AU2015353141A1 - Method for regulating the delivery capacity of a rotor of a separating device of a stirred ball mill, and stirred ball mill for comminuting material to be ground - Google Patents
Method for regulating the delivery capacity of a rotor of a separating device of a stirred ball mill, and stirred ball mill for comminuting material to be ground Download PDFInfo
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- AU2015353141A1 AU2015353141A1 AU2015353141A AU2015353141A AU2015353141A1 AU 2015353141 A1 AU2015353141 A1 AU 2015353141A1 AU 2015353141 A AU2015353141 A AU 2015353141A AU 2015353141 A AU2015353141 A AU 2015353141A AU 2015353141 A1 AU2015353141 A1 AU 2015353141A1
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- agitator
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- 239000000463 material Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 151
- 238000005086 pumping Methods 0.000 claims abstract 2
- 239000012530 fluid Substances 0.000 claims description 11
- 238000005549 size reduction Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- B02C17/161—Arrangements for separating milling media and ground material
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
-
- 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
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention relates to a method for regulating the output of a rotor of a separating device of a stirred ball mill for comminuting material to be ground with the aid of grinding balls. The stirred ball mill has a preferably cylindrical, horizontally arranged grinding vessel, at least one stirring unit which is driven by means of a drive, a material inlet, and a fine material outlet. At least the fine material outlet is assigned a separating device with a rotor for retaining the grinding balls. The material to be ground is pumped by means of an external pump via the material inlet into the stirred ball mill. According to the invention, the internal volume of the grinding chamber near the separating device and/or the flow cross section near the separating device can be adjusted on the basis of the throughput of material to be ground through the stirred ball mill, that is to say, in particular, according to a pumping speed of the external pump. The invention further relates to a stirred ball mill.
Description
P-ph0365-DE / P1001 ODE 24.11.2014 -1 -
METHOD FOR REGULATING THE DELIVERY CAPACITY OF A ROTOR OF A SEPARATING DEVICE OF AN AGITATOR BALL MILL AND AN AGITATOR BALL MILL FOR THE SIZE-REDUCTION OF GRINDING STOCK
The present invention relates to a method for regulating the delivery capacity of a rotor of a separating device of an agitator ball mill and an agitator ball mill for the size-reduction of grinding stock according to the features of the preambles of claims 1 and 10.
Prior art
The present invention relates to an agitator ball mill with a separating or classifying device. Such agitator ball mills are known for example from the prior art and are used for the coarse, fine and extremely fine size-reduction or homogenisation of grinding stock. They comprise a grinding chamber, in which grinding stock is size-reduced by grinding bodies. The grinding chamber is usually constituted by a horizontally mounted approximately circular-cylindrical grinding container. The mills are usually filled through an opening in one of the end walls. The output is dependent on the design and takes place for example via slots in the grinding chamber wall at the end of the mill, wherein the grinding bodies are held back by a separating device. This separating device is also referred to as a classifying device. Classification is understood to mean the separation of a disperse solid mixture into fractions, preferably according to the criteria of particle size and particle density. In the present case, this relates to separation into grinding bodies and sufficiently finely ground product or grinding stock. Since the geometrical particle size is the separation criterion in this case, the classification takes place for example by means of sieving or sievelike separating devices. The result is at least two fractions, which differ from one another in that the minimum threshold of the one fraction is at the same time the maximum threshold of the other fraction.
Agitator ball mills comprise a vertically or horizontally disposed, usually approximately cylindrical grinding container, which is filled 70 - 90% with grinding bodies. The grinding chamber is usually mounted stationary, non-rotating in the case of agitator ball mills. An agitator with suitable agitator elements provides for the
P-ph0365-DE / P1001 ODE 24.11.2014 -2 - intensive motion of the grinding bodies together with the grinding stock. The grinding bodies are made for example of steel or wear-resistant ceramic materials. The grinding stock, for example a grinding stock suspension, is continuously pumped through the grinding chamber. The suspended solids are size-reduced or dispersed by impact or shearing forces between the grinding bodies. The separation of grinding stock and grinding bodies takes place by means of a suitable separating device at the exit from the mill.
The problem of the invention is to provide a method and an agitator ball mill, with which the wear on the separating device or classifying device due to contact with the grinding bodies can be reduced and/or which can be adjusted in the optimum manner for the given product and/or the given desired throughput quantity.
The above problem is solved by a method and an agitator ball mill which comprises the features in independent claims 1 and 10. Further advantageous embodiments are described in the sub-claims.
Description
The invention relates to a method for regulating and/or optimising the delivery capacity of a rotor of a separating device of an agitator ball well. Such an agitator ball mill serves for the size-reduction of grinding stock with the aid of grinding bodies in a preferably cylindrically constituted, horizontally arranged grinding container. At least one drive for driving an agitator inside the grinding container is assigned to the grinding container. The at least one drive shaft of the agitator is preferably mounted outside the grinding container and is sealed by means of a slip-ring seal in a side wall of the horizontal grinding container against the latter. In the case of agitator ball mills with two driven agitators, the two drive shafts of the two drives, preferably independent of one another, are mounted for example in the opposite end walls of the horizontal grinding container.
The agitator ball mill comprises a material inlet and a fine stock outlet for the ready-ground product. Ready size-reduced grinding stock is removed via the fine stock outlet during the ongoing operation of the agitator ball mill, whilst the grinding
P-ph0365-DE / P1001 ODE 24.11.2014 -3 - bodies are held back in the grinding chamber by means of a separating device or classifying device. The agitator ball mill can further comprise a coarse stock outlet.
The coarse stock outlet is preferably closed during the ongoing operation of the agitator ball mill. It can be opened to empty the grinding chamber, in order that the interior of the grinding container, for example in the course of a change of product, can be cleaned.
The grinding stock is pumped into the agitator ball mill via the material inlet by means of an external pump.
According to an embodiment of the invention, the material inlet is preferably constituted as a central opening in the second end wall in the case of agitator ball mills with one driven agitator, said end wall lying opposite the first end wall with the mounting of the drive shaft. The fine stock outlet is often constituted in the region the mounting of the drive shaft at the first end wall. A separating device or classifying device with a rotor for separating and retaining the grinding bodies in the grinding chamber is assigned to the fine stock outlet. The coarse stock outlet is preferably arranged in a region of the cylindrical lateral surface of the grinding stock container.
According to an embodiment of the invention, the material inlet in the case of agitator ball mills with two driven agitators is preferably arranged in a central upper region of the cylindrical lateral surface of the grinding stock container. The fine stock outlet is usually constituted in the region of the mounting of the one drive shaft and the coarse stock outlet is constituted in the region of the mounting of the other drive shaft mounted in the opposite end wall. The respective material outlet for fine stock and coarse stock comprises in each case a separate separating device each with a separate drive. The separating device or classifying device serves to retain the grinding bodies in the grinding chamber when ground product is removed from the grinding chamber. In this embodiment of an agitator ball mill with two driven agitators, it is possible, when use is made of drive shafts with a different geometry and speed, to utilise the possibility of separating two fractions, in particular a fine and a coarse product by means of the agitator ball mill, wherein the grinding bodies usually remain in the grinding chamber.
P-ph0365-DE / P1001 ODE 24.11.2014 -4-
The aim of the invention is in particular to be able to adjust and adapt the circulation of product and auxiliary grinding bodies inside the grinding chamber, in particular in the region of the rotor of the separating device. According to the invention, the internal volume of the grinding chamber in the region of the separating device and/or the flow cross-section inside the grinding chamber in the region of the separating device is adjusted on the basis of the throughput of grinding stock through the agitator ball mill and/or on the basis of other physical parameters of the grinding stock and/or the agitator ball mill. In particular, the adjustment takes place depending on the pump speed of the external pump for the grinding stock.
The adjustment preferably takes place by means of an adjusting device arranged inside the grinding container, said adjusting device comprising at least one volume-variable and/or position-variable element.
According to a preferred embodiment, the adjusting device comprises an elastic element, the spatial volume whereof is adjustable. In particular, the spatial volume occupied by the elastic element can be adjusted by filling with a fluid and/or by emptying. According to an embodiment of the invention, the elastic element comprises an internal cavity, which can be filled with a suitable fluid in order to change the spatial volume occupied by the elastic element. When the internal cavity is filled with fluid, the elastic element expands and thus has an increased spatial volume. The elastic element thus occupies more space inside the grinding chamber, as a result of which the internal volume of the grinding chamber for the grinding stock is reduced. If, on the other hand, fluid is removed from the internal cavity of the elastic element, the elastic element is correspondingly reduced in size. To adjust the size of the elastic element, use is preferably made of incompressible media, for example water or suitable oils. The internal volume of the grinding chamber in the region of the separating device changes and/or the flow cross-section inside the grinding chamber in the region of the separating device changes as a result of the change in the spatial volume occupied by the elastic element.
According to an alternative embodiment, the adjusting device comprises a position-variable element, which is mounted displaceably with respect to the separating device. The distance between the position-variable element and the separating device can be adjusted, wherein the internal volume of the grinding
P-ph0365-DE / P1001 ODE 24.11.2014 -5- chamber in the region of the separating device and/or the flow cross-section inside the grinding chamber in the region of the separating device is reduced by moving the position-variable element closer to the separating device.
According to an embodiment of the invention, the adjustment of the internal volume of the grinding chamber and/or the adjustment of the flow cross-section inside the grinding chamber in the region of the separating device takes place on the basis of a pressure difference between the fine stock outlet and the material inlet of the agitator ball mill. For example, provision can be made such that a pressure sensor is fitted respectively at the fine stock outlet and the material inlet and that the agitator ball mill comprises a control unit. The pressure sensors are coupled to the control unit. The pressure sensors determine the pressure at the respective measurement point and transmit these values to the control unit. The latter calculates the current pressure difference between the fine stock outlet and the material inlet of the agitator ball mill, compares the ascertained value with the previously known setpoint value and, on the basis of the ascertained difference between the actual value and the setpoint value, controls the adjusting device and thus the correct adjustment of the internal volume of the grinding chamber in the region of the separating device and/or the correct adjustment of the flow cross-section inside the grinding chamber in the region of the separating device.
According to an alternative embodiment, the adjustment of the adjusting device takes place on the basis of the power consumption of the agitator ball mill. In particular, the change in the power consumption of the agitator ball mill is measured when there is a change in the delivery quantity and the adjustment of the adjusting device is then regulated and controlled. From the value of the power consumption of the agitator ball mill, a conclusion can in particular be drawn as to whether the grinding bodies are present or not in the separating region. If, for example, an increase in the power consumption is measured when there is an increase in the delivery quantity, the internal volume of the grinding chamber in the region of the separating device and/or the flow cross-section inside the grinding chamber in the region of the separating device is increased, for example by removing fluid from the internal cavity of the elastic element or by increasing the distance between the position-variable element and the separating device.
P-ph0365-DE / P1001 ODE 24.11.2014 -6-
According to a further embodiment of the invention, the rotor of the separating device generates a product flow directed away from the drive shaft of the agitator.
This product flow is split up outside the rotor into a first partial flow directed towards a drive-side end wall of the grinding container, the so-called short-circuit flow, and a second partial flow directed towards at least one agitator disc of the agitator, the so-called return flow. By means of the adjusting device, the quantitative distribution of the product flow into the first partial flow or the second partial flow can be adjusted in a targeted manner and can be adapted to the pump speed of the external pump. That is to say that, depending on the material supply generated by the external pump, an adjustment can be made as to whether the product flow generated by the rotor is conveyed to a greater or lesser extent in the direction of the agitator disc or in the direction of the drive-side end wall.
The essence of the invention, therefore, is an adjusting device for adjusting the circulation of an agitator ball mill inside the grinding chamber. The adjusting device is arranged in the region of the separating device at the material outlet of the agitator ball mill, preferably on a non-rotating component.
The functional component of the adjusting device is a variable element in the region of the respective separating device, which is regulated by the differential pressure between the fine stock outlet and the material inlet of the agitator ball mill or the power consumption of the agitator ball mill. The changes to the variable element lead to changes in the distance between rotating and stationary parts of the agitator ball mill and thus lead to changes to the flow cross-section and/or the product flows inside the mill.
To be able to adapt the adjusting device to the throughput in the agitator ball mill, pressure is applied to the latter or pressure is reduced in an embodiment. The greatest internal product throughput is possible when the pressure on the device is virtually zero and the device clears the maximum flow cross-section inside the grinding chamber. In an embodiment with an elastic element, which lies almost completely adjacent to the container wall, the adjusting device is subjected to pressure from the rear, i.e. from the container side, when there is a lower throughput in the agitator ball mill. The elastic element is thus increased in size and so reduces the cross-section of the agitator ball mill in the region of the separating device, the
P-ph0365-DE / P1001 ODE 24.11.2014 -7- space or distance between the grinding container and the separating device in particular being reduced.
The delivery capacity and flows around the separating device, i.e. in particular in the outlet region of the agitator ball mill, can be adapted and adjusted with the aid of 5 the adjusting device and with the aid of the described method. The dwell time spectrum of the product in the grinding chamber can thus be varied without changing the pump throughput. The wear on the separating device can thus be reduced. In particular, the size of an agitator ball mill can thus be used in the optimum manner for different throughput quantities. 10
Description of the figures
Examples of embodiment of the invention and their advantages are explained in greater detail below with the aid of the appended figures. The size ratios of the individual elements with respect to one another in the figures do not always 15 correspond to the actual size ratios, since some forms are represented simplified and other forms are represented enlarged in relation to the other elements for the sake of better illustration.
Figure 1 shows a cross-section through a first embodiment of a ball mill with a driven agitator according to the prior art. 2 0 Figures 2 to 4 each show a cross-section through different embodiments of a ball mill according to the invention.
Identical reference numbers are used for identical or identically acting elements of the invention. Furthermore, for the sake of a clearer view, only reference numbers are represented in the individual figures that are required for the description of the 25 respective figure. The represented embodiments only represent examples as to how the device according to the invention can be constituted and do not represent a conclusive limitation.
Figure 1 shows a cross-section through a first embodiment of a ball mill 1 with an agitator 5 driven by a drive 3 according to the prior art. In particular, it is an agitator
P-ph0365-DE / P1001 ODE 24.11.2014 -8- ball mill 2 with a horizontally arranged cylindrical grinding container 7. Agitator 5, which in the shown example of embodiment comprises four agitator discs 5*, is caused to rotate by means of a drive 3 and an assigned drive shaft 4 and thus provides for the intensive motion of the grinding bodies together with the grinding stock inside grinding chamber 8. Drive shaft 4 is sealed by means of a slip-ring seal 6 and is mounted outside in a first end wall 15a of horizontal grinding container 7. A central opening as a material inlet 13 is constituted in opposite second end wall 15b, via which central opening the material to be sized-reduced and/or the grinding bodies are filled into grinding chamber 8. The removal of the ground product takes place in the shown example via a fine stock outlet 11 in first end wall 15a. The grinding bodies are held back by a separating device 10 or classifying device 10*. The fine stock flows radially through holes in a sieve of separating device 10. The sieve is fixed to end wall 15a in such a way that outflowing product can only leave grinding chamber 8 through the sieve openings. A rotor 50 is arranged between a drive-side first agitator disc 5* of agitator 5 and drive-side first end wall 15a. Said rotor comprises in particular a rotor disc 52 with openings 53 for the material to be sized-reduced and the grinding bodies. So-called rotor fingers 55 are arranged at the outer edge of rotor disc 52, said rotor fingers extending in the direction of drive-side first end wall 15a. Rotor fingers 55 are arranged in particular uniformly spaced apart from one another. Rotor fingers 55 are connected to one another at their drive-side end by a rotor ring 57. Rotor 50 thus forms a drive-side open cage around the axis of drive shaft 4.
The material to be sized-reduced is pumped with the aid of an external pump via material inlet 13 in flow direction Fa in a volume flow va into grinding chamber 8 of grinding container 7. In particular, it passes through openings 60 in agitator discs 5* and openings 53 of rotor disc 52 into the intermediate space between the rotor cage and the sieve of separating device 10. When drive shaft 4 rotates, rotor 50 acts as a pump and builds up a product flow comprising material to be sized-reduced and material already at least partially size-reduced in flow direction Fb directed outwards into grinding chamber 8. Rotor 50 sucks the product flow close to drive shaft 4. The grinding bodies have a higher density than the material to be sized-reduced. For this reason, no grinding bodies or only a small number of grinding bodies are located at
P-ph0365-DE / P1001 ODE 24.11.2014 -9- drive shaft 4 on account of the centrifugal forces inside agitator ball mill 2. The product flow generated by rotor 50 thus at least for the most part comprises only material to be sized-reduced or material already at least partially size-reduced.
The product flow built up by rotor 50 has in particular a higher volume flow vb than the material supply via material inlet 13. The product flow is split up outside the rotor cage into a partial flow Fc in the direction of agitator disc 5* and into a partial flow Fd in the direction of drive-side first end wall 15a. This partial flow Fd flows around the rotor ring and the size-reduced material leaves agitator ball mill 2 via the sieve of separating device 10 at fine stock outlet 11. Partial flow Fc directed in the direction of agitator disc 5* counteracts the external pump and therefore the material supply in flow direction Fa. As a result of partial flow Fc, the grinding bodies present at the container inner wall of grinding container 7 are entrained in the direction of agitator disc 5*.
The return delivery speed of the product flow is defined in the case of a rotor 50 with a constant geometry and a constant speed. The throughput of agitator ball mill 2 is adapted by changing the pump speed of the external pump. The point at which the forces of the external pump (flow direction Fa) and the return delivery force in flow direction Fc cancel out is displaced inside agitator ball mill 2.
Furthermore, it is indicated in figure 1 that the inner lateral surface of grinding container 7 is provided with wear protection elements 12 to protect against wear. Agitator ball mill 2 with only one drive 3 thus comprises a material inlet 13, an outlet for fine stock 11 and a classifying device 10*.
Figures 2 to 4 each show a cross-section through different embodiments of a ball mill 20 according to the invention. They are each agitator ball mills 22 with a drive 3 similar to figure 1. The same reference numbers as in the description in respect of figure 1 are used for the components of ball mills 20 known from the prior art. Reference is therefore made to the description in respect of figure 1 for the description of these components.
The essence of the invention is an adjusting device 30 for adjusting the circulation of an agitator ball mill 22 inside the grinding chamber. Adjusting device 30 serves in particular to adapt the return delivery capacity of rotor 50. Adjusting device
P-ph0365-DE / P1001 ODE 24.11.2014 - 10 - 30 is arranged in the region of separating device 10, 14 (see figure 1) at material outlet 11 of agitator ball mill 2, preferably on a non-rotating component.
Figures 2 to 4 show, by way of example, the arrangement of adjusting devices 30 in an agitator ball mill 22 with one drive 3. Adjusting device 30 comprises a variable element 32 in the region of respective separating device 10. It is for example an elastic element 33 which is volume-variable. The spatial volume of elastic element 33 can for example be increased by inflation or filling with a suitable fluid. The spatial volume occupied by elastic element 33 is reduced again by draining fluid.
Alternatively, a so-called displacement body can be used as variable element 32, said displacement body being able to be displaced, as a result of which the internal volume of grinding chamber 8 or the flow cross-section inside grinding chamber 8 in the region of separating device 10 is increased or reduced. A pressure difference exists inside grinding container 7 between fine stock outlet 11 and material inlet 13. The pressure at fine stock outlet 11 and material inlet 13 is ascertained in each case by means of suitable sensors 40-13, 40-11. The measured data for the pressure are transmitted to a control unit (not represented).
The latter calculates differential pressure Δρ and then triggers an adjusting means 42 depending on present volume flow va for the adaptation of variable element 32. The change to variable element 32, i.e. either the change in the spatial volume occupied by the elastic element or the change in the position of the displacement body, leads to changes in the distance between rotating and stationary parts of agitator ball mill 22. This brings about a change in the flow cross-section inside the grinding chamber and therefore a change in the product flows inside the mill.
To be able to adapt adjusting device 30 to the throughput in agitator ball mill 22, pressure is applied to the latter or pressure is reduced by adjusting means 42 in the embodiments represented according to figures 2 to 4, so that the spatial volume of adjusting device 30 is correspondingly changed. The greatest internal product throughput is possible when the pressure on adjusting device 30 is virtually zero and adjusting device 30 clears the maximum flow cross-section inside the grinding chamber.
P-ph0365-DE / P1001 ODE 24.11.2014 - 11 -
With adjusting device 30 according to figure 2, the distance between rotor ring 57 and drive-side first end wall 15a of grinding chamber 7 can be changed. If the gap between rotor ring 57 and drive-side first end wall 15a approaches zero, the so-called short-circuit flow in flow direction Fd is cancelled out and the entire product flow delivered by rotor 50 has only flow direction Fc in the direction of agitator discs 5*.
Figure 3 shows an embodiment with an elastic element 33, which lies almost completely adjacent to the container wall of grinding container 7. With adjusting device 30 according to figure 3, the distance between rotor disc 52 and the grinding container inner wall can be changed. If the gap between rotor disc 52 and the grinding container inner wall approaches zero, the material flow in flow direction Fc in the direction of agitator disc 5* is cancelled out and the entire product flow delivered by rotor 50 has only flow direction Fd in the direction of drive-side first end wall 15a. No return delivery of material in the direction of the grinding discs thus first takes place. This is especially the case when volume flow va generated by the external pump corresponds to the speed of product volume flow vb generated by rotor 50 (see figure 1).
If the throughput in agitator ball mill 22 is smaller, adjusting device 30 is subjected to pressure from the rear, i.e. from the container side, and thus reduces the cross-section of grinding chamber 8 in the region of separating device 10. In particular, the space between grinding container 7 and separating device 10 is reduced. For example, provision can be made such that adjusting device 30 comprises individual segments and provision can be made such that the pressure is applied in each case in a targeted manner in individual segments, in order thus to achieve a highly targeted adjustment of the flow cross-section in defined regions of grinding chamber 8.
The return delivery capacity of rotor 30 of separating device 10 in the outlet region of agitator ball mill 22 can be adjusted with the aid of adjusting device 30. In particular, an adaptation can be made as to whether more of the product flow pumped by rotor 50 is pumped back in the direction of agitator disc 5* or in the direction of drive-side first end wall 15a. This enables a particularly advantageous distribution of the grinding bodies in grinding chamber 8. The grinding bodies must in particular be distributed widely around agitator disc 5*, in order to achieve good grinding of the product to be sized-reduced. The dwell time spectrum of the product in grinding
P-ph0365-DE / P1001 ODE 24.11.2014 -12 - chamber 8 can thus be varied without changing the pump throughput. Furthermore, the output quantity of fine and/or coarse stock can be adjusted with the aid of adjusting means 42 and adjusting device 30. The size of an agitator ball mill 22 can thus be used in the optimum manner for different throughput quantities of grinding 5 stock.
By adjusting the dwell time spectrum of the product in grinding chamber 8, the contact time between grinding stock or grinding bodies and separating device 10, 14 can be optimised, in particular minimised. Shorter contact times produce less wear and thus increase the service life of separating devices 10, 14.
10 The invention has been described by reference to a preferred embodiment. A person skilled in the art can however imagine that modifications or changes to the invention can be made without thereby departing from the scope of protection of the following claims. 15
List of reference numbers 1 Ball mill 2 Agitator ball mill 3 Drive 4 Drive shaft 5 Agitator 5* Agitator disc 6 Slip-ring seal 7 Grinding container 8 Grinding chamber 10 Separating device 10* Classifying device 11 Fine stock outlet 12 Wear protection 13 Material inlet
P-ph0365-DE / P1001 ODE 24.11.2014 - 13 - 14 Separating device 15 End wall 20 Ball mill 22 Agitator ball mill 30 Adjusting device 32 Variable element 33 Elastic element 40 Pressure sensor 42 Adjusting means 50 Rotor 52 Rotor disc 53 Opening 55 Rotor finger 57 Rotor ring 60 Opening F Flow direction v Volume flow
Claims (15)
- Claims1. A method for regulating the delivery capacity of a rotor (50) of a separating device (10) of an agitator ball mill (20, 22) for the size-reduction of grinding stock with the aid of grinding bodies, wherein the agitator ball mill (20, 22) comprises a preferably cylindrically constituted, horizontally arranged grinding container (7), at least one agitator (5) driven by means of a drive (3), a material inlet (13) and a fine stock outlet (11), wherein a separating device (10, 14) with a rotor (50) for holding back the grinding bodies is assigned at least to the fine stock outlet (11), wherein the grinding stock is pumped into the agitator ball mill (20, 22) via the material inlet (13) by means of an external pump, characterised in that the internal volume of the grinding chamber (8) in the region of the at least one separating device (10, 14) and/or that a flow crosssection inside the grinding chamber (8) in the region of the separating device (10, 14) of the agitator ball mill (22) is adjusted depending on a pump speed of the external pump.
- 2. The method according to claim 1, wherein the adjustment of the internal volume of the grinding chamber (8) in the region of the at least one separating device (10, 14) and/or the adjustment of the flow cross-section inside the grinding chamber (8) in the region of the separating device (10, 14) takes place by means of an adjusting device (30), which comprises at least one volume-variable and/or position-variable element (32).
- 3. The method according to claim 2, wherein the adjusting device (30) comprises an elastic element (33), the spatial volume whereof is adjustable.
- 4. The method according to claim 2, wherein the spatial volume can be adjusted by filling an internal cavity of the elastic element (33) with a fluid and/or by emptying the internal cavity of the elastic element (33), wherein the spatial volume occupied by the elastic element (33) is increased by filling with fluid and the internal volume of the grinding chamber (8) in the region of the separating device (10, 14) and/or the flow cross-section inside the grinding chamber (8) in the region of the separating device (10, 14) is reduced.
- 5. The method according to claim 2, wherein the adjusting device (30) comprises a position-variable element, which is mounted displaceably with respect to the separating device, and wherein the distance between the position-variable element and the separating device (10, 14) can be adjusted, wherein the internal volume of the grinding chamber (8) in the region of the separating device (10, 14) and/or the flow cross-section inside the grinding chamber (8) in the region of the separating device (10, 14) is reduced by moving the position-variable element closer to the separating device (10, 14).
- 6. The method according to any one of the preceding claims, wherein the adjustment of the internal volume of the grinding chamber (8) in the region of the separating device (10, 14) and/or the adjustment of the flow cross-section inside the grinding chamber (8) in the region of the separating device (10, 14) takes place on the basis of a pressure difference (Δρ) between the fine stock outlet (11) and the material inlet (13) of the agitator ball mill (20, 22).
- 7. The method according to claim 6, wherein the pressure difference (Δρ) is ascertained by means of sensors and wherein the adjustment of the internal volume of the grinding chamber (8) in the region of the separating device (10, 14) and/or the adjustment of the flow cross-section inside the grinding chamber (8) in the region of the separating device (10, 14) is controlled by means of a control unit.
- 8. The method according to any one of claims 1 to 4, wherein the adjustment of the internal volume of the grinding chamber (8) in the region of the separating device (10, 14) and/or the adjustment of the flow cross-section inside the grinding chamber (8) in the region of the separating device (10, 14) is calculated on the basis of the change in the power consumption of the agitator ball mill (20, 22) when there is a change in the delivery quantity.
- 9. The method according to any one of claims 2 to 8, wherein the rotor (50) of the separating device (10, 14) generates a product flow (Fb) directed away from a drive shaft (4) of the agitator (5), wherein the product flow (Fb) is split up into a first partial flow (Fd) directed towards a drive-side end wall (15a) of the grinding container (7) and a second partial flow (Fc) directed towards at least one agitator disc (5*) of the agitator, wherein, by means of the adjusting device (30), the quantitative distribution of the product flow (Fb) into first partial flow (Fd) and second partial flow (Fc) is adjusted in a targeted manner and adapted to the pump speed of the external pump.
- 10. An agitator ball mill (20, 22) for the size-reduction of grinding stock with the aid of grinding bodies, with a preferably cylindrically constituted, horizontally arranged grinding container (7), with at least one agitator (5) driven by means of a drive (3), wherein the at least one drive shaft (4) of the agitator (5) is mounted in a mobile manner in a side wall (15) of the grinding container (7), wherein the agitator ball mill (20, 22) comprises a material inlet (13) and a fine stock outlet (11), wherein a separating device (10, 14) with a rotor (50) for holding back the grinding bodies is assigned at least to the fine stock outlet (11), wherein an external pump for pumping grinding stock via the material inlet (13) is assigned to the agitator ball mill (20, 22), characterised in that the agitator ball mill (20, 22) comprises an adjusting device (30), by means of which the internal volume of the grinding chamber (8) and/or a flow crosssection inside the grinding chamber (8) in the region of the separating device (10, 14) can be adjusted.
- 11. The agitator ball mill (20, 22) according to claim 10, wherein the adjusting device is arranged in the region of a separating device (10, 14) at a material outlet (9*, 11) on a non-rotating component of the agitator ball mill (20, 22).
- 12. The agitator ball mill (20, 22) according to claim 10 or 11, wherein the adjusting device (30) comprises at least one volume-variable and/or position-variable element (32).
- 13. The agitator ball mill (20, 22) according to claim 12, wherein the adjusting device (30) comprises an elastic element (33) with an internal cavity, wherein the volume of the elastic element (33) can be adjusted by filling the internal cavity with a fluid and/or by at least partial emptying of the cavity at least partially filled with a fluid.
- 14. The agitator ball mill (20, 22) according to claim 10 or 11, wherein the adjusting device (30) comprises a position-variable element (32), which is arranged displaceably with respect to the separating device, wherein the distance between the position-variable element (32) and the separating device (10, 14) is adjustable.
- 15. The agitator ball mill (20, 22) according to any one of claims 10 to 14, wherein a pressure sensor (40) is assigned respectively to the fine stock outlet (11) and the material inlet (13) and wherein the agitator ball mill comprises a control unit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014117188.8 | 2014-11-24 | ||
| DE102014117188.8A DE102014117188B3 (en) | 2014-11-24 | 2014-11-24 | Method for regulating the delivery rate of a rotor of a separating device of a stirred ball mill and agitator ball mill for comminuting material to be ground |
| PCT/DE2015/000548 WO2016082812A1 (en) | 2014-11-24 | 2015-11-18 | Method for regulating the delivery capacity of a rotor of a separating device of a stirred ball mill, and stirred ball mill for comminuting material to be ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2015353141A1 true AU2015353141A1 (en) | 2017-07-13 |
| AU2015353141B2 AU2015353141B2 (en) | 2018-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| AU2015353141A Active AU2015353141B2 (en) | 2014-11-24 | 2015-11-18 | Method for regulating the delivery capacity of a rotor of a separating device of a stirred ball mill, and stirred ball mill for comminuting material to be ground |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP3223950B1 (en) |
| AU (1) | AU2015353141B2 (en) |
| DE (1) | DE102014117188B3 (en) |
| ES (1) | ES2693062T3 (en) |
| WO (1) | WO2016082812A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527038A (en) * | 2022-02-22 | 2022-05-24 | 佛山市天劲新能源科技有限公司 | Polymer battery production batching stirring viscosity measurement system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105833950A (en) * | 2016-05-16 | 2016-08-10 | 怡成屏障（张家港）科技有限公司 | Coating sand mill for producing environment-friendly and low-carbon coating |
| PL3311922T3 (en) * | 2016-10-18 | 2019-05-31 | Bachofen Willy A Ag | Agitator ball mill |
| CN109909021B (en) * | 2019-02-28 | 2021-01-29 | 邓埔芳 | A high-efficient type ball mill that grinds evenly for coal chemical industry |
| CN112138793B (en) * | 2020-09-18 | 2022-02-18 | 佛山市迈海新材料科技有限公司 | Anti-skidding and anti-seismic coating production equipment |
| EP4049758A1 (en) * | 2021-02-24 | 2022-08-31 | Bühler AG | Wear resistant rotor |
| CN115591634B (en) * | 2022-10-12 | 2023-11-03 | 深圳市尚水智能股份有限公司 | Vertical medium grinds machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3249928C3 (en) * | 1982-12-10 | 1995-06-29 | Buehler Ag Geb | Agitator mill |
| DE3839780A1 (en) * | 1988-11-25 | 1990-05-31 | Buehler Ag Geb | Method for controlling and/or regulating a stirring mill, and a stirring mill for carrying out the method |
| DE4009092C1 (en) * | 1990-03-21 | 1991-05-23 | Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De | |
| DE4432200C1 (en) * | 1994-09-09 | 1996-02-29 | Evv Vermoegensverwaltungs Gmbh | Agitator mill |
| DE19830960C2 (en) * | 1998-07-10 | 2002-12-12 | Netzsch Erich Holding | Separating device for an agitator mill |
-
2014
- 2014-11-24 DE DE102014117188.8A patent/DE102014117188B3/en active Active
-
2015
- 2015-11-18 AU AU2015353141A patent/AU2015353141B2/en active Active
- 2015-11-18 EP EP15825915.0A patent/EP3223950B1/en active Active
- 2015-11-18 ES ES15825915.0T patent/ES2693062T3/en active Active
- 2015-11-18 WO PCT/DE2015/000548 patent/WO2016082812A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527038A (en) * | 2022-02-22 | 2022-05-24 | 佛山市天劲新能源科技有限公司 | Polymer battery production batching stirring viscosity measurement system |
| CN114527038B (en) * | 2022-02-22 | 2022-09-30 | 佛山市天劲新能源科技有限公司 | Polymer battery production batching stirring viscosity measurement system |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3223950B1 (en) | 2018-08-01 |
| WO2016082812A1 (en) | 2016-06-02 |
| DE102014117188B3 (en) | 2016-05-12 |
| EP3223950A1 (en) | 2017-10-04 |
| ES2693062T3 (en) | 2018-12-07 |
| AU2015353141B2 (en) | 2018-08-30 |
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