JP2004073957A - Continuously weighing device - Google Patents

Continuously weighing device Download PDF

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Publication number
JP2004073957A
JP2004073957A JP2002235703A JP2002235703A JP2004073957A JP 2004073957 A JP2004073957 A JP 2004073957A JP 2002235703 A JP2002235703 A JP 2002235703A JP 2002235703 A JP2002235703 A JP 2002235703A JP 2004073957 A JP2004073957 A JP 2004073957A
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JP
Japan
Prior art keywords
crushed material
weighing device
continuous weighing
continuous
speed
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.)
Pending
Application number
JP2002235703A
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Japanese (ja)
Inventor
Manabu Takahata
高畑 学
Ryoichi Nishino
西野 良一
Kenichi Jodo
浄土 謙一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diamond Engineering Co Ltd
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Diamond Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Diamond Engineering Co Ltd filed Critical Diamond Engineering Co Ltd
Priority to JP2002235703A priority Critical patent/JP2004073957A/en
Publication of JP2004073957A publication Critical patent/JP2004073957A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuously weighing device which weighs, for example, plastic waste debris exactly and continuously for the safe operation of a combustion apparatus and obtains a discharge speed in a short time. <P>SOLUTION: The continuously weighing device has an annular conveyer, a debris inlet, and a debris outlet positioned different by 180°from the inlet. Blades which are installed radially at equal intervals and divide a space on the annular conveyer are provided on the annular conveyer. The annular conveyer is rotated horizontally around a shaft. An operation means for obtaining the discharge speed of the debris by calculating the mass of the debris packed from the debris inlet and the number of revolution of the blades is provided in the weighing device. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は連続計量装置に関し、さらに詳しくは廃プラスチック等の破砕物をその排出速度の計量を行いながら所定の場所に供給するための連続計量装置に関する。
【0002】
【従来の技術】
従来、廃プラスチックを計量しながら供給するためには、ベルトコンベヤーに計量器を設け、ベルトコンベヤー上の廃プラスチックの質量とベルトコンベヤーの移動速度から排出速度を求めるベルトコンベヤースケールを使用することが広く行われている。
【0003】
しかしながら従来のようなベルトコンベヤースケールの場合、嵩比重が小さく塊を形成しやすい廃プラスチックの破砕物では、流路に大幅な余裕がないとブリッジを形成したり、滞留が生じ、質量の変動が大きくなるために排出速度に大きな誤差が発生する。さらに、このようなブリッジや滞留を防ぐためにコンベヤースケールのサイズを大きくすると下流設備側に大きな制約条件を与えることになり、空気輸送設備等のロータリーバルブ等が設置できない問題を生じる。このようなベルトコンベヤースケールは、片側を固定したテストチェーンにより検定を行うのが通常であるが、実際に計量する質量は、他の部分から完全に縁が切れておらず、秤量器の指示質量の誤差以外にも、設置状態による誤差が多いという問題がある。
【0004】
そして計量が正しく行われないと排出速度の演算が安定しないため、上流側の連続定量抜出装置を正しく制御できなくなり、たとえば破砕物を燃焼装置に燃料として供給する場合、燃焼装置の急激な温度上昇あるいは低下を引き起こすという問題があり、燃焼装置の運転に支障を来たすことになる。
【0005】
【発明が解決しようとする課題】
本発明は、たとえば燃焼装置の安定運転のために廃プラスチック等の破砕物を正確に連続計量し、短時間で排出速度を求める連続計量装置を提供することを目的とする。
【0006】
【課題を解決するための手段】
本発明は、環状コンベア、破砕物投入口および該投入口から180°異なる位置にある破砕物排出口を備え、該環状コンベア上には放射状に等間隔に設けられ該環状コンベア上の空間を分画する羽根を有し、該環状コンベアは軸の周りを水平方向に回転される連続計量装置において、破砕物投入口より充填された破砕物の質量と該羽根の回転数を演算することにより破砕物の排出速度を得る演算手段を備えてなることを特徴とする連続計量装置を要旨とする。
【0007】
【発明の実施の形態】
廃プラスチック等の破砕物はたとえば燃焼装置で燃焼するために、吹込み装置もしくは投入設備の一部として貯蔵サイロ内にいったん貯蔵される。そして、この貯蔵サイロのホッパーから破砕物は連続定量抜き出し装置により抜き出され、ついで連続計量装置へ投入される。
【0008】
連続計量装置の投入口から環状コンベアの1区画内に投入された破砕物Aは、連続計量装置内を半周した後(A‘の位置)、排出口よりロータリーバルブへ供給される。破砕物の種類、大きさは、特に制限されないが、ペットボトル破砕物、紙状フラフ、綿状フラフ等が挙げられ、たとえば2m×2mの廃プラスチックシートをミルで50mm×50mm程度に破砕したものが挙げられる。これらの破砕物の嵩比重は通常0.1kg/L以下である。
【0009】
破砕物の質量は、たとえば3点支持式の、質量をそれに比例した電気信号に変換する変換器であるロードセルで測定されており、この質量と連続計量装置の回転数(rpm)の積を2倍することにより排出速度が求められる。
【0010】
本発明の連続計量装置は、上流側の連続定量抜き出し装置の抜出し量に連動して回転数を変えることができ、この連続計量装置は、常にある一定範囲内の質量を支持するようにされるのが好適である。本発明装置において、さらに好適には、回転数の可変は、攪拌軸駆動モータの回転数変更を交流周波数制御するインバータ制御により攪拌軸を可変速で運転することにより行われ、かつ破砕物を連続計量装置に供給する定量抜き出し装置の排出速度(すなわち連続計量装置に投入される破砕物の量)と連動させるように構成される。質量変動を少なく抑えることにより連続計量装置の回転数は安定し、排出速度の演算が安定して上流側の連続定量抜出装置を正しく制御でき、所定の場所に安定して破砕物を供給できるので、たとえば下流側の燃焼装置の安定運転が可能となる。連続計量装置内は、充填された破砕物の高さを均すためのスクレパーをさらに備えるのが好適である。
【0011】
上記の定量抜き出し装置において、排出は排出速度制御装置によって調節され、インバータ制御(VVVF)により定量抜き出し装置も可変速運転される。すなわち排出速度制御装置により、定量抜き出し装置の運転指令と叩解装置の運転指令を連動させ、叩解装置の回転数が定量抜き出し装置の排出速度に追従して運転される。連続定量抜き出し装置は、破砕物を、連続定量的に抜き出すスクリューフィーダを備える。このスクリューフィーダは多軸スクリューを有するのが好適であり、通常2軸もしくは4軸から選定される。たとえば、2軸の場合、2軸の回転方向が異なるほうが好適である。そして、このスクリューフィーダは好ましくは貯蔵ホッパーの底面全体に配置される。スクリュ−自体の形状はとくに制限されないが、スクリューの回転数も特に制限されないが、たとえば通常10〜150rpmの範囲で可変されるように構成される。さらに好適な態様において、スクリューのピッチは、進行方向へ進むにしたがって大きくなるように構成される。
【0012】
そして、この連続定量抜き出し装置においては、このスクリューフィーダの抜き出し方向のスクリュー末端部には、整流羽根がスクリュー軸上に、流れ方向に配設され、かつ該整流羽根の上方に、流れ方向と直交する方向に掻き取り羽根を配設する必要がある。この整流羽根は好適には矢羽型である。この整流羽根は、スクリュー軸のまわりに3〜6個程度設けるのが好適であり、最も一般的には4個である。一方、掻き取り羽根はその先端がブラシ状であるのが好適である。
【0013】
図1および図2により本発明をさらに詳細に説明する。以下に本発明の実施態様について、図1および図2により詳細に説明する。図1は本発明の1実施態様の全体構成の概略図であり、図2は本発明の連続計量装置の1例を示す平面略図である。破砕物の連続定量抜き出し装置2の上部には、破砕物を貯蔵するための逆テーパー型の貯蔵サイロ1が設置されている。2×2m程度に破砕された廃プラスチックシートは、貯蔵サイロ1の投入口(図示せず)より貯蔵サイロに供給され、下部に設けられた叩解装置(図示せず)により攪拌、解きほぐされる。叩解装置の攪拌軸は駆動モータMにより駆動される。ついで破砕物は連続定量抜き出し装置2により貯蔵サイロより排出される。叩解装置の攪拌軸の駆動モータはインバータ制御(VVVF)により、可変速に駆動される(図示せず)。連続定量抜き出し装置2より抜き出された破砕物(A)は、本発明の連続計量装置4に投入され、半周した後(A’)に排出口より下流側のロータリーバルブに供給される。破砕物の質量は、たとえば3点支持式の、質量をそれに比例した電気信号に変換する変換器であるロードセル6で測定されており、この質量と羽根(すなわち連続計量装置)の回転数(rpm)の積を2倍することにより排出速度が求められる。排出速度制御装置3により、定量抜き出し装置の運転指令と叩解装置の運転指令を連動させ、叩解装置の回転数が定量抜き出し装置の排出速度に追従して運転される。5は回転数制御装置であり、上流側の連続定量抜き出し装置の抜出し量に連動して回転数を変えることができる。回転数の可変は、攪拌軸駆動モータの回転数変更を交流周波数制御するインバータ制御により攪拌軸を可変速で運転することにより行われ、かつ破砕物を連続計量装置に供給する定量抜き出し装置の排出速度(すなわち連続計量装置に投入される破砕物の量)と連動させるように構成されている。
【0014】
【発明の効果】
本発明によれば、嵩比重が小さく塊を形成しやすい廃プラスチック等の破砕物を正確に連続計量し、短時間で排出速度を求めることができる。
【図面の簡単な説明】
【図1】本発明の1実施態様の全体構成の概略図である。
【図2】本発明の連続計量装置の1例を示す平面略図である。
【符号の説明】
1…貯蔵サイロ
2…連続定量抜き出し装置
3…排出速度制御装置
4…連続計量装置
5…回転数制御装置
6…ロードセル
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a continuous weighing apparatus, and more particularly, to a continuous weighing apparatus for supplying a crushed material such as waste plastic to a predetermined place while measuring a discharge speed thereof.
[0002]
[Prior art]
Conventionally, in order to measure and supply waste plastic, it has been widely used to use a belt conveyor scale that installs a measuring device on the belt conveyor and calculates the discharge speed from the mass of the waste plastic on the belt conveyor and the moving speed of the belt conveyor. Is being done.
[0003]
However, in the case of a conventional belt conveyor scale, the crushed waste plastic material having a low bulk specific gravity and easily forming a lump may form a bridge or stagnation if there is no large allowance in the flow path, causing a fluctuation in mass. A large error occurs in the discharge speed due to the increase. Furthermore, if the size of the conveyor scale is increased in order to prevent such bridges and stagnation, a large restriction is imposed on the downstream equipment side, and a problem arises in that a rotary valve or the like of a pneumatic transportation equipment cannot be installed. Such a belt conveyor scale is usually verified by a test chain with one side fixed, but the actual weight to be weighed is not completely cut off from the other parts and the indicated weight of the weighing scale In addition to the above error, there is a problem that there are many errors due to the installation state.
[0004]
If the metering is not performed correctly, the calculation of the discharge rate will not be stable, and it will not be possible to correctly control the continuous quantitative extraction device on the upstream side.For example, when supplying crushed material to the combustion device as fuel, the rapid temperature of the combustion device There is a problem of causing a rise or a fall, which hinders the operation of the combustion device.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a continuous measuring device that accurately and continuously measures crushed materials such as waste plastics for stable operation of a combustion device and obtains a discharge speed in a short time.
[0006]
[Means for Solving the Problems]
The present invention includes an annular conveyor, a crushed material input port, and a crushed material discharge port located at a position 180 ° different from the input port, and radially provided at equal intervals on the annular conveyor to divide a space on the annular conveyor. In a continuous weighing device that is rotated horizontally around an axis, the annular conveyor is crushed by calculating the mass of the crushed material filled from the crushed material input port and the number of rotations of the blade. A gist of the present invention is a continuous weighing device including a calculation means for obtaining a material discharge speed.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The crushed material such as waste plastic is temporarily stored in a storage silo as a part of a blowing device or a charging facility, for example, for burning in a combustion device. Then, the crushed material is extracted from the hopper of the storage silo by the continuous fixed amount extracting device, and then charged into the continuous measuring device.
[0008]
The crushed material A charged into one section of the annular conveyor from the input port of the continuous weighing device is supplied to the rotary valve from the discharge port after making a half turn in the continuous weighing device (position A '). The type and size of the crushed material are not particularly limited, but include crushed PET bottles, paper-like fluff, cotton-like fluff, and the like. For example, a 2 mx 2 m waste plastic sheet crushed to about 50 mm x 50 mm by a mill. Is mentioned. The bulk specific gravity of these crushed products is usually 0.1 kg / L or less.
[0009]
The mass of the crushed material is measured by, for example, a load cell that is a three-point support type converter that converts the mass into an electric signal proportional thereto, and the product of the mass and the rotation speed (rpm) of the continuous weighing device is 2. By multiplying, the discharge rate is determined.
[0010]
The continuous weighing device of the present invention can change the rotation speed in conjunction with the withdrawal amount of the upstream continuous quantification withdrawing device, and the continuous weighing device is designed to always support a certain range of mass. Is preferred. In the apparatus of the present invention, more preferably, the rotation speed is changed by operating the stirring shaft at a variable speed by inverter control for controlling the rotation speed of the stirring shaft drive motor by AC frequency control, and continuously crushing the crushed material. It is configured so as to be linked with the discharge speed of the fixed amount extraction device supplied to the measuring device (that is, the amount of the crushed material input to the continuous measuring device). The rotation speed of the continuous weighing device is stabilized by suppressing the mass fluctuation, the calculation of the discharge speed is stable, the continuous continuous extraction device on the upstream side can be correctly controlled, and the crushed material can be stably supplied to a predetermined place. Therefore, for example, stable operation of the downstream combustion device can be performed. Preferably, the continuous weighing device further includes a scraper for leveling the height of the filled crushed material.
[0011]
In the above-mentioned fixed-rate extraction device, the discharge is adjusted by the discharge speed control device, and the fixed-quantity extraction device is also operated at a variable speed by inverter control (VVVF). That is, the operation command of the fixed amount extraction device and the operation command of the beating device are linked by the discharge speed control device, and the rotation speed of the beating device is operated in accordance with the discharge speed of the fixed amount extraction device. The continuous quantitative extraction device includes a screw feeder that continuously and quantitatively extracts the crushed material. The screw feeder preferably has a multi-screw, and is usually selected from two or four. For example, in the case of two axes, it is preferable that the rotation directions of the two axes are different. And this screw feeder is preferably arranged on the entire bottom surface of the storage hopper. The shape of the screw itself is not particularly limited, but the rotational speed of the screw is not particularly limited, but is usually variable within a range of 10 to 150 rpm. In a further preferred aspect, the pitch of the screw is configured to increase as it proceeds in the traveling direction.
[0012]
In the continuous fixed amount extraction device, a rectifying blade is disposed on the screw shaft in the flow direction at the end of the screw in the drawing direction of the screw feeder, and above the rectifying blade, orthogonal to the flow direction. It is necessary to arrange the scraping blade in the direction in which the scraping is performed. The straightening vane is preferably of the arrow feather type. It is preferable to provide about three to six rectifying blades around the screw shaft, and most commonly four rectifying blades. On the other hand, the tip of the scraping blade is preferably a brush.
[0013]
The present invention will be described in more detail with reference to FIGS. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. FIG. 1 is a schematic diagram of the entire configuration of one embodiment of the present invention, and FIG. 2 is a schematic plan view showing an example of a continuous weighing device of the present invention. An inverted taper type storage silo 1 for storing the crushed material is installed on the upper portion of the continuous crushed material extracting device 2. The waste plastic sheet crushed to about 2 × 2 m is supplied to the storage silo from an inlet (not shown) of the storage silo 1 and is stirred and loosened by a beating device (not shown) provided below. The stirring shaft of the beating device is driven by a drive motor M. Next, the crushed material is discharged from the storage silo by the continuous fixed amount extracting device 2. The drive motor of the stirring shaft of the beating device is driven at a variable speed by inverter control (VVVF) (not shown). The crushed material (A) extracted from the continuous fixed amount extracting device 2 is supplied to the continuous weighing device 4 of the present invention, and after half a circumference (A '), is supplied to the rotary valve downstream from the discharge port. The mass of the crushed material is measured by a load cell 6 which is, for example, a three-point support type converter for converting the mass into an electric signal proportional thereto, and the mass and the rotation speed (rpm) of the blade (ie, the continuous weighing device) are measured. The discharge rate is determined by doubling the product of ()). The discharge speed control device 3 links the operation command of the fixed quantity extraction device and the operation command of the beating device, and the rotation speed of the beating device is operated in accordance with the discharge speed of the fixed quantity extraction device. Reference numeral 5 denotes a rotation speed control device, which can change the rotation speed in conjunction with the withdrawal amount of the continuous quantitative extraction device on the upstream side. The rotation speed is varied by operating the stirring shaft at a variable speed by inverter control for controlling the frequency of rotation of the stirring shaft drive motor by AC frequency control, and discharging the fixed amount extracting device that supplies the crushed material to the continuous measuring device. It is configured to be linked with the speed (that is, the amount of the crushed material input to the continuous weighing device).
[0014]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the crushed material, such as waste plastic, which has a small bulk specific gravity and easily forms a lump, can be accurately and continuously measured, and the discharge speed can be obtained in a short time.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of the overall configuration of one embodiment of the present invention.
FIG. 2 is a schematic plan view showing an example of the continuous weighing device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Storage silo 2 ... Continuous fixed quantity extraction device 3 ... Discharge speed control device 4 ... Continuous weighing device 5 ... Rotation speed control device 6 ... Load cell

Claims (9)

環状コンベア、破砕物投入口および該投入口から180°異なる位置にある破砕物排出口を備え、該環状コンベア上には放射状に等間隔に設けられ該環状コンベア上の空間を分画する羽根を有し、該環状コンベアは軸の周りを水平方向に回転される連続計量装置において、破砕物投入口より充填された破砕物の質量と該羽根の回転数を演算することにより破砕物の排出速度を得る演算手段を備えてなることを特徴とする連続計量装置。An annular conveyor, a crushed material input port, and a crushed material discharge port located at a position 180 ° different from the input port, and on the annular conveyor, blades provided at equal intervals radially to separate a space on the annular conveyor. In a continuous weighing device in which the annular conveyor is rotated in a horizontal direction around an axis, the mass of the crushed material filled from the crushed material inlet and the rotation speed of the blades are used to calculate the discharge speed of the crushed material. A continuous weighing device comprising a calculation means for obtaining the following. 破砕物の排出速度が破砕物の質量と羽根の回転数(rpm)の積を2倍することにより求められる請求項1記載の連続計量装置。The continuous weighing device according to claim 1, wherein the discharge speed of the crushed material is obtained by doubling the product of the mass of the crushed material and the rotation speed (rpm) of the blade. 充填された破砕物の高さを均すためのスクレパーをさらに備えてなる請求項1記載の連続計量装置。The continuous weighing device according to claim 1, further comprising a scraper for leveling the height of the filled crushed material. 回転数が、連続計量装置に投入される破砕物の量により、可変されるように構成された請求項1もしくは2記載の連続計量装置。3. The continuous weighing device according to claim 1, wherein the number of rotations is variable depending on the amount of the crushed material input to the continuous weighing device. 回転数の可変が、攪拌軸駆動モータの回転数変更を交流周波数制御するインバータ制御により攪拌軸を可変速で運転することにより行われ、かつ破砕物を連続計量装置に供給する定量抜き出し装置の排出速度と連動させるように構成された請求項4記載の連続計量装置。The rotation speed is changed by operating the stirring shaft at a variable speed by inverter control for controlling the change of the rotation speed of the stirring shaft drive motor by an AC frequency, and discharging the fixed amount extracting device for supplying the crushed material to the continuous measuring device. The continuous weighing device according to claim 4, wherein the continuous weighing device is configured to be linked with the speed. 計量が3点支持3点計量のロードセルにより行われる請求項1〜5のいずれかに記載の連続計量装置。The continuous weighing device according to claim 1, wherein the weighing is performed by a three-point support three-point weighing load cell. 破砕物が廃プラスチックである請求項1〜6のいずれかに記載の連続計量装置。The continuous weighing device according to any one of claims 1 to 6, wherein the crushed material is waste plastic. 破砕物が、ペットボトル破砕物、紙状フラフもしくは綿状フラフから選ばれる請求項1〜7のいずれかに記載の連続計量装置。The continuous weighing device according to any one of claims 1 to 7, wherein the crushed material is selected from crushed PET bottles, paper fluff, or cotton fluff. 破砕物が紙おむつ材料である請求項7もしくは8記載の連続計量装置。9. The continuous weighing device according to claim 7, wherein the crushed material is a disposable diaper material.
JP2002235703A 2002-08-13 2002-08-13 Continuously weighing device Pending JP2004073957A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8042753B2 (en) 2008-05-14 2011-10-25 Komatsu Ltd. Mobile crusher
US8118246B2 (en) 2008-05-28 2012-02-21 Komatsu Ltd. Mobile crusher
CN106428779A (en) * 2016-12-01 2017-02-22 常州信息职业技术学院 Powder metering filling device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8042753B2 (en) 2008-05-14 2011-10-25 Komatsu Ltd. Mobile crusher
US8118246B2 (en) 2008-05-28 2012-02-21 Komatsu Ltd. Mobile crusher
CN106428779A (en) * 2016-12-01 2017-02-22 常州信息职业技术学院 Powder metering filling device

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