EP3159061A1 - Broyeur a boulets annulaire dote d'une surveillance amelioree - Google Patents

Broyeur a boulets annulaire dote d'une surveillance amelioree Download PDF

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Publication number
EP3159061A1
EP3159061A1 EP15191255.7A EP15191255A EP3159061A1 EP 3159061 A1 EP3159061 A1 EP 3159061A1 EP 15191255 A EP15191255 A EP 15191255A EP 3159061 A1 EP3159061 A1 EP 3159061A1
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EP
European Patent Office
Prior art keywords
grinding
ring
ball
pressure
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
EP15191255.7A
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German (de)
English (en)
Other versions
EP3159061B1 (fr
Inventor
Volker GÖCKE
Jens-Peter Dr. Thiel
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.)
Claudius Peters Projects GmbH
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Claudius Peters Projects GmbH
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Publication date
Application filed by Claudius Peters Projects GmbH filed Critical Claudius Peters Projects GmbH
Priority to EP15191255.7A priority Critical patent/EP3159061B1/fr
Publication of EP3159061A1 publication Critical patent/EP3159061A1/fr
Application granted granted Critical
Publication of EP3159061B1 publication Critical patent/EP3159061B1/fr
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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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/12—Mills with at least two discs or rings and interposed balls or rollers mounted like ball or roller bearings
    • B02C15/123—Mills with at least two discs or rings and interposed balls or rollers mounted like ball or roller bearings with rings and interposed 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
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating

Definitions

  • the invention relates to a ball mill with improved monitoring of Mahlkugelterrorism, and a corresponding method.
  • Ball mill mills have a grinder, which consists of a plurality of grinding balls, which are guided between a Mahlring and a pressure ring in a Mahlspur.
  • the grinding balls are set in motion by a difference in the rotational speeds of grinding and pressure ring.
  • the pressure ring which is generally arranged at the top, serves to guide the grinding balls and transmits the grinding pressure built up by means of a hydraulic tensioning device or spring assemblies to the grinding balls.
  • Ball ring mills are mainly used in the grinding of coarse-grained grinding material such as minerals, coal or gypsum. In particular, when used in large process plants considerable amounts of regrind can be enforced.
  • the invention has for its object to provide an improved ball mill, which is more robust and less prone to blockages.
  • a slip control system for the grinding balls is provided according to the invention, at the input of a arranged outside the grinding chamber sensor is connected to detect the ball and at the output at least one dynamically adjustable actuator is connected, which acts on the pressure ring and presses it against the guided on the Mahlring balls.
  • the invention thus achieves that when the slip is detected, the pressure acting on the pressure balls via the pressure ring increases or decreases, so as to reduce or increase the slippage of the grinding ball.
  • the slip deviation can be compensated.
  • the ball ring mill is thus more robust with regard to its operating behavior. Fluctuations, in particular varying properties of the raw material supplied, can be better compensated. Overall, a more sensitive control of the ball ring mill is achieved, which not only improves the reliability, but also increases the quality of the issued ground material.
  • the rotational speed of the drive is constant in the case of ball-type mills that are practically executed. Therefore, a measurement of the drive speeds is often unnecessary.
  • the actual drive speed is detected and fed to the slip control system as a further input signal. This offers the advantage that valid values for the slip control system are always available even in dynamically changeable situations (in particular when starting up the ball ring mill). Particularly useful here is when as a signal for the speed the speed difference between Mahlring and pressure ring is used.
  • the slip control system is preferably designed so that at a low ball circulation speed by lowering the pressure exerted by the pressure plate, the speed is increased and thus the slip is reduced.
  • the sensor for detecting the ball circulation is preferably designed as an acoustic sensor which measures the sound generated by the movement of the grinding balls in the grinding mechanism.
  • this sound measured by the acoustic sensor is evaluated by means of a frequency detector.
  • the frequency detector is designed for performing a real-time Fourier analysis.
  • the frequency spectrum obtained by the Fourier analysis reproduces the real ball circulation frequency of the grinding balls. This is a non-invasive and easy to order and wear-free way a measure of the real ball screw frequency available.
  • the Fourier transform can be done in real time, so that even with dynamic changes in the speed of the grinding ball quickly a corresponding measurement signal is available, without having to wait for complete rounds.
  • the invention thus provides an improved measuring signal for the recirculating ball frequency on the one hand robust but on the other hand also in a very dynamic manner.
  • the Fourier analysis is preferably carried out as a discrete Fourier analysis. This offers the advantage of fast measured value processing, which in particular serves to achieve greater dynamics.
  • the Fourier analysis is performed as a Fast Fourier Analysis (FFT). This also improves the dynamics of measured value acquisition.
  • FFT Fast Fourier Analysis
  • the acoustic sensor may be implemented as a conventional microphone. However, it can also be provided that the acoustic sensor is designed as a structure-borne sound sensor. The latter has the advantage that the structure-borne noise generated by the movements of the grinding balls in the grinder is measured directly, so that an impairment of the measurement is reduced by ambient noise.
  • more than one structure-borne sound sensor is provided on the mill housing. This not only improves the acquisition of the measurement signal for structure-borne noise, since now two signals are available and thus increases the power of the desired signal so far.
  • the provision of a second structure-borne sound detector also has the advantage that it creates a reference, whereby interference from external components, which are expected to act on both structure-borne sound sensors, can be more easily detected and taken into account in the subsequent processing of the measurement signals. Since structure-borne sound sensors are extremely inexpensive available and the location of their attachment to the mill housing is not critical, a considerable improvement in the quality of measurement is achieved in this way with little additional effort.
  • a second correction circuit may be provided, which includes the slip meter and the drive.
  • This correction circuit is designed in such a way that if the slip is too great, a correction signal is output to the drive for changing the rotational speed of the drive.
  • This is expediently carried out in such a way that the rotational speed of the grinding ring is reduced in the event of too great a slip by lowering the drive speed.
  • the balls no longer need to rotate so fast around the mill axis, whereby the slip is reduced.
  • the ball mill according to the invention can be better adapted in changing operating conditions, in particular fluctuations in the amount of ground material supplied.
  • the invention further extends to a corresponding method for monitoring the ball circulation.
  • FIG Fig. 1 An embodiment of a ball mill according to the invention is shown schematically in FIG Fig. 1 shown.
  • the ball ring mill 1 comprises a mill housing 10 with a grinder 2, which is arranged in a grinding chamber 11.
  • the grinder 2 comprises a grinding ring 21, which is offset by a drive motor 23 in rotary motion.
  • five grinding balls 3 are provided, of which three in the illustration in accordance with Fig. 1 are visible.
  • a pressure ring 22 acts on the grinding balls 3, so that the grinding balls 3 are held between the pressure ring 22 and the grinding ring 21.
  • the pressure ring 22 presses the grinding balls 3 into the grinding track 27 at the top of the grinding ring 21.
  • the grinding ring 21 is rotated by the drive motor 23, and the grinding balls roll both on the grinding ring 21 and on the pressure ring 22 off. In the undisturbed state, they move approximately at half the differential rotational speed between pressure ring 22 and Mahlring 21. If, as in the illustrated embodiment, the pressure ring 22 stationary and only the Mahlring 21 driven, the Mahlkugeln 3 run at about half the rotational speed of the Mahlrings 22.
  • the drive motor 23 is actuated by a control unit 25.
  • the control unit 25 sets a number of revolutions n of Drive motor 23 and the grinding ring 21 a.
  • the number of revolutions n of the grinding ring 21 is constant, but it is also possible for deviations ⁇ n to be predetermined.
  • the pressure ring 21 is acted upon by the hydraulically operated pressure plate 24 with a force acting on Mahlring 21 force.
  • the pressure plates 24 are actuators of a pressure control loop implemented in the pressure controller 26.
  • an acoustic sound sensor 40 is provided. It is arranged outside at the height of the grinding balls 3 on the mill housing 10. However, the arrangement at this position is not mandatory, it may also be located at other locations, also outside the mill and be located, for example, at the position indicated by the reference numeral 40 'position.
  • the acoustic sensor 40 receives the circulating noise caused by the grinding balls 3 in the mill housing 10.
  • the signal measured by the acoustic sensor 40 is added to an evaluation unit 41.
  • a module for a fast Fourier transformation (FFT) is implemented. This is expediently realized in the form of a discrete FFT, which is particularly suitable for implementation in a computer-aided system.
  • a signal ⁇ for the recorded by the sound sensor 50 actual rotational frequency of the grinding balls 3 is output. This signal is applied to an input of a slip control system 5.
  • a signal for the rotational speed n of the grinding ring 21 is applied.
  • the number "5" stands for the number of grinding balls 3, which rotate on the grinding ring 21.
  • the thus obtained signal s for the slippage of the grinding balls 3 is output by the arithmetic unit 51 and applied to the input of a control unit 52.
  • the control unit 52 is designed to modify the pressure acting on the pressure plate 24 hydraulic pressure generated by a hydraulic unit 28 in response to the slip signal s.
  • a servo valve 54 is arranged between the hydraulic unit 28 and the pressure plate 24, which is controlled by a control signal at the output of the control unit 52.
  • the control unit 52 may be implemented as a P or PI controller. It is designed so that with increasing slip s the pressure acting on the pressure plate 24 hydraulic pressure is increased by means of the servo valve 54.
  • the pressure plate 24 exert a greater compressive force on the pressure ring 22, so that the grinding balls 3 are pressed firmly against the grinding ring 21.
  • a second correction circuit 6 may be provided, which includes its own speed correction unit 60. At an input of the speed correction unit 60 is also the signal s for the slip applied. It determines a need for a change in the rotational speed n with which the drive motor 23 drives the grinding ring 21. As a rule, this speed n should be kept constant and not be changed. However, in particular, if the slip deviates too much and the first correction circuit comprising the action on the pressure adjusting device 24 is no longer sufficient for correction, the correction member 60 can generate a speed correction signal ⁇ n which is applied to the drive control unit 25 as an additional input signal.
  • the drive control unit 25 with the drive 23 of the grinding ring 21 can make a contribution to the stabilization of the slip s and thus to safe mill operation.
  • a tolerance band member 62 is provided for the correction member 60 thereto. It is thereby achieved that, with slight slip, the first correction circuit alone operates via the pressure actuator 24, while in the case of greater slip, intervention is still effected by the second correction circuit 6 generating a speed change value ⁇ n for the speed control 25 of the drive motor 23.
  • the acoustic sensor 40 may, for example, also be embodied as a structure-borne sound sensor. This can be arranged arbitrarily on the mill housing. A possible location is 40 'in place Fig. 1 shown. This stands by way of example for any desired location, in particular outside the actual plane of the grinding balls 3. Furthermore, it can also be provided that two or more acoustic sensors are arranged. In such a case, for example, an acoustic sensor 40 in the plane of the grinding balls 3 and another outside Mahlkugele be arranged, as symbolized by the reference numeral 40 '.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
EP15191255.7A 2015-10-23 2015-10-23 Broyeur a boulets annulaire dote d'une surveillance amelioree Not-in-force EP3159061B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15191255.7A EP3159061B1 (fr) 2015-10-23 2015-10-23 Broyeur a boulets annulaire dote d'une surveillance amelioree

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15191255.7A EP3159061B1 (fr) 2015-10-23 2015-10-23 Broyeur a boulets annulaire dote d'une surveillance amelioree

Publications (2)

Publication Number Publication Date
EP3159061A1 true EP3159061A1 (fr) 2017-04-26
EP3159061B1 EP3159061B1 (fr) 2018-03-28

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EP15191255.7A Not-in-force EP3159061B1 (fr) 2015-10-23 2015-10-23 Broyeur a boulets annulaire dote d'une surveillance amelioree

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EP (1) EP3159061B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110813476B (zh) * 2019-11-25 2021-03-02 刘栋 一种骨科反向转动中药研磨机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001006207A1 (fr) * 1999-07-19 2001-01-25 Eskom Structure de controle pour piece d'usure
JP3439800B2 (ja) * 1993-09-14 2003-08-25 バブコック日立株式会社 ミルおよびその運用方法
EP2075072A1 (fr) * 2007-12-27 2009-07-01 Claudius Peters Technologies GmbH Dispositif et procédé destinés à la surveillance du mouvement d'une balle de broyage dans un broyeur à bague de roulement à billes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3439800B2 (ja) * 1993-09-14 2003-08-25 バブコック日立株式会社 ミルおよびその運用方法
WO2001006207A1 (fr) * 1999-07-19 2001-01-25 Eskom Structure de controle pour piece d'usure
EP2075072A1 (fr) * 2007-12-27 2009-07-01 Claudius Peters Technologies GmbH Dispositif et procédé destinés à la surveillance du mouvement d'une balle de broyage dans un broyeur à bague de roulement à billes

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