CN111912750A - Method and device for detecting granularity composition of sintering mixture - Google Patents
Method and device for detecting granularity composition of sintering mixture Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims abstract description 301
- 238000005245 sintering Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 141
- 239000002245 particle Substances 0.000 claims abstract description 82
- 238000005303 weighing Methods 0.000 claims abstract description 71
- 238000007599 discharging Methods 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 230000009471 action Effects 0.000 claims abstract description 14
- 235000019580 granularity Nutrition 0.000 claims description 62
- 238000007789 sealing Methods 0.000 claims description 29
- 238000007664 blowing Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
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- 238000005070 sampling Methods 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
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- 239000000428 dust Substances 0.000 description 2
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- 239000008187 granular material Substances 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- 239000011163 secondary particle Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The application discloses a detection method and a detection device for particle size composition of a sintering mixture. During detection, weighing empty material cups by using the weighing sensors, discharging mixture samples in the feeding funnel into the cavity by using the discharging round roller, controlling the air blower to blow air into the cavity, enabling the mixture samples to fall into the corresponding collecting hoppers in a grading manner under the action of wind power, weighing the mixture weights falling into the material cups by the collecting hoppers by using the weighing sensors, and finally determining the particle size composition of the mixture samples according to the weight of each material cup containing the mixture and the weight of the corresponding empty cup. The method and the device classify the sintering mixture by utilizing the principle of wind classification, and then weigh the classified materials, thereby calculating the granularity composition of the mixture.
Description
Technical Field
The application relates to the technical field of material detection, in particular to a method and a device for detecting granularity composition of a sintering mixture.
Background
In the field of metallurgical sintering, the air permeability of a sintering machine material layer is improved, mineral aggregates can be heated more uniformly, the quality and the yield of the sintered ores are improved, and the granularity of a sintered mixed material is one of key factors influencing the original air permeability of the sintering material layer. When the granularity of the mixed material is too small, the clearance between the materials is too small, so that the air permeability of a sinter bed is poor, the air distribution and the heat transfer are uneven, the stability and the improvement of the physical indexes of the sinter are not facilitated, the sinter powder rate is increased, the strength is reduced, and the sintering power consumption is increased. When the granularity of the mixed material is too large, the clearance of the material is increased, the temperature difference between the inside and the outside of the material is possibly too large, and the material quantity on the trolley with the same volume is reduced, so that the capacity of sinter is reduced, and the energy consumption of a main exhaust fan of a sintering machine is also increased. Therefore, in order to heat the materials more uniformly, increase the air permeability and reduce the energy consumption, the control of the granularity of the mixture is a key factor.
At present, a screening method is generally adopted for detecting the grain size composition of the sintering mixture, the sintering mixture is randomly sampled at a belt near a discharge port of a secondary circular mixing drum manually, a plurality of standard sieves are adopted for screening and grading the sintering mixture, the sintering mixture of each grain size is weighed after screening is finished, and finally the grain size composition of the sintering mixture is calculated.
However, when the screening method is adopted, the problems that the labor intensity of manual sampling is high, the detection frequency is low, the stability and the representativeness of sampling are poor, the detection result is not timely, the lag time for guiding the particle size adjustment is long, the process parameter adjustment is not facilitated, and the like exist, and the particle size composition is artificially measured after classification, so that the automation degree is low, the efficiency is low, and the method is not suitable for the particle size detection of the mixture on the site of a sintering plant. Therefore, how to accurately measure the particle size composition of the mixture in real time becomes one of the technical difficulties which need to be solved urgently for improving the quality of the sintered mineral products.
Disclosure of Invention
The application provides a method and a device for detecting the granularity composition of a sintering mixture, which aim to solve the problem that the existing detection method cannot accurately detect the granularity composition of the sintering mixture on line in real time.
In a first aspect, a device for detecting particle size composition of a sinter mixture is characterized by comprising: the top of one end of the cavity is provided with a feeding funnel which is communicated with the cavity; one side of the cavity is provided with a discharging round roller, the discharging round roller is positioned below the feeding hopper, and the discharging round roller is used for enabling the mixture in the feeding hopper to fall into the cavity;
an air inlet is formed in one side of the cavity and is positioned below the discharging round roller; the air inlet is provided with an air blower which is used for blowing air into the cavity, and the direction of the air is vertical to the moving direction of the mixture in the cavity; a gas discharge pipe is arranged on the other side of the cavity, and the air outlet direction of the gas discharge pipe is the same as the air inlet direction of the air blower;
the bottom of the cavity is provided with a plurality of collecting hoppers for collecting the mixture with different particle sizes, the collecting hopper for collecting the mixture with small particle size is close to the gas discharge pipe, and the collecting hopper for collecting the mixture with large particle size is close to the air inlet; the bottom of every collection fill is equipped with corresponding weighing component, every weighing component's bottom is equipped with corresponding weighing sensor, weighing sensor is used for weighing the mixture that falls into weighing component through collecting the fill.
Optionally, the device further comprises a plurality of sealing valves, two sealing valves are arranged between the feeding hopper and the cavity, and two sealing valves are arranged at the bottom of each collecting hopper.
Optionally, the gas exhaust pipe further comprises a filter screen, and the filter screen is arranged at the connecting position of the gas exhaust pipe and the cavity.
Optionally, the weighing assembly comprises a material cup and a weighing platform, the weighing platform is located below the collecting hopper, the material cup is placed on the weighing platform, and the material cup is used for containing the mixture collected by the corresponding collecting hopper; the weighing sensor is arranged at the bottom of the weighing platform.
Optionally, a discharge port is arranged between the cavity and the discharging round roller, and the feeding hopper is communicated with the cavity through the discharge port.
In a second aspect, the present invention provides a method for detecting a particle size composition of a sintering mixture, which is applied to the apparatus for detecting a particle size composition of a sintering mixture according to the first aspect, and the method includes:
weighing the material cups below the corresponding collecting hoppers by using each weighing sensor to obtain the weight of a plurality of empty cups;
controlling the discharging round roller to rotate, so that the mixture sample in the feeding hopper falls into the cavity;
controlling an air blower to blow air into the cavity, so that the falling mixture samples fall into corresponding collecting hoppers according to different particle sizes under the action of the air force;
controlling the opening of a sealing valve at the bottom of each collecting hopper to enable the mixture sample collected in each collecting hopper to fall into the corresponding cup;
weighing the material cups containing the mixture samples by using each weighing sensor to obtain the weight of each material cup containing the mixture;
and determining the grain size composition of the mixture sample according to the weight of each material cup for containing the mixture and the corresponding weight of the empty cup.
Optionally, the control air-blower is to the interior blast air of cavity, makes the mixture sample of whereabouts fall into corresponding collection fill under the effect of wind power according to different granularities, includes:
controlling the air blower to blow air into the cavity, wherein the direction of the air is vertical to the falling direction of the mixture sample, and the air speed and the air pressure are constant; the method comprises the following steps that under the action of wind power, mixture samples with different particle sizes fall into a collecting hopper close to a gas discharge pipe, and mixture samples with large particle sizes fall into a collecting hopper close to an air inlet.
Optionally, determining a particle size composition of the mixture sample according to the weight of each material cup containing the mixture and the corresponding weight of the empty cup, includes:
determining the weight of the mixture sample corresponding to different granularities according to the weight of each material cup for containing the mixture and the corresponding weight of the empty cup;
determining the total weight of the mixture sample according to the weights of the mixture samples corresponding to different granularities;
and determining the grain size composition percentage of the mixture samples with different grain sizes according to the weight of the mixture samples corresponding to the different grain sizes and the total weight of the mixture samples so as to determine the grain size composition of the mixture samples.
Optionally, the weight of the mixture sample corresponding to different particle sizes is determined according to the weight of each cup containing the mixture and the corresponding weights of the plurality of empty cups according to the following formula:
Wn＝Wtn-Wkn；
in the formula, WnWeight of the blend sample corresponding to different particle sizes, Wtn is the weight of each cup containing the mixture, Wkn is the empty cup weight of each material cup.
Optionally, according to the following formula, determining the grain size composition percentage of the mixture sample with different grain sizes according to the weight of the mixture sample corresponding to different grain sizes and the total weight of the mixture sample:
in the formula, ωnIs the percentage of the grain size composition of the mixed material samples with different grain sizes, WGeneral assemblyIs the total weight of the mixture sample, WnThe weight of the mixture samples corresponding to different granularities, and N is the number of the collection hoppers arranged in the detection device.
According to the technical scheme, the detection method and the detection device for the particle size composition of the sintering mixture provided by the embodiment of the invention comprise a cavity, a feeding hopper, a discharging round roller, a blower, a collecting hopper, a material cup and a weighing sensor. During detection, the weight of the empty material cup is weighed by the weighing sensor, the mixture sample in the feeding funnel is discharged into the cavity by the discharging round roller, air blast is controlled by the air blower to the cavity, the mixture sample falls into the corresponding collecting hopper in a grading manner under the action of wind power, the weight of the mixture falling into the material cup by the collecting hopper is weighed by the weighing sensor, and finally, the particle size composition of the mixture sample is determined according to the weight of each material cup containing the mixture and the weight of the corresponding empty cup. The method and the device utilize the principle of wind classification to carry out wind classification on the sintering mixture, and then weigh the classified materials, thereby calculating the granularity composition of the mixture.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic structural diagram of a detection apparatus for detecting particle size composition of a sintered mixture according to an embodiment of the present invention;
FIG. 2 is a partially enlarged view of a device for detecting the grain size composition of the sintered mixture according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a weighing assembly according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for detecting a particle size composition of a sintering mixture according to an embodiment of the present invention.
Detailed Description
FIG. 1 is a schematic structural diagram of a detection apparatus for detecting particle size composition of a sintered mixture according to an embodiment of the present invention; fig. 2 is a partially enlarged view of a detection device for detecting the grain size composition of the sintered mixture according to an embodiment of the present invention.
According to the detection device for the grain size composition of the sintering mixture, provided by the embodiment of the invention, the wind classification is carried out on the sintering mixture by utilizing the principle of wind classification, and then the classified material is weighed, so that the grain size composition of the mixture is calculated.
The detection device provided by the embodiment has the following basic principles for detecting the granularity composition of the mixture: the method of utilizing wind-force to grade carries out the granularity to the mixture of unloading round roller 3 exhaust, because the granularity is different, its quality that corresponds is different, consequently for the material is at the whereabouts in-process, under the condition that receives equal wind pressure, and the material that the granularity is big falls into the preceding material collection fill of cavity 2, is close to the collection fill of air intake promptly, and the material that the granularity is little falls into the material collection fill at cavity rear portion, keeps away from the collection fill of air intake promptly.
Then weighing the materials in each collecting hopper to obtain the weight of the corresponding materials, dividing the materials into 4 grades according to the granularity grade, setting 4 collecting hoppers as an example, adding the materials of the 4 collecting hoppers as the total weight, and recording the total weight as WGeneral assemblyThe calculation formula is as follows:
Wgeneral assembly＝W1+W2+W3+W4；
In the formula: wGeneral assemblyThe weight of the mixed materials is as follows: g; w1Weight in first order particle size scale, unit: g; w2Weight in second order particle size scale unit: g; w3Weight for the third grade particle size grade, unit: g; w4Weight in fourth particle size scale unit: g.
using formulas
And calculating the weight ratio corresponding to the weight of each particle size grade to obtain the particle size composition value of the sintering mixture.
In order to realize the principle of air classification, referring to fig. 1, an embodiment of the present invention provides a device for detecting particle size composition of a sintering mixture, including: the cavity 2 is used for realizing the wind classification process. A feeding funnel 1 is arranged at the top of one end of the cavity 2, and the feeding funnel 1 is communicated with the cavity 2; the mixture to be subjected to the particle size composition detection is placed in the feeding funnel 1, and when the wind power classification is carried out, the mixture enters the cavity 2 from the feeding funnel 1.
Taking the state shown in fig. 1 as an example, the feeding funnel 1 is disposed at the upper left portion of the cavity 2, the feeding funnel 1 is communicated with the cavity 2, and in order to prevent the mixture from continuously entering the cavity 2 when the particle size composition detection is not performed, in this embodiment, two sealing valves 10 are disposed between the feeding funnel 1 and the cavity 2, which are respectively a first sealing valve and a second sealing valve, and at the same time, the first sealing valve and the second sealing valve seal the feeding funnel 1 from the cavity 2, so as to prevent that, when wind power is classified, wind enters the feeding port of the feeding funnel 1, which may cause the feeding port of the feeding funnel 1 to raise dust greatly, and affect the effect of wind power classification. When the granularity composition detection is needed, the first sealing valve and the second sealing valve are opened, so that the mixture in the feeding hopper 1 falls into the lower part of the feeding hopper 1 at the upper part of the discharging round roller 3, then the first sealing valve and the second sealing valve are closed, the discharging round roller 3 rotates, and the mixture is brought into the cavity 2.
When the classification is performed by using wind power, the speed of the intake air and the speed of the mixture falling are matched to make the particle size classification more accurate, and therefore, the speed of the mixture falling needs to be controlled by using the discharging round roller 3. In this embodiment, be equipped with the round roller 3 of unloading in one side of cavity 2, the round roller 3 of unloading is located the below of feed hopper 1, and the round roller 3 of unloading is arranged in realizing that the mixture among feed hopper 1 falls into cavity 2.
The round roller 3 of unloading sets up between feed hopper 1 and the upper left portion of cavity 2, and round roller 3 of unloading is used for arranging of mixture, and its round roller slew velocity is adjustable, drives the round roller through inverter motor and rotates, and different rotational speeds can produce different row's material volume for the falling speed of mixture is different.
In order to further control the blanking amount and the material layer thickness of the mixed material, a certain gap needs to be arranged between the discharging round roller 3 and the cavity 2. As shown in fig. 2, a discharge port 22 is arranged between the cavity 2 and the round discharging roller 3, the feeding funnel 1 is communicated with the cavity 2 through the discharge port 22, and when the round discharging roller 3 rotates, the mixture in the feeding funnel 1 enters the cavity 2 through the discharge port 22. In order to carry out efficient particle size classification, a gap between the discharging round roller 3 and the top of the cavity 2 needs to keep a certain width, and if the gap is too large, the mixture falls into the cavity, so that the thickness of the mixture is too thick, and the wind classification is not facilitated; if the gap is too few, be unfavorable for the material to fall into the cavity, lead to the material to block up in gap department easily, especially large granule material is difficult for discharging, influences the hierarchical effect of wind-force.
When utilizing the wind-force classification principle, the mixture need blast air in advance when discharging into cavity 2 by the round roller 3 of unloading, and for making the material that the granularity is big fall into the material collection fill in front of cavity 2, the material that the granularity is little falls into the material collection fill at cavity rear portion, the direction that needs the wind is transmitted by cavity 2 the place ahead to cavity 2 rear.
Therefore, an air inlet 21 is formed in one side of the cavity 2, and the air inlet 21 is positioned below the discharging round roller 3; the air inlet 21 is arranged in front of the cavity 2 to achieve the effect that the wind blows backwards from the front. In fig. 1, the left side of the mixture chamber 2 is an air inlet 21, and the structure of the air inlet 21 is a grid structure, preferably one of a grid structure, a louver structure or a perforated plate structure.
The air is blown to the rear from the front of the cavity 2, an air blower 4 is required to be arranged at the air inlet 21, the air blower 4 is used for blowing air into the cavity 2, and the direction of the air is vertical to the moving direction of the mixture in the cavity 2. The air inlet 21 is directly connected with an air blower 4 with controllable air quantity and stable air pressure, and the air blower 4 is used for conveying airflow with constant pressure to the cavity. Taking the state shown in fig. 1 as an example, the movement direction of the mixture in the cavity 2 is from top to bottom, and the blowing direction of the air blower 4 is from left to right, so that the particle size classification can be realized, the material with large particle size falls into the material collecting hopper in front of the cavity 2, and the material with small particle size falls into the material collecting hopper at the rear of the cavity 2.
In order to better realize the particle size classification, a gas discharge pipe 8 is required to be arranged on the other side of the cavity 2, and the air outlet direction of the gas discharge pipe 8 is the same as the air inlet direction of the air blower 4. That is, the air blown into the cavity 2 by the blower 4 needs to be discharged from the gas discharge pipe 8 after the classification of the wind power, so as to prevent the air from whirling after being blown into the closed cavity 2 and resisting the newly entered air, thereby affecting the falling direction of the mixture. The condition that small-granularity materials fall into the collecting hopper in front of the cavity 2 and large-granularity materials fall into the collecting hopper behind the cavity 2 is easy to occur, the effect of wind power classification is influenced, and the detection of the granularity composition of the mixture is inaccurate.
And for preventing the mixture under the effect of wind force, small-size material is discharged by gas discharge pipe 8 with following wind, causes the wasting of resources to influence the weight of small-size material, the detection device that this embodiment provided still includes filter screen 9, and filter screen 9 sets up the junction at gas discharge pipe 8 and cavity 2. The gas discharge pipe 8 is arranged at the right side part of the cavity 2 and communicated with the inner space of the cavity 2, and a layer of filter screen 9 is added in the middle. The filter screen 9 is a metal mesh with a fine pore structure, and the pore diameter is preferably 200-400 meshes. If the aperture is too large, dust easily passes through the filter screen 9, and the particle size composition percentage of the mixture with the particle size less than 3mm is influenced; the mixture with small granularity can also pass through the filter screen 9 and be discharged from the gas discharge pipe 8, which causes resource waste.
When utilizing the air classification principle to carry out mixture granularity composition to examine, under the effect of wind-force, the mixture of different granularities falls into different material collection fill in, consequently, this embodiment is equipped with the collection fill 5 that the several is used for collecting different granularity mixtures in the bottom of cavity 2, and the setting quantity of collecting fill 5 is the same with the hierarchical grade quantity of granularity, if the granularity is the level four, then the setting quantity of collecting fill 5 also is four.
Collecting hopper 5 sets up in the lower part of cavity 2 to with cavity 2 direct intercommunication, the top edge of collecting hopper 5 is direct to be connected with cavity 2's bottom, does not have horizontal edge, and does not have horizontal edge between two adjacent collecting hoppers 5 yet, but the lug connection is in the same place, and two sides of collecting hopper 5 are even together promptly, in order to prevent that the material from piling up at horizontal edge. In order to make the mixture of whereabouts can get into the collection fill fast, avoid the mixture to pile up at the lateral wall of collecting and fighting 5, the angle value that needs the both sides limit of collecting and fighting 5 and cavity 2 bottom keeps more than 60, preferred 70 ~ 90 to the side material of collecting and fighting 5 adopts smooth, wear-resisting metal material, preferred stainless steel material.
Specifically, since the small-sized material is blown to a distant place and the large-sized material is not blown to a distant place, that is, to a position close to the discharge port 22, under the action of the wind, the collection hopper 5 for collecting the small-sized mixture is close to the gas discharge pipe 8 and the collection hopper 5 for collecting the large-sized mixture is close to the air inlet 21.
In order to prevent the material collected in the collecting hoppers 5 from leaking, in the present embodiment, two sealing valves 10 are provided at the bottom of each collecting hopper 5, i.e. each collecting hopper 5 is separated from the outside of the chamber 2 by a third sealing valve and a fourth sealing valve. The sealing valve in the device adopts an electric or pneumatic sealing valve, can be controlled to be opened or closed through a program, and has the function of preventing air in the cavity 2 from leaking to the feeding hopper 1 and the collecting hopper 5 during air blowing so as to influence the discharge of mixed materials and the collection of materials with corresponding particle sizes.
After each collecting hopper 5 collects the materials with the corresponding granularity, the materials in each collecting hopper 5 need to be weighed so as to calculate the granularity composition of the current detection mixture. Therefore, a corresponding weighing assembly 6 is arranged at the bottom of each collecting hopper 5, a corresponding weighing sensor 7 is arranged at the bottom of each weighing assembly 6, and the weighing sensor 7 is used for weighing the mixed materials falling into the weighing assembly 6 through the collecting hopper 5.
As shown in fig. 3, the weighing assembly 6 includes a material cup 61 and a weighing platform 62, the weighing platform 62 is located below the collecting hopper 5, the material cup 61 is placed on the weighing platform 62, and the material cup 61 is used for containing the mixture collected by the corresponding collecting hopper 5; the load cell 7 is disposed at the bottom of the weigh platform 62.
The material cup 61 is arranged at the lower part of the discharge channel of the collecting hopper 5 and is opposite to the discharge center position, so that the materials in the collecting hopper 5 can completely enter the material cup 61, and the accuracy of particle size composition calculation is further ensured. The weighing platform 62 is located at the bottom of the material cup 61 and is used for supporting the material cup 61, and the weighing sensor 7 is located at the bottom of the weighing platform 62 and is used for weighing the weight of the weighing platform 62, the material cup 61 and the corresponding material.
It can be seen that, according to the detection device for particle size composition of a sintered mixture provided by the embodiment of the present invention, by using the principle of wind classification, when the mixture is discharged from the feeding funnel 1 into the cavity 2 under the action of the discharging roller 3, the blower 4 blows air from the front of the cavity 2 to the rear, so that under the action of the wind, the mixture falls into the collecting hopper 5 located at the rear of the cavity 2, the material with small particle size falls into the collecting hopper 5 located at the front of the cavity 2, the material with large particle size falls into the collecting hopper 5 located at the front of the cavity 2, so as to divide the mixture into the materials with different particle size grades, and after the weight of the material in each collecting hopper 5 is weighed by using the weighing sensor 7, the composition percentage. Therefore, the detection device can detect the granularity composition of the sintering mixture on line in real time and accurately.
In order to fully explain the implementation process and the available beneficial effects of the detection device for the particle size composition of the sintering mixture provided by the embodiment of the invention, the embodiment of the invention further provides a detection method for the particle size composition of the sintering mixture, which is applied to the detection device for the particle size composition of the sintering mixture shown in fig. 1 and detects the particle size composition of the mixture by using the wind classification principle.
As shown in fig. 4, the detection method includes:
s1, weighing the material cups below the corresponding collecting hoppers by using each weighing sensor to obtain the weight of a plurality of empty cups;
taking four collecting hoppers arranged in the detection device as an example, the granularity of the mixed material is divided into 4 grades, preferably, the first-grade granularity is more than 8mm, the second-grade granularity is within the range of 5mm-8mm, the third-grade granularity is within the range of 3mm-5mm, and the fourth-grade granularity is less than 3mm according to the requirements of the sintering production process, wherein the No. 1 collecting hopper is used for collecting the material with the first-grade granularity in the figure 1, and the analogy is performed in sequence, and the No. 4 collecting hopper is used for collecting the material with the fourth-grade granularity.
To accurately determine the weight of the material with the corresponding granularity in each collecting hopper, the weight of the material cup when not containing the material needs to be determined. Weighing the weight W of each corresponding empty cup by using each weighing sensorkn, the weighing weights of the four weighing sensors are respectively W according to the sequence from the first granularity to the fourth granularity k1，W k2，W k3，Wk4。
S2, controlling the discharge round roller to rotate, and enabling the mixture sample in the feed hopper to fall into the cavity;
the mixture to be detected is grabbed from the belt through an intelligent sampling device to obtain a mixture sample, and then the mixture sample is poured into the feeding funnel 1, wherein the weight of the grabbed sample every time is 1000-2000 g. The intelligent sampling device is preferably a belt middle sampler or a robot.
And opening the first sealing valve and the second sealing valve to enable the mixture sample to fall to the top of the discharging round roller 3 through the first sealing valve and the second sealing valve, closing the first sealing valve and the second sealing valve after the mixture falls to the top of the discharging round roller 3, and controlling the discharging round roller 3 to rotate at a constant rotating speed to bring the mixture sample into the cavity 2.
The rotation speeds of the discharging round rollers 3 are different, so that the material quantity of the mixture sample entering the cavity 2 is different. Therefore, the discharge roller 3 is required to drop the mix sample into the cavity 2 at a constant rotational speed. So that the mixture sample falls down from the single-layer material surface in a waterfall shape, and the mixture is classified by wind power. The specific rotating speed of the discharging round roller 2 can be determined according to the actual mixture discharging requirement, and the embodiment is not particularly limited.
S3, controlling the air blower to blow air into the cavity, so that the falling mixture samples fall into corresponding collecting hoppers according to different particle sizes under the action of the air force;
the air blower 4 blows air into the cavity 2 through the air inlet 21, the air speed is constant, and the air direction is vertical to the blanking surface of the mixture sample. In the falling process, the mixture falls into each material collecting hopper in a grading manner under the blowing of wind power. When the working time T1 of the discharging round roller is longer than the threshold time, the threshold time can ensure that all the mixture samples fall into the cavity, the rotation of the discharging round roller 3 is stopped, the time T2 is delayed, the time T2 is generally set to be 5-10 s, the blower 4 is stopped blowing air, and the wind classification of the current mixture samples is completed.
The air speed of the air blower is set to be adjustable, and the air speed is determined according to the humidity of the mixture. Since the moisture content of the mixture is about 7%, the air speed of the blower 4 can be determined based on the mixture having a moisture content of 7%, and the air speed is constant during actual use.
When the wind classification principle is used, materials with different particle sizes fall into the corresponding collecting hoppers 5 according to the following method:
controlling an air blower to blow air into the cavity, wherein the direction of the air is vertical to the falling direction of the mixture sample; the method comprises the following steps that under the action of wind power, mixture samples with different particle sizes fall into a collecting hopper close to a gas discharge pipe, and mixture samples with large particle sizes fall into a collecting hopper close to an air inlet.
The small-granularity materials are blown to a position far away from the air inlet 21 under the action of wind power, and the large-granularity materials do not deviate from the original falling path too much due to the self weight, so that the large-granularity materials are closer to the position of the air inlet 21. And the collection of different grades is fought 5 and is set up according to the order of first order to fourth level, and then makes the material that first order granularity corresponds fall into a collection and fight in, analogizes in proper order, and the material that the fourth level granularity corresponds falls into No. four collection and fights.
S4, controlling the opening of a sealing valve at the bottom of each collecting hopper, and enabling the mixture samples collected in each collecting hopper to fall into the corresponding cup;
after the wind classification of the mixture samples is completed, materials with corresponding particle sizes need to be weighed, and therefore, two control valves at the bottom of each collecting hopper are controlled to be opened, so that the materials in the collecting hoppers fall into corresponding material cups. Because the top edge of collecting hopper 5 is direct to be connected with the bottom of cavity 2, the angle of the both sides limit of collecting hopper 5 and cavity 2 bottom is between 70 ~ 90, and the side adopts smooth material for the material in collecting hopper 5 can all fall into the material cup, the wall built-up phenomenon can not appear, consequently, can guarantee the accuracy of the material weight that every granularity corresponds. There are no lateral edges between the collecting hoppers to prevent material from accumulating at the lateral edges.
S5, weighing the material cups containing the mixture samples by using each weighing sensor to obtain the weight of each material cup containing the mixture;
after the material cup is filled with materials with corresponding granularity, the material cup filled with the materials is weighed by the corresponding weighing sensor 7, and the weight of the material cup filled with the mixed materials is determined. At this time, the weight of the cup containing the mixture includes the weight of the empty cup and the weight of the material corresponding to the corresponding granularity.
Acquiring the weight W of each material cup containing the mixture by using a weighing sensortn, the weight of the four material cups for containing the mixture is W t1，W t2，W t3，Wt4。
And S6, determining the grain size composition of the mixture sample according to the weight of each material cup for containing the mixture and the corresponding weight of the empty cup.
After the weight of each material cup containing the mixture and the weight of the empty cup are obtained, the weight of the material corresponding to each granularity needs to be calculated, and then the granularity composition of the mixture sample is determined.
Therefore, in this embodiment, determining the grain size composition of the mixture sample according to the weight of each cup containing the mixture and the corresponding weights of the plurality of empty cups includes:
s61, determining the weight of the mixture sample corresponding to different particle sizes according to the weight of each material cup containing the mixture and the corresponding weight of the empty cup;
the weight of the material corresponding to each particle size is equal to the difference between the weight of the material cup containing the corresponding mixture and the weight of the empty cup, namely, the weight of the mixture sample corresponding to different particle sizes is determined according to the following formula:
Wn＝Wtn-Wkn；
in the formula, WnWeight of the blend sample corresponding to different particle sizes, Wtn is the weight of each cup containing the mixture, Wkn is the empty cup weight of each cup.
The weight of the mixture sample with the first-grade granularity is as follows: w1＝Wt1-W k1; the weight of the mixture sample with the second-level granularity is as follows: w2＝Wt2-W k2; the weight of the mixture sample with the third grade granularity is as follows: w3＝Wt3-W k3; the weight of the mixture sample of the fourth grade granularity is as follows: w4＝Wt4-Wk4。
S62, determining the total weight of the mixture sample according to the weights of the mixture samples corresponding to different particle sizes;
after the weight of the material corresponding to each granularity is determined, the total weight of the mixture sample can be accurately determined so as to determine the proportion of the material corresponding to each granularity.
In this example, the total weight of the batch sample was determined according to the following formula:
in the formula, WGeneral assemblyThe total weight of the mixture sample is N, and the number of the collection hoppers arranged in the detection device is N.
Taking four collection hoppers and four particle size grades as examples, the total weight of the mixture samples was: wGeneral assembly＝W1+W2+W3+W4。
And S63, determining the grain size composition percentage of the mixture sample with different grain sizes according to the weight of the mixture sample corresponding to different grain sizes and the total weight of the mixture sample, so as to determine the grain size composition of the mixture sample.
And calculating the proportion of the weight of the material corresponding to each granularity to the total weight to determine the granularity composition of the mixture sample.
Determining the grain size composition percentage of the mixture samples with different grain sizes according to the following formula:
in the formula, ωnIs the percentage of the grain size composition of the mixed material samples with different grain sizes, WGeneral assemblyIs the total weight of the mixture sample, WnThe weights of the mixture samples corresponding to different particle sizes.
The granularity composition ratio of the first-level granularity is as follows:
the particle size composition ratio of the secondary particle size is as follows:
the particle size composition ratio of the third-level particle size is as follows:
the particle size composition ratio of the fourth grade particle size:
according to the technical scheme, the method for detecting the particle size composition of the sintering mixture comprises the steps of weighing empty cup weights by using the weighing sensors, discharging the mixture samples in the feeding hopper 1 into the cavity 2 by using the discharging round roller 3, controlling the air blower 4 to blow air into the cavity 2, enabling the mixture samples to fall into the corresponding collecting hoppers 5 in a grading mode under the action of wind power, weighing the mixture weights falling into the material cups from the collecting hoppers 5 by using the weighing sensors 7, and determining the particle size composition of the mixture samples according to the weight of each material cup containing the mixture and the corresponding empty cup weight. According to the method, the sintering mixture is classified by wind power by utilizing the principle of wind power classification, and then the classified materials are weighed, so that the granularity composition of the mixture is calculated.
In a specific implementation, the present invention further provides a computer storage medium, where the computer storage medium may store a program, and the program may include some or all of the steps in each embodiment of the method for detecting a particle size composition of a sintered mixture provided by the present invention when executed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (10)
1. A detection device for particle size composition of a sintering mixture is characterized by comprising: the feeding device comprises a cavity (2), wherein a feeding funnel (1) is arranged at the top of one end of the cavity (2), and the feeding funnel (1) is communicated with the cavity (2); one side of the cavity (2) is provided with a discharging round roller (3), the discharging round roller (3) is positioned below the feeding funnel (1), and the discharging round roller (3) is used for enabling mixture in the feeding funnel (1) to fall into the cavity (2);
an air inlet (21) is formed in one side of the cavity (2), and the air inlet (21) is located below the discharging round roller (3); the air blower (4) is arranged at the air inlet (21), the air blower (4) is used for blowing air into the cavity (2), and the air direction is vertical to the movement direction of the mixture in the cavity (2); a gas discharge pipe (8) is arranged on the other side of the cavity (2), and the air outlet direction of the gas discharge pipe (8) is the same as the air inlet direction of the air blower (4);
a plurality of collecting hoppers (5) for collecting the mixture with different particle sizes are arranged at the bottom of the cavity (2), the collecting hopper (5) for collecting the mixture with small particle size is close to the gas discharge pipe (8), and the collecting hopper (5) for collecting the mixture with large particle size is close to the air inlet (21); the bottom of every collection fill (5) is equipped with corresponding weighing component (6), every the bottom of weighing component (6) is equipped with corresponding weighing sensor (7), weighing sensor (7) are used for weighing the mixture that falls into weighing component (6) through collecting fill (5).
2. The apparatus according to claim 1, further comprising a plurality of sealing valves (10), two sealing valves (10) being provided between the feed hopper (1) and the chamber (2), and two sealing valves (10) being provided at the bottom of each collecting hopper (5).
3. The device according to claim 1, further comprising a filter screen (9), the filter screen (9) being arranged at the connection of the gas outlet pipe (8) and the chamber (2).
4. The device according to claim 1, characterized in that the weighing assembly (6) comprises a cup (61) and a weighing platform (62), the weighing platform (62) being located below the collection hopper (5), the cup (61) being placed on the weighing platform (62), the cup (61) being intended to contain the mix collected by the corresponding collection hopper (5); the weighing sensor (7) is arranged at the bottom of the weighing platform (62).
5. The device according to claim 1, characterized in that a discharge port (22) is arranged between the cavity (2) and the discharging roller (3), and the feeding funnel (1) is communicated with the cavity (2) through the discharge port (22).
6. A method for detecting a particle size composition of a sintering mixture, which is applied to the apparatus for detecting a particle size composition of a sintering mixture according to any one of claims 1 to 5, the method comprising:
weighing the material cups below the corresponding collecting hoppers by using each weighing sensor to obtain the weight of a plurality of empty cups;
controlling the discharging round roller to rotate, so that the mixture sample in the feeding hopper falls into the cavity;
controlling an air blower to blow air into the cavity, so that the falling mixture samples fall into corresponding collecting hoppers according to different particle sizes under the action of the air force;
controlling the opening of a sealing valve at the bottom of each collecting hopper to enable the mixture sample collected in each collecting hopper to fall into the corresponding cup;
weighing the material cups containing the mixture samples by using each weighing sensor to obtain the weight of each material cup containing the mixture;
and determining the grain size composition of the mixture sample according to the weight of each material cup for containing the mixture and the corresponding weight of the empty cup.
7. The method of claim 6, wherein controlling the blower to blow air into the cavity to cause the falling mixture samples to fall into the corresponding collection buckets according to different particle sizes under the action of the air comprises:
controlling the air blower to blow air into the cavity, wherein the direction of the air is vertical to the falling direction of the mixture sample; the method comprises the following steps that under the action of wind power, mixture samples with different particle sizes fall into a collecting hopper close to a gas discharge pipe, and mixture samples with large particle sizes fall into a collecting hopper close to an air inlet.
8. The method of claim 6, wherein determining the grain size composition of the mix sample based on the weight of each cup containing the mix and the corresponding weight of the empty cup comprises:
determining the weight of the mixture sample corresponding to different granularities according to the weight of each material cup for containing the mixture and the corresponding weight of the empty cup;
determining the total weight of the mixture sample according to the weights of the mixture samples corresponding to different granularities;
and determining the grain size composition percentage of the mixture samples with different grain sizes according to the weight of the mixture samples corresponding to the different grain sizes and the total weight of the mixture samples so as to determine the grain size composition of the mixture samples.
9. The method of claim 8, wherein the weights of the batch samples for different particle sizes are determined from the weight of each cup containing the batch and the corresponding weights of the plurality of empty cups according to the following formula:
Wn＝Wtn-Wkn；
in the formula, WnWeight of the blend sample corresponding to different particle sizes, Wtn is the weight of each cup containing the mixture, Wkn is the empty cup weight of each material cup.
10. The method of claim 8, wherein the grain size composition percentage of the mix sample is determined from the weight of the mix sample and the total weight of the mix sample corresponding to different grain sizes according to the following formula:
in the formula, ωnIs the percentage of the grain size composition of the mixed material samples with different grain sizes, WGeneral assemblyIs the total weight of the mixture sample, WnThe weight of the mixture samples corresponding to different granularities, and N is the number of the collection hoppers arranged in the detection device.
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