Prefabricated part concrete mixing moisture content compensation device and using method thereof

Abstract

The invention discloses a prefabricated part concrete mixing moisture content compensation device and a use method thereof, and belongs to the technical field of concrete prefabricated part production. Comprising a concrete mixer, an inclined conveying belt, a water storage tank and a control room, a plurality of optical fiber humidity sensors are evenly distributed on the inner wall of a mixing cavity of the concrete mixer in the circumferential direction, and the inclined conveying belt conveys gravel into the concrete mixer and is provided with a plurality of mounting frames; a plurality of mounting frames are arranged on the water storage tank and arranged in the conveying direction of the inclined conveying belt, microwave array sensors and temperature compensation circuits are mounted on the bottom surfaces of the mounting frames and located over a belt body of the inclined conveying belt, clean water is stored in the water storage tank, and a pumping part is mounted on the top surface of the water storage tank; the pumping part pumps clean water into a stirring cavity of the concrete stirring machine, and a PLC, a parameter input module and an algorithm processing unit are arranged in the control room.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated concrete production, in particular to a prefabricated concrete mixing water content compensation device and its use method. BACKGROUND

[0002] The mixing quality of prefabricated concrete directly determines the strength, durability and dimensional stability of the component, and the water content is the core parameter affecting the mixing quality of the concrete. If the water content is too high, the concrete slump will be too large, and the prefabricated component will be prone to shrinkage cracking and insufficient strength after forming. If the water content is too low, the mixed material will be dry and have poor flowability, and the vibration will not be compact, resulting in internal pores.

[0003] At present, the control of concrete water content in prefabricated component production mainly adopts a mixed method of manual detection and experience-based water compensation. This method has the following defects: The traditional drying method is used to detect the water content of aggregates, which takes a long time and the detection result cannot reflect the real-time change of aggregate humidity, so the compensation is lagging. Some use resistance sensors, which are easily affected by aggregate particle size and impurities, have large measurement errors and cannot meet the high-precision production requirements. Relying on the experience of operators to estimate the amount of water, there is a lack of quantitative calculation basis, and the water compensation amount is large, resulting in fluctuations in the water content of the same batch or different batches of concrete, and a high coefficient of variation of the strength of the prefabricated component. In view of the above problems, the present application provides a prefabricated concrete mixing water content compensation device and its use method, which realizes dynamic and accurate control of the water content of the concrete, and guarantees the stability of the production quality of the prefabricated component. SUMMARY

[0004] The purpose of the present application is to provide a prefabricated concrete mixing water content compensation device and its use method to solve the problems raised in the background art.

[0005] In view of the above problems, the technical solution proposed by the present application is: The utility model provides a prefabricated component concrete mixing moisture content compensation device, including concrete mixer, inclined conveyer belt, water storage tank, control room, the inside wall of stirring chamber of concrete mixer is evenly distributed with a plurality of fiber humidity transducer in circumference, the sand and stone is transported concrete mixer in the inclined conveyer belt, the inclined conveyer belt has a plurality of mounting bracket, and a plurality of mounting bracket is arranged along the conveying direction of inclined conveyer belt, the bottom surface of mounting bracket is equipped with microwave array type sensor and temperature compensation circuit, microwave array type sensor and temperature compensation circuit are located the upside of the belt of inclined conveyer belt, the water storage tank stores clean water, the top surface of water storage tank is equipped with pumping part, pumping part pumps clean water into the stirring chamber of concrete mixer, the control room is arranged with PLC controller, parameter input module and algorithm processing unit, PLC controller and microwave array type sensor, temperature compensation circuit, fiber humidity transducer electricity is connected, parameter input module is used to the preset data transmission of PLC controller, algorithm processing unit and PLC controller intercommunication data, the built -in compensation model of algorithm processing unit, the compensation model is used to dynamic calculation optimal water supply amount, microwave array type sensor and temperature compensation circuit cooperate, can carry out non -contact moisture content detection in the aggregate conveying process, correct the influence of ambient temperature to the detection result simultaneously, ensure that the aggregate real -time moisture content data is accurate, fiber humidity transducer evenly distributes in the inside wall of stirring chamber of concrete mixer, can real -time acquisition slurry humidity data, both and the compensation model of built -in PLC controller, algorithm processing unit cooperate, can dynamically capture the humidity change of aggregate and slurry, provide real -time, accurate basis for water supply amount calculation, and then realize the dynamic optimization of water supply amount, guarantee that concrete mixing moisture content meets the production requirement.

[0006] Further, the pumping part includes a protective cover mounted on the top surface of the water storage tank, the protective cover has a variable frequency water pump and a flow metering valve mounted therein, the output end of the variable frequency water pump is in communication with one end of the flow metering valve, a first conduit is in communication between the input end of the variable frequency water pump and the water storage tank, a second conduit is in communication between the other end of the flow metering valve and the concrete mixer, a plurality of atomizing nozzles are evenly distributed on the inner wall of the stirring chamber of the concrete mixer, a pipeline is connected between the atomizing nozzles, the second conduit and the pipeline are in communication, and a heat dissipation screen is embedded in the side surface of the protective cover. The variable frequency water pump cooperates with the flow metering valve to accurately adjust the water supply pressure and the water flow size, ensuring that the water supply amount is consistent with the optimal water supply amount calculated. The atomizing nozzles spray the atomized water into the stirring chamber and are evenly distributed on the inner wall of the stirring chamber, allowing the atomized water to fully contact and uniformly mix with the slurry, avoiding local moisture content being too high or too low, and the protective cover can protect the variable frequency water pump and the flow metering valve. The heat dissipation screen ensures stable operation of the pumping part, thereby improving the reliability and uniformity of the moisture content compensation.

[0007] Further, the top surface of the concrete mixer is embedded with a feeding hopper, which is located directly below the discharge end of the inclined conveying belt, and a plate valve is connected between the feeding hopper and the concrete mixer. The feeding hopper is located directly below the discharge end of the inclined conveying belt, which can ensure that the aggregates conveyed by the inclined conveying belt fall accurately into the feeding hopper, avoiding waste caused by aggregate spilling. The plate valve between the feeding hopper and the concrete mixer can control the speed and amount of aggregates entering the mixing chamber, allowing aggregates and other raw materials to be mixed in an orderly manner according to the designed ratio, laying a foundation for subsequent accurate compensation of water content and ensuring the quality of concrete mixing.

[0008] Further, the water storage tank is provided with a heater and a liquid level sensor. The heater is provided with a temperature controller, and the liquid level sensor can monitor the water level in the water storage tank in real time and feedback water shortage information in time to avoid interruption of water replenishment due to water shortage and ensure production continuity. The heater cooperates with the temperature controller to adjust the temperature of the clean water in the water storage tank according to the environmental temperature and production demand, so that the water replenishment temperature is compatible with the slurry temperature, avoiding the influence of excessively high or low water temperature on the mixing effect of concrete, and further ensuring the strength and durability of the prefabricated component.

[0009] Further, the compensation model is constructed based on a multiple linear regression and BP neural network fusion algorithm. The input parameters include real-time water content of aggregates, real-time humidity of slurry, designed water-binder ratio, aggregate bulk density, and environmental temperature and humidity. The output parameter is real-time water replenishment amount. The compensation model fuses multiple linear regression and BP neural network algorithms, can comprehensively consider multiple key influencing factors such as real-time water content of aggregates and real-time humidity of slurry, has stronger processing capacity for complex data compared with a single algorithm, and has more accurate calculation results. By comprehensively including various parameters affecting water content, it can avoid calculation deviation of water replenishment amount caused by single parameter consideration, ensure high matching between real-time water replenishment amount and actual demand, and further ensure the stability of concrete mixing quality.

[0010] Further, the preset data includes but is not limited to inputting the strength grade of the prefabricated component, the type of aggregates, the designed water-binder ratio, and the environmental temperature and humidity parameters. The preset data covers key production parameters such as the strength grade of the prefabricated component and the type of aggregates, provides a basis for calculation for the compensation model, and enables the compensation model to calculate the water replenishment amount in combination with specific production requirements and raw material characteristics. Different strength grades of prefabricated components and types of aggregates have different requirements for water content. By inputting these preset data, personalized adaptation of water replenishment amount can be realized, avoiding mixing quality problems caused by uniform water replenishment standards, and ensuring the production quality of prefabricated components of different specifications.

[0011] Further, the honey device and the storage are also included, and the honey device, the storage and the PLC controller are electrically connected. The honey device is electrically connected with the PLC controller, and can timely alarm when the water content of the aggregate or the slurry humidity abnormally fluctuates, so as to remind the operator to check the problem and avoid the unqualified slurry into the subsequent production link, thereby guaranteeing the product quality. The storage can automatically record various key data in the production process, thereby providing the basis for production quality traceability, facilitating the operator to analyze the problems in the production process, optimizing the production process and improving the production stability.

[0012] A use method of a prefabricated component concrete mixing water content compensation device, comprising the following steps: S1: inputting prefabricated initialization parameters through the parameter input module, including component strength grade, aggregate type, design water-binder ratio, target mixing material humidity range and environmental temperature and humidity data; S2: starting the inclined conveying belt, the microwave array sensor performing non-contact water content detection on the aggregate in the conveying process, the temperature compensation circuit correcting the influence of the environmental temperature, and the average real-time water content of the aggregate being conveyed to the PLC controller; S3: inputting the aggregate, cement, additive and basic water amount into the concrete mixer according to the design ratio, and starting the mixing operation, the optical fiber humidity sensor collecting the real-time slurry humidity data and transmitting the data to the PLC controller; S4: the compensation model combining the average real-time water content of the aggregate, the slurry humidity and the initialization parameters, calculating the real-time water supplement amount through a fusion algorithm, and the formula being: wherein, is the real-time water supplement amount, is the aggregate water content correction coefficient, is the optimal water content of the aggregate, is the real-time water content of the aggregate, is the total mass of the aggregate, is the slurry humidity compensation coefficient, is the target slurry humidity, is the real-time slurry humidity, is the current mixing material volume; S5: the PLC controller sending a control signal to the variable frequency water pump and the flow metering valve according to the obtained real-time water supplement amount, the variable frequency water pump adjusting the water supply pressure, the flow metering valve controlling the water flow, so that the water is pumped into the atomizing nozzle, the water is atomized by the atomizing nozzle and sprayed into the mixing chamber of the concrete mixer, and the optical fiber humidity sensor continuously monitors the slurry humidity during the water supplement process; S6: when the slurry humidity reaches the target range and is stable for 30 seconds, the water supplement is stopped, and the mixing is continued for 2-3 minutes; if the humidity does not meet the requirements, the steps S4-S5 are repeated for secondary compensation until the requirements are met; S7: The storage automatically records the water content change curve of the aggregate of this production, the water supplement data, the slurry humidity curve and the production batch information.

[0013] Further, in the step S4, the aggregate water content correction coefficient According to the type of aggregate, dynamically adjust: gravel aggregate Take 1.05-1.10, pebble aggregate Take 1.02-1.05, machine-made sand aggregate Take 1.10-1.15.

[0014] Further, in the step S5, the spray direction of the atomizing nozzle is at an angle of 45° with the rotating direction of the stirring blade of the concrete mixer.

[0015] Compared with the prior art, the precast component concrete mixing water content compensation device and the use method thereof have the beneficial effects that: the microwave array type sensor cooperates with the temperature compensation circuit to solve the problems of detection lag of the traditional drying method and large error of the resistance type sensor, can realize real-time and accurate acquisition of the aggregate water content; the optical fiber humidity sensor realizes real-time monitoring of the slurry humidity to provide dynamic data for water supplement calculation; the compensation model is based on the fusion algorithm of multiple linear regression and BP neural network, calculates the water supplement amount by comprehensively considering multiple key parameters, replaces the experience estimation, and avoids the problem of large deviation of the water supplement amount; the frequency conversion water pump, the flow metering valve and the atomizing nozzle cooperate to realize accurate and uniform water supplement; the honey device and the storage ensure the stability and traceability of the production process. Through the synergistic effect of these components, the concrete water content fluctuation is effectively controlled, the strength variation coefficient of the precast component is reduced, the problems of shrinkage cracking and insufficient strength caused by too high water content, and the problems of dry and not dense mixing material and not dense vibration caused by too low water content are solved, and the stability of the production quality of the precast component is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a first three-dimensional structure schematic diagram of the precast component concrete mixing water content compensation device disclosed in the embodiment of the application. Figure 2 It is a second three-dimensional structure schematic diagram of the precast component concrete mixing water content compensation device disclosed in the embodiment of the application. Figure 3 It is a cross-sectional structure schematic diagram of the precast component concrete mixing water content compensation device disclosed in the embodiment of the application. Figure 4 It is a system block diagram of the precast component concrete mixing water content compensation device disclosed in the embodiment of the application. Figure 5 It is a flowchart of the use method of the precast component concrete mixing water content compensation device disclosed in the embodiment of the application.

[0017] In the figure: 1, concrete mixer; 2, feed hopper; 3, inclined conveyor belt; 4, mounting frame; 5, water storage tank; 6, protective cover; 7, second conduit; 8, control room; 9, microwave array sensor; 10, temperature compensation circuit; 11, optical fiber humidity sensor; 12, atomizing nozzle; 13, pipeline. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0019] Please refer to Figures 1-4The application provides a technical scheme: a prefabricated component concrete mixing water content compensation device, which comprises a concrete mixer 1, an inclined conveying belt 3, a water storage tank 5 and a control room 8, a plurality of optical fiber humidity sensors 11 are uniformly distributed on the inner wall of the stirring cavity of the concrete mixer 1 in a circumferential direction, the inclined conveying belt 3 conveys gravel into the concrete mixer 1, the inclined conveying belt 3 is provided with a plurality of mounting racks 4, and the mounting racks 4 are arranged along the conveying direction of the inclined conveying belt 3, a microwave array type sensor 9 and a temperature compensation circuit 10 are mounted on the bottom surface of the mounting rack 4, the microwave array type sensor 9 and the temperature compensation circuit 10 are located directly above the belt of the inclined conveying belt 3, clean water is stored in the water storage tank 5, a pumping part is mounted on the top surface of the water storage tank 5, the pumping part pumps the clean water into the stirring cavity of the concrete mixer 1, a PLC controller, a parameter input module and an algorithm processing unit are arranged in the control room 8, the PLC controller is electrically connected with the microwave array type sensor 9, the temperature compensation circuit 10 and the optical fiber humidity sensor 11, the parameter input module is used for inputting preset data to the PLC controller, the algorithm processing unit intercommunicates data with the PLC controller, the algorithm processing unit is provided with a compensation model, the compensation model is used for dynamically calculating an optimal water compensation amount, the preset data is inputted to the PLC controller through the parameter input module, then the inclined conveying belt 3 is started to convey the aggregate, the microwave array type sensor 9 on the mounting rack 4 detects the water content of the conveying aggregate, the temperature compensation circuit 10 synchronously corrects the detection deviation caused by the ambient temperature, and the real-time average water content of the processed aggregate is transmitted to the PLC controller; when the concrete mixer 1 works, the optical fiber humidity sensor 11 collects the humidity data of the slurry in the stirring cavity and sends the data to the PLC controller; the PLC controller transmits the received data to the algorithm processing unit, the algorithm processing unit calculates the optimal water compensation amount through the built-in compensation model and feeds back the optimal water compensation amount to the PLC controller, and then the PLC controller controls the pumping part to pump the clean water in the water storage tank 5 into the stirring cavity of the concrete mixer 1, so that the water content compensation is completed.

[0020] Specifically, the sensor spacing of the microwave array type sensor 9 is 15cm-20cm, the detection depth is 3cm-5cm, the measurement accuracy is less than or equal to ±0.3%, and the sampling frequency is 5Hz; the compensation range of the temperature compensation circuit 10 is -10℃-45℃; the measurement range of the optical fiber humidity sensor 11 is 0RH-100%RH, the measurement accuracy is less than or equal to ±1%RH, the response time is less than or equal to 0.5s, and the sensor probe of the optical fiber humidity sensor 11 is provided with a polytetrafluoroethylene protective layer and is resistant to concrete corrosion.

[0021] As an embodiment of the present application, further, the pumping member comprises a protective cover 6 mounted on the top surface of the water storage tank 5, a variable frequency water pump and a flow metering valve are mounted in the protective cover 6, the output end of the variable frequency water pump and one end of the flow metering valve are communicated, the input end of the variable frequency water pump and the water storage tank 5 are communicated through a first conduit, the other end of the flow metering valve and the concrete mixer 1 are communicated through a second conduit 7, a plurality of atomizing nozzles 12 are uniformly distributed on the inner wall of the mixing chamber of the concrete mixer 1 in a circumferential direction, a pipeline 13 is connected between the atomizing nozzles 12, the second conduit 7 and the pipeline 13 are communicated, and a heat dissipation filter screen is embedded in the side surface of the protective cover 6; the PLC controller sends a control signal to the variable frequency water pump and the flow metering valve according to the optimal water supplement amount, the water supply pressure is first adjusted by the variable frequency water pump to a suitable range, and then the flow metering valve accurately controls the water flow, the clean water is pumped out from the water storage tank 5 through the first conduit, conveyed to the pipeline 13 through the variable frequency water pump, the flow metering valve and the second conduit 7, and then distributed to each atomizing nozzle 12 through the pipeline 13, and the atomizing nozzle 12 sprays the clean water mist to the slurry in the mixing chamber, so that uniform water supplement is realized; the protective cover 6 prevents foreign matters from contacting the variable frequency water pump and the flow metering valve, and the heat dissipation filter screen on the side surface helps the equipment to dissipate the heat generated during work, so that the normal working temperature of the equipment is maintained.

[0022] Specifically, the measurement accuracy of the flow metering valve is less than or equal to ±0.5%, the atomizing particle size of the atomizing nozzle 12 is 50-100 μm, the water supply pressure adjustment range of the variable frequency water pump is 0.3-1.2 MPa, and the continuous adjustable support water supplement amount is 0-50 L / min.

[0023] As an embodiment of the present application, further, the top surface of the concrete mixer 1 is embedded with a feeding hopper 2, the feeding hopper 2 is located directly below the discharging end of the inclined conveying belt 3, and a plate valve is communicated between the feeding hopper 2 and the concrete mixer 1; the preset data is input through the parameter input module, and then the inclined conveying belt 3 is started to convey the aggregate, the aggregate falls from the discharging end of the inclined conveying belt 3, and directly falls into the feeding hopper 2 because the feeding hopper 2 is directly below the discharging end; according to the progress of the concrete mixing and the design ratio, the opening degree of the plate valve between the feeding hopper 2 and the concrete mixer 1 is controlled, the rate and total amount of the aggregate entering the mixing chamber are adjusted, the aggregate, the cement, the additive and the basic water amount which are subsequently put in are mixed in the mixing chamber according to the proportion, and good conditions are created for the mixing operation and the moisture content detection.

[0024] As an embodiment of the present application, further, a heater and a liquid level sensor are installed in the water storage tank 5, the heater has a temperature controller, the liquid level sensor continuously monitors the water level in the water storage tank 5 during the entire water content compensation process, and transmits the water level data to the PLC controller, when the water level is lower than the preset threshold, the PLC controller sends a prompt signal to remind the operator to add water in time; when the ambient temperature is low or the production process has specific requirements for water temperature, the temperature controller controls the heater to work according to the preset temperature value, and heats the clean water in the water storage tank 5, when the water temperature reaches the preset value, the temperature controller controls the heater to stop heating, and after ensuring that the clean water temperature meets the production demand, it is transported to the stirring cavity through the pumping part.

[0025] As an embodiment of the present application, further, the compensation model is constructed based on a multiple linear regression and BP neural network fusion algorithm, the input parameters include real-time water content of aggregate, real-time humidity of slurry, design water-binder ratio, aggregate bulk density, and environmental temperature and humidity, and the output parameter is real-time water supplement amount, first, the parameter input module inputs the initial parameters such as the design water-binder ratio, the aggregate bulk density, and the environmental temperature and humidity, the microwave array sensor 9 and the temperature compensation circuit 10 provide real-time water content data of aggregate, and the optical fiber humidity sensor 11 provides real-time humidity data of slurry, which are collectively used as input data of the compensation model; then, the multiple linear regression algorithm linearly fits the input parameters, and preliminarily establishes a linear relationship between the parameters and the real-time water supplement amount, and the BP neural network algorithm non-linearly maps the input parameters to mine the complex correlation between the parameters; then, the model fuses the processing results of the two algorithms, iteratively optimizes the data, and finally calculates the accurate real-time water supplement amount and outputs it to the PLC controller, thereby providing data support for water supplement operation.

[0026] As an embodiment of the present application, further, the preset data includes but is not limited to the precast component strength grade, the aggregate type, the design water-binder ratio, and the environmental temperature and humidity parameters, before the production operation starts, the operator inputs the precast component strength grade, the aggregate type, the design water-binder ratio, and the environmental temperature and humidity parameters into the PLC controller through the parameter input module; the PLC controller transmits these preset data to the algorithm processing unit, which uses them as basic input parameters of the compensation model, and combines them with dynamic data such as real-time water content of aggregate and real-time humidity of slurry collected subsequently, so that the compensation model fully considers the production demand and environmental conditions when calculating the real-time water supplement amount, and ensures that the water supplement amount calculation meets the specific production scene.

[0027] As an embodiment of the present application, further comprising a honey device and a storage, the honey device, the storage and the PLC controller are electrically connected, during the production process, the PLC controller receives the aggregate moisture content and the slurry humidity data in real time, when it is detected that the aggregate moisture content fluctuation exceeds ±2% or the slurry humidity deviates from the target range ±5%RH, the PLC controller sends an alarm signal to the honey device, and the honey device starts the alarm prompt; at the same time, the storage and the PLC controller communicate synchronously, and automatically record the aggregate moisture content change curve, the water supplement data, the slurry humidity curve and the production batch information of this production, these data are stored for subsequent inquiry and analysis, and support is provided for production process optimization and quality traceability.

[0028] Specifically, when the aggregate moisture content fluctuation exceeds ±2% or the slurry humidity deviates from the target range ±5%RH, the honey device alarms.

[0029] On the other hand, referring to Figure 5 , the present application provides a technical solution: a use method of a prefabricated component concrete mixing moisture content compensation device, comprising the following steps: S1: inputting prefabricated initialization parameters through a parameter input module, including component strength grade, aggregate type, design water-binder ratio, target mixing material humidity range and environmental temperature and humidity data; S2: starting the inclined conveyor belt 3, the microwave array type sensor 9 detects the non-contact moisture content of the aggregate in the conveying process, the temperature compensation circuit 10 corrects the influence of the environmental temperature, and the real-time average moisture content of the aggregate is conveyed to the PLC controller; S3: according to the design ratio, the aggregate, cement, additive and basic water amount are put into the concrete mixer 1, and the mixing operation is started, the optical fiber humidity sensor 11 collects the slurry humidity data in real time and transmits it to the PLC controller; S4: the compensation model combines the real-time average moisture content of the aggregate, the slurry humidity and the initialization parameters, and calculates the real-time water supplement amount through a fusion algorithm, the formula is: , wherein, is the real-time water supplement amount, is the aggregate moisture content correction coefficient, is the optimal aggregate moisture content, is the real-time aggregate moisture content, is the total mass of the aggregate, is the slurry humidity compensation coefficient, is the target slurry humidity, is the real-time slurry humidity, is the current mixing material volume; S5: The PLC controller sends control signals to the frequency conversion water pump and the flow metering valve according to the obtained real-time water supplement amount, the frequency conversion water pump adjusts the water supply pressure, and the flow metering valve controls the water flow, so as to pump the clean water into the atomizing nozzle 12, the atomizing nozzle 12 sprays the water mist into the mixing chamber of the concrete mixer 1 after atomizing, and the optical fiber humidity sensor 11 continuously monitors the slurry humidity during the water supplement process; S6: When the slurry humidity reaches the target range and is stable for 30s, the water supplement is stopped, and the stirring is continued for 2-3min; if the humidity does not meet the requirement, the secondary compensation is repeated through steps S4-S5 until the requirement is met. S7: The storage automatically records the aggregate water content change curve, the water supplement amount data, the slurry humidity curve and the production batch information of this production.

[0030] As an embodiment of the present application, further, in step S4, the aggregate water content correction coefficient According to the type of aggregate, the value is 1.05-1.10 for gravel aggregate. The value is 1.02-1.05 for pebble aggregate. The value is 1.10-1.15 for machine-made sand aggregate. The value is 1.10-1.15.

[0031] As an embodiment of the present application, further, in step S5, the spray direction of the atomizing nozzle 12 forms a 45° angle with the rotating direction of the stirring blade of the concrete mixer 1.

[0032] It should be noted that the standard parts used in the present application can be purchased from the market, and can be customized according to the description and drawings, and the specific connection mode of each part adopts the conventional screw, rivet, welding and other conventional means in the prior art, the mechanical parts and equipment adopt the conventional type in the prior art, the control mode is automatically controlled through the control cabinet, the control circuit can be realized through simple programming by the person skilled in the art, which belongs to the common knowledge in the art, and the present application is mainly used to protect the mechanical device, so the control mode and circuit connection will not be explained in detail.

Claims

1. A device for compensating the moisture content of precast concrete mixing, characterized in that, The system includes a concrete mixer (1), an inclined conveyor belt (3), a water tank (5), and a control room (8). Several fiber optic humidity sensors (11) are evenly distributed circumferentially on the inner wall of the mixing chamber of the concrete mixer (1). The inclined conveyor belt (3) transports sand and gravel into the concrete mixer (1). The inclined conveyor belt (3) has several mounting frames (4), and these mounting frames (4) are arranged along the conveying direction of the inclined conveyor belt (3). A microwave array sensor (9) and a temperature compensation circuit (10) are mounted on the bottom surface of each mounting frame (4). The microwave array sensor (9) and the temperature compensation circuit (10) are located on the inclined conveyor belt. 3) Above the belt, the water storage tank (5) contains clean water. A pump is installed on the top surface of the water storage tank (5). The pump pumps the clean water into the mixing chamber of the concrete mixer (1). The control room (8) is equipped with a PLC controller, a parameter input module and an algorithm processing unit. The PLC controller is electrically connected to the microwave array sensor (9), the temperature compensation circuit (10) and the fiber optic humidity sensor (11). The parameter input module is used to transmit preset data to the PLC controller. The algorithm processing unit communicates data with the PLC controller. The algorithm processing unit has a built-in compensation model. The compensation model is used to dynamically calculate the optimal water replenishment amount.

2. The precast concrete mixing moisture content compensation device according to claim 1, characterized in that, The pumping component includes a protective cover (6) installed on the top surface of the water storage tank (5). A variable frequency water pump and a flow metering valve are installed inside the protective cover (6). The output end of the variable frequency water pump is connected to one end of the flow metering valve. A first conduit is connected between the input end of the variable frequency water pump and the water storage tank (5). A second conduit (7) is connected between the other end of the flow metering valve and the concrete mixer (1). Several atomizing nozzles (12) are evenly distributed circumferentially on the inner wall of the mixing chamber of the concrete mixer (1). Pipes (13) are connected between the atomizing nozzles (12). The second conduit (7) and the pipe (13) are connected. A heat dissipation filter is embedded on the side of the protective cover (6).

3. The precast concrete mixing moisture content compensation device according to claim 1, characterized in that, The concrete mixer (1) has a feed hopper (2) embedded on its top surface. The feed hopper (2) is located directly below the discharge end of the inclined conveyor belt (3). A plate valve connects the feed hopper (2) and the concrete mixer (1).

4. The precast concrete mixing moisture content compensation device according to claim 1, characterized in that, The water storage tank (5) is equipped with a heater and a liquid level sensor, and the heater has a temperature controller.

5. A precast concrete mixing moisture content compensation device according to claim 1, characterized in that, The compensation model is constructed based on a fusion algorithm of multiple linear regression and BP neural network. The input parameters include the real-time moisture content of aggregate, the real-time humidity of slurry, the design water-cement ratio, the bulk density of aggregate, and the ambient temperature and humidity. The output parameter is the real-time water replenishment amount.

6. The precast concrete mixing moisture content compensation device according to claim 1, characterized in that, The preset data includes, but is not limited to, the strength grade of the precast components, aggregate type, design water-cement ratio, and environmental temperature and humidity parameters.

7. A precast concrete mixing moisture content compensation device according to claim 1, characterized in that, It also includes a honey maker and a storage unit, which are electrically connected to a PLC controller.

8. A method of using a precast concrete mixing moisture content compensation device, as described in any one or more of the precast concrete mixing moisture content compensation devices according to claims 1-6, characterized in that, Includes the following steps: S1: Input the prefabrication initialization parameters through the parameter input module, including component strength grade, aggregate type, design water-cement ratio, target mix moisture range and ambient temperature and humidity data; S2: Start the inclined conveyor belt (3), the microwave array sensor (9) performs non-contact moisture content detection on the aggregate during the conveying process, the temperature compensation circuit (10) corrects the influence of ambient temperature, and transmits the real-time average moisture content of the aggregate to the PLC controller. S3: Add aggregate, cement, admixture and basic water to the concrete mixer (1) according to the design ratio, and start the mixing operation. The fiber optic humidity sensor (11) collects the slurry humidity data in real time and transmits it to the PLC controller. S4: The compensation model combines the real-time average moisture content of the aggregate, the slurry moisture content, and initial parameters to calculate the real-time water replenishment amount using a fusion algorithm. The formula is as follows: ,in, To ensure real-time water replenishment, This is the correction factor for aggregate moisture content. For the optimal moisture content of the aggregate, This refers to the real-time moisture content of the aggregate. For the total mass of aggregate, This is the slurry moisture compensation coefficient. To determine the target slurry moisture content, For real-time slurry moisture content, This represents the current volume of the mixed material; S5: The PLC controller sends control signals to the variable frequency water pump and the flow metering valve according to the real-time water replenishment amount. The variable frequency water pump adjusts the water supply pressure, and the flow metering valve controls the water flow, thereby pumping clean water to the atomizing nozzle (12). The atomizing nozzle (12) atomizes the water and sprays it into the mixing chamber of the concrete mixer (1). During the water replenishment process, the fiber optic humidity sensor (11) continuously monitors the slurry humidity. S6: When the slurry moisture reaches the target range and stabilizes for 30 seconds, stop adding water and continue stirring for 2-3 minutes; if the moisture does not meet the standard, repeat steps S4-S5 for secondary compensation until the requirements are met; S7: The storage device automatically records the aggregate moisture content change curve, water replenishment data, slurry humidity curve and production batch information for this production.

9. The method of using the precast concrete mixing moisture content compensation device according to claim 8, characterized in that, In step S4, the aggregate moisture content correction factor Dynamically adjusted based on aggregate type: Crushed stone aggregate Values ​​range from 1.05 to 1.10 for pebble aggregate. Values ​​range from 1.02 to 1.05 for manufactured sand aggregate. The value ranges from 1.10 to 1.

15.

10. The method of using the precast concrete mixing moisture content compensation device according to claim 8, characterized in that, In step S5, the spray direction of the atomizing nozzle (12) is at a 45° angle to the rotation direction of the mixing blades of the concrete mixer (1).

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