JP3268660B2 - Powder supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supplying powder together with a gas, and more particularly to an apparatus suitable for supplying a very small amount of powder while maintaining a constant amount over time.
More specifically, for example, an electro-optical element using liquid crystal,
In particular, an extremely small amount of fine powder is applied to an apparatus for spraying fine powder of several μm to 10 μm as a spacer between two transparent substrates constituting a liquid crystal display panel. The present invention relates to a powder supply apparatus capable of supplying a supply amount in a state where the supply amount does not substantially fluctuate or the fluctuation is extremely suppressed.

[0002]

2. Description of the Related Art In recent years, in the technical fields such as plasma spraying, spacer spraying of liquid crystal substrates, powder compression molding, sandblasting, and powder coating, fine particles of inorganic and organic materials such as metals, ceramics, and plastics are used. There is a need for a device that continuously and quantitatively supplies powder having the same.

[0003] The prior art requiring such powder supply will be described by taking a case of manufacturing a liquid crystal display panel as an example. The liquid crystal display panel is composed of an appropriate portion of two transparent substrates filled with liquid crystal in the middle. A liquid crystal display device that selectively applies an electric field to display information such as specific figures and characters, and forms a panel between two transparent substrates to maintain a uniform gap between them. It is necessary to insert fine powder as a spacer. Conventionally, as a method of inserting the spacer, a wet method and a dry method are known. In the dry method,
A method is known in which fine powder in a dispersed state is sprayed from a nozzle onto a substrate (for example, Japanese Patent Application Laid-Open No. 64-76031).

The fine powder used as a spacer for maintaining the gap between the transparent substrates has a very small particle size of about several μm to about 10 μm, but directly affects the performance of the liquid crystal display panel. Satisfies various requirements regarding the material used, uniformity of particle size, etc., and if the powder to be sprayed is agglomerated to form secondary particles, the substrate spacing cannot be kept uniform so that sufficient dispersion can be achieved. It has been a problem in industrial practice that is being carried out, along with these, well dispersed powder, without uneven distribution in the powder distribution area, even in whole or in part on average It is desired to be sprayed to be present.

[0005] request for such average spraying one For example speaking, for a particular design number that is set, for example, in the range 30 to 200 or so per 1 mm ² of, to free several 1
Severe products that have a tolerance of only about 0 or less, and products that cannot satisfy the requirements as a result of product inspection are regarded as defective products and lower the product yield.

[0006] For this reason, as a spraying method, a method of spraying from a spray nozzle sufficiently separated from the substrate so that the powder can be evenly spread over a wide range, or a method of rotating the spray nozzle not in a fixed manner but by rotating the spray nozzle in a circular shape, is used. There have been proposals for methods for enlarging.

[0007] However, in order to keep the distribution of the scattered powders uniform, the supply state of the powder supplied to the scatterer has an extremely large effect in addition to the scatterer method. For example, in the case of continuously spraying powder, if the supply amount per unit time fluctuates greatly when the continuous supply process is divided into minute unit times, even if the spraying conditions are strictly controlled, there will be no variation. This is because a distribution of the scattered powder having no particles cannot be obtained.

Therefore, as a powder supply device used for applications requiring uniform powder distribution, for example, a screw feeder, a table feeder, a fluidized bed feeder and the like are used.

[0009]

However, the conventional powder supply apparatus as described above has a movable portion having a relatively large structure, and is effective when a large amount of powder having a relatively large particle diameter is supplied. However, for example, 1 g / h to 70 g /
As a device for supplying a very small amount of powder of about h,
There is a problem in that stable powder supply cannot be performed because the amount of powder to be handled is too small, or as a result, the concentration of powder to be supplied fluctuates with time, which is not always appropriate.

In the above-described screw feeder type apparatus, for example, powder is present only in a part of the screw when the powder is clogged over the entire length of the screw and at the beginning or end of operation of the apparatus. In such a case, the powder supply conditions do not match, and an unstable transient state of the supplied powder amount may appear, and depending on the field where this apparatus is used, the product yield may be reduced or this When the powder in the transient state is discarded, waste is increased. Therefore, there is a problem in the case of using expensive powder.

An object of the present invention, which has been made in view of such conventional problems, is to provide a novel powder which can stably supply powder to a spraying apparatus or the like with a concentration as uniform as possible with little variation over time. An object of the present invention is to provide a powder supply device having a configuration.

Another object of the present invention is to provide a powder supply apparatus suitable for constant and constant supply of powder without a transient state from the beginning to the end of the operation of the apparatus. .

Still another object of the present invention is to provide a small-sized apparatus which has a small number of mechanically operating parts, and which is not only capable of providing a compact apparatus, but which is less likely to be mixed with impurities due to contact and abrasion of operating members of the apparatus. It is to provide a device.

Still another object of the present invention is to make the spacer particles interposed between the transparent substrates constituting the liquid crystal display panel extremely expensive in order to satisfy the requirements such as the material and the uniformity of the particle size. Another object of the present invention is to provide a device that can reduce costs by reducing the amount of powder used and can effectively use resources.

[0015]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have completed a novel powder supply apparatus described in each of the claims. Was.

A powder storage portion according to the present invention, a rotating body which rotates around an axis at a predetermined position and has a circumferential groove for filling the powder along a rotating direction on a rotating surface thereof, and a powder of the rotating body ; For filling
A powder filling roll for filling powder into the circumferential groove, and an elongated hollow for powder delivery whose end opening is opposed to the opening of the circumferential groove of the rotating body with a small gap therebetween. A tube, a container forming a space in which the rotating body and an end opening of the hollow tube opposed thereto are sealed from the outside air, and from inside the container toward the hollow tube for powder delivery. Means for providing a constant gas pressure difference between them so that the gas always flows.

The rotating body in the powder supply device of the present invention is:
The shape is not particularly limited, and typically, a shape having a peripheral groove capable of filling powder can be exemplified. For example, a shape having a roll shape, a drum shape, or a belt conveyor shape can be used.
Also, the material is not particularly limited.
Metals such as aluminum and brass can be preferably used. The circumferential groove for filling the powder formed on the rotating surface of the rotating body varies depending on the particle size of the powder to be supplied, the magnitude of the adhesiveness, the supply concentration, and the like, but the supply amount is several g / h to 70 g / h.
As h, for example, a width of 0.2 to 5 mm and a depth of 0.1 to
It can be configured as being within a range of about 2 m.
When the rotating body is a roll, the diameter is 30 to 200 mm
In many cases, it is preferable to use such a material that is rotated at a speed of about 0.1 to 10 rpm. The shape of the circumferential groove may be rectangular in cross section, or a shape in which the filling powder is easily scattered, such as an inverted trapezoidal shape in which the width dimension increases outward in the radial direction, may be appropriately selected.

[0018] circumferential groove is to form the rotation the outer circumferential surface of the B <br/> Lumpur rotating the horizontal rotary axis is generally, Le horizontally rotating around a vertical axis upper surface (the roll (Side).

In the apparatus of the present invention, the elongated hollow tube provided for powder delivery is arranged so as to face the opening of the peripheral groove for filling powder of the rotating body at a constant interval. The scattering portion is formed by being provided, but it is preferable to provide the scattering portion in such a manner that the interval can be changed according to the supply amount and speed of the powder. In many cases, the above-mentioned interval is usually appropriate to be about 0.1 to 5 mm, and the inner diameter of the thin tube is 1 to 10 mm.
The degree is appropriate.

The apparatus according to the present invention is configured such that the above-mentioned rotating body or the like is housed in a container, so that gas flows from the space in the container into the hollow tube facing the opening of the circumferential groove of the rotating body. The gas is circulated and the powder filled in the circumferential groove is entrained and sent out. That is, the powder in the circumferential groove is entrained by the viscosity of the gas flowing into the hollow tube from the gap between the hollow tube and the circumferential groove, and flows through the hollow tube with the powder.

Examples of the gas flow means for allowing the gas to flow into the hollow tube include a method in which the entire container is sealed and a pressurized gas is supplied into the container, or a method in which the pressure in the hollow tube is reduced. Examples of such a device include a device in which an ejector device is provided on the downstream side of the gas flow of the hollow tube. It is preferable that the main body container can be made airtight.

As a means for filling the circumferential groove of the rotating body with the powder, for example, a roll rotating in contact with the rotating body, preferably a roll having a circumferential surface with continuous irregularities on the circumferential surface thereof ( Hereinafter, a “powder press-in roll” can be used, but the present invention is not particularly limited thereto. The powder press-in roll may be provided only on a portion facing the circumferential groove of the rotating body where the strip on the circumferential surface contacts, or may have a smooth circumferential surface without a strip. . It is also preferable that the bottom surface of the circumferential groove for filling the powder of the rotating body be provided as a rough surface or a surface having irregularities continuous in the rotation direction.

The powder press-in roll is provided in a powder storage section provided so that the powder comes into contact with a part of the peripheral surface of the rotating body stored in the container. It is preferable to provide a stirring device, for example, a stirring blade, for feeding the powder into the contact portion between the body press-in roll and the rotating body so as not to be interrupted.

In the present invention, as described above, a scraping means such as a scraper for scraping powder adhered to the peripheral surface of the rotating body is provided. The surface of the powder filled in the circumferential groove is smoothed by the scraping means, and excess powder on the surface of the rotating body is removed. Accordingly, the amount of powder moving into the hollow tube is thereby substantially averaged, and quantitative delivery is effectively realized.

With the above-described structure, the powder delivered from the container housing the rotating body through the hollow tube collides with the inner wall of the tube while moving in the hollow tube.
When flowing into the pipe, it is dispersed even if it is in a state of aggregation to some extent. In order to make the effect of powder dispersion during movement more effective, it is preferable that the diameter of the elongated hollow tube is about 2 to 10 mm and the length of the tube is about 10 times or more the diameter.
When an ejector device is used, since the dispersing action is caused by the ejector, it is possible to shorten the pipe length to obtain a similar dispersion state. Although it depends on the type and particle size of the particles, it is preferable to provide a portion where the gas flow velocity in the tube is 20 to 300 m / s or more in order to enhance the powder dispersion effect during movement.

According to the present invention, more excellent quantitative supply of powder can be realized by adopting a powder transport pipe having the following structure as a hollow pipe for powder delivery. That is, for example, in the powder supplying device having each configuration described above, the hollow tube for powdered delivery, during which leads to the next stage device which is connected, again with branches the tubules forked 1
Adopted to have a branch junction where it is formed so as to merge with the book, and adopts a configuration in which the length of one of the branched narrow tubes and the other narrow tube is made different so that the pulsation of the powder is reduced at this junction. it can.

According to such a configuration, as will be understood from the description of the embodiments described later, the powder delivered to the hollow tube has a pulsation having a substantially constant periodicity, whereas the branched fine tube is used for the powder. The phase of one powder passing through and the other powder passing through, for example, 1 /
By shifting by two, the pulsation of the powder can be significantly reduced.

[0028]

According to the powder supply apparatus of the present invention, the powder is uniformly filled in the circumferential groove for powder filling provided on the rotating surface of the rotating body, especially on the circumferential surface. The powder is scattered by the gas flowing through the opening of the hollow tube facing the tube and is continuously fed into the hollow tube, so that the supply concentration of the powder becomes constant, which is difficult with a conventional powder supply device. 10g /
The supply of a very small amount of powder of h or less can be quantitatively performed. In addition, by adjusting the rotation speed of the rotating body and the width and depth of the peripheral groove for powder filling, it is possible to adjust the amount of powder supplied even when the amount is extremely small, not more than several tens g / h.

Further, for powders having different properties, such as powders having strong adhesion and powders having low adhesion, adjustment of the rotation speed of the rotating body, dimensional change of the width and depth of the circumferential groove, pressure It is easy to select conditions suitable for the target powder by adjusting the difference or the like.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a sectional view showing a schematic configuration of a first embodiment, and FIG. 2 is a sectional view taken along line AA of FIG.

In these figures, reference numeral 1 denotes a main body container of the powder supply device, which is entirely airtight and is sealed from the outside.

The main body container 1 has a first chamber 12 having a powder storage section inside and a second chamber 1 having a powder scattering section 13a.
3 and a peripheral groove 10 for filling the powder, which forms a powder scattering portion 13a together with a thin tube (a hollow tube for delivering powder) to be described later. The grooved roll 2 is housed and arranged, and is rotatably driven by an external motor 11 (see FIG. 2).

In the first chamber 12 forming the powder storage section, a small-diameter powder press-in roll 3 having a streak and having a continuous unevenness in the circumferential direction is housed and arranged. It is pressed so that it rotates in contact. The rotational driving force of the powder press-in roll 3 is provided from the motor 11 via a gear train (see FIG. 2).
Therefore, the grooved roll 2 and the powder press-fit roll 3 are rotated synchronously by one motor 11. This first room 1
2 is filled with powder 6 from a powder inlet not shown.

Reference numeral 4 denotes a stirring blade provided in the first chamber 12, which is a part where the grooved roll 2 having the peripheral groove 10 for powder filling and the powder press-in roll 3 rotate in contact with each other. It is arranged in the vicinity of the inlet side, and is rotated in the direction of the arrow in FIG. 1 so that the stored powder is continuously supplied to the roll rotating inlet side of the contact portion. In this example, the rotation of the stirring blades 4 is also connected by a gear train so as to be given from the motor 11.

Reference numeral 7 denotes a thin tube, which is a circumferential groove 1 of the grooved roll 2.
The lower end openings are opposed to each other at a fixed interval of 0 to form a powder scattering portion 13a for feeding powder from the circumferential groove 10 into the thin tube 7. The thin tube 7 is preferably provided so as to adjust the distance between the lower end opening and the circumferential groove 10, and such a position adjusting mechanism may be configured using, for example, a general screw mechanism (not shown) or the like. it can.

Reference numeral 5 denotes a scraper fixed to the main body container. The scraper 5 comes into contact with the peripheral surface of the rotating grooved roll 2 to scrape off the powder adhering to the peripheral surface of the roll and fill the peripheral groove 10. The surface of the powder is smoothed so as to be flush with the peripheral surface of the roll 2.

In the apparatus of this embodiment shown in FIG. 1, the powder scraped off by the scraper 5 is provided on both sides of the grooved roll 2 so that the powder does not accumulate and hinder the rotation of the roll 2. Each of the small-diameter stepped portions is provided as a powder return portion 9 so that the powder returns to the powder storage portion.

Reference numeral 8 in FIG. 1 denotes an introduction valve interposed in a pipe for introducing a pressurized gas, and introduces the pressurized gas into the second chamber of the main body container. The flow rate of the introduced gas is controlled by the introduction valve 8.
Is provided so as to be adjustable.

The pressurized gas flows into the thin tube 7 with the powder 6 at the powder scattering portion 13a.

The operation of the apparatus having the above-described configuration will be described. The powder 6 is charged into the first chamber 12 which is a powder storage from a powder inlet (not shown), and is stirred by the stirring blade 4. After that, the powder press-fit roll 3 press-fits and fills the circumferential groove 10 of the rotating grooved roll. The powder pressed into the circumferential groove 10 is smoothed by the scraper 5 and moves to the powder scattering portion. The powder 6 scraped off by the scraper 5 and accumulated in the vicinity passes through the powder return portion 9 which is a small-diameter stepped portion as described above, and is returned to the powder storage portion.

With the rotation of the grooved roll 2, the peripheral groove 10 filled with the powder reaches the powder scattering portion 13a where the lower end opening of the thin tube 7 is opposed, and in this portion, as described above. Since gas flows from the second chamber 13 in the pressurized state into the thin tube 7, the gas is caught in the gas flow and
The powder 6 inside flows into the thin tube 7. The powder flowing into the thin tube 7 moves inside the thin tube while colliding with the thin tube wall, and is dispersed into the primary particles even in the agglomerated state.

Test Example 1 A change in the amount of powder flowing through the thin tube over time was measured under the following conditions using the apparatus having the above-described configuration, and the results are shown in FIG. In addition, the measuring method followed the following.

Structure of the apparatus: Rotating body roll Diameter: 100 mm Dimension of circumferential groove Width: 1.4 mm Depth: 0.5 mm Type of powder used: Type of powder Acrylic resin powder Average of powder Particle size 8 μm Type of pressure gas introduced into the second chamber Air Pressure of the second chamber due to pressure gas introduction 1.0 kg / cm ² Diameter of small tube 3 mm Gas flow rate in the small tube 30 m / sec.

As shown in FIG. 5, a laser beam is irradiated so as to pass between a light emitting device 74 provided at one end of a straight tubular portion 73 of a thin tube and a light receiving device 75 provided at the other end. A photovoltaic device that converts the amount into a voltage using a photocell is provided, and the voltage output when no powder flows through this capillary tube, and the voltage that indicates the decay rate due to dust when a standard amount of quantitative powder flows. Using the output as a guide, the amount of flowing powder when the powder to be tested was flowed was measured. FIG. 5 shows a bifurcated branch (7
1, 72) is adopted.
Is not directly related.

From the results shown in FIG. 3, although a small pulsation appears, the amount of powder supplied to the next-stage device through the thin tube is 10 ± 1 mg per second, which is less than several tens g / h. In a very small amount range that could hardly be realized, a quantitative supply that was satisfactory to the purpose was practically realized.

Embodiment 2 FIG. 4 is a schematic diagram showing a second embodiment of the present invention.
The main body container 1 constituting the powder supply device and the internal configuration thereof are the same as those in FIGS. The feature of the second embodiment is that the means for scattering the powder 6 into the thin tube 7 is provided with an ejector device 14 on the downstream side of the thin tube so that the inside of the thin tube is reduced in pressure with the injection of the high-pressure gas. It is in the place.

According to this embodiment, the same effect as that of the first embodiment can be obtained, and further, there is an advantage that the effect of dispersing the powder is further improved by the action of the ejector device.

Embodiment 3 FIG. 5 is a view for explaining the present embodiment in which an apparatus for reducing pulsation of powder is provided on the downstream side of a thin tube. That is, the powder supplied from the powder supply device of FIG. 1 may generate the pulsation described in FIG. 3 above, depending on the properties of the powder and the like. In the example, the thin tube 7 is bifurcated in the middle and is formed so as to merge again into one, and the other thin tube 72 is connected to the other thin tube 71 so as to reduce the pulsation of the powder at the merging point. The tube length is increased. In order to reduce the pulsation of the powder, it is desirable to change the length of the branched thin tube so that the pulsation cycle of the powder is shifted by １ ／ cycle.

The pulsation reducing mechanism shown in FIG. 5 is connected to the apparatus shown in FIG. 1, and the time-dependent change in the amount of powder that has joined after branching is measured in the same manner as in Example 1. The results are shown in FIG. Indicated.

In the pulsation reducing mechanism, a 4 mmφ thin tube was branched, and one of the branched thin tubes was 2 mmφ × 3 m, and the other was 3 mmφ × 4.5 m.

As can be seen from the measurement results shown in FIG. 6, compared with the output of the powder dust concentration meter (see FIG. 3) supplied from the powder supply device of the first embodiment which does not use the pulsation reduction mechanism, Fig. 6 The output of the dust concentration meter shows that the fluctuation is 10 ±
0.2 mg, and the quantitative feeding performance was improved.

The pulsation reducing mechanism provided in the thin tube portion of the present embodiment is independently applied and exerts its effect in the application for the purpose of supplying a constant amount of powder.

Embodiment 4 In this embodiment shown in FIG. 7, an endless belt 23 having no circumferential groove is used in place of the rotary roll in the above embodiment.
The basic configuration is different in that the endless rotation is performed, and the related configuration is different accordingly, but the other configurations are substantially the same.

That is, the endless belt 23 is endlessly wrapped by a pair of upper and lower pulleys 21 and 22, and the lower drive pulley 22 is
The powder is pressed and adhered to the belt surface as shown in the drawing by an adhesion roll 26 buried in the powder 25 stored in the inside 4 and having flexible blades 27.

In the course of the rotation of the endless belt 23, a scraper 28 for making the thickness of powder adhered to the outer surface of the belt constant is provided, and a scraper 28 with a predetermined gap from the outer surface of the belt. A thin tube 29 whose opening faces is provided. Reference numeral 30 denotes a motor for rotationally driving the drive pulley 22, 31 denotes a main body container for accommodating the above structure, 32 denotes an opening / closing valve provided in the middle of a pipe for introducing a pressurized gas into the main body container, 33 Is an exhaust valve.

According to the above configuration, the powder thinly adhered to the surface of the endless belt 23 can be supplied continuously and quantitatively through the thin tube 29. In this embodiment, as shown in the figure, the opening of the thin tube 29 facing the belt 23 is formed in a cone shape. However, this is the same in the first to third embodiments. An appropriate cone shape is selected to adjust the flow velocity of the flowing gas.

Fifth Embodiment The present embodiment shown in FIG. 8 is used to generate a gas flow from the main body container 31 to the thin tube 29 of the powder supply device having the structure described in the fourth embodiment. 14 illustrates an example in which the ejector device 34 described in Example 2 is used.

Also in this example, the effects described in the second and fourth embodiments can be obtained.

Embodiment 6 The present embodiment shown in FIG. 9 is the same as Embodiment 4 except that the drive pulley 22 is provided so as to come into contact with the powder stored in the hopper 36 oscillated by the spring 38. Is shown.

According to this embodiment, substantially the same effects as those of the above embodiment can be obtained.

Embodiment 7 FIG. 10 shows a grooved roll 41 having a circumferential groove 42 used in the apparatus of the embodiment 1 and the like, which is formed on the bottom surface of the circumferential groove to have circumferentially continuous irregularities. The grooved roll 41 of this example is a stepped roll in which the center in the width direction forms a large-diameter portion 411 with a groove formed in the peripheral surface, and both sides form a small-diameter portion 412. The main body 410 has a structure in which rolls 413 and 413 with flanges having concave portions 414 fitted to these small-diameter portions 412 are fastened with bolts 415. Since the diameter of the flanged roll 413 is provided to be larger than the large diameter portion 411 of the stepped roll body 410, the large diameter portion 4 of the stepped roll body 410 is provided.
The peripheral surface of the peripheral groove 11 forms the bottom surface of the peripheral groove, whereby a peripheral groove having a gear-shaped bottom surface having irregularities continuous in the circumferential direction on the bottom surface is formed.

By using the grooved roll 41 having the configuration of this embodiment, the powder filled in the circumferential groove is in a state of being bitten by the irregularities, thereby preventing the powder from falling off. The body is easily sucked by being divided into the irregularities on the bottom surface of the circumferential groove, and the temporal variation in the amount of powder blown due to the rotation is further suppressed. The pitch of the irregularities on the bottom surface of the circumferential groove is not particularly limited, but a pitch of about 0.2 mm can be exemplified as a suitable one.

The bottom surface of the circumferential groove may be roughened by sandblasting the inside of the groove of the grooved roll, as shown in FIG. 11, for example. The effect of suppressing the variation over time of the blowing amount can also be obtained.

Embodiment 8 The present embodiment shown in FIGS. 12 and 13 shows an embodiment in which the rotating body is constituted as a rotating body 51 which rotates horizontally about a vertical axis.
The rotating body 51 has a circumferential recess 51 near the outer peripheral edge.
1 and a circumferential groove 5 is provided at a radially intermediate position of the concave portion 511.
12 and a powder press-in roll 513 for filling the powder is arranged so as to rotate in contact with a part of the circumference thereof, and the powder press-in roll 513 is provided at a position slightly upstream of the rotational rotation side of the contact rotation position. The body storage tank 514 is arranged so that powder can be supplied into the recess from the lower part thereof, and the powder on the surface of the recess on both sides of the opening of the circumferential groove 512 is further disposed at a slightly downstream position on the rotation reciprocating side of the contact rotation position. The scraper 515 for scraping is provided.
Further, reference numeral 516 denotes a fine tube for powder delivery, which is disposed substantially on the opposite side of the powder press-in roll 513, 517 denotes a motor for rotating the rotating body 51, and 518 denotes a powder press-in roll 5
Reference numeral 13 denotes a rotation drive motor.

Each of the devices having the above-described structure is connected to the airtight container 5.
19, the gas is supplied from the container 519 to the inside of the thin tube 516 by the supply of the pressure gas.

With the above-described apparatus having a rotating body that rotates horizontally around a vertical axis, continuous supply of a small amount of powder with little fluctuation can be realized as in the above embodiment.

[0068]

As described above, according to the powder supply apparatus of the present invention, it is possible to quantitatively supply a very small amount of powder of, for example, about several tens g / h or less at a constant concentration. There is an effect.

Further, since the supply of the powder is stopped immediately after the rotation of the rotating body is stopped, a stable and constant supply of the powder is ensured without a transient state from the beginning to the end of the operation of the apparatus. realizable.

Further, the apparatus of the present invention not only can provide a small-sized apparatus having a small number of mechanically operating parts, but also has an effect that there is little possibility of impurities being mixed due to contact and wear of the apparatus operating members.

Further, the use of a pulsation reducing mechanism reduces the fluctuation of the powder supplied from the powder supply device, thereby improving the quantitative supply performance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a configuration outline of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an output diagram of a dust concentration meter for powder supplied from the powder supply device of the first embodiment.

FIG. 4 is a sectional view showing a schematic configuration example of a device according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram showing an outline of a configuration of an apparatus according to a third embodiment provided with a pulsation reducing mechanism of the present invention.

FIG. 6 is an output diagram of a dust concentration meter for powder supplied from a powder supply device provided with a pulsation reduction mechanism according to the third embodiment.

FIGS. 7A and 7B are cross-sectional views showing an example of a schematic configuration of a device according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a schematic configuration example of an apparatus according to a fifth embodiment of the present invention.

FIGS. 9A and 9B are cross-sectional views showing a schematic configuration example of a device according to a sixth embodiment of the present invention.

FIG. 10 is a diagram for explaining an embodiment of a rotating body in which circumferential irregularities are formed on the bottom surface of a circumferential groove.

FIG. 11 is a view for explaining a method of processing a rotating body having a rough bottom surface of a circumferential groove.

FIG. 12 is a vertical cross-sectional front view showing a schematic configuration of an eighth embodiment of a powder supply device in which a circumferential groove is provided on an upper surface of a rotating body that horizontally rotates around a vertical axis.

FIG. 13 is a plan view of the device of the eighth embodiment.

[Description of Signs] 1 ... Main body container, 1a ... Partition wall, 2 ... Roll with roll, 3 ... Powder press-in roll, 4 ... Stirring blade, 5 ... Scraper, 6 ... Powder, 7 ... Narrow tube, 8 ... Gas introduction valve , 9 ... powder return part,
10: circumferential groove, 11: motor, 12: first chamber, 13: second
Chamber, 13a: powder scattering section, 14: ejector device, 1
6. Gas introduction valve.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Eiji Shinoda 2-23-16 Midorigaoka, Oimachi, Iruma-gun, Saitama Prefecture Nisshin Seifun Oirido (72) Hideo Moriyama 1-17-8 Nishibori, Urawa-shi, Saitama Kamimiya 2-201 (56) References JP-A-63-230422 (JP, A) JP-A-2-40730 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65G 53 / 00-53/28 B65G 53/32-53/66 B65G 65/30-65/48 G02F 1/13 101 G02F 1/1339 500

Claims (4)

(57) [Claims] 1. A rotating body having a powder storage portion, a rotating groove which rotates around an axis at a predetermined position and has a circumferential groove for filling the powder along a rotating direction on a rotating surface thereof, and a powder filling of the rotating body . Circumferential groove for
A powder filling roll for filling the powder into the powder, an elongated hollow tube for powder delivery whose end opening is opposed to the opening of the circumferential groove of the rotating body while maintaining a small gap, A container forming a space in which the rotating body and the end opening of the hollow tube facing the same are sealed from the outside air, and a gas is constantly supplied from inside the container toward the hollow tube for delivering powder. Means for providing a constant gas pressure difference between them so that they flow. Wherein Oite to claim 1, the powder filling rolls, powder supplying device, characterized in that those having Aise' rotating surface irregularities are continuous in the direction of rotation. 3. Oite to claim 1 or 2, the bottom surface of the circumferential grooves for the powder filling of the rotating body, powder, characterized in that the irregularities on the rough surface or the direction of rotation is formed as a continuous surface Body feeding device. 4. In the middle of an elongated hollow tube for powder delivery which conveys a powder kept in a substantially constant amount together with gas in one direction, the hollow tube is branched into two branches and one tube is again formed. A branch junction pipe formed so as to merge with the first and second branch pipes, wherein one of the branched pipes and the other branch pipe are provided so as to have different pipe lengths in the branch range. A powder transport pipe used in the powder supply device according to any one of claims 3 to 10.