Method, device, processor and storage medium for determining particle size

Abstract

The embodiment of the present invention provides a method and device, a processor and a storage medium for determining the particle size of particles, which belongs to the field of particle size measurement technology. The method for determining the particle size of particles includes: obtaining an image of the particles to be measured entering the circulation pool acquired by an image acquisition device; processing the image to determine the sedimentation height and appearance information of the particles to be measured; identifying the particle type corresponding to the particles to be measured according to the appearance information, wherein the particle types include spherical particles and flaky particles; when the particles to be measured are spherical particles, determining the particle size of the particles to be measured according to the sedimentation height; when the particles to be measured are flaky particles, determining the particle size of the particles to be measured according to the appearance information. The present invention can improve the accuracy of particle size measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of particle size measurement, and in particular to a method and device, a processor and a storage medium for determining the particle size of particles. Background Art

[0002] In the prior art, there are many methods for measuring the particle size of particles (such as mineral raw materials), such as the traditional sedimentation method and the laser diffraction method that emerged with the development of laser technology. The particle size measured by the hydrometer method, one of the sedimentation methods, is equivalent to the diameter of a sphere with the same sedimentation velocity, while the average sedimentation velocity of non-spherical particles such as flakes is smaller than that of a sphere of the same volume. Many mineral raw materials are mainly in the form of flakes, which makes the traditional methods cause the results to deviate from the true value, resulting in a large error; and the laser particle size method has low light scattering energy for small particles with a diameter of less than 0.02μm, so it may cause missed detection. Therefore, the existing particle size measurement methods have the problem of low accuracy. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a method and device, a processor and a storage medium for determining the particle size, so as to solve the problem of low accuracy in the prior art.

[0004] In order to achieve the above object, a first aspect of an embodiment of the present invention provides a method for determining the particle size of a particle, the method comprising:

[0005] Acquire an image of the particles to be tested entering the circulation pool captured by an image acquisition device;

[0006] Processing the image to determine the sedimentation height and appearance information of the particles to be tested;

[0007] Identifying the particle type corresponding to the particle to be tested according to the appearance information, wherein the particle types include spherical particles and flake particles;

[0008] When the particles to be tested are spherical particles, the particle size of the particles to be tested is determined according to the sedimentation height;

[0009] When the particles to be measured are flaky particles, the particle size of the particles to be measured is determined based on the appearance information.

[0010] In an embodiment of the present invention, an image acquisition device includes a first image acquisition device and a second image acquisition device, wherein the first image acquisition device and the second image acquisition device are respectively arranged on the front side and the bottom side of the outside of the circulation pool, and are respectively used for image acquisition in the front direction and image acquisition in the bottom direction; the image includes a first image acquired by the first image acquisition device and a second image acquired by the second image acquisition device; the image is processed to determine the sedimentation height and appearance information of the particle to be measured, including: binarizing the first image and the second image respectively to extract a first contour image of the particle to be measured on the first image and a second contour image on the second image; determining the sedimentation height of the particle to be measured according to the center coordinates of the first circumscribed circle corresponding to the first contour image, wherein the number of the first contour images is at least two; determining the aspect ratio of a first circumscribed rectangle corresponding to the first contour image and the aspect ratio of a second circumscribed rectangle corresponding to the second contour image to obtain the appearance information of the particle to be measured.

[0011] In an embodiment of the present invention, the type of particle corresponding to the particle to be tested is identified based on the appearance information, including: determining the particle to be tested whose aspect ratio of the first circumscribed rectangle and the aspect ratio of the second circumscribed rectangle are both within the first preset ratio range as a spherical particle; and determining the particle to be tested whose aspect ratio of the first circumscribed rectangle and / or the aspect ratio of the second circumscribed rectangle are not within the first preset ratio range as a flake particle.

[0012] In an embodiment of the present invention, when the particles to be measured are spherical particles, the particle size of the particles to be measured is determined according to the sedimentation height, including: determining the sedimentation time of the particles to be measured according to the center coordinates of the second circumscribed circle corresponding to the second contour image, wherein the number of second contour images is at least two and the second contour image and the first contour image are obtained at the same time; determining the particle size of the particles to be measured according to the sedimentation height, the sedimentation time and preset parameters.

[0013] In an embodiment of the present invention, the preset parameters include the viscosity of the sedimentation medium, the specific gravity of the sedimentation medium, and the specific gravity of the particles to be measured; the particle size of the particles to be measured is determined according to the sedimentation height, the sedimentation time, and the preset parameters, including determining according to the following formula:

[0014]

[0015] Where r is the radius of the particle to be measured, η is the viscosity of the sedimentation medium, Yk is the specific gravity of the particle to be measured, Yt is the specific gravity of the sedimentation medium, H is the sedimentation height, t is the sedimentation time, and g is the gravitational acceleration.

[0016] In an embodiment of the present invention, the appearance information further includes a width ratio of an upper width to a lower width of a circumscribed quadrilateral corresponding to the first contour image; when the particle to be measured is a flaky particle, determining the particle size of the particle to be measured according to the appearance information includes: when the width ratio is within a second preset ratio range, determining the flaky particle to be a cylindrical flaky particle; determining the product of the area of ​​the second contour image and the height of the first contour image as the volume of the cylindrical flaky particle; determining the diameter of a spherical particle having the same volume as the cylindrical flaky particle as the particle size of the particle to be measured; preferably, when the particle to be measured is a flaky particle, determining the particle size of the particle to be measured according to the appearance information also includes: when the width ratio is not within the second preset ratio range, determining the flaky particle to be a conical flaky particle; determining one third of the product of the area of ​​the second contour image and the height of the first contour image as the volume of the conical flaky particle; determining the diameter of a spherical particle having the same volume as the conical flaky particle as the particle size of the particle to be measured.

[0017] In an embodiment of the present invention, when the particles to be measured are spherical particles, the particle size of the particles to be measured is determined according to the sedimentation height, including: when the particles to be measured are spherical particles, determining the first particle size of the particles to be measured according to the sedimentation height; determining the second particle size of the particles to be measured according to appearance information; and determining the average value of the first particle size and the second particle size as the particle size of the particles to be measured.

[0018] A second aspect of an embodiment of the present invention provides a processor configured to execute the above-mentioned method for determining the particle size.

[0019] A third aspect of an embodiment of the present invention provides an apparatus for determining the particle size of particles, comprising: a circulation pool, for providing an isolated environment for the particles to be measured; an image acquisition device, for acquiring images of the particles to be measured entering the circulation pool; and a processor according to the above; preferably, the image acquisition device comprises a first image acquisition device and a second image acquisition device, wherein the first image acquisition device and the second image acquisition device are respectively arranged on the front side and the bottom side of the outside of the circulation pool, and are respectively used for image acquisition in the front direction and image acquisition in the bottom direction.

[0020] A fourth aspect of an embodiment of the present invention provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor executes the above-mentioned method for determining the particle size.

[0021] The above technical solution obtains the image of the particle to be tested entering the circulation pool collected by the image acquisition device, and processes the image to determine the sedimentation height and appearance information of the particle to be tested, and then identifies the particle type corresponding to the particle to be tested according to the appearance information. When the particle to be tested is a spherical particle, the particle size of the particle to be tested is determined according to the sedimentation height. When the particle to be tested is a flaky particle, the particle size of the particle to be tested is determined according to the appearance information. The above particle size determination method can be applied to particles of most shapes, and different particle size determination strategies are used for particles of different shapes and types, which improves the accuracy of particle size measurement and increases the particle size range of measurable materials. At the same time, it avoids the problem of inaccurate particle size calculation of flaky non-spherical particles in the prior art, improves the efficiency of detection while ensuring the accuracy, and speeds up the detection.

[0022] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0024] Figure 1 The flowchart of the method for determining the particle size of particles in one embodiment of the present invention is schematically shown;

[0025] Figure 2 The schematic diagram of the process of the method for determining the particle size of particles in a specific embodiment of the present invention is shown;

[0026] Figure 3 The schematic diagram of the structure of the circulation pool in one embodiment of the present invention is shown;

[0027] Figure 4 The schematic diagram of a detection system for determining the particle size of particles in one embodiment of the present invention is shown schematically.

[0028] Description of Reference Numerals

[0029] 1 Transfer tube 2 Flow cell front camera

[0030] 3 Flow cell bottom camera DETAILED DESCRIPTION

[0031] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0032] Figure 1The following is a schematic diagram of a method for determining the particle size of particles according to an embodiment of the present invention. Figure 1 As shown, in an embodiment of the present invention, a method for determining particle size is provided. Taking the method applied to a processor as an example for explanation, the method may include the following steps:

[0033] Step S102, obtaining an image of the particles to be tested entering the circulation pool captured by an image acquisition device.

[0034] It can be understood that the particles to be tested are particles whose size needs to be measured or determined. Particles refer to extremely small particles, including molecules, atoms, ions, etc. that are invisible to the naked eye, and their combinations. Particle size refers to the size of the particles, which can also be called particle size. Usually, the particle size of spherical particles is expressed by diameter, and the particle size of cubic particles is expressed by side length. For irregular particles, the diameter of a sphere with the same behavior as the particle can be used as the equivalent diameter of the particle, that is, the equivalent particle size. The circulation pool is used to provide an isolated environment for the particles to be tested, usually made of quartz, that is, transparent glass. The movement of the particles to be tested in the circulation pool is not affected by factors such as external air. Specifically, if the circulation pool is a closed container, the particles to be tested can settle to the bottom of the circulation pool after entering the circulation pool. The image acquisition device is a device that can collect particle images, such as a microscope camera. Furthermore, the image acquisition device can also be set on a movable object or device (such as a drone), so that image acquisition in multiple dimensions or angles can be achieved to obtain a more three-dimensional particle image.

[0035] Specifically, after the particles to be tested enter the circulation pool, an image acquisition device (e.g., a microscope camera) can take pictures of the particles to be tested in the circulation pool, thereby acquiring images of the particles to be tested moving in the circulation pool, and the processor can obtain the images acquired by the image acquisition device. Further, in the process from the particles entering the circulation pool to settling to the bottom of the circulation pool, the image acquisition device can perform image acquisition at a preset interval (e.g., 0.5 seconds), so that the processor can acquire multiple images including the particles to be tested. Further, the number of particles to be tested can be one or more.

[0036] Step S104: Process the image to determine the sedimentation height and appearance information of the particles to be tested.

[0037] It can be understood that the sedimentation height of the particles to be tested is the falling height of the particles to be tested, and the appearance information of the particles to be tested is the external characteristic information such as the appearance size of the particles to be tested. The sedimentation height and appearance information of the particles to be tested can be determined by the image of the particles to be tested.

[0038] Specifically, the processor can process the image. For example, it can determine the difference in height between the pixel points where the centers of the particles to be tested in the two images are located, thereby determining the sedimentation height of the particles to be tested. In addition, the appearance information of the particles to be tested can be determined based on the contour shape and / or area and / or length and width information of the pixel points corresponding to the particles to be tested in the image.

[0039] In one embodiment, an image acquisition device includes a first image acquisition device and a second image acquisition device, wherein the first image acquisition device and the second image acquisition device are respectively arranged on the front side and the bottom side of the outside of the circulation pool, and are respectively used for image acquisition in the front direction and image acquisition in the bottom direction; the image includes a first image acquired by the first image acquisition device and a second image acquired by the second image acquisition device; the image is processed to determine the sedimentation height and appearance information of the particle to be measured, including: binarizing the first image and the second image respectively to extract a first contour image of the particle to be measured on the first image and a second contour image of the particle to be measured on the second image; determining the sedimentation height of the particle to be measured according to the center coordinates of a first circumscribed circle corresponding to the first contour image, wherein the number of the first contour images is at least two; determining the aspect ratio of a first circumscribed rectangle corresponding to the first contour image and the aspect ratio of a second circumscribed rectangle corresponding to the second contour image to obtain the appearance information of the particle to be measured.

[0040] It can be understood that the first image acquisition device is used to acquire the front image of the particle to be measured, which can be regarded as a front view projection or a main view projection, and the second image acquisition device is used to acquire the bottom image of the particle to be measured, which can be regarded as a top view projection. The first image acquisition device can be set on the front side of the outside of the circulation pool or the opposite side of the front side, i.e., the back side, and the second image acquisition device can be set on the bottom side (i.e., the bottom) of the outside of the circulation pool or the opposite side of the bottom side, i.e., the top side. The first image is the image acquired by the first image acquisition device, and the second image is the image acquired by the second image acquisition device. The first contour image is the image that only includes the particle to be measured on the first image, and the second contour image is the image that only includes the particle to be measured on the second image.

[0041] Specifically, the processor can perform binarization processing on the first image and the second image respectively, so as to obtain a grayscale image, extract the pixel points in the grayscale image that are inconsistent with the background grayscale, so as to identify the contour of the particle, that is, extract the first contour image of the particle to be measured on the first image and the second contour image on the second image, so as to determine the center coordinates of the first circumscribed circle corresponding to the first contour image, the number of first contour images is at least two, and two are used as an example for explanation. When the number of first contour images is two, that is, the number of first images is two, respectively corresponding to the first images of the particle to be measured at different times, the processor can determine the difference between the center coordinates of the first circumscribed circles corresponding to the two first contour images as the sedimentation height of the particle to be measured. In addition, the processor can also determine the aspect ratio of the first circumscribed rectangle corresponding to the first contour image and the aspect ratio of the second circumscribed rectangle corresponding to the second contour image, so as to obtain the appearance information of the particle to be measured.

[0042] In some embodiments, the processor can also determine the sedimentation height of the particle to be measured based on the center coordinates of the first inscribed circle corresponding to the first contour image, where the number of first contour images is at least two; determine the aspect ratio of the first inscribed rectangle corresponding to the first contour image and the aspect ratio of the second inscribed rectangle corresponding to the second contour image to obtain the appearance information of the particle to be measured.

[0043] Step S106 , identifying the particle type corresponding to the particle to be tested according to the appearance information, wherein the particle types include spherical particles and flake particles.

[0044] Specifically, the processor can identify and determine the particle type corresponding to the particle to be tested as a spherical particle or a flake particle based on the appearance information (eg, the contour shape of the pixel corresponding to the particle to be tested). It can be understood that the shape of the particle to be tested usually includes spherical and flake.

[0045] In one embodiment, identifying the type of particle corresponding to the particle to be tested based on appearance information includes: determining the particle to be tested, whose aspect ratio of the first circumscribed rectangle and the aspect ratio of the second circumscribed rectangle are both within a first preset ratio range, as a spherical particle; and determining the particle to be tested, whose aspect ratio of the first circumscribed rectangle and / or the aspect ratio of the second circumscribed rectangle are not within the first preset ratio range, as a flake particle.

[0046] It can be understood that the first preset ratio range is a reference range of the preset length-width ratio of the first circumscribed rectangle corresponding to the first contour image and the length-width ratio of the second circumscribed rectangle corresponding to the second contour image. The length-width ratio is the ratio of the length and width of the rectangle. When the length-width ratio of the first circumscribed rectangle and the length-width ratio of the second circumscribed rectangle are both within the first preset ratio range, the processor can determine that the particle to be detected is a spherical particle, otherwise the particle to be detected is a flake particle. The specific value range of the first preset ratio range can include, for example, 0.8 to 1.2, that is, a range centered on 1, which can be set according to actual conditions. If the length-width ratio of the first circumscribed rectangle and the length-width ratio of the second circumscribed rectangle are both close to 1, it can be indicated that the particle to be detected is a spherical particle. If at least one of the length-width ratio of the first circumscribed rectangle and the length-width ratio of the second circumscribed rectangle is far from 1, for example, not within the range of 0.8 to 1.2, it can be indicated that the particle to be detected is a flake particle.

[0047] In some embodiments, the processor may also determine the particles to be tested whose length-to-width ratio of the first inscribed rectangle and the length-to-width ratio of the second inscribed rectangle are both within the first preset ratio range as spherical particles; and determine the particles to be tested whose length-to-width ratio of the first inscribed rectangle and / or the length-to-width ratio of the second inscribed rectangle are not within the first preset ratio range as flake particles.

[0048] Step S108: when the particle to be measured is a spherical particle, the particle size of the particle to be measured is determined according to the sedimentation height.

[0049] Specifically, if the processor identifies the particle to be detected as a spherical particle, the particle size of the particle to be detected can be determined according to the sedimentation height of the particle to be detected, for example, the particle size of the particle to be detected can be determined according to the correspondence between the sedimentation height and the sedimentation time.

[0050] In one embodiment, when the particles to be tested are spherical particles, the particle size of the particles to be tested is determined based on the sedimentation height, including: determining the sedimentation time of the particles to be tested based on the center coordinates of a second circumscribed circle corresponding to the second contour image, wherein the number of second contour images is at least two and the second contour image and the first contour image are obtained simultaneously; determining the particle size of the particles to be tested based on the sedimentation height, the sedimentation time and preset parameters.

[0051] It can be understood that the preset parameters are fixed parameters that are predetermined or set, and may include relevant parameters of the sedimentation medium and / or relevant parameters of the particles to be detected, wherein the sedimentation medium is the medium in the circulation pool.

[0052] Specifically, the processor can determine the sedimentation time of the particle to be measured based on the center coordinates of the second circumscribed circle corresponding to the second contour image obtained simultaneously with the first contour image. Specifically, the sedimentation time can be determined based on the correspondence between the difference between the center coordinates of the second circumscribed circles corresponding to the two second contour images and the time, and the particle size of the particle to be measured can be determined based on the sedimentation height, sedimentation time and preset parameters. For example, the particle size of the particle to be measured can be determined based on the preset relationship among the sedimentation height, sedimentation time and preset parameters.

[0053] In one embodiment, the preset parameters include the viscosity of the sedimentation medium, the specific gravity of the sedimentation medium, and the specific gravity of the particles to be measured; the particle size of the particles to be measured is determined according to the sedimentation height, the sedimentation time, and the preset parameters, including determining according to the following formula:

[0054]

[0055] Where r is the radius of the particle to be measured, η is the viscosity of the sedimentation medium, Yk is the specific gravity of the particle to be measured, Yt is the specific gravity of the sedimentation medium, H is the sedimentation height, t is the sedimentation time, and g is the gravitational acceleration.

[0056] It can be understood that the relevant parameters corresponding to the substances of different media are usually predetermined values. For example, in the embodiment of the present invention, the sedimentation medium is air, the viscosity and specific gravity of the air are fixed, and the specific gravity of the particles to be measured is also fixed. The sedimentation height can be determined based on the motion path of the captured particles, that is, the height of the particle sedimentation change captured by the first image acquisition device. The sedimentation time is the time taken for the particle path to change, which can be calculated by the interval of the captured images. Since the interval of image acquisition is known, the radius of the particle to be measured can be calculated by the sedimentation height, sedimentation time and preset parameters, and then the diameter can be calculated based on the radius, so that the particle size can be obtained. In some embodiments, the radius can also be used as the particle size of the particle.

[0057] Step S110: when the particle to be tested is a flake particle, the particle size of the particle to be tested is determined according to the appearance information.

[0058] Specifically, if the processor identifies the particle to be tested as a flake particle, the particle size of the particle to be tested can be determined based on the appearance information of the particle to be tested. For example, the specific shape of the particle to be tested can be determined based on the appearance information, and then the size of the particle to be tested can be determined based on the volume of the specific shape using the equivalent sphere method.

[0059] In one embodiment, the appearance information also includes a width ratio of an upper width to a lower width of a circumscribed quadrilateral corresponding to the first contour image; when the particle to be measured is a flaky particle, determining the particle size of the particle to be measured according to the appearance information includes: when the width ratio is within a second preset ratio range, determining that the flaky particle is a cylindrical flaky particle; determining the product of the area of ​​the second contour image and the height of the first contour image as the volume of the cylindrical flaky particle; and determining the diameter of a spherical particle having the same volume as the cylindrical flaky particle as the particle size of the particle to be measured.

[0060] It can be understood that the second preset ratio range is a preset reference range of the width ratio of the upper width to the lower width of the circumscribed quadrilateral corresponding to the first contour image. If the width ratio is within the second preset ratio range, for example, 0.8 to 1.2, it can be further determined that the flaky particles are cylindrical flaky particles. The second preset ratio range can be specifically set according to actual conditions. In some embodiments, the appearance information may also include the width ratio of the upper width to the lower width of the inscribed quadrilateral corresponding to the first contour image.

[0061] Specifically, the processor may compare the width ratio of the upper width and the lower width of the circumscribed quadrilateral corresponding to the first contour image with a second preset ratio range. If the width ratio is within the second preset ratio range, that is, the shape of the flaky particle is closer to a cylinder, then the flaky particle is judged to be a cylindrical flaky particle, and then the product value of the area of ​​the second contour image and the height of the first contour image is determined as the volume of the cylindrical flaky particle, and then the diameter of a spherical particle with the same volume as the cylindrical flaky particle is determined as the particle size (i.e., diameter) of the particle to be measured through the equivalent sphere method.

[0062] In one embodiment, when the particles to be tested are flaky particles, determining the particle size of the particles to be tested based on appearance information also includes: when the width ratio is not within a second preset ratio range, determining that the flaky particles are conical flaky particles; determining one third of the product of the area of ​​the second contour image and the height of the first contour image as the volume of the conical flaky particles; and determining the diameter of spherical particles having the same volume as the conical flaky particles as the particle size of the particles to be tested.

[0063] Specifically, the processor can compare the width ratio of the upper width and the lower width of the circumscribed quadrilateral corresponding to the first contour image with the second preset ratio range. If the width ratio is not within the second preset ratio range, that is, the shape of the flaky particle is closer to a cone, then the flaky particle is judged to be a conical flaky particle, and then one third of the product value of the area of ​​the second contour image and the height of the first contour image is determined as the volume of the conical flaky particle, and then the diameter of the spherical particle with the same volume as the conical flaky particle is determined as the particle size (i.e., diameter) of the particle to be measured through the equivalent sphere method.

[0064] The above method for determining the particle size of particles obtains an image of the particles to be tested entering the circulation pool collected by an image acquisition device, and processes the image to determine the sedimentation height and appearance information of the particles to be tested, and then identifies the particle type corresponding to the particles to be tested based on the appearance information. When the particles to be tested are spherical particles, the particle size of the particles to be tested is determined based on the sedimentation height. When the particles to be tested are flaky particles, the particle size of the particles to be tested is determined based on the appearance information. The above particle size determination method can be applied to particles of most shapes, and different particle size determination strategies are used for particles of different shapes and types, which improves the accuracy of particle size measurement and increases the particle size range of measurable materials. At the same time, it avoids the problem of inaccurate particle size calculation of flaky non-spherical particles in the prior art, improves the efficiency of detection while ensuring the accuracy, and speeds up the detection.

[0065] In one embodiment, when the particles to be tested are spherical particles, the particle size of the particles to be tested is determined according to the sedimentation height, including: when the particles to be tested are spherical particles, determining the first particle size of the particles to be tested according to the sedimentation height; determining the second particle size of the particles to be tested according to appearance information; and determining the average value of the first particle size and the second particle size as the particle size of the particles to be tested.

[0066] Specifically, for spherical particles, the processor can first determine the first particle size of the particles to be measured based on the sedimentation height, and the specific determination process can refer to the method provided in the previous embodiment, and then determine the second particle size of the particles to be measured based on the appearance information. The specific determination process can refer to the method provided in the previous embodiment, and the average value of the first particle size and the second particle size is determined as the particle size of the particles to be measured, thereby further improving the accuracy of particle size determination.

[0067] In one embodiment, before acquiring the image of the particles to be tested entering the circulation pool captured by the image acquisition device, the method further includes: performing preliminary screening on the multiple particles to be tested located on the vibration sifter by high-frequency vibration to separate the particles to be tested within at least two particle size ranges.

[0068] It can be understood that the vibration screener is used to perform preliminary screening of multiple particles to be tested by vibration, so as to separate the multiple particles to be tested.

[0069] Specifically, the processor can perform preliminary screening of multiple particles to be tested on the vibrating screener through high-frequency vibration, so that the multiple particles to be tested are separated in the horizontal direction. Through high-frequency vibration, the particle samples to be tested of different particle sizes are diffused from the center to the surrounding on the disc of the vibrating screener, and the particles with large particle sizes are diffused to the surrounding, thereby achieving preliminary screening of the particle size of the particle samples to be tested.

[0070] In one embodiment, the method for determining the particle size of particles further comprises: determining a particle size distribution curve and / or a particle size distribution data table according to the particle sizes of a plurality of particles to be measured, and displaying the same.

[0071] It is understandable that after obtaining the particle sizes of multiple particles to be tested, the processor can count the number and / or proportion of particles in each particle size range, thereby drawing a particle size distribution curve and / or a particle size distribution data table, and display it for the user to view.

[0072] In a specific embodiment, Figure 2 As shown, a flow chart of a method for determining the particle size of particles in a specific embodiment of the present invention is provided, which specifically includes the following steps:

[0073] Step S201, through high-frequency vibration, the sample to be tested is separated in the horizontal direction. The diameter D of the vibrating disk can be 10 to 30 cm. Through high-frequency vibration, the test samples of different particle sizes are diffused from the center to the surrounding on the disk, and the large particles are diffused to the surrounding, so as to achieve the initial screening of the sample particle size.

[0074] Further, Figure 3 The schematic diagram of the structure of the flow cell in one embodiment of the present invention is shown as follows: Figure 3 As shown, the sampling device sucks particles from the edge to the center of the vibrating disk and enters the circulation pool through the transmission tube (1). Compressed air or nitrogen is used as carrier gas in the transmission tube. The carrier gas refers to the gas that provides horizontal movement force for the particles. The particles enter the circulation pool continuously in small quantities. Microscopic cameras are distributed on the outside of the front (2) and bottom (3) of the circulation pool. The particles are located by shooting with the two cameras.

[0075] In some embodiments, the sample can be in a state of low moisture content so as not to aggregate and to be easily dispersed. Before using the instrument, the instrument should be turned on to blow out the air in the transmission tube and the flow cell with carrier gas, and replace the gas therein with uniform compressed air or nitrogen to obtain stable data.

[0076] From step S202 to step S205, the images captured by the two cameras are converted into digital picture information respectively, and the data is transmitted to the computer processing system (ie, the processor).

[0077] Step S206: According to Stokes' theorem, particles are classified during the sedimentation process according to the formula Where r is the particle radius (cm); η is the viscosity of the sedimentation medium; Yk is the particle specific gravity (g / cm 3 ); Yt is the specific gravity of the sedimentation medium (g / cm 3 ), H is the sedimentation height (cm), t is the sedimentation time (s), and g is the gravitational acceleration (e.g., 980 cm / s), so the particle size 1 can be calculated from the motion trajectory of the particles.

[0078] Step S207, the pixel extraction module extracts pixel points based on the front image and the bottom image, converts them into computer data, and compares the particle coordinates on the two images to locate the particles. Specifically, since the front image and the bottom image have the same coordinate axis, one of the multiple particles can be located according to the position of the same coordinate axis. Generally speaking, one image (i.e., one field of view) contains several to hundreds of particles, and the positioning can be completed at the same time.

[0079] Furthermore, the outer contour extraction module can perform binarization processing on the image information, extract the outer contour of the image, identify the shape of the particles, and for the flaky particles whose aspect ratio is not within the range of 0.8 to 1.2, the equivalent sphere method can be used to calculate the particle size 2. The particle size of the flaky particles is particle size 2, and the particle sizes of the remaining particles are output as particle size 1 (faster detection speed) or counted as the average of particle size 1 and particle size 2 (higher accuracy). It can be understood that particle size 1 and particle size 2 correspond to different particle size determination methods, which can correspond to the determination of the particle size of the particle to be measured according to the sedimentation height and the determination of the particle size of the particle to be measured according to the appearance information in the above-mentioned embodiment.

[0080] Step S208, after continuous tracking and calculation, the number of particles in each particle size range is counted and a distribution curve or a distribution data table is drawn.

[0081] In one embodiment, Figure 4 The following is a schematic diagram of a detection system for determining the particle size of a particle according to an embodiment of the present invention. Figure 4As shown, the detection system for determining the particle size may include a sample processing system, an image processing system and a display system. The sample processing system is used to preliminarily screen particles of different sizes to prevent large-sized particles and small-sized particles from entering the circulation pool at the same time, resulting in small-sized particles being ignored. The image processing system converts the optical image into a digital image, performs binarization processing, extracts the image contour for calculation, and the display system is used to display a distribution curve or a distribution data table.

[0082] An embodiment of the present invention provides a processor configured to execute the method for determining the particle size according to the above embodiment.

[0083] An embodiment of the present invention also provides a device for determining particle size, comprising: a circulation pool for providing an isolated environment for the particles to be tested; an image acquisition device for acquiring images of the particles to be tested entering the circulation pool; and a processor according to the above embodiment.

[0084] In one embodiment, the image acquisition device includes a first image acquisition device and a second image acquisition device, wherein the first image acquisition device and the second image acquisition device are respectively arranged on the front side and the bottom side outside the circulation pool, and are respectively used for image acquisition in the front direction and image acquisition in the bottom direction.

[0085] An embodiment of the present invention provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor executes the method for determining the particle size according to the above embodiment.

[0086] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0087] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0088] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0089] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0090] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0091] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0092] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0093] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0094] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for determining the particle size of a particle, characterized in that The method comprises: Acquire an image of the particles to be tested entering the circulation pool captured by an image acquisition device; Processing the image to determine the sedimentation height and appearance information of the particle to be tested; Identify the particle type corresponding to the particle to be tested according to the appearance information, wherein the particle type includes spherical particles and flake particles; In the case where the particles to be tested are spherical particles, determining the particle size of the particles to be tested according to the sedimentation height; In the case where the particles to be tested are flaky particles, determining the particle size of the particles to be tested according to the appearance information; The image acquisition device comprises a first image acquisition device and a second image acquisition device, wherein the first image acquisition device and the second image acquisition device are respectively arranged on the front side and the bottom side of the outside of the circulation pool, and are respectively used for image acquisition in the front direction and image acquisition in the bottom direction; the image comprises a first image acquired by the first image acquisition device and a second image acquired by the second image acquisition device; the image is processed to determine the sedimentation height and appearance information of the particle to be detected, comprising: Performing binarization processing on the first image and the second image respectively, so as to extract a first contour image of the particle to be detected on the first image and a second contour image on the second image; Determining the sedimentation height of the particle to be detected according to the center coordinates of a first circumscribed circle corresponding to the first contour image, wherein the number of the first contour images is at least two; Determining the aspect ratio of a first circumscribed rectangle corresponding to the first contour image and the aspect ratio of a second circumscribed rectangle corresponding to the second contour image to obtain appearance information of the particle to be detected; When the particles to be detected are spherical particles, determining the particle size of the particles to be detected according to the sedimentation height includes: Determining the sedimentation time of the particle to be detected according to the center coordinates of a second circumscribed circle corresponding to the second contour image, wherein the number of the second contour images is at least two and the second contour image and the first contour image are obtained simultaneously; The particle size of the particles to be measured is determined according to the sedimentation height, the sedimentation time and preset parameters.

2. The method according to claim 1, characterized in that The step of identifying the particle type corresponding to the particle to be detected according to the appearance information includes: Determine the particle to be tested whose length-to-width ratio of the first circumscribed rectangle and the length-to-width ratio of the second circumscribed rectangle are both within a first preset ratio range as the spherical particle; The particles to be detected whose length-to-width ratio of the first circumscribed rectangle and / or the length-to-width ratio of the second circumscribed rectangle are not within the first preset ratio range are determined as the flake particles.

3. The method according to claim 1, characterized in that: The preset parameters include the viscosity of the sedimentation medium, the specific gravity of the sedimentation medium and the specific gravity of the particles to be measured; the particle size of the particles to be measured is determined according to the sedimentation height, the sedimentation time and the preset parameters, including determining according to the following formula: Wherein, r is the radius of the particle to be measured, η is the viscosity of the sedimentation medium, Yk is the specific gravity of the particle to be measured, Yt is the specific gravity of the sedimentation medium, H is the sedimentation height, t is the sedimentation time, and g is the gravitational acceleration.

4. The method according to claim 1, characterized in that The appearance information further includes a width ratio of an upper width to a lower width of a circumscribed quadrilateral corresponding to the first contour image; when the particle to be detected is a flaky particle, determining the particle size of the particle to be detected according to the appearance information includes: When the width ratio is within a second preset ratio range, determining that the flaky particles are cylindrical flaky particles; Determine the product of the area of ​​the second contour image and the height of the first contour image as the volume of the cylindrical flake-like particle; Determine the diameter of the spherical particles having the same volume as the cylindrical flake particles as the particle size of the particles to be tested; Preferably, when the particles to be tested are flaky particles, determining the particle size of the particles to be tested according to the appearance information further comprises: When the width ratio is not within the second preset ratio range, determining that the flaky particles are conical flaky particles; determining one third of the product value of the area of ​​the second contour image and the height of the first contour image as the volume of the conical flake-shaped particle; The diameter of the spherical particles having the same volume as the conical flake particles is determined as the particle size of the particles to be measured.

5. The method according to any one of claims 1 to 4, characterized in that: When the particles to be detected are spherical particles, determining the particle size of the particles to be detected according to the sedimentation height includes: In the case where the particle to be detected is a spherical particle, determining a first particle size of the particle to be detected according to the sedimentation height; Determine a second particle size of the particle to be tested according to the appearance information; The average value of the first particle size and the second particle size is determined as the particle size of the particle to be measured.

6. A processor, characterized in that: The device is configured to perform the method for determining the particle size according to any one of claims 1 to 5.

7. A device for determining particle size, characterized in that include: A flow cell, used to provide an isolated environment for the particles to be tested; An image acquisition device, used for acquiring images of the particles to be tested entering the circulation pool; as well as The processor according to claim 6; Preferably, the image acquisition device includes a first image acquisition device and a second image acquisition device, wherein the first image acquisition device and the second image acquisition device are respectively arranged on the front side and the bottom side outside the circulation pool, and are respectively used for image acquisition in the front direction and image acquisition in the bottom direction.

8. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instruction is executed by a processor, the processor is caused to perform the method for determining the particle size according to any one of claims 1 to 5.

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