CN109374665B - Automatic sampling type online X fluorescence analysis device for cement raw materials - Google Patents
Automatic sampling type online X fluorescence analysis device for cement raw materials Download PDFInfo
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- CN109374665B CN109374665B CN201811491984.2A CN201811491984A CN109374665B CN 109374665 B CN109374665 B CN 109374665B CN 201811491984 A CN201811491984 A CN 201811491984A CN 109374665 B CN109374665 B CN 109374665B
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- 239000000463 material Substances 0.000 claims abstract description 211
- 230000007246 mechanism Effects 0.000 claims abstract description 116
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/223—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/2204—Specimen supports therefor; Sample conveying means therefore
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- Analysing Materials By The Use Of Radiation (AREA)
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Abstract
The invention discloses an automatic sampling type cement raw material online X fluorescence analysis device which comprises a sampling mechanism for micro sampling, a receiving mechanism for quantitative sampling, an X fluorescence measurement mechanism for element component analysis and a cleaning mechanism for cleaning and discharging ash. The invention uses the micro spiral reamer to sample micro amount of raw material in a constant speed from the raw material chute; the sampling quantity is controlled by a receiving mechanism with a two-stage material level sensor and a two-stage flashboard, so that quantitative sample feeding of an X fluorescence measuring mechanism is realized; re-discharging the remainder and the sample back to the raw material chute by using a pneumatic conveyor; the whole device runs continuously and circularly, so that the sample quantity used for the online X-ray fluorescence measurement mechanism is stable, and the timeliness and the representativeness of the sample are high.
Description
Technical Field
The invention relates to the field of on-line detection of industrial material components, in particular to an on-line X-ray fluorescence analysis device for cement raw materials.
Background
Cement raw materials are important source links in cement production, and in the cement production process, the cement raw materials determine the product quality of cement clinker to a great extent, so that the economic benefit of enterprises is affected. The production of cement raw material is composed of four technological links of mine exploitation, raw material pre-homogenizing storage yard, raw material grinding and raw material homogenizing storage, after raw materials such as limestone and clay are ground by raw material grinding machine, loose fine powder raw material is formed, the raw material is in suspension state and is conveyed to raw material homogenizing storage along pipeline by means of air conveying chute driven by air flow of fan, and then is calcined in kiln to form cement clinker, so that in order to produce high-quality clinker, ensure cement quality, it is important to high-efficiency control of three-rate value (LSF, SM, IM) and stability of raw material quality.
X-ray fluorescence spectroscopy (X-ray fluorescence analysis, XRF) is simply referred to as X-fluorescence analysis, which is to measure the characteristic X-ray radiated by the element of the sample after being excited, and quantitatively and qualitatively analyze the element in the sample according to the energy and intensity of the characteristic X-ray. The X fluorescence analysis equipment has low cost, does not need to adopt a radioactive source, can meet the optimal radiation safety requirement, is widely and ripely applied in the cement industry, and particularly, the quality control system of a sampler, an X fluorescence analyzer and manual ingredients is commonly adopted in the quality control of the grinding raw materials by cement enterprises. With the development needs of intelligent industry, the online detection technology can improve quality monitoring big data for industrial processes to be more and more valued by cement industry, so that the application of the X-fluorescence analysis technology to online detection of cement raw materials has a good application prospect.
However, the conventional X-fluorescence analyzer in the cement industry depends on manual participation, so that the conventional X-fluorescence analyzer is difficult to directly use for on-site real-time on-line analysis, firstly, manual sampling, shrinkage, grinding, sample pressing and X-fluorescence analysis are generally required until the analysis result is at least 30min, time and effort are required, and the detection result is delayed.
Secondly, X-fluorescence analysis has strict requirements on sample quantity or sample thickness in powder sample analysis, proper sample quantity and stable material quantity are required, the sample thickness formed by material quantity waveguides is different, the caused matrix effect degree is different, and further fluctuation of X-fluorescence intensity is caused, so that the stability and accuracy of an online X-fluorescence analysis result are influenced. Therefore, if the X-ray fluorescence analysis system is applied to the online analysis of cement raw materials, the problems of quantitative sample feeding and automatic sample cleaning are simultaneously required to be solved.
Disclosure of Invention
The invention provides an automatic sampling type cement raw material online X-ray fluorescence analysis device which can realize automatic sampling, quantitative sample feeding, X-ray fluorescence measurement and sample cleaning of cement raw materials online and solves the problems of dependence on manpower and aging hysteresis in the traditional cement laboratory X-ray fluorescence analysis process.
The invention adopts the following technical scheme:
an automatic sampling type online X fluorescence analysis device for cement raw materials comprises a sampling mechanism, a receiving mechanism, an X fluorescence measurement mechanism and a material cleaning mechanism; the sampling mechanism is used for uniformly and slightly collecting raw material samples from an air conveying chute at the rear end of the cement raw material mill; the receiving mechanism is used for judging the sample amount, quantitatively sampling and feeding the sample to the X fluorescence measuring mechanism; the X fluorescence measurement mechanism is used for analyzing the elemental composition of the cement raw material; the material cleaning mechanism is used for discharging the residual materials in the material receiving mechanism and the measured samples in the material cup back to the air conveying chute; the sampling mechanism intermittently and continuously samples and synchronously operates with the X fluorescence measuring mechanism, the receiving mechanism is used for quantitatively sampling and feeding samples to the X fluorescence measuring mechanism, the sample amount of the X fluorescence measuring mechanism is ensured to be stable all the time, and the material clearing mechanism is used for re-discharging redundant materials in the receiving mechanism and measured samples in the material cup into the air conveying chute, so that the clean and no-residual materials in the device are ensured, and the on-line analysis of cement raw materials is realized.
The automatic sampling type cement raw material online X fluorescence analysis device comprises a speed reducing motor 1 and a spiral reamer 2 driven by the speed reducing motor, wherein the sampling mechanism is arranged on the side face of an air conveying chute 25 at the upstream section behind a raw material grinder and is used for continuously sampling in a small number of repeated circulation modes.
The automatic sampling type cement raw material online X fluorescence analysis device is characterized in that the gear motor 1 can work in a forward and reverse mode, the forward rotation is used for sampling and discharging, the forward rotation is used for driving the spiral reamer 2 to take out raw material samples in the air conveying chute 25 at a constant speed, the time of each forward rotation is fixed, the number of times of forward rotation in one sampling period is provided with an upper limit, the feedback of the number of times exceeding the upper limit is not full, the device is finished, and the reverse rotation of the gear motor 1 is used for driving the spiral reamer sampler 2 to discharge materials in reamer threads.
The automatic sampling type cement raw material online X fluorescence analysis device is characterized in that the rotating speed of an output shaft of the speed reducing motor 1 is not more than 25r/min; the spiral reamer 2 consists of a screw and an outer sleeve, the rear end of the outer sleeve is fixed with a flange of the gear motor 1 and is provided with a discharge hole close to the flange, and the discharge hole is vertically downward, so that raw materials can vertically fall down along a blanking pipeline 4.
The length of the screw rod horizontally penetrating into the air conveying chute 25 from the middle lower part of the side surface is not more than 300mm, and the screw depth of the screw rod is not less than 5mm; the gap between the outer sleeve and the screw is not more than 2mm, and the front end of the outer sleeve is provided with a feed chute with the length not less than 100mm and the width not less than 15mm.
The automatic sampling type cement raw material online X fluorescence analysis device comprises a material receiving electric ball valve 3, a blanking pipeline 4, an upper glass tube 5, an upper vent valve 6, a lower glass tube 7, an upper telescopic flashboard 8, an upper material level sensor 9, a lower telescopic flashboard 10, a lower material level sensor 11, a lower vent valve 13, a material cup 14 and a measuring window 15; the material receiving electric ball valve 3 is in a normally closed state, is arranged between the spiral reamer sampler 2 and the blanking pipeline 4, and is opened when the sampling mechanism executes sampling action; the middle part of the blanking pipeline 4 is connected with the material cleaning mechanism in a sealing way, and the bottom of the blanking pipeline 4 is connected with the upper glass tube 5 in a sealing way; the upper telescopic flashboard 8 and the lower telescopic flashboard 10 comprise stainless steel sheets with round holes and sealed shells driven by telescopic cylinders, wherein the upper telescopic flashboard 8 is in a normally open state, the lower telescopic flashboard 10 is in a normally closed state, the upper telescopic flashboard 8 is closed when receiving materials fully, and the lower telescopic flashboard 10 is opened when feeding samples to the X fluorescence measuring mechanism 23.
The automatic get online X fluorescence analysis device of style cement raw meal, last flexible flashboard 8 with lower flexible flashboard 10 structure the same, by flexible cylinder driven take the stainless steel sheet of round hole and seal shell to constitute, wherein go up flexible flashboard 8 and be in normally open state, flexible flashboard 10 is in normally closed state down, go up flexible flashboard 8 when receiving the material full, flexible flashboard 10 is opened down when giving the material cup 14 that X fluorescence measurement was used for giving the appearance.
The automatic style taking type cement raw material online X fluorescence analysis device comprises a lower telescopic flashboard 10, a lower telescopic flashboard and a top plate, wherein the lower telescopic flashboard 10 comprises an upper sealing cover plate 26, a lower sealing cover plate 27, an O-shaped ring 28, a stainless steel sheet 29, a connecting structure 30, a telescopic cylinder 31 and a telescopic flashboard bracket 32; wherein the upper sealing cover plate 26 and the lower sealing cover plate 27 are provided with mounting grooves of O-shaped rings, the centers of the upper sealing cover plate and the lower sealing cover plate are provided with through holes, and sinking grooves are reserved at the peripheries of the through holes and are used for being connected with a transition tube seat at the bottom end of the lower glass tube 7; the stainless steel sheet 29 is a 304 stainless steel sheet with mirror polishing surface and is provided with a blanking hole 33, the stainless steel sheet 29 is fixed with a telescopic air cylinder 31 through a connecting structure 30, the forward and backward movement of the stainless steel sheet 29 with the blanking hole is driven by the movement in the stroke of the telescopic air cylinder 31 so as to control a blanking switch in the material receiving process, and the telescopic air cylinder 31 is a mini stainless steel telescopic air cylinder, is connected with compressed air and is fixed on a telescopic flashboard bracket 32.
The automatic sampling type cement raw material online X fluorescence analysis device is characterized in that the feeding level sensor 9 and the discharging level sensor 11 are diffuse reflection type or correlation type photoelectric sensor switches; the feeding level sensor 9 is arranged at the bottom of the upper glass tube 5, and triggers a full signal when the level height in the upper glass tube 5 reaches the position of the feeding level sensor 9; the blanking level sensor 11 is installed at the bottom of the lower glass tube 7, and when the lower telescopic flashboard 10 is opened to enable a sample in the lower glass tube 7 to fall into a lower material cup, a material empty signal is triggered if the blanking level sensor 11 detects that no material exists in the lower glass tube 7.
The automatic sampling type cement raw material on-line X fluorescence analysis device is characterized in that the upper glass tube 5 and the lower glass tube 7 are transparent quartz or organic glass tubes, wherein the upper glass tube 5 is used for being matched with the upper material level sensor 9 and the upper telescopic flashboard 8 to monitor the material level, and the pipe diameter and the height of the lower glass tube 7 are fixed and used for accommodating a fixed amount of samples.
The automatic sampling type cement raw material online X fluorescence analysis device is characterized in that the bottom of the upper glass tube 5 is provided with 1 air tap, the air tap is of an upward inclined thin tube structure and is respectively communicated with the upper vent valve 6 and the pneumatic electromagnetic valve group 18 through a three-way structure, the upper vent valve 6 is in a normally open state, the inside of the receiving mechanism is communicated with the outside atmosphere in the sampling process, when the blanking is smooth and the residual material cleaning action is executed, the upper vent valve 6 is switched and communicated with compressed air from the compressed air source 19, the bottom of the upper glass tube 5 is blown, the materials are blown away, and the residual materials above the upper telescopic flashboard 8 are carried out by the high-speed air flow generated by the residual material pneumatic conveyor 17 and are discharged into the air conveying chute 25 along the blanking pipeline 4 and the ash discharging pipeline 24.
The automatic sampling type cement raw material online X fluorescence analysis device is characterized in that the material cup 14 is of a tubular structure with hydrophobic inner wall, the inner diameter is 2 to 4 times that of the lower glass tube 7, the height is not less than 25mm, the upper part of the material cup is provided with 1 material cup upper air tap 35, the material cup upper air tap is connected with the lower air vent valve 13, the material cup upper air tap is communicated with the atmosphere in a normally open state, the middle part of the material cup upper air tap is provided with a sample cleaning port communicated with the pipeline of the material cleaning mechanism, the opposite side of the sample cleaning port is provided with a vibrator 12 for tightly enabling materials in the cup to be compact, the lower part of the material cup 14 is uniformly provided with a plurality of material cup blowing air taps 37, the material cup blowing air taps are connected with a plurality of electromagnetic valves 18 in a normally closed state, when sample cleaning action is executed, compressed air is simultaneously opened and blown to the bottom of the material cup 14 through the air taps in a plurality of directions, the piled samples are blown off and the inner wall is blown, the bottom of the material cup 14 is connected with a measuring window 15, and the measuring window 15 comprises a window film fixing ring 38 and a window film 39 of a high polymer material.
The automatic sampling type cement raw material online X fluorescence analysis device comprises a material cleaning mechanism, a material cleaning mechanism and a control mechanism, wherein the material cleaning mechanism comprises a residual material electric ball valve 16, a residual material pneumatic conveyor 17, a pneumatic electromagnetic valve group 18, a compressed air source 19, a sample cleaning electric ball valve 20, a sample cleaning pneumatic conveyor 21 and an ash discharge pipeline 24; the ash discharge pipeline 24 is connected into the raw material zipper machine of the air conveying chute 25, and the waste pneumatic conveyor 17, the sample cleaning electric ball valve 20 and the sample cleaning pneumatic conveyor 21 of the waste electric ball valve 16 are arranged on the ash discharge pipeline 24 in series, and the waste electric ball valve 16 and the sample cleaning electric ball valve 20 are in a normally closed state and are used for isolating the influence of air flow in the air conveying chute 25.
The automatic sampling type cement raw material online X fluorescence analysis device is characterized in that a residual material electric ball valve 16 and a residual material pneumatic conveyor 17 in a material cleaning mechanism are used for executing residual material discharging actions in an upper glass tube 5, a sample cleaning electric ball valve 20 and a sample cleaning pneumatic conveyor 21 are used for sample cleaning actions in a material cup 14, and the residual material discharging actions and the sample cleaning actions in the material cleaning mechanism are interlocked and cannot be operated at the same time, wherein the sample cleaning actions are priority.
The automatic sampling type cement raw material online X-ray fluorescence analysis device is characterized in that the X-ray fluorescence measurement mechanism 23 adopts an upper illumination type, and samples at the bottom of the material cup 14 are measured through the measurement window 15; the distance between the X fluorescence measuring mechanism 23 and the measuring window 15 is not more than 10mm, helium flow can be conducted between the X fluorescence measuring mechanism and the measuring window; when the X-ray fluorescence measuring mechanism 23 starts to perform measurement, the sampling mechanism synchronously performs sampling action; the lower vent valve 13 and the lower retractable shutter 10 are kept closed during the measurement performed by the X-ray fluorescence measuring mechanism 23.
The invention has the following beneficial effects:
the invention relates to an automatic sampling type online X fluorescence analysis device for cement raw materials, which realizes online automatic sampling, quantitative sample feeding, element component measurement and automatic sample cleaning of the ground cement raw materials, and solves the problems of manual dependence on a traditional laboratory, result lag and poor sampling representativeness;
the invention uses the miniature spiral reamer driven by the gear motor to continuously sample the cement raw material from the air conveying chute for a plurality of times at a constant speed, thereby ensuring the controllable blanking speed and strong timeliness and representativeness of sampling.
According to the invention, the sample feeding quantity is controlled by utilizing the glass tube with fixed volume, the two-stage material level sensor and the two-stage flashboard, so that the influence of material quantity fluctuation on X fluorescence intensity is reduced, and the X fluorescence detection precision is improved;
the invention adopts the mode of receiving and preparing samples in the sealed pipeline, has compact structure and simple installation and disassembly, and is matched with a material cleaning mechanism adopting pneumatic cleaning, so that the interior of the material receiving mechanism is clean;
the window film with high mechanical strength and high X-ray transmittance is adopted, so that the high X-ray transmittance is ensured, and the window and the periphery are kept clean by combining a cleaning and blowing mechanism;
the invention adopts the X fluorescence measuring machine, adopts the upper illumination type measuring material cup with a flat material surface at the bottom, and reduces the error caused by uneven material;
the communication mode adopted by the invention is convenient for docking with a main control system of a cement plant, and is beneficial to realizing automatic batching of guiding raw material components by combining a batching system.
Drawings
FIG. 1 is a schematic diagram of an on-line X-ray fluorescence analysis device for automatically taking a model of cement raw materials;
FIG. 2 is a logic diagram of the operation of an on-line X-ray fluorescence analysis device for automatically taking a model of cement raw materials in an embodiment of the invention;
fig. 3 is a front view of a telescopic shutter structure in an embodiment of the present invention;
FIG. 4 is a top view of a telescoping ram structure in an embodiment of the invention;
FIG. 5 is a schematic view of the structure of an upper glass tube according to an embodiment of the present invention;
FIG. 6 is a schematic view of a cup structure according to an embodiment of the present invention;
FIG. 7 is a graph of the fluorescence measurement of raw meal component X in an example of the present invention.
1: a speed reducing motor; 2: a spiral reamer sampler; 3: receiving an electric ball valve; 4: a blanking pipeline; 5: a glass tube is arranged; 6: an upper vent valve; 7: a lower glass tube; 8: an upper retractable flashboard; 9: a loading level sensor; 10: a lower telescopic flashboard; 11: a blanking level sensor; 12: a vibrator; 13: a lower vent valve; 14: a material cup; 15: a measurement window; 16: electric ball valve for remainder material; 17: pneumatic conveyer of the surplus material; 18: pneumatic electromagnetic valve group; 19: a compressed air source; 20: sample-cleaning electric ball valve; 21: a sample removal pneumatic conveyor; 22: a PLC system; 23: an X-ray fluorescence measurement mechanism; 24: an ash discharge pipe; 25: an air delivery chute; 26: an upper sealing cover plate; 27: a lower sealing cover plate; 28: an O-ring; 29: stainless steel sheet; 30: a connection structure; 31: a telescopic cylinder; 32: a telescopic flashboard bracket; 33: a blanking hole; 34: a material cup fixing structure; 35: an air tap is arranged on the material cup; 36: a sample clearing port of the material cup; 37: blowing an air tap by a material cup; 38: a window film fixing ring; 39: window film.
Detailed Description
The present invention will be described in detail with reference to specific examples.
In the description of the present invention, it should be noted that, unless explicitly specified and defined otherwise, the term "X-fluorescence" may be understood as a characteristic X-ray fluorescence based on an analysis method of X-ray fluorescence and an element being excited, as the case may be, and the specific meaning of the above term in the present invention may be understood by one of ordinary skill in the art as the case may be; "upper", "middle", "lower" and "front", "rear" are all based on the description of the positions of the objects in the drawings; "upstream" and "downstream" are referenced to the direction of transport of the cement raw meal in the chute.
As shown in FIG. 1, the invention discloses an automatic sampling type online X-ray fluorescence analysis device for cement raw materials, which comprises a sampling mechanism, a receiving mechanism, an X-ray fluorescence measurement mechanism and a material cleaning mechanism. The sampling mechanism, the receiving mechanism and the X fluorescence measuring mechanism are sequentially arranged from top to bottom; the sampling mechanism intermittently and continuously samples and synchronously operates with the X fluorescence measuring mechanism, so that good timeliness and strong representativeness of samples used for the online X fluorescence measuring mechanism are ensured; the material receiving mechanism is used for quantitatively sampling and feeding samples to the X fluorescence measuring mechanism, so that the sample amount of the X fluorescence measuring mechanism is ensured to be stable all the time, the influence of a matrix effect is reduced, and the measurement stability is improved; the material cleaning mechanism discharges the redundant materials in the material receiving mechanism and the measured samples in the material cup back to the air conveying chute, so that the cleanness and no redundant materials in the device are ensured.
The sampling mechanism comprises a gear motor 1 and a spiral reamer sampler 2 connected with a main shaft of the gear motor 1, wherein the gear motor 1 is a WB85-LD-59-250 miniature cycloidal needle type gear motor, the reduction ratio is 1:59, the torque is 60 N.m, and the rotation speed of an output shaft is 23r/min; the spiral reamer sampler 2 comprises an outer sleeve and a screw, the diameter of the screw is 30mm, the screw is fixedly connected with a main shaft of the gear motor 1, the thread distance is 6.5mm, the thread groove depth is 5mm, the diameter of the outer sleeve is 42mm, the length of the outer sleeve is 400, the clearance between the outer sleeve and the screw is 1mm, the front end of the outer sleeve is provided with a feeding hole with the length of 120mm and the width of 18mm, the feeding hole is opposite to the feeding direction of the air conveying chute 25, the rear end of the outer sleeve is fixed with a flange of the gear motor 1 and is provided with a discharging hole at a position close to the flange, the discharging hole is vertically downward, and the discharging hole is connected with a material receiving mechanism below the lower part through a sanitary stainless steel pipeline.
The sampling mechanism is arranged on the side surface of an air conveying chute 25 at the upstream section behind the raw material mill, samples continuously in a small amount of repeated circulation mode, drives a screw rod of a spiral reamer sampler 2 to rotate forward at a constant speed through the forward rotation of a main shaft of a speed reducing motor 1, brings raw materials in the air conveying chute 25 entering a feed inlet at the front end of an outer sleeve of the spiral reamer sampler 2 to the rear end of the outer sleeve, and is provided with a vertically downward discharge hole at the rear end of the outer sleeve, and the raw materials fall into a receiving mechanism below through the discharge hole;
the air conveying chute 25 is positioned at the rear end of the raw material mill, the width of the air conveying chute 25 is 500mm, the height of the air conveying chute is 300mm, the downward inclination angle is about 7 degrees, a hole with the diameter of 50mm is formed in the position 70mm below the center of the side surface of the air conveying chute 25, a flange is welded, a sampling mechanism is arranged on the side surface of the chute by virtue of the flange structure, and the length of the spiral reamer sampler 2, which penetrates into the air conveying chute 25, is 250mm; the gear motor 1 drives the spiral reamer sampler 2 to drive the raw material sample in the air conveying chute 25 at a constant speed, the sampling mechanism samples in a small amount of multiple times, the sampling mechanism samples for multiple times in a single sampling period, the upper limit of the forward rotation is 5 times, the interval (delay) is 2s, the single forward rotation time is 30s, the feedback material is not fully taken and the device is finished to operate, and when the sampling is fully carried out, the gear motor 1 drives the spiral reamer sampler 2 to reversely rotate so that the material in the reamer thread gap is discharged into the air conveying chute 25 through a feed inlet at the front end of the outer sleeve and waits for entering the next sampling period.
The receiving mechanism comprises a receiving electric ball valve 3, a blanking pipeline 4, an upper glass tube 5, an upper ventilation valve 6, a lower glass tube 7, an upper telescopic flashboard 8, an upper material level sensor 9, a lower telescopic flashboard 10, a lower material level sensor 11, a vibrator 12, a lower ventilation valve 13, a material cup 14 and a measuring window 15; the material receiving electric ball valve 3 is an electric ball valve with feedback signals of KLD200-DN32 type sanitary stainless steel straight-through, is in a normally closed state and is arranged between a discharge hole of an outer sleeve of the spiral reamer sampler 2 and a blanking pipeline 4; the blanking pipeline 4 is a sanitary stainless steel pipe, the diameter of the pipe at the top end is smoothly changed through the large end and the small end of the sanitary stainless steel pipe for 4 times, the outer diameter of the pipe at the top end is phi 32mm, the middle part is phi 25 and phi 19mm, the bottom part is phi 15mm, the sanitary stainless steel pipe at the bottom part is in sealing connection with the upper glass pipe 5 through a transition base structure with an O-shaped ring in an inner slot, and the phi 25mm pipe at the middle part of the blanking pipeline 4 is sequentially communicated with the ash discharge pipeline 24, the residual pneumatic conveyer 17 and the residual electric ball valve 16 through a quick-connection tee structure.
The material receiving mechanism is used for quantitatively sampling and feeding samples to the X fluorescence measuring mechanism, raw materials entering the material receiving mechanism sequentially fall into the lower glass tube 7 along the material falling pipeline 4, the upper glass tube 5 and the upper telescopic flashboard 8, as the lower telescopic flashboard 10 connected to the bottom of the lower glass tube 7 is normally closed, raw materials are continuously piled up in the lower glass tube 7, when the piled height exceeds the upper telescopic flashboard 8 and reaches the position of the material feeding position sensor 9, the upper telescopic flashboard 8 is closed, so that a fixed volume of raw materials is packaged in the lower glass tube 7, redundant raw materials above the upper telescopic flashboard 8 are discharged into the air conveying chute 25 along the ash discharging pipeline 24 by the residual material pneumatic conveyor 17 of the material clearing mechanism, and a fixed amount of samples in the lower glass tube 7 fall into the material cup 14 after the lower telescopic flashboard 10 is opened;
the X fluorescence measuring mechanism 23 is used for measuring the element components of the cement raw materials entering the material cup 14, and after the measurement is completed, raw material samples in the material cup 14 are discharged back into the air conveying chute 25 along the ash discharge pipeline 24 by the sample cleaning pneumatic conveyor 21 of the material cleaning mechanism;
the material cleaning mechanism comprises a material remaining electric ball valve 16, a material remaining pneumatic conveyer 17, a pneumatic electromagnetic valve group 18, a compressed air source 19, a sample cleaning electric ball valve 20, a sample cleaning pneumatic conveyer 21 and an ash discharge pipeline 24; the ash discharge pipeline 24 is connected to the top of the air conveying chute 25 and is positioned at a downstream position far away from the sampling mechanism or connected to a nearby raw material zipper machine; the surplus material pneumatic conveyor 17, the sample cleaning electric ball valve 20 and the sample cleaning pneumatic conveyor 21 of the surplus material electric ball valve 16 are arranged on an ash discharge pipeline 24 in series, the ash discharge pipeline 24 is a PVC steel wire hose with the pipe diameter of 60mm, the PVC steel wire hose is connected to the top of an air conveying chute 25 and is arranged at the downstream of a sampling mechanism, and a compressed air source 19 is led out from a compressed air tank of a cement production site and is provided with a water filtering and pressure reducing device.
The waste electric ball valve 16 and the waste pneumatic conveyor 17 in the waste cleaning mechanism are used for executing waste discharging action in the upper glass tube 5, the waste cleaning electric ball valve 20 and the waste cleaning pneumatic conveyor 21 are used for sample cleaning action in the material cup 14, and the waste discharging action and the sample cleaning action in the waste cleaning mechanism are interlocked and cannot be operated simultaneously, wherein the sample cleaning action is the priority.
According to the embodiment of the invention, the residual material pneumatic conveyor 17 and the sample cleaning pneumatic conveyor 21 are XFXFJ-100V type pneumatic conveyors, 0.4Mpa compressed air is used, the residual material electric ball valve 16 and the sample cleaning electric ball valve 20 are electric ball valves of KLD200-DN25 sanitary stainless steel and are in a normally closed state, and the two electric ball valves are interlocked and can not be opened simultaneously, and because a certain time is required from closing to full opening of the electric ball valves, taking a residual material cleaning process as an example, when a program executes residual material cleaning, the residual material electric ball valve 16 is firstly opened, after 5 seconds, the residual material pneumatic conveyor is opened, and after the residual material cleaning time is executed, the residual material electric ball valve 16 is firstly closed, and after 3 seconds, the residual material pneumatic conveyor 17 is closed.
The distance between the X-fluorescence measuring mechanism 23 and the measuring window 15 in the embodiment of the present invention is 5mm, and since the time from the start of sampling to the full of material taking of the sampling mechanism is about 80s under the normal production condition in the embodiment of the present invention, the measurement period of the X-fluorescence measuring mechanism 23 is set to 120s, the measured objects are Al, si, S, K, ca and Fe elements, and the X-fluorescence measurement energy spectrum of the raw material is shown in fig. 7.
According to the embodiment of the invention, the blanking pipeline 4, the upper glass tube 5, the upper telescopic flashboard 8, the lower glass tube 7, the lower telescopic flashboard 10, the material cup 14 and the measuring window 15 are sequentially and hermetically connected from top to bottom, wherein the pipe diameters of the upper glass tube 5 and the lower glass tube 7 are the same, and both ends of the upper glass tube 5 and the lower glass tube 7 are respectively connected with a transition pipe seat with a rubber ring inside and an O-shaped ring sinking groove outside.
The upper telescopic flashboard 8 and the lower telescopic flashboard 10 in the embodiment of the invention have the same structure and both comprise a stainless steel sheet with a round hole and a sealing shell driven by a telescopic cylinder, wherein the upper telescopic flashboard (8) is in a normally open state, and the lower telescopic flashboard (10) is in a normally closed state.
As shown in fig. 3 and 4, in order to provide a front view and a side view of the structure of the lower retractable shutter 10 in a normally closed state in the embodiment of the present invention, the lower retractable shutter 10 includes an upper sealing cover plate 26, a lower sealing cover plate 27, an O-ring 28, a stainless steel sheet 29, a connection structure 30, a retractable cylinder 31, and a retractable shutter bracket 32; wherein the upper sealing cover plate 26 and the lower sealing cover plate 27 are provided with mounting grooves of O-shaped rings, the centers of the upper sealing cover plate and the lower sealing cover plate are provided with phi 12mm through holes, and the peripheries of the through holes are reserved with phi 30mm deep 3mm sinking grooves for connecting with a transition tube seat at the bottom end of the lower glass tube 7; the stainless steel sheet 29 is a 304 stainless steel sheet with mirror surface polished surface, the thickness is 1.5mm, a blanking hole 33 with the aperture of 12mm is formed, the stainless steel sheet 29 is fixed with a telescopic air cylinder 31 through a connecting structure 30, the forward and backward movement of the stainless steel sheet 29 with the blanking hole is driven by the movement in the stroke of the telescopic air cylinder 31 so as to control a blanking switch in the material receiving process, and the telescopic air cylinder 31 is a mini stainless steel telescopic air cylinder, is connected with 0.4Mpa compressed air and is fixed on a telescopic flashboard bracket 32; the O-ring 28 is a 4mm wear-resistant fluororubber ring and is mounted in both the upper and lower sealing cover plates, so that the stainless steel sheet 29 is sealed between the upper and lower cover plates, so that the upper and lower retractable shutters perform opening and closing actions and no raw material sample runs out of the retractable shutters during the air tap purging process of the upper glass tube 5.
The upper glass tube (5) and the lower glass tube (7) are transparent glass tubes with the inner diameter not smaller than 10 mm; as shown in FIG. 5, the structure of the upper glass tube 5 according to the embodiment of the invention is a quartz glass tube, the inner diameter is 12mm, the outer diameter is 18mm, the length is 60mm, 1 air tap with the inner diameter of 3mm, the outer diameter of 6mm and the length of 25mm is arranged at the position 20mm away from the bottom of the upper glass tube 5, the included angle between the air tap and the main tube is 45 degrees, the air tap is connected with an upper vent valve 6, the normally open state is communicated with the atmosphere, when the residual material cleaning is executed, the upper vent valve 6 is switched to be communicated with 0.2Mpa of compressed air from a compressed air source 19, the bottom of the upper glass tube 5 is blown, the materials are blown away, and the residual material above the upper telescopic flashboard 8 is carried out by the high-speed air flow generated by the residual material pneumatic conveyor 17 and discharged into the air conveying chute 25 along the blanking pipeline 4 and the ash discharging pipeline 24.
In the embodiment of the invention, the upper material level sensor 9 and the lower material level sensor 11 are correlation type photoelectric switches with the same structure, and the upper material level sensor 9 comprises 2 correlation type photoelectric switches, 1 transmitting end and 1 receiving end, which are arranged at two sides of the bottom of the upper glass tube 5, and when the material level in the upper glass tube 5 reaches the position of the upper material level sensor 9, the upper material level sensor 9 and the lower material level sensor 11 are arranged at two sides of the bottom of the lower glass tube 7, and when the lower telescopic flashboard 10 is opened, the lower glass tube is detected to be free of materials, a material empty signal is triggered.
As shown in fig. 6, a schematic structural diagram of a material cup 14 in the embodiment of the present invention is shown, the material cup 14 is an annular quartz glass tubular structure, the material cup 14 is a tubular structure with hydrophobic inner wall, the inner diameter is 2 to 4 times of that of the lower glass tube 7, the height is 40mm, the inner diameter is 30mm, the top is connected with a material cup fixing structure 34 through an O-ring 28, the material cup fixing structure 34 is fixed with a lower telescopic flashboard 10, the upper part of the material cup 14 is provided with 1 material cup upper air tap 35, the material cup upper air tap 35 is connected with a lower air vent valve 13, and is in a normally open state and is communicated with the atmosphere, and the lower air vent valve 13 is closed when sample cleaning is performed; the middle part of the material cup 14 is provided with a sample cleaning opening 36, the caliber is 15mm, the sample cleaning opening is communicated with a material cleaning mechanism, and an electric vibrator 12 is tightly fixed on the opposite side surface of the middle part; the lower part of the material cup 14 is provided with 4 material cup blowing air nozzles 37 which are uniformly distributed, and are respectively connected with 4 pneumatic one-inlet-outlet electromagnetic valves in the pneumatic electromagnetic valve group 18, and are in a normally closed state, when sample cleaning action is executed, the 4 electromagnetic valves are simultaneously opened to blow compressed air with the air pressure of 0.1Mpa to the bottom of the material cup 14, blow and scatter samples in the material cup and blow the inner wall of the material cup 14; the bottom of the cup 14 is connected with a measuring window 15, and the measuring window 15 is composed of a window film fixing ring 38 with the surface of polypropylene material coated with silicone grease and a window film 39 made of high polymer material.
The device in the embodiment of the invention is controlled by the PLC system 22, and the logic diagram is shown in fig. 2, and the specific steps are as follows:
1) Starting;
2) The material receiving electric ball valve 3 is opened, then the sampling mechanism enters a sampling period, the gear motor 1 positively rotates for sampling, the single positive rotation time is 30s, the upper limit of the positive rotation is 5 times, the interval (delay) is 2s, raw materials are extracted from the chute and fall into the material receiving mechanism along the material falling pipeline 4, the raw materials are continuously piled up in the lower glass tube 7, if the material level is piled up to the position of the material loading level sensor 9 and is triggered, the gear motor 1 stops the positive rotation sampling, otherwise, the sampling is continued, if the number of times of the positive rotation of the gear motor 1 exceeds the upper limit and still does not reach the full material, the system feeds back that the material is not fully taken, and the device ends the operation;
3) When the feeding level sensor 9 triggers a full signal, the material receiving electric ball valve 3 is closed, the upper ventilation valve (6) is closed, the upper telescopic flashboard 8 is closed at the same time, and the speed reducing motor 1 of the sampling mechanism is stopped for 2 seconds, and then reverse sampling is performed, so that the material in the reamer thread gap is discharged back into the air conveying chute 25 through the feed inlet at the front end of the outer sleeve;
4) And executing the residual material discharging action: the electric ball valve 16 of the surplus material is opened, a solenoid valve connected with the surplus material pneumatic conveyor 17 in the pneumatic solenoid valve group 18 opens a compressed air source 19 from a compressed air tank to enter the surplus material pneumatic conveyor 17 to generate high-speed air flow, the pneumatic solenoid valve communicated with an air tap at the bottom of the upper glass tube 5 in the pneumatic solenoid valve group 18 is opened, so that compressed air from the compressed air source 19 blows air to the bottom of the upper glass tube 5 to blow off materials, the above actions are kept in a recovery state after 20s are executed, and the surplus materials above the upper telescopic flashboard 8 are brought out by the high-speed air flow generated by the surplus material pneumatic conveyor 17 and are discharged into the air conveying chute 25 along the blanking pipeline 4 and the ash discharging pipeline 24;
5) The upper vent valve (6) is opened, and the upper telescopic flashboard (8) is opened;
6) The lower telescopic flashboard 10 is opened, so that a fixed amount of raw material samples in the lower glass tube 7 fall into a material cup 14 below, the lower glass tube is closed after being kept for 5 seconds, the lower glass tube is recorded to be opened for 1 time, and the vibrator 12 and the lower telescopic flashboard 10 are synchronously opened and closed;
7) If the blanking level sensor 11 triggers a blanking empty signal, the lower telescopic flashboard 10 is closed, the next step (8) is carried out, otherwise, the lower telescopic flashboard 10 repeats the action of the step (6), if the number of times of opening the lower telescopic flashboard 10 exceeds the preset number of times of 3, the blanking level sensor 11 still does not trigger the blanking empty signal, a blanking abnormality prompt is fed back, and the device ends running;
8) The lower vent valve 13 is closed;
9) The X fluorescence measuring mechanism performs element component measurement on the sample in the material cup 14, and the program performs the steps (2), (3) and (4);
10 Performing a sample cleaning action: after the measurement is completed, the sample removing electric ball valve 20 is opened, an electromagnetic valve connected with the sample removing pneumatic conveyor 21 in the pneumatic electromagnetic valve group 18 is opened, a compressed air source 19 from a compressed air tank enters the sample removing pneumatic conveyor 21 to generate high-speed air flow, an electromagnetic valve communicated with a material cup sweeping air nozzle 37 at the bottom of the material cup 14 in the pneumatic electromagnetic valve group 18 is simultaneously opened, so that compressed air from the compressed air source 19 blows air to the bottom of the material cup 14 to blow off sample materials, the above actions are kept to be carried out for 20 seconds, and then the initial state is restored, so that raw material samples in the material cup 14 are carried out by the high-speed air flow generated by the sample removing pneumatic conveyor 21 and are discharged into the air conveying chute 25 along the ash discharging pipeline 24;
11 A) the lower vent valve 13 is opened; the jump goes to step (5) and is circularly executed.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (8)
1. An automatic sampling type online X fluorescence analysis device for cement raw materials is characterized by comprising a sampling mechanism, a receiving mechanism, an X fluorescence measurement mechanism and a material cleaning mechanism; the sampling mechanism is used for uniformly and slightly collecting raw material samples from an air conveying chute at the upstream of the rear end of the cement raw material mill; the sampling mechanism comprises a speed reducing motor (1) and a spiral reamer sampler (2) driven by the speed reducing motor, and is used for continuously sampling in a small number of repeated circulation modes; the receiving mechanism is used for judging the sample amount, quantitatively sampling and feeding the sample to the X fluorescence measuring mechanism; the X fluorescence measurement mechanism is used for analyzing the elemental composition of the cement raw material; the material cleaning mechanism is used for discharging the residual materials in the material receiving mechanism and the measured samples in the material cup back to the air conveying chute; the sampling mechanism intermittently and continuously samples and synchronously operates with the X fluorescence measuring mechanism, the material receiving mechanism is used for quantitatively sampling and feeding samples to the X fluorescence measuring mechanism, the sample amount of the X fluorescence measuring mechanism is ensured to be stable all the time, and the material clearing mechanism is used for re-discharging redundant materials in the material receiving mechanism and measured samples in the material cup into the air conveying chute, so that the clean and no-residual materials in the device are ensured, and the online analysis of cement raw materials is realized; the receiving mechanism comprises a receiving electric ball valve (3), a blanking pipeline (4), an upper glass tube (5), an upper ventilation valve (6), a lower glass tube (7), an upper telescopic flashboard (8), an upper material level sensor (9), a lower telescopic flashboard (10), a lower material level sensor (11), a lower ventilation valve (13), a material cup (14) and a measuring window (15); the material receiving electric ball valve (3) is in a normally closed state, is arranged between the spiral reamer sampler (2) and the blanking pipeline (4), and is opened when the sampling mechanism executes sampling action; the middle part of the blanking pipeline (4) is connected with the material cleaning mechanism in a sealing way, and the bottom of the blanking pipeline (4) is connected with the upper glass tube (5) in a sealing way; the upper telescopic flashboard (8) and the lower telescopic flashboard (10) comprise stainless steel sheets with round holes and sealed shells driven by telescopic cylinders, wherein the upper telescopic flashboard (8) is in a normally open state, the lower telescopic flashboard (10) is in a normally closed state, the upper telescopic flashboard (8) is closed when receiving materials fully, and the lower telescopic flashboard (10) is opened when feeding samples for the X fluorescence measuring mechanism (23); the material cleaning mechanism comprises a material remaining electric ball valve (16), a material remaining pneumatic conveyor (17), a pneumatic electromagnetic valve group (18), a compressed air source (19), a sample cleaning electric ball valve (20), a sample cleaning pneumatic conveyor (21) and an ash discharge pipeline (24); the ash discharge pipeline (24) is connected into the air conveying chute (25), and the waste electric ball valve (16), the waste pneumatic conveyor (17), the sample cleaning electric ball valve (20) and the sample cleaning pneumatic conveyor (21) are arranged on the ash discharge pipeline (24) in series, and the waste electric ball valve (16) and the sample cleaning electric ball valve (20) are in a normally closed state and are used for isolating the influence of air flow in the air conveying chute (25).
2. The automatic style taking type cement raw material online X fluorescence analysis device according to claim 1, wherein the upper telescopic flashboard (8) and the lower telescopic flashboard (10) have the same structure, and comprise stainless steel sheets with round holes and sealed shells driven by air cylinders, the upper telescopic flashboard (8) is in a normally open state, the lower telescopic flashboard (10) is in a normally closed state, when receiving materials, the upper telescopic flashboard (8) is closed, and the lower telescopic flashboard (10) is opened when feeding samples to an X fluorescence measurement mechanism (23); the lower telescopic flashboard (10) comprises an upper sealing cover plate (26), a lower sealing cover plate (27), an O-shaped ring (28), a stainless steel sheet (29), a connecting structure (30), a telescopic cylinder (31) and a telescopic flashboard bracket (32); wherein the upper sealing cover plate (26) and the lower sealing cover plate (27) are provided with mounting grooves of O-shaped rings, the centers of the upper sealing cover plate and the lower sealing cover plate are provided with through holes, and sinking grooves are reserved at the peripheries of the through holes and are used for being connected with a transition tube seat at the bottom end of the lower glass tube (7); the stainless steel sheet (29) is a 304 stainless steel sheet with mirror surface polished surface and is provided with a blanking hole (33), the stainless steel sheet (29) is fixed with a telescopic air cylinder (31) through a connecting structure (30), the stainless steel sheet (29) with the blanking hole is driven to move back and forth by the movement in the stroke of the telescopic air cylinder (31) so as to control a blanking switch, and the telescopic air cylinder (31) is a mini stainless steel telescopic air cylinder and is connected with compressed air and fixed on a telescopic flashboard bracket (32).
3. The automatic sampling type cement raw meal online X-ray fluorescence analysis device according to claim 1, wherein the loading level sensor (9) and the unloading level sensor (11) are diffuse reflection type or correlation type photoelectric sensor switches; the feeding level sensor (9) is arranged at the bottom of the upper glass tube (5), and triggers a full signal when the stacking height of the material level reaches the position of the feeding level sensor (9); the blanking level sensor (11) is arranged at the bottom of the lower glass tube (7), and after the lower telescopic flashboard (10) is opened to enable a sample in the lower glass tube (7) to fall into the lower material cup (14), a material empty signal is triggered if the blanking level sensor (11) detects that no material exists in the lower glass tube (7).
4. The automatic sampling type cement raw meal online X-ray fluorescence analysis device according to claim 1, wherein the upper glass tube (5) and the lower glass tube (7) are transparent glass tubes, wherein the upper glass tube (5) is used for being matched with an upper material level sensor (9) and an upper telescopic flashboard (8) to monitor the material level, and the pipe diameter and the height of the lower glass tube (7) are fixed for containing a fixed amount of samples.
5. The automatic sampling type cement raw material online X-ray fluorescence analysis device according to claim 1, wherein the bottom of the upper glass tube (5) is provided with an air tap, the air tap is of an upward inclined thin tube structure and is respectively communicated with the upper vent valve (6) and the pneumatic electromagnetic valve group (18) through a three-way structure, and the upper vent valve (6) is in a normally open state, so that the inside of the receiving mechanism is communicated with the outside atmosphere in the sampling process.
6. The automatic sampling type cement raw meal online X fluorescence analysis device according to claim 1, wherein the material cup (14) is of a tubular structure with hydrophobic inner wall, the inner diameter is 2 to 4 times of that of the lower glass tube (7), the height is not less than 25mm, the upper part is provided with 1 material cup upper air tap (35), the upper part is connected with the lower air tap (13) and is communicated with the atmosphere in a normally open state, the middle part is provided with a sample cleaning port which is communicated with the material cleaning mechanism pipeline, the opposite side of the sample cleaning port is provided with a vibrator (12) for tightly enabling materials in the cup, the lower part of the material cup (14) is provided with a plurality of material cup purging air taps (37) which are uniformly distributed and are connected with a plurality of electromagnetic valves in the pneumatic electromagnetic valve group (18), the electromagnetic valves are all in a normally closed state, when a sample cleaning action is executed, the electromagnetic valves are simultaneously opened and compressed air is communicated, and the piled sample is blown to the bottom of the material cup (14) through the air taps in a plurality of directions.
7. The automatic style taking type cement raw material online X fluorescence analysis device according to claim 1, wherein the upper glass tube (5) is a quartz glass tube, the upper glass tube (5) is provided with 1 air tap, an included angle of the air tap and a main tube is 45 degrees, the air tap is connected with an upper ventilation valve (6), a normally open state is communicated with the atmosphere, when the residual material cleaning action is executed, the upper ventilation valve (6) is switched on with compressed air from a compressed air source (19), air is blown to the bottom of the upper glass tube (5), materials are blown off, and residual materials above an upper telescopic flashboard (8) are carried out by matching with high-speed air flow generated by a residual material pneumatic conveyor (17) and discharged into an air conveying chute (25) along a blanking pipeline (4) and an ash discharging pipeline (24).
8. The automatic sampling type online X fluorescence analysis device for cement raw materials according to claim 7, wherein a residual material electric ball valve (16) and a residual material pneumatic conveyor (17) in the material cleaning mechanism are used for executing residual material discharging actions in an upper glass tube (5), the sample cleaning electric ball valve (20) and the sample cleaning pneumatic conveyor (21) are used for sample cleaning actions in a material cup (14), and the interlocking of the residual material discharging actions and the sample cleaning actions in the material cleaning mechanism cannot be operated simultaneously, wherein the sample cleaning actions are priority.
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| CN111175332B (en) * | 2020-01-09 | 2021-11-02 | 中国原子能科学研究院 | Automatic mixed K boundary densimeter system |
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