EP3903231A1 - Method for rough classification of the particle size distribution of a bulk material - Google Patents
Method for rough classification of the particle size distribution of a bulk materialInfo
- Publication number
- EP3903231A1 EP3903231A1 EP20712249.0A EP20712249A EP3903231A1 EP 3903231 A1 EP3903231 A1 EP 3903231A1 EP 20712249 A EP20712249 A EP 20712249A EP 3903231 A1 EP3903231 A1 EP 3903231A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bulk material
- processing
- particle size
- detection
- classifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/26—Segmentation of patterns in the image field; Cutting or merging of image elements to establish the pattern region, e.g. clustering-based techniques; Detection of occlusion
- G06V10/267—Segmentation of patterns in the image field; Cutting or merging of image elements to establish the pattern region, e.g. clustering-based techniques; Detection of occlusion by performing operations on regions, e.g. growing, shrinking or watersheds
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/56—Extraction of image or video features relating to colour
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V2201/00—Indexing scheme relating to image or video recognition or understanding
- G06V2201/06—Recognition of objects for industrial automation
Definitions
- the invention relates to a method for the rough classification of the particle size distribution of a bulk material.
- a bulk material consists of solid parts that are randomly arranged by a bed.
- a bed made of a bulk material normally remains unchanged without further action, so that objects that happen to be on the surface can be visually detected by the bed, whereby these can partially cover one another.
- Particle size is coming. For example, smaller particles can get through gaps more easily, so that their arrangement on a surface is reduced. In the case of very large particles, their distribution is very much dependent on the type of bedding, which is also known as the Brazil nut effect. In the case of bulk goods with different densities or surface properties, on the other hand, the reverse Brazil nut effect can occur, so that a direct connection between the particle size distribution on the surface of a bulk material and the particle size distribution in the volume of the bulk material is not easily possible.
- a method for adapting operating parameters of a roller mill is known from DE 43 25 187 C2.
- a particle size determination in liquid is known from US 2017/0045438 A1.
- Particle size determination in liquid is known from US 2005/0046841 A1.
- a method for identifying and discriminating different heterogeneous materials is known from WO 2014/009384 A2.
- a device for determining the size of particles in a particle flow is known from DE 20 2011 109 943 U1.
- a computer-controlled shredding system is known from DE 16 07 460 B2.
- a roller mill control method is known from DE 43 25 187 C2.
- the object of the invention is to provide a simple and fast inline method which gives a rough indication of the particle size distribution of a bed of bulk material.
- the method according to the invention for the rough classification of the particle size distribution of a bed of bulk material has the following steps:
- the bulk of a bulk material is characterized in that the particles are arranged touching one another.
- the bulk material can experience changes over a longer period of time, for example due to shocks or vibrations, but for the detection of the surface by means of a camera, the bulk material can be viewed as stationary.
- the bulk material can be arranged on a conveyor belt. This can lead to a vibration in the area of the rollers and thus to a change in the packing of the bulk material.
- a few particles are (partially) visible, which are arranged on the surface of the bed. This distinguishes a bulk material from solutions, suspensions or smoke, in which the particles can regularly be viewed in isolation from one another.
- Capturing with a camera means that only particles that lie on the surface of the bulk material are observed. This means that the real particle size distribution cannot be determined because the particles below the surface are not taken into account. However, the size of the particles on a surface gives an indication of how the particle size distribution of the bulk material could be as a whole. This very rough classification is sufficient to control and optimize subsequent processes. At the same time, the optical acquisition is comparatively simple, fast and inexpensive and the evaluation of the optical data can be implemented reliably and easily.
- the classifier By multiplying the average value by the spread, the classifier is spread. Since the very simplified evaluation has shown that the smallest particles are always identified, sometimes also in the form of inclusions within the material, the scatter increases with the particle diameter.
- a suitable classifier results, even if it cannot represent the real particle size distribution.
- the determination of a diameter for a contiguous area can be done in different ways. The simplest method takes the size of the area and calculates the diameter of a circle with the same area. Alternatively or additionally, the diameter of the smallest circle can be determined in which the contiguous area just fits. Alternatively or additionally, the diameter of the largest circle that fits into the contiguous area can be determined. A combination of these methods is possible, which in particular reflects a measure of the regularity of the particles.
- the surface of the bulk material is preferably the surface viewed from above, since a comparatively large surface can often be viewed here. However, the method can also be used laterally, since particles can also be identified on the lateral surfaces. The surface can also be recorded from above and from the side. Either two or more cameras can be used here. Alternatively or additionally, at least one camera and at least one mirror can be used.
- the detection in step a) takes place from above.
- the camera is particularly preferably arranged vertically above the bulk material, which is carried out, for example, on a conveyor belt under the camera.
- the detection in step a) takes place with a shadow-free illumination, in particular with an illumination parallel to the detection direction.
- a shadow-free illumination in particular with an illumination parallel to the detection direction.
- lighting from several directions is of course possible for shadow-free lighting.
- the parallel lighting is preferred because it means the least amount of effort for installation.
- step d) diameters from 0.1 mm to 250 mm, preferably from 0.5 mm to 100 mm, particularly preferably from 1 mm to 50 mm, are sought.
- the restriction in the area of the size of the diameter of the particles represents a further simplification, which clearly simplifies the evaluation, the classifier and the resulting possibility for Control of further processes is not negatively influenced, however, since a higher accuracy of the knowledge of the particle size distribution is not required.
- the method additionally has the following steps:
- the bulk material is particularly preferably transported between the detection in step a) and the detection in step g), the bulk material being rearranged during transport. This occurs, for example, when the bulk material is transferred from one conveyor belt to another, or when the material is rearranged on the conveyor belt due to an installation. This rearrangement can take place, for example, with a rod, a plow or a guide plate, so that a view into the bed is also possible.
- the invention relates to a method for controlling a device for processing bulk material, the method having a method according to the invention for coarse classification of the particle size of a bulk material with the method steps already explained.
- a processing step is carried out at least in step i), the processing step i) being carried out as a function of a first processing parameter.
- the following step is also carried out:
- the processing parameter is a pressure, for example a roller pressure or mill pressure, a speed, a volume flow, a mass flow or an amount of water added.
- the pressure with which the bulk material is further comminuted is reduced if the classifier assumes a small value, which indicates a small particle size.
- the volume flow is reduced if the classifier assumes a large value, which indicates a large particle size.
- the feed mass flow is reduced if the classifier assumes a small value that indicates a small particle size.
- the amount of water added is reduced when the classifier assumes a small value, which indicates a small particle size.
- the processing parameter is determined in step j) with a variation of the processing parameter.
- the product quality is determined after processing step i) as a function of the processing parameters and the classifier, the best processing parameter in each case being determined for the respective classifier. This enables the processing parameter to be optimized as a function of the classifier.
- the processing step i) is a grinding process, a crushing process or a cooling process.
- the method is carried out in a cement plant.
- FIG. 1 shows a flow chart of the method according to the invention.
- step a) the surface of the bulk material is recorded by means of a first camera 40.
- the bulk material is then transported further into a processing device 30 for processing in step i).
- the recording of the camera 40 recorded with the camera 40 is evaluated in step b).
- Related areas are searched for in step c) and a diameter is determined for each connected area found in step d).
- the mean value is formed from all the diameters found and the scatter is determined in step e).
- a classifier is determined in step f).
- a processing parameter is determined as a function of the classifier in step j) and processing step i) is carried out with this processing parameter.
- Fig. 2 shows a first schematic system.
- the system has a bulk material source 10.
- the bulk material source 10 can be, for example, a silo, a crusher, a mill or an oven.
- the bulk material arrives from the bulk material source 10 on a conveyor belt 20 and is transported from there into a processing device 30.
- the processing device 30 can be, for example, a mill, a crusher or an oven.
- a camera 40 is arranged above the conveyor belt 20.
- a light source 50 is arranged to the right and left of the camera 40 in order to enable shadow-free illumination of the surface.
- the second system shown in FIG. 3 differs from the first system shown in FIG. 2 in that the viewing direction of the camera 40 is perpendicular to the conveyor belt 20.
- the third system shown in FIG. 4 differs from the second system shown in FIG. 3 in that the bulk material is transferred from a conveyor belt 20 to a further conveyor belt 20.
- a camera 40 is arranged above both conveyor belts 20. As a result of the pouring over, different particles lie on the surface, so that the detection accuracy can be increased here.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Disintegrating Or Milling (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019204103.5A DE102019204103A1 (en) | 2019-03-26 | 2019-03-26 | Method for the rough classification of the particle size distribution of a bulk material |
PCT/EP2020/056459 WO2020193137A1 (en) | 2019-03-26 | 2020-03-11 | Method for rough classification of the particle size distribution of a bulk material |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3903231A1 true EP3903231A1 (en) | 2021-11-03 |
Family
ID=69846062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20712249.0A Ceased EP3903231A1 (en) | 2019-03-26 | 2020-03-11 | Method for rough classification of the particle size distribution of a bulk material |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3903231A1 (en) |
DE (1) | DE102019204103A1 (en) |
WO (1) | WO2020193137A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021117537B3 (en) | 2021-07-07 | 2022-10-06 | Kleemann Gmbh | Rock processing machine with image acquisition and with image processing by a neural network |
DE102022105343A1 (en) * | 2022-03-08 | 2023-09-14 | Kleemann Gmbh | Method for controlling and/or regulating the supply of material to be processed to a crushing and/or screening system of a material processing facility |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3401891A (en) * | 1966-10-25 | 1968-09-17 | Gen Electric | Control system for a closed circuit grinding system for finish cement |
US4115803A (en) * | 1975-05-23 | 1978-09-19 | Bausch & Lomb Incorporated | Image analysis measurement apparatus and methods |
DK176500B1 (en) * | 1992-07-28 | 2008-06-02 | Kobe Steel Ltd | Method for controlling a roller mill |
SE523635C2 (en) * | 2001-10-03 | 2004-05-04 | Foss Tecator Ab | Sorting of grains during harvest |
US7064826B2 (en) * | 2003-09-03 | 2006-06-20 | Brightwell Technologies | Digital optical measurement of particle populations using reduced magnification |
DE102011115368A1 (en) * | 2011-10-10 | 2013-04-11 | J. Engelsmann Ag | Method and device for determining the size of particles in screenings |
DE102012106132A1 (en) * | 2012-07-09 | 2014-05-08 | Reinhausen Plasma Gmbh | System for identifying or distinguishing heterogeneous material, has local apparatus with local computers that are communicatively connected with server of central portion through network |
US20170045438A1 (en) | 2014-02-20 | 2017-02-16 | Malvern Instruments Limited | High-Throughput Fluid Sample Characterization |
-
2019
- 2019-03-26 DE DE102019204103.5A patent/DE102019204103A1/en not_active Ceased
-
2020
- 2020-03-11 EP EP20712249.0A patent/EP3903231A1/en not_active Ceased
- 2020-03-11 WO PCT/EP2020/056459 patent/WO2020193137A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2020193137A1 (en) | 2020-10-01 |
DE102019204103A1 (en) | 2020-10-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2375380B1 (en) | Method and device for measuring a parameter during the transport of objects to a processing device | |
WO2020193137A1 (en) | Method for rough classification of the particle size distribution of a bulk material | |
EP2322911A1 (en) | Device for determining particle sizes | |
DE69019582T2 (en) | Method of measuring the average particle size in granular material. | |
DE102012107278A1 (en) | Method and device for monitoring a meat processing machine | |
DE102010022455A1 (en) | Method and apparatus for recognizing an object containing a target mineral | |
DE102021204390A1 (en) | Process for particle size-dependent efficient use of a screening device | |
DE102018127844A1 (en) | Process for regulating the operation of a machine for harvesting root crops | |
EP2932478B1 (en) | Method for providing measurement data from a device for processing value documents and value document processing device | |
DD230758A1 (en) | DEVICE FOR CONTROLLING AND MONITORING OF CHOCOLATE FILM THICKNESS IN CHOCOLATE REFINING MACHINES | |
EP3108461B1 (en) | Method for examining a value document, and means for carrying out the method | |
DE10218424A1 (en) | Malt mill sensors for correction of production process via regulation algorithm, comprises continually monitoring process parameters | |
EP3403027B1 (en) | Analysis and regulating method for multi-fuel burners | |
WO2017009158A1 (en) | Method for controlling a combustion process | |
WO2016107722A1 (en) | Method for determining particles | |
WO2021226649A1 (en) | Method of dust suppression for crushers with spraying devices | |
DE19882394B4 (en) | Method for determining the proportion of wood material present in a bark stream | |
EP3322983B1 (en) | Method for processing substitute fuel and method for subsequently analyzing the substitute fuel | |
DE3590102T1 (en) | Method of measuring a size distribution | |
DE102018105134A1 (en) | Method for operating a grinding device and grinding device | |
DE202016102672U1 (en) | Mahlkugelsortiervorrichtung | |
DE102013112949A1 (en) | Apparatus and method for gluing fibers or fiber-like material | |
EP3322937B1 (en) | Method for observing emission limits in a combustion process | |
EP4405659A1 (en) | Method and device for determining a parameter of a size distribution of a mixture, plant for manufacturing material boards, and computer programme product | |
AT511399B1 (en) | METHOD FOR THE AUTOMATED CLASSIFICATION OF INCLUSIONS |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17P | Request for examination filed |
Effective date: 20210728 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
17Q | First examination report despatched |
Effective date: 20211012 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R003 |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 20220525 |