JP4067748B2 - Powder filling device - Google Patents

Description

【００１６】
表１から明らかなように加速モードが緩加速で実施されると、その急加速の場合に比べ、粉ダレ時間は短縮されている。ここで、充填装置の高速化を図るには粉ダレ時間の最大値を小さくすることが重要である。
図３は、加速モードの終期に前述した円弧Ｃを有する本実施形態の場合と、円弧Ｃの無い場合との粉ダレ時間の実験結果を示している。図３から明らかなように加速モードの終期に円弧Ｃを有する本実施形態の場合、粉ダレ時間の最大値は大幅に低減されていることが分かる。
【００１７】
次に、以下の表２は動作パターンでの減速モードに関し、オーガ８を第１加速度よりも大きな減速度で急減速する本実施形態の場合と、従来のようにオーガ８をその加速モードでの加速度よりも小さな減速度で緩減速する場合（図２中の１点鎖線参照）との粉ダレ時間の実験結果を示す。
【００１８】
【表２】

【００１９】
表２から明らかなように、減速モードにてオーガ８が急減速されても、粉ダレ時間は殆ど変化していない。これは、前述したようにオーガ８の加速モードが円弧Ｃを有する緩加速（第１及び第２加速度）で実施され、ファネル２内での粉粒体の送り込みが均一になり、しかも、粉粒体のオーバ吐出が低減されている結果、減速モードにてオーガ８の回転が急激に停止されても、その急停止時における粉粒体の慣性エネルギが吐出口１２での粉粒体のブリッジをより強固なものにし、この結果、粉ダレ時間が実質的に変化しないものと考えられる。
【００２０】
したがって、加速モードが緩加速（第１及び第２加速度）で実施されても、減速モードを急減速で実施可能であるから、オーガ８の動作時間を長くしてしまうことはなく、少なくとも粉ダレ時間の短縮が図られる分だけ、充填装置の高速化が可能となる。
上述の実験結果は粉粒体として中挽きのコーヒーを使用して得られたものであり、その中挽きコーヒーの粒度分布は以下の表３に示されている。
【００２１】
【表３】

【００２２】
本発明は上述の実施形態に制約されるものではなく、種々の変形が可能である。例えば、本発明の充填装置は予め準備された容器に粉粒体を充填するものに限らず、製袋と同時に粉粒体の充填を行う製袋充填包装機にも適用可能である。
【００２３】
【発明の効果】
以上説明したように本発明の粉粒体充填装置（請求項１）によれば、オーガスクリューの動作パターン中、その加速モードでの加速を先ず前述の第１加速度にて速やかに実施する一方、加速モードの終期にオーガスクリューの加速を定速モードに向けて逓減させているので（第２加速度）、ファネル内での粉粒体の送り込みが均一になってオーガスクリューの回転に粉粒体の吐出が良好に追従し、粉粒体のオーバ吐出を低減することができ、しかも、減速モードでの減速を第１加速度よりも大きな減速度で実施しても、粉ダレ時間が長くなることはない。この結果、オーガスクリューの動作時間を長くすることなく、粉ダレ時間の大幅な短縮が可能となり、充填装置の高速化に大きく寄与する。
【図面の簡単な説明】
【図１】一実施形態の粉粒体充填装置を示した概略図である。
【図２】オーガの動作パターンを示したグラフである。
【図３】加速モード終期の円弧の有無と粉ダレ時間との関係を示したグラフである。
【図４】従来の一般的なオーガの動作パターンを示したグラフである。
【符号の説明】
２ ファネル
８ オーガ
１２ 吐出口
１４ サーボモータ
２２ サーボコントロールボード
２４ コントローラ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a granular material filling apparatus including an auger screw.
[0002]
[Prior art]
This type of powder filling device, for example, as disclosed in Japanese Patent No. 2745144, controls the rotation of an auger screw (hereinafter simply referred to as an auger) in a funnel according to a predetermined operation pattern, from a funnel outlet. The granular material is discharged, that is, filled, and the filling amount of the granular material is determined by the number of rotations of the auger.
[0003]
As shown by the solid line in FIG. 4, the operation pattern of the auger is defined from the acceleration mode, the constant speed mode, and the deceleration mode. However, the speed of the filling device is increased, that is, the operation time of the auger is shortened. Conventionally, the auger is accelerated rapidly in the acceleration mode.
On the other hand, in the deceleration mode, by slowly reducing the rotation of the auger or by gradually reducing the speed as disclosed in the above publication, the leakage of the granular material from the discharge port after the auger is stopped is reduced. The so-called powder sag time is shortened.
[0004]
[Problems to be solved by the invention]
By the way, it is considered that the above-described powder sag time can be further shortened by further reducing the auger deceleration in the deceleration mode. However, in this case, the operation time of the auger is increased, which increases the speed of the filling device. Inhibits oxidization.
Therefore, in order to increase the speed of the filling apparatus, it is necessary to shorten the powder dripping time without increasing the operating time of the auger. Therefore, the present inventors first measured the change in the discharge amount of the granular material during the operation of the auger, and obtained a measurement result as indicated by a broken line in FIG. 4 from the dashed line in as kana Akira et Figure, the discharge of the granular material is to follow behind the rotation of the auger and rotating the auger after the transition to the constant speed mode is determined by the constant-speed rotation of the auger We discovered that over discharge that exceeds the discharge amount occurred. Such over-discharge occurs when the granular material in the funnel continues to accelerate due to its inertial force even when the rotation of the auger shifts from the acceleration mode to the constant-speed mode. The longer the powder dripping time is, the longer it is.
[0005]
The present invention has been made based on the above-mentioned circumstances, and its object is to reduce the over-discharge of the granular material, shorten the powder sag time, and consequently improve the speed. The object is to provide a body filling device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the granular material filling device of the present invention (Claim 1) controls the rotation of the auger according to the operation pattern, and allows the granular material in the funnel to be discharged from the discharge port by a predetermined discharge amount. Control means for intermittent discharge, and the operation pattern of the control means includes an acceleration mode, a constant speed mode, and a deceleration mode, and the acceleration of the auger screw in the acceleration mode is after the transition from the acceleration mode to the constant speed mode. In addition, it is possible to reduce the amount of discharge of the granular material from the discharge port, which is larger than the discharge amount of the granular material determined by the rotational speed of the auger screw in the constant speed mode, and to quickly reduce the auger screw. The second acceleration at the end of the acceleration mode is gradually reduced toward the constant speed mode, while the auger screw is decelerated in the deceleration mode. It carried out in large deceleration than 1 acceleration.
[0007]
According to the above-described powder particle filling apparatus, the auger is first slowly accelerated in the acceleration mode at the first acceleration that is suppressed to the extent that the above-described over-discharge is reduced, that is, at a slower acceleration than the conventional sudden acceleration . When slow acceleration is performed in this way, the difference in the feeding speed between the granular material in the vicinity of the blade in the auger and the granular material separated from the blade becomes small, and the feeding of the granular material in the funnel is uniform. The discharge amount follows the rotation of the auger well. Moreover, at the end of the acceleration mode, the second acceleration of the auger from Rukoto is diminishing toward the constant speed mode, the rotation of the auger is a smooth transition to the constant speed mode, it is significantly reduced over discharge the aforementioned . As a result, the powder dripping time is shortened. On the other hand, in the subsequent deceleration mode, the auger is decelerated at a deceleration larger than the first acceleration , and the operation time of the auger is not prolonged.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, the powder and particle filling device includes a funnel 2 arranged vertically, and the funnel 2 includes a hopper 4 that receives supply of the powder and a cylindrical portion 6 that is connected to the lower end of the hopper 4. Yes. An auger 8 is rotatably arranged in the funnel 2, and the auger 8 has a spiral wing. A circular drip 10 is attached to the lower end of the auger 8, and this drip 10 forms an annular discharge port 12 between the lower end of the cylindrical portion 6.
[0009]
The shaft of the auger 8 protrudes upward from the hopper 4 and is connected to the output shaft of the servo motor 14. When the servo motor 14 is driven, the auger 8 is rotated in one direction, and the granular material is discharged from the discharge port 12 of the funnel 2 with this rotation.
An agitator 16 is disposed in the hopper 4, and this agitator 16 is supported by a rotating sleeve surrounding the auger shaft via a stay. The rotating sleeve can be rotated by a motor 18. Therefore, the motor 18 rotates the agitator 16 via the rotating sleeve and the stay, and the rotation direction is opposite to the rotation direction of the auger 8.
[0010]
On the other hand, a belt conveyor 20 is disposed below the funnel 2, and containers A that receive powder particles are placed on the belt conveyor 20 at a predetermined interval. The belt conveyor 20 can sequentially position the containers A immediately below the funnel 2 by the intermittent drive.
The servo motor 14 and the motor 18 described above are electrically connected to a controller 24 via a servo control board 22. The controller 24 comprises a microcomputer having a central processing unit (CPU), a memory such as ROM and RAM, an input interface, and the like, and controls the rotation of the motors 14 and 18 via the servo control board 22.
[0011]
More specifically, the operation pattern of the auger 8 is stored in the memory of the control 24. As indicated by the solid line in FIG. 2, the operation pattern is defined from the acceleration mode, the constant speed mode, and the deceleration mode, and the absolute value of the acceleration in the acceleration mode and the deceleration in the deceleration mode with respect to the rotation of the auger 8. , The acceleration is set smaller than the deceleration.
Specifically, the acceleration of the auger 8 in the acceleration mode is determined by the rotational speed of the auger 8 in the constant speed mode after the transition from the acceleration mode to the constant speed mode. This is carried out at an acceleration (first acceleration) that can suppress over-discharge, which is larger than the discharge amount of the granular material, and can quickly accelerate the auger 8.
[0012]
Further, as shown in an enlarged view in FIG. 2, at the end of the acceleration mode, the acceleration (second acceleration) of the auger 8 is gradually decreased, and the rotation of the auger 8 is performed during the transition from the acceleration mode to the constant speed mode. The speed is changed to draw an arc C.
The controller 24 controls the rotation of the auger 8 via the servo control board 22 in accordance with the operation pattern described above, and discharges the granular material from the discharge port 12 of the funnel 2, that is, fills the empty container A by a predetermined amount. . At this time, the agitator 16 is rotated at a constant speed.
[0013]
Thereafter, the belt conveyor 20 is intermittently driven, a new empty container A is positioned immediately below the funnel 2, and the powder filling operation for the container A is repeated.
When the rotation of the auger 8 is controlled according to the operation pattern described above, the discharge amount of the granular material from the discharge port 12 follows the rotation of the auger 8 well as shown by the broken line in FIG. over the discharge of the granular material is significantly low Gensa after archiving the fast mode. That is, since the acceleration of the auger 8 in the acceleration mode is performed at the above-described slow acceleration (first acceleration) , the feeding speed of the granular material in the vicinity of the wing of the auger 8 and the feeding of the granular material away from the wing. The deviation between the speed and the speed is suppressed, so that the feeding of the granular material in the funnel 2 becomes uniform, and the acceleration (second acceleration) of the auger 8 is gradually reduced at the end of the acceleration mode. As a result, when shifting to the constant speed mode, the inertial force of the granular material is suppressed, so that it is considered that the overdischarge of the granular material is reduced.
[0014]
When the overdischarge of the granular material is reduced in this way, the powder dripping time from the discharge port 12 is shortened after the operation of the auger 8 is completed.
Table 1 below shows the operation of the present embodiment that is performed at a slow acceleration (first acceleration) in which the acceleration of the auger 8 in the acceleration mode suppresses the above-described over-discharge and enables the auger 8 to accelerate quickly. The experimental result of the powder dripping time in the case of the pattern and the case of the conventional operation pattern of FIG .
[0015]
[Table 1]

[0016]
Table 1 When the bright et kana as acceleration mode is carried out at moderate acceleration, compared with the case of the sudden acceleration, flour sagging time is shortened. Here, in order to increase the speed of the filling device, it is important to reduce the maximum value of the powder sag time.
FIG. 3 shows the experimental results of the powder sag time in the present embodiment having the arc C described above at the end of the acceleration mode and in the case without the arc C. From Figure 3 of the present embodiment having a circular arc C at the end of the light et kana as the acceleration mode, the maximum value of the powder sag time It can be seen that the greatly reduced.
[0017]
Next, Table 2 below relates to the deceleration mode in the operation pattern, in the present embodiment in which the auger 8 is suddenly decelerated at a deceleration larger than the first acceleration , and the auger 8 in the acceleration mode as in the past . The experimental result of the powder sag time in the case of slow deceleration with a deceleration smaller than the acceleration (see the one-dot chain line in FIG. 2) is shown.
[0018]
[Table 2]

[0019]
From Table 2, as kana Akira et al., It is rapid deceleration auger 8 is in deceleration mode, flour sagging time is hardly changed. As described above, the acceleration mode of the auger 8 is performed by the slow acceleration (first and second acceleration) having the arc C, and the feeding of the granular material in the funnel 2 becomes uniform. As a result of the reduction of the over discharge of the body, even if the rotation of the auger 8 is suddenly stopped in the deceleration mode, the inertia energy of the powder body at the time of the sudden stop causes the bridge of the powder body at the discharge port 12. It is considered that the powder sagging time does not substantially change as a result.
[0020]
Therefore, even if the acceleration mode is implemented with slow acceleration (first and second acceleration) , the deceleration mode can be implemented with rapid deceleration, so that the operating time of the auger 8 is not lengthened, and at least the powder dripping is not caused. The speed of the filling device can be increased as much as the time can be shortened.
The above experimental results were obtained using medium ground coffee as a powder, and the particle size distribution of the medium ground coffee is shown in Table 3 below.
[0021]
[Table 3]

[0022]
The present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the filling apparatus of the present invention is also applicable to advance to prepare containers not limited to also fill the granular material, bag-making filling and packaging machine that performs filling of the bag making the same time granular material.
[0023]
【The invention's effect】
As described above, according to the granular material filling device of the present invention (Claim 1), during the operation pattern of the auger screw, the acceleration in the acceleration mode is first quickly performed at the first acceleration , Since the acceleration of the auger screw is gradually decreased toward the constant speed mode at the end of the acceleration mode (second acceleration) , the feeding of the granular material in the funnel becomes uniform, and the rotation of the auger screw causes the granular material to rotate. discharge satisfactorily follow, it is possible to reduce the over-discharge of the granular material, moreover, also a reduction in the deceleration mode implemented by large deceleration than the first acceleration, the powder sagging time becomes longer Absent. As a result, the powder sag time can be significantly shortened without increasing the operating time of the auger screw, which greatly contributes to the speeding up of the filling device.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an apparatus for filling a granular material according to one embodiment.
FIG. 2 is a graph showing an auger operation pattern.
FIG. 3 is a graph showing the relationship between the presence or absence of an arc at the end of acceleration mode and the powder sag time.
FIG. 4 is a graph showing an operation pattern of a conventional general auger.
[Explanation of symbols]
2 Funnel 8 Auger 12 Discharge port 14 Servo motor 22 Servo control board 24 Controller

Claims (1)

A funnel having a discharge and receiving a supply of powder,
An auger screw rotatably arranged in the funnel;
A control means for controlling the rotation of the auger screw, and intermittently discharging the granular material in the funnel from the discharge port by a predetermined discharge amount ;
The control means has an auger screw operation pattern defined from an acceleration mode, a constant speed mode and a deceleration mode,
The acceleration of the auger screw in the acceleration mode is determined by the rotational speed of the Augustine screw in the constant speed mode after the transition from the acceleration mode to the constant speed mode. In the first acceleration at the end of the acceleration mode, the over-discharge that is increased more than the discharge amount of the granular material to be reduced is performed and the auger screw can be accelerated quickly. 2 Acceleration is reduced toward the constant speed mode,
On the other hand, the deceleration of the auger screw in the deceleration mode is performed at a deceleration larger than the first acceleration .

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