CN111272620A - Particle size analyzer, particle size analyzer system and sample injection control method - Google Patents
Particle size analyzer, particle size analyzer system and sample injection control method Download PDFInfo
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- CN111272620A CN111272620A CN202010222374.3A CN202010222374A CN111272620A CN 111272620 A CN111272620 A CN 111272620A CN 202010222374 A CN202010222374 A CN 202010222374A CN 111272620 A CN111272620 A CN 111272620A
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- 238000002347 injection Methods 0.000 title claims abstract description 59
- 239000007924 injection Substances 0.000 title claims abstract description 59
- 239000002245 particle Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 32
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 239000000428 dust Substances 0.000 claims description 16
- 238000003921 particle size analysis Methods 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007561 laser diffraction method Methods 0.000 description 1
- 239000000243 solution Substances 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1009—Characterised by arrangements for controlling the aspiration or dispense of liquids
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- Chemical & Material Sciences (AREA)
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a particle size analyzer, a system and a sample injection control method, wherein the particle size analyzer comprises: host computer, injector and sampling controller. The host computer is used for measuring the particle diameter of the sample and the shading ratio of the sample. The sample injector is connected with the test window of the host computer and used for conveying samples into the host computer. The sample injection controller is respectively electrically connected with the host and the sample injector and is used for receiving the shading ratio of the sample fed back by the host and controlling the working strength of the sample injector according to the shading ratio. According to the particle size analyzer adopting the technical scheme, the sampling shading ratio of the measured sample is used as a feedback value to be fed back to the sample injection controller, and the working strength of the sample injector is adjusted in real time according to the difference value between the sampling shading ratio and the set shading ratio, so that the sample injection of the sample injector is more stable, and the change of the external environment can be responded.
Description
Technical Field
The invention relates to the field of particle size analysis equipment, in particular to a particle size analyzer and a particle size analysis system, and further relates to a sample injection control method.
Background
The particle size analyzer is used for measuring the particle size distribution of the particle size, most of the particle size analyzers adopt a laser diffraction method to realize measurement, the shading ratio of a sample has great influence on the accuracy of data, and the sample injection amount needs to be controlled to be a proper value so as to obtain a good measurement effect.
The existing dry-method sample injector usually adopts a vibration mode for sample injection, the control of the sample injector adopts open-loop control, and the sample injection process is unstable, so that the measurement result can fluctuate.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a particle size analyzer, which adopts the sample shading ratio collected by the particle size analyzer as feedback stroke closed-loop control and can ensure that a sample injector can stably sample.
The invention also provides a particle size analysis system comprising the particle size analyzer and a sample injection control method.
In a first aspect, a particle size analyzer according to an embodiment of the present invention includes: a host computer: the device is used for measuring the particle size of a sample and the shading ratio of the sample; the sample injector is connected with the test window of the host computer and is used for conveying samples into the host computer; and the sample injection controller is respectively electrically connected with the host and the sample injector and is used for receiving the shading ratio of the sample fed back by the host and controlling the working strength of the sample injector according to the shading ratio.
The particle size analyzer provided by the embodiment of the invention has at least the following beneficial effects: the host, the sample injector and the sample injection controller form a closed control loop, the closed control loop feeds back the feedback value of the sample shading ratio to the sample injection controller, the sample injection controller controls the working strength of the sample injector according to the difference value of the feedback sample shading ratio and the preset shading ratio, and the working strength of the sample injector influences the sample amount falling into the test window and further influences the shading ratio of the sample. Repeating the above process can make the sample shading ratio equal to the set shading ratio gradually, so that the sample injector can stably provide samples for the host, and the measurement result has no fluctuation.
According to some embodiments of the invention, the injector comprises: the discharging groove is used for containing a sample and is connected with the test window of the host; and the vibrator is connected with the blanking groove and used for driving the blanking groove to vibrate so as to enable the sample in the blanking groove to fall into the test window.
According to some embodiments of the invention, the sample injector further comprises a gyroscope, the gyroscope is arranged on the discharging groove, and the gyroscope is electrically connected with the sample injection controller and used for detecting the vibration intensity of the discharging groove.
According to some embodiments of the invention, the vibrator is a piezoelectric ceramic.
In a second aspect, a particle size analysis system according to an embodiment of the present invention includes: a particle size analyzer according to an embodiment of the first aspect of the invention; and the terminal is electrically connected with the particle size analyzer and is used for displaying and setting parameters and information of the particle size analyzer.
The particle size analysis system provided by the embodiment of the invention has at least the following beneficial effects: the particle size analyzer provided by the embodiment of the first aspect of the invention can set a proper shading ratio through a terminal and obtain a more accurate particle size analysis result of a sample.
According to some embodiments of the invention, further comprising: the dust collection device is respectively and electrically connected with the host and the sample injector and is used for cleaning the test window of the host and the feeding groove of the sample injector; and the dust suction device control box is electrically connected with the dust suction device and is used for controlling the dust suction device.
According to some embodiments of the invention, further comprising: and the outlet of the air compressor is connected with the test window of the host machine or the blanking groove, and a filter valve is further arranged at the outlet of the air compressor.
In a third aspect, a sample injection control method according to an embodiment of the present invention includes:
the method comprises the following steps:
s100: the host samples a sample for a period of time T at a certain sampling frequency, and obtains the sampling shading ratio in the period of time T;
s200: the sampling controller compares the sampling shading ratio with a preset shading ratio to obtain a difference value;
s300: the sample injection controller adjusts the working strength of the sample injector according to the difference value;
steps S100 to S300 are repeated until the difference is 0.
The sample injection control method provided by the embodiment of the invention at least has the following beneficial effects: the sampling shading ratio of the sample measured by the particle size analyzer is used as a feedback value to be fed back to the sample injection controller, and the working intensity of the sample injector is adjusted in real time according to the difference value between the sampling shading ratio and the set shading ratio, so that the sample injection of the sample injector is more stable, and the change of the external environment can be responded.
According to some embodiments of the present invention, the sampling shading ratio in step S100 is an average value of all shading ratio sampling values collected within the time T.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a particle size analyzer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a particle size analysis system according to an embodiment of the present invention
Fig. 3 is a control flow chart of a sample injection control method according to an embodiment of the present invention.
Reference numerals:
the number of test windows in the host 100, test window 110,
a sample injector 200, a feed chute 210, a vibrator 220, a gyroscope 230,
the sample injection controller 300, the indicator light 310,
the number of terminals 400, printers 410,
the suction unit 500, the suction unit control box 510,
an air compressor 600 and a filter valve 610.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 2, a particle size analyzer according to an embodiment of a first aspect of the present invention includes: a host 100, a sample injector 200, and a sample injection controller 300. The host 100 is used for measuring the particle size distribution and the light shielding ratio of the sample, and the function and structure thereof are common knowledge that should be understood or available to those skilled in the art, such as a TopSizer laser particle size analyzer manufactured by europe and america, so that the detailed description thereof will not be provided herein. The sample injector 200 is used for delivering a sample into the host 100 at a certain frequency, so that sample particles can be dispersed for convenient measurement, and the sample injector is mainly divided into a wet sample injection mode and a dry sample injection mode. The lower chute 210 of the sample injector 200 is connected to the test window 110 of the host computer 100, and the sample can fall into the test window 110 from the lower chute 210. The sample controller 300 is configured to control the sample injector 200 according to the data fed back from the host 100, and is electrically connected to the host 100 and the sample injector 200, respectively. The particle size analyzer according to the technical scheme is provided with a closed-loop control circuit, and can implement a closed-loop sample injection control method. The shading ratio of the collected sample is taken as feedback quantity and transmitted to the sample injection controller 300, the sample injection sample injector 300 calculates the difference value between the sample shading ratio and the set shading ratio, then the sample injection quantity of the sample injector 200 is controlled according to the difference value, the sample injection quantity influences the sample shading ratio of the sample to form a closed loop, the sampling shading ratio is gradually equal to the set shading ratio after the control of a plurality of sampling periods, and the stable sample injection of the host is realized. Can respond to the change of external environment, keep the stability of advancing the sample to guarantee the stability of measuring result.
In some embodiments, referring to fig. 1, the sample injector 200 uses a vibrator 220 as a power source of the sample loading slot 210 of the sample injector 200, and the vibrator 220 may vibrate at different frequencies according to the frequency and magnitude of the voltage applied to its two ends to drive the loading slot 210 connected thereto to vibrate, so as to shake the sample in the loading slot 210 into the test window 110 of the host 100. The vibrator 220 is electrically connected to the sample injection controller 300, and the sample injection controller 300 changes the control voltage output to both ends of the vibrator 220 according to the difference fed back by the host 100, thereby implementing the closed-loop control of the sample injector 200.
In some embodiments, the feeding chute 210 is further provided with a gyroscope 230, the gyroscope 230 can detect the vibration intensity of the feeding chute 210, the gyroscope 230 is electrically connected with the sample injection controller 300, and the vibrator 220 can be calibrated by comparing the vibration intensity fed back by the gyroscope 230 with the output intensity of the sample injection controller 300, so as to prevent the vibrator 220 from aging to cause output drop, thereby influencing closed-loop control and test results.
Referring to fig. 2, the particle size analysis system according to the embodiment of the second aspect of the present invention includes the particle size analyzer according to the embodiment of the second aspect of the present invention, and further includes a terminal 400 for displaying the detection result and setting the parameters of the particle size analyzer, wherein the terminal 400 is electrically connected to the particle size analyzer. It is understood that the terminal 400 can be a personal PC or a handheld terminal 400 such as a mobile phone and a tablet computer. If the terminal 400 is a handheld terminal 400, the handheld terminal 400 and the grain size analyzer may be connected by a wireless connection.
Referring to fig. 3, the sample injection control method according to the embodiment of the third aspect of the present invention includes the following three steps:
s100: the host 100 samples a dropped sample for a certain sampling frequency for a certain period of time T and obtains a sampling shading ratio within the period of time T;
s200, the sampling controller 300 compares the sampling shading ratio with a preset shading ratio to obtain a difference value;
s300, the sample injection controller 300 adjusts the working intensity of the sample injector 200 according to the difference value;
repeating the steps S100 to S300 until the difference is 0, so that stable sample injection of the sample injector 200 can be realized, and the measurement result of the particle size analyzer can be stable without fluctuation. It can be understood that, when the sampling light shielding ratio is greater than the set light shielding ratio, that is, the difference between the sampling light shielding ratio and the set light shielding ratio is a positive value, the sample injection controller 300 should control the sample injector 200 to reduce the working strength to reduce the sample injection amount; when the sampling shielding ratio is smaller than the set shielding ratio, i.e. the difference between the sampling shielding ratio and the set shielding ratio is a negative value, the sample injection controller 300 should control the sample injector 200 to increase the working strength to increase the sample injection amount. The increased or decreased magnitude of the sample injector 200 can be obtained by the PID algorithm according to the difference and the set shading ratio, and the proportional coefficient, the integral coefficient and the differential coefficient of the PID algorithm can be pre-recorded in the sample injection controller 300 or can be obtained by the user through self-tuning. According to the sample injection control method of the technical scheme, the light shielding ratio of the sample is used as the feedback quantity to control the sample injection quantity of the sample injector 200, closed-loop control is formed, when the sample injection quantity of the sample changes due to the change of an external environment, the sample injection controller 300 can control the sample injector 200 by adopting the sample injection control method, so that the sample injection quantity of the sample injector 200 is quickly recovered to be normal, the sample injection stability is ensured, and the particle size analyzer can obtain a stable measurement result.
In some embodiments, in order to ensure the accuracy of the sampling shading ratio, the sampling shading ratio is an average value of all the shading ratio sampling values within a period of time T, and the average value can effectively reduce the influence caused by errors of individual sampling values, so that the closed-loop control is more rapid and stable.
The particle size analyzer and the particle size analyzing system according to the embodiment of the present invention will be described in detail in a specific embodiment with reference to fig. 1 and 2. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.
Referring to fig. 1, in this embodiment, the vibrator 220 of the sample injector 200 is made of piezoelectric ceramic, and the sample controller 300 further includes an indicator lamp 310, where the indicator lamp 310 can display the operating state of the sample injector 200 according to the data returned by the sample injector 200.
Referring to fig. 2, in the present embodiment, a terminal 400 is a personal PC and a printer 410 connected to the personal PC. The particle size analyzing system further includes a dust suction apparatus 500 for removing the discharging chute 210 and the test window 110 after the test, and a dust suction apparatus control box 510 electrically connected to the dust suction apparatus 500 for controlling the dust suction apparatus 500. The dust collector control box 510 can control the start, stop and rotation speed of the fan in the dust collector 500, and the dust collector 500 can clean dust and residual samples in the discharging groove 210 and the testing window 110 before and after each measurement, so as to prevent the samples from being polluted and influencing the measurement result. In this embodiment, because the dry sampling method is adopted, in order to disperse particles in the sample in the testing process and make the measurement result more accurate, the particle size analysis system is provided with the air compressor 600, the outlet of the air compressor 600 is connected with the blanking groove 210 of the sample injector 200, and compressed air can be delivered into the blanking groove 210 in the blanking process to blow off the sample. In order to prevent moisture in the atmosphere from affecting the measurement result, the air outlet of the air compressor 600 is connected to the feed chute 210 through the filter valve 610 to filter the moisture in the compressed air. It is understood that the outlet of the air compressor 600 may also be connected to the test window 110.
The particle size analysis system according to the embodiment of the present invention includes the particle size analyzer according to the embodiment of the first aspect of the present invention, and the sample injection control method according to the embodiment of the third aspect of the present invention may be implemented to control the sample injection amount, and the sample injector may respond to the external environment change by adopting the light shielding ratio of the sample as the feedback amount and performing closed-loop control on the sample injector by the stroke, so that stable sample injection may be quickly resumed when the external environment changes, thereby improving the stability of the sample injection amount and making the test result more stable.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (9)
1. A particle size analyzer, comprising:
the host is used for measuring the particle size of the sample and the shading ratio of the sample;
the sample injector is connected with the test window of the host computer and is used for conveying samples into the host computer;
and the sample injection controller is respectively electrically connected with the host and the sample injector and is used for receiving the shading ratio of the sample fed back by the host and controlling the working strength of the sample injector according to the shading ratio.
2. The particle size analyzer of claim 1, wherein the sample injector comprises:
the discharging groove is used for containing a sample and is connected with the test window of the host;
and the vibrator is connected with the blanking groove and used for driving the blanking groove to vibrate so as to enable the sample in the blanking groove to fall into the test window.
3. The particle size analyzer of claim 2, wherein the sample injector further comprises a gyroscope, the gyroscope is disposed on the blanking tank, and the gyroscope is electrically connected to the sample injection controller for detecting the vibration intensity of the blanking tank.
4. The particle size analyzer of claim 2, wherein the vibrator is a piezoelectric ceramic.
5. A particle size analysis system, comprising:
the particle size analyzer of any one of claims 1 to 4;
and the terminal is electrically connected with the particle size analyzer and is used for displaying and setting parameters and information of the particle size analyzer.
6. The particle size analysis system of claim 5, further comprising:
the dust collection device is respectively and electrically connected with the host and the sample injector and is used for cleaning the test window of the host and the feeding groove of the sample injector;
and the dust suction device control box is electrically connected with the dust suction device and is used for controlling the dust suction device.
7. The particle size analysis system of claim 5, further comprising: and the outlet of the air compressor is connected with the test window of the host machine or the blanking groove, and a filter valve is further arranged at the outlet of the air compressor.
8. A sample introduction control method is characterized by comprising the following steps:
s100: the host samples a sample for a period of time T at a set sampling frequency, and obtains a sampling shading ratio in the period of time T;
s200: the sampling controller compares the sampling shading ratio with a preset shading ratio to obtain a difference value;
s300: the sample injection controller adjusts the working strength of the sample injector according to the difference value;
steps S100 to S300 are repeated until the difference is 0.
9. The sample injection control method according to claim 8, wherein the sampling light shielding ratio in step S100 is an average value of all light shielding ratio sampling values collected within the time T.
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| CN202010222374.3A CN111272620A (en) | 2020-03-26 | 2020-03-26 | Particle size analyzer, particle size analyzer system and sample injection control method |
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| CN202010222374.3A CN111272620A (en) | 2020-03-26 | 2020-03-26 | Particle size analyzer, particle size analyzer system and sample injection control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125316A (en) * | 2021-03-29 | 2021-07-16 | 珠海欧美克仪器有限公司 | Shunt protection dry method window and dry method test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125316A (en) * | 2021-03-29 | 2021-07-16 | 珠海欧美克仪器有限公司 | Shunt protection dry method window and dry method test system |
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