EP3981513B1 - Immersion vorrichtung zum vermahlen - Google Patents

Immersion vorrichtung zum vermahlen Download PDF

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Publication number
EP3981513B1
EP3981513B1 EP21201575.4A EP21201575A EP3981513B1 EP 3981513 B1 EP3981513 B1 EP 3981513B1 EP 21201575 A EP21201575 A EP 21201575A EP 3981513 B1 EP3981513 B1 EP 3981513B1
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EP
European Patent Office
Prior art keywords
temperature
basket
rotor
grinding
max
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.)
Active
Application number
EP21201575.4A
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English (en)
French (fr)
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EP3981513A1 (de
Inventor
Giuseppe ROMANO
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.)
COMEC Srl
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COMEC Srl
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Publication of EP3981513A1 publication Critical patent/EP3981513A1/de
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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
    • B02C17/02—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 with perforated container
    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/168—Mills in which a fixed container houses stirring means tumbling the charge with a basket media milling device arranged in or on the container, involving therein a circulatory flow of the material to be milled
    • 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
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • 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
    • B02C17/20—Disintegrating members
    • B02C17/205—Adding disintegrating members to the tumbling mill
    • 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
    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C2017/165—Mills in which a fixed container houses stirring means tumbling the charge with stirring means comprising more than one agitator

Definitions

  • the present invention relates to an immersion grinding apparatus, which is adapted to perform grinding of powder or granular materials in order to reduce the granulometry of the product and which may be used for the preparation of paints, inks, colouring agents, cosmetic products, etc.
  • the invention relates to an immersion grinding apparatus comprising a basket mill, adapted to be immersed into a liquid mixture contained in a process container.
  • the product is placed into a process container having an open upper edge, and a basket mill is immersed into the product contained in the process container.
  • the basket mill includes a basket having an external perforated wall and containing a mass of balls which are set into motion by a pin rotor, which is rotatably actuated by an electric motor.
  • the mass of moving balls within the basket crushes the powder or granular material.
  • the liquid product containing the granular material to be ground enters the basket through an upper opening and is expelled from the basket thanks to the centrifugal action of the balls, which keep on moving thanks to the pin rotor.
  • One or more stirrers are normally arranged outside the basket mill, in order to agitate the liquid within the grinding container and in order to favour the passage of the liquid within the basket mill.
  • such grinding apparatuses In such grinding apparatuses, a part of the energy employed to grind and agitate the product is converted into thermal energy, which increases the product temperature.
  • a cooling system which includes a cooling chamber arranged in the upper part of the basket mill and a cooling interspace arranged in the side wall of the process container.
  • a cooling liquid (usually water) is circulated in the cooling chambers, in order to remove the heat produced by the grinding assembly.
  • the known apparatuses include a temperature sensor, which arrests operation of the grinding apparatus when the detected temperature exceeds a set threshold value.
  • a temperature sensor which arrests operation of the grinding apparatus when the detected temperature exceeds a set threshold value.
  • the apparatus is stopped because the product temperature exceeds the maximum process temperature, it is necessary to wait for the machine to cool down, before restarting the grinding process. This may require very long times, because the mass of the product contained in the process container exhibits a high thermal inertia. Interrupting the process because the maximum process temperature has been exceeded may also bring about problems concerning the grinding quality, e.g. because some components of the mixture may deposit on the container bottom during the interruption.
  • An immersion grinding apparatus according the preamble of claim 1 is disclosed in document US6029915A .
  • the present invention aims at providing a grinding apparatus which overcomes the problems of the prior art.
  • said object is achieved by a grinding apparatus having the features set forth in Claim 1.
  • the grinding apparatus enables setting the rotational speed of the basket mill rotor and of the stirrer to different values, which are lower than the nominal speed values, when the product temperature detected by a temperature sensor exceeds various temperature thresholds which are lower than the maximum process temperature.
  • This control system helps stabilizing the product temperature during the grinding process to various equilibrium points, which are lower than the maximum process temperature of the product being mixed. Therefore, the risk of interrupting the grinding process due to a product overheating is substantially reduced.
  • the apparatus according to the present invention enables reducing the process times in comparison with the known solutions, and leads to an improvement of the product quality in terms of granulometry.
  • reference number 10 denotes an immersion grinding apparatus according to the present invention.
  • Apparatus 10 includes a base 12 resting on the ground, wherefrom a telescopic vertical column 14 extends.
  • An upper support structure 16 is connected to the upper end of column 14.
  • the telescopic column 14 is controlled by a hydraulic unit 18, associated to an electric motor 20.
  • the telescopic column 14 controls the movement of the upper support structure 16 between a lowered operating position and a raised inoperative position.
  • the grinding apparatus 10 includes a basket mill 22, adapted to be immersed into a liquid contained in a process container 24 ( Figure 2 ).
  • the basket mill 22 is connected to the upper support structure 16 by a plurality of vertical supports 26.
  • Apparatus 10 includes a closure plate 28, arranged between the upper support structure 16 and the basket mill 22, and adapted to be applied onto an open upper edge 30 of process container 24 ( Figure 2 ).
  • the basket mill 22 includes an upper cap 32, which is connected to the lower ends of vertical supports 26.
  • Cap 32 may be hollow and may host a cooling chamber 34 wherein, in operation, a cooling liquid circulates.
  • the basket mill 22 includes a basket 36 which is fixed to the top cap 32 and extends downwards from top cap 32.
  • the basket 36 has a closed bottom wall and a perforated side wall 40.
  • Basket 36 contains a mass of balls 42, having a diameter larger than the diameter of the perforations of side wall 40.
  • basket mill 22 moreover comprises a rotor 44 extending inside basket 36 and being at least partially immersed in the mass of balls 42.
  • the rotor 44 may be a pin rotor, and it is fixed to the lower end of a drive shaft 46 extending through an opening 48 of top cap 32.
  • the drive shaft 46 is rotatable around its own longitudinal vertical axis, and it is rotatably driven by a first electric motor 48 carried by the upper support structure 16.
  • the grinding apparatus 10 comprises at least one rotating stirrer 50, located outside basket 36.
  • apparatus 10 includes two rotating stirrers 50, carried by respective vertical rotating shafts 52 which extend downwards from the upper support structure 16.
  • the shafts 52 of the rotating stirrers 50 are rotatably driven by a second electric motor 54, which is carried by the upper support structure 16.
  • Basket mill 32 includes a temperature sensor 56 ( Figure 1 ) carried by one of the vertical supports 26, and arranged in such a way as to be immersed in the liquid during operation.
  • FIG. 3 schematically shows the temperature control circuit of the grinding apparatus 10.
  • the temperature control circuit includes an electric panel 58, which comprises a control unit 60 (PLC) and two inverters 62, 64 which respectively drive the electric motor 48, driving the rotor of basket mill 22, and the electric motor 54, driving the rotating stirrers 50.
  • a user interface 66 enables setting the characteristic parameters of the grinding process.
  • the telescopic column 14 is extended, in such a way as to move the basket mill 22 above container 24.
  • the process container 24 may be provided, on the side wall thereof, with a cooling chamber 68 which, when process container 24 is located in the workstation, is connected to a liquid feeding apparatus via a connector 70.
  • the upper support structure 16 of apparatus 10 is lowered, so that the basket mill 22 is immersed into the fluid product contained in the process container 24.
  • the closure plate 28 is positioned on the upper edge 30 of container 24, in order to close the process volume.
  • the rotor 44 of basket mill 22 and the stirrers 50 are rotatably driven by the respective motors 48, 54.
  • the rotor 44 sets the mass of balls 42 into motion inside basket 40.
  • the moving balls 42 perform a grinding and crushing action on the powder or granular material, and mix the solid material with the liquid base.
  • the liquid product contained in basket 36 is expelled through the external perforated wall 40 of basket 36 thanks to the centrifugal action of balls 42.
  • Within basket 36 a vacuum is generated which sucks the liquid product back into basket 36 through the opening 47 surrounding the drive shaft 46 of rotor 44.
  • the stirrers 50 produce a whirling movement of the product within grinding container 24, which favours the product turnover within basket 36.
  • the cooling chamber 34 located within the cap 32 of basket mill 22 is connected to a cooling liquid feeding circuit via hydraulic connectors ( Figure 2 ) arranged on supports 26.
  • the energy needed to grind and agitate the product is partially converted into thermal energy, with a consequent increase of the product temperature.
  • a part of the thermal energy fed into the product during the process is removed by the cooling circuits.
  • the cooling system associated to the immersion mill 22 and to the grinding container 24 is generally incapable of removing all the thermal energy fed into the product during grinding. Therefore, the product temperature progressively increases during the process.
  • the temperature control system controls the rotational speed of the rotor 44 of basket mill 22 and of the stirrers 50 as a function of the temperature detected by sensor 56.
  • the temperature control system controls the following parameters:
  • Tc ′ Ts ⁇ Rc 2
  • Tc " Ts + Rc 2
  • control unit 60 For the operation of the temperature control system it is necessary to input into control unit 60, via user interface 66, the following operating parameters:
  • the product temperature increases progressively, as a function of time t, as shown in the diagram of Figure 4 .
  • This speed reduction helps stabilize the temperature, as shown in the diagram of Figure 4 .
  • the new temperature equilibrium point is shown in the diagram of Figure 5 .
  • the product temperature tends to get stabilized, as shown in Figure 6 .
  • control unit 60 reduces the rotational speed of rotor 44 and of stirrers 50 to zero, as shown in Figure 7 .
  • control system helps preventing the process temperature from exceeding the maximum temperature by progressively reducing temperature to successively decreasing values.
  • the temperature gradient is directly connected to the percentage of speed reduction.
  • the control system according to the present invention greatly reduces the need to stop the grinding process and to wait for the temperature to fall below the maximum process temperature.
  • the grinding apparatus according to the present invention enables achieving shorter process times and a better grinding quality, because it helps avoiding interruptions in the grinding process.

Landscapes

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

Claims (3)

  1. Immersionsmahlvorrichtung, umfassend:
    - eine obere Tragstruktur (16), die vertikal zwischen einer abgesenkten Arbeitsstellung und einer angehobenen Ruhestellung beweglich ist,
    - eine Korbmühle (22), die über vertikale Träger (26) mit der oberen Tragstruktur (16) verbunden ist und Folgendes umfasst: eine obere Kappe (32), die mit der oberen Tragstruktur (16) mittels der vertikalen Träger (26) verbunden ist, einen Korb (36), der an der oberen Kappe (32) angebracht ist und sich von der oberen Kappe (32) aus abwärts erstreckt, eine Masse von Kugeln (42), die in dem Korb (36) enthalten ist, einen Rotor (44), der sich innerhalb des Korbes (36) befindet und mit dem unteren Ende einer vertikalen Antriebswelle (46) verbunden ist, die sich durch eine Öffnung (47) der oberen Kappe (32) erstreckt,
    - mindestens einen rotierenden Rührer (50), der sich außerhalb des Korbes (36) befindet,
    - einen ersten Elektromotor (48), der den Rotor (44) der Korbmühle (22) in Drehung versetzt,
    - einen zweiten Elektromotor (54), der den mindestens einen Rührer (50) in Drehung versetzt,
    - einem Temperatursensor (56), der so eingerichtet ist, dass er die Temperatur des Produkts während des Mahlens erfasst,
    dadurch gekennzeichnet, dass sie umfasst:
    - eine Steuereinheit (60), die den ersten und den zweiten Elektromotor (48, 54) in Abhängigkeit von vom Temperatursensor (56) gelieferten Signalen steuert und den Betrieb der Vorrichtung unterbricht, wenn die vom Temperatursensor (56) erfasste Temperatur eine maximale Prozesstemperatur (Tmax) überschreitet,
    wobei die Steuereinheit (60) so konfiguriert ist, dass sie die Drehzahlen des Rotors (44) und des mindestens einen Rührers (50) auf verschiedene Werte (nR', nA', nR", nA", nR‴, nA‴) einstellt, die niedriger sind als Nenndrehzahlwerte (nR, nA), wenn die vom Temperatursensor (56) erfassten Temperaturen verschiedene Temperaturschwellen (Tc', Ts, Tc") überschreiten, die niedriger sind als die maximale Prozesstemperatur (Tmax).
  2. Vorrichtung nach Anspruch 1, wobei die Steuereinheit (60) so konfiguriert ist, dass sie eine Schwellentemperatur (Ts), eine untere Steuertemperatur (Tc'), die niedriger als die Schwellentemperatur (Ts) ist, und eine obere Steuertemperatur (Tc") speichert, die höher als die Schwellentemperatur und niedriger als die maximale Prozesstemperatur (Tmax) ist, und so konfiguriert ist, dass sie eine erste reduzierte Drehzahl (nR', nA') des Rotors und des mindestens einen Rührers einstellt, wenn die vom Temperatursensor (56) erfasste Temperatur zwischen der unteren Steuertemperatur (Tc') und der Schwellentemperatur (Ts) liegt, eine zweite reduzierte Drehzahl (nR", nA"), wenn die vom Temperatursensor (56) erfasste Temperatur zwischen der Schwellentemperatur (Ts) und der oberen Steuertemperatur (Tc") liegt, und eine dritte reduzierte Drehzahl (nR‴, nA‴), wenn die vom Temperatursensor (56) erfasste Temperatur zwischen der oberen Steuertemperatur (Tc") und der maximalen Prozesstemperatur (Tmax) liegt.
  3. Vorrichtung nach Anspruch 2, wobei die Steuereinheit (60) so konfiguriert ist, dass sie jede der reduzierten Drehzahlen als arithmetisches Mittel zwischen den vorherigen Drehzahlen und den um einen Reduktionskoeffizienten (CR, CA) reduzierten vorherigen Drehzahlen berechnet.
EP21201575.4A 2020-10-12 2021-10-08 Immersion vorrichtung zum vermahlen Active EP3981513B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202000023938 2020-10-12

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EP3981513A1 EP3981513A1 (de) 2022-04-13
EP3981513B1 true EP3981513B1 (de) 2023-07-05

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ES (1) ES2955548T3 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT367657B (de) * 1978-08-24 1982-07-26 Buehler Ag Geb Ruehrwerkskugelmuehle-regelung
JP4013211B2 (ja) * 1998-03-03 2007-11-28 株式会社井上製作所 媒体分散装置
EP3618965A1 (de) * 2017-05-05 2020-03-11 Belmonte Investments Limited Attritormühle und vorgang zur verwendung davon

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EP3981513A1 (de) 2022-04-13
ES2955548T3 (es) 2023-12-04

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