JPS5862540A - Device for detecting grain size distribution of loose material - Google Patents
Device for detecting grain size distribution of loose materialInfo
- Publication number
- JPS5862540A JPS5862540A JP56162343A JP16234381A JPS5862540A JP S5862540 A JPS5862540 A JP S5862540A JP 56162343 A JP56162343 A JP 56162343A JP 16234381 A JP16234381 A JP 16234381A JP S5862540 A JPS5862540 A JP S5862540A
- Authority
- JP
- Japan
- Prior art keywords
- size distribution
- particle size
- photodetector
- signal
- conveyor
- 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
Links
- 238000009826 distribution Methods 0.000 title claims abstract description 46
- 239000000463 material Substances 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims description 58
- 238000004364 calculation method Methods 0.000 claims description 5
- 239000013590 bulk material Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- -1 ore Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sorting Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、コンベヤ上を搬送されるばら物の粒度分布
を検知する装置に関し、特に、コンベヤ上の検知ライン
部を照射する光照射手段と、検知ライン部からの反射光
の光度を検知する光検知手段と、検知した光度信号を粒
度分布信号に変換する変換手段とを設けてばら物の粒度
分布を非接触で連続的に検知することにより、工程中の
ばら物の粒度管理を容易にする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting the particle size distribution of bulk materials conveyed on a conveyor, and in particular to a device for detecting the particle size distribution of bulk materials conveyed on a conveyor, and in particular, a light irradiation means for illuminating a detection line section on the conveyor, and a device for detecting the particle size distribution of bulk materials conveyed on a conveyor. By providing a light detection means for detecting the luminous intensity of light and a conversion means for converting the detected luminous intensity signal into a particle size distribution signal, the particle size distribution of loose materials can be continuously detected in a non-contact manner. facilitates granularity management.
石炭の選炭、鉱石や砕石の選鉱、製鉄所のベレタイジン
グ、セメントのクリンカ工程などのばら物を取扱う作業
において、生産品の品￥を管理上、生産工程中のばら物
の粒度分布を管理することは重要である。この管理は、
最終工程に限らず、各生Ｓ＜工程、すなわち、供給点、
中間点で・も必較とさｆＬ、その管理が不充分であると
生産品の品質が低下する。In operations that handle bulk materials such as coal preparation, ore and crushed stone processing, beretizing in steel plants, and cement clinker processes, management of the product quality and particle size distribution of bulk materials during the production process. is important. This management is
Not limited to the final process, each raw S<process, that is, the supply point,
Even at the intermediate point, it is necessary to check the quality of the product, and if its management is insufficient, the quality of the product will deteriorate.
従来、これらの粒度分布は、サンプリング装置などにょ
シ所定の工程からサンプルをｍＪｌｉｎ、篩分けによシ
粒度分布を検べることか行なわれていた。また、近年で
は、篩分けに代えて、サンプルを重力落下させレーザー
光による粒子の回折像を特殊な回転フィルタを通じてマ
イクロコンピュータで解析する装置なども一部使用され
ている。Conventionally, these particle size distributions have been determined by measuring the sample from a predetermined process such as a sampling device and sieving it. In addition, in recent years, instead of sieving, some devices have been used in which the sample is dropped by gravity and the diffraction image of the particles by laser light is analyzed using a microcomputer through a special rotating filter.
しかしながら、これらの方法では、工程のラインからサ
ンプルを採取する操作を必要とし、そのサンプルの粒度
分布の解析の情報を直ちに生産工程、例えば破砕機、摩
砕機などへフィードバックして制御することができない
欠点があった。However, these methods require the operation of collecting a sample from the process line, and it is not possible to immediately feed back and control the analysis information of the particle size distribution of the sample to the production process, such as a crusher or a grinder. There were drawbacks.
この発明は、ばら物の粒度分布検知におけるかかる問題
を解決するものである。而して、この発明の目的は、長
い分析時間を必要としないばら物の粒度分布検知装置を
提供するにあり、また、この発明の目的は、非接触で連
続的に所定の工程の可動コンベヤ上で粒度分布を検知で
きるばら物の粒度分布検知装置を提供するにあり、さら
に、この発明・の目的は、検知した粒度分布の情報を制
御できる装置を提供するにある。This invention solves this problem in detecting the particle size distribution of loose materials. SUMMARY OF THE INVENTION An object of the present invention is to provide a particle size distribution detection device for bulk particles that does not require a long analysis time. It is an object of the present invention to provide a particle size distribution detection device for bulk materials that can detect the particle size distribution as described above, and a further object of the present invention is to provide a device that can control information on the detected particle size distribution.
すなわち、この発明は、図示する実施例の如く、ばら物
１を搬送するコンベヤ２上の検知ライン部６を照射する
光照射器４と、通過するばら物１０粒子と粒子間空隙と
によって変化する前記検知ライン部３からの反射光を受
光して光度を電気的信号として出力する光検知器５と、
該光検知器５に接続されており、その光検知・器５の出
力する光度信号を受けて粒度分布信号に変換する変換器
６とを具ｆ＋ｉｉｉすることを特徴とするばら物１の粒
度分布検知装置１０に係る。That is, as in the illustrated embodiment, this invention changes depending on the light irradiator 4 that irradiates the detection line section 6 on the conveyor 2 that conveys the bulk material 1, the 10 particles of the bulk material passing through, and the spaces between the particles. a photodetector 5 that receives the reflected light from the detection line section 3 and outputs the luminous intensity as an electrical signal;
A particle size distribution of a bulk material 1, characterized in that a converter 6 is connected to the photodetector 5 and receives a luminous intensity signal output from the photodetector 5 and converts it into a particle size distribution signal. It concerns the detection device 10.
以下図面に基づいてこの発明を説明する。第１図は、こ
の発明の一実施例の構成を示しており、ばら物１を搬送
するラインに設けられたコンベヤ２トの任意地点の略中
央線に近く、ばら物１上層部のｔ■１位長さをばら物１
の粒度分布をｔ＋−ａ＋＋するだめの検知ライン部６と
して設定し、コンベヤ２の土）ｉ Ｋこの検知ライン部
６を照射ｉｌ能な光照射器４が設けられている。この光
照射器４は、ばら物１の粒度や性状により、照明灯、レ
ーザ光線などを適宜選択［７、コンベヤ２の進行方向の
前後に複数個設けて、検知ライン部３において、ばら物
１の粒子の表面構造に影響されず均一な反射光が得られ
るように設定するのが望ましい。光照射器４は、電源９
に接続されている。The present invention will be explained below based on the drawings. FIG. 1 shows the configuration of an embodiment of the present invention, in which a conveyor 2 installed on a line for conveying bulk materials 1 is located near the approximate center line of an arbitrary point, and t 1st place length 1
A light irradiator 4 capable of irradiating the soil of the conveyor 2) i K is set as a detection line section 6 that has a particle size distribution of t+-a++. This light irradiator 4 selects an illumination lamp, a laser beam, etc. as appropriate depending on the particle size and properties of the loose material 1. It is desirable that the setting be such that uniform reflected light can be obtained without being affected by the surface structure of the particles. The light irradiator 4 is powered by a power source 9
It is connected to the.
検知ライン部３の直上には、検知ライン部３を通過する
際光照射器４によって照射されるばら物１の、粒子と粒
子間空隙とによって生ずる明暗。Immediately above the detection line section 3 are brightness and darkness caused by particles and interparticle spaces of the bulk material 1 irradiated by the light irradiator 4 when passing through the detection line section 3 .
す々わち、反射光の光度を検知するだめの、光検知器５
が設けられている。この光検知器５は、検知ライン部６
からの反射光を受光するための受光レンズ（図示せず）
、受光により電気信号を出力する光電管、トランジスタ
受光素子などの光検手段（図示せず）、電気信号を増巾
する増巾器（図示せず）等で構成されている。In other words, a photodetector 5 for detecting the luminous intensity of reflected light.
is provided. This photodetector 5 has a detection line section 6
A light receiving lens (not shown) for receiving reflected light from the
, a photodetector (not shown) such as a phototube that outputs an electrical signal by receiving light, a transistor light-receiving element, and an amplifier (not shown) that amplifies the electrical signal.
光検知器５の出力側に接続して変換器６が設けられてい
る。この変換器６は比較部７と演算部８を有している。A converter 6 is provided connected to the output side of the photodetector 5. This converter 6 has a comparison section 7 and an arithmetic section 8.
比較部７には、比較器７ａと基準光度を設定する設定器
７ｂとがあシ、設定器７ｂに検知対象たるばら物１によ
り夫々定まる基準値が設定されて、設定光度信号り。を
出力する。設定器７ｂは、比較器７ａに接続されている
ので、光検知器５の出力する光度信号りが、比較部７に
入ると、比較器７ａでり。と比較され、Ｌ≧Ｌ。The comparator 7 has a comparator 7a and a setter 7b for setting a reference luminous intensity, and a reference value determined by the loose object 1 to be detected is set in the setter 7b, and a set luminous intensity signal is generated. Output. Since the setting device 7b is connected to the comparator 7a, when the luminous intensity signal output from the photodetector 5 enters the comparator 7, it is output from the comparator 7a. and L≧L.
の場合ＬＩＩＬ＜ＬＯの場合り、の信号が比較器７ａか
ら出力される。第２図は、光検知器５により得られる光
度信号り、第３図は、比較部７からの出力信号り１．Ｌ
、を示している。If LIIL<LO, a signal is output from the comparator 7a. 2 shows the luminous intensity signal obtained by the photodetector 5, and FIG. 3 shows the output signal 1. from the comparator 7. L
, is shown.
ここで、検知ライン部３を通過するばら物１Ｄ粒子は信
号ＬＩＴ粒子間空隙は信号Ｌ２ に対応している。故
に、この粒子のコンベヤ２の進行方向についての粒子径
Ｄｉは、コンベヤ２の速度をｖ１出カイＭ号Ｌ１ の
信号時間をＴｉとするとき、Ｉ）ｉ＝Ｖ’ｌＩで求める
ことができる。Here, the loose 1D particles passing through the detection line section 3 correspond to the signal LIT, and the interparticle gaps correspond to the signal L2. Therefore, the particle diameter Di of the particles in the traveling direction of the conveyor 2 can be determined by I)i=V'lI, where the speed of the conveyor 2 is v1 and the signal time of the output chi M L1 is Ti.
従って、比較器７ａからの信号”１ １ Ｌ２ を受け
て演算部８で上代より粒子径Ｄｉが演°算さね、さらに
、所定の時間内におけるＤｉ値を累積することにより、
粒度分布が求めら１する。こうして得らｉｌだ粒度分布
は、従来の方法で求めらｒる粒度分布に近似し、実用上
問題はない。第４図は、粒度分布曲線を示している。演
算結果は、このような粒度分布曲線や粒度分布表として
出力することにより、ばら物１の粒度分布を知ることが
できる。Therefore, upon receiving the signal "1 1 L2" from the comparator 7a, the calculation unit 8 calculates the particle diameter Di from the above value, and further accumulates the Di values within a predetermined time, so that
The particle size distribution is determined. The particle size distribution obtained in this manner approximates the particle size distribution obtained by conventional methods, and poses no practical problem. Figure 4 shows the particle size distribution curve. By outputting the calculation results as such a particle size distribution curve or a particle size distribution table, the particle size distribution of the bulk material 1 can be known.
さらに、この粒度分布の情報を直接生産工程にフィード
バックし工程を制御することも可能である。Furthermore, it is also possible to feed back this particle size distribution information directly to the production process to control the process.
例えば、第１図に示す如き破砕機１１と、該破砕機１１
へ被破砕物を供給する供給コンベヤ１２と、破砕機１１
で破砕されたばら物１を搬送するコンベヤ２とよりなる
破砕工程では、この粒度分布検知装置１０を用いてばら
物１の粒度分布を次のように制御できる。まず、破砕機
１１用制御装［１３を設けて、これを粒度分布検知装置
１１〕の変換手段６の出力例に接続する、この破砕機１
１用制御装置１６は、破砕機１１の開口の大きさ、破砕
時間などを制御するためのものであり、粒度分布検知装
置が検知出力する生産品たるばら物１の粒度分布情報が
フィードバックされて、ｈ「定粒度と異る場合破砕機１
１をばら物１が所定粒度となる方へ操作する。また、供
給コンベヤ１２には、供給コンベヤ１２用制御装置１４
を設けて、前記破砕機１１用制御装置１３の出力例に接
続する。For example, a crusher 11 as shown in FIG.
A supply conveyor 12 that supplies materials to be crushed to the crusher 11
In the crushing process which includes the conveyor 2 that transports the crushed bulk material 1, the particle size distribution of the bulk material 1 can be controlled as follows using this particle size distribution detection device 10. First, a control device for the crusher 11 [13 is provided, and this is connected to the output example of the converting means 6 of the particle size distribution detection device 11].
1 control device 16 is for controlling the opening size, crushing time, etc. of the crusher 11, and is fed back with particle size distribution information of the bulk product 1 detected and output by the particle size distribution detection device. , h "If the particle size is different from the fixed size, crusher 1
1 is operated so that the bulk material 1 has a predetermined particle size. The supply conveyor 12 also includes a control device 14 for the supply conveyor 12.
is provided and connected to the output example of the control device 13 for the crusher 11.
この供給コンベヤ１２用制御装置１４は、被破砕物供給
量を制御するだめのものであり、破砕機１１用制御装置
１３の制御信号により、破砕機１１の制１ａｌｌ Ｉｔ
こ合せて、最適の被破砕物が破砕機１１に供給さノする
よう供給コンベヤー２の速度を制御する。The control device 14 for the supply conveyor 12 is only for controlling the amount of material to be crushed, and is controlled by the control signal of the control device 13 for the crusher 11.
In addition, the speed of the supply conveyor 2 is controlled so that the optimum material to be crushed is supplied to the crusher 11.
さらに、ばら物１の粒度分布精度を向上させるためには
、コンベヤ２に計＃→１５と速度制御装色′１６を設け
て相Ｗに接続し、コンベヤ２の速度を割部ｊすることに
よりばら物１０層厚を均一化を図り、あるいは、計量機
１５と供給コンベヤー２川制ｊｉｌｊｌ装置１４とを接
続して、計駄信号により供給−１ンベヤ１２の速度を制
御して、コンベヤ２の運搬）１１°均一化を図る。この
場合、コンベヤ２の速１彰Ｖけ、ばら物１の粒子径ＩＩ
ｉを演算するだめのファクターであるから、コンベヤ
２の速度制御装置１６を粒度分布検知装置１０へ接続し
、演算部８へ変化するＶの（ｉｌＪを入力することが必
要である。Furthermore, in order to improve the particle size distribution accuracy of the bulk material 1, the conveyor 2 is provided with a total number → 15 and a speed control coloring '16, which are connected to the phase W, and the speed of the conveyor 2 is controlled by dividing the part j. The thickness of the 10 layers of bulk materials can be made uniform, or the weighing machine 15 and the supply conveyor two-way control device 14 can be connected, and the speed of the supply conveyor 12 can be controlled using a waste signal to control the speed of the conveyor 2. Transportation) 11° uniformity will be achieved. In this case, the speed of the conveyor 2 is 1, and the particle size of the bulk material 1 is
Since i is a necessary factor to calculate, it is necessary to connect the speed control device 16 of the conveyor 2 to the particle size distribution detection device 10 and input the (ilJ) of the changing V to the calculation section 8.
コンベヤ２の後段に、破砕機１１へばら物１を戻す循環
工程を設けて、粒度分布の検知結果により再循環を行う
こともで・きる。A circulation step for returning the bulk material 1 to the crusher 11 may be provided after the conveyor 2, and recirculation may be performed based on the detection result of the particle size distribution.
１
上述の如く、この発萌によれば、ばら物１の粒度分布を
、長時間を要せず、非接触で連続的に検知することがで
き、検知した粒度分布情報を直ちに生産工程にフィード
バックして粒度分布を高い精（７ｓｌで制御することか
可能であるから、石炭、鉱石、ベレット、々どの粒度を
均一、化し、生産品の品質を向上させる。1 As mentioned above, according to this development, the particle size distribution of bulk material 1 can be continuously detected without contact for a long time, and the detected particle size distribution information can be immediately fed back to the production process. Since it is possible to control the particle size distribution with high precision (7sl), the particle size of coal, ore, pellets, etc. can be made uniform and the quality of products can be improved.
第１図はこの発明の一実施例の構成を示す図、第２図は
光検知手段により得られる光度信号りを示す図、第３図
は比較部からの出力信号Ｌ１．Ｌ２を示す図、第４図は
粒度分布曲線を示す図でｆｆ）る、図中、１はばら物、
２はコンベヤ、３は検知ライン部、４は光照射器、５は
光検知器、６は変換器、７は比較部、８は演算部、９は
光源、１０は粒度分布検知装置である。
特許出願人 古河鉱業株式会社
代理人 弁理士 森 哲 也弁理士
内 藤 嘉 昭
弁理士 清 水 正
第１図
１６
第２図FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing the luminous intensity signal obtained by the photodetecting means, and FIG. 3 is a diagram showing the output signal L1. Figure 4 shows the particle size distribution curve. In the figure, 1 indicates loose material;
2 is a conveyor, 3 is a detection line section, 4 is a light irradiator, 5 is a photodetector, 6 is a converter, 7 is a comparison section, 8 is a calculation section, 9 is a light source, and 10 is a particle size distribution detection device. Patent applicant: Furukawa Mining Co., Ltd. Agent Patent attorney: Tetsuya Mori, patent attorney
Yoshiaki Naito, Patent Attorney Tadashi Shimizu Figure 1 16 Figure 2
Claims (2)
を照射する光照射器と、通過するばら物の粒子と粒子間
空隙とによって変化する前記検知ライン部からの反射光
を受光して光度を電気的信号として出力する光検知器と
、該光検知器に接続されておシその光検知器の出力する
光度信号を受けて粒度分布信号に変換する変換器とを具
備することを特徴とするばら物の粒度分布検知装置。(1) A light irradiator that irradiates a detection line section on a conveyor that conveys loose objects, and a light intensity that is determined by receiving the reflected light from the detection line section that changes depending on the particles of the loose objects passing through and the gaps between the particles. It is characterized by comprising a photodetector that outputs an electrical signal, and a converter connected to the photodetector that receives the luminous intensity signal output from the photodetector and converts it into a particle size distribution signal. Particle size distribution detection device for loose materials.
設定光度信号とを比較する比較部と、信号時間とコンベ
ヤ速度から粒度分布を演算する演算部とよシなることを
特徴とする特許請求の範囲第１、項記載のばら物の粒度
分布検知装置。(2) The converter is characterized in that it has a comparison section that compares the luminous intensity signal detected by the photodetector and a set luminous intensity signal, and a calculation section that computes the particle size distribution from the signal time and conveyor speed. An apparatus for detecting particle size distribution of loose materials according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56162343A JPS5862540A (en) | 1981-10-12 | 1981-10-12 | Device for detecting grain size distribution of loose material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56162343A JPS5862540A (en) | 1981-10-12 | 1981-10-12 | Device for detecting grain size distribution of loose material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5862540A true JPS5862540A (en) | 1983-04-14 |
Family
ID=15752745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56162343A Pending JPS5862540A (en) | 1981-10-12 | 1981-10-12 | Device for detecting grain size distribution of loose material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5862540A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2561386A1 (en) * | 1984-03-14 | 1985-09-20 | Svenska Traeforskningsinst | METHOD FOR OPTICALLY DETERMINING THE DISTRIBUTION OF LUMPERS IN A PIECE OF MATERIAL |
| FR2637983A1 (en) * | 1988-10-19 | 1990-04-20 | Rhone Poulenc Chimie | Method and installation for granulometric analysis of a material consisting of particles |
| JP2008046077A (en) * | 2006-08-21 | 2008-02-28 | Taiheiyo Cement Corp | Grain size measuring method |
| WO2023053239A1 (en) * | 2021-09-29 | 2023-04-06 | 日本電気株式会社 | Material estimation device, material estimation system, and material estimation method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56128443A (en) * | 1980-03-13 | 1981-10-07 | Nippon Kokan Kk <Nkk> | Grain size measuring method of granulous substance |
-
1981
- 1981-10-12 JP JP56162343A patent/JPS5862540A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56128443A (en) * | 1980-03-13 | 1981-10-07 | Nippon Kokan Kk <Nkk> | Grain size measuring method of granulous substance |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2561386A1 (en) * | 1984-03-14 | 1985-09-20 | Svenska Traeforskningsinst | METHOD FOR OPTICALLY DETERMINING THE DISTRIBUTION OF LUMPERS IN A PIECE OF MATERIAL |
| WO1985004249A1 (en) * | 1984-03-14 | 1985-09-26 | Svenska Träforskningsinstitutet | Method for measuring size distribution |
| JPS61500280A (en) * | 1984-03-14 | 1986-02-20 | スヴエンスカ・トレ−フオシユクニングスインステイチユテツト | Size distribution measurement method for bulk materials |
| FR2637983A1 (en) * | 1988-10-19 | 1990-04-20 | Rhone Poulenc Chimie | Method and installation for granulometric analysis of a material consisting of particles |
| JP2008046077A (en) * | 2006-08-21 | 2008-02-28 | Taiheiyo Cement Corp | Grain size measuring method |
| WO2023053239A1 (en) * | 2021-09-29 | 2023-04-06 | 日本電気株式会社 | Material estimation device, material estimation system, and material estimation method |
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