JPH0729685B2 - Powder feeder - Google Patents

Description

TECHNICAL FIELD The present invention relates to powders of plastics, ceramics, metals, etc.
The present invention relates to a powder supply device for supplying a constant and continuous flow rate per minute, for example, one hundredth of a second. This powder supply device is a device that is always used in the industry that handles powdery substances (including granular and granular substances). It covers a wide range, even minute quantities on the order of 0.1 grams per minute.

The powder supply device of the present invention is used in the field of handling a powdery substance on the order of several kg per minute, the field of handling a minute amount on the order of 0.1 g per minute, and the intermediate field. Is.

2. Description of the Related Art As a powder supply device as described above, it has been considered to use a conventional vibrating component feeder as it is, but the vibrating component feeder is generally called a parts feeder. As shown in FIG. 9, its main body is roughly divided into a movable part and a fixed part in terms of structure, and the movable part is a bowl.
It is composed of a movable base 51 and a movable core 52 on which 50 is mounted.

In the spiral parts feeder, as shown in FIG. 10, a spiral track 53 is formed inside the bowl. The fixed portion is composed of an electromagnetic coil 54 that periodically generates an attracting magnet by an AC power source, a fixed core 55, and a fixed base 56. The movable part and the fixed part are connected by a leaf spring 57, and the fixed part 56 is completely fixed to a sufficiently large rigid base, or the fixed part 56 is made of a rubber foot or the like because of its ease of handling and vibration isolation. It is installed on the pedestal 59 using the swing material 58.

By passing an alternating current through the electromagnetic coil 54, the fixed core
A suction force is periodically generated between the 55 and the movable core 52, and the plate spring 57 is interposed, whereby the bowl 50 vibrates in the vertical direction and the circumferential direction, and is formed in a spiral shape inside the bowl. The parts on the track 53 move in a spiral shape from the lower part to the upper part under the transfer force.

When powder is placed in the bowl of this spiral type parts feeder instead of the above parts and voltage is applied to the electromagnetic coil, the powder receives the transfer force due to vibration in the same way as the parts receive the transfer force described above. , It moves spirally on the track from the lower part to the upper part, and is discharged to the outside of the bowl from the track end of the bowl upper part.

Therefore, by taking measures to guide the discharged powder to the next process, the spiral parts feeder can be used as a vibrating powder feeder, but since it was originally used as a parts feeder. However, some problems occur when it is used as a powder feeder.

Problems to be Solved by the Invention A first problem that occurs when a parts feeder is used as a powder supply device is that if the powder amount in the bowl changes, the powder supply amount also changes, and quantitativeness is maintained. That is not the case.
In other words, when the amount of powder in the bowl is large, the vibrated bowl becomes heavier, so the swing of the bowl is small, and as a result,
When the powder transfer force becomes weak and the amount of powder in the bowl is small, the swing of the bowl is large and the powder transfer force becomes strong.

In other words, if you put powder in the bowl, vibrate the bowl to transfer the powder, and continue to discharge the powder from the outlet at the top of the bowl, the amount of powder in the bowl will decrease with the passage of time. The shaken bowl becomes lighter, and the amount of powder discharged from the bowl, that is, the amount of powder supply, increases with the passage of time.

This phenomenon is a very big problem from the viewpoint of quantitative supply of powder.

Further, in the spiral type parts feeder, the feed amount of powder is adjusted by adjusting the voltage applied to the electromagnetic coil.

That is, when the voltage is increased, the feed amount increases, and when the voltage is decreased, the feed amount decreases. When the voltage is high, if the vibration of the bowl and the flow of powder on the track are stable and the amount of powder in the bowl is constant, the quantitativeness can be maintained.

On the other hand, when the voltage is lowered and the feed amount of the powder is reduced, a phenomenon that the flow of the powder on the track becomes unstable occurs, and it becomes difficult to secure the quantitative property. That is, the second problem is that the conventional spiral parts feeder cannot stably supply the powder in small amounts.

The present invention has been made in view of the above problems, and powders (including granules and granules) are produced by using a spiral type part feeder.
An object of the present invention is to provide a powder supply device capable of accurately supplying the powder to the next step at a constant speed.

Means for Solving the Problems In the present invention, in order to transfer powder by vibration, a bowl having a spiral track inside is provided, and the bowl is provided at the upper part of the bowl and the powder is stored in the lower part. A hopper having a body discharge port, a means for holding each of them independently to prevent vibration of the bowl from being transmitted to the hopper, and a hopper formed between the bottom surface inside the bowl and the powder discharge port of the hopper. A gap for allowing the powder to flow into the bowl, a vibration-proof film that connects the upper surface of the bowl and the outer surface of the hopper with airtightness, and a top surface of the hopper with airtightness. A cover for covering, a means for connecting the upper part inside the bowl and the upper part inside the hopper so as to have the same pressure, an inlet for supplying a carrier gas to the upper part inside the bowl, a carrier gas, and powder. Discharge from the bowl to the outside A powder supply device characterized by comprising:
And a bowl having a spiral track formed therein for transferring the powder by vibration, a hopper provided at the upper part of the bowl and having a powder discharge port at the lower part for storing the powder, and the bowl. Is formed between the bottom surface inside the bowl and the powder discharge port of the hopper, in order to prevent the vibration of the hopper from being transmitted to the hopper,
A gap for allowing the powder to flow into the bowl, a vibration-proof film that connects the upper surface of the bowl and the outer surface of the hopper with airtightness, and a lid that covers the upper surface of the hopper with airtightness A means for connecting the upper part inside the bowl and the upper part inside the hopper so as to have the same pressure, an inlet for supplying a carrier gas to the upper part inside the bowl, and a carrier gas and powder in the bowl. A discharge port for discharging further to the outside, and a vibration-damping material composed of three or more leaf springs radially arranged with respect to the center axis of the main body, between the bottom of the main body and the gantry. The above-mentioned object is to be achieved by a powder supplying device.

As the powder is discharged from the inside of the bowl due to the operation vibration, the level of the powder at the bottom of the bowl decreases, and the powder easily comes out from the powder discharge port at the bottom of the hopper through the gap. The amount of powder coming out of the bowl from the powder outlet is
If the amount of powder discharged from the inside of the bowl becomes larger,
The powder level at the bottom of the bowl becomes high, and it becomes difficult for powder to come out into the bowl through the gap, so the amount of powder supplied to the bowl and the amount of powder discharged to the outside from the bowl become equal. As a result, the amount of powder in the bowl is balanced and constant.

Further, since the bowl and the hopper are not directly connected, the swing of the bowl is not reduced by the weight of the hopper.

Therefore, the supply amount does not change due to the change in the hopper weight.

By connecting the upper surface of the bowl and the outer surface of the hopper with a vibration-proof film so as to provide airtightness, the bowl swing width is not diminished, that is, the powder supply capacity is not impaired. Confidentiality between the bowl and hopper held in the.

Further, the inside of the bowl and the inside of the hopper are kept confidential by covering the upper surface of the hopper with a lid so as to have airtightness.

On the other hand, as the powder is supplied, it is said that the volume of the hopper upper space increases due to the decrease of the powder amount in the hopper and the pressure in the hopper upper space becomes lower than the pressure inside the bowl due to the confidentiality of the powder amount in the hopper. A phenomenon occurs.

When the pressure in the space above the hopper becomes lower than the pressure in the bowl, a force due to the pressure difference acts on the powder inside the hopper from the bowl toward the inside of the hopper, so the powder is discharged from the powder discharge port at the bottom of the hopper. There is a problem that it will not be discharged smoothly.

Therefore, by connecting the upper part inside the bowl and the upper part inside the hopper so that they have almost the same pressure, this obstacle is not generated.

The powder carrier gas is supplied into the bowl from the inlet through a hose, etc. The powder is stably supplied to the next process along with the carrier gas from the discharge port by the vibration of the bowl through the hose.

Vibration-proof rubber and vibration-proof coil springs are generally used as vibration-proof materials for parts feeders, but when used as a powder feeder, if these spring constants are large, the powder feed capacity will be extremely high. The phenomenon occurs that it is lowered to 0.

Therefore, in the case of using the anti-vibration rubber or the anti-vibration coil spring as the powder vibrating material of the powder feeding apparatus having high powder feeding ability, it is necessary to reduce the spring constant.

On the other hand, when the pressure of the carrier gas is high, the bowl is connected to the hopper by the vibration isolator, so the gas pressure in the bowl presses it downward, compressing the vibration isolator with a small spring constant, As a result, the gap between the inner bottom surface of the bowl and the powder discharge port at the bottom of the hopper expands, which becomes a major obstacle to the fixed amount supply, and at the same time, the supply of carrier gas is stopped or reduced, and the gas in the bowl is stopped. When the pressure is reduced, the expanded gap is narrowed and the powder in the vicinity of the powder discharge port is compressed, which is a major cause of clogging.

The present inventor employs a leaf spring as a vibration isolator, and arranges three or more sheets so as to be substantially radial with respect to the central axis of the powder feeding apparatus, so that the direction along the central axis of the powder feeding apparatus can be improved. Although the spring constant is large, it has been found by experiments that the powder supply capacity is increased by decreasing the spring constant in the circumferential direction, and it has been confirmed by applying it to an actual device.

By installing the leaf spring as a vibration isolator in this way, even if the pressure of the carrier gas is increased, the gap is kept constant without impairing the powder supply capacity, and the powder is stably supplied.

Example Hereinafter, a first example of the present invention will be described with reference to FIG.

The hopper 35 is arranged above the bowl 36, and the hopper 35 is passed through the hopper support 6 to a mount (not shown) so that the gap 4 between the powder discharge port 3 and the bottom surface inside the bowl 36 is kept constant. The bowls 36 are attached to the pedestals through vibration-proof rubber attached to the bottom surface of the parts feeder body.

The internal structure of the parts feeder main body is shown in Figs.
It is the same as shown in the figure.

Keep the space between the bowl 36 and the hopper 35 confidential, and
The film 30 that is airtight and also has a vibration-proof property to prevent the vibration of the hopper 35 from being transmitted to the hopper 35.
It is stretched between 35 sides.

In this embodiment, a rubber film having a thickness of 1 mm is used,
The vibration of the bowl 36 is hardly transmitted to the hopper 35, and the confidentiality is sufficiently maintained.

A lid 33 is provided on the upper surface of the hopper 35. The bowl 36 is provided with a carrier gas inlet 31 and a powder and carrier gas outlet 32.

It is desirable that the position of the inlet 31 in the bowl 36 is provided near the upper portion of the bowl 36 so that the carrier gas on the track or on the bottom surface of the bowl into which the powder is introduced is not blown off. or,
The bowl 36 and the hopper 35 are connected by a connecting pipe 37 so that no pressure difference is generated between the space above the hopper 35 and the space above the bowl 36. In order to prevent the vibration of the bowl 36 from being transmitted to the hopper 35, it is desirable that the connecting pipe 37 has a vibration-proof property, and a vinyl tube is used in this embodiment.

The powder is filled in the hopper 35, and is supplied into the bowl 36 through the gap 4 as the bowl 36 vibrates in the direction of arrow A1. The powder is vibrated by the spiral track 10
The upper part is transferred from the lower part to the upper part, and is discharged to the outside of the bowl 36 through the discharge port 32 provided near the upper end of the track.
The carrier gas introduced into the bowl 36 through the inlet 31 is
Since the bowl 36 and the hopper 35 are airtight, they are discharged from the inside of the bowl 36 through only the discharge port 32.

Therefore, the powder and the carrier gas are discharged from the discharge port 32 and are supplied to the next step by a powder supply hose connected to the discharge port 32.

In this embodiment, the pressure inside the bowl 36 can be positive or negative.

The amount of powder supplied from the gap 4 into the bowl 36 is
36 If the amount of powder on the bottom is large, it will be difficult to produce and decrease, but on the contrary, if the amount of powder is small, it will be easy to produce and increase, so the amount of powder on the bottom of the bowl 36 will be almost constant,
The amount of powder per minute discharged from the discharge port 32 and the amount of powder per minute supplied from the hopper 35 through the gap 4 are in equilibrium, and the amount of powder inside the bowl 36 becomes constant. Therefore, fixed quantity supply is secured.

On the other hand, even if the outer diameter of the bowl 36 is increased to increase the size of the powder supply device and the inner volume of the hopper is increased, basically no problem occurs. Therefore, it is desirable to take a wide range, for example, those having a high specific gravity such as metal powder are, for example, those having a low specific gravity such as resin powder,
At the same level of supply, it is desirable to narrow it.

FIG. 2 and FIG. 3 show the second embodiment, in which the inside of the bowl and the hopper are made airtight and the powder is fed by the carrier gas, the powder supply using the leaf spring as the vibration isolator. A side view of an embodiment of the device is shown in FIG. 2 and a sectional view of the leaf spring arrangement is shown in FIG. The bowl 36 and the hopper 35 are also used in this embodiment.
A rubber film with a thickness of 1 mm is stretched between, and a lid is attached to the upper surface of the hopper 35 via a packing 34, a bowl 36,
The inside of the hopper 35 is made confidential.

On the bottom surface of the parts feeder main body 41, four vibration-proof leaf springs 40 are arranged substantially radially with respect to the central axis of the parts feeder main body 41.
Of the vibration-proof leaf spring 40 is attached to the pedestal 7.

The anti-vibration spring 40 stably mounts the parts feeder main body 41 on the stand 7.
It is desirable to mount the parts feeder closer to the outer circumference than to the central axis of the parts feeder body 41.

The leaf spring used as the vibration-proof leaf spring 40 is made of steel and has a width of 30.
mm, height 80 mm, thickness 0.8 mm. The leaf spring does not necessarily have to be made of steel, and for example, FRP may be used.

In this embodiment, four leaf springs are used as the vibration-proof leaf springs 40. However, even if three leaf springs are attached near the outer periphery of the bottom surface of the part feeder body 41 so as to be substantially radial, When it is stably attached to the stand, the powder pair is also stably supplied. Of course, the same effect can be obtained by using four or more leaf springs.

FIG. 4 shows a third embodiment, and is a cross-sectional view showing an embodiment in which a powder stirring rod 12 and a base 13 are installed inside the hopper 2. However, the motor 15 and part of the motor fixing base 16 are shown in a side view. The stirring rod 12 is fixed to the shaft of the motor 15 and rotates in the hopper 2 as the motor rotates to stir the powder to prevent clogging of the powder generated inside the hopper and formation of rat holes. I'm out. The umbrella 13 is fixed near the central axis of the hopper 2 by a umbrella support rod 14. The shape of the umbrella is almost conical, and the top is fixed so that it is on the upper side.

The umbrella 13 has a temporary turbulence in the flow of the powder caused by the rotation of the stirring rod 12, for example, a turbulence in the powder layer when the ratholes that have been formed are eliminated by stirring. It prevents it from reaching the exit 3 directly.

In this embodiment, the stirring rod has a diameter of 3 mm and is stirring inside the hopper at a speed of 1 rotation per minute. The umbrella 13 also has the function of preventing the weight of the powder in the hopper from being directly applied to the bowl 1. In this embodiment, the diameter of the umbrella 13 is close to the inner diameter of the powder discharge port 3, but the diameter is the fluidity of the powder,
In consideration of specific gravity and the like, it is desirable to set the inner diameter of the discharge port 3 to 0.5 to 2 times.

If the apex angle of the umbrella is too narrow, fluctuations in the powder flow above the umbrella and fluctuations in the powder level are easily transmitted to the powder outlet, and if it is too wide, it causes powder clogging. 45 degrees ~ 15
It is desirable to take it during zero movements.

In addition, it is not necessary to form the umbrella in a precise cone, and the above-mentioned effect can be produced if it is in a substantially cone shape.

FIGS. 5, 6, and 7 show a fourth embodiment, in which the powder feeding device having the same structure as that of FIG. It is sectional drawing of a cutting board.

In the embodiment shown in FIG. 5, the opening 21 of the baffle plate 20 has a height of 2 mm and a width of 5 mm.
Although the thickness of the baffle plate is 3 mm, which is not shown in the figure, the baffle plate is attached to the bowl with a screw so that no gap is formed between the baffle plate and the track 10.

Most of the powder transferred from the bottom of the bowl 1 onto the track 10 is cut by the baffle plate 20, a part of the powder passes through the opening 21, and the powder outlet 5 goes to the next process. Supplied with.

In this embodiment, one baffle plate 20 simultaneously cuts the upper surface and the side surface of the powder layer transferred on the track 10.
Simultaneous cutting is not always an essential means. For example, two baffles are used, and the upper surface of the powder layer to be transferred is first cut with one baffle, and then the side is cut into two.
You may cut with a separate baffle.

When the powder is easily attached, it is desirable that the baffle plate is made of a material such as a fluororesin or a silicone resin, which does not easily adhere to the powder.

In addition, when there are many kinds of powder to be handled and the set amount of the supply amount changes frequently, it is desirable that the width of the opening 21 of the baffle plate 20 can be adjusted.

FIG. 8 is a cross-sectional view of the bowl and the baffle plate in the fifth embodiment, which is the same as that of the first embodiment and has two baffle plates mounted in the bowl. . Here, the opening 23 of the baffle plate 25 provided on the upstream side of the flow of the powder transferred on the track has a height of 3 mm and a width of 6 mm, and the opening of the baffle plate 26 provided on the downstream side. The part 24 has a height of 1.5 mm and a width of 3 mm.

In this embodiment, two baffles are used, but depending on the powder, the number of baffles is increased to reduce the amount of powder to be cut by one baffle to make the baffle openings. It may also prevent the powder from clogging.

In this case as well, the opening of the baffle plate provided on the upstream side is wider than that on the downstream side.

In the operation of the first embodiment, air as a carrier gas was supplied into the bowl from an inlet of 0.8 l / min, and magnesium spinel powder was supplied to the next process from the outlet 32 at a supply rate of 10 g / min. I was able to send it to.

Further, the carrier air did not leak outside from the bowl or hopper.

As an example of the operation in the second embodiment, carrier gas: oxygen, carrier gas amount: 1.2 l / min, bowl internal pressure:
+ 250mmH ₂ O, powder: zirconia, supply amount: 30g / min, and the powder supply device was continuously operated under this condition (operating cycle of running for a certain time and then resting for a certain time), but the gap 4 was always constant Since the distance was maintained, it was possible to secure a fixed amount of supply while the zirconia was reduced to near the powder discharge port 3 at the lower part of the hopper.

On the other hand, when a coil spring is used as a vibration isolating seat instead of the vibration isolating leaf spring 40, when oxygen of the carrier gas is introduced into the bowl, the bowl 36 is pushed downward by the internal pressure, and eventually the parts feeder main body 41 Is pushed downward, the coil spring contracts, and the parts feeder main body 41 lowers, so that the gap 4 expands.

When the introduction of oxygen is stopped, the pressure drops, the parts feeder body 41 rises, and it returns to its original position, narrowing the gap 4, but
At this time, the powder between the inner bottom surface of the bowl and the powder discharge port is compressed and hardened, and becomes clogged near the powder discharge port.

When a coil spring was used as the vibration isolator under the same operating conditions as described above, the powder was frequently clogged and it was impossible to secure a fixed amount of supply.

As described above, when the bowl is operated with a high internal pressure, by using the leaf spring as the vibration isolator, it is possible to prevent clogging and ensure the constant supply.

In the third embodiment, an attempt was made to fill magnesium (MgO) powder into a hopper without stirring means, vibrate the bowl, and continuously supply the powder to the next step. However, clogging frequently occurred inside the hopper. , Stable supply was impossible.

On the other hand, in this example, by stirring the magnesium powder in the hopper, clogging did not occur and a stable supply could be secured.

In the fourth embodiment, magnesium spinel powder is used,
The amount and accuracy of magnesium spinel discharged from the powder outlet 5 when the voltage of V is applied to the electromagnetic coil is 30
It was 5.4 ± 0.1 g / min in the measurement over the minute.

On the other hand, in the case of a bowl without baffle, even if the discharge voltage of magnesium spinel powder is reduced by lowering the voltage applied to the electromagnetic coil, about 8 g / min is the lower limit of stable supply, 5.4 g / min. However, stable discharge (supply) of a small amount of powder was impossible.

When alumina powder is used in the fifth embodiment and a voltage of 90 V is applied to the electromagnetic coil, the amount and accuracy of the alumina powder discharged from the powder outlet 5 are 2.6 ± in the measurement for 30 minutes.
It was 0.03 g / min, and clogging of the powder did not occur when the two baffles 25 and 26 were provided.

When one baffle plate 25 was removed and only the other baffle plate 22 was provided, clogging occurred at the opening 24, making it impossible to supply a fixed amount.

EFFECTS OF THE INVENTION Since the present invention is as described above, the flow rate per minute time is always constant and can be accurately supplied to the next process, and the powder supply can be performed even if the supply amount in the bowl fluctuates. The amount does not change, and the powder can be continuously supplied in a fixed amount.

Further, even when the voltage of the electromagnetic coil for vibration is lowered to adjust the powder supply amount to a small amount, it can be stably supplied with high accuracy.

Further, even if the pressure of the carrier gas is increased, the gap is kept constant without impairing the powder supply capability, and the powder is stably supplied.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of the first embodiment of the present invention, and FIG.
FIG. 3 is a front view showing an embodiment, FIG. 3 is a sectional view taken along line XX of FIG. 2, FIG. 4 is a longitudinal sectional view of a third embodiment of the present invention, and FIG. 6 is a vertical sectional view of the fourth embodiment,
Figure is an enlarged front view of a portion of Figure 5, Figure 7 is VI of Figure 6.
-VI line sectional view, FIG. 8 is a vertical sectional view of the fourth embodiment of the present invention, FIG. 9 is a front view of a powder feeder using the conventional vibratory component feeder, and FIG. It is a longitudinal cross-sectional view of a part of FIG. 1 …… Bowl 2 …… Hopper 3 …… Powder discharge port 4 …… Gap 6 …… Hopper support 7 …… Mounting stand 10 …… Truck 12 …… Stirring bar 13 …… Jack umbrella 20 …… Baffle plate 21 …… Aperture 23 …… Aperture 24 …… Aperture 30 …… Vibration barrier film 31 …… Inlet 32 …… Discharge port 33 …… Lid 35 …… Hopper 36 …… Bowl 37 …… Connection pipe 40 …… Anti-vibration leaf spring

Continuation of the front page (56) References JP-A-50-55061 (JP, A) JP-A-51-50558 (JP, Y2) JP-A-53-8131 (JP, Y2) JP-A-52-4691 (JP , Y2) Yozo Fujimori, "Handling Illustrated Parts," July 25, 1980, first edition, published by Industrial Research Institute Co., Ltd., pages 18 and 19

Claims (10)

[Claims] 1. A bowl having a spiral track formed therein for transferring powder by vibration; a hopper provided at an upper portion of the bowl for storing powder and having a powder discharge port at a lower portion thereof. ; To prevent the vibration of the bowl from being transmitted to the hopper,
Means for holding each independently; a gap formed between the bottom surface inside the bowl and the powder outlet of the hopper for allowing powder to flow into the bowl; the bowl upper surface and the hopper An anti-vibration membrane for airtightly connecting the outer surface; a lid for airtightly covering the upper surface of the hopper; an upper pressure inside the bowl and an upper pressure inside the hopper Powder for supplying carrier gas to the upper part inside the bowl; discharge port for discharging carrier gas and powder from the inside of the bowl to the outside; Supply device. 2. A bowl having a spiral track formed therein for transferring powder by vibration; a hopper provided at the upper part of the bowl and storing powder at the lower part and having a powder discharge port ; To prevent the vibration of the bowl from being transmitted to the hopper,
Means for holding each independently; a gap formed between the bottom surface inside the bowl and the powder outlet of the hopper for allowing powder to flow into the bowl; the bowl upper surface and the hopper An anti-vibration membrane for airtightly connecting the outer surface; a lid for airtightly covering the upper surface of the hopper; an upper pressure inside the bowl and an upper pressure inside the hopper An inlet for supplying carrier gas to the upper part inside the bowl; a discharge port for discharging carrier gas and powder from the inside of the bowl to the outside; provided between the bottom of the main body and the mount; 2. A powder supply device comprising: a vibration damping material composed of three or more leaf springs radially arranged with respect to the central axis of the main body. 3. The bowl is attached to a mount via a vibration isolator, and
The powder supply device according to claim 1 or 2, wherein the hopper is held on the mount via a hopper support. 4. The powder feeder according to claim 1 or 2, wherein a umbrella is arranged inside the hopper. 5. The powder supply apparatus according to claim 1 or 2, wherein a means for stirring the powder is provided inside the hopper. 6. The powder supply apparatus according to claim 1 or 2, wherein the hopper and a means for stirring the powder are provided inside the hopper. 7. A baffle plate having an opening for allowing only a part of the powder transferred on the upper surface thereof to pass through the track is arranged. The powder supply device according to item 2. 8. A plurality of baffle plates having openings are arranged at intervals in the transfer direction, and the width of the opening of the baffle plate arranged upstream of the flow of powder transfer is Claim 7 is characterized in that it is formed wider than that of the baffle arranged on the downstream side.
Item powder feeder. 9. A hamper having means for agitating powder and a powder inside said hopper, and having an opening for allowing only a part of the powder whose upper surface is transferred to said truck to pass through. The powder supply device according to claim 1 or 2, wherein a plate is arranged. 10. A plurality of baffle plates having openings are arranged at intervals in the transfer direction, and the width of the opening of the baffle plate located upstream of the flow of powder transfer is downstream. The invention is characterized in that it is formed wider than that of the baffle arranged on the side.
Item powder feeder.