JP2016204131A - Powder supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce quantity of gas jetted into a hopper while sufficiently charging powder from the hopper to a powder supply part.SOLUTION: A powder supply device is provided that comprises a hopper having a gas jetting part for jetting gas to powder stored therein, and a supply part for supplying a predetermined amount of the powder charged from the hopper to a supply object. The supply part comprises a powder filling part to be filled with the predetermined amount of the powder, a periodic operation part operating periodically, and a casing for housing the periodic operation part. After filling the power filling part with the powder at an upper part of the casing, the powder is repeatedly discharged from the powder filling part to the supply object at a lower part of the casing. The hopper temporarily jets gas from the gas jetting part to the powder stored therein in synchronization with the operation of the periodic operation part from the time when the powder is filled in the power filling part until the next time when the power is filled in the powder filling part.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a powder supply apparatus.

  In recent years, a layered modeling apparatus that produces a three-dimensional layered object by irradiating a powder made of an inorganic material or an organic material with a laser beam and sintering or melting and solidifying has attracted attention. Specifically, a powder layer is formed on the stage to form a powder layer, and a predetermined layer of the powder layer is irradiated with a laser beam to sinter or melt and solidify to form a hardened layer. Repeat the process. Thus, a three-dimensional shaped object can be manufactured by stacking and integrating a large number of hardened layers.

  The additive manufacturing apparatus disclosed in Patent Document 1 includes a powder supply unit (FIG. 7 of Patent Document 1) for supplying powder stored in a large tank to a squeegee. Specifically, when the piston portion provided with the through hole is retracted, a predetermined amount of powder is filled in the through hole, and when the piston portion is advanced, the filled powder is discharged from the through hole to the squeegee. The A funnel-shaped hopper for temporarily storing powder supplied from a large tank is usually provided on the upper side of the powder supply unit as disclosed in Patent Document 1.

Japanese Patent Laid-Open No. 2015-020328

  When the powder stored in the hopper is discharged from the outlet of the hopper, a rat hole is formed in the powder accumulated in the hopper, and the powder is supplied to the powder supply unit provided below the hopper. Input may be insufficient. Such a rat hole can be eliminated by providing a gas injection nozzle in the hopper and injecting a gas such as an inert gas from the gas injection nozzle onto the deposited powder.

  Here, if gas is continuously injected to the powder accumulated in the hopper, sufficient powder can be stably injected into the powder supply unit, but the gas consumption increases and the economy is inferior. . On the other hand, if the gas is not continuously injected, the powder may not be sufficiently charged into the powder supply unit unless the gas is injected at an appropriate timing.

  The present invention has been made in view of the above, and provides a powder supply apparatus capable of reducing the amount of gas injected into the hopper while sufficiently supplying powder from the hopper to the powder supply unit. Is.

The powder supply apparatus according to the present invention comprises:
A hopper having a gas injection unit for injecting gas to the powder stored inside;
A powder supply apparatus comprising: a supply unit that supplies a predetermined amount of the powder charged from the hopper to a supply object;
The supply unit
A periodic operation unit having a powder filling unit for filling the predetermined amount of the powder, and periodically operating;
A housing for housing the periodic operation unit,
After filling the powder filling unit with the powder in the upper part of the casing, the operation of discharging the powder from the powder filling part to the supply object in the lower part of the casing is repeated,
Hopper
Between the time when the powder filling unit is filled with the powder and the time when the powder filling unit is filled with the powder, the powder filling unit is stored in synchronization with the operation of the periodic operation unit. Gas is temporarily injected from the gas injection unit to the powder.
It is preferable that the gas injection unit and the periodic operation unit are driven by the same drive source.
The drive source is preferably an air drive source using compressed air.

  In the powder supply apparatus according to the present invention, by the operation of the periodic operation unit in the supply unit, the filling of the powder into the powder filling unit provided in the periodic operation unit and the release of the powder from the powder filling unit repeat. The powder stored in the hopper is synchronized with the operation of the periodic operation unit between the time the powder filling unit is filled with the powder and the next time the powder filling unit is filled with the powder. Gas is temporarily injected from the gas injection unit to the body. For this reason, the powder can be sufficiently charged to the supply section after the powder filling section is filled with the powder and before the powder filling section is filled with the powder. Further, since the gas is temporarily injected instead of continuously injecting the gas into the hopper, the amount of gas can be reduced as compared with the case where the gas is continuously injected. That is, the amount of gas injected into the hopper can be reduced while the powder is sufficiently charged from the hopper to the supply unit.

Note that the gas injection unit and the periodic operation unit are preferably driven by the same drive source.
The drive source is preferably an air drive source using compressed air.

  According to the present invention, it is possible to reduce the amount of gas injected into the hopper while sufficiently supplying the powder from the hopper to the powder supply unit.

It is a typical sectional view showing an example of a layered modeling device to which a powder supply device concerning a 1st embodiment is applied. It is a typical sectional view of hopper 50 with which powder supply device 2 is provided. It is a typical sectional view of hopper 50 with which powder supply device 2 is provided. It is a typical sectional view of supply part 70 with which powder supply device 2 concerning a 1st embodiment is provided. It is a typical sectional view of supply part 70 with which powder supply device 2 concerning a 1st embodiment is provided. It is a typical sectional view of supply part 70 with which powder supply device 2 concerning a 1st embodiment is provided. It is a typical sectional view of supply part 70 with which powder supply device 2 concerning a 2nd embodiment is provided. It is a typical sectional view of supply part 70 with which powder supply device 2 concerning a 2nd embodiment is provided.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate.

(Second Embodiment)
First, an additive manufacturing apparatus to which the powder supply apparatus according to this embodiment is applied will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view illustrating an example of an additive manufacturing apparatus to which the powder supply apparatus according to the first embodiment is applied. As shown in FIG. 1, the additive manufacturing apparatus 1 includes a powder supply device 2, a base 11, a surface plate 12, a modeling tank 13, a modeling tank support unit 14, a modeling tank drive unit 15, a column 16, a support unit 17, and a laser. The scanner 18, the optical fiber 19, the laser oscillator 20, the squeegee 31, the decompression device 39, and the powder storage unit 40 are provided.
Here, the powder supply apparatus 2 according to the present embodiment includes a hopper 50 and a supply unit 70.

  Note that the right-handed xyz coordinates shown in FIG. 1 and other drawings are convenient for explaining the positional relationship of the components, but correspond to each other in the drawings. Usually, the xy plane constitutes a horizontal plane, and the z-axis plus direction is vertically upward.

The base 11 is a table for fixing the surface plate 12 and the column 16. The base 11 is installed on the floor so that the upper surface on which the surface plate 12 is placed is horizontal.
The surface plate 12 is placed and fixed on the horizontal upper surface of the base 11. The upper surface of the surface plate 12 is also horizontal, and powder is spread on the upper surface (stage) of the surface plate 12 to form a three-dimensional structure 27. In the example of FIG. 1, the surface plate 12 is a quadrangular columnar member. As shown in FIG. 1, a flange-like convex portion 12 a that protrudes in the horizontal direction is formed on the entire periphery of the upper surface of the surface plate 12. Since the outer peripheral surface of the convex portion 12 a is in contact with the inner surface of the modeling tank 13 throughout, the laminated powder layer 26 is placed in a space surrounded by the upper surface of the surface plate 12 and the inner surface of the modeling tank 13. Can be held. In the present embodiment, the powder is a metal material such as iron powder.

  The modeling tank 13 is a cylindrical member that holds the powder spread on the upper surface of the surface plate 12 from the side surface. A powder layer 26 is formed on a modeling portion 25 that is an upper opening end of the modeling tank 13, and a laser beam 22 is irradiated on the powder layer 26 to form a hardened layer. The modeling tank 13 is installed so as to be movable in the vertical direction (vertical direction, that is, the z-axis direction). That is, each time the hardened layer is formed, the modeling tank 13 is raised by a certain amount with respect to the surface plate 12 to form the three-dimensional modeled object 27.

  The modeling tank support part 14 is a support member that supports the lower surface of the flange part 13a so that the upper surface of the flange part 13a of the modeling tank 13 is horizontal. The modeling tank support part 14 is connected to a connecting part 15c of a modeling tank drive unit 15 that moves the modeling tank 13 in the vertical direction.

  The modeling tank drive unit 15 is a drive mechanism for moving the modeling tank 13 in the vertical direction. The modeling tank drive unit 15 is fixed to a support column 16 erected in the vertical direction from the base 11. The modeling tank drive unit 15 includes a motor 15a, a ball screw 15b, and a connecting portion 15c. When the motor 15a is driven, the ball screw 15b extending in the vertical direction rotates. When the ball screw 15b rotates, the connecting portion 15c moves in the vertical direction along the ball screw 15b. Thereby, the modeling tank 13 moves up and down.

  The laser scanner 18 irradiates a laser beam 22 on a powder layer 26 formed on a modeling portion 25 that is an upper opening end of the modeling tank 13. The laser scanner 18 includes a lens and a mirror (not shown), and can scan the laser beam 22 on a horizontal plane. That is, it is possible to selectively heat and solidify powder at an arbitrary location on a horizontal plane. The laser beam 22 is generated in the laser oscillator 20 and introduced into the laser scanner 18 through the optical fiber 19. The laser scanner 18 is fixed to the support portion 17.

  The squeegee 31 is composed of two plate-like members extending in the y-axis direction. Further, the squeegee 31 can slide in the x-axis direction from the one flange portion 13a to the opposing flange portion 13a through the modeling portion 25 that is the upper opening end of the modeling tank 13. A predetermined amount of powder is supplied from the supply unit 70 into the gap between the two squeegees 31 made of plate-like members. That is, the squeegee 31 holds a predetermined amount of powder in the gap between the two plate-like members, and then moves in the x-axis direction to form the powder layer 26 in the modeling portion 25.

  Specifically, when forming the three-dimensional structure 27, the modeling tank drive unit 15 first moves the modeling tank 13 upward. Thereby, a step is formed between the upper surface of the powder layer 26 and the upper surface of the flange portion 13 a of the modeling tank 13. As shown in FIG. 1, a predetermined amount of powder is supplied from the supply unit 70 to the gap of the squeegee 31 in a state where the squeegee 31 is installed on the flange 13 a on the x-axis minus side. Thereafter, the squeegee 31 slides in the x-axis plus direction from the x-axis minus side flange portion 13a to the x-axis plus side flange portion 13a, whereby a new powder layer 26 is formed at the step. Here, the upper surface of the new powder layer 26 and the upper surface of the flange portion 13a are flush with each other, eliminating the level difference. Thereafter, a predetermined region of the new powder layer 26 is irradiated with the laser beam 22 to selectively solidify the powder layer 26.

  Thus, after moving the modeling tank 13 upward, a step of forming a new powder layer 26 using the squeegee 31 and a new powder layer 26 are selectively solidified using the laser beam 22. By repeating the process, the three-dimensional structure 27 can be formed.

The powder storage unit 40 is a large tank that stores powder. The powder storage unit 40 is preferably installed on the floor surface.
The hopper 50 is a funnel-shaped container that temporarily stores powder to be supplied to the supply unit 70, and is provided on the upper side of the supply unit 70. Powder is supplied from the hopper 50 to the supply unit 70 via the pipe 35.
Here, powder for forming a three-dimensional structure is stored in the powder storage unit 40, and the capacity of the powder storage unit 40 is sufficiently larger than the capacity of the hopper 50.

  The powder is conveyed from the powder storage unit 40 to the hopper 50 through the pipe 41. Here, the powder is sucked from the powder storage unit 40 by the suction unit 37 and conveyed to the hopper 50. Specifically, as shown in FIG. 1, a decompression device 39 is connected to the suction portion 37 via a pipe 38. Therefore, the pressure stored in the powder storage unit 40 is sucked to the suction unit 37 side by decompressing the suction unit 37 using the decompression device 39. The sucked powder is supplied to the hopper 50. When a certain amount of powder is conveyed to the hopper 50 (that is, when the capacity of the hopper 50 is full), the decompression device 39 is stopped and the conveyance of the powder from the powder storage unit 40 to the hopper 50 is stopped. To do.

  Next, with reference to FIG. 2, the hopper 50 with which the powder supply apparatus 2 which concerns on 1st Embodiment is provided is demonstrated in detail. FIG. 2 is a schematic cross-sectional view of a hopper 50 provided in the powder supply device 2. As shown in FIG. 2, the hopper 50 temporarily stores the powder 45 supplied from the powder storage unit 40 and discharges the powder 45 from a discharge port 58 provided on the lower side. At the bottom of the hopper 50, a lateral nozzle 51 for injecting gas in the lateral direction (horizontal direction) and an upward nozzle 52 for injecting gas in the upward direction (vertical direction) are provided as gas injection units. . Gas is supplied to the horizontal nozzle 51 and the upward nozzle 52 from a pipe 53. As the gas, for example, an inert gas such as argon gas or nitrogen gas is preferably used in order to prevent oxidation of the powder.

  A valve 55 is provided between the lateral nozzle 51 and the upward nozzle 52 and the pipe 53. When gas is injected from the lateral nozzle 51 by controlling the opening and closing of the valve 55, the upward nozzle 52. Can be switched between the case where the gas is injected from the nozzle and the case where the gas is injected from the horizontal nozzle 51 and the upward nozzle 52.

As will be described in detail later, the opening and closing of the valve 55 is driven by the drive source 80 in synchronization with the drive timing of the roll 72 of the supply unit 70. That is, gas is injected in the hopper 50 in synchronization with the drive timing of the roll 72.
Here, when the valve 55 and the roll 72 are driven by separate drive sources, a device for synchronizing the drive timings of both is required. Therefore, as shown in FIG. 2, the valve 55 and the roll 72 of the hopper 50 are preferably driven by the same drive source 80. The drive source 80 is preferably an air drive source using compressed air. The timing of gas injection in the hopper 50 can be synchronized with the driving timing of the roll 72 with a simple configuration.

FIG. 2 shows a case where the lateral nozzle 51 is parallel to the horizontal direction (x-axis direction in the example in the figure), and the upper nozzle 52 is parallel to the vertical direction (z-axis direction in the example in the figure). Yes. However, in the present embodiment, the lateral nozzle 51 may have a certain angle with respect to the horizontal direction, and the upward nozzle 52 may have a certain angle with respect to the vertical direction.
Further, the hopper 50 may include only one of the horizontal nozzle 51 and the upward nozzle 52.

  Here, FIG. 3 is a schematic cross-sectional view of the hopper 50 provided in the powder supply device 2 and shows a state in which the rat hole 60 is formed in the powder 45. As shown in FIG. 3, when the powder 45 stored in the hopper 50 is discharged from the discharge port 58 of the hopper 50, the powder 45 is deposited along the inner wall of the hopper 50. As a result, the rat hole 60 may be formed. In general, the rat hole 60 is formed so as to extend in the vertical direction (z-axis direction) from the discharge port 58. When the rat hole 60 is formed, the powder 45 is not discharged from the discharge port 58 even though the powder 45 is stored in the hopper 50. That is, the powder 45 is not charged into the supply unit 70.

  The powder supply apparatus 2 according to the embodiment includes a lateral nozzle 51 and an upward nozzle 52 at the bottom of the hopper 50. By injecting gas from the lateral nozzle 51 and the upward nozzle 52 onto the deposited powder 45, the deposited powder 45 can be crushed and the rat hole 60 can be eliminated. As a result, sufficient powder 45 can be charged into the supply unit 70.

  When gas is jetted in the lateral direction from the lateral nozzle 51, the powder 45 deposited in the vicinity of the discharge port 58 can be crushed. When gas is jetted upward from the upward nozzle 52, the powder 45 deposited near the inner wall of the hopper 50 can be crushed. The crushed powder 45 is discharged from the discharge port 58 and supplied to the supply unit 70. Here, it is preferable to inject gas in the upward direction from the upward nozzle 52 after injecting gas in the lateral direction from the lateral nozzle 51 and reducing the amount of the accumulated powder 45. It is possible to reduce the amount of the powder 45 that is deposited again when falling after being blown upward by the upward gas injection.

  Further, the flow rate of the gas ejected from the upper nozzle 52 may be smaller than the flow rate of the gas ejected from the lateral nozzle 51. By doing in this way, when the gas is jetted upward, the amount of powder blown upward can be reduced. For example, the flow rate of the gas injected from the lateral nozzle 51 and the upward nozzle 52 can be controlled using the valve 55.

Next, with reference to FIGS. 4-6, the supply part 70 with which the powder supply apparatus 2 which concerns on 1st Embodiment is provided is demonstrated in detail. 4-6 is typical sectional drawing of the supply part 70 with which the powder supply apparatus 2 which concerns on 1st Embodiment is provided.
As shown in FIGS. 4 to 6, the supply unit 70 includes a housing 71, a roll 72, and a lid 73.

  The casing 71 accommodates a roll (periodic operation unit) 72 in a rotatable manner. In the upper part of the casing 71 (that is, on the upper side of the roll 72), an introduction port 71a for introducing the powder 45 introduced from the hopper 50 is provided. Further, a lid 73 is provided on the upper surface of the casing 71, that is, on the upper side of the introduction port 71a. Therefore, the powder 45 introduced from the introduction port 71 a is structured not to overflow from the upper part of the casing 71. At the lower part of the casing 71 (that is, below the roll 72), a dropping port 71b for supplying the powder 45 to the squeegee 31 that is a supply target is provided. The introduction port 71a and the drop port 71b are both wide on the upper side and narrow on the lower side.

The roll 72 is a columnar member that extends in the y-axis direction and has an axis parallel to the y-axis. On the surface of the roll 72, a concave groove (powder filling portion) 72a for filling the powder 45 is extended in the axial direction (y-axis direction). The roll 72 is rotationally driven by a drive source 80 common to the valve 55 of the hopper 50. As described above, gas is injected in the hopper 50 in synchronization with the drive timing of the roll 72.
In addition, the recessed groove 72a provided in the roll 72 may be provided in two or more places.

As shown in FIG. 4, when the concave groove 72a of the roll 72 is positioned on the upper side (the z-axis direction plus side), the powder 45 introduced from the hopper 50 through the pipe 35 is filled into the concave groove 72a.
As shown in FIG. 5, when the roll 72 is rotated, a predetermined amount of the powder 45 filled in the groove 72a is rotationally moved (clockwise in the example in the figure).
Then, as shown in FIG. 6, when the groove 72a of the roll 72 is positioned on the lower side (minus side in the z-axis direction), a predetermined amount of powder 45 filled in the groove 72a falls. The powder 45 is supplied to the squeegee 31 that is the supply object through the drop opening 71 b of the housing 71.

  As described above, in the powder supply device 2 according to the present embodiment, the roll 72 in the supply unit 70 periodically operates (that is, rotates) to fill the concave groove 72a with the powder 45, and then the concave groove. The operation of releasing the powder 45 from 72a is repeated. Here, in the powder supply apparatus 2 according to the present embodiment, after filling the groove 45a with the powder 45 and before filling with the powder 45 (in the example shown in the figure, the roll 72 is rotated once). In synchronism with the rotation of the roll 72, the hopper 50 injects gas for a predetermined period, that is, temporarily. Therefore, the powder 45 can be sufficiently charged from the hopper 50 to the supply unit 70 after the groove 45 a is filled with the powder 45 and before the next filling of the powder 45. In the illustrated example, since the gas is injected in the hopper 50 between FIG. 4 and FIG. 5, the amount of the powder 45 introduced into the supply unit 70 from the hopper 50 in FIG. 5 increases.

Moreover, in the powder supply apparatus 2 according to the present embodiment, gas is not continuously injected into the hopper 50, but temporarily (periodically or intermittently) in synchronization with the operation of the roll 72 as described above. The amount of gas can be reduced compared to the case where gas is continuously injected.
That is, in the powder supply apparatus 2 according to the present embodiment, the amount of gas injected into the hopper 50 can be reduced while the powder 45 is sufficiently charged from the hopper 50 to the supply unit 70.

(Second Embodiment)
Next, with reference to FIG. 7, FIG. 8, the supply part 70 with which the powder supply apparatus 2 which concerns on 2nd Embodiment is provided is demonstrated in detail. 7 and 8 are schematic cross-sectional views of the supply unit 70 provided in the powder supply apparatus 2 according to the second embodiment. While the periodic operation unit of the supply unit 70 according to the first embodiment is a rotary type, the periodic operation unit of the supply unit 70 according to the present embodiment is a reciprocating type.
As shown in FIGS. 7 and 8, the supply unit 70 according to the present embodiment includes a housing 71 and a piston 74.

  Similar to the supply unit 70 according to the first embodiment, an introduction port 71a for introducing the powder 45 introduced from the hopper 50 is provided in the upper portion of the casing 71 (that is, above the piston 74). Yes. At the lower part of the casing 71 (that is, below the piston 74), a dropping port 71b for supplying the powder 45 to the squeegee 31 that is a supply object is provided. The casing 71 according to the present embodiment is provided with a cylinder portion 71c that slidably accommodates the piston 74.

The piston (periodic operation part) 74 includes a through hole (powder filling part) 74a. The piston 74 is connected to the drive source 80 via a rod 74b.
As shown in FIG. 7, when the empty through hole 74a is positioned below the introduction port 71a, a predetermined amount of powder 45 is filled in the through hole 74a.
As shown in FIG. 8, when the piston 74 is pushed into the cylinder portion 71c and the through hole 74a is positioned above the drop opening 71b, a predetermined amount of powder 45 filled in the through hole 74a falls. . The powder 45 is supplied to the squeegee 31 that is the supply object through the drop opening 71 b of the housing 71.

  Thus, in the powder supply apparatus 2 according to the present embodiment, the piston 74 in the supply unit 70 periodically operates (that is, reciprocates) to fill the through-hole 74a with the powder 45, and then the through-hole. The operation of releasing the powder 45 from 74a is repeated. Here, in the powder supply apparatus 2 according to the present embodiment, after the through-hole 74a is filled with the powder 45 and before the next powder 45 is filled (in the example shown in the figure, the piston 74 makes one reciprocation). In synchronism with the reciprocation of the piston 74, the hopper 50 injects gas for a predetermined period, that is, temporarily. Therefore, the powder 45 can be sufficiently charged from the hopper 50 to the supply unit 70 after the through-hole 74a is filled with the powder 45 and before the next filling of the powder 45. In the illustrated example, since the gas is injected in the hopper 50 between FIG. 7 and FIG. 8, the amount of the powder 45 introduced into the supply unit 70 from the hopper 50 in FIG. 8 is increased.

Further, in the powder supply device 2 according to the present embodiment, gas is not continuously injected into the hopper 50, but temporarily (periodically or intermittently) in synchronization with the reciprocating operation of the piston 74 as described above. Since the gas is injected, the amount of gas can be reduced as compared with the case where the gas is continuously injected.
That is, also in the powder supply apparatus 2 according to the present embodiment, the amount of gas injected into the hopper 50 can be reduced while the powder 45 is sufficiently charged from the hopper 50 to the supply unit 70.

In addition, this invention is not limited to the said embodiment, It is possible to change suitably in the range which does not deviate from the meaning.
For example, the valve may be fixed with a certain amount of opening, and air may be directly supplied to the pipe 53 from the air drive source.

DESCRIPTION OF SYMBOLS 1 Layered modeling apparatus 2 Powder supply apparatus 11 Base 12 Surface plate 12a Convex part 13 Modeling tank 13a Flange part 14 Modeling tank support part 15 Modeling tank drive part 15a Motor 15b Ball screw 15c Connection part 16 Support | pillar 17 Support part 18 Laser scanner 19 Optical fiber 20 Laser oscillator 22 Laser beam 25 Modeling unit 26 Powder layer 27 Three-dimensional model 31 Squeegee 35, 38, 41, 53 Pipe 37 Suction unit 39 Decompression unit 40 Powder storage unit 45 Powder 50 Hopper 51 Horizontal nozzle 52 Upward nozzle 55 Valve 58 Discharge port 60 Rat hole 70 Supply part 71 Housing 71a Introduction port 71b Drop port 71c Cylinder part 72 Roll 72a Groove 73 Cover part 74 Piston 74a Through hole 74b Rod 80 Drive source

Claims (1)

A hopper having a gas injection unit for injecting gas to the powder stored inside;
A powder supply apparatus comprising: a supply unit that supplies a predetermined amount of the powder charged from the hopper to a supply object;
The supply unit
A periodic operation unit having a powder filling unit for filling the predetermined amount of the powder, and periodically operating;
A housing for housing the periodic operation unit,
After filling the powder filling unit with the powder in the upper part of the casing, the operation of discharging the powder from the powder filling part to the supply object in the lower part of the casing is repeated,
Hopper
Between the time when the powder filling unit is filled with the powder and the time when the powder filling unit is filled with the powder, the powder filling unit is stored in synchronization with the operation of the periodic operation unit. Temporarily injecting gas from the gas injection unit to the powder;
Powder supply device.

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