EP2726208A2 - Method and device for producing flour and/or semolina - Google Patents

Abstract

The invention relates to a method for producing flour and/or semolina from material, the material being fed from a fill (6) into a feed opening of a roller press (9). The milling gap (d) of the roller press (9) is fixed, or damping of at least one of the rollers with respect to the lateral deflection is set, such that a first subset of the fill containing finer milling material (5) forms a packed particle fill in the milling gap (d). In addition, the setting is carried out in such a way that individual particles of a second subset of the fill containing coarser milling material (7) are in contact with the first roller (10) and the second roller (11) of the roller press (9). Subsequently, the bulk material is milled into milled product (17) in the roller press (9) and the milled product (17) is discharged through a discharge opening.

Description

Method and device for the production of flour and / or semolina

The present invention relates to a process for the production of flour and / or semolina and to a high-bed roller mill and the use thereof according to the preambles of the independent claims.

Methods and apparatus for making flour and / or semolina are known per se. For example, from EP 0 335 925 B1 discloses a method and an apparatus for producing milled cereal products such. As flour, semolina or haze known on the principle of high milling. The millbase is often roll-milled and repeatedly sieved. In this case, a material to be ground is guided over double-roller grinding stages, wherein the material to be ground is guided over at least two such grinding stages and without you ^¬ exercise is performed between the individual stages and is then viewed in each case at the Doppelvermahlung.

However, such devices have the disadvantage that the expenditure on equipment is very great due to the necessity of several grinding stages, which is costly. In addition, the use of multiple grinders means that large buildings are not ^necessary for the mill, which ^further increases the cost of constructing a mill.

From DE 1757093 AI a roll mill for fine grinding of brittle well known, wherein a nip width is adjusted in dependence on the Good ^¬ task and a required for crushing pressing force of the rollers is larger than the grain size of the essential part of the feed material.

From WO 2010/000811 Al a process for the production of flour and / or semolina is known in which a good bed roller mill is used with a variable gap. The nip sets depending on the amount and type of mäh ^¬ loin crop grain and the set pressure exerted on the rollers in the direction of the nip, a.

However, this prior art method and the corresponding device have the disadvantage that larger particles are not reliably ground in the material to be ground and it may come to vibrations of the rollers due to the processed material to be processed, which often includes particles in the size of the nip. In addition, heat is hardly added to the material to be ground in such high-bed roller mills, which is desirable in the production of certain types of flour, however.

It is therefore an object of the present invention to avoid the disadvantages of the known, in particular to provide a method and an apparatus with which flour from a regrind containing finer and coarser millbase can be reliably produced. Another object of the present invention is also to provide an apparatus and a method with which good flour is inexpensive and energy Güns ^¬ tig produced, wherein in particular, enough heat is supplied into the flour during the grinding.

These objects are achieved by a method and a device according to the independent claims.

The inventive method for producing flour and / or semolina from good, in particular cereals, cocoa, sunflower seeds and rice or any combination thereof, thereby comprises the following steps: Good is fed from a bed in a feed opening of a bed of high-quality rollers. The Gutbettwalzen ^¬ mill comprises a first roller and a second roller, wherein least one of the two rollers is supported in a direction substantially perpendicular to the direction of rotation of one of the two rollers movable for setting a grinding gap between the at ^¬ the rollers. In addition, a damping is adjustable with respect to a deflection in the direction in which the roller is movably mounted, and / or the grinding gap is fixed. The bed consists of particles with a size distribution and comprises in particular one of the following types or mixtures thereof: good, semolina, shell parts. In a further step, which can also be carried out before the above step, the grinding gap is fixed or the damping is set, so that a first subset of the bed containing finer millbase forms a packed particle bed in the grinding gap. For ^¬ the setting is made such that individual particles of a second subset of the bed containing coarser millbase are in contact with the first roll and the second roll of the high-pressure bed mill. Subsequently, a mowing ^¬ len of the bulk material in the high-bed roller mill in ground product. An ^¬ closing of the grinding a discharging the Mahlpro ^¬ domestic product through a discharge opening takes place.

For the purposes of the present application, cereals, ka ^cocoa , sunflower seeds and rice or any combinations thereof are understood as good.

Bread wheat, durum wheat, corn and buckwheat or any combinations thereof are preferably used as cereals in the process according to the invention.

In particular, a pressure in the direction of the grinding gap on the rollers is preset and / or adjustable, for example in conjunction with the damping. For the purposes of the present application, a good-bed roller mill is understood to mean such a roller mill, in which a crop bed is formed in the catchment area between the rollers, when the good-bed roller mill consists of an oversupply of good, e.g. B. by means of a filled material shaft or funnel, this eingie ^¬ hen. The fine bed comminution is based on the finer ground material on a packed particle bed in the grinding gap.

In the sense of the present application, a direction of rotation is understood to be the vector perpendicular to the plane of rotation in the mathematical sense.

Under an attenuation with respect to a deflection in the direction in which the roller is movably supported, in the sense of he signs ahead ^¬ a damper for suppressing vibrations is understood as possible, for example, shock absorbers or controllable hydraulic and / or pneumatic attenuations is, preferably hydraulic damping is ^¬ sets.

The use of such adjustable damping with respect to the deflection is particularly advantageous when a force-controlled roller mill is used in the example ^¬ example, mechanically biased springs or hydraulically coupled gas pressure accumulator are used to generate force and a pressure on the rollers in the direction of the refining gap is exerted. In such an embodiment, yes, a Mahlspalt between these rollers forms depending on the amount and type of material to be ground in the grinding gap and the set

Print. Due to variations in the composition of the ground material or by a certain proportion of coarser material to be ground, which is in contact with both rolls, the good bed roller mill can be vibrated, for example. These vibrations can now be reduced with the adjustable damping or even completely suppressed.

When using a fixed grinding gap is preferably dispensed with a damping, since here the rollers are locked zuein ^¬ other and thus can not be set in vibration.

For the purposes of the present application, a size distribution of particles, in particular ground material, is understood to mean the distribution of the largest dimension of the particles of the ground material.

For the purposes of the present application, a grinding gap is understood to mean the gap between the two rolls and, in particular, the smallest roll spacing during operation of the good-bed roll mill, whereby only the area of the rolls is taken into account which, during normal use, is in contact with the ground material during operation.

The inventive method has now that the finer ground material is ground in a Gutbettsituation and also the coarser material to be ground is also ground and insbeson ^¬ particular is highly stressed, so that the coarser material to be ground is already strongly crushed already by means of a run the advantage. As a result, the use of multiple grinding stages is largely avoided, in particular, the highest possible energy efficiency of the grinding is achieved.

Preferably, the first roller and the second roller with un ^¬ terschiedlicher speed rotating. In particular, the Geschwin ^¬ digkeitsverhältnis is greater than 1.1: 1 and more particularly greater than 2: 1. This has the advantage that the ground material is more efficient vermäh ^¬ len, since especially larger shear forces in the ground material occur when operating at different speeds.

A further advantage is that the size adjustment of the speed ratio, that is, the speed ratio ^¬ ses, the rollers is an additional parameter to optimize the milling process for the production of flour and that the process can be better optimized. In addition, thereby a smaller pressure in the grinding gap can be used, since the grinding is supported by the particular greater shear forces due to the different speeds ^¬ different rollers. This leads to smaller pressures and thus to better solubility for further separation of the meal product after milling.

For the purposes of the present application, the speed at which a roller rotates is understood to mean the speed of the roller surface in the tangential direction.

Particularly preferably, one of the two rollers is at least formed as Pro ^¬ filwalze. The profiled roller has, in particular, a section-wise recess in the roller surface, in particular ^¬ substantially parallel to the longitudinal axis of the respective roller.

For the purposes of the present application, the surface of the roll is understood to mean the surface which is located radially furthest apart from the longitudinal axis, whereby only the part in contact with the material to be ground in use is taken into account when used as intended. This has the advantage that a small grinding gap is adjustable for reliable grinding of the coarser material to be ground, which is thereby more stressed and therefore more ground. At least in the section-wise recesses forms a Gutbettsituation between the rollers, in which also the smaller particles are reliably ground in a packed particle bed.

Most preferably, the profile of the profiled roller in ^¬ We sentlichen is designed to be self-cleaning, in particular at least during the rotation of the profiled roller.

For the purposes of the present application, "self-cleaning" is understood to mean that, at least during the rotation, that is to say during operation of the rolls, ground material does not remain in the section-wise depressions but reliably falls out of them and can be further processed in the downstream devices.

This self-cleaning embodiment of the recesses in sections has the advantage that the collection of ground material in the bed of high-quality roller can be done permanently reliable in operation, which is often not the case with non-self-cleaning sections.

The self-cleaning configuration of the section-wise depressions can be achieved by selecting the geometry of the section-wise depressions and / or by selecting the corresponding surface roughness.

After the grinding of the ground material, the ground product is preferably conveyed to a separation stage for separation into fine particles. res ground product and coarser ground product. In particular, the coarser ground product is conveyed back into the feed opening.

Such separation steps such as zig-zag sifter, semolina cleaning machines, plansifter, turbo classifier, Streutellersich- ter or sifter are known from the prior art, beschrie ^¬ ben for example in WO 2010/000811 A2.

For example, zig-zag separators separate the product into a finer product and a coarser product due to the different specific gravity and / or the size of the particles in the product.

Plansifter separate, for example, to separierendes product into finer and coarser product product by means of sieving in ^¬ We sentlichen due to the size of the particles in the product.

This separation of the ground product into finer and coarser meal ^¬ product has the advantage that the respective fractions can be supplied to various uses. The return of the coarser millbase into the feed opening of the good bed roller mill has the advantage that the system can be operated in circulation operation and thus the number of good bed roller mills or other grinding stages can be reduced, resulting in cost savings and energy savings.

Particularly preferably, the separation stage is a further Gutbettwal ^¬ zenmühle downstream for further grinding of the finer meal product.

This has the advantage that the further good-bed roller mill for the optimal grinding of the finer ground product other Prozesspa- may have parameters such as the speed of the rollers or the Mahlspalts.

Another aspect of the present invention is directed to a good bed roller mill for performing a method as described above. This material bed roller mill comprising a first roller and a second roller, wherein at least one of the two Wal ^¬ zen is designed as a profiled roller with at least one cut from ^¬ have recess in the roll surface. These sections recess is particularly formed substantially paral lel to the longitudinal axis of the profile ^¬ roller. The section ^¬ wise depression is self-cleaning at least during rotation of the profile roller.

As explained above, the self-cleaning egg ^¬ genschaft the segmental recess by the geometric configuration and / or by the surface properties of the segmental recess is achieved.

As explained above, this has the advantage that, even when using a profiled roller, the feed of ground material into the grinding gap during operation is permanently reliable.

Preferably, the recess extends to sections ^¬ least over the entire length of the profile roller, which is in contact with the intended purpose according to use with the ground material. In other words, the section-wise depression in the circumferential direction is formed as a section-wise depression.

To set a grinding gap between is preferably stored at ^¬ the rolls during operation, at least one of the two rollers in a direction substantially perpendicular to the direction of rotation of one of the two rollers movable. An attenuation with respect to ner deflection in the direction in which the roller is movably mounted, is adjustable and / or the grinding gap is fixed a ^¬ adjustable.

For the purposes of the present application, a fixed SET ^¬ development of the refining gap means infinite attenuation, since firmly ^¬ stelltem grinding gap no vibrations of the rolls are possible to one another at intended use substantially.

Particularly preferably, at least a sectionwise Vertie ^¬ tion in the circumferential direction of the roll profile on average has a width in the range of 0.5 mm to 20 mm. In particular, this width is on average in the range of 2 mm to 10 mm and more particularly in the range of 4 mm to 6 mm.

In the context of the present application, the mean of the width is the mean value of the width along the longitudinal direction, i. H. the longest extent of the sectional depression, understood.

Most preferably, the at least one abschnittswei ^¬ se recess of the profiled roller in the radial direction of the roll in the middle to a depth in the range of 0.3 mm to 10 mm. Preferably, the depth is in the range of 0.5 mm to 5 mm and particularly be ^¬ vorzugt of 0.7 mm to 1.8 mm.

For the purposes of the present application, the mean of a depth of the section-wise depression is understood to be the mean value of the lowest point along the greatest extent of the sectional depression.

Preferably, the roll surface at least one cut from ^¬ have recess of the profiled roller with the intermediate in a section On the other hand, the roll surface and the surface of the groove which intersects the roll surface have an average internal angle of 100 ° to 170 °. The roll surface with the at least one section-wise depression preferably encloses an angle of 120 ° to 150 ° and particularly preferably of 130 ° to 140 °.

For the purposes of the present application, an internal angle means an angle on the inside of the roller surface facing the longitudinal axis of the profiled roller, in a sectional plane perpendicular to the longitudinal axis.

Under a middle of an interior angle of a mean value along a portion between the roller surface and the segmental recess is understood in the sense of constricting vorlie ^¬ application.

This embodiment as described above with respect to one of the parameters width, depth and interior angles or combinations thereof, has the advantage that the sections of the recess is to ^¬ least during rotation of the profiled roller self-cleaning, where ^¬ can be effected by the operation of reliable long term and ^¬ the expensive cleaning devices, which are expensive, are not needed.

Particularly preferably, the profile roller has at least two circumferentially spaced apart, Vertie ^¬ tions on. These section-wise recesses spaced apart in the circumferential direction have a mean distance in the range from 0.15 mm to 10 mm, preferably from 0.15 mm to 5 mm and particularly preferably from 0.15 mm to 0.5 mm.

Below the mean distance between the section-wise depressions, the mean distance along the longest extension understood the section-wise depression, wherein the distance between the two mutually facing sides of the sectional depressions is determined.

This refinement with at least two sections-wise depressions has the advantage that the grinding of the coarser millbase on the roll surface is reliable and a good bed situation in the depressions can arise for the grinding of the finer millbase.

Most preferably, the section-wise depression of the profile roller on a flat surface portion. Preferably, this surface portion is arranged substantially perpendicular to the radius of the profile roller.

Under a flat surface portion are understood not curved or bent surface portions within the meaning of vorlie ^¬ constricting registration, but also such a surface portion with a conventional surface roughness and / or Be ^¬ drove damage usually occurring as example ^¬ as scratches than just true.

This has the advantage of further improving the self-cleaning of the section-wise depression.

Preferably, the first roller and / or the second roller of the good bed roller mill has a diameter in the range of 400 mm to 1000 mm, and preferably from 600 mm to 800 mm.

This large diameter, in contrast to conventional roll mills, has the advantage that the product feed is improved. Another aspect of the present invention is directed to the use of a good bed roller mill as described above for making flours and / or gravies from cereals, cocoa, sunflower seeds and rice or any combinations thereof according to the method described above.

This use has the advantages described above.

An additional aspect of the present invention is directed to a good bed roller mill having a first roller and a second roller, at least one of the two rollers being movably supported in a direction substantially perpendicular to the direction of rotation of one of the two rollers for adjusting a grinding gap between the two rollers, and wherein a damping be ^¬ delay of a deflection in the direction in which the roller is movably mounted, is adjustable and / or the grinding gap is fixed.

The alternative good bed roller mill can in particular be combined with the embodiments disclosed for this good bed roller mill.

Another aspect of the present invention relates to a surface segment for forming a particular profiled roll surface of a roll. In particular, a roll for a good bed roll mill is formed as described above. The upper ^surface segment can be detachably fastened to a roller body to form the roller by means of a fastening means. In circumferential direction of the roller body environmental übestreicht the Oberflächenseg ^¬ ment an angular range of 22 ° to 90 °, preferably from 30 ° to 45 ° and particularly preferably of 32 ° to 40 °. The modular structure of the roller of a roller body and surface segments has the advantage that the surface segments serve as wear parts that are inexpensive and easy to replace. In addition, the surface segments have the advantage that, depending on the diameter of the roll body, the swept angle range through the Oberflä ^¬ chensegmente is selectable, so that the surface segments are easily handled by the appropriate size and not too heavy.

In particular, the roll comprising surface segments and roll bodies is usable as the first roll and / or the second roll in a bedroll mill as described above.

Preferably, the surface segment in cross section in Wesentli ^¬ Chen ring-shaped.

Under the cross section through a surface segment is understood vorlie ^¬ ing that the Schnift in accordance with regulations

Use of the surface segment is perpendicular to the longitudinal axis of the roller.

Ring segment-shaped surface segments have the advantage that less material is used for the production of the surface segments, which makes the surface segments cheaper and easier, which facilitates the handling, especially in Mon ^¬ days or disassembly.

More preferably, the surface segment, is operatively connected with a Drehmo ^¬ ment transmitting means, such that a torque of the roller body to the surface segment on ^¬ is portable. A "torque transmitting device" is meant a device of this type in the sense of the present application, that the force exerted in operation on the roll body Drehmo ^¬ element is reliably transferred to drive the roller to the Oberflächenseg ^¬ elements, so that the surface segments Be ^¬ drove not unintentionally be released from the roller body through the passing on ^¬ operating forces. Usually the upper ^¬ surface segments are attached with form of a helical Befestigungsmit ^¬ stuffs to the roller body, but the screws may can not be made sufficiently stable, so that in occurring large shear forces In operation, surface segments can be detached, which is to be avoided, and an additional torque transmission device leads in such a case to a more reliable and thus more cost-effective operation.

Most preferably, the surface segment on the side facing the roller body has a surface segment groove for engagement with the torque transmission device.

This has the advantage that a reliable transmission of the torque from the roller body to the surface segment is made possible by the intervention of the torque ^¬ transmission device in the Oberflächensegmentnut, since the surface for the Wirk ^¬ connection between roller body and surface segment for torque transmission is increased, which overloads avoids and therefore makes the operation more reliable.

With particular preference, the surface segment groove runs essentially parallel to the longitudinal axis of the roller. This has the advantage of further reduction of punctual peak loads on the surface ^segment , whereby the Be ^¬ drive is more reliable.

An additional aspect of the present invention relates to a set comprising surface segments as described above for forming a closed roll surface of a roll. The set comprises 4 to 16, preferably 8 to 12, particularly preferably 9 to 11 and very particularly preferably 10 surface segments.

For the purposes of the present application, the formation of a "closed" roller surface of a roller is understood to mean a surface formed substantially in the circumferential direction without interruption of the roller surface, in other words in the region of the roller which comes into contact with good when used as intended Roller body completely covered by upper ^¬ surface segments.

The set preferably comprises a torque transmission device between the roller body and the surface segment. In particular the set ^¬ holds the same number of torque transmitting devices such as surface segments. In particular, the torque transmission device is configured as a rod for engaging in a surface segment groove of the surface segment, wherein the rod is preferably at least sectionally angular in cross section and in particular wedge-shaped or rectangular.

Another aspect of the present invention relates to a roller comprising at least one surface ^segment as described above and a roller body. The surface segment is releasable by means of a fastener to the roll body be ^¬ solidifies. The roller comprises a torque transfer device Device for torque transmission from the roll body to the surface segment.

The roller body preferably has a roller groove in which the torque transmission device can be detachably fastened.

This has the advantage of reliably transferring the torque from the roll body to the torque transfer device while avoiding the generation of punctiform peak loads, making the operation of the roll more reliable.

Particularly preferably, the torque transmission device is designed as a rod for simultaneous engagement in the roller groove and a Oberflächensegmentnut the surface segment.

Most preferably, the rod in cross-section at least partially angular and preferably wedge-shaped or rectangular.

This has the advantage of particularly reliable transmission of torque from the roller body to the rod and from the rod to the surface segment in which surface segment groove of the rod engages.

For the purposes of the present application, the term "angled" is understood to mean that the rod has at least a right angle, an acute angle or an obtuse angle or any desired combinations thereof in cross-section.

The roller body preferably comprises a balancing device.

This has the advantage that an unbalanced Gewichtsvertei ^¬ lung relative to the longitudinal axis of the roll body, by which the Roller rotates during operation, can lead to high bearing loads or vibrations, which can be compensated by the balancing device. As a result, the operation is more reliable with less wear, which reduces the cost.

Particularly preferably, the balancing ^{device is ausgebil ¬} det as at least partially arranged in the roller body recess. The recess is designed in particular as a bore. The recess is arranged substantially parallel to the longitudinal axis of the roller body, wherein at least one balancing weight can be inserted into the recess. In particular, the Auswuchtge ^¬ weight is made of lead.

In particular, the roller has recesses spaced apart from one another in the circumferential direction, such that corresponding balancing weights can be inserted into the respective recesses for balancing the roller.

Further features and advantages of the invention will be explained in more detail below with reference to exemplary embodiments for better understanding, without the invention being restricted to the exemplary embodiments. Show it:

Figure 1: Schematic side view of an inventive

 Good bed roller mill with bulk material;

FIG. 2 is a schematic plan view of an alternative inventive material bed roller mill with bulk material;

Figure 3: schematic representation of an inventive

Profiles of a profile roller; alternative profile of a profile roller according to the invention ^¬ in a schematic representation; schematic representation of a novel material bed roller mill with a separation stage and product ^¬ supply; alternative arrangement of an inventive material bed roller mill with dissolver, separation stage and Pro ^¬ duktrückführung;

Flowchart of an inventive method un ter using two Gutbettwalzenmühlen; schematic representation of an enlarged section of a novel Gutbettwalzenmühle with two profiled rollers and bulk material; schematic side view of an alternative according to the invention Gutbettwalzenmühle with level sensor in the feed hopper;

FIG. 10: Arrangement of a good-bed roller mill according to the invention with a plurality of separating stages.

FIG. 11: Perspective view of an inventive device

Roller consisting of roller body and Oberflächenseg ^¬ ments in a partial exploded view;

FIG. 12: section along the longitudinal axis through a roll according to the invention according to FIG. 11; FIG. 13: front view parallel to the longitudinal axis of the roll according to the invention according to FIG. 11;

FIG. 14: a sectional view of a roll according to the invention according to FIG. 12 along the sectional plane B;

FIG. 15: Perspective view of a surface segment with visible roll surface;

FIG. 16: Perspective view of the surface segment according to FIG. 15 from below.

FIG. 1 shows a schematic side view of a good bed roller mill 9. A bed 6 comprises finer material to be ground 5 and coarser material to be ground 7, which is drawn by the rotation in the direction r of the two rollers 10 and 11 in the grinding gap d.

The roller 10 is movably mounted in the direction s, d. H. perpendicular to the direction of rotation, whereby a grinding gap d is adjustable. The rollers 10 and 11 both have a diameter w of 600 mm and are supported for rotation in direction r by means of the bearings 20. The rollers have a smooth roller surface 19. The bearing 20 has to avoid vibrations to a damping device 26, which is designed as pneumatic damping.

The grinding gap d is in the present case variable depending on the retracted bulk material 6, wherein a pressure acting in the direction of the grinding gap d by the rollers 10 and 11 is set so that the finer material to be ground 5 is ground by means of a packed particle bed in the grinding gap d and the coarser regrind 7 in the grinding gap d by direct contact with the rollers 10 and 11 is crushed. In this case, the good-bed roller mill 9 has the damping device 26 known to the person skilled in the art in order to prevent the occurrence of vibrations of the rollers relative to one another.

The roller 10 has a peripheral speed of 1 m / s and the roller 11 has a peripheral speed of 1.5 m / s. The Ge ^¬ schwindigkeitsverhältnis between the rollers 10 and 11 is as ^¬ forth at 1.5: 1.

In operation, by rotating the rollers in the direction of bulk material 6, finer material to be ground 5 and coarser material to be ground 7 are now drawn into the machine bed roller mill 9. Between the two rolls in the grinding gap d, which is set here to a value of 1 mm, forms a packed particle bed with respect to the finer millbase, whereby the finer millbase is ground.

The coarser material to be ground 7 in contact at least in the region of the grinding gap d ^¬ the first roller 10 and second roller 11, so that this coarser material to be ground is strongly crushed.

After milling, the ground product 17, which may be, for example, flour, is now removed from the high-pressure bed mill.

2 shows a schematic representation of a plan view of a material bed roller mill 9 substantially in accordance with Figure 1 is Darge ^¬ represents.

From here on and below, like reference characters denote like components throughout the figures. In contrast to the material bed roller mill 9 according to FIG. 1, here both rollers are movably mounted in the direction s. In operation for grinding, the rollers are rotatable about the longitudinal axis 21 by means of the bearings, not shown here, both of which comprise a damping device designed as a shock absorber, not shown here.

In contrast to FIG. 1, here the grinding gap d is fixedly set to a value of 1 mm during operation. In the present case, cereal 1 will be ground as a coarser millbase and semolina 3 as a finer millbase.

The roller 10 has in the present case a Umfangsgeschwindig ^¬ speed of 0.8 m / s and the roller 11 has a peripheral speed of 2.4 m / s. Thus, there is a speed ratio of 3: 1.

Another difference from Figure 1 is that the roller 10 is formed in the present case as a profile roller with a profile, not shown here.

FIG. 3 shows a detail of a profile of a roller in a schematic representation.

The profile has two completely illustrated, section-wise depressions 18 with a mean depth t of 1.2 mm, wherein the section-wise depressions 18 have a flat surface section 27 perpendicular to the radius of the profile roller. The flat surface portion 27 thus includes an angle p = 90 ° with the indicated as a dashed line radius of the roller. A width b of the recess 18 is 4.3 mm and a Ab k ^¬ stand between the segmental recesses on the roll surface 19 is 0.2 mm. The interior angle a is 135 °. On both sides of the section-wise recesses 18 with respect to Figure 3, the roller has not shown here further from ^¬ cut-way depressions.

In Figure 4, an alternative profile of a profile roller is shown as a detail. The profile roller has a recess 18 with a width b of 7 mm and a depth t of 1.8 mm. In contrast to FIG. 3, the section-wise depression 18 is not symmetrical and has an angle a of 120 ° on the one side in the circumferential direction and an angle a 'of 140 ° on the other side in the circumferential direction.

In Figure 5, a plant 24 comprising a Gut ^¬ bed roller mill 9 with two rollers 10 and 11 is shown schematically. The rollers 10 and 11, which are both designed as profile rollers with a profile according to Figure 3, are set to a fixed Mahl ^¬ gap d of 0.1 mm. The good bed roller mill 9 has a feed opening 15 for the bulk material 6, here rice, and a discharge opening 16 for the ground product 17. The ground product 17 is conveyed by means of a conveyor assembly 25 into a separation stage 14, which is designed here as a zigzag separator. In the zig- ^zag sifter, the ground product 17 is separated into finer ground product 12 and coarser ground product 13. This separation is essentially due to the physical properties of the particles, such as size, levitation properties and specific gravity, or combinations of these properties. By means of a feedback arrangement 23 is conveyed the coarser ground product 13 back to the supply port 15 of the Good ^¬ bed roll mill. 9 Finer ground product 12 is removed from the assembly 24 here as flour. 6 shows a further inventive arrangement 24 is is provided ^¬ having as a separation stage 14 is a plan sifter, and additionally between the material bed roller mill 9 and separation stage 14 includes a resolver 22. The resolver 22 is configured as a Impact detacher as the skilled person, for example from WO 2010 / 000811 AI is ^¬ known is. As bulk material 6 cocoa is used here.

FIG. 7 shows a flowchart of a method according to the invention. Bulk material 6, here sunflower seeds, is fed to a good bed roller mill 9 and ground in this. The ground product is fed to a separation stage 14 in which the ground product is separated into finer ground product 12 and coarser ground product 13. The coarser ground product 13 is conveyed back into the good ^¬ bed roll mill. 9

The finer ground product 12 is fed in this case a white ^¬ direct material bed roller mill 9, wherein this further Good ^¬ bed roll mill, a further separating stage is connected downstream of the fourteenth In this, the ground product from the further good-bed roller mill 9 is again separated into finer ground product 12 and coarser Mahlpro ^¬ product 13, wherein the coarser ground product 13 is fed back into the further Gutbettwalzenmühle 9. The finer ground product 12 can now be further processed as flour.

FIG. 8 is a schematic representation of a detail of a good bed roller mill 9. The first roller 10 and the second roller 11 are each formed with profiles according to Figure 3 ^¬ . The rollers rotate in the rotational direction R, the roller 10 has a peripheral speed of 3 m / s and the drum 11 a peripheral speed of 0.5 m / s, ie, the Zen Wal ^¬ have a speed ratio of 6: 1. A grinding gap d is fixed to a value of 0.8 mm, with no damping device is provided. The distance k is 0, 3 mm.

The bulk material 6 comprises semolina as a finer ground material and shell ^¬ parts 4 and not shown here grain as coarser meal ^¬ well, which is ground as described to Figure 1.

9 shows a material bed roller mill 9 as shown in FIG 1 Darge ^¬ represents. In a feed hopper 31 is grinding material 8, wel ^¬ Ches forms a bed. A supply of regrind 8 in the feed ^¬ funnel 31 is not shown here.

The feed hopper 31 comprises a level sensor 30 for measuring the level of ground material 8 in the feed hopper 31. Due to the ge ^¬ measured level of ground material 8 in the feed hopper 31, for example, the peripheral speed of at least one of Wal ^¬ zen 10 or 11 are set.

Smaller the level of ground material 8, for example under a vorbe ^¬ certain value, so at least one of the rollers, the level increase of millbase 8 in the feed hopper 31 10 or 11 by reduction of the peripheral speed, as will be reduced by this measure the flow rate through the material bed roller mill 9 while regrind 8 continues to be fed into the feed hopper 31.

By increasing the peripheral speed of at least one of the rollers 10 or 11, the level of material to be ground 8 in the feed hopper 31 can be reduced because through this measure the throughput is increased by the Goodbettwalzenmühle 9, while material to be ground 8 is further supplied to the feed hopper 31. It is also possible, on the basis of the measurement with the level sensor 30, to control the supply of ground material 8 into the feed hopper 31 in order to increase or decrease the level in the feed hopper 31 at a constant throughput through the good bed roller mill 9.

A difference from Figure 1 is that the rollers 10 and 11 are formed as profile rollers with a profile, not shown here.

10 shows a further alternative according to the invention An ^¬ assembly 24 is shown having as plates 14 a plan sifter and a zigzag classifier.

About a Good bed roller mill 9 is a bed 6, here a mixture of rice and cereals, from regrind. The meal is ground ^¬ well in the material bed roller mill 9 in ground product, which is then conveyed into the plansifter.

In the plan sifter the ground product in a finer Mahlpro ^¬ domestic product 12, mid-ground product 29 and coarser ground 13 separately. In addition, another fraction from the plansifter as flour 2 is discharged. The middle ground product 29 is conveyed to a further separation stage 14, which is designed here as a zig-zag separator. The middle ground product 29 is separated in the zigzag sifter into finer ground product and coarser ground product 13, wherein the zigzag sifter is adjusted so that the finer ground product contains essentially bran 28. The mass fraction of bran 28 on the ground material is in the range from 1% by weight to 10% by weight and in particular in the range from 3% by weight to 5% by weight, based on the millbase.

The finer ground product 12 and the coarser ground product 13 from the plansifter and the coarser ground product 13 from the planifier Zack classifiers are conveyed back into the bed of high-pressure roller 9 by means of the return arrangement 23.

FIG. 11 shows, in a perspective illustration with a partial exploded view, a roller 32 according to the invention consisting of a roller body 42 and a plurality of surface segments 33. On the side remote from the roller body 42, the surface segments 33 have a roller surface 19.

The roller 32 has a balancing device 36, which is formed by a plurality of bores substantially parallel to the longitudinal axis of the roller 32. Not Darge ^¬ set of lead balance weights are here inserted into the bores, wherein, after Einset ^¬ wetting of the balancing weights, the bores being closed by means of closure caps 41st

The roller body 42 has a roller groove 37 into which a torque transmission device 34 designed as a rod can be inserted. The rod is releasably securable in the roller groove 37 by means of a transfer fastening device 40 designed as a screw. The rod is designed so that the ser ^¬ protrudes insertion into the roll groove 37 in the radial direction of the roll groove 37th

The surface segments 33 have, on the side facing the roller body 42, a surface segment groove 38, into which the rod, that is to say the torque transmission device 34, can engage. In addition, fastening means 35 designed as screws are provided, by means of which the surface segment can be detachably connected to the roller body 42. In the assembled state, the rod engages in the Oberflächensegmentnut 38, where ^¬ by a reliable torque transmission during operation of Roll body 42 is ensured on the surface segment 33.

In FIG. 12, the roller 32 according to the invention according to FIG. 11 is shown in a sectional view parallel to the longitudinal axis. A segment length o of the surface segments 33 is about 400 mm.

FIG. 13 shows a front view parallel to the longitudinal axis 21 of the inventive roller 32 according to FIG. 11.

The roller 32 comprises 10 surface segments 33. In the area formed by the surface segment groove and roller groove, the torque transmission device 34 formed as a rod is received.

FIG. 14 shows, in a sectional view parallel to the axis B according to FIG. 12, the roller 32 according to the invention.

The roller 32 includes 10 surface segments 33 which each extend over ei ^¬ NEN m angular range of 36 °. The surface segments 33 are detachably connected to the roller body 42, wherein a rectangular rod is received as a torque transmission device 34 in the area formed by the roller groove 37 and Oberflächensegmentnut 38 ^¬ th area.

15 shows a perspective view of a surface segment 33 with the roll surface 19. In Figure 16, the segments that bolstered Oberflä ^¬ 33 according to Figure 15 shown in a further perspective view from below, in which the Oberflächensegmentnut 38 is visible.

Claims

claims 1. A method for producing flour (2) and / or semolina (3) from good, in particular grain (1), cocoa, sunflower seeds and rice or any combination thereof, comprising the fol ^¬ ing steps:  - Feeding of material from a bed (6) in a feed opening (15) of a Gutbettwalzenmühle (9) comprising a first roller (10) and a second roller (11), wherein for adjusting a Mahlspalts (d) between the two rollers (10, 11) at least one of the two rollers (10, 11) is movably mounted in a direction (s) substantially perpendicular to the direction of rotation of one of the two rollers (10, 11), and wherein a damping with respect to a deflection in the direction (s ) of the roller is adjustable and / or the grinding gap (d) is fixed, wherein the bed (6) of particles having a size distribution and in particular is at least one of the following types of ground material or mixtures thereof: Good, semolina (3), trays ^¬ parts (4);  marked by - Setting the fixed grinding gap (d) or the damping, such that a first subset of the bed (6) ent ^¬ holding finer millbase (5) a packed Partikelschüt- device in the grinding gap (d) forms and individual particles of a second subset of the bed (6) containing coarser millbase (7) in contact with the first roll (10) and the second roll (11) of the good bed roll mill (9); - grinding the bulk material (6) in the high-bed roller mill (9) into ground product (17); - Removal of the meal product (17) through a discharge opening (16). 2. The method according to claim 1, characterized in that the first roller (10) and the second roller (11) rotate at unterschiedli ^¬ cher speed, preferably in a speed ratio of greater than 1.1: 1, more preferably of greater 2: 1. 3. The method according to any one of claims 1 to 2, characterized in that at least one of the two rollers (10; 11) is formed as a profile roller, in particular with at least one section-wise recess (18) in the roller surface (19), wherein the section-wise recess (18) is formed in particular substantially parallel to the longitudinal axis of the profile ^{roller ¬} . 4. The method according to claim 3, characterized in that the profile of the profile roller is substantially self-cleaning out ^¬ forms, in particular at least during rotation of the profile roller. 5. The method according to any one of claims 1 to 4, characterized in that subsequent to the grinding of the bulk material (2) the ground product (17) is conveyed to a separation stage (14) for separation into finer ground product (12) and coarser ground product (13), in particular the coarser ground product (13) is fed back into the feed opening (15). 6. The method according to claim 5, characterized in that the separation stage (14) has a further material bed roller mill (9) is nachge ^¬ on for further grinding the ground product finer (12). 7. Material bed roll mill (9) for carrying out a method ge ^¬ Mäss one of the preceding claims, comprising a first Roller (10) and a second roller (11), wherein at least one of the two rollers (10; 11) is formed as a profile roller with at least one sectionwise recess (18) in the roller surface (19), in particular substantially parallel to the longitudinal axis of the profile roller , characterized in that the section-wise depression (18) is self-cleaning at least during rotation of the profiled roller. 8. Material bed roll mill (9) according to claim 7, characterized labeled in ^¬ characterized in that at least one of the two rollers (10; 11) into a ^¬ ner direction (s) substantially perpendicular to the direction of rotation of one of the two rollers (10; 11) movably mounted is for adjusting a grinding gap (d) between the two rollers (10, 11), wherein an attenuation by means of a Dämpfungseinrich ^¬ device (26) with respect to a deflection in the direction (s) of the roller is adjustable and / or the grinding gap (d) fixed is adjustable ^¬ bar. 9. Good bed roller mill (9) according to one of claims 7 to 8, characterized in that the at least one section ^¬ depression (18) in the circumferential direction of the roll profile on average a width (b) in the range of 0.5 mm to 20 mm, be ^¬ preferably 2 mm to 10 mm and particularly preferably from 4 mm to 6 mm. 10. Good bed roller mill (9) according to one of claims 7 to 9, characterized in that the at least one section ^¬ depression (18) of the roll profile in the radial direction on average a depth (t) in the range of 0.3 mm to 10 mm, before ^¬ has from 0.5 mm to 5 mm and more preferably from 0.7 mm to 1.8 mm. 11. Good bed roller mill (9) according to any one of claims 7 to 10, characterized in that the roller surface (19) with the at least one section recess (18) of the profiled roller along a section between the roller surface and the surface of the recess which schnei the roller surface ^¬ det, on average an internal angle (a) of 100 ° to 170 °, be ^¬ preferably from 120 ° to 150 ° and particularly preferably from 130 ° to 140 ° includes. 12. Good bed roller mill (9) according to one of claims 7 to 11, characterized in that the profiled roller at least two circumferentially spaced apart, partially depressions (18), in the circumferential direction a mean distance (k) in the range of 0.15 mm to 10 mm, preferably from 0.15 mm to 5 mm and particularly preferably from 0.15 mm to 0.5 mm. 13. Good bed roller mill (9) according to one of claims 7 to 12, characterized in that the sectionwise recess (18) of the profile roller has a flat surface portion (27), in ^¬ particular substantially perpendicular to the radius of Profilwal ^¬ ze. 14. Good bed roller mill (9) according to any one of claims 7 to 13, characterized in that the first roller (10) and / or the second roller (11) has a diameter (w) in the range of 400 mm to 1000 mm and preferably of 600 mm have ^¬ to 800 mm. 15. Use of a material bed roller mill (9) according to one of claims 7 to 14 An ^¬ for the production of flours and / or semolina of cereals, cocoa, sunflower seeds and rice or combinations thereof belie ^¬-lived according to a method according to any one of claims 1 to 6. 16 surface segment (33) for forming a particular profi ^¬ lated roller surface (19) of a roller (32), in particular for a Gutbettwalzenmühle (9) according to one of claims 7 to 14, wherein the surface segment (33) on a Walzenkör ^¬ per ( 42) for forming the roller (32) by means of a fastening ^¬ supply means (35) is detachably fastened and in the circumferential direction of the roller body (42) an angular range (m) of 22 ° to 90 °, preferably from 30 ° to 45 ° and more preferably swept from 32 ° to 40 °. 17 surface segment (33) according to claim 16, characterized marked ^¬ characterized in that the surface segment (33) is formed in cross-section substantially annular segment-shaped. 18 surface segment (33) according to claim 16 or 17, characterized in that the surface segment (33) with a torque transfer device (34) is operatively connected, such that a torque from the roller body (42) on the surface segment (33) is transferable. 19. Surface segment (33) according to one of claims 16 to 18, characterized in that the surface segment (33) has a surface segment groove (38) on the side facing the roller body (42) for engagement with the torque transmission ^device (34). , 20, surface segment (33) according to claim 19, characterized characterized labeled in ^¬ that the Oberflächensegmentnut (38) parallel when used as intended substantially to Längsach- se (21) of the roller (32) extends. 21. Set comprising surface segments (33) according to one of the at ^¬ claims 16 to 20 to form a closed rolling surface (19) of a roll (32), wherein the set 4 to 16 before ^¬ Trains t 8 to 12, particularly preferably 9 to 11 and very special ^¬ DERS preferably 10 surface segments (33). 22. Set according to claim 21 comprising at least one torque transmission ^device (34) for torque transmission between roller body (42) and surface segment (33), wherein in particular the set comprises the same number of Drehmomentübertra ^¬ supply devices (34) as surface segments (33). 23 roller (32) comprising a roller body (42) and at least one surface segment (33) according to one of claims 16 to 20, characterized in that the surface segment (33) by means of a fastening means (35) releasably on the roller ^¬ body (42 ) is fastened, wherein the roller (32) (for transmitting torque from the roll body 42) to the surface segment (33) holds a Drehmo ^¬ ment transmitting means (34) about ^¬. 24. Roller (32) according to claim 23, characterized in that the roller body (42) has a roller groove (37) in which the torque transmission device (34) is detachably fastened. 25. Roller (32) according to claim 24, characterized in that the torque transmission device (34) is designed as a rod for simultaneous engagement in the roller groove (37) and a Oberflächensegmentnut (38) of the surface segment (33) 26 roller (32) according to claim 25, characterized in that the rod is formed in cross-section at least in sections at an angle and preferably wedge-shaped or rectangular. 27. Roller (32) according to one of claims 23 to 26, characterized ge ^¬ indicates that the roller body (42) comprises a balancing device (36). 28 roller (32) according to claim 27, characterized in that the balancing device (36) as at least partially in the roller body (42) arranged recess, in particular bore, is formed, wherein the recess substantially parallel to the longitudinal axis (21) of the roller body ( 42) is angeord ^¬ net, and wherein in the recess at least one balancing ^¬ weight can be used.