JP4845120B2 - Powder filling device - Google Patents

Description

  The present invention relates to a granular material filling device that conveys a granular material supplied into a supply cylinder by rotational driving of an auger shaft, discharges the granular material from a discharge port, and fills a packaging container.

An auger type powder filling apparatus is known as an apparatus for quantitatively filling a powder container into a packaging container.
FIG. 6 is a front sectional view showing a schematic structure of a conventional auger type powder filling apparatus. As shown in the figure, the auger type powder filling device includes an inverted conical cylindrical hopper 10, a supply cylinder 20 connected to the top of the lower end of the hopper 10, and an auger disposed on the central axis of the supply cylinder 20. A shaft 30 is provided. The auger shaft 30 is rotationally driven by a drive motor 35 provided above the hopper 10.

The powder A is filled in the hopper 10, is transported downward in the supply cylinder 20 by the fins 31 as the auger shaft 30 rotates, and is discharged from the discharge port 21. Since the discharge amount of the granular material A depends on the rotation amount of the auger shaft 30, it can be arbitrarily adjusted by the control of the drive motor 35.
In general, a packaging container (not shown) is disposed at a lower position of the supply cylinder 20, and the granular material A discharged from the discharge port 21 is quantitatively filled into the packaging container.

  Now, in such a granular material filling device, there is a problem of powder dripping in which the granular material A falls due to its own weight from the discharge port 21 of the supply cylinder 20 after the auger shaft 30 is stopped. The powder filling apparatus causes a drop in filling accuracy in which the filling amount into the packaging container does not match due to the occurrence of the powder dripping.

In order to solve the above-mentioned problems, the present applicant has previously proposed the powder particle filling apparatus disclosed in Patent Document 1. In the granular material filling device of Patent Document 1, a scraper that rotates on a track that is close to and opposed to the outer peripheral edge of the lower end opening (discharge port) is provided at the tip of the auger shaft. With this scraper, the powder filling device can scrape the discharged matter adhering to the outer peripheral edge of the lower end opening (discharge port), and prevents powder soaking and realizes highly accurate quantitative filling.
JP 2004-276955 A

  However, in the granular material filling apparatus of Patent Document 1, since the scraper is below the lower end opening (discharge port) of the supply cylinder even during the filling of the granular material, the granular material adheres to the scraper itself, and the adhesion In some cases, the granular material dropped at an unexpected timing, and the filling accuracy was lowered.

  The present invention has been made in view of such circumstances, and is in a retreat area where the granular material does not adhere during filling of the granular material, and scrapes off the granular material adhered to the discharge port after filling of the granular material. An object of the present invention is to provide a granular material filling device that prevents the adhesion of the granular material to the discharge port and the scraper by providing the scraper and realizes stable quantitative filling. The discharge port includes the lower end opening of the supply cylinder and its peripheral part.

In order to achieve the above-described object, the present invention provides a hopper for storing powder particles, a supply cylinder whose upper end communicates with the hopper, an auger that has a spiral fin on its peripheral surface and rotates within a hollow portion of the supply cylinder. In a granular material filling device having a configuration including a shaft and discharging the granular material supplied from the hopper into the supply cylinder from the discharge port below the supply cylinder by rotation of the auger shaft,
Equipped with a scraper to scrape off the powder particles adhering to the discharge port,
The scraper has a configuration in which the range from the retraction area where the granular material does not adhere to the adhesion area where the granular material adheres is the moving range below the discharge port,
In addition, the scraper is in a retracted area while the auger shaft is rotating, and is configured to pass through the adhesion area when the auger shaft stops rotating.

  According to such a configuration, when the auger shaft rotates and discharges the granular material, the scraper is retracted from the discharge port, so that the granular material can be stably filled and the scraper On the other hand, no powder particles are attached. Moreover, after discharge | emissioning a granular material, a scraper passes, and the granular material adhering to a discharge outlet can be scraped off.

  In addition, a scraper driving device is provided outside the supply cylinder, and the scraper is formed in a rod shape or a long plate shape, and the driving device swings the moving range around one end as a swing center. Can do. As a result, the drive device may have a simple configuration that performs only reciprocating swinging motion, and simplification of the device can be realized.

  Further, the scraper driving device is synchronized with the operation of the auger shaft so as to start acceleration before the auger shaft stops rotating so that the scraper passes through the adhesion region while the auger shaft stops rotating. It is preferable to control. By controlling the scraper in this manner, the scraper can quickly pass through, and the granular material adhering to the discharge port can be quickly scraped off, and the filling speed of the granular material can be increased.

  Furthermore, it is preferable that the drive device is provided at the lower outer periphery of the supply cylinder via a holding plate that can be detachably attached to the outer peripheral surface of the supply cylinder. Accordingly, the scraper and the drive device can be easily attached and detached, and maintenance management becomes easy.

  As described above, according to the granular material filling apparatus of the present invention, the scraper is in the retreat area during the filling of the granular material, and the granular material attached to the discharge port after scraping the granular material is scraped off. Therefore, it is possible to prevent the powder particles from adhering to the discharge port and the scraper and to realize stable quantitative filling.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 to FIG. 3 are diagrams for explaining the powder particle filling apparatus according to the first embodiment of the present invention, and FIG. 1 schematically illustrates the entire configuration of the powder particle filling apparatus according to the present embodiment. It is side surface sectional drawing shown in. Moreover, FIG. 2 is the figure which showed the lower end part of the supply cylinder of the granular material filling apparatus which concerns on this embodiment, (a) is side sectional drawing, (b) is a bottom view.
Similarly to the conventional apparatus shown in FIG. 6, the granular material filling apparatus according to the present embodiment also has a hopper 10, a supply cylinder 20, an auger shaft 30 having a helical fin 31, and a drive for rotationally driving the auger shaft 30. A motor 35 is provided. As shown in FIG. 2, the powder filling device has a cap 22 screwed into the lower end of the supply cylinder 20. A hole serving as the discharge port 21 is formed in the bottom surface of the cap 22, and a chrysanthemum 25 is disposed above the hole.

As shown in FIG. 2 (b), the chrysanthemum 25 of the present embodiment is formed in a knitted pattern by a plurality of frame bars 26. When the auger shaft 30 is rotated, the granular material is discharged from the gap between the frame bars 26. Further, when the rotation of the auger shaft 30 is stopped, the frame bar 26 can effectively suppress the fall due to the weight of the granular material.
The shape of Kikuza 25 is not particularly limited, and various shapes may be applied depending on the type of discharged powder and the like, and specifications that do not use Kikuza 25 are also possible. it can.

  As shown in FIG. 2A, the powder particle filling apparatus of the present embodiment has a scraper 40 made of a long metal plate disposed at the lower end of the chrysanthemum 25. One end of the scraper 40 is held by the rotating shaft 46 of the driving device 45, and the other end is a free end extending to the opposite side of the discharge port 21. The scraper 40 uses the one end held as a swing center, and sets the range from the retreat area where the granular material does not adhere below the discharge port 21 to the adhered area where the granular material adheres as a moving range, In this configuration, the powder particles adhering to the seat 25 and the cap 22 are scraped off.

  Here, it is preferable that the scraper 40 has a surface facing the chrysanthemum 25, that is, an upper surface formed into a smooth surface having a small frictional force. By making the upper surface a smooth surface with a small frictional force, the scraped particles can be dropped as they are without attaching to the surface of the scraper 40.

  The driving device 45 of the scraper 40 is provided with a holding plate 47, and the holding plate 47 is fitted to the lower end of the supply cylinder 20 while being locked to the cap 22. That is, the drive device 45 is configured to be provided at the lower outer periphery of the supply cylinder 20 via the holding plate 47 that can be detachably attached to the outer peripheral surface of the supply cylinder 20. Further, the scraper 40 held by the rotating shaft 46 of the driving device 45 can be disposed at a position facing the cap 22 via a slight gap by the holding plate 47. The scraper 40 held on the rotating shaft 46 of the driving device 45 can swing in parallel to the discharge port 21.

  The drive device 45 includes an air cylinder (not shown) as an internal mechanism, and has a function of reciprocatingly rotating the rotary shaft 46 by supplying air. The driving device 45 is connected to the control device 50, and the air supply is controlled by the control device 50 (see FIG. 1). The control device 50 is connected to the drive motor 35 of the auger shaft 30 together with the drive device 45, and simultaneously controls the rotational drive of the auger shaft 35. Thereby, the swing of the scraper 40 held by the driving device 45 is controlled in synchronization with the operation of the auger shaft.

  As shown in FIG. 2B, in the scraper 40 of the present embodiment, two standby positions a and b are set in the retreat area that is out of the discharge port 21. The drive device 45 is configured to cause the scraper 40 to swing between the standby positions a and b. Here, for example, in the powder and particle filling device of the cited document 1, the scraper is always placed below the discharge port, and the powder and particles are deposited on the scraper. However, in the granular material filling apparatus of the present embodiment, the scraper 40 is positioned at the standby positions a and b during the filling of the granular material, so that the accumulation of the granular material can be prevented.

Further, the swinging of the scraper 40 is controlled by the control device 50 so as to pass through the adhesion region below the discharge port 21 after the rotation of the auger shaft 30 is stopped. The scraper 40 moves one way from the standby position a to the other standby position b after discharging the granular material by the rotation of the auger shaft 30, and after discharging the next granular material, the other standby position b. It is the structure which moves one return path from.
Therefore, the scraper 40 is not located below the discharge port 21 during discharge of the granular material, and can be filled stably and the granular material is not attached to the scraper. Moreover, after discharge | emissioning a granular material, the scraper 40 passes through an adhesion | attachment area | region, and the granular material adhering to the chrysanthemum 25 or the cap 22 can be scraped off.
Note that the standby position of the scraper 40 is not limited to two places on both sides of a and b. For example, only the standby position a on one side and the scraper 40 is attached by reciprocating once in the attachment region. It is good also as a structure which scrapes off.

FIG. 3 is a timing chart showing the control of the scraper of the granular material filling device according to the present embodiment.
As shown in the figure, the control device 50 starts the acceleration of the drive device 45 of the scraper 40 before the auger shaft 30 stops rotating, moves within the retreat area from the standby position a or b, and stops the rotation of the auger shaft 30. Immediately after that, the attachment region is passed. Further, the control device 50 controls the movement to start decelerating after passing through the adhesion area of the scraper 40 and to start rotating the auger shaft 30 so that the granular material is discharged after the scraper 40 is stopped.

  For this reason, the scraper 40 can quickly pass through the adhesion region, and the powder particles adhering to the discharge port 21 can be quickly scraped off. It is possible to carry out high quantitative filling. Further, the rotation stop time of the auger shaft 30 necessary for the scraping operation can be shortened, and the filling speed of the granular material can be increased.

  The present invention is not limited to the above-described embodiments, and various modifications and application examples are possible. For example, the member applied as the scraper 40 may be a rod-shaped member or a plate material with sharp edges.

[Second Embodiment]
FIG. 4 is a diagram showing a granular material filling apparatus according to the second embodiment of the present invention.
As shown in the figure, the scraper may be provided with a cleaning means for removing powder particles that may adhere to the upper surface. As the cleaning means, as shown in FIG. 4, for example, an air blowing device 60 may be provided in the vicinity of the driving device 45. The air blowing device 60 has a configuration in which when the scraper 40 has moved to the standby position a, the powder particles adhered by passing through the adhesion region are blown away by the injection of compressed air. The air blowing device 60 is preferably controlled by the control device 50 in synchronization with the reciprocating drive of the scraper 40 and the rotational drive of the auger shaft 30. The function of the air blowing device 60 can prevent the accumulation of powder particles on the scraper 40.
The cleaning means is not limited to the air blowing device, and various means can be applied. For example, it is good also as a structure which scrapes off the adhering granular material by providing the brush which contacts the scraper 40 in the outer periphery of the discharge outlet 21. FIG.

[Third Embodiment]
FIG. 5 is a view showing a granular material filling apparatus according to the third embodiment of the present invention.
As shown in the figure, the scraper 40 can also be configured to scrape off the powder particles by linearly reciprocating with respect to the discharge port 21. The drive device 45 has a mechanism that linearly reciprocates the scraper 40.
As described above, the scraper 40 may pass through the lower part of the discharge port 21 after discharging the powder and scrape off the powder and the driving method thereof is not particularly limited.

It is side surface sectional drawing which showed typically the whole structure of the granular material filling apparatus which concerns on 1st Embodiment of this invention. It is the figure which showed the lower end part of the supply cylinder of the granular material filling apparatus which concerns on this embodiment, (a) is side sectional drawing, (b) is a bottom view. It is a timing chart which shows control of the scraper of the granular material filling apparatus which concerns on this embodiment. It is a figure which shows the granular material filling apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows the granular material filling apparatus which concerns on 3rd Embodiment of this invention. It is side surface sectional drawing which showed typically the whole structure of the conventional granular material filling apparatus.

Explanation of symbols

10: Hopper,
20: supply cylinder, 21: discharge port, 22: cap, 25: chrysanthemum, 26: frame bar,
30: Auger shaft, 31: Fin, 35: Drive motor,
40: scraper, 45: drive device, 46: rotating shaft, 47: holding plate,
50: control device,
60: Air blowing device,
A: granular material, a, b: standby position

Claims (4)

A hopper for storing powder particles; a supply cylinder whose upper end communicates with the hopper; and an auger shaft that has a spiral fin on its peripheral surface and rotates within a hollow portion of the supply cylinder. In the granular material filling device configured to discharge the granular material supplied into the cylinder from the discharge port below the supply cylinder by rotation of the auger shaft,
A scraper that scrapes off the powder and particles adhering to the discharge port,
The scraper has a configuration in which a range from a retraction area where the granular material does not adhere below the discharge port to an adhesion area where the granular material adheres is a moving range,
The scraper is in the retraction area while the auger shaft is rotating, and passes through the adhesion area when the auger shaft stops rotating. Body filling device. A drive device for the scraper is provided outside the supply cylinder,
2. The granular material filling device according to claim 1, wherein the scraper is formed in a rod shape or a long plate shape, and the driving device swings the moving range with one end as a swing center. .
The scraper driving device is synchronized with the operation of the auger shaft and starts acceleration before the auger shaft stops rotating, and the scraper moves the attachment area while the auger shaft stops rotating. It is controlled so that it may pass, The granular material filling device of Claim 2 characterized by the above-mentioned. 4. The granular material filling device according to claim 2, wherein the driving device is provided at a lower portion of the outer periphery of the supply tube via a holding plate that can be detachably attached to the outer peripheral surface of the supply tube. .

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