EP4554726A2 - Dispositif d'alimentation et laminoir - Google Patents

Dispositif d'alimentation et laminoir

Info

Publication number
EP4554726A2
EP4554726A2 EP23742213.4A EP23742213A EP4554726A2 EP 4554726 A2 EP4554726 A2 EP 4554726A2 EP 23742213 A EP23742213 A EP 23742213A EP 4554726 A2 EP4554726 A2 EP 4554726A2
Authority
EP
European Patent Office
Prior art keywords
conveyor
space
collecting space
conveying
processed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23742213.4A
Other languages
German (de)
English (en)
Inventor
Adrian SCHAFFER
Bruno Fässler
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.)
Swisca AG
Original Assignee
Swisca 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 Swisca AG filed Critical Swisca AG
Publication of EP4554726A2 publication Critical patent/EP4554726A2/fr
Pending legal-status Critical Current

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
    • B02C4/28—Details
    • B02C4/286—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C11/00—Other auxiliary devices or accessories specially adapted for grain mills
    • B02C11/04—Feeding devices
    • 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

Definitions

  • the invention relates to a feeding device for a rolling mill for food processing, for example a roller mill or a flaking mill, and a rolling mill with a feeding device.
  • Roller mills according to the prior art often have a centrally located inlet for the material to be ground.
  • the ground material is stored in a collecting chamber and from there, conveyed through a feed roller, reaches the grinding chamber, where it is crushed between grinding rollers.
  • the axis of the feed roller is generally parallel to the axes of the grinding rollers, and the collecting space extends in a longitudinal direction over the entire length of the feed roller.
  • the collected ground material is distributed over the length of the feed roller, for example by gravity, in that the collecting space is sufficiently large that a cone of material can form, the width of which corresponds to the length of the feed roller.
  • Technical developments mean that roller mills are being manufactured with ever longer grinding rollers and consequently also ever longer feed rollers.
  • the inlet must be constructed higher and higher to ensure a sufficiently wide cone of dumping.
  • this has its limits, which is why gravimetric distribution is no longer sufficient at some point after a certain roller length - depending on the nature of the material to be ground, which defines the angle of the cone of material.
  • the solution known from the prior art is to actively convey the ground material to the outside using a conveyor shaft above the feed roller.
  • the conveyor shaft is driven by the drive of the feed roller.
  • the paddles of such conveyor shafts designed as paddle shafts have an adjustable paddle angle.
  • This solution means that the feeding device can also be suitable for larger roller mills with grinding rollers longer than one meter and/or for products that flow less well.
  • the solution has the disadvantage that the paddles can only be adjusted when the collecting space is empty when operation is interrupted.
  • it is very difficult to find the optimal setting. Therefore, you often have to accept that the distribution over the length of the feed roller is not completely uniform, but that the feed roller conveys less regrind at its outer ends, or that regrind builds up at the ends of the conveyor shaft, which over time increases the risk of Machine defects or permanent non-hygienic grinding material build-up.
  • the feeding device would also have to be continually readjusted. This is rarely done in practice, which is why the feeding device is often operated in a non-optimized mode, with an uneven distribution of the ground material along the length of the rollers.
  • Another disadvantage of the solutions according to the prior art is that paddle shafts with adjustable paddles are potentially unhygienic because they have open threads and screws in the collecting space, i.e. in direct contact with the ground material.
  • EP 3 572 152 therefore proposes a feeding device in which the regrind inlet and a first fill level sensor are attached to one end of the feed roller and the conveyor shaft and a second fill level sensor is attached to the other end of the feed roll and the conveyor shaft.
  • the speed of the conveyor shaft is designed to be adjustable independently of that of the feed roller.
  • This solution is intended to ensure that the feed roll always runs over its entire length is supplied with ground material.
  • it requires relatively complex sensors and a rather complicated control system and depends heavily on the correct functioning of the level sensors; In the event of malfunctions, accumulated ground material must leave the collecting space at the other end through the feed gap. When a disruption is resolved, there is a risk that no product will be discharged for a short period of time.
  • the feeding device also requires adjustments to existing grain mills when installed, as these are generally designed for roller mills with a centrally arranged inlet.
  • Another option is to connect a suction point in the collecting space to the pneumatic delivery line using a corresponding pipe.
  • the pneumatic delivery line - which is often present anyway - is used to transport the ground material away after passing through the grinding gap and after collection through a funnel (trimile).
  • the connection to the pneumatic delivery line avoids the need for a separate aspiration system or, if one is already available for other milling machines, enables a smaller one Dimensioning of this aspiration system and avoids additional pipe construction. However, it requires an additional pipe that is difficult to access for cleaning and maintenance and is also relatively complex.
  • Another task is to provide a uniform, easily controllable feed of processed goods into the processing space (e.g. grinding room) with the processing rollers (e.g. grinding rollers), whereby the feed should be reliable with different properties of the processed goods.
  • Another task is to provide a solution to the aspiration problem.
  • a feeding device for a rolling mill for food processing This points a collection room into which material to be processed can be fed via an inlet.
  • a feed roller serves to convey the processing material present in the collecting space away from the collecting space.
  • it is arranged on the underside of the collecting space and can be rotated about an axis. By rotating, it takes the material to be processed with it and conveys it, in particular through a feed gap, the width of which can be adjustable in a manner known per se, for example by an adjustable slide.
  • the feeding device has a (first) conveyor device for conveying the material to be processed in the collecting space in the axial direction ('axial' is based on the axis of the feed roller) towards at least one end side. It is characterized by a second conveyor device for conveying processed goods conveyed by the first conveyor device in a different direction, away from the end side.
  • the second conveyor device can in particular be set up to convey the processed material conveyed by the first conveyor device in an axial direction opposite to the axial direction (in which the first conveyor device conveys).
  • processed goods generally refers to a food product to be processed in a rolling mill, in particular a grain product, which is in bulk material. If the rolling mill is a roller mill, the processed material is regrind. If the rolling mill is a flaking mill, then the processed material is formed by grains or groats or meal to be blocked.
  • the second conveyor device is therefore arranged in such a way that it conveys processed goods away from the end side, namely within the collecting space. No material can accumulate on the end side, but rather excess material towards the end side Conveyed processed material returns to an area from where it can be picked up by the feed roller or the first conveyor shaft.
  • the second conveyor device will in particular convey processed material conveyed by the first conveyor device back in the direction from which it came. If the feeding device has a central inlet into the collecting space, the conveyance by the first conveyor device takes place in the axial direction towards the sides, away from the center and outwards. The second conveyor device then conveys - depending on the set conveying speed of the first conveyor device - parts of the processed material that was conveyed outwards back inwards.
  • the first conveyor device conveys the material to be processed from the side with the inlet away to the other end side
  • the second conveyor device for example - also depending on the set conveying speed of the first conveyor device - conveys the material to be processed back towards the side towards the inflow.
  • the second conveyor device conveys the material to be processed from the end sides or upwards from the end side, from where it falls back down past the second conveyor due to the effect of gravity, with at least portions of the processed material conveyed upwards also being in Direction can be moved back in the direction from which they came.
  • the product to be processed is prevented from piling up and compressing at the end sides or the end side, and there is also a certain amount of transport back in the direction from which the product to be processed comes from.
  • the problem described at the beginning is solved by the second conveyor device.
  • the first conveyor device can be operated with a conveying capacity that is sufficient in any case, even if the properties of the material to be processed change, and regardless of the presence of air pockets or the like, to safely transport the material to be processed to the outer ends (with a central inlet) or the opposite end (with side inlet).
  • the conveying speed can, for example, only depend on the rotational speed of the feed roller, which inevitably results if - which can be an option - the first conveyor device is driven by the same drive as the feed roller.
  • the first conveyor device can therefore be operated in particular with a conveying capacity that is set slightly too high on average and can therefore convey slightly more processing material than is actually necessary.
  • the second conveyor device then ensures that any processed material that may be conveyed in excess does not accumulate and compact at the end, but is conveyed back and sooner or later distributed along the axis of the feed roller. This approach therefore makes the distribution along the axis of the feed roll very robust and reliable.
  • a further advantage of the approach according to the first aspect of the invention is that the feeding device can be operated with delivery and recovery for a longer period of time when starting until the collecting space is optimally filled and mixed. This is not possible with power supply devices according to the prior art.
  • the second conveyor device is arranged in such a way that it particularly conveys excess portions of the processed material.
  • the second conveyor device can, for example, be arranged above the first conveyor device, that is, directly vertically above or with a horizontally offset, for example parallel, conveyor axis. Depending on the geometry of the collecting space, the second conveyor device can also be in a different position, for example next to the first conveyor device.
  • the first conveyor device can in particular be designed as a conveyor shaft. This is particularly suitable for use in an environment partially filled with the material to be processed, since both ends can be well sealed from the outside and the shaft as a whole does not contain any areas that must not be covered by the material to be processed.
  • Such a conveyor shaft generally has a shaft core (“soul”) with helical conveyor structures present on it. These can be formed by discrete paddles or alternatively by a continuous screw thread. In the latter case, there is also the possibility that the shaft is designed without a shaft core, as a so-called “shaftless” screw conveyor.
  • the second conveyor device can also be a conveyor shaft, which is arranged, for example, horizontally, i.e. with the axis parallel to the axis of the feed roller.
  • the second conveyor device can - with a centrally arranged inlet - also be formed by two separate conveyor shafts on each of the two end sides.
  • the conveying axes of the second conveying device can also be at an angle to the axial direction, for example obliquely or even vertically upwards.
  • Alternative conveying devices are, for example, running belts or rollers, for example belts or rollers running at the front and/or rear at the boundary of the collecting space with conveying structures projecting inwards into the collecting space.
  • Other alternative conveying devices are also not excluded, for example, as an option for the second conveying device, the use of compressed air, through which the material to be processed is blown back inwards from the end sides or the end side above the first conveying device.
  • With a central inlet at least the second conveyor device can be free of conveyor structures in a central area below the inlet.
  • such conveying structures are not necessary in the central area due to the dynamics present in the collecting space, and on the other hand, this makes undesirable compaction of processed material conveyed in the opposite direction in the middle impossible.
  • the second conveyor device for example if it is designed as a horizontal (second) conveyor shaft - is provided with mixing structures in the area below the inlet, which mechanically process the material to be processed that comes into contact with it without systematically feeding it into one or to promote another direction.
  • mixing structures in the area below the inlet, which mechanically process the material to be processed that comes into contact with it without systematically feeding it into one or to promote another direction.
  • Such mixed structures can in particular project radially outwards from the shaft core and protrude from it. They can be formed, for example, by radially extending rods, or by mixed strips - strips or plates that extend parallel to the axis.
  • the second conveyor device is a horizontal (second) conveyor shaft
  • the structures for conveying away from the end side(s) on the second conveyor shaft - for example paddles or a continuous screw thread - are only located near the end side ( n) are present. This leaves enough space for such mixed structures in a central area between the end sides.
  • Mixing structures of the type described efficiently counteract bridging in particularly poorly flowing and/or sticky regrind, mix the inlet product additionally, ensure that the angle of repose is smaller and overall have a positive influence on the product flow by preventing zones with stagnant product .
  • they are designed as mixing strips, they also cause a slightly higher power consumption, which is why they can be available as an option and can be reversibly and detachably attached to the second conveyor shaft, so that they can also be removed if necessary, depending on the material to be ground.
  • mixed structures on the first conveyor device are also an option. These can also be arranged under the inlet.
  • the conveying devices are designed as conveying shafts with a shaft core, in contrast to solutions according to the prior art, the conveying structures - for example paddles - can be firmly connected to the shaft core, for example welded. This results from the fact that, due to the approach according to the first aspect of the invention, a mechanical adjustment of the conveying properties is unnecessary. The described problems with hygiene with open threads and screws in the collecting space can therefore be solved elegantly.
  • At least the first conveyor device has its own conveyor device drive that is independent of the drive of the feed roller on.
  • the conveying speed of the conveyor device(s) can be adjusted independently of the feed roller, even during operation.
  • the feeding device can therefore in particular be equipped so that an adjustment of the delivery rate through the first conveyor device and, for example, also through the second conveyor device is possible without emptying the collecting space.
  • An independent drive for example, has its own electric motor that is separate from the electric motor of the feed roller drive.
  • the independent conveyor drive can have a single electric motor that drives the first conveyor and possibly also the second conveyor, for example via belts, gears or other elements. It can also have an electric motor for each of the first and second conveying devices.
  • the feeding device is of the “narrow inlet” type, which means that the collecting space is designed in an upper region in the form of a chamber with a circumferential wall that is open downwards towards the conveying devices.
  • the width (the extent in the axial direction) is significantly smaller than the axial length of the feed roller and the Funding institutions.
  • the “axial length” of the feed roller and the conveying devices is always the expansion inside the collecting space, excluding the parts of the roller or shafts (or other means) that penetrate the boundary of the collecting space and serve to store and attach the drive.
  • the chamber-like area - in embodiments it can be essentially box-shaped, with a rectangular floor plan - is referred to as the “upper partial collection room”.
  • the lower partial collection room adjoins the upper partial collection room at the bottom and, in addition to a front and rear boundary (wall and/or door, each with a window if necessary) and side boundaries, also has an upper boundary on the side of the upper partial collection room on.
  • This upper limit can be essentially horizontal, or it can be slightly inclined to the horizontal, for example by an angle of inclination of a maximum of 10°, a maximum of 7° or a maximum of 5°.
  • Embodiments of this type have, among other things, the advantage that, compared to feeding devices with a collecting space that is wide at the top, simpler and better control of the filling quantity in the collecting space is possible.
  • the mixing of different processed goods is improved compared to feeding devices with a wide bulk material cone.
  • the controllability of the fill level and the reliable transport of the processed material along the entire length of the feed roller are more demanding than with a wide collecting space, which is why the procedure according to the invention, especially with independent drive of the conveying devices, is particularly suitable for such embodiments.
  • the maximum width of the upper partial collection space results from the space available, as is usually available in grain mills, as well as from the requirement discussed below that the collection space be sealed downwards by the processed material during normal operation so that operations can be easily regulated.
  • the width - measured at the widest point of the upper partial collecting space - can be, for example, a maximum of 50 cm, a maximum of 45 cm or a maximum of 40 cm. As a rule, it will definitely be smaller than half the axial length of the feed roll.
  • the circumferential wall of the upper partial collecting space can be vertical or at least partially slightly inclined to the vertical, for example with a maximum angle of inclination of 10°, 7° or 5°.
  • a rolling mill for example a roller mill
  • a feeding device of this type with an upper partial collecting space and a lower partial collecting space has at least one aspiration channel between the upper partial collecting space and the processing room with the processing rollers.
  • the aspiration channel is a gas-carrying line that can have a round, rectangular or otherwise designed cross-section, which does not have to be constant along the channel.
  • one or more of the aspiration channels can be guided along the circumferential wall of the upper sub-collection space and from there lead further down into the processing space, for example along a rear wall of the lower sub-collection space.
  • the at least one aspiration channel can end in particular above the pair of processing rollers.
  • the solution with aspiration channel, which connects the upper part of the collection room with the processing room connects above the processing rollers can be particularly favorable: if the aspiration channel were to end below the pair of processing rollers, the pressure resistance would at best be too high. If the aspiration channel begins below the upper partial collecting space, there is a risk of blockage.
  • the aspiration channel ensures that, during operation, air constantly flows from the inlet and the upper sub-collection chamber, where there is excess pressure, to the processing chamber, in which there is negative pressure due to the suction and pneumatic conveyance of the material to be processed. So internal aspiration takes place. Firstly, by connecting the upper sub-collection space with the processing space, clogging of the aspiration channel can be prevented very efficiently. Secondly, this always ensures during operation that no significant amount of air and the fine processing material entrained with it can flow along any paths past the feed roller from the collecting space into the processing space.
  • the approach according to the second aspect of the invention may also allow the system to be locked with the doors closed (for example grinding room door; possibly door into the collecting room). This also prevents moisture or spores etc. from getting into the area with the processed goods in an uncontrolled manner.
  • the rolling mill according to the second aspect is operated in particular in such a way that the material to be processed always seals the upper part of the collecting space from below, ie in normal operation the material to be processed always occupies the entire cross-sectional area at least at the bottom of the upper part of the collecting space. Therefore, no significant amount of air can pass through the feed gap or through any leaks, for example on the sides, past the slide from the collecting space into the flow into the processing room and carry away processing material in an uncontrolled manner.
  • the at least one aspiration channel according to the second aspect of the invention takes this circumstance into account without having to accept the disadvantages of external aspiration.
  • the feeding device of the rolling mill can have a level monitor.
  • the fill level determined by this - i.e. the level of the material to be processed in the collecting space - can be taken into account by the control in order to control the rotational speed of the feed roller and/or the conveying capacity of the conveying device(s). Additionally or alternatively, the filling level can also serve to control the amount of processed material supplied, for example via an inlet slide, an inlet flap or another metering device.
  • third aspect of the present invention which can be combined particularly well with the first and/or second aspect, has a feeding device with a narrow inlet, that is to say with an upper partial collecting space with a surrounding wall and a lower partial collecting space with at least one Conveying device (for example with two conveying devices, if the feeding device also corresponds to the first aspect) has a viewing window, which is not only present on the circumferential wall of the upper sub-collection space, but extends downwards into a cover of the lower sub-collection space.
  • the viewing window has a width that is greater than the width of the upper partial collecting space.
  • the viewing window can extend axially close to the end sides of the lower sub-collection space.
  • “close to the end sides” means that the ends of the collecting space extending through the lower sub-collection space Conveyor device(s) are clearly visible through the viewing window, which can mean, for example, that the viewing window extends on both sides to the end sides or ends laterally at a distance of at most approx. 10 cm from the end sides.
  • the viewing window can be continuous or divided. However, any subdivision should not, for example, prevent all areas of the collection room from being visible up to the lower limit of the viewing window.
  • the viewing window which, in contrast to the prior art, not only makes the narrow area below the inlet (the upper partial collecting space) visible, but also the area with the conveyor device or devices, allows a visual assessment of the product distribution, product quality and the product mixing in the feeding device. Because the viewing window extends from the upper part of the collecting space to the lower part of the collecting space, it allows a good assessment of the product flow through the feeding device. Any malfunctions, contamination, mold formation, etc. can also be seen through the viewing window without having to interrupt operation and open the collection room.
  • the viewing window can be hinged so that the collecting space is easily accessible in the event that a malfunction, contamination, the onset of mold or similar is detected.
  • the rolling mill in the form of a roller mill can be designed as a multiple roller mill, with a plurality of pairs of grinding rollers, the two pairs being arranged one behind the other and therefore being at least approximately at the same height.
  • the Roller mill can be designed in such a way that the upper part of the collecting space is free of transport pipes passing through it. Any transport tubes that may be present can be guided between the pairs of grinding rollers and between the feed rollers assigned to them, as well as conveying devices on the side of the upper partial collecting space (which can be divided into two compartments, each for the front and the rear pair of grinding rollers).
  • the collection space including any aspiration channels running to the side, is no more than approximately 55 cm, which is very compatible with the dimensions discussed above for the width of the upper part of the collection space.
  • Fig. 1 a representation of a power supply device
  • Fig. 2 is a cross-sectional view of the feeding device of Fig. 1;
  • Fig. 3 shows an alternative power supply device
  • Fig. 4 shows the feeding device according to Fig. 3, together with transport pipes and with the fill level of the material to be processed;
  • Fig. 5 is a diagram with the control
  • Fig. 6 shows a roller mill with an aspiration channel
  • Fig. 7 is a view from above of a double roller mill with a narrow inlet
  • FIG. 18 shows a cross-sectional view, analogous to FIG. 2, of an alternative embodiment of the feeding device.
  • Fig. 19 schematically shows a first and second conveyor device with mixing strips.
  • FIGS. 1 and 2 show a power supply device 1 according to a first embodiment.
  • the feeding device On the top side, the feeding device has an inlet 11, shown only schematically in FIG. 1, and a collecting space 12 formed by a housing 2.
  • the collecting space 12 is closed at the bottom by a feed roller 14, which cooperates with an adjustable slide 15 to convey the material to be processed in the collecting space through a feed slot 16 so that it reaches the processing space (grinding space), where it is crushed between grinding rollers.
  • the inlet 11 is located centrally (with respect to axial directions) above the feed roller 14 and the conveyor shafts 17, 18, which will be described in more detail below.
  • the inlet can have one or more nozzles to which lines with the fed Processed goods can be coupled. Due to the central arrangement of the inlet, the material to be processed must be distributed outwards in the axial direction for an even distribution in the grinding gap (not shown in FIGS. 1 and 2). To a certain extent, this happens by accumulating a cone of processed material under the inlet 11. However, this is generally not enough, which is why the processed material is actively conveyed in the axial direction for better axial distribution.
  • the feeding device has a first conveying device, namely a first conveying shaft 17 for conveying the material to be processed in the axial direction outwards, i.e. from a central area 31 below the inlet in two opposite directions, as indicated by the double arrows.
  • a first conveying device namely a first conveying shaft 17 for conveying the material to be processed in the axial direction outwards, i.e. from a central area 31 below the inlet in two opposite directions, as indicated by the double arrows.
  • paddles 19 - or other supporting structures for example structures that run helically at least in some areas - are each oriented in opposite directions in two outer areas, i.e. arranged in a mirror image, for example.
  • the feeding device has a second conveying device, namely a second conveying shaft 18 for conveying the material to be processed in the opposite axial direction, i.e. back inwards.
  • the second conveyor shaft 18 is arranged above the first conveyor shaft, so that it mainly captures portions of the material to be processed which would otherwise accumulate from the ends of the first conveyor shaft 17, i.e. axially outside.
  • the second conveyor shaft 18 is arranged above the first conveyor shaft 17, but is also slightly offset horizontally, namely to the rear (see Fig. 2).
  • Such a slightly offset arrangement has the advantage that the vertical distance between the conveyor shafts can be somewhat smaller than if the two conveyor shafts were arranged directly vertically one above the other.
  • a reduced vertical distance which is, for example, a little smaller than the sum of the radii of the paddles 19, can be advantageous because it can be particularly effective in preventing sideways accumulation of processed goods.
  • the conveyor structures (paddle 19), as indicated in FIG.
  • Paddles 19, as are present as conveyor structures on both conveyor shafts 17, 18, are known per se.
  • they convey the material to be processed in the intended direction by pushing it in front of them or, depending on the speed of rotation, by giving it an impulse in the intended conveying direction.
  • the paddles 19 - or other, for example, partially helically extending conveyor structures, for example worm threads - can be firmly welded to the actual shaft or otherwise attached to it, which solves the hygiene problems described above.
  • the upper conveyor shaft 18 and in the illustrated embodiment also the lower conveyor shaft 17 has a central area 31 without a paddle 19. There is therefore no funding of processed goods in this central area.
  • the conveyor shafts 17, 18 have a conveyor shaft drive 21, which is independent of the feed roller drive 22 in that it has its own electric motor.
  • the first conveyor shaft 17 and the second conveyor shaft are coupled to one another or to the conveyor shaft drive 21, that, driven by the conveyor shaft drive 21, they always rotate at a fixed speed ratio, for example of 1: 1 (ie at the same speed).
  • the conveyor shafts could be driven by the drive of the feed roller, for example via appropriate belts.
  • the first conveyor shaft 17 and the second conveyor shaft 18 each have their own drive and their rotational speeds can be set independently.
  • Fig. 1 also illustrates the conveyor shaft supply unit 23 separately from the feed roll supply unit 24; In reality, the supply units can optionally also be integrated into a common electronics unit.
  • the feeding device also has a fill level monitor, which in the illustrated embodiment is formed by a radar sensor 27, as taught in Swiss patent application 448/2022 dated April 14, 2022.
  • a fill level monitor which in the illustrated embodiment is formed by a radar sensor 27, as taught in Swiss patent application 448/2022 dated April 14, 2022.
  • Other level monitors which determine the level, for example by means of a capacitive sensor, a weight measurement and/or optically and/or in some other way, are also an option.
  • FIG 3 illustrates an alternative embodiment, which differs from that of Figures 1 and 2 in the shape of the collecting space 12.
  • the collecting space 12 is divided into a chamber-like upper partial collecting space 41 with a circumferential, approximately vertical wall 51 and a lower partial collecting space 42 extending along the entire length of the feed roller.
  • the upper partial collecting space can have the shape of a box with an approximately rectangular floor plan or an approximately circular or slightly elliptical floor plan exhibit.
  • the inlet 11 opens into the upper partial collecting space 41 in the form of at least one line - generally there are several, for example four, lines, for which the housing 2 each has a nozzle or the like - into the upper partial collecting space 41.
  • the width (axial extent) of the upper The partial collecting space is significantly smaller than the axial extent of the feed roller 14.
  • the lower partial collecting space 42 in addition to a front and rear boundary and side boundaries 52, also has a horizontal upper boundary 53, which is located on the side of the first partial collecting space 41 and under certain circumstances also located in front of and/or behind the upper sub-collection room.
  • a viewing window 44 is arranged and dimensioned so that it is not only present on the circumferential wall 51 of the upper sub-collection space, but also extends downward into the cover of the lower sub-collection space 42, so that at least the upper conveyor shaft 18 is visible through the window.
  • the viewing window can be at least partially vertical or approximately vertical.
  • the viewing window extends axially to close to the end sides of the lower sub-collection space, i.e. essentially to positions which correspond to the axial ends of the conveyor shafts 17, 18 and the feed roller 14 (more precisely: the axial ends of that part of the conveyor shafts/feed roller , which comes into contact with the processed goods).
  • a conveyor shaft drive 23 that is independent of the feed roller drive 22 is particularly advantageous. It has been shown that, particularly in these embodiments, the best results are achieved when the speed ratio of the feed roller and conveyor shaft(s) is not constant, but can be adapted to the material to be processed and, if necessary, other parameters.
  • Figure 4 illustrates further optional features of a feeding device with an upper partial collecting space 41 and a lower partial collecting space 42 with at least one conveyor shaft 17, 18.
  • the viewing window is not indicated for illustrative reasons, but there is a viewing window with the above
  • the properties described can also be considered as an option for devices with the features described with reference to FIG.
  • Fig. 4 shows that the peripheral wall of the chamber, which forms the upper sub-collection space 41, does not necessarily have to be vertical, but can be slightly inclined to the vertical.
  • the angle of inclination oc of at least part of the circumferential wall i.e. one of the side walls, front or rear walls, can in particular be between 0° and a few degrees, for example it can be between 0° (vertical) and 10°, in particular between 0° and 7° or between 0° and 5°.
  • at least one wall - or two opposing walls for example, as illustrated in FIG. 4, the two side walls or the front and rear walls) can be inclined towards the vertical.
  • a slight inclination of at least one area of the surrounding wall can be advantageous in order to prevent so-called bridges of processed goods, through which larger air pockets can form inside the processed goods - even if these are generally unproblematic due to the active conveyance of processed goods by the conveying devices.
  • Fig. 4 illustrates transport tubes 71 leading through the roller mill. These are used to transport processed goods or other goods between devices and/or storage locations of the grain mill and do not necessarily have to be connected to the roller mill in question.
  • transport pipes can transport the processed material away, for example pneumatically, after it has passed through the roller mill.
  • Roller mills are often manufactured as multiple roller mills (four-roller mills or with pairs of rollers arranged one above the other as eight-roller mills). For reasons of space, it is often necessary for transport pipes to be guided through the roller mill - regardless of whether the transport pipes are used to remove processed material from the relevant roller mill or only connect other elements of the grain mill. Since the collecting space extends further back in the upper area (see Fig. 2, in which the front is on the right in the figure), according to the prior art, a solution often has to be found in which the transport pipes are guided through the collecting space itself or this must be restricted by notches or similar for the transport pipes. This is often structurally unsatisfactory. Measures discussed in the present text enable embodiments in which transport pipes are arranged in the axial direction next to the upper partial collecting space 41 and therefore do not affect the collecting space.
  • the width of the upper partial collecting space 41 can be chosen so that even with a smallest roller length of 1 m, there is still space on both sides for two inlet pipes with a pipe diameter of, for example, 95 mm each, which is why the width b of the upper partial collecting space at the bottom, for example, a maximum of approximately 550 mm, for example a maximum of approximately 500 mm and in particular without any aspiration channels passing laterally on the actual upper sub-collection space 41 is a maximum of approximately 450 mm.
  • Fig. 4 illustrates the principle that the material to be processed always seals the volume in the upper part of the collecting space from below by the material to be processed always occupies the entire cross-sectional area at least at the bottom of the upper partial collecting space.
  • the feeding device or the system in which the rolling mill with the feeding device is embedded is set up to always regulate the fill level 61 of the material to be processed accordingly during operation.
  • the opening angle o of the cone varies depending on the material being processed and has a value of between 90° and 120°.
  • the control see Fig.
  • the criterion can also result from this that the width b of the upper partial collecting space 41 is a maximum of approximately 500 mm, in particular a maximum of approximately 450 mm.
  • Figure 5 illustrates the control 81, which can correspond to the control of the entire roller mill (the same applies to another rolling mill), and which can be integrated into the control of an entire system or connected to it via suitable communication channels.
  • the control receives signals from the radar sensor 27 - and/or one or more other sensors for level detection - and controls the conveyor shaft drive 21 and the feed roller drive 22 and, under certain circumstances, also influences the flow of the material to be processed, which is shown in Fig. 5 is shown as an optional control of an inlet slide 85.
  • the control takes place in such a way that the condition described above is met, according to which the material to be processed always seals the volume towards the inlet from the bottom, for which the separate conveyor shaft drive 21 is advantageous.
  • the speed of the grinding rollers can also be controlled accordingly (grinding roller drive 82).
  • a User interface 84 enables the input and/or output of information and commands by or to a user, for example a manual influence on the speeds of the feed roller and/or the conveyor shafts.
  • Fig. 5 also illustrates the option of adjusting the feeding gap in a motorized and controlled manner (feeding gap setting 83 via the adjustable slide 15), with the feeding gap being adjusted mechanically in many embodiments and when the feeding device is at a standstill, but with the feeding gap also being adjusted during operation may be possible.
  • the rotational speeds of the conveyor shafts and/or the feed roller are automatically adjusted depending on a fill level measured by the radar sensor 27, the sensor, the control and the drives of the conveyor shafts and/or the feed roll form a control loop, with the fill level of the material to be processed as - for example. adjustable setpoint.
  • Figure 6 shows a roller mill as an example of a rolling mill and, in addition to the feed device 1, also shows a grinding chamber 93 with a pair of grinding rollers 91, between which the grinding gap 92 is formed, into which the processed material conveyed by the feed roller 14 reaches.
  • aspiration channels can also be considered, which are guided along the side of the upper sub-collection space and, for example, on the back of the lower sub-collection space.
  • Figure 7 illustrates very schematically a view of a double roller mill with a “narrow” inlet, ie with a feeding device as shown in Figures 3 and 3 -TI-
  • the inlet 11 has connections for four pipes.
  • an aspiration channel 93 runs on both sides along the side walls of the upper partial collection space.
  • the dashed line represents a division between a front and a rear compartment of the upper partial collecting space, whereby the processed material is already in the upper partial collecting space between a portion for the front pair of grinding rollers (in Fig. 7, for example in the lower half of the roller mill). and is divided for the rear pair of grinding rollers (in Fig. 7, for example in the upper half of the roller mill).
  • the aspiration channels run below the upper partial collecting space between the lower partial collecting spaces for the two pairs of grinding rollers and the associated feed rollers and conveyor shafts.
  • the transport tubes 71 which do not necessarily belong to the roller mill, also run between the lower partial collecting spaces for the two pairs of grinding rollers and the associated feed rollers and conveyor shafts.
  • FIG. 8 schematically illustrates the possibility of providing the second conveyor device - here the second conveyor shaft 18 - with mixing structures, i.e. structures that move and mix the material to be processed without systematically conveying it in one or the other axial direction. They can be formed, for example, by rods that protrude outwards from the shaft core, or by any other structures that are suitable for a mixing process. These mixed structures are present in a central area below the inlet. The same possibility also exists for the first conveyor device (first conveyor shaft 17).
  • mixing structures i.e. structures that move and mix the material to be processed without systematically conveying it in one or the other axial direction. They can be formed, for example, by rods that protrude outwards from the shaft core, or by any other structures that are suitable for a mixing process. These mixed structures are present in a central area below the inlet.
  • first conveyor device first conveyor shaft 17
  • the second conveyor device can be in several parts, namely in Fig. 9 two parts, with a second conveyor shaft on both sides, the second conveyor device being interrupted in the area below the inlet.
  • the drive takes place in Fig. 9 - with the help of suitable transmission means, for example at least one belt - by the conveyor shaft drive 21.
  • Figure 11 illustrates the possibility that the second conveyor shaft or the second conveyor shafts 18 do not run axially, but at an angle to the axis of the feed roller and the first conveyor shaft.
  • the second conveyor shafts are vertical, so that they convey the processed material conveyed to the end sides upwards, from where it can fall laterally downwards again and be picked up again by the first conveyor shaft or passed on through the feed gap and in any case not can accumulate at the end.
  • Figure 12 shows schematically the possibility that the second conveying means are not formed by a conveying shaft, but by a periodically moving plunger 118, which pushes the material to be processed inwards.
  • Figure 13 shows, as a further possibility, a second conveying means in the form of a pivoting plate 119, which also moves accumulating processed material.
  • a compressed air nozzle is used as the second conveying means, which blows processing material that accumulates at the end inwards.
  • Figure 15 illustrates very schematically the possibility that the second conveying means is present as a second conveying shaft 18, but this is not arranged above (and/or to the side) of the first conveying shaft, but rather as a “shaftless” (or “soulless”) screw conveyor , which can accommodate the first conveyor shaft in its interior - that is, the screw conveyor can be approximately coaxial with the first conveyor shaft.
  • Figure 16 also shows very schematically a roller 122 with conveyor structures, which can be arranged vertically or horizontally in order to convey processed material stored at the end away from the end side.
  • FIG. 17 illustrates a circulating belt with conveyor structures, which can be arranged, for example, in such a way that it engages on one side (above the dotted line in FIG. 17, for example) in the area above the first conveyor device, while it runs back in an area ( in the example below the dotted line in Fig. 17), in which there is no contact with the material to be processed.
  • Figure 18 shows an embodiment of the collecting space 12, which differs from the design according to FIG. 2 in that the rear wall of the collecting space forms a shoulder 121 at the narrowest point - directly above the feed roller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Crushing And Grinding (AREA)

Abstract

L'invention concerne un dispositif d'alimentation (1) conçu pour un laminoir destiné au traitement d'aliments, qui comporte un espace de collecte (12) dans lequel un produit à traiter peut être amené par une entrée (11). Un cylindre d'alimentation (14) sert à évacuer le produit présent dans l'espace de collecte (12) hors de l'espace de collecte. Le cylindre est disposé à cet effet sur le côté inférieur de l'espace de collecte (12) et peut tourner autour d'un axe. Le dispositif d'alimentation présente au-dessus du cylindre d'alimentation un premier dispositif de transport (17) pour transporter le produit à traiter dans l'espace de collecte dans la direction axiale. Le dispositif d'alimentation est caractérisé par un deuxième dispositif de transport (18) pour transporter le produit à traiter transporté par le premier dispositif de transport dans une direction différente de la direction de transport du premier dispositif de transport. Ainsi, une répartition particulièrement régulière des produits à traiter le long de l'axe du cylindre d'alimentation (14) est garantie.
EP23742213.4A 2022-07-12 2023-07-11 Dispositif d'alimentation et laminoir Pending EP4554726A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH000830/2022A CH719887A1 (de) 2022-07-12 2022-07-12 Speisungsvorrichtung und Walzwerk.
PCT/EP2023/069203 WO2024013179A2 (fr) 2022-07-12 2023-07-11 Dispositif d'alimentation et laminoir

Publications (1)

Publication Number Publication Date
EP4554726A2 true EP4554726A2 (fr) 2025-05-21

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EP23742213.4A Pending EP4554726A2 (fr) 2022-07-12 2023-07-11 Dispositif d'alimentation et laminoir

Country Status (5)

Country Link
US (1) US20260008060A1 (fr)
EP (1) EP4554726A2 (fr)
CN (1) CN119816374A (fr)
CH (1) CH719887A1 (fr)
WO (1) WO2024013179A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH720512A1 (de) 2023-02-16 2024-08-30 Swisca Ag Walzenpaket und Walzenstuhl
CN121198444B (zh) * 2025-11-28 2026-02-24 陕西恒田生物农业有限公司 用于农药生产的气流粉碎机控制方法及系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1007568B (it) * 1973-01-24 1976-10-30 Buehler Ag Geb Telaio per rulli con un dispositivo di alimentazione e con un condotto di immissione pneumatico
FR2320780A1 (fr) * 1975-08-13 1977-03-11 Siraga Dispositif d'alimentation d'un broyeur a cylindres
ES2824761T3 (es) * 2018-05-25 2021-05-13 Buehler Ag Dispositivo de distribución-dosificación para un molino de cilindros, molino de cilindros con un dispositivo de distribución-dosificación de este tipo y procedimiento para moler material a moler

Also Published As

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WO2024013179A3 (fr) 2024-03-07
CN119816374A (zh) 2025-04-11
WO2024013179A2 (fr) 2024-01-18
US20260008060A1 (en) 2026-01-08
CH719887A1 (de) 2024-01-31

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