CN114193624A - Concrete mixing proportion accurate regulation and control system and method based on aggregate moisture content dynamic monitoring - Google Patents
Concrete mixing proportion accurate regulation and control system and method based on aggregate moisture content dynamic monitoring Download PDFInfo
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- CN114193624A CN114193624A CN202111405019.0A CN202111405019A CN114193624A CN 114193624 A CN114193624 A CN 114193624A CN 202111405019 A CN202111405019 A CN 202111405019A CN 114193624 A CN114193624 A CN 114193624A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0404—Proportioning
- B28C7/0409—Proportioning taking regard of the moisture content of the solid ingredients; Moisture indicators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0404—Proportioning
- B28C7/0418—Proportioning control systems therefor
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- 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
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Abstract
A concrete mix proportion accurate regulation and control system and method based on aggregate moisture content dynamic monitoring comprises a microwave humidity sensor, a signal transmission device and a data acquisition and analysis device, can effectively overcome a series of problems of long time consumption, poor sampling representativeness, lagged results, inaccurate concrete mix proportion control and the like of the traditional aggregate moisture content test, adopts an aggregate moisture content monitoring system to ensure that the deviation of a test value and a true value is within +/-10 percent, has the advantages of high precision, real-time monitoring, manpower and material resource saving and the like, can effectively ensure the precision of the aggregate dosage and the mixing water dosage during the concrete proportioning, realize the precise regulation and control of the concrete proportioning, and further effectively improving the construction quality of the harbor engineering, is an important technical means for intelligent production and quality control of high-quality concrete in the future, and has important significance for realizing safe quality engineering in centuries.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a concrete mixing proportion accurate regulation and control system and method based on aggregate moisture content dynamic monitoring.
Background
A new idea of creating quality engineering is clearly proposed in a national highway water transport engineering quality safety working meeting, the 2016 national traffic transport working meeting requires improvement of infrastructure quality, modern engineering management is carried out, quality improvement actions of highway water transport construction engineering are carried out, and the quality engineering is created in an effort. The concrete, the most important building material and the most used amount in the engineering, is the core of creating quality engineering.
The quality of concrete is influenced by the quality of raw materials, production process, pouring process, construction environment and other factors, and the quality fluctuation of the raw materials needs to be paid attention particularly. As the sandstone aggregate with the largest component ratio weight in the concrete mix proportion, local materials are generally adopted, the production is carried out in the open air, the problem of influence of the environment is particularly prominent, the production quality of the concrete is restricted for a long time, particularly for high-performance concrete of harbor engineering, the low water-cement ratio is one of key factors for guaranteeing whether a concrete structure can have excellent seawater corrosion resistance, particularly for the concrete produced by a marine concrete structure by using a mixing vessel, the sandstone aggregate is difficult to establish a closed stock bin, the aggregate water content condition difference of different parts is large due to the influence of the environments such as rainwater, sunshine and the like, if the actual water content condition of the sandstone aggregate cannot be accurately known so as to accurately control the concrete mixing water consumption, the quality of the concrete can be greatly influenced, and the construction quality of the engineering structure is further influenced.
According to the requirements of concrete construction Specification for Water transportation engineering (JTS 202): the moisture content of the aggregate should be regularly checked in the construction process, and each work shift should be measured at least 2 times, and when the moisture content has obvious change, should be measured and adjusted in time. At present, the moisture content of the sandstone aggregate is generally tested by adopting on-site sampling and drying tests, a series of problems of long test time consumption, poor sampling representativeness, delayed results and the like mainly exist, the actual water consumption of the concrete and the aggregate consumption are difficult to be ensured to be consistent with the design consumption, the moisture content of the aggregate is difficult to be effectively monitored in real time in the actual construction process, and the concrete construction mix proportion is difficult to be effectively supported by timely adjusting. The online monitoring method for testing the water content of the material mainly comprises a capacitance method, a resistance method, a neutron method, an infrared method and the like, but the online monitoring method has not been widely popularized and applied in the concrete production process because the instruments and equipment are greatly influenced by environmental materials, the accuracy of a test result is not high, the stability is poor, the equipment is expensive, the maintenance difficulty is high and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a concrete mixing proportion accurate regulation and control system and method based on aggregate moisture content dynamic monitoring, and aims to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides an accurate regulation and control system of concrete mix proportion based on aggregate moisture content dynamic monitoring, includes:
the device comprises a microwave humidity sensor, a signal transmission device and a data acquisition and analysis device;
the microwave humidity sensor is arranged in the concrete mixing station;
the data acquisition and analysis device comprises a control host and an analysis host;
the microwave humidity sensor is connected with the control host through a signal transmission device.
Preferably, the signal transmission device comprises a communication interface device and a network adapting device, and the microwave humidity sensor is directly connected with the control host through the communication interface device or is in network connection with the control host through the network adapting device.
Preferably, the microwave humidity sensor is arranged on a concrete mixing station and is arranged on a feed opening of aggregate of the concrete mixing station or a belt conveyor conveyer belt.
Preferably, the communication interface device is an RS485 communication interface, and the RS485 communication interface directly connects the plurality of microwave humidity sensors to the control host in a daisy chain manner.
The invention also comprises a concrete mixing proportion accurate regulation and control method based on the aggregate moisture content dynamic monitoring, which adopts the concrete mixing proportion accurate regulation and control system based on the aggregate moisture content dynamic monitoring and comprises the following steps:
s1, arranging the microwave humidity sensor at a feed opening of the aggregate of the on-site concrete mixing station or a conveyor belt of a belt conveyor;
s2, connecting the signal output end of the microwave humidity sensor with the signal access end of the data acquisition and analysis device through the signal transmission device;
and S3, dynamically determining the water consumption for concrete mixing and the input amount of raw materials such as aggregate by the data acquisition and analysis device according to the aggregate moisture content information monitored by the microwave humidity sensor.
Preferably, in step S1, the probe of the microwave humidity sensor should form an angle of 30 ° to 50 ° with the falling direction of the aggregate.
Preferably, in step S3, before the microwave humidity sensor collects information, the system is required to test the non-standard values of the aggregates with different moisture contents, test the real moisture contents of the aggregates with different gradient moisture contents by a drying method, establish the relationship between the moisture contents of the aggregates and the non-standard values of the microwave humidity sensor, and determine the standard calibration curve equation of the aggregate humidity: y isWater content ratio＝0.2233xNon-calibrated value-3.335。
Preferably, the established standard calibration curve equation of the aggregate humidity is input into the data acquisition and analysis device, and the moisture content of the aggregate can be dynamically and automatically obtained in real time according to the standard calibration curve system of the aggregate humidity when the aggregate flows through the microwave humidity sensor in the production process of the concrete.
Preferably, in S3, considering that the microwave humidity sensor is influenced by factors such as uneven contact surface of the material flow passing through the sensor probe before the aggregate is started and finished, unstable flow rate, etc., which causes large fluctuation of the aggregate data before the aggregate is started and finished, functional processing such as signal smoothing processing, averaging and the like needs to be performed in the data acquisition and analysis device, the real material acquisition time is determined through a field test, the aggregate data before the start and the finish are rejected, and the aggregate moisture content information thrown in the concrete mixing station can be determined through the averaging function.
Preferably, the method further comprises the step of S4, integrating the regulation and control system into a concrete production control management system, transmitting the average moisture content of the aggregate obtained by the humidity sensor to the concrete production control management system, and adjusting the aggregate usage amount and the mixing water usage amount during concrete batching according to the moisture content condition of the aggregate by the concrete production control management system to regulate and control the concrete mixing ratio.
Compared with the prior art, the invention has the beneficial effects that:
the concrete mix proportion accurate regulation and control system and method based on aggregate moisture content dynamic monitoring can effectively overcome a series of problems of long time consumption, poor sampling representativeness, lag results, inaccurate concrete mix proportion control and the like in the traditional aggregate moisture content test, has the advantages of high accuracy, real-time monitoring, manpower and material resource saving and the like by adopting the deviation of a test value and a true value of an aggregate moisture content monitoring system, can effectively ensure the accuracy of aggregate consumption and mixing water consumption during concrete mixing, realizes accurate regulation and control of the concrete mix proportion, further effectively improves the construction quality of harbor engineering, is an important technical means for intelligent production and quality control of high-quality concrete in the future, and has important significance for realizing the peaceful century quality engineering.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals:
the method comprises the following steps of 1-a feeding hole of aggregate of a concrete mixing station, 2-a microwave humidity sensor, 3-a communication interface device and 4-a data acquisition and analysis device.
Detailed Description
In order to make the technical problems solved, technical solutions adopted, and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention are described in further detail below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1:
according to the technical scheme, the concrete mixing proportion accurate regulation and control system based on the aggregate moisture content dynamic monitoring comprises:
the device comprises a microwave humidity sensor 2, a signal transmission device and a data acquisition and analysis device 4;
the microwave humidity sensor 2 is arranged at the concrete mixing station;
the data acquisition and analysis device 4 comprises a control host and an analysis host;
the microwave humidity sensor 2 is connected with the control host through a signal transmission device.
Specifically, the signal transmission device comprises a communication interface device 3 and a network adapting device, and the microwave humidity sensor 2 is directly connected with the control host through the communication interface device 3 or is in network connection with the control host through the network adapting device.
Specifically, microwave humidity transducer 2 locates the concrete mixing station and locates the feed opening or the band conveyer of the aggregate of concrete mixing station.
Specifically, the communication interface device 3 is an RS485 communication interface, and the RS485 communication interface directly connects the plurality of microwave humidity sensors 2 to the control host in a daisy chain manner.
The invention also comprises a concrete mixing proportion accurate regulation and control method based on the aggregate moisture content dynamic monitoring, which adopts the concrete mixing proportion accurate regulation and control system based on the aggregate moisture content dynamic monitoring and comprises the following steps:
s1, arranging the microwave humidity sensor 2 at a feed opening of the aggregate of the on-site concrete mixing station or a conveyor belt of a belt conveyor;
s2, connecting the signal output end of the microwave humidity sensor 2 with the signal access end of the data acquisition and analysis device 4 through the signal transmission device;
s3, considering that aggregate data fluctuation before the initiation and the termination of the aggregate is large due to the influence of factors such as uneven contact surface and unstable flow rate of the material flowing through the sensor probe before the initiation and the termination of the aggregate on the microwave humidity sensor 2, the functions of signal smoothing processing, averaging and the like on the interface of data acquisition and analysis software are required to be set, and high-level noise caused by the irregularity of the signals during the flowing of the material is eliminated, so that the precision of the test result is improved. According to the field test, aggregate data 1.0s before the beginning and the end of the aggregate data are removed, and the average non-calibration of the thrown aggregates can be determined through the averaging function;
adopting a system to test the non-standard values of the fine aggregates with different water contents, testing the real water contents of the aggregates with different gradient water contents by a drying method, establishing the relationship between the water contents of the aggregates and the non-standard values of the microwave humidity sensor 2, and determining a standard calibration curve equation of the humidity of the aggregates: y isWater content ratio＝0.2233xNon-calibrated value-3.335；
Inputting the established standard calibration curve equation into the data acquisition and analysis software, calculating the moisture content of the aggregate by reverse extrapolation according to the humidity calibration curve, and displaying the moisture content in a control system in real time;
the field continuous monitoring is carried out for 2 months, monitoring data of 60 groups of field sand are collected, the field sand is sampled while the aggregate moisture content is monitored on the field, and the real moisture content of the field sand is tested by adopting a drying method. Through the analysis of the field test result, the monitoring value of the microwave humidity monitoring sensor has better correlation with the field measured value: y isMonitoring value＝0.9776xMeasured valueThe +0.1087R2 is 0.9831, the deviation between the monitoring value and the measured value measured by the aggregate monitoring sensor is basically +/-10%, and the accuracy is high, which indicates that the moisture content of the aggregate can be monitored by the microwave humidity monitoring sensor.
According to the aggregate moisture content information monitored by the microwave humidity sensor 2, the data acquisition and analysis device 4 dynamically determines the concrete mixing water consumption and the input amount of raw materials such as aggregates.
Specifically, in step S1, the probe of the microwave humidity sensor 2 should form an angle of 30 ° to 50 ° with the falling direction of the aggregate, so as to ensure that the aggregate smoothly flows through the probe of the sensor and is not easy to adhere to the surface of the probe.
Specifically, in step S3, the microwave wetBefore the information is collected by the degree sensor 2, the system is required to be used for testing the non-calibration values of the aggregates with different water contents, testing the real water contents of the aggregates with different gradient water contents by a drying method, establishing the relation between the water contents of the aggregates and the non-calibration values of the microwave humidity sensor 2, and determining the standard calibration curve equation of the humidity of the aggregates: y isWater content ratio＝0.2233xNon-calibrated value-3.335。
Specifically, the established standard calibration curve equation of the aggregate humidity is input into the data acquisition and analysis device 4, and in the concrete production process, when the aggregate flows through the microwave humidity sensor 2, the moisture content of the aggregate can be dynamically and automatically obtained in real time according to the aggregate humidity standard calibration curve system.
Specifically, the method further comprises the step S4 of integrating the regulation and control system into a concrete production control management system, transmitting the average moisture content of the aggregate obtained by the humidity sensor to the concrete production control management system, and adjusting the aggregate using amount and the mixing water using amount during concrete batching according to the moisture content condition of the aggregate by the concrete production control management system to regulate and control the concrete mixing ratio.
The concrete mix proportion accurate regulation and control system based on aggregate moisture content dynamic monitoring can monitor different aggregates for concrete simultaneously, for example, concrete mixing stations adopt different grades of coarse aggregates (large stones and small stones), different types of fine aggregates (superfine sand and machine-made sand) and other conditions, a humidity sensor is arranged on a discharge port or a belt conveyor belt of the different types of aggregates, and the humidity sensor is directly connected to a control system or a PC host computer in a daisy chain manner by adopting an RS485 communication interface so as to realize the operation.
Compared with the prior art, the concrete mix proportion accurate regulation and control system and method based on aggregate moisture content dynamic monitoring can effectively overcome a series of problems of long time consumption, poor sampling representativeness, lagged results, inaccurate concrete mix proportion control and the like in the traditional aggregate moisture content test, has the advantages of high precision, real-time monitoring, manpower and material resource saving and the like by adopting the deviation of the test value of the aggregate moisture content monitoring system and the true value within +/-10 percent, can effectively ensure the precision of the aggregate consumption and the mixing water consumption during concrete mixing, realizes accurate regulation and control of the concrete mix proportion, further effectively improves the construction quality of harbor engineering, is an important technical means for intelligent production and quality control of high-quality concrete in the future, and has important significance for realizing the century-quality engineering.
In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are used in an orientation or positional relationship merely for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, configuration, and operation in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. The utility model provides an accurate regulation and control system of concrete mix proportion based on aggregate moisture content dynamic monitoring which characterized in that includes:
the device comprises a microwave humidity sensor, a signal transmission device and a data acquisition and analysis device;
the microwave humidity sensor is arranged in the concrete mixing station;
the data acquisition and analysis device comprises a control host and an analysis host;
the microwave humidity sensor is connected with the control host through a signal transmission device.
2. The system for accurately regulating and controlling the mix proportion of the concrete based on the dynamic monitoring of the moisture content of the aggregate as claimed in claim 1, wherein the signal transmission device comprises a communication interface device and a network adapting device, and the microwave humidity sensor is directly connected with the control host through the communication interface device or is in network connection with the control host through the network adapting device.
3. The system for accurately regulating and controlling the mix proportion of concrete based on the dynamic monitoring of the water content of aggregate according to claim 1, wherein the microwave humidity sensor is arranged at a feed opening of the aggregate of the concrete mixing station or a conveyor belt of a belt conveyor of the concrete mixing station.
4. The system for accurately regulating and controlling the mix proportion of the concrete based on the dynamic monitoring of the moisture content of the aggregate as claimed in claim 2, wherein the communication interface device is an RS485 communication interface, and the RS485 communication interface directly connects a plurality of the microwave humidity sensors to a control host in a daisy chain manner.
5. A concrete mix proportion accurate regulation and control method based on aggregate moisture content dynamic monitoring is characterized in that the concrete mix proportion accurate regulation and control system based on aggregate moisture content dynamic monitoring of claim 1 is adopted, and the method comprises the following steps:
s1, arranging the microwave humidity sensor at a feed opening of the aggregate of the on-site concrete mixing station or a conveyor belt of a belt conveyor;
s2, connecting the signal output end of the microwave humidity sensor with the signal access end of the data acquisition and analysis device through the signal transmission device;
and S3, dynamically determining the water consumption for concrete mixing and the input amount of raw materials such as aggregate by the data acquisition and analysis device according to the aggregate moisture content information monitored by the microwave humidity sensor.
6. The system for accurately regulating and controlling the mix proportion of the concrete based on the dynamic monitoring of the moisture content of the aggregates as claimed in claim 5, wherein in step S1, the probe of the microwave humidity sensor should form an included angle of 30-50 degrees with the falling direction of the aggregates.
7. The system for accurately regulating and controlling the mix proportion of the concrete based on the dynamic monitoring of the moisture content of the aggregates as claimed in claim 5, wherein in step S3, before the information is collected by the microwave humidity sensor, the system is required to be used for testing the non-standard values of the aggregates with different moisture contents, testing the real moisture contents of the aggregates with different gradient moisture contents by a drying method, establishing the relationship between the moisture content of the aggregates and the non-standard values of the microwave humidity sensor, and determining the standard calibration curve equation of the moisture content of the aggregates: y isWater content ratio＝0.2233xNon-calibrated value-3.335。
8. The system for accurately regulating and controlling the mix proportion of the concrete based on the dynamic monitoring of the moisture content of the aggregates as claimed in claim 7, wherein the established standard calibration curve equation of the moisture content of the aggregates is input into the data acquisition and analysis device, and the moisture content of the aggregates can be dynamically and automatically obtained in real time according to the standard calibration curve system of the moisture content of the aggregates when the aggregates flow through the microwave moisture sensor in the production process of the concrete.
9. The concrete mix proportion accurate regulation and control system based on aggregate moisture content dynamic monitoring of claim 5, characterized in that in S3, considering that the microwave humidity sensor is influenced by factors such as uneven contact surface of material flow passing through the sensor probe before the aggregate is started and finished, unstable flow rate and the like, which cause large aggregate data fluctuation before the aggregate is started and finished, functional processing such as signal smoothing processing and averaging is required to be carried out in the data acquisition and analysis device, real material acquisition time is determined through field tests, aggregate data before the start and the finish are removed, and aggregate moisture content information fed in the concrete mixing station can be determined through the averaging function.
10. The concrete mix proportion accurate regulation and control system based on aggregate moisture content dynamic monitoring of claim 5, further comprising a step S4 of integrating the regulation and control system into a concrete production control management system, transmitting the average moisture content of the aggregate obtained by the humidity sensor to the concrete production control management system, and the concrete production control management system can regulate and control the mix proportion of the concrete by adjusting the aggregate amount and the mixing water amount during the concrete mixing according to the moisture content condition of the aggregate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116819053A (en) * | 2023-08-29 | 2023-09-29 | 辽宁省路桥建设集团有限公司 | Online detection device and detection method for water content of concrete aggregate |
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