EP3990189A1 - Broyeur à cylindres et procédé permettant de faire fonctionner un broyeur à cylindres - Google Patents

Broyeur à cylindres et procédé permettant de faire fonctionner un broyeur à cylindres

Info

Publication number
EP3990189A1
EP3990189A1 EP20735298.0A EP20735298A EP3990189A1 EP 3990189 A1 EP3990189 A1 EP 3990189A1 EP 20735298 A EP20735298 A EP 20735298A EP 3990189 A1 EP3990189 A1 EP 3990189A1
Authority
EP
European Patent Office
Prior art keywords
grinding
roller
grinding roller
measuring device
roller mill
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.)
Granted
Application number
EP20735298.0A
Other languages
German (de)
English (en)
Other versions
EP3990189B1 (fr
Inventor
Frank Schroers
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.)
FLSmidth AS
Original Assignee
ThyssenKrupp Industrial Solutions 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 ThyssenKrupp Industrial Solutions AG filed Critical ThyssenKrupp Industrial Solutions AG
Publication of EP3990189A1 publication Critical patent/EP3990189A1/fr
Application granted granted Critical
Publication of EP3990189B1 publication Critical patent/EP3990189B1/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
    • B02C4/28—Details
    • B02C4/40—Detachers, e.g. scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • 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
    • 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
    • B02C4/305—Wear resistant 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
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/02—Features for generally used wear parts on beaters, knives, rollers, anvils, linings and the like

Definitions

  • the invention relates to a roller mill with edge elements for comminuting granular material, as well as a method for operating a roller mill.
  • Roller mills are usually used to crush grist, such as limestone, clinker or similar rocks.
  • grist such as limestone, clinker or similar rocks.
  • edge elements For controlled influencing of the lateral outflow of ground material from a grinding gap formed between the grinding rollers of a roller mill, it is known to arrange edge elements on one of the grinding rollers.
  • Such a roller mill with edge elements is known, for example, from DE 20 2014 006 837 U1.
  • An increased specific grinding pressure acts on the edge elements, which leads to a heavy load on the edge elements and thus often to wear or breakage of the edge elements.
  • a roller mill for comminuting granular material comprises a first grinding roller and a second grinding roller which are arranged opposite one another and can be driven in opposite directions, a grinding gap being formed between the grinding rollers. At least one of the grinding rollers has an edge element at an end region of a grinding roller end which is designed such that it extends over the grinding gap and at least partially covers the opposite grinding roller at the end.
  • a scraper element for removing material is arranged on the end region of the end of the grinding roller which is provided with an edge element. The scraper element is used in particular for at least partial removal of material deposited on the end region of the grinding roller.
  • the material is scraped off by the scraper element when the roller mill is in operation, with the grinding rollers rotating in opposite directions.
  • the scraper element is preferably arranged at the end region of the grinding roller in such a way that it does not touch the grinding roller.
  • the end area of the grinding roller includes, for example, the end face of the grinding roller, the grinding roller surface adjoining it, and an area surrounding the grinding roller surface in which material is deposited.
  • such a region has a height of more than or equal to 2 mm to 10 mm, in particular more than or equal to 4 mm to 8 mm, preferably 5 mm.
  • the edge element comprises in particular a circumferential circular ring, preferably a circular disk.
  • the edge element is attached to the end face of the respective grinding roller, for example screwed or welded.
  • An end-side gap is preferably formed between the edge elements and the end face of the respective opposing grinding roller.
  • a gap at the end prevents the edge element from colliding with the end area of the respective opposing grinding roller in the event of the grinding rollers running incorrectly, the opposing grinding rollers not being arranged parallel to one another.
  • the grinding rollers include, in particular, a basic roller body, the edge element being detachably connected to the basic roller body of the respective grinding roller.
  • the grinding roller preferably comprises a drive shaft for driving the grinding roller, on which the roller base body is arranged.
  • a detachable arrangement of the edge elements on the roller body offers the advantage of a quick and easy exchange of the edge elements in the event of wear.
  • the edge elements are, for example, glued, soldered, welded or screwed onto the basic roller body and preferably have wear protection.
  • the wear protection is arranged on the inner surface of the edge element facing in the direction of the grinding gap.
  • Such wear protection includes, for example, a wear-resistant coating such as build-up welding, Wear protection elements or wear protection coatings.
  • the edge elements are preferably made of steel.
  • this wear protection layer is thicker at the end regions of the roller ends, which are provided with edge elements, than on the other regions of the grinding rollers. This leads to an increased grinding pressure by which the edge elements are more heavily loaded and wear out or fail more frequently.
  • the scraper elements By means of the scraper elements, the material build-up at the grinding roller ends on the edge elements is reliably prevented. This minimizes the risk of increased wear and failure of the edge elements.
  • the roller mill according to the invention has a measuring device for determining the layer thickness of ground material on at least one of the grinding rollers and / or for determining the load on the edge element. Furthermore, the roller mill has a control device which is connected to the measuring device and is designed to reduce or increase the distance between the scraper element and the grinding roller as a function of the determined layer thickness and / or load.
  • the control device comprises, for example, a computer and is preferably connected to the measuring device in such a way that the data determined by means of the measuring device, such as the load and / or the layer height of the ground material on the grinding roller, are transmitted to the control device.
  • the load includes, for example, the forces acting on the edge element or the relative expansion of the edge element.
  • the scraper element is preferably arranged at a distance from the edge element and / or the end region of the grinding roller.
  • the distance between the scraper element and the edge element and / or the end region of the grinding roller is preferably more than or equal to 2 mm -10 mm, in particular 4 mm to 8 mm, preferably 5 mm.
  • a distance between the scraper element and the edge element and / or the end region of the grinding roller prevents the scraper element from coming into contact with the grinding roller and thus reduces the wear on the scraper element.
  • the wiper element is arranged in such a way that the distance between the wiper element and the edge element and / or between the wiper element and the end region of the grinding roller can be adjusted.
  • the thickness of the material layer should be at the end regions of the grinding rollers do not exceed a certain value of, for example, 2 to 10 mm, in particular 4 to 8 mm, preferably 5 mm.
  • An adjustable distance ensures that when the scraper element is worn, the distance between the scraper element and the edge element and / or the end region of the grinding roller is kept constant.
  • the service life of the wiper element is extended and replacement is not necessary in the event of wear.
  • Each of the grinding rollers preferably has an edge element at an end region of a roller end, which is designed such that it extends over the grinding gap and at least partially covers the opposite grinding roller at the end.
  • the edge elements are arranged diagonally opposite one another with respect to the end regions of the grinding rollers.
  • the wiper element extends in particular along an edge element.
  • the scraper element extends in the radial direction of the grinding roller, for example parallel or at an angle to the edge element.
  • the distance between the edge element and the stripping element is preferably constant over the length of the stripping element.
  • the scraper element is attached to a holder, the holder being designed to be movable in the direction of the grinding roller.
  • the holder extends essentially in the radial direction of the grinding roller.
  • the holder preferably comprises a spindle or telescopic rod, each of which can be driven, for example, by means of an electric motor or manually by means of a hand wheel, so that the holder is moved in the direction of the grinding roller or away from the grinding roller.
  • the holder can preferably be moved linearly.
  • the wiper element is preferably detachably attached to the holder, for example by means of screws.
  • the roller mill has a first measuring device for determining the layer height of ground material on the grinding roller and a second measuring device for determining the load on the edge element.
  • the first measuring device is preferably attached to a machine frame which is stationary relative to the rotating grinding rollers.
  • the first measuring device is arranged such that it determines the layer height of the ground material on the grinding roller during the rotation of the grinding roller at its upper turning point.
  • the scraper elements are preferably arranged at a position in the direction of rotation of the grinding roller in front of the upper turning point.
  • the second measuring device is for example attached to the edge element.
  • the roller mill preferably has two of the first and the second measuring device, a second measuring device being attached to each edge element and a first measuring device being attached to each end region of a grinding roller provided with an edge element.
  • the first and the second measuring device are preferably each connected to the control device for transmitting the determined measurement data. The majority of the measuring devices are used to reliably monitor each edge element of the roller mill.
  • the first measuring device is an optical measuring device, in particular a laser measuring device, infrared measuring device or an electromagnetic measuring device, such as a radar measuring device (microwaves in the range of 1-300 GHz).
  • the measuring method is understood to mean both the optical measuring method, the laser measuring method and the radar measuring method.
  • the measuring device is, for example, attached at a known distance from the surface of the grinding roller, preferably above the grinding roller.
  • the layer height is preferably determined in a lateral edge area of the grinding roller by means of an optical measuring method or radar measurement.
  • a surface area is recorded which extends, for example, over the entire width and length of the grinding roller or only over a part of the grinding roller, for example the end area.
  • the surface of the ground material on the grinding roller is recorded over an area and, for example, the highest value of the layer height is determined in this area.
  • a plurality of measuring devices are provided, which are attached over the circumference above the surface of the grinding roller, for example evenly spaced from one another, in order to preferably detect a surface area of the grinding roller and to determine the layer height in this area, preferably flat.
  • the height of the grist is determined at a large number of individual, mutually spaced measuring points, from which a 2D image of the grist surface is determined, for example by means of interpolation.
  • the measuring methods for determining the layer height are a simple and reliable way of determining the layer height while the roller mill is in operation.
  • the second measuring device comprises a strain gauge.
  • the second measuring device comprises a plurality of strain gauges, preferably 2, 4, 6, 8 or 10 strain gauges.
  • strain gauges are circumferentially uniform on the edge element Attached to each other at a distance.
  • a strain gauge is attached to a screw, by means of which the edge element or a segment of the edge element is connected to the basic roller body.
  • the strain gauge determines the relative expansion or compression of the area on which it is attached, from which the stresses occurring thereon, in particular the forces acting on the edge elements and / or the screws, are determined.
  • the control device is designed in such a way that it reduces the distance between the scraper element and the grinding roller when the layer height exceeds a predetermined limit value.
  • the limit value is, for example, 2mm to 10mm, in particular 4mm to 8mm, preferably 5mm.
  • the distance is preferably increased if the layer height falls below the limit value determined in advance. If the layer height exceeds the limit value determined in advance, it can be concluded that the wiper element is worn.
  • the limit value is preferably stored in the control device. When the distance is reduced, the worn area of the wiper element is compensated for. Likewise, if the distance is increased, excessive wear of the wiper element is counteracted.
  • the distance is to be understood in particular as the distance between the scraper element and the surface of the basic roller body, in particular the grinding surface of the grinding roller.
  • control device is designed such that it reduces the distance between the scraper element and the grinding roller when the load, in particular the elongation of the edge element, exceeds a predetermined limit value.
  • the distance is preferably increased by means of the control device when the load, in particular the relative expansion of the edge element, falls below the predetermined limit value.
  • the measuring device is arranged between the scraper and the grinding gap in the direction of rotation of the grinding roller. The function of the scraper is thereby monitored, the layer thickness being determined at a location where no further material is pressed onto the roller.
  • the scraper element is preferably arranged in such a way that it removes material that has accumulated on the edge element and / or on the end region of the grinding roller during operation of the roller mill away.
  • the scraper element is arranged to be stationary or movable relative to the rotatable grinding rollers, so that the grinding rollers rotate relative to the scraper element.
  • the roller mill has a stationary machine frame and the scraper element is attached to the machine frame.
  • the machine frame comprises, for example, several frame elements that are connected to bearing blocks of the grinding rollers, so that the grinding force acting on the grinding rollers is transmitted to the machine frame.
  • a machine frame of a roller mill comprises a frame element which extends essentially in the axial direction of the grinding rollers and to which the scraper element is preferably attached. The scraper element extends from the machine frame in the direction of the grinding roller, in particular in the end region of the grinding roller.
  • the roller mill has at least two scraper elements which are arranged at end regions of different roller ends of the grinding roller.
  • the scraper elements are preferably arranged at opposite end regions of a grinding roller.
  • Each scraper element is preferably attached to a respective holder which is attached movably in the direction of the grinding roller.
  • the wiper element has a wiper plate which is formed from a wear-resistant material such as tungsten carbide.
  • the stripping plate is arranged on the end of the stripping element facing the grinding roller and is in contact with the material to be stripped off when the roller mill is in operation. The stripper plate is therefore exposed to a high level of wear, with a wear-resistant material extending the life of the stripper plate.
  • the wiper element has an arm to which the wiper plate is detachably attached.
  • the stripping plate is clamped or screwed to the arm.
  • the stripping plate preferably protrudes over the arm in the direction of the grinding roller.
  • the invention also comprises a method for operating a roller mill for comminuting granular material with a first grinding roller and a second grinding roller, which are arranged opposite one another and can be driven in opposite directions, a grinding gap being formed between the grinding rollers and at least one of the grinding rollers at one end region of a
  • the grinding roller has an edge element which is designed in such a way that it extends over the grinding gap and at least partially covers the end face of the opposite grinding roller, with a scraper element for at least partial removal of material being arranged on the end region of the grinding roller provided with an edge element, the method has at least the step:
  • Adjustment of the distance between the scraper element and the grinding roller as a function of the determined layer height and / or load.
  • the material is preferably removed at two end regions of the grinding roller each provided with an edge element. According to a further embodiment, the distance is reduced if the determined layer height exceeds a limit value determined in advance. According to a further embodiment, the distance is reduced if the load exceeds a predetermined limit value.
  • FIG. 1 shows a schematic representation of a section of a roller mill in a top view according to an exemplary embodiment.
  • FIG. 2 shows a schematic illustration of a section of a roller mill in a top view according to a further exemplary embodiment.
  • FIG. 3 shows a schematic representation of a section of a grinding roller with scraper elements in a perspective view according to an exemplary embodiment.
  • FIG. 4 shows a schematic illustration of a wiper element in a perspective view according to an exemplary embodiment.
  • FIG. 5 shows a schematic illustration of the wiper element of FIG. 4 in a perspective rear view.
  • FIG. 1 shows a roller mill 10 with a first grinding roller 12 and a second grinding roller 14, each of which has an essentially cylindrical roller base.
  • the grinding rollers 12, 14 are arranged opposite one another and can be driven in opposite directions.
  • a grinding gap 16, which extends in the axial direction, is formed between the grinding rollers 12, 14.
  • the grinding rollers 12, 14 are arranged almost parallel to one another, so that the grinding gap 16 extending between the grinding rollers 12, 14 has an almost constant width.
  • Each of the grinding rollers 12, 14 furthermore has a drive shaft 30, 32 which extends along the central axis through the respective grinding roller 12, 14 and which drives the grinding rollers to rotate about their central axis.
  • the first and the second grinding roller 12, 14 have the same diameter, wherein the first grinding roller 12 is longer than the second grinding roller 14 can be.
  • the grinding rollers 12, 14 each have a first end region 24, 28 and a second end region 22, 26, which are arranged at opposite ends of the grinding roller.
  • the first end area 24 of the first grinding roller 12 is arranged opposite the first end area 28 of the second grinding roller 14, the second end area 22 of the first grinding roller 12 being arranged opposite the second end area 26 of the second grinding roller 14.
  • the first grinding roller 12 has, for example, two edge elements 18, 20 which are each attached to an end region of the grinding roller 12.
  • the first edge element 18 is attached to the first edge area 22 of the first grinding roller 12 and extends in the radial direction over the grinding gap 16 so that it partially covers the end face of the second grinding roller 14 at the first end area 26.
  • the second edge element 20 is at the second end region ok
  • An end gap 34, 36 is formed between the edge elements 18 and the respective end face of the second grinding roller 14.
  • the edge elements 18, 20 preferably each include a circumferential circular ring which, for example, can also consist of segments and is attached to the respective grinding roller 12, 14 in a manner not shown.
  • the edge elements 18, 20 are attached to the end face or to the outer circumference of the grinding roller, in particular the respective roller base body.
  • the edge elements 18, 20 are made of a wear-resistant material such as steel, and have a wear-resistant coating or a plurality of, for example, plate-shaped wear protection elements on the inside facing the grinding gap 16.
  • the edge elements 18, 20 have a thickness of 10 mm to 100 mm, for example, and cover the opposing grinding rollers 12, 14 by about 2-20%, in particular 4-10%, preferably 3-6% of the roller diameter.
  • FIG. 2 shows a further embodiment of a grinding roller with edge elements 18, 20, the grinding roller essentially corresponding to the grinding roller shown in FIG. 1 with the difference that in the exemplary embodiment of FIG. 2 each of the grinding rollers 12, 14 has one edge element 18 , 20 has.
  • the first and second grinding rollers 12, 14 have the same diameter and the same length and are of essentially identical design.
  • the edge elements 18, 20 are arranged diagonally opposite one another in relation to the end regions 22-28 of the grinding rollers 12, 14.
  • the first grinding roller 12 has an edge element 18 at its first end area 24, which extends in the radial direction over the grinding gap 16 and partially covers the end face of the second grinding roller 14 at the first end area 28.
  • the second grinding roller 14 has an edge element 20 at its second end area 26, which extends in the radial direction over the grinding gap 16 and partially covers the end face of the first grinding roller 12 at its second edge area 22.
  • the second edge element 20 is arranged in relation to the first edge element 18 on the diagonally opposite end region 26 of the second grinding roller 14.
  • the grinding rollers 12, 14 are arranged offset in the axial direction, so that between the first edge element 18 and the end face of the second Grinding roller 14, a first front-side gap 34 is formed and a second front-side gap 36 is formed between the second edge element 20 and the front side of the first grinding roller 12.
  • the first and the second end gap 34, 36 each extend in the radial direction.
  • FIG. 3 shows a section of a first grinding roller 12 of the roller mill 10 according to FIG.
  • the edge elements 18, 20 include, for example, a plurality of partially circular segments which are each screwed onto the end face of a respective end region of the grinding roller 12. Each segment is attached to the face of the grinding roller 12 with a plurality of screws or bolts.
  • the 3 also shows two scraper elements 42, 44 which are each attached to a holder 38, 40 and each extend in the direction of a respective end region of the grinding roller 12.
  • the filters 38, 40 are preferably each fastened to a machine frame (not shown), the grinding rollers 12, 14 in particular being mounted on the machine frame.
  • the scraper elements 42, 44 are arranged at a distance from the grinding roller 12 and the edge element 18, 20 of the grinding roller 12, so that the scrapers do not touch the grinding roller 12 and the edge elements 18, 20.
  • the first scraper element 42 is attached in such a way that it lies opposite the first end region 22 of the grinding roller 12, the first scraper element 42 extending in the radial direction of the grinding roller 12 along the first edge element 18 and being oriented essentially parallel to it.
  • the second scraper element 44 is arranged in a corresponding manner on the second end region 24 and the second edge element 20 of the grinding roller 12.
  • the scraper elements 42, 44 each extend along the surface of the edge elements 18, 20 facing inward in the axial direction of the grinding roller 12.
  • the scraper elements 42, 44 are, for example, of identical design.
  • the filterings 38, 40 are preferably designed such that they can be moved in and / or against the direction of the grinding roller 12, so that when the filtering 38, 40 is moved in or against the direction of the grinding roller, the distance between the grinding roller, in particular the surface the grinding roller 12, 14 and the scraper element 42, 44 is decreased or increased.
  • the filterings 38, 40 are preferably linearly movable in the direction of the grinding roller 12, 14 or away from the grinding roller 12, 14.
  • the filters 38, 40 are for example around a telescopic rod or a spindle, which can preferably be driven by means of an electric motor, not shown, or manually by means of a handwheel.
  • the 3 also shows a first measuring device 62 for determining the layer thickness of the grist adhering to the surface of the grinding roller.
  • the first measuring device 62 is, for example, an optical measuring device, the layer thickness being determined, for example, by means of a laser.
  • the first measuring device 62 is preferably arranged such that the layer thickness of the ground material is determined at an end region of the grinding roller 12, 14, in particular in the vicinity or on one of the edge elements 18, 20.
  • the first measuring device 62 is preferably attached behind the stripper element 42, 44 in the direction of rotation of the grinding roller 12, so that the layer thickness is determined circumferentially between the stripper element 42, 44 and the grinding gap 16 during operation of the roller mill 10.
  • the direction of rotation of the grinding roller 12 is shown in FIG. 3 with an arrow.
  • the first measuring device 62 is attached, for example, to the machine frame described above and is arranged in a stationary manner relative to the rotatable grinding rollers 12, 14.
  • the roller mill 10 also has a second measuring device 64, which is attached to an edge element 18, 20 and is designed such that it determines the load acting on the respective edge element 18, 20.
  • a load is to be understood as meaning, for example, the force acting on the edge element 18, 20 and / or the stresses occurring in the respective edge element 18, 20.
  • the second measuring device 64 is, for example, one or a plurality of strain gauges.
  • the strain gauge is attached to the edge element 18, 20 in order to determine the stresses occurring in the edge element, in particular the forces acting on the edge element. It is also conceivable to attach a plurality of strain gauges at different positions on the edge element 18, 20.
  • one or a plurality of screws for fastening the edge element 18, 20 to the roller base body of the grinding roller 12, 14 are each provided with a strain gauge.
  • the second measuring device 64 is preferably arranged in the direction of rotation of the grinding roller 12, 14 behind the scraper element 42, 44 and in front of the grinding gap 16.
  • the roller mill 10 further comprises a control device 66 for setting the distance between the scraper element 42, 44 and the surface of the grinding roller 12, 14.
  • the control device 66 is connected to the first and / or the second measuring device 62, 64 connected in such a way that the data determined by means of the respective measuring device 62, 64 are transmitted to the control device 66.
  • the control device 66 is also connected to the holder 38, 40, preferably with both holders 38, 40 of the wiper elements 42, 44.
  • the control device 66 is connected to an electric motor which moves the mountings 38, 40 of the scraper elements 42, 44, preferably in the direction of the grinding roller 12, 14 or away from the grinding roller 12, 14.
  • the control device 66 is connected to the brackets 38, 40 and / or the electric motor in such a way that it can move the brackets by means of a control signal for movement in the direction of the grinding roller 12, 14 or away from the grinding roller 12, 14.
  • FIG. 3 only shows the arrangement of the stripping elements 42, 44 on a roller mill according to FIG.
  • a roller mill 10 shown in FIG. 2 likewise has two scraper elements 42, 44, for example.
  • Each grinding roller 12, 14 of the roller mill 10 shown in FIG. 2 has a scraper element 42, 44, which is attached, for example, to a roller frame and, according to the embodiment of FIG. 3, extends in the direction of a respective end region of the Grinding roller 12, 14 extends.
  • a first measuring device 62 is attached to each end region of the grinding roller and a second measuring device 64 is attached to each edge element 18, 20.
  • Control device 66 connected.
  • the control device 66 compares, for example, the measured values transmitted by the first and / or the second measuring device 62, 64 with a corresponding previously determined limit value. For example, the control device 66 compares the value of the layer height of the ground material on the grinding roller 12, 14 transmitted by means of the first measuring device 62 with a previously determined limit value of the layer height that is stored in the control device 66.
  • the control device 66 is preferably designed and set up in such a way that it reduces the distance between the respective scraper element 42, 44 and the surface of the respective grinding roller 12, 14 when the determined layer height of the previously determined limit value is exceeded.
  • the control device 66 transmits, for example, a control signal to the electric motor or to the brackets 38, 40, so that the brackets 38, 40 and the scraper elements 42, 44 fixedly attached to them move in the direction of the grinding roller 12, 14, in particular in the direction of the Grinding roller surface, are moved and the distance between the scraper elements 42, 44 and the surface of the grinding roller 12, 14 is reduced.
  • the previously determined limit value for the layer height is, for example, 2mm to 10mm, in particular 4mm to 8mm, preferably 5mm.
  • the control device 66 is preferably designed and set up such that it increases the distance between the respective scraper element 42, 44 and the surface of the respective grinding roller 12, 14 when the determined layer height falls below the previously determined limit value.
  • An increased layer thickness of ground material on the grinding roller 12, 14 indicates wear of the scraper element 42, 44, with a reduction in the distance between the scraper element 42, 44 and the surface of the grinding roller corresponding to a wear readjustment of the scraper element 42, 44, so that the wear of the Stripper elements 42, 44 is compensated.
  • control device 66 compares the value of the load transmitted by means of the second measuring device 64, preferably the expansion of the edge elements 18, 20 and / or the forces acting on the edge elements 18, 20 and / or the screws, with a previously determined limit value of the respective load , preferably the elongation that is stored in the control device 66.
  • the control device 66 is preferably designed and set up in such a way that it reduces the distance between the respective scraper element 42, 44 and the surface of the respective grinding roller 12, 14 when the determined load, in particular the elongation, the predetermined limit value is exceeded. This is preferably done as described above.
  • the control device 66 is preferably designed and set up in such a way that it reduces the distance between the respective scraper element 42, 44 and the surface of the respective grinding roller 12, 14 if the determined load, in particular the elongation, falls below the predetermined limit value.
  • FIG 4 shows an enlarged view of an exemplary wiper element 42, 44.
  • the wiper element 42, 44 has a fastening plate 46 which is attached to the holder 38, 40 in the assembled position of the wiper element 42, 44.
  • the fastening plate has a plurality of fastening holes 48 which are used to fasten the wiper element 42, 44 to the holder 38, 40, for example by means of screws.
  • An arm 50 is attached to the fastening plate 46, which arm is, for example, at an angle of approximately 30-60 °, in particular approximately 45 °, to the fastening plate 46 in the direction of not illustrated grinding roller 12, 14 extends.
  • a stripping plate 52 is attached to the arm 50 and is fastened to the arm 50 by means of two screws 54 and a clamping plate 56.
  • the stripping plate extends parallel to the arm 50 beyond the end of the arm facing away from the fastening plate 46, so that the stripping plate 52 protrudes on the arm 50 in the radial direction of the grinding roller 12, 14.
  • the stripping plate 52 is clamped between the clamping plate 56 and the arm 50, so that it can be easily replaced in the event of wear.
  • the stripping plate 58 is arranged in a clamping receptacle 58, which is arranged between the clamping plate 56 and the arm 50 and is clamped by means of the clamping plate 56 and the screws 54.
  • the front edge of the stripping plate 52 extends in the embodiment of FIG. 4 at an angle to the surface of the respective grinding roller 12, 14, so that the distance between the stripping plate 52 and the surface of the grinding roller 12, 14 in the direction of the grinding roller end is smaller.
  • the angle between the stripping plate 52 and the surface of the grinding roller 12, 14 is 45 ° -135 °, for example. It is also conceivable that the front edge of the
  • Stripping plate 52 extends essentially parallel to the surface of the respective grinding roller 12, 14, in particular in the axial direction of the grinding roller.
  • the side surface of the stripping plate 52 and the side surface of the arm 50 extend along the respective edge element 18, 20.
  • the fastening plate 46, the arm, the clamping receptacle 58 and the clamping plate 56 are formed from steel, for example.
  • the stripping plate is formed, for example, from a highly wear-resistant material such as tungsten carbide.
  • FIG. 5 shows a rear view of the wiper element 42, 44 of FIG. 4.
  • the arm 50 has, for example, an essentially U-shaped profile, the clamping plate 56 and the clamping receptacle 58 being attached to the arm 50 by means of screws 54 and nuts.
  • the edge elements 18, 20 prevent material from escaping laterally from the grinding gap 16.
  • An autogenous wear protection is built up on the surface of the grinding rollers 12, 14 through the deposition of material.
  • the scraper elements 42, 44 scrape off deposited material at the end regions of the grinding roller 12, 14 and thus ensure that the autogenous wear protection layer even in the end regions of the grinding rollers 12, 14 to which the edge elements are attached, does not rise above a certain thickness, so that the edge elements are reliably protected from high pressure from deposited material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

L'invention concerne un broyeur à cylindres (10) pour fragmenter du matériau granulaire, qui comporte un premier cylindre de broyage (12) et un deuxième cylindre de broyage (14) qui sont disposés de manière à se faire face et peuvent être entraînés en sens inverse. Une fente de broyage (16) est réalisée entre les cylindres de broyage (12, 14). Au moins un des cylindres de broyage (12, 14) comporte, sur une zone d'extrémité (22, 24, 26, 28) du cylindre de broyage (12, 14), un élément de bord (18, 20) qui est réalisé de manière à s'étendre au-dessus de la fente de broyage (16) et qui recouvre au moins en partie côté frontal le cylindre de broyage (12, 14) faisant face. Un élément racleur (42, 44) prévu pour retirer au moins en partie du matériau est disposé sur la zone d'extrémité (22, 24, 26, 28), pourvue d'un élément de bord (18, 20), du cylindre de broyage (12, 14). Le broyeur à cylindres comporte un dispositif de mesure (62, 64) pour déterminer l'épaisseur de couche du produit à broyer sur au moins un des cylindres de broyage (12, 14) et/ou pour déterminer la charge de l'élément de bord (18, 20) et un dispositif de commande (66), qui est relié au dispositif de mesure (62, 64) et est réalisé pour réduire ou augmenter la distance de l'élément racleur (42, 44) par rapport au cylindre de broyage (12, 14) en fonction de l'épaisseur de couche et/ou de la charge déterminée.
EP20735298.0A 2019-06-28 2020-06-23 Broyeur à rouleaux et procédé de fonctionnement d'un broyeur à rouleaux Active EP3990189B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019209514.3A DE102019209514A1 (de) 2019-06-28 2019-06-28 Walzenmühle und Verfahren zum Betreiben einer Walzenmühle
PCT/EP2020/067540 WO2020260307A1 (fr) 2019-06-28 2020-06-23 Broyeur à cylindres et procédé permettant de faire fonctionner un broyeur à cylindres

Publications (2)

Publication Number Publication Date
EP3990189A1 true EP3990189A1 (fr) 2022-05-04
EP3990189B1 EP3990189B1 (fr) 2023-04-26

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EP20735298.0A Active EP3990189B1 (fr) 2019-06-28 2020-06-23 Broyeur à rouleaux et procédé de fonctionnement d'un broyeur à rouleaux

Country Status (12)

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US (1) US20220250081A1 (fr)
EP (1) EP3990189B1 (fr)
AU (2) AU2020303222B2 (fr)
BR (1) BR112021026639A2 (fr)
CA (1) CA3145149C (fr)
CL (1) CL2021003506A1 (fr)
DE (1) DE102019209514A1 (fr)
DK (1) DK3990189T3 (fr)
FI (1) FI3990189T3 (fr)
PE (1) PE20220325A1 (fr)
WO (1) WO2020260307A1 (fr)
ZA (1) ZA202200463B (fr)

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US20220288598A1 (en) * 2021-03-10 2022-09-15 Metso Outotec USA Inc. Spur wheel scraper
US11612895B2 (en) * 2021-06-23 2023-03-28 Metso Outotec USA Inc. Grinding roll and a grinding assembly comprising the grinding roll
US11925942B2 (en) * 2021-10-22 2024-03-12 Metso Outotec USA Inc. Roller crusher and method for operating thereof
US20230127300A1 (en) * 2021-10-22 2023-04-27 Metso Outotec USA Inc. Roller crusher and method for arrangement thereof
US20230129456A1 (en) * 2021-10-22 2023-04-27 Metso Outotec USA Inc. Roller crusher and method for operating thereof
AU2021477689A1 (en) * 2021-12-07 2024-07-18 Indurad Gmbh Roller machine with a radar monitoring unit, radar monitoring unit for a i roller machine and a method hereto
US11938488B2 (en) 2021-12-09 2024-03-26 Metso Outotec USA Inc. Roller crusher and method for operation thereof

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DE457037C (de) * 1928-03-06 Bergedorfer Maschinenfabrik Vo Walzwerk zum Aufbereiten von Ton oder anderen breiigen oder koernigen Massen mit an den Stirnseiten der Walzen liegenden Abschlussplatten fuer den Walzenspalt
US5054701A (en) * 1989-06-20 1991-10-08 Fives-Cail Babcock Milling process and apparatus
DE202014006837U1 (de) 2014-08-27 2014-09-08 Thyssenkrupp Ag Mahlwalze für eine Walzenmühle, sowie eine Walzenmühle
DE102017208014A1 (de) * 2017-05-11 2018-11-15 Thyssenkrupp Ag Walzenmühle und Verfahren zum Betreiben einer Walzenmühle

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CL2021003506A1 (es) 2022-10-07
AU2023274122A1 (en) 2023-12-21
EP3990189B1 (fr) 2023-04-26
BR112021026639A2 (pt) 2022-03-03
CA3145149A1 (fr) 2020-12-30
US20220250081A1 (en) 2022-08-11
AU2020303222B2 (en) 2023-08-31
ZA202200463B (en) 2022-10-26
DE102019209514A1 (de) 2020-12-31
DK3990189T3 (da) 2023-05-30
CA3145149C (fr) 2023-10-17
PE20220325A1 (es) 2022-03-14
FI3990189T3 (fi) 2023-05-22
WO2020260307A1 (fr) 2020-12-30
AU2020303222A1 (en) 2022-02-10

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