Concrete mixing device with intelligent proportioning function and mixing method

Abstract

The application provides a concrete mixing device with intelligent proportioning function and a mixing method, and relates to the technical field of material mixing. The device comprises a raw material storage bin system, a real-time detector, an intelligent proportioning control unit, an automatic metering and feeding system, a double-shaft forced stirring drum and a process monitoring and feedback system. The raw material state is collected online by a microwave water content detector, a water quality sensor and the like, the dynamic optimization of the mixing proportion is utilized in combination with environmental parameters and target performance requirements, and the component feeding amount is accurately controlled. During the stirring process, the mixing uniformity is judged in real time based on the torque change, and closed-loop regulation is realized. The device is provided with a rotary scraper arch breaking mechanism, a three-point suspension weighing hopper, a hydraulic slide plate discharge door and a high-pressure automatic cleaning system, which effectively prevent blockage. The application significantly improves the concrete quality stability and the intelligent production level, and is suitable for various scenes such as commercial concrete stations, prefabricated component plants and construction sites.

Description

Technical Field

[0001] This invention relates to the field of material mixing technology, and more specifically, to a concrete mixing device and mixing method with intelligent proportioning function. Background Technology

[0002] As one of the most important structural materials in modern construction engineering, concrete's performance directly affects the safety, durability, and economy of a project. Traditional concrete production relies heavily on fixed mix proportions and manual experience. Fluctuations in raw material quality, such as changes in aggregate moisture content, powder agglomeration, and differences in environmental conditions (temperature, humidity, etc.), can easily lead to deviations in the actual mixture's performance from design requirements. This can result in problems such as unstable slump, insufficient strength, or segregation and bleeding, severely impacting construction quality.

[0003] Most common concrete mixing equipment currently uses preset proportions for metering and feeding, lacking the ability to sense the real-time status of raw materials. For example, the moisture content of sand and gravel varies significantly with weather and storage time. If the water content is not adjusted in time, the water-cement ratio will become out of control, thus affecting the development of concrete strength. In addition, powdery materials such as cement are prone to bridging and clumping during storage, leading to poor discharge or even blockage, affecting the efficiency of continuous operation.

[0004] Although some intelligent mixing systems have attempted to incorporate automatic weighing and PLC control, the following technical bottlenecks still exist:

[0005] The detection methods are limited: most systems rely solely on manual sampling to determine moisture content, making it impossible to achieve continuous online monitoring;

[0006] Lagging ratio adjustment: Ratio optimization relies on laboratory trial results and is difficult to respond to dynamic changes on site;

[0007] Poor adaptability of mechanical structure: The powder silo lacks an effective arch-breaking mechanism, and the screw conveyor is prone to jamming; the weighing system has weak anti-interference ability, and its accuracy is greatly affected by vibration;

[0008] Lack of process control: The mixing process lacks criteria for judging uniformity, and mixing is often stopped at a fixed time, which may lead to under-mixing or over-mixing.

[0009] High maintenance costs: The mixing blades are severely worn and difficult to replace, and the poor sealing of the discharge gate causes slurry leakage and pollution.

[0010] Therefore, existing technologies are insufficient to meet the urgent needs of modern engineering construction for high-quality, high-efficiency, and intelligent concrete production. There is an urgent need for a new type of concrete mixing device that integrates real-time sensing, dynamic proportioning, precise metering, efficient mixing, and closed-loop feedback to solve the above problems and improve the automation level and quality stability of concrete production. Therefore, we have made improvements and proposed a concrete mixing device and mixing method with intelligent proportioning function. Summary of the Invention

[0011] The purpose of this invention is to address the problems raised in the existing background technology. To achieve the above-mentioned objective, this invention provides the following technical solution: a concrete mixing device with intelligent proportioning function, comprising raw material storage bins for storing cement, fine aggregate, coarse aggregate, water, and admixtures respectively; each bin is equipped with an electronic weighing sensor and a controllable discharge valve at its bottom.

[0012] Real-time detectors are used to detect aggregate moisture content, water quality parameters, and powder flowability online.

[0013] The intelligent mix proportioning control unit is connected to the real-time detector and the electronic weighing sensor, and is used to dynamically calculate the optimal mix proportion based on the detection data and the preset concrete performance target.

[0014] An automatic metering and feeding system is used to precisely control the amount of each component fed according to the instructions output by the intelligent proportioning control unit.

[0015] The main mixing drum is equipped with a dual-shaft forced mixing mechanism and a speed-adjustable drive motor;

[0016] A mixing process monitoring and feedback system is used to collect torque, current or vibration signals during the mixing process to evaluate the mixing uniformity and feed the data back to the intelligent proportioning control unit; a human-machine interface and a remote communicator are used for parameter input, status display and remote data transmission;

[0017] The automatic metering and feeding system includes a multi-stage buffer weighing hopper, a screw conveyor mechanism, and a pneumatic arch-breaking mechanism, achieving high-precision, residue-free feeding.

[0018] As a preferred technical solution of the present invention, a conical arch-breaking bin head is provided below the discharge port of the cement bin and the fly ash bin, and a rotating scraper assembly is integrated inside. The rotating scraper is driven by a servo motor with a rotation speed of 10~30 rpm. The scraper blades are spirally distributed to prevent powder bridging or clumping.

[0019] The shaft end of the rotating scraper extends to the outside and is connected to a vibration sensor. When a sudden increase in torque is detected that exceeds the threshold, it automatically starts to rotate in the opposite direction and links with a pneumatic arch-breaking hammer to perform pulse impact to clear the blockage.

[0020] As a preferred technical solution of the present invention, the weighing mechanism in the automatic metering and feeding system adopts a three-point suspension weighing structure. Each weighing hopper is suspended on the support frame by three high-precision strain sensors. The sensors are evenly distributed at 120° and are equipped with a horizontal adjustment mechanism and an anti-eccentricity guide rod.

[0021] The weighing sensor has a resolution of 0.1 kg and a nonlinear error of ≤0.05%FS. The signal is transmitted to the intelligent proportioning control unit via a shielded cable for dynamic compensation processing.

[0022] As a preferred technical solution of the present invention, the fine aggregate and coarse aggregate are fed into the buffer weighing hopper by a belt conveyor and then pass through a vibrating screening mechanism. The vibrating screening mechanism includes upper and lower double-layer screens, with an upper layer aperture of 37.5 mm and a lower layer aperture of 4.75 mm. The screen body is driven by a double eccentric shaft vibrator with a vibration frequency of 15~25 Hz, which is used to remove oversized materials and soil lumps.

[0023] After screening, qualified aggregates fall into the weighing hopper, while unqualified materials are discharged from the side slag discharge port and trigger an alarm.

[0024] As a preferred technical solution of the present invention, the main stirring drum is provided with two parallel stirring shafts, each stirring shaft is equipped with multiple sets of stirring arms, the stirring arms are arranged in a spiral staggered manner, and the ends are welded with detachable wear-resistant stirring blades.

[0025] The stirring blade has a trapezoidal cross-section structure, and the surface is overlaid with a tungsten carbide alloy layer with a thickness of ≥3 mm. It is connected to the stirring arm by high-strength T-bolts for easy replacement.

[0026] The two stirring shafts are driven by a synchronous gearbox to ensure consistent rotation speed and avoid interference.

[0027] As a preferred technical solution of the present invention, the feed inlet of the main mixing drum is located on the top side, and the discharge door is located at the bottom center. The discharge door is a hydraulically driven sliding plate structure, including a fixed door frame and a stainless steel sliding plate that can move laterally. Elastic sealing strips are provided on both sides of the sliding plate, which fit tightly with the door frame in the closed state to prevent slurry leakage.

[0028] The hydraulic cylinder is equipped with a position sensor that provides real-time feedback on the opening and closing status to the control unit, ensuring that it can only be opened after stirring has stopped and the pressure has returned to zero.

[0029] As a preferred technical solution of the present invention, the aggregate moisture content detector in the real-time detector adopts a microwave transmission sensor, which is installed above the aggregate conveyor belt with the transmitting end and receiving end symmetrically arranged, and measures the attenuation of the microwave signal to estimate the moisture content. The calculation formula is as follows:

[0030] ;

[0031] in, The microwave power is for dry aggregate. To measure the transmitted power, These are empirical coefficients determined based on calibration experiments; the system samples every 30 seconds and uses the moving average as the current input.

[0032] As a preferred technical solution of the present invention, the intelligent proportioning control unit has a built-in proportioning optimization algorithm that outputs a dynamic water-cement ratio. satisfy:

[0033] ;

[0034] in, This is the theoretical water-to-binder ratio. Standard moisture content, This is a moisture content correction factor (0.005~0.015). This is the temperature compensation coefficient (-0.001~0.003 / °C). The ambient temperature (°C) is used to adjust the water consumption and admixture dosage in real time.

[0035] A mixing method for a concrete mixing device with intelligent proportioning function includes the following steps:

[0036] S1: Input the target concrete performance parameters, including the design strength grade. slump and the conditions of use;

[0037] S2: Activate the real-time detector to obtain aggregate moisture content. Water quality indicators and powder condition information;

[0038] S3: The intelligent proportioning control unit combines measured data with the standard proportioning model and uses a neural network algorithm to analyze and dynamically optimize the proportioning.

[0039] S4: The automatic metering and feeding system feeds each component in sequence. The powder is fed at a uniform speed by a screw conveyor with frequency conversion control to avoid dust and impact errors.

[0040] S5: The main mixing drum starts at an initial speed of 45 rpm, and after running for 60 seconds, it is increased to 60 rpm for high-speed shear mixing;

[0041] S6: The mixing process monitoring system collects stirring torque in real time. ,when and If the mixing is maintained for more than 10 seconds, the mixing is considered complete; otherwise, closed-loop regulation is initiated.

[0042] S7: Open the hydraulic slide gate to discharge concrete and record the entire process data to be uploaded to the cloud.

[0043] As a preferred embodiment of the present invention, in step S6, if an abnormal increase in torque is detected, indicating that the slurry is too viscous, the control system automatically activates the micro-addition pump for the admixture, adding it in increments. Add high-performance water-reducing agent, among which This is a proportionality coefficient, with a value ranging from 0.02 to 0.05 g / (N·m). After adding the product, continue stirring for at least 30 seconds.

[0044] Meanwhile, the inner wall of the main mixing drum is equipped with a high-pressure water mist cleaning nozzle array, which automatically starts the cleaning program after each unloading to prevent residual concrete from hardening and affecting the accuracy of the next batching.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] This invention collects raw material state parameters in real time using a microwave moisture content meter and a water quality analyzer, and performs dynamic compensation in conjunction with ambient temperature and humidity. It also uses a neural network model to analyze the optimal mix ratio, effectively avoiding the problem of water-cement ratio runaway caused by raw material fluctuations, and ensuring that each batch of concrete meets the design strength and workability requirements.

[0047] This invention employs a three-point suspension weighing structure combined with a high-precision strain sensor (resolution 0.1 kg), along with a variable frequency screw conveyor and pneumatic arch breaking mechanism, to ensure that the addition error of each component such as cement, aggregate, and admixture is ≤0.5%, eliminating human error and improving production consistency.

[0048] The cement silo and admixture silo of this invention are equipped with a dual unblocking mechanism consisting of a rotating scraper assembly and a pneumatic arch-breaking hammer. When the torque sensor detects an increase in discharge resistance, it automatically starts reverse rotation and pulse impact to completely eliminate bridging, ensure continuous and stable material supply, and improve the reliability of equipment operation.

[0049] The main mixing drum of this invention adopts a dual-shaft forced structure with staggered spiral mixing arms and detachable tungsten carbide wear-resistant blades at the ends, providing strong shearing force and thorough mixing. A synchronous gearbox drive ensures consistent rotational speeds between the two shafts, preventing interference and wear. Combined with a staged speed control strategy (low-speed premixing + high-speed shearing), mixing time is shortened, improving energy efficiency.

[0050] This invention introduces a stirring process monitoring and feedback system based on the torque change rate. The system determines the timing of mixing completion based on steady-state deviation, breaking through the limitations of traditional timed stirring. When the slurry is detected to be too viscous, it automatically adds a small amount of water-reducing agent and extends the stirring time, forming a closed-loop control of perception, decision-making, execution, and feedback, thus comprehensively improving the level of intelligence.

[0051] The entire process is automated, reducing manual intervention; the hydraulic sliding unloading gate has a good seal and operates smoothly, preventing slurry leakage; the high-pressure water mist automatic cleaning system can quickly clean up residues after each unloading, preventing solidification and blockage, extending equipment life, and reducing maintenance frequency.

[0052] Equipped with a human-machine interface and a remote communicator, all production parameters, such as proportions, moisture content, mixing time, and energy consumption, are recorded in real time and uploaded to the cloud platform. This facilitates quality traceability, fault diagnosis, and model self-learning optimization, thus contributing to the construction of smart construction sites.

[0053] Optional solar power supply unit and rainwater recycling system can be equipped to reduce energy consumption and water waste; the whole machine has a compact structure and is suitable for large-scale production in commercial concrete plants, as well as mobile operation scenarios in precast component plants and field construction sites.

[0054] This invention not only solves the problems of rigid proportioning, inaccurate measurement, easy clogging, and uneven mixing in traditional concrete mixing equipment, but also builds a safe, reliable, efficient, intelligent, green and sustainable modern concrete production solution through collaborative innovation of software and hardware, which has outstanding practicality and broad prospects for promotion and application. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the structure provided by the present invention;

[0056] Figure 2 A schematic diagram of the stirring arm structure provided by the present invention;

[0057] Figure 3 This is a cross-sectional structural schematic diagram provided by the present invention;

[0058] Figure 4 This is a schematic diagram of the screen structure provided by the present invention;

[0059] Figure 5 This is a schematic diagram of the servo motor structure provided by the present invention.

[0060] The image shows:

[0061] 1. Raw material storage silo; 101. Cement silo; 102. Fly ash silo; 103. Conical arch-breaking silo head; 2. Real-time detector;

[0062] 3. Intelligent proportioning control unit; 301. Electronic weighing sensor; 4. Multi-stage buffer weighing hopper; 5. Screw conveyor mechanism; 6. Pneumatic arch-breaking mechanism;

[0063] 7. Rotary scraper assembly; 701. Servo motor; 702. Scraper blade; 703. Vibration sensor; 8. Strain sensor; 9. Anti-eccentric load guide rod; 10. Vibrating screening mechanism; 1001. Screen; 11. Main mixing drum; 1101. Mixing shaft; 1102. Mixing arm; 1103. Mixing blade; 12. Discharge gate; 13. Cleaning nozzle. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are specific implementations of the present invention and are not limited to all embodiments.

[0065] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0066] It should be noted that, in the absence of conflict, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other. It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0067] Example: A concrete mixing device with intelligent proportioning function includes a raw material storage bin 1 for storing cement, fine aggregate, coarse aggregate, water and admixtures respectively. Each bin is equipped with an electronic weighing sensor 301 and a controllable discharge valve at the bottom.

[0068] Real-time detector 2 is used for online detection of aggregate moisture content, water quality parameters, and powder flowability;

[0069] The intelligent mix proportioning control unit 3 is connected to the real-time detector 2 and the electronic weighing sensor 301 for dynamically calculating the optimal mix proportion based on the detection data and the preset concrete performance target.

[0070] The automatic metering and feeding system is used to precisely control the amount of each component fed according to the instructions output by the intelligent proportioning control unit 3;

[0071] The main mixing drum 11 is equipped with a dual-shaft forced mixing mechanism and a speed-adjustable drive motor;

[0072] A mixing process monitoring and feedback system is used to collect torque, current or vibration signals during the mixing process to evaluate the mixing uniformity and feed the data back to the intelligent proportioning control unit 3; a human-machine interface and a remote communicator are used for parameter input, status display and remote data transmission;

[0073] The automatic metering and feeding system includes a multi-stage buffer weighing hopper 4, a screw conveyor mechanism 5, and a pneumatic arch-breaking mechanism 6, which achieves high-precision and residue-free feeding.

[0074] like Figure 1 As shown, a conical arch-breaking head 103 is provided below the discharge port of cement silo 101 and fly ash silo 102, and a rotating scraper assembly 7 is integrated inside. Figure 3 and Figure 5 As shown, the rotary scraper is driven by a servo motor 701 with a rotation speed of 10~30 rpm, and the scraper blades 702 are spirally distributed to prevent powder bridging or clumping.

[0075] The shaft end of the rotating scraper extends to the outside and is connected to the vibration sensor 703. When a sudden increase in torque is detected that exceeds the threshold, it automatically starts to rotate in the opposite direction and links the pneumatic arch-breaking hammer to perform pulse impact to clear the blockage.

[0076] like Figure 4 As shown, the weighing mechanism in the automatic metering and feeding system adopts a three-point suspension weighing structure. Each weighing hopper is suspended on the support frame by three high-precision strain sensors 8. The sensors are evenly distributed at 120° and are equipped with a horizontal adjustment mechanism and an anti-eccentricity guide rod 9.

[0077] The weighing sensor has a resolution of 0.1 kg and a nonlinear error of ≤0.05%FS. The signal is transmitted to the intelligent proportioning control unit 3 via a shielded cable for dynamic compensation processing.

[0078] Before fine and coarse aggregates are fed into the buffer weighing hopper by a belt conveyor, they pass through a vibrating screening mechanism 10. The vibrating screening mechanism 10 includes upper and lower double-layer screens 1001, with an upper layer aperture of 37.5 mm and a lower layer aperture of 4.75 mm. The screen body is driven by a double eccentric shaft vibrator with a vibration frequency of 15~25 Hz, which is used to remove oversized materials and soil lumps.

[0079] After screening, qualified aggregates fall into the weighing hopper, while unqualified materials are discharged from the side slag discharge port and trigger an alarm.

[0080] like Figure 2 As shown, the main mixing drum 11 is provided with two parallel mixing shafts 1101. Each mixing shaft 1101 is equipped with multiple sets of mixing arms 1102. The mixing arms 1102 are arranged in a spiral staggered manner, and detachable wear-resistant mixing blades 1103 are welded to the end.

[0081] The stirring blade 1103 has a trapezoidal cross-section structure, and the surface is overlaid with a tungsten carbide alloy layer with a thickness of ≥3 mm. It is connected to the stirring arm 1102 by high-strength T-bolts for easy replacement.

[0082] The two stirring shafts 1101 are driven by a synchronous gearbox to ensure consistent speed and avoid interference.

[0083] The feed inlet of the main mixing drum 11 is located on the top side, and the discharge door 12 is located at the bottom center. The discharge door 12 is a hydraulically driven sliding plate structure, including a fixed door frame and a stainless steel sliding plate that can move laterally. The sliding plate is provided with elastic sealing strips on both sides, which fit tightly with the door frame in the closed state to prevent slurry leakage.

[0084] The hydraulic cylinder is equipped with a position sensor that provides real-time feedback on the opening and closing status to the control unit, ensuring that it can only be opened after stirring has stopped and the pressure has returned to zero.

[0085] The aggregate moisture content detector in real-time detector 2 uses a microwave transmission sensor, installed above the aggregate conveyor belt, with the transmitter and receiver symmetrically arranged. It measures the attenuation of the microwave signal to estimate the moisture content. The calculation formula is as follows:

[0086] ;

[0087] in, The microwave power is for dry aggregate. To measure the transmitted power, These are empirical coefficients determined based on calibration experiments; the system samples every 30 seconds and uses the moving average as the current input.

[0088] The intelligent proportioning control unit 3 has a built-in proportioning optimization algorithm that outputs a dynamic water-cement ratio. satisfy:

[0089] ;

[0090] in, This is the theoretical water-to-binder ratio. Standard moisture content, The moisture content correction factor is 0.005~0.015. The temperature compensation coefficient is -0.001 to 0.003 / °C. The ambient temperature is ℃; this formula is used to adjust the water consumption and admixture dosage in real time.

[0091] A mixing method for a concrete mixing device with intelligent proportioning function includes the following steps:

[0092] S1: Input the target concrete performance parameters, including the design strength grade. slump and the conditions of use;

[0093] S2: Activate real-time detector 2 to obtain aggregate moisture content. Water quality indicators and powder condition information;

[0094] S3: The intelligent proportioning control unit 3 combines measured data with the standard proportioning model and uses a neural network algorithm to analyze and dynamically optimize the proportioning.

[0095] S4: The automatic metering and feeding system feeds each component in sequence. The powder is fed at a uniform speed by a screw conveyor with frequency conversion control to avoid dust and impact errors.

[0096] S5: The main mixing drum 11 starts at an initial speed of 45 rpm, and after running for 60 seconds, it is increased to 60 rpm for high-speed shear mixing;

[0097] S6: The mixing process monitoring system collects stirring torque in real time. ,when and If the mixing is maintained for more than 10 seconds, the mixing is considered complete; otherwise, closed-loop regulation is initiated.

[0098] S7: Open the hydraulic slide gate 12 to output concrete and record the entire process data to be uploaded to the cloud.

[0099] In step S6, if an abnormal increase in torque is detected, indicating that the slurry is too viscous, the control system automatically activates the admixture micro-addition pump, adding the admixture in increments. Add high-performance water-reducing agent, among which This is a proportionality coefficient, with a value ranging from 0.02 to 0.05 g / (N·m). After adding the product, continue stirring for at least 30 seconds.

[0100] Meanwhile, the inner wall of the main mixing drum 11 is equipped with an array of high-pressure water mist cleaning nozzles 13. The cleaning program is automatically started after each unloading to prevent residual concrete from hardening and affecting the accuracy of the next batching.

[0101] Working principle: The concrete mixing device with intelligent proportioning function described in this invention integrates multi-source real-time detection, dynamic proportioning optimization algorithm, high-precision automatic metering system and dual-shaft forced mixing mechanism to achieve intelligent, precise and closed-loop control of the entire process from raw material input to finished concrete output.

[0102] Before work begins, all raw materials—cement, fly ash, fine aggregate, coarse aggregate, water, and admixtures—are stored in separate, sealed silos. Upon receiving a production order, the system first activates real-time detector 2.

[0103] Aggregate moisture content detection: When fine and coarse aggregates are transported via a belt conveyor, a microwave transmission sensor installed above emits high-frequency electromagnetic waves that penetrate the material layer, and the receiving end measures the degree of signal attenuation. According to the formula:

[0104] ;

[0105] The actual moisture content of the aggregate is calculated in real time and the data is uploaded to the intelligent proportioning control unit 3.

[0106] Water quality analysis: After undergoing multi-stage filtration, the water enters the water tank. A water quality analyzer at the outlet continuously monitors pH, conductivity, and suspended solids concentration. If the levels exceed the standards for concrete use, the system automatically switches to the purified water path or triggers an alarm to replace the water source.

[0107] Powder flowability monitoring: Vibration sensors 703 and torque feedback devices are installed at the bottom of cement and admixture silos to determine whether bridging or clumping occurs.

[0108] Intelligent proportioning dynamic analysis: After acquiring all measured parameters of raw materials, the intelligent proportioning control unit 3 combines the design strength level input by the user. Target collapse and ambient temperature and humidity It calls the built-in machine learning model to optimize the ratio.

[0109] This model, trained on a historical test database, uses a BP neural network structure to predict 28-day compressive strength.

[0110] ;

[0111] Detailed explanation of each symbol: This refers to the model's predicted 28-day compressive strength of the concrete (usually in MPa). This is the final output of the neural network, used to evaluate whether the current mix proportion meets the user-defined design strength grade. . The activation function of the output layer is a linear function, but in regression tasks such as intensity prediction, a linear function is often used to map the weighted output of the hidden layer to the final intensity prediction value. The purpose is to sum the results of all n neurons in the hidden layer.

[0112] For: the activation function of the hidden layer;

[0113] Note: Nonlinearity is introduced to enable the network to fit complex input-output relationships (such as the nonlinear relationship between water-cement ratio, sand ratio and strength).

[0114] The purpose is to perform a weighted summation of all (m) feature variables in the input layer;

[0115] Let be the connection weights from the (i)th input variable to the (j)th hidden layer neuron;

[0116] Let be: the (i)th input feature variable;

[0117] For: the bias term of the (j)th hidden layer neuron;

[0118] c represents the bias term of the output layer.

[0119] The input variables include cement dosage, water-cement ratio, sand ratio, etc. The system optimizes the mix design by reverse iteration.

[0120] Key parameters such as the water-cement ratio should be further adjusted according to site conditions:

[0121] To ensure the final concrete performance is stable and reliable.

[0122] High-precision automatic metering and feeding: After the proportions are determined, the automatic metering and feeding system sequentially adds each component.

[0123] Powder feeding: The rotating scraper assembly 7 at the bottom of the cement silo 101 operates first to prevent powder blockage; then the pneumatic arch-breaking valve opens, and the material falls into the screw conveyor below, which is then fed into the buffer weighing hopper at a uniform speed under the drive of the variable frequency motor. The weighing hopper adopts a three-point suspension structure, and the mass is fed back in real time by three strain gauge sensors with an accuracy of ±0.1 kg.

[0124] Aggregate feeding: The aggregate first passes through a double-layer vibrating screen 10 to remove oversized impurities, and qualified material falls into the weighing hopper. The screen body is driven by an eccentric vibrator with adjustable frequency to ensure continuous feeding without clogging.

[0125] Liquid component injection: Water and additives are delivered proportionally via a precision metering pump, with the flow rate controlled by a combination of a solenoid valve and a flow meter, with an error of ≤1%.

[0126] The entire feeding process follows the order of "coarse first, then fine, and finally water" to avoid sticking to the wall and scattering.

[0127] High-efficiency mixing and process monitoring: After all components are added to the main mixing drum 11, the dual-shaft forced mixing system is started:

[0128] The two stirring shafts 1101 are driven by a synchronous gearbox. The initial speed is 45 rpm, and after running for 60 seconds, the speed is increased to 60 rpm for high-speed shearing and mixing.

[0129] The stirring arms 1102 are arranged in a spiral staggered pattern, and the ends are equipped with detachable tungsten carbide coated wear-resistant blades to enhance the stirring ability of high viscosity slurry.

[0130] Temperature and humidity sensors are integrated into the inner wall of the cylinder to provide real-time feedback on environmental conditions.

[0131] Simultaneously, the mixing process monitoring and feedback system continuously collects the current and torque signals of the stirring motor. Uniform mixing is determined when the following criteria are met:

[0132] ;

[0133] Otherwise, if the system determines that the consistency is too high or too low, it will automatically add a small amount of water-reducing agent or water and extend the stirring time.

[0134] Automatic unloading and cleaning / maintenance: After mixing, the hydraulically driven sliding unloading gate 12 opens horizontally. The stainless steel sliding plate moves smoothly under the protection of the sealing strip, preventing slurry leakage. After unloading, the control system triggers the cleaning program.

[0135] The pre-set high-pressure water mist nozzle array on the inner wall of the main mixing drum 11 is activated to rinse away residual concrete from all directions;

[0136] Meanwhile, the weighing system is zeroed and calibrated to prepare for the next round of operations.

[0137] All operating parameters, such as proportions, moisture content, mixing time, and energy consumption, are automatically recorded and uploaded to the cloud management platform, supporting quality traceability and model self-learning updates.

[0138] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A concrete mixing device with intelligent proportioning function, characterized in that, include: The raw material storage silo (1) is used to store cement, fine aggregate, coarse aggregate, water and admixtures respectively. Each silo is equipped with an electronic weighing sensor (301) and a controllable discharge valve at the bottom. Real-time detector (2) is used to detect aggregate moisture content, water quality parameters and powder flowability online; The intelligent mix proportion control unit (3) is connected to the real-time detector (2) and the electronic weighing sensor (301) for dynamically calculating the optimal mix proportion based on the detection data and the preset concrete performance target; An automatic metering and feeding system is used to precisely control the amount of each component fed according to the instructions output by the intelligent proportioning control unit (3); The main mixing drum (11) is equipped with a dual-shaft forced mixing mechanism and a speed-adjustable drive motor; The main stirring drum (11) is provided with two parallel stirring shafts (1101), and each stirring shaft (1101) is equipped with multiple sets of stirring arms (1102). The stirring arms (1102) are arranged in a spiral and staggered manner, and the ends are welded with detachable wear-resistant stirring blades (1103). The stirring blade (1103) has a trapezoidal cross-section structure, and the surface is overlaid with a tungsten carbide alloy layer with a thickness of ≥3 mm. It is connected to the stirring arm (1102) by high-strength T-bolts for easy replacement. The two stirring shafts (1101) are driven by a synchronous gearbox to ensure consistent speed and avoid interference; The feed inlet of the main mixing drum (11) is located on the top side, and the discharge door (12) is located at the bottom center. The discharge door (12) is a hydraulically driven sliding plate structure, including a fixed door frame and a stainless steel sliding plate that can move laterally. The sliding plate is provided with elastic sealing strips on both sides, which fit tightly against the door frame when closed. The hydraulic cylinder is equipped with a position sensor, which provides real-time feedback on the opening and closing status to the control unit. It opens after stirring stops and the pressure returns to zero. A mixing process monitoring and feedback system is used to collect torque, current or vibration signals during the mixing process to evaluate the mixing uniformity and feed the data back to the intelligent proportioning control unit (3); a human-machine interface and a remote communicator are used for parameter input, status display and remote data transmission; the aggregate moisture content detector in the real-time detector (2) adopts a microwave transmission sensor, which is installed above the aggregate conveyor belt, with the transmitting end and receiving end symmetrically arranged, and measures the degree of microwave signal attenuation to estimate the moisture content. The calculation formula is as follows: in, The microwave power is for dry aggregate. To measure the transmitted power, These are empirical coefficients determined based on calibration experiments; the system samples every 30 seconds and uses the moving average as the current input. The intelligent proportioning control unit (3) has a built-in proportioning optimization algorithm that outputs a dynamic water-cement ratio. satisfy: in, This is the theoretical water-to-binder ratio. Standard moisture content, This is a moisture content correction factor (0.005~0.015). This is the temperature compensation coefficient (-0.001~0.003 / °C). The ambient temperature (°C) is used to adjust the water consumption and admixture dosage in real time. The automatic metering and feeding system includes a multi-stage buffer weighing hopper (4), a screw conveyor mechanism (5), and a pneumatic arch-breaking mechanism (6) to achieve high-precision, residue-free feeding.

2. A concrete mixing device with intelligent proportioning function according to claim 1, characterized in that, Below the discharge ports of the cement silo (101) and fly ash silo (102) is a conical arch-breaking silo head (103), which integrates a rotating scraper assembly (7). The rotating scraper is driven by a servo motor (701) with a rotation speed of 10~30 rpm, and the scraper blades (702) are spirally distributed. The shaft end of the rotating scraper extends to the outside and is connected to a vibration sensor (703). When a sudden increase in torque is detected that exceeds the threshold, it automatically starts to rotate in the opposite direction and links the pneumatic arch-breaking hammer to perform pulse impact to clear the blockage.

3. A concrete mixing device with intelligent proportioning function according to claim 2, characterized in that, The weighing mechanism in the automatic metering and feeding system adopts a three-point suspension weighing structure. Each weighing hopper is suspended on the support frame by three high-precision strain sensors (8). The sensors are evenly distributed at 120° and are equipped with a horizontal adjustment mechanism and an anti-eccentricity guide rod (9). The weighing sensor has a resolution of 0.1 kg and a nonlinear error of ≤0.05%FS. The signal is transmitted to the intelligent proportioning control unit (3) via a shielded cable for dynamic compensation processing.

4. A concrete mixing device with intelligent proportioning function according to claim 3, characterized in that, Before fine and coarse aggregates are fed into the buffer weighing hopper by a belt conveyor, they pass through a vibrating screening mechanism (10). The vibrating screening mechanism (10) includes upper and lower double-layer screens (1001), with the upper layer having a hole diameter of 37.5 mm and the lower layer having a hole diameter of 4.75 mm. The screen body is driven by a double eccentric shaft vibrator with a vibration frequency of 15~25 Hz, which is used to remove oversized materials and soil lumps. After screening, qualified aggregates fall into the weighing hopper, while unqualified materials are discharged from the side slag discharge port and trigger an alarm.

5. A mixing method for a concrete mixing device with intelligent proportioning function according to any one of claims 1-4, characterized in that, Includes the following steps: S1: Input the target concrete performance parameters, including the design strength grade. slump and the conditions of use; S2: Start the real-time detector (2) to obtain the aggregate moisture content. Water quality indicators and powder condition information; S3: The intelligent proportioning control unit (3) combines measured data with the standard proportioning model and uses a neural network algorithm to analyze and dynamically optimize the proportioning; S4: The automatic metering and feeding system feeds each component in sequence, with the powder being fed at a uniform speed via a screw conveyor controlled by frequency conversion. S5: The main mixing drum (11) starts at an initial speed of 45 rpm, runs for 60 seconds, and then increases to 60 rpm for high-speed shear mixing; S6: The mixing process monitoring system collects stirring torque in real time. ,when and If the mixing is maintained for more than 10 seconds, the mixing is considered complete; otherwise, closed-loop regulation is initiated. In step S6, if an abnormal increase in torque is detected, indicating that the slurry is too viscous, the control system automatically activates the admixture micro-addition pump, adding the admixture in increments. Add high-performance water-reducing agent, among which The value is a proportionality coefficient, ranging from 0.02 to 0.05 g / (N·m). After adding the material, stirring should continue for at least 30 seconds. Meanwhile, the inner wall of the main mixing drum (11) is equipped with an array of high-pressure water mist cleaning nozzles (13), and the cleaning program is automatically started after each unloading. S7: Open the hydraulic slide gate (12), output concrete, and record the entire process data and upload it to the cloud.

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