WO2006000112A1 - System und verfahren zur mahlgut-charakterisierung in einem walzenstuhl - Google Patents
System und verfahren zur mahlgut-charakterisierung in einem walzenstuhl Download PDFInfo
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- WO2006000112A1 WO2006000112A1 PCT/CH2005/000242 CH2005000242W WO2006000112A1 WO 2006000112 A1 WO2006000112 A1 WO 2006000112A1 CH 2005000242 W CH2005000242 W CH 2005000242W WO 2006000112 A1 WO2006000112 A1 WO 2006000112A1
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- camera
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- sample
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- particles
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- 238000000227 grinding Methods 0.000 title claims abstract description 57
- 239000000463 material Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 26
- 238000004458 analytical method Methods 0.000 claims abstract description 7
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- 238000001514 detection method Methods 0.000 claims description 25
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
-
- 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
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1456—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals
- G01N15/1459—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals the analysis being performed on a sample stream
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N15/1429—Signal processing
- G01N15/1433—Signal processing using image recognition
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
- G01N2001/2007—Flow conveyors
- G01N2001/2014—Pneumatic conveyors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/14—Optical investigation techniques, e.g. flow cytometry
- G01N2015/1497—Particle shape
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/02—Food
- G01N33/10—Starch-containing substances, e.g. dough
Definitions
- the invention relates to a system and a method for grinding stock characterization in a roll mill with a roll pass formed by a pair of rolls.
- the granular material When grinding granular material, such as e.g. Wheat, in a roll mill, the granular material is crushed between the rolls of the roll pair.
- the millbase In order to obtain flour of a certain fineness, the millbase generally has to be passed several times through such a passage, with classifications being carried out by windscapes and screening in between. Thus, flours can be obtained with different finenesses or different degree of grinding.
- the grinding effect of a passage depends mainly on the gap distance between the two rolls of a pair of rolls.
- roller mill operating parameters which influence the grinding effect of a passage. It is therefore desirable to obtain a characterization of the ground material which emerges after a certain passage. If a deviation of the material to be ground from a desired grinding characteristic occurs, a correction of the gap distance or, if necessary, of a further roller mill operating parameter can be carried out on the basis of this deviation in order to compensate for the deviation as quickly as possible.
- the invention has for its object to provide a system and a method rectifzustel ⁇ len, which allows characterization of the emerging from a Mahlpassage ground material in a roll mill.
- the system according to the invention comprises a removal means after the roller passage for removing a sample of grinding stock from the millbase leaving the roller passage; a performance section for conveying and presenting the removed sample of regrind; a detection means for detecting the Mahlgutprobe conveyed through the Darbietungs ⁇ section through; and an analyzing means for analyzing the detected millbase sample.
- the method according to the invention comprises the following steps: removal of a sample of grinding stock from the millbase stream leaving the roller passage; Conveying and presenting the removed sample of ground material in a presentation section; Detecting the sample of millbase conveyed through the presentation section; and analyzing the detected millbase sample.
- a deagglomeration section for deagglomerating regrind agglomerates in the mill sample is provided downstream of the removal means and upstream of or in the presentation section. This prevents that agglomerates of several regrind particles are erroneously detected and identified as large millbase particles.
- the sampling means may be connected via a pneumatic line to the presentation section such that the sample of ground material can be conveyed through the pneumatic line and the presentation section along a flow path.
- the system according to the invention can also be attached to a location remote from the roller mill within a mill, whereby the design freedom is increased in the design of a mill plant.
- the presentation section has two opposite walls, between which a gap is formed, wherein the two opposite walls are preferably mutually parallel planar surfaces.
- the pneumatic line mentioned above opens into a gap in the gap formed between the opposing walls, wherein the flow path in the mouth region preferably has a direction change.
- the direction change of the flow path is in particular between 30 ° and 90 ° and is preferably between 80 ° and 90 °. This leads to particularly large momentum changes in the mitge led Mahlgut particles in their deflecting bumps and thus to a particularly pronounced impact effect.
- the detection means has a camera for detecting elektro ⁇ magnetic radiation or electromagnetic frequencies, in particular optical frequencies, the camera is preferably directed into the gap or to the gap.
- the opposite walls of the presentation section are permeable to electromagnetic radiation detectable by the camera, in particular optical frequencies.
- the camera can optionally be placed on either side of the gap behind one of the walls.
- the camera is arranged on one side of the gap on one of the two permeable walls, and a source of electromagnetic radiation, in particular a light source, for the electromagnetic radiation detectable by the camera is located on the the other side of the gap is arranged on the other side of the gap on the other of the two permeable walls.
- the first wall for electromagnetic radiation detectable by the camera in particular optical frequencies, permeable
- the second Wall for the detectable by the camera electromagnetic frequencies, in particular optical frequencies, impermeable and more absorbent than the Mahlgutpar ⁇ is particles.
- the camera is arranged on one side of the gap on the permeable wall, and a source of electromagnetic radiation, in particular a light source, for the detectable by the camera elektro ⁇ magnetic radiation on the same side of the gap gap arranged on theteur ⁇ casual wall.
- a source of electromagnetic radiation in particular a light source
- the millbase sample conveyed through the gap can be irradiated, and the scattered light or the reflection of the particles of the mill sample reaches the field of view of the camera.
- the gap-side surface of the second wall has a stronger absorption of the electromagnetic radiation emitted by the source than the surfaces of the millbase particles. This ensures that there is sufficient contrast between the reflective, regrind particles which move in front of the gap-side surface and the light reflected by the wall, so that an easy detection of the imaged millbase particles can take place and the subsequent Image processing is much easier. This saves complex and time-consuming filter processes in image processing.
- the two opposite walls each have a cleaning device associated with the two opposite walls can be freed from adhering to them Mahlgut particles. This ensures that not too many dormant, that is adhering to one or the other wall regrind particles are imaged into the camera.
- the particle size distribution of the particles of regrind adhering to the walls is, as a rule, different from the regrind particles entrained in the millbase stream. If it is desired to dispense with a distinction between stationary and moving regrind particles during the detection and processing of the regrind stream image information, such wall rubbing should therefore be carried out regularly in order to "shake off" the particles adhering to the walls.
- the cleaning device can be a source of vibration, in particular an ultrasound source, which is in each case rigidly connected to the two opposite walls in order to be able to vibrate the two walls.
- a source of vibration in particular an ultrasound source, which is in each case rigidly connected to the two opposite walls in order to be able to vibrate the two walls.
- the cleaning device can also be a vibration source, in particular an ultrasonic source, with which the gaseous medium can be vibrated between the two opposite walls.
- a vibration source in particular an ultrasonic source, with which the gaseous medium can be vibrated between the two opposite walls.
- the deagglomeration section is preferably a baffle in the entrance area of the presentation section.
- the deagglomeration effect by impact and momentum transfer to agglomerates and the airborne sound version of the wall cleaning device for deagglomeration of entrained in the air Mahlgut- particles contribute, if necessary, one after the other or working simultaneously with different ultrasonic frequencies Son ⁇ .
- the change in direction of the flow path is preferably in the entry region of the presentation section.
- the presentation section or the "window" is larger than the field of view of the camera, the camera then only detecting a subregion of the presentation section. This allows the camera within the performance area Place at a location on the wall or the window, where a minimal separation of the regrind particles within the Mahlgutstromes is to be expected.
- the presentation section or the window is larger than the field of view of the camera, several cameras can also each capture a subregion of the presentation section. As a result, an averaging of different regrind images from different locations within the presentation section can be achieved. If segregation of the millbase stream takes place at the various subsections, this averaging can be used to compensate for such deletions at least partially, so that the averaged aggregate of the information from the respective millbase flow deflections for the particle size distribution throughout the millbase stream is representative.
- the plurality of cameras are each selectively controllable, so that selective sections of the grinding stock image can be used on the image sensor and averaged.
- the presentation section can essentially correspond to the entire field of view of the camera, with the image sensor of the camera then being selectively controllable, so that selective sections of the regrind image can be used on the image sensor.
- selective activation preferably takes place purely by chance, specifically by activation by means of a random generator.
- the system according to the invention comprises a plurality of removal means arranged along the axial direction of the roller passage after the roller passage, wherein preferably a first removal means in the region of the first axial end of the roller passage and a second removal means in the region of the second axial end of Roller passage is arranged.
- the light source and the camera are connected to a control device which can synchronously switch the light source and the camera on and off so that a sequence of stroboscopic images takes place. It is also possible to provide several light sources or stroboscopic flash units which can be operated simultaneously but differently, in particular with regard to the duration of the flash and the intensity of the flash.
- the analysis means preferably has an image processing system.
- This image processing system preferably has means for distinguishing between moving regrind particles and gristle particles adhering to the walls in the grit particles imaged and detected by the camera in the projection mode or in the reflection mode.
- the image particles which are adhering to the stationary, stationary regrind particles can be disregarded in the evaluation during image processing, so that only the moving millbase particles are used for the evaluation. As a result, a falsification of the particle size distribution of the ground material is avoided, as described above.
- the millbase sample is preferably taken from the millbase leaving the roller passage at various points, so that, as explained above, information about the relative roll orientation of the pair of passages can be obtained.
- the millbase sample thus obtained is then preferably conveyed through the presentation section in a radial flow.
- the radial flow velocity decreases in the radial direction from the inside to the outside.
- the loading of the transport fluid eg pneumatic air
- the transport fluid is substantially constant radially from inside to outside, ie the number of millbase particles per unit volume is also essentially constant towards the outside, so that the probability of particle overlays in the imaging of the projection image or reflection image over the radial region is substantially constant.
- the loading of the transport fluid can be varied.
- the sample passed through the presentation section is recorded only in partial areas.
- the entire detection e.g. between a first subarea, in which initially a first part of the acquisition takes place, to at least one further subarea, in which subsequently a further part of the acquisition takes place, at least once.
- the evaluation results of the different detection sub-range can then be averaged to achieve the most representative possible characterization of the entire Mahlgutstromes.
- the respectively detected subareas of the presentation section are selected zu ⁇ due.
- the removed samples of ground material are conveyed pneumatically from the picking to the presentation, wherein preferably the removal, the presentation, the detection and the analysis of the samples of ground material take place continuously.
- the removal, the presentation, the detection and the analysis of the samples of ground material take place continuously.
- Mahlgutprobenstroms The detection of the continuous Mahlgutprobenstroms is conveniently stroboskopartig by a series of strobe flashes.
- v average flow velocity of the pneumatic medium
- D average particle size or mean particle size of the regrind particles
- Dmin minimum particle size of a regrind particle
- Dmax maximum particle size of a regrind particle.
- the detection preferably takes place by means of a series of stroboscopic flashes, which flash a first sub-series of still-picture stroboscopic flashes having a first on-time T1 and a first light intensity L1 and a second sub-series of trajectory stroboscopic flashes having a second on-time T2 and a second light intensity L2 , satisfying the following relationship: T2> 2 T1.
- a turn-off period T3 between a still-picture strobe flash and a trajectory strobe flash satisfies the relation 2 D ⁇ v T3.
- CCD charge-coupled devices
- the switch-off duration T3 between the still-picture stroboscopic flash and the trajectory strobe flash satisfies the relation 2 D ⁇ v T3 ⁇ 10 D and in particular the relationship 2 D ⁇ v T3 ⁇ 7 D.
- the distance between the respective still image and the respective trajectory is not too great for the once moved as Mahlsent particles and once as trajectory trajectory particles, so that a clear association between the respective still image and the corresponding respective Trajectory of a moving regrind particle is possible.
- the on-time T1 of the still-picture strobe flashes should have the relationship v T1 "D and, in particular, the relationship v T1 ' ⁇ D / 10 meet.
- the duty cycle T2 of the trajectory strobe flashes should satisfy the relationship v T2> D and in particular the relationship v T2> 5 D.
- the light intensity L1 of the still-picture strobe flashes and the light intensity L2 of the runway strobe flashes are different from each other. This can also be used to distinguish the resulting still images and trajectory images.
- the particle still images, to which a particle trajectory can be assigned, can be stored in a first still image memory, so that the respective particle still image information is stored in a still image memory for each completed still image strobe flash and trajectory strobe flash.
- the particle still image information of successive still images can then be statistically evaluated, in order in particular to determine the mean particle size D, its standard deviation, and its statistical distribution.
- the representation can take place by means of a distribution function (differentiated) or by means of a histogram (integrated).
- the regrind characterization system according to the invention is preferably used in a mill and is in each case assigned to a roller mill.
- this roll mill are also assigned:
- a comparison device for comparing a detected Mahlgut- characteristic with a millbase target characteristic; and> an adjusting device for adjusting the gap spacing or, if appropriate, a further roller mill operating parameter as a function of a deviation between the detected grinding stock characteristic and the desired grinding stock characteristic.
- Fig. 1 is a schematic sectional view through part of a system according to the invention for illustrating the course of the grinding material flow
- FIG. 2 is a block diagram of another part of the system according to the invention to illustrate its means for detecting and processing regrind information;
- FIG. 3 shows a part of the detection and processing of grinding material information;
- Fig. 4 shows a specific aspect of the detection and processing of regrind information.
- FIG. 1 shows a schematic sectional view through part of a system according to the invention in order to illustrate the course of the grinding material flow.
- a pair of rollers 2, 4 forms a grinding passage 6 of a roll mill.
- the regrind 1 schematically indicated by bold dots, which may be e.g. is wheat flour with particle sizes in the range of a few 100 microns passes, after its grinding in the Mahl ⁇ passage 6 in a funnel 8, which opens into a pneumatic line 18.
- the grinding stock 1 is transported via this pneumatic line 18 to a gap 10, which extends between a first wall 20 and a second wall 22, which are aligned parallel to one another.
- the millbase 1 enters the nip 10 in an orifice portion 19 and then moves radially outwardly from this orifice portion 19 to enter a transition region 28 through which it is conveyed pneumatically and gravitationally downward and into another pneumatic conduit 30 arrives.
- a camera 12 which is directed towards the gap 10.
- a light source 24 which radiates through the gap 10 through the two walls 20, 22 therethrough.
- the camera 12 detects the shadows projected from the milling particles 1 on their image sensor.
- the light source 24 may alternatively be arranged above the translucent wall 20 next to the camera 12.
- the bottom wall 22 is opaque and has a dark surface on the side of the gap 10.
- the camera 12 detects the light reflected or scattered by the Mahlgutparti ⁇ angles 1 on its image sensor.
- the light source 24 is operated as a stroboscope.
- the shadows of the regrind particles (first version) or the images of the regrind particles (second version) become visible imaged the image sensor of the camera 12 as still images.
- This Mahlgutstrom- Stand ⁇ represent snapshots of the Mahlgutstromes in the gap 10.
- This Scheme ⁇ formation is fed to the camera 12 downstream
- Rickverabeitungssystem 14 in which the Mahlgutstrom-still images are processed to statistical Aus ⁇ say about the size distribution of To make regrind particles.
- a deagglomeration section 16 in the form of a baffle plate.
- the comminution particles 1 transported in via the pneumatic line 18 push against this baffle plate 16 and then undergo a directional deflection by about 90 ° through the conveying air before they enter the gap 10 between the two parallel walls 20, 22.
- agglomerates are effectively dissolved under the Mahlgutpumblen, and arrive de-agglomerated Mahlgutpelle in the gap 10.
- a distortion of the grinding material characterization is prevented by agglomerates in the millbase.
- the pneumatic line 30 opens again into the direction away from the roller mill Lei ⁇ device (not shown).
- the sampled sample 1 removed is fed back to the mill via a suction nozzle (not shown) in order, if necessary, to continue to be ground, screened or wind-screened.
- this "suction" back into the mill cycle by a vacuum cleaner 36 is indicated schematically.
- the pneumatic line 30 is also a branch 32, which forms a Umge ⁇ tion line to the suction 36.
- This branch line 32 contains a throttle valve 34 via which the flow resistance of the branch line 32 can be adjusted.
- the throttle valve 34 of the branch line 32 can be modulated by the throttle valve 34 of the branch line 32, the suction power of the mill (or the "Staub ⁇ sucker" 36). As a result, a fine adjustment of the suction power is possible.
- the grinding stock density must not be too great for optimum operation of the system according to the invention for grinding stock characterization.
- the grinding material speed, the flash duration and the flash intensity of the stroboscope lamp 24 as well as the sensitivity and optical resolution of the camera 12 must be matched to one another in order to obtain sufficiently bright and sharp shadows or images of the grinding stock particles.
- the particle density can also be adjusted via the positioning of the funnel below the roller passage 6 and / or the size of the funnel opening.
- Adjustment of both particle density and particle velocity in the gap 10 may also be achieved by adjusting the gap distance, i. by adjusting the distance between the walls 20, 22.
- the inventive system thus offers a great freedom in the adjustment of the particle density and the particle velocity, the coarse adjustment mainly by the position of the hopper 8, by the wall distance in the gap 10 and by the amount of false air supply via the opening 38, while the fine adjustment mainly on the throttle valve 34 takes place in the branch line 32.
- additional fine cleaning of the walls by vibration, in particular by ultrasound can follow.
- the walls 20, 22 can be vibrated directly and / or indirectly via the air in the gap 10 (FIG. Structure-borne noise or airborne sound).
- a constant cleaning, or rather, a constant keeping clean of the wall surfaces is important so that in addition to the moving regrind particles in the form of still images not too many stationary Mahlgutpiety be detected by the camera.
- FIG. 2 is a block diagram of another part of the system according to the invention to illustrate its means for detecting and processing regrind information.
- the light source 24 is located to the right of the gap 10 and the camera 12 to the left thereof (projection version).
- the translucent walls 20, 22 are not shown here.
- the light source 24 is synchronized with the camera 12 via a timing generator 26, so that a stroboscope 24, 26 and a camera are obtained whose duty cycle is synchronous with the stroboscope.
- the camera 12 thus takes still images of the shadow of the Mahlgutpiety.
- the signal output of the camera 12 is connected to a computer 14, on which the image processing and the statistical evaluation of the grinding stock still images are performed (see Fig. 3).
- the timing generator or clock generator 26 the flash duration of the stroboscope lamp 24 and the switch-on duration of the camera 12 can be selected as desired (see FIG.
- Fig. 3 shows a part of the detection and processing of the regrind image information.
- the images captured in the camera 12 may be more or less perfect, ie sharp still images.
- the sharpness of a particle image or a particle shadow also depends on the particle velocity.
- no laminar flow is present and not necessarily intended (turbulence can act deagglomerating), have the different Mahlgutpiety in the presentation section or in the field of view of the camera 12 sometimes quite different speeds. So it may happen that some of the particle images are sharp and others are blurred or smeared in the direction of particle velocity.
- a particularly small depth of focus of about 0.2 to 2 mm.
- the thus obtained raw images of the image sensor of the camera 12 can be further processed.
- the raw images of the camera are digitally processed (pixel filter) for this purpose. Initially, an inhomogeneous illumination or brightness in the particle images and in the image background or in the particle shadow is corrected. Subsequently, sharp particles or particle images are selected, which are then fed to the further evaluation. In general, one can assume that this selection is representative of the totality of all particle images. If this is not the case, it is possible to work with several cameras 12 in different subareas of the gap 10 and to average the raw images or the sharp particle images or particle shadows selected from them.
- the particles or the particle images or the particle shadows are measured and a volume approximation performed.
- a typical cereal ground product eg wheat, barley, rye
- the maximum dimension Dmax of a regrind particle and the minimum dimension Dmin of a millbase particle barely exceed by more than differ a factor of two, ie Dmax ⁇ 2 Dmin.
- the mean particle sizes m or volume approximations V thus obtained from the processed particle images or particle shadows are then statically evaluated and displayed in a histogram.
- Fig. 4 shows a specific aspect of the detection and processing of optical millbase information.
- the vertical axis shows the flash intensity L.
- the horizontal axis shows the time t.
- the temporal flash pattern shows a short, intense still-image strobe flash and a slightly later trajectory strobe flash. Since the time interval between two consecutive still-image strobe flashes is more than can be one hundred times or even more than one thousand times the duty cycle of a stroboscopic flash, the time axis is shown interrupted.
- the detection of the particle images or particle shadow can be done by means of a series of stroboscopic bihlets having a first sub-series of still-stroboscopic flashes with a first duty T1 and a first light intensity L1 and a second sub-series of trajectory strobe flashes with a second duty T2 > 2 T1 and a second light intensity L2 ⁇ L1.
- the switch-off duration T3 between the still-picture stroboscopic flash and the trajectory stroboscopic flash fulfills the relationship 2 D ⁇ v T3 ⁇ 10 D and in particular the relationship 2 D ⁇ v T3 ⁇ 7 D.
- the switch-on duration T1 of the still-picture strobe flashes should be the relationship v T1 "D and, in particular, the relationship v T1 ⁇ D / 10 fulfill.
- the duty cycle T2 of trajectory stroboscopic flashes should satisfy the relationship v T2> D and in particular the relationship v T2> 5 D.
- the light intensity L1 of the still-picture strobe flashes and the light intensity L2 of the runway strobe flashes are different from each other. This can also be used to distinguish the resulting still images and trajectory images.
- the particle still images, to which a particle trajectory can be assigned, can be stored in a first still image memory, so that the respective particle still image information is stored in a still image memory for each completed still image strobe flash and trajectory strobe flash.
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Immunology (AREA)
- Food Science & Technology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Dispersion Chemistry (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Crushing And Grinding (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
Description
Claims
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/630,629 US20070205312A1 (en) | 2004-06-25 | 2005-05-02 | System and Device for Characterizing Grinding Stock in a Cylinder Mill |
EP05732681A EP1759198A1 (de) | 2004-06-25 | 2005-05-02 | System und verfahren zur mahlgut-charakterisierung in einem walzenstuhl |
AU2005256224A AU2005256224A1 (en) | 2004-06-25 | 2005-05-02 | System and method for characterising grinding material in a roller mill |
CA002570732A CA2570732A1 (en) | 2004-06-25 | 2005-05-02 | System and method for characterising grinding material in a roller mill |
EA200700121A EA011313B1 (ru) | 2004-06-25 | 2005-05-02 | Система и способ определения степени помола продукта в вальцовом станке и вальцовый станок |
EA200702410A EA011849B1 (ru) | 2004-06-25 | 2005-07-21 | Система и способ определения характеристик потока частиц |
EP05759810A EP1877777A1 (de) | 2005-05-02 | 2005-07-21 | System und verfahren zur partikelstrom-charakterisierung |
US11/919,617 US20090206286A1 (en) | 2004-06-25 | 2005-07-21 | System and method for particle stream characterization |
PCT/CH2005/000429 WO2006116882A1 (de) | 2005-05-02 | 2005-07-21 | System und verfahren zur partikelstrom-charakterisierung |
CNA2005800496881A CN101171513A (zh) | 2005-05-02 | 2005-07-21 | 用于表明粒子流的特征的系统和方法 |
IL179562A IL179562A0 (en) | 2004-06-25 | 2006-11-23 | System and device for characterizing grinding stock in a cylinder mill |
IL187028A IL187028A0 (en) | 2005-05-02 | 2007-10-30 | System and method for characterisation of a particle flow |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004031052A DE102004031052A1 (de) | 2004-06-25 | 2004-06-25 | System und Verfahren zur Mahlgut-Charakterisierung in einem Walzenstuhl |
DE102004031052.1 | 2004-06-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006000112A1 true WO2006000112A1 (de) | 2006-01-05 |
Family
ID=34965050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH2005/000242 WO2006000112A1 (de) | 2004-06-25 | 2005-05-02 | System und verfahren zur mahlgut-charakterisierung in einem walzenstuhl |
Country Status (11)
Country | Link |
---|---|
US (1) | US20070205312A1 (de) |
EP (1) | EP1759198A1 (de) |
CN (1) | CN101027553A (de) |
AU (1) | AU2005256224A1 (de) |
CA (1) | CA2570732A1 (de) |
DE (1) | DE102004031052A1 (de) |
EA (1) | EA011313B1 (de) |
IL (1) | IL179562A0 (de) |
UA (1) | UA87316C2 (de) |
WO (1) | WO2006000112A1 (de) |
ZA (1) | ZA200700521B (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006116882A1 (de) * | 2005-05-02 | 2006-11-09 | Bühler AG | System und verfahren zur partikelstrom-charakterisierung |
EA011849B1 (ru) * | 2004-06-25 | 2009-06-30 | Бюлер Аг | Система и способ определения характеристик потока частиц |
WO2009138479A1 (de) | 2008-05-14 | 2009-11-19 | Bühler AG | System und verfahren zur mahlgut-charakterisierung in einer mahlanlage |
EP2322911A1 (de) | 2009-11-13 | 2011-05-18 | Bühler AG | Vorrichtung zum Bestimmen von Partikelgrössen |
WO2013035892A1 (en) | 2011-09-08 | 2013-03-14 | Otsuka Pharmaceutical Co., Ltd. | Piperazine- substituted benzothiophene derivatives as antipsychotic agents |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
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ITMI20061205A1 (it) * | 2006-06-22 | 2007-12-23 | Iride S R L | Sistema per il controllo di produzione di una cava e relativo metodo |
DE102009032404A1 (de) * | 2009-07-08 | 2011-01-13 | Claas Selbstfahrende Erntemaschinen Gmbh | Mähdrescher |
CA2835799A1 (en) * | 2011-05-12 | 2012-11-15 | Peter Braun | Device and method for comminuting particles in liquid material |
DE202014100974U1 (de) * | 2014-03-04 | 2015-06-08 | Retsch Technology Gmbh | Vorrichtung zur Bestimmung der Partikelgröße und/oder der Partikelform eines Partikelgemisches |
JP2016151893A (ja) * | 2015-02-17 | 2016-08-22 | 株式会社東芝 | 画像処理装置、物品処理装置、及び、画像処理方法 |
FI20155908A (fi) * | 2015-12-01 | 2017-06-02 | Outotec Finland Oy | Menetelmä ja järjestely jauhinpiirillä varustetun hienonnusprosessin ohjaamiseksi |
EP3465177A4 (de) * | 2016-05-30 | 2020-03-04 | Southern Innovation International Pty Ltd | Materialcharakterisierungssystem und -verfahren |
DE102019209514A1 (de) * | 2019-06-28 | 2020-12-31 | Thyssenkrupp Ag | Walzenmühle und Verfahren zum Betreiben einer Walzenmühle |
TWI788786B (zh) | 2021-02-20 | 2023-01-01 | 大象科技股份有限公司 | 光學檢測裝置及其檢測方法 |
CN114371030B (zh) * | 2021-03-25 | 2024-03-12 | 中冶长天国际工程有限责任公司 | 一种矿产冶金用粉末采样处理系统 |
US11275014B1 (en) | 2021-05-03 | 2022-03-15 | Roy Olson | Particle characteristic measurement apparatus |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3441856A1 (de) * | 1984-04-19 | 1985-10-24 | Gebrüder Bühler AG, Uzwil | Infrarot-messvorrichtung sowie verfahren fuer die kontinuierliche quantitative bestimmung einzelner bestandteile von mehl oder anderen nahrungsmittel-mahlguetern |
EP0433498A1 (de) * | 1989-12-13 | 1991-06-26 | Satake Engineering Co., Ltd. | Mahlvorrichtung und System dafür |
EP0487356A2 (de) * | 1990-11-22 | 1992-05-27 | Satake Corporation | Verfahren und Vorrichtung zur Analyse des Schleifgrades eines Granulats |
WO2001003841A1 (en) * | 1999-07-08 | 2001-01-18 | Imeco Automazioni S.R.L. | System and self-moving device for the control of milling processes |
US20020170367A1 (en) * | 2001-05-18 | 2002-11-21 | Lieber Kenneth John | Control feedback system and method for bulk material industrial processes using automated object or particle analysis |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH496239A (de) * | 1967-10-19 | 1970-09-15 | Mueszeripari Muevek Lab | Verfahren und Einrichtung zur Bestimmung der Mahleigenschaften von Konsumgetreide |
DE1816219C3 (de) * | 1968-12-20 | 1980-01-24 | J.P. Poellath Kg, 8729 Zeil | Verfahren zur Herstellung von Sandsteingranulat und Anlage zur Durchführung des Verfahrens |
US5104671A (en) * | 1990-07-24 | 1992-04-14 | Conagra, Inc. | Wheat milling process |
US5917927A (en) * | 1997-03-21 | 1999-06-29 | Satake Corporation | Grain inspection and analysis apparatus and method |
-
2004
- 2004-06-25 DE DE102004031052A patent/DE102004031052A1/de not_active Withdrawn
-
2005
- 2005-02-05 UA UAA200613641A patent/UA87316C2/ru unknown
- 2005-05-02 CA CA002570732A patent/CA2570732A1/en not_active Abandoned
- 2005-05-02 CN CNA2005800202229A patent/CN101027553A/zh active Pending
- 2005-05-02 US US11/630,629 patent/US20070205312A1/en not_active Abandoned
- 2005-05-02 EP EP05732681A patent/EP1759198A1/de not_active Withdrawn
- 2005-05-02 WO PCT/CH2005/000242 patent/WO2006000112A1/de active Application Filing
- 2005-05-02 EA EA200700121A patent/EA011313B1/ru not_active IP Right Cessation
- 2005-05-02 AU AU2005256224A patent/AU2005256224A1/en not_active Abandoned
-
2006
- 2006-11-23 IL IL179562A patent/IL179562A0/en unknown
-
2007
- 2007-01-18 ZA ZA200700521A patent/ZA200700521B/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3441856A1 (de) * | 1984-04-19 | 1985-10-24 | Gebrüder Bühler AG, Uzwil | Infrarot-messvorrichtung sowie verfahren fuer die kontinuierliche quantitative bestimmung einzelner bestandteile von mehl oder anderen nahrungsmittel-mahlguetern |
EP0433498A1 (de) * | 1989-12-13 | 1991-06-26 | Satake Engineering Co., Ltd. | Mahlvorrichtung und System dafür |
EP0487356A2 (de) * | 1990-11-22 | 1992-05-27 | Satake Corporation | Verfahren und Vorrichtung zur Analyse des Schleifgrades eines Granulats |
WO2001003841A1 (en) * | 1999-07-08 | 2001-01-18 | Imeco Automazioni S.R.L. | System and self-moving device for the control of milling processes |
US20020170367A1 (en) * | 2001-05-18 | 2002-11-21 | Lieber Kenneth John | Control feedback system and method for bulk material industrial processes using automated object or particle analysis |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EA011849B1 (ru) * | 2004-06-25 | 2009-06-30 | Бюлер Аг | Система и способ определения характеристик потока частиц |
WO2006116882A1 (de) * | 2005-05-02 | 2006-11-09 | Bühler AG | System und verfahren zur partikelstrom-charakterisierung |
WO2009138479A1 (de) | 2008-05-14 | 2009-11-19 | Bühler AG | System und verfahren zur mahlgut-charakterisierung in einer mahlanlage |
US8632025B2 (en) | 2008-05-14 | 2014-01-21 | Bühler AG | System and method for ground material characterization in a grinding system |
EP2322911A1 (de) | 2009-11-13 | 2011-05-18 | Bühler AG | Vorrichtung zum Bestimmen von Partikelgrössen |
WO2011058092A2 (de) | 2009-11-13 | 2011-05-19 | Bühler AG | Vorrichtung zum bestimmen von partikelgrössen |
WO2013035892A1 (en) | 2011-09-08 | 2013-03-14 | Otsuka Pharmaceutical Co., Ltd. | Piperazine- substituted benzothiophene derivatives as antipsychotic agents |
Also Published As
Publication number | Publication date |
---|---|
CA2570732A1 (en) | 2006-01-05 |
EP1759198A1 (de) | 2007-03-07 |
DE102004031052A1 (de) | 2006-01-12 |
UA87316C2 (ru) | 2009-07-10 |
EA011313B1 (ru) | 2009-02-27 |
EA200700121A1 (ru) | 2007-06-29 |
CN101027553A (zh) | 2007-08-29 |
ZA200700521B (en) | 2008-04-30 |
US20070205312A1 (en) | 2007-09-06 |
IL179562A0 (en) | 2007-05-15 |
AU2005256224A1 (en) | 2006-01-05 |
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