CN87211407U - Dry cement grading program-controlled laser analyser - Google Patents
Dry cement grading program-controlled laser analyser Download PDFInfo
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- CN87211407U CN87211407U CN 87211407 CN87211407U CN87211407U CN 87211407 U CN87211407 U CN 87211407U CN 87211407 CN87211407 CN 87211407 CN 87211407 U CN87211407 U CN 87211407U CN 87211407 U CN87211407 U CN 87211407U
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- grading
- cement
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Abstract
The utility model discloses a dry cement grading program-controlled laser analyser, which is a device used for detecting the graininess of the cement grain. The cement powder for measuring in a special designed disperser is dispersed and forms a gas-solid flow by the function of the compressed air. The fluid is radiated by the laser, the diffraction spectrum is array photoelectric probe high-velocity sampling. The data processing is completed by the electronic computer, and the entire operation of measurement is carried out the program control by the computer. Measuring one time by the dry cement grading program-controlled laser analyser is more than 400 times faster than the sedimentation balance. The dry cement grading program-controlled laser analyser is suitable for the online grading analyse of the bulk material whose grading dispersion is between 1 to 256 micron.
Description
The utility model belongs to optical information processing and powder technology interleaving techniques field.
The grain composition of cement has significant effects to the intensity of its rate of set and cement products.
China generally adopts the cement mill sieve method to detect granularity at present, promptly measures tailing over of 80 microns square hole screens, is called fineness again.The major defect of sieve method is that repeatability is very poor, and tails over identical cement granules grating and may differ greatly, and often needs to survey specific surface area as a supplement with air permeability method.
GB GB2939-82 regulation is measured the cement granules grating and is used sedimentation balance.The major defect of sedimentation is that speed is too slow, and the more little settling time of particle is long more.Measure 1 micron particle, need three days three nights of continuous sedimentation.
Centrifugal settling method X ray sedimentation has appearred in the external nearly more than ten years, electro-induction counting method, the sreen analysis method that image analytical method etc. are advanced.Because these methods require the very high cement industry employing that also seldom is to environment for use.
The eighties, states such as English, method, U.S., moral put the diffraction-type particle size analyzer on market in succession, and this quasi-instrument is subjected to people soon with its measuring speed and pays close attention to.The domestic producer that does not also produce this quasi-instrument so far.
The subject matter of external this quasi-instrument is complex structure, costs an arm and a leg and all adopt the wet method dispersion technology, need expend liquid such as anhydrous kerosene as spreading agent, therefore still is not easy to online detection.
Development purpose of the present utility model is:
1. a kind of fast and convenient granular material dry type process for dispersing that need not to consume spreading agent is provided.
2. the sreen analysis device of monitoring the cement granules grating on a kind of available cement producing line in real time is provided.
The utility model has adopted the dry method dispersion technology in powder disperses, promptly use air as dispersion medium, utilize the Dual-Phrase Distribution of Gas olid after air and the powder, the turbulent flow of the unexpected expansion of caliber and formation reaches between particle and disperses mutually when flowing through decollator, has guaranteed that simultaneously the size composition of particle swarm is constant.Can be aided with ultrasonic generator in order to improve dispersion efficiency.Dual-Phrase Distribution of Gas olid after disperseing forms a particle swarm thin layer and accepts measurement before seam formula nozzle.
The utility model adopts the information optics technology to combine with electronic computer technology in particle sizing rely on to measure cement granules group's laser diffraction to compose the size-grade distribution of analyzing its particle.All operation realizes programmed control.
The utility model all device is made up of four parts, sees Fig. 1.(1)-(6) be to measure the power spectrum of particle swarm for its major function of optical system; (7) be electronic amplification system, its major function is with power spectrum amplification and digitizing and sends into microcomputer; (8)-(9) be the data handling system that robot calculator and printer are formed, system is carried out programmed control.(10)-(16) be sampling of dry type powder and dispersant system.The principle of work of four systems is with details are as follows with technical requirement:
Optical system is by laser instrument (1); Beam expanding lens (2); Pinhole filter (3); Collimation lens (4); Fourier transformation lens (5); Form with array optical electric probe (6).
Light source adopts helium-neon gas laser, sends red light wavelength 6328
, output rating 2-5 milliwatt.Laser becomes it strict plane wave by collimating mirror and impinges upon on the particle of testing sample after expanding bundle and High frequency filter, converged on the back focal plane by the Fourier transformation lens by the light beam of particle diffraction, obtains the diffraction pattern of particle swarm.67 unit light electric explorers on the back focal plane receive the power spectrum of diffractogram, and are converted into electric signal.
Pay the upright leaf focal length of lens and decide on the topped scope of the power spectrum of measured object, can adopt 300 millimeters to cement, the pinhole filter aperture is 10 microns.The home market has finished product to sell.Array optical electric explorer, each cell distribution see that Fig. 2 .32 semi-circular unit is used for surveying the radial distribution of diffractogram.32 wedge-like unit are used for surveying the angle distribution of diffractogram.In order to center, be provided with the four-quadrant probe unit at the detector center, 1,2 quadrants connect the back as the annular detector first module, Unit totally 67.
This detector optical property:
Responsiveness 0.2mA/mW(6328
)
Cell response homogeneity＜± 15%
Dark current＜0.1 μ A
Saturation current＞1.7mA
Dynamic range 1-10
4
Response time 20-200 μ S
Oppositely withstand voltage＞5V
The serial connection factor＜1%(electrical method)
The function of electronic amplification system (7) is that the photosignal that array optical electric explorer OD obtains is sent into Apple II computing machine through amplifying with analog to digital conversion, and the hardware logic diagram of native system is seen Fig. 3.
I/V1-67 is 67 road current/voltage switching amplifiers, and it can be converted to the photocurrent of array optical electric explorer OD output milliampere magnitude voltage signals and amplify.
Sampling holder p1-67 can keep 67 road voltage signals simultaneously, so that handle successively.Sampling is triggered by dual mode: selector switch K1 places a, by sending out trigger pip C in the machine
4K1 places b, then by button n, by the machine external trigger.D is a driver.
The routing control signal C that multicircuit switch K sends according to computing machine
3, taking out one the tunnel for handling at every turn, T is a code translator, its effect is that machine code is converted to control signal.
Automatic variable journey circuit M selects 1,2,4,8 times of different range automatically according to the size of acquired signal, and ratio signals S is sent into computing machine.The automatic range control signal C that the action of M is sent by computing machine
2Control.
A/D is 12 analog to digital converters, and the numerical signal after the conversion is sent into computing machine and carried out data processing.The action of A/D is by the control signal C of computing machine output
1Control.
The control program block diagram of native system is shown in Fig. 5.
Computing machine (3) data processing is selected apple two E type machines (Apple II e) for use.
The major function of data processing software is that the diffraction power spectrum with particle swarm is converted to grain composition, supplies with production line control system by printer output or the feature level signal of exporting a characterizing particles size and uses.
The data processor block diagram is seen Fig. 4.
Program run begins at first the diffraction spectra of powder and background to be sampled respectively.Need carry out data and give processing in order to eliminate disturbing factor.Can directly from the sample diffraction spectra, remove for the dust diffraction in the background.For the high frequency region power spectrum reversal development that larger particles forms the covering of dust, need determine the background coefficient according to the degree that hides.Can adopt normalization to eliminate it for the fluctuation of laser output power and the interference of granule density fluctuating.Cross term noise for the coherent optics system can adopt suitable window filtering function to carry out smooth operation, and depth of smoothness WK will take into account the requirement of level and smooth result's resolution and stable two aspects, and suggestion WK chooses 3 or 5.
Muting diffraction spectra can be thought through level and smooth data, sreen analysis can be used for carrying out.
The main method of data processing is the curve fitting under the least square meaning.Its flow chart is seen Fig. 4.
The diffraction model of particle, the program special according to the former reason of physical optics produces, and deposits the eigenmatrix database in, takes during in order to data processing.
This routine processes particle size range 1-256 micron is divided into 16 grades, and distribution of particles can be selected two kinds of models for use, and a kind of is the lognormal distribution model, and a kind of is Rosin---and La Mule (Rosin-Rammiler) distributes.
Computer Processing result, by the following content of computer printout:
1. gradation interval;
2. weight percentages at different levels;
3. the value of tailing over or the accumulated value of this grade particles upper limit particle diameter;
4. tail over is 50% the particle diameter X50 or the mathematical expectation E of particle diameter;
5. the profile exponent N of particle or the distribution variance C of particle;
6. the precision Q of curve fitting;
7. draw grain-size distribution curve;
8. draw and tail over curve or summation curve;
9. distribute for R-R and give fineness value R80;
10. provide 3-30 micron particles percentage by weight.
The sampling of granular material and dispersant system be by feeding device (10), dispensing device (11), and diverting device (12), nozzle (13), sample cell (14), tripping device (15) and exhaust blower (16) are formed.See Fig. 1.
Powder adds in the dispensing device (11) equably through vibration or spiral feeding device (10) after the production line sampling, mixes forming Dual-Phrase Distribution of Gas olid with pressurized air at this, blows to diverting device (12).The diverting device main body is a barrel-shaped decollator, and its internal diameter (D) is 5-8 with the ratio of inlet caliber (d), sees (A) of Fig. 6.When Dual-Phrase Distribution of Gas olid entered decollator, because the rapid expansion of volume and be subjected to turbulent flow, particle was disperseed.Can be for improving dispersion efficiency with ultrasonic generator as auxiliary.Powder through disperseing is seam formula nozzle (13) ejection of 1-2 millimeter from width, and seam formula nozzle sees that the powder of (B) ejection of Fig. 6 enters sample cell (14).Sample cell is the flat cavity that an organic glass is made.See Fig. 7, having diameter on its sidewall is the coaxial circular hole of 20-30 millimeter, and collimated laser beam sees through thus.For avoiding powder from the hole, to overflow, adopt exhaust blower (16) in sample cell, to cause negative pressure, powder is drawn into cyclone separator (15) powder separates the back and discharge from the bottom, air is then sent into the workshop airduct that gathers dust by the upper pipe exhaust blower.
The utility model also can be tested static sample.As long as will adhere to the glass plate of sample powder during test inserts in the light path sample cell (14) and locates the measurement of can starting shooting.
The utility model method of operating:
1. open laser power supply
2. operation detector centering display routine is regulated probe positions to center and optical axis coincidence
3. service data handling procedure, particle and agranular background are waited for three to five minutes after sampling respectively to having, printer is promptly printed result of calculation by the prompting of screen.
4. on-line measurement continuously can realize programmed control, and every interval certain hour is printed results of grain size analysis and exported a level signal that characterizes granule size, uses for production control.
The utility model has been compared following advantage with the sreen analysis method that China adopts at present:
1. detection speed is fast, prints the result and only needs a few minutes from sampling, and is faster more than 400 times than sedimentation balance.
2. automated procedures height, all operation does not need the people to participate in substantially, the minimum that the artificial interference factor is subtracted.
3. applied range all can be measured for the granular material of all 1-256 microns, is not subjected to the restriction of its physicochemical property.
The utility model with compared following important difference with quasi-instrument abroad
1. all adopt homemade former device, make to give and estimate the 1/5-1/10 that cost is reduced to external instrument price.
2. simple in structure, there is not mechanical running gear, maintenance is easily.
3. adopt strength to disperse, need not consume spreading agents such as anhydrous kerosene in the use.
4. adopt the signal retainer, make 67 detection units accomplish the synchronous high-speed sampling, improved the measuring accuracy of dynamic sample.
5. adopted a series of special Anti-Jamming Techniques, when guaranteeing measurement stability, reduced requirement environment for use, can be in the indoor use of Shop floor control.
The utility model is tested the French cement sample that Beijing building materials research institute cement is provided.This sample is the shared sample of 85-86 international granularity Detection of year.190 units in countries in the world that have that take one's test wherein use 26 units that have of laser particle analyzer.China Beijing building materials research institute has participated in test comparison and has been numbered NO142.Test result sees Table 1.
First hurdle is the particle grain size scope in the table: second hurdle is 26 unit testings mean values as a result in the table, represents with percentage by weight.Third column F715 is the graduate results of Beijing building materials, and the 4th hurdle pSA is the utility model test result.
Test result of the present utility model is as can be seen from Table 1 compared very approaching with the international average value.
Claims (6)
1, a kind of dry method is disperseed the program control laser analysis device of cement granularity, by sampling of dry type powder and dispersant system, optical system, electronic amplification system and data handling system are formed, it is characterized in that sampling and send into a diverting device of forming by decollator (12) and nozzle (13) after with dispersant system a compressed air mixed of feeding device (10) that receives the dryness granular material being arranged, enter one again and be contained in acceptance parallel light-struck sample cell (14) between collimation lens (4) and the Fourier transformation lens (5), and optical system, photosignal amplification system and an A/D converting system that detects particle swarm diffraction power spectrum arranged.
2, according to the described laser analysis device of claim (1), it is characterized in that, is by reinforced (10) in the sampling of formula powder with dispersant system, dispensing device (11), diverting device (12), nozzle (13), sample cell (14), tripping device (15) and exhaust blower (16) are formed.
According to the described laser analysis device of claim (2), it is characterized in that 3, diverting device (12) is one barrel-shaped, its internal diameter is 5-8 with the ratio of inlet caliber.
4, it is characterized in that according to the described laser analysis device of claim (2) slit of nozzle (13) is the 1-2 millimeter.
According to the described laser analysis device of claim (2), it is characterized in that 5, sample cell (14) is the flat cavity that an organic glass is made.
According to the described laser analysis device of claim (2), it is characterized in that 6, having diameter on the sample cell (14) is the coaxial circular hole of 20-30 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87211407 CN87211407U (en) | 1987-08-03 | 1987-08-03 | Dry cement grading program-controlled laser analyser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87211407 CN87211407U (en) | 1987-08-03 | 1987-08-03 | Dry cement grading program-controlled laser analyser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87211407U true CN87211407U (en) | 1988-07-06 |
Family
ID=4826224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87211407 Withdrawn CN87211407U (en) | 1987-08-03 | 1987-08-03 | Dry cement grading program-controlled laser analyser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87211407U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615074A (en) * | 2015-02-02 | 2015-05-13 | 响水中联水泥有限公司 | Intelligent control system and method for cement grinding |
| CN105785942A (en) * | 2014-12-26 | 2016-07-20 | 中国二十冶集团有限公司 | Grouping and combined debugging method for large-scale dry method cement decentralized control system |
| CN107782645A (en) * | 2017-12-12 | 2018-03-09 | 海宁智测光电科技有限公司 | A kind of gas-solid rolling particles particle diameter on-line measurement apparatus and method |
-
1987
- 1987-08-03 CN CN 87211407 patent/CN87211407U/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105785942A (en) * | 2014-12-26 | 2016-07-20 | 中国二十冶集团有限公司 | Grouping and combined debugging method for large-scale dry method cement decentralized control system |
| CN105785942B (en) * | 2014-12-26 | 2018-09-14 | 中国二十冶集团有限公司 | Large-scale cement produced with the dry method scattered control system packet joining adjustment method |
| CN104615074A (en) * | 2015-02-02 | 2015-05-13 | 响水中联水泥有限公司 | Intelligent control system and method for cement grinding |
| CN104615074B (en) * | 2015-02-02 | 2017-03-22 | 响水中联水泥有限公司 | Intelligent control system and method for cement grinding |
| CN107782645A (en) * | 2017-12-12 | 2018-03-09 | 海宁智测光电科技有限公司 | A kind of gas-solid rolling particles particle diameter on-line measurement apparatus and method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |