CN112946170A - Method for measuring mud content of machine-made sand for building - Google Patents
Method for measuring mud content of machine-made sand for building Download PDFInfo
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Abstract
The invention discloses a method for measuring the mud content of machine-made sand for buildings, which comprises the following steps: (1) weighing n groups of standard machine-made sand and preparing n groups of standard machine-made sand washing liquid; (2) measuring the titration amount of a methylene blue solution of the standard mud content mechanism sand washing liquid during automatic quantitative titration color mutation by using a color recognition algorithm model to form a mud content standard titration curve; (3) obtaining a curve calibration model through function fitting, and establishing a calibration model of a mud content standard titration curve; (4) and recording the titration amount of the methylene blue solution when the titration end point color is suddenly changed by an automatic color recognition model method, and calculating according to a calibration model of a titration amount mud content standard curve to obtain the mud content of the machine-made sand sample. The method can simplify the testing process, quickly and accurately measure the mud content of the machine-made sand, and reduce human factor errors by correcting the model.
Description
Technical Field
The invention relates to a method for measuring the mud content of machine-made sand for buildings.
Background
According to the national standard GB/T14684 building sand of the people's republic of China, at present, the building sand is mainly divided into natural sand and machine-made sand, the mud content of the natural sand is characterized by measuring the mass difference of samples before and after washing, and the machine-made sand is characterized by measuring an MB value through a methylene blue solution. The quality method is manually operated, the steps of washing, drying, weighing and the like are needed for many times when the mud content of the natural sand is measured, the method is complicated, the consumed time is long, and the automatic and instrumented rapid measurement is difficult to realize; the MB value method is also very complicated to measure the mud content of the machine-made sand, consumes time, has large judgment error through human eye titration end points, has low accuracy and is difficult to realize automatic rapid measurement. The invention has the following patents: an automatic device and a method (201810313381.7) for measuring the mud content of raw sand based on a constant volume method are provided to solve the problems of complicated steps and long time consumption of the existing method for measuring the mud content of the raw sand, a water level probe is used for controlling the distance between the water level in a sand washing cup and the bottom of the sand washing cup to be 125mm, on the basis of meeting the same water level, a pressure sensor is used for respectively measuring the mass when clean water is filled in the sand washing cup, the mass when a mixture of sand and water which are not washed away with mud is filled in the sand washing cup and the mass when the mixture of sand and water which are washed away with mud is filled in the sand washing cup, a formula is used for deducing the relation between the three masses and the mud content, and finally an expression of the mud content is obtained, namely the mud content is measured, and the method can not measure the mud content of machine-made sand aiming at the mud content of the casting raw sand, and the sand is not dried in the process of measuring the mass, so that the measurement error is easy to generate. The invention has the following patents: (201922124586.3) discloses a sand mud content detection device for building mortar, which can obtain the sand mud content after calculation by weighing the mass change of sand particles before and after cleaning, cannot determine the mud content of machine-made sand, and easily generates measurement errors because the sand is not dried in the process of determining the mass.
The present invention has been made in view of the above-mentioned problems.
Disclosure of Invention
Aiming at the defects of the conventional method for measuring the building sand, the invention aims to provide a method for quickly and accurately measuring the mud content of the building machine-made sand, and the implementation scheme of automatic equipment is convenient to put forward on the basis of the method.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a method for measuring the mud content of machine-made sand for buildings comprises the following steps:
(1) preparing a machine-made sand washing liquid with standard mud content,
weighing n groups of machine-made sand standard substances, wherein n is more than or equal to 3, and each group of standard substancesThe mass of the sand is A, and the mud content of each group of machine-made sand is X1，X2，……，XnWashing each group of standard products with clean water with the volume of B, filtering after washing, collecting all washing liquid, and preparing n groups of standard machine-made sand washing liquid;
(2) a standard titration curve of the mud content is made,
uniformly dropping a methylene blue solution with the concentration of D into each group of standard mechanism sand washing liquid through an automatic titration device, recording the titration amount of the methylene blue solution when the titration end point color is suddenly changed through a color identification model method, and making a standard curve by using a point tracing method by taking the mud content as a horizontal coordinate and the titration amount of the methylene blue solution as a vertical coordinate;
(3) correcting the mud content standard titration curve in the step (2), establishing a correction model of the mud content standard titration curve,
fitting a mathematical relation between the methylene blue solution titration amount and the mud content by using a linear function, namely setting a relation function of the mud content X and the methylene blue solution titration amount Y as F (X, Y), regression variables as m and b, the mud content of any group of standard products as Xi, i as 1, 2, … … and n, and the corresponding methylene blue solution titration amount as Yi, wherein a curve correction model is as follows:
Y＝F(X,Y)＝mX+b
wherein
(4) Determining the mud content of unknown machine-made sand
Weighing a mechanism sand sample with the mass of A, washing with clear water with the volume of B, filtering after washing, collecting all washing liquid, dripping a methylene blue solution with the concentration of D into the washing liquid of the mechanism sand sample at a constant speed through an automatic titration device, recording the titration amount of the methylene blue solution when the titration end point color is mutated through a color identification model method, substituting the titration amount of the methylene blue solution into a correction model of a mud content standard titration curve, and calculating the mud content of the sample.
In a preferred aspect of the present invention, the value of n satisfies the following expression: n is more than or equal to 5.
Optionally, the color recognition model method employs an RGB color algorithm model, a YCrCb color algorithm model, or an HSV color algorithm model.
In a preferred embodiment of the present invention, in step (1), the machine-made sand is washed and then filtered by using a 75 micron double-layer sieve.
In a preferred embodiment of the present invention, A has a value of 10g to 10000 g.
In a preferred embodiment of the present invention, the value of B is 12mL to 20000 mL.
In a preferred embodiment of the invention, the clean water with the volume B has a mass of 1.2A-3A.
In a preferred embodiment of the present invention, the titration rate of the auto-titrator is controlled between 0.01ml and 0.05ml per 10 seconds.
In a preferred embodiment of the invention, D has a value of 5g/L to 20 g/L.
The invention has the beneficial effects that: in the invention, a color recognition algorithm model is utilized to determine the titration amount of a series of methylene blue solution of standard mechanism sand washing liquid with the mud content when the color is mutated in an automatic quantitative titration manner, so as to form a mud content standard titration curve, and then a linear function is used to fit the mathematical relationship between the titration amount of the methylene blue solution and the mud content, so as to correct the determined standard curve of the mechanism sand standard product. And finally, uniformly dripping the methylene blue solution into the washing liquid of the mechanism sand sample to be detected through an automatic titration device, recording the titration amount of the methylene blue solution when the titration end point color is suddenly changed by adopting an automatic color identification model method, and calculating according to a calibration model of a titration amount mud content standard curve to obtain the mud content of the mechanism sand sample. The method can simplify the testing process, quickly and accurately determine the mud content of the machine-made sand, reduce human factor errors by correcting the model, and develop related automatic quick determination equipment on the basis of the method.
Drawings
FIG. 1 is a schematic view of the process for measuring the mud content of machine-made sand.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly. In addition, the descriptions related to "preferred", "less preferred", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "preferred" or "less preferred" may explicitly or implicitly include at least one such feature.
Example 1
The embodiment provides a method for measuring the mud content of machine-made sand for buildings, which comprises the following steps:
(1) preparing a machine-made sand washing liquid with standard mud content,
weighing 20 groups of standard machine-made sand, wherein the mass of each group of standard products is 150g, the mud content of each group of machine-made sand is 0, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8% and 2.0%, each group of standard products is washed by clear water with the volume of 300ml, filtering is carried out after washing is finished, all washing liquids are collected, and 20 groups of standard machine-made sand washing liquids are manufactured;
(2) a standard titration curve of the mud content is made,
uniformly dropping a methylene blue solution with the concentration of D into each group of standard mechanism sand washing liquid through an automatic titration device, recording the titration amount of the methylene blue solution when the titration end point color is suddenly changed through a color identification model method, and making a standard curve by using a point tracing method by taking the mud content as a horizontal coordinate and the titration amount of the methylene blue solution as a vertical coordinate;
(3) correcting the mud content standard titration curve in the step (2), establishing a correction model of the mud content standard titration curve,
fitting a mathematical relation between the methylene blue solution titration amount and the mud content by using a linear function, namely setting a relation function of the mud content X and the methylene blue solution titration amount Y as F (X, Y), regression variables as m and b, the mud content of any group of standard products as Xi, i as 1, 2, … … and 20, and the corresponding methylene blue solution titration amount as Yi, wherein a curve correction model is as follows:
Y＝F(X,Y)＝mX+b
wherein
(4) Determining the mud content of unknown machine-made sand
Weighing a 150 g-mass mechanism sand sample, washing with 300 ml-volume clear water, filtering after washing, collecting all washing liquids, uniformly dropping a methylene blue solution with a concentration of D into the washing liquid of the mechanism sand sample through an automatic titration device, wherein the methylene blue solution is the same as the methylene blue solution in the step (2), recording the titration amount of the methylene blue solution when the titration end point color is mutated through a color recognition model method, substituting the titration amount of the methylene blue solution into a correction model of a mud content standard titration curve, and calculating the mud content of the sample.
The color recognition model method may employ an RGB color algorithm model, a YCrCb color algorithm model, or an HSV color algorithm model.
In a preferred embodiment of the present invention, in step (1), the machine-made sand is washed and then filtered by using a 75 micron double-layer sieve. The filtering is carried out by adopting a 75-micron double-layer sieve, particles smaller than 0.075mm can be fully discharged at the same time, so that the defect that the result is inaccurate due to the fact that sand grains are easy to run off according to the existing detection standard is overcome, and the defect that the result is inaccurate due to the fact that the particles smaller than 0.075mm cannot be fully washed off according to the existing detection standard is overcome.
In the step (1) and the step (4), the mass of each group of machine-made sand standard substance is not limited to 150g, and generally, the mass of the standard substance can be between 10g and 10000 g; the volume of the clear water used by each group of machine-made sand standard is not limited to 300mL, and generally, the volume of the clear water can be 12 mL-20000 mL.
Preferably, when the standard machine-made sand washing liquid with the mud content is prepared in the step (1), the mass of the adopted clean water in each group of tests is 1.2-3 times that of the machine-made sand standard product. By adopting the scheme, the machine-made sand standard product can be completely immersed in water and fully washed, and meanwhile, the turbidity of washing liquid can be guaranteed to be in a reasonable range, and sand mud is uniformly distributed in the washing liquid.
The titration rate of the auto-titrator is controlled between 0.01ml and 0.05ml per 10 seconds, with a titration rate of 0.05ml per 10 seconds being optimal.
The concentration D of the methylene blue solution is 5 g/L-20 g/L, wherein the concentration is 10 g/L.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which can be directly or indirectly applied to other related technical fields without departing from the spirit of the present invention, are intended to be included in the scope of the present invention.
Claims (9)
1. A method for measuring the mud content of machine-made sand for buildings is characterized by comprising the following steps:
(1) preparing a machine-made sand washing liquid with standard mud content,
weighing n groups of machine-made sand standard substances, wherein n is more than or equal to 3, the mass of each group of standard substances is A, and the mud content of each group of machine-made sand is X1，X2，……，XnWashing each group of standard substance with clear water with the volume of B, filtering after washing, collecting all washing liquid, and making n groups of standard substancesMachine-made sand washing liquid;
(2) a standard titration curve of the mud content is made,
uniformly dropping a methylene blue solution with the concentration of D into each group of standard mechanism sand washing liquid through an automatic titration device, recording the titration amount of the methylene blue solution when the titration end point color is suddenly changed through a color identification model method, and taking the mud content as a horizontal coordinate, the titration amount of the methylene blue solution as a vertical coordinate and a standard curve;
(3) establishing a correction model of a mud content standard titration curve,
fitting a mathematical relation between the methylene blue solution titration amount and the mud content by using a linear function, namely setting a relation function of the mud content X and the methylene blue solution titration amount Y as F (X, Y), regression variables as m and b, the mud content of any group of standard products as Xi, i as 1, 2, … … and n, and the corresponding methylene blue solution titration amount as Yi, wherein a curve correction model is as follows:
Y＝F(X,Y)＝mX+b
wherein
(4) Determining the mud content of unknown machine-made sand
Weighing a mechanism sand sample with the mass of A, washing with clear water with the volume of B, filtering after washing, collecting all washing liquid, dripping a methylene blue solution with the concentration of D into the washing liquid of the mechanism sand sample at a constant speed through an automatic titration device, recording the titration amount of the methylene blue solution when the titration end point color is mutated through a color identification model method, substituting the titration amount of the methylene blue solution into a correction model of a mud content standard titration curve, and calculating the mud content of the sample.
2. The method for measuring the mud content of the machine-made sand for buildings according to claim 1, wherein the value of n satisfies the following expression: n is more than or equal to 5.
3. The method for determining the silt content of the machine-made sand for buildings according to claim 1, wherein the color identification model method adopts an RGB color algorithm model, a YCrCb color algorithm model or an HSV color algorithm model.
4. The method for measuring the mud content of the machine-made sand for buildings according to claim 1, wherein in the step (1), the machine-made sand is filtered by a 75 micron double-layer sieve after being washed.
5. The method for measuring the mud content of the machine-made sand for buildings according to claim 1, wherein the value of A is 10g to 10000 g.
6. The method for determining the mud content of the machine-made sand for buildings according to claim 5, wherein the value of B is 12mL to 20000 mL.
7. The method for measuring the mud content of the machine-made sand for buildings according to claim 1, 5 or 6, wherein the clear water with the volume B has the mass of 1.2A-3A.
8. The method for measuring the mud content of the machine-made sand for buildings according to claim 1, wherein the titration rate of the automatic titration device is controlled to be 0.01ml to 0.05ml per 10 seconds.
9. The method for measuring the mud content of the machine-made sand for buildings according to claim 1, wherein the value of D is 5g/L to 20 g/L.
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