space for accommodating powder as a raw material inside and has a discharge port that opens downward at the lower end; a screw that is accommodated in the housing and has a rotation axis, and conveys the powder toward the discharge port by rotating about the rotation axis; and a dispersion plate that is provided downstream of the discharge port and has a plurality of openings.

[0048] In this powder supply device, the powder accommodated inside the housing is conveyed by the screw to the discharge port at the lower end of the housing. The powder that has passed through the discharge port passes through the plurality of openings of the dispersion plate provided downstream of the discharge port. The compacted powder included in the passed powder is broken, mixed, or dispersed. Thus, the powder supply device can supply the powder in a state with reduced density unevenness to the roll device.

[0049] (Item 2) Based on the powder supply device described in Item 1, the dispersion plate may also have: a through-port communicating with the discharge port; and a plurality of slit members provided at intervals in the through-port. The plurality of slit members are each plate members, and the plurality of openings are a plurality of slits formed between the plurality of slit members. At least one of the plurality of slit members is provided such that its main surface is inclined with respect to the conveying direction of the powder by the screw. The powder supply device allows the powder to pass through the plurality of slits, thereby reducing density unevenness. The inclined slit member becomes a resistance to the conveyed powder, increasing the effect of crushing, mixing, or dispersing. The powder supply device allows the powder to pass between the inclined slit members, thereby supplying the powder in a state with further reduced density unevenness to the roller device.

[0050] (Item 3) Based on the powder supply device described in Item 2, the plurality of slit members may be arranged. The at least one slit member is arranged at a position closer to the outer edge than the center of the dispersion plate in the arrangement direction and is inclined such that the lower end is closer to the outer edge than the upper end. Regarding the density of the powder inside the housing, the portion closer to the inner wall of the housing in the horizontal direction is lower than the portion closer to the center. This is because the inner wall of the housing becomes a resistance to the powder flow. Therefore, the density distribution of the powder reaching the discharge port and the through-port also has a tendency to be lower as it gets closer to the edge. The at least one slit member guides the powder toward the outer edge of the dispersion plate. Thereby, the density difference between the powder discharged from the portion closer to the edge of the dispersion plate and the powder discharged from the portion closer to the center is alleviated, and the density unevenness in the horizontal direction (width direction) of the through-port is further reduced.

[0051] (Item 4) Based on the powder supply device described in Item 1, the dispersion plate may also have: an outer frame forming a through-port communicating with the discharge port; an inner frame supported inside the outer frame; and a plurality of slit members provided at intervals on the inner side wall of the inner frame. The plurality of openings are a plurality of slits formed between the outer frame and the inner frame and between the plurality of slit members. The plurality of slit members are provided on the inner side wall of the inner frame, and the inner frame has an outer side wall that is inclined such that the lower end is closer to the outer frame than the upper end. The powder passing through the center of the through-port, that is, the inner frame, is crushed, mixed, or dispersed by the slits, and the powder between the inner frame and the outer frame is guided toward the outer edge of the dispersion plate along the inclined outer side wall of the inner frame as it approaches the lower end of the inner frame. Thereby, the density difference between the powder discharged from the portion closer to the edge of the dispersion plate and the powder discharged from the portion closer to the center is alleviated, and the density unevenness in the horizontal direction (width direction) of the through-port is reduced.

[0052] (Item 5) Based on the powder supply device described in Item 1, the dispersion plate may also have the above-mentioned plurality of lattice-shaped openings, and at least one of the plurality of openings provided at a position closer to the outer edge than the center of the dispersion plate is formed larger than the opening provided at a position closer to the center than the outer edge of the dispersion plate. The powder supply device allows the powder to pass through the plurality of lattice-shaped openings, thereby reducing density unevenness. The powder passes through an opening larger than the opening provided at a position closer to the center than the outer edge of the dispersion plate through an opening at a position closer to the outer edge than the center of the through-hole. As a result, the density difference between the powder discharged from the portion near the edge of the dispersion plate and the powder discharged from the portion near the center is alleviated, and the density unevenness in the horizontal direction (width direction) of the through-hole is reduced.

[0053] (Item 6) The powder supply device described in Items 1 to 5 may also further include: an additional dispersion plate having a plurality of openings and provided downstream of the dispersion plate, and the additional dispersion plate is arranged such that at least a part of the plurality of openings of the dispersion plate does not overlap with the plurality of openings of the additional dispersion plate when viewed from the vertical direction. The powder passes through the openings of the two dispersion plates, namely the dispersion plate and the additional dispersion plate. Since a part of the openings does not overlap, crushing, mixing, or dispersion is further promoted. As a result, the density unevenness of the powder is further reduced.

Claims

1. A powder supply device, characterized in that: have: The outer shell has a space for accommodating the powder as the raw material, and has a discharge port at the lower end thereof opening downward; a screw, housed in the housing, having a rotation axis, and conveying the powder toward the discharge port by rotating about the rotation axis; as well as The dispersion plate is disposed downstream of the discharge port and has a plurality of openings.

2. The powder supply device according to claim 1, characterized in that: The dispersion plate includes: a passage port communicating with the discharge port; and a plurality of slit members provided at intervals at the passage port. The plurality of slit members are respectively plate members, The plurality of openings are a plurality of slits formed between the plurality of slit members, At least one slit member included in the plurality of slit members is provided so that a main surface thereof is inclined with respect to a conveying direction of the powder by the screw.

3. The powder supply device according to claim 2, characterized in that: The plurality of slit components are arranged in an array, The at least one slit member is disposed at a position closer to the outer edge than the center of the dispersion plate in the arrangement direction, and is inclined such that a lower end is closer to the outer edge than an upper end.

4. The powder supply device according to claim 1, characterized in that: The dispersion plate comprises: an outer frame forming a through port communicating with the discharge port; an inner frame supported in the outer frame; and a plurality of slit members provided at intervals on an inner side wall of the inner frame. The plurality of openings are a plurality of slits formed between the outer frame and the inner frame and between the plurality of slit members. The inner frame has an outer side wall which is inclined such that a lower end of the outer side wall is closer to the outer frame than an upper end of the outer side wall.

5. The powder supply device according to claim 1, characterized in that: The dispersion plate has the plurality of openings in a grid shape, At least one of the plurality of openings disposed at a position closer to the outer edge than the center of the dispersion plate is formed larger than an opening disposed at a position closer to the center than the outer edge of the dispersion plate.

6. The powder supply device according to any one of claims 1 to 5, characterized in that: Also available: an additional dispersion plate having a plurality of openings disposed downstream of the dispersion plate, The additional dispersing plate is disposed so that the plurality of openings of the dispersing plate at least partially do not overlap with the plurality of openings of the additional dispersing plate when viewed from a vertical direction.

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