CN112903722A - Detection method and detection system for water content of sandstone aggregate and concrete production equipment - Google Patents
Detection method and detection system for water content of sandstone aggregate and concrete production equipment Download PDFInfo
- Publication number
- CN112903722A CN112903722A CN201911229937.5A CN201911229937A CN112903722A CN 112903722 A CN112903722 A CN 112903722A CN 201911229937 A CN201911229937 A CN 201911229937A CN 112903722 A CN112903722 A CN 112903722A
- Authority
- CN
- China
- Prior art keywords
- sandstone
- aggregates
- classified
- moisture content
- water content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 238000001514 detection method Methods 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000009826 distribution Methods 0.000 claims abstract description 85
- 239000004576 sand Substances 0.000 claims abstract description 73
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000012216 screening Methods 0.000 claims description 12
- 239000004575 stone Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 238000003860 storage Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
- G01N22/04—Investigating moisture content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Ceramic Engineering (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to the technical field of detection, and discloses a system and a method for detecting the water content of sandstone aggregate and concrete production equipment. The detection system comprises: the information acquisition device is used for acquiring the types and the distribution conditions of the classified and thrown sandstone aggregates in the preset area; the parameter receiving device is used for receiving characteristic parameters reflecting the water content of the classified and thrown sandstone aggregates; and the determining device is used for determining the average moisture content of the sand aggregates of all kinds and/or the average moisture content of the sand aggregates in the preset area based on the kinds of the sand aggregates put in the classification mode, the received characteristic parameters, the moisture model library and the distribution condition of the sand aggregates. The invention can realize the non-contact detection of the water content of the sandstone aggregate, improve the detection accuracy and measure the water content of various sandstone aggregates at one time.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a detection system and a detection method for the water content of sandstone aggregate and concrete production equipment.
Background
The concrete is a composite material formed by stirring cement, sandstone aggregate, water, admixture and additive according to a certain proportion. As one of the most widely applied materials in the field of building engineering, in order to ensure the production quality of concrete, the water consumption of the concrete needs to be accurately weighed according to the formula setting in the preparation process of the concrete. And the moisture content in the used grit aggregate of concrete receives environmental factor influence such as weather, place to change greatly, consequently in the production process of concrete, need detect out the moisture content of grit aggregate in advance to adjust and compensate water consumption and sand volume in the concrete production process.
At present, some concrete mixing plants adopt a mode of installing a contact type moisture sensor 8 to carry out online detection on the moisture content of aggregate. As shown in fig. 1, the contact moisture sensor 8 is mounted below the bin of sand aggregate. When the discharge gate 7 of the silo is opened and the gravel aggregate falls through the surface of the moisture sensor in a continuous and uniform state, the moisture sensor 8 detects the moisture content of the falling aggregate and transmits it to a production control system (not shown). However, in the above-described detection mode, abrasion of the moisture sensor 8 by the sand aggregate reduces the service life of the moisture sensor; meanwhile, the aggregate to be detected of the moisture sensor 8 needs to flow through the surface of the moisture sensor in a continuous and uniform state, and the quality problem (too many impurities and too high mud content) that the sandstone aggregate is easy to generate the phenomena of material sticking and uneven blanking when flowing through the surface of the moisture sensor can reduce the detection accuracy of the moisture sensor.
Disclosure of Invention
The invention aims to provide a detection system and a detection method for the water content of sandstone aggregate and concrete production equipment, which can realize non-contact detection of the sandstone aggregate on one hand so as to avoid abrasion to a detection instrument; on the other hand, the influence of the nonuniformity of the distribution of the sandstone aggregate on the detection of the water content can be effectively avoided, and the accuracy of the detection of the water content of the sandstone aggregate is effectively improved; in another aspect, the moisture content of various sand aggregates can be measured at one time.
In order to achieve the above object, an aspect of the present invention provides a system for detecting moisture content of a sandstone aggregate, the system comprising: the information acquisition device is used for acquiring the types and the distribution conditions of the classified and thrown sandstone aggregates in the preset area; the parameter receiving device is used for receiving characteristic parameters reflecting the water content of the classified and thrown sandstone aggregates; and the determining device is used for determining the average water content of the sand aggregates of all the types and/or the average water content of the sand aggregates in the preset area based on the types of the sand aggregates put in the classification mode, the received characteristic parameters, the moisture model library and the distribution condition of the sand aggregates, wherein the moisture model library is configured and stored with: and the standard relation between the water content of each type of sandstone aggregate sample and characteristic parameters reflecting the water content of the type of sandstone aggregate.
Preferably, the determining means comprises: the first determination module is used for determining the moisture content of the classified and thrown sandstone aggregates based on the types of the classified and thrown sandstone aggregates, the received characteristic parameters and the moisture model library; and the second determination module is used for determining the average water content of the various types of sandstone aggregates and/or the average water content of the sandstone aggregates in the preset area based on the water content of the classified input sandstone aggregates and the distribution condition of the sandstone aggregates.
Preferably, the second determining module includes: the screening unit is used for screening the classified and thrown sandstone aggregates meeting the qualified distribution conditions according to the distribution condition of the sandstone aggregates; and the average moisture content determining unit is used for determining the average moisture content of the various types of sandstone aggregates and/or the average moisture content of the sandstone aggregates in the preset area according to the moisture content of the classified input sandstone aggregates meeting the qualified distribution conditions.
Preferably, the average moisture content determining unit includes: the moisture content determiner is used for determining the moisture content of each type of sandstone aggregate according to the moisture content of the classified put-in sandstone aggregates meeting the qualified distribution conditions; and the first average moisture content determiner is used for determining the average moisture content of the various types of sandstone aggregates according to the moisture content of the various types of sandstone aggregates.
Preferably, the average moisture content determining unit includes: and the second average water content determiner is used for determining the average water content of the sandstone aggregates in the preset area according to the water content of the classified input sandstone aggregates meeting the qualified distribution.
Preferably, the information acquisition apparatus includes: the image receiving module is used for receiving the images of the classified and thrown sandstone aggregates in the preset area; and the third determining module is used for determining the type and the distribution condition of the classified and thrown sandstone aggregates according to the images of the classified and thrown sandstone aggregates in the preset area.
Preferably, the third determining module is configured to determine the type of the classified sand aggregate in the preset area, and includes: and performing characteristic matching according to the chromaticity, the saturation and the gray level of the image of the classified and thrown sandstone aggregate so as to determine the type of the classified and thrown sandstone aggregate.
Preferably, the detection system further comprises: and the parameter acquisition device is used for acquiring characteristic parameters of the classified input sandstone aggregates reflecting the moisture content of the classified input sandstone aggregates and sending the characteristic parameters to the parameter receiving device.
Preferably, the parameter acquisition device is a moisture content microwave sensor, and this moisture content microwave sensor cooperates the grit aggregate of categorised input is directly over setting up, correspondingly, moisture content microwave sensor is used for to the grit aggregate transmission microwave of categorised input to gather the process the decay parameter of grit aggregate reflection of categorised input.
Through the technical scheme, the method creatively determines the average water content of the various types of sandstone aggregates and/or the average water content of the sandstone aggregates in the preset area according to the characteristic parameters reflecting the water content of the classified thrown sandstone aggregates, the types of the classified thrown sandstone aggregates, the received characteristic parameters, the water model library and the distribution condition of the sandstone aggregates, so that on one hand, the method can realize non-contact detection of the sandstone aggregates, and further avoid the abrasion of a detection instrument; on the other hand, the influence of the nonuniformity of the distribution of the sandstone aggregate on the detection of the water content can be effectively avoided, and the accuracy of the detection of the water content of the sandstone aggregate is effectively improved; in another aspect, the moisture content of various sand aggregates can be measured at one time.
The invention also provides a method for detecting the water content of the sandstone aggregate, which comprises the following steps: acquiring the types and the distribution conditions of the classified gravel aggregates in the preset area; receiving characteristic parameters reflecting the water content of the classified and thrown sandstone aggregates; and determining the average water content of the sand aggregates of all the types and/or the average water content of the sand aggregates in the preset area based on the types of the sand aggregates put in the classification mode, the received characteristic parameters, a water model library and the distribution condition of the sand aggregates, wherein the water model library is configured and stored with: and the standard relation between the water content of each type of sandstone aggregate sample and characteristic parameters reflecting the water content of the type of sandstone aggregate.
For details and benefits of the method for detecting the water content of the sandstone aggregate provided by the invention, reference can be made to the description of the detection system for the water content of the sandstone aggregate, and details are not repeated herein.
The invention also provides concrete production equipment which comprises the detection system for the water content of the sandstone aggregate.
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 prior art contact moisture sensor;
FIG. 2 is a structural diagram of a detection system for moisture content of sand aggregate according to an embodiment of the present invention;
fig. 3 is a block diagram of a determination apparatus provided in an embodiment of the present invention;
fig. 4 is a block diagram of an information acquisition apparatus according to an embodiment of the present invention;
FIG. 5 is a structural diagram of a system for detecting moisture content of sand and stone aggregates according to an embodiment of the present invention;
fig. 6 is a block diagram of a second determination device provided in an embodiment of the present invention;
FIG. 7 is a block diagram of an average moisture content determining unit according to an embodiment of the present invention;
FIG. 8 is a block diagram of an average moisture content determining unit according to an embodiment of the present invention;
FIG. 9 is a structural diagram of a system for detecting moisture content of sand and stone aggregates according to an embodiment of the present invention; and
fig. 10 is a flowchart of a method for detecting the water content of the sand aggregate according to an embodiment of the present invention.
Description of the reference numerals
1 control of the apparatus 2 conveyor
3 stock bin 4 industrial camera
5 sub-area 6 moisture content microwave sensor
7-discharge door 8-moisture sensor
10 information acquisition device 20 parameter receiving device
30 determining means 40 first determining module
50 second determination module 60 parameter acquisition device
70 image acquisition device 100 image acquisition device
110 third determination device 500 screening unit
510 average moisture percentage determination unit 520 moisture percentage determiner
530 first average moisture content determiner 540 second average moisture content determiner
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.
Fig. 2 is a structural diagram of a detection system for moisture content of sand aggregate according to an embodiment of the present invention. As shown in fig. 2, the detection system may include: the information acquisition device 10 is used for acquiring the types and distribution conditions of the classified and thrown gravel aggregates in a preset area; the parameter receiving device 20 is used for receiving characteristic parameters reflecting the water content of the classified and thrown sandstone aggregates; a determining device 30, configured to determine the average moisture content of the gravel aggregates of each type and/or the average moisture content of the gravel aggregates in the preset area based on the type of the gravel aggregates put in the classification, the received characteristic parameter, a moisture model library, and the distribution of the gravel aggregates, where the moisture model library is configured and stored with: and the standard relation between the water content of each type of sandstone aggregate sample and characteristic parameters reflecting the water content of the type of sandstone aggregate. The characteristic parameters reflecting the moisture content of the classified and thrown sandstone aggregate can be collected by a parameter collecting device 60 (for example, the moisture content microwave sensor 6 shown in fig. 9) shown in fig. 5, and the specific collecting process will be described in detail below.
Wherein, the determining device 30 may include: the first determining module 40 is configured to determine the moisture content of the classified thrown sandstone aggregates based on the types of the classified thrown sandstone aggregates, the received characteristic parameters and the moisture model library; and a second determining module 50, configured to determine, based on the moisture content of the classified and dropped sandstone aggregates and the distribution condition of the sandstone aggregates, the average moisture content of each kind of sandstone aggregates and/or the average moisture content of the sandstone aggregates in the preset area, as shown in fig. 3.
The information acquiring device 10, the parameter receiving device 20, and the determining device 30 may be integrated in the control apparatus 1 (as shown in fig. 9). Taking fig. 9 as an example, in a preset time period, the sandstone aggregates in the multiple bins 3 are simultaneously thrown onto the conveyor belt 2 in constant speed operation to form a region (which may be simply referred to as a sub-region) where the sandstone aggregates thrown in multiple categories are located, wherein the types of the sandstone aggregates in the multiple bins 3 may be the same or different.
The control device 1 may be, among other things, a general purpose processor, a special purpose processor, a conventional processor, a Digital Signal Processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of Integrated Circuit (IC), a state machine, or the like.
As shown in fig. 4, the information acquisition apparatus 10 may include: the image receiving module 100 is configured to receive the images of the classified placed gravel aggregates in the preset region, and the third determining module 110 is configured to determine the type and distribution of the classified placed gravel aggregates according to the images of the classified placed gravel aggregates in the preset region.
Accordingly, as shown in fig. 5, the detection system may further include: and the image acquisition device 70 is used for acquiring the images of the classified and thrown sandstone aggregates in the preset area and sending the images to the information acquisition device 10. Wherein the image capturing device 70 may be an industrial camera 4 (as shown in fig. 9). The industrial camera 4 is arranged above the conveyor belt 2 and the field of view taken by the industrial camera 4 may comprise at least a sub-area 5 of the conveyor belt 2 directly opposite the moisture content microwave sensor 6, as shown in fig. 9. When the sandstone aggregate is conveyed into the sub-region 5, the industrial camera 4 shoots the sandstone aggregate in the sub-region 5 and sends the shot image to the control device 1, meanwhile, the moisture content microwave sensor 6 transmits a specific energy signal to the sandstone aggregate in the sub-region 5, collects an energy signal attenuation value reflected by the sandstone aggregate (the specific energy signal is partially absorbed by the sandstone aggregate, so that the energy signal is attenuated), and sends the collected energy signal attenuation value to the control device 1, and the specific content will be explained below.
Different types of sand aggregate can present different characteristics (such as chroma, saturation and gray level) on the image, so that the image characteristics of different types of sand aggregate can be collected in advance to establish an image characteristic library which can be used for identifying the sand aggregate, and then the different characteristics in the collected image of the sand aggregate to be detected are matched with the image characteristics in the image characteristic library to identify whether the sand aggregate to be detected exists and the type of the sand aggregate to be detected.
The third determining module 110 may be configured to determine the type of the classified sand aggregate in the preset region, which may include: and performing characteristic matching according to the chromaticity, the saturation and the gray level of the image of the classified and thrown sandstone aggregate so as to determine the type of the classified and thrown sandstone aggregate.
Specifically, after receiving an image of sand aggregate in a certain sub-area, determining whether sand aggregate is present in the sub-area; under the condition that the sand aggregate is determined to exist, extracting the characteristics of the image such as the chroma, the saturation, the gray level and the like, matching the extracted characteristics with the image characteristics of different types of sand aggregates in a known image characteristic library, and determining the type of the sand aggregate in the sub-area to be type A when the extracted characteristics are matched with the corresponding characteristics of the image of the sand aggregate of type A.
The third determining module 110 may be configured to determine the distribution of the classified and dropped sand aggregates in the preset region, where the distribution of the classified and dropped sand aggregates in the preset region may include: and determining the distribution uniformity of the classified and thrown sandstone aggregates according to the images of the classified and thrown sandstone aggregates. Specifically, according to the image of the classified and thrown sandstone aggregate, the proportion of the width of the sandstone aggregate in the width of each sub-region can be determined, namely the width distribution proportion of the sandstone aggregate thrown in the sand classification.
As shown in fig. 5, the detection system may further include: and the parameter acquisition device 60 is used for acquiring characteristic parameters of classified input and reflecting the water content of the classified input sandstone aggregate and sending the characteristic parameters to the parameter receiving device 20. Wherein, the parameter collecting device 60 can be a moisture content microwave sensor 6 (as shown in fig. 9) or an infrared sensor. The working principle of the parameter acquisition device 60 is as follows: the water content detection of the material is realized by utilizing the linear correlation between the absorption rate (corresponding to the attenuation value) of the material to be detected on the transmitted energy signal and the water content of the material to be detected. Specifically, the parameter collecting device 60 transmits a specific energy signal (which may be microwave or infrared) to the material to be measured and receives an echo, and when the material to be measured passes through the detection range of the parameter collecting device 60 in a uniform and continuous state, a corresponding linear relationship exists between the attenuation value of the energy signal detected by the parameter collecting device 60 and the water content of the material. For different types of sandstone aggregates, the corresponding relationship between the measured value of the reflection parameter acquisition device 60 and the moisture content of the sandstone aggregates is different.
Correspondingly, the standard relation (namely the moisture model) between the moisture content of each type of sand aggregate sample in the moisture model library and the attenuation parameter of the detection signal after being absorbed by the sand aggregate can be established in the following way: recording the moisture content of a certain type of sandstone aggregate sample obtained by drying and weighing in a laboratory and the attenuation value of an energy signal acquired by a parameter acquisition device 60 (preferably a moisture content microwave sensor 6); performing linear fitting on the obtained water content measured value and the acquisition reading of the parameter acquisition device 60 to obtain a linear equation, namely the water model corresponding to the sandstone aggregate sample; and respectively establishing moisture models corresponding to different types of sandstone aggregate samples. The moisture model may be stored in a moisture model library, which may be configured in the control device 1 or the parameter acquisition means 60, and the control device 1 may switch and call the moisture model as needed.
The infrared sensor has the following two disadvantages: the method is sensitive to radiation with a specific wavelength, namely, the moisture content of the sandstone aggregate with a single color can be accurately measured (actually, the sandstone aggregate has more colors); the penetrability is poor, can only measure the moisture on surface, so the accuracy of measuring the moisture content through infrared sensor is relatively poor. Compared with an infrared sensor, the moisture content microwave sensor 6 adopted by the invention does not have the defects, so that the moisture content of the sandstone aggregate can be measured with high precision, therefore, in the preferred embodiment of the invention, the moisture content microwave sensor 6 is adopted as the parameter acquisition device 60, and the moisture content microwave sensor 6 is arranged right above each subarea. Therefore, non-contact detection of the sandstone aggregate can be realized, so that abrasion to the moisture content microwave sensor 6 is avoided, the service life of the moisture content microwave sensor 6 is prolonged, and the updating cost of a detection instrument is saved.
After determining the type of the sandstone aggregate in a certain specific sub-region, the control device 1 calls a moisture model corresponding to the determined type according to the type of the sandstone aggregate to perform online detection on the moisture content of the sandstone aggregate. Specifically, the control device 1 may determine the moisture content of the sand-like aggregate in the specific sub-region according to the attenuation value of the collected detection signal after being reflected by the sand-like aggregate and the called moisture model (i.e., the standard relationship between the moisture content of the sand-like aggregate sample and the attenuation value). Then, similar steps are carried out on the sandstone aggregates in other sub-areas, and the corresponding relation between the type and the water content of the sandstone aggregates in each sub-area can be obtained. Then, the control device 1 analyzes and processes the water content data of the sandstone aggregates of different types or in each sub-area: invalid data with unqualified distribution (which will be described later) are filtered out, then the average value of the valid data with qualified distribution is calculated to obtain the integral water content value of the sandstone aggregate in the same type or the same sub-area, and the batching production is automatically adjusted according to the result.
Specifically, when the sandstone aggregate is delivered on the conveyor belt 2 (as shown in fig. 9), due to the fact that various production factors can influence the distribution phenomenon that the sandstone aggregate is discontinuous and uneven in thickness, the final moisture content detection precision is low, therefore, a screening unit can be arranged in the second determination module, the screening unit can be adopted to screen the sandstone aggregate which is delivered in a classified mode and meets the qualified distribution conditions, and then the moisture content is determined only by using the measurement result of the sandstone aggregate which meets the qualified distribution conditions. The qualified distribution condition can be that the uniformity of the classified and thrown sandstone aggregates is greater than or equal to a preset uniformity.
As shown in fig. 6, the second determining module 50 may include: the screening unit 500 is used for screening the classified gravel aggregates which meet the qualified distribution conditions according to the distribution conditions of the gravel aggregates; and an average moisture content determining unit 510, configured to determine, according to the moisture content of the classified put-in sandstone aggregates meeting the qualified distribution condition, an average moisture content of the sandstone aggregates of each kind and/or an average moisture content of the sandstone aggregates in the preset area.
For the screening unit 500, the sandstone aggregates meeting the qualified distribution condition and the sandstone aggregates not meeting the qualified distribution condition are distinguished according to the distribution width ratio of the sandstone aggregates in each sub-area on the conveyor belt 2, and the sandstone aggregates which are distributed in a qualified way are screened. For example, when the distribution width ratio of the sand aggregate in a certain sub-area on the conveyor belt 2 is greater than or equal to the preset distribution width ratio, determining the sand aggregate in the sub-area as the sand aggregate meeting the qualified distribution condition; and when the width distribution ratio of the sandstone aggregate in a certain sub-area on the conveyor belt 2 is smaller than the preset width distribution ratio, determining the sandstone aggregate in the sub-area as the sandstone aggregate which does not meet the qualified distribution condition. Therefore, the water content can be determined only by using the measurement result of the sand aggregate which is qualified in distribution. Therefore, the influence of the distribution nonuniformity of the sandstone aggregate on the water content detection can be effectively avoided, and the accuracy of the water content detection of the sandstone aggregate is effectively improved.
Three examples will be described below to describe the procedure of determining the average water content of each type of aggregate, the average water content of aggregate in a predetermined area, and the average water contents of the aggregate in the first and second areas, respectively.
In one embodiment, in order to determine the average moisture content of each type of sandstone aggregate, sandstone aggregates meeting the qualified distribution condition may be screened first; then, determining the moisture content of various types of sandstone aggregates meeting the qualified distribution conditions; and finally, determining the average water content of the sandstone aggregates of various types meeting the qualified distribution conditions. Specifically, as shown in fig. 7, the average water cut determining unit 510 may include: a moisture content determiner 520, configured to determine moisture contents of the various types of sandstone aggregates according to the moisture contents of the classified put-in sandstone aggregates meeting the qualified distribution conditions; and a first average moisture content determiner 530 for determining an average moisture content of the respective kinds of the gravel aggregates according to the moisture content of the respective kinds of the gravel aggregates. Therefore, the embodiment of the invention can realize the one-time measurement of the water content of various sandstone aggregates.
In another embodiment, in order to determine the average moisture content of the sand aggregates in the preset area, the classified thrown sand aggregates meeting the qualified distribution condition may be first screened, so that the classified thrown sand aggregates not meeting the qualified distribution condition (i.e., the classified thrown sand aggregates with the uniformity smaller than the preset uniformity) may be rejected; and then determining the average water content of the sand aggregate which is distributed in the preset area and is qualified. The average moisture content determining unit 510 may include: and a second average moisture content determiner 540 (shown in fig. 8) configured to determine an average moisture content of the sand aggregate in the preset area according to the moisture content of the classified sand aggregate that meets the qualified distribution.
In yet another embodiment, in order to determine the average moisture content of various kinds of sand aggregates and the average moisture content of sand aggregates within a preset area, the average moisture content determination unit 510 may include: the moisture content determiner 520, the first average moisture content determiner 530, and the second average moisture content determiner 540 are shown in FIG. 8. Of course, the first average moisture content determiner 530 and the second average moisture content determiner 540 may also be the same module.
The detection process will now be explained and explained by taking as an example the detection system including the control apparatus 1, the industrial camera 4, and the moisture content microwave sensor 6 shown in fig. 9.
First, the industrial camera 4 collects images of the sand aggregates in the sub-area 5 on the conveyor belt 2 below the moisture content microwave sensor 6 and sends the collected images to the control device 1. Meanwhile, the moisture content microwave sensor 6 collects a signal attenuation value of a detection signal passing through the sandstone aggregate in the sub-region 5, and sends the signal attenuation value to the control equipment 1.
Secondly, the control device 1 performs analysis processing on the acquired images to judge the type and distribution uniformity of the sand aggregate in the sub-region 5.
Then, the control device 1 calls a corresponding moisture model in a moisture model library arranged in the control device according to the type of the sandstone aggregate judged by the image processing; and determining the water content of the sandstone aggregate in the sub-region 5 according to the called water model and the received signal attenuation value, thereby realizing online detection. Of course, the control device 1 may also control the moisture content microwave sensor 6 to call a corresponding moisture model in a moisture model library configured inside the moisture content microwave sensor 6 according to the type of the sandstone aggregate determined by the image processing; and the moisture content microwave sensor 6 determines the moisture content of the sandstone aggregate in the sub-region 5 according to the acquired signal attenuation value and the corresponding moisture model.
Then, the control device 1 screens the qualified sandstone aggregate distributed in each sub-area according to the determined uniformity of the sandstone aggregate distribution.
And in the conveying process of the conveyor belt, executing the steps at time intervals corresponding to the sub-regions so as to obtain the corresponding relation between the types and the water content of the sandstone aggregates in the sub-regions and screen out the sandstone aggregates which are qualified in distribution in the sub-regions.
Finally, the control equipment 1 determines the average moisture content of the sandstone aggregates in the whole preset area according to the moisture content of the sandstone aggregates which are distributed in each sub-area and qualified. Or the control equipment 1 determines the average water content of the various types of sandstone aggregates according to the water content of the various types of sandstone aggregates which are distributed qualified.
In summary, the present invention creatively determines the average moisture content of the various types of gravel aggregates and/or the average moisture content of the gravel aggregates in the preset area according to the characteristic parameters reflecting the moisture content of the classified thrown gravel aggregates, the types of the classified thrown gravel aggregates, the received characteristic parameters, the moisture model library and the distribution condition of the gravel aggregates, so that on one hand, the present invention can realize the non-contact detection of the gravel aggregates, thereby avoiding the abrasion of the detection instrument; on the other hand, the influence of the nonuniformity of the distribution of the sandstone aggregate on the detection of the water content can be effectively avoided, and the accuracy of the detection of the water content of the sandstone aggregate is effectively improved; in another aspect, the moisture content of various sand aggregates can be measured at one time.
Fig. 10 is a flowchart of a method for detecting the water content of the sand aggregate according to an embodiment of the present invention. As shown in fig. 10, the detection method may include the steps of: step S1001, acquiring the types and distribution conditions of classified and thrown sandstone aggregates in a preset area; step S1002, receiving characteristic parameters reflecting the water content of the classified and thrown sandstone aggregates; step S1003, determining the average moisture content of the gravel aggregates of each kind and/or the average moisture content of the gravel aggregates in the preset area based on the types of the gravel aggregates put in by classification, the received characteristic parameters, a moisture model library and the distribution condition of the gravel aggregates, wherein the moisture model library is configured and stored with: and the standard relation between the water content of each type of sandstone aggregate sample and characteristic parameters reflecting the water content of the type of sandstone aggregate.
Preferably, the determining the average moisture content of the various types of sand aggregates and/or the average moisture content of the sand aggregates in the preset area comprises: determining the moisture content of the classified thrown sandstone aggregate based on the type of the classified thrown sandstone aggregate, the received characteristic parameters and the moisture model library; and determining the average moisture content of the various types of sandstone aggregates and/or the average moisture content of the sandstone aggregates in the preset area based on the moisture content of the classified put sandstone aggregates and the distribution condition of the sandstone aggregates.
Preferably, the determining the average moisture content of the various types of sand aggregates and/or the average moisture content of the sand aggregates in the preset area comprises: screening classified placed sandstone aggregates meeting qualified distribution conditions according to the distribution condition of the sandstone aggregates; and determining the average water content of the various types of sandstone aggregates and/or the average water content of the sandstone aggregates in the preset area according to the water content of the classified put-in sandstone aggregates meeting the qualified distribution conditions. .
Preferably, the determining the average moisture content of the respective kinds of sand aggregates comprises: determining the water content of the various types of sandstone aggregates according to the water content of the classified put-in sandstone aggregates meeting the qualified distribution conditions; and determining the average water content of the various types of sandstone aggregates according to the water content of the various types of sandstone aggregates.
Preferably, the determining the average moisture content of the sandstone aggregates in the preset area comprises: and determining the average water content of the sandstone aggregates in the preset area according to the water content of the classified input sandstone aggregates meeting the qualified distribution conditions.
Preferably, the acquiring the types and distribution conditions of the classified and thrown sandstone aggregates in the preset area comprises: receiving images of classified and thrown gravel aggregates in the preset area; and determining the type and distribution condition of the classified and thrown sandstone aggregates in the preset area according to the image of the classified and thrown sandstone aggregates in the preset area.
Preferably, the determining the type of the classified sand and stone aggregates thrown in the preset area comprises: carrying out characteristic matching according to the chromaticity, the saturation and the gray level of the image of the classified thrown sandstone aggregate so as to determine the type of the classified thrown sandstone aggregate
For details and benefits of the method for detecting the water content of the sandstone aggregate provided by the invention, reference can be made to the description of the detection system for the water content of the sandstone aggregate, and details are not repeated herein.
Correspondingly, the embodiment of the invention also provides concrete production equipment, and the concrete production equipment comprises the detection system for the water content of the sandstone aggregate.
The invention also provides a machine-readable storage medium, wherein the machine-readable storage medium is stored with instructions for causing a machine to execute the method for detecting the water content of the sandstone aggregate.
The machine-readable storage medium includes, but is not limited to, Phase Change Random Access Memory (PRAM, also known as RCM/PCRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Flash Memory (Flash Memory) or other Memory technology, compact disc read only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, and various media capable of storing program code.
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 (17)
1. The utility model provides a detecting system of grit aggregate moisture content which characterized in that, detecting system includes:
the information acquisition device is used for acquiring the types and the distribution conditions of the classified and thrown sandstone aggregates in the preset area;
the parameter receiving device is used for receiving characteristic parameters reflecting the water content of the classified and thrown sandstone aggregates; and
a determining device, configured to determine the average moisture content of the sand aggregates of each type and/or the average moisture content of the sand aggregates in the preset area based on the types of the sand aggregates that are placed in the classification manner, the received characteristic parameters, the moisture model library, and the distribution condition of the sand aggregates,
wherein the moisture model library is configured to store: and the standard relation between the water content of each type of sandstone aggregate sample and characteristic parameters reflecting the water content of the type of sandstone aggregate.
2. The sand aggregate moisture content detection system as claimed in claim 1, wherein the determination means comprises:
the first determination module is used for determining the moisture content of the classified and thrown sandstone aggregates based on the types of the classified and thrown sandstone aggregates, the received characteristic parameters and the moisture model library; and
and the second determination module is used for determining the average water content of the various types of sandstone aggregates and/or the average water content of the sandstone aggregates in the preset area based on the water content of the classified input sandstone aggregates and the distribution condition of the sandstone aggregates.
3. The sand aggregate moisture content detection system of claim 2, wherein the second determination module comprises:
the screening unit is used for screening the classified and thrown sandstone aggregates meeting the qualified distribution conditions according to the distribution condition of the sandstone aggregates; and
and the average water content determining unit is used for determining the average water content of the various types of sandstone aggregates and/or the average water content of the sandstone aggregates in the preset area according to the water content of the classified input sandstone aggregates meeting the qualified distribution conditions.
4. The sand aggregate moisture content detection system according to claim 3, wherein the average moisture content determination unit includes:
the moisture content determiner is used for determining the moisture content of each type of sandstone aggregate according to the moisture content of the classified put-in sandstone aggregates meeting the qualified distribution conditions; and
and the first average moisture content determiner is used for determining the average moisture content of the various types of sandstone aggregates according to the moisture content of the various types of sandstone aggregates.
5. The sand aggregate moisture content detection system according to claim 3, wherein the average moisture content determination unit includes:
and the second average water content determiner is used for determining the average water content of the sandstone aggregates in the preset area according to the water content of the classified input sandstone aggregates meeting the qualified distribution.
6. The sandstone aggregate moisture content detection system of claim 1, wherein the information acquisition device comprises:
the image receiving module is used for receiving the images of the classified and thrown sandstone aggregates in the preset area; and
and the third determining module is used for determining the type and the distribution condition of the classified and thrown sandstone aggregates according to the images of the classified and thrown sandstone aggregates in the preset area.
7. The detection system for aggregate moisture content of sandstone of claim 6, wherein the third determination module is configured to determine the type of sandstone aggregate that is put in classification in the preset area, and the determination module is configured to:
and performing characteristic matching according to the chromaticity, the saturation and the gray level of the image of the classified and thrown sandstone aggregate so as to determine the type of the classified and thrown sandstone aggregate.
8. The sandstone aggregate moisture content detection system of claim 1, wherein the detection system further comprises:
and the parameter acquisition device is used for acquiring characteristic parameters of the classified input sandstone aggregates reflecting the moisture content of the classified input sandstone aggregates and sending the characteristic parameters to the parameter receiving device.
9. The sandstone aggregate moisture content detection system of claim 8, wherein the parameter acquisition device is a moisture content microwave sensor which is arranged right above the classified and thrown sandstone aggregate,
correspondingly, the moisture content microwave sensor is used for emitting microwaves to the classified and thrown sandstone aggregates and collecting attenuation parameters reflected by the classified and thrown sandstone aggregates.
10. A detection method for the water content of sandstone aggregates is characterized by comprising the following steps:
acquiring the types and the distribution conditions of the classified gravel aggregates in the preset area;
receiving characteristic parameters reflecting the water content of the classified and thrown sandstone aggregates; and
determining the average water content of the sandstone aggregates of various types and/or the average water content of the sandstone aggregates in the preset area based on the types of the sandstone aggregates which are put in a classified mode, the received characteristic parameters, the water model library and the distribution condition of the sandstone aggregates,
wherein the moisture model library is configured to store: and the standard relation between the water content of each type of sandstone aggregate sample and characteristic parameters reflecting the water content of the type of sandstone aggregate.
11. The method for detecting the moisture content of the sandstone aggregate according to claim 10, wherein the determining the average moisture content of the sandstone aggregates of each kind and/or the average moisture content of the sandstone aggregates in the preset area comprises:
determining the moisture content of the classified thrown sandstone aggregate based on the type of the classified thrown sandstone aggregate, the received characteristic parameters and the moisture model library; and
and determining the average water content of the various types of sandstone aggregates and/or the average water content of the sandstone aggregates in the preset area based on the water content of the classified put sandstone aggregates and the distribution condition of the sandstone aggregates.
12. The method for detecting the moisture content of the sandstone aggregate according to claim 11, wherein the determining the average moisture content of the sandstone aggregates of each kind and/or the average moisture content of the sandstone aggregates in the preset area comprises:
screening classified placed sandstone aggregates meeting qualified distribution conditions according to the distribution condition of the sandstone aggregates; and
and determining the average water content of the various types of sandstone aggregates and/or the average water content of the sandstone aggregates in the preset area according to the water content of the classified put-in sandstone aggregates meeting the qualified distribution conditions.
13. The method for detecting the moisture content of the sandstone aggregate according to claim 12, wherein the determining the average moisture content of each type of sandstone aggregate comprises:
determining the water content of the various types of sandstone aggregates according to the water content of the classified put-in sandstone aggregates meeting the qualified distribution conditions; and
and determining the average water content of the various types of sandstone aggregates according to the water content of the various types of sandstone aggregates.
14. The method for detecting the moisture content of the sandstone aggregate according to claim 12, wherein the step of determining the average moisture content of the sandstone aggregate in the preset area comprises the following steps:
and determining the average water content of the sandstone aggregates in the preset area according to the water content of the classified input sandstone aggregates meeting the qualified distribution conditions.
15. The method for detecting the water content of the sandstone aggregates according to claim 10, wherein the step of acquiring the types and the distribution of the sandstone aggregates which are put in a preset area in a classified mode comprises the following steps:
receiving images of classified and thrown gravel aggregates in the preset area; and
and determining the type and distribution condition of the classified and thrown sandstone aggregates in the preset area according to the image of the classified and thrown sandstone aggregates in the preset area.
16. The method for detecting the moisture content of the sandstone aggregates according to claim 15, wherein the determining the types of the sandstone aggregates which are put in the preset area in a classified mode comprises:
and performing characteristic matching according to the chromaticity, the saturation and the gray level of the image of the classified and thrown sandstone aggregate so as to determine the type of the classified and thrown sandstone aggregate.
17. A concrete production facility, characterised in that it comprises a detection system for the moisture content of sand and stone aggregates according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911229937.5A CN112903722B (en) | 2019-12-04 | 2019-12-04 | Detection method and detection system for water content of sandstone aggregate and concrete production equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911229937.5A CN112903722B (en) | 2019-12-04 | 2019-12-04 | Detection method and detection system for water content of sandstone aggregate and concrete production equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112903722A true CN112903722A (en) | 2021-06-04 |
| CN112903722B CN112903722B (en) | 2022-11-01 |
Family
ID=76111196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911229937.5A Active CN112903722B (en) | 2019-12-04 | 2019-12-04 | Detection method and detection system for water content of sandstone aggregate and concrete production equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112903722B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113776982A (en) * | 2021-09-22 | 2021-12-10 | 山东大学 | Stone water content detection method and device based on machine vision |
| CN114253304A (en) * | 2022-01-11 | 2022-03-29 | 三一重型装备有限公司 | Control method, device and system for water content of machine-made sand and sand making equipment |
| CN115366265A (en) * | 2022-08-31 | 2022-11-22 | 常德市三一机械有限公司 | Self-adaptive water control method, device and system for mixing plant and mixing plant |
| CN117761113A (en) * | 2023-12-22 | 2024-03-26 | 四川蜀道建筑科技有限公司 | Online monitoring device and method for water content of sand |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521066A (en) * | 2016-12-23 | 2017-03-22 | 天津市三特电子有限公司 | Blast furnace burden particle size monitoring system and distributed data on-line analysis method |
| CN107064179A (en) * | 2017-06-23 | 2017-08-18 | 福建南方路面机械有限公司 | A kind of sand material moisture content online automatic detection instrument |
| CN108169250A (en) * | 2018-03-01 | 2018-06-15 | 青岛恒拓环保科技有限公司 | A kind of intelligent frequency-conversion microwave measurement for moisture content instrument and measuring method |
| CN109187588A (en) * | 2018-09-12 | 2019-01-11 | 中联重科股份有限公司 | Water content of sandstone measurement method and device, concrete generate system and mixing plant |
| CN109399984A (en) * | 2018-11-13 | 2019-03-01 | 中国铁建重工集团有限公司 | The control method and device of water content of sandstone |
| CN110044977A (en) * | 2019-05-07 | 2019-07-23 | 中山市武汉理工大学先进工程技术研究院 | A kind of sandstone aggregate detecting device for moisture content and method |
| CN209460137U (en) * | 2019-01-24 | 2019-10-01 | 西安天盛混凝土有限公司 | Water content ratio of aggregate automated watch-keeping facility |
| CN110567990A (en) * | 2019-09-25 | 2019-12-13 | 北京建筑材料科学研究总院有限公司 | Concrete fine aggregate moisture content on-line measuring device and concrete production system |
-
2019
- 2019-12-04 CN CN201911229937.5A patent/CN112903722B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521066A (en) * | 2016-12-23 | 2017-03-22 | 天津市三特电子有限公司 | Blast furnace burden particle size monitoring system and distributed data on-line analysis method |
| CN107064179A (en) * | 2017-06-23 | 2017-08-18 | 福建南方路面机械有限公司 | A kind of sand material moisture content online automatic detection instrument |
| CN108169250A (en) * | 2018-03-01 | 2018-06-15 | 青岛恒拓环保科技有限公司 | A kind of intelligent frequency-conversion microwave measurement for moisture content instrument and measuring method |
| CN109187588A (en) * | 2018-09-12 | 2019-01-11 | 中联重科股份有限公司 | Water content of sandstone measurement method and device, concrete generate system and mixing plant |
| CN109399984A (en) * | 2018-11-13 | 2019-03-01 | 中国铁建重工集团有限公司 | The control method and device of water content of sandstone |
| CN209460137U (en) * | 2019-01-24 | 2019-10-01 | 西安天盛混凝土有限公司 | Water content ratio of aggregate automated watch-keeping facility |
| CN110044977A (en) * | 2019-05-07 | 2019-07-23 | 中山市武汉理工大学先进工程技术研究院 | A kind of sandstone aggregate detecting device for moisture content and method |
| CN110567990A (en) * | 2019-09-25 | 2019-12-13 | 北京建筑材料科学研究总院有限公司 | Concrete fine aggregate moisture content on-line measuring device and concrete production system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113776982A (en) * | 2021-09-22 | 2021-12-10 | 山东大学 | Stone water content detection method and device based on machine vision |
| CN114253304A (en) * | 2022-01-11 | 2022-03-29 | 三一重型装备有限公司 | Control method, device and system for water content of machine-made sand and sand making equipment |
| CN115366265A (en) * | 2022-08-31 | 2022-11-22 | 常德市三一机械有限公司 | Self-adaptive water control method, device and system for mixing plant and mixing plant |
| CN115366265B (en) * | 2022-08-31 | 2024-01-16 | 常德市三一机械有限公司 | Self-adaptive water control method, device and system for mixing plant and mixing plant |
| CN117761113A (en) * | 2023-12-22 | 2024-03-26 | 四川蜀道建筑科技有限公司 | Online monitoring device and method for water content of sand |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112903722B (en) | 2022-11-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112903722B (en) | Detection method and detection system for water content of sandstone aggregate and concrete production equipment | |
| CN110118775B (en) | Method for rapidly detecting composition of plant-mixed cement stabilized macadam aggregate | |
| KR102519203B1 (en) | gray water measurement | |
| FI95079C (en) | Automatic particle analysis method and apparatus for carrying out the assay | |
| US6629010B2 (en) | Control feedback system and method for bulk material industrial processes using automated object or particle analysis | |
| KR101926641B1 (en) | Analysis system for screening organic and inorganic materials in construction waste and recycled aggregate production method using the same | |
| Rao et al. | Coarse aggregate shape and size properties using a new image analyzer | |
| TW201428263A (en) | System and methods of determining liquid phase turbidity of multiphase wastewater | |
| CA1057973A (en) | Balling process with fluid control | |
| CN116631536A (en) | Method for calculating permeable concrete aggregate uniformity index in image processing view | |
| CN112903764B (en) | Detection method and detection system for water content of sandstone aggregate and concrete production equipment | |
| CN110274844B (en) | Method and device for diagnosing drying process in sintered fuel grain composition detection system | |
| CN103940793B (en) | Fluorescence detecting system and detection method | |
| CN113566891A (en) | Multi-factor on-site detection method and device in loading and unloading process of bulk grains | |
| CN108508053A (en) | A kind of detection method of the atomic physical imperfection of systematicness | |
| CN106940176B (en) | A kind of thickness of feed layer detection device and method | |
| JP2009294178A (en) | Apparatus and method for measuring sand | |
| KR20200110129A (en) | System for integrated managing of production history for concrete products | |
| CA1323791C (en) | Controlling water input to pulp washing system based on measurements on reduced dimension stream | |
| JPH1048204A (en) | Method for measuring surface moisture rate in fresh concrete production plant | |
| FI120604B (en) | Method for improving the accuracy of humidity measurement based on electrical properties or electromagnetic wave motion | |
| CN103575656A (en) | Mobile device and method for detecting illegal cooking oil by utilizing mobile device | |
| JP2017166835A (en) | Surface water amount management method for construction material | |
| EP3709111A1 (en) | Integrated management system for production history of concrete product | |
| JP6823522B2 (en) | Water content evaluation method for construction materials |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |