DE1607483A1 - Grinding and classifying plant, especially for cement - Google Patents

Description

Patent attorney
Berlin 28 (Frohnau) J gg £ p

E s c h e r Wyes Aktiengesellschaft, Zurich (Switzerland)

Milling and sifting plant, especially for cement.

i The invention relates to a grinding and classifying system,

especially for cement, with at least one mill and at least two classifiers, at least one of which is connected to the closed circuit of this mill.

Systems for grinding and sifting cement are known, in which two in the closed circuit one Mill-connected classifiers are connected in series with each other on the fines side, in which the fines discharge is called of the first sifter in the direction of stripping of the classifier3 is connected to the classifier task of the second classifier. While the semolina discharges from both classifiers with the regrind feed connected to the mill. Such systems are zuiu Producing a single type of cement at a time, and experts believe that Production of different types of cement in a given plant is not being used to good advantage.

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10/24/66-Schy / bu
Z.No. 5 470 866/7

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The invention aims to provide a grinding and classifying system create with which cement types of different subtleties, can be produced with essentially the same advantageous utilization of the system. For this purpose, a grinding and Sight system of the type described at the outset according to the invention designed in such a way that connecting lines and actuatable closing organs are provided, which make it possible at least to connect two classifiers either in series or in parallel for the fine material side.

In the drawing, exemplary embodiments of the invention are shown in a simplified form. Show it: Fig. 1 is a scheme of a plant with a mill and two classifiers,

2 shows another embodiment of the plant according to Pig _t 1, FIG. 3 shows a plant with two mills and three classifiers, and FIG. 4 shows a plant with two mills and four classifiers, corresponding parts having the same reference numerals in all figures.

The system shown in FIG. 1 has a mill 1 and two classifiers 2, 3. With 4 the Mahlgutaufgäbe is designated. A bucket elevator 5 leads from the grinding material discharge of the mill 1 via a 'classifying material line 6 with two strands 6', 6 " to the Sichtgutaufgäbeη the classifier 2, 3. The semolina discharges the separators 2, 3 are connected to the grist via semolina lines 7

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_ 3 -

tasks 4 connected. The separators 2, 3 are thus switched into the closed circuit of the mill 1. The fine material discharges of the separators 2, 3 are each connected to a branch 8 'or 8 "of a debris line 8. The branch 8 ^{1 of} the debris line 8 has a switchover flap 9, the input of this switchover flap with the section of the strand S ¹ and an output of this switchover flap 9 is connected to a connecting line 10 which opens into the sifting material feed of the sifter 3. The sifter 2 is arranged above the sifter 3 so that the material flows in the connecting line 10 under the action of gravity "the cut-off line 6 has a shut-off valve 11 switched on.

The system shown works as follows. Both The positions of the flaps 9 »11 shown in the drawing are the classifiers 2 * 3 on the fine material side, and also the material side, connected in parallel. The cut material coming from the bucket elevator 5 passes through the strands 6 'and 6 "of the cut material line 6 in the classifying goods tasks of the classifier 2, 3 »and the peing material flows from the debris discharges of the classifier 2, 3 via the strands 8 'and 8 "into the debris pipe 8, while the semolina out the semolina discharge of the classifiers 2, 3 via the semolina lines 7 returns to the Mahlgutaufgäbe 4.

The mode of operation of the system for those in the drawing

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The opposite positions of the flaps 9 «11 shown in FIG. 2 can be seen in Pig. The system shown in FIG. 2 differs from that according to FIG. 1 only in that the separators 2, 3 are mounted at the same height and that a bucket elevator 12 is connected to the connecting line IO. At the one in the Pig. The position of the flaps 9, 11 shown in FIG. 2 passes the classifying material coming from the bucket elevator 5 via the line 6 ^{1 of} the classifying material line 6 in its entirety into the classifier 2, and the closed shut-off flap 11 prevents classifying material from entering the classifier 3. The peing material withdrawn from the classifier 2 is conveyed through the switchover flap 9 in the position shown in the drawing via the connecting line IO and the bucket elevator 12 to the classifying material entry of the classifier 3, 'and the peing material line 8 receives peing material exclusively from its line 8 " the sifter 3. As in the plant according to Pig. L, the grit discharges lead via the grit lines 7 to the grist feed 4. The sifters 2, 3 are thus in the position of the flaps 9, 11 shown in Pig Visible side, connected in series.

If the classifiers 2, 3 are connected in parallel on the fine material side, a cement of normal grain size, for example normal cement of about 2500 Blaine, is produced. By influencing $ _{& χ} . Peinheitsregulierung can be a special cement

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manufactured by e.g. 4,5OO Blaine. Much higher However, subtleties cannot generally be achieved in this way. With fine material-side series connection of the classifier 2, 3, on the other hand, is made using the known effect, that the fineness of the fine goods depends heavily on the fineness of the Task depends. Cement of even higher fineness, for example a super cement made by 6000 Blaine.

With the measures according to the invention, one obtains a Grinding and sifting system, with which cement types of different fineness with essentially the same advantageous Utilization of the plant can be established.

In series operation, the classifier 2 is more heavily loaded than in parallel operation. This fact can be taken into account in that the sifter 2 is dimensioned larger than the sifter 3. The branching piece of the strands 6 ', 6 "of the sifted material line is then designed so that in the said strands different sizes, corresponding uen dimensions of the sifter Partial flows flow.

The system shown in Fig. 3 has in addition to the parts of Plant according to FIG. 2 still has a coarse mill 13, which via a bucket elevator 14 ait the classifying material task of a third classifier 15 is connected, the fine material discharge via a fine material line 16 between the fine material discharge of the classifier 2 and the switchover flap 9 in the line 8 'of the fine material line 8-

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flows out, and its semolina discharge via a semolina line opens into the grinding stock feed 4 of the mill 1. The third sifter 15 is therefore parallel to the sifter 2 on the fine material side switched, but not switched into the closed circuit of mill 1. With fine material side parallel connection the classifier 2, 3t that is to say in the positions shown opposite positions of the flaps 9t 11 is the Classifier 15 fines side both to the classifier 2 and to Classifier 3 connected in parallel. With fine-material series connection the classifier 2, 3t so in the case of the one in the drawing The illustrated positions of the flaps 9 »11 is the sifter 15 on the fine material side parallel to classifier 2 and to classifier 3 connected in series.

The plant according to Pig. 4 has four separators, namely two separators 24 in addition to the separators 2, 3. These are to one another connected in parallel on all sides, they could therefore also be replaced by a single larger sifter, however, the use of a total of four identical classifiers is preferable because of the spare parts storage. The sifter 24, 24 are understood below, in particular also in the claims, as a single sifter 24.

The debris discharges from the classifier 2, 24 can be switched by switching flaps 29, 49 either via the line ¹ , 48 with the debris line 8 or via the connecting lines 10, 110

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be connected to the puss of a third "bucket elevator 112, the head of which opens via fine line *" 1 "iii the material entry of the classifier" 3, the fine material output of which is connected to the fine material line 8. Dieι semolina discharges-all classifiers lead to ' Mahlgutaufgäbe 4 derMühle1. ' ^f = · In the opposite positions of the flaps 11, 29, 4? The classifiers 2, 3 are switched on to ^{the mill 1 and the classifier 24 is switched on:} the closed circuit of the mill 1 is switched on 11, 29, 49 and the bucket elevator 112 are, in the direction of flow of the material to be classified, the classifiers 2, 3 and the classifiers 24-3 are finely connected in series with one another;

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Classifier 2 upstream of mill 1 and classifier 3, 24 are switched on in the closed circuit of mill 1. With this circuit, a 2-element of the highest fineness is achieved manufactured". ' : ; : ....

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Claims (5)

Claims 1. Grinding and classifying plant, in particular for cement, with at least one mill and at least two classifiers, at least one of which is connected to the closed circuit of the mill, characterized in that connecting lines (6 · \ 8 ¹ , 10 or 6 ", 8 ·, 10, 48, 110) and actuatable closing elements (9, 11 or 11, 29, 49) are provided, which make it possible to selectively use at least two classifiers (2, 3 or 2, 3, 24) to be connected in parallel or in series with one another on the fine material side. 2. Device according to claim 1, characterized in that that the mill (1) is preceded by a coarse mill (13) (Figures 3, 4). 3. Device according to claim 1, characterized in that that two classifiers (2, 3) in the closed circuit (1, 2, 3) of the mill (l) are switched on (Pig. I to 3). 4. Device according to claim 3, characterized in that that the sifter in Direction of flow of the material to be classified a second classifier is smaller than the first. 5. Device according to claims 2 and 3, characterized in that that the cool (l) is preceded by a sifter (15), which is connected to the first in the flow direction of the sifted material Pt. V 32
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Z.No. 5 470 866/7 909836/07 54 Classifier (2) of the closed circuit. (1, 2, 3) of the mill (1) on the fines side is connected in parallel, and the • to the second .Sitter .. (.- 3.) - Äes ^ e closed en Krerislaufeq ,. , .. (1, .2, 3.) P.arall al SjC attitude d, er _: If he sees (2, 3) dea circuit a.Xl, 2 », .3) parallel, and with fine goods £ .it iger“ series connection, this one. Sight he (2, -3X .au- dieaexa ..._ .second Sachter X 3) ■ -fine since4.gr ·. in. series kept ;,. .'s (Fig.- 3) · - / - "·. '· - · ■.-..- .. · ..; .. - · ■ _-; ι- ■ ·.-.... . ■;. '"-, - ■ · -' ■ - ■■ '■': ■■ - 6. ti device; naeii P, at: entans.pr.uch. _; 2,.-By. .gekennzeic _; | i.net,. that one of the. Mill,. (I) - -yx> rgeac hai t _ä et; er; Classifier {2) una in the closed circle.-la.Uff the .iVlühle ¹ ICl); , eangeacha ^ lteter classifier .. (24) -, .. ap, like. a -weitjerer .Sicht.er- _(3): provided ic3t, · der.-wahlwe-ise;, defli dferi ^ lvhie (LX vprge-switched, separator (2) feingutseitig parallel or dem _classifier;. .. (24) en, 3 .Kreislaufes of, _-MühjLe; (1 "), fe, -ingut3ijitig: nachgebehalvtet and, - so that in the X · .Kreislauf Iv 2'k or, l ·... «; 24.v 3). der,, mill ■ XlO. can-be-switched on. X Fig. »; 4 -)> * !. ν -.> -_ :, ■ ";' . ',;) Pt, V 3?
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Z, no. b 470 866/7 ■ ■ ■. . 8 38/07 Si; ^? - ^ ¹ -