EP2726208B1 - Dispositif et procédé pour produire de la farine et/ou de la semoule - Google Patents

Dispositif et procédé pour produire de la farine et/ou de la semoule

Info

Publication number
EP2726208B1
EP2726208B1 EP12733664.2A EP12733664A EP2726208B1 EP 2726208 B1 EP2726208 B1 EP 2726208B1 EP 12733664 A EP12733664 A EP 12733664A EP 2726208 B1 EP2726208 B1 EP 2726208B1
Authority
EP
European Patent Office
Prior art keywords
roller
rollers
mill
roller mill
pressure roller
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.)
Active
Application number
EP12733664.2A
Other languages
German (de)
English (en)
Other versions
EP2726208A2 (fr
Inventor
Stephen Weinmann
Daniel Rickenbach
Marcos LUQUIN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Buehler AG
Original Assignee
Buehler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Buehler AG filed Critical Buehler AG
Priority to EP12733664.2A priority Critical patent/EP2726208B1/fr
Publication of EP2726208A2 publication Critical patent/EP2726208A2/fr
Application granted granted Critical
Publication of EP2726208B1 publication Critical patent/EP2726208B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • B02C4/06—Crushing or disintegrating by roller mills with two or more rollers specially adapted for milling grain
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members
    • B02C4/38—Adjusting, applying pressure to, or controlling the distance between, milling members in grain mills

Definitions

  • the present invention relates to a method for producing a milled product consisting of flour and/or semolina and to a high-pressure roller mill according to the preambles of the independent claims.
  • a roller mill for fine grinding of brittle material is known, whereby, depending on the material feed and the contact pressure of the rollers required for comminution, a roller gap width is set which is larger than the grain size of the essential part of the feed material.
  • a process for producing flour and/or semolina uses a high-pressure roller mill with a variable gap.
  • the gap is adjusted depending on the quantity and type of grain to be milled, as well as the pressure exerted on the rollers in the direction of the gap.
  • a further object of the present invention is to provide a device and a method with which flour can be produced from a material in a cost-effective and energy-efficient manner, wherein, in particular, sufficient heat is also supplied to the flour during milling.
  • the process according to the invention for producing a milled product consisting of flour and/or semolina from a material selected from the group consisting of cereals, cocoa, sunflower seeds and rice or combinations thereof comprises the following steps: Providing a material bed roller mill, comprising a feed opening and a discharge opening.
  • the material bed roller mill comprises a first roller and a second roller, wherein at least one of the two rollers is movably mounted in a direction substantially perpendicular to the direction of rotation of the other of the two rollers for setting a grinding gap between the first and second rollers.
  • the bed of material is provided and consists of particles with a size distribution, wherein a first partial amount of the bed of material consists of finer ground material and a second partial amount of the bed of material consists of coarser ground material.
  • the grinding gap is adjusted such that, when used as intended, the first and second rollers do not oscillate relative to one another, wherein the first partial amount of the bed containing finer ground material forms a packed bed of particles in the grinding gap.
  • the adjustment is made such that individual particles of the second partial quantity of the bulk material containing coarser ground material are in contact with the first roller and the second roller of the material bed roller mill.
  • a material bed is created in the intake area between the rollers from an excess of material, by means of a filled material chute or hopper, so that the first and second rollers can draw the material from the intake area into the grinding gap.
  • the bulk material is then ground by exerting pressure on the first and second rollers in the direction of the grinding gap of the material bed roller mill to produce the ground product.
  • the ground product is discharged through the discharge opening, whereby following the grinding of the bulk material, the ground product is conveyed to a separation stage for separation into finer ground product and coarser ground product, and whereby The ground product is then fed back into the feed opening.
  • goods are understood to mean cereals, cocoa, sunflower seeds and rice or any combination thereof.
  • the cereals used in the process according to the invention are preferably bread wheat, durum wheat, maize and buckwheat or any combination thereof.
  • a pressure in the direction of the grinding gap on the rollers is preset and/or adjustable, for example in conjunction with the damping.
  • a material bed roller mill is understood to be a roller mill in which a material bed is formed in the intake area between the rollers when the material bed roller mill can draw in an excess of material, e.g., via a filled material chute or hopper.
  • the material bed comminution is based on a packed bed of particles in the grinding gap.
  • a direction of rotation is understood to be the vector perpendicular to the plane of rotation in the mathematical sense.
  • damping with respect to a deflection in the direction in which the roller is movably mounted is understood to mean damping for the suppression of vibrations, as is the case, for example, with shock absorbers or adjustable hydraulic and/or pneumatic damping is possible, whereby hydraulic damping is preferably used.
  • adjustable damping with respect to deflection is particularly advantageous when a force-controlled roller mill is used, in which, for example, mechanically preloaded springs or hydraulically coupled gas pressure accumulators are used to generate force and pressure is exerted on the rollers in the direction of the grinding gap.
  • a grinding gap forms between these rollers depending on the quantity and type of material to be ground in the grinding gap as well as the set pressure. Fluctuations in the composition of the material to be ground or a certain proportion of coarser material to be ground that is in contact with both rollers can, for example, cause the material bed roller mill to vibrate. These vibrations can then be reduced or even completely suppressed with the adjustable damping.
  • damping is preferably avoided, since the rollers are locked to each other and therefore do not vibrate with each other.
  • 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.
  • a grinding gap is understood to mean the gap between the two rollers and in particular the smallest roller distance during operation of the material bed roller mill, whereby only the area of the rollers is taken into account which, when used as intended, is in contact with the ground material.
  • the method according to the invention has the advantage that the finer material to be ground is ground in a material bed, while the coarser material to be ground is also comminuted and, in particular, subjected to significant stress, so that the coarser material to be ground is already comminuted in a single pass. This largely avoids the use of multiple grinding stages, while also achieving the highest possible energy efficiency of the grinding process.
  • the first roller and the second roller rotate at different speeds.
  • the speed ratio is greater than 1.1:1 and, more particularly, greater than 2:1.
  • a further advantage is that the adjustment of the speed ratio (i.e., the rotational speed ratio) of the rollers is an additional parameter for optimizing the milling process for flour production, thus allowing the process to be more effectively optimized. Furthermore, a lower pressure can be used in the milling gap, as the grinding process is supported by the particularly strong shear forces resulting from the different roller speeds. This leads to lower pressures and thus better dissolvability for further separation of the milled product after milling.
  • the speed at which a roller rotates is understood to mean the speed of the roller surface in the tangential direction.
  • At least one of the two rollers is designed as a profile roller.
  • the profile roller has, in particular, a recess in the roller surface in certain sections, in particular substantially parallel to the longitudinal axis of the respective roller.
  • the roller surface is understood to be the surface which is radially furthest away from the longitudinal axis, whereby only the part which is in contact with the grinding material during operation and when used as intended is taken into account.
  • the profile of the profile roller is designed to be substantially self-cleaning, in particular at least during the rotation of the profile roller.
  • self-cleaning means that at least during rotation, i.e. during operation of the rollers, the 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 design of the section-wise depressions has the advantage that the feed of grinding material into the material bed roller mill can be carried out reliably over the long term during operation, which is often not the case with non-self-cleaning section-wise depressions.
  • the self-cleaning design of the sectional depressions can be achieved by selecting the geometry of the sectional depressions and/or by selecting the appropriate surface roughness.
  • the ground product is conveyed to a separation stage for separation into a finer ground product and a coarser ground product.
  • the coarser ground product is conveyed back into the feed opening.
  • Such separation stages such as zigzag sifters, semolina purifiers, plan sifters, turbo sifters, scattering disc sifters or cross-flow sifters are known from the state of the art, for example in the WO 2010/000811 A2 described.
  • Zig-zag sifters for example, separate the product to be separated into finer product and coarser product due to the different specific gravity and/or size of the particles in the product.
  • Plan sifters for example, separate the product to be separated into finer product and coarser product by sieving, essentially based on the size of the particles in the product.
  • This separation of the ground product into finer and coarser fractions has the advantage that the respective fractions can be used for different purposes.
  • Returning the coarser ground product to the feed opening of the high-pressure roller mill has the advantage that the plant can be operated in closed-loop mode, thus reducing the number of high-pressure roller mills or other grinding stages, leading to cost and energy savings.
  • a further high-pressure roller mill is arranged downstream of the separation stage for further grinding of the finer ground product.
  • the additional high-pressure roller mill can have other process parameters, such as the speed of the rollers or the grinding gap, for optimal grinding of the finer ground product.
  • a further aspect is directed to a material-bed roller mill for carrying out a method as described above.
  • This material-bed roller mill comprises a first roller and a second roller, wherein at least one of the two rollers is designed as a profile roller with at least one section-wise depression in the roller surface.
  • This section-wise depression is formed, in particular, substantially parallel to the longitudinal axis of the profile roller.
  • the section-wise depression is self-cleaning, at least during rotation of the profile roller.
  • the self-cleaning property of the sectional recess is achieved by the geometric design and/or by the surface properties of the sectional recess.
  • this has the advantage that even when using a profile roller, the feed of grinding material into the grinding gap is permanently reliable during operation.
  • the section-wise depression extends at least over the entire length of the profile roller, which is in contact with the grinding material during intended use.
  • the section-wise depression is designed as a section-wise depression in the circumferential direction.
  • At least one of the two rollers is preferably mounted so as to be movable in a direction substantially perpendicular to the direction of rotation of one of the two rollers. Damping with respect to a deflection in the direction in which the roller is movably mounted is adjustable, and/or the grinding gap is fixed.
  • a fixed setting of the grinding gap means infinite damping, since with a fixed setting of the grinding gap, essentially no vibrations of the rollers relative to each other are possible when used as intended.
  • At least one section of the recess in the circumferential direction of the profile roller has an average width in the range of 0.5 mm to 20 mm.
  • this average width is in the range of 2 mm to 10 mm, and more particularly in the range of 4 mm to 6 mm.
  • the mean width is understood to mean the mean value of the width along the longitudinal direction, i.e. the longest extent of the sectional depression.
  • the at least one section-wise depression of the profile roller has an average depth in the range of 0.3 mm to 10 mm in the radial direction of the roller.
  • the depth is preferably in the range of 0.5 mm to 5 mm, and particularly preferably in the range of 0.7 mm to 1.8 mm.
  • the mean of a depth of the sectional depression is understood to be the mean value of the deepest point along the greatest extent of the sectional depression.
  • the roller surface with the at least one section-wise depression of the profile roller has an average internal angle of 100° to 170° in a section between the roller surface and the surface of the depression that intersects the roller surface.
  • the roller surface forms an angle of 120° to 150° with the at least one section-wise depression, and particularly preferably, of 130° to 140°.
  • an interior angle is understood to be an angle facing the longitudinal axis of the profile roller on the inside of the roller surface in a sectional plane perpendicular to the longitudinal axis.
  • an average of an interior angle is defined as an average value along a section between the roller surface and the section-wise depression.
  • This design as described above with regard to one of the parameters width, depth and internal angle or combinations thereof has the advantage that the section-wise recess is self-cleaning, at least during rotation of the profile roller, whereby operation can be reliable in the long term and, moreover, complex cleaning devices, which are costly, are not required.
  • the profile roller has at least two circumferentially spaced-apart, section-wise depressions. These circumferentially spaced-apart section-wise depressions have an average spacing 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.
  • the mean distance between the sectional depressions is understood to be the mean distance along the longest extent of the sectional depression, whereby the distance is determined between the two mutually facing sides of the sectional depressions.
  • a flat surface section does not include curved or bent surface sections, although such a surface section with a usual surface roughness and/or damage that usually occurs during operation, such as scratches, is also considered to be flat.
  • the first roller and/or the second roller of the material bed roller mill has a diameter in the range from 400 mm to 1000 mm and preferably from 600 mm to 800 mm.
  • This large diameter in contrast to conventional roller mills, has the advantage of improving product feed.
  • a further aspect is directed to the use of a high-pressure roller mill as described above for producing flours and/or semolina from cereals, cocoa, sunflower seeds and rice or any combinations thereof according to the process described above.
  • a further aspect relates to a surface segment for forming a particularly profiled roller surface of a roller.
  • a roller for a material bed roller mill is formed as described above.
  • the surface segment can be releasably fastened to a roller body to form the roller by means of a fastening means.
  • the surface segment covers an angular range of 22° to 90°, preferably 30° to 45°, and particularly preferably 32° to 40°.
  • the modular design of the roller consisting 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. Furthermore, the surface segments have the advantage that, depending on the diameter of the roller body, the angle range covered by the surface segments can be selected, so that the surface segments can be whose appropriate size is easy to handle and not too heavy.
  • roller comprising surface segments and roller body can be used as a first roller and/or second roller in a high-pressure roller mill as described above.
  • the surface segment is formed in cross-section substantially in the shape of a ring segment.
  • cross-section through a surface segment is understood to mean that the cut is made perpendicular to the longitudinal axis of the roller when the surface segment is used as intended.
  • Ring segment-shaped surface segments have the advantage that less material is used to manufacture the surface segments, which makes the surface segments more cost-effective and lighter, which facilitates handling, especially during assembly or disassembly.
  • the surface segment is operatively connectable to a torque transmission device such that a torque can be transmitted from the roller body to the surface segment.
  • a “torque transmission device” is understood to mean a device such that the torque exerted on the roller body during operation for driving the roller can be reliably transmitted to the surface segments, so that the surface segments are not inadvertently detached from the roller body during operation due to the forces occurring during operation.
  • the surface segments are usually attached to the roller body with fastening means in the form of screws, although the screws may not be sufficiently stable, so that surface segments may become detached when large shear forces occur during operation, which must be avoided; in such a case, an additional torque transmission device leads to more reliable and thus more cost-effective operation.
  • the surface segment has a surface segment groove on the side facing the roller body for engagement by the torque transmission device.
  • the surface segment groove runs substantially parallel to the longitudinal axis of the roller when used as intended.
  • An additional aspect relates to a set comprising surface segments as described above for forming a closed roller surface of a roller.
  • the set comprises 4 to 16, preferably 8 to 12, particularly preferably 9 to 11 and most particularly preferably 10 surface segments.
  • a "closed" roller surface is understood to mean a surface that is essentially circumferentially uninterrupted. In other words, in the area of the roller that comes into contact with the material during intended use, the roller body is completely covered by surface segments.
  • the set preferably comprises a torque transmission device between the roller body and the surface segment.
  • the set comprises the same number of torque transmission devices as surface segments.
  • the torque transmission device is designed as a rod for engaging in a surface segment groove of the surface segment, wherein the rod is preferably angular in cross-section, at least in sections, and in particular wedge-shaped or rectangular.
  • a further aspect relates to a roller comprising at least one surface segment as described above and a roller body.
  • the surface segment is releasably attached to the roller body by means of a fastening means.
  • the roller comprises a torque transmission device for transmitting torque from the roller body to the surface segment.
  • the roller body has a roller groove in which the torque transmission device can be releasably fastened.
  • the torque transmission device is designed as a rod for simultaneous engagement in the roller groove and a surface segment groove of the surface segment.
  • angular in the context of the present application means that the bar has at least one right angle, one acute angle or one obtuse angle or any combination thereof in its cross-section.
  • the roller body comprises a balancing device.
  • the balancing device is designed as a recess arranged at least partially in the roller body.
  • the recess is in particular designed as a bore.
  • the recess is arranged essentially parallel to the longitudinal axis of the roller body, and at least one balancing weight can be inserted into the recess.
  • the balancing weight is made of lead.
  • 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.
  • a material bed roller mill 9 is shown in a schematic side view.
  • a bed 6 comprises finer ground material 5 and coarser ground material 7, which is drawn into the grinding gap d by the rotation in direction r of the two rollers 10 and 11.
  • the roller 10 is mounted for movement in the direction s, i.e., perpendicular to the direction of rotation, allowing a grinding gap d to be adjusted.
  • the rollers 10 and 11 both have a diameter w of 600 mm and are mounted for rotation in the direction r by means of bearings 20.
  • the rollers have a smooth roller surface 19.
  • the bearing 20 has a damping device 26, which is designed as a pneumatic damper.
  • the grinding gap d is variable depending on the drawn-in bulk material 6, with a pressure acting in the direction of the grinding gap d by the rollers 10 and 11 being adjusted such that the finer grinding material 5 is ground by means of a packed bed of particles in the grinding gap d, and the coarser grinding material 7 is comminuted in the grinding gap d by direct contact with the rollers 10 and 11.
  • the material bed roller mill 9 has the damping device 26, known per se to those skilled in the art, in order to prevent the occurrence of vibrations between the rollers.
  • 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 speed ratio between reels 10 and 11 is therefore 1.5:1.
  • the rollers rotate in the direction r, drawing the bulk material 6, comprising finer ground material 5 and coarser ground material 7, into the material bed roller mill 9.
  • the grinding gap d which is set here to a value of 1 mm, a packed bed of particles forms with respect to the finer ground material, whereby the finer ground material is ground.
  • the coarser ground material 7 touches the first roller 10 and the second roller 11 at least in the area of the grinding gap d, so that this coarser ground material is greatly crushed.
  • the grinding product 17, which may be flour, for example, is discharged from the high-pressure roller mill.
  • Figure 2 is a schematic representation of a plan view of a material bed roller mill 9 essentially according to Figure 1 shown.
  • both rollers are movably mounted in the direction s.
  • the rollers are rotatable about the longitudinal axis 21 by means of the bearings not shown here, which both comprise a damping device designed as a shock absorber, not shown here.
  • the grinding gap d is set to a fixed value of 1 mm during operation.
  • grain 1 is milled as the coarser material
  • semolina 3 is milled as the finer material.
  • roller 10 has a peripheral speed of 0.8 m/s
  • roller 11 has a peripheral speed of 2.4 m/s. This results in a speed ratio of 3:1.
  • roller 10 in the present case is designed as a profile roller with a profile not shown here.
  • FIG. 3 A section of a roller profile is shown in a schematic representation.
  • the profile has two fully illustrated, sectioned depressions 18 with an average depth t of 1.2 mm, with the sectioned depressions 18 having a flat surface section 27 perpendicular to the radius of the profiled roller.
  • the width b of the depression 18 is 4.3 mm, and the distance k between the sectioned depressions on the roller surface 19 is 0.2 mm.
  • the interior angle a is 135°.
  • the roller On both sides of the section-wise depressions 18, as shown in Figure 3, the roller has further section-wise depressions not shown here.
  • FIG 4 An alternative profile of a profile roller is shown as a section.
  • the profile roller has a recess 18 with a width b of 7 mm and a depth t of 1.8 mm.
  • the sectioned recess 18 is, in contrast to Figure 3 not symmetrical and has an angle a of 120° on one side in the circumferential direction and an angle a' of 140° on the other side in the circumferential direction.
  • FIG 5 is shown schematically a plant 24 comprising a material bed roller mill 9 with two rollers 10 and 11.
  • the rollers 10 and 11, which are both profile rollers with a profile according to Figure 3 are designed to a fixed grinding gap d of 0.1 mm.
  • the high-pressure 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 conveying arrangement 25 into a separation stage 14, which is designed here as a zigzag sifter. In the zigzag sifter, the ground product 17 is separated into finer ground product 12 and coarser ground product 13.
  • FIG. 6 a further arrangement 24 according to the invention is shown, which has a plan sifter as the separation stage 14 and additionally a dissolver 22 between the material bed roller mill 9 and the separation stage 14.
  • the dissolver 22 is designed as an impact dissolver, as is known to the person skilled in the art, for example, from WO 2010/000811 A1 is known. Cocoa is used here as bulk material 6.
  • FIG. 7 A flow diagram of a process according to the invention is shown.
  • Bulk material 6, here sunflower seeds is fed to a high-pressure roller mill 9 and ground therein.
  • the ground product is fed to a separation stage 14, where the ground product is separated into finer ground product 12 and coarser ground product 13.
  • the coarser ground product 13 is conveyed back to the high-pressure roller mill 9.
  • the finer ground product 12 is fed to another high-pressure roller mill 9, which is followed by another separation stage 14.
  • the ground product from the other high-pressure roller mill 9 is again separated into finer ground product 12 and coarser ground product 13, with the coarser ground product 13 being returned to the other high-pressure roller mill 9.
  • the finer ground product 12 can now be further processed as flour.
  • FIG 8 A schematic representation of a material bed roller mill 9 is shown.
  • the first roller 10 and the second roller 11 are each provided with profiles according to Figure 3
  • the rollers rotate in the direction of rotation r, with roller 10 having a peripheral speed of 3 m/s and roller 11 having a peripheral speed of 0.5 m/s, ie the rollers have a speed ratio of 6:1.
  • the bulk material 6 includes semolina as finer ground material and shell parts 4 as well as grain not shown here as coarser ground material, which as Figure 1 described is ground.
  • FIG 9 is a high-pressure roller mill 9 according to Figure 1 shown.
  • Ground material 8 is located in a feed hopper 31, forming a bed. The feed of ground material 8 into the feed hopper 31 is not shown here.
  • the level of ground material 8 in the feed hopper 31 can be increased by reducing the peripheral speed of at least one of the rollers 10 or 11, since this measure reduces the throughput through the material bed roller mill 9, while ground material 8 continues to be fed into the feed hopper 31.
  • the level of grinding material 8 in the feed hopper 31 can be reduced, since this measure increases the throughput through the material bed roller mill 9, while grinding material 8 continues to be fed into the feed hopper 31.
  • rollers 10 and 11 are designed as profile rollers with a profile not shown here.
  • FIG 10 a further alternative arrangement 24 according to the invention is shown, which has a plan sifter and a zigzag sifter as separation stages 14.
  • a high-pressure roller mill 9 is a hopper 6 containing a mixture of rice and grain.
  • the material is ground in the high-pressure roller mill 9 into a ground product, which is then conveyed to the plansifter.
  • the milled product is separated into a finer milled product 12, a medium milled product 29, and a coarser milled product 13.
  • a further fraction is discharged from the plansifter as flour 2.
  • the medium milled product 29 is conveyed to a further separation stage 14, which is designed here as a zigzag sifter.
  • the medium milled product 29 is separated in the zigzag sifter into finer milled product and coarser milled product 13, with the zigzag sifter being adjusted so that the finer milled product essentially contains bran 28.
  • the mass fraction of bran 28 in the milled product is in the range of 1 wt.% to 10 wt.% and in particular in the range of 3 wt.% to 5 wt.%, based on the milled product.
  • the finer ground product 12 and the coarser ground product 13 from the plan sifter as well as the coarser ground product 13 from the zigzag sifter are conveyed back into the material bed roller mill 9 by means of the return arrangement 23.
  • FIG 11 A perspective view with a partial exploded view shows a roller 32 consisting of a roller body 42 and several surface segments 33. On the side facing away from the roller body 42, the surface segments 33 have a roller surface 19.
  • the roller 32 has a balancing device 36 formed by a plurality of bores substantially parallel to the longitudinal axis of the roller 32.
  • Lead balancing weights (not shown here) can be inserted into the bores, and after the balancing weights have been inserted, the bores can be closed by means of closure caps 41.
  • 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 can be releasably secured in the roller groove 37 by means of a transmission fastening device 40 designed as a screw.
  • the rod is designed such that, after being inserted into the roller groove 37, it protrudes radially from the roller groove 37.
  • the surface segments 33 have a surface segment groove 38 on the side facing the roller body 42, into which the rod, i.e., the torque transmission device 34, can engage. Additionally, fastening means 35 designed as screws are provided, by means of which the surface segment can be releasably connected to the roller body 42. In the assembled state, the rod engages in the surface segment groove 38, thereby ensuring reliable torque transmission during operation from the roller body 42 to the surface segment 33.
  • roller 32 is according to Figure 11 shown in a sectional view parallel to the longitudinal axis.
  • a segment length o of the surface segments 33 is approximately 400 mm.
  • Figure 13 is a front view parallel to the longitudinal axis 21 of the roller 32 according to Figure 11 shown.
  • the roller 32 comprises 10 surface segments 33.
  • the torque transmission device 34 designed as a rod, is accommodated in the area formed by the surface segment groove and roller groove.
  • Figure 14 is in a sectional view parallel to the axis B according to Figure 12 the roller 32 is shown.
  • the roller 32 comprises 10 surface segments 33, each covering an angular range m of 36°.
  • the surface segments 33 are detachably connected to the roller body 42, with a rectangular rod serving as a torque transmission device 34 being accommodated in the area formed by the roller groove 37 and surface segment groove 38.
  • Figure 15 shows a perspective view of a surface segment 33 with roller surface 19.
  • Figure 16 is the surface segment 33 according to Figure 15 shown in a further perspective from below, in which the surface segment groove 38 is visible.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Adjustment And Processing Of Grains (AREA)

Claims (13)

  1. Procédé de fabrication d'un produit de mouture (1) constitué de farine (2) et/ou de semoule (3) à partir d'un matériau (6) choisi dans le groupe constitué par les céréales, le cacao, les graines de tournesol et le riz ou leurs combinaisons, comprenant les étapes suivantes:
    - fournir un broyeur à cylindres de lit de matière (9), comprenant une ouverture d'alimentation (15) et une ouverture d'évacuation (16),
    - un premier rouleau (10) et un deuxième rouleau (11), dans lequel
    au moins un des deux rouleaux (10, 11) est monté mobile dans une direction (s) sensiblement perpendiculaire à la direction de rotation de l'autre des deux rouleaux (10, 11), et
    de sorte que l'espace de broyage (d) entre les premier et deuxième rouleaux (10, 11) est réglable,
    - la mise à disposition d'une masse de matériau (6) en vrac, qui
    est constitué de particules ayant une distribution de taille, une première quantité partielle de la masse en vrac du matériau (6) étant constituée d'une matière broyée plus fine (5) et une deuxième quantité partielle de la masse en vrac du matériau (6) étant constituée d'une matière broyée plus grossière (7);
    - réglage de l'espace de broyage (d) de telle sorte que, lors d'une utilisation conforme, le premier et le deuxième cylindres (10, 11) n'effectuent aucune oscillation l'un par rapport à l'autre, dans lequel:
    la première quantité partielle de la masse en vrac (6) contenant une matière à broyer plus fine (5) forme une masse en vrac de particules tassée dans l'espace de broyage (d) et
    des particules individuelles de la deuxième quantité partielle de la masse en vrac (6) contenant une matière à broyer plus grossière (7) sont en contact avec le premier cylindre (10) et le deuxième cylindre (11) du broyeur à cylindres de lit de matière (9) ;
    - la création d'un lit de matière dans la zone d'alimentation entre les cylindres à partir d'une surabondance de matière, au moyen d'un puits de matière ou d'une trémie (31) remplie, de sorte que les premier et deuxième cylindres (10, 11) puissent aspirer la matière de la zone d'alimentation dans l'espace de broyage (d) ;
    - Broyer le produit en vrac (6) en exerçant une pression sur le premier et le deuxième cylindre (10, 11) en direction de l'espace de broyage (d) du broyeur à cylindres de lit de matière (9) pour fabriquer le produit broyé (17), de sorte que des particules du produit broyé plus fin (5) sont broyées dans l'espace de broyage (d) au moyen d'une masse de particules tassée, tandis que des particules du produit broyé plus grossier (7) sont broyées dans l'espace de broyage (d) par contact direct avec les cylindres (10, 11) ; et
    - l'évacuation du produit broyé (17) par l'ouverture d'évacuation (16),
    dans lequel, à la suite du broyage du produit en vrac (2), le produit broyé (17) est transporté dans un étage de séparation (14) pour être séparé en un produit broyé plus fin (12) et un produit broyé plus grossier (13), et dans lequel le produit broyé (12 ; 13) est ensuite renvoyé dans l'ouverture d'alimentation (15).
  2. Procédé selon la revendication 1, caractérisé en ce que le premier rouleau (10) et le deuxième rouleau (11) tournent à des vitesses différentes, de préférence dans un rapport de vitesse supérieur à 1,1 : 1, de manière particulièrement préférée supérieur à 2 : 1.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'étape de séparation (14) est suivie d'un autre broyeur à cylindres de lit de matière (9) pour la poursuite du broyage du produit de broyage plus fin (12) .
  4. Broyeur à cylindres de lit de matière (9) pour la fabrication de farine (2) et/ou de semoule (3) à partir de matière, en particulier de céréales (1), de cacao, de graines de tournesol et de riz ou de toute combinaison de ceux-ci, comprenant une ouverture d'alimentation (15), une ouverture d'évacuation (16), un premier rouleau (10) et un deuxième rouleau (11), au moins l'un des deux rouleaux (10, 11) étant monté mobile dans une direction (s) essentiellement perpendiculaire à la direction de rotation de l'un des deux rouleaux (10, 11) pour régler un espace de broyage (d) entre les deux rouleaux (10, 11), caractérisé en ce que les cylindres (10, 11) peuvent être bloqués l'un par rapport à l'autre de telle sorte que, lors d'une utilisation conforme aux prescriptions, essentiellement aucune oscillation des cylindres (10, 11) l'un par rapport à l'autre n'est possible, le broyeur à cylindres de lit de matière (9) comprenant en outre un puits de matière ou une trémie (31) pour produire un lit de matière dans la zone d'alimentation entre les cylindres (10, 11), et l'ouverture d'évacuation (16) étant reliée à l'ouverture d'introduction (15) par l'intermédiaire d'un étage de séparation (14) au moyen d'un dispositif de retour (23).
  5. Broyeur à cylindres de lit de matière (9) selon la revendication 4, caractérisé en ce que le broyeur à cylindres de lit de matière (9) ne présente pas de dispositif d'amortissement pour l'amortissement par rapport à une déviation dans la direction (s) du cylindre.
  6. Broyeur à cylindres de lit de matière (9) selon l'une des revendications 4 à 5, caractérisé en ce qu'au moins l'un des deux cylindres (10, 11) est réalisé sous forme de cylindre profilé avec au moins un creux (18) par sections dans la surface du cylindre (19), en particulier sensiblement parallèle à l'axe longitudinal du cylindre profilé, et en ce que le creux (18) par sections est autonettoyant au moins lors de la rotation du cylindre profilé.
  7. Broyeur à cylindres de lit de matière (9) selon l'une des revendications 5 à 6, caractérisé en ce que l'au moins un renfoncement (18) par sections dans la direction circonférentielle du cylindre profilé présente en moyenne une largeur (b) dans la plage de 0,5 mm à 20 mm, de préférence de 2 mm à 10 mm et de manière particulièrement préférée de 4 mm à 6 mm.
  8. Broyeur à cylindres de lit de matière (9) selon l'une des revendications 4 à 7, caractérisé en ce que l'au moins un creux (18) par sections du cylindre profilé présente en moyenne, dans la direction radiale, une profondeur (t) dans la plage de 0,3 mm à 10 mm, de préférence de 0,5 mm à 5 mm et de manière particulièrement préférée de 0,7 mm à 1,8 mm.
  9. Broyeur à cylindres de lit de matière (9) selon l'une quelconque des revendications 4 à 8, caractérisé en ce que la surface de cylindre (19) avec l'au moins une cavité partielle (18) du cylindre profilé le long d'une coupe entre la surface de cylindre et la surface de la cavité qui coupe la surface de cylindre, forme en moyenne un angle intérieur (a) de 100° à 170°, de préférence de 120° à 150° et de manière particulièrement préférée de 130° à 140°.
  10. Broyeur à cylindres à lit de matière (9) selon l'une des revendications 4 à 9, caractérisé en ce que le cylindre profilé présente au moins deux creux (18) par sections, espacés l'un de l'autre dans la direction circonférentielle, qui présentent dans la direction circonférentielle une distance moyenne (k) dans la plage de 0,15 mm à 10 mm, de préférence de 0,15 mm à 5 mm et de manière particulièrement préférée de 0,15 mm à 0,5 mm.
  11. Broyeur à cylindres de lit de matière (9) selon l'une des revendications 4 à 10, caractérisé en ce que l'évidement (18) par tronçon du cylindre profilé présente une portion de surface plane (27), notamment sensiblement perpendiculaire au rayon du cylindre profilé.
  12. Broyeur à cylindres de lit de matière (9) selon l'une des revendications 4 à 11, caractérisé en ce que le premier cylindre (10) et/ou le deuxième cylindre (11) présentent un diamètre (w) dans la plage de 400 mm à 1000 mm et de préférence de 600 mm à 800 mm.
  13. Broyeur à cylindres de lit de matière (9) selon l'une des revendications 4 à 11, caractérisé en ce que
    au moins l'un des deux cylindres (10, 11, 32) comprend un corps de cylindre (42) et au moins un segment de surface (33) réalisé en particulier en section transversale essentiellement en forme de segment annulaire;
    le au moins un segment de surface (33) est destiné à former une surface de cylindre (19), en particulier profilée, du au moins un cylindre (10, 11, 32) et balaye, dans la direction périphérique du corps de cylindre (42), une plage angulaire (m) de 22° à 90°, de préférence de 30° à 45° et de manière particulièrement préférée de 32° à 40°;
    le au moins un segment de surface (33) est fixé de manière amovible au corps de rouleau (42) à l'aide d'un moyen de fixation (35);
    le rouleau (32) comprend un dispositif de transmission de couple (34) pour transmettre le couple du corps de rouleau (42) au segment de surface (33); et
    le corps de rouleau (42) comprend un dispositif d'équilibrage (36), dans lequel
    le dispositif d'équilibrage (36) est réalisé en particulier sous la forme d'un évidement, en particulier d'un alésage, disposé au moins par sections dans le corps de cylindre (42), l'évidement étant disposé sensiblement parallèlement à l'axe longitudinal (21) du corps de cylindre (42), et au moins un poids d'équilibrage pouvant être inséré dans l'évidement.
EP12733664.2A 2011-06-30 2012-07-02 Dispositif et procédé pour produire de la farine et/ou de la semoule Active EP2726208B1 (fr)

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EP11172061A EP2540396A1 (fr) 2011-06-30 2011-06-30 Procédé et dispositif de fabrication de farine et/ou de semoule
PCT/EP2012/062835 WO2013001093A2 (fr) 2011-06-30 2012-07-02 Procédé et dispositif pour la fabrication de farine et/ou de semoule
EP12733664.2A EP2726208B1 (fr) 2011-06-30 2012-07-02 Dispositif et procédé pour produire de la farine et/ou de la semoule

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EP2540396A1 (fr) 2013-01-02
BR112013033839B8 (pt) 2021-08-31
CN103764289A (zh) 2014-04-30
US10933423B2 (en) 2021-03-02
US10099222B2 (en) 2018-10-16
JP2014518154A (ja) 2014-07-28
EP2726208A2 (fr) 2014-05-07
CN103764289B (zh) 2017-03-01
JP2019081173A (ja) 2019-05-30
WO2013001093A3 (fr) 2013-04-11
BR112013033839B1 (pt) 2021-03-16
US20140252141A1 (en) 2014-09-11
RU2014103006A (ru) 2015-08-10
US20190083985A1 (en) 2019-03-21
RU2599837C2 (ru) 2016-10-20
BR112013033839A2 (pt) 2017-02-21

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