CN113252740A - Concrete mixing plant sand water content dynamic monitoring system and method - Google Patents
Concrete mixing plant sand water content dynamic monitoring system and method Download PDFInfo
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Abstract
The system comprises a collection device, wherein the collection device is connected with a front-end host, the front-end host is connected with a server, and the server is connected with a client. The acquisition device comprises a sand dielectric property sensing module and a test probe, and the sand dielectric property sensing module is connected with the test probe. The preposed host downloads data from the server, sends an acquisition instruction to the acquisition device, receives and stores the data acquired by the acquisition device, and uploads the data to the server at regular time; the client accesses the server and is used for setting basic data and inquiring information of the monitoring system; and the server is used for storing the basic data of the monitoring system and the data uploaded by the front host and carrying out operation processing on the data. The collection device comprises a sand flow shaping plate. The invention can obtain the water content of the sand for production of the concrete mixing plant in real time, provides data support for timely adjusting related ingredients of concrete, and is beneficial to improving the production quality of the concrete.
Description
Technical Field
The invention relates to a system and a method for dynamically monitoring the water content of concrete mixing plant sand, which are suitable for controlling the mixing quality of concrete.
Background
During the production and operation of a concrete mixing plant, the water content state of the actual sand is inconsistent with the reference state specified by the mixing proportion, so the actual consumption of the sand is adjusted according to the water content of the sand on the basis of the reference consumption, and the water content of the sand needs to be tested. A common moisture content testing method is a drying method, and the basic process is that a representative sample is extracted, the mass of the sample in an actual state is measured, then the sample is dried to remove moisture, the mass of the sample in a dry state is measured, and the mass percentage of the moisture in the sample is calculated, so that the moisture content is obtained. The water content test is required to be carried out regularly in the concrete production process, for example, the specification of hydraulic concrete construction specification DL/T5144-2015 is provided, the sand water content is tested for 1 time every 4h, and the special conditions such as rain and snow are required to be encrypted for detection. From the conventional sand water content testing method and the testing frequency, the testing process is long in time consumption and the testing frequency is low. In fact, the moisture content of the sand used for producing each disc of concrete is changed, and under some conditions, the change is large, and the traditional test mode cannot test the moisture content in time and adjust the ingredients in time, so that the improvement of the uniformity of the concrete mixture is restricted.
At present, the development of sensor technology, computer technology and internet of things technology lays a foundation for the realization of a new mode of dynamic monitoring of the water content of the sand.
Disclosure of Invention
The invention provides a system and a method for dynamically monitoring the water content of concrete mixing plant sand, which can acquire the water content of the sand for production of the concrete mixing plant in real time, provide data support for timely adjusting relevant ingredients of concrete and are beneficial to improving the production quality of the concrete. Compared with the existing water content testing method, the water content testing method is more convenient to detect and can improve the detection frequency.
The technical scheme adopted by the invention is as follows:
the system comprises an acquisition device, a server and a client, wherein the acquisition device is connected with a front-end host, the front-end host is connected with the server, and the server is connected with the client;
the collecting device comprises a sand dielectric property sensing module and a test probe, the sand dielectric property sensing module is connected with the test probe, and the sand dielectric property sensing module is used for sensing the water content of the sand.
The preposed host downloads data from the server, sends an acquisition instruction to the acquisition device, receives and stores the data acquired by the acquisition device, and uploads the data to the server at regular time;
the client accesses the server and is used for setting basic data and inquiring information of the monitoring system;
and the server is used for storing the basic data of the monitoring system and the data uploaded by the front host and carrying out operation processing on the data. The collecting device comprises a sand flow shaping plate and is arranged on a sand conveying belt bracket of the mixing plant through a fixing frame; the fixing frame is connected with the sand flow shaping plate.
The sand flow shaping plate is an electric insulating plate, and two test probes are fixed on the lower surface of the sand flow shaping plate; the test probes are streamline strip-shaped stainless steel blocks, the axes of the two test probes are parallel to each other, and the sand dielectric property sensing module is connected with the two test probes respectively. The sand dielectric property sensing module is connected with the signal transmission module, and the signal transmission module is used for providing a power supply for the sand dielectric property sensing module, sending a wireless signal to the front host and transmitting collected information.
The sand dielectric property sensing module, the signal transmission module and the module protection box are fixed in the module protection box, and the module protection box is fixed on the upper surface of the sand flow shaping plate.
The invention discloses a concrete mixing plant sand water content dynamic monitoring system and a method, and the technical effects are as follows:
1) the invention can realize the dynamic monitoring of the water content of the sand, namely, the water content of the sand is detected in real time, so that each batch is adjusted, the consistency of the real consumption of materials among different disks of the same concrete is kept as much as possible, the uniformity of the workability and the hardening performance of concrete mixture is finally realized, and the quality of concrete entities is improved.
2) According to the invention, the collection device with the fish-shaped test probe is arranged on the mixing plant sand material conveying belt, the dielectric property of the sand flow is sensed, and the water content of the sand is measured, so that the compaction degree of the sand flow and the contact tightness degree of the tested sand material and the probe are kept consistent, and the measurement error is reduced.
3) The invention improves the stability of system operation and application convenience by the framework of the preposed host and the server, realizes high-frequency and dynamic monitoring of the water content of the sand, and lays a foundation for dynamic adjustment of batching related to the water content disc by disc in concrete production.
Drawings
Fig. 1 is a schematic structural diagram of a monitoring system according to the present invention.
FIG. 2 is a graph showing a typical water cut change process in the example.
FIG. 3 is a schematic diagram of the on-line satisfactory peak value of the change process of water content in the example.
Detailed Description
As shown in figure 1, the system for dynamically monitoring the water content of the sand in the concrete mixing plant comprises four parts, namely an acquisition device 1, a front host 2, a server 3 and a client 4, wherein the front host 2 is arranged near the acquisition device 1, and the acquisition device 1 consists of a fixed frame 5, a sand flow shaping plate 6, a test probe 7, a sand dielectric property sensing module 8, a signal transmission module 9 and a module protection box 10.
The size, shape, installation direction of test probe 7, the settlement of spacing distance does benefit to by survey sand flow and probe area of contact big, the contact is inseparable to the contact condition is stable, thereby makes the survey value accuracy improve, also does benefit to sand flow and smoothly passes through, does not too much influence production, simultaneously, also suits with sand dielectric property perception module 8's performance, and test probe 7's settlement is skew too big, can surpass sand dielectric property perception module 8's perception scope.
During the installation, collection system 1 spanes in amalgamation building sand conveyer belt top, make sand flow shaping plate 6 hug closely the upper surface of conveyer belt sand flow, it is higher slightly to the end to facing sand, about 5 with sand flow surface contained angle, make the less end of thickness of test probe 7 face sand to, the axis is parallel with sand flow direction, will be surveyed the sand material shaping once more through sand flow shaping plate 6, the uniformity of the closely knit degree of sand material has been strengthened, the uniformity of test probe 7 and sand material area of contact and the inseparable degree of contact has also been guaranteed simultaneously.
The sand dielectric property perception module 8 is respectively connected with the 2 test probes 7 through two wires, and the signal transmission module 9 is connected with the sand dielectric property perception module 8 through a wire to provide a power supply for the sand dielectric property perception module, send a wireless signal to the front host 2 and transmit collected information. The sand dielectric property sensing module 8 and the signal transmission module 9 are fixed in a module protection box 10, and the module protection box 10 is fixed on the upper surface of the sand flow shaping plate 6. This kind of setting makes collection system 1 wholeness stronger, portable and installation, and circuit module installs in the protection box, has kept apart dust and vapor in the environment, makes module operating condition more stable.
The signal transmission module 9 comprises 1 AP12N05-Zero type AC/DC power supply module and 1E 22400T22S1B type LoRa communication module.
The sand dielectric property sensing module 8 adopts a high-frequency capacitance type dielectric property sensing module, namely an HSL-66 molding sand dielectric property sensing module.
The prepositive host 2 downloads data from the server 3, sends an acquisition instruction to the acquisition device 1, receives and stores the data acquired by the acquisition device 1, and uploads the data to the server 3 at regular time; the client 4 accesses the server 3 and performs basic data setting and information query on the system; the server 3 is used for storing the system basic data and the data uploaded by the front host 2 and performing operation processing on the data.
The system is provided with the prepositive host 2 which is positioned near the acquisition device 1, the prepositive host 2 downloads data from the server 3, sends an acquisition instruction to the acquisition device 1, receives and stores the data acquired by the acquisition device 1, and uploads the data to the server 3 at regular time instead of directly communicating the server 3 with the acquisition device 1, the architecture can ensure that the communication between the prepositive host 2 and the acquisition device 1 adopts a more stable mode, ensures the stability and the real-time performance of the acquisition of the moisture content of the on-site sand, and can continue the data acquisition work under the condition that the communication between the prepositive host 2 and the server 3 is temporarily interrupted, so that the prepositive host 2, the server 3 and the client 4 can adopt the remote wireless network communication, and the system can realize the data monitoring in a wider regional span and the stable acquisition of the on-site data.
The sand dielectric property sensing module 8 is adopted for sensing the water content of the sand, and the sensing mode of the electric signal is quick in data acquisition and suitable for quick real-time acquisition. Because the system senses the water content of the sand by sensing the dielectric property of the sand, the water content measuring value is related to the compaction degree of the tested sand sample and is related to the contact area and the compaction degree of the sand sample and the test probe 7, the precision of the test result is improved, the stability of the compaction degree of the tested sand sample during the test is ensured, and the stability of the contact area and the compaction degree of the sand sample and the test probe 7 is ensured.
The invention discloses a monitoring system building and data processing method, which comprises the following steps:
1) a dynamic monitoring system is set up, so that the acquisition device 1, the front host 2, the server 3 and the client 4 are communicated smoothly;
2) when the device is installed, the acquisition device 1 stretches across the upper part of a sand conveying belt of a mixing plant, so that the sand flow shaping plate 6 is tightly attached to the upper surface of sand flow on the conveying belt, the end facing the sand coming direction is slightly higher, the included angle between the sand flow shaping plate and the surface of the sand flow is about 5 degrees, the end with smaller thickness of the test probe 7 faces the sand coming direction, and the axis is parallel to the sand flow direction;
3) collecting the water content value of the sand at regular time intervals of 3 to 10 seconds, recording the process line of the change of the water content value of the sand along with the time, backtracking the process line, and finding out the latest peak value which meets the requirement as the latest water content test result. The data processing method is used for ensuring the consistency of the contact tightness degree during testing and improving the testing precision by taking the measured value of the closest contact time when the sand material and the testing probe 7 move relatively and the contact tightness is the latest moisture content testing result when the conveying belt moves. Because, when the sand material is static, the contact tightness between the sand material and the test probe 7 is gradually reduced along with the time, and the collected sand moisture content value is gradually reduced under the same sand moisture content, and the sand moisture content value cannot be used as the latest moisture content test result.
The satisfactory peak is defined as: let it be assumed that there are 4 adjacent water cut values in the process line, W in chronological orderi-2， Wi-1，Wi，Wi+1And k is a coefficient larger than 1 and is determined according to field test results. When W isi/Wi-1>k or Wi/Wi-2>k, and, Wi≥Wi+1Then W isiIs a satisfactory peak.
4) Before the device is used, the monitoring system is calibrated to obtain a corresponding relation curve of the instrument water content raw code and the sand water content standard value, namely a calibration curve, and the calibration curve is input into the system, wherein the water content standard value is obtained through a drying method indoor test. The monitoring system calculates the instrument measurements by linear interpolation according to the calibration curve.
5) The calibration method comprises the following steps:
in the first step, a calibration curve is established in the laboratory. Taking not less than 100kg of sand for a mixing plant, and preparing a plastic cylinder with the inner diameter not less than 300mm and the depth not less than 450 mm. Because the plastic cylinder is not made of metal materials, adverse effects on the dielectric property of the system sensing sand caused by the metal materials are avoided. The limitation of the size of the cylinder ensures the quantity of sand samples filled in the cylinder, so that the sand samples have representativeness and the operation inconvenience caused by overlarge volume is avoided. Drying the sand until the water content is 0, namely the standard value of the water content is 0%, and then loading the sandAnd scraping the redundant sand by using a ruler until the sand is about 20mm higher than the upper edge of the plastic cylinder, so that the sand surface is flush with the upper edge of the cylinder. Then, 2 test probes 7 are pressed into the sand surface, the water content of the sand in the cylinder is tested by a dynamic monitoring system, and the original W of the instrument water content under the water content is obtained0. Adding water into the sand in sequence, preparing the standard value of the water content into 2%, 4%, 6%, 8%, 10%, 12% and the like, and obtaining the corresponding original W of the instrument water content according to the method2、W4、W6、W8、W10、W12And establishing a coordinate system by taking the original code of the water content of the instrument as an abscissa and the standard value of the water content as an ordinate, and taking the reference coordinate point (0 percent, W)0)、(2％，W2)、(4％，W4)、(6％，W6)、(8％， W8)、(10％，W10)、(12％，W12) And drawing the reference coordinate points into a coordinate system, connecting the adjacent reference coordinate points by using straight line segments to obtain a broken line consisting of multiple line segments, namely a calibration curve. Each line segment forming the broken line is expressed by a linear equation, and an equation system formed by the linear equations expresses the relation between the original water content code of the instrument and the standard water content value.
And secondly, performing translation correction on the calibration curve in the mixing plant. Original water content W of instrument is tested on sand conveying belt of mixing plantiSimultaneously, a sand sample is taken from the conveying belt, and the standard value W of the water content is measuredsW is to besSubstituting the calibration curve to obtain the corresponding instrument water content original code WisLet the deviation value delta be Wi-WisAnd adding delta to instrument water content original codes of all reference coordinate points in the calibration curve, and performing translation correction on the calibration curve.
And thirdly, replacing or newly adding and correcting the reference coordinate point of the calibration curve in the mixing plant. Coordinate point (W)s，Wi) Plotted into a coordinate system if it WsThe coordinate point (W) is used when the difference from the moisture content standard value of the nearest reference coordinate point is less than 0.5%s， Wi) Replacing the reference coordinate point, otherwise, the coordinate point (W) is replaceds，Wi) As a new additionThe reference coordinate points are added to the calibration curve and the calibration curve is modified accordingly. And repeating the second step and the third step regularly, and continuously correcting the calibration curve.
The method for establishing the calibration curve in the test room, performing the translation correction of the calibration curve in the mixing plant and performing the substitution or new addition correction of the reference coordinate point of the calibration curve in the mixing plant can realize the purpose of providing the corresponding relation between the original water content code and the standard water content value for the system in a short time, and can gradually optimize and correct so that the system can be put into operation quickly. Because the water content of the sand usually does not change greatly from 0% to 12% in a short time in the running process of the mixing plant, the time consumption for establishing a complete calibration curve completely by the field test of the mixing plant is very long, the system can not be put into application in time without the calibration curve, the curve can be established by manually preparing the sand water content with large amplitude indoors, and the calibration curve is corrected by the field test of the mixing plant, so the method solves the problem of delayed establishment of the calibration curve.
Example (b):
a concrete mixing plant is arranged at a hydropower station building site, and a section of conveying belt is arranged between a discharge port of a temporary sand silo at a third layer in the building and a sand weighing hopper and is used for conveying sand materials. The collecting device 1 is installed at the tail end of the conveying belt, and a fixing frame 5 of the collecting device 1 and a conveying belt bracket are made of steel materials and are connected in a spot welding mode. A rectangular outlet is formed by the sand bin discharge port and the upper surface of the conveying belt in a surrounding mode, when the conveying belt works, sand flowing out of the outlet is pulled into a rectangular sand flow by the conveying belt, and finally the sand flow falls into the sand weighing hopper. The sand flow shaping plate is pressed into the tail end of the cuboid sand flow, faces the sand flow and slightly faces upwards towards the end to form a horn mouth, and therefore the sand flow enters the horn mouth, is further compacted and clings to 2 test probes 7 to flow through. There is the high frequency electric field between 2 test probe 7, and the dielectric property of the sand flow that flows through the electric field can be followed sand moisture content and changed, is fixed the sand dielectric property perception module 8 perception in sand flow shaping plate 6 upper surface module protection box 10 and is arrived to form digital signal and send with wireless mode through signal transmission module 9. The preposed host installed in the central control room on the second floor of the mixing plant is an industrial control computer which receives digital signals with sand moisture content information at regular time, stores the digital signals together with the acquisition time information and uploads the digital signals to the cloud server through a wireless communication network. The client 4 can remotely access the cloud server through the internet to inquire the change process of the water content. A typical water cut profile is shown in FIG. 2.
In fig. 2, a section of water content change process line obtained by the collecting device named "sand 1-fish type" is shown, and the time range is as follows: 2021-03-1910: 57:28 to 2021-03-1914: 57:28, with time on the abscissa and moisture content value on the ordinate. It can be seen that the water content value before 13:00 gradually becomes smaller, and then a higher platform is reached, the corresponding practical situation of the phenomenon is that the sand on the conveying belt is in a static state in the period before 13:00, the conveying belt does not work for a long time, the contact between the sand material and the fish-type probe is not tight any more, the water content value is reduced, the true water content is not reduced, and after 13:00, the conveying belt starts to work, the contact between the sand material and the fish-type probe is in a tight state, and the water content value is increased. It can be seen that not all points on the process line can be used as the moisture content test results, and data processing is required, wherein the principle of the data processing is that the measured value at the time when the sand material is in closest contact with the fish-type probe is used as the latest moisture content test result, and the closest contact means that the measured value is the largest, namely, the last peak value appearing before the current time point is found on the process line and is used as the latest moisture content test result. In fig. 2, several outliers of the measurement points with water content values close to 0 belong to outliers, which are filtered out first during data processing.
The method for judging the peak value meeting the requirement on the water content change process line is shown in figure 3. W in FIG. 3i-2＝6.39， Wi-1＝6.51，Wi＝6.63，Wi+1K is 6.63, and k is 1.02.
Wi/Wi-1＝6.63/6.51＝1.018<k；Wi/Wi-2＝6.63/6.39＝1.038>k；Wi＝Wi+1；
WiThe peak definition is met, other points are not met, and 6.63 is the latest moisture content test result in fig. 3.
The 'sand 1-fish type' acquisition device is subjected to the processes of 'establishing a calibration curve in a test room', 'performing calibration curve translation correction in a mixing plant' and 'performing replacement or new addition correction on a reference coordinate point of the calibration curve in the mixing plant' before use, and the corresponding relation between the newly used calibration curve, namely the water content original code and the water content standard value is shown in table 1. The last calibration curve point (200.0, 10.5) was added empirically to filter out some of the excessive moisture content outliers that would occur.
TABLE 1 calibration chart for latest use of sand 1-fish type acquisition device
The statistical result of the measurement absolute error range of the concrete mixing plant sand water content dynamic monitoring system is +/-0.6%, and the requirements for dynamically sensing the water content and timely adjusting the concrete production ingredients can be met.
Claims (9)
1. Concrete mixing plant sand moisture content dynamic monitoring system, its characterized in that: the system comprises a collection device (1), wherein the collection device (1) is connected with a front host (2), the front host (2) is connected with a server (3), and the server (3) is connected with a client (4);
collection system (1) includes sand dielectric property perception module (8), test probe (7), and test probe (7) are connected in sand dielectric property perception module (8), and sand dielectric property perception module (8) are used for perception sand moisture content.
2. The system for dynamically monitoring the water content of concrete mixing plant sand according to claim 1, wherein: the prepositive host (2) downloads data from the server (3), sends an acquisition instruction to the acquisition device (1), receives and stores the data acquired by the acquisition device (1) and uploads the data to the server (3) at regular time;
the client (4) accesses the server (3) and is used for setting basic data and inquiring information of the monitoring system;
and the server (3) is used for storing the basic data of the monitoring system and the data uploaded by the front host (2) and carrying out operation processing on the data.
3. The system for dynamically monitoring the water content of concrete mixing plant sand according to claim 1, wherein: the collecting device (1) comprises a sand flow shaping plate (6), and the collecting device (1) is arranged on a sand conveying belt bracket (11) of a mixing plant through a fixing frame (5); the fixed frame (5) is connected with the sand flow shaping plate (6).
4. A system for dynamically monitoring the water content of concrete mix plant sand according to claim 3, wherein: the sand flow shaping plate (6) is an electric insulating plate, and two test probes (7) are fixed on the lower surface of the sand flow shaping plate; the test probes (7) are streamline strip-shaped stainless steel blocks, the axes of the two test probes (7) are parallel to each other, and the sand dielectric property sensing module (8) is connected with the two test probes (7) respectively.
5. The system for dynamically monitoring the water content of concrete mixing plant sand according to claim 4, wherein: the sand dielectric property perception module (8) is connected with the signal transmission module (9), and the signal transmission module (9) is used for providing a power supply for the sand dielectric property perception module (8) and sending a wireless signal to the front host (2) to transmit collected information.
6. The system for dynamically monitoring the water content of concrete mixing plant sand according to claim 4, wherein: the sand dielectric property sensing module (8) and the signal transmission module (9) are fixed in the module protection box (10), and the module protection box (10) is fixed on the upper surface of the sand flow shaping plate (6).
7. The method for dynamically monitoring the water content of the concrete mixing plant sand is characterized by comprising the following steps of:
step 1: building a dynamic monitoring system according to any one of claims 1-6;
step 2: when the device is installed, the collecting device (1) stretches across the upper part of a sand conveying belt of a mixing plant, so that the sand flow shaping plate (6) is tightly attached to the upper surface of sand flow on the conveying belt, the end facing the sand coming direction is slightly higher and forms a certain included angle with the surface of the sand flow, the end with smaller thickness of the test probe (7) faces the sand coming direction, and the axis is parallel to the sand flow direction;
and step 3: collecting the water content value of the sand at regular time, recording the process line of the change of the water content value of the sand along with the time, backtracking the process line, and finding out the latest peak value which meets the requirement as the latest water content test result.
8. The method for dynamically monitoring the water content of concrete batching plant sand according to claim 7, characterized in that: the satisfactory peak is defined as: there are 4 adjacent water cut values in the process line, W in chronological orderi-2，Wi-1，Wi，Wi+1K is a coefficient larger than 1, and is determined according to a field test result; when W isi/Wi-1>k or Wi/Wi-2>k, and, Wi≥Wi+1Then W isiIs a satisfactory peak.
9. A method for dynamically monitoring the water content of concrete mix plant sand according to claim 7, comprising a calibration method comprising the steps of:
first, a calibration curve is established in the laboratory:
testing the water content of the sand in a dry state by using a dynamic monitoring system to obtain an instrument water content original code W under the condition of 0% water content0(ii) a Adding water into the sand in sequence, preparing the standard value of the water content into 2%, 4%, 6%, 8%, 10%, 12% and the like, and obtaining the corresponding original W of the instrument water content according to the method2、W4、W6、W8、W10、W12And establishing a coordinate system by taking the original code of the water content of the instrument as an abscissa and the standard value of the water content as an ordinate, and taking the reference coordinate point (0 percent, W)0)、(2％，W2)、(4％，W4)、(6％，W6)、(8％，W8)、(10％，W10)、(12％，W12) Drawing the coordinate system, connecting adjacent reference coordinate points by using a straight line segment to obtain a coordinate systemThe strip is a broken line consisting of multiple line segments, namely a calibration curve; each line segment forming the broken line is expressed by a linear equation, and an equation set formed by the linear equations expresses the relation between the original water content code of the instrument and the standard water content value;
and secondly, performing calibration curve translation correction on the mixing plant:
original water content W of instrument is tested on sand conveying belt of mixing plantiSimultaneously, a sand sample is taken from the conveying belt, and the standard value W of the water content is measuredsW is to besSubstituting the calibration curve to obtain the corresponding instrument water content original code WisLet the deviation value delta be Wi-WisAdding delta to instrument water content original codes of all reference coordinate points in the calibration curve, and performing translation correction on the calibration curve;
thirdly, replacing or newly adding and correcting the calibration curve reference coordinate point in the mixing plant:
coordinate point (W)s，Wi) Plotted into a coordinate system if it WsThe coordinate point (W) is used when the difference from the moisture content standard value of the nearest reference coordinate point is less than 0.5%s，Wi) Replacing the reference coordinate point, otherwise, the coordinate point (W) is replaceds，Wi) Adding the new reference coordinate point into the calibration curve, and correcting the calibration curve according to the new reference coordinate point; and repeating the second step and the third step regularly, and continuously correcting the calibration curve.
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| CN204086190U (en) * | 2014-07-30 | 2015-01-07 | 四川国统混凝土制品有限公司 | Concrete mixing plant sand material detecting device for moisture content |
| CN206485893U (en) * | 2016-08-31 | 2017-09-12 | 北京住总商品混凝土中心 | With the conveyer of sand material moisture measurement device |
| CN106556545A (en) * | 2017-01-17 | 2017-04-05 | 葛洲坝集团试验检测有限公司 | A kind of concrete on construction site hardenability real-time feedback system and method |
| CN206479448U (en) * | 2017-02-14 | 2017-09-08 | 廊坊中建机械有限公司 | The non-contact detection system of moisture in a kind of material |
| CN108693204A (en) * | 2018-06-11 | 2018-10-23 | 南京航空航天大学 | A kind of sylvite ingredient on-line detection device |
| CN212111128U (en) * | 2020-04-14 | 2020-12-08 | 仁寿县旭昱商品混凝土有限公司 | Infrared detection system for detecting aggregate moisture content |
| CN111940673A (en) * | 2020-08-17 | 2020-11-17 | 于彦奇 | Online batch weighing sand moisture detector for sand mixer |
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