Particle size distribution detection device and particle size distribution detection method

Abstract

The invention provides a particle size distribution detection device, which comprises a first vibration sieve assembly, a second vibration sieve assembly, a third vibration sieve assembly and a fourth vibration sieve assembly, the first optical structure is used for emitting first laser to irradiate to-be-detected particles in the detection space to generate a first detection signal, and the first receiving disc is used for weighing the first mass of the to-be-detected particles; a second detection space is formed in the second vibrating screen assembly, and the second vibrating screen assembly is used for acquiring the second mass of part of the to-be-detected particles passing through the first screen and generating a second detection signal according to the part of the to-be-detected particles; and the controller is used for acquiring light intensity angle distribution of the first detection light according to the first detection signal, acquiring light intensity angle distribution of the second detection light according to the second detection signal, and acquiring particle size-volume distribution information of at least part of the to-be-detected particles based on a normal distribution curve according to the light intensity angle distribution, the first mass and the second mass. The invention further provides a particle size distribution detection method of the particles.

Description

Technical Field

[0001] The present application relates to the field of screening technology, and in particular to a particle size distribution detection device and a particle size distribution detection method for particles applied to the particle size distribution detection device. Background Art

[0002] The existing vibration screening technology can be used to roughly estimate the content ratio of particles of various particle sizes in a sample to be tested, but it is difficult to accurately obtain the distribution information of particles of different particle sizes. Summary of the invention

[0003] The first aspect of the present application provides a particle size distribution detection device, comprising: a first vibrating screen component, comprising a first main body, a first optical structure, a first tray and a first screen, the first main body encloses a first detection space, the first optical structure, the first tray and the first screen are located in the first detection space and connected to the first main body; the first optical structure is used to emit a first laser to irradiate the particles to be detected in the detection space, and is used to receive the first detection light scattered by the particles to be detected according to the first laser to generate a first detection signal, the first tray is used to weigh the first mass of the particles to be detected, and the screen is used to screen out part of the particles to be detected; a second vibrating screen component, forming a second detection space , the second vibrating screen assembly is arranged in sequence with the first vibrating screen assembly along a preset direction, the second vibrating screen assembly is used to obtain a second mass of a portion of the particles to be tested that pass through the first sieve, and is used to generate a second detection signal based on the portion of the particles to be tested; and a controller is electrically connected to the first optical structure, the first tray and the second vibrating screen assembly, respectively, the controller is used to obtain the light intensity angular distribution of the first detection light according to the first detection signal, and to obtain the light intensity angular distribution of the second detection light according to the second detection signal, and is also used to obtain the "particle size-volume" distribution information of at least a portion of the particles to be tested based on the normal distribution curve, according to the light intensity angular distribution, the first mass and the second mass.

[0004] According to a second aspect of the present application, there is provided a particle size distribution detection method for particles, which is applied to a particle size distribution detection device for particles, wherein the particle size distribution detection device comprises a first vibrating screen assembly and a second vibrating screen assembly arranged in sequence along a preset direction, wherein the first vibrating screen assembly forms a first detection space, and the second vibrating screen assembly forms a second detection space; the particle size distribution detection method comprises: controlling the particles to be detected to enter the first detection space; controlling the emission of a first laser and receiving a first detection signal generated by the particles to be detected according to the first detection light scattered by the first laser, obtaining the light intensity angular distribution of the first detection light according to the first detection signal, and weighing the first mass of the particles to be detected; controlling part of the particles to be detected to enter the second detection space, wherein the particle size of the part of the particles to be detected is smaller than the particle size of the remaining particles to be detected; emitting a second laser and receiving a second detection signal generated by the part of the particles to be detected according to the second detection light scattered by the second laser, obtaining the light intensity angular distribution of the second detection light according to the second detection signal, and weighing the second mass of the part of the particles to be detected; and obtaining the "particle size-volume" distribution information of at least part of the particles to be detected according to the light intensity angular distribution, the first mass and the second mass based on a normal distribution curve.

[0005] The above-mentioned particle size distribution detection device and particle size distribution detection method, the first vibrating screen component includes a first optical structure, a first plate receiver and a first sieve, the particles to be measured are optically detected by the first optical structure to obtain a first detection signal, the particles to be measured are weight detected by the first plate receiver to obtain a first mass, and then the particles to be measured are screened by the first sieve and the second vibrating screen component. Based on the normal distribution curve, according to the light intensity angle distribution, the first mass, and the second mass, the "particle size-volume" distribution information of at least part of the particles to be measured can be accurately obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 Schematic diagram of the structure of a particle size distribution detection device of an embodiment of the present application.

[0007] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the first vibrating screen assembly, the second vibrating screen assembly and the third vibrating screen assembly along the II-II line.

[0008] Figure 3 Schematic diagram of the process flow of the particle size distribution detection method of the embodiment of the present application.

[0009] Figure 4 is the correspondence between the angle and intensity of the detected light.

[0010] Figure 5It is a schematic diagram of the “particle size-volume” distribution curve of all particles to be tested obtained based on the first sieve vibration assembly.

[0011] Figure 6 It is a schematic diagram of the “particle size-volume” distribution curve of some particles to be tested obtained based on the second sieve vibration assembly.

[0012] Figure 7 It is a schematic diagram of the “particle size-volume” distribution curve of some particles to be tested obtained based on the third sieve vibration assembly.

[0013] Figure 8 It is a schematic diagram of the “particle size-volume” distribution curve of the particles to be tested whose particle size is within the target particle size range obtained by controller fitting.

[0014] Main component symbols Particle size distribution detection device: 100; second sieve: 24; first vibration screen assembly: 10; third sieve layer: 241; first body: 11; third mesh: 2411; first detection space: 111; fourth sieve layer: 242; first optical structure: 12; fourth mesh: 2421; first light-emitting element: 121; second funnel structure: 25; first detection element: 122; second funnel: 251; first tray: 13; second closure: 252; first sieve: 14; third vibration screen assembly: 30; first sieve layer: 141; third body: 31; first mesh: 1411; third detection space: 311; second sieve layer: 142; third optical structure: 32; second Mesh: 1421; third light-emitting element: 321; first funnel structure: 15; third detection element: 322; first funnel: 151; third dish receiver: 33; first opening: 1511; third screen: 34; first closure: 152; fifth screen layer: 341; second vibrating screen assembly: 20; fifth mesh: 3411; second body: 21; sixth screen layer: 342; second detection space: 211; sixth mesh: 3421; second optical structure: 22; third funnel structure: 35; second light-emitting element: 221; third funnel: 351; second detection element: 222; third closure: 352; second dish receiver: 23; steps: S1, S2, S3, S4, S5.

[0015] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0016] The present application provides a particle size distribution detection device and a particle size distribution detection method for the particle size distribution detection device, which are used to detect the particle size distribution of the particles to be detected. The particle size distribution detection device includes a vibrating sieve assembly, which screens and optically detects the particles to be detected through a sieve and an optical structure, which is conducive to accurately obtaining the "particle size-volume" distribution information of at least part of the particles to be detected.

[0017] See also Figure 1 The particle size distribution detection device 100 of the embodiment of the present application can be used to detect the particle size distribution of the particles 200 to be detected whose particle size is less than 1000 μm (e.g., tens to hundreds of microns). The particle size distribution detection device 100 is used to detect the particle size distribution of the particles 200 to be detected, and further obtain the "particle size-volume" distribution information of the particles 200 to be detected whose particle size range is within at least one target particle size range.

[0018] The particle size distribution detection device 100 includes a first vibrating screen assembly 10, a second vibrating screen assembly 20, a third vibrating screen assembly 30 and a controller 40. The first vibrating screen assembly 10, the second vibrating screen assembly 20, and the third vibrating screen assembly 30 are arranged from top to bottom (with Figure 1 The first vibrating screen assembly 10, the second vibrating screen assembly 20 and the third vibrating screen assembly 30 are arranged in sequence in the direction of (with the first vibrating screen assembly 10 as the reference), and any two adjacent ones are detachably connected. The controller 40 is respectively connected to the first vibrating screen assembly 10, the second vibrating screen assembly 20 and the third vibrating screen assembly 30.

[0019] During the operation of the particle size distribution detection device 100, the particles to be detected 200 are controlled to pass through the first vibrating screen assembly 10, the second vibrating screen assembly 20 and the third vibrating screen assembly 30 in sequence, so as to sequentially perform optical detection, weight detection and particle size screening on at least part of the particles to be detected 200. The controller 40 is used to control the operation of the first vibrating screen assembly 10, the second vibrating screen assembly 20 and the third vibrating screen assembly 30, and is used to process and calculate the signals output during the operation of the first vibrating screen assembly 10, the second vibrating screen assembly 20 and the third vibrating screen assembly 30, so as to obtain the "particle size-volume" distribution information of the particles to be detected 200. The controller 40 includes, for example, a terminal device such as a computer.

[0020] In this embodiment, the particle size distribution detection device 100 includes three layers of vibrating screen components (first vibrating screen component 10, second vibrating screen component 20, third vibrating screen component 30) as an example to illustrate the structure and function of the particle size distribution detection device 100. In other embodiments of the present application, the particle size distribution detection device 100 may include fewer or more vibrating screen components. In other embodiments of the present application, the vibrating screen components may also be stacked in sequence and fixedly connected.

[0021] See also Figure 2The first vibration screen assembly 10 includes a first body 11, a first optical structure 12, a first tray receiver 13 and a first screen 14. The first body 11 encloses a first detection space 111, and the first optical structure 12, the first tray receiver 13 and the first screen 14 are located in the first detection space 111 and connected to the inner wall of the first body 11. When the particles 200 to be detected enter the first detection space 111, the first optical structure 12 is used to perform optical detection on the particles 200 to be detected, the first tray receiver 13 is used to perform weight detection on the particles 200 to be detected, and the first screen 14 is used to perform particle size screening on the particles 200 to be detected.

[0022] In this embodiment, the first optical structure 12, the first tray receiver 13 and the first screen 14 are arranged in sequence from top to bottom and are spaced apart from each other. That is, the first tray receiver 13 is located between the first optical structure 12 and the first screen 14, and the first screen 14 is closer to the second vibrating screen assembly 20 than the first optical structure 12. In this way, the particles 200 to be tested entering the first detection space 111 are first optically detected by the first optical structure 12, then weight detected by the first tray receiver 13, and finally particle size screened by the first screen 14.

[0023] The present application does not limit the order of optical detection and weight detection. In other embodiments of the present application, the positional relationship between the first optical structure 12 and the first tray receiver 13 can be interchanged. That is, in other embodiments of the present application, the first optical structure 12 can be located between the first tray receiver 13 and the first screen 14, and the particles 200 to be detected entering the first detection space 111 are firstly subjected to weight detection by the first tray receiver 13, then optically detected by the first optical structure 12, and finally subjected to particle size screening by the first screen 14.

[0024] The first optical structure 12 includes a plurality of first light-emitting elements 121 and a plurality of first detection elements 122. The first light-emitting elements 121 are arranged at intervals on the inner wall of the first body 11, and the first detection elements 122 are also arranged at intervals on the inner wall of the first body 11. In this embodiment, the plurality of first light-emitting elements 121 are arranged in a plurality of rows parallel to each other, and the first light-emitting elements 121 in the same row are arranged at intervals on the inner wall of the first body 11 in the circumferential direction. The first detection elements 122 are also arranged in a plurality of rows parallel to each other, and the first detection elements 122 in the same row are also arranged at intervals on the inner wall of the first body 11 in the circumferential direction. One row of the first light-emitting elements 121 and one row of the first detection elements 122 are arranged alternately in the arrangement direction of each vibrating screen assembly.

[0025] The first light-emitting element 121 is a light-emitting diode, which is used to emit a first laser toward the center of the first detection space 111. When the particle 200 to be detected enters the first detection space 111, the first laser irradiated to the surface of the particle 200 to be detected is scattered by the particle 200 to be detected as the first detection light. The first detection element 122 is a photodiode, which is used to receive the first detection light and generate a corresponding first detection signal (electrical signal) and then output it. The controller 40 is used to receive the first detection signal output by each first detection element 122. The amplitude of the first detection signal generated by each first detection element 122 can reflect the light intensity of the first detection light at the point where the first detection element 122 is located. The controller 40 can obtain the angular distribution of the first detection light by analyzing the amplitude of the first detection signal output by all the first detection elements 122. The working process of the first light-emitting element 121 and the first detection element 122 is the aforementioned "optical detection" process.

[0026] The above arrangement of the first light emitting element 121 and the first detection element 122 is conducive to projecting the first laser to any position and angle in the first detection space 111, and is also conducive to receiving the first detection light from any position and angle in the first detection space 111. In at least one embodiment of the present application, the above first laser and the first detection light can be blue light or red light.

[0027] The first tray receiver 13 is a disc-shaped structure that adapts to the shape of the first detection space 111. Through the built-in weighing electronic components (not shown), it can be realized that after all the particles 200 to be tested fall into the first tray receiver 13, all the particles 200 to be tested are weighed to output the first mass. In at least one embodiment of the present application, the first tray receiver 13 can be controlled by the controller 40 to be in a closed state and an open state. When the first tray receiver 13 is in a closed state, it is used to receive and weigh the particles 200 to be tested after optical detection. When the first tray receiver 13 is in an open state, it is used to pour the weighed particles 200 to be tested into the first sieve 14 of the lower layer. The controller 40 controls the first tray receiver 13 to remain in a closed state during the optical detection process, and controls the first tray receiver 13 to switch to an open state after all the particles 200 to be tested have completed optical detection and fallen into the first tray receiver 13 and weighing is completed.

[0028] In this embodiment, the first screen 14 includes a first screen layer 141 and a second screen layer 142 which are stacked in sequence. The first screen layer 141 and the second screen layer 142 respectively have a circular outer contour adapted to the shape of the first detection space 111. The first screen layer 141 is formed with a plurality of densely arranged first mesh holes 1411 with equal apertures (considered equal within an acceptable error range), and the second screen layer 142 is formed with a plurality of densely arranged second mesh holes 1421 with equal apertures (considered equal within an acceptable error range), and the aperture of the first mesh hole 1411 is larger than the aperture of the second mesh hole 1421. In the embodiment of the present application, in the first screen layer 141 and the second screen layer 142, except for the mesh holes located in the edge area, the remaining first mesh holes 1411 and the second mesh holes 1421 are all roughly rectangular.

[0029] In this embodiment, the first vibrating screen assembly 10 further includes a first driving mechanism (not shown) electrically connected to the controller 40. The first driving mechanism is electrically connected to and controlled by the controller 40, and is used to drive the first screen layer 141 and the second screen layer 142 to move, so as to switch different screen layers (the first screen layer 141 or the second screen layer 142) to the movement path of the particles 200 to be tested at different times.

[0030] In at least one embodiment of the present application, the first driving mechanism can be used to drive the first mesh layer 141 and the second mesh layer 142 to rotate, so that one of the first mesh layer 141 and the second mesh layer 142 is rotated into the first detection space 111 and is located on the falling path of the particles 200 to be detected, and the other is rotated out of the first detection space 111. In at least one embodiment of the present application, the first driving mechanism can also be used to drive the first mesh layer 141 and the second mesh layer 142 to expand or retract. For example, the first mesh layer 141 is driven to expand to be located on the falling path of the particles 200 to be detected, and the second mesh layer 142 is driven to retract and be close to the inner wall of the first body 11 to avoid the falling particles 200 to be detected.

[0031] In this embodiment, in order to fully demonstrate the structure of the first screen 14, Figure 2 The figure shows a state where both the first sieve layer 141 and the second sieve layer 142 are located in the first detection space 111. During the actual operation of the particle size distribution detection device 100, only one sieve layer is located on the falling path of the particles 200 to be detected at the same time.

[0032] In this embodiment, the controller 40 controls the first driving mechanism to drive a sieve layer whose mesh aperture is closer to and greater than or equal to the larger boundary value D2 of the target particle size range to the movement path of the particles 200 to be tested according to the preset target particle size range D1-D2. For example, the aperture of the first mesh 1411 is N11 (for example, 125 μm), and the aperture of the second mesh 1421 is N12 (for example, 106 μm). If N11>N12≥D2, it can be seen that the aperture N12 of the second mesh 1421 of the second screen layer 142 is larger than the larger boundary value D2 of the target particle size range, and is closer to the larger boundary value D2 than the aperture N11 of the first mesh 1411. At this time, the controller 40 controls the first driving mechanism to drive the second screen layer 142 to the movement path of the particles 200 to be tested, so as to screen out some of the particles 200 to be tested whose particle size is smaller than N2 and continue to fall into the second vibrating screen assembly 20, while some of the particles 200 to be tested whose particle size is larger than N2 stay on the second screen layer 142 and do not continue to participate in subsequent detection.

[0033] In other embodiments of the present application, the first screen 14 may include only a single screen layer or more screen layers. In the embodiment where the first screen 14 includes more screen layers, the mesh apertures of each screen layer are different. In other embodiments of the present application, the mesh apertures may be other shapes.

[0034] In this embodiment, the first vibrating screen assembly 10 further includes a first funnel structure 15 connected to the first body 11. The first funnel structure 15 is located on the side of the first optical structure 12 away from the first screen 14. The first funnel structure 15 includes a first funnel 151 and a first closure member 152. The first funnel 151 has a first opening 1511 facing the first tray receiver 13, and the first closure member 152 is connected to the first opening 1511 of the first funnel 151 in an openable and closable manner.

[0035] The first funnel 151 is used to temporarily store the particles 200 to be detected before optical detection. The first closing member 152 is controlled by the controller 40 and is used to close or open the first opening 1511. When the first closing member 152 closes the first opening 1511, the particles 200 to be detected in the first funnel 151 are blocked from entering the first detection space 111. When the first closing member 152 opens the first opening 1511, the particles 200 to be detected in the first funnel 151 fall into the first detection space 111 under the action of gravity. In this embodiment, the first closing member 152 is controlled by the controller 40 and is also used to control the degree of opening of the first opening 1511 to adjust the speed at which the particles 200 to be detected enter the first detection space 111. When the speed at which the particles 200 to be detected enter the first detection space 111 is low, the optical detection time is long, but it is conducive to improving the detection accuracy. When the speed at which the particles 200 to be detected enter the first detection space 111 is high, the optical detection speed is fast. The controller 40 can adjust the speed at which the particles 200 to be detected enter the first detection space 111 according to one or any combination of the particle size of the particles 200 to be detected, the wavelength of the first laser, the power of the first laser, the parameters of the first detection element 132 , etc.

[0036] The second vibrating screen assembly 20 includes a second body 21, a second optical structure 22, a second tray receiver 23, a second screen 24 and a second funnel structure 25. The second body 21 forms a cylindrical second detection space 211. The second optical structure 22 includes a plurality of second light-emitting elements 221 and a plurality of second detection elements 222. The second funnel structure 25 includes a second funnel 251 and a second closure 252. The second optical structure 22, the second tray receiver 23 and the second funnel structure 25 are substantially the same in structure and function as the first optical structure 12, the first tray receiver 13 and the first funnel structure 15.

[0037] The second screen 24 includes a third screen layer 241 and a fourth screen layer 242. The third screen layer 241 is formed with a plurality of third mesh holes 2411, and the fourth screen layer 242 is formed with a plurality of fourth mesh holes 2421. The apertures of the third mesh holes 2411, the fourth mesh holes 2421, the first mesh holes 1411, and the second mesh holes 1421 are different from each other. The second vibrating screen assembly 20 also includes a second driving mechanism (not shown) that drives the third screen layer 241 and the fourth screen layer 242 to move.

[0038] The second vibrating screen assembly 20 performs optical detection on the particles 200 entering the second detection space 211 through the second optical structure 22 to output a second detection signal. The second tray receiver 23 is used to weigh the particles 200 after optical detection by the second optical structure 22 to output a second mass.

[0039] The third vibrating screen assembly 30 includes a third body 31, a third optical structure 32, a third dish receiver 33, a third screen 34 and a third funnel structure 35. The third body 31 forms a cylindrical third detection space 311. The third optical structure 32 includes a plurality of third light-emitting elements 321 and a plurality of third detection elements 322. The third funnel structure 35 includes a third funnel 351 and a third closure member 352. The structure and function of the third optical structure 32, the third dish receiver 33 and the third funnel structure 35 are substantially the same as those of the first optical structure 12, the first dish receiver 13 and the first funnel structure 15.

[0040] The third screen 34 includes a fifth screen layer 341 and a sixth screen layer 342. The fifth screen layer 341 is formed with a plurality of fifth meshes 3411, and the sixth screen layer 342 is formed with a plurality of sixth meshes 3421. The apertures of the fifth mesh 3411, the sixth mesh 3421, the first mesh 1411, the second mesh 1421, the third mesh 2411, and the fourth mesh 2421 are different from each other. The third vibrating screen assembly 30 also includes a third driving mechanism (not shown) for driving the fifth screen layer 341 and the sixth screen layer 342 to move. In this embodiment, the controller 40 controls the second driving mechanism to drive a screen layer whose mesh aperture is closer to the smaller boundary value D1 of the target particle size range and is less than or equal to the smaller boundary value to the movement path of the particles 200 to be tested according to the preset target particle size range D1-D2.

[0041] The third vibrating screen assembly 30 performs optical detection on the particles 200 to be detected entering the third detection space 311 through the third optical structure 32 to output a third detection signal. The third tray receiver 33 is used to weigh the particles 200 to be detected after optical detection by the third optical structure 32 to output a third mass. In other embodiments of the present application, the vibrating screen assembly at the bottom layer (such as the third vibrating screen assembly 30 in this embodiment) may not include a screen.

[0042] In this embodiment, the controller 40 is electrically connected to the first light-emitting element 121, the first detection element 122, the first tray receiver 13, the first driving mechanism, the first closing member 152, the second light-emitting element 221, the second detection element 222, the second tray receiver 23, the second driving mechanism, the second closing member 252, the third light-emitting element 321, the third detection element 322, the third tray receiver 33, the third driving mechanism and the third closing member 352.

[0043] The controller 40 is used to obtain the light intensity angular distribution of the first detection light according to the first detection signal, obtain the light intensity angular distribution of the second detection light according to the second detection signal, and obtain the light intensity angular distribution of the third detection light according to the third detection signal. It is also used to obtain the "particle size-volume" distribution information of some of the particles 200 to be tested whose particle size is within the target particle size range based on the normal distribution curve, according to the above-mentioned light intensity angular distribution and the first mass, second mass, and third mass outputted sequentially by the first vibrating screen component 10, the second vibrating screen component 20 and the third vibrating screen component 30.

[0044] In at least one modified embodiment of the present application, when one of the boundary values ​​of the preset particle size range is close to the peak value of the particle size range of all particles 200 to be tested in a sample to be tested, the particle size distribution detection device 100 can accurately obtain the "particle size-volume" distribution information of the particles to be tested within the preset particle size range through the first vibrating screen component 10 and the second vibrating screen component 20. In this modified embodiment, the controller 40 is used to obtain the light intensity angular distribution of the first detection light according to the first detection signal, obtain the light intensity angular distribution of the second detection light according to the second detection signal, and is also used to obtain the "particle size-volume" distribution information of some particles 200 to be tested whose particle size is within the target particle size range in the particles 200 to be tested based on the normal distribution curve, according to the above-mentioned light intensity angular distribution, the first mass and the second mass.

[0045] The present application also provides a particle size distribution detection method, which is applied to a particle size distribution detection device 100. The working process of the particle size distribution detection device 100 of the present application embodiment is described below in conjunction with the particle size distribution detection method.

[0046] See also Figure 3 , the particle size distribution detection method of the particles includes: Step S1, controlling the particles to be detected to enter the first detection space; Step S2, controlling the emission of a first laser and receiving a first detection light scattered by the particle to be measured according to the first laser to generate a first detection signal, acquiring the light intensity angular distribution of the first detection light according to the first detection signal, and weighing a first mass of the particle to be measured; Step S3, controlling part of the particles to be detected to enter the second detection space, wherein the particle size of the part of the particles to be detected is smaller than the particle size of the remaining particles to be detected; Step S4, emitting a second laser and receiving a second detection light scattered by the part of the particles to be measured according to the second laser to generate a second detection signal, acquiring the light intensity angular distribution of the second detection light according to the second detection signal, and weighing the second mass of the part of the particles to be measured; and Step S5, based on a normal distribution curve, according to the light intensity angle distribution, the first mass, and the second mass, obtaining “particle size-volume” distribution information of at least part of the particles to be measured.

[0047] During the use of the particle size distribution detection device 100, according to Figure 1 The orientation shown is placed on a working plane (e.g., the ground, a desktop). In step S1, the particles 200 to be tested are temporarily stored in the first funnel 151 of the first vibrating screen assembly 10. The controller 40 controls the first closure member 152 to keep the first opening 1511 of the first funnel 151 completely closed to prevent the particles 200 to be tested from falling into the first detection space 111.

[0048] In step S2, the detection process starts, and the controller 40 controls the first closure member 152 to open the first opening 1511 and maintain the first opening 1511 at a specific opening degree according to a preset speed, so that the speed at which the particles 200 to be detected enter the first detection space 111 during the entire optical detection process is substantially constant. At the same time, the controller 40 drives each of the first light-emitting elements 121 to emit the first laser. The particles 200 to be detected that enter the first detection space 111 scatter the first detection light when irradiated by the first laser. The controller 40 continuously receives the first detection signal generated by each of the first detection elements 122 according to the received first detection light.

[0049] In step S2, the particles 200 to be tested after optical detection fall onto the first tray receiver 13 one after another. When all the particles 200 to be tested fall onto the first tray receiver 13, the first tray receiver 13 weighs all the particles to be tested to obtain the total mass of the particles 200 to be tested, that is, the first mass mentioned above. The controller 40 controls the first driving mechanism to drive the first mesh layer 141 or the second mesh layer 142 in the first mesh 14 to the path of the particles 200 to be tested, and after the weighing of the first tray receiver 13 is completed, the controller 40 controls the first tray receiver 13 to open, so that the particles 200 to be tested in the first tray receiver 13 continue to fall into the corresponding mesh layer of the first mesh 14.

[0050] In step S3 , part of the particles 200 to be tested are screened out by the first sieve 14 and continue to fall into the second funnel 251 of the second vibrating screen assembly 20 for pre-storage, and the rest of the particles 200 to be tested remain on the first sieve 14 .

[0051] In step S4, the controller 40 controls the second vibrating screen assembly 20 to perform optical detection and weight detection on the particles to be tested 200 falling into the second funnel 251 in turn, and obtain a second detection signal and a second weight. For details, refer to step S2. After the particles to be tested 200 in the second funnel 251 are optically detected and weight-detected by the second vibrating screen assembly 20, part of them are screened out by the second screen 24 and fall into the third funnel 351 of the third vibrating screen assembly 30, and the rest remain on the second screen 14. The particles to be tested 200 falling into the third funnel 351 are optically detected and weight-detected by the third vibrating screen assembly 30, and a third detection signal and a third weight are obtained. For details, refer to step S2.

[0052] The optical detection process of each of the aforementioned vibration screening components adopts the laser diffraction method, which adopts the volume equivalent sphere method, and the particles 200 to be tested use air as the dispersion medium. The detection signal intensity obtained by the detection element based on the detection light scattered by the particles 200 to be tested can reflect the intensity of the detection light, and the detection signals generated by all detection elements can be used to reflect the angular distribution of the detection light. The intensity and angular distribution of the detection light are related to the particle size of the particles 200 to be tested. The larger the particle size of the particles 200 to be tested, the smaller the scattering angle of the detection light and the greater the intensity; the smaller the particle size of the particles 200 to be tested, the larger the scattering angle of the detection light and the smaller the intensity. Therefore, according to the detection signals output by each detection element in the optical detection process, the following can be obtained: Figure 4 The corresponding relationship between the angle and intensity of the detection light shown. According to the "Mie scattering theory", the intensity of the scattered light (i.e., the aforementioned detection light) is proportional to the sixth power of the particle size of the particle 200 to be detected, inversely proportional to the fourth power of the wavelength of the laser, and is related to the refractive index and absorptivity of the particle 200 to be detected, and is related to the refractive index of the dispersion medium (air in this application).

[0053] According to the above inference, in step S5, the controller 40 combines the normal distribution formula , the simulated particle size distribution formula fd(X) and equivalent volume fraction fV(X) are: .

[0054] The simulated fd(X) and fV(X) are non-standard normal distribution curves, where μ, σ, and K are unknowns, and K is related to the particle size distribution and volume share distribution of the measured 200. In the embodiment of the present application, three equations are established through three vibration sieve particle size distributions and volume share distributions to solve the above three unknowns, thereby finally obtaining the particle size distribution formula fd(X).

[0055] For the first vibrating screen assembly 10, the first optical structure 12 performs optical detection on all the particles 200 to be tested, and the overall volume distribution V1 of all the particles 200 to be tested can be obtained. The first tray receiver 13 weighs all the particles 200 to be tested, and the first mass M1 of all the particles 200 to be tested can be obtained. The particle size of all the particles 200 to be tested is d min -d max between.

[0056] For the second vibrating screen assembly 20, the second optical structure 22 performs optical detection on the particles 200 to be tested entering the second funnel 251, and the overall volume distribution V2 of the particles 200 to be tested entering the second funnel 251 can be obtained. The second tray receiver 23 weighs the particles 200 to be tested entering the second funnel 251, and the second mass M2 of the particles 200 to be tested entering the second funnel 251 can be obtained. The particle size of the particles 200 to be tested entering the second funnel 251 is smaller than the mesh size of the corresponding mesh layer in the first mesh 14 (hereinafter referred to as d1).

[0057] For the third vibrating screen assembly 30, the third optical structure 32 performs optical detection on the particles to be tested 200 entering the third funnel 351, and the overall volume distribution V3 of the particles to be tested 200 entering the third funnel 351 can be obtained. The third tray receiver 33 weighs the particles to be tested 200 entering the third funnel 351, and the third mass M3 of the particles to be tested 200 entering the third funnel 351 can be obtained. The particle size of the particles to be tested 200 entering the third funnel 351 is smaller than the mesh size of the corresponding mesh layer in the second mesh 24 (hereinafter referred to as d2).

[0058] Therefore, after the detection of the first vibrating screen assembly 10, the second vibrating screen assembly 20 and the third vibrating screen assembly 30, the controller 40 can establish the following equation: (1) (2) (3) In this embodiment, by selecting a screen layer that matches the larger value of the target particle size range in the first vibrating screen component 10, and selecting a screen layer that matches the smaller value of the target particle size range in the second vibrating screen component 20, the particles to be tested that remain in the second vibrating screen component 20 but do not enter the third vibrating screen component 30 are the particles to be tested whose particle size is within the target particle size range. Therefore, the distribution of the particles to be tested whose particle size is within the target particle size range can be obtained: (4) In other embodiments of the present application, when the particle size distribution detection device 100 includes more vibrating sieve components, the equations shown in Table 1 and Table 2 below can be obtained: Table 1 Table 2 Thus, the distribution of the particles to be tested within any target particle size range can be obtained: , where n ≥ 1 and is a positive integer.

[0059] As an example, in at least one embodiment of the present application, the particle size range of all particles 200 to be tested in a sample is 1-1000 μm, and the target particle size range received by the controller 40 is 20-40 μm. That is, in at least one embodiment, the "particle size-volume" distribution of some particles to be tested in the sample to be tested with a particle size range of 20-40 μm is mainly concerned.

[0060] All particles 200 to be tested are first optically tested and weight tested by the first vibrating screen assembly 10, and the results are as follows: Figure 5 The overall "particle size-volume" normal distribution image is shown. Figure 5 It can be seen that Figure 5 The distribution of the particles 200 to be tested with a particle size near the peak can be clearly seen, but the volume of the particles to be tested in the target particle size range that is far from the peak is almost close to 0. It can be seen that the accuracy of the analysis result based only on the detection result of the first vibration screening component 10 is low, and the farther the target particle size deviates from the peak, the greater the error in the result.

[0061] After the first vibrating screen assembly 10 performs optical detection and weight detection, a screen layer with a mesh size closest to the larger boundary value (i.e., 40 μm) of the target particle size range of 20-40 μm and greater than or equal to the larger boundary value is selected to screen the particles 200 to be tested. For example, if a screen layer with a mesh size of 40 μm is selected to screen the particles 200 to be tested, then among the particles 200 to be tested, the particles 200 to be tested with a particle size less than 40 μm fall from the first vibrating screen assembly 10 into the second vibrating screen assembly 20, while the particles 200 to be tested with a particle size greater than 40 μm remain on the screen layer.

[0062] The second vibrating screen assembly 20 continues to perform optical detection and weight detection on the particles 200 with a particle size less than 40 μm, and the following can be obtained: Figure 6The "particle size-volume" distribution image shown. A screen layer with a mesh size in the second vibrating screen assembly 20 that is closest to the smaller boundary value (i.e., 20 μm) of the target particle size range of 20-40 μm and less than or equal to the smaller boundary value is selected to perform a second screening on the particles 200 to be tested. For example, a screen layer with a mesh size of 20 μm is selected to perform a second screening on the particles 200 to be tested that enter the second vibrating screen assembly 20. Among the particles 200 to be tested, the particles 200 to be tested with a particle size less than 20 μm fall from the second vibrating screen assembly 20 into the third vibrating screen assembly 30, while the particles 200 to be tested with a particle size greater than 40 μm and less than 40 μm remain on the screen layer.

[0063] Laser scanning of the particles 200 with a particle size of less than 40 μm can greatly increase the target particle size content in the simulated normal distribution curve, and the accuracy of the data read out is greatly increased. Figure 7 The particle size distribution curve below 20 μm (laser scanning result of the third vibration sieve assembly 30) can be used to derive a simulated normal curve of the particle size distribution of the particles 200 to be tested with a particle size between 20 and 40 μm, such as Figure 8 As shown (also referred to in this application as "particle size-volume" distribution information), the accuracy of calculating the particle size volume distribution is greatly improved.

[0064] In other embodiments of the present application, the particle size distribution detection device 100 may include a greater number of vibrating sieve assemblies. In such other embodiments, the particle size distribution detection device 100 may calculate and obtain the "particle size-volume" distribution information of a greater number of particles 200 to be tested within a target particle size range.

[0065] For example, in at least one embodiment of the present application, the particle size distribution detection device 100 includes n vibrating sieve components, and the particle size distribution detection device 100 obtains the "particle size-volume" distribution information of the particle size 200 to be measured within the first target particle size range through the 1st to 3rd (numbered in sequence from top to bottom) vibrating sieve components, and then obtains the "particle size-volume" distribution information of the particle size 200 to be measured within the second target particle size range through the 4th to 6th vibrating sieve components... and then obtains the "particle size-volume" distribution information of the particle size 200 to be measured within the nth target particle size range through the (n-2)-nth vibrating sieve components. That is, the n vibrating sieve components are divided into a plurality of groups of vibrating sieve components arranged in sequence from top to bottom, and each group of vibrating sieve components sequentially obtains the "particle size-volume" distribution information of the particles to be measured within different target particle size ranges.

[0066] The above-mentioned particle size distribution detection device 100 and particle size distribution detection method, the first vibrating screen component 10 includes a first optical structure 12, a first plate receiver 13 and a first sieve 14, the particles to be measured 200 are optically detected by the first optical structure 12 to obtain a first detection signal, the particles to be measured 200 are weight detected by the first plate receiver 13 to obtain a first mass, and then the particles to be measured 200 are screened by the first sieve 14 and the second vibrating screen component 20. Based on the normal distribution curve, according to the light intensity angle distribution, the first mass, and the second mass, the "particle size-volume" distribution information of at least part of the particles to be measured 200 can be accurately obtained.

[0067] Furthermore, by setting up a multi-layer vibrating sieve assembly, based on the normal distribution curve, the "particle size-volume" distribution curve of some of the particles 200 to be tested whose particle sizes are within the target particle size range can be accurately fitted.

[0068] In addition, by setting up multiple layers of sieves in a single vibrating screen assembly, a layer of sieves with the most appropriate mesh size can be selected through the program according to the target particle size range input in real time and placed on the movement path of the particles 200 to be tested, so as to accurately fit the "particle size-volume" distribution curve of some particles 200 to be tested whose particle sizes are within the target particle size range.

[0069] Furthermore, by increasing the number of vibration screening assembly layers, the "particle size-volume" distribution curves of some particles to be tested 200 with particle sizes within multiple target particle size ranges can be obtained successively through a single detection by the particle size distribution detection device 100 of a single particle.

[0070] Those skilled in the art should recognize that the above implementation modes are only used to illustrate the present application, and are not used as limitations on the present application. As long as they are within the essential spirit of the present application, appropriate changes and modifications made to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A particle size distribution detection device, characterized in that: include: A first vibrating screen assembly comprises a first body, a first optical structure, a first plate receiver and a first screen, wherein the first body encloses a first detection space, and the first optical structure, the first plate receiver and the first screen are located in the first detection space and connected to the first body; The first optical structure is used to emit a first laser to illuminate the particles to be detected in the detection space, and to receive a first detection light scattered by the particles to be detected according to the first laser to generate a first detection signal, the first tray receiver is used to weigh the first mass of the particles to be detected, and the sieve is used to screen out part of the particles to be detected; A second vibrating screen assembly is formed with a second detection space, the second vibrating screen assembly and the first vibrating screen assembly are sequentially arranged along a preset direction, the second vibrating screen assembly is used to obtain a second mass of a portion of the particles to be detected that pass through the first sieve, and is used to generate a second detection signal according to the portion of the particles to be detected; as well as A controller is electrically connected to the first optical structure, the first plate receiver and the second vibrating screen assembly, respectively. The controller is used to obtain the light intensity angular distribution of the first detection light according to the first detection signal, and to obtain the light intensity angular distribution of the second detection light according to the second detection signal. The controller is also used to obtain the "particle size-volume" distribution information of at least part of the particles to be measured based on a normal distribution curve, the light intensity angular distribution, the first mass and the second mass.

2. The particle size distribution detection device of particles according to claim 1, characterized in that: The first optical structure includes a plurality of first light-emitting elements and a plurality of first detection elements, and the plurality of first light-emitting elements and the plurality of first detection elements are arranged alternately on the inner wall of the first body; The controller is electrically connected to the multiple first light-emitting elements and the multiple first detection elements, respectively. The controller is used to drive the multiple first light-emitting elements to emit the first laser when the particles to be detected enter the first detection space, and is used to receive the first detection signals generated by the multiple first detection elements sensing the first detection light.

3. The particle size distribution detection device of claim 1, characterized in that: The first tray adapter is located between the first optical structure and the first screen; The controller is used to control the first tray receiver to close so as to weigh the particles to be measured after passing through the first optical structure, and is used to control the first tray receiver to open after the weighing is completed so as to allow the particles to be measured to fall into the first sieve.

4. The particle size distribution detection device of claim 1, characterized in that: The first screen includes at least two screen layers with different mesh sizes, and the first vibrating screen assembly also includes a first driving mechanism, and the first driving mechanism is respectively connected to the at least two screen layers and the controller; The controller is used to control the first driving mechanism to switch one of the sieve layers to the moving path of the particles to be detected based on a preset particle size range.

5. The particle size distribution detection device of particles according to claim 4, characterized in that: The preset particle size range is D1-D2, D1<D2, and the controller is used to control the first driving mechanism to switch one of the sieve layers whose mesh size is closer to the boundary value D2 and greater than or equal to the boundary value D2 to the path of the particle size to be measured according to the boundary value D2 of the preset particle size range.

6. The particle size distribution detection device of claim 1, characterized in that: The second vibrating screen assembly includes a second screen mesh, the second screen mesh includes at least two screen mesh layers with different mesh sizes, and the second vibrating screen assembly also includes a second driving mechanism, the second driving mechanism is respectively connected to the at least two screen mesh layers and the controller; The preset particle size range is D1-D2, D1<D2, and the controller is used to control the second driving mechanism to switch one of the sieve layers whose mesh size is closer to the boundary value D1 and less than or equal to the boundary value D1 to the path of the part of the particle size to be measured according to the boundary value D1 of the preset particle size range.

7. The particle size distribution detection device of claim 1, characterized in that: The first vibrating screen assembly further includes a first funnel structure, which is located on a side of the first optical structure away from the first screen and is used to accommodate the particles to be tested.

8. The particle size distribution detection device of claim 7, characterized in that: The first funnel structure comprises a first funnel and a first closing member, the first funnel has a first opening facing the first screen, and the first closing member is located at the first opening; The controller is electrically connected to the first sealing member, and is used to control the first sealing member to close or open the first opening, and is used to control the opening degree of the first opening to control the speed at which the particles to be detected enter the first detection space.

9. The particle size distribution detection device of any one of claims 1 to 8, characterized in that: The vibrating sieve device comprises a plurality of groups of vibrating sieve components arranged in sequence along a preset direction, and each group of vibrating sieve components is used to sequentially obtain "particle size-volume" distribution information of particles to be tested within different target particle size ranges.

10. A method for detecting particle size distribution of particles, characterized in that: In a particle size distribution detection device for particles, the particle size distribution detection device comprises a first vibrating screen assembly and a second vibrating screen assembly arranged in sequence along a preset direction, the first vibrating screen assembly forms a first detection space, and the second vibrating screen assembly forms a second detection space; The particle size distribution detection method of the particles comprises: Controlling the particles to be detected to enter the first detection space; Controlling the emission of a first laser and receiving a first detection signal generated by the particle to be measured according to the first detection light scattered by the first laser, acquiring the light intensity angle distribution of the first detection light according to the first detection signal, and weighing the first mass of the particle to be measured; Controlling part of the particles to be detected to enter the second detection space, wherein the particle size of the part of the particles to be detected is smaller than the particle size of the remaining particles to be detected; Emitting a second laser and receiving a second detection signal generated by a second detection light scattered by the part of the particles to be measured according to the second laser, acquiring a light intensity angular distribution of the second detection light according to the second detection signal, and weighing a second mass of the part of the particles to be measured; and Based on the normal distribution curve, according to the light intensity angle distribution, the first mass and the second mass, the "particle size-volume" distribution information of at least part of the particles to be measured is obtained.

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