CN1864059A - Method for continuously controlling the particle size distribution of powders used in the ceramics industry, and plant for its implementation - Google Patents
Method for continuously controlling the particle size distribution of powders used in the ceramics industry, and plant for its implementation Download PDFInfo
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- CN1864059A CN1864059A CN 200480029469 CN200480029469A CN1864059A CN 1864059 A CN1864059 A CN 1864059A CN 200480029469 CN200480029469 CN 200480029469 CN 200480029469 A CN200480029469 A CN 200480029469A CN 1864059 A CN1864059 A CN 1864059A
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Abstract
Method for continuously controlling the particle size distribution of ceramic powders leaving the powder forming plant, comprising at least the following steps: withdrawing at least one powder sample at predetermined intervals; measuring the particle size distribution of the withdrawn sample; comparing the measured particle size distribution with a reference particle size distribution by means of a processor; regulating at least one parameter of said powder forming plant influencing the particle size distribution, on the basis of the differences between the measured particle size distribution and the reference particle size distribution; and plant for its implementation.
Description
Technical field
The equipment and the correlation technique of the size-grade distribution of the powder that the present invention relates to be used for to control and determine to use in ceramic industry, the ceramic powders that above-mentioned powder particularly obtains by spray drying or atomization, be also referred to as atomized powder, perhaps the powder that obtains by drying and grinding.
Background technology
The equipment of producing this atomized powder is commonly called atomizer.
Method known use such as screening, laser diffraction, ultrasound wave sound spectrum and the microscopic analysis determines that powder size distributes.
Have good accuracy and cheaply fast manner of execution be based on the image that processing is obtained by suitable video camera or camera or known optical metrology (optometric) mechanism; This method is called as CAIA (computer-aided image analysis).
Known method makes can compare the size-grade distribution (with weight or volume) of analyzing ceramic powders by the distribution with needs.
Carry out this analysis so that avoid using the ceramic powders of the size-grade distribution with overshoot scope, this powder can make the factor of porosity of formed thereby ceramic tile not satisfy the criterion of acceptability that limits in the quality rules.
In practice, the technical specialist analyzes the particle size distribution numbers of described powder usually, thereby directly regulates the parameter of control powder manufacturing apparatus (for example atomizer) operation, is in the preset range so that keep grain-size distribution curve.
Therefore, these adjustings need expert's existence, and this expert can finish described measurement, deal with data and suitably change the numerical value of described parameter subsequently.
These operations may cause a high proportion of human error, and be created in statistical uncertainty, low measuring speed that obtains the data aspect and the delay of regulating powder manufacturing apparatus thereupon, and because to have that at least one technical operation person's monitoring causes final expensive concerning company.
Summary of the invention
The objective of the invention is in the framework of simple and reasonable plan, overcome aforesaid shortcoming.Especially, the present invention proposes to make and measures and the robotization of record grain-size distribution curve, and by with functional connection of a system make its control come into force, the mechanism of at least one operating parameter of wherein said this system by being used for conditioning equipment determines to leave powder production equipment particularly from the size-grade distribution of the particle of atomizer.
By the feature that limits in the claims, the present invention has realized this purpose.
The present invention is applicable to the powder of any kind in ceramics, also comprises the powder that for example obtains by drying and grinding.
Hereinafter will be particularly related to the powder that obtains by atomization, but adjust parameter by changing, following description also can be at the powder that is obtained by other method.
For the powder that is obtained by drying and grinding, the parameter that is used to control size-grade distribution is a milling time, and is the rotational speed of muller in processing continuously.
Have been found that in atomization plant in fact and just can adjust grain-size distribution curve expediently as parameter that described slurry feed pressure means that high pressure produces more little powder particle more by slurry (slip) feed pressure of selecting to enter in the atomizer.
The present invention includes the control method of online feedback, it comprises: extract at least one powdered sample with predetermined space; Determine and measure the size-grade distribution of extraction sample; Compare by the size-grade distribution and the benchmark size-grade distribution of processor described measurement; And on the basis of measuring the difference between curve and the datum curve, adjust at least one parameter of the powder manufacturing equipment that influences size-grade distribution.Under the situation of atomizer device, as stated, the parameter of adjustment is the slurry feed pressure that enters in the atomizer.
Under the situation of continuously grinding equipment, described parameter is the rotational speed of muller.
The present invention also comprises the equipment that is used to realize described method according to claim 13.
Especially, equipment according to the present invention comprises: at least one extraction mechanism that is used to extract the powder that leaves powder manufacturing apparatus; Be used to calculate the mechanism of the size-grade distribution of described powder; And processor, it is used for the size-grade distribution of described calculating and benchmark size-grade distribution relatively, and can adjust at least one operating parameter of powder production equipment, the particles of powder size that this parameter can appreciable impact be made by this powder manufacturing apparatus.
Benefit of the present invention becomes obvious at once noticing on the basis of following content: promptly regulate for the equipment of the powder that obtains to expect size-grade distribution and take place in real time with predetermined time interval basically, and do not need the labour.
Structural attitude of the present invention and advantage will become more obvious from the detailed description that the reference accompanying drawing provides, these accompanying drawings illustrate special preferred embodiment according to present device in the mode of unrestricted example.
The example that illustrates relates to atomization plant, but also is suitable for illustrating and for example relevant invention of drying and grinding of other powder manufacturing system.
Description of drawings
Fig. 1 is according to first embodiment of equipment of the present invention and the diagrammatic side view of pulverized coal preparation system;
Fig. 2 is the skeleton view of the equipment of Fig. 1;
Fig. 3 is the view of Fig. 2 of seeing from top;
Fig. 4 is the front view of Fig. 2;
Fig. 5 illustrates the cross section V-V of Fig. 3;
Fig. 6 is the zoomed-in view of the details of Fig. 5;
Fig. 7 is the zoomed-in view of the different details of Fig. 5;
Fig. 8 is according to second embodiment of equipment of the present invention and the diagrammatic side view of pulverized coal preparation system;
Fig. 9 is the view on the direction of arrow A of Fig. 8;
Figure 10 is the view on the direction of arrow B of Fig. 8;
Figure 11 is a view of seeing Fig. 8 from top.
Embodiment
Described accompanying drawing illustrates and is used for the equipment 1 of stepless control by the size-grade distribution of the powder 2 of suitable system 3 productions.
This system 3 consists essentially of known atomizer 30, processed slurry to be gone in the above-mentioned atomizer 30 by the nozzle ejection that connects feed pump 32.
On the basis of the particle size distribution numbers of the measured powder 2 in the exit of atomizer 30, operate and control the pressure that transmits slurry by feed pump 32 by equipment 1 by processor 33 and via suitable adjusting mechanism.
After slurry was processed, atomizer 30 was discharged into powder 2 on first travelling belt 34, and this first travelling belt 34 is deposited on powder 2 then and is positioned at following second and is with on 35, and this second is with 35 to be arranged to powder is sent to unshowned storage area.
Can see from figure, be used to control the equipment 1 that powder size distributes and comprise framework 4 that in framework 4 upper support extraction mechanism 5 is arranged, this extraction mechanism 5 is used to extract the powder 2 that leaves atomizer 30.Described extraction mechanism 5 comprises cylinder-piston unit 50, and the bar of this cylinder-piston unit 50 is loaded with the cup-shaped body 51 that is used to collect with analyzed powdered sample.These cylinder 50 back provide air motor 52, and the purpose of this air motor 52 is to make described main body 51 Rotate 180s °, so as with it be positioned at respectively load and exhaust position between.
With reference to Fig. 1, cylinder-piston unit 50 is being used to extract at least one progressive position of powder 2 and is being used to discharge the described cup-shaped body of translation between the retrieving position of powder 2.When being in its progressive position, main body 51 powder from 34 drop to below being positioned at be with 35 in extract powdered sample.
Especially, in moving to the process of its progressive position, the cup-shaped body oral area faces down, and only is positioned at powder waterfall when below when it, and air motor 52 just rotating main bodies 51 makes its oral area towards last.
On the contrary, when being in its retrieving position, main body 51 is positioned at conduit more than 6, and this conduit 6 is vertical in the first embodiment of the present invention and is arranged to powder 2 is sent to distributor device 7 below being positioned at.When main body 51 was positioned at its retrieving position, air motor 52 made its Rotate 180 °, drains in the conduit 6 with the powdered sample that will comprise within it.
Should be pointed out that in order to ensure the powder quantity of each sample always substantially the samely, use the scraping 53 be positioned at vertical conduit 6 fronts, its purpose is to scrape the coboundary of main body 51 to remove too much powder.Conduit 6 also supports be used for blowing compressed air two devices 54, and their purpose is airflow to be imported in the main body 51 during towards its " loaded " position translation when main body 51.The use of two hair-dryer devices 54 makes can remove any powder remnants that remain in the main body fully after the discharging of extracting powdered sample.
With reference to Fig. 6 and 7, distributor device 7 comprises the rotary valve 70 that is driven by air motor 71 (Fig. 2).Hopper 72 on this valve is used for receiving the whole powdered samples that extracted by cup-shaped body 51.This valve 70 comprises the rotating cylindrical body 73 with flat part 74 and chamber 75, and the size in this chamber 75 is suitable for only receiving the part in the described powdered sample.
Especially, when being in its retrieving position, this distributor 7 is positioned at collection plate more than 8, and the powder that distributor 7 will be received in the chamber 75 partly is deposited on this collection plate 8.
At collection plate more than 8, framework 4 supports the optical system 9 that comprises photoelectricity mechanism, is digital camera 10 in this example, is used to obtain to be deposited on the digital image of the sample of the powder 2 on the collection plate 8.
In describing example, comprise that the illuminator of circular neon lamp is associated with described camera 10, illuminate the powder on the collection plate 8, can damage the shade that receives picture quality to prevent formation.
Comprise that the suction system 12 of unshowned extraction fan is positioned at the sidepiece of collection plate 8, this suction system 12 is connected on the removable jet pipe 13 (Fig. 7) by conduit 16 (Fig. 2), this jet pipe 13 is arranged to translation above collection plate 8, so that remove powder after the photographic images at camera 10.Cylinder-piston unit 120 these jet pipes 13 of operation that support by the framework 4 of equipment.
Should be understood that conduit 16 provides removable flashboard 160, to interrupt the suction action of extraction fan.
Should be pointed out that at first when powder 2 on being deposited on 34 by atomizer 30 trends towards stratification that by advancing of suitable adjusting cup-shaped body 51, preferably at least two differences from powder waterfall extract samples.
According to second embodiment, when being in its retrieving position, main body 51 is positioned at flexible conduit more than 6 ' (Fig. 8), and this flexible conduit 6 ' is arranged to powder 2 directly is sent on the collection plate 8, and the help of the distributor 7 that in first embodiment, does not provide.
In this second embodiment (Fig. 8-11), plate 8 is supported by the structure 60 that can adjust direction; Described structure 60 is hinged on the rack beams 62 by the connected mode that is fit to, and this rack beams 62 is rigidly fixed on the framework 4 of equipment 1 by known fixed mechanism.Rack beams 62 is fixed to by described fixed mechanism and makes collection plate 8 can be positioned in apart from the predetermined height on ground on the framework 4.
Can adjust the direction of collection plate 8 by the suitable adjusting mechanism 63 that is placed between structure 60 and the beam 62, so that make described plate 8 essentially horizontally to place.
With the relative sidepiece place of sidepiece of placing conduit 6 ', described plate 8 stops with the plate 64 that tilts, the plate 64 of this inclination engages the oral area of the suction system 12 ' of known types.
This suction system 12 ' is connected to the plate 64 of inclination by flexible tubing 16 ', and this flexible tubing 16 ' stops with flashboard 160 ', and this flashboard 160 ' can open and close suction system 12 ' and managed communicating between 16 '.Extract the operation that point repeats after this to describe for each.
Originally, main body 51 is extracted powdered samples and it is poured in the conduit 6,6 ', conduit 6,6 ' transmission powdered sample are sent on the collection plate 8 in distributor 7 and from distributor 7 in first embodiment, perhaps in a second embodiment powdered sample directly are sent on the collection plate 8.
In first embodiment, distributor 7 is positioned itself on the collection plate 8 by processor 33.In case be in the appropriate location, rotary valve 70 deposits an only part of extracting sample on described collection plate 8.At this some place, processor 33 makes distributor move into its progressive position away from plate 8, and vibrator assembly 82 oscillating plates 8 are evenly to divide divided powder 2 thereon simultaneously.Interrupt the action of vibrator assembly then, and the photo of camera 10 shooting powder 2, this photograph manipulator 33 can be used.Behind photographic images, extraction fan is by removable jet pipe 13 suction powder.After sucking powder, distributor 7 is positioned on the collection plate 8 once more, so that discharge the powder of next part from identical sample.Sentence predetermined times at this point and repeat this circulation, till finishing the whole powdered samples that extract by main body 51 by analysis.
In case behind the analytic sample, processor calculates the arithmetic mean of the particle size distribution numbers that obtains.To repeating aforementioned operation from the described different samples that extract the predetermined quantity of some extraction.Processor calculates the arithmetic mean of the mean values that each sample obtains and with it and the comparison of benchmark numerical value then.On result's relatively basis, processor 33 changes the pressure of slurry feed pump 32.
In a second embodiment, do not have distributor 7 therefore just not have those related steps of distributor 7 yet, carry out like that and all the other steps of described operation cycle are foregoing.
Claims (23)
1. one kind is used for the method for size-grade distribution that the ceramic powders of powder manufacturing apparatus is left in stepless control, the step below it is characterized in that comprising at least:
Extract at least one powdered sample with predetermined space;
Measure the size-grade distribution of extracting sample;
By processor measured size-grade distribution and benchmark size-grade distribution are compared;
On the basis of measuring the difference between size-grade distribution and the benchmark size-grade distribution, adjust at least one parameter of the described powder manufacturing apparatus that influences size-grade distribution.
2. the method for claim 1 is characterized in that, the described step of measuring samples size-grade distribution comprises the size-grade distribution of the predetermined umber powder of measuring same sample.
3. method as claimed in claim 2 is characterized in that, the powder of predetermined umber whenever of same sample is calculated the arithmetic mean of measured particle size distribution numbers.
4. method as claimed in claim 2 is characterized in that, analyzes a plurality of samples, and the mean value of the average particle size distribution numerical value that will determine each sample is as measured particle size distribution numbers.
5. the method for claim 1 is characterized in that, particle size distribution measurement comprises determining of grain-size distribution curve.
6. the method for claim 1 is characterized in that, is included on the collection plate step with the described powdered sample of individual layer powder particle deposition.
7. method as claimed in claim 6 is characterized in that, comprises the step of measuring described layer by optical metrology mechanism.
8. the method for claim 1 is characterized in that, comprises handling the step of described measurement result with the curve of the size-grade distribution of acquisition expression powdered sample.
9. the method for claim 1 is characterized in that, powder manufacturing apparatus is an atomizer device.
10. method as claimed in claim 9 is characterized in that, described parameter is the ceramic size feed pressure that enters in the atomizer device.
11. the method for claim 1 is characterized in that, powder manufacturing apparatus is the drying and grinding machine.
12. method as claimed in claim 11 is characterized in that, described parameter is the rotational speed of drying and grinding machine.
13. equipment (1) that is used for stepless control by the size-grade distribution of the atomizing ceramic powders (2) of system (3) production, the mechanism (63) that comprises the size-grade distribution that is used to adjust powder, be associated with mechanism (63) and be useful at least one extraction mechanism (5) of at least one sample that extracts the powder that leaves described system (3), and the mechanism (8) of size-grade distribution that is used to measure the powder (2) of described powdered sample, it is characterized in that comprising processor (33), be used for measured size-grade distribution and benchmark size-grade distribution are compared, so that adjust at least one operating parameter of powder (2) production system (3) by adjusting mechanism (63), the size of the powder particle that this parameter can appreciable impact be produced.
14. equipment as claimed in claim 13 (1) is characterized in that, described processor (33) is determined the grain-size distribution curve of powder (2).
15. equipment as claimed in claim 13 (1), it is characterized in that, particle size distribution measurement mechanism comprises the plate (8) of at least a portion powder (2) that is used to gather described powdered sample, is provided with the optical-metrology system (10) of the image that is used to obtain described powder (2) on this plate (8).
16. equipment as claimed in claim 15 (1) is characterized in that, described optical-metrology system comprises camera (10) or video camera.
17. equipment as claimed in claim 15 (1) is characterized in that, described collection plate (8) is associated with vibrator assembly (82), and the operation of vibrator assembly (82) promotes to go up at described plate (8) the even dispersion of powder (2).
18. equipment as claimed in claim 15 (1) is characterized in that, comprises distributor device (17), is used for going up at described collection plate (8) at least a portion powder (2) of described at least one powdered sample of deposition.
19. equipment as claimed in claim 18 (1) is characterized in that, described distributor device (7) comprises rotary valve (70), is provided for receiving the hopper (72) of powder (2) on this rotary valve (70).
20. equipment as claimed in claim 19 (1) is characterized in that, described valve (70) comprise can receive by described hopper (72) the chamber (75) of only a part of powder of the powder that receives (2).
21. equipment as claimed in claim 18 (1) is characterized in that, comprises extraction mechanism (5), it is used for described powder (2) is deposited in the described distributor device (7).
22. equipment as claimed in claim 21 (1), it is characterized in that described powdered sample extraction mechanism (5) comprises the cup-shaped body (51) on the boom end that is connected to cylinder-piston unit (50) and makes the air motor (52) of described cup-shaped body (51) Rotate 180 °.
23. equipment as claimed in claim 13 (1) is characterized in that, described adjusting mechanism (63) works according to the numerical value of the slurry feed pressure of giving described system (3) at least.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITRE20030081 ITRE20030081A1 (en) | 2003-09-12 | 2003-09-12 | PLANT AND CONTINUOUS CONTROL METHOD OF |
| ITRE2003A000081 | 2003-09-12 | ||
| ITRE2004A000069 | 2004-06-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1864059A true CN1864059A (en) | 2006-11-15 |
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ID=37390843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200480029469 Pending CN1864059A (en) | 2003-09-12 | 2004-09-07 | Method for continuously controlling the particle size distribution of powders used in the ceramics industry, and plant for its implementation |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1864059A (en) |
| IT (1) | ITRE20030081A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338730A (en) * | 2011-06-20 | 2012-02-01 | 宁波广博纳米新材料股份有限公司 | Method for screening purified water used for laser particle size distribution test |
| CN102853768A (en) * | 2011-07-01 | 2013-01-02 | 中国石油化工股份有限公司 | Solid grain imaging system |
| CN102854096A (en) * | 2011-07-01 | 2013-01-02 | 中国石油化工股份有限公司 | Analysis system of solid particles and method thereof |
| CN103364315A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | On-line detection method and device for granularity of sintered solid fuels |
| CN108489872A (en) * | 2018-03-23 | 2018-09-04 | 奥星制药设备（石家庄）有限公司 | Online granularity monitoring method and system |
-
2003
- 2003-09-12 IT ITRE20030081 patent/ITRE20030081A1/en unknown
-
2004
- 2004-09-07 CN CN 200480029469 patent/CN1864059A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338730A (en) * | 2011-06-20 | 2012-02-01 | 宁波广博纳米新材料股份有限公司 | Method for screening purified water used for laser particle size distribution test |
| CN102338730B (en) * | 2011-06-20 | 2013-05-08 | 宁波广博纳米新材料股份有限公司 | Method for screening purified water used for laser particle size distribution test |
| CN102853768A (en) * | 2011-07-01 | 2013-01-02 | 中国石油化工股份有限公司 | Solid grain imaging system |
| CN102854096A (en) * | 2011-07-01 | 2013-01-02 | 中国石油化工股份有限公司 | Analysis system of solid particles and method thereof |
| CN102854096B (en) * | 2011-07-01 | 2015-09-23 | 中国石油化工股份有限公司 | Solid particle analytic system and method |
| CN103364315A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | On-line detection method and device for granularity of sintered solid fuels |
| CN103364315B (en) * | 2012-03-30 | 2016-04-06 | 鞍钢股份有限公司 | A kind of sintering solid fuel granularity online test method and pick-up unit |
| CN108489872A (en) * | 2018-03-23 | 2018-09-04 | 奥星制药设备（石家庄）有限公司 | Online granularity monitoring method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| ITRE20030081A1 (en) | 2005-03-13 |
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