JP2021081195A - Powder and granular material quantification feeding device - Google Patents

Abstract

To provide a powder and granular material quantification feeding device which is suitable for quantitatively feeding a powder and granular material having a relatively large particle diameter.SOLUTION: A powder and granular material quantification feeding device comprises: an upper feeding disk 6 which has a circular receiving surface 6a onto which a powder and granular material is put, and rotates; an upper scraper 8 which scrapes off the powder and granular material on the receiving surface 6a; a weighing platform 12 onto which the powder and granular material is put; a smooth surface 10a which is disposed flush with the weighing platform 12 and onto which the powder and granular material is put; a load cell 13 which measures the powder and granular material on the weighing platform 12; and a lower feeding disk 9 which has a mounted vane 9c onto which the powder and granular material scraped off the upper feeding disk 6 toward the weighing platform 12 is put so as to block the powder and granular material from being put onto the weighing platform 12 or the smooth surface 10a. The lower feeding disk 9 is provided with a scraping plate 9d which scrapes off the powder and granular material on the weighing platform 12 to remove the powder and granular material on the weighing platform 12 and which moves the powder and granular material on the smooth surface 10a onto the weighing platform 12.SELECTED DRAWING: Figure 2

Description

The present invention relates to a powder / granular material quantitative supply device, and more particularly to an apparatus suitable for quantitatively supplying powder / granular material having a relatively large particle size.

As described in paragraph 0002 of Patent Document 1 (Japanese Unexamined Patent Publication No. 2019-1374787), in order to quantitatively supply the powder or granular material, a stirring body and a plurality of pocket groups evenly opened in the circumferential direction are used. In many cases, an encircling type feeding device using a rotary member provided with the above is used.

However, for powders (typically, pellet resin, urea, etc.) having a relatively large particle size (for example, 0.5 mm or more), it is difficult to measure the amount with such an apparatus. However, this does not mean that the target is limited to those having a relatively large particle size.

On the other hand, there is also a step method using a supply board having a rotating circumferential receiving surface and a scraper that stands still and scrapes off the powder or granular material on the receiving surface. Here, in order to measure the mass, weight or volume of the powder or granular material, a scale on which the powder or granular material is placed and a sensor attached to the scale are used. However, in the simple step method, the powder or granular material is constantly placed on the scale, and the scale cannot be emptied and the measured value of the sensor cannot be reset to zero.

After all, in the prior art, it is possible to smoothly supply a fixed amount of powders and granules having a relatively large particle size, and to secure the timing for resetting the measured value of the sensor to zero as a premise. , It was virtually impossible.

The present inventors have further improved the step method and earnestly examined whether or not the timing for resetting the measured value of the sensor to zero can be secured, and have completed the present invention.
Japanese Unexamined Patent Publication No. 2019-137487 Japanese Unexamined Patent Publication No. 57-22517

That is, the present invention is based on the step method, and by making it possible to secure the timing for resetting the measured value of the sensor to zero, the powder or granular material suitable for quantitatively supplying the powder or granular material having a relatively large particle size. It is an object of the present invention to provide a fixed quantity supply device.

The powder or granular material quantitative supply device according to the first invention has a rotating shaft that stands up and rotates, and a circumferential receiving surface that rotates by being axially attached to the rotating shaft and on which the powder or granular material is placed. The upper supply board, the upper scraper that scrapes off the powder or granular material on the receiving surface, the scale table on which the falling powder or granular material is placed, and the powder or granular material that is arranged flush with the scale and the falling powder or granular material is placed. The sliding surface is mounted on the scale, the sensor that obtains the measured value of the powder or granular material on the scale, and the upper supply plate and the balance are pivotally attached to the rotating shaft to rotate, and the upper scraper It is provided with a lower supply board having mounting wings for mounting the scraped powder or granular material and blocking the powder or granular material from being placed on the scale or the sliding surface, and the lower supply board is provided with a scale. A scraping plate is provided which scrapes off the powder or granular material on the table, removes the powder or granular material on the scale, and transports the powder or granular material on the smooth surface onto the scale.

In the above configuration, the basics of the step method are satisfied by providing the upper supply plate and the upper scraper that scrapes off the powder or granular material on the receiving surface of the upper supply plate. Therefore, the device is suitable for quantitatively supplying powders and granules having a relatively large particle size.

Finally, the powder or granular material will be placed on either the scale or the sliding surface, but at a predetermined rotation position of the rotation axis (at a predetermined timing and controllable). , The powder or granular material on the scale is removed by the scraping plate, and the scale is emptied. Aiming at this timing, the measured value of the sensor can be reset to zero, and the above-mentioned drawback of the step method can be eliminated. As a result, even powders having a relatively large particle size can be smoothly and quantitatively supplied.

In addition to the first invention, the powder or granular material quantitative supply device according to the second invention further includes a lower scraper that scrapes the powder or granular material on the mounting blade onto the scale or the sliding surface.

With this configuration, the powder or granular material placed on the mounting blade can be reliably scraped off on the scale or the sliding surface.

In the powder or granular material quantitative supply device according to the third invention, in addition to the second invention, a plurality of mounting wings are provided on the lower supply board, and a gap is provided between the plurality of mounting wings. The voids are formed and allow the falling powder or granular material to fall onto the scale or smooth surface without being placed on the mounting wing.

With this configuration, the falling powder or granular material reaches the scale or the sliding surface by two routes. That is, one of them is a route that is mounted on any one of a plurality of mounting wings and then by a lower scraper to reach the scale or the sliding surface via the mounting wings. The other one is a route that directly falls on the scale or the sliding surface without passing through any of the plurality of mounting wings.

In the powder or granular material quantitative supply device according to the fourth invention, in addition to the first invention, directly above the upper supply plate, a scraping plate that blocks the powder or granular material from being placed on the receiving surface and powder or granular material are provided. A casing is provided with an opening that allows the body to rest on the receiving surface.

With this configuration, the powder or granular material charged into the powder or granular material quantitative supply device can reach the receiving surface of the upper supply plate only through the opening, and the movement of the powder or granular material can be easily controlled. ..

In the powder or granular material quantitative supply device according to the fifth invention, in addition to the fourth invention, a stirrer that is axially attached to a rotating shaft at the same level as the casing and agitates the powder or granular material in a horizontal plane located at the level. Further prepare.

In this configuration, by providing the stirring body, it is possible to carry the powder or granular material from the scraping plate to the opening in synchronization with the rotation of the rotating shaft, and it becomes easy to control the movement of the powder or granular material.

In each of the above inventions, the sensor is preferably a load cell.

In this way, a highly accurate sensor can be introduced at low cost.

According to the present invention, it is possible to obtain a powder or granular material quantitative supply device which is provided with an upper supply plate and an upper scraper and adopts a step method to quantitatively supply powder or granular material having a relatively large particle size.

Further, by configuring the lower supply panel as described above, the timing for resetting the measured value of the sensor to zero can be secured, and even a powder or granular material having a relatively large particle size can be smoothly quantitatively supplied.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of the powder or granular material quantitative supply device according to the first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the powder or granular material quantitative supply device.

As shown in FIG. 1, the powder or granular material quantitative supply device in this embodiment is configured. That is, the motor M rotates the output shaft (not shown) at the rotation speed instructed by the control unit C based on the measured value of the load cell 13 (an example of the sensor).

The measured value of the load cell 13 may be any of mass, weight or volume, and if it can be measured with high accuracy, another sensor other than the load cell may be used.

The control unit C increases the rotation speed when the measured value of the load cell 13 is low, and decreases the rotation speed when the measured value of the load cell 13 is high with respect to a predetermined fixed quantity.

The control unit C may use, for example, proportional control, PID control, or the like. However, since the present invention is not characterized by the control method, further detailed description thereof will be omitted.

The speed reducer 1 decelerates the rotation of the output shaft of the motor M according to a predetermined reduction ratio, changes the rotation direction by 90 degrees, and rotates the rotating shaft 2 that stands up. This is because a horizontal speed reducer is used in this example. That is, a vertical speed reducer may be used as is obvious to those skilled in the art, in which case the output shaft of the motor M and the rotation shaft 2 are coaxial or parallel. Further, if possible, the reduction gear may be omitted. In short, it is sufficient if the upright rotating shaft 2 can be appropriately driven, and as long as this condition is satisfied, any configuration adopted will fall within the protection range of the present invention.

The main mechanism of this device is arranged on the upper side of the output shaft 2. Explaining from the upper side, a hopper 4 in which the powder / granular material input port 4a opens upward and divergently is arranged at the uppermost portion. That is, the inlet (primary side) of the powder or granular material is the inlet 4a.

On the other hand, the outlet (secondary side) of the powder or granular material is the discharge port 14a of the cover 14 which is attached downward to the bottom of the main mechanism.

The partial configurations, which are located below the hopper 4 and above the discharge port 14a, overlap vertically, and it is difficult to understand the positional relationship only in FIG. 1, so they are shown as an exploded perspective view in FIG.

In FIG. 2, the substructure is further divided into six subgroups. Of these subgroups, the members fixed to the first casing 5, the second casing 7, the third casing 10, and these casings 5, 7, and 10 from the upper side are immovable in the rotation direction N1 of the rotation shaft 2. is there.

Of course, each of these casings 5, 7, and 10 has a cylindrical side wall, so that the powder or granular material does not leak outward in radius.

However, the configuration shown in FIG. 2 is only an example, and various design changes that are obvious to those skilled in the art can be made, for example, by integrating at least a part of the first to third casings 5, 7, and 10.

On the other hand, from the upper side, the stirring body 3, the upper supply plate 6, and the lower supply plate 9 are all axially attached to the rotating shaft 2 by, for example, a key and a key groove (none of which are shown), and are synchronized with the rotating shaft 2. And rotate.

The first stage from the upper side is a set of the stirring body 3 and the first casing 5.

The stirring body 3 has a truncated cone-shaped main body 3a formed so as to be tapered upward, and a stirring blade 3b provided at the bottom of the main body 3a so as to project outward.

In the illustrated example, four stirring blades 3b are provided every 90 degrees, but this is only an example, and various changes can be made, for example, to 6 or 8 blades.

On the inner bottom of the first casing 5 (that is, directly above the upper supply plate 6), a scraping plate that prevents the powder or granular material from being placed on the receiving surface 6a (which forms a circumferential band) of the upper supply plate 6. 5a and an opening 5b that allows the powder or granular material to be placed on the receiving surface 6a are provided.

As shown enlarged in FIG. 3, the agitator 3 is axially attached to the rotating shaft 2 at the same level as the first casing 5, and the powder or granular material is agitated in the horizontal plane located at this level.

The stirring blade 3b rotates so as to be in contact with the upper surface of the scraping plate 5a or to slide slightly above the upper surface. As a result, the powder or granular material that has reached the inside of the first casing 5 via the hopper 4 is transported to the stirring blade 3b in the circumferential direction, moves on the scraping plate 5a, and reaches the opening 5b. Either it falls on the receiving surface 6a, or it immediately reaches the opening 5b without passing through the scraping plate 5a and falls on the receiving surface 6a.

The second stage from the upper side is a set of the upper supply plate 6 and the second casing 7. As described above, this set is located directly below the first set from the top.

As described above, the upper supply board 6 has a circumferential receiving surface 6a that is axially attached to the rotating shaft 2 and rotates, and on which the powder or granular material is placed.

Further, an upper scraper 8 for scraping off powder or granular material on the receiving surface 6a is fixed to the second casing 7. Although omitted in FIG. 2, as shown enlarged in FIG. 4, an opening 7a is formed behind the rotation direction N1 of the upper scraper 8 and is scraped off by the upper scraper 8. The dust particles fall through the opening 7a into the third set from the top.

By providing the upper supply board 6 and the upper scraper 8, the basics of the step method are satisfied. In this state, as described above, the powder or granular material is continuously dropped, and as a result, the powder or granular material is continuously placed on the scale 12 of the third-stage set from the top.

However, as described below, this problem can be solved by configuring the third set from the top.

The third stage from the top is a set of the lower supply plate 9 and the third casing 10. This set is located directly below the second set from the top, as described above.

The lower supply plate 9 is pivotally attached to the rotation shaft 2 between the upper supply plate 6 and the scale 12 and rotates.

Further, the lower supply plate 9 is placed by placing the powder or granular material that is scraped off by the upper scraper 8 and falling from the opening 7a to prevent the powder or granular material from being placed on the scale or the sliding surface. It has wings 9b and extended mounting wings 9c.

Further, the mounting wing 9b and the expansion mounting wing 9c are provided so that at least one scraping plate 9d hangs down from the mounting wing 9b and the expansion mounting wing 9c.

The scraping plate 9d scrapes off the powder or granular material on the scale 12 to remove the powder or granular material on the scale 12 through the opening 10b, and removes the powder or granular material on the sliding surface 10a through the scale 12a. It is to be transported upward.

As shown in an enlarged view in FIG. 5, in this example, the outer circumference of the lower supply board 9 is divided into 12 parts of 360 degrees, and the mounting blade group 9b having three isomorphisms (30 degree width in angle) is formed. Is provided, and a gap t having a width of 30 degrees is formed between the adjacent mounting blades 9b.

The gap t allows the falling powder or granular material to fall on the scale 12 or the sliding surface 10a without being placed on the mounting blade group 9b or the expanded mounting blade 9c.

Further, the enlarged mounting wing 9c is formed wider (90 degree width in angle) than the other mounting wing groups 9b.

The configurations of the mounting wings and the voids shown in the illustration are merely examples, and the number of blades and the gaps can be changed, and various changes can be made so as to be obvious to those skilled in the art.

On the other hand, on the bottom of the third casing 10, a scale 12 to which the load cell 13 is attached to the bottom surface is provided. The falling powder or granular material is placed on the scale 12.

An opening 10b of the third casing 10 is opened on the front side of the scale 12 in the rotation direction N1, and at the same level as the scale 12, all parts except the opening 10b and the scale 12 are scaled. It is flush with the platform 12 and has an annular sliding surface 10a.

Further, a lower scraper 11 having a lower edge in contact with the upper surfaces of the mounting blade group 9b and the expanded mounting blade 9c is fixed to the inside of the third casing 10.

The lower scraper 11 scrapes the powder or granular material on the mounting blade group 9b or the expanded mounting blade 9c onto the scale 12 or the sliding surface 10a.

Next, the operation and the movement of the powder or granular material in each stage will be described with reference to FIGS. 3 to 9.

First, the powder or granular material charged from the charging port 4a of the hopper 4 is deposited inside the first casing 5 (see FIG. 3).

Here, the powder or granular material located on the scraping plate 5a is transported in the same direction by the stirring blade 3b as the rotation shaft 2 rotates (in the direction of arrow N1), reaches the opening 5b, and reaches the opening 5b of the upper supply plate 6. It falls on the receiving surface 6a.

Further, the powder or granular material directly entered into the opening 5b falls onto the receiving surface 6a without passing through the scraping plate 5a as it is (see arrow N2).

In this way, regardless of which route is taken, the powder or granular material falls from the first stage to the second stage.

As shown in FIG. 4, the powder or granular material on the receiving surface 6a abuts on the upper scraper 8 sooner or later as the upper supply plate 6 rotates in the direction of the arrow N1, and the powder or granular material comes into contact with the upper scraper 8 through the opening 7a. It falls from the first stage to the third stage.

By the way, the powder or granular material that has reached the third stage goes through various routes depending on the rotation position of the lower supply plate 9 (which is also the rotation position of the rotation shaft 2).

First, as shown in FIG. 5, when the mounting blade 9b or the enlarged mounting blade 9c is located directly below the opening 7a of the second stage, the powder or granular material moves and is placed as shown by the arrow N4. It will be temporarily mounted on the wing 9b or the extended mounting wing 9c.

However, when the lower supply board 9 further rotates, the lower edge portion of the lower scraper 11 comes into contact with the mounting wing 9b or the expanded mounting wing 9c, and the powder or granular material becomes the mounting wing 9b or the expanded mounting wing. It will be scraped from above 9c to the adjacent gap t side, and will eventually fall onto the sliding surface 10a or the scale 12 through the gap t.

At the same time, as shown in FIG. 7, the powder or granular material on the sliding surface 10a is moved to the scale 12 side by the scraping plate 9d that hangs downward from the mounting blade 9b or the enlarged mounting blade 9c. The powder or granular material on the 12 is transported to the opening 10b, finally reaches the inside of the cover 14 from the opening 10b, and is discharged from the discharge port 14a to the secondary side.

Next, as shown in FIG. 6, when the gap t is located directly below the opening 7a of the second stage, most of the powder or granular material is the mounting wing 9b or the enlarged mounting wing as shown by the arrow N5. It falls on the sliding surface 10a or the scale 12 through the gap t without passing through 9c.

At the same time, as shown in FIG. 7, the powder or granular material on the sliding surface 10a is moved to the scale 12 side by the scraping plate 9d that hangs downward from the mounting blade 9b or the enlarged mounting blade 9c. The powder or granular material on the 12 is transported to the opening 10b, finally reaches the inside of the cover 14 from the opening 10b, and is discharged from the discharge port 14a to the secondary side.

Regardless of which route is taken, as shown in FIG. 8, the powder or granular material will be placed on the scale 12 and the load cell 13 will obtain the measured values such as the mass, weight or volume of the powder or granular material. , A signal is output to the control unit C, and the rotation speed of the motor M is controlled.

Now, here, the timing of resetting the measured value of the load cell 13 to zero becomes a problem. In the present invention, this problem is solved by the following configuration.

As shown in FIG. 9, the timing at which the expansion mounting blade 9c covers the scale 12 from above depends on the rotation position of the lower supply board 9 (which is also the rotation position of the rotation shaft 2 and can be controlled). is there.

In the state of FIG. 9, the scraping plate 9d hanging downward from the enlarged mounting blade 9c has almost scraped the powder or granular material on the scale table 12, and when the rotation progresses a little from the state of FIG. 9, the scale There are no powders or granules on the table 12.

Moreover, as described above, the enlarged mounting wing 9c is formed to be wider than the other mounting wing groups 9b (in this example, it is tripled but can be changed in various ways), so that the second to third stages are formed. As a result, the movement of the powder or granular material falling to the eyes is blocked by the expansion mounting blade 9c for a relatively long time (one-fourth of the time required for one rotation).

By utilizing this timing, zero reset of the measured value of the load cell 13 can be surely and easily realized.

It will be appreciated that such technical advantages are not available in the prior art and the present invention is practically beneficial.

Hereinafter, the operation seen from the scale 12 on which the load cell 13 is installed will be described with reference to FIG. When the present device is cut on a horizontal plane on which the lower supply board 9 of the third stage can be seen, it becomes as shown in FIG. 10 (a). As described above, in this example, the periphery (ring) of the lower supply board 9 is divided into 12, and the regions R1 to R12 shown in FIG. 10A exist. Regions R2, R4, R6, and R10 are voids t, regions R1, R3, R5, and R11 are mounting wings 9b, and the remaining areas R7 to R9 are extended mounting wings 9c.

When viewed from the scale 12, the regions R1 to R12 appear in front of the eyes in order as shown in a straight line in FIG. 10 (b). After the area R12, the area returns to the area R1.

When the regions R1, R3, R5, R7, and R11 appear in front of the scale 12, as shown in FIG. 10 (c), the powder or granular material p is placed on the scale 12. Therefore, at these timings, the powder or granular material p is measured by the load cell 13.

Further, when the region R9 appears in front of the scale 12, as shown in FIG. 10 (d), the powder or granular material p on the scale 12 is scraped off, and the scale 12 is empty. Therefore, the measured value of the load cell 13 is reset to zero at this timing.

Longitudinal sectional view of the powder or granular material quantitative supply device according to the first embodiment of the present invention. An exploded perspective view of the powder or granular material quantitative supply device according to the first embodiment of the present invention. A perspective view showing a part of the powder or granular material quantitative supply device according to the first embodiment of the present invention. A perspective view showing a part of the powder or granular material quantitative supply device according to the first embodiment of the present invention. A perspective view showing a part of the powder or granular material quantitative supply device according to the first embodiment of the present invention. A perspective view showing a part of the powder or granular material quantitative supply device according to the first embodiment of the present invention. A perspective view showing a part of the powder or granular material quantitative supply device according to the first embodiment of the present invention. A perspective view showing a part of the powder or granular material quantitative supply device according to the first embodiment of the present invention. A perspective view showing a part of the powder or granular material quantitative supply device according to the first embodiment of the present invention. (A) Horizontal sectional view of the powder or granular material quantitative supply device according to the first embodiment of the present invention (b) Operational explanatory view of the granular material quantitative supply device according to the first embodiment of the present invention (c) Implementation of the present invention Operational explanatory view of the powder or granular material quantitative supply device according to the first embodiment (d) Operation explanatory view of the powder or granular material quantitative supply device according to the first embodiment of the present invention.

1 Reducer 2 Rotating shaft 3 Stirrer 3a Main body 3b Stirring blade 4 Hopper 4a Input port 5 1st casing 5a Fray plate 5b Opening 6 Upper supply board 6a Receiving surface 7 2nd casing 8 Upper scraper 9 Lower supply board 9a Boss Part 9b Mounting wing 9c Enlarged mounting wing 9d Scraping plate 10 Third casing 10a Sliding surface 10b Opening 11 Lower scraper 12 Scale base 13 Load cell C Control unit M Motor p Powder / granular material t Gap

Claims (6)

A rotating shaft that stands up and rotates,
An upper supply board that is axially mounted on the rotation shaft, rotates, and has a circumferential receiving surface on which powder or granular material is placed.
An upper scraper that scrapes off the powder and granules on the receiving surface, and
A scale on which the falling powder and granules are placed,
A sliding surface that is arranged flush with the scale and on which the falling powder or granular material is placed.
A sensor that is attached to the scale and obtains the measured value of the powder or granular material on the scale.
The powder or granular material is axially attached to the rotating shaft between the upper supply plate and the scale, and is placed on the powder or granular material scraped off by the upper scraper, and the powder or granular material is placed on the scale or the sliding surface. Equipped with a lower supply board with mounting wings that block it from being mounted on
On the lower supply board, the powder or granular material on the scale is scraped off to remove the powder or granular material on the scale, and the powder or granular material on the smooth surface is transported onto the scale. A powder or granular material quantitative supply device characterized in that a scraping plate is provided. The powder or granular material quantitative supply device according to claim 2, further comprising a lower scraper for scraping the powder or granular material on the wing from the scale or the sliding surface. The lower supply board is provided with a plurality of the above-mentioned mounting blades, and a gap is formed between the plurality of mounting blades. In the gap, falling powder or granular material is previously described. The powder or granular material quantitative supply device according to claim 1 or 2, which allows the powder to fall on the scale or the sliding surface without being mounted on the blade. Immediately above the upper supply plate, a scraping plate that blocks the powder or granular material from being placed on the receiving surface and an opening that allows the powder or granular material to be placed on the receiving surface are provided. The powder or granular material quantitative supply device according to claim 1, wherein the casing to be provided is arranged. The quantitative powder or granular material supply device according to claim 4, further comprising a stirrer which is axially attached to the rotating shaft at the same level as the casing and agitates the powder or granular material in a horizontal plane located at the level. The powder or granular material quantitative supply device according to any one of claims 1 to 5, wherein the sensor is a load cell.

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