CN101171513A - System and method for characterisation of a particle flow - Google Patents
System and method for characterisation of a particle flow Download PDFInfo
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- CN101171513A CN101171513A CNA2005800496881A CN200580049688A CN101171513A CN 101171513 A CN101171513 A CN 101171513A CN A2005800496881 A CNA2005800496881 A CN A2005800496881A CN 200580049688 A CN200580049688 A CN 200580049688A CN 101171513 A CN101171513 A CN 101171513A
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- 238000000034 method Methods 0.000 title claims abstract description 44
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- 239000000463 material Substances 0.000 claims abstract description 93
- 238000003801 milling Methods 0.000 claims abstract description 79
- 238000004458 analytical method Methods 0.000 claims abstract description 4
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- 238000001514 detection method Methods 0.000 claims description 28
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- 238000012545 processing Methods 0.000 claims description 12
- 238000003384 imaging method Methods 0.000 claims description 5
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Classifications
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- 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
- G01N15/1468—Optical investigation techniques, e.g. flow cytometry with spatial resolution of the texture or inner structure of the particle
- G01N15/147—Optical investigation techniques, e.g. flow cytometry with spatial resolution of the texture or inner structure of the particle the analysis being performed on a sample stream
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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
- 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
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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
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members
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- 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
- G01N15/1429—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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0019—Means for transferring or separating particles prior to analysis, e.g. hoppers or particle conveyors
-
- 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
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Food Science & Technology (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Dispersion Chemistry (AREA)
- Hydrology & Water Resources (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
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Abstract
The invention relates to a system and method for characterisation of a particle flow, for example, for characterisation of material for milling, in particular for milled cereals, in a roller frame with a roller passage (6) formed by a pair of rollers (2, 4) whereby the system comprises a withdrawal means (8) after the roller passage (6) for removal of a milled material sample (1) from the milled material flow exiting the roller passage (6), a presentation section (10) for conveying and presenting the taken milled material sample (1), a recording means (12, 24) for recording the milled material sample (1) passing through the presentation section (10) and an analytical means for analysis of the recorded milled material sample (1).
Description
Technical field
The present invention relates to a kind of system and method in order to show the feature of particle flux, wherein detect shape, size or the motor behavior of each single particle at least.
Background technology
In particle flux, relate to flowing of a Powdered extremely granular loose unpacked material, particularly cereal, flour, sugar, pigment, chemical products, medicine, radiation dust, soot particle, organic toner powder etc.
Abrasive grains shape material for example wheat or when sugar crushed particles shape material between each roller at a pair of roller in a roll crushing support.Repeatedly led such passage for the flour that for example obtains a fineness of the determining material of generally must will milling, the while is in the meantime by pneumatic separating and sieving and grading.Can obtain for example to have the flour of different fineness or different degree of pulverizing like this.
The effect of milling of one passage depends primarily on the slit spacing between two rollers of a pair of roller.But the roll crushing support running parameter that also has other influences the effect of pulverizing of passage.Therefore what be worth expectation is, obtains the feature of the material of milling that flows out behind a passage of determining.Material then can be from this deviation enforcement slit spacing or the correction of another roll crushing support running parameter in case of necessity, so that eliminate this deviation as quickly as possible again to a deviation of specified feature of milling material if mill this moment.
Summary of the invention
The objective of the invention is to, a kind of system and method is provided, it can show particle flux in a roll crushing support, especially from a feature of milling the material of milling that flows out the passage.
Reach this purpose according to the described system of claim 1 with according to the described method of claim 33.
System of the present invention comprises that an extraction element is in order to take out a sample from particle flux; One display part is in order to carry and to show the sample of taking-up; One pick-up unit is in order to detect the sample of carrying by the display part; With the sample of an analytical equipment in order to analyzing and testing.
Method of the present invention has following steps: take out a sample from particle flux; In a display part, carry and show the sample of taking-up; The sample that detection is carried by the display part; Sample with analyzing and testing.
Can obtain particle flux in such a way, especially from a feature of milling the material of milling that flows out the passage.
Preferably in the downstream of extraction element with disaggregation part is set in upstream, display part or display part in order to decompose the particle material group in the sample.。Prevent that thus the material group that is made of many particles from being macroparticle by detection and Identification phonily.
Extraction element can be connected in the display part via a Pneumatic pipe, making can be by Pneumatic pipe and display part along the delivery pathways sample that flows, system of the present invention in such a way also can be installed in a position away from the roll crushing support in the factory that mills, increase the degree of freedom of creating when the design of a grinding equipment whereby.
Meet the display part, destination and have two opposed walls, between them, form a gap, wherein two plane surfaces that opposed wall preferably is arranged in parallel.
Meet the above-mentioned Pneumatic pipe in destination and feed in a port zone in the gap that forms between opposed each wall, wherein flow path preferably has direction variation in the port zone.Cause the collision of material on duct wall of milling going along with in the conveying gas of Pneumatic pipe thus, the disaggregation of this material that helps to exist group.The direction of flow path changes especially between 30 ° and 90 ° and preferably between 80 ° and 90 °.Thereby this is causing king-sized momentum to change when it turns to collision and is causing a significant especially impact effect on the particle going along with.
Meet the destination pick-up unit and have a video camera in order to detect electromagnetic radiation or electromagnetic frequency, particularly light frequency, wherein video camera preferably points to the gap or to gap alignment.
According to first scheme, opposed each wall of display part can see through electromagnetic radiation, the particularly light frequency that can be detected by video camera.Therefore video camera can be arranged on the back of a wall by the either side that is chosen in the gap.
First be provided with at this, video camera is arranged on one of them of two transmissible walls in a side in gap in the downstream, gap, and one is used for the energy of electromagnetic radiation, particularly light source, for the electromagnetic radiation that can detect by video camera, at the opposite side in gap on the downstream, gap is arranged on another of two transmissible walls, thereby the ken that the particle of the sample of carrying by the gap enters video camera by the shade or the projection of the particle of electromagnetic radiation irradiation and sample.
According to alternative plan, first wall can see through electromagnetic radiation, the particularly light frequency that can be detected by video camera in two opposed walls of display part, and second wall can not see through electromagnetic frequency, the particularly light frequency that can be detected by video camera and be than the particle of sample extinction more strongly.
Second be provided with at this, video camera is arranged on the transmissible wall in the downstream, gap in a side in gap, and one is used for the energy of electromagnetic radiation, particularly light source, for the electromagnetic radiation that can detect by video camera, the same side in the gap is arranged on the transmissible wall in the downstream, gap, thus the scattered light of the particle of the particle of the sample that irradiation is carried by the gap and sample or the ken that reflection enters video camera.
At this advantageously, the surface of the surface ratio particle of the clearance side of second wall has stronger absorption to the electromagnetic radiation by energy emission.Guarantee between the particle of the surperficial reflection of moving previously of clearance side and light, to have abundant contrast thus by the wall reflection, thus can be embodied as easily picture particle detection and be convenient to Flame Image Process then significantly.This saves expensive and time taking filter process when Flame Image Process.
In favourable further developing, be respectively two opposed walls and dispose a purification plant, two opposed walls of purification plant can be removed the particle that adheres to thereon whereby.This guarantees, no too much static that is particle imaging in video camera that adhere on or another wall.Particle size distribution at the particle that adheres on the wall generally is different from particle going along with in particle flux.If in the detection of particle flux image information and processing procedure, can eliminate the difference between the particle static and motion, then therefore should regularly implement such wall and purify, so that the particle that " shaking off " adheres on each wall.
Purification plant is a vibration source, particularly ultrasound source, and it is rigidly connected with two opposed walls respectively, so that can make two walls be in vibration." the solid-borne sound transmission scheme " that also this scheme is called purification plant.
Perhaps, purification plant is a vibration source, particularly ultrasound source, and purification plant can make the medium of gaseous state vibrate between two opposed walls whereby." the airborne sound scheme " that also this scheme is called purification plant.
The disaggregation part is the impact surfaces in the entrance area of display part preferably.Except that by collision with to the disaggregation that the momentum of material group transmits, the airborne sound scheme of wall purification plant also can help the disaggregation of particle going along with in the air, wherein in case of necessity successively or simultaneously with different ultrasonic frequency work.
The direction variation of flow path preferably is in the entrance area of display part.Therefore not far realization collision before the light of particle flux detects, thus particle is actually complete disaggregation.
Also must mention in this respect, also particularly advantageously be, a plurality of holes are not set in Pneumatic pipe before the display part in the upstream, outside air (" mixing gas ") be sucked in the Pneumatic pipe with little negative pressure work via them.The gas that mixes that this sneaks into with pulsing in case of necessity also helps wall to purify and disaggregation.
Meet display part, destination or " window " ken greater than video camera, this moment, video camera then only detected the part zone of display part.This can be positioned at video camera on the position on wall or the window in the viewing area, be expected at the particle segregation of the minimum in the particle flux in this position.
When display part or window also can a plurality of video cameras during greater than the ken of video camera detect the part zone of display part respectively.In the display part, can obtain the mean value of the different particle flux image of diverse location thus.If the segregation of particle flux takes place in different subregions, then can realize that one proofreaies and correct by this mean value, can compensate such segregation at least in part whereby, thereby average the overall of information is representational for the particle size distribution in all particles stream from each corresponding particle flux image.
In a special form of implementation, can control a plurality of video cameras by selection respectively, thereby can use the part of the selection of the particle flux image on imageing sensor also can average.
Perhaps the display part can meet the full ken of video camera basically, and this moment, the imageing sensor of video camera then was controllable by selecting, thereby can use the part of the selection of the particle flux image on imageing sensor.The preferred pure control that realizes such selection randomly, and special in control by means of random generator.
Be that a roll crushing support disposes system of the present invention and comprises that in roller passage back a plurality of extraction elements that are provided with along the axial direction of a roller passage, wherein preferred first extraction element are arranged in the zone of first axial end of roller passage and second extraction element is arranged in the zone of second axial end of roller passage in a favourable further exploitation.Can obtain thus as information along the degree of pulverizing of the function of the axial location of a pair of roller.Along a pair of roller or especially under the situation of the uneven material characteristics of milling between the left part of roller passage and the right part, can infer a pair of roller each roller positioning error and proofread and correct.
Meet destination light source and video camera and be connected in a control device, this control device can synchronously connect and cut out light source and video camera, thereby realizes the sequence that a stroboscope is taken.Also a plurality of light sources or stroboscope-flash unit can be set, can be simultaneously but differently operate them, and especially aspect flash duration and flash intensity.
Analytical equipment preferably has image processing system.
This image processing system has device and is used for distinguishing particle that moves and the particle that sticks on the wall by video camera with projection pattern or with reflection mode particle imaging and detection.Can not consider to stick to the static particle on the wall then in the evaluation when Flame Image Process, thereby only the particle that moves is used for estimating.Be similar to the above thus, avoid the particle size distribution of the particle flux of falseness.
Preferably from the streams of milling of leaving the roller passage, take out the material sample of milling when on a roll crushing support, implementing method of the present invention in different positions, thereby as previously discussed, can obtain information about the relative roller location of a pair of roller of passage.
The preferred then material sample of milling of in a Radial Flow, carrying such acquisition by the display part.Radially flow velocity from inside to outside reduces in radial direction in such Radial Flow.The loading of conveyance fluid (for example pneumatic gas) radially from inside to outside is constant to a considerable extent, that is the quantity of the material particle of milling of per unit volume also is constant over there to the outside basically, thus the probability that particle piles up in the image of perspective view or reflectogram radially the zone be constant basically.So the logistics of milling that moves radially on the one hand a fully dense loading that can be by video camera when the radial location of a subregion of detecting is so that obtain a representational image, with on the other hand one fully the logistics of milling of dilution so that in video camera, keep particle picture the least possible overlapping (not having " the material group of vision "), between make a best balance.
By gas can change conveyance fluid in the part that is arranged in inner radial of surveyed area the loading that mixes that can flow into.
Definitely reasonably be the operation time when saving Flame Image Process, only detects the particle flux that flows through the display part in the subregion.Advantageously conversion is once at least in the process of the whole detection between the zone of another part at least of the detection of and then carrying out another part in the first zone of the detection of at first carrying out first.The average evaluation result of the subregion of different detections then is so that obtain the representational as far as possible feature of whole particle flux.The preferred subregion of selecting each detection of display part randomly.
As previously discussed, particularly advantageous is to realize the disaggregation that continues of the particle material group in the particle flux before carrying particle flux by the display part and/or in the process.On the one hand can be before particle flux flows through the display part to this mainly by turning to and collide the realization disaggregation.Flow through in the process of display part and can mainly realize disaggregation at particle flux on the other hand by the turbulent flow in the pneumatic particle flux.
Meet the destination,, pneumatically carry the sample that takes out, wherein preferably realize extraction, demonstration, detection and the analysis of sample continuously from taking out up to demonstration.Therefore by showing the particle flux feature that produces by mill processes, obtain perfection monitoring to for example mill processes and the material of milling.This can be used for mill processes in particularly advantageous mode, especially for the calibration in the slit of milling.
Meet the destination and realize the detection of continuous particle samples stream by a series of stroboscope flashes of light in the flash of light mode.
Below adopt following abbreviation:
The mean flow rate of the medium that V=is pneumatic;
The particle size that D=is average or the average particle size of particle;
D
MinThe smallest particles size of=one particle;
D
MaxThe maximum particle size of=one particle;
Preferred detection realizes by means of a series of stroboscope flashes of light, it has first fen series that is made of the rest image stroboscope flash of light that comprises the first on-time T1 and the first light intensity L1 and the second fen series that is made of the flight path stroboscope flash of light that comprises the second on-time T2 and the second light intensity L2, satisfies following relationship: T2 〉=2T1 simultaneously.
General people mill material for one can be from D
Max≤ 2D
MinSet out.If the on-time T2 of flight path stroboscope flash of light is the twice approximately at least of the on-time T1 of rest image stroboscope flash of light, then the flight path stroboscope flash of light figure of particle is different from rest image flash of light figure, wherein a D of the particle of a superfine length all the time
Max=2D
MinCan prevent with this, such image of a short as far as possible flight path when estimating and the image of a static elongated particle obscure.
Preferably between rest image stroboscope flash of light and flight path stroboscope flash of light, close the duration T 3 satisfied 2D＜VT3 that concern.
Guarantee that whereby the image of the material particle of milling is not because two in succession rest image stroboscope flashes of light mutually can be overlapping.This is favourable in the charge-coupled device (CCD) (CCD) for example in quite a lot of imageing sensors.
Preferably the duration T 3 of closing between rest image stroboscope flash of light and the flash of light of flight path stroboscope satisfies and concern the also satisfied especially 2D＜VT3＜7D that concern of 2D＜VT3＜10D.
The result of this generation is, for once as rest image with once as the particle of the motion of flight path imaging, not excessive at corresponding rest image with the spacing between the corresponding flight path, thus the clear and definite configuration between the corresponding rest image of the particle that moves and affiliated corresponding flight path is possible.
For the particle that obtains to move fully clearly that is almost " do not have fuzzy " or " nothing is defiled " rest image, the on-time T1 of rest image flashlamp flash of light should satisfy concern VT1＜＜D and the satisfied especially VT1＜D/10 that concerns.
In order to obtain clearly flight path image, it can not obscured with the rest image of the particle of superfine length, and the duration of contact T2 of flight path stroboscope flash of light should satisfy VT2＞D and satisfy VT2 〉=5D especially.
With above-mentioned each feature irrespectively advantageously, the light intensity L1 of rest image stroboscope flash of light is different with the light intensity L2 of flight path stroboscope flash of light each other.This can be used to distinguish consequent rest image and flight path image equally.
The particle rest image, can be it and dispose a particle flight path, can be stored in first still video memory, thereby each the rest image stroboscope of finishing flash of light and the flash of light of flight path stroboscope are deposited in corresponding particle information for still picture in one still video memory.
Can estimate the particle information for still picture of rest image in succession in this case, so that particularly determine the distribution of average particle size D, its standard deviation and its statistics with adding up.Can describe by means of distribution function (differential) or by means of histogram (integration).
System of the present invention can be as the system of the feature that shows the material of milling.Its preferably one mill use in the factory and there configuration always give a roll crushing support so that show the feature of the material of milling accordingly (for example flour, sugar, pigment etc.).
Meet the destination and also be this roll crushing support configuration:
One comparison means is used for the mill comparison of the specified feature of material of a material characteristics and of milling that detects; With
One adjusting gear is used for calibrating the slit spacing or calibrating another roll crushing support running parameter in case of necessity according to the deviation of milling between material characteristics and the specified feature of the material of milling that detects.
The control and the adjustment in the roller slit of the roll crushing support in this factory that can realize particularly milling.
Description of drawings
Draw other advantage, feature and application possibility of the present invention by following description now, and be not limited to these forms of implementation by accompanying drawing, wherein:
The schematic sectional view of the part of Fig. 1 one system of the present invention, the process of logistics so that explanation is milled;
The block scheme of another part of Fig. 2 system of the present invention is used to detect and handle the device of material information of milling so that it is described;
Fig. 3 illustrates the part of the detection and the processing of the material information of milling; And
Fig. 4 illustrates a special aspect of the detection of the material information of milling and processing.
Embodiment
Fig. 1 illustrates the schematic sectional view of the part of a system of the present invention, the process of logistics so that explanation is milled.A pair of roller 2,4 constitutes the passage 6 of milling of a roll crushing support.With the material 1 of milling that stain schematically illustrates, it for example relates to the wheat flour with the particle size in the hundreds of mu m range, enters a funnel 8 after grinding in it is milling passage 6, and this funnel feeds in the Pneumatic pipe 18.Carry to a gap 10 via this Pneumatic pipe 18 material 1 of will milling, extend between the first wall 20 and second wall 22 in this gap, their location that is parallel to each other.The material 1 of milling flows in the gap 10 in port zone 19 and also then radially outward moves from this port zone 19, so that enter a transitional region 28, pneumatically and by gravity carries and enter another Pneumatic pipe 30 downwards by this zone material of will milling.
(projection scheme) is provided with a video camera 12 above the wall 20 of printing opacity in first scheme, and it points to gap 10.Be provided with a light source 24 below the wall 22 of printing opacity, it is by two walls, 20,22 irradiation gaps 10.Video camera 12 detects the shade that is throwed by the material particle 1 of milling on its imageing sensor.
(reflection scheme, not shown) light source 24 is by the next door of selecting to be arranged on video camera 12 above the wall 20 of printing opacity in alternative plan.Lower wall 22 is surfaces lighttight and have a dark on the side in gap 10 in this case.Video camera 12 detects by material particle 1 light that reflect or scattering on its imageing sensor of milling.
In port zone 19, be provided with the disaggregation part 16 of an impingement plate form.Via Pneumatic pipe 18 send here mill this impingement plate 16 of material particle 1 bump and then before it enters gap 10 between two parallel walls 20,22 by carrying air to experience about 90 ° turning to.Decompose the material group in the material particle of milling whereby effectively, and the material particle of milling of disaggregation enters in the gap 10.Therefore prevent because material group causes the false material characteristics of milling in the material of milling.
Also be provided with a hole 38 in port zone 19, it circularizes extension around Pneumatic pipe 18.Enter the gap by these hole 38 outside airs or " mixing gas ", because with small negative-pressure operation Pneumatic pipe 18,28 and 30.Mixing the gas that mixes that pore 38 enters by this purifies the inner face of wall 20,22 and prevents the obstruction in gap 10 thus.
Pneumatic pipe 30 feeds the pipeline (not shown) that leaves the roll crushing support again.Therefore the material sample 1 of milling that takes out is defeated by attrition mill again via a suction manifold (not shown), so as to continue in case of necessity to grind, screening or pneumatic separating.This returns the round-robin of milling " sucking-off " and schematically represents by a suction cleaner 36 among Fig. 1.
Also be provided with an arm 32 in Pneumatic pipe 30, it constitutes the bypass line of suction cleaner 36.This arm 32 comprises a throttling valve 34, borrows the resistance to flow of its scalable arm 32.Thereby therefore can adjust total resistance to flow of the parallel line that constitutes by suction cleaner 36 and arm 32 and the flow velocity in the adjustment Pneumatic pipe 18,28 and 30.In other words can change the pumping power of attrition mill (or " suction cleaner " 36) by the throttling valve of arm 32.The fine tuning of pumping power is possible whereby.
For the best operation of system of the present invention so that show the feature of the material of milling, milling material density on the one hand should be not excessive.The sensitivity of the flash duration of material speed, flashlamp 24 of milling on the other hand and flash intensity and video camera 12 and light resolution is coupling mutually, so that obtain the fully bright of the material particle of milling and shade or image clearly.
Radially from inside to outside flow in the gap 10 of material between plate 20,22 owing to mill, so mill material density and radially radially reduction from inside to outside of flow velocity.Therefore people can adopt a best particle density and particle flow velocity in order to detect and analysis image information under the flow condition in predetermined Pneumatic pipe 18,28,32 above the wall 20 of radial direction at printing opacity by camera position and lamp position.
With camera position and lamp location independent radially, also can be via the location and/or the lural adjusted size particle density of funnel below roller passage 6.
The adjustment of particle density in the gap 10 and particle flow velocity also can be by the adjustment of gap clearance, that is realizes by the adjustment of the spacing between the wall 20,20.
Therefore system of the present invention has a big degree of freedom when the adjustment of particle density and particle flow velocity, its coarse adjustment mainly by the position of funnel 8, in the gap 10 the wall spacing and realize that via the gas quantity delivered that mixes in hole 38 and fine tuning mainly realizes via the throttling valve in the arm 32 34.
Except that supplying with the thick purification of the wall of realizing 20,22 by mixing gas, can also be by vibrating, particularly realizing that by ultrasound wave the additional essence of each wall purifies, can directly and/or indirectly make wall 20,22 vibrate (solid-borne sound transmission or airborne sound) via the air in the gap 10 this moment.One purification that continues, or lasting keeping clean is important or rather, so that the no too much static material particle of milling is detected by video camera except that the form of material particle with rest image of milling of motion.This may cause the feature of the false material of milling on the one hand, because stick to the particle size distribution that the Size Distribution of the particle on the wall generally may be different from the material of milling of conveying.Thereby the too much on the other hand material particle of milling that sticks on each wall causes the very high particle density in the ken of video camera and the shade of the material particle that causes milling or image numerous overlapping.
Fig. 2 is the block scheme of another part of system of the present invention, is used to detect and handle the device of material information of milling so that it is described.Light source 24 is positioned at the right in gap 10, and video camera 12 is in its left side (projection scheme).Wall 20,22 (see figure 1)s of not shown printing opacity here.Light source 24 and video camera 12 be via a time matched generator 26 synchronised, thereby obtain a stroboscope 24,26 and a video camera, and the on-time of this video camera and stroboscope are synchronous.Therefore video camera 12 takes the rest image of the shade of the material particle of milling.The signal output part of video camera 12 is connected in a computing machine 14, the Flame Image Process and the statistical study (referring to Fig. 3) of the material rest image of realizing thereon milling.Can select the flash duration of flashlamp 24 and the on-time (referring to Fig. 4) of video camera 12 arbitrarily by means of time matched generator or beat generator 26.
Fig. 3 illustrates the part of the detection and the processing of the material image information of milling.The image that detects in the video camera 12 may more or less be perfect, that is is rest image clearly.After the particle of video camera in gap 10 focuses on, the clear particle flow velocity that yet depends on of particle picture or particle shade.Because (turbulent flow can play disaggregation) that does not generally have laminar flow and also not necessarily expect in the gap 10, the different material particles of milling have significantly different speed sometimes in the display part or in the ken of video camera 12.May take place like this, quite a lot of particle pictures be clearly and other be blur or defile along the direction of particle flow velocity.
In order to detect the irradiation as far as possible uniformly that at first must in the ken of video camera 12, cause the gap.This is important for the reflection scheme especially, because otherwise may cause by the small contrast between the light of particle reflection and the light that is reflected by lighttight wall 22 (not shown).
Except that shining as far as possible uniformly with same described to the focusing of aiming at as far as possible in gap of described gap 10, be further noted that a sufficient depth of field, even so that when bigger gap clearance greater than a centimetre, also can on whole gap width, realize an abundant distinct image.
Also can advantageously adjust an especially little about depth of field of 0.2 to 2mm.Whereby in order to estimate a part of zone (plane of distinct image) of only detecting surveyed area, in this zone in fluid stream particle going along with.The sum of the particle that moves can be reduced to a static important quantity by such " light leaches " in surveyed area.This for example is important, so that get rid of the overlapping of particle picture or echo to a considerable extent.
When taking all these measures and be when optimizing, still can further handle the original image of imageing sensor of the video camera 12 of such acquisition.
As shown in Figure 3, for this reason the original image of video camera through digital processing (pixel filtrator).This is at first proofreaied and correct in the particle picture and image background in or uneven irradiation or brightness in the particle shade.
And then select particle or particle picture clearly, it supplies with further evaluation then.Generally can set out thus, i.e. this selection totally is representational for all particles image.If it is not this situation, then can utilizes a plurality of video cameras in the different portion subregion in gap 10, to work and get original image or by the particle picture clearly of its selection or the mean value of particle shade.
Measure particle or particle picture or particle shade then and get the volume approximate value.This is generally set out thus, i.e. the mill dimension D of maximum of material particle of (for example wheat, barley, rye) in a typical grain milling product
MaxWith a dimension D of minimum of milling the material particle
MinDifference hardly greater than 2 times, that is D
Max≤ 2D
MinFor example can use the minimum dimension a and the full-size b of a particle picture or a particle shade and determine mean value M=(a+b)/2 thus, it multiply by a geometric factor or a form factor k who is suitable for the general material shape of particle of milling again, thereby as the volume approximate value obtain the V=function (a, b)=km
3=k[(a+b)/2]
3Perhaps volume also can pass through function V=ka
2B is similar to.Because particle to be tested has the shape of a flat under current situation, also might replace volume, that is the 3rd size (thickness) is constant and includes in together among the geometric constant k by the projected area of particle.
Statistics ground is estimated so average particle size m or the volume approximate value V that is obtained by particle picture of handling or particle shade and is described in a histogram then.
Fig. 4 illustrates mill a special aspect of the detection of material information and processing of light.Z-axis illustrates flash intensity L.Transverse axis illustrates time t.Flash of light in time distributes, and demonstration one strong rest image stroboscope in short-term glistens and a flight path stroboscope flash of light of finishing after a while.Since the time interval between two in succession the rest image stroboscope flashes of light can greater than hundred times of on-time of stroboscope flash of light or even thousand times, so time shaft is shown discontinuously.
Can realize the detection of particle picture or particle shade by means of a series of stroboscope flash of light, it has first fen series that is made of the rest image stroboscope flash of light that comprises the first on-time T1 and the first light intensity L1 and the second fen series that is made of the flight path stroboscope flash of light that comprises second on-time T2 〉=2T1 and second light intensity L2＜L1.
The duration T 3 of closing between rest image stroboscope flash of light and the flash of light of flight path stroboscope satisfies and concern the also satisfied especially 2D＜VT3＜7D that concern of 2D＜VT3＜10D.
For fully clearly that is obtain " not having fuzzy " or " nothing is defiled " rest image of the material particle of milling of in fact motion, the on-time T1 of rest image stroboscope flash of light should satisfy concern VT1＜＜D and the satisfied especially VT1＜D/10 that concerns.
In order to obtain clear and definite flight path image, it can not obscured with the rest image of the superfine material particle of milling, and the on-time T2 of flight path stroboscope flash of light should satisfy and concern VT2＞D and the satisfied especially VT2 〉=5D that concerns.
Irrelevant advantageously with each above-mentioned feature, the light intensity L1 of rest image stroboscope flash of light is different with the light intensity L2 of flight path stroboscope flash of light each other.This can be used for the differentiation of consequent rest image and flight path image equally.
The particle rest image, can be it and dispose a particle flight path, can be stored in first still video memory, thereby each the rest image stroboscope of finishing flash of light and the flash of light of flight path stroboscope are deposited in corresponding particle information for still picture in one still video memory.
List of numerals
The 1 material sample/particle information of milling
2 rollers
4 rollers
6 roller passages
8 extraction elements, funnel
10 display parts, the gap
The pick-up unit of 12 electromagnetic radiation, video camera
14 analytical equipments, image processing system
16 disaggregation parts, impact surfaces
18 Pneumatic pipes
19 port zones
20 first walls
22 second walls
The energy of 24 electromagnetic radiation, light source
26 control device, the time matched generator
28 transitional regions
30 Pneumatic pipes
32 bypass lines, arm
34 throttling valve
36 suction manifolds, suction cleaner (returning attrition mill)
38 mix pore
L1 first light intensity
L2 second light intensity
First on-time of T1
Second on-time of T2
T3 closes the duration
The particle size of the material particle of milling that D is average
D
MinThe mill smallest particles size of material particle
D
MaxThe mill maximum particle size of material particle
Claims (51)
1. be used to show the system of feature of the particle of particle flux, this system has:
One extraction element (8) is in order to take out a sample (1) from particle flux;
One display part (10) is in order to carry and to show the sample (1) of taking-up;
One pick-up unit (12,24) is in order to detect the sample of carrying by display part (10) (1); With
One analytical equipment (14) is in order to the sample (1) of analyzing and testing.
2. according to the described system of claim 1, it is characterized in that, in the downstream of extraction element (8) with disaggregation part (16) is set in (10) upstream, display part or display part in order to decompose the particle material group in the sample (1).
3. according to claim 1 or 2 described systems, it is characterized in that extraction element (8) is connected in display part (10) via a Pneumatic pipe (18), make sample (1) can pass through Pneumatic pipe (18) and display part (10) along the delivery pathways that flows.
4. according to one of claim 1 to 3 described system, it is characterized in that display part (10) have two opposed walls (20,22), between them, form a gap.
5. according to the described system of claim 4, it is characterized in that two opposed walls (20,22) have the plane surface that is arranged in parallel.
6. according to claim 4 or 5 described systems, it is characterized in that Pneumatic pipe (18) feeds in the gap (10) that forms between opposed each wall (20,22) in a port zone (19).
7. according to the described system of claim 6, it is characterized in that flow path has direction variation in port zone (19).
8. according to the described system of claim 7, it is characterized in that described direction changes between 30 ° and 90 °.
9. according to the described system of claim 8, it is characterized in that described direction changes between 80 ° and 90 °.
10. according to one of claim 1 to 9 described system, it is characterized in that pick-up unit has a video camera (12) in order to detect electromagnetic radiation or electromagnetic frequency, particularly light frequency.
11., it is characterized in that video camera (12) points to gap (10) according to the described system of claim 10.
12., it is characterized in that opposed each wall (20,22) of display part (10) can see through can be by electromagnetic radiation, the particularly light frequency of video camera (12) detection according to claim 10 or 11 described systems.
13. according to the described system of claim 12, it is characterized in that, video camera (12) is arranged on one of them (20) of two transmissible walls in a side of gap (10) in the downstream, gap, and one is used for the energy (24) of electromagnetic radiation, light source particularly, for the electromagnetic radiation that can detect by video camera (12), opposite side in gap (10) is arranged on another (22) of two transmissible walls in the downstream, gap, thereby the particle of the sample of carrying by gap (10) (1) is by the shade of the particle of electromagnetic radiation irradiation and sample (1) or the ken that projection enters video camera (12).
14. according to claim 10 or 11 described systems, it is characterized in that, first wall (20) can see through electromagnetic radiation, the particularly light frequency that can be detected by video camera (12) in two opposed walls (20,22) of display part (10), and second wall (22) can not see through electromagnetic frequency, the particularly light frequency that can be detected by video camera (12) and be than the particle of sample extinction more strongly.
15. according to the described system of claim 14, it is characterized in that, video camera (12) is arranged on the transmissible wall (20) in the downstream, gap in a side of gap (10), and one is used for the energy (24), the particularly light source of electromagnetic radiation, for the electromagnetic radiation that can detect by video camera (12), the same side in gap (10) is arranged on the transmissible wall (20) in the downstream, gap, thus the particle of sample (1) and the scattered light of the particle of sample (1) or the ken that reflection enter video camera (12) of irradiation by gap (10) conveying.
16., it is characterized in that the surface of the surface ratio particle of the clearance side of second wall (22) has stronger absorption to the electromagnetic radiation by the energy (24) emission according to the described system of claim 15.
17., it is characterized in that according to one of claim 12 to 16 described system, be that two opposed walls (20,22) dispose a purification plant respectively, two opposed walls of purification plant can be removed the particle that adheres to thereon whereby.
18., it is characterized in that purification plant is a vibration source, particularly ultrasound source according to the described system of claim 17, it is rigidly connected with two opposed walls respectively, so that can make two walls (20,22) be in vibration.
19., it is characterized in that purification plant is a vibration source, particularly ultrasound source according to the described system of claim 17, purification plant can make the medium of gaseous state vibrate between two opposed walls (20,22) whereby.
20., it is characterized in that disaggregation part (16) is a impact surfaces in the entrance area of display part (10) according to the described system of claim 2 to 19.
21., it is characterized in that the direction variation of flow path is in the entrance area of display part (10) according to the described system of claim 20.
22., it is characterized in that display part (10) only detect a part of regional of display part greater than the ken and the video camera of video camera (12) according to one of claim 3 to 21 described system.
23., it is characterized in that display part (10) detect a part of regional of display part respectively greater than the ken and a plurality of video camera of video camera (12) according to one of claim 3 to 21 described system.
24., it is characterized in that a plurality of video cameras can be controlled respectively by selection according to the described system of claim 23, thereby can use the part of the selection of the particle flux image on camera image sensor.
25. according to one of claim 3 to 21 described system, it is characterized in that, display part (10) corresponds essentially to the ken of video camera (12) and the imageing sensor of video camera can be controlled by selection, thereby can use the part of the selection of the particle flux image on camera image sensor.
26., it is characterized in that the control of selection can be randomly, realize via random generator control ground especially according to claim 24 or 25 described systems.
27. according to one of claim 20 to 26 described system, it is characterized in that, light source (24) and video camera (12) are connected in a control device (26), and this control device can synchronously connect and cut out light source (24) and video camera (12), thereby realize the sequence that a stroboscope is taken.
28., it is characterized in that analytical equipment (14) has an image processing system according to one of claim 20 to 27 described system.
29. according to the described system of claim 28, it is characterized in that image processing system has device and is used for distinguishing particle that moves and the particle that sticks on the wall (20,22) by video camera with projection pattern or with reflection mode particle imaging and detection.
30. according to one of claim 1 to 26 described system, it is characterized in that, this system is used for showing the feature of a particle flux that flows out from a roll crushing support, wherein extraction element (8) is arranged on the back of the roller passage (6) that constitutes by a pair of roller (2,4), and wherein particle flux is that mill streams and sample is the material sample of milling.
31., it is characterized in that this system has a plurality of extraction elements (8) that are provided with along the axial direction that grinds axis channel (6) in the back of roller passage according to the described system of claim 30.
32., it is characterized in that this system has first extraction element and have second extraction element in the zone of second axial end of roller passage (6) according to the described system of claim 31 in the zone of first axial end of roller passage (6).
33. be used to show the method for feature of the particle of a particle flux, particularly, comprise the following steps: using under the situation according to one of claim 1 to 32 described system
From particle flux, take out a sample;
In a display part, carry and show the sample of taking-up;
The sample that detection is carried by the display part; With
The sample of analyzing and testing.
34. according to the described method of claim 33, it is characterized in that, in a Radial Flow, carry sample by the display part.
35. according to claim 33 or 34 described methods, it is characterized in that, only in the subregion, detect the material sample of milling that flows through the display part.
36., it is characterized in that conversion is once at least in the process of the whole detection between the zone of another part at least of the detection of and then carrying out another part in the first zone of the detection of at first carrying out first according to the described method of claim 35.
37. according to claim 35 or 36 described methods, it is characterized in that, select the subregion of each detection of display part randomly.
38. according to one of claim 33 to 37 described method, it is characterized in that, before carrying sample and/or in the process, realize the disaggregation of the particle material group in the sample by the display part.
39. according to the described method of claim 38, it is characterized in that, before sample flow is crossed the display part mainly by turning to and collide the realization disaggregation.
40. according to the described method of claim 38, it is characterized in that, cross in the process of display part main by the realization of the turbulent flow in pneumatic particle flux disaggregation in sample flow.
41. according to one of claim 35 to 40 described method, it is characterized in that,, pneumatically carry the sample that takes out from taking out up to demonstration.
42. according to one of claim 35 to 41 described method, it is characterized in that, realize extraction, demonstration, detection and the analysis of sample continuously.
43. according to the described method of claim 42, it is characterized in that, realize the detection of continuous particle samples stream by a series of stroboscope flashes of light in the flash of light mode.
44. according to the described method of claim 43, it is characterized in that, detection realizes by means of a series of stroboscope flashes of light, it has first fen series that is made of the rest image stroboscope flash of light that comprises the first on-time T1 and the first light intensity L1 and the second fen series that is made of the flight path stroboscope flash of light that comprises the second on-time T2 and the second light intensity L2, satisfies following relationship: T2 〉=2T1 simultaneously.
45., it is characterized in that the light intensity L1 of rest image stroboscope flash of light is different with the light intensity L2 of flight path stroboscope flash of light each other according to the described method of claim 44.
46. according to claim 44 or 45 described methods, it is characterized in that, the particle rest image of a configurable particle flight path is stored in first still video memory, thereby flash of light of rest image stroboscope and the flash of light of at every turn finishing of flight path stroboscope deposited in the particle information for still picture in one still video memory.
47., it is characterized in that the particle information for still picture of rest image is in succession estimated on statistics ground according to the described method of claim 46, so that particularly determine the distribution of average particle size D, its standard deviation and its statistics.
48. according to one of claim 33 to 47 described method, it is characterized in that, this method is used for showing the feature of a particle flux that flows out from a roll crushing support, wherein when the roller passage (6) that constitutes by a pair of roller (2,4) flows out particle flux, extracting sample, and wherein particle flux is that mill streams and sample is the material sample of milling.
49. according to the described method of claim 32, it is characterized in that, from the streams of milling of leaving the roller passage, take out the material sample of milling in different positions.
50. the roll crushing support is characterized in that, shows that for this roll crushing support disposes a feature according to one of claim 30 to 32 described material of milling system (8,10,12,14,24) is in order to show the feature of the streams of milling.
51. according to the described roll crushing support of claim 48, it is characterized in that, for this roll crushing support also disposes:
One comparison means is used for the mill comparison of the specified feature of material of a material characteristics and of milling that detects; With
One adjusting gear be used for according to detect mill between material characteristics and the specified feature of the material of milling deviation adjustment slit spacing or adjust other roll crushing support running parameter in case of necessity.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IBPCT/CH2005/00429 | 2005-05-02 | ||
| PCT/CH2005/000242 WO2006000112A1 (en) | 2004-06-25 | 2005-05-02 | System and method for characterising grinding material in a roller mill |
| PCT/CH2005/000429 WO2006116882A1 (en) | 2005-05-02 | 2005-07-21 | System and method for characterisation of a particle flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101171513A true CN101171513A (en) | 2008-04-30 |
Family
ID=39004828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800496881A Pending CN101171513A (en) | 2005-05-02 | 2005-07-21 | System and method for characterisation of a particle flow |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1877777A1 (en) |
| CN (1) | CN101171513A (en) |
| AU (1) | AU2005331499A1 (en) |
| CA (1) | CA2607200A1 (en) |
| IL (1) | IL187028A0 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316450A (en) * | 2009-11-13 | 2015-01-28 | 布勒股份公司 | Device for determining particle sizes |
| CN104749073A (en) * | 2015-04-02 | 2015-07-01 | 东南大学 | Device and method for testing mechanical strength of particles |
| CN113418845A (en) * | 2021-06-25 | 2021-09-21 | 山东诺方电子科技有限公司 | Maintenance and calibration system and method for dust load acquisition equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116510813B (en) * | 2023-05-16 | 2023-09-19 | 南京巨华工业技术有限公司 | Gangue grinding system using tubular roller mill |
-
2005
- 2005-07-21 CN CNA2005800496881A patent/CN101171513A/en active Pending
- 2005-07-21 AU AU2005331499A patent/AU2005331499A1/en not_active Abandoned
- 2005-07-21 EP EP05759810A patent/EP1877777A1/en not_active Withdrawn
- 2005-07-21 CA CA002607200A patent/CA2607200A1/en not_active Abandoned
-
2007
- 2007-10-30 IL IL187028A patent/IL187028A0/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316450A (en) * | 2009-11-13 | 2015-01-28 | 布勒股份公司 | Device for determining particle sizes |
| CN104316450B (en) * | 2009-11-13 | 2016-08-24 | 布勒股份公司 | For determining the device of particle size |
| CN104749073A (en) * | 2015-04-02 | 2015-07-01 | 东南大学 | Device and method for testing mechanical strength of particles |
| CN104749073B (en) * | 2015-04-02 | 2017-10-10 | 东南大学 | A kind of test device and method of particle mechanical strength |
| CN113418845A (en) * | 2021-06-25 | 2021-09-21 | 山东诺方电子科技有限公司 | Maintenance and calibration system and method for dust load acquisition equipment |
| CN113418845B (en) * | 2021-06-25 | 2023-02-24 | 山东诺方电子科技有限公司 | Maintenance and calibration system and method for dust load acquisition equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1877777A1 (en) | 2008-01-16 |
| CA2607200A1 (en) | 2006-11-09 |
| IL187028A0 (en) | 2008-02-09 |
| AU2005331499A1 (en) | 2006-11-09 |
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Open date: 20080430 |