• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Measuring instrument and method for analyzing particles, such as sugar and coffee, consisting of two dosing channels attached to each frequency controlled vibration generator, which is controlled by signals from cameras, located below each dosing channel. Below each dosing channel there is a light source and camera used to record images of particles falling from the dosing channels. The signals from the cameras are received by a computer analyzing them, and based on the measured particle densities between the first and last dosing tubes and after the last dosing tubes, the feed rate in the two dosing tubes is controlled. The feed rate in the last dosing tube is set high, while the first dosing tube is controlled such that a constant flow of particles is obtained to the subsequent dosing tube, while the flow rate is adjusted to the particle separation as they leave the last dosing tube.
    公开号:DK201600503A1
    申请号:DKP201600503
    申请日:2016-08-30
    公开日:2018-03-19
    发明作者:Janus Egholm
    申请人:Scangrading Aps；
    IPC主号:
    专利说明:

    < 1 θ> DENMARK
    0 °) DK 2016 00503 A1
    PATENT APPLICATION
    (12)
    Patent and
    Trademark Office (51) Int.CI .: G 01N 15/02 (2006.01) (21) Application number: PA 2016 00503 (22) Filing date: 2016-08-30 (24) Running day: 2016-08-30 (41) Aim. available: 2018-03-01 (71) Applicant: SCANGRADING ApS, Farum Gydevej 65, st. 2., 3520 Farum, Denmark (72) Inventor: Janus Egholm, Fuglevænget 11.3520 Farum, Denmark (74) Plenipotentiary: Holme Patent A / S, Valbygårdsvej 33,1., 2500 Valby, Denmark (54) Name: Measuring instrument for particle analysis and, in particular, particle analysis (56) Published publications:
    WO 02/44692 A1 EP 0195420 A2 EP 2581726 A2 JP 2016-200518 A (57) Summary:
    Measuring instrument and method for analyzing particles, such as sugar and coffee, consisting of two dosing channels attached to each frequency controlled vibration generator, which is controlled by signals from cameras, located below each dosing channel. Below each dosing channel there is a light source and camera used to record images of particles falling from the dosing channels. The signals from the cameras are received by a computer analyzing them, and based on the measured particle densities between the first and last dosing channels and after the last dosing channel, the feed rate is controlled in the two dosing channels.
    The feed rate in the last dosing tube is set high, while the first dosing tube is controlled such that a constant flow of particles is obtained to the subsequent dosing tube, while the flow rate is adjusted to the particle separation as they exit the last dosing tube.
    To be continued ...
    DK 2016 00503 A1
    FIG. First
    DK 2016 00503 A1
    The invention relates to a measuring instrument for analyzing particles and in particular for analyzing particle sizes for small particles.
    In many industrial productions, such as In sugar production, the distribution of grain size is an important parameter in production, but also for many of the industries that use sugar in their products, grain size distribution is important. As an example, the dissolution rate is dependent on the grain size, and therefore the grain size is often controlled by the end user. This applies to cake makers, candy makers, soda makers, etc. The check is often carried out as a sample check, where samples are taken from the production, which are analyzed in special instruments that can specify the grain size distribution.
    There are manual methods based on a series of screens in which the screens have a decreasing mesh size and where what is on each screen is weighed. From the sieved fractions, the grain size distribution is then calculated. In the sugar industry, this method is called the ICUMSA method.
    There are also computer-based analysis methods in which the material samples are tried separately and where the images of the particles are taken freely. Based on image analysis, the size of the particles and the distribution are calculated.
    In the known solutions, where dosing troughs are used for dosing particles, it is the shape of the shaking end and the shaking speed that depends on how much the particles can be separated before falling over the edge of the shaking end. This type of particle separation is difficult or impossible to control. This is especially difficult for small particles where the dispersion in the particle size is relatively large. In an attempt to control the amount of particles advanced at the shaker end, solutions are found in existing systems where the filling funnel neck is brought close to the shaker end to limit the layer thickness at the shaker end or where an additional vibrator is applied to the shaker end so that vibration end is applied to vibrations perpendicular to the direction of feed.
    In order for the computer-based analysis method to be accurate, it is important that the particles do not overlap as they fall through the area where the images are generated. If particles are coincident, the image analysis will perceive two or more coincident particles as one particle and thus the particle distribution will be incorrect.
    DK 2016 00503 A1
    In products such as sugars tend to stick to the grains or stick to the substrate they are in contact with, and both cause inaccuracies in the computer-based analysis methods, the size distribution being based on the results of the image analysis.
    In view of the above, the object of this invention is to make a measuring instrument for determining particle size, shape and color. The instrument incorporates a particle separation system so that the particle size and shape can be measured with great precision.
    The object is solved with a measuring instrument for measuring particle size, shape and color which is in accordance with the invention and having the functions mentioned in claim 1.
    The method which is in accordance with the invention is described in claim 7. The further embodiment of the invention is further described in the subclaims.
    The measuring instrument for measuring particles which is in accordance with the invention for analyzing particles is mainly intended to determine the distribution of the particle size in a bulk material sample and in the instrument two dosage troughs are built into it. On each dosing channel there is attached a frequency controlled vibrator which can vary in vibration strength and thus the dosing channel can transport the particles at different speeds from the closed end to the open end. The dosing channels are positioned so that the latter receives the particles from the first dosing channel. Under the first dosing tube is light and camera equipment that can measure particle density, while under the last dosing tube is light and camera equipment that measures the particle size and particle density. The two sets of cameras are connected to a computer that performs the analysis of the signals from the cameras.
    With the two dosing channels, it is possible to dose the particles from the first to the last dosing tube so that the particles during transport on the last dosing tube are separated before falling over the edge of the last dosing tube. In this way, it will be possible to obtain good precision for the analysis results calculating the particle distribution, and the device with two dosing channels mounted on frequency controlled vibration generators also ensures a high reproducibility.
    DK 2016 00503 A1
    Furthermore, with a color camera below the dosing channel it is possible to measure the color of the particles, which may also be a parameter that the manufacturer and the end user will know. Eg. it may be important for the end users of sugar. Used for soft drinks which must be well defined or not colored.
    Both dosing edges are attached to a frequency controlled vibration generator, and the vibration rate of both dosing edges is controlled by the computer's image analysis results. The rate of vibration of the first dosing tube is controlled by the analysis, which gives the particle density on its way to the last gutter. In case the density is greater than desired, the vibration rate is reduced and vice versa if the particle density becomes less than desired.
    Basically, the last dosing channel has a high feed rate relative to the first rate of feed rate, thus separating the particles before falling out of the open end of the last dosing tube. In addition to measuring the particle size, the particle density of the particles falling from the open end of the last dosing channel is also analyzed. Here we examine whether there is overlap. Should overlap situations occur, the speed of the last dosing tube is reduced until the particle density is again as desired and the vibration rate is again set at an appropriate pace until the desired high speed is achieved. If it is not possible to achieve the desired high velocity that separates the particles sufficiently, the desired particle density from the first dosing tube will be adjusted down to achieve the desired feeding rate on the last gutter.
    As the first dosing tube is emptied, fewer and fewer particles get to the last gutter and the particle density detected by the camera system becomes smaller and smaller. The computer receives signals on this and transmits signal to the vibration generator's frequency converter, after which the vibration rate of the first dosing ring is increased to eventually be at maximum. When the rate of vibration of the dosing channel is at its maximum, the last particles which may adhere to the surface are detached. When, after a predetermined amount of time, no more particles appear beyond the open edge of the last dosing tube, both vibrators stop and the computer calculates the particle distribution and possibly the color of the sample.
    DK 2016 00503 A1
    The two dosing troughs of the described measuring instrument can be placed at a horizontal angle at any relative angle to each other, and the open end of the first dosing trough supplies material to the last dosing trough. The slope of the dosage gutters in the instrument described is positive, but may be either positive, zero or negative relative to the horizontal.
    In all embodiments of the measuring instrument, there are one or more computers analyzing data from the cameras for analyzing the particle sample as well as for controlling the vibration rate of the dosing channels.
    In measuring instruments that, in addition to particle size and shape, also measure color, at least one color camera is installed under one of the renderings.
    Other advantages and features of this invention follow from the design, which will be explained in more detail below with reference to the accompanying drawings.
    The enclosed drawings are:
    Fig.1. shows a schematic side view of a measuring instrument for particle analysis, in accordance with the invention.
    FIG. 2. shows a schematic view of the dosage troughs seen from above in the particle analysis instrument, in accordance with the invention.
    Referring to FIG. 1 and 2, the design of the particle analysis instrument according to the invention is described as follows.
    The camera-based measuring instrument, which is schematically shown as a side view in FIG. 1 should be used to analyze particles 2 and especially small and very small particles in bulk goods, such as sugar, coffee and the like. Some single particles 18 and 23 are shown in FIG. First
    The particle distribution in the two dosing troughs is shown in schematic form in Fig. 2, and the dosing trench 1, which is the first of two troughs in the design of the measuring instrument, is formed with a closed end 4 and an open end 5, where the particles are conveyed thus. the particles 6 are freely fed to the last dosing tube 17.
    In FIG. 1, the dosing channel 1 is shown at a positive angle 20 with respect to the horizontal so that it falls from the closed end 4 to the open end 5. With this design, gravity will assist in the movement of the particles 2 towards the open end 5, but in
    In other embodiments, the angle 20 may become 0 (horizontal) or negative with an increase from the closed end 4 to the open end 5.
    The metering channel 1 is connected to a frequency controlled vibration generator 19 by a mechanical connection 3.
    The function of the frequency controlled vibration generator 19 is to create propulsion of the particles 2 on the dosing channel 1, and by increasing or decreasing the frequency of the motor of the vibration generator 19, the propulsion of the particles 2 can be controlled according to the particle density observed by the camera 7.
    In FIG. 1, the dosing channel 17 is shown at a positive angle 22 with respect to the horizontal so that it falls from the closed end 10 to the open end 16. In this embodiment, gravity will assist in the movement of the particles 18 towards the open end 16, but in in other embodiments, the angle 22 may become 0 (horizontal) or negative with a rise from the closed end 10 to the open end 16.
    The metering channel 17 is connected to a frequency controlled vibration generator 12 by a mechanical connection 11.
    The function of the frequency controlled vibration generator 12 is to create sufficient momentum for the particles 6, which fall on the dosing channel 17, to advance at high speed towards the open end 16 of the dosing channel 17. Thus, the particles 18, as shown in Fig. 2, are separated. they fall beyond the edge of the open end 16.
    In order to carry out the measurement of particle density and, optionally, color of the particles 6, a light source 8 is placed so that the particles 6 fall through the optical path 9 between the camera 7 and the light source 8 on the way down the dosing channel 17.
    To carry out the measurement of particle size, shape, density and any color, a light source 15 is lit which shines against the camera 13 and the particles 18 which fall beyond the open end 16 of the dosing channel 17 pass the optical path 14 between the light source 15 and the camera 13.
    The cameras 7 and 13 and the vibration generators 19 and 12 are connected to a computer unit 21 which receives signals from the cameras 7 and 13.1 The computer unit 21 analyzes the signals from the camera 7 for particle density and possibly color, while
    The 2016 signals from camera 13 are analyzed for particle size, shape, density and any color.
    From the analysis results of the particle density of the particles 6, a signal is sent to the frequency converter of the vibration generator 19 and the desired frequency is set. In this way, the desired particle density is always obtained, which is adjusted such that the particles 18 are sufficiently separated before falling beyond the edge at the open end 16 of the dosing channel 17.
    Basically, the speed of the frequency-controlled vibration generator 12 must be high, but it can be controlled by the computer unit 21. This is done in case the camera 13 detects excessive particle density of the particles 23 falling beyond the edge at the open end 16 of the dosing channel 17. In case of excessive particle density of the particles 23 in the free fall after the open end 16, the speed of the vibration generator 12 is temporarily reduced until the particle density is normalized. Thereafter, the speed of the vibration generator 12 is increased again to the desired high value.
    If the particle density of the particles 6 observed by the camera 7 is too large, there is a risk that the separation of the particles in the subsequent dosing tube 17 is not sufficient, and thus overlap of the particles 23 falling over the edge of the open end 16 of the dosing channel 17.1 In this situation, more particles may be seen as an oversized particle, and the measurement of such overlapping particles will give the wrong result.
    In the case of persistent overlapping particles 23, the measurement of the size distribution becomes incorrect and the result of the analysis becomes worthless.
    In the event that the camera 13 measures excessive particle density of the particles 23, the signal is sent to the computer unit 21 which reduces the desired particle density of the particles 6 measured by the camera 7, thereby sending signal to the vibration generator 19 so as to reduce the feed rate of the particles 2 . In this way, an optimal separation of the particles 23 is achieved before the particle analysis, while at the same time the analysis speed is optimal for the current sample.
    When no more particles reach beyond the open end 5 of the dosing channel 1, the frequency of the vibration generator 19 is increased until the frequency is at its maximum, and in this way, the dosing channel 1 is emptied for possible. small particles that are stuck on
    DK 2016 00503 A1 surface. When the dosing gutter 1 and 17 have run at maximum for a predefined time set in the computer 21, the system is stopped and the system is ready for the next test. This method of emptying the particulate system means that it is only necessary in rare cases to perform a manual cleaning of the dosing channels 1 and 17.
    In its entirety, the invention is a small particle measuring instrument that provides analysis results on the bulk parameters (small particles) of specific parameters comparable to the recognized manual methods, e.g. ICUMSA for sugar. This applies to particle size, particle shape, size distribution and color.
    DK 2016 00503 A1
    权利要求:
    Claims (9)
    [1]
    claims
    1) A measuring instrument for the analysis of particles and especially small particles, consisting of two dosing channels attached to each frequency controlled vibration generator as well as lights and cameras under each of the dosing channels. The dosing channels are positioned relative to each other so that the first one is higher than the last, and thus the particles can freely be delivered to the last dosing channel. The vibration generators and cameras are connected to a computer device. The rate of dosing in the dosing channels is controlled by the signals from the cameras which are analyzed in the computer unit. The characteristic of this device is that the particle stream which falls beyond the edge of the first end of the first dosing channel is controlled so that the particles in the last dosing tube are separated before falling over the edge of the open end of the last dosing tube.
    [2]
    2) The particle analysis instrument according to claim 1) contains two camera units and two light sources. One set of light and camera is placed under the first dosing tube, while the second set of camera and light is placed under the last dosing tube. Placement of light and camera in both cases is such that the particles fall freely through the optical path between camera and light source.
    [3]
    3) The particle analysis instrument according to claim 1) includes a computer unit whose purpose is to receive the signals from the cameras and analyze them to control the vibration generators and to analyze the individual particles.
    [4]
    The measuring instrument for analyzing particles according to claim 1) wherein each of the two dosing gutters is attached to a frequency controlled vibration generator such that the vibration speed of the dosing gutters can each be controlled independently of one another. When there is not a sufficient amount of particles beyond the edge of the first gutter, the vibration rate is set up at this dosing channel and finally, when only a few particles are left, the dosing channel is emptied in time at full speed on both vibration generators. In this way, the very small particles that tend to adhere together and bind to the surface of the dosing channels are detached, thus reliably analyzing the particle distribution.
    DK 2016 00503 A1
    [5]
    The measuring instrument for analyzing particles according to claim 1) wherein the dosing gutters have a slope from the closed end to the open end which can be downward, horizontal or upward.
    [6]
    The measuring instrument for analyzing particles according to claim 1) wherein the dosing gutters are formed with a closed end, an open end and with sides which ensure that the particles do not leave the dosing trough before the particles fall beyond the edge of the dosing open end, while the bottom can be concave, convex or completely flat. The design of the first and last dosing tubes may differ.
    [7]
    7) A method for analyzing particles where particle samples are transported in two dosing channels with vibration generators controlled in such a way that the particles on the last dosing tube are separated before falling freely through the optical path after the last dosing tube. The method is characterized in that the particle flow beyond the edge of the first dosing tube is controlled by the signals from the camera during the first dosing tube, and that there is feed back of the signals from the camera during the last dosing tube to the computer unit such that any excessive particle density which falling through the optical path after the last dosing tube results in a reduction in particle flow from the first dosing tube, as well as a temporary reduction in transport on the last dosing tube.
    [8]
    The method according to claim 7) wherein the speed of the frequency controlled vibration generators on both dosing channels is controlled continuously.
    [9]
    The method according to claim 7) wherein the speed of the frequency controlled vibration generators is set at full speed and controlled on time when the sample is terminated.
    DK 2016 00503 A1
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    同族专利:
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    WO2018041314A1|2018-03-08|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    WO2002044692A1|2000-11-28|2002-06-06|Imeco Automazioni S.R.L.|Apparatus for analyzing the characteristics of ground products|
    EP2581726A2|2011-10-10|2013-04-17|J. Engelsmann AG|Method and apparatus for the determination of particles in screenings|
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    SI2591901T1|2011-11-14|2015-11-30|Ultrasion S.L.|Plastic pellet dosing method|CN110006793B|2019-05-08|2020-02-07|中南大学|Testing device and method for researching motion characteristics of particle materials under vibration load|
    法律状态:
    2020-01-22| PME| Patent granted|Effective date: 20200122 |
    优先权:
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    DKPA201600503A|DK180012B1|2016-08-30|2016-08-30|Measuring instrument for analyzing particles and especially for analyzing small particles|DKPA201600503A| DK180012B1|2016-08-30|2016-08-30|Measuring instrument for analyzing particles and especially for analyzing small particles|
    EP17768355.4A| EP3507586B1|2016-08-30|2017-08-18|A measuring device for analysis of particles and method of analyzing particles using the measuring device|
    DK17768355.4T| DK3507586T3|2016-08-30|2017-08-18|Measuring device for analyzing particles and method for analyzing particles using the measuring device|
    PCT/DK2017/050267| WO2018041314A1|2016-08-30|2017-08-18|A measuring device for analysis of particles and method of analyzing particles using the measuring device|
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