JPH0524018Y2 - - Google Patents
Info
- Publication number
- JPH0524018Y2 JPH0524018Y2 JP1987083841U JP8384187U JPH0524018Y2 JP H0524018 Y2 JPH0524018 Y2 JP H0524018Y2 JP 1987083841 U JP1987083841 U JP 1987083841U JP 8384187 U JP8384187 U JP 8384187U JP H0524018 Y2 JPH0524018 Y2 JP H0524018Y2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- hopper
- feeder
- weight
- belt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000843 powder Substances 0.000 claims description 36
- 238000005303 weighing Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 description 12
- 239000008187 granular material Substances 0.000 description 11
- 238000001514 detection method Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000032258 transport Effects 0.000 description 5
- 238000000691 measurement method Methods 0.000 description 4
- 239000000969 carrier Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- -1 powder metallurgy Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
Description
【考案の詳細な説明】
技術分野
本考案は、計量ホツパから排出される粉体の瞬
間重量を測定し、該瞬間重量と粉体を輸送するフ
イーダの速度とを乗算して、粉体流量を連続的に
計測する連続計量フイーダの構造に関する。[Detailed description of the invention] Technical field The invention measures the instantaneous weight of powder discharged from a weighing hopper, multiplies the instantaneous weight by the speed of the feeder that transports the powder, and calculates the powder flow rate. This article relates to the structure of a continuous weighing feeder that measures continuously.
従来技術
近年、粉体工学の応用分野が拡大しており、更
にその速度も早まりつつある。従来、粉体は、食
品、化学原料、化粧品、医薬、農薬等の伝統製品
分野においてみられたが、最近は石油等の液体エ
ネルギに替わる微粉炭を重油、水等に混合して、
界面活性剤等で分散処理したCOM、CWMを初
め、次期素材としてのニユーセラミツクス、粉末
冶金、磁性粉体、エレクトロニクス、印刷等、そ
の応用の裾野は拡がつている。これに伴つて、粉
粒体プロセスの流量を高精度にかつ効率的に計測
することが要求されている。高精度に計測する方
法としては、ホツパスケール式の計量計が一般に
使用されている。ホツパスケールは、基本的に計
量ホツパ、てこ、重量検出装置を含めた計量装置
と、投入ゲート、排出ゲートを含めた供給排出装
置と、設定、比較、演算制御を行なう制御装置か
ら校正されるが、計測精度を満足する計測要素は
計量装置部であり、更に、てこ、重量検出装置の
特性が大きい比重をしめている。近年、重量検出
装置であるロードセルの精度は向上していて、信
頼性も高くなつているので、ホツパスケールの計
測精度も向上している。しかし、ホツパスケール
方式は、定量計量方式、又は定時間計量方式によ
るバツチ計量であり、不連続な計測方式であるた
め効率的な計測は不可能であつた。この問題を克
服するために並列運転式のホツパスケールが試み
られている。該並列運転式のホツパスケールは、
受入ホツパから投入される粉粒体を切換えダンパ
により、併置された計量ホツパの何れか一方を選
択して計測し、計測完了後計量ホツパの排出ゲー
トを開くとともに、他方の計量ホツパに投入する
ように切換えダンパを切換え、この動作を交互に
行なう方法がなされている。しかし、この方法で
は連続計測はなされず効率の面で問題がある。こ
れに対し、連続計測する方法であるコンベヤスケ
ールが多用されている。Prior Art In recent years, the field of application of powder engineering has been expanding, and the pace of application is also accelerating. In the past, powder was used in traditional product fields such as food, chemical raw materials, cosmetics, medicine, and agrochemicals, but recently, pulverized coal has been mixed with heavy oil, water, etc. to replace liquid energy such as petroleum.
The range of applications is expanding, including COM and CWM dispersed with surfactants, new ceramics as next-generation materials, powder metallurgy, magnetic powder, electronics, and printing. Along with this, there is a demand for highly accurate and efficient measurement of flow rates in powder and granular material processes. As a method for highly accurate measurement, a Hopper scale weighing meter is generally used. A hopper scale is basically calibrated using a weighing device including a weighing hopper, lever, and weight detection device, a supply/discharge device including an input gate and a discharge gate, and a control device that performs setting, comparison, and calculation control. The measurement element that satisfies measurement accuracy is the weighing device section, and the characteristics of the lever and weight detection device also have a large specific gravity. In recent years, the accuracy and reliability of load cells, which are weight detection devices, have improved, so the measurement accuracy of hopper scales has also improved. However, the hoppa scale method is a batch measurement method using a quantitative measurement method or a fixed time measurement method, and is a discontinuous measurement method, so efficient measurement is impossible. In order to overcome this problem, a parallel operation type hopper scale has been attempted. The parallel operation type Hoppa scale is
The powder and granules introduced from the receiving hopper are selected and measured by a damper in one of the weighing hoppers placed side by side, and after the measurement is completed, the discharge gate of the weighing hopper is opened and the material is fed into the other weighing hopper. There is a method in which the switching damper is switched to perform this operation alternately. However, this method does not perform continuous measurements and has problems in terms of efficiency. On the other hand, conveyor scales, which are a method of continuous measurement, are often used.
第３図は、コンベヤスケールの基本的な構成を
示すもので、図中、１はエンドレスのベルトで、
該ベルト１は所定の張力を与えてベルトを引張る
テイクアツプーラ４とキヤリアローラ５との間に
巻回されており、図示しないモータにより回転移
動される。該ベルトコンベアの上には供給ホツパ
２に収納された粉粒体３が投入されてキヤリアロ
ーラ５側に輸送されて排出される。アイドラ６は
ベルト下面に配設されベルト１面を平面に保持し
て回転するローラである。キヤリア８及び検出キ
ヤリア７もアイドラ６同様にベルト下面に配設さ
れて回動するローラであるが、検出キヤリア７
は、所定距離２Ｐをもつて配設された２個のキヤ
リア８の中央に位置してキヤリア８間を移動する
瞬間重量Ｗを検出する。ベルト１が水平方向に単
位時間当り重量Ｑで移動すると瞬間重量Ｗ＝QP
となる。この瞬間検出重量Ｗは、支点１１をもつ
てこ１０の力点１２に連結杆９を介して印加され
る。この瞬間粉粒重量Ｗはてこ１０でレバー比
ａ／ｂに変換される動点１３に装着されたロード
セル１４にaw／ｂとして検出される。一方、ベ
ルト１の移動速度Ｖはキヤリアローラ５軸に連結
されたベルト速度検出部１５により回転数ωを検
出され、キヤリアローラ５の直径Ｄと乗算しＶ＝
ωDから求められる。流量積算指示部１６は、こ
れらの演算するもので粉体流量Ｗ・Ｖを演算表示
する。 Figure 3 shows the basic configuration of a conveyor scale. In the figure, 1 is an endless belt;
The belt 1 is wound between a take-up puller 4 that applies a predetermined tension to pull the belt, and a carrier roller 5, and is rotated by a motor (not shown). The granular material 3 stored in the supply hopper 2 is placed onto the belt conveyor, transported to the carrier roller 5 side, and discharged. The idler 6 is a roller that is disposed on the lower surface of the belt and rotates while holding one surface of the belt flat. Like the idler 6, the carrier 8 and the detection carrier 7 are rollers that are arranged under the belt and rotate.
is located at the center of two carriers 8 arranged at a predetermined distance 2P and detects the instantaneous weight W moving between the carriers 8. When belt 1 moves horizontally with weight Q per unit time, instantaneous weight W = QP
becomes. This instantaneous detected weight W is applied to a force point 12 of a lever 10 having a fulcrum 11 via a connecting rod 9. This instantaneous particle weight W is detected as aw/b by a load cell 14 attached to a moving point 13 which is converted into a lever ratio a/b by a lever 10. On the other hand, the moving speed V of the belt 1 is determined by detecting the rotation speed ω by a belt speed detecting section 15 connected to the 5 axes of the carrier roller, and multiplying it by the diameter D of the carrier roller 5, V=
It can be found from ωD. The flow rate integration instruction section 16 calculates and displays the powder flow rate W.V using these calculations.
従来技術の問題点
上述した従来技術は、２個のキヤリア８の間を
移動する粉粒体を検出キヤリア７で検出するもの
であるが、検出キヤリア７に作用する粉粒体の瞬
間重量Ｗを静的に検出する場合は、高精度に検出
可能であるが、動的に検出する場合は、キヤリア
８の回転摩擦の影響を受ける。即ち、キヤリア８
の軸の回転に摩擦がある場合、該キヤリア８上の
ベルト１の移動に伴なう張力の変化が生じ、張力
の変化による反力が検出キヤリア７に及び、誤差
を生ずる。また、粉粒体の流れ状態によつては、
キヤリア８と検出キヤリア７とに配分される重量
比が一定とならず他の誤差要因となるという問題
があり、ベルトコンベヤ方式の重量測定は連続し
た粉体流量を計測することはできても高精度の計
測には不向きであつた。Problems with the Prior Art In the conventional technology described above, the detection carrier 7 detects the powder or granular material moving between two carriers 8, but the instantaneous weight W of the powder or granular material acting on the detection carrier 7 is When detected statically, it is possible to detect with high precision, but when detected dynamically, it is affected by the rotational friction of the carrier 8. That is, carrier 8
If there is friction in the rotation of the shaft, a change in tension occurs as the belt 1 moves on the carrier 8, and a reaction force due to the change in tension is applied to the detection carrier 7, causing an error. Also, depending on the flow condition of the powder or granular material,
There is a problem in that the weight ratio distributed between the carrier 8 and the detection carrier 7 is not constant, which causes other error factors, and although the belt conveyor method of weight measurement can measure a continuous powder flow rate, it is expensive. It was not suitable for measuring accuracy.
問題解決のための手段
本考案は、上述した問題点を解決するため、計
量ホツパから排出される粉粒体を検出する検出手
段を検出キヤリアに精度影響するキヤリアの介入
をなくして高精度に粉粒体重量を検出するもの
で、その手段として計量ホツパから、ベルト又は
スクリユーコンベヤ等の輸送手段に排出される粉
粒体を、該粉粒体が排出される際に、輸送手段に
及ぼすモーメントが等しくなるように支持する支
点を輸送手段に配設して、排出部におけるモーメ
ントの平衡をとり、輸送手段の輸送排出部の粉体
重量を前記支点まわりのモーメントとして検出す
るものである。Means for Solving the Problem In order to solve the above-mentioned problems, the present invention has developed a detection means for detecting powder and granular material discharged from a weighing hopper, which eliminates the intervention of a carrier that affects the accuracy of the detection carrier. This is a device that detects the weight of granules, and the means for detecting the weight of granules is to measure the moment exerted on the transportation means when the granules are discharged from a weighing hopper to a means of transportation such as a belt or screw conveyor. A fulcrum is disposed on the transport means to support the particles so that the powder is equalized, the moment at the discharge section is balanced, and the weight of the powder at the transport discharge section of the transport means is detected as the moment around the fulcrum.
実施例
第１図Ａは、本考案の一実施例を説明するため
の構成図で、計量ホツパ２０に収納された粉粒体
３は、スクリユーコンベア２２内に排出される。
計量ホツパ２０とスクリユーコンベア２２との接
合は蛇腹２４を介して弾性的に行われている。該
蛇腹２４の直径は2l1で、該蛇腹２４の中央部で
スクリユーコンベア２２の下部に支点２５を配設
している。この結果、計量ホツパ２０から排出さ
れる粉体３の重量は、支点２５に関して等しく、
かつ排出に際しての衝撃力による誤差も打消され
る。スクリユーコンベア２２内に内挿されている
スクリユ２３は、スクリユーコンベア２２外に同
軸に装着されたモータ２１により回転駆動され
る。これに従つて、粉体３はスクリユーコンベア
２２の流出口２７より流出され、コンベア２６で
搬出される。スクリユーコンベア２２に作用する
重量は支点２５よりｌの距離にある動点Ｋの位置
で連結杆９を介してロードセル１４に付加され
る。Embodiment FIG. 1A is a block diagram for explaining an embodiment of the present invention, in which powder and granular material 3 stored in a weighing hopper 20 is discharged into a screw conveyor 22.
The weighing hopper 20 and the screw conveyor 22 are elastically connected via a bellows 24. The diameter of the bellows 24 is 2l1 , and a fulcrum 25 is disposed at the center of the bellows 24 and below the screw conveyor 22. As a result, the weight of the powder 3 discharged from the weighing hopper 20 is equal with respect to the fulcrum 25;
Additionally, errors caused by impact force during ejection are also canceled out. The screw 23 inserted into the screw conveyor 22 is rotationally driven by a motor 21 coaxially mounted outside the screw conveyor 22. Accordingly, the powder 3 flows out from the outlet 27 of the screw conveyor 22 and is carried out by the conveyor 26. The weight acting on the screw conveyor 22 is applied to the load cell 14 via the connecting rod 9 at a moving point K located at a distance l from the fulcrum 25.
第１図Ｂは、Ａ図における本考案の作用を示す
ものである。図において、粉粒体がスクリユーコ
ンベア２２内単位長さ当りの重量Ｗとすると、ロ
ードセル１４に作用する力Ｆは、
Ｆ＝１／２（l0 2−l1 2／ｌ） …(1)
である。 FIG. 1B shows the operation of the present invention in FIG. 1A. In the figure, if the weight of the powder per unit length in the screw conveyor 22 is W, the force F acting on the load cell 14 is F = 1/2 (l 0 2 - l 1 2 /l)...(1 ).
また、粉体流量QWは、粉粒体輸送速度をｖと
すると、
Qw＝Ｖ・ …(2)
(1)，(2)から
QW＝Ｖ・2lF／l0 2−l1 2 …(3)
ここで、
2l／l0 2−l1 2＝const＝Ｋ …(4)
とすると、
QW＝Ｋ・Ｆ・Ｖ …(5)
により直接モーメントの力Ｆと、モータ回転数か
ら求めた粉体流速Ｖとを積算することにより粉体
流量を求めることができる。 In addition, the powder flow rate Q W is calculated as Q W = V・...(2) (1), ( 2 ) , where v is the powder transport speed . …(3) Here, if 2l/l 0 2 −l 1 2 = const=K …(4), then Q W = K・F・V …(5) The direct moment force F and the motor rotation speed are The powder flow rate can be determined by integrating the powder flow velocity V determined from .
第２図Ａは、第１図においてのスクリユーコン
ベア２２をテイクアツプローラ３０、キヤリアロ
ーラ３１、エンドレスベルト３２等からなる輸送
手段すなわち第３図に示したベルトコンベア輸送
手段に変更した場合で、第２図Ｂに示した作用は
第１図Ｂと同様な式で表わされる。 FIG. 2A shows a case where the screw conveyor 22 in FIG. 1 is changed to a transportation means consisting of a take-up roller 30, a carrier roller 31, an endless belt 32, etc., that is, a belt conveyor transportation means shown in FIG. The action shown in FIG. 2B is expressed by the same formula as in FIG. 1B.
効 果
上述したように、本考案のコンベヤスケールに
よると、計量方法としては最も単独なてこ方法で
あり、支点まわりのモーメントとしてロードセル
で力計測することにより、計測機構の構成要素か
ら生ずる誤差要素を除き、かつ、この場合の支点
は粉粒体の落下部中心に位置させることによりホ
ツパ内に収納されている粉粒体の重量を平衡させ
て、更に粉粒体の排出による衝撃力の影響を受け
ることもないので、連続計測であるが、高精度の
計測精度が得られる。なお、構成要素は単独なて
こであるため、従来のベルトコンベアスケールに
比べて小形にすることができる。スクリユーフイ
ーダを使用した場合は、微粉体あるいは流動性の
良い粉粒体で、ベルトフイーダで輸送できない場
合とか付着性の強い粉粒体にも適用できるので広
範囲な適用ができる等多くの効果が与えられる。Effects As mentioned above, the conveyor scale of the present invention is the most independent lever method for weighing, and by measuring force with a load cell as a moment around a fulcrum, error elements arising from the components of the measuring mechanism can be eliminated. In this case, the fulcrum is located at the center of the falling part of the powder to balance the weight of the powder stored in the hopper and further reduce the impact force caused by the discharge of the powder. Although the measurement is continuous, high measurement accuracy can be obtained. Note that since the component is a single lever, it can be made smaller than conventional belt conveyor scales. When using a screw feeder, it can be applied to fine powders or powders with good fluidity that cannot be transported using a belt feeder, or to highly adhesive powders, so it can be used in a wide range of applications and has many effects. Given.
第１図Ａは、本考案の一実施例を説明するため
の構成図、第１図Ｂは動作説明図、第２図は、本
考案の他の実施例を示す図、第３図は従来のコン
ベヤスケールの基本例を示す図である。
３……粉粒体、２０……計量ホツパ、２２……
スクリユーコンベヤ、１４……ロードセル、２１
……モータ、２２……スクリユー、２４……蛇
腹、２５……支点。
FIG. 1A is a configuration diagram for explaining one embodiment of the present invention, FIG. 1B is an explanatory diagram of operation, FIG. 2 is a diagram showing another embodiment of the present invention, and FIG. 3 is a conventional diagram. FIG. 2 is a diagram showing a basic example of a conveyor scale. 3... Powder, 20... Measuring hopper, 22...
Screw conveyor, 14...Load cell, 21
... Motor, 22 ... Screw, 24 ... Bellows, 25 ... Fulcrum.
Claims (1)
口と弾性的に接続し、落下した粉体を所定速度で
移動し、排出するフイーダと、粉体落下以前にお
いて該フイーダを前記粉体落下口の中心位置で該
中心の位置に関し等しいモーメントで支持する支
点と、前記フイーダの排出口近傍所定位置で、該
所定位置に作用する力を検出するロードセルとか
らなり、前記フイーダへの粉体落下後の粉体の移
動速度と前記ロードセルの読み値の積とから粉体
流量を求めることを特徴とする連続計量フイー
ダ。 A hopper that accommodates powder; a feeder that is elastically connected to the powder falling port of the hopper and moves and discharges the fallen powder at a predetermined speed; It consists of a fulcrum that supports at the center position of the mouth with an equal moment with respect to the center position, and a load cell that is located at a predetermined position near the discharge port of the feeder and detects the force acting on the predetermined position, and the powder falls to the feeder. A continuous weighing feeder characterized in that the powder flow rate is determined from the product of the subsequent moving speed of the powder and the reading value of the load cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987083841U JPH0524018Y2 (en) | 1987-05-29 | 1987-05-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987083841U JPH0524018Y2 (en) | 1987-05-29 | 1987-05-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63190926U JPS63190926U (en) | 1988-12-08 |
| JPH0524018Y2 true JPH0524018Y2 (en) | 1993-06-18 |
Family
ID=30937795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987083841U Expired - Lifetime JPH0524018Y2 (en) | 1987-05-29 | 1987-05-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0524018Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS457439Y1 (en) * | 1965-03-01 | 1970-04-10 |
-
1987
- 1987-05-29 JP JP1987083841U patent/JPH0524018Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS457439Y1 (en) * | 1965-03-01 | 1970-04-10 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63190926U (en) | 1988-12-08 |
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