JP2005015148A - Auger screw, vertical type powder filling device and method for operating the same device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize stable constant amount conveyance and to enhance maintenance property by suppressing deposition of wet powder A onto an auger screw 40. <P>SOLUTION: Surfaces of a shaft part 41 and an impeller part 42 of the auger screw 40 are subjected to low friction resin processing. Further, the powder A conveying surface 42a of the impeller part 42 is set to an angle θ approximated to an inclination angle (but an angle less than the inclination angle) that the specific powder A becoming a conveying object slides out against an angle datum line X passing through an apex of the impeller part 42 and vertically crossing a center line O of the shaft part 41. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an auger screw suitable for transporting moist powder containing oil and fat, a vertical powder filling device using the auger screw, and an operation method of the device.
[0002]
[Prior art]
A vertical powder filling apparatus is known as an apparatus for quantitatively filling a powder container into a packaging container. The vertical granular material filling device stores the granular material in an inverted conical hopper, supplies the granular material into a supply cylinder connected to the lower end of the hopper, and also arranges the auger screw disposed in the supply cylinder. It is an apparatus provided with the structure which conveys a granular material in a supply cylinder with this rotation, and discharges it from the lower end opening part of a supply cylinder.
[0003]
Conventionally, dry powder is generally used as a fixed amount of powder by a vertical powder filling device. For this reason, in conventional vertical powder filling devices, a supply cylinder is provided by the weight of the dry powder. The development was placed on how to suppress natural fall (flooding) from the ground.
[0004]
[Patent Document 1]
JP-A-6-340317 [Patent Document 2]
Japanese Patent Laid-Open No. 9-24267 [Patent Document 3]
Japanese Patent Laid-Open No. 2000-1209
[Problems to be solved by the invention]
However, in recent years, vertical powder filling devices have also become versatile, and in particular, there is a demand for quantitative filling of wet powder (eg, soup stock) containing fat and water into a packaging container. It is increasing.
In the case of this kind of moist granular material, it tends to adhere to the surface of the auger screw, so in the conventional auger screw, the amount of adhesion increases as the operating time elapses, and the granular material is found in the supply cylinder. As a result, there is a frequent problem that a fixed amount cannot be stably conveyed or discharged.
[0006]
As a prior art regarding an auger screw, there exists what was disclosed by said patent document 1 thru | or 3. However, the auger screw disclosed in each of these patent documents does not assume the conveyance of wet granular material, and thus cannot solve the above-described problems.
[0007]
The present invention has been made in view of such circumstances, and its purpose is to suppress adhesion of moist granular material to the auger screw, and to achieve stable quantitative conveyance and improve maintainability. is there.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention has a vertically-arranged vertical granular material filling apparatus having a linearly extending shaft portion and a spiral wing portion formed on the peripheral surface of the shaft portion. An auger screw that is coaxially arranged in the supply cylinder and conveys the powder particles supplied from above into the supply cylinder downward along the conveyance surface of the wing part as the shaft part rotates. In
While processing the surface of the shaft part and the wing part with low friction resin,
An angle approximating an inclination angle at which a specific granular material to be conveyed slides with respect to an angle reference line that intersects the center line of the shaft portion perpendicularly with the apex of the wing portion through the apex of the wing portion ( However, it is characterized in that it is set to an angle smaller than the inclination angle.
[0009]
By processing the surface of the shaft portion and the wing portion of the auger screw with a low friction resin, the moistened granular material is easily slipped, and adhesion to the surface is suppressed. Furthermore, by making the granular material conveying surface of the wing part an inclined surface set to the above-mentioned angle, the granular material can easily move downward, and as a result, the granular material adheres more to the auger screw surface. It is suppressed.
[0010]
Here, as the low friction resin processing applied to the surfaces of the shaft portion and the wing portion, fluororesin processing or fluorine impregnation treatment is preferable.
Further, according to the experiments of the present inventors, when a granular material having a sliding inclination angle of 40 to 44 degrees with respect to a flat plate whose surface is processed with fluororesin in the same manner as the wing portion is targeted for conveyance, the wing When the particle transport surface of the part is set at an angle of 30 to 40 degrees with respect to the angle reference line that intersects the center line of the shaft part perpendicularly through the apex of the wing part, the adhesion of the powder is less stable The most preferable effect was obtained in that the quantitative conveyance performed could be continued for a long time.
Furthermore, when a granular material having a sliding inclination angle of 35 to 45 degrees with respect to a flat plate that has been impregnated with fluorine in the same manner as the wing portion is to be conveyed, the granular material conveying surface of the wing portion is When set at an angle of 25 to 35 degrees with respect to an angle reference line that passes through the top of the wing and perpendicularly to the center line of the shaft, stable quantitative conveyance can be sustained for a long time with little adhesion of powder particles. The most preferable effect was obtained in that it was possible.
[0011]
In addition, by forming the corner where the shaft and the powder transport surface of the wings intersect with an arcuate curved surface starting from the central portion of the powder transport surface, the particles to the corner The retention of the body is suppressed, and the granular material can be transported more smoothly.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front cross-sectional view showing a schematic structure of a vertical granular material filling apparatus according to this embodiment. First, the structure of the vertical granular material filling device will be described with reference to FIG.
The vertical granular material filling device is a hopper 10 that stores the granular material A, an agitator 20 that is rotationally driven in the hopper 10, a supply cylinder 30 whose upper end communicates with the hopper 10, and a rotational drive in the supply cylinder 30. An auger screw 40 is provided.
[0013]
The hopper 10 is formed in an inverted conical cylinder shape. The agitator 20 rotates along the inner peripheral surface of the hopper 10 and guides the granular material A stored in the hopper 10 to the supply cylinder 30 connected to the lower end central portion of the hopper 10 while stirring. The supply cylinder 30 has a cylindrical shape and is arranged almost vertically. The auger screw 40 is disposed coaxially in the supply cylinder 30 and is rotationally driven by a drive motor 50 disposed on the upper portion of the hopper 10. In the agitator 20, the flange 21 provided on the outer periphery of the drive shaft of the auger screw 40 is driven by the agitator motor 60, and is rotated at a speed different from that of the auger screw 40. Although the rotation direction of the agitator 20 is the same as that of the auger screw 40 in this embodiment, it may be reversely rotated in accordance with the properties of the granular material.
A packaging container (not shown) is automatically arranged below the supply cylinder 30, and the granular material A discharged from the lower end opening of the supply cylinder 30 is quantitatively filled into the packaging container.
[0014]
Next, the configuration of the auger screw will be described in more detail.
As shown in an enlarged view in FIG. 2, the auger screw 40 includes a linearly extending shaft portion 41 and a spiral wing portion 42 formed on the peripheral surface of the shaft portion 41. 30 is arranged vertically.
[0015]
As the auger screw 40 rotates, the powder A is continuously supplied to the supply cylinder 30 from the hopper 10. Therefore, the granular material A that has entered between the pitches of the wing portions 42 moves downward as the auger screw 40 is rotated so as to be pushed by the weight of the granular material A that is subsequently supplied. . Here, the upper surface of the wing part 42 becomes the conveying surface 42a of the granular material A, and the granular material A moves downward so as to slide on the conveying surface 42a.
[0016]
In order to realize such movement of the granular material A, the auger screw 40 of the present embodiment is subjected to low friction resin processing on the surfaces of the shaft portion 41 and the wing portion 42. Thereby, the frictional resistance of the surface of the auger screw 40 becomes small, and the catch of the granular material A is suppressed. The part subjected to low-friction resin processing is effective only with the conveying surface 42a, but if the low-friction resin processing is applied to the entire surface of the shaft part 41 and the wing part 42, the powder A can be more reliably prevented from being caught. Smooth sliding movement can be realized. As the low friction resin processing, fluororesin processing or fluorine impregnation treatment is preferable because the surface frictional resistance can be extremely reduced.
[0017]
Further, as shown in FIG. 3, the auger screw 40 of the present embodiment has the conveying surface 42 a of the wing part 42 passing through the apex of the wing part 42 and an angle reference line X that intersects the center line O of the shaft part 41 perpendicularly. On the other hand, it is inclined by an angle θ that approximates the inclination angle at which the specific granular material A to be conveyed slides. This inclination angle θ is smaller than the inclination angle at which the granular material A slides.
By inclining the granular material A of the wing portion 42 in this way, the granular material A can be slid down smoothly along the conveying surface 42a.
[0018]
The present inventors repeated the following experiment in order to obtain a suitable inclination angle θ.
That is, the same low friction resin processing as that applied to the surface of the auger screw 40 is applied to the surface of the metal flat plate, and an appropriate amount (10 g in the experiment) of the granular material A to be conveyed is placed on the upper surface of the metal flat plate. And the metal flat plate was made to incline gradually from a horizontal position, and the angle which the granular material A of an upper surface slips with dead weight was measured.
The granular material A specified as the object to be transported is a wet powder soup containing an oil and fat component.
[0019]
This experiment was repeated a plurality of times, and the sliding angle of the powder A was recorded. The metal flat plate subjected to fluororesin processing had a sliding angle of 40 to 44 degrees, and the average sliding angle was 42 degrees. Further, the metal flat plate subjected to the fluorine impregnation treatment had a sliding angle of 35 to 45 degrees, and the average sliding angle was 38 degrees.
[0020]
Based on the above experimental results, the inclination angle θ of the conveying surface 42a of the wing part 42 is adjusted, the specific powder A (element of powder soup) is supplied from the hopper 10 to the supply cylinder 30, and continuous operation is performed. As a result, in the auger screw 40 in which the surfaces of the shaft part 41 and the wing part 42 are processed with fluororesin, when the inclination angle θ of the conveying surface 42a of the wing part 42 is set to an angle of 30 to 40 degrees, the granular material A Stable quantitative conveyance could be sustained for a long time with less adhesion. In addition, when the inclination angle exceeded 40 degrees, the phenomenon that the powder A naturally dropped without being caused by the rotation of the auger screw 40 occurred, and the conveyance amount became unstable.
[0021]
On the other hand, in the auger screw 40 in which the surfaces of the shaft part 41 and the wing part 42 are impregnated with fluorine, when the inclination angle θ of the conveying surface 42a of the wing part 42 is set to an angle of 25 to 35 degrees, Stable quantitative transport with little adhesion could be sustained for a long time. When the inclination angle exceeds 35 degrees, the phenomenon that the powder A spontaneously falls without being caused by the rotation of the auger screw 40 occurs, and the conveyance amount becomes unstable.
[0022]
In the auger screw 40 of the present embodiment, a corner 43 where the shaft portion 41 and the conveying surface 42a of the wing portion 42 intersect is formed by an arcuate curved surface starting from the central portion of the conveying surface 42a. Thereby, retention of the granular material A in the said corner 43 is suppressed, and the granular material A can be conveyed still more smoothly.
[0023]
It is preferable that the above-described vertical granular material filling apparatus is operated by adjusting the rotational speed of the agitator 20 as follows. That is, when the agitator 20 is rotationally driven, the powder A in the hopper 10 is guided to the upper end opening of the supply cylinder 30 and is supplied between the pitches 42 of the auger screw 40. At this time, if the rotational speed of the agitator 20 is too high, the amount of the powder A supplied between the blades 42 pitch of the auger screw 40 increases, and the powder A is compressed between the blades 42 pitch. Get into the dense. As a result, the granular material A is pressed against the conveying surface 42a of the wing part 42, and smooth downward sliding movement is prevented.
Therefore, the agitator 20 is operated by rotating in the same direction as the auger screw 40 or rotating in the reverse direction at a low speed such that the powder A is supplied from the hopper 10 to the supply cylinder 30 without being compressed.
[0024]
In addition, this invention is not limited to embodiment mentioned above.
For example, in the auger screw 40, the inclination angle θ formed by the granular material A conveying surface 42a of the wing part 42 with respect to an angle reference line passing through the apex of the wing part 42 and perpendicular to the center line of the shaft part 41 is It is preferable to adjust suitably according to the granular material A which becomes.
[0025]
【The invention's effect】
As described above, according to the present invention, the adhering of the wet granular material A to the auger screw is suppressed, so that stable quantitative conveyance can be realized and maintainability can be improved.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a schematic structure of a vertical powder filling device according to an embodiment of the present invention.
FIG. 2 is an enlarged front sectional view showing an auger screw and a supply cylinder.
FIG. 3 is an enlarged front cross-sectional view for explaining a characteristic part of an auger screw.
[Explanation of symbols]
A: Powder 10: Hopper 20: Agitator 30: Supply tube 40: Auger screw 41: Shaft 42: Wing 42a: Conveying surface 43: Corner 50: Drive motor 60: Agitator motor

Claims (9)

It has a linearly extending shaft part and a spiral wing formed on the peripheral surface of this shaft part, and is arranged coaxially in the supply cylinder of the vertically arranged vertical powder filling device, In the auger screw that conveys the granular material that has been supplied from above into the supply cylinder, along the conveyance surface of the wing part as the shaft part rotates,
While processing the surface of the shaft part and the wing part, low friction resin,
The granular material conveyance surface of the wing portion approximated an inclination angle at which a specific granular material to be conveyed slides with respect to an angle reference line that intersects the center line of the shaft portion perpendicularly through the apex of the wing portion. An auger screw characterized by being set to an angle (however, an angle less than the inclination angle). The auger screw according to claim 1, wherein a wet granular material is a conveyance target. The auger screw according to claim 1 or 2, wherein a surface of the shaft portion and the wing portion is processed with a fluororesin. With respect to a flat plate whose surface is processed with fluororesin in the same manner as the wing portion, a granular material having a sliding inclination angle of 40 to 44 degrees is targeted for conveyance.
4. The auger screw according to claim 3, wherein the granular material conveying surface of the wing portion is set at an angle of 30 to 40 degrees with respect to an angle reference line passing through the apex of the wing portion and perpendicular to the center line of the shaft portion. The auger screw according to claim 1 or 2, wherein the surfaces of the shaft portion and the wing portion are impregnated with fluorine. With respect to a flat plate whose surface has been impregnated with fluorine in the same manner as the wing part, a granular material having a sliding inclination angle of 35 to 45 degrees is to be conveyed.
6. The auger screw according to claim 5, wherein the granular material conveying surface of the wing part is set at an angle of 25 to 35 degrees with respect to an angle reference line passing through the apex of the wing part and perpendicular to the center line of the shaft part. The auger screw according to any one of claims 1 to 6, wherein a corner portion where the shaft portion and the granular material conveying surface of the wing portion intersect is formed by an arcuate curved surface starting from a central portion of the granular material conveying surface. A hopper for storing powder particles, a supply cylinder whose upper end communicates with the hopper, an auger screw that is driven to rotate within the supply cylinder, and a powder that is driven to rotate within the hopper to the supply cylinder A vertical agglomerate filling apparatus configured to convey the granular material supplied from the hopper to the supply cylinder by rotation of the auger screw and discharge the powder from the lower end opening of the supply cylinder;
The vertical agglomerate filling apparatus, wherein the auger screw is the auger screw according to any one of claims 1 to 7. An operation method for the vertical powder filling apparatus according to claim 8,
An operation method, characterized in that the rotational speed of the agitator is set so that the granular material in the hopper is supplied to the supply cylinder without applying a compressive force other than its own weight to the granular material.

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