CN112014550A - Method and device for detecting moisture content of aggregate and machine-readable storage medium - Google Patents
Method and device for detecting moisture content of aggregate and machine-readable storage medium Download PDFInfo
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Abstract
The invention relates to the field of engineering machinery, and discloses a method and a device for detecting aggregate moisture content and a machine-readable storage medium, wherein the method comprises the following steps: determining the aggregate thickness of the aggregate moisture content detection point; detecting the moisture content of the moisture content detection points, wherein the aggregate thickness corresponds to the moisture content one to one for any moisture content detection point; for any moisture content detection point, determining the moisture content of the moisture content detection point corresponding to the preset standard thickness based on the aggregate thickness, the preset standard thickness and the moisture content error per unit thickness; and determining the moisture content of the aggregate based on the determined moisture content corresponding to the preset standard thickness. Therefore, the water content detection precision is improved.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a method and a device for detecting aggregate moisture content and a machine-readable storage medium.
Background
Concrete is one of the most widely used materials in construction engineering, and economic and performance indexes of the concrete have a significant relation to the quality and cost of the whole construction engineering. The concrete mixing plant is a combined mechanical device for producing concrete in a centralized way, can weigh all ingredients of the concrete according to a set formula, send the ingredients into a mixer in a specified sequence for mixing, and discharge the ingredients into a concrete conveying vehicle after mixing for a certain time, thereby completing the mixing production of the concrete.
In the production process of concrete, the moisture change in the sandstone aggregate used in the concrete affects the accuracy of concrete proportioning, and the moisture content of the sandstone aggregate needs to be detected to adjust and compensate the water content and the sand content in the concrete formula. The prior art typically uses either a contact moisture sensor for sensing or a non-contact moisture sensor for sensing.
Contact moisture sensor: as shown in figure 1, most of the existing concrete mixing plants adopt the installation mode to detect the moisture content of aggregate on line, the contact type moisture sensor is installed below an aggregate bin, and when a bin discharge door is opened and the aggregate falls and flows through the surface of the moisture sensor in a continuous and uniform state, the contact type moisture sensor can detect the moisture content value of the falling aggregate and upload the moisture content value to a production control system.
Non-contact moisture sensor: as shown in figure 2, the existing few concrete mixing stations adopt the installation mode to carry out on-line detection on the moisture content of aggregate, the sensors can transmit microwave signals with specific frequency to a detected medium, the moisture content in the material is judged according to the linear relation between the absorption of polar molecules of water molecules in the medium on microwave energy and the moisture content of the water molecules, the physical contact with the detected medium cannot occur in the detection process, and the adhesion and abrasion which possibly occur between the material and the sensors are avoided.
Contact moisture sensor: as shown in figure 1, the contact type moisture sensor can only measure the real-time moisture content of a single aggregate, and the aggregate material flow is in continuous contact friction with the ceramic panel of the moisture sensor, so that the material is easy to stick, the service life is short, and meanwhile, the measurement precision is also easy to be influenced by the quality of the gravel. The detection mode hardly meets the requirements of the mixing plant on cost and detection precision.
Non-contact moisture sensor: as shown in FIG. 2, the hardware cost of the non-contact type moisture sensor is relatively high, but the hardware cost is relatively high, the real-time moisture content of multiple aggregates (3 types or more) can be measured, the aggregate material flow is not in contact with the probe of the moisture sensor, the service life is long, meanwhile, compared with the measurement precision, the contact type moisture sensor is not easily influenced by the quality of sand, the detection precision is relatively high, and the precision requirement of a mixing plant on automatic detection can be met.
However, in the actual concrete production process, all the sandstone aggregates sequentially pass through the conveying belt according to the fixed sequence set by the production control system, and the non-contact type moisture sensor can respectively detect the moisture content of various sandstone aggregates passing below in real time. Generally speaking, the type of the current aggregate to be measured is identified based on an unloading control signal of an aggregate weighing hopper and calculation during aggregate delivery delay, a detection system immediately controls the switching of a built-in moisture model of a moisture sensor after identifying the type of the current aggregate, the moisture sensor obtains a real-time moisture content detection value in real time, and meanwhile, an average measurement value in the delivery time is used as a real-time measurement value of the current aggregate.
Meanwhile, according to the measurement principle of the non-contact type moisture sensor, the measured material needs to pass through the measurement area of the sensor in a stable distribution thickness, and then higher measurement precision can be obtained. Actually, aggregate weighing hopper is along with throwing the material time, and the blanking can reduce gradually, and material blanking later stage distributes unevenly and has the tails condition, and moisture sensor detects the value on the low side under the less condition of aggregate, can cause the influence to moisture content detection precision. The general rule of sand and stone distribution (more in the middle and less at two ends) in the process of delivery is determined by the mechanical structure of the feeding device, so that the general rule is ubiquitous in the actual production process.
Disclosure of Invention
It is an object of the present invention to provide a method and apparatus for detecting moisture content of aggregate and a machine readable storage medium which solve, or at least partially solve, the above technical problems.
In order to achieve the above object, an aspect of the present invention provides a method for detecting a moisture content of aggregate, the method comprising: determining the aggregate thickness of the aggregate moisture content detection point; detecting the moisture content of the moisture content detection points, wherein the aggregate thickness corresponds to the moisture content one to one for any moisture content detection point; determining the moisture content of the moisture content detection point corresponding to the preset standard thickness based on the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error aiming at any moisture content detection point; and determining the moisture content of the aggregate based on the determined moisture content corresponding to the preset standard thickness.
Optionally, for any moisture content detection point, before determining, based on the aggregate thickness, a preset standard thickness, and a preset unit thickness moisture content error, a moisture content corresponding to the preset standard thickness at the moisture content detection point, the method further includes: and comparing the relationship between the aggregate thickness and a preset thickness threshold, wherein the condition that the moisture content corresponding to the preset standard thickness is determined based on the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error is that the aggregate thickness is greater than the preset thickness threshold.
Optionally, the preset water cut per unit thickness error is determined based on: performing linear fitting on the aggregate thickness and the moisture content of the moisture content detection point to obtain a linear relation between the moisture content and the aggregate thickness; and determining the error of the preset unit thickness water content based on the slope in the linear relation.
Optionally, the linear fitting of the aggregate thickness and the moisture content at the moisture content detection points is a linear fitting based on a least square method.
Accordingly, another aspect of the present invention provides an apparatus for detecting moisture content of aggregate, the apparatus comprising: the aggregate thickness determining module is used for determining the aggregate thickness of the moisture content detecting point of the aggregate; the moisture content detection module is used for detecting the moisture content of the moisture content detection points, wherein the aggregate thickness corresponds to the moisture content one to one for any moisture content detection point; the preset standard thickness water content determining module is used for determining the water content of the water content detection point corresponding to the preset standard thickness according to any water content detection point and based on the aggregate thickness, the preset standard thickness and the preset unit thickness water content error; and the moisture content determining module is used for determining the moisture content of the aggregate based on the determined moisture content corresponding to the preset standard thickness.
Optionally, the preset standard thickness water content determination module is further configured to: and for any moisture content detection point, comparing the relationship between the aggregate thickness and a preset thickness threshold value before determining the moisture content corresponding to the preset standard thickness by the moisture content detection point based on the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error, wherein the condition that the moisture content corresponding to the preset standard thickness is determined by the moisture content detection point based on the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error is that the aggregate thickness is greater than the preset thickness threshold value.
Optionally, the preset water cut per unit thickness error is determined based on: performing linear fitting on the aggregate thickness and the moisture content of the moisture content detection point to obtain a linear relation between the moisture content and the aggregate thickness; and determining the error of the preset unit thickness water content based on the slope in the linear relation.
Optionally, the linear fitting of the aggregate thickness and the moisture content at the moisture content detection points is a linear fitting based on a least square method.
In addition, another aspect of the present invention also provides a machine-readable storage medium having stored thereon instructions for causing a machine to execute the above-mentioned method.
Through above-mentioned technical scheme, the moisture content that will detect is converted into the moisture content that corresponds to preset standard thickness, and the moisture content of aggregate is confirmed based on the moisture content that corresponds to preset standard thickness to make the moisture content that the aggregate moisture content of confirming used all correspond to preset standard thickness, realized confirming the moisture content of aggregate under the even condition of thickness, thereby improved moisture content detection precision.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a contact moisture sensor;
FIG. 2 is a schematic view of a non-contact moisture sensor;
FIG. 3 is a flow chart of a method for detecting moisture content of aggregate according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a non-contact type online detection scheme for water content of sand according to another embodiment of the present invention;
FIG. 5 is a flow chart of the sand water content detection according to another embodiment of the present invention;
FIG. 6 is a graph showing a linear relationship between a measured value of the moisture content of the aggregate (Y) and a measured value of the thickness of the aggregate (X) according to another embodiment of the present invention; and
fig. 7 is a block diagram illustrating the structure of an apparatus for detecting the moisture content of aggregate according to an embodiment of the present invention.
Description of the reference numerals
1 aggregate thickness determining module 2 preset standard thickness water content determining module
3 moisture content determining module 4 moisture content detecting module
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
One aspect of embodiments of the present invention provides a method for detecting moisture content of aggregate. Wherein, the aggregate refers to the granular material which plays the role of framework and filling in the concrete, mainly comprising sand and stone, and the types of the aggregate used in the concrete are usually 3 to 5.
Fig. 3 is a flowchart of a method for detecting moisture content of aggregate according to an embodiment of the present invention. As shown in fig. 3, the method includes the following.
In step S30, the aggregate thickness at the aggregate moisture content detection point is determined. For example, a height probe may be used to detect the height of the aggregate on the conveyor belt, i.e. the thickness of the aggregate.
In step S31, the moisture content at the moisture content detection points is detected, and the aggregate thickness and the moisture content correspond to each other for any one of the moisture content detection points. The moisture content detection points can be any point in the aggregate, and the aggregate thickness and the moisture content of each moisture content detection point can be ensured to be in one-to-one correspondence. Further, the moisture content may be detected using a non-contact moisture sensor. For example, in the process of conveying aggregate by a conveyor belt, a height probe is used for detecting the thickness of one point in the aggregate, and then a non-contact type moisture sensor is used for detecting the moisture content of the point, wherein the point is a moisture content detection point. Specifically, it may be set that, in the process of conveying the aggregate by the conveyor belt, the height probe is located at a preset distance upstream of the non-contact type moisture sensor, that is, in the process of conveying the aggregate by the conveyor belt, the aggregate passes through the height probe and then passes through the non-contact type moisture sensor, wherein the preset distance is set based on the reaction time of calculating the height of the aggregate (the thickness of the aggregate) by the height probe and the speed of the conveyor belt, so as to ensure the one-to-one correspondence relationship between the thickness of the aggregate and the moisture content at a moisture content detection point. In addition, in the embodiment of the present invention, the order of determining the aggregate thickness and detecting the moisture content is not fixed, and the order is not limited thereto, and the aggregate thickness at a moisture content detection point may be determined first, and then the moisture content at the point may be determined; the moisture content of a moisture content detection point can be determined firstly, and then the aggregate thickness of the point is determined, so long as the one-to-one correspondence relationship between the moisture content and the aggregate thickness for one point in the aggregate is ensured.
In step S32, for any moisture content detection point, based on the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error, a moisture content corresponding to the preset standard thickness at the moisture content detection point is determined, that is, a moisture content corresponding to the time when the aggregate thickness at the moisture content detection point is converted to the preset standard thickness is determined. Wherein, the error of the water content of the preset unit thickness can be determined according to specific conditions. For example, the thickness is in millimeters (mm), and the error of the moisture content per predetermined thickness may be an error of the moisture content per millimeter, or an error of the moisture content per 10 mm. Specifically, for any moisture content detection point, determining that the detected moisture content corresponds to a preset standard thickness, comparing the aggregate thickness with the preset standard thickness, correcting the moisture content when the aggregate thickness is not equal to the preset standard thickness, calculating a thickness difference between the aggregate thickness and the preset standard thickness, calculating a moisture content difference to be added or subtracted when the aggregate thickness of the moisture content detection point is converted into the preset standard thickness by combining a preset unit thickness moisture content error, and adding or subtracting the moisture content difference from the detected moisture content difference to obtain the moisture content of the moisture content detection point corresponding to the preset standard thickness; and under the condition that the thickness of the aggregate is equal to the preset standard thickness, the detected moisture content is the moisture content corresponding to the preset standard thickness detected by the moisture content. Specifically, multiple tests show that the detection value of the moisture content is influenced by the thickness of the measured aggregate, the larger the thickness is, the higher the detection value is, and the smaller the thickness is, the lower the detection value is, therefore, when the thickness of the aggregate is smaller than the preset marked thickness, the detected moisture content is added with a moisture content difference value, and when the thickness of the aggregate is larger than the preset standard thickness, the detected moisture content is subtracted by the moisture content difference value. For example, at a certain moisture content detection point, the aggregate thickness is 80mm, the detected moisture content is 7.3%, the preset standard thickness is 100mm, the error of the moisture content per unit thickness is 0.2% of the difference per 10mm, the aggregate thickness is not equal to the preset standard thickness and is smaller than the preset standard thickness, the difference between the aggregate thickness and the preset standard thickness is 20mm, the error of the moisture content per unit thickness is 0.2% of the difference per 10mm, the difference of the moisture content is 0.4%, the detected moisture content is 7.3% plus the moisture content difference of 0.4% to obtain 7.7%, and 7.7% is the moisture content corresponding to the preset standard thickness at the moisture content detection point. In addition, the difference value between the aggregate thickness and the preset standard thickness can be calculated for any moisture content detection point no matter whether the aggregate thickness is equal to the preset standard thickness or not. Specifically, the method is used for subtracting the aggregate thickness from the preset standard thickness to obtain a thickness difference value, wherein the thickness difference value can be a positive number, a negative number or zero; calculating a water content error by combining the water content error of the preset unit thickness, wherein the water content error can be positive or negative or zero; and adding the moisture content error to the detected moisture content to obtain the moisture content of the moisture content detection point corresponding to the preset standard thickness. Similarly, when the aggregate thickness is subtracted from the preset standard thickness to obtain a thickness difference value, the moisture content detection point is obtained by subtracting the moisture content error from the detected moisture content to obtain the moisture content corresponding to the preset standard thickness. In addition, in the embodiment of the present invention, the preset standard thickness may be 100mm according to specific situations, and thus, the present invention is not limited thereto.
In step S33, the moisture content of the aggregate is determined based on the determined moisture content corresponding to the preset standard thickness. Specifically, for all the moisture content detection points, the determined moisture content corresponding to the preset standard is averaged, and the average value is the moisture content of the detected aggregate.
Through above-mentioned technical scheme, the moisture content that will detect is converted into the moisture content that corresponds to preset standard thickness, and the moisture content of aggregate is confirmed based on the moisture content that corresponds to preset standard thickness to make the moisture content that the aggregate moisture content of confirming used all correspond to preset standard thickness, realized confirming the moisture content of aggregate under the even condition of thickness, thereby improved moisture content detection precision.
Optionally, in an embodiment of the present invention, before determining, for any one of the moisture content detection points, a moisture content corresponding to a preset standard thickness of the moisture content detection point based on the aggregate thickness, the preset standard thickness, and the preset unit thickness moisture content error, the method further includes: and comparing the relationship between the aggregate thickness and a preset thickness threshold, wherein the condition that the moisture content of the moisture content detection point corresponding to the preset standard thickness is determined based on the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error is that the aggregate thickness is greater than the preset thickness threshold. For any moisture content detection point, firstly judging the relation between the aggregate thickness and a preset thickness threshold, determining the moisture content of the moisture content detection point corresponding to a preset standard thickness under the condition that the aggregate thickness is greater than the preset thickness threshold, and further using the determined moisture content corresponding to the preset standard thickness for calculating the moisture content of the aggregate; and when the thickness of the aggregate is smaller than or equal to the preset thickness threshold value, discarding the related data of the moisture content detection point. When the aggregate thickness is smaller, the aggregate is less, the detected moisture content is less accurate, the data with smaller aggregate thickness is abandoned, and the moisture content detection precision is further improved.
Optionally, in the embodiment of the present invention, the moisture content per unit thickness may be determined by a linear fitting method. Specifically, linear fitting is carried out on the aggregate thickness and the moisture content of all moisture content detection points to obtain a linear relation between the moisture content and the aggregate thickness, and the moisture content error of the preset unit thickness is determined based on the slope in the linear relation. For example, the thickness unit is mm, and if the error of the moisture content per millimeter of the preset unit thickness is the error of the moisture content per millimeter, the slope is the error of the moisture content per preset unit thickness; if the error of the water content per preset unit thickness is the error of the water content per 10 millimeters, the slope is multiplied by 10 to obtain the error of the water content per preset unit thickness. Optionally, when linear fitting is performed, the aggregate thickness and the moisture content corresponding to the moisture content detection point with the aggregate thickness greater than the preset thickness threshold value may be selected for linear fitting, so as to improve the accuracy of calculation. Alternatively, in the embodiment of the present invention, the linear fitting may be performed based on a least square method.
The method for detecting the moisture content of the aggregate provided by the embodiment of the invention is exemplarily described below with reference to fig. 4 to 6. In this example, the moisture content detection is performed using a noncontact moisture sensor. In the example, 1) a control mode based on a weighing hopper unloading control signal and aggregate delivery delay calculation is adopted, meanwhile, a non-contact type moisture content detection technology of aggregate thickness identification is combined, in the aggregate delivery process, effectiveness identification and correction compensation are carried out on current moisture content detection data of a moisture sensor according to the thickness identification result of aggregate on a conveyor belt, and the obtained effective data is subjected to mean value processing to serve as the detection value of the moisture content of the currently delivered aggregate; 2) the detected value of the water content is directly uploaded to a concrete production system to be used as the basis for adjusting the concrete proportion.
As shown in fig. 4, in this example, on the basis of the weighing hopper discharge control signal and the aggregate delivery delay calculation control mode, the result of identifying the aggregate thickness is combined to perform online detection on the aggregate moisture content, and the result is uploaded to the production system to be used as the basis for concrete proportioning adjustment.
As shown in fig. 5, the aggregate metering is started, after the time t is equal to L/v, the type of the aggregate is identified, the non-contact type moisture sensor is started, the moisture model is called, and the collection of the real-time moisture content measurement data of the aggregate is started; and starting a height sensor to start to collect the thickness of the aggregate of the belt. L is the distance between corresponding positions of the discharge door and the moisture sensor on the conveyor belt, and t obtained after the belt speed v is divided is the time required by the aggregates from the position of the discharge door to the position below the moisture sensor. And judging whether the aggregate thickness value is larger than a preset thickness threshold value. And under the condition that the aggregate thickness value is larger than the preset thickness threshold value, correcting the real-time moisture content measurement data according to the aggregate thickness value, namely determining the moisture content corresponding to the preset standard thickness in the embodiment. And filtering out real-time moisture content measurement data as invalid data for filtering treatment under the condition that the aggregate thickness value is less than or equal to a preset thickness threshold value. And (4) closing the weighing door of the aggregate, carrying out mean value processing on the obtained effective data to be used as a moisture content detection value of the current aggregate, and transmitting the result to an upper computer control system in real time to be used as a basis for adjusting the concrete formula.
The implementation of the solution in this example is further elucidated and described below.
1) The non-contact type moisture sensor in this example is installed right above the conveyor belt, and moisture content detection is performed on various aggregates delivered through the conveyor belt in sequence. The sensor realizes the moisture content detection by utilizing the principle that the linear correlation exists between the absorption rate of the measured aggregate to the emission energy signal and the moisture content of the measured aggregate. And for different types of aggregates, the moisture models reflecting the corresponding relation between the measured value of the moisture sensor and the moisture content of the aggregates are different. The moisture model of each aggregate is obtained by linear fitting of the moisture value obtained by drying and weighing the measured aggregate sample in a laboratory and the energy signal attenuation value detected by the sensor at the standard thickness (for example, 100 mm) of the aggregate. And the moisture models corresponding to the different aggregates are stored in the moisture sensor and can be switched and called as required.
2) The control mode of starting/stopping the moisture sensor and the switching of the built-in moisture model are carried out through the unloading control signal of the aggregate weighing hopper and the aggregate delivery delay calculation. Specifically, when the weighing hopper corresponding to a certain aggregate starts/stops feeding, the detection of the moisture sensor is started/stopped after the set time is delayed, and meanwhile, the moisture sensor is controlled to call the moisture model corresponding to the aggregate. The setting of the time delay duration is determined according to the length from the weighing hopper corresponding to the aggregate to the conveyor belt of the moisture sensor and the running speed of the conveyor belt, so that the sensor can normally measure when the aggregate passes below the moisture sensor, for example, the distance between the weighing hopper of the aggregate and the corresponding position of the moisture sensor on the conveyor belt is 35 meters, the running speed of the conveyor belt is 2.5 meters/second, and the time delay duration corresponding to the aggregate is 35/2.5-14 seconds.
3) The change of aggregate thickness can influence the precision that the moisture content detected in actual production, for reducing the influence that this kind of change brought measurement accuracy, the thickness of aggregate on the conveyer belt is measured to the installation height probe above the conveyer belt. The height probe calculates the thickness of the measured aggregate according to the time delay from the transmission to the reception of the ultrasonic signal.
Meanwhile, the device position of the height sensor is positioned at the upstream of the moisture sensor, and the reason is that in the actual production, a certain hysteresis exists between the detection value output by the height probe and the actual height in terms of time, namely, the measurement delay (which is simply the time from the ultrasonic wave emission of the height probe to the echo reception, the filtering, the arithmetic operation and the result output), and the measurement delay is related to the design of the sensor and is generally fixed. The distance is used for compensating the measurement delay so that the aggregate consistency measured by the height sensor and the moisture sensor is ensured, namely, the aggregate thickness and the moisture content are in one-to-one correspondence for a moisture content detection point in the embodiment of the invention. For example, if the height probe measures 200 ms delay and the conveyor belt runs at 2.5 m/s, the height probe is mounted 2.5 × 200/1000 m upstream of the moisture sensor.
4) The upper control equipment is preferably an industrial personal computer, the detection value of the moisture sensor is influenced by the thickness of the measured aggregate, the larger the thickness is, the higher the detection value is, and the smaller the thickness is, the lower the detection value is. However, the moisture content detection value is most accurate only when the moisture content is measured at a standard thickness (i.e., the thickness of the measured aggregate when the moisture model is calibrated), it can be considered that there is a linear correlation between the moisture content detection value and the measured thickness within a specific interval (around a preset standard thickness), and the moisture content value (Y) and the height value (X) at each detection time are represented by a Y-X coordinate system, as shown in fig. 6. From the figure, it can be known that the moisture content value has positive correlation with the aggregate thickness value, and the data are subjected to linear fitting by using a least square method, wherein the specific formula is as follows:
wherein k is the slope of the fitted straight line, b is the intercept of the fitted straight line,
the average value of the water content is obtained,
is the average value of the aggregate thickness.
As described above, a linear relationship between the detected aggregate moisture content value (Y) and the measured aggregate thickness value (X), that is, Y ═ k × X + b, can be obtained, and the specific linear relationship is not uniform because the characteristics of each measured aggregate are different.
Therefore, the detection data of the water sensor is collected in real time in the production process, and the detection data of the water content needs to be corrected according to the current aggregate thickness data obtained by the height probe. The specific scheme is as follows:
(1) when the measured value of the aggregate thickness is smaller than a preset thickness threshold (for example, 80 mm), the aggregate thickness is considered not to reach the minimum thickness for detecting the moisture content, and the moisture content data detected at the current moment is invalid data.
(2) When the measured value of the aggregate thickness is larger than a preset thickness threshold (for example, 80 mm), the moisture content data detected at the current moment is considered to be valid, but compensation and correction are required according to the measured value of the aggregate thickness. The specific modification method can be understood with reference to fig. 6. As shown in fig. 6, for a specific type of aggregate, there is a linear correlation between the moisture content detection value and the aggregate thickness in a specific interval (around a preset standard thickness), and the linear correlation is obtained by statistical fitting of the moisture sensor measurement values at different aggregate thicknesses, so as to perform compensation and correction on the moisture content detection value based on the linear correlation.
For example, as shown in fig. 6, when the moisture content detection value is 8.8% when a certain aggregate thickness is 110 mm, and it is known from a linear relationship that the moisture content detection value is 0.2% different from that at a standard thickness (100 mm) when the aggregate thickness is 110 mm, the current moisture content detection value is corrected to 8.6%. That is, based on the slope in the linear relationship, the difference between the moisture content of the aggregate at 110 mm and the moisture content of the aggregate at 100mm can be obtained as 0.2%, that is, the moisture content difference in the above embodiment is 0.2%, and the moisture content detected by subtracting 0.2% from 8.8% is 8.6%, that is, the moisture content detected by the moisture content detecting point at 110 mm corresponds to the moisture content of 8.6% at 100mm of the standard thickness.
(3) And after the feeding is finished (the moisture sensor stops detecting), the upper control equipment performs mean value processing on the obtained corrected effective value of the moisture content, and the obtained value is used as a detection value of the moisture content of the sand aggregate which is put into transport in the current batch and is uploaded to a production system to be used as a basis for adjusting the concrete ratio.
According to the detection control method for the water content of the multi-aggregate sandstone, provided by the technical scheme provided by the embodiment of the invention, based on the real-time measured value of the water sensor, the height probe sensor is adopted to detect the thickness of aggregate material flow flowing through the belt conveying mechanism, so that the water content detection data is compensated and corrected, and the water content detection precision is improved. In addition, the data corresponding to the aggregate thickness smaller than or equal to the preset thickness threshold value are rejected by comparing the aggregate thickness with the preset thickness threshold value, so that the condition that the aggregate thickness is extremely thin or even no aggregate exists can be eliminated, the abnormal condition is avoided, and the corresponding influence caused by the fact that the moisture sensor cannot cope with the site abnormal working condition by controlling the starting and stopping mode of the moisture sensor only by means of the aggregate feeding time is avoided.
Accordingly, another aspect of the embodiments of the present invention provides an apparatus for detecting moisture content of aggregate.
Fig. 7 is a block diagram illustrating the structure of an apparatus for detecting the moisture content of aggregate according to another embodiment of the present invention. As shown in fig. 7, the device includes an aggregate thickness determination module 1, a moisture content detection module 4, a preset standard thickness moisture content determination module 2, and a moisture content determination module 3. The aggregate thickness determining module 1 is used for determining the aggregate thickness of the moisture content detecting point of the aggregate; the moisture content detection module 4 is used for detecting the moisture content of moisture content detection points, wherein the aggregate thickness corresponds to the moisture content one by one for any moisture content detection point; the preset standard thickness water content determining module 2 is used for determining the water content of the water content detection point corresponding to the preset standard thickness according to any water content detection point and based on the aggregate thickness, the preset standard thickness and the preset unit thickness water content error; the moisture content determining module 3 is used for determining the moisture content of the aggregate based on the determined moisture content corresponding to the preset standard thickness.
Through above-mentioned technical scheme, the moisture content that will detect is converted into the moisture content that corresponds to preset standard thickness, and the moisture content of aggregate is confirmed based on the moisture content that corresponds to preset standard thickness to make the moisture content that the aggregate moisture content of confirming used all correspond to preset standard thickness, realized confirming the moisture content of aggregate under the even condition of thickness, thereby improved moisture content detection precision.
Optionally, in this embodiment of the present invention, the preset standard thickness moisture content determining module is further configured to: and comparing the relationship between the aggregate thickness and a preset thickness threshold value before determining the moisture content of the moisture content detection point corresponding to the preset standard thickness based on the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error aiming at any moisture content detection point, wherein the condition that the moisture content of the moisture content detection point corresponding to the preset standard thickness is determined based on the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error is that the aggregate thickness is greater than the preset thickness threshold value.
Optionally, in the embodiment of the present invention, the error of the water content per unit thickness is determined based on the following: performing linear fitting on the aggregate thickness and the moisture content of the moisture content detection points to obtain a linear relation between the moisture content and the aggregate thickness; and determining the error of the water content of the preset unit thickness based on the slope in the linear relation.
Optionally, in the embodiment of the present invention, the linear fitting of the aggregate thickness and the moisture content at the moisture content detection point is a linear fitting based on a least square method.
The specific working principle and the benefits of the device for detecting the moisture content of the aggregate provided by the embodiment of the invention are similar to those of the method for detecting the moisture content of the aggregate provided by the embodiment of the invention, and are not repeated here.
In addition, another aspect of the embodiments of the present invention also provides a machine-readable storage medium, which stores instructions for causing a machine to execute the method described in the above embodiments.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. A method for detecting moisture content of aggregate, the method comprising:
determining the aggregate thickness of the aggregate moisture content detection point;
detecting the moisture content of the moisture content detection points, wherein the aggregate thickness corresponds to the moisture content one to one for any moisture content detection point;
determining the moisture content of the moisture content detection point corresponding to the preset standard thickness based on the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error aiming at any moisture content detection point; and
and determining the moisture content of the aggregate based on the determined moisture content corresponding to the preset standard thickness.
2. The method of claim 1, wherein for any moisture content detection point, before determining the moisture content corresponding to the predetermined standard thickness at the moisture content detection point based on the aggregate thickness, a predetermined standard thickness, and a predetermined unit thickness moisture content error, the method further comprises: comparing the relationship between the aggregate thickness and a preset thickness threshold value,
and determining the moisture content corresponding to the preset standard thickness on the basis of the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error under the condition that the aggregate thickness is greater than the preset thickness threshold value.
3. The method of claim 1 or 2, wherein the predetermined water cut per unit thickness error is determined based on:
performing linear fitting on the aggregate thickness and the moisture content of the moisture content detection point to obtain a linear relation between the moisture content and the aggregate thickness; and
and determining the error of the preset unit thickness water content based on the slope in the linear relation.
4. The method according to claim 3, wherein the linear fitting of the aggregate thickness and the moisture content at the moisture content detection points is a linear fitting based on a least square method.
5. An apparatus for detecting moisture content of aggregate, the apparatus comprising:
the aggregate thickness determining module is used for determining the aggregate thickness of the moisture content detecting point of the aggregate;
the moisture content detection module is used for detecting the moisture content of the moisture content detection points, wherein the aggregate thickness corresponds to the moisture content one to one for any moisture content detection point;
the preset standard thickness water content determining module is used for determining the water content of the water content detection point corresponding to the preset standard thickness according to any water content detection point and based on the aggregate thickness, the preset standard thickness and the preset unit thickness water content error; and
and the moisture content determining module is used for determining the moisture content of the aggregate based on the determined moisture content corresponding to the preset standard thickness.
6. The apparatus of claim 5, wherein the predetermined standard thickness moisture content determination module is further configured to: comparing the relation between the aggregate thickness and a preset thickness threshold value before determining the moisture content corresponding to the preset standard thickness by the moisture content detection point based on the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error aiming at any moisture content detection point,
and determining the moisture content corresponding to the preset standard thickness on the basis of the aggregate thickness, the preset standard thickness and the preset unit thickness moisture content error under the condition that the aggregate thickness is greater than the preset thickness threshold value.
7. The apparatus of claim 5 or 6, wherein the predetermined water cut per unit thickness error is determined based on:
performing linear fitting on the aggregate thickness and the moisture content of the moisture content detection point to obtain a linear relation between the moisture content and the aggregate thickness; and
and determining the error of the preset unit thickness water content based on the slope in the linear relation.
8. The apparatus according to claim 7, wherein the linear fitting of the aggregate thickness and the moisture content at the moisture content detection points is a linear fitting based on a least square method.
9. A machine-readable storage medium having stored thereon instructions for causing a machine to perform the method of any one of claims 1-4.
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