EP4106925A1 - Broyeur et procédé pour le faire fonctionner - Google Patents

Broyeur et procédé pour le faire fonctionner

Info

Publication number
EP4106925A1
EP4106925A1 EP21704178.9A EP21704178A EP4106925A1 EP 4106925 A1 EP4106925 A1 EP 4106925A1 EP 21704178 A EP21704178 A EP 21704178A EP 4106925 A1 EP4106925 A1 EP 4106925A1
Authority
EP
European Patent Office
Prior art keywords
grinder
gar
gtl
grinding table
grinding
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
EP21704178.9A
Other languages
German (de)
English (en)
Other versions
EP4106925B1 (fr
Inventor
Bruno Back
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.)
Flender GmbH
Original Assignee
Flender GmbH
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 Flender GmbH filed Critical Flender GmbH
Publication of EP4106925A1 publication Critical patent/EP4106925A1/fr
Application granted granted Critical
Publication of EP4106925B1 publication Critical patent/EP4106925B1/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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/10—Mills with balls or rollers centrifugally forced against the inner surface of a ring, the balls or rollers of which are driven by other means than a centrally-arranged member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/006—Ring or disc drive gear arrangement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • 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

Definitions

  • the invention relates to a grinder with a grinding table rotatable about a first axis of rotation, comprising at least two grinding rollers, each rotatable about a second axis of rotation in such a way that grist can be comminuted between the grinding table and the grinding rollers during operation.
  • the invention also relates to a method for operating the grinder.
  • the grinder include at least one sensor arrangement, by means of which a change in the inclination of the grinding table beyond a certain threshold value can be detected.
  • EP 2221 129 A1 a grinder of the type defined at the outset are known in which a computational conclusion on the arrangement of the grinding table is made from measurements on a roller suspension. If the underlying assumptions are not met, serious damage can occur or unwanted downtimes can occur. This is the case, for example, with problems with the grist.
  • the US 5191 713 A deals with measurements of Verkip pitch in general.
  • Industrial grinders of the type defined at the outset in particular vertical mills which are used, for example, in cement grinding, comprise a grinding table which is set in rotation via a drive.
  • a grinding table which is set in rotation via a drive.
  • several grinding rollers distributed around the circumference press on the grinding table, which grind the ground material applied to the grinding table.
  • the grinding table rotates around a first axis of rotation and the grinding rollers each rotate around a second axis of rotation. If the weight of the grinding rollers is not sufficient for the grinding of the ground material, a force is applied to the grinding rollers, usually hydraulically, so that the grinding table is evenly loaded by all grinding rollers.
  • the pressure and transverse forces naturally occurring in the grinding process are absorbed by the bearing of the grinding table.
  • Such a storage is usually designed as a sliding bearing, the storage is often part of the Ge gear that sets the grinding table in rotation.
  • the contact pressure of the individual grinding rollers is unequal, for example caused by a technical malfunction in the hydraulics of the grinding rollers or in the system control in a cement mill, for example, the storage of the Mahltel lers is claimed in addition to the pressure forces with a tilting moment. Since the bearing of the grinding table can only absorb compressive and transverse forces, the grinding table can tilt in such cases and the bearing of the grinding table, e.g. an axial plain bearing and / or the gear unit of a vertical mill below the grinding table, can be damaged.
  • the invention had set itself the task of detecting a tilting of the grinding table at an early stage and thus preventing any damage to the grinder.
  • a grinder of the type defined at the beginning with the additional features of the characterizing part of independent claim 1 is proposed.
  • the invention proposes a method for operating a grinder according to the method claims.
  • the dependent claims from each contain advantageous developments of the invention.
  • the grinder according to the invention is preferably a vertical grinder, the first axis of rotation in this case having a preferably essentially vertical orientation. shows.
  • a grinder according to the invention has at least two grinding rollers which are each rotatably arranged about a second axis of rotation in such a way that the ground material between the grinding table and peripheral surfaces of the grinding rollers can be reduced in size during operation.
  • the grinding rollers have an essentially cylindrical or conical shape of grinding surfaces which are in rolling engagement with the grinding table or the material to be ground.
  • the multiple grinding rollers each have their own second axis of rotation, the second axis of rotation not being conceptually differentiated for the individual grinding rollers, since apart from the respective alignment and circumferential position, these do not have any fundamental differences from one another.
  • the second axes of rotation here each have an essentially obtuse angle to the first axis of rotation, a right angle in particular also being conceivable.
  • the cone angle is preferably related to the angle between the first and the second axis of rotation that a substantially linear support between the grinding plate and Grinding roller is created.
  • grinder and mill are essentially used synonymously here.
  • the sensor arrangement according to the invention which detects a change in inclination of the grinding table above a certain threshold value, makes it possible to prevent serious damage to slide bearings or other bearings of the grinding table and adjacent components in grinding mechanisms according to the invention, in particular vertical mills. Accordingly, long production downtimes and costly repairs are avoided.
  • the determination according to the invention of a change in the inclination of the grinding table enables the tilting of the grinding table to be separated from any translational movements. genes that are generally unproblematic for the operation of the grinding table bearings.
  • the determination that a certain threshold value has been exceeded with regard to the change in inclination of the grinding table enables an early warning to be issued in the event of tilting, so that, for example, problems in the oil supply to the bearings can be precisely distinguished from tilting of the grinding table as a result of unequal loading.
  • the grinder comprises a controller and at least one man-machine interface, the controller being connected to the man-machine interface and the sensor arrangement, and the controller being designed in such a way that a warning is issued by means of the Man-machine cut parts can be displayed as soon as a change in the inclination of the grinding table above the specific threshold value is detected by the sensor arrangement.
  • the operating personnel can use this warning to decide immediately whether the grinder should be stopped and the cause of any tilting must be determined.
  • the grinding table of the grinder is mounted by means of roller bearings, with mounting by means of plain bearings being preferred, particularly preferably by means of tilting segment plain bearings.
  • the sensor arrangement comprises sensors which are designed as vortex sensors, buttons, optical sensors or capacitive sensors. It is useful here if the sensor arrangement comprises at least three displacement sensors. In a particularly advantageous manner, these displacement sensors can measure a change in position or a change in position against a bearing surface of the grinding table, the arrangement of these displacement sensors preferably being in the form of a triangle. Particularly expediently, the control with the sensor arrangement determines a tilt angle from the measurements of the sensor arrangement, which indicates the angular deviation of the actual first axis of rotation from the target orientation of the first axis of rotation.
  • control determines the direction of the tilt from the measurements of the sensor arrangement, so that the circumferential position of the lowest or highest point due to the tilt can be displayed on the display device.
  • the method according to the invention for operating a grinder comprises the operation of the grinder, measuring variables that enable the tilting of the grinding table to be determined from a target position, comparing a change in the inclination of the grinding table with a specific threshold value, Output of a warning by means of a human-machine interface that the change in inclination of the grinding table has reached or exceeded the specific threshold value.
  • the change in the inclination of the grinding table basically relates to a change in the alignment of the first axis of rotation of the grinding table.
  • a tilt angle is determined by means of the control unit, which indicates the angular deviations of the current first axis of rotation from the target orientation of the first axis of rotation. Furthermore, outputting the tilt angle on a display device of the grinder or by means of the man-machine interface is particularly advantageous.
  • This indication of the tilt angle enables the operating personnel of the grinder to quickly take measures to turn off the impermissible tilting and to resume operation of the grinder.
  • a further acceleration of the possibly necessary maintenance work enables an advantageous embodiment of the method in which the direction of the tilt is determined so that the circumferential position of the lowest point or the highest point due to the tilting can be displayed on the display device.
  • the invention is described in greater detail below using a special exemplary embodiment. Show it:
  • Figure 1 is a schematic longitudinal section through a grinder according to the invention
  • Figure 2 shows a section according to II-II shown in the figure
  • FIG. 3 a perspective schematic representation of the grinding table, the sensor arrangement and the bearing of the grinding table
  • FIG. 4 shows a schematic representation of the geometrical relationships between the grinding table, the tilting and the sensor arrangement
  • FIG. 5 shows a schematic flow diagram of the method for operating a grinder according to the invention.
  • FIG. 1 shows a schematic representation of a longitudinal section of a detail of a grinder according to the invention GAR.
  • the grinder GAR comprises a grinding table GTL that can be rotated about a first axis of rotation RX1 and at least two grinding rollers GRL, which are each arranged to be rotatable about a respective second axis of rotation RX2.
  • the grist GRM is crushed between the GTL grinding table and the GRL grinding rollers during operation.
  • the respective individual second axes of rotation RX2 of the individual grinding rollers GRL each form an obtuse angle with the first axis of rotation RX1 of the grinding table GTL, which can also be right-angled.
  • the grinding rollers GRL are designed with conical grinding surfaces.
  • the second axes of rotation RX2 are accordingly oriented at an angle to the first axis of rotation RX1.
  • the GTL grinding table is axially equipped with BEA bearings, which are designed as plain bearings SBE and here as tilting pad bearings TPB.
  • the grinding table GTL is set in rotation about the vertical first axis of rotation RX1 by means of a drive (not shown) by means of a drive shaft DRS.
  • the drive shaft DRS is supported by means of radial bearings RBE on a stator STA in such a way that the first axis of rotation RX1 is aligned vertically.
  • sensors DS1, DS2, DS3 of a sensor arrangement SNA which determines a tilting of the grinding table GTL to a control CPU connected to the sensor arrangement SNA.
  • sensors DS1, DS2, DS3 are preferably located near the axially acting bearing BEA, so that the sensors DS1-DS3 can measure against the bearing surface of the grinding table GTL.
  • the sensors are designed as displacement sensors, so that a change in distance between the stator STA and the Mahltel ler GTL is detected by the sensors. If the sensors DS1-DS3 measure different distances, it can be assumed that the first axis of rotation RX1 deviates from the original target position in the manner of a change in the inclination of the grinding table GTL.
  • Figure 4 shows the method for determining the tilt angle of the grinding table Q and the azimuth angle f, the tilt by means of the controller CPU.
  • the control CPU first determines the coordinates of the points on the circumferential plain bearing running surface SBS of the grinding table GTL that were detected by the sensor arrangement SNA.
  • the sensor arrangement SNA the sensor arrangement
  • the coordinates x 0ABC , yo , A , B , cr denote the constructively defined position of the sensor in a fixed card Tesian coordinate system of any origin, the z-axis of which coincides with the first axis of rotation RX1 of the grinding table GTL in the untilted state.
  • the coordinates si (t) correspond to the measured values of the displacement sensors DS1, DS2, DS3.
  • the tilt of the GTL grinding table is calculated using the normal vector of the plane that corresponds to the rotating running surface of the plain bearing. The normal vector of this plane is determined by forming the cross product between the connecting vectors Xzf and ⁇ C:
  • 0 (t) arccos arccos (n (t) e) where denotes the unit vector in the z-coordinate direction.
  • the direction in which the grinding table GTL tilts can be described using the azimuth angle f, which describes the angle to the x-axis in the XY plane. This can be set via arctan y> 0 arctan y ⁇ 0
  • a so-called orbit plot can be used for the graphic visualization of the two parameters.
  • the normal vector of the plane is projected onto the XY plane.
  • the tilting of the grinding table can thus be visualized for diagnosis.
  • FIG. 5 shows a schematic flow diagram of the method for operating a grinder according to the invention according to the invention.
  • the GAR grinder is put into operation. Men commissioning (1)) and then or at the same time the measurement of variables (2)) begins, which enable the determination of a tilting of the grinding table GTL from a target position. On the basis of these measurements (2)) there is a comparison (3)) of a change in inclination of the grinding table GTL with a certain threshold value TRS.
  • the control CPU particularly preferably determines a tilt angle Q from the measurements of the sensor arrangement SNA, whose sensors DS1,
  • DS2 and DS3 each provide distances between the stator STA and the grinding table GTL. If the change in inclination Q des
  • a warning ALR (4) is output by means of a man-machine interface HMI that the inclination change Q of the grinding table GTL has reached or exceeded the certain threshold value TRS.
  • the warning can be output both on a visual display device DSP or on an acoustic display device ACA as a warning ALR.
  • the cycle of comparison 3 is repeated on the basis of the measurements of the sensor arrangement SNA and the evaluation of the control CPU and, if necessary, an ALR warning is repeatedly output.
  • the tilt angle Q is particularly preferably output on the display device DSP of the grinder GAR.
  • An advantageous development also includes the determination of the direction of the tilt F, so that the circumferential position of the lowest point or the highest point due to the tilt can be displayed on the display device DSP.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Crushing And Grinding (AREA)

Abstract

L'invention concerne un broyeur (GAR) pourvu d'un plateau de broyage (GTL) pouvant tourner autour d'un premier axe de rotation (RX1) et comprenant au moins deux cylindres broyeurs (GRL) qui sont chacun agencés de manière à pouvoir tourner autour d'un deuxième axe de rotation (RX2) respectif de telle sorte que la matière à broyer peut être broyée entre le plateau de broyage (GTL) et les cylindres broyeurs (GRL) pendant le fonctionnement. L'invention concerne par ailleurs un procédé pour faire fonctionner ce broyeur (GAR). Selon l'invention, pour augmenter la disponibilité, le broyeur (GAR) comprend au moins un dispositif de détection (SNA) permettant de détecter une modification de l'inclinaison du plateau de broyage (GTL) au-delà d'une valeur seuil déterminée (TRS).
EP21704178.9A 2020-02-18 2021-01-19 Mécanisme de broyage, procédé de fonctionnement Active EP4106925B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20158007.3A EP3868476A1 (fr) 2020-02-18 2020-02-18 Mécanisme de broyage, procédé de fonctionnement
PCT/EP2021/051058 WO2021164970A1 (fr) 2020-02-18 2021-01-19 Broyeur et procédé pour le faire fonctionner

Publications (2)

Publication Number Publication Date
EP4106925A1 true EP4106925A1 (fr) 2022-12-28
EP4106925B1 EP4106925B1 (fr) 2023-11-15

Family

ID=69699795

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20158007.3A Withdrawn EP3868476A1 (fr) 2020-02-18 2020-02-18 Mécanisme de broyage, procédé de fonctionnement
EP21704178.9A Active EP4106925B1 (fr) 2020-02-18 2021-01-19 Mécanisme de broyage, procédé de fonctionnement

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20158007.3A Withdrawn EP3868476A1 (fr) 2020-02-18 2020-02-18 Mécanisme de broyage, procédé de fonctionnement

Country Status (5)

Country Link
US (1) US11691154B2 (fr)
EP (2) EP3868476A1 (fr)
CN (1) CN115135419A (fr)
FI (1) FI4106925T3 (fr)
WO (1) WO2021164970A1 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232773B (en) * 1987-12-16 1991-10-09 Secr Defence Electronic tilt measuring system
US7226010B2 (en) * 2004-02-27 2007-06-05 Abb Inc. Method and apparatus for solid fuel pulverizing operation and maintenance optimization
US7182283B1 (en) * 2004-12-17 2007-02-27 Engineering Consultants Group, Inc. Pulverizer real-time monitoring system
JP4789019B2 (ja) * 2007-12-07 2011-10-05 新東工業株式会社 鋳物砂再生装置
TW201043336A (en) * 2009-04-01 2010-12-16 Smidth As F L Method for controlling the material feed to a roller mill and such mill
CN102782348A (zh) * 2010-03-01 2012-11-14 西门子公司 具有传感器装置的轴承模块
US8608097B2 (en) * 2010-11-08 2013-12-17 Alstom Technology Ltd System and method for monitoring operational characteristics of pulverizers
DK3056278T3 (da) 2015-02-10 2019-08-26 Flender Gmbh Gearanordning til en vertikalmølle
DK3414013T3 (da) * 2016-02-08 2019-08-05 Loesche Gmbh Malevalse-indretning
DE102016119377B4 (de) * 2016-10-12 2020-08-20 Gebr. Pfeiffer Se Lagerelement geeignet für die Lagerung eines Mahltellers in einer Wälzmühle
EP3505258B1 (fr) * 2018-01-02 2020-09-02 Sigma Laborzentrifugen GmbH Centrifugeuse de laboratoire

Also Published As

Publication number Publication date
EP3868476A1 (fr) 2021-08-25
WO2021164970A1 (fr) 2021-08-26
FI4106925T3 (fi) 2024-02-13
CN115135419A (zh) 2022-09-30
EP4106925B1 (fr) 2023-11-15
US11691154B2 (en) 2023-07-04
US20230057328A1 (en) 2023-02-23

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