CN114166704A - Fine particle size detection and analysis device and method - Google Patents
Fine particle size detection and analysis device and method Download PDFInfo
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- CN114166704A CN114166704A CN202111477461.4A CN202111477461A CN114166704A CN 114166704 A CN114166704 A CN 114166704A CN 202111477461 A CN202111477461 A CN 202111477461A CN 114166704 A CN114166704 A CN 114166704A
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- 239000010419 fine particle Substances 0.000 title claims abstract description 97
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000004458 analytical method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 5
- 239000002245 particle Substances 0.000 claims description 68
- 239000000428 dust Substances 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
- G01N15/0227—Investigating particle size or size distribution by optical means using imaging; using holography
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Abstract
A fine particle size detection and analysis device comprises a horizontal motion force generator, a horizontal motion force generator and a horizontal motion force generator, wherein the horizontal motion force generator blows wind in a horizontal wind direction to vertically fall fine particles to be detected, so that the fine particles move in a horizontal direction; a plurality of sorting aggregate hoppers arranged along the direction of the wind blown by the horizontal power generator for collecting the fine particles falling down; and the image cameras are respectively positioned below one classified collecting funnel and used for shooting the fine particles classified by the classified collecting funnel. The air outlet of the horizontal motion force generator is provided with a multi-layer wedge-shaped drainage structure.
Description
Technical Field
The invention belongs to the technical field of particle size detection, and particularly relates to a fine particle size detection analysis device and a fine particle size detection analysis method.
Background
Particles having a particle size of 0.075 to 4.75 mm are generally referred to as fine particles, and particles having a particle size of 0.075 mm or less are dust. In the practice of production and living, when the particle size and shape of fine particles are required to be detected and analyzed, the particles have great difficulty due to small particle size and large quantity. The conventional weighing measurement method requires sampling in a static state, such as a production line is stopped for sampling, and the sample is sent to a laboratory for screening weighing measurement. The process has long detection period and small sampling amount of samples, and the detection and analysis result cannot accurately reflect the actual condition of the original particle object.
Disclosure of Invention
The embodiment of the invention relates to a fine particle size detection and analysis device, which comprises a particle container for containing fine particles to be detected,
the flow control stirrer is used for stirring and quantitatively regulating and controlling the fine particles to be detected conveyed from the particle container through an outlet of the particle container, and is used for controlling the quantity of the fine particles entering a subsequent detection link;
the conveying sliding plate is positioned below the outlet of the flow control stirrer and is in a downward inclined shape, and fine particles to be detected in the particle container fall onto the conveying sliding plate and fall onto the particle conveying belt along the conveying sliding plate;
the particle conveyor belt is used for receiving the fine particles to be detected, which slide down from the conveying sliding plate, and conveying the fine particles to the tail end of the particle conveyor belt to vertically fall down;
the horizontal motion force generator blows wind in a horizontal wind direction to the fine particles to be detected which fall vertically from the tail end of the particle conveyor belt, so that the fine particles move in a horizontal direction;
a plurality of sorting aggregate hoppers arranged along the direction of the wind blown by the horizontal power generator for collecting the fine particles falling down;
and the image cameras are respectively positioned below one classified collecting funnel and used for shooting the fine particles classified by the classified collecting funnel.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
FIG. 1 is a schematic diagram of a fine particle detection apparatus according to one embodiment of the present invention.
FIG. 2 is a schematic diagram of fine particles falling after being detached from horizontal power according to one embodiment of the present invention.
Fig. 3 is a schematic view of a wind outlet of a horizontal motion power generator according to one embodiment of the invention.
The device comprises a particle container, a flow control stirrer, a controllable feeding vibrator, a material quantity sensor, a particle conveyor belt, a horizontal motion force generator, a controllable centrifugal dust collector, a classification aggregate hopper, a high-speed image camera, a shooting conveyor belt, a particle recovery container and a conveying sliding plate, wherein the particle container is 1, the flow control stirrer is 2, the controllable feeding vibrator is 3, the material quantity sensor is 4, the particle conveyor belt is 5, the horizontal motion force generator is 6, the controllable centrifugal dust collector is 7, the dust collector is 8, the classification aggregate hopper is 9, the high-speed image camera is 10, the shooting conveyor belt is 11, the particle recovery container is 12, and the conveying sliding plate is 13.
Detailed Description
According to one or more embodiments, the apparatus for fine particle size detection and analysis is composed of a particle container, a flow control and stirrer, a controllable feeding vibrator, a material quantity sensor, a particle conveyor belt, a horizontal motion force generator, a controllable centrifugal dust collector, a dust container, a classified collecting hopper, a high-speed image camera, a shooting conveyor belt and a particle recovery container, as shown in fig. 1.
The fine particles and dust entering the device for particle size detection analysis are subjected to total mass measurement.
The particle container is used for containing fine particles to be detected and dust mixed therein and conveying the fine particles to the flow control and stirrer.
The flow control and stirrer is used for controlling the quantity of fine particles entering a subsequent detection link and dust mixed in the fine particles. Wherein the agitator oscillates periodically so that fine particles and dust mixed therein can enter and exit the flow control and agitator. The swing period of the stirrer determines the output quantity of the stirrer so as to realize flow control. The flow control and stirrer receives information from the material quantity sensor and determines the flow control according to the information.
The controllable feeding vibrator is arranged on the fine particle conveying sliding plate and generates variable frequency vibration for balancing fine particles entering the particle conveying belt and dust mixed in the fine particles, and the particle conveying speed reaching the particle conveying belt is controlled according to the variable frequency vibration; the material quantity sensor is used for measuring the instantaneous quantity and the cumulant of the fine particles falling into the fine particle conveying sliding plate, and the information is fed to the flow control and stirring device, the controllable feeding vibrator and the particle conveying belt and provides a control basis for the flow control and stirring device, the controllable feeding vibrator and the particle conveying belt; the particle conveyor belt conveys the fine particles after the preliminary equalization to a designated position, and a horizontal power generation device carries out horizontal power holding on the fine particles and the dust mixed in the fine particles;
the horizontal motion force generator is a programmable directional wind power generator and is used for providing horizontal power for the fine particles which are conveyed to the tail end by the particle conveyor and fall vertically and the dust mixed in the fine particles, so that the fine particles and the dust mixed in the fine particles move in the horizontal direction. The directional wind force is a horizontal force that decays with increasing distance, seen in the horizontal direction (x direction), where the wind force f (x) is:
F(x)＝1/2CdρS[v(x)]2， (1)
wherein, S: tuyere section, Cd: drag coefficient, ρ: gas density, v (x): wind speed at x. The fine particles and the dust mixed therein which originally fall vertically obtain horizontal power when falling to a position vertical to the tuyere of the horizontal motion force generator, and when falling below the position vertical to the tuyere of the horizontal motion force generator, the horizontal power is lost, and the fine particles and the dust mixed therein perform horizontal projectile motion at a horizontal initial velocity at that moment, as shown in fig. 2.
When the fine particles and the dust mixed therein obtain a horizontal dynamic force, each of the fine particles and the dust mixed therein obtains a corresponding acceleration in the horizontal direction, thereby changing the velocity thereof in the horizontal direction. The larger the particle size of the fine particles, the larger the mass thereof, the smaller the acceleration thereof, and thus the smaller the acceleration thereof in the horizontal direction. Therefore, after the horizontal direction power is lost, the initial velocity of each fine particle in the horizontal direction is inversely proportional to the mass, so that the horizontal movement distance of the fine particles having a small particle diameter is larger at the same falling height. According to this principle, the fine particles and the dust mixed therein are classified by particle size (in the examples, dust having a particle size of less than 0.075 mm is one type, fine particles having a particle size of 0.075 mm to 0.3 mm is one type, fine particles having a particle size of 0.3 mm to 1.2 mm is one type, and fine particles having a particle size of 1.2 mm to 4.75 mm is one type). The classified fine particles and the dust mixed therein respectively enter the storage space, wherein the dust enters the special dust storage device, and other fine particles enter the image shooting link through the classified aggregate funnel. In order to effectively use the wind power, the wind power outlet of the horizontal motion power generator is designed in a multi-layer form, as shown in fig. 3. The wind source forms directional airflow in the pipeline and outputs the airflow through split drainage;
the controllable centrifugal dust collector is used for strengthening the dust storage operation; the dust container is used for containing dust and weighing and metering the dust; the high-speed image camera is used for carrying out image shooting on various classified fine particles and carrying out visual processing measurement and statistics;the shooting conveyor belt is used for conveying classified fine particlesContinuously shooting by a high-speed image camera; the particle recovery vessel is used to collect all fine particles after the recovery measurement. The horizontal motion force generator, the controllable centrifugal dust collector, the dust container, the classified aggregate hopper, the high-speed image camera, the shooting conveyor belt and the particle recovery container are arranged in two ways, the first way is as shown in figure 1,for mounting in a position in which fine particles fall from the particle conveyor On the side below the particle conveyor(ii) a The second way is to install under the particle conveyor where the fine particles fall from the particle conveyorThe opposite sideI.e. byThe direction of the power generated by the horizontal power generator and the particle conveyor conveying the particles The directions are consistent.
Therefore, the invention performs primary screening on fine particles and dust with the particle size of less than 4.75 mm, wherein the dust with the particle size of less than 0.075 mm is classified as one type, the fine particles with the particle size of 0.075 mm to 0.3 mm is classified as one type, the fine particles with the particle size of 0.3 mm to 1.2 mm is classified as one type, and the fine particles with the particle size of 1.2 mm to 4.75 mm is classified as one type. And after the dust after primary screening is collected, the quantity information of the dust is obtained in a weighing mode, and the quantity, the grain diameter and the grain shape information of other three types of fine grains are obtained in an image processing mode.
It should be noted that while the foregoing has described the spirit and principles of the invention with reference to several specific embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, nor is the division of aspects, which is for convenience only as the features in these aspects cannot be combined. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. A fine particle size detection and analysis device is characterized by comprising,
the horizontal motion force generator blows wind in a horizontal wind direction to the fine particles to be detected which fall vertically, so that the fine particles move in a horizontal direction;
a plurality of sorting aggregate hoppers arranged along the direction of the wind blown by the horizontal power generator for collecting the fine particles falling down;
and the image cameras are respectively positioned below one classified collecting funnel and used for shooting the fine particles classified by the classified collecting funnel.
2. The fine particle size detection and analysis device of claim 1, wherein the air outlet of the horizontal motion force generator has a multi-layer wedge-shaped flow guide structure.
3. The fine particle size detection and analysis device according to claim 1, further comprising a dust collector and a dust receiver,
the dust collector is arranged in a queue formed by the plurality of classified material collecting funnels and is the farthest end opposite to the horizontal power generator,
when the fine particles are mixed with dust, the dust collector sucks the dust falling into the fine particles in the classifying and collecting hopper process, and the dust collector receives the dust.
4. The fine particle size detection and analysis device according to claim 1, further comprising,
a particle container for containing fine particles to be detected,
and the particle conveyor belt is used for receiving the fine particles to be detected, which fall out of the particle container, and conveying the fine particles to the position above the air outlet of the horizontal power generator.
5. The fine particle size detection and analysis apparatus according to claim 4, further comprising,
and the conveying sliding plate is positioned below the outlet of the particle container and is in a downward inclined shape, and fine particles to be detected in the particle container fall onto the conveying sliding plate and fall onto the particle conveying belt along the conveying sliding plate.
6. The apparatus according to claim 5, wherein the feeding vibrator is provided on the transportation slide plate, and the feeding vibrator generates variable frequency vibration for uniformly distributing the fine particles to be fed into the particle conveyor belt.
7. The apparatus for detecting and analyzing the particle size of fine particles according to claim 6, wherein the transportation slide plate is provided with a material amount sensor,
the material quantity sensor is used for measuring the instantaneous quantity and the accumulated quantity of the fine particles falling into the fine particle conveying sliding plate.
8. The fine particle size detection and analysis apparatus according to claim 4, wherein the detection and analysis apparatus further comprises a flow control stirrer,
the flow control stirrer is communicated with an outlet of the particle container, stirs the fine particles to be detected conveyed by the particle container and adjusts and controls the quantity of the fine particles to be detected, so that the quantity of the fine particles entering a subsequent detection link can be controlled.
9. The fine particle size detection and analysis apparatus according to claim 1, further comprising a particle recovery container for collecting and recovering the fine particles falling from each classifying and collecting hopper, which have been shot-detected.
10. A method for detecting and analyzing the particle size of fine particles, which is characterized by comprising the following steps,
arranging a horizontal motion force generator, blowing wind in a horizontal wind direction to the fine particles to be detected which fall vertically, and enabling the fine particles to move in a horizontal direction;
arranging a plurality of sorting aggregate hoppers arrayed along the wind direction blown out by the horizontal power generator, and collecting the fine particles falling down;
a plurality of image cameras are arranged and respectively positioned below a classifying aggregate funnel and used for shooting fine particles classified by the classifying aggregate funnel,
calculating to obtain a particle diameter or a radius of the fine particles by processing the acquired plurality of images of the fine particles.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111477461.4A CN114166704A (en) | 2021-12-06 | 2021-12-06 | Fine particle size detection and analysis device and method |
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| CN202111477461.4A CN114166704A (en) | 2021-12-06 | 2021-12-06 | Fine particle size detection and analysis device and method |
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| CN112845086A (en) * | 2020-12-31 | 2021-05-28 | 山西烁科晶体有限公司 | Device and method for simultaneously sorting density and particle size of silicon carbide powder |
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2021
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Patent Citations (10)
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| WO2003005000A1 (en) * | 2001-07-02 | 2003-01-16 | Universite De Liege | Method and arrangement for particle measurement by image analysis |
| CN101929943A (en) * | 2010-08-09 | 2010-12-29 | 长安大学 | Digital imaging acquisition system for aggregate grading detection and acquisition method thereof |
| CN105383073A (en) * | 2014-09-03 | 2016-03-09 | 波音公司 | Chopped fiber composite sorting and molding systems and methods |
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