JPH0144100B2 - - Google Patents
Info
- Publication number
- JPH0144100B2 JPH0144100B2 JP3051585A JP3051585A JPH0144100B2 JP H0144100 B2 JPH0144100 B2 JP H0144100B2 JP 3051585 A JP3051585 A JP 3051585A JP 3051585 A JP3051585 A JP 3051585A JP H0144100 B2 JPH0144100 B2 JP H0144100B2
- Authority
- JP
- Japan
- Prior art keywords
- amount
- raw material
- coarse powder
- powder
- external circulation
- 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
Links
- 239000000843 powder Substances 0.000 claims description 93
- 239000002994 raw material Substances 0.000 claims description 60
- 238000000034 method Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 3
- 238000010298 pulverizing process Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003801 milling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Crushing And Grinding (AREA)
- Disintegrating Or Milling (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はセメント原料等の原料鉱石を粉砕して
その精粉を生成する原料ミルにおける粉砕制御方
法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grinding control method in a raw material mill that crushes raw material ore such as cement raw material to produce fine powder thereof.
セメントは、例えばローラ方式の原料ミルにて
セメント原料鉱石を粉砕し、その精粉として生成
される。第２図はこの種の原料ミルの概略構成と
その粉砕制御部の構成を示すもので、１はミル本
体である。原料Ａは、フイードタンク２から定量
供給機（CFW；Constant Feed Ware）３を介
してミル本体１に供給される。このミル本体１
は、例えば複数の圧下ローラ４と回転テーブル５
との間に供給される上記原料Ａを粉砕し、その粉
砕粉を上記回転テーブル５の外周部下方からガス
供給部６を介して吹上げ供給される高温ガスＧに
てミル内上方部に設けられたセパレータ７に導
き、精粉Ｂと粗粉Ｃとに分離している。このセパ
レータ７により分離された精粉Ｂは、上記ガスに
搬送されて外部に取出され、サイクロン８に供給
されて該ガスＧと分離されて排出（出力）され
る。また粗粉Ｃは、前記回転テーブル５上に落下
供給されて再度粉砕される。尚、前記ガスＧは上
記サイクロン８に接続された吸引フアン９によつ
て吸引されるもので、前記ミル本体１内からサイ
クロン８へと通流される。
Cement is produced as fine powder by pulverizing cement raw material ore in, for example, a roller-type raw material mill. FIG. 2 schematically shows the structure of this type of raw material mill and the structure of its crushing control section, and 1 is the mill main body. Raw material A is supplied from a feed tank 2 to a mill main body 1 via a constant feed ware (CFW) 3. This mill body 1
For example, a plurality of rolling down rollers 4 and a rotary table 5
The raw material A supplied between the mills is pulverized, and the pulverized powder is supplied to the upper part of the mill using high-temperature gas G which is blown up and supplied from below the outer periphery of the rotary table 5 through the gas supply section 6. The powder is introduced into a separator 7, where it is separated into fine powder B and coarse powder C. The fine powder B separated by the separator 7 is carried by the gas and taken out to the outside, supplied to the cyclone 8, separated from the gas G, and discharged (output). Further, the coarse powder C is dropped onto the rotary table 5 and is ground again. The gas G is sucked by a suction fan 9 connected to the cyclone 8, and is passed from inside the mill body 1 to the cyclone 8.
一方、前記回転テーブル５の外周からその周囲
に落下する粉砕残存物、つまり前記圧下ローラ４
と回転テーブル５とによつて粉砕されなかつた残
存原料Ｄは、粗粉ベルトコンベア１０を介してバ
ケツトエレベータ１１に供給されてミル本体１の
上部に導かれ、前記供給原料Ａに加えられてミル
本体１に再供給される。この粗粉ベルトコンベア
１０とバケツトエレベータ１１とからなる粗粉再
投入機構によつて外部循環されて再供給される粗
粉（残存原料Ｄ）の搬送量は、粗粉の外部循環量
と称され、前記バケツトエレベータ１１を駆動す
るモータ１２の駆動電力と対応付けられて検出さ
れる。 On the other hand, the crushed residue falling from the outer periphery of the rotary table 5 to the surrounding area, that is, the reduction roller 4
The remaining raw material D that has not been crushed by the rotary table 5 is supplied to the bucket elevator 11 via the coarse powder belt conveyor 10, guided to the upper part of the mill body 1, and added to the feed raw material A. The mill body 1 is re-supplied. The amount of coarse powder (residual raw material D) that is externally circulated and resupplied by the coarse powder re-feeding mechanism consisting of the coarse powder belt conveyor 10 and the bucket elevator 11 is called the external circulation amount of coarse powder. is detected in association with the drive power of the motor 12 that drives the bucket elevator 11.
しかして従来では、この粗粉の外部循環量が一
定値となるべく、例えば前記モータ１２から検出
される外部循環量Ｋとその制御設定値Ｓとの差を
差分器１３を介して求め、この差が零（０）とな
るように制御装置１４によつて前記定量供給機３
を制御している。即ち、前記粗粉の外部循環量Ｋ
が所定の設定値Ｓとなるように前記定量供給機３
を所謂PID演算制御して、前記原料Ａの供給量を
制御している。 However, conventionally, in order to keep the external circulation amount of this coarse powder constant, for example, the difference between the external circulation amount K detected from the motor 12 and its control setting value S is determined via a differentiator 13. The metering feeder 3 is controlled by the control device 14 so that the amount becomes zero (0).
is controlled. That is, the external circulation amount K of the coarse powder
is set to a predetermined set value S.
The supply amount of the raw material A is controlled by so-called PID calculation control.
ところでこのような構成の原料ミルにおける精
粉量、つまりサイクロン８から排出される精粉Ｂ
の量は、定常的には原料Ａの供給量に等しい。こ
れに対してミル本体１が実際に供給原料を粉砕す
る処理量は、前記フイードタンク２から供給され
る原料Ａと粗粉再投入機構を介して再供給される
粗粉Ｄとからなり、上記精粉量と異なつている。
ちなみに原料ミルにおける精粉性能は、例えば前
記原料Ａの供給量と前記粗粉Ｄの外部循環量との
比で示される循環率で評価される。また上記精粉
性能は、原料ミルの稼働に伴う圧下ローラ４の摩
耗の進行に伴う該圧下ローラ４の粉砕性能の低下
に大きく依存し、圧下ローラ４の粉砕性能が低下
するに従つて前記粗粉Ｄの外部循環量が増大す
る。そこで従来では、前述したように粗粉Ｄの外
部循環量を検出して原料Ａの供給量を調整し、そ
の精粉性能を高く維持した状態で、つまり圧下ロ
ーラ４と回転テーブル５との間に常に所定量の原
料（再供給される粗粉Ｄを含む）を供給して原料
ミル（ミル本体１）を稼働するようにしている。
また前記圧下ローラ４を定期的に交換する等し
て、その粉砕性能を確保するようにしている。 By the way, the amount of fine powder in a raw material mill with such a configuration, that is, the fine powder B discharged from cyclone 8
The amount of is constantly equal to the supply amount of raw material A. On the other hand, the throughput of the raw material actually pulverized by the mill main body 1 consists of the raw material A supplied from the feed tank 2 and the coarse powder D re-supplied via the coarse powder re-feeding mechanism, and The amount of powder differs.
Incidentally, the fine powder performance in the raw material mill is evaluated, for example, by the circulation rate shown by the ratio of the supply amount of the raw material A to the external circulation amount of the coarse powder D. In addition, the above-mentioned fine powder performance largely depends on the reduction in the pulverizing performance of the reduction roller 4 as the reduction roller 4 wears out due to the operation of the raw material mill. The amount of external circulation of powder D increases. Therefore, in the past, as described above, the amount of external circulation of the coarse powder D is detected and the supply amount of the raw material A is adjusted, and the fine powder performance is maintained at a high level. A predetermined amount of raw material (including the re-supplied coarse powder D) is always supplied to the mill to operate the raw material mill (mill main body 1).
In addition, the crushing performance is ensured by periodically exchanging the reduction roller 4.
ところで原料ミルを効率良く稼働するには、上
述した制御によつてその精粉性能を十分高く維持
すると共に、その精粉量を効果的に制御すること
が必要である。この精粉量の調整は、例えば前記
原料Ａの供給制御値、即ち外部循環量の設定値Ｓ
の可変設定によつて実現できる。ところが上記循
環量の設定値Ｓを高く設定し、前記圧下ローラ４
と回転テーブル５との間に供給する原料供給量を
多くする場合、その供給量が圧下ローラ４の処理
能力の限界に達すると粗粉Ｄの外部循環量が徒に
増大する。この結果、上記設定値Ｓを高く設定し
てもその精粉量の増大を図ることができなくな
る。つまり粗粉Ｄの外部循環量とその精粉量と
は、一般的に第３図に示すような関係を有してお
り、設定値Ｓの有効な調整範囲に限界がある。こ
れ故、前記設定値Ｓを可変して精粉量を調整する
場合、その設定値Ｓを所定値以下の範囲で調整す
るようにしている。ところが上記設定値Ｓを低く
して精粉量を少なくする場合、その外部循環量自
体が少なくなることから上述した制御を高精度に
行うことが困難となる。即ち、上述したように外
部循環量を前記バケツトエレベータ１１を駆動す
るモータ１２の駆動電力として間接的に検出して
いるので、粗粉Ｄの外部循環量が少なくなるとそ
の検出Ｓ／Ｎが悪くなる。この為、原料供給量制
御が不安定となり、前述した粉砕性能の維持が困
難となる。
By the way, in order to operate the raw material mill efficiently, it is necessary to maintain its fine powder performance at a sufficiently high level through the above-mentioned control and to effectively control the amount of the refined powder. This adjustment of the amount of refined powder is performed by, for example, the supply control value of the raw material A, that is, the set value S of the external circulation amount.
This can be achieved by variable settings. However, when the set value S of the circulation amount is set high, the reduction roller 4
When increasing the amount of raw material supplied between the rotary table 5 and the rotary table 5, if the amount of raw material supplied reaches the limit of the processing capacity of the reduction roller 4, the amount of external circulation of the coarse powder D will increase unnecessarily. As a result, even if the set value S is set high, the amount of refined powder cannot be increased. In other words, the amount of external circulation of the coarse powder D and the amount of fine powder thereof generally have a relationship as shown in FIG. 3, and there is a limit to the effective adjustment range of the set value S. Therefore, when adjusting the amount of refined powder by varying the set value S, the set value S is adjusted within a range of a predetermined value or less. However, when the set value S is lowered to reduce the amount of refined powder, the amount of external circulation itself decreases, making it difficult to perform the above-mentioned control with high precision. That is, as described above, since the amount of external circulation is indirectly detected as the driving power of the motor 12 that drives the bucket elevator 11, when the amount of external circulation of the coarse powder D decreases, the detection S/N deteriorates. Become. For this reason, control of the raw material supply amount becomes unstable, making it difficult to maintain the above-mentioned pulverization performance.
本発明はこのような不具合に鑑みてなされたも
ので、精粉性能の低下を招来することなしにその
精粉量を広範囲に亙つて制御することのできる原
料ミルの粉砕制御方法を提供することを目的とす
るものである。 The present invention has been made in view of these problems, and an object of the present invention is to provide a grinding control method for a raw material mill that can control the amount of fine powder over a wide range without causing a decrease in the fine powder performance. The purpose is to
本発明は、供給された原料を粉砕してその精粉
を出力すると共に、粗粉を外部循環させて再供給
する粗粉再投入機構を備えた原料ミルにおいて、
上記粗粉再投入機構における粗粉の外部循環量を
検出し、この外部循環量が所定値以下の場合に
は、前記原料ミルに供給されて前記精粉を搬送出
力するガスの供給圧力と排出圧力との差が所定値
となるように前記原料の供給量を制御する（第１
の制御モード）と共に、前記粗粉の外部循環量が
前記所定値を越える場合には、その外部循環量が
一定値となるように前記原料の供給量を制御する
（第２の制御モード）ようにしたことを特徴とす
るものである。つまり粗粉の外部循環量に応じて
原料の供給制御形態を上記第１の制御モードと第
２の制御モードとに切替えることによつて、原料
ミルにおける精粉性能を犠牲にすることなく、つ
まり精粉性能を常に高く維持した状態でその精粉
量を調整可能としたものである。
The present invention provides a raw material mill equipped with a coarse powder re-feeding mechanism that pulverizes the supplied raw material and outputs the refined powder, and also circulates the coarse powder externally and re-supplies it.
The amount of external circulation of coarse powder in the coarse powder re-feeding mechanism is detected, and if the amount of external circulation is less than a predetermined value, the supply pressure and discharge of the gas that is supplied to the raw material mill to convey and output the fine powder is determined. The supply amount of the raw material is controlled so that the difference from the pressure becomes a predetermined value (the first
control mode), and when the external circulation amount of the coarse powder exceeds the predetermined value, the supply amount of the raw material is controlled so that the external circulation amount becomes a constant value (second control mode). It is characterized by the following. In other words, by switching the feed control mode of the raw material between the first control mode and the second control mode according to the external circulation amount of coarse powder, it is possible to avoid sacrificing the fine powder performance in the raw material mill. This makes it possible to adjust the amount of fine powder while always maintaining high fine powder performance.
かくして本発明によれば、粗粉の外部循環量が
少ないとき、つまり圧下ローラの粉砕性能が高い
状態のときには、ミル本体内の負荷状態をその内
部に供給するガスの入口部と出口部との圧力差で
或る程度把握できることを利用して原料供給量を
制御するので、該圧下ローラによる粉砕性能（精
粉性能）が高いことと相俟つて原料の供給量を効
果的に制御することが可能となり、またその粉砕
量の調整を精度良く行うことが可能となる。また
圧下ローラの摩耗によつてその粉砕性能が低下し
たときには、従来と同様に粗粉の外部循環量に基
づく原料の供給量の制御を行うので、前述したよ
うにその粉砕性能を維持しつつ、その粉砕量を調
整することができる。
Thus, according to the present invention, when the amount of external circulation of coarse powder is small, that is, when the crushing performance of the reduction roller is high, the load inside the mill main body is determined by the difference between the inlet and outlet of the gas supplied to the inside of the mill body. Since the feed rate of raw materials is controlled by utilizing the fact that the pressure difference can be determined to a certain extent, the feed rate of raw materials can be effectively controlled due to the high crushing performance (fine powder performance) of the reduction roller. This makes it possible to precisely adjust the amount of pulverization. In addition, when the crushing performance of the reduction roller deteriorates due to wear, the amount of raw material supplied is controlled based on the external circulation amount of coarse powder, as in the past, so the crushing performance is maintained as described above. The amount of pulverization can be adjusted.
即ち、ミル内に供給されるガスは、粉砕生成さ
れた精粉を含んで排出される為、その供給ガス圧
力と排出ガス圧力とに差が生じ、その圧力差はお
おむね精粉量に依存する。従つて、この圧力差を
モニタすれば、その精粉量を或る程度把握するこ
とができる。しかして、圧下ローラを交換した後
の初期期間においては圧下ローラの摩耗は殆んど
なく、従つて粗粉の外部循環量に応じて原料供給
量を制御しなくても、その精粉性能を十分高いも
のとすることができる。しかもこのときの粗粉の
外部循環量は少ないので、仮にこれを検出して
も、その検出性能が低いことがら原料供給量の制
御に用いるには甚だ不十分である。これ故、上記
ガス圧力差に従つて原料の供給量を制御した方
が、より精度の高い精粉量制御が可能となること
になる。 That is, since the gas supplied into the mill is discharged containing fine powder produced by pulverization, a difference occurs between the supply gas pressure and the exhaust gas pressure, and the pressure difference roughly depends on the amount of fine powder. . Therefore, by monitoring this pressure difference, the amount of refined powder can be grasped to a certain extent. Therefore, in the initial period after replacing the reduction roller, there is almost no wear on the reduction roller, and therefore, the fine powder performance can be improved without controlling the raw material supply amount according to the external circulation amount of coarse powder. It can be made sufficiently high. Moreover, since the amount of coarse powder externally circulated at this time is small, even if it were detected, the detection performance would be low and it would be extremely insufficient to use it for controlling the amount of raw material supplied. Therefore, controlling the supply amount of the raw material according to the gas pressure difference enables more accurate control of the refined powder amount.
故に、粗粉再投入機構を介して検出される粗粉
の外部循環量に応じて、上述したように原料の供
給制御モードを切替え制御すれば、広範囲に亙つ
て安定に精粉量を調整することが可能となる等の
実用上多大なる効果が奏せられる。 Therefore, if the raw material supply control mode is switched and controlled as described above in accordance with the external circulation amount of coarse powder detected via the coarse powder re-feeding mechanism, the amount of fine powder can be stably adjusted over a wide range. This has great practical effects, such as making it possible to
以下、図面を参照して本発明に係る原料ミル粉
砕制御方法の一実施例につき説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the raw material mill pulverization control method according to the present invention will be described below with reference to the drawings.
第１図は一実施例方法を適用して構成される原
料ミルの概略構成と、その制御部の構成を示す図
である。尚、第２図に示す従来装置と同一部分に
は同一参照符号を付して示してある。 FIG. 1 is a diagram showing a schematic configuration of a raw material mill constructed by applying the method of an embodiment, and a configuration of its control section. Note that the same parts as those of the conventional device shown in FIG. 2 are designated with the same reference numerals.
しかしてこの実施例が特徴とするところは、ミ
ル本体１に供給するガスＧのガス導入部（入口
部）と、ミル本体１から排出されるガスＧの排出
部（出口部）にそれぞれ圧力計２１，２２を設
け、供給・排ガス圧力Ｘ，Ｙをそれぞれ検出する
ようにした点である。そして、その検出ガス圧力
Ｘ，Ｙを差分器２３に導いてその圧力差Ｚ（＝Ｙ
−Ｘ）を求め、この検出圧力差Ｚと圧力調整の設
定値（設定圧力値）Ｐとの差を差分器２４により
求めて制御装置２５に与え、上記検出ガス圧力差
Ｚがその設定値Ｐと等しくなるように前記定量供
給機（CFW）３を制御するようにしたものであ
る。 However, the feature of this embodiment is that pressure gauges are installed at the gas introduction part (inlet part) of the gas G supplied to the mill body 1 and the discharge part (exit part) of the gas G discharged from the mill body 1. 21 and 22 are provided to detect supply and exhaust gas pressures X and Y, respectively. Then, the detected gas pressures X and Y are guided to the differentiator 23 and the pressure difference Z (=Y
-X) is determined, and the difference between this detected pressure difference Z and the pressure adjustment set value (set pressure value) P is determined by the difference device 24 and is given to the control device 25, and the detected gas pressure difference Z is determined as the set value P. The quantitative feeder (CFW) 3 is controlled so that the amount is equal to .
このガス圧力による定量供給機３の制御系は、
前記粗粉の外部循環量に基づく定量供給機３の制
御系と並列的に設けられるもので、セレクタ２６
の切替え制御により、その制御ループに選択的に
挿入されるように構成されている。 The control system of the quantitative feeder 3 using this gas pressure is as follows:
It is provided in parallel with the control system of the quantitative feeder 3 based on the external circulation amount of the coarse powder, and the selector 26
is configured to be selectively inserted into the control loop by switching control.
このセレクタ２６を切替え制御する判定器２７
は、前記モータ１２の駆動電力から検出される粗
粉の外部循環量Ｋの情報に従つて、その循環量Ｋ
が所定の設定値Ｒより高いか低いかを判定するも
のである。具体的には、判定器２７はウインドコ
ンパレータ等によつて構成され、上記循環量Ｋの
値を２つの設定値RH、RLとヒステリシス的に比
較判定している。そして検出された循環量Ｋの値
が設定値RLより低くなつたとき、前記定量供給
機３に対する制御系をガス圧力に基づく制御系に
設定し、前述した如くミル本体１に入出力するガ
ス圧差Ｚに従つて定量供給機３の作動を制御し、
その原料供給量を制御するようにしている（第１
の制御モード）。 Determiner 27 that switches and controls this selector 26
is the circulating amount K of coarse powder according to the information on the external circulating amount K of the coarse powder detected from the driving power of the motor 12.
is higher or lower than a predetermined set value R. Specifically, the determiner 27 is constituted by a window comparator or the like, and compares and determines the value of the circulation amount K with two set values R H and R L in a hysteretic manner. When the detected value of the circulation amount K becomes lower than the set value R L , the control system for the quantitative feeder 3 is set to a control system based on gas pressure, and as described above, the gas input and output to the mill main body 1 is Controlling the operation of the quantitative feeder 3 according to the pressure difference Z,
We are trying to control the amount of raw materials supplied (first
control mode).
しかしてこの制御モードによつてミル本体１が
稼働し、前記圧下ローラ４の摩耗によつて粗粉の
外部循環量が増大してくると、これに伴つて検出
循環量Ｋの値が高くなつてくる。そしてこの循環
量Ｋの値が設定値RHを越えると、判定器２７は
これを検出して前記セレクタ２６を制御装置１３
側に切替える。この切替えによつて、上記検出ガ
ス圧力差に基づく制御系が定量供給機３から切離
され、代わりに前記前記粗粉の外部循環量に基づ
く制御系が定量供給機３の制御系として設定され
る。そして前述したように、その粗粉の外部循環
量Ｋが前記設定値Ｓとなるように原料供給量の制
御が行われる（第２の制御モード）。この制御系
による原料供給量の制御は、前記圧下ローラ４の
交換等による、定常状態における粗粉の外部循環
量が前記設定値RLより低くなるまで行われる
尚、この２つの設定値RH、RLによる制御モー
ドのヒステリシス特性を持たせた切替え制御は、
上記２つの制御モードの設定値Ｒ付近での不安定
な切替え遷移が生じないようにする為の配慮であ
る。従つて、上記２つの設定値RH、RLの幅は、
外部循環量Ｋの定常的な変動幅を見込んで設定し
ておけば十分である。 However, when the mill main body 1 is operated in the lever control mode and the external circulation amount of coarse powder increases due to wear of the reduction roller 4, the value of the detected circulation amount K increases accordingly. It's coming. When the value of the circulation amount K exceeds the set value R H , the determiner 27 detects this and switches the selector 26 to the control device 13.
Switch to the side. By this switching, the control system based on the detected gas pressure difference is separated from the quantitative feeder 3, and a control system based on the external circulation amount of the coarse powder is set as the control system for the quantitative feeder 3 instead. Ru. As described above, the raw material supply amount is controlled so that the external circulation amount K of the coarse powder becomes the set value S (second control mode). The raw material supply amount is controlled by this control system until the external circulation amount of coarse powder in a steady state becomes lower than the set value R L due to replacement of the reduction roller 4, etc. Note that these two set values R H , R L switching control with hysteresis characteristics of the control mode is as follows:
This is a consideration to prevent unstable switching transitions near the set value R of the two control modes. Therefore, the widths of the above two setting values R H and R L are as follows:
It is sufficient to set it in consideration of the constant fluctuation range of the external circulation amount K.
かくしてこのような制御方法によれば、圧下ロ
ーラ４の摩耗が少なく、その粗粉Ｄの外部循環量
Ｋが少ない状態であつても、前述したように検出
精度の悪い外部循環量に依存することなく、前記
ガス圧力差によつて原料供給量を制御するので、
ミル本体１による精粉量を効果的に制御すること
ができる。また精粉量を少なくする場合であつて
も、従来のように粗粉の外部循環量Ｋの制御設定
値Ｓを小さくするものとは異なるので、精粉量の
目安となる前記ガス圧力差に従つて、その原料供
給量を安定に、且つ精度良く制御して、精粉量を
制御することが可能となる。 Thus, according to such a control method, even if the reduction roller 4 has little wear and the external circulation amount K of the coarse powder D is small, there is no need to rely on the external circulation amount with poor detection accuracy as described above. Since the raw material supply amount is controlled by the gas pressure difference,
The amount of refined powder produced by the mill body 1 can be effectively controlled. Furthermore, even when reducing the amount of fine powder, this is different from reducing the control set value S of the external circulation amount K of coarse powder as in the past, so the gas pressure difference, which is a guideline for the amount of fine powder, is Therefore, it is possible to control the amount of refined powder by stably and accurately controlling the amount of raw material supplied.
そして圧下ローラ４の摩耗に伴つて粗粉の外部
循環量Ｋが増加した場合には、従来と同様にその
循環量に応じて原料供給量を制御するので、ミル
本体１の精粉性能を十分高く維持することが可能
となり、またこの精粉性能を高く維持した状態で
精粉量の調整を行うことが可能となる。 When the external circulation amount K of coarse powder increases due to wear of the reduction roller 4, the raw material supply amount is controlled according to the circulation amount as in the past, so that the fine powder performance of the mill body 1 is maintained sufficiently. It becomes possible to maintain a high level of fine powder, and it also becomes possible to adjust the amount of fine powder while maintaining this fine powder performance at a high level.
故に、圧下ローラ４の摩耗の度合に拘らず、原
料の供給量を安定に制御して、その精粉効率を高
くすることができ、且つ精粉効率を高く維持しな
がら精粉量を調整することが可能となる等の実用
上多大なる効果が奏せられる。 Therefore, regardless of the degree of wear of the reduction roller 4, the amount of raw material supplied can be stably controlled and the milling efficiency can be increased, and the amount of milled powder can be adjusted while maintaining the milling efficiency at a high level. This has great practical effects, such as making it possible to
尚、本発明方法は上述した実施例にのみ限定さ
れるものではない。例えば粗粉Ｄの外部循環量Ｋ
の検出法等は、原料ミルの、特に粗粉再投入機構
の仕様に応じた方式を採用すれば良いものであ
る。また上述した各制御系には、制御ループ補償
回路等が適宜設けられる場合もある。要するに本
発明はその要旨を逸脱しない範囲で種々変形して
実施することができる。 Note that the method of the present invention is not limited to the above-mentioned embodiments. For example, the external circulation amount K of coarse powder D
As for the detection method, etc., it is sufficient to adopt a method according to the specifications of the raw material mill, especially the coarse powder re-feeding mechanism. Further, each control system described above may be provided with a control loop compensation circuit or the like as appropriate. In short, the present invention can be implemented with various modifications without departing from the gist thereof.
第１図は本発明方法の一実施例を適用して構成
される原料ミルとその制御部の概略構成を示す
図、第２図は従来の原料ミルとその制御部の概略
構成を示す図、第３図は粗粉の外部循環量と精粉
量との関係を示す図である。
１…ミル本体、２…フイードタンク、３…定量
供給機、４…圧下ローラ、５…回転テーブル、６
…ガス供給部、７…セパレータ、８…サイクロ
ン、９…吸引フアン、１０…粗粉コンベア、１１
…バケツトエレベータ、１２…モータ、１３，２
３，２４…差分器、１４，２５…制御装置、２
１，２２…圧力計、２６…セレクタ、２７…判定
器。
FIG. 1 is a diagram showing a schematic configuration of a raw material mill and its control unit constructed by applying an embodiment of the method of the present invention, FIG. 2 is a diagram showing a schematic configuration of a conventional raw material mill and its control unit, FIG. 3 is a diagram showing the relationship between the amount of external circulation of coarse powder and the amount of fine powder. 1...Mill body, 2...Feed tank, 3...Quantitative feeder, 4...Reducing roller, 5...Rotary table, 6
...Gas supply unit, 7...Separator, 8...Cyclone, 9...Suction fan, 10...Coarse powder conveyor, 11
...Bucket elevator, 12...Motor, 13,2
3, 24...Differentiator, 14, 25...Control device, 2
1, 22...Pressure gauge, 26...Selector, 27...Judgment device.
Claims (1)
ると共に、粗粉を外部循環させて再供給する粗粉
再投入機構を備えた原料ミルにおいて、上記粗粉
の外部循環量を検出し、この外部循環量が所定値
以下の場合には、前記原料ミルに供給されて前記
精粉を搬送出力するガスの供給圧力と排出圧力と
の差が所定値となるように前記原料の供給量を制
御し、前記粗粉の外部循環量が前記所定値を越え
る場合には、その外部循環量が一定値となるよう
に前記原料の供給量を制御してなることを特徴と
する原料ミル粉砕制御方法。1. In a raw material mill equipped with a coarse powder re-feeding mechanism that pulverizes the supplied raw material and outputs the refined powder, and also circulates the coarse powder externally and re-supplies it, detects the external circulation amount of the coarse powder, If this external circulation amount is less than a predetermined value, the feed amount of the raw material is adjusted so that the difference between the supply pressure and discharge pressure of the gas supplied to the raw material mill to convey and output the refined powder becomes a predetermined value. raw material mill grinding control, characterized in that the supply amount of the raw material is controlled such that when the external circulation amount of the coarse powder exceeds the predetermined value, the external circulation amount becomes a constant value. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3051585A JPS61192357A (en) | 1985-02-20 | 1985-02-20 | Raw-material mill crushing control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3051585A JPS61192357A (en) | 1985-02-20 | 1985-02-20 | Raw-material mill crushing control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61192357A JPS61192357A (en) | 1986-08-26 |
| JPH0144100B2 true JPH0144100B2 (en) | 1989-09-26 |
Family
ID=12305943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3051585A Granted JPS61192357A (en) | 1985-02-20 | 1985-02-20 | Raw-material mill crushing control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61192357A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7615796B2 (en) * | 2021-03-18 | 2025-01-17 | Ｕｂｅマシナリー株式会社 | Vertical crusher and method for diagnosing crushing rollers thereof |
-
1985
- 1985-02-20 JP JP3051585A patent/JPS61192357A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61192357A (en) | 1986-08-26 |
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