EP3144070A1 - Procede de fonctionnement d'un broyeur tubulaire, agencement destine a determiner des donnees caracteristiques d'un broyeur tubulaire et broyeur tubulaire - Google Patents

Procede de fonctionnement d'un broyeur tubulaire, agencement destine a determiner des donnees caracteristiques d'un broyeur tubulaire et broyeur tubulaire Download PDF

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Publication number
EP3144070A1
EP3144070A1 EP15185831.3A EP15185831A EP3144070A1 EP 3144070 A1 EP3144070 A1 EP 3144070A1 EP 15185831 A EP15185831 A EP 15185831A EP 3144070 A1 EP3144070 A1 EP 3144070A1
Authority
EP
European Patent Office
Prior art keywords
grinding drum
charge
vibration
tube mill
arrangement
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.)
Withdrawn
Application number
EP15185831.3A
Other languages
German (de)
English (en)
Inventor
Markus ERDMANNSDÖRFER
Stefan Smits
Kurt Tischler
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to EP15185831.3A priority Critical patent/EP3144070A1/fr
Priority to PCT/EP2016/070443 priority patent/WO2017045918A1/fr
Publication of EP3144070A1 publication Critical patent/EP3144070A1/fr
Withdrawn legal-status Critical Current

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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
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/1805—Monitoring devices for tumbling mills

Definitions

  • the invention relates to a method for operating a tube mill, an arrangement for determining characteristic data of a tube mill and a tube mill with such an arrangement.
  • the mill consists of a large hollow steel cylinder, further referred to as a grinding drum, with up to 12 m in diameter, in which more than 1000 tons of material are moved.
  • grinding media are additionally introduced into the millbase, in particular in the manner of steel balls. Since the grinding drum rotates about an axis which is substantially horizontal, the charge comprising the ground material (ore) and the grinding media (steel balls) is raised in the grinding drum and then falls back to the bottom remaining material at the bottom of the grinding drum. In this context, especially gravitational forces are exploited. The impact of the ore as well as the abrasion within the circulating filling causes the ore to break.
  • Important parameters for the optimization of the grinding process include the degree of filling, the composition of the charge and the distribution of the charge in the mill. These parameters can vary widely as the composition and density of the ore change during operation and, in addition, the steel balls added to aid the milling process wear out. In addition, deviations between feeding the mill and the continuous discharge may lead to a change in the filling volume.
  • composition of the charge in the mill can not be measured directly because any corresponding sensor in the grinding drum would be destroyed by the large moving masses.
  • the acoustic detection has been further developed according to US 2004 255 680 (A1 ).
  • a wireless microphone is mounted on the mill shell or mill outer wall to locally measure break / impact noise inside the mill, which is generated near the position of the microphone. Since the microphone rotates together with the mill, this "sees" all positions in a mill cross-section. From the difference between the sound amplitudes, the geometric position of the filling can be derived.
  • an arrangement for recording characteristic data of a ring motor-driven mill which comprises a rotating mill shell with rotor coils and a stator with stator coils, vibrations of the mill shell are transmitted via the rotor coils on the stator coils and / or positioned on the stator measuring coils.
  • an induction voltage induced on at least one stator coil and / or on at least one measuring coil is determined by tapping on the power supply of a stator coil and / or by tapping on at least one measuring coil, and at least one state variable of a milling method is derived which determines the state of filling of the mill in the sector of the associated stator coil.
  • the invention has for its object to provide a reliable, alternative determination of a distribution of the charge of a tube mill.
  • the object is achieved by a method for operating a tube mill, which has a stator and a rotating grinding drum for receiving a charge, wherein by means of at least one attached to the circumference of the grinding drum vibration sensor measurement data are determined, which characterize at least one vibration magnitude, the Measurement data are transmitted to a stationary receiver and is determined on the basis of the calculated vibration quantity taking into account a position of the rotating vibration sensor during rotation of the grinding drum, a distribution of charge in the grinding drum.
  • an arrangement for determining characteristic data of a tube mill which has a stator and a rotating grinding drum for receiving a charge, comprising at least one mounted on the circumference of the grinding drum vibration sensor, a stationary receiver and an evaluation, which set up for it is to determine a distribution of the charge in the grinding drum from the measurement data characterizing at least one oscillation variable, taking into account a position of the rotating oscillation sensor during the rotation of the grinding drum.
  • the object is finally achieved according to the invention by a tube mill with such an arrangement.
  • the invention is based on the idea of attaching one or more vibration sensors to the circumference of the grinding drum, the measured data of which are fed to a data acquisition device and of an evaluation unit are analyzed so that due to the obtained vibration characteristic of the charge in the grinding drum, the distribution of the ground material or the grinding media, which are contained in the charge, is determined and monitored in the grinding drum.
  • the at least one vibration sensor is firmly attached to the grinding drum and rotates with this. In the case of several vibration sensors around the circumference of the vibration drum, they can have the same distance from each other or can be placed at different distances from each other.
  • the vibration characteristic of the charge is defined by at least one vibration quantity.
  • a vibration variable in particular a vibration acceleration is used.
  • the vibration acceleration (m / s 2 ) is usually used as a parameter for mechanical vibrations.
  • the vibration velocity (mm / s) or the vibration displacement ( ⁇ m, mm) are suitable as vibration quantities.
  • the vibration velocity can be formed by simple integration of the vibration acceleration, the vibration path by double integration. Taking into account the position in which the respective vibration sensor has taken the measurement data, a relationship between the amount of the applied force on the wall of the grinding drum and the location of the applied force during the grinding process can be established. In this way, a quantitative statement can be made about the distribution of the mill contents and the point of impact.
  • the method described above is suitable for monitoring the distribution of the ground material and the grinding media in all three states.
  • the measurement data is transmitted wirelessly to the receiver. Thanks to the wireless data transmission from the respective vibration sensor to the stationary receiver, an arrangement of the vibration sensors is made possible directly on the grinding drum. For this, e.g. a Wi-Fi connection can be used.
  • WLAN wireless technology is so well developed today for use in industry that data can be transferred reliably and machines can be operated without contact. In this case, a suitable range and achievable data rate is set.
  • the receiver is arranged on the stator and the measured data are transmitted to the receiver arranged on the stator.
  • This arrangement is particularly favored by the wireless data transmission and has the advantage that the measurement data are evaluated stationary.
  • an RMS value of the vibration acceleration and / or the vibration velocity and / or the vibration travel over a rotation angle of the grinding drum is considered.
  • Such a representation of the o.g. Sizes allows the determination of the force, which depends on the fall height of the material.
  • a deflection angle of the charge is additionally determined from the measured data.
  • the deflection angle defines the center of gravity of the charge from the grinding stock and grinding media, so the deflection angle is an important factor for optimizing the milling process.
  • the positions of the measuring points on the grinding drum are known.
  • the absolute position of the grinding drum is also known due to the available actual rotational angle value (derived from a tachometer or calculated).
  • the determined vibration magnitude can always be assigned to the absolute position relative to the stator. The deflection then results from the center position between the inlet and outlet of the measuring probe or the vibration sensor of the material (ore) covered area.
  • At least one operating parameter of the tube mill is regulated as a function of the determined distribution of the charge in the grinding drum.
  • the speed of rotation, the speed of rotation or a state variable of the filling such as e.g. Feeding of regrind, addition of water, etc. in question.
  • a desired operating point of the tube mill can be set automatically as a manipulated variable via the rotational speed.
  • FIG. 1 a tube mill 1 is shown with a ring motor drive 3, however, the invention is also applicable to other mill types. Is driven according to FIG. 1 a hollow cylinder with the name milling drum 7. Inside there is a charge 9 (see FIG. 2 ), which is constantly circulated during the rotation of the grinding drum 7. A stator 5 of the ring motor 3 is preferred and there are stator coils 11, 12 indicated.
  • FIG. 2 symbolically the grinding drum 7 is shown with the charge 9.
  • the charge 9 comprises a ground material 13, in this case ore, as well as grinding bodies 15, which are designed as steel balls 15 in the exemplary embodiment shown.
  • Ground material 13 introduced into the grinding drum 7 is comminuted during operation of the tube mill 1 inside the grinding drum 7 by means of the steel balls 15.
  • the ground material 13 is shown rectangular and the grinding media 15 circular.
  • a direction of rotation of the grinding drum 7 is indicated by the arrow R.
  • an arrangement 16 which comprises a vibration sensor 17.
  • the vibration sensor 17 is attached to an outer wall of the grinding drum 7 and wirelessly transmits measurement data M via a WLAN connection to a receiver 19 attached to the stator 5, which is not shown here.
  • other methods of data transmission are applicable, not only for wireless transmission. but also, for example, wired (via slip ring) or by modulating on the excitation power supply.
  • the receiver 17 then feeds the measurement data M into an evaluation unit 21, which is likewise part of the arrangement 16.
  • vibration sensor 17 In the embodiment shown, only one vibration sensor 17 is shown. However, two or more vibration sensors 17 can also be used.
  • At least one oscillation variable in particular an oscillation acceleration a, is determined.
  • the vibration acceleration a is measured over the entire circumference of the flour drum 7.
  • Three such measuring points are in FIG. 2 marked with the numbers I, II and III.
  • a root mean square (RMS) of the acceleration a is plotted against the grinding drum 7 over a rotation angle ⁇ . This is in FIG. 3 shown.
  • the vibration sensor 17 enters the area of the material.
  • the vibration acceleration a begins to increase.
  • the vibration sensor 17 is already in the area in which the ore 13 and the steel balls 15 strike against the inner drum wall. This is graphically represented by a steep peak of the vibration acceleration a.
  • the vibration acceleration a drops steadily until at measuring point III, at which the vibration acceleration a leaves the area of the material.
  • a peak occurs again in the graph, as long as a cataract movement is set.
  • ⁇ 1 is a measure of the force which depends on the drop height and the amount of material in the milling drum 7 and ⁇ 2 is a measure of the angle at which the measuring point is in relation to the material.
  • measuring points I and II of the signal curve it is also possible to determine the impact point of the ground material 13 or of the grinding elements 15 on the wall of the grinding drum 7. If measuring point II is in front of measuring point I, the drum wall becomes hit directly by the steel balls 15, whereby the wear of the mill increases extremely. If measuring point II is located just behind the measuring point I, mill 1 will have an optimal grinding process. And if measuring point II is far behind the measuring point I, the steel balls 15 fall in the middle of the ground material 13, whereby the effectiveness of the milling process decreases.
  • a control signal for controlling the tube mill 1 is FIG. 2 symbolically represented by the arrow S.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP15185831.3A 2015-09-18 2015-09-18 Procede de fonctionnement d'un broyeur tubulaire, agencement destine a determiner des donnees caracteristiques d'un broyeur tubulaire et broyeur tubulaire Withdrawn EP3144070A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15185831.3A EP3144070A1 (fr) 2015-09-18 2015-09-18 Procede de fonctionnement d'un broyeur tubulaire, agencement destine a determiner des donnees caracteristiques d'un broyeur tubulaire et broyeur tubulaire
PCT/EP2016/070443 WO2017045918A1 (fr) 2015-09-18 2016-08-31 Procédé de fonctionnement d'un broyeur tubulaire, ensemble permettant de déterminer des données caractéristiques d'un broyeur tubulaire et broyeur tubulaire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15185831.3A EP3144070A1 (fr) 2015-09-18 2015-09-18 Procede de fonctionnement d'un broyeur tubulaire, agencement destine a determiner des donnees caracteristiques d'un broyeur tubulaire et broyeur tubulaire

Publications (1)

Publication Number Publication Date
EP3144070A1 true EP3144070A1 (fr) 2017-03-22

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EP15185831.3A Withdrawn EP3144070A1 (fr) 2015-09-18 2015-09-18 Procede de fonctionnement d'un broyeur tubulaire, agencement destine a determiner des donnees caracteristiques d'un broyeur tubulaire et broyeur tubulaire

Country Status (2)

Country Link
EP (1) EP3144070A1 (fr)
WO (1) WO2017045918A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109225490A (zh) * 2018-08-31 2019-01-18 中材（天津）控制工程有限公司 基于静电法的管磨机料位检测系统及其使用方法
SE2100048A1 (en) * 2020-04-09 2021-10-10 Spm Instr Ab A Mill Process System

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2235928A (en) 1939-01-04 1941-03-25 Hardinge Co Inc Apparatus for and method for controlling grinding devices
DE1202107B (de) * 1964-06-24 1965-09-30 Polysius Gmbh Verfahren und Vorrichtung zur Bestimmung des Fuellungsgrades einer Kugelmuehle
DE19933995A1 (de) * 1999-07-20 2001-03-01 Kima Ges Fuer Echtzeitsysteme Füllstandsmessung für Kugelmühlen
US20040255680A1 (en) 2003-01-31 2004-12-23 Ortega Luis Alberto Magne System to determine and analyze the dynamic internal load in revolving mills, for mineral grinding
US6874364B1 (en) * 1999-07-09 2005-04-05 Commonwealth Scientific And Industrial Research Organisation System for monitoring mechanical waves from a moving machine
DE102010064263A1 (de) 2010-07-29 2012-02-02 Siemens Aktiengesellschaft Anordnung, Betriebsverfahren und Schaltung für eine Ringmotor-getriebene Mühle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2235928A (en) 1939-01-04 1941-03-25 Hardinge Co Inc Apparatus for and method for controlling grinding devices
DE1202107B (de) * 1964-06-24 1965-09-30 Polysius Gmbh Verfahren und Vorrichtung zur Bestimmung des Fuellungsgrades einer Kugelmuehle
US6874364B1 (en) * 1999-07-09 2005-04-05 Commonwealth Scientific And Industrial Research Organisation System for monitoring mechanical waves from a moving machine
DE19933995A1 (de) * 1999-07-20 2001-03-01 Kima Ges Fuer Echtzeitsysteme Füllstandsmessung für Kugelmühlen
US20040255680A1 (en) 2003-01-31 2004-12-23 Ortega Luis Alberto Magne System to determine and analyze the dynamic internal load in revolving mills, for mineral grinding
DE102010064263A1 (de) 2010-07-29 2012-02-02 Siemens Aktiengesellschaft Anordnung, Betriebsverfahren und Schaltung für eine Ringmotor-getriebene Mühle

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109225490A (zh) * 2018-08-31 2019-01-18 中材（天津）控制工程有限公司 基于静电法的管磨机料位检测系统及其使用方法
CN109225490B (zh) * 2018-08-31 2024-01-30 中材（天津）控制工程有限公司 基于静电法的管磨机料位检测系统及其使用方法
SE2100048A1 (en) * 2020-04-09 2021-10-10 Spm Instr Ab A Mill Process System
WO2021251858A1 (fr) * 2020-04-09 2021-12-16 S.P.M. Instrument Ab Procédé et système de génération d'informations relatives à un état interne d'un broyeur culbuteur
CN115697563A (zh) * 2020-04-09 2023-02-03 S.P.M.仪器公司 用于生成与滚磨机的内部状态相关的信息的方法和系统
EP4132715A4 (fr) * 2020-04-09 2024-04-10 S.P.M. Instrument AB Procédé et système de génération d'informations relatives à un état interne d'un broyeur culbuteur
SE546087C2 (en) * 2020-04-09 2024-05-21 Spm Instr Ab System and method for generating information relating to the internal state of a tumbling mill

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Publication number Publication date
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