CN116148222A - Material blending uniformity real-time monitoring method and device based on laser diffraction technology - Google Patents
Material blending uniformity real-time monitoring method and device based on laser diffraction technology Download PDFInfo
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4788—Diffraction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
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- G01N15/0211—Investigating a scatter or diffraction pattern
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
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Abstract
The invention discloses a real-time monitoring method and device for material blending uniformity based on a laser diffraction technology, and the method comprises a material uniformity evaluation method and a real-time sampling device, wherein the material uniformity evaluation method adopts the real-time monitoring method based on the laser diffraction technology, and the real-time sampling device adopts a rotary material taking disc type sampling device arranged on the side surface of a blending cabin at the bottom of a storage bin; according to the invention, a real-time monitoring method based on a laser diffraction technology is adopted to obtain the particle size or shape information of the sampled material, the particle size or shape information is used as a calculation evaluation basis for analyzing the mixing uniformity of particles, a rotary material taking disc type sampling device is adopted and is arranged on the side surface of a mixing cabin at the bottom of a material bin, the mixing uniformity change after the mixing work is completed is evaluated in real time through dimensionless mixing uniformity display, the mixing process parameters are adjusted accordingly, the vibration frequency, amplitude and other parameters of a mixing pipe in the material bin are adjusted timely, and the uniformity of the output material of the mixing material bin is stable.
Description
Technical Field
The invention relates to a method and a device for monitoring material blending uniformity in real time, in particular to a method and a device for monitoring material blending uniformity in real time based on a laser diffraction technology, and belongs to the technical field of material uniformity real-time monitoring and evaluating systems.
Background
When the bulk materials are processed, certain requirements exist for the quality of the materials in order to ensure that the production process achieves certain stability, and materials with different layers can be mixed by using a multi-pipe mixing bin according to the requirements, so that the aim of maintaining the quality of the conveyed materials near a fixed uniform level is fulfilled. The device relies on the natural flow of material under gravity environment, piles up the feed inlet that a plurality of blending pipes opened on different height in the feed bin get into at different height, concentrate to the buffering storehouse of bottom through the material pipe, realize the purpose of blending to obtain the material that the mixing is accomplished, the quality is even.
In practical application, in order to ensure the blending effect, the efficiency of particles entering the blending pipe is improved by arranging the blending pipe vibrating up and down. However, in practical application, the material enters the blending material pipe under different conditions due to the influence of the vibration characteristic difference of the upper end and the lower end of the material receiving pipe, and the uniformity of the final material is different from that of an ideal state. In addition, the rationality of the arrangement of the feed inlets, the distribution rule of materials in the bin and the like can influence the final blending effect, so that the industrial production is greatly influenced, including but not limited to unstable quality of the produced products and the like.
In summary, the real-time monitoring and evaluating system for the uniformity of the material in the mixing bin is needed to timely adjust the vibration frequency, amplitude and other parameters of the mixing tube in the bin, so that the uniformity of the material in the mixing bin is stable.
Disclosure of Invention
The invention aims to solve at least one technical problem and provides a method and a device for monitoring material blending uniformity in real time based on a laser diffraction technology.
The invention realizes the above purpose through the following technical scheme: a real-time monitoring method for material blending uniformity based on a laser diffraction technology comprises the following steps:
the method comprises the steps that firstly, a laser emits laser beams, the laser beams are respectively focused, filtered and collimated through an objective lens, a pinhole and a collimating lens, the laser beams are changed into parallel beams and are directly projected onto a sampling material, part of the light is scattered, and the scattered light passes through a Fourier lens and then irradiates a photoelectric detector array to obtain particle size information of the sampling material;
step two, calculating the total blending uniformity M of the sampled materials;
and thirdly, outputting a blending uniformity value by a computer, wherein the blending uniformity value is more similar to 1, the blending state of the sampled materials is more similar to an ideal complete blending state, namely, the blending bin works well, the discharging is uniform, and otherwise, the discharging is nonuniform.
As a further technical scheme of the invention: in step one, the photodetector array consists of a series of concentric rings, each of which can be considered as an independent detector; as any point on the photoelectric detector corresponds to a certain scattering angle, the particle size information of the sampled material can be linearly converted into voltage in a scattering light mode, the voltage signal is amplified through the data acquisition card, and the particle size information of the material is sent to the computer terminal after A/D conversion.
As a further technical scheme of the invention: in the second step, the following formula is adopted for calculating the total blending uniformity M of the sampled materials:
wherein ,M j is the firstjThe mixing degree of the component materials is calculated,nis the total particle fraction of the composition,S j is the firstjThe actual standard deviation of the component materials after blending,S j0 is the firstjThe component materials being initially completely unblendedjThe standard deviation of the distribution of the component materials,mis the number of samples to be taken,X ij is a sampleiMiddle (f)jThe ratio of the component materials is calculated,a j is the firstjThe initial material ratio of the component materials.
As a further technical scheme of the invention: in the third step, the method also comprises the step of inputting a blending uniformity warning value into a computer terminalM warn Blending uniformity adjustment valueM min The normal value range of the mixed material sampling sample isM warn 1, namely the uniformity of the materials is within an error range, the blending effect of the bin is good, and the bin continues to work and executes the next sampling cycle; if it isMA value less thanM marn I.e. the blending effect is not ideal, blendingThe uniformity of the mixed materials can not reach the standard, and a warning is sent whenMA value less thanM min I.e. the blending effect is not ideal, and the technological parameters such as the vibration amplitude and the vibration frequency of the blending material pipe are actively adjusted.
The utility model provides a sampling device based on laser diffraction technique's material blending degree of consistency real-time supervision method, real-time sampling device is the rotatory feeding tray sampling device of a mixing cabin side of installing in the feed bin bottom, real-time sampling device includes step-by-step rotating electrical machines and installs the feeding tray in step-by-step rotating electrical machines axis of rotation, on the feeding tray distribute a plurality of hole grooves of getting in the circumferencial direction, one side of step-by-step rotating electrical machines is provided with the material analysis window that is located the feeding tray below, vertical being connected with the conveying pipe in the material analysis window, the conveying pipe obtain the bottom be connected with the communicating inclined tube of feed bin.
As still further aspects of the invention: the below of taking the material dish is provided with sampling platform bottom plate, and sampling platform bottom plate has offered the perforation that is located directly over the conveying pipe and is linked together with the conveying pipe.
As still further aspects of the invention: the lower bottom plate of the material taking disc is welded with the bin body of the bin, the upper part of the material taking disc and the side ring plate are tightly connected through bolt gaskets, and meanwhile, the joint of the upper sealing plate of the material taking disc and the bin body is sealed through sealant.
As still further aspects of the invention: eight material taking hole grooves are distributed in the circumferential direction of the material taking disc in an array mode.
The beneficial effects of the invention are as follows:
1) Acquiring particle size or shape information of the sampled material by adopting a real-time monitoring method based on a laser diffraction technology, and taking the particle size or shape information as a calculation evaluation basis for analyzing the mixing uniformity of particles;
2) The rotary material taking disc type sampling device is adopted, the rotary material taking disc type sampling device is arranged on the side surface of the mixing cabin at the bottom of the material bin, the embedded material bin is adopted for sampling, the mixing uniformity change after the mixing work is completed through dimensionless mixing uniformity display real-time evaluation, the mixing process parameters are adjusted accordingly, the whole process guarantee of the mixing uniformity is realized, the effective subjective control is realized, the vibration frequency, the amplitude and other parameters of the mixing pipe inside the material bin can be adjusted timely, and the uniformity of the output materials of the mixing material bin is stable.
Drawings
FIG. 1 is a schematic diagram of a process for analyzing the particle size of a laser diffraction material according to the present invention;
FIG. 2 is a flow chart of real-time detection of material blending uniformity using the laser diffraction technique of the present invention;
FIG. 3 is a schematic diagram of a real-time sampling device according to the present invention;
fig. 4 is a schematic top view of the take-off tray of the present invention.
In the figure: 1. step-by-step rotating electrical machines, 2, sampling platform bottom plate, 3, get material dish, 4, get material hole groove, 5, material analysis window, 6, conveying pipe, 7, inclined tube, 8, get material hole groove.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1 to 2, a real-time monitoring method for material blending uniformity based on a laser diffraction technology is a real-time material blending uniformity evaluation method, and adopts the laser diffraction technology to monitor in real time so as to obtain particle size or shape information of a sampled material, thereby being used as a calculation evaluation basis for analyzing the blending uniformity of particles.
The real-time monitoring method for the material blending uniformity specifically comprises the following steps:
first: the laser emits laser beams, the laser beams are respectively focused, filtered and collimated through the objective lens, the pinhole and the collimating lens, the laser beams are changed into parallel beams, the parallel beams are directly projected onto the sampling materials, part of the light is scattered, and the scattered light passes through the Fourier lens and then irradiates the photoelectric detector array, so that the particle size or shape information of the sampling materials is obtained.
The photoelectric detector array consists of a series of concentric annular bands, each annular band can be regarded as an independent detector, and as any point on the photoelectric detector corresponds to a certain scattering angle, the particle size information of the sampled material can be linearly converted into voltage in a scattering light mode, the voltage signal is amplified through a data acquisition card, and then the particle size information of the material is sent to a computer terminal after A/D conversion.
Second,: calculating the total blending uniformity M of the sampled materials;
the total blending uniformity M of the sampled material was calculated using the following formula:
wherein ,M j is the firstjThe mixing degree of the component materials is calculated,nis the total particle fraction of the composition,S j is the firstjThe actual standard deviation of the component materials after blending,S j0 is the firstjThe component materials being initially completely unblendedjThe standard deviation of the distribution of the component materials,mis the number of samples to be taken,X ij is a sampleiMiddle (f)jThe ratio of the component materials is calculated,a j is the firstjThe initial material ratio of the component materials.
Third,: the computer outputs a blending uniformity value, the blending uniformity value is more similar to 1, the blending state of the sampled materials is more similar to an ideal complete blending state, namely, the blending bin works well, the discharging is uniform, and otherwise, the discharging is nonuniform;
the whole sampling flow is intermittently and repeatedly carried out, the sampling output result of each time is displayed in a line diagram form in real time, the change condition of uniformity of the blending material is reflected in real time through the image pulsation condition, and the real-time observation of the blending effect is realized;
also includes inputting blending uniformity warning value into computer terminalM warn Blending uniformity adjustment valueM min Normal of sample of blended materialThe value range isM warn 1, namely the uniformity of the materials is within an error range, the blending effect of the bin is good, and the bin continues to work and executes the next sampling cycle; if it isMA value less thanM marn I.e. the blending effect is not ideal, the uniformity of the blended materials can not reach the standard, and a warning is sent whenMA value less thanM min I.e. the blending effect is not ideal, and the technological parameters such as the vibration amplitude and the vibration frequency of the blending material pipe are actively adjusted.
Example 2
As shown in fig. 3, the real-time sampling device is a rotary material taking disc type sampling device which is installed on the side surface of the blending cabin at the bottom of the bin; the real-time sampling device comprises a stepping rotating motor 1 and a material taking disc 3 arranged on the rotating shaft of the stepping rotating motor 1, a plurality of material taking hole grooves are distributed on the material taking disc 3 in the circumferential direction, a material analysis window 5 positioned below the material taking disc 3 is arranged on one side of the stepping rotating motor 1, a material conveying pipe 6 is vertically connected in the material analysis window 5, and the bottom end of the material conveying pipe 6 is connected with an inclined pipe 7 communicated with a storage bin.
The below of taking disc 3 is provided with sampling platform bottom plate 2, and sampling platform bottom plate 2 has offered the perforation that is located just above feed pipe 6 and is linked together with feed pipe 6, because the barrier of sampling platform bottom plate 2, the sample material piles up in taking hole groove 4, then according to the settlement time, taking disc 3 rotates to the outside corresponding position of pay-off storehouse, taking hole groove 4 lower opening and bottom plate opening coincidence, the sample material whereabouts is to material analysis window 5.
The lower bottom plate of the material taking disc 3 is welded with the bin body of the bin, the upper part of the material taking disc 3 and the side ring plate are tightly connected through bolt gaskets, and meanwhile, the joint of the upper sealing plate of the material taking disc 3 and the bin body is sealed through sealant, so that materials are prevented from being contacted with the outside in the sampling process.
As shown in fig. 4, eight material taking hole slots are distributed in the circumferential direction in an array manner on the material taking tray.
The method is characterized in that a real-time monitoring method based on a laser diffraction technology is adopted to obtain the particle size or shape information of the sampling materials, the particle size or shape information is used as a calculation evaluation basis for analyzing the mixing uniformity of particles, the mixing uniformity change after the mixing work is completed is evaluated in real time through dimensionless mixing uniformity M, and the mixing process parameters are adjusted accordingly, so that the whole process guarantee of the mixing uniformity is realized.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (8)
1. A real-time monitoring method for material blending uniformity based on a laser diffraction technology is characterized by comprising the following steps:
step one, a laser emits laser beams, the laser beams are respectively focused, filtered and collimated through an objective lens, a pinhole and a collimating lens, the laser beams are changed into parallel beams and are directly projected onto a sampling material, part of the light is scattered, and the scattered light passes through a Fourier lens and then irradiates a photoelectric detector array so as to obtain particle size or shape information of the sampling material;
step two, calculating the total blending uniformity M of the sampled materials;
and thirdly, outputting a blending uniformity value by a computer, wherein the blending uniformity value is more similar to 1, the blending state of the sampled materials is more similar to an ideal complete blending state, namely, the blending bin works well, the discharging is uniform, and otherwise, the discharging is nonuniform.
2. The method for monitoring the blending uniformity of materials in real time based on the laser diffraction technology according to claim 1, wherein the method comprises the following steps: in step one, the photodetector array is comprised of a series of concentric rings, each of which is considered as an independent detector;
as any point on the photoelectric detector corresponds to a certain scattering angle, the particle size information of the sampled material can be linearly converted into voltage in a scattering light mode, the voltage signal is amplified through the data acquisition card, and the particle size information of the material is sent to the computer terminal after A/D conversion.
3. The method for monitoring the blending uniformity of materials in real time based on the laser diffraction technology according to claim 1, wherein the method comprises the following steps: in the second step, the following formula is adopted for calculating the total blending uniformity M of the sampled materials:
wherein ,M j is the firstjThe mixing degree of the component materials is calculated,nis the total particle fraction of the composition,S j is the firstjThe actual standard deviation of the component materials after blending,S j0 is the firstjThe component materials being initially completely unblendedjThe standard deviation of the distribution of the component materials,mis the number of samples to be taken,X ij is a sampleiMiddle (f)jThe ratio of the component materials is calculated,a j is the firstjThe initial material ratio of the component materials.
4. The method for monitoring the blending uniformity of materials in real time based on the laser diffraction technology according to claim 1, wherein the method comprises the following steps: in the third step, the method also comprises the step of inputting a blending uniformity warning value into a computer terminalM warn Blending uniformity adjustment valueM min Blending materialsThe normal value range of the sampling sample isM warn 1, namely the uniformity of the materials is within an error range, the blending effect of the bin is good, and the bin continues to work and executes the next sampling cycle; if it isMA value less thanM marn I.e. the blending effect is not ideal, the uniformity of the blended materials can not reach the standard, and a warning is sent whenMA value less thanM min I.e. the mixing effect is not ideal, and the process parameters of the amplitude and the frequency of the vibration of the mixing pipe are actively adjusted.
5. A real-time sampling device for implementing the real-time monitoring method for material blending uniformity based on laser diffraction technology as claimed in claim 1, which is characterized in that:
the real-time sampling device comprises a stepping rotating motor (1) and a material taking disc (3) arranged on the rotating shaft of the stepping rotating motor (1);
a plurality of material taking hole grooves (8) are distributed on the material taking disc (3) in the circumferential direction;
one side of the stepping rotary motor (1) is provided with a material analysis window (5) positioned below the material taking disc (3);
a feeding pipe (6) is vertically connected in the material analysis window (5);
the bottom end of the feeding pipe (6) is connected with an inclined pipe (7) communicated with the storage bin.
6. A real time sampling device according to claim 5, wherein: the lower part of the material taking disc (3) is provided with a bottom plate (2) at the bottom of the sampling table, and the bottom plate (2) at the bottom of the sampling table is provided with a perforation which is positioned right above the material conveying pipe (6) and is communicated with the material conveying pipe (6).
7. A real time sampling device according to claim 5, wherein: the lower bottom plate of the material taking disc (3) is connected with the bin body of the bin, the upper part of the material taking disc (3) and the side ring plates are tightly connected through bolt gaskets, and meanwhile, the joint of the upper sealing plate of the material taking disc (3) and the bin body is sealed through sealant.
8. A real time sampling device according to claim 7, wherein: eight material taking hole grooves (8) are distributed in the circumferential direction of the material taking disc (3) in an array mode.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661911A (en) * | 2012-04-26 | 2012-09-12 | 西安理工大学 | Method for rapidly detecting mixing uniformity of powdery material |
| CN206557057U (en) * | 2017-02-28 | 2017-10-13 | 珠海真理光学仪器有限公司 | Laser particle analyzer |
| CN110208266A (en) * | 2019-06-20 | 2019-09-06 | 长沙理工大学 | A kind of reclaimed asphalt mixture uniformity evaluating method |
| CN112461717A (en) * | 2020-11-06 | 2021-03-09 | 东莞东阳光科研发有限公司 | Method for detecting dry powder mixing uniformity |
| CN213474647U (en) * | 2020-09-07 | 2021-06-18 | 天津中德应用技术大学 | Automatic sampling and conveying device for powder materials |
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- 2023-04-14 CN CN202310396602.2A patent/CN116148222B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661911A (en) * | 2012-04-26 | 2012-09-12 | 西安理工大学 | Method for rapidly detecting mixing uniformity of powdery material |
| CN206557057U (en) * | 2017-02-28 | 2017-10-13 | 珠海真理光学仪器有限公司 | Laser particle analyzer |
| CN110208266A (en) * | 2019-06-20 | 2019-09-06 | 长沙理工大学 | A kind of reclaimed asphalt mixture uniformity evaluating method |
| CN213474647U (en) * | 2020-09-07 | 2021-06-18 | 天津中德应用技术大学 | Automatic sampling and conveying device for powder materials |
| CN112461717A (en) * | 2020-11-06 | 2021-03-09 | 东莞东阳光科研发有限公司 | Method for detecting dry powder mixing uniformity |
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